The first autonomous CPU-based cloud computing system came out
SD-30 is the first set of China-based cloud computing processing and application system based on Godson-3B1500 processor developed by China Academy of Sciences Chen Guoliang, a member of the Academician of ShenZhen University, with the cooperation of Godson Technology Co., Ltd., which has high density, high energy efficiency and high scalability Features, the combination of hardware and software, virtual machine design and performance optimization and other key technologies reached the leading domestic level. It is learned that the computational virtualization efficiency of SD-30 is considerable - SPECCPU2000 tests show that the computational virtualization efficiency of single, two, and four virtual machines on a single CPU node reaches more than 80%. The Stream Memory Bandwidth Test The results show that the single-node, two-node and four-node virtual machines have more than 85% storage virtualization efficiency. Cai Ye, deputy director of the Center for High Performance, Shenzhen University, said: "Autonomous CPU to do to support the cloud platform, the main difficulty in the virtualization technology, the physical resources into logical resources for easy scheduling management.Virtualization can be divided into two aspects to understand, First, the positive virtualization - a number of physical nodes to form a logical node, Hadoop, cloud storage These Internet applications actually need this. Second is the reverse virtualization - the physical node is divided into a number of logical nodes , And really need to support the CPU level is mainly reverse virtualization, the other is the work of the software ... In order to achieve Godson 3B1500 cloud platform support, Shenzhen University and Godson use a combination of hardware and software, the operating system kernel to do Certainly, the virtualization system HKVM-Loongson based on the domestic Loongson CPU has finally been implemented on the SD-30. The system uses KVM virtualization technology and the OpenStack open source cloud computing software stack, and is built for the first time on more than 40 domestic Loongson clustered servers Massively virtualize nodes and implement effective resource management and scheduling of more than 300 cloud computing virtual nodes. " Furniture edge sealing glue can be divided into three categories according to the different base materials:
HMPU (polyurethane) base material hot melt adhesive, it is a kind of hot melt adhesive with the best performance, and it is the guarantee of high quality sheet edge sealing. It is expensive and requires special usage.
The performance of furniture edge sealant
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EVA (ethylene-vinyl acetate copolymer resin) base material hot melt adhesive, this hot melt adhesive can be divided into two types with filler and without filler. Using EVA as the base material is the most common production technology for furniture edge sealing adhesives, and its main limitation is poor heat resistance. The ambient temperature of panel furniture sealed with EVA hot melt adhesive shall not be higher than 120°C;
POL YAMIDE (polyamide) based hot melt adhesive, this hot melt adhesive has good heat resistance and fast curing characteristics, the main disadvantage is that it is expensive.
1. Viscosity of furniture edge sealant
The viscosity of furniture edge sealing glue does not directly reflect the performance of the glue. In general, the higher the viscosity of the furniture edge sealant, the better its initial tack strength, but the worse the coating performance. Low-viscosity hot melt adhesives have a smaller amount of glue and better wetting properties. Some hot melt adhesives with low viscosity and fast curing speed may also have high initial tack strength.
2. Density of furniture edge sealing glue
The density of furniture edge sealant is generally 0.95-1.6g/cm3, and its density depends on the amount of filler.
3. Softening point and use temperature of furniture edge sealing glue
The softening point is an indicator of the heat resistance of the furniture edge sealant. The higher the softening point, the less likely the furniture edge sealant will melt. At the same time, softening point is also an important aspect to measure the temperature resistance of panel furniture.
4. The opening time of the furniture edge banding glue and the feeding speed of the edge banding machine
Furniture edge sealant is widely used in the market because of its solvent-free, water-resistant, and environmental-friendly features.
