bluuebunny/crossref_metadata_2025 huggingface dataset:
A variational calculation of vibrational levels of vinyl radical
Authors: Wang Xiao-Gang , Carrington Tucker
Published: May 2020

We report the vibrational energy levels of vinyl radical (VR) that are computed with a Lanczos eigensolver and a contracted basis. Many of the levels of the two previous VR variational calculations differ significantly and differ also from those reported in this paper. We identify the source of and correct symmetry errors on the potential energy surfaces used in the previous calculations. VR has two equivalent equilibrium structures. By plotting wavefunction cuts, we show that two tunneling paths play an important role. Using the computed wavefunctions, it is possible to assign many states and thereby to determine tunneling splittings that are compared with their experimental counterparts. Our computed red shift of the hot band at 2897.23 cm−1, observed by Dong et al. [J Chem. Phys. 128, 044305 (2008)], is 4.47 cm−1, which is close to the experimental value of 4.63 cm−1.
Local-scale tree community ecotones are distinct vegetation types instead of mixed ones: a case study from the Cerrado–Atlantic forest ecotonal region in Brazil
Authors: Souza Cléber R. , P. Paula Gabriela G. , Mendes Carolina N. , Maia Vinícius A. , Aguiar-Campos Natália , C. Araújo Felipe , Mariano Ravi F. , Oliveira Henrique F. , Morel Jean D. , Santos Rubens M.
Published: May 2020

The aim of this study was to evaluate the vegetation identity of local-scale ecotones and its importance to landscape biodiversity in a transition between savanna and forest vegetation types in Brazil. We surveyed the tree community (diameter at breast height ≥5 cm) within 25 plots of 400 m2 across three core vegetation types and two ecotones among them (totalling five vegetation types). We then evaluated similarities in species composition, community structure and phylogenetic diversity across the transitions in order to assess the relationship between the ecotones and the core areas. Ecotones were distinct floristic units with a high number of unique species and floristic and phylogenetic clustering, and hence these environments are additional vegetation types in relation to the core areas. Some species showed maximum abundance in ecotones, which harboured distinct ecological patterns, demonstrating the importance of the ecotones in the overall ecosystem. Results are related to the distribution of the species present in the regional pool across local-scale microhabitats, with ecotones being a product of a distinct environmental conditions resulting from the distinct adjacent biomes (savanna and forest), which enable the maintenance of biological diversity.
PI(4,5)P
2
-dependent regulation of exocytosis by amisyn, the vertebrate-specific competitor of synaptobrevin 2
Authors: Kondratiuk Ilona , Jakhanwal Shrutee , Jin Jialin , Sathyanarayanan Udhayabhaskar , Kroppen Benjamin , Pobbati Ajaybabu V. , Krisko Anita , Ashery Uri , Meinecke Michael , Jahn Reinhard , Fasshauer Dirk , Milosevic Ira
Published: May 2020

Significance

Exocytosis is of vital importance for life, as it allows cells to communicate with each other and with their environment. This dynamic process is highly regulated with a set of both positive and negative regulators. While promotors of exocytosis are well studied, negative regulators are poorly understood. We discovered that a small SNARE protein amisyn (STXBP6) acts as a vertebrate-specific competitor of synaptobrevin-2, a key player in exocytosis. Amisyn contains an N-terminal pleckstrin homology domain that mediates its transient association with the plasma membrane by binding to phospholipid PI(4,5)P
2
. Both the pleckstrin homology and SNARE domains are needed to inhibit exocytosis. Understanding the mechanisms by which amisyn regulates exocytosis will advance our comprehension of pathological processes in diabetes and autism.
A family of hyperpolarization-activated channels selective for protons
Authors: Wobig Lea , Wolfenstetter Thérèse , Fechner Sylvia , Bönigk Wolfgang , Körschen Heinz G. , Jikeli Jan F. , Trötschel Christian , Feederle Regina , Kaupp U. Benjamin , Seifert Reinhard , Berger Thomas K.
Published: May 2020

Significance

We discovered a subfamily of voltage-gated ion channels, called HCN-like channels, consisting of two members, HCNL1 and HCNL2. In contrast to classic pacemaker HCN channels in the heart and brain, HCNL1 conducts protons rather than potassium or sodium ions. The pore domain, which exists in most voltage-gated channels, is nonconducting. Instead, protons permeate the channel via the voltage-sensing domain involving the S4 motif. Key to proton conduction is a methionine residue that interrupts the regularly spaced series of arginine residues in S4. We show that fish sperm use this unusual ion pathway to create a hyperpolarization-gated proton influx that counterbalances an alkaline-activated K
+
channel.
Improved bacterial recombineering by parallelized protein discovery
Authors: Wannier Timothy M. , Nyerges Akos , Kuchwara Helene M. , Czikkely Márton , Balogh Dávid , Filsinger Gabriel T. , Borders Nathaniel C. , Gregg Christopher J. , Lajoie Marc J. , Rios Xavier , Pál Csaba , Church George M.
Published: May 2020

Significance

Bacterial recombineering allows researchers to interrogate microbes by modifying their genomic DNA. Improvements to the efficiency of recombineering have allowed many simultaneous edits to be made at once. Here we describe "serial enrichment for efficient recombineering" (SEER), a method for identifying efficient single-stranded DNA-annealing proteins (SSAPs) in a microbe of interest. We use SEER to identify two SSAPs: 1) CspRecT doubles editing efficiency over Redβ, the state-of-the-art in
Escherichia coli
recombineering; and 2) PapRecT achieves high efficiency in
Pseudomonas aeruginosa
, a widely studied human pathogen. We show that these SSAPs work effectively across a broad range of Gammaproteobacteria, demonstrate vastly improved performance in multiplex applications, and provide broad host-range plasmid resources.
How differential privacy will affect our understanding of health disparities in the United States
Authors: Santos-Lozada Alexis R. , Howard Jeffrey T. , Verdery Ashton M.
Published: May 2020

The application of a currently proposed differential privacy algorithm to the 2020 United States Census data and additional data products may affect the usefulness of these data, the accuracy of estimates and rates derived from them, and critical knowledge about social phenomena such as health disparities. We test the ramifications of applying differential privacy to released data by studying estimates of US mortality rates for the overall population and three major racial/ethnic groups. We ask how changes in the denominators of these vital rates due to the implementation of differential privacy can lead to biased estimates. We situate where these changes are most likely to matter by disaggregating biases by population size, degree of urbanization, and adjacency to a metropolitan area. Our results suggest that differential privacy will more strongly affect mortality rate estimates for non-Hispanic blacks and Hispanics than estimates for non-Hispanic whites. We also find significant changes in estimated mortality rates for less populous areas, with more pronounced changes when stratified by race/ethnicity. We find larger changes in estimated mortality rates for areas with lower levels of urbanization or adjacency to metropolitan areas, with these changes being greater for non-Hispanic blacks and Hispanics. These findings highlight the consequences of implementing differential privacy, as proposed, for research examining population composition, particularly mortality disparities across racial/ethnic groups and along the urban/rural continuum. Overall, they demonstrate the challenges in using the data products derived from the proposed disclosure avoidance methods, while highlighting critical instances where scientific understandings may be negatively impacted.
Genetic association research in football: A systematic review
Authors: McAuley Alexander B. T. , Hughes David C. , Tsaprouni Loukia G. , Varley Ian , Suraci Bruce , Roos Thomas R. , Herbert Adam J. , Kelly Adam L.
Published: May 2020

Genetic variation is responsible for a large amount of the inter‐individual performance disparities seen in sport. As such, in the last ten years genetic association studies have become more common; with one of the most frequently researched sports being football. However, the progress and methodological rigour of genetic association research in football is yet to be evaluated. Therefore, the aim of this paper was to identify and evaluate all genetic association studies involving football players and outline where and how future research should be directed. Firstly, a systematic search was conducted in the Pubmed and SPORTDiscus databases, which identified 80 eligible studies. Progression analysis revealed that 103 distinct genes have been investigated across multiple disciplines; however, research has predominately focused on the association of the ACTN3 or ACE gene. Furthermore, 55% of the total studies have been published within the last four years; showcasing that genetic association research in football is increasing at a substantial rate. However, there are several methodological inconsistencies which hinder research implications, such as; inadequate description or omission of ethnicity and on‐field positions. Furthermore, there is a limited amount of research on several key areas crucial to footballing performance, in particular; psychological related traits. Moving forward, improved research designs, larger sample sizes, and the utilisation of genome‐wide and polygenic profiling approaches are recommended. Finally, we introduce the Football Gene Project, which aims to address several of these limitations and ultimately facilitate greater individualised athlete development within football.
Tunable magnetic anisotropy in Cr–trihalide Janus monolayers
Authors: Albaridy Rehab , Manchon Aurelien , Schwingenschlögl Udo
Published: May 2020

Achieving a two-dimensional material with tunable magnetic anisotropy is highly desirable, especially if it is complemented with out-of-plane electric polarization, as this could provide a versatile platform for spintronic and multifunctional devices. Using first principles calculations, we demonstrate that the magnetic anisotropy of Cr–trihalides become highly sensitive to mechanical strain upon structural inversion symmetry breaking through the realization of Janus monolayers. This remarkable feature, absent in pristine Cr–trihalide monolayers, enables mechanical control of the direction of the easy axis: biaxial compressive/tensile strain supports in-plane/out-of-plane orientation of the easy axis. The magnetic exchange itself shows higher sensitivity to compressive than to tensile strain, while in general the Janus monolayers maintain ferromagnetic ordering in the studied range of strain.
Data-driven exploration and continuum modeling of dislocation networks
Authors: Sudmanns Markus , Bach Jakob , Weygand Daniel , Schulz Katrin
Published: May 2020

The microstructural origin of strain hardening during plastic deformation in stage II deformation of face-centered cubic (fcc) metals can be attributed to the increase in dislocation density resulting in a formation of dislocation networks. Although this is a well known relation, the complexity of dislocation multiplication processes and details about the formation of dislocation networks have recently been revealed by discrete dislocation dynamics (DDD) simulations. It has been observed that dislocations, after being generated by multiplication mechanisms, show a limited expansion within their slip plane before they get trapped in the network by dislocation reactions. This mechanism involves multiple slip systems and results in a heterogeneous dislocation network, which is not reflected in most dislocation-based continuum models. We approach the continuum modeling of dislocation networks by using data science methods to provide a link between discrete dislocations and the continuum level. For this purpose, we identify relevant correlations that feed into a model for dislocation networks in a dislocation-based continuum theory of plasticity. As a key feature, the model combines the dislocation multiplication with the limitation of the travel distance of dislocations by formation of stable dislocation junctions. The effective mobility of the network is determined by a range of dislocation spacings which reproduces the scattering travel distances of generated dislocation as observed in DDD. The model is applied to a high-symmetry fcc loading case and compared to DDD simulations. The results show a physically meaningful microstructural evolution, where the generation of new dislocations by multiplication mechanisms is counteracted by a formation of a stable dislocation network. In conjunction with DDD, we observe a steady state interplay of the different mechanisms.
Strong nonlinear optics in on-chip coupled lithium niobate microdisk photonic molecules
Authors: Wang Min , Yao Ni , Wu Rongbo , Fang Zhiwei , Lv Shilong , Zhang Jianhao , Lin Jintian , Fang Wei , Cheng Ya
Published: May 2020

High-quality lithium niobate (LN) thin-film microresonators provide an ideal platform for on-chip nonlinear optical applications. The strict phase-matching condition should be satisfied for an efficient nonlinear optical process, which requires dispersion engineering with an LN microresonator. However, this is challenging in single microresonator, resulting from the fabrication error. Here, we demonstrate strong nonlinear effects in a photonic molecule (PM) structure composed of two strongly coupled lithium niobate microdisks. The size mismatch of the microdisks enables phase matching by employing coupling-induced frequency splitting to compensate for the material and geometric dispersion. With a continuous wave excitation, rich nonlinear optical phenomena including cascaded four-wave mixing and stimulated Raman scattering were observed around the second harmonic signal. Meanwhile, an ultra-high four-wave mixing absolute conversion efficiency of 14% as obtained when the second harmonic signal power is at microwatts level. The LN PM is of great potential for applications in nonlinear integrated photonics.
Bound states in the continuum in abruptly terminated dielectric slab waveguides
Authors: Bezus E A , Bykov D A , Doskolovich L L
Published: May 2020

We demonstrate that dielectric slab waveguides terminated with a dielectric ridge (i.e. with a slab waveguide segment having a greater thickness) support high-Q resonances and bound states in the continuum (BICs). The resonances and BICs take place at oblique incidence of TE-polarized guided modes in the total internal reflection geometry, when all the incident radiation is reflected at the end facet of the ridge and is not scattered out of the waveguide. We derive a simple coupled-wave model rigorously proving the BIC existence and predicting its locations. The predictions of the model are in an excellent agreement with the results of the rigorous numerical simulations. We also discuss the influence of the symmetry of the structure on the BIC existence. The obtained results may be useful for the design of novel integrated nanophotonic devices.
Wireless Sensor Network Data Communication and Information system to Regulate Water Volume and Turbine Rotation
Authors: Zefi Suzan , Susanti Eka , Halimahtussa’diyah R.A , Sholihin  , Fakhirah Amirah
Published: May 2020

The increasing need for electrical energy makes innovation in creating alternative energy is needed to help meet the needs of electrical energy that is more efficient and environmentally friendly. Therefore, the selection of water turbines as alternative energy because the cost of building hydropower is relatively low and environmentally friendly, making it a competitive source for renewable energy. Wireless Sensor Network (WSN) is a wireless network consisting of several sensor nodes that are individual that are used to monitor the condition of a place and can interact with its environment by means of sensing, controlling and communication to its physical parameters. The application of WSN to water turbines as a power plant is used to control and remotely monitor water turbines. So that it allows users to get maximum information and is real time without having to be in the sensor area. The programming used for this tool is the Basic Compiler AVR and Virtual Basic to display data in the form of graphs. Then the programming will be analyzed which has been entered at ATMega128 and ATMega8, which is programming to measure the height of the water tank and control the output of the tool.
Implementation of DSK TMS320C6416T Module in Modified Stethoscope for Lung Sound Detection
Authors: Pratama D A , Husni N L , Prihatini E , Muslimin S , Homzah Ozkar F.
Published: May 2020

This paper presents a design of digital stethoscope that is modified using DSK TMS320C6416T. This modified stethoscope is proposed for helping the doctor to make a true decision and the same perception on the symptoms of someone’s disease. Using the conventional stethoscope usually gives drawback, such as the doctors usually makes misinterpretation on the auscultation. The reason is because of the errors that occur due to the difference on the sensitivity of the ear and the experiences of the doctor. This research offers a DSK TMS 320C6416T as an instrumentation system for identification and analysis on the lung sound. The modified design of the digital stethoscope that is proposed in this research gives benefit to the users because it provides the result in the form of the signals that can be monitored in the PC. The results of this designed stethoscope showed the interpretation of graphs in the form of the spectrogram and scalogram which will help the simplification on the analysis of lung sounds as well as to minimize or avoid the limitations of hearing problems in the process of auscultation. The method used in lung sound analysis in this research includes Fourier Transformation that is then developed into a Short-Time Fourier transform (STFT) and continued to the Wavelet Transform. Based on the test data for normal lung sounds, it was found that the working frequency range was 90 to 1265 Hz. The adventitious sounds were found with frequency range from 60 to 1980 Hz. In this research, it was also found that the lung sounds were at the frequency range from 90 to 1015 Hz for direct measurement to patients.
Development and Feasibility Analysis of Floating Solar Panel Application in Palembang, South Sumatra
Authors: Junianto Benny , Dewi Tresna , Sitompul Carlos R
Published: May 2020

PV system utilize the photovoltaic effect to generate electricity directly from the energy brought by the sunrays. However, the normal ground installation of PV panel is prone to several effect reducing the power output and efficiency, such as the overheated panel surface that can lead to malfunction of a cell. The alternative for ground installation is installing the PV panel on the surface of a water body such as river or lake, and called Floating Solar Panel. This paper presents the pilot project for application of floating solar panel in Palembang. This setting is also functioning as passive or natural cooling for the panel and increase the power output. The pilot project was conducted on August 2-8, 2019 by comparing two 100 Wp Poly-crystalline PV panels. The passive cooling of floating solar panel can reduce surface temperature by 2
o
C compared to ground installation. The experiment shows the most effective time to harvest the power from the sun is from 11.00 AM to 02.00 PM. The average output power generated by Floating Solar Panels is 51.6 Watts, compared to 42.9 Watt Ground Solar panels.
Intelligent Evolutionary Controller for Flexible Robotic Arm
Authors: Jamali Annisa , Mat Darus Intan Z.
Published: May 2020

Robotic is one of the key technologies towards Industrial Revolution 4.0. Robotic system, especially robotic arm have received tremendous demand in various fields especially manufacturing industry. Robotic arm is highly needed to enhance production, improve output, reduce human error and the most importantly, earn more profit with fast return on investment. The current industrial robotic arm, not only they are very expensive and required specialist for maintenance, they are also very heavy and difficult to manoeuvre. These facts are the reason why robotic solution are still unaffordable in most small and medium manufacturing industries in developing countries. Despite all the drawbacks, there is still a pressing need to employ robotics solution with the inherent problems of worker-related issues and output quality. Today, work requires a nimble and versatile robot and yet remain reliable. Operating robots should be simpler, where the learning curve is less steep. The user interface should be friendly and intuitive. Recently, there is a growing interest in employing lightweight, stronger and more flexible robotic arm in various fields. However, lightweight robot arm can be more easily influenced by unwanted vibrations, which may lead to problems including fatigue, instability and performance reduction. These problems may eventually cause damage to the highly stressed structures. This research focused on the development of the intelligent evolutionary controller algorithms for controlling flexible robotic arm manipulator. The controller algorithm has been formulated for trajectory planning control and vibration cancelation utilizing intelligent evolutionary algorithms such as Particle Swarm Algorithm and Artificial Bees Colony. The developed evolutionary algorithms have been implemented and experimentally verified using robotic arm manipulator experimental rig. The performances of these intelligent evolutionary controllers were found to be far better than the conventional method in term of input tracking, trajectory control and vibration cancelation.
Scoopy Blade for Low Current River Waterwheel Supporting the Energy Needs in the Rural Areas of Indonesia
Authors: Darmawi  , Sipahutar Riman , Bizzy Irwin
Published: May 2020

A series of experiment has been carried out to measure the effectiveness of the new rotor blades of waterwheel in order to absorb as much as possible the energy of flow water. The scoopy blade is predicted convert more effectively and efficiently the water energy into useful mechanical energy compared to flat blade. This blade is intended to used for undershot waterwheels operated in low current rivers in Indonesia. The scoop blades are tested at a flow range from 0.8 m / sec - 2.5 m / sec in the range of gamma angle 100, 150 and 200. All results are compared to the flat blade where gamma angle is zero. The test results show the scoopy blade with gamma angle 100 is effectively harnessed the water energy compared to others. The blades with gamma angle 100 produce bigger power and bigger efficiency than blades of other gamma angles.
Design Control Systems of Marking Machine and Total Length Check Damper Assembly Based on Programmable Logic Controller
Authors: Ardi Syahril , Ardianto Juliantito
Published: May 2020

This research was conducted at an automotive manufacturing company in Indonesia that produces shock absorber (damper). Case study was conducted on the front shock absorber of the motorcycle (front fork). This new product will be given special marking at the designated place. Previous Front Fork products did not have a marking process at the Front Fork Assembly Line. We designed the marking machine control system. This machine control system uses the main MC2000N machine actuator and MC2000T Controller². The machine design is then added to the total length check function. The results obtained are the traceability of the damper made easier and faster in handling claims from the customer. The damper becomes in accordance with the standard.
Study on using Casting Simulation Software for Design and Analysis of Riser Shapes in a Solidifying Casting Component
Authors: Malik Irawan , Anwar Sani Almadora , Medi Ali
Published: May 2020

Filling and solidification of molten metals are very complex and difficult to simulate correctly by conservative methods. For a large industrial application, it needs an alternate approach that is fast, reliable and user-friendly. In current casting industries, product development paradigm is shifting from traditional trial-and-error in the workshop to computer-aided casting design and simulation package by a computer(s). Computer-aided casting simulation plays an important role in the paradigm of new product development by way of modeling entire casting processes and reveals a dynamic behavior of casting scheme in working conditions. This study, highlighting is given on using casting simulation software which helps foundry industries to design and analysis the size and shape of the riser. Intended for simulation simplification in this study, grain size of mold green sand, casting material quality, casting process parameters are deliberated identical for all design schemes. Only the shape and dimensional variances of sprue/risers are taken into considerations for defects analysis. It is found that defects such as micro and shrinkage porosities, and improper solidification, are directly related to gating and risers system. Casting simulation software is used for mold filling and solidification analysis and it is observed that the proposed gating and risers system design will improve casting results with small defects. From this study, the conclusion can be stated that taper sprue design, also acts as a riser, with an additional four small risers that will produce a small fraction of porosity inside of the casting part. Validation of simulation, in the future, will be proved through experimental trials in the foundry shop.
Effect of Catalysts on the Quality of Biodiesel from Waste Cooking Oil by Induction Heating
Authors: Rusdianasari  , Syarif Aida , Yerizam Muhammad , Syahirman Yusi M. , Kalsum Leila , Bow Yohandri
Published: May 2020

The target of increasing the use of renewable fuels is directly proportional to the increasing demand for biodiesel. High demand for biodiesel must be balanced with sufficient availability from producers. One of the factors that influence biodiesel conversion rate is the use of catalysts. The use of sodium teoxide (CH3ONa) catalyst in the manufacture of biodiesel can be applied in the process of biodiesel production using induction heating technology. This technology will accelerate the heating process needed in the transesterification reaction. Based on research that has been done, the use of a catalyst concentration of 1% will produce a yield of 86.95% with product quality in accordance with SNI such as density 0.858 gr/cm3, viscosity 5.727 cSt, flash point 190°C, and acid number 0.439 mg-KOH/gr.
Evaluation of Main Parameter Process of Anaerobic Digestion of Cow Dung in Fixed Dome Biodigester on Methane Gas Quality
Authors: Kalsum Leila , Hasan Abu , Rusdianasari  , Husaini A. , Bow Yohandri
Published: May 2020

Methane gas produced from anaerobic digestion has been widely studied through some of the researches, but the quality of methane gas produced is still a problem because the concentration of methane gas produced is generally low. Biogas formation is a complex process involving several process parameters that must be controlled such as temperature, pH, and fermentation time. Therefore the use of biogas is still problems and it has not been widely used. This study aimed to evaluate the main parameter process of anaerobic digestion of cow dung in fixed dome biodigester on methane gas quality. The research was carried out for 30 days and every 5 days the quality of methane gas (CH4), organic content (COD) and total solids (TSS) were analyzed. From the results of the study, it was found that temperature, pH, and fermentation time greatly effect on biogas produced. at high methane gas concentrations (59,12%) occur at pH 7.1, temperatures 350 C and fermentation time of 25 days. Besides that the longer the fermentation time, the COD and TSS content decreases and the concentration of methane gas increases.
The Utilization of Plastics Waste in Flexible Pavement Hot Rolled Sheet and Asphalt Concrete Wearing Course with Marshall Immersion and Cantabro Test
Authors: Adhitya B B , Pataras M , Kadarsa E , Nurainiyah F
Published: May 2020

Road was a transportation infrastructure that connect a place to the other place. Road pavement should be utilize resources efficiently, effectively and eco friendly. One important material that used for road pavement is asphalt. Plastics are very useful in daily life but the existence of plastic these day became problems to the environment especially the plastic waste. Plastic waste has negative impact for out environment because it was hard to decompose. This research was done to know the utilization of hot rolled sheet wearing course (HRS-WC) and asphalt concrete wearing course (AC-WC) mixture by using waste of plastic such as cups, plastic bags, and plastic snacks with Marshall immersion test and cantabro test. The result that can be concluded are optimum aspal content with each kind of plastics. Then Marshall Immersion test with the index of retained strength (IRS) value and cantabro test value.
The Effect of Polycarboxylate Addition Towards The Workability and High Strength Concrete
Authors: Sumiati  , Mahmuda  , Herius Andi , Subrianto Agus
Published: May 2020

High strength concrete will be get when using very low Water/cement ratio (W/C). The low Water/cement ratio (W/C) usually has a difficult workability. Beside, if the concrete is getting harder, it will occurred shrinkage and cracking. Fresh concrete workability can be fixed, by adding superplasticizer/polycarboxylate into the fresh concrete, controlling slump value and using graded aggregate as proper to the specification.

This study aims to get the optimal percentage of polycarboxylate that can be used to concrete with the compressive strength of 50 MPa with a good workability. The test conducted on 60 concrete samples with the diameters of 15 cm and height of 30 cm. Polycarboxylate which was added had variants of 0%; 0,5%; 1,0%; 1,5 and 2,0% to the cement weight. Before the compressive strength test, the sample was hardened and did the test after 7; 14; 21 and 28 days. According to the test result, optimal Polycarboxylate added is in the amount of 1%-1,5% to the cement weight, which means it will get the concrete with the compressive strength of 50 MPa, has good and economical workability.
The Utilization of Crushed Clay Brick as Coarse Aggregate on Eco-Green Lightweight Foamed Concrete
Authors: Sumiati  , Mahmuda  , Sukarman  , Indra Siswa , prabudi Darma
Published: May 2020

Lightweight Concrete has advantages in its weight, so as to minimize bending moment and mitigate earthquakes. Lightweight Concrete can be made by changing its aggregate with a lightweight aggregate or foaming the mortar, so that the concrete becomes porous and lightweight. But, porosity, density and compression strength concrete have relation. This research aims to obtain the value of density, porosity and compression strength from Lightweight foamed concrete that use crushed clay bricks as coarse aggregate.

Testing was conducted to 96 samples of concrete with diameter of 15 cm and height of 30 cm. Foam Agent added is varied 0%-3.5% to the water weight. Before compressive strength testing, the samples were first cured and tested after age 7; 14; 21 and 28 days.

From the testing result, it is obtained that crushed clay bricks can be made as coarse aggregate in eco-green lightweight concrete. If foam agent added are 2-3.5% then it is categorized as Moderate Strength Concrete, while if foam agent added is < 2% it is categorized as Structural Concrete, based on specification of Indonesian National Standard (SNI 03-3449-2002)
Plastic To Fuel Technology As Alternative Operation Of Gas Engine Sukawinatan Waste To Energy In Palembang
Authors: Fithri N , Fitriani E
Published: May 2020

Construction of power plant (PLTSa) which can produce energy up to 500 kWH. Sukawinatan landfill which is predicted to produce CH4 around 12 nmh3/hour in each well, with the calculation of 50 wells can produce 600 nmh3/hour. However, for the current status, it turns out that CH4 at TPA wells which able to generate up to 500 kW in volume decrease so that it can only operate with a load of 45-94 kW, therefore in 2018 PLTSa Optimization review has been carried out Sukawinatan which is a study of composition calculation waste and gas potential as a basis for consideration for the development of TPA wells including the technical design. The optimization of PLTSa Sukawinatan has not been implemented because the generating capacity has not yet received the best value due to technology that did not meet the requirements. In this study, researchers used a Descriptive Action Research methodology focused on implementing actions aimed at improving quality and providing solutions problems in the area under study. The Ministry of Energy and Mineral Resources offers an alternative use of PLTSa Sukawinatan with the addition of the Plastic to Fuel scheme as a solution for generating fuel. It is expected this research can contribute to the Government of the City of Palembang and the Palembang community as a result of the application of waste management as a source of sustainable electrical energy source of lighting for Palembang.
Geochemical Studies of Claystone Based on Analysis of Scanning Electron Microscope (SEM), Talangsawah, Merapi District and Surroundings of Lahat Regency, South Sumatra
Authors: Falisa  , Chandra Hendri , Harnani
Published: May 2020

Claystone formation is related to its geological condition, which is where the claystone is formed. The claystone environment is very influential on the composition that supports the formation of the claystone. The fine-sized claystone in the petrography is very difficult to determine its composition so by using the Scanning Electron Microscope (SEM-EDX) analysis it will be known the claystone environment. The purpose of this study was to determine the claystone environment based on its chemical composition. The SEM-EDX analysis showed that five samples were analyzed, claystone samples ( F-1, F-2, F-3 and F-4) consisting of calcite, halite, and siderite minerals characterizing marine environment deposits, and claystone samples ( F-5) consists of siderite, kaolinite, and pyrite minerals characterizing subaerial environmental deposits in the abandoned channel.
Biodiesel Production from Bintaro (Cerbera Manghas L) Seeds with Potassium Hydroxide as Catalyst
Authors: Zikri A. , Erlinawati  , Sutini PL , Agus M , Fathona S.
Published: May 2020

Biodiesel is methyl or ethyl esters which is an alternative fuel for diesel engines that is produced by chemical reaction of vegetable oil or animal fat with alcohol such as methanol. The reaction requires a catalyst that is usually a strong base, such as potassium hydroxide. The purpose of this research was to produced biodiesel from Bintaro seed with potassium hydroxide as catalyst that have quality based on Standard Biodiesel Quality (SNI 7182:2015). Degumming process is required to remove the gum and the other impurities of vegetable oil which is the raw material for biodiesel production by using weak acids, such as phosphoric acid and citric acid was studied in this research. The experiment used catalyst with concentration 0.6-1.2 % (v/v) of raw material and the result shows the highest yield of biodiesel at 0.6 %(v/v) was 87.6 %. The characterization of methyl ester from bintaro seeds has the value that fulfilled the recommendation of biodiesel standards.
Effects of Carburizing Processes on Nodular Cast Iron with Variations in Temperature, Time and Cooling System
Authors: Effendi Sairul , Firdaus  , Karmin  , Romli  , Homzah Ozkar F. , Eka Fernandes Yogi
Published: May 2020

Nodular Cast Iron have ductile properties when added with elements of magnesium or cerium and this will cause the ductility range of 10-20% increase, hardness and low tensile strength, easy to be formed compared to alloy steel (alloy steel) or high carbon steel (high carbon steel) and the price is relatively cheap, making this material widely used as a basic material (raw material) for the manufacture of a product. To get hard properties on the surface, this material can be carried out a surface hardness process, so that the product can be functioned according to its application. Way that can be done to increase surface hardness as well as low carbon steel strength is by adding carbon elements to the steel which is commonly known as carburizing. The carburizing process is carried out on a muffle furnace specifically heat treatment that is easy to operate in setting the heating temperature, heating speed and holding time. In this research, it is designed and carried out on low carbon steel using carburization media with a ratio of 70% activated carbon and 30%, calcium carbonate (CaCO3) at 900°C heating temperature, holding time variations of 2, 3 and 4 hours respectively, then proceed with the process cooling or double quenching. The results of this study are expected to obtain a product made with cast iron nodular material, so it can the economic value of the product.
Smart Cup Holder For Visually Impaired People
Authors: Aryanti Aryanti , Lin Wei-Cong , Lin Chih-Yi , Brian Henriquez Billy , Mekongga Ikhthison , Raymond See Aaron
Published: May 2020

Pouring hot drinks is more challenging for the visually impaired and is challenging to determine the exact level of the water inside. This paper presents the design and development of an assistive device to assist the visually impaired handle hot liquids safer. In the proposed system, a cup holder developed that measures the water level and temperature through the use of various sensors. A cup prototype was designed using CAD and printed for further testing. The team has successfully developed a working prototype that determines water level through pressure and provides a warning to the user when the water is too hot. In the future, further tests will be done to allow various types of cups on the cupholder.
Analysis of Server Virtualization Service Performance Using Citrix Xenserver
Authors: Surahmat  , Tenggono Alfred
Published: May 2020

Virtualization technology is a technology that allows making things into a virtual form. Server virtualization itself is a software technology that can enable physical servers to run many operating systems on a physical server. In this study, the service performance testing of Citrix Xenserver was conducted to determine the service performance of this server virtualization. The research method in this study used action research by testing the CPU load and Memory Usage, Benchmark, Network Traffic, and then the response of users by using the technology acceptance model approach. The results obtained from this study were that Citrix XenServer is able to run a virtual operating system well and also get a good user response which can be seen from the questionnaire data.
Predicting Cost Recovery Rate of Ischemic Stroke Patients: A Potential Application of Big Data Analysis in Hospital
Authors: Fahlevi Heru , Roli Ilhamsyah Putra Teuku , Suryani Oktari Rina
Published: May 2020

Cost controlling strategy have become a vital issue in the hospital sector, particularly after the application of a prospective payment system in many countries. This study aims to examine the determinants of the hospital patient actual cost, differences, and Cost Recovery Rate (CRR) in a referral Indonesia hospital. Besides, it also explores the potential use of the analysis result for cost management in the hospital. The population of this study was 2018 Ischemic Stroke inpatient cases (677 observations). The data was obtained from the hospital medical record department and insurance claim department. The multiple regression method is used to analyze the actual patient costs and reimbursement fees data, which is followed by semi-structured interviews with principal officers of the hospital. The interviews were conducted to assess and evaluate the potential and challenges of the big data analysis application. The result of this study indicates that the patient cost, differences, and CRR are determined by severity level and length of stay (LOS), while patient gender and age have no significant influence on the tested dependent variables. The interviews also reveal that the hospital has not used the big patient data in managing cost optimally. Based on the result of this study, the hospital can used the tested statistical model to control patient cost, evaluate the treatment and improve cost-effectiveness of patient treatment.
User Experience Analysis on Class I LPKA Palembang Filial E-School
Authors: Tri Octafian D. , Febrianty  , Hadiwijaya Hendra
Published: May 2020

The Class I LPKA Palembang management wishes to present academic services through the provision of systems that can better support education. Therefore, Filial e-school was built and implemented as a learning system in filial schools implemented in LPKA. The e-school system with the link address http://e-schoolfiliallpka.com/, consists of several modules: a.Video-based learning module, b.Audio-based learning module, c.Text-based learning module, d.Distance learning media, e.Giving and submission assignment media, f.Discussion media. This system facilitates the learning process of LPKA students to be able to learn independently with existing media and make it easier for teachers to deliver learning material. The system development method used in this study was the Rapid Application Development (RAD) method. Testing of user experience on the use of e-school was tested using the User Experience method with the following aspects:Perspicuity, Efficiency, Dependability, Stimulation, and Novelty. Based on the results of UEQ differences between parent schools’ teachers and LPKA students on the use of filial e-school, it was found that e-school filial gave slightly higher impressions to parent schools’ teachers compared to students. The average results of the UEQ questionnaire for all users of the e-school filial system showed that the stimulation and novelty aspects were felt to be higher than the other four aspects.
Geographic Information Systems Search Test Location For Admission Of New Students In Sriwijaya State Polytechnic Using Location Based Service (LBS) Method
Authors: Ariyanti Indri , Yusniarti  , Wahyuni Sri
Published: May 2020

New Student Admission Selection or in Indonesia called New Student Admission Selection (SPMB) is one of the new student admission selection tests for universities. The problem is usually found during the admission of new students because the students have come from outside the city. Another problem that could be a supervisor might make a mistake when they found the room they were late. And also the Admin is difficult to coordinate with supervisors and new students during the test. This is a geographic information system to search the test locations. This system is built using the Location Based Service (LBS) method by utilizing GPS in Maps. The system development method that is used is RUP, this system will provide the direction of the user’s mobile device access. The results of research are made in a system that can facilitate students in finding the location of exam rooms. The geographical information system in mapping is the test location for the students who are going to do the test for the test location, and make it easier for supervisors to find out the location of the new student admission selection test.
Design of Smart System to Control Energy in Idle Time
Authors: Roslina  , Amelia A , Hartama D , Fahmi N
Published: May 2020

This study aims to control energy consumption at idle time or outside working hours in office buildings both government and private so that there is not waste in the use of energy. To control the use of energy, an energy smart control system is developed by applying Wireless Sensor Network (WSN) and Internet of Thing (IoT) technology in order to realize energy efficient to support Smart Campus in Industrial Era 4.0. The Prototype of smart system to control energy testing was conducted at the Politeknik Negeri Medan building. The process of controlling energy consumption at idle time can be done. By controlling energy consumption at idle time office activities have an effect on saving energy.
Smart Control of Temperature and Humidity for Opak Dryer Oven
Authors: Amelia A , Roslina  , Fahmi N , Zarlis M , Sundawa B V
Published: May 2020

Cloudy or rainy weather will minimize the sun’s radiation to the ground. It will affect to production level of Opak by Micro, Small and Medium Enterprises (MSMEs). They do conventional drying processes using sunlight and it needs a large drying area. The drying process using an electric oven equipped with an automatic temperature detection and control system, it called the Smart COpak, is an effective and efficient method. This system will detect and control the temperature of the electric oven in accordance with the temperature of the sun so that the printed Opak container does not melt or melt. This research will contribute to the development of science and technology in the field of Telecommunications Electronics and Information Technology. Furthermore, it can help effectively for Opak producer to increase Opak production without being affected by weather conditions or the drying area. Opak production can already be done both indoors and outdoors. Finally, consumer demand can be fulfilled.
Whirlwind Classification with Imbalanced Upper Air Data Handling using SMOTE Algorithm and SVM Classifier
Authors: Novitasari D C R , Foeady A Z , Nariswari R , Asyhar A H , Ulinnuha N , Farida Y , Santi D R , Ilham  , Setiawan F
Published: May 2020

Whirlwind is a natural disaster that often occurs and is difficult to predict from some time before. Early identification is needed to prevent a lot of casualties and losses. Whirlwind caused by instability in the atmosphere. Instability in the atmosphere usually occurs at the beginning of the day and the whirlwind can be identified based on the upper air parameter which can represent atmospheric instability. The purpose of this research is to optimize SVM classification with SMOTE algorithm to handling problems in imbalanced data and this research can minimize casualties and losses or also be a breakthrough for disaster-prone areas to be given early warning. The process for identifying whirlwind has several stages, namely pre-processing, imbalanced data handling, and classification. Pre-processing is normalized data. Whirlwind data has a classification problem, namely inter-class data that is not balanced so it needs to be corrected using the SMOTE Algorithm. Research on the identification of whirlwind using a combination of SMOTE-SVM produces the best accuracy is 98.8 %. When compared to data without the SMOTE algorithm the results obtained are better if the SMOTE method is applied. The specificity value is also better when given the SMOTE method. Based on these results it can be concluded that SMOTE can overcome the problem of imbalanced data in the upper air data by increasing the value of the classification of the whirlwind.
Oil Palm Sorting System of Fresh Fruit Bunch (FFB) Using Forward Chaining Algorithm
Authors: Wahyuni S N , Affan R
Published: May 2020

Oil palm is the producer of oil and fuel. To get a good quality, it is necessary to sort the fresh oil palm fruit based on the characteristics and criteria of the type of fresh fruit bunches (FFB). This paper aims to carry out the process of sorting the oil palm fruits using the Forward Chaining algorithm to obtain superior quality oil palm fruit based on the characteristics and criteria of fresh oil palm fruit bunches. The sorting phase purpose is to shorten industrial process phase and reduce cost. This sorting mechanism will be developed as a system that can educate oil palm farmers to do sorting before the oil palm goes through the industrial process. The research method uses a forward chaining algorithm by determining 5 criteria and 39 characteristics of fresh oil palm fruit bunches with percentage value determined by using the classical probability calculation. The accuracy of this research is 100%.