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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 75 Documents
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Optimization of Lemongrass Oil (Cymbopogon citratus) Emulsion with the Addition of Cethyl Alcohol as a Natural Cosurfactant Pradasari, Aprilina Siska; Paramita, Vita
Journal of Vocational Studies on Applied Research Volume 5, Issue 2, Year 2023 (October 2023)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i2.19642

Abstract

Lemongrass oil (Cymbopogon citratus) is a plant that produces essential oils as a raw material for fragrance in cosmetics and perfumes. This study aims to determine the optimum conditions for the preparation of Lemongrass oil-wall emulsion (Tween 80 and Cethyl Alcohol) and to determine the effect of the independent variable in the form of the ratio of lemongrass oil-wall to the viscosity produced using the Response Surface Methodology (RSM). The novelty in this research is lemongrass oil with the addition of Tween 80 and Cethyl Alcohol as natural cosurfactants. Tests were carried out with three independent variables, namely stirring time (15, 20 and 25 minutes), stirring speed (20,000, 22,000 and 24,000 rpm) and lemongrass oil-wall ratio (1:3, 1:4, 1:5), which will be designed with the RSM method to obtain optimum operating conditions. Based on the results obtained, the optimal formula for lemongrass oil emulsion is on the 14th running result, which has a pH value of 6.4; density of 0.852; viscosity of 15,450 cP, type M/A, homogeneous and good stability without any change in colour, aroma, and texture. The influence of the lemongrass oil-wall ratio variable, namely the ratio variable, obtained a P-value of 0.000005, which means it is smaller than the value of α = 0.05 so that it can be said that the ratio has a significant effect on the viscosity of the emulsion.
Extraction of Rose Hybrid Tea Oil with Microwave Assisted Integration of Mahd as a Diffuser Berkah, Fitroh Bawa; Devanda, Ilyas Rabbani; Wibisono, Enggar Sulistyo; Paramita, Vita
Journal of Vocational Studies on Applied Research Volume 6, Issue 1, Year 2024 (April 2024)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v6i1.23714

Abstract

Rose flower have rich compound of oils that are used in many things for example in parfuem industries. Rose flower contains rich of oils fragrance such as eugenol, citronellol, geraniol, nerol, and linalool. This compounds has been used in variety of parfuem and many application has been used such as air freshener, softener, and diffusier. The objective of this research was to find out how to separate essential oils from rose flowers with Microwave Assisted Hydro Distilation and test them as diffusers and to find out the characteristics of essential oil. The extraction process takes place with two variables independent for time and power of extraction with their respective combinations of power: time (watt:minutes) namely; (300/15, 300/25, 300/35, 400/15, 400/25, 400/35, 500/15, 500/25, 500/35). The sample was prepared by make a solution with ratio of solvent (water distillation) and rose petals repeatedly 3:1 (v/m). During the research, an analysis of the yield of extract rose was carried out with a best result of 0.012% and the density produced 1,096 gr/ml. Organoleptic test was obtained with colored white limestone and typical odor of essential oil of rose flowers
Development of Chitosan/Glutaraldehyde Cross-Linked Film with Silica Addition as Membrane Material for SLS Rejection in Detergent Wastewater Illiana, Fivi Fatwa; Ariyanto, Hermawan Dwi
Journal of Vocational Studies on Applied Research Volume 6, Issue 1, Year 2024 (April 2024)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v6i1.22145

Abstract

The pollution resulting from domestic waste has increased with the growing population density, and one of the potential contributors to groundwater contamination is detergent waste. Sodium Lauryl Sulphate (SLS) serves as a common active ingredient in detergent formulations. By leveraging membrane technology, SLS can be processed to reduce its concentration in water to environmentally safe levels. Chitosan, a promising material for membrane composition, is considered as the base material. Exploiting the hydrophilic characteristics of chitosan, silica is introduced to enhance membrane selectivity by reducing pore size through cross-linking between chitosan and silica molecules. The performance of the silica-modified membrane is then evaluated through tests measuring the rejection coefficient against SLS, membrane swelling degree, morphological profiling of functional groups using FTIR, and tensile strength measured with a Universal Testing Machine. Subsequently, the membrane's efficiency in rejecting SLS in detergent waste is assessed based on rejection coefficients using an SLS solution model.
Feasibility Study and Heat Transfer Analysis of Testbed Shell and Tube Heat Exchanger at Tube Side Fluid Discharge of 5 Lpm and Hot Fluid Temperature of 60 C Firmansyah, Devian Arif; Handayani, Sri Utami
Journal of Vocational Studies on Applied Research Volume 5, Issue 2, Year 2023 (October 2023)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i2.19173

Abstract

A fluid's phase or temperature can be changed by a heat exchanger. To improve students' understanding of heat exchangers, the existence of a heat exchanger is essential. In the Energy Conversion Laboratory, a test bed for a shell and tube type heat exchanger with a 1pass shell - 2pass tubes was created to conduct this study. The performance of the heat exchanger was then evaluated, along with its efficiency and heat transfer coefficient. Heat transfer calculations and the effectiveness of shell and tube heat exchangers were used in this study's experimental methodology, which involved designing and building a test bed heat exchanger. The heat exchanger has 1.5 m of tube length, 19.05 mm of tube diameter, 25.4 mm of tube pitch, and a 10-inch shell diameter. Iron serves as the shell material, while 304 stainless steel serves as the tube material. The heat exchanger performance has a heat transfer coefficient of 133,868 W/m2oC and a heat exchanger actual effectiveness of 58.84%. The theoretical heat transfer coefficient (Utheoretical) and actual heat transfer coefficient (Uactual) values in open systems both rise as the discharge of cold water increases, and the theoretical heat transfer coefficient (Utheoretical) value is always greater than the actual heat transfer coefficient value (Uactual). The heat exchanger needs to be in a very constant state when collecting data since the rise in fluid temperature at T2, T3, and T4 will have an impact on the actual effectiveness calculations. Meanwhile, theoretical effectiveness states that the value of effectiveness will rise with increasing cold fluid discharge.
Effect of Sodium Hydroxide Treatment on Adsorption of Methylene Blue Based on Cellulose Nano Crystals Mustikaningrum, Mega; Adelina, Dina; Indrawati Sawali, Fikrah Dian; Afandy, Moh Azhar
Journal of Vocational Studies on Applied Research Volume 6, Issue 1, Year 2024 (April 2024)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v6i1.22505

Abstract

Methylene blue is one of the dye wastes that dissolve in the aquatic environment that cannot be directly degraded by the environment. If the quantity of this waste is large, it will become a compound that is toxic to the aquatic environment. One of the modern methods used to process this dye waste is adsorption. The adsorption method is a method of binding compounds with the help of adsorbents. One of the renewable adsorbent technologies comes from cellulose. Cellulose is often used because it has active groups that are quite effective in binding certain compounds. In this study, cellulose IV was produced, called nano cellulose crystals. Cellulose generally consists of amorphous and crystalline parts. The cellulose produced is hydrolyzed with sulfuric acid to remove the amorphous part so that only crystalline cellulose is obtained, followed by the help of ultrasonic waves to break the size into a nano form which is expected to have a large surface area. As a result of the hydrolysis stage, the nano cellulose crystals produced have sulfate groups that can bind methylene blue which when dissolved in water becomes cationic. This force is called electrostatic force. Some important stages of cellulose nanocrystal production are alkaline treatment, bleaching, hydrolysis, sonication, and freeze-drying. This study focuses on the effect of NaOH concentration used in alkaline treatment. NaOH in this case functions to dissolve impurities such as hemicellulose and lignin in a biomass. Removal of hemicellulose and lignin greatly affects the yield of cellulose produced. Based on the results of the study using 3,4, and 5% NaOH produced cellulose percentages of 38.7121; 39.7949, and 39.9138%, respectively. Cellulose content ultimately affects the number of active groups that bind methylene blue. The adsorption study evidences this obtained the percentage of removal at each concentration of 67.685; 70.837 and 71.823%. Another objective of this study was also to get the constant value of the extraction rate at each NaOH concentration used in the adsorption process. The values obtained were 0.0029; 0.0032 and 0.0039 m/minute at each NaOH concentration used during the alkaline treatment process.
Nata De Coco Production with Addition of Antocyanin from Mangosteen Peel Extract Pratama, Irawan Adi; Amalia, Rizka; Mario, Abraham
Journal of Vocational Studies on Applied Research Volume 5, Issue 2, Year 2023 (October 2023)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i2.21822

Abstract

Mangosteen peel is rich antioxidant compounds which are very beneficial for human health and this potential is being utilized by the community. Mangosteen peel extract contains anthocyanin compounds. Anthocyanin are considered as active compounds whose consumption is associated with beneficial health effects. Nata de coco has many benefits for health, especially digestion, because of its high fiber content, low calories, and does not contain cholesterol. This research examines the optimum operating conditions of the nata de coco production process with the addition of mangosteen peel anthocyanin extract and the characteristics of the resulting nata de coco. This research study was carried out with various variables including: The ratio between mangosteen peel extract and coconut water (1:19 and 9:1 (v/v)), fermentation time 10 and 13 days), and Acetobacter xylinum volume (2,5% and 10%). During the research, the water content of the mangosteen peel was analyzed for yield and Total Anthocyanin Content. The result product were tested in thickness, weight, organoleptic, pH, crude fiber content, and Total Anthocyanin Content of Nata de Coco.
Managing University Accreditation Documents with an Online-Based Data Collection System Alim, Ilmam Fauzi Hashbil; Subari, Arkhan
Journal of Vocational Studies on Applied Research Volume 6, Issue 1, Year 2024 (April 2024)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v6i1.24484

Abstract

By implementing digitalization, organizations and companies can increase and maintain competitive advantage, because it can increase productivity, innovation and reduce costs. One of the activities carried out by organizations is data management, including organizations operating in the education sector, such as universities. In managing a university, there are various kinds of data that must be managed. Data on the number of students, number of research studies, number of services, etc. need to be managed well. The data is usually stored in several separate places. If managers need information, they have to collect the data from several sources and process it manually using software such as Microsoft Word or Microsoft Excel. This causes the process of searching for information to take a long time, because there are several stages that must be carried out before getting the information in question. In this study, we developed web-based data management information system in universities using Waterfall Software Development Lifecycle (SDLC) method. The information system that was developed passed the Black Box method test with 100% of the possible points. According to this outcome, every feature created is in line with the executed design.
Characteristics of Biodegradable Plastic From Cassava Starch With α-Cyclodextrin Based On Chitosan And Glycerol Composition Purwanti, Oktavia Tri; Shabrina, Alifa Nur; Dermawan, Bagas; Insani, Reza Kautsar
Journal of Vocational Studies on Applied Research Volume 6, Issue 2, Year 2024 (October 2024)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v6i2.25114

Abstract

Plastic waste is one of the big problems in Indonesia. Plastic cannot be decomposed and is degraded by microorganisms. Therefore, research is needed on plastic materials that can be broken down, which is biodegradable plastic. Biodegradable plastic can be made from tuber materials such as cassava starch and chitosan composites which are easily degraded by microorganisms. The addition of α -cyclodextrin and glycerol is expected to add flexibility and elasticity to biodegradable plastic. At the stage of making biodegradable plastic, biodegradable plastic material is made by using a blending method and dried at an oven temperature of 50°C for 20 hours. The main ingredients of biodegradable plastic are cassava starch 0,65 gram and α -cyclodextrin 3,25 gram. Additional ingredients are glycerol (1; 1,5; and 2) mL and chitosan (1,3; 1,35; and 1,4) grams. The characteristics of biodegradable plastic were carried out by FTIR analysis, tensile strength test, elongation test, and biodegradable test. Biodegradable plastic test results for optimal tensile strength values for 1 mL glycerol and 1,4 gram chitosan were found to be 5,26 Mpa. The optimal percent elongation test results were 131, 7% for 1,5 mL glycerol and 1,3 gram chitosan. In the biodegradation test, biodegradable plastic was degraded on the 7 days.  
Virgin Coconut Oil: Enzymatic and Acidification Methods for Production – A Review Harun, Rizqi Fadhilah; Ichwan, Muhammad Maulana; Ardani, Raka; Kusumayanti, Heny
Journal of Vocational Studies on Applied Research Volume 6, Issue 2, Year 2024 (October 2024)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v6i2.22810

Abstract

Making Virgin Coconut Oil (VCO) was an important process in the coconut oil industry, which had potential for medical and beauty applications. This article discussed the method of making VCO using fermentation and enzymatic approaches. Making VCO involved several stages, including making coconut milk, adding ingredients such as pieces of young papaya, pineapple tubers, and yeast tape, and settling and separating the oil liquid. Adding papain and bromelain enzymes in the enzymatic process had been proven to increase the yield of coconut oil compared to fermentation methods without adding enzymes. Enzyme concentration and incubation time influenced the yield of VCO, with increasing enzyme concentration and optimal incubation time increasing oil production. This literature review provided insight into the potential of fermentation and enzymatic methods in VCO production, as well as provided a systematic framework for testing the effectiveness and quality of VCO produced through innovative approaches. The VCO manufacturing method using an enzymatic approach had the potential to increase coconut oil production yields and meet established quality standards.
Extract Tamarillo (Solanum Betaceum) as Natural Dye for Formulation of Moisturizing Lip Laurani, Destyc Pratiwi; Kusumayanti, Heny; Afiyanto, Putri Solihah; Revabelita, Aisha
Journal of Vocational Studies on Applied Research Volume 6, Issue 2, Year 2024 (October 2024)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v6i2.23975

Abstract

The cosmetics industry is experiencing rapid growth, offering a diverse array of products designed to enhance appearance and promote skin health. Among these products, lip moisturizers are particularly important, serving to maintain lip moisture and health while enhancing attractiveness. The trend toward natural ingredients in cosmetics is on the rise due to their perceived safety and environmental benefits compared to synthetic alternatives. In this study, tamarillo (Solanum betaceum) extract is utilized as both a nutrient and a natural colorant in lip balm. Tamarillo is rich in anthocyanins, which provide natural coloration and antioxidant properties, helping to combat free radicals, hydrate, soften the skin, and reduce dryness. This research aims to develop a lip balm formulation incorporating tamarillo extract at varying concentrations. The study is conducted experimentally, with lip balm formulations prepared using tamarillo extract at 4% and 6% concentrations. The lip balm's quality is assessed through organoleptic testing, homogeneity, stability, melting point, pH, irritation potential, and moisturizing effectiveness over a two-week period. The resulting lip balm product is anticipated to be an innovative solution for addressing dry, chapped, and dull lips, with potential for further development.

Page 7 of 8 | Total Record : 75

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