检索结果-南通市图书馆

THE EQUIVALENCE CLASSES OF LRS OVER Z_p^e

在线全文

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 1998年第2期11卷 175-180页

作者： ZHU Yuefei(Department of APPlied Mathematics, zhengzhou InformationEngineering institute, zhengzhou 450002, China) 解放军信息工程学院应用数学系河南郑州 450002

In this paper, we discuss the counting of translation equivalellce classes oflinear recurrence sequences over Zap. For more general linear recurrence relation, we countthe number of translation equivalent classes of l... 详细信息

关键词： Sequence translation equivalence module ideal.

在线全文

学校读者我要写书评

暂无评论

动车段高级修主要工艺及总平面布置研究

铁道标准设计 2024年第4期68卷 220-226页

作者：张正舟欧阳鹏宋东升侯小祥韩永军中国国家铁路集团有限公司工程设计鉴定中心北京100844 中车青岛四方机车车辆股份有限公司青岛266111 中铁第一勘察设计院集团有限公司西安710043 中铁第四勘察设计院集团有限公司武汉430063

动车段是承担动车组高级修的场所,是保证动车组安全、高效运营的重要基础设施,动车组高级修工艺流程复杂,合理的工艺设计是实现检修功能、提升检修能力的重要因素。对动车段高级修主要工艺及总平面布置进行研究,首先探讨了动车组高级修... 详细信息

动车段是承担动车组高级修的场所,是保证动车组安全、高效运营的重要基础设施,动车组高级修工艺流程复杂,合理的工艺设计是实现检修功能、提升检修能力的重要因素。对动车段高级修主要工艺及总平面布置进行研究,首先探讨了动车组高级修工作量及设施规模确定方法,提出了工作量及设施规模计算公式;然后对动车组三、四、五级修主要工艺进行分析,并列举了动车组五级修工艺流程;最后结合工艺流程,对动车组高级修总平面布置进行研究,创新提出了四、五级修联合厂房布置方案,系统阐述了动车组高级修设施布置要点。

关键词：动车段高级修主要工艺总平面动车组高速铁路

Catalytic Hydrogenation of Diacetyl Monoxime to Tetramethylpyrazine with the Soluble Transition Metal Catalysts

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1999年第8期10卷 701-704页

作者： Xiang Yu WANG Xiao Ming ZHENG Zhao Yin HOU (Institute of Catalysis, Zhejiang University (Xixi campus), Hangzhou 310028) (Department of Chemistry, zhengzhou University, zhengzhou 4.0052) Zhejiang Univ Inst Catalysis Hangzhou 310028 Peoples R China zhengzhou Univ Dept Chem Zhengzhou 450052 Peoples R China

Catalytic hydrogenation of diacetyl monoxime to tetramethylpyrazine, by the homogeneous catalysts generated in situ from some transition metal chlorides with triphenylphosphine in ethanol under H-2 pressure of 0.6 similar to 4.6 MPa at 100 similar to 150 degrees C, has been studied. The optimum H-2 partial pressure was observed at about 1.3 MPa. The maximum conversion of diacetyl monoxime and yield of tetramethylpyrazine were 97% and 90%, respectively.

关键词： diacetyl monoxime catalytic hydrogenation tetramethylpyrazine

在线全文

学校读者我要写书评

暂无评论

Rab18调控禽偏肺病毒C型复制的研究

中国兽医科学 2024年第4期54卷 433-440页

作者：张正洲王如嘉亓宇翔于瀚哲孟闯冯旭飞扬州大学兽医学院(比较医学研究院) 江苏扬州225009 扬州大学江苏高校动物重要疫病与人兽共患病防控协同创新中心江苏扬州225009 扬州大学江苏省人兽共患病重点实验室江苏扬州225009

为探究Rab18调控禽偏肺病毒C型(aMPV/C)复制的分子机制,将aMPV/C感染A549细胞后进行激光共聚焦显微镜观察并用Image J软件分析共定位系数。结果显示,Rab18与aMPV/C N蛋白均在细胞质中表达并存在共定位,而未接毒组无明显的N蛋白荧光信号... 详细信息

为探究Rab18调控禽偏肺病毒C型(aMPV/C)复制的分子机制,将aMPV/C感染A549细胞后进行激光共聚焦显微镜观察并用Image J软件分析共定位系数。结果显示,Rab18与aMPV/C N蛋白均在细胞质中表达并存在共定位,而未接毒组无明显的N蛋白荧光信号,接毒组共定位系数极显著高于未接毒组(P<0.01)。将pCMV-Flag-Rab18、pCMV-Flag、siRab18以及siNC分别转染A549细胞,接种aMPV/C后收集细胞和细胞上清,分别用qPCR、Western-blot以及TCID50检测aMPV/C N基因的转录水平、N蛋白的表达水平以及病毒效价。结果显示,过表达Rab18后aMPV/C N基因的转录水平、N蛋白的表达水平以及病毒效价均极显著升高(P<0.01),而干扰Rab18表达后N基因的转录水平、N蛋白的表达水平以及病毒效价均极显著降低(P<0.01)。将pCMV-mcherry-Rab18分别与可融合表达GFP蛋白的aMPV/C各基因的质粒共转染A549细胞后进行激光共聚焦显微镜观察。结果显示,Rab18均可与aMPV/C各蛋白在细胞质中发生共定位。将pCMV-Flag-Rab18分别与可融合表达GFP蛋白的aMPV/C各基因的质粒共转染HKE293T细胞后进行免疫共沉淀试验。结果显示,Rab18与aMPV/C N、M2-1和L2共表达的IP样品中出现特异性条带,其他蛋白无特异性条带。这些结果表明,Rab18通过与N、M2-1和L2蛋白的互作影响aMPV/C的复制。研究结果为进一步深入解析Rab18调控aMPV/C复制的分子机理奠定了基础。

关键词：禽偏肺病毒C型 Rab18 病毒复制相互作用表达水平

ACCURACY ANALYSIS OF 12-PARAMETER RECTANGULAR PLATE ELEMENTS WITH GEOMETRIC SYMMETRY

在线全文

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 2000年第2期13卷 146-151页

作者： SHI Dongyang CHEN Shaochun (Department of Mathematics, zhengzhou University, zhengzhou 4.0052, China) 郑州大学数学系河南郑州 450052 郑州大学数学系河南郑州

In this paper, it is proved that the double set parameter rectangular plate elements with geometric symmetry possess a very special convergence property, i.e., the consistency error due to nonconformity is of order O(h2) which is one order higher than that of ACM element and rectangular generalized conforming element proposed by Y. Q. Long, although all these elements have the same asympotical rate of convergence O(h) in the energy norm. This particular property seems to be never seen before for other nonconforming rectangular plate elements.

关键词： Nonconforming rectangular element geometric symmetry special convergence.

Equitable Coloring of Complete r-partite Graphs

在线全文

学校读者我要写书评

暂无评论

Chinese Quarterly Journal of Mathematics 2004年第4期19卷 412-415页

作者： WANG Xiu-mei(Department of Mathematics, zhengzhou University, zhengzhou 4.0052, China) Department of Mathematics Zhengzhou University Zhengzhou 450052 China

A graph is equitably k-colorable if its vertices can be partitioned into k independent sets of as near equal sizes as possible. In this paper, we determine a sufficient and necessary condition for which a complete r-p... 详细信息

关键词： complete r-partite graph equitably k-colorable equitable chromatic number

Management of Otitis Media with Effusion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Otology 2008年第2期3卷 68-75页

作者： LIU Li-min, DONG Min-ming Department of Otolaryngology, First Affiliated Hospital of zhengzhou university, zhengzhou, 4.0052 Department of Otolaryngology First Affiliated Hospital of Zhengzhou university Zhengzhou 450052

Otitis media with effusion is one of the most common diseases in children. Its treatment remains controversial. Clinical practice guidelines of OME allow watchful waiting for 3 months before treatment if the child with OME is not at risk for speech/language/or learning problems. Tympanostomy tube insertion is the preferred initial procedure when a child becomes a surgical candidate. Complementary or alternative medicine is not recommended as a treatment for OME. This paper provides a systematic review of management of OME, which we hope will be helpful for clinicians.

关键词： Otitis media with effusion clinical protocols treatment

Properly Weighted Independence Systemsand Applications to Scheduling Problems

在线全文

学校读者我要写书评

暂无评论

运筹学学报 1997年第2期1卷 41-47页

作者： YIXUN LIN JUNQIANG DENG(Department of Mathematics, zhengzhou University, zhengzhou, Henan 4.0052) 郑州大学数学系河南郑州

The theory of independence systems is powerful in combinatorial optimization. Itis well-known that the greedy algorithm solves the maximum weight independent setproblem for a matroid with any weight function. However, this may not be true fora general independence system. In this paper we propose a condition on the weightfunctions (called the proper weight functions) that guarantees the greedy solvability foran independence system. Applying this general result to scheduling problems, some newinsights, as well as new algorithms, are obtained.

关键词： Combinatorial optimization Independence system Greedy algorithm Scheduling

Effect of Initial Microstructure on Warm Deformation Behavior of 45 Steel

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2012年第8期19卷 75-78页

作者： ZHAO Xin1, YANG Xiao-ling2, JING Tian-fu3 (1. The Sixth Department, zhengzhou Institute of Aeronautics, zhengzhou 450015, Henan, China 2. zhengzhou Zhongxing Basic Constructions Development Co Ltd, zhengzhou 450015, Henan, China 3. State Key Laboratory of Metastable Materials Science and Technology, Qinhuangdao 066004, Hebei, China) [a] The Sixth Department Zhengzhou Institute of Aeronautics Zhengzhou 450015 Henan China [b] zhengzhou Zhongxing Basic Constructions Development Co Ltd Zhengzhou 450015 Henan China [c] State Key Laboratory of Metastable Materials Science and Technology Qinhuangdao 066004 Hebei China

In order to investigate the effect of initial microstructure on warm deformation behavior, some specimens of 45 steel were annealed and some quenched. Then the specimens were isothermally compressed on a Gleeble 3500 machine. The deformation temperature range was 550 to 700 ℃ and the strain rate range was 0.001 to 0.1 s-1. An optical microscope (OM) and a transmission electron microscope (TEM) were used to study the microstructures. The results show that the microstructure of annealed specimens is ferrite and pearlite and that of quenched specimens is martensite. The flow stress of quenched specimens is higher than that of annealed ones at 550 ℃ when strain rates are greater than 0.001 s-1. However, at 600 to 700 ℃ and strain rate of 0.001 s-1, the whole flow curves of quenched specimens are below that of annealed ones. Under the rest conditions, the flow stress of quenched specimens is higher at the beginning of compression and then the opposite is true after the strain is greater than a critical value. The microstructure examination proves that the tempering and dynamic recrystallization easily occur in the specimens with martensite during warm compression, which results in the above phenomena.

关键词： warm deformation flow stress steel microstructure