检索结果-南通市图书馆

Thermal properties of Y1-xMgxTaO4-x/2 ceramics via anion sublattice adjustment

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2020年第5期39卷 545-554页

作者： yun-Xuan Zhou Ying Zhou Peng Wu Peng Song xiao-yu chong Jing Feng Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Department of Materials Science and Engineering Pennsylvania State UniversityPA 16802USA

A systematic investigation concerned with Y1-xMgxTaO4-x/2(x=0,0.08,0.12,0.16 and 0.20,respectively)ceramics was fabricated by a solid-state reaction method and characterized by X-ray diffraction(XRD),Raman spectroscopy,scanning electron microscopy(SEM)and thermal *** spectra display that all of the samples are excellently consistent with the standard XRD spectrum of monoclinic YTaO4(PDF No.24-1415;space group:I2(5)).The Raman peaks of the samples doped with Mg2+just widen slightly compared with those of pure YTaO4,which are in agreement with the results of *** thermal conductivity of dense 7 wt%–8 wt%yttria-stabilized zirconia(7–8 YSZ)ceramic is about 2.5 W·m-1·K-1at 900°C,while the Y1-xMgxTaO4-x/2(x=0,0.08,0.12,0.16 and 0.20)ceramics possess lower thermal conductivity in the range of 1.45–1.57 W·m-1·K-1at 900°C,which declines by35%compared with that of 7–8 *** lower thermal conductivities of Y1-xMgxTaO4-x/2(x=0,0.08,0.12,0.16and 0.20)ceramics are originated from the enhanced phonon scattering caused by oxygen vacancy and Mg2+ions defect ***,the thermal expansion coefficients are about 9.0910-6–9.5910-6K-1along with the different amounts of Mg2+doping at 1200°*** to the pure sample,the thermal expansion coefficient decreases slightly when the Mg2+doping amount is over 20%.The systematic investigations on the phase,microstructure,elastic and thermal properties of Y1-xMgxTaO4-x/2(x=0,0.08,0.12,0.16 and 0.20)ceramics will provide guidance for its application at high temperature,especially as thermal barrier coatings.

关键词： Ceramics Yttrium tantalate Mg2+doping Thermal conductivity Thermal expansion

Changes of alloying elements on elasticity and solid solution strengthening ofα-Ti alloys:a comprehensive high-throughput first-principles calculations

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第8期41卷 2719-2731页

作者： Tao Liu xiao-yu chong Wei yu yun-Xuan Zhou Hai-Guang Huang Rong-Feng Zhou Jing Feng Faculty of Material Science and Engineering Kunming University of Science and TechnologyKunming650093China yunnan Titanium Industry Co.Ltd Chuxiong675000China City College Kunming University of Science and TechnologyKunming650051China

Herein,the effects of 33 alloying elements on the elastic properties and solid solution strengthening(SSS)of a-Ti alloys were systematically studied via first-principles calculations based on a dilute solid *** alloying elements in these calculations were thermodynamically favorable,which indicated that these elements could be dissolved inα-Ti ***_(35)Os had the highest elastic modulus as compared to those of other dilute Tibased solid ***,Co,and Pt were found to be promising candidates for improving the ductilities ofα-Ti solid solution *** solution strengthening was analyzed using Cottrell's and Labush's *** on the solid solubility,Ir,Rh,Ni,and Pt were found to possess the best solid solution hardening effects in the following order:Ir>Rh>Ni>*** bonding state between Ti and the impurity atom was visually characterized owing to the difference between their charge *** integrating the calculations of mean bond length and mean population,the results showed that Ti-Os had the largest mean population and degree of delocalization of the electron cloud around the solute atom,implying ionic characteristics of Os and ***,after analyzing the alloying elements of each group,we found thatⅧ-group elements(Ru,Rh,Pd,Os,Ir,Pt)had good potentials for improving the comprehensive mechanical properties of Ti alloys.

关键词： Thermodynamics First-principles calculations Mechanical properties Titanium alloys Electronic structure

Operando monitoring transition dynamics of responsive polymer using optofluidic microcavities

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2021年第7期10卷 1339-1346页

作者： Da-Quan Yang Jin-hui Chen Qi-Tao Cao Bing Duan Hao-Jing Chen xiao-chong yu yun-Feng xiao School of Information and Communication Engineering State Key Laboratory of Information Photonics and Optical CommunicationsBeijing University of Posts and TelecommunicationsBeijing 100876China Institute of Electromagnetics and Acoustics Xiamen UniversityXiamen 361005China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Department of Physics and Applied Optics Beijing Area Major Laboratory Beijing Normal UniversityBeijing 100875China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China

Optical microcavities have become an attractive platform for precision measurement with merits of ultrahigh sensitivity,miniature footprint and fast *** the achievements of ultrasensitive detection,optical microcavities still face significant challenges in the measurement of biochemical and physical processes with complex dynamics,especially when multiple effects are *** we demonstrate operando monitoring of the transition dynamics of a phase-change material via a self-referencing optofluidic *** use a pair of cavity modes to precisely decouple the refractive index and temperature information of the analyte during the phase-transition *** real-time measurements,we reveal the detailed hysteresis behaviors of refractive index during the irreversible phase transitions between hydrophilic and hydrophobic *** further extract the phase-transition threshold by analyzing the steady-state refractive index change at various power *** technology could be further extended to other materials and provide great opportunities for exploring on-demand dynamic biochemical processes.

关键词： transition refractive dynamics

Optically sizing single atmospheric particulates with a 10-nm resolution using a strong evanescent field

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2018年第1期7卷 1087-1093页

作者： xiao-chong yu Yanyan Zhi Shui-Jing Tang Bei-Bei Li Qihuang Gong Cheng-Wei Qiu yun-Feng xiao State Key Laboratory for Mesoscopic Physics and School of Physics Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore NUS Suzhou Research Institute(NUSRI) Suzhou 215123China SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology Shenzhen UniversityShenzhen 518060China

Although an accurate evaluation of the distribution of ultrafine particulate matter in air is of utmost significance to public health,the usually used PM2.5 index fails to provide size distribution *** we demonstrate a low-profile and cavity-free size spectrometer for probing fine and ultrafine particulate matter by using the enhanced particle-perturbed scattering in strong optical evanescent fields of a nanofiber *** unprecedented size resolution reaches 10 nm for detecting single 100-nm-diameter nanoparticles by employing uniform nanofibers and controlling the polarizations of the probe *** size spectrometry was tested and used to retrieve the size distribution of particulate matter in the air of Beijing,yielding mass concentrations of nanoparticles,as a secondary exercise,consistent with the officially released *** nanofiber-array probe shows potential for the full monitoring of air pollution and for studying early-stage haze evolution and can be further extended to explore nanoparticle interactions.

关键词： air pollution optical nanofiber single particulates size spectrometer

Elaborating strengthen mechanism of Pt-Ir solid solution superalloy at finite temperature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第3期43卷 1243-1256页

作者： Wei yu xiao-yu chong yun-Xuan Zhou Meng-Di Gan Ying-Xue Liang Yan Wei Ai-Min Zhang Chang-Yi Hu Xing-yu Gao Li Chen Hai-Feng Song Jing Feng Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China yunnan Precious Metals Laboratory Co.LTD Kunming650106China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing100088China

Pt-Ir alloy is potential superalloys used above 1300℃because of their high strength and creep ***,the ductility of Pt-Ir alloy has rapidly deteriorated with the increase of Ir,resulting in poor *** work quantitatively evaluated the solid solution strengthening(SSS)and grain refinement strengthening(GRS)of Pt-Ir alloy using first-principles calculations combined with experimental ***,the stretching force constants in the second nearest neighbor region(SFC^(2nd))of pure Ir(193.7 eV·nm^(-2))are 3.40 times that of pure Pt(57.0 eV·nm^(-2)),i.e.,the interatomic interaction is greatly enhanced with the increase of Ir content,which leads to the decrease of ductility,and modulus misfit plays a dominant role in ***,the physical mechanisms responsible for the hardness(H_(V))of Pt-Ir alloy,using the power-law-scaled function of electron work function coupled SSS and GRS,are attributed to the electron redistribution caused by different Ir ***,a thorough assessment of the thermodynamic characteristics of Pt-Ir binary alloy was conducted,culminating in development of a mapping model that effectively relates enmposition,temperature and *** results revealed that the compressive strength incrcases with the Ir content,and the highest strength was observed in Pt_(0.25)Ir_(0.75).This study provides valuable insights into the Pt-Ir alloy system.

关键词： Elastic properties Phonon Solid solution strengthen Force constants CALPHAD

Real-time monitoring of hydrogel phase transition in an ultrahigh Q microbubble resonator

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2020年第4期8卷 497-502页

作者： DAQUAN YANG AIQIANG WANG JIN-HUI CHEN xiao-chong yu CHUWEN LAN yuEFENG JI yuN-FENG xiao State Key Laboratory of Information Photonics and Optical Communications School of Information and Communication EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Frontiers Science Center for Nano-optoelectronics&Collaborative Innovation Center of Quantum Matter Beijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Beijing Academy of Quantum Information Sciences Beijing 100193China

The ability to sense dynamic biochemical reactions and material processes is particularly crucial for a wide range of applications,such as early-stage disease diagnosis and biomedicine *** microcavities-based label-free biosensors are renowned for ultrahigh sensitivities,and the detection limit has reached a single nanoparticle/molecule *** particular,a microbubble resonator combined with an ultrahigh quality factor(Q)and inherent microfluidic channel is an intriguing platform for optical biosensing in an aqueous *** this work,an ultrahigh Q microbubble resonator-based sensor is used to characterize dynamic phase transition of a thermosensitive ***,by monitoring resonance wavelength shift and linewidth broadening,we(for the first time to our knowledge)reveal that the refractive index is increased and light scattering is enhanced simultaneously during the hydrogel hydrophobic transition *** platform demonstrated here paves the way to microfluidical biochemical dynamic detection and can be further adapted to investigating single-molecule kinetics.

关键词： Real-time monitoring hydrogel phase transition an ultrahigh Q microbubble resonator

室温硫化硅橡胶防污闪涂料有机固含量的测试方法研究

在线全文

学校读者我要写书评

暂无评论

绝缘材料 2017年第2期50卷 81-86页

作者：肖雨张翀李飞陈新全球能源互联网研究院先进输电技术国家重点实验室北京102211

为检测室温硫化硅橡胶防污闪涂料(RTV硅橡胶涂料)的基胶含量,即有机固含量,采用热失重分析、热传导分析、Fourier变换红外光谱分析、密度分析等方法,对实验室制备的RTV硅橡胶涂料样品进行检测,同时选取厂家实际产品进行验证。结果表明:... 详细信息

为检测室温硫化硅橡胶防污闪涂料(RTV硅橡胶涂料)的基胶含量,即有机固含量,采用热失重分析、热传导分析、Fourier变换红外光谱分析、密度分析等方法,对实验室制备的RTV硅橡胶涂料样品进行检测,同时选取厂家实际产品进行验证。结果表明:上述方法可以有效地检测RTV硅橡胶涂料中基胶和填料的含量比例,其中密度的测量简便易行,可以作为现场抽检的项目,为绝缘子用常温硫化硅橡胶防污闪涂料的入网前检测提供参考。

关键词：防污闪涂料室温硫化硅橡胶有机固含量测试方法

Multiparameter magnetic resonance imaging-based radiomics model for the prediction of rectal cancer metachronous liver metastasis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2025年第1期17卷 62-72页

作者： Zhi-Da Long xiao yu Zhi-Xiang Xing Rui Wang Department of Hepatobiliary and Pancreaticosplenic Surgery Jingzhou Hospital Affiliated to Yangtze UniversityJingzhou 434100Hubei ProvinceChina

BACKGROUND The liver,as the main target organ for hematogenous metastasis of colorectal cancer,early and accurate prediction of liver metastasis is crucial for the diagnosis and treatment of ***,this study aims to investigate the application value of a combined machine learning(ML)based model based on the multiparameter magnetic resonance imaging for prediction of rectal metachronous liver metastasis(MLM).AIM To investigate the efficacy of radiomics based on multiparametric magnetic resonance imaging images of preoperative first diagnosed rectal cancer in predicting MLM from rectal *** We retrospectively analyzed 301 patients with rectal cancer confirmed by surgical pathology at Jingzhou Central Hospital from January 2017 to December *** participants were randomly assigned to the training or validation queue in a 7:3 *** first apply generalized linear regression model(GLRM)and random forest model(RFM)algorithm to construct an MLM prediction model in the training queue,and evaluate the discriminative power of the MLM prediction model using area under curve(AUC)and decision curve analysis(DCA).Then,the robustness and generalizability of the MLM prediction model were evaluated based on the internal validation set between the validation queue *** Among the 301 patients included in the study,16.28%were ultimately diagnosed with MLM through pathological *** analysis showed that carcinoembryonic antigen,and magnetic resonance imaging radiomics were independent predictors of ***,the GLRM prediction model was developed with a comprehensive nomogram to achieve satisfactory *** prediction performance of GLRM in the training and validation queue was 0.765[95%confidence interval(CI):0.710-0.820]and 0.767(95%CI:0.712-0.822),*** with GLRM,RFM achieved superior performance with AUC of 0.919(95%CI:0.868-0.970)and 0.901(95%CI:0.850-0.952)in the training and validation queue,respect

关键词： Rectal cancer Metachronous liver metastases Magnetic resonance imaging Radiomics Machine learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

合金元素对Pt基合金热弹性性能的影响

Transactions of Nonferrous Metals Society of China 2023年第6期33卷 1851-1861页

作者：余威种晓宇干梦迪魏燕张爱敏胡昌义冯晶昆明理工大学材料科学与工程学院昆明650093 昆明贵研新材料科技有限公司昆明650106

采用基于第一性原理计算的准静态近似方法,研究33种合金元素对Pt基合金热弹性性能的影响。研究表明:当稀土元素(Y、La、Ce或Th)固溶进入Pt基体后,由于稀土元素和Pt之间的平均键长较长,Pt基合金Pt_(31)X的弹性常数和弹性模量变小;与纯Pt... 详细信息

采用基于第一性原理计算的准静态近似方法,研究33种合金元素对Pt基合金热弹性性能的影响。研究表明:当稀土元素(Y、La、Ce或Th)固溶进入Pt基体后,由于稀土元素和Pt之间的平均键长较长,Pt基合金Pt_(31)X的弹性常数和弹性模量变小;与纯Pt相比,合金元素Ta、Nb、V、W或Mo固溶进入Pt基体后会产生强烈的电子局域化并使平均键长缩短,从而提高Pt基合金的杨氏模量;同时,由于Pt_(31)X(X=Ta,Nb,V,W和Mo)的平均键长随温度的升高缓慢增加,因此,其模量温度系数较小,其中,Pt_(31)W的模量温度系数最小(-15.82×10^(-5)K^(-1))。因此,W、Ta、Mo、Nb或V是潜在的具有增强Pt弹性稳定性的合金元素。

关键词：第一性原理计算热学性质弹性性质准静态近似 Pt基合金