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热压缩同时提高挤压镁-锰-锌合金的强度和热导率(英文)

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Transactions of Nonferrous Metals Society of china 2024年

作者：刘海峰杨续跃张宇修 Hiromi Nagaumi 赵明纯石智勇 andrej Atrens School of Mechanical & Mining Engineering， University of Queensland Brisbane 中南大学材料科学与工程学院苏州大学钢铁学院

在这项研究中，对挤压镁-锰-锌合金进行了热压缩处理。合金在 150°c以 15:1 的挤压比挤压，然后沿着挤压方向以真应变为0.9进行热压缩。通过光学显微镜、扫描电子显微镜、电子背散射衍射和透射电子显微镜研究了挤压态和热压缩态Mg-Mn-Z... 详细信息

在这项研究中，对挤压镁-锰-锌合金进行了热压缩处理。合金在 150°c以 15:1 的挤压比挤压，然后沿着挤压方向以真应变为0.9进行热压缩。通过光学显微镜、扫描电子显微镜、电子背散射衍射和透射电子显微镜研究了挤压态和热压缩态Mg-Mn-Zn合金的微观结构、机械性能和热导率。旨在通过获得均匀、细小的显微结构、以及降低织构强度，同时提高强度和导热性。屈服强度（YS）、极限拉伸强度（UTS）和伸长率（EL）得到了显著的提高，分别提高了77%、53%和10%。热导率也得到了显著的提高，从111 W/(m·K)提高到了125 W/(m·K)。本研究阐明了热压缩改善性能的机理，为开发具有优良热性能和力学性能的镁合金提供了一条有前景的途径。

关键词：镁合金热压缩强度热导率

Numerical and experimental analyses of a stirred vessel for a large volumetric flow rate of sparged air

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chinese Journal of chemical Engineering 2019年第10期27卷 2304-2312页

作者： andrej Bombac Jernej Pirnar Laboratory for Fluid Dynamics and Thermodynamics Faculty of Mechanical EngineeringUniversity of LjubljanaAskerceva 61000 LjubljanaSlovenia

computational fluid dynamics(cFD)and experimental analyses of some of the basic characteristics of air sparging in a tall stirred vessel equipped with a three-stage impeller are *** impeller was assembled from a radial ABT impeller as the lower,a turbine 6 PBT45 as the middle and an axial Scaba-type 3SHP1 impeller as the *** the impellers were of the same diameter,i.e.,225 mm,while the vessel diameter was 450 *** impeller’s rotational speed was 178 r·*** aeration regime was established with an air volumetric flow rate of 28.3 m3·*** the best of our knowledge,this study is the first to consider the very high gassing rate by means of cFD in a tank stirred by three-stage axial/radial *** numerical simulation was performed using the ANSYS Fluent(R17.2,2016)code for solving the governing equations of fluid dynamics in single-and multi-phase *** discussing the bubble size distribution,a discrete population balance model(PBM)was *** cFD,the stirring power and the total void fraction(the total gas holdup)were *** results were in good agreement with the measured values using a laboratory experimental device.

关键词： Mixing Stirred vessel Aeration Multiple stirrer High gassing rate Local void fraction

Muscular abnormalities in liver cirrhosis

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World Journal of Gastroenterology 2021年第29期27卷 4862-4878页

作者： andrej Hari Department of Gastroenterology and Hepatology General Hospital CeljeCelje 3000SavinjskaSlovenia

Sarcopenia is becoming a well-established player in evaluating patients with chronic liver *** regarding its clinical significance and consequences in the course of liver disease have been growing;many of the data support the idea that it impacts decompensation event frequency,prolonged hospitalization,and mortality,as well as providing the possibility to better prioritize patients on lists awaiting liver *** assessing the whole clinical scope of the field,which includes malnutrition and frailty,as well as the complete spectrum of muscle mass,strength,and function,it becomes clear that a well-founded approach in everyday clinical practice is *** this respect,this article attempts to unveil the most recently published data regarding possible methods and modalities that could be used to diagnose sarcopenia as early as possible,along with the required accuracy and *** the most important field discoveries to data that need further clarification,the merits and weaknesses of the very diverse existing evaluation methods are ***,a critical overview is given,in an attempt to discern study lines of importance from those that could pose further ambiguity for the *** author also poses relevant questions that remain unanswered but are of clinical importance in the field.

关键词： Sarcopenia Liver cirrhosis Frailty Muscle strength Nutrition indices Risk factors

Distortion performance of underwater acoustic mobile networks

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Journal of Ocean Engineering and Science 2018年第4期3卷 382-389页

作者： andrej Stefanov Faculty of Engineering IBU SkopjeMacedonia

The paper considers the distortion performance of mobile underwater acoustic *** network is composed of autonomous underwater vehicles(AUV’s)that utilize multihop transmissions to route the information through the *** mobility model is direction *** distortion is evaluated in the context of an independent identically distributed(i.i.d.)Gaussian source and single description *** AUV-to-AUV channel experiences frequency dependent path loss and Ricean fading,as well as interference from other network *** examples illustrate the distortion performance.

关键词： network mobile underwater

The effect of growth conditions on the relationship between fine root and foliage biomass

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Journal of Forestry Research 2022年第5期33卷 1585-1591页

作者： Yury Karpechko Anna Karpechko andrej Tuyunen Forest Research Institute of the Karelian Research centre of the Russian Academy of Sciences 11 Pushkinskaya St.PetrozavodskKareliaRussia 185910

This article examines the physiological relationships between fine roots and foliage, and how their biomass ratio correlates with changes in stand quality class. The biomass of fine roots ≤ 3 mm in diameter of spruce stands in the Republic of Karelia (Northwest Russia) was determined by the soil monolith method. Foliage biomass was calculated using a previously designed technique from the standing stock, average height and quality class of the stand. A relation between fine-root: foliage biomass ratio and stand quality class (representing soil fertility) has been established. The closest correlation between fine-root: foliage biomass ratio and stand quality based on soil fertility was for the 1-2 mm root fraction. Analysis of the water flux balance in the trees revealed a correlation between fine-root: foliage ratio and the ratio of the specific volume of transpiration by the stand to the specific volume of water uptake from the soil by roots. Theoretical explanations for the decrease in fine-root: foliage biomass ratios with increasing stand quality class are offered.

关键词： Fine-root biomass Foliage biomass Stand quality class Soil fertility

Recently deepened insights regarding Mg corrosion and advanced engineering applications of Mg alloys

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Journal of Magnesium and Alloys 2023年第11期11卷 3948-3991页

作者： Guang-Ling Song andrej Atrens Department of Ocean Science and Engineering Southern University of Science and Technology1088 Xueyuan BoulevardShenzhen 518055China The University of Queensland School of Mechanical and Mining EngineeringCentre for Advanced Materials Processing and Manufacturing(AMPAM)St LuciaQld 4072 Australia State Key Laboratory of Physical chemistry of Solid Surfaces Xiamen University422 S.Siming RdXiamen 361005China

This review summarizes recent insights into the Mg corrosion mechanism, clarifies many critical controversial points regarding the Mg corrosion behaviour, and updates some efforts made to extend the industrial application of Mg alloys. Based on the new understandings gained so far, future research directions are also suggested in the review. This review has the following logic. The first section "1. Scope"is a consolidation of the new understandings or developments regarding the Mg corrosion mechanism and the new applications for Mg alloys. It also highlights some key points for the review. The second section "2. Widely accepted knowledge" briefly summarizes the general understanding of Mg corrosion gained so far, which acts as the foundation for the following sections. The third section "3. Recently deepened insights" mainly briefs on some new insights into Mg corrosion phenomena based on recent findings. Different interpretations on the corrosion behaviours are comprehensively discussed in the fourth section "4. controversial points" and the conclusions are drawn in the subsection"4.5 clarified points". Apart from the fundamental understandings, various efforts in the application of Mg alloys are presented in the fifth section "5. New applications". Following the research tendency as indicated in the review, prioritized research areas are suggested in "*** directions". The review is concluded with "7. concluding remarks" at last.

关键词： Mg corrosion Hydrogen Anode Intelligentization

Female competition for availability of males in insects:the Nezara viridula(Linnaeus,1758)model

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Insect Science 2020年第4期27卷 801-814页

作者： andrej cokl Alenka Zunic Kosi Raul Alberto Laumann Meta Virant-Doberlet Department of Organisms and Ecosystems Research National Institute of BiologyLjubljanaSI-1000Slovenia Semiochemicals Laboratory Embrapa Genetic Resources and BiotechnologyBrasiliaDF 71070Brazil

Multimodal communication in solitary stinkbugs enables them to meet,mate and *** plant-dwelling species exchange information during the calling phase of mating behavior using substrate-borne vibratory signals.A female-biased gender ratio induces rivalry and competition for a sexual *** competition for males,first described among Heteroptera in three stinkbug species,revealed species specific differences and opened the question of plasticity in individually emitted temporal and frequency signal characteristics during calling and rival *** address this question and gain an insight into the mechanisms underlying stinkbug female rivalry,we compared the characteristics of alternated signals in the southern green stinkbug Nezara viridula(Linnaeus,1758)(Hemiptera:Pentatomidae).compared to male rivalry,female rivalry is more complex,lasts longer and runs through successive phases by a combination of different song *** male pheromone triggers alternation between females,producing song pulses that occasionally overlap each *** female initiates the rivalry by changing individual pulses into pulse trains of three different *** competing female alternates with pulses of changed temporal characteristics at lower levels of rivalry and by varying the frequency characteristics of pulse trains at higher *** female rivalry,the male either stops responding or occasionally emits calling and courtship signals in response to the female that has produced signals of steady temporal *** rivalry shows complex and species specific patterns of information exchange at different levels with a broad-range variation of temporal and frequency characteristics of,until now,unidentified vibratory emissions.

关键词： biotremology female social conflict Nezara viridula rivalry signal discrimination

Structural properties of effective potential model by liquid state theories

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chinese Physics B 2010年第11期19卷 165-173页

作者：向远涛 andrej Jamnik 杨开巍 School of Physics Science and Technology Central South University University of Ljubljana Faculty of Chemistry and Chemical TechnologyAkereva 5SI-1001 LjubljanaSlovenia

This paper investigates the structural properties of a model fluid dictated by an effective inter-particle oscillatory potential by grand canonical ensemble Monte carlo （GcEMc） simulation and classical liquid state theories. The chosen oscillatory potential incorporates basic interaction terms used in modeling of various complex fluids which is composed of mesoscopic particles dispersed in a solvent bath, the studied structural properties include radial distribution function in bulk and inhomogeneous density distribution profile due to influence of several external fields. The GcEMc results are employed to test the validity of two recently proposed theoreticai approaches in the field of atomic fluids. One is an Ornstein-Zernike integral equation theory approach; the other is a third order ＋ second order perturbation density functional theory. Satisfactory agreement between the GcEMc simulation and the pure theories fully indicates the ready adaptability of the atomic fluid theories to effective model potentials in complex fluids, and classifies the proposed theoretical approaches as convenient tools for the investigation of complex fluids under the single component macro-fluid approximation.

关键词： atomic fluid classical ensemble

Anodic hydrogen evolution on Mg

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Journal of Magnesium and Alloys 2021年第6期9卷 2049-2062页

作者： Yang Li Zhiming Shi Xingrui chen andrej Atrens School of Mechanical and Mining Engineering Centre for Advanced Materials and ProcessingThe University of QueenslandSt LuciaQLD 4072Australia

We measured the anodic hydrogen evolution rates for various applied anodic current densities and estimated the corresponding cathodic hydrogen evolution *** estimated cathodic hydrogen evolution rates were less than the measured anodic hydrogen evolution rates,contradicting the enhanced catalytic activity mechanism of Mg *** addition,this model was contradicted by the measured apparent Mg valence of 1.2±*** contrast,the uni-positive Mg^(+)mechanism of Mg corrosion was supported by(i)the apparent Mg valence of 1.2±0.1,and(ii)the fact that the measured anodic hydrogen evolution rate increased with increasing weight loss rate.

关键词： A magnesium B Galvanostatic Potentiostatic Weight loss Hydrogen evolution c Negative difference effect