bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Roles and Benefits of Cooperative Producers of Coffee Margamulya in Java Preanger Coffee Agribusiness
Authors: Djuwendah E , Karyani T , Sadeli A H , Hapsari H
Published: October 2019

Cooperative Producers of Coffee Margamulya (CPCM) is one of the cooperatives that help coffee farmers in Pangalengan to access capital and market with other parties. This research aims are : (1) to identify the performance of Coffee Producers Cooperative Margamulya, and (2) to identify the role and impact of cooperative in agribusiness java preager coffee. The research design used is qualitative descriptive with case study method. The research result showed that Margamulya Coffee Producers Cooperative had an important role in the development of Java Preanger coffee farming in terms of procurement of production input, facilitation of production process, product marketing, financial service, business risk minimization, and human resource development. The impact of cooperative’s activities on the success of coffee farming are: ensuring the continuous input supply with cheaper price, standardization and improvement of product quality, increasing production volume, establishing effective distribution network, providing price guarantee, reducing the risk of production failure, and increasing the income of farming.
Development Model of Community Forest in Bulukumba Regency, South Sulawesi, Indonesia
Authors: Nuraeni  , Rasyid R , Rosada I , Ilsan M , Saida
Published: October 2019

Forests as a model of national development have significant benefits for the living and livelihood of society. It gives balance and dynamic benefits in either ecological, socio-cultural or economic sides. The study aims to develop a development model of community forest in Bulukumba Regency, South Sulawesi, Indonesia. The selection of respondents was carried out purposively, namely selecting respondents who were involved in community forest management. Methods of data collection in this study were conducted through interviews, discussions, questionnaires and field surveys. The respondents came from various experts and stakeholders related to community forest development activities. The secondary data collection was obtained from literature sources and documents from related institutions with this research. The analytical method used is a dynamic system analysis method for community forest development in Bulukumba Regency consisting of needs analysis, problem formulation, system identification and model simulation. The research result showed that the dynamic model of community forest management was built with three (3) sub-models, namely; community forest area, community forest production, and economics of the community forest. The scenarios built in this community forest development model are a combination of four (4) aspects, namely the policy of community forest development, the effectiveness of the nursery, the management system and the existence of counselling. The simulation result of the community forest development model in Kajang District was the optimistic scenario.
Peanut Productivity Under The Albizia Stand In Agroforestry System
Authors: Susanto A , Mujiyo  , Purnomo D , Budiastuti MTh S
Published: October 2019

An effort to meet the national food need is by utilizing productive forest areas under albizia stands. Food stuff such as peanuts can grow under albizia forest stands. The purpose of this research was to know success of agroforestry system implemented to tree after initial release of contract. This study was conducted under albizia stand of state forest Blitar in East Java. Research design was used in this study was randomized block design. 4- year- old albizia stages with 0%, 25%, 50 % trimming intensity with plant spacing of 2 m x 3 m, 3 m x 3 m, 3 m x 4 m. Albizia trees that used for this comparison as many as 120 albizia trees. Results showed that soil lies under 4-year-old albizia trees still produced peanut with highest weights 129 g/m2 and lowest weight 117 g/m2 while highest biomass about 115.10 g and lowest biomass about 98.23 g. Application of agroforestry system under 4-year-old albizia stand is still good and intensive, creating work, improving social welfare, local community opinion change into positive perceptions for forestry development, forest protection, forest fire prevention, reducing rapid forest degradation and environmental quality conservation of forest areas.
Study of The Potential Expansion of New Rice Fields in Central Maluku District to Support Food Security in Maluku Province
Authors: Rusmin N , Edy S , Robby A , Dwi K R
Published: October 2019

Central Maluku district is one of the priorities region in the development of paddy fields in the province of Maluku. Maluku province was only able to meet the needs of 58% of the rice. Fulfillment needs rice is one of the Government’s efforts in food self-sufficiency. Increased agricultural productivity through the extension of new rice fields became one alternative settlement in fulfilment of rice. The increase in rice production through the expansion of rice fields is still possible. The success of the process of the expansion of paddy fields depend on the expansion of the activities in the rice production. The process of the expansion of rice fields is preceded by feasibility investigation location. Feasibility study of the site was conducted to find out the feasibility of potential land with the observations in the field which is then processed and spatial dianalis in using ArcGIS software. Results of a survey investigating the Central Maluku with the total area of 594.29 ha based on the suitability of the land for the potential expansion of new acres of rice paddies 587.35 ha from 2 (two) subdistricts include North Eastern Seram Subdistrict Kobi m2 170.87 ha and North Seram Subdistrict covering 416.82 ha.
Gauss polynomials based modelling of grid-connected PV system output power in high-altitude area
Authors: Wang S , Zhao S J , Ma Y Y , Gao D D
Published: October 2019

Complicated ordering management and improper providing electricity are a problem encountered during the PV system generate electricity. Accurately predict the output power is an effective approach for minimizing these problems. In this paper, electric power exchange relationship of each link is analysed, according to the topology of the photovoltaic (PV) power stations. We propose the under prediction model of output power, based on the theory model of output PV current in the high-altitude environment. The composite error could be calculated by the difference between the under prediction power and the measure power. Comprehensive error expression is obtained by using the high-order polynomial fitting method. An improved prediction model, which adapts to the high-altitude environment, is established, while compensate the original model with the composite error. Compared with the actual output power of the PV power station, the results show that the curves of the two are highly consistent, the correlation between the two is more than 0.8 and the relative error between the predicted and measured power is less than that of the under-predicted power model. The results show that the improved predictive power model has a good tracking performance.
An Engineered solar crop and meat dryer for rural Africa: A techno-economic outlook
Authors: Kanyarusoke K E
Published: October 2019

This paper introduces a new solar crop dryer design for small scale entrepreneurs going into crop storage and marketing. It is an indirect drying system requiring 2 m2 ground space for installation of both the 2 m2 collector and the 1 m3 dryer chamber. Both collector and dryer are designed de-novo, and manufactured to give one assembly. The assembly is then analysed for heat and mass transfer using both TRNSYS and MATLAB software. For places with an equatorial climate, the system is predicted to be adequate for a start, with daily moisture removal limits of between 12 and 15 kg. This translates to a drying rate of about 20 kg/day wet produce from 75% to 12% moisture content. An economic analysis is done for two cases of direct manufacture and importation. In either case, it is found that breakeven is possible within the first one to two years of acquisition for high value products - in part because of the heavy crop and price losses currently experienced with sun drying. It is therefore concluded that the new product may not only be helpful in reducing food waste, but that it might also have economic viability to commercial entrepreneurs.
Status and trend analysis of solar energy utilization technology
Authors: Sun T Q , Cheng D L , Xu L , Qian B L
Published: October 2019

Based on global distribution of solar energy and its feature, this paper discusses a review about solar energy’s utilization techniques, mainly discusses the latest development of photo-thermal and photoelectric utilization technology, which are mature and widely used. Through looking forward to the development trend of solar energy utilization from the aspects of improving efficiency, reducing cost, and diversifying utilization methods etc., we find that the utilization of solar energy resources has entered the fast track of development. In order to promote the connectivity of solar energy technologies and standards and to enhance the capacity of the solar energy industry, this paper put forward the advices on setting up an international platform for technological innovation and cooperation to make efficient use of global technological innovation resources.
The applications of echelon use batteries from electric vehicles to distributed energy storage systems
Authors: Pan A Q , Li X Z , Shang J , Feng J H , Tao Y B , Ye J L , Li C , Liao Q Q , Yang X
Published: October 2019

Echelon use batteries from electric vehicles will bring not only the cost reduction of energy storage but also the social benefits of circular using of resource, energy conservation and emission reduction. It is an important echelon use orientation that retired batteries from electric vehicles are rebuilt into distributed energy storage systems. The article introduces 8 cases of distributed energy storage systems containing echelon use batteries, whose application scenarios include load shifting, renewable energy storage, frequency modulation of power system, and capacity charge management. In summary, the reconstruction of echelon use batteries is based on battery packs or modules in order to reduce the cost of their secondary development as much as possible because the advantage of echelon use batteries is low cost after all. Echelon use batteries should be used under the regime of low rate and / or shallow charge-discharge for the sake of their cycle life and safety. Besides, a set of distributed energy storage system containing retired batteries from ROEWE e50 electric vehicles was developed by us and its application effects in a distributed PV generation station was introduced. Ten 3P3S retired batteries modules with similar capacities are rebuilt a 5 kWh energy storage system with 50 V rated voltage, whose energy transition efficiency is about 88%. Energy storage applications of retired batteries from electric vehicles in distributed PV generation not only supply electrical loads with stable power, but also achieve peak shaving of solar electric power.
Distribution characteristics of circular grounding ground potential in HVDC transmission system
Authors: Wang L D , Mo F J
Published: October 2019

This paper presents a model of double-ring type grounding pole unequal depth embedding for high-voltage direct current (HVDC) transmission system; and introduces calculation formula of DC ground potential distribution when double-ring type grounding pole is unequal buried. Furthermore the ground potential distribution and stride voltage level around the grounding pole and influence of grounding depth and soil parameters on the current field are discussed in this paper. The electric field zoning model of the ring current source is established by using the power system grounding pole analysis software CDEGS to verify the feasibility of this method. As the model is able to make the grounding current overflow density and potential distribution as uniform as possible, there is no serious local current concentration.
Location support system for energy clusters management at regional level
Authors: Szewrański S , Bochenkiewicz M , Kachniarz M , Kazak J K , Sylla M , Świąder M , Tokarczyk-Dorociak K
Published: October 2019

This study provides the location support system solution for the new Polish Energy Policy to 2040. The Location support system combing geographic information system (GIS) with business intelligence (BI) analytic environment is developed. The Decision Support System in this research integrates three renewable energy sources (RES): biomass, solar and wind. The renewable energy technical potentials are analyzed in relation to the local human development index (LHDI) and the average use of low-voltage electricity [kWh per capita] in rural households. The research indicates internal diversification of the country in terms of energy consumption, level of development and potential to renewable energy production. The most developed rural areas are in the west of the country and in the vicinity of large cities. Regions suitable for biomass production are located in S-W and W part. The best conditions for solar energy sector are in the S, S-E and central regions. Good wind conditions are in central Poland and locally at the Baltic coast as well as in sub mountainous regions in the south. The newly developed analytical system can be effective instrument, which can strengthen the production and consumption of renewable energy in rural areas. As an added value, it should improve the quality of life of local communities. The results of the study support decision makers in sustainable energy cluster allocation and management.
Research on electrified railway power router based on 81 level conversion technology
Authors: Shu Y H , Zhang C Z , Wang Q
Published: October 2019

On the premise of realizing the application of renewable energy power generation in traction power supply system, aimed at the problems of power scheduling and operation cost in the traction network of 27.5 kV electrified railway, a kind of electrified railway energy router device based on 81 level conversion technology is proposed. The device adopts 81 level converter to realize the high voltage, high power quality and high power demand of grid-connected converter for electrified railway energy supply system. The energy dispatching mode of voltage-phase angle is adopted to ensure the normal power supply of electric locomotive and the voltage support of traction network. At last, the bidirectional converter of the energy storage unit realizes peak cutting and valley filling of energy and ensures the stability of renewable energy generation. Based on the theoretical study of the topology, technical principle, energy scheduling calculation and control strategy of the new electrified railway power router, the device was simulated and verified, and the effectiveness of the electrified railway power router technical solution was verified.
Calculation method of distribution network limit line loss rate based on fuzzy clustering
Authors: Yuan X Y , Tao Y L
Published: October 2019

In view of the characteristics of 10kV distribution network lines, in order to analyze the line loss rate and determine the loss reduction space, this paper proposes a calculation method of the limit line loss rate (LLLR) based on a series of current LLLR indicators. Firstly, according to the difference between different line characteristics and operation parameters of distribution network, the index which has a high impact on the LLLR is screened out, then the clustering index parameters are extracted, and clustering analysis is carried out by using the fuzzy C-means algorithm. According to the clustering results of feeders, the reference feeders are selected for each type of feeders, and the equivalent resistance method is used to calculate the LLLR under the limit conditions. For intra-class non-reference feeders, the adjustment coefficient method is used to calculate the LLLR, and the LLLR is corrected by checking whether the line loss rate obeys the normal distribution. Taking the distribution network data of a city as an example, the LLLR is calculated, which proves the validity of the method.
Study on transnational environmental damage along the belt and road and its enlightenment on international energetic policy
Authors: Lu W
Published: October 2019

This paper selects the most tabular areas of Central Asia and Southeast Asia along the route of Belt and Road Initiative and analyzes the causes and current situation of the cases of transnational environmental damage in the two regions. Through the data and charts, this paper sums up the present situation of the co-existence of nuclear pollution and Aral Sea crisis in Central Asia and the serious pollution of water resources caused by frequent fire in Southeast Asia. And this paper analyzes the impact of this environmental situation on the formulation and implementation of energy policy along the Belt and Road.
Simulation of Hydrogen Combustion Characteristics in Argon-Oxygen Compression Ignition Engine using Large Eddy Simulation (LES) Turbulence Model
Authors: Nasruldin Muhammad Arif Arsyad , Mansor Mohd Radzi Abu
Published: October 2019

Hydrogen combustion in a noble gas atmosphere will increase thermal efficiency because of higher specific heat ratio. During the compression stroke, noble gas produces a higher temperature at the same compression ratio compared to standard air compression. Argon is the best noble gas in this study because it is abundant and readily available. In this study, argon replaced the nitrogen and formed the argon-oxygen atmosphere in a compression ignition engine. The objectives of this study are to determine the suitable initial temperature for simulation work based on the experimental value and to study the effect of injection parameter changes towards combustion and emission characteristics. This study uses Converge V2.4 CFD simulation based on Yanmar NF19SK engine parameter. The turbulence model used Large Eddy Simulation (LES) due to accessibility in extensive eddies calculation that has a significant fraction of energy. Thus, combustion analysis accuracy also increased. Base grid of 5mm with adaptive mesh refinement (AMR) and fix embedding is chosen based on simulation time and computer storage. Combustion simulations involve changing of initial temperature, the start of injection (SOI) and injection pressure to obtain pressure and heat release rate data. At intake temperature of 370K, hydrogen combustion shows the highest peak pressure, and for intake temperature at 500K, SOI of 700 °CA produces the highest peak pressure for the combustion. Ignition delay increases as the temperature and injection pressure decrease.
Self-excited oscillation study in grille-cavity flow on floating nuclear power platform
Authors: Li B M , Lin Y S , Huang C H , Gou J L , Zhang K L
Published: October 2019

In order to investigate the self-excited oscillation characteristic of flow past the inlet and outlet of cooling water systems on floating nuclear power platform, a numerical study in grille-cavity flow with suction and drain is carried out. A back pressure condition is set on the side wall of the cavity to simulate the suction and drain conditions. By varying the incoming flow boundary layer thickness and back pressure value, the self-excited oscillation characteristic in grille-cavity flow with suction and drain is studied. As calculations show, the boundary layer thickness has little influence on the oscillation frequency. The strength of self-excited oscillations gradually decreases with the decrease of back pressure, but the frequency does not change much. When the back pressure reduces to a critical value, the self-excited oscillation phenomenon disappears finally.
Power system joint energy and reserve scheduling model considering variable speed pumped hydro storage for mitigating wind curtailment
Authors: Zheng T T , Li Y W , Yang P W , Chen X L , Zheng R , Miao S H , Ji H , Yin H R
Published: October 2019

The large-scale integration of wind power brings great challenges to power system secure and economic operation. In order to address this challenge, the variable speed pump storage hydropower plant (VS-PSHP) technology and demand response technology have addressed a lot attention. In this paper, the coordination of the thermal power generator, the wind power plant, the VS-PSHP and multi-type flexible loads are considered, and a day-ahead and real-time coordinated scheduling model are proposed. The proposed model can formulate the generation, contingency reserve and power distribution factor schedules simultaneously. Numerical simulation results indicate that the coordination of VS-PSHP and multi-type flexible loads can increase the system operation economic and mitigating the wind power curtailment. The results also show that the VS-PSHP is good at providing contingency reserve, and the participation of VS-PSHP can lead to a relatively lower total system operation cost compared to the participation of fixed speed pump storage hydropower plant (FS-PSHP).
Research on the technology of abnormal discharge detection device for metal fittings based on optical fiber signal transmission
Authors: Wang X Y , Sun X D , Chen X L , Wang J F , Chen C F , Dou Y Y
Published: October 2019

This paper aims to develop an abnormal discharge detection device based on optical fiber signal transmission, and realize the reliable detection of abnormal discharge between fittings of high voltage electrical equipment. The detector and visible light detector developed in the arc light detection part can realize the efficient detection of ultraviolet light and visible light in the arc light. By optical fiber far - range signal transmission structure, this design developed multifunctional optical signal collector, which can be converted into analog electric signal, state quantity signal, digital quantity signal and other forms while collecting arc light efficiently.
GAN-Based Augmentation for Improving CNN Performance of Classification of Defective Photovoltaic Module Cells in Electroluminescence Images
Authors: Luo Z , Cheng S Y , Zheng Q Y
Published: October 2019

Electroluminescence (EL) imaging is an effective way for the examining of photovoltaic (PV) modules. Compared with manual analysis, using Convolutional Neural Network (CNN) for classification is much more convenient but it requires a certain amount of annotated training samples which cannot be acquired handily. In this paper, we present a method for augmenting the existing dataset of EL images using Generative Adversarial Networks (GANS) and propose a model called AC-PG GAN aiming at this. Three chosen CNN models are used to examine the effectiveness of the proposed GAN model and have achieved an improvement of the classification accuracy with the augmented dataset after some adjustment and the maximum improvement is up to 14%.
Thermoelectric energy harvesting in aircraft with porous phase change materials
Authors: Madruga S
Published: October 2019

We present a model and simulations of harvesting of thermal fluctuations occurring in the fuselage of an aircraft during a flight and their transformation into electricity using the thermoelectric effect. The model couples a Thermoelectric Generator with a Phase Change Material as a heat reservoir to boost the generation of electricity. We show how introducing a metallic foam within the PCM enhance the production of electric power, and how it occurs through shorter and higher sprouts of voltage generation.
The study of combustion characteristics of corn stalks and cobs via TGA-DTG-DSC analysis
Authors: Wang X D , Xue J J , Zhu Y J , Liu C R , Hu X Y , Liang H , Dong C Q
Published: October 2019

To fully utilize the corn residuals, the combustion characteristics of corn stalks and corn cobs via TG-DTG-DSC (thermogravimetric-differential thermogravimetric-differential scanning calorimetry) were studied. The TGA, DTG and DSC curves are analysed and the combustible characteristics, burnout characteristics, comprehensive combustion characteristics are calculated to estimate the combustion characteristics of corn stalks and corn cobs. The results show the combustible ability of corn cobs is better than that of corn stalks. The ignition temperature of cobs is lower than that of stalks. The combustion rate of cobs is faster than that of stalks. However, the burnout characteristics of stalks are much better than that of cobs. The burnout temperature and time of stalks is higher and longer than that of cobs. The different combustion characteristic of stalks and cobs result from the difference of composition of stalks and cobs. The NIRS spectra also show the spectra of stalks and cobs are significantly different in the range of 1100-1300nm, where is the information of the C-H stretching vibration. In conclusion, it is better to co-combustion of corn stalks and cobs to improve the combustible and burnout characteristics, which will result in easier ignition and more stable combustion. The results of this study will provide guidance to the better utilization of biomass.
Transactions of Real-Time Medical Services Using Smart Card to Support the Role of Smart Campus
Authors: Dewiani  , Palantei Elyas , Azwar Misa Amira , Artini Sitti Wahyuni
Published: October 2019

To improve health service, we can do by using new technology. One example of technology development in health is telemedicine. In this case, the patient data management integrated with electronic checks payments with one card. For that, in this final project is made using smart card system integrated with Unhas Clinic Website. Smart cards that are used by researchers are based on the Consortium Smart Card Indonesia iRFC v 1.0, while the PHP programming language is used to design the website. The creation of MySQL databases and Apache web server responsible for the request-response HTTP are combined in an application called XAMPP. This forms a system that uses a smart card which can save patients’ medical records and perform electronic payment transactions (e-payment). There are 10 people who have been registered as patients on the Website System of Unhas Clinic where 2 of them are insurance patients and have successfully completed the examination. In addition, the examination process at the Website of Unhas Clinic can be done on short distance (0 Km) and long distance (20,3 Km) by using Wireless Fidelity (Wi-fi) network operating system (uplink: 2,94 Mbps; downlink: 20.37 Mbps) and cellular networks such as Provider 1 and Provider 2 (average uplink: 7.1 Mbps; downlink: 5.15 Mbps) with fast connectivity.
An Analysis of the Use of Local Bamboo as an Alternative Energy Source
Authors: Suluh Sallolo , Sampelawang Petrus , Sirande Normalia
Published: October 2019

The use of local bamboo biomass bricket is very effective and eficient to be used as an alternative fuel. This reasearch aimed to (1) evaluate the proximation and calor value of three types of local bamboo based on the variasi jenis bambu, (2) to determine therma efficiency of the bamboo charcoal bricket. This research applied experimental method by using three types of material through efficiency evaluation on the bricket stove. The result of experiment on the comparison of calor value was found that bricket type B1 (Petung Bamboo) has the highest calor value as 5176,333 cal/gram, B2 (Wulung Bamboo) has the value calor as 4873 cal/gram, and B3 (Apus Bamboo) has value of the calor as 5025 cal/gram. Meamwhile, the result of burning experiment on the stove showed that B1 (Petung Bamboo) is the best in terms of the ability to boil water for five (5) times by thermal efficiency l in the amount of 56,91%.
Impacts of Grid Frequency Variation on Dynamic Performance of DFIG Based Wind Turbine
Authors: Shiddiq Yunus A. M.
Published: October 2019

Wind energy is one of popular sources of renewable energy that massively used to generate electric power nowadays. Among wind generator technologies, Doubly Fed Induction Generator (DFIG) is placed as the first dominant wind generator type that is installed worldwide since 2004. Its popularity is due to the advantages of its capability to extract more energy compare to the fixed speed type. Moreover, it uses only one-third converter size which reduced the total construction cost compared to its closest rival, Full Converter Wind Turbine Generator Type. Although DFIG widely installed worldwide, it is in fact, very sensitive to the grid disturbances such as frequency variation. Based on IEEE standard for 60 Hz system, a power system should not be allowed to work in less than 59.3 Hz or more than 60.5 Hz. In this paper, DFIG-grid connected is extensively simulated in the condition of frequency variation that is carried out using Matlab/Simulink. The results show that some important parameters such as power output of the generator, voltage at point of common coupling, voltage at DC link and generator speed are experiencing significant rise/drop which in turn might damage the wind turbine generator.
Thermal performance of shallow spiral-tube ground heat exchanger for ground-source cooling system
Authors: Jalaluddin  , Miyara Akio , Tarakka Rustan , Mochtar Andi Amijoyo , Muhammad Anis IR
Published: October 2019

This study present an investigation of thermal performance of spiral-tube ground heat exchanger (GHE) buried in shallow depth of borehole. The spiral-tube GHE consisting of spiral pipe installed in the borehole provides a better performance in application of ground-source cooling system. Experimental study was carried-out by circulating water through the spiral-tube GHE which is buried in the ground of 3 m depth. Temperatures of inlet and outlet water in the GHE were measured and recorded periodically. The thermal performance of the GHE was calculated with different inlet water temperatures. Heat exchange rate for different inlet water temperature of the spiral-tube GHEs are 44 W/m (35 °C), 126 W/m (40 °C) and 110 W/m (45 °C). The results show that the utilization of shallow borehole of spiral-tube GHE is appropriated for application in ground-source cooling system especially for the hot climate like Indonesia.
Combustion reactivity of low rank coal by the mixture of candlenuts shell
Authors: Patabang Daud , Arif Effendy , Jalaluddin  , Azis Nasruddin
Published: October 2019

Mixture of Low-Rank Coal (LRC) with Candlenuts Shell (CNS) has been carried-out to improve the quality of combustion. The quality of combustion is affected by combustion reactivity, thermal efficiency and combustion emission. This study investigated the effect of the mixture of CNS and LRC to find-out its combustion reactivity. An experimental study has been done to investigate the combustion reactivity of mixing LRC and CNS with the addition of CNS to LRC of 10%, 30%, 50%, 70% and 90% respectively. Testing methods including proximate and ultimate analysis following ASTM Standard and sample combustion in electric furnaces were applied with a combustion temperature of 500 °C, 625°C, 750 °C and 875°C respectively. Oxygen was used as an oxidizer in this experiment. The result of the experimental test shows that the addition of CNS into LRC generally increased its combustion reactivity. This fact indicates that adding CNS into LRC improves significantly the combustion quality of CNS and LRC mixture. The optimum addition of CNS into LRC to increase combustion reactivity is 10%.
The Influence of Topography to the distribution of Ni-laterite deposits of Mangguruh Area, Sebuku Island, South Kalimantan
Authors: Irfan U R , Alimuddin I , Pasalli I B
Published: October 2019

One important factor that influences the optimization of the formation of nickel laterite deposits is the slope of a region's topography. The Mangguruh area in Sebuku Island in South Kalimantan is composed of ultramafic rocks on a gently flat topography but forms laterite deposits of varying thickness. Based on the exploration data from 33 drilling points and field data acquisition, this study aims to: 1) create topographic slope groups with varying ranges to determine the range most suited to real conditions in the field, 2) determine the laterite thickness, 3) analyze the concentration of Ni and Fe in limonite and saprolite layers, 4) analyze the effect of topographic slope to the laterite thickness. The method used is the measurement of topographic slope in the field with compass and using ArcGIS software applications in preparing the maps, analyzing laterite profiles from the drilling data and sampling rocks and ores. The study performed a laboratory analysis consisting of petrographic analysis and X-ray Fluorescence testing of the elements. The result revealed that the appropriate topographic slope groups in the study area were 0-5%, 5-10%, 10-15% and ≥ 15%. The laterite thickness of > 10m lied on the slope of 0-5% and 5-10% and contains a moderate-high nickel content of 1.2% -> 1.4%. This indicates that laterite nickel enrichment is influenced by topography. While the distribution of iron ore with medium and high levels of concentration (45-50% and > 50%) has commonly occurred in each topographic slope group indicating that topography is less influential on the distribution of iron ore. Earlier research has indicated that effect of topography on different morphologies is clear and many of the studies were conducted on a regional scale, but interestingly in Sebuku area, the topography is gently flat but the thickness and nickel content is varied. So the results of this study can be applied to slightly flat slope areas and therefore needs more detailed mapping.
On some examples of BEM solution to elasticity problems of isotropic functionally graded materials
Authors: Hamzah S. , Azis M. I. , Syamsuddin E.
Published: October 2019

A boundary element method is derived for the solution of static elasticity problems of quadratically graded isotropic materials. Some particular problems are considered to illustrate the application of the method.
Evaluation of Finite Control Set - Model Predictive Control for Dynamic Resources Management in A Shared-Resources System
Authors: Aryani D , Wang L , Hidayatullah N A
Published: October 2019

This paper presents an evaluation of Finite Control Set-Model Predictive Control (FCS-MPC) performance for dynamic resources provisioning. Realization of a shared-resources environment is experimented in software system network by virtualization technique. Control parameter regulates the resources provisioning among the users to guarantee the achievement of performance metrics in the network. The objective preferences are maintained in relative term by manipulating a finite set of operating points as the control states. Moreover, an optimization procedure is implemented based on receding horizon prediction of MPC in a feedback control scheme. Further investigation is conducted to examine the performance of optimal FCS and constrained FCS for dynamic system management. The experimental results demonstrate that constrained FCS system provides a better response stability than the optimal FCS. Correspondingly, the range and quantity of input states are significantly influential to the flow of control action. A wider range and longer control state sequence yields to a smoother control signal stream.
A class of variable coefficient elliptic equations solved using BEM
Authors: La Nafie N. , Ilyas N. , Azis M. I. , Amir A. K.
Published: October 2019

In this paper a BEM is used to solve a class of variable coefficient elliptic equations numerically. Some examples are considered to show the convergence, consistency, and accuracy of the numerical solutions.
Application of Hybrid Solar and Wind Energy Generation for Paddle Wheel Aerator
Authors: Mulyadi Musrady , Shiddiq Yunus A. M.
Published: October 2019

At the coastal areas of South Sulawesi, Indonesia, there are many of villagers work as fisherman, shrimps and fish farmers. Most of them use aerator paddle wheel that are operated by high wattage motors that are ranged from 750 Watt to 1000 Watt. Some others use gasoline engine for one aerator every day. Consequently, the use of high wattage motors will cost the farmers and the use of gasoline will contribute to the air pollution. Therefore, it is necessarily important to invent a renewable base energy source for aerator which in turn economically effective that in the same time could apply the energy diversification. Fortunately, solar and wind potency are quite promising in the area. In this paper, an investigation, examination and application of hybrid solar-wind turbine generator are conducted and applied to aerator paddle wheel for shrimp’s pond. The required energy is 420 Wh/day. The measured average wind speed at Pancana Village is ranged from 3.25 m/s to 5.28 m/s. The averaged solar radiation potency in the village is 975 W/m2. The hybrid system is a combination of two 150 Wp solar panels and 500 W wind turbine. The experimental result show that the solar panels could generate energy by about 370.54 Wh in average, while wind energy could generate 165.60 Wh energy every day. Therefore, it can be concluded that the required energy of the aerator at average paddle wheel of 80 rpm can be fulfilled although solar energy is dominant as energy supplier.
Production of carbon dioxide, methane and nitrous oxide gas emissions in biodegradation of waste oil sludge
Authors: Fahruddin
Published: October 2019

Biodegradation Bioremediation of waste oil sludge through biodegradation using microorganisms still has an impact on the environment, because produces of gas emissions which causes to the global warming. The purpose of this study was to determine the production of carbon dioxide, methane, and nitrous oxide gas in biodegradation of waste oil sludge by using types of bioactivator from soil as the microbe inoculums sources was compost, mangrove and forest soil with adjusting the ratio of C:N:P of 360:60:1 to optimize the biodegradation condition. The results show that the addition of bioactivator on the treatment of waste oil sludge can increase the biodegradation process. The results show that the compost bioactivator treatment is 72 percent decrease in oil sludge, the forest soil bioactivator treatment of 58 percent and then the mangrove soil bioactivator of 46 percent. The observation of gas production obtained the highest concentration of carbon dioxide was produced on compost bioactivator treatment of 0.91 ppm on the 25 day, production of methane on compost bioactivator treatment was 0.66 ppm on the 25 day and production of nitrous oxide on the mangrove soil bioactivator treatment of 0.19 ppm on the 30 day; The decrease of hydrocarbon waste oil sludge and increased gas production are also associated with an increase in the population number of hydrocarbon degrading bacteria at all bioactivator treatments.
The Development Mechanism of Microcontroller-Based Water Level and Temperature Control
Authors: Ka’ka S , Tandioga R , Lewi  , Muhammad A K , Rahman A , Taufik A
Published: October 2019

The development of Microcontroller-Based Water Level and Temperature Control is the development of Microcontroller-Based Water Level Control Design. This equipment is a tool that can be used to monitor and control the level and temperature of water. The aim of this research is to make a water level and temperature control device based on microcontroller, and to display the information of water level and temperature on the computer. The research methods used during the implementation process of this research are : literature study, hardware and software design, and data retrieval. The Microcontroller-based Water Level and Temperature Control uses two sensors, namely : ultrasonic sensor to detect water level, then the second sensor is a thermocouple sensor which is used to detect water temperature. This equipment uses a water pump to flow water from one tank to another, and the heater that used to heat water. The device has 2 buttons, where the first button is used to control the water level, and the second button is used to control the level and temperature of the water. Based on the results of the study it can be concluded that this water level and temperature control system works well as expected, where this equipment uses a multi position control system mode that has been programmed in the Arduino software and can display sensor readings in the form graphs using matlab software.
Clitoria ternatea flower as natural dyes for Dye-sensitized solar cells
Authors: Hayat Azwar , Putra A. Erwin E. , Amaliyah Novriany , Pandey Shyam. S.
Published: October 2019

Clitoria ternatea flowers have been investigated as a natural sensitizer in Dye-sensitized solar cell (DSSC). Dried C. ternatea flowers ware immersed in ethanol for 48 hours in dark room to obtain anthocyanin pigments. We compared the photovoltaic performance of the sensitizers with Titanium dioxide (TiO2) only and TiO2 with scattering layers. C. ternatea dyes have higher Power Conversion Efficiency (PCE) when applied in TiO2 with scattering layers compared to standard TiO2 semiconductors. Scattering layer (SL) has increased the light path inside the photo-anode film that doubled the short-circuit current (Jsc) and enhanced the open circuit voltage (Voc) compared to TiO2 based cell without the SL. In conclusion, from the result, higher electron injections can be achieved by light management on photo-anode film with scattering layers as one of strategy to enhance the efficiency for further low cost and environment-friendly solar cell.
Computational Simulation on Facial Expressions Using Finite Element Analysis
Authors: Mochtar Andi Amijoyo , Syam Rafiuddin
Published: October 2019

The purposes of this research are to identify mechanical properties of silicone rubber used as artificial skin and perform computational simulation on facial expressions using Finite Element Analysis (FEA). The tensile test was carried out to find mechanical properties of silicone rubber. Calculations on facial expressions were carried out using the mechanical properties of artificial skin of silicone rubber identified by the tensile test.
Codes Development of Industrial Mechatronic System
Authors: Ulandari Sri Hasnawati , Inayah Irdyah , Firstiawaty Zulfhis Shara , Lewi  , Ka’ka Simon , Syam Rafiuddin
Published: October 2019

Industrial Mechatronic System (IMS) is a system designed focuses on the simulation of industrial production activities. This study aims to re-operate Industrial Mechatronic System and robot arm as a whole system by means of treating and repairing some of the components and develop the universal and partial codes. The system consists of six stations and a robot arm with different functions. Some of the stations and the robot arm cannot be operated properly and cannot move per-station by using the factory default codes. To operate each station required the development of coding using Programmable Logic Controller (PLC) additional reserve to avoid deletion of codes that exist in the main PLC with according to it’s work principle. The results showed that the Industrial Mechatronic System can be used to simulate the production system on a PLC-based industry that can be operated universal and partial.
Numerical solutions to BVPs governed by the anisotropic modified Helmholtz equation for trigonometrically graded media
Authors: La Nafie N. , Azis M. I. , Fahruddin
Published: October 2019

A Boundary Element Method (BEM) is used for obtaining solutions to anisotropic trigonometrically 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.
Numerical solutions to anisotropic BVPs for quadratically graded media governed by a Helmholtz equation
Authors: Hamzah S. , Azis M. I. , Amir A. K.
Published: October 2019

A Boundary Element Method (BEM) is used for obtaining solutions to anisotropic quadratically graded media boundary value problems (BVPs) governed by a 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.
Effect of clearance jet on aerodynamic performance of centrifugal fan
Authors: Zhu G J , Bo X Y , Feng J J , Wu G K
Published: October 2019

The change of the depth of the inlet collector inserted into the impeller will change the gap shape between the collector and the impeller, and then affect the performance of the ventilator. Taking the small centrifugal ventilator as the object, the influence of the depth of the impeller inserted into the collector on the aerodynamic performance of the ventilator is studied in this paper. Firstly, the depth of the collector inserted into the front disk of the impeller is adjusted to 2 mm, 3 mm and 4 mm respectively to change the geometry of the clearance. Then, based on the computational fluid dynamics analysis method, the influence of the insertion depth of the above three different concentrators on the aerodynamic performance of the ventilator is analyzed. The analysis results show that the gap leakage is positively correlated with the depth of the impeller inserted into the collector, and the aerodynamic performance of the ventilator can be significantly improved by reducing the insertion depth of the collector under the conditions of design flow rate and large flow rate, but under the condition of small flow, the decrease of insertion depth weakens the effect of gap jet on the flow field in impeller, resulting in the decrease of fan efficiency and static pressure.
Acoustic response of thin-walled, orthogonally stiffened cylinders
Authors: Zhao D , Ferguson N S , Squicciarini G
Published: October 2019

A semi-analytical model is developed to predict the acoustic response of thin-walled, orthogonally stiffened cylinders. The free vibration model is solved by the approximate assumed-modes method. The excitation of the normal modes is considered in terms of the Joint Acceptance Function (JAF) for incident acoustic harmonic plane waves. The surface pressure distribution is obtained by the shallow shell approximation, where the blocked excitation pressure is double the incident pressure, and by the 2-D rigid cylinder approximation considering the sound scattering. The acoustic response is then compared with that of a fully coupled FE-BE model. An efficient estimation of the response can be obtained by the two models over a certain range of accuracy. Numerical results for different structural configurations are then given. The effect of the stiffeners on the modal characteristics is discussed. It also illustrates the modal contribution to the total displacement response and addresses both circumferential and axial orthogonally stiffened cylinder arrangements.
Refinement construction simulation research of BIM technology on pumping concrete
Authors: Li Y , Song C Y , Wang Z G , Li Z G
Published: October 2019

With the gradual increase of pumping construction of medium and high-rise buildings in China, the construction requirements for concrete pumping process are gradually improved. Based on a project in Wuhan, this paper applied BIM technology on the pumping concrete construction process. Through the use of several softwares, the optimization of pumping pipeline layout, simulation of construction schedule, and priority grouping of marked bends was achieved. The details of the concrete construction of concrete pumping using BIMtechnology were shown, providing a reference for the application of BIM technology in the field of pumping concrete.