R-value (insulation) as ASHRAE 90.1 and the IECC prescribe U-values. However, R-value is widely used in practice to describe the thermal resistance of insulation products, layers, and most other parts of the building enclosure (walls, floors, roofs). Other areas of the world more commonly use U-value/U-factor for elements of the entire building enclosure including windows, doors, walls, roof, and ground slabs. The SI (metric) unit of R-value is whereas the I-P (inch-pound) unit is For R-values there is no difference between US customary units and imperial units, so the same I-P unit is used in both. Some sources use ″RSI″ when referring
Advanced materials industry in China and National Basic Research Program (973 Program)). Advanced materials industry in China As an important part of the national sustainable development strategy, the development of advanced materials is advancing the competitive nature and state of the art for Chinese industry. The State has put advanced materials high on its development agenda for the next decade and listed it among the key high-tech industry sectors that would be given priority for development by the State Council. At present, the pace of building China's advanced materials industry is accelerating. Advanced materials have been key fields in China's national R&D system (National High