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INDONESIA
EKSAKTA: Journal of Sciences and Data Analysis
Published by Universitas Islam Indonesia
ISSN : 27160459     EISSN : 27209326     DOI : 10.20885
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Materials Science & Nanotechnology
Ekstakta is an interdisciplinary journal with the scope of mathematics and natural sciences that is published by Fakultas MIPA Universitas Islam Indonesia. All submitted papers should describe original, innovatory research, and modelling research indicating their basic idea for potential applications. The Journal particularly welcomes submissions that focus on the progress in the field of mathematics, statistics, chemistry, physics, biology and pharmaceutical sciences.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 231 Documents
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Influence of Mixing Time and Mass Ratio of Precursor on Preparation of Magnetic Biochar Derived from Cassava Peel (Manihot utilissima) Argo Khoirul Anas; Rosyida Mutiara; Muhammad Miqdam Musawwa; Agus Taftazani
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 3, ISSUE 1, February 2022
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol3.iss1.art2

Abstract

The use of magnetic biochar to overcome aquatic environmental problem has received interesting attention in recent years. Several methods in preparing magnetic biochar have been applied including impregnation-pyrolysis, chemical co-precipitation, and reductive co-precipitation. In case of co-precipitation method, the obtained magnetic biochar is relatively stable and easy to handle, that make it important to study. The purpose of this work is to study the influence of mixing time and mass ratio of precursor on preparation of magnetic biochar using this method. The cassava peel (Manihot utilissima) was used as feedstock for biochar preparation. The magnetic biochar which is characterised using FTIR, XRD, and SEM-EDX analysis was successfully prepared and applied as an adsorbent for MB. The optimum mixing time of precursor was identified at 60 minutes and maximum mass ratio was achieved at 1:1 of biochar:Fe3O4. Importantly, it can be known that MB adsorption successfully improved with the increase of mixing time, up to the optimum adsorption capacity at 60 minutes of precursor mixing time. Furthermore, at the mass ratio of 1:1 magnetic biochar displayed the highest adsorption capacity. The parameter in preparation method developed in this work can be used as an additional information in the magnetic biochar preparation
Preparation of Low-cost Adsorbent Based on Mango Leaf (Mangefira Indica L) Biomass for Methylene Blue (MB) Adsorption Muhammad Miqdam Musawwa; Annisa Fajriati; Imam Sahroni; Ahmad Said
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 3, ISSUE 1, February 2022
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol3.iss1.art3

Abstract

Preparation of leaf mango (Mangefira Indica L)-based adsorbent and its evaluation to reduce methylene blue (MB) concentration have been conducted. Two materials: ads-pristine and ads-CTAB which are referred as native leaf mango adsorbent and CTAB modified leaf mango have been prepared in this study. Cetyltrimethylammonium bromide (CTAB) is cationic surfactant usually used to modify and increase the surface area of the adsorbent for a specific purpose. The materials obtained were characterized by the Fourier Transform Infra-Red (FTIR) and the Scanning Electron Microscope (SEM) with general result, there were detected functional groups indicated the active sites on the adsorbent such as -OH, C-O, C=C. Ads-CTAB was specifically characterized with appearing of C-H aliphatic as the tail of CTAB molecule. SEM images show that both materials have roughness surface and irregular cavities. Additional of CTAB on the surface led the more regularly surface. The optimum pH was in basic region (8), while the optimum adsorbent mass and MB concentration are not clearly found due to the chart still increasing. However, the highest qe was found by 0.01 g of ads-pristine and ads-CTAB with the value 967.25 and 950.75 mg g-1 respectively. As the further evaluation, with the 0.5 adsorbent mass it may be applicated on the MB concentration at around 4000 mg L-1. Kinetics model of this adsorption was followed pseudo second order reactions.
The Encapsulation Process of Flavonoid from Kepel Seeds (Stelechocarpus burahol) Umi Rofiqah; Diora Ananda; Ilhamy Nurrahmah
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 2, ISSUE 2, August 2021
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol2.iss2.art9

Abstract

Flavonoid contained in Kepel seeds was extracted and encapsulated using a crosslinker agent of natrium tripolyphosphate (NaTTP) aiming for protection of the flavonoid content as an antioxidant. Extraction was carried out in variation of ethanol concentration and time extraction to obtain the best extract flavonoid. Fourier Transform Infrared Spectrometry (FT-IR) method was used to determine the presence of flavonoids in the extract. Total flavonoids (TF) analysis was carried out using a UV-Vis spectrophotometer. The highest total flavonoid content was obtained in the extract with 50% ethanol concentration was 2.427% for one hour and 2.888% for two hours.
Effect of Virgin Coconut Oil from Green Coconut on High-Density Lipoprotein (HDL) Levels in Blood Serum of White Mice Iswendi Iswendi; Iryani Iryani; Regi Fadila Putra
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 2, ISSUE 2, August 2021
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol2.iss2.art10

Abstract

This study aims to determine the effect of High-Density Lipoprotein (VCO) dose on mice's blood serum High-Density Lipoprotein (HDL) levels. This study is an experimental study using 24 mice divided into four groups. Control (-), Control (+) were fed egg yolks 0.025 mL/g body weight, Dose 0.02 and Dose 0.025 were experimental groups, given egg yolks 0.025 mL/g mice body weight and VCO at a dose of 0.020 mL, and 0.025 mL/g body weight of mice. HDL levels were determined on days 7, 14, and 21 by enzymatic method using 20 D* spectrophotometry. The statistical test found that the length of time giving VCO significantly affected blood serum HDL levels in mice with Fcount > Ftable (Fcount = 7.128 and Ftable = 5.14). In contrast, variations in VCO dose did not significantly affect blood serum HDL levels. mice with Fcount < Ftable (Fcount = 3.33 and Ftable = 4.76). The highest HDL level was at a dose of 0.020 mL/g body weight of mice with a treatment period of 14 days, namely 164,033 mg/dL of blood.
Multi Criteria Decision Making Using Normalized 3 – Polar ELECTRE I and Fuzzy 3 – Polar Dombi Arithmatic AOs (Case Study of Determining Manufacture Location) Ricky Haryanto; Sugiyarto Surono
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 3, ISSUE 1, February 2022
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol3.iss1.art5

Abstract

The m-Polar fuzzy set is a set that not only overcomes data ambiguity, but can also handle multi-polar, multi-attribute, and multi-criteria information. The m-Polar fuzzy set is useful in describing uncertainty in multi-attribute decision-making. One of the techniques used in decision-making is the ELECTRE I method. The ELECTRE I method plays a role in conducting pairwise comparisons between alternatives given by the decision-maker, where alternatives, criteria, and weights are given by the decision-maker. Furthermore, the ranking results from the ELECTRE I method will be compared with the mF Dombi Weighted Averaging (m-FDWA) aggregation operator with the help of the arithmetic operator. The purpose of this study was to compare the ranking results of the mF ELECTRE I, and the normalized and non-normalized m-FDWA arithmatic methods. The data used is secondary data related to site selection for global manufacturing with 20 alternative countries (country) and 8 criteria. The results showed that the best alternative to the normalized mF ELECTRE I and m-FDWA methods was country 14. While the m-FDWA arithmetic method without normalization resulted in country 3 as the best alternative. The effectiveness test was applied to m-FDWA arithmetic method, both normalized and without normalization to test the validity of the model so that it can be seen that normalization does not affect the validity of the model.
Routine Blood Profiles of Global Ischemic Rats Based on Ischemia Durations Rika Yulita Rahmawati; Utami Mulyaningrum; Ety Sari Handayani
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 3, ISSUE 1, February 2022
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol3.iss1.art6

Abstract

Stroke is the third cause of death and the first cause of disability in the world. It is around 80% of stroke patients in the world are ischemic stroke. According to the development of stroke models in animals, BCCAO is one technique that can induce global cerebral ischemia. An ischemia is known to influence activities of inflammatory cells which can be measured through peripheral blood. This study aims to determine effects of ischemia duration on routine blood profiles of rats (Rattus norvegicus) after bilateral common carotid artery occlusion (BCCAO). This study was a quasi-experimental study. Its subjects were adult Wistar rats (Rattus norvegicus). The rats were grouped into four treatment groups, and each group consisted of 6 rats. Group A was a group of sham-operated rats, group B was a group of rats with ischemia duration for 5 minutes, group C was a group of rats with ischemia duration for 10 minutes, and group D was a group of rats with ischemia duration for 20 minutes. Its obtained data were analysed by one-way ANOVA test and Post Hoc Tamhane's test. The ischemia duration significantly influenced the neutrophil and lymphocyte count after ischemia, with p < 0.05. The ischemia duration could affect the routine blood profiles of the rats after BCCAO, especially the neutrophil and lymphocyte count.
The Effect of Subchronic Administration of Soursop (Annona muricata) Leaf Aqueous Extract In Bax Expression on Gastric Glandular and Non Glandular Mucosal Epithelium of Rat (Rattus norvegicus) Ety Sari Handayani; Zainuri Sabta Nugraha; Chandra Muhammad Rauf; Yusa Muhammad Thoriq; Nurul Hidayah
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 3, ISSUE 1, February 2022
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol3.iss1.art7

Abstract

Soursop leaf water extract (SLWE) contains acetogenin compounds which are mitochondrial complex I inhibitors. This compound can reduce cellular ATP production and induce apoptosis via bax pathways, causing side effects on cells. Gaster is a digestive organ that has direct contact with acetogenin. Gastric cells contain mitochondria and undergo physiological apoptosis.This study aims to determine the effect of subchronic administration of SLWE on bax expression on glandular/non glandular mucosal epithelium gastric of rats. This study was conducted at Research Laboratorium, Medical Faculty, UII, 2019. This study uses post test only control group design. The subjects were 10 female rats, Spraque-dawley strain which was divided into 2 groups; the treatment and the control group. The treatment group received extract of SLWE at a dose of 1000 mg/kgBB/day for 30 days, while the control group received aquades, both were administered using sonde. Observation of bax expression was performed on each IHC preparation with bax antibody. The difference in bax expression between the control and treatment groups was tested by t-test. There were significant differences in the number of bax expressions in gastric glandular mucosa (p 0.038) and non-glandular gastric mucosa (p 0.027) between the treatment group and the control group. There was an effect of subchronic administration of SLWE on bax expression on mucosalepithelium for both, glandular and non-glandular of rat gaster. There were differences in the number of glandular gastric as well as non-glandular gastric mucosa epithelium which exerted bax between the control and treatment groups
Identification of Elemental Content and Rock Types in West Lampung Regency Nadya Fitra Kurnia; Hamdi Rifai; Syafriani Syafriani; Letmi Dwiridal; Fatni Mufit
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 3, ISSUE 2, August 2022
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol3.iss2.art1

Abstract

Rock is a constituent of the earth's crust from a collection of minerals that harden due to natural processes. Rocks formed from volcanic eruption materials in each place have different characteristics in distribution patterns, types of minerals and the content of elements contained therein. These rocks contain elements that form magnetic minerals. However, in rocks in West Lampung Regency the elemental content in the rocks has not been identified. This study aims to determine the composition of rock-forming elements and rock types found in West Lampung Regency. The elemental content in rocks can be identified using X- Ray Fluorescence (XRF) and determine rock types using SiO2and K2O diagrams. The results of the analysis using XRF show that Si (Silica) is the most dominant element found in 4 rocks in Lampung Regency. West. In addition, the elements found in rocks in West Lampung are Al, Si, K, Ca, Fe, P, Cl, Ti, Mn, Ni, Cu, Zn, Ga, As, Rb, Sr, Y, Zr, Ag, In, Eu, and Pb , from the content of these elements there are elements that form magnetic minerals, namely Fe and Ti , with rock types of Foidite and Decite.
Penerapan K-Means untuk Clustering Berdasarkan Tingkat Keparahan COVID-19 di Rumah Sakit Swasta Indonesia: Penerapan K-Means untuk Clustering Berdasarkan Tingkat Keparahan COVID-19 Kathina Deswiaqsa; Endang Darmawan; Sugiyarto Sugiyarto
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 3, ISSUE 2, August 2022
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol3.iss2.art5

Abstract

In December 2019, coronavirus (COVID-19) caused by SARS-CoV-2 was first discovered in Wuhan, China. This virus has a high transmission rate and can be transmitted through droplets, airborne, and aerosols. The clinical manifestations are very diverse ranging from mild, moderate, and severe. Therefore, this study aims to conduct a clustering of the spread of the Covid-19 pandemic to facilitate the identification and handling. The method of the K-Means algorithm can be used as a method to obtain the desired clustering. The implementation and evaluation were conducted using RapidMiner tools and Davies Bouldin Index (DBI) respectively. Furthermore, the data sources by Kangdra (2020) were used with a total sample of 110 for the period March-June 2020. The results showed that the optimal cluster is located at k: 2 with a DBI value: 0,094 as the lowest value. Therefore, the cluster is strong since a smaller DBI value gives a better cluster. The clustering obtained is Cluster 1 and 2 with mild and moderate severity. The results are expected to facilitate a better zone identification of the COVID-19 severity level and rising people awareness.
Clustering of PDQ Participant Student in Faculty of Mathematics and Natural Sciences UII using the ROCK Method Rahmadi Yotenka; sekti kartika dini
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 3, ISSUE 2, August 2022
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol3.iss2.art7

Abstract

The Qur’anic Self-Development (PDQ)-Ta'lim Program is one of the student activities that must be followed by diploma and bachelor program students in Universitas Islam Indonesia (UII). The implementation of PDQ is coordinated by each faculty which is carried out for 4 semesters with 12 meetings for each semester. After carrying out PDQ activities, it is necessary to know the student profiles that can be used as the basis for policy making in the implementation of PDQ activities in the next period. In order to find out the profile of students after participating in PDQ activities, it is necessary to group these students based on related variables. This study uses the ROCK method to group students participating in the PDQ Faculty of Mathematics and Natural Sciences (FMIPA) UII batch 2020. The ROCK method is a robust agglomerative hierarchical-clustering algorithm based on the notion of links. The ROCK method is a suitable clustering method for grouping data with categorical variables. Based on the results of the analysis of the ROCK method of student data for the batch 2020 FMIPA UII, obtained three optimum clusters (k=3) at a threshold value of θ of 0.20. Threshold 0.20 has the smallest SW/SB ratio value of 0.0514 or 5.14% and the largest R-squared value is 61.76% compared to other thresholds.

Page 18 of 24 | Total Record : 231

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