Physics Commons^™

Effects Of Ti Addition On The Characteristics Of Al-10zn-6mg-2si/Zro2 Composites Produced By Squeeze Casting, Qesha Diva Prameshvara, Pipin Indah Lestari, Bondan Tiara Sofyan

Journal of Materials Exploration and Findings

Metal matrix composite (MMC) with 7xxx aluminum matrix is potential for ballistic applications due to the combination of strength, toughness, and light weight. Previous study successfully produced aluminum-based composites with SiC particles which were able to stop type III bullet, however cracks remained on back of the plate. Therefore, in this research, SiC was replaced by zirconia (ZrO₂) due to its high fracture toughness. Ti-B grain refiner was added to further improve toughness through grain boundary strengthening mechanism. This research developed 5 vol.% ZrO₂ strengthened Al-10Zn-6Mg-2Si composite with addition of Al-5Ti-1B grain refiner produced through squeeze casting …

Integration Of The Ashby Technique And Pahl-Beitz Quantitative Ranking For Railway Axle Material Selection, Helya Chafshoh Nafisah, Jaka Fajar Fatriansyah, Siti Norasmah Surip

Journal of Materials Exploration and Findings

Railway axle serves as a vital connection between the train's wheels and its body. However, cyclic loading and high speed can induce fatigue in railway axle, which potentially leads to damage human safety. Therefore, it is important to find materials that have good mechanical properties with the lowest weight and cost. In this paper, a comprehensive method using Ashby chart has been performed to select candidate materials of railway axle. The methods begin with analyzing function by determining the problem, objective function, and constraints. After that, the results obtained are ranked using Pahl and Beitz quantitative weighting method. The results …

Analysis Of The Effect Of Different Surface Preparation Methods On Corrosion Resistance And Adhesion Strength Of Astm A36 Steel Substrate With Surface Tolerant Epoxy Paint As Coating Material, Irwan Wijaya Santoso, Daffa Aqila, Rini Riastuti, Rizal Tresna Ramadhani

Journal of Materials Exploration and Findings

In the industrial world, to extend the service life of materials, protection methods are carried out to slow down the material's corrosion rate. The protection method that is often used is the coating method. The coating method is a protection method by coating the substrate material using a coating material to prevent contact between the substrate material and the environment. In this research, the substrate material used is ASTM A36 steel and the coating material used is Surface Tolerant Epoxy paint. The independent variable used in this study lies in the surface preparation method which consists of: solvent cleaning, hand …

Surface Treatments' Effects On The Capacitor's Dielectric Performance Under Electro-Thermal Stresses, Haider. M. Umran, Feipeng Wang

Karbala International Journal of Modern Science

Biaxial-oriented polypropylene (BOPP) films are characterized by unfavorable aging behavior because of their poor susceptibility to high temperatures, humidity, and high electric fields. This makes them unqualified to withstand harsh operating conditions, such as in capacitor applications. This study investigates the impact of annealing BOPP samples at 100 °C for five hours after fluorination at different times (15, 30, and 60 minutes) on their electrical and mechanical performance under electro-thermal stresses. Scanning electron microscope (SEM) images confirm that there is an increase in surface roughness and the formation of a dense layer of fluorine-containing groups monotonically with fluorination time. So, …

Advancements In Characterization Of Ancient Potteries From Southeast Asia: A Review Of Analytical Techniques, Chitnarong Sirisathitkul

Makara Journal of Science

Ancient potteries offer valuable information regarding technological advancements, life dynamics, cultural diversity, and trade routes in the past. Earthenware, stoneware, and porcelain from Southeast Asia have been characterized using several analytical techniques, as reviewed in this article. Fluorescent and diffracted X-rays give rise to elemental and phase compositions, respectively. Examination of molecular bonds requires vibrational spectroscopy, which is useful for the identification of organic materials in ancient potteries. With the advent of portable X-ray fluorescence and Raman spectrometry, on-site analysis of archeological ceramics is now possible. For in-depth analysis, synchrotron light sources can provide new insights into artifacts through X-ray …

High Energy Approximation For Monte Carlo Event Generator, A. N. Ismailova, Yu. L. Parfenova, P. G. Sharov, D. M. Janseitov

Eurasian Journal of Physics and Functional Materials

Analysis of the nuclear physics experiment often requires Monte Carlo simulation of the detector setup. Such kind of simulations often requires a quite advanced model of nuclear interaction. In this work we describe application of Monte Carlo simulation in the nuclear physic experiment, and discuss on example of elastic scattering how to apply well known High Energy Approximation (or Glauber model) to Monte Carlo simulation of the experimental setup.

Determination Of Phase Boundaries And Diffusion Coefficients Of Copper In Spinel Cucr2se4 And Delafossite Cucrse2 By Galvanostatic Intermittent Titration Technique (Gitt), A. O. Onishenko, E. A. Suslov, M. S. Postnikov, A. S. Shkvarin, A. N. Titov, A. I. Merentsov

Eurasian Journal of Physics and Functional Materials

Cux CrSe2 materials can exist in the form of delafossite with a layered structure and exhibit multiferroic properties, or in the form of spinel and exhibit ferromagnetic properties, depending on the copper concentration. The stability of both forms of Cux CrSe2 has been studied with regards to defectivity in the copper sublattice. The boundaries of the Cux CrSe2 homogeneity regions for the delafossite- like structure and for the cubic spinel CuCr2Se4 were determined by coulometric titration at room temperature. Analysis of the time dependence of cell polarization allowed us to estimate the diffusion coefficients in these materials

Concentration Polarization And Ionic Conductivity Of Nanocomposite Thermoelectric Materials K0.01cu1.94s, K0.02cu1.94s, K0.03cu1.94s, M. M. Kubenova, M. Kh. Balapanov, K. A. Kuterbekov, B. Akhmetgaliev, R. Kh. Ishembetov, R. F. Almukhametov, M. Zeleev, A. M. Kabyshev, K. Zh. Bekmyrza, R. Alina, R. E. Kondakirov, M. K. Kenzhebek

Eurasian Journal of Physics and Functional Materials

The paper presents experimental results of concentration polarization and ionic conductivity of nanocom- posite thermoelectric materials K0.01Cu1.94S , K0.02Cu1.94S , K0.03Cu1.94S . According to X-ray phase analysis, the synthesized samples are monoclinic jarleite Cu1.93÷1.97S with an admixture of oxygen ox- ide Cu2S and monoclinic chalcocyte. High values of total ionic conductivity are observed, ranging from 0.86 to 1.5 Cm/cm. The lowest ionic conductivity (0.86 Cm/cm at 355 ◦ C) is observed for alloy K0.02Cu1.94S . In addition, it was found that with an increase in the concentration of potassium in the studied materials, ionic conductivity tends to decrease, activation energy …

Study Of The Effect Of Combined Reinforcement And Modification Of Epoxy Resin With Rubbers On The Impact Strength Of Carbon Fiber-Reinforced Plastic, M. N. Meiirbekov, M. B. Ismailov, A. K. Kenzhegulov, L. M. Mustafa, I. B. Tashmukhanbetova

Eurasian Journal of Physics and Functional Materials

The effect of modified epoxy resin with polyurethane, silicone, and butadiene rubber and combined reinforcement with fiberglass and Kevlar on the strength properties of carbon fiber-reinforced plastic was studied. It was found that when rubber is introduced into the composition of the epoxy resin, polyurethane, and combined reinforcement according to the carbon fiber/Kevlar scheme in a ratio of 10:10 leads to an increase in impact strength by 42% to 273 kJ/m2 and compressive strength increases by 35% to 575 MPa

Luminescence And Creation Of Electron-Hole Trapping Centers In Alkali Metal Sulfates Activated By Pb2+ Impurity, T. N. Nurakhmetov, R. K. Shamieva, Zh. M. Salikhodzha, N. I. Temirkulova, T. T. Alibay, B. M. Sadykova, B. N. Yussupbekova, A. A. Kabdulkak

Eurasian Journal of Physics and Functional Materials

The nature of the impurity emission and the process of creating intrinsic and impurity electron-hole trapping centers were studied by spectroscopic and thermal activation methods in Na2SO4 - Pb and K2SO4 - Pb phosphors. The combined radiative electronic state is formed from intrinsic SO3− 4 - SO− 4 and impurity Pb+ - SO− 4 electron-hole trapping centers in UV-irradiated phosphors with a photon en- ergy of 6.2 eV at 80 K. Emissions of 3.2 eV and 3.6 eV resulting from irradiation with photons with an energy of 6.2 eV are associated with intracenter transitions of 3p1 - 1s0 in Pb2+ …

Reducing Food Scarcity: The Benefits Of Urban Farming, S.A. Claudell, Emilio Mejia

Journal of Nonprofit Innovation

Urban farming can enhance the lives of communities and help reduce food scarcity. This paper presents a conceptual prototype of an efficient urban farming community that can be scaled for a single apartment building or an entire community across all global geoeconomics regions, including densely populated cities and rural, developing towns and communities. When deployed in coordination with smart crop choices, local farm support, and efficient transportation then the result isn’t just sustainability, but also increasing fresh produce accessibility, optimizing nutritional value, eliminating the use of ‘forever chemicals’, reducing transportation costs, and fostering global environmental benefits.

Imagine Doris, who is …

Combined Risk Based Inspection And Fault Tree Analysis For Repetitive 3-Phase Line Piping Leakage At West Java Offshore Topside Facility, Dona Yuliati, Akhmad Herman Yuwono, Datu Rizal Asral, Donanta Dhaneswara

Journal of Materials Exploration and Findings

Hydrocarbon releases might result in serious consequences in various aspects. In addition to the contribution to environmental pollution, repetitive leakages need high repair costs. This study aim is to minimize potential repetitive leakage for other typical 3-phase piping systems. We conducted the risk assessment by adopting Risk Based Inspection (RBI) API 581 to identify risk level, calculating piping lifetime, recommended inspection plan and mitigations. The most relevant root causes can be obtained through quantitative Fault Tree Analysis (FTA). Observation and investigation was taken from eight 3-phase piping systems that experienced repetitive leakages. It has been found that the risk level …

Nitrogen Gas Quenching Pressure Effect On Bs S155 Alloy Steel In Vacuum Furnace, Agus Mulyadi Hasanudin, Eddy Sumarno Siradj

Journal of Materials Exploration and Findings

The production of metal and alloy products requires the use of heat treatment, when during the heat treatment process, quenching is a crucial step. The quenching medium can be anything from water, a salt bath, oil, air and gas. In a vacuum furnace, pressurized gas, most frequently nitrogen (N₂) gas, serves as one of the quenching mediums. One of the drawbacks of the quenching process is the distortion and dimensional change of the parts. This paper aims to investigate the influence of nitrogen gas quenching pressure on the distortion and dimensional change of aerospace actuator gear planet parts …

Stability Of Non-Centrosymmetric Phases In Tetra-Coordinated Of Ldtm Intercalates, A. S. Shkvarin, M.S. Postnikov, S. V. Pryanichnikov, A. N. Titov

Eurasian Journal of Physics and Functional Materials

On the basis of comparison of temperature dependences of lattice parameters of CuCrSe₂ and Cu_0.5ZrSe₂ in the temperature region including transition between phases with centrosymmetric and noncentrosymmetric distribution of copper on positions tetrahedrally coordinated by selenium. It is concluded that the critical factor that ensures the stability of the non- centrosymmetric copper distribution is the covalent interaction between copper and selenium sublattices. This effect is not related to the anisotropy of the elastic constants of the lattice and can be observed in other layered structures with copper tetrahedrally coordinated by chalcogen.

Production Of Zno Thin Films Used In Solar Cell With A Sol-Gel Homemade Dip Coater Technique And Investigated Of Their Structural, Morphological And Optical Properties, Z. Gã¼Ltekin, C. Akay, N. A. Gã¼Ltekin, M. Alper

Eurasian Journal of Physics and Functional Materials

We designed a homemade dip coater controlled by an Arduino microcontroller to produce semiconductor metal oxide films such as ZnO, CoO, and NiO. The developed device was successfully used to deposit ZnO film on a glass substrate. The structural, surface, and optical properties of the film were investigated. XRD patterns showed that the film is predominantly a hexagonal wurtzite crystalline structure. Scanning electron microscopy (SEM) images showed that the ZnO film was uniformly and homogeneously coated on the glass substrate. EDX analysis confirmed the presence of Zn and O in the film structure. Optical characterization by UV-visible spectrometry showed that …

Scanning Tunneling Spectroscopy Of Homooligonucleotides, T. Sharipov, R. Garafutdinov, A. Mishra, S. Santer, R. Shaikhitdinov, M. Balapanov, R. Bakhtizin

Eurasian Journal of Physics and Functional Materials

Short single-stranded DNA molecules of two types, consisting of dC nucleotides only or dA nucleotides only, were immobilized onto the surface of mica and silver substrates and studied by scanning probe microscopy methods. Geometric dimensions of the studied objects were determined. The currentvoltage curves of d(A)12 and d(C)12 oligonucleotides were measured. Their differential electrical resistances were estimated and compared with each other.

Characterization And Luminescence Dynamics Of Mgf2:W Ceramics, A.V. Strelkova, V. M. Lisitsyn, L. A. Lisitsyna, T.A. Koketai, D. A. Mussakhanov, Zh.T. Karipbayev, A. M. Zhunusbekov

Eurasian Journal of Physics and Functional Materials

This study delves into the synthesis and characterization of luminescent ceramics based on tungstenactivated magnesium fluoride (MgF₂) complemented with varying concentrations of lithium hydroxide (LiOH). Utilizing a distinctive sintering process conducted in an open-air milieu under robust radiation conditions, we successfully synthesized a series of tungsten-activated ceramics. Study revealed that the resultant ceramics prominently display luminescent properties, which can be excited by UV radiation in the spectrum of 200-300 nm, as well as by high-energy electron fluxes. The spectral characteristics of these ceramics, in terms of band position, half-width, and excitation spectra, are strikingly analogous to those observed …

Study Of The Dependence Of The Degree Of Disordering Of The Surface Layers Of Si(111) And Ge(111) Single Crystals Upon Bombardment With Low-Energy Ions, B. E. Umirzakov, I. R. Bekpulatov, G. T. Imanova, I. Kh. Turapov, J. M. Jumaev

Eurasian Journal of Physics and Functional Materials

In the presented article, samples were studied using Auger electron spectroscopy, recording the angular dependences of the coefficient of elastically reflected electrons h, and spectroscopy of elastically reflected electrons. A change in the composition and degree of disorder of the surface layers of Si (111) was detected when bombarded with Ar⁺ and K⁺ ions with a change in energy E₀ ∼ from 1 to 10 keV and ion dose from ∼ 10¹³ to 1017 cm⁻². It was found that although the Ar and K atoms have the same masses, at the same ion energies, …

Effect Of Electron Irradiation On Mechanical, Tribological And Thermal Properties Of Polytetrafluoroethylene, K. D. Ormanbekov, B. K. Rakhadilov, A. Zh. Zhassulan, N. E. Mukhamedov, A. B. Shynarbek, N. M. Magazov

Eurasian Journal of Physics and Functional Materials

The article presents the study results of the electron irradiation effect on the mechanical, tribological and thermal properties of polytetrafluoroethylene (PTFE). The results allow a better understanding of the processes occurring in the structure of PTFE under irradiation and reveal potential applications of the modified material with improved tribological characteristics, high thermal resistance and mechanical strength. In this work the samples were tested for wear resistance and thermal stability. It was found that the effect of electron irradiation leads to a significant increase in the microhardness of the material by 1.5 times compared to the initial state. However, degradation of …

Phase Transitions In Copper Tellurides, N. N. Bikkulova, A. Kh. Kutov, G. R. Akmanova, A. R. Kurbangulov, D. I. Safargaliev, L. V. Tsygankova

Eurasian Journal of Physics and Functional Materials

This paper presents the results of model calculations of the structure of the Cu-Te system at low temperatures, as well as the results of a study of the structure and phase transitions of synthesized non-stoichiometric compounds of copper tellurides. For the first time, using the USPEX evolutionary algorithm, model computer calculations of the search for stable phases of copper tellurides Cu n Te m (n,m = 1÷10) were carried out. At temperature T = 0 K and pressure p = 1 atm. As stable structures, the compositions Cu₅Te₄, Cu₃Te₂, and Cu_{7 …}

The Quality Assessment Of The Mpd New Inner Tracker Based On Thin Silicon Pixel Sensors With Large Area, V. I. Zherebchevsky, V. P. Kondratiev, N. A. Maltsev, Yu. A. Murin, V. V. Petrov

Eurasian Journal of Physics and Functional Materials

Today one of the important problems of elementary particle and high energy physics is the study of strongly interacting matter under extreme conditions. In experiments with relativistic heavy ion reactions, a new phase of matter: quark-gluon plasma is being studied. It make possible to shed the light on the first seconds of the Universe existence, as well as to quantitatively describe the processes of neutron star merger. Ultra-high density nuclear matter states could be investigated in the collisions of heavy nuclei at energy range 4 - 11 GeV by studying of the particles yields which contained charm quarks in the …

Computational Scheme For Breakup Of 11be On Light Targets, D. S. Valiolda, D. M. Janseitov, V.S. Melezhik

Eurasian Journal of Physics and Functional Materials

We investigate the Coulomb breakup of the ¹¹Be halo nuclei on a light (carbon) target within nonperturbative
time-dependent approach including the low-lying resonance 5/2⁺ of ¹¹Be (E= 1.232 MeV). We had found considerable contribution of the low-lying resonances ( 5/2⁺ , 3/2⁻ and 3/2⁺ ) to the breakup cross section of ¹¹Be on a heavy (²⁰⁸Pb) target at our previous calculations. The developed computational scheme is extended to study the breakup of ¹¹Be on a light target. This work is the initial step, where the convergence and accuracy of the …

Compact And Sustainable Electronic Module For Silicon Photodetectors, A. Sadigov, S. Nuruyev, R. Akbarov, D. B. Berikov, A. Madadzada, A. Mammadli, S. Lyubchyk, E. Yilmaz

Eurasian Journal of Physics and Functional Materials

This article presents the development of a cost-effective and efficient electronic module for silicon photodetectors (SiPM). The electronic module combines essential functionalities, such as a high voltage power supply, a preamplifier, and a signal comparator, into a compact circuit. A high voltage power supply with a range of 30 to 140 V provides a stable bias voltage with 0.01 V accuracy, while a preamplifier with 40 gain and 250 MHz bandwidth enables signal amplification necessary to extract weak signals. The comparator converts an analogue signal (higher than 8 mV) into TTL (transistor-transistor logic), which makes it easy to process and …

Selection Of An Internal Standard To Determine Mass Concentration Of Uranium In Human Urine By Inductively Coupled Plasma Mass-Spectrometry, V. V. Kolbin, M. T. Dyuisembaeva, N. Zh. Mukhamediyarov, A. Zh. Tashekova, G. M. Yesilkanov, Ye. Z. Shakenov, A.Ye. Temirzhanova

Eurasian Journal of Physics and Functional Materials

The paper presents experimental studies on the choice of an internal standard in order to correction the matrix effect that occurs when determining uranium in human urine by inductively coupled plasma mass spectrometry. Monoelemental standard solutions of Sc-45, Rh-103, In-115, Ir-193, Th-232 were used as internal standards. The levels of the decrease in the sensitivity of analytical signals of internal standards and uranium spikes under the influence of the matrix effect were determined. The ratio of the measured concentration of internal standards in the background solution of 5% nitric acid and in the matrix of the urine simulator was found …

Thermal Conductivity Of New Nanocomposite Superionic Semiconductors K0.01cu1.96s, K0.02cu1.95s, K0.03cu1.94s, K0.04cu1.93s, K0.05cu1.94s, M. M. Kubenova, M. Kh. Balapanov, R. Kh. Ishembetov, K. A. Kuterbekov, R. F. Almukhametov, K. Zh. Bekmyrza, A. M. Kabyshev, R. Sh. Palymbetov, L. U. Taimuratova

Eurasian Journal of Physics and Functional Materials

In this work, we investigated the effect of nanostructuring on the thermoelectric and thermal properties of nonstoichiometric solid splavs doped with copper sulfides with potassium. The synthesized alloys K_0.01Cu_1.96S, K_0.02Cu_1.95S, K_0.03Cu_1.94S, K_0.04Cu_1.93S, K_0.05Cu_1.94S are nanocomposite. The crystallite sizes of the synthesized powder, as estimated from the half-width of X-ray diffraction lines, range from 7 to 180 nm. Sample K_0.01Cu_1.96S is a mixture of phases consisting of chalcocite Cu₂S (82%), jarleite Cu_1.96S (12%), …

Deformation-Stimulated Luminescence Of A Kbr Crystal Matrix, K. Shunkeyev, A. Tilep, Sh. Sagimbayeva, Zh. Ubaev

Eurasian Journal of Physics and Functional Materials

Radiative relaxations of electronic excitations - self-trapped excitons (STE) in regular lattice sites (intrinsic luminescence) and exciton-like formations (ELF) in the field of homologous cations (exciton-like luminescence). It has been found that the maximum effect of luminescence enhancement occurs upon uniaxial deformation along the <110> crystallographic direction (compared to <100>), which coincides with the direction of the self-trapped anion exciton (<110>) in the KBr crystal matrix. The exciton mechanism was estimated from the increase in the intensity of the intrinsic s(4, 42eV) - and p(2, 3eV) - luminescences of STE, and the enhancement of luminescence intensity of near-single Na^{+ …}

62nd Annual Rocky Mountain Conference On Magnetic Resonance

Rocky Mountain Conference on Magnetic Resonance

Final program, abstracts, and information about the 62nd annual meeting of the Rocky Mountain Conference on Magnetic Resonance, co-endorsed by the Colorado Section of the American Chemical Society and the Society for Applied Spectroscopy. Held in Sonesta Denver Downtown, Denver, Colorado, July 23-27, 2023.

Influence Of Surfactants On The Formation And Growth Of Cadmium Telluride Nanoplatelets, A.S. Akhmetova, A.K. Ospanova, B.N. Yussupbekova, T.T. Alibay

Eurasian Journal of Physics and Functional Materials

The article presents a comprehensive review of the current research on the use of surfactants in CdTe nanoplatelet synthesis, including a discussion of the various types of surfactants that have been used and their effects on nanoplatelet size, shape, and optical properties. Additionally, the article examines the mechanisms by which surfactants influence the growth and morphology of CdTe nanoplatelets, with a focus on the role of surfactant, size, and structure. Overall, this article provides a detailed analysis of the use of surfactants in the synthesis of CdTe nanoplatelets and highlights the potential for this approach to improve the performance of …

Electron-Hole Trapping Centers In Alkali Metal Sulfates With Dy3+ Impurities, T.N. Nurakhmetov, T.T. Alibay, R.Z. Bakhtizin, S. Pazylbek, A.Zh. Kainarbay, A.M. Zhunusbekov, B.M. Sadykova, D.A. Tolekov, R.K. Shamieva, A.S. Nurpeissov

Eurasian Journal of Physics and Functional Materials

The Na₂SO₄ − Dy samples were obtained by slow evaporation method. The spectroscopic methods were used to study the mechanisms of formation of electron and hole trapping centers. Intrinsic recombination emission of 2.9–3.1 eV and impurity emission of 2.55 eV and 2.15 eV are excited at 4.0–4.5 eV. Intrinsic SO³⁻₄− SO⁻₄ and impurity Dy²⁺−SO⁻₄ trapping centers were revealed. The local levels corresponding between the electron and hole trapping center are 4.0–4.5 eV.

Research On Ferroelectric-Piezoelectric Properties And Relaxor Phase Transition Characteristics Of Pslzt-Bmt Ceramics, N.V. Thinh, L.D. Vuong, D.V. On, T.V. Chuong, L.V. Truong Son, T.N. Dat, L.V. Thanh Son, V.T. Tung

Eurasian Journal of Physics and Functional Materials

(1-x)[(Pb_0.94Sr_0.05La_0.01)(Zr_0.54Ti_0.46)_0.9975O₃]-x[Bi(Mn _1/2 Ti_1/2 )O₃] ceramics with x in the range of 0–0.05 mol were successfully synthesized following the conventional solid-phase route. The materials were thoroughly investigated to study their structural phase, microstructure, ferro-piezoelectric characteristics, and dielectric behavior. The addition of BMT to PSLZT contributed to the transition of the tetragonal phase to the rhombohedral phase and an increase in the mechanical quality coefficient Qm of the material. The value of the electromechanical coupling coefficient k_p =0.66, the value of k_t=0.53, …