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半导体生物培养箱的研制
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作者 张珂铭 许丽佳 +3 位作者 尹新建 鲍琦 孙磊 张开恒 《农机化研究》 北大核心 2011年第3期108-112,共5页
研制了一种利用半导体作为温控元件的生物培养箱。利用半导体体积小、传热速度快以及无噪声等优点,尝试将其作为生物培养箱的温控元件,并利用ARM开发板进行核心程序的设计,且使用液晶触摸屏进行温、湿度的实时监测,使得设计出的培养箱... 研制了一种利用半导体作为温控元件的生物培养箱。利用半导体体积小、传热速度快以及无噪声等优点,尝试将其作为生物培养箱的温控元件,并利用ARM开发板进行核心程序的设计,且使用液晶触摸屏进行温、湿度的实时监测,使得设计出的培养箱具有人机界面友好、操作简单等优点,并通过实验验证其具有良好的控制效果。 展开更多
关键词 半导体 生物培养箱 传感器 微控处理器
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Co-design for an SoC embedded network controller 被引量:4
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作者 ZOU Lian-ying ZOU Xue-cheng 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第4期591-596,共6页
With the development of Ethernet systems and the growing capacity of modem silicon technology, embedded communication networks are playing an increasingly important role in embedded and safety critical systems. Hardwa... With the development of Ethernet systems and the growing capacity of modem silicon technology, embedded communication networks are playing an increasingly important role in embedded and safety critical systems. Hardware/software co-design is a methodology for solving design problems in processor based embedded systems. In this work, we implemented a new 1-cycle pipeline microprocessor and a fast Ethemet transceiver and established a low cost, high performance embedded network controller, and designed a TCP/IP stack to access the Intemet. We discussed the hardware/software architecture in the forepart, and then the whole system-on-a-chip on Altera Stratix EP1S25F780C6 device. Using the FPGA environment and SmartBit tester, we tested the system's throughput. Our simulation results showed that the maximum throughput of Ethemet packets is up to 7 Mbps, that of UDP packets is up to 5.8 Mbps, and that of TCP packets is up to 3.4 Mbps, which showed that this embedded system can easily transmit basic voice and video signals through Ethemet, and that using only one chip can realize that many electronic devices access to the Intemet directly and get high performance. 展开更多
关键词 System-on-Chip (SoC) EMBEDDED MICROPROCESSOR Network controller TCP/IP CO-DESIGN
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Gastric electrical stimulation for gastroparesis:A goal greatly pursued,but not yet attained 被引量:4
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作者 Mauro Bortolotti 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第3期273-282,共10页
The lack of an effective medical treatment for gastroparesis has pushed the research of new techniques of gastric electrical stimulation (GES) for nearly half a century of experimentation with a large variety of elect... The lack of an effective medical treatment for gastroparesis has pushed the research of new techniques of gastric electrical stimulation (GES) for nearly half a century of experimentation with a large variety of electrical stimuli delivered to the gastric wall of animals and patients with gastroparesis. Three principal methods are currently available: gastric low-frequency/high-energy GES with long pulse stimulation, high-frequency/low-energy GES with short pulse stimulation and neural sequential GES. The first method aims to reset a regular slow wave rhythm, but has variable effects on contractions and requires devices with large and heavy batteries unsuitable for implantation. High-frequency/low-energy GES, although inadequate to restore a normal gastric electro-mechanical activity, improves dyspeptic symptoms, such as nausea and vomiting, giving patients a better quality of life together with a more satisfactory nutritional status and is suitable for implantation. Unfortunately, the numerous clinical studies using this type of GES, with the exception of two, were not controlled and there is a need for definitive verification of the effectiveness of this technique to justify the cost and the risks of this procedure. The last method, which is neural sequential GES, consists of a microprocessor-controlled sequential activation of a series of annular electrodes along the distal two thirds of the stomach and is able to induce propagated contractions causing forceful emptying of the gastric content. The latter method is the most promising, but has been used only in animals and needs to be tested in patients with gastroparesis before it is regarded as a solution for this disease. 展开更多
关键词 Gastric electrical stimulation Gastric emptying Gastric motility Gastric myoelectric activity GASTROPARESIS Prokinetic drugs
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A RESEARCH TO HIGH-PERFORMANCE MULTI-LEVEL SINGLE-PHASE AC/DC POWER FACTOR CORRECT SWITCHING CONVERTER
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作者 Gao Chao 《Journal of Electronics(China)》 2008年第5期716-720,共5页
This letter studies and analyzes the working features of main circuit of tri-level boost Power Factor Correct(PFC) converter and the advantages of tri-level switch converter in aspects of bearing high-voltage of power... This letter studies and analyzes the working features of main circuit of tri-level boost Power Factor Correct(PFC) converter and the advantages of tri-level switch converter in aspects of bearing high-voltage of power components,overall system loss and magnetic component selection based upon the single-level boost PFC switch converter.Besides,relying on the application of mi-croprocessor in power converter technology and DSP(Digital Signal Processing) chip's strong cal-culating capacity,the letter presents the adoption of modified scheme of tri-level boost PFC converter under the control of predictive control algorithm.Moreover,the operating principle and control method are specified,the results of circuit test and analysis are provided and the advantages of pre-dictive control technology-based multi-level boost PFC converter is verified. 展开更多
关键词 MULTI-LEVEL Power Factor Correct (PFC) Digital Signal Processing (DSP) Converter Predictive control MICROPROCESSOR
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