bluuebunny/crossref_metadata_2025 huggingface dataset:
Plumbing work competence instrument in the field of civil engineering
Authors: Arthur R , Rouf F A , Rahmayanti H , Maulana A
Published: December 2019

Plumbers determine the quality of water installations, networks, and management so that the position of plumbers becomes important in maintaining the health of the environment and buildings. This research was conducted with the aim of measuring the validity of plumber’s competency instruments. The research method used is descriptive by involving several expert judgments. The results obtained show that the competency plumbers instrument needs to be thoroughly improved both the content, constructs, and criteria, which are adjusted to the development of the labor market and current industry needs.
Modeling the potential accidents at the guarded railroad crossing line Surabaya–Lamongan
Authors: Luthfiyani F P , Suprayitno H
Published: December 2019

Traffic safety at railroad crossings considered poorly understood by the road users. A good safety understanding at railroad crossings is necessary to prevent potential accidents. This condition is possibly achieved if factors causing the accidents are clearly known. This study aims to find out factors with potentially causing accidents in a railroad crossing, especially related to traffic volume, vehicle queue length, past year accidents, and land use around the railroad crossing. Data were collected from the data inventory survey, which was then analyzed using regression analysis. The results found three equations types based on the land use, respectively as: Type 1 (Railroad Crossing-Local Road/Collector) Y = 0,97 + 2,89x1 + 0,042x2; Type 2 (Railroad Crossing-Public Facilities) Y = 0,693 + 4,4x1 + 0,006x2; Type 3 (Railroad Crossing-Approaching Intersection) Y = -0,209 + 3,140x1 + 0,018x2. This study was benefited to design the policy as well as the layout of railroad crossings in order to minimize the potential accidents in the railroad crossing areas.
Development of communication competency for civil engineering students
Authors: Saleh R , Widiasanti I , Hermawan H
Published: December 2019

This study is specifically aimed at: (i) assessing the communication competencies of engineering students; (ii) identifying important communication skills needed for engineering students; and (iii) ensuring the types of effective teaching and learning activities to develop communication skills of engineering students. The implementation of the study refers to this quantitative-descriptive approach presenting a survey which includes the main activities, namely literature study, primary data collection and analyse, conclusions and recommendations formulation. Analysis is carried out based on information obtained from respondents. Furthermore, data processing is done by using descriptive methods that provide simple and understandable data presentation for the reader by describing or giving information about a data or situation or phenomenon. The survey findings indicate the adequacy of communication training from a curriculum that integrates communication in various core civil engineering courses. The results of the study also showed that team work and oral presentations were the most important factors for civil engineering students and for their future career development. They also place the greatest emphasis on teaching and learning activities that aim to prepare them to take part in the industrial world later.
Design of production control board for make to order home industry
Authors: Mauluddin Y , Chandrahadinata D , Hakim B L , Maulana A A
Published: December 2019

This study discusses the design of a production control board in the home industry. The home industry that implements a response strategy to consumers makes to order, and a production system strategy is a flow shop. The design of the production control board is intended as a tool to see when an order starts and finishes, the position of the order when to accept orders, and the production capacity owned. A home industry that is the object of research is the bag home industry. The research methodology is a case study, and the model used is a modification of the Gantt chart. The design results show the production control board can work as a tool in planning and controlling production activities.
Optimization analysis of route determination and trash distribution policy in Garut City
Authors: Taptajani D S , Aulawi H , Mauluddin Y , Cahyadi U
Published: December 2019

This study sought a solution to the problem of garbage collection and finding the optimal garbage distribution route starting from the Temporary Waste Disposal Site (TPS) to the Final Disposal Site (TPA) using available vehicles based on the capacity spread in each polling station. This study proposes an optimization formulation to model VRP; shipping is divided into several locations to determine the minimum distance route. The first stage optimally determines the transient trash collection points that cover all aspects of the city area. The second stage applies the Saving Matrix method, where this method is used to find the distance from each destination by minimizing the length taken in the process of distributing waste from each polling station to the final destination of the landfill. This research contributes to modelling the VRP in current conditions and introducing heuristic methods to solve problems efficiently. This study is significant to do to apply the basis for understanding the possibility of increasing service levels in the distribution process of the municipal waste collection.
Controlling sugar raw material supplies in the bottled beverage industry
Authors: Willyanto W , Sembiring A C , Sanjaya A
Published: December 2019

The right inventory of raw materials will minimize optimal inventory costs. A company that produces bottled beverages in Medan has problems in procuring raw materials, especially sugar, which results in high inventory costs. Therefore, this study will calculate the order of requests using the Economic Order Quantity (EOQ), Period Order Quantity (POQ), and Min-Max. The EOQ method was chosen because it saves storage costs and ordering costs. The data analysis technique in EOQ method is calculating the optimal amount of raw material purchases, the optimal ordering frequency, the message costs, optimal cost savings and total cost of raw material inventory. EOQ method turned out to have a lower total inventory cost compared to the cost of procurement of raw material supplies set by the company, which is Rp. 215.862.536 while the EOQ method is Rp. 210.777.546. From the calculation results, the EOQ method is more efficient, because the company will be able to minimize the total inventory cost of Rp. 5.084.990 or 2,4% lower.
The effect of drilling mud on hole cleaning in oil and gas industry
Authors: Wastu A R R , Hamid A , Samsol S
Published: December 2019

The primary function of drilling mud is to lift the drill cut and to avoid problems in drilling hole. The purpose and objective of this study are to determine the ability to lift cutting in oil drilling wells. The method in the cutting process can use in three ways, first is Cutting Transport Ratio (Ft), Cutting Concentration (Ca), and the last is Cutting Carrying Index. The three methods have a standard that must be considered. Drilling mud affects the penetration rate during drilling activities. In drilling operations, a high penetration rate is always desirable. Mud pump as a tool for flowing mud into the wellbore affects the speed of the fluid flow of the mud in the annulus, the flow pattern in the mud circulation, and the ability to lift the cutting in the well while the mud pump specification determines the significant flow rate to circulated in the drilling process. The value of rheology of mud such as plastic viscosity and yield value of mud density also affect the performance of the slurry to become a medium for lifting drill cut. The three methods have a standard that must be considered. Cutting Transport Ratio (Ft) must have a value of > 90%, for the cutting concentration (Ca) method must have a value <5%, and cutting carrying index (CCI) has a value of 1.
High production improvement using channel fracturing in a tight conglomeratic sandstone reservoir
Authors: Sitaresmi R , Oetomo H K , Kartiyasa F A
Published: December 2019

A novel method of hydraulic fracturing is by pulse pumping proppant into formation. The proppant is mixed with fibrous material, and this material will hold the formation from closing, even though channel if formed in the formation. A well producing from poorly sorting conglomeratic reservoir with secondary porosity and muddy micro-porosity. The well recently only produces intermittently 9 to 20 BOPD on sucker rod pump. Well permeability is 1.78 mD with reservoir pressure of 1188 Psi. The first step is to further evaluate the well, from rock mechanic and stress of formation, which is called Candidate Selective Factor (CSF). And then, a fracturing operation is designed, based on well parameter and surrounding wells. After performing pre-fracturing; consists of breakdown test, step rate test, and minifrac test; the operation is re-designed. The re-design includes special pulsing pumping technique, and the mainfrac operation. In the actual operation, the proppant was pulsing into formation for eleven times. The results of after channel fracturing shows that the productivity index increases 10.3 times. This new hydraulic fracturing method; Channel Fracturing; will also give less possibility of screen out, in addition to its successful result.
The role of module quality, learning methods, and lecturers with student learning outcomes: Model multiple regression SPSS approach
Authors: Sriyanto H , Masrukhin A
Published: December 2019

The improvement of learning modules Quality, learning methods, and lecturers contribute significantly to student learning outcomes. This study aims to identify the most significant factors related to module quality, learning methods, and lecturers to improve student learning outcomes and how much they influence. Our essay used combination methods (Mixed Methods) qualitative and quantitative with cross sectional approach with respondents and resource persons from lecturers and students of Bina Nusantara University 143 people from various study programs. Data analysis used model multiple regression SPSS 16.0. Overall the findings show the effect of learning system innovation and the development of learning modules, learning methods and quality of lecturers on student learning outcomes. We used the same research toolalsoto show that the number of students in one class also has an impact on student learning outcomes
Evaluation and efficient measurement I-Canang digital startup in Bali with questionnaire user experience and lean startup machine validation board
Authors: Ardyanti A A A P , Wibawa I P P S , Putra I G J E
Published: December 2019

Digital startups are more cutting edge for the young entrepreneurs in this year and always growing in numbers (1). This cause is affected change in business patterns in Indonesia, including Bali. This research aims about how to create a digital business with Lean Startup Machines and Questionnaire User Experience method (UEQ). This business originated from the fact that careers women in Bali had difficulty to buy traditional ceremonial equipment. We developed the early stage of software startup model. First of all, we must concept our ideas and manage it before provides clear criteria and then product ideas. Lean startup model is designed to minimize the risk of returns from products made for market needs. One of tools in this method for customer validation is the validation board. From the research obtained from the core assumptions to survey directly prospective customers for the minimum success criteria that are required. This research had 70% of success required which up to 3 times for the pivot. While the results of the Questionnaire User Experience method (UEQ) the opinion of the community about the system that had made get the overall average impression of Attractiveness (1.71), Persicuity (1.35), Efficiensy (2.66), Dependability (0.92), Stimulation (1.28) dan Novelty (0.69).
Determining an algorithm as the researcher’s contribution: An alternative to performance-based research honorarium
Authors: Pambuko Z B , Setiawan A , Rahayu H S E , Rusdjijati R , Setiyo M , Aman M , Praja C B E
Published: December 2019

The research grant is carried out with a quality assurance cycle that involves the research group to produce the research outcomes such as publication, books, or other intellectual property. However, there are problems regarding the distribution of honorariums from the rest of the budget so that they are fair according to the contributions of each researcher. Therefore, the purpose of the study is to establish the algorithm to produce the fairness index of honorarium distribution based on the researchers’ contribution. The index was built on the input, which is a manifestation of research quality assurance cycle and implemented in pseudocode and flowchart. The results show that the simulation of three conditions with different contributions from each researcher was carried out with accurate results and reflected the performance-based research honorarium distribution. Thus, the algorithm can be used by researchers for the fairness of honorarium distribution.
The study on the self-purification based on BOD parameter, Situ Gede Tangerang City, Banten Province
Authors: Purwati H , Fachrul M F , Hendrawan D I
Published: December 2019

Situ Gede is a natural small lake located in Kelapa Indah, Tangerang District, Tangerang City, which has an area of 5.07 hectares. The decreasing in water quality is characterized by the number of pollutants such as BOD (Biochemical Oxygen Demand), which are closely related to human activities such as the disposal by organic waste from domestic activities surrounding. The purpose of this study is to analyse the self-purification of water body in degrading of organic matter. The average of retention time of Situ Gede is 3.05 hours and a mixed concentration is 16.12 mg/l. The calculation results, the degradation rate at Situ Gede is 0.19/day. These results are stated as the composition of BOD in the Situ Gede situation not degraded perfectly. Alternative strategies for water pollution control can conduct by aeration to increase the oxygen for aerobic microorganism’s growth to process the organic matter degradation.
Coppper biosorption using beads biosorbent of mixed culture microalgae
Authors: Wilan T , Hadisoebroto R , Rinanti A
Published: December 2019

Research on the sorption process of copper metal (Cu2+) from artificial electroplating wastes using a biotechnology approach was studied using beads biosorbent of mixed culture microalgae Chlorella vulgaris, Chlorococcum sp., and Scenedesmus obliquus conducted in batch culture to determine the highest efficiency of Cu2+ adsorption as an effort to control Cu2+ pollution from the environment. Biosorbent is made into beads by mixing 0,5 gr (dead biomass)/gr (Na-alginate polymer). The beads biosorbent of these microalgae are contacted with Cu2+in the pH range 4-6 and contact time 0-180 minutes. The highest sorption efficiency of Cu2+ is 92% obtained at pH 4, 120 minutes’ contact time, in temperature of 25 ºC, and with an initial waste concentration of 25 mg/L. The sorption process of this research follows Langmuir Isotherm with R2 value of 0,9991. It is proven that beads biosorbent of mixed culture microalgae can be used as an environmental-friendly solution to control Cu2+pollution in the environment.
Utilization of styrofoam waste as a lost circulation material in drilling mud
Authors: Fadliah F , Manan H , Hamid A , Pratiwi R , Fajarwati K
Published: December 2019

Lost circulation is a major problem that was often found in the well drilling process. This resulted in rock formations to become unstable, cause damage to wells, equipment, and workers. So to overcome this problem, drilling fluid will usually include lost circulation materials that act as connecting agents throughout the openings in rock formations, which physically close the formation of the opening by entering into the hole and prevent more fluid from coming out. The method used is laboratory research to test the rheology properties of sludge that has been treated with the addition of styrofoam (1 to 5 grams) under conditions of temperatures of 83 °F to 243 °F with intervals of temperature increase of 40 °F and testing using the Fann VG Meter. The measurement results are then compared with the standard. This test was carried out to see the effect of mass and temperature on the physical and rheological properties of drilling mud. The result of this research shows plastic viscosity, yield point, and gel strength of mud increases with increasing concentrations of styrofoam, and decreased when the temperature was increased. The combination of mud that best fits with the standard was addition with 1 gram of styrofoam.
Analysis of hydraulic retention time variation on the leachate treatment by using anaerobic fluidized bed reactor
Authors: Tazkiaturrizki T , Rahayu R , Purwaningrum P
Published: December 2019

Sanitary landfill activities produce leachate that contain of high pollutant wastewater of the solid waste. Anaerobic Fluidized Bed Reactor (AFBR) is one of technology that be able to treat wastewater with high pollutants. This study has purpose to analysis the effect of hydraulic retention time (12, 24, 36, and 48 hours) on the leachate treatment using AFBR. The leachate was collected from TPA Rawa Kucing that has characteristics of COD 5200-5500 mg/L and BOD 2000-2500 mg/L. Seeding and acclimatization is the first method to get the biomass of anaerobic sludge without oxygen supply. During the process, nutrient for the biomass was maintained by giving additional nutrient of glucose 33%, sanitary landfill sludge filtrate 5% and 33% of leachate and 28.3% chlorine-free water at the first formula. The second formula is by mix the glucose 20%, sanitary landfill sludge filtrate 6% and 40% of leachate and 28.3% chlorine-free water, and it took 3 months. The results are optimum variations of hydraulic retention time is 48 hours, to remove BOD, COD, and TSS at 78%, 92% and 22% efficiency. The degradation rate of the substrate (k) in anaerobic fluidized bed reactor is 0.727/day for leachate which has load of 5229 mg/L.
Innovation potencies to conserve the environment quality in the young generation
Authors: Yustiani Y M
Published: December 2019

Environmental damage that has occurred in Indonesia has severely disrupted public health. This condition shows that there needs to be a breakthrough in the form of innovations, especially in terms of technology to prevent and control of environmental damage. This study aims to investigate the potential for innovation in the field of environment that was generated by Indonesia’s young generation. The method used in this study was the distribution of questionnaires to 78 respondents randomly and a review of secondary data. The results of the study show that innovations to improve environmental conditions are not solely by making pollution control devices, but also innovations related to the use of environmentally friendly energy, waste recycling, and innovations that can change the behaviour of people as polluter. The results also showed that only 50% of respondents felt the support of the Indonesian Government towards innovation development programs. The biggest obstacle for respondents in realizing innovation is limitation in funding. Therefore, the most needed activity is training on how to develop ideas into innovations and potential funding that can realize these innovations. There are 76% of respondents interested in applying the intellectual property for their innovations in the form of patents or copyrights.
Abundance of green algae in the intertidal zone of Karang Papak Coastal, West Java, Indonesia
Authors: Cahyanto T , Paujiah E , Rinasti I , Suryani Y , Adawiyah A , Ulfa R A
Published: December 2019

Green alge (Chlorophyta) is the one of macroalgae who have much function such as ecologically and economically that living in the intertidal zone. Several genera of Chlorophyta have been used by local society around coastal area of Karang Papak Coastal, West Java as local product, but the research about abundance of Chlorophyta in Karang Papak coastal was not yet understood. This research aims to study of abundance of green algae in the intertidal zone, Karang Papak Coastal, West Java, Indonesia. This study was conducted on November 2018 and collecting data were collected using ransect method and held in every week (following moon phase). The website of algaebase.org and macroalgae identification books was used to green algae identification and then the results was verified by professional researchers from Lembaga Ilmu Pengetahuan Indonesia (LIPI). Data analysis was performed by calculating the total individual of each type green algae. The results showed that green algae were found consist of 15 species and 6 genus. The highest abundance of green alga species is Ulva lactuta and the lowest one is Codium tomentosum. Its can be caused by environmental factors such as nutrition, temperate, seasonal and tides of seawater. This data can be used for complete data about Indonesian macroalgae and as suggestion for management and monitoring of macroalgae by government and local people to maintain the sustainability of Chlorophyta.
Correlation and path coefficient analysis of heat stress tolerance characters in potato
Authors: Supriatna J , Nuraeni A , Fajarfika R , Sahat J P
Published: December 2019

Morphophysiological characters associated with yield in warm climate area can be used to determine heat stress tolerance characters. Correlation and path coefficient analysis were used to ascertain the relationship between morphophysiological characters and yield, and to estimate direct effects as well as indirect effects on them. Nine cultivars were evaluated in Garut, Indonesia which is situated at an altitude of 732 masl with an average air temperature of 28°C at noon and 23°C at night. Randomized complete block design was used in this experiment and it was performed in triplicate. As the result, correlation analysis indicated that plant height, leaf number, leaf area index, stomatal density, dry weight, tuber number, and tuber diameter showed positive relationship with yield, whereas chlorophyll content showed negative relationship with yield. Furthermore, path coefficient analysis indicated that plant height, leaf number, leaf area index, tuber number, and tuber diameter showed positive direct effect on yield. Path coefficient analysis also indicated indirect effects among characters. Plant height had positive indirect effect on yield through leaf number and leaf area index. Leaf number had positive indirect effect on yield through leaf area index, tuber number, and tuber diameter. Tuber number had positive indirect effect on yield through tuber diameter.
Isolation and characterization of endophytic bacteria from mangrove Rhizophora mucronata Lam. and antibacterial activity test against some pathogenic bacteria
Authors: Maulani B I G , Rasmi D A C , Zulkifli L
Published: December 2019

Mangrove plants are widely used traditionally in treating various types of infectious diseases in the people of Lombok Island. This study aims to isolate and characterize endophytic bacteria from the roots, stems, leaves and fruits of mangrove Rhizophora mucronata Lam. which grow in coastal region of Lombok Island (Gili Sulat), and to determine their antibacterial activity against some patogenic bacteria, such as Escherichia coli, Staphylococcus aureus, Bacillus cereus and Pseudomonas aeruginosa. Media used for isolation were NA and TSA. Antibacterial activity tests were carried out with well diffusion methods, and the level of antibacterial activity refers to the category according to Vasanthakumari. Characterization of endophytic bacteria includes their colony morphology, cell morphology, and physiology. Eighteen (18) endophytic bacteria isolates were obtained. Results showed that 12 isolates of endophytic bacteria had moderate (8-12mm) to strong category (Φ > 12mm) of their antibacterial activity against B. cereus and P. aeruginosa. Isolate of NBM2(1) gave the strongest antibacterial activity against B. cereus. It can be concluded that endophytic bacteria isolated from mangrove R. mucronata Lam. is highly potential to be developed as a new antibacterial source, especially against B. cereus pathogenic bacterium.
Performances Holstein Frisien (FH) dairy Cow in different agricultural ecosystem
Authors: Kusmayadi T , Hasan M , Herawati E , Tanuwiria U H
Published: December 2019

This research was about the performance Friesian Holland dairy cow in different agricural ecosystems inIndonesia. The objective of research was to study growth performance, body weight and milk production FH in Indonesia. The method of the research was survey method, with the technique of determining farmers proportionally. Sampling farmers and their livestock by random sampling method. The data was processed using SPSS 22.0 for the simple descriptive analysis and then tested statistically used T-Test. The results it was concluded that growth, body weight, and milk yield of dairy cows were influenced by agroecosystems, in the dry land agroecosystems and located on or adjacent to forests (dryland and tropical forest/AES DL-Forest), productivity of dairy cows was better than irrigated and dry land with wide balanced rice agroecosystems (DL-IRF) and rainfed and dry land agroecosystems (AES DL-Rainfed).
Optimum sustainable population estimation of Rusa timorensis in Pananjung Pangandaran nature reserve and natural park
Authors: Yuliawati A , Listiawati M , Santosa Y , Thohari A M
Published: December 2019

Three main objectives of conservation are protection, preservation and sustainable utilization. Timor deer is one of Indonesian wild animal that has many benefits and high economic value. But the current Timor deer population continues to decrease with population decline rate of 10% in each generation. It caused by harvesting without considering sustainability. Therefore it is necessary to manage the population for Timor deer, so it can be available for sustainable use. Optimum sustainable population is a threshold population size for sustainable harvesting. The purpose of this study is to estimate the optimum sustainable population size so Timor deer can be utilized sustainably in the future. The method used was projecting the actual population by using Leslie matrix (Density Dependence) so that population growth can be seen. The optimum sustainable population is the size of the population with the highest growth rate. The time used for this population projection is 100 years. Based on the results of this research, the optimum sustainable population size for Timor deer in the Pananjung Pangandaran nature reserve and Natural Park is 751 individuals and the optimum sustainable population size will be achieved in 2047.
The life cycle of great Mormon butterfly (Papilio memnon memnon) in captivity
Authors: Komala R , Suryanda A , Wiyati S Y
Published: December 2019

Papilio memnon memnon is one of the butterflies groups of the Papilio clan in West Java, Indonesia. This study aims were to determine the morphology, behavior, and life cycle of the P. m memnon butterfly. The research method used is descriptive with survey techniques and literature studies. This study aims to determine the morphology, behavior, and life cycle of the P. m memnon butterfly. The research method used was descriptive with survey techniques and literature studies. Data about morphology, duration of life, and behavior at each development phase during the P. m memnon butterfly life cycle were analyzed descriptively based on direct observation. The results showed the egg phase of P. m. memnon takes about 7-8 days to the phase instar1 of the larvae. The average total time needed in the larval phase is around 23 - 45 days to the pupa phase. The Pre-pupa phase lasts 1-2 days, while the pupa phase lasts 2-3 weeks. P. m. memnon performs the larval phase as many as 5 stages of instar. Food eaten by first phase instar 1 of larvae is the eggshell, which is useful for insect growth and helps eliminate evidence of eggs from parasitic attacks. At each phase of development, the larvae eat the outer skin to obtain additional energy to support growth.
The ability of garlic extract and Kaempferia galangal inhibit Aspergillus sp. isolated from Sardine fish Pedetan
Authors: Singapurwa N M A S , Candra I P , Rudianta I N
Published: December 2019

Pedetan is one of the food products of the traditional Balinese fish Sardine which is processed by the community in the Jembrana Regency of Bali Province. This study aims to determine the antimicrobial activity of garlic and kaempferia galangal in inhibiting the growth of Aspergillus sp. which can contaminate the sardine fish Pedetan. The study was conducted by isolating Aspergillus sp. from Pedetan and testing the inhibitory power of garlic and Kaempferia galangal. The results showed that the extract of garlic and Kaempferia galangal can inhibit the growth of Aspergillus sp. From the results of SEM observations, it was found that garlic and galangal were able to damage the Mycelia Aspergillus sp. compared to control treatment. Garlic extract and kaempferia galangal can inhibit the growth of Aspergillus sp. because it contains bioactive compounds that are antimicrobial.
Lianas diversity in Gambung area Gunung Tilu Nature Reserve
Authors: Cahyanto T , Yuliawati A , Adawiyah N F , Fajar D
Published: December 2019

Lianas is one of the conspicuous plants in tropical rainforests. One of remaining tropical rainforest in West Java which potentially as lianas habitat is Gunung Tilu Nature Reserve. This research aims are inventory and determine the diversity of lianas in Gambung area which is the most potential area for lianas habitat in Gunung Tilu nature reserve. This research was carried out by a descriptive exploratory method. Sampling was done by combining transect and quadrat technique method, with the length of the transect is 700m which stretched from an altitude of 1489mpl (the lowest altitude at the study site) to 1580mdpl (highest altitude). The results showed that there were 13 families, 15 genera with 24 species of lianas. Tetrastigma sp. is the type of liana with the highest Important Value Index of 29.24%, while Aeschynanthus sp.2 and Cissampelos pareira have the lowest Important Value Index of 0.47%. Lianas Shannon – Wiener diversity index in Gambung area Gunung Tilu nature reserve is 1.092.
Growth pattern and maturity level of Chevron Snakehead’s gonad (Channa Striata)
Authors: Suardika I P , Edi D G S , Arya I W , Darmadi N M
Published: December 2019

Chevron Snakehead (Channa striata) is one kind of freshwater fish that has high nutrient content, particularly albumin. Chevron Snakehead is mostly found in public waters and has not cultivated extensively. This research was aimed to investigate the behaviour, the biological features, the maturity level of gonad, and the growth pattern of Chevron Snakehead. This research was conducted in Tukad Yeh Sungi and irrigation canal of Subak Baru in Baturiti Sub-district, Tabanan Regency in 30 September until 27 October 2017 by using observation, descriptive, and analitical methods. Chevron Snakehead which was found in this research was Channa striata that mostly found in deeper waters with rocky or sandy substrates. This fish is included into nocturnal and carnivora. b. based on the maturity of the gonads of male Chevron Snakehead the testicular weight was 0.1-0.85 gr. Whereas for females it has a gonadal weight of 0.5-1.86 gr. Chevron Snakehead found in rivers have allometric growth patterns, with b values obtained <3 which are b values of females = 2.8696 and b values of males = 2.3335, therefore the growth pattern of Chevron Snakehead was allometric negative. Negative allometric is the dominant increase in on weight gain.
Phenophysiology of the formation and fall of flowers in overcoming efforts fruit-set failure in siam citrus plants
Authors: Sulistiawati N P A , Mahardika I B K , Yuliartini M S
Published: December 2019

Flowers are the critical point of fruit formation. In this study the design used was a randomized block design, taking into account the position of the stem and the season affecting the fall and making flowers. The average value between intervals and Gadu does not show a significant difference with the number of falling flowers, namely: 152.57 florets and 151.44 (florets). The percentage of fruit set at the top, middle and bottom stems produce a difference, 92.75% followed by the middle stem, namely: 92.52%. The average value between intervals and Gadu does not show a significant difference with each percentage of fruit sets formed, namely: 93.30% and 93.07% Percentage formation of fruit sets in the upper stem supported by high leaf chlorophyll content Nutrient content of N, P, and K in the upper stem is 25.82%, 1.40%, 0.74% 3.42% when compared to rootstock, which are: 18.64%, 1.16%, 0.13% and 2.17%.
Implementation of the Static Var Compensator (SVC) in the sub system 150 KV transmission to improvement effort voltage quality in West Java Area
Authors: Hasbullah H , Mulyadi Y , Saputra W S , Muhammad N
Published: December 2019

This study aims to determine the voltage losses on the 150 KV transmission line in Cibatu and Mandirancan Sub-systems in the PLN APB West Java region. This study utilizes the effect of the installation of Static VAR Compensator on voltage losses on a 150 KV transmission line during peak load conditions. By knowing the characteristics of the system on a channel that utilizes sensitivity to the addition of loads, the installation of SVC will have an impact on the improvement of voltage losses on the transmission network. This study uses simulations using ETAP software version 12.6. From the calculation simulation results that use the actual data of APB West Java in the amount of voltage loss on the channel. While based on the ETAP simulation results, there were improvements in voltage losses at Dawuan substation by 13.56%. This proves that SVC installation on transmission lines can reduce voltage losses in the Cibatu and Mandirancan Sub Systems.
The two-levels rectangular microstrip Yagi antenna for Wi-Fi application
Authors: Ismail N , Oktafiani F , Permana D
Published: December 2019

An antenna is the most important part of a wireless communication system. Wi-Fi has an omnidirectional radiation pattern that results in a limited range of emissions. Therefore, it needs an external antenna with a higher gain than the internal antenna. This research designs rectangular Yagi microstrip antenna with two-levels of directors which can work at 2.4 GHz frequency (Wi-Fi Application). The selection of material permittivity value and dimension setting is committed carefully in order to gain > 5 dB. At the time of simulation, optimization is performed by changing the dimension of driven, director, reflector, and distance between levels. The realization of the antenna is committed by using dielectric material with relative permittivity of 4.3. The antenna test results show a bandwidth gain of 7.98 dB, S11 parameter of -16.223 dB with a bidirectional radiation pattern. By selecting the material permittivity value and prudence in managing the antenna dimensions, it is proven to produce an antenna with target gain although the antenna only uses 1 branch and 2-levels of directors.
Complementary of quaternion method and Boole’s rule on IMU sensor to calculate orientation angle of Stewart Platform
Authors: Nurhakim A , Saputra H M , Ismail N
Published: December 2019

This paper discusses the complement of the Quaternion method and Boole’s rules on the IMU sensor aimed to calculate the orientation angle of the Stewart Platform. Orientation angle validity of The Stewart platform is very difficult to recognize by using manual measuring devices. Thus, it requires an IMU sensor to calculate the orientation angle. The IMU sensor consists of three types of sensors, namely the accelerometer, magnetometer, and gyroscope sensors. The Quaternion method is used to calculate the pitch and roll angle of the accelerometer sensor. It is also used to calculate the yaw angle of the magnetometer sensor. Boole’s rule is used to calculate the pitch, roll, and yaw angles of the sensor gyroscope. Moreover, the orientation angle of accelerometer and magnetometer is combined with the orientation angle of the gyroscope using complementary. The test is carried out in six repetitions with angular parameters: 5º, 10º, 15º, 20º, 25º, 30º. Overall, the pitch angle has an average value of error percentage of 2.31%, roll angle has an average value of error percentage of 1.98%, and yaw angle has an average value of error percentage of 1.63%. The measurement results of the orientation angle of the Stewart Platform using the IMU sensor shows that the complementary quaternion and Boole’s rule on the IMU sensor is quite feasible as measuring instruments for the orientation angel of the Stewart Platform.
Diversity technique evaluation for LTE high mobility user based on high altitude platform
Authors: Ridwan A M , Alfian R , Daniil H , Iskandar I , Hamidi E A Z
Published: December 2019

HAPS (High Altitude Platform Station) is an alternative technology of communication system that utilizes terrestrial and satellite systems. HAPS technology is located in the stratosphere layer with the height of 17-22 km above the earth’s surface. HAPS has some advantages, which are wide range area, communication ability on line of sight (LOS), and low propagation delay. In this paper we present the comparison between single HAPS system and two HAPS diversity technique. From simulation result, it is evident that using two HAPS as a diversity technique gives better performance than the single HAPS system, it is shown by how the two HAPS diversity technique requires less SNR than the single HAPS system, typically 3 dB less of SNR.
Heart rate monitoring system based on website
Authors: Hamidi E A Z , Effendi M R , Ramdani F
Published: December 2019

Heart rate monitoring system based on Internet of Things is a device to monitor the heart rates through the website. The prototype designed using a pulse heart sensor that is attached to the finger, the Wi-Fi ESP 8266 module read the sensors and displayed in the LCD and the data obtained can be sent to the website. The data is sent to the databases to find out the record that can be accessed any time using smartphone by opening a web that is already available. So, the users can find when data recorded from the results of testing that has been done. Testing was done by taking 10 samples with a comparison between prototype and oximetry as a control, and the results are not too significant.
The generator operating system automatically uses a motorized change over switch devices
Authors: Muliyati D , Bakri F , Umami I , Sumardani D , Ambarwulan D
Published: December 2019

This system is carried out using two power between the National Electricity Company (PLN) as the main power and the generator as backup power. This system uses 30KVA power capacity for PLN and 45KVA for generator set (genset). This system relies heavily on the crucial role of the motorized change over switch device because the automatic transfer system can run properly without collisions when using the backup power supply and when the main power supplies return. The results provided by the observations on two power experiments between the power of the PLN and the power of the generator when there is a blackout at the PLN. The automatically performance of motorized change over switch works has a range of pauses of 18 seconds to be able to power the genset capable of taking on the role of PLN to back up the Building. Furthermore, when the PLN power returns the power is held for 30 seconds by a motorized change the over switch. It ensures that the main power of the PLN reconnected.
The effect of temperature on energy transfer capacity by laser
Authors: Rahardjo I A , Wadjdi F
Published: December 2019

This study aims to obtain an overview of the effect of temperature on energy transfer capacity by laser which can later be used as one of the basic considerations for transferring electrical energy through air that is converted into the form of light until it is received by the receiver by comparing the transmitted power and power received. The research method uses an experimental method with the design of a laser and a photovoltaic cell as a receiver. The schematic experiment starts with setting up equipment. It is then treated with temperature changes as an effect on the laser. The results of the treatment were analysed so that conclusions were obtained. Based on the results of the study, it was found that the significance level of probability value’s calculation or the significance coefficient was 8.26E-30 which means it is smaller than the specified error rate / alpha (α) of 0.05. And if the coefficient F is uses, the value of the calculated coefficient F is 459.3736 which means it is greater than the F table 4.001191. In accordance with the provisions that apply in testing the hypothesis, it can be concluded that the null hypothesis (H_o) which states “No effect of temperature on output power” is rejected. This means that the evidence of results accepts the alternative hypothesis (H_1) which states “There is an influence of temperature on the output power”. The correlation of the effect of changes in temperature to output power gives the equation y=3E-10xˆ3-3E-08xˆ2+6E-07x+5E-05. So it can be concluded that temperature changes have an effect on output power.
Simple smart glasses based on microcontrollers as money detector of nominal and authenticity
Authors: Muhammad M , Yusro M , Yuliatmojo P
Published: December 2019

This study aims to make a detector for the nominal value and authenticity of money (rupiah currency). The working principle of this tool is as follows: UV LED function to provide lighting to objects (money). The light will circulate hidden colours in original money so that you can differentiate original or fake money (money whose authenticity is doubtful). The white LED provides lighting for the object, then the light is received by the TCS3200-DB colour sensor to read its Red, Green and Blue (RGB). Furthermore, the RGB value will be processed by Arduino Mega 2560 to be compared with the RGB values in the program. The mini DF-Player functions to play sound according to the sound that has been recorded with the program. Testing the system is done to determine the percentage of success of the system in distinguishing between original money and the authenticity of money is doubtful. Testing of 5 (five) nominal 2016 emission rupiah, namely 2,000-rupiah (60%), 10,000-rupiah (100%), 20,000-rupiah (80%), 50,000-rupiah (100%) and 100,000-rupiah (66%), so the average percentage of success of the tool is 81.2%.
Development of smart and safe-bags for children based on microcontroller
Authors: Baihaqi A , Djatmiko W , Yusro M
Published: December 2019

This study aims to develop smart and safe bag that children use to go to school. This bag can provide information about the bag’s weight and the location of the user via text messages (SMS). The bag is designed using several main electronic devices, namely the microcontroller (Arduino Mega2560 board), the buck adjustable IC LM2956 module, the 5 Kg load cell sensor, the Neo 6M-V2 GPS module and the 800L-SIM module. From the test results, this bag system can measure the bag weight of up to 5 Kg with measurement accuracy reaching around 0.3 Kg; can read the user’s position with the accuracy of the GPS position reading reaching around 25 meters, and can provide bag weight information and user’s position through SMS communication. This bag is also capable of working for around 8 hours using a rechargeable Li-Po-3S 1400mAH battery.
Depth control design and simulation of hybrid underwater glider
Authors: Latifah A , Fatimah D D S , Hakim B L , Chandrahadinata D
Published: December 2019

The hybrid underwater glider is a class from the autonomous underwater vehicle (AUV) that the concept of a buoyancy-engine to drive the vehicle sinking or to float are integrated and propeller propulsion systems for variable motion. This kind of vehicle has multi-functionality that enables to maneuver with glider and AUV mode so that it is an effective tool for oceanographic research. To represent the vehicle dynamic, the mathematical model base on the Newton–Euler approach is designed as a nonlinear equation that derives from forces and moment that acting from the vehicle design. For glider motion, buoyancy-engine and moving mass are coupled for working as an input controller actuator, and there is controlling need to make the vehicle go to mission point in some depth for a mission. In this paper, the depth controller will be designed to make the vehicle stay on depth condition. PID controller is used for controller design, that the mathematical model is derived to linear model. Simulation on MATLAB/Simulink is used to design the model and get dynamic vehicle response. With vehicle characteristic for glider motion, desired waypoint obtained with PD control for moving mass in x-axes and P controller for buoyancy engine.
The automatic battery charger based on floating technique
Authors: Mulyana E , Atmoko T D , Kamelia L
Published: December 2019

An automated system will simplify all the work done by humans. One of the automatic systems that has been used is the battery charger system that can be cut by itself. This paper discussed the implementation of automatic systems for battery chargers based on floating techniques. The system will automatically fill and repair the battery from several causes of damage such as overcharging the battery. This charger functions with the switch system turning on and off. The circuit works by comparing the input that goes into the IC, and makes the control input as the main standard of 1.10 V which is attached on a positive foot (pin3) on the IC. The main control system consists of Transistor BC547, IC LM358 and Transistor 2N2907A. This system also uses two transformers, each of which is used to support control and power supply. For the control section using 1A transformer and for power supply using 2A. This system will automatically switch on when the load level is below 12.27 V.
Double layer parasitic radiator for S-Band antennas to increase gain and bandwidth performances
Authors: Sandi E , Diamah A , Iqbal M W , Fajriah D N
Published: December 2019

In this paper, a parasitic radiator combination was developed to improve the gain performance and bandwidth of the S-Band frequency microstrip antenna. Previous studies focused on adding one side layer of the parasitic radiator and the same structure, so the idea emerged to develop a microstrip antenna by adding parasitic radiators from the two sides of the antenna radiator layer and the different structure of the parasitic structure. In this paper, the design of the parasitic radiator is added by combining the circular parasitic radiator patch on the upper layer of the antenna radiator and the square parasitic radiator patch on the bottom layer of the antenna radiator. This study uses a research and development approach through the calculation of parasitic radiator structure and setting the distance between layers. Next is the simulation design and fabrication of antenna samples to verify the test results. Simulation and measurement results show that by adding a parasitic combination of radiators with a distance of 0.36 λ_g at the top layer and 0.15 λ_g at the bottom layer of the antenna, a better gain and bandwidth performance improvement as compared to the addition of parasitic radiator designs in previous studies. This result confirms that the idea of adding a double layer parasitic radiator can be used to improve the performance of a microstrip antenna.