bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fractal geometry of the fatigue fracture surface of the ZTA composites
Authors: Korobenkov M V , Kiseleva T A 
Published: April 2020

Abstract
A fracture surface of the ceramic composite Al2O3 - ZrO2 at three-point bending during fatigue loading has been studied by scanning electron microscope. The bending strength and flexural modulus are derived under static conditions at a loading rate of 3 mm/min. The fatigue strength and fatigue limit are investigated at a frequency of 4 Hz in three stress ranges: 0.9, 0.8 and 0.7 of the average maximum static bending strengths. The surface fractal dimensions Df
is determined using triangulation method. It was shown that the surface relief can be characterized by fractal relief in the local approximation. The fractal dimensionality of the studied surface changes in the relatively narrow limits Df
= 2.653 - 2.742, for ceramic samples sintered at 1650 °C, and highly dependent on the number of cycles. The ceramic samples sintered at 1400 °C showed low resistance to fatigue loads with the fractal dimensionality Df
= 2.710 - 2.781, which are independent of the number of cycles.
Plastic strain localization in surface-hardened titanium polycrystals
Authors: Emelianova E S , Romanova V A 
Published: April 2020

Abstract
In this paper, features of plastic strain localization in commercial purity titanium surface-hardened by ultrasonic impact treatment (UIT) are numerically investigated. Three- dimensional polycrystalline structures inherent in unhardened and UIT surface-hardened titanium specimens are generated by a step-by-step packing method. For taking into account the deformation mechanisms at the micro- and mesoscales, constitutive equations describing a nonlinear behavior of individual grains are constructed using crystal plasticity theory. Quasi-static boundary value problems are solved in a dynamic statement using ABAQUS\Explicit finite-element package to simulate uniaxial tension of the model polycrystalline specimens. Based on the calculation results, conclusions are drawn on the effect of the UIT surface- hardened layer on the plastic strain localization and deformation-induced surface roughening in model polycrystals.
Software development network diagnostics industrial complexes
Authors: Narimanova G N , Zhuravlev V S , Narimanov R K , Zorkalcev A A 
Published: April 2020

Abstract
The article is devoted to the development of software for network diagnostics of industrial networks. The relevance of this topic is determined by the growing object of automated production. The reliability and effectiveness of their autonomous operation are directly related to the quality of remote monitoring and control of industrial complexes. The paper presents an assessment of the key parameters of the existing network diagnostics systems. Considered cross-platform, mobile technology used, the speed of reaction and the breadth of the functions implemented in the most common modern systems. A comparative analysis is given and the advantages of the software offered by the authors are shown.
Inorganic pigments based on transition-metal oxometallates for protective and decorative aluminophosphate-bonded coatings
Authors: Nazarova A Yu , Radishevskaya N I 
Published: April 2020

Abstract
Transition-metal oxometallate-based pigments deposited on a dispersed silicate mineral (marshalite, wollastonite) have a bright color and high light- and acid resistance. It is shown that these pigments can be used for protective and decorative aluminophosphate-bonded coatings. Thermal analysis performed on the thermal analyzer SDT Q600 shows that the structure of protective and decorative coatings remains unchanged to temperatures of about 900 °C. Optical studies (Axiovert 200M) demonstrate that colored coatings subjected to heat treatment have a uniform structure without cracks and, therefore, can be used for metal and concrete surfaces. X-ray diffraction (DRON-UM1 diffractometer, CuKα radiation) confirm that the coating contains AlPO4, Al(PO3)3 and Al(H2PO4)3 phases, quartz, and pigment. The insignificant amount of Al3(OH)3(PO4)2·H2O phase is detected.
To the study of vibration of materials with coatings in the presence of defects
Authors: Telyatnikov I S , Pavlova A V 
Published: April 2020

Abstract
In the paper a new method for studying the properties of deformable bodies with coatings is developed. We considered two models of the foundation: a homogeneous elastic layer with clamped lower edge and a two-layer packet containing a flat rigid inclusion located in the plane of the substrate elastic properties. We used the method of eigenfunctions in the study of the problem concerning steady-state oscillations of a deformable material with a cracked coating. For a foundation that does not contain defects, we described a method for the determination of main parameters characterizing the stress-strain state of a structure with a cracked coating composed of two long plates. We considered a continuous coating for the model of defective foundation. In the course of our study we obtained the relations for determining the characteristics of the stress-strain state of coating/substrate systems as well as presented an example of the application of the method for studying edge effects near the junction boundaries of a composite coating.
Determining non-stationary state of solid-propellant rocket engine model based on numerical conjugate problem solution
Authors: Zhukov A P , Belov S V , Ponomarev S V 
Published: April 2020

Abstract
This paper describes the solid-propellant rocket engine structure, including casing and filler. The gas flows within the filler channel. Based on numerical conjugate problem solution, non-stationary stress-strain states of the casing and filler were determined, as well as gas flow parameters in the channel. Within the conjugate problem, the engine is considered to be a two-component system: deformable solid body and gas. Conjugate problem solution involves specific subtasks related to the conjugation conditions, where Lagrangian approach is used for subtasks of solid body. Euler approach is used for subtasks of gas, implying immovable boundary of the computational domain on the integration time step. Numerical methods are applied in solving subtasks. Specific feature of conjugate problem solution algorithm is discrete movable domain boundary interface.
Taxonomy of uncertainty in environmental life cycle assessment of infrastructure projects
Authors: Saxe Shoshanna , Guven Gursans , Pereira Lucas , Arrigoni Alessandro , Opher Tamar , Roy Adrien , Arceo Aldrick , Von Raesfeld Sofia Sampedro , Duhamel Mel , McCabe Brenda , Panesar Daman K , MacLean Heather L , Posen I Daniel 
Published: April 2020

Abstract
Environmental life cycle assessment (LCA) is increasingly being used to evaluate infrastructure products and to inform their funding, design and construction. As such, recognition of study limitations and consideration of uncertainty are needed; however, most infrastructure LCAs still report deterministic values. Compared to other LCA subfields, infrastructure LCA has developed relatively recently and lags in adopting uncertainty analysis. This paper presents four broad categories of infrastructure LCA uncertainty. These contain 11 drivers focusing on differences between infrastructure and manufactured products. Identified categories and drivers are: application of ISO 14040/14044 standards (functional unit, reference flow, boundaries of analysis); spatiotemporal realities underlying physical construction (geography, local context, manufacturing time); nature of the construction industry (repetition of production, scale, and division of responsibilities); and characteristics of infrastructure projects (agglomeration of other products, and recurring embodied energy). Infrastructure products are typically large, one-off projects with no two being exactly alike in terms of form, function, temporal or spatial context. As a result, strong variability between products is the norm and much of the uncertainty is irreducible. Given the inability to make significant changes to an infrastructure project ex-post and the unique nature of infrastructure, ex-ante analysis is of particular importance. This paper articulates the key drivers of infrastructure specific LCA uncertainty laying the foundation for future refinement of uncertainty consideration for infrastructure. As LCA becomes an increasingly influential tool in decision making for infrastructure, uncertainty analysis must be standard practice, or we risk undermining the fundamental goal of reduced real-world negative environmental impacts.
Study of the Mechanical and Thermal Properties of PMMA/TiO2Nano Composite
Authors: Yaseen S. T. , Khaleel A. Sh. 
Published: April 2020

AbstractThis research investigates the effect of adding some reinforcing materials,including (nano and micro) titanium dioxide(TiO2)particles with different weight fraction(0.1,0.4,0.7,1,3 and5)% to polymethyl methacrylate (PMMA)and studying some mechanical and physical propertiesof composite material. Specimens’ of this project were prepared using (in-situ) method to form compositematerials. Themechanical tests were performed on these specimens,includingimpact test, thermal conductivity was performed as a physical test.Results of this study showed that the values of impact strength were decreased when adding the (nano-micro) particles in PMMA composite materials, while the values of thermal conductivity weredecreased.
Influence of Aluminum Fine Powder Content on the Some Mechanical Properties of Epoxy and Polyester Composites
Authors: Mohan Khadijh S , Awad Noor M , Hussein Wasan A , Farhan Ahmed J 
Published: April 2020

Abstract
In this study, the effect of aluminum powders on the some mechanical properties of epoxy (EP) and unsaturated polyester (UPE) composites was investigated. Aluminum powders (Al) were added to polymers with (0, 1, 3 and 5) %weight percentages. epoxy/Aluminum and unsaturated polyester/Aluminum composites were fabricated by the cast molding method. Maximum fracture forces, Maximum Extensions, Yield Points, Young Modulus, Tensile Strengths, flexural strength and ultimate compressive strength tests were performed on both composites. The results showed that the tensile strength of epoxy/Aluminum composites increased with increasing of additive percentage of Al powder, and the samples of EP/Al composite gained highest values of tensile strength (22.48 MPa) at ratio percent(5%). While the tensile strength of unsaturated polyester/Aluminum composites decreased with increasing of additive percentage of Al powder. Also the results showed that the samples of EP/Al composite gained highest values of flexural strength (58.63MPa) at weight percentage (1%).While the samples of UPE/Al composite gained highest values of flexural strength (91.88 MPa) at weight Percentage (3%). Finally, the value of compressive strength decreased with increasing of additive percentage of Al powder in both of EP/Al and UPE/Al composites.
Study The Improvement In The Dielectric Strength of (UPR/MgO) Nanocomposites
Authors: Zayza Malik J , Jubier Najwa J , Al –Bayaty Subhi A 
Published: April 2020

Abstract
This work focuses on the preparation of polymer matrix nanocomposite materials by hand lay-up molding which was prepared from the unsaturated polyester resin as matrix reinforced by nanoparticles of Magnesium Oxide(MgO) with particle size (54.19 nm) and weight fraction (0,1,3,5,7,10 and 15)%. Dielectric strength for the prepared samples was studied; the results of tests have shown the increase in the dielectric strength with increasing the weight fraction of additive (MgO) and also with the increases in the rate of voltage. The effect of the cycle’s number on the dielectric strength has noticed clearly after the first cycle.The images taken for the electric breakdown points by using optical microscopy has shown the sample coaled in the electric breakdown area as a result of polymeric chains of unsaturated polyester (UPR) destroyed, and there is an appearance of microcracks as a result of electric breakdown extends directly from the point of electric breakdown.
Evaluation of natural radioactivity in selected soil samples collected from northern regions of Oman
Authors: Al-Harmali A. 
Published: April 2020

Abstract
This study explores the radioactivity concentration in soil in the Northern regions of Oman. The naturally occurring radioactive nuclides of the main series, 238U, 232Th, 235U and 40K and artificial radionuclide 137Cs have been studied by means of low level gamma spectroscopy. Majority of the studied valleys (wadis) are descending from Super Hajar Mountains either towards its east part (coastal area) or the west part (desert). Soil samples were collected from headwaters and estuaries of wadis where residences and agriculture activities exist. In soil samples, the results showed that 238U radionuclide was presented in concentrations of the range (4.5 – 24.0) Bq.kg−1while 232Th was found in the range (2.4-20.6) Bq.kg−1. Ranges of 235U and 40K were reported as (0.6-2.5) Bq.kg−1 and (47-296) Bq.kg−1 respectively. Artificial radionuclide 137Cs was found in all soil samples in the range (2.8-11.9) Bq.kg−1. The hazard parameters, dose rate (D), annual effective dose (HR), equivalent radium activity (Raeq), internal hazard index (Hin), external hazard index (Hex) and gamma representative level index (Iγr) were all calculated. The values of D, HR and Raeq were found in the ranges (6.6-33.5) nGy/h, (0.8-4.1)*10−2 mSv/yr and (17.2-88.6) Bq.kg−1 respectively. The values of Hin, Hex and Iγr were all less than 1. These obtained results remained below the optimum admissible values according to UNSCEAR.. The results indicate that the radiation hazard from naturally and artificially radionuclides in soil samples from the area studied in this current work is not significant.
Radon concentration measurement in a groundwater in Al-Tuz, Salah Al-Din Governorate using nuclear track detector CN-85
Authors: Al-Mashhadani Asia H. , Ali Huda Saddi , Yas Rana M. , Ali Karar Sameen 
Published: April 2020

Abstract
This work aims to determine the radon concentration in different samples of groundwater in Al- Tuz, Salah Alden. The concentrations of radon were studied in 52 samples for different regions using CN-85 nuclear track detector. The results show that the concentration of radon gas in groundwater were ranged between the lowest value (0.727 Bq/L) in the modern morning well sample (w44) and the highest value (4.001 Bq/L) in the west of the district of Tuz well sample (w47) with an average (1.747). The results were found to be below the allowed limit of radon concentrations 222Rn (11.1 Bq/L). The mean annual dose of drinking water was ranged between the lowest value (2.619μSv/y) in sample W44 and the highest value (14.45 μ Sv/y) in the sample W47 with an average (6.292 μ Sv/y). All annual doses of drinking water values in this work were lower than the allowed limit (22.024 μ Sv/y).
Investigation of the Reaction Cross-Section for Production the Radioactive Isotopes Used in Fabricating The Nuclear Batteries
Authors: Latooffi Nabeel F. , Alzubadi Ali A. 
Published: April 2020

Abstract
Beta-decay radioactive isotopes have been widely used as a high-energy source in nuclear batteries. The aim of this study is to improve the evaluations of nuclear reactions for the production of some radionuclides with possible use in nuclear batteries. In particular, the 38Ar(n,γ)39Ar, 59Co(n,γ)60Co, 112Cd(n,γ)113mCd, 151Eu(n,γ)152Eu, 153Eu(n,γ) 154Eu, 193Os(n,γ) 194Os and 203Tl(n,γ) 204Tl neutron capture reactions have been studied for an incident neutron energy range from 10-6 eV up to 2 MeV. The evaluations of the capture cross sections are based on the nuclear model calculations with the latest release code EMPIRE-3.2.2 (Malta) and compared with the available experimental ones. The TENDL nuclear data library, which provides the output of TALYS nuclear model code system have been also presented along with the extracted data for some interactions with no experimental support. Simulation of the beta particles transportation and the generated bremsstrahlung intensity through silicon carbide semiconductor has been also investigated.
Investigation of The Thermal Conductivity of Binary Polymer Blends
Authors: Farhan Ahmed J , Jaffer Harith I 
Published: April 2020

Abstract
In this research, binary polymer blends are formed from epoxy, unsaturated polyester and polyurethane. The concentration were chosen with varying percentages of components, resulting in three groups; polyurethane / epoxy (PU/EP), epoxy/unsaturated polyester (EP/UPE) and polyurethane/unsaturated polyester (PU/UPE) blends. Hand lay-up technique was used to prepare the samples with 6 mm thickness prepared from simultaneous mixing of the two constituents in the required percentages.
Thermal conductivity K for these blends was carried out by using Lee’s disk method at room temperature. The experimental results showed that an increment and/or decrement of thermal conductivity depend on type and blend concentration. Also the experimental results indicated that the thermal conductivity has the highest values of (K) (0.78 J/m2.k) at ratios (PU 10% / EP 90 %), (0.70 J/m2.k) at ratios (EP 50% / UPE 50%) and (0.50 J/m2.k) at ratios (PU 40% / UPE 60%) respectively. This increment of (K) implies that the penetration of molecules of both polymer components in the same direct then a good transfer of energy by the vibration and rotation of the chain molecules.
Also the experimental results indicated that the thermal conductivity has the lowest value of (K) (0.52 J/m2.k) at ratios (PU 40% / EP 60%), (0. 0.53 J/m2.k) has obtained at ratios (EP 30% / UPE 70%) and (0. 0.31 J/m2.k) has obtained at ratios (PU 60% / UPE 40%) respectively.
Sustainable manufacturing process applied to produce magnesium oxide from sea water
Authors: Jassim A K , Salmtori S A , Jassam J A 
Published: April 2020

Abstract
Magnesium oxide is one of the most important materials that used to produce a basic refractory material which is applied for liningsteel and iron furnaces as well as cement furnaces. In this research, magnesium oxide was produced from sea water that content effective percentage of magnesium hydroxide instead of magnesium carbonate rock. The process has been done by adding additive materials which include high alumina, iron oxide, sodium phosphate and sodium silicate to reduce the sintering temperature to 1400 °C instead of 1750 °C. Moreover, kiln furnace was used instead of rotary furnace to do the sintering process. The results show that there is a possibility to produce magnesium oxide with purity of 56%. It is stable at temperature less than 1600 °C and resists the humidity and water. The process of producing magnesium oxide could be considered as a sustainable manufacturing process due to the applied lower sintering temperature which leads to reduce cost, energy and pollution.
Prepare Maps For Greenhouse Gases With Some Weather Elements For Baghdad City Using Data Observation And Arc-GIS Techniques
Authors: Khanjer Ebtesam F. , Awad Lina , Hassan Wassan A. , Ismael Ban S. 
Published: April 2020

Abstract
Air pollution refers to the release of pollutants into the air that are detrimental to human health and the planet as a whole.In this research, the air pollutants concentration measurements such as Total Suspended Particles(TSP), Carbon Monoxides(CO),Carbon Dioxide (CO2) and meteorological parameters including temperature (T), relative humidity (RH) and wind speed & direction were conducted in Baghdad city by several stations measuring numbered (22) stations located in different regions, and were classified into (industrial, commercial and residential) stations. Using Arc-GIS program ( spatial Analyses), different maps have been prepared for the distribution of different pollutant concentrations of the city of Baghdad. These maps indicate where the highest and lowest concentrations are based on the color gradient of the map.
Study of Some Factors That Affect ECG Device
Authors: Tafash Haitham T. , Ali Ahmed H. , mohammed Maath , Salman Mohammed D. , Ali Abdul Aziz , Maher Asmaa , Yaseen Teba , saade Safa , sabar Manar , Mohammed Abdullah , Jasim Hend , Huthaifa Sarah 
Published: April 2020

Abstract
Changes are studied that appear on the electrocardiogram due to the effect of electromagnetic waves emitting by mobile devices. The research was carried out at Fallujah Teaching Hospital by using a MAC1600-Morta ECG device. The work included a study on the effect of the presence of mobile devices during the measurement of electrocardiograms and the discussion of all cases, as well as the impact of the ordinary watch near the electrodes. The results showed a disturbance in the electric waves and return wave will return to its normal shape after the demise of the effect.
Electrochemical evaluation of polyaniline/multi-walled carbon nanotube composite synthesized by microwave plasma polymerization as a supercapacitor electrode
Authors: Ibrahim Nada I , Wasfi Ahmed S 
Published: April 2020

AbstractPANI/MWCNT nanocomposite supercapacitor electrodes were synthesized by in-situ microwave plasma polymerization of aniline in the presence of MWCNT-COOH. The SEM image of the composite illustrates the formation of the core-shell MWCNT-PANI ordered structure that has a strong effect on the electrical conductivity and porosity, in addition to the appearance of agglomerated polymerized islands. The electrochemical performance of PANI/MWCNT composite was evaluated with respects to the obtained specific capacitance, energy and power density, and cyclic stability, using cyclic voltammetry, galvanostatic charge/discharge at a constant current and electrochemical impedance spectroscopy. The highest obtained specific capacitance was 112 F/g at a charging current density of 1.6 A/g, provides the highest energy density of 34.8 Wh/Kg and a power density of 1670 W/Kg. While the highest achieved power density was 8381 W/Kg with an energy density of 12.8 Wh/Kg. The delivered energy density crossed the threshold energy density limit of the battery, which meets the scientific motivation to use supercapacitor as an independent energy source.
Hybrid SOLAR / DIESEL Low Power Generation Performance System for Local House in Baghdad City
Authors: Allw Ali S. , Mustafa Falah I. 
Published: April 2020

Abstract
The national electrical energy situation report study today in Iraq represents that the value of the conventional electrical energy power is increasing day after day with increasing more demand on the electricity source in all sectors of life in Iraq. To avoid energy supply shortage, today should be using renewable energy sources with rise required management. A hybrid electrical energy system usually consists of two or more renewable energy sources used together with conventional electrical energy sources to extend increased system efficiency, but the design of hybrid power involves uneconomic and excessive capacities results in excess electric generation with increasing the initial costs. In this study, we find the optimization the best time required of sharing alternative between both of solar-diesel generator hybrid power system for 24 hours. The PV peak power was 1.3kW and diesel power 2.4kW with using both of theoretical calculation. The HOMER software was used to improve a simulation model for one day in Baghdad city in Iraq. The HOMER software is used to implement the optimization. The master objective is to optimize hybrid system component sizes, minimizing excess electricity generation, and set electric load and implement cost analysis based on life cycle price. Inputs data used for simulation consist of real solar radiation data (Averaged to monthly values), taken from the local weather station installed at Baghdad city. Based on maximum load, hybrid system parameters sizes considered and many simulation results are acquired.