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Effect of Y substitution on the microstructure,magneto-optical,and thermal properties of(Tb_(1−x)Y_(x))_(3)Al_(5)O_(12)transparent ceramics

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Journal of Advanced Ceramics 2024年第4期13卷 529-538页

作者： Lixuan Zhang Dianjun Hu Xiao Li Ziyu Liu Chen Hu Lexiang Wu Tingsong Li dariusz Hreniak Jiang Li Transparent Ceramics Research Center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China Institute of Low Temperature and Structure Research Polish Academy of SciencesWroclaw 50-422Poland

Faraday isolators can prevent the front-end system from disturbance and damage caused by a back-reflected beam,so they are important elements in laser *** magneto-optical materials are the most important component in Faraday isolators,the studies on magneto-optical materials have attracted much attention these ***_(3)Al_(5)O_(12)(TAG)ceramics are considered to be one of the most promising magneto-optical materials for visible to near-infrared wavelength band application because of their outstanding comprehensive magneto-optical ***,the optical quality of TAG ceramics needs further optimization to meet the application *** this work,high optical quality(Tb_(1−x)Y_(x))_(3)Al_(5)O_(12)(x=0,0.05,0.1,0.2,and 0.3)magneto-optical ceramics were fabricated successfully by solid-state reaction sintering combined with hot isostatic pressing(HIP)*** the ceramics obtained showed a single garnet phase for different values of x in the range *** addition of Y_(2)O_(3) was found to suppress the secondary phase and improve optical quality *** ceramic samples obtained had clear grain boundaries and possessed the in-line transmittance values of 82.9%at 1064 nm and 82.2%at 633 nm,*** Verdet constants of(Tb_(1−x)Y_(x))_(3)Al_(5)O_(12)ceramics with x=0,0.05,0.1,0.2,and 0.3 were−188.1,−175.4,−168.5,−143.0,and−119.9 rad/(T·m),*** thermal conductivity of TAG ceramics was found to be 5.23 W/(m·K)at 25℃,and when 20%Y was substituted in place of Tb,the thermal conductivity decreased by only 9.4%.

关键词： (Tb_(1−x)Y_(x))_(3)Al_(5)O_(12)ceramics magneto-optical materials optical quality thermal properties

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The role of tree uprooting in the transporting of sediment and mixing of soil in the Tatra Mountains

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Journal of Mountain Science 2021年第1期18卷 38-50页

作者： dariusz.strz.żowski Institute of Geography and Spatial Management Jagiellonian UniversityGronostajowa 7Kraków 30-387Poland

Tree uprooting is an important process which leads to many geomorphic *** of the most important are the transport of sediment and mixing of *** aim of this article is to make a detailed examination of the magnitude of sediment transport caused by an extreme windthrow event in three severely affected ***,a comparison is made of the windthrow event with a mass movement event in the aspect of the magnitude of sediment transport and soil *** study was conducted in three second-to third-order catchments in the Tatra Mountains,where a strong foehn wind event caused extensive windthrow in 2013,and a high-magnitude rainfall event triggered mass movements in *** volume of sediment uplifted by the uprooting event was calculated based on the mapping of root plates using high-resolution(0.04 m)aerial images and measurements of root plate volumes conducted in the *** volume of sediment transported by shallow landslides was determined based on a Digital Elevation Model(DEM1-m resolution).Windthrows affected 34%,76%,and94%of the area of the investigated *** of the trees had fallen *** direction of treefall was influenced by the slope aspect and *** plates and pits covered 1.3%,4.8%,and 5.4%of the area of the *** flux generated by the uprooting event,calculated for the entire area of each investigated catchment ranged from 8.1×10^(–4) to 9.9×10^(–3) m^(3) m^(–1) event^(–1).This was notably lower than the sediment flux generated by the mass movement event(also calculated for the entire area of each catchment),which was 1.8-6.1×10^(–2)m^(3) m^(–1) event^(–1).By contrast,uprooting affected a much larger area than the mass movement event,which underlines its significant role in the mixing of soil.

关键词： Tree uprooting Windthrow event Slope processes Sediment flux Tatra Mountains

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Dormancy heterogeneity among Arabidopsis thaliana seeds is linked to individual seed size

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Plant Communications 2024年第2期5卷 215-227页

作者： Michal Krzyszton Sebastian P.Sacharowski Veena Halale Manjunath Katarzyna Muter Grzegorz Bokota Ce Wang dariusz Plewczynski Tereza Dobisova Szymon Swiezewski Laboratory of Seeds Molecular Biology Institute of Biochemistry and BiophysicsPAS02-106 WarsawPoland Laboratory of Functional and Structural Genomics Centre of New TechnologiesUniversity of WarsawWarsawPoland Laboratory of Bioinformatics and Computational Genomics Faculty of Mathematics and Information ScienceWarsaw University of TechnologyWarsawPoland Labdeers Ltd. 680-01 BoskoviceCzech Republic

Production of morphologically and physiologically variable seeds is an important strategy that helps plants to survive in unpredictable natural ***,the model plant Arabidopsis thaliana and most agronomically essential crops produce visually homogenous *** automated phenotype analysis,we observed that small seeds in Arabidopsis tend to have higher primary and secondary dormancy levels than large *** analysis revealed distinct gene expression profiles between large and small *** seeds have higher expression of translation-related genes implicated in germination *** contrast,small seeds have elevated expression of many positive regulators of dormancy,including a key regulator of this process,the DOG1 *** in DOG1 expression are associated with differential production of its alternative cleavage and polyadenylation isoforms;in small seeds,the proximal poly(A)site is selected,resulting in a short mRNA ***,single-seed RNA sequencing analysis demonstrated that large seeds resemble DOG1 knockout mutant ***,on the single-seed level,expression of genes affected by seed size is correlated with expression of genes that position seeds on the path toward *** results demonstrate an unexpected link between seed size and dormancy phenotypes in a species that produces highly homogenous seed pools,suggesting that the correlation between seed morphology and physiology is more widespread than initially assumed.

关键词： seed size dormancy DOG1 Arabidopsis

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Spin order and dynamics in the topological rare-earth germanide semimetals

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Science China(Physics,Mechanics & Astronomy) 2024年第10期67卷 113-127页

作者： Yuhao Wang Zhixuan Zhen Jing Meng Igor Plokhikh Delong Wu dariusz J.Gawryluk Yang Xu Qingfeng Zhan Ming Shi Ekaterina Pomjakushina Toni Shiroka Tian Shang Key Laboratory of Polar Materials and Devices(MOE) School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Laboratory for Multiscale Materials and Experiments Paul Scherrer InstitutVilligen PSI CH-5232Switzerland Center for Correlated Matter and School of Physics Zhejiang UniversityHangzhou 310058China Laboratory for Muon-Spin Spectroscopy Paul Scherrer InstitutVilligen PSI CH-5232Switzerland Laboratorium für Festkörperphysik ETH ZürichZürich CH-8093Switzerland

The REAl(Si,Ge)(RE=rare earth)family,known to break both the inversion-and time-reversal symmetries,represents one of the most suitable platforms for investigating the interplay between correlated-electron phenomena and topologically nontrivial ***,we report on systematic magnetic,transport,and muon-spin rotation and relaxation(μSR)measurements on(Nd,Sm)AlGe single crystals,which exhibit antiferromagnetic(AFM)transitions at T_(N)=6.1 and 5.9 K,*** addition,NdAlGe undergoes also an incommensurate-to-commensurate ferrimagnetic transition at 4.5 *** transverse-fieldμSR measurements confirm the AFM transitions,featuring a~90%magnetic volume ***-field(ZF)μSR measurements reveal a more disordered internal field distribution in NdAlGe than in SmAlGe,reflected in a larger transverse muon-spin relaxation rateλTat T<

关键词： magneticWeyl semimetals topological Hall effect spin fluctuations μSR

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The intensity of slope and fluvial processes after a catastrophic windthrow event in small catchments in the Tatra Mountains

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Journal of Mountain Science 2021年第6期18卷 1405-1423页

作者： dariusz.strz.żowski Elżbieta GORCZYCA Kazimierz KRZEMIEŃ Mirosław ŻELAZNY Institute of Geography and Spatial Management Jagiellonian UniversityGronostajowa 7Kraków 30-387Poland

Strong wind events frequently result in creating large areas of windthrow, which causes abrupt environmental changes. Bare soil surfaces within pits and root plates potentially expose soil to erosion. Absence of forest may alter the dynamics of water circulation. In this study we attempt to answer the question of whether extensive windthrows influence the magnitude of geomorphic processes in 6 small second-to third-order catchments with area ranging from 0.09 km^(2) to 0.8 km^(2). Three of the catchments were significantly affected by a windthrow which occurred in December 2013 in the Polish part of the Tatra Mountains, and the other three catchments were mostly forested and served as control catchments. We mapped the pits created by the windthrow and the linear scars created by salvage logging operations in search of any signs of erosion within them. We also mapped all post-windthrow landslides created in the windthrow-affected catchments. The impact of the windthrow on the fluvial system was investigated by measuring a set of channel characteristics and determining bedload transport intensity using painted tracers in all the windthrow-affected and control catchments. Both pits and linear scars created by harvesting tend to become overgrown by vegetation in the first several years after the windthrow. The only signs of erosion were observed in 10% of the pits located on convergent slopes. During the period from the windthrow event in 2013 until 2019, 5 very small(total area <100 m^(2)) shallow landslides were created. The mean distance of bedload transport was similar(t-test, p=0.05) in most of the windthrow-affected and control catchments. The mapping of channels revealed many cases of root plates fallen into a channel and pits created near a channel. A significant amount of woody debris delivered into the channels influenced the activity of fluvial processes by creating alternating zones of erosion and accumulation.

关键词： Fluvial processes Slope processes Windthrow Tree uprooting Channel morphology Tatra Mountains

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基于碳化钼材料CO_(2)加氢制备高附加值化学品的热催化研究进展

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物理化学学报 2024年第4期40卷 26-51页

作者：徐勇庆杨玉瑶武孟娜杨潇潇别璇张时语李清海张衍国张宸伟 Robert EPrzekop Bogna Sztorch dariusz Brzakaski 周会清华大学能源与动力工程系热科学与动力工程教育部重点实验室二氧化碳资源利用与减排技术北京市重点实验室北京100084 Centre for Advanced Technologies Adam Mickiewicz University in PoznanPoznan 61-614 Poland

CO_(2)加氢对于CO_(2)转化制备高附加值化学品和燃料以实现二氧化碳利用及能源储存至关重要。CO_(2)加氢包括甲烷化、逆水煤气变换、甲醇化和CO_(2)直接费托合成等。碳化钼,尤其是其二维材料,由于其低成本和良好的性能而备受关注。在CO_... 详细信息

CO_(2)加氢对于CO_(2)转化制备高附加值化学品和燃料以实现二氧化碳利用及能源储存至关重要。CO_(2)加氢包括甲烷化、逆水煤气变换、甲醇化和CO_(2)直接费托合成等。碳化钼,尤其是其二维材料,由于其低成本和良好的性能而备受关注。在CO_(2)加氢反应中,由于碳的渗入,导致晶格膨胀以及价电子增加,碳化钼基催化剂展现出了类似于贵金属催化剂的性质。碳化钼可以通过程序升温渗碳法、选择性蚀刻法、机械合金合成法、化学气相沉积法、原位热渗碳法以及溶液相合成法等来制备。到目前为止,学者已经对基于碳化钼的材料的CO_(2)转化进行大量研究,这些材料具有良好的CO_(2)转化活性和对目标产物的选择性。碳化钼材料的催化性能可以通过调节碳化钼中的C/Mo比、在碳化钼与负载金属之间建立强的金属-载体相互作用以及调整材料的界面结构来实现。然而,基于碳化钼的热催化CO_(2)转化仍处于初级阶段。本文综述基于碳化钼的热催化CO_(2)加氢制备高附加值化学品和燃料的研究进展,并分析其面临的挑战和机遇。

关键词： CO_(2)加氢碳化钼热催化异相催化 MXenes

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New Leiderman–Khlystov Coefficients for Estimating Engine Full Load Characteristics and Performance

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Chinese Journal of Mechanical Engineering 2019年第6期32卷 192-205页

作者： dariusz Szpica Department of Mechanical Engineering Bialystok University of Technology

The paper presents a method of calculating the full load engine characteristics based on the Leiderman–Khlystov relation. Because the values of the coefficients of the discussed function available in literature were determined for obsolete engine designs, an attempt was made to update them. To this end, a chassis dynamometer was used where a database of results had been built for a variety of vehicles. Following the data collection, the coefficients for variety of fueling system(six groups: fuel injected gasoline and turbocharged gasoline, spark ignition LPG Ⅰ–Ⅱ and Ⅳ generation, naturally aspirated diesel and turbocharged diesel) were determined. The identification of the coefficients was carried out in Matlab-Simulink indicating the applicability of the said function for most of the engines, yet the recent popularity of turbocharged gasoline engines requires an additional analysis of the possibility of use of a different functional description. The full load engine characteristics is a basis for the vehicle performance characteristics and, further, for modeling of traffic in a variety of aspects of the vehicle operation.

关键词： Passenger car Combustion engines Full load engine characteristics Numerical identification

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Numerical assessment of the influence of former mining activities and plasticity of rock mass on deformations of terrain surface

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International Journal of Mining Science and Technology 2021年第2期31卷 209-214页

作者： PawełSikora Marek Wesołowski Department of Mining Faculty of MiningSafety Engineering and Industrial AutomationSilesian University of Technology44-100 GliwicePoland

This paper presents the results of numerical simulations carried out to confirm the influence of former mining activities on deformation of the mining *** assessment of deformation changes was carried out with the use of FLAC3 D program based on the finite difference *** calculations were carried out for the example of actual mining operations in seams 703/1-2 and 707/2 of‘‘Marcel"Coal *** into account the influence of the model’s plastic features and the so-called activation of a higher occurring seam in conducted simulations enabled obtaining a very good description of the measured *** on the results one may state that numerical model can be used to assess the influence of former mining activities and the direction of conducted exploitation on deformations of the mining *** factors are not recognized by geometric-integral theories commonly used for predicting the influence of mining operations on the *** results presented in this paper confirm that the applied method of simulating the phenomenon of reactivation of post-mining goafs is correct.

关键词： Rock mass Numerical modeling Post-mining Goafs Land surface deformations

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The role of astronomical silicates during a cometary outburst

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Research in Astronomy and Astrophysics 2021年第3期21卷 184-192页

作者： Marcin Wesołowski College of Natural Sciences Institute of PhysicsUniversity of Rzesz´owPigonia 1 Street35-310 Rzesz´owPoland

This paper presents a new approach to analyzing the change of cometary *** our considerations,we assume that astronomical silicates(dust agglomerates)and gas are present in the *** assumption is a consequence of the analysis of the result observed during the Rosetta mission to comet67 P/Churyumov-Gerasimenko(abbreviated 67 P/Ch-G).The dimensions of these agglomerates can be up to several ***,the large ones are few compared to particles with dimensions of several *** paper presents the results of calculations on the change in hypothetical comet brightness as a result of its *** calculations take into account the percentage of carbonaceous particles and silicates rich in magnesium.

关键词： comets general cometary outburst

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Coefficient of Engine Flexibility as a Basis for the Assessment of Vehicle Tractive Performance

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Chinese Journal of Mechanical Engineering 2019年第3期32卷 189-197页

作者： dariusz Szpica Faculty of Mechanical Engineering Bialystok University of Technology

The paper attempts to analyze full load characteristics of over 500 combustion engines. Using statistical tools, the author determined the value of the coe cient of flexibility. Engine flexibility is the capability of the engine to adapt to varying loads. Importantly, in the investigations, the author took into account the parameters calculated in the course of the investigations on a chassis dynamometer, i.e., actual, not taken from technical specifications of brand new vehicles. Di erent stages of operating wear allow a better characterization of the population. Subsequent utilization of the results in tractive calculations is more reliable. The engines were divided into in six groups, depending on the type of fuel system: fuel injected gasoline and turbocharged gasoline, spark ignition LPG, naturally aspirated diesel and turbocharged diesel. However, engines running on alternative fuels are characterized with a greater flexibility than the fuel injected base engines. Conformity of flexibility of fuel injected and LPG IV generation engines have been observed,which confirms the appropriateness of engine adaptation to alternative fueling. Gasoline engine supercharging allowed a reduction of the maximum engine speed of the maximum torque, which extends the range of analyzable speeds for flexibility and consequently, the flexibility as such.

关键词： Vehicle Tractive performance Flexibility coe cient Engine characteristics

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