bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of Regional Comparative Advantages of Economic Crops in Henan Province Based on the Data Panel of 18 Urban Agriculture from 2017 to 2019
Authors: Yan Jianwei 
Published: March 2021

Abstract
It is of great significance to study regional comparative advantage of economic crops in Henan province in order to make the development plan of regional grain economy and forage and give full play to the advantages of characteristic agriculture. This article is based on Henan statistical yearbook data from 2017 to 2019, with 18 cities of Henan province as the research object, using scale, efficiency and comprehensive comparative advantage index, to discuss the construction of economic crop area comparative advantage problem. The study found that: in addition to vegetables which is of more production advantage area, scattered and in distinct features. Other economic crops have great regional difference, production concentration and obvious advantages features; The dominant regions are relatively stable, with little change, but there are obvious trend changes in the advantages of some regions (rising or falling); The regions with scale advantage does not necessarily have the efficiency advantage, the production scale and the efficiency have the important function to the regional crop production to have the advantage, both are indispensable. The government should do the following: Adjusting measures to local conditions, maximizing strengths and avoiding weaknesses; Winter agriculture and dry land agriculture should be developed, and intercropping and multiple cropping techniques should be popularized; Expanding the planting area of advantageous cash crops and strengthening the support of agricultural products processing enterprises; Accelerating innovation of agricultural science and technology and increasing proportion investment in agricultural research and innovation; improving regional agricultural infrastructure and raising the level of marketization.
Numerical Simulation to Determine the Effectiveness of Groynes and Breakwaters as Protective Structures for Gandoriah Beach, Pariaman City
Authors: Mera M , Chrisnatilova D 
Published: March 2021

Abstract
This research is about numerical simulation to determine the effectiveness of groynes and breakwaters as protective structures for Gandoriah Beach in Pariaman City (West Sumatra - Indonesia) using an existing program. The effectiveness of the protective structure can be seen based on the bathymetry that is formed as a result of this structure performance. In the simulation of the present research, the direction of the incoming waves at the offshore boundary condition is the dominant direction, namely the west direction, with two wave conditions, namely during normal and stormy times. Simulations of morphological changes are carried out in six scenarios. The first three scenarios are for wave simulations under normal conditions with no shore protective structures (scenario 1), with groynes (scenario 2) and with breakwaters (scenario 3). Meanwhile, the second three scenarios are for wave simulation in storm conditions with no shore protective structures (scenario 4), with groynes (scenario 5) and with breakwaters (scenario 6). The simulation results for the 20 days state show that in normal wave conditions, the breakwaters have a fairly good performance for the formation of sedimentation behind the structures so that it is estimated that the formation formed is tembolo. Meanwhile, groyne is only effective to restrain the sedimentation rate along the structures. In the wave simulation during stormy time, there is a dominant current along the nearshore. In this case the performance of the groynes is better than the breakwaters because the groynes can inhibit the rate of erosion along the shore. Due to the use of breakwaters there is erosion behind the structures. Based on the simulation results without shore protective structures, both in normal and storm waves, abrasion and erosion processes occur, so that Gandoriah Beach needs handling.
Optimization signal quality on cellular network based on Tilting-Antenna
Authors: Andre H , Ghozal M , Fitrilina  , Baharuddin  , Fernandez R , Asriyadi  
Published: March 2021

Abstract
The Difference of Strength and Quality Signal on cellular networks is affected by the traffic on cell and the shape of the region topology. One of the problems encountered in-service performance is overshoot caused by poor signal quality. Overshoot is a condition where a range of power exceeds the specified limits, till the MS (Mobile Station) is served by a distant cell and not from the closest cell. Overshoot occurs due to boosting power which aims to improve service quality when there is an increase in customer activity in the network cell. The antenna tilting method is an effective and responsive method to resolve overshoot problem since it can form cell coverage, cells identification, measure Rx and C/I (Carrier to Interference) levels.). The results showed that after tilting there was a change in cell identification from 5 cells to 3 cells. The value of Rx level increased from -92.8 dBm to -82.03 dBm for the 726-sector and -72.13 dBm to -70.27 dBm for the 727-sector, while the 725-sector remained unchanged. C/I value for <13 dB decreased from 47.20% to 13.68%, for a range of 13 dB values ≤ C/I ≤ 16 dB decreased from 17.63% to 12.73%, and for> 16 dB increased from 35.17% to 73.59%.
The effect of the core material of the Rogowski coil sensor on the sensitivity of the magnitude of partial discharge
Authors: Waldi E P , Winarta F P , Lestari A I , Fernandez R , Laksono H D , Aulia  , Rajab A , Nawawi Z , Ahmad M H , Hozumi N 
Published: March 2021

Abstract
The Rogowski Coil sensor is one of the sensors used to detect aging insulation, which is marked by the occurrence of Partial Discharge. Aging is damaged, which fails power tools when operated. If the insulation is aging and even causing damage, the distribution of electrical energy will be disrupted. This research presents two types of Rogowski Coil sensor core materials to detect Partial Discharge with the same number of turns. The number of turns is 5. The first sensor is a sensor with a ferromagnetic core and the second sensor is a sensor with a non ferromagnetic core. The test of the sensor is carried out by using a magnitude test using a charge calibrator as an imitation of Partial Discharge. The magnitude of the Partial Discharge read by the sensor uses a digital oscilloscope with an impedance of 50 Ohm. Measurement results compared to commercial sensors. The measurement results read by the oscilloscope found that the type of sensor core influences the magnitude value of Partial Discharge. The magnitude of the Partial Discharge sensor with a ferromagnetic core is greater than that of a sensor with a non ferromagnetic core. However, both results are much smaller than the commercial sensor even though the digital oscilloscope can read them.
Techno-economic analysis in application of glass solar cell on storey building: A case study of office building
Authors: Fadli H , Dalimi R 
Published: March 2021

AbstractUrban area populated by edifice and storey building can complicate process of electric energy distribution to the middle of city. Citizen reluctance if their settlement passed by transmission network or being built substation, and bigger cost of underground cable than overhead line increases such difficulty level. If there is problem in delivering electric energy, so the city will face electric energy crisis and disrupt society life. One of solution in overcoming that issue is by installation the glass solar cell (transparent solar cell) with thin film material (CdTe) on storey building, which located in the middle of city and its electric energy supplied by PLN. In this study, glass solar cell will be installed in existing building “W” with solar cell area about 6,916 m2. Glass transparency level of study object building is 30%, so by installing same transparency level of solar cell can supply maximum electric energy 897,184 kWh/year or equal to 35% electric energy demand of building. Economic feasibility analysis applied in this study, where NPV is IDR 398,961,738, IRR is 7.47% and the payback period is 11 years, so this technology is feasible to be implemented economically. If considering the tilt and azimuth angle of solar cell installation, instalment in B and C side of building generates smaller electric energy than A and D side. This condition caused by bigger reduction on solar irradiation energy that accepted by B and C site, namely 66.35% for B side and 67.22% for C side. The usage of glass solar cell contributes to deduct greenhouse gas emission, maximum 732,999 kg/year.
The use of edge cut on microstrip antenna patch with the modified partial ground plane for bandwidth enhancement
Authors: Fernandez R , Ra’id F , Andre H , Baharuddin  , Firdaus  
Published: March 2021

Abstract
This research proposes the use of edge cut on the antenna patch with a modified partial ground plane to overcome the inherent characteristic of the microstrip antenna, which is narrowband. The antenna has to cover all of the LTE frequency bands, which is from 0.824 – 2.4 GHz. FR4 epoxy with a dielectric constant of 4.4 and a thickness of 1.67 mm is used as a substrate for the antenna. The proposed antenna is simulated by an EM Simulator. The simulated results show that the return loss of -18.82 dB and the VSWR of 1.25. These parameters confirms that the antenna is well-matched along with the LTE bands. This wideband antenna has a directional radiation pattern with a maximum gain of 4.65 dB.
A Circular Patch Microstrip Antenna with Partial Ground Plane for WiMAX and WLAN Applications
Authors: Fernandez R , Putra T , Andre H , Firdaus  
Published: March 2021

AbstractNarrow bandwidth is the main problem of a microstrip antenna. Enhanced bandwidth is done by applying a partial ground plane. The antenna patch layer is a circular formed based on the formula to obtain its initial dimension. The dimension is used as a base for the antenna design with ground plane reduction. The antenna is designed using FR4, which has a thickness of 1.6 mm with a dielectric constant of 4.3. Simulation results from the design of partial ground plane antennas on WiMAX and WLAN band frequencies showed an increase in bandwidth of 3.14 GHz with minimum return loss values of -17.01 dB, gain antenna of 1.32 dB and a directional radiation pattern.
Design analysis of solar panel structure LAPAN-Constellation Satellite using finite element method
Authors: Ramayanti S , Budiantoro P 
Published: March 2021

Abstract
Satellite Technology Center (Pusteksat) of LAPAN currently develops a satellite constellation with communication mission. This satellite will implement a deployable solar array to perform its missions. The objective of this research is to find solar panel structure with natural frequency in accordance with the requirements of the launcher and have the minimum mass. This method starts by determining the requirement of solar panel structure and then designing the solar panel into three models as follow: solar panel structure with solid aluminium sheet model, isogrid and orthogrid model, and honeycomb model. The material used for solar panel structure for aluminium sheet and isogrid and orthogrid model is Al 7075-T6 because the material is light in weight and has a high stiffness to withstand loading conditions. Meanwhile, for solar panel structure honeycomb use aluminium alloy 5052 for both face and core follow the previous satellite. The next step is analyzing the natural frequency of three models solar panel structure with modal analysis. This study shows that solar panel with honeycomb model give the best option as a solar panel structure on a constellation satellite. From the result, it can also predict the modal shapes that can be used as a place to lay the accelerometer when testing and measuring natural frequency on vibration test machines.
Solid Waste Management System Model of Village Tourism Area of Nagari Tuo Pariangan, Indonesia
Authors: Aziz R , Ruslinda Y , Yeni Y S , Dewilda Y 
Published: March 2021

Abstract
NagariTuoParianganis one of the three leading tourist attractions in Tanah Datar Regency. The increase of tourists visits NagariTuoPariangan Area has resulted in increased waste generation, improperly managed existing solid waste management endanger the environment, and sustainable development. This study aims to develop a solid waste management system model of NagariTuoPariangan as an effort to preserve the environment and support tourism development. The generation of solid waste of this area was 786,803 kg/day, with the largest were food waste as 35% and plastic waste of 32% of total waste. The solid waste management system model considers three categories of sorting types (compostable, recyclable, and residue), while the storage use of individual type (trash bags and bin) and communal (bin 40 L, 6 m3 containers). The collection system uses a 1.5 m3 motorized pedicab. The processing method applies composting, enumerating plastic waste, selling paper, and metal waste to the collectors. Moreover, the residue transport using a 6 m3 arm roll truck from the recycling center (TPS 3R) to Bukit Sangkiang Landfill. Meanwhile, the non-technical aspects planned for regulation on waste management by WaliNagari, the formation of Non-Governmental Organizations, adjusting funding according to applicable regulations, and increasing the participation of traders, communities, and visitors.
Defect analysis on PVC pipe using Statistical Quality Control (SQC) approach to reduce defects (Case Study: PT. XYZ)
Authors: Ginting R , Supriadi S 
Published: March 2021

Abstract
Product quality is an important factor affecting the level of development and progress of a company. Statistic Quality Control (SQC) as a quality control tool for production can help companies whether the products produced are still under control or not from the initial process or the final product. The research was conducted at PT. XYZ to find out the causes of defects that occur in the PVC pipe production process. In the research, it is known that the defects that occur are melt, crack and hollow with the majority of defects that occur are melt and crack. By using a Cause and Effect diagram, it is known that the cause of defects occurs due to human, machine, materials and method factors. Solutions for defects that occur are given in the hope that the company will implement the solutions offered to reduce the number of defects that occur in the production process.
Production Scheduling Optimization to Minimize Makespan and the Number of Machines with Mixed Integer Linear Programming
Authors: Farizal F , Gabriel D S , Rachman A , Rinaldi I 
Published: March 2021

Abstract
In production management field, production efficiency can be improved through minimizing machine downtime, optimizing production scheduling, minimizing inventory of raw materials and finished products. In this research, the production efficiency is improved through optimizing production schedule that has two goals; not only minimizing production makespan but also minimizing the number of machines used. For the purpose, a mixed integer linear programming (MILP) model was developed. The model was used to solve a problem producing 6 products with 4 production lines. In this study, product demand was first forecasted with Autoregressive Integrated Moving Average (ARIMA) method. Optimization results comes up with makespan of 295.4 hours using only one production line. As addition, this research is also dealing with three real life production scenarios.
Effect of rock sugar as a pore-forming material on the physical and mechanical properties of hydroxyapatite scaffold
Authors: Indra A , Hadi F , Mulyadi I H , Affi J , Gunawarman  
Published: March 2021

Abstract
Hydroxyapatite (HA) ceramic scaffold had been made using the pressureless sintering method for bone scaffold applications. Micron- and nano-sized HA as the primary material with the addition of polyvinyl alcohol (PVA) as a binder and rock sugar (RS) sized 298-420 μm as pore-forming material had been prepared. RS was applied to produce interconnecting pores in the HA scaffold. The green body was made by uniaxial pressing method at a pressure of 200 MPa. Preheating was carried out at a temperature of 700°C with a holding time of 1 h, aimed at eliminating PVA and RS, and then the temperature was increased to 1200°C with a holding time of 2 h. During the sintering process, the heating rate and cooling rate were maintained at 3°C/min. Physical and mechanical properties were tested respectively, including porosity and compressive strength testing. The results showed that the 23.0% porosity obtained a compressive strength value of 15.6 MPa at a ratio of HA:RS of 65:35 wt%. The highest porosity of 48.4% was obtained with a compressive strength of 4.9 MPa at a ratio of 55:45 wt%. In this study, the maximum addition of RS was only at 45 wt%, while the addition of RS reaching 50 wt% or more could affect the tangential bonding between HA powders during the sintering process.
Lift Study of a Flapping MAV Wing Design Based on Bat Wings
Authors: Suhaimi S , Shuib S , Kadarman A H , Yusoff H 
Published: March 2021

Abstract
Bio-inspiration is a design ideation method that uses observations found in nature to solve a mechanical problem. In this study, a simulation study of a micro air vehicle (MAV) wing design that is based on bat wings was done and validated experimentally. The wing model was generated using an in vivo observation where the margin wing shape was traced and then used to generate a flat wing with a margin shape of a batwing. The lift of the wing was studied at 4m/s wind speed with a flapping angle of 55°, and at the angle of attack from 0° to 35°. The simulation was done using ANSYS V1.6 software and the experimental study was done using an open circuit subsonic wind tunnel. It was observed that the wing has a stall angle of 25° and a CLmax of 3.2. The result also shows that the difference between the simulation and the observation result to be small with 0.2% at the smallest point and 5% at the largest point. This shows that the simulation model was valid and can be used for future wing design.
Crack Analysis on Ti-6Al-4V ELI Coated with Commercial Hydroxyapatite for Implant Material: Literature Review
Authors: Ardhy S , Gunawarman  , Affi J , Yetri Y 
Published: March 2021

Abstract
Ti-6Al-4V Extra Low Intertitial (ELI), a type of titanium alloy that is commonly used for implant material. However, use of Ti-6Al-4V ELI still has some problems. The main one is oxide layer on the surface can be detached during application due to corrosion process. Such corrosion debris is a toxic substance to the human body. It is, therefore, necessary to modify the surface of the implant to avoid corrosion process by using coating method. A good coating material for orthopedic implants comes from ceramics, namely hydroxyapatite (HA). However, there are also an obstacle, HA coating on titanium, sometimes not evenly across the surface, causing cracks on the coating layer surface. There are two methods that are often used in coating materials, namely Electrophoretic Deposition (EPD) and Dip Coating. This study analyzed number of literatures using a searching engine of international reputable journals Science Direct, Pubmed on biomaterials and biomedicine fields using the keywords of Ti-6Al-4V ELI, hydroxyapatite, cracks, EPD method and Dip Coating. This literature review may useful for the readers and researchers, in order to choose the best method for crack reduction in the coated implants. Dip Coating method is better than EPD method in point of view simplicity and cost. Moreover, the coating layer is evenly distributed, no build-up of HA in several surface areas, so that cracks on surface are minimized.
Comparison of Physical and Mechanical Properties of Antifouling PVDF Membranes by Titanium Dioxide and PES Membrane by Titanium Dioxide
Authors: Mataram A , Nukman  , Nasution J D , Riadi M I , Pataras M , Aditya B B , Septano G D , Anisya N , Nadiyah N A 
Published: March 2021

Abstract
The main factor to support daily life is water, but the fact is there are approximately 2.1 billion people currently threatened with a shortage of clean water. Polyethersulfone (PES) and Polyvinylidene Fluoride (PVDF) are polymers that are commonly used for membrane fabrication because they have extraordinary properties in the screening process. The addition of addictive substances into the membrane formation process is no less important as supporting the ability to be even better in membranes Titanium Dioxide (TiO2) as an additive with properties relevant to the two polymers which can cover the shortcomings of the two polymers. The printing process of PVDF and PES membranes with the addition of TiO2 uses a copper plate which is flowed with an electric field of 15000V DC. The results of the surface morphology of Scanning Electron Microscopy (SEM) both showed extraordinary changes compared without modification to the printing process as in previous studies. The tensile strength test results showed uniformity with the membrane morphology and an increase in the maximum stress value of the membrane to 3.86 MPa. Surface roughness values can help identify membrane impurity properties which are also relevant to the results of water treatment performance tests and contact angles. Finally, the process of forming membranes with the additional modification of the printing process can open new avenues to maximize water treatment performance and service life on the membrane.
An Improved Method for Dynamic Behaviour Prediction of Carbon Fibre Reinforced Epoxy (CFRE) using Finite Element Model Updating
Authors: Shah M A S A , Yunus M A , Rani M N A , Mirza W I I W I , Sani M. S. M. 
Published: March 2021

Abstract
The dynamic behaviour prediction scheme of carbon fibre composite structures are extremely challenging to be performed due to the geometrical ply-by-ply properties and the ply orientation issues. In this paper, a laminated carbon fibre reinforced epoxy plate with elastic and linear layers was used with aim to investigate the dynamic behaviour of the carbon fibre reinforced epoxy using practical modelling scheme via finite element modelling and updating method. A simplified FE model of the CFRE plate was developed using shell element properties known as PSHELL to represent geometrical laminated properties. Subsequently, the dynamic behaviour of the FE model was calculated using Nastran SOL103. Potential updating parameters of the FE model was analysed and identified using the sensitivity analysis. The model updating method was then used to update the initial FE model of the CFRE plate based on the experimental modal analysis (EMA) result. The comparison of the results were used in verifying the accuracy of the updated FE model of the CFRE plate. The result suggested that the PSHELL properties can be used efficiently to represent the geometrical laminated properties of the CFRE plate without considering the geometrical effect of ply-by-ply properties.