检索结果-南通市图书馆

Acta Metallurgica Sinica(English Letters) 2019年第5期32卷 607-617页

作者： Da-Zheng Zhang xiu-Hua Gao Lin-xiu Du Hong-Xuan Wang Zhen-Guang Liu ning-ning Yang R.D.K.Misra State Key Laboratory of Rolling and Automation Northeastern University Neptune Offshore Engineering Development Co. Ltd School of Material Science and Engineering Jiangsu University of Science and Technology Department of Metallurgical Materials and Biomedical Engineering University of Texas at El Paso

The corrosion behavior of high-strength steel used for flexible riser exposed to CO_(2-)saturated saline solution and CO_(2-) saturated vapor environments was studied through immersion experiment and electrochemical corrosion experiment. The corrosion behavior and mechanism of the tested steel were analyzed on the basis of corrosion kinetics, nature of corrosion products, corrosion product morphology, elemental distribution and polarization curves. The experimental results showed that the microstructure of the tested steel was bainitic microstructure. The corrosive activity of the tested steel exposed to CO_(2-) saturated vapor environment was significantly lower than that exposed to CO_(2-) saturated saline solution *** prolonging the exposure time, the corrosion rate gradually decreased, the corrosion heterogeneity increased, and the dimensions of FeCO_3 crystals gradually became small. At later stages of corrosion, the corrosion current density decreased significantly and the anodic Tafel slope increased, indicating that the corrosion process was strongly inhibited. The corrosion mechanism of low-alloy steel with bainitic microstructure was proposed based on experimental results.

关键词： Flexible riser High-strength bainitic steel CO2 corrosion Electrochemical behavior

在线全文

学校读者我要写书评

暂无评论

临水之亭与东汉临湘地区的水路管理

古代文明（中英文） 2025年第1期19卷 106-116,M0006页

作者：王猛西北大学历史学院陕西西安710127

五一简所见东汉临湘地区的临水之亭,既包括㢕亭、庾亭、阳马亭、西市亭、南亭等在内的正式设立的亭,也有沂口例亭、楮溪例亭、溪例亭、横溪例亭、欣例亭与漻例亭等灵活设置的例亭。临水之亭沿湘水与临湘内河分布,其中例亭所临河流基本上... 详细信息

五一简所见东汉临湘地区的临水之亭,既包括㢕亭、庾亭、阳马亭、西市亭、南亭等在内的正式设立的亭,也有沂口例亭、楮溪例亭、溪例亭、横溪例亭、欣例亭与漻例亭等灵活设置的例亭。临水之亭沿湘水与临湘内河分布,其中例亭所临河流基本上为临湘内河,这样的分布格局是由湘水水道与临湘内河不同的治安环境决定的。临水之亭的水路管理职能,主要体现在检查登记、维护治安与协助征税3个方面,在东汉基层社会治理中发挥着重要作用。

关键词：五一简临湘县临水之亭水路交通

Clinicopathological differences between patients with schistosomal appendicitis and non schistosomal appendicitis:A retrospectively study of past ten years

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

World Journal of Clinical Cases 2025年第2期13卷 24-32页

作者： Xiao-Yi Wang Yao Hao Zi-Jian Wang xiu-Liang Xu Jiang-Hua Yang Department of Infectious Diseases The First Affiliated of Wannan Medical CollegeWuhu 241001Anhui ProvinceChina

BACKGROUND Chronic schistosomiasis causes multiple organ and multiple system diseases,especially the digestive *** eggs are mainly deposited in the stomach,liver and colorectal,but a few eggs are deposited in the appendix and cause *** present,there are few studies on schistosomal *** To explore the differences in epidemiological,clinical and pathological characteristics between schistosomal appendicitis and non-schistosomal appendicitis over the past decade in order to assess the impact of schistosomiasis on *** The differences of general data,clinical data and laboratory examination data of patients with appendicitis from October 2013 to October 2023 were retrospectively *** patients were divided into two groups for *** were 136 patients in schistosomal appendicitis group and 5418 patients in non-schistosomal appendicitis *** Schistosomal appendicitis accounted for 2.45%of all patients with appendicitis,and the annual proportion in the past decade was 2.2%,2.9%,1.8%,1.9%,3.4%,3.1%,1.9%,1.6%,3%,2.6%,*** prevalence of schistosomal appendicitis was middle-aged and elderly males,with an average age of 61.73±15.335 *** main population of non-schistosomal appendicitis was middle-aged men,with an average age of 35.8±24.013 years(P<0.001).The distribution of pathological types of appendicitis was different between the two groups(P<0.001).The incidence of acute suppurative appendicitis in non-schistosomal appendicitis was higher than that in schistosomal appendicitis[odds ratio(OR)=0.504;95%confidence interval(CI):0.349-0.728;P<0.001].The proportion of acute attack of chronic appendicitis in schistosomal appendicitis was higher than that in non-schistosomal appendicitis(OR=2.614;95%CI:1.815-3.763;P<0.001).The proportion of schistosomal appendicitis patients complicated with colorectal cancer was higher than that of nonschistosomal appendicitis patients(OR=5.087;95%CI:1.427-

关键词： Schistosomal appendicitis Schistosomiasis Appendix Colorectal cancer Clinicopathological characteristics

Analysis of relationships between land surface temperature and land use changes in the Yellow River Delta

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

Frontiers of Earth Science 2018年第2期12卷 444-456页

作者： Jicai ning Zhiqiang GAO Ran meng Fuxiang XU meng GAO Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Yantai 264003 China Environmental & Climate Sciences Department Brookhaven National Laboratory Upton NY 11973 USA

This study analyzed land use and land coverchanges and their impact on land surface temperature usingLandsat 5 Thematic Mapper and Landsat 8 OperationalLand Imager and Thermal Infrared Sensor imagery of theYellow River Delta. Six Landsat images comprising twotime series were used to calculate the land surfacetemperature and correlated vegetation indices. The YellowRiver Delta area has expanded substantially because of thedeposited sediment carried from upstream reaches of theriver. Between 1986 and 2015, approximately 35% of theland use area of the Yellow River Delta has beentransformed into salterns and aquaculture ponds. Overall,land use conversion has occurred primarily from poorlyutilized land into highly utilized land. To analyze thevariation of land surface temperature, a mono-windowalgorithm was applied to retrieve the regional land surfacetemperature. The results showed bilinear correlationbetween land surface temperature and the vegetationindices （i.e., Normalized Difference Vegetation Index,Adjusted-Normalized Vegetation Index, Soil-AdjustedVegetation Index, and Modified Soil-Adjusted VegetationIndex）. Generally, values of the vegetation indices greaterthan the inflection point mean the land surface temperatureand the vegetation indices are correlated negatively, andvice versa. Land surface temperature in coastal areas isaffected considerably by local seawater temperature andweather conditions.

关键词： land surface temperature mono-window algo-rithm Yellow River Delta land use change vegetationindex

Microstructure and Properties of M40 Carbon Fibre Reinforced Mg-Re-Zr Alloy Composites

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

Journal of Materials Science & Technology 2009年第3期25卷 423-426页

作者： Gaohui Wu Meihui Song Ziyang xiu ning Wang Wenshu Yang School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

M40 carbon fibre reinforced rare earth magnesium alloy ZM6 composites with fibre volume fraction about 60% were fabricated by pressure infiltration method. The microstructure, interracial morphology, and precipitation were studied by scanning electron microscopy, transmission electron microscopy, and energy dispersive X- ray spectrometer. It was shown that the interfaces between Mg alloy and fibres were well bonded and free from cracks. The Mg12Nd phase was preferentially precipitated at the fibre/matrix interfaces, leading to the segregation of Nd at the interfaces and the dramatic decrease of Mg12Nd precipitation in the matrix far from interfaces. Crystal defects such as high-density dislocations and twins were observed in the matrix near the fibre/matrix interface. A high bending strength （1393 MPa） and elastic modulus （190 GPa） were achieved in M40/ZM6 composite.

关键词： Magnesium matrix composites Microstructure Dislocations Twin

High-resolution imaging through dynamic scattering media: Iterative optimization based on polarimetric characteristics

在线全文

学校读者我要写书评

暂无评论

Science China Technological Sciences 2025年第1期 82-84页

作者： meng XIANG Kai DENG Tianyu WANG Jinpeng LIU Xue DONG Teli XI Fei LIU Xiaopeng SHAO School of Optoelectronic Engineering Xidian University Xi'an Key Laboratory of Computational Imaging National Key Laboratory of Infrared Detection Technologies

High-resolution imaging through randomly dynamic scattered fields and highly scattered walls is an extensively sought-after capability with potential applications in various fields such as underwater imaging, biomedical imaging, and seeing through fog. Numerous methods have been proposed to unscramble object information from degraded scattered images, resulting in considerable improvements in image contrast in degraded scenarios [1].

关键词：

ENTERPRISE INTEGRATION PLATFORM BASED ON SERVICEORIENTED ARCHITECTURE

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2008年第3期21卷 36-40页

作者： meng Xiaojun ZHANG Xu ning Ruxin SONG Yu School of Mechanical and Vehicle Engineering Beijing Institute of Technology Beijing 100081 China Department of Scientific Research Taishan University Taian 271021 China School of Mechanical and Vehicle Engineenng Beijing Institute of Technology Beijing 100081 China

To achieve information integration, process integration and application integration of enterprise, an enterprise integration platform （EIP） based on service-oriented architecture （SOA） is built. The enterprise integration model depending on encapsulating the business processes as well as the enterprise applications by the neutral and standard web services is presented. The problem how to discover the existed enterprise resources and share them was resolved depending on the mechanism of publishing and discovering the services. The EIP is integrated closely with product lifecycle management （PLM） system so that the process integration as well as orchestration of the business process services is implemented by encapsulating the workflow engine of PLM system. Not only process integration and application integration, but also information integration based on the bill of material （BOM） conversion driven by process are achieved. Finally, an interpretive, qualitative case study on EIP is conducted for this research.

关键词： Enterprise integration platform (EIP) Service-oriented architecture (SOA) Information integration Process integration Application integration

Impact of exterior electron emission on the self-sustaining margin of hollow cathode discharge

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2020年第9期22卷 2-11页

作者： Tianhang meng Zhongxi ning Daren YU Harbin Institute of Technology Harbin 150001.People's Republic of China

Hollow cathode researches used to focus on the inner cavity or downstream plume,however,rarely on the gap between the throttling orifice plate and the keeper plate(T-K gap),which was found to impact the self-sustaining margin of hollow cathode discharge in this *** the lower margin,the main power deposition and electron emission and ionization regions would migrate from inner cavity and downstream plume to the T-K gap,in which case,the source and destination of each m A current therein matter for the self-sustaining *** the metal surfaces in the T-K gap with emissive materials proved effective in lowering the lower margin by supplementing auxiliary thermionic emission,compensating electron loss on cold absorbing walls and suppressing discharge *** doing so,the lower margin of a 4 A hollow cathode was lowered from 1 to 0.1-0.2 A,enabling it to couple with low power Hall thruster without extra keeper current.

关键词： hollow cathode self-sustained discharge secondary electron emission ionization oscillations thermionic emission

Direct and rapid detection of serum amino acid and monoamine neurotransmitters to assist the diagnosis of panic disorder

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第01期 377-384页

作者： Shiwen Liu Xuerui Wan meng Zhao Jiaqi Wang Weilan Wu Linlin You Yonggui Yuan Qian Xu Rong Gao Key Laboratory of Environmental Medicine Engineering Ministry of Education School of Public Health Southeast University Key Laboratory of Modern Toxicology of Ministry of Education Department of Hygienic Analysis and Detection School of Public HealthNanjing Medical University Department of Psychosomatics and Psychiatry Zhongda Hospital School of Medicine Southeast University

The measurement of amino acid and monoamine neurotransmitters（NTs） in serum plays a central role in the identification and monitoring of clinical panic disorder（PD）. However, the strong polarity and chemical heterogeneity of NTs make direct extraction and rapid detection extremely challenging. Herein, we developed a strategy that integrated solid phase extraction based on magnetic Fe3O4coated with polydopamine（Fe3O4@PDA） and direct analysis of mass spectrometry in real time（DART-MS） for quantification of 10 NTs. We systematically investigated the optimal conditions of this strategy to achieve good accuracy and precision. Compared with existing magnetic solid phase extraction methods for NTs detection in biological samples, this strategy could adsorb more targets while having similar adsorption efficiencies, and the total process time was reduced by an average of 69.42%. We rapidly determined the metabolic abnormality of 6 types of NTs in the serum of PD patients and demonstrated their diagnostic accuracy. In addition, an outstanding feature of PD in which tryptophan was more metabolized by the KYN pathway and the 5-hydroxytryptamine pathway was inhibited could be elucidated by this strategy. Our results highlighted the potential ability of Fe3O4@PDA coupled with DART-MS to assist in the clinical diagnosis of PD.

关键词：

同方期刊数据库

Comparative first-principles study of elastic constants of covalent and ionic materials with LDA,GGA,and meta-GGA functionals and the prediction of mechanical hardness

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2021年第12期64卷 2755-2761页

作者： XING WanDong meng FanYan ning JinLiang SUN JianWei YU Rong Department of Physics University of Science and Technology BeijingBeijing 100083China National Center for Electron Microscopy in Beijing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Physics and Engineering Physics Tulane UniversityNew OrleansLA 70118USA

Accurate prediction of single-crystal elastic constants is critical for materials design and for understanding phase transition and elastic interactions in *** this work,the accuracy of elastic constants calculated with three density functional approximations has been compared,including the local density approximation(LDA),the generalized gradient approximation(GGA),and the recently developed strongly constrained and appropriately normed(SCAN)*** results show that SCAN and PBE describe elastic constants better than *** strong correlation between the mechanical hardness and the stiffness of the softest eigenmode(SSE)has been given for above three density *** correlation is capable of predicting accurately the hardness of covalent,ionic,and mixed covalent-ionic crystals,and providing us a convenient indicator for the discovery of hard or superhard materials.

关键词： hardness indicator elastic constants stiffness of softest eigenmode superhard materials