检索结果-南通市图书馆

Output feedback stabilization for power-integrator systems with unknown measurement sensitivity

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2021年第9期64卷 252-254页

作者： Yu SHAO Zong-Yao sun Xue-Jun XIE zhen-guo LIU Institute of Automation Qufu Normal University Department of Automation Shanxi University

Dear editor,The technical limitations on sensors mean that some state variables will not be detected in any controlled system, so the actual values of an output function will always deviate somewhat from the nominal values. A practical example was given in [1], where the output of an infrared sensor that measures the distance between parts in a magnetic bearing suspension system suffers from measurement error [1].

关键词： Output feedback homogeneous observer unknown measurement sensitivity adding a power integrator reduced-order observer

Active Dynamic Aggregation Model for Distributed Integrated Energy System as Virtual Power Plant

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 Modern Power Systems and Clean Energy 2020年第5期8卷 831-840页

作者： Haotian Zhao Bin Wang Xuanyuan Wang Zhaoguang Pan Hongbin sun zhen Liu Qinglai guo State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical EngineeringTsinghua UniversityBeijingChina State Grid Jibei Electric Power Co. Ltd.BeijingChina

Distributed integrated multi-energy systems(DIMSs)can be regarded as virtual power plants to provide additional flexibility to the power *** paper proposes a robust active dynamic aggregation model for the DIMSs to describe the maximum feasible *** aggregation model includes the power constraints,energy constraints,and ramping constraints to aggregate different types of resources in the *** proposed generator-like and storage-like model does not depend on the ancillary service market and can be directly incorporated into the economic dispatch model of the power system.A novel algorithm based on the column-and-constraint generation algorithm and convex-concave procedure is proposed to solve the two-stage robust optimization problem,which is more efficient than the KKT-based ***,a case study of an actual DIMS is developed to demonstrate the effectiveness of the proposed model.

关键词： Aggregation distributed integrated energy system(DIMS) robust optimization virtual power plant

Surface embedded binary Co-Cu hydroxy phosphate over surface of oxy/hydroxides for efficient nitrate reduction to ammonia

在线全文

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 195-207页

作者： Chun Zhu Yifei Yang Yike Jing zhen Zeng Xuesong Yi Wei sun Fei Yang Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province School of Environmental Science and EngineeringHainan UniversityHaikou 570228China

Electrochemical nitrate reduction reaction(NO3RR)to ammonia is a promising approach to address excess Ncontamination in aqueous environment but suffers from a limited ammonia yield and selectivity due to the low concentration and sluggish *** work reports a three-dimensional porous electrode with binary Co_(2)Cu_(1)hydroxy phosphate embedded into the surface of Ni_(3)Co_(1)oxy/hydroxides(CoCu-PH@NiCo/Ni,“PH”means phosphate-hydroxide),which delivers a yield of 4.13 mg·h^(-1)·cm^(-2)with a high Faraday efficiency of 92.6%under a low nitrate concentration of 40 mM and provide an impressive *** embedded structure of the as-prepared catalyst exhibits unique metal coordination ligands and valence states different from the unitary *** electrochemical in situ infrared spectra and theoretical calculations revealed that the Co sites with the ability to dissociate water molecular to form adsorbed OH*can effectively provide the required protons for the deoxygenation and hydrogenation steps during NO3-conversion,thereby,effectively reducing the energy barrier of the key transition states in the NO3RR process to improve the intrinsic *** demonstrate that the rational design of binary components with the appropriate ability to activate water molecules as well as the threedimensional porous skeletal structure are expected to promote effectively the low-concentration nitrates conversion to ammonia.

关键词： nitrate reduction hydroxy phosphate surface embedded water dissociation active hydroxy adsorbed

Corotational nonlinear analyses of laminated shell structures using a 4-node quadrilateral flat shell element with drilling stiffness

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

Acta Mechanica Sinica 2014年第3期30卷 418-429页

作者： zhen Wang Qin sun School of Aeronautics Northwestern Polytechnical University

A new 4-node quadrilateral flat shell element is developed for geometrically nonlinear analyses of thin and moderately thick laminated shell structures. The fiat shell element is constructed by combining a quadrilateral area co- ordinate method （QAC） based membrane element AGQ6- II, and a Timoshenko beam function （TBF） method based shear deformable plate bending element ARS-Q12. In order to model folded plates and connect with beam elements, the drilling stiffness is added to the element stiffness matrix based on the mixed variational principle. The transverse shear rigidity matrix, based on the first-order shear deformation theory （FSDT）, for the laminated composite plate is evaluated using the transverse equilibrium conditions, while the shear correction factors are not needed. The conventional TBF methods are also modified to efficiently calculate the element stiffness for laminate. The new shell element is extended to large deflection and post-buckling analyses of isotropic and laminated composite shells based on the element independent corotational formulation. Numerical re- sults show that the present shell element has an excellent numerical performance for the test examples, and is applicable to stiffened plates.

关键词： Geometrically nonlinear. Quadrilateral area co-ordinate method Timoshenko beam function Laminatedcomposite Drilling degree of freedom ~ Corotational for-mulation

Synthesis,Photochromism and Switchable Photoluminescence of a Cd-based Metalloviologen Complex

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2021年第9期40卷 1177-1182,1109页

作者： sun Jing YU Cao-Ming CAI Li-zhen guo guo-Cong State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemical Engineering Fuzhou UniversityFuzhou 350116China

A novel metalloviologen complex{[Cd(PhSQ)(HTBC)(H_(2)O)_(2)]·1.25 H_(2)O}n(1)based on N-(4-sulfophenyl)-4,4’-bipyridinium(PhSQ)and monoprotonated trimesic acid(HTBC)has been prepared and structurally *** 1 has been characterized by elemental analysis,IR,thermogravimetric analyses,UV-Vis spectra and X-ray *** coordination geometry of Cd(Ⅱ)ion is a pentagonal *** 1 displays a zigzag chain along the b axis,and such chains are extended into a 2 D layer supramolecular network through hydrogen bonding and π…π ***,complex 1 exhibits reversible photochromic and switchable luminescent behaviors via UV light irradiation at room temperature induced by the photogenerated radicals via a photo-induced electron transfer(PET)mechanism.

关键词： crystal structure metalloviologen photochromism switchable photoluminescence

同方期刊数据库

A Mn-porphyrinic metal–organic framework immobilizing glucose oxidase for combined photodynamic/chemodynamic/starvation therapy

在线全文

学校读者我要写书评

暂无评论

Tungsten 2025年第1期 183-194页

作者： Xin-Ran sun Hao-Ming Yuan guo-Da Zhang Chao Wang Shu-Juan sun Peng-Fei Shi Shandong Provincial Key Laboratory of Detection Technology for Tumor Markers School of Chemistry and Chemical Engineering Linyi University

The combination of photodynamic therapy（PDT） and chemodynamic therapy（CDT） in tumor treatment has attracted considerable ***,tumor hypoxia and glutathione（GSH） overproduction in the tumor tissue restricted the progress of their ***,a Mn-porphyrinic metal-organic framework（Mn-TCPP） was constructed by the one-pot method and further used for immobilizing glucose oxidase（GOx） to obtain GOx@*** would rapidly exhaust endogenous glucose into hydrogen peroxide（H2O2） and gluconic acid,thus shutting off the energy supply of tumor cells for starvation ***-TCPP catalyzed H2O2to produce oxygen,regulating the hypoxic tumor microenvironment and in turn improving1O2generation under laser ***,Mn-TCPP can reduce reactive oxygen species consumption owing to the redox reaction between Mn3+and GSH,thus greatly enhancing ***,benefiting from GOx-mediated starvation therapy,Mn2+produced by Mn3+reduction can react with sufficient intracellular H2O2to generate ·OH with high cytotoxicity through a Fenton-like *** treatment by GOx@Mn-TCPP under laser irradiation in vitro,the cell viability of 4T1 and A549 tumor cells reached to 20%,reflecting GOx@Mn-TCPP could give full play to the advantages of PDT/CDT/starvation *** results in vivo demonstrated that GOx@Mn-TCPP mediated synergistic cascade therapy could significantly inhibit tumor growth and improve the therapeutic effect.

关键词：

Effect of Cesium Modification on CuO/CeO2 Catalysts for the Catalytic Decomposition of N2O

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 2019年第1期35卷 47-52页

作者： guo Peiwen QIN Feng sun Chao HUANG zhen SHEN Wei XU Hualong Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Laboratory of Advanced Materials Collaborative Innovation Center of Chemistry for Energy MaterialsDepartment of Chemistry Fudan UniversityShanghai 200433P.R.China

A series of Cs-modified CuO/CeO2 mixed oxide catalysts was prepared for enhancing the stable activity of N2O *** was found that Cs modification promoted the catalytic performance of CuO/CeO2 catalysts significantly,The l%Cs-CuO/CeO2 catalyst exhibited the best activity,and the conversion of N2O reached 100%at 380℃ in the presence of 2% *** catalytic behaviors were investigated by means of XRD,N2 adsorption isotherms,XPS,H2-TPR(TPR:temperature-prograrmmed reduction),CO-IR,O2-TPD(TPD:temperature-programmed desorption)and diffused reflectance infrared Fourier transform spectorscopy(DRiFTs).The results revealed that Cs modification promoted the activity and the oxygen resistance by enhancing the desorption of surface oxygen species and increasing the content of Ce^3+.CO-DRIFTs revealed that Ce^3+could efficiently facilitate the regeneration of active Cu^+sites by an oxygen migration *** possible reaction mechanism was also discussed.

关键词： Cs-Modified CuO/CeO2 N2O decomposition Reaction mechanism

High-temperature deformation behavior of a beta Ti-3.0Al-3.5Cr-2.0Fe-0.1B alloy

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

Rare Metals 2018年第3期37卷 217-224页

作者： Wen-Tao Qu Xu-Guang sun Song-Xiao Hui zhen-guo Wang Yan Li School of Mechanical Engineering Xi'an Shiyou University State Key Laboratory of Nonferrous Metals and Processes General Research Institute for Nonferrous Metals School of Materials Science and Engineering Beihang University

The high-temperature deformation behavior of a beta Ti-3.0 Al-3.5 Cr-2.0 Fe-0.1 B alloy was investigated by a Gleeble-1500 D thermal simulator. The height reduction was 50%, corresponding to a true strain of 0.693. The strain rate ranging from 0.01 to 10.00 s^-1 and the deformation temperature ranging from 800 to 950 ℃ were *** flow stress and the apparent activation energy for deformation, along with the constitutive equation, were used to analyze the behavior of the Ti-3.0 Al-3.5 Cr-2.0 Fe-0.1 B alloy. The processing map was established. The effect of strain rate on the microstructure at 850 ℃ was *** flow stress-strain curves indicated that the peak flow stresses increased along with an increase in the strain rate and decreased as the deformation temperature *** on the true stress-true strain curves, the constitutive equation was established and followed as the ε= 6.58×10-（10）[sinh（0.0113σ）]-（3.44）exp（-245481.3/RT）. The processing map exhibited the ＂unsafe＂ region at the strain rate of10 s^-1 and the temperature of 850 ℃,and the rest region was ＂safe＂. The deformation microstructure demonstrated that both dynamic recovery（DRV） and dynamic recrystallization（DRX） existed during deformation. At the lower strain rate of 0.01 s^-1, the main deformation mechanism was the DRV, and the DRX was the dominant deformation mechanism at the higher strain rate of 1.00 s^-1.

关键词： Titanium alloy Hot deformation Constitutive equation Processing map Microstructure

Dielectric Properties of Unfilled Tetragonal Tungsten Bronze Ba4PrFe(0.5)Nb(9.5)O(30) Ceramics

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) 2017年第4期32卷 904-909页

作者：胡长征 ZHU Qihua sun zhen guo Zhe LIU Laijun FANG Liang Ministry-province Jointly-constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials Guangxi Zhuang Autonomous Region Guilin University of Technology Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Ministry of Education Guilin University of Technology Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices College of Material Science and Engineering Guilin University of Technology

In order to found new dielectrics ceramics in tungsten bronze structure, unfilled tungsten bronze（TB） ceramics with nominal formula Ba4PrFe（0.5）Nb（9.5）O（30） were prepared by the solid state reaction method. The microstructure and dielectric properties were studied using powder X-ray diffraction, field emission scanning electron microscope, and variable temperature dielectric test system. The results show that the ceramics have a single phase and belong to the space group of P4bm with the cell of a = b = 12.4839（3）？, c = 3.9409（5）？, V = 614.192（2）？3. The frequency dependent dielectrics properties show that the ceramics have a Debye-like relaxation at room temperature, while the temperature dependent dielectrics properties indicate that the ceramics are a relaxor and the relaxation is due to the nanopolars and oxygen vacancies. The ceramics have a potential application in electronic ceramics as temperature-stable multilayer ceramic capacitors.

关键词： unfilled tetragonal tungsten bronze dielectric properties ceramic