Adjustment of a GC automatic liquid sampler for high-performance liquid chromatography

Summary An automatic liquid sampler for high-performance liquid chromatography is described.The sampler is based on a GC-injection system from Hewlett-Packard. The HPLC sampler has a unique cleaning system, excellent reproducibility and a plug-in compatibility for sample identification and computer control for Hewlett-Packard integrators and Laboratory Data Systems.     

电饭锅自动控温电路的设计和安装

本文紧紧抓住学生对“自动控温”这一普通现象的好奇 ,积极引导学生去探索和研究 ,使学生在掌握“自动控温”原理的基础上 ,按照自己的意愿和设想来设计一个电路并能动手组装和检验。     

A semi-automatic method for measuring interferometry fringes: prototype design and first results

A device for automatically obtaining the information contained in holographic interferometry fringes is proposed. The method may be applied to any kind of interferometric fringes. Accuracy has been demonstrated by contrasting the results obtained with our prototype system and those with the single-beam speckle interferometry technique for the measurement of displacements in a plane. The results show good correlation between the two series of measurements.     

Slope enclosures for functions given by two or more branches

In this paper, we consider the automatic computation of slope enclosures for continuous real functions given by two or more branches, such as piecewise defined nonsmooth functions. We show that a commonly used formula found in the literature does not always provide a slope enclosure for such functions. Furthermore, we prove a similar formula that always holds. AMS subject classification (2000)  65G20     

An Euler system source term that develops prototype Z‐pinch implosions intended for the evaluation of shock‐hydro methods

In this paper, a phenomenological model for a magnetic drive source term for the momentum and total energy equations of the Euler system is described. This body force term is designed to produce a Z‐pinch like implosion that can be used in the development and evaluation of shock‐hydrodynamics algorithms that are intended to be used in Z‐pinch simulations. The model uses a J × B Lorentz force, motivated by a 0‐D analysis of a thin shell (or liner implosion), as a source term in the equations and allows for arbitrary current drives to be simulated. An extension that would include the multi‐physics aspects of a proposed combined radiation hydrodynamics (rad‐hydro) capability is also discussed. The specific class of prototype problems that are developed is intended to illustrate aspects of liner implosions into a near vacuum and with idealized pre‐fill plasma effects. In this work, a high‐resolution flux‐corrected‐transport method implemented on structured overlapping meshes is used to demonstrate the application of such a model to these idealized shock‐hydrodynamic studies. The presented results include an asymptotic solution based on a limiting‐case thin‐shell analytical approximation in both (x, y) and (r, z). Additionally, a set of more realistic implosion problems that include density profiles approximating plasma pre‐fill and a set of perturbed liner geometries that excite a hydro‐magnetic like Rayleigh–Taylor instability in the implosion dynamics are demonstrated. Finally, as a demonstration of including and evaluating multiphysics effects in the Euler system, a simple radiation model is included and self‐convergence results for two types of (r, z) implosions are presented. Copyright © 2008 John Wiley & Sons, Ltd.     

自动电位滴定法测定铜精矿中高含量氯

使用无水碳酸钠-氧化锌混合熔剂焙烧半熔铜精矿样品,分离大量的基体元素,用沸水浸取半熔物,在乙醇-水溶液中用硝酸银标准溶液电位滴定测定试液中的氯量;利用氯与银发生化学反应生成氯化银沉淀的原理以及电位突跃判断滴定终点。方法操作简单快速,重现性好,适应性强,可准确测定铜精矿中高含量氯(0.10%~5.00%)。     

基于虚拟现实的装甲装备维修性定量指标验证方法研究

对维修性定量指标验证的研究现状进行分析,提出构建基于虚拟现实的产品维修性定量指标验证系统;首先,根据系统需求构建出系统的总体框架;其次,对系统搭建过程和仿真过程中的关键技术进行阐述;再者,对国军标中维修性定量参数估计模型进行改进,构建适用于复杂装备的虚拟仿真MTTR估计模型;最后,在验证系统中对某型车辆传动装置进行MTTR虚拟仿真试验,并运用MTTR估计模型进行MTTR验证;对比得到,通过虚拟仿真试验得到的验证结果与实车试验数据得到的结果基本一致,具有较高的可信性;该方法为在产品研制设计阶段并行维修性定量指标的验证工作提供了非常重要的参考价值。     

基于CPLD高精度恒流源技术的呼吸体积描记系统的设计

利用呼吸感应体积描记(RIP)技术测量呼吸参数已得到了越来越广泛的认可,针对人体呼吸运动引起传感线圈的电感量变化非常小(小于几百nH),一般系统难以保证精确性和适用性问题;硬件设计采用了高精度恒流源,锁相放大和自动增益控制放大电路,并详细分析了各部分电路的特性,包括在平静呼吸和用力呼吸模式下分别对14位测试者测量潮气量和呼吸频率,并且与德国耶格公司的肺功能仪所测量的结果对比;实验证明RIP系统在这两种模式下测量潮气量和呼吸频率等呼吸参数与速度描记仪存在显著的正相关关系,说明该系统工作良好、测量精确,操作简单、便于携带和低功耗,未来可以在临床上推广应用于长时间动态的呼吸监测。     

中子多重性钚-铀部件质量测量系统及实验进展

为了对核弹头中拆卸下来的和处于库房存储状态的核部件的质量进行无损测量,搭建了一个由32根3 He正比计数管和方型高密度聚乙烯慢化腔体构成的中子多重性探测器,采用8通道电子学处理器件进行中子脉冲信号分析,基于5组252 Cf中子源对中子多重性探测器进行标定,验证了自主开发的标定算法,获取了系统标定参数。分别对6个武器级罐装钚部件,7个罐装铀部件进行中子多重性实验测量,实验分析结果显示:基于点模型修正后的钚部件中子多重性质量测量值与标称值偏差小于1.5%,基于双Am-Li源标定曲线法的铀部件质量测量偏差小于5%。