检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

直角突变式钢吊车梁疲劳性能及加固方法研究

工程力学 2024年第S1期41卷 275-281页

作者：郑云孙嘉伟赵欣崔涛中冶建筑研究总院有限公司北京100088 建研院检测中心有限公司北京100013 河北工业大学土木与交通学院天津300401 清华大学土木系北京100084

钢吊车梁疲劳破坏问题造成了众多工业建筑的安全事故,也成为工业建筑领域长期的热点问题之一。直角突变式吊车梁是最常见的吊车梁形式,为研究直角突变式吊车梁的疲劳损伤机理和加固方法,改善传统式直角突变支座钢吊车梁的抗疲劳性能,在... 详细信息

钢吊车梁疲劳破坏问题造成了众多工业建筑的安全事故,也成为工业建筑领域长期的热点问题之一。直角突变式吊车梁是最常见的吊车梁形式,为研究直角突变式吊车梁的疲劳损伤机理和加固方法,改善传统式直角突变支座钢吊车梁的抗疲劳性能,在明晰吊车梁支座应力集中位置的基础上,提出三腹板构造的加固措施。采用有限元仿真分析与试验研究相结合的方法,探究了开孔设置方法和三腹板构造对带裂纹支座的加固效果;分析支座处加固前后应力集中部位沿焊缝长度方向的结构应力分布,验证了三腹板构造的工程实际加固效果。结果表明:相比于传统式直角支座,三腹板式支座各位置结构应力最大值下降了约60%,裂纹处应力强度因子下降了约50%;在无裂纹和带裂纹两种工况下,均大可大幅度提升吊车梁疲劳寿命。

关键词：工业建筑吊车梁疲劳性能疲劳寿命疲劳加固

Nano-effect enhanced cooperative luminescence of Yb^(3+) clusters in bulk materials

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第3期42卷 473-478,I0002页

作者： Daguang Li jiahao cui Yanhui Dong Hao cui Dan Zhao Weiping Qin State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun130012China

In order to improve the multi-ion cooperative transition, we proposed and exploited a novel nanoscale effect, namely the nanoshell effect in bulk materials. Based on the effect, an optimal material structure was designed by coating the surfaces of Ca F_(2):Yb^(3+)micron size particles with ZrO_(2). An about 2 times higher intensity of cooperative luminescence is observed upon laser excitation at 980 nm. Dynamical analysis exhibits that the novel effect plays a key role in improving the performance of cooperative transitions. Our results also suggest that the nanoshell effect in bulk materials is likely to be significant in some special cases, which have not been reported yet in the literature.

关键词： Yb^(3+)cluster ZrO_(2) Nanoshell Enhancement Cooperative luminescence Rare earths

A novel Ce_(0.485)Zr_(0.485)Y_(0.03)O_(2) composite oxide with surface doping of Y and its application in Pd-only three-way catalyst

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第2期43卷 749-757页

作者： Zheng Zhao Wei-xin Zhao Yong-Qi Zhang Mei-Sheng cui Yong-Ke Hou Dong-Ming Chen Juan-Yu Yang Zong-Yu Feng Xiao-Wei Huang National Engineering Research Center for Rare Earth Grirem Advanced Materials Co.Ltd.GRINM Group Corporation LimitedBeijing100088China Griem Hi-Tech Co.Ltd. Langfang065000China Rare Earth Functional Materials(Xiong’an)Innovation Venter Co.Ltd. Baoding071700China

The ceria-zirconia compound oxide-supported noble metal Pd(Pd@CZ)is widely used in three-way ***,the surface structure of CZ plays an important role in catalytic activity of ***,how to regulate the surface structure of CZ and clarify the structure–activity relationship is still a *** this paper,a strategy is proposed to develop high activity Pd@CZ nanocatalysts by tuning Y doping sites in *** precipitate-deposition method is developed to prepare the novel Ce_(0.485)Zr_(0.485)Y_(0.03)O_(2) composite with surface doping of Y(CZ-Y-S).In addition,the Pd@CZ-Y-S(Pd supported on CZ-Y-S)exhibits superior catalytic activity for HC,CO,and NO oxide,wherein,for CO and C_(3)H_(6) oxidation,the low-temperature activity of Pd@CZ-Y-S is still 20%higher than that of Pd@CZ-Y-B(Y bulk doping)and commercial Pd@CZ after 1000℃/4 h *** effect mechanism is further studied by density functional theory(DFT)*** with Pd@CZ-Y-B,Pd@CZ-Y-S shows the lower CO oxide reaction energy barriers due to the weaker adsorption strength of *** Y surface doping strategy could provide valuable insights for the development of highly efficient Pd@CZ catalyst with extensive applications.

关键词： Rare earth Ceria-zirconia-supported Pd Surface doping Experiment and theory Catalytic application

Residual inflammatory risk predicts long-term outcomes following stenting for symptomatic intracranial atherosclerotic stenosis

在线全文

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2024年第4期9卷 407-417页

作者： Ying Yu Yake Lou Yuesong Pan Long Yan Weilun Fu Zhikai Hou Rongrong cui Zhongrong Miao Yongjun Wang xin Lou Ning Ma Department of Interventional Neuroradiology Beijing Tiantan HospitalCapital Medical UniversityBeijingChina China National Clinical Research Center for Neurological Diseases Beijing Tiantan HospitalBeijingChina Department of Neurology Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Department of Cardiology The Second Affiliated Hospital of Chongqing Medical UniversityChongqingChina Department of Neurology Beijing Daxing District People's HospitalBeijingChina Radiology Chinese PLA General HospitalBeijingChina

Background and purpose Residual inflammatory risk(RIR)can predict the unfavourable outcomes in patients with minor ischaemic ***,the impact of preprocedural RIR on long-term outcomes in patients with symptomatic intracranial atherosclerotic stenosis(sICAS)who underwent stenting remains *** This retrospective,single-centre cohort study evaluated consecutive patients with severe sICAS who underwent intracranial *** were categorised into four groups based on preprocedural high-sensitivity C-reactive protein(hs-CRP)and low-density lipoprotein cholesterol(LDL-C):residual cholesterol inflammatory risk(RCIR,hs-CRP≥3 mg/L and LDL-C≥2.6 mmol/L),RIR(hs-CRP≥3 mg/L and LDL-C<2.6 mmol/L),residual cholesterol risk(RCR,hs-CRP<3 mg/L and LDL-C≥2.6 mmol/L)and no residual risk(NRR,hs-CRP<3 mg/L and LDL-C<2.6 mmol/L).The long-term clinical outcomes included recurrent ischaemic stroke and *** long-term imaging outcomes consisted of in-stent restenosis(ISR)and symptomatic ISR(sISR)after *** In this study,952 patients were included,with 751(78.9%)being ***-six cases were categorised into the RCIR group,211 into the RIR group,107 into the RCR group and 588 into the NRR *** with RCIR(adjusted HR 6.163;95%CI 2.603 to 14.589;p<0.001)and RIR(adjusted HR 2.205;95%CI 1.294 to 3.757;p=0.004)had higher risks of recurrent ischaemic stroke than those with NRR during the 54 months of median follow-up *** with RCIR(adjusted HR 3.604;95%CI 1.431 to 9.072;p=0.007)were more likely to occur ISR,and patients in the RIR group showed a significant increase in the risk of sISR(adjusted HR 2.402;95%CI 1.078 to 5.351;p=0.032)compared with those in the NRR group with a median follow-up time of 11.9 *** In patients with sICAS,preprocedural RIR may predict long-term recurrent ischaemic stroke,ISR and sISR following intracranial stenting.

关键词： intracranial stenosis symptomatic

Deciphering the linear relationship in the activity of the oxygen reduction reaction on Pt electrodes:A decisive role of adsorbates

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

Journal of Energy Chemistry 2024年第7期94卷 70-77页

作者： Haowen cui Yan-Xia Chen Hefei National Research Center for Physical Sciences at Microscale and Department of Chemical Physics University of Science and Technology of ChinaHefei 230026AnhuiChina

Despite substantial efforts in developing high-performance catalysts for the oxygen reduction reaction(ORR),the persistent challenge lies in the high onset overpotential of the ORR,and the effect of the elec-trolyte solution cannot be ***,we have systematically investigated the impact of adsorbate species and concentration,as well as solution pH,on the ORR activity on Pt(111)and Pt(poly)*** results all tend to establish a linear quantitative relationship between the onset potential for ORR and the adsorption equilibrium potential of the *** finding indicates the decisive role of adsorbates in the onset potential for ORR,suggesting that the adsorption potential of adsorbates can serve as an intuitive criterion for ORR *** support for this conclusion is derived from experimental results obtained from the oxygen evolution reaction on Pt(poly)with different adsorbate species and from the hydrogen evolution reaction on Pt(111)with iodine *** further propose both an empirical equation for the onset potential for ORR and the concept of a potential-regulated adsor-bate shielding effect to elucidate the influence of adsorbates on ORR *** study provides new insights into the high onset overpotential of the ORR and offers potential strategies for predicting and enhancingORRactivity inthefuture.

关键词： Oxygen reduction reaction Activity Adsorbate Equilibrium potential Pt(111)

Genetic analysis and candidate gene identification of salt tolerancerelated traits in maize

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第7期23卷 2196-2210页

作者： Hui Fang Xiuyi Fu Hanqiu Ge Mengxue jia Jie Ji Yizhou Zhao Zijian Qu Ziqian cui Aixia Zhang Yuandong Wang Ping Li Baohua Wang Scientific Observing and Experimental Station of Maize in Plain Area of Southern Region Ministry of Agriculture and Rural Affairs/School of Life SciencesNantong UniversityNantong 226019China Maize Research Institute Beijing Academy of Agriculture and Forestry Sciences(BAAFS)Beijing 100097China

Soil salinization poses a threat to maize production worldwide,but the genetic mechanism of salt tolerance in maize is not well ***,identifying the genetic components underlying salt tolerance in maize is of great *** the current study,a teosinte-maize BC2F7 population was used to investigate the genetic basis of 21 salt tolerance-related *** total,125 QTLs were detected using a high-density genetic bin map,with one to five QTLs explaining 6.05–32.02%of the phenotypic variation for each *** total phenotypic variation explained(PVE)by all detected QTLs ranged from 6.84 to 63.88%for each *** all 125 QTLs,only three were major QTLs distributed in two genomic regions on chromosome 6,which were involved in three salt tolerance-related *** addition,10 pairs of epistatic QTLs with additive effects were detected for eight traits,explaining 0.9 to 4.44%of the phenotypic ***,18 QTL hotspots affecting 3–7 traits were *** one hotspot(L5),a gene cluster consisting of four genes(ZmNSA1,SAG6,ZmCLCg,and ZmHKT1;2)was found,suggesting the involvement of multiple pleiotropic ***,two important candidate genes,Zm00001d002090 and Zm00001d002391,were found to be associated with salt tolerance-related traits by a combination of linkage and marker-trait association ***00001d002090 encodes a calcium-dependent lipid-binding(CaLB domain)family protein,which may function as a Ca^(2+)sensor for transmitting the salt stress signal downstream,while Zm00001d002391 encodes a ubiquitin-specific protease belonging to the C19-related *** findings provide valuable insights into the genetic basis of salt tolerance-related traits in maize and a theoretical foundation for breeders to develop enhanced salt-tolerant maize varieties.

关键词： maize salt tolerance-related traits QTL mapping region-based association analysis

Carbon nanotube integrated circuit technology:purification,assembly and integration

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3期6卷 120-138页

作者： jianlei cui Fengqi Wei Xuesong Mei State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China

As the manufacturing process of silicon-based integrated circuits(ICs)approaches its physical limit,the quantum effect of silicon-based field-effect transistors(FETs)has become increasingly *** the burgeoning carbon-based semiconductor technology has become one of the most disruptive technologies in the post-Moore *** one-dimensional nanomaterials,carbon nanotubes(CNTs)are far superior to silicon at the same technology nodes of FETs because of their excellent electrical transport and scaling properties,rendering them the most competitive material in the next-generation ICs ***,certain challenges impede the industrialization of CNTs,particularly in terms of material preparation,which significantly hinders the development of CNT-based *** on CNT-based ICs technology,this review summarizes its main technical status,development trends,existing challenges,and future development directions.

关键词： carbon nanotubes integrated circuits field-effect transistors post-Moore

Multipath Selection Algorithm Based on Dynamic Flow Prediction

在线全文

学校读者我要写书评

暂无评论

Journal of Computer and Communications 2024年第7期12卷 94-104页

作者： Jingwen Wang Guolong Yu xin cui School of Computer Science and Technology Shandong University of Technology Zibo China

Traditional traffic management techniques appear to be incompetent in complex data center networks, so proposes a load balancing strategy based on Long Short-Term Memory (LSTM) and quantum annealing by Software Defined Network (SDN) to dynamically predict the traffic and comprehensively consider the current and predicted load of the network in order to select the optimal forwarding path and balance the network load. Experiments have demonstrated that the algorithm achieves significant improvement in both system throughput and average packet loss rate for the purpose of improving network quality of service.

关键词： Data Center Network Software Defined Network Load Balance Long Short-Term Memory Quantum Annealing Algorithms

Modified constitutive models for Inconel 718 considering current density and temperature in electrically assisted forming process

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 Aeronautics 2024年第2期37卷 524-540页

作者： Xuan cui Rui ZHAO Min WAN School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China jiangxi Research Institute of Beihang University Jiangxi 330000China

Electrically Assisted Forming(EAF)technology has obvious advantages in material *** develop an effective constitutive model considering electrical effects,room temperature and electrically assisted quasi-static uniaxial tensile tests were conducted using ultrathin nickelbased superalloy plates with a thickness of 0.25 *** research focused on the two most widely recognized effects:the Joule thermal and the electric athermal *** mechanism of current action can be divided into two scenarios:one considering the Joule thermal effect only,and the other considering both effects *** basic constitutive models,namely the Modified-Hollomon model and the Johnson-Cook(J-C)model,were selected to be optimized through the classification of two different situations,and four optimized constitutive models were *** was found that the J-C model with simultaneous consideration of the Joule thermal effect and electric athermal effect had the best prediction effect by comparing the results of these four ***,the accuracy of the optimization model was verified by finite element simulation of the electrically assisted stretching optimization *** results show that the constitutive model can effectively predict the temperature effect caused by the Joule heat effect and the athermal effect of current on the material.

关键词： Joule heating Elastoplasticity Plastic deformation Superalloys Constitutive models