检索结果-南通市图书馆

Kinetic-Thermodynamic Promotion Engineering toward High-Density Hierarchical and Zn-Doping Activity-Enhancing ZnNiO@CF for High-Capacity Desalination

引用

Nano-Micro Letters 2024年第8期16卷 35-50页

作者： Jie Ma Siyang Xing Yabo Wang jinhu yang Fei Yu College of Marine Ecology and Environment Shanghai Ocean University201306 ShanghaiPeople’s Republic of China School of Civil Engineering Kashi University844000 KashiPeople’s Republic of China Research Center for Environmental Functional Materials College of Environmental Science and EngineeringTongji University1239 Siping Road200092 ShanghaiPeople’s Republic of China School of Chemical Science and Engineering Tongji University1239 Siping Road200092 ShanghaiPeople’s Republic of China Department of Energy Environmental&Chemical EngineeringWashington University in St.LouisSt.LouisMO 63130USA

Despite the promising potential of transition metal oxides(TMOs)as capacitive deionization(CDI)electrodes,the actual capacity of TMOs electrodes for sodium storage is significantly lower than the theoretical capacity,posing a major ***,we prepared the kinetically favorable Zn_(x)Ni_(1−x)O electrode in situ growth on carbon felt(Zn_(x)Ni_(1−x)O@CF)through constraining the rate of OH^(−)generation in the hydrothermal ***_(x)Ni_(1−x)O@CF exhibited a high-density hierarchical nanosheet structure with three-dimensional open pores,benefitting the ion transport/electron *** tuning the moderate amount of redox-inert Zn-doping can enhance surface electroactive sites,actual activity of redox-active Ni species,and lower adsorption energy,promoting the adsorption kinetic and thermodynamic of the Zn_(0.2)Ni_(0.8)O@*** from the kinetic-thermodynamic facilitation mechanism,Zn_(0.2)Ni_(0.8)O@CF achieved ultrahigh desalination capacity(128.9 mgNaCl g^(-1)),ultra-low energy consumption(0.164 kW h kgNaCl^(-1)),high salt removal rate(1.21 mgNaCl g^(-1) min^(-1)),and good *** thermodynamic facilitation and Na^(+)intercalation mechanism of Zn_(0.2)Ni_(0.8)O@CF are identified by the density functional theory calculations and electrochemical quartz crystal microbalance with dissipation monitoring,*** research provides new insights into controlling electrochemically favorable morphology and demonstrates that Zn-doping,which is redox-inert,is essential for enhancing the electrochemical performance of CDI electrodes.

关键词： Zinc-nickel metal oxide High-density hierarchical Capacitive deionization Zinc-doping

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

MIL-100(V) derived porous vanadium oxide/carbon microspheres with oxygen defects and intercalated water molecules as high-performance cathode for aqueous zinc ion battery

引用

Journal of Energy Chemistry 2024年第3期90卷 578-589,I0013页

作者： Yuexin Liu Jian Huang Xiaoyu Li Jiajia Li jinhu yang Kefeng Cai Shanghai Key Laboratory of Development and Application for Metal-Functional Materials Key Laboratory of Advanced Civil Engineering MaterialsMinistry of EducationSchool of Materials Science&EngineeringTongji UniversityShanghai 201804China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201800China Research Center for Translational Medicine East HospitalTongji University School of MedicineShanghai 200092China

The development of aqueous zinc ion battery cathode materials with high capacity and high magnification is still a ***,porous vanadium oxide/carbon(p-VO_(x)@C,mainly VO_(2) with a small amount of V_(2)O_(3)) core/shell microspheres with oxygen vacancies are facilely fabricated by using a vanadium-based metal-organic framework(MIL-100(V)) as a sacrificial *** unique structure can improve the conductivity of the VO_(x),accelerate electrolyte diffusion,and suppress structural collapse during ***,H_(2)O molecules are introduced into the interlayer of VO_(x) through a highly efficient in-situ electrochemical activation process,facilitating the intercalation and diffusion of zinc *** the activation,an optimal sample exhibits a high specific capacity of 464.3 mA h g^(-1) at0.2 A g^(-1) and 395.2 mA h g^(-1) at 10 A g^(-1),indicating excellent rate ***,the optimal sample maintains a capacity retention of about 89.3% after 2500 cycles at 10 A g^(-1).Density functional theory calculation demonstrates that the presence of oxygen vacancies and intercalated water molecules can significantly reduce the diffusion barrier for zinc *** addition,it is proved that the storage of zinc ions in the cathode is achieved by reversible intercalation/extraction during the charge and discharge process through various ex-situ analysis *** work demonstrates that the p-VO_(x)@C has great potential for applications in aqueous ZIBs after electrochemical activation.

关键词： Metal-organic frameworks Vanadium oxide Carbon Zn-ion batteries Electrochemical activation

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

冻融受荷砂岩力学性能劣化与统计损伤模型研究

引用

煤炭科学技术 2024年第5期52卷 84-91页

作者：张二锋刘慧康跃明杨金虎中煤科工集团重庆研究院有限公司重庆400039 西安科技大学建筑与土木工程学院陕西西安710054

在西部地区矿产资源开发和工程建设中,砂岩作为主要的工程地质含水层之一,冻融环境影响砂岩的力学及变形特性。为研究受冻融环境影响下受荷岩力学性能的劣化和损伤特性,以陕西地区红色细砂岩为研究对象,开展0、5、10、20和30次冻融循环... 详细信息

在西部地区矿产资源开发和工程建设中,砂岩作为主要的工程地质含水层之一,冻融环境影响砂岩的力学及变形特性。为研究受冻融环境影响下受荷岩力学性能的劣化和损伤特性,以陕西地区红色细砂岩为研究对象,开展0、5、10、20和30次冻融循环试验和单轴压缩试验,获得冻融后砂岩的单轴压缩全过程应力–应变曲线和力学特征参数,对冻融岩石进行力学特征参数分析,建立冻融环境下岩石力学性能的劣化模型;基于冻融环境对岩石损伤的影响,考虑岩石在变形阶段中压密阶段的特点,建立考虑压密阶段修正统计损伤本构模型。结果表明:随着冻融循环次数的增加,岩石压密阶段的占比越来越大,峰值应也变逐渐增大,冻融循环前30次岩石发生脆性破坏,冻融循环30次后岩石脆性明显减弱,应变软化阶段明显;冻融循环前10次,力学特征参数损失率增长较快,之后明显减缓;冻融循环30次之后,峰值强度损失率为47.27%,弹性模量损失率为60.35%;其中力学特征参数损失率与冻融循环次数成一次线性增长,在建立的力学性能劣化模型中,冻融后岩石力学性能占比成指数递减,利用冻融环境下岩石的孔隙特征,可准确预测岩石在冻融环境作用下的峰值强度和弹性模量;考虑压密阶段的修正统计损伤本构模型与试验曲线拟合度更高,修正理论模型可对冻融受荷岩石力学性能劣化和损伤预测提供借鉴。

关键词：冻融受荷岩石力学统计损伤本构模型

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

氧化钙-碳酸钠复合激发矿渣砂浆的自收缩机制

引用

哈尔滨工业大学学报 2024年第2期56卷 86-94页

作者：杨锦湖林添琦张检梅陈徐东季韬福州大学土木工程学院福州350108 河海大学土木与交通学院南京210098

为探究氧化钙和碳酸钠复合激发矿渣对碱激发水泥自收缩的影响机制,采用氧化钙和碳酸钠(摩尔比1∶1)为复合激发剂制备碱矿渣砂浆(AM),研究复合激发剂Na_(2)O质量分数(CaO和Na_(2)CO_(3)反应生成的Na_(2)O质量与矿渣质量比,为2.5%、4.5%、... 详细信息

为探究氧化钙和碳酸钠复合激发矿渣对碱激发水泥自收缩的影响机制,采用氧化钙和碳酸钠(摩尔比1∶1)为复合激发剂制备碱矿渣砂浆(AM),研究复合激发剂Na_(2)O质量分数(CaO和Na_(2)CO_(3)反应生成的Na_(2)O质量与矿渣质量比,为2.5%、4.5%、6.5%和8.5%)对AM自收缩的影响;通过XRD、TG-DTG、MIP和NMR分析其水化产物与微观结构。结果表明:随着Na_(2)O质量分数的增加,激发剂反应耗水量增加,孔结构细化,孔隙压力增大;Al^(3+)对C-(A)-S-H中Si^(4+)的取代量增多导致Na^(+)的吸附量增多,C-(A)-S-H滑移增大;水化程度提高,水化产物数量增多,AM的自收缩增大。Na_(2)O质量分数为6.5%的AM为最优组,其力学性能高于普通硅酸盐水泥砂浆(OM),但由于较低的晶体含量和致密的孔结构,其自收缩大于OM。

关键词：碱矿渣砂浆氧化钙碳酸钠自收缩

来源：

维普期刊数据库博看期刊

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

2022年长江流域重大干旱发展过程中西太平洋副热带高压的多维度异常特征

引用

科学通报 2024年第15期69卷 2081-2092页

作者：段欣妤张强张良马鹏里方锋杨金虎朱飙中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室中国气象局干旱气候变化与减灾重点开放实验室兰州730020 甘肃省气象局兰州730020 兰州区域气候中心兰州730020

2022年长江流域发生了罕见的夏秋冬连旱.此次干旱是伏秋季降水异常偏少和气温异常偏高叠加形成的复合型干旱,与冬季干旱连在一起的超长事件;其中8月全流域的高温干旱异常特征最为显著.以往关于西太平洋副热带高压(简称西太副高)的异常... 详细信息

2022年长江流域发生了罕见的夏秋冬连旱.此次干旱是伏秋季降水异常偏少和气温异常偏高叠加形成的复合型干旱,与冬季干旱连在一起的超长事件;其中8月全流域的高温干旱异常特征最为显著.以往关于西太平洋副热带高压(简称西太副高)的异常变化对长江流域高温热浪和干旱的影响的相关研究主要侧重于纬向异常这种单一维度的异常,而较少关注其经向、厚度、面积、持续时间的多个维度异常;且单一维度的异常不足以刻画其作为主控环流因子对极端高温干旱事件的影响.为了揭示西太副高的多维度异常特征对此次长江流域重大干旱的影响,本文重点分析了干旱发展过程中西太副高的多个维度异常特征.结果表明,在整个干旱发展过程中,8月西太副高在500 hPa上纬向偏西异常最为显著,无明显的经向异常.覆盖长江流域的面积为历年同期最大.在垂直方向上自低层往高层不断西伸;400~200 h Pa上西太副高与南亚高压位置相互联通,以高压坝的形式覆盖长江流域,西太副高的厚度异常深厚.通过与历史同期8月不同程度干旱年份进行对比分析,结果发现,只有当西太副高的空间异常持续维持,才能造成流域严重的高温干旱.

关键词： 2022年长江流域重大干旱西太平洋副热带高压多维度异常特征

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

Characteristics of Extreme Temperature Event and Its Response to Regional Warming in Northwest China in Past 45 Years

引用

Chinese Geographical Science 2008年第1期18卷 70-76页

作者： yang jinhu REN Chuanyou JIANG Zhihong Lanzhou institute of Arid Meteorology of China Meteorological Administration Lanzhou 730020 China Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province Lanzhou 730020 China Key Laboratory of Arid Climate Change and Disaster Reduction of China Meteorological Administration Lanzhou 730020 China Department of Atmospheric Science Nanjing University of information Science and Technology Nanjing 210044 China Department of Applied Meteorology Shenyang Agricultural University Shenyang 110161 China

Using the daily maximum and minimum temperature dataset from 128 stations from 1960 to 2004 in Northwest China,daily extreme high temperature(EHT)and extreme low temperature(ELT)thresholds were deter-mined by centesimal method for different stations at first,then yearly EHT and ELT events were counted up in differ-ent stations,and the characteristics of their spatio-temporal distribution were diagnosed at *** study drew follow-ing conclusions:1)The consistent anomaly distribution characteristic was the most important mode of the EHT and ELT events in Northwest China.2)The spatial distribution of the EHT and ELT events can be divided into five sub-regions,namely,the north of Qinghai and west of Gansu,the north of Xinjiang,the south of Xinjiang,the east of Northwest China and the south of Qinghai.3)The EHT events showed remarkable increasing trend in all of five sub-regions,but only in the north of Qinghai and west of Gansu area,sudden change phenomenon occurred;the ELT events showed decreasing trend in all of five sub-regions,and sudden change phenomenon occurred in Northwest China except for south of Qinghai.4)In all of five sub-regions the EHT events showed remarkable 12-14yr period os-cillation,and the ELT event showed significant 13-15yr and 7-8yr period oscillation.5)The EHT and ELT events displayed remarkable positive and negative responses to regional warming of Northwest China respectively.

关键词： extreme temperature response to warming Northwest China

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

基于GNSS技术对滑坡体稳定性试验研究

引用

山西建筑 2024年第3期50卷 86-89页

作者：赵智辉杨金虎中煤科工集团重庆研究院有限公司重庆400050

以一煤矿上方滑坡自动化监测工程为背景,提出北斗/GNSS技术对滑坡稳定性现场试验的可行性研究方案。通过现场GNSS监测数据对滑坡体的稳定性进行研究,详细分析了整个滑坡体的变化规律后,证明目前地表处于基本稳定状态,同时发现通过GNSS... 详细信息

以一煤矿上方滑坡自动化监测工程为背景,提出北斗/GNSS技术对滑坡稳定性现场试验的可行性研究方案。通过现场GNSS监测数据对滑坡体的稳定性进行研究,详细分析了整个滑坡体的变化规律后,证明目前地表处于基本稳定状态,同时发现通过GNSS技术可以用来监测滑坡体顶部稳定性。

关键词： GNSS 滑坡现场实验监测设备预警模型

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

Experimental and Numerical Investigations on Ignition and LBO Performances for Staged Combustor under Sub-Atmospheric Conditions

引用

Journal of Thermal Science 2023年第3期32卷 1251-1262页

作者： ZHAO Qianpeng XU Gang MU Yong yang jinhu WANG Kaixing Laboratory of Light-Duty Gas-Turbine Institute of Engineering ThermophysicsChinese Academy of Sciences University of Chinese Academy of Sciences Innovation Academy for Light-duty Gas Turbine

In order to effectively widen the high-altitude operating limits of the multi-swirl staged combustor,the ignition and lean blow-out(LBO)performances of the model combustor were experimentally acquired under the conditions of room temperature and sub-atmospheric pressure with the altitude ranging from 0 km to 12 ***,the isothermal flow fields inside a staged model combustor with different sub-atmospheric conditions were *** results show that the minimum ignition and LBO fuel-air ratio(FAR)increase rapidly with the increase of simulated *** addition,as the relative pressure drop of injector increases from1%to 3%,the ignition and LBO performances are gradually *** visualization of the flame by high-speed camera shows that the time-averaged flames under stable combustion have a similar distribution pattern under different pressure *** luminous intensity is stratified into dim-bright-dim layers along axial *** flame near LBO shrinks to the outlet of pilot stage with a great reduction in luminous *** numerical results reveal that with the decrease of air pressure,the air mass flow rate involved in atomization and combustion is significantly reduced,and the aerodynamic shear force of swirling air is weakened,which are adverse to atomization and fuel-air mixing for airblast atomizer and further lead to the deterioration of ignition and LBO performances.

关键词： ignition lean blow-out sub-atmospheric pressure staged combustor airblast atomizer

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

Investigation of the Effect of Pilot Burner on Lean Blow Out Performance of A Staged Injector

引用

Journal of Thermal Science 2014年第6期23卷 600-608页

作者： yang jinhu ZHANG Kaiyu LIU Cunxi RUAN Changlong LIU Fuqiang XU Gang Key Laboratory of Light-duty Gas-turbine Institute of Engineering ThermophysicsChinese Academy of Sciences

The staged injector has exhibited great potential to achieve low emissions and is becoming the preferable choice of many civil airplanes. Moreover, it is promising to employ this injector design in military engine, which requires most of the combustion air enters the combustor through injector to reduce smoke emission. However, lean staged injector is prone to combustion instability and extinction in low load operation, so techniques for broadening its stable operation ranges are crucial for its application in real *** this work, the LBO performance of a staged injector is assessed and analyzed on a single sector test *** experiment was done in atmospheric environment with optical access. Kerosene-PLIF technique was used to visualize the spray distribution and common camera was used to record the flame patterns. Emphasis is put on the influence of pilot burner on LBO performance. The fuel to air ratios at LBO of six injectors with different pilot swirler vane angle were evaluated and the obtained LBO data was converted into data at idle condition. Results show that the increase of pilot swirler vane angle could promote the air assisted atomization, which in turn improves the LBO performance slightly. Flame patterns typical in the process of LBO are analyzed and attempts are made to find out the main factors which govern the extinction process with the assistance of spray distribution and numerical flow field results. It can be learned that the flame patterns are mainly influenced by structure of the flow field just behind the pilot burner when the fuel mass flow rate is high; with the reduction of fuel, atomization quality become more and more important and is the main contributing factor of LBO. In the end of the paper,conclusions are drawn and suggestions are made for the optimization of the present staged injector.

关键词： Staged injector LBO Spray distribution Flame pattern

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

A New Methodology for Early Detection of Thermoacoustic Combustion Oscillations Based on Permutation Entropy

引用

Journal of Thermal Science 2023年第6期32卷 2310-2320页

作者： LI Yao HU Chunyan SHEN Youhao HAN Bo yang jinhu XU Gang Key Laboratory of Light Duty Gas Turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Innovation Academy for Light-Duty Gas Turbine Chinese Academy of SciencesBeijing100190China

We carry out a series of experimental investigations in a model combustor to detect a precursor of thermoacoustic combustion oscillations based on permutation entropy,which can amplify the subtle changes effected in the time sequence to identify the *** changing the flame’s location or the fuel flow to a value,an abrupt switch from aperiodic small-amplitude oscillations to periodic large-amplitude oscillations would occur in pressure *** characteristic frequency of combustion oscillation is obtained by spectral analysis,with which a modified algorithm of the permutation entropy is *** impact evaluation on key parameters such as moving step sizes and window sizes reveals that the moving data permutation entropy has strong robustness,and can accurately detect the onset of thermoacoustic *** nonlinear analysis exhibits peculiar dynamics of the combustion system,which result in specific patterns in the time series and provide a theoretical basis for anomaly *** results suggest that the permutation entropy has a certain potential in early warning and detection of combustion oscillations.

关键词： thermoacoustic combustion oscillation permutation entropy moving data anomaly detection precursors

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：