检索结果-南通市图书馆

THAI experimental research on hydrogen risk and source term related safety systems

Frontiers in Energy 2021年第4期15卷 887-915页

作者： Sanjeev GUPTA Martin FREITAG Gerhard POSS Becker Technologies gmbh Rahmannstrasse 11Eschborn 65760Germany

In the defense-in-depth concept employed for the safety of nuclear installations,maintaining integrity of containment as the last barrier is of high importance to limit the release of radioactivity to the environment in case of a severe *** active and passive safety systems implemented in containments of light water reactors(LWRs)are designed to limit the consequences of such *** the performance and reliability of such systems under accident conditions is critical to the safety of nuclear *** the aftermath of the Fukushima accident,there has been focus on re-examining the existing safety systems to demonstrate their capabilities for a broader range of boundary conditions comprising both the early as well as the late phases of an *** addition to the performance testing of safety systems,their interaction with containment atmosphere needs detailed investigations to evaluate the effects of operation of safety systems on H2 risk and fission product(FP)behavior in containment,which may ultimately have an impact on the source term to the *** this context,an extensive containment safety related experimental research has been conducted in a thermalhydraulics,hydrogen,aerosols,and iodine test facility(THAI,60 m3,single vessel)/(THAI+,80 m3,two interconnected vessels).Related to the subject of this paper,experimental investigations covered performance testing of various safety and mitigation systems,i.e.,containment spray,passive autocatalytic recombiner(PAR),pressure suppression pool(water pools),and effects of their operation on H2 risk and in-containment FP *** experimental results have provided a better phenomenological understanding and database for validation and further improvement of a safety analysis tool based on computation fluid dynamic(CFD)and lumped parameter(LP)modeling *** paper summarizes the main insights obtained from the aforesaid THAI experimental research covering safety systems

关键词： severe accident containment safety mitigation H2 risk source term

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Assessing the Storage Root Development of Cassava with a New Analysis Tool

引用

Plant Phenomics 2022年第1期4卷 43-57页

作者： Jens Wilhelm Tobias Wojciechowski Johannes A.Postma Dirk Jollet Kathrin Heinz Vera Bockem Mark Muller-Linow Institute of Plant Sciences IBG-2Forschungszentrum Julich GmbH52425 JulichGermany Tesla Automation gmbh 54595 PrumGermany

Storage roots of cassava plants crops are one of the main providers of starch in many South American,African,and Asian *** varieties with high yields is crucial for growing and *** requires a better understanding of the dynamics of storage root formation,which is usually done by repeated manual evaluation of root types,diameters,and their distribution in excavated *** introduce a newly developed method that is capable to analyze the distribution of root diameters automatically,even if root systems display strong variations in root widths and clustering in high *** application study was conducted with cassava roots imaged in a video acquisition *** root diameter distribution was quantified automatically using an iterative ridge detection approach,which can cope with a wide span of root diameters and *** approach was validated with virtual root models of known geometries and then tested with a time-series of excavated root *** on the retrieved diameter classes,we show plausibly that the dynamics of root type formation can be monitored qualitatively and *** conclude that this new method reliably determines important phenotypic traits from storage root crop *** method is fast and robustly analyses complex root systems and thereby applicable in high-throughput phenotyping and future breeding.

关键词： crops roots Storage

来源：

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

Dynamic in situ reconstruction of NiSe2 promoted by interfacial Ce2（CO3）2O for enhanced water oxidation

引用

Journal of Energy Chemistry 2024年第11期 472-480页

作者： Fengli Wei Jinghao Shen Jiayin Xie Zuyang Luo Luyan Shi Tayirjan Taylor Isimjan Xiulin Yang Jieshan Qiu Bin Wu Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical Sciences Guangxi Normal University Saudi Arabia Basic Industries Corporation (SABIC) at King Abdullah University of Science and Technology (KAUST) State Key Laboratory of Chemical Resource Engineering State Key Laboratory of Organic-Inorganic Composites College of Chemical Engineering Beijing University of Chemical Technology Helmholtz-Zentrum Berlin für Materialien und Energie gmbh Institute of Physics Humboldt University Berlin

Understanding and manipulating the structural evolution of water oxidation electrocatalysts lays the foundation to finetune their catalytic ***,we present a synthesis of NiSe2-Ce2（CO3）2O heterostructure and demonstrate the efficacy of interfacial Ce2（CO3）2O in promoting the formation of catalytically active centers to improve oxygen evolution ***-situ Raman spectroscopy shows that incorporation of Ce2（CO3）2O into NiSe2causes a cathodic shift of the Ni2+→Ni3+transition *** electrochemical impedance spectroscopy reveals that strong electronic coupling at heterogeneous interface accelerates charge transfer ***,density functional theory calculations suggest that actual catalytic active species of NiOOH transformed from NiSe2,which is coupled with Ce2（CO3）2O,can optimize electronic structure and decrease the free energy barriers toward fast oxygen evolution reaction（OER） ***,the resultant NiSe2-Ce2（CO3）2O electrode exhibits remarkable electrocatalytic performance with low overpotentials(268/304 mV@50/100 mA cm-2) and excellent stability(50 mA cm-2for 120 h) in the alkaline *** work emphasizes the significance of modulating the dynamic changes in developing efficient electrocatalyst.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Characterization of bright betatron radiation generated by direct laser acceleration of electrons in plasma of near critical density

引用

Matter and Radiation at Extremes 2024年第2期9卷 26-35页

作者： J.Cikhardt M.Gyrdymov S.Zähter P.Tavana M.M.Günther N.Bukharskii N.Borisenko J.Jacoby X.F.Shen A.Pukhov N.E.Andreev O.N.Rosmej Faculty of Electrical Engineering Czech Technical University in Prague16627 Prague 6Czech Republic Goethe University FrankfurtMax-von-Laue-Straße 160438 Frankfurt am MainGermany GSI Helmholtzzentrum für Schwerionenforschung gmbh Planckstraße 164291 DarmstadtGermany Focused Energy gmbh Im Tiefen See 4564293 DarmstadtGermany National Research Nuclear University MEPhI Kashirskoe shosse 31115409 MoscowRussian Federation Lebedev Physical Institute RAS Leninskiy Prospekt 53119991 MoscowRussian Federation Heinrich-Heine-University Düsseldorf Universitätsstrasse 1DüsseldorfGermany Joint Institute for High Temperatures RASIzhorskaya st.13Bldg.2125412 MoscowRussian Federation Moscow Institute of Physics and Technology Institutskiy Pereulok 9141700 DolgoprudnyRussia

Directed x-rays produced in the interaction of sub-picosecond laser pulses of moderate relativistic intensity with plasma of near-critical density are investigated. Synchrotron-like (betatron) radiation occurs in the process of direct laser acceleration (DLA) of electrons in a relativisticlaser channel when the electrons undergo transverse betatron oscillations in self-generated quasi-static electric and magnetic fields. In anexperiment at the PHELIX laser system, high-current directed beams of DLA electrons with a mean energy ten times higher than the ponderomotive potential and maximum energy up to 100 MeV were measured at 10^(19) W/cm^(2)laser intensity. The spectrum of directed x-raysin the range of 5–60 keV was evaluated using two sets of Ross filters placed at 0°and 10°to the laser pulse propagation axis. The differential x-ray absorption method allowed for absolute measurements of the angular-dependent photon fluence. We report 10^(13) photons/sr withenergies >5 keV measured at 0°to the laser axis and a brilliance of 10^(21) photons s^(−1) mm^(−2) mrad−2(0.1%BW)−1. The angular distributionof the emission has an FWHM of 14°–16°. Thanks to the ultra-high photon fluence, point-like radiation source, and ultra-short emissiontime, DLA-based keV backlighters are promising for various applications in high-energy-density research with kilojoule petawatt-class laserfacilities.

关键词： laser acceleration critical

来源：

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

10KA基于SCR技术的功率电感脉冲测量系统

引用

磁性元件与电源 2024年第7期 134-135,141页

作者： JC Sun Christian Teske 曹欣欣杨建民 Bs&T Frankfurt am Main gmbh 东莞铭普光磁股份有限公司

一款新的基于SCR(Semiconductor Control Rectifier半导体控制整流器)的高脉冲电流处理能力而开发的用于功率电感测量的脉冲测试系统。该测试系统可以通过高达10KA的脉冲电流对功率电感进行饱和性能测试和功耗测试,而且不会产生热应力... 详细信息

一款新的基于SCR(Semiconductor Control Rectifier半导体控制整流器)的高脉冲电流处理能力而开发的用于功率电感测量的脉冲测试系统。该测试系统可以通过高达10KA的脉冲电流对功率电感进行饱和性能测试和功耗测试,而且不会产生热应力。测试系统具有短路保护功能,可以避免因输出短路造成对测试系统的损坏。受益于SCR器件的高脉冲电流处理能力,该脉冲测试系统有一些独特的特性,并且和基于IGBT的测试系统相比具有一些突出的优点。

关键词： SCR半导体器件脉冲电流测试功耗测试功率电感饱和特性

来源：

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

Model Experiments on Melting of Alloys with Low Melting Temperature in a Medium with High Melting Temperature

引用

Journal of Iron and Steel Research International 1999年第2期6卷 1-9页

作者： Becker Jens-Ulrik Oeters Franz Thyssen-Krupp Stahl gmbh Technical University Berlin

Experiments of alloy melting were carried out in water/HCl H 2O eutectic model system. The eutectic has a solid liquid equilibrium temperature of -74 ℃. 5 cm diameter spheres of the eutectic in which three thermocouples in the core, on the edge and in the middle between them had been positioned were cooled to -196 ℃ in liquid nitrogen. After cooling the spheres were immersed into water of 10 ℃, and the changes of temperatures with time in the three thermocouples were measured. In some experiments the temperature on the outer side of the spheres where an ice shell grew up was also measured. In these experiments, the growing rate of the shell was additionally determined. The results for the first minute of the melting process, where the system can be considered as one dimensional, were described by an exact solution of Fouriers equation. The density of liquid ferromanganese at 1 500 ℃ was measured.

关键词： alloy melting model experiment

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

FerryBox: Using Automated Water Measurement Systems to Monitor Water Quality: Perspectives for the Yangtze River and Three Gorges Dam

引用

Journal of Earth Science 2010年第6期21卷 861-869页

作者： Carsten Frank Friedhelm Schroeder Wilhelm Petersen Helmholtz-Zentrum Geesthacht gmbh Institute for Coastal Research

The building of the Three Gorges Dam （Hubei （湖北） Province, China） has transformed a region with an economy based on sustainable agriculture for millennia into an entirely different environment within an exceptionally short time. This disrupts the natural biogeochemieal cycles of carbon, nutrients, and metals and possibly will affect the whole catchment including downstream ecosystems, such as wetlands, estuaries, deltas, and adjacent sea areas. Starting from changes that have already been documented, this article concentrates on the possible use of a ＂FerryBox＂, which is an automated water quality measurement system on board a ship or on shore, to monitor the short and long term development of the quality of the river water in the backwater area and downstream of the dam. While there are already research programmes running to monitor the water quality of the river and the backwater area, these programs are limited to ship campaigns with sampling and laboratory analysis. The spatial and temporal resolution of such measurements is not sufficient for an overall assessment of the water quality and for prognoses in the context of anthropogenic and climate change. Therefore, a concept of applying regular automated observations by a FerryBox is presented. It is shown that such systems are very well suited to give feedback for the assessment of measures to improve the water quality.

关键词： Three Gorges Dam Yangtze River eutrophication FerryBox.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microstructuring of titanium surfaces with plasma-modified titanium particles by cold spraying

引用

Particuology 2019年第3期17卷 90-104页

作者： P. Breuninger F. Krull S. Buhl A. Binder R. Merz M. Kopnarski B. Sachweh S. Antonyuk Technische Universitat Kaiserslautern Institute of Particle Process Engineering Kaiserslautern Germany BASFSE Ludwigshafen Germany IFOS gmbh Institute for Surface and Thin Film Analysis GmbH Kaiserslautern Germany

Although the deposition mechanisms of the cold spray process are well studied, few reports regarding the use of surface-modified particles exist. Herein, titanium particles 3-39 μm in size and with an angular shape were modified in a plasma-enhanced chemical vapor deposition process in Ar, Ar-C2H2, and N2 plasmas. After Ar-C2H2 and N2 treatments, the respective presence of TiC and TiN on the particle surface was confirmed via transmission electron microscopy and energy-dispersive X-ray, X-ray photoelectron, and Raman spectroscopies. The powders were deposited on titanium substrates by cold spray experiments, where unmodified particles up to 10(xm in size exhibited a successful surface bon ding. This finding was described by an existing analytical model, whose parameters were achieved by computational fluid dynamics simulations taking the particle shape factor into account:. A good deposition of plasma-modified particles up to 30 μm in size was experimentally observed, exhibiting an upper size limit larger than that predicted by the model. Higher surface roughness values were found for plasmamodified particles, as determined by 3D scanning electron microscopy. The water contact angle indicated that argon treatment influenced the wettability. Tribological tests showed a decrease of the initial friction coefficient from 0.53 to 0.47 by microstructuring.

关键词： Chemical vapor deposition Cold spray Surface modification Computational fluid dynamics

来源：

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

Comprehensive review of tribometer dynamics-Cycle-based data analysis and visualization

引用

Friction 2022年第5期10卷 772-786页

作者： Josef PROST Guido BOIDI Thomas LEBERSORGER Markus VARGA Georg VORLAUFER AC2Tresearch gmbh Wiener Neustadt 2700Austria

Tribologists often rely on triboexperiments to investigate factors that affect a *** inherent dynamic behavior of the respective tribometer setups and its effect on data interpretation remain often *** this study,a comprehensive analysis of sensor data obtained from lubricated and dry triboexperiments is *** are generated on a pin-on-disc test rig with a silicon nitride ball on a steel disc contact with a rotation frequency of~3 ***-speed acquisition of sensor data up to 5 kHz is performed to resolve changes in the data within individual *** characteristic frequencies of the system and their temporal evolution are determined via time--frequency analysis,which reveals periodic patterns in the sensor ***-based data evaluation allows the detection of localized events and changes during an operation and considerably reduces the apparent measurement uncertainty,as compared with an unreduced *** data analysis and visualization routines presented herein may serve as a prototype for further application to tribometer setups.

关键词： high-speed data acquisition time-frequency analysis(TFA) cycle-resolved analysis pin-on-disc tribometer

来源：

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

TOX: a rediscovered master molecular actor to enhance immuno-oncology interventions

引用

Cellular & Molecular Immunology 2020年第5期17卷 558-560页

作者： Alain A.Vertès NxR Biotechnologies gmbh BaselSwitzerland

Checkpoint blockade therapy and adoptive therapy with engineered human immune effector cells are paradigm-changing innovations that have already revolutionized the treatment of cancer for which critical advances have been achieved with CTLA-4 or PD-1/PD-L1 inhibitors and with chimeric antigen receptor T(CAR-T)cells,*** paradigm-changing innovations reflect the intricate relationships between inflammatory and immunological events and the pathobiology of *** is,for example,described as“wounds that do not heal”,and deeper exploration of the correspondence between the molecular events that occur in cancer and those that occur in chronic infection constitutes a rich ground for fundamental discoveries.

关键词： cancer therapy Cancer

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：