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Materials Sciences and Applications 2013年第7期4卷 23-28页

作者： Osamu Takakuwa Amrinder S. Gill Gokul Ramakrishnan Seetha R. Mannava Vijay K. vasudevan Hitoshi Soyama Department of Nanomechanics Tohoku University Sendai Japan School of Dynamic Systems University of Cincinnati Cincinnati USA

The introduction of compressive residual stress is an effective way to reduce fretting fatigue and fretting wear between a spinal implant rod and its holding fixture. The objective of this paper is to demonstrate that cavitation peening can introduce compressive residual stress into the surface of a spinal implant rod manufactured from medical grade titanium alloy Ti-6Al-4V, which has already been processed by glass shot peening. In order to apply the cavitation peening for the small rod, whose diameter is only 5.5 mm, the cavitating region was concentrated by increasing the ambient pressure. The depth profiles of the resulting residual stress were evaluated by X-ray diffraction following layer removal by electropolishing. The results show that cavitation peening creates compressive residual stress deeper into the rod, even though the stress value at the near surface is saturated due to initial processing using glass shot peening. The depth of the compressive residual stress continuously increases from 44 μm to 230 μm with an increase in the cavitation peening processing time. In addition, the full width at half maximum value of the X-ray diffraction profile, which is closely related to the micro-strain, decreases by up to 32% following the application of cavitation peening.

关键词： Compressive Residual Stress Fretting Titanium Alloy Cavitation Peening Spinal Implant Rod

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Al-Li合金的环状裂纹问题

轻合金加工技术 1987年第5期 24-27页

作者： A·K·vasudevan 丁树智

Al-Li合金是过去几年内研究较多的课题。因为它在宇航工程中具有很大应用潜力的缘故。它主要是根据铝合金中加入锂使其弹性模量增大和比重减轻而确定的。Sanders及其同事们对采用峰值时效(T651)的2020铝合金(Al-4.5Cu-1.1Li-0.52Mn-0.2... 详细信息

Al-Li合金是过去几年内研究较多的课题。因为它在宇航工程中具有很大应用潜力的缘故。它主要是根据铝合金中加入锂使其弹性模量增大和比重减轻而确定的。Sanders及其同事们对采用峰值时效(T651)的2020铝合金(Al-4.5Cu-1.1Li-0.52Mn-0.2Cd)的疲劳裂纹增长抗力进行了早期研究。他们发现,该合

关键词：疲劳裂纹弹性模量弹性系数 Al-Li Li 临界应力强度裂纹分布环状

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不同成因磷灰石可浮性的研究

武汉工程大学学报 1991年第3期25卷 33-44页

作者：钟康年 T.V.vasudevan P.Somasundaran 武汉化工学院 Columbia

对五种不同成因磷灰石的浮选行为与表面,溶解速度,油酸钙沉淀和油酸盐吸附量等之间的关系作了系统研究。实验表明,磷灰石的溶解速度,油酸钙沉淀量及充分浮选所需油酸钾浓度都与磷灰石的比表面积有关。沉积型磷灰石有较大比表面积,在水... 详细信息

对五种不同成因磷灰石的浮选行为与表面,溶解速度,油酸钙沉淀和油酸盐吸附量等之间的关系作了系统研究。实验表明,磷灰石的溶解速度,油酸钙沉淀量及充分浮选所需油酸钾浓度都与磷灰石的比表面积有关。沉积型磷灰石有较大比表面积,在水溶液中溶下较多量ca^(2+)离子,生成较多油酸钙沉淀,充分浮选时需较高油酸钾浓度。充分浮选时,捕收剂在五种不同磷灰石表面的复盖率看来是相近的,都有油酸钙沉淀生成,这与ca^(2+)离子从磷灰石表面溶下速度及达到一定复盖率时所需的捕收剂浓度有关。

关键词：成因磷灰石可浮性

Mediastinal Liposarcoma: Case Report and Literature Review

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Journal of Cancer Therapy 2021年第4期12卷 208-220页

作者： Jeronimo Garcialopez De Llano Maria Fernanda Mijares Vanitha vasudevan Rodrigo Arrangoiz Amit Sastry Frank De la Cruz Jennifer Fernandez Garcia Adrian Legaspi Center for Advanced Surgical Oncology Palmetto General Hospital Hialeah USA

Liposarcomas (LS) are the second most common type of soft tissue malignancies in adults;they arise from mesenchymal cells and account for 1% of all adult cancers and 15% of all pediatric cancers. The site of origin can be from anywhere there is fat in the human body. LS are classified based on the primary site of origin, and mediastinal LS are extremely rare. When mediastinal neoplasms are stratified based on histology, they represent less than 1% of all mediastinal tumors. To date, less than 150 cases have been reported in the English literature. This article aims to present an unusual case of an extremely rare malignancy and perform a systematic review of the latest literature. In this report, our group is documenting the presentation, management, and outcome of a 65-year-old male patient with a massive anterior mediastinal primary LS. The tumor was displacing the mediastinum into the right chest, occupying most of the left chest, and pushing the diaphragm into the abdomen. Mediastinal liposarcomas are extremely rare malignancies and can prove to be challenging to diagnose and treat. Aggressive surgical treatment with R0 resection is the gold standard, however, tumor biology in many cases is associated with variable growth rates and encroachment of adjacent vital structures and blood vessels. When complex anatomical structures preclude an R0 resection, there is a high incidence of local recurrence. In cases where there is a high risk of recurrence, radiotherapy is indicated and chemotherapy has a more limited role.

关键词： Liposarcoma (LS) Well-Differentiated Liposarcoma (WDLS) Dedifferentiated Liposarcoma (DDLS)

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用反一正一反流程选别佛罗里达白云质磷块岩

武汉工程大学学报 1989年第S1期23卷 47-53页

作者：钟康年 T.V.vasudevan P.SOmasundaran

美国佛罗里达白云质磷块岩经搅拌脱泥后采反一正一反三段浮选流程,可从含P_2o_59.9%,MgO1．9%的擦洗脱泥精矿中排除89%MeO得到含P_2O_(5)0．9%,Mgo0．9%,的高质精矿,回收率70．9%。与Ca、Mg离子不生成沉淀的新型表面活性剂环乙氧基磺酸... 详细信息

美国佛罗里达白云质磷块岩经搅拌脱泥后采反一正一反三段浮选流程,可从含P_2o_59.9%,MgO1．9%的擦洗脱泥精矿中排除89%MeO得到含P_2O_(5)0．9%,Mgo0．9%,的高质精矿,回收率70．9%。与Ca、Mg离子不生成沉淀的新型表面活性剂环乙氧基磺酸盐(EO．S. )与油酸和矿物油用作捕收剂,磷酸衍生物(Dequest2010)用怍磷矿物抑制剂,在PH=5．5介质中反浮选排除白云石。第一段反浮选可排除59%MgO．主要是细粒白云石,第三段反浮选进一步排除19%MgO,主要为粗粒白云石。第二段正浮选在中性介质中排除98%石英和11%白云石。本流程的优点是矿浆不需加温,反浮选矿浆PH值较高,药剂制度简单,药耗较低,可得优质精矿。

关键词：选别反浮选白云质浮选流程药剂制度脱泥捕收剂新型表面活性剂正浮选磷块岩

Copy number variations are progressively associated with the pathogenesis of colorectal cancer in ulcerative colitis

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World Journal of Gastroenterology 2015年第2期21卷 616-622页

作者： Bhadravathi Marigowda Shivakumar Harish Rotti Thanvanthri Gururajan vasudevan Aswath Balakrishnan Sanjiban Chakrabarty Ganesh Bhat Lakshmi Rao Cannanore Ganesh Pai Kapaettu Satyamoorthy Department of Gastroenterology and Hepatology Kasturba Medical CollegeManipal UniversityManipal 576104India School of Life Sciences Manipal UniversityManipal 576104India Department of Pathology Kasturba Medical CollegeManipal UniversityManipal 576104India

AIM: To evaluate the association of known copy number variations(CNVs) in ulcerative colitis(UC) progressing to colorectal ***: Microsatellite instability analysis using the National Cancer Institute's panel of markers, and CNV association studies using Agilent 2 × 105 k arrays were done in tissue samples from four patient groups with UC: those at low risk(LR) or high risk of developing colorectal cancer, those with premalignant dysplastic lesions, and those with colitis-associated colorectal cancer(CAC). DNA from tissue samples of these groups were independently hybridized on arrays and analyzed. The data obtained were further subjected to downstream bioinformatics enrichment analysis to examine the correlation with CAC ***: Microarray analysis highlighted a progressive increase in the total number of CNVs [LR(n = 178) vs CAC(n = 958), 5.3-fold], gains and losses [LR(n = 37 and 141) vs CAC(n = 495 and 463), 13.4- and 3.3-fold, respectively], size [LR(964.2 kb) vs CAC(10540 kb), 10.9-fold] and the number of genes in such regions [LR(n = 119) vs CAC(n = 455), 3.8-fold]. Chromosomewise analysis of CNVs also showed an increase in the number of CNVs across each chromosome. There were 38 genes common to all four groups in the study; 13 of these were common to cancer genes from the Genetic Disease Association dataset. The gene set enrichment analysis and ontology analysis highlighted many cancerassociated genes. All the samples in the different groupswere microsatellite ***: Increasing numbers of CNVs are associated with the progression of UC to CAC, and warrant further detailed exploration.

关键词： Ulcerative colitis Colorectal cancer Molecularanal

A Foreword from the Editor-in-Chief

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Semiconductor Science and Information Devices 2019年第1期1卷 1-1页

作者： Kasturi vasudevan Indian Institute of Technology Kanpur India

Welcome to the inaugral issue of Semiconductor Science and Information *** is expected that future telecommunication networks(5G and beyond)will host not only humans but also machines in the form of Internet of Things(IoT).Therefore,there is a growing demand for increased data rates,of the order of tens of gigabits per second for each device for streaming 8K video,latencies of less than one millisecond for autonomous driving and remote surgeries,increased device density over a square kilometer,millimeter wave frequencies(carrier frequencies in excess of 100 gigahertz)and last but not the least,having a large number of antennas on each device,in the form of massive multiple input and multiple output(MIMO)for the purpose of spatial multiplexing and increased data-rates.

关键词： millimeter IoT beyond

Confluence of Encryption,Absorption and Sensation-Well Almost Nearly

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Semiconductor Science and Information Devices 2021年第2期3卷 27-28页

作者： K vasudevan IIT KanpurIndia

In this issue,manuscripts have been published on a wide variety of topics,which demonstrates the large scope of Semiconductor Science&Information *** the authors are from diverse geographical areas!We continue to encourage such submissions on varied *** fact,much of the engineering today is multi-disciplinary involving close cooperation&collaboration among many fields&specializations.

关键词： Specific Absorption Rate(SAR) Electromagnetic wave Mobile base station Public health safety RF waves