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EKSAKTA: Berkala Ilmiah Bidang MIPA
ISSN : 25497464     EISSN : 14113724     DOI : -
EKSAKTA Berkala Ilmiah Bidang MIPA is an open access journal and peer-reviewed that publishes either original article or reviews. The journal is dedicated towards dissemination of knowledge related to the advancement in scientific research. The prestigious interdisciplinary editorial board reflects the diversity of subjects covered in this journal. Under the realm of science and technology, the coverage includes environmental science, pure and applied mathematics, agricultural research and engineering, biology, biotechnology, bioinformatics, Healthcare sciences (including clinical medicine, preventive medicine & public health), physics, biophysics, computer science, chemistry and bioengineering, to name a few. This Journal Is Published at 6 Month intervals On April and October.
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Articles 70 Documents
The Response of Jabon Seeds Germination (Anthocephalus cadamba (Roxb.)Miq.) against the Duration of Combustion and Illumination Vauzia, Vauzia; Gusmira, Eliza
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol 19 No 2 (2018): EKSAKTA Berkala Ilmiah Bidang MIPA
Publisher : Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (806.11 KB) | DOI: 10.24036/eksakta/vol19-iss2/154

Abstract

The purpose of this research is to know the response of jabon seeds germination against combustion and ilumination. The design that is used is RAL with 2 factors in it. The first is from the duration of combustion and the second is from the illumination treatment. Based on the design, there are 10 combination of treatments and every treatment will be done 3 times so there will be 30 experiments for the total. The parameter that is observed is the duration of jabon seed germinating and the length of jabon’s root. The result of this research showed that the combustion factor, the illumination factor, and the interaction between combustion and illumination is mattered to the duration of jabon seed germinating. While the length of jabon’s root depends with the combustion factor and the illumination factor. The interaction between the duration of combustion and illumination will not affect the length of jabon’s root at all.
Fenthion Compound Degradation in the Pesticide Bayleton 500 ec in Sonolysis, Ozonolysis and Sonozolysis with Addition of TiO2-anatase Sofyanita, Sofyanita; Octaria, Zona
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol 19 No 2 (2018): EKSAKTA Berkala Ilmiah Bidang MIPA
Publisher : Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (870.379 KB) | DOI: 10.24036/eksakta/vol19-iss2/153

Abstract

Fenthion an active compound contained in EC 500 lebaycid pesticides that are toxic. To reduce the level of toxicity will be degradation in sonolysis, ozonolysis and sonozolysis with the addition of TiO2-anatase. Degradation results in sonolysis, ozonolysis and sonozolysis measured by UV-Vis spectrophotometer at wavelength of 400-600 nm. From the research that has been made degradation result fenthion 6 mg/L in sonolysis without addition of catalyst of 37.5% and with the addition of TiO2-anatase catalyst obtained for 65.12% of degradation for 60 minutes. In ozonolysis at the same time obtained percent degradation of 39.77% without the addition of catalyst and 81% with the addition of TiO2-anatase catalyst. Percent degradation fenthion compound without the addition of TiO2-anatase catalyst after a 60-minute sonozolysis obtained at 91.7%.
Some Operations on Mixed Monotone Operator in Banach Spaces Badrulfalah, Badrulfalah; Irianingsih, I; Joebaedi, Khafsah
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol 19 No 2 (2018): EKSAKTA Berkala Ilmiah Bidang MIPA
Publisher : Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (913.289 KB) | DOI: 10.24036/eksakta/vol19-iss2/150

Abstract

This paper discusses some operations on mixed monotone operator in Banach space, especially addition an multiplication operations. We will prove the sum and product of two mixed monotone operators. The proof using some relevant definitions. The result is the sum o of them is a mixed monotone operator and the product is  too if both  satisfy some conditions
First Order Space Time Autoregressive Stationary Model on Petroleum Data Joebaedi, Khafsah; Parmikanti, K; Badrulfalah, Badrulfalah
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol 19 No 2 (2018): EKSAKTA Berkala Ilmiah Bidang MIPA
Publisher : Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1181.149 KB) | DOI: 10.24036/eksakta/vol19-iss2/152

Abstract

First order Space-Time Autoregressive model is one of the models which involves location and time. STAR(1;1) model stationary can be used to forecast future observation at a location based on one previous time of its own location and the spatial neighborhood. STAR(1;1) model on petroleum productivity data in Balongan, Indramayu, West Java with eigenvalue less than 1. It indicates that STAR (1;1) model on petroleum productivity data in Balongan, Indramayu, West Java meets the stationary requirement
Analysis of Heavy Metals Distribution in the River Town of Hamasaki's Rod Padangsidimpuan Harahap, Fatma Suryani; Lubis, Laila Tussifah
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol 19 No 2 (2018): EKSAKTA Berkala Ilmiah Bidang MIPA
Publisher : Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (731.553 KB) | DOI: 10.24036/eksakta/vol19-iss2/149

Abstract

Systems of waste management in Padangsidimpuan City is an open dumping system. The location of the Padangsidimpuan City landfill is carried out at the Batu Bola TPA located in Batu Bola Village which is 120 meters from the Batang Ayumi river flow. Continuous landfill in the landfill produces pollutants in the form of leachate. Leachate contains organic materials and heavy metals. Heavy metals that are often found in leachate water are Iron (Fe) cadmium (Cd) and Zinc (Zn). This research aims to know the quality of the water of the Batang Ayumi river in terms of the content of heavy metals Cd, Zn, and Fe. This research uses descriptive exploratory method by conducting a survey first. The determination of the sampling location using purposive sampling method at four stations specified. River water sampling is carried out twice, before and after rain. This research uses an Atomic Absorption Spectrophotometer tool. The data obtained were analyzed by comparing research data with water quality standards based on PP. No. 82 of 2001 to look at the conditions of the heavy metal pollution of Cd, Zn and Fe. The results of this study showed that the average concentration of the metal content Cd, Zn and Fe werw below the specified quality threshold, namely the concentration of metal Cd of all stations is 0.0009 mg/l, a concentration of metal Fe is 0.03 mg/l, and concentration of Zn metal is 0.0002 mg/l.
Factor Analysis of Physics Chemistry Waters that Affects Damage Safety Cliff on the Outskirts of River Siak Dinata, Marta; Soehardi, Fitridawati
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol 19 No 2 (2018): EKSAKTA Berkala Ilmiah Bidang MIPA
Publisher : Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (824.228 KB) | DOI: 10.24036/eksakta/vol19-iss2/143

Abstract

ABSTRAK: Penelitian ini untuk mengidentifikasi faktor fisika kimia air yang vegetasi tumbuhan di pinggiran Sungai Siak ditinjau dari kualitas air sungai siak baik secara kimia, fisika dan biologi serta kondisi erosi pada tebing sungai siak baik yang menggunakan pengaman tebing maupun yang masih dalam kondisi asli. Penelitian ini adalah penelitian deskriptif kondisi vegetasi tumbuhan sungai dan kerusakan pengaman tebing di pingir sungai siak. Data yang diperlukan adalah data diperoleh hasil pengukuran kualitas air baik dari segi fisika, kimia dan Biologi yaitu oksigen terlarut, CO2 bebas, pH air, kecepatan arus sungai, pengambilan sampel air untuk pengukuran Total Suspended Solid serta pengukuran suhu air dan BOD5. Data curah hujan diperlukan untuk menghitung intensitas hujan dan perkiraan debit banjir pada sungai siak yang terjadi, dan Data kondisi Pengaman Tebing dipinggiran Sungai Siak. Kemudian dianalisis sehingga menghasilkan data yang dapat mengidentifikasi faktor fisika kimia perairan yang mempengaruhi vegetasi tumbuhan di pingir sungai siak. Hasil dari penelitian teridentifikasi faktor fisika kimia perairan yang mempengaruhi vegetasi tumbuhan dan kerusakan dinding penahan tanah di pinggiran sungai siak (studi kasus Kecamatan Tualang Kabupaten siak) terdapat minyak lemak disetiap stasiun pengamatan dengan kandungan Sulfat kategori tinggi yang berkisar 239,50-341,87 mg/L. diikuti oleh kandungan Klhorida 14,0-24,4 mg/L, Phospat 5,31-5,83 mg/L. Bahan-bahan kimia yang terkandung dalam perairan ini membuat percepatan kerusakan dinding penahan tanah pinggiran sungai dengan semakin meningkatnya jumlah bahan kimia ini setiap mg/L nya. Dengan nilai pH yang berkisar 6,1-6,8 dengan tambahan kandungan tembaga dan timbal yang terkandung dalam kualitas air membuat jenis vegetasi yang mendominasi daerah penelitian ini yaitu family dari Lythraceae dan Combretaceae yang rata-rata adalah jenis bakau yang membutuhkan phospat tinggi. Dengan banyaknya vegetasi jenis ini mendominasi pinggiran sungai, menyebabkan dinding pengaman tebing pinggiran sungai hancur oleh akar udara yang menjalar.
Mitigation of Land Movement using Self Potential Method in Ling-Anjung Region Sumedang Regency Santoso, Budy; Setianto, Setianto; Hasanah, M U; Wijatmoko, B; Supriyana, E; Mohammad, H
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol 19 No 2 (2018): EKSAKTA Berkala Ilmiah Bidang MIPA
Publisher : Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1216.37 KB) | DOI: 10.24036/eksakta/vol19-iss2/141

Abstract

Land movement occurs due to reduced soil strength which is affected by water pressure. The Self Potential (SP) method is a geoelectric method that can detect well the flow of groundwater. The Self Potential method can also be used to detect the presence of debris flow  in the form of weathered soil, tuff sand, cobble gravel and other rock fragments that have mixed with water. Based on the results of the SP measurement, debris flow has a medium SP with a value (3 - 12) mV, rock that has shifted (sandstone associated with andesite fragment) has a SP value <  2mV, while water seepage and water flow has an SP value (13 - 36) mV.
Analysis Cracking Corrosion on Carbon Steel Pipes API 5L-X65 In Solution 7700 ml Aquades, 250 ml Acetic Acid and 50 ml Ammonia with Gas CO2 and H2S in Saturation Condition Syafei, Nendi Suhendi; Hidayat, Darmawan; Emilliano, Emilliano; Men, Liu Kin
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol 19 No 2 (2018): EKSAKTA Berkala Ilmiah Bidang MIPA
Publisher : Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1060.336 KB) | DOI: 10.24036/eksakta/vol19-iss2/138

Abstract

The oil and gas industry exploration that will generally be followed by corrosive substances including sweet gas (eg H2S and CO2), it will result in corrosion event. The corrosion stress cracking will cause the carbon steel pipe to break so that production oil and gas can be stopped. The research aims in this paper is to analyze the corrosion event of carbon steel pipe in laboratory scale on acid environment with the existence of sweet gas H2O and CO2 by using three points loading method. This research uses carbon steel pipe API 5L-X65 which stay in condensation environment of 7700 ml aquades, 250 ml acetic acid and 50 ml ammonia, then filled sweet gas CO2 and H2S in saturated state. Based on the test results of microstructure and microscope polarized, there is a phenomenon corrosion stress cracking, i.e transgranular stress cracking corrosion and intergranular stress cracking corrosion. The accelerate corrosion that happened at the test sample will be greater if ever greater given deflection for the time of the same presentation. Crack deepness in the test of the test sample will deeper if ever greater given deflection. The cracks in the sample test will deeper if it was given stress σ greater for the same exposure time.
DIAGONALISASI BENTUK KUADRATIK IRISAN KERUCUT Rizal, Yusmet
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol 19 No 1 (2018): EKSAKTA Berkala Ilmiah Bidang MIPA
Publisher : Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (722.322 KB) | DOI: 10.24036/eksakta/vol19-iss1/132

Abstract

In general, the conic section equation consists of three parts, namely quadratic, cross-product, and linear terms. A conic sections will be easily determined by its shape if it does not contain cross-product term, otherwise it is difficult to determine. Analytically a cone slice is a quadratic form of equation. A concept in linear algebraic discussion can be applied to facilitate the discovery of a shape of a conic section. The process of diagonalization can transform a quadratic form into another form which does not contain crosslinking tribes, ie by diagonalizing the quadrate portion. Hence this paper presents the application of an algebraic concept to find a form of conic sections.
Analysis of Nepenthes Hybrids in Taratak Hill, Pesisir Selatan Sumatera Barat by RAPD Technique Enjelina, Weni; Mansyurdin, Mansyurdin; Meideliza, Tesri
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol 19 No 2 (2018): EKSAKTA Berkala Ilmiah Bidang MIPA
Publisher : Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (866.409 KB) | DOI: 10.24036/eksakta/vol19-iss2/137

Abstract

The Study about Analysis of Nepenthes Hybrids in Taratak Hill, Pesisir Selatan Sumatera Barat by RAPD Technique had been conducted from May until November 2011. The study was done to prove natural hybrids of Nepenthes by RAPD technique and to determine the relationship of natural hybrids of Nepenthes with both parental. The research method is survey and observation. Isolation of DNA carried by CTAB method with modifications and amplification carried out by PCR. Hybrids and parental relationship was obtained from Jaccard similarity coefficient and displayed in a Dendogram (family tree) and PCO analysis to look genetic variation was processed with the program PAST 2.10. Proof of the natural hybrid N. ampullaria × N. mirabilis can be done by the RAPD technique using the primers OPA 15, OPK 16, OPK 19 and OPP 15. Natural hybrids between N. ampullaria × N. gracilis using the primers OPA 15, OPK 19 and OPP 15. The eighth of natural hybrids N. ampullaria × N. mirabilis were closer to N. mirabilis, while both natural hybrids N. ampullaria × N. gracilis closer to the N. Ampullaria.