检索结果-南通市图书馆

Wide river or narrow river:Future river training strategy for Lower Yellow River under global change

International Journal of Sediment Research 2018年第3期33卷 271-284页

作者： Xiaonan Li Deyu Zhong Y.joseph zhang Yanjun Wang Yongqiang Wang Hongwu zhang State Key Laboratory of Hydroscience and Engineering Department of Hydraulic Engineering Tsinghua University Changjiang Institute of Survey Planning Design and Research Joint-Sponsored State Key Laboratory of Plateau Ecology and Agriculture QingHai University Center for Coastal Resource Management Virginia Institute of Marine Science Water Resources Department Changjiang River Scientific Research Institute

The choice of a river training strategy is extremely important for the Lower Yellow River(LYR). Currently,the wide-river training strategy applies in the training of the LYR. However, remarkable changes in the hydrological processes in the Yellow River basin, as well as immediate pressure from socio-economic development in the Yellow River basin, make it necessary to consider if there is a possibility to change the river training strategy from wide-river training to narrow-river training. This research investigates the impacts of different river training strategies on the LYR through numerical simulations. A onedimensional(1-D) model was used to simulate the fluvial processes for the future 50 years and a threedimensional(3-D) model was applied to study typical floods. The study focused on river morphology, the results show that if the present decreasing trend in both water discharge and sediment load persists, the deposition rate in the LYR will further decrease no matter what strategy is applied. Especially, narrowriver training can achieve the aim to increase the sediment transport capacity in the LYR compared with wide-river training. However, if the incoming water and sediment load recovers to the mean level of the last century, main channel shrinkage due to sedimentation inevitably occurs for both wide-river and narrow-river training. Most importantly, this study shows that narrow-river training reduces the deposition amount over the whole LYR, but it provides little help in alleviating the development of the"suspended river". Instead, narrow-river training can cause aggradation in the transitional reach where the river pattern changes from highly wandering to meandering, further worsening the "hump deposition" there. Because of uncertainty regarding future changes in hydrological processes in the Yellow River basin, and the lack of feasible engineering measures to mitigate "suspended river" and"hump deposition" problems in the LYR, caution should be exercised

关键词： Lower Yellow River River training Water-sediment interactions Numerical modeling Hump deposition

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

Numerical investigation of the control factors driving Zhe-Min Coastal Current

引用

Acta Oceanologica Sinica 2022年第2期41卷 127-138页

作者： Yang zhang Fei Chai joseph zhang Yang Ding Min Bao Yunwei Yan Hong Li Wei Yu Liang Chang State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China School of Marine Sciences University of MaineOronoME 04469USA Virginia Institute of Marine Science College of William&Mary Center for Coastal Resource ManagementWilliamsburgVA 23185USA Physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China Department of Atmospheric and Oceanic Sciences Institute of Atmospheric SciencesFudan UniversityShanghai 200438China College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China

During the northeast monsoon season,Zhe-Min Coastal Current(ZMCC)travels along the Chinese mainland coast and carries fresh,cold,and eutrophic *** is significantly important for the hydrodynamic processes and marine ecosystems along its ***,this bottom-trapped plume deserves to be further discussed in terms of the major driving factor,for which different opinions *** this purpose,in this study,a high resolution Semi-implicit Cross-scale Hydroscience Integrated System Model(SCHISM)is established and *** correlation coefficients exist between along-shelf wind speeds and seasonal variations of both ZMCC volume transport and the freshwater *** coefficients imply that the wind is important in regulating ***,for similar annual mean ZMCC volume transports,the extreme south boundaries of Zhe-Min Coastal Water(ZMCW)are different among different *** difference is attracting attention and is explored in this *** to the low wind/discharge experiment,it was found that although the volume transport of ZMCC is more sensitive to the variation of local wind speeds,the carried freshwater is limited by the Changjiang River discharge,which ultimately determines the south boundary of *** momentum analysis at transects I and II shows that,for driving ZMCC,the along-shore wind forcing is as important as the buoyancy *** that this conclusion is supported by a zero-discharge *** was also found that the buoyancy forcing varies with respect to time and space,which is due to variations of the discharge of Changjiang *** addition,a particle tracking experiment shows that the substance carried by the Changjiang River diluted water would distribute along the Zhe-Min coastal region during the northeast monsoon season and it may escape due to the wind relaxation.

关键词： coastal current numerical model momentum analysis Changjiang River diluted water East China Sea

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

Machine-Learning-Assisted Design of Deep Eutectic Solvents Based on Uncovered Hydrogen Bond Patterns

引用

Engineering 2024年第8期39卷 74-83页

作者： Usman L.Abbas Yuxuan zhang joseph Tapia Selim Md Jin Chen Jian Shi Qing Shao Department of Chemical and Materials Engineering University of KentuckyLexingtonKY 40506USA Department of Biosystems and Agricultural Engineering University of KentuckyLexingtonKY 40506USA Institute for Biomedical Informatics Department of Computer ScienceUniversity of KentuckyLexingtonKY 40506USA

Non-ionic deep eutectic solvents(DESs)are non-ionic designer solvents with various applications in catalysis,extraction,carbon capture,and ***,discovering new DES candidates is challenging due to a lack of efficient tools that accurately predict DES *** search for DES relies heavily on intuition or trial-and-error processes,leading to low success rates or missed *** that hydrogen bonds(HBs)play a central role in DES formation,we aim to identify HB features that distinguish DES from non-DES systems and use them to develop machine learning(ML)models to discover new DES *** first analyze the HB properties of 38 known DES and 111 known non-DES systems using their molecular dynamics(MD)simulation *** analysis reveals that DES systems have two unique features compared to non-DES systems:The DESs have①more imbalance between the numbers of the two intra-component HBs and②more and stronger inter-component *** on these results,we develop 30 ML models using ten algorithms and three types of HB-based *** model performance is first benchmarked using the average and minimal receiver operating characteristic(ROC)-area under the curve(AUC)*** also analyze the importance of individual features in the models,and the results are consistent with the simulation-based statistical ***,we validate the models using the experimental data of 34 *** extra trees forest model outperforms the other models in the validation,with an ROC-AUC of *** work illustrates the importance of HBs in DES formation and shows the potential of ML in discovering new DESs.

关键词： Machine learning Deep eutectic solvents Molecular dynamics simulations Hydrogen bond Molecular design

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

Ethanol steam reforming over Ni/ZSM-5 nanosheet for hydrogen production

引用

Chinese Journal of Chemical Engineering 2024年第3期67卷 247-256页

作者： Porapak Suriya Shanshan Xu Shengzhe Ding Sarayute Chansai Yilai Jiao joseph Hurd Daniel Lee Yuxin zhang Christopher Hardacre Prasert Reubroycharoen Xiaolei Fan Department of Chemical Engineering School of EngineeringThe University of ManchesterManchester M139PLUnited Kingdom Program of Petrochemistry and Polymer Science Faculty of ScienceChulalongkorn UniversityBangkok10330Thailand Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Liaoning Academy of Materials Shenyang 110167China Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals(CBRC) andDepartment of Chemical TechnologyFaculty of ScienceChulalongkorn UniversityBangkok 10330Thailand Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute University of Nottingham Ningbo ChinaNingbo315100China

Compared to reforming reactions using hydrocarbons,ethanol steam reforming(ESR)is a sustainable alternative for hydrogen(H_(2))production since ethanol can be produced sustainably using *** work explores the catalyst design strategies for preparing the Ni supported on ZSM-5 zeolite catalysts to promote ***,two-dimensional ZSM-5 nanosheet and conventional ZSM-5 crystal were used as the catalyst carriers and two synthesis strategies,i.e.,in situ encapsulation and wet impregnation method,were employed to prepare the *** on the comparative characterization of the catalysts and comparative catalytic assessments,it was found that the combination of the in situ encapsulation synthesis and the ZSM-5 nanosheet carrier was the effective strategy to develop catalysts for promoting H_(2) production via ESR due to the improved mass transfer(through the 2-D structure of ZSM-5 nanosheet)and formation of confined small Ni nanoparticles(resulted via the in situ encapsulation synthesis).In addition,the resulting ZSM-5 nanosheet supported Ni catalyst also showed high Ni dispersion and high accessibility to Ni sites by the reactants,being able to improve the activity and stability of catalysts and suppress metal sintering and coking during ESR at high reaction ***,the Ni supported on ZSM-5 nanosheet catalyst prepared by encapsulation showed the stable performance with~88% ethanol conversion and~65% H_(2) yield achieved during a 48-h longevity test at 550-C.

关键词： ZSM-5 nanosheet In situ encapsulation Ni catalyst Ethanol steam reforming Hydrogen production

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

High-yield and rapid isolation of extracellular vesicles by flocculation via orbital acoustic trapping:FLOAT

引用

Microsystems & Nanoengineering 2024年第1期10卷 313-323页

作者： joseph Rufo Peiran zhang Zeyu Wang Yuyang Gu Kaichun Yang joseph Rich Chuyi Chen Ruoyu Zhong Ke Jin Ye He Jianping Xia Ke Li Jiarong Wu Yingshi Ouyang Yoel Sadovsky Luke P.Lee Tony Jun Huang Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNCUSA Department of Biomedical Engineering Duke UniversityDurhamNCUSA Department of Obstetrics Gynecologyand Reproductive SciencesMagee-Womens Research InstituteUniversity of PittsburghPittsburghPAUSA Department of Microbiology and Molecular Genetics School of MedicineUniversity of PittsburghPittsburghPAUSA Renal Division and Division of Engineering in Medicine Department of MedicineBrigham and Women’s HospitalHarvard Medical SchoolBostonMAUSA Department of Bioengineering Department of Electrical Engineering and Computer ScienceUniversity of CaliforniaBerkeleyBerkeleyCAUSA Department of Biophysics Institute of Quantum BiophysicsSungkyunkwan UniversitySuwonKorea

Extracellular vesicles(EVs)have been identified as promising biomarkers for the noninvasive diagnosis of various ***,challenges in separating EVs from soluble proteins have resulted in variable EV recovery rates and low ***,we report a high-yield(>90%)and rapid(<10 min)EV isolation method called FLocculation via Orbital Acoustic Trapping(FLOAT).The FLOAT approach utilizes an acoustofluidic droplet centrifuge to rotate and controllably heat liquid *** adding a thermoresponsive polymer flocculant,nanoparticles as small as 20 nm can be rapidly and selectively concentrated at the center of the *** demonstrate the ability of FLOAT to separate urinary EVs from the highly abundant Tamm-Horsfall protein,addressing a significant obstacle in the development of EV-based liquid *** to its high-yield nature,FLOAT reduces biofluid starting volume requirements by a factor of 100(from 20 mL to 200µL),demonstrating its promising potential in point-of-care diagnostics.

关键词： trapping utilize separating

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

Solvent-Free Manufacturing of Lithium-Ion Battery Electrodes via Cold Plasma

引用

Energy & Environmental Materials 2024年第1期7卷 32-37页

作者： Zhiming Liang Tianyi Li Holden Chi joseph Ziegelbauer Kai Sun Ming Wang Wei zhang Tuo Liu Yang-Tse Cheng Zonghai Chen Xiaohong Gayden Chunmei Ban Paul M. Rady Department of Mechanical Engineering University of Colorado Boulder Advanced Photon Source Argonne National Laboratory Intecells Inc. Department of Materials Science and Engineering Michigan Center for Materials Characterization University of Michigan Department of Chemical and Materials Engineering University of Kentucky Department of Chemistry University of Kentucky Chemical Sciences and Engineering Division Argonne National Laboratory

Slurry casting has been used to fabricate lithium-ion battery electrodes for decades,which involves toxic and expensive organic solvents followed by high-cost vacuum drying and electrode *** work presents a new manufacturing method using a nonthermal plasma to create interparticle binding without using any polymeric binding materials,enabling solvent-free manufacturing electrodes with any electrochemistry of choice.

关键词： cold plasma deposition lithium-ion battery solvent-free manufacturing

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

Exciton-polaritons in a 2D hybrid organic-inorganic perovskite microcavity with the presence of optical Stark effect

引用

Chinese Physics B 2024年第3期33卷 551-555页

作者： Kenneth Coker 郑楚媛 joseph Roger Arhin Kwame Opuni-Boachie Obour Agyekum 张伟利 School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Department of Electrical and Electronic Engineering Ho Technical UniversityHo 00233Ghana Telecommunication Engineering Department Kwame Nkrumah University of Science and TechnologyKumasi 00233Ghana

This study investigates the properties of exciton-polaritons in a two-dimensional(2D)hybrid organic-inorganic perovskite microcavity in the presence of optical Stark *** both steady and dynamic state analyses,strong coupling between excitons of perovskite and cavity photons is revealed,indicating the formation of polaritons in the perovskite ***,it is found that an external optical Stark pulse can induce energy shifts of excitons proportional to the pulse intensity,which modifies the dispersion characteristics of the polaritons.

关键词： exciton-polaritons perovskite microcavity optical Stark effect

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

Constituents from leaves of Macaranga hemsleyana

引用

Chinese Herbal Medicines 2024年第3期16卷 481-486页

作者： joseph Sakah Kaunda Jia Liu Yaojun Xu Yuansi Chen Chenfang Yue Xingjie zhang Ruihan zhang Muhammad Amin Weilie Xiao Hongliang Li Xiaoli Li Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of EducationYunnan Characteristic Plant Extraction LaboratoryYunnan Provincial Center for Research&Development of Natural ProductsState Key Laboratory for Conservation and Utilization of Bio-Resources in YunnanSchool of PharmacySchool of MedicineChemical Science and TechnologyYunnan UniversityKunming 650500China Yunnan Key Laboratory of Pharmacology for Natural Products Haiyuan CollegeKunming Medical UniversityKunming 650500China

Objective:To study constituents of the leaves of Macaranga hemsleyana,and evaluate their inhibitory effects against NOD-like receptor thermal protein domain associated protein 3(NLRP3)inflammasome activation,and antiproliferative ***:The constituents were isolated and purified by column chromatography on MCI gel CHP20P/P120,silica gel,Sephadex LH-20,and *** structures of compounds were determined by 1D,2D NMR,and HR-ESI-MS *** inhibitory effect of compounds on inflammasome activation was determined by lactate dehydrogenase(LDH)*** antiproliferative activity was evaluated using MTT ***:The study led to the isolation of 23 compounds,including one new compound,identified as(2Z)-3-[4-(β-D-glucopyranosyloxy)-2′-hydroxy-5′-methoxyphenyl]-2-propenoic acid(1),together with 22 known compounds recognized as 1,4-dihydro-4-oxo-3-pyridinecarbonitrile(2),methyl 4-methoxynicotinate(3),4-methoxynicotinonitrile(4),1-(3-O-β-D-glucopyranosyl-4,5-dihydroxyphenyl)-ethanone(5),neoisoastilbin(6),isoastilbin(7),aromadendrin(8),neoastilbin(9),astilbin(10),quercitrin(11),neoschaftoside(12),apigenin 6,8-bis-C-α-L-arabinoside(13),vitexin(14),bergenin(15),scopoletin(16),glucopyranoside salicyl(17),koaburside(18),benzylβ-D-glucoside(19),icariside B5(20),roseoside(21),loliolide(22),and adenosine(23).The tested compounds did not show LDH inhibition nor antiproliferative ***:Compound 1 was a new *** 2 and 3 were obtained for the first time from natural *** 22 known compounds constituted of alkaloids(2–4,23),phenolics(5,15,17,18),flavonoids(6–14),coumarin(16),benzyl glycoside(19),and norsesquiterpenes(20–22).All the compounds,1–23,were revealed from *** for the first *** is the initial uncovering of molecules 1–10,12,13,17–19,and 23 from the genus *** isolated compounds,11,14–16,and 20–22 established taxonomic classification of *** in Euphorbiaceae *** were outstanding as

关键词： antiproliferative activity chemotaxonomic significance flavonoids glycoside Macaranga hemsleyana Pax et Hoffm NLRP3 inflammasome

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 Crystal and Molecular Structure of a New Macrocyclic Ligand, (H_6BDBPH)Br_6·4H_2O

引用

Chinese Journal of Structural Chemistry 2000年第5期19卷 334-337页

作者： SHANGGUAN Guo\|Qiang (Department of Chemistry, Jining Medical College, Jining 272013) [WT4”BZ]Arthur E. Martell Zhongren zhang joseph Reibenspies (Department of Chemistry, Texas A&M University, College Station, Texas 77842, USA) Department of Chemistry Jining Medical College Jining 272013 China Department of Chemistry Texas A and M University College Station TX 77842 United States

The hexahydro\|bromide salt of a new 24\|membered hexaaza diphenol macrocyclic ligand, （H6BDBPH）Br6·4H2O （C 26H 56N6O6Br6, Mr= 1028.23）, crystallizes in the monoclinic system, space group P21/c, with cell parameters: a=14.441（5）, b=11.482（4）, c=12.090（6）, β=96.92°, V= 1990 （1）3, Z=2, Dc=1.716 g/cm3; F（000） =1024. MoKα radiation, λ= 0.71013), R = 0.0643 and wR = 0.1356 for 3507 independent reflections with I>2σ（I）. The macrocyclic ligand adapts chair form, and the crystallographic inversion center is located in the macrocyclic cavity, and the six bromide ions and four water molecules are situated symmetrically outside the macrocyclic cavity.

关键词： macrocyclic ligand synthesis crystal structure

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

An X-Ray Burst Associated with FRB 200428 from a Magnetar-asteroid Impact

引用

Research in Astronomy and Astrophysics 2023年第8期23卷 238-246页

作者： Ze-Nan Liu Yuan-Pei Yang Wei-Yang Wang Zhao joseph zhang Qiao-Chu Li Ken Chen Jia Ren Bin-Bin zhang Cheng-Kui Li Shuang-Nan zhang Zi-Gao Dai School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University) Ministry of EducationNanjing 210023China South-Western Institute for Astronomy Research Yunnan UniversityKunming 650500China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of Astronomy School of Physical SciencesUniversity of Science and Technology of ChinaHefei 230026China

Fast radio bursts(FRBs)are extragalactic radio transients with millisecond duration and brightness *** FRB-associated X-ray burst(XRB)was recently found to arise from the Galactic magnetar SGR J1935+*** the model of Dai,in which an FRB may originate from a magnetar encountering an asteroid,we focus on explaining the spectrum of the XRB associated with FRB 200428 from SGR J1935+*** between asteroidal fragments and the magnetar surface produce a fireball,which further expands *** to the velocity difference among some shells in the fireball,internal shocks would form far away from the magnetar,and further emit X-ray *** propose that the FRB-associated XRB can be produced by synchrotron emission from the internal shocks,and then constrain the physical parameters by the observed XRB spectrum.

关键词： stars magnetars-minor planets-asteroids general-radiation mechanisms general

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：