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区域供热 2024年第2期 17-28页

作者：旷文琦王保忠刘洋刘群波广东美的制冷设备有限公司广东佛山528000

对pvt光伏光热技术的研究现状进行调研和整理,结果表明:相比于普通光伏系统,pvt系统的综合效率有10%~16%的提升;通过经济性分析,应用pvt技术的采暖、热水方案在5~10年能收回初投资。

关键词： pvt 传热强化经济性分析系统性能优化

中型直膨式太阳能pvt热泵系统性能实验研究

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工程热物理学报 2023年第11期44卷 2934-2940页

作者：姜山姚剑刘文杰贾腾郑思航赵耀代彦军上海交通大学机械与动力工程学院太阳能发电与制冷教育部工程研究中心上海200240

对一种中型直膨式太阳能pvt(光伏/光热)热泵热电联产系统进行了实验研究。通过对PV(光伏)组件与直膨式集热/蒸发器的合理耦合构建pvt热泵系统,直膨式背板可吸收太阳能电池废热,降低太阳能电池温度,有效提高光伏组件发电效率,同时提高了... 详细信息

对一种中型直膨式太阳能pvt(光伏/光热)热泵热电联产系统进行了实验研究。通过对PV(光伏)组件与直膨式集热/蒸发器的合理耦合构建pvt热泵系统,直膨式背板可吸收太阳能电池废热,降低太阳能电池温度,有效提高光伏组件发电效率,同时提高了热泵循环蒸发温度和蒸发压力,改善了热泵系统的运行性能。背板采用新型直膨式集热/蒸发器流道结构,结合pvt组件阵列管路设计,有效提升了冷媒分布均一性和pvt组件工作温度的均匀性。实验结果表明系统在热水模式下的平均COP(Coefficient of Performance)可达6.45,供暖模式的平均COP达4.24。系统所发电量可用于自身压缩机、水泵运行或并入电网,且提供55℃以上的热水,从而实现太阳能pvt热泵系统高效热电联产。

关键词： pvt 直膨式热泵热电联产实验研究

What we should know about portal vein thrombosis in cirrhotic patients:A changing perspective

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World Journal of Gastroenterology 2012年第36期18卷 5014-5020页

作者： Francesca Romana Ponziani Maria Assunta Zocco Matteo Garcovich Francesca D'Aversa Davide Roccarina Antonio Gasbarrini Internal Medicine and Gastroenterology Policlinico A.GemelliCatholic University of Romelargo A.Gemelli800168 RomeItaly

Portal vein thrombosis(pvt) is one of the most common complications occurring during the natural course of liver cirrhosis.Even though pvt is often asymptomatic,the worsening of liver function,an unexpected episode of gastrointestinal bleeding or ascitic decompensation may be landmarks of pvt development.Beyond these clinical manifestations,it is debated whether pvt really has an impact on liver cirrhosis natural history or rather represents only one of its consequences.Probably pvt development should not only be considered as a matter of impaired blood flow or pro-coagulation tendency.On one hand,pvt seems a consequence of the worsening in portal vein outflow due to the increased hepatic resistance in cirrhotic livers.On the other hand,vascular microthrombosis secondary to necroinflammation may cause liver ischemia and infarction,with loss of hepatic tissue(parenchymal extinction) which is replaced by fibrotic tissue.Therefore,pvt might also be considered as the overt manifestation of the liver fibrosing process evolution and anticoagulant therapy may thus have microscopic indirect effects also on the progression of liver disease.At present,a connection between pvt development and the progression of liver fibrosis/cirrhosis has not yet been demonstrated.Nevertheless,it is not clear if pvt development may worsen cirrhotic patients' outcome by itself.Some authors tried to assess liver transplant benefit in pvt cirrhotic patients but data are contrasting.In this review,we will try to answer these questions,providing a critical analysis of data reported in literature.

关键词：血栓形成肝硬化门静脉患者肝纤维化 pvt 抗凝血剂标志性建筑

Portal ductopathy:Clinical importance and nomenclature

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World Journal of Gastroenterology 2011年第11期17卷 1410-1415页

作者： Yusuf Bayraktar Department of Internal Medicine Gastroenterology ClinicHacettepe University HospitalsAnkara 06100Turkey

Non-cirrhotic portal hypertension(PHT)accounts for about 20%of all PHT cases,portal vein thrombosis(pvt) resulting in cavernous transformation being the most common cause.All known complications of PHT may be encountered in patients with chronic pvt.However,the effect of this entity on the biliary tree and pancreatic duct has not yet been fully established.Additionally,a dispute remains regarding the nomenclature of common bile duct abnormalities which occur as a result of chronic pvt.Although many clinical reports have focused on biliary abnormalities,only a few have evaluated both the biliary and pancreatic ductal systems.In this review the relevant literature evaluating the effect of pvt on both ductal systems is discussed,and findings are considered with reference to results of a prominent center in Turkey,from which the term"portal ductopathy"has been put forth to replace"portal biliopathy".

关键词：临床意义门户术语 pvt PHT 血栓形成临床报告肝硬化

The Other Face of the Nucleus Accumbens:Aversion

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Neuroscience Bulletin 2016年第6期32卷 569-571页

作者： Ying Han Lin Lu Institute of Mental Health National Clinical Research Center for Mental DisordersKey Laboratory of Mental Healthand Peking University Sixth HospitalPeking University National Institute on Drug Dependence and Beijing Key Laboratory of Drug Dependence Peking University Peking-Tsinghua Center for Life Sciences and PKU-IDG/McGovern Institute for Brain Research Peking University

The nucleus accumbens （NAc） is thought to integrate information that is conveyed by （1） dopaminergic inputs from the midbrain and （2） glutamatergic inputs from limbic and cortical regions, including the amygdala, prefrontal cortex （PFC）, hippocampus, and thalamus [1], and signal to the basal ganglia motor system to guide appropriate behaviors. Addictive drug use is proposed to hijack this system, enhancing the brain＇s reactivity to drug cues and triggering drug-seeking and relapse after prolonged with- drawal [2, 3]. Both positive reinforcement （rewarding effects of drugs） and negative reinforcement （aversive emotional state associated with withdrawal） have been considered to play critical roles in the etiology and main- tenance of drug addiction, and NAc neurons are capable of processing both reward and aversion [4, 5]. Optogenetic activation of inputs from the PFC, ventral hippocampus （vHipp）, and basolateral amygdala （BLA） to the NAc drives positive reinforcement and facilitates reward- seeking behavior [6, 7], but a recent paper in Nature [8] has identified another face of the NAc. The pathway from the paraventricular nucleus of the thalamus （pvt） to the NAc is key to the aversive emotional state of drug withdrawal.

关键词： pvt MSNs

直膨式太阳能pvt热泵热水系统在不同城市运行性能仿真与分析

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动力工程学报 2023年第12期43卷 1607-1614页

作者：陆王琳施雨鲍佳麒刘文杰代彦军上海发电设备成套设计研究院有限责任公司上海200240 上海交通大学机械与动力工程学院太阳能发电与制冷教育部工程研究中心上海200240

基于直膨式太阳能光伏光热(pvt)热泵热水系统的工作原理,根据迭代算法建立了系统的仿真模型,以探究系统在不同环境条件下的运行性能。结果表明:在上海、北京、拉萨、兰州、昆明和广州,直膨式pvt热泵热水系统在夏季典型工作日的平均COP... 详细信息

基于直膨式太阳能光伏光热(pvt)热泵热水系统的工作原理,根据迭代算法建立了系统的仿真模型,以探究系统在不同环境条件下的运行性能。结果表明:在上海、北京、拉萨、兰州、昆明和广州,直膨式pvt热泵热水系统在夏季典型工作日的平均COP分别为7.34、7.30、6.98、8.18、6.24和6.79,加热定量热水所需时间分别为275 min、273 min、279 min、243 min、314 min和295 min,冬季典型工作日的平均COP分别为5.59、5.21、6.05、5.03、6.48和5.43,加热定量热水所需时间分别为344 min、364 min、316 min、376 min、298 min和359 min;在上海、北京、拉萨、兰州、昆明和广州,相对于纯光伏组件,pvt组件的全年平均发电增益分别为9.28%、8.56%、10.42%、10.01%、7.70%和7.64%。

关键词： pvt 热泵直膨式环境条件仿真模拟

直膨式太阳能pvt热泵系统性能仿真及全年运行性能分析

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制冷学报 2022年第3期43卷 161-166页

作者：刘文杰姚剑代彦军上海交通大学机械与动力工程学院太阳能发电与制冷教育部工程研究中心上海200240

本文对基于直膨式pvt(光伏光热)组件的太阳能热泵系统进行了数学模型的构建及性能仿真,分析了系统在上海地区的全年运行性能。通过直膨式集热/蒸发器将热泵系统与光伏组件相耦合,吸收光伏组件在工作时产生的废热,在降低光伏组件工作温... 详细信息

本文对基于直膨式pvt(光伏光热)组件的太阳能热泵系统进行了数学模型的构建及性能仿真,分析了系统在上海地区的全年运行性能。通过直膨式集热/蒸发器将热泵系统与光伏组件相耦合,吸收光伏组件在工作时产生的废热,在降低光伏组件工作温度、提升组件发电效率的同时,提升了热泵循环的蒸发温度,从而改善了热泵系统的运行性能。基于能量平衡与集热/蒸发器换热特性建立了仿真模型,并与实验结果进行对比,最大误差为6.2%。在上海地区的气温、辐照条件下对系统运行进行了逐日的模拟。模拟结果表明:当冷凝温度为55℃时,系统COP在2.67~9.06之间波动,全年平均COP可达5.47;系统全年平均蒸发温度为18.34℃,平均得热效率为100.06%;pvt组件的全年平均工作温度比光伏组件下降20.21℃,可带来11.80%的全年发电增益。

关键词：直膨式 pvt 太阳能热泵性能仿真

不同地区太阳能pvt热泵系统仿真模拟与运行性能分析

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动力工程学报 2023年第11期43卷 1487-1493页

作者：陆王琳陈培陆启亮鲍佳麒刘文杰代彦军上海发电设备成套设计研究院有限责任公司上海200240 上海交通大学机械与动力工程学院太阳能发电与制冷教育部工程研究中心上海200240

为探究环境条件的时空分布差异性对太阳能直膨式光伏光热(pvt)热泵系统运行性能的影响,进行数学建模与性能仿真,分析了系统在不同地区采暖季内的运行性能。结果表明:由于入射太阳辐射的效应,在不同地区,系统的采暖季平均蒸发温度都提高... 详细信息

为探究环境条件的时空分布差异性对太阳能直膨式光伏光热(pvt)热泵系统运行性能的影响,进行数学建模与性能仿真,分析了系统在不同地区采暖季内的运行性能。结果表明:由于入射太阳辐射的效应,在不同地区,系统的采暖季平均蒸发温度都提高至接近甚至超过环境温度的水平,显著改善了系统的热力性能;当冷凝温度为50℃时,系统在北京、拉萨、兰州的采暖季平均COP分别为3.67、5.01和3.41;采暖季平均单板得热功率分别为541 W、810 W和504 W,得热因子分别为71.7%、62.0%和79.3%,光伏发电增益分别为4.76%、8.67%和6.10%。

关键词： pvt 热泵直膨式时空分布差异仿真模拟

Wet etching and infrared absorption of AlN bulk single crystals

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Journal of Semiconductors 2009年第7期30卷 29-32页

作者：李巍巍赵有文董志远杨俊胡炜杰客建红 Institute of Semiconductors Chinese Academy of Sciences

The defects and the lattice perfection of an AlN（0001） single crystal grown by the physical vapor trans-port（pvt） method were investigated by wet etching, X-ray diffraction（XRD）, and infrared absorption, respectively.A regular hexagonal etch pit density（EPD） of about 4000 cm-2 is observed on the（0001） Al surface of an AlN single crystal.The EPD exhibits a line array along the slip direction of the wurtzite structure, indicating a quite large thermal stress born by the crystal in the growth process.The XRD full width at half maximum（FWHM） of the single crystal is 35 arcsec, suggesting a good lattice perfection.Pronounced infrared absorption peaks are observed at wave numbers of 1790, 1850, 2000, and 3000 cm-1, respectively.These absorptions might relate to impurities O, C, Si and their complexes in AlN single crystals.

关键词： AIN pvt etching defects

Early post-operative complications in living donor liver transplantation:prevention,detection and management

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Hepatobiliary & Pancreatic Diseases International 2007年第4期6卷 345-347页

作者： Allan M. Concejero Liver Transplantation Program Department of SurgeryChang Gung Memorial HospitalKaohsiung Medical Centerand Chang Gung University College of MedicineTaiwanChina

Living donor liver transplantation (LDLT) is now performed with high rates of success due to judicious recipient and donor selection,careful preoperative planning, excellent anesthesia management, and prompt detection and treatment of complications. The indications for LDLT for adult and pediatric recipients should be the same as for deceased donor liver transplantation. Early postoperative complications are often defined as complications occurring within the first 3 months

关键词： Early post-operative complications in living donor liver transplantation pvt