检索结果-南通市图书馆

Effects of dimethyl ether and ethanol additions on soot transition in ethylene counterflow diffusion flames

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(Technological Sciences) 2024年第4期67卷 1094-1112页

作者： GUO LinGe ying YaoYao CHEN Chen zhao Xuan LIU Dong MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

This paper investigates the effect of blending dimethyl ether(DME)and ethanol on the soot transition periods in ethylene counterflow diffusion flames by using a novel optical diagnostic *** soot critical transition point in different conditions is identified experimentally and *** kinds of flames are carried out to gain the soot critical transition point in counterflow diffusion flames by changing oxygen fraction(Xo)and changing volume flow rates of fuel and oxidizer(Qv).The red-green-blue(RGB)ratio method is used to precisely identify the soot critical transition point,and chemical kinetic simulations are performed to analyze the detailed reaction *** results show that compared to the ethylene flame,the soot critical transition point occurs at a higher Xoand a lower Qvwhen DME or ethanol is *** addition of DME and ethanol can inhibit soot formation,due to the degree of soot formation reaction being lower than the degree of the oxidation reaction in the blending flames.

关键词： optical diagnosis sooting tendency counterflow diffusion flame dimethyl ether ethanol

Transition metal clusters with precise numbers of atoms anchored on graphdiyne as multifunctional electrocatalysts for OER/ORR/HER:a computational study

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3107-3117页

作者： xin-Yang Liu Jing-Wei Liu Gang Li Jing-Xiang zhao College of Chemistry and Chemical Engineering Harbin Normal UniversityHarbin 150025China

Subnanometer metal clusters play an increasingly important role in heterogeneous catalysis due to their high catalytic activity and *** this work,by means of the density functional theory(DFT) calculations,the catalytic activities of transition metal clusters with precise numbers of atoms supported on graphdiyne(TM_(1-4)@GDY,TM=V,Cr,Mn,Fe,Co,Ni,Cu,Ru,Rh,Pd,Ir,Pt) were investigated for oxygen evolution reactions(OER),oxygen reduction reactions(ORR) and hydrogen evolution reactions(HER).The computed results reveal that the Pd_(2),Pd_(4) and Pt_(1) anchored graphdiyne can serve as trifunctional catalysts for OER/ORR/HER with the overpotentials of 0.49/0.37/0.06,0.45/0.33/0.12 and 0.37/0.43/0.01 V,respectively,while Pd_(1) and Pt_(2)@graphdiyne can exhibit excellent catalytic performance for water splitting(OER/HER) with the overpotentials of 0.55/0.17 and 0.43/0.03 *** addition,Ni_(1) and Pd_(3) anchored GDY can perform as bifunctional catalysts for metal-air cells(OER/ORR) and fuels cells(ORR/HER) with the overpotentials of 0.34/0.32 and 0.42/0.04 V,***,by precisely controlling the numbers of atoms in clusters,the TM_(1-4) anchored graphdiyne can serve as promising multifunctional electrocatalysts for OER/ORR/HER,which may provide an instructive strategy to design catalysts for the energy conversation and storage devices.

关键词： Density functional theory Graphdiyne Single-cluster catalysts Multifunctional electrocatalysts Overpotential

Proteomic profiling of cerebrospinal fluid in pediatric myelin oligodendrocyte glycoprotein antibody-associated disease

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2024年第3期20卷 259-271页

作者： Yi-Long Wang Meng-ying Zhu Zhe-Feng Yuan Xiao-Yan Ren Xiao-Tong Guo Yi Hua Lu Xu Cong-ying zhao Li-Hua Jiang xin Zhang Guo-Xia Sheng Pei-Fang Jiang Zheng-Yan zhao Feng Gao Department of Neurology Children's HospitalZhejiang University School of MedicineHangzhou 310052China Children's Hospital Zhejiang University School of MedicineHangzhou 310052China Children's Hospital National Clinical Research Center for Child HealthZhejiang University School of MedicineHangzhou 310052China

Background Myelin oligodendrocyte glycoprotein(MOG)antibody-associated disease(MOGAD)is an autoimmune demy-elinating disorder of the central nervous *** Extracted proteins from 34 cerebrospinal fluid(CSF)samples[patients with MOGAD(MOG group,n=12);healthy controls(HC group,n=12);patients with MOG seronegative and metagenomics next-generation sequencing-negative inflammatory neurological diseases(IND group,n=10)]were processed and subjected to label-free quantitative *** partial least squares-discriminant analysis(PLS-DA)and orthogonal PLS-DA(O-PLS-DA)models were also performed based on proteomics *** analysis of differentially expressed proteins(DEPs)was performed using Gene Ontology,InterPro,and Kyoto Encyclopedia Genes and *** enzyme-linked immunosorbent assay was used to determine the complement levels in serum from patients with *** Four hundred and twenty-nine DEPs(149 upregulated and 280 downregulated proteins)were identified in the MOG group compared to the HC group according to the P value and fold change(FC).Using the O-PLS-DA model,872 differentially abundant proteins were identified with variable importance projection(VIP)scores>*** proteins(gamma-glutamyl hydrolase,cathepsin F,interalpha-trypsin inhibitor heavy chain 5,latent transforming growth factor beta-binding protein 4 and leukocyte-associated immunoglobulin-like receptor 1)overlapping between the top 30 DEPs with top-ranked P value and FC and top 30 proteins in PLS-DA VIP lists were *** analysis revealed that the dysregulated proteins in the MOG group were primarily involved in complement and coagulation cascades,cell adhesion,axon guidance,and glycosphingolipid biosynthesis compared to the HC *** The proteomic alterations in CSF samples from children with MOGAD identified in the current study might provide opportunities for developing novel biomarker candidates.

关键词： Acute disseminated encephalomyelitis Cerebrospinal fluid Complement cascades Myelin oligodendrocyte glycoprotein-associated disease Proteomics

Enhanced photocatalytic nitrogen fixation performance via in situ constructing BiO_(2-x)/NaNbO_(3) heterojunction

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 Chemical Engineering 2024年第5期69卷 92-100页

作者： Jiayu Zhang Zhihao Zeng Lin Yue Chunran zhao xin Hu Leihong zhao Xiuwen Wang Yiming He Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China Heilongjiang Provincial Key Laboratory of Surface Active Agent and Auxiliary School of Chemistry and Chemistry EngineeringQiqihar UniversityQiqihar 161006China Department of Materials Science and Engineering Zhejiang Normal UniversityJinhua 321004China

The fabrication of heterojunction catalysts is an effective strategy to enhance charge separation efficiency,thereby boosting the performance of *** this study,BiO_(2-x)nanosheets were synthesized through a hydrothermal process and loaded onto NaNbO_(3) microcube to construct a series of BiO_(2-x)/NaNbO_(3) heterojunctions for photocatalytic N_(2) *** indicated that 2.5%BiO_(2-x)/NaNbO_(3) had the highest photocatalytic *** NH_(3) production rate under simulated solar light reached 406.4μmol·L^(-1)·g^(-1)·h^(-1),which reaches 2.6 and 3.8 times that of NaNbO_(3) and BiO_(2-x),***_(2-x)nanosheets primarily act as electron trappers to enhance the separation efficiency of charge *** strong interaction between BiO_(2-x)and NaNbO_(3) facilitates the electron migration between ***,the abundant oxygen vacancies in BiO_(2-x)nanosheets may facilitate the adsorption and activation of N_(2),which may be another possible reason of the high photocatalytic activity of the BiO_(2-x)/NaNbO_(3).This study may offer new insights for the development of semiconductor materials in photocatalytic nitrogen fixation.

关键词： Catalyst Solar energy Hydrothermal BiO_(2-x)/NaNbO_(3) Photocatalytic N_(2)-fixation

Nontraditional energy-assisted mechanical machining of difficult-to-cut materials and components in aerospace community:a comparative analysis

在线全文

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2024年第2期6卷 190-271页

作者： Guolong zhao Biao zhao Wenfeng Ding Lianjia xin Zhiwen Nian Jianhao Peng Ning He Jiuhua Xu College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China

The aerospace community widely uses difficult-to-cut materials,such as titanium alloys,high-temperature alloys,metal/ceramic/polymer matrix composites,hard and brittle materials,and geometrically complex components,such as thin-walled structures,microchannels,and complex *** machining is the main material removal process for the vast majority of aerospace ***,many problems exist,including severe and rapid tool wear,low machining efficiency,and poor surface *** energy-assisted mechanical machining is a hybrid process that uses nontraditional energies(vibration,laser,electricity,etc)to improve the machinability of local materials and decrease the burden of mechanical *** provides a feasible and promising method to improve the material removal rate and surface quality,reduce process forces,and prolong tool ***,systematic reviews of this technology are lacking with respect to the current research status and development *** paper reviews the recent progress in the nontraditional energy-assisted mechanical machining of difficult-to-cut materials and components in the aerospace *** addition,this paper focuses on the processing principles,material responses under nontraditional energy,resultant forces and temperatures,material removal mechanisms,and applications of these processes,including vibration-,laser-,electric-,magnetic-,chemical-,advanced coolant-,and hybrid nontraditional energy-assisted mechanical ***,a comprehensive summary of the principles,advantages,and limitations of each hybrid process is provided,and future perspectives on forward design,device development,and sustainability of nontraditional energy-assisted mechanical machining processes are discussed.

关键词： difficult-to-cut materials geometrically complex components nontraditional energy mechanical machining aerospace community

Reinforcement of High Impact Polystyrene by Aramid Nanoparticle Fillers Prepared via an In situ Bottom-up Approach

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第8期42卷 1167-1176页

作者： Xiang-Jun Gong Zhi-Ping zhao Chang-Mei Sun ying Zhang Rong-Jun Qu ying Wang School of Chemistry and Materials Science Ludong UniversityYantai 264025China

In this work,aramid nanoparticles(ANPs)were prepared in dimethyl formamide(DMF)solution containing high impact polystyrene(HIPS)via a bottom-up *** electron microscopy(TEM)images showed that the obtained ANPs were evenly distributed in the HIPS matrix without any *** composition of the ANPs,i.e.,poly(p-phenyl-p-phenylenediamine)(PPTA),was confirmed by Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and X-ray diffractometer(XRD).The ANP/HIPS composites,obtained after ethanol precipitation,were added to neat HIPS as fillers to fabricate ANP/HIPS composite *** surface roughness and the glass transition temperature(T_g)of the sheets were characterized by atomic force microscope(AFM)and differential scanning calorimetry(DSC),*** with neat HIPS,the mechanical properties of the composite sheet were significantly improved,and the Young's modulus increased from 246.55 MPa to 2025.12 MPa,the tensile strength increased from 3.07 MPa to 29.76 MPa,and the toughness increased from 0.32 N/mm^2 to 3.92 N/mm^2,with an increase rate of 721%,869%and 1125%,***,the thermal stability of the composites improved with the increase in ANP content.

关键词： High impact polystyrene PPTA nanoparticle Reinforce Mechanical property

Mitochondrial GRIM19 Loss Induces Liver Fibrosis through NLRP3/IL33 Activation via Reactive Oxygen Species/NF-κB Signaling

在线全文

学校读者我要写书评

暂无评论

Journal of Clinical and Translational Hepatology 2024年第6期12卷 539-550页

作者： Xiaohui Xu Jinmei Feng xin Wang xin Zeng ying Luo xinyu He Meihua Yang Tiewei Lv Zijuan Feng Liming Bao Li zhao Daochao Huang Yi Huang Institute of Pediatrics Children’s Hospital of Chongqing Medical UniversityNational Clinical Research Center for Child Health and DisordersMinistry of Education Key Laboratory of Child Development and DisordersChongqing Key Laboratory of Pediatric Metabolism and Inflammatory DiseasesChongqingChina Department of Cardiology Children’s Hospital of Chongqing Medical UniversityNational Clinical Research Center for Child Health and DisordersMinistry of Education Key Laboratory of Child Development and DisordersNational Clinical Key Cardiovascular SpecialtyLaboratory of Children’s Important Organ Development and Diseases of Chongqing Municipal Health CommissionChongqingChina Department of Laboratory Medicine Chongqing Western HospitalChongqingChina Key Laboratory of Molecular Biology for Infectious Diseases Ministry of EducationInstitute for Viral HepatitisChongqing Medical UniversityChongqingChina Department of Laboratory Medicine The Third People’s Hospital of ChengduChengduSichuanChina Departments of Neurology Epilepsy CenterBarnes-Jewish Hospital and Washington University School of MedicineSt.LouisMOUSA Department of Clinical Pathology and Laboratory Medicine Weill Cornell Medical College of Cornell UniversityNew YorkNYUSA Departments of Medicine(Oncology) Washington University School of MedicineSt.LouisMOUSA

Background and Aims:Hepatic fibrosis(HF)is a critical step in the progression of hepatocellular carcinoma(HCC).Gene associated with retinoid-IFN-induced mortality 19(GRIM19),an essential component of mitochondrial respiratory chain complex I,is frequently attenuated in various human cancers,including ***,we aimed to investigate the potential relationship and underlying mechanism between GRIM19 loss and HF ***:GRIM19 expression was evaluated in normal liver tissues,hepatitis,hepatic cirrhosis,and HCC using human liver disease spectrum tissue *** studied hepatocyte-specific GRIM19 knockout mice and clustered regularly interspaced short palindromic repeats(CRISPR)/CRISPR-associated protein-9(Cas9)lentivirus-mediated GRIM19 gene-editing in murine hepatocyte AML12 cells in vitro and in *** performed flow cytometry,immunofluorescence,immunohistochemistry,western blotting,and pharmacological intervention to uncover the potential mechanisms underlying GRIM19 loss-induced ***:Mitochondrial GRIM19 was progressively downregulated in chronic liver disease tissues,including hepatitis,cirrhosis,and HCC ***-specific GRIM19 heterozygous deletion induced spontaneous hepatitis and subsequent liver fibrogenesis in *** addition,GRIM19 loss caused chronic liver injury through reactive oxygen species(ROS)-mediated oxidative stress,resulting in aberrant NF-κB activation via an IKK/IKB partner in ***-more,GRIM19 loss activated NLRP3-mediated IL33 signaling administration of the NLRP3 inhibitor MCC950 dramatically via the ROS/NF-κB pathway in *** alleviated GRIM19 loss-driven HF in ***:The mitochondrial GRIM19 loss facilitates liver fibrosis through NLRP3/IL33 activation via ROS/NF-κB signaling,providing potential therapeutic approaches for earlier HF prevention.

关键词： Liver fibrosis GRIM19 Reactive Oxygen Species NF-κB NLRP3 inflammasome IL33.

A Recursive DRL-Based Resource Allocation Method for Multibeam Satellite Communication Systems

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 Electronics 2024年第5期33卷 1286-1295页

作者： Haowei MENG Ning xin Hao QIN Di zhao State Key Laboratory of Integrated Services Networks Xidian University China Academy of Space Technology Institute of Telecommunication Satellite

Optimization-based radio resource management(RRM) has shown significant performance gains on high-throughput satellites(HTSs). However, as the number of allocable on-board resources increases, traditional RRM is difficult to apply in real satellite systems due to its intense computational complexity. Deep reinforcement learning(DRL) is a promising solution for the resource allocation problem due to its model-free advantages. Nevertheless, the action space faced by DRL increases exponentially with the increase of communication scale, which leads to an excessive exploration cost of the algorithm. In this paper, we propose a recursive frequency resource allocation algorithm based on long-short term memory(LSTM) and proximal policy optimization(PPO), called PPO-RA-LOOP,where RA means resource allocation and LOOP means the algorithm outputs actions in a recursive manner. Specifically, the PPO algorithm uses LSTM network to recursively generate sub-actions about frequency resource allocation for each beam, which significantly cuts down the action space. In addition, the LSTM-based recursive architecture allows PPO to better allocate the next frequency resource by using the generated sub-actions information as a prior knowledge, which reduces the complexity of the neural network. The simulation results show that PPO-RA-LOOP achieved higher spectral efficiency and system satisfaction compared with other frequency allocation algorithms.

关键词： High-throughput satellites Proximal policy optimization Deep reinforcement learning Long-short term memory High-throughput satellites Proximal policy optimization Deep reinforcement learning Long-short term memory OPTIMIZATION POWER

Coping strategy of independent directors for job-fulfillment risk under different ownership types and enforced legal environments

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Journal of Accounting Research 2024年第4期17卷 112-142页

作者： Yu xin ying xin xinyi Huang Liping Xu School of Business Sun Yat-sen UniversityGuangzhouChina School of Accounting Guangdong University of Foreign StudiesGuangzhouChina

Ownership type,legal system evolution and their interaction significantly affect the incentives and behaviors of independent *** use the 2019 Securities Law revision as an exogenous shock to examine how state-owned enterprises(SOEs)versus non-SOEs and their independent directors respond to variations in regulatory compliance *** the revision,SOEs are more likely to purchase directors’and officers’liability insurance to provide job security for independent ***-SOEs are more likely to compensate for independent directors’fulfillment risk by increasing salaries and their independent directors are more likely to resign to avoid litigation *** coping strategies for SOEs,non-SOEs and independent directors are dynamic under different compliance risk stages and are affected by firm-level and director-level characteristics.

关键词： New Securities Law Ownership type Regulatory compliance risk Independent directors Job-fulfillment risk