检索结果-南通市图书馆

Two-dimensional semiconductor heterostructures for photocatalytic CO_(2)conversion

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第8期67卷 2434-2447页

作者： Yang wu Mingyu wu Yongfu Sun Yi Xie Hefei National Research Center for physical Sciences at Microscale University of Science and Technology of ChinaHefei 230026China

The CO_(2)reduction into carbon-contained fuel via solar energy offers the powerful tools to realize the zero-emission carbon *** to the intriguing features of the two-dimensional(2d)heterostructures,it is susceptible to modulate the electronic structure as well as the surface geometry for optimizing the photocatalytic CO_(2)*** this perspective,we surveyed the fundamental insights of 2d semiconductor heterostructures,involving the fabrication strategies and classification of the 2d semiconductor ***,we have detailly discussed the overview of 2d semiconductor heterostructure for optimizing CO_(2)photocatalytic influenced factors,including the solar energy utilization,photogenerated carriers separation,and redox reaction ***,we showed the significant advantages of 2d heterostructures in elevating CO_(2)photoreduction performance,focusing on activity,selectivity and *** analyzing the limitations and developments,we ended by putting forward insights into the further researches about the CO_(2)photocatalysts and reactor design,even industrial applications.

关键词： two-dimensional semiconductor heterostructures photocatalysis CO_(2)conversion

Graph neural network-based scheduling for multi-UAV-enabled communications in d2d networks

在线全文

学校读者我要写书评

暂无评论

digital Communications and Networks 2024年第1期10卷 45-52页

作者： pei Li Lingyi Wang Wei wu Fuhui Zhou Baoyun Wang Qihui wu Nanjing University of posts and Telecommunications Nanjing210023China Nanjing University of Aeronautics and Astronautics Nanjing210016China

In this paper,we jointly design the power control and position dispatch for Multi-Unmanned Aerial Vehicle(UAV)-enabled communication in device-to-device(d2d)*** objective is to maximize the total transmission rate of downlink Users(dUs).Meanwhile,the Quality of Service(QoS)of all d2d users must be *** comprehensively considered the interference among d2d communications and downlink *** original problem is strongly non-convex,which requires high computational complexity for traditional optimization *** to make matters worse,the results are not necessarily globally *** this paper,we propose a novel Graph Neural Networks(GNN)based approach that can map the considered system into a specific graph structure and achieve the optimal solution in a low complexity ***,we first construct a GNN-based model for the proposed network,in which the transmission links and interference links are formulated as vertexes and edges,***,by taking the channel state information and the coordinates of ground users as the inputs,as well as the location of UAVs and the transmission power of all transmitters as outputs,we obtain the mapping from inputs to outputs through training the parameters of *** results verified that the way to maximize the total transmission rate of dUs can be extracted effectively via the training on ***,it also shows that the performance of proposed GNN-based method is better than that of traditional means.

关键词： Unmanned aerial vehicle d2 dcommunication Graph neural network power control position planning

phase-field lattice-Boltzmann study on fully coupled thermal-solute-convection dendrite growth of Al-Cu alloy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Foundry 2024年第2期21卷 125-136页

作者： Yin-qi Qiu Meng-wu wu Xun-peng Qin Shou-mei Xiong Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000HubeiChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

dendrite growth is a complex liquid-solid phase transition process involving multiple physical factors.A phase-field lattice-Boltzmann method was developed to simulate the two-and three-dimension dendrite growth of Al-Cu *** effect of fully coupled thermal-solute-convection interaction on the dendrite growth was investigated by incorporating a parallel-adaptive mesh refinement algorithm into the numerical *** accurately reproducing the latent heat release,solute diffusion and convective transport behaviors at the liquidsolid interface,the interaction mechanism among thermal-solute-convection transport as well as their coupling effects on the dendrite growth dynamics were *** simulation results show that the release of latent heat slows down the dendrite growth rate,and both natural and forced convection disrupt the symmetrical growth of *** combination makes the growth of dendrites more complex,capturing important physical aspects such as recalescence,dendrite tip splitting,dendrite tilting,dendrite remelting,and solute plume in the simulation *** on the robustness and powerful ability of the numerical model,the formation mechanisms of these physical aspects were revealed.

关键词： simulation phase field dendrite growth thermal-solute-convection interaction

The variation of dOM during long distance water transport by the China South to North Water diversion Scheme and impact on drinking water treatment

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2024年第5期18卷 85-100页

作者： Hankun Yang Yujuan Li Hongyu Liu Nigel J.d.Graham Xue wu Jiawei Hou Mengjie Liu Wenyu Wang Wenzheng Yu State Key Laboratory of Environmental Aquatic Chemistry Key Laboratory of Drinking Water Science and TechnologyResearch Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085China School of Environment and Municipal Engineering Qingdao Technological UniversityQingdao266033China Colleges of Forestry Northeast Forestry UniversityHarbin150006China department of Civil and Environmental Engineering Imperial College LondonSouth Kensington CampusLondonSW7 2AZUK School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing100081China State Key Laboratory of Separation Membrane processes School of Environment Science and EngineeringTiangong UniversityTianjin300387China

In this study,samples were taken from three locations,upstream to downstream,along the central route project of the China South to North Water diversion(SNWd)scheme in summer and *** were used to reveal the variations of dissolved organic matter(dOM)during the water transfer process,and the effects of these variations on drinking water treatment and disinfection by-products formation potential(dBps-Fp).The results showed that polysaccharides accumulate in summer and reduce in winter with flow distance,which has an important effect on the overall properties of dOM,as well as on the performance of coagulation,ultrafiltration,and the formation of *** substances,and their hydrophilic content,also increased in summer and decreased in winter with flow *** contrast,the concentration of small organic substances(MW≤1000 da)increased in both summer and winter with flow distance,which affected both nanofiltration(NF)membrane fouling and *** results provide a useful case study of spatial and temporal changes in raw water dOM during long distance water transfer and their impact on the treatment and quality of drinking water from the SNWd.

关键词： Long-distance water transfer The China South to North Water diversion Scheme Coagulation Membrane filtration disinfection by-products

UNIFORM SUpERCONVERGENCE ANALYSIS OF A TWO-GRId MIXEd FINITE ELEMENT METHOd FOR THE TIME-dEpENdENT BI-WAVE pROBLEM MOdELING d-WAVE SUpERCONdUCTORS

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 Computational Mathematics 2024年第2期42卷 415-431页

作者： Yanmi wu dongyang Shi pLA Information Engineering University Zhengzhou 450001China School of Mathematics and Information Sciences Yantai UniversityYantai 264005China

In this paper,a two-grid mixed finite element method(MFEM)of implicit Backward Euler(BE)formula is presented for the fourth order time-dependent singularly perturbed Bi-wave problem for d-wave superconductors by the nonconforming EQ_(1)^(rot) *** this approach,the original nonlinear system is solved on the coarse mesh through the Newton iteration method,and then the linear system is computed on the fine mesh with Taylor’s *** on the high accuracy results of the chosen element,the uniform superclose and superconvergent estimates in the broken H^(1)-norm are derived,which are independent of the negative powers of the perturbation parameter appeared in the considered *** results illustrate that the computing cost of the proposed two-grid method is much less than that of the conventional Galerkin MFEM without loss of accuracy.

关键词： Time-dependent Bi-wave problem Two-grid mixed finite element method Uniform superclose and superconvergent estimates

principal components of nuclear mass models

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2024年第7期67卷 65-71页

作者： Xin-Hui wu pengwei Zhao department of physics Fuzhou UniversityFuzhou 350108China State Key Laboratory of Nuclear physics and Technology School of PhysicsPeking UniversityBeijing 100871China

principal component analysis(pCA)is employed to extract the principal components(pCs)present in nuclear mass models for the first *** effects from different nuclear mass models are reintegrated and reorganized in the extracted *** pCs are recombined to build new mass models,which achieve better accuracy than the original theoretical mass *** comparison indicates that using the pCA approach,the effects contained in different mass models can be collaborated to improve nuclear mass predictions.

关键词： nuclear mass principal component analysis nuclear models statistical methods

State-Based Opacity Verification of Networked discrete Event Systems Using Labeled petri Nets

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5期11卷 1274-1291页

作者： Yifan dong Naiqi wu Zhiwu Li The authors are with the Institute of Systems Engineering Macao University of Science and TechnologyTaipa 999078MacaoChina

The opaque property plays an important role in the operation of a security-critical system,implying that pre-defined secret information of the system is not able to be inferred through partially observing its *** paper addresses the verification of current-state,initial-state,infinite-step,and K-step opacity of networked discrete event systems modeled by labeled petri nets,where communication losses and delays are *** on the symbolic technique for the representation of states in petri nets,an observer and an estimator are designed for the verification of current-state and initial-state opacity,***,we propose a structure called an I-observer that is combined with secret states to verify whether a networked discrete event system is infinite-step opaque or K-step *** to the utilization of symbolic approaches for the state-based opacity verification,the computation of the reachability graphs of labeled petri nets is avoided,which dramatically reduces the computational overheads stemming from networked discrete event systems.

关键词： infinite system symbolic

LONp1 ameliorates liver injury and improves gluconeogenesis dysfunction in acute-on-chronic liver failure

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第2期137卷 190-199页

作者： Muchen wu Jing wu Kai Liu Minjie Jiang Fang Xie Xuehong Yin Jushan wu Qinghua Meng department of Liver disease Beijing You-An HospitalCapital Medical UniversityBeijing 100069China Beijing Institute of Hepatology Beijing You-An HospitalCapital Medical UniversityBeijing 100069China department of General Surgery Beijing You-An HospitalCapital Medical UniversityBeijing 100069China

Background:Acute-on-chronic liver failure(ACLF)is a severe liver disease with complex *** hypoglycemia is common in patients with ACLF and often predicts a worse *** evidence suggests that glucose metabolic disturbance,especially gluconeogenesis dysfunction,plays a critical role in the disease progression of *** protease-1(LONp1)is a novel mediator of energy and glucose ***,whether gluconeogenesis is a potential mechanism through which LONp1 modulates ACLF remains ***:In this study,we collected liver tissues from ACLF patients,established an ACLF mouse model with carbon tetrachloride(CCl 4),lipopolysaccharide(LpS),and d-galactose(d-gal),and constructed an in vitro hypoxia and hyperammonemia-triggered hepatocyte injury ***1 overexpression and knockdown adenovirus were used to assess the protective effect of LONp1 on liver injury and gluconeogenesis *** histopathology,biochemical index,mitochondrial morphology,cell viability and apoptosis,and the expression and activity of key gluconeogenic enzymes were detected to explore the underlying protective mechanisms of LONp1 in ***:We found that LONp1 and the expressions of gluconeogenic enzymes were downregulated in clinical ACLF liver ***,LONp1 overexpression remarkably attenuated liver injury,which was characterized by improved liver histopathological lesions and decreased serum alanine aminotransferase(ALT)and aspartate aminotransferase(AST)in ACLF ***,mitochondrial morphology was improved upon overexpression of ***,the expression and activity of the key gluconeogenic enzymes were restored by LONp1 ***,the hepatoprotective effect was also observed in the hepatocyte injury model,as evidenced by improved cell viability,reduced cell apoptosis,and improved gluconeogenesis level and activity,while LONp1 knockdown worsened liver injury and gluconeogenesis ***

关键词： Acute-on-chronic liver failure Lon protease-1 Gluconeogenesis disturbance Mitochondrial dysfunction Metabolism

2-Independent domination in Trees

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2024年第2期12卷 485-494页

作者： Gang Zhang Baoyindureng wu College of Mathematics and System Sciences Xinjiang UniversityUrumqi830046XinjiangChina

A subset d■V(G)in a graph G is a dominating set if every vertex in V(G)I d is adjacent to at least one vertex of S.A subset S■V(G)in a graph G is a 2-independent set if△(G[S])<*** 2-independence numberα2(G)is the ... 详细信息

A subset d■V(G)in a graph G is a dominating set if every vertex in V(G)I d is adjacent to at least one vertex of S.A subset S■V(G)in a graph G is a 2-independent set if△(G[S])dependence numberα2(G)is the order of a largest 2-independent set in ***,a subset d■V(G)in a graph G is a 2-independent dominating set if d is both dominating and *** 2-independent domination number i^(2)(G)is the order of a smallest 2-independent dominating set in *** this paper,we characterize all trees T of order n with i^(2)(T)=n/***,we prove that for any tree T of order n≥2,i^(2)(T)≤2/3α2(T),and this bound is sharp.

关键词： domination-Independent domination 2-Independent domination:2-Independence.Trees