顺应便携式医疗保健应用的需求

两种趋势影响着医疗和工业设备设计人员:一是便携性,二是此类设备越来越多地用于消费和实验室应用。血糖监控仪、多参数血液分析仪、脉搏血氧仪、PH计和环境监控仪就是其中的例子,这些设备一度仅存在于     

电话接口模块PH8810在电话遥控系统中的应用

PH8810是一款集成度高、功耗低、使用灵活的电话接口模块。介绍了该模块的内部结构、基本特点、管脚功能及应用场合,详细阐述了电话遥控系统的工作原理,以及使用PH8810构成电话遥控系统的实现方法,并给出了具体的设计电路。实践表明,该电路系统结构简单、易于调试、性能稳定,加装后不影响电话的正常使用,具有广阔的应用前景。     

激光跟踪仪校准技术及在机床检测中的应用

讨论了激光跟踪仪的校准技术,分析了测量误差来源及误差对跟踪仪产生的影响,并利用三坐标测量机对激光跟踪仪进行了校准。结合生产需要,利用激光跟踪仪高效地对大型机床进行检测,制定了激光跟踪仪检测大型机床的方法。结果显示,利用激光跟踪仪能够精确地、高效地对机床进行检测,并指导工人对机床进行维护和调整。研究结果表明,激光跟踪仪不仅能对现场的机床进行精度检测,而且能对不易搬动的零部件、生产线以及夹具等进行测量。     

溶氧仪及其在赖氨酸发酵过程中的应用研究

文章简述了溶氧检测系统在赖氨酸发酵过程中的重要性,阐述了溶氧的检测方法和溶氧仪的种类及检测原理,溶氧仪在赖氨酸发酵过程中的应用。     

铅在酸性土壤中的腐蚀行为研究

采用试件自然埋藏的方法研究了铅护套在酸性土壤中1～8年的腐蚀行为。结果表明,铅呈大面积斑点腐蚀,蚀孔小而深。发现酸性土壤中铅的腐蚀率与腐蚀电位有很好的对应关系。铅的腐蚀与土壤PH值、土壤通气性、土壤盐分及土壤微生物有关。     

铅在酸性土壤中的腐蚀行为研究

采用试件自然埋藏的方法研究了铅护套在酸性土壤中1～8年的腐蚀行为。结果表明,铅呈大面积斑点腐蚀,蚀孔小而深。发现酸性土壤中铅的腐蚀率与腐蚀电位有很好的对应关系。铅的腐蚀与土壤PH值、土壤通气性、土壤盐分及土壤微生物有关。     

汽车车轮动平衡测量系统的设计与实现

介绍了车轮动平衡仪的机械结构设计特点、电气部分基本功能及整机的结构框图,同时又介绍了车轮不平衡量的解算方法及动平衡仪复数影响系数的标定方法。该动平衡仪中恰当的应用了数字积分型相关滤波方法,取得了很好的去噪效果。编写了动平衡仪应用软件,通过产品验证了论文内容的正确性,使车轮动平衡仪得到推广应用。     

北斗授时在同步数据采集仪中的应用

为了解决数据采集仪之间远距离同步的问题,提出采取北斗授时和晶振频率误差补偿的方法。首先通过从北斗卫星信号覆盖范围、卫星授时精度、可扩展的用户容限等方面的分析,探讨了北斗授时应用于我国数据采集仪之间同步的可行性;接着介绍了同步数据采集仪的硬件设计,然后分析了晶振频率的偏差对数据采集仪同步性能的影响,并通过软件方法补偿晶振频率的误差;最后通过实际测试结果进行验证。     

ADS8364在新型智能测磁仪中的应用

报告了目前现有测磁仪的技术问题和使用情况,在此基础上提出了一种新型智能测磁仪的研制。介绍了高精度ADS8364和TMS320LF2407的接口技术及部分外设的功能,并采用虚拟仪器设计思想,通过硬件和软件相结合,给出了接口电路及编程方法。单相变压器试品实验证明了设计的正确性。     

脉宽调制技术在CCD光电自准直仪中的应用

为了解决室外环境变化(如温度、雨雪、烟雾及沙尘等)对CCD光电自准直仪测量工作的影响,介绍了一种与CCD曝光时间同步的自动反馈脉宽调制(PWM)数字调控照明光源光强的方法,使光电自准直仪在环境条件变化和整个测角量程范围内,都可获得较高信噪比,保证了系统的测量精度.实验结果表明:环境温度在-40～60℃之间变化时,光电自准直仪在±3 600"全量程范围内具有良好的线性度,分辨率0.2",测量精度±3".表明这一技术有效克服了环境因素对测量稳定性的影响,扩大了CCD光电自准直仪的动态范围,并具有简易可控的优点.     

基于虚拟仪器氨氮在线检测系统研究

针对治理水体富营养化厌氧氨氧化工艺中多参数检测如ph值、氨氮、总磷、总氮、溶解氧等。本系统选用STM32作为处理芯片,结合污水处理工艺特点,实现对温度、PH值和氨氮等指标监控,实现了对多参数水质指标监控。本系统用到了虚拟仪器技术、电化学分析技术、无线通信技术等相关技术,结果表明所采集的数据稳定可靠,满足了厌氧氨氧化工艺中对数据监测要求。     

PECVD制备非晶硅薄膜的研究

实验采用等离子体增强化学气相沉积(PECVD)法在Si衬底上制备了非晶硅薄膜。研究了射频功率、PH3掺杂浓度等因素对薄膜电阻率以及应力的影响。实验结果表明,对于非掺杂非晶硅薄膜,当射频功率从15W增加到45W时,薄膜应力从张应力变化到压应力,在射频功率为35W时,应力几乎为零,应力绝对值先降低后增加,淀积速率随着射频功率的增加而增加;对于掺杂非晶硅薄膜,电阻率随着PH3掺杂浓度的增加而降低,当PH3流量从0cm3/min增加到12cm3/min时,薄膜掺杂效果明显,电阻率降低3个数量级,继续增加PH3流量,电阻率变化较小,而应力随着PH3掺杂浓度的增加而降低,当PH3流量超过12cm3/min时,应力有增加的趋势。     

Passivity-based reinforcement learning control of a 2-DOF manipulator arm

Passivity-based control (PBC) is commonly used for the stabilization of port-Hamiltonian (PH) systems. The PH framework is suitable for multi-domain systems, for example mechatronic devices or micro-electro-mechanical systems. Passivity-based control synthesis for PH systems involves solving partial differential equations, which can be cumbersome. Rather than explicitly solving these equations, in our approach the control law is parameterized and the unknown parameter vector is learned using an actor–critic reinforcement learning algorithm. The key advantages of combining learning with PBC are: (i) the complexity of the control design procedure is reduced, (ii) prior knowledge about the system, given in the form of a PH model, speeds up the learning process, (iii) physical meaning can be attributed to the learned control law. In this paper we extended the learning-based PBC method to a regulation problem and present the experimental results for a two-degree-of-freedom manipulator. We show that the learning algorithm is capable of achieving feedback regulation in the presence of model uncertainties.     

On the first failure time of two-unit systems in two environments

Using semi-Markov processes and PH distribution, we study the first failure time of two-unit systems in two environments, and show that the first failure time distribution is a PH distribution if the repair time distribution is a PH distribution.     

HV/CVD系统Si、SiGe低温掺杂外延

研究了硼烷（B2H6）掺杂锗硅外延和磷烷（PH3）掺杂硅外延的外延速率和掺杂浓度与掺杂气体流量的关系．B浓度与B2H6流量基本上成正比例关系;生长了B浓度直至1019cm-3的多层阶梯结构,各层掺杂浓度均匀,过渡区约20nm,在整个外延层,Ge组分（x=0.20）均匀而稳定．PH3掺杂外延速率随PH3流量增加而逐渐下降;P浓度在PH3流量约为1.7sccm时达到了峰值（约6×1018cm-3）．分别按PH3流量递增和递减的顺序生长了多层结构用以研究PH3掺杂Si外延的特殊性质．     

Application of deterministic annealing EM algorithm to MAP/PH parameter estimation

This paper proposes a variant of EM (expectation-maximization) algorithm for Markovian arrival process (MAP) and phase-type distribution (PH) parameter estimation. Especially, we derive the deterministic annealing EM (DAEM) algorithm for MAP/PH parameter estimation. The DAEM algorithm is one of the methods to overcome a local maxima problem associated with the conventional EM algorithm. This paper derives concrete E- and M-step formulas for MAP parameter estimation from inter-arrival time data and PH parameter estimation from point samples in the framework of DAEM algorithm. Numerical examples demonstrate the DAEM algorithm for Markov-modulated Poisson process (MMPP) and several classes of PH distribution.     

Parametric inference for step-stress models

Applications of the additive accumulation of damages (AAD) or the accelerated failure time (AFT) and the proportional hazards (PH) models in accelerated life testing with step-stresses are discussed. A new model including AAD and PH models is proposed. It is more reasonable than the PH model and wider then the AAD model. Constructing the maximum likelihood function is discussed     

基于数据采集器的虚拟仪器计量技术研究

提出一种便捷的虚拟仪器计量方法,介绍虚拟仪器的基本概念及在硬件平台中技术指标的计量检定方法,其技术指标对测量结果有较大的影响。利用软件产生符合硬件平台技术指标的仿真信号,根据虚拟仪器的软件算法对仿真信号进行处理得到测量结果,对结果进行统计分析得到虚拟仪器的综合性能指标。结果表明,这种方法能够准确地完成对虚拟仪器的计量检定工作。     

制导工具系统误差分离的模型优选方法

对制导工具系统误差分离模型参数优选方法进行了研究。根据制导工具系统误差系数与遥外差之间的关系,误差系数之间的相关性以及遥外差对各项误差的偏导数,综合判定某项误差系数是否应遴选入制导工具系统误差模型,从而克服了传统回归分析方法进行最优模型选择时未充分考虑制导工具系统误差分离应考虑的工程实际。仿真数据处理结果证明了文中方法实现制导工具系统误差模型系数优选的可靠性。     

Optical properties and conductivity of PEDOT:PSS films treated by polyethylenimine solution for organic solar cells

We report on conductivity and optical property of three different types of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) films [pristine PH1000 film (PH1000-p), with 5 wt.% ethylene glycol additive (PH1000-EG) and with sulfuric acid post-treatment (PH1000-SA)] before and after polyethylenimine (PEI) treatment. The PEI is found to decrease the conductivity of all the PEDOT:PSS films. The processing solvent of 2-methoxyethanol is found to significantly enhance the conductivity of PH1000-p from 1.1 up to 744 S/cm while the processing solvent of isopropanol or water does not change the conductivity of PH1000-p much. As for the optical properties, the PEI treatment slightly changes the transmittance and reflectance of PH1000-p and PH1000-EG films, while the PEI leads to an substantial increase of the absorptance in the spectral region of 400–1100 nm of the PH1000-SA films. Though the optical property and conductivity of the three different types of PEDOT:PSS films vary with the PEI treatment, the treated PEDOT:PSS films exhibit similar low work function. We demonstrate solar cells with a simple device structure of glass/low-WF PEDOT:PSS/P3HT:ICBA/high-WF PEDOT:PSS cells that exhibit good performance with open-circuit voltage of 0.82 V and fill factor up to 0.62 under 100 mW/cm² white light illumination.