检索结果-南通市图书馆

The geographical distribution of grey wolves (Canis lupus) in China:a systematic review

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2016年第6期37卷 315-326页

作者： Lu WANG Ya-Ping MA Qi-Jun ZHOU Ya-Ping ZHANG Peter SAVOLAINEN Guo-Dong WANG State Key Laboratory for Conservation and Utilization of Bio-resources in Yunnan Key Laboratory for Animal Genetic Diversity and Evolution of High Education in Yunnan ProvinceYunnan University State Key Laboratory of Genetic Resources and Evolution Yunnan Key Laboratory of Molecular Biology of Domestic AnimalsKunming Institute of ZoologyChinese Academy of Sciences Science for Life Laboratory Department of Gene TechnologyKTH-Royal Institute of Technology

The grey wolf （Canis lupus） is one of the most widely distributed terrestrial mammals, and its distribution and ecology in Europe and North America are largely well described. However, the distribution of grey wolves in southern China is still highly controversial. Several well-known western literatures stated that there were no grey wolves in southern China, while the presence of grey wolves across China has been indicated in A Guide to the Mammals of China, published by Princeton university press. It is essential to solve this discrepancy since dogs may have originated from grey wolves in southern China. Therefore, we systematically investigated Chinese literatures about wild animal surveys and identified more than 100 articles and books that included information of the distribution of grey wolves in China. We also surveyed the collections of three Chinese natural museums and found 26 grey wolf skins specimens collected across China. Moreover, we investigated the fossil records in China and identified 25 archaeological sites with wolf remains including south China. In conclusion, with the comprehensive summary of Chinese literatures, museum specimens and fossil records, we demonstrate that grey wolves do distribute across all parts of the Chinese mainland, including the most southern parts.

关键词： China Grey wolf Distribution Conservation

在线全文

学校读者我要写书评

暂无评论

基于多模型的平版胶印过程墨流控制

中国印刷与包装研究 2009年第1期1卷 102-103页

作者： Cristofer Englund Antanas Verikas Intellignet Systems Laboratory School of Information Science Computer and Electrical Engineering Department of Applied Electronics Kaunas University of Technology LT-51368

为控制平版胶印过程中的油墨流动,本文提出了一种基于多模型的控制系统。该控制系统包括一个由4对正反向模型组成的模型池。每组模型对多个可能的控制信号进行评价,生成最优控制信号以实时控制印刷。该控制系统在报纸印刷车间的正常印... 详细信息

为控制平版胶印过程中的油墨流动,本文提出了一种基于多模型的控制系统。该控制系统包括一个由4对正反向模型组成的模型池。每组模型对多个可能的控制信号进行评价,生成最优控制信号以实时控制印刷。该控制系统在报纸印刷车间的正常印刷生产中进行实验,实验结果表明,本文提出的模型及其控制系统能够使印刷机的生产效果达到期望水平。

关键词：多模型过程控制自适应模型印刷机彩色印刷神经网络

在线全文

学校读者我要写书评

暂无评论

硝苯地平控释包芯片的制备与体外释放度考察

海峡药学 2018年第10期30卷 13-17页

作者：何昀贾璐瑶周勇严真杨磊尹莉芳 YU Bo 中国药科大学药剂学教研室南京211198 China Pharmaceutical university

目的制备硝苯地平(Nifedipine,NF)包芯片,并考察其体外释放行为。方法以释放度和工艺参数为指标,通过单因素试验确定辅料种类并完成初步处方筛选,采用正交试验优化得到最优处方。考察不同处方、不同介质条件对释放度的影响。结果内芯片... 详细信息

目的制备硝苯地平(Nifedipine,NF)包芯片,并考察其体外释放行为。方法以释放度和工艺参数为指标,通过单因素试验确定辅料种类并完成初步处方筛选,采用正交试验优化得到最优处方。考察不同处方、不同介质条件对释放度的影响。结果内芯片选择HPC-L作为骨架材料,其与填充剂的比例为2∶3;外层片选择HPC-L与HPC-M以3∶1的比例联用;尤特奇RS PO用量为24%。所制备包芯片在各介质中的释放曲线均与参比制剂相似,f_2大于50。结论所制备的包芯片具有双相释药行为,且工艺稳定可重现,具有良好的应用前景。

关键词：硝苯地平包芯片干法包衣双相释药控释

毛细管气相色谱法同时测定盐酸氨溴索中乙醇、醋酸和甲苯残留量

在线全文

学校读者我要写书评

暂无评论

药物分析杂志 2005年第4期25卷 466-468页

作者：黄京芳徐沄彭方林美清武汉大学化学与分子科学院武汉430072 School of Chemistry university of Bristol Cantock's close BS8 1Ts 武汉市药品检验所武汉430012

目的:建立盐酸氨溴索原料药中乙醇、醋酸和甲苯3种有机溶剂残留量的测定方法。方法:采用直接进样法,二甲基甲酰胺为溶剂。气相色谱条件:采用 DM-624(化学组成:6%氰丙苯基-94%二甲基聚氧硅烷)毛细管气相色谱柱,30m×0.53mm×3.00μm。程... 详细信息

目的:建立盐酸氨溴索原料药中乙醇、醋酸和甲苯3种有机溶剂残留量的测定方法。方法:采用直接进样法,二甲基甲酰胺为溶剂。气相色谱条件:采用 DM-624(化学组成:6%氰丙苯基-94%二甲基聚氧硅烷)毛细管气相色谱柱,30m×0.53mm×3.00μm。程序升温:60℃保持3min,以每分钟5℃升至108℃,再以每分钟30℃升至180℃,保持5min。氮气(纯度:99.9999%)为载气,柱前压为42kPa。分流进样,分流比1∶20。进样口温度250℃,FID 检测器,检测器温度270℃。结果:3种溶剂残留均达到良好分离。乙醇、醋酸和甲苯线性范围分别为15.85-396.3μg·mL^(-1)(r=0.9995),38.33-574.9μg·mL^(-1)(r=0.9999),0.8360-20.90μg·mL^(-1)(r=0.9996,);回收率分别为95.2%-101.9%(RSD≤4.3%,n=3),95.0%-102.3%(RSD≤3.9%,n=3),94.8%-102.0%(RSD≤4.8%,n=3);检出限分别小于20μg·g^(-1),20μg·g^(-1),5μg·g^(-1)。结论:本方法简单、快捷且灵敏度高,可以用于盐酸氨溴索中乙醇、醋酸、甲苯3种有机溶剂残留量的控制。

关键词：盐酸氨溴索毛细管气相色谱法乙醇甲苯醋酸同时测定有机溶剂残留量二甲基甲酰胺直接进样法测定方法聚氧硅烷化学组成色谱条件程序升温分流进样线性范围检测器原料药色谱柱 30m 回收率检出限 5μg 灵敏度

FRICTION COEFFICIENT OF CLUSTER DIAMOND-DISPERSED ALUMINUM COMPOSITE BY COMpressION SHEARING METHOD

在线全文

学校读者我要写书评

暂无评论

FRICTION COEFFICIENT OF CLUSTER DIAMOND-DISPERSED ALUMINUM C...

Effect of Mechanical Treatment Temperature on Electrical Properties and Crystallite Size of PVDF Film

作者： Noboru Nakayama Hiroyuku Takeishi Dept. of Machine Intelligence and Systems Eng. Akita Prefectural UniversityYurihonjyo Akita 015-0055 JAPAN Dept.of Science and Mech.Eng. Chiba Inst. of Thech. NarashinoChiba 275-8588 JAPAN

＜正＞In this paper, pure Aluminum and cluster diamond-dispersed aluminum composites were made by the compression shearing method. The friction coefficient, density, mechanical properties, and microstructures of compacted powders were investigated. The addition of 1vol. % CD to Al improved the friction coefficient. The average friction coefficients of Al, 1 vol. % CD sample, and 5vol. % CD sample indicate 0.91, 0.71 and 0.83, respectively. Comparing with one of Al, these values are reduction of 22% and 9% , respectively. However, the 5vol % CD solidified by compression shearing method and dynamic compaction method shows an increase in friction coefficient. The pores can be observed at 5% CD sample. It is considered that the lubricating ability of the Al composite containing 5% CD decreases by the pores, consequently the friction coefficient is increased. In compression shearing, the oxidation layer formed on the Al powder surface was destroyed. However, the bonding of the powders was lower in hot press and dynamic compacting, since it was not possible to sufficiently destroy the oxidation layer. Therefore, the friction coefficient of composite material molded by compression shearing is lower than the one of composite material molded by hot press and dynamic compacting.

关键词： Cluster diamond Friction properties Compression shearing method

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Advances in Materials Physics and Chemistry 2013年第1期3卷 71-76页

作者： Ambran Hartono Suparno Satira Mitra Djamal Ramli Ramli Herman Bahar Edi Sanjaya Department of Physics Faculty of Mathematics and Natural Sciences Universitas Negeri Padang Padang Indonesia Department of Physics Faculty of Science and Technology Islamic State University Syarif Hidayatullah Jakarta Indonesia Theoretical High Energy Physics and Instrumentation Research Group Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Bandung Indonesia

Fabrication of PVDF films has been making using Hot Roll press. Preparation of samples carried out for nine different temperatures. This condition is carried out to see the effect of temperature fabrication on electrical properties and crystallite size of PVDF films. The electrical properties like as surface resistivity are discussion focus in this paper. Surface resistivity properties of PVDF can be improved by mechanical treatment on the varying film thickness and the temperature. To obtain the diffraction pattern of sample characterization is performed using X-Ray Diffraction. Crystallite size of PVDF films calculate from broadening pattern of X-Ray Diffraction. Furthermore, from the diffraction pattern calculated β fraction and crystallite size, for calculation to determine the crystallite size of the sample by using the Scherrer equation. Has been obtained an increase piezoelectric properties of PVDF films that characterized by increasing β fraction. Have been obtained β fraction increased from 25.4% up to 44% for temperatures of 130°C up to 170°C, respectively. Resistivity value has been obtained at temperature 130°C up to 170°C, decreased from 1.23 × 104 Wm up to 0.21 × 104 Wm respectively. From the experimental results and the calculation of crystallite sizes obtained for the samples with temperature 130°C up to 170°C respectively are increased from 7.2 nm up to 20.54 nm. These results indicate that mechanical treatment caused increase β fraction and decrease surface resistivity. Increasing temperatures will also increase the size of the crystallite of the sample. This happens because with the increasing temperature causes the higher the degree of crystallization of PVDF film sample is formed, so that the crystallite size also increases.

关键词： Crystallite Size PVDF Roll Hot press Scherrer Equation Surface Resistivity Temperature Different XRD

Effect of Pursuit Eye Movement and Attentional Allocation on Perceptual-Motor Prediction in the Speed Anticipation Reaction Test

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

Psychology Research 2018年第9期8卷 435-442页

作者： Koji Sakai Kyoto Koka Women's university Ukyo-ku Kyoto Japan

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

Preface

Science China(Physics,Mechanics & Astronomy) 2011年第5期54卷 803-803页

作者： Prof. WANG ChongYu Academician in Chinese Academy of Sciences Department of Physics, Tsinghua university Chinese Academy of Sciences Department of Physics Tsinghua University Beijing China

Since a broad range of issues in material science involves multiple scales in space and time, multi-scale modeling and simulation of materials is currently one of the major research topics in material science worldwide. The various levels of material modeling can be roughly grouped into microscopic, mesoscopic, and macroscopic regimes. The microscopic scale refers to atomic level and lattice defect ensembles below the grain scale, from electronic first-principles to atomic molecular dynamics and Monte Carlo methods. Mesoscopic scale refers to lattice defect ensembles at the grain scale, and a typical simulation method at this scale is the phase field. Macroscopic scale refers to the sample geometry represented by a finite element method. These computer simulation methods of different scales have proven to be very useful for the study of fundamental physics, structure and properties of materials, which are not easily accessible via experiment. Moreover, with the advance in computing power, these methods have developed in a remarkable way, not only at the respective space and time scales but also at the couplings between the different scales. They are now becoming increasingly applicable for material processing and performance prediction in advanced engineering and technology applications.

关键词：多尺度建模材料科学蒙特卡罗方法晶格缺陷微观尺度模拟方法时间尺度分子动力学

An Inside and Outside Look Into Cultural Identity Construction of the FLTRP Cup English Public Speaking Contest--A Two Decade Review

在线全文

学校读者我要写书评

暂无评论

Sino-US English Teaching 2021年第10期18卷 274-278页

作者： HUANG Fengqiu Foreign Languages School University of Shanghai for Science and TechnologyShanghaiChina

As the admittedly top-level English competition in China,the Foreign Language Teaching and Research press(FLTRP)English Speech Contest has celebrated its 20-year *** competition not only provides a platform for the contestants to showcase their talent but also serves as a think tank for teachers to gain insight and inspiration as to the latest teaching methods and national educational *** essay finds evidence,by examining the given topics for prepared speech,to prove that increasing attention is being shifted from language skills acquisition to intercultural competence and cultural identity construction of the *** light of the ever-globalized world,the issue is further complicated by the emergence and wide use of new media which accents the influence of individuals in public diplomacy.

关键词： FLTRP Cup English Public Speaking cultural identity public diplomacy