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Tribological evaluation of thermoplastic polyurethane-based bearing materials under water lubrication:Effect of load,sliding speed,and temperature

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Friction 2024年第8期12卷 1801-1815页

作者： Shaoli JIANG janet SSWONG Debashis PUHAN Tian YUAN Xiuqin BAI Chengqing YUAN State Key Laboratory of Maritime Technology and Safety Wuhan University of TechnologyWuhan 430063China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK Yusuf Hamied Department of Chemistry University of CambridgeLensfield RoadCambridge CB21EWUK

Polymers are widely used in bearing *** the case of water-lubricated stern tube bearings,thermoplastic polyurethane(TPU)-based composites are used due to their excellent wear resistance,corrosion resistance,and tunable mechanical *** tribological performance,however,depends on operating *** this work,TPU was blended with carbon fiber,graphene platelet,and ultra-high molecular weight polyethylene(UHMWPE).Friction tests of TPU based-composites against copper countersurface were carried out in water to mimic the actual operating conditions of the *** of the resulting contacts were in the boundary lubrication regime,in which friction was attributed to both contact mechanics of asperities as well as water *** results show that the viscoelasticity of TPU has a considerable impact on its tribological *** lubrication at 50°C promotes the softening of polymer surface material during sliding,resulting in higher fluctuation in the coefficient of friction and wear *** is attributed to the reduced thermomechanical *** addition,Schallamach waviness is observed on worn *** tribological properties of TPU are significantly improved by the inclusion of carbon fiber,graphene platelet,and *** formation of graphene transfer-layers and UHMWPE transfer film reduces friction and wear loss,while the inclusion of carbon fiber enhances wear resistance due to improved mechanical properties and load bearing capacity.

关键词： friction thermoplastic polyurethane(TPU) water-lubricated bearings graphene platelet carbon fibers ultra-high molecular weight polyethylene(UHMWPE)

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Enhanced but hypofunctional osteoclastogenesis in an autosomal dominant osteopetrosis type II case carrying a c.1856C＞T mutation in CLCN7

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Bone Research 2016年第4期4卷 232-240页

作者： Xiang Chen Kun Zhang janet Hock Chunyu Wang Xijie Yu Laboratory of Endocrinology and Metabolism Department of Endocrinology State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu China The Polis Center Indiana University-Purdue University Indianapolis Indianapolis IN USA

Type II autosomal dominant osteopetrosis(ADO2), which is the most common form of osteopetrosis, is caused by heterozygous mutations in the chloride channel 7(CLCN7) gene. The osteopetrosis of ADO2 has been attributed to hypofunctional osteoclasts. The mechanism underlying the abnormality in osteoclast function remains largely unknown. This study was designed to investigate gene mutations and osteoclast function in a case that was clinically diagnosed as ADO2. Genomic DNA was extracted from blood samples of this patient, and the 25 exons of CLCN7 were amplified. Peripheral blood from the ADO2 subject and a healthy age- and sex-matched control was used to evaluate osteoclastogenesis, osteoclast morphology, and bone resorption. Analysis of DNA from the patient showed a germline heterozygous missense mutation,c.1856C>T(p.P619L), in exon 20 of CLCN7. A similar homozygous mutation at this site was previously reported in a patient with autosomal recessive osteopetrosis. When cultured, the peripheral blood mononuclear cells(PBMCs) from the ADO2 patient spontaneously differentiated into mature osteoclasts in vitro. The ADO2 patient’s PBMCs formed enhanced, but heterogeneous, osteoclasts in both the presence and absence of macrophage-colony stimulating factor, and nuclear factor-?B ligand. Bone resorption was reduced in the ADO2 patient’s osteoclasts, which exhibited aberrant morphology and abnormal distribution of integrin avβ3. Gene analysis found increased c-fos expression and reduced Rho A and integrin beta 3expression in ADO2 cells. In conclusion, our data suggest that enhanced, heterogeneous osteoclast induction may be an intrinsic characteristic of ADO2.

关键词： ADO T mutation in CLCN7 Enhanced but hypofunctional osteoclastogenesis in an autosomal dominant osteopetrosis type II case carrying a c.1856C case type II

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全球经济的驱动力——专访汇丰银行经济学家janet Henry女士和James Pomeroy先生

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中国货币市场 2017年第4期 35-40页

作者： janet Henry James Pomeroy 《中国货币市场》杂志社汇丰银行

近期，全球经济周期性复苏表现出近年来难得一见的同步性：发达经济体经济增长好转，新兴市场经济体紧随其后，而最大的经济提升则出现在整个欧洲。全球经济的这种复苏是否可持续？经济增长的驱动力来自于哪里？

关键词：经济学家全球经济驱动力 James 汇丰银行新兴市场经济体专访女士

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Status of precision medicine approaches to traumatic brain injury

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Neural Regeneration Research 2022年第10期17卷 2166-2171页

作者： Sahithi Reddi Smita Thakker-Varia janet Alder Anna O.Giarratana Department of Neuroscience and Cell Biology Rutgers Robert Wood Johnson Medical SchoolPiscatawayNJUSA

Traumatic brain injury(TBI)is a serious condition in which trauma to the head causes damage to the brain,leading to a disruption in brain *** is a significant health issue worldwide,with around 69 million people suffering from TBI each *** following the trauma,damage occurs in the acute phase of injury that leads to the primary outcomes of the *** the hours-to-days that follow,secondary damage can also occur,leading to chronic *** can range in severity from mild to severe,and can be complicated by the fact that some individuals sustain multiple TBIs,a risk factor for worse long-term *** our knowledge about the pathophysiology of TBI has increased in recent years,unfortunately this has not been translated into effective clinical *** *** and Drug Administration has yet to approve any drugs for the treatment of TBI;current clinical treatment guidelines merely offer supportive *** between individuals greatly vary,which makes the treatment for TBI so challenging.A blow of similar force can have only mild,primary outcomes in one individual and yet cause severe,chronic outcomes in *** of the reasons that have been proposed for this differential response to TBI is the underlying genetic differences across the *** to this,many researchers have begun to investigate the possibility of using precision medicine techniques to address TBI *** this review,we will discuss the research detailing the identification of genetic risk factors for worse outcomes after TBI,and the work investigating personalized treatments for these higher-risk *** highlight the need for further research into the identification of higher-risk individuals and the development of personalized therapies for TBI.

关键词： apolipoprotein E biomarkers brain injury brain-derived neurotrophic factor clinical trials personalized treatments precision medicine tau translational research traumatic brain injury

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基于信息熵的制造系统复杂性测度及其在调度中的应用

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机械工程学报 2006年第7期42卷 8-13页

作者：饶运清 EFSTATHIOU janet 华中科技大学机械科学与工程学院武汉430074 牛津大学工程科学系

制造系统的复杂性是指制造系统难以被理解、描述、预测和控制的状态。从信息论角度指出制造系统的复杂度是描述制造系统的状态所预期需要的信息量。将制造系统的复杂性描述为静态和动态两种形式:静态复杂性是描述制造系统在静止状态下... 详细信息

制造系统的复杂性是指制造系统难以被理解、描述、预测和控制的状态。从信息论角度指出制造系统的复杂度是描述制造系统的状态所预期需要的信息量。将制造系统的复杂性描述为静态和动态两种形式:静态复杂性是描述制造系统在静止状态下各制造资源根据其调度方案所预期拥有的状态所需要的信息量,动态复杂性则指描述制造系统在运行过程中各资源的实际状态所需要的信息量。应用信息论中的信息熵理论研究制造系统的复杂性测度问题,分别建立了基于信息熵的静态和动态复杂性测度模型。将上述复杂性理论应用于调度研究,提出最大可行调度时限和调度依附度两个评价调度有效性的量化指标,为调度有效性的分析、评价及改善提供了重要工具。实例研究表明所提理论和方法的有效性。

关键词：制造系统复杂性信息熵调度调度有效性

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The economics book

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作者： Mohun janet.

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Productive performance of commercial growing and finishing pigs supplemented with a Buttiauxella phytase as a total replacement of inorganic phosphate

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Animal Nutrition 2018年第4期4卷 351-357页

作者： Yueming Dersjant-Li Peter Plumstead Ajay Awati janet Remus Danisco Animal Nutrition DuPont Industrial Biosciences Marlborough SN8 1XN United Kingdom Department of Animal and Wildlife Sciences Faculty of Agricultural and Natural Sciences University of Pretoria Hatfield Pretoria 0028 South Africa Danisco Animal Nutrition DuPont Industrial Biosciences St. Louis MO 63167 USA

The objective of this study was to test if a novel phytase from Buttiauxella sp. can replace all added inorganic phosphate in a diet with reduced Ca and metabolizable energy(ME) fed to commercial pigs from12 kg body weight(BW) until slaughter, whilst maintaining performance and carcass quality *** dietary treatments were tested in a completely randomized design with 9 replicate pens, each containing 31 mixed sex Newsham Choice pigs. Diets included a positive control(PC) based on corn,soybean meal, wheat middling and bakery meal, meeting all nutrient requirement of pigs; a negative control(NC) excluded inorganic phosphate and with reduced Ca(-0.13%) and ME(-0.15 MJ/kg); and NC supplemented with Buttiauxella phytase at 500 or 1,000 FTU/kg feed. Diets were fed ad libitum in mash form in 5 phases: starter(12 to 25 kg BW), grower 1(25 to 50 kg BW) and 2(50 to 75 kg BW), and finisher1(75 to 100 kg BW) and 2(100 kg BW to slaughter). The NC group showed lower(P < 0.05) average daily feed intake(ADFI) and average daily gain(ADG) in starter and grower phases, lower gain to feed ratio(G:F)in starter and grower 1 compared with PC. Pigs receiving the high dose of phytase of 1,000 FTU/kg had improved performance vs. the 500 FTU/kg phytase treatment in starter and grower 1 phase compared with the PC in grower 1 phase. Increasing phytase dose resulted in a linear increase in ADG(12 to120 kg BW) and G:F(50 to 75 kg BW). A comparison of treatment groups over the full production period from 12 kg BW until slaughter showed that both 500 and 1,000 FTU/kg phytase treatments were able to maintain growth performance and carcass characteristics compared with PC. The application of Buttiauxella phytase could therefore be used as an effective strategy to replace all inorganic phosphate in diets of pigs fed corn, soybean meal, wheat middling and bakery meal based diets from 12 kg BW. An economic analysis showed greater return from both phytase treatments vs. the PC and favored the

关键词： Buttiauxella phytase Carcass Pigs Phosphorus Productive performance

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Computational Investigation of the Effects of Sample Geometry on the Superconducting-Normal Phase Boundary and Vortex-Antivortex States in Mesoscopic Superconductors

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Communications in Computational Physics 2009年第9期6卷 673-698页

作者： Sangbum Kim Max Gunzburger janet Peterson Chia-Ren Hu Division of Energy Systems Research Ajou UniversitySuwon 442-749Korea Department of Scientific Computing Florida State UniversityTallahasseeFL 32309-4120USA Center for Theoretical Physics Department of PhysicsTexas A&M UniversityCollege StationTexas 77843USA

A computational study of superconducting states near the superconductingnormal phase boundary in mesoscopic finite cylinders is *** computational approach uses a finite element method to find numerical solutions of the linearized Ginzburg-Landau equation for samples with various sizes,aspect ratios,and crosssectional shapes,i.e.,squares,triangles,circles,pentagons,and four star *** vector potential is determined using a finite element method with two penalty terms to enforce the gauge conditions that the vector potential is solenoidal and its normal component vanishes at the surface(s)of the *** eigenvalue problem for the linearized Ginzburg-Landau equations with homogeneous Neumann boundary conditions is solved and used to construct the superconducting-normal phase boundary for each ***-antivortex(V-AV)configurations for each sample that accurately reflect the discrete symmetry of each sample boundary were found through the computational *** V-AV configurations are realized just within the phase boundary in the magnetic field-temperature phase *** are made between the results obtained for the different sample shapes.

关键词： Superconductivity nucleation symmetry finite element method

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Surface inflow into the South China Sea through the Luzon Strait in winter

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Chinese Journal of Oceanology and Limnology 2012年第1期30卷 163-168页

作者： GUO Jingsong CHEN Xianyao janet SPRINTALL GUO Binghuo QIAO Fangli YUAN Yeli Physical and Environmental Oceanography Ocean University of ChinaQingdao 266100China Laboratory of Marine Science and Numerical Modeling The First Institute of OceanographyState Oceanic AdministrationQingdao 266061China Scripps Institution of Oceanography UCSDCaliforniaUnited States

We studied the driving force of the Kuroshio intrusion into the South China Sea （SCS） during the winter monsoon, using satellite-tracked drifters entering the Luzon Strait （LS） through the Balintany and Babuyan Channels from the Philippine Sea. Most drifters passing through the Babuyan Channel in winter entered the interior SCS without a significant change in velocity. However, half of the drifters passing through the Balintany Channel entered the SCS at -30 cn/s, which was faster than when they entered the LS. The other half continued moving northwestward into the Kuroshio and returned to the North Pacific. Quantitative analyses, using surface climatological wind and sea surface height anomaly （SSHa） data explained both the difference in velocity of drifters between the two channels and their acceleration through the Balintany Channel. The results suggest that the positive meridional gradient of sea surface height in the Luzon Strait, caused by the pileup of seawater driven by the Northeast monsoon, as well as Ekman flow, contribute to the Kuroshio intrusion into the SCS through the Babuyan and Balintany Channels. The former may be the main driving force.

关键词： Kuroshio intrusion South China Sea (SCS) monsoonal winds sea surface height

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Advanced concepts in knee arthrodesis

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World Journal of Orthopedics 2015年第2期6卷 202-210页

作者： Jennifer H Wood janet D Conway Department of Orthopaedics University of Maryland School of Medicine University of Maryland Medical System International Center for Limb Lengthening Rubin Institute for Advanced OrthopedicsSinai Hospital of Baltimore

The aim is to describe advanced strategies that can beused to diagnose and treat complications after knee arthrodesis and to describe temporary knee arthrodesis to treat infected knee arthroplasty. Potential difficult complications include nonunited knee arthrodesis, limb length discrepancy after knee arthrodesis, and united but infected knee arthrodesis. If a nonunited knee arthrodesis shows evidence of implant loosening or failure, then bone grafting the nonunion site as well as exchange intramedullary nailing and/or supplemental plate fixation are recommended. If symptomatic limb length discrepancy cannot be satisfactorily treated with a shoe lift, then the patient should undergo tibial lengthening over nail with a monolateral fixator or exchange nailing with a femoral internal lengthening device. If a united knee arthrodesis is infected, the nail must be removed. Then the surgeon has the option of replacing it with a long, antibiotic cement-coated nail. The authors also describe temporary knee arthrodesis for infected knee arthroplasty in patients who have the potential to undergo insertion of a new implant. The procedure has two goals: eradication of infection and stabilization of the knee. A temporary knee fusion can be accomplished by inserting both an antibiotic cement-coated knee fusion nail and a static antibiotic cement-coated spacer. These advanced techniques can be helpful when treating difficult complications after knee arthrodesis and treating cases of infected knee arthroplasty.

关键词： Arthroplasty Knee Arthrodesis Nonunion Limb salvage Limb length inequality Infection Osteomyelitis Bone lengthening External fixator

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