bluuebunny/crossref_metadata_2025 huggingface dataset:
Photometric investigations on two totally eclipsing contact binaries: V342 UMa and V509 Cam
Authors: Li Kai , Xia Qi-Qi , Liu Jin-Zhong , Zhang Yu , Gao Xing , Hu Shao-Ming , Guo Di-Fu , Chen Xu , Liu Yuan
Published: October 2019

By analyzing two sets of complete BVRcIc
light curves for V342 UMa and three sets of complete BVRcIc
light curves for V509 Cam, we determined that the two systems are both W-subtype contact binaries and that V342 UMa manifests a shallow contact configuration, while V509 Cam exhibits a medium contact configuration. Given that both of them are totally eclipsing binaries, the physical parameters derived only by the photometric light curves are reliable. Meanwhile, the period changes of the two targets were analyzed based on all available eclipsing times. We discovered that V342 UMa shows long-term period decrease with a rate of −1.02(± 0.54) × 10−7 d yr−1 and that V509 Cam displays long-term period increase with a rate of 3.96(± 0.90) × 10−8 d yr−1. Both the conservative mass transfer and angular momentum loss via magnetic stellar winds can be used to interpret the long-term period decrease of V342 UMa. The long-term period increase of V509 Cam can be explained by mass transfer from the less massive star to the more massive one. The absolute parameters of the two binaries were estimated according to their Gaia distances and our derived photometric solution results. This method can be extended to other contact binaries without radial velocities but with reliable photometric solutions. Their evolutionary states were investigated and we found that they reveal properties that are identical to other W-subtype contact systems.
Infrared photometric properties of inner and outer parts of HII regions
Authors: Topchieva Anastasiia , Akimkin Vitaly , Smirnov-Pinchukov Grigorii
Published: October 2019

The fact that infrared ring nebulae (IRRNe) are frequently associated with HII regions provides us with an opportunity to study dust at the interface between ionized and neutral gas. In this paper, we analyze the associated infrared (IR) radiation in the range from 8 to 500 μm in the outer and inner parts of 32 IRRNe showing a round shape. We aim to determine the morphology of these objects and possible dust evolution processes based on comparing IR radiation towards the ionized and neutral regions. We calculate six slopes between adjacent wavelengths in their spectral energy distributions to trace the difference in physical conditions inside and outside the ionized regions. Using data on these 32 objects, we demonstrate that their morphology is likely 3D spherical rather than 2D plane-like. The slope between 70 and 160 μm is the most appropriate tracer of dust temperature in the outer envelope. The larger 8-to-24 μm intensity ratio is associated with smaller intensities at mid-IR, indicating that {polycyclic aromatic hydrocarbons (PAHs) may indeed be generated due to larger grain destruction. These data are important for the subsequent theoretical modeling, and determining the dust evolution in HII regions and their envelopes.
The abundance of massive compact galaxies at 1.0 < z < 3.0 in 3D-HST/CANDELS
Authors: Lu Shi-Ying , Gu Yi-Zhou , Fang Guan-Wen , Yuan Qi-Rong
Published: October 2019

Based on a large sample of massive (M
* ⩾ 1010
M
⊙) compact galaxies at 1.0 < z < 3.0 in five 3D-HST/CANDELS fields, we quantify the fractional abundance and comoving number density of massive compact galaxies as a function of redshift. The samples of compact quiescent galaxies (cQGs) and compact star-forming galaxies (cSFGs) are constructed by various selection criteria of compact galaxies in the literature, and the effect of compactness definition on abundance estimate has proven to be remarkable, particularly for the cQGs and cSFGs at high redshifts. Regardless of the compactness criteria adopted, their overall redshift evolutions of fractional abundance and number density are found to be rather similar. Large samples of the cQGs exhibit a sustained increase in number density from z ∼ 3 to 2 and a plateau at 1 < z < 2. For massive cSFGs, a plateau in the number density at 2 < z < 3 can be found, as well as a continuous drop from z ∼ 2 to 1. The evolutionary trends of the cQG and cSFG abundances support the scenario that the cSFGs at z ≳ 2 may have been rapidly quenched into quiescent phase via violent dissipational processes, such as major merger and disk instabilities. The rarity of the cSFGs at lower redshifts (z < 1) can be interpreted by the decrease of gas reservoirs in dark matter halos and the consequent low efficiency of gas-rich dissipation.
GABE: Galaxy Assembly with Binary Evolution
Authors: Jiang Zhen , Wang Jie , Gao Liang , Zhang Feng-Hui , Guo Qi , Wang Lan , Pan Jun
Published: October 2019

We developed a new semi-analytic galaxy formation model: Galaxy Assembly with Binary Evolution (GABE). For the first time, we introduce binary evolution into semi-analytic models of galaxy formation by using the Yunnan-II stellar population synthesis model, which includes various binary interactions. When implementing our galaxy formation model onto the merger trees extracted from the Millennium simulation, it can reproduce a large body of observational results. We find that in the local universe, the model including binary evolution reduces the luminosity at optical and infrared wavelengths slightly, but it increases the luminosity at ultraviolet wavelengths significantly, especially in F
UV band. The resulting luminosity function does not change very much over SDSS optical bands and infrared band, but the predicted colors are bluer, especially when the F
UV band is under consideration. The new model allows us to explore the physics of various high energy events related to the remnants of binary stars, such as type Ia supernovae, short gamma-ray bursts and gravitational wave events, and their relation with host galaxies in a cosmological context.
Effect of Ginsenosides on Prevention of Alzheimer’s Disease
Authors: Zheng Yi , Gao Xiujun , Chen Qiqi , Yan Peisheng , Liu Rundong , Liang Hao , Zhang Mingchen
Published: October 2019

Alzheimer’s disease (AD), as a neurodegenerative disease that conceals the progressive development of early disease, has a long onset time and complicated etiology. As the number of Alzheimer’s patients increases year by year, it is a hot issue that looking for effective drug prevention and treatment. As the king of Chinese herbal medicine, ginseng contains a variety of pharmacologically active substances, especially ginsenosides can affect multiple metabolic pathways in the body, and its efficacy is relatively complicated. This article reviews the pathogenesis of AD and the preventive effects of five ginsenosides such as Rg1, Rb1, Rg2, Rg5 and Rh1 on AD, in order to provide a basis for the development of functional foods for preventing AD.
Demand side EMS using artificial neural network-based LP method
Authors: Loganathan N , Mayurappriyan P S , Lakshmi K
Published: October 2019

This proposed system introduces advancement technique towards the interest sideways Energy Managing Structure (EMS) of a given concerning hourly power costs. This proposed system studies a bunch of interrelated cost receptive requests popular an educational institution. This requests canister stand provided concluded the fundamental framework as well as stochastic different power sources (for example, wind power plant & sun-based energy sources. What’s more, the gathering of requests possesses a vitality storeroom. The proposed energy managing structure has a limit that every shopper can utilize their individual procedure to direct the current demand and costs trendy the energy dissemination framework. Towards tackle this energy managing structure issue then advancement calculation dependent on Linear Programming (LP) method takes remained executed. Notwithstanding LP calculation an ANN remained connected towards foresee the upcoming energy utilization the bunch of cost receptive requests. Main objective of the planned strategy remains toward boost the usage group of requests after it remains exposed towards an arrangement the compels. In this linear programming calculation enables bunch the interest to purchase, store and pitch vitality at reasonable occasions to change the hourly demand equal. Towards assess execution of this projected calculation of IEEE 14 transport framework remained measured. This outcome demonstrates the bunch of requests to vitality administration framework utilizing the proposed methodology expanding the effectiveness and limiting the misfortunes than the current strategies.
Dual Mode Operation of 8/6 SRM with Optimum Angle Operation in Hybrid Electric Vehicles using FLC based Controller
Authors: Radhakrishnan G
Published: October 2019

An optimum operating period of an 8/6 Switched Reluctance Motor (SRM) based on different load condition is analysed in this paper. The system is designed to analyse the speed control of machine in motoring mode and voltage control mode is carried out in this paper. Dual Mode switched reluctance motor is tested with the fuzzy logic controller, Mamdani method is used in fuzzy based system. In this paper the main objective is to concentrate on modelling the machine to maximise the average torque with minimum torque ripple in the optimised operating region with different loading conditions in dual mode region. This method also found to have increased efficiency, with the closed loop controlling action the system is robust and simple in construction. The optimised designed system has less manufacturing cost due to simple construction. The simulation is carried out using MATLAB/Simulink.
Review and comparative analysis on dc-dc converters used in electric vehicle applications
Authors: Jagadeesh Ingilala , Indragandhi V.
Published: October 2019

This paper is reported with different kinds of DC-DC converters such as sepic, boost and bidirectional converters. Integrating the boost, sepic, bidirectional DC-DC converters enables to identify the suitable converter for renewable energy applications with accurate power rating. The performance of non-isolated converter is assessed on the basis of these review. The solar PV conversion efficiency is low, so the converter is used to step-up/step down the voltage levels. This paper attempts to perform by examing efficiency of DC-DC converters and the voltage and current stress on the switches. A detailed review is carried out on basic PV and fuel cell based electric vehicles.
Current control techniques of single phase shunt active power filter- a review
Authors: Kanagavel Rameshkumar , Indragandhi V
Published: October 2019

This manuscript gives a complete survey on current control for single phase Shunt Active Power Filter (SAPF). Various current control techniques like linear current control, Hysteresis, Model Predictive Current Control (MPCC) and other techniques are discussed. The primary advantages and disadvantages of current controllers in SAPF have been presented in a table. This manuscript offers a suitable reference for forthcoming work in power quality applications and its associated research.
Disturbance Analysis and Implementation of High Voltage Gain Non-Isolated DC-DC Converter for Renewable Applications
Authors: Arunkumari T , Indragandhi V , Sidhu Vikramjeet Singh , Udayanga Hemapala K T M
Published: October 2019

A modified high gain single switch high-voltage converter is presented in this paper. The proposed converter is a blend of a voltage tripler and a SEPIC-boost mode converter. Its operational modes are presented in detail. This converter has advantages that include a single switch, reduced component stress and size, and reduced ripple output voltage and input ripple current. The simulation results of the suggested converter and a conventional multilevel SEPIC converter are presented. The prototype of a 30 V to 400 V input, 400 W output is developed and the performance of the designed topology is evaluated. The theoretical and experimental results conclude that this converter is suitable for high-voltage applications.
Solar powered air conditioner using BLDC motor
Authors: Nazar Ali A , Sivamani D , Jaiganesh R , Pradeep M
Published: October 2019

This paper present a load compressor fed Brushless DC motor for solar power air conditioner under variable air conditions. At current scenario, air conditioners are manufactured according to room size and space with available of objects present in the room.The output of the air conditioner cannot be alternatively changed. This problem is overcome by modify the fixed output of the air conditioner using BLDC motor. The BLDC motor performance is superior when compared to other motor. Solar power is used as the main source which is a renewable energy and readily available and also very useful for the future generation. This work deals with the output of the air conditioner can be alternatively changed according to the size of the room by varying the speed of Brushless DC motor.
An IoT Based Home Automation System
Authors: Paul Sridip , Indragandhi V , Kumar N K , Raja Singh R , Subramaniyaswamy V
Published: October 2019

Industry experts, corporate heads, and chiefs of businesses all agree that we are on the verge of what is to be the Fourth Industrial Revolution – which will be more disrupting and impactful than any we’ve seen in the history of mankind. Automation is without a doubt, one of the pillars of this Industrial Revolution. Consumers worldwide prefer automated systems over manual ones. Today the Internet has become a part and parcel of daily life. We cannot imagine a life without the internet. In this paper we present to you an Automation System which is a real-world application of a fast- growing emerging Internet Technology, The Internet of Things (IoT). A Home Automation System, based on the IOT, makes the consumers life easier, more comfortable, faster and more secure. This cutting-edge technology allows the consumer to have complete control over his or her home appliances and devices from anywhere in the world, via a web browser with an internet connection. The simulation designed by us, in this paper, is a small approximation of a much larger real-world system, the concepts, approach and methodology however, remaining the same.
A Review on Dynamic Voltage Restorer in power systems concerned to the issues of Power Quality
Authors: Pavan Babu Bandla , Indragandhi V
Published: October 2019

Power Quality issues are the important concepts for all types of electricity usage consumers due to increase in power demand at different levels. For achieving power demanded, the power grid is incorporated with single or integrated renewable energy sources which resembles in rise of additional power quality issues than in regular isolated system. In this, a detailed review on different nature of power quality issues, monitoring devices of power quality & power quality mitigation especially by the dynamic voltage restorer-DVR has been explained. A review on DVR for power quality issues like voltage swell, sag, flickers, imbalance, reactive power imbalance and harmonics with distinct power circuit structure and the detailed control strategies for mitigating the mentioned issues is presented in this paper.
Evaluation of brazed monolayer CBN grinding wheel on high-speed steel (HSS)
Authors: Pal Bhaskar , Muralidhar  , Adhikary Nepal
Published: October 2019

Shaping and forming of high-speed steel (HSS) tool with complicated geometry has been a challenge for the cutting tool industry. HSS grades generally display high hardness at high temperature and high wear resistance due to its constituent elements like a high amount of tungsten with the addition of chromium, vanadium and cobalt. HSS being used extensively in the manufacturing industry for machining difficult-cut-materials due to its high hardness and abrasion resistance. CBN grinding wheel is being used extensively for shaping the HSS. In this work, cBN brazed wheel with monolayer configuration is being used to grind HSS. Usually, reasonably uniform grit distribution, adequate spacing between the grits, 50-70% grit protrusion over the brazed surface and strong chemical bond strength are key features of brazed CBN wheel to perform satisfactorily. In the current investigation, the brazed CBN wheel showed limitations of its capability while grinding HSS in dry condition. The high chip load due to adverse grinding combinations, high attrition wear of grit due to its interaction with constituent elements like tungsten, chromium, vanadium and cobalt, fracturing and pull out of the grits are the limitation of the brazed wheel. The paper also concluded with facts to overcome limitations of brazed CBN wheel.
Mining and analyzing process similarity of product module for DPIPP based on PLM database
Authors: Peng W P , Zhang T , Zhang Q H , Ni S W
Published: October 2019

A distributed parametrized intelligent product platform (DPIPP) on basis of product lifecycle management database has been proposed to reveal the interrelationships between product attributes (i.e., structure, function or process) in recent years. Product modules in DPIPP are classified according to composition and structure of products. Components belonging to different product modules may have an identical or similar process route and could be manufacture with the same type of equipment. Mining and analysing the process similarity of product modules can effectively reduce production cost and improve production efficiency. In this paper, a novel product data mining approach with an improved Euclidean distance formula is proposed to research the product module process similarity, which aims to illustrate the effect of the structural change on the product process, then provide theoretical support for improving production patterns and reducing production costs to adapt to mass customization. The feasibility and effectiveness of the method are verified via the analysing of the process similarities among three different types of valves.
Research of the Green Product Design and Evaluation Methods based on Concurrent Engineering
Authors: Xiaona Li , Xin Liu
Published: October 2019

Based on the concept of concurrent engineering and green design, the framework of green concurrent engineering structure was discussed. Then the key technologies and key factors were analyzed, and the evaluation indicators and design methods of green design are studied. So product development could be controlled from the whole process in order to improve the development efficiency and product quality, and reduce the pollution to protect the environment.
Research on Changed Design of Gate Position of Window Frame of Automobile Front Door
Authors: Zhai Haorui , Xing Xin , Zheng ZhuAn , Sun Conggui , Teng Chen
Published: October 2019

The front door sash of the car is selected as the research object, and the design of the original gate position causes the warpage displacement of the front door sash to be large. Based on the CAE principle, using Molde×3D mold flow software analysis, it was found that the cause of the large amount of warpage deformation was flow imbalance. Then, according to the principle of flow balance, the design of the gate position was changed. The results of the mold flow analysis showed that the warpage displacement decreased from 18.5 mm to 14.1 mm, and the overall optimization was 24%. And the comparison found that the molding pressure was reduced from 224 MPa to 171 MPa (single cavity), and the clamping force was reduced from 2003 Ton to 1474 Ton (single cavity).
Research on the Trend of Structural Failures from Vehicle Body Spreader Based on ANSYS Analyses
Authors: Sun Duo , Guan Tianmin , Lei Lei
Published: October 2019

The operating conditions of the vehicle body spreader have been analyzed in this paper, and all the typical conditions have been applied with the nonlinear finite element analysis of the contact, aiming to ensure the safe utilization of the body spreader of tooling equipment for the production of rail vehicles. The potentially risky component locations are predicted and the weak spots are discovered on the basis of the analysis results of the static strength. The anticipation of the component failure trends shows a guiding role in the failure prediction in actual production and facilitates accident prevention.
Economic prospects of multiproduct manufacturing based on the Afrikanda deposit ores
Authors: Masloboev Vladimir , Fedoseev Sergey , Tcvetkov Pavel , Krivovichev Sergey
Published: October 2019

This article describes the results of the economic efficiency assessment of the Afrikanda deposit (Russia, Murmansk Region) development based on the Monte Carlo method. The project was divided into two phases: Phase 1 – production of perovskite concentrate, phase 2 - production of TiO2, Nb2O5, Ta2O5 and REE concentrate. Comparative evaluation was conducted for two options: only phase 1 and phase 1 + phase 2. Obtained results showed that the profitability as well as the payback period of the first option, which is less capital-intensive, can be in 1.5-2 higher. Despite this, the NPV of the first option is 5 times lower than the second, and there are prospects for further growing of this gap beyond the 15-year evaluation period. It was concluded that there are significant economic opportunities of the integrated deposit development, which may be implemented with additional measures of state support.
The Automatic Measurement System for Harmonic-drive Devices
Authors: Zheng Yuansong , Lou Zhifeng , Wang Xiaodong , Ling Siying
Published: October 2019

Harmonic-drive transmission finds many applications in industry, especially in manufacturing of industrial robots. As the key devices of an industrial robot, the harmonic drive reducers determine the robot’s performance, which includes the positioning accuracy, loading capacity, life time, etc. To satisfy the need of manufacturing high performance harmonic drive devices, development of competent measurement system is of great importance. An automatic measurement system with high-precision and multifunction is under development. The system consists of the power module, loading module, torque and rotation measuring module. The measurement and operation principle were explained. The factors affecting the accuracy of the measurement system were analysed. The control system was designed to realize the automatic loading and acquisition of torque and rotation data. The principle and measurement software of the control system were also introduced. Finally, a harmonic reducer with the gear ratio 120 was measured to verify the feasibility of the measurement system.
Evaluation and optimization of machining performance for rotary ultrasonic machining of Al/SiC composite material
Authors: Kumar Jatinder
Published: October 2019

In manufacturing industries, Al/SiC composite material is highly demanded due to its excellent properties. However, the difficulties in its machining restrict the application and competitiveness of this material. This investigation is aimed at studying the impact of different experimental conditions (feed rate, spindle speed, and ultrasonic power) on responses of interest (material removal rate, surface roughness, and chipping thickness) in rotary ultrasonic machining of Al/SiC composite material. The experiments have been planned by using full factorial design. Analysis of variance (ANOVA) is also employed to identify the significant factors and the optimized process settings for the different responses. The experimental results showed that feed rate was the most significant factor for material removal rate and surface roughness. However, all the factors were found to be insignificant for chipping thickness. From the surface topography analysis of the machined surface, no surface damage in the form of micro-cracks etc. was visible.
Mechanical performance of GNP/PLA nanocomposite under varied SPS process parameters
Authors: Adesina OT , Jamiru T , Sadiku ER , Durowoju MO , Ogunbiyi OF
Published: October 2019

The study examines the mechanical performance of GNP/PLA nanocomposite developed under varied SPS process parameters. The samples were fabricated using a novel Spark Plasma Sintering technique. In this research, the effect of sintering process in terms of sintering pressure and temperature has been studied by focusing on the mechanical properties of GNP/PLA nanocomposites. The densification of the samples was obtained via the Archimedes’ principle while hardness results was obtained using the micro hardness tester. The results show that the density and hardness increased with increasing sintering temperature and pressure. The samples were prepared under uniaxial pressure of 20 MPa and 30 MPa. The sintering temperature of 135 °C and 160 °C was used in developing the samples. The synergetic influence of these process parameters and graphene inclusion was significant in obtaining above 99% densification and with a concurrent enhancement in the hardness property of the developed composite.
Selection of the optimal heat treatment conditions using advanced phase transformation models
Authors: Bzowski Krzysztof , Rauch Lukasz , Pietrzyk Maciej
Published: October 2019

The paper focuses on the problem of optimal cooling cycle selection for steel sheets after hot rolling in order to obtain a given phase composition using complex numerical model. The proposed model driven by diffusion of carbon with the moving boundary (Stefan problem) was designed and implemented on the basis of Level Set equations coupled with diffusion equation. Application of implicit method for interface evolution allows to overcome the limitations associated with the complicated representation of material microstructure, but also in a natural way reflects the impact of front curvature and influence of chemical forces on the velocity of the interface. The article discusses the details of the model as well as the applied optimization technique. Three test scenarios are analyzed and the results are discussed.
Automatic Deformation Measurement Equipment for PZT Wafer
Authors: Ren T Q , Li X , Lou Z F , Wang X D
Published: October 2019

PZT wafers are the core driving parts to adjust the laser resonant cavity length of laser gyro. Usually, the PZT wafers are used in pairs, and the paired PZT wafers need to have close piezoelectric coefficient. To handle the pairing and screening of PZT wafers, an automatic deformation measuring equipment is developed by using a cartesian-coordinate robot frame, in which multiple photoelectric sensors are used to detect the key motion position automatically. Besides, vacuum absorption technology is also used in picking, carrying and placing PZT wafers to protect them from accidental injury. When driving voltage is applied to PZT wafer, the resulting micro displacement is measured by dual opposite inductive probes with relative measurement principle. This measuring strategy eliminates the influence of placement error of PZT wafers on the final measuring result. Compared with the existing manual measurement, the efficiency can be improved by 60%. The experimental results show that the equipment has high reliability and consistency. The measurement accuracy in full scale is no more than 0.5 μm and the repeat accuracy is superior to 0.1 μm.
Molecular Dynamics Simulation of Heat Transfer at Contact Interface of Hot Forming Die
Authors: Lu Baoshan , Wang Leigang , Ma Xiang
Published: October 2019

During metal hot forming process, the billet and the die interact by contact under high temperature, high pressure and severe sliding. In this paper, an atomistic approach is utilized to study the behaviour of heat transfer at the contact interface of hot forming die and the material. Based on non-equilibrium molecular dynamics and phonon scattering theory, the phonon heat transfer process at the billet/die rough interface at nano-scale is analysed. The effects of interfacial lattice defect concentration and average interfacial temperature on the phonon heat transfer coefficient are examined. It is found that when the lattice defect concentration increases the phonon mismatch at the interface deteriorates and the interfacial thermal resistance increases, which leads to a sharp decrease in phonon heat transfer coefficient. A higher temperature of the contact body and a higher average interface temperature lead to a higher probability of inelastic scattering of phonons at the interface. Moreover, the high frequency phonons at high temperature might be decomposed into two or more low frequency phonons during the energy transmission, which increases the propagation of phonon at the interface; thus the phonon heat transfer coefficient increases accordingly.
Minimization of Makespan Using FCFS and Gupta Method Comparison in Machine Spare Part Industry
Authors: Siregar I
Published: October 2019

Companies that produce spare parts for manufacturing industry machines are experiencing rapid development. The company produces production activities based on job orders where the process uses FCFS (First Come First Served) rules. Company scheduling often experiences delays especially on products have the same flow. The study was conducted to find the optimal sequence of scheduling with makespan minimization criteria using the Gupta Method and FCFS Method. The FCFS method used by the company produces makespan of 12.160,21 minutes = 202,67 hours. The recommendation method has a better level of performance compared to the company shown in efficiency index (EI) and relative error (RE). The EI value of the Gupta method is 1.14 which is indicates that the Gupta method has a good performance compared to the FCFS method. While the Gupta method RE value is 13,76%. The conclusion is Gupta method produces the minimum makespan value with a reduction of makespan of 178,15 hours. The Gupta method is a better method than FCFS method, which is shorter makespan, tardiness and flow time.
FMEA Approach to Analysis Crude Palm Oil Quality Parameters
Authors: Rizkya I , Syahputri K , Sari R M , Haryono J M
Published: October 2019

Palm oil companies are an important part of development in all countries, including in Indonesia. The development of the oil palm plantation business in Indonesia has experienced significantly progress. This condition can be seen from many companies set up the Palm Oil Factory (PKS) and the increasing variety of products can be produced from palm oil so that it can increase the selling value of the product. There are many problems faced by the palm oil industry in producing a product, one of them which is a quality problem. In the Crude Palm Oil (CPO) production process, it is known that the products produced are not in CPO quality standards. Products are not in this standard result in decreasing product quality and causing major problems for the company. Therefore, it is carried out to overcome problems above, an analysis is carried out by identifying the causes of the decline in the quality of CPO. Based on the results of the study, the highest RPN value of 280 was obtained with the cause of failure, namely the quality of raw materials is not good and is a type of failure which is the top priority for immediate improvement. The recommendation improvement can be done to prevent disability to carry out careful inspection of raw materials.
Determination of Total Labor Plant 1 using Workload Analysis (WLA) Method In Compound Fertilizer’s Industry
Authors: Ariani Farida , Siregar Khawarita , Tugiman
Published: October 2019

The compound fertilizer’s industry did trading as a first business in compost using Mahkota brand which is a subsidiary of Wilmar Group Indonesia, which became one of the largest agribusiness companies in the world. The results of preliminary observations show that the number of activities and methods of work done by each operator varies. Thus, the calculation workload against any worker in Plant 1 using Work Load Analysis (WLA) to calculate the percentage of productivity using the Work Sampling method. Furthermore, the excellent determination rating factor value using Westinghouse. The high determination Allowance values using tables Industrial Labor Organization (ILO). The results of the workload calculation show that the workload accepted by six workers is high because the value is above 100%. Proposed recommendations for improvements presented in connection with high workload conditions is to increase the number of workers as much as two workers so that the number of workers in Plant 1 is eight workers.
Reducing Waste in Spare Part Production Process with Lean Manufacturing Approach
Authors: Siregar Khawarita , Ariani Farida , Tambunan Mangara M
Published: October 2019

In the current era of globalization, competition in the industrial world is increasingly competitive, and then the manufacturing industry must be able to optimize its ability to compete. PT. ABC is a battery production manufacturing company that also produces engine parts for use on the company’s production floor. The inability to meet the punch needs to be used on the battery production floor is one of the problems faced by the company. In the punch production process, some activities are not needed such as operators looking for irregularly located support devices and operators repeatedly measuring the results of object feeding in the manual turning process because there is no standard measurement, which causes the grace period to belong. This study aims to reduce waste in a series of production processes or not valuable adding activities and shortening the total waiting time using the Value Stream Mapping tool. To identify waste, you must first know which activities are of added value and not value added. One method proposed to fix this problem is Lean Manufacturing. The result of using the Lean Manufacturing method is the proposed improvement is to eliminate activities that are less efficient and can reduce production time by 2897 seconds and reduce production activities with 17 events so that the production process is more efficient than before. It can be concluded that the waste that occurs is over processing and movement caused by work methods and machinery.
Optimization in Critical Work Center Using Theory of Constraints
Authors: Sari R M , Syahputri K , Rizkya I , Siboro N
Published: October 2019

Many companies experience problems or problems in the production process. One of the problems disturb the production process is the bottleneck. The pellet industry has problems in pellets production. The capacity imbalance available between the drying station and the milling station causes the pellet making process to accumulate resulting in a bottleneck. Therefore, an analysis is carried can be done to overcome these problems by overtime. Overtime is carried out for 1 hour on each shift and 2 hours on certain shifts in July 2019 period and September 2019 and the number of working hours becomes 18 working hours and 19 working hours from the previous one which is only 16 working hours at the milling work station because it is seen from a negative variance value and the percentage of load is below 100%. This shows that overtime can be effective to eliminate constraints.
Design of A Convolutional Neural Network System to Increase Diagnostic Efficiency of Alzheimer’s Disease
Authors: Al-azdi Faransi , Passarella R , Susanto A , Caroline C , Puspa RA Dwi , Yudha T W
Published: October 2019

The most common degenerative neural disease, Alzheimer’s disease (AD), is insidious and almost always requires imaging modalities to be diagnosed early. MRI is the most common one used, but requires timely interpretation. Here we develop a convolutional neural network (CNN)-based system that determines whether a brain MR image has AD or normal. First, feature extraction is performed to separate various parts of the brain. Then, the data is processed to differentiate normal brain from AD brain, solely using MR image. Finally, the neural network is supplemented using data from the patient’s history and physical examination. In this first phase, we were able to extract features from the brain MR image, initially by masking the image and separating the white matter, grey matter, and cerebrospinal fluid called the grey level co-occurrence method (GLCM). This method is able to using a convolutional neural network.
Analysis of Post-Combustion Concrete Study with The Addition of Superplasticizer
Authors: Karolina Rahmi , Malik Deni
Published: October 2019

This research explains that the use of superplasticizer admixture as an additional material in concrete mixes is expected to minimize concrete damage due to burning at high temperatures by increasing the quality of concrete in its mechanical properties which is compressive strength and physical properties which is concrete porosity. The variations in the addition of superplasticizer admixture used are 1%; 1.5%; and 2%, while variations in concrete combustion are 200°C; 500°C; and 800°C.The test results show a decrease in compressive strength and increase in concrete porosity due to combustion at high temperatures. The tendency of concrete compressive strength will decrease along with the increasing temperature. At the temperature of 200°C, a decrease of 7.14%; 40.57%; and 65.71% occurs, at the 500 °C, decreased by 2.74%; 15.07%; and 65.75%, while at 800°C decreased by 13.79%; 14.47%; and 53.95% of the initial strength of concrete without combustion. The porosity of concrete will rise along with the increasing temperature and the percentage increase will be greater along with the combustion temperature. At the temperature of 200°C there is an increase in porosity of 7.41% - 11,853%, at 500°C increased by 13,334% - 17,779%, and at 800°C increased by 19.26% - 23.704%, from normal concrete porosity.
Contribution of Solar Photovoltaic on the Reduction of Greenhouse Gas Emission in the Indonesia Power Sector
Authors: Nababan Wilson , Sihombing Hendrik V. , Kawai Hideki , Ambarita Himsar
Published: October 2019

Indonesia has released the target of reducing Greenhouse gas (GHG) emissions. The strategy includes enhancement renewable energy utilization. One of the most potential renewable energy resources in Indonesia is solar energy. State Electricity Company of Indonesia has planned to develop solar Photo voltaic (PV) power plan in the document planning 2019-2028. The objective of this study is to explore the contribution of solar PV to the reduction GHG of Indonesia. The potency of solar irradiance and solar PV output in several big cities in Indonesia are discussed. The results show that by using the PV technology of Crystalline silicon with mounting position building integrated and the slope and azimuth is 0°, the average solar PV output in Indonesia is 1361.2 kWh/kWp. The planned solar PV installed capacity by the end of 2028 is 985.5 MW. The electricity resulted by the system in a year will be 1341.47 GWh or it is only 0.31% of national electricity consumption. The contribution of solar PV to the GHG emission reduction is 1.341 million tons CO2eq in the year 2028.
Relationship Management Accounting and development of information technology
Authors: Erwin Keulana
Published: October 2019

The development of information technology has brought a change significant in business. The problems that occur at this time are still large barriers to management in decision making process. This is because there is still a lack of information that can be obtained quickly with the advent of information technology, there are several types of information systems that we can see, among others Decision Support System, Executive Information System, Accounting Information System, Accounting Information System, Expert System, Electronic Data Processing System, Management Information System, and Electronic Data Processing Systems. The research method used in this study is a qualitative method. The development of information technology too influential on the field of management accounting as a field information producer in the planning framework, controlling and decision making of management. The influence can be of a nature profitable or detrimental to the company.
Design of Hardware Module for the Vehicle Condition Monitoring System Based on the Internet of Things
Authors: Fahmi F , Nurmayadi F , Siregar B , Yazid M , Susanto E
Published: October 2019

One problem in the development stage of driverless cars on public roads is how to monitor the condition of the vehicle that is affected by different weather and environment, including dry, snowy or heavy rain conditions, which are sometimes difficult to predict and require monitoring systems that should be real-time and accurate. For this reason, an internet of things-based car condition monitoring system is needed to be developed. The development covers three essential parts, which include the development of hardware and digital communication modules, web server development and data analysis and mobile application development for monitoring. The purpose of this study is to design a hardware module needed for car vehicle condition monitoring system; a prototype completed with the onboard diagnostic module and embedded system that will send data to the server in real time. The system was successfully designed and developed using ELM327 and ESP32 with SIM808 for communication module. The benefits of this research are as a tool for asset management of car vehicles both for personal and corporate needs. This study also supports the development of driverless cars that require real-time data input between the vehicle and the server.
Sustainability Assessment of Natural Rubber Primary Processing: A Review
Authors: Sitepu Muhammad Haikal , Matondang Abdul Rahim , Sembiring Meilita Tryana
Published: October 2019

Natural Rubber is an important commodity for the world due to its valuable properties such as good elasticity and renewable. Natural rubber is used to produce various important products such as tire, sport equipment, and medical devices. With increasing demand for these products, the demand of natural rubber is projected to jump in the future. To fulfil this demand, the increasing of natural rubber production is unavoidable. However, to use natural rubber in producing those final products, it needs to flow through primary processing such as crumb rubber manufacturing process, crepe rubber processing and latex centrifuge processing. These processes become source of income for countries such as Indonesia, Malaysia and Thailand as well as citizen of those countries. Despite of these positive impacts, the environmental impacts of natural rubber primary processing such as greenhouse gas emission, waste, high water and energy consumption are identified. Thus, to maintain sustainability, monitoring of sustainability impacts from natural rubber primary processing is necessary. Sustainability assessment is a procedure to evaluate sustainability impacts of products, process and policies. This paper aims to review sustainability assessment process applied in Natural Rubber Primary Processing.
The Effect of Clamshell Ash Substitution to the Mechanical Properties of Concrete
Authors: Karolina Rahmi , Rezeki Ade Sri , Syahrizal  , Handana M.AP.
Published: October 2019

Concrete is the main material for construction that is widely used throughout the world. The more widespread use of concrete and the increasing scale of development also shows more and more concrete needs in the future. The era development of this rapid globalization era has resulted in the increasing number of used goods/waste whose existence can be a problem for life, one of which is the presence of clamshell ash. For this reason, many things have been done in order to recycle to overcome the problem of the existence of this waste. One of them is that clamshell ash can be used as a substitute for cement in a concrete mixture. This research uses clamshell ash and lime with variations of 0%, 5%, 10%, 15%, and 20% from the use of cement. The substitution of clamshell ash and lime affects the strength of the concrete. There are an increase in slump value with the substitution of clamshell ash by 8,9,11,13,14 and lime substitution by 8,8,5,10,12,13. There are a decrease in compressive strength on the substitution of clamshell ash by 89.18%, 74.09%, 67.87%, 64.92% of normal concrete and compressive strength on lime substitution by 69.84%, 58.53%, 57.05 %, 55.82% of normal concrete. There are a decrease in split tensile strength in the substitution of clamshell ash by 95.96%, 92.3%, 81.7%, 75.8% of normal concrete and split tensile strength on lime substitution by 87.93%, 81.33%, 65, 92%, 48.37% of normal concrete.
Effect of the surface grain refinement on the wear properties of A356/SiC composites
Authors: Yolcu Coşkun , Kahraman Fatih
Published: October 2019

Aluminum alloys are very attractive materials and have a wide application area in industry. However, their weak hardness property requires reinforcement and unavoidable use of particulate composite materials. Nevertheless, mechanical properties of the matrix can be important when sliding conditions are concerned especially wear. Therefore, post treatments can be used to obtain superior matrix properties after reinforcing. In this study, A356 aluminum alloy reinforced by using SiC particles with 5%, 10%, 15%, and 20% mass fractions were manufactured via stir casting process. To examine the effect of the grain refinement on the composites’ wear properties, A356/SiC composite samples were deformed with ultrasonic impact treatment for surface nanocrystallization. Optical microscopy (OM) was used to examine the microstructure, while scanning electron microscopy (SEM) was employed to determine the wear mechanism. Hardness tests and x-ray diffraction were also used to investigate the effect of deformation. Results showed that microstructure contains α-Al dendritic arms and eutectics silicon, and that the porosity increases with rising reinforcement fraction. Upon ultrasonic impact treatment, grains in the microstructure are observed to be oriented through impacts, and the increasing reinforcement fraction is seen to reduce the deformed layer thickness. Further, it is seen that peak broadening occurs, and that hardness values increase as a result of strain hardening upon completion of the treatment. Increasing reinforcement is detected to cause decreased hardened layer thickness, in consistent with microstructure examinations. Furthermore, wear tests showed that increasing reinforcement fraction improves the wear resistance, and that applying the treatment decreases the weight loss during wear tests.
Sets in ℝ^{𝕕} with slow-decaying density that avoid an unbounded collection of distances
Authors: Rice Alex
Published: October 2019

For any

d
∈

N

d\in \mathbb {N}

and any function

f
:
(
0
,
∞
)
→
[
0
,
1
]

f:(0,\infty )\to [0,1]

with

f
(
R
)
→
0

f(R)\to 0

as

R
→
∞

R\to \infty

, we construct a set

A
⊆

R

d

A \subseteq \mathbb {R}^d

and a sequence

R
n

→
∞

R_n \to \infty

such that

‖
x
−
y
‖
≠

R
n

\|x-y\| \neq R_n

for all

x
,
y
∈
A

x,y\in A

and
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="mu left-parenthesis upper A intersection upper B Subscript upper R Sub Subscript n Subscript Baseline right-parenthesis greater-than-or-equal-to f left-parenthesis upper R Subscript n Baseline right-parenthesis mu left-parenthesis upper B Subscript upper R Sub Subscript n Subscript Baseline right-parenthesis">

μ
(
A
∩

B

R
n

)
≥
f
(

R
n

)
μ
(

B

R
n

)

\mu (A\cap B_{R_n})\geq f(R_n)\mu (B_{R_n})

for all

n
∈

N

n\in \mathbb {N}

, where

B
R

B_R

is the ball of radius

R
R

centered at the origin and

μ
\mu

is a Lebesgue measure. This construction exhibits a form of sharpness for a result established independently by Furstenberg–Katznelson–Weiss, Bourgain, and Falconer–Marstrand, and it generalizes to any metric induced by a norm on 

R

d

\mathbb {R}^d

.