检索结果-南通市图书馆

Simulation of gas-solid flow in sinter vertical cooling furnace

Journal of Iron and Steel Research International 2023年第11期30卷 2133-2142页

作者： Teng-fei Qi Hai-feng Li Jun-jie Sun Guo-jun Chen yong-jie zhang School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Key Laboratory for Ecological Metallurgy of Multi-Metallic Mineral(Ministry of Education) Northeastern UniversityShenyang110819LiaoningChina Technology Center Shanghai Meishan Iron and Steel Co.Ltd.Nanjing210039JiangsuChina Central Research Institute Baosteel Co.Ltd.Shanghai201900China

The velocity distribution of sinter and gas in vertical cooling furnace(VCF)has an important influence on gas-solid heat *** on the slot model of single hopper in the VCF of Meishan Iron and Steel Co.,Ltd.,the velocity and particle size distribution of sinter and the velocity and pressure distribution of gas were studied using a computational fluid dynamics-discrete element method model to obtain the gas-solid flow rule in the *** results showed that the velocity of sinter near the wall and the edge of vent cowl was lower than that in the rest of the same ***,the rectangular section of the vertical cooling furnace can be divided into a quasi-static zone,a plug flow zone and a convergent flow zone according to the flow velocity of the *** average particle size and the void fraction of sinter bed were distributed in"W"and"V"shape along the width direction,*** distribution of gas velocity in the furnace cavity was uneven,and the high-velocity area gradually changed from the center to the edge of the furnace cavity with the rise of *** the ratio of edge to center gas flow from 2.7∶1 to 0.7∶1 could improve the gas velocity,but could not change the gas velocity *** gas velocity distribution was more affected by the average particle size distribution of the sinter *** was suggested that measures need be taken to adjust it to improve the gas velocity distribution in the VCF.

关键词： Sinter Vertical cooling furnace Average particle size Void fraction Velocity distribution Gas distribution mode

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

Individualized nomogram improves diagnostic accuracy of stage Ⅰ-Ⅱ gallbladder cancer in chronic cholecystitis patients with gallbladder wall thickening

引用

Hepatobiliary & Pancreatic Diseases International 2016年第2期15卷 180-188页

作者： Di Zhou Jian-Dong Wang yong Yang Wen-Long Yu yong-jie zhang Zhi-Wei Quan Department of General Surgery Xinhua Hospital Shanghai Jiaotong University School of Medicine Shanghai 200092 China Department of Biliary Tract Surgery Ⅱ Eastern Hepatobiliary Surgery Hospital Second Military Medical University Shanghai 200438 China

BACKGROUND： Early diagnosis of gallbladder cancer（GBC） can remarkably improve the prognosis of patients. This study aimed to develop a nomogram for individualized diagnosis of stage Ⅰ-Ⅱ GBC in chronic cholecystitis patients with gallbladder wall ***： The nomogram was developed using logistic regression analyses based on a retrospective cohort consisting of 89 consecutive patients with stage Ⅰ-Ⅱ GBC and 1240 patients with gallbladder wall thickening treated at one biliary surgery center in Shanghai between January 2009 and December 2011. The accuracy of the nomogram was validated by discrimination, calibration and a prospective cohort treated at another center between January 2012 and December 2014（n=928）.RESULTS： Factors included in the nomogram were advanced age, hazardous alcohol consumption, long-standing diagnosed gallstones, atrophic gallbladder, gallbladder wall calcification, intraluminal polypoid lesion, higher wall thickness ratio and mucosal line disruption. The nomogram had concordance indices of 0.889 and 0.856 for the two cohorts, respectively. Internal and external calibration curves fitted well. The area under the receiver-operating characteristic curves of the nomogram was higher than that of multidetector row computed tomography in diagnosis of stage Ⅰ-Ⅱ GBC（P〈0.001）.CONCLUSION： The proposed nomogram improves individualized diagnosis of stage Ⅰ-Ⅱ GBC in chronic cholecystitis patients with gallbladder wall thickening, especially for those the imaging features alone do not allow to confirm the diagnosis.

关键词： chronic cholecystitis gallbladder wall thickening gallbladder cancer individualized diagnosis nomogram

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

Association between risk factors and retinal nerve fiber layer loss in early stages of diabetic retinopathy

引用

International Journal of Ophthalmology(English edition) 2021年第2期14卷 255-262页

作者： Zhong-Qi Wan Yan Gao Min Cui yong-jie zhang School of Public Health Nanjing Medical UniversityNanjing 211166Jiangsu ProvinceChina Department of Vitreoretinology Shanxi Eye HospitalTaiyuan 030005Shanxi ProvinceChina Department of Human Anatomy Nanjing Medical UniversityNanjing 211166Jiangsu ProvinceChina

AIM:To investigate the changes of retinal nerve fiber layer(RNFL)among normal individuals,diabetic patients without diabetic retinopathy(NDR)and non-proliferative diabetic retinopathy(NPDR),and explore the possible risk factors of early diabetic retinopathy(DR).METHODS:In this cross-sectional study,107 participants were divided in three *** 31 normal individuals(control group),40 diabetic patients without DR(NDR group)and 36 patients with NPDR(NPDR group)were *** coherence tomography(OCT)was used to detect RNFL thickness and other optic disc parameters among different *** potential association between RNFL loss and systemic risk factors were assessed for DR,including diabetes duration,body mass index(BMI),hemoglobin A1 c(Hb A1 c),serum lipids,and blood ***:The average and each quadrant RNFL thickness were thinner in NPDR group compared to control group of the right(P=0.00,P=0.01,P=0.01,P=0.02,P=0.04)and left eyes(P=0.00,P=0.00,P=0.00,P=0.03,P=0.04).The average,superior and inferior RNFL thickness were thinner in NDR group compared to the NPDR group of the right(P=0.00,P=0.02,P=0.03)and left eyes(P=0.00,P=0.00,P=0.01).Diabetic duration was negatively correlated with the superior,inferior,and average RNFL thickness of the right(r=-0.385,P=0.001;r=-0.366,P=0.001;r=-0.503,P=0.000)and left eyes(r=-0.271,P=0.018;r=0.278,P=0.015;r=-0.260,P=0.023).Hb A1 c was negatively correlated with the superior,inferior,and average RNFL thickness of the right(r=-0.316 P=0.005;r=-0.414,P=0.000;r=-0.418,P=0.000)and left eyes(r=-0.367,P=0.001;r=-0.250,P=0.030;r=-0.393,P=0.000).Systolic pressure was negatively correlated with the inferior and average RNFL thickness of the right eye(r=-0.402,P=0.000;r=-0.371,P=0.001)and was negatively correlated with the superior and average RNFL thickness of the left eye(r=-0.264,P=0.021;r=-0.233,P=0.043).CONCLUSION:RNFL loss,especially in the superior and inferior quadrants,may be the earliest structural change o

关键词： diabetic retinopathy RNFL less neurodegeneration risk factors optical coherence tomography

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

A versatile test bench for photomultiplier tube characterization and its application in the DAMPE-PSD

引用

Nuclear Science and Techniques 2016年第3期27卷 145-152页

作者： yong Zhou Zhi-Yu Sun Yu-Hong Yu yong-jie zhang Fang Fang Jun-Ling Chen Bi-Tao Hu Institute of Modern Physics Chinese Academy of Sciences509 Nanchang RoadLanzhou 730000China School of Nuclear Science and Technology Lanzhou University222 South Tianshui RoadLanzhou 730000China Graduate University of the Chinese Academy of Sciences 19A Yuquan RoadBeijing 100049China

Performance characterization for massive photomultiplier tubes(PMTs) is a frequently encountered procedure in large nuclear and particle *** facilitate this work,a dedicated test bench system has been developed at the Institute of Modern Physics,Chinese Academy of *** two-dimensional photocathode position scanning capability is an intrinsic function of the test bench,and up to 25 PMTs,with the diameter smaller than 2",can be tested *** parameters of the light source pulses can be adjusted in a wide range,thus making it suitable for various characteristics *** test bench system is highly automated with all the controlling operations integrated into a single ***,the hardware platform is extensible which allows complex testing schemes,and the modularity in the software design makes the migration from one testing configuration to another light-weight and *** these features make the test bench versatile and reusable in different *** has been first used in the construction of the Plastic Scintillator Detector(PSD) of DArk Matter Particle Explorer(DAMPE),and a total of 570 Hamamatsu R4443 tubes were tested *** performance was verified and the testing results are also reported in this article.

关键词：试验台架系统光电倍增管通用性特性性能试验台中国科学院院士测试方案粒子探测器

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

Soil organic carbon contents, aggregate stability,and humic acid composition in different alpine grasslands in Qinghai-Tibet Plateau

引用

Journal of Mountain Science 2016年第11期13卷 2015-2027页

作者： CAO Zhi-yuan WANG yong LI jie zhang Jin-jing HE Nian-peng Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

Alpine grassland soils on Qinghai-Tibet Plateau store approximately 33.5 Pg of organic carbon(C) at 0–0.75 m depth and play an important role in the global carbon *** investigated soil organic C(SOC),water-soluble organic C(WSOC),easily oxidizable organic C(EOC),humic C fractions,aggregate-associated C,aggregate stability,and humic acid(HA) composition along an east-west transect across Qinghai-Tibet Plateau,and explored their spatial patterns and controlling *** contents of SOC,WSOC,EOC,humic C fractions and aggregate-associated C,the proportions of macroaggregates(2-0.25) and micro-aggregates(0.25-0.053 mm),and the aggregate stability indices all increased in the order alpine desert < alpine steppe < alpine *** alkyl C,O-alkyl C,and aliphatic C/aromatic C ratio of HA increased as alpine desert < alpine meadow < alpine steppe,and the trends were reverse for the aromatic C and HB/HI *** annual precipitation and aboveground biomass weresignificantly correlated with the contents of SOC and its fractions,the proportions of macro- and microaggregates,and the aggregate stability indices along this *** all these C fractions,SOC content and aggregate stability were more closely associated with humic C and silt and clay sized C in comparison with WSOC,EOC,and macro- and microaggregate *** results suggested that alpine meadow soils containing higher SOC exhibited high soil aggregation and aggregate *** annual precipitation should be the main climate factor controlling the spatial patterns of SOC,soil aggregation,and aggregate stability in this *** resistant and stable C fractions rather than labile C fractions are the major determinant of SOC stocks and aggregate stability.

关键词： Soil organic carbon Aggregate stability Humic acid Carbon-13 nuclear magnetic resonance Latitudinal transect Qinghai-Tibet Plateau

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

ANALYSIS OF WATER QUALITY IN SHALLOW LAKES WITH A TWO-DIMENSIONAL FLOW-SEDIMENT MODEL

引用

Journal of Hydrodynamics 2007年第4期19卷 501-508页

作者： JI yong zhang jie YAO ei ZHAO Di-hua Nanchang Institute of Technology Nanchang 330099 China College of Environmental Science and Engineering Hohai University Nanjing 210098 China Nanjing Hydraulic Research Institute Nanjing 210098 China

The governing equation for sediment pollutions was derived based on the turbulent diffusion of pollutants in shallow lakes. Coupled with shallow water equations, a depth-averaged 2-D flow and water quality model was developed. By means of the conservation law, a proposed differential equation for the change of sediment pollutants was linked to the 2-D equations. Under the framework of the finite volume method, the Osher approximate Riemann solver was employed to solve the equations. An analytical resolution was used to examine the model capabilities. Simulated results matched the exact solutions especially well. As an example, the simulation of CODMn in the Wuli Lake, a part of the Taihu lake, was conducted, which led to reasonable results. This study provides a new approach and a practical tool for the simulation of flow and water quality in shallow lakes.

关键词： sediment falling velocity turbulence flow and water quality model finite volume method approximate Riemann solver shallow water equation advection-dispersion equation

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

The influence of stress-dependent overpotential on dendrite growth in all-solid-state battery with cracks

引用

Science China Technological Sciences 2024年第8期67卷 2493-2504页

作者： zhang ZhenHua zhang yong LIU Chang HOU Xu WANG jie Department of Engineering Mechanics School of Aeronautics and Astronautics Zhejiang University School of Aerospace Engineering and Applied Mechanics Tongji University Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and Aerospace Engineering Southwest Jiaotong University Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Zhejiang Laboratory Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University

Dendrite growth is one of the main challenges in maintaining the service life of all-solid-state lithium-ion batteries. Mechanical stress has been reported to significantly affect dendrite growth. In this study, to explain the effect of mechanical stress on electrochemical reactions in all-solid-state batteries, a modified phase-field model for dendrite growth is proposed by considering the stress-dependent overpotential. Dendrite growth under different mechanical loadings in an all-solid-state battery is investigated using the proposed model. Consistent with previous experimental results, the current result shows that compressive stress inhibits dendrite growth. Considering the stress concentration at the tips of processing-induced microcracks, the effects of the number and distribution of microcracks on dendrite growth are investigated. The results show that the stress-concentration field induced at the tips of cracks or voids can change the morphology of dendrites and decrease their growth rates. This study provides a new perspective for explaining Li dendrite growth under mechanical stress and offers inspiration for prolonging the service life of all-solid-state batteries based on defect and stress regulation, which may be further realized in experiments by filling solid electrolytes with different types of nanofillers.

关键词： Butler–Volmer equation stress-dependent overpotential microcracks all-solid-state battery phase-field simulation

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

Enriched environment boosts the post-stroke recovery of neurological function by promoting autophagy

引用

Neural Regeneration Research 2021年第5期16卷 813-819页

作者： Yi-Hao Deng Ling-Ling Dong yong-jie zhang Xiao-Ming Zhao Hong-Yun He Department of Basic Medicine Medical SchoolKunming University of Science and TechnologyKunmingYunnan ProvinceChina

Autophagy is crucial for maintaining cellular homeostasis,and can be activated after ischemic *** also participates in nerve injury and *** purpose of this study was to investigate whether an enriched environment has neuroprotective effects through affecting autophagy.A Sprague-Dawley rat model of transient ischemic stroke was prepared by occlusion of the middle cerebral artery followed by *** week after surgery,these rats were raised in either a standard environment or an enriched environment for 4 successive *** enriched environment increased Beclin-1 expression and the LC3-II/LC3-I ratio in the autophagy/lysosomal pathway in the penumbra of middle cerebral artery-occluded *** environment-induced elevations in autophagic activity were mainly observed in *** environment treatment also promoted the fusion of autophagosomes with lysosomes,enhanced the lysosomal activities of lysosomal-associated membrane protein 1,cathepsin B,and cathepsin D,and reduced the expression of ubiquitin and *** 4 weeks of enriched environment treatment,neurological deficits and neuronal death caused by middle cerebral artery occlusion/reperfusion were significantly alleviated,and infarct volume was significantly *** findings suggest that neuronal autophagy is likely the neuroprotective mechanism by which an enriched environment promotes recovery from ischemic *** study was approved by the Animal Ethics Committee of the Kunming University of Science and Technology,China(approval No.5301002013855)on March 1,2019.

关键词： autophagy brain central nervous system factor injury pathways protection regeneration repair stroke

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

Gas release characteristics during carbonization of iron coke hot briquette and influence of heating rate

引用

Journal of Iron and Steel Research International 2023年第11期30卷 2163-2172页

作者： Zi-yu Wang Dong Han Zheng-gen Liu Man-sheng Chu yong-jie zhang Li-feng zhang Ji-wei Bao Ming-yu Wang School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Engineering Research Center of Frontier Technologies for Low-Carbon Steelmaking(Ministry of Education) Shenyang110819LiaoningChina Liaoning Province Engineering Research Center for Technologies of Low-Carbon Steelmaking Shenyang110819LiaoningChina

The release characteristics of CH_(4),H_(2),CO and CO_(2) from iron coke hot briquette(ICHB)during carbonization were *** results show that compared with briquette without iron ore,Fe_(3)O_(4) can inhibit the release rate of H2 and promote the production of CO and CO_(2).In addition,when the heating rate increases from 3 to 7℃/min,the release rates of CH4 and H2 increase,while the release rates of CO and CO_(2) first increase and then *** carbonization process of ICHB was segmented,and corresponding kinetic analysis was carried *** results show that the activation energy of StageⅡand StageⅣis higher in the carbonization process of ICHB,and the active pyrolysis of coal and the reduction of iron ore occur in these two *** addition,the effect of heating rate on the kinetic parameters of ICHB carbonization process was *** was found that when the heating rate increased,the reaction activation energy of StageⅣdecreased first and then increased,which was consistent with the release law of CO and CO_(2).The analysis showed that the increase in heating rate leads to more reactions at higher temperatures,resulting in an increase in the release rate of some *** addition,thermal hysteresis can also cause some processes to fail to fully react at the end of *** is also found that the apparent activation energy and preexponential factor have kinetic compensation effect during the car-bonization of ICHB.

关键词： Iron coke hot briquette Carbonization Gas release characteristic Heating rate Kinetics

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

Simultaneous Identification of Process Structure, Parameters and Time-delay Based on Non-negative Garrote

引用

International Journal of Automation and computing 2020年第6期17卷 873-882页

作者： Jian-Guo Wang Qian-Ping Xiao Tiao Shen Shi-Wei Ma Wen-Tao Rao yong-jie zhang School of Mechatronical Engineering and Automation Shanghai UniversityShanghai Key Lab of Power Station Automation TechnologyShanghai 200072China Institute of Environment and Resources Baosteel Research InstituteShanghai 201900China

In practice,the model structure,parameters and time-delay of the actual process may vary ***,the general identification methods of the 3 items are performed with separate procedures which is very inconvenient in practical *** view of the fact that variable selection procedure can ensure a compact model with robust input-output,relation and in order to explore the feasibility of variable selection algorithm for the simultaneous identification of process structure,parameters and time-delay,non-negative garrote(NNG)algorithm is introduced and applied to system identification and the corresponding procedures are *** application of NNG variable selection algorithm to the identification of single input single output(SISO)system,multiple input multiple output(MIN1O)system and Wood-Berry tower industry are *** identification accuracy and the time-series variable selection results are analyzed and compared between NNG and ordinary least square(OLS)*** derived excellent results show that the proposed NNG-based modeling algorithm can be utilized for simultaneous identification of the model structure,parameters and time-delay with high precision.

关键词： Model structure model parameter time-delay non-negative garrote variable selection.

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

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：