检索结果-南通市图书馆

Influence of Sputtering Gas on morphological and Optical Properties of magnesium Films

Journal of materials Science & Technology 2011年第1期27卷 51-58页

作者： Yogendra K.Gautam Amit K.Chawla Vipin Chawla R.D.Agrawal Ramesh chandra Department of metallurgical and materials Engineering Indian Institute of Technology Roorkee Nano Science Laboratory Institute Instrumentation CentreIndian Institute of Technology Roorkee

The influence of sputtering gas（He ar） on the structural properties of mg thin films has been *** optical property（reflectance） that results from the growth of films at varying substrate temperatures（Tsub） was also *** deposited films were characterized by using X-ray diffraction（XRD）,field emission scaning electron microscopy（FE-SEm）,atomic force microscopy（AFm） and UV-Vis-NIR *** smaller crystallite size and lower deposition rate were observed in the presence of Helium atmosphere compared to *** of the films shows 2D hexagonal geometry of grains in the deposition temperature range（Tsub≈50-150℃） in both the sputtering *** surface roughness of the polycrystalline films were found to increase with increase in the deposition temperature of both ambient *** reflectance of mg films was measured in near infrared region and larger reflectance was observed from mg films sputtered in He atmosphere compared to that in argon.

关键词： X-ray diffraction(XRD) Atomic force microscopy(AFm) Reflectance mg films microstructure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

mHD Seismology of a loop-like filament tube by observed kink waves

引用

Research in Astronomy and Astrophysics 2015年第10期15卷 1713-1724页

作者： Vaibhav Pant Abhishek K Srivastava Dipankar Banerjee marcel Goossens Peng-Fei Chen Navin chandra Joshi Yu-Hao Zhou Indian Institute of Astrophysics Department of Physics Indian Institute of Technology(BHU) Center of Excellence in Space Sciences Centre for mathematical Plasma Astrophysics Department of Mathematics School of Astronomy and Space Science Nanjing University Key Lab of modern Astronomy and Astrophysics Nanjing University School of Space Research Kyung Hee University

We report and analyze observational evidence of global kink oscillations in a solar filament as observed in Ha by instruments administered by National Solar Observatory （NSO）/Global Oscillation Network Group （GONG）. An m1.1-class flare in active region （ar） 11692 occurred on 2013 march 15 and induced a global kink mode in the filament lying towards the southwest of ar 11692. We find periods of about 61-67 minutes and damping times of 92-117 minutes at positions of three ver- tical slices chosen in and around the filament apex. We find that the waves are damped. From the observed period of the global kink mode and damping timescale using the theory of resonant absorption, we perform prominence seismology. We estimate a lower cut-off value for the inhomogeneity length scale to be around 0.34-0.44 times the radius of the filament cross-section.

关键词： Sun: oscillations -- Sun: magnetic fields -- Sun: filament

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A comprehensive study of long-term skeletal changes after spinal cord injury in adult rats

引用

Bone Research 2015年第3期3卷 164-172页

作者： Tiao Lin Wei Tong Abhishek chandra Shao-Yun Hsu Haoruo Jia Ji Zhu Wei-Ju Tseng michael A Levine Yejia Zhang Shi-Gui Yan X Sherry Liu Dongming Sun Wise Young Ling Qin Department of Orthopaedic Surgery Perelman School of Medicine University of Pennsylvania Department of musculoskeletal Oncology The First Affiliated Hospital of Sun Yat-sen University Department of Orthopaedics Union Hospital Tongji Medical College Huazhong University of Science and Technology W.m.Keck Center for Collaborative Neuroscience Rutgers The State University of New Jersey Department of Orthopaedic Surgery School of Medicine Shihezi University Division of Endocrinology and Diabetes The Children’s Hospital of Philadelphia and Department of Pediatrics Perelman School of Medicine University of Pennsylvania Department of Physical medicine & Rehabilitation Perelman School of Medicine University of Pennsylvania and Translational Musculoskeletal Research Center Philadelphia Veterans Affairs Medical Center Department of Orthopaedic Surgery 2nd Affiliated Hospital School of Medicine Zhejiang University

Spinal cord injury（SCI）-induced bone loss represents the most severe osteoporosis with no effective *** animal studies have focused primarily on long bones at the acute stage using adolescent rodents. To mimic chronic SCI in human patients, we performed a comprehensive analysis of long-term structural and mechanical changes in axial and appendicular bones in adult rats after SCI. In this experiment, 4-month-old Fischer 344 male rats received a clinically relevant T13 contusion injury. Sixteen weeks later, sublesional femurs, tibiae,and L4 vertebrae, supralesional humeri, and blood were collected from these rats and additional non-surgery rats for micro-computed tomography（m CT）, micro-finite element, histology, and serum biochemical *** trabecular sites, extreme losses of bone structure and mechanical competence were detected in the metaphysis of sublesional long bones after SCI, while the subchondral part of the same bones showed much milder damage. marked reductions in bone mass and strength were also observed in sublesional L4 vertebrae but not in supralesional humeri. At cortical sites, SCI induced structural and strength damage in both sub- and supralesional long bones. These changes were accompanied by diminished osteoblast number and activity and increased osteoclast number and activity. Taken together, our study revealed site-specific effects of SCI on bone and demonstrated sustained inhibition of bone formation and elevation of bone resorption at the chronic stage of SCI.

关键词： SCI bone A comprehensive study of long-term skeletal changes after spinal cord injury in adult rats

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Thermal Behavior and magnetic Properties of Nd-Fe-B Based Exchange Spring Nanocomposites Nd4-xTbxFe83.5Co5Cu0.5Nb1B6(x = 0, 0.2, 0.4, 0.6, 0.8 and 1) melt-Spun Ribbons

引用

Advances in materials Physics and Chemistry 2017年第6期7卷 223-241页

作者： Palash chandra Karmaker mohammad Obaidur Rahman Nguyen Huy Dan Samia Islam Liba Per Nordblad Dilip Kumar Saha Sheikh manjura Hoque materials Science Division Atomic Energy CenterDhakaBangladesh Department of Physics Jahangirnagar UniversityDhakaBangladesh Institute of materials Science Vietnam Academy of Science and TechnologyHanoiVietnam Solid State Physics Department of Engineering ScienceUppsala UniversityUppsalaSweden

Co-rich Nd-Fe-B nanocomposite ribbons with Tb substituted have been fabricated by single roller melt spinning technique of Nd4-xTbxFe83.5Co5Cu0.5Nb1B6 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) alloys in an argon (ar) atmosphere at a circumferential speed of 40 m/s. According to the differential scanning calorimeter (DSC) traces the nanocomposite samples have been annealed at different temperatures like 675°C, 687°C, 700°C, 712°C and 725°C for 10 min. Crystallization behavior was studied by X-ray diffraction in which it was found that the XRD patterns are characterized by broad diffused pattern which demonstrate the amorphous state of materials. The ribbon samples were also characterized by vibration sample magnetometer (VSm) and mössbauer spectroscopy at as-cast and annealed condition. Co-rich and Tb substitution has significantly enhanced the value of coercivity (Hc) and maximum energy product (BH)max. Highest value of Hc and (BH)max has been obtained as 2.36 kOe and 6.11 mGOe for the sample annealed at 700°C for 10 min with higher concentration of Tb. The m-H hysteresis loops show extremely soft natures which do not possess any area. We have found reduced remanent ratio (mr/ms) up to 0.49 at optimal annealing temperature 700°C. However, with the annealing of the samples in the above mentioned temperature, evolution of large coercivity was observed due to the formation of exchange couple hard and soft nanocrystal composites. We have investigated the variation of Curie temperature (Tc) with annealing temperature of the melt spun ribbon samples. mossbauer spectroscopy was carried out to study the hyperfine parameters such as hyperfine field, hyperfine field distribution for full width half maximum (FWHm) and isomer shift of Fe species of these two phases.

关键词： Coercivity maximum Energy Product Remanent Ratio Nanocomposite Hard and Soft Phases

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：