家用煤气泄漏检测与自动处理系统

如今随着越来越多的家庭开始使用煤气的同时,煤气泄漏引起的事故也日益增多,这严重危害人们的生命与财产安全,煤气泄漏日益成为人们关注的焦点。本设计就是基于STM32单片机的家用煤气泄漏检测与自动处理系统,该系统引入智能家居设计理念,不仅能够实时检测、监控与报警,而且在报警的时候能够把报警信息通过GSM通信模块发送到主人手机上同时可启动厨房排油烟机,将有毒气体排出并关闭煤气阀门。     

基于Arduino家居安防报警系统的设计

采用技术成熟且网络覆盖领域广的GSM技术,结合Arduino单片机技术,设计一款可兼顾实现室内、室外远程报警功能的家居安防监控系统,可对居家盗窃、煤气泄漏、烟雾浓度异常等进行识别并报警。采用Arduino为系统核心,GSM无线通信模块,结合传感器技术实现对人体和有害气体烟雾、煤气等的监控功能。     

基于单片机GSM智能煤气泄漏报警器的硬件模块设计

随着天然气在人们生活中的广泛使用,天然气安全也得到越来越多人的重视。以单片机GSM为核心空间设计的一套智能煤气泄漏报警器通过气数传感器MQ-5系统对煤气泄漏进行检测,监测数据经处理后有液晶1602进行实时显示,一旦检测信息超过报警值就会发出警报,并对煤气阀门实行自动关闭,有效保证居民的人身安全。本文对这类报警器的硬件模块设计进行简单说明。     

无线多点智能报警系统的设计

本文设计一个智能报警系统,将短距离无线传输与GSM远程通信相结合,实现多个房间的远程报警。当监控场所发生紧急情况(盗窃、气体泄漏等)时,通过无线传输模块向主机发送报警信号。主机现场发出声光报警,并通过GSM向户主发送短信息实现远程报警。当有多个房间报警时,在用户短信息中能显示出报警的房间号和报警类型。     

基于GSM的远程PM 2.5空气检测净化装置设计

本文设计了一种基于GSM的远程PM2.5空气检测净化装置,该装置由PM2.5浓度检测模块和空气净化模块两部分组成,可以实时检测空气中的PM2.5浓度。当PM2.5浓度超过系统设定值则通过GSM通信模块发送短信通知用户,让用户选择是否通过串口WIFI模块远程开启空气净化器,从而达到有效监测空气质量并及时通知用户进行改善的目的。     

基于AT89S52单片机的酒精浓度检测短信报警系统

针对如何实现酒精浓度检测的问题,设计了以单片机AT89S52和TC35i GSM模块为核心的酒精浓度检测报警系统。该系统能够完成酒精浓度的检测、语音和手机终端短信报警、数据存储和显示、自动切断汽车点火电路等功能,为及时预防酒驾引起交通事故的发生提供了依据和可能性。实验测试表明:系统具有结构简单、功耗低、操作方便、方便携带等特点。     

转炉煤气回收装置安全性分析

由于转炉煤气相对其他煤气来说具有CO含量高、毒性大,泄漏后易中毒的特点,因而转炉煤气回收装置的安全性与转炉冶炼生产的安全是密不可分的。本文从转炉煤气回收装置入手,对煤气回收装置从设备、工艺和管理角度进行安全性分析,并提出相应的参考建议。     

新型汽车防盗系统设计及研究

提出一种基于DSP TMS320F240的融合GSM技术、传感器技术、视频监控技术和语音报警技术等多方位防盗的方案.主机能够检测多个触发源并进行语音报警,同时通知车主手机,并记录下现场信息.     

基于GSM的儿童安全智能防护系统设计

本文研究设计了一种基于GSM的智能防护儿童安全的装置,其主要由红外探测器、超声波模块、热释电传感器电路、GSM通信模块、信息显示、语音模块、声光警报等模块组成,可有效的掌握装置附近的现场情况。当传感器检测到有人靠近时,系统开始进入警备状态,进入危险警戒线时,开启闪光、语音示警,并在OLED显示屏上提示危险区域请勿靠近。若发生意外,OLED显示屏会自动显示自我急救措施,同时开启GSM通知看护人意外发生的具体地点,避免更严重的后果。     

石油化工装置可燃气体报警系统设计

在石油、化工等装置内,存在着各种可燃/有毒气体(蒸气)。这些气体一旦泄漏并积聚在周围环境中,很容易产生燃烧和爆炸。为了防患于未然,严密监测工艺装置或储运设施环境中可燃气体的浓度,确保安全生产,在装置设计的同时,必须进行可燃气体检测报警系统的设计。通过对国内现行多个标准规范的深入学习,结合多年来从事可燃气体检测报警系统的设计实践和经验,整理编写出如下的可燃气体检测报警系统的设计资料,供同行们参考,以使可燃气体检测报警系统设计更完善。     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.     

Cooler temperatures inductive to locust outbreaks

Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.     

Low doses of a red wine ingredient figh diabetes in mice

Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.     

Rough Justice: A Statistical Assessment of ICANN's Uniform Dispute Resolution Policy

Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP.     

Prevalence of soft neurological signs in Chinese people

Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.     

Molecular motor assembly of a biomimetic system

Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction.     

Monoculture Rubber Plantations Have Negative Ef ects on Controlling Splash Erosion

<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence