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Near-wall Flow in the Blade Cascades Representing Last Rotor Root Sections of Large Output Steam Turbines

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Journal of Thermal Science 2021年第1期30卷 220-230页

作者： ŠIMURdA david FÜRST Jiří HÁLA Jindřich LUXA Martin bobČÍK Marek NOVÁK Ondřej SYNÁČJaroslav Institute of Thermomechanics of the Czech Academy of Sciences Prague 18200Czech Republic dpt.of Technical Mathematics Faculty of Mechanical EngineeringCTU in PraguePrague 12000Czech Republic doosan Skoda Power Pilsen 30100Czech Republic

This paper investigates the flow past two variants of root section profile cascades for a last stage rotor considering three-dimensional flow structures in the near-wall *** were drawn based on RANS numerical simulations of both variants and on the experimental data obtained by the 3 d traversing in the exit flow field of one of the *** of 3 d structures at two different regimes and its influence on aerodynamic characteristics of the blade cascades was *** distributions of Mach number along the profiles were compared with 2 d optical measurements and its distortion due to the presence of the sidewall was *** interaction between main vortical structures was described and its influence on the loading of the blades,mechanical energy losses and exit flow angle was *** results showed that for a front loaded blade the vortical structures appeared earlier and at a larger extent than for an aft loaded ***,due to different Mach number distribution,contribution of end wall flow to the energy losses was lower in the case of the aft loaded *** influence of the near wall flow on the loading was found to be rather weak while the deviation of the exit flow angle appeared to be comparable for both of the variants.

关键词： turbine blade cascade secondary flow near wall flow supersonic flow CFd experiment

detection of Burned Areas through Spectral Indices Analysis of Sentinel-2A Satellite Images in the Abokouamékro wildlife Reserve (Central, Côte d’Ivoire)

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纵波-转换横波联合反演技术在页岩气藏勘探中的应用

Open Journal of Applied Sciences（应用科学） 2024年第1期

作者： bob Kouakou Kouadio Sié Ouattara Alain Clément Jean-Marc Gala Bi Zaouri Jean-Luc Kouadio Kouassi Jean-Luc Edouard Kouakou N’guessan

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石油与天然气地质 2015年第1期36卷 168-174页

作者：袁书坤陈开远 bob A Hardage 冯志强魏水建中国地质大学能源学院北京100083 中国石化国际石油勘探开发公司北京100083 美国德克萨斯大学奥斯汀分校经济地质局德克萨斯奥斯汀78758 中国石化石油勘探开发研究院北京100083

近几年的页岩油气开发实践表明,页岩非均质性及水平井段的方位对页岩气单井产量、采收率及页岩气开采的经济性影响较大,而页岩非均质性主要受到天然微裂缝的影响。因此,开展页岩内天然微裂缝研究,寻找页岩储层"甜点"等是成功部署高产气... 详细信息

近几年的页岩油气开发实践表明,页岩非均质性及水平井段的方位对页岩气单井产量、采收率及页岩气开采的经济性影响较大,而页岩非均质性主要受到天然微裂缝的影响。因此,开展页岩内天然微裂缝研究,寻找页岩储层"甜点"等是成功部署高产气井、提高页岩气开采经济效益的必然选择。基于美国阿巴拉契亚盆地Marcellus页岩区的3C/3d高分辨率地震资料,利用快/慢速转换横波(PSV-1/PSV-2)反射时间厚度差法,对Marcellus地层的天然微裂缝发育带进行了探测。应用纵-转换横波(PP-PS)联合反演技术,结合联合反演密度、纵横波速度比(vP/vS)等组合属性参数,对天然微裂缝的开闭性及张性天然微裂缝孔隙空间的含气性分别进行了识别和检测,并利用实钻井资料对地球物理方法预测的页岩储层"甜点"(含气张性微裂缝)进行验证,取得较好效果。实际应用表明,纵-横波联合反演技术对于张性天然微裂缝的识别及含气性检测具有突出优势,能有效降低钻探风险。

关键词：转换横波联合反演微裂缝探测含气性检测 Marcellus页岩

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谈判技巧

数码调音新概念d8B MACKIE数码系统发生在调音台背后的故事

2019年

作者： (英) 鲍勃·埃瑟林顿

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乐器 2000年第3期 64-67页

作者： bob Tudor MACKIEd8B数码调音台

Prehospital transdermal glyceryl trinitrate for ultra- acute ischaemic stroke: data from the RIGHT- 2 randomised sham- controlled ambulance trial

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Stroke & Vascular Neurology 2024年第1期9卷 38-49,I0035-I0046页

作者： Jason Philip Appleton Lisa J woodhouse Craig S Anderson Sandeep Ankolekar Lesley Cala Mark dixon Timothy J England Kailash Krishnan Grant Mair Keith w Muir John Potter Christopher I Price Marc Randall Thompson G Robinson Christine Roffe Else C Sandset Jeffrey L Saver Angela Shone Aloysius Niroshan Siriwardena Joanna M wardlaw Nikola Sprigg Philip M Bath Stroke University Hospitals Birmingham NHS Foundation TrustBirminghamUK Institute of Applied HealthResearch University of Birmingham College of Medical and Dental SciencesBirminghamUK Stroke Trials Unit Mental Health and Clinical NeurosciencesUniversity of NottinghamNottinghamUK Faculty of Medicine The George Institute for Global HealthSydneyNew South WalesAustralia The George Institute China at Peking University Health Science Center BeijingChina Neurology Royal Prince Alfred HospitalSydney Health PartnersSydneyNew South WalesAustralia department of Neurology King's College Hospital NHS Foundation TrustLondonUK Faculty of Health and Medical Sciences University of Western AustraliaCrawleyWestern AustraliaAustralia East Midlands Ambulance Service NHS Trust NottinghamUK Stroke Queen's Medical CentreNottingham University Hospitals NHS TrustNottinghamUK Centre for Clinical Brain Sciences Dementia Research InstituteUniveristy of EdinburghEdinburghUK Institute of Neurology and Psychology University of GlasgowGlasgowUK bob Champion Research and Education Building University of East AngliaNorwichUK Institute of Neuroscience Newcastle UniversityNewcastle upon TyneUK department of Neurology Leeds Teaching Hospitals NHS TrustLeedsUK department of Cardiovascular Sciences and NIHR Leicester Biomedical Research Centre University of LeicesterLeicesterUK Stroke Research in Stoke Institute for Science and Technology in MedicineKeele UniversityStoke-on TrentUK department of Neurology Oslo University HospitalOsloNorway Research and development Norwegian Air Ambulance FoundationOsloNorway department of Neurology and Comprehensive Stroke Center David Geffen School of MedicineUCLALos AngelesCaliforniaUSA Research and Graduate Services University of NottinghamNottinghamUK Community and Health Research Unit University of LincolnLincolnUK

Background The effect of transdermal glyceryl trinitrate(GTN,a nitrovasodilator)on clinical outcome when administered before hospital admission in suspected stroke patients is ***,we assess the safety and efficacy of GTN in the prespecified subgroup of patients who had an ischaemic stroke within the Rapid Intervention with Glyceryl trinitrate in Hypertensive stroke Trial-2(RIGHT-2).Methods RIGHT-2 was an ambulance-based multicentre sham-controlled blinded-endpoint study with patients randomised within 4hours of *** primary outcome was a shift in scores on the modified Rankin scale(mRS)at day *** outcomes included death;a global analysis(wei-Lachin test)containing Barthel Index,EuroQol-5d,mRS,telephone interview for cognitive status-modified and Zung depression scale;and neuroimaging-determined‘brain frailty’*** were reported as n(%),mean(Sd),median[IQR],adjusted common OR(acOR),mean difference or Mann-whitney difference(Mwd)with 95%*** 597 of 1149(52%)patients had a final diagnosis of ischaemic stroke;age 75(12)years,premorbid mRS>2107(18%),Glasgow Coma Scale 14(2)and time from onset to randomisation 67[45,108]***‘brain frailty’was common:median score 2[2,3](range 0–3).At day 90,GTN did not influence the primary outcome(acOR for increased disability 1.15,95%CI 0.85 to 1.54),death or global analysis(Mwd 0.00,95%CI-0.10 to 0.09).In subgroup analyses,there were non-significant interactions suggesting GTN may be associated with more death and dependency in participants randomised within 1hour of symptom onset and in those with more severe *** In patients who had an ischaemic stroke,ultra-acute administration of transdermal GTN in the ambulance did not improve clinical outcomes in a population with more clinical and radiological frailty than seen in previous in-hospital *** IS ALREAdY KNOwN ON THIS TOPIC⇒Transdermal glyceryl trinitrate(GTN)was associat-ed with less death and dependency in those w

关键词： Glasgow nitrate random

Modeling and simulation of microstructure in metallic systems based on multi-physics approaches

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npj Computational Materials 2022年第1期8卷 867-881页

作者： Jaber Rezaei Mianroodi Pratheek Shanthraj Chuanlai Liu Samad Vakili Sharan Roongta Nima Hamidi Siboni Nathan Perchikov Yang Bai bob Svendsen Franz Roters dierk Raabe Martin diehl Microstructure Physics and Alloy design Max-Planck-Institut für Eisenforschung40237DüsseldorfGermany Ergodic Labs Lohmühlenstraße12435BerlinGermany The department of Materials The University of ManchesterManchesterM139PLUK Material Mechanics RWTH Aachen University52062AachenGermany department of Computer Science KU LeuvenCelestijnenlaan 200A3001LeuvenBelgium department of Materials Engineering KU LeuvenKasteelpark Arenberg 443001LeuvenBelgium

The complex interplay between chemistry,microstructure,and behavior of many engineering materials has been investigated predominantly by experimental *** to the increase in computer power,advances in computational modeling methods have resulted in a level of sophistication which is comparable to that of *** the continuum level,one class of such models is based on continuum thermodynamics,phase-field methods,and crystal plasticity,facilitating the account of multiple physical mechanisms (multi-physics) and their interaction during microstructure *** paper reviews the status of simulation approaches and software packages in this field and gives an outlook towards promising research directions.

关键词： computer microstructure metallic

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胶管胶带用硫化剂和防老剂

橡胶工业 2002年第12期49卷 753-760页

作者： Sinha d P Jablonowski Tom Ohm bob Vanis Vern 黄向前 Uniroyal Chemical a Crompton bussiness

越来越高的汽车发动机温度对在汽车中使用的胶管和胶带用聚合物提出了更严格的要求。本文综述了胶管和胶带中使用的聚合物,并针对提高耐热、耐屈挠疲劳和耐臭氧老化性能讨论了每一种聚合物用的硫化体系和防老剂搭配。

关键词：胶管硫化剂防老剂

Mochi: Composing data Services for High-Performance Computing Environments

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Journal of Computer Science & Technology 2020年第1期35卷 121-144页

作者： Robert BRoss George Amvrosiadis Philip Carns Charles dCranor Matthieu dorier Kevin Harms Greg Ganger Garth Gibson Samuel KGutierrez Robert Latham bob Robey dana Robinson Bradley Settlemyer Galen Shipman Shane Snyder Jerome Soumagne Qing Zheng Argonne National Laboratory LemontIL 60439U.S.A Parallel data Laboratory Carnegie Mellon UniversityPittsburghPA 15213U.S.A Vector Institute for Artificial Intelligence TorontoOntarioCanada Los Alamos National Laboratory Los Alamos NMU.S.A The HdF Group Champaign ILU.S.A

Technology enhancements and the growing breadth of application workflows running on high-performance computing(HPC)platforms drive the development of new data services that provide high performance on these new platforms,provide capable and productive interfaces and abstractions for a variety of applications,and are readily adapted when new technologies are *** Mochi framework enables composition of specialized distributed data services from a collection of connectable modules and *** than forcing all applications to use a one-size-fits-all data staging and I/O software configuration,Mochi allows each application to use a data service specialized to its needs and access *** paper introduces the Mochi framework and *** Mochi core components and microservices are *** of the application of the Mochi methodology to the development of four specialized services are ***,a performance evaluation of a Mochi core component,a Mochi microservice,and a composed service providing an object model is *** paper concludes by positioning Mochi relative to related work in the HPC space and indicating directions for future work.

关键词： storage and I/O data-intensive computing distributed services high-performance computing