异构云DCN中绿色虚拟算法设计

为进一步提升异构云数据中心网络(DCN)动态管理的科学性,在总结当前主流研究局限性的基础上构思一种基于全局相对最优化的绿色虚拟算法.算法综合考虑虚拟机迁移过程中可能涉及到的诸多客观因素,通过科学地规划时间门限、主机筛选策略、以及精度比较机制对虚拟机实施高效的迁移.数据考察表明,所部署的算法不仅可快速精确地物色到最适宜的...     

高效液相色谱法测定化妆品中4种禁用醛酮化合物

建立了同时测定化妆品中4种禁用醛酮化合物(巴豆醛、苯乙酮、2,4-二羟基-3-甲基苯甲醛和2-亚戊基环己酮)的高效液相色谱(HPLC)分析方法。样品使用50%乙腈(体积比)溶液提取,经AQ-C18(4.6 mm×150 mm,5μm)色谱柱分离后,高效液相色谱/二极管阵列检测器检测,以保留时间和紫外吸收光谱定性,外标法定量,高效液相色谱-质谱/质谱法确证。结果表明,4种醛酮化合物在0.05~2.0 mg/L质量浓度范围内呈良好的线性关系,相关系数均不小于0.999 9;方法检出限和定量下限分别为0.5~1.0 mg/kg和1.5~3.0 mg/kg。样品加标回收率为89.0%~106.7%,相对标准偏差(RSDs,n=6)为2.0%~6.9%。该方法准确可靠,适用于化妆品中4种禁用醛酮化合物的测定。     

HPLC-MS/MS法测定婴幼儿配方乳粉中胆碱、左旋肉碱、牛磺酸与肌醇

建立了一种同时测定婴幼儿配方乳粉中4种可选择成分(胆碱、左旋肉碱、牛磺酸和肌醇)的高效液相色谱-串联三重四极杆质谱(HPLC-MS/MS)分析方法。样品经温水溶解后用亚铁氰化钾和乙酸锌沉淀蛋白,上清液过滤后采用HSS T3色谱柱分离,三重四极杆质谱仪检测,胆碱和左旋肉碱使用内标法定量,牛磺酸和肌醇使用外标法定量。在最优化条件下,胆碱和左旋肉碱在0.01~2.0 mg/L范围内,牛磺酸和肌醇在0.1~2.0 mg/L范围内呈良好的线性关系,相关系数均大于0.997;胆碱和左旋肉碱的检出限均为1.5 mg/kg,牛磺酸和肌醇的检出限均为15 mg/kg。4种化合物的回收率为87.5%~102.4%,相对标准偏差(RSD,n=6)为3.0%~7.3%。该方法灵敏度高、净化效果好、定量准确,适用于婴幼儿配方乳粉中胆碱、左旋肉碱、牛磺酸和肌醇的同时快速检测。     

钨磷酸催化H2O2氧化降解壳聚糖

钨磷酸催化H2O2氧化降解壳聚糖;壳聚糖;钨磷酸;H2O2;催化降解     

分层多描述编码的率失真

对分层多描述编码的速率失真进行了理论分析,并通过对失真以及速率与量化步长关系的分析,建立了分层多描述模型.     

Synthesis and Crystal Structure of Lanthanide Heteropolymolybdate Complex (NH_4)_(11)Gd[Gd_4Mo_(29)O_(100)(H_2O)_(23)]· 25.75H_2O

The title complex crystallizes in the triclinic system, space group P1with a = 16.9568(5), b = 18.8631(6), c =24. 1640(8) (A。), α = 100. 110(1), β=92.330(1), γ=113.368(1)°, V=7602.54(4) (A。)3, Dc =3.002 g/crn3, F(000) =5893, Mr=6245.25, μ(MoKα)=5.010mm-1, Z=2andfinalR=0.0722and wR = 0. 1960 for 16015 observed reflections with Ⅰ≥2σ(Ⅰ). The Gd( Ⅲ ) ion is coordinated by nine oxygen atoms, forming a distorted mono-capped square antiprism, while the Mo( Ⅵ ) ions have their different coordination numbers such as 4, 5 and 6 with different configurations such as tetrahedron, squar e pyramid and octahedron, respectively.     

基于ADPCM算法的汽车智能语音报警系统的设计

介绍了一种采用FPGA硬件实现ADPCM算法的方法,并基于此算法对预先采集的各种报警语音进行压缩编码并存储.在遇到危险时,由单片机做出危险判断,并自动选择播放相应的报警语音以提示驾驶员及时采取措施.     

一种阈值自调整的高速串行信号丢失检测电路

设计了一种应用于高速串行接收端的阈值自调整信号丢失检测电路,其阈值电压可跟随输入信号的共模电平波动和输入数据率的改变来进行自调整,因此可增大输入信号共模范围,适应更多的信号传输速率。该电路基于SMIC 0.13 μm标准CMOS工艺实现,版图尺寸为269 μm×118 μm。仿真结果表明,该电路能够正确检测共模电平在1.15~1.90 V范围内、差模摆幅大于150 mV的串行差分信号。     

Synthesis and Crystal Structure of a New Complex [Cd（C20H14N4）2Cl2]

The title compound [Cd(C20H14N4)2Cl2] 1 was synthesized via the hydrothermal reaction of CdCl2·7H2O and NaOH with 1,3-bis(benzimidazol-2-yl)benzene (BMB), and characterized by elemental analysis and infrared spectra. The crystal of 1 crystallizes in monoclinic, space group C2/c with a = 21.021(6), b = 9.489(3), c = 18.302(6), β = 108.686(6)o, V = 3458.2(19)3, Z = 4, C40H28CdN8Cl2, Mr = 804.01, Dc = 1.544 g/cm3, F(000) = 1624 and μ(MoKα) = 0.829 mm-1. The final R = 0.0306 and wR = 0.0779 for 3334 observed reflections with I > 2σ(I) and R = 0.0796 and wR = 0.0360 for all data. The cadmium atom is four-coordinated by the BMB ligands and Cl atom with a tetrahedral geometry. The extensive N-H···N hydrogen bonding interactions are observed in the structure, which further extend the [Cd(C20H14N4)2Cl2] units into a 1D structure. The thermogravimetric analysis measurement showed that compound 1 has thermal stability as no strictly clean weight loss step occurred below 425 ℃.