bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of laser radiation on carbon nanotubes for the formation of frame materials in bioelectronics
Authors: Yu Gerasimenko A 
Published: February 2021

Abstract
Single-walled carbon nanotubes (SWCNT) nanoframes have been created in the form of structured films on a silicon substrate as well as in the bulk of biopolymers of albumin, collagen, and chitosan. Biopolymers were required to create multilayer, electrically conductive bioelectronic structures for reconstructing the layers of the heart. For this, a laser setup was used based on a pulsed fiber ytterbium laser with a wavelength of 1064 nm and a scanning system. Liquid dispersions of SWCNT in ethanol and aqueous dispersions of biopolymers were applied onto a substrate by layer spraying. Then they were irradiated with laser radiation. The effect of the binding of SWCNTs and their bundles to each other under the action of laser radiation on a silicon substrate is demonstrated. Using SEM and TEM, the formation of “T”, “X” and “Y” shaped joints in films is demonstrated. The mechanical characteristics of structured films by laser have improved. The hardness of films with nanoframe after laser exposure increases more than 6 times compared to the original SWCNT film. The specific electrical conductivity of films with nanoframe after laser exposure increases more than 7 times. The specific electrical conductivity of nanoframe in biopolymer matrices varies in the range 0.6 - 12.4 S/m, depending on the type of biopolymer. These values exceed electrical conductivity of heart myocardium. The highest roughness is shown for the lower layer of chitosan and SWCNT, and the smallest for the upper layer of albumin and SWCNT of the bioelectronic structure. Using confocal microscopy, the possibility of the formation of a cellular structure under the action of laser radiation on an aqueous biopolymer dispersion of SWCNT has been demonstrated. The cellular structure, electrical conductivity and nanoframe from SWCNT promoted better vital functions of heart cells - cardiomyocytes.
Low-temperature processing of Ti-Ni shape memory alloy by E.C.A.P. in shells
Authors: Karelin R D , Yu Khmelevskaya I , Komarov V S , Kosyachkova T R , Andreev V A , Perkas M M , Yusupov V S , Prokoshkin S D 
Published: February 2021

Abstract
The possibility of Ti-50.1 at.% Ni SMA processing by the equal-channel angular pressing (ECAP) in core-shell mode at low deformation temperatures was studied in the present work. The ECAP was performed in steel and iron shells in a temperature range from room temperature to 350 °C. Ti-Ni samples with a diameter of 12 mm were successfully subjected to ECAP for one pass at 200 °C in iron shell with a diameter of 20 mm. Lowering of the deformation temperature both to the 100 °C and to the room temperature leads to the samples distraction during the first ECAP pass. Significant deformation hardening of the sample after one pass of the ECAP in core-shell mode at 200 °C is observed. Increase of the structure defectiveness confirmed by the noticeable broadening of forward (from 26 to 103 °C) and reverse (from 20 to 46 °C) martensitic transformations hysteresis. Values of hardness, dislocation yield stress, and ultimate tensile strength after one pass of the ECAP in core-shell mode at 200 °C equals respectively, 275 HV, 1045 and 1200 MPa, that is noticeably higher than the same properties after reference treatment (annealing at 750 °C, 30 min): 176 HV, 520 and 945 MPa.
Production of porous films of silicate glass using a plasma focus setup
Authors: Kolokoltsev V N , Borovitskaya I V , Ya Nikulin V , Silin P V 
Published: February 2021

Abstract
The aim of the work was to obtain and study films of porous silicate glass. The proposed method for producing porous films is based on the rapid cooling of the melt on the surface of a glass plate after exposure to short pulses of argon plasma generated on an electrodischarge installation of plasma focus type. Silicate glass films obtained by such method have the properties of both porous glasses and foam glass. The specific volume density of these films is ∼ 0.4 g/cm3, their porosity and hygroscopicity correspondingly ∼ 0.3 and ∼ 30%
Hydride technologies in porous metals production
Authors: Kuznetsov A A , Anfilov N V , Berezhko P G , Yaroshenko V V , Yu Postnikov A , Tsarev M V , Mokrushin V V , Kremzukov I K , Ivanov D G , Zabavin E V , Sisyaev A V , Polovinkin P E , Simanov V A , Solomonov A V , Tsareva I A , Malkov I L 
Published: February 2021

Abstract
The experience of RFNC–VNIIEF in application of hydride technologies in porous metals production is presented. Using metal hydrides as pore-forming agents for foaming of metal melts, as raw materials for obtaining porous samples by sintering of powder compacts and as intermediate products in processes of hydride grinding of metals for further sintering of compacts are considered.
Effect of particle size distribution on the structure and mechanical properties in the process of laser powder bed fusion
Authors: Kuznetsov P A , Shakirov I V , Zukov A S , Bobyr’ V V , Starytsin M V 
Published: February 2021

Abstract
The paper studies effects of particle size distribution on the structure and mechanical properties of monolithic samples obtained by L-PBF. A powder of 321 austenitic stainless steel of one batch was divided into three fractions 0–20, 20–40, and 0–40 μm. It was established that for narrow fractional powder composition, hardness anisotropy is observed that depends on the building direction, whereas for wide fractional powder composition, hardness anisotropy is practically absent. It was found that the particle size composition of AISI 321 steel powder does not fundamentally affect the morphology of the grain structure. Despite the general preferred orientation of the {101} planes, a weak effect of the powder composition on the crystallites orientation is observed.
Binderless tungsten carbides with an increased oxygen content obtained by spark plasma sintering
Authors: Lantsev E A , Malekhonova N V , Chuvil`deev V N , Nokhrin A V , Blagoveshchenskii Y V , Isaeva N V , Boldin M S , Andreev P V , Smetanina K E 
Published: February 2021

Abstract
The features of spark plasma sintering (SPS) of plasma-chemical nanopowders with an increased oxygen content are investigated. It is shown that the process of shrinkage of nanopowders during SPS is limited by the rate of grain-boundary diffusion with anomalously low values of the activation energy. It has been established that a decrease in the activation energy of SPS may be due to the effect of oxygen on the diffusion permeability of grain boundaries of tungsten carbide at the stage of intense compaction, as well as anomalous grain growth at the stage of high-temperature sintering. The SPS kinetics of WC-W2C-WO3-W nanopowder compositions at the stage of intensive compaction is controlled by the rate of sintering of oxide particles with their simultaneous transformation into W2C particles, and then, at the stage of high-temperature sintering, by the process of plastic flow of W2C particles in the presence of tungsten particles. Ceramic samples with high density (98-99%), ultrafine-grained structure (average grain size less than 0.3 μm), having increased hardness were obtained by the SPS method. Hv = 30.5 GPa at Palmquist crack resistance ∼ 6.5 MPa · m1/2.
Hydrogen permeability and catalytic characteristics of a palladium-silver membrane with a modified surface
Authors: Petriev I 
Published: February 2021

AbstractThin films of Pd-23% Ag modified with nanostructured highly dispersed palladium by the method of electrolytic deposition have been obtained by magnetron sputtering. Electrochemical studies have demonstrated that the modified Pd-23% Ag film shows a high peak current (up to 2.15 µA cm−2) and excellent electrocatalytic activity in relation to the methanol oxidation reaction. The stability of the developed modified film is confirmed by the results of multi-scanning. Comparison of the hydrogen permeability has been demonstrated a significant increase in the hydrogen permeability of the modified membrane compared to the smooth one at an overpressure of 0.3 MPa. According to the approximation of the results obtained by a first-order line and calculations of the activation energy, which was 30.6 kJ mol−1, it can be concluded that the transport of hydrogen is limited by surface effects, namely chemisorption.
Development of methods of creation metal hydrogen permeation films
Authors: Pushankina P 
Published: February 2021

AbstractThe application of electrothermal and magnetron sputtering methods for manufacturing thin films containing palladium and silver is investigated. In the process of electrothermal sputtering, indirect heating of the evaporated material was used in a tungsten and tantalum boat, through which a current has been conducted and a direct heating of a thin plate of palladium alloy has been entailed by current. A composite target for magnetron sputtering of alloys using silver and palladium plates with different ratios of their areas has been developed. The dependence of the film composition on the target composition is determined. As a result of sputtering for 40 min, a sample with a thickness of 1.1 microns and a silver content of 23.2±0.7% was obtained from a target with an area ratio S(Ag)/S(Pd) = 20.8/79.2.
Structure and functional properties of rapidly quenched TiNiCu alloys with high copper contents
Authors: Shelyakov A V , Sitnikov N N , Borodako K A , Khabibullina I A , Dyadechko A A 
Published: February 2021

AbstractThin materials exhibiting the shape memory effect, with a narrow temperature hysteresis, are required to create miniature and high-speed devices. Quasi-binary intermetallic TiNi-TiCu alloys with high copper contents (more than 10 at %) demonstrate the reversible martensitic transformation with a small (4-6 K) hysteresis. Alloys of the TiNi–TiCu system with a copper content of 30–40 at.% were fabricated in an amorphous state by the planar flow casting technique at a melt cooling rate of 106K/s in the form of ribbons 30–50 μm thick. The alloy samples were subjected to dynamic crystallization using a single electric current pulse with duration of 5 ms. X-ray diffraction studies revealed almost fully martensitic state of the alloys with B19 structure at room temperature. TEM examination showed their structure to contain typical B19-martensite plates with a mean size of 20–80 nm. At the same time, the alloys exhibit a one-stage phase martensitic transformation B2↔B19 in the temperature range of (55÷75)°C, as well as pronounced shape memory effect, whose properties are largely determined by the structural parameters of the alloys.
Investigation of the influence of substrate materials on oxidation resistance of TaSi2 and Ta-Si-N coatings using SEM, EDS and GDOES methods
Authors: Sytchenko A D , Kiryukhantsev-Korneev Ph V 
Published: February 2021

Abstract
Coatings were obtained by magnetron sputtering of a Ta-Si target onto Al2O3, Mo, Si and Ni-based substrates. Samples were studied in terms of their structure, mechanical properties and oxidation resistance by SEM, EDS, nanoindentation and GDOES methods. It was found that an increase in the concentration of nitrogen leads to an increase in the hardness of coatings by 60%. The behavior of coatings and various types of substrates during annealing at a temperature of 1000-1200 ˚C.
Peculiarities of deformation of thin-sheet TRIP steel under static and fatigue loading
Authors: Prosvirnin D V , Kolmakov A G , Larionov M D , Pivovarchik S V 
Published: February 2021

Abstract
The features of the deformation of austenitic-martensitic thin-sheet TRIP steel under static and fatigue loading with varying parameters of the breaking rate as well as the maximum cycle stress under cyclic loading were studied. The ten-fold increase in the tensile rate led to the decrease in the ultimate strength by ≈ 6% and the relative elongation δ from 32% to 21%, which is due to a decrease in the intensity of the formation of deformation martensite. The nature of hardening during deformation of steel under static and repeated tension is almost the same. The effect of the greatest TRIP - strengthening under loading to the yield-point stress level and physical fatigue limit were found. Preliminary fatigue loading up to σmax = 1550 MPa with N = 3000 led to the increase in the yield strength and ultimate strength by ≈200 MPa and ≈100 MPa, respectively; the relative elongation decreased by a factor of 2.
Design and implementation of an Arduino-based instrument for parabolic motion
Authors: Sesa E , Labania H M D , Darwis D , Ismail M , Badaruddin  , Maskur  , Ulum M S 
Published: February 2021

Abstract
The lack of a physical instrument for determining the initial speed of experiment of the parabolic motion in the Department of Physics, Tadulako University, is one problem. In this research, we have been designed, implemented, and tested to show the initial velocity value of an Arduino-based to address this problem. The stages of this research began with the design and manufacture of mechanical systems, electronic systems such as power supply circuits and infrared detector circuits, motor stepper circuit, a series of servo motors, LCD circuits, and keypad circuits using the Arduino ATmega 2560 microcontroller. The next stage is making the test program and the main program. This tool has been tested and operated so that it gets good results. The initial measured speed is displayed on the LCD. The stability of measuring objects is excellent based on a low standard deviation between 0.02 - 0.06.
Synthesis and characterization of membrane from high molecular weight polyeugenol
Authors: Rahim E A , Fong R C Z , Sumarni N K 
Published: February 2021

Abstract
High molecular weight polyeugenol was synthesized by cationic polymerization, using the H2SO4-CH3COOH catalyst, and further characterized. Furthermore, the polymers were determined to be heterotactic using 1H measurement, while the membrane produced from a combination of PVC/DOP (32:38) and DOP was liquid, with polyeugenol alone generating solid. The result of Scanning Electron Microscopy (SEM) analysis indicates a pore size of 42.3 - 127 μm in polyeugenol membrane and the potential for application in the filtration of yeast cells, bacteria, and oil emulsions.
Application of zeolite intercalated calcium carbonate from pokea shell (Batissa violacea celebensis) waste as adsorbent Ni2+ ion
Authors: Mashuni  , Ahmad L O , Hamid F H , Sudarlin  
Published: February 2021

Abstract
The purpose of this study was to obtain adsorbent zeolite modified by CaCO3 from pokea shell (PS) waste to adsorb Ni2+ ions. Adsorbents are made through the intercalation method, where the PS powder is mixed to zeolites in 0.1 M HCl with 3 ratios of 3:1, 2:2 and 1:3 (g/g), respectively. The optimization of adsorption power was carried out by using parameters such as pH, contact time and concentration variation of Ni2+ ion solution. The analysis of the adsorption capacity and type of bond using the Freundlich and Langmuir isotherm equations. The characterization of the active site composition of the adsorbent was used FTIR instrument. FTIR spectra showed that CaCO3 modified zeolite adsorbent include Si-OH, O-H, Al-O, Si-O, C-H, Ca-C and C-O from CaCO3 and C-O from CO3
2-functional groups. The results showed that the best adsorbent was it with the zeolite-PS powder ratio of 3:1, the optimum conditions were obtained at pH 5, contact time at 60 minutes and 45 mg l−1 concentration. Adsorption of Ni2+ ions meets the Freundlich isothermal with adsorption capacity and energy of 1.33 mg g−1 and 5.78 kJ mol−1.
Analysis correlation sea surface temperature around North Maluku waters against rainfall in the City of Ternate
Authors: Alfiandy S , Hutauruk R C H , Adzim F 
Published: February 2021

AbstractSea Surface Temperature (SST) has a role in the process of rainfall has a role in an area with varying amounts to adjust the geographical location and topographic conditions in the region. The purpose of this study is to determine the connection of Sea Surface Temperature (SST) in North Maluku Waters to rainfall in the City of Ternate area. The method used in this study is Analysis Correlation Pearson and Spline Interpolation. The results obtained show that the Sea Surface Temperature (SST) in the North Maluku Waters have a low to moderate has a connection to rainfall in the City of Ternate area. When the Sea Surface Temperature in the North Maluku Waters region increases, the rainfall in the City of Ternate will also increase, conversely, if a Sea Surface Temperature in the North Maluku decreases, the rainfall in the City of Ternate will also decrease. The connection of Sea Surface Temperature (SST) to rainfall is in the low to moderate category, but it can already indicate that when Sea Surface Temperature (SST) in North Maluku Waters has an increased the rainfall in the City of Ternate region will also increase.
Comparison of Kernel regression model with a polynomial regression model on financial data
Authors: Nur’eni  , Fajri M , Astuti S 
Published: February 2021

AbstractRegression analysis is constructed for determining the influence of independent variables on the dependent variable. It can be done by looking at the relationship between those variables. This task of approximating the mean function can be done essentially in two approaches, parametric and nonparametric approach. Kernel regression is one of the models with a nonparametric approach, and polynomial quadratic regression is one of the models with the parametric approach. This research aims to find the best model regression with compare to the model of kernel regression and model of polynomial quadratic regression in financial data usingRMSEcriterion. Share data that be used is Mastercard Incorporated (MA) with data periods 02 Januari 2019 until 31stDecember 2019. Research’s result indicated that for MA data, best model regression is kernel regression withRMSEvalue = 16,00147 andBandwidth (h) =25,64.
Variability of surface wind in Banda Sea and its correlation with El Niño and Southern Oscillation
Authors: Nanlohy P , Elake A Y , Andayany H , Kelkusa M 
Published: February 2021

Abstract
Variability of surface winds in the Banda Sea and its correlation to El Nino and Southern Oscillation (ENSO) have been clearly demonstrated using the European Center for Medium-Range Weather Forecasts (ECMWF) reanalysis data. Surface winds in the Banda Sea are affected by monsoons. When the northwest monsoon, the wind comes from the north and west to the southeast, while the southeast monsoon, the wind comes from the southeast to the northwest. ENSO changes the direction and speed of the wind during the west season, whereas it only changes the speed during the east season.
Effect of heating and electric conductivity of anthocyanin extract from red dragon fruit (Hylocereus polyrhizus) as a sensitizer material
Authors: Iqbal  , Basir Cyio M , Darwis D 
Published: February 2021

Abstract
Research on the Effect of Heating and Electrical Conductivity of Anthocyanin Extract from Red Dragon Fruit (Hylocereuz Polyrhizus) as a sensitizer has been conducted. Red dragon fruit (Hylocereuz polyrhizus) was macerated extracted with a solvent ratio of 1: 2. The absorbance was measured at a wavelength of 300 - 700 nm using a UV-Vis spectrometer with a dilution of 25 times. Extract stability test due to heating was carried out at temperatures of 40°C, 50 °C, 60 °C, 65 °C, 70 °C and 80 °C. The results showed that heating temperature causes a decrease of absorption, the sensitizer material of extract was unstable at high temperatures ranging from 70 °C and above, it was observed with the occurrence of color changes and the wavelength and absorbance were not measured. The electrical conductivity in bright conditions of the extract also decreased due to the effect of heating. Electrical conductivity in bright conditions Anthocyanin extract at temperatures: 32 °C,40 °C, 50 °C, 60 °C, 70 °C, and 80 °C are 1569 μS/cm, at 493 μS/cm, 592 μS/cm, 526 μS/cm, 474 μS/cm, 544 μS/cm, 494 μS/cm respectively.
Efficiency of SS400 steel corrosion bioinhibitor from Moringa leaf (Moringa oleifera L.) extract in NaCl solution medium
Authors: Nurhaeni  , Khairuddin  , Rosihan R 
Published: February 2021

Abstract
Steel was one of a metal mainly used to create things because hard, long-term, and can be generated in large amounts. It was easy getting corrosion, damage to metal material caused by environmental factors. Therefore, it was necessary preventive to reduce the corrosion rate by corrosion inhibitor. A study had been done on the efficiency of steel corrosion SS400 inhibitor from moringa leaf extraction (Moringa oleifera L.) in NaCl 3% solution medium. The objective was to determine soaking time and concentration of corrosion inhibitor from moringa leaf extract to inhibit the corrosion of the steel plate with the highest efficient value. The corrosion examination was conducted with a weight-loss method. Results showed that moringa leaf extract could be used as a corrosion inhibitor for steel plate SS400 in NaCl 3% with soaking time was five days in concentration 2000 ppm was 43.06%.
Modeling of tidal current and residual currents patterns in Tomori Bay, North Morowali Regency, Central Sulawesi Province
Authors: Sabhan  , Labania H M D , Mudin Y , Rahman A 
Published: February 2021

Abstract
Research has been carried out to model current patterns and residual current in Tomori Bay using Mohid Studio 2016. The model using a finite volume approach with a tidal model driven by the results of Geospatial Information Agency (BIG) predictions placed on the open boundary of the model. The modeling results are compared with the measurement results in Tomori Bay. The tidal current velocity in the high tide conditions increases the current velocity at the bay neck and weakens after passing Tokobae Island. The current velocity on the west side of Tokobae island is higher than that of the east of Tokobae. At the mouth of the bay, the current velocity on the north side is higher than at the south side of the bay mouth. The tidal current velocity is higher than the residual current with a maximum tidal current velocity of 25.3 cms−1 and a maximum velocity of residual current 12.6 cms−1. The residual current that describes the fate of pollutants while in the Tomori Bay waters. The residual flow pattern shows a vortex on the north side of the bay mouth and to the southeast of Tokobae Island.
Extreme wave height analysis using Weibull and Rayleigh distribution in some coastal areas affected by tsunami disasters and earthquakes in September 2018 at Central Sulawesi
Authors: Mudin Y , Labania H M D , Rahman Abd , Sabhan  
Published: February 2021

Abstract
One of the most important measures is the availability of data and information through research related to the analysis of extreme wave heights at each location to be built. This study aims to provide methods and information in determining extreme wave heights that have been required to be known when designing coastal structures and public infrastructure on the coast. In this study, the extreme wave height was calculated based on a wave model simulation with an incident wave scenario that has an extreme wave height at each research location. The results showed that the distribution of extreme wave height in the waters of Palu Bay, the coast of Banawa District, was closer to the Rayleigh distribution, while the waters of Sirenja District, Donggala Regency were more in accordance with the Weybull distribution. This difference is caused by the attenuation factor of wave height due to differences in coastal morphology. The attenuation value of wave height at Banawa beach reaches 53 - 78%, while in Sirenja District it is only 35 - 46% compared to the extreme wave height in the deep sea.