检索结果-南通市图书馆

Study on the oxidation mechanism of Al-SiC composite at elevated temperature

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2077-2087页

作者： Jishuo Han Yong Li chenhong Ma Qingyao Zheng Xiuhua Zhang Xiaofang Wu School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Vesuvius Advanced Ceramics(China)Co. LtdSuzhou 215000China

Resin-bonded Al-SiC composite was sintered at 1100,1300,and 1500℃ in the air,the oxidation mechanism was *** reaction models were also *** oxidation resistance of the Al-SiC composite was significantly enhanced with temperature *** in the exterior of the composite was partially oxidized slightly,while the transformation of metastable Al_(4)C_(3) to stable Al_(4)SiC_(4) existed in the *** 1100℃,Al in the interior reacted with residual C to form Al_(4)C_(3).With increasing to 1300℃,high temperature and low oxygen partial pressure lead to active oxidation of SiC,and internal gas composition transforms to Al_(2)O(g)+CO(g)+SiO(g)as the reaction *** Al_(4)C_(3) is formed,CO(g)and SiO(g)are continuously deposited on its surface,transforming to Al_(4)SiC_(4).At 1500℃,a dense layer consisting of SiC and Al_(4)SiC_(4) whiskers is formed which cuts off the diffusion channel of *** active oxidation of SiC is accelerated,enabling more gas to participate in the synthesis of Al_(4)SiC_(4),eventually forming hexagonal lamellar Al_(4)SiC_(4) with mutual accumulation between SiC *** Al enhances the oxidation resistance of *** addition,the in situ generated non-oxide is uniformly dispersed on a micro-scale and bonds SiC stably.

关键词： Al-SiC composite kiln furniture Al_(4)SiC_(4) Al_(4)C_(3) oxidation mechanism

Research progress in tumor angiogenesis and drug resistance in breast cancer

在线全文

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2024年第7期21卷 571-585页

作者： Jiancheng Mou chenhong Li Qinghui Zheng Xuli Meng Hongchao Tang The Second Clinical Medical College Zhejiang Chinese Medical UniversityHangzhou 310053China Department of Breast Surgery General SurgeryCancer CenterZhejiang Provincial People's Hospital(Affiliated People's Hospital)Hangzhou Medical CollegeHangzhou 310053China Key Laboratory for Diagnosis and Treatment of Upper Limb Edema and Stasis of Breast Cancer Hangzhou310053China

Angiogenesis is considered a hallmark pathophysiological process in tumor development. Aberrant vasculature resulting from tumor angiogenesis plays a critical role in the development of resistance to breast cancer treatments, via exacerbation of tumor hypoxia, decreased effective drug concentrations within tumors, and immune-related mechanisms. Antiangiogenic therapy can counteract these breast cancer resistance factors by promoting tumor vascular normalization. The combination of antiangiogenic therapy with chemotherapy, targeted therapy, or immunotherapy has emerged as a promising approach for overcoming drug resistance in breast cancer. This review examines the mechanisms associated with angiogenesis and the interactions among tumor angiogenesis, the hypoxic tumor microenvironment, drug distribution, and immune mechanisms in breast cancer. Furthermore, this review provides a comprehensive summary of specific antiangiogenic drugs, and relevant studies assessing the reversal of drug resistance in breast cancer. The potential mechanisms underlying these interventions are discussed, and prospects for the clinical application of antiangiogenic therapy to overcome breast cancer treatment resistance are highlighted.

关键词： Angiogenesis breast cancer chemotherapy drug resistance vascular normalization immunologic therapy tumor microenvironment(TME)

Optimizing 3d spin polarization of CoOOH by in situ Mo doping for efficient oxygen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2024年第1期6卷 236-244页

作者： Zhichao Jia Yang Yuan Yanxing Zhang Xiang Lyu chenhong Liu Xiaoli Yang Zhengyu Bai Haijiang Wang Lin Yang Key Laboratory of Green Chemical Media and Reactions School of Chemistry and Chemical EngineeringCollaborative Innovation Center of Henan Province for Green Manufacturing of Fine ChemicalsMinistry of EducationHenan Normal UniversityXinxiangHenanChina School of Physics Henan Normal UniversityXinxiangHenanChina Oak Ridge National Laboratory Electrification and Energy Infrastructures DivisionOak RidgeTennesseeUSA Department of Mechanical and Energy Engineering Key Laboratory of Energy Conversion and Storage TechnologiesSouthern University of Science and TechnologyShenzhenGuangdongChina

Transition-metal oxyhydroxides are attractive catalysts for oxygen evolution reactions(OERs).Further studies for developing transition-metal oxyhydroxide catalysts and understanding their catalytic mechanisms will benefit their quick transition to the next ***,Mo-doped CoOOH was designed as a high-performance model electrocatalyst with durability for 20 h at 10 mAcm−***,it had an overpotential of 260 mV(glassy carbon)or 215 mV(nickel foam),which was 78 mV lower than that of IrO_(2)(338 mV).In situ,Raman spectroscopy revealed the transformation process of *** using the density functional theory showed that during OER,doped Mo increased the spin-up density of states and shrank the spin-down bandgap of the 3d orbits in the reconstructed CoOOH under the electrochemical activation process,which simultaneously optimized the adsorption and electron conduction of oxygen-related intermediates on Co sites and lowered the OER *** research provides new insights into the methodical planning of the creation of transition-metal oxyhydroxide OER catalysts.

关键词： electrocatalyst in situ Raman Mo-doped CoOOH oxygen evolution reaction

Yuzaoea gen. nov., a new biraphid diatom(Bacillariophyceae)genus and its phylogenetic significance

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

Acta Oceanologica Sinica 2024年第2期43卷 130-136页

作者： Honghan Liu chenhong Li Lang Li Xuesong Li Lin Sun Junrong Liang Jun Zhang Yahui Gao Changping Chen Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences Xiamen UniversityXiamen 361102China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China Guangxi Key Laboratory of Marine Environmental Science Guangxi Academy of Marine SciencesGuangxi Academy of SciencesNanning 530007China Beibu Gulf Marine Industry Research Institute Fangchenggang 538000China

The flexed frustules in pennate diatoms are usually associated with monoraphid diatoms. Interestingly, we found a biraphid diatom species with flexed frustules in an offshore intertidal beach environment on Weizhou Island,Beihai City, Guangxi Zhuang Autonomous Region, China. Therefore, based on morphological characteristics, we described a new genus of diatoms Yuzaoea sinensis gen. et sp. nov. CH Li, HH Liu, YH Gao & CP Chen. The frustule of this genus is characterized by heterogeneous frustule with one concave valve and one convex valve,complete raphe on both valves, straight and moderately eccentric raphe, uniseriate striae and girdle bands with a single row of areolae. The most identifying feature of this genus was the flexed frustule, which is rare in biraphid diatoms and common in monoraphid diatoms. We compared the morphometric characteristics of genus Yuzaoea with genus Rhoikoneis and several genera within the family Rhoicospheniaceae, including Rhoicosphenia,Campylopyxis, and Cuneolus. Phylogenetic analyses based on SSU rRNA and rbc L showed that the genus Yuzaoea was the sister group to the clade of Rhoicosphenia with a high support value(bootstrap values = 100%), and the clade “Yuzaoea+Rhoicosphenia” was sister to the clade of monoraphid diatoms, in which the genera Achnanthidium, Planothidium and some Cocconeis with high support values(bootstrap = 100%).Morphologically, the genus Yuzaoea shares many morphological features with monoraphid diatoms like genera Achnanthidium and Planothidium and the members within the Rhoicospheniaceae. Therefore, based on a combined morphological studies and phylogenetic results we suggested that this branch may represented the evolution of one kind monoraphid diatoms, from biraphid diatoms(e.g. genus Yuzaoea), to incompleted biraphid diatoms(e.g. genera Rhoicosphenia, Campylopyxis), to monoraphid diatoms(e.g. genera Achnanthidium and Planothidium).

关键词： biraphid diatom marine new genus Rhoicospheniaceae taxonomy Yuzaoea

Reconstruction characteristics of gut microbiota from patients with type 1 diabetes affect the phenotypic reproducibility of glucose metabolism in mice

在线全文

学校读者我要写书评

暂无评论

Science China Life Sciences 2024年

作者： Zhiyi Wang Mengxue Gong Yuanyuan Fang Huijuan Yuan chenhong Zhang State Key Laboratory of Microbial Metabolism School of Life Sciences and Biotechnology Shanghai Jiao Tong University Department of Endocrinology Henan Provincial People's Hospital People's Hospital of Zhengzhou University

The human microbiota-associated (HMA) mice model, especially the germ-free (GF)-humanized mice, has been widely used to probe the causal relationships between gut microbiota and human diseases such as type 1 diabetes (T1D). However, most studies have not clarified the extent to which the reconstruction of the human donor microbiota in recipient mice correlates with corresponding phenotypic reproducibility. In this study, we transplanted fecal microbiota from five patients with T1D and four healthy people into GF mice, and microbiota from each donor were transplanted into 10 mice. Mice with similar microbiota structure to the donor exhibited better phenotypic reproducibility. The characteristics of the microbial community assembly of donors also influenced the phenotypic reproducibility in mice, and individuals with a higher proportion of stochastic processes showed more severe disorders. Microbes enriched in patients with T1D had a stronger colonization potential in mice with impaired glucose metabolism, and microbiota functional features related to T1D were better reproduced in these mice. This indicates that assembly traits and colonization efficacy of microbiota influence phenotypic reproducibility in GF-humanized mice. Our findings provide important insights for using HMA mice models to explore links between gut microbiota and human diseases.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

某海底原油输送管线的内腐蚀风险评估

腐蚀与防护 2024年第4期45卷 81-85页

作者：李晨泓中海石油(中国)有限公司上海分公司上海200335

对于无法进行智能内检测的管道,急需通过科学的内腐蚀风险评估了解其腐蚀状况,从满足管道完整性管理的工作要求。通过内腐蚀直接评估和室内模拟试验,评价了目标海底管道内腐蚀风险,以合理评估管线服役可靠性,合理安排后续水下检测以及... 详细信息

对于无法进行智能内检测的管道,急需通过科学的内腐蚀风险评估了解其腐蚀状况,从满足管道完整性管理的工作要求。通过内腐蚀直接评估和室内模拟试验,评价了目标海底管道内腐蚀风险,以合理评估管线服役可靠性,合理安排后续水下检测以及其他检查资源的优先次序。评估结果表明该海管存在内腐蚀,但强度未受到显著影响,可按照目前条件,继续保持正常生产运行。

关键词：海管内腐蚀直接评价腐蚀预测模拟试验

在线全文

学校读者我要写书评

暂无评论

德国国土空间用途管制机制经验与启示

现代城市研究 2024年第1期39卷 76-82,124页

作者：夏陈红翟国方南京大学建筑与城市规划学院

德国作为空间规划思想的重要萌发地,其用途管制制度一直是世界各国学习的榜样。文章在梳理德国国土空间用途管制制度体系的框架结构,分析用途管制制度在总量控制与计划管理、空间准入与实施许可、规划监测与预警机制等环节运行机制的基... 详细信息

德国作为空间规划思想的重要萌发地,其用途管制制度一直是世界各国学习的榜样。文章在梳理德国国土空间用途管制制度体系的框架结构,分析用途管制制度在总量控制与计划管理、空间准入与实施许可、规划监测与预警机制等环节运行机制的基础上,总结德国在立法、立项、资金支持、空间监测、可持续发展与气候保护等领域的国土空间用途管制经验,希望能为我国国土空间用途管制制度的完善提供可借鉴的建议。

关键词：国土空间用途管制经验启示土地资源可持续利用德国

在线全文

学校读者我要写书评

暂无评论

俄侨杜劳在华的舞台美术活动及其影响

南京艺术学院学报（美术与设计） 2024年第4期 77-83页

作者：张磊计晨泓浦安原同济大学设计创意学院上海200090 俄罗斯圣彼得堡国立大学艺术史系圣彼得堡199034

本文聚焦民国时期俄侨杜劳在杭州、上海等地的舞台美术实践和教学项目,分析和探讨其舞台美学来源、创作手法演变和多领域贡献。本文指出,以杜劳为首的俄侨美术家和设计师率先将佳吉列夫舞台美学引入中国,他们的设计经验不仅在中国舞美... 详细信息

本文聚焦民国时期俄侨杜劳在杭州、上海等地的舞台美术实践和教学项目,分析和探讨其舞台美学来源、创作手法演变和多领域贡献。本文指出,以杜劳为首的俄侨美术家和设计师率先将佳吉列夫舞台美学引入中国,他们的设计经验不仅在中国舞美教学体系创建中占主导地位,而且是中国装饰艺术史和现代设计史不可或缺的一部分。

关键词：杜劳舞台美术布景设计上海俄罗斯芭蕾舞团

RESEARCH ON TURBULENT FLOW WITHIN THE VORTEX PUMP

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2004年第6期16卷 701-707页

作者： chenhong-xun ShanghaiInstituteofAppliedMathematicsandMechanics ShanghaiUniversityShanghai200072China

Based on the standard k-ε turbulence model and the RANS equations, thefinite volume method and the SIMPLE algorithm were adopted to carry out the three-dimensionalviscous numerical simulation of the internal flow within a vortex pump in double reference *** to the results of numerical simulation, the internal flow in the vortex pump was analyzed,and the calculated results of blade surface pressure of the impeller were compared withexperimental results. The maximum relative error is 6.6% between calculated value and experimentalvalue of the pump head under operation conditions.

关键词： vortex pump internal flow turbulence