检索结果-南通市图书馆

Influence Analysis for Celebrities via Public Cloud and Social Platform

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2016年第8期13卷 53-62页

作者： lu Liu Haoting Liang College of Movie and Media Sichuan Normal University School of Computer Science University of Science and Technology of China

Recently, the online social networks have emerged as one of the important platforms for social users. Among millions of users, famous person from entertainment circle arouse our interest. They promote social relationship and establish their reputation via these platforms. To analyze the social influence of entertainment stars we propose and implement a public cloud based framework to crawl celebrities' social messages from Sina Weibo, store the gathered messages and conduct various analysis to assess the socia influence. It consist of three key components: task generation, resource management and task scheduling, and influence analysis. The task generation is responsible of acquiring celebrities' socia accounts and issue crawling tasks. We propose a cross-media method to extract social accounts from webpages. The resource management and task scheduling will dynamic adjust the rented resource to minimize the total computing cost while keeping Qo S. We propose a dynamic instance provisioning strategy based on the large deviation principle. The influence analysis will undertake various types of analysis, such as fan count, posting frequency, textual analysis, and so on. More than 10,000 celebrities' microblogs have been gathered so far, and some related gainers, such as celebrities and ad agencies can gain the illumination brought by our analysis.

关键词： cloud computing social media analytics large deviation principle

在线全文

学校读者我要写书评

暂无评论

水平井工艺的市场开发和应用设想

油气田开发工程译丛 1993年第10期 5-10页

作者： Lema.,zr 李虎君

Accelerated exploration of TRIP metallic glass composite by laser additive manufacturing

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 Materials Science & Technology 2021年第19期78卷 68-73页

作者： Zejiang Yu Wei Zheng Zhiqiang Li Yunzhuo lu Xinbing Yun Zuoxiang Qin Xing lu School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028China Xi'an Space Engine Company Limited Xi'an710100China Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian116028China

Introducing transformation-induced plasticity(TRIP)effect into bulk metallic glass composites(BMGCs)is an effective route to improve their ductility and strain-hardening *** the morphology and structure of the crystalline austenite phases responsible for the TRIP phenomenon are strongly dependent on the alloy composition and cooling rate during freezing,distinguishing the optimal cases from a vast variety of candidates is the primary task of exploring TRIP ***,without a suitable theoretical guidance,the exploration of BMGCs is usually performed via the traditional trial-and-error route,making the BMGC development extremely time consuming and labor ***,we present a novel high-throughput strategy to accelerate the exploration process of TRIP *** efficiency of this strategy was demonstrated on a well-studied Cu-zr-Al alloy system.A screening library,comprised by121 cylindrical samples with different conditions,was rapidly prepared by laser additive manufacturing(LAM).The phases of the library were efficiently identified by micro-area X-ray diffraction(M-XRD)to screen the optimal compositions and cooling rates that precipitate only B2-Cu zr *** distribution uniformity of the B2-Cu zr phase was further evaluated based on digital image processing technology to screen the candidates of better *** high-throughput results are in good agreement with the previous casting investigations of discrete samples,confirming the validity of the present high-throughput strategy.

关键词： Bulk amorphous materials Composites High-throughput Laser deposition Metastable phases

Novel Crystallization Behaviors of zr-Based Metallic Glass Under Thermo-Mechanical Coupled Fatigue Loading Condition

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2019年第7期32卷 797-802页

作者： Zhi-Chao Ma Xiao-Xi Ma Hong-Wei Zhao Fu Zhang Li-Ming Zhou lu-Quan Ren School of Mechanical and Aerospace Engineering Jilin University Changchun 130025 China Key Laboratory of Bionic Engineering Ministry of Education Jilin University Changchun 130025. China

Novel crystallization behaviors of zr55Cu30Al10Ni5 bulk metallic glass are investigated. On the one hand, mixed oxides, including CuO, CuAlO2, CuA12O4 and zrO2, show sequential oxidation process determined by coupling effects of specific cyclic load and temperature. On the other hand, at a temperature (100℃) by far lower than Tg of 412 ℃, under cyclic loading condition, non-oxidized binary alloy Cuzr2 is precipitated;the thermo-mechanical coupled effects of temperature below Tg, and fatigue accumulation on the non-oxidized crystallization behaviors are revealed. Meanwhile, at a constant temperature of 400 ℃, by comparing among the XRD patterns, respectively, obtained from tensile, creep and fatigue fractures, the dominating effect of cyclic load on the generation of non-oxidized Cuzr2 is verified. Furthermore, the crystallization behavior of amorphous phases under cyclic loading condition is observed through TEM micrograph and diffraction pattern at 100℃.

关键词： Bulk metallic glass Fatigue Thermo-mechanical coupling Crystallization

Microstructure and corrosion behavior of zr–1.0Cr–0.4Fe–xMo alloys

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2015年第2期34卷 118-124页

作者： Tian-Guo Wei lu Zhang Zhi Miao Hong Liu Bai-Feng luan Wen Wang Chong-Sheng Long Reactor Fuel and Materials Key Laboratory Nuclear Power Institute of China Nuclear and Radiation Safety Ministry of Environmental Protection Institute of Material Science and Technology Chongqing University

Possibility of using Mo as an alloying element in zr-based alloys was attractive in terms of microstructure refinement and mechanical properties strengthening. In this research, zr–1.0Cr–0.4Fe–xMo（0, 0.2, 0.4, and 0.6） alloys with different Mo contents were prepared by vacuum arcmelting method, the microstructure and the corrosion resistance of these alloys were investigated. Addition of Mo has a refinement effect on the microstructure; with the increase of Mo content, the a-laths in the as-cast samples and the grain size in the annealed samples decrease. zr–1.0Cr–0.4Fe–xMo alloys have large numbers of fine second-phase particles（SPPs） in the matrix, the area fraction of the SPPs is more than 10 %. With the increase of Mo content, the population density of the SPPs increases significantly, while the average diameter of the SPPs decreases. Mo addition also affects the texture; the intensity of basal pole texture aligning normal direction decreases with the increase of Mo content in the *** with zr-4 and zr–1Nb, zr–1.0Cr–0.4Fe–xMo alloys have excellent corrosion resistance in 500 ℃/10.3 MPa steam. The corrosion rates of Mo-containing alloys are higher than that of Mo-free alloy, which is mainly attributed to the solute Mo atoms in the zr *** of the SPPs features due to the increase of Mo content alleviates the degradation of corrosion resistance in some degree, but it is not the dominant factor.

关键词： zr-based alloys Mo addition Microstructures Second-phase particles Corrosion behavior

Microstructure, wear resistance, and corrosion performance of Ti35zr28Nb alloy fabricated by powder metallurgy for orthopedic applications

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第6期41卷 191-198页

作者： Wei Xu Xin lu Jingjing Tian Chao Huang Miao Chen Yu Yan luning Wang Xuanhui Qu Cuie Wen Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Central Laboratory Peking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical SciencesBeijing100730China School of Engineering RMIT UniversityMelbourne3001Australia

A ternary Ti35zr28Nb alloy was fabricated by powder metallurgy(PM)from pre-alloyed *** microstructure,hardness,corrosion behavior,and wear response of the produced alloy were investigated *** results show that nearly full dense Ti35zr28Nb alloy(relative density is 98.1±1.2%)can be fabricated by *** microstructure was dominated with uniform *** Ti35zr28Nb alloy displayed spontaneous passivity in a naturally aerated simulated body fluid(SBF)solution at 37±0.5°*** Ti35zr28Nb alloy exhibited the highest corrosion resistance as compared to as-cast Ti6Al4V and pure Ti because of the formation of a protective passive film containing TiO2,Nb2O5,and zrO2,including the highest corrosion potential(-0.22±0.01 V),the lowest corrosion current density(57.45±1.88 nA),the lowest passive potential(0.05±0.01 V)and the widest passivation range(1.29±0.09 V).Under the same wear condition,the wear rate of the Ti35zr28Nb alloy(0.0021±0.0002 mm3/m·N)was lower than that of the CP Ti(0.0029±0.0004 mm3/m·N)and close to that of the Ti6Al4V(0.0020±0.0003 mm3/m·N).The wear mechanism of the Ti35zr28Nb alloy was mainly dominated by abrasive wear,accompanied by adhesive *** highest corrosion resistance together with the adequate wear resistance makes the PM-fabricated Ti35zr28Nb alloy an attractive candidate for orthopedic implant materials.

关键词： Ti35zr28Nb Powder metallurgy Microstructure Wear behavior Corrosion resistance

Defect elimination to enhance photoluminescence and optical transparency of Pr-doped ceramics for self-calibrated temperature feedback windows

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2023年第4期12卷 681-694页

作者： Kailei lu Yucheng Ye Wenhan Han Gang Cheng Xinghua Zhu Jianqi Qi Tiecheng lu College of Physics Sichuan UniversityChengdu 610064China Key Laboratory of High Energy Density Physics of Ministry of Education Sichuan UniversityChengdu 610064China Key Laboratory of Radiation Physics and Technology Ministry of EducationSichuan UniversityChengdu 610064China School of Chemistry and Chemical Engineering Sichuan University of Arts and ScienceDazhou 635000China School of Intelligent Manufacturing Sichuan University of Arts and ScienceDazhou 635000China

Pr-doped metal oxide polycrystalline transparent ceramics are highly desirable for photothermal window systems served in extreme environments;however,obtaining efficient photoluminescence(PL)together with high transparency in these ceramics is still posing serious challenges,which undoubtedly limits their ***,Pr-doped Y_(2)zr_(2)O_(7)(YZO)transparent ceramics,as an illustrative example,are prepared by a solid-state reaction and vacuum sintering *** to the elimination of defect clusters[Pr_(Y)^(4+)-O^(2-)Pr_(Y)^(4+)]and[Pr_(Y)^(4+)-e′]without the introduction of impurities and additional defects,the fabricated YZO:Pr ceramics exhibit high transparency(74%)and efficient PL(39-fold enhanced)after air annealing plus vacuum re-annealing ***,upon 295/450 nm excitation,the emission bands(blue,green,red,and dark red)from YZO:Pr ceramics present different temperature-dependent properties due to the thermalquenching channel generated by the intervalence charge transfer(IVCT)state between Pr_(Y)^(4+)and zr^(4+)***,a self-calibrated temperature feedback window with the same fluorescence intensity ratio(FIR)model(I_(613)/I_(503),where I represents the intensity)under different excitation light sources(295 and 450 nm)is *** developed photothermal window operated in a wide temperature range(303-663 K)shows relatively high sensitivities(absolute sensitivity(Sa)and relative sensitivity(S)reach 0.008 K^(-1)at 663 K and 0.47%K^(-1)at 363 K,respectively),high repeatability(>98%),and low temperature uncertainty(T<3.2 K).This work presents a paradigm for achieving enhanced PL along with elevated transparency of lanthanide(Ln)-doped ceramics through vacuum re-annealing treatment engineering and demonstrates their promising potential for photothermal window systems.

关键词： transparent ceramics temperature sensing Pr^(3+) luminescence enhancement vacuum annealing

Multifunctional hydrogels for chronic wounds repairing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biosurface and Biotribology 2023年第4期9卷 85-100页

作者： Xiao Wang Rong Hu lu Han Xiong lu School of Materials Science and Engineering Key Lab of Advanced Technologies of MaterialsMinistry of EducationSouthwest Jiaotong UniversityChengduChina Institute of Biomedical Engineering College of MedicineSouthwest Jiaotong UniversityChengduChina Key Laboratory of Marine Drugs Ministry of EducationSchool of Medicine and PharmaceuticsOcean University of ChinaQingdaoChina

Because of their tissue-like mechanical performances,high biocompatibility,and adjust-able functionality,hydrogels have become increasingly attractive materials for promoting wound *** wounds include burn,diabetic,and infected *** common incision wounds,chronic wounds are more challenging to *** meet the clinical needs,multifunctional hydrogels should be fabricated and *** guide future studies on the fabrication of hydrogel-based chronic wound dressings,a review of advanced multifunctional hydrogels is *** hydrogels with advanced properties,such as antibacterial,antioxidant,bioadhesive,anti-inflammatory,and wound healing properties,that can be used for skin burn wounds and diabetic wounds are ***,the prospects of advanced hydrogels for wound healing are elaborated.

关键词： adhesive property antibacterial biomaterials biomedical application functionalisation wound healing

Accelerated discovery of boron-dipyrromethene sensitizer for solar cells by integrating data mining and first principle

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 Materiomics 2021年第4期7卷 790-801页

作者： Tian lu Minjie Li Zhenpeng Yao Wencong lu Materials Genome Institute Shanghai UniversityShanghai200444China Department of Chemistry College of ScienceShanghai UniversityShanghai200444China Department of Chemistry University of TorontoTorontoOntarioM5S 3H6Canada

Boron-dipyrromethene(BODIPY)is one promising class of sensitizers for dye-sensitized solar cells(DSSCs)due to unique merits of high absorption coefficient and versatile structural modification ***,such derivatives usually suffer from limited power conversion efficiencies(PCEs)because of narrow light absorption band and low electron *** aid the discovery of BODIPY sensitizers,we employ an inverse design method to design efficient sensitizers by integrating data mining and firstprinciple *** establish robust data-mining models using genetic algorithm and multiple linear regression,where the features are filtered from 5515 descriptors and their meanings are explicitly explored for next inverse *** on the features’understanding,we design candidates NH1-6 and predict their PCEs,demonstrating remarkable enhancements(58%maximum)compared to previous ***,their optoelectronic properties including maximum absorption wavelengths,oscillator strengths,bandgaps,transferred charges,charge transferred distances,TiO_(2) conduction band shifts,short-circuit currents and electron injection efficiencies simulated via first-principle calculations indicate significant increasements(93 nm,122.41%,23.70%,36.36%,471.17%,63.64%,28.55%,107.86%maximum),which testifies the corresponding highly predicted PCEs and may overcome BODIPY dyes’*** as-designed BODIPY sensitizers can be promising candidates for DSSCs,and such method could help accelerate the discovery of other energy materials.

关键词： Boron-dipyrromethene sensitizers Quantitative structure-property relationships Optoelectronic properties Electron injection dynamics Dye-sensitized solar cells