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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 7 Documents
 1 
Search results for , issue "VOLUME 3, ISSUE 1, February 2022" : 7 Documents clear
Analysis of Hotels Spatial Clustering in Bali: Density-Based Spatial Clustering of Application Noise (DBSCAN) Algorithm Approach Achmad Fauzan; Afdelia Novianti; Raden Rara Mentari Ayu Ramadhani; Marcelinus Alfafisurya Setya Adhiwibawa
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.art4

Abstract

Bali is one of the hearts of tourism in Indonesia. The existence of the Covid-19 pandemic has made this tourist paradise also affected the wheels of the economy. Based on this, this study aims to determine the density clustering of one of the economic supporters in Bali, namely hospitality. The study began with the quadrant method and Ripley's K-Function to measure the distribution pattern of hospitality. From the results of the two methods, the distribution pattern of hotels in Bali is more towards clusters than random or regular distribution. If the point distribution pattern is more towards the cluster, it is continued with the Density-Based Spatial Clustering of Application Noise (DBSCAN) algorithm to form spatial clustering. In the DBSCAN algorithm, a combination of parameters, namely minimum points (MinPts) and epsilon (Eps), is carried out with evaluation using the silhouette average width value. From the results of the DBSCAN algorithm, the clustering results show that the distribution of hotels in Bali forms clusters and tends to approach the surrounding tourist attractions, such as near the beach, city market, and mountainous areas. It can help policymakers if they want to prioritize economic recovery after the Covid-19 pandemic.
Validation Method on Green Analysis of Nitrite in Domestic Wastewater Yuli Rohyami; Lutfiana Aida Rahmah; Endah Iniati
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.art1

Abstract

The development and validation of methods on green analysis of nitrite in domestic wastewater has been carried out. This study is focused on the development and validation of nitrite determination using a smaller sample size with test kit nitrite from phosphoric acid, acid sulfanilamide, and N-(-naphthyl)-ethylenediamine dihydrochloride. The validation parameters studied include linearity, the limit of detection, the limit of quantification, precision, accuracy, and uncertainty. Based on the study, the green analysis procedure has good linearity with the linear regression equation of y = 2.8405x + 0.0043 with the correlation coefficient of 0.9992. Green analysis can be used detection and quantification nitrite in domestic wastewater at low concentration levels with the limit of detection of 0.01 mg/L and the limit of quantification of 0.03 mg/L. This green analysis procedure has good precision and accuracy with a % RSD of 1.61% and % recovery of 109.61%. Based on the study, the determination of nitrite with the green analysis method in domestic wastewater can be used at low concentration levels. The concentration of nitrite is 0.05 + 0.01 mg/L for inlet sample and 0.04 + 0.01 mg/L for outlet sample
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.
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

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