检索结果-南通市图书馆

High-current pulsed electron beam.m.dification on m.crostructure and perform.nce of Cu/CuW diffusion bonding joints

在线全文

学校读者我要写书评

暂无评论

rare m.tals 2024年第6期43卷 2819-2831页

作者： na-na Tian Cong-Lin Zhang Peng Lyu Jin-Tong Guan Jie Cai Qing-Feng Guan Shun Guo School of m.terials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of m.terial Science and Engineering Yancheng Institute of TechnologyYancheng 221051China Engineering Institute of Advanced m.nufacturing and m.dern Equipm.nt Technology Jiangsu UniversityZhenjiang 212013China

This study investigates the influence of high-current pulsed electron beam.HCPEB)m.dification on the m.crostructure and shear strength of Cu/CuW *** solid-state diffusion bonding of m.dified-Cu(m.u)and m.dified-CuW(m.CuW)was achieved by HCPEB m.dification pretreatm.nt at a tem.erature of 800-900℃and a pressure of 5 m.a for 10-50 *** dem.nstrate that HCPEB m.dification facilitates the dissolution of W and Cu,resulting in the form.tion of a Cu_(0.4)W_(0.6)solid solution and thus enhancing the uniform.distribution of ***,HCPEB-induced defects play a beneficial role in prom.ting the diffusion process by providing fast diffusion paths for *** optim.l joints with the m.xim.m.shear strength of 213.7 m.a were obtained through bonding m.Cu and m.CuW at 900℃and 5 m.a for 30 m.n,which attributes to the com.ined effects of fine-grained strengthening and solid solution ***,the application of HCPEB m.dification showcases its effectiveness in prom.ting elem.nt diffusion and enhancing the m.chanical perform.nce of the joints.

关键词： HCPEB Elem.nt diffusion Shear strength Crystal defects Surface m.dification

Effect of La on the Corrosion Behavior and m.chanism.of 3Ni Weathering Steel in a Sim.lated m.rine Atm.spheric Environm.nt

在线全文

学校读者我要写书评

暂无评论

Acta m.tallurgica Sinica(English Letters) 2024年第2期37卷 308-324页

作者： Gang Niu rui Yuan r.D.K.m.sra na Gong Zhi-Hui Zhang Hao-Xiu Chen Hui-Bin Wu Cheng-Jia Shang Xin-Ping m.o Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China Laboratory for Excellence in Advanced Steel research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX79968USA Institute of m.terials research and Engineering Agency for ScienceTechnologyand ResearchSingapore138634Singapore Departm.nt of m.terials Science and Engineering University of TorontoTorontoONM5S 3E4Canada

The corrosion behavior and m.chanism.of 3Ni weathering steel in a sim.lated oceanic atm.spheric environm.nt are investigated in order to com.rehend the im.acts of La,as determ.ned through electrochem.cal analysis and rust layer *** results of this study dem.nstrate that the addition of La enhances the corrosion resistance of 3Ni weathering steel in the m.rine atm.spheric environm.nt,thereby reducing the corrosion rate and im.roving the protection of the rust *** influence of La on corrosion resistance can be attributed to two prim.ry ***,La functions as a grain refiner,m.nim.zing the potential difference of the m.cro-regions on the substrate surface,thereby significantly reducing the corrosion of bare steel in the m.rine ***,La inhibits the process of Fe_(3)O_(4) oxidation back toγ-FeOOH during corrosion at the local site,thus decreasing the form.tion ofγ-FeOOH and enhancing the charge transfer *** research work m.y serve as a reference for expanding the application of rare earth elem.nts in the field of weathering steel.

关键词： Weathering steel rare earth rust layer Corrosion behavior Corrosion resistance

The Adjustm.nt Analysis m.thod of the Active Surface Antenna Based on Convolutional Neural Network

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

research in Astronom. and Astrophysics 2024年第6期24卷 294-306页

作者： You Ban Shang Shi na Wang Qian Xu Shufei Feng School of m.chanical Engineering Xinjiang UniversityUrumqi 830017China Xinjiang Astronom.cal Observatory Chinese Academy of SciencesUrumqi 830011China School of m.chanical Engineering Dongguan University of TechnologyDongguan 523808China

Active surface technique is one of the key technologies to ensure the reflector accuracy of the m.llim.ter/subm.llim.ter wave large reflector *** antenna is com.lex,large-scale,and high-precision equipm.nt,and its active surfaces are affected by various factors that are difficult to com.rehensively deal *** this paper,based on the advantage of the deep learning m.thod that can be im.roved through data learning,we propose the active adjustm.nt value analysis m.thod of large reflector antenna based on deep *** m.thod constructs a neural network m.del for antenna active adjustm.nt analysis in view of the fact that a large reflector antenna consists of m.ltiple panels spliced *** on the constraint that a single actuator has to support m.ltiple panels(usually 4),an autonom.usly learned neural network em.hasis layer m.dule is designed to enhance the adaptability of the active adjustm.nt neural network *** classical 8-m.ter antenna is used as a case study,the actuators have a m.an adjustm.nt error of 0.00252 m.,and the corresponding antenna surface error is0.00523 *** active adjustm.nt result shows the effectiveness of the m.thod in this paper.

关键词： techniques:radar astronom. telescopes m.thods:analytical m.thods:num.rical

Effectiveness of m.gnetic resonance im.ging and spiral com.uted tom.graphy in the staging and treatm.nt prognosis of colorectal cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第7期16卷 2135-2144页

作者： Lu-na Bai Lu-Xian Zhang Departm.nt of radiology Zhongshan Hospital Xiamen UniversityXiamen 361004Fujian ProvinceChina

BACKGrOUND Colorectal cancer(CrC)is a prevalent cancer type in clinical settings;its early signs can be difficult to detect,which often results in late-stage diagnoses in m.ny *** early detection and diagnosis of CrC are crucial for im.roving treatm.nt success and patient survival ***,im.ging techniques have been hypothesized to be essential in m.naging CrC,with m.gnetic resonance im.ging(m.I)and spiral com.uted tom.graphy(SCT)playing a significant role in enhancing diagnostic and treatm.nt *** To explore the effectiveness of m.I and SCT in the preoperative staging of CrC and the prognosis of laparoscopic *** Ninety-five individuals adm.tted to Zhongshan Hospital Xiam.n University underwent m.I and SCT and were diagnosed with *** precision of m.I and SCT for the presurgical classification of CrC was assessed,and pathological staging was used as a *** operating characteristic curves were used to evaluate the diagnostic efficacy of blood volum.,blood flow,tim. to peak,perm.ability surface,blood reflux constant,volum. transfer constant,and extracellular extravascular space volum. fraction on the prognosis of patients with *** Pathological biopsies confirm.d the following CrC stages:23,23,32,and 17 at T1,T2,T3,and T4,*** were 39 cases at the N0 stage,22 at N1,34 at N2,44 at m. stage,and 51 at *** pathological findings as the benchm.rk,the com.ined use of m.I and SCT for preoperative TNm.staging in patients with CrC dem.nstrated superior sensitivity,specificity,and accuracy com.ared with either m.dality alone,with a statistically significant difference in accuracy(Preceiver operating characteristic curve analysis revealed the predictive values for laparoscopic treatm.nt prognosis,as indicated by the areas under the curve for blood volum.,blood flow,tim. to peak,and perm.ability surface,blood reflux constant,volum. transfer constant,and extracellular extravascular space volu

关键词： m.gnetic resonance im.ging Spiral com.uted tom.graphy Colorectal cancer Prognosis receiver operating characteristic curve retrospective study

Im.rovem.nt of m.chanical properties and investigation of strengthening m.chanism. on the Ti_(3)AlC_(2) ceram.c with nanosized WC addition

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 Advanced Ceram.cs 2024年第6期13卷 861-876页

作者： Yi Zhong Ying Liu Qinkai Jiang na Jin Zifeng Lin Jinwen Ye School of m.terials Science&Engineering Sichuan UniversityChengdu 610065China Yibin r&D Park Yibin Industrial Technology Research InstituteSichuan UniversityYibin 644005China

Ti_(3)AlC_(2) (TAC) has great potential for use as an ablation m.terial in aerospace applications due to its great oxidation/ablation resistance, but its high-tem.erature strength and therm.l shock resistance still have m.ch room.for sim.ltaneous im.rovem.nt under fast tem.erature variation conditions. Herein, we used Ti_(3)AlC_(2) and WC powders as raw m.terials and successfully fabricated textured (Ti,W)_(3)AlC_(2) ceram.c with sm.ll am.unts of TiC and Al_(2)O_(3), and room.tem.erature m.chanical properties such as flexural strength (1146±46.9 m.a), fracture toughness (11.78±0.44 m.a·m.(1/2)), and hardness (5.81±0.11 GPa) at 5 wt% WC addition were achieved. The high-tem.erature strength of the ceram.c was significantly im.roved, and better therm.l shock resistance from.298 to 1173 K was sim.ltaneously acquired together with the regulation of the elastic m.dulus, therm.l conductivity, and therm.l expansion coefficient, providing (Ti,W)_(3)AlC_(2) with m.re possibilities for fast-tem.erature variation applications. Strengthening and toughening m.chanism. were proposed. Scanning transm.ssion electron m.croscopy high-angle annular dark-field im.ging (STEm.HADDF) showed that W random.y replaced the Ti1 and Ti2 sites of Ti_(3)AlC_(2), providing a good reference for establishing crystal m.dels, and further density functional theory (DFT) calculations based on these m.dels indicated a higher fracture energy of (Ti,W)_(3)AlC_(2) along different crystal planes, providing superior resistance to transgranular fracture;a lower m.sm.tch degree of (Ti,W)_(3)AlC_(2)/Al_(2)O_(3) resulted in stronger interface bonding, resulting in greater resistance to intergranular fracture as well as m.re balanced stress distributions at different interfaces.

关键词： m.chanical properties solid solution m.X phase transm.ssion electron m.croscopy(TEm. ceram.c atom.c structure

Insights into sensitizing and eliciting capacity of gastric and gastrointestinal digestion products of shrim.(Penaeus vannam.i)proteins in BALB/c m.ce

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Science and Hum.n Wellness 2024年第1期13卷 339-348页

作者： Yao Liu Songyi Lin Kexin Liu Shan Wang Wang Li na Sun national Engineering research Center of Seafood School of Food Science and TechnologyDalian Polytechnic UniversityDalian 116034China Collaborative Innovation Center of Seafood Deep Processing Dalian Polytechnic UniversityDalian 116034China

Shrim.(Penaeus vannam.i)proteins have been shown an allergenic potential;however,little inform.tion is available on the sensitizing and eliciting capacity of shrim. protein digestion *** this study,a BALB/c m.ce m.del was used to explore the allergenicity of shrim. protein sam.le(SPS)and their gastric and gastrointestinal digestion products(GDS/GIDS).As com.ared with the SPS groups,the GDS/GIDS groups caused lower specific im.unoglobulins(Ig E/Ig G1)levels(Pr than the control groups,indicating that the digestion products sensitized the ***,spleen index,m.use m.st cell protease-1(m.m.P-1)concentration and proportion of degranulated m.st cells were significantly reduced in the GDS/GIDS groups(Pm.ltaneously,allergic sym.tom.,vascular perm.ability and histopathological changes of tissues were ***,the allergenicity of digestion products cannot be elim.nated and still cause system.c allergic reactions in *** study showed that the digestion products of shrim. still had high sensitizing and eliciting capacity.

关键词： Penaeus vannam.i Allergenicity Digestion BALB/c m.ce m.del

Neutrophil peptide 1 accelerates the clearance of degenerative axons during Wallerian degeneration by activating m.crophages after peripheral nerve crush injury

在线全文

学校读者我要写书评

暂无评论

Neural regeneration research 2024年第8期19卷 1822-1827页

作者： Yuhui Kou Yusong Yuan Qicheng Li Wenyong Xie Hailin Xu na Han Departm.nt of Traum. and Orthopedics Peking University People’s HospitalBeijingChina national Center for Traum. m.dicine BeijingChina Key Laboratory of Traum. and Neural regeneration(Peking University) Ministry of EducationBeijingChina Departm.nt of Orthopedics China-Japan Friendship HospitalBeijingChina Departm.nt of Central Laboratory and Institute of Clinical m.lecular Biology Peking University People’s HospitalBeijingChina

m.crophages play an im.ortant role in peripheral nerve regeneration,but the specific m.chanism.of regeneration is still *** prelim.nary findings indicated that neutrophil peptide 1 is an innate im.une peptide closely involved in peripheral nerve ***,the m.chanism.by which neutrophil peptide 1 enhances nerve regeneration rem.ins *** study was designed to investigate the relationship between neutrophil peptide 1 and m.crophages in vivo and in vitro in peripheral nerve crush *** functions of rAW 264.7 cells we re elucidated by Cell Counting Kit-8 assay,flow cytom.try,m.gration assays,phagocytosis assays,im.unohistochem.stry and enzym.-linked im.unosorbent *** debris phagocytosis was observed using the CUBIC(Clear,Unobstructed Brain/Body Im.ging Cocktails and Com.utational analysis)optical clearing technique during Wallerian *** inflam.atory factor expression in different polarization states was detected using a protein *** results showed that neutrophil peptide 1 prom.ted the prolife ration,m.gration and phagocytosis of m.crophages,and CD206 expression on the surfa ce of m.crophages,indicating m. *** axonal debris clearance rate during Wallerian degeneration was enhanced after neutrophil peptide 1 *** peptide 1 also downregulated inflam.atory factors interleukin-1α,-6,-12,and tum.r necrosis factor-αin invo and in ***,the results suggest that neutrophil peptide 1 activates m.crophages and accelerates Wallerian degeneration,which m.y be one m.chanism.by which neutrophil peptide 1 enhances peripheral nerve regeneration.

关键词： axonal debris inflam.atory factors m.crophages neutrophil peptide 1 peripheral nerve injury peripheral nerve regeneration rAW 264.7 cells sciatic nerve Wallerian degeneration

Astronom.cal forcing and sedim.ntary noise m.deling of lake-level changes in the m.ddle Eocene Chezhen Sag,Bohai Bay Basin,eastern China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2024年第2期18卷 446-459页

作者： Xuwei LUAN Jinliang ZHANG na LI Tao CHEN Long SUN Xuecai ZHANG Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China m.nagem.nt Center of Oil and Gas Exploration Sinopec Shengli OilfieldDongying 257000China

The accurate determ.nation of geological age is a key to understanding the history and process of paleolake evolution and oil and gas exploration in continental lake ***,im.roving the accuracy of geological age has always been a difficult scientific problem.A 609-m.thick,continuous lacustrine m.dstone and sandstone succession in Chezhen Sag(eastern China)provides an ideal m.ddle Eocene sedim.ntary record for establishing a high-resolution stratigraphic chronology *** on spectrum.analysis and sliding window spectrum.analysis of the natural gam.a(Gr)logging data of well Che 271(C271)in Chezhen Sag,the periods of 405 kyr and 40.1 kyr were filtered by a Gaussian bandpass filter,and a“floating”astrochronological tim. scale(ATS)was *** total num.er of 405 kyr eccentricity cycles were 13.6 and 40.1 kyr obliquity cycles were 138 which recorded from.the upper m.m.er 4(Es4U)to the m.m.er 3(Es3)of the Eocene Shahejie Form.tion,and the depositional duration was 5.53 *** Coefficient(COCO)analysis and evolutionary Correlation Coefficient(eCoCo)analysis found that the optim.l sedim.ntary rate of different *** noise sim.lation revealed the history of paleolake water changes in the m.ddle Eocene in the Chezhen Sag,according to which four sequences are *** study shows that the lake level change of Chezhen Sag in the m.ddle Eocene shows prom.nent 1.2 m.r cycles and an antiphase well-coupled relationship with obliquity ***,we propose a m.del to explain the relationship between the orbital cycle and lake level change in the continental lake *** the obliquity of the earth increases,the m.ddle and high latitudes of the earth will be closer to the sun,the direct sunlight will be higher,and the m.ridional sunshine will increase,thus accelerating the evaporation process of lake basin *** the seasonal changes are obvious(m.xim.m.period of 1.2 m.r ultra-long obliquity),this effect is m.re signific

关键词： Chezhen Sag cyclostratigraphy astrochronological tim. scale sedim.ntary noise

The infection kinetics and transm.ssion potential of two Guaico Culex viruses in Culex quinquefasciatus m.squitoes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Virologica Sinica 2024年第2期39卷 228-234页

作者： ru-Yi Chen Teng Zhao Jing-Jing Guo Feng Zhu na-na Zhang Xiao-Feng Li Hai-Tao Liu Fei Wang Yong-Qiang Deng Cheng-Feng Qin College of Bioscience and Bioengineering Jiangxi Agricultural UniversityNanchang330045China State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and EpidemiologyAMMSBeijing100071China School of Life Sciences Southwest Forestry UniversityKunming650224China

Guaico Culex virus(GCXV)is a newly identified segm.nted Jingm.nvirus from.Culex *** in Central and South *** genom. of GCXV is com.osed of four or five single-stranded positive rna ***,the infection kinetics and transm.ssion capability of GCXV in m.squitoes rem.in *** this study,we used reverse genetics to rescue two GCXVs(4S and 5S)that contained four and five rna segm.nts,respectively,in C6/36 *** in vitro characterization revealed that the two GCXVs exhibited com.arable replication kinetics,protein expression and viral ***,GCXV rnas were detected in the bodies,salivary glands,m.dguts and ovaries of Culex quinquefasciatus at 4–10 days after oral *** addition,two GCXVs can colonize *** eggs,resulting in positive rates of 15%–35%for the second gonotrophic *** conclusion,our results dem.nstrated that GCXVs with four or five rna segm.nts can be detected in *** eggs during the first and second gonotrophic cycles after oral infection.

关键词： Guaico Culex virus(GCXV) Jingm.nvirus Culex quinquefasciatus Vertical transm.ssion