Natural marble can be used as a high-grade decorative engineering veneer for indoor walls, facings, railings, floors, window sills, services in public buildings such as hotels, exhibition halls, theaters, shopping malls, libraries, airports, stations, etc. The interior of the elevator, the face of the elevator door, etc., is an ideal interior high-grade decorative material. It can also be used to make marble murals, handicrafts, daily necessities, etc. The difference between marble and granite The decorative stone for building decoration and decoration mainly consists of marble and granite. Marble is mainly used indoors, and granite is mainly used for outdoor use. Marble and granite are used for interior and exterior finishes, which are good and durable, but they are expensive, so they are used in projects with high requirements for public buildings and decorative grades. However, in recent years, with the improvement of living standards, people's aesthetic concepts of their living environment are constantly updated, and marble and granite are increasingly appearing in home decoration. Stone is mainly divided into two major categories, artificial and natural. Here, natural marble and natural granite are mainly introduced. Natural marble is a metamorphic rock formed by the high temperature and high pressure of the original rock in the earth's crust. It belongs to medium hard stone and is mainly composed of calcite, limestone, serpentine and dolomite. Its main component is calcium carbonate, accounting for more than 50%. Others include magnesium carbonate, calcium oxide, manganese oxide, and silicon dioxide. Since marble generally contains impurities, and calcium carbonate is exposed to carbon dioxide, carbides, and moisture in the atmosphere, it is also easily weathered and eroded, and the surface quickly loses its luster. Therefore, a small number of relatively stable and durable varieties such as white marble and Ai Yeqing can be used outdoors, and other varieties are not suitable for outdoor use, and are generally only used for interior decorative surfaces. Natural marble can be used as a high-grade decorative engineering veneer for indoor walls, facings, railings, floors, window sills, services in public buildings such as hotels, exhibition halls, theaters, shopping malls, libraries, airports, stations, etc. The interior of the elevator, the face of the elevator door, etc., is an ideal interior high-grade decorative material. It can also be used to make marble murals, handicrafts, daily necessities, etc. Natural granite is igneous rock, also known as acid crystalline plutonic rock. It is the most widely distributed rock in igneous rock. It is a hard stone composed of feldspar, quartz and mica. Its composition is mainly silica, accounting for about 65%. ~75%. The rock is hard and compact, and can be divided into three types: "weijing", "coarse crystal" and "fine crystal" according to its crystal grain size. The quality of granite depends on the mineral composition and structure. Granite with good quality, fine and uniform crystal particles, less mica content and more quartz, and does not contain pyrite. Granite is not easy to weather and deteriorate, and its appearance and color can be maintained for more than 100 years, so it is mostly used for wall foundation and exterior wall finish. Granite is often used in advanced building renovation projects due to its high hardness and wear resistance, for example, the floor of the lobby. Because granite is harder and more acid-resistant than marble, it is more suitable for outdoor balconies, courtyards, guest dining floors and window sills in home decoration. Marble can be used for countertops, counters, and countertops. 1. Granite stone: Granite stone has no colored stripes, most of them only have colored spots, and some are solid colors. The finer the mineral particles, the better, indicating that the structure is tight and strong. 2, marble sheet: marble material mineral composition is simple, easy to process, most of the texture is fine, the mirror effect is better. The disadvantage is that the texture is softer than granite, and it is easily damaged when it is hit by hard and heavy objects, and the light-colored stone is easily contaminated. The marble floor is selected as much as possible, and the striped fabric is better when the table top is selected. Other selection methods can refer to the selection method of granite. Solar cells use sunlight to generate electricity. As long as the sun shines on the battery, it will continue to generate electricity. It is a clean energy with the advantages of safety, reliability, no noise and no consumption of raw materials. It has the advantages of great convenience for residents in remote areas. So what is the working principle of solar energy? Today we'll explore it. Solar cell is a device that directly converts light into electric energy through photochemical effect. When sunlight shines on the semiconductor pn junction, a new hole (electron pair) is formed. Under the action of the electric field, the hole flows from the N region to the p region, and the electron flows from the p region to the N region. After the circuit is connected, a current is formed to convert light energy into electric energy.Solar panel, also known as solar cell module, is a kind of photoelectric semiconductor sheet that uses sunlight to directly generate electricity. It is an assembly composed of several solar cells assembled on a plate in a certain way. It is the core part of the solar power generation system.The earth, the green home for human survival. 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With the development of human civilization, it has gradually become a victim of economic growth. Clean energy is imminent.
The sun concentrates 99.87 percent of the mass of the solar system, and one twenty-two percent of the energy radiates to the earth, becoming the main source of photosynthetic heat on the earth. Solar energy is one of the cleanest, most lasting and most magical energy of all.