共查询到20条相似文献,搜索用时 109 毫秒
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多环芳烃(PAHs)和爆炸残留物是许多工业生产工序的前体物,军事活动的遗留物,所以成为环境中常见的污染物。使用沃特世公司的超高效液相色谱ACQUITY UPLC仪分析上述物质,速度快、灵敏度高,结果非常理想。[编者按] 相似文献
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本文介绍了在C-R3A色谱数据处理装置上实现气相色谱图实时显示的方法及程序设计,色谱图实时显示增强了系统的功能,提高了工作效率。 相似文献
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通过应用超高效合相色谱(UPC2)和超高效液相色谱法(UPLC)对饲料中5种非法添加的苏丹红类染料测定的参数进行比较,为此类染料分析检测方法的选择提供参考。分别应用UPC2和UPLC对染料分析检测条件进行优化,对这两种方法的灵敏度、线性相关性、稳定性和加标回收率等参数的测定结果进行比较。UPLC对苏丹红Ⅰ、苏丹红Ⅱ、苏丹红Ⅲ、苏丹红Ⅳ和溶剂黄2的最低检出限为0.04mg/L,比UPC2测定时有更高的灵敏度;UPLC检测较UPC2有更好的线性相关性;当染料浓度低于10.0 mg/L时,UPLC对染料进行测定有很好的稳定性;当浓度高于10.0mg/L时,两种测定方法的稳定性相当;UPC2方法中5种染料在3min内实现基线分离,与UPLC相比方法更加高效快速,可用于饲料中该类染料的快速分析检测。 相似文献
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本文介绍了负荷传感与LUDV液压系统,分析了在单泵多执行机构时负荷传感与LUDV液压系统的工作特点,并在此基础上建立了负荷传感变量泵、负荷传感液压系统与LUDV液压系统的AMESim模型,进行了仿真分析。 相似文献
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Chain drive system is widely used in the conditions of high-speed, overload, variable speed and load. Many studies are focused on the meshing theory and wear characteristics of chain drive system, but system design, analysis, and noise characteristics of the chain drive system are weak. System design and noise characteristic are studied for a new type Gemini chain of dual-clutch automatic transmission. Based on the meshing theory of silent chain, the design parameters of the Gemini chain system are calculated and the mathematical models and dynamic analysis models of the Gemini chain system are established. Dynamic characteristics of the Gemini chain system is simulated and the contact force of plate and pin, plate and sprockets, the chain tension forces, the transmission error and the stress of plates and pins are analyzed. According to the simulation results of the Gemini chain system, the noise experiment about system is carried out. The noise values are tested at different speed and load and spectral characteristics are analyzed. The results of simulation and experimental show that the contact forces of plate and pin, plate and sprockets are smaller than the allowable stress values, the chain tension force is less than ultimate tension and transmission error is limited in 1.2%. The noise values can meet the requirements of industrial design, and it is proved that the design and analysis method of the Gemini chain system is scientific and feasible. The design and test system is built from analysis to test of Gemini chain system. This research presented will provide a corresponding theoretical guidance for the design and dynamic characteristics and noise characteristics of chain drive system. 相似文献
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云广±800kV特高压直流输电系统额定输送容量巨大,当系统进入孤岛运行方式后,由于整流站靠近云南电网负荷中心且交流系统相对较弱,如果交流或直流系统发生故障,可能会对交直流系统的稳定性造成严重影响.利用实时数值仿真器(RTDS)和实际直流控制保护装置搭建了详细的孤岛运行闭环系统试验模型,研究了云广特高压直流输电系统在孤岛... 相似文献
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Chong Li Lizhong Xu Jianqiao Zhang 《Journal of Mechanical Science and Technology》2016,30(7):2961-2970
In this paper, the nonlinear coupled dynamics equations of the electromechanical integrated harmonic piezodrive system are proposed. Using these equations, the bifurcation and chaotic vibrations of the drive system are investigated. The results show that chaotic vibrations occur in the drive system under some parameters. The voltage on the piezoelectric actuator, the stiffness factor and the length of the piezoelectric actuator significantly affect the nonlinear vibrations of the drive system. The ranges for the system parameters that lead to a drive system with bad dynamics are shown. These results can be used to predict the dynamic load in a drive system and are useful for maximizing the power density of a drive system. 相似文献
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简要介绍了决策支持系统(DSS)的产生和发展,论述了决策支持系统的系统结构和3个技术层次,辨析了DSS与管理信息系统(MIS)的区别和联系,重点研究了基于DSS的模型库和方法库的设计与实现。阐述了模型库系统的3个组成部分和方法库系统的体系结构,并对模型库与方法库之间的关系调用问题进行了详细分析。提出了模型库系统调用方法库中方法的实现方案。本文介绍的内容,对DSS应用具有一定的参考价值。 相似文献
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The dynamics of an ultrasonic rod system with a piezoelectric vibration exciter are examined. Based on the analysis of the equations of vibrations of the electromechanical system, methods of resonance adjustment are described. The main features of constructions and system operation in resonance conditions are identified. Methods for the selection of optimal system parameters causing maximal amplitude of variations of the working system element are found. 相似文献
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分析了无人机电动舵机伺服系统各组成部分的原理,利用Matlab/Simulink工具建立了整个舵系统数学模型,并对舵系统的输出力矩、转速以及位置的动态响应进行了仿真。之后建立了舵系统的传递函数模型,对舵系统的稳定性指标进行了仿真分析。结果表明通过两种方式对电动舵机回路进行建模分析,有利于更全面准确的了解系统动态特性,减少了舵系统设计难度,增强了系统的可靠性。 相似文献
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李金春 《工业仪表与自动化装置》2014,(6):20-23
以MES( Manufacturing Execution System)理论为基础,通过对机务段生产现场的详细需求分析,提出了机务段生产管理信息系统的建设思路和设计原则。以某机务段企业信息化建设为例,设计了机务段生产管理信息系统。针对系统建设目标,设计了系统的网络环境和硬件结构。结果表明了选用MES功能模型作为软件框架的合理性和可行性,成功地实现了该系统。 相似文献
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