全自动整体式毛细管规模液相色谱系统——Waters CapLC~(TM)系统

毛细管液相色谱系统是Waters多年心血的杰作。它利用最先进的光纤技术,使系统可以提供比传统分析规模HPLC高50倍的灵敏度。毛细管水平的流路不仅几乎无死体积,而且可以平稳而高度重现地输出低至1ul/min的流动相,非常适合与质谱检测器的连接。精心的设计与制作,使CapLC系统能够提供优于传统HPLC系统的保留时间重现性与分辨率。系统很适合分析样品量很小的被测物,在疾病目标识别、生化分子和小分子药物的药代动力学研究等方面有广阔的应用前景。 CapLC配以快速高吞吐量进样器和二极管矩阵检测器,是全自动的毛细管LC/MS系统组件     

海马补肾丸中异补骨脂素的含量测定

采用HPLC法测定了海马补肾丸中异补骨脂素的含量;结果表明本方法测量准确,重现性好,可用于该制剂的质量分析。     

吉尔森高效液相色谱系统

高效液相色谱仪(HPLC)作为一种有效的分离工具已经广泛应用于各种分析、制备领域。如药物、药理、生物化学、无机、有机化学、石油化工、环境保护及法庭科学等等。近年来,国内各行各业对HPLC的需要也日益增加,并且不断地从国外引进各种不同的HPLC系统。目前在中国市场上见的比较多     

强保留固定相的色谱特性

在新方法的发展过程当中,色谱方法最重要的目标之一是得到具有一致性且可重现的分离。选取具有高重现性和良好性能的高效液相色谱（HPLC）柱是实现这一目标最基本的要素。对装入HPLC柱的色谱介质进行物理测试毋庸置疑也是非常重要的,该测试可以揭示HPLC柱的部分色谱特性。柱的本身特性以及如何与一个宽范围的分析物相互作用只能通过严格的色谱评估来获得。     

高效液相色谱法测定复方花针颗粒中绿原酸的含量

报道了采用HPLC法测定复方花针颗粒中绿原酸的含量。色谱柱为ZOR-BAXSB-C18分析柱,流动相为乙腈-2％冰醋酸(6.5:93.5),检测波长为 326nm。实验结果表明,该方法简便、准确,灵敏度高,重现性好。     

阴离子交换色谱法用于肝磷脂钠的纯度评价

介绍了一种用于对肝磷脂中过硫酸化软骨素硫酸盐（OSCS）分离和定量的高效液相色谱（HPLC）方法。该方法使用阴离子交换色谱实现了肝磷脂和OSCS的完全分离,并用紫外吸收法对肝磷脂和OSCS进行了定量。实验结果表明,该方法不但具有重现性好和分析速度快（10min）的优点,而且可以在OSCS浓度低于总浓度1%时也能够对其进行有效检测。这种HPLC方法突破了毛细管电泳分析肝磷脂方法固有的局限性。     

722型光栅分光光度计

用途: 本仪器为常规实验室中多用途分析仪器,可在可见光谱域内对物质作定性、定量分析,广泛应用于医药卫生、临床检验、生物化学、石油化工、环境保护、质量控制部门。主要特点: 集长期专业设计及制造经验的结晶,仪器结构简洁,读数及重现性杰出地稳定。     

分析规模亚临界/超临界萃取装置的研制

本文介绍了新一代分析规模SFE2000型亚临界/超临界萃取系统的结构和性能.通过大量试验证明,该仪器性能稳定、重现性良好,可满足定量萃取的要求.     

考虑系统重用和加工任务重现的制造系统布局重组规划

针对多零件族变批量的生产需求,为降低系统重新配置的代价,提出考虑系统重用和加工任务重现的制造系统布局重组规划方法。分析系统重用和加工任务重现的必要性,建立相应的测度指标,依据优先关系、唯一性、加工功能、生产节拍、最大空闲时间、车间空间等约束条件,以追加投资、重组成本、空闲时间、加工任务重现度、系统重用度等指标的线性组合为目标函数,建立面向多零件族变批量需求模式的布局重组规划模型,并给出基于遗传算法的布局重组算法。以某车间的柴油发动机缸盖加工生产线为例,验证该规划方法的正确性和有效性。结果表明:所提出的集成布局重组规划方法是以现有系统布局形态为基础,实现了重组过程的重用性和经济性,同时满足了制造系统对生产功能和生产能力的需求。     

HPLC法测定小儿消食片中橙皮苷的含量

目的采用HPLC法测定小儿消食片中橙皮苷的含量.方法HPLC法,VP-ODS柱(4.6mm*250mm),流动相乙腈-0.4%磷酸溶液(2476),检测波长283nm,流速1.0ml·min-1;结果橙皮苷在1.56μg～15.61μg范围内有良好的线性关系,r=0.9999(n=5),平均回收率为98.79%.结论该方法分离度高,重现性好,简便,准确,可用于小儿消食片的质量控制.     

供应链中车辆路径问题的研究进展及前景

车辆路径问题是供应链研究的一项重要内容。本文概述了近年来车辆路径问题的现状;介绍了车辆路径问题主要的几种分类方法;总结了车辆路径问题中几种常见的附加条件。分别介绍了确定车辆路径问题、随机车辆路径问题和模糊车辆路径问题出现的背景及其具体应用场合,讨论并总结了针对这些问题的不同建模方法和算法求解思路,以及这些算法的优点、局限和适用范围。简要介绍了国内该领域的发展现状,并结合供应链应用的需要,指出车辆路径问题的研究发展方向。     

The stereology of projected images

A generalized, geometrical approach is adopted in reviewing the basic relationships of projected structures. Projections of features from a plane to a projection line, and from a three-dimensional foil to a projection plane are considered briefly. The relationships that apply to apparent and total projections are next assembled for lines, surfaces and bounded regions. The properties of convex bodies, the geometrical attributes, and the related projected quantities are enumerated. The inter-relationships of important microstructural parameters are expressed for convex bodies in space, in sections, and in the projection plane. Based on the important concept of total projection, expressions are obtained that correct for truncation and overlap of particles in foils. Approximations to the total projection are developed for lines obscured by surfaces, and for points hidden by surfaces in space. Finally methods for determining size distributions of particles in thin foils are reviewed and recent modifications to the original procedures are discussed.     

A Comparative Study on the Three-Dimensional Surface Topography for the Polished Surface of Femoral Head

Several surface topographic techniques have been widely used in many manufacturing engineering fields for studying the surface characteristics for the practical application of manufacturing surfaces. In this paper, a polished surface of a femoral head is considered for the compatative study, where the stylusbased technique, the autofocused optical measurement technique, the interferometric technique, and scanning probe microscopy are applied. After the operational principles are introduced, some practical comparative measurements are reported for the polished surface. Some useful comparisons and conclusions are drawn from the comparative study. General guidelines for the 3D surface topography are also given for practical application.     

适应盘套类零件高速切削的离心式弹性夹具

文章介绍了两种用于盘套类零件高速切削的离心式弹性夹头，简要介绍了其结构和工作原理，给出了夹紧力和驱动力矩的计算公式。并给出了此类离心式弹性夹头的设计准则。     

煤堆体积检测仪精度分析

本文根据光学三角原理,导出鉴别误差解析表达式,并对不同高度梯形截面煤堆鉴别误差进行计算;根据重积分梯形公式的余式和中心极限定理.导出总体各截断误差密度分布函数服从正态分布;最后给出对不同情况下估计误差的结论意见。     

Feasible workspace regions for general two-revolute manipulator

In this paper, a topology is presented for feasible workspace regions in general two-revolute manipulators. The design problem and concept of feasible workspace regions have been discussed as linked to each other. Design equations are formulated by arbitrarily prescribing four workspace boundary points. The so-called feasible workspace regions are the intersection of three different sub-regions, which are given by constraint curves as function of the relative positions of three workspace boundary points. By using a parametric study, all topologies for three sub-regions are figured out. Corresponding areas in cross section plane are determined for prescribing the position of a feasible workspace point as function of the topology for sub-regions. A classification has been proposed to determine and to characterize the combination of the topologies for those sub-regions. All topologies for feasible workspace regions are figured out and they are discussed as a design tool. Three general cases are analyzed in details to characterize workspace design capabilities for general two-revolute manipulators.     

Bioengineering aspects of sensors and instruments for continuous monitoring of a ventilated newborn

This paper examines critical aspects of sensors and measurement instruments used in the clinical care of mechanically ventilated newborn babies. The key variables for ventilator control are described and sensors for gas flow and volume are evaluated. The continuous real-time monitoring of critical physical and chemical variables can provide important data that can be used to optimize mechanical ventilator parameters. The options for invasive and noninvasive measurement approaches are introduced and issues relating to the trade-offs between measurement precision and accuracy and patient safety are discussed. Sensors for blood gases, hemodynamic variables, pulmonary mechanics parameters, and ventilator characteristics are described. Accurate gas flow sensors are needed for the effective delivery of an optimized ventilator therapy; the hot-wire anemometer and the pneumotachograph are evaluated. A preliminary study to develop a rationale based on artificial intelligence decision trees for choosing sensors and instruments is presented.     

NICU心电监测中的干扰及其对策

目的：分析NICU（新生儿重症监护室）惠儿护理过程中的心电监测的干扰,并提出相应的对策。方法：通过分析新生儿心电监测中的各种干扰源,并针对50Hz交流干扰这一主要的干扰源,提出了解决的有效对策。结果：有效地解决了新生儿护理过程中,心电监测的干扰问题。结论：针对新生儿心电监测中的50Hz交流干扰提出的对策,可以推广使用。     

加筋板广布疲劳损伤的剩余强度分析

给出加筋板广布疲劳损伤的两种损伤类型和两个剩余强度判据,剩余强度判据是净截面塑性区屈服判据和裂尖韧带屈服判据.给出蒙皮带有多裂纹和蒙皮带有多裂纹且桁条也带有裂纹时应力强度因子的近似工程估算方法.文中也给出加筋板含多裂纹时剩余强度净截面塑性区屈服判据和裂尖韧带屈服判据的表达式及塑性区尺寸估算方法.对三种损伤的加筋板进行剩余强度试验,指出多裂纹尤其是桁条也带裂纹时剩余强度降低较多.用上述两种判据进行加筋板广布疲劳损伤剩余强度预测,预测结果和试验结果比较符合.     

一种数字频率电压紧急控制装置的设计与实现

介绍了一种频率电压紧急控制装置的设计与实现方法。装置采用32位嵌入式单片机作为核心控制芯片,利用双电压回路进行电压测量,硬件和软件相结合实现频率测量,提高可靠性,确保测量准确。对任一故障的判断和决策都采用多个不同的条件,多重闭锁机制,有效防止误动和拒动;大屏幕液晶实时显示电压、频率等信息。嵌入式双网通信接口,采用国际标准或按用户要求定制通信规约。