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Clinical-radiological-pathological correlation of cavernous sinus hemangioma: Incremental value of diffusion-weighted imaging

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World Journal of Radiology 2017年第8期9卷 330-338页

作者： Abhishek Mahajan Vedula Rajni Kanth Rao Gudipati Anantaram Ashwin M Polnaya Sandeep Desai paresh Desai Rammohan Vadapalli Manas Panigrahi Department of Radio- diagnosis Tata Memorial Centre Department of Radiology Krishna Institute of Medical Sciences Department of Radiodiagnosis Clumax Imaging Department of Radiology Apollo Victor Hospital Department of Radiology Vijaya Diagnostics Department of Neurosurgery Krishna Institute of Medical Sciences

AIMTo elucidate the clinical, magnetic resonance imaging (MRI), pathological features of these lesions and asses the incremental value of diffusion-weighted imaging (DWI) in diagnosing them. METHODSFifteen consecutive patients (11 females and 4 males; mean age 40.93 years; age range 13-63 years) with cavernous sinus hemangiomas (CSH) who underwent examination between November 2008 and May 2016 were included for the analysis. MRI, clinical and surgical findings of each patient was retrospectively reviewed. DWI were also analysed and mean-apparent diffusion coefficient (ADC) value was calculated. Eleven patients underwent surgical removal of the lesion and 2 patients had biopsy only. Diagnosis of CSH was confirmed histologically in 13 patients. RESULTSEleven patients (73%) presented with headaches and 10 (66%) had cranial nerve involvement. Extra cavernous sinus extension was noted in 14 (94%). Surgery was performed in 13 (87%) and post-operative radiation was given to 4 (28%) patients. Thirteen patients remained asymptomatic on follow up. Three conspicuous imaging features were highly suggestive of the diagnosis: Lack of diffusion restriction (100%), homogeneous hyperintensity on T2 weighted image sequences (93.3%) and intense post-contrast enhancement (100%). The mean ADC was 1.82 × 10-3 ± 0.2186 cm2/s. CONCLUSIONT1-weighted hypointensity with homogeneous hyperintensity on T2-weighted sequences, intense enhancement and absence of hemosiderin within the lesion on GRE sequence favour the diagnosis. Facilitated diffusion on DWI differentiates CSH from other solid cavernous sinus lesions and significantly improves the diagnostic accuracy, a critical factor for planning surgery.

关键词： Cavernous sinus hemangioma Cavernous sinus Magnetic resonance imaging Diffusion weighted imaging

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面向任务的机器人操作机的姿态综合(英文)

面向任务的机器人操作机的姿态综合(英文)

转子电路接有斩波器时,异步电动机的恒转矩运行

第十三届全国机构学学术研讨会

作者：戴建生 paresh Shah School of Physical Sciences and Engineering King’s College University of LondonStrandLondon WC2R 2LSUK

This paper introduces a new representation of robotic dexterous manipulators based on the equivalent mechanism approach and presents a new way of manipulator *** orientation model is introduced based on the rotatability and characteristics of the new representation are *** synthesis focuses on the geometric analysis in the orientation representation with the given task crescent.

关键词： orientation synthesis manipulators robotics

来源： cnki会议评论

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南昌大学学报(工科版) 1980年第1期 24-34页

作者： paresh.C.SEN ,K.H.J.MA ,郑今明

研究一种使异步电动机运行于恒转矩状态的新控制线路,给出系统的基本线路和静特性分析。用等效电路分析和计算工作特性。推荐并研究了一种新的快速直流能耗制动方案。用实验来验证理论,以显示这一控制线路的可行性。

关键词：斩波器恒转矩运行转子电流导通直接直流变流器异步电动机感应电动机整流电流

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直流电动机可控硅控制方案评述

机器人 1979年第5期 29-37+77页

作者： paresh C.Sen S.R.Doradla ,张达明

一引言近年来,可控硅控制的直流传动已经代替了惯用的 Ward-Leonard 电动机发电机组。固体直流传动有许多突出的优点,如维修简单、体积较小、重量较轻、效率较高、时间响应较快等等。在由交流电源供电的用固体元件控制的直流传动中,通... 详细信息

一引言近年来,可控硅控制的直流传动已经代替了惯用的 Ward-Leonard 电动机发电机组。固体直流传动有许多突出的优点,如维修简单、体积较小、重量较轻、效率较高、时间响应较快等等。在由交流电源供电的用固体元件控制的直流传动中,通常采用相角控制方案(PA

关键词：电机电流转矩速度特性直流电机直流电动机

澳大利亚的居民用电需求：界限检验方法在协整理论中的一个应用[火用]

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华东电力 2006年第10期34卷 108-108页

作者： paresh Kumar Narayan Russell Smyth 吴先华(选编)

由于烟尘排放税等环保政策的实施，澳大利亚的电力消费将受到影响，论文在自回归分布滞后框架内，在协整理论中应用界限检验方法，估计了澳大利亚居民对电力需求的长期弹性和短期弹性。发现收入和电力的价格是影响居民电力需求的决定因... 详细信息

由于烟尘排放税等环保政策的实施，澳大利亚的电力消费将受到影响，论文在自回归分布滞后框架内，在协整理论中应用界限检验方法，估计了澳大利亚居民对电力需求的长期弹性和短期弹性。发现收入和电力的价格是影响居民电力需求的决定因素．其次是温度的作用，而天然气价格的影响却不显著。关于电力需求的长期收入弹性和价格弹性的结论与以前的研究是一致的，所得到的弹性值比以往研究所得值略小。

关键词：澳大利亚协整理论检验方法 [火用] 用电需求居民应用价格弹性

微软出资25亿美元收购沙盒游戏Minecraft

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投资与合作 2014年第21期 100-100页

作者： paresh Dave

微软正准备斥资25亿美元收购目前在X box平台上最流行的沙盒游戏Minecraft。微软CEO萨帝亚·纳德拉(Satya Nadella)在一份声明中表示:“Minecraft不但是一款很棒的游戏,还是一个由那些我们非常关注的、充满活力的人组成的开放平台。无...

微软正准备斥资25亿美元收购目前在X box平台上最流行的沙盒游戏Minecraft。微软CEO萨帝亚·纳德拉(Satya Nadella)在一份声明中表示:“Minecraft不但是一款很棒的游戏,还是一个由那些我们非常关注的、充满活力的人组成的开放平台。无论对微软还是对这个群体来说,这款游戏都蕴藏着丰富的新机遇。”有分析人士指处,与微软自有的游戏“光晕”相比,收购Minecraft将为其赢得年轻一代用户,并有机会向他们推介微软的其他产品和服务。此外,微软因此还拥有了除操作系统之外的自有产品,这也是纳德拉要实现的主要目标之一。

关键词：

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鸿沟

领导文萃 2016年第20期 67-67页

作者： paresh Nath

面对非洲难民潮问题,欧盟仍在积极寻找对策。最新的政策可谓"胡萝卜加大棒":一方面向非洲国家施压,另一方面为其提供援助,促其关闭边界,接收难民返乡。这背后是无法掩饰的政治困境:成千上万人在利比亚寻找机会前往欧洲,而欧盟国家几乎... 详细信息

面对非洲难民潮问题,欧盟仍在积极寻找对策。最新的政策可谓"胡萝卜加大棒":一方面向非洲国家施压,另一方面为其提供援助,促其关闭边界,接收难民返乡。这背后是无法掩饰的政治困境:成千上万人在利比亚寻找机会前往欧洲,而欧盟国家几乎已经没有吸收新难民的意愿。

关键词：难民非洲

Intrinsic Photoconductivity of Few-layered ZrS2 Phototransistors via Multiterminal Measurements

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Semiconductor Science and Information Devices 2019年第2期1卷 19-28页

作者： Rukshan M.Tanthirige Carlos Garcia Saikat Ghosh Frederick Jackson II Jawnaye Nash Daniel Rosenmann Ralu Divan Liliana Stan Anirudha V.Sumant Stephen A.McGill paresh C.ay Nihar R.Pradhan Layered Materials and Device Physics Laboratory Department of ChemistryPhysics and Atmospheric ScienceJackson State UniversityJacksonMS 39217USA National High Magnetic Field Laboratory TallahasseeFL 32310USA Kunming University of Science and Technology Kunming 650500China Center for Nanoscale Materials Argonne National Laboratory9700 S-Cass AvenueLemontIL-60439USA

We report intrinsic photoconductivity studies on one of the least examined layered compounds,***-atomic layer ZrS2 field-effect transistors were fabricated on the Si/SiO2 substrate and photoconductivity measurements were performed using both two-and four-terminal configurations under the illumination of 532 nm laser *** measured photocurrent as a function of the incident optical power at several source-drain(bias)*** observe a significantly large photoconductivity when measured in the multiterminal(four-terminal)configuration compared to that in the two-terminal *** an incident optical power of 90 nW,the estimated photosensitivity and the external quantum efficiency(EQE)measured in two-terminal configuration are 0.5 A/W and 120%,respectively,under a bias voltage of 650 *** the same conditions,the four-terminal measurements result in much higher values for both the photoresponsivity(R)and EQE to 6 A/W and 1400%,*** significant improvement in photoresponsivity and EQE in the four-terminal configuration may have been influenced by the reduction of contact resistance at the metal-semiconductor interface,which greatly impacts the carrier mobility of low conducting *** suggests that photoconductivity measurements performed through the two-terminal configuration in previous studies on ZrS2 and other 2D materials have severely underestimated the true intrinsic properties of transition metal dichalcogenides and their remarkable potential for optoelectronic applications.

关键词： Field-effect transistors Zirconium sulphide Phototransistor Responsivity Quantum efficiency