bluuebunny/crossref_metadata_2025 huggingface dataset:
Interaction of pressure waves with a bubble layer near free surface of a liquid
Authors: Ogorodnikov I A
Published: December 2019

The radiation of pressure waves by a bubble layer near the free surface of a liquid excited by a high-intensity sound pulse has been studied. It was shown that the bubble layer exhibits the properties of a resonator with one partially transparent boundary. Bubbles on the boundary of the layer due to the interaction through the self-consistent field with the bubbles inside the layer perform collective pulsations. It was found that the emission spectrum of the layer is ruled. The lines of the emission spectrum of a layer have a regular composition and lie above the frequency of the intrinsic pulsations of bubbles.
Drop entrainment in two-phase non concurrent film flow
Authors: Saushin I I , Goltsman A E , Salekhova I G
Published: December 2019

When the motion vectors of the media are collinear, well-known experimentally obtained empirical criteria are used to assess the conditions for the drop entrainment by the gas flow from the surface of a moving liquid film. However, blowing a liquid film at an angle with gas causes a tangential component in the film movement, which is an additional factor affecting its thickness and the velocity profile. The paper presents the correctness of the criterion of the conditions for the drop entrainment and the effect of the noncollinearity of the vectors of the media counterflow on the dynamics of a liquid film estimated from the results of numerical simulation.
Viscosity and rheology of the ethylene glycol based nanofluids with single-walled carbon nanotubes
Authors: Rudyak V Ya , Tretiakov D S
Published: December 2019

The work is devoted to the experimental study of the viscosity and rheology of nanofluids based on ethylene glycol with single-walled nanotubes. Polyvinylpyrrolidone is used as a dispersant. The weight concentration of nanotubes ranged from 0.01 to 1%. In all cases, the weight concentration of the dispersant was controlled. The measurements were carried out in the temperature range from 20 to 40°C. It was shown that at all weight concentrations the solution of ethylene glycol and dispersant is a Newtonian liquid, and at a maximum concentration (4%) the viscosity of the solution is two and a half times higher than the viscosity of ethylene glycol. At the same time, all the studied nanofluids turned out to be non-Newtonian and have a pseudoplastic character. It was established that ultrasonic treatment of nanofluids leads to partial degradation of the dispersant and a decrease the base fluid viscosity. The degree of this degradation increases with increasing ultrasonic processing power. With the considered low weight concentrations of nanotubes, the dependence of the viscosity coefficient of the nanofluid on temperature is determined by the corresponding dependence of the base fluid.
Numerical simulation of the oil displacement process from a porous medium by nanofluid
Authors: Minakov A V , Mikhienkova E I , Pryazhnikov M I , Zhigarev V A
Published: December 2019

Numerical simulation of the oil displacement process from a porous medium by nanofluid was carried out. To describe this process a flow model of two immiscible fluids taking into account the surface tension forces and the wetting angle was used. The simulation results of the penetration of fluid with nanoparticles into a porous medium are obtained using the example of the oil displacement. The nanoparticles addition to the displacing fluid affects the process of oil displacement from porous medium significantly. SiO2 particles with a size of 5 nm were used as nanoparticles. The concentration of nanoparticles ranged from 0 to 1 wt.%. The main reason for the increase in ORF (oil recovery factor) during oil displacement by nanofluid is the improvement of rock wetting.
Experimental study of heat transfer under flow boiling ozone-safe refrigerants in microchannels
Authors: Shamirzaev A S , Mordovskoy A S , Kuznetsov V V
Published: December 2019

This paper devoted to experimental measurement of heat transfer and critical heat fluxes into horizontal microchannels under flow boiling of refrigerant 141b. The copper experimental test section contains two microchannels with a 2x0.36 mm cross-section. Average heat fluxes versus wall superheat in the range of mass fluxes from 600 to 2100 kg/m2s and heat fluxes up to 140 W/cm2 are presented. A slight deterioration in heat transfer relative to pool boiling with heat fluxes close to critical was observed.
Exergetic evaluation of a thermal station “Central’naya” and Vladivostok thermal station – 2
Authors: Bibikov D R , Dorogov E Y , Goncharenko Y B , Shtym K A
Published: December 2019

The article discusses the issue of increasing the efficiency of the main equipment of thermal power plants. Currently in power systems, different types of power plants are used. The projecting and choice of the power plant is performed mainly based on criterion of efficiency. The primary indicator is the thermic efficiency calculated traditionally by heat balance method. The current article proposes the use of exergy method of determining of energy efficiency, allowing performing relative (exergetic efficiency) and absolute evaluation of the degree of thermodynamic perfection of the system. The exergy losses in elements of the equipment were calculated on the example of a gas turbine installation.
Influence of gas flow rate on the synthesis of gas hydrate of freon 134a by the method of explosive boiling of liquefied gas in water volume
Authors: Meleshkin A V , Bartashevich M V , Kozlov A N
Published: December 2019

This paper is part of the work aimed at finding the optimal parameters of the method of explosive boiling of liquefied hydrate-forming gas in a volume of water during decompression. The paper presents an experimental study of the effect of gas flow during decompression on the synthesis of gas hydrate. The studies were carried out at constant operating parameters, with a change in gas flow during decompression. The studies were conducted on hydrate-forming gas Freon 134a.
Simulation of thermal characteristics of heat supply systems in variable operating modes
Authors: Rafalskaya T A
Published: December 2019

The operation of heat supply systems is often associated with the inefficient use of heat energy. New formulas have been obtained for calculation of variable thermal and hydraulic modes of heat exchangers of heat supply systems. The rather high correlation coefficient of the operational and design parameters of the heating system operation makes it possible to use the obtained formulas to optimize the variable operating modes of heat exchangers when using programmable regulators.
Investigation of steam-air gasification of mechanically activated coal fuel at a setup with thermal capacity of 1 MW
Authors: Butakov E , Burdukov A , Siniakov I , Chernova G
Published: December 2019

In this work, steam-air gasification of mechanically activated coal was studied experimentally. To increase the energy efficiency of coal flaring, a technology with mechanochemical activation of coal by the mills is being developed at the Institute of Thermophysics SB RAS. The technology is aimed at increasing coal reactivity and can be used to replace high-reactive expensive and difficult-to-obtain fuel oil for ignition and lighting of pulverized coal boilers of thermal power plants (TPP) using mechanically activated microground coal. In experiments, we used brown coal from a deposit in Siberia. The results on the effect of steam flow rate to the continuous gasifier and the point of injection were obtained. During the experiment, the time of autothermal regime stabilization was measured, and it was 105 s. Five different regimes of continuous gasifier operation have been tested. For steam-air gasification with a steam flow rate of 32 kg/h and air excess coefficient of 0.5, concentrations of combustible gases at the end of the continuous gasifier were obtained: H2 (vol.%) = 6.3; CO (vol.%) = 10.7; CH4 (vol.%) = 0.4.
Analytical investigation of the fuel rod destruction and melt relocation along the surface of the fuel rod
Authors: Usov E V
Published: December 2019

To simulate fuel rod thermal destruction, analytical approaches were developed. Approaches are based on solving the Stefan problem and solving the equation of motion of the molten materials. The paper contains a brief description of the ways to obtain analytical solutions and applicability limits of the solutions. Calculation of the mass of the melt that left the central part of the fuel rod is presented. Proposed analytical solutions can be used only to simulate the first stage of the accidents from melting inception of the cladding to destruction of the whole fuel assembly.
Low temperature plasma-assisted nitriding of austenitic steel in a ferromagnetic enhanced inductive discharge
Authors: Isupov M V
Published: December 2019

Plasma-assisted nitriding of austenitic stainless steel AISI 321 has been performed with the use of a ferromagnetic enhanced inductive discharge as the source of nitrogen ions and radicals, in the temperature range of 300–400°C, gas pressure of 50 mTorr and ion densities of about (2.5–7.7)·1010 cm−3. A significant increase in the nitriding rate was achieved, in comparison with a low temperature glow-discharge nitriding process. A possible mechanism of the nitriding rate increase is a high atomic nitrogen density achieved in the ferromagnetic enhanced inductively coupled plasma.
Formation of nanostructures on the surface of KTP single crystals by argon cluster ion beam
Authors: Nikolaev I V , Korobeishchikov N G , Roenko M A
Published: December 2019

In this work, the surface of potassium titanyl phosphate (KTP) single crystals has been processed by argon cluster ions having low energy per atom E/Nmean
= 12.5 eV/atom. The formation of periodic nanostructures has been studied using atomic force microscopy (AFM) and the power spectral density (PSD) functions. To evaluate the processing efficiency, the dependence of the etching rate of KTP on the incident angles of cluster ions has been investigated. It is shown that the average etching rate 〈Vetch〉 varies between 0.46 and 1.1 nm/min with an incident angle change from 0° to 70°.
Investigation of the effect of an acoustic field on the flow regime of a microjet
Authors: Perepelitsa B V
Published: December 2019

A detailed visual study of the structure of a circular laminar micro-jet flowing into the atmosphere under the influence of an acoustic field was carried out. A jet of air flowed out of the profiled glass nozzle with a diameter of 500 microns. Characteristic vortex and coherent structures and zones with intense turbulent mixing were found in the flow. The features of the formation of vortex structures in a laminar jet under the influence of the acoustic field and the vibrational-rotational flow regime in the jet at the outlet of the nozzle were identified.
Investigation of electrophysical and thermophysical characteristics of a low frequency nitrogen inductive discharge
Authors: Pinaev V A , Isupov M V
Published: December 2019

A low-frequency (100 kHz) ferromagnetic enhanced nitrogen inductive discharge has been experimentally investigated in the nitrogen pressure range of 5–55 Pa and discharge current density of 20–80 mA/cm2. Dependence of the discharge electric field strength E on the gas pressure was measured for various discharge currents. Dependence of the neutral gas temperature on the gas pressure and discharge current was determined using optical emission spectroscopy, from the measured 0–0 vibro-rotational band of the second positive system of molecular nitrogen (C3Πu–B3Πg). Based on the determined neutral gas temperatures, values of the reduced electric field strength E/N were calculated.
Temperature distribution of gas flows in a grid area activated by chemical vapor deposition
Authors: Safonov A I , Panin D Y , Timoshenko N I
Published: December 2019

The scheme of gas temperature measurements in flows of rarefied precursor gases by HW CVD was elaborated. The gas flow temperature of air, argon and hexafluoropropylene oxide was measured at different mass flow rates. The presence of a large well-heated area in gas flows forward the activator was discovered. Asymmetric heating of the gas flow in areas above and under an activator was observed. Cooling of gas flows by increase in the precursor gas mass flow rate was confirmed. The parameters, optimal for the formation of the area with uniform temperature flows above the surface of substrate holder, were determined.
Mutual diffusion in liquid alloys of heavy alkali metals with bismuth
Authors: Abdullaev R N , Khairulin R A , Stankus S V
Published: December 2019

Interdiffusion coefficients for liquid cesium–bismuth alloys containing from 20 to 40 at. % Bi are measured using a gamma-ray attenuation technique. The obtained results are compared with the data on mutual diffusion in the rubidium–bismuth melts studied earlier. The comparison shows that the concentration dependences of the interdiffusion coefficient for Rb–Bi and Cs–Bi liquid systems demonstrate common features, namely, pronounced maxima at certain compositions. The origin of these features is briefly discussed.
Thermal conductivity of rubidium–bismuth alloy of equiatomic composition
Authors: Agazhanov A Sh , Abdullaev R N , Samoshkin D A , Stankus S V
Published: December 2019

Experimental data on the thermal conductivity and thermal diffusivity of a liquid alloy RbBi of the equiatomic composition in the temperature range from the liquidus line to 1174 K have been obtained. The measurements were carried out on the basis of the laser flash method using a sealed steel cell. For studied properties the approximation equations and a table of recommended values are presented. The analysis of the obtained results confirms the existing assumption about liquid rubidium-bismuth alloys as associated solutions.
Experimental study of boron nitride in a wide temperature interval
Authors: Agazhanov A Sh , Samoshkin D A , Kozlovskii Yu M , Stankus S V
Published: December 2019

In the present work thermal conductivity (λ), thermal diffusivity (a), heat capacity (cp
) and linear thermal expansion coefficient (LTEC, α) of boron nitride (BN) with hexagonal modification were studied in a wide temperature range of 298–1273…1474 K. The experiments were performed on the samples made from the same starting material with a density of 1.64 g/cm3 at room temperature. For all studied properties the approximation equations were obtained and the tables of recommended values were developed that can be used for various scientific and practical applications.
Low-parametric equation for calculating the methane viscosity coefficient of liquid, gas and fluid states
Authors: Kaplun A B , Dutova O S , Meshalkin A B
Published: December 2019

A low-parametric equation for calculating the CH4 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 methane at the temperatures from 91 K to 620 K and pressures of up to 50 MPa in the limits of experimental error.
Investigation of thermal conductivity coefficient of aqueous suspension with carbon nanotubes
Authors: Pryazhnikov M I , Minakov A V , Guzei D V , Lobasov A S , Platonov D V
Published: December 2019

The dependence of thermal conductivity of suspension on the concentration of single-walled carbon nanotubes was investigated. Mass concentration of nanotubes ranged from 0.05 to 0.5%. Sodium dodecyl sulfate was used as a surfactant. The enhancement of 34.8% were achieved for thermal conductivity coefficient of suspensions at 0.5wt.% of CNT.
Waves of large amplitudes in geophysical and technical applications
Authors: Derzho O G
Published: December 2019

The paper addresses the asymptotic models that explicitly describe the structure of solitary waves with recirculation zones for some special but important incident stream configurations, which occur in geophysical and industrial applications . The key feature that allows building a theoretical model is that shear and/or stratification of the media in geophysical applications or axisymmetric swirling incoming flows in technical applications have an almost linear equation for vorticity. It happens when the upstream flow is almost linearly stratified in the case of geophysical applications and a swirling flow has almost solid body rotation if industrial applications are considered. It is shown that the resulting equation for the stationary amplitude function of the solitary waves is described by a generalized Korteweg-de Vries equation in the outer zone, consistenty matched with a new complicated equation in the inner zone, which contains the recirculation core. This recirculation zone exists for wave amplitudes that are slightly greater than a certain critical amplitude, for which a wave breaking initially occurs. The recirculation zones have a universal structure, so that their width increases up to the semi-infinite bore as the amplitude of the wave increases from a critical amplitude to a certain maximum amplitude. This amplitude may be sensitive to the actual configuration of the incident flow. Regardless of the physical nature, solitary waves are described by two types of equations with different non-linearities. The type of nonlinearity in the inner zone where the vortex core is located is then caused by the position of the vortex core at the outer boundary or in the middle of the flow.
Analysis of cycles of air-cooling machines with multi-step compression and expansion
Authors: Gorbachev M
Published: December 2019

The technique has been developed for estimating and analysing the thermodynamic efficiency of reversible cycles of air-cooling machines of multi-step compression and expansion using the exergy method. Analytical dependences have been obtained, and the influence of initial parameters on the main energy characteristics and thermodynamic efficiency of the cycles, expressed by exergy efficiency, has been analyzed. Numerical studies were carried out with number step compression and expansion from n = 1 to ∞. Shown that with n = ∞ the cycle of the air cooling machines with multi-step compression and expansion were transformed in to Carnot cycle, and with n = 1 it goes into a cycle with isobars supply and removal of heat to the working body.
Influence of conjugate convective heat transfer on temperature fields in thin walls that organize liquid layers of various orientations
Authors: Mitin K A , Kislitsyn S A , Berdnikov V S
Published: December 2019

Numerical studies of unsteady conjugate natural convective heat transfer in the model of a thin-walled fuel tank are carried out in the conjugate formulation. The fields of temperature in liquid and in solid walls of the tank are calculated. The evolution of convective flows and temperature fields after a sudden supply of heat to the base of the tank is investigated. Flat layers of liquid enclosed between flat walls of different orientations with inclination angles of 0, 30, 45, 60 and 90 degrees are considered. With the angle of inclination of 0 degrees the outer surface of the side walls is insulated. The outer surface of the lower wall heats up suddenly, the outer surface of the upper wall is isothermally cold. The system of equations of thermogravitation convection in the Boussinesq approximation in dimensionless form, written in terms of temperature, vector potential of the velocity field and velocity vortex, is solved. It is shown that an inhomogeneous temperature field is formed inside the solid walls of the finite thermal conductivity. The thermal conductivity of walls and conditions at the upper boundary of the liquid layer affect significantly the spatial form of convective fuel flows in fuel tanks and laws of conjugated natural convective heat exchange.
Analysis of heat transfer for gas flow in the multichannel plate heat exchanger depending on the gas Prandtl number
Authors: Slesareva E Y , Elistratov S L
Published: December 2019

The analysis of an experimental investigation of heat transfer for a gas flow into the multichannel plate heat exchanger depending on the gas Prandtl number is presented. The gas mixture with Prandtl number of 0.23 and 0.7 were used. It is shown that the design procedure by the method a local thermal balance possesses an adequate accuracy for verification design equation for Nusselt number, including definition of the conditions validity of the model of flow regime heat exchanger.
Integrated studies of convection and ice layer formation during cooling of the bottom of a rectangular cavity
Authors: Zolotukhina O S , Arbuzov V A , Berdnikov V S , Dubnishchev Yu N , Grishkov V A , Kislitsyn S A , Mitin K A
Published: December 2019

Experimental studies of the processes of crystallization of water as a liquid — simulator of melts with an inverse dependence of the density of melts on temperature — were carried out on two flat models. With the rapid cooling of the bottom of the cavity, substantial undercooling of the bottom layer of the liquid can be observed. The hydrodynamics in the process of growth of the ice layer at the bottom of the cavity was investigated. The effect of convective flow on the rate of crystallization and on the forms of the crystallization front has been studied. The evolution of the temperature field in the process of crystallization of water at the lower cooled boundary of the cavity is studied. It is shown that the evolution of temperature fields tracks the development stages of instability of the bottom layer of a liquid and the development of Rayleigh-Benard convection observed in a hydrodynamic experiment.
Identification of Biology Student’s Misconception in Makassar State University on Cell Biology by Applying Two-Tier MCQs Method
Authors: Hala Yusminah , Arifin Arifah Novia , Satar Suriyah , Saenab Sitti
Published: December 2019

This study aims to know the level of understanding of UNM student’s experiencing misconceptions, understand the concept and do not understand the concept about cell biology using Two-Tier MCQs method. This research includes descriptive research. In this study, the Two-Tier MCQs method to identify student’s misconceptions. Population in this research is all student of study program of biology of UNM class 2015. Samples in this research as many as 20 people who tried randomly. Instruments used to test Two-Tier MCQs and interview methods to determine the causes of misconceptions. The result of data analysis shows that the highest misconception is in the mate rial structure and function of mitochondria and the lowest is in the cell cycle material.
The effect of annealing on ZnO:Al thin film growth on preparatory glass substrate by dc magnetron sputtering
Authors: Sugianto S , Astuti B , Firmahaya N A , Aryanto D , Isnaeni
Published: December 2019

Al doped ZnO (or ZnO:Al) thin films were deposited onto a preparatory glass substrate using dc magnetron sputtering. The effect of annealing time was 0, 30 and 50 minutes onto the structural, morphological, optical properties and electrical properties of the ZnO:Al films have been investigated. Thin films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL) and I-V measurements, respectively. XRD measurement showed that each sample had an amorphous structure. The morphology of the film was more homogeneous when annealed in 50 minutes. PL characterization showed two emission peaks, namely blue emissions at a wavelength of 447 nm and red emissions at a wavelength of 752 nm. ZnO:Al film with an annealing time of 50 minutes had a higher blue emission PL intensity than other films.
Control System based Photocell, Timer and Temperature Sensor
Authors: Sumual H. , Seke F R
Published: December 2019

The development of automation has penetrated in various fields including electro. Photocell; Timers; and Temperature Sensors-based control systems (FTS) is systems with performance that can save work time and simplify work through the process of automation. This study aims was to make innovations in practical equipment that can facilitate the learning process of controlling techniques, namely designing FTS-based controller systems. The research method used developing method of the ADDIE model. The research was conducted at the Unima Electrical Engineering Education Laboratory of the Faculty Engineering. The results of the study show that the design of the FTS control system can be used and applied in daily life, such as the needs in the field of agriculture and fisheries, it can also be used as an integrated laboratory learning media in electrical engineering education. This FTS-based controller system design can also improve the understanding of electrical engineering students about controlling techniques.
Foundation of Mathematics Courses Using Virtual Learning
Authors: Masriyah  , Fardah D K , Wintarti A
Published: December 2019

This study aims to describe the learning outcomes and students’ responses after joining in the Foundation of Mathematics courses using virtual learning. The research subjects were Mathematics students who programed the Foundation of Mathematics which consisted of 31 people. The method of data collection was carried out by test methods and questionnaires. This learning was said to be successful if the learning outcomes of students at least 70% get A. A-, B+, or B grades or at least 70% the scores obtained by students was more than or equal to 70, and students’ responses after joining in Foundation of Mathematics courses using virtual learning is positive category (the percentage of students positive responses was more than 70%). Based on the results of data analysis it can be stated that 90.03% of the final grades of students joining in the Foundation of Mathematics courses are B, B+, A- or A, and the percentage of positive responses of students after joining in Foundation of Mathematics courses was 80.0%. Thus it can be concluded that Foundation of Mathematics courses using virtual learning has been successful.
Measuring the capability level of IT governance: a research study of COBIT 5 at Universitas Negeri Gorontalo
Authors: Katili M R , Pateda V , Djafri M G , Amali L N
Published: December 2019

Nowadays, Information Technology Governance (ITG) has been massively performed in various organizations. ITG itself reflects the existence of management and utilization of the IT activities to the achievement of the goals of the organization. Nevertheless, the evaluation of ITG at the Universitas Negeri Gorontalo (UNG) has still not been carried out systematically. To resolve the issue of evaluation efforts required to use the COBIT 5. The purpose of this research is to find out IT governance at UNG and to measure the extent of the capability of ITG at UNG. The approach of this research is descriptive by using quantitative and qualitative data. The results of this study indicate that the level of IT management capabilities at UNG is level 3 (Enablished Process), which means that the IT management process has been carried out following a defined standard process and enabling the achievement of process results. Based on the results obtained, recommended corrective steps can be taken by the organization management so that the level of capability of the DSS and MEA processes can be increased so that IT utilization in UNG becomes more optimal to avoid the risk of failure from IT implementation.
Mobile-Based Media as the Solution in Teaching and Learning Listening Skill
Authors: Elfiona Elsa , Zaim M , Refnaldi
Published: December 2019

Learning listening skill is more challenging for English as a foreign language (EFL) students. Based on an investigation at several high schools in Padang, the existence of listening skill in English subject is almost neglected in teaching and learning process because of many reasons such as the limited media and less opportunity to practice listening. Teachers are difficult to prepare appropriate media to teach listening while students are difficult to find out the appropriate listening materials to practice. Innovation in using media is needed in this era because people use technology such as the computer, smartphone, internet in life. This paper uses library research method that aims to describe such as solution by utilizing mobile phone in teaching and learning listening skill considering almost all students already had their own Smartphone. Based on the study, there are several benefits in using technology especially mobile-based learning in teaching and learning process; increase teachers creativity in designing teaching materials and media, increases students’ motivation in learning, mobility, accessibility, and excellent potential for providing students with the learning materials whenever and wherever. In summary, using mobile-based learning can be a solution to solve several problems in teaching and learning listening.
Development of Reading Materials for Multicultural Education With the Topic of Kasada Tradition in Tengger Community (Study of Ethnography at the Bromo-Tengger-Semeru National Park, Jawa Timur)
Authors: Hadi N
Published: December 2019

A very prominent feature of the Tengger community in carrying out their social activities and customs is the attitude of togetherness which is based on harmony and peace. In carrying out their various sacred ceremonies, the spirit of togetherness is crucial to them. Especially in the Kasada ceremony, they enunciate sincerity, joy, mutual cooperation, sacrifice, and other significant attitudes and behaviors indicating their level of dignity as social beings. The ceremony was held by involving all members of the community, men and women, from the elders to the children. It is believed that the Kasada ceremony is an ancestral heritage, in which there are many important values, and is abundant with noble aspects of everyday social life, especially intertwined with their original religion. The approach used in this study is the qualitative-ethnographic model of Spradley The results show: (1)The Kasada ceremonial tradition is a form of ecological adaptation. Over the years, this community has held the ritual, with the intention of fulfilling many interests, particularly maintaining their existence as mountain farmers. (2)This ceremony is a form of local wisdom in answering limited natural challenges, by cultivating the ability and intelligence in preserving nature and integrated social life. (3) Values in the Kasada ceremony tradition include: willing to sacrifice, help each other, implement mutual cooperation, persevere, respect the work of others, balance the past and the future, love for the preservation of nature, and implement social responsibility; (4) Decided sanctions for Kasada ceremony offenders: there are no legal sanctions, but an anomaly is attached to those who avoid the ritual, that actually strengthens their social integration. This happened to some Tengger people who had embraced State religions.
Implementation of Problem-Based Learning to Improve Critical Thinking Skills in Entrepreneurs Learning
Authors: Hasanah  , Malik Muh Nasir
Published: December 2019

Critical thinking skill is highly required to face the industrial era 4.0 in the 21st century that is integrated into the knowledge, skills and attitudes and mastery of ICT. The purpose of this study was to see the effect of applying Problem Based Learning to improve critical thinking skills in Entrepreneurship learning. This research employed the quasi-experimental method to compare the results of the experimental class treatment with the control class. The design used in this study was the non-equivalent control group design. The sample of this study was students of the Electronics Engineering Education study program at the Faculty of Engineering, Makassar State University who were registered in the entrepreneurship course. The results showed that: (1) the application of Problem Based Learning on Entrepreneurship Learning could significantly improve critical thinking skills, and (2) the application of Problem Based Learning could improve student learning activities.
Reorganizing the Curriculum of the Study Programs of the Electrical Engineering Fields in Universitas Negeri Padang as Its Eminent Policy
Authors: Mukhaiyar R , Mukhaiyar  , Myori DE , Hambali  , Utari N
Published: December 2019

Based on the fact, there are often standard inequalities and curriculum needs made, provided, and used for D3 and D4 study programs. For example, the Electrical Series courses as basic skills courses for student, even each program lectured by the same person, the understanding of each study program’s students on this subject is very different. The initial assumption, this occurs because misunderstanding of each education level with the differences need between vocation and majors courses. So the material given to D3 and D4 is unbalanced. The initial assumption was that the lecturer teams of each study program were too deco-defective towards the category of applied electrical engineering graduation that had to work in the industry, and electrical engineering education which had to become a teacher. For instance, electrical circuit subjects, this course is a basic knowledge in electrical engineering, so it must be shared and delivered to students is the same scientific material. Therefore, this research is very important to be carried out to unite the perceptions and perspectives of the electrical engineering department - UNP along with the lecturer council for the ideal curriculum for a department of educational institutions with the origin of formation such as UNP.
The Effect of Active Learning in the form of Scientific Approach with the Use of Students Worksheet Based on Problem Based Learning (PBL) on Students’ Biological Knowledge
Authors: Laili F , Lufri L
Published: December 2019

The effect of Active Learning in the form of Scientific approach with the use of students worksheet based on Problem Based Learning on Biological students knowledge. This kind of research is quasi-experimental by using research design; Randomized Control Posted only design. The population used here is students of X IPA Senior High School. The technique used is Purpose sampling and Class X IPA 4 act as experimental class whereas X IPA 3 as control class. Instrument that is conducted here is Objective and Essay. Data analysis by using T-Test. The result shows that there is significant differentiation between both class where experimental class knowledge is higher than another one. Average of experimental class students score is 86.74 and another class is 82.00. Based on the result of hypothesis test significant (0.008) < 0.05 so H1 was accepted. The conclusion of this research is Active Learning in the form of Scientific approach with the use of students worksheet based on Problem Based Learning on student enable them to improve their Biological knowledge.
Scientific Literacy of Secondary School Students’ Related the Global Warming Subject
Authors: Rusilowati A , Supriyadi  , Dwijananti P , Khabibah E A N
Published: December 2019

The purposes of this research to describe of scientific literacy of secondary school students related materials of global warming. This research used quantitative descriptive method. The sample research was seventh grade students of secodary school at Central Java, Indonesia. The research instrument used a scientific literacy test in the form of a description that includes four scientific literacy categories that are science as the body of knowledge, science as a way of investigating, science as a way of thinking, and interaction between science, environment, technology, and society. The results showed that the average scientific literacy of students in all categories was 43.39%. Scientific literacy of students in each category obtained a percentage of ≤54% with very less criteria for the science category as a body of knowledge, a way to investigate and a way of thinking. The category of interactions between science, environment, technology, and society is less criteria with average percentage 57.25%. This shows that the scientific literacy skills of SMP and MTs students are still low.
Junior High School Teachers’ Problems in Digitally Infected Clime: The ICT Utilization Sensibility
Authors: Monia F.A. , Hanafi I , Marsidin S. , Darmansyah
Published: December 2019

Nowadays, the digital era which is known as 4.0 era began to endemic the world of education. Teachers as an actors of education get a challenge to adapt with this development. The purpose of this study is to describe the teachers’ problems in using ICT in junior high schools in Bangkinang City. The type of research is descriptive research. The subjects of this study were all 87 teachers in SMP Negeri 1 Bangkinang City. Based on the results of the research, it can be explained that the problems faced by teachers in the use of ICT are 1) the mastery of teachers in the use of ICT is still in the low category, 2) there is no regulations for teachers to implement ICT in the teaching and learning process 3) the lack of training activities to increase the teachers’ ability to use ICT. The alternative solution that can be done is periodically implementing ICT training activities and increasing ICT facilities for teachers.
Educating and mentoring of broiler intensification programs through KKN-PPM activities for the community of Talise Village, Likupang Barat Subdistrict, North Minahasa Regency
Authors: Mege R A , Paus J R , Mantiri J , Maramis A A
Published: December 2019

A community service activity, Kuliah Kerja Nyata – Pembelajaran Pemberdayaan Masyarakat (KKN PPM) in Talise Village, Likupang Barat District, North Minahasa Regency, has been well implemented. The activities aim to provide education and assistance to the community through the application of intensified chicken livestock technology. The target community groups are groups of school-age children (junior high school students and school dropouts) and adult groups. The method used for groups of adults is a combination of methods of applying science and appropriate technology with the adult learning approach (Andragogics), while for groups of school age children using the Scientific Learning approach by utilizing the school yard as a laboratory and learning resource for students. The results achieved are, the community and students get knowledge and skills about: 1) technology for processing alternative animal feed ingredients; and 2) livestock health control technology. Through this activity it has also been facilitated efforts to meet the needs of animal food consumption and increase family economic income.
Effectiveness of Realia Media: A Case Study in SMP Negeri 1 Likupang Barat as a Partner in KKN-PPM Program
Authors: Maramis A A , Mege R A , Paus J R , Mantiri J
Published: December 2019

Communities in Talise Island face various problems, indeed children which has an impact on the high level of school dropouts. Children after school must help the work of parents who generally work as traditional farmers, breeder, or fishermen. Other factors that influence the dropout rate are the learning process and infrastructure which can be said is below national standards. To help alleviate the problems, an activity called Kuliah Kerja Nyata – Pembelajaran Pemberdayaan Masyarakat (KKN-PPM) has been carried out to reduce the number of school dropouts. The real steps taken are to optimize the utilization of existing infrastructure of SMP Negeri 1 Likungan Barat which has a land area of about 2 hectares for livestock farming and revitalize the learning process in schools by applying learning media suitable for the situation and conditions. Through this KKN-PPM activity, college students from the educational study program have implemented media realia in the learning process. Realia media are assistive devices or real objects that are used as teaching materials that can be presented in classrooms or observed directly according to their location outside the classroom. This article will describe the effectiveness of using realia media in SMP Negeri 1 Likupang Barat.
Development of Natural Disaster Mitigation Teaching Materials to Improve Understanding of Disasters
Authors: Alfi M , Darsiharjo  , Maryani E
Published: December 2019

This study has three objectives (1) Developing natural disaster mitigation teaching materials; (2) knowing student learning outcomes when using instructional materials that have been developed (3) Knowing student responses to instructional materials that have been developed. The research method used is Research and Development (R & D). This research was conducted at high school (SMAN) 3 Pariaman to retrieve needs data, test products, and experimental teaching materials. The class sampling technique uses a cluster random sampling technique. The data collection technique is through questionnaires and tests. The results of this study are to produce products in the form of natural disaster mitigation teaching materials according to the needs of students and teachers and have been validated by experts and tested. The experimental results of natural disaster mitigation teaching materials indicate that teaching materials are used effectively in learning. The results of this study are validations consisting of 4.1 instructional review values and 4.0 technical review values, so the results of developed product validation are valid. Based on the analysis of learning outcomes, 72% of students have high category values. This study concluded that the development of teaching materials is valid and can be used as teaching material.
Analysis of The Season Effect on The Shallow Ground Water Parameters using Multivariate Statistics
Authors: Octova Adree , Afrinaldi  , Gusman Mulya , Anaperta Yoszi Mingsi , Ramadhan Fachrul Rozi
Published: December 2019

Problems related to water resources are still a major concern in some regions in the tropical climate. The effect of seasonal changes on the physical parameters of water quality is quite clearly visible. This certainly can pose a serious risk if it takes place in the long term towards human health and the environment without conducting intensive studies. The approach of this study is to draw the relationship between seasonal changes and physical parameters of water quality in 185 points spread across 11 sub-districts. Water parameter data was analyzed using multivariate statistics. Based on multivariate analysis in the dry season, the regression equation Y = 343.482 X1 + 0.039 X2 - 0.016 X3 + 12.961 X4 + 124.773 X5 - 815.208 and rainy season Y = 273.119 X1 + 0.025 X2 + 0.336 X3 + 15.731 X4 + 39.731 X5 - 745.119 (X1 salinity, X2 resistivity, X3 depth, X4 TDS, and X5 temperature, with bound parameters or Y is conductivity). Based on the health standards of the Indonesia Health Ministry concluded that regions showed the zone of extreme changes is close to the coast.
The Effect of Project Based Learning Towards Student Achievement in Electrical Machines and Energy Conversion Subject
Authors: Ambiyar Ambiyar , Afifah Nurzamaliah
Published: December 2019

The purpose of this study was to reveal the project-based learning model with conventional learning models of student learning outcomes. This type of research was quasi experimental research design. Quasi experiments used post-test only design with two random groups for experimental and control classes. The sample in this research was 64 students. The instrument used to measure student learning outcomes is a multiple choice objective test with five option. Data were analyzed using t test. The results of data analysis showed that there were significant differences in the learning outcomes of Electrical Machine and Conversion Energy subjects that were significant between students in the experimental class taught using the project based learning learning model for students in the control class taught by conventional learning models. The average value of experimental class is 82 is higher than the average control class is 73. Based on the above two learning activities, it can be concluded that using the project based learning model further improves students learning outcomes in Electrical Machine and Conversion Energy subjects compared with conventional methods of learning.
The Effectiveness of Teaching Materials using Project Based Learning (PjBL) in Concrete Stones Practice Course
Authors: Syah N , Haq S , Pratama Y F , Sarwandi  , Hutria W , Nofianti L
Published: December 2019

The magnitude of the impact of technological development (Industrial Revolution 4.0) has become a challenge for the world of education to continue to improve, even this situation demands very rapid change, which becomes a serious threat to the world of education, especially the vocational field. There are several problems in concrete rock practice learning such as (low student grades, not yet having teaching materials relevant to the demands of the industrial revolution 4.0, and not optimal use of technology in learning. Research development (R & D) with 4-D models (define, design, develop, disseminate) it aims to answer the challenges of the revolutionary industry 4.0 by creating effective teaching materials and learning strategies with video combination by optimizing the use of technology (smartphone). This research produces module and video that is valid (expert judgment), and effective that can evidenced from the increase in student learning outcomes (average pretest 50.72 and posttest average 86.04). Module teaching materials and video combinations are very suitable to be used for practical learning, especially in concrete stone practice course.
The Effect of Split Ring Resonator (SRR) Metamaterials on the Bandwidth of Circular Microstrip Patch Antennas
Authors: Hariyadi Tommi , Rodiah Nunung , Pantjawati Arjuni B.
Published: December 2019

A microstrip patch antenna is one type of antenna that is currently widely used in wireless communication systems. This antenna is an option because it has several advantages, such as its lightweight, small size and easy to fabricate. However, one of the disadvantages of this antenna is the narrow bandwidth. In this study, bandwidth will be increased in a single circle microstrip patch antenna. This increase in bandwidth aims to make the antenna designed to work for LTE band 3 applications with a frequency range of 1710-1880 MHz. Increasing bandwidth can be done using the Split Ring Resonator (SRR) Metamaterial. Antenna simulation and optimization were carried out using 3D electromagnetic simulator using FR-4 substrate with a thickness of 1.6 mm and a dielectric constant of 4.3. Based on the simulation results, obtained antenna bandwidth of 310 MHz with a frequency range of 1620 - 1930 MHz for return loss of less than -10 dB. The antenna gain is around 2.1-2.5 dBi with directional radiation patterns. It can be concluded that this antenna can be used for LTE band 3 applications.