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Mat
A mat is a hard or soft floor covering that generally is placed on a floor or other flat surface. Mats serve a range of purposes including: * serving to clean items passed over it, such as a doormat, which removes dirt from the soles of shoes * protecting that which is above the mat, such as a wrestling or gymnastics mat, or an anti-vibration mat * protecting that which is beneath the mat, such as a place mat or the matting used in archival framing and preservation of documents and paintings * providing a regular or flat surface, such as a cushioned computer mousepad Types In domestic settings * In homes or rooms where people sit predominantly on the floor (common in Japan, Korea, India, and formerly China), mats may cover entire rooms, or be used in certain areas for sitting or sleeping. The traditional Japanese style of mat is known as the tatami. Shoes are typically removed before entering these areas to keep out dirt and debris. * A doormat or door-mat is a flat, u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mat (gymnastics)
Mats are used for safety in gymnastics, and in training new skills. They are usually a piece of foam (covered in leather) ranging from 1.5 to 28 inches thick, covered in a vinyl or plastic lining. The foam ranges in density from relatively firm to very soft. Landing mats are usually blue but can be almost any other color. They come in various sizes, from tiny mats used on the beam to vast mats used in the foam pits. Typically, mat use is mandatory in both competition and practice. On every event except floor exercise, pommel horse, and Vault (gymnastics), vault, gymnasts may use an additional landing mat without deduction, which may be adjusted for distance. Types Beam pads These thin mats fasten around the balance beam. They are used only in high-level training to give gymnasts additional protection and a more expansive landing space while working on the apparatus. If necessary, makeshift beam pads can also be constructed from soft mats over the beam surface. Blocks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Welcome Doormat
A welcome is a kind of greeting designed to introduce a person to a new place or situation, and to make them feel at ease. The term can similarly be used to describe the feeling of being accepted on the part of the new person. Overview In some contexts, a welcome is extended to a stranger to an area or a household. "The concept of welcoming the stranger means intentionally building into the interaction those factors that make others feel that they belong, that they matter, and that you want to get to know them". It is also noted, however, that "[i]n many community settings, being welcoming is viewed as in conflict with ensuring safety. Thus, welcoming becomes somewhat self-limited: 'We will be welcoming unless you do something unsafe'". Different cultures have their own traditional forms of welcome, and a variety of different practices can go into an effort to welcome: Indications that visitors are welcome can occur at different levels. For example, a welcome sign, at the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PVC Door Mat
Polyvinyl chloride (alternatively: poly(vinyl chloride), colloquial: vinyl or polyvinyl; abbreviated: PVC) is the world's third-most widely produced synthetic polymer of plastic (after polyethylene and polypropylene). About 40 million tons of PVC are produced each year. PVC comes in rigid (sometimes abbreviated as RPVC) and flexible forms. Rigid PVC is used in construction for pipes, doors and windows. It is also used in making plastic bottles, packaging, and bank or membership cards. Adding plasticizers makes PVC softer and more flexible. It is used in plumbing, electrical cable insulation, flooring, signage, phonograph records, inflatable products, and in rubber substitutes. With cotton or linen, it is used in the production of canvas. Polyvinyl chloride is a white, brittle solid. It is soluble in ketones, chlorinated solvents, dimethylformamide, THF and DMAc. Discovery PVC was synthesized in 1872 by German chemist Eugen Baumann after extended investigation and experim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sport
Sport is a physical activity or game, often Competition, competitive and organization, organized, that maintains or improves physical ability and skills. Sport may provide enjoyment to participants and entertainment to spectators. The number of participants in a particular sport can vary from hundreds of people to a single individual. Sport competitions may use a team or single person format, and may be Open (sport), open, allowing a broad range of participants, or closed, restricting participation to specific groups or those invited. Competitions may allow a "tie" or "draw", in which there is no single winner; others provide tie-breaking methods to ensure there is only one winner. They also may be arranged in a tournament format, producing a champion. Many sports leagues make an annual champion by arranging games in a regular sports season, followed in some cases by playoffs. Sport is generally recognised as system of activities based in physical athleticism or physical de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Structure
A structure is an arrangement and organization of interrelated elements in a material object or system, or the object or system so organized. Material structures include man-made objects such as buildings and machines and natural objects such as biological organisms, minerals and chemicals. Abstract structures include data structures in computer science and musical form. Types of structure include a hierarchy (a cascade of one-to-many relationships), a network featuring many-to-many links, or a lattice featuring connections between components that are neighbors in space. Load-bearing Buildings, aircraft, skeletons, anthills, beaver dams, bridges and salt domes are all examples of load-bearing structures. The results of construction are divided into buildings and non-building structures, and make up the infrastructure of a human society. Built structures are broadly divided by their varying design approaches and standards, into categories including building struct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Square (geometry)
In geometry, a square is a regular quadrilateral. It has four straight sides of equal length and four equal angles. Squares are special cases of rectangles, which have four equal angles, and of rhombuses, which have four equal sides. As with all rectangles, a square's angles are right angles (90 degrees, or /2 radians), making adjacent sides perpendicular. The area of a square is the side length multiplied by itself, and so in algebra, multiplying a number by itself is called squaring. Equal squares can tile the plane edge-to-edge in the square tiling. Square tilings are ubiquitous in tiled floors and walls, graph paper, image pixels, and game boards. Square shapes are also often seen in building floor plans, origami paper, food servings, in graphic design and heraldry, and in instant photos and fine art. The formula for the area of a square forms the basis of the calculation of area and motivates the search for methods for squaring the circle by compass and straightedge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pollution
Pollution is the introduction of contaminants into the natural environment that cause harm. Pollution can take the form of any substance (solid, liquid, or gas) or energy (such as radioactivity, heat, sound, or light). Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Although environmental pollution can be caused by natural events, the word pollution generally implies that the contaminants Human impact on the environment, have a human source, such as manufacturing, Extractivism, extractive industries, poor waste management, transportation or Agricultural pollution, agriculture. Pollution is often classed as point source pollution, point source (coming from a highly concentrated specific site, such as a factory, Environmental effects of mining, mine, construction site), or nonpoint source pollution (coming from a widespread distributed sources, such as microplastics or agricultural runoff). Many sources of po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bacteria
Bacteria (; : bacterium) are ubiquitous, mostly free-living organisms often consisting of one Cell (biology), biological cell. They constitute a large domain (biology), domain of Prokaryote, prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit the air, soil, water, Hot spring, acidic hot springs, radioactive waste, and the deep biosphere of Earth's crust. Bacteria play a vital role in many stages of the nutrient cycle by recycling nutrients and the nitrogen fixation, fixation of nitrogen from the Earth's atmosphere, atmosphere. The nutrient cycle includes the decomposition of cadaver, dead bodies; bacteria are responsible for the putrefaction stage in this process. In the biological communities surrounding hydrothermal vents and cold seeps, extremophile bacteria provide the nutrients needed to sustain life by converting dissolved compounds, suc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clean Room Mat
A sticky mat, also called a tacky mat or cleanroom mat, is a mat with an adhesive surface that is placed at the entrances or exits to certain workplaces to remove contaminants from the bottoms of footwear and wheeled carts such as hand trucks. They are an example of an engineering control within the hierarchy of hazard controls. Overview Sticky mats are typically used in cleanrooms and construction sites. Their purpose is to prevent contaminants from entering the site with personnel, and hazardous materials from exiting. In a cleanroom setting, airborne particles that are not removed by the ventilation system deposit themselves onto a surface, where they can be transported by personnel walking on or past them. Sticky mats can be temporary or permanent. Temporary sticky mats are made of a stack of adhesive plastic film layers that are periodically peeled off and discarded. Permanent mats are made of a polymer, usually polyester- or polyvinyl chloride-based, that binds parti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
