检索结果-南通市图书馆

Degradation study on tin- and bismuth-based gas-diffusion electrodes during electrochemical CO_(2) reduction in highly alkaline media

引用

Journal of Energy Chemistry 2021年第11期30卷 367-376,I0008页

作者： Fabian Bienen armin lowe Joachim Hildebrand Sebastian Hertle Dana Schonvogel Dennis Kopljar Norbert Wagner Elias Klemm Kaspar Andreas Friedrich Institute of Engineering Thermodynamics German Aerospace CenterPfaffenwaldring 38-4070569 StuttgartGermany Institute of Building Energetics Thermal Engineering and Energy StorageUniversity of StuttgartPfaffenwaldring 3170569 StuttgartGermany Institute of Technical Chemistry University of StuttgartPfaffenwaldring 5570569 StuttgartGermany Institute of Engineering Thermodynamics German Aerospace CenterCarl-von-Ossietzky-Straße 1526129 OldenburgGermany

This work investigated the degradation of tin – based gas-diffusion electrodes (GDE) and also a promising Bi2O3 GDE in electrochemical CO_(2) reduction in highly alkaline media which has not been studied before. The contributions of the electrode wetting (or flooding, if excessively) and catalyst leaching on the degradation were analyzed. Therefore, electrochemical impedance spectroscopy was used to monitor the wetted surface area of the GDE in combination with post-mortem analysis of the penetration depth by visualizing the electrolyte’s cation in the GDE cross-section. Furthermore, to reveal a possible degradation of the electrocatalyst, its distribution was mapped in the GDEs cross-section after operation while the catholyte was additionally analyzed via ICP-MS. The results clearly demonstrate that the SnO_(2) catalyst dissolves in the reaction zone inside the GDE and might be partially redeposited near the GDEs surface. Since the redeposition process occurs only partially a steady loss of catalyst was observed impeding a clear distinction of the two degradation phenomena. Nevertheless, the deterioration of the electrode performance measured as faraday efficiency (FE) of the parasitic hydrogen evolution reaction (HER) qualitatively correlates with the differential double layer capacitance (Cdl). A significant difference of the rate of increase for the hydrogen FE and Cdl can be ascribed to the superposition of both above-mentioned degradation mechanisms. The demonstrated instability of SnO_(2) contrasts with the behavior of Bi2O3 GDE which is stabilized during CO_(2) conversion by redeposition of the diluted dissolved species as metallic Bi which is active for the CO_(2) reduction reaction.

关键词： Electrochemical CO_(2)reduction Heterogeneous catalysis Gas-diffusion electrode Electrochemical impedance spectroscopy Catalyst leaching

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

Cardiac Surgery at Yaoundé General Hospital by a Local Team: Activity Report from September 2022 to January 2024

引用

World Journal of Cardiovascular Surgery 2024年第6期14卷 87-94页

作者： Laurence Carole Ngo Yon Charles Mve Mvondo Hermann Nestor Tsague Kengni Zephanie Kobe Fokalbo Sépolin lowe Mireille Dakleu Alain Patrick Menanga William Ngatchou Djomo Vincent De Paul Djientcheu Department of Cardiothoracic and Vascular Surgery Yaound General Hospital Yaound Cameroon Department of Surgery and Specialities Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Department of Clinical Sciences Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Department of Clinical Sciences Faculty of Medicine and Biomedical Sciences University of Yaound Yaound Cameroon Department of Surgery and Specialities Faculty of Medicine and Biomedical Sciences University of Yaound Yaound Cameroon

Introduction: The practice of cardiac surgery (CS) in sub-Saharan Africa faces a number of challenges. We report on the surgical activities of the first 17 months of the program launched at the Yaoundé General Hospital (YGH), describing the types of interventions and the early results. Patients and Methods: This was a descriptive cross-sectional study including patients who underwent CS from September 2022 to January 2024 at the YGH. Clinical, operative and postoperative data were collected and analysed retrospectively by R software. Results: A total of 37 patients underwent CS during the study period, divided into 23 (62.2%) open-heart and 14 (37.8%) closed-heart cases. Males predominated (sex ratio 1.17). The median age and interquartile range (IQR) were 36 years (9 - 51). Isolated valve surgery, in 15 (40.5%) cases, was the most common procedure in open-heart surgery cases. Closed-heart surgery involved closure of the patent ductus arteriosus in 9 (24.3%) cases, coronary artery bypass grafting in 3 (8.1%) cases, and pericardectomy in 2 (5.4%) cases. The median duration of extracorporeal circulation and aortic cross-clamping was 101 min (IQR 84 - 143) and 74 min (IQR 54 - 112) respectively. The median duration of mechanical ventilation was 2 hours (IQR 2 - 3). The median intensive care unit stay and median hospital stay were 2 days (IQR 2 - 3) and 7 days (IQR 5 - 8) respectively. Operative mortality was 2 (5.4%). Conclusion: Cardiac surgery remains a major challenge for African populations. The early results achieved by the local team are satisfactory. An increase in surgical activity should be strongly encouraged to facilitate local training and ensure the sustainability of the activity.

关键词： Cardiac Surgery Sub-Saharan Africa Cameroon

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

Epstein-Barr virus and the origin of Hodgkin lymphoma

引用

Chinese Journal of Cancer 2014年第12期33卷 591-597页

作者： Martina Vockerodt Fathima Zumla Cader Claire Shannon-lowe Paul Murray School of Cancer Sciences University of Birmingham

Although Epstein-Barr virus(EBV)is present in the malignant Hodgkin/Reed-Sternberg(HRS)cells of a proportion of cases of classical Hodgkin lymphoma(c HL),how the virus contributes to the pathogenesis of this disease remains poorly *** is clear from the studies of other EBV-associated cancers that the virus is usually not sufficient for tumor development and that other oncogenic co-factors are *** article reviews what is known about the contribution of EBV to the pathogenesis of c HL and focuses on emerging evidence implicating chronic inflammation as a potential oncogenic co-factor in this malignancy.

关键词： Epstein-Barr病毒淋巴瘤起源金恶性肿瘤发病机制辅助因子 EBV

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

Estimation of premature forests in Georgia (USA) using *** Service FIA data and Landsat imagery

引用

Journal of Forestry Research 2017年第6期28卷 1241-1252页

作者： Hojung Kim Chris J. Cieszewski Roger C. lowe Warnell School of Forestry and Natural Resources University of Georgia 180 E. Green Street AthensGA 30602 USA

We used geographic information system applications and statistical analyses to classify young, premature forest areas in southeastern Georgia using combined data from Landsat TM 5 satellite imagery and ground inventory data. We defined premature stands as forests with trees up to 15 years old. We estimated the premature forest areas using three methods: maximum likelihood classification(MLC), regression analysis, and k-nearest neighbor(k NN)modeling. Overall accuracy(OA) of classifying the premature forest using MLC was 82% and the Kappa coefficient of agreement was 0.63, which was the highest among the methods that we have tested. The k NN approach ranked second in accuracy with OA of 61% and a Kappa coefficient of agreement of 0.22. Regression analysis yielded an OA of 57% and a Kappa coefficient of 0.14. We conclude that Landsat imagery can be effectively used for estimating premature forest areas in combination with image processing classifiers such as MLC.

关键词： Landsat Maximum likelihood classification Regression analysis k-nearest neighbor

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

Adult mouse model of early hepatocellular carcinoma promoted by alcoholic liver disease

引用

World Journal of Gastroenterology 2016年第16期22卷 4091-4108页

作者： Aditya Ambade Abhishek Satishchandran Benedek Gyongyosi Patrick lowe Gyongyi Szabo Department of Medicine University of Massachusetts Medical School

AIM: To establish a mouse model of alcohol-driven hepatocellular carcinoma (HCC) that develops in livers with alcoholic liver disease (ALD).METHODS: Adult C57BL/6 male mice received multiple doses of chemical carcinogen diethyl nitrosamine (DEN) followed by 7 wk of 4% Lieber-DeCarli diet. Serum alanine aminotransferase (ALT), alpha fetoprotein (AFP) and liver Cyp2e1 were assessed. Expression of F4/80, CD68 for macrophages and Ly6G, MPO, E-selectin for neutrophils was measured. Macrophage polarization was determined by IL-1β/iNOS (M1) and Arg-1/IL-10/CD163/CD206 (M2) expression. Liver steatosis and fibrosis were measured by oil-red-O and Sirius red staining respectively. HCC development was monitored by magnetic resonance imaging, confirmed by histology. Cellular proliferation was assessed by proliferating cell nuclear antigen (PCNA).RESULTS: Alcohol-DEN mice showed higher ALTs than pair fed-DEN mice throughout the alcohol feeding without weight gain. Alcohol feeding resulted in increased ALT, liver steatosis and inflammation compared to pair-fed controls. Alcohol-DEN mice had reduced steatosis and increased fibrosis indicating advanced liver disease. Molecular characterization showed highest levels of both neutrophil and macrophage markers in alcohol-DEN livers. Importantly, M2 macrophages were predominantly higher in alcohol-DEN livers. Magnetic resonance imaging revealed increased numbers of intrahepatic cysts and liver histology confirmed the presence of early HCC in alcohol-DEN mice compared to all other groups. This correlated with increased serum alpha-fetoprotein, a marker of HCC, in alcohol-DEN mice. PCNA immunostaining revealed significantly increased hepatocyte proliferation in livers from alcohol-DEN compared to pair fed-DEN or alcohol-fed ***: We describe a new 12-wk HCC model in adult mice that develops in livers with alcoholic hepatitis and defines ALD as co-factor in HCC.

关键词： Alpha-fetoprotein Macrophage polarization Steatohepatitis Proliferating cell nuclear antigen Liver tumor

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

Integrating the Climate Science Modelling Language with geospatial software and services

引用

International Journal of Digital Earth 2009年第S1期2卷 29-39页

作者： D.lowe A.Woolf B.Lawrence S.Pascoe Rutherford Appleton Laboratory British Atmospheric Data CentreDidcotUK Rutherford Appleton Laboratory STFC e-Science CentreDidcotUK

Much consideration is rightly given to the design of metadata models to describe *** the other end of the data-delivery spectrum much thought has also been given to the design of geospatial delivery interfaces such as the Open Geospatial Consortium standards,Web Coverage Service(WCS),Web Map Server and Web Feature Service(WFS).Our recent experience with the Climate Science Modelling Language shows that an implementation gap exists where many challenges remain *** bridge this gap requires transposing information and data from one world view of geospatial climate data to *** of the issues include:the loss of information in mapping to a common information model,the need to create‘views’onto file-based storage,and the need to map onto an appropriate delivery interface(as with the choice between WFS and WCS for feature types with coverage-valued properties).Here we summarise the approaches we have taken in facing up to these problems.

关键词： climate modelling schema standards data interoperability

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

Sorption and desorption behavior of residual antidepressants and caffeine in freshwater sediment and sewage sludge

引用

International Journal of Sediment Research 2022年第3期37卷 346-354页

作者： Ismael Laurindo Costa Junior Christiane Schinneider Machado Adelmo lowe Pletsch Yohandra Reyes Torres Department of Chemistry Federal University of Technology-Paraná (UTFPR) Department of Chemistry State University of Midwest (UNICENTRO)

The use of antidepressants is widespread in modern times. Thus, they present a potential risk for ecosystems due to occurrence in domestic sewage containing unaltered metabolites and structures, even after the treatment plants have processed the sewage. The current research investigated the sorption and desorption of antidepressants(citalopram, venlafaxine, fluoxetine, sertraline, and amitriptyline) and caffeine from freshwater sediment and sewage sludge. The samples of freshwater sediment were collected in a river spring in an area with few anthropogenic sources of pollution and samples of sewage sludge were taken from stabilization ponds of a sewage treatment. The matrices were mainly composed of organic fractions, sediment of humic nature, and aliphatic biomolecules in sludges. The presence of silt and clay in the sediment proved to be important for the sorption process when compared to the flocs and colloidal structure of the sludge. The kinetic study indicated pseudo-first order behavior. The Freundlich isotherm was satisfactorily used in the interpretation of sorption and desorption for all analytes and matrices. The high percentages obtained for desorption suggest analyte mobility, which is more intense in the sludge than in the sediment since each matrix has a different composition. It can be considered that the information obtained here reinforces the ecotoxicological concern with respect to pharmacological residues in the environment, as processes of retention by sorption in the sludge and the sediment have been confirmed, as well as the preferential partition of some analytes by the aqueous phase.

关键词： Emerging pollutants Drugs Persistence Partition Mobility Sorption

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Concentration-Dependent Solar Thermochemical CO_(2)/H_(2)O Splitting Performance by Vanadia-Ceria Multiphase Metal Oxide Systems

引用

Research 2020年第1期2020卷 522-533页

作者： Asim Riaz Muhammad Umair Ali T.Gabriel Enge Takuya Tsuzuki Adrian lowe Wojciech Lipinski Research School of Electrical Energy and Materials EngineeringThe Australian National UniversityCanberra ACT 2601Australia Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China Research School of Earth Sciences The Australian National UniversityCanberra ACT 2601Australia

The effects of V and Ce concentrations(each varying in the 0-100%range)in vanadia-ceria multiphase systems are investigated for synthesis gas production via thermochemical redox cycles of CO_(2) and H_(2)O splitting coupled to methane partial oxidation *** oxidation of prepared oxygen carriers is performed by separate and sequential CO_(2) and H_(2)O splitting *** and chemical analyses of the mixed-metal oxides revealed important information about the Ce and V interactions affecting their crystal phases and redox *** CeO_(2) and pure V_(2)O_(5) are found to offer the lowest and highest oxygen exchange capacities and syngas production performance,*** mixed-oxide systems provide a balanced performance:their oxygen exchange capacity is up to 5 times higher than that of pure CeO_(2) while decreasing the extent of methane *** addition of 25%V to CeO_(2) results in an optimum mixture of CeO_(2) and CeVO4 for enhanced CO_(2) and H_(2)O *** higher V concentrations,cyclic carbide formation and oxidation result in a syngas yield higher than that for pure CeO_(2).

关键词： pure methane splitting

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

Major depressive disorder and the gut microbiome:what is the link?

引用

General Psychiatry 2023年第1期36卷 67-69页

作者： Vania Modesto lowe Margaret Chaplin Deanna Sgambato Department of Psychiatry University of Connecticut Health CenterFarmingtonConnecticutUSA Farrell Treatment Center New BritainConnecticutUSA School of Health Sciences Quinnipiac UniversityNorth HavenConnecticutUSA

Introduction Major depressive disorder(MDD)manifests by persistent depressed mood,anhedonia,changes in sleep and appetite,fatigue,guilt as well as hopelessness and suicidality.1 MDD is quite prevalent and remains a leading cause of disease burden worldwide.2 Antidepressants in combination with psychotherapies are helpful but do not work for all persons with MDD.

关键词： depressed depress Major

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

Tackling heterogeneity in treatment-resistant breast cancer using a broad-spectrum therapeutic approach

引用

Cancer Drug Resistance 2022年第4期5卷 917-925页

作者： Leroy lowe J.William LaValley Dean W.Felsher Getting to Know Cancer(NGO) TruroNova Scotia B2N 1X5Canada Wellness Plan MD Ltd AustinTX 78759USA Division of Oncology Departments of Medicine and PathologyStanford UniversityCA CCSR 1105USA.

Tumor heterogeneity can contribute to the development of therapeutic resistance in cancer, including advancedbreast cancers. The object of the Halifax project was to identify new treatments that would address mechanisms oftherapeutic resistance through tumor heterogeneity by uncovering combinations of therapeutics that could targetthe hallmarks of cancer rather than focusing on individual gene products. A taskforce of 180 cancer researchers,used molecular profiling to highlight key targets responsible for each of the hallmarks of cancer and then findexisting therapeutic agents that could be used to reach those targets with limited toxicity. In many cases, naturalhealth products and re-purposed pharmaceuticals were identified as potential agents. Hence, by combining themolecular profiling of tumors with therapeutics that target the hallmark features of cancer, the heterogeneity ofadvanced-stage breast cancers can be addressed.

关键词： Breast cancer chemoresistance drug resistance targeted therapy

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

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：