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ISFET的发展情况国内已有报告。因此,本文仪对一九七五年以后ISFET的发展进行综述。如果说一九七五年前发现了离子敏感场效应管,那么,可以认为是Moss,Janata和Johnson在一九七五年把电化学活性材料(缬氨霉素/PVC)涂到ISFET的栅极表面上形成钾离子选择场效应管,才开创了ISFET的进一步发展基础。同年,Lundstrom等制成的钯栅氢敏场效应管,Shivaramau用氢敏管来探测H_2S, 相似文献
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随着微电子、生物技术的发展,离子敏场效应晶体管(ISFET)生物传感技术已应用于农药检测,并显示出较好的优越性,而我国对基于ISFET的农药检测生物技术研究尚未展开。简单介绍了基于IS-FET的生物传感器的结构、原理,重点探讨了其在农药检测方面的研究应用,分析了ISFET生物传感器存在的问题与未来的发展。 相似文献
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本文介绍为实现带有参比电极的ISFET测量探头微型化而研制成的一种新型探头。采用等离子聚合方法在ISFET敏感栅上覆盖一层聚苯烯薄膜(PPS),使其成为对H~+不敏感的参比场效应晶体管(REFET)。而后采用IC艺,将ISFET,REFET和伪参比电极集成化,得到可用于微量溶液测量的微型探头,将探头中的ISFET和REFET按差分对管方式连接于差放线路中,由于两管对溶液中pH值响应不同,可输出随pH值变化的差模信号。研制的REFET在pH4~pH11范围内几乎无响应,表明了PPS膜具有较少的表面态及良好的H~+掩蔽性。用集成化探头测量pH值,灵敏度可达55mV/pH。 相似文献
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如何实现MATLAB与SPICE仿真分析之间的转换 总被引:5,自引:0,他引:5
结合SPICE与MATLAB仿真软件各自的特点,对它们之间的转换进行研究。通过采用接口软件进行动态连接或嵌入,实现了SPICE与MATLAB之间的转换。较好地解决了在复杂系统仿真分析中,发挥这两种仿真软件的各自优点的问题,从而使系统仿真更具有实用性。 相似文献
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In this study, we propose an analog-digital circuit for sound localization based on the biological auditory system. The proposed
circuit is constructed with a delay line and a comparator. The delay line was constructed with the simple analog circuits
of the current mode. The NOR circuit was used as the comparator. The current mode delay line was evaluated by a simulation
program with integrated circuit emphasis (SPICE). The test circuit was fabricated by discrete metal oxide semiconductor (MOS)
transistors on the breadboard. The result with SPICE and the measured results of the test circuit showed that the time for
transmitting a signal on the current mode delay line becomes shorter when the sound of the target is greater. When the sound
of the target was small, the time taken to transmit the signal became longer. The proposed circuit for sound localization
was evaluated by SPICE. The result with SPICE showed that the circuit can generate a signal to detect the position of the
sound of the target. We can realize a new target-tracking system by applying this novel circuit based on the biological auditory
system to a previously proposed tracking system based on the biological vision system. 相似文献
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模拟电路仿真程序对集成电路设计和电路性能评价具有十分重要的意义。近年来,面向对象技术已成为软件设计的主流思想,以电路仿真系统为背景,给出了一种基于UML的面向对象的分析与设计方法,清楚有效地进行系统建模。这种方法在模拟电路仿真系统SPICE的开发过程中被证明是提高软件开发质量和效率的有效途径。 相似文献
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针对目前云桌面协议存在的因分块机制引起协议视频播放画面不流畅、带宽占用高等问题,在独立计算环境简单协议(SPICE)的基础上提出了一种视频区域侦测算法(VRDA)。首先在云桌面协议播放视频的过程中侦测识别视频播放区域,然后截取视频播放区域的图像为一块完整的视频帧进行处理,最后使用动态图像专家组视频压缩标准(MPEG4)视频压缩算法替换原压缩效率不高的运动静止图像压缩技术(MJPEG)压缩解压视频帧;同时,提出帧期望与实际显示时间差(DAETD)指标作为实验评价指标,来验证改进后SPICE的视频播放流畅度,并测试带宽占用情况。实验表明,所提算法有效提高了视频流畅度,减少了网络带宽占用。 相似文献
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D. H. Kitson 《Software Quality Journal》1996,5(3):145-156
In June 1993, an international effort (SPICE) was launched to develop a standard for software process assessment. An important goal of this effort is to harmonize existing process assessment approaches. This paper describes and characterizes SEI and SPICE software process assessment work and then highlights the similamties and differences. The following aspects are considered-underlying philosophy, goals, scope/domain, rating processes, underlying reference model, tailorability and impact on the international software community. 相似文献
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针对SPICE(SimpleProtocolforIndependentComputingEnvironment)远程桌面视频播放质量问题,文中在原有架构基础上提出一种反馈比较丢帧的策略。该方案首先根据实际网络带宽和SPICE客户端缓冲区占有率之间取舍得到一个最优速率,然后将其反馈至SPICE服务器端,SPICE服务器端根据缓冲区中的数据占有率与反馈值做比值,并根据比较结果采用缓冲区管理方案适当地丢弃视频帧。实验通过在有无权衡因子和缓冲区管理两个方面对视频的传输过程进行验证,结果表明该方案有效地减少了视频延迟,提高了视频流畅度。 相似文献
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Most biological systems are nonlinear but investigators interested in modeling them often make linear approximations to avoid performing tedious manual calculations. SPICE (Simulation Program with Integrated Circuit Emphasis, developed at the University of California, Berkeley, CA), an electrical circuit simulation program, is frequently used for creating and analyzing linear network models of physiologic and pathophysiologic processes. However, few investigators use the full capabilities of the program by modeling nonlinear elements. We developed six nonlinear SPICE elements, allowing simplified modeling of most commonly encountered physiologic processes. These are provided as subcircuits that can be easily incorporated into existing SPICE models. Included are voltage and current controlled nonlinear resistors, capacitors and inductors. In addition, we describe adders, multipliers, powers, inverse, and derivative functions. 相似文献
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针对云桌面协议(Simple Protocol for Independent Computing Environments,SPICE)存在的问题:在用户交互较多的场景显示时延太大、播放视频时可能导致其它操作不能得到及时响应,在原有架构上构建了一个探针通道,根据探针采集反馈结果分别对视频和富交互场景增加了不同的可切换策略。视频场景中,探针采集了其它各个通道的丢包率和时延,综合权重计算出显示通道的带宽上限;富交互场景中,探针采集用户对设备使用的频率,在高频率时通过减少服务端推送时间间隔使显示及时刷新。在不同场景下的测试表明该方法能有效地提升视频和富交互场景下的表现。 相似文献