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Milliwatt terahertz harmonic generation from topological insulator metamaterials

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Light(Science & Applications) 2022年第11期11卷 2766-2773页

作者： Klaas-Jan Tielrooij Alessandro Principi David Saleta Reig Alexander Block Sebin varghese Steffen Schreyeck Karl Brunner Grzegorz Karczewski Igor Ilyakov Oleksiy Ponomaryov Thales V.A.G.de Oliveira Min Chen Jan-Christoph Deinert Carmen Gomez Carbonell Sergio O.Valenzuela Laurens W.Molenkamp Tobias Kiessling Georgy V.Astakhov Sergey Kovalev Catalan Institute of Nanoscience and Nanotechnology(ICN2) BIST and CSICCampus UABBellaterraBarcelona 08193Spain Department of Applied Physics TU EindhovenDen Dolech 25612 AZ EindhovenThe Netherlands School of Physics and Astronomy University of ManchesterM139PL ManchesterUK Physikalisches Institut(EP3) Universitat WurzburgAm Hubland97074 WurzburgGermany Institute of Physics Polish Academy of ScienceAl.Lotnikow 32/46PL-02668 WarsawPoland Helmholtz Zentrum Dresden-Rossendorf Bautzner Landstr.40001328 DresdenGermany ICREA Pg.Lluis Companys 2308010 BarcelonaSpain Institute for Topological Insulators Am HublandD-97074 WurzburgGermany

Achieving effcient,high-power harmonic generation in the terahertz spectral domain has technological applications,for example,in sixth generation(6G)communication *** Dirac fermions possess extremely large terahertz nonlinear susceptibilities and harmonic conversion ***,the observed maximum generated harmonic power is limited,because of saturation effects at increasing incident powers,as shown recently for ***,we demonstrate room-temperature terahertz harmonic generation in a Bi_(2)Se_(3) topological insulator and topological-insulator-grating metamaterial structures with surface-selective terahertz field *** obtain a third-harmonic power approaching the miliwatt range for an incident power of 75 mW-an improvement by two orders of magnitude compared to a benchmarked graphene *** establish a framework in which this exceptional performance is the result of thermodynamic harmonic generation by the massless topological surface states,benefiting from ultrafast dissipation of electronic heat via surface-bulk Coulomb *** results are an important step towards on-chip terahertz(opto)electronic applications.

关键词： harmonic insulator incident

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低温容器泄压装置的容量要求

低温与特气 1988年第4期6卷 13-16页

作者： A．P．varghese 顾荣而刘雅珍杭州制氧机研究所化工部光明化工研究所美国

无论流体热力学状态如何,根据热导率和比热输入所导出的方程,可计算其泄压装置的容量要求。该方程适用于液体全液排出、饱和液体和汽-汽排出、饱和液体和汽-液排出,以及超临界液体系统的普遍情况。

关键词：低温容器泄压装置容量 API-CGA公式比热输入热导率

Spectrum of cardiac manifestations and its relationship to outcomes in patients admitted with scrub typhus infection

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World Journal of Critical Care Medicine 2018年第1期7卷 16-23页

作者： Gunasekaran Karthik Thomas Isaiah Sudarsan John Victor Peter Thambu Sudarsanam George M varghese Paul Kundavaram Sowmya Sathyendra Ramya Iyyadurai Kishore Pichamuthu Department of Medicine Christian Medical College Medical Intensive Care Unit Christian Medical College Department of Infectious Diseases Christian Medical College

AIM To study the spectrum of cardiac manifestations in scrub typhus infection and assess its relationship to *** Demographic data, electrocardiographic(ECG) changes, left ventricular (LV) systolic and diastolic function, myocardial injury (defined as troponin T > 14 pg/mL), and pericardial effusion were documented. Myocarditis was diagnosed when myocardial injury was associated with global LV systolic dysfunction. The relationship between myocarditis and outcomes was assessed using logistic regression analysis and expressed as odds ratio(OR) with 95%*** The cohort(n = 81; 35 males) aged 49.4 ± 16.1 years(mean, SD) presented 8.1 ± 3.1 d after symptom onset. The APACHE-Ⅱ score was 15.7 ± 7.0. Fortyeight (59%) patients were ventilated, and 46 (56%) required vasoactive agents. Mortality was 9.9%. ECG changes were non-specific; sinus tachycardia was the most common finding. Myocardial injury was evident in 61.7% of patients and LV systolic dysfunction in 30.9%. A diagnosis of myocarditis was made in 12.3%. In addition, seven patients with regional wall motion abnormalities had LV systolic dysfunction and elevated cardiac enzymes. Mild diastolic dysfunction was observed in 18 (22%) patients. Mild to moderate pericardial effusion was seen in 51%. On multivariate logistic regression analysis, patients with myocarditis tended to be older (OR = 1.04, 95%CI: 0.99-1.09), had shorter symptom duration (OR = 0.69, 95%CI: 0.49-0.98), and tended to stay longer in hospital(OR = 1.17, 95%CI: 0.98-1.40). Myocarditis was not associated with increased *** In scrub typhus infection, cardiac manifestations are frequent and associated with increased morbidity but not mortality.

关键词： Scrub typhus Myocarditis Outcome

Delayed inflammatory pulmonary syndrome: A distinct clinical entity in the spectrum of inflammatory syndromes in COVID-19 infection?

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World Journal of Critical Care Medicine 2023年第4期12卷 226-235页

作者： Prithviraj Bose Binila Chacko Ashwin Oliver Arul Leena Robinson Vimala Balamugesh Thangakunam George M varghese Mohan Jambugulam Audrin Lenin John Victor Peter Department of Medical Intensive Care Christian Medical CollegeVellore 632004Tamil NaduIndia Department of Radiodiagnosis Christian Medical CollegeVellore 632004Tamil NaduIndia Department of Pulmonary Medicine Christian Medical CollegeVellore 632004Tamil NaduIndia Department of Infectious Disease Christian Medical CollegeVellore 632004Tamil NaduIndia Department of Medicine Christian Medical CollegeVellore 632004Tamil NaduIndia

BACKGROUND During the second wave of the coronavirus disease 2019(COVID-19)pandemic,a subset of critically ill patients developed delayed respiratory deterioration in the absence of new infection,fluid overload or extra-pulmonary organ *** To describe the clinical and laboratory characteristics,outcomes,and management of these patients,and to contrast this entity with other post COVID-19 immune dysregulation related inflammatory *** This was a retrospective observational study of adult patients admitted to the medical intensive care unit of a 2200-bed university affiliated teaching hospital,between May and August 2021,who fulfilled clearly defined inclusion and exclusion *** was assessed by a change in PaO_(2)/FiO_(2) ratio and levels of inflammatory markers before and after immunomodulation,duration of mechanical ventilation after starting treatment,and survival to *** Five patients developed delayed respiratory deterioration in the absence of new infection,fluid overload or extrapulmonary organ dysfunction at a median interquartile range(IQR)duration of 32(23-35)d after the onset of *** patients had elevated inflammatory markers,required mechanical ventilation for 13(IQR 10-23)d,and responded to glucocorticoids and/or intravenous *** patient died(20%).CONCLUSION This delayed respiratory worsening with elevated inflammatory markers and clinical response to immunomodulation appears to contrast the well described Multisystem Inflammatory Syndrome–Adults by the paucity of extrapulmonary organ *** diagnosis can be considered in patients presenting with delayed respiratory worsening,that is not attributable to cardiac dysfunction,fluid overload or ongoing infections,and associated with an increase in systemic inflammatory markers like C-reactive protein,inteleukin-6 and ferritin.A good response to immunomodulation can be *** delayed inflammatory pulmonary syndrome may re

关键词： COVID-19 ARDS Multisystem Inflammatory Syndrome in Adults Long COVID Organizing pneumonia

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两相“类催化性颗粒”湍流

两相“类催化性颗粒”湍流

第十一届全国流体力学学术会议

作者：王子奇 varghese Mathai 孙超清华大学能源与动力工程系布朗大学机械学院

自然对流作为传热方式之一,由于其具有安全、经济、自发进行等固有特点,被广泛用于能源领域和工业加热/冷却设备等多种工业技术中。热对流研究的核心问题是如何极大地提高传热效率。许多已有研究都是围绕如何增强传热展开的,但是少有能... 详细信息

自然对流作为传热方式之一,由于其具有安全、经济、自发进行等固有特点,被广泛用于能源领域和工业加热/冷却设备等多种工业技术中。热对流研究的核心问题是如何极大地提高传热效率。许多已有研究都是围绕如何增强传热展开的,但是少有能突破湍流掺混的固有限制的。我们提出"类催化型颗粒湍流系统",即在传统的以水为基础的热对流系统中,仅引入少量第二种液体(HFE 7000,具有低沸点,按体积计加入约1%),调整对流槽下底板温度使其高于低沸点液体的沸点,并保持上板温度低于低沸点液体的沸点,低沸点液体发生相变即可产生一种高效的"类催化性颗粒"湍流系统。这一系统中的传热载体增多,不仅包含传统自然对流中的冷羽流和热羽流,还包括更有效的传热载体即"类催化性颗粒":两相气泡、低沸点液滴以及从下板脱落的两相羽流。我们通过设计精密的实验以及严密的理论分析证明这一新理念的可行性。在这一新型湍流系统中,两相热载体元素作为传统的基于热羽流的热载体的补充,超越湍流掺混带来的固有限制,形成了强相干结构,可以极高效率地传递热量,并且热量传递过程具有自组织、自维持特性。与传统的湍流系统相比,有效的热传递提高了近500%,这远远超过(迄今为止)报道的在热对流系统中使用聚合物,纳米颗粒,纳米流体和陶瓷金属复合材料等作为辅助的传热量。这种新型的可调、可控的类催化型颗粒湍流能够从很小的温度梯度中汲取能量,而且整个系统形成沸腾-凝结的自维持型动态循环,可以长时间安全、稳定运行。我们发现传热增强的机理有两方面:一是由于相变潜热提供额外传热机制;二是由于两相气泡、液滴流的运动所带来的扰动形成流场的强掺混。类催化型颗粒可以使得工作系统内液体快速掺混,这一特性将此"类催化性颗粒"湍流机制的应用范围扩展到了无运动元件的(低剪切)混合设备,也是具有生物活性成分的系统增强掺混效应的理想选择。"类催化性颗粒"物质是安全的(不腐蚀,不易燃和不消耗臭氧层(ODP0)),因此有望在现代临床,生化和核工程热交换器中成为一种高效的传热方式。同时,这一新理念为解决对流传热效率提升提供了突破性思路。

关键词：对流沸腾-凝结传热增强液滴气泡

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新型可降解水凝胶软骨组织工程支架材料

新型可降解水凝胶软骨组织工程支架材料

甘蔗氮磷钾肥不同施用水平对甘蔗养份吸收的影响

2011年全国高分子学术论文报告会

作者：张超廖立琼李皓 Shyni varghese 中山大学工学院生物医学工程系 Department of Bioengineering University of CaliforniaSan DiegoLa JollaCA 92093USA 武汉大学化学与分子科学学院高分子科学系

＜正＞在前期工作合成新型聚三亚甲基碳酸酯-聚乙二醇-聚三亚甲基碳酸酯三嵌段大分子前体及其水凝胶基础上,以该水凝胶包覆牛原代软骨细胞并进行体外培养;研究其作为软骨组织工程支架材料的性能。在该新型水凝胶支架材料中,观查到软骨... 详细信息

＜正＞在前期工作合成新型聚三亚甲基碳酸酯-聚乙二醇-聚三亚甲基碳酸酯三嵌段大分子前体及其水凝胶基础上,以该水凝胶包覆牛原代软骨细胞并进行体外培养;研究其作为软骨组织工程支架材料的性能。在该新型水凝胶支架材料中,观查到软骨细胞的聚

关键词：三亚甲基碳酸酯水凝胶软骨细胞细胞聚集组织工程支架材料

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福建甘蔗 2006年第1期 41-43页

作者： V. Ramesh Sumansusan varghese 陈玉水（译）旱地农业研究所海得拉巴喀拉拉农业大学农学院不详

对27个施用不同数量氮磷钾肥组合处理的甘蔗的＋3，＋4，＋5和＋6指标组织叶片养份含量与甘蔗养份吸收量之间进行相关分析，结果表明，氮、钾肥施用量与甘蔗的养份吸收量之间显著正相关。第二次采集的第3、6叶含氮量与甘蔗的养份吸收量... 详细信息

对27个施用不同数量氮磷钾肥组合处理的甘蔗的＋3，＋4，＋5和＋6指标组织叶片养份含量与甘蔗养份吸收量之间进行相关分析，结果表明，氮、钾肥施用量与甘蔗的养份吸收量之间显著正相关。第二次采集的第3、6叶含氮量与甘蔗的养份吸收量之间显著正相关，不含叶鞘的第3片叶含磷量与甘蔗的养份吸收量之间负相关，第五次采集的不含叶鞘的第6片叶含钾量与甘蔗的养份吸收量之间显著正相关。

关键词：养份含量氮磷钾肥吸收量施用量甘蔗正相关组合处理相关分析水含氮量

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剑麻短纤维增强天然橡胶胶料的流变性能

橡胶参考资料 1994年第11期24卷 30-34页

作者： Siby varghese Baby Kuriakose Sabu Thomas 荆玉琪

1 前言加入炭黑、白炭黑等补强性填料可改善弹性体的力学性能。近年来,已证明加入合适的短纤维可进一步提高力学性能。Derri-nger曾在天然橡胶(NR)中使用人造丝。

关键词：橡胶天然橡胶混炼胶短纤维增强流变性

Intravenous Doxycycline, Azithromycin, or Both for Severe Scrub Typhus

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四川生理科学杂志 2023年第3期45卷 536-536页

作者： George M varghese 不详

Background:The appropriate antibiotic treatment for severe scrub typhus,a neglected but widespread reemerging zoonotic infection,is ***:In this multicenter,double-blind,randomized,controlled trial,we compared the efficacy of intravenous doxycycline,azithromycin,or a combination of both in treating severe scrub *** who were 15 years of age or older with severe scrub typhus with at least one organ involvement were *** patients were assigned to receive a 7-day course of intravenous doxycycline,azithromycin,or both(combination therapy).The primary outcome was a composite of death from any cause at day 28,persistent complications at day 7,and persistent fever at day 5.

关键词： involvement intravenous Intravenous