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794篇 您的检索式:作者名="Popa"
    题名 作者 年代 出处 被引量
1A Stable, Wideband Tunable, Near Transform-Limited, Graphene- Mode-Locked, Ultrafast Laser显示文摘We report an ultrafast laser mode-locked with a graphene saturable absorber.The linear dispersions of the Dirac electrons in graphene enable wideband tunability.We get-1 ps pulses,tunable between 1525 and 1559 nm,with stable mode-locking,insensitive to environmental perturbations.Zhipei Sun Daniel Popa Tawfique Hasan Felice Torrisi Fengqiu Wang Edmund J.R.Kelleher John C.Travers Valeria Nicolosi Andrea C.Ferrari 2010Nano Research2010,3,9:24
2天文轨道周期及火山活动对中上扬子区晚奥陶世-早志留世有机碳聚集的影响显示文摘基于野外露头资料,通过旋回地层学、地球化学等分析方法,运用有机碳同位素组成及化学风化指标数据序列,滤波输出记录在沉积物中的天文轨道参数,探讨天文轨道周期变化及火山活动对中上扬子区晚奥陶世—早志留世有机碳聚集的影响。研究表明,天文轨道周期驱动下的气候变化控制不同级次海平面波动,斜率周期调制的气候变化驱动海洋温盐循环,将位于高纬度区营养物质向中低纬度区转移,温盐循环是低纬度扬子区海洋生产力的主要动力。赫南特晚期海洋生产力指标Ba/Al及Ni/Al值显示,火山活动对海洋生产力贡献有限,对有机碳保存效率有显著影响;古海洋氧化还原环境指标Th/U、V/Cr及V/(V+Ni)值显示,火山活动与古海洋含氧量有显著关系,火山活动通过调节大洋含氧量来控制有机碳的保存效率,不同地区火山活动强度的差异是有机碳差异保存的重要因素。天文轨道周期驱动的有机碳输入动力及火山活动影响有机碳保存效率,二者耦合控制中上扬子区有机碳聚集。图10参74。张喜 张廷山 赵晓明 祝海华 MIHAI Emilian Popa 陈雷 雍锦杰 肖强 李红佼 2021石油勘探与开发2021,48,4:11
3Determination of REE,U,Тh,Ba,and Zr in simulated hydrogeological leachates by ICP-AES after matrix solvent extraction显示文摘A fast, reliable and precise method for the determination of Ba, Zr, Th, U, La, Ce, Eu, Hf and Gd in leaching solutions containing up to 1 mol/L FeCl3 by inductively coupled plasma-atomic emission spectrometry(ICP-AES) was described.Liquid-liquid extraction with diethyl ether was applied for selective and quantitative extraction of the iron with a decontamination factor of 65000.The study has enabled the determination of rare earth elements, U, Th Ba, and Zr, from the solution with high iron content with detection limits in the range of 1-24 ng/ml and a precision of 0.9%-4.6 % relative standard deviation.The developed method was simple and was adopted for implementation in a glove box for handling radioactive materials.Marin Ayranov Joaquin Cobos Karin Popa Vincenzo V.Rondinella 2009Journal of Rare Earths2009,27,1:8
4Issues and controversies in esophageal inlet patch显示文摘The proximal esophagus is rarely examined,and its inspection is often inadequate.Optical chromoendoscopy techniques such as narrow band imaging improve the detection rate of inlet patches in the proximal esophagus,a region in which their prevalence is likely underestimated.Various studies have reported correlations between these esophageal marks with different issues such as Barrett’s esophagus,but these findings remain controversial.Conflicting reports complicate the process of interpreting the clinical features of esophageal inlet patches and underestimate their importance.Unfortunately,the limited clinical data and statistical analyses make reaching any conclusions difficult.It is hypothesized that inlet patches are correlated with various esophageal and extraesophageal symptoms,diagnoses and the personalized therapeutic management of patients with inlet patches as well as the differential diagnosis for premalignant lesions or early cancers.Due to its potential underdiagnosis,there are no consensus guidelines for the management and follow up of inlet patches.This review focuses on questions that were raised from published literature on esophageal inlet patches in adults.Adriana Ciocalteu Petrica Popa Mircea Ionescu Dan Ionut Gheonea 2019World Journal of Gastroenterology2019,25,30:8
5Endoscopic closure of a gastrocolic fistula using the over-the-scope-clip-system显示文摘Gastrointestinal (GI) defects such as fistulas and leaks can be potentially closed endoscopically using hemo-clips and loops. However, hemoclips may not allow for closure of large defects and they do not exert enough tensile force to keep fibrotic defects larger than 5 mm approximated. Herein we present a case of successful endoscopic closure of a gastrocolic fistula in a severely malnourished patient with complex post-surgical upper GI anatomy. We strongly believe that this device is a major breakthrough for the management of various types of discontinuity defects or fistulas. In addition, we show the usefulness of placing a direct jejunostomy using the double balloon enteroscopy (DBE) technique during the same procedure. The concept of providing direct jejunal feedings while allowing for upper gas-trointestinal bowel rest to promote the healing of the minimally invasive endoscopic operation is novel. Thus, our case is unique and exemplifies the utility of mini-mally invasive endoscopic endoluminal surgery.Klaus Mnkemüller Shajan Peter Basem Alkurdi Jayapal Ramesh Daniel Popa C Mel Wilcox 2013World Journal of Gastrointestinal Endoscopy2013,5,8:5
6Multipurpose use of the ‘bear claw’ (over‐the‐scope‐clip system) to treat endoluminal gastrointestinal disorders显示文摘Klaus M?nkemüller Shajan Peter Jay Toshniwal Daniel Popa Marzena Zabielski Richard D. Stahl Jayapal Ramesh C. Mel Wilcox 2014Digestive Endoscopy2014,,3:4
7Bound states of solitons in a harmonic graphene-mode-locked fiber laser显示文摘We report bound states of solitons from a harmonic mode-locked fiber laser based on a solution-processed graphene saturable absorber. Stable soliton pairs, 26.2 ps apart, are generated with 720 fs duration. By simply increasing the pump power, the laser can also generate harmonic mode-locking with harmonics up to the26 th order(409.6 MHz repetition rate). This is a simple, low-cost, all-fiber, versatile multifunction ultrafast laser that could be used for many applications.BO FU JIN LI ZHANG CAO DANIEL POPA 2019Photonics Research2019,7,2:3
8A critical review of methods for characterisation of polyphenolic compounds in fruits and vegetables显示文摘Ioana Ignat Irina Volf Valentin I. Popa 2010Food Chemistry2010,,4:3
9Post‐stroke depression: mechanisms, translation and therapy显示文摘Isabelle Loubinoux Golo Kronenberg Matthias Endres Pascale Schumann‐Bard Thomas Freret Robert K. Filipkowski Leszek Kaczmarek Aurel Popa‐Wagner 2012J. Cell. Mol. Med2012,,9:3
10Model reference adaptive impedance control for physical human-robot interaction显示文摘这份报纸基于模型引用论述一个新奇提高的人机器人的相互作用系统适应控制。介绍方法交付保证稳定性和任务性能并且让二控制环。一个机器人特定的内部环,是一个 neuroadaptive 控制器,在网上学习机器人动力学并且让机器人象一个规定阻抗模型一样反应。这个环不使用任务信息,包括没有规定轨道。一个任务特定的外部环考虑人的操作符动力学并且使规定机器人阻抗模特儿适应以便联合人机器人的系统为任务性能有理想的特征。这个图案基于模型参考适应控制,但是一种非标准的形式。网络结果是有扩充人的操作符提供人机器人的队的改进任务性能的两个适应阻抗特征和 assistive 输入的一个控制器。模拟在一项重复点对点的运动任务验证建议控制器的表演。一个 PR2 机器人上的实际试验性的实现进一步支持途径的有效性。Bakur ALQAUDI Hamidreza MODARES Isura RANATUNGA Shaikh M. TOUSIF Frank L. LEWIS Dan O. POPA 2016Control Theory and Technology2016,14,1:3
11Influence of Genista Tinctoria L or Methylparaben on Subchronic Toxicity of Bisphenol A in Rats显示文摘Objective To evaluate the influence of an extract of Genista tinctoria L. herba(GT) or methylparaben(MP) on histopathological changes and 2 biomarkers of oxidative stress in rats subchronicly exposed to bisphenol A(BPA). Methods Adult female Wistar rats were orally exposed for 90 d to BPA(50 mg/kg), BPA+GT(35 mg isoflavones/kg) or BPA+MP(250 mg/kg). Plasma and tissue samples were taken from liver, kidney, thyroid, uterus, ovary, and mammary gland after 30, 60, and 90 d of exposure respectively. Lipid peroxidation and in vivo hydroxyl radical production were evaluated by histological analysis along with malondialdehyde and 2,3-dihydroxybenzoic acid detection. Results The severity of histopathological changes in liver and kidneys was lower after GT treatment than after BPA or BPA+MP treatment. A minimal thyroid receptor antagonist effect was only observed after BPA+MP treatment. The abnormal folliculogenesis increased in a time-dependent manner, and the number of corpus luteum decreased. No significant histological alterations were found in the uterus. The mammary gland displayed specific estrogen stimulation changes at all periods. Both MP and GT revealed antioxidant properties reducing lipid peroxidation and BPA-induced hydroxyl radical generation. Conclusion GT L. extract ameliorates the toxic effects of BPA and is proved to have antioxidant potential and antitoxic effect. MP has antioxidant properties, but has either no effect or exacerbates the BPA-induced histopathological changes.Daniela-Saveta POPA Pompei BOLFA Bela KISS Laurian VLASE Ramona PLTINEAN Anca POP Cornel CTOI Gianina CRISAN Felicia LOGHIN 2014Biomedical and Environmental Sciences2014,27,2:2
12Operator-valued martingale transforms in rearrangement invariant spaces and applications显示文摘In this paper the operator-valued martingale transform inequalities in rearrangement invariant function spaces are proved.Some well-known results are generalized and unified.Applications are given to classical operators such as the maximal operator and the p-variation operator of vector-valued martingales,then we can very easily obtain some new vector-valued martingale inequalities in rearrangement invariant function spaces.These inequalities are closely related to both the geometrical properties of the underlying Banach spaces and the Boyd indices of the rearrangement invariant function spaces.Finally we give an equivalent characterization of UMD Banach lattices,and also prove the Fefferman-Stein theorem in the rearrangement invariant function spaces setting.JIAO Yong WU Lian POPA Mihai 2013Science China Mathematics2013,56,4:2
13Material-aware mesh deformations显示文摘Tiberiu Popa Dan Julius Alla Sheffer 2006Proceedings of Shape Modelling International Matsushima Japan June2006,14,16:1
14Staphylococcus aureus and Wegener′s granulomatosis显示文摘Popa ER Stegeman CA Kallenberg CG 2002Arthritis Res2002,4,1:1
15An analysis of some fundamental problems in adaptive control of force and impedance behavior:Theory and experiments显示文摘Singh S K Popa D O 1995IEEE Transactions on Robotics and Automation1995,11,6:1
16On the electrical conduction in the interpolysilicon dielectric layers显示文摘COBIANU C POPA O DASCALU D 1993IEEE Electron Device Lett1993,14,5:1
17Circulation CXCL16 is not related to circulation ox LDL in patients with rheumatoid arthritis 显示文摘van Lieshout AW Popa C Meyer-Wentrup F 2007Boochem Biophys Res Commun2007,355,2:1
18The Calculus of the Inductance for A Coil of Reacurrent Loops Vertically and Partially Immersed in Magnetic Liquid显示文摘Popa Nicolae C Ioan De Sabata Potencz Ropert 1995Romanian Reports in Physics1995,47,35:1
19Sub 200 fs pulse genera-tion from a graphene mode-locked fiber laser显示文摘Popa D Sun Z Torrisi F 2010Applied Physics Letters2010,97,20:1
20Phase-Transfer Catalytic Activity of Polymer-Supported Ammonium and Phos- phonium Salts in Oxidation of Benzyl Alcohol with Hydrogen Peroxide 显示文摘Parvulescu V Popa A Davidescu C 1997React Funct Polym1997,33,23:1
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