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China Foundry 2024年第2期21卷 168-174页

作者： Zhi-yong Zhang Jiao-jiao Cheng Jia-qi Xie shi-bing Liu Kun shi Jun Zhao Shenyang Research Institute of Foundry Co. Ltd.CAMShenyang 110022China National Key Laboratory of Advanced Casting Technologies Shenyang 110022China

Titanium matrix composites reinforced with ceramic particles are considered a promising engineering material due to their combination of high specific strength,low density,and high *** this study,the ta15-based composites reinforced with a volume fraction of 10% to 25%(TiB+TiC)were prepared using powder metallurgy and casting *** characterization and phase constitution were examined using optical microscopy(OM),scanning electron microscopy(SEM),and X-ray diffraction(XRD).In addition,the microhardness,room temperature(RT)and high temperature(HT)tensile properties of the composites were *** revealed that the reinforcements are distributed uniformly even in the composites with a high volume of TiB and ***,as the volume fraction exceeds 15%,TiB and TiC particles become coarsening and exhibit rod-like and dendritic-like *** increases gradually from 321.2 HV for the base alloy to a maximum of 473.3 HV as the reinforcement increases to 25vol.%.Tensile test results indicate that a reinforcement volume fraction above 20% is beneficial for enhancing tensile strength and yield strength at high temperatures,but it has an adverse effect on room temperature ***,if the reinforcement volume fraction is below 20%,it can improve high-temperature elongation when the temperature exceeds 600℃.

关键词： titanium matrix composites microstucture microhardness tensile properties in-situ synthesis

NH_(4)Cl-assisted synthesis of taON nanoparticle applied to photocatalytic hydrogen and oxygen evolution from water

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Journal of Energy Chemistry 2024年第7期94卷 541-550页

作者： Yao Xu Kaiwei Liu Jifang Zhang Boyang Zhang Jiaming Zhang Ke shi Haifeng Wang Guijun ma School of Physical Science and Technology Shanghaitech UniversityShanghai 201210China

Oxynitride semiconductors are promising photocatalyst materials for visible light-driven water splitting,while the synthesis of well crystalized oxynitride still remains *** present work,narrow-bandgap taON nanoparticles are synthesized via heating a vacuum-sealed mixture of KtaO_(3),ta and NH_(4)*** method possesses multiple advantages in terms of lower calcination parameter,higher N conversion efficiency and superior photocatalytic activity in comparison with the traditional thermal ammonolysis using NH_(3) gas as a nitrogen *** the analysis of intermediates produced upon the elevation of heating temperature,a gas-solid-phase reaction between taCl_(5) and ta_(2)O_(5) is demonstrated as the final step,which is conducive to decreasing thermal energy barrier and accelerating nitridation *** control of preparation conditions,including calcination temperature and duration,allows for the regulation of surface O/N ratio of taON particles to unity,resulting in optimized photocat-alytic *** assessment and intensity modulated photocurrent spectroscopy provide convincing evidence for improved charge transfer effciency of photoexcited holes at taON surface.A Z-scheme overall water splitting is accomplished by employing the taON as an effective oxygen evolution photocatalyst,SrTiO_(3):Rh as a hydrogen evolution photocatalyst,and reduced graphene oxide(rGO)as a solid-state electron *** work presents a promising strategy for the synthesis of high-quality oxynitride materials in application to photocatalytic water splitting.

关键词： taON Oxynitride synthesis Photocatalyst Water splitting,Hydrogen Z-scheme

Characteristic and optimization of ferrite-rich sulfoaluminate-based composite cement suitable for cold region tunnels

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Journal of Central South university 2024年第8期31卷 2794-2809页

作者： Peng, You Li, Li tan, Xian-jun Qiu, Xin Zheng, Pei-chao Xie, Jun Chen, Wei-zhong Reziwanguli, sha-ta-er School of Infrastructure Engineering Dalian University of Technology Dalian China Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China Xinjiang Academy of Transportation Sciences Co. Ltd. Urumqi China

To develop suitable grouting materials for water conveyance tunnels in cold regions, firstly, this study investigated the performance evolution of ferrite-rich sulfoaluminate-based composite cement (FsaC grouting material) at 20 and 3 °C. The results show that low temperature only delays the strength development of FsaC grouting material within the first 3 d. Then, the effect of four typical early strength synergists on the early properties of FsaC grouting material was evaluated to optimize the early (≤1 d) strength at 3 °C. The most effective synergist, Ca(HCOO)2, which enhances the low-temperature early strength without compromising fluidity was selected based on strength and fluidity tests. Its micro-mechanism was analyzed by XRD, TG, and SEM methods. The results reveal that the most suitable dosage range is 0.3 wt%–0.5 wt%. Proper addition of Ca(HCOO)2 changed the crystal morphology of the hydration products, decreased the pore size and formed more compact hydration products by interlocking and overlapping. However, excessive addition of Ca(HCOO)2 inhibited the hydration reaction, resulting in a simple and loose structure of the hydration products. The research results have reference value for controlling surrounding rock deformation and preventing water and mud inrushes during the excavation in cold region tunnels.

关键词： ferrite-rich sulfoaluminate cement cold zone early strength synergist mechanical property micro-structure pumped storage power

Enhanced piezoelectric performance of Cr/ta non-equivalent co-doped Bi_(4)Ti_(3)O_(12)-based high-temperature piezoceramics

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Journal of Advanced Ceramics 2024年第3期13卷 263-271页

作者： Xuanyu Chen Ziqi ma Bin Li Yejing Dai School of materials Sun Yat-sen UniversityShenzhen 518107China

In this study,(Cr_(1/3)/ta_(2/3))non-equivalent co-doped Bi_(4)Ti_(3)O_(12)(BIT)ceramics were prepared to solve the problem that high piezoelectric performance,high Curie temperature,and high-temperature resistivity could not be achieved simultaneously in BIT-based ceramics.A series of Bi_(4)Ti_(3-x)(Cr_(1/3)ta_(2/3))_(x)O_(12)(x=0-0.04)ceramics were synthesized by the solid-state reaction *** phase structure,microstructure,piezoelectric performance,and conductive mechanism of the samples were systematically *** B-site non-equivalent co-doping strategy combining high-valence ta^(5+)and low-valence Cr^(3+)significantly enhances electrical properties due to a decrease in oxygen vacancy ***_(4)Ti_(2.97)(Cr_(1/3)ta_(2/3))_(0.03)O_(12)ceramics exhibit a high piezoelectric coefficient(d_(33)=26 pC·N^(-1))and a high Curie temperature(TC=687℃).Moreover,the significantly increased resistivity(ρ=2.8×10^(6)Ω·cm at 500℃)and good piezoelectric stability up to 600℃are also obtained for this *** the results demonstrate that Cr/ta co-doped BIT-based ceramics have great potential to be applied in high-temperature piezoelectric applications.

关键词： high temperature piezoelectricity co-doped Bi_(4)Ti_(3)O_(12)(BIT)

Emerging role of galectin 3 in neuroinflammation and neurodegeneration

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Neural Regeneration Research 2024年第9期19卷 2004-2009页

作者： Brian M.Lozinski Khanh ta Yifei Dong Department of Clinical Neuroscience University of CalgaryCalgaryABCanada Deparment of Biochemistry Microbiology&ImmunologyUniversity of SaskatchewanSaskatoonSKCanada

Neuroinflammation and neurodegeneration are key processes that mediate the development and progression of neurological ***,the mechanisms modulating these processes in different diseases remain incompletely *** in single cell based multi-omic analyses have helped to identify distinct molecular signatures such as Lgals3 that is associated with neuroinflammation and neurodegeneration in the central nervous system(CNS).Lgals3 encodes galectin-3(gal3),aβ-galactoside and glycan binding glycoprotein that is frequently upregulated by reactive microglia/macrophages in the CNS during various neurological *** gal3 has previously been associated with non-CNS inflammatory and fibrotic diseases,recent studies highlight gal3 as a prominent regulator of inflammation and neuroaxonal damage in the CNS during diseases such as multiple sclerosis,Alzheimer’s disease,and Parkinson’s *** this review,we summarize the pleiotropic functions of gal3 and discuss evidence that demonstrates its detrimental role in neuroinflammation and neurodegeneration during different neurological *** also consider the challenges of translating preclinical observations into targeting gal3 in the human CNS.

关键词： Alzheimer’s disease galectin 3 microglia multiple sclerosis neurodegeneration neuroinflammation Parkinson’s disease therapeutics

The Protocol of Ultrasonic Backscatter Measurements of Musculoskeletal Properties

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Phenomics 2024年第1期4卷 72-80页

作者： Dongsheng Bi Lingwei shi Boyi Li Ying Li Chengcheng Liu Lawrence HLe Jingchun Luo Sijia Wang Dean ta Center for Biomedical Engineering School of InformationScience and TechnologyFudan University2005 SonghuRoadYangpu DistrictShanghai 200438China Academy for Engineering and Technology Fudan UniversityShanghai 200433China Department of Radiology and Diagnostic Imaging University of AlbertaEdmonton T6G2B7Canada Human Phenome Institute Fudan UniversityShanghai 201203China shanghai Institute of Nutrition and Health Chinese Academyof SciencesShanghai 200031China

This study aims to introduce the protocol for ultrasonic backscatter measurements of musculoskeletal properties based on a novel ultrasonic backscatter bone diagnostic(UBBD)***-energy X-ray absorptiometry(DXA)can be adopted to measure bone mineral density(BMD)in the hip,spine,legs and the whole *** muscle and fat mass in the legs and the whole body can be also calculated by DXA body composition *** on the proposed protocol for backscatter measurements by UBBD,ultrasonic backscatter signals can be measured in vivo,deriving three backscatter parameters[apparent integral backscatter(AIB),backscatter signal peak amplitude(BSPA)and the corresponding arrival time(BSPT)].AIB may provide important diagnostic information about bone *** and BSPT may be important indicators of muscle and fat *** standardized backscatter measurement protocol of the UBBD instrument may have the potential to evaluate musculoskeletal characteristics,providing help for promoting the application of the backscatter technique in the clinical diagnosis of musculoskeletal disorders(MSDs),such as osteoporosis and muscular atrophy.

关键词： Ultrasonic backscatter Musculoskeletal disorders Bone mineral density Muscle mass Fat mass

Washed microbiota transplantation for Crohn’s disease:A metagenomic,metatranscriptomic,and metabolomic-based study

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World Journal of gastroenterology 2024年第11期30卷 1572-1587页

作者： shi-Ju Chen Da-Ya Zhang Xia Wu Fa-Ming Zhang Bo-ta Cui Yi-Hao Huang Zu-Lun Zhang Rui Wang Fei-Hu Bai Graduate School Hainan Medical UniversityHaikou 571199Hainan ProvinceChina Department of Microbiota Medicine&Medical Center for Digestive Diseases The Second Affiliated Hospital of Nanjing Medical UniversityNanjing 210011Jiangsu ProvinceChina Department of gastroenterology The Second Affiliated Hospital of Hainan Medical UniversityHaikou 570216Hainan ProvinceChina

BACKGROunD Fecal microbiota transplantation(FMT)is a promising therapeutic approach for treating Crohn’s disease(CD).The new method of FMT,based on the automatic washing process,was named as washed microbiota transplantation(WMT).Most existing studies have focused on observing the clinical ***,the mechanism of action of FMT for the effective management of CD-particularly in-depth multi-omics analysis involving the metagenome,metatranscriptome,and metabolome-has not yet been *** To assess the efficacy of WMT for CD and explore alterations in the microbiome and metabolome in response to *** We conducted a prospective,open-label,single-center clinical *** CD patients underwent *** clinical responses(defined as a decrease in their CD Activity Index score of>100 points)and their microbiome(metagenome,metatranscriptome)and metabolome profiles were evaluated three months after the *** Seven of the 11 patients(63.6%)showed an optimal clinical response three months *** microbiome diversity significantly increased after WMT,consistent with improved clinical *** of the metagenome and metatranscriptome analyses revealed consistent alterations in certain strains,such as Faecalibac-terium prausnitzii,Roseburia intestinalis,and Escherichia *** addition,metabolomics analyses demonstrated that CD patients had elevated levels of various amino acids before treatment compared to the ***,levels of vital amino acids that may be associated with disease progression(e.g.,L-glutamic acid,gamma-glutamyl-leucine,and prolyl-glutamine)were reduced after *** WMT demonstrated therapeutic efficacy in CD treatment,likely due to the effective reconstruction of the patient’s ***-omics techniques can effectively help decipher the potential mechanisms of WMT in treating CD.

关键词： Crohn’s disease Clinical trials Fecal microbiota transplant Metagenome Metatranscriptome Metabolome

Exponentially Bounded C-semigroup and the Cauchy Initial Value Problems in Complete Random Normed Modules

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Acta mathematica Sinica,English Series 2024年第9期40卷 2195-2212页

作者： Son ta CONG Thang Dang HunG Oanh Le THI Department of mathematics University of ScienceVietnam National University 334 Nguyen TraiThanh XuanHanoiVietnam Faculty of Natural Sciences Hong Duc University565 Quang TrungDong VeThanh HoaVietnam

In this paper,the notion of C-semigroup of continuous module homomorphisms on a complete random normal(RN)module is introduced and *** existence and uniqueness of solution to the Cauchy problem with respect to exponen... 详细信息

关键词： C-semigroup Cauchy problem random normed modules L^(0)-Lipschitz

A robust vector tracking loop structure based on potential bias analysis

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Chinese Journal of Aeronautics 2024年第4期37卷 405-420页

作者： Qiongqiong JIA Yiran LUO Bing XU Li-ta HSU Renbiao WU Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of ChinaTianjin 300300China Interdisciplinary Division of Aeronautical and Aviation Engineering The Hong Kong Polytechnic University999077Hong KongChina Department of Geomatics Engineering University of CalgaryCalgary T2N1N4Canada

This paper proposes a robust vector tracking loop structure based on potential bias analysis. The influence of four kinds of biases on the existing two implementations of Vector Tracking Loops(VTLs) is illustrated by theoretical analysis and numerical simulations, and the following findings are obtained. Firstly, the initial user state bias leads to steady navigation solution bias in the relative VTL, while new measurements can eliminate it in the absolute VTL. Secondly, the initial code phase bias is transferred to the following navigation solutions in the relative VTL, while new measurements can eliminate it in the absolute VTL. Thirdly, the user state bias induced by erroneous navigation solution of VTLs can be eliminated by both of the two VTLs. Fourthly,the multipath/NLOS likely affects the two VTLs, and the induced tracking bias in the duration of the multipath/NLOS would decrease the performance of VTLs. Based on the above analysis,a robust VTL structure is proposed, where the absolute VTL is selected for its robustness to the two kinds of initialization biases;meanwhile, the instant bias detection and correction method is used to improve the performance of VTLs in the duration of the multipath/NLOS. Numerical simulations and experimental results verify the effectiveness of the proposed robust VTL structure.

关键词： Global Navigation satellite System(GNSS) Vector Tracking Loop(VTL) Multipath Non-Line-of-Sight(NLOS) Tracking bias propagation Least Absolute Shrinkage and Selection Operator(LASSO)

Microstructure and Mechanical Properties of the Ti_(62)Nb_(12)Mo_(12)ta_(12)W_(2)Refractory High Entropy Alloy Prepared through Spark Plasma Sintering

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1387-1398页

作者： Zirui Chen Liyuan Wang Jiayu Zhao Guanhua Cui Zhuo gao Zhiyuan Fan Xiaohui shi Junwei Qiao College of materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

A refractory high entropy alloy Ti_(62)Nb_(12)Mo_(12)ta_(12)W_(2)was prepared by mechanical alloying and spark plasma *** microstructure and mechanical properties of the Ti_(62)Nb_(12)Mo_(12)ta_(12)W_(2)alloy were *** experimental results show that the microstructure of the alloy is composed of two BCC phases,an FCC precipitated phase,and the precipitated phase which is a mixture of TiC,TiN and *** alloy exhibits good room temperature compressive *** plasticity of the sample sintered at 1550℃can reach 10.8%,and for the sample sintered at 1600℃,the yield strength can be up to 2032 MPa,in the meantime the plasticity is 9.4%.The alloy also shows high strength at elevated *** yield strength of the alloy exceeds 420 MPa at 900℃,and value of which is still above 200 MPa when the test temperature reaches 1000℃.Finally,the compressive yield strength model at room temperature is *** prediction error of the model ranges from−7.9%to−12.4%,expressing fair performance.

关键词： Refractory high-entropy alloy(RHEA) Mechanical alloying Mechanical properties Model Spark plasma sintering