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Shock Wave Boundary Layer Interaction on Suction Side of Compressor Profile in Single Passage Test Section

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Journal of Thermal Science 2015年第6期24卷 510-515页

作者： Pawel Flaszynski Piotr Doerffer Ryszard Szwaba Piotr Kaczynski michal Piotrowicz The Szewalski Institute of Fluid-Flow Machinery Polish Academy of Sciences (IMP PAN)

The shock wave boundary layer interaction on the suction side of transonic compressor blade is one of the main objectives of TFAST project(Transition Location Effect on Shock Wave Boundary Layer Interaction).In order to investigate the flow structure on the suction side of a profile,a design of a generic test section in linear transonic wind tunnel was *** experimental and numerical results for the flow structure investigations are shown for the flow conditions as the existing ones on the suction side of the compressor *** the sidewalls the suction slots are applied for the corner flow structure *** allows to control the Axial Velocity Density Ratio(AVDR),important parameter for compressor cascade *** results for Explicit Algebraic Reynolds Stress Model with transition modeling are compared with oil flow visualization,schlieren and Pressure Sensitive *** layer transition location is detected by Temperature Sensitive Paint.

关键词：边界层转捩压气机叶片相互作用激波试验段单通道跨音速风洞外形

Numerical Integration over Pyramids

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Advances in Applied Mathematics and Mechanics 2013年第3期5卷 309-320页

作者： Chuanmiao Chen michal Krızek Liping Liu Institute of Computer Science Hunan Normal UniversityChangsha 410081HunanChina Institute of Mathematics Academy of SciencesCZ-11567 PragueCzech Republic Department of Mathematical Sciences Lakehead UniversityThunder BayONP7B 5E1Canada Department of Applied Mathematics Anhui Agricultural UniversityHefei230036AnhuiChina

Pyramidal elements are often used to connect tetrahedral and hexahedral elements in the finite element *** this paper we derive three new higher order numerical cubature formulae for pyramidal elements.

关键词： Reference pyramidal element nonlinear systems of algebraic equations Bramble-Hilbert lemma triangular tetrahedral and pyramidal numbers

Influence of AlTi3C0.15 modification treatment on damping properties of ZnAl10 alloy

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China Foundry 2017年第4期14卷 292-296页

作者： Grzegorz Piwowarski Janusz Buras michal Szucki Department of Foundry Processes Engineering Faculty of Foundry EngineeringAGH University of Science and TechnologyMickiewicza Al.3030-059 CraconePoland

Zn-Al alloys constitute an interesting group of foundry alloys. Due to a relatively low melting temperature, they allow a decrease in energy-consumption of the melting process and alloy preparation. The vibration damping ability is one of the most interesting properties of the Zn-Al alloys. Zn-Al alloys are divided into two groups: the low-aluminium and high-aluminium alloys. The investigated Zn-10 wt.% Al(ZnAl10) alloy is representative of the high-aluminium alloys, which, on account of its tendency of forming coarse-grained structures, has rather low plastic properties, including elongation. In order to improve the plastic properties, a modification treatment is usually applied. The dependence of the damping coefficient of the ultrasound wave on the amount of the introduced inoculant was studied. Investigations were performed using the AlT i3C0.15 inoculant as the modifier of the ZnAl10 alloy. It was found that titanium additions, in a range from 25 to 100 ppm in relation to the melted charge mass, can reduce the damping coefficient value. An increase of the inoculant addition causes a rise of the damping coefficient, which is probably related to the scattering of the ultrasound wave on Al_3Ti and TiC particles introduced with the inoculant.

关键词： modification damping damping coefficient zinc alloys ZnAIIO ultrasound wave

Soil moisture content as a predictor of soil disturbance caused by wheeled forest harvesting machines on soils of the Western Carpathians

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Journal of Forestry Research 2017年第2期28卷 283-289页

作者： michal Allman Martin Jankovsk Valéria Messingerov Zuzana Allmanov Department of Forest Harvesting Logistics and AmeliorationsFaculty of ForestryTechnical University in ZvolenT.G.Masaryka 24960 53 ZvolenSlovakia

Limiting surface soil disturbance caused by forest harvesting machines is an important task and is influenced by the selection of efficient and reliable predictors of such disturbance. Our objective was to determine whether soil moisture content affects soil load bearing capacity and the formation of ruts. Measurements were conducted in six forest stands where various machines operated. We measured the formation of ruts along skid trails in connection with varying soil moisture content. Soil moisture content was determined through the gravimetric sampling method. Our results showed that severe（rut depth16–25 cm） to very severe disturbance（rut depth [26 cm）occurred in forest stands where the instantaneous soil moisture exceeded its plasticity limits defined through Atterberg limits. Atterberg limits of soil plasticity ranged from 26 to 32 % in individual stands. Regression and correlation analysis confirmed a moderately strong relationship（R = 0.52; p ／ 0.05） between soil moisture content and average rut depth. This confirmed that soil moisture is a suitable and effective predictor of soil disturbance.

关键词： disturbance moisture machines stands plasticity harvesting predictor moderately operated limits

Recent Progress in Emerging Two‑Dimensional Transition Metal Carbides

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Nano-Micro Letters 2021年第11期13卷 375-408页

作者： Tianchen Qin Zegao Wang Yuqing Wang Flemming Besenbacher michal Otyepka Mingdong Dong College of Materials Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China Interdisciplinary Nanoscience Center Aarhus University8000 AarhusDenmark Regional Centre of Advanced Technologies and Materials Department of Physical ChemistryFaculty of SciencePalacky University77146 OlomoucCzech Republic

As a new member in two-dimensional materials family,transition metal carbides(TMCs)have many excellent properties,such as chemical stability,in-plane anisotropy,high conductivity and flexibility,and remarkable energy conversation efficiency,which predispose them for promising applications as transparent electrode,flexible electronics,broadband photodetectors and battery ***,up to now,their device applications are in the early stage,especially because their controllable synthesis is still a great *** review systematically summarized the state-of-the-art research in this rapidly developing field with particular focus on structure,property,synthesis and applicability of ***,the current challenges and future perspectives are outlined for the application of 2D TMCs.

关键词： Two-dimensional transition metal carbides Phase diagram Superconductivity Energy conversation and storage Largescale synthesis

Factors shaping life history traits of two proovigenic parasitoids

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Integrative Zoology 2018年第3期13卷 297-306页

作者： michal SEGOLI Shucun SUN Dori ENAVA Jay A.ROSENHEIM Mitrani Department of Desert Ecology The Jacob Blaustein Institutes for Desert ResearchBen-Gurion University of the NegevMidreshet Ben-GurionIsrael Department of Ecology School of Life ScienceNanjing UniversityNanjingChina Embrapa Clima Temperado(Embrapa Temperate Agriculture) PelotasRio Grande do SulBrazil Department of Entomology and Nematology University of California DavisDavisCaliforniaUSA

What shapes the relative investment in reproduction versus survival of organisms is among the key questions in life *** insects mature all their eggs prior to emergence and are short lived,providing a unique opportunity to quantify their lifetime investments in the different *** investigated the initial eggloads and longevity of 2 proovigenic parasitoid wasps:Anagrus erythroneurae and Anagrus daanei,(Hymenoptera:Mymaridae)that develop within leafhopper eggs in both agricultural vineyards and natural riparian habitats in Northern *** collected Vitis *** containing developing parasitoids from 3 natural sites(Knight Landing,American River and Putah Creek)and 3 agricultural vineyards(Solano Farm,Davis Campus and Village Homes).We recorded eggloads at parasitoid emergence and female parasitoid longevity with or without *** predicts that parasitoids from vineyards(where hosts are abundant)would have higher initial eggloads and lower longevity compared with parasitoids from riparian habitats(where hosts are scarce).Although host density and parasitoid eggloads were,indeed,higher in vineyards than in riparian habitats,parasitoid longevity did not follow the predicted *** without feeding differed among field sites,but it was not affected by habitat type(natural vs agricultural),whereas longevity with feeding was not significantly affected by any of the examined ***,longevity was positively,rather than negatively,correlated with eggloads at the individual level,even after correcting for parasitoid body *** combined results suggest a more complex allocation mechanism than initially predicted,and the possibility of variation in host quality that is independent of size.

关键词： Anagrus parasitoids eggload leafhoppers life-history tradeoffs longevity

Erratum to:Influence of structural defects on charge density waves in 1T-TaS_(2)

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Nano Research 2024年第3期17卷 2204-2204页

作者： Iaroslav Lutsyk Karol Szalowski Pawel Krukowski Pawel Dabrowski Maciej Rogala Witold Kozlowski Maxime Le Ster michal Piskorski Dorota A.Kowalczyk Wojciech Rys Rafal Dunal Aleksandra Nadolska Klaudia Toczek Przemyslaw Przybysz Ewa Lacinska Johannes Binder Andrzej Wysmolek Natalia Olszowska Jacek J.Kolodziej Martin Gmitra Takuma Hattori Yuji Kuwahara Guang Bian Tai-Chang Chiang Pawel J.Kowalczyk Faculty of Physics and Applied Informatics University of LodzPomorska 149/15390-236 LodzPoland Faculty of Physics University of WarsawPasteura 502-093 WarsawPoland Faculty of Physics Astronomyand Applied Computer ScienceJagiellonian UniversityLojasiewicza 1130-348 KrakowPoland National Synchrotron Radiation Centre SOLARIS Jagiellonian UniversityCzerwone Maki 9830-392 KrakówPoland Institute of Physics Faculty of SciencePavol JozefŠafárik University in KošicePark Angelinum 904001 KošiceSlovakia Institute of Experimental Physics Slovak Academy of SciencesWatsonova 4704001 KošiceSlovakia Department of Precision Engineering Graduate School of EngineeringOsaka University2-1 Yamada-okaSuita 565-0871Japan Department of Physics and Astronomy University of MissouriColumbiaMissouri 65211USA Department of Physics and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-ChampaignUrbanaIllinois 61801-3080USA

The name of the second author in original paper was unfortunately *** should be“Karol Szalowski”,instead of“Karoli Szalowski”.

关键词： structural charge defects

Dolomite fracture modeling using the Johnson-Holmquist concrete material model:Parameter determination and validation

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第2期13卷 335-350页

作者： michal Kucewicz Pawel Baranowski Jerzy Maachowski Faculty of Mechanical Engineering Institute of Mechanics and Computational EngineeringMilitary University of Technology2 Gen.S.Kaliskiego StreetWarsaw00-908Poland

In this paper,the Johnson-Holmquist concrete(JHC)constitutive model is adopted for modeling and simulating the fracture of dolomite.A detailed step-by-step procedure for determining all required parameters,based on a series of experiments under quasi-static and dynamic regimes,is *** rate coefficients,failure surfaces,equations of state and damage/failure constants are acquired based on the experimental data and finite element *** JHC model with the obtained parameters for dolomite is subsequently validated using quasi-static uniaxial and triaxial compression tests as well as dynamic split Hopkinson pressure bar(SHPB)*** influence of mesh size is also *** shows that the simulated fracture behavior and waveform data are in good agreement with the experimental data for all tests under both quasi-static and dynamic loading *** studies will implement the validated JHC model in small-and large-scale blasting simulations.

关键词： Johnson-Holmquist concrete(JHC)model Rock modeling Dolomite Constitutive modeling Split Hopkinson pressure bar(SHPB) Fracture Triaxial compression

Does Cold Plasma Affect Breaking Dormancy and Seed Germination? A Study on Seeds of Lamb's Quarters(Chenopodium album agg.)

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Plasma Science and Technology 2009年第6期11卷 750-754页

作者： Bozena ERA michal ERY Vitězslav TRANAK Petr PATENKA Milan TICHY Institute of Systems Biology and Ecology Academy of Sciences of the Czech RepublicNa Sadkach 7CZ-370 05 Ceske BudejoviceCzech Republic University of South Bohemia in Ceske Budejovice Faculty of EducationDepartment of PhysicsJeronymova 10CZ-371 15 Ceske BudejoviceCzech Republic Technical University of Liberec Department of Material SciencesHalkova 6CZ-461 17 Liberec 1Czech Republic Charles University in Prague Faculty of Mathematics and PhysicsV Holesovickach CZ-180 00 Praha 8Czech Republic

Low-pressure discharge is applied for stimulation of germination of two seed lots of Lamb＇s Quarters （Chenopodium album agg.） with different starting germinations （17%, 8%） and in different stages of dormancy. Different exposition durations with cold plasma treatment were applied. The variable of the ratio cumulative germination was calculated. The Richards＇ equation was used for curve-fitting and simulation of the growth curves. Population parameters, namely Vi - viability, Me - time, Qu - dispersion, and Sk - skewness, counted from the curves described the germination rate well. Significant differences among Qu confirmed the erratic dormancy and gradual germination of Lamb＇s Quarters. No difference in the Me parameter was found between two tested seed lots, and no interspecies characteristics were changed using low-pressure discharge. The results suggested that plasma treatment changed seed germination in Lamb＇s Quarters seeds.

关键词： chenopodium album fitting treatment parameter. seed germination low-pressure discharge plasma