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那一天,我不得已上路,为不安分的心,为自尊的生存,为自我的证明,路上的辛酸已融进我的眼睛,心灵的困境已化作我的坚定。在路上,用我心灵的呼声;在路上,只为伴着我的人;在路上,是我生命的远行;在路上,只为温暖我的人,温暖我的人。在路上,用我心灵的呼声;在路上,只为伴着我的人;在路上,是我生命的远行;在路上,只为温暖我的人,温暖,我的人。 相似文献
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毒死蜱在豆角、辣椒和土壤中的残留动态 总被引:7,自引:0,他引:7
采用GC测定方法,对毒死蜱在广州和海口两地的豆角、辣椒及土壤中的残留动态进行了评价。两年的试验结果表明,毒死蜱在广州豆角中的半衰期为4.30d,在豆角土壤中的半衰期为6.02d,在辣椒中的半衰期为3.99d,在辣椒土壤中的半衰期为7.2ld;毒死蜱在海口豆角中的半衰期为4.45d,在豆角土壤中的半衰期为6.34d,在辣椒中的半衰期为4.78d,在辣椒土壤中的半衰期为8.2ld。毒死蜱在正常使用剂量下,有效成分在两地豆角、辣椒和土壤中的最终残留量均低于0.5mg/kg。 相似文献
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根据文中提出的颗粒局部及整体返混比,对组合式提升管入口区颗粒的返混特性进行了研究,结果表明,在S型颗粒浓度轴向分布时,颗粒在床层底部的返混较小,在顶部的返混较大;而在指数形颗粒浓度轴向分布时,颗粒则在床层底部的返混较大,在顶部的返混较小.在不同操作条件下,床内颗粒具有不同的局部返混特性,在气速较高时,颗粒在床层中心的返混较少,在床层边壁的返混较多;在气速较低时,在床层顶部,颗粒在床层中心的返混较少,在床层边壁的返混较多,而在床层底部,颗粒则在床层中心和边壁处的返混较多,在床层中部的返混较少. 相似文献
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工艺设计是采用先进的工艺设计方案、科学合理、经济可行地实现产品的设计意图。而工艺设计的控制是确保工艺设计可以达到规定目标的适宜性,充分性和有效性的的重要保障,从而使工艺设计能够完全、正确、统一、协调。本文结合复合材料气瓶阐述了复合材料产品设计和开发中的工艺设计程序及控制内容。 相似文献
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Surface and interfacial behavior of protein molecules are crucial for the protein function involved in many biochemical processes and biomedical products such as enzyme design, bio-separation, drug design and delivery. This article is devoted to an overview of design and regulation of the surface and interfacial behavior of protein molecules. The improvement of enzyme surface such as the directed evolution and the rational design of enzymes is introduced at first, followed by the rational design of protein interface for the protein assembly. Thereafter, the design of micro-environment and ligands are described as two examples for the design guided by protein surface. Then the design of protein surface and interface with the help of artificial intelligence will be discussed. 相似文献
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Surface and interfacial behavior of protein molecules are crucial for the protein function involved in many biochemical processes and biomedical products such as enzyme design, bio-separation, drug design and delivery. This article is devoted to an overview of design and regulation of the surface and interfacial behavior of protein molecules. The improvement of enzyme surface such as the directed evolution and the rational design of enzymes is introduced at first, followed by the rational design of protein interface for the protein assembly. Thereafter, the design of micro-environment and ligands are described as two examples for the design guided by protein surface. Then the design of protein surface and interface with the help of artificial intelligence will be discussed. 相似文献
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In this paper, the significant development, current challenges and future opportunities in the field of chemical product design using computer-aided molecular design (CAMD) tools are highlighted. With the gaining of focus on the design of novel and improved chemical products, the traditional heuristic based approaches may not be effective in designing optimal products. This leads to the vast development and application of CAMD tools, which are methods that combine property prediction models with computer-assisted search in the design of various chemical products. The introduction and development of different classes of property prediction methods in the overall product design process is discussed. The exploration and application of CAMD tools in numerous single component product designs, mixture design, and later in the integrated process-product design are reviewed in this paper. Difficulties and possible future extension of CAMD are then discussed in detail. The highlighted challenges and opportunities are mainly about the needs for exploration and development of property models, suitable design scale and computational effort as well as sustainable chemical product design framework. In order to produce a chemical product in a sustainable way, the role of each level in a chemical product design enterprise hierarchy is discussed. In addition to process parameters and product quality, environment, health and safety performance are required to be considered in shaping a sustainable chemical product design framework. On top of these, recent developments and opportunities in the design of ionic liquids using molecular design techniques have been discussed. 相似文献
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搅拌设备设计的发展与建议 总被引:1,自引:0,他引:1
搅拌过程是过程工业常用的单元操作。综述了搅拌设备设计的发展,目前搅拌设备的设计方法可分成依据经典设计手册的设计、专家经验与实验结合的研发性设计、基于CFD的搅拌设备辅助设计三类,并分别进行了分析和论述,强调搅拌设备的优化设计应注重过程工艺特性和设备特性的有效耦合,指出基于计算机网络平台的智能化设计方法是搅拌设备设计的发展方向。 相似文献
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蒸汽动力系统优化设计不仅要保证系统全周期总费用最小,还要保证系统具有一定可操作性应对各种不确定变工况影响。本文提出了同时考虑汽电需求确定性多周期变化以及燃料、电力价格,汽电需求不确定性变化的蒸汽动力系统优化设计策略,专门提出不确定变化参数对优化目标及约束的影响以及数学表达,建立混合整数线性规划(MILP)优化模型进行求解,并应用于某石化企业蒸汽动力系统优化设计。实例设计结果表明,与按照传统策略设计结果相比,应用本文提出的考虑不确定参数的设计策略获得的优化方案,具体设计了针对不确定因素实现而对应的运行调度安排,降低年总费用,保证系统安全稳定运行,实现经济性和可操作性综合最优。 相似文献
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EN 13445、ASME规范和GB150 总被引:1,自引:0,他引:1
对EN 13445、ASME规范、GB 150等的有关内容,如适用范围、材料的防脆断措施、外压壳体设计、凸形封头设计、开孔及其补强设计、法兰设计、换热器设计、按公式设计和按应力分析设计、强度试验压力及其限制条件等的联系和对比作出分析,并提出看法供讨论。 相似文献
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对大型活塞式压缩机基础设计目前多采用专业设计软件,对设计计算的注意事项进行了重点论述,而对构造要求则结合相关资料及设计经验进行了详细论述,力求设计成品更加准确,可靠。 相似文献