山西省设施农业的发展现状与对策分析

设施农业是利用人工建造的设施,为种植业、养殖业及其产品的贮藏保险等提供最佳的环境条件,以其将农业生物的遗传潜力变为现实的巨大生产力,获得速生、高产、优质和高效的农畜产品.因其科技含量高而成为当今世界各国大力发展的高新技术产业.设施农业的发展程度成为衡量一个国家或地区农业现代化水平的重要标志之一.综述山西省设施农业现状和目前发展中所存在的问题,并对山西省设施农业的发展提出了建议.     

金华市婺城区设施农业现状与发展

指出设施农业是现代化农业的重要内容,阐述了浙江省金华市婺城区近几年来设施农业的发展现状,认真分析了婺城区设施农业发展的特点和存在的问题.提出了今后发展设施农业的对策和建议.     

浅议加快我国设施农业装备发展的建议

我国是农业人口大国，农业生产的发展关系到国民经济的发展。随着机械技术的发展，农业装备机械化水平不断得以提高。然而，我国设施农业装备发展仍然存在不少的问题，设施农业装备发展制约因素较多，如何提高我国设施农业装备的质量和水平，推进我国农业生产机械化，是我国农业发展的重要问题。     

浅析高寒地区发展设施农业的策略

设施农业是现代农业的显著标志.发展设施农业,可有效提高土地产出率、资源利用率和劳动生产率,增强农业抗风险能力、市场竞争能力和可持续发展能力,对于保障农产品有效供给,促进农业发展、农民增收,增强农业综合生产能力具有十分重要的意义.针对当前甘南州设施农业发展的基本情况、主要做法及经验,以及存在的一些问题,提出了今后设施农业发展的目标、主要措施和政策建议.     

朔州市设施农业发展现状及对策

一、朔州市设施农业发展现状 截至2011年底,朔州市共有日光温室和塑料大棚等设施面积0.4万hm2.两年来新增设施农业面积相当于过去20年发展设施农业总和的2倍,产量50多万t,产值20多亿元,每0.067 hm2纯收入2万～3万元,花卉、食用菌达到了10万多元,高的达到了20多万元.设施结构为日光温室、移动大棚、中小拱棚并举,并且由单棚向多棚、近郊向远郊、平川向山地丘陵、水地向旱地、小型向大型发展;种植品种已由过去的单一种菜拓展为蔬菜、水果、食用菌、花卉、山野菜、西甜瓜、特种苗木等所有适宜设施栽培的作物;栽培模式既有提早、延晚栽培,又有反季、越夏栽培,实现了四季生产,周年供应.设施农业已成为朔州市抗灾减灾、农业增效、农民增收的重要途径,特别是为农村妇女劳动力提供了就地、就近创业增收的机会,全市有6万多劳动力在设施农业上就业,设施农业已成为朔州市现代农业的重要标志之一.预计在"十二五"期间,朔州市将每年新增设施农业0.27万hm2,户均0.067 hm2温室,设施农业为农民提供的纯收入要达到4000元.     

设施农业植物保护常用技术

设施农业是综合应用工程装备技术、生物技术和环境技术,按照动植物生长发育所要求的最佳环境,进行动植物生产的现代农业生产方式.设施农业的快速发展,为有效保障我国蔬菜、肉蛋奶等农产品季节性均衡供应,改善城乡居民生活发挥了十分重要的作用.目前,我国设施栽培面积250余万公顷,每年人均消费蔬菜量的30%由设施农业提供.加强设施农业病虫害的防治,是保证我国农产品正常供应的必要措施,也是发展设施农业不可忽视的问题.     

刍议大同市设施农业生产的现状与对策

设施农业是一种高效农业,也是农产品打破传统农业的季节性,实现农产品的反季节上市,进一步满足多元化、多层次需求的有效方法.大同市设施农业也正在逐步向专业化、区域化、规模化生产发展,但也存在着一些问题,在各级部门的支持下,采取了相应对策,设施农业得到了进一步发展,成为现代农业建设的一个重要组成部分.     

利用设施农业技术带动种植效益的思考

随着我国农业领域的迅速发展,将设施农业技术加以科学运用,这对促进种植效益提升就能起到良好作用。设施农业技术也是现代化农业发展必要的途径方式,只有实现设施农业发展目标,才能带动种植产业的可持续发展。先就我国设施农业发展现状以及设施农业技术发展的必要性简要阐述,并就设施农业技术和带动种植效益的发展措施详细探究,期望借此研究为实际种植效益提升起到一定启示作用。     

界首市设施农业机械化发展情况调研

近几年来,农业产业结构不断调整,为设施农业的发展提供了良好的机遇,设施农业作为改造传统农业,实现产业升级和推动农业现代化的主要手段,已成为农村经济增长的支柱,也是今后农业发展的重点。界首市农机局高度重视设施农业工程建设工作,把发展设施农业作为调整农业结构,发展壮大村域经济、培育农民增收的重要突破点来抓,全市的设施农业发展呈现出良好的增长态势。     

设施农业发展与蔬菜病虫害防治应对策略探析

当下,设施农业已成为一项重要的蔬菜种植模式,不仅有利于促进我国蔬菜质量的提升,同时也满足了人们的日常需求.在设施农业生产中,要不断增强政府的引导作用,加强技术专业研发和专业人才培养,同时通过科学选择良种、合理施肥与用药、抓住病虫害防治有利时机等科学合理的有效措施,防治病虫害,以保证蔬菜产量和质量,进一步促进我国设施农业的可持续发展.主要根据设施农业发展现状,对设施农业发展与蔬菜病虫害的防治策略进行了探析,以此为相关工作人员提供参考.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.