检索结果-南通市图书馆

Corrosion engineering boosting bulk Fe_(50)Mn_(30)Co_(10)Cr_(10)high-entropy alloy as high-efficient alkaline oxygen evolution reaction electrocatalyst

引用

Journal of Materials Science & Technology 2022年第14期109卷 267-275页

作者： Pengfei Zhou Dong Liu Yuyun Chen Mingpeng Chen Yunxiao Liu Shi Chen chi tat kwok Yuxin Tang Shuangpeng Wang Hui Pan Institute of Applied Physics and Materials Engineering University of Macao999078Macao Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of Macao999078Macao Department of Electromechanical Engineering Faculty of Science and TechnologyUniversity of Macao999078Macao College of Chemical Engineering Fuzhou UniversityFuzhou 350116China

Oxygen evolution reaction(OER)is a critical process in electrocatalytic water splitting.However,the development of low-cost,highly efficient OER electrocatalysts by a simple method that can be used for industrial application on a large scale is still a huge challenge.Recently,high entropy alloy(HEA)has acquired extensive attention,which may provide answers to the current dilemma.Here,we report bulk Fe_(50)Mn_(30)Co_(10)Cr_(10),which is prepared by 3D printing on a large scale,as electrocatalyst for OER with high catalytic performance.Especially,an easy approach,corrosion engineering,is adopted for the first time to build an active layer of honeycomb nanostructures on its surface,leading to ultrahigh OER performance with an overpotential of 247 mV to achieve a current density of 10 mA cm^(-2),a low Tafel slope of 63 mV dec^(-1),and excellent stability up to 60 h at 100 mA cm^(-2)in 1 M KOH.The excellent catalytic activity mainly originates from:(1)the binder-free self-supported honeycomb nanostructures and multi-component hydroxides,which improve intrinsic catalytic activity,provide rich active sites,and reduce interfacial resistance;and(2)the diverse valence states for multiple active sites to enhance the OER kinetics.Our findings show that corrosion engineering is a novel strategy to improve the bulk HEA catalytic performance.We expect that this work would open up a new avenue to fabricate large-scale HEA electrocatalysts by 3D printing and corrosion engineering for industrial applications.

关键词： Electrocatalysis High entropy alloy Corrosion engineering Self-supporting Oxygen evolution reaction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A corrosion study on W-Cu alloys in sodium chloride solution at different pH

引用

Journal of Materials Science & Technology 2021年第5期64卷 38-56页

作者： Dawei Guo chi tat kwok Department of Electromechanical Engineering University of MacaoMacaoChina Institute of Applied Physics and Materials Engineering University of MacaoMacaoChina

A corrosion study of two types of tungsten-copper(W-Cu)alloys in 3.38 wt.%Na Cl solution with different pH at 25℃were investigated using potentiodynamic polarization and immersion test.It is crucial that the corrosion behavior and preferential attacked phases of the W-Cu alloys were found to alter with p H.The micro-galvanic effect of tungsten phase and copper binder played a significant role.It was also proved that the existence of aggressive chloride ions could accelerate the Cu binder dissolution in acidic and neutral solution,which induced tungsten phase detachment and increased the corrosion rate of the W-Cu alloys.While Cl-would accelerate the Cu binder dissolution of W-Cu alloys at high potential during polarization test in strong alkaline solution.

关键词： Tungsten-copper alloys Galvanic corrosion Potentiodynamic polarization Immersion test Chloride ion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microbiologically Influenced Corrosion Behavior of Fe_(40)(CoCrMnNi)_(60) and Fe_(60)(CoCrMnNi)_(40) Medium Entropy Alloys in the Presence of Pseudomonas Aeruginosa

引用

Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 379-390页

作者： Weiwei Chang Yangyang Li Huaibei Zheng Hongchang Qian Dawei Guo Shuyuan Zhang Yuntian Lou chi tat kwok Lap Mou Tam Dawei Zhang National Materials Corrosion and Protection Data Center Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China BRI Southeast Asia Network for Corrosion and Protection(MOE) Shunde Graduate School of University of Science and Technology BeijingFoshan 528399China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan 114002China Department of Electromechanical Engineering University of MacaoMacao 999078China Institute for the Development and Quality Macao 999078China

In this work,the microbiologically influenced corrosion(MIC)of Fe_(40)(CoCrMnNi)_(60) and Fe_(60)(CoCrMnNi)_(40) medium entropy alloys(MEAs)induced by Pseudomonas aeruginosa(P.aeruginosa)was investigated.Corrosion behaviors during 14 days of immersion in sterile and P.aeruginosa-inoculated culture media are presented.Under sterile conditions,both MEAs exhibited good corrosion resistance against the culture medium solution.In the presence of P.aeruginosa,the pitting corrosion of MEAs was promoted.The results of inductively coupled plasma‒mass spectrometry(ICP‒MS)and potentiodynamic polarization tests showed that the presence of P.aeruginosa promoted the selective dissolution of passive film and accelerated the corrosion of MEAs.The results of X-ray photoelectron spectroscopy(XPS)and Mott-Schottky measurements further demonstrated the degradation effect of P.aeruginosa on the passive film.Compared with Fe_(60)(CoCrMnNi)_(40),Fe_(40)(CoCrMnNi)_(60) manifested better resistance to the MIC caused by P.aeruginosa,which may be attributed to more Cr oxides and fewer Fe oxides of the passive film.

关键词： Microbiologically influenced corrosion Medium entropy alloys Pseudomonas aeruginosa

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Remarkable synergistic effect in cobalt-iron nitride/alloy nanosheets for robust electrochemical water splitting

引用

Journal of Energy Chemistry 2022年第2期31卷 405-414页

作者： Mingpeng Chen Di Liu Baoye Zi Yuyun Chen Dong Liu Xinyu Du Feifei Li Pengfei Zhou Ye Ke Jielei Li Kin Ho Lo chi tat kwok Weng Fai Ip Shi Chen Shuangpeng Wang Qingju Liu Hui Pan Institute of Applied Physics and Materials Engineering University of MacaoMacaoChina Yunnan Key Laboratory for Micro/Nano Materials&Technology National Center for International Research on Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming 650091YunnanChina Department of Electromechanical Engineering Faculty of Science and TechnologyUniversity of MacaoMacaoChina Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of MacaoMacaoChina

Design and synthesis of noble-metal-free bifunctional catalysts for efficient and robust electrochemical water splitting are of significant importance in developing clean and renewable energy sources for sustainable energy consumption.Herein,a simple three-step strategy is reported to construct cobalt-iron nitride/alloy nanosheets on nickel foam(CoFe-NA/NF)as a bifunctional catalyst for both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).The electrocatalyst with optimized composition(CoFe-NA2/NF)can achieve ultralow overpotentials of 73 mV and 250 mV for HER and OER,respectively,at a current density of 10 mA cm^(-2) in 1 M KOH.Notably,the electrolyzer based on this electrocatalyst is able to boost the overall water splitting with a cell voltage of 1.564 V to deliver 10 mA cm^(-2) for at least 50 h without obvious performance decay.Furthermore,our experiment and theoretical calculation demonstrate that the combination of cobalt-iron nitride and alloy can have low hydrogen adsorption energy and facilitate water dissociation during HER.In addition,the surface reconstruction introduces metal oxyhydroxides to optimize the OER process.Our work may pave a new pathway to design bifunctional catalysts for overall water splitting.

关键词： Bifunctional electrocatalyst Metal nitride/alloy nanocomposite Overall water splitting High performance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

阳极氧化AlCoCrFeNi高熵合金用于高效碱性电解水

引用

Science china Materials 2023年第3期66卷 1033-1041页

作者：周鹏飞黄宝琪牛朋达陈明鹏郭志达汤育欣李瑞迪王双鹏潘晖 Institute of Applied Physics and Materials Engineering University of MacaoMacao SAR 999078China Department of Electromechanical Engineering Faculty of Science and TechnologyUniversity of MacaoMacao SAR 999078China Science and Technology on High Strength Structural Materials Laboratory State Key Laboratory of Powder MetallurgyCentral South UniversityChangsha 410083China College of Chemical Engineering Fuzhou UniversityFuzhou 350116China Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of MacaoMacao SAR 999078China

碱性水电解(AWE)作为一种具有工业应用前景的绿色制氢方法,能够用来改善能源短缺和环境污染问题.然而,由于电极材料昂贵且效率低下,这种方法生产氢气的效率比较低.本文采用块状AlCoCrFeNi高熵合金作为碱性电解水的有效电极.研究发现通... 详细信息

碱性水电解(AWE)作为一种具有工业应用前景的绿色制氢方法,能够用来改善能源短缺和环境污染问题.然而,由于电极材料昂贵且效率低下,这种方法生产氢气的效率比较低.本文采用块状AlCoCrFeNi高熵合金作为碱性电解水的有效电极.研究发现通过快速阳极氧化(5 min)处理的高熵合金可以同时对析氢和析氧反应(HER和OER)具有超高的催化活性,只需要880和845 m V的过电位就可以达到-500 mA cm-2(HER)和500 mA cm-2(OER)的电流密度.特别地,该催化剂只需要3.00 V就可以达到500 mA cm-2的全解水电流密度,并且在此电流密度下表现出超过100小时的出色稳定性.我们的研究表明,阳极氧化的块体AlCoCrFeNi高熵合金作为高效催化剂在工业水电解制氢中具有广阔的应用前景,有望用于缓解环境问题和能源危机.

关键词：阳极氧化碱性电解水高熵合金电流密度碱性水电解能源危机水电解制氢制氢方法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparing 11 early warning scores and three shock indices in early sepsis prediction in the emergency department

引用

World Journal of Emergency Medicine 2024年第4期15卷 273-282页

作者： Rex Pui Kin Lam Zonglin Dai Eric Ho Yin Lau Carrie Yuen Ting Ip Ho ching Chan Lingyun Zhao tat chiTsang Matthew Sik Hon Tsui Timothy Hudson Rainer Department of Emergency Medicine School of Clinical MedicineLi Ka Shing Faculty of Medicinethe University of Hong KongHong KongChina School of Public Health Li Ka Shing Faculty of Medicinethe University of Hong KongHong KongChina Accident and Emergency Department Queen Mary HospitalHong KongChina

BACKGROUND:This study aimed to evaluate the discriminatory performance of 11 vital sign-based early warning scores(EWSs)and three shock indices in early sepsis prediction in the emergency department(ED).METHODS:We performed a retrospective study on consecutive adult patients with an infection over 3 months in a public ED in Hong Kong.The primary outcome was sepsis(Sepsis-3 definition)within 48 h of ED presentation.Using c-statistics and the DeLong test,we compared 11 EWSs,including the National Early Warning Score 2(NEWS2),Modified Early Warning Score,and Worthing Physiological Scoring System(WPS),etc.,and three shock indices(the shock index[SI],modified shock index[MSI],and diastolic shock index[DSI]),with Systemic Inflammatory Response Syndrome(SIRS)and quick Sequential Organ Failure Assessment(qSOFA)in predicting the primary outcome,intensive care unit admission,and mortality at different time points.RESULTS:We analyzed 601 patients,of whom 166(27.6%)developed sepsis.NEWS2 had the highest point estimate(area under the receiver operating characteristic curve[AUROC]0.75,95%CI 0.70-0.79)and was significantly better than SIRS,qSOFA,other EWSs and shock indices,except WPS,at predicting the primary outcome.However,the pooled sensitivity and specificity of NEWS2≥5 for the prediction of sepsis were 0.45(95%CI 0.37-0.52)and 0.88(95%CI 0.85-0.91),respectively.The discriminatory performance of all EWSs and shock indices declined when used to predict mortality at a more remote time point.CONCLUSION:NEWS2 compared favorably with other EWSs and shock indices in early sepsis prediction but its low sensitivity at the usual cut-off point requires further modification for sepsis screening.

关键词： Sepsis Emergency department Clinical prediction rule Early warning score Shock index

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficient C-N coupling in electrocatalytic urea generation on copper carbonate hydroxide electrocatalysts

引用

Journal of Energy Chemistry 2024年第6期93卷 289-298,I0008页

作者： Yinuo Wang Yian Wang Qinglan Zhao Hongming Xu Shangqian Zhu Fei Yang Ernest P.Delmo Xiaoyi Qiu chi Song Juhee Jang Tiehuai Li Ping Gao MDanny Gu Minhua Shao Advanced Materials Thrust The Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511400GuangdongChina Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Materials Science and Engineering Southern University of Science and Technology of Chin11088 Xueyuan BoulevardShenzhen 518055GuangdongChina Energy Institute and Chinese National Engineering Research Center for Control&Treatment of Heavy Metal PollutionThe Hong Kong University of Science and TechnologyKowloonHong KongChina Department of Chemistry City University of Hong KongTat Chee AvenueKowloonHong KongChina

Urea generation through electrochemical CO_(2) and NO_(3)~-co-reduction reaction(CO_(2)NO_(3)RR)is still limited by either the low selectivity or yield rate of urea.Herein,we report copper carbonate hydroxide(Cu_2(OH)_2CO_(3))as an efficient CO_(2)NO_(3)RR electrocatalyst with an impressive urea Faradaic efficiency of45.2%±2.1%and a high yield rate of 1564.5±145.2μg h~(-1)mg_(cat)~(-1).More importantly,H_(2) evolution is fully inhibited on this electrocatalyst over a wide potential range between-0.3 and-0.8 V versus reversible hydrogen electrode.Our thermodynamic simulation reveals that the first C-N coupling follows a unique pathway on Cu_2(OH)_2CO_(3) by combining the two intermediates,~*COOH and~*NHO.This work demonstrates that high selectivity and yield rate of urea can be simultaneously achieved on simple Cu-based electrocatalysts in CO_(2)NO_(3)RR,and provide guidance for rational design of more advanced catalysts.

关键词： Copper carbonate hydroxide Co-reduction Urea generation C-N coupling DFT calculation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

ABC/2 formula for"bedside"postoperative pneumocephalus volume measurement

引用

chinese Neurosurgical Journal 2022年第4期8卷 284-291页

作者： David Yuen Chung Chan Eric Yuk Hong Cheung Ka Ho Hui Cecelia Mei Sze Leung Stephanie chi Ping Ng Wai Kit Mak George kwok Chu Wong tat Ming Danny Chan Wai Sang Poon Division of Neurosurgery Department of SurgeryFaculty of MedicinePrince of Wales HospitalThe Chinese University of Hong KongHong KongSARChina

Background:Postoperative pneumocephalus is associated with a higher risk of recurrence of chronic subdural hematoma(cSDH).However,there is no verified simple way to measure the pneumocephalus volume at the bedside for daily clinical use.The ABC/2 method was shown to be a simple and reliable technique to estimate volumes of intracranial lesions,such as intracranial hematomas.This study aims to evaluate the accuracy of the ABC/2 formula in estimating volumes of pneumocephalus,as compared to the gold standard with computer-assisted volumetric analysis.Methods:A total of 141 postoperative computed tomographic(CT)brain scans of cSDH patients with burr-hole drainage were analysed.Pneumocephalus volume was measured independently by both the ABC/2 formula and the computer-assisted volumetric measurement.For the computer-assisted measurement,the volume of the air was semiautomatically segmented and calculated by computer software.Linear regression was used to determine the correlation between the ABC/2 method and computer-assisted measurement.Results:The postoperative pneumocephalus volume after bilateral burr-hole drainage was significantly larger than that of unilateral burr-hole drainage(29.34 ml versus 12.21 ml,ptatistically significant.Conclusions:An excellent correlation is observed between the ABC/2 method and the computer-assisted measurement.This study verified that the ABC/2 method is an accurate and simple"bedside"technique to estimate pneumocephalus volume.

关键词： ABC/2 Chronic subdural haematoma Burr-hole Pneumocephalus

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Acupuncture for low back pain:a clinical practice guideline from the Hong Kong taskforce of standardized acupuncture practice

引用

Journal of Traditional chinese Medicine 2022年第1期42卷 140-147页

作者： CHEN Haiyong YEUNG Wing-Fai YANG Mingxiao MU Jinglan ZIEA tat-chi NG Bacon Fung-Leung LAO Lixing School of chinese Medicine University of Hong KongHong Kong SARChina School of Nursing Hong Kong Polytechnic UniversityHong Kong SARChina Bendheim Integrative Medicine Center Memorial Sloan Kettering Cancer Center1429 First AvenueNew York 10021USA Department of Anesthesiology Nanjing Drum Tower HospitalNanjing University Medical SchoolNanjing210008China chinese Medicine Department Hong Kong Hospital AuthorityHong Kong SARChina Virginia University of Integrative Medicine FairfaxVA 22031USA

OBJECTIVE:To develop a clinical practice guideline to guide the treatment of low back pain by acupuncture.METHODS:An integrative approach of systematic review of literature,clinical evidence classification,expert opinion surveying,and consensus establishing via a Delphi program was utilized during the developing process.Both evidence-based practice standards and the personalized features of acupuncture were taken into considerations.RESULTS:Based on clinical evidence and expert opinions,we developed a clinical practice guideline for the treatment of low back pain with acupuncture.These recommendations have a wide coverage spanning from Western Medicine diagnosis and Traditional chinese Medicine syndrome differentiation,to acupuncture treatment procedures,as well as post treatment care for rehabilitation and follow-ups.The recommendations for acupuncture practice included treatment principles,therapeutic regimens,and operational procedures.The levels of evidence and strength of recommendation were rated for each procedure of practice.CONCLUSION:A clinical practice guideline for acupuncture treating low back pain was developed based on contemporary clinical evidence and experts'consensus to provide best currently agreeable practice guideline for domestic and international stakeholders.

关键词： acupuncture low back pain diagnosis syndrome differentiation rehabilitation practice guideline

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Diagnostic accuracy of Focused Abdominal Sonography for Trauma in blunt abdominal trauma patients in a trauma centre of Hong Kong

引用

chinese Journal of Traumatology 2012年第5期15卷 273-278页

作者： Cheung Kent Shek Wong Hay Tai Leung Ling Pong Tsang tat chi Leung Gilberto Ka Kit Department of Accident and Emergency Queen Mary Hospital 102 Pokfulam Road Pokfulam Hong Kong China Department of Surgery Li Ka Shing Faculty of Medicine University of Hong Kong Hong Kong China

为损伤的 ObjectiveFocused 腹的 Sonography (快) 广泛地为 intraperitoneal 的察觉被使用在受不了钝腹的损伤(蝙蝠) 的病人的免费液体。针对在指明的损伤 centre.MethodsThis 估计这调查的诊断精确性的这研究是在在香港在一个损伤中... 详细信息

为损伤的 ObjectiveFocused 腹的 Sonography (快) 广泛地为 intraperitoneal 的察觉被使用在受不了钝腹的损伤(蝙蝠) 的病人的免费液体。针对在指明的损伤 centre.MethodsThis 估计这调查的诊断精确性的这研究是在在香港在一个损伤中心看见的 6 年时期上的蝙蝠病人的回顾的研究。快调查结果与剖腹术，腹的计算断层摄影术或尸体调查结果相比，它为 intraperi-toneal 的存在用作标准答案免费液体。没快有的病人或确定的测试执行了，有先存在的腹液体，在复活死了或有快调查结果的 imcomplete 文档的标准答案被排除。性能当敏感，特性，预兆的值(PV ) ，可能性的比率(LR ) 和 accuracy.ResultsFAST 在 302 个病人被执行，他们中的 153 个在这分析被包括，快被表示。敏感，特性，积极 PV，否定 PV，积极 LR，否定 LR 和精确性为快分别地 50.0% ， 97.3% ， 87.0% ， 84.6% ， 18.8， 0.5 和 85.0% 。快被发现在不太严重地受伤的病人和在更严重地受伤的 patients.ConclusionFAST 特定的更多更敏感是在对蝙蝠病人的起始的评价的可靠调查。诊断价值能被损害的严厉快影响，职员训练被需要进一步提高它的有效使用。

关键词：诊断准确性闭合性创伤患者腹部损伤香港超音波

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：