缬氨酸消旋新工艺

缬氨酸消旋新工艺;缬氨酸;二苯甲酰L-酒石酸;消旋     

Synthesis and Crystal Structure of（Z）-2-Methyl-5,6-dihydrobenzo[d]thiazol-7（4H）-one O-Prop-2-yn-1-yl Oxime Derivatives

Compound(Z)-2-methyl-5,6-dihydrobenzo[d]thiazol-7(4H)-one O-prop-2-yn-1-yl oxime, C11H12N2 OS, as a synthetic precursor of cytotoxic triazoles has been prepared and characterized by NMR spectra. Meanwhile, the crystal of IV was obtained and determined by X-ray single-crystal diffraction. Crystal data: monoclinic system, space group P21/c, a = 9.725(9), b = 8.068(7), c = 14.452(13)A, β = 98.68(2)°, V = 1120.9(17)A3, Z = 4, F(000) = 464, Dc = 1.305 g/cm3, μ = 0.263 mm-1, R = 0.0457 and w R = 0.1298 for 11511 independent reflections(Rint = 0.0709) and 2289 observed ones(I 2σ(I)).     

一种同步流水线SRAM读写控制模型

设计了一种同步流水线静态随机存储器读写控制系统的行为级模型。分析了存储器芯片的控制信号和工作时序要求,利用Verilog硬件描述语言对存储器芯片的读写系统进行了行为级建模。系统包括主机、总控制器和存储器三部分,其中总控制器又包括信号源发生器和数据收发控制器两个子模块。利用Modelsim软件对系统行为级模型进行了仿真验证,结果表明系统控制模型在非猝发(常规)、线性猝发、交织猝发三种工作模式下均可对存储器进行正确读写操作。该模型将主机端源控制信号数量减至最少,极大简化了读写控制流程;采用系统时钟双沿对数据采样传输,提升了系统的稳定性。