bluuebunny/crossref_metadata_2025_split huggingface dataset:
Morphological characteristics of preliminary breakdown pulses of hybrid intra cloud–negative cloud-to-ground lightning at low lattitude
Authors: Emeraldi P , Hamid M I , Hazmi A 
Published: September 2019

AbstractPreliminary breakdown (PB) pulses can represent the propagation path of lightning initiation and can be used to model the charge structure of a thundercloud. The characteristics of PB pulses from the lightning initiation process depend on the charge structure of the lightning cloud. This study presents the PB pulse morphology and charge structure of thunderclouds from hybrid intracloud–negative cloud-to-ground (hybrid IC-NCG) lightning in Padang, Indonesia. PB pulses were obtained from lightning radiation electric field observation. A total of 41 PB pulse waveforms of hybrid IC-NGC flashes were analyzed. Three types of PB pulse characteristics occurred in association with three different types of hybrid IC-NCG lightning morphologies. Hybrid IC-NCG lightning can be initiated from the main negative cloud charge to the upper positive cloud charge or vice-versa. The propagation direction of the initial PB pulse train of hybrid IC-NCG flashes is either upward or downward.
Increasing the quality and power capacity of HERIC PV-Inverter through multilevel topology implementation
Authors: Hamid M I , Ardiansyah D 
Published: September 2019

Abstract
In photovoltaic generation applications, high efficiency and good output power quality inverter are very important. The most common way to improve the quality of the inverter output voltage is to increase the switching frequency. However, at the same time, this method will increase power losses. This paper introduces a new topology inverter: HERIC multilevel, as an inverter that has good voltage quality (low THD) with a low switching frequency. This topology was tested and analyzed by performing simulations to compare it with the conventional HERIC and cascaded H-Bridge inverters. The results prove that the multilevel HERIC inverter has a lower THD compared to the two inverters. At the switching frequency of 2500Hz; Multilevel HERIC inverters have THD, 1.23%, cascaded H-bridge has 1.34% THD, and conventional HERIC THD 11.4%.
Partial discharge signal denoising by using hard threshold and soft threshold methods and wavelet transformation
Authors: Zaeni A , Kasnalestari T , Khayam U 
Published: September 2019

Abstract
The important thing to do after we detect the existence of partial discharges inside an isolation system is signal processing. One form of signal processing that needs to be carried out on the generated waveform is denoising or noise removal from the wave obtained. In this study, an experiment will be conducted to denounce partial discharge waves using Wavelet and Threshold transformations. Wavelet transformation is applied in various levels then we compare the best denomination while denoisation using Threshold is applied using Soft Threshold and Hard Threshold.
Preliminary results on the development of monoester type insulating oil from coconut oil
Authors: Rajab A , Putra F E , Ramadhani J S , Silitonga M S I , Kurniawan R , Qibran K , Latif M , Hamid M I 
Published: September 2019

Abstract
Vegetable oils, both in tri-ester and monoester forms have been attractive alternative substitutes for replacing mineral oil as the insulating liquid used in power transformer. An effort to develop a monoester type insulating oil derived from coconut oil has been conducted, and the preliminary results of the development are reported in this paper. Five different samples were prepared from methyl ester of coconut oil based on their melting point. The important properties of oil samples such as viscosity, water content, acidity, and density were tested, and are evaluated based on the standard specification of natural ester used for the transformer. Another fundamental property, i.e., oxidation stability was also tested and is evaluated by comparing the corresponding result of mineral oil. It is found that oil needs further treatment before being able to be used as insulating oil.
A system for improving suppliers evaluation: the case of procurement in educational institution (Case study: Andalas University)
Authors: Farid M , Hadiguna R A , Kamil I 
Published: September 2019

Abstract
Supplier selection is one of the problems in both profit and non-profit organizations that need to be resolved efficiently. One of non-profit organizations is a college. Colleges aim to produce quality graduates. One factor influencing the quality of graduates is the availability of facilities and infrastructure to support the learning process. To obtain good quality facilities and infrastructure, a procurement process is needed by involving the supplier selection process. One way to get a good supplier is to use a Decision Support System (DSS) to help the supplier selection process efficiently. The design is done by integrating databases, mathematical models and information models that are packaged in a user interface (UI). Database design consists of a database of criteria, assessments, inventory data and supplier work lists. Design a mathematical model combines a Likert scale for determining criteria with the TOPSIS method for supplier ranking and Knowledge Management as additional support for supplier assessment. The results obtained are not only fixated on the supplier sorting process, but also display information on supplier data, job list and management of inventory items as supporting decision making and increase the effectiveness and efficiency of supplier selection processes into real time.
An evaluation on Dr. M. Djamil Hospital Padang parking lot capacity
Authors: Alfadhlani  , Yasrin W S F , Afrinaldi F 
Published: September 2019

Abstract
Parking is an element that cannot be separated from a facility, including hospitals. Dr. M. Djamil General Hospital, one of the health facilities located in Padang, should have an adequate parking space according to the standard designed for parking facilities. This research is conducted to evaluate the condition of the hospital parking facilities, started by calculating the existing capacity of the parking facility for motorcycles and cars. The next step is estimating the demand for parking spaces based on a one-week observation. Finally, the capacity is compared to the demand for parking areas. It was found 319 and 551 parking spaces available for cars and motorcycles. While based on the observation, it is also known that the maximum demands are 453 and 1038 spaces for cars and motorcycles, respectively. Furthermore, the current parking layout condition has not met the standard yet. This study proposes two kinds of improvement. First, additional parking lots are required, and it is designed based on the demand-capacity comparison. Second, the management of the hospital is suggested to regulate the number of vehicles that can park in the hospital parking area. The main contribution of this paper is on the parking lot design alternatives provided to the hospital.
Identification criteria and indicators of palm oil industrial solid waste processing technology
Authors: Ishak A , Ali A Y B 
Published: September 2019

Abstract
The palm oil industry continues to grow from year to year — processing of the palm oil industry into Crude Palm Oil (CPO) and Palm Kernel Oil (PKO). The ratio of the amount of oil produced by both products is 30% of the raw material. This means that 70% is palm oil waste. The amount of palm oil waste will increase in line with the development of the palm oil industry. The amount of waste generated by the palm oil industry if it is not handled properly and effectively will contribute significantly to environmental damage. Industrial activities ranging from raw materials to produce products will disrupt the lives of people around the factory. There are many alternative technologies available to process other industries, but problems that often occur are difficult to implement the most appropriate technology. This paper describes an application of multiple criteria analysis (MCA) in assessing criteria and indicators of palm oil industrial solid and liquid waste. These methods were used in a participatory decision-making environment where a team representing various stakeholders and professionals used their expert opinions and judgments in assessing different criteria and indicators (C&I).
Design of ergonomic grated coconut squeezer
Authors: Dewi D C , Novrianti  , Handayani C , Wulandari O , Nurhayati I 
Published: September 2019

Abstract
The use of machines with manual technology is still a mainstay for small industries, especially home industries. One of them is the activity of squeezing grated coconut that still uses hands repeatedly. Users experience musculoskeletal complaints in the hands, body, and neck. The design of grated coconut squeezer has the aim to create a squeezer that provides comfort and does not cause musculoskeletal complaints. This design uses anthropometric theory to produce the product size according to the user. The anthropometric data used in the form of pulse size and standard Nordic Questionnaire (SNQ) filling questionnaire were carried out directly. Data processing was carried out by the sufficiency test, and data uniformity, percentile calculation, fatigue analysis, and statistical tests. The result of this design is an ergonomic grated coconut squeezer. Based on the statistical test Paired Sample t-Test is known the difference in pulse rate before and after using a grated coconut squeezer that illustrates the results of the device being made.
Chili sauce production planning model considering raw material availability: An application of Mixed Integer Linear Programming Method
Authors: Jonrinaldi  , Adi A H B , Novira R 
Published: September 2019

Abstract
PT Bina Usaha Keluarga Sedep Roso is one of agroindustry located in Padang producing chili and soy sauces. Chili and soy sauces main ingredients are sweet potato and black soybean, respectively. Both chili and soy sauces have a broad market in West Sumatera, Indonesia. The problem often faced by companies is that the demand for chili sauce product cannot be fulfilled because of seasonal and perishable factors of the sweet potato. It became scarce and expensive outside the harvest season otherwise the excessive supply and low price in the harvest season. This paper proposes an application of mixed integer linear programming to manage production planning of chili sauce to minimize total operational cost and increase the service level considering raw material availability and production capacity of chili sauce companies. The mixed integer linear programming method is applied because there are some constraints on the problem. The mathematical model is developed to obtain the optimal solution in allocating the available resources with given constraints regarding raw material availability and production capacity. The numerical example is given to illustrate the model and show results. Sensitivity analysis is performed to see the changes in the optimal solution caused by the changes in the input parameters of the model.
Designing of welding jig for productivity improvement and cost-savings in thresher’s cover assembly: A Case Study on CV Citra Dragon Assembly Plant
Authors: Mulyadi I H , Putri N T , Muhammad F 
Published: September 2019

Abstract
Needs for efficient assembly process has led CV Citra Dragon, a medium-scale manufacturing enterprise of agricultural machinery, to utilize welding jig for assembly one part of thresher component as their high demanding product. That component is thresher’s cover that has the potential for productivity improvement hence cost savings. Due to categorize as a specific work-holding device for particular purpose and conditions, design processes of a welding jig has been carried out. This has resulted in the development of a welding jig for assembly of thresher’s cover. The design of welding jig has been evaluated from possibility to deflect during its operation, and it was identified that deflection magnitude of welding jig construction was relatively low. Thus, it can infer that this welding jig can resist operational loads. Furthermore, the productivity and cost-effectiveness analysis were also conducted to ensure the welding jig having fulfilled the objective of the proposal. The analysis indicated that the assembly process becomes efficient as a welding jig deployed. It was contributed by shortening of assembly cycle times that increase the production rate. Also, affordable cost savings can also be obvious especially for labor cost salary.
Technical characteristics’ determination of crumb rubber product by using quality function deployment (QFD) phase I
Authors: Ginting R , Widodo  
Published: September 2019

Abstract
Products that have the best quality are products that are produced by researching consumer’s need. Product indicators that have the best quality are the linkages between technical characteristics and consumer’s need. PT XYZ is a company engaged in the production of crumb rubber products. However, the products produced are not by the needs of consumers because there are differences between the indicators required and the indicators produced by the company. The purpose of this study is to identify technical characteristics that are by consumer needs. The method that can be used is the Quality Function Deployment (QFD) method. The QFD method is a method that relates the relationship between consumer needs and product characteristics to obtain the products quality. In other words, by using the QFD method, consumer needs can be translated into technical characteristics so that improvements can be made to prioritized technical characteristics. The results obtained from this study are stating that the priority characteristics obtained are the speed of production with a difficulty level is 4, the degree of importance is 21%, and the estimated cost is 18%.
The use of protein binder from shaving waste for leather finishing: Judging from the physical, chemical, and morphological properties of lizard skin leather
Authors: Sutyasmi S , Pahlawan I F , Griyanitasari G 
Published: September 2019

Abstract
Shaving waste is the tanned hides/skins shavings produced by the leather tanning industry. The waste is very polluting the environment because it contains chromium, difficult to degrade, large in volume and light in weight. Therefore it is difficult to handle for the leather tanning industry. The purpose of this study was to deal with the problem of shaving waste which was very polluting the environment and to evaluate the effect of the application of protein binders made from the shaving waste on physical, chemical, and morphological properties of the lizard skin leather. The shaving waste was hydrolysed using NaOH and separated by filtering the results of the hydrolysis. Filter results were tested as protein binder and used for lizard skin leather finishing. The lizard skin leather was then finished with a variation of the protein binder 1:1, 1:3, and 1:5. Then, the leather was tested physically, chemically, and morphologically. The results of the organoleptic test showed that all variations were almost the same and met the requirement of Indonesian Standard on the quality of chrome-tanned snake finished leather (SNI 06-4586-1998). For the physical properties, all parameters met the requirement of SNI, except for elongation. Chemical tests results showed that all of the parameters met the requirement. Morphologically, it showed that the greater the ratio between the protein binder and water, the smoother the morphology of the surface.
Distribution of organic contamination based on depth stratification in Maninjau Lake, Indonesia
Authors: Komala P S , Nur A , Nazhifa I 
Published: September 2019

AbstractThe purpose of this study was to analyze the organic content of Lake Maninjau based on depth stratification and its organics carrying capacity. Sampling was carried out at the location of lake utilization, namely in the lake center, settlement, hydropower, endemic fisheries, and fish cage following Indonesian National Standard SNI 6989.57: 2008. The parameters measured were BOD5, COD and environmental condition such as pH, DO and temperatures. Lake Maninjau generally is polluted, especially for organic pollutants characterized by the BOD5and COD values that did not meet the quality standard of Government regulations the Republic of Indonesia Number 82 the year 2001 class 2 according to its designation namely 21.87-47 mg BOD/L and 35.2-74 mg COD/L. Using one-way analysis of variance (ANOVA) at 0.05% level of significance both BOD5and COD has a strong correlation with depth of the lake, at hydropower and endemic fisheries. At the shallow lake depths, water is easy to mix so that the organic matter distributed vertically. Fish cage has the highest contribution to the contamination of organic matter in the lake.
Study of recycling potential of solid waste of tourist area in Pariaman City
Authors: Aziz R , Mira  
Published: September 2019

Abstract
This study aims to measure and analyze the data of solid waste generation, composition and recycling potential of the tourist area of Pariaman City. Sampling and determination of samples based on SNI 19-3964-1994. Sampling location was on three beaches in Pariaman City were Gandoriah Beach, Cermin Beach, and Kata Beach, and one island namely Angso Duo island. The results showed that the average unit of solid waste generation was 0.033 kg/cap./day or 0.344 liters/cap./day. The largest component of the waste was organic waste by 90.79%, while inorganic waste by 9.21%. Recycling potential consists of non-ferrous metal 95.072%, plastic 93.359%, glass 64.505%, food waste 36.787% and paper waste 19.231%. It was recommended that solid waste could be treated by composting technology to treat the garbage, cleaning and packing the rubbish, and utilizing the waste that has value to produce the creative product for supporting the tourism activity such as souvenirs.
The effect of additional vegetables and fruits waste on the quality of compost of cassava chip industry solid waste on takakura composter
Authors: Dewilda Yommi , Aziz Rizki , Handayani Restu Ayu 
Published: September 2019

Abstract
This study aims to determine the optimum raw material composition on an aerobic composting method using takakura composter. Each variation was tested for maturity and quality of compost then compared with SNI 19-7030-2004 on macro element parameters. This research mixes raw materials, namely solid cassava chips industrial waste in the form of cassava peel and domestic organic waste in the form of vegetable and fruit waste from the homes of residents around the cassava factory and the addition of EM4 bio-activator. The raw materials used are Cassava Peel (CP) and Vegetables Fruits Waste (VFW) and additional EM4 as bio-activator. The composter used has a capacity of 5 kg as many as 7 units with 7 variations, namely variation 1 (100% CP), variation 2 (100% CP; EM4), variation 3 (90% CP; 10% VFW; EM4); variation 4 (80% CP; 20% VFW; EM4), variation 5 (70% CP; 30% VFW; EM4), variation 6 (60% CP; 40% VFW; EM4), and variation 7 (50% CP; 50% VFW; EM4). The results showed that all composters had met the standards following the compost standards used in Indonesia, namely the SNI 19-7030-2004 standard on compost specifications from domestic organic waste. The quantity of compost produced in this study was 1.0-1.5 kg where variation 6 produced the most compost quantity as 1.5 kg. The optimum dosage for composting was assessed from the highest scoring system was variation 6 with a mixture of 60% CP; 40% VFW; EM4 with a score of 24 and composting time for seven days.
Spatial distribution of coliform bacteria in Batang Arau River, Padang, West Sumatera, Indonesia
Authors: Helard D. , Indah S , Wilandari M 
Published: September 2019

Abstract
The objective of this study was to assess spatial distribution of bacterial population in Batang Arau River. The river water was sampled biweekly, during 3 successive months, and analyzed for coliform bacteria (total coliforms, TC, and fecal coliforms, FC). The results showed that the number of TC range 2.61 – 4.89 log10 number/100 mL and FC 2.48 – 4.79 log10 number/100 mL. The concentration of all parameters inspected has increased from upstream to downstream of the river, except for pH and DO. Bacterial coliforms were strongly correlated with some physicochemical parameters (TSS, TDS, EC and pH), with a Spearman correlation coefficient (r) ranged from -0.599 to 0.827. Analysis of the spatial distribution of the one-way ANOVA at 95% confidence level showed that there were significant differences (p<0.05) in the concentration of bacterial coliforms between upstream and downstream sampling stations as a result of differences in land use and human activity. Cluster analysis grouped 8 sampling stations into two clusters, moderate and high polluted, based on similarities of bacterial characteristics. The bacterial data clearly shows that human health is at a very high risk, as WHO guidelines classification for FC or E. coli in water supplies (WHO 1997) or for agriculture use (WHO 2006) and those strategies for improving water quality of Batang Arau River must be expeditiously implemented.
The determination of workspace and the performance evaluation of PRoM-120 with 3 and 4 kinematic constants
Authors: Adriyan  , Sufiyanto  
Published: September 2019

Abstract
This paper presented a parallel robotic manipulator having combined DOF, i.e., one translational and two rotational DOF, called PRoM-120. PRoM-120 is constructed by using 2PRU/PRS kinematic chains (KCs) and arranged in an asymmetric configuration. The objective of the research is to determine the workspace and to evaluate the performance of PRoM-120 for three cases based on the numerical values of its kinematic constants. The workspace is calculated by applying the discretization method. The inverse kinematic solution, direct singularity, inverse singularity, and actuators limit are taken as the significant factor to determine the workspace. Meanwhile, the performance of PRoM-120 is evaluated by applying conditioning index and transmission based index. It shows the conditioning index cannot be used for PRoM-120, or parallel manipulator having combined DOF. Assessing the performance of PRoM-120 using transmission based index exposes only less than 20% of the workspace be in the good transmission workspace.
Thermal characteristics and phase transformation of iron ores containing varied crystalline water with coal mixtures
Authors: Sinuhaji M M F , Harjanto S , Hapid A 
Published: September 2019

Abstract
Iron ore, with high combined water such as goethite, is widely spread in Indonesia. This is not commonly used as the main raw material in iron and steel making pr0Cess. However, as iron ore resources are getting limited and decreasing in number, iron making industries have to seek other iron ore sources, such as low-grade iron ore goethite ore. The purpose of this research is to investigate the thermal characteristics of composite iron ore containing high combined water, coal, and synthetic goethite ore as comparing samples using the thermogravimetric method. This research is conducted with several experimental conditions: heating from 25-1200°C; heating rate 10°C/minute; nitrogen (inert) furnace atmosphere. The composition is divided into two parts, which are composite A and composite B with 24% and 16% coal, respectively. The results showed that wustite and solid iron formations at a temperature of 973°C; 1050°C and 990°C; 1060°C, respectively. This is because there is more coal composition on composite A so that composite B needs a higher temperature to produce CO as reducing agent. In general, for all mixtures, the reactions 0Ccurred from lower temperature are dehydration, dehydroxylation, the formations of Fe2O3 (hematite), Fe3O4 (magnetite), wustite (FeO), and Fe Metal.