-Поиск по дневнику

Поиск сообщений в nadim221mia

 -Подписка по e-mail

 

 -Статистика

Статистика LiveInternet.ru: показано количество хитов и посетителей
Создан: 02.06.2020
Записей:
Комментариев:
Написано: 2291





Toothbrush - Recommendations On Buying The ideal One

Суббота, 23 Апреля 2022 г. 16:51 + в цитатник

It really is important for people to consume every day because it is required by their physique but when people have a tendency to neglect to brush their teeth after each and every meal which is another story. Food is needed in order for the physique to live but people need to also consider regarding the cleanliness of their body not simply on the inside but in addition on the outdoors. Brushing your very own teeth is one in the critical things to keep a healthy physique mainly because if that is neglected, it is going to develop to a critical dental challenge and often create heart attack as well as other significant health problems. Other people too are brushing their teeth each day however they are not thinking of when it is actually necessary to adjust their toothbrush or tandbørste. It's also vital to alter the toothbrush mainly because there are already bacteria accumulating around the bristles and if kept on use, the bacteria will nonetheless go back for the mouth in which it can develop a lot more plaque on the teeth. Get additional facts about bamboo toothbrush.

 

In case you are out to buy toothbrush or tandbørste but confused on which kind of toothbrush you wish to buy, there are many forms of toothbrushes designed to get a certain age and kind of gums whether they are sensitive or not. There are many sizes, styles and shapes of toothbrush.

 

Most of the experts specifically the dentists advise a toothbrush which has soft bristles mainly because they may be very best in relation to removing residue and plaque with the teeth. Toothbrush or tandbørste with modest heads are recommendable due to the fact they could reach all of the areas of the mouth in particular at the back from the teeth which are difficult to attain with large-head toothbrushes.

 

If you are looking for any form of deal with that may suit you greatest, you can pick any kind you'd like provided that you really feel comfy using it. They are offered in flexible neck or non-slip grip. Similar goes together with the shape of head that are rectangular or tapered, bristles which are flat, trimmed or rippled.

 

Most people favor to work with the electric or battery-powered toothbrush. This really is because it can clean and take away plaque sticking on the teeth better in comparison with ordinary brushes and they're especially useful to people who are disabled or possessing difficulty moving their arms and hands when brushing their teeth.

 

For those who favor to have electric or battery-powered toothbrush, try to remember that it costs greater than the ordinary toothbrush although it really is a reality that it cleans and removes plaque greater than ordinary toothbrush or tandbørste. One electric toothbrush can currently make you invest in several ordinary toothbrushes at the identical cost. In case your choice is the ordinary, standard toothbrush, you'll have to replace them when they are currently worn out or it has already reached 3 months.


Chemical Formula Search

Суббота, 23 Апреля 2022 г. 06:53 + в цитатник

If you're requested to compose it to get an assignment or exam, yet, then you need to write it all down. Transition components have Roman numerals in parentheses to signify that their cost. Originally, its oxidation number is +1; at the merchandise, its oxidation amounts are +2 and 0respectively. It doesn't boost the Hion concentration; it isn't a chemical of H. Can a response be a makeup response and also a redox reaction in precisely the exact same moment? Oxidation numbers are utilized to keep track of electrons from molecules. Table 4.2”Different noodle Launched in Food and Beverages” lists several antioxidants found in foods, either as an additive. Information about different chemical companiesare easily available on the internet.

 

Compose the complete ionic equation for the reaction of FeCl2 and AgNO3. 1 location where solubility is significant is at the tank-type water heater located in several houses in the USA. Domestic water often contains small quantities of dissolved ionic substances, such as calcium carbonate. But, CaCO3 gets the comparatively uncommon property of being soluble in warm water than in cold water. Whilst the water heater works by heating, CaCO3 can precipitate whether there's enough of it from water.

 

The response of an acid with a base to generate a salt. A decomposition reaction generates multiple products from one reactant. Describe the equation for a composition response, a decomposition response, or even neither. Two distinct substances react to create two new materials.

 

Two Kinds Of Chemical Reactions: Single

 

To make it easy, in case you need to reveal Hydrogen, you may use H. In case you need to write the formulation of water that's made of 2 atoms of Hydrogen and one molecule of air, you need to compose it as H2O. This H2 signifies 2 atoms of Hydrogen and thus represents a single molecule of air in the formulation. A compound formula is something similar to a recipe that has different ingredients also makes merchandise. By way of instance, Cocoa Butter, Chocolate Liquor, Sugar, Lecithin, and a flavoring agent create a flavorful item named Chocolate. In the same way, a chemical is made from several components and a component is constructed from atoms.

 

The coefficient is passed, and we all handle it like there are parentheses around the entire molecule. Note too that if no subscript is composed, we presume it to be just one. There are lots of isotopes of carbon dioxide, the most fundamental building block of life on Earth.

 

The mass percentage of a component in a chemical is merely the proportion of the bulk of the component to the bulk of the full formulation unit. Volume fractions are between 0 and 1 but are often expressed as percentages.

 

Chemical Formula Cases

 

The 3 chief motors are powered by responding liquid hydrogen using liquid oxygen to create water. Then you will find the two solid rocket boosters that use a good fuel mixture which has mostly ammonium perchlorate and aluminum. The chemical reaction involving these compounds produces carbon dioxide, nitrogen, water gas, and hydrogen peroxide. A compound formula is an expression that says the amount and kind of atoms within a molecule of a chemical. The number of atoms will be indicated by a subscript after the component symbol. Chemical formulations are just another means to symbolize the number of molecules.

 

In compound formulations, the abbreviations of component names, that can be recorded in the table, are utilized. Inside this type of notation, the endings and also vertices of these pole figures all endure for carbon atoms, which can be bound to every one of the hydrogens the legislation of chemistry can allow. By way of instance, carbon dioxide has just one carbon atom and one oxygen molecule whilst carbon dioxide contains just one carbon atom and two oxygen molecules. All these are confined to one typographic lineup of symbols, which might contain subscripts and superscripts.

 

If a chemical isn't soluble, we utilize the tag to it and assume it will precipitate from the solution. If that is watertight, then no other response is going to be anticipated. Currently, there are just two hydrogen atoms and 2 chlorine atoms on each side of the compound equation, therefore it's balanced.

 

For the abundant isotopic species of dioxygen. This can be handy if writing equations for nuclear reactions, so as to be able to reveal the equilibrium of charge clearly. In any certain chemical substance, the components always blend in precisely the exact same proportion with one another.

 

By way of instance, “H” signifies a single molecule of hydrogen, and also”O” signifies a single molecule of oxygen. If we would like to signify 2 atoms of hydrogen, then rather than writing HH, we compose H2.


Considerations Before Selecting Bearing Seals

Пятница, 22 Апреля 2022 г. 07:56 + в цитатник

That is to say, seals are employed in preventing or reducing any leakage forms from the joints. Since they provide these essential functions, it requires some consideration before choosing the essential seals. Aside from understanding more about the seal, the buyer should find the impact that the seal may have in a variety of environments in addition to knowing the put the seal have to live.

 

When choosing the bearing seals because of its purposeful software, you have to check out the seal's physical measurements and the working requirements. Despite being lots of things to take into account, here are main factors for you to decide on the bearing seals which most fits your requirements. For more details ptfe seals manufacturer

 

Infection

 

Temperature occurs to be the principal element in the seal's environment because it dictates substance of this seal. Bearing seal includes a stated optimum temperature that could vary from 4 - 49 levels. If your working environment occurs to be chilly, then the seal could be brittle, and the weather is warm, then the seal might be more flexible. After the temperature is raised, the rubber aging will likely be higher also. If air temperature may grow by 10 levels, then rubber's existence is going to be decreased by half an hour, which isn't fair. Aside from atmosphere, the environmental temperatures can also differ because of:

 

• The pressure exerted

 

• The speed in the circumference

 

• Thermal management capacities and inadequate lubricating in the lubricant.

 

Size Or Position

 

For you to pick a correct bearing seal, then there ought to be the dimension. The location the seal ought to be placed should be properly measured to be sure the match is ideal. It must always be considered as if there's absolutely no match from the seal, their will not be suppressed significance there may be leakage or contamination. To ascertain the seal dimensions, you want to be aware of the seal , casing hole diameter in which the seal has to be fitted, Inner and Outer diameters of this seal, along with the diameter of the seal that's complete for inner and outer shells.

 

• The seal will signify the gap diameter which the seal has to be fitted.

 

• The outer width of the seal must have its dimension taken nearly 3 areas that are spaced evenly around the seal, and its typical diameter is going to be the outer diameter.

 

• The seal breadth denotes the elevation of seal when it is laid onto the horizontal surface and can be comprised of inner and outer shells.

 

• The interior diameter shaft is utilized when creating inside dimensions because the interior width of the seal can fluctuate.

 

Stress

 

After the strain is too much, the seal may shorten its lifetime by wearing out quicker. The specified peripheral values have to be reduced based upon the strain size; therefore, their stated values will not be continuous. If your environment consists of of high pressure, then you're able to stop the joint leakages along with the home bore once you use the rubber-covered instances seals. There may be some rotational motion dangers at the home bore if the seal has been put under stress, and this may be averted while the seal can be found against the shoulder which gets the spacer ring.

 

Speed

 

For your bearing seals to efficiently function in particular speed state, then they'll be influenced with fever, pressure, seal design, rotating end, and also the fluid lubrication is employed. If the frictional forces are in a greater speed, they can begin climbing hence inducing wearing out. Some brace layouts permit several maximum peripheral levels where; greater peripheral rates are often utilized in bigger shaft diameters when compared with smaller shaft diameters. Where large rates reduce the seal's lifetime, rates from the suggested range can raise the friction; therefore, the seal material is going to be impacted.

 

When choosing the ideal bearing seals, then you need to always think about the above mentioned main factors behind the very best results of your own siding.


What Are the Uses of Oil Seals?

Четверг, 21 Апреля 2022 г. 13:03 + в цитатник

Essential oil closes tend to be also called grime, liquid, or even oil closes. The primary perform of the device would be to near the actual areas between your shifting as well as fixed aspects of any kind of mechanised gear. Closes assist in stopping the actual get away associated with lubricants.

This particular device halts any kind of dangerous pollutants in order to key in the actual equipment especially within severe conditions. This particular device performs an important part for any prosperous automobile procedure as well as correct working of each and every type of device. This assist safeguards a myriad of precision-constructed, roller, sleeve, as well as close-fitting golf ball bearings. Learning more oil seal manufacturer

With regard to accuracy bearings, closes assist in stopping lubricants through operating from the actual bearings or even spilling away inside a particular region. With regard to device elements, this particular device assists within stopping the actual event associated with corrosive dampness, abrasives as well as halts any kind of dangerous pollutants in order to key in the equipment. Closes additionally assist in stopping intermixture associated with 2 types of moderate such as drinking water as well as lubricating essential oil.

Therefore, it is crucial to find the appropriate close off for the device. Finding the right producer or even provider is important to find an exact closing style. You should observe that oil close off should complement towards the aftermarket programs or even unique gear.

This really is to ensure your own device may have a trusted as well as constant overall performance. Essential oil as well as oil closes are utilized within nearly a myriad of machineries which is utilized in variety associated with programs. Closes are utilized within energy tranny, essential oil refineries, off-highway, production, as well as auto programs.

Inside a regular software, grime close off is generally set up next to the actual showing. It's possibly covered within or even covered away because needed through the equipment with respect to the different types of strong, gas, or even fluids which stumbled upon a specific system. Therefore, you should observe that prior to choosing the actual top materials or even closing component, you need to figure out very first the actual working atmosphere from the essential oil close off.

In so doing, you may be certain that you could possess the correct kind of close off for that particular perform as well as or even system. Liquid closes will also be produced from numerous substances as well as supplies. It may possibly be produced through PTFE, tetrafluoro-ethylene propylene, fluoro-elastomer, silicon, polyacrylic or even ethylene-acrylic, polyacrylate, nitrile, urethane, leather-based, as well as experienced substances.

Commercial kind of closes can also be obtainable in different dimensions for example a few tend to be small-bore through absolutely no in order to 13 in .. There's also high-temperature as well as metric types of oil closes. Therefore, you should possess a exact closing style that's coordinated using the unique gear to help you possess a constant, precise as well as dependable procedure.


Oxidized Polyethylene Wax Manufacturer, Ope Wax

Четверг, 21 Апреля 2022 г. 12:56 + в цитатник

The market by utility is segregated into plastic processing, scorching melt adhesive, ink & coating, and others. The ink & coating section holds a major portion of the market due to growing popularity of the product in packaging, corrugated, publication, and others. Moreover, the growing demand for biocompatible, environment friendly natural compound in plastic processing, hot soften adhesive, and different sectors are projected to drive the market in the course of the forecast interval. Oxidized is the quickest-rising section of the polyethylene wax market through the forecast interval. For more details ope wax

 

Purchase a number of tons or kilograms in bulk to keep a manufacturing facility or workshop well provided over an extended time period. As lubricant, its chemical properties are secure and its electrical properties are good. PP course of, lubricant and brightener, improve the plasticization of plastic merchandise improve the toughness and surface smoothness. 5 cable as the cable insulation materials lubricant, can enhance filler diffusion, enhance extrusion fee, growing the mildew move, convenient demoulding. The polyethylene wax market has a diversified and properly-established ecosystem of upstream gamers, similar to uncooked material suppliers and downstream stakeholders, corresponding to producers, distributors, and end customers. BASF , Clariant International , Trecora Resources , Mitsui Chemicals , and Honeywell International , are some of the leading producers and suppliers of polyethylene wax market.

 

The market by the method is sub-divided into polymerization, modification, and thermal cracking segments. The market by software is additional categorized into plastic processing, hot-soften adhesive, ink & coating, and others. BASF , Clariant International , Trecora Resources , Mitsui Chemicals , Marcus Oil and Chemical , and Honeywell International are a number of the key market players in the polyethylene wax market. Companies similar to Lubrizol, Innospec, and Westlake Chemicals are operating in the oxidized polyethylene wax market and particularly within the North America. Additionally, from many years these companies have strong regional foothold based available on the market entry, product portfolio, and distribution channel. The surge within the demand for oxidized polyethylene wax products from sectors similar to rubbers, plastics, and printing inks is estimated to help the market gamers to tap the prevailing alternatives out there.

 

Among the various segments in polyethylene wax market, oxidized polyethylene wax sub-segment is the leading sort used in the market and is anticipated to continue its dominance over the assessment interval. It is extensively used ultimately-use industries as a slip agent, resin modifier, mould release agent, and others. Moreover, its growing consumption in paints & coatings, and others are set to drive the market in the subsequent couple of years. It is projected that the modification segment is set to develop at a major price owing to its boundless use in meals packaging, textiles, and adhesives. Polymerization sub-section is the leading course of utilized available in the market owing to the endless manufacturing of high density and low-density waxes.

 

The oxidized polyethylene has a minimal number common molecular weight of 1,200, as decided by high temperature vapor stress osmometry; contains a maximum of 5 % by weight of complete oxygen; and has an acid value of 9 to 19. This firm could be properly to satisfy our wants on product quantity and delivery time, so we all the time select them when we’ve procurement necessities. The merchandise have been approved by FDA,REACH,ROSH,ISO and other certification, in line with nationwide standards.

 

Oxidised polyethylene wax can replace the products of Mengdan wax, Sichuan wax, liquid paraffin, microcrystalline paraffin, natural paraffin and polyethylene wax, and so forth, and its efficiency is similar to that of the Honeywell A-C wax. Homopolymer polyethylene wax shall be functionalized by oxidation and adds acid and ester to the polyethylene wax. Oxidized polyethylene wax is polar and has different compatibility properties that polyethylene homo polymer. This functionality results emulsification of oxidized polyethylene wax.

 

Stay updated on industry information and developments, product bulletins and the most recent improvements. Manufacturer& distributor of wax additives made of thermoplastics & polyethylene improves circulate, processability, pigment dispersion & mildew release. Used for UV inhibitor, to protect wax from degradation attributable to daylight.


World Market Examine On Polyethylene Wax

Четверг, 21 Апреля 2022 г. 12:38 + в цитатник

Among the various segments in polyethylene wax market, oxidized polyethylene wax sub-phase is the leading sort used out there and is anticipated to continue its dominance over the evaluation interval. It is extensively used in the long run-use industries as a slip agent, resin modifier, mold release agent, and others. Moreover, its rising consumption in paints & coatings, and others are set to drive the market in the subsequent couple of years. It is projected that the modification phase is about to develop at a major fee owing to its boundless use in meals packaging, textiles, and adhesives. Polymerization sub-section is the main process utilized out there owing to the endless manufacturing of high density and low-density waxes. The market by software is segregated into plastic processing, hot melt adhesive, ink & coating, and others. The ink & coating section holds a major portion of the market as a result of rising recognition of the product in packaging, corrugated, publication, and others. Get more details polyethylene wax manufacturers

 

Based on the method, the modification segment is expected to steer the market within the subsequent five years, as a result of growing adoption of the method for HDPE and LDPE waxes. Based on the applications, the ink & coatings section is projected to steer the marketplace for the next 5 years, as a result of like lubricants for PVC processing, dispersing agents for polar masterbatches, surface modifiers in hot-soften adhesives etc. Asia-Pacific is predicted to dominate the Polyethylene Wax market during the forecast interval, as a result of growing demand for Polyethylene Wax from rising economies within the region like China, Japan and India.

 

In the year 2018, the high-density polymerized product is dominating the market with the very best income generation. It is the most most well-liked product sort as a result of its tensile strength and density. Properties similar to low melt viscosity and compatibility with lubricants, plasticizers, and stabilizers enhanced its software in the manufacturing sector. By excessive-density polymerization, LDPE and HDPE are produced, which have applications in hot melt adhesives, polyvinyl chloride processing lubricant, and water-based emulsion components that enhance scratch resistance and friction. The oxidized product phase is expected to show vital progress within the forecasted period. This demand is anticipated largely in the Asia Pacific area because of aggressive industrialization and focus on R&D efforts.

 

Moreover, the rising demand for biocompatible, environment friendly natural compound in plastic processing, sizzling melt adhesive, and different sectors are projected to drive the market in the course of the forecast interval. Global Polyethylene Wax Market is projected to succeed in USD 1.39 Billion by 2023 at a CAGR of over four% owing to the increasing popularity of hot-melt adhesives. Moreover, the rising adoption of HDPE wax among varied end-use industries coupled with rising use within the ink & coatings trade is expected to propel the expansion of the market through the forecast period.

 

The market of PE wax is mainly growing on the account of rising product demand for polyvinyl chloride production. Also, rising demand for polyethylene wax from the coatings and printing inks industries will increase the expansion of the global polyethylene wax market in the course of the forecast period. On the opposite hand, fluctuating prices of crude oil will negatively influence the overall polyethylene wax market as ethylene, the raw materials for polyethylene wax, is derived from crude oil.


Finding The Best Hotel Travel Deal Online

Вторник, 19 Апреля 2022 г. 12:59 + в цитатник

Are you looking for a cheap hotel deal? The best place where you can find cheap hotel deals is internet. The first step is to compare the price and location of the different hotels. A hotel should be selected according to your needs, expectations and desires. The simplest way is to compare the facilities of the available hotels. The most typical amenities that the most respected resort provides tend to be car parking, cafe, meeting corridor, pool as well as perform region with regard to kids.

Creating a resort booking really is easy. Many of the web sites tend to be easy to use and you will very easily guide the resort on the internet. Numerous web sites provide particular research amenities that will help you within narrowing your own research. Lots of people search for last second offers. Numerous resorts reduce their own costs within final min's in order to fill up a few empty areas. To locate a last second offer you need to undergo numerous web sites. This process requires period however can help you save lots of money.

In the event that one is not really within rush he is able to very easily look for a inexpensive resort offer. You are able to conserve lots of money through planning for a journey ahead of time. Numerous resort web sites supply a chance to discount. You are able to quotation your personal cost online. This may be beneficial to locate a total holiday bundle because these kinds of deals. Travel packages consist of almost anything for example resort, atmosphere solution as well as vehicle leasing.
There are lots of web site that primarily concentrate on supplying inexpensive flight tickets as well as resorts. Your work is actually to locate a dependable easy to use web site.


Retiring Telecom techs and Business Phone Repair

Вторник, 19 Апреля 2022 г. 07:39 + в цитатник

Companies like ABS Charlotte also known as “Atlantic Business Systems” also offer traditional 4 line telephones, Business Phone Systems, Small Business Phone systems, and even IP Cameras. We are a leader in North Carolina Telecommunications. We offer more than just a Cloud Telephone System but true office communication systems. We offer both Cloud Telephone Systems as well as Line Telephone systems.

 

We understand one of the biggest investments of businesses is their Business Phone System. What owners of these businesses fail to understand is the importance of a skilled labor force. These traditional phone systems need technicians who can be dispatched to their business to repair their telephone system. In the last few years the sheer age of these skills workers has resulted in mass retirements of telephone technicians. When your Business Phone System fails to function properly or fails completely it is by nature an emergency. The importance of having a skilled profession available truly matters.

 

We understand businesses rely on their Business Phone System to operate on a daily basis, and its critical nature to keep it up and running as well as operating as needed. Our technicians routinely change telephone programming to meet the needs of the business, add additional extensions or change extension users. Then having professionals who truly understand Call Flow and Call management are important as what makes the difference in business efficiency is having a Phone system working properly. So having folks who know how to adjust the system and keep it operating are so critical to maintain that Business Phone System.

 

Thankfully ABS has one of the largest pools of skilled telecommunication technicians available to its client base, but as we approach 2025 we understand we will lose over 40% of our skilled workforce.

 

 It is time we encouraged our younger generations that this is a field that can be both financially and personally rewarding for them. They can proclaim they work on brands like: Avaya Phone Systems, Avaya Repair, and offer Avaya Support, or Lucent Support. We need to offer more training and establish more opportunities to get these skilled jobs filled.

 

ABS is a Telecommunications organization with support in Charlotte, Salisbury SC, High Point, and as far out to Greensboro NC and parts north. Atlantic Business Systems is a leader in Business Phone Repairand support.


How you can Buy a Rowing Machine

Понедельник, 11 Апреля 2022 г. 14:10 + в цитатник

A rowing machine is arguably the ideal full-body workout machine you need to have in your home right now. Anybody can use it and it offers a terrific low-impact cardiovascular exercise so you won't be putting any unnecessary pressure on your joints. And with all the continual pulling and pushing done when rowing, you are going to create and define muscles within your upper and reduced body. Figuring out that acquiring a rowing machine because of the multitude of benefits it is going to supply you could be the simple part. Trying to narrow down which one to get out of your dozens obtainable out there now will be the hard part. To make factors a great deal easier for you, I'll go over the key actions you must follow that should show you the best way to acquire a rowing machine. Get extra details about best rowing machine under $300

 

Step 1 - Figure out for those who have adequate space

 

A typical rowing machine needs exactly the same amount of floor space an average two-seat sofa requires up so be sure to have adequate space. Take into account that your back and head will likely be extended past the length of the seat rail when pulling the deal with so the a lot more space you've accessible the greater.

 

Step 2 - Figure out what your price range is

 

The value range for any rowing machine is ~$125 - $4,200 and there's a great deal to select from so figuring out a budget will naturally narrow down the field. It'll also avoid you from falling in love with a higher-priced rowing machine with in depth attributes you don't need. Making a spending budget is vital but sticking with is key and will end up saving you money.

 

Step 3 - Determine what you plan to use it for

 

Yes, you're going to work with the rower to exercise but there are a handful of issues you'll need to think about:

 

1. Is this for home or commercial use?

 

All machines are prepared for home use, but most usually are not constructed hard adequate to withstand the punishment it would receive at a health club. Make certain in case you intend to purchase a rower for commercial use which you choose one that's commercial-grade.

 

2. Are you an off-season rower planning to make use of this machine to train?

 

The excellent point about rowing machines is that everybody - people of all fitness levels - can use it including off-season rowers. If you are an off-season rower seeking to get a machine to train on, your best bet should be to choose a machine that best simulates the rowing experience you are used to on water for example an air or water resistance rower (I go more than all resistance types in Step 4 under).

 

3. How several people are going to use it?

 

If you're not going to be the only one using it, odds are the other people who're have unique strength and fitness levels. Ensure to choose a machine with adjustable resistance so people of all fitness levels can delight in the rower. Even if the machine is just for you, adjustable resistance is a excellent option because as your strength and fitness level increase, so does the resistance offered by the machine so you won't have to be concerned about "outgrowing" it.

 

Step 4 - Learn concerning the different resistance forms

 

Rowing machines have 4 diverse resistance types and each and every one includes a set of characteristics special to that variety. Learning about each resistance kind will provide you with a better concept about how rowers work and may also assist you to narrow down your search additional if you end up preferring one resistance sort over the other individuals.

 

Here's a short overview of every single resistance kind:

 

Hydraulic Piston

 

Resistance is supplied by hydraulic pistons plus the resistance is normally adjustable meaning people with diverse fitness levels might be able to utilize this machine sort. They usually possess a smaller sized frame, which make it terrific for people who do not have a great deal of exercise space and it really is quiet so it is perfect to use in front in the tv. Out of each of the resistance varieties, this one least resembles the really feel of rowing on water but it is nevertheless a terrific full-body workout machine. They're generally the lowest-priced out of all of the resistance types.

 

Air

 

This really is probably the most prevalent form you see at health clubs/ boathouses. A spinning flywheel is what offers resistance and also the quantity of air that flows in the flywheel creates the resistance. Resistance-level is determined by the intensity in the rowing session so for those who row with extra intensity, the resistance might be more hard; for those who row with less intensity, the resistance might be much less tough. The rowing motion is similar to rowing on water and could be the preferred machine for off-season rowers and athletes. Because it produces wind, the rower tends to make a little of noise and has a longer seat rail, which makes it an incredible machine for taller people. The advantage of your longer seat rail implies it requires up more floor space than a typical rowing machine, which makes it tough to personal when you have restricted space to utilize it in. Their ordinarily priced larger than hydraulic pistons, but significantly less than magnetic and water rowers.

 

Magnetic

 

Resistance is offered by an electromagnetic brake system that creates no friction and is quite quiet. Resistance is normally adjustable and its features are related to an air-resistance rower (longer seat rail, fairly-large footprint, rowing motion that mimics rowing on water) with no the noise, but the rowing motion typically isn't as smooth and the cost is generally higher.

 

Water

 

Paddles suspended in a tank of water produce resistance. Comparable to an air-resistance rower, resistance-level is determined by the user's rowing intensity (row harder/ quicker = additional resistance; row easier/ slower = much less resistance). Moreover, resistance may be additional adjusted by adjusting the amount of water in the water tank; extra water = additional resistance; much less water = significantly less resistance. This resistance-type simulates the rowing motion on water the top. It makes a fair quantity of noise when in use due to the paddles spinning inside the water, however it adds for the general rowing experience for the reason that it really is refreshing and sounds related to truly rowing on the water. The frame is commonly extended along with the unit is heavier than the other resistance varieties due to the water tank. It really is also the most highly-priced so this sort is advised for hard-core rowers or those that want a true-to-life rowing on water experience.

 

Step 5 - Read Reviews of Rowing Machines

 

At this point you ought to possess a superior concept of what you are hunting for. Now, it really is time for you to study reviews of rowing machines you're targeting considering that you might have your budget (and possibly preferred resistance-type) already determined. Getting a spending budget and also other preferences in thoughts ahead of you start off reading reviews will save you a lot of time because you won't be wasting any on machines you happen to be not serious about. A fantastic rowing machine review site will go over all the particulars of every single machine including resistance sort, an overview of the fitness monitor, build top quality, comfort, storage options, user capacity limits, assembly and warranty details, benefits and drawbacks, and most importantly will let you know what owners from the machines need to say concerning the rower.

 

Buying a rowing machine is not an easy task but in case you follow these 5 actions, it's going to not merely save you time but money as well.


Tips on Choosing the Best Rowing Machine Under $1000

Понедельник, 11 Апреля 2022 г. 14:03 + в цитатник

What exactly to look out for in the best rowing machines? There are some features that most users recommend when looking for the right rowing machines. These include getting a good warranty, ergonomic handle grips and easy maintenance. While these are not always the first features that come to mind when buying a rower, they are definitely important to consider. These tips will help you find the ideal rower to improve your workout.

 

Rowing machines can vary greatly in price, depending on how many features they have. It's important to consider what you need when looking at the rower. This will help narrow down the selection and make it easier to decide on the right model. If you need only basic features, you will want to choose a machine with basic features such as resistance and tension settings.

 

The warranty is another important factor to consider when buying a rowing machine. A good warranty is a sign of quality. A warranty allows you to return the product if it isn't working for you. However, you need to consider the type of warranty offered, which may vary from brand to brand. Some warranties will be standard while others will cost more. The same rule applies to buying used rowers. The more expensive models have more expensive warranties.

 

The ergonomic grip and easy maintenance features are also key to a good rowing machine. These features will give you the maximum benefits from using a rower. These two factors should also be considered when choosing a machine. Many users don't bother to buy a quality rower, but it is important to pay attention to these details. While the price may be high, you can be sure that you will get good value from a good rower if it is well-made.

 

Best rowing machine under $1000machines have been around for hundreds of years, so it's important to think about what was originally used for exercise when rowing. You should consider what features were important for the first time rowing machines and see if those features are important to you when buying a new rower. The best rowers will have all the features needed to give you the benefits of regular exercise without the hassle of adjusting resistance.

 

Hopefully, the above tips will help you find the ideal rower. Once you've found the right rower, you will never want to go back to your old set!


Before You Use Your Jump Rope

Понедельник, 11 Апреля 2022 г. 13:51 + в цитатник

Rope jumping, one of the most exciting means of boxing. I remember when I saw my first Rocky movie, when I saw Sylvester Stallone turn the rope so fast that you couldn't even see him, "a wonderful man."

 

His style and grace were perfect, but there was one thing that Rocky was wrong.

 

He jumped in his boxing shoes. Now it may seem like a good TV, but I've found the hard way, as what feels good in Hollywood doesn't always work in the real world. Because if you're jumping a rope in boxing shoes or any other shoe that doesn't have the right foot, your lower leg hurts, you know the next day.

 

When I first started bungee jumping, I tried some running shoes (I love these Nike Air Max boots). They were great for running because they added support and cushioning to your heel, but when you climbed the rope, they didn't do anything because they didn't contain a big cushion for your front leg.

 

The best shoes you can find for bungee jumping are cross-training shoes and basketball shoes.

 

You see that when jumping on a rope, best shoes for jumping ropeall your body weight is focused on the balls of your feet. These shoes provide adequate padding and support in this area to absorb vibration forces and keep your calf.

 

Before jumping on the rope, make sure you are wearing the right shoes and your cane will thank you.

 

This exercise is the biggest calorie burner. It can improve speed, coordination, balance and agility. You can include this training in warming up and maintaining your heart rate. Heat slowly with a set of 2 to 3 minutes and then increase the duration and intensity. You can lose weight by exercising with a rope by eating fewer foods that contain calories. But it should be densely nutritious in all foods and foods such as fruits, grains, vegetables, lean proteins and dairy products. This ensures that the working muscles receive the required amount of energy.

 

Of all the fitness options, the jump rope is one of the highest costs. Even a high quality fitness jump rope is only $ 20. However, you can get a bigger rope for $ 3. The rope must be suitable and of good quality. It is usually made of nylon, cotton, PVC, plastic beads or leather line. And depending on the surface area you get a rope. The weighted jump rope is the best rope springboard for training. The weight on the handle gives you an extra upper body workout.

 

You can exercise anywhere, such as on the beach, on boats, on mountain peaks and even in the dark. To stay in the hobbit hole, you can search for the jump rope area. Before jumping you need to know the basic requirements for rope jumping exercises. Adjust by lifting the rope and holding the rope. Competitors should differentiate this from high-end footwear and choose the cross-training shoes that should be suitable. The surface area is important for exercise. You should not jump on grass, concrete, carpet or asphalt. Your shoes may become clogged and your knee or ankle may stretch. Use a piece of plywood, laminate flooring or an exercise mat.


Buy Best Punching Bags For Apartments From Online Store

Понедельник, 11 Апреля 2022 г. 13:44 + в цитатник

Boxing and punching are an extraordinary type of cardio exercise that can assist you with building quality and perseverance. What's more, there are tons of punching gears that you can get on the off chance that you are not kidding into doing this exercise movement. The most noticeable and utilized is the punching sack. For those living in elevated structures, finding the privilege of punching a sack can be very troublesome. Space is an extravagance for those living in condos and not all that numerous individuals can have committed space for setting up a punching pack.

 

The main thing is that if you are a person who is going to use the punching bags at home then it will develop your technique and increase your power, also if you will throw the power packs on bags then you can easily develop your upper part of the body. It will take some time to develop the body but if a person is going with the flow and regularly they are going to practice on bags then it will surely give the result. There are various people who are going for a number of exercises but it is found that this is one of the best exercises which will increase stamina and also it will give the body a strength to develop. There are various online portals available from which you can order the best punching bags for apartment and they will deliver it to your location in no time. It would be always a good thing to check the quality and service of punching bags so that it can give you service for a long time.

 

There are a number of benefits available of punching bags such as self-defense, if a person practices properly then it would give a boost on their confidence so that a person can handle all the things properly and can defend themselves in any kind of circumstances. There are various punching bags available across the world and it depends upon you which types of bags are good for you. Some of the bags are very heavy in weight and some are free-standing bags and some are doorways, whereas a doorway which a person can use in a small place while others can be used in various places. The main thing is that you have to select the proper punching bags as per your space, also you need to choose the proper fabric and durability option so thatt it can last for a long time, it would be always a good thing that a genuine leather bag will last for a long time and people can take the advantage of such things for a long time. There are various online portals available from which you can book the best punching bags at affordable rates and they will deliver it at your location in no time. It would be strongly recommended that you have to choose the bags which are noise proof so that it will not disturb the neighbor. Some of the best punching bags for apartmentare Century WaveMaster PowerlineFreestanding Punching Bags, RDX Punching Bag Set, Everlast PowerCore Bag, Everlast OmniStrike Heavy Bag, Ringside Freestanding Punching Bag.


Multi Gym Equipment - How to Choose a System

Понедельник, 11 Апреля 2022 г. 13:35 + в цитатник

Some multi gym equipment is expensive costing thousands of dollars. You need therefore to consider carefully what is the best equipment and will you get value for money from your investment.

 

Multi gym equipment should give you results in your home which are as good as, or better than, taking time going to the gym. To test its effectiveness the following questions.

 

Is it possible for me to weight train on my gym? If you cannot weight train on your own in your multi gym equipment to concentrate and pace yourself, perhaps you need some additional equipment, or consider some visits to the gym also.

 

Can I achieve the body I desire with my gym? In the local gym you can compare from one time to another how you body has changed. Have you gained muscle mass? and where the gain was quickest? Your multi gym equipment will be effective if you think you can maintain or improve your performance in the same length time. Beginners who workout with a home gym will also like to measure their performance against a starting measurement.

 

Will I increase strength? If you have improved strength after a period of days or weeks training at home, especially to those whose goal is increased strength, then multi gym equipment choice was good.

 

Is your home gym safe to use? Safety is an important consideration in choosing multi gym equipment. If you are injured when training you need to check the equipment and ensure your are using it properly. However consider whether you need to redesign or reconstruct the equipment if the injuries persist. More here best medicine balls for slamming

 

Can you follow a training program when an instructor is not present? A training instructor, a group of people to train with, each of these are great motivators to completing each days routine. Without the camaraderie many can find difficulty in sticking to a program although there are strategies to help you.

 

Whilst the more expensive equipment is more effective, do not loose sight of the aim is saving money. However spending a few dollars extra can get more effective equipment for you and you may wish to do this.


The details to read about compact home gym equipment

Понедельник, 11 Апреля 2022 г. 12:43 + в цитатник

With such a huge number of fitness answers for peruse, you may feel that its hard when envisioning setting up the best home gym. In actuality, various individuals will all in all lose trust even before they start. Clearly, this looks good considering there are such enormous numbers of things you need to choose. Would it be a good thought for you to get the best treadmill machine for walking? Or then again maybe the best indoor cycling bike will serve you perfectly? To make your main goal easier, here are two huge requests to posture to yourself before buying home gym equipment.

 

Your fitness goals should be the coordinating factor when buying the best equipment for your home gym. Along these lines, start by understanding what you have to achieve with the exercise after which you can investigate the particular equipment options available at your disposal. At no time will you find'one size fits all' best weightlifting shoes paying little heed to how hard you endeavor. The secret lies in picking fitness tools reliant on the current period of your trip. There is no need of buying the best leg press machines yet you've never gotten the chance to do leg exercises before.

 

Everybody has their own game plan of goals, limitations and tendencies with respect to fitness. For this clarification, you need to consider whatever other person who will use your home gym before sprinkling the money on new equipment. The good news is some gym equipment options allow for various customer profiles and tendencies. Among the most notable cardio options that allow a wide extent of workouts fuse cross mentors and elliptical. You can, therefore opt for the best elliptical machines under $500. Recollect about home exercise equipment for seniors if you happen to have one.

 

These are just anyway a segment of the requests you need to posture to yourself before setting up your home gym. Never rush into buying the best rowing machines or the best squat rack basically considering the way that your buddy or accomplice has one. Most by far who do this breeze up bemoaning their decision later on especially in case they don't use the home equipment purchased. Thusly, act yourself anyway numerous requests like could be normal under the conditions after which you can go out to shop. It is at precisely that point that you'll set up the compact home gym you've been aching for this while.


Buy Gym Equipment Online

Понедельник, 11 Апреля 2022 г. 12:32 + в цитатник

The outlook of the whole world has undergone a transformation. Now almost everybody living on this planet wants to look fit and pleasing. Thanks to the service of buy gym equipment online, getting in shape is now very easy.

 

Quite obviously, if a person wants to have a good physique, assistance of gym equipment is indispensable. Such needs however, differ from person to person. So while one person may feel the need to buy a lot of gym tools, another person may require only a handful of them all.

 

The concept of Gymnasium workout is not very old. Earlier people either worked their sweat off jogging, brisk walking or they indulged in any similar kind of exercises. Yes, these kind of natural exercises are a must to the body; they are just not sufficient to build up a body or better put tone up a body. The desired curves and abs can be gotten with the help of gymnasium equipment only!

 

Owing to the fast pace of modern life, people are, in fact struggling for time to devote to their bodies. The life seems to be full to the brim and there seems absolutely no way to spare out some time for one's own body! This is where the need to buy gym equipment arises. Ownership bestows the facility to use the equipment anytime, anywhere!

 

People having access to basic gym equipment can proceed with the exercising part in the luxury of their own home. They are, thus, not time bound. They may start with the exercising without having to think about anything! Experts suggest that in order to live a normal healthy life a person should exercise for about 30 minutes daily say three to five times a week. One should be consistent with one's exercising regime. Unpunctuality makes it difficult for the body to adapt to the regime. Exercising, it is believed, makes a person not only healthy but also happy. A person who indulges in routine exercising leads a relatively happy and prosperous life. Keeping the body in good health thus, is of the utmost importance. There are many people who are least concerned about exercising. They may not realise it now but sometime down the line they will sure understand how important it is to keep the body in shape. Also, rather than spending a bomb in the gymnasium, one may get hold of some gym equipment.

 

So, if one wants to live a disease-free and on the whole a pretty healthy life, one should seriously consider the idea of purchasing some gymnasium equipment. A person can get all these health tools from buy gym equipment online stores. With the facilities offered by buy gym equipment online, gym equipment can be purchased at very low prices. A person thus, may buy quality health tools at much cheaper rates from most of the buy fitness equipment online stores.

 

Unlike conventional gym stores, online gym store offer a wide array of gym equipment and that too at a pretty reasonable price. There is an extensive range of online exercise equipment for the prospective user to choose from. More here compact home gym

 

A major advantage of getting things from the buy gym equipment online is that of buying things without leaving the comfort zone. A person thus can easily have things just by clicking the button of computer mouse. Internet has made things so easy. Hasn't it?


Best Rowing Machines

Понедельник, 11 Апреля 2022 г. 12:16 + в цитатник

Various people are by and by buying home fitness equipment to improve their physical fitness while at home. This may not come as a wonder to many thinking about working out at home isn't simply helpful yet what's more less over the top. Regardless, before visiting the games store and getting the best home gym equipment, you need to understand some underlying factors. Taking everything into account, you have to get good value for your money in the wake of placing assets into the best elliptical under $1000 or some other home fitness equipment. Here are presumably the most notable things you need to acknowledge when buying best rowing machines.

 

It is fundamental for homeowners to figure they will get more satisfaction from equipment basically considering the way that they finished on premium expenses. What they disregard to recognize is that you can finish on unquestionably more than the market cost at this point simultaneously get equipment that is of low quality. Make sure to check the idea of equipment before making the fundamental portions. You can buy the best elliptical machines under $300 or go with more affordable other options. This doesn't mean you should forfeit on equipment quality just in light of the fact that you have to set aside some money.

 

In every industry, there are stores that will reliably stand separated from the rest. Things are the equivalent concerning the fitness world since stores don't guarantee buyer dedication. Purchasing the best knee brace for working out from a reputable store won't simply promise you get good value for your money yet furthermore achieve your fitness goals. What is altogether all the all the more fascinating is the way that you may end up getting after arrangement organizations while relying upon reputable stores. This is obviously going to save you a lot of money in the long.

 

Just considering the way that you need a compact home gym, it doesn't mean you should buy equipment aimlessly. Doing this may end up costing you big time especially when you disregard to buy the best adjustable dumbbells or best spin bikes. You should therefore do a quick and dirty research and examine what each store brings to the table. It is at precisely that point that you have the perfect potential for achievement of buying the best casein protein powders without encountering a lot. Make an effort not to abstain from searching for the help of your allies or partners if things are not working out for you.


Time To Find The Best Rowing Machines

Понедельник, 11 Апреля 2022 г. 12:09 + в цитатник

When envisioning buying the best home gym equipment, there are a number of things you need to audit. This action is aimed at promising you have a compact home gym for you and your family. Dismissing the route that there are such a gigantic number of things you ought to consider, some should never miss in your list. Considering, you should be have conviction that you are getting the best bow flex exceed home gym or some other equipment of choice. To stop the long story, here are points you need to evaluate before shopping for the best casein protein powders.

 

As an issue of first criticalness, you should figure out the amount of money you are glad to spend in home gym. Overview its absolutely unthinkable you are going to buy the best leg extension machine or best treadmill machine for walking yet it is route over your set budget. By having a budget in place, you will have the choice to shop for the equipment you can afford without focusing on finding yourself in a financial crisis. Right when you have developed a budget for home gym, you will wind up being powerfully familiar with what is available to you.

 

Near the budget, you should in like route factor in the available space in your home. Desert buying home gym when you don't have space for it. A titanic number individuals who do this are never going to welcome the benefits accomplished by home gym considering they can't use it. Along these lines, before you spend your legitimized money in the best indoor cycling bike, you ought to be sure that there is satisfactory space to keep it. Through this action, you won't have to pressure dropping the indoor cycling bike since it will be intentionally positioned in your home.

 

We can never close without referencing the substance of determining your goals before purchasing home gym. This will mean inquisitive concerning why you need the home gym regardless. Things should not stop there since you ought to correspondingly ask concerning whether there is some remarkable fitness equipment that will help you in meeting your goals. It is what's constantly major to examine smith machine vs. squat rack vs. power rack or the division that exists between any home gym equipment you need. It is at legitimately that point that you will without a powerlessness get good value for your money.

 

For more details best workout bench


Mistakes you’re Making When Buying Used Fitness Equipment

Понедельник, 11 Апреля 2022 г. 11:49 + в цитатник

Having the best home gym sounds like a really attractive option especially when you want to maintain your fitness but cannot make it to your local gym. For many, starting a home gym can seem like a daunting task when you examine the different options available at your disposal together with the high price tags. However, lack of finances should never be the underlying reason why you cannot buy the best medicine balls for slamming. This is because you can now lay your hands on used fitness equipment thus saving a lot of money.

 

Whether you are searching for the best power rackor the best upright exercise bike for short persons, there are ways to ensure your used equipment does not coat rack within the year. If you are in the market for used fitness equipment, here are some mistakes to avoid at all costs.

 

Failing to Ask Enough Questions

 

Even though it might seem nerve-wracking to ensure you are asking all the questions you want, at no time should you skimp on this. Actually, it is always better to ask the right question even when you happen to get a face-value and believe it is the truth. Do you offer financing options? How often did you perform maintenance on the machine? Be sure to ask as many questions as possible if you are to stand the chance of buying the best rowing machines.

 

Not Knowing the Actual Condition of the Equipment

 

Let us face it, any piece of equipment will look appealing and attractive after a good clean,  but this does not imply it won’t break on after a few uses. If you are planning to buy the best squat rack, do not hesitate to try it before making the necessary payments. For those who are purchasing the fitness equipment from a home, it would be better to look around and check whether there are any pets around. Keep in mind pet hair may clog up parts of the machine thus affecting the performance.

 

Buying used equipment does not necessarily have to be stressful. In fact, it is one of the best ways to start your home gym without worrying about digging deeper into your pockets. So the next time you are searching for the best workout bench for your home gym, consider getting one that has been used before to save money.


Know about the best home ab machine

Понедельник, 11 Апреля 2022 г. 11:31 + в цитатник

Is it genuine that you are envisioning having the best home gym? Accepting this is the situation, by then you ought to be totally aware of the differing equipment that you'll have to invest your money in for you to finally get the compact home gym you need. Fortunately, there are a tremendous extent of different kinds of exercise equipment out there to pick. This might be a shockingly sure improvement for some thinking of you as need to pick what you need before making the choice to purchase any equipment. Here are the absolute most notable kinds of equipment that should never miss in your home gym.

 

If your rule desire is growing your fitness levels and lung limit while at the same time reinforcing your cardiovascular muscles, by then you'll have to invest in cardio exercise machines. This action will go far in guaranteeing you feel less engaged, and acknowledge extended imperativeness levels.

 

There are so various cardio exercise machines you can recall for your home gym. For instance, you may pick the best treadmill machine for walking, schwinn 130 vs 170 upright bike, or even the best upright exercise bike for short persons. You should, however, recall these machines will all in all consume the most room in your home and don't come at an expendable expense. This doesn't mean you can't get the best elliptical machines under $300.

 

One of the most standard forms of exercise and an unquestionable prerequisite have in any compact home gym are free weights. Notwithstanding the way that lifting weights fabricates and fortifies particular muscle social events, free weights help you in working on express zones of your body. Recall free weights don't assemble fitness levels likewise as cardio exercises. Regardless, make sure to invest in the best kettlebells, or the best medicine balls for slamming.

 

Having the best home gymdoesn't mean spending more than you can afford. Or maybe, understand your necessities and fitness destinations before taking off to buy the best leg press machines or an indoor cycling bike. The puzzle lies in starting with the essentials after which you can progress up bit by bit. This is whether you're meaning to have you own gym or invest in home exercise equipment for seniors.


Dyson V8 Vs V10: Which One Is The Best?

Пятница, 01 Апреля 2022 г. 19:18 + в цитатник

Seeking for the best vacuum cleaner, but confused in between Dyson V8 and V10? Not to worry as this post will help in solving your issues. Here is the brief comparison review will help you to know more about the features, pros and cons and everything else to push you to buy right vacuum cleaner for your home.

 

Starting from Dyson V8 suction, its regular suction mode is perfect for routine carpet cleaning will help people to enjoy while cleaning and without leaving any gibberish behind. It has got the max suction mode, which is excellent for high-traffic areas, but it doesn’t go as deep as the V10’s max mode. V8 comes up with two suction settings: regular and max, where one can use the direct drive cleaner head on carpets and the regular suction in most situations. It provides extra power for high traffic areas, where the high suction setting has 115 Airwatts and will go deep.

 

In Dyson V8 vs v10, talking about the V10’s suction mode, it is called to be having low suction mode, which is 16 Airwatts and isn’t sufficient for carpets. The regular suction mode is 34 Airwatts, which is more powerful than the V8’s regular mode and perfect for routine cleaning. This machine will go deeper on carpets as compared to the V8’s max mode too and has got three suction modes: low, regular, and max. This machine’s regular mode gets deeper than the V8’s regular mode and its maximum suction power is 151 Airwatts of suction is better compared to the V8’s. It’s so powerful that it can compete with some corded models. Coming to the runtime section, Dyson V8 will help people to go with 34 minutes of runtime with the regular suction mode and it has direct drive roller attached. In high traffic areas, one can switch to the maximum mode for 8 minutes with huge suction power. Also know that it has a 2800 mAh battery and has great motorized tools, where the regular suction gets 34 minutes with 8 minutes in max mode. The battery has a 3.5-hour recharge time.

 

V10 here comes up with a 60-minute runtime with its 2300mAh battery, which is quite good in compare than V8 due to low power where no tools are attached. You need motorized tools to do most things where the low suction mode gets 45 minutes, regular suction will run for 27 minutes, max gets 7 minutes. For great cleaning, one must go with regular suction power on carpets and it has a 3.5 hour recharge time.

 

Apart from this, V10 looks stunning and futuristic, which is easy to use and can help people with deep cleaning easily. Also, it weighs about 3.7 pounds and works the best when using it as a handheld. V8 weighs about 3.5 pounds and it can hold 530 ml of dry material as well as one doesn’t need to get their hands dirty. Just pull the tab and dust comes out. For more help one can check the suggested source and get authentic reviews for making right decision.



Поиск сообщений в nadim221mia
Страницы: 114 ... 60 59 [58] 57 56 ..
.. 1 Календарь