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Abstract: The authors analyze the current status of hybrid rice breeding for superior high-yielding.The breeding strategies for superior high-yielding in hybrid rice by core approaches as the utilization of wide compatibel restorer lines and male sterile
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文摘:分析了我国杂交稻超高产育种的现状，着重讨论了以创制广亲和恢复系和广亲和不育系以及理想株型塑造等为核心的杂交稻产量超高产育种策略，并提出了今后应加强的研究内容。 |
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Abstract: The authors studied a lot of related data and analyzed three development stages of the softwares, and it is held that the softwares have the development tendency as follows:(1)the establishment of model will be based on the space distribution re
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文摘:为了准确和定量地重建出盆地发展过程或油气成藏过程，掌握盆地与油气成藏模拟软件发展趋势及技术难点，通过研究相关资料，对盆地与油气成藏模拟软件的三个发展阶段进行了分析.总结出盆地与油气成藏模拟软件的发展趋势：源岩与油气藏在空间上的关系决定着油气藏形成过程，应以源岩与油气藏的空间组合关系为基础建立模型，将盆地模拟技术与资源评价思想结合模拟出油气藏形成过程；发展模拟的真三维技术，实现油气运移的三维动态模拟. |
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Abstract: The authors that the Variable Frequency Speed is applicable and economic only in some range to the irrigation and drainage pumping station at the present time.
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文摘:文中通过对灌排泵站采用变频调速的适用性及经济性进行分析研究，提出目前灌排泵站采用变频调速并非具有广泛适用性，该调节方式仅在一定适用范围内具有经济合理性。 |
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Abstract: The automation of coal flotation has been wandering for many years in China.The production efficiency is relatively low because of the feed forward control which adds the flotation reagent based on the fine coal in feed slurry,ignoring the quant
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文摘:浮选自动化在我国多年来徘徊不前，一直采用根据入浮煤浆中的干煤泥量来确定加药量的前馈控制方法，而不直接以产品的数质量指标作为控制目标，导致浮选生产效率较低.针对上述问题，研究了浮选工艺参数的检测方法，开发了浮选浆位仪和煤浆测灰仪，设计了浮选计算机控制系统，它根据煤浆测灰仪旁线检测的精煤灰分，运用模糊控制技术，通过调整浮选药剂添加量和浮选机浆位，来实现浮选过程的反馈控制.工业性试验表明，煤浆测灰仪的性能指标接近国外先进水平.煤泥浮选测控系统在淮北选煤厂的现场使用，使浮选生产在精煤灰分合格的前提下，得到了 |
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Abstract: The average diffusion coefficient of carbon in surface layer of steel 20 rare ea rth carburized at 880 and 900 ℃ for 8 h was calculated by substituting the mea sured layer depths into the diffusion equation.
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文摘:通过对20钢常规气体渗碳和稀土渗碳层深的测定，计算出稀土渗碳时碳在奥氏体中的平均扩散系数。 |
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Abstract: The bacterial stem blight is one of the important diseases on broad bean.
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文摘:蚕豆细菌性茎疫病是蚕豆上的重要病害之一。 |
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Abstract: The base principle,key technology,characteristic and progress on synthesis of ceramic powders by solid-state metathesis reactions are described.
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文摘:本文扼要地介绍了固态复分解反应法制备陶瓷粉末的基本原理、关键技术、特点及其研究进展。 |
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Abstract: The basic conception and control methods were briefed in modern system engineering, and the thinking of Large Scale Systems applied in modern greenhouse system modeling was advanced.
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文摘:在简介现代系统工程发展的基础上，引入了“大系统”的基本概念，综述了“大系统”理论的特征、分类和大系统的控制方法。 |
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Abstract: The basic contruction of a far infra-red broiling reel was introduced,and the movement of materials inside the reel and design of the machine were analysized.
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文摘:介绍了远红外转筒炒籽机的基本结构，并结合物料运动，分析了几个主要设计问题。 |
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Abstract: The basic theory and function of CD retrieval and systemic constitution of multimedia searching databases CD co-developed by the author and Tsinghua University is stated.The system consists of load,databases,HTML browser,editing and print.The sy
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文摘:介绍了作者与清华大学合作开发的多媒体全文检索数据库光盘的系统组成与光盘的检索功能及原理.系统由标引系统、资料建库系统、超文本浏览器、编辑出版系统组成.该系统几乎支持所有的多媒体格式，具有强大的检索功能，不仅囊括了手工检索的全部方法，还可进行模糊逻辑检索和任意混合检索.其检索过程实际是一个数据匹配的过程.实践证明，光盘数据库使检索大众化、简单化和普及化，在信息储存方面前景广阔. |
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Abstract: The boundary-value problem of an ultra-hyperbolic equation with an integral condition is studied and existence and uniqueness of the solution are proved.
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文摘:本文研究一类超双曲型方程的极限问题，提出并证明了具一积分条件的超双曲型方程的边值问题解的存在性和唯一性。 |
