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Bülent 《浙江大学学报(A卷英文版)》2010,11(2):106-114
In this study, an electro-mechanical valve （EMV） system for the intake valve ofa fottr stroke, single cylinder, overhead valve and spark ignition （SI） engine was designed and constructed. An engine with the EMV system and a standard engine were tested to observe the effects of the EMV on engine performance and emissions at different speeds under full load. The EMV engine showed improved engine power, engine torque and break specific fuel consumption （BSFC）. A 66% decrease in CO emissions was also obtained with the EMV system, but hydrocarbons （HC） and NOx emissions increased by 12% and 13% respectively. 相似文献
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基于CPLD/FPGA的半整数分频器的设计 总被引：1，自引：0，他引：1
夏继军 《黄冈职业技术学院学报》2005,7(4):81-83
本文以分频比为2.5的半整数分频器的设计为例,介绍了在MAX+plus II开发软件下,利用VHDL硬件描述语言以及原理图的输入方式来实现半整数分频器的过程和方法。 相似文献
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张雷 《鞍山师范学院学报》2003,5(2):21-22
bear半单纯环(半质环)的交换性问题是结合环的交换性理论的一个主要内容．本对满足二元恒等式的半质环进行了讨论，在假定其中一个变量固定的情况下，给出了环中的元属于中心的几个条件，推广了献中的结果． 相似文献
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INTRODUCTIONRoadvehiclesuspensiondesignhasreceivedgreatattentioninrecentyears .Theperformanceofthesuspensionsystemplaysanimportantroleinachievinggoodhandlingandridingcomfort.Practically ,thesimplestandmostcommontypesofsuspensionsarepassiveinthesensethatno… 相似文献
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Semi on-line scheduling for maximizing the minimum machine completion time on three uniform machines 总被引：1，自引：0，他引：1
INTRODUCTION Sequencing and scheduling are forms of deci-sion-making which play a crucial role in most manufacturing and production systems as well as in most information-processing environments, and also exist in transportation and distribution settings and in other types of service industries. A scheduling problem is called on-line if it re-quires scheduling jobs irrevocably on the machines as soon as they are given, without any knowledge about jobs that follow later on. If we have full… 相似文献
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靳小明 《内蒙古师范大学学报(教育科学版)》1998,(2)
本文在文献[1]和[2]的基础上进一步研究了不定映射与半粘合映射,给出了关于它们的几个图形交换定理,所得到的结果完善了文献[1]和[2]的研究。 相似文献
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半结构化数据的特点有 :隐含的模式信息 ;不规则的结构 ;模式信息量大 ;模式变化快 ;先有数据 ,后有模式 ;模式是用于描述数据的结构信息 ,而不是对数据结构进行强制性约束 ;没有严格的类型约束 ;结构不完全。参考文献 13。 相似文献
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