三重四极杆串联质谱仪碰撞池的研究现状与进展

三重四极杆质谱仪以其卓越的定量能力在环境、食品、药品领域有着广泛的应用.分析物离子在第一级四极杆中被选择,然后进入碰撞反应池发生碰撞反应生成子离子,子离子被第二级四极杆选择分析.碰撞反应池是三重四极杆质谱仪的关键部件,目前碰撞反应池多采用多极杆结构,多极杆上施加射频电压及静电压用于传输离子.减小离子在碰撞池中的驻留时间以最小化多反应监测(MRM)的串扰影响是碰撞池设计需要考虑的重要因素,各个仪器厂商都有各自专利的碰撞池设计实现最小化的串扰影响,本文针对各个厂商最新的碰撞池技术进行介绍.     

碰撞/反应池ICP-MS性能及应用进展

对碰撞/反应池ICP-MS的性能及应用进展进行了综述。碰撞/反应池是目前四极杆ICP-MS首推的,最有效的消除多原子干扰的技术,近年来已经在痕量超痕量多元素分析、形态分析和同位素比值分析中得到很好的应用。预期在今后将继续发挥作用,并扩大其应用范围。     

碰撞反应池-电感耦合等离子体质谱仪测定卷烟纸中的Na、K和Ca

为控制卷烟纸质量稳定性,建立了卷烟纸中Na、K和Ca的碰撞反应池-电感耦合等离子体质谱仪测定方法。方法采用10%硝酸溶液提取卷烟纸中目标物,采用离线内标、在线稀释法和耐高盐基质方法消除样品基体效应,采用碰撞反应池消除目标物的多原子干扰,用仪器自带新型正交检测器系统(ODS)提高样品动态测定范围。结果表明:方法检出限在之间0.08~0.20mg/kg,加标回收率在98.2~103.2之间,精密度小于3.4%。表明方法前处理简便快速、结果准确可靠,可用于卷烟纸中Na、K和Ca的同时测定。     

基于UWB测距和组合惯导的既有线吊车防碰撞方法研究

既有线施工改造过程中,可能出现吊车臂碰撞到附近障碍物,尤其是既有线结构体的现象,为了解决此问题,通过采用组合惯导+UWB测距的方式,结合现场吊车模型与既有线BIM模型的图形碰撞算法,设计一种吊车臂防碰撞检测系统及方法。经工程现场实际部署测试,本技术路线方法可行,并同时具有应用的经济性与技术独创性。     

汽车碰撞安全和气囊技术及标准国际研讨会成功召开

2012年7月11-12日,由全国汽车标准化技术委员会和中国标准化协会汽车分会主办的"汽车碰撞安全和气囊技术及标准国际研讨会"在大连成功召开。来自标准主管部门领导、国内外的专家学者、企业嘉宾等百余人参加了本次研讨会,共同就车辆碰撞技术及标准、碰撞测试和数据采集技术、气囊匹配技术、智能气囊、气囊零部件试验技术及标准的发展等展开研讨,并对今后标准研究制定的重点领域进行交流。本次研讨会上,来自沃尔沃、通用、丰田、戴姆勒、福特、中国汽车技术研究中心、上海泛亚、上海大众、一     

关于新能源汽车技术发展的未来方向的研究

文章分析了新能源汽车的技术路线,探析未来新能源汽车的发展方向,主要有这样几个方面：目前最具可行性的新能源汽车技术就是混合动力电动汽车,新能源汽车发展的主流路线和最终目标是纯电动汽车,有限的氢燃料汽车技术的发展前景,新能源汽车未来中短期发展的补充之一是生物燃料汽车技术,未来电动汽车能源补充的有效辅助途径是太阳能汽车技术。     

基于TRIZ的传动带结构进化研究

介绍了TRIZ(theory of inventive problem solving)技术进化理论、技术进化模式与进化路线,通过对传动带结构发展的研究,归纳出曲面化、精简化、多维化、微观化4种进化模式及5条进化路线.分析了各条进化路线的进化潜力及发展方向,对传动带未来的结构状态进行了分析和预测,提出了复合曲面传动带、...     

朔本求源

自2010年SCR被确定为柴油机排放控制技术路线后，各内燃机企业纷纷加大了催化还原系统的研发力度。在第十届内燃机展览会上，采用先进SCR技术的发动机成为主要内燃机企业展台的亮点。专家介绍，SCR技术路线包括两部分，     

基于TRIZ的带式输送机输送带结构的进化研究

在介绍TRIZ技术进化理论、技术进化模式与进化路线的基础上,按照基于技术进化理论的产品进化研究过程对带式输送机输送带结构的进化进行了研究,归纳了其发展的阶段,并选择了输送带结构的进化路线,提出了改进方案。     

车辆主动性防撞专利技术综述

在众多交通事故中,碰撞是其主要的表现形式,如何提升车辆自身的安全性能也是至关重要。主要以中文专利数据库和外文专利数据库中的检索结果为分析样本,从专利文献的视角对车辆主动性防撞的发展进行了全面的分析,总结了与车辆主动性防撞相关的全球及在华专利的申请趋势、主要申请人分布以及重要技术分支,并对重要技术分支的发展路线进行梳理分析。     

包容盒干涉检查方法在Pro/E下的实现

碰撞干涉检查在产品装配仿真中起着重要作用,包容盒方法可以有效地解决干涉检查固有的计算复杂性。根据产品零部件不同类型提出了三级精度包容盒相结合的快速干涉检查算法,并在Pro/EN-GINEER环境下加以实现。通过人机交互界面应用于汽车变速器装配仿真过程中零部件之间的碰撞干涉检查。     

冲压、回弹及应变速率对双相钢成形件碰撞性能影响的模拟

针对冷轧镀锌双相钢板,在完成U型梁冲压成形及回弹模拟分析的基础上,建立了闭口帽型梁的碰撞分析模型;采用映射的方法完成了U型梁的厚度、应力、应变向碰撞结构件的结果传递;在考虑冲压成形、回弹及应变速率等的情况下,对帽型梁的碰撞过程进行了模拟分析。结果表明:在碰撞过程中,由于应变速率较高,它的影响最为明显,在模型的定义过程中需要着重考虑;因为金属变形过程的加工硬化和厚度减薄等因素的影响,冲压结果直接影响碰撞过程的模拟结果;冲压后因回弹使零件内部的应力得到释放,残余应力减小,因此导致碰撞过程中产生相同的变形需要更大的外力,考虑回弹的刚性墙反力要比没有考虑时的高。     

匀速直线运动多面体4D干涉检测算法

已有的干涉检测算法采用在离散的时间点上进行求交的方法 ,效率和可靠性低 ,本文提出一种匀速直线运动多面体在时间和空间的 4维直线求交干涉检测算法 ,其检测效率与静止物体的干涉求交相同     

基于柔性止动的MEMS惯性开关冲击可靠性强化

为了提高MEMS惯性开关的冲击可靠性,提出了一种柔性止动结构。首先,利用连续接触力理论建立了止动碰撞模型,通过Simulink对模型进行仿真,研究开关在不同止动形式下的响应特性。接着,从空间占用和应力集中的角度对悬臂梁和平面微弹簧两种止动形式进行讨论,设计止动结构。最后,利用UV-LIGA工艺制作开关样机,通过落锤冲击系统对样机进行测试。碰撞接触力对于冲击可靠性至关重要,Simulink仿真结果表明柔性止动结构能够极大的延长碰撞接触时间,从而降低接触力。同时,采用柔性止动还改善了碰撞后的弹跳现象,提高闭锁稳定性。冲击试验表明,开关累积失效分布函数符合韦布尔分布,标度参数(参考加速度)α=29 600、形状参数β=8.2。相比无柔性止动的MEMS开关,提出的柔性止动明显改善了开关的抗冲击性能。对柔性止动的建模、仿真与试验为MEMS惯性开关的抗冲击设计提供了有益参考。     

COLLISION AVOIDANCE DECISION- MAKING MODEL OF MULTI-AGENTS IN VIRTUAL DRIVING ENVIRONMENT WITH ANALYTIC HIERARCHY PROCESS

Collision avoidance decision-making models of multiple agents in virtual driving environment are studied. Based on the behavioral characteristics and hierarchical structure of the collision avoidance decision-making in real life driving, delphi approach and mathematical statistics method are introduced to construct pair-wise comparison judgment matrix of collision avoidance decision choices to each collision situation. Analytic hierarchy process （AHP） is adopted to establish the agents＇ collision avoidance decision-making model. To simulate drivers＇ characteristics, driver factors are added to categorize driving modes into impatient mode, normal mode, and the cautious mode. The results show that this model can simulate human＇s thinking process, and the agents in the virtual environment can deal with collision situations and make decisions to avoid collisions without intervention. The model can also reflect diversity and uncertainly of real life driving behaviors, and solves the multi-objective, multi-choice ranking priority problem in multi-vehicle collision scenarios. This collision avoidance model of multi-agents model is feasible and effective, and can provide richer and closer-to-life virtual scene for driving simulator, reflecting real-life traffic environment more truly, this model can also promote the practicality of driving simulator.     

Graphics-assisted approach to rapid collision detection for multi-axis machining

Collision detection is a critical problem in multi-axis NC machining with complex machining environments. Using a combination of machining environment culling and a two-phase collision detection strategy, a rapid and robust collision detection approach is implemented. With this approach, the machining environment is initially subdivided and organized hierarchically using a binary space partitioning (BSP) tree structure. Before carrying out precise collision detection, the machining environment is culled conservatively to remove most of the irrelevant geometries from further checking steps which are relatively time consuming. For the later stage of precise collision detection, which is the most complicated and time-consuming task in many existing approaches, a strategy of using two-phase collision detection is developed in order to make the approach not only efficient in computation and but also maintain a high detection precision at the same time. Another important benefit of this approach is that it takes advantage of the rapid performance of graphics hardware to generate visibility information very efficiently. We show how this information could be used in assisting collision detection. An example of five-axis machining in a complex environment is adopted as the case study to demonstrate the proposed approach. It has shown that the collision detection task can be achieved with a near real-time performance.     

面向关系的碰撞检测方法研究

碰撞检测和干涉校验一直是虚拟现实技术的难点，即如何在实现碰撞检测和干涉校验的完全性和唯一性的基础上，提高虚拟环境的渲染效率。提出了基于分类的动态图结构，详细阐明了这一结构的抽象类表示和实现方法。以CDG结构为基础，实现了一个虚拟加工环境，该环境能对用户输入的G代码进行实时加工模拟，预估计加工的过程和结果。实验证明，这一虚拟加工环境实现了碰撞检测、干涉校验和关联运动，并有很好的实时性，即使在Internet上进行渲染也有很高的渲染效率。     

碰撞/反应池技术在等离子体质谱仪上的应用和发展

Over the past 8 years, the commercial collision/reaction cell with inductively coupled plasma mass spectrometry (ICP-MS) has been developed and improved continuously. The commercial cell devices benefit from the original fundamental framework on the collision cell. Now the processes and principle of the collision or reaction are clearer than before. There are two approaches for collision/reaction cell technology to overcome spectral interference problem in ICP-MS: a) remove isobaric interference; b) shift the analyt to less interference mass. The kinetic energy discrimination effect and bandpass has been applied respectively on different multipole cell for ejecting the undesirable interferences species produced within cell. The cell gas selection is depend on which interference species want to be compressed and the working characteristics of the cell. To meet most routine task for a wide range of multi-element measurement, a new approach is developed and work on two mixed gas mode switching. An additional important characteristic with the cell (collision focusing) has been noticed and applied to get excellent precision in isotope ratio measurement.     

An adaptive control system with self-organizing fuzzy sliding mode control strategy for micro wire-EDM machines

Collision detection is a fundamental component to simulate realistic and natural object behaviors in virtual reality-based system. In this paper, a hybrid method of space decomposition and bounding volume approach is presented to assist modular fixture assembly design in a virtual environment. Based on characteristics of modular fixture, a novel space decomposition methodology at object level is proposed, which is achieved by automatically partitioning the checking space into cells according to the oriented bounding boxes of assembled elements after the initial approximate collision detection using the intersection checking method based on separation plane-based bounding box. Then the pairs of candidate objects are determined for narrow phase exact polygons overlap tests. Results from several performance tests on modular fixture design system show that an important advantage of this proposed method compared with other universal algorithms is its simple information representation and low preprocessing cost.