共查询到20条相似文献，搜索用时 343 毫秒
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背负式机动弥雾喷粉机是一种高效率、多功能的植保机械,可进行弥雾、喷粉、撒颗粒、喷烟、喷火、超低容量喷雾等作业.这种喷粉机适应农林作物的病虫害防治、除草、卫生防疫、消灭仓储害虫、喷撒颗粒肥料,以及小粒种子的喷撒播种等. 相似文献
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背负式机动弥雾喷粉机是一种高效率、多功能的植保机械,可进行弥雾、喷粉、撤颗粒、喷烟、喷火、超低容量喷雾等作业. 相似文献
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不同施药方法对小麦赤霉病防效研究 总被引：1，自引：0，他引：1
《上海农业科技》2015,(3)
为探索防治小麦赤霉病的最佳施药器械和用水量,提高机防效果和技术水平,选用了手动喷雾器、多功能静电喷雾器和喷雾喷粉机3种喷雾器,每种喷雾器每667m2用水量分别为75L、50L和30L,测定了不同施药方法对小麦赤霉病的防治效果。结果表明,以静电喷雾器和用水量75L/667m2、喷雾喷粉机和用水量50L/667m2和手动喷雾器和用水量50L/667m2处理的防治效果较好,以静电喷雾器和用水量30L/667m2处理的防治效果最差。结合现有防治仍以手动喷雾器为主的现状,建议采用手动喷雾器、用水量50L/667m2防治小麦赤霉病。 相似文献
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采用喷雾喷粉机喷撒森得保粉剂,进行不同用药量防治黄脊竹蝗试验。结果表明:采取15 kg/hm2和21.5kg/hm2方法效果较好,且二者效果接近;考虑到成本因素,以15 kg/hm2为宜。因药剂属生物制剂,不污染环境且见效快;同时使用喷雾喷粉机工效高、成本低、操作简单,可在黄脊竹蝗防治中推广应用。 相似文献
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静电喷药技术应用研究的现状与发展 总被引：15，自引：1，他引：15
概述了国内外静电喷药技术的原理，发展历史，应用研究的现状和进展，并对静电喷雾喷粉技术在林木和大棚植物病虫害防治，植物人工授粉，林业化学除草，烟剂施放和航空农药喷洒等方面的应用前景进行了探讨和展望。 相似文献
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植保机械,即在农作物生长过程中用来防治病虫害的机械,是防治农业病虫草害不可缺少的工具,包括机动喷粉机、喷雾机(器)、弥雾喷粉机、修剪机、中耕除草机等。现将几种常用的新型植保机械介绍如下:1.3Y C型常温烟雾机:由农业部南京农业机械化研究所研制。该机采用引进技术,经国产化设计,有大、中、小和带静电等5个品种系列,具有烟雾扩散均匀、省水和无污染等特点,是温室大棚防治病虫害的重要机具。该机配套动力0.8～2千瓦,防治面积500～5000平方米/台。2.宽辐远射程喷雾机:由南京农机化研究所研制。该机由高速陶瓷柱塞泵、组合喷枪、自动混… 相似文献
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机动喷雾喷粉机具有轻便灵活、易操作、效率高、成本低、性能稳定、用途广泛等优点，广泛应用于小麦、油菜、玉米、棉花等大田作物病虫草害的防治。据不完全统计，目前陕西省农村拥有各类机动喷雾机数量已达4万～5万台。我们以目前使用最多的泰山—18型背负式机动喷雾喷粉机为代表，就用户经常来电来信咨询的机动喷雾机的正确使用作以系统介绍，希望能对使用者有所帮助。 相似文献
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A review of advances for aircraft engine structural materials and processes is presented. Improved materials, such as superalloys, and the processes for making turbine disks and blades have had a major impact on the capability of modern gas turbine engines. New structural materials, notably composites and intermetallic materials, are emerging that will eventually further enhance engine performance, reduce engine weight, and thereby enable new aircraft systems. In the future, successful aerospace manufacturers will combine product design and materials excellence with improved manufacturing methods to increase production efficiency, enhance product quality, and decrease the engine development cycle time. 相似文献
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Materials and processing innovations that have been incorporated into the manufacture of critical components for high-performance aircraft gas turbine engines are described. The materials of interest are the nickel- and cobalt-base superalloys for turbine and burner sections of the engine, and titanium alloys and composites for compressor and fan sections of the engine. Advanced processing methods considered include directional solidification, hot isostatic pressing, superplastic foring, directional recrystallization, and diffusion brazing. Future trends in gas turbine technology are discussed in terms of materials availability, substitution, and further advances in air-cooled hardware. 相似文献
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燃气轮机在运行过程中常常因压气机积垢、涡轮腐蚀及侵蚀等问题导致部件性能衰退,对整机运行状态造成消极影响。基于性能仿真模型,研究了用于天然气管道的LM2500+SAC 型燃气轮机的高压压气机、高压涡轮、动力涡轮等部件在等熵效率衰减和通流能力变化时,其高压压气机喘振裕度、最大允许输出功率及热循环效率的变化情况。仿真结果表明:高压压气机、高压涡轮等熵效率衰减均会导致燃气轮机最大允许输出功率明显下降,且热循环效率随之降低,但部件通流能力的变化对整机性能的影响较小;为双转子航改型燃气轮机配备具有可转导叶的动力涡轮后,通过增加其通流能力和燃料气供应量,能够有效提升处于亚健康状态机组的最大允许输出功率。研究结果可为故障部件定位和燃气轮机运行优化提供参考。 相似文献
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6110Z涡轮增压柴油机工作过程模拟计算 总被引：1，自引：0，他引：1
在六缸涡轮增压柴油机工作过程数学模型的基础上，应用作者提出了半涡轮叶轮计算法建立了６１１０Ｚ柴油机工作过程模拟计算软件，通过必要的参数估算和软件调试，对６１１０Ｚ涡轮增压柴油机工作过程模拟了计算，结果表明，模拟计算值与实测值是吻合的。 相似文献
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Shea EK Weiss BP Cassata WS Shuster DL Tikoo SM Gattacceca J Grove TL Fuller MD 《Science (New York, N.Y.)》2012,335(6067):453-456
Paleomagnetic measurements indicate that a core dynamo probably existed on the Moon 4.2 billion years ago. However, the subsequent history of the lunar core dynamo is unknown. Here we report paleomagnetic, petrologic, and (40)Ar/(39)Ar thermochronometry measurements on the 3.7-billion-year-old mare basalt sample 10020. This sample contains a high-coercivity magnetization acquired in a stable field of at least ~12 microteslas. These data extend the known lifetime of the lunar dynamo by 500 million years. Such a long-lived lunar dynamo probably required a power source other than thermochemical convection from secular cooling of the lunar interior. The inferred strong intensity of the lunar paleofield presents a challenge to current dynamo theory. 相似文献
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Mars' crustal magnetic field was most likely generated by dynamo action in the planet's early history. Unexplained characteristics of the field include its strength, concentration in the southern hemisphere, and lack of correlation with any surface features except for the hemispheric crustal dichotomy. We used numerical dynamo modeling to demonstrate that the mechanisms proposed to explain crustal dichotomy formation can result in a single-hemisphere dynamo. This dynamo produces strong magnetic fields in only the southern hemisphere. This magnetic field morphology can explain why Mars' crustal magnetic field intensities are substantially stronger in the southern hemisphere without relying on any postdynamo mechanisms. 相似文献
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Sunspots, dark magnetic regions occurring at low latitudes on the Sun's surface, are tracers of the magnetic field generated by the dynamo mechanism. Recent solar dynamo models, which use the helioseismically determined solar rotation, indicate that sunspots should form at high latitudes, contrary to observations. We present a dynamo model with the correct latitudinal distribution of sunspots and demonstrate that this requires a meridional flow of material that penetrates deeper than hitherto believed, into the stable layers below the convection zone. Such a deep material flow may have important implications for turbulent convection and elemental abundance in the Sun and similar stars. 相似文献
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复杂技术创新是发展中国家进行产业结构升级的一个重要努力方向，也是我国实施自主创新战略的重要方面。高度不确定性是复杂技术创新的主要特征，如何从创新模式及组织形式等方面减少创新过程的不确定性，成为复杂技术创新管理的关键所在。复杂技术创新过程中需要多种知识和技能并且需要创造新知识，创新主体对知识资源的获取成为复杂技术创新不确定性的主要来源。自组织网络能够有效降低这种不确定性，从而促进复杂技术创新。 相似文献
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Heyner D Wicht J Gómez-Pérez N Schmitt D Auster HU Glassmeier KH 《Science (New York, N.Y.)》2011,334(6063):1690-1693
The observed weakness of Mercury's magnetic field poses a long-standing puzzle to dynamo theory. Using numerical dynamo simulations, we show that it could be explained by a negative feedback between the magnetospheric and the internal magnetic fields. Without feedback, a small internal field was amplified by the dynamo process up to Earth-like values. With feedback, the field strength saturated at a much lower level, compatible with the observations at Mercury. The classical saturation mechanism via the Lorentz force was replaced by the external field impact. The resulting surface field was dominated by uneven harmonic components. This will allow the feedback model to be distinguished from other models once a more accurate field model is constructed from MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) and BepiColombo data. 相似文献
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以制皂废水经脱硫除尘塔后的出水为研究对象,通过气浮和混凝沉降的中试对比,提出混凝沉应用于出塔水的处理的工艺条件及组合混凝剂的最佳投加量。实验表明,混凝沉降能有效降低制皂废水的COD浓度,处理水可回用于脱硫除尘;同时,混凝沉降后出水可生化性较好,通过生化处理,可实现达标排放。 相似文献