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Jurnal Ilmu Dasar
Published by Universitas Jember
ISSN : 24425613     EISSN : -     DOI : https://doi.org/10.19184/jid.v24i2.36657
Core Subject : Education, Engineering,
Control & Systems Engineering Mathematics
Jurnal ILMU DASAR (JID) is a national peer-reviewed and open access journal that publishes research papers encompasses all aspects of natural sciences including Mathematics, Physics, Chemistry and Biology. JID publishes 2 issues in 1 volume per year. First published, volume 1 issue 1, in January 2000 and avalaible in electronically since 2012 with ISSN 1411-5735 (Print) and avalaible in electronically since 2012 with ISSN 2442-5613 (online). Jurnal ILMU DASAR is accredited SINTA 3 by the Ministry of Education, Culture, Research, and Technology of the Republic of Indonesia (Kemendibukristek) No. 152/E/KPT/2023 (September 25, 2023), Ministry of Research, Technology and Higher Education of the Republic of Indonesia (RISTEKDIKTI), No. 200/M/KPT/2020 (December. 23, 2020). All accepted manuscripts will be published worldwide JID has been indexed in DOAJ, Dimension, OCLC WorldCat, PKP Index, Crossref, Google Scholar, Base, Garuda, and OneSearch. JID have been collaborated in KOBI-ID (Konsorsium Biologi Indonesia) and HKI (Himpunan Kimia Indonesia) since 2017.
Arjuna Subject : Matematika - Kontrol dan Optimasi
Articles 415 Documents
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The Effect of Taro Tuber Starch (Colocasia esculenta (L.) schott) Addition to Characteristic of Biodegradable Plastic with PVA Polymer and Calcium Carbonate (CaCO3) Filler Saraswati, Endah; Syahbanu, Intan; Adhitiyawarman, Adhitiyawarman
Jurnal ILMU DASAR Vol 24 No 1 (2023)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v24i1.33409

Abstract

The preparation of biodegradable plastics based on polyvinyl alcohol (PVA)-taro starch as an alternative to synthetic plastics has been conducted. The aim of this research was to identify the effect of taro starch composition on the production of biodegradable plastic and their characteristics in an aquatic environment. The solution casting method was used to produce biodegradable plastic. PVA was dissolved in hot distilled water, and taro starch (0; 0.5; 1.5; 2.5; and 3.5 g) was dissolved in another chamber filled with distilled water, glycerol and citric acid. Both solutions were mixed together and CaCO3 was then added. The mixture was casted on acrylic plates while biodegradable plastic without starch was used as a control. Characteristic of Biodegradable plastic and it’s properties were examined by Fourier Transform Infra Red (FTIR), water uptake, and moisture absorption test. While the biodegrability of the sample were tested in river water media in the laboratory. The results showed that the wave number at 1698-1712 cm-1, indicating that the cross-linking between PVA and the starch occured. Water uptake and moisture absorption tests showed that all of the biodegradable plastic varieties produced were hydrophilic. The biodegradation test showed that the largest degree of decomposition was reached by the PVA-starch 3.5 g variety which was 80.33%. Thus, the more starch on biodegradable plastic, the more biodegradation achieved.
Microcellulose from Betel Husk Fiber as Filler in Bioplastic Kuswariyah, Ratmi; Sitorus, Berlian; Adhitiyawarman, Adhitiyawarman; Antonius, Antonius
Jurnal ILMU DASAR Vol 24 No 1 (2023)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v24i1.34023

Abstract

Betel nut husk fiber has a reasonably high cellulose content. Meanwhile, bioplastics nowadays are mostly made of Poly Vinyl Alcohol (PVA), with one of its limitations being tensile strength and other properties regarding mechanical. Thus, this study aims to isolate microcellulose from areca nut fiber and use the fiber as a filler in bioplastic, where cellulose is combined with PVA. The intention is to understand the effect of adding microcellulose from betel nut fibers on the properties, including the biodegradability of PVA-based bioplastic films. This research has three steps: isolating cellulose from betel nut peel fibers by delignification, pulping, and bleaching. The next step is hydrolysis to obtain microcellulose. The last is the preparation of bioplastic films using the solution casting method, with five different ratios of microcellulose content in the bioplastic. The cellulose characterization from FTIR spectra shows the absorption of several peaks, such as O-H, C-H, and C-O functional groups. The mechanical testing results on the variation of bioplastic show that the bioplastic with the best characteristics was PL5, which has the highest microcellulose content, 8 MPa and 10.2% for tensile strength and elongation, respectively. The biodegradation test for bioplastic variation (PL5) was 82% within eight weeks, while in Indonesian National Standard (SNI) number 7188.7:2016, it is 100% within 60 days.
Cover JID Volume 24 No 1 (2023) ILMU DASAR, Jurnal
Jurnal ILMU DASAR Vol 24 No 1 (2023)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Implementation of Discrete Time Markov Chain Method to Estimate The Transition of Smartphone Brands Usage in Balikpapan Asyrofi, Anang; Anggriani, Indira; Soemarsono, Annisa Rahmita
Jurnal ILMU DASAR Vol 24 No 2 (2023)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v24i2.34872

Abstract

The increasingly rapid competition in the industrial world today encourages all companies to be able to compete by prioritizing the products they offer, one of which is smartphones. Indonesia is one of the countries with the largest smartphone market share in Asia, with the number of active smartphone users in Indonesia reaching 177 million people in 2021 according to data released by the Statista research institute in March 2022. With these conditions, many smartphone companies always follow the direction of development of sophisticated communication technology media and offer a variety of complete and attractive facilities to encourage people to buy these products. One method that can be used to model this uncertainty is Discrete Time Markov chain which can be implemented as a tool for decision making and predicting future events. Therefore, this study was conducted to know the shifting pattern of smartphone use by consumers and predict the shift in smartphone market share for the coming period. The results of the study found that the steady state or equilibrium condition was achieved in the 10th period or in 2032 with the steady state percentage of each brand, namely Samsung = 22.49%, Oppo = 20.82 %, Xiaomi = 17.01%, Realme = 11.54%, Vivo = 11.41%, Apple = 10.27%, and other brands = 6.46%. The increase in market share is predicted to occur in the Oppo, Realme, and Vivo brands, while the decrease in market share will occur in the Apple, Samsung, Xiaomi and other brands.
Characterization of Protease from Endophytic Fungi Fusarium sp. JE-DP4a Hastuty, Aerma; Herawati, Irma; Pikoli, Megga Ratnasari
Jurnal ILMU DASAR Vol 24 No 2 (2023)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v24i2.27293

Abstract

Protease is a catalytic enzyme that catalyzes a proteolysis process and breaks down a protein into smaller polypeptides or amino acids. Endophytic fungi can produce bioactive compounds, one of which is protease enzymes. The papaya leaf endophytic fungi used in this study was Fusarium sp. strain JE-DP4a. This study was conducted to determine the characterization of protease from endophytic fungi Fusarium sp. strain JE-DP4a with variations in incubation temperature of 30, 37, and 44oC and pH variation of 5.5-8. Measurement of protease enzyme activity using a spectrophotometer UV-Vis at 280 nm. Based on the research results, the highest protease activity produced at a temperature of 44oC is 53.78 U/mL, and specific activity is 17.31 U/mg protein. Protease activity at pH 7 shows the highest was 46.72 U/mL.Thus it is ably concluded that the protease produced by Fusarium sp. strain JE-DP4a belongs to the neutral protease group.
The Robust Model Predictive Control Design for Linear Interconnected Systems Afifah, Nida Nur; Solikhatun, S.
Jurnal ILMU DASAR Vol 24 No 2 (2023)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v24i2.36657

Abstract

In this paper, we discuss the design of robust model predictive control for linear interconnected systems by several constraints. Linear interconnected system is a complex systems which consist of several subsystems and the dynamic of subsystem is influenced by the states or outputs of the other subsystems. The systems are controlled by formulating and applying the model predictive control on each subsystems. We formulate the optimization problem that minimize the cost function for each subsystems. The optimization problem is solved by gradient method to get the minimum cost function. Numerical simulation was conducted to show the effectiveness and performance of robust model predictive control. Based on the results of the numerical simulation and test the robustness, it can be shown that the robust model predictive control is effective to control the linear interconnected systems.
A Review on Physical, Chemical and Optical Properties of Liquid Crystal Singh, Vinod Kumar; Singh, R. K.; Dhyani, Reena; Rawat, B. S.; Rawat, P. S.; Sharma, Hemlata; Kumar, Dr. Narinder
Jurnal ILMU DASAR Vol 24 No 2 (2023)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v24i2.35044

Abstract

The foundation of the upcoming generation of cutting-edge gadgets and digitally augmented technologies is expected to be smart soft materials. Because of their responsiveness and adaptability, liquid crystals (LCs) are promising smart soft materials. In the 20th century, LCs were crucial to changing the information display sector. However, several beyond-display uses for LCs have been proven at the turn of the twentieth century, neatly using their controlled stimuli-responsive and adaptable properties. New LC materials have been developed and engineered for such applications. The review comes close with a summary and viewpoints on the potential and problems facing LCs as smart soft materials. This review is expected to inspire a wide range of concepts for the application of nature's delicate phase of matter in the generation and beyond of smart and augmented devices.
Anti-Bacterial Activity of Etanolic Extract and Essential Oil of Basil (Ocimum sanctum) on Growth Staphylococcus aureus Salmonella thypii and Eschericia coli Perwitasari, Melania; Anindita, Reza; Beandrade, Maya Uzia; Nathalia, Dede Dwi; Hasmar, Wahyu Nuraini; Putri, Intan Kurnia
Jurnal ILMU DASAR Vol 24 No 2 (2023)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v24i2.31367

Abstract

Antimicrobial resistance is one of the biggest health problems. Indonesia is a country with a positive high number of E. coli (71%) Extended Spectrum Beta Lactamase (ESBL) in the Asia Pacific. Many studies report that essential oils and extracts from several species of Ocimum have antimicrobial activity against gram-positive and negative bacteria. Antibacterial activity is related to active compounds contained in plants that are also affected by the place of growth, harvesting and post-harvesting. Research related to the activity of basil (Ocimum sanctum) that already exists does not provide complete and comprehensive data related to where to grow, harvest and post-harvest basil leaves. Basil leaves that have been set parameters for growth, harvest and post-harvest processes are extracted using maceration method with 70% etanol solvent and distilled to obtain essential oils (EO). Etanolic extract (EE) and EO were tested for their activity against Escherichia coli, Staphylococcus aureus and Salmonella thypii bacteria. The results showed that the basil leaves obtained from Margahayu sub-district, East Bekasi, had a dry simplicia yield of 12.8% ± 1.5, yield of EE 16.9% ± 1.6, EO content of 0.56%. The etanolic extract of basil leaves contains alkaloids, saponins, tannins, phenolics, flavonoids, glycosides, triterpenoids and steroids. The conclusion from the results of this study is the etanol extract and essential oils of basil leaves can inhibit the growth of bacteria, both basile leaves. The inhibition zone diameter is higher in gram positive bacteria (S. aureus) than gram negative bacteria (S. thypii and E. coli).
Design and Construction of Electrical Energy Source Panel Based on Thermoelectric Generators on Mild Steel Galvalume Maulana, Bima Wahyu; Misto, M.; Arkundato, Artoto; Mulyono, Tri
Jurnal ILMU DASAR Vol 24 No 2 (2023)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v24i2.26255

Abstract

A thermoelectric generator (TEG) is a device that converts heat energy into electrical energy. The working principle of this device is based on Seebeck's law, namely this device will produce electrical energy if the cold side and hot side of this device have a temperature difference value of . This device can be used for generator panels whose heat source comes from the sun. The cold side of the TEG is conditioned by utilizing water fluid which is passed over the heatsink. The temperature difference between the hot and cold sides of the TEG generates an electric voltage through the Seebeck effect. The parameters observed in the research on electricity generation using this TEG are voltage, current, electric power, and the temperature difference between the hot and cold sides. The resulting parameter values are as follows; average voltage (0.5495 volts), average electric current strength of 0.04 A, average electric power (0.022 watts). mean temperature difference (16.006 oC). The largest average Seebeck coefficient is 0.0413 V/oC.
Construction and expression of Wee1 recombinant protein in Escherichia coli strain BL21 (DE3) Oktapan, Ladefa Primana; Maulani, Ardela Alief; Ermawati, Netty; Sugiharto, Bambang
Jurnal ILMU DASAR Vol 24 No 2 (2023)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v24i2.28232

Abstract

Wee1 is a gene encoding for protein kinase that is located in the nucleus and it plays an essential role in determining the timing of mitosis. Overexpression of Wee1 in rice is resulting in increased plant size. However, the increasing plant size due to the increase of Wee1 protein expression is not elucidated. Immunodiagnostic using specific antibodies against Wee1 protein should be conducted to determine the role of the protein on cell division. This experiment was directed to construct Wee1 in an expression vector for synthesis of recombinant Wee1 protein using three strategies of construction. The three strategies were construction of full length (FL), deletion of putative binding site (BS), and deletion of N-terminal domain (ΔN) of Wee1. Restriction analysis with BamH1/Sal1 of FL-Wee1, BS-Wee1, and ΔN-Wee1 construct resulted in the different DNA fragments with molecular size at 1239, 1176, and 960bp, respectively. This result indicated that the Wee1 fragments have been successfully inserted in the expression plasmid which was further confirmed using DNA sequencing. Colony PCR analysis showed that Escherichia coli strain BL21 (DE3) has been transformed with the constructs. The protein analysis using SDS-PAGE revealed that the recombinant protein of Wee1 synthesized in the E.coli containing ΔN-Wee1 construct, but not in FL-Wee1 and BS-Wee1 constructs. The ΔN-Wee1 protein was synthesized in an insoluble fraction with a molecular size of 38.8 kDa which is the same as the size estimated using the software ExPASy. Interestingly, the level of synthesized ΔN-Wee1 protein was not induced by IPTG concentration. Collectively, the results indicated that the DNA construct of ΔN-Wee1 is suitable for recombinant protein production.

Page 37 of 42 | Total Record : 415

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