共查询到20条相似文献，搜索用时 312 毫秒
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集装箱装卸桥电气控制系统仿真 总被引：2，自引：0，他引：2
蔡志刚 《实验室研究与探索》2005,24(11):34-36
介绍集装箱装卸桥电气控制系统设备的仿真。在具体设计时考虑到实用性，设计的电气控制系统中采用了两类不同的驱动系统，即起升与大车共用一套交流变频调速驱动系统，小车与臂架俯仰共用一套直流调压调速驱动系统。为了提高控制系统的先进性，在90-30PLC的控制模块扩展时增加了网络通讯模块，可以实现网络通讯。 相似文献
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“及时反馈，增强动机作用”在学校管理中的运用个旧市第二中学云波先举个例子，某空运公司欲促使机场装卸工人扩大和更有效地使用集装箱，以节约装卸时间，而上人认为自己已经很好地利用了集装箱了。但仔细调查发现，在可以使用集装箱装运的场合，只有４５％利用了集装箱... 相似文献
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傅荧 《四川教育学院学报》2005,21(9):97-100
本文根据层次分析法和多目标决策理论，结合集装箱码头泊位生产系统的特点，研究提出了集装箱码头泊住生产效率的评价指标体系和评价方法，并通过典型集装箱码头公司的实际生产效率指标分析对比，对该指标体系进行了具体说明。 相似文献
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路易 《青少年科技博览(中学版)》2009,(4):F0002-F0002
由于船载集装箱空仓运输成本过高，目前许多国家闲置着大量的集装箱。船运集装箱结构简单，而且容易生锈，用途有限。没想到，有人却将它们变成了漂亮的现代家庭住房。两位设计师皮特·皮林斯（Pieter Peelings）和西尔维亚·默顿斯（Silvia Mertens）突发奇想，经他们一番重新设计，原本当作废品处理的集装箱，转眼便成为适合办公和居住的现代时尚房间。 相似文献
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赵新国 《淮南职业技术学院学报》2005,5(1):51-53
针对集装箱采样没有统一标准，采样结果误差较大的情况；参照国家标准中汽车外运商品煤的三点循环采样法，在一点法的基础上，通过逐次增加采样子样数，作对比试验，选取与准确值最为接近的五点循环法作为集装箱的采样方法；运用五点循环法进行采样精密度实验，并对实验数据进行数理统计分析，统计结果表明，五点循环法能够达到采样精密度核对规定要求；集装箱五点循环法已在全集团公司进行了推广，取得了较大的经济和社会效益。 相似文献
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随着集装箱运输由传统的"货运业"向现代化的"物流业"发展,我国集装箱港口在信息化建设上不断引进先进技术,但国内一直缺少自主知识产权的集装箱码头信息系统产品。结合具体集装箱码头信息系统设计,重点考虑信息系统软件产品化要求,提出了一种新型的集装箱码头信息系统设计模型;分析了集装箱码头信息系统诸多模块特征;研究了产品化软件系统的设计方法,为集装箱码头信息系统的产品化提供理论依据。 相似文献
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本文对天津港集装箱码头的信息化管理进行了简要说明。介绍了天津港集装箱码头的大门信息管理、堆场信息管理和码头前沿信息管理。希望对天津港及其它港口的集装箱码头的发展规划有所参考。 相似文献
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本文对集装箱装箱问题,利用最大穴度优先原则,提出了一种新的拟物拟人算法,使放入集装箱中的长方体尽可能紧凑的排列,从而提高集装箱空间的利用率。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献