bluuebunny/crossref_metadata_2025 huggingface dataset:
Detecting anomalies in vector boson scattering *
Authors: Li Jinmian , Yang Shuo , Zhang Rao
Published: April 2021

Measuring vector boson scattering (VBS) precisely is an important step toward understanding the electroweak symmetry breaking of and detecting new physics beyond the standard model (SM). Herein, we propose a neural network that compresses the features of the VBS data into a three-dimensional latent space. The consistency of the SM predictions and experimental data is tested via binned log-likelihood analysis in the latent space. We show that the network is capable of distinguishing different polarization modes of WWjj production in both di- and semi-leptonic channels. The method is also applied to constrain the effective field theory and two Higgs Doublet Model. The results demonstrate that the method is sensitive to general new physics contributing to the VBS.
Design of a scalpel clamp for viscoelastic properties assessment in soft brain tissues
Authors: Silva K N , Torres-SanMiguel C R , Jimenez-Ponce F , Urriolagoitia-Calderón G M
Published: April 2021

Parkinson’s disease (PD) is the second most common chronic degenerative brain disorder in the world preceded by Alzheimer’s disease, affecting one in every hundred people over sixty worldwide. This research shows the evaluation of hydrolyzed collagen specimens that emulate the viscoelastic properties of brain tissue. Also, an electromechanical clamp-type device is proposed for data acquisition as well as a graphic interface that displays samples values.
Optimization and Performance Evaluation of C+L Band Wavelength Division Multiplexing Based on Free Space Optical Communication
Authors: Almukhtar A. A. , Abass A. K. , Ali M. H.
Published: April 2021

In this paper, the design parameters of the wavelength division multiplexing based on free–space optical (WDM–FSO) within the C+L band are optimized via Opti-system 7 computer software. The performance of the proposed system is evaluated under different weather conditions, namely, clear, haze, rain, and fog. The Amounts of 1E-9 and 6 were adopted as a communication condition for B.E.R and Q-Factor, respectively. The W.D.M system operating frequency is ranging from 190 THz –to– 193.1 THz through 32 channels with a channel spacing of 100 GHz and a bit rate of 10 Gbps.
A study of automatic segmentation of White Matter Hyperintensity for detection of Alzheimer’s disease
Authors: Eileen Pious Antonitta , Sridevi U.K.
Published: April 2021

Alzheimer’s disease is a type of neurodegenerative disorders involving a long-term and generally significant decrease in cognitive performance. Age is the main risk factor for neural disorder, and so it is the aged who are highly affected by this neural disorder. Because of the intensity of the spread of this disease on a global level, organizations and researchers are continuing to invest in the early detection and prevention of such disorders, with an emphasis on proper treatment and medication. Cost-efficient and scalable methods for detecting dementia from some of the most extreme ways are required, similar to the early stages of Subjective Memory Loss (SML), to more drastic stages like Mild Cognitive Impairment (MCI) and Alzheimer’s Dementia (AD) itself. The focus of this work is to build a reliable Deep learning algorithm based on the OASIS, ADNI, and WMH challenge dataset for the identification of cognitive impairment (CI).In this paper an elaborate review has been made of the various methodologies and algorithms used in various frameworks to efficiently and automatically segment WMH (White Matter Hyperintensities) in the brain to detect lesions and areas related to various anomalies, Alzheimer’s being one of them.
Geogebra assisted blended learning on students’ spatial geometry ability
Authors: Daulay L A , Syafipah  , Nasution A K P , Tohir M , Simamora Y , Saragih R M B
Published: April 2021

This study aims to know (1) the effect of Geogebra assisted blended learning in enhancing spatial geometry ability, (2) the response of the learning. This research method uses quantitative research with a quasi type experimental design and research design using the pretest-posttest control group. The subject was Mathematics Education students on State Institute of Islamic Religion (IAIN) Takengon who studied field and space analytic geometry in the academic year 2019/2020. Data collection using tests and questionnaires that are validated by experts. The data hypothesis test uses the t-test involving requisite pretests (normality and homogeneity) beforehand. The results showed that Geogebra assisted blended learning was effective in enhancing geometry spatial ability, and students’ response was also very good.
The development of learning tool based on realistic mathematics education and its influence on spatial abilities of elementary school students
Authors: Nuryami  , Sunardi  , Susanto  , Rizqika P , Shofyan A
Published: April 2021

This study aims to develop a learning tool for mathematics based on Realistic Mathematics Education on the volume of block and cube material for grade V of elementary schools and to determine their effect on spatial abilities. Spatial abilities need to be improved since elementary school because spatial abilities are related to students’ cognitive abilities. However, student experience problem in learning about space figures, beside the material is abstract, the learning process in the classroom can also affect it. Mix Method is a method used in this research with a Sequential Exploratory design, a method that combines the Thiagarajan model development and sequential quantitative method. Before the data is analyzed, first the variance homogeneity test and normality test are carried out. The first test results indicate that the data is distributed normally. So that the data were analyzed using t-test analysis. The results showed that: (1) the learning device met the criteria of being valid, effective and practical, meaning that the device was proven to be a guide for teachers to improve spatial abilities, (2) a value of significance of 0.000 (p <0.05), indicating that there is a substantial effect on the application of learning used on students’ spatial abilities.
The development of learning instrument with Contextual Teaching And Learning (CTL) based on Lesson Study for Learning Community (LSLC) on two variable linear equations and its effect on creative thinking of junior high school student
Authors: Solehah A , Pambudi D S , Hobri  , Ummah B I
Published: April 2021

This study aims to develop learning instrument with contextual teaching and learning (CTL) based on lesson study for learning community (LSLC) on the two-variable linear equation material for grade VIII students of Junior High School/MTs and its effect on students’ creative thinking. The method used is mix methods with a combination model of sequential exploratory design with the Thiagarajan development model through four stages, those are define, design, develop, and disseminate. In experimental research using a quasi experimental design, namely pretest posttest non equivalent control group design. The subjects of this study were students of MTs Bustanul Ulum Panti, class VIIIA as the experimental class and class VIIIB as the control class. Students’ creative thinking abilities were measured using tests of creative thinking abilities. The assumption test for normality and homogeneity of variance is carried out before the data is analyzed. This research generates learning instrument that meet the criteria of practical validity, and effective, also the significance value (t-tailed) of 0,000 (p < 0,05) which indicates the application of learning has a significant effect on students’ creative thinking abilities.
Influence of lower-order derivatives on solvability Dirichlet problem for elliptic systems
Authors: Golovko E A
Published: April 2021

The article considers the Dirichlet problem for a multidimensional elliptic system containing lower-order derivatives. At the present time elliptic systems of second-order partial differential equations with two independent are well known, what cannot be said about multidimensional elliptic systems. The problem of homotopy classification of such systems has not yet been solved. For elliptic systems phenomena are observed in the nature of the solvability of classical boundary systems, which do not occur in the case of one equation. Among such phenomena, the influence of the loss of smoothness and the influence of lower-order derivatives on the solvability of boundary value problems should be noted. The paper proposes a solution to the Dirichlet problem for a multidimensional elliptic system with lower-order terms of a special form in a half-space. Applying the Fourier transform, the solvability problem is reduced to study of a second-order partial differential equation containing lower-order derivatives. Violations of the violation of the Noetherian property of the Dirichlet problem are considered. The result is formulated as a theorem.
New selection algorithm based on generating sequences
Authors: Artamonov Y N , Alyaeva Y V
Published: April 2021

The paper proposes a new deterministic selection algorithm with computational complexity O(n), called cs-select, which is a modification of the quickselect algorithm. The changes concern the selection of reference elements. Instead of selecting some elements of the sequence itself as References, the cs-select algorithm proposes to use finite segments of complete sequences, that allow to represent any natural number in a given range as the sum of elements from a selected finite segment of the complete sequence. It is theoretically justified that in the cs-select algorithm, the number of comparisons when searching for the k-th statistic in a sequence of length n can converge to the value 2n with unlimited growth of n for some complete sequences. It was also shown that different variations of the complete sequences make it possible to reduce the latent constant in O(n) less than 2.
Encoding and decoding algorithms for unlabeled trees
Authors: Balagura A A , Kuzmin O V
Published: April 2021

Trees considered in this article, in which at least two receivers emanate from each internal vertex, are found in the works by E. Schroder, R. Stanley, O.V. Kuzmin, etc. Encoding and decoding algorithms for unlabeled planar rooted trees with a given number of end vertices, root receivers, and a sequence of degrees of internal tree vertices during depth-first search are built. Encoding is done in non-decreasing tuples, by assigning labels to the internal vertices of the tree. The proposed algorithms made it possible to prove the existence of a one-to-one correspondence between the studied set of trees and the set of non-decreasing tuples. To find the cardinality of a set of tuples, we used an approach based on the generalized Pascal pyramid.
An operational method for calculating the frequency fluctuations of a radio signal in a randomly inhomogeneous ionosphere
Authors: Ch Kim D , Ageeva E T , Afanasiev N T , Chudaev S O , Mahro I G , Medvedeva O I
Published: April 2021

An operational method for calculating fluctuations of the Doppler frequency shift of a radio signal reflected from a randomly inhomogeneous ionosphere is proposed. The method is based on a numerical and analytical solutions of stochastic ray equations. The integral expressions are obtained for the average and root-mean-square deviations of the frequency of the radio signal along the oblique sounding path in the approximation of the perturbation method. The motion of chaotic ionospheric irregularities is taken into account in the framework of the hypothesis of the frozen turbulence transfer. The integral expressions for statistical moments are reduced to a system of ordinary differential equations of the first order and are solved numerically together with the ray equations in the regular ionosphere. This can significantly reduce the computer time spent calculating the Doppler frequency shift of the radio signal in a randomly inhomogeneous ionosphere. The results of mathematical modeling of frequency fluctuations of a decameter radio signal on a single-hop track in various geophysical conditions are presented.
Computer simulation of processes of changing the reliability characteristics of systems with recoverable and non-recoverable elements based on the Simulink Dynamic Simulation Package
Authors: Krivel S M
Published: April 2021

The paper presents a methodology and software package of mathematical and computer simulation of changes in the reliability characteristics and integrated indicators of system reliability during operation using Simulink. The software package is an application (Toolbox) to the standard Simulink package. The theoretical basis of the proposed algorithms is the method of analyzing structural diagrams of system reliability. The author proposes an original diagram of building a mathematical model of reliability with both non-recoverable and recoverable elements. The diagram involves a broad interpretation of the concepts of a “recoverable element” and a “recoverable element failure”. This approach found reflection in the wide range of proposed simulation tools. The advantage of the proposed products is the unification and relative ease of building models of systems of a sufficiently high level of complexity, and a wide range of intermediate simulation results available for analysis. The methodology and software package can be used during the system design stage to predict their reliability performance. The paper presents some simulation results.
The effective potential approach in the limit model of an uninsulated vacuum plane diode
Authors: Sinitsyn A V , Arguchintsev A V , Kedrin V S
Published: April 2021

Computational aspects of a vacuum plane diode simulation in a magnetic field are considered. The e efficient potential approach is proposed. Results of computational experiments are given.
Reaction of N-allenyl-1H-pyrrole-2-yl-carbaldehyde with hydroxylamine: a quantum-chemical model
Authors: Teplyashin N V , Bobkov A S , Vitkovskaya N M
Published: April 2021

The mechanism of the reaction between hydroxylamine and N-allenylpyrrole-2-carbaldehyde has been studied using quantum-chemical methods (B2PLYP-D2/6-311+G**//B3LYP/6-31+G*). It is shown that the calculations should take into account the solvent molecules. Solvent molecules provide both proton transfer and adequate reproduction of activation barriers. It is found that two solvent molecules are necessary for modeling oximation reaction, whereas only one solvent molecule is sufficient for the cyclization step.
Extraction of bixin from annatto seeds with microwave
Authors: Erdawati E , Allanas E , Wesnina W
Published: April 2021

This study aims to determine the effect of extraction time (5,10,15 minutes) and the ratio of the aquadest solvent: ethyl acetate (1: 6.5, 1: 7, 1: 8 v/v) to the yield of pigment. The optimum condition was found in the ratio of the solvent of distilled water: ethyl acetate (1: 7 v/v) extraction time of 15 minutes with low microwave power resulted in maximum pigment yield of 0.469%. The isolate compounds were analyzed using IR spectroscopy, mass spectroscopy, and High-Performance Liquid Chromatography (HPLC) showed that the isolates were boxing pigments having a molecular weight of 394 g/Mol with wavenumbers for OH groups, C = O carboxylate groups, CH bonds, duplicate C = C, and CO ester bonds. As well as showing the retention time of standard and standard pigments at minutes to 12.849 and 12.843.
Tyrosinase inhibitory activity of Garcinia daedalanthera Pierre
Authors: Ambarwati N S S , Elya B , Desmiaty Y , Ahmad I
Published: April 2021

The tyrosinase enzyme catalyzes the first stage in two reactions in the synthesis of melanin (the hydroxylation of l-tyrosinase becomes 3,4-dihydroxyphenylalanine (l- DOPA) and oxidation from L-dopa to dopaquinone). Hyperpigmentation in human skin is a general phenomenon that is not desirable. Researchers were encouraged to identify potential new tyrosinase inhibitors for cosmetics, especially anti-hyperpigmentation. This study purposed to determine the inhibitory activity of the tyrosinase enzyme from Garcinia daedalanthera Pierre leaves. The extract was obtained by maceration successively method. The anti-tyrosinase assay used the spectrophotometric method at 490 nm. The enzyme used tyrosinase from mushrooms lyophilized powder (Sigma), and the substrate used 3,4-dihydroxy-L-phenylalanine, L-DOPA (Sigma). The tyrosinase inhibitory assay results of 100 ppm (triplicate) showed the leaves extract, including ethyl acetate extract of 33.42 ± 5.98 %, hexane extract was 50.67 ± 0.47 %, and methanol extract of 50.68 ± 1.87 %, respectively. Moreover, the stem bark has activity as follows methanol extract of 43.76 ± 1.41 % and the ethyl acetate extract of 55.71 ± 2.80 %. Percentage inhibition of the positive control (kojic acid) was 65.07 ± 0.03 % at 100 ppm.
Effect of spacing on growth and yield of several black soybean varieties (Glycine max L Merril)
Authors: Maulana K , Yuliartini M S , Wirajaya A A N M , Mahardika I B K , Situmeang Y P
Published: April 2021

This research aims to determine the growth response and yield of several Black Soybean varieties in several variations of spacing. The experiment is a factorial experiment using a randomized block design (RBD) consisting of two treatment factors, the first factor is the variety consisting of 3 levels: V1 = Detam 1, V2 = Detam 3 Prida, V3 = Detam 4 Prida. The second factor is spacing which consists of 3 levels: J1 = 20 cm x 20 cm, J2 = 20 cm x 30 cm, J3 = 20 cm x 40 cm. The interaction of varieties with plant spacing has a very significant effect on crop dry weight and seed oven per planting hole. The significant effect the yield seeds of dried and oven per hectare. The weight of oven-dry seeds per planting hole and the highest yield of oven-dried seeds per hectare was obtained in the interaction of Detam 1 varieties with the spacing of 20 cm x 40 cm with was 33.79 g and 2.53 tons per hectare which increased 138.79% and 42.93% compared with the interaction of Detam 4 Prida varieties with a spacing of 20 cm x 20 cm with was 14.15 g and 1.77 tons per hectare.
Elastase inhibitory activity of methanol extract and n-hexane extract of Garcinia xanthochymus Pericarp
Authors: Desmiaty Y , Ambarwati N S S , Elya B , Atmanto D , Ahmad I
Published: April 2021

Garcinia xanthochymus is a plant found in Indonesia and rich in quercetin. Ethanol extract of bark can reduce LDL levels. Xanthon from the G. xanthochymus has antidiabetic activity. This study aims to determine the anti-elastase activity of n-hexane extract and methanol extract of G. xanthochymus pericarp. Samples were macerated for one time 24 hours using n-hexane and methanol, respectively. The elastase enzyme inhibition test used spectrophotometry methods by reacting extracts with the porcine pancreatic elastase enzyme and using the substrate N-Succ-(Ala)-3-p-nitroanilide (SANA). Absorbance was measured at a wavelength of 405 nm with a microplate reader. The results showed that the concentration of 100 ppm extract of n-hexane extract of pericarp had enzyme inhibiting activity 65.17 ± 6.44%, methanol extract of pericarp 29.81 ± 10.67%. Meanwhile, the inhibitory activity of quercetin elastase enzyme as a positive control was 62.75 + 1.89%. This research concludes that the n-hexane extract of the pericarp of G. xanthochymus has activity as an inhibitor of the enzyme elastase is very high and can potentially be used as a material for making cosmetics.
Comprehensive study of SIR: Leading SUT repository for software testing
Authors: Min J L , Rajabi N , Rahmani A
Published: April 2021

Software testing is performed by executing test cases against the system under test (SUT). For researchers, it is slightly challenging to find real case SUT. As an alternative, researchers utilize the existing SUT from repositories as their research objects. Software-artifact Infrastructure Repository (SIR) provides some reasonably comprehensive SUTs that had been used by over 50% of software testing literature. Nevertheless, it is still rare among researchers to conduct profound studies of SIR’s SUTs. This paper aims to fill the gap by explaining SIR’s SUTs specification and how it’s organized. Each of the C-language SUT was exposed and recorded its features comprising the size of SUT, lines of code (LOC), number of test cases, as well as the number and types of faults. SIR’s SUTs divided into two parts namely “older” and “newer” objects which both provided with various versions of the test program as well as predefined test sets along with its specification. These results indicate that SIR’s SUTs is carefully prepared to conduct software testing research.
Development of digital engineering learning with proteus software media and emulators department of informatics engineering Kanjuruhan University
Authors: Syahminan S , Hidayat C W
Published: April 2021

Proteus professional is a group of electronic software used to assist designers in designing and simulating a circuit electronically. This software has two functions at the same time in one package, one package as software for drawing automatic schematics and can be simulated which is named ISIS. The second package is used to design the Printed Circuits Board (PCB) image which is named ARES. Directly, the conversion from schematic to PCB can be done in this Professional Proteus software. Prof. ISIS Proteus has always friendly versions, starting from version 7.0 to 8. Each version increase with the addition of library components that can be taken and used in drawing or designing. As an electronic frame designer, he first used ISIS as a medium that made it easier to play and simulate. A large number of libraries of the Proteus Professional ISIS on ISIS software is said to be a complete simulation software, namely from active components, Analog, Transistor, SCR, FET, types of buttons, types of switches/relays, digital ICs, amplifier ICs, programmable ICs (microcontroller) and IC memory. Apart from being supported by complete components, it is also supported by the completeness of measuring instruments such as voltmeters, ampere meters, oscilloscopes, signal analyzers, and frequency generators. The completeness of the features provided makes Proteus Professional ISIS into an electronic simulation software Emulator writer is a service text media for writing programs, especially using digital number codes, and can be collaborated with proteus, which is a window form media designed by the author to make it easier for beginners who want to learn about microcontroller programming, can be used to write programming/coding with code Binary and Hexa numbers are made in Indonesian with the aim that beginners who are just starting to learn about digital-based programming if there are errors in writing, instructions, or writing procedures, it will be shown in an Indonesian warning.
Android game: Education Javanese vocabulary
Authors: Wijayanti R , Muntomimah S , Khoirunnisak R
Published: April 2021

The research aim to develop android games for use in learning Javanese vocabulary for children age 5 (five) to 6 (six) years. Methods used in android game development use models research and development (R&D) with ADDIE development model. Use 5 stages: analysis (analysis), Design (Design), Development (production), Implementation (Implementation) and Evaluation (Evaluation).The result of this development is an android game named “Sinau Basa Jawa”. Android Game contains interesting features in the form of agency or control, interactivity, feedback, curiosity challenge, identity, immersion, fantasy. With 2D graphic evolution. The results of this study were tested toward media experts, early childhood education specialists, Javanese language expert, kindergarten teacher. The quality of this media product is seen from the aspect of material and media feasibility. The result with media outcomes that are declared very feasible. Android game “Sinau Basa Jawa” very suitable applied for education Javanese language. android game can help teacher and parents teaching Javanese vocabulary to children.
Development of math education comics through digital android
Authors: Kusumadewi R F , Neolaka A , Yasin M
Published: April 2021

This research aims to develop mathematics education comics through digital android. This type of research is a combined RND research from Brog and Gall and MPI. The product was developed through several stages by manually designing, scanning, providing colour with photoshop, giving text balloons after that the process of digitizing android is done using PowerPoint, Ispring and Web2APK which can be operated through android, gadgets offline and online. The evaluation of this product was assessed by several experts namely experts in language, material, graphic design and colleagues. Data collection techniques using a questionnaire and then analyzed descriptively quantitative. The results of the assessment of experts get good criteria from several expert validators, language, material, and graphic design conclude that this product is feasible to use.
Solving interval linear system using gradient vector
Authors: Setyadi N , Hadi I , Agustine D
Published: April 2021

In this paper we represent an algorithm for finding the interval solution using gradient vector. This algorithm applies the optimization problem based on gradient vector in order to obtain the lower bound and upper bound of the interval solution. In this method, initial solution has been used with stopping criteria to compute the solution. An example problem is solved to represent this method with μ=0.5, μ=0.1, μ=0.05, and μ=0.01. By this method, we obtain optimal numerical solutions results with μ=0.01.
Massive Open Online Simulation (MOOS) of physics concepts microscopic for improving creative thinking
Authors: Astra I M , Wibowo F C , Susanti D , Darman D R
Published: April 2021

Physics consists of concepts that are macroscopic and microscopic, physics concepts that are microscopic or Physics concepts that are invisible or unobservable. If the phenomenon that is microscopic can be understood then the macroscopic phenomenon will also be easy to understand. This research aims to produce a Massive Open Online Simulation (MOOS) online course on microscopic concepts that enhances creative thinking. The research method used was Embedded Experiment Design with research subjects being 60 high school students at one campus in the province of Jakarta, Indonesia. The results showed MOOS of Physics Concepts Microscopic for Improving Creative Thinking with average normalized gain score  creative thinking increased by 0.54 with the medium category. These results indicate that MOOS on microscopic concepts increases students’ creative thinking.
The volcanic ash dispersion simulation of Soputan with PUFF Lagrangian method
Authors: Delina M , Oktafiandariento T S , Fahdiran R
Published: April 2021

Volcanic ash is dangerous for aviation because it can harm the plane engine. This study built a simulation of volcanic ash dispersion of Soputan in Indonesia, which erupted in December 2018 with the combination of the PUFF and Lagrangian methods. These combination methods gave a better result because it included the advection, diffusion, sedimentation vector, the geographic factor, wind area, eruption time and duration, and lifetime particle in the air. The simulation result was compared with the satellite image from Volcanic Ash Advisory and calculated the area ratio (AR) as well as the angular deviation (α).
Augmenting the spatial resolution of climate-change temperature projections for city planners and local decision makers
Authors: Jijón Juan Diego , Gaudry Karl-Heinz , Constante Jessica , Valencia César
Published: April 2021

Before the 2010, studies in climate change (CC) projections embracing scales below 3° were difficult to find. This has changed dramatically over the past ten years, with literature addressing high resolution grids for climate studies, allowing a better understanding and forecasting of CC at finer scales. However, downscaling methods remain poorly explored in urban planning. Research shows that the main difficulties relate to mismatches between data needs and data availability, terminology, constraints of information technology and maps that inform spatial planning decision-making processes. Based on dynamic downscaled maps for RCP 4.5 and RCP 8.5 at 10 km resolution published by Ecuador’s Ministry of Environment and Water (MAAE), we develop a method for augmenting the resolution scale at 30 m. We use digital elevation models and Landsat 4/5/7/8 satellite imagery for land surface temperature (LST) and present a series of steps and equations before applying Stefan Bolzman’s law. We present the necessary equations between the filling-in of LST outliers, and their projection onto air temperature at 2 m height, taking surface emissivity estimates based on (Alves et al 2017 J. Hyperspectral Remote Sens.
7 91–100). We extrapolate the resulting air temperature in time with Fourier’s series, and for the purpose of coherence among scales, we upscale air temperature maps at 30 m to those at 10 km resolution. The resulting CC projection maps are validated with the temporal series of air temperature (max, min, mean) from the meteorological station in the Ecuadorian city of Portoviejo (Student’s t-test) for the period between 1981 and 2005, with Portoviejo city facing temperature increases of up to 2 °C under RCP 4.5 scenario in the period 2011–2040 vs 1981–2005. The final CC maps have an augmented resolution of 30 m, are compatible with those of MAAE, and offer a low-cost procedure for informing land-use and urban planners, as well as local development decision makers, of temperature anomalies due to climate change.
Assessing community coping capacity in face of tsunami disaster risk (case study: sumberagung coastal area, banyuwangi, east java)
Authors: Irawan L Y , Sumarmi  , Bachri S , Sholeha A W , Arysandi S A , Dirgantara S D , Devy M M R , Prasetyo E B , Febrianto A D , Rosyendra M G
Published: April 2021

This research aims to assess community coping capacity especially in implementing post-tsunami disaster mitigation and adaptation in the coastal environment of Sumberagung Village. Sumberagung Village is a vulnerable area exposed to the tsunami. The past tsunami in 1994 has caused many losses to the people at Pancer Beach and Pulau Merah Beach. More than 200 people were dead at Pancer Beach. Data collection techniques on this research could be divided into two; primary data and secondary data. Primary data is obtained by conducting field surveys and in-depth interviews with the local inhabitants. While secondary data is obtained through relevant government agencies such as the Regional Disaster Management Agency (BPBD), Village Monograph Data, and Statistics Agency Bureau (BPS). Data identification was carried out in a qualitative descriptive manner by adjusting the findings of the field with the study of existing theories. The results of the study indicate that in general the appeal for the threat of a tsunami disaster has already existed but has not been comprehensive. On the other hand, not all of the inhabitants have not taken many lessons learned from the 1994 tsunami. Adaptation in the form of shelter that is safe from the threat of a tsunami has not been seen by residents in Pancer Beach. This field condition shows that after the 25 years of the tsunami event, the local residents have not been fully able to implement a mitigation strategy, especially on emergency.
Unmanned aerial vehicle (uav) application for supporting climate change readiness program in depok municipality, indonesia
Authors: Hernina R , Rosyidy M K , Ashilah Q P , Bassayev M H , Huda D N , Pratama A A , Putra T A
Published: April 2021

In 2019, Depok Municipality in Indonesia has participated for the second times in PROKLIM (Program Kampung Iklim-bahasa) which is focussed in RW 10 Baktijaya Village. In previous year, community activities in biopori holes, family herbal planting (TOGA) and rainwater infiltration well (RIW) was difficult to be updated. Therefore, in this study unmanned aerial vehicle (UAV) is applied to acquire location of PROKLIM in Baktijaya village with very high resolution image. Herein, DJI Phantom 4 Pro was flown at 100 m height to capture images of participated houses. The image from UAV then processed with Agisoft Photoscan to generate orthophoto image. With the guiandce from local community leader, biopori hole, TOGA and RIW locations were tagged using Avenza Maps and input into ArcGIS. Layers from UAV images and field survey then integrated to produce maps of biopori hole, TOGA and RIW activities. The map of PROKLIM activities was successfully generated from UAV image and Avenza Maps application. Resulted maps are very useful for updating submission to PROKLIM registration website in Indonesia’s Ministry of Environment and Forestry.
Updated Geologic Structures and Stratigraphy of the Darajat Geothermal Field in Indonesia
Authors: Intani Rindu Grahabhakti , Wicaksono Satrio , Golla Glenn , Suryantini
Published: April 2021

The main objectives of the evaluation of the geologic structures and stratigraphy of the Darajat geothermal field are to refine and update both the Darajat conceptual and geologic1 models. Re-interpretation of the borehole image logs, additional petrographic analysis of rock cuttings and cores, integration of subsurface data from the wells drilled during 2009-2011, and recent resource observations allowed definition of at least seven (7) lithologic units based on the dominant rock type. The updated stratigraphy of the reservoir was correlated with the surface rocks to develop a volcano-stratigraphy and geochronology of the Darajat geothermal system. The andesite-intrusive complex, which comprises the Darajat geothermal reservoir and the hypothesized sub-volcanic portion of an earlier liquid-dominated geothermal system, belongs to the Kendang Volcanics and makes up subsurface Units A and B. The interpretation of the major volcano-tectonic features and structures at Darajat was refined through the analysis of the Light Detection and Ranging (LIDAR) data/imagery that was acquired in 2014. The LIDAR Digital Elevation Model (DEM) hill-shade map shows several conspicuous volcanic vents in Puncak Cae, Gagak and Kiamis. The prominent Kendang Fault, which extends to the Kamojang Field in the northeast, might be a section of the ring structure of an earlier volcano, herein, called Kendang. Wellbore image data from several wells suggest that the Kendang Fault may dip at 70° eastward. Although needing further substantiation, we hypothesize that the decompression event that preceded the development of the steam-dominated geothermal reservoir at present might be related to the eruption of the Kendang volcano. The Gagak Fault is another prominent surface structure and believed to form during the eruption of the resurgent Gagak volcano after the eruption of the older Kendang volcano.
Multi-response optimization of machining factors in pocket milling of AISI304 using grey relational analysis
Authors: Rajyalakshmi M , Rao M Venkateswara
Published: April 2021

Pocket milling finds applications in ship building and aerospace industries. To cut the required profile of the pocket on the material various tool trajectories may be used. Surface roughness is one of the quality parameters to accept products at the same time production time must be reduced to reduce the production cost. This shows the need of selecting the best parameters machining parameters to get good surface finish with less production time. Tool trajectories also play a vital role in pocket generation and production time. In the current study, first, optimum machining parameters are identified for AISI304 using Taguchi L9 Orthogonal Array and Grey Relational Analysis. Experiments are done with Speed (S), Feed (F) and Stepover (SO) as the influencing parameters. Secondly, suitable tool path is to be identified to improve the surface quality (SR) and Material Removal Rate (MRR). Two tool paths viz, follow periphery and zigzag are used to generate pockets. For each tool trajectory, from the obtained results, Grey Relational Grade is calculated. The combination of parameters with highest Grey Relational Grade is identified as the optimal parameters. Confirmation experiments indicate that predicted responses are closer to the optimal values.
Hydrodynamic Performance of Positive Surface Textured Patterns under Mixed Lubrication
Authors: Peddakondigalla Venkateswara Babu , Veeranapu Kiran Kumar , Syed Ismail , Boggarapu Vasavi
Published: April 2021

It is proved that the optimal design of surface textures (positive or negative) improve the lubrication performance by generating extra hydrodynamic pressure at the interface of the sliding pairs. In the present work, the effect of various positive surface textures on hydrodynamic performance of parallel sliding contact under mixed lubrication is researched. The modified Reynolds equation and asperity contact model are solved simultaneously to assess the hydrodynamic pressure and minimum film thickness for different shape of textures. The results depict that elliptical shaped texture generate high hydrodynamic pressure as well as minimum film thickness at the conjunction than the other texture shapes.
Optimization Of Process Parameters In 3d Printing-Fused Deposition Modeling Using Taguchi Method
Authors: Sumalatha M , Malleswara Rao J N , Supraja Reddy B
Published: April 2021

3D printing or Rapid Prototyping (RP) or Additive Manufacturing (AM) is an innovative manufacturingmethod that is mostly used for prototypes in various Industries such as Aerospace, Defense, Medical, Automotive, etc. One of the worthy and widely used 3 D printing techniques is Fused Deposition Modeling (FDM), which involves adding melted material layer by layer. FDM has several benefits over other manufacturing methods. While setting the 3 D printing options, we have to take several parameters into account, such as speed, layer thickness and infill density, etc. The present experimental work illustrates the performance of ABS built parts fabricated by AION 500 make FDM machine. The quality of parts produced by FDM process mainly depends on the selection of process parameters. The present research work consists of process parameters such as layer thickness, infill density and speed of deposition, etc. This study aims to find effects of process parameters on different performance parameters i.e., mechanical considerations (impact strength), build time, surface roughness in a systematic manner with less number of experimental runs. Taguchi design of experiment (DOE) approach has been used to save cost and time of experimentation. Statistical significance of process parameters is analyzed using analysis of variance (ANOVA). The significant parameters for optimum results and optimal parameter setting has been suggested using S/N ratio.
Effect of Number of Passes on Surface Properties of Burnished Aluminium Alloy
Authors: Bhavani Koona , VenkataRamana V.S.N. , Rahul  , Vikas K. Sri Ram , Reddy Ch. Kishore
Published: April 2021

Basically, roller burnishing process is one of the surface finishing processes. In this process, a hard and highly polished roller will be pressed against a rotating specimen, this causes plastic flow on specimen surface from the peaks of surface irregularities into the valleys, which results in a reduction in the surface roughness considerably. This is a type of cold working whichalso results in improvementof micro-hardness, refinement of microstructure on the surface of the specimen under consideration. This work aims to understand the versatility of roller burnishing processand to understand the effect of the number of burnishing passes to enhance surface properties. Surfaceroughness, electrical conductivityand microhardness were studied in the present work. Experimental work was done on aluminium AA7075-T6 alloy. The parameters under which the burnishing was done were burnishing force, spindle feed and speed and are kept constant in the present work.
Effect of Cerium Oxide Nanoparticles Additive Blended in Palm Oil Biodiesel as Alternative Fuel Used in Diesel Engine
Authors: Rao T Srinivasa , Babu Rao H Suresh , Jilani S A K , Mutluri Avinash
Published: April 2021

In the present study, the effects of adding of cerium oxide (CeO2) nanoparticle additive as a fuel additive to a palm oil biodiesel-diesel fuel blend on engine performance, and exhaust emissions were studied in a single cylinder four stroke diesel engine under different torque conditions. The test fuels used were fossil diesel fuels, B20 blend biodiesel (as 20% biodiesel and 80% diesel) with cerium oxide (CeO2) nanoparticle additive (30ppm, 60ppm, 90ppm and 120ppm). The experimental results demonstrated that B20 blend biodiesel at 90ppm of CeO2 nanoparticles additive found significant reduction emissions nitrogen oxide (NOX), carbon dioxide (CO), unburnt hydrocarbons (UBHC) and smoke. However, brake specific fuel consumption (BSFC) is decreased with significant from increased brake thermal efficiency (BTE) by doping of CeO2 from 30ppm to 90ppm. B20 biodiesel blend with 90ppm of CeO2 nanoparticles additive as optimum blend out of the test blends.
Case Studies on Condition Assessment and Repairs for Fire Damaged Reinforced Cement Concrete Structures
Authors: Yenigalla Raja Veerendra , Sajja Satish
Published: April 2021

In India, the shift in the mode of construction of structures from load bearing walled to framed, started in the early eighties. Concrete is highly durable and has very good compressive strength, but is expensive compared to the materials used for load bearing walled structures. Inspite of the cost, since the durability is more, most of the structures being constructed are RCC structures. However, concrete structures are damaged due to the action of fire. Though concrete has good resistance to fire, it is not completely fireproof. This study presents two case studies on structures damaged by fire. The condition assessment, Non Destructive Testing for quality evaluation of the concrete and the suggested repair techniques are discussed.
Stabilization of Expansive Soil by Using Lime and Reinforcement With Geo-Textile
Authors: Malathi N , Komala D.N , Shabeena Sk , Jaya Saahithya V. C
Published: April 2021

Expansive soils are those soil which have high rate of swelling. Hence the improvement of the soil properties has to be done. In this study, we are using of lime and geo synthetic material for stabilization of soil. Lime is an efficacious product to be mixed with fine grained soils with high plasticity and it improves certain properties of soil due to its chemical action. Stabilization of expansive soil with geo-textile will increase the stiffness and load bearing capacity of the soil through frictional interaction between the soil and geo-textile material. The lime is mixed in different percentages and reinforced with geo-textile by placing at certain depth with in sample height of four layers. In conclusion it shows an improvement of strength is in terms of CBR and peak load.
Leading edge topography of blades–a critical review
Authors: Wood Robert J K , Lu Ping
Published: April 2021

In turbomachinery, their blade leading edges are critical to performance and therefore fuel efficiency, emission, noise, running and maintenance costs. Leading edge damage and therefore roughness is either caused by subtractive processes such as foreign object damage (bird strikes and debris ingestion) and erosion (hail, rain droplets, sand particles, dust, volcanic ash and cavitation) and additive processes such as filming (from dirt, icing, fouling, insect build-up). Therefore, this review focuses on the changes in topography induced by during service to blade leading edges and the effect of roughness and form on performance and efforts to predict and model these changes. The applications considered are focused on wind, gas and tidal turbines and turbofan engines. Repair and protection strategies for leading edges of blades are also reviewed. The review shows additive processes are typically worse than subtractive processes, as the roughness or even form change is significant with icing and biofouling. Antagonism is reported between additive and subtractive roughness processes. There are gaps in the current understanding of the additive and subtractive processes that influence roughness and their interaction. Recent work paves the way forward where modelling and machine learning is used to predict coated wind turbine blade leading edge delamination and the effects this has on aerodynamic performance and what changes in blade angle would best capture the available wind energy with such damaged blades. To do this generically there is a need for better understanding of the environment that the blades see and the variation along their length, the material or coated material response to additive and/or subtractive mechanisms and thus the roughness/form evolution over time. This is turn would allow better understanding of the effects these changes have on aerodynamic/ hydrodynamic efficiency and the population of stress raisers and distribution of residual stresses that result. These in turn influence fatigue strength and remaining useful life of the blade leading edge as well as inform maintenance/repair needs.
Conformation tuning of simple non-fused electron acceptors via oxygen and sulfur substitutions and its effects on photovoltaics
Authors: Yao Zhenghui , Li Yaokai , Li Shuixing , Shi Minmin , Chen Hongzheng
Published: April 2021

By altering the number and position of oxygen and sulfur substitutions, four simple non-fused electron acceptors, PTO-4F, PDO-4F, PDS-4F and PTS-4F, were synthesized via feasible two-step reactions. These four acceptors serve as good molecular models to investigate the heteroatom effects on performance of organic solar cells (OSCs) based on their blends with typical polymer donor PBDB-T. The quantity of intramolecular noncovalent bonds, conformation of the molecules and performance of OSCs can be easily adjusted. Gradually increasing oxygen atoms could influence the intramolecular noncovalent (O⋯S, O⋯H) interactions, backbone planarity, film morphology, and electrical and photovoltaic properties significantly. When replacing O atoms with S atoms, the torsional angle of the backbone increases from 3.5° to 97° owing to the reduction of O⋯S attractive coulomb interaction and/or O⋯H hydrogen bonding interaction. With increasing oxygen atom numbers, the absorption is red-shifted gradually and the energy levels are lifted. As a result, the power conversion efficiency of the device increases from 4.06% (PTS-4F) to 6.81% (PTO-4F). This study provides helpful molecular design guideline for the optimization of simple non-fused acceptors and device performances by finely controlling the weak intramolecular noncovalent interactions and molecular conformations.