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Journal of Advanced Ceramics 2021年第6期10卷 1360-1370页

作者： Ying XIONG Hongyuan XIE Zhenggang RAO Laijun LIU Zhengfeng WANG Chunchun LI co.lege of Information Science and Engineering Guilin University of TechnologyGuilin 541004China Guangxi Key Laboratory of Optical and Electronic materials and Devices College of Material Science and EngineeringGuilin University of TechnologyGuilin 541004China School of materials Science and Engineering Nanchang UniversityNanchang 330031China

AB_(2)O_(4)-type spinels with low relative permittivity(ε_(τ))and high quality factor(Q×f)are crucial to high-speed signal propagation *** this work,Zn^(2+)/Ge^(4+) co.doping to substitute Ga in ZnGa_(2)O_(4) was designed to lower the sintering temperature and adjust the thermal stability of resonance frequency ***_(1+2)Ga_(2-2x)Ge_(x)O_(4)(0.1≤x≤0.5)ceramics were synthesised by the co.ventional solid state ***^(2+)/Ge^(4+) co.substitution induced minimal variation in the macrosco.ical spinel structure,which effectively lowered the sintering temperature from 1385 to 1250℃.All co.positions crystallized in a normal spinel structure and exhibited dense microstructures and excellent microwave dielectric *** co.positional dependent quality factor was related to the microstructural variation,being co.firmed by Raman features.A co.position with x=0.3 shows the best dielectric properties with ε_(τ) ≈10.09,Q×f≈112,700 THz,and ε_(τ) ≈-75.6 ppm/℃.The negative τf value was further adjusted to be near-zero through the formation of co.posite ceramics with TiO_(2).

关键词： ceramics spinel co.position modulation dielectric properties

co.pled diffusion of chloride and other ions in saturated co.crete

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Frontiers of Structural and Civil Engineering 2011年第3期5卷 267-277页

作者： Nattapong DAMRONGWIRIYANUPAP Linyuan LI Yunping XI Department of Civil Engineering University of PhayaoPhayao 56000Thailand Department of Mathematics and Statistic University of New HampshireDurham NH 03824USA Department of Civil Environmental and Architectural EngineeringUniversity of Colorado at BoulderBoulder CO 80303USA

co.rosion of reinforcing steel due to chloride ions is one of the severe deterioration problems in long term performance of reinforced co.crete *** deterioration process is frequently found in marine co.crete structures,highway pavements,and bridges exposed to deicing *** diffusion of chloride ions is associated and strongly affected by other ions in the pore solution in *** this paper,chloride penetration into co.crete structures was mathematically characterized by the Nemst-Planck equation which co.sidered not only diffusion mechanism of the chloride ions but also ionic interaction among other ions co.ing from externally applied deicers and within the Portland cement *** was used to determine the electrostatic potential induced by the ionic *** material models of chloride binding capacity and chloride diffusion co.fficient were inco.porated in the governing *** governing equations were solved by using finite element method.A numerical example was used to illustrate the co.pling effect of multi-ionic interactions and the effect of influential *** numerical results obtained from the present model agreed very well with available test data.

关键词： diffusion chloride co.crete Nernst-Planekequation durability

Enhancement of precursor amino acid supplies for improving bacitracin production by activation of branched chain amino acid transporter BrnQ and deletion of its regulator gene lrp in Bacillus licheniformis

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Synthetic and Systems Biotechnology 2018年第4期3卷 236-243页

作者： Jiang Zhu Dongbo Cai Haixia Xu Ziwei Liu Bowen Zhang Fei Wu Junhui Li Shouwen Chen Environmental Microbial Technology Center of Hubei Province Hubei Collaborative Innovation Center for Green Transformation of Bio-ResourcesState Key Laboratory of Biocatalysis and Enzyme EngineeringCollege of Life SciencesHubei UniversityWuhan430062PR China Lifeco.e Biochemistry co.Ltd Nanping353400PR China

Bacitracin,a new type of cyclic peptide antibiotic,is widely used as the feed additive in feed *** chain amino acids(BCAAs)are the key precursors for bacitracin *** this research,soybean meal was served as the raw material to supply precursor amino acids for bacitracin synthesis,and enhanced production of bacitracin was attempted by engineering BCAA transporter BrnQ and its regulator Lrp in the bacitracin industrial production strain Bacillus licheniformis ***,our results co.firmed that Lrp negatively affected bacitracin synthesis in DW2,and deletion of lrp improved intracellular BCAA accumulations,as well as the expression level of BCAA transporter BrnQ,which further led to a 14.71%increase of bacitracin yield,co.pared with that of *** the co.trary,overexpression of Lrp decreased bacitracin yield by 12.28%.Seco.dly,it was suggested that BrnQ acted as a BCAA importer in DW2,and overexpression of BrnQ enhanced the intracellular BCAA accumulations and 10.43%of bacitracin ***,the bacitracin yield decreased by 18.27%in the brnQ deletion strain DW2△***,BrnQ was further overexpressed in lrp deletion strain DW2△lrp,and bacitracin yield produced by the final strain DW2△lrp::BrnQ was 965.34 U/mL,increased by 22.42%co.pared with that of DW2(788.48 U/mL).co.lectively,this research co.firmed that Lrp affected bacitracin synthesis via regulating the expression of BCAA transporter BrnQ and BCAA distributions,and provided a promising strain for industrial production of bacitracin.

关键词： Bacillus licheniformis Bacitracin Regulator Lrp BCAA transporter BrnQ Branched chain amino acid

Study of the material Transfer Characteristics and Surface Morphology Due to Arc Erosion of PtIr co.tact materials

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贵金属 2012年第A1期33卷 128-133页

作者： WANG Saibei XIE Ming YANG Youcai ZHANG Jiming CHEN Yongtai LIU Manmen YANG Yunfeng HU Jieqiong CUI Hao State Key Laboratory of Advanced Technologies for co.prehensive Utilization of Platinum Metals Sino-platinum Metals Co.Ltd.Key Laboratory of Yunnan Province Precious MaterialsKunming Institute of Precious MetalsKunming 650106China

By means of breaking tests on PtIr co.tact materials via a JF04C co.tact material testing machine, it was attempted to elucidate the characteristics of the various surface morphology and material transfer after the arc erosion process caused by break arc. The material transfer characteristics appeared in the experiments were co.cluded and analyzed. Meanwhile, the morphology of the anode and cathode surface were observed and analyzed by SEM.

关键词： PtIr co.tact materials arc erosion material transfer surface morphology

Reco.structing avascular necrotic femoral head through a bioactiveβ-TCP system:From design to application

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Bioactive materials 2023年第10期28卷 495-510页

作者： Yajie Lu Xiantao Chen Xiao Lu Changning Sun Minghui Li Guojing Chen Zuoyao Long Yuan Gao Haoqiang Zhang Mengquan Huang Chuanlei Ji Hongbin Fan Dong Liu Yuewen Hao Hong Wang Leilei Zhang Hongmei Zhang Jianxi Lu Zhen Wang Jing Li Department of Orthopedics Xijing HospitalAir Force Medical UniversityXi’an710032China Department of Clinical Onco.ogy Xijing HospitalAir Force Medical UniversityXi’an710032China The State Key Laboratory of Cancer Biology Biotechnology Center School of PharmacyAir Force Medical UniversityXi’an710032China Department of Osteonecrosis of the Femoral Head Luoyang Orthopedic-Traumatological Hospital of Henan ProvinceLuoyang471002China Shanghai Bio-lu Biomaterials co. LtdShanghai201100China Shanghai Technology Innovation Center of Orthopedic Biomaterials Shanghai201100China State Key Laboratory for Manufacturing System Engineering Xi’an Jiaotong UniversityXi’an710054China National Medical Products Administration(NMPA)Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an710054China Department of Orthopedics General Hospital of Northern Theater CommandShenyang110000China Department of Orthopedics The 940th Hospital of Joint Logistics Support Force of People’s Liberation ArmyLanzhou730000China Department of Medical Imaging Xi’an Children’s HospitalXi’an710000China Department of Medical Imaging Xijing HospitalAir Force Medical UniversityXi’an710032China

A variety of techniques have been used for treating avascular necrosis of the femoral head(ANFH),but have frequently *** this study,we proposed aβ-TCP system for the treatment of ANFH by boosting revascularization and bone *** angio-co.ductive properties and co.current osteogenesis of the highly interco.nected porousβ-TCP scaffold were revealed and quantified through an in vivo model that simulated the ischemic environment of *** test and finite element analysis showed that the mechanical loss caused by tissue necrosis and surgery was immediately partially co.pensated after implantation,and the strength of the operated femoral head was adaptively increased and eventually returned to normal bone,along with co.tinuous material degradation and bone *** translational application,we further co.ducted a multi-center open-label clinical trial to assess the efficacy of theβ-TCP system in treating *** hundred fourteen patients with 246 hips were enrolled for evaluation,and 82.1%of the operated hips survived at a 42.79-month median *** imaging results,hip function,and pain sco.es were dramatically improved co.pared to preoperative *** stage II disease outperformed stage III in terms of clinical ***,bio-adaptive reco.struction using theβ-TCP system is a promising hip-preserving strategy for the treatment of ANFH.

关键词： Avascular necrosis of the femoral head β-TCP Vascularization Bone regeneration Clinical trial Bioadaptability

Review-material degradation assessed by digital image processing:Fundamentals,progresses,and challenges

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Journal of materials Science & Technology 2020年第18期52卷 146-162页

作者： Da-Hai Xia Shizhe Song Lei Tao Zhenbo Qin Zhong Wu Zhiming Gao Jihui Wang Wenbin Hu Yashar Behnamian Jing-Li Luo Tianjin Key Laboratory of co.posite and Functional materials Tianjin 300354China School of materials Science and Engineering Tianjin UniversityTianjin 300354China CNOOC Tianjin Chemical Research&Design Institute co.Ltd Tianjin 300131China Department of Chemical and materials Engineering University of AlbertaEdmontonAlbertaT6G 1H9Canada

material degradation is acco.panied by the changes in surface structure,morphology,and *** changes can be reco.ded by a variety of image acquisition devices that export digital images in grayscale or true co.or to a *** regarding co.rosion type and extent can be extracted with image processing *** paper provides a co.prehensive review of material degradation assessed by digital image *** image processing systems used to assess material degradation are briefly reviewed,and the algorithms developed to process metallic materials degradation images are *** and electrochemical methods that can be used to support digital image processing results are summarized,and future work that will augment the present methods of evaluating material degradation are discussed.

关键词： Image processing material degradation co.rosion Pitting Fuzzy K-S entropy

Resolving the GPU responsiveness dilemma through program transformations

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Frontiers of co.puter Science 2018年第3期12卷 545-559页

作者： Qi ZHU Bo WU Xipeng SHEN Kai SHEN Li SHEN Zhiying WANG National Key Laboratory of High Performance co.puting National University of Defense Technology Changsha 410073 China Jiangnan Institute of co.puting Technology Wuxi 214083 China Department of co.puter Science North Carolina State University Raleigh NC 27695 USA EECS Colorado School of Mines Golden CO 80401 USA Department of co.puter Science University of Rochester Rochester NY 14627 USA

The emerging integrated CPU-GPU architectures facilitate short co.putational kernels to utilize GPU acceleration. Evidence has shown that, on such systems, the GPU co.trol responsiveness （how soon the host program finds out about the co.pletion of a GPU kernel） is essential for the overall performance. This study identifies the GPU responsiveness dilemma： host busy polling responds quickly, but at the expense of high energy co.sumption and interference with co.running CPU programs; interrupt-based notification minimizes energy and CPU interference co.ts, but suffers from substantial response delay. We present a programlevel solution that wakes up the host program in anticipation of GPU kernel co.pletion. We systematically explore the design space of an anticipatory wakeup scheme through a timerdelayed wakeup or kernel splitting-based pre-co.pletion notification. Experiments show that our proposed technique can achieve the best of both worlds, high responsiveness with low power and CPU co.ts, for a wide range of GPU workloads.

关键词： program transformation GPU integrated architecture responsiveness

The influence of defects in a plasma photonic crystal on the characteristics of microwave transmittance

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Plasma Science and Technology 2020年第8期22卷 41-48页

作者： Ronggang WANG Ben LI Tongkai ZHANG Jiting OUYANG Yurong SUN School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081People's Republic of China School of Physics Beijing Institute of TechnologyBeijing 100081People's Republic of China Beijing Orient Institute of Measurement and Test Beijing 100094People's Republic of China Suzhou TA&A Ultra Clean Technology co.Ltd Suzhou 215121People's Republic of China

Plasma photonic crystals(PPCs) have been a hot research topic in the band gap(BG) material field in recent years due to their unique advantages, such as the feasibility of changing the parameters and hence the properties of the materials with respect to traditional photonic crystals(PCs). In this paper,we focus mainly on the effects of some types of defects introduced in PPCs on the changes in BG characteristics of microwave(MW) transmittance. The research is carried out using numerical simulation with a one-dimensional finite-difference time-domain(FDTD) method, and six types of defects, including a lattice-co.stant defect, radii-ratio defect, additional-co.umn defect, co.umn-width defect, plasma-frequency defect, and electron-co.lision-frequency defect, are co.cerned. It transpires that introducing a defect in a PPC in different manners may realize the symmetric change, alternative change, shifting, generating, transforming, disappearing, and attenuating of BGs in transmittance spectra, which has great potential for the manufacture of spatiotemporal-co.trollable MW materials and devices with more feasible modulating functions.

关键词： plasma photonic crystal defect mode microwave transmittance

Enabling structural and interfacial stability of 5 V spinel LiNi0.5Mn1.5O4 cathode by a co.erent interface

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Journal of Energy Chemistry 2023年第1期76卷 266-276,I0007页

作者： Min Xu Ming Yang Minfeng Chen Lanhui Gu Linshan Luo Songyan Chen Jizhang Chen Bo Liu Xiang Han co.lege of materials Science and Engineering Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjing 210037JiangsuChina co.lege of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongChina co.lege of Mathematics and Physics Jingangshan UniversityJi'an 343009JiangxiChina Department of Physics Jiujiang Research Institute Xiamen UniversityXiamen 361005FujianChina

Spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO),a 5 V class high voltage cathode,has been regarded as an attractive candidate to further improve the energy density of lithium-ion *** issue simultaneously enabling side stability and maintaining high interfacial kinetics,however,has not yet been ***,we design a co.erent Li_(1.3)A_(l0.3)Ti_(1.7)(PO)_(4)(LATP)layer that is crystally co.nected to the spinel LNMO host lattices,which offers fast lithium ions transportation as well as enhances the mechanical stability that prevents the particle ***,the inactive Li_(3)BO_(3)(LBO)co.ting layer inhibits the co.rosion of transition metals and co.tinuous side ***,the co.erent-engineered LNMO-LATPLBO cathode material exhibits superior electrochemical cycling stability in a window of 3.0–5.0 V,for example a high-capacity retention that is 89.7%after 500 cycles at 200 m A g-1obtained and enhanced rate performance(85.1 m A h g^(-1)at 800 m A g^(-1))when tested with a LiPF6-based carbonate *** work presents a new approach of engineering 5 V class spinel oxide cathode that co.bines interfacial co.erent crystal lattice design and surface co.ting.

关键词： Lithium-ion battery Spinel cathode LATP co.erent interface

Experimental investigation of thermal transfer co.fficient by a simplified energy balance of fault arc in a closed air vessel

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Plasma Science and Technology 2020年第2期22卷 1-9页

作者： Mei LI Yifei WU Peng GONG Lin LI Huadan XU Fei YANG State Key Laboratory of Eco.Hydraulic in Northwest Arid Region Xi'an University of TechnologyXi'an 710048People’s Republic of China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710049People’s Republic of China Henan Electric Power Transmission and Transformation co.struction co.Ltd. Zhengzhou 450000People’s Republic of China

The themial transfer co.fficient that represents the portion of energy heating the surrounding gas of fault arc is a key parameter in evaluating the pressure effects due to fault arcing in a closed electrical *** paper presents experimental research on the thermal transfer co.fficient in a closed air vessel for Cu,Fe and A1 electrode materials over a currcni range from 1-20 kA with an electrode gap from 10-50 mm and gas pressure from 0.05-0.4 *** a simplified energy balance including Joule heating,arc radiation,ihc energies related to electrode melting,vaporization and oxidation co.structed,and the influences of different factors on thermal transfer co.fficient are studied and *** quantitative estimation of the energy co.ponents co.firmed that the pressure rise is closely related to the change in heat transport process of fault *** in co.sideration of the evaluation of Joule healing and *** such as the electrode material,arc current,filling pressure and gap length between electrodes have a co.siderable effect on the thermal transfer co.fficient and thus,the pressure rise due to the differences in the energy balance of fault arc.

关键词： fault arc energy balance pressure rise