水下LED集鱼灯灯载视频系统设计     

卢克祥  许家龙  王伟杰  钱卫国  叶超 《渔业现代化》2016,(6):51-54

为实时获取光诱捕捞作业时水下鱼群状态的视频信息,设计了一款水下LED集鱼灯灯载视频系统。该系统在结构设计上以水下LED集鱼灯为载体,在其内部嵌入了一套数字视频解决方案;在信号处理上利用正交频分复用技术(OFDM)对数字视频信号进行调制,以克服电力线上的杂波和电流信号固定脉冲对视频信号的干扰;在通信设计上以电力载波(PLC)方式作为视频信号传输方案。该系统设计完成后,对其信号传输性能进行了测试。结果表明,在电力线标称截面积6 mm2、长度30 m时,系统延时3 ms,丢包率0%,实际传输速率为8 000 Kbps。系统在不改变集鱼灯结构的前提下,添加了视频拍摄功能,且无需单独增设视频传输线,可作为光诱渔船上的辅助渔捞设备使用,也可拓展应用于鱼类行为实验中。  相似文献   

Trapping Cryptophlebia illepida and C. ombrodelta (Lepidoptera: Tortricidae) in macadamia in Hawaii     

Vincent C. S. Chang 《国际虫害防治杂志》2013,59(2):104-108

Abstract

Two species of Cryptophlebia found in Hawaii's macadamia orchards are active in different parts of a tree canopy. C. illepida (Butler) males were mostly caught in traps hung 1·5 m to 9.1 m from the ground; whereas C. ombrodelta (Lower) males were caught from 9.1 m to 15.2 m. A plastic, cylindrical sticky trap caught equal numbers of C. illepida males as Pherocon 1C traps but more than delta traps. A synthetic pheromone blend of 93% (Z)‐8‐dodecenyl acetate, 4% (E)‐8‐dodecenyl acetate, 1% (Z)‐8‐dodecenol, and 2% (2)‐7‐dedecenyl acetate attracted more males than other blends. No significant differences were detected between the two Cryptophlebia species in their response to the four‐component pheromone blend when traps were hung 4.6 m from the ground.  相似文献   

Locust Plagues and the Dieldrin Controversy     

D. L. Gunn CBE 《国际虫害防治杂志》2013,59(2):148-154

Abstract

The accepted strategy for the control of locust plagues is to check an upsurge of population before swarms break out and start a widespread plague. The organisation, men and materials necessary for this work must be established before locust plagues are imminent. Primary targets for control are the hoppers. Red locust hoppers can be efficiently controlled only by vegetation baiting with dieldrin. The ULV drift-spraying method of application is particularly successful. Objections to the use of dieldrin on environmental grounds have been put forward but are without substance when the recommended method is used. A small aircraft can blanket spray 5,000 ha/h using the ultra low dosages necessary for desert locust hoppers. Three such aircraft could cope with the area of red locust hopper outbreaks although the dosage necessary for these is likely to be higher in the denser vegetation of their habitat. Field trials to establish the lowest dosage rate for red locust hoppers are urgently required.

If the facilities and resources needed to control locust plagues are not made available, it is hoped that FAO will provide expert teams to survey the economic and social effects of a locust plague, by investigation on the spot, so that responsibility can be assigned and an accurate history can be drawn up for the guidance of future governments. At the present time, governments have the choice of providing what is needed in the confident expectation of preventing plagues, or providing too little or nothing which will, sooner or later, inevitably lay a plague on their doorsteps.  相似文献   

花椒伪安瘿蚊对不同黄色的选择性和粘卡技术应用研究     

黄燕丽 《植物保护》2013,39(4):156-158

研究报道了6种不同波长的黄色粘卡对花椒伪安瘿蚊的诱捕能力及诱捕方法,并在花椒伪安瘿蚊种群动态监测方面与套笼法进行了比较.结果表明,波长为590.0 nm的黄色粘卡诱杀效果最好;在诱捕数量上,以横置粘卡在0.5m高度捕获的花椒伪安瘿蚊最多;在成虫种群动态监测方面,粘卡技术比套笼方法更准确、灵敏和方便.  相似文献   

Essential oils and their compositions as spatial repellents for pestiferous social wasps     

Qing‐He Zhang  Rodney G Schneidmiller  Doreen R Hoover 《Pest management science》2013,69(4):542-552

  相似文献   

水稻二化螟性诱测报与防治技术研究   总被引：1，自引：0，他引：1  

邹治  张婉英  瞿洁  徐浩良 《上海农业学报》2013,29(4)

为了研究二化螟诱剂的诱蛾能力与测报效果,进行二化螟性诱剂与灯光诱捕的测报对比试验.结果表明:二化螟性诱剂具有较强的诱蛾能力,其诱娥量高于灯光诱捕的诱蛾量,且受环境影响较小,诱测结果能够反映出二化螟当年发生的实际情况;二化螟性诱剂防治示范试验表明,性诱剂对二化螟有较好防治效果,可作为绿色防控的有效手段之一.  相似文献   

花卉生产中花期调节补光灯配光方案设计研究     

王峰  李抒智  马可军  庄美琳 《农业科学与技术》2013,(11):1629-1631

[目的]介绍各种光源特性,筛选最佳大棚花卉生产补光灯配光方案。[方法]选用菊花切花生产为试材,采用白光复合光照,在大棚里配置高压钠灯、荧光节能灯、LED农业专用灯,根据3种灯具的光形特点和植物生长需求,进行实地测试,比较各种灯具的实际应用效果。[结果]结果表明,LED新型光源在整灯实际应用中节能效果明显优于其他两种灯具;LED方形灯具设计呈蝙蝠翼光形配光曲线最有利于温室实施有效布灯。[结论] LED农业专用补光灯优于目前最常用的钠灯,具有节能易布灯等特点,具有实际推广应用价值。  相似文献   

实蝇营养诱剂对苦瓜实蝇类害虫的诱杀效果     

范振仪  蔡俊  杨红霞  董小林 《广东农业科学》2013,40(12):93-95

实蝇可危害多种水果和葫芦科蔬菜,造成重要经济损失,生产实践中诱杀是防治实蝇最安全、有效、常用的方法.实蝇营养诱剂实蝇克(含0.05％阿维菌素)对危害苦瓜的实蝇类害虫的诱杀防治试验结果表明,实蝇克以1～20倍清水拌匀置于敞口诱食器,能有效诱集桔小实蝇、瓜实蝇等常见实蝇,其中以桔小实蝇的诱集量最大、约占70％,其次是瓜实蝇、占15％～25％,其他实蝇占5％～15％,对桔小实蝇雌虫的诱集并无明显的性别选择倾向.在实蝇高峰期,实蝇克以1～20倍清水拌匀诱捕实蝇,每隔7d换药1次,连续换药3次,苦瓜果实带虫率可控制在5％以内,保护作用可达80％以上,效果优于或相当于商品化生产使用的物理粘杀剂.  相似文献   

Improved GC‐MS/MS Method for Determination of Atrazine and Its Chlorinated Metabolites in Forage Plants—Laboratory and Field Experiments     

《Communications in Soil Science and Plant Analysis》2012,43(13-14):1753-1773

Abstract

Analytical procedures using gas chromatography–ion trap tandem mass spectrometry (GC‐MS/MS) were developed to analyze atrazine (ATR) and its dealkylated metabolites in four forage species (switchgrass, tall fescue, smooth bromegrass, and orchardgrass). Atrazine, deethylatrazine (DEA), and deisopropylatrazine (DIA) were extracted with methanol (CH₃OH) followed by liquid–liquid extraction and partitioning into chloroform, with additional cleanup by C₁₈ solid‐phase extraction (SPE). Through the optimization of ionization conditions and ion storage voltages, the background noise of product ion spectra (MS/MS) was reduced dramatically, providing sub‐µg/kg detection limits. Mean recoveries of ATR, DEA, and DIA were 94.3, 105.6, and 113.1%, respectively. The estimated limit of detection (LOD) was 0.6 µg/kg for ATR, 1.3 µg/kg for DEA, and 0.3 µg/kg for DIA. These LODs were one to two orders of magnitude lower than those reported for other GC‐MS, GC‐MS/MS, high pressure liquid chromatography (HPLC)‐UV, or HPLC‐MS/MS procedures designed for food‐safety monitoring purposes. To validate the developed method, a field experiment was carried out utilizing three replications of four forage treatments (orchardgrass, tall fescue, smooth bromegrass, and switchgrass). Forage plants were sampled for analyses 25 days after atrazine application. DEA concentrations in C3 grasses ranged from 47 to 96 µg/kg, about 10‐fold higher than in switchgrass, a C4 species. The ATR and DIA concentrations were similar, ranging from 1.5 to 13.2 µg/kg. The developed method provided sufficient sensitivity to determine the fate of ATR and its chlorinated metabolites via plant uptake from soil or dealkylation within living forage grasses. It also represented significant improvements in sensitivity compared to previous GC methods.  相似文献   

复合涂膜结合紫外处理对鲜切木瓜冷藏品质的影响   总被引：3，自引：2，他引：1  

王娟  陈平生  孟祥春 《农业工程学报》2012,28(2):273-278

为了延长鲜切木瓜的保鲜时间,利用尼辛、那他霉素、薄荷油、氯化钙、香兰素、壳聚糖制成复合保鲜涂膜液,考察涂膜及紫外线处理对木瓜鲜切块贮藏品质(包括色泽、可溶性固形物含量、失水率、维生素C含量、可滴定酸、霉菌酵母数、菌落总数)的影响。由均匀设计试验优化涂膜液配方以及紫外线处理参数。研究结果表明:涂膜及紫外线处理可较好地保持鲜切木瓜的色泽,抑制褐变,保持较高的可溶性固形物含量,减少贮藏过程中的水分损失,抑制霉菌、酵母菌和细菌的增长。采用SAS软件建立各参数与菌落总数关系的回归方程。利用非线性规划法得到较佳的复合涂膜配方与紫外线处理参数为:壳聚糖质量分数1.0%,氯化钙质量分数0.6%,Nisin0.10g/kg,那他霉素14.0mg/kg,香兰素质量分数0.3%,薄荷油1.5mL/L,紫外照射时间22min,紫外照射距离范围44～66cm。此复合涂膜配方与紫外线处理可使货架期至少达到6天,为鲜切木瓜保鲜提供技术参考。  相似文献