The species of the old products market is relatively rare,by contrast,the small close products covering a wide range of products,their market has enormous potential. There are household items,kitchen supplies,travel g...The species of the old products market is relatively rare,by contrast,the small close products covering a wide range of products,their market has enormous potential. There are household items,kitchen supplies,travel goods,as well as entertainment and so on. These areas can be created for the old to use a small product. Creative design doesn't necessarily only for the youth.展开更多
An increase in methane,spontaneous fire and bumping hazards in Polish hard coal mines,observed in the last two decades,led to the need to elaborate the tools allowing proper selection of a range of preventive measures...An increase in methane,spontaneous fire and bumping hazards in Polish hard coal mines,observed in the last two decades,led to the need to elaborate the tools allowing proper selection of a range of preventive measures to fight them at the stage of designing coal extraction.Designing the production of a coal seams in the conditions of associated methane and spontaneous fires hazards in Polish hard coal mines requires elaboration of the design standards for coal panels in gassy coal seams.This paper presents the guidelines on how to design production in the conditions of associated methane and spontaneous fire hazards.Presented tools and methodology since the very first research were many times verified by daily mining operations in the conditions of associated methane and spontaneous fire hazards,which confirms their significant contribution to the development of safe and economical mining operations.展开更多
Computer supported collaborative design (CSCD) technology has been applied extensively with intensive market competition.The key technologies and problems of CSCD are analyzed and a CSCD design frame faced to product ...Computer supported collaborative design (CSCD) technology has been applied extensively with intensive market competition.The key technologies and problems of CSCD are analyzed and a CSCD design frame faced to product design is estab- lished.Then a CSCD system faced to radar key components is founded with Pro/INTRALINK software and re-exploiting technolo- gy.Some key processes are also designed,such as database management,work flow programming,information communication, file release,conflict identification and safety management.These will provide a reference for constructing a cooperative design en- vironment.展开更多
A six-element Yagi-Uda array is optimally designed using Central Force Optimization (CFO) with a small amount of pseudo randomly injected negative gravity. CFO is a simple, deterministic metaheuristic analogizing grav...A six-element Yagi-Uda array is optimally designed using Central Force Optimization (CFO) with a small amount of pseudo randomly injected negative gravity. CFO is a simple, deterministic metaheuristic analogizing gravitational kinematics (motion of masses under the influence of gravity). It has been very effective in addressing a wide range of antenna and other problems and normally employs only positive gravity. With positive gravity the six element CFO-designed Yagi array described here exhibits excellent performance with respect to the objectives of impedance bandwidth and forward gain. This paper addresses the question of what happens when a small amount of negative gravity is injected into the CFO algorithm. Does doing so have any effect, beneficial, negative or neutral? In this particular case negative gravity improves CFO’s exploration and creates a region of optimality containing many designs that perform about as well as or better than the array discovered with only positive gravity. Without some negative gravity these array configurations are overlooked. This Yagi-Uda array design example suggests that antennas optimized or designed using deterministic CFO may well benefit by including a small amount of negative gravity, and that the negative gravity approach merits further study.展开更多
Google Earth虚拟地球软件,因其能提供高精度的三维地图和匹配真实地表信息的高清画面而被广泛地应用于各个领域,已在城市轨道交通工程控制网布设、地震应急、水利水电测绘和道路设计等方面得到应用。结合贵州省松桃县后寨村土地开发项...Google Earth虚拟地球软件,因其能提供高精度的三维地图和匹配真实地表信息的高清画面而被广泛地应用于各个领域,已在城市轨道交通工程控制网布设、地震应急、水利水电测绘和道路设计等方面得到应用。结合贵州省松桃县后寨村土地开发项目,阐述了Google Earth在项目区选址、现状图绘制、工程设计和三维场景仿真中的应用。展开更多
文摘The species of the old products market is relatively rare,by contrast,the small close products covering a wide range of products,their market has enormous potential. There are household items,kitchen supplies,travel goods,as well as entertainment and so on. These areas can be created for the old to use a small product. Creative design doesn't necessarily only for the youth.
文摘An increase in methane,spontaneous fire and bumping hazards in Polish hard coal mines,observed in the last two decades,led to the need to elaborate the tools allowing proper selection of a range of preventive measures to fight them at the stage of designing coal extraction.Designing the production of a coal seams in the conditions of associated methane and spontaneous fires hazards in Polish hard coal mines requires elaboration of the design standards for coal panels in gassy coal seams.This paper presents the guidelines on how to design production in the conditions of associated methane and spontaneous fire hazards.Presented tools and methodology since the very first research were many times verified by daily mining operations in the conditions of associated methane and spontaneous fire hazards,which confirms their significant contribution to the development of safe and economical mining operations.
基金Funded by Tackling Item of Minister of Science and Technology(2001BA201A56)
文摘Computer supported collaborative design (CSCD) technology has been applied extensively with intensive market competition.The key technologies and problems of CSCD are analyzed and a CSCD design frame faced to product design is estab- lished.Then a CSCD system faced to radar key components is founded with Pro/INTRALINK software and re-exploiting technolo- gy.Some key processes are also designed,such as database management,work flow programming,information communication, file release,conflict identification and safety management.These will provide a reference for constructing a cooperative design en- vironment.
文摘A six-element Yagi-Uda array is optimally designed using Central Force Optimization (CFO) with a small amount of pseudo randomly injected negative gravity. CFO is a simple, deterministic metaheuristic analogizing gravitational kinematics (motion of masses under the influence of gravity). It has been very effective in addressing a wide range of antenna and other problems and normally employs only positive gravity. With positive gravity the six element CFO-designed Yagi array described here exhibits excellent performance with respect to the objectives of impedance bandwidth and forward gain. This paper addresses the question of what happens when a small amount of negative gravity is injected into the CFO algorithm. Does doing so have any effect, beneficial, negative or neutral? In this particular case negative gravity improves CFO’s exploration and creates a region of optimality containing many designs that perform about as well as or better than the array discovered with only positive gravity. Without some negative gravity these array configurations are overlooked. This Yagi-Uda array design example suggests that antennas optimized or designed using deterministic CFO may well benefit by including a small amount of negative gravity, and that the negative gravity approach merits further study.
文摘利用蒺藜苜蓿(Medicagotruncatula)EST数据库开发新的EST-SSRs标记,分析EST-SSRs的分布特征。利用SSRIT软件对NCBI上公布的285 285条蒺藜苜蓿EST序列进行SSR序列的检测,共检测出6 688个SSR序列,分布于6 512个EST中,占整个EST数据库的2.28%。其中二核苷酸重复基元出现的频率最高,占总EST-SSRs的34.4%(2 301条),其次是三核苷酸重复基元,占29.6%(1 982条),4～6核苷酸重复基元所占比例均较小。利用Pri mer Premier 5.0随机设计100对EST-SSRs引物,PCR扩增结果表明,85对引物在蒺藜苜蓿RIL群体亲本A17和A20上有清晰的扩增条带,占合成引物总数的85%,在RIL-8群体中检测到29个EST-SSRs引物有多态性,占可扩增引物的34.1%。本研究开发了85个蒺藜苜蓿EST-SSRs新标记。
