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铜铁合金的制备方法及相结构调控研究进展

材料热处理学报 2024年第8期45卷 1-12页

作者：李小军项燕龙向朝建巢国辉于翔宇龚深娄花芬李周中南大学材料科学与工程学院湖南长沙410083 宁波金田铜业(集团)股份有限公司浙江宁波315304 中铝科学技术研究院有限公司北京102209 中南大学粉末冶金国家重点实验室湖南长沙410083

Cu-Fe合金充分发挥了铜和铁元素的优势,具有良好的强度、导电性和电磁屏蔽性能,广泛应用于电力、电子通讯、建筑和海洋船舶等领域。然而,Cu-Fe合金在熔炼时存在的亚稳液相分离问题,阻碍了其大规模应用。面对日益增长的对高强高导兼具电... 详细信息

Cu-Fe合金充分发挥了铜和铁元素的优势,具有良好的强度、导电性和电磁屏蔽性能,广泛应用于电力、电子通讯、建筑和海洋船舶等领域。然而,Cu-Fe合金在熔炼时存在的亚稳液相分离问题,阻碍了其大规模应用。面对日益增长的对高强高导兼具电磁屏蔽性能合金的应用需求,必须对合金的制备方法、成分筛选和加工工艺进行更深入地研究。本文从Cu-Fe合金的制备方法、合金化元素对合金相结构的调控以及加工工艺对合金性能的影响等方面入手,对目前Cu-Fe合金的发展现状进行了总结。最后分析了目前Cu-Fe合金发展存在的挑战,并展望了其未来的研究方向。

关键词： Cu-Fe合金制备方法相结构调控研究进展

Sustainable green technology on wastewater treatment:The evaluation of enhanced single chambered up-flow membrane-less microbial fuel cell

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Journal of Environmental Sciences 2018年第4期30卷 295-300页

作者： Wei-eng Thung Soon-An ong Li-Ngee Ho Yee-Shian Wong Fahmi Ridwan Yoong-Ling Oon Yoong-Sin Oon Harvinder Kaur Lehl Water Research Group (WAREG) School of Environmental Engineering Universiti Malaysia Perlis School of Materials engineering Universiti Malaysia Perlis

This study demonstrated the potential of single chamber up-flow membrane-less microbial fuel cell（UFML-MFC） in wastewater treatment and power generation. The purpose of this study was to evaluate and enhance the performance under different operational conditions which affect the chemical oxygen demand（COD） reduction and power generation,including the increase of KCl concentration（MFC1） and COD concentration（MFC2）. The results showed that the increase of KCl concentration is an important factor in up-flow membrane-less MFC to enhance the ease of electron transfer from anode to cathode. The increase of COD concentration in MFC2 could led to the drop of voltage output due to the prompt of biofilm growth in MFC2 cathode which could increase the internal resistance. It also showed that the COD concentration is a vital issue in up-flow membrane-less *** the COD reduction was up to 96%, the power output remained constrained.

关键词： MFC Up-flow Membrane-less KCl concentration COD Ionic strength Biocathode Biofilm

Emergency medical services use and its association with acute ischaemic stroke evaluation and treatment in Singapore

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Stroke & Vascular Neurology 2020年第2期5卷 121-127页

作者： Hanzhang Xu Ying Xian Fung Peng Woon Janet Prvu Bettger Daniel T Laskowitz Yih Yng Ng Marcus eng Hock ong david Bruce Matchar Deidre Anne De Silva Department of Family Medicine and Community Health Duke University School of MedicineDurhamNorth CarolinaUnited States Duke University School of Nursing DurhamNorth CarolinaUnited States Duke Clinical Research Institute DurhamNorth CarolinaUnited States Department of Neurology Duke University School of MedicineDurhamNorth CarolinaUnited States Department of Neurology National Neuroscience Institute-Singapore General Hospital CampusSingapore Department of Orthopaedic Surgery Duke University School of MedicineDurhamNorth CarolinaUnited States HomeTeam Government of Singapore Ministry of Home AffairsSingapore Department of Emergency Medicine Singapore General HospitalSingapore Program in Health Services and Systems Research Duke-NUS Graduate Medical SchoolSingapore Department of Medicine(General Internal Medicine) Duke University School of MedicineDurhamNorth CarolinaUnited States

Background Emergency medical services(EMS)is a critical link in the chain of stroke *** aimed to assess EMS use for stroke in Singapore,identify characteristics associated with EMS use and the association of EMS use with stroke evaluation and *** The Singapore Stroke Registry combines nationwide EMS and public hospital data for stroke cases in *** regressions with the generalised estimating equations were performed to examine the association between EMS use and timely stroke evaluation and *** Of 3555 acute ischaemic patients with symptom onset within 24 hours admitted to all five public hospitals between 2015 and 2016,68%arrived via *** who used EMS were older,were less likely to be female,had higher stroke severity by National Institute of Health Stroke Scale and had a higher prevalence of atrial fibrillation or peripheral arterial *** transported by EMS were more likely to receive rapid evaluation(door-to imaging time≤25 min 34.3%vs 11.1%,OR=2.74(95%CI 1.40 to 5.38))and were more likely to receive intravenous tissue plasminogen activator(tPA,22.8%vs 4.6%,OR=4.61(95%CI 3.52 to 6.03)).Among patients treated with tPA,patients who arrived via EMS were more likely to receive timely treatment than self-transported patients(door-to needle time≤60 min 52.6%vs 29.4%,OR=2.58(95%CI 1.35 to 4.92)).Conclusions EMS use is associated with timely stroke evaluation and treatment in *** EMS-Hospital stroke pathways and targeted public campaigns to advocate for appropriate EMS use have the potential to improve acute stroke care.

关键词： needle treatment likely

Association between the elderly frequent attender to the emergency department and 30-day mortality： A retrospective study over 10 years

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World Journal of Emergency Medicine 2018年第1期9卷 20-25页

作者： Yuzeng Shen Yee Chien Tay Edward Wee Kwan Too Nan Liu Shao Wei Lam Marcus eng Hock ong Department of Emergency Medicine Singapore General Hospital Singapore Department of Emergency Medicine Sengkang Health Singapore Business Analytics Program National University of Singapore Singapore Singhealth Health Selvices Research Centre Singapore

BACKGROUND: To determine if elderly frequent attenders are associated with increased 30-day mortality, assess resource utilization by the elderly frequent attenders and identify associated characteristics that contribute to mortality. METHODS: Retrospective observational study of electronic clinical records of all emergency department(ED) visits over a 10-year period to an urban tertiary general hospital in Singapore. Patients aged 65 years and older, with 3 or more visits within a calendar year were identified. Outcomes measured include 30-day mortality, admission rate, admission diagnosis and duration spent at ED. Chi-square-tests were used to assess categorical factors and Student t-test was used to assess continuous variables on their association with being a frequent attender. Univariate and multivariate logistic regressions were conducted on all significant independent factors on to the outcome variable(30-day mortality), to determine factor independent odds ratios of being a frequent ***: 1.381 million attendance records were analyzed. Elderly patients accounted for 25.5% of all attendances, of which 31.3% are frequent attenders. Their 30-day mortality rate increased from 4.0% in the first visit, to 8.8% in the third visit, peaking at 10.2% in the sixth visit. Factors associated with mortality include patients with neoplasms, ambulance utilization, male gender and having attended the ED the previous ***: Elderly attenders have a higher 30-day mortality risk compared to the overall ED population, with mortality risk more marked for frequent attenders. This study illustrates the importance and need for interventions to address frequent ED visits by the elderly, especially in an aging society.

关键词： Frequent attenders Elderly Emergency department Mortality

Recent advances in graphene-based phase change composites for thermal energy storage and management

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Comparative analysis of current diagnostic PCR assays in detecting pathogenic Leptospira isolates from environmental samples

纳米材料科学 2024年第2期 115页

作者： Qiang Zhu Pin Jin ong Si hui Angela Goh Reuben J.Yeo Suxi Wang Zhiyuan Liu Xian Jun Loh

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Asian Pacific Journal of Tropical Medicine 2019年第10期12卷 472-478页

作者： May-Ling Yap Zamberi Sekawi hui-Yee Chee Han Kiat Alan ong Vasantha Kumari Neela Department of Medical Microbiology and Parasitology Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Pre-Clinical Sciences Faculty of Medicine and Health SciencesUniversiti Tunku Abdul RahmanBandar Sungai Long43000 KajangSelangorMalaysia

Objective:To compare the efficiency of routine diagnostic PCR assays in detecting pathogenic Leptospira isolated from water and ***:Seven routine assays targeting six genes(lip L32,fla B,gyr B,lfb1,sec Y and lig B)were evaluated and compared on the cultures of two groups of pathogenic Leptospira from different *** group included 19 described reference strains recovered from infected human or animals,and another group included 22 environmental isolates from recreational and residential sites in *** latter have been confirmed for presence of pathogenic Leptospira *** positivity or detection sensitivity of each assay was determined and compared between the two ***:Validation on reference strains showed 100.0%PCR sensitivity for all assays except lig B-PCR(95.0%)that failed to amplify Leptospira interrogans serovar *** marked contrast,there was a notable decline in sensitivity in the environmental isolates(lip L32-PCR,95.5%;fla B-PCR,90.9%;gyr B-PCR,77.3%;lfb1-PCR,59.1%;sec Y-PCRs,40.9%G1/G2-PCR,36.4%;lig B-PCR,13.6%),implying a large genetic distance between the two groups,as well as nucleotide polymorphism among environmental ***:High proportion of false-negative PCR results suggests a need of prudent selection of primers in detecting environmental pathogenic *** findings offer valuable insights on the extensive biodiversity of genus Leptospira and its impact on the efficacy and development of molecular detection tool.

关键词： Leptospira Pathogenic species Environmental samples PCR Sensitivity

Large animal models of cardiac ischemia-reperfusion injury:Where are we now?

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Zoological Research 2023年第3期44卷 591-603页

作者： Attaur Rahman Yuhao Li To-Kiu Chan hui Zhao Yaozu Xiang Xing Chang Hao Zhou Dachun Xu Sang-Bing ong Department of Medicine and Therapeutics Faculty of MedicineThe Chinese University of Hong Kong(CUHK)Hong Kong SARChina Centre for Cardiovascular Genomics and Medicine(CCGM) Lui Che Woo Institute Innovative MedicineThe Chinese University of Hong Kong(CUHK)Hong Kong SARChina College of Veterinary Sciences and Animal Husbandry Abdul Wali Khan University MardanMardanKhyber Pakhtunkhwa 23200Pakistan School of Biomedical Sciences CUHK-GIBH CAS Joint Laboratory on Stem Cell and Regenerative MedicineThe Chinese University of Hong Kong(CUHK)Hong Kong SARChina Institute for Tissue engineering and Regenerative Medicine(iTERM) The Chinese University of Hong Kong(CUHK)Hong Kong SARChina SBS Core Laboratory CUHK Shenzhen Research InstituteShenzhenGuangdong 518172China Kunming Institute of Zoology–The Chinese University of Hong Kong(KIZ-CUHK)Joint Laboratory of Bioresources and Molecular Research of Common Diseases Hong Kong SARChina Shanghai East Hospital Key Laboratory of Arrhythmias of the Ministry of Education of ChinaSchool of Life Sciences and TechnologyTongji UniversityShanghai 200092China Guang’anmen Hospital China Academy of Chinese Medical SciencesBeijing 100053China Department of Cardiology Chinese People’s Liberation Army General HospitalBeijing 100853China Center for Cardiovascular Research and Alternative Medicine University of Wyoming College of Health SciencesLaramieWY 82071USA Department of Cardiology Shanghai Tenth People’s HospitalTongji University School of MedicineShanghai 200072China Hong Kong Hub of Paediatric Excellence(HK HOPE) Hong Kong Children’s Hospital(HKCH)Kowloon BayHong Kong SARChina CUHK Shenzhen Research Institute(SZRI) ShenzhenGuangdong 518172China Neural Vascularand Metabolic Biology Thematic Research ProgramSchool of Biomedical SciencesThe Chinese University of Hong Kong(CUHK)Hong Kong SARChina

Large animal models of cardiac ischemia-reperfusion are critical for evaluation of the efficacy of cardioprotective interventions prior to clinical ***,current cardioprotective strategies/interventions formulated in preclinical cardiovascular research are often limited to small animal models,which are not transferable or reproducible in large animal models due to different factors such as:(i)complex and varied features of human ischemic cardiac disease(ICD),which are challenging to mimic in animal models,(ii)significant differences in surgical techniques applied,and(iii)differences in cardiovascular anatomy and physiology between small versus large *** article highlights the advantages and disadvantages of different large animal models of preclinical cardiac ischemic reperfusion injury(IRI),as well as the different methods used to induce and assess IRI,and the obstacles faced in using large animals for translational research in the settings of cardiac IR.

关键词： Cardiovascular disorder Ischemic cardiac disease Ischemic-reperfusion injury Large animal model Myocardial infarction Translational gap

东南亚教育部长组织所涉地区科学、数学和技术教育的现状

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全球教育展望 2002年第2期31卷 23-26页

作者： Tan Khun ong eng Tek 东南亚教育部组织地区科学和数学教育中心东南亚教育部科学处地区科学和数学教育中心

现状概述九十年代末科学、数学和技术教育的状况看来会延续到新的千年.这一状况的主要特点是:在认识方面更加强调学生自己构筑知识而不是由教师向学生灌输知识.

关键词：东南亚地区科学数学技术教育现状

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原木端面裂纹检测的智能方法

林产工业 2024年第4期61卷 42-48,58页

作者：李园郑圣龙何雨晨解林坤周晓剑杜官本周华万辉西南林业大学材料与化学工程学院云南昆明650233 西南林业大学大数据与智能工程学院云南昆明650233

原木在干燥过程中端面会出现开裂,影响原木质量。为了自动、准确、高效地检测原木的端面裂纹信息,本文提出了一种基于深度学习的原木端面裂纹定量检测方法。分别使用FCN、U-Net、U-Net++三种语义分割网络对原木端面中的裂纹区域及端面... 详细信息

原木在干燥过程中端面会出现开裂,影响原木质量。为了自动、准确、高效地检测原木的端面裂纹信息,本文提出了一种基于深度学习的原木端面裂纹定量检测方法。分别使用FCN、U-Net、U-Net++三种语义分割网络对原木端面中的裂纹区域及端面区域进行分割。通过识别不同的开裂类型,将分割出的整体裂纹划分成单独裂纹,并利用Hough变换圆检测算法检测出轮裂。通过分割出的裂纹图像和端面图像定义开裂占比、开裂区域面积、端面区域面积,通过裂纹的骨架线长度和裂纹轮廓内的最大内接圆直径描述裂纹的长度和最大宽度。最后分别对裂纹划分前和裂纹划分后进行计算并输出可视化图片。结果表明:U-Net++模型对裂纹的检测效果更优,研究结果可为原木质量评估提供数据支持。

关键词：木材裂纹桉木图像分割深度学习原木检测 U-Net++