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Role of compositional changes on thermal,magnetic,and mechanical properties of Fe-P-C-based amorphous alloys

Chinese Physics B 2022年第1期31卷 472-479页

作者： Indah Raya Supat Chupradit Mustafa M Kadhim Mustafa Z Mahmoud Abduladheem Turki Jalil Aravindhan Surendar Sukaina Tuama Ghafel Yasser Fakri Mustafa alexander n bochvar Chemistry Department Faculty of Mathematics and Natural ScienceHasanuddin UniversityMakassarSouth Sulawesi90245Indonesia Department of Occupational Therapy Faculty of Associated Medical SciencesChiang Mai UniversityChiang Mai50200Thailand Department of Dentistry Kut University CollegeKutWasit52001Iraq College of Technical Engineering The Islamic UniversityNajafIraq Department of Pharmacy Osol Aldeen University CollegeBaghdadIraq Department of Radiology and Medical Imaging College of Applied Medical SciencesPrince Sattam Bin Abdulaziz UniversityAl-Kharj 11942Saudi Arabia Faculty of Health University of CanberraCanberraACTAustralia Faculty of Biology and Ecology Yanka Kupala State University of Grodno230023 GrodnoBelarus Department of Pharmacology Saveetha Dental College and HospitalSaveetha Institute of Medical and Technical SciencesChennaiIndia Scientific Research Center Al-Ayen UniversityThi-Qar64001Iraq Department of Pharmaceutical Chemistry College of PharmacyUniversity of MosulMosulIraq Department of Materials Physics Eotvos Lorand UniversityPázmány Péter sétány 1/ABudapest1117Hungary

This work aimed to tune the comprehensive properties of Fe-P-C-based amorphous system through investigating the role of microalloying process on the crystallization behavior,glass forming ability(GFA),soft magnetic features,and mechanical *** minor addition of elements into the system,it was found that the simultaneous microalloying of ni and Co leads to the highest GFA,which was due to the optimization of compositional heterogeneity and creation of near-eutectic ***,the FeConiCuPC amorphous alloy exhibited the best anelastic/viscoplastic behavior under the nanoindentation test,which was owing to the intensified structural fluctuations in the ***,the improved plasticity by the extra Cu addition comes at the expense of magnetic properties,so that the saturation magnetization of this alloying system is significantly decreased compared to the FeCoPC amorphous alloy with the highest soft magnetic *** total,the results indicated that a combination of added elemental constitutes,i.e.,Fe69Co5ni5Cu1P13C7 composition,provides an optimized state for the comprehensive properties in the alloying system.

关键词： Fe-based alloy saturation magnetization glass forming ability viscoplastic

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How big can a walking fish be?A theoretical inference based on observations on four land-dwelling fish genera of South Vietnam

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Integrative Zoology 2022年第5期17卷 849-878页

作者： alexander n.KUZnETSOV Borissiak Paleontological Institute Russian Academy of SciencesMoscowRussia

Comparative study of terrestrial locomotion of 4ﬁsh genera including Anabas,Channa,Clarias,and Monopterus,was performed in experimental setting with the substrate surface of wet *** special adaptations for terrestrial locomotion were ***ﬁsh uses for propulsion on land what it already ***-shaped Monopterus crawls by body undulations in a serpentine or sidewinding technique,the latter of which was not previously observed beyond *** other 3ﬁsh genera walk by body oscillations using stiff appendages as *** they are located anteriorly,as the serrate operculum in Anabas and the preaxial spine of the pectoralﬁn in Clarias,the propulsion is termed prolocomotor,when posteriorly,as the spiny analﬁn in Channa—*** is the heaviestﬁsh walking out of water in our days,quite comparable in size withﬁrst Devonian tetrapods Acan-thostega and Tulerpeton.A theoretical calculation is suggested for the upper size limit of aﬁsh capable of terrestrial walking without special locomotor *** should be roughly 20 cm in the vertical dimension of the trunk,which is just a little above the known size of Devonian tetrapodomorphﬁshes Panderichthys and *** metalocomotor walking technique of Channa is suggested as the closest extant model for terrestrial locomotion at theﬁsh-tetrapod *** major difference is that the metalocomotor propulsor in Channa is represented by the analﬁn,while in tetrapodomorphs by the pelvicﬁ*** sprawled pelvicﬁns were advantageous in respect of reduced requirement for side-to-side tail swinging.

关键词： ﬁsh-tetrapod transition metalocomotor propulsion prolocomotor propulsion snakehead

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A novel strategy of smart manipulation by micro-scale oscillatory networks of the reactionary zones for enhanced extreme thrust control of the next-generation solid propulsion systems

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Defence Technology（防务技术） 2018年第5期14卷 635-642页

作者： alexander n.Lukin Bldg.9 Tupik ZvezdniyTuapseKrasnodar TerritoryRU 352808Russian Federation

The main aim of this research is to get a better knowledge and understanding of the micro-scale oscillatory networks behavior in the solid propellants reactionary zones. Fundamental understanding of the micro-and nano-scale combustion mechanisms is essential to the development and further improvement of the next-generation technologies for extreme control of the solid propellant thrust. Both experiments and theory confirm that the micro-and nano-scale oscillatory networks excitation in the solid propellants reactionary zones is a rather universal phenomenon. In accordance with our concept,the micro-and nano-scale structures form both the fractal and self-organized wave patterns in the solid propellants reactionary zones. Control by the shape, the sizes and spacial orientation of the wave patterns allows manipulate by the energy exchange and release in the reactionary zones. A novel strategy for enhanced extreme thrust control in solid propulsion systems are based on manipulation by selforganization of the micro-and nano-scale oscillatory networks and self-organized patterns formation in the reactionary zones with use of the system of acoustic waves and electro-magnetic fields, generated by special kind of ring-shaped electric discharges along with resonance laser radiation. Application of special kind of the ring-shaped electric discharges demands the minimum expenses of energy and opens prospects for almost inertia-free control by combustion processes. nano-sized additives will enhance self-organizing and self-synchronization of the micro-and nano-scale oscillatory networks on the nanometer scale. Suggested novel strategy opens the door for completely new ways for enhanced extreme thrust control of the solid propulsion systems.

关键词： Solid propulsion systems Extreme thrust control Reactionary zones Micro-scale oscillatory networks Self-organized wave patterns Energy-releasing areas

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new characterizations of finite supersoluble groups

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Science China Mathematics 2008年第5期51卷 827-841页

作者： alexander n SKIBA Department of Mathematics Gomel State University of F.Skorina

Let A be a subgroup of a group G and X a nonempty subset of G. A is called an X-semipermutable subgroup of G if A has a supplement T in G such that for every subgroup T 1 of T there exists an element x ∈ X such that ... 详细信息

关键词： finite groups supplement 2-maximal subgroups X-semipermutable supersoluble groups 20D10

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numerical investigation into the influence of the punch shape on the mechanical behavior of pharmaceutical powders during compaction

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Particuology 2014年第5期12卷 116-131页

作者： alexander Krok Marin Peciar Roman Fekete Slovak University of Technology in Bratislava Faculty of Mechanical EngineeringBratislavaSlovak Republic

During the production of pharmaceutical tablets using powder compaction, certain common problems can occur, such as sticking, tearing, cutting, and lamination. In the past, the compressibility of the powder was calculated only along the axis of the device; consequently, critical areas of the material throughout the volume could not be identified. Therefore, finite element method （FEM） can be used to predict these defects in conjunction with the use of an appropriate constitutive model. This article summarizes the current research in the field of powder compaction, describes the Drucker-Prager Cap model calibration procedure and its implementation in FEM, and also examines the mechanical behavior of powder during compaction. In addition, the mechanical behavior of pharmaceutical powders in relation to changes in friction at the wall of the system is examined, and the dependence of lubrication effect on the geometry of the compaction space is also investigated. The influence of friction on the compaction process for the flat-face, fiat-face radius edge, and standard convex tablets is examined while highlighting how the effects of friction change depending on the shape of these tablets.

关键词： Powder Die compaction FEM

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Tribological properties of the beetle leg joints

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Friction 2024年第12期12卷 2791-2807页

作者： Konstantin nADEIn alexander KOVALEV Stanislav n.GORB Functional Morphology and Biomechanics Zoological InstituteChristian-Albrechts University of KielAm Botanischen Garten 1-924118 KielGermany

Tribological properties of femoro-tibial leg joints in two beetles,darkling beetle Zophobas morio and Congo rose chafer Pachnoda marginata were *** low friction of 0.004 was revealed by the direct measurements in the *** is assumed that semi-solid lubricant functioning as in technical bearings is one of the leading factors of the friction *** of the surface texture and physical chemical properties(hydrophobicity)on the cuticle friction was *** of the surface texture to the tribological properties of contacting surfaces was examined by the measurement in the tribosystem“contacting surface/glass”.It is supposed that coefficient of friction(COF)decreases with decrease of surface *** the same time,no statistically significant correlation was found between the hydrophobicity of the surface and the value of the friction coefficient.

关键词： biotribology friction articulation contact angle surface texture lubrication

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Gradewise Properties of Subgroups and Their Applications

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Algebra Colloquium 2017年第2期24卷 255-266页

作者： Wenbin Guo alexander n. Skiba Department of Mathematics University of Science and Technology of China Hefei 230026 China Department of Mathematics Francisk Skorina Gomel State University Gomel 246019 Belarus

For each finite group E, let O（E） be a binary relation on the set of all subgroups of E. If A and B are subgroups of a finite group G, then we say that the pair （A, B） enjoys the gradewise property （resp., generalized gradewise property） in G if G has a normal series Г：1=G0≤G1≤Gt=Gsuch that for each i=1,...,t,we have （（A∩Gi）Gi-1/BGi-1/Gi-1）∈θ（G/Gi-1）（resp., we have （（A∩Gi）Gi-1/BGi-1/Gi-1）∈θ（G/Gi-1）Using these concepts, we obtain some new characterizations for solubility and supersolubility of finite groups and generalize some known results.

关键词： finite group subgroup functor subgroup bifunctor gradewise property

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Finite groups whose n-maximal subgroups are σ-subnormal

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Science China Mathematics 2019年第7期62卷 1355-1372页

作者： Wenbin Guo alexander n. Skiba School of Mathematical Sciences University of Science and Technology of China Hefei 230026 China Department of Mathematics and Technologies of Programming Francisk Skorina Gomel State University Gomel 246019 Belarus

Let σ={σi | i ∈ I} be some partition of the set of all primes P. A set H of subgroups of G is said to be a complete Hall σ-set of G if every member ≠ 1 of H is a Hall σi-subgroup of G, for some i ∈ I, and H contains exactly one Hall σi-subgroup of G for every σi ∈σ(G). A subgroup H of G is said to be:σ-permutable or σ-quasinormal in G if G possesses a complete Hall σ-set H such that HAx= AxH for all A ∈ H and x ∈ G:σ-subnormal in G if there is a subgroup chain A = A0≤A1≤···≤ At = G such that either Ai-1■Ai or Ai/(Ai-1)Ai is a finite σi-group for some σi ∈σ for all i = 1,..., *** Mn n-1 n, then Mn is said to be an n-maximal subgroup of G. If each n-maximal subgroup of G is σ-subnormal(σ-quasinormal,respectively) in G but, in the case n > 1, some(n-1)-maximal subgroup is not σ-subnormal(not σ-quasinormal,respectively) in G, we write mσ(G)= n(mσq(G)= n, respectively).In this paper, we show that the parameters mσ(G) and mσq(G) make possible to bound the σ-nilpotent length lσ(G)(see below the definitions of the terms employed), the rank r(G) and the number |π(G)| of all distinct primes dividing the order |G| of a finite soluble group G. We also give the conditions under which a finite group is σ-soluble or σ-nilpotent, and describe the structure of a finite soluble group G in the case when mσ(G)=|π(G)|. Some known results are generalized.

关键词： finite group n-maximal subgroup σ-subnormal subgroup σ-quasinormal subgroup σ-soluble group σ-nilpotent group

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non-hydrostatic versus hydrostatic modelings of free surface flows

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Journal of Hydrodynamics 2014年第4期26卷 512-522页

作者：张景新 SUKHODOLOV alexander n. 刘桦 MOE Key Laboratory of Hydrodynamics Shanghai Jiao Tong University Key Laboratory of Estuarine and Coastal Engineering Ministry of Transport School of naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong University Department of Ecohydrology Institute of Fresh-water Ecology and Inland Fisheries MOE Key Laboratory of Hydrodynamics Shanghai Jiaotong University

The hydrodynamics of geophysical flows in oceanic shelves, estuaries, and rivers are often studied by solving shallow water equations under either hydrostatic or non-hydrostatic assumptions. Although the hydrostatic models are quite accurate and cost-efficient for many practical applications, there are situations when the fully hydrodynamic models are preferred despite a larger cost for computations. The present numerical model is implemented by the finite volume method （FVM） based on unstructured grids. The model can be efficiently switched between hydrostatic and non-hydrostatic modules. The case study shows that for waves pro- pagating along the bar a criterion with respect to the shallowness alone, the ratio between the depth and the wave length, is insufficient to warrant the performance of shallow flow equations with a hydrostatic approach and the nonlinearity in wave dynamics can be better accounted with a hydrodynamic approach. Besides the prediction of the flows over complex bathymetries, for instance, over asymmetrical dunes, by a hydrodynamic approach is shown to be superior in accuracy to the hydrostatic simulation.

关键词： hydrostatic non-hydrostatic TVD scheme non-orthogonal grid

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A route to understanding the variability in permafrost distribution under climate change

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Advances in Climate Change Research 2023年第2期14卷 164-165页

作者： alexander n.FEDOROV Melnikov Permafrost Institute Yakutsk 677010Russian Federation

Researchers are concerned about the present state of permafrost,which occupies about 25%of the Earth's *** degradation disturbs the landscape and increases greenhouse gas emissions,creating serious problems for human settlements,infrastructure,new land creation and mineral resource *** in previously stable permafrost systems impact surface hydrology,transform ecosystems,and change the way people live in permafrost。

关键词： landscape greenhouse Earth

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