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Journal of Vocational Studies on Applied Research
Published by Universitas Diponegoro
ISSN : -     EISSN : 26848090     DOI : -
Core Subject : Engineering,
Engineering
Journal of Vocational Studies on Applied Research [e-ISSN 2684-8090] is an open access peer reviewed journal published by Vocational School Diponegoro University Semarang Central Java Indonesia. Journal of Vocational Studies on Applied Research is an Journal publishing academic and industrial topics which covers area of interest on applied research as well as vocational studies. Research papers on Engineering, Science and Vocational Studies are welcomed. The Journal is double-blind reviewed which accepts Original Research Paper, Short Communication and Review Articles.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 6 Documents
 1 
Search results for , issue "Volume 2, Issue 2, Year 2020 (October 2020)" : 6 Documents clear
The Effect of Lactic Acid Hydrolysis in the Making of Modified Maizena Flour Yusuf Arya Yudanto; Raissa Wahyu Alvina; Isti Pudjihastuti
Journal of Vocational Studies on Applied Research Volume 2, Issue 2, Year 2020 (October 2020)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (359.853 KB) | DOI: 10.14710/jvsar.v2i2.8107

Abstract

Flour is a useful agricultural product for various foodstuffs, one type of flour obtained in Indonesia is wheat flour. The need for this flour makes the import number of Indonesia increase, whereas many other plants have great potential to be used as raw material for making flour, such as tubers, taro, corn, and others. However, the content of amino acids and sugar as an energy source in corn is still relatively low. So we need a breakthrough to improve it and can affect the quality of the final product. This experiment focused on the combination of the lactic acid hydrolysis process in addition to UV light on maize starch so that the modified product is expected to have properties that almost the same with flour. There is a variety of changing variables which is the concentration of lactic acid. The number of the concentration that we use for this research is 0.5% (w/v); 1% (w/v); 1.5% (w/v); and 2% (w/v). The score of water content that we get is decreasing. It happened because the lactic acid can weaken hydrogen bonds which causes starch molecular weight to be lower, the structure becomes tenuous and soft, so that more water is evaporated during the oven drying process. Besides, the length of the hydrolysis process also affects the water content of the flour produced, which is soaking time inversely proportional to the water content produced. This happens because the longer the reaction with lactic acid causes the hydrogen bonds in starch to be weak so that the bonds between water molecules with various other components in the material more easily broken. From the analysis, the best point of the water content and baking expansion is consequently 18.780% and 40%. From 4 concentrations used (0.5%; 1%; 1.5%; and 2%), the lowest concentrations gave the best result, because it got the highest score in the baking expansion. This research result shows that modified starch has a better characteristic than natural starch. The factor that determined the good flour is the rheology characteristic which is the baking expansion.
Effect of Banana Types on Oven Drying Process for Crispy Banana Production Arum Dyah Saputri; Rizka Amalia; Mohamad Endy Yulianto; Vita Paramita
Journal of Vocational Studies on Applied Research Volume 2, Issue 2, Year 2020 (October 2020)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (543.955 KB) | DOI: 10.14710/jvsar.v2i2.9294

Abstract

This study aims to determine the effect of moisture and drying rate on Kepok and milk banana species, on the production process of crispy banana. An electric oven was used to examine the drying process at variable temperatures of 70 ºC, 80 ºC and 100 ºC with slices of 1 mm, 2 mm, 3 mm and 4 mm thickness. The results showed that the lowest moisture content and maximum drying rate obtained in Kepok was at a temperature of 100ºC, namely 69.167% and 0.045 grams/minute respectively. Meanwhile, for milk banana, the lowest moisture and the maximum drying rate was obtained at a temperature of 100 ºC, namely 68.167% and 0.042 grams/minute respectively. Furthermore, the organoleptic test results showed that kepok and milk banana experienced browning at 100 ºC, but did not at 70 ºC and 80 ºC with a thickness of 1mm, 2mm and 3mm. In addition, the pore structure of both bananas expanded, while the structure of the bananas appeared bigger after drying.
Optimization of Oil and Methanol Ratio, Time, and Reaction Temperature of Biodiesel Making from Kemiri Sunan Oil (Trisperma Oil Reuteals) with Two Stage Transesterification Zahra Aumy Pranita; Vita Paramita; Rizka Amalia; Heny Kusumayanti
Journal of Vocational Studies on Applied Research Volume 2, Issue 2, Year 2020 (October 2020)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (622.379 KB) | DOI: 10.14710/jvsar.v2i2.9323

Abstract

Abstract - Biodiesel is an alternative fuel which is generally produced from the transesterification process between vegetable oil and methanol, ethanol, or butanol with the help of a catalyst which aims to speed up the reaction. The raw material for making biodiesel, namely renewable vegetable oil, also sees Indonesia as a tropical country so that biodiesel can be produced on a large scale and is environmentally friendly. Vegetable oil can be classified into two, namely edible oil (food) and non edible oil (non-food). The research was conducted using non-edible vegetable oil, namely kemiri sunan oil, which was carried out using a two-stage transesterification method. This research was conducted to determine the optimization of the ratio of oil and methanol (1: 4; 1: 5; 1: 6), temperature (55⁰C, 60⁰C, 65⁰C) and reaction time (15 minutes, 30 minutes, 45 minutes) in making biodiesel from kemiri sunan oil, where the experimental results obtained the highest yield value of 82.79%. In the experiment, analysis of density, viscosity, moisture content and cetane number was also carried out. The results showed that the viscosity and cetane number obtained did not meet SNI for biodiesel.
Discipline Parameter (A Study on Civil Servant’s Work Discipline in Central Java Provincial Court) Johan Bhimo Sukoco; Fika Ni’matul Ulya
Journal of Vocational Studies on Applied Research Volume 2, Issue 2, Year 2020 (October 2020)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (368.652 KB) | DOI: 10.14710/jvsar.v2i2.7732

Abstract

An organization needs to improve its employees’ work discipline. It is important recalling that the objective of organization will be achieved difficultly without the employees’ work discipline. This research studied the work discipline of Civil Servants in Central Java Provincial Court. This study was analyzed using 5 (five) discipline parameters: compliance with work hour and superior’s instruction, compliance with dressing rule, using office facilities well, and working according to the rule (Enceng and Suryarama, 2013). The research method employed in this study was descriptive one with qualitative approach. Primary and secondary data was used in this study. The methods of collecting data used were interview, observation, and documentation study. This study employed an interactive analysis. The result of research showed that parameters of compliance with work hour and superior’s instruction, and compliance with dressing rule such as wearing institution identity card have not been compatible yet with discipline parameters. Meanwhile, the parameter of using office facilities well has been compatible, but archiving aspect has not fulfilled yet the discipline parameter. Parameter of working according to the rule has been compatible, despite some servants asking for permission to get out the office beyond the time limit.      
Reliability Analysis of Fire Water Line Sutrisno Sutrisno; Didik Ariwibowo; Seno Darmanto; Wiji Mangestiyono; Galih Satria Hendri Saputra
Journal of Vocational Studies on Applied Research Volume 2, Issue 2, Year 2020 (October 2020)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1022.22 KB) | DOI: 10.14710/jvsar.v2i2.7773

Abstract

The purpose of this research is to analyze the reliability of firewater as a water distribution for emergency conditions.  To determine the remaining useful life (RUL) of the firewater line, this research will apply the counting process so that the rate of remaining useful life (RUL) of the firewater line can be known. The data used as the basis for calculation is failure data gained from technical division databases from 2018. The data obtained will be processed using visual inspection and ultrasonic thickness test methods to produce the remaining useful life of the firewater line. From 5 example fire water lines, only 3 needed to replace of firewater line cause less than 10 years. RUL to 9 years at 10” and 12” Train C/D, 2.45 year at 14” Train C/D, 8 years at 10” and 12” Utilities I.   The mathematical modeling will be verified using visual thickness and ultrasonic Test method to ensure Remaining useful life of firewater line at Badak LNG. Visual inspection refer to API 571 and ultrasonic test refer to API 570 and ASME B31.3
Physico-Chemical Properties of Calcium-Fortified Analog Rice from Composite Flour (Cassava, Corn, and Snakehead Fish) for Osteoporosis Prevention Siswo Sumardiono; Isti Pudjihastuti; Edy Supriyo; Rizka Amalia
Journal of Vocational Studies on Applied Research Volume 2, Issue 2, Year 2020 (October 2020)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (365.664 KB) | DOI: 10.14710/jvsar.v2i2.8062

Abstract

In this study, composite flour made from cassava and corn flour were processed for producing analog rice. To meet the calcium needs for the elderly andto optimize the potential of cassava, corn, and snakehead fish, the analog rice will be fortified with calcium from cork fish. The aim of this work are to study the effect of composite flour composition  and the extruxtion temperature on the physico-chemical properties of calcium-fortified analog rice. The parameter process studied were mocaf flour:snakehead fish flour (MF/SFF) mass ratio (100:0; 97:3; 94 6; 91:9; and 88:12) and extrusion temperature ranging from 50oC, 70oC, and  90oC. The physico-chemical properties including bulk density, cooking time, proximate, calcium levels and its organoleptic were analyzed. The results showed that at 91:9 MF/SFF mass ratio  and  the extrusion temperature at 70oC obtain the best effect on the nutrient content of analog rice which contain 14.34% of water, 0.85% of ash, 71.829% of carbohydrate, 11.236% of  protein, 1.12% of fat , 1,113 ppm of calcium, and 2.427% of dietary fibre.

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