检索结果-南通市图书馆

Analysis of Contact Melting Driven by Surface Heat Flux Around a Cylinder

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2008年第1期17卷 64-68页

作者： y.S.zhao W.z.chen F.R.Sun z.y.chen Faculty of Thermal Engineering College of Power and ShippingNaval University of EngineeringWuhan 430033China Faculty of Thermal Engineering College of Power and ShippingNaval University of EngineeringWuhan 430033China Professor

The contact melting of phase change material around a moving horizontal cylindrical heat source, which descended under its own weight, is investigated in this article. A melting model under constant surface heat flux is established. The analytical results for thickness and pressure distributions inside melt layer and steady melting velocity are obtained by using contact melting theory. The melting law is discussed, and compared with that of contact melting driven by temperature difference. It is found that quasi-steady melting velocity is determined by heat flux of heat source, and the variation of heat source density has less effect on melting velocity.

关键词： Contact melting horizontal cylinder phase change phenomena

Designs to Improve Capability of Neural Networks to Make Structural Predictions

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2023年第9期41卷 1477-1485,I0009页

作者： Tian-yao Wang Jian-Feng Li Hong-Dong zhang Jeff z.y.chen Department of Macromolecular Science State Key Laboratory of Macromolecular Engineering of PolymersFudan UniversityShanghai200438China Department of Physics and Astronomy University of WaterlooWaterlooN2L 3G1Canada

A deep neural network model generally consists of different modules that play essential roles in performing a *** optimal design of a module for use in modeling a physical problem is directly related to the success of the *** this work,the effectiveness of a number of special modules,the self-attention mechanism for recognizing the importance of molecular sequence information in a polymer,as well as the big-stride representation and conditional random field for enhancing the network ability to produce desired local configurations,is numerically *** models containing these modules are trained by using the well documented data of the native structures of the HP model and assessed according to their capability in making structural predictions of unseen *** specific network design of self-attention mechanism adopted here is modified from a similar idea in natural language *** big-stride representation module introduced in this work is shown to drastically improve network's capability to model polymer segments of strong lattice position correlations.

关键词： Deep neural network Self-attention mechanism Big-stride representation Conditional random methods

NUMERICAL SIMULATION OF INDUCTION SKULL MELTING PROCESS FOR TITANIUM-ALUMINIUM BASE ALLOy

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2004年第6期17卷 928-933页

作者： z.y.chen L.J.Xu F.T.Kong Q.Shu y.y.chen SchoolofMaterialsScienceandEngineering HarbinInstituteofTechnologyHarbin150001China

The mathematics model for temperature field of water-cooling copper crucible induction skull melting process was established. The program for simulating temperature field of melting process was developed with finite element method. The temperature field of the melting process for Ti-47Al-2Cr-2Nb alloy was calculated. During melting period, the temperature is raised gradually along radius augmentation direction. The elements of the charge near the crucible wall are molten first. The center elements of the charge are molten last. The melting time of the center element is just that of all the charge melting. The melting time of Ti-47Al-2Cr-2Nb alloy is 15min. In which, the charge was heated by low power 80kW for 9min and by high power 300kW for 6min. When melting Ti-47Al-2Cr-2Nb alloy, the loading power is nearly direct proportion to melt temperature. Increasing loading power may raise melt temperature. The best melting power of Ti-47Al-2Cr-2Nb alloy is 305-310kW. This is identical with the melting test and has guidance sense to the melting process of actual titanium alloy.

关键词： TiAl base alloy melting numerical simulation

Vesicle tubulation and pearling by induced adsorbing particles

在线全文

学校读者我要写书评

暂无评论

Vesicle tubulation and pearling by induced adsorbing particl...

REPRESENTATIONS OF ELETRIC FIELD BETWEEN TWO INCLINED CONDUCTOR BOARDS

中国化学会2016年软物质理论计算与模拟会议

作者： Jeff z.y.chen Department of Physics and Astronomy University of Waterloo

＜正＞We study a basic theoretical model for a deformable vesicle immersed in a solution of particles that can adsorb to one of the two surfaces of a *** model consists of an adsorption energy gain for the adsorbing p...

关键词：

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

REPRESENTATIONS OF ELETRIC FIELD BETWEEN TWO INCLINED CONDUC...

高频功率扩散加权成像对神经上皮肿瘤分级预测的诊断价值

Asia-Pacific Conference on Environmental Electromagnetics CEEM’2000

作者： L.H.Ren z.y.chen Institute of Electronics Academia Sinica 100080 Institute of Electronics Academia Sinica 100080

＜正＞INTRODUCTIONThe formulation E=U/d is traditionally used inthe measurement of GTEM *** is derivedfrom two parallel boards *** the basicstructure of GTENl cell is two inclined *** accurate formulation is requiredmentioned in several *** this papercalculation formulation is deduced afterinvestigating three models of inclined conductorboards and compared these results with the resultof formulation E=U/d.

关键词：

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

国际医学放射学杂志 2018年第1期 119-120页

作者： z.y.chen P.zho B.Lv M.Q.Liu y.Wang y.L.Wang 冀晓东 Department of Radiology Chinese PLA General Hospital

摘要目的回顾性分析高频功率(HFP)与最小表观扩散系数(Min ADC)对神经上皮肿瘤分级预测的诊断价值。方法采用3.0 T MRI系统对115例病人进行扩散加权成像

关键词：加权成像诊断价值神经上皮肿瘤高频功率

Some specific components of crude oils and their effects on wettability and corrosion of carbon 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

Some specific components of crude oils and their effects on ...

骨小梁成分分析MR成像对腰椎骨质疏松的综合评价

第十三届全国缓蚀剂学术讨论及应用技术经验交流会

作者： z.y.chen A.K.Li G.M.Li A.Q.zhang E.y.Ji K.Bando y.Tomoe X.P.Guo Dept of Chemistry Huazhong Univ. of Science and Technology zhengzhou Institute of Light Industry

Wettability of a metal surface has been recognized as an important factor in corrosion. The surface-active compounds such as nitrogen or sulfur-containing compounds in crude oils have different effects on wettability. In this work, 6 crude oil samples(including one condensate sample) collected from Chinese and Japanese oil fields were analyzed using SARA analysis, chemiluminescence analysis, X-ray fluorescence analysis, gas chromatography and mass spectrometry. The corrosion behavior of carbon steel in CO-saturated 1% Na Cl solution with the crude oils was studied by weight loss, dynamic potential polarization and electrochemical impedance spectroscopy at 40℃. Furthermore, wettability of carbon steel and oil-filmed carbon steel with and without corrosion products was investigated by measuring the contact angles. The contact angle depended on the type of surfaces(with and without corrosion products) and some specific components of crude oils. The corrosion rate and the contact angle in the tested condition showed negative correlation(significant at 10% level). The correlation coefficient between corrosion rate and each factor of nitrogen, sulfur, aromatic compounds in crude oils showed negative value. The content of oxygen-containing compounds(such as alcohols, ketones, ethers, esters) in the adsorbates of the crude oils on carbon steel increased remarkably after corrosion test for 3 days, and showed negative correlation to the corrosion rate. In addition, the corrosion rate and the hydrocarbon halide in the crude oils showed strong negative correlation. These results indicated that the N, O, S-containing compounds and the hydrocarbon halide compounds in crude oils acted as corrosion inhibitors for carbon steel in the CO-saturated Na Cl solution.

关键词： Crude oils Wettability Corrosion Carbon steel Correlation

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

国际医学放射学杂志 2023年第4期 493-494页

作者： J.Liu J.D.chen P.Li J.W.Liao J.X.Feng z.y.chen 王玉婷

摘要目的为了全面评估腰椎骨质疏松，提出了一种成分分析MR成像技术，通过MRI的3D-短重复时间绝热反转恢复准备脉冲（STAIR）-超短回波时间（UTE）序列和非对称

关键词：

非小细胞肺癌新辅助免疫治疗联合化疗的疗效评价：PET/CT与术后病理结果对照

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2023年第6期 750-750页

作者： y.cheng z.y.chen J.J.Huang D.Shao 齐晓莹

摘要目的评估PET/CT在新辅助免疫治疗联合化疗疗效评估中的价值，并分析其与术后病理的相关性。方法回顾性分析67例可切除的Ⅱ/ⅢA期非小细胞肺癌（NSCLC）病

关键词：