检索结果-南通市图书馆

Impact of El Nio on atmospheric circulations over East Asia and rainfall in China： role of the anomalous western North Pacific anticyclone

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2017年第5期60卷 1124-1132页

作者： ZHANG renHe MIN QingYe SU jingZhi Institute of Atmospheric Sciences Fudan University Shanghai 200433 China Chinese Academy of Meteorological Sciences Beijing 100081 China

This paper presents a review on the impact of El Nio on the interannual variability of atmospheric circulations over East Asia and rainfall in China through the anomalous anticyclone over western North Pacific(WNPAC). It explains the formation mechanisms of the WNPAC and physical processes by which the WNPAC affects the rainfall in China. During the mature phase of El Nio, the convective cooling anomalies over western tropical Pacific caused by the weakened convections trigger up an atmospheric rossby wave response, resulting in the generation of the WNPAC. The WNPAC can persist from the winter when the El Nio is in its peak to subsequent summer, which is maintained by multiple factors including the sustained presence of convective cooling anomalies and the local air-sea interaction over western tropical Pacific, and the persistence of sea surface temperature anomalies(SSTA) in tropical Indian and tropical North Atlantic. The WNPAC can influence the atmospheric circulations over East Asia and rainfall in China not only simultaneously, but also in the subsequent summer after an El Nio year, leading to more rainfall over southern China. The current paper also points out that significant anomalies of atmospheric circulations over East Asia and rainfall over southern China occur in El Nio winter but not in La Nio winter, suggesting that El Nio and La Nio have an asymmetric effect. Other issues, including the impact of El Nio diversity and its impact as well as the relations of the factors affecting the persistence of the WNPAC with summer rainfall anomalies in China, are also discussed. At the end of this paper some issues calling for further investigation are discussed.

关键词： Atmospheric circulations over East Asia rainfall in China E1 Nifio Anomalous western North Pacific anticyclone

radiofrequency ablation of pancreatic ductal adenocarcinoma:The past,the present and the future

在线全文

学校读者我要写书评

暂无评论

World journal of Gastrointestinal Oncology 2015年第2期7卷 6-11页

作者： Garvi j Pandya Vishal G Shelat Medicine Ministry of Health Holdings Pte LtdSingapore 308433 Singapore Division of Hepato-pancreatico-biliary Surgery Tan Tock Seng HospitalSingapore 308433Singapore

Pancreatic ductal adenocarcinoma(PDAC)is one of the most aggressive cancers with a grim overall 5-year survival rate of 5%.Advances in surgical techniques,critical care,molecular diagnosis,diagnostic imaging,endosonology and adjuvant therapy have improved outcomes;but still more needs to be *** is an urgent need to discover new avenues that may impact *** ablation(rFA)has attracted attention as an adjunctive treatment in PDAC.A review of English literature in Pub Med was done using the MESH terms for PDAC and *** the articles were reviewed and core information was tabulated for *** a comprehensive review of all articles the data was evaluated to discover the role of rFA in PDAC ***,contraindications,feasibility,success rate,safety,complications and impact on survival were reviewed and are discussed *** appears to be an attractive option for nonmetastatic locally advanced *** is feasible but has a significant *** the present time the integration of rFA into the management of pancreatic ductal adenocarcinoma is *** should be considered as having a complimentary role to current standard therapy in the multimodal management care *** is likely that indications and patient selection for pancreatic rFA will expand.

关键词： Pancreatic cancer radiofrequency ablation

Examining control,centrality and flexibility in Palladio’s villa plans using space syntax measurements

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Architectural research 2021年第3期10卷 467-482页

作者： Michael j.Dawes Michael j.Ostwald ju Hyun Lee UNSW Built Environment The University of New South WalesSydneyNSW 2052Australia

Andrea Palladio’s renaissance villas are amongst the most famous and widely studied examples of domestic architecture ever *** majority of past research about Palladio’s architecture employed historical,mathematical and computational methods to analyse their complex proportional systems and *** contrast,this paper examines three of Palladio’s arguments about his villas plans which relate to their spatial properties and topological ***,this paper uses a computational method e the justified plan graph(jPG)e to test two arguments about the location and significance of the primary salon on the plan,and a third about the extent to which the rooms in Palladio’s plans are,as he claims,flexible enough to contain alternative *** ten of Palladio’s piano nobile(main floor)plans from I Quattro Libri Dell’Architettura as cases,this paper develops mathematical data to test three hypotheses framed around Palladio’s plans and theories.

关键词： Andrea palladio Palladian villa renaissance architecture Space syntax justified plan graph(jPG)

Performance comparison of lithium-niobate-based extremely high-field single-cycle terahertz sources [Invited]

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2021年第11期19卷 98-106页

作者： György Tòth LászlòPálfalvi Szabolcs Turnár Zoltán Tibai Gábor Almási jános Hebling Institute of Physics University of PécsPécs 7624Hungary Szentagothai research Centre University of PécsPécs 7624Hungary MTA-PTE High-Field Terahertz research Group Pécs 7624Hungary

Tilted-pulse-front-pumping(TPFP) lithium-niobate terahertz(THz) pulse sources are widely used in pump-probe and control experiments since they can generate broadband THz pulses with tens of microjoules of energy. However, the conventional TPFP setup suffers from limitations, hindering the generation of THz pulses with peak electric field strength over 1 MV/***, a few setups were suggested to mitigate or even eliminate these limitations. In this paper, we shortly review the setups that are suitable for the generation of single-cycle THz pulses with up to a few tens of megavolts/centimeter focused electric field strength. The THz pulses available with the new layouts pave the way for previously unattainable applications that require extremely high electric field strength and pulse energy in the multi-millijoule range.

关键词： terahertz pulse generation nonlinear optics ultrafast optics

在线全文

学校读者我要写书评

暂无评论

质子微束对磷灰石中稀土元素的研究

核化学与放射化学 1991年第3期13卷 183-188页

作者：马鑫培 G.r.Palmer j.D.MacArthur 中国原子能科学研究院加拿大皇后大学物理系

应用质子激发X射线(PIXE)和质子激发γ射线(PIGE),分析了取自不同地质环境的14个磷灰石样品中的主体元素和替代元素。磷灰石中稀土元素含量对于球粒状陨石的标绘表明,绝大多数磷灰石样品对于轻稀土元素有富集现象。磷灰石本身并不表现... 详细信息

应用质子激发X射线(PIXE)和质子激发γ射线(PIGE),分析了取自不同地质环境的14个磷灰石样品中的主体元素和替代元素。磷灰石中稀土元素含量对于球粒状陨石的标绘表明,绝大多数磷灰石样品对于轻稀土元素有富集现象。磷灰石本身并不表现出特别富集轻稀土的特性。因此这种元素组份的分布可以成为磷灰石结晶过程所处的地质学环境中化学和物理条件的指证。

关键词： PIXE DIGE 磷灰石稀土元素

The neutron texture diffractometer at the China Advanced research reactor

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2016年第3期40卷 99-103页

作者：李眉娟刘晓龙刘蕴韬田庚方高建波余周香李玉庆吴立齐阳林峰孙凯王洪立 j.r.Santisteban 陈东风 Department of Nuclear Physics China Institute of Atomic Energy Beijing 102413 China Centro Atomico Bariloche CNEA Bariloche 8400 Argentina

The first neutron texture diffractometer in China has been built at the China Advanced research reactor,due to strong demand for texture measurement with neutrons from the domestic user community. This neutron texture diffractometer has high neutron intensity, moderate resolution and is mainly applied to study texture in commonly used industrial materials and engineering components. In this paper, the design and characteristics of this instrument are described. The results for calibration with neutrons and quantitative texture analysis of zirconium alloy plate are presented. The comparison of texture measurements with the results obtained in HIPPO at LANSCE and Kowari at ANSTO illustrates the reliability of the texture diffractometer.

关键词： neutron diffraction neutron texture diffractometer bulk texture industrial application

Beyond first-line chemotherapy for advanced pancreatic cancer:An expanding array of therapeutic options?

在线全文

学校读者我要写书评

暂无评论

World journal of Gastroenterology 2014年第9期20卷 2224-2236页

作者： Evan j Walker Andrew H Ko University of California Helen Diller Family Comprehensive Cancer Center San Francisco CA 94115 United States

While an increasing number of therapeutic options are now available for the first-line treatment of locally advanced or metastatic pancreatic cancer,the optimal choice for treatment in the second-line setting and beyond is less well defined.A variety of cytotoxic agents,either alone or in combination,have been evaluated,although primarily in the context of small single-arm or retrospective *** regimens have been associated with median progression-free survival rates in the range of 2-4 mo and overall survival rates between 4-8mo,highlighting the very poor prognosis of patients who are candidates for such *** therapies studied in this chemotherapy-refractory setting,meanwhile,have produced even worse efficacy *** the current article,we review the clinical evidence for treatment of refractory disease,primarily in patients who have progressed on front-line gemcitabine-based *** the process,we highlight the limitations of the available data to date as well as some of the challenges in designing appropriate clinical trials in this salvage setting,including how to select an appropriate control arm given the absence of a wellestablished reference standard,and the importance of incorporating predictive biomarkers and quality of life measures whenever possible into study design.

关键词： Pancreatic cancer refractory Second-line chemotherapy Gemcitabine

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

关于可控震源谐波失真的两种监控方法

物探装备 1993年第1期4卷 35-43页

作者： j.E.Martin r.E.White 张宏乐

连续监控可控震源的平板和反作用重锤加速度,可以提高可控震源勘探数据的质量。设备故障可随时检测,而不是在每天生产前后做一致性试验。设备发生故障时可及时排除,使勘探数据的质量不受影响。在勘探中,对可控震源在不同地表情况下,以... 详细信息

连续监控可控震源的平板和反作用重锤加速度,可以提高可控震源勘探数据的质量。设备故障可随时检测,而不是在每天生产前后做一致性试验。设备发生故障时可及时排除,使勘探数据的质量不受影响。在勘探中,对可控震源在不同地表情况下,以不同驱动电平工作可能产生的谐波失真实行监控,使可控震源工作效率达到最佳。并可识别因平板与地表不良的耦合所导致的相位问题和在野外标出其产生的位置。为使连续监控方法有效,需要对可控震源信号作快速分析。可控震源信号的频率一时间分析以往在处理中心进行,速度慢且需要有很大存贮量,不适于野外记录用技术分析。本文所提出的两种分析可控震源信号方法需用到矢端曲线和时变陷波滤波器,矢端曲线给出对可控震源性能和谐波失真的定性分析,快速时变滤波器给出存在于信号中谐波失真的定量及定性数据,并能发现可控震源的故障。在可控震源进行扫描时,无论矢端曲线还是滤波器都可对可控震源的重锤和平板加速度进行分析,并在可控震源移动到下一个震点之前自动向操作员提供处理结果。

关键词：谐波失真一致性矢端曲线派生噪声

Current status of radiology in China

在线全文

学校读者我要写书评

暂无评论

World journal of Gastroenterology 2000年第2期6卷 193-197页

作者： Zeng SM Zhou Kr Zhang ZY Peng Wj Yang FH Lin j Yang j Han XY Shanghai Med Univ Zhongshan Hosp Dept Radiol Shanghai 200032 Peoples R China

INTrODUCTIONradiology has been greatly advanced in China sinceits founding in 1949 and has been developed fasterand further more since China adopted the policy ofsocioeconomic reform in *** plays anincreasingly important role in the medical healthcare and treatment in the country and has reachedthe world’s advanced level in certain *** nowbriefly review the history of China’s radiology so asto give a clear picture of its development.

关键词： radiology/history radiology/leducation radiology/trends China