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Thermal performance of a metal hydride reactor for hydrogen storage with cooling/heating by natural convection

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Energy Storage and Saving 2023年第4期2卷 597-607页

作者： konstantin Borisovich Minko Maksim Nashchekin Department of Engineering Thermophysics Moscow Power Engineering Institute(MPEI)National Research UniversityMoscow111250Russia

Metal hydride(MH)systems can be used for storage in stationary facilities of hydrogen with a high volume density at temperatures and pressures close to ambient ***,the possibility of using passive heating/cooling systems or regenerative heat exchangers has been studied to improve the energy efficiency of MH systems for hydrogen storage without the need for forced circulation of a heating/cooling *** convection of air may be used to passively remove/add heat as required for proper operation of a MH *** these conditions,the MH reactor can operate at a constant ambient air temperature and be driven by a difference in pressure between the source and the consumer of *** operation of MH systems with natural convective heating/cooling has not been systematically investigated as yet,a tubular MH reactor based on this principle is examined in this ***-thirds of the internal volume ofø25.4×1 mm tube is occupied by a composition of LaNi5 and aluminium foam(one linear metre contains 1.1 kg of LaNi5 with a hydrogen capacity of 153 NL H2).Annular fins are used to increase heat transfer to *** and simplified mathematical models of the systems of this class are proposed and *** is shown that acceptable hydrogen charging/discharging rates in such systems are achieved with proper selection of fining *** from a hydrogen source at a pressure of 10 atm and an ambient air temperature of 10 to 30℃ takes 15 min.A reactor with a length of 1 m can desorb almost all stored hydrogen at a minimum outlet pressure of 0.45 bar to feed 30-300 W fuel cells.

关键词： Metal hydride Hydrogen storage Natural convection Annular fins CFD Numerical simulation Optimization

Long-Lasting Stretching Induces Muscle Hypertrophy:A Meta-Analysis of Animal Studies

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Journal of Science in Sport and Exercise 2023年第4期5卷 289-301页

作者： konstantin Warneke Philipp Alexander Freund Stephan Schiemann Institute for Exercise Sport and HealthLeuphana UniversityUniversitätsallee 1LüneburgGermany Institute of Psychology Leuphana UniversityLüneburgGermany

Muscular hypertrophy depends on metabolic exhaustion as well as mechanical load on the *** tension seems to be the crucial factor to stimulate protein *** present meta-analysis was conducted to determine whether stretching can generate adequate mechanical tension to induce muscle *** used PubMed,Web of Science,and Scopus to search for literature examining the effects of long-term stretching on muscle mass,muscle cross-sectional area,fiber cross-sectional area,and fiber *** there was no sufficient number of studies investigating long-lasting stretching in humans,we only included original animal studies in the current ***,we identified 16 studies meeting the inclusion criteria(*** of at least 15 min per day).The 16 studies yielded 39 data points for muscle mass,11 data points for muscle cross-sectional area,20 data points for fiber cross-sectional area,and 10 data points for fiber *** all designs and categories,statistically significant increases were found for muscle mass(d=8.51;95%CI 7.11-9.91),muscle cross-sectional area(d=7.91;95%CI 5.75-10.08),fiber cross-sectional area(d=5.81;95%CI 4.32-7.31),and fiber number(d=4.62;95%CI 2.54-6.71).The findings show an(almost)continuous positive effect of long-term stretching on the listed parameters,so that it can be assumed that stretch training with adequate intensity and duration leads to hypertrophy and hyperplasia,at least in animal studies.A general transferability to humans-certainly with limited effectiveness-can be hypothesized but requires further research and training studies.

关键词： Muscle mass Static stretching Hyperplasia Chronic stretching

CO_(2)-Free Calcium Carbide Manufacturing: Demanded Strategy in the Carbon-Neutral Chemical Industry

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Chinese Journal of Chemistry 2023年第24期41卷 3611-3617页

作者： Dmitriy E.Samoylenko konstantin S.Rodygin Valentine P.Ananikov Institute of Chemistry Saint Petersburg State University7/9 Universitetskaya nabSt.Petersburg199034 Russia Zelinsky Institute of Organic Chemistry Russian Academy of SciencesLeninsky pr.47Moscow119991 Russia

Calcium carbide is considered a possible key component in the sustainable carbon cycle,including convenient recycling of carbon wastes to industrial ***,currently employed CaC2 manufacturing process produces significant amounts of CO_(2).One of the main factors of its appearance is the formation of carbon oxide during the *** reaction of lime ore with coal inevitably results in the formation of CO and the loss of one carbon *** is usually burnt,forming CO_(2) to maintain the required high temperature during synthesis – 2200 ℃.In the present study,we discuss that the use of calcium metal instead of lime represents a good opportunity to prevent CO_(2) emission since the reaction of Ca with carbon occurs in an atom-efficient manner and results in only CaC_(2) at a much lower temperature of 1100 ℃.Here,the reaction of Ca with carbon was successfully tested to synthesize CaC_(2).The desired product was isolated in gram-scale amounts in 97.2% yield and 99% *** environmental friendliness of the proposed method originates from the calculations of the *** is provided concerning the cost factor of Ca within the considered process.

关键词： CO_(2)emission CaC_(2) Carbon cycle Sustainable chemistry Green chemistry

Performance of two complementary machine-learned potentials in modelling chemically complex systems

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npj Computational Materials 2023年第1期9卷 1008-1022页

作者： konstantin Gubaev Viktor Zaverkin Prashanth Srinivasan Andrew Ian Duff Johannes Kästner Blazej Grabowski Institute for Materials Science University of StuttgartPfaffenwaldring 5570569 StuttgartGermany Institute for Theoretical Chemistry University of StuttgartPfaffenwaldring 5570569 StuttgartGermany Scientific Computing Department STFC Daresbury LaboratoryWarrington WA44ADUK Present address:NEC Laboratories Europe GmbH Kurfürsten-Anlage 3669115 HeidelbergGermany

Chemically complex multicomponent alloys possess exceptional properties derived from an inexhaustible compositional *** complexity however makes interatomic potential development *** explore two complementary machine-learned potentials—the moment tensor potential(MTP)and the Gaussian moment neural network(GM-NN)—in simultaneously describing configurational and vibrational degrees of freedom in the Ta-V-Cr-W alloy *** models are equally accurate with excellent performance evaluated against *** achieve root-mean-square-errors(RMSEs)in energies of less than a few meV/atom across 0 K ordered and high-temperature disordered configurations included in the *** for compositions not in training,relative energy RMSEs at high temperatures are within a few meV/***-temperature molecular dynamics forces have similarly small RMSEs of about 0.15 eV/Åfor the disordered quaternary included in,and ternaries not part of *** achieve faster convergence with training size;GM-NNs are faster in *** learning is partially beneficial and should be complemented with conventional human-based training set generation.

关键词： alloy faster complex

Unexpected little helpers: microbiota stimulate systemic antiviral defenses

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Signal Transduction and Targeted Therapy 2022年第11期7卷 4001-4002页

作者： Susanne Klute Helene Hoenigsperger konstantin M.J.Sparrer Institute of Molecular Virology Ulm University Medical CenterUlm89081Germany

In a recent study published in Immunity by Erttmann et al.,an unexpected beneficial role of gut microbiota in protecting mice against invading viruses by promoting low levels of systemic innate immune activation via t... 详细信息

关键词： al. interferon ed.

Development of an Autonomous Flight Control System for Small Size Unmanned Helicopter Based on Dynamical Model

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Journal of Shanghai Jiaotong university(Science) 2007年第6期12卷 744-752页

作者：王赓 Kondak konstantin Marek Musial 盛焕烨吕恬生 Hommel Günter Dept. of Computer Sci. & Eng. Shanghai Jiaotong Univ. Dept. of Computer Sci. & Electronics Technische Univ. Eng. Training Center Shanghai Jiaotong Univ.

It is devoted to the development of an autonomous flight control system for small size unmanned helicopter based on dynamical model. At first, the mathematical model of a small size helicopter is described. After that simple but effective MTCV control algorithm was proposed. The whole flight control algorithm is composed of two parts: orientation controller based on the model for rotation dynamics and a robust position controller for a double integrator. The MTCV block is also used to achieve translation velocity control. To demonstrate the performance of the presented algorithm, simulation results and results achieved in real flight experiments were presented.

关键词： unmanned helicopter dynamical model flight control unmanned aerial vehicle (UAV)

Small Ubiquitin-Like Modifier Conjugating Enzyme with Active Site Mutation Acts as Dominant Negative Inhibitor of SUMO Conjugation in Arabidopsis

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Journal of Integrative Plant Biology 2013年第1期55卷 75-82页

作者： konstantin Tomanov Christian Hardtke Ruchika Budhiraja Rebecca Hermkes George Coupland Andreas Bachmair Department of Biochemistry and Cell Biology Max F. Perutz Laboratories Center for Molecular Biology University of Vienna Department of Plant Molecular Biology University of Lausanne Department of Plant Developmental Biology Max Planck Institute for Plant Breeding Research

Small ubiquitin-like modifier （SUMO） conjugation affects a broad range of processes in plants, including growth, flower initiation, pathogen defense, and responses to abiotic stress. Here, we investigate in vivo and in vitro a SUMO conjugating enzyme with a Cys to Ser change in the active site, and show that it has a dominant negative effect. In planta expression significantly perturbs normal development, leading to growth retardation, early flowering and gene expression changes. We suggest that the mutant protein can serve as a probe to investigate sumoylation, also in plants for which poor genetic infrastructure precludes analysis via loss-of-function mutants.

关键词： Agroinfection conjugating enzyme dominant-negative active site mutation small ubiquitin-like modifier conjugation small ubiquitin-like modifier.

Altitude-dependent distribution of 137Cs in the environment:a case study of Aragats massif, Armenia

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Acta Geochimica 2020年第1期39卷 127-138页

作者： konstantin Pyuskyulyan Stephen P.LaMont Vovik Atoyan Olga Belyaeva Nona Movsisyan Armen Saghatelyan Armenian Nuclear Power Plant MetsamorArmenia Nuclear and Radiochemistry Los Alamos National LaboratoryLos AlamosUSA Radioecology Department Center for Ecological-Noosphere StudiesNAS RA.YerevanArmenia

This paper considers the distribution of technogenic 137Cs and naturally occurring radionuclides:238 U,232 Th and40 R concentrations in soils and 137Cs in atmospheric dry depositions by altitudinal belts of the Aragats mountain massif,Republic of *** soil samples were collected at altitudes from 1000 to 3200 *** the determination of geochemical variability,two soil sampling campaigns were *** dry depositions were sampled from five stations at1100-3200 m collected onto organic fiber filters between June and December 2016.137Cs activity was measured using a high-purity Germanium detector coupled to a multichannel analyzer(Canberra).Results indicated that specific activity of 137Cs in soils at 1000 m is495-528 Bq m^-2,andat3200 mis10,500-11,470 Bq m^-*** correlation observed for 137Cs versus naturally occurring radionuclides,which varies in distribution by *** activities of 137Cs in dry atmospheric depositions varies from 1.06 at 846 m to2.37 Bq m^-2 per quarter at 3200 m and increases as the altitude *** of 137Cs in soil and dry atmospheric deposition correlated significantly,and 137Cs activity in soils and atmospheric dry depositions decrease as the absolute altitude *** 50-year effective dose from exposure to 137Cs fallout varies with altitude from 0.007 to 1.42 m Sv.

关键词： 137Cs Distribution by altitude Naturally occurring radionuclides Topsoil Dry atmospheric depositions Gamma radiation Mountain regions

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土石坝竖向排水的渗流控制(英文)

岩土工程学报 2008年第11期30卷 1657-1660页

作者： Abdelkader Djehiche konstantin Kotchev L.G.C.U. Amar Telidji University Laghouat 03000 Laghouat Algeria Potyteehniea Sofia Bulgaria

水流通过坝体和坝基时存在压力和梯度,这在大坝工程设计中已视为重要因素。但是,在土石坝设计时往往会遇到抵御不利大坝安全因素的排水系统的选型和设计问题。目前,很多工程中虽存在一些效果不错的排水系统,但其缺乏渗流和浸润线位置的... 详细信息

水流通过坝体和坝基时存在压力和梯度,这在大坝工程设计中已视为重要因素。但是,在土石坝设计时往往会遇到抵御不利大坝安全因素的排水系统的选型和设计问题。目前,很多工程中虽存在一些效果不错的排水系统,但其缺乏渗流和浸润线位置的控制,可能会对工程安全产生威胁,或使渗流控制措施达不到经济有效的目的。为此,本文基于均质土坝实验研究取得的成果,研究出在竖向排水体中的渗流量的控制方法,采用这种方法可以对土石坝进行更好的管理。

关键词：渗流土石坝竖向排水排水体位置流量