bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evaluation of photovoltaic power station operation under the influence of natural environment
Authors: Zhang J H , Miao S H , Li Y W , Zhang D , Guo S Y 
Published: October 2019

Abstract
This paper presents a method for evaluating the operation statute of photovoltaic power plants. It considers the impact of various kinds of natural environment. Firstly, by analysis the impact of different natural factors on photovoltaic power generation, we can find the most influential factors that affect the output of photovoltaic power station. Secondly, use these factors as a standard to separate the natural environments into different kinds. Thirdly, use the AHP method to establish an indicator evaluation system and multiple indicator weight determination methods for different environments. Then, setting proper formula to evaluation the operation statue of photovoltaic power station. Finally, in part 7 a case is proposed to illustrate the present method.
Production calculation model considering variable start-up pressure gradient in ultra-low permeability reservoirs
Authors: Li C L , Zhang Y 
Published: October 2019

Abstract
Ultra-low permeability reservoir fluid presents nonlinear flow, pressure sensitive effect, permeability changes, resulting in starting pressure gradient changes. At present, the problem of variable-start pressure gradient and pressure-sensitive effect is not considered in the existing production calculation method. To solve these problems, based on the percolation theory of ultra-low permeability reservoir, this study established the variable-start pressure gradient production calculation model based on the pressure sensitivity effect by using the pressure-sensitive effect formula and other laboratory experiment results. Taking Block C of Chaoyanggou Oilfield as an example, the main influencing factors of development effect under the condition of variable start-up pressure gradient are analyzed. The results show that the start-up pressure gradient leads to a significant decline in oil well production. When the variable start-up pressure gradient and pressure sensitive effect are considered simultaneously, the effective production radius of the oil well decreases, and the production of the oil well varies nonlinearly with the change of pressure. Compared with the calculation results of the non-Darcy seepage production model, the calculation accuracy of the model in this paper is improved by 4.17%.
U.S. Renewable Energy Policy: The Experience of Advanced Research Projects Agency-Energy
Authors: Qian X M 
Published: October 2019

Abstract
ARPA-E is playing an important role in developing revolutionary energy technologies that may impact US energy status. The role has become a powerful engine for new energy innovation in the United States. ARPA-E adopts a very flexible organization and management mode, and its operating mode has become a model for small organizations within the US government. In order to strengthen ARPA-E, the U.S. government has increased investment in recruiting talents, team culture, and technology research and development. The ARPA-E project in the United States has formed standardized procedures, systems and regulations in the management of new energy research projects, and can effectively and efficiently implement these contents, forming management characteristics and playing a high reference role for other countries’ new energy research and development.
Modeling of Vertical Dynamic Vibration Characteristics on Vehicles Suspension System
Authors: Ka’ka Simon , Himran Syukri , Renreng Ilyas , Sutresman Onny 
Published: October 2019

Abstract
Vibrations often interfere with driving comfort for riders and passengers. Variations in loads, especially for four-wheeled vehicles, bumps, hollow road surfaces, and other forms of road damage will greatly affect the vehicle suspension work system. This research aims to (1) further test the effect of vertical dynamic load of the vehicle and change the dimension of resistance on the road surface, (2) the contribution of spring and shock absorber to the load fluctuation of the vehicle. Experimentally these load fluctuations are replaced by pneumatic actuator forces of varying magnitude based on the regulatory pressure of the regulator. The deviations generated by the varying load work are measured by placing a proximity sensor along the spring movement. The vertical dynamic load transformation up to the road surface is measured using a "Load cell" mounted under the wheels of the vehicle. Characteristics of vertical dynamic vibration occurring due to several dimensional barriers, U (cm) obtained using mathematical modeling method with 2 DOF suspension system transfer function. The results showed a condition on the body and wheels of vehicles experienced a brief overshot for 0.14 seconds with deviation of 0.178 m. From the graph shows that the rate of deviation that occurs is large enough that Y2d = 1.03 m / s caused by a sudden shock that occurred on the wheels of the vehicle. This condition does not last long that is only duration t = 0.22 s, because the contribution of springs and shock absorbers that can absorb vibration is 25% to the vibrations caused by the vertical load of the body and the axis of the vehicle.
Enviromental Geochemistry of Bawakaraeng Mountain Soil: Implication for Anthropogenic Impact Gowa South Sulawesi Indonesia
Authors: Tonggiroh Adi , Syam Rafiuddin 
Published: October 2019

Abstract
Determination of heavy metal are done on Mount Bawakaraeng soil to find out the impact of anthropogenic, using range proximity matrix independent variables on camps, fired, garbage. There are two concentrated heavy metal zone and two particular zone (sample point 29, zone I; sample point 3 and 5, zone II) as concentrated heavy metal on rocks fractures, lavene statistic probability show the source of heavy metal Cr are different. Surface soil samples are taken on mapping variable, forest fires, especially for top and bottom of soil only garbage variable are taken. Furthermore, using Inductively Coupled Plasma Oscilloscope Emission Spectrometer (ICP-OES), X-Ray Fluorescence (XRF). Rock Samples analysis are done using thin section method on polarized microscope to find out the composition of volcanic minerals. EF range are higher and lower than 2 are showing the enrichment of heavy metal are naturally formed and EF relatively moderate by human activities. (Igeo) camp are Cr (0.606), Cu (0,529), Mn (0.383). Zn (0.590) Cd (-0.779). Pb (0.440); fired are Cr (0.586), Cu (0.514), Mn (0.383), Zn (0.590), Cd (-0.770), Pb (0.447); garbage is Cr (0.584), Cu (0.461), Mn (0.343), Zn (0.579), Cd (-1.110), Pb (0.458). the difference of EF and Igeo value are affected by sample point 3;5;29 and indexes value 1.5 on volcanic rocks soil. Friedman test are showing relatively small differences between human activities and nature factor, which indicating that Bawakaraeng Mount morphology are easily affected by exogenic and endogenic factors.
Beneficiation of Lateritic Iron Ore from Malili Area, South Sulawesi, Indonesia Using Magnetic Separator
Authors: Sufriadin  , Widodo S , Trianto M 
Published: October 2019

Abstract
The increasing demand of sponge iron as raw materials in steel industry nowdays has led to increase the effort in obtaining such materials from various sources. This study aims to characterize and beneficiate of a lateritic iron ore sample from Malili area of South Sulawesi. Mineralogy of the ore was investigated by means of X-ray diffractometry (XRD) and microscopy techniques; whereas chemical composition of the sample was determined by using X-ray fluorescence (XRF) spectroscopy. Result of mineralogical analysis indicated that ore sample consists of goethite, magnetite and chromite. The ore shows fine grained size with accicular texture. Chemical analysis reveals that sample is composed of Fe2O3 32.8%, Al2O3 35.5%, SiO2 21.0%, Cr2O3 7.2%, MnO 1.5%, and NiO 1.2%. Sieving of 20 kg iron ore sample was carried out to separate into five size fractions: (+212)μm, (-212+180)μm, (-180+150)μm, (-150+90)μm and (-90)μm with mass distribution of 12.0kg; 2.8kg; 0.9kg; 1.8kg and 1.6kg respectively. Each feed fraction was further treated by using dry low-intensity drum magnetic separator to produce concentrate. Result of each fraction having the mass percentage of 15.5%; 31.7%; 30.7%; 32.0% and 40.0% with the respective iron content (Fe2O3) of 45.0%; 47.9%; 43.9%; 46.7% and 47.2%. The Fe2O3 grade of concentrate in all fractions have narrow range values, but the mass percentage of concentrate increase significantly with finer grain size fraction. The highest Fe2O3 recovery was found to be 89.82% with -90 μm size fraction.
Car Driver Drowsiness Recognition Android-Based System
Authors: Indrabayu  , Mufti Siti Khumaerah , Areni Intan Sari 
Published: October 2019

Abstract
The growth of the number of vehicles in Indonesia especially in terrestrial mode is also offset by the increasing number of accidents. One of the main causes of traffic accidents is due to drivers who driving in drowsiness. This condition leads to loss of concentration and even awareness of the driver. The drowsiness recognition system built into android smartphone platforms which owned by almost all walks of life, can help the community and government in providing direct warning especially to motorists while driving in a drowsy state. The method used is the Haar-Cascade Classifier to detect the driver's face and utilize the detectable face size ratio to create ROI in the mouth area. Then the using of the FindContour algorithm to find contours in dark areas when the mouth is open because it evaporates. The size of the contour will be compared to the Mouth ROI size for the drowsy driver's decision. System creation using Android Studio with C ++ and Java programming languages, as well as OpenCV libraries for Haar-Cascade and FindContour. Based on the test to 10 respondents, the accuracy of the system recognizes sleepiness on the driver reached 88.7% during the day.
Audial comfort optimalization of The Lanraki Biringkanaya Makassar Church room
Authors: Ishak Muhammad Taufik , Asniawaty  , Sulistyowati Dwi Retno 
Published: October 2019

Abstract
Church is one of the unique worship buildings which is full of audial activities such as speech, songs, and music. The purpose of this research is to evaluate and give redesign suggestions so that the audial comfort in the church room can be achieved. Quantitative research method by analyzing data with the statistically-descriptive. Reverberation time was calculated by the Sabine formula, redesign using Autodesk Ecotect Analysis 2011 program, and the questionnaire processed by IBM SPSS Statistics 25 program. The results conclude that the sound pressure level distribution has been spread evenly, while the background noise and the reverberation time in the church room still exceed the standard. But overall, the user has felt comfort with the condition of the audial church room. So, we made change of materials and furniture that may affect the value of reverberation time and background noise in a room. We hope this research can be a reference to design the next church or similar buildings.
Experiments on Motion and Oscillation Controls of a Gantry Crane System Using Parallel Proportional Controllers
Authors: Muhammad A K , Tandioga R , Ka’ka S , Lewi L , Rahman A , Taufik A 
Published: October 2019

Abstract
The purposes of this research are to formulate the mathematical model of the system, to propose an effective control scheme and to perform experiments on a laboratory scale. The system used in this paper consists of a trolley, a pendulum as load and a dc motor to drive the trolley. Mathematical model of trolley position and load angle were formulated considering voltage of the motor and damping constant of the air calculated specifically using energy balance. Two proportional (P) controllers were designed in parallel in such a way to drive the trolley and to reduce oscillation of the load. The system and the proposed control scheme were confirmed through experiments. The experimental results revealed that the motion and oscillation of the system can be controlled effectively.
Experimental study on the influence of draft relative due to wave transmission energy coefficient on hanging sheet pile breakwater
Authors: Paotonan Chairul , Rahman Sabaruddin , Umar Hasdinar , Rachman Taufiqur , Baeda Achmad Yasir , Agustinus M , Hidayat Alif 
Published: October 2019

Abstract
Rubble mount breakwateris recently become the most widely used breakwater, consist both of natural and artificial stone. It required a large dimension of structure so that the investment costs become more and more expensive. One of the solutions that can be implemented is Hanging Sheet Pile breakwater. Unfortunately, the performance of this type of breakwater has not been known yet. Performance of this breakwater represented by wave energy transmission coefficient (KEt). Therefore, this study aims to examine the effect of relative draft (s/d) and relative wave height (H/s) to KEt. This study conducted in Ocean Technology Laboratory of Universitas Hasanuddin. The parameters studied are structure dimensions and wave parameters. Wave parameters consist of wave height (H) and wave period (T), while the structure parameter is the draft structure (D). The result of this study shows that the greater value of both incident wave steepness (Hi/gT2) and structure relative draft (s/d), then the smaller of KEt value will be achieved. Also, the greater relative H/s, the smaller KEt will be achieved. For all cases of study, the transmission coefficient ranges from 0.122 – 0.786.
Analysis of Daylight Distribution on Building Height and Space Depth.
Authors: Jamala Nurul , Wika Annajma Nurul , Kusno Asniawaty 
Published: October 2019

Abstract
Lighting design is one of the priorities in designing buildings. Natural lighting can reduce energy consumption in buildings. Aesthetic levels are the basis of the planning concept, but need to pay attention to the concept of using natural lighting, in order to realize the energy-efficient building design. The purpose of the study was to determine how the level of illuminance affects the opening area, depth of space and height of the building. Quantitative research method is to analysis statistical data from measurements of illuminance levels in space. The results of the study concluded that the level of illuminance in the meeting room of the Center of Technology building in Hasanuddin University exceeded the illuminance standard. The extent of openings in the building envelope affects the illuminance level in space. Natural light distribution affects the height of the building's floor and the depth of space. Based on this conclusion, it is expected that in designing a building it is necessary to pay attention to the building facade, so that the distribution of natural light is not too high into the building and to avoid negative effects such as glare, high brightness and contrast.
Development of a foldable personal mobility vehicle with one drive wheel
Authors: Sakata Takanori , Nagai Isaku , Watanabe Keigo 
Published: October 2019

Abstract
As a form of new transportation, cooperation of Personal Mobility Vehicles (PMVs) and a public transportation facility attracts attention from a viewpoint of an environmental load. Various compact PMVs adopting the attitude control technology of an inverted pendulum have been already developed. However, it is reported that attitude control becomes unstable under the influence of road surface irregular and level difference in the vehicle using this attitude control. Thus, a foldable three-wheel style PMV is developed in this research. By folding up, carrying into a public transportation facility called a railroad or a bus becomes easy. Moreover, static stability is sustained to the body by being grounded with a total of three wheels, two of which are used in front part whereas one is used in rear part. This needs no introduction of attitude control, which is to make the attitude stable under the influence of a road surface, so that the risk of a fall of a driver can be reduced. Furthermore, the number of sensors and the number of motors can be reduced by setting not to use attitude control and a drive wheel to one. Thereby, the manufacture cost of the body can be held down. Therefore, it is economical, so that it is thought that general spread is easy. This paper reports the outline and design of hardware to be developed, the running speed control technique, and some running performance experiments to be conducted.
Kinematic Motion Control for Robot Mobile Manipulators as Fire Fighters
Authors: Syam Rafiuddin , Sutresman Onny S. , Fahruddin  , Tonggiroh Adi , Amiruddin  , Radja Abdul Mufti 
Published: October 2019

Abstract
The purpose of this research is to make mobile manipulator robot as firefighting, to derivate kinematical formulation for mobile robot manipulator system, beside that is to make control system of such robot. The design and experiments were conducted in a mobile manipulator study as a firefighter. The result of this unmanned robot unmanned robot design can still carry the appropriate the standard sprinkle of firefighting system. The design of mobile manipulutor mechanism is done by using 3 SolidWorks 2010 design software design. The process of making robot begins with mobile robot as base frame and then installed the robot manipulator. Direct control method was done in this research by using arduino mega as interface system. The conclusion of this research is that robot can move with direct control and autonavigation for tracking trajectory case as firefighting system.
Synthesis and Characterization of Ni-doped ZnO Thin Films Grown by Sol-Gel Spin Coating
Authors: Gareso P.L. , Pakabu Monika , Rauf N. , Juarlin E. , Aryanto Didik 
Published: October 2019

Abstract
ZnO thin film doped with nickel has been grown by sol-gel spin coating technique. The thin films were prepared using zinc acetate dehydrate, ISO propanol, and ethanolamine as a precursor, solvent, and stabilizer respectively. For dopant, Nickel (II) acetate tetrahydrate with different concentration of Ni was added to the mixture. The sol-gel was deposited on a corning glass substrate at room temperature with a speed rate of 3000 rpm during 60 seconds. The Ni-doped ZnO thin films were put into a tube furnace for heat treatment at 500°C for 60 minutes. The characterization of the film was studied using X-ray diffraction (X-RD), and the optical transmittance UV-Vis measurements. The X-RD results show that a good crystallite was clearly observed in a hexagonal wurtzite structure with preferential orientation of (101) plane. The optical UV-Vis measurements show that the transmittance value increased with increasing the concentration of a dopant percentage. The optical band gap of Ni-doped ZnO was in the range of 3.20 – 3.23 eV.
Optimization of rotation speed parameters and number of grinding wheels on the quality and production capacity of chicken feed pellets
Authors: Rasyid Syaharuddin , Muchtar Muas , Susanto Tri Agus 
Published: October 2019

Abstract
This paper presents an experimental design approach for the optimization process parameters for the chicken feed pellets. To achieve this goal, the speed parameters and number of grinding wheels are selected and two levels of this parameter are considered. Design of expert (DOE) of tests was used for experimental design and analysis of results. The chicken feed ingredients mixture is formed into pellets using a grinding wheel pellet machine with a variation of 150, 200 and 250 rpm rotation and variations in the number of grinding wheels 4, 6, and 8 pieces. The highest pellet production capacity (26.2 Kg/hour) occurs at 200 rpm rotating speed and 4 pieces of grinding wheels. The highest engine efficiency (87.6%) occurs at 200 rpm rotating speed and 4 pieces of grinding wheels. The highest pellet durability (91.6%) occurs at 200 rpm rotating speed and 4 pieces of grinding wheels. Optimal machining parameters are recommended to produce a pellet production capacity response of 25.6 Kg/hour, 85.53% efficiency machine, and 91.473% durability pellets are 150-225 rpm rotation speed range and 4-5 pieces grinding wheels.
The true working performance inversion simulation analysis of Jinping level-I arch dam
Authors: Zhang G X , Liu Y , Zhang L , Liu Y Z , Li S H 
Published: October 2019

Abstract
Jinping Level-I Super-high Arch Dam, which is up to 305 m high, ranks the highest among all the arch dams that are built up and under construction in the world. But various technical problems have appeared in the design and construction of the super-high arch dam. Therefore, it is necessary to precisely evaluate and predict the temperature, stress and deformation and address the working performance well during the construction, which is critical for the dam construction quality and safe operation of the dam. By performing a whole-dam whole-process simulation analysis, the paper discusses the true load simulation, the simulation of the transverse joint, adiabatic temperature rising model and efficient technologies to resolve difficulties for the super-high arch dam. The whole-dam whole-process simulation analysis platform – SapTis is used to conduct simulation computation in order to track the true working performance of Jinping Level-I super-high arch dam during its construction. Through analysis of the monitoring data and inversion simulation of the computation parameters, the paper simulates the current working performance of the dam, predicts late-stage response, researches the various problems occurring in the construction to come up with effective solutions. The use of the inversion simulation analysis helps have a whole picture of the true working conditions and performance of the dam during its construction, water impounding and operation and guarantee the dam construction quality and operation safety, while creating a new technology solution for the control of high arc dam construction quality.
Structural design and strength analysis of multi-ring packed flywheel with heavy metal alloy segments
Authors: Jiang L , Zhang W , Wu C W , Zhang L P , Zhang Y X , Liu Z Y 
Published: October 2019

Abstract
Flywheel, as a kinetic energy storage and conversion device, has promising applications due to its high efficiency, no pollution and long lifetime. In particular, with a three-layer structure packed with heavy metal alloy middle layer, a flywheel can achieve both a large rotational inertia and a high energy density. To guarantee structural strength safety of this type of multi-ring packed flywheel operating at high temperature, structural and thermal stress analysis for a flywheel with a tungsten alloy layer sandwiched between two stainless steel layers is carried out using finite element method (FEM). Based on plane stress assumption, flywheel stress characteristic along radius under assembly force, centrifugal force and thermal loading is demonstrated. The results show that, the rise of temperature causes inconsistent thermal expansion between neighbouring layers and results in a large thermal stress. Particularly, a high circumferential tensile stress occurs in the middle layer. It is also found that, the segments of the middle tungsten alloy layer can efficiently relieve the inconsistent thermal expansion and lower the thermal stress. Moreover, the number of segments significantly influences the efficiency of thermal stress releasing and the reserved gap between adjacent segments significantly improves the contact pressure between inner hub and tungsten alloy layer. This work may provide reference for structural design of the multi-ring packed flywheels under thermal loading.