检索结果-南通市图书馆

中国珍稀濒危保护植物在江苏省的自然分布及其特点

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

生物多样性 2000年第2期8卷 153-162页

作者：郝日明黄致远刘兴剑王中磊徐惠强姚志刚江苏省中国科学院植物研究所南京210014 江苏省农林厅林业局南京210013

讨论了 17种中国珍稀濒危植物在江苏省的自然分布及其特点 ,它们分别为小叶银缕梅 (Par rotiasubaequalis)、宝华玉兰 (Magnoliazenii)、天目木兰 (Magnoliaameona)、秤锤树 (Sinojackiaxylo carpa)、明党参 (Changiumsmyrnioides)、珊瑚菜 (Glehnialittoralis)、独花兰 (Changnieniaamoena)、香果树 (Emmenopteryshenryi)、中华水韭 (Isotessinensis)、水蕨 (Ceratopteristhalictroides)、金钱松 (Pseudolar ixamabilis)、短穗竹 (Brachystachyumdensiflorum)、野大豆 (Glycinesoja)、琅琊榆 (Ulmuschenmoui)、青檀 (Pteroceltistatarinowii)、榉树 (Zelkovaschneideriana)、香樟 (Cinnamomumcamphora)。上述 17种植物隶属 13科 16属 ,所包含的分类群多样性程度高 ,且小叶银缕梅、香果树、秤锤树、金钱松等为系统位置孤立的单种属或寡种属。这些物种大多分布在苏南 ,人类生产活动引起的生境片断化、地处分布区北缘具有的边缘效应 ,加上人类的砍伐 ,使原生境遭到严重破坏 ,种群个体数量稀少 ,物种处于严重濒危状态。

关键词：珍稀濒危植物植物保护自然分布江苏分布特点

Integrated medical resource consumption stratification in hospitalized patients:an Auto Triage Management model based on accurate risk,cost and length of stay prediction

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2022年第5期65卷 988-999页

作者： Qin zhong Zongren Li Wenjun wang lei Zhang Kunlun He Medical Big Data Research Center Chinese PLA General HospitalBeijing 100853China Medical Artificial Intelligence Research Center Chinese PLA General HospitalBeijing 100853China Bio-engineering Research Center Chinese PLA General HospitalBeijing 100039China Department of Cardiology Fourth Medical Center of Chinese PLA General HospitalBeijing 100048China Key Laboratory of Ministry of Industry and Information Technology of Biomedical Engineering and Translational Medicine Chinese PLA General HospitalBeijing 100048China China-Australia Joint Research Center for Infectious Diseases School of Public HealthXi’an Jiaotong University Health Science CenterXi’an 710061China

Triage management plays important roles in hospitalized patients for disease severity stratification and medical burden *** progression risks have been extensively researched for numbers of diseases,other crucial indicators that reflect patients’economic and time costs have not been systematically *** address the problems,we developed an automatic deep learning based Auto Triage Management(ATM)Framework capable of accurately modelling patients’disease progression risk and health economic *** on them,we can first discover the relationship between disease progression and medical system cost,find potential features that can more precisely aid patient triage in resource allocation,and allow treatment plan searching that has cured *** ATM in COVID-19,we built a joint model to predict patients’risk,the total length of stay(Lo S)and cost when at-admission,and remaining Lo S and cost at a given hospitalized time point,with C-index0.930 and 0.869 for risk prediction,mean absolute error(MAE)of 5.61 and 5.90 days for total Lo S prediction in internal and external validation data.

关键词： patient triage AutoML electronic medical records

在线全文

学校读者我要写书评

暂无评论

气囊压缩性能有限元分析及实验研究

弹性体 2010年第1期20卷 8-12页

作者：程钢王卫东史宝军王忠雷山东建筑大学机电工程学院山东济南250101 山东大学工程力学系山东济南250061

测量了气囊在压缩变形过程中承载力、内压和压缩高度变化之间的关系,建立了气囊的三维有限元模型,模拟了气囊受均布内压和压缩工况。通过实验及有限元取得的结果来了解气囊的力学性能,对于产品设计、气囊力学分析具有重要的实际指导意义。

关键词：气囊橡胶/帘线复合材料力学性能实验有限元分析

Experimental investigation on frictional properties of stressed basalt fractures

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2023年第6期15卷 1457-1475页

作者： Zhen zhong Congqiang Xu lei wang Yunjin Hu Fengshou Zhang School of Civil Engineering Shaoxing UniversityShaoxing312000China Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province Shaoxing UniversityShaoxing312000China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China

The frictional strength and sliding stability of faults are crucial in interpreting earthquake mechanisms and ***,we report friction experiments on basalt fractures,using a self-designed triaxial apparatus that allows direct shear of samples under coupled hydro-mechanical ***(VS)and slide-hold-slide(SHS)experiments are performed on both bare and gouge-bearing surfaces of Xiashan basalt subjected to cyclic shear velocities at 1e30 mm/s,effective normal stresses of 1e5 MPa,and pore pressures of 70e300 *** measured basalt friction coefficients are in the range of 0.67e0.74,which is sensitive to gouge thickness,normal stress,and ***,a reduction in friction coefficient is observed with an increment in gouge thickness,normal stress,and pore *** on the microscopic observation of the pre-and post-shearing sliding surfaces,this weakening effect in friction coefficient can be attributed to powder ***,the VS test results reveal predominantly velocity-strengthening behavior at investigated slip velocities,and this velocity strengthening behavior does not appear to be influenced by variations in normal stress,gouge thickness,and ***,changes in sliding velocity and normal stress can lead to a shift between stable and unstable ***,stable sliding is favored by high sliding velocities and low normal stress applied in this ***,we analyze the experimental data by calculating the rate-and-state parameters using the rate-and state-dependent friction(RSF)***,the calculated friction rate parameter(a-b)supports the velocity-strengthening *** frictional relaxation(Dmc)during hold periods and frictional healing(Dm)upon re-shearing are linearly proportional to the logarithmic hold time,which may be attributed to the growth in true contact area with hold *** study sheds light on the roles of sliding velocity,and gouge thickness in controlling f

关键词： Rock friction Basalt fracture Gouge Velocity-strengthening behavior Frictional healing

Rational design and synergistic effect of ultrafine Ag nanodots decorated fish-scale-like Zn nanoleaves for highly selective electrochemical CO_(2)reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 8910-8918页

作者： Songyuan Yang Minghang Jiang Miao wang lei wang Xinmei Song Yaoda wang Zuoxiu Tie zhong Jin State Key Laboratory of Coordination Chemistry MOE Key Laboratory of Mesoscopic ChemistryMOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Chemistry School of ScienceXihua UniversityChengdu 610039China Suzhou Tierui New Energy Technology Co. Ltd.Suzhou 215228China Nanjing Tieming Energy Technology Co. Ltd.Nanjing 210093China

The electrocatalytic CO_(2)reduction reaction(CO_(2)RR)is regarded as a promising route for renewable energy conversion and storage,but its development is limited by the high overpotential and low stability and selectivity of ***,it is complicated to accurately adjust the nanostructure of electrocatalysts,which impacts ***,we propose the rational design and controlled preparation of ultrafine Ag nanodots decorated fish-scale-like Zn nanoleaves(Ag-NDs/Zn-NLs)for highly selective electrocatalytic CO_(2)*** Ag-NDs/Zn-NLs can be in-situ grown on copper foil with simple electrodeposition and replacement *** from the coordination and synergistic effect of Zn and Ag species,the reconstruction of Zn surface and the agglomeration of Ag-NDs are efficiently prevented,bringing high activity and durable electrocatalytic stability for CO_(2)-to-CO *** Faradaic efficiency for CO production reaches 85.2%at a moderate applied potential of-1.0 V *** hydrogen electrode(RHE).This study provides a promising approach for controlling the catalytic activity and selectivity of CO_(2)RR through the structural adjustment and decoration of transition metal based nanocatalysts.

关键词： electrochemical CO_(2)reduction electrodeposited nanoleaf structure silver nanodot transition metal heterostructure electrocatalytic selectivity and durability

Effect of electrical parameters and slag system on macrostructure of electroslag ingot

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Foundry 2024年第1期21卷 44-50页

作者： Bing-jie wang Yu wang Meng-jun wang lei Zhao Li-zhong Chang Xiao-fang Shi School of Metallurgy engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina

To investigate the influence of electric parameters and slag system on the solidification quality of electroslag ingot during electroslag remelting,different power supply modes,current strengths and remelting slag systems were used to conduct electroslag remelting experiments on 304L austenitic stainless steel,and the macrostructure of electroslag ingots was *** results indicate that the depth of the metal pool decreases with the reduction of remelting frequency in the low frequency power supply *** effects of different power supply modes,such as low-frequency,direct current straight polarity(DCSP),and direct current reverse polarity(DCRP),on reducing the depth of the metal pool increase in that *** reducing the remelting current strength in the same power supply mode,the depth of metal pool is *** compared to the binary slag system of 70%CaF2+30%Al2O3,the ternary slag system of 60%CaF2+20%Al2O3+20%CaO is more effective in reducing the depth of the metal pool during *** the 60%CaF2+20%Al2O3+20%CaO ternary slag system results in a shallower and flatter metal pool,with columnar crystal growth occurring closer to the axial *** effect is observed for both low frequency and direct current(DC)power supply modes.

关键词： electroslag remelting frequency slag system solidification quality

Enantioselective reductive conjugate alkenylation of α,β-enones with keto alkenyl acetates by nickel catalysis

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 157-162页

作者： Rong-De He Yun-lei Luo Qiu-Quan Pan Qi-Wei Yao Xing-zhong Shu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University

Reactions involving alkenyl acetates offer cost-effective and environmentally friendly routes for alkene synthesis, yet their asymmetric variant remains elusive. Concurrently, asymmetric conjugate alkenylation predominantly centered on nucleophilic addition using alkenyl–M. This manuscript presents an asymmetric reductive conjugate alkenylation reaction involving alkenyl acetates. The method facilitates the enantioselective addition of keto alkenyl groups to α,β-enones, resulting in the formation of unsaturated diketones—a class of useful structural motifs that are challenging to access otherwise. The use of electron-rich Pyroxy ligand is essential for achieving both high reaction efficiency and enantioselectivity.

关键词：

Enhanced Visible-light Photocatalytic Activity of g-C3N4/Nitrogen-doped Graphene Quantum Dots/TiO2 Ternary Heterojunctions for Ciprofloxacin Degradation with Narrow Band Gap and High Charge Carrier Mobility

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2020年第6期36卷 1083-1090页

作者： CHEN Ting zhong lei YANG Zhen MOU Zhigang LIU lei wang Yan SUN Jianhua lei Weiwei School of Chemistry and Environmental Engineering Institute of Advanced Functional Materials for EnergyJiangsu University of TechnologyChangzhou 213001P.R.China Institute for Frontier Materials Deakin UniversityWaurn PondsVictoria 3216Australia

Limited visible-light absorption and high recombination rate of photogenerated charges are two main drawbacks in g-C3Na-based *** solve these problems,g-CN4/nitrogen-doped graphene quantum dots(NGQDs)/TiO2 ternary heterojunctions were facilely prepared via a one-step calcining *** ***,optical and electrochemical properties of g-C3NA/NGQDs/TiO2 were characterized and *** optimal g-CN4/NGODs/TiOz composite exhibits enhanced photocatalytic degradation performance of ciprofloxacin(CIP)compared with the as-prepared ***:(P25)and g-C3N4/TiO2 heterojunction under visible light *** apparent rate constant of the composite is around 6.***.4.03 and 2.30 times higher than those of g-C3N4,TiOz and g-C3N4/TiO2,*** enhanced photocatalytic efficiency should be mainly attributed to the improvement of light absorption and charge separation and transfer efficiency,originating from the narrow band gap and high charge carrier *** active species trapping experiments results showed that the ht and'02 were the main active species in the degradation process.A possible photocatalytic reaction mechanism of the g-C3N4/NGODs/TiO2 composite for the enhanced degradation of CIP under visible light irradiation was also proposed.

关键词： g-C3N4/NGQDs/TiO2 Heterojunction Photocatalysis Antibiotic ciprofloxacin

Synergistically enhanced activity and stability of bifunctional nickel phosphide/sulfide heterointerface electrodes for direct alkaline seawater electrolysis

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 Energy Chemistry 2022年第12期75卷 66-73,I0003页

作者： Hao-Yu wang Jin-Tao Ren lei wang Ming-lei Sun Hui-Min Yang Xian-Wei Lv zhong-Yong Yuan School of Materials Science and Engineering Nankai UniversityTianjin 300350China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Direct electrolysis of seawater to generate hydrogen is an attractive but challenging renewable energy storage *** design of seawater electrolysis catalysts should integrate high activity for hydrogen evolution reaction(HER)/oxygen evolution reaction(OER)and enhanced physical/electrochemical stability in ***,we demonstrate the development of a Ni foam(NF)supported interfacial heterogeneous nickel phosphide/sulfide(Ni_(2)P/NiS_(2))microsphere electrocatalyst(NiPS/NF)through a facile electrodeposition and subsequent phosphorization/sulfuration *** NiS_(2)modification,a charge redistribution on the heterointerface is demonstrated and a more advantageous covalent nature of the Ni-P bond is obtained for more easily adsorption of H*and H_(2)*** NiPS/NF thus yields an impressive electrocatalytic performance in 1.0 M KOH,requiring small overpotentials of 169 and 320 mV for HER and OER to obtain a high current density of 100 m A cm^(-2),*** NiPS/NF can also work efficiently in alkaline seawater with negligible activity degradation,requiring overpotentials of only 188 and 344 mV for a current density of 100 m A cm^(-2)for HER and OER,respectively.A synergistically enhanced physical/electrochemical long-term stability NiPS/NF in saline water is also demonstrated.

关键词： Seawater electrolysis Hydrogen production Bifunctional electrocatalyst Heterostructure Anticorrosion