EFFECTIVE DECENTRALIZED TITO PROCESS IDENTIFICATION FROM CLOSED‐LOOP STEP RESPONSES

In this paper, a new identification method performed in the time domain based on the decentralized step‐test is proposed for two inputs and two outputs (TITO) processes with significant interactions. In terms of parameter identification, the coupled closed‐loop TITO system is decoupled to obtain four individual single open‐loop systems with the same input signal. As in the SISO case, new linear regression equations are derived, from which the parameters of a first‐ or second‐order plus dead‐time model can be obtained directly. The proposed method outperforms the existing estimation methods for multivariable control systems that use step‐test responses. Furthermore, the method is robust in the presence of high levels of measurement noise. Simulation examples are given to show both effectiveness and practicality of the identification method for a wide range of multivariable processes. The usefulness of the identified method in multivariable process modeling and controller design is demonstrated.     

模态测试与分析软件中的通用文件读写接口设计

介绍了模态分析与测试中常用的各种通用文件格式（UFF），重点分析了最为常用和复杂的UFF58和58b两种数据格式类型。阐述了开发UFF58／58b读写接口的设计方法，并针对读模块特别提出了先扫描后读取的程序设计思想，大大提高了运行效率。同时论述了开发过程的若干关键点。     

一种低压低功耗SRAM/SOI单元设计

提出一种改进4管自体偏压结构SRAM/SOI单元.基于TSUPREM4和MEDICI软件的模拟和结构性能的分析,设计单元结构并选取结构参数.该结构采用nMOS栅下的含p 埋沟的衬底体电阻代替传统6管CMOSSRAM单元中的pMOS元件,具有面积小、工艺简单的优点.该结构可以在0.5V的电源电压下正常工作,与6管单元相比,该单元瞬态响应正常,功耗只有6管单元的1/10,满足低压低功耗的要求.     

容积式油流量计自动检定系统的设计与实现

将先进的计算机自动采集技术和组态技术相结合,设计容积式油流量计自动检定系统。在硬件系统中重点介绍了研华ADAM5000及其接口模块的功能原理、电路连接、模块设置等。在组态设计中重点介绍了组态王在本系统中的组态过程。     

高功率脉冲氙灯的动态PSpice模型研究

根据气体放电相关理论建立高功率脉冲氙灯仿真模型,阐述了放电回路设计的基本原理,采用建立的模型通过计算机对TIL及NIF装置进行仿真,给出了放电回路的仿真结果,与装置运行实际数据比较发现仿真模型及过程可靠,为高功率激光装置的电子计算机辅助设计和分析提供了一种新途径。     

A continuous-flow polymerase chain reaction microchip with regional velocity control

This paper presents a continuous-flow polymerase chain reaction (PCR) microchip with a serpentine microchannel of varying width for "regional velocity control." Varying the channel width by incorporating expanding and contracting conduits made it possible to control DNA sample velocities for the optimization of the exposure times of the sample to each temperature phase while minimizing the transitional periods during temperature transitions. A finite element analysis (FEA) and semi-analytical heat transfer model was used to determine the distances between the three heating assemblies that are responsible for creating the denaturation (96/spl deg/C), hybridization (60/spl deg/C), and extension (72/spl deg/C) temperature zones within the microchip. Predictions from the thermal FEA and semi-analytical model were compared with temperature measurements obtained from an infrared (IR) camera. Flow-field FEAs were also performed to predict the velocity distributions in the regions of the expanding and contracting conduits to study the effects of the microchannel geometry on flow recirculation and bubble nucleation. The flow fields were empirically studied using micro particle image velocimetry (/spl mu/-PIV) to validate the flow-field FEA's and to determine experimental velocities in each of the regions of different width. Successful amplification of a 90 base pair (bp) bacillus anthracis DNA fragment was achieved.     

城镇供水计量的技术特点及发展趋势

城镇自来水公司水流量的计量是提高管理水平和节约用水的荚键环节。介绍了供水行业水计量仪表的应用特点，阐述了电磁流量计等常用流量计的类型和新技术特点，提出了流量计量技术的发展趋势，探讨了以微型计算机和网络技术为代表的新型自动化仪表的关键技术，并指出该技术具有的应用前景。     

Multiresolution free-form deformation with subdivision surface of arbitrary topology

A new free-from deformation method is presented in this paper. Object deformation is controlled by a mesh of arbitrary topology, namely a control mesh. The subdivision surface determined by the control mesh spans an intermediate deformation space. The object is embedded into the space by the nearest point rule. When the shape of the control mesh is changed, the object embedded in the intermediate deformation space will be deformed accordingly. Since the subdivision surface has a multiresolution property, the proposed deformation method naturally has a multiresolution property. A technique for generating control meshes is also introduced in the paper. Compared with previous deformation methods with arbitrary topology control tools, the proposed method has the advantages of flexible control and computational efficiency.     

多生物特征识别

生物特征的识别技术是一门利用人类特有的个体特征来验证个人身份的科学，它与 传统的基于口令和个人身份号码的识别方法相比更加可靠．本文先对各种不同生物特征识别 技术作了简要介绍，然后，介绍了多生物特征识别技术及其工作原理和方法，对生物特征识 别技术的应用前景和发展方向进行了分析．     

监控平台软件与MATLAB的DDE通信

由于动态数据交换DDE（Dynamic Data Exchange)是Windows应用程序问题数据链接的有效方法，本文提出了一咎用MATLAB语言编写S函数的来实现MATLAB和监控平台的DDE通信，然后用基于ON－SPEC监控平台软件的实例说明该方法具有编程简单，容易实现等优点，并且能够实现多输入，多输出模型的动态数据交换。