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双叶幕层棚架栽培对“SN2016”猕猴桃性状的影响

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中国南方果树 2024年第3期53卷 247-250页

作者：舒秀写李建华田太原贵州省施秉县农业农村局农村经济经营与农业信息服务站贵州施秉556299 贵州省施秉县农业农村局经济作物技术推广站贵州施秉556299 贵州省施秉县科技服务中心贵州施秉556299

以“SN2016”猕猴桃为试材,比较双叶幕层棚架(在平顶棚架上建斜面牵引层)和平顶棚架猕猴桃主要性状表现。结果发现,双叶幕层棚架猕猴桃主要生长特性及经济性状如萌芽率、结果枝率、平均单果质量、可溶性固形物及产量均高于平顶棚架;营... 详细信息

以“SN2016”猕猴桃为试材,比较双叶幕层棚架(在平顶棚架上建斜面牵引层)和平顶棚架猕猴桃主要性状表现。结果发现,双叶幕层棚架猕猴桃主要生长特性及经济性状如萌芽率、结果枝率、平均单果质量、可溶性固形物及产量均高于平顶棚架;营养枝二次梢和三次梢萌发率均低于平顶棚架。双叶幕层棚架作为猕猴桃优选栽培架式,在生产中有推广应用价值。

关键词：猕猴桃双叶幕层棚架平顶棚架架式

维普期刊数据库博看期刊

Banded Microstructure Formation and Its Effect on the Performance of 06Ni9 Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 325-330页

作者： LIU Dong-feng 1,2,WANG Zheng-guo 1,WEI Ying-hui 1,CUI Tian-xie 2,PAN Qi-fa 2,HOU Li-feng 1 (1.School of Material Science and Engineering,taiyuan University of Technology,taiyuan 03.02.,Shanxi,china 2.Technical Center,taiyuan Iron and Steel Group Co ltd,taiyuan 03.02.,Shanxi,china) taiyuan Univ Technol Sch Mat Sci & Engn Taiyuan 030024 Shanxi Peoples R China taiyuan Iron & Steel Grp Co Ltd Ctr Tech Taiyuan 030024 Shanxi Peoples R China

Focusing on the banded microstructure formed during the production of 06Ni9 steels for cryo-LNG,this paper examines its formation,distribution of alloying elements,structure,hardness,and low-temperature *** results show that the banded microstructure formed after hot-rolling and cooling of the steel binct in which the element segregation occurred during *** phase change during heat treatment also can cause the formation of the banded microstructure of 06Ni9 *** white bands are mainly composed of ferrite and reversed austenite,and the black bands are mainly composed of reversed austenite and a certain amount of *** segregation and formation of more carbide caused some black regions to *** refinement of 06Ni9steel is beneficial to the formation of reversed austenite,the redistribution of alloying elements,improving the stability of austenite and the low-temperature toughness of *** steel easily undergoes nickel segregation;thus,undergoing a secondary quenching and tempering process is *** refinement of martensite quenching above A c3,the martensite that is rich in nickel and carbon,residual austenite and a few little of ferrite after secondary quenching lower than A c3 are beneficial to the formation of high stability ***,this can meet the strength and toughness requirement of the low temperature 06Ni9 steel.

关键词： 06Ni9 steel banded microstructure reversed austenite

Material Flow in Jaw Crusher

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武汉理工大学学报 2006年第S2期28卷 474-478页

作者： CAO Jinxi RONG Xingfu YANG Shichun College of Mechanical Engineering,taiyuan University of Technology,taiyuan 03.02.,china College of Mechanical Engineering Taiyuan University of TechnologyTaiyuan 030024China

Jaw crusher is a kind of machine widely used in mining and aggregates industry,but it still has some shortcom- ings,such as liners wear,terrible power draw *** lack of research on material flow strongly limits the design improvement. The size reduction of the jaw crusher relies on the moving jaw movement that is a kind of complicated *** on the move- ment analysis of the moving jaw and the single particle breakage characters,the material flow is *** measure of the breakage force is carried *** flow analysis is partly confirmed by the experimental results and some new information is also learned from the crushing force *** job on the material flow will be helpful to the jaw crusher design improve- ment.

关键词： single toggle jaw crusher size reduction material flow breakage distribution

Numerical and experimental investigation of the fracture behavior of shock loaded alumina

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Science china(Physics,Mechanics & Astronomy) 2010年第2期53卷 244-252页

作者： REN HuiLan1,SHU XueFeng2 & LI Ping3 1 State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,china 2 Institute of Applied Mechanics and Biomedical Engineering,taiyuan University of Technology,taiyuan 03.02.,china 3 Labroratory for Shock Wave and Detonation Physics Research,Institute of Fluid Physics,CAEP,Mianyang 610059,china 1. State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China2. Institute of Applied Mechanics and Biomedical Engineering Taiyuan University of Technology Taiyuan 030024 China3. Labroratory for Shock Wave and Detonation Physics Research Institute of Fluid Physics CAEP Mianyang 610059 China

Plate impact expeiments are conducted to investigate the dynamic behavior of alumina by using one stage light gas gun. A ve-locity interferometer system for reflectors (VISAR) is used to obtain Hugoniot elastic limit and the free surface velocity profile,which consists of an elastic wave followed immediately by a dispersive inelastic wave. The stress histories under different impact velocities are measured by in-material manganin gauges. Based on the experimental data a Hugoniot curve is fitted,which shows the compressive characteristics that alumina changes typically from elastic to "plastic" ,and under higher pressure it will be transferred to similar-fluid state. The turning point of the Hugoniot curve from a high pressure region to a low pressure region is about 11.4 GPa. The fracture process of alumina is simulated by way of finite element code. After the analysis of the fracture mechanism,the numerical results show an important role played by the nucleation and the growth of the cracks in the macro-scopic fracture of the alumina target. The numerical predictions of stress histories are compared with the experimental results,which indicates consistency between them.

关键词： plate impact experiment hugoniot curve fracture characteristics numerical simulation

Study on Characteristics and Generation Mechanism of YAG Pulsed Laser Welding Cracks of AZ31B Magnesium Alloy

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稀有金属材料与工程 2011年第S4期40卷 21-25页

作者： Cui Zeqin1,2,Wang Wenxian1,2,Si En1,Xu Bingshe1,21Key Laboratory of Interface Science and Engineering in Advanced Materials (taiyuan University of Technology),Ministry of Education,Tai-yuan 03.02.,china2College of Materials Science and Engineering,taiyuan University of Technology,taiyuan 03.02.,china taiyuan Univ Technol Coll Mat Sci & Engn Taiyuan 030024 Peoples R China taiyuan Univ Technol Key Lab Interface Sci & Engn Adv Mat Minist Educ Taiyuan 030024 Peoples R China

Due to poor metallurgical weldability of magnesium alloy,laser welding crack is still one of the main *** generations of welding crack seriously affected the weld quality and reduce the mechanical properties of welded joints which have become a bottleneck of the magnesium alloy products widely used in the structure *** this paper,AZ31B magnesium alloy sheet with 2mm thickness was used for this *** forming reason and extending characteristics of the welding cracks were investigated during the Nd:YAG pulsed laser *** results show that welding cracks are mainly solidification crack which were always present in the weld *** welding hot cracks appear multiple furcation phenomenons,and main and branch cracks were intercrystalline *** partial branch crack was mixed intercrystalline and transgranular *** addition,few cracks in the weld were caused due to irregular shape porosity and *** delayed crack weren't observed in the weld after deposited 48 *** the pre-process on the basis,the characteristics and generation mechanism of YAG pulsed laser welding cracks of magnesium alloy were analyzed further.

关键词： AZ31B magnesium alloy Nd:YAG pulsed laser laser welding welding crack crack extension

Simulation on Mechanical Behaviors of Oil-film Bearing Sleeve by Elastic Interference Fit

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武汉理工大学学报 2006年第S1期28卷 173-176页

作者： HUANG Qingxue1,WANG Jianmei 1,2 ,ZHAO Chunjiang1,MA Lifeng2 (1.taiyuan University of Science and Technology,taiyuan 03.02.,china 2.taiyuan University of Technology,taiyuan 03.02.,china) taiyuan University of Science and Technology Taiyuan 030024China taiyuan University of Science and Technology Taiyuan 030024China taiyuan University of Technology Taiyuan 030024China taiyuan University of Technology Taiyuan 030024China

Oil film bearing,which works on thin film between sleeve and bush,is widely used in steel industry due to the characteristics of high efficiency and low noise,etc. The backup roll of 1 580PC hot strip mill invested by some steel corporation has been equipped with such bearing. During the process of setup&disassembly and usage period,the sleeve has been dramatically damaged,which results in production accidents and decreases its service life,thus heavily influencing steel production. Aimed at such puzzles,under specific loadcase,mechanical properties of bearing sleeve,as well as estimation of contact status and adhesive force of sleeve by interference fit,are quantitatively simulated by finite element method,which establishes an mechanical foundation for improving the load capacity of bearing and decreasing its wear and adhesion damages. Finally,some measures and conclusions are drawn.

关键词： oil-film bearing sleeve interference fit wear and adhesion damages

ON THE EXISTENCE OF POSITIVESOLUTIONS OF AN ELLIPTICBOUNDARY VALUE PROBLEMON THE EXISTENCE OF POSITIVESOLUTIONS OF AN ELLIPTICBOUNDARY VALUE PROBLEM

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Chinese Annals of Mathematics,Series B 2000年第4期21卷 499-510页

作者： LIUZHAOLI LIFUYI DepartmentofMathematics ShandongUniversityJinan250100China. DepartmentofMathematics ShanxiUniversityTaiyuan030006China.

Using variational method, the authors get an existence result for positive solutions of a superlinear elliptic boundary value problem without assuming the P.S. condition. To prove the results in this paper, the author... 详细信息

关键词： Superlinear elliptic BVP Positive solution Variational method Gradient flow

机器人直肠癌经自然腔道取标本手术方式的选择策略

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中华消化外科杂志 2024年第6期23卷 801-805页

作者：叶善平邹睿祥胡文俊肖锋李太原南昌大学第一附属医院普通外科南昌330006

机器人手术因其操作灵活且安全可行的特点逐步应用于胃肠外科领域,尤其是在盆腔狭小空间进行直肠癌根治手术具有明显优势.经自然腔道取标本手术(NOSES)是近年来胃肠外科发展较快的热点手术方式.机器人手术与NOSES技术相互交融将直肠癌... 详细信息

机器人手术因其操作灵活且安全可行的特点逐步应用于胃肠外科领域,尤其是在盆腔狭小空间进行直肠癌根治手术具有明显优势.经自然腔道取标本手术(NOSES)是近年来胃肠外科发展较快的热点手术方式.机器人手术与NOSES技术相互交融将直肠癌微创手术推到新高度.机器人直肠癌NOSES视取出途径不同分为经直肠肛门和经阴道取标本手术.手术方式的选择策略是机器人直肠癌NOSES规范、健康、有序开展的关键.笔者查阅国内外相关文献以及指南,结合团队实践经验,阐述机器人直肠癌NOSES方式的选择策略,旨在为更加科学、安全地开展机器人直肠癌NOSES提供参考.

关键词：直肠肿瘤机器人手术系统经自然腔道取标本手术手术方式疗效安全性

Technology of Arc-added Glow-discharge Brazing and Brazing of Ceramic to Metal

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厦门大学学报(自然科学版) 2002年第S1期 83-84页

作者： WANG Wen-xian, ZHANG Yong-qing, ZHAO Peng-sheng (College of Material Science and Engineering, taiyuan University of Technology, taiyuan 03.02., china)

A new brazing method, arc-added glow-discharge br az ing (AGB), was studied in respects of mechanism, technology, application and equ ipment in which the workpiece is directly heated by both ion bombardment of glow discharge and radiation heat of arc discharge. The AGB equipment was manufactured by taiyuan University of Technology and i t mainly consists of: (1) brazing furnace; (2) vacuum system; (3) power closet; (4) measuring and control system. The heating cycle of brazing was composed of heating speed, brazing temperatu re, heat-shielding time, and cooling speed and determined by brazing parameter such as limit degree of vacuum (Va), work pressure (P), glow voltage ( V), arc current (I), P-V match and brazing time (t). The effect o f brazing parameter on the quality of brazing joints was analyzed and discussed. The heating cycle of brazing was designed according to the material and structu re of the workpiece and the result of their optimization were controlled by a FX 2 industrial PC computer. Many metals or alien metals can be brazed by means of AGB method like steel, cop per, aluminum and stainless steel. However, the dominance of AGB is that non-me tals such as ceramic are brazed in AGB method. In the process of AGB, it is possible to deposit active active metallic elements on ceramic surface by glow discharge metallizing with arc source in which the s pattering deposition goes on with a high speed and can occur at a comparatively low temperature. Si 3N 4 ceramics have been put to test by using the above pro cess. Take the T-shaped joint brazing of Si 3N 4 to 45 # steel as an example (Si 3N 4 is of 13×13×7 mm in vertical position and 45 # steel is 1 mm thic k in horizontal position). After brazing, the compositions at different position s of the brazing fillet have been examined by EDX. EPMA analysis showed the exis tence of TiN on ceramic surface, which was produced by the following reaction: S i 3N 4+4Ti = 4TiN+3Si. TiN is a compound similar to metal, whi

关键词： brazing arc-added glow-discharge brazing tech nology ceramic