基于虚拟仪器和MSP430单片机的数据采集系统的开发

利用虚拟仪器技术和MSP430F149单片机丰富的片内资源,开发了一种数据采集系统.以MSP430F149单片机为核心设计了系统的数据采集模块、存储模块、串行通讯模块以及电源模块;在定义上下位机间通讯协议的基础上.采用LabVIEW对系统的上位机软件进行了开发;结合MSP430F149单片机的ADC12模块和USART...     

MSP430单片机Timer＿A的应用

MSP430单片机是TI公司推出的一款超低功耗16位微控制器,MSP430的Timer_A功能强大,使用方便,在应用系统的设计中有重要的作用。介绍了Timer_A的组成、工作原理,对Timer_A的具体应用进行了讨论。     

基于SOC单片机的模糊温度测控系统设计

提出一种基于SOC单片机的模糊温度测控系统的设计方案。采用SOC型单片机MSP430F149为控制核心,利用MSP430F149片内资源,实现温度采集信号的放大、ADC转换处理、PWM驱动控制等功能,以最小的硬件结构完成模糊温度闭环控制。同时,应用RS-485通讯协议,实现上位机与底层控制节点之间可靠的数据通讯。     

基于MSP430F5438单片机的交流电压测量

介绍了一种基于MSP430F5438单片机测量交流电压有效值的一种方法。给出了系统硬件原理图,介绍了系统的软件设计思想及设计代码。     

论煤气计费系统的硬件设计

提出了基于TI公司MSP430系列单片机的遥控煤气表的设计思想,分别给出了软硬件设计及实现方案,并讨论了系统的低功耗以及最终运行效果。提出了以TI公司MSP430系列MCU为基础的IC卡煤气表的设计思想,给出了总体设计、硬件电路设计、软件流程设计及主要模块的编程框架,讨论了低功耗问题。同时,对IC卡煤气表设计中一些应注意的问题也进行了简要的阐述。     

一种用于时差法超声波热能表的高精度测时方法

介绍了时差法超声波热能表检测流量原理,阐述了由德国ACAM公司的高精度时间测量芯片TDC-GP2和16位超低功耗单片机MSP430F413组成的高精度测量电路的硬件及软件设计.详细分析了高精度测量技术与高精度测量原理,最后提出了一种提高时差法测量精度的方法--Ⅱ型管技术.     

基于MSP430单片机的电力系统谐波监测研究与设计

针对电力系统中谐波监测问题,提出了一种基于MSP430单片机实现小波变换,采对电力系统中Rogowski线圈采集电流信号的谐波分析与研究.系统通过430F449内部自带的ADC12模块实现采集信号,采用软件实现小波多分辨分解、实时的显示基波以及谐波信号的有效值.     

基于WSN RFID技术的水泥样品无线测控装置设计

为实现水泥样品的智能化管理,采用WSN RFID技术,以MSP430F149单片机为核心,配以状态监控模块、无线通信模块、声光指示报警模块,设计了水泥无线测控装置.该装置具有实时测控样品的状态、自动识别水泥样品、存储检验数据和超限报警的功能,能实现水泥实验室样品管理的实时监控和可追溯.     

基于光敏技术的点光源跟踪系统的设计

本系统以MSP430F4270单片机为控制核心,用光敏电阻作为光源检测传感器,舵机构成执行机构,以舵机驱动激光笔水平或上下移动;由单片机根据光源传感器的信号,采用PID算法输出PWM波控制舵机带动激光笔指向光源.     

基于无线传输技术的继电器电寿命试验技术

为实现继电器电寿命试验中的无线数据传输,降低检测成本,利用MSP430F149单片机结合CC2530无线射频芯片,研制了无线传输系统。系统可以实时检测继电器触点电压等参数,并进行智能判断、控制试验时序,完成继电器电寿命的检测。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。