检索结果-南通市图书馆

Chemical-assisted MMP reduction on methane-oil systems:Implications for natural gas injection to enhanced oil recovery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum 2024年第1期10卷 101-108页

作者： Mohamed Almobarak matthew B.Myers Colin D.Wood Yongbing Liu Ali Saeedi Quan Xie Discipline of Petroleum Engineering WA School of Mines: Minerals Energy and Chemical Engineering Curtin University Commonwealth Scientific and Industrial Research Organization Curtin University Oil and Gas Innovation Centre Management State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation

Miscible natural gas injection is widely considered as a practical and efficient enhanced oil recovery technique. However, the main challenge in this process is the high minimum miscibility pressure（MMP）between natural gas and crude oil, which limits its application and recovery factor, especially in hightemperature reservoirs. Therefore, we present a novel investigation to quantify the effect of chemicalassisted MMP reduction on the oil recovery factor. Firstly, we measured the interfacial tension（IFT） of the methane-oil system in the presence of chemical or CO2to calculate the MMP reduction at a constant temperature（373K） using the vanishing interfacial tension（VIT） method. Afterwards, we performed three coreflooding experiments to quantify the effect of MMP reduction on the oil recovery factor under different injection *** interfacial tension measurements show that adding a small fraction（1.5 wt%） of the tested surfactant（SOLOTERRA ME-6） achieved 9% of MMP reduction, while adding 20 wt% of CO2to the methane yields 13% of MMP reduction. Then, the coreflooding results highlight the significance of achieving miscibility during gas injection, as the ultimate recovery factor increased from 65.5% under immiscible conditions to 77.2% using chemical-assisted methane, and to 79% using gas mixture after achieving near miscible condition. The results demonstrate the promising potential of the MMP reduction to significantly increase the oil recovery factor during gas injection. Furthermore, these results will likely expand the application envelop of the miscible gas injection, in addition to the environmental benefits of utilizing the produced gas by re-injection/recycling instead of flaring which contributes to reducing the greenhouse gas emissions.

关键词： Gas injection Enhanced oil recovery Miscibility Coreflooding

Life under tension: the relevance of force on biological polymers

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Biophysics Reports 2024年第1期10卷 48-56页

作者： matthew T.J.Halma Longfu Xu Department of Physics and Astronomy and Laser Lab Vrije Universiteit Amsterdam LUMICKS B.V.

Optical tweezers have elucidated numerous biological processes, particularly by enabling the precise manipulation and measurement of tension. One question concerns the biological relevance of these experiments and the generalizability of these experiments to wider biological systems. Here, we categorize the applicability of the information garnered from optical tweezers in two distinct categories: the direct relevance of tension in biological systems, and what experiments under tension can tell us about biological systems, while these systems do not reach the same tension as the experiment, still, these artificial experimental systems reveal insights into the operations of biological machines and life processes.

关键词： Tension Optical tweezers Molecular force

Will artificial intelligence widen the therapeutic gap between children and adults?

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Pediatric Investigation 2024年第1期8卷 1-6页

作者： matthew Nagy Bryan Sisk Albert Lai Eric Kodish Cleveland Clinic Lerner College of Medicine Case Western Reserve UniversityClevelandOhioUSA Department of Pediatrics Division of Hematology/OncologyWashington University School of MedicineSt.LouisMissouriUSA Department of Medicine Bioethics Research CenterWashington University School of MedicineSt.LouisMissouriUSA Institute for Informatics Washington University School of MedicineSt.LouisMissouriUSA Department of Pediatric Hematology Oncology and Blood and Marrow Transplantation Cleveland Clinic Children’sClevelandOhioUSA

The impending rise of artificial intelligence(AI)-powered healthcare offers exciting hope for improved care and outcomes in children with serious illnesses.1 The historical precedent in healthcare,however,suggests that advancements in adult care do not necessarily result in proportional progress in *** disparity was first noted in the mid-20th century when tragedies that involved drugs with well-studied and known adult safety profiles,such as sulfonamide elixir and thalidomide,resulted in harm to children due to limited pediatric clinical trial inclusion.2 As a result,legislation in 1962 required drug companies to include package labels that restricted or dissuaded the use of medications in children that were not properly studied in this population.2 Subsequently,physicians became reluctant to prescribe many medications,and pharmaceutical companies had little incentive to enroll children in trials as an unfavorable result could negatively impact sales in the adult market,and a successful outcome would only marginally increase the market pool.3 This lack of access led *** Shirkey to describe children as"therapeutic orphans"in 1968.2 After more than half a century of legislation aimed at increasing pediatric representation in research and drug development(Figure 1),enrollment of children in clinical trials remains disproportionately low,4 with children included in as few as 12%of trials for diseases with a burden equal to,or greater in,the pediatric versus adult population.

关键词： companies Figure properly

维普期刊数据库

基于系统动力学的北京自动驾驶汽车市场发展研究

在线全文

学校读者我要写书评

暂无评论

系统科学与数学 2024年

作者：徐猛毛玮 SHEPHERD Simon harrison Gillian 北京交通大学系统科学学院利兹大学交通研究所

本文从自动驾驶汽车市场发展角度,围绕私人汽车与共享自动驾驶汽车的市场发展特征进行动力学分析.结合自动驾驶技术发展现状,通过选取居民对自动驾驶技术信任度、购买意愿、使用意愿以及共享自动驾驶汽车服务可达性等指标衡量自动驾驶... 详细信息

本文从自动驾驶汽车市场发展角度,围绕私人汽车与共享自动驾驶汽车的市场发展特征进行动力学分析.结合自动驾驶技术发展现状,通过选取居民对自动驾驶技术信任度、购买意愿、使用意愿以及共享自动驾驶汽车服务可达性等指标衡量自动驾驶汽车市场发展,提出自动驾驶汽车市场发展系统动力学模型.以北京为例,分析其从2014年至2050年的汽车市场发展情况,以及在2024年至2050年自动驾驶汽车的数量变化情况,并估计自动驾驶汽车的市场份额.结果表明:自动驾驶汽车数量将在2040年超过传统汽车;预计到2050年,自动驾驶汽车市场份额将超过90%.进一步地,构建自动化驾驶技术发展、共享自动驾驶汽车推广等发展方案,对自动驾驶汽车应用场景进行拓展建模分析.结果显示:自动驾驶技术快速发展,将会吸引更多居民使用私人自动驾驶汽车;推广共享自动驾驶汽车,能够有效减少未来私人自动驾驶汽车的购买量.本研究为未来城市自动驾驶汽车发展提供了参考.

关键词：城市交通市场份额系统动力学自动驾驶汽车共享自动驾驶汽车汽车市场发展

Etiology and management of urethral calculi:A systematic review of contemporary series

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Urology 2024年第1期11卷 10-18页

作者： Andrew Morton Arsalan Tariq Nigel Dunglison Rachel Esler matthew J.Roberts Faculty of Medicine The University of QueenslandBrisbaneQueenslandAustralia Department of Urology Ipswich HospitalQueenslandAustralia Department of Urology Royal Brisbane and Women's HospitalQueenslandAustralia The University of Queensland Centre for Clinical Research HerstonAustralia

Objective:To conduct a systematic literature review on urethral calculi in a contemporary cohort describing etiology,investigation,and management ***:A systematic search of MEDLINE and Cochrane Central Register of Controlled Trials(CENTRAL)databases was ***,including case reports and case series on urethral calculi published between January 2000 and December 2019,were ***-text manuscripts were reviewed for clinical parameters including symptomatology,etiology,medical history,investigations,treatment,and *** were collated and analyzed with univariate ***:Seventy-four publications met inclusion criteria,reporting on 95 *** symptoms(41.1%),pain(40.0%),and acute urinary retention(32.6%)were common presenting *** calculi were most often initially investigated using plain X-ray(63.2%),with almost all radio-opaque(98.3%).Urethral calculi were frequently associated with coexistent bladder or upper urinary tract calculi(16.8%)and underlying urethral pathology(53.7%)including diverticulum(33.7%)or stricture(13.7%).Urethral calculi were most commonly managed with external urethrolithotomy(31.6%),retrograde manipulation(22.1%),and endoscopic in situ lithotripsy(17.9%).Conclusion:This unique systematic review of urethral calculi provided a summary of clinical features and treatment trends with a suggested treatment *** in contemporary urological practice should be according to calculus size,shape,anatomical location,and presence of urethral pathology.

关键词： Urinary calculi Urethra Urethral calculi Management algorithm

Integrated Stratigraphy and Mineralogy of the Doushantuo Formation in Weng’an,South China,and Implications for Ediacaran Phosphogenesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年第2期35卷 476-503页

作者： Liangxuan Jiao Zhenbing She Dominic Papineau Yaguan Zhang matthew S.Dodd Kenan Cao Qun Chen Guoyong Chen State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan430078China School of Earth Sciences China University of GeosciencesWuhan430047China London Centre for Nanotechnology University College London17-19 Gordon StreetLondonWC1E 6BTUK Department of Earth Sciences University College LondonLondonWC1E 6BTUK Centre for Planetary Science University College London and Birkbeck CollegeLondonWC1E 7HXUK Innovation Center of Ore Resources Exploration Technology in the Region of Bedrock Ministry of Natural Resources of People’s Republic of China’Guiyang550000China Guizhou Bureau of Geology and Mineral Exploration and Development Guiyang550000China

The Ediacaran–Cambrian Phosphogenic Episode is the Earth’s first true phosphogenic event and resulted in worldwide phosphate deposits,which occurred during the processes of the Neoproterozoic Oxygenation *** Ediacaran Doushantuo Formation(ca.635–551 Ma)of Weng’an area in central Guizhou,South China,contains two economic phosphorite beds(the Lower and Upper Phosphorite Beds).This paper presents a detailed stratigraphic,sedimentological and mineralogical study of multiple outcrop and drill core sections of the Doushantuo Formation across the Weng’an area,and identified 11 lithofacies and 4 types of phosphatic *** differences in lithofacies and grain types between the upper and lower phosphate deposits are observed,indicating that the two sets of phosphate deposits are the products of two distinct phosphogenic *** Lower Phosphorite Bed mainly consists of banded and laminated phosphorites,contains micro-oncoids formed by microbially-mediated precipitation and peloids formed by in-situ chemically oscillating reactions,indicating a biochemical and chemical enrichment of phosphorus to sediments during the Early Ediacaran *** Upper Phosphorite Bed is mainly composed of carbonaceous,massive,and stromatolitic phosphorites,contains bioclasts(phosphatized spheroidal fossils),and intraclasts formed by hydrodynamic agitation,suggesting that the major accesses of phosphorus to sediments were the remineralization of organic *** of the two economic phosphorite beds was controlled by two sea-level *** differences have also been documented in contemporaneous phosphate-bearing successions in Brazil and Mangolia,indicating a significant shift in global phosphogenic mechanism during the early and middle Ediacaran,which may be due to the changes in redox conditions in seawater,associated with the Neoproterozoic Oxygenation *** regional active P-cycle processes could produce more free oxygen,which may have contributed to the up

关键词： phosphorite lithofacies phosphatic grains phosphogenic paragenesis phosphorus cycle mineralogy

维普期刊数据库

Efficiency of a Modular Cleanroom for Space Applications

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2024年第3期20卷 547-562页

作者： matthew R.Coburn Charlie Young Chris Smith Graham Schultz Miguel Robayo Zheng-Tong Xie Faculty of Engineering and Physical Sciences University of SouthamptonSouthamptonSO171BJUK Plastron UK Ltd. Westcott Venture ParkWestcottHP180XBUK Renewable Energy Group University of ExeterExeterTR109FEUK

A prototype cleanroom for hazardous testing and handling of satellites prior to launcher encapsulation,satisfying the ISO8 standard has been designed and analyzed in terms of *** Reynolds Averaged Navier-Stokes(URANS)models have been used to study the related flow field and particulate matter(PM)*** outcomes of the URANS models have been validated through comparison with equivalent large-eddy *** attention has been paid to the location and shape of the air intakes and their orientation in space,in order to balance the PM convection and diffusion inside the *** a cyclone-type flow pattern inside the cleanroom is a key to maintaining a high ventilation efficiency.

关键词： Diffuser LES PM RANS unsteady flow exponential decay

A review of complications after ureteral reconstruction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Urology 2024年第3期11卷 348-356页

作者： Jonathan Rosenfeld Devin Boehm Aidan Raikar Devyn Coskey matthew Lee Emily Ji Ziho Lee Department of Urology Northwestern UniversityFeinberg School of MedicineChicagoILUSA Department of Urology Temple UniversityLewis Katz School of MedicinePhiladelphiaPAUSA

Objective:This study aimed to provide a comprehensive overview of the complications unique to ureteral reconstruction in adults,emphasizing their presentation,diagnosis,and management in the treatment of ureteral structure ***:This review involves an in-depth analysis of existing literature and case studies pertaining to ureteral reconstruction,with a focus on examining the range of complications that can arise *** attention is given to the presentation of each complication,the diagnostic process involved,and the subsequent management ***:Ureteral reconstruction can treat ureteral stricture disease with low morbidity;however,complications,although uncommon,can have severe *** most notable complications include urinary extravasation,stricture recurrence,urinary tract infections,compartment syndrome,symptomatic vesicoureteral reflux,and Boari flap *** complication presents unique diagnostic challenges and requires specific management ***:Ureteral reconstruction is a highly effective treatment for ureteral stricture *** a strong understanding of the potential complications that patients may experience following ureteral reconstruction is not only critical to adequately counsel patients but also facilitate prompt diagnosis and management of complications when they arise.

关键词： Ureteral reconstruction Postoperative complication Urinary extravasation Stricturerecurrence Urinary tract infection

The Economics of Competing Water Uses under a FERC Licensing Agreement: Estimation of Property Value, Recreation, and Hydroelectric Impacts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2024年第6期16卷 414-428页

作者： matthew Bingham Jason Kinnell Veritas Economics Cary USA

Reservoirs provide a variety of services with economic values across multiple sectors. As demands for reservoir services continue to grow and precipitation patterns evolve, it becomes ever more important to consider the integrated suite of values and tradeoffs that attend changes in water uses and availability. Section 316 (b) of the Clean Water Act requires that owners of certain water cooled power plants evaluate technologies and operational measures that can reduce their impacts to aquatic organisms. The studies must discuss the social costs and benefits of alternative technologies including cooling towers (79 Fed. Reg. 158, 48300 - 48439). Cooling towers achieve their effect through evaporation. This manuscript estimates the property value, recreation, and hydroelectric generation impacts that could result from the evaporative water loss associated with installing cooling towers at the McGuire Nuclear Generating Station (McGuire) located on Lake Norman, North Carolina. Although this study specifically evaluates the effects of evaporative water loss from cooling towers, its methods are applicable to estimating the economic benefits and costs of a new water user or reduced water input in any complex reservoir system that supports steam electric generation, hydroelectric generation, residential properties, recreation, irrigation, and municipal water use.

关键词： Property Value FERC Hydroelectric Recreation Water Levels