tecnologia zheng zheng li

                                Electricity an electronic circuits Germanium is a chemical element with the Symbol(ge) and with the atomic number 32.And are use in electronics,Also they are use in Solar Panels or fluorescent lamps. Silicon is a chemical element with the symbol (si) and with the atomic number 14.Is use for in electronics,to produce silicon waver used in the semiconductor Industry. Silicon was discovered in 1823 The existence of germanium was predicted by Russian chemist Dmitri Mendeleev in 1869 but in   1885, Clemens Winkler, a German chemist, discovered what was then referred to as "eka-silicon" in an ore known as argyrodite. The ore contained silver, sulfur, iron oxide, and zinc with about 7 percent of the unknown metal. silicon is present in the sun and  meteorites.  Silicon  makes up one quarter of the earth's crust. It is the second most abundant elevment on Earth, behind only oxygen.  Silicon  is not found free in nature, bu

            Product Life Cycle Assessment and                         the Environmental Impact  RAW MATERIIAL EXTRACTION: FIRSTLY WE EXTRACT IN THE NATURE RAW MATERIALS FOR THE PRODUCT THAT WE WANT TO CREATE ,IS THE FIRST STEP IN THE CYCLE. MATERIAL PROCESSING: USED IN THE MANUFACTURE OF RAW MATERIALS UNTO FINISHED GOODS.THE OPERATIONS INVOLVE A SUCCESSION OF INDUSTRIAL PROCESSES WITH VARIOUS MECHANICLA OR CHEMICLA PRODEUCERES,USUALLY PRODEDURES ,USUALLY PRODUCED IN LARGE QUANTITIES.  MANUFACTURING:   IS THE PRODUCTION OF PRODUCTS FOR USED OR SALE USING LABOR ,MACHINES,TOOLS... WE TAKE THE RAW MATERIAL AND WE PU TON IN THE FACTORY TO MAKE THE PRODUCT .THIS PROCESS IS CALL MATERIAL PROCESSING ASSEMBLY: WE PACKED THE PRODUCTS AND SET THE PIECES ,FRAGMENTS OR ELEMENTS,READY TO SALE. PRODUCT USE: THEN WE BUY THE PRODUCT IN SHOPS AND THEN WE  USED THE PRODUCT . DISPOSAL: FINALLLY WE RECYCLE THE PROD

                                             PLASTICS                   Plastics are materials formed by chains of carbon and hydrogen atoms. We call these chains polymers, while the atoms that form them are called monomers. There are three different types of plastics:    1 THERMOPLASTICS                                         Thermoplastics are defined as polymers that can be melted and recast almost indefinitely. They are molten when heated and harden upon cooling. One of thermpoplastic  characteristics is :  they are reversible, so the material can be reheated, reshaped, and frozen repeatedly.  As a result, thermoplastics are mechanically recyclable. Some of the most common types of thermoplastic are polypropylene, polyethylene, polyvinylchloride, polystyrene, polyethylenetheraphthalate and polycarbonate.      PE :Polyethylene is a thermoplastic polymer with variable crystalline structure and an extremely large range of applications depending on the pa

       Plastics. 3D design and printing   🌸                                                                                                         exercise 1 and 2  1 car tyres are made of 19 percent natural rubber and 24 percent synthetic rubber wich is a plastic polymer .                                                                  2 The ink tube and cap of the pen are made of polypropylene, a slightly more environmentally friendly plastic that can be recycled. It is chosen for its durability and impact resistance. While Polystyrene is prone to brittle cracking, the PP cap can prevent it from breaking when dropped or impacted.  3  Melamine-Formaldehye (MF)is one of the components that we  made   by reacting these two constituents, is widely used today for electrical socket as  and recepticals.     - Prices: 1  But as with prices for other types of 3d printing materials, it highly depends on the quality of the material, the type of the material and the manufactur