PA1688双核处理器的电视播放故障监控系统设计

针对数字电视故障监控中常出现的间距,提出一个采用低成本的双核（MCS51＋DSP）处理器的解决方案,并给出软硬件设计方法。该方案不但能对文中提出的几类故障进行监控,而且经过软件升级后,能对大部分的故障进行监控和处理,满足数字电视发展过程中日益增长的需求。     

浅谈我公司真空制盐装置扩能的技改措施

本文介绍了中盐榆林盐化有限公司2006年实现200kt/a产能的技改措施。分别从装置的潜能、技改的依据、技改的实施方案以及技改的效果,全面总结了本次技改的经验。     

A Study of Schemes for Internet Data Transmission Based on CATV Networks

1　ＴｈｅＣａｕｓｅｏｆｔｈｅＰｒｏｂｌｅｍＴｈｅＣＡＴＶｎｅｔｗｏｒｋｈａｓｂｅｅｎｄｅｖｅｌｏｐｅｄｒａｐｉｄｌｙｉｎｔｈｅｐａｓｔｆｅｗｙｅａｒｓ.Ｂｙｔｈｅｅｎｄｏｆ 1 998,ｔｈｅｃｏｎ ｓｕｍｅｒｓｈａｄｒｅａｃｈｅｄ 6 70ｍｉｌｌｉｏｎ ,ａｎｄｂｙｔｈｅｅｎｄｏｆｌａｓｔｃｅｎｔｕｒｙ ,ｔｈｅｃｏｎｓｕｍｅｒｓｒｅａｃｈｅｄ 85 0ｍｉｌｌｉｏｎ .Ｍｏｒｅｏｖｅｒ,ｔｈｅｎｕｍｂｅｒｏｆｃｏｎｓｕｍｅｒｓｗｉｌｌｂｅｍｏｒｅｔｈａｎ 1 0 0 0ｍｉｌｌｉｏｎ ,ａｎｄｔｈｅＣＡＴＶｎｅｔｗｏｒｋｗ…     

Effect of current collector corrosion made from printed circuit board (PCB) on the degradation of self-breathing direct methanol fuel cell stack

Adopting printed circuit board (PCB) as the current collector for direct methanol fuel cell (DMFC) is a promising task. This paper found that the combinational 10 μm Ni/2 μm Au coatings on PCB could not endure halide attacking in its anodic polarization. With this coated PCB, the self-breathing DMFC stack with passive methanol supply exhibited progressively degradation in its lifetime test. By using a series of measurements, it is shown that initial corrosion would not obviously influence stack degradation, but the subsequently inter-facilitation, between F⁻ originating from Nafion membrane and corrosion products of Ni²⁺ and Cu²⁺ from PCB, would result in serious degradation, the final stack invalidation would present accompanied with the loss of membrane conductivity. The defects on coated PCB are crucial to initiate localized corrosion and stack degradation. Although cyclic voltammetry (CV) technology is effective to recover cell temporarily, its damage by releasing F⁻ should be further evaluated.     

Application of the IWA anaerobic digestion model (ADM1) for simulating full-scale anaerobic sewage sludge digestion.

A steady-state implementation of the IWA Anaerobic Digestion Model No. 1 (ADM1) has been applied to the anaerobic digesters in two wastewater treatment plants. The two plants have a wastewater treatment capacity of 76,000 and 820,000 m3/day, respectively, with approximately 12 and 205 dry metric tons sludge fed to digesters per day. The main purpose of this study is to compare the ADM1 model results with full-scale anaerobic digestion performance. For both plants, the prediction of the steady-state ADM1 implementation using the suggested physico-chemical and biochemical parameter values was able to reflect the results from the actual digester operations to a reasonable degree of accuracy on all parameters. The predicted total solids (TS) and volatile solids (VS) concentration in the digested biosolids, as well as the digester volatile solids destruction (VSD), biogas production and biogas yield are within 10% of the actual digester data. This study demonstrated that the ADM1 is a powerful tool for predicting the steady-state behaviour of anaerobic digesters treating sewage sludges. In addition, it showed that the use of a whole wastewater treatment plant simulator for fractionating the digester influent into the ADM1 input parameters was successful.     

锌离子对菖蒲的胁迫反应研究

采用水培法,以Hoagland溶液为基础培养液,研究Zn2+胁迫对菖蒲幼苗生长状况、细胞渗透性、过氧化物酶(POD)活性、超氧化物歧化酶(SOD)活性、叶绿素以及脯氨酸质量比的影响。结果表明,Zn2+胁迫下菖蒲幼苗生长受到严重影响;随着Zn2+质量比的增加,叶片电导率不断增大;POD、SOD活性均高于对照,并且呈现先升高后降低的正相关趋势;叶绿素的质量比显著降低,与Zn2+质量比呈负相关趋势;脯氨酸质量比则一直呈上升的变化趋势。研究结果说明,酶活性的升高是由于菖蒲对Zn2+胁迫做出的应激反应,而高质量比Zn2+却对菖蒲的保护酶活性有抑制作用。     

2006年泰国橡胶生产出口情况及2007年预测

泰国是世界上主要的橡胶生产国之一,全国76个府中有52个府种植橡胶,近几年的种植面积在200万～230万公顷左右,约占其国土总面积的5%,种植面积在世界排名第二,仅次于印度尼西亚。传统的橡胶种植区主要分布在南部和中部,近年来逐     

Study on the influence of albedo on building heat environment in a year-round

The research of energy saving is one of the highlights of buildings environment. According to the albedo change of the wall-facing materials of urban buildings, two building models were constructed, of which the internal and external microclimate parameters were measured under certain meteorological conditions in different seasons. The experimental results show that the decrease of indoor air temperature was up to 4.67 °C with the average diurnal temperature decrease up to 3.53 °C in summer, and the increase was up to 2.81 °C in winter when the albedo changed from 0.21 to 0.86. Moreover, Laplace integral transform method was used to analyze building energy saving. The results indicate that the wall-facing materials with high albedo have the function of heat-protection and heat-insulation and could reduce 150.3 W per day of the buildings’ cooling load in summer and 69.5 W per day of heating load in winter. The research results confirm that employing high albedo coatings on the building exterior wall is an active and effective approach to improve the urban buildings’ micro-heat environment.     

一种交错并联电路的控制部分设计

本文介绍了UC3846的工作原理，设计了一种采用晶振、反相器、脉冲计数器与UC3846一起产生频率的交错并联控制电路。