Indonesia Conference Directory

Corresponding Author
Rian Rahmansyah

Institutions
(a*)Post Graduate School Department of Chemistry, Faculty of Mathematics and Natural Science, State University of Medan (UNIMED)
(b)Lecturer Department of Chemistry, Faculty of Mathematics and Natural Science, State University of Medan (UNIMED)

Abstract
This research uses the Research & Development (R&D) method with quantitative and qualitative approaches conducted in schools. This research aims to develop Edmodo media in the field of science, find out the feasibility of using media, find out the response of users in using the media. Based on the feasibilitys testing of the media and the field of science conducted by 2 material expert validators and 1 media expert validator it was found that Edmodo media developed according to experts was declared feasible and could be used as a learning medium in the field of science.

Keywords
Edmodo, Media , Research & Development , Science

Topic
Multimedia and Technology Information

Link: https://ifory.id/abstract/4aBgvqEXx3yr

Corresponding Author
Murniaty Simorangkir

Institutions
a) Department of Chemistry, Universitas Negeri Medan, Medan 20221, Indonesia
*murniatysimorangkir[at]unimed.ac.id

Abstract
Sarang banua plants are found in Simalungun, North Sumatra, Indonesia, which have been used by the community as traditional medicinal plants and is a type of Clerodendrum fragrans Vent Willd, including the family Verbenaceae. The study design was a completely randomized design (CRD) with five treatments namely 1% Na-CMC solution (K1, negative control), bovine serum antigen (K2), ethanol extract of sarang banua leaf 200 mg/kg BW (K3), ethanol extract of sarang banua leaf 200 mg/Kg BW with bovine serum antigen (K4) and ethanol extract of sarang banua leaf 150 mg/Kg BW with bovine serum antigen (K5). The results showed that administration of ethanol extract of sarang banua leaf (Clerodendrum fragrans Vent Willd) significantly affected serum globulin levels of rabbits (Oryctolagus cuniculus). The ethanol extract of sarang banua leaves 200 mg/kg BW with bovine serum antigen (K4) produced the highest serum globulin levels of rabbits (12.91 mg/mL).

Keywords
Sarang banua (Clerodenrum fragrans Vent Willd); leaf ethanol extract; globulin Rabbit serum

Topic
Biochemistry, Biotechnology and Pharmacy

Link: https://ifory.id/abstract/RZEqjVBfdrzK

Corresponding Author
Lucky Darmawan

Institutions
Universitas Indonesia

Abstract
In this paper, we report magnetic and microwave absorbing properties of magnetic based nanocomposites, which synthesized through mechanically alloyed the magnetic crystalline powders. The first component of composite was Mn andTi doped Barium hexaferrite (BaFe12O19) or BHF obtained through a mechanical alloying process which was mixed with the second component of mechanically alloyed the CoFe2O4 magnetic compound to form composites of [Ba (Fe, Mn, Ti) 12O19]1-x/[CoFe2O4] x (x = 0.2; 0.5; 0.8) compositions. Prior to composite the two magnetic components, the remanence and saturation magnetization of the components were obtained optimally. Before Mn-Ti doping, the BHF has remanence (Mr) and saturation magnetization 0.206 T and 0.42 T respectively, with the corresponding coersivity (Hc) was 263.1 kA/m. On the other hand, CoFe2O4 (CFO) which has a high saturation magnetization (0.48 T) but with a low coersivity (16.22 kA/m). In form of magnetic composite, the high remanence was almost retained, but with the coercivity value decreased further to the lowest 80.82 kA/m. These two main properties (high remanence and low coercivity) were led the composite being good candidates for microwave absorbing materials. Microwave absorbing characteristics of [Ba(Fe,Mn,Ti)12O19]1-x/[CoFe2O4]x (x = 0.2; 0.5; 0.8) composites were discussed inthis paperin relation with their corresponding magnetic properties for designing the best microwave absorbing materials.

Keywords
Cobalt ferrite, Barium Hexaferrite, mechanically alloying, magnetic properties, microwaves absorbing material, nanocomposite magnet.

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/bZN7VLrcyaxq

Corresponding Author
Eddy Ibrahim

Institutions
a,b) Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Sriwijaya,
c) Jurusan Teknik Elektro, Fakultas Teknik, Universitas Sriwijaya,
Jl. Srijaya Negara Bukit Besar, Palembang, 30139, Indonesia ;
*eddyibrahim[at]ft.unsri.ac.id

Abstract
Volumetric method is one method of calculating oil and gas reserves in reservoirs that have been used in the oil industry to date. Data sources which become the main requirements in using this method are basic data such as log data, core rocks or side terraces, area estimates, Rf and fluid properties. This method is used to obtain a forecast of the remaining reserves of Well X for future use. Based on the data limitations in Well X there is only Logging (thickness) data whose range is between 650 m and 700 m, the recovery factor is assumed to be 100% and the area of distribution of wells in one block is 13 km2. From the results of calculations using the volumetric method, the remaining reserves in well X are 320,853.63 STB and the remaining natural gas is 1,801,539.11 SCF.

Keywords
Logging, Oil and Gas, Remaining Reserves, Recovery Factor, Volumetric Method

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/DAazFENHq3kw

Corresponding Author
Vera Permatasari

Institutions
a) Research Center for Testing Technology, Indonesian Institute of Science, PUSPIPTEK area Setu, Tangerang Selatan 15314 Indonesia
b) Biomedical Science, Medical Faculty, Sriwijaya University, Jl.Dr.Moh Ali, Komplek RSMH Palembang 30126 Indonesia

Abstract
Endometriosis is characterized by the growth of endometrial outside the uterine cavity, which is found in women with subfertility and pelvic pain problems. The development in reproductive age and the decrease after menopause or ovariectomy prove that endometriosis is an estrogen dependent disease. Effect of the estrogen hormone depends on the binding to its receptor. Estrogen receptor alpha (ERa) polymorphisms which admit by PvuII enzyme restriction has associate to some womens disease like endometriosis. This Study aimed to determine the correlation between ERa 397 T/C with the risk of endometriosis. This study is an analytical observational study with the case control design. There were 70 samples which were divided into 2 groups: 35 cases (endometriosis group) and 35 controls (non-endometriosis group). The determination of genotypes and allotypes used PCR-RFLP method and the data analysis by chi square test a<0,05.The results showed that genotype frequencies of case group are 11,4% TT, 54,3% TC and 12% CC while genotype of control group are 34,3% TT, 51,4% TC and 14,3% CC with p value 0,032. Allele frequencies of case group are 38,6% T and 61,4% C while control group are 60% T and 40% C with p value 0,011. Conclusion: there is a significant correlation between the genotype and allel polymorphism of ERa gene 397 T/C with the risk of endometriosis.

Keywords
Polymorphism; ERa; PvuII; Endometriosis

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/wvMe9hFVqnEa

Corresponding Author
Rajaramakrishna R

Institutions
(a) Department of Physic, B.G.S R&D Centre, SJC Institute of Technology, Chikkaballapur, Karnataka, India
(b) Department of PG studies and research in physics, The National College, Jayanagar, Bangalore - 560070
(c) Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom, 73000, Thailand
(d) Department of Physics, SDM Institute of Technology, Belathangady, Ujire, Karnataka, India - 574240
(e) Department of Physics, Brindavan College of Engineering, Bangalore,560063, India
*r.rajaramakrishna[at]gmail.com, **mink110[at]hotmail.com

Abstract
The glass systems with composition 20SrO-5CaO-40Li2O-(35-x) B2O3-x Eu2O3 (x = 0.3, 0.5 and 1 mol%) glasses were prepared by melt quenching technique to study absorption and luminescence properties and understand their lasing properties. The present work reports the studies on Physical, Optical and luminescence properties of the prepared glass systems. The photoluminescence (PL) intensity of the glass increases with increase in Eu2O3 content upto 1mol%. The increase in the density and decrease in molar volume reveals the close packing of glass network. For Eu3+ emission the most intense red emission has been observed at the wavelength of 614nm for the transitions 5D0 &

Keywords
Eu3+ ions, Photoluminescence, UV-Vis-NIR, Phonon side band, Lifetime.

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/Q8LmW36XRVDx

Corresponding Author
Rachmat Mulyana

Institutions
Jurusan Pendidikan Teknik Bangunan, Fakultas Teknik Universitas Negeri Medan

Abstract
Cases of injury or accident of construction workers are not entirely caused by negligence of the workers themselves, the atmosphere of construction management built by the contractors or developers also contributes to creating an atmosphere of comfort and security for construction workers. The purpose of this study is to evaluate the application of K3L procedures in the process of carrying out construction work by the constructor or developer. The study was conducted through 2 (two) surveys. The first survey was conducted to identify ongoing construction works projects in the Medan, Deli Serdang and Langkat areas. The second survey conducted an evaluation of the application of K3L to 8 contractors in 8 selected projects.Projects that have become the object of research consist of dam projects, hotels, water and sewage pump buildings, shopping buildings and industry. Analysis Evaluation of the implementation of K3L is used quantitative and qualitative descriptive methods. Worker Safety and Health each element is given a value which if "yes" has value (+1) and "no" value (0). This value results in frequency (number) and percentage that concludes the successful application of K3L in the project. Analysis of constraints in applying OHS to building construction projects is a factor causing imperfections in its application, using qualitative descriptive methods.The results showed that on average companies or contractors only applied 23 K3L items or 51% of all items that needed to be done or applied. The number of items in the aspect of K3L implementation applied by companies or contractors only ranges from 12 - 33 items (27% - 73%). This shows that the compliance level of the company or constructor is still low in implementing K3L and several construction works projects.

Keywords
K3L, Construction, Contractors, Workers, Projects

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/evHqkuYBDQcy

Corresponding Author
Tita Juwitaningsih

Institutions
a) Department of Chemistry, Universitas Negeri Medan, Medan 20221, Indonesia
* juwitaningsih[at]gmail.com

Abstract

Keywords
North Sumatera Cardamom Seed (Amomum compactum); Antibacterial; Breast anticancer (MCF-7)

Topic
Biochemistry, Biotechnology and Pharmacy

Link: https://ifory.id/abstract/HRjEFNVPJW4K

Corresponding Author
Asiah Ramadhani

Institutions
Postgraduate School Universitas Negeri Medan

Abstract
This research was conducted to produce an experimental video that is feasible and practical to use, to produce a scientific experiment video on heat transfer based on information technology. The development model used is an adaptation of the Borg & Gall model. The results of this study indicate the validation of material experts included in the feasible category, validation of media experts with very feasible categories, testing small groups with very practical categories and field trials with very practical categories.

Keywords
technological media, scientific approach

Topic
Multimedia and Technology Information

Link: https://ifory.id/abstract/CmcQkbzAw2Be

Corresponding Author
Fera Kurniadewi

Institutions
Chemistry Study Program, Universitas Negeri Jakarta, Jalan Rawamangun Muka, Jakarta 13220
*fera[at]unj.ac.id

Abstract
The Isolation and Purification of ethyl acetate fraction from Muntingia calabura leaves have resulted three flavonoid derivatives. UV-Vis, 1H-NMR dan 13C-NMR data showed that isolate compounds are 2,4-dihydroxychalcone (1), 3,7-dimetoxy-5-hydroxyflavon (2) and 3,5,7-trihydroxy-8-methoxyflavone (3). The antioxidant evaluation against 2,2-diphenyl-1-picrylhydrazyl (DPPH), compound (3), showed to be a very high activity (IC50 3,7 x109 ppm). The isolated compounds were also evaluated for their cytotoxic activities against murine leukemia P-388 cells resulted that all isolated compounds were inactive.

Keywords
Antioxidant, cytotoxic activity, flavonoid, Muntingia calabura

Topic
Biochemistry, Biotechnology and Pharmacy

Link: https://ifory.id/abstract/jkN4dqKrYQPC

Corresponding Author
Tumiur Gultom

Institutions
Lecturer of Biology Department, Mathematics and Natural Science Faculty, Universitas Negeri Medan Medan, North Sumatera, Indonesia
Graduated of Biology Department, Mathematics and Natural Science Faculty , Universitas Negeri Medan, Medan, North Sumatera, Indonesia
Researcher ,Research Center for Vegetables Crops,Tongkoh, Berastagi , North Sumatera, Indonesia

Abstract
This study aimed to determine the growth and production of Doulu Cultivar Garlic of MV2 generation. This research was conducted in March-July 2019. The seeds used in this study came from MV1 Garlic which given Gamma Rays at dose of 6 Gy (G3), 8 Gy (G4) dan 10 Gy (G5). Planting seeds in carried out in a research center for vegetables crops, Tongkoh, Berastagi, North Sumatera. The design used in this research is Non Factorial Randomized Block Design with 4 replications. This research uses 4 levels of treatment in accordance with the source of the seeds the dose 0 Gy (G0), 6 Gy (G3), 8 Gy (G4) dan 10 Gy (G5). The seeds came from 67 tubers consisting of 340 cloves. The parameters observed are age of growth, height of plant, number of leaves, number of stomata, diameter of stem, weight of cloves, diameter of cloves, and number of cloves. Data from this study were analysed with Anova and Least Significant Different test (LSD test). The results showed that the growth and production of plants significant of effect based on seed by radiation doses that are on height of plants, number of leaves, diameter of stem, weight of bulbs, diameter of bulbs, weight of cloves, diameter of cloves, structure of bulbs, and shape of bulbs of cultivar Doulu garlic but no significant on age of growth, number of stomata, and number of cloves.

Keywords
garlic, gamma ray radiation, MV2 generation

Topic
Biochemistry, Biotechnology and Pharmacy

Link: https://ifory.id/abstract/eRuHC6DqGTfQ

Corresponding Author
Fransiscus Benhardi Wastuwidya

Institutions
Civil Department, Universitas Indonesia, Depok, Indonesia

Abstract
Mining is one of the leading industrial sectors in Indonesia but has a negative impact on the environment. Acid mine drainage (AMD) is one of the negative impacts of mining activities that can cause environmental problems and require efficient and effective treatment. The development of acid mine drainage treatment involves the use of microalgae for remediation. The problem with the use of microalgae in AMD is the environmental conditions of AMD that limit the growth of microalgae where AMD has a high metal content, and low pH. This research was conducted to examine the adaptability of Botryococcus braunii microalgae on AMD media. The study was conducted on photobioreactors by varying the concentration of AAT at 25%, 50%, 75%, and 100% to assess the growth rate and removal efficiency of Fe and Mn metals as well as the pH increase in AMD. Botryococcus braunii is expected to be able to adapt gradually to the AMD media, so that AMD can become a growing medium for the microalgae. The output of this research is expected to be able to give an idea of the possible application of microalgae to biological AMD treatment.

Keywords
acid mine drainage, microalgae, mining, remediation

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/Ud2ejtkhKP64

Corresponding Author
Abba Suganda Girsang

Institutions
Bina Nusantara University

Abstract
Content based recommendation systems try to recommend items similar to those a given user has likely in the past, whereas systems designed according to the collaborative recommendation paradigm identify users whose preferences are similar to those of the given user and recommend items they have liked. The proposed recommendation system is discussing about Airbnb recommendations for a place in the city of Seattle. The selected process for the recommendation is calculating the rating of room types based on the environment. By calculating room types from several environments by combining two features namely room type and taken from the environment of the selected room type as well. The result of process and analysis will be provided into certain steps and images.

Keywords
recommendation, hotel, content

Topic
Big Data, Database System, Data Mining and Web Mining

Link: https://ifory.id/abstract/87nxdwaGbuV2

Corresponding Author
Abba Suganda Girsang

Institutions
Bina Nusantara Univerrsity

Abstract
The dynamics of a rapid development of a company now requires a balance of efforts in the field of utilization of human resources means that along with the development of the company the quality of human resources in the company should also be improved. As the executor of the transfer of civil servants, BKD is required for professionals in carrying out their duties in mutation positions for civil servants. This study implements a mutation system for civil servants by using Naive Bayes Classifier Algorithm. The data and system take Secretariat District Regency of Pelalawan. This system uses some attribute data such as age, total work Period, education background and implemented on a web based application. This approach is an approximation to Bayes theorem which is the principle of statistical opportunity to combine previous knowledge with new knowledge. This system is very effective classification algorithm (get the right results) and efficient which can be a basic reason in mutation civil servants.

Keywords
Civil Servant, Mutation, Algorithm Naive Bayes Classifier, Web.

Topic
Computer Applications and Information Sciences

Link: https://ifory.id/abstract/Qq9UXdKJfWrF

Corresponding Author
mislah sahila harahap

Institutions
(1 )Biology Education of Postgraduate school Universitas Negeri Medan, Jalan Willem Iskandar, Pasar V Medan Estate, North Sumatera 20221, Indonesia
(2)Departement of Biology, Faculty of Mathematics and Natural Science, Universitas Negeri Medan, Jalan Willem Iskandar, Pasar V, North Sumatera 20221, Indonesia *fauziyahharahap[at]gmail.com
(3)Departement of Biology, Faculty of Mathematics and Natural Science, Universitas Sumatera Utara, Jalan Bioteknologi No.1, North Sumatera 20155, Indonesia

Abstract
Orchids are plants that has aesthetic value and high economic important. Included in to ornamental plant whose existence is diminishing and endangered. Therefore, to preserve this plant it is necessary to plant one way through in vitro techniques. The aim of this study was to determine the best interaction of growth regulator Benzyl amino purine, coconut water and the interaction of both multiplication of Dendrobium sp. The research method used a completely randome design with various concentrations of Benzyl amino purine (BAP; 0,1,2,3 mg/L) and coconut water concentrations (0%,5%,10%). Were the observation parameter are number of shoots, leaves and roots. Data were analyzed descriptively and inferentially with ANOVA. The results shows the real effect of BAP interaction, between coconut water shoots and leaves, but did not significantly affect the number of roots. Within 12 weeks of observation the highest number of shoots and leaf obtained from a combination of 10% coconut water + BAP 3 mg/L were 12.00 and 5.00. The lowest number of shoots and leaves was obtained in combination of 5% coconut water + BAP 1 mg/L, 6.00 and 1.00.

Keywords
Benzyl amino purine, Coconut water, Dendrobium sp., In vitro

Topic
Biochemistry, Biotechnology and Pharmacy

Link: https://ifory.id/abstract/HvYTtdXD9jzR

Corresponding Author
YULIANA FERNANDO

Institutions
(1)Biology Education of Postgraduate School Universitas Negeri Medan, Jalan Willem Iskandar Pasar V Medan Estate, North Sumatera 20221, Indonesia.
(2)Department of Biology, Faculty of Mathematics and Natural Sciences Universitas Negeri Medan, Jalan Willem Iskandar Pasar V Medan Estate, North Sumatera 20221, Indonesia.
*fauziyahharahap[at]gmail.com
(3)Departement of Biology, Faculty of Mathematics and Natural Science, Universitas Sumatera utara, Jalan Bioteknology No.1, North Sumatera 20155, Indonesia

Abstract
Pineapple is a plant that needs to be developed on a plantation scale because the fruit has economic important. The research was conducted to determine the best media combination on the growth of pineapple from sipahutar In Vitro. The research used complete randomized design (CRD) factorial which is consisting of 12 treatments with 3 times repetitions. The parameters observed were number of shoots, leaves and roots. Data was analyzed by using ANOVA, and DMRT as follow up. The results showed addition of BA and vitamins have effect on propagation of pineapple shoots from sipahutar. The highest number of shoots was 8.00 shoots and 19.00 leaves produced MS + Vit 2 ppm + BA 2 ppm media. The highest root number of 3.67 produced MS + Vit 0 ppm + BA 0 ppm media.

Keywords
Benzyl Adenin, in vitro, Pineapple,Vitamin

Topic
Biochemistry, Biotechnology and Pharmacy

Link: https://ifory.id/abstract/Kg2vwjbADTJ8

Corresponding Author
Hidayati Wijaya

Institutions
Postgraduate Physics Education Study Program UNIMED

Abstract
Abstract. The purpose of this article is to find out the integration of physics concepts in Javanese culture. Physics is very closely related to daily life. In the daily life of Javanese culture there are many concepts related to physics. The environment of traditional Javanese society always believes in ancestral messages and customs about how to behave and apply to nature. Various problem solving continues to be associated with science and technology for the growth, development and welfare of human life. In this universe, everything can be explained with the help of science, especially physics. One distinctive feature of Javanese cultures local wisdom is batik making which applies the concept of capillary physics.

Keywords
-

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/fvYdjgtPmpDy

Corresponding Author
Letti Nainggolan

Institutions
1) Postgraduate Program, Department of Biology Education, Medan State University, Jl. Williem Iskandar, Pasar V, Medan, North Sumatera 20221, Indonesia.
*lettienainggolan[at]gmail.com
2) Department of Biology Education, Medan State University, Jl. Williem Iskandar, Pasar V, Medan, North Sumatera 20221, Indonesia.

Abstract
Nepenthes sp. is a carnivorous plant with unique shape and color shades. This unique plant has a special leaf modification called a pitcher which has the capability in catching insects and small animals. The purpose of this research was to know the types and habitat of Nepenthes sp. found in six districts in North Sumatera. The pitcher plants inventoried from South Tapanuli, Central Tapanuli, Humbanghasundutan, Toba Samosir, Dairi and Samosir districts in North Sumatera. The research type and method were conducted by descriptive qualitative and survey method research with a purposive sampling technique. The morphology data of Nepenthes sp. used to identify the types of Nepenthes sp. in North Sumatera. Inventory result of Nepenthes sp. from six districts showed that there were five original species in Sumatera Utara namely Nepenthes tobaica, Nepenthes gracilis, Nepenthes ampullaria, Nepenthes eustachya, Nepenthes rhombicaulis and one natural hybrid species Nepenthes reinwardtiana x spectabilis. Nepenthes tobaica, Nepenthes gracilis had upper and lower pitchers while Nepenthes ampullaria, Nepenthes eustachya, Nepenthes rhombicaulis and Nepenthes reinwardtiana x spectabilis just had an upper or lower pitcher. All species lived in low or high lands and most of them found in peat area, high humidity, and high light intensity.

Keywords
Nepenthes; Pitcher Plant; Sumatera Utara

Topic
Fundamental and Applied Sciences

Link: https://ifory.id/abstract/cXVKbNEhwZQt

Corresponding Author
Saronom Silaban

Institutions
(a) Department of Chemistry, Universitas Negeri Medan, Medan 20221, Indonesia
*silabans[at]gmail.com

Abstract
Amylase is a starch hydrolyzing enzyme. This protein is very important for various industrial processes. Microorganisms are considered as the best source of amylase production. This study aims to isolate amylolytic bacteria from rice soil samples that have the potential to produce amylase enzymes. Paddy soil samples were collected from two locations, Percut Sei Tuan and Lubuk Pakam rice field. The isolates obtained were then characterized macroscopically and microscopically. Macroscopic characterization was carried out by observing the morphology of bacteria with a microscope while microscopic characterization was carried out by the Catalase Test, Endospora Staining Test and Gram Staining. From the isolation that has been done, 14 isolates have the potential to produce amylase enzymes. The obtained isolates were tested with Iodine staining. Isolates that had been macroscopically characterized showed results such as: irregular shape, slippery edges, branched, wavy, circular, having macroscopic characterization. raised and convex colony elevation, white and beige. The isolates which were characterized by the catalase test showed positive results for all isolates. Characterization with Endospora Staining showed 7 isolates positive while 7 isolates negative. For the characterization by gram staining, obtained 7 isolates were gram positive and 7 isolates were gram negative. Thus, from the two sample locations obtained amylolytic bacteria that potentially produce amylase enzymes.

Keywords
amylase; bacteria; isolation; rice soil

Topic
Biochemistry, Biotechnology and Pharmacy

Link: https://ifory.id/abstract/43bqze6uZvXB

Corresponding Author
Stevanus Nalendra Jati

Institutions
a) Geology Engineering, Sriwijaya University
Srijaya Negara 1, Bukit Besar, Palembang, Indonesia
*s.nalendra[at]unsri.ac.id

Abstract
Studies on tectonic deformation of the Late Tertiary sequence during Late Neogene time has been carried out at the Renah Gajah Mati I region using balancing and restoring techniques, kinematic and dynamic analyses. The Late Neogene deformation was mainly controlled by compression, which has resulted in folding and thrusting. Hence, the rock sections underwent shortening that varied from 1.42-1.83 km or 0.75%-0.78% with the estimated rate of deformation 0.12-0.15 mm/year. Two types of tectonic structures developed within the region, fault propagation folds and trishear faults. The brittle deformation extended sequentially in the direction of tectonic transport, resulting in a series of faults. The generated faults constitute imbricate fans with a relatively closely-spaced thrust system. The array of thrusts is apparently associated with folds that strike NW-SE, implying the geometry of fault-linked folding. The hanging wall anticlines are generally asymmetric overturned folds, indicating a shallow ramping fault with a high shear pattern. In regional context, the general strike of structures within the study area appears relatively parallel to the NW-SE trending Barisan orogen. This feature suggests that tectonic transport responsible for structuring was likely at the NE-SW direction.

Keywords
Neogene Deformation; Folding; Faulting; Tectonic Transport

Topic
Fundamental and Applied Sciences

Link: https://ifory.id/abstract/kGtrfJKb7yC3

Corresponding Author
Vera Permatasari

Institutions
Indonesian Institute of Science (LIPI), Research Center for Testing Technology,Electromedical Division
Kawasan PUSPIPTEK Gedung 417 Setu, Tangerang Selatan 15314 Indonesia

Abstract
Abstrak: The quality of medical devices is paramount to establish the anamnesis, diagnosis and also treatment of patient. Arterial pressure measurement as one of the first indicators in the Hypertension Management Guidelines requires the accuracy as well as their function. Error in the detection of blood pressure should not occur during measurement because the errors will also make failure in determining the diagnosis and therapy for hypertensive patient, related on their hypertensive classification. Clinicians requires accurate medical measurement in order to monitor patients, diagnose diseases and deliver treatments. The failure of detection will certainly have diverse effects. Preliminary studies have shown that differences in results that are generated by two types of blood pressure devices, aneroid sphygmomanometers and digital blood pressure. The differences higher 2 to 3 mmHg using digital blood pressure than aneroid sphygmomanometer. This difference could lead to a new determination of blood pressure classification and could the accuracy of blood pressure devices that are widely used in medical circles. Therefore, it is necessary for medical staff to get information about the accuracy of blood pressure devices and its critical parameters in determining blood pressure, it is also necessary for a regulation on a blood pressure classification based on the type and level of accuracy of measuring instruments.

Keywords
digital blood pressure, blood pressure classification

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/wZzu7rBgmNGh

Corresponding Author
irwandi Irwandi

Institutions
Universitas Syiah Kuala, Banda Aceh, Indonesia

Abstract
The rheology of a material especially related to mechanical behavior is an important characteristic to understand for product design. Rheology has wide applications for example in nanomaterials, engineering design, biology, and in a large scale case in geodynamics study. Rheology relies on several physical equations such as continuity equation, momentum equation, gravity potential, state equation, heat transfer, and advection equation. The equations seem to be simple, however the application of those equations to a real case is not easy and cause many numerical problems. Marker-in-Cell (MIC) is a technique to solve a numerical rheology modeling problem especially diffusion of sharp gradients during the advection process. The technique successfully simulates the advection process for thermomechanical viscous material for a 2-dimensional case study. The model was initially set up two parts with laterally contrast difference of material characteristics. The lateral density difference of material induced gravitational force and generated circular movement of material. After the simulation was ran the for the 20-time step, the whole material moved more clockwise circulation. The model started to be stable when all denser material at the lower layer and lower density material at the upper part. The model was fully stable and become at stationary state at a time more than 100 time steps. The final simulation result showed that the MIC algorithm successfully simulated the conversion process involving the thermomechanical mechanism with diffusion error control and without breaking the contrast density of the material.

Keywords
Material Rheology, Thermomechanical Viscous 2D, Marker-in-Cell

Topic
Fundamental and Applied Sciences

Link: https://ifory.id/abstract/wZepP2uy6XN9

Corresponding Author
Marhaposan Situmorang

Institutions
1,2Department of Physics, Faculty of Mathematics and Natural Sciences, University of Sumatera Utara, Medan

1Email Addres: marhaposan[at]usu.ac.id

Abstract
Output power of Photovoltaic Generator (PVG) in a power system was tracked using duty cycle perturbation pulse applied into Maximum Power Point Tracking (MPPT) DC to DC boost converter. Perturbation pulse was controlled by Perturb and Observe (P&O) algorithm which is written in Arduino Uno microcontroller. Power system consist of PVG connected directly with MPPT DC to DC boost converter and then with DC to AC inverter and selected load is 20 W bulb. PVG efficiency was determined by the ratio between the PVG output electric power and the amount sunshine irradiation power received on the surface of PVG. MPPT efficiency was calculated base on output power of PVG work as an input power of MPPT and both input and output power of MPPT was measured using voltage sensor and ACS 712 current sensor. Voltage and current measurements was carried out in online system using Parallax Data Acquisition (PLX-DAQ) software and then voltage, current and power was tabulated in excell table. The graph of voltage, current and power was plotted as a function of time and shows the occurrence of power tracking of MPPT to extract maximum power from PVG after duty cycle of perturbation was applied. The performance of power system was determined by multiplying efficiency of PVG, MPPT and Inverter which gives the performance value around 93percent of PVG efficiency.

Keywords
Photovoltaic, Converter, Inverter

Topic
Electrical, Chemical and Electronic Engineering

Link: https://ifory.id/abstract/f2bDEARNJ67v

Corresponding Author
Tanachot Chaito

Institutions
a) Department of Statistics, Faculty of Science, Chiang Mai University, Chiang Mai 50200,Thailand
*tanachot.boy[at]gmail.com
b) Data Science Research Center, Department of Statistics, Faculty of Science, Chiang Mai University, Chiang Mai 50200,Thailand

Abstract
The objective of this research is to compare methods of parameter estimation for a zero inflated Weibull distribution (ZIW). The methods used to estimate parameters include the maximum likelihood estimation (MLE), the expectation maximization (EM) algorithm and the percentile estimation (PE). The results of a simulation study; the MLE and EM methods gave small mean square error (MSE) values and both methods are effective in estimating parameters which are not different while the PE method (using the 25th and 75th) had small average relative bias (AvRB) values when sample size and shape parameters increase. Therefore, the MLE and EM methods were the best parameter estimation method for a ZIW distribution. In this research the monthly rainfall data from two rain gauging stations at Pua and Mueang, Nan, Thailand during the period of 1960 to 2017 were used in this study. The goodness of fit test of monthly rainfall data from two stations found that a ZIW distribution was the most appropriate. Moreover, when we analyzed the tendency of drought, Mueang station had no tendency for drought but Pua station had a rain trend.

Keywords
Expectation Maximization algorithm; Maximum Likelihood estimation; percentile estimation; rainfall data

Topic
Applied Mathematics and statistics

Link: https://ifory.id/abstract/uGQXLzy89frR

Corresponding Author
Devi Lestari

Institutions
Ani Iryani12, Devi Lestari2, and Djoko Hartanto3*
1Department of Chemistry, Universitas Pakuan, Bogor, Indonesia, 16143, ani_iryani62[at]yahoo.co.id
2Department of Chemistry, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia, lestaridevi270[at]gmail.com
3Department of Chemistry, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia, askanovitas[at]gmail.com
(Djoko Hartanto *)

Abstract

Keywords
ZSM-5, TiO2, Photocatalys, Disperse Blue, Carbon Source

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/cJxL4EnG36jy

Corresponding Author
Siti Marwati

Institutions
1. Chemistry Education Department
Faculty of Mathematics and Natural Sciences
Yogyakarta State University, Yogyakarta, Indonesia
2. Chemistry Department
Faculty of Mathematics and Natural Sciences
Gadjah Mada University, Yogyakarta, Indonesia

Abstract
Graphite electrode was modified by electropolymerization of eugenol in alkaline medium by cyclic voltammetry. The polyeugenol-graphite electrode (GEEU) was than used for determination of hydroquinone (HQ) at phosphate buffer solution (PBS) of pH 7.0 by cyclic voltammetry technique. The performance of this modified has shown excellent electrocatalytic activity toward of HQ than unmodified electrode (GE). The reduction of peak separation has been decreased from 0.309 V to 0.228 V. In addition, the effect of scan rates indicate that redox electrochemical behaviour of HQ is diffusion controlled electrochemical process on GEEU. Under experimental, the oxidation peak current increases linearly with concentration of HQ at ranged from 1.42 micro M to 101.07 micro M at the linear regression equation of Ip = 3.86C + 355.20. On the other hand, the oxidation peak current raises linearly with concentration of HQ at higher ranged from 136.67 micro M to 450.50 micro M at the linear regression equation of Ip = 1.69C + 559.72. The LOD and LOQ were measured at lower concentration of HQ, 1.44 micro M and 4.37 micro M, respectively. Moreover, the proposed modified has been successfully applied to the determination of HQ in cosmetic sample with satisfactory recoveries.

Keywords
eugenol; hydroquinone; voltammetry

Topic
Fundamental and Applied Sciences

Link: https://ifory.id/abstract/hxH2B6WTuADg

Corresponding Author
AGUS WIBAWA

Institutions
a) Institut Teknologi Sepuluh November (ITS) Surabaya
*aguswibawa.ptpjb[at]gmail.com
b) Institut Teknologi Sepuluh November (ITS) Surabaya
c) Institut Teknologi Sepuluh November (ITS) Surabaya

Abstract
The power plant industry has to be able to cope with stringent regulatory constraints, safety and reliability standards. Hence a power plant needs to address those problem by implementing a sound and good asset management practices to ensure level of power plant performance set are met. Usually the power plant performances set by company are difficult to be met by aging power plants. They are hardly capable of delivering the requested performance due to their operational age. Several questions are raised to deal with the aging power plant such as should the power plant be maintained, improved and or discarded? Those questions are difficult to be answered as for any power plant there were great deal amount of money has been involved since the very beginning of power plant construction until their operation stage. Due to this fact a novel approach on how to deal with the problems is proposed in this paper. A novel framework of assets management will be developed by considering many factors and criteria of power plant performance related to efficiency reliability and economics aspect of the power plant through its entire life. The framework is called as Holistic Operation and Maintenance Excellence (HOME). In this paper, the authors would like to present literature survey related to the HOME framework. It is expected that the will be proposed HOME framework will be capable of dealing with problems raised previously based on the works in the power plant asset management previous research reported in this paper. The HOME framework objectives are integrating power plant asset management, obsolescence and economic planning to optimize operation and maintenance, efficiency, reliability and service life of Systems, structures and components. An LCM plan is a guide to make operational & maintenance decision for a piece of equipment over its life cycle. The developed LCM framework addresses a wide range of theoretical and practical issues, including the models, methods, and the strategies employed to optimize power plant asset in term of fuel, operation and maintenance was provide. Potential gap has been discussed and proposed for next research.

Keywords
Power Plant, Life Cycle Management (LCM), Holistic Operation and Maintenance Excellence (HOME)

Topic
Fundamental and Applied Sciences

Link: https://ifory.id/abstract/QKgNGRY7CvA3

Corresponding Author
Togi Tampubolon

Institutions
(a)Department of Physics Education, State University of Medan, Medan, Indonesia
(b)Center for Space and Remote Sensing Research, National Central University, Republic of China

Abstract

Keywords
Soil Moisture, NDVI, LST, Landsat, Medan

Topic
Fundamental and Applied Sciences

Link: https://ifory.id/abstract/K7JUnej3Ca6L

Corresponding Author
syarifa mayly

Institutions
1 Program study of Agroecotechnology, Faculty of Agriculture, University of Al Washliyah, Medan 20155, Indonesia
2 Program study of Agrotechnology, Faculty of Science and Technology, University of Pembangunan Panca Budi, Medan 20122, Indonesia

Abstract
The study aims was to obtain the root characteristic of soybean in various biochar application. The research design used was factorial randomized design with two factors and two replications. Various biochar application used as first factor were biochar from rice husk, biochar from rice straw, without biochar. Two varieties of soybeans were used in this research were Dering and Demas. Root characteristic observed were specific root length, root length : root volum ratio, root tissue density, root to shoot ratio, root biomass ratio, root length ratio. The research result showed that the highest value of root characteristic like pecific root length, root length : root volum ratio, root tissue density were found from rice husk biochar and other root characteristic like root to shoot ratio, root biomass ratio, root length ratio which the highest value were found from without biochar application.

Keywords
root, biochar, soybeans, dryland

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/rJftQknB8gHT

Corresponding Author
Elmanani Simamora

Institutions
a) Department of Mathematics of Faculty of Mathematics and Natural Sciences, State University of Medan, Jalan Willem Iskandar/Pasar V, Medan 20221, Indonesia
*elmanani_simamora[at]unimed.ac.id
b)Department of Mathematics of Faculty of Mathematics and Natural Sciences, State University of Medan, Jalan Willem Iskandar/Pasar V, Medan 20221, Indonesia

Abstract
In practice, the parameters in the kriging model are unknown, but they can be estimated based on the behavior of the observed data. Parameters in the kriging model can be estimated based on the consideration of Regression-Kriging models. Regression-Kriging models are Universal Kriging models with polynomials of degree zero (Ordinary Kriging), one (Universal Kriging with degree one), or two (Universal Kriging with degree two). A new method for estimating the parameters in the Kriging model with semiparametric bootstrapping is proposed in this paper. The semiparametric bootstrapping procedure works by combining the bootstrap method and Kriging

Keywords
Kriging; regression; Simulation; Deterministic ; Semiparametric; Bootstrapping

Topic
Applied Mathematics and statistics

Link: https://ifory.id/abstract/EuZAvp8KWjkd