检索结果-南通市图书馆

Chinese Journal of Polymer Science 2024年第8期42卷 1085-1092页

作者： Hong-yu Ji Hong-Liang Mu Chun-Feng Tang yu-xing zhang yue Chi Zhong-Bao Jian Key Laboratory of Advanced Structural Materials Ministry of EducationSchool of Materials Science and EngineeringChangchun University of TechnologyChangchun 130012China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Olefin polymerization is one of the most im portant chemical reactions in *** work presents a strategy that emphasizes the synergistic meta/poro-steric hindrance of N-aryl groups and electronic effects in newly synthesized neutral salicylaldiminato nickel *** nickel(Ⅱ)catalysts exhibit exceptional thermostability,ranging from 30℃to 130℃,demonstrating enhanced catalytic activities and broadly regulated polyethylene molecular weights(3-341 kg·mol^(-1))and controlled polymer branch density(2-102 brs/1000C).The preferred catalyst Ni3 with concerted steric and electronic effects enables the production of solid-state semi-crystalline polyethylene materials at temperatures below 90℃.Notably,Ni3 exhibits an impressive tolerance of 110℃and can withstand even the challenging polymerization temperature of 130℃,leading to the production of polyethylene wax and ***,functionalized polyethylene is produced.

关键词： Polyolefin Salicylaldiminato ligand Nickel catalyst Oil Wax

Black Hole Entropy with Modified Dispersion Relations

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2009年第8期52卷 261-263页

作者： WANG Fu-Jun GUI yuan-xing zhang yu School of Physics and Optoelectronic Technology Dalian University of Technology Dalian 116024 China

There is much interest in resolving the quantum corrections to Bekenstein-Hawking entropy with a large length scale limit. The leading correction term ＆ given by the logarithm of black hole area with a model-dependent coefficient. Recently the research for quantum gravity implies the emergence of a modification of the energy-momentum dispersion relation （MDR）, which plays an important role in the modified black hole thermodynamics. In this paper, we investigate the quantum corrections to Bekenstein-Hawking entropy in four-dimensional Sehwarzschild black hole and Reissner-Nordstrom black hole respectively based on MDR.

关键词： black hole entropy dispersion relation

Fracture strength of custom-fabricated Celay all-ceramic post and core restored endodontically treated teeth

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2006年第21期119卷 1815-1820页

作者： zhang yu-xing zhang Wei-hong LU Zhi-yue WANG Ke-li Department of Dentistry Beijing Hospital Beijing 100730 China

Background The increased use of all-ceramic crown provides a rationale for tooth-colored core. Due to superior mechanical properties, Vita Celay infiltration ceramic developed for crown and bridge works presents the potential for fabricating all-ceramic posts and cores in one piece. This study was conducted to compare the fracture strength of endodontically treated teeth which were thereafter given different types of posts and cores and crowns restoration, respectively. The evaluated post-and-core systems are： custom-fabricated Celay all-ceramic post-core, custom cast metal post-core, and prefabricated stainless steel post （Parapost） with and without 2.0 mm dentine ferrule. Methods Sixty freshly extracted human maxillary central incisors were endodontically treated and randomly divided into five groups with 12 samples each. Group A： Celay ceramic post-cores restored teeth with 2.0 mm dentine ferrule. Group B： Celay ceramic post-cores restored teeth with no dentine ferrule. Group C： cast metal post-cores restored teeth with 2.0 mm dentine ferrule. Group D： cast metal post-cores restored teeth with no dentine ferrule. Group E： prefabricated post and composite cores restored teeth with 2.0 mm dentine ferrule. All teeth were restored with Celay ceramic crowns. Each specimen was subjected to a load at a 45-degree angle to the long axis on MTS 810 material testing machine until failure, at crosshead speed of 0.02 cm/minute. Analysis of variance followed by the Newman-Keuls pairwise multiple comparison tests were used to compare the results of the groups tested. Results There was a statistically significant difference among the five groups （P〈0.01）. Celay ceramic post-cores restored teeth with 2.0 mm dentine ferrule [（758.35± 119.26） N] and cast metal post-cores restored teeth with 2.0 mm dentine ferrule [（756.63± 166.22） N] had a significantly greater mean fracture strength than the other three groups in which no significant difference was observed. The 2.0 mm dentine fer

关键词： fracture strength ceramics post and core nonvital tooth

Numerical simulation study on the hygrothermal performance of building exterior walls under dynamic wind-driven rain condition

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2024年第2期17卷 207-221页

作者： xing Hu Huibo zhang Hui yu School of Design Shanghai Jiao Tong UniversityShanghai200240China

Wind-driven rain(WDR)has a significant influence on the hygrothermal performance,durability,and energy consumption of building *** calculation of WDR loads using semi-empirical models has been incorporated into the boundary conditions of coupled heat and moisture transfer ***,prior research often relied on fixed WDR absorption ratio,which fail to accurately capture the water absorption characteristics of porous building materials under rainfall ***,this study aims to investigate the coupled heat and moisture transfer of exterior walls under dynamic WDR boundary conditions,utilizing an empirically obtained WDR absorption ratio model based on field *** developed coupled heat and moisture transfer model is validated against the HAMSTAD *** findings reveal that the total WDR flux calculated with the dynamic WDR boundary is lower than that obtained with the fixed WDR boundary,with greater disparities observed in orientations experiencing higher WDR *** variations in moisture flow significantly impact the surface temperature and relative humidity of the walls,influencing the calculation of cooling and heating loads by different *** to the transient heat transfer model,the coupled heat and moisture transfer model incorporating dynamic WDR boundary exhibits maximum increases of 17.6%and 16.2%in cooling and heating loads,*** dynamic WDR boundary conditions provide more precise numerical values for surface moisture flux,offering valuable insights for the thermal design of building enclosures and load calculations for HVAC systems.

关键词： wind-driven rain building component hygrothermal model transient simulation cooling and heating loads

Early embryonic failure caused by a novel mutation in the TUBB8 gene:A case report

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

World Journal of Clinical Cases 2024年第12期12卷 2092-2098页

作者： Xiao-yu zhang xing-xing zhang Lei Wang Department of Reproductive Center Zaozhuang Maternal and Child Healthcare HospitalZaozhuang 277000Shandong ProvinceChina

BACKGROUND This study aimed to explore the relationship between gene mutations and early embryonic development arrest and to provide more possibilities for the diagnosis and treatment of repeated implantation *** SUMMARY Here,we collected and described the clinical data of a patient with early embryonic development stagnation after repeated in vitro fertilization attempts for primary infertility at the Department Reproductive Center of Zaozhuang Maternal and Child Healthcare *** also detected the whole-exon gene of the patient's spouse and parents,and conducted bioinformatics analysis to determine the pathogenesis of the *** A novel mutant of the TUBB8 gene[c.602G>T(p.C201F)]was identified,and this mutant provided new data on the genotype-phenotype relationships of related diseases.

关键词： Genes Mutation Embryonic development Fertilization in vitro Intracytoplasmic sperm injection Case report

Flux-to-voltage characteristic simulation of superconducting nanowire interference device

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 Physics B 2020年第9期29卷 553-558页

作者： xing-yu zhang Yong-Liang Wang Chao-Lin Lv Li-xing You Hao Li Zhen Wang Xiao-Ming Xie State Key Laboratory of Functional Material for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences(CAS)Shanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China CAS Center for Excellence in Superconducting Electronics Shanghai 200050China

Inspired by recent discoveries of the quasi-Josephson effect in shunted nanowire devices,we propose a superconducting nanowire interference device in this study,which is a combination of parallel ultrathin superconducting nanowires and a shunt resistor.A simple model based on the switching effect of nanowires and fluxoid quantization effect is developed to describe the behavior of the *** current-voltage characteristic and flux-to-voltage conversion curves are simulated and discussed to verify the *** parameters of the shunt resistor and inductor are deduced for fabricating the devices.

关键词： superconducting nanowire switching effect flux-to-voltage conversion interference device

Adjustment mechanism of blasting dynamic-static action in the water decoupling charge

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2024年第6期34卷 821-836页

作者： Hao zhang Xueyang xing Yiteng Du Tingchun Li Jianxin yu Qingwen Zhu College of Civil Engineering and Architecture Shandong University of AeronauticsBinzhou 256600China Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and TechnologyQingdao 266590China School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454003China

Water decoupling charge blasting excels in rock breaking,relying on its uniform pressure transmission and low energy *** water decoupling coefficients can adjust the contributions of the stress wave and quasi-static ***,the quantitative relationship between the two contributions is unclear,and it is difficult to provide reasonable theoretical support for the design of water decoupling *** this study,a theoretical model of blasting fracturing partitioning is *** mechanical mechanism and determination method of the optimal decoupling coefficient are *** reliability is verified through model experiments and a field *** results show that with the increasing of decoupling coefficient,the rock breaking ability of blasting dynamic action decreases,while quasi-static action increases and then *** ability of quasi-static action to wedge into cracks changes due to the spatial adjustment of the blast hole and crushed *** quasi-static action plays a leading role in the fracturing range,determining an optimal decoupling *** optimal water decoupling coefficient is not a fixed value,which can be obtained by the proposed theoretical *** with the theoretical results,the maximum error in the model experiment results is 8.03%,and the error in the field test result is 3.04%.

关键词： Water decoupling blasting Blasting dynamic-static action Optimal decoupling coefficient Adjustment mechanism

Controllable nucleation and deformation of skyrmions on surface of magnetic nanotubular monolayer

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 3250-3259页

作者： Xin-Xin zhang Chen-yu zhang Yi-Xin xing Chao Man Jiao Liu Yong Hu Department of Physics College of SciencesNortheastern UniversityShenyang 110819China School of Materials and Mineral Resources Engineering Universiti Sains MalaysiaEngineering Campus14300 Nibong TebalPenangMalaysia State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China

Magnetic skyrmions emerge when the energy of ferromagnetic exchange interaction promoting parallel alignment of spins enters in competition with energies favoring non-collinear alignment of spins such as Dzy aloshinskii-Moriya interaction(DMI),long-rang dipole-dipole interaction(DDI),or higher-order exchange *** perform an unbiased Monte Carlo simulation to study the DMI-based skyrmion nucleation and stabilization on the surface of magnetic nanotubular monolayer controlled by tuning constants of DDI(g) and next-nearest-neighbor antiferromagnetic exchange interaction(j') with appropriate *** g and j',the loosely distributed skyrmions initially nucleate on the surface of nanotube approaching to the magnetic field(h) direction with increasing h in the intermediate ***,the skyrmion size,shape,density,distribution and crystal structure,as well as its driven field range,are tailored by g and j'.This work demonstrates the skyrmion nucleation mechanisms in three-dimensional magnetic nanostructures with curvature effect and multiple interactions,serving as a benchmark for a guide to experimentalists for preparation of samples in magnetic skyrmion states.

关键词： Magnetic nanotube Magnetic skyrmion Dzyaloshinskii-Moriya interaction Dipole-dipole interaction Monte Carlo simulation

Intrinsic lithiophilic carbon host derived from bacterial cellulose nanofiber for dendrite-free and long-life lithium metal anode

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第5期17卷 4203-4210页

作者： Gangyi Xiong Jiayu yu Yalan xing Puheng Yang Shichao zhang School of Materials Science and Engineering Beihang UniversityBeijing 100191China School of Physics Science and Nuclear Energy Engineering Beihang UniversityBeijing 100191China

Although lithium metal is considered a promising anode for advanced Li-S and Li-air batteries,the uncontrolled dendrite growth and infinite volume change impede its practical ***,we report an ideal framework composed of carbonized bacterial cellulose(CBC)nanofibers,which shows intrinsic lithiophilicity to molten lithium without any lithiophilic surface *** wetting behavior of molten lithium can be significantly improved because its surface functional groups provide thermodynamical driving force,and the high surface roughness derived from nanocracks leads to rapid infusion in *** hybrid anode exhibits long cycle life up to 2000 h and excellent deep stripping-platting capacity up to 20 mAh·cm^(-2).When the anode is assembled with LiFePO_(4) cathode,the full cell delivers a good cycling stability up to 700 *** is attributed to the intrinsic lithiophilic scaffold,which can not only lower the nucleation barrier of Li and provide uniform nucleation sites for stable Li stripping/plating,but also offer interspace to accommodate volume fluctuation of lithium during long *** work provides a new manner to achieve a series of intrinsic lithiophilic carbon skeletons based on the large family of biomass materials and organic materials.

关键词： intrinsic lithiophilicity lithium metal anode bacterial cellulose lithium dendrite long cycling life

Wavelength dependence of intrinsic detection efficiency of NbN superconducting nanowire single-photon detector

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 Physics B 2019年第7期28卷 534-537页

作者： Yong Wang Hao Li Li-xing You Chao-Lin Lv He-Qing Wang xing-yu zhang Wei-Jun zhang Hui Zhou Lu zhang Xiao-Yan Yang Zhen Wang State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT) Chinese Academy of Sciences Shanghai 200050 China University of Chinese Academy of Sciences Beijing 100049 China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050 China

Superconducting nanowire single-photon detectors(SNSPDs) have attracted considerable attention owing to their excellent detection performance;however, the underlying physics of the detection process is still *** this study, we investigate the wavelength dependence of the intrinsic detection efficiency(IDE) for NbN *** fabricate various NbN SNSPDs with linewidths ranging from 30 nm to 140 ***, for each detector, the IDE curves as a function of bias current for different incident photon wavelengths of 510–1700 nm are *** the IDE curves, the relations between photon energy and bias current at a certain IDE are *** results exhibit clear nonlinear energy–current relations for the NbN detectors, indicating that a detection model only considering quasiparticle diffusion is unsuitable for the meander-type NbN-based *** work provides additional experimental data on SNSPD detection mechanism and may serve as an interesting reference for further investigation.

关键词： niobium nitride superconducting nanowire single-photon detectors detection mechanism