bluuebunny/crossref_metadata_2025_split huggingface dataset:
Progressive Collapse Behaviour of VLCC under Longitudinal Bending
Authors: Rizkiani Tsumiratin , Ramadhan Muhammad Iqra , Alie Muhammad Zubair Muis 
Published: October 2019

Abstract
The aim of this study is to analyse the ultimate strength of VLCC subjected to longitudinal bending moments under hogging and sagging conditions. One-frame space in the mid-ship section of VLCC is taken to be assessed. The Nonlinear Finite-Element Analysis method (NLFEA) is adopted in this study. The boundary and loading conditions are applied on both sides of the ship cross section. The Multi Point Constraint (MPC) is imposed to the cross section based on the neutral axis references. The element type is SHELL 181 is used on the model. The meshing size is 500 mm, and the arc length method is applied to solved the load and shortening curve. The initial imperfection, cracks and welding residual stress are ignored. The result obtained by NLFEA method for ultimate strength in hogging and sagging are 10,83x1012 Nmm and -10,34x1012 Nmm, respectively. It is shown that the ultimate strength obtained by NLFEA is larger than Smith’s method, and the ratios of the ultimate strength comparison are 7,71% and 11,27% for hogging and sagging conditions, respectively.
Garbage Compaction Mechanism of Three-Wheels Electrical Motorcycle
Authors: Alfaroq  , Putera Andi Cahya Adi , Rahman Abdul , Muhammad Abdul Kadir , Syam Rafiuddin 
Published: October 2019

Abstract
This research aims to design a trash in a three-wheels electric motor with a compaction mechanism so that it can increase the volume of the trash than usual and the jack mechanism that reduces human power for waste management. This developed also includes a garbage cover with a cover mechanism that can block the smell of garbage when open or closed. The mechanism is controlled using a microcontroller and the actuator used a stepper motor. This tool has been tested using garbage and the equipment is running well.
Identification of Ground–fault Current in Various Transformer Connection and Generator Grounding using Symmetrical Components Method
Authors: Sultan A.R. , Mustafa M.W. , Saini M. , Gaffar A. 
Published: October 2019

Abstract
Single line to ground-fault (SLG) fault is the record frequent fault probable to occur in an electric power system. The effect of ground-fault is determined by using grounding method and transformer connections. In this study, the simulation showed the performance of a simple power system within the SLG fault in the system at various transformer connection and generator grounding method. New approach the application of ground fault current calculation using symmetrical components method on unit generator transformers. A symmetrical components method applied with simulation was conducted in Matlab software. The results were then analyzed, presenting a comparison with the fault impact at various transformer connection and generator grounding method. The models of transformer connection for each side (primary and secondary) used were wye (Y), wye-grounded (Yn) and delta (Δ). It was clearly shown that the ground-fault currents at the generator bus had significantly an effect on the type of the transformer connections used during the ground-fault at the secondary side of the transformer.
Experimental Study for Measuring Density of slag melts by An Established Archimedean Double-bob Method
Authors: Arman  , Takebe Hiromichi 
Published: October 2019

Abstract
The apparatus of Archimedean double-bob method for practicing accurate was established for density measurements of slag melts. The accuracy of density measurements at room temperature to establish measurements was determined in the following ways. Firstly, the densities of water were measured at 25, 30, 35, and 40 °C. Secondly, the densities of silicone fluids with the viscosities 0.01, 0.999, 4.850, and 29.44 Pa·s were measured at 25 °C. The measured densities have good agreement with the data of water standards with a precision of 0.07% and silicone fluid standards with a precision of 0.16%. The densities of Na2O–SiO2 slag melts with 60, 70 and 80 mol % SiO2 were measured in the temperature range from 1350 to 1500 °C. The density decreases with increasing temperature and increases with increasing SiO2 contents for all compositions. The reproducibility of this work is within the error estimation of density measurements. The density results of Na2O–SiO2 melts with 60, 70 and 80 mol % at 1400 °C show that the measurements data are within 0.23 % of the density values.
Investigation of Creep Behaviour of Al-9Zn-4Mg and Al-9Zn- 4Mg-5Cu Alloys
Authors: Syahid Muhammad , Sofyan Bondan T. 
Published: October 2019

Abstract
Two aluminium alloys, Al-9Zn-4Mg and Al-9Zn-4Mg-5Cu was prepared for candidate material impeller turbine radial inflow system Organic Rankine Cycle (ORC) that works at 130 °C. The temperature is high for aluminium alloys so the creep behaviour of the alloys have to investigated. This study identified creep resistance of the alloys and also investigated the creep mechanism of the alloys. Creep test conduct at 50 MPa and variation temperature 150, 200 and 250 °C. The fracture surface and microstructure of subsurface was examinated by SEM. The creep test result showed both of alloys did not failure at 150 °C while Al-9Zn-4Mg-5Cu has a good creep strength compare with Al-9Zn-4Mg at temperature 200 and 250 °C. The fracture surface and microstructure of subsurface indicate the coble creep mechanism or difusional creep. The good creep strength of Al-9Zn-4Mg-5Cu due to CuAl2 phase serves as a pin which inhibit the rate of diffusion at the grain boundaries.
Preliminary study on Acoustical Characteristics of Sago Midrib Composite
Authors: Kusno Asniawaty , Asriani Sherly , Kamil Kusno , Jamala Nurul 
Published: October 2019

Abstract
This research is a preliminary study on the use of sago midrib as an acoustic material. This study aims to determine the sago as acoustic material by measuring the absorption coefficient using (impedance tube method) of 100 Hz-1.6 KHz frequencies. The results of measurement were analyzed and compared with common acoustic material available on market as reference. From the measurement of the sago midrib composite, absorption coefficient has fluctuated from low to high frequencies as the absorption coefficient of reference material is found to be more stable.
Control of a tethered Quadrotor using a quaternion feedback
Authors: Takeuchi Ryuta , Watanabe Keigo , Nagai Isaku 
Published: October 2019

Abstract
In Japan, superannuation of infrastructures poses a problem and the application of unmanned aerial vehicles (UAVs) such as a Quadrotor etc. is being actively studied as one of ways of inspection. Such a Quadrotor needs any position control independent of GPS, when being used for the inspection of tunnels and of interior of building. In previous research, Ouchi et al. proposed a method for controlling the position of a Quadrotor using a tether. In addition, they derived the dynamical model of the Quadrotor considering the influence of a tether, and conducted some experiments on the attitude control. The objective of this study is to realize angle and angular velocity control in the tethered Quadrotor by applying quaternion feedback control proposed by Fresk et al. In the quaternion feedback controller, the angular velocity obtained from the gyro sensor is directly available in the controller design, so that there is a possibility that more stable attitude control can be performed. After giving the overview of the tethered Quadrotor and describing Quaternion feedback control, this paper gives some experiments to verify that it is more stable with an actual machine, compared to the conventional method.
Experimental Analysis of Smart Green House with Rotary Garden
Authors: Sutresman Onny S. , Syam Rafiuddin , Muchsin Abdul Hay , Djafar Zulkifli , Arief Syahrier , Mochtar Andi Amijoyo , Hayat Azwar , Sutresman Onny S , Amiruddin  , Radja Abdul Mufti 
Published: October 2019

Abstract
To overcome climate change that affects agriculture in all over the world, shows the estate and farming for the raising of the extreme weather (e.g., floods, droughts, etc). Therefore, the smart greenhouse is essential in providing sustainable food for humans. The application of Smart Greenhouse, The ultimate and most common monitored variables are temperature, moisture, the intensity of sunlight and environmental conditions to support the using of sunlight a source of electricity. This is necessary for the Smart Greenhouse to manipulates the environment in appropriate to its plant’s needs. In this case, the temperature and humidity in the greenhouse are important to keeps the productivity of the plants. So, it’s using automatic system to keep suitable environmental conditions as explained before for the plants. In this research, the smart Greenhouses is shaped Ferris wheel to make sprinkling and radiation of sunlight for plants is equally distributed for all plants and its parts, Based on the results of this experiments with rotary mechanical system for Smart Greenhouse as well shown that Smart Greenhouse can preserve suitable temperature and moisture for growing the plants.
Numerical solutions to anisotropic FGM BVPs governed by the modified Helmholtz type equation
Authors: Syam R. , Fahruddin  , Azis M. I. , Hayat A. 
Published: October 2019

Abstract
The Boundary Element Method (BEM) is used for obtaining solutions to anisotropic functionally graded media (FGM) boundary value problems (BVPs) governed by the modified Helmholtz type equation. A technique of transforming the variable coefficient governing equation to a constant coefficient equation is utilized for deriving a boundary integral equation. Some particular problems are considered to illustrate the application of the BEM. The results show the convergence, consistency, and accuracy of the BEM solutions.
Improving Energy Efficiency of Hybrid Beamforming System
Authors: Lee Seulgi , Lee Won-Seok , Shim Seong-Joon , Kang Tae-Hoon , Song Hyoung-Kyu 
Published: October 2019

Abstract
Hybrid beamforming which combines conventional digital beamforming with analog beamforming system is promising model in wireless communication. The problem is using RF chain in digital precoder spends high cost and variable phase shifter exist at analog precoder processing network. Dealing with this problem, many architectures emerge to make lower hardware complexity and power consumption. This paper proposes low-resolution solution using phase over-sampling(POS) and switches(SW) on Radio Frequency(RF) chain to improve energy efficiency. We analyze proposed POS-SW hybrid beamforming system. In the simulation, the estimate is channel capacity in different signal-to-noise and energy efficiency during increasing number of RF chain on 3 dimension(3D) channel environment. It is shown that the proposed system has almost same channel capacity and high energy efficiency compared to the conventional system.
Miniature directional coupler with different dielectric parameters
Authors: Quang Hung Luu , Huu Tan Pham , Knyazev Nikolay S. 
Published: October 2019

Abstract
A study aimed at identifying the effect of substrate parameters such as dielectric permittivity and thickness on the characteristics of directional couplers, whose dimensions are reduced by means of compact structures. It was found that with the increase in the thickness of the substrate in a compact coupler increases the frequency band and the degree of miniaturization, and with increasing dielectric constant Vice versa.
Miniature Directional Coupler with Two Operating Frequency Bands
Authors: Khac Khiem Nguyen , Quang Hung Luu 
Published: October 2019

Abstract
The design of the directional coupler with reduced physical dimensions, using compact structures. The proposed coupler operates at two Central frequencies, 900 and 1900 MHz. The use of compact structures instead of quarter-wave segments made it possible to reduce the standard coupler by 67%, with minor performance degradation.
Natural Light Property-Based LED Lighting System to Maintain Human Circadian Rhythm
Authors: Jeon Geon-Woo , Seung-Taek Oh , Lim Jae-Hyun 
Published: October 2019

Abstract
The cyclic properties of natural light give an effect on human health, and the intensity and wavelength of natural light are known to be important factors to maintain human circadian rhythm. However, modern people who stay longer indoors are exposed to the fixed light environment of artificial lighting, resulting in circadian rhythm imbalance and subsequent sleep disturbances. In this paper, a LED lighting system that reproduces the natural light properties with day cycle is proposed to support the human circadian rhythm. To do this, the properties of natural light that keep changing were measured and analyzed every hour, and then the color temperature and wavelength ratio of natural light over time were reproduced by controlling each channel of LED lighting. In order to confirm the effect of the proposed lighting that supports maintaining a circadian rhythm, a confirmation experiment of melatonin change in the animal body was performed. The experimental results showed that the rats irradiated with the proposed lighting had an increased melatonin level by more than around 20ng/ml compared to the rats irradiated with the general lighting, thus confirming that the proposed lighting had a positive effect on sustaining the circadian rhythm.
Analysis of Orbital Movement Lunar Orbital Station
Authors: Chongrui Du , Koryanov Vsevolod V. , Danhe Chen 
Published: October 2019

Abstract
Represents the new project “Deep Space Gateway (DSG)” - an orbital station in the vicinity of the Moon [1]. The DSG can be used as a staging post for exploration missions to the lunar surface and eventually to other deep space destinations including Mars. It is also a platform in a location where the human and technological challenges of long duration human missions in deep space can be investigated and addressed [2]. A DSG may be placed farther from the Moon in halo orbit relative to its position on the line of the Moon-Earth, known as the L2 Lagrange point. One of the modern orbits of interest as a destination for a spacecraft in cis-lunar space is the Near Rectilinear Halo Orbits (NRHO) [4]. This work is devoted to the study of issues related to the orbital movement DSG, to understand which orbit will be optimal.
Stabilizing Attitude Control For Mobility Of Wing In Ground (WIG) Craft - A Review
Authors: Matdaud Z. , Zhahir A. , Pua’at Afifi. A , Hassan Aziz , Ahmad M.T. 
Published: October 2019

Abstract
Wing in ground crafts development have been rapidly advancing in recent years. The current paper reviews the researches and developments of existing stability control system technology’s development and enhancement for wing in ground effect crafts. The review is critically intended for the development of the control system for two-seater Dragonfly 2, a hoverwing type craft. The current review will commence with the introduction on the theory behind the in ground effect phenomenon on the crafts, its regulations and the types of wing in ground crafts, their advantages and disadvantages, and their stability and control issues. This paper also discusses the available attitude control sys-tem types of wing-in-ground craft (WIG), its experiments, simulations and computational methods done especially on both the lon-gitudinal and lateral motion stability.
Numerical Optimization of Rectangular Mufflers with Multi-channel Splitters Using the Simulated Annealing Method
Authors: Cheng Ho-Chih , Chiu Min-Chie 
Published: October 2019

Abstract
Rectangular mufflers internally hybridized with splitters have been extensively applied in industrial noise abatement. However, there has been a palpable lack of academic work directed toward space-constrained mufflers conjugated with multi-channel splitters that disperse venting fluid and reduce secondary noise. That being so, an analysis of the Sound Transmission Loss (STL) of rectangular mufflers internally hybridized with multiple parallel splitters that are optimally designed to perform within a limited space will be considered, here. By using an acoustical lumped method, a four-pole system matrix for evaluating the acoustic performance (STL) emerges. During the optimization process, the simulated annealing (SA) method, which is a robust scheme utilized to search for the global optimum by imitating a physical annealing process, is used. Before dealing with a broadband noise, the STL’s maximization relative to a one-tone noise (250Hz) is offered to confirm the SA method’s reliability. Moreover, the mathematical model is also checked for accuracy. To appreciate the influence of acoustical efficiency with respect to the design parameters, the sensitivity analysis of six design parameters (dh: the diameter of a perforated hole; W: the width of air channel; R: acoustic flow resistivity of the acoustic fiber; σ : the porosity of the perforated plate; Df: the thickness of the acoustic fiber; L1: the horizontal length of the splitter) is performed. Subsequently, to bring into focus the acoustical interaction with respect to the number of air-channels (between the splitters), three types of mufflers (mufflers A∼C) hybridized with one, two, and four air-channels (with parallel splitters) have been surveyed. Results divulge that for a rectangular muffler internally conjugated with a one-channel splitter, the maximal STL is located at the desired tone. The acoustical performance of a rectangular muffler will increase and the induced back pressure will decrease simultaneously if the number of the splitters internally conjugated within the rectangular muffler increases. Consequently, optimally designed rectangular mufflers with multiple parallel splitters that avoid secondary noise induced by high speed flow while simultaneously maximizing acoustical performance within a constrained space are preferable.
A High Reliability 3D Object Tracking Method for Robot Teaching Application
Authors: Chen Yan-Chun , Weng Wei-Chan , Lin Shi-Wei 
Published: October 2019

Abstract
3D Object tracking is the task of capturing the 3D position and pose of an object from each time-series image frame. As we known, 3D sensing technique can be realized by stereo vision, structured light, and ToF (time-of-flight) camera. All of them can capture the point cloud data for describing the depth information in a workspace. In past research, the reliability in 3D object tracking was a big problem for real industrial application, therefore, we address a different way to enhance the tracking accuracy and stabilize the tracing path for raising the reliability. In order to build a 3D tracking model and the workspace environment, we adopted an RGB-D camera which is the Intel® RealSense™ D400 Series depth modules to collect the cloud point data and RGB values. The built 3D tracking model should contains the information which includes points, normal and texture for producing many 2D object images with different perspectives. Then the produced images were fed to a SSD (single-shot detector) neural network to learn the object’s features for 2D tracking. In dynamic tracking process, the image frames were through the sematic image segmentation by DeepLabV3+ for only extracting the object information without hands and background. Thus, the reserved data only included object’s cloud point data and texture information in workspace. Then we use the iterative closest point (ICP) algorithm and the RGB intensity correlation method to confirm the object’s position and posture in workspace. The result shows that our method has a better performance than SSD method for tracking a self-predefined object.
Design of Adjustable Switching Power Supply with Current Type Single-Ended Flyback Output
Authors: Huang Chia-Wei , Du Jun-Yu , Hsu Wei-Tai 
Published: October 2019

Abstract
This study is based on the UC3845 controller, designed a flyback switching power supply, which has a wide input voltage range, high output voltage accuracy, and high load regulation. According to the characteristics of flyback switching power supply and UC3845, adding filter circuit, a feedback circuit, protection circuit, etc., develop a single-ended flyback switching power supply with adjustable output, stable and reliable, and high efficiency. According to the simulation results, it can be seen that the designed switching power supply has high output voltage accuracy, and the input voltage in the range of 200V∼240V, the accuracy of the output voltage is kept within 1.3%; the voltage adjustment is less than 1%, The output ripple factor is kept below 0.09%, and the output voltage is adjustable.
The Optimization Wire Drawing Die Design for Aluminum A1050 and A1070
Authors: Sheu Jinn-Jong , Wang Bao-Shan 
Published: October 2019

Abstract
Wire drawing is a common used process to reduce the diameter of a small rod or a wire. The parameters of drawing die design such as die angle, bearing length, entrance fillet, and the drawing ratio of each pass are crucial to control the quality of a drawn wire. Taguchi method was adopted to optimize the drawing die geometry design. The lubrication conditions were taken into consideration to observe the effect of friction on the dimension accuracy of the drawn wires. The optimum combination of the drawing die design using 20% of reduction ratio is semi die angle 9 degrees, bearing length 1.2mm and entrance fillet 0.4mm. Two types of aluminum alloy 1070 and 1050 were tested using lubricants sodium sulfide (Na2S), graphite, and drawing oil, respectively. The lubrication effect of sodium sulfide is the best to achieve the lowest drawing load. The lubricant Na2S had the best performance in terms of lowest maximum drawing force for both of A1050 and A1070. The final diameters of the drawn wires were very close to the specification 4.0 mm. The CAE simulations were able to find the optimum design of die. The designed drawing machine was capable of carrying out the experiments and obtains consistent results.
Application of the zero thickness interface element approach to the upper bound limit analysis of shallow tunnel excavation
Authors: Lee Y L 
Published: October 2019

Abstract
The aim of this study is to apply the zero thickness element approach to investigate the upper bound value of limit analysis with the different failure mechanism of a shallow tunnel excavation in soft clay. This interface is modelled as a contact element with zero thickness and with the Coulomb's friction behaviour. The procedure of numerical analysis adopted the zero thickness element particularly developed and installed into the finite element program in the laboratory. A series of finite element analysis is used to investigate the solutions of stability and simulate the soil progressive failure mechanism due to a shallow tunnel excavation. Four geometry of failure mechanism are taken into account the effects of overburden depth and critical collapse ratio. According to the results obtained, the upper bound values between the limit equilibrium analysis and the numerical calculation are theoretically coincidence, and also the progressive failure mechanism of cohesive soil can be practically predicted. The numerical analyses show that the predicted stability ratio is in reasonable agreement with the analytical solutions in the limit analysis.
Finite element numerical simulation analysis based on ultrasonic phased array
Authors: Chen H X , Fan D L , Fang L , Zhang G Y , Cao C H , Huang W J , Huang J M , Yang L 
Published: October 2019

Abstract
In this paper, the ultrasonic phased array technology is used to detect the defects in the welded seam test specimens. Using pulse echo method to detect a specimen with defects and establishing the corresponding numerical model. At the same time, the finite element is used to simulate the propagation of ultrasonic waves in the defective test specimens, and figures of the sound pressure amplitude are obtained. Compared with the theoretical values, the experimental values and the simulated values show good agreement, and the errors are only - 1.37% and 4.11%, respectively. The results show that the ultrasonic phased array with finite element simulation is effective.