检索结果-南通市图书馆

Frontiers of Environmental Science & Engineering 2022年第4期16卷 157-160页

作者： zhida li Lu Lu State Key Laboratory of Urban Water Resource and Environment School of Civil and Environmental EngineeringHarbin Institute of TechnologyShenzhen 518055China

Current wastewater treatment(WWT)is energy-intensive and leads to vast CO_(2) *** pledge of“double carbon”target encourages a paradigm shift from fossil fiiels use to renewable energy harvesting during *** this context,hybrid microbial photoelectrochemical(MPEC)system integrating microbial electrochemical WWT with artificial photosynthesis(APS)emerges as a promising approach to tackle water-energy-carbon challenges ***,we emphasized the significance to implement energy recovery during WWT for achieving the carbon neutrality ***,we elucidated the working principle of MPEC and its advantages compared with conventional APS,and discussed its potential in fulfilling energy self-sustaining WWT,carbon capture and solar fuel ***,we provided a strategy to judge the carbon profit by analysis of energy and carbon fluxes in a MPEC using several common organics in ***,MPEC provides an alternative of WWT approach to assist carbon-neutral goal,and simultaneously achieves solar harvesting,conversion and storage.

关键词： Wastewater treatment Artificial photosynthesis Microbial photoelectrochemical(MPEC)system Carbon neutral Renewable energy

Strain Amplitude Effect on the Viscoelastic Mechanics of Chloroprene Rubber

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2020年第3期33卷 392-402页

作者： Longfan Peng zhida li Yunyu li Institute of Transportation Wuhan University of TechnologyWuhan 430063HubeiChina

This paper establishes an empirical formula to predict the strain amplitude effect.A viscoelastic constitutive model-the superposition of a hyperelastic model and a viscoelastic model-is constructed based on the laws of *** Mooney Rivlin model and the Prony series are employed for uniaxial tension *** empirical formula is derived using a hysteresis loop;it obtains results that are in agreement with the experimental results of dynamic mechanical analysis(DMA).The empirical formula proposed in this paper has certain accuracy in predicting the dynamic modulus under different strain amplitudes.

关键词： Viscoelasticity Strain amplitude effect Storage modulus Loss modulus Hysteresis loop

Effects of Electrode on Resistance Switching Properties of ZnMn_2O_4 Films Deposited by Magnetron Sputtering

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 Wuhan University of Technology(Materials Science) 2016年第6期31卷 1230-1234页

作者：王华 li zhida xu jiwen zhang yupei yang ling School of Materials Science and Engineering Guilin University of Electronic Technology Guilin 541004 China

ZnMn_2O_4 films for resistance random access memory（RRAM） were fabricated with different device structures by magnetron sputtering. The effects of electrode on I-V characteristics, resistance switching behavior, endurance and retention characteristics of ZnMn_2O_4 films were investigated. The ZnMn_2O_4 films, using p-Si and Pt as bottom electrode, exhibit bipolar resistive switching（BRS） behavior dominated by the space-charge-limited conduction（SCLC） mechanism in the high resistance state（HRS） and the filament conduction mechanism in the low resistance state（LRS）, but the ZnMn_2O_4 films using n-Si as bottom electrodes exhibit both bipolar and unipolar resistive switching behaviors controlled by the Poole-Frenkel（P-F） conduction mechanism in both HRS and LRS. Ag/ZnMn_2O_4/p-Si device possesses the best endurance and retention characteristics, in which the number of stable repetition switching cycle is over 1000 and the retention time is longer than 106 seconds. However, the highest RHRS/R_（LRS） ratio of 104 and the lowest V_（ON） and V_（OFF） of 3.0 V have been observed in Ag/ZnMn_2O_4/Pt device. Though the Ag/ZnMn_2O_4/n-Si device also possesses the highest RHRS/R_（LRS） ratio of 104, but the highest values of V_（ON）,V_（OFF）, RHRS and R_（LRS）, as well as the poor endurance and retention characteristics.

关键词： ZnMn2O4 resistance switching behavior electrode magnetron sputtering

Resistance Switching Properties of Ag/Zn Mn_2O_4/p-Si Fabricated by Magnetron Sputtering for Resistance Random Access Memory

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2015年第6期30卷 1159-1162页

作者：王华 li zhida XU Jiwen ZHANG Yupei YANG ling QIU Wei School of Materials Science and Engineering Guilin University of Electronic Technology

A resistance random access memory（RRAM） with a structure of Ag/ZnMn2O4/p-Si was fabricated by magnetron sputtering method. Reliable and repeated switching of the resistance of ZnMn2O4 fi lms was obtained between two well-defi ned states of high and low resistance with a narrow dispersion and 3V switching voltages. Resistance ratio of the high resistance state and low resistance state was found in the range of around 10^3 orders of magnitude and up to about 10^3 test cycles. The retention time of Ag/ZnMn2O4/p-Si device is longer than 10^6 seconds and the resistance ratio between two states remains higher than 10^3 at room temperature, showing a remarkable reliability performance of the RRAM devices for nonvolatile memory application. The equivalent simulation circuits for HRS（high resistance state） and LRS（low resistance state） were also studied by impedance spectroscopy.

关键词： ZnMn2O4 resistance switching properties RRAM magnetron sputtering

Coexistence of Bipolar and Unipolar Resistive Switching Behavior in Ag/ZnMn_2O_4/p^+-Si Device

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2018年第6期33卷 1433-1436页

作者： ZHANG Yupei WANG Hua School of Materials Science and Engineering Guilin University of Electronic Technology

ZnMn_2O_4 thin films were deposited by a sol-gel technique onto a p+-Si substrate, and a RRAM device with the Ag/ZnMn_2O_4/p^+-Si structure was fabricated. The microstructure of ZnMn_2O_4 films and the resistive switching behavior of Ag/ZnMn_2O_4/p^+-Si device were investigated. ZnMn_2O_4 thin films had a spinel structure after annealing at 650 °C for 1 h. The Ag/ZnMn_2O_4/p^+-Si device showed unipolar and/or bipolar resistive switching behavior, exhibiting different ION/IOFF ratio and switching endurance properties. In bipolar resistive switching, high-resistance-state(HRS) conduction was dominated by the space-charge-limited conduction mechanism, whereas the filament conduction mechanism dictated the low resistance state(LRS). For unipolar resistive switching, HRS and LRS were controlled by the filament conduction mechanism. For bipolar resistive switching, the conduction process can be explained by the space-charge region of the p-n junction.

关键词： ZnMn2O4 resistive switching behavior bipolar unipolar

基于初始孔压非均布条件的软黏土地基固结特性分析

在线全文

学校读者我要写书评

暂无评论

重庆交通大学学报（自然科学版） 2017年第10期36卷 45-50页

作者：李之达邵玉武汉理工大学交通学院湖北武汉430063

将初始孔压非均布条件用统一表达式表示,采用Merchant模型推导了初始孔压非均布条件下的竖井地基黏弹性解。通过与初始孔压均匀分布条件下的黏弹性解对比,验证了本文解的正确性。并编制计算程序分别分析黏弹性参数、初始孔压参数对于竖... 详细信息

将初始孔压非均布条件用统一表达式表示,采用Merchant模型推导了初始孔压非均布条件下的竖井地基黏弹性解。通过与初始孔压均匀分布条件下的黏弹性解对比,验证了本文解的正确性。并编制计算程序分别分析黏弹性参数、初始孔压参数对于竖井地基固结特性的影响。研究表明:k及η值的增大均使固结速率降低,使同等深度的平均孔压增大,且对竖井地基平均孔压的影响较其对平均固结度的影响明显;同样条件下,k值的变化对竖井地基固结特性的影响更大。

关键词：岩土工程非均布初始孔压黏弹性固结特性

在线全文

学校读者我要写书评

暂无评论

隧道施工数值模拟与监控

武汉理工大学学报（交通科学与工程版） 2010年第3期34卷 620-624页

作者：李之达黄强武汉理工大学交通学院武汉430063 洛阳理工学院土木工程系洛阳471003

以某公路隧道施工为背景,对隧道台阶法开挖方式进行了施工数值模拟和现场监测监控,分析开挖过程中的围岩应力的变化情况,并将模拟结果与现场监测结果进行比较.结果表明:钢弦式传感器可用于围岩应力监测;开挖下台阶时,围岩的应力变化剧烈... 详细信息

以某公路隧道施工为背景,对隧道台阶法开挖方式进行了施工数值模拟和现场监测监控,分析开挖过程中的围岩应力的变化情况,并将模拟结果与现场监测结果进行比较.结果表明:钢弦式传感器可用于围岩应力监测;开挖下台阶时,围岩的应力变化剧烈,下台阶远离监测断面后,监测点的应力变化趋于平稳;通过对监测数据的拟合,在开挖145 d后围岩已经趋于稳定,可以施作二次衬砌.

关键词：隧道施工台阶法围岩应力数值模拟现场监测

在线全文

学校读者我要写书评

暂无评论

长沙市某深基坑工程的监测及变形规律研究

建筑结构 2020年第2期50卷 133-137页

作者：龙林李之达武汉理工大学交通学院武汉430063

以长沙市某深基坑工程为实例,在基坑周围区域共布设39个监测点,分别实时监测了坑顶水平位移、周围建筑物沉降、深层侧向位移、地下水位和锚索内力。根据监测结果对各监测项目的变形规律进行了讨论;分析了桩锚支护与土钉支护两种支护结... 详细信息

以长沙市某深基坑工程为实例,在基坑周围区域共布设39个监测点,分别实时监测了坑顶水平位移、周围建筑物沉降、深层侧向位移、地下水位和锚索内力。根据监测结果对各监测项目的变形规律进行了讨论;分析了桩锚支护与土钉支护两种支护结构的变形特点。监测数据和分析结果表明,该工程支护设计方案较优且支护效果较好。监测分析结果较好地确保了在深基坑开挖过程中周围建筑和道路的安全与稳定,对基坑支护设计和开挖施工能及时做出信息反馈,同时表明桩锚支护和土钉支护两种基坑支护形式在长沙地区的适用性,对长沙区域类似深基坑工程具有参考价值。

关键词：深基坑监测基坑支护变形规律

考虑管冷的大体积混凝土水化热初期温度场研究

在线全文

学校读者我要写书评

暂无评论

重庆交通大学学报（自然科学版） 2018年第6期37卷 1-7页

作者：李之达孙绪涛武汉理工大学交通学院湖北武汉430063

结合武汉府河大桥22#承台施工,根据水管冷却等效热传导方程,利用有限元软件Midas/Civil建立了承台三维实体有限元模型,对承台浇筑后的温度场进行模拟,并对混凝土温度进行实际监测,对比分析有限元计算结果和温度监测结果,二者吻合良好,... 详细信息

结合武汉府河大桥22#承台施工,根据水管冷却等效热传导方程,利用有限元软件Midas/Civil建立了承台三维实体有限元模型,对承台浇筑后的温度场进行模拟,并对混凝土温度进行实际监测,对比分析有限元计算结果和温度监测结果,二者吻合良好,所建立的有限元模型可以较好的模拟大体积混凝土早期水化热温度场变化特征;对承台表面加强保温后,根据有限元计算结果,表面拉应力分布得到改善,可有效降低承台开裂风险;利用有限元模型分析冷管入水温度的影响,证明降低冷管入水温度虽然可有效降低混凝土内部最高温度,并可在较短时间内使承台达到最高温度进而开始降温,但也存在不利影响,实际工程中冷管入水温度最好可以根据承台内部最高温度做出相应调节。

关键词：桥梁工程大体积混凝土管冷水化热温度场

在线全文

学校读者我要写书评

暂无评论

高效弯掠对转桨扇流动特点与桨距调节规律

航空动力学报 2022年第8期37卷 1703-1713页

作者：李治达陈翔翔吴涛董威上海交通大学机械与动力工程学院上海200240

采用数值计算的方法分析了高亚声速来流条件下弯掠对转桨扇的流动特点,开展了不同自由来流马赫数下的高效对转桨扇桨距调节规律的研究。研究表明:在弯掠桨扇的内部流场,从约30%相对叶高位置处开始形成明显激波结构,但当弯掠桨扇通道内... 详细信息

采用数值计算的方法分析了高亚声速来流条件下弯掠对转桨扇的流动特点,开展了不同自由来流马赫数下的高效对转桨扇桨距调节规律的研究。研究表明:在弯掠桨扇的内部流场,从约30%相对叶高位置处开始形成明显激波结构,但当弯掠桨扇通道内峰值马赫数在1.2及以下时激波强度相对较弱,流动损失在可接受范围。由于桨距角对桨扇的推进效率影响显著,研究提出了可行有效的对转桨扇桨距调节方法,数值计算表明桨扇的推进效率均在75%以上。数值仿真预测的各马赫数下桨扇的推力值表明前叶推力对马赫数的变化更加敏感。

关键词：弯掠对转桨扇桨距调节激波损失推进效率马赫数

同方期刊数据库