cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
HENGKI TAMANDO
Contact Email
hengki_tamando@yahoo.com
Phone
+6281262232710
Journal Mail Official
jurnal.lldikti1@gmail.com
Editorial Address
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.
Location
Kota medan,
Sumatera utara
INDONESIA
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
 1   2   3   4 
Comparison Of Thermo Gravimetric Characterization Of Active Carbon Analyzer Rice Husk With Rice Husk Implementation Zurairah, Masdania; Saragih, Edy Syahputra; Misdawati, Misdawati
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.v1i2.176

Abstract

Research has been done on rice husks. Rice husk is carried out in the carbonization process which is then carried out by the activation process. Furthermore, from the activation process, the impregnation process is carried out. Characterization using a thermo gravimetric analyzer (TGA) showed that the residue of impregnation of rice husk activated carbon was 61.83% and rice husk activated carbon was 89.72%.
Analysis of Preservatives in Packaged Drinks with Chromatography Techniques Merry Yunita
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 2 No. 1 (2022): 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.v2i1.204

Abstract

A research has been conducted on qualitative and quantitative of soft drinks preservative analysis. The analysis used chromathography. The calibration kurve of real standard was used to determine the concent of preservative. The concents of the drinks preservative would be suitable for the standard of preservative of Minister of Publik Health R.I No. 722/Menkes/per/IX/1988. The data was analyzed by using correlation and signification method between area and concentration and the result of the research has fulfilled quality standard of preservative
ISOLATION AND NODULATION TEST OF Rhizobium sp. FROM Pueraria javanica (Benth.) Benth. AND LIABILITY TEST ON THE CARRIER MEDIUM OF PEAT AND COMPOST FROM PALM OIL PALM EMPTY FRUITS Agnes Siska Situmorang
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 2 No. 1 (2022): 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.v2i1.205

Abstract

Isolation and Nodulation Rhizobium sp. from Pueraria javanica (Benth.) Benth. and Study of  Its Survival on Peat Soil and Compost of Oil Palm Empty Fruit Bunch was done from March to July 2008, in the Laboratory of Plant Biotechnology of Indonesian Oil Palm Research Institute (IOPRI) Marihat Research Station in Pematang Siantar, and Laboratory of Microbiology, Department of Biology, FMIPA USU. The sampel of nodules were taken from the roots of Pueraria javanica growing in the oil palm plantation at Sei Aek Pancur, Marihat, and University of North Sumatera. Ten isolates were isolated from the nodules and all of them could form root nodule after 8 weeks of inoculation in a nodulation trial. Another trial was conducted to study the survival of the Rhizobium in 2 different types of media: peat soil and compost of oil palm empty fruit bunch. It was found that all of the isolates could survive in both media during 4 weeks of observation. Statistically, the Rhizobium had a more stable viability in compost.
The Relationship of Phytoplankton Primary Productivity Values with Physical and Chemical Factors in Parapat Waters, Lake Toba erna ningsih
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 2 No. 1 (2022): 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.v2i1.207

Abstract

The aimed of this research were to investigate the relation of primary productivity value with the chemistry physic factor Parapat, Lake Toba. Primary productivity in Lake Toba from activity photosynthesis of done by chlorophyl. This research has been done during March 2009 at 3 sampling location around Parapat, Lake Toba. The locations research obtained base on variation activity to obtained location research.  Primary productivity was measured by the Oxygen Method were two bottles with a given conceration of phytoplankton (small aqutac organism) are suspended at the depth from wich the samples were obtained. The “dark” bottle is wrapped in aluminium foil to exclude light: “light” bottle is clear. A quantity of oxygen proportional to the total organic matter fixed (gross production) is produced by photosynthesis in the light bottle. At the same time, some of oxygen is being utilized in respiration. The other analysis would be conducted to measurement such as temperature, pH, DO, BOD, COD, nitrat, fospat, chlorophyl a, abundant phytoplankton, light penetration, light intensity. The value of primary productivity range from 112,608-825,792 mgC/m3/day and with the highest value of primary productivity equal to 825,792 mgC/m3/day obtained at the depth 7 m (station I), the value of chlorophyl equal to 62,013 mg/m3 obtained at the surface (station III) and the lowest value of chlorophyl a equal to o,801 mg/m3 obtained at the depth 3,5 m (station III), beside the value of phytoplankton equal to 3306,12 ind/l obtained at the depth surface (station I) and the value of phytoplankton equal to 1469,39 ind/. According to statistical the test obtained that there no significance difference of value of primary productivity which is compared between station or depth.
The Effect of Addition of Ash from Burning Wood Powder to the Mechanical and Physical Properties of Concrete yusnitaerna erna
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 2 No. 1 (2022): 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.v2i1.208

Abstract

The wood powder is the waste from woods industry that further used as a mixture of plant soil. Scientist have used the powder of wood to make a particle board. This research, We used the ash of wood powder as an additive thing in the concrete mixture. The test is done for physics and mechanics of the concrete. The sample is made from the ingredients 1 cement : 2 sand : 3 pebble. In variation add to ash of the wood powder for cement is 5%, 10%, and 15%. The result of the researching show that the used of the ash of wood powder can build the impact of the concrete is 9.54% from normal concrete with the mixture of the ash of wood powder is 15%. Orther side for the physics, the water absorption and porosity with the ash of the wood powder is from 4.94% to 14.35% and from 4.16% to 14.89% higher than the normal concrete.
Manufacturing of Ceramic Reinforced Metal Matrix Composites (Al/Sicp) And Their Characterization Through Powder Metallurgy Methods Jepriandi Ginting
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 2 No. 1 (2022): 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.v2i1.209

Abstract

Metal Matrix Composites is two or more combination material with aluminum metal as matrix and devolved to fix metal act, strength, high temperature stability and hardness. Metal matrix composites have been developed so many because it has low density, corrosion proof, cheap and easy fabrication. Powder metallurgy technique is one of metal matrix composites fabrication process in solid state that is still developed because more economic, doesn't need difficult equipment. Aluminum that use in this research is Al alloy type 2124. Metal matrix composites fabrication process with powder metallurgy method using wet mixing with pure ethanol, cold compaction 300 MPa and inert gas atmospheric using Nitrogen gas (N2) at sintering process. Variation of sinter temperature that used is 450, 500, 550, and 600 oC with highly temperature average 5 oC/min and holding time for 1 hour and with speed flow Nitrogen gas (N2) 5 lt/min with pressure 1000 kgf/cm2. From research result can be concluded the mechanical properties and physical properties from metal matrix composites reinforced ceramics Al/SiCp increase with sinter temperature highly and with reinforcement particle addition SiC can increase mechanical properties and physical properties such as: hardness, wear resistance, coefficient of thermal expansion and corrosion resistance. From microstructure analysis, particle Sic distributed homogeneously at test specimen based on SEM analysis, and structure crystal analysis test result XRD show that dominant phase appear is Al, and Sic.
The The Signage Placement Directions On The Pedestarian Path, Iskandar Muda Road, Medan City Hibnul Walid; Indra Kesuma Hadi; Muhammad Amin; Surta Ria Nurliana Panjaitan; Rizky Franchitika
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 2 No. 1 (2022): 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.v2i1.224

Abstract

The city of Medan as the capital city of North Sumatra Province has made significant progress. This coTechnology and Computer Sciencemmercial buildings in several places, one of which was in the Jalan Iskandar Muda corridor. In general, these buildings are spread along road corridors that function as commercial areas in the city of Medan. Presence signage on Jalan Iskandar Muda, Medan City, it turns out that they tend to maximize the economic potential of the region, resulting in a shift in the function of urban space into a space for advertising media expression. As an effort to create city comfort that supports visual aesthetics and does not interfere with pedestrian comfort, this research produces a design concept in the form of placement signage according to the designated zone, namely in the pedestrian zone, the design of the height proportion signage to the width of the pedestrian path using a human scale approach, panel or plane dimension design signage by using the concept golden section, as well as setting the point of placement or spread signage using the concept of rhythm and local regulations that have been established with the aim of limiting the number of signage on the pedestrian path.
Design of a Light Intensity Regulator with Remote Control for Incandescent Lamps Akhmad Yani
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 2 No. 2 (2022): 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.v2i2.227

Abstract

Research has been carried out on the design of a light intensity regulator with a remote control on incandescent lamps. This study aims to design and manufacture a light intensity controller that can be controlled remotely. This research uses Infrared Light Emitting Diode (LED) as transmitter and phototransistor module as receiver. The results of this study indicate that the tool that has been successfully designed and made can function up to a distance of 300 cm.
Design of a Light Intensity Regulator with Remote Control for Incandescent Lamps Januar
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 2 No. 2 (2022): 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.v2i2.228

Abstract

One of the uses of rice washing water is to make nata de rice or bacterial cellulose. This study was conducted to determine the effect of glucose mass and fermentation time on the viscosity of nata de rice. The study was conducted using 1000 ml of water to wash rice then added 10 ml of acetic acid, glucose with 50 grams, 75 grams and 100 grams, 5 grams urea, Acebacter xylinum starter as much as 100 ml then fermented. up to 14 days. Parameters analyzed were glucose mass and time of optimum fermentation conditions on the thickness of nata de rice. Thickness measurements were carried out using shear anchors. The results showed that the optimum thickness of nata was the addition of 100 grams of glucose with an optimum thickness of 17 mm and the optimum time was on the 14th day during fermentation.
Determination of Protein Content by Spectrophotometric Method and Fat Content by Soxhletation Method on Purple Kopek Eggplant and Green Kopek Eggplant Kartika Hasan
Jurnal Matematika Dan Ilmu Pengetahuan Alam LLDikti Wilayah 1 (JUMPA) Vol. 2 No. 2 (2022): 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.v2i2.229

Abstract

The type of research is quantitative research which is concerned with determining how much certain substances are contained in a sample. The formulation of the problem in this study is how much protein and fat levels are contained in the green kopek green eggplant kopeksangegg plant. The study was conducted to determine how many grams of protein and fat content in purple kopek eggplant and green kopek eggplant samples. With a spectrophotometric method (Lowry) for the determination of protein content and one method of hot extraction is the soxhletation method for the determination of fat content. The results showed that the protein content in 50 g of eggplant purple kopek was 0.0323 g and 50 g eggplant green kopek was 0.0375 g. The fat content in 10 grams of eggplant purple kopek is 0.1794% and 10 grams of eggplant green kopek is 0.1612%. Based on the results of the research that has been carried out, it was found that the protein content of eggplant kopek did not meet the DKBM standard, namely 1.4-2 g in a sample of 100 g. While the standard fat content obtained by DKBM is 1.1 g in a sample of 100 g.

Page 2 of 4 | Total Record : 31

 1   2   3   4 

Filter by Year

2021 2024


Reset
Filter By Issues
All Issue Vol. 41 No. 1 (2024): Mathematics and natural science Vol. 4 No. 1 (2024): Marc: Mathematics and natural science Vol. 3 No. 1 (2023): March: Mathematics and natural science Vol. 2 No. 2 (2022): September : Mathematics and natural science Vol. 2 No. 1 (2022): March: Mathematics and natural science Vol. 1 No. 2 (2021): September: Mathematics and natural science Vol. 1 No. 1 (2021): March: Mathematics and natural science