bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Influence of the Structure on the Fatigue Properties of Al-Mg Cast Alloy
Authors: Uhríčik M. , Palček P. , Chalupová M. , Oravcová M. , Frkáň M. 
Published: October 2017

AbstractThe article will be focused on monitoring the influence of the structure on the fatigue properties of aluminium alloys for the casting of type Al-Mg. As an experimental material were used aluminium alloys EN AC 51200 and EN AC 51500, supplied in a cast state without a heat treatment. They were produced by the continuous casting method. These alloys were selected on the basis of the chemical composition, where the content of most alloying elements is comparable, only in the case of the concentration of magnesium are these alloys significantly different. Fatigue properties of aluminium alloys were tested by three-point bending cyclic loading. The fracture surface of the testing sample was examined using scanning electron microscopy (SEM), where samples were observed on various stages of the fatigue process, their characteristics and differences of fracture surfaces.
The Effect of Additive “B” on the Properties of CO2-Hardened Foundry Sands with Hydrated Sodium Silicate
Authors: Kamińska J. , Angrecki M. , Palma A. , Jakubski J. , Wildhirt E. 
Published: October 2017

AbstractThe results of own studies concerning the application of a new additive to the CO2-hardened sodium water glass foundry sands are presented. The new additive, which is a composition of aqueous solutions of modified polyalcohols, has been designated by the symbol “B” and is used as an agent improving the sand knocking out properties. The scope of studies included various mechanical and technological properties of foundry sand mixtures, such as permeability, friability, life cycle of cores and knocking out properties. Two types of water glass with different values of the silica modulus and density, designated as R145 and R150, were tested. Moulding sands used in the tests were made with the additive “B”. For comparison, a reference sand mixture with water glass but without the additive “B” was also prepared.
Preparation and Evaluation of Properties of Cast Metallic Foams with Regular Inner Structure
Authors: Lichý P. , Elbel T. , Kroupová I. , Radkovský F. 
Published: October 2017

AbstractLately we encounter still more new applications of metallic foams, as well as possible methods of their manufacture. These metallic materials have specific properties, such as large rigidity at low density, in some cases high thermal conductivity, capability to absorb energy, etc. The work is focused on the preparation of these materials using conventional casting technology, which ensures rapid and economically feasible method for production of shaped components. In the experimental part we studied conditions of casting of metallic foams with a regular structure made of ferrous and non-ferrous alloys. For thus obtained castings we evaluated the achieved microstructure and mechanical properties, which determine the possible use of these materials. The samples were subjected to compression tests, by which we investigated deformation behaviour of selected materials and determined the value of energy absorption.
Impact Toughness of Steel WMD After TIG Welding
Authors: Węgrzyn T. , Piwnik J. , Stanik Z. , Węgrzyn D. , Sieteski D. 
Published: October 2017

AbstractThe material selected for this investigation was low alloy weld metal deposit after TIG welding with various amount of oxygen in weld metal deposit (WMD). After TIG process it is difficult to get proper amount of oxygen in WMD on the level much lower than 350 ppm. The highest impact toughness of low alloy WMD corresponds with the amount of oxygen in WMD above 350 ppm. In the paper focuses on low alloy steel after innovate welding method with micro-jet cooling that could be treated as a chance on rising amount of oxygen in weld. Weld metal deposit (WMD) was carried out for TIG welding with micro-jet cooling with various amount of oxygen in WMD. In that paper various gas mixtures (gas mixtures Ar-O2and Ar-CO2) were tested for micro-jet cooling after TIG welding. An important role in the interpretation of the results can give methods of artificial intelligence.
Application of Ammoniacal Solutions for Leaching and Electrochemical Dissolution of Metals from Alloys Produced from Low-Grade E-Scrap
Authors: Rudnik E. 
Published: October 2017

AbstractPaper reports results of the research on the application of ammoniacal solutions (sulfate, chloride, carbonate) for hydrometallurgical treatment of smelted low-grade e-waste. Two Cu-Zn-Sn-Ag-Pb alloys were analyzed in details and discussed. Leaching of copper from the alloys was slow in sulfate solution, but the dissolution rate decreased in chloride and carbonate baths. Anodic alloys dissolution was uniform in sulfate and carbonate electrolytes, but high degradation of the material was observed in chloride bath. Chemical and phase composition of slimes and cathodic deposits produced during electrolysis were characterized. In all cases, separation of copper from other metals was found, but efficiencies of the processes were low.
The Precipitation Processes and Mechanical Properties of Aged Inconel 718 Alloy After Annealing
Authors: Maj P. , Adamczyk-Cieslak B. , Slesik M. , Mizera J. , Pieja T. , Sieniawski J. , Gancarczyk T. , Dudek S. 
Published: October 2017

AbstractInconel 718 is a precipitation hardenable nickel-iron based superalloy. It has exceptionally high strength and ductility compared to other metallic materials. This is due to intense precipitation of the γ’ and γ” strengthening phases in the temperature range 650-850°C. The main purpose of the authors was to analyze the aging process in Inconel 718 obtained in accordance with AMS 5596, and its effect on the mechanical properties. Tensile and hardness tests were used to evaluate the mechanical properties, in the initial aging process and after reheating, as a function of temperature and time respectively in the ranges 650°-900°C and 5-480 min. In addition, to link the mechanical properties with the microstructure transmission microscopy observations were carried out in selected specimens. As a result, factors influencing the microstructure changes at various stages of strengthening were observed. The authors found that the γ’’ phase nucleates mostly homogenously in the temperature range 650-750°C, causing the greatest increase in strength. On the other hand, the γ’ and δ phases are formed heterogeneously at 850°C or after longer annealing in 800°C, which may weaken the material.
The Effect of Nanometric α-Al2O3 Addition on Structure and Mechanical Properties of Feal Alloys Fabricated by Lens Technique
Authors: Łazińska M. , Durejko T. , Polkowski W. 
Published: October 2017

AbstractResults of the first principle study on a fabrication of FeAl intermetallic based alloy with an addition of nanometric αAl2O3(n-Al2O3) particles by the LENS method and a subsequent characterization of the as received materials’ structure and properties, are shown in the present work. A series of samples were manufactured using LENS technique while a control of temperature and the size of melted metal pool. The presence of ceramics nanoparticles was not directly confirmed by microscopy observations. Neither aluminum nor oxygen content was not elevated in the material with n-Al2O3content. Although, indirect methods revealed influence of n-Al2O3addition on the manufactured elements structure. Analyses of porosity has shown that addition of 2% vol. n-Al2O3significantly decreases this feature (~1%), as compared to the reference material made of pure FeAl intermetallic alloy (~5%). The addition of n-Al2O3causes an increase of grain size in Fe40Al intermetallic alloy. An oxidation resistance has been also improved what was associated to the n-Al2O3addition. Four times lower increase of samples mass was noticed for sample with the n-Al2O3addition as compared to the pure Fe40Al intermetallic alloy.
Molybdenum Disulfide (MoS2) Coating on AISI 316 Stainless Steel by Thermo-Diffusion Method
Authors: Akbarzadeh M. , Zandrahimi M. , Moradpour E. 
Published: October 2017

AbstractMolybdenum disulfide (MoS2) is one of the most widely used solid lubricants applied in different ways on the surfaces under friction. In this work, AISI 316 austenitic stainless steel was coated with MoS2, using thermo-diffusion method at different temperatures and times. Coatings properties were investigated using SEM, EDX, XRD and FTIR, Hardness Tester and Roughness tester. The results illustrated the formation of a uniform layer on the surface, containing MoS2and MoO3-Xphases. The thickness, grain size and the hardness of the coatings were 20-50 μm, 400-1000 nm and 350- 550 HV respectively. Friction tests carried out using ball-on-disc method under normal loads of 10 N under ambient conditions showed values of the friction coefficient 0.30-0.40. In addition, the kinetics of diffusion layers between the substrate and the coating were also investigated. It was found that there at steady temperature there is a parabolic relationship between the thickness of the diffusion layer and the treatment time. The activation energy for the process was estimated to be 143 kJ mol−1. Depending on the treatment time and temperature, the thicknesses of diffusion layer varied between 0.5 and 2.5 microns.
An Analysis of Microstructure and Mechanical Properties on Friction Stir Welded Joint of Dissimilar 304 Stainless Steel and Commercially Pure Aluminium
Authors: Balamagendiravarman M. , Kundu S. , Chatterjee S. 
Published: October 2017

AbstractIn this study, friction stir welding of dissimilar 304 stainless steel and commercially pure aluminium was performed under the following condition of tool rotational speed 1000 rpm, traverse speed 60 mm/min and tool tilt angle 2 degree. Microstructural characterisation was carried out by optical microscope, scanning electron microscope (SEM). Optical images shows that the microstructural change is very minimum in steel side when compared to aluminium side due to the difference in mechanical and thermal properties. The intermetallic compound Al3Fe was observed at the interfacial region and stir region of the welded joint. The maximum ultimate tensile strength is 78% of commercially pure aluminium base metal. Microhardness profile was measured across the weld interface and the maximum value reaches at the stir zone due to the formation of intermettalics.
Characterization of Case Hardened AISI 4130 Steel Using Eddy Current Testing
Authors: Gukendran R. , Parameshwaran R. , Ponappa K. 
Published: October 2017

Abstract
Casting is the manufacturing process of pouring the hot liquiduos state metal in to the mold cavity and then allowed it to solidify to obtain the final casting. There are many defects are found in the casting components during the inspection. Some defects are tolerated while others are required to repair. Otherwise the casting component is to be eliminated due to the poor quality level. The aim of the non-destructive inspection is to determine, the flaws, discontinuities on the material, and characteristics of the material. Based on the results by non-destructive evaluation the personnel take the decision on the material object is to be accepted or not as per the criteria. In this paper the hardness attribute of the case hardened AISI 4130 steel samples are studied using Vickers Hardness test. Then the hardness property is correlated with the Eddy Current Testing method. According to the acceptance criterion the suitability of the material is analyzed for the corresponding application or not. In this paper Eddy Current Testing response is analyzed for the AISI 4130 samples to determine the mechanical properties of the material. The main objective of the paper is to investigate the effect of the hardness property of the casting material during various case depth obtained via case hardening process. This technique is effective and best practice for the heat treatment shop floors. By this technique the results are investigated based on the cracks and microstructure of the casting material.
Simulation of Air Entrapment and Resin Curing During Manufacturing of Composite Cab Front by Resin Transfer Moulding Process
Authors: Kuppusamy Raghu Raja Pandiyan , Neogi S. 
Published: October 2017

AbstractMould filling and subsequent curing are the significant processing stages involved in the production of a composite component through Resin Transfer Moulding (RTM) fabrication technique. Dry spot formation and air entrapment during filling stage caused by improper design of filling conditions and locations that lead to undesired filling patterns resulting in defective RTM parts. Proper placement of inlet ports and exit vents as well as by adjustment of filling conditions can alleviate the problems during the mould filling stage. The temperature profile used to polymerize the resin must be carefully chosen to reduce the cure time. Instead of trial and error methods that are expensive, time consuming, and non-optimal, we propose a simulation-based optimization strategy for a composite cab front component to reduce the air entrapment and cure stage optimization. In order to be effective, the optimization strategy requires an accurate simulation of the process utilizing submodels to describe the raw material characteristics. Cure reaction kinetics and chemo-rheology were the submodels developed empirically for an unsaturated polyester resin using experimental data. The simulations were performed using commercial software PAM RTM 2008, developed by ESI Technologies. Simulation results show that the use of increase in injection pressure at the inlet filling conditions greatly reduce the air entrapped. For the cab front, the alteration of injection pressure with proper timing of vent opening reduced the air entrapped during mould filling stage. Similarly, the curing simulation results show that the use of higher mould temperatures effectively decreases the cure time as expected.
Parameter Characterization in Processing of Silver – Aluminum Based Electrical Contact Materials
Authors: Kumar S. Praveen , Parameshwaran R. , Ananthi A. , Sam J. Jenil Jaba 
Published: October 2017

AbstractAn electrical contractor is one which plays significant role in day todays life in industries as well as in home appliances. In current scenario the materials for conducting purpose has an overwhelming research capability. Now a day the silver based electrical contact composite material have provided the potential applications in aerospace and automobile industries. Among silver based contact material the silver cadmium oxide and silver tin oxide plays a vital role in fabrication of electrical contactors. In this research an attempt has been made to study the influence of adding Aluminum with silver based electrical contact composite materials by two different processing routes namely stir-casting and powder metallurgy. Silver and aluminum matrix plays a virtual role in composite world owing to their highest conductivity. Optimum parameters were identified for attaining the maximum properties such as conductivity, hardness, density, and porosity of composition. By this better conducting property and mechanical property of the electrical contact can be improved by this system. Thus a screening test has be conducted with addition of Al with silver tin oxide compositions hence this paper aims to process the aluminum - silver based electrical contact materials by stir casting processing and powder metallurgy route and compare the results obtained.
Optimization of Packing Density of M30 Concrete With Steel Slag As Coarse Aggregate Using Fuzzy Logic
Authors: Arivoli M. , Malathy R. 
Published: October 2017

Abstract
Concrete plays a vital role in the design and construction of the infrastructure. To meet the global demand of concrete in future, it is becoming a challenging task to find suitable alternatives to natural aggregates. Steel slag is a by-product of steel making process. The steel slag aggregates are characterized by studying particle size and shape, physical and chemical properties, and mechanical properties as per IS: 2386-1963. The characterization study reveals the better performance of steel slag aggregate over natural coarse aggregate. M30 grade of concrete is designed and natural coarse aggregate is completely replaced by steel slag aggregate. Packing density of aggregates affects the characteristics of concrete. The present paper proposes a fuzzy system for concrete mix proportioning which increases the packing density. The proposed fuzzy system have four sub fuzzy system to arrive compressive strength, water cement ratio, ideal grading curve and free water content for concrete mix proportioning. The results show, the concrete mix proportion of the given fuzzy model agrees with IS method. The comparison of results shows that both proposed fuzzy system and IS method, there is a remarkable increase in compressive strength and bulk density, with increment in the percentage replacement of steel slag.
Deflection of Steel Reinforced Concrete Beam Prestressed With CFRP Bar
Authors: Selvachandran P. , Anandakumar S. , Muthuramu K.L. 
Published: October 2017

AbstractCarbon Fiber Reinforced polymer (CFRP) bars are weak in yielding property which results in sudden failure of structure at failure load. Inclusion of non-pretensioned steel reinforcement in the tension side of CFRP based prestressed concrete beam will balance the yielding requirements of member and it will show the definite crack failure pattern before failure. Experimental investigation has been carried out to study the deflection behavior of partially prestressed beam. Experimental works includes four beam specimens stressed by varying degree of prestressing. The Partial Prestressing Ratio (PPR) of specimen is considered for experimental works in the range of 0.6 to 0.8. A new deflection model is recommended in the present study considering the strain contribution of CFRP bar and steel reinforcement for the fully bonded member. New deflection model converges to experimental results with the error of less than 5% .
Effect of Annealing, Stoichiometry, and Surface on Magnetism of (Pr,Dy)FeCoB Microparticles Ensemble
Authors: Kablov E.N. , Ospennikova O.G. , Kunitsyna E.I. , Piskorskii V.P. , Korolev D.V. , Morgunov R.B. 
Published: October 2017

AbstractMagnetic properties of powder (Pr,Dy)FeCoB ferrimagnetic alloys and effects of annealing, surface states were analyzed. X-ray photoelectron spectroscopy and Mössbauer spectra of powders indicate the effect of surface states on phase composition and magnetic properties of the studied powder, if particles average size is smaller than 10 μm. Effect of stoichiometry on magnetic anisotropy was found. Thermal stability of anisotropy field was proved by replacement of Fe atoms with Co atoms.
The Baobab: Translanguaging in a multimodal sign language translation project
Authors: Murray Joseph J. 
Published: October 2017

AbstractThis article offers a case study of language ideologies and languaging in the translation of a bilingual bimodal iPad storybook app,The Baobab Tree, from American Sign Language and written English to Norwegian Sign Language and written Norwegian. Heeding Canagarajah’s (2011, Translanguaging in the classroom: Emerging issues for research and pedagogy.Applied Linguistics Review2. 1–28) call for studies which look beyond the product to the processes involved by people navigating linguistic and semiotic diverse environments, this article looks at choices made by project team members in a language locality (Pennycook 2010,Language as a local practice. London: Routledge.) shaped by multiple language ideologies. During the process of translation the project team adopted a flexible-multiple model of pluriliteracy (Garcia 2009,Bilingual Education in the 21st Century: A Global Perspective. Wiley-Blackwell) at odds with their initially more rigid preconceptions of languages as bounded entities. The concept of semiotic assemblages (Pennycook 2017, Translanguaging and semiotic assemblages.International Journal of Multilingualism14(3). 269–282) is helpful in showing how languaging choices are influenced by language ideologies, sociocultural values, and the history of language practices among project team members in a particular language locality.
Reverse transcriptase sequences from mulberry LTR retrotransposons: characterization analysis
Authors: Ma Bi , Kuang Lulu , Xin Youchao , Hou Fei , He Ningjia 
Published: October 2017

AbstractCopiaandGypsyplay important roles in structural, functional and evolutionary dynamics of plant genomes. In this study, a total of 106 and 101,CopiaandGypsy reverse transcriptase(rt) were amplified respectively in theMorus notabilisgenome using degenerate primers. All sequences exhibited high levels of heterogeneity, were rich in AT and possessed higher sequence divergence ofCopia rtin comparison toGypsy rt. Two reasons are likely to account for this phenomenon: a) these elements often experience deletions or fragmentation by illegitimate or unequal homologous recombination in the transposition process; b) strong purifying selective pressure drives the evolution of these elements through “selective silencing” with random mutation and eventual deletion from the host genome. Interestingly, mulberryrtclustered with otherrtfrom distantly related taxa according to the phylogenetic analysis. This phenomenon did not result from horizontal transposable element transfer. Results obtained from fluorescence in situ hybridization revealed that most of the hybridization signals were preferentially concentrated in pericentromeric and distal regions of chromosomes, and these elements may play important roles in the regions in which they are found. Results of this study support the continued pursuit of further functional studies ofCopiaandGypsyin the mulberry genome.
New social cooperation model in service oriented economy: the case of employee financial participation in the Baltic states
Authors: Civinskas Remigijus , Dvorak Jaroslav 
Published: October 2017

AbstractThe article discusses the issues of employee financial participation in Baltic states which differs and depends on political, legal and economic preconditions. The aim of the research is to analyse employee financial participation as an instrument for collaboration in companies and a new social cooperation model in the Baltic states. The qualitative research was conducted by telephone and e-mail in 2016. The interviews were carried out with the experts (academics, civil servants, lawyers and human resource consultants working in a relevant field) as well some trade union and company representatives. In general, the new policy for supporting employee financial participation has been renewed in Latvia and Lithuania. It started recently with the revision of the legislative framework that was initially established during the privatisation period. The revision of the Law of Companies was driven by the business interest (to have a new effective human resource management tool or to transfer employee share plans from parent companies in Western countries to subsidiaries in the Baltic states) to introduce (or revise, in the case of Lithuania) new employee share ownership (ESO) plans. The research has also proven that there are common similarities in the use of employee financial participation plans despite the existing differences which are based on national features, such as tax and legal regimes, historical development patterns, or economic and structural factors.