基于压电免疫传感器的日本血吸虫病诊断仪

日本血吸虫病诊断仪是一种便携的日本血吸虫病早期的诊断仪器.它将基于石英晶体振荡器的质量检测技术的压电免疫传感器应用于日本血吸虫病的病情检测,在此基础上设计了压电免疫传感器振荡电路.基于DSP的信号处理系统对压电免疫传感器的频率响应信号进行检测和分析,提取压电免疫传感器输出的特征信号并与阈值作比较,从而实现早期日本血吸虫病诊断.实验表明:日本血吸虫病诊断仪可以对日本血吸虫病做出定性诊断,其识别率≥92.1%.     

结合PAH聚电解质和纳米金界面的压电免疫传感器研究

提出了一种聚丙烯氯化铵(PAH)-纳米金固定抗体的压电免疫传感器界面的构建方法.先在压电石英晶振的金电极表面自组装一层半胱氨酸单层膜,通过戊二醛交联带大量NH2基的聚电解质PAH,随后在PAH膜表面自组装一层纳米金粒子,以静电吸附作用固定IgG抗体,研制成一种新的压电免疫传感器的界面,用于对相应抗原的检测.研究了PAH浓度及抗体固定化等实验条件的影响,探讨了传感器的主要响应特性与再生性能,并与戊二醛直接固定的传感器的性能进行了比较.结果表明,前者固定的抗体的活性较高,响应频率较大,检测的线性范围较宽,非特异性吸附小,能有效地改善传感器的灵敏度和检测限,而且容易进行传感器的再生.     

双晶片悬臂梁式压电传感器的有限元仿真研究

压电传感器作为一种便捷、高效的传感器类型,越来越受到人们的青睐.为研究压电传感器机电耦合能力,将压电高聚物聚偏氟乙烯(PVDF)黏结而成的压电双晶片悬臂梁作为研究对象,利用有限元分析软件ANSYS Workbench,首先完成对模型的构建和模态分析,得出模型的固有频率和固有振型,再建立压电材料的压电本构方程,对压电双晶片悬臂梁模型发电量进行模拟仿真,最后将仿真结果与前人研究结果相对比.分析得出:在10 mm的形变量下,能够产生最大320 V左右的瞬时电压,这与前人的研究结果相近,验证了仿真结果的准确性,同时也证实了压电双晶片悬臂梁作为压电传感器的可行性.     

压电传感器与前置放大器的配接

从提高传感器和测量电路的灵敏度出发,根据压电传感器压电元件串联和并联2种连接方式,电压放大器和电荷放大器2种前置电路的特点,对压电传感器与前置电路如何配接进行研究。提出了压电元件串联应配接电压放大器,压电元件并联应配接电荷放大器。当压电传感器与测量电路之间的距离较远时,宜采用后一种方式。此方法具有实际的指导意义。     

压电免疫传感器的研制及应用

介绍了压电免疫传感器的压电质量传感原理、免疫反应及压电免疫传感过程。同时将该传感器成功地应用于牛血滑白蛋白的检测．     

水诱导相分离法制备的P VDF柔性压电传感器

介绍了一种利用水诱导相分离促使普通PVDF转变成压电高分子的方法,并利用红外吸收光谱和Ｘ射线衍射对其 进行表征和分析, 在压电器件部分,测试了该材料制作的压电传感器的稳定性、线性偏差和响应时间。测试结果表明,该方法制备的PVDF传感器具有良好的稳定性,线性度良好?偏差在±５％以内,灵敏度为0.27Ｖ/kPa,响应迅速,完全响应时间为200ms,在应用部分,将该材料制成的传感器阵列成功应用于羽毛球拍,实现了羽毛球在球拍上击打的位置和力度的检测,并通过蓝牙实时传输至电脑,并在电脑上进行直观显示和记录, 这一使用场景证明了PVDF柔性压电传感器将为可穿戴设备和智能硬件的发展带来更多的可能。     

Tonpilz型压电陶瓷超声传感器的设计

超声传感器是一种电声转换器件,其敏感元件压电陶瓷控制传感器的主要性能。设计了一种谐振频率为140 kHz的Tonpilz型压电陶瓷超声传感器,从压电方程入手,建立了不同的理论模型,对等效网络法和有限元法2种不同的设计方法进行了比较。相应的试验表明:有限元法的分析结果直观明了、建模快捷、分析准确,其误差可控制在5%以内。设计研制的Tonpilz型传感器工艺简单、造价低廉、性能稳定。     

纳米金结合银增强用于质量放大压电免疫传感器的设计

提出了一种基于纳米金结合银增强的质量放大方法以提高压电免疫传感器的灵敏度.通过夹心法将纳米金引入传感器表面后滴加银增强试剂,在纳米金的催化下可使银沉积在传感器上,从而对免疫反应引起的质量变化进行放大.以检测正常人IgG为例,对该方法的可行性作了研究,设计的传感器可在0.3～5μg/mL范围内实现对正常人IgG的定量检测.     

基于巯基化合物和纳米金自组装技术固定化方法的研究

该文提出了一种压电免疫传感器新的蛋白的固定化方法.先在压电石英晶体电极表面自组装半胱氨酸,再通过纳米金与氨基的共价键合作用,在巯基自组装膜的氨基表面形成一均匀的纳米金单层膜,实现蛋白质分子(抗IgG)在传感器表面的固定.探讨了半胱氨酸自组装及IgG抗体固定等一系列实验条件及参数对传感器性能的影响.传感器的频率响应和IgG的浓度在0.33～98.91μg/mL范围内具有良好的线性关系.在0.5 mol/LNaCl+0.01 mol/L NaOH溶液中,蛋白质层可容易地被洗脱,使免疫传感器获得再生.     

直升机桨叶阵列式压电模态传感器的故障诊断

提出了一种基于加权系数的直升机桨叶阵列式压电模态传感器的故障诊断方法。以直升机桨叶为例，以圆形锆钛酸铅(PZT)压电陶瓷作为压电传感单元。将实验曲率模态作为加权系数设计阵列式压电模态传感器，对PZT在使用过程中易出现的破损和脱层故障进行了实验研究。实验结果表明，基于加权系数的阵列式压电模态传感器的故障诊断方法能对压电阵列中的损伤单元进行准确地定位，且其诊断结果具有很高的置信度；所提出的损伤因子可在一定损伤范围内作为损伤程度的指示参数。     

一种新的报文摘要(MDC)生成算法

为实现电子商务活动中信息的鉴别，提出了一种适合各种语言信息的报文摘要生成算法，其强度可以根据不同的需要进行调整，并对算法进行了实例验证，从理论和实践上证明了这种算法的可靠性与正确性。无论是软件还是硬件都很容易实现，运算速度快，可以广泛应用于电子商务活动中的报文摘要生成。对我国电子商务的发展具有一定的实际意义。     

Game theory approach to finite-time horizon optimal estimation

In this game, a measurement record is given and the first player looks for the best estimate of a prespecified combination of the system states in the presence of a hostile process noise signal and system initial condition that are applied by his adversary. It turns out that the game possesses a saddle-point solution which leads to an optimal smoothed estimate that is identical to the corresponding L₂-optimal estimate. A similar game in which the estimate is restricted to be causal is formulated and solved. This game provides, for the first time, a saddle-point equilibrium interpretation to finite-time H_∞-optimal filtered estimation. The two games are very closely related. It is shown that in the first game the first player's strategy, which is the optimal smoothed estimate, is a linear-fractional transformation of the H_∞-optimal filter which applies a nonzero free contracting Q parameter. It, therefore, achieves a unity H _∞-norm bound for the operator that relates the exogeneous signals to the estimation error     

An algorithm for the multiinput eigenvalue assignment problem

A very simple and inexpensive algorithm is presented for pole placement in the multiinput case. The algorithm consists of orthogonal reduction to a Block-Hessenberg form and a simple linear recursion. It yields a matrix F such that A+BF has any specified set of eigenvalues whenever the system is controllable. It is extremely easy to program on a computer. The algorithm is not a robust pole-placement algorithm but appears to give comparable results in most well-conditioned cases at a fraction of the cost. It is a direct (noniterative) algorithm and no eigenvalues or singular values are computed. The algorithm does not need any complex arithmetic, even when complex conjugate eigenvalues need to be assigned     

Generalized measures of fault tolerance in n-cube networks

It is shown that for a given p (1<p⩽n ), the n-cube network can tolerate up to p2^(n-p)-1 processor failures and remains connected provided that at most p neighbors of any nonfaulty processor are allowed to fail. This generalizes the result for p=n-1, obtained by A.-M Esfahanian (1989). It is also shown that the n-cube network with n⩾5 remains connected provided that at most two neighbors of any processor are allowed to fail     

Simple algorithms and architectures for B-spline interpolation

It is proved that the Toeplitz binary value matrix inversion associated with mth-order B-spline interpolation can be implemented using only 2(m+1) additions. Pipelined architectures are developed for real-time B-spline interpolation based on simple running average filters. It is shown that an ideal interpolating function, which is approximated by a truncated sinc function with M half cycles, can be implemented using B-splines with M+2 multiplies. With insignificant loss of performance, the coefficients at the knots of the truncated sinc function can be approximated using coefficients which are powers of two. The resulting implementation requires only M+4m+6 additions. It is believed that the truncated sinc function approximated by zero-order B-spline functions actually achieves the best visual performance     

CAREL: computer aided reliability evaluator for distributedcomputing networks

An efficient method to compute the terminal reliability (the probability of communication between a pair of nodes) of a distributed computing system (DCS) is presented. It is assumed that the graph model G(V,E) for DCS is given and that the path and/or cut information for the network G(V,E) is available. Boolean algebraic concepts are used to define four operators: compare, reduce, combine, and generate. The proposed method, called CAREL, uses the four operators to generate exclusive and mutually disjoint events. CAREL has been implemented using bit vector representation on an Encore MULTIMAX 320 system. It is shown that CAREL solves large DCS networks (having a pathset on the order of 780 and a cutset on the order of 7300 or more) with a reasonable memory requirement. A comparison with other algorithms reveals the computational efficiency of the method. The proof of correctness of CAREL is included     

Parallel binary search

Two arrays of numbers sorted in nondecreasing order are given: an array A of size n and an array B of size m, where n<m. It is required to determine, for every element of A, the smallest element of B (if one exists) that is larger than or equal to it. It is shown how to solve this problem on the EREW PRAM (exclusive-read exclusive-write parallel random-access machine) in O(logm logn/log log m) time using n processors. The solution is then extended to the case in which fewer than n processors are available. This yields an EREW PRAM algorithm for the problem whose cost is O(n log m, which is O(m)) for n⩽m/log m. It is shown how the solution obtained leads to an improved parallel merging algorithm     

位置灵敏探测器的数据采集系统设计与实现

介绍位置灵敏探测器数据采集系统的设计与实现。该系统由两片或三片微通道板、位置读出阳极以及数字化处理系统模块构成,具有较高的数据获取速度和灵活性。在微型计算机的支持下,系统的每个数据获取通道相当于一个微机多道分析器,可以根据实验需要的通道数很方便地组合数据获取通道,特别适用于一维或二维的位置探测。通过对系统性能进行测试,得到了很好的结果。目前,该数据获取系统已经成功地应用于（ｅ,２ｅ）实验。     

利用EJB构造电子商务平台

EJB(Enterprise Java Bean) 是一种创建在服务端的可扩展、事务处理的、多用 户安全的企业级应用，它为开发分布式的N-Tier中间件提供了统一的组件结构框架。 利 用这种技术设计出运行在J2EE服务器上通用的电子商务平台，展示了开发网上商店的具体流 程，是EJB技术很典型的一个应用。