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Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA), is a multi-disciplinary and engineering journal published since 2021 byLLDikti Wilayah 1. Each issue consists of a minimum of 5 articles, the scope of this journal is Mathematics, Chemistry, Physics, Biology, Statistics, Agricultural and Biological Sciences, Biotechnology and Agro-industry, Chemical and Pharmaceutical Sciences, Computer Science, Materials Science, Physics and Astronomy, Biomedical Engineering.
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Sumatera utara
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Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA)
Published by LLDIKTI Wilayah 1
ISSN : 28073142     EISSN : 28073142     DOI : https://doi.org/10.54076/jumpa
Core Subject : Science, Education, Social, Engineering,
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Environmental Science Mathematics Mechanical Engineering Neuroscience Physics
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA), provides a forum for publishing the original research articles, review articles from contributors, and the novel technology news related to natural sciences and mathematics research. Scientific articles dealing with fundamental sciences, material sciences, mathematics, materials characterization, etc. are particularly welcome. The journal encompasses research articles, original research report, reviews, short communications and scientific commentaries in fundamental sciences and mathematics including: fundamental sciences, fundamental physics, fundamental chemistry, fundamental biology, mathematics, applied sciences, Physics, applied physics, applied chemistry, Biology, applied biology, Statistics, applied mathematics, Agricultural and Biological Sciences, Chemical and Pharmaceutical Sciences, Computer Science, Materials Science, Physics and Astronomy, Biomedical Engineering and materials characterization, and which are included in the related fields.
Arjuna Subject : Matematika - Ilmu Komputer Teoritis
Articles 31 Documents
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The Effect of Mount Sinabung Volcanic Dust Mixture on The Strength of Construction Ceramics Dosni Tahi Sipahutar
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 1 No. 1 (2021): March: Mathematics and natural science
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah I Sumatra Utara (LLDikti I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54076/jumpa.v1i1.32

Abstract

It has been made of construction ceramics using the volcanic dust of Mount Sinabung combined with kaolin, clay, feldspar and water as a mixture. with the composition of kaolin, feldspar, clay, volcanic dust of Mount Sinabung. Sample making is done starting with the sifting stage of 100 mesh materials and mixing materials up to homogeneous 15 minutes, printing with a 5 ton emphasis with a temperature combustion of 1100oc and in hold for 2 hours. With the characteristics of construction ceramics has been tested that is shrinkage mass 6.99-13.53%; porosity 4.84-10.46%; strong press 2.5-14.6 Mpa; hardness 84.7-169.6 kgf/mm2.
Boosting Stemmer Performance Using Cache Method Muhammad Fadly Tanjung
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 1 No. 1 (2021): March: Mathematics and natural science
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah I Sumatra Utara (LLDikti I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54076/jumpa.v1i1.34

Abstract

Stemming is the process of returning the word to the base word by disappearing the append. This is important to support better information re-meeting. Some research in stemming algorithms includes nazief &adriani algorithms, confix stripping, enhanced confix stripping, arifin and porter algorithms. The stemming algorithm for Bahasa Indonesia is divided into two, namely those that use a dictionary and do not use a dictionary. Some studies have shown that stemmers that use dictionary have high accuracy but low process speed, while stemmers that do not use dictionary have low accuracy but higher process speed. In this study, two methods were used: the stemmer method using cache and stemmer without cache to see the comparison of process speed from stemmers that use dictionary. The test data for this study is text data obtained from the corpus site. Process analysis is completed by calculating each speed, memory usage and cpu of each method, then each method is compared. Results from tests from test data showed that the cache method improved stemmer performance.
Making Oxalic Acid From Palm Oil Pelepah (Elaeis Guineensis) Through Nitric Acid Oxidation Reaction Ihwan Rahmadi
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 1 No. 1 (2021): March: Mathematics and natural science
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah I Sumatra Utara (LLDikti I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54076/jumpa.v1i1.36

Abstract

Palm oil palm is one of the solid waste produced by oil palm plantations every harvest. Chemical analysis of palm oil palm oil pellets showed that there are components of cellulose, hemiscellulose, and lignin that show that palm oil pellets have the opportunity to be further processed into useful and economically valuable products. Palm waste contains cellulose by 34.89%, hemiscellulose by 27.14%, and lignin by 19.87%. The analysis conducted on raw materials includes the analysis of water content and cellulose levels of palm oil palm oil. 46.6% and cellulose levels of 29.2%. In this study quantitative analysis was conducted in the form of cellulose conversion and oxalic acid yield. The largest cellulose conversion was obtained at the use of 70% nitric acid concentration and 80 minutes reaction time of 58.56%.
Manufacture and Characterization of Pineapple Leaf Fiber Composite Board With Polypropylene Adhesive Fatimah Marwa Nasution
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 1 No. 1 (2021): March: Mathematics and natural science
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah I Sumatra Utara (LLDikti I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54076/jumpa.v1i1.37

Abstract

Research has been conducted on the manufacture and characterization of pineapple leaf fiber composites – polypropylene matrix. Samples with comparison of pineapple leaf fiber composition: polypropylene matrix by 0 %: 100%, 5%: 95%, 10%:90%, 15%:85%, 20%;80%, and 25%:75%. The manufacture of SDN-PP composites, i.e. fiber soaked with NaOH 5% for 2 hours and then rinsed with clean water and dried, then weighed. Polypropylene and MAPP are effluxed with xylen solvent using a reflux device over a hot plate with a temperature of 17oC until melted. The polypropylene that has been diflux weighed in mass and pineapple leaf fibers are placed into a mold then pressed with a hot press at a temperature of 150oC for 30 minutes. The purpose of the study was to find out the physical and mechanical properties of pineapple leaf-matrix polypropylene fibers. Density values 0.75 g/cm3 to 0.9 g/cm3, water absorption values 0.54% to 14.38%, strong compressive values 25.09 MPa to 49.58 MPa, and strong values impact 9.74 J/mm2 to 34.18 J/mm2. Pineapple leaf fiber composite – the resulting polypropylene matrix can be categorized as a high-crust fiberboard (HF) and applied as a decorative board in accordance with the fiberboard standards set out in SNI 01-4449-2006.
Message Security Using a Combination of Hill Cipher and RSA Algorithms Yogi Suryo Santoso
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 1 No. 1 (2021): March: Mathematics and natural science
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah I Sumatra Utara (LLDikti I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54076/jumpa.v1i1.38

Abstract

The process of exchanging digital messages is increasingly being used due to its easy and practical use. But the process of exchanging digital messages is vulnerable to being tapped by unauthorized people. Cryptography is the study of mathematical techniques related to aspects of information security, such as data confidentiality, data validity, data integrity, and data authentication. With cryptography, the process of exchanging messages between two people can be done securely. Thus, cryptographic techniques are used to overcome security issues when exchanging messages. The methods used in this study are hybrid hill cipher and RSA cryptography. In this study it was shown that hybrid hill cipher cryptography with a 3x3 matrix key and RSA with a 512 bit key can overcome security issues when exchanging data so that messages sent cannot be read by unauthorized people.
Comparison Of Formulations And Antioxidant Activity Of Transparent Soap From Red And Black Plum (Prunus domestica L.) Yessi Febriani; Mierza, Vriezka; Septimar, Elviza
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 1 No. 2 (2021): September: Mathematics and natural science
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah I Sumatra Utara (LLDikti I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54076/jumpa.v1i2.45

Abstract

Transparent soap is a type of soap for the face and body to cleanse and protect the skin from free radicals. Plums are fruits that have very high antioxidant capabilities, because they have the content of flavonoids and tannins. This research aims to make transparent soap with the addition of red and black plum juice and compare the antioxidant activity capabilities of soap. This research captures the process of taking cider, phytochemical screening, and soap making. Analysis is pH test, moisture content, foam stability, free alkaline, and antioxidant activity test with DPPH method. The results of the antioxidant activity test are very strong with a value of IC50 < 50 ppm namely red plum juice (30.83 ppm), black plum juice (47.74 ppm), red plum soap (16.52 ppm), black plum soap (12.08 ppm). Soap has a pH of negative blanko (8.5), positive blanko (8.3), red plum (8.6), black plum (8.0). Water content of blanko soap is negative (1.88), blanko positive (2.69), red plum (1.76), black plum (1.83). Negative blanko soap foam stability (50), positive blanko (20), red plum (45), black plum (65), and alkaline free negative blanko soap (0.04), positive blanko (0.08), red plum (0.05), black plum (0.06). Transparent soap meets the quality requirements in accordance with SNI 3532:2016.
The Differences Of Student's Mathematics Ability Using The Whatsapp Group And Classroom Platform During Pandemic Covid-19 Agustin, Susi; Sari, Dira Puspita
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 1 No. 2 (2021): September: Mathematics and natural science
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah I Sumatra Utara (LLDikti I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54076/jumpa.v1i2.61

Abstract

The purpose of this study was to determine the differences in students' mathematical abilities using the WhatsApp group and classroom platforms during the Covid-19 pandemic in class VIII of SMP Negeri 2 Hinai. This research method is to use quasi-experimental research. The number of samples in this study were 60 students divided into 2 class groups, namely the experimental class 1 which was taught using WhatsApp group, and the experimental class 2 which was taught using classroom. The data collection instruments were in the form of tests of students' mathematical understanding abilities before and after being given treatment (pretest and posttest). Based on the results of hypothesis testing with the t test technique, the value of t count> t table is 2.16> 2.04 so it can be concluded that there are differences in students' mathematical abilities using the WhatsApp group platform and classrooms during the Covid-19 pandemic in class VIII SMP. Negeri 2 Hinai. Students 'mathematical abilities using the WhatsApp group platform are superior to students' mathematical abilities using classroom.
Decision Support System in Determining Scholarship Recipient Lecturers Using the Simple Additive Weighting (SAW) Method Pangaribuan, Nissi
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 1 No. 2 (2021): September: Mathematics and natural science
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah I Sumatra Utara (LLDikti I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54076/jumpa.v1i2.124

Abstract

The role of lecturers in higher education is one of the most influential parts of the quality of students produced. The educational qualification of lecturers is an important aspect of academic and institutional quality. So that many universities or educational institutions provide doctoral scholarship programs for potential lecturers.One of them is the Catholic University of Santo Thomas, Medan, which provides scholarships, namely doctoral scholarships for 5 outstanding lecturers. This research is a decision support system for doctoral scholarship recipients at the Catholic University of Santo Thomas Medan using the Simple Additive Weigting (SAW) method. The SAW method is used to determine the recipient of the S3 scholarship which is determined based on the criteria. This decision support system is built with a web-based application system as a tool in determining the decisions of lecturers who receive doctoral scholarships at the Catholic University of Santo Thomas Medan and uses MYSQL as a database.
Application of Topsis Method in Decision Support System Selection of Undergraduate Scholarship Recipients Matanari, Romiana
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 1 No. 2 (2021): September: Mathematics and natural science
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah I Sumatra Utara (LLDikti I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54076/jumpa.v1i2.141

Abstract

The procurement of scholarship programs is one of the efforts made by the government, companies, or foundations to help individuals for the ongoing education that is being pursued, one of which is in the world of education such as STMIK Pelita Nusantara, where the campus is under the auspices of the Democrat Cemerlang Foundation, a foundation that participate in the provision of scholarship programs, both underprivileged scholarships and merit scholarships. In granting scholarships, many things must be considered so that the right decisions are made, namely the best students who meet the requirements and criteria that have been set and are not subjective. so far pthe campus is experiencing difficulties because there are many students who graduate each year while there are many conditions that must be considered, so faster, more precise and accurate steps are needed to help the campus determine students who are eligible to receive the scholarship.In this study, the TOPSIS method will be applied to select undergraduate scholarship recipients. The method was chosen because TOPSIS is a method whose basic concept is that the best alternative is the alternative that has the closest distance from the positive ideal solution and has the farthest distance from the negative ideal solution from the point of view ofgeometrically using Eucledian distance to determine the relative proximity of an alternative to the optimal solution. The results obtained in this study are that the TOPSIS method using 5 criteria can be applied in the selection of undergraduate scholarship recipients, where 2 out of 5 alternatives have the highest score of 0.657659 as well as scholarship recipients.
Disaster Preparedness Analysis At Intensive Health Centers In Toba Regency In 2020 Pardede, Mangapul; EL- Matury, Herlina J.; Batubara, Saiful
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 1 No. 2 (2021): September: Mathematics and natural science
Publisher : Lembaga Layanan Pendidikan Tinggi Wilayah I Sumatra Utara (LLDikti I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54076/jumpa.v1i2.153

Abstract

This study analyzes the level of disaster preparedness in inpatient health centers in Toba Regency. The variables studied were disaster potential, structural safety, non-structural safety, and functional aspects. The results showed that the preparedness scores for the Ajibata Inpatient Health Center and the Parsoburan Inpatient Health Center required both inpatient health centers to intervene in the near future because they still had risks when facing disasters. Meanwhile, the Laguboti Inpatient Health Center is considered capable of protecting human life and still functioning in the event of a disaster. The structural safety score of the Ajibata Inpatient Health Center reflects that the structural security is adequate for disaster events. Meanwhile, the Parsoburan Inpatient Health Center still has a risk for disaster events. The non-structural safety scores of the Ajibata and Laguboti Inpatient Health Centers both still have risks in dealing with disasters. The Parsoburan Inpatient Health Center is not ready to face a disaster. The value of the functional aspects of the three Inpatient Health Centers shows that the three Inpatient Health Centers are not functionally ready to face disaster events. It is recommended that the three Inpatient Health Centers should continue to improve disaster preparedness.

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