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Composition-dependent catalytic performance of Au_(x)Ag_(25-x) alloy nanoclusters for oxygen reduction reaction

Nano Research 2024年第11期17卷 9490-9497页

作者： chuan mu Biao Wang Qiaofeng Yao Qian He Jianping Xie Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Fuzhou 350207 China Department of Chemical and Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 Singapore 117585 Singapore School of Physical Science and Technology Southwest University Chongqing 400715 China Key Laboratory of Organic Integrated Circuits Ministry of Education and Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry School of Science Tianjin University Tianjin 3700072 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 China Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore

Oxygen reduction reaction(ORR)occurs at the cathode of electrochemical devices like fuel cells and in the Huron-Dow process,reducing oxygen to water or hydrogen *** the past years,various electrocatalysts with enhanced activity,selectivity,and durability have been developed for ***,an atomic-level understanding of how materials composition affects electrocatalytic performance has not yet been achieved,which prevents us from designing efficient catalysts based on the requirements of practical *** is partially because of the polydispersity of traditional catalysts and their unknown structure dynamics in the electrocatalytic *** we establish a full-spectrum of atomically precise and robust Au_(x)Ag_(25-x)(MHA)18(x=0–25,and MHA=6-mercaptohexanoic acid)nanoclusters(NCs)and systematically investigate their composition-dependent catalytic performance for ORR at the atomic *** results show that,with the increasing number of Au atoms in Au_(x)Ag_(25-x)(MHA)18 NCs,the electron transfer number gradually decreases from 3.9 for Ag25(MHA)18 to 2.1 for Au25(MHA)18,indicating that the dominant oxygen reduction product alters from water to hydrogen *** functional theory simulations reveal that the Gibbs free energy of OOH adsorption(ΔGOOH*)on Au25 is closest to the idealΔGOOH*of 4.22 eV to produce H_(2)O_(2),while Ag alloying makes theΔGOOH*deviate from the optimal value and leads to the production of *** study suggests that alloy NCs are promising paradigms for unveiling composition-dependent electrocatalytic performance of metal nanoparticles at the atomic level.

关键词： metal nanoclusters synthesis electrocatalysis structure-property relationship

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Improved plasma position detection method in EAST Tokamak using fast CCD camera

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Nuclear Science and Techniques 2019年第2期30卷 71-80页

作者： Shuang-Bao Shu chuan-mu Yu Chao Liu Mei-Wen Chen Yu-Zhong Zhang Xin Li School of Instrument Science and Opto-electronics Engineering Hefei University of Technology China Institute of Plasma Physics Chinese Academy of Sciences

To control the steady-state operation of Tokamak plasma, it is crucial to accurately obtain its shape and position. This paper presents a method for use in rapidly detecting plasma configuration during discharge of the Experimental Advanced Superconducting Tokamak device. First, a visible/infrared integrated endoscopy diagnostic system with a large field of view is introduced,and the ***5.5 camera in this system is used to acquire a plasma discharge image. Based on the analysis of various traditional edge detection algorithms, an improved wavelet edge detection algorithm is then introduced to identify the edge of the plasma. In this method, the local maximum of the modulus of wavelet transform is searched along four gradient directions, and the adaptive threshold is adopted. Finally, the detected boundary is fitted using the least square iterative method to accurately obtain the position of the plasma. Experimental results obtained using the EAST device show that the method presented in this paper can realize expected goals and produce ideal effects;this method thus has significant potential for application in further feedback control of plasma.

关键词： Experimental Advanced Superconducting Tokamak (EAST) Plasma CCD camera Edge detection

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High electrocatalytic hydrogen evolution activity on a coupled Ru and CoO hybrid electrocatalyst

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Journal of Energy Chemistry 2019年第10期28卷 143-147页

作者： Jia-Xin Guo Dong-Yang Yan Kang-Wen Qiu chuan mu Dian Jiao Jing Mao Hui Wang Tao Ling Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Tianjin Key Laboratory of Composite and Functional MaterialsSchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

Hydrogen evolution reaction (HER) is an essential step in converting renewable energy to clean hydrogen fuel. Exploring highly efficient, stable and cost-effective electrocatalysts is of crucial significance for sustainable HER. Here, we report the design of a coupled ruthenium/cobalt oxide (Ru/CoO) hybrid electrocatalyst for alkaline HER. In this hybrid metal/oxide system, the complicated alkaline HER pathways are overall facilitated;oxygen (O)-vacancy-abundant oxide enhances water splitting and Ru promotes successive hydrogen intermediates to generate hydrogen. The resulting Ru/CoO hybrid electrocatalyst exhibits significantly promoted catalytic activity compared with benchmark Ru catalyst, displaying an overpotential of 55 mV to generate a HER current density of 10 mA cm^-2, comparable with the state-of-the-art Pt/C catalyst and the most efficient alkaline HER electrocatalysts. Furthermore, the strong interaction of Ru nanoparticles with oxide support and the in-situ growth of oxide support on conductive substrate guarantee the long-term stability of as-fabricated Ru/CoO hybrid electrocatalyst. This newly designed hybrid catalyst with abundant metal/oxide interfaces may pave a new pathway for exploring efficient and stable HER electrocatalysts.

关键词： Ruthenium Oxides Hybrid electrocatalyst Hydrogen evolution reaction

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Robot-assisted gallbladder-preserving hepatectomy for treating S5 hepatoblastoma in a child: A case report and review of the literature

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World Journal of Clinical Cases 2019年第7期7卷 872-880页

作者： Di-Xiang Chen Shan-Jie Wang Ya-Nan Jiang mu-chuan Yu Jun-Zhen Fan Xian-Qiang Wang Department of Pediatrics PLA General Hospital Department of Hepatobiliary Sixth People’s Hospital of Jinan Affiliated to Jining Medical School Beijing University of Chinese Medicine Department of Pathology PLA General Hospital

BACKGROUND Hepatoblastoma(HB) is the most common hepatic malignant tumour in children,accounting for approximately 50%-60% of primary hepatic malignant tumours in children, mostly in children under 3 years old. In Western countries, the incidence of hepatoblastoma is approximately 1-2/100000. Da Vinci surgical system is fast becoming a key instrument in microinvasive surgery. The past decade has seen the rapid development of robot-assisted laparoscopy, which expends many fields including the liver surgery. This paper discusses the significance and feasibility of robot-assisted gallbladder-preserving hepatectomy for treating S5 hepatoblastoma in children. The aim of this essay is to compare the safety and effectiveness of robotic surgery with conventional laparoscopic surgery, and explore the meaning of preservation of the gallbladder by sharing this *** SUMMARY A 3-year-old child with a liver mass in the 5 th segment was treated using the Da Vinci surgical system, and the gallbladder was retained. The child was admitted to the hospital for 20 d for the discovery of the right hepatic lobe *** revealed a low echo mass, 46 mm × 26 mm × 58 mm in size,indicating hepatoblastoma in the right lobe, and enhanced computed tomography showed continuous enhancement of iso-low-density lesions with different sizes and nodules and unclear boundaries, without the dilation of the intrahepatic bile duct, no enlargement of the gallbladder, and uniform thickness of the wall. The diagnosis was "liver mass, hepatoblastoma". It was decided to perform S5 liver tumour resection. During surgery, the tumour and gallbladder were isolated first, and the gallbladder could be completely separated from the tumour surface without obvious infiltration; therefore, the gallbladder was preserved. The cutting line was marked with an electric hook. The hepatic duodenal ligament was blocked with a urethral catheter using the Pringle method, and the tumour and part of the normal liver

关键词： Hepatectomy Robotic surgery Pediatrics Hepatoblastoma Case report

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Laparoscopic pancreaticoduodenectomy via a reverse-''V'' approach with four ports:Initial experience and perioperative outcomes

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World Journal of Gastroenterology 2015年第5期21卷 1588-1594页

作者： Zhao Liu mu-chuan Yu Rui Zhao Yan-Feng Liu Jian-Ping Zeng Xian-Qiang Wang Jing-Wang Tan Department of Hepatobiliary and Pancreatic Surgery Jinan Central HospitalShandong University Department of Hepatobiliary Surgery Zhangqiu People’s HospitalAffiliated Hospital of Jining Medical University Department of Hepatobiliary Surgery Qilu HospitalShandong University Department of Hepatobiliary Surgery Changgeng HospitalAffiliated to Tsinghua University Department of Hepatobiliary Surgery Hainan Hospitalthe Chinese PLA General Hospital

AIM:To evaluate the feasibility,safety,and efficacy of laparoscopic pancreaticoduodenectomy(LPD) using a reverse-"V" approach with four ***:This is a retrospective study of selected patients who underwent LPD at our center between April 2011 and April *** following data were collected and reviewed:patient characteristics,tumor histology,surgical outcome,resection margins,morbidity,and *** patients were thoroughly evaluated preoperatively by complete hematologic investigations,triple-phase helical computed tomography,upper gastrointestinal endoscopy,and biopsy of ampullary lesions(when present).Magnetic resonance cholangiopancreatography was performed for doubtful cases of lower common bile duct ***:There was no perioperative *** was performed with tumor-free margins in all patients,including patients with pancreatic ductal adenocarcinoma(n = 6),ampullary carcinoma(n = 6),intra-ductal papillary mucinous neoplasm(n = 2),pancreatic cystadenocarcinoma(n = 2),pancreatic head adenocarcinoma(n = 3),and bile duct cancer(n = 2).The mean patient age was 65 years(range,42-75 years).The median blood loss was 240 m L,and the mean operative time was 368 ***:LPD using a reverse-"V" approach can be performed safely and yields good results in elective *** preliminary experience showed that LDP can be performed via a reverse-"V" *** approach can be used to treat localized malignant lesions irrespective of histopathology.

关键词： Laparoscopic pancreaticoduodenectomy Operation Ind

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Relationship between celiac artery variation and number of lymph nodes dissection in gastric cancer surgery

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World Journal of Gastrointestinal Oncology 2019年第6期11卷 499-508页

作者： Guang-chuan mu Yuan Huang Zhi-Ming Liu Zhi-Bai Chen Xiang-Hua Wu Xin-Gan Qin Yan-Jun Zeng Department of Gastrointestinal Surgery the First Affiliated Hospital of Guangxi Medical UniversityNanning 530021Guangxi Zhuang Autonomous RegionChina Department of General Surgery the Second Affiliated Hospital of Guangxi Medical UniversityNanning 530000Guangxi Zhuang Autonomous RegionChina Biomechanics and Medical Information Institute Beijing University of TechnologyBeijing 100124China

BACKGROUND Radical D2 lymphadenectomy for advanced gastric cancer as a standard procedure has gained global consensus. Mounting studies have shown that the number of lymph nodes dissection directly affects the prognosis and recurrence of gastric cancer. Our previous study showed that there was no obvious lymph node around the abnormal hepatic artery derived from the superior mesenteric artery. AIM To investigate the relationship between celiac artery variation and the number of lymph nodes dissection in gastric cancer surgery. METHODS The clinicopathological data of 421 patients treated with radical D2 lymphadenectomy were analyzed retrospectively. The difference of the number of lymph nodes dissection between the celiac artery variation group and the normal vessels group and the relationship with prognosis were analyzed. RESULTS Celiac artery variation was found in 110 patients, with a variation rate of 26.13%. Celiac artery variation, tumor staging, and Borrmann typing were factors that affected lymph node clearance in gastric cancer, and the number of lymph nodes dissection in patients with celiac artery variation was significantly less than that of non-variant groups (P 0.05). Univariate and multiple Cox regression analysis showed that celiac artery variation was not a prognostic factor for gastric cancer (P > 0.05). Tumor staging, intraoperative bleeding, and positive lymph node ratio were prognostic factors for gastric cancer patients (all P < 0.05). CONCLUSION The number of lymph nodes dissection in patients with celiac artery variation was reduced, but there was no obvious effect on prognosis. Therefore, lymph nodes around the abnormal hepatic artery may not need to be dissected in radical D2 lymphadenectomy.

关键词： Gastric cancer Celiac artery variation Lymphadenectomy Number of lymph nodes Prognosis

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Endobronchial Ultrasound-guided Transbronchial Needle Aspiration Increases the Yield of Transbronchial Lung Biopsy for the Evaluation of Peribronchial Lesions

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Chinese Medical Journal 2017年第1期130卷 11-14页

作者： Cheng Chen chuan-Yong mu Mei-Qin Su Jing-Yu Mao Ye-Han Zhu Jian-An Huang Respiratory Department The First Affiliated Hospital of Soochow University Suzhou Jiangsu 215006 China Institute of Respiratory Diseases Soochow University Suzhou Jiangsu 215007 China

Background： Due to absence of visible endobronchial target, the diagnostic yield of flexible bronchoscopy for peribronchial lesions has been unsatisfactory. Convex probe endobronchial ultrasound （CP-EBUS） has allowed for performing real-time transbronchial needle aspiration （TBNA） of enlarged hilar and mediastinal lymph nodes and therefore could also be used as a means of diagnosing proximal peribronchial lesions. Methods： We retrospectively analyzed the results related to 72 patients who underwent CP-EBUS for peribronchial lesions without endobronchial involvement and adjacent to three-grade bronchi based on chest computed tomography （CT） scan. We recorded the images during EBUS as well as the diagnostic results of TBNA and conventional-transbronchial lung biopsy/brush （C-TBLB/b）, and final diagnoses were based on pathologic analysis and follow-up. Results： In all cases, the mass was able to be identified using EBUS in 97.2% patients （70/72） who were performed with EBUS-TBNA ＋ C-TBLB/b. Sixty-six patients had a final diagnosis, 80.0% patients （56/70） had malignancies, and 14.3% patients （10/70） had benign disease. In malignancies, the diagnostic yield of C-TBLB/b was 57.1% （32/56） and in EBUS-TBNA was 85.7% （48/56）, whereas pathologic diagnosis reached 94.6% when EBUS-TBNA was combined with C-TBLB/b. C-TBLB/b ＋ EBUS-TBNA also exhibited stronger potency of histolytic diagnosis for malignancies than either EBUS-TBNA or C-TBLB/b alone. Furthermore, there are data supporting the value of EBUS-TBNA for the diagnosis of benign lung disease. Conclusion： The combined endoscopic approach with EBUS-TBNA and C-TBLB/b is an accurate and effective method for the evaluation of peribronchial lesions, with better results than using each technique alone.

关键词： Endobronchial Ultrasound Transbronchial Needle Aspiration Peribronchial Lesions Transbronchial Lung Biopsy

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高质量发展条件下中国城市环境效率评价

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中国环境科学 2019年第6期39卷 2667-2677页

作者：曾贤刚牛木川中国人民大学环境学院

构建NSUSBM-SFA-NSUSBM-Tobit的4阶段分析框架,并基于中国213个城市的截面数据,运用NSUSBM模型,计算了可分离与不可分离假设下城市的环境效率,同时运用3阶段DEA模型,引入了自然因素.并使用Tobit模型,结合新发展理念,分析了城市环境效率... 详细信息

构建NSUSBM-SFA-NSUSBM-Tobit的4阶段分析框架,并基于中国213个城市的截面数据,运用NSUSBM模型,计算了可分离与不可分离假设下城市的环境效率,同时运用3阶段DEA模型,引入了自然因素.并使用Tobit模型,结合新发展理念,分析了城市环境效率的影响因素.研究表明,中国城市环境效率均值为0.49,整体效率不高,地区差异明显.对部分高质量发展城市而言,相对优异的自然环境在一定程度上弥补了管理低效率,其管理效率仍有较大的改进空间;对低质量发展城市而言,GDP与污染的不可分离性是造成环境效率低下的重要原因.创新能力对城市环境效率有模型的促进作用;第二产业比重与环境效率明显负相关,同时城乡差异越大,环境效率越低;政府的环境投资与环境规制有助于提高城市环境效率;开放和引进外资对城市环境效率有显著的提升效果;城镇化有助于提升环境效率.

关键词：高质量发展环境效率 NSUSBM模型三阶段DEA Tobit回归

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高质量发展下长江经济带生态效率及影响因素

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中国环境科学 2020年第2期40卷 906-918页

作者：曾贤刚牛木川中国人民大学环境学院北京100872

构建NSUSBM-SFA-NSUSBM-Tobit的4阶段分析框架,基于长江经济带2007~2016年107个城市的面板数据,运用全局DEA技术计算了不可分离假设下城市的生态效率,同时通过3阶段DEA模型,将自然因素引入效率测算中.使用Tobit模型,结合新发展理念,定... 详细信息

构建NSUSBM-SFA-NSUSBM-Tobit的4阶段分析框架,基于长江经济带2007~2016年107个城市的面板数据,运用全局DEA技术计算了不可分离假设下城市的生态效率,同时通过3阶段DEA模型,将自然因素引入效率测算中.使用Tobit模型,结合新发展理念,定量分析了高质量发展视角下城市生态效率的影响因素.研究表明,2007~2016年间,不考虑各城市环境差异时,长江经济带综合生态效率均值由0.288增至0.617,增幅114.24%,于2011年跨过了0.4的低质量发展阶段,但低于0.8的高质量发展标准,湖南省增速最快,涨幅213.85%;考虑环境差异后,长江经济带综合生态效率均值由0.150增至0.395,涨幅163.33%,其中上海市增速最快,涨幅311.52%,上海、江苏与浙江的综合效率在大部分年份排名前3位,江西、贵州与云南则排名后3位.创新、城乡协调、政府环境投资、引进外资与推进城镇化均有助于提升城市生态效率.

关键词：长江经济带生态效率高质量发展 SBM模型三阶段DEA Tobit回归

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混合式球罐三维参数化设计讨论

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石油化工设备 2015年第4期44卷 90-95页

作者：穆传冰北京首钢国际工程技术有限公司北京100043

利用三维参数化设计软件Inventor建立了混合式球罐的三维模型,找出决定球壳分瓣和主要零件的控制参数。利用该模型结果得出了球壳的几何尺寸,并与传统公式计算的结果进行了对比,对零部件的参数化设计和人孔凸缘的强度校核进行了相关讨论。

关键词：球罐混合式三维参数化设计

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