检索结果-南通市图书馆

Precise Determination of Separation Between Spherical Attracting Masses in Measuring the Gravitational Constant

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第8期18卷 1012-1014页

作者： LUO Jun WANG Wen-Min hu zhong-kun WANG Xue-Li Department of Physics Huazhong University of Science and TechnologyWuhan 430074

A rotating gauge method is used to measure the span between two spheres with high precision in determination of the gravitational constant G.A rectangular gauge block slightly shorter than the span is located horizontally between two spheres,and the angle between two symmetric bounding points during rotation can be determined by measuring the shift of a laser beam passing through an optical plate fixed on the gauge *** results show that the uncertainty in the determination of the span between the two spheres is less than 0.5μm.

关键词： gauge spheres rotating

Determination of the Unperturbed Period of a Torsion Pendulum in the Time-of-Swing Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第12期16卷 867-869页

作者： LUO Jun hu zhong-kun LUO Xu-jun WU Zi-gang Department of Physics Huazhong University of Science and TechnologyWuhan 430074

A symmetric disc-shaped torsion pendulum was designed to study the nonlinear effects of the torsion fiber. It was showed that the period of the pendulum decreases with the amplitude of the oscillation. Determination of the unperturbed period through a fit to measured data of the period variation with amplitude shows that this systematic error in the measurement of Newtonian gravitational constant G by the time-of-swing method can be reduced by an order of the magnitude at least.

关键词： oscillation. torsion perturbed

Proposed Test of the Equivalence Principle with Rotating Cold Polar Molecules

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第8期29卷 29-32页

作者： hu zhong-kun KE Yi DENG Xiao-Bing ZHOU Ze-Bing LUO Jun Key Laboratory of Fundamental Physical Quantities Measurement of Ministry of Education School of PhysicsHuazhong University of Science and TechnologyWuhan 430074

We propose a novel scheme for testing the equivalence principle with rotating cold polar molecules whose angular momenta are polarized at different *** in specific rotational states are selected out via the hexapole state-selection technique and the gravitational acceleration g of molecules is measured by measuring the Doppler shift of the molecules free falling in the gravitational *** other possible methods of rotating molecules and measuring g are also ***,as the test masses,have higher rotating speed and smaller dimension in comparison with mechanical gyroscopes and may open a new way for testing the equivalence principle and the possible coupling between rotation and gravity.

关键词： field rotating testing

Risk factors for non-sentinel lymph node metastases in breast cancer patients with positive sentinel lymph nodes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2008年第20期121卷 2107-2109页

作者： ZHANG Tao WANG Hong CHEN Bao-ping ZHANG Hai-song WEI Xi-liang FU Ying LI zhong hu Geng-kun Department of Oncology Surgery Affiliated Hospital of Hebei University Baoding Hebei 071000 China

The presence or absence of metastases in the axillary lymph nodes has remained the most powerful prognostic factor in breast carcinoma. Axillary lymph node dissection （ALND） is the standard procedure for obtaining this information. However, postoperative complications are common. Sentinel lymph node （SLN） biopsy has been proposed as a potential alternative to ALND for staging breast carcinoma. This technique has been shown to be sensitive and specific for predicting the status of the axillary lymph nodes. Furthermore, it has the potential advantage of decreasing the morbidity associated with ALND.

关键词： breast cancer sentinel lymph node biopsy non-sentinel lymph node metastasis

Multicomponent polymerization of elemental sulfur,difluoromethylene phosphobetaine and aryl silyl ethers toward aromatic poly(O,O′-monothiocarbonate)s

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Yongjiang Yu Rongrong hu Ben zhong Tang State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology School of Science and Engineering Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong Kong AIE Institute

Polythiocarbonates with similar structures to polycarbonates, have emerged as a group of promising sulfur-containing polymers with a range of practical applications, taking advantages of their excellent optical properties, good thermal stability and filmforming ability, and so on. However, the synthesis of polythiocarbonates generally suffered from mixed isomeric structures of repeating units, and hazardous sulfur-containing reagents. In this work, an efficient multicomponent reaction of elemental sulfur,difluoromethylene phosphobetaine（PDFA）, and aryl silyl ethers was designed with the assistance of organic base 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene（MTBD） to produce 12 kinds of O,O′-monothiocarbonate compounds in up to 93% yields,taking advantages of the unique chemical property of difluorocarbene, and the deprotection of silyl group by F-generated from PDFA. Most importantly, the MTBD-assisted multicomponent polymerization of bis（aryl silyl ether）s, elemental sulfur, and PDFA was developed, affording 12 kinds of poly（O,O′-monothiocarbonate）s with well-defined structures, high Mws of up to16900 g/mol and high yields（up to 99%）. These poly（O,O′-monothiocarbonate）s possessed good film-forming properties and thermal stability, high light refractive indices and transmittance. The facile synthesis of these polymonothiocarbonates might pave the way for the development of promising sulfur-containing polymer materials.

关键词：

基于需求导向的工科院校国际人才英语能力的培养研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

林区教学 2019年第5期 64-66页

作者：胡忠坤哈尔滨华德学院哈尔滨150025

新一轮科技革命、产业变革与"新工科"建设的背景,对工程科技人才的英语能力提出更高的国际化要求。工科院校的英语教学应以需求为导向,从教学模式、校企合作、教学目标、教学材料、教学方法、教学评价、师资建设等方面进行有效的教学改... 详细信息

新一轮科技革命、产业变革与"新工科"建设的背景,对工程科技人才的英语能力提出更高的国际化要求。工科院校的英语教学应以需求为导向,从教学模式、校企合作、教学目标、教学材料、教学方法、教学评价、师资建设等方面进行有效的教学改革,使高校培养的英语人才更好地服务于行业需求。

关键词：工科院校英语教学需求导向

在线全文

学校读者我要写书评

暂无评论

预制语块在翻译过程中的优势效应及应用研究

黑龙江生态工程职业学院学报 2019年第2期32卷 152-153,157页

作者：胡忠坤哈尔滨华德学院黑龙江哈尔滨150025

预制语块在语言理解与产出的过程中起到了重要作用,这使其与翻译的质量与效率密不可分。翻译过程中预制语块提取的问题主要体现在预制语块的表现能力和提取质量等方面,对语块提取影响因素与错误分析有利于认知预制语块在翻译过程中的优... 详细信息

预制语块在语言理解与产出的过程中起到了重要作用,这使其与翻译的质量与效率密不可分。翻译过程中预制语块提取的问题主要体现在预制语块的表现能力和提取质量等方面,对语块提取影响因素与错误分析有利于认知预制语块在翻译过程中的优势效应。在翻译能力的培养中要建立双语预制语块心理词库和预制语块翻译输出模型,有效利用语块的认知资源,构建跨库关联,实现有效的解码与编码。

关键词：预制语块翻译优势效应输出模型

在线全文

学校读者我要写书评

暂无评论

高校英语写作课程中诊断性语言测评应用研究

黑龙江生态工程职业学院学报 2020年第2期33卷 143-145页

作者：胡忠坤哈尔滨华德学院黑龙江哈尔滨150025

反馈的缺乏成为英语写作教学的重要障碍。诊断性语言测评与错误分析理论的结合为写作教学提供了有效的反馈信息。诊断样本错误分析的结果表明,学习者的错误主要有实体错误、文本错误、语篇错误三个类别,其错误根源主要来自语际负迁移和... 详细信息

反馈的缺乏成为英语写作教学的重要障碍。诊断性语言测评与错误分析理论的结合为写作教学提供了有效的反馈信息。诊断样本错误分析的结果表明,学习者的错误主要有实体错误、文本错误、语篇错误三个类别,其错误根源主要来自语际负迁移和语内负迁移等。反馈信息可以帮助学习者形成更准确的假设,并在语言使用中做出更好的调节。

关键词：英语写作课程诊断性测评错误分析

在线全文

学校读者我要写书评

暂无评论

新闻标题中的语音隐喻及功能

黑龙江教育学院学报 2011年第5期30卷 136-137页

作者：胡忠坤哈尔滨工业大学华德应用技术学院哈尔滨150025

为了吸引读者的注意力和兴趣,新闻标题中往往采用各种方法来增强吸引力。语音隐喻是从语音角度探讨的"跨域喻指"的隐喻现象。基于语音相似的语音隐喻能够增加标题的魅力,产生画龙点晴的效果。

关键词：新闻标题语音隐喻功能