bluuebunny/crossref_metadata_2025_split huggingface dataset:
Marine corrosion behavior of EH 36 steel in the Black Sea
Authors: Mardare L , Benea L 
Published: August 2019

Abstract
The marine environment is a very aggressive environment for metallic materials, especially for unprotected carbon steel. The steel have a low corrosion resistance in harsh corrosive environment like seawater. However, the most equipments and marine structures are made from carbon steel. The Black Sea is brackish water with low salinity. Due to higher-strength and added excellent toughness and formability, The High Strength Low Alloy (HSLA) steel EH36 is used in shipbuilding and other marine structures. This paper present a comparative investigation regarding the corrosion resistance of: i) uncoated EH36 naval steel, ii) coated EH36 naval steel with a two-component polymeric primer and iii) EH 36 naval steel coated with two-component polymeric primer modified by adding of TiO2 nanoparticles. All three surfaces of steel have been investigated in seawater collected from the Black Sea. In situ electrochemical measurements as: open circuit potential (OCP), polarization resistance (Rp), potentiodynamic polarization (PD) and cyclic voltammetry polarization (CV) were performed to monitor the corrosion process. The results show the improved corrosion resistance of polymeric coatings in marine environment compared with uncoated naval steel.
Microstructure and properties of HEA coating
Authors: Florea R M 
Published: August 2019

Abstract
HEA (high entropy alloy) is a new metallic alloy system which received, in the last period, an impressive role in material science field. The nomenclature of HEA is explained by the fact that the entropy suffers a major change at the mixing of the principal constituents in the alloy. This process, the changing of entropy, helps the formation of solid solution instead of chemical compounds. Thanks to their recorded symmetrical crystal structures, resistances to degradation in corrosive/oxidizing environment, high temperature phase stabilities and favourable mechanical properties, HEAs are classified as possible alternatives for high temperature resistant materials. The paper is structured in five point of interest: introduction, obtaining technologies, microstructures, properties of HEA coatings and conclusions.
Simulation of solidification process of cast-iron and aluminum materials
Authors: Mihai D , Cimpoeşu N , Manole V 
Published: August 2019

Abstract
Numerical analyse present a proper solution in order to investigate and quantify what is difficult to appreciate during technical processes. The simulated results are very close to those obtained experimentally fact that creates a big advantage in simulation process usage. Parameters like filling time and filling sequence, solidification time and cooling rate were evaluated for two metallic materials. Different dimensions and geometries of applicative elements influence considerably the casting behavior of a material even if the process is realized in the same conditions.
Preliminary results on microstructure profile of Cu-based shape memory alloy
Authors: Tudora C , Abrudeanu M , Stanciu S , Anghel D , Plaiaşu G , Rizea V , Ştirbu I , Cimpoeşu R , Coteaţă M 
Published: August 2019

Abstract
Shape memory alloys represent a perfect solution for noiselessly actuation with possibility of natural activation without extra energy consume. Copper-based shape memory alloy represent a cheap solution of classical Nitinol. After melting and heat treatment the experimental alloy was mechanically polished and chemical etched in order to highlight the alloy microstructure in hardened state. In this article results about an experimental alloy microstructure relief are presented. Scanning electron microscopy (SEM, VegaTC demo) and atomic force microscopy (AFM, Nanosurf EasyScan II) were used to analyze the profile of a shape memory alloy based on copper after the annealing heat treatment.
Effects of the chemical composition on the microstructural characteristics of Ti-Nb-Ta-Zr alloys
Authors: Tudoran S , Voiculescu I , Geantă V , Vizureanu P , Mârza Roşca I , Pătraşcu I , Gălbinaşu B M , Ciocoiu R 
Published: August 2019

AbstractAmong the biomedical alloys, titanium based alloys are currently the best solution for implantation as a result of their low levels of toxicity. To improve mechanical properties, a series of chemical compositions of some titanium alloys have been studied over the past 15 years, to provide elasticity values as close as possible to bone. The paper presents the main mechanical and microstructural characteristics of Ti-Nb-Ta-Zr alloys compared to other titanium brands. It was found that in the absence of heat treatments, the highest hardness values (437HV1) were obtained for the Ti15Nb7.6Ta8Zr alloy, and the lowest hardness value (259 HV1) was obtained for the Ti98.4 alloy.
Materials types and selection for carabiners manufacturing: a review
Authors: Burduhos-Nergis D P , Baciu C , Vizureanu P , Lohan N M , Bejinariu C 
Published: August 2019

Abstract
The carabiners are vital components of fall protection systems used in a variety of areas, such as: caving, construction, arboriculture, industry, rescue / evacuation operations etc. Therefore, these metallic links play an important role in preventing work accidents wich are related with fall from heights. During carabiners manufacturing, the material selection occupies an important place among the obtaining steps, because there are a high number of mechanical and chemical properties that must be possessed by the final product, in order to provide adequate user safety. This paper aims to present the manufacturing process and the main properties of the materials used for carabiners, as well as the specific advantages and disadvantages of each type of material.
Particularities of forming behavior for INCONEL 718 superalloy
Authors: Ghiban B , Guragata C M , Serban N 
Published: August 2019

Abstract
Present paper has the aim of establishing the plastic forming behaviour of the INCONEL 718 superalloy used for turbine engines. The experiments were realized in laboratory conditions, on a free falling dawn hammer, with high of free falling about H = 0.2 m, and the falling dawn mass about 71 kg. The determinations were made in the range of temperatures about 1100 – 1250°C, at every 50°C. Finally, the graphics of plastic forming versus temperature and mechanical working versus temperature were drawn. The final conclusion was that the optimum range of temperature for hot working of the INCONEL 718 alloy is 1150 ÷ 1250°C, in which the plastic forming resistance and specific hot working are optimum.
SEM/EDS analyses on shape memory alloy subjected to electrochemical corrosion
Authors: Baciu E R , Vasluianu R I , Bolat M , Bulancea B , Murariu A , Bosînceanu D G 
Published: August 2019

Abstract
The aim of the present paper was to investigate the modifications occurred in the Ti-based shape memory alloy subject to electrochemical corrosion in artificial saliva. By 2D and 3D microscopy and by qualitative determinations of the luminous variation we could notice the effects of electrochemical corrosion tests on the surface of the metallic material, and by EDS determinations (Line and Mapping modes) of the surface chemical composition we could determine the chemical modifications produced following the corrosion tests.
Centerline inhomogeneity of flat products
Authors: Réger M , Fábián E R , Tóth L 
Published: August 2019

Abstract
Defect free casting requires an excellent accordance between steel properties being cast and the technological parameters, especially from the aspect of inner quality and homogeneity of cast products. Typical serious defects of cast slabs is the centerline segregation (CLS). The centerline segregation in slabs develops in a very complicated way, the main factors influencing the CLS pattern are the macrosegregation and the shrinkage of solidifying melt in the mushy area. The centerline section of the slab can be characterized by different chemical composition compared to the average composition and it can contain shrinkage holes, discontinuities and inclusions. In the hot rolling process the complex shape of interdendritic holes will be modified depending on the strain applied. In chemical composition the difference remains and it can be identified even after the soaking period (over 1050 °C). As an example, the center part of an St52 grade hot rolled heavy plates and strips containing CLS can be characterized by a carbon content of 0,3-0,5 wt% and manganese content of 1,7-1,9 wt%. The segregation level – including the carbon content – can hardly be decreased by post heat treatment or annealing.
Advanced glass reinforced epoxy filled fly ash based geopolymer filler: preparation and characterization on piping materials
Authors: Hashim M F A , Abdullah M M A B , Sandu A V , Puskas A , Daud Y M , Zainal F F , Faris M A , Hasri  , Hartati  
Published: August 2019

Abstract
The preparation and characterization of glass reinforced epoxy filled with different weight percentage of geopolymers filler attained from fly ashand epoxy resins are reported limited of study. Recent glass reinforced epoxy pipe are reported exhibits relatively low mechanical properties, which limit their usage in structural applications and in oil and gas industrial. Thus, this restriction could be overcome through the formation of the addition of geopolymer fillers to improve their strength and toughness. The glass fiber was impregnated with different weight percentage and different molarity of fly ash-based geopolymer and epoxy hardener resin. Composite samples were made manually by filament winding technique and cured under room temperature. The sections perpendicular to the fibers and surfaces of the composites were analyzed by means of scanning electron microscope to estimate the adhesion between geopolymer matrices and fiber reinforcement. Relatively, wide range of geopolymer weight percentage from 10 % to 30 % at which can obtain high compressive properties, maximal values of compressive strength is 94.64 MPa and compressive modulus 2373.58 MPa for the sample with 30 % weight percentage of filler loading. These new composites materials show expressively enhanced mechanical properties if matched to straight glass reinforced epoxy pipe without any geopolymer filler. The positive mixture of synthetic method with the use of industrial by-products has acceptable fabricating novel low cost aluminosilicate binders, thanks to their suitable bondin contradiction of materials frequently used in structural application, could be used within the field of oil and gas industry.
Experimental research on reconditioning transmission axles by MAG robotic welding
Authors: Perianu I A , Binchiciu E F , Sîrbu N A , Bîrdeanu A V 
Published: August 2019

Abstract
The current paper presents the experimental program conducted in order to determine the welding technology for shaft bond wheels, of Cr and Ni low alloyed steel, in enhanced condition. The material that makes up the shaft bond wheel is in laminated state, with a diameter of 70 mm and a high tendency to cracks when subjected to welding. During exploitation, these axles are subjected to stress and fatigue which imposes developing materials with equal resistance as well as avoiding concentrators in the joint design. The steel transmission shafts, butt welded together, contain Fe-1.7%Cr-2%Ni type with a 0.4%C, respectively Fe-0.7%Mn-1%Cr type with 0.3%C, with hardness approx. 250HB on the shaft and 350HB on the axle. The preheating and inter-pass temperature, combined with mechanical characteristics of welded joints, that have similar resistance, was performed according to SR EN 1011-2-2004, using the help of equivalent carbon computational relations. Fractometric analysis of deficiency areas extracted from parts used in exploitation, at the beneficiary exploitation site, due to defects, highlighted “fish eye” defects, fatigue cracks, that determined choosing this welding technology, namely robotic, in protective gas environment, Corgon 18 – 82%Ar and 18%CO2, using EN ISO 16834-A G694MMn3Ni1CrMo wire with a diameter of Φ1.6 mm. Welding was performed by maintaining 150°C temperature between layers, at a welding speed of 280 mm/min, power 200±10A, wire feed speed 3.7 m/min, in protective gas, Corgon 18 with a 18.22 l/min flow. The joint was designed so it will have minimum concentration areas and assure cooling of welded zones, after the joint was completely filled. After the repair we extracted samples from the joint, in order to test the weld quality and assimilate the technology. Metallographic and compositional analysis performed on specific areas highlighted improved structures in the center of the weld – zone 2, which ensures a proper tenacity of the joint and a hard coat, at the exterior, that favors the good operation of the assembly under critical fatigue conditions. Results obtained confirm and recommend implementing the developed welding technology into industrial environment.
Application of taguchi’s design of experiments in optimization of metal assisted chemical etching process
Authors: Nordin N M , Azhari A W , Halin D S C , Hashim U , Zaidi S H 
Published: August 2019

Abstract
In this study, statistical analysis using Taguchi’s method was used to investigate the effects of various process parameters involved in metal assisted chemical etching (MACE) of silicon. The process parameters that include etching time and various etchant concentration were selected and visualized in Taguchi modelling. Each sample was then characterized using the field emission scanning electron microscopy (FESEM). All data was then analysed and evaluated using ANOVA and graph modelling in order to visualize the interaction of each model. Results showed that for etching rate, separation and size of Si nanowires, the predicted model is in agreement with the experimental data with R2 of 0.94, 0.99 and 0.98 respectively.
Disinfection apparatus for rice germ and packaging room
Authors: Ketkaew S 
Published: August 2019

Abstract
This paper presents the design and construction of disinfection apparatus for rice germ and packaging room by ripple pluse corona energy using adjust electric field intensity. Using flyback converter principle and controlling of the switching by IC#SG3526. The flyback converter is designed to operate at 20-25 kHz frequency through a DC high voltage high frequency transformer at output voltage of 1 kV to 5 kV, and at the input voltage of 24 VAC, By adapting the stainless tips between aluminium net in electrode cell set, one - hour operating yields the ozone gas (O3) generating capacity of 2.5 ppm to 5.5 ppm and at 3.7 ppm enables eliminate diseases in rice germ and packaging room. In the future can be developed apparatus in the commercial of Thailand 4.0.
Development and justification of optical device for contactless measurement of the displacements of control object surfaces
Authors: Miroshnichenko I P , Parinov I A 
Published: August 2019

Abstract
The results of the development and computational-experimental justification of optical device for contactless measurement of the displacements of control object surfaces by using a laser interferometer are described. The proposed device allows solving actual measurement problems by diagnosing the state of structural materials and researching the strength properties of structures in mechanical engineering, aircraft building, shipbuilding, etc.
Biotechnologies used in wastewater treatment
Authors: Moga I C , Petrescu G , Anghelache G , Pantazi A G , Doroftei B I 
Published: August 2019

AbstractOne of the most efficient biological wastewater treatment process is based on the biofilm carriers’ utilization, on which the microorganisms attaches to form biofilm communities. The biological technology that uses artificial mobile supports is known as the Moving Bed Biofilm Reactor (MBBR) process. To have an efficient attachment of the biomass on the carriers, hydrophilic substrates are needed. To promote biofilm formation and development, the chemical nature of the biofilm carriers should be carefully selected. Most of the biofilm carriers are made from polyethylene. This material has hydrophobic properties. The authors propose a new material with more hydrophilic properties. Talcum is combined with polyethylene resulting a more hydrophilic material. The results regarding the biofilm adhesion on the new material are presented by the authors. Also, the paper presents a laboratory installation for wastewater treatment, on which can be compared different biological treatment processes.
Technical requirements and materials used in firefighters gloves manufacturing
Authors: Arvinte C , Sandu A V , Burduhos-Nergis D D , Bernevig Sava M A , Bejinariu C 
Published: August 2019

Abstract
Ensuring the safety of the operational personnel involved in the intervention actions is a priority for the institutions responsible for the prevention and management of the emergency situations, that's why special attention is paid to the protective performances of the individual protective equipment used. The safety and health of rescuers depend on how the materials used in the manufacture of protective equipment for the action of risk factors behave. This paper presents the conditions that fire protection gloves have to meet, materials used in their manufacture and protective features that ensure the safety of users.
Electrical and thermal characteristics of nitinol wires for linear heat detectors
Authors: Micu C A , Ciubotariu-Ana P , Lohan M N , Mocanita C O , Dumitru M , Bejinariu C 
Published: August 2019

Abstract
In this work were investigated the modifications of electrical and thermal properties that occur with the phase changes (M→A) during heating a Nitinol shape memory alloy wire for using it as a linear heat detector. The investigations were made using three Nitinol wires with different diameters (1; 0.1 and 0.075 mm). For the thermal characterization we used differential scanning calorimetry (DSC Netzsch 200 Maia) using two different heating rates and for resistivity a milliohmmeter (Extech 380560) and a thermocouple. The results were analyzed from the point of sensitivity of the smart element in order to be used as heat variation detector.
Assessment of ionic and anionic surfactants effect on demineralized osteochondral tissue
Authors: Cobzac V , Vereştiuc L , Jian M , Nacu V 
Published: August 2019

Abstract
After demineralization the rabbit distal femoral osteochondral tissues were decellularized, separately with SDS and Triton X-100 for 24, 48 and 72 hours, at concentrations of 2%, 1% and 0.5%, respectively. The greatest DNA removal was achieved with Triton X-100 solutions. Cytotoxicity tests with CSM and chondrocytes have shown good and very good results, but a gradual decrease in cell viability related to the duration of treatment with surfactants compared to the control was registered. The same trend was observed in the cells population test after 7 days, while there was no difference at the 14th day. It was also determined that samples decellularized with SDS have a higher resistance to enzymatic degradation than the control and the decellularized tissue with Triton X-100. The swelling test and elasticity modulus measurements did not show values dependent of the surfactant nature.
Engineering of circular economy and good management of industrial material resources
Authors: Soporan V F , Lehene T R , Pădureţu S , Gabor T 
Published: August 2019

Abstract
The paper proposes a presentation of the mechanisms of institutionalization by which materials engineering becomes an action instrument for the circular economy. In the proposed variant, the designed actions are grouped under the following steps: analysis of the current situation and of the assimilation potential at the level of socio-economical mechanisms from the perspective of eco-responsibility; constructive establishment and functioning of the reglementation framework; innovative technological ideas and the entrepreneurial way of promoting of technical solutions; designing and ensuring finance systems, especially financial instruments. The introduction of specific elements from materials engineering stems from the fact that products and services, no matter how complex, use materials in order to ensure some functionality.
Considerations on the mechanisms for optimizing the relationship between the science and engineering of metallic materials from the perspective of the professional development at university level
Authors: Soporan V F , Lehene T R , Pădureţu S , Gabor T , Crişan M D 
Published: August 2019

Abstract
The paper presents a few considerations regarding the engineering training in the field of metallic materials, according to the present situation in Romania. It presents the following aspects: the issue of engineering training at the specific transition from the centralized economy to the market economy functionalities; problem-solving through personal experiences related to engineering in recent years; structuring the specificities in materials engineering; calibration of the training systems; determining the blueprint of training systems; considerations on the evolution of training systems; conclusions and assessments regarding the priorities of the structure of training in materials engineering. The general conclusion, by addressing the activities carried out within the analysis, is the necessity, at least in Romania, to respect the specifics of engineering activities and to avoid overlaps with what works at the level of “material science”. This is true for all levels of engineering training: bachelor’s degree, master’s degree, doctoral studies.
Types of geoecological research and areas of their application
Authors: Baryshev E , Shmakova K , Yakshina N 
Published: August 2019

Abstract
Planning for the environmental management, construction, as well as forecasting the impact of human activity on the environment, should be carried out based on the provisions of geoecology, which combines relationships in geographical, biological (ecological) and social-production systems. In this case, a systematic approach, as well as knowledge of the links between different systems, will allow us to simulate the level of human impact on the environment and calculate the optimal degree of intervention in its structure. Modern methods of geoecological studies used to assess the impact of human economic activity on the environment are considered, a comparison of geoecological mapping in Russian and foreign studies is carried out, the main stages necessary for conducting geoecological studies are indicated.
Experimental determination of the coefficient of restitution
Authors: Marin M , Vaduva C , Rusu M R , Rusu L 
Published: August 2019

Abstract
The aim of this study is to make an experimental determination of restitution coefficient during the clash between ball and stick in oina game. This study is made using a complex system for movement analysis named VICON, on 17 oina balls, that have different wear stages, in contact with two different sticks that have different texture. We make the measurement of cinematic parameters of specific points that are marked, on the equipment, during movement. These parameters are used for calculate, using 2 methods, the restitutions coefficients. The values of these coefficient are 0.44-0.545. This analysis allows to make a prediction of balls trajectory, based on movement measurement during clash and also help to optimization of motor performance in oina game.