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Fabrication and fracture behaviors of the continuous brittle fiber reinforced tungsten composites fabricated via field-assisted sintering technology

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Tungsten 2025年第1期7卷 172-182页

作者： Rui Shu Yi-Ran Mao Jan W. Coenen Alexis Terra Stephan Sch?nen Johann Riesch Christian Linsmeier Christoph Broeckmann Juelich research center Institute of Energy and Climate Research Plasma Physics (IEK-4) Partner in the Trilateral Euregio Cluster Institute of Materials applications in Mechanical Engineering (IWM) RWTH Aachen University Department of Nuclear Engineering & Engineering Physics University of Wisconsin Madison Central Institute of Engineering Electronics and Analytics Engineering and Technology (ZEA-1) Juelich Research Center Max Planck Institute for Plasma Physics Institute of Materials applications in Mechanical Engineering IWM RWTH Aachen University

Tungsten（W） is a promising candidate material for the plasma-facing components in future fusion ***,it has issues regarding the intrinsic brittleness as well as operational *** fiber reinforced tungsten（W_f/W） composites overcome these issues by using extrinsic toughening *** to neutron irradiation and high-temperature recrystallization during fusion operation,the ductility of the fibers may degrade over a long period of ***,it is necessary to investigate the fracture behavior of W_f/W composites with brittle *** the present work,the tungsten fibers were embrittled by ***,the continuous brittle W_f/W composite with yttrium oxide（Y2O3） interface was fabricated by the field-assisted sintering technology *** microstructure of the prepared W_f/W composites was *** fracture behavior and toughening mechanisms were discussed in detail based on the experimental results of 3-point bending tests and the corresponding finite element *** composites show a pseudo-ductile fracture *** are hindered and deflected by the de-bonded fiber-matrix *** extrinsic toughening mechanisms of interface de-bonding,crack bridging,and fiber pull-out are *** indicates the reinforcement concept still works even though all components in the W_f/W are brittle.

关键词： Field-assisted sintering technology (FAST) Fracture behavior Interface Numerical simulation Wf/W composites

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Bistable switch molecule DPACdCl_(4) showing four physical channels and high phase transition temperature

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Chinese Chemical Letters 2025年第1期36卷 591-596页

作者： Ying-Yu Zhang Jia-Qi Luo Yan Han Wan-Ying Zhang Yi Zhang Hai-Feng Lu Da-Wei Fu Institute for Science and applications of Molecular Ferroelectrics Key Laboratory of the Ministry of Education for Advanced Catalysis MaterialsZhejiang Normal UniversityJinhua 321004China Ordered Matter Science research center Jiangsu Key Laboratory for Science and applications of Molecular FerroelectricsSoutheast UniversityNanjing 211189China

Multiple switchable physical channels within one material or device,encompassing optical,electrical,thermal,and mechanical pathways,can enable multifunctionality in mechanical-thermal-opto-electronic *** integrated encryption and enhanced performance in storage and sensing presents a formidable challenge in the synthesis and functionality of new *** an effort to overcome the complexities associated with these multiple physical functions,this study investigates the large-size crystal of DPACdCl_(4)(DPA=diisopropylammonium),revealing significant features in rare multi-channel *** compound demonstrates the ability to switch between"OFF/0"and"ON/1"states in the mechanical-thermal-opto-electronic ***,DPACd Cl_(4)possesses four switchable physical channels,characterized by a higher phase transition temperature of 440.7 K and a competitive piezo-electric coefficient of 46 pC/***,solid-state NMR analysis indicates that thermally activated molecular vibrations significantly contribute to its multifunctional switching capabilities.

关键词： Organic-inorganic hybrid Phase transition Crystal Perovskite Piezoelectricity

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Numerical Study of Flow and Heat Transfer Characteristics of Shell-and-Tube Molten Salt Electric Heater with Circularly Perforated Baffles

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Journal of Thermal Science 2025年第1期34卷 24-33页

作者： LIN Yongjie ZHANG Cancan WU Yuting ZHANG Yi LU Yuanwei Key Laboratory of Heat Transfer and Energy Conversion National User-Side Energy Storage Innovation Research and Development CenterBeijing University of TechnologyBeijing 100124China

Numerical simulations of the flow and heat transfer characteristics of four shell-and-tube molten salt electric heaters with different perforation rates was ***-and-tube electric heaters have the same geometry and tube arrangement,and all of them use single segmental baffles,but there exist four different baffle openings(φ),i.e.,0%,2.52%,4.06%,and 6.31%.The results indicated that the reasonable baffle opening could significantly reduce the shell-side pressure drop,effectively decreasing the shell-side flow dead zone *** can eliminate the local high-temperature phenomenon on the surface of electric heating tubes,but the heat transfer coefficient is slightly *** perforated schemes significantly reduce shell-side pressure drop compared to the baseline solution without open *** particular,the φ=6.31% scheme exhibits the optimal performance among all the schemes,with a maximum reduction of up to 50.50% in shell-side pressure drop relative to the unopened holes *** heat transfer coefficient is the highest for φ=0%,exhibiting a range of5.26% to 5.73%,5.14% to 5.99%,and 7.31% to 8.54% higher than φ=2.52%,4.06%,and 6.31%,respectively,within the calculated *** composite index h/(Δp)^(1/3)was higher for all open-hole solutions than that for the unopened-hole *** best overall performance was for φ=6.31%,which improved the composite index by15.29%to 17.18%over the unopened-hole solution.

关键词： molten salt electric heater perforated baffles heat transfer

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Revealing the Role of Hydrogen in Highly Efficient Ag-Substituted CZTSSe Photovoltaic Devices:Photoelectric Properties Modulation and Defect Passivation

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Nano-Micro Letters 2025年第4期17卷 166-180页

作者： Xiaoyue Zhao Jingru Li Chenyang Hu Yafang Qi Zhengji Zhou Dongxing Kou Wenhui Zhou Shengjie Yuan Sixin Wu The Key Laboratory for Special Functional Materials of MOE School of Nanoscience and Materials EngineeringNational and Local Joint Engineering Research Center for High-Efficiency Display and Lighting TechnologyCollaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004People’s Republic of China

The presence of SnZn-related defects in Cu_(2)ZnSn(S,Se)_(4)(CZTSSe)absorber results in large irreversible energy loss and extra irreversible electron-hole non-radiative recombination,thus hindering the efficiency enhancement of CZTSSe *** the incorporation of Ag in CZTSSe can effectively suppress the SnZn-related defects and significantly improve the resulting cell performance,an excellent efficiency has not been achieved to date primarily owing to the poor electrical-conductivity and the low carrier density of the CZTSSe film induced by Ag ***,this study exquisitely devises an Ag/H co-doping strategy in CZTSSe absorber via Ag substitution programs followed by hydrogen-plasma treatment procedure to suppress SnZn defects for achieving efficient CZTSSe ***-depth investigation results demonstrate that the incorporation of H in Ag-based CZTSSe absorber is expected to improve the poor electrical-conductivity and the low carrier density caused by Ag ***,the C=O and O-H functional groups induced by hydrogen incorporation,serving as an electron donor,can interact with under-coordinated cations in CZTSSe material,effectively passivating the SnZn-related ***,the incorporation of an appropriate amount of Ag/H in CZTSSe mitigates carrier non-radiative recombination,prolongs minority carrier lifetime,and thus yields a champion efficiency of 14.74%,showing its promising application in kesterite-based CZTSSe devices.

关键词： CZTSSe Ag/H co-doping Photoelectric properties modulation Defect passivation Non-radiative recombination

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Accuracy and Consistency of the Explicit-Invariant Energy Quadratization Approach for the Cahn-Hilliard Equation

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Journal of Mathematical research with applications 2025年第1期45卷 84-104页

作者： Jun ZHANG Fangying SONG Yu ZHANG Computational mathematics research center Guizhou University of Finance and Economics School of mathematics and statistics Guizhou University of Finance and Economics School of mathematics and Stastistics Fuzhou University

It is well known that the explicit-invariant energy quadratization (EIEQ) approach can generate fully decoupled, linear and unconditionally energy-stable numerical schemes, so it is favored by many researchers. However, the undeniable fact is that the numerical method obtained by EIEQ approach preserves the “modified” energy law instead of the original *** is mainly due to the introduction of some auxiliary variables in EIEQ scheme, and the truncation error will make the auxiliary variables deviate from the original definition in the process of numerical calculation. The primary objective of this paper is to address this gap by providing the accuracy and consistency of the EIEQ method in the context of the CahnHilliard equation. We introduce a relaxation technique for auxiliary variables and construct two numerical schemes based on EIEQ. The analysis results show that the newly constructed schemes are not only unconditionally energy stable, linear and fully decoupled, but also can effectively correct the errors introduced by auxiliary variables and follow the original energy ***, several 2D and 3D numerical examples illustrate the accuracy and efficiency of the newly constructed numerical schemes.

关键词： Cahn-Hilliard equation EIEQ unconditionally energy stable fully decoupled Relaxation technique

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Ce-doped TiO_(2)supported RuO_(2)as efficient catalysts for the oxidation of HCl to Cl_(2)

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Journal of Environmental Sciences 2025年第3期149卷 234-241页

作者： Jiahui Liu Fangyuan Dong Yaqi Huang Yanghe Fu Xinqing Lu Rui Ma Fumin Zhang Shuhua Wang Weidong Zhu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Engineering Laboratory for Green Syntheses and Applications of Fluorine-Containing Specialty ChemicalsZhejiang Normal UniversityJinhua 321004China National Engineering Technology research center of Fluoro-Materials Zhejiang Juhua Technology Center Co.Ltd.Quzhou 324004China

Reducing the cost of RuO_(2)/TiO_(2)catalysts is still one of the urgent challenges in catalytic HCl *** the present work,a Ce-doped TiO_(2)supported RuO_(2)catalyst with a low Ru loading was developed,showing a high activity in the catalytic oxidation of HCl to Cl_(2).The results on some extensive characterizations of both Ce-doped TiO_(2)carriers and their supported RuO_(2)catalysts show that the doping of Ce into TiO_(2)can effectively change the lattice parameters of TiO_(2)to improve the dispersion of the active RuO_(2)species on the carrier,which facilitates the production of surface Ru species to expose more active sites for boosting the catalytic performance even under some harsh reaction *** work provides some scientific basis and technical support for chlorine recycling.

关键词： Deacon reaction RuO_(2)/TiO_(2) chlorine recycling HCl oxidation Ce doping

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Optimization of Binary Randomized Response Based on Lanke Privacy and Utility Analysis

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Chinese Journal of Electronics 2025年第1期34卷 242-256页

作者： Yihui Zhou Wenli Wang Jun Yan Zhenqiang Wu Laifeng Lu School of Computer Science Shaanxi Normal University School of mathematics and Statistics Shaanxi Normal University School of mathematics and Computer applications Shangluo College

Currently, it has become a consensus to enhance privacy protection. Randomized response(RR) technique, as the mainstream perturbation mechanism for local differential privacy, has been widely studied. However,most of the research in literature managed to modify existing RR schemes and propose new mechanisms with better privacy protection and utility, which are illustrated only by numerical experiments. We study the properties of generalized binary randomized response mechanisms from the perspectives of Lanke privacy and utility. The mathematical expressions of privacy and utility for the binary RR mechanism are given respectively. Moreover, the comparison principle for privacy and utility of any two mechanisms is proved. Finally, the optimization problem of the binary RR mechanism is discussed. Our work is based on a rigorous mathematical proof of privacy and utility for the general binary RR mechanism, and numerical verification illustrates the correctness of the conclusions. It can provide theoretical support for the design of binary RR mechanism and can be applied in data collection, analysis and publishing.

关键词： Privacy Differential privacy Publishing Perturbation methods Data collection Protection Optimization

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A High-Order Numerical Method Based on Legendre Polynomial Approximation for Fourth-Order Eigenvalue Problem in Cylinder Domain

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Journal of Mathematical research with applications 2025年第2期 195-219页

作者： Jun ZHANG Jihui ZHENG Fangying SONG Computational mathematics research center Guizhou University of Finance and Economics School of Mathematical Sciences Guizhou Normal University School of mathematics and Stastistics Fuzhou University

In this work, an efficient spectral method is proposed to solve the fourth-order eigenvalue problem in cylinder domain. Firstly, the key point of this method is to decompose the original model into a kind of decoupled two-dimensional eigenvalue problem by cylindrical coordinate transformation and Fourier series expansion, and deduce the crucial essential pole conditions. Secondly, we define a kind of weighted Sobolev spaces, and establish a suitable variational formula and its discrete form for each two-dimensional eigenvalue problem. Furthermore, we derive the equivalent operator formulas and obtain some prior error estimates of spectral theory of compact operators. More importantly, we further obtained error estimates for approximating eigenvalues and eigenfunctions by using two newly constructed projection operators. Finally,some numerical experiments are performed to validate our theoretical results and algorithm.

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ON GENERALIZED KISSING NUMBERS OF CONVEX BODIES

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Acta Mathematica Scientia 2025年第1期45卷 72-95页

作者： Yiming LI Chuanming ZONG center for Applied mathematics Tianjin UniversityTianjin300072China

In 1694,Gregory and Newton proposed the problem to determine the kissing number of a rigid material *** problem and its higher dimensional generalization have been studied by many mathematicians,including Minkowski,van der Waerden,Hadwiger,Swinnerton-Dyer,Watson,Levenshtein,Odlyzko,Sloane and *** this paper,we introduce and study a further generalization of the kissing numbers for convex bodies and obtain some exact results,in particular for balls in dimensions three,four and eight.

关键词： convex body generalized kissing number Eg lattice

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Study on the One-year Accuracy of Pulsar Time-scale

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research in Astronomy and Astrophysics 2025年第1期25卷 282-296页

作者： Linlin Wang Zhehao Zhang Chengshi Zhao Zongke Li Minglei Tong National Time Service center Chinese Academy of Sciences Key Laboratory of Time Reference and applications Chinese Academy of Sciences University of Chinese Academy of Sciences

Determining accurate pulsar timing model parameters is essential for establishing TT(PT), a realization of Terrestrial Time (TT) based on a pulsar timescale (PT). This study discusses the impact of different data spans on the accuracy of pulsar timing model parameters when determining pulsar timing model parameters. Using observations of PSR J0437-4715, J1909-3744, J1713+0747, and J1744-1134 from the second data release of the International Pulsar Timing Array (IPTA II, Version A), we compare the accuracy of the timing model parameters determined by these observations with different data spans. The results show for PSR J0437-4715, J1713+0747,and J1909-3744, the amplitude fluctuations of rotational frequency remain within 10-15, 10-14, and 10-14Hz,respectively, when the data spans for determining pulsar timing model parameters exceed 13, 14, and 6 ***, the one-year accuracy of TT(PT) is crucial for its application in timekeeping. By comparing the frequency deviations of TT(PT) relative to TT(BIPM) under both ideal (kr) and actual (kp) conditions across different data spans, we find that when the data span reaches the duration above, the accuracy of TT(PT) surpasses that of TT(TAI) under ideal conditions, slightly inferior under actual conditions. This suggests with improved observational technologies, the accuracy of TT(PT) can be further enhanced.

关键词： (stars:) pulsars: individual (PSRs J1909-3744, J1713+0747, J0437-4715, J1744-1134) methods: data analysis time

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