检索结果-南通市图书馆

One-Point Extensions of t-Koszul Algebras

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第6期23卷 965-972页

作者： zhi cheng Department of Mathematics Anhui Normal University Wuhu 241000 P. R. China Department of Mathematics University of Science and Technology of ChinaHefei 230026 P. R. China Department of Mathematics University of Science and Technology of China Hefei 230026 P. R. China USTC Shanghai Institute for Advanced Studies Shanghai 201315 P. R. China

We introduce the category of t-fold modules which is a full subcategory of graded modules over a graded algebra. We show that this subcategory and hence the subcategory of t-Koszul modules are both closed under extensions and cokernels of monomorphisms. We study the one-point extension algebras, and a necessary and sufficient condition for such an algebra to be t-Koszul is given. We also consider the conditions such that the category of t-Koszul modules and the category of quadratic modules coincide.

关键词： graded algebra Koszul algebra Koszul module

Pyrolysis-GC/MS of Menthyl Esters of N-Benzoxycarbonyl Amino Acid

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2010年第2期26卷 198-203页

作者： MAO Mao GU cheng-zhi YIN Hao SONG qin-hua LI Qlan-rong Hefei National Laboratory for Physical Sciences at Microscale Department of Chemistry University of Science and Technology of China Hefei 230026 R R. China Department of Chemistry Shihezi University Shihezi 832003 P. R. China

With the aid of a Pyrolysis-GC/TOF MS technique, the pyrolysis behaviour of two menthyl esters of N-benzoxycarbonyl amino acid was investigated. A clear pattern emerges involving the cleavage of the bond linking the menthyl ring to the carboxy group, followed by further degradation of the fragments. The major pyroproducts were p-menth-l-ene pyrolysed at a higher temperature or p-menth-2-ene pyrolysed at a lower temperature, and various derivatives of cyclohexene pyrolyzed from the menthyl ring. In addition, some of the products were also iden- tified as derivatives of benzene from the pyrolysis of benzyloxyl moiety.

关键词： Menthyl esters of N-benzoxycarbonyl amino acid Py-GC/MS Pyrolysis

EGFR野生型肺腺癌患者一线化疗方案选择影响因素分析

在线全文

学校读者我要写书评

暂无评论

中华肿瘤防治杂志 2016年第18期23卷 1239-1243页

作者：周承志秦茵茵谢展鸿林心情张建恒谢晓鸿张洁霞欧阳铭呼吸疾病国家重点实验室呼吸疾病国家临床研究中心广州医科大学附属第一医院广州呼吸疾病研究所广东广州510120

目的晚期肺癌一线化疗方案的有效率无明显差异,而在不良反应和药物经济学方面存在明显区别。本研究探讨晚期表皮生长因子受体(epidermal growth factor receptor,EGFR)野生型肺腺癌患者一线化疗方案应用状况并分析其原因。方法回顾性分... 详细信息

目的晚期肺癌一线化疗方案的有效率无明显差异,而在不良反应和药物经济学方面存在明显区别。本研究探讨晚期表皮生长因子受体(epidermal growth factor receptor,EGFR)野生型肺腺癌患者一线化疗方案应用状况并分析其原因。方法回顾性分析广州医科大学附属第一医院2009-12-01-2014-11-30收治的738例晚期EGFR野生型肺腺癌患者5种不同一线方案应用状况和影响因素,观察其近期疗效和不良反应。结果临床常用5种不同一线方案的患者例数分别为:吉西他滨含铂双药(GP组)358例,紫杉醇含铂双药(TP组)157例,多西他赛含铂双药(DP组)99例,培美曲塞含铂双药(PP组)93例,长春瑞滨含铂双药(NP组)31例。5组之间疗效差异无统计学意义,仅PP方案的疾病控制率较其他4个方案为优,χ2=4.01,P=0.038。5种方案不良反应:NP方案在3级以上白细胞减少方面明显高于其他方案,χ2=3.33,P=0.042;TP和DP方案在口腔炎、周围神经炎、3级及以上脱发的发生率方面明显高于其他方案,均PTP 21.27%>DP 13.41%>PP12.60%>NP 4.20%,这与5位制定化疗方案的主任医师对5个不同一线方案的平均评分排序完全一致。方案选择具体原因分析提示不良反应、使用便捷性、经济原因、医保政策4个因素是影响方案选择的主要原因,而疗效因素由于其本身差异并不明显,故并非是影响方案选择的主要原因。NP方案由于其不良反应和使用便捷性评分较低而总评分最低,而GP方案由于各方面均无明显劣势而总评分最高。结论过去5年晚期EGFR野生型肺腺癌患者常用的5种一线方案使用率顺序依次为GP>TP>DP>NP>PP。5种方案疗效未见明显差异,并非是影响方案选择的主要原因。方案的选择与制定方案的具体医生推荐有明显相关性,而具体原因主要集中在不良反应、使用便捷性、经济原因和医保政策4个因素。

关键词： EGFR野生型肺腺癌化疗近期疗效

Crystal Form Transition during Heating of Solvent-induced Crystalline Syndiotactic Polystyrene

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2000年第10期11卷 931-932页

作者： cheng Shen ZHU Hong Jing DOU Su qin HE zhi Shen MO Material Engineering Department Zhengzhou UniversityZhengzhou 450052 Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun 130022

The phase transition of two kinds of solvent-induced crystalline syndiotactic polystyrene (sPS). gamma-sPS and delta(c)-sPS, has been studied via WAXD and DSC. gamma-sPS transform to a-sPS at 195-225 degrees C before melt during heating, whereas delta(e)-sPS transform to first gamma-sPS and then a-sPS at 100-200 degrees C and 200-215 degrees C, respectively. The transition of delta(e)-gamma and gamma-a occurs for below melting point of sPS indicates they are all solid-solid transition.

关键词： crystal form transition gamma-sPS delta(e)-sPS alpha-sPS

Electromagnetic scattering and imaging simulation of extremely large-scale sea-ship scene based on GPU parallel technology

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2024年第2期22卷 16-23页

作者： cheng-Wei Zhang zhi-qin Zhao Wei Yang Li-Lai Zhou Hai-Yu Zhu Southwest China Institute of Electronic Technology Chengdu610036China School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China Tencent Company Shenzhen518054China

Aiming to solve the bottleneck problem of electromagnetic scattering simulation in the scenes of extremely large-scale seas and ships,a high-frequency method by using graphics processing unit(GPU)parallel acceleration technique is *** the implementation of different electromagnetic methods of physical optics(PO),shooting and bouncing ray(SBR),and physical theory of diffraction(PTD),a parallel computing scheme based on the CPU-GPU parallel computing scheme is realized to balance computing ***,a multi-GPU framework is further proposed to solve the computational difficulty caused by the massive number of ray tubes in the ray tracing *** using the established simulation platform,signals of ships at different seas are simulated and their images are achieved as *** is shown that the higher sea states degrade the averaged peak signal-to-noise ratio(PSNR)of radar image.

关键词： Multi graphics processing unit Radar imaging Sea-ship Shooting and bouncing rays

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

JBOSS及其在电子政务系统中的应用

微机发展 2004年第2期14卷 52-54页

作者：戴志诚秦肖臻汪秉文姜新华中科技大学控制科学与工程系湖北武汉430074

随着通信、互联网技术和计算机技术的发展,电子政务越来越受到人们的关注,而J2EE提供了基于Web应用的应用系统标准模型,它为企业级应用开发提供了一个可扩展的解决方案,文中根据作者在实际项目应用中的切身体会,将J2EE应用到电子政务系... 详细信息

随着通信、互联网技术和计算机技术的发展,电子政务越来越受到人们的关注,而J2EE提供了基于Web应用的应用系统标准模型,它为企业级应用开发提供了一个可扩展的解决方案,文中根据作者在实际项目应用中的切身体会,将J2EE应用到电子政务系统中。介绍了JBOSS的安装、配置和EJB的部署,论述了JBOSS在电子政务系统中的应用,并给出了其中一个EJB开发的实例,论述了实现步骤及相关的关键技术。这种应用模型,实现了用户界面与数据处理、数据内容与显示完全分离,系统运行稳定可靠。

关键词： JBOSS 数据库数据访问电子政务系统开放源码

Hausdorff Measures for a Class of Homogeneous Cantor Sets

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2013年第1期29卷 117-122页

作者： cheng-qin QU Department of Applied Mathematics South China University of Technology

We consider the homogeneous Cantor sets which are generalization of symmetric perfect sets, and give a formula of the exact Hausdorff measures for a class of such sets.

关键词： Hausdorff measure Homogeneous Cantor set convexity

羊BLG基因5′和3′调控区克隆及其调控GFP基因在乳腺细胞的表达

在线全文

学校读者我要写书评

暂无评论

生物工程学报 2002年第1期18卷 112-116页

作者：刘明军李文蓉武坚黄俊成郭志勤曲新勇 Paul Kroon 新疆畜牧科学院乌鲁木齐830000 澳大利亚昆士兰大学生化系

and 3′ flanking region of ovine BLG were amplified from sheep genomic DNA according to the published whole sequence of ovine BLG and cloned to pGEM-T vector *** partially sequencing,the sequences of BLG 5′ and 3′ flanking were the same as that of publication *** recombinant structure used to direct exogenous gene especially to express in mammary gland was constructed by joining 4.2kb 5′ flanking with 2.1kb 3′ *** order to assess the efficiency of BLG regulatory elements,green fluorescent protein (GFP) gene as a reporter was fused with BLG construct and transfected the mammary epithelial cells (TD47).Through observation under UV microscope and detection by fluorometer,it is demonstrated that the GFP has been successfully expressed in TD47 cell *** virtue of direct observation and quantitative analysis,the BLG-GFP construct can be served as a model for the quick assessment of mammary gland expression construct.

关键词：羊BLG基因 3′调控区调控 GFP基因羊乳球蛋白基因克隆绿色荧光蛋白乳腺细胞系表达

Preparation and compression behavior of Fe-Ni-P/porous-Fe/Fe-Ni-P composites

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2022年第8期29卷 1334-1341页

作者： Yu-xuan Liu Shuai-jiang Yan cheng-song Zhang Da-zhi Chen qin Xu Guo-dong Cui Key Lab of Advanced Technology of Materials of Education Ministry School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031SichuanChina Yibin Institute of Southwest Jiaotong University Yibin 644000SichuanChina

Porous-Fe-N alloys designed for light weight or energy absorption are inevitably facing the compromise of deteriorated mechanical properties. To optimize their mechanical properties, here a novel Fe-Ni-P/porous-Fe/Fe-Ni-P composite with sandwich structure was fabricated by spark plasma sintering and further strengthened via cryogenic treatment. Based on the principle of solid phase sintering and transient liquid phase sintering, porous core and dense outer layers formed simultaneously after co-sintering. The as-fabricated samples show excellent compressive strength of 1708 MPa, and after cryogenic treatment, due to the sufficient martensitic transformation, Fe-Ni-P outer layers show substantially increased hardness from 246.7 to 386.6 HV_(0.1)while the porous-Fe core remains unchanged. And the compressive strength maintains 1424 MPa despise the aggravated incongruity of deformation. The ratio of constituent microhardness R has been proposed to represent the hardness matching, and with decreasing R, the incongruity of deformation is intensified, and the nominal compressive strength is reduced.

关键词： Metallic composite Sandwich structure Spark plasma sintering Mechanical property