Abstract: A seat plate assembly for fixing a capacitor on a circuit board, including a base plate, a first guard plate, a second guard plate, a third guard plate, a fourth guard plate, a first reinforcing rib and a second reinforcing rib. The first guard plate, the second guard plate, the third guard plate and the fourth guard plate are provided spaced apart on an upper end surface of the base plate in sequence. The first reinforcing rib is configured to connect the first guard plate with the second guard plate. The second reinforcing rib is configured to connect the third guard plate with the fourth guard plate.

Abstract: A seat plate assembly for fixing a capacitor on a circuit board, including a base plate, a first guard plate, a second guard plate, a third guard plate, a fourth guard plate, a first reinforcing rib and a second reinforcing rib. The first guard plate, the second guard plate, the third guard plate and the fourth guard plate are provided spaced apart on an upper end surface of the base plate in sequence. The first reinforcing rib is configured to connect the first guard plate with the second guard plate. The second reinforcing rib is configured to connect the third guard plate with the fourth guard plate.

Abstract: The present invention discloses a directionally modified glucosamine synthase mutant and its application. The amino acid sequence of the glucosamine synthase mutant is as shown in sequence list SEQ ID No. 1, and the nucleotide sequence is as shown in sequence list SEQ ID No. 2. The genetic engineering bacteria of glucosamine synthase is successfully constructed. In order to improve the tolerance of recombinant bacteria against glucosamine, the glucosamine synthase is directionally modified. A glucosamine synthase mutant is selected from the mutant library via high-throughput screening method, the amino acid changes in the mutant induces the spatial conformational change in the enzyme, so as enlarged the region where the enzyme and substrate combines, therefor the combination efficiency of the enzyme and the substrate is increased. The glucosamine synthase of the present invention has various advantages, such as rich in raw material of glucose, and a convenient subsequent extraction.

Abstract: The present invention discloses a directionally modified glucosamine synthase mutant and its application. The amino acid sequence of the glucosamine synthase mutant is as shown in sequence list SEQ ID No. 1, and the nucleotide sequence is as shown in sequence list SEQ ID No. 2. The genetic engineering bacteria of glucosamine synthase is successfully constructed. In order to improve the tolerance of recombinant bacteria against glucosamine, the glucosamine synthase is directionally modified. A glucosamine synthase mutant is selected from the mutant library via high-throughput screening method, the amino acid changes in the mutant induces the spatial conformational change in the enzyme, so as enlarged the region where the enzyme and substrate combines, therefor the combination efficiency of the enzyme and the substrate is increased. The glucosamine synthase of the present invention has various advantages, such as rich in raw material of glucose, and a convenient subsequent extraction.

Abstract: A cracking catalyst, which contains alumina, phosphorus and molecular sieve, with or without clay, wherein said alumina is ?-alumina or a mixture of ?-alumina and ?-alumina and/or ?-alumina, and wherein the catalyst contains, on the basis of the total amount of the catalyst, 0.5-50 wt % of ?-alumina, 0-50 wt % of ?-alumina and/or ?-alumina, 10-70 wt % of molecular sieve, 0-75 wt % of clay, and 0.1-8 wt % of phosphorus, measured as P2O5. The catalyst not only has higher cracking activity and higher cracking ability for cracking heavy oil, but also improves significantly quality and yield of gasoline, LCO and LPG in cracking products.

Abstract: A composite carbon material of negative electrode in lithium ion, which is made of composite graphite, includes a spherical graphite and a cover layer, wherein the cover layer is pyrolytic carbon of organic substance. Inserted transition metal elements are contained between layers of graphite crystal. Preparation of the negative electrode includes the steps of: crushing graphite, shaping to form a spherical shape, purifying treatment, washing, dewatering and drying, dipped in salt solution doped by transition metal in multivalence, mixed with organic matter, covering treatment, and carbonizing treatment or graphitization treatment. The negative electrode provides advantages of reversible specific capacity larger than 350 mAh/g, coulomb efficiency higher than 94% at first cycle, conservation rate for capacity larger than 8-% in 500 times of circulation.

Abstract: A composite carbon material of negative electrode in lithium ion, which is made of composite graphite, includes a spherical graphite and a cover layer, wherein the cover layer is pyrolytic carbon of organic substance. Inserted transition metal elements are contained between layers of graphite crystal. Preparation of the negative electrode includes the steps of: crushing graphite, shaping to form a spherical shape, purifying treatment, washing, dewatering and drying, dipped in salt solution doped by transition metal in multivalence, mixed with organic matter, covering treatment, and carbonizing treatment or graphitization treatment. The negative electrode provides advantages of reversible specific capacity larger than 350 mAh/g, coulomb efficiency higher than 94% at first cycle, conservation rate for capacity larger than 8-% in 500 times of circulation.

Abstract: A cracking catalyst, which contains alumina, phosphorus and molecular sieve, with or without clay, wherein said alumina is ?-alumina or a mixture of ?-alumina and ?-alumina and/or ?-alumina, and wherein the catalyst contains, on the basis of the total amount of the catalyst, 0.5-50 wt % of ?-alumina, 0-50 wt % of ?-alumina and/or ?-alumina, 10-70 wt % of molecular sieve, 0-75 wt % of clay, and 0.1-8 wt % of phosphorus, measured as P2O5. The catalyst not only has higher cracking activity and higher cracking ability for cracking heavy oil, but also improves significantly quality and yield of gasoline, LCO and LPG in cracking products.