检索结果-南通市图书馆

Petroleum Science 2024年第2期21卷 1257-1274页

作者： En-Bin Liu Shen Huang Ding-Chao Tian Lai-Min Shi Shan-Bi Peng he zheng Petroleum Engineering School Southwest Petroleum UniversityChengdu 610500SichuanChina Chongqing Natural Gas Sales Center Natural Gas BranchSinopecChongqing400023China Zhejiang Zheneng Natural Gas Operation Co. Ltd.Hangzhou 310000ZhejiangChina School of Civil Engineering and Architecture Southwest Petroleum UniversityChengdu 610500SichuanChina Louisiana Tech Univ Trenchless Technol Ctr599 Dan Reneau DrRustonLA71270USA Southwest Oil and Gas Field Branch Natural Gas Research Institute Chengdu 610213SichuanChina

During the production period of shale gas, proppant particles and rock debris are produced together,which will seriously erode the elbows of gathering pipelines. In response to this problem, this paper takes the elbow of the gathering pipeline in the Changning Shale Gas Field as an example to test the erosion rate and material removal mechanism of the test piece at different angles of the elbow through experiments and compares the four erosion models with the experimental results. Through analysis, it is found that the best prediction model for quartz sand-carbon steel erosion is the Oka model. Based on the Oka model, FLUENT software was used to simulate and analyze the law of erosion of the elbow of the gas gathering pipeline under different gas flow velocities, gas gathering pressure, particle size, length of L1,and bending directions of the elbow. And a spiral pipeline structure is proposed to reduce the erosion rate of the elbow under the same working conditions. The results show that this structure can reduce erosion by 34%.

关键词： Shale gas Gas gathering pipeline Elbow Erosion CFD

Opportunities and challenges of high-entropy materials in lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第10期43卷 4884-4902页

作者： Tong-Yue Xu Huai-Wei Feng Wei Liu Yan Wang Hong-he zheng College of Energy&Jiangsu Key Laboratory of Advanced Negative Carbon Technologies& Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow University NARI Technology Co. Ltd.

Lithium-ion batteries(LIBs) currently occupy an important position in the energy storage market, and the development of advanced LIBs with higher energy density and power density, better cycle life and safety is a hot topic for both academia and industry. In recent years, high-entropy materials(heMs) with complex stoichiometric ratios have attracted great attention in the field of LIBs due to their various promising functional properties. The adjustability and synergistic effects of multiple elements in heMs make them possible to break through the bottleneck of traditional electrode materials and electrolytes, providing new opportunities for the development of high-performance LIBs. This article provides an overview of the opportunities and challenges of heMs in LIBs, including cathodes, anodes and electrolytes. The progress of heMs in LIBs is first summarized and analyzed, then the potential advantages and limitations of heMs used in LIBs are concluded, finally some envisioned solutions are proposed to develop more advanced LIBs through heMs.

关键词： Lithium-ion batteries

Effects of Different Culture Conditions and Growth States on the Structure and hemostatic Properties of Coscinodiscus sp.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2024年第4期23卷 1121-1134页

作者： he zheng LI Qinfeng LIU Jinfeng HUI Guangyan FENG Chao CheNG Xiaojie CheN Xiguang College of Marine Life Science Sanya Oceanographic InstitutionOcean University of ChinaQingdao 266003China Laboratory for Marine Drugs and Bioproducts Qingdao Marine Science and Technology CenterQingdao 266237China Department of Stomatology Qingdao Women and Children’s HospitalQingdao 266034China Department of Stomatology Qingdao Special Servicemen Recuperation Center of PLA NavyQingdao 266071China

As a renewable marine inorganic material,Coscinodiscus *** significant potential in the field of rapid ***,the low yield of Coscinodiscus *** limits the *** this study,two new culture modes were adopted to increase the production of Coscinodiscus sp.,the effect of changes in culture conditions and growth status on the hemostatic activity of diatoms was *** prevent Coscinodiscus *** sinking in culture,the suspension culture mode was realized by adding0.5%*** semi-continuous high nutrient concentration culture mode increased the cell density of Coscinodiscus *** 11000cells mL^(-1)and shorten the culture cycle to 5 *** terms of coagulation activity,the addition of frustules reduced the in vitro coagulation time by half and the activation time of coagulation by 70%.The hemolysis rate and cytotoxicity of frustules harvested in the two culture modes did not change *** results showed that suspension culture mode and high nutrient concentration culture mode only changed the growth state of Coscinodiscus sp.,while the hemostatic performance remained stable.

关键词： diatom culture Coscinodiscus sp frustule hemostatic material hemorrhage control

A Gasification Technology to Combine Oil Sludge with Coal-Water Slurry:CFD Analysis and Performance Determination

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2024年第7期20卷 1481-1498页

作者： Xulei Wu Hailong Yu Panrong Wu Chaoqian Wang Haiqun Chen Yunlan Sun he zheng School of Petroleum Engineering Changzhou UniversityChangzhouChina Sinopec East China Petroleum Engineering Company NanjingChina

The development of more environment-friendly ways to dispose of oil sludge is currently regarded as a hot *** this context,gasification technologies are generally seen as a promising way to combine oil sludge with coal–water slurry(CWS)and generate resourceful *** this study,a novel five-nozzle gasifier reactor was analyzed by means of a CFD(Computational fluid dynamic)*** several influential factors,special attention was paid to the height-to-diameter ratio of the gasifier and the mixing ratio of oil sludge,which are known to have a significant impact on the flow field,temperature distribution and gasifier *** to the numerical results,the optimal height-to-diameter ratio and oil mixing ratio are about 2.4:1 and 20%,***,the carbon conversion rate can become as high as 98.55%with the hydrolysis rate reaching a value of 53.88%.The consumption of raw coal and oxygen is generally reduced,while the effective gas production is increased to 50.93 mol/%.

关键词： Oil sludge coal water slurry gasification numerical simulation fluent

A novel complex-high-order graph convolutional network paradigm:ChyGCN

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

Chinese Physics B 2024年第5期33卷 665-672页

作者：郑和翔苗书宇顾长贵 Business School University of Shanghai for Science and TechnologyShanghai 200093China Ant Group Shanghai 200000China

In recent years,there has been a growing interest in graph convolutional networks(GCN).However,existing GCN and variants are predominantly based on simple graph or hypergraph structures,which restricts their ability to handle complex data correlations in practical *** limitations stem from the difficulty in establishing multiple hierarchies and acquiring adaptive weights for each of *** address this issue,this paper introduces the latest concept of complex hypergraphs and constructs a versatile high-order multi-level data correlation *** model is realized by establishing a three-tier structure of ***,we start by establishing hyperedge clusters on a foundational network,utilizing a second-order hypergraph structure to depict potential *** this second-order structure,truncation methods are used to assess and generate a three-layer composite *** the construction of the composite structure,an adaptive learning strategy is implemented to merge correlations across different *** evaluate this model on several popular datasets and compare it with recent state-of-the-art *** comprehensive assessment results demonstrate that the proposed model surpasses the existing methods,particularly in modeling implicit data correlations(the classification accuracy of nodes on five public datasets Cora,Citeseer,Pubmed,Github Web ML,and Facebook are 86.1±0.33,79.2±0.35,83.1±0.46,83.8±0.23,and 80.1±0.37,respectively).This indicates that our approach possesses advantages in handling datasets with implicit multi-level structures.

关键词： raph convolutional network complex modeling complex hypergraph

Construction of N-doped copper metal–organic frameworks for promoting photocatalytic carbon dioxide reduction to ethylene

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年

作者： Fan Guo Zong-zheng he Peng Wang Xiao-Yu Zhang Hongjian Yu Qin-Chao Wang Wei-Yin Sun School of Chemistry and Chemical Engineering Yangzhou University Coordination Chemistry Institute State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing National Laboratory of Microstructures Collaborative Innovation Center of Advanced Microstructures Nanjing University

Engineering nonmetallic atom-doped metal-organic framework （MOF） catalyst to promote C-C coupling and realize conversion of CO2into C2 multi-carbon hydrocarbon products is still ***,with 2-methylimidazole as a dopant of N element,an N-doped NH2-CuBDC catalyst was obtained via a facile and simple stirring *** illumination,compared with catalytic CO2reduction to C1 product of CO by original MOF,N-doped NH2-CuBDC can motivate generation of C2H4,which is difficult to achieve in photocatalytic system by MOF-based *** transfer rates of photo-generated charges have been expedited due to the high electron density around Cu catalytic sites after *** importantly,C–C coupling intermediate CO–CHO*was identified by in situ Fourier transform infrared spectroscopy during the catalytic CO2reduction reaction process,which further indicates the presence of Cu–N sites in the NH2-CuBDC can facilitate the formation of *** work uncovers a new paradigm to design photocatalysts for enhancing the reduction of CO2to C2 products.

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

毛泽东塑造新中国形象的叙事话语分析

湘潭大学学报（哲学社会科学版） 2024年第1期48卷 10-16页

作者：贺政凯清华大学马克思主义学院北京100084

新中国成立后,毛泽东出于争取国际社会对新中国的承认与支持、创造有利于社会主义建设的国际环境、维护世界和平与推动人类解放事业等多重考量,在不同意识形态交锋的现实语境下,身体力行地向国际社会宣介中国主张,全面展现新中国的真实... 详细信息

新中国成立后,毛泽东出于争取国际社会对新中国的承认与支持、创造有利于社会主义建设的国际环境、维护世界和平与推动人类解放事业等多重考量,在不同意识形态交锋的现实语境下,身体力行地向国际社会宣介中国主张,全面展现新中国的真实形象,形成了塑造新中国形象的叙事话语体系。毛泽东在塑造新中国形象的多重叙事中,阐释“革命与解放”的历史进程,明晰“中国与世界”的关系走向,描绘“建设与发展”的光明前景,形成了以尊重个性与增进共性为基础,以理论分析与事实佐证为原则,以历时演进与共时联系为逻辑,以主体表达与双向互动为方式的叙事方法。

关键词：毛泽东新中国国家形象叙事话语

在线全文

学校读者我要写书评

暂无评论

船舶建造企业ESG评价框架及指标

船海工程 2024年第3期53卷 60-63页

作者：郑和辉招商局金陵船舶(威海)有限公司山东威海264200

通过分析现有企业ESG(环境、社会、公司治理)评价框架和评价指标,指出其在船舶建造行业中的局限性。基于船舶建造企业的特性和需求,提出富有针对性、具象化的ESG评价体系,确定一系列关键评价指标。结合实际研究案例,论证该评价体系的有... 详细信息

通过分析现有企业ESG(环境、社会、公司治理)评价框架和评价指标,指出其在船舶建造行业中的局限性。基于船舶建造企业的特性和需求,提出富有针对性、具象化的ESG评价体系,确定一系列关键评价指标。结合实际研究案例,论证该评价体系的有效性和适用性,以及关键评价指标的合理性,帮助企业更好地理解和管理ESG问题。本研究的结果不仅为船舶建造企业提供一个针对性的ESG评价工具,还为其可持续发展提供重要参考。

关键词： ESG 评价框架关键评价指标船舶建造企业可持续发展

揭示氨对正己酸生产影响的机制——影响途径、关键酶和微生物

在线全文

学校读者我要写书评

暂无评论

Engineering 2024年第4期35卷 180-190页

作者： Qing-Lian Wu Ke-Xin Yuan Wei-Tong Ren Lin Deng Hua-Zhe Wang Xiao-Chi Feng he-Shan zheng Nan-Qi Ren Wan-Qian Guo State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China College of Architecture and Environment Sichuan UniversityChengdu 610065China State Key Laboratory of Urban Water Resource and Environment School of Civil and Environmental EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China College of Chemistry and Chemical Engineering Qiqihar UniversityQiqihar 161006China

n-Caproate,which is produced via chain elongation(CE)using waste biomass,can supply various fossilderived products,thus advancing the realization of carbon *** released from the degradation of nitrogen-rich waste biomass can act as a nutrient or an inhibitor in anaerobic bioprocesses,including CE,with the distinction being primarily dependent on its ***,the optimal concentration of ammonia and the threshold of toxicity for open-culture n-caproate production using ethanol as an electron donor,along with the underlying mechanisms,remain *** study revealed that the optimal concentration of ammonia for n-caproate production was 2.0 g∙L^(-1),whereas concentrations exceeding this threshold markedly suppressed the CE *** of the mechanism revealed the involvement of two forms of ammonia(i.e.,ammonium ions and free ammonia)in this inhibitory *** ammonia levels(5.0 g∙L^(-1))induced excessive ethanol oxidation and suppressed the reverse β-oxidation(RBO)process,directly leading to the enhanced activities of enzymes(phosphotransacetylase and acetate kinase)responsible for acetate formation and diminished activities of butyryl-coenzyme A(CoA):acetyl-CoA transferase,caproyl-CoA:butyryl-CoA transferase,and caproyl-CoA:acetyl-CoA transferase that are involved in the syntheses of n-butyrate and ***,the composition of the microbial community shifted from Paraclostridium dominance(at 0.1 g∙L^(-1)ammonia)to a co-dominance of Fermentimonas,Clostridium sensu stricto 12,and Clostridium sensu stricto 15 at 2.0 g∙L^(-1)***,these CE-functional bacteria were mostly absent in the presence of excessive ammonia(5.0 g∙L^(-1)ammonia).Metagenomic analysis revealed the upregulation of functions such as RBO,fatty acid synthesis,K^(+)efflux,adenosine triphosphatase(ATPase)metabolism,and metal cation export in the presence of 2.0 g∙L^(-1)ammonia,collectively contributing to enhanced n-caproate produc

关键词： Ammonia inhibition Medium chain fatty acids n-Caproate Enzyme Metagenomics

在线全文

学校读者我要写书评

暂无评论

基于支持向量机和关联成像的分类方法研究

激光与光电子学进展 2024年第10期61卷 153-157页

作者：吴逸华何峥赵生妹南京邮电大学通信与信息工程学院信号处理与传输研究院江苏南京210003

针对未知物体的分类问题,提出了一种基于支持向量机和关联成像的分类方法。该方法利用线性判别分析法提取出物体的特征向量,并根据该特征向量设计出应用于关联成像系统的特征散斑,将特征散斑照射物体获得桶探测器值,支持向量机可以依据... 详细信息

针对未知物体的分类问题,提出了一种基于支持向量机和关联成像的分类方法。该方法利用线性判别分析法提取出物体的特征向量,并根据该特征向量设计出应用于关联成像系统的特征散斑,将特征散斑照射物体获得桶探测器值,支持向量机可以依据桶探测器值进行判别从而获得物体的类别。该方法的可行性在MNIST数据集上得到了验证,结果表明,该方法在10个分类任务中均可取得较高的分类准确率,平均分类准确率达90.5%。与其他分类方法的对比结果表明,所提方法在准确率上更具优势。

关键词：关联成像线性判别分析机器学习支持向量机