基于多源信息融合的火灾报警系统设计

针对室外仓库和大型室内仓库等大空间场合,利用多源信息融合决策方法,构造了一个实用的基于多源信息融合的智能型火灾报警系统,该系统采用了多路时分复用技术,将感温探测器、光电感烟探测器和红外CCD图像探测器构成火灾多源探测器组,实现火灾级别的准确预报,实现火灾报警任务,提高火灾报警的可靠性,降低误报率.     

无线报警自锁锁的设计与开发

为了更好地实现对于居民锁以及企业或是银行等单位的安全防范措施,通过无线报警自锁锁的设计以及开发,以更好的满足以上单位的安全性需求。详细阐述了无线报警自锁锁结构设计方案,并详细介绍了其安全防护原理。     

中长焦透射式日盲紫外光学系统设计

日盲紫外系统在导弹告警系统中起着重要的作用,利用光学软件Zemax设计了一款中长焦透射式日盲紫外光学系统。该紫外镜头由6片标准球面透镜构成,适用于240~280nm的日盲紫外波段。根据材料的透过率和色散性,选取正透镜材料为CaF_2,负透镜材料为熔石英。系统的焦距为160mm,F数为3.5,靶面直径为18mm,光学总长为154mm;各视场能量集中度在紫外CCD接收面内均大于85%,光学传递函数20lp/mm处高于0.8,具有成像质量好、结构简单紧凑的特点。     

Author's response

This article contains the author's responses to the five discussion papers commenting on the results presented in Nikiforov (2016 Nikiforov, I. V. (2016). Sequential Detection/Isolation of Abrupt Changes, Sequential Analysis 35: 268–301.[Taylor &; Francis Online] , [Google Scholar]). The quickest detection/isolation of abrupt changes is the generalization of the quickest detection of abrupt changes to the case of M post-change hypotheses. It is necessary to detect the change in distribution as soon as possible and to indicate which hypothesis is true after a change occurs.     

基于ZigBee的语音通信节点的设计与实现

为了能在短距离上实现低成本、低功耗的无线语音通讯,应用ZigBee技术,设计了无线语音通讯方案,可以很好地实现短距离的实时语音通话,并且在不影响通讯质量的情况下,兼顾了成本、功耗的问题,使其能够在较大的范围内得到应用.     

Hidden Markov model based approach for diagnosing cause of alarm signals

When a fault occurs in a process, it slowly propagates within the system and affects the measurements triggering a sequence of alarms in the control room. The operators are required to diagnose the cause of alarms and take necessary corrective measures. The idea of representing the alarm sequence as the fault propagation path and using the propagation path to diagnose the fault is explored. A diagnoser based on hidden Markov model is built to identify the cause of the alarm signals. The proposed approach is applied to an industrial case study: Tennessee Eastman process. The results show that the proposed approach is successful in determining the probable cause of alarms generated with high accuracy. The model was able to identify the cause accurately, even when tested with short alarm sub-sequences. This allows for early identification of faults, providing more time to the operator to restore the system to normal operation.     

炼油厂循环水漏油报警器的开发及应用

利用浊度法测定水中的油含量，研制了一种用于循环水系统的漏油报警器。该报警器可进行多点控制，及时发现水中的漏油情况，迅速查出漏油点。通过现场的实际应用，证明该报警器快捷、简便、准确度高。     

一种自动保护报警系统的设计与应用

介绍干法晴纶生产中一种自动保护报警系统的设计与应用，通过它实现氧含量联锁系统的正常运行。     

Alpha-acaridial a female sex pheromone from an alarm pheromone emilting mite Rhizoglyphus robini

The female sex pheromone of Rhizoglyphus robini Claparède (Astigmata: Acaridae) was identified as -acaridial [2(E)-(4-methyl-3-pentenyl)- butenedial], which stimulated males sexually and enhanced the frequency of male mounting behavior. Although a hexane extract of females manifested alarm pheromone activity against tested males due to the presence of the alarm pheromone neryl formate, silica gel column fractions containing -acaridial evoked increased mounting behavior by males at a dose of 0.1 female equivalent. Synthetic -acaridial at a dose of 10 ng showed a peak of activity as a sex pheromone, with a convex dose–response relationship. Its content was determined to be 388 ± 244 ng per female and 163 ± 97 ng per male by GC. This is the first time that two pheromones (the alarm pheromone neryl formate, and the sex pheromone -acaridial) have been demonstrated to be components of the same opisthonotal gland secretion in astigmatid mites. A mechanism for the appropriate expression of the two pheromones by the mites under different conditions is proposed.     

Mandibular Gland Secretion of <Emphasis Type="Italic">Melipona beecheii</Emphasis>: Chemistry and Behavior

The mandibular gland secretion of Melipona beecheii contains a rich mixture of terpenoid and oxygenated compounds and unsaturated and saturated hydrocarbons. However, it differs markedly from the 11 other Brazilian species examined in previous studies, both by the absence of 2-heptanol and the presence of rose oxides. The most abundant compound was geranyl hexanoate, whereas the most volatile compounds were cis- and trans-rose oxide and geraniol. The complete blend and five individual components found in the gland secretion were tested by electroantennography (EAG) and behavioral assays. The complete mandibular gland extract and geraniol elicited the strongest EAG responses, whereas these and farnesyl acetate induced the strongest attack response from workers. The role of the rose oxides remains to be elucidated, as they do not appear to play a major role as an alarm pheromone of this species.