Use of a sex attractant and an inhibitor for monitoring winter moth and bruce spanworm populations

A single sex pherormone component was isolated from abdominal tip extracts of female Bruce spanworm.Operophtera bruceata (Hulst). This was identified as (Z,Z,Z)-1,3,6,9-nonadecatetraene by capillary gas chromatography (GC), electroantennography, and mass spectrometry. In addition, hexane extracts of female abdominal tips from Bruce spanworm and the winter moth.O. brumata L., were analyzed by GC coupled to an electroantennographic detector (GC-EAD). The extracts ofO. bruceata andO. brumata females elicited only a single response, at the same retention time, from antennae of their conspecific and reciprocal males. In field tests conducted in Saskatchewan, traps baited with the synthetic tetraene captured Bruce spanworm males. In tests carried out on Vancouver Island, British Columbia, where the two species coexist, both Bruce spanworm and winter moth males were captured. The attractancy of lures containing the synthetic pheromone alone and in combination with several structurally related analogs was field tested at both locations. One of these, an isomer of the natural pheromone, (E,Z,Z)-1,3,6,9-nonadecatetraene, inhibited the capture of Bruce spanworm males but had no effect upon the number of winter moth males which were taken. Thus, populations of these two very similar species can be distinguished by employing traps baited with pheromone ± the inhibitor. Coneorifice Hara traps were found useful for field trapping males of both species.Issued as NRCC No. 26107     

Intel SoC处理器的I~2C总线IP核设计与应用

Intel SoC处理器E6x5C系列产品,作为多芯片的封装芯片,具有出色的灵活性。本文基于该处理器,利用Altera新一代集成开发工具Qsys,描述了I2 C总线IP核的设计过程,给出了IP核的系统接口和各个子模块的设计方法,并进行仿真和验证,最后将该IP核应用于模拟视频解码芯片SAA7113的配置及初始化。     

Sex pheromone of the mullein bug,Campylomma verbasci (Meyer) (Heteroptera: Miridae)

The first known sex pheromone for the family Miridae is reported for the mullein bug,Campylomma verbasci (Meyer) (Heteroptera: Miridae). Extracts of and Porapak Q-trapped volatiles from females were attractive to males in field bioassays. Butyl butyrate and hexyl butyrate were the predominant compounds in the females' volatiles, but these compounds previously had been found to be inactive when released alone or in combination. Butyl butyrate in combination with an isolated trace chemical, (E)-crotyl butyrate (which was inactive alone), rivaled the attraction elicited by five live females. When synthetic butyl butyrate and (E)-crotyl butyrate in a 16: 1 ratio were released at 91 or 183 g/day, they comprised an effective attractant for male bugs.     

Synthesis and densification of magnesium aluminate spinel: effect of MgO reactivity

Stoichiometric magnesium aluminate spinel was synthesized by reaction sintering of alumina with caustic and sintered magnesia. The volume expansion of 5–7% during MgAl₂O₄ formation was utilized to identify the starting temperature of spinel formation and densification by high temperature dilatometry. The magnesia reactivity was determined by measurement of crystallite size and specific surface area. Caustic magnesia and sintered magnesia behave differently vis-à-vis phase formation and densification of spinel. Densification of stoichiometric Mag-Al spinel was carried out between 1650 and 1750 °C. Attempts were made to correlate the MgO reactivity with microstructure and densification of spinel.     

Temporal aggregation and spurious instantaneous causality in multiple time series models

Large aggregation interval asymptotics are used to investigate the relation between Granger causality in disaggregated vector autoregressions (VARs) and associated contemporaneous correlation among innovations of the aggregated system. One of our main contributions is that we outline various conditions under which the informational content of error covariance matrices yields insight into the causal structure of the VAR. Monte Carlo results suggest that our asymptotic findings are applicable even when the aggregation interval is small, as long as the time series are not characterized by high levels of persistence.     

基于Visual C++的Pro/E组件的二次开发

应用Pro/E软件的组件环境对产品进行自顶而下修改,进而生成新模具是新产品设计的重要方式.而Pro/E自身组件模式下的尺寸修改功能效率低,以Visual C++为工具对Pro/E进行与尺寸修改对话框类似的"尺寸收集修改器"的二次开发,可实现组件模式下新产品的快速设计.     

美军RMS试验与评价的做法与启示

武器装备RMS试验与评价是提高装备的战备完好性、提升我军装备作战性能的重要手段。本文引进了美军在RMS试验与评价方面先进的理论,分别分析了RMS试验与评价的过程、内容、组织机构和特点。最后结合我军的实际情况,总结了我军在RMS试验与评价方面的一些问题,并得出了几点启示,对我军今后开展装备RMS试验与评价工作提供借鉴和参考。     

中西体育文化比较研究

在对中西体育文化渊源进行比较分析的基础上,阐述了中西体育文化观念上的差异,并提出了中西合璧,构建现代奥运精神的设想。     

基于PSS/EBKDY模块的短路电流周期分量计算方法分析

介绍了一种基于电网仿真软件PSS／EBKDY模块的短路电流周期分量计算方法,分别用PSS／E和BPA机电暂态仿真软件对计算结果进行了校核．仿真结果显示,基于PSS／EBKDY模块的短路电流算法有较好的精确度,但该算法的缺点是不够保守,这将影响其在工程短路电流计算上的应用．     

风力发电机电磁场谐波分析及槽配合选择

在电机设计中槽配合的选择尤为重要,这其中就涉及到谐波分析,对双速交流电机电磁场谐波进行了数理分析,并建立了模型,其中齿谐波的分布成为准确分析谐波的关键所在,最后通过易语言实现了电磁分析的可视化编程,并在系列风力发电机的实际工程中,用此程序优化计算,最终确定了系列风力发电机的恰当定转子槽配合为72／82。