检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

压铸工艺参数对铝合金汽缸体孔隙率的影响

特种铸造及有色合金 2009年第1期29卷 36-38页

作者：赵鑫曾小勤陈彬丁文江上海交通大学轻合金精密成型国家工程研究中心上海交通大学金属基复合材料国家重点实验室

通过测量铸件热处理前后密度变化率,系统研究了压铸过程中浇注温度、铸造压力、快压射速度、快压射切换位置等工艺参数对铝合金汽车空调压缩机汽缸体孔隙率的影响规律。结果表明,铸件内的孔隙率随着浇注温度的升高和快压射速度的增加而... 详细信息

通过测量铸件热处理前后密度变化率,系统研究了压铸过程中浇注温度、铸造压力、快压射速度、快压射切换位置等工艺参数对铝合金汽车空调压缩机汽缸体孔隙率的影响规律。结果表明,铸件内的孔隙率随着浇注温度的升高和快压射速度的增加而增大,随着快压射切换位置的增加而减小,随着铸造压力的增加先增大后变小。综合考虑,浇注温度为700～720℃,铸造压力为104MPa,压射速度为1.5m/s,快压射位置为320mm时,铸件孔隙率最小,性能最好。

关键词：压铸工艺参数 R14铝合金汽缸体密度变化率孔隙率

Quantitative Remote Sensing in Crop Biochemical Parameters Inversion and Stripe Rust Monitoring

在线全文

学校读者我要写书评

暂无评论

Quantitative Remote Sensing in Crop Biochemical Parameters I...

Medical Additive Manufacturing: From a Frontier Technology to the Research and Development of Products

2005北京都市农业工程科技创新与发展国际学术研讨会

作者： Huang wenjiang Liu Liangyun Wang Jihua zhao Chunjiang (National Engineering Research Center for Information Technology in Agriculture)

＜正＞Remote sensing offers the potential to determine rapidly the physiological condition of crop over large areas. Spectral reflectance measurements at leaf and canopy scales in the field provide a promising, quick and nondestructive way to take information in relatively wide area in a short time. Canopy reflectance data selected at key growth stages of winter wheat were analyzed. It indicated that winter wheat growth phonological changes can be e-valuated by Red Edge Variables （REV） characteristics. Regression equations between foliar chlorophyll concentration, nitrogen concentration, soluble sugar etc. and REV were established, prediction of foliar soluble sugar and chlorophyll concentration by red edge position, foliar nitrogen concentration by the amplitude of red edge, starch concentration by the near infrared plateau, leaf area index by the area of red edge peak are successful feasible. Wheat yellow rust is also called as stripe rust, it caused the primary yield loss of China’s wheat production industry. The traditional method of field survey for wheat yellow rust disease indices （DI） is time consuming. This study was to develop the appropriate spectral indices from in situ reflected spectrum and hyperspectral images for extraction DI of yellow rust and use this information to predict the onset of this disease in wheat in a timely and less labor intensive manner. When wheat was infected by yellow rust, The Photochemical Reflectance Index （PRI） was chosen for DI inversion. There is linear negative relation between the normalized photochemical reflectance index （NPRI） extracted from in situ canopy reflected spectrum and DI with a coefficient of determination R2 =0. 9417 （n = 87） by the data in 2002, and the DI value between investigated and simulated data in 2003 with a coefficient of determination R2 =0. 9477 （n=117）, so the Normalized Photochemical Reflectance Index （NPRI） can be used to inverse DI. This paper also suggested the possibility of developing a spec

关键词： Winter Wheat Crop biochemical parameters Yellow Rust Canopy Reflected Spectrum

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

Engineering 2020年第11期6卷 1217-1221页

作者： Guixing Qiu wenjiang Ding Wei Tian Ling Qin Yu zhao Lianmeng Zhang Jian Lu Daijie Chen Guangyi Yuan Chengtie Wu Bingheng Lu Ruxu Du Jimin Chen Mo Elbestawi Zhongwei Gu Dichen Li Wei Sun Yuanjin zhao Jie He Dadi Jin Bin Liu Kai Zhang Jianmo Li Kam WLeong Dewei zhao Dingjun Hao Yingfang Ao Xuliang Deng Huilin Yang ShaoKeh Hsu Yingqi Chen Long Li Jianping Fan Guohui Nie Yun Chen Hui Zeng Wei Chen Yuxiao Lai Department of Orthopedics Peking Union Medical College HospitalChinese Academy of Medical Science 8 Peking Union Medical CollegeBejjing 100730.China National Engineering Research Center of Light Alloys Net Forming&State Key Laboratony of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China Notional Engineering Research Center of Mg Materials and Applicarions and School of Materials Science 8r Engineering.Shanghai Jlao Tong University Shanghai 200240China Department of Spine Surgery Beijing Jishuitan HospitalBeijing 100035China Center for Troanslational Medicine Research and Development Institute of Biomedical and Health EngineeringShenzhen Insitute of Advanced Technology.Chinese Academy of SciencesShenzhen 518055China Guangdong Engineering Laboratony of Biomaterials Additive Manufacturing Guangdong 518055China Musculoskeletal Research Laboratory of the Department of Orthopedics 8 Traumatology and Innovative Orthopedic Biomaterial and Drug Translational Research Laboratory Li Ka Shing Institute of Health SciencesThe Chinese University of Hong KongHong Kong 999077.China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Center for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstiuteShenzhen 518057.China Hong Kong Branch of National Precious Metals Material Engineering Research Center Department of Material Science and EngineeringCity Untiversity of Hong KongHong Kong 999077.China Department of Mechanical Engineering ity Untiversity of Hong Kong.Hong Kong 9977 China School of Pharmacy.Shanghai Jiao Tong University Shanghai 200240China China State Instute of Pharmaceutical Industry Shanghai Institute of Pharmaceutical IndustryShonghai 201203China Shanghai Innovation Instinute for Materials Shanghai 200444.China State Key Laboratory of High-Performance Ceramies and Superfine Microstructure Shanghai Institute of CeramicsChinese Acadermy 0f SciencesShanghai 200050Ch

*** and development(R&D)and the challenges of raw materials for medical additive manufacturing Raw materials for medical additive manufacturing have a wide range of commonalities that are also seen in many other fields,making them an important basis in the field of three-dimensional(3D)*** and challenges related to material types,powder properties,formability,viscoelasticity,and so forth also share common *** example,many metal materials are used in the field of aviation,while metals,polymers,and inorganic materials are used in the field of *** most widely used materials in biomedicine are *** homogeneous and non-homogeneous composites are also available for 3D printing,and impose an additional challenge in additive manufacturing;the use of heterogeneous composites in 3D printing is particularly challenging.

关键词： composites printing additive

Mg-Gd-Ag-Zr合金的组织与力学性能

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

特种铸造及有色合金 2009年第5期29卷 477-479页

作者：赵政王渠东丁文江上海交通大学轻合金精密成型国家工程研究中心上海交通大学金属基复合材料国家重点实验室

对Mg-18.6Gd-1.9Ag-0.24Zr合金铸态、T4态和T6态的显微组织和力学性能进行了研究。结果表明,该合金铸态时由α-Mg与分布在晶界的Mg5Gd相组成;T4态时由过饱和α-Mg固溶体和H2Gd相组成;峰值时效态的析出相为β′相。该合金具有明显的时效... 详细信息

对Mg-18.6Gd-1.9Ag-0.24Zr合金铸态、T4态和T6态的显微组织和力学性能进行了研究。结果表明,该合金铸态时由α-Mg与分布在晶界的Mg5Gd相组成;T4态时由过饱和α-Mg固溶体和H2Gd相组成;峰值时效态的析出相为β′相。该合金具有明显的时效强化效果,在200、225、250℃温度下的时效处理结果发现,随着时效温度的升高,合金的峰值时效硬度下降,到达峰值硬度的时间大为缩短。其中200℃下的峰值时效硬度(HV)最高,达到了134。合金经过200℃的峰值时效处理后具有最高的室温力学性能,屈服强度、抗拉强度和伸长率分别为291.0MPa、383.5MPa和1.17%。

关键词： Mg—Gd-Ag—Zr合金合金元素显微组织力学性能

基于HD61202U图形液晶模块接口电路及编程

在线全文

学校读者我要写书评

暂无评论

微计算机信息 2006年第1Z期22卷 131-132,101页

作者：张岩赵乃卓李文江山东工商学院信息与电子工程学院辽宁工程技术大学电气工程系

从实际应用的角度出发介绍了内置HD61202图形液晶显示模块的结构特性,液晶显示模块的硬件接口电路及编程要点,并对其正常工作的条件、控制指令系统及编程思路进行了探讨。

关键词：图形液晶显示模块 HD61202控制器接口电路间接控制

在线全文

学校读者我要写书评

暂无评论

镁合金抗高温氧化机理研究进展

金属学报 2023年第3期59卷 371-386页

作者：沈朝王志鹏胡波李德江曾小勤丁文江上海交通大学材料科学与工程学院轻合金精密成型国家工程研究中心上海200240

本文简要回顾了国内外镁合金抗高温氧化机理的研究进展,归纳总结了纯Mg的高温氧化机理和镁合金高温氧化热力学与动力学及抗氧化机理,并探讨了先进表征技术在镁合金高温氧化研究中的潜在应用前景,最后展望了耐高温氧化镁合金的发展方向... 详细信息

本文简要回顾了国内外镁合金抗高温氧化机理的研究进展,归纳总结了纯Mg的高温氧化机理和镁合金高温氧化热力学与动力学及抗氧化机理,并探讨了先进表征技术在镁合金高温氧化研究中的潜在应用前景,最后展望了耐高温氧化镁合金的发展方向。主要观点如下:镁合金主要是通过形成具有一定厚度、连续且致密的氧化膜来抑制Mg蒸气向外扩散和O的内渗透;镁合金的高温氧化通常与第二相的热稳定性有密切关系;当微量合金元素不足以在表面生成相应氧化物时,可通过形成置换固溶体和反应性元素效应来提高保护作用;具有表面活性的元素会在合金表面富集并减小氧化物尺寸,从而增强氧化层;合金元素的选择性氧化与协同作用对镁合金的抗氧化性能至关重要;在镁合金中加入纳米或微型颗粒可通过减少特定的氧化区域来提高镁合金的高温抗氧化性。未来关于耐高温氧化镁合金的研究可基于以下方面继续深入:应用先进表征技术精准揭示镁合金抗氧化的机理和本质;建立合金元素与氧化膜晶粒尺寸和力学性能的内在关联;设计合理的多合金元素成分体系。

关键词：镁合金高温氧化抗氧化机理氧化膜先进表征技术

Social Network Analysis Based on Analysis of The Food Blog

在线全文

学校读者我要写书评

暂无评论

Social Network Analysis Based on Analysis of The Food Blog

2010 International Conference on Future Information Technology and Computing (FITC 2010)

作者： Yongbing Gao Yang Cui wenjiang Hu Guangli zhao(School of Information Engineering Inner Mongolia University of Science & Technology) Baotou Inner Mongolia China

Blog is a new social network *** has brought a new revolution to the Internet communication,and has aroused more and more *** have been some very influential Blog *** portal sites also opened a Blog *** sites are composed of the recommended date of Home *** recommended method should be able to encourage a good Blog to recommend and promote the exchange of competition the recommended date of Home *** this paper,we study the Blog by using social network *** analyze the links and communication of Blog through density,centrality,small-world effect and visual *** recommended method for the Blog has made a useful attempt.

关键词： Blog Social Network Analysis

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

集控中心建设中不停电进行遥控试验的方法

电力系统自动化 2009年第10期33卷 99-103页

作者：赵维俊石文江王荣茂王洪哲大连供电公司电网调度中心辽宁省大连市116011

在不停电情况下正确进行遥控试验是大电网集控中心接入无人值班变电站时必须要解决的核心技术问题之一,通过详细分析主站到常规变电站及数字化变电站的遥控执行过程,给出了解决该问题的实用方法,尤其是保护测控一体化的综合自动化设备... 详细信息

在不停电情况下正确进行遥控试验是大电网集控中心接入无人值班变电站时必须要解决的核心技术问题之一,通过详细分析主站到常规变电站及数字化变电站的遥控执行过程,给出了解决该问题的实用方法,尤其是保护测控一体化的综合自动化设备和数字化变电站的不停电遥控试验问题,其关键在于正确选择遥控试验边界,针对不同边界采取相应客观有效的遥控试验方法。

关键词：集控中心无人值班变电站遥控 IEC 61850 远动协议

在线全文

学校读者我要写书评

暂无评论

钛柱撑蒙脱石颗粒的制备及其对镉离子的吸附

功能材料 2019年第5期50卷 5099-5105页

作者：宋祥庹必阳赵徐霞陈兵兵龙文江贵州大学矿业学院贵阳550025 贵州大学贵州省非金属矿产资源综合利用重点实验室贵阳550025 贵州大学喀斯特地区优势矿产资源高效利用国家地方联合工程实验室贵阳550025

为脱除废水中镉离子,以钠基蒙脱石作基质材料,钛酸四丁酯为钛源,制备了钛柱撑蒙脱石。然后将聚乙烯醇、海藻酸钠、钛柱撑蒙脱石以一定的质量比制备钛柱撑蒙脱石颗粒,并进行颗粒的散失实验及镉离子的吸附实验,同时进行吸附等温线及吸附... 详细信息

为脱除废水中镉离子,以钠基蒙脱石作基质材料,钛酸四丁酯为钛源,制备了钛柱撑蒙脱石。然后将聚乙烯醇、海藻酸钠、钛柱撑蒙脱石以一定的质量比制备钛柱撑蒙脱石颗粒,并进行颗粒的散失实验及镉离子的吸附实验,同时进行吸附等温线及吸附动力学研究。结果表明,Ti-MMT具有较大的晶面间距(d_(001)=3.43 nm)。当m(聚乙烯醇)∶m(海藻酸钠)∶m(钛柱撑蒙脱石)=0.6∶1.0∶20.0时,投加0.25 g颗粒于pH值=6的100 mg/L的镉离子废水中,在40℃下,吸附120 min,颗粒对Cd^(2+)的吸附量达到7.89 mg/g,去除率达到98.63%,且颗粒对Cd^(2+)的吸附符合Langmuir等温线模型,吸附动力学符合拟二级动力学方程。

关键词：钛柱撑蒙脱石颗粒吸附镉离子