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Logic : Jurnal Rancang Bangun dan Teknologi

LOGIC
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Published by Politeknik Negeri Bali

ISSN : 1412114X EISSN : 25805649 DOI : -

Core Subject : Science, Education,

Computer Science & IT Education

Logic : Jurnal Rancang Bangun dan Teknologi is a peer-reviewed research journal aiming at promoting and publishing original high quality research in all disciplines of engineering and applied technology. All research articles submitted to Logic should be original in nature, never previously published in any journal or presented in a conference or undergoing such process across the world. All the submissions will be peer-reviewed by the panel of experts associated with particular field. Submitted papers should meet the internationally accepted criteria and manuscripts should follow the style of the journal for the purpose of both reviewing and editing.

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Articles 265 Documents

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Design of Mathematics Learning Video For Class XI Students of SMA Saraswati I Denpasar Ni Luh Putu Labasariyani; Ni Luh Putu Mery Marlinda
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 3 (2018): November
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

In accordance with the assessment of KI-3 and KI-4 in the subject of mathematics still have constraints on understanding the concept of student learning so that influence on the learning result. With the existence of these constraints, in this study the researchers combined a scientific approach with video learning. The design used in this study used experimental design of True experimental design that is Posttest Only Control Design. The material given during the course of research action includes the Function Limit, Derivative, and Integral materials. Through the research steps that have been implemented, the final test results are obtained in the experimental class 45% of students belonging to the category that the ability of understanding the concept is very good, and 2.5% of students included in the category of ability to understand the concept is still lacking in the material Limit Function. Then in the Derived material the percentage in very good category is 50% and the enough category is 5%. In Integral material, 50% of students are in very good category and 50% are included in either category. Keywords: Learning Video, Scientific Approach, Experimental Method, Function Limit, Derivative, Integral.

Redesign of Clove Dryer Simulation Machine Using Heat Waste of Radiator as the Heat Source I Kadek Ervan Hadi Wiryanta
Logic : Jurnal Rancang Bangun dan Teknologi Vol 19 No 1 (2019): March
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

In this study, a redesign to a clove dryer simulation tool using exhaust heat from radiator as a source of heat energy has been done. The dryer simulation tool consists of reservoir tank, a heater, a pump to circulate the water in the system, a radiator as a heat exchanger and a drying chamber with 2 shelves. The redesign stage is carried out by fixing the piping insulation system, changing the pipe and adding valve controls to vary the velocity of the fluid flow. Variations made are variations in the mass flow rate of 0.09 kg / s and 0.18 kg /s with a constant air flow rate of 1 m/s. The results of the analysis show that at a higher mass flow rate of 0.18 kg/s the average rate of heat transfer from the radiator air side is higher, which is around 3971.65 watts. The effectiveness of the radiator will also be higher at a higher mass flow rate, the average is 0.34 at a mass flow rate of 0.09 kg/s and 0.43 at a mass flow rate of 0.18 kg /s. For drying rates with a load of 2 kg of cloves with a higher flow rate of liquid will be faster, which is about 5 hours with a flow rate of 0.18 kg/s and 6.5 hours at a flow rate of 0.09 kg/s

Analysis of The Implementation of Occupational Health and Safety Management System on Workers Productivity on Structural Finishing Works of Reinforced Concrete Columns I Made Anom Santiana; I Gede Sastra Wibawa; I Made Tapayasa; I Wayan Suasira; I Ketut Sutapa
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 3 (2018): November
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

The implementation of the project from year to year is significantly improved on implementation aspects of cost, quality, and time, in order to manage the use of human resources to be realistic. Occupational health and safety in a company is often ignored especially for companies which are doing project developments. This also affects the occupational safety of the workers and occupational illness arisen after the projects have been implemented. So in running safe business, occupational health and safety management Systemshould be implemented consistently. The research was conducted in the project of Dialog Villa Petitenget, Cendrawasihstreet, Denpasar, with 15 workers as sample. The implementation of occupational health and safety management systemcan ease the workload of the workers of the structural finishing works of reinforced concrete columns. This is proved by analysis on the treatment group ((p-value< 0.05). This shows that the workloads felt by group P1 (group which implement occupational health and safety management System are lighter than the ones felt by group P0 (group which do not implement the system). The decrease in workload felt by group P1 is 4%. The implementation of occupational health and safety management system can increase work productivity on the construction project of reinforced concrete structure columns. This is proven by the productivity analysis result which shows that the productivity increase experienced by group P1 is 25% with significance level (p-value<0.05). Thus, the implementation of occupational health and safety management system on the structural finishing works of reinforced concrete columns is proven to be able to improve work productivity

Ergo-Physiology Decreases Work Postur Risk and LBP in Red Land Workers in Bosen Village, North Mollo Sub-District, South Central Timor District Jacob M Ratu
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 3 (2018): November
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

The work of digging red earth is one of the physical activities of lifting and carrying. The field conditions of work, the slope level of the land wall and work aids used are one of the reasons why workers work with a bent and twisted posture. Such an posture increases the risk of Low Back Pain (LBP). LBP can reduce work capacity and productivity and in the long time reduce the quality of health and life of workers. For this reason, ergo-physiological intervention is carried out with the aim of reducing the level of risk of work posture and LBP. This research is an experimental study using the same subject design involving 30 red earth digg workers in Bosen Village as the subject of the research. Ergo-physiological interventions are given in the form of improving work posture and physiotherapy training. Improvement of work posture is focused on activities, digging move, and carrying excavated material and lifting excavated material onto transport trucks. Physiotherapy training uses a modified William flexion exercise method. Measuring the level of risk of the work posture using the REBA method and the LBP level using the modified LBP Oswestry questionnaire, carried out before and after the intervention. Differences in data before and after the intervention were tested using different tests of paired t test for normal distributed data and Wilcoxon Sign Rank test for data that were not normally distributed, each using a significance level of 5%. The results showed a decrease in the risk level of work posture and LBP of red earth digger workers is of 3.37 (34.56%) and 1.24 (32.29%) respectively. It was concluded that ergo-physiological interventions effectively reduce the risk of work posture and the level of LBP of red earth digger workers.

PENGARUH PENERAPAN ERGONOMI PADA FASILITAS KERJA TERHADAP PRODUKTIVITAS PEKERJA PEMBUNGKUS DODOL DI DESA PENGLATAN KABUPATEN BULELENG I Gede Santosa
Logic : Jurnal Rancang Bangun dan Teknologi Vol 16 No 1 (2016): March
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (160.704 KB)

Suatu proses industri merupakan suatu sistem kerja yang saling mendukung satu sama lain dari tiap-tiap bagian yang ada di dalamnya. Sistem kerja yang tidak ergonomois dalam suatu perusahaan seperti cara, sikap dan posisi kerja akan berpengaruh terhadap produktivitas, efesiensi, dan efektivitas pekerja dalam menyelesaikan pekerjaannya. Pada bagian pembungkusan dodol di Desa Penglatan Buleleng menunjukkan bahwa terdapat ketidaksesuaian antara fasilitas kerja yang digunakan oleh pekerja pada bagian pembungkusan dodol, tidak sesuai dengan antropometri tubuh pekerja yang menyebabkan keluhan sakit pada pekerja hal ini ditunjukkan dalam hasil kuesioner peta tubuh yang dilakukan setelah selesai bekerja 100% pekerja merasakan keluhan sangat sakit pada bahu, leher, punggung, pinggang, bokong, pantat, lutut, betis, kaki, dan lengan. 100% tidak merasakan sakit pada siku dan tangan. Kesemua rasa sakit yang dirasakan pekerja ini, disebabkan bekerja dengan posisi duduk bersila di lantai dan menunduk dalam waktu yang lama. Oleh karena itu dilakukan perancangan dan penerapan fasilitas kerja yang sesuai dengan antropometri pekerja berupa meja dan kursi kerja. Perancangan tersebut diambil dari pengukuran antropometri pekerja, data antropometri pekerja yang diambil untuk perancangan fasilitas kerja adalah 50-th persentil. Setelah dilakukan penerapan fasilitas kerja yang ergonomis terjadi pengurangan keluhan pada pekerja setelah selesai bekerja 70%, pekerja merasakan keluhan agak sakit dan 30% nya merasakan sakit pada leher, bahu, lengan, punggung, pinggang, bokong, pantat. 80% pekerja merasakan keluhan agak sakit dan 20% sakit pada lengan, pergelangan tangan, paha, pantat, lutut, betis dan kaki. Produktifitas pekerja pada bagian pembungkusan juga terjadi peningkatan antara 15% sampai dengan 22%.

Utilization of Fly And Rice Husk Ashes Waste in The Making of Lightweight Brick in Supporting Construction Materials in Banyuwangi M. Shofi’ul Amin; Mirza Ghulam R.; Galang S; Rysmayang .
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 3 (2018): November
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

The high specific gravity of concrete, which ranges around 2400 kg/m³, will affect the loading of relatively large and heavy structures. This will affect the total weight of the building which can lead to wasteful dimension of foundations which tend to affect the structural behavior in high earthquake areas; the more the weight of the structure, the greater the effect of the earthquake for the building. One alternative material to reduce the weight of the building is lightweight building materials, such as light brick. This study aims to determine the characteristic properties of mortar which is the lightweight brick base material by using the proportion of fly ash and rice husk ash as a substitute for heavy cement with the addition of aluminium powder and when the duration of steam curing is 6 hours at 60oC. The results of the maximum mortar compressive strength occur in a mixture of PC90%: Psr100%: FA10%: AP0%, which is equal to 13.5 MPa. As for the mortar with added ingredients in the form of aluminium powder, the maximum compressive strength of the mixture of PC90%: Psr100%: FA10%: AP0.2%, which is equal to 5.1 MPa. The correlation between specific gravity and compressive strength of mortar can be seen from the low value of specific gravity and high value of compressive strength on the mortar occurring in a mixture of PC90%: Psr100%: PS10%: AP0% with a value of 1.6 kg / cm2 and 5.1 MPa.

Waste Processing With Plant Media is a Path to Sustainable Tourism in Nusa Lembongan Tourism Area I Ketut Suja
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 3 (2018): November
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

his research was conducted in Nusa Lembongan Island, Bali, with the aim to know the waste management model which using model of pond with plant media, in accordance with Government Regulation No. 82 Year 2001 on the management of water quality and air pollution control. In maintaining the environment (green tourism) since 2000, Bali has developed Tri Hita Karana Award and Accreditation Program (THK Awards Program) to hotels in Bali. Water recycling process is one of the conditions that must be possessed by hotel industry with environmental vision. The tourism industry in Bali has a positive impact on economic growth but is suspected as a polluter of the environment. Tourism industry activities cannot be separated from the need to water. Disposable waste discharges cannot cause contamination of the environment itself. Result of physical, chemical and biological quality parameter analysis either in situ (in location) or laboratory. Quantitatively, the manmade pond has potential to become an alternative water resource and needs some process. One method of pond treatment in Indonesia are constructed wetlands due to the diversity of vegetation, the simple construction, flexible, easy and inexpensive operation and maintenance and has aesthetic value. The pollutant reducing vegetation in the pond at this research is jasmine because it is easy to grow, doesn’t need special maintenance, and from some studies it was proofed to be effective in reducing BOD and COD at average of 73%.

The Effect of Baffle Spiral on The Performance of Heat Exchanger Adi Pratama Putra; Ikhwanul Qiram
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 3 (2018): November
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

The application of heat exchanger still causes many problems. Research on the performance improvement of the heat exchanger is also conducted by adding baffle. This research is aimed at finding out the influence of spiral baffle on the performance of heat exchanger. Research is conducted by doing experiment. The heat exchanger used is the opposite flow type. The independent variable includes round and triangular springs with gap spacing of 1, 2 and 3 cm which are installed in the heat pipe. The flow rate of the water is varied by 100, 150, 200 and 250 ml / sec. The dependent variable includes the temperature of hot water (in and out) and the temperature of cold water (in and out). Temperature measurement is done by using a K type thermocouple every minute for 5 minutes. Discharge measurement is done by using flow meter and stopwatch. The results showed that there were effects of the spiral and water discharge variation on the rate of heat transfer. The phenomenon of water discharge is inversely proportional to the rate of temperature change. Maximum heat temperature displacement occurred at a variation of 1.5 cm with a flow rate of 31.25 was 1.44o. The minimum heat transfer temperature occurred at a variation of 0.5 cm with a flow rate of 38.46 was 0.82o. The maximum cold temperature heat transfer occurred at a variation of 1.5 cm with a flow rate of 31.25 was 0.52o and the minimum occurred at variation of 0.5 cm with a flow discharge of 38.46 was 0.14o.

Analysis of St. 42 Steel Hardness After Being Heated to 8000c And Quickly Cooled With Fresh Water by Applying Rockwell Method Ketut Rimpung
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 3 (2018): November
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

The hardness of machine components which, in operation time, collide and rub against each other and are made of St.42 steel needs to be found out. Therefore, research on the hardness of St.42 steel especially those which are heated needs to be carried out so that it can be chosen as machine component properly. This research tests the change of the surface hardness by applying Rockwell method and is the continuation from a former research. Steel is a technical material which is often used as machine components, so that its strength against external loads is really needed to be known. External loads which are often occurred on machine components are friction load, torsion load, tensile load, bent load and mash load. This research aims to find out how much the change of the hardness of standard St.42 steel surface after being heated at temperature of 8000C and quickly cooled by using fresh water which is carried out in laboratory of material testing, Department of Mechanical Engineering, State Polytechnic of Bali. The result shows that the hardness of the surface of steel which is heated until 8000C and quickly cooled by using fresh water is more lenient than the standard St.42 steel, although it is tested by applying either Rockwell B (HRB) or Rockwell C (HRC) methods. The change of the strength based on Rockwell B method shows the decrease in surface hardness until 19,81%; from 29,93 (Kgf/mm2) to 24,0 (Kgf/mm2). In Rockwell C method there is also decrease in surface hardness which is equal to 20,23%; from 54,7(Kgf/mm2) to 43,63 (Kgf/mm2).

Risk Analysis of Project Scheduling Using Microsoft Excel I Nyoman Suardika; Kadek Adi Suryawan; I Ketut Sutapa; I Komang Sudiarta; I Made Suardana Kader
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 3 (2018): November
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

Scheduling plays a very important role for the successful implementation of construction projects. One of the biggest risks in scheduling is in terms of project costs and duration uncertainty. To anticipate these uncertainties, scheduling methods have been developed using probabilistic duration, including PERT and Monte Carlo Simulation methods. In this research the simulation process was carried out using Microsoft Excel which was integrated with @Risk's add-ins. From the results of the analysis, the project duration obtained from the scheduling model with the CPM method, conventional PERT and Monte Carlo simulation produces an average value that is close to the same. The difference occurs in the standard deviation value, the conventional PERT method produces the smallest standard deviation, followed by a Monte Carlo simulation using the PERT distribution and the last is Monte Carlo simulation using the TRIANGULAR distribution. From the results of the sensitivity analysis, it was found that the dominant input variables that affect the duration of the project are the duration of activities that most often enter the critical path or those that have a great critical index. Meanwhile, project costs are influenced by a combination of the duration of activities on the critical path and activities that have a great direct cost.

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