Droplet Dynamics and Initial Field Tests for Microencapsulated Pesticide Formulations Applied at Ultra Low Volume Using Rotary Atomisers for Control of Locusts and Grasshoppers

The physical properties and field efficacy of microencapsulated acridicides (ME) were investigated to determine their suitability for application at Ultra Low Volume (ULV) rates in Sahelian conditions. Microcapsules were not damaged during application using Micronair AU7000 rotary atomisers. Drop size was dependent upon microcapsule size, smaller microcapsules tending to form dense aggregates within large droplets. The aggregation effect was counteracted by larger microcapsule sizes and by dilution of the concentrated formulation. There was a tendency for microcapsules to land dry at increasing distances from the point of application and at high temperatures and low humidities. In the field in Mali (W. Africa) diluted ME formulations were found to be suitable for ULV application by Berthoud C8 hand-held sprayers, vehicle-mounted Micronair AU7000 pest control kits and helicopter-mounted Beecomist rotary atomisers. ME formulations of fenitrothion, chlorpyriphos and diazinon all suppressed grasshopper populations in annual grassland and were as effective as fenitrothion applied at the standard ULV rate. The spatially heterogeneous and shifting nature of the grasshopper populations prevented the relative efficacy or persistence of the different products to be quantified and the potential for reduced environmental impact could not be tested.     

林业推广人员激励机制构建探讨

在以推广人员为核心的人本化管理平台上,构建良好的推广人员激励机制,将会对科技转化提供不竭的动力资源。从推广管理体制改革、基本职能定位、经费保障机制、推广体系运行过程等方面探讨了寻求适合我国推广人员的激励手段,以期构建适应我国推广体系运行的新型激励机制。     

薄壁筒形件滚珠旋压成形工装设计及实验研究

介绍了一种灵活实用的滚珠旋压工装设计方法，以LY12铝合金为旋压材料，通过大量的工艺实验，获得了滚珠直径、壁厚减薄率和进给比等工艺参数对薄壁筒形件旋压成形性的影响，为获得理想的旋压件奠定了一定的理论基础。     

浅议高产优质高效的养蚕技术措施

从消毒防病、省力化养蚕、合理的布局与科学饲养、上簇管理以及人工饲料育蚕几个方面,综述了当前实行高产、优质、高效养蚕的技术措施。     

给桑量和吐丝温度对家蚕吐平面丝的影响

为探明家蚕平面丝生产中给桑量对平面丝相对吐出率的关系和吐丝温度对吐平面丝性状表达的影响，对吐平面丝性状较好的蚕品种浙农１×ＺＡＵ２进行了不同给桑量的比较试验，结果表明，在一定给桑量范围内，平面丝相对吐出率随给桑量的减少有提高的倾向；另外，对浙农１等４个蚕品种进行了在高温（２９℃）、常温（２４℃）和低温（２１℃）条件下吐平面丝的比较试验，结果表明，吐丝温度对平面丝吐丝量和吐丝过程中的落下蚕头次数有显著的影响，对平面丝厚薄均匀度的影响不显著     

热分析法在兽药标准物质研究中的应用

介绍了热分析法在兽药标准物质的热失重、结晶水、熔点和纯度等方面研究的应用。热分析法是测定物质理化性质与温度关系的一种技术,在标准物质研究领域正越来越多地发挥着重要的作用。     

1 300℃下MoSi2/SiC复合材料氧化性能研究

对直接浸渗法制备MoSi2/SiC复合材料在1 300℃下的氧化试样的质量变化进行了研究.观察与分析了氧化层的形貌和相组成.结果表明,复合材料在该温度下保温时间较短时其氧化模式为硅、钼同时氧化,复合材料表现为失重,形成的氧化层结构疏松,存在大量气孔;保温时间较长时氧化模式为硅的选择性氧化,材料表面形成致密的SiO2氧化层,复合材料表现为增重.同时复合材料的抗氧化性与材料的孔隙率和SiC颗粒大小有关,孔隙率越高,SiC颗粒越小,抗氧化性越差.研究表明MoSi2/SiC复合材料可用作1 300℃下的抗氧化材料.     

Preparation and characterization of modified collagen/PAN blending fibers

Graft modification of collagen with acrylonitrile in concentrated aqueous solution of sodium thiocyanate (NaSCN) is developed in this paper. This modification can largely change it’s solubility in water and can be applied in fiber production. Grafting modified collagen is characterized by infrared spectrum and wide angle X-ray diffraction. Wet spinning of PAN fibers containing several content of modified collagen is performed. The tests about these fibers show that breaking strength and sonic orientation decrease as the amount of collagen is raised. The addition of collagen can largely improve the moisture regain of PAN fiber. Micro-appearance of fibers observed under scanning electron microscope (SEM) presents circular cross section and longitudinal grooves on surface, the depth of grooves increases with the increasing draw ratio.     

玉米花丝冰淇淋的工艺优化

将玉米花丝适当处理后用于玉米花丝冰淇淋的生产.以产品的感官评分、膨胀率、抗融性为考察指标,通过单因素试验及正交试验确定玉米花丝冰淇淋的最佳配方.结果表明:当玉米花丝粉、单甘酯、CMC-Na的添加量分别为2.0％、0.2％、0.2％,玉米花丝粉粒度为100目时,生产的冰淇淋具有理想的膨胀率及适当的抗融性,产品组织状态均匀、口感柔滑细腻、风味优良.     

高寒区引水渠道抽水融冰水温变化过程模拟

抽水融冰技术能解决中国西北等高寒地区引水式水电站引水渠冰害。该文以新疆红山嘴电站引水渠道为研究对象,对引水渠道抽水融冰水温变化过程进行数值模拟。通过对模拟结果与原型观测结果对比研究,验证数值模型的可靠性。最后分别模拟分析井水流量、渠道流量、井水温度、渠道水温、流量和温度同时变化时,引水渠道水温沿程变化规律。结果表明:1)井水流量和井水温度变化与混合后水温成正比,井水流量越大,水温越高,渠道增温效果越明显;2)渠道流量变化与混合后水温成反比,渠道流量越大,井水的增温效果越不明显;3)渠道水温与混合后水温成正比,渠道水温越低,混合后水温也越低;4)渠道引水温度降低为原来0.25倍,同时井水流量增大至原来4倍,混合后水温比降低渠水温度时高0.14~1.43℃,在实际工程中,增加井水流量是抽水融冰最有效的方法。研究为寒区引水渠道冰害的防治提供科学依据。