bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of hydrogen concentration on CVD synthesis of graphene
Authors: Kostogrud I A , Boyko E V , Smovzh D V 
Published: December 2019

Abstract
The paper is devoted to the study of AP-CVD synthesis of graphene on a copper substrate. In this work, the effect of hydrogen concentration in the synthesis gas mixture on the growth of a graphene coating is studied experimentally. Two series of experiments with methane concentrations of 0.02% and 0.05% are presented. It is shown that a change in concentration of hydrogen has a nonmonotonic effect on the degree of substrate covering with graphene. This indicates that hydrogen is involved in several competing processes. One of these processes is stabilization of the edges of growing graphene domains. Another is etching of the forming graphene structures and reduction of hydrocarbon radicals on the copper substrate surface and in the bulk. It is shown that an increase in methane concentration leads to an increase in the rate of graphene crystal growth. To preserve the kinetics of graphene domain growth, it is necessary to reduce the H2/CH4 coefficient in the working mixture.
Composite tin/carbon material synthesis by arc discharge at different helium pressures
Authors: Kozlachkov D V , Zaikovskii A V 
Published: December 2019

Abstract
Composite Sn + C electrodes were sputtered using an electric arc method. As a result, materials representing spherical tin nanoparticles packed in a carbon matrix were synthesized. The carbon matrix reliably separates the nanoparticles, preventing them from contacting and coagulating, which preserves their size. The structure of the material was studied in detail by transmission electron microscopy. The sizes of tin nanoparticles were described by a log-normal distribution, and the average size depended on the pressure of the buffer gas. The carbon structure was studied by Raman spectroscopy. It is established that tin and carbon structures are related to each other, and the processes of condensation of tin vapor and agglomeration of the carbon structure affect each other.
Measurement of silicon suboxide films thickness synthesized by the gas-jet electron beam plasma chemical vapor deposition method
Authors: Merkulova I E 
Published: December 2019

Abstract
The amorphous silicon suboxide thin films were synthesized by the gas-jet electron beam plasma chemical vapor deposition method. The thickness of the thin films was obtained using a cross-section SEM image (destructive) and an analysis of interference effects in the IR transmission spectra (non-destructive). The film thicknesses obtained by the cross-section SEM images were about 600 nm for all samples. An approximation of the silicon suboxide film thickness was made using a Gaussian distribution, which showed good agreement with the experimental values. The thickness obtained from the analysis of the IR transmission spectra increases from 400 nm to 500 nm with increasing Gmix. It was found that the oxygen concentration of the thin films decreases from 45 to 22% with an increase in Gmix.
Silicon nanowhisker formation during SiO2 evaporation by arc discharge
Authors: Zaikovskii A V 
Published: December 2019

Abstract
Nanoscale silicon is interesting in various areas, including electronics, photovoltaics, solar and Li-ion energetics. This work describes processes of electric arc sputtering of SiO2 in a graphite electrode in a helium medium, leading to formation of silicon nanowhiskers. A fan- shaped turbulent jet of vapors of the sprayed electrode flowing from the interelectrode space, resulting in formation of areas with different component compositions and temperatures, is considered. Interaction of SiO and Si vapors leads to the formation of the silicon nanowhisker structure.
Low-parametric equation for calculating the viscosity coefficient of sulfur hexafluoride
Authors: Kaplun A B , Meshalkin A B , Dutova O S 
Published: December 2019

Abstract
A low-parametric equation for calculating the SFe viscosity coefficient in liquid, gaseous, and fluid states was derived using previously obtained unambiguous dependence of the “excess” viscosity of liquids and dense gases on the density of internal energy. The equation describes the viscosity of sulfur hexafluoride at the temperatures from 230 K to 650 K and pressures of up to 50 MPa in the limits of experimental error.
The linear thermal expansion coefficient of iron in the temperature range of 130–1180 K
Authors: Kozlovskii Yu M , Stankus S V 
Published: December 2019

Abstract
The results of a dilatometric study of the thermal coefficient of linear expansion of polycrystalline iron in the temperature range of 130–1180°K are presented. The measurements were made with an error of 3%. Temperature dependences were obtained and reference tables of the recommended values of volume properties were calculated. The region of the magnetic phase transition was studied in detail, and the critical indices of thermal expansion at the Curie point were determined.
Phonon density of states and thermodynamic properties of Eu2(C11H19O2)6
Authors: Musikhin A E , Bespyatov M A 
Published: December 2019

Abstract
In the work, the phonon density of states of europium dipivaloylmethanate was calculated based on the experimental low-temperature heat capacity, and basic characteristic temperatures related to the moments of the g(ω) were obtained. The molar thermodynamic functions of Eu2(C11H19O2)6 at constant volume up to the melting point of 464 K were calculated: heat capacity, entropy, internal energy, and Helmholtz energy. The zero-point energy was determined, and total internal energy was obtained. Accuracy of the obtained results was estimated. The approach used to obtain the properties of Eu2(C11H19O2)6 is general, it can be used to study a wide range of solids.
Vapor thermal conductivity of R-125/R-134a (84.6/15.4) mixture
Authors: Raschektaeva E P , Stankus S V , Verba O I 
Published: December 2019

Abstract
The vapors thermal conductivity of binary mixture R-125/R134a (84.6/15.4) was measured with a coaxial cylinders method in the temperature range of 305–412 K and the pressure range of 0.1–1.7 MPa. The thermal conductivity as a function of pressure and temperature was considered. The correlations for thermal conductivity on dew line and in ideal gas state are presented.
Heat transfer coefficients of praseodymium in condensed state
Authors: Samoshkin D A , Agazhanov A Sh , Stankus S V 
Published: December 2019

Abstract
The thermal diffusivity and the thermal conductivity coefficients of praseodymium have been investigated by the laser flash technique with an error of 3–6% in the temperature range from 295 to 1625 K of the solid and liquid states, including the regions of phase transitions. Comparison of measurement results with the available literature data was carried out. The fitting equations and the table of reference data on the heat transfer coefficients of praseodymium for scientific and practical use have been developed.
Vapor pressure, density, and speed of sound of the R134a-R227ea refrigerants in the vapor phase
Authors: Komarov S G , Stankus S V 
Published: December 2019

Abstract
The pressure on the dew line and density of the gas-phase 69.2 wt.% R134a / 30.8wt.% R227ea refrigerant were investigated using a constant volume piezometer in the temperature range from 293 to 373 K and at pressures from 0.45 to 3.1 MPa. The speed of sound of the 70.1 wt.% R134a / 29.9 wt.% R227ea mixture (323-373 K, 1.2-1.5 MPa) was also measured using an ultrasonic interferometer. The measurement errors of the temperature, pressure, density, and speed of sound were ±20 mK, ±4 kPa, ± (0.15–0.25)%, and ± (0.2–0.3)%, respectively. Approximation dependences of the studied properties were obtained and their errors were estimated. The obtained results were compared with the calculations using the REFPROP program.
Numerical modelling of a two-channel heat and mass exchanger
Authors: Gorbachev M , Terekhov V 
Published: December 2019

Abstract
This work is devoted to the study of heat and mass transfer apparatus of indirect- evaporative type. This device consists of two channels, in one of which the processes of heat and mass transfer occur. This scheme is known in the literature as the By-pass scheme. Numerical studies of laminar flow and heat and mass transfer are carried out with variations in the input parameters (Reynolds number Re=100, temperature T
0 = 26 ÷ 32 °C and relative humidity φ0 = 40 ÷ 70 %). The resulting cooling effect in such a heat and mass transfer apparatus can be quite high and comparable with traditional air conditioning schemes, including steam-compression refrigeration machines.
The heat balance model of walling constructions
Authors: Kaledin V O , Galdin D A , Viachkin E S , Gileva A E , Viachkina E A , Ulyanov A D 
Published: December 2019

Abstract
The inverse problem of identifying the heat loss model in a building through building envelopes is considered. The linear equations of heat balance in heated rooms are used. These equations take into account the thermal conductivity through the walls and the glazing of the openings, two-way convective heat exchange of the room air with heating devices and enclosing structures, and convective heat dissipation into the environment. The results of model identification based on experimental measurements of temperature fields in the building envelope are presented.
Model of heat and mass transfer in the heating system pipe
Authors: Kaledin V O , Viachkin E S , Gileva A E , Viachkina E A , Galgin D A , Ulyanov A D 
Published: December 2019

Abstract
The paper considers a mathematical model of the temperature distribution over the heating pipe to estimate the actual parameters of the heating system based on the results of temperature measurements. An example of solving the problem of actual flow rate identifying of the coolant in the risers, the temperature at the entrance to each riser and the shunt coefficients of the radiators of the heating system of the building is given. Identification results are used to diagnose the condition of the heating system.
Natural Dyes from Secang (Biancaea sappan) Wood in Sutera
Authors: Kurniati  , Abu Asiani , Irmayanti  , Aisyah  
Published: December 2019

Abstract
Colour variations are needed to support the textile industry development to increase product attractiveness. Textile dyes can come from natural and synthetic materials. Natural dyes can be the best solution to replace synthetic which is harmful to the environment. One of the natural dyes is a secang plant. This study aims to determine the absorption of silk fabrics on the secang wood colour using fixator. The research procedure consisted of a literature review, observation, data verification, experimentation and processing using descriptive statistical analysis. The results showed that the ability to absorb silk fabric against the secang wood colour using fixators produced a very sharp and bright colour and very flat on the fabric surface. The alum fixator produces a Dark Red colour, quicklime fixator is Maroon which is included in hot colours on colour circle, while tunjung fixator is Black from other colour clumps.
The effect of pollinator insect visitation on flower development and productivity of chilli plant
Authors: Aminatun T , Budiwati  , Sugiyarto L , Setyawan S A , Desiliani A 
Published: December 2019

Abstract
This research aimed to find out; (1) the pollinator insect diversity of chili plant; and (2) the effect of pollinator insect visitation on flower development and productivity of chili plant. This experimental study was designed with a factorial completely randomized design. The independent variable was visitation of pollinator insect on plant, while the dependent variables were pollinator insect diversity, flower development, and productivity of chili plant. Each treatment consisted of 5 replicating plots, and each plot contained 4 potted plants. Flower development observation was carried out as long as the chili plant flowering. As supporting data were the frequency and longevity of pollinator visiting. The results showed pollinator insects on chili plants were Trigona, Apis, Lasioglossum, and Camponotus. The highest frequency of visitation were Trigona and Camponotus, while the highest longevity was Camponotus. The inhibitory treatment of pollinator insect visitation caused the plant began to flower more slowly and the flower bloomed last longer. The plant was also harvested 2 months slower, and the average number and weight of fruit per plant tended to be lower.
Development of Non-QWERTY Balinese Script Keyboard Through Tamiang Keyboard Optimization With Letter Frequency Concept
Authors: Pradnyana G A , Setiawan G A , Wirawan I M A 
Published: December 2019

Abstract
Aksara Bali (Balinese Script) is a traditional Indonesian script that developed in Bali, and also known as Hanacaraka. Tamiang Keyboard is a non-qwerty keyboard for typing Balinese script. This keyboard was developed using character extraction methods from the Balinese language dataset by rewriting Balinese script into Latin or Roman characters. The advantage of using the Tamiang keyboard is that users can type Balinese script like writing or “nyurat” Balinese script without various rules such as when using script fonts. Tamiang Keyboard development focuses more on the typing mechanism and placement of Balinese letters on a keyboard button. However, the placement of letters on the keyboard is only based on the separation of letters that often appear on the datasets. This process has an impact on the effectiveness and convenience of users in typing Balinese language using Tamiang Keyboard. In this study, a new Balinese script keyboard was developed by applying the letter frequency concept to optimize Tamiang Keyboard. Letter frequency calculations are used to analyze aspects of home row usage, hand load analysis, and analysis of finger loads when typing balinese language with Tamiang Keyboard. The analysis of these three aspects is used for re-mapping the letters on the keyboard.
The Development Of Physical And Sport Education Learning Model By Using Small Games
Authors: Bukhari K , Efendi Z. M , Jama J 
Published: December 2019

Abstract
The purpose of this research is to (1) develop a in learning Physical and Sport Education learning model through small games in increasing a disciplined and confident attitude that was practical and effective of Volley Ball state vocational high school Bengkulu and (2) knowing the validity and reliability of the learning model, so that it could be used to measure students’ discipline and self-confidence. The type of this research is a research and development that followed up with the development of education. Procedure development on Physical Education and Sports Skills, Skills model through small games in instilling based on the ADDIE model, consisting of five stages, namely analysis, design, development, implementation, and evaluation. The location of these product trials conducted among students vocational high school Bengkulu. The instruments used to collect the data were questionnaire and evaluation sheet. Data analysis techniques of this research use descriptive analysis technique in the form of the percentage. Subject of this study was class X (34 students). Data were obtained by observation techniques and analyzed by descriptive analysis. The result of this research shown that learning model develop a in learning Physical Education and Sports Skills model through small games in instilling a disciplined and confident attitude that was practical and effective to enhance the effectiveness of learning organized by teachers and attended by students sampled in this research. The results of this study use affective assessment by observation, namely variable of students in instilling discipline and confident in learning phsysical education and sports skills, with the acquisition of a good average score then the highest score of 76 % who got a very good criteria and criteria less than 0 % did not exist.
Augmented Reality-Based Instructional Media for Electrical Power Protection Learning
Authors: Maryadi Totok Heru Tri , Sukisno Toto , Chandra N. Ariadie , Atmoko A. Widi 
Published: December 2019

Abstract
Augmented reality is a technology that combines two-dimensional and/or three-dimensional virtual objects into a real three-dimensional environment and projects those virtual objects in real time. This study was aimed at discussing (1) the development of an instructional media for power system protection learning, especially the fuse cut out, using augmented reality, (2) the appropriateness of the developed media as evaluated by both material and media experts, and (3) the users’ responses toward the developed media. This media was developed using the waterfall model proposed by Pressman, consisting of four main stages: analyzing, designing, coding, and testing. The performance test proved that this media functioned properly (100%). This media was categorized as “highly appropriate” in terms of the materials presented as evaluated by the material experts with a mean score of 96.5 out of 112. Meanwhile, the media was “appropriate” as evaluated by the media experts with a mean score of 68 out of 84. For the end users of this media, 75% of them perceived this media as “highly appropriate”, while the rest considered it as “appropriate”.
Development of e-learning content with H5P and iSpring features
Authors: Amali L N , Kadir N T , Latief M 
Published: December 2019

Abstract
E-learning is currently a fast-developing learning method. Interactive multimedia technology, which combines computer technology, video, and audio, is needed to support this e-learning system. The objective of this study is to develop e-learning content based on interactive multimedia to support the effectiveness of a learning system. SDLC (System Development Life Cycle) method with the waterfall model was used in this study. The output of this study is developed e-learning with additional content that utilizes interactive multimedia features, H5P, and iSpring. Through this system, the teacher can create content improvement in the learning model. The system provides various learning sources and activities to support a more interactive teaching and learning process. This e-learning can ease students in understanding the materials and motivates them in learning through this multimedia learning media.
Development of Interactive Learning Media based on Android Education Geography
Authors: Arliza Rika , Yani Ahmad , Setiawan Iwan 
Published: December 2019

Abstract
This research is a type of product development that aims to determine the feasibility of developing interactive learning media products based on Android. The research method used is the design of the development model used in this study is the adaptation of the Luther model. The results of this study are: (1) Android-based interactive learning media applications on national cultural material and global interactions are arranged by getting input from validators (2) the results of the feasibility of the percentage of android-based interactive learning media by media experts are seen based on the aspects of animation, video aspects, video aspects, packaging aspects, packaging aspects, packaging aspects and aspects of use.
Development of Work-Based Learning SpSG Open Mining Operations
Authors: Murad MS , Kopa Raimon , Ansosry  
Published: December 2019

Abstract
The purpose of this study was to look at a development of the SpSG Work-Based Learning (WBL) model that can activate students. The model designed can be applied by lecturers and according to industry needs. Reveal the impact of the development of a model designed to increase student competence in the Open Mining Operations (OTT) course in Mining Engineering. The chosen industrial location is the Limestone Mine. PT. Semen Padang and Coal Mine PT. AICJ Sawahlunto. The development of the model designed is WBL SpSG (Shift per Shift Group). This is done by considering the time of activities and procedures that apply in the location of the mining industry. Besides integrating all existing competencies in the workplace as a whole by first being given the subject matter of the operational theory of open mining on campus with a program of practical experience directly at the mine site which is guided by qualified industrial teaching staff. The model designed can be applied by lecturers and according to industry needs and to improve student learning outcomes in the Mining Engineering Study Program.
Validity of Android-Based Learning Media in Subject Measurement and Instrumentation
Authors: Eliza Fivia , Myori Dwiprima Elvanny , Fadli Radinal 
Published: December 2019

Abstract
Electrical Measurement and Instrumentation is an important thing that must be mastered by electrical engineering students. But the problem that arises is the decreased interest in reading books, so that students need the other ways of learning. Then by utilizing the development of android technology, this study aims to develop the android based learning media to assist students to understanding the material. This research was adopted 4D model that have 4 development steps (define, design, develop, disseminate). Validity of the media was measured by instrument of validity that had been validated before. The average calculation result from the validity analysis of the learning media is 85% with valid category. So it can be concluded that android based learning media on Electrical Measurement and Instrumentation course was valid to be used as a learning media.
The role of industry partners to improving student competency of vocational high school
Authors: Sumbodo Wirawan , Yudiono Heri , Salim  , Setiadi Rizki 
Published: December 2019

Abstract
The partner industry has an important role in increasing the competence of vocational students. Therefore they have the competencies needed by the partner industry, since it has a role in increasing student competence. This study aims to determine the relationship of the role of partner industries in improving milling machine competencies, to find out the differences in student competencies after engagement with industry. This study is an ex-post facto study and the population from 34 students of class XI in SMK N 1 Semarang, a public vocational high school (VHS). Data collection techniques in the form of observations, in-depth interviews, and questionnaires. Data analysis uses descriptive statistics. The results of the study show that there was a positive and significant relationship between the role of industry in improving student competence. Based on data analysis using IBM SPSS Statistics 20, the results of coefficient number correlation between the role of industry and increasing competency are classified as high with a value of 0.690. There are differences in student competencies before and after partnering with industry, average to 8.75%. VHS should always involve the industry in improving student competencies to be relevant to industry needs.