一种新的动态多尺度系统最优估计算法

给出了一类动态多尺度系统基于Haar小波的序贯式最优估计算法，该算法具有较低的计算复杂度和较高的实时性，为多传感器信息融合提供了一种新的方法。仿真结果验证了这种方法的有效性。     

一种不对称配电网三相潮流快速算法

为了适应在线潮流计算对速度的要求,阐述了一种配电网潮流快速算法,并通过增加内电势点对其作了一些改进,使其对实际运行中的各种三相网络不对称情况都能进行快速准确的计算.该方法只需要两个成熟的矩阵--母线注入到支路电流和支路电流到母线电压矩阵以及一个简单的矩阵乘法就能完成潮流的快速计算.用Matlab语言实现了该算法.并通过算例将其与牛顿法作了比较,测试结果证明了该算法的高效性和准确性.     

分布式测量系统服务窗口动态调度方法研究

在网络制造环境下, 动态时间性能是测量系统的重要指标. 针对基于 CORBA (Common object request broker architecture) 和尺寸测量接口标准 (Dimensional measurement interface standard, DMIS) 的分布式测量系统 (Distributed measurement system, DMS), 根据多用户非抢占优先排队网络静态性能模型, 提出基于无穷小摄动分析的样本轨道划分方法, 建立测量系统服务窗口的动态调度算法, 实现测量系统的时间性能调优. 通过在一个制造工厂中进行的应用实验, 证明了此方法的有效性.     

Desorption mass spectrometry of olestra

Field desorption (FD), fast atom bombardment (FAB) and plasma desorption (PD) mass spectrometry have been used for the characterization of olestra, a mixture of octa-, hepta- and hexaesters of sucrose formed by reaction of sucrose with long-chain fatty acids (C₁₂–C₁₈). Most previous applications of desorption ionization mass spectrometry have involved polar compounds; however, the relatively low-polarity olestra is also amenable to these techniques with proper sample preparation. Field desorption provides molecular weight information, but the transience of the signals limits the usefulness for observing fragmentation and measuring ester distributions. In addition, FD may not be sensitive enough to allow characterization of fractions isolated from analytical high-performance liquid chromatography (HPLC) columns. Fast atom bombardment produces longer-lasting signals, which permit characterization of components over a wide mass range. However, signal-to-noise fluctuates substantially, depending on analyte solubility in the matrix, making the characterization of partial esters collected from HPLC uncertain and difficult. Plasma desorption mass spectrometry is the easiest and most sensitive technique for olestra characterization but provides the lowest mass resolution. Because it requires no more than a few μg of material, it is effective for the characterization of HPLC fractions. Furthermore, it is the only method, of the three investigated, that allows detection of intact dimeric species having molecular masses in the 3,000 to 5,000 dalton range.     

负荷控制系统在池州供电公司需求侧管理中的应用

在电力需求侧管理中,直接负荷控制是其重要内容。文章重点针对可控负荷(主要是空调和电热水器负荷),提出了一种基于线性规划的数学模型。该模型能考虑控制的负荷约束,事先设定一定的控制模式,通过求解模型线性规划从而可以求得最优的控制策略,最小化一个配电网的峰荷。最后,文章以池州市2007年夏季、冬季的两个典型日负荷作为算例,验证了该模型的可行性。     

从防电击事故理解和采用IEC标准的必要性

1.概述自80年代开始,我国鼓励在产品生产和工程建设中采用ＩＥＣ标准,我国的产品质量和工程质量因此得到了相当的提高。由于种种原因,我国不少电气标准还未做到与ＩＥＣ标准接轨,而只是向国际标准靠拢,标准与标准间也不完全协调衔接,因此电气安全水平还相对较低。随着我国...     

运用质量管理工具改进啤酒风味

啤酒中的DMs含量波动受生产过程影响较大，通过运用质量管理工具对其影响因素进行比较分析，为实现低DMs水平产品提供帮助。     

Palatability of Macroalgae that Use Different Types of Chemical Defenses

This study compared algal palatability and chemical defenses from subtropical green algae that may use different types of defense systems that deter feeding by the rock-boring sea urchin Echinometra lucunter. The potential defense systems present include (1) the terpenoid caulerpenyne and its activated products from Caulerpa spp., and (2) dimethylsulfoniopropionate (DMSP)-related defenses in Ulva spp. Secondary metabolites from these chemical groups have been shown to deter feeding by various marine herbivores, including tropical and temperate sea urchins. Live algal multiple-choice feeding assays and assays incorporating algal extracts or isolated metabolites into an artificial diet were conducted. Several green algae, including Ulva lactuca, Caulerpa prolifera, and Cladophora sp., were unpalatable. Nonpolar extracts from U. lactuca deterred feeding, whereas nonpolar extracts from C. prolifera had no effect on feeding. Polar extracts from both species stimulated feeding. Caulerpenyne deterred feeding at approximately 4% dry mass; however, dimethyl sulfide and acrylic acid had no effect at natural and elevated concentrations. E. lucunter is more tolerant than other sea urchins to DMSP-related defenses and less tolerant to caulerpenyne than many reef fish. Understanding the chemical defenses of the algae tested in this study is important because they, and related species, frequently are invasive or form blooms, and can significantly modify marine ecosystems.