检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

非定常非线性自由表面波动的有限差分法

力学学报 1986年第S1期 35-44页

作者：吕玉麟李宝元大连工学院工程力学研究所

本文提出解非定常非线性自由表面波动问题的新方法,适用于二维或三维容器内液体受瞬态外加扰动激发的波动。方法将跟踪自由表面随时间的演变,在它上面的运动和动力学条件严格满足其非线性原式。解法中引进坐标变换以取得固定的计算域。... 详细信息

本文提出解非定常非线性自由表面波动问题的新方法,适用于二维或三维容器内液体受瞬态外加扰动激发的波动。方法将跟踪自由表面随时间的演变,在它上面的运动和动力学条件严格满足其非线性原式。解法中引进坐标变换以取得固定的计算域。速度势将满足一种迭代格式的Poisson方程。用有限差分离散,进行快速Fourier变换(FFT),可化成三对角方程组求解。变量的时间更新利用预估-校正法实现。优点是大量减少计算工作量。本文附有二维和三维例题的计算结果验证本力法的有效性。

关键词：自由表面波计算域函数速度势方程式方程坐标变换坐标换算齐次边界条件迭代格式有限差分法差分法数值天气预报笛卡尔坐标系非定常

Effect of activated NH_3 on SO_2 removal by pulse corona discharge plasma in flue gas

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2000年第4期12卷 448-451页

作者： li Jie, WU Yan, WANG Ning\|hui, YANG li\|ming (institute of Electrostatics, dalian University of technology, dalian 116023, China) 大连理工大学辽宁大连 1 1 6 0 2

NH 3 activated electrode is placed in front of the electrode system of pulse corona discharge plasma. There are nozzles on the electrode. Positive DC high\|voltage is applied on the nozzle\|plate gap. NH\-3 is injected into the reactor through nozzles, at the same time, activated and treated. These nozzles were proposed in order to make the additional gas pass through corona discharge regions near the tip of nozzles and increase the mount of radicals. The aim is to improve the De\|SO\-2 efficiency by pulse discharge plasma in flue gas. The following topics are investigated and discussed in the paper: De\|SO\-2 effect of single NH\-3\|activated electrode, De\|SO\-2 effect of activated NH\-3, the relationship between stoichiometric ratio of NH\-3 to SO\-2 and De\|SO\-2 effect of activated NH\-3, mechanism of activated NH\-3 De\|SO\-2 effect. The experimental result indicates that the De\|SO\-2 efficiency can be increased 5%—10% by activated NH\-3 on the original base of De\|SO\-2 efficiency.

关键词： activated NH_3 De-SO_2 pulse discharge

STRESS SINGULARITY ANALYSIS AT CRACK TIP ON BI-MATERIAL INTERFACES BASED ON HAMILTONIAN PRINCIPLE

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 1996年第2期9卷 124-138页

作者： Zhang Hongwu Zhong Wanxie li Yunpeng, Research institute of Engineering Mechanics, dalian University of technology, dalian 116023 Res. Inst. of Engineering Mechanics Dalian University of Technology Dalian 116023

In this paper, the stress singularity analysis at the crack tip on elastic bi-material interfaces is considered. The governing equations of plane elasticity In sectorial domain are derived to be in Hamiltonian form via variable substitution and variational principle. The methods of separation of variables and conjugate symplectic eigen-function expansion are developed to solve the equations in sectorial domain. The general formulae for the solution of stress singularities at the crack tip on bi-material interfaces are put forward, and a new solution technique for fracture problems is presented.

关键词： interface crack fracture mechanics Hamiltonian principle

A hybrid nickel/iron-pyromellitic acid electrocatalyst for oxygen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 2481-2491页

作者： Guoqi li lin li Wenlong li Fusheng li Chunze Yuan Nian Zhang Hui Zhang Tsu-Chien Weng School of Physical Science and technology ShanghaiTech UniversityShanghai 201210China Center for Transformative Science ShanghaiTech UniversityShanghai 201210China State Key Lab of Fine Chemicals Institute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesDalian University of Technology(DUT)Dalian 116024China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

The migration of protons during the oxygen evolution reaction(OER)is a key factor that affects the performance of OER *** enhance proton transportation,we designed a catalyst based on nickel/iron-pyromellitic acid(NiFe-PMA)prepared by the electrochemical deposition *** catalyst exhibited a low overpotential of 188 mV at a current density of 10 mA·cm^(-2),a Tafel slope of 28.2 mV·dec^(-1),and long-term stability for 30 days with a current of 50 mA·cm^(-2).We characterized the NiFe-PMA catalyst using various techniques,including Fourier transform infrared(FTIR)spectroscopy,Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),X-ray absorption spectroscopy(XAS),transmission electron microscopy(TEM),scanning electron microscopy(SEM),and inductively coupled plasma-optical emission spectrometry(ICP-OES).Our results showed that NiFe-PMA contains nickel,iron atoms,and both coordinated and uncoordinated carboxylate ***,XPS data confirmed that carboxylate ligands could adjust the outer electronic structure of metal ions,resulting in the high valence state of Ni in *** result of XAS indicated that the nickel atoms present in the catalyst might be easier to maintain a higher chemical *** investigations using kinetic isotope effects(KIEs)and proton inventory revealed that the uncoordinated carboxylic protons played a crucial role in receiving protons during the OER,which promoted the proton transfer of the rate-determining step of the *** novel electrocatalysts provide a new strategy for designing more active and cost-effective catalysts for the OER.

关键词： nickel/iron-pyromellitic acid oxygen evolution reaction kinetic isotope effects

THE SYNTHESIS OF Ti-ZSM-5 STARTING WITH DE-[B]ZSM-5

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

Chinese Journal of Catalysis 1997年第4期 8-9页

作者： li Mingfeng, Guo Xinwen, Wang Xiangsheng * (institute of Industrial Catalyst, dalian University of technology, dalian 116012)

ＴＨＥＳＹＮＴＨＥＳＩＳＯＦＴｉ┐ＺＳＭ┐５ＳＴＡＲＴＩＮＧＷＩＴＨＤＥ┐［Ｂ］ＺＳＭ┐５ＬｉＭｉｎｇｆｅｎｇ，ＧｕｏＸｉｎｗｅｎ，ＷａｎｇＸｉａｎｇｓｈｅｎｇ＊（ＩｎｓｔｉｔｕｔｅｏｆＩｎｄｕｓｔｒｉａｌＣａｔａｌ... 详细信息

ＴＨＥＳＹＮＴＨＥＳＩＳＯＦＴｉ┐ＺＳＭ┐５ＳＴＡＲＴＩＮＧＷＩＴＨＤＥ┐［Ｂ］ＺＳＭ┐５ＬｉＭｉｎｇｆｅｎｇ，ＧｕｏＸｉｎｗｅｎ，ＷａｎｇＸｉａｎｇｓｈｅｎｇ＊（ＩｎｓｔｉｔｕｔｅｏｆＩｎｄｕｓｔｒｉａｌＣａｔａｌｙｓｔ，ＤａｌｉａｎＵｎｉｖｅｒｓ...

关键词： Ti ZSM 5 zeolite De ZSM 5 zeolite Isomorphous replacement Cyclohexanone Ammoxidation

Potential industrial applications of photo/electrocatalysis: Recent progress and future challenges

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第5期9卷 859-876页

作者： Jinhao li Jing Ren Shaoquan li Guangchao li Molly Meng-Jung li Rengui li Young Soo Kang Xiaoxin Zou Yong Luo Bin liu Yufei Zhao State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China Quzhou institute for Innovation in Resource Chemical Engineering Quzhou324000China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong999077China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian National Laboratory for Clean EnergyZhongshan Road 457Dalian116023China Environmental and Climate technology Track of Korea institute of Energy Korea Institute of Energy TechnologyNaju-siJeollanam do58217Republic of Korea State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun130012China

Nowadays,the rapid development of the social economy inevitably leads to global energy and environmental *** this reason,more and more scholars focus on the development of photocatalysis and/or electrocatalysis technology for the advantage in the sustainable production of high-value-added products,and the high efﬁciency in pollutants *** there is plenty of outstanding research has been put forward continuously,most of them focuses on catalysis performance and reaction mechanisms in laboratory *** industrial application of photo/electrocatalytic processes is still a challenge that needs to be overcome by social *** this regard,this review comprehensively summarized several explorations in theﬁeld of photo/electrocatalytic reduction towards potential industrial applications in recent *** attention is paid to the successful attempts and the current status of photo/electrocatalytic water splitting,carbon dioxide conversion,resource utilization from waste,etc.,by using advanced *** key problems and challenges of photo/electrocatalysis in future industrial practice are also discussed,and the possible development directions are also pointed out from the industry view.

关键词： Photocatalysis Electrocatalysis Industrial applications H2 economy

Path-Following Control With Obstacle Avoidance of Autonomous Surface Vehicles Subject to Actuator Faults

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 956-964页

作者： li-Ying Hao Gege Dong Tieshan li Zhouhua Peng the School of Marine Electrical Engineering Dalian Maritime UniversityDalian 116026China the School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731the Navigation CollegeDalian Maritime UniversityDalian 116026 the Yangtze Delta Region institute(Huzhou) Huzhou 313001China

This paper investigates the path-following control problem with obstacle avoidance of autonomous surface vehicles in the presence of actuator faults,uncertainty and external *** surface vehicles inevitably suffer from actuator faults in complex sea environments,which may cause existing obstacle avoidance strategies to *** reduce the influence of actuator faults,an improved artificial potential function is constructed by introducing the lower bound of actuator efficiency *** nonlinear state observer,which only depends on measurable position information of the autonomous surface vehicle,is used to address uncertainties and external *** using a backstepping technique and adaptive mechanism,a path-following control strategy with obstacle avoidance and fault tolerance is designed which can ensure that the tracking errors converge to a small neighborhood of *** with existing results,the proposed control strategy has the capability of obstacle avoidance and fault tolerance ***,the comparison results through simulations are given to verify the effectiveness of the proposed method.

关键词： Actuator faults autonomous surface vehicle(ASVs) improved artificial potential function nonlinear state observer obstacle avoidance

Study on the Diffraction Patterns of α"-Fe_(16)N_2 with Jack-1 and Jack-2 Structural Parameters

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & technology 2000年第4期16卷 362-366页

作者： Zhiquan liU and Douxing li (Laboratory of Atomic Imaging of Solids, institute of Metal Research, CAS, Shenyang 110015, China) Xiaolei XU, liang WANG and Zukun HEI (institute of Materials and technology, dalian Maritime University, dalian 116026, China) Laboratory of Atomic Imaging of Solids Institute of Metal Research CAS Shenyang 110015 China institute of Materials and technology Dalian Maritime University Dalian 116026 China

Two body centered tetragonal (bet) crystal structures of α'-Fe_(16)N_2 with x=0.25, z=0.3125 (Jack-1) and x=0.222, z=0.306 (Jack-2) respectively, were analyzed theoretically with EMS software package. The simulation of diffraction patterns indicates that both diffraction patterns of the same axis in these two structures obey bcc extinction rule. The conclusion is also obtained from the analyses of the diffracted waves. α'-Fe_(16)N_2 precipitates in the diffusion layer of ion-nitrided α-iron have been studied with transmission electron microscope (TEM). We have distinctly observed the electron diffraction patterns of α'-Fe_(16)N_2 in [100], [111], [110], [011], [210], [021], [311], [113], [331] and [133] zone axes with perfect symmetry, which indicate the parallel orientation relationship with α matrix:α'//α'// {100}.α'// {100}ｔα. The analyses of diffraction patterns, which obey bcc extinction rule, verify the bct structure of α'-Fe_(16)N_2 discovered by X-ray diffraction.

关键词： Study on the Diffraction Patterns of Jack N2 with Jack-1 and Jack-2 Structural Parameters Fe

CAD System of Microprogrammed Digital Systems

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science and technology 1987年第3期2卷 226-235页

作者：李明慧 dalian institute of technology

This paper describes the Computer Aided Design System of Microprogrammed Digital Systems(CADSMDS).CADSMDS consists of three subsystems:Register Transfer Level Description Language(RTLDL),General Micro Code Generation System(GMCGS)and General Microprogram SimulationSystem(GMSS).This system could be used for the generation of microcode,specification and design ofhardware system,and simulation and verification of microarchitecture and micro *** is an automaticdevelopment and design tool for microprogrammed digital *** proposed system is implemented inan IBM-PC/*** paper describes the design strategy,the features,the structure and some applicationsof CADSMDS.

关键词： this In RA ISPS CAD System of Microprogrammed Digital Systems