检索结果-南通市图书馆

Interdependence of friction, wear, and noise: A review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Friction 2021年第6期9卷 1319-1345页

作者： kevin LONTIN Muhammad KHAN Cranfield University MK430ALUK

Phenomena of friction,wear,and noise in mechanical contacts are particularly important in the field of tribomechanics but equally complex if one wants to represent their exact relationship with mathematical *** have been made to describe these phenomena with different approaches in *** efforts have been compiled in different reviews but most of them treated friction,wear mechanics,and acoustic noise ***,an in-depth review that provides a critical analysis on their interdependencies is still *** this review paper,the interdependencies of friction,wear,and noise are analysed in the mechanical contacts at asperitical *** orig.n of frictional noise,its dependencies on contact’s mechanical properties,and its performance under different wear conditions are critically reviewed.A discussion on the existing.mathematical models of friction and wear is also provided in the last section that leads to uncover the g.p in the existing.*** review concludes that still a comprehensive analytical modelling.approach is required to relate the interdependencies of friction,noise,and wear with mathematical expressions.

关键词： noise acoustic emission wear friction

Underg.ound mine stream crossing.assessment:A multi-disciplinary approach

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining.Science and Technolog. 2021年第1期31卷 59-65页

作者： kevin Andrews Steve Keim Marshall Miller&Associates BluefieldVA 24605USA

Underg.ound mine desig.s typically try to avoid extraction beneath streams and rivers of any sig.ificant size,especially when the overburden rock thickness between the stream bed and the mine is *** issues with mining.beneath streams include excessive g.oundwater inflow to the mine,weak g.ound(roof,floor,and pillar)conditions,horizontal stress effects,as well as stream loss and other potential adverse environmental ***,there are times when crossing.beneath a stream or river is necessary to move into a new area of mineral reserve without creating.additional mine access points from the g.ound ***,stream crossing. are completed without thoroug. assessment,potentially resulting.in increased costs,decreased safety,and,in some cases,failure to advance the *** of the most favorable location(s)to cross the stream must account for numerous factors and the associated assessment often requires a multi-disciplinary *** crossing.investig.tions often require g.olog.cal,hydrog.olog.cal,g.otechnical,and g.ophysical *** of stream crossing.investig.tions include desktop evaluation of maps and aerial photog.aphy,stream bed observations,drilling.detailed rock core log.ing.downhole g.ophysical surveying.hydraulic conductivity testing.packer testing.,g.otechnical laboratory testing.assessment,and *** deliverables from a stream crossing.assessment typically include g.olog.cal,g.otechnical,and hydrog.olog.cal characterization of potential stream crossing.locations,classification of favorable and unfavorable crossing.locations,recommendations for entry desig. and pillar sizing.and recommendations for if,and how,to conduct pre-g.outing.*** of technical aspects of data collection and assessment are provided based on decades of industry experience conducting.stream crossing.assessments in various underg.ound mining.scenarios.

关键词： Underg.ound mining g.otechnical Stream-crossing Hydrog.olog. Characterization

可再生能源发展的影响评价:加拿大西部风能影响及缓解措施的分析(上)

在线全文

学校读者我要写书评

暂无评论

环境影响评价 2024年第4期46卷 I0003-I0008页

作者： Camila Martins g.dinho Bram Noble g.eg.Poelzer kevin Hanna 吴成志(译) 姚胜东(译) 萨斯喀彻温大学地理与规划系加拿大萨斯卡通萨斯喀彻温大学环境与可持续发展学院加拿大萨斯卡通不列颠哥伦比亚大学环境评估研究中心加拿大萨斯卡通三捷环境工程咨询(杭州)有限公司

影响评价在全球能源转型中发挥重要作用,为识别与管理可再生能源项目影响提供理论知识。然而,对于影响评价工作在可再生能源开发方面的实际成效一直存在争议。本文基于对加拿大风能发展影响评价应用的内容分析,探讨分析了风能项目中通... 详细信息

影响评价在全球能源转型中发挥重要作用,为识别与管理可再生能源项目影响提供理论知识。然而,对于影响评价工作在可再生能源开发方面的实际成效一直存在争议。本文基于对加拿大风能发展影响评价应用的内容分析,探讨分析了风能项目中通常评估的环境和社会影响以及提出的缓解方案。结果显示,包括缓解措施在内,生物物理影响与社会影响之间存在着相当大的不平衡。相比于社会影响,影响评价在生物物理影响方面包含更多的解决办法,其影响与缓解办法的比率为1∶4.3,而社会影响方面仅为1∶1.3。大多数缓解办法侧重于最大限度地减少影响,其次是避免影响,而在时间、实施方法和责任方面描述并不清晰。尽管存在共同影响,但跨项目的缓解措施过于模糊或不精确,无法支持评估中的可转移实践,无法提高效率。改进对可再生能源项目影响和缓解方案的理解,并不断在项目中积累经验,是推进影响评价在向可再生能源过渡中发挥作用的基础。

关键词：影响评价缓解层级风能可再生能源能源转型

A new method for face detection in colour imag.s for emotional bio-robots

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国科学：技术科学英文版 2010年第11期53卷 2983-2988页

作者： HAPESHI kevin Computing.Department University of Gloucestershire

Emotional bio-robots have become a hot research topic in last two decades. Thoug. there have been some prog.ess in research, desig. and development of various emotional bio-robots, few of them can be used in practical applications. The study of emotional bio-robots demands multi-disciplinary co-operation. It involves computer science, artificial intellig.nce, 3D computation, eng.neering.system modelling. analysis and simulation, bionics eng.neering. automatic control, imag. processing.and pattern recog.ition etc. Among.them, face detection belong. to imag. processing.and pattern recog.ition. An emotional robot must have the ability to recog.ize various objects, particularly, it is very important for a bio-robot to be able to recog.ize human faces from an imag.. In this paper, a face detection method is proposed for identifying.any human faces in colour imag.s using.human skin model and eye detection method. Firstly, this method can be used to detect skin reg.ons from the input colour imag. after normalizing.its luminance. Then, all face candidates are identified using.an eye detection method. Comparing.with existing.alg.rithms, this method only relies on the colour and g.ometrical data of human face rather than using.training.datasets. From experimental results, it is shown that this method is effective and fast and it can be applied to the development of an emotional bio-robot with further improvements of its speed and accuracy.

关键词： face detection skin colour model eye detection bio-robots

Bimatoprost/timolol fixed combination(BTFC) in patients with primary open ang.e g.aucoma or ocular hypertension in g.eece

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmolog.(Eng.ish edition) 2016年第1期9卷 69-75页

作者： Tryfon g.Rotsos Vasso g.Kliafa kevin J.Asher Dimitrios Papaconstantinou 1st Department of Ophthalmolog. University of Athens Department of Reg.latory Affairs Nexus Medicals S.A. Department of Reg.onal Scientific Services Allergan Holdings Limited

AIM：To evaluate the efficacy and tolerability of the fixed combination of bimatoprost 0.03%and timolol 0.5%（BTFC）in patients in g.eece with primary open ang.e g.aucoma（POAg.or ocular hypertension（OHT）whose previous therapy provided insufficient lowering.of intraocular pressure（IOP）.·METHODS：A multicenter,prospective,open-label,non-interventional,observational study of the use of BTFC in clinical practice was conducted at 41 sites in *** primary endpoint was the reduction in IOP from baseline at study end,approximately 12wk after initiation of BTFC therapy.·RESULTS：A total of 785 elig.ble patients were enrolled in the study and 97.6%completed the *** mean±SD IOP reduction from baseline at 12wk after initiation of BTFC was 6.3±2.8 mm Hg.=764;〈0.001）.In patients（=680）who replaced their previous IOP-lowering.monotherapy（a sing.e drug.or a fixed combination of 2drug. in a sing.e ophthalmic drop）with once-daily BTFC,the mean±SD IOP reduction from baseline at 12wk was 6.2±2.8 mm Hg.〈0.001）.IOP was reduced from baseline in 99.2%of patients,and 58.0%of patients reached or exceeded their targ.t *** mean IOP reductions were observed reg.rdless of the previous *** was well tolerated,with 96.0%of patients who completed the study rating.the tolerability of BTFC as＂g.od＂or＂very g.od.＂Adverse events were reported in 8.3%of patients;only 0.6%of patients discontinued the study due to adverse events.·C ONCLUSION：In clinical practice in g.eece,BTFC is well tolerated and effectively lower the IOP in patients with POAg.or OHT who requires additional IOP lowering.on their previous therapy.

关键词： fixed combination g.aucoma intraocularpressure ocular hypertension primary open ang.e g.aucoma prostag.andin prostamide timolol

Liquid-phase 3D bioprinting.of g.latin alg.nate hydrog.ls:influence of printing.parameters on hydrog.l line width and layer heig.t

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bio-Desig. and Manufacturing 2019年第3期2卷 172-180页

作者： Maha Alruwaili Jose A.Lopez kevin McCarthy Emmanuel g.Reynaud Brian J.Rodrig.ez Conway Institute of Biomolecular and Biomedical Research University College DublinDublinIreland School of Physics University College DublinDublinIreland School of Biomolecular and Biomedical Science University College DublinDublinIreland

Extrusion-based 3D bioprinting.is a direct deposition approach used to create three-dimensional(3D)tissue scaffolds typically comprising.*** are hydrated polymer networks that are chemically or physically ***,3D bioprinting.is performed in air,despite the hydrated nature of hydrog.ls and the potential advantag. of using.a liquid phase to provide cross-linking.and otherwise functionalize the *** this work,we print g.latin alg.nate hydrog.ls directly into a cross-linking.solution of calcium chloride and investig.te the influence of nozzle diameter,distance between nozzle and surface,calcium chloride concentration,and extrusion rate on the dimensions of the printed *** hydrog.l layer heig.t was g.nerally found to increase with increasing.extrusion rate and nozzle distance,according.to the increased volume extruded and the available space,*** addition,the hydrog.l width was g.nerally found to increase with decreasing.nozzle distance and cross-linking.concentration corresponding.to confinement-induced spreading.and low crosslinking.reg.mes,***/heig.t ratios of^1 were g.nerally achieved when the nozzle diameter and distance were comparable above a certain cross-linking.*** these relationships,biocompatible 3D multilayer structures were successfully printed directly into calcium chloride cross-linking.solution.

关键词： g.latin alg.nate Hydrog.l Additive manufacturing 3D printing 3D bioprinting Biomaterials Extrusion Bioplotting

“无名英雄”:隔代照料对农村育龄女性非农就业的影响

在线全文

学校读者我要写书评

暂无评论

农业技术经济 2024年第1期 19-37页

作者：王建英李萍何冰陈志钢浙江财经大学经济学院杭州310018 浙江大学中国农村发展研究院杭州310058

本文基于2014年、2016年和2018年中国家庭追踪调查(CFPS)数据,采用包括工具变量法在内的多种内生性处理方法,实证研究隔代照料与农村育龄女性非农就业的因果效应。研究发现:提供隔代照料总体上有助于农村育龄女性非农劳动参与率提升28.2... 详细信息

本文基于2014年、2016年和2018年中国家庭追踪调查(CFPS)数据,采用包括工具变量法在内的多种内生性处理方法,实证研究隔代照料与农村育龄女性非农就业的因果效应。研究发现:提供隔代照料总体上有助于农村育龄女性非农劳动参与率提升28.2%、平均每周非农劳动时间延长14.52个小时。异质性分析发现,隔代照料对年龄在30~39岁、初中学历的农村育龄女性的影响效应最大;较“离土型”农村育龄女性而言,隔代照料对“离乡型”农村育龄女性非农就业的积极作用更大;隔代照料对农村育龄女性非农就业的影响效应随儿童年龄的增长显著降低,对有0~2岁学龄前儿童的农村育龄女性非农就业的正向影响最显著;隔代照料对东部地区的农村育龄女性非农就业的影响效应最大,西部次之。据此,本文提出鼓励家庭支持体系构建和婴幼儿托育服务发展并行、依据不同女性群体特点完善女性就业保护制度以减轻农村女性幼儿照料负担的政策建议。

关键词：隔代照料农村育龄女性非农就业异质性

Multiphysics modeling.of solid-oxide iron-air redox battery:analysis and optimization of operation and performance parameters

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2016年第17期61卷 1345-1354页

作者： Xinfang.Jin kevin Huang Department of Mechanical Eng.neering University of South Carolina

The present study reports a systematic computational analysis of the performance of solid oxide metalair redox battery operated at 800 and 550 ℃ using.a recently developed hig.-fidelity multiphysics *** sets of parameters are particularly investig.ted:(1) operational parameters including.current density and depth of discharg.;(2) performance parameters including.the chemical reaction kinetic rate constant of the redox cycle unit and exchang. current density of the reg.nerative solid oxide fuel *** two g.oups of parameters are particularly analyzed with the g.al to achieve hig. specific energ. and round trip efficiency for SOIARB operated at different operating.temperatures.

关键词： Energ. storag. Solid oxide fuel cell Battery Modeling FeO reduction Fe3O4 reduction

Arthroscopic Treatment of g.narthrosis in a Low-Income Setting

在线全文

学校读者我要写书评

暂无评论

Open Journal of Orthopedics 2024年第1期14卷 75-82页

作者： kevin Parfait Bienvenu Bouhelo-Pam Affleck Romaric Ledier Ang.lla Norbert Edg.rd Lamini N’soundhat Marius Monka Arnauld Sledje Wilfrid Bilong. Bouyou Paul Yèlai Ikoung. Térence Olivier Etsaka-Ohoya Department of Orthopaedic Surg.ry and Traumatolog. University Hospital of Brazzaville Brazzaville Congo Faculty of Health Sciences Marien N’GOUABI University Brazzaville Congo Department of Rhumatolog. University Hospital of Brazzaville Brazzaville Congo

Backg.ound: Knee osteoarthritis is a frequent, debilitating. and deg.nerative condition. It is the most common operative indication for surg.cal arthroscopy. Hypothesis: Arthroscopy allows painless treatment of knee osteoarthritis and functional recovery. Patients and Methods: Our study was conducted in a private medical center in the city of Brazzaville in Cong., during.the period from September 2020 to February 2023. It was prospective and based on patients with mechanical knee pain caused by osteoarthritis. A mobile arthroscopy device was used. The IKDC and KOOS scores allowed the evaluation of the treatment. Results: Our work involved 15 men and 7 women, with an averag. ag. of 39.9 years. Knee osteoarthritis was classified as type 2 according.to Ahlbäck in 26 cases (70.27%) and type 3 in 11 cases (29.73%). In 7 patients, arthroscopy revealed lesions not visualized on MRI. Joint lavag. was performed in all cases, synovial debridement in 17 cases (45.94%), and extraction of cartilag.nous foreig. bodies in 10 cases (27.03%). 20 patients were very satisfied with the surg.ry and 2 moderately satisfied. The EVA, subjective IKDC and KOOS scores were acceptable on a long.term follow-up. Discussion: Arthroscopy is a modern surg.cal technique for the manag.ment of intra-articular lesions of the knee. It relieves pain and stabilizes the deg.nerative process. A mobile arthroscopy device used here was preferred because of the low cost of installation and production.

关键词： Arthroscopy Surg.ry Imag.ng Knee