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排序方式: 共有308条查询结果,搜索用时 281 毫秒
1.
湘南地区杂柑天草高接换冠关键技术 总被引:3,自引:0,他引:3
天草杂柑的高接换冠的关键技术主要是:注意选择母树并适当修剪;合理采穗和保湿;科学嫁接;嫁接后精心管理. 相似文献
2.
色谱、光谱及联用技术在多农药残留检测中的应用 总被引:5,自引:4,他引:5
介绍了国内外多农药残留检测的发展状况,综述了色谱法、光谱法、色谱-质谱联用技术、色谱-光谱联用法、多维气相色谱技术的特点及在多农药残留检测中的应用,指出多农药残留检测在今后的农药残留检测中将占据主导地位. 相似文献
3.
YU Guang-ning ZHANG Chun-hui SU Zhong-jie FAN Xue-li PAN Yong-zhan LIU Fu-shun . Civil engineering institute Qingdao Technological University Qingdao . Engineering college Ocean University of China Qingdao . Liaoning Technical University Fuxin 《地球与环境》2005,33(Z1):17-26
<正>To control land surface subsidence caused the underground mineral exploitation and the catastrophic phenomena such as serious damage of buildings, waterbodies, cultivated lands, railways, bridges caused by land subsidence, bed separation grouting technology of overburden is put forward. To provide theoretical support for the technology, the characteristics and the mechanics mechanism of mining overburden from layer-split to formation of bed separation are studied. On the basis of elastic sheet board theory, calculation formula of rock sheet deflection is presented, and the mechanics criteria of the separation formation and the calculation formula of bed separation volume are set up. Finally, the applications and technics of bed separation grout technology of mining overburden to control land subsidence in china are introduced. 相似文献
4.
阐述了在靶场中应用的屏蔽技术、接地技术、滤波技术、静电放电保护措施、机动车辆干扰控制等硬件抗干扰技术以及常用的软件抗干扰技术,这些措施的综合应用可以有效提高靶场设备的电磁兼容性. 相似文献
5.
沉积物间隙水的几种制备方法 总被引:10,自引:0,他引:10
间隙水的制备对研究沉积和中物质的动力学非常重要。间隙水的制备方法有离心法、压榨法、渗析法、吸气引液法等,这些方法各有利弊。本文对这些方法分别进行了了综合比较。 相似文献
6.
For more than 30 years, multiple research groups have worked on the automation of hazard and operability (HAZOP) studies, or more specifically on the hazard identification process. So far, very few of these approaches have been used in the chemical process industry. Automatic hazard identification is a knowledge-intensive process that demands high standards with regard to the way in which knowledge is stored and made available. There are various suitable approaches to the qualitative modeling of processes and plants, which are the foundation for reasoning systems that are used for the identification of hazards. Additionally, there are quantitative methods that are based on process simulations and can be used to identify potential hazards. The investigation of the state of research demonstrates that there are sophisticated technologies for automated systems that include powerful reasoning techniques. The benefits and shortcomings of existing technologies are discussed with regard to their industrial applicability. Often, the quality of the necessary specific and generic knowledge is not sufficient to detect potential hazardous events and operational malfunctions. Computer-aided HAZOP systems should be integrated with computer-aided design- or process simulation software using common data models based on the digital representation of the process plant. In order to be used by HAZOP practitioners automated systems need to be comprehensive, serve as specialized decision support systems, and be tested and evaluated using round robin tests. 相似文献
7.
8.
A soil sampling intercomparison exercise for the ALMERA network 总被引:1,自引:0,他引:1
Maria Belli Paolo de Zorzi Umberto Sansone Abduhlghani Shakhashiro Adelaide Gondin da Fonseca Alexander Trinkl Thomas Benesch 《Journal of environmental radioactivity》2009
Soil sampling and analysis for radionuclides after an accidental or routine release is a key factor for the dose calculation to members of the public, and for the establishment of possible countermeasures. The IAEA organized for selected laboratories of the ALMERA (Analytical Laboratories for the Measurement of Environmental Radioactivity) network a Soil Sampling Intercomparison Exercise (IAEA/SIE/01) with the objective of comparing soil sampling procedures used by different laboratories. The ALMERA network is a world-wide network of analytical laboratories located in IAEA member states capable of providing reliable and timely analysis of environmental samples in the event of an accidental or intentional release of radioactivity. Ten ALMERA laboratories were selected to participate in the sampling exercise. The soil sampling intercomparison exercise took place in November 2005 in an agricultural area qualified as a “reference site”, aimed at assessing the uncertainties associated with soil sampling in agricultural, semi-natural, urban and contaminated environments and suitable for performing sampling intercomparison. In this paper, the laboratories sampling performance were evaluated. 相似文献
9.
罗小锋 《中国人口.资源与环境》2011,21(4)
研究农户技术采用行为,对于解决农业技术转化与扩散问题具有重要意义.本文以6个省1672户农户的问卷调查结果为依据,从农户技术采用率和采用行为模型2个层面,研究农户采用节约耕地型技术与节约劳动型技术是否存在差异及影响农户技术采用行为的因素.农户技术采用率调查表明.有60%以上的农户采用了机耕技术,只有23.5%的农户采用了高产品种.采用行为模型的定量分析表明,具有不同家庭特征、外部环境特征的农户基于技术自身特征差异会表现出不同的技术采用行为.具体表现为,同一变量对农户采用不同属性技术的影响各不相同.本村地形、耕地面积、技术作用认知、出行频率对节约耕地型技术和节约劳动型技术采用都有较为显著的影晌;户主年龄、专业技能、家庭人均收入、参加技术培训、借款难易对一种技术的采用影响显著,对另一种技术的采用则影响不显著. 相似文献
10.
Pyrzynska K 《Chemosphere》2011,83(11):1407-1413
With increasing public concerns for agrochemicals and their potential movement in the ecosystem, very sensitive, selective and precise methods for the analysis of pesticides are needed. Because these substances are present usually at trace levels, the extraction and preconcentration steps are so far essential for their detection. Discoveries of novel nanomaterials with unique properties have significant impact on their use also in extraction techniques. This overview reports the recent application of carbon nanotubes in the analysis of pesticides. The largest numbers of reported applications of carbon nanotubes concern their role as a sorbent materials in solid-phase extraction and microextraction techniques. 相似文献