Riris I.D.,State University of Medan |
Napitupulu M.A.,State University of Medan
Asian Journal of Chemistry | Year: 2017
This paper describes the potential of methoxy bergenin isolated from ethanol extract of the raru stem bark (Vatica pauciflora Blume) to be antidiabetics. In the experiment, each of the alloxan induced wistar rats group is given a dose of 65 mg/200 g BB/2 mL, 130 mg/200 g BB/2 mL and 195 mg/200 g BB/2 mL of methoxy bergenin. On the day of 14 and 21 of treatment, the blood sugar levels of wistar rats are measured by a glucometer. The ANOVA result showed there are the different effects of methoxy bergenin on the blood sugar levels of wistar rats significantly. The dose of 195 mg/200 g BB/2 mL on day 21, give the best effect of a decrease in the blood sugar levels. The ttest results showed the wistar rats's body weight are also decreased significantly after 21 days of treatment. Based on these the methoxy bergenin has a potential as an antidibetics which resembles acarbose. © 2017, Chemical Publishing Co. All rights reserved.
Sunarno A.,State University of Medan |
Syaifullah R.,State University of Medan |
Sihombing D.,State University of Medan
IOP Conference Series: Materials Science and Engineering | Year: 2017
The aim of this research was to find out the relations between social cultural background of people of North Sumatera province in Indonesia (helper, show off, dominate, self-ego, hard worker, independent) in relation to sport achievement. This research used descriptive method by reviewing existing literature. Sample of this research was 1072 athletes from 34 different group of sport that have been participating in National Sport Competition (PON) in years 2004, 2008, 2012, 2016. The result shows that nine different kinds of self-defence group have been chosen by 291 athletes such as: fencing, wrestling, Judo, Karate, Pencak Silat, Taekwondo, Tarung Derajat, Boxing and Whusu. In contrast, 781 athletes preferred to another kinds of sport than self-defence, 148 for measurable sport, 143 for accuracy sport, and 490 for games sport group. Eventually, self-defence athletes always contribute highest medals in each national sport competition event. In conclusion, the research shows that social-cultural background of people of North Sumatera has significant relationship to the sport achievement. The implication of research's results can be utilized as a basic talent scouting and talent development for determining young talented athletes in North Sumatera. © Published under licence by IOP Publishing Ltd.
Sriadhi,State University of Medan
IOP Conference Series: Materials Science and Engineering | Year: 2017
This research is constituted by the low inventory service performance that causes decreased performance of the institution. This study was aimed at build an inventory model using multimedia based information system that generates inventory data output form of text and 3D visuals for the specific needs of the user. This study is developmental research and development program using the System Development Life Cycle (SDLC). The program menu includes inventory data, circulation usage, maintenance and development as well as financial transactions. Feasibility testing program conducted by Stub Testing, Unit Testing, Black Box and White Box Testing and Integration Testing. Execution of the program includes Log System, Security Access, Menu of Manager, Data Entry, Circulation, Maintenance, and Report. This information system is able to present a statement in the form of text, graph and 3-D visual (multimedia), data entry by scaning barcode system, multi user system, top-down and grass-root access so as to meet user needs in comprehension. The use of this information system can improve the efficiency of material inventory services to achieve higher productivity. The program is designed as an open source program that can be used and developed more widely. © Published under licence by IOP Publishing Ltd.
Hariadi,State University of Medan
IOP Conference Series: Materials Science and Engineering | Year: 2017
The aim of the study is to develop an authentic assessment instrument for manipulative fundamental motor skills in Physical, Sport and Health Education for elementary school in Medan, North Sumatera. This study uses research and development method with procedure from Djaali and Muljono. The instrument which was develop consist of assessment of manipulative fundamental motor skills. The qualitative and quantitative analysis shows that the instrument have the good content validity, construct validity and reliability. It is also have the good difficulty level and distinguished power for cognitive assessment. It can be concluded that the authentic instrument of manipulative fundamental motor skills in physical education and sport learning can be used widely as an assessment instrument in the teaching and learning for Physical, Sport and Health Education skills for fourth grade students of primary school. © Published under licence by IOP Publishing Ltd.
Nasution I.N.,State University of Medan |
Alvan S.,State University of Medan
Procedia Engineering | Year: 2017
The growth of time demands human to evolve needs. House as a primary needs is inseparable from the development of human life needs, especially in urban areas. The phenomenon of urban houses requires architects, developers, and even residents to be able to plan and collaborate in considering needs and limitations of land use. Humid tropical climate condition is a challenge for the planners or architects in creating indoor condition of the building that is eligible for dwelling. This paper aims to describe a simulation of interior arrangement to proving a design of efficient energy houses. The houses in urban areas are density houses with diverse environmental situations including density environmental housing and real estate. The identity of urban houses is characterized by inability to organize a dense interior space. Therefore, the requirements of comfortable and healthy dwelling are not fulfilled properly. The efforts to develop efficient energy, environmentally friendly and sustainable houses can be done through optimization approach of architectural design. The purpose of optimization is to find answers for possibilities of architectural design problems in order to obtain the best solution. The method of this research has been done by field observations to determine the pattern of spatial planning in several houses in Medan. In the process of model optimization, a possible improvement of existing dwelling model is designed through cyclical and analyzing planning, and alternative solutions that are sustainable and affect each other. The results of this analysis are expected to be a benchmark for local architects, researchers, and also residents in developing design optimizations, especially houses that have been built. This paper is a further research related to model developments of houses for urban community in Medan. Through an appropriate alternative interior arrangement, this research is expected to achieve the optimum design of houses based on the character of the urban environment without losing its identity as dwelling. © 2017 The Authors.
Simanjuntak J.P.,Universiti Sains Malaysia |
Simanjuntak J.P.,State University of Medan |
Zainal Z.A.,Universiti Sains Malaysia
Biomass and Bioenergy | Year: 2015
This study aims to improve the heating value (HV) of gas produced during the gasification of sawdust using a new type of air-blown gasifier based on a two-compartment cylindrical fluidized bed. The gasification process is based on an internally circulating aerated fluidized bed (ICAFB) and consists of two individual zones; a gasification zone in the annulus and combustion zone in the draft tube. The annulus and draft tube are connected via orifices at the lower section of the draft tube wall to enable the solids to move from the annulus to the draft tube. Char, gasified residue, together with hot bed material move to the draft tube and combust to produce heat. Fluidization ratio (RQ) which is the ratio of air flow rate in the annulus (Qan) to the air flow rate in the draft tube (Qdt) together with equivalence ratio (ER) were used to control the temperature of the gasifier. The effects of ER on the temperature system stabilization, composition, HV of producer gas (PG) and gasifier performance were presented. ER ranges from 0.148 to 0.203 were used in this study. PG compositions of 3.13%, 2.28%, 25.8%, 8.2% and 22.48% for H2, O2, CO, CH4 and CO2 respectively with a HV of about 6.96 MJ m-3 were obtained at an ER of 0.185 and temperature of about 866°C. Compared with previous air-blown fluidized bed biomass gasification results, the ICAFB gasifier is capable of producing producer gas with higher CO and CH4 fractions. © 2015 Elsevier Ltd.
Sirait T.M.,State University of Medan |
Derlina,State University of Medan
Proceedings of the 2015 International Conference on Technology, Informatics, Management, Engineering and Environment, TIME-E 2015 | Year: 2015
The objectives of this research was to analyze whether the problem based learning model has a better effect than the direct instructional model towards physics learning outcomes. It also aims at using the problem based learning model for analyzing the student learning activity in an experimental class. The populations used in this research are three classes of high school students in SMAN 2 Balige, Indonesia (Classes X1, X2, X3, A.Y. 2014/2015). The control sample was class X1 whereas the experimented class was class X3. The analysis of the experiment in this research was based on the quasi-experimental method with two groups were being used for pretest and posttest designs. The data were collected using learning outcomes of seven essay writing tests and the learning activities were observed using some predesigned observation sheet. The data were analyzed using the descriptive and inferential statistics of obtained from the t-test of independent samples. The test was done using a significance level of 0.05. The result of the test showed that both of the students' samples have normal distribution when the population was assumed to be homogeneous. The test showed that the problem based learning model provides better effects than the direct instructional model when used to assess the student learning outcomes in a dynamic electricity class. © 2015 IEEE.
Ginting E.M.,State University of Medan |
Bukit N.,State University of Medan
Indonesian Journal of Chemistry | Year: 2015
This study investigated the use of the electrochemical method to prepare alumina (α -Al2O3) from aluminum metal. The α-Al2O3 precursor was calcined at 110 °C for six hours and then characterized using Fourier Transform Infrared (FTIR) spectroscopy, Particle Size Analysis (PSA), X-Ray Diffraction spectroscopy (XRD), and Scanning Electron Microscopy (SEM). To study transformation of the precursor into α-Al2O3, three samples were sintered at 400, 800, and 1200 °C, respectively and they were characterized. The most interesting result obtained was the transition of AlOOH and α -Al(OH)3 into γ-Al2O3 at low temperatures (400 to 800 °C), followed by transformation of γ-Al2O3 into α -Al2O3 at high temperature (1200 °C). The overall results obtained demonstrated that electrochemical method is a potential alternative for production of α-Al2O3, which can be achieved in practically pure phase at sintering temperature at 1200 °C. © 2015, Gadjah Mada University. All rights reserved.
Luthan P.L.A.,State University of Medan
IOP Conference Series: Materials Science and Engineering | Year: 2016
Mandailing is one of bataknesse ethnic in North Sumatera which belong to strong to hold the customs and traditions Mandailing culture which reflected in the parts of the traditional houses. However rapidly the construction modern house make possibility the traditional house which enriched with culture value will be extinct.This studyto identify the value of culture and architecture typology of traditional house in Mandailing Natal North Sumatera. A case study using phenomenology method that is recording and serving the phenomenon which found in field as evidence that include existing condition from building. The finding show that 1) religion system or reliance in the front of location election, ornamentation orientation, construction system and room arrangement, 2) kinship system in the front of room organization, room amount and the completeness, 3) live philosophy found in shape and room arrangement which can accomodate all activity, 4) leadership system in the front of ornamentation shape and the meaning, pillar shape, house size vertically, and 5) social system in the front of roof shape, the used of decoration style and room arrangement. Architecture typology of Mandailing house dug from the shape and the construction, room arrangement, and roof shape. © Published under licence by IOP Publishing Ltd.
Rangkuti Y.M.,State University of Medan |
Sinaga M.S.,State University of Medan |
Marpaung F.,State University of Medan |
Side S.,University of Indonesia
AIP Conference Proceedings | Year: 2014
In this work, Vaccination (V), Susceptible (S) Infected (I), and Recovered (R) (VSIR) model for transmission of Tuberculosis in North Sumatera is modified. An exposed class is adopted to VSIR model so called VSEIR to determine the probability of people who infectious before infected. This model is written in ordinary differential equation (ODEs) in five classes. Determination the equilibrium point and stability analysis of the model is discussed to determine the dynamic behaviour of systems. A simulation is also discussed to see the suitable model to North Sumatera data. The simulation of VSEIR model indicates Tuberculosis has not endemic in North Sumatera. © 2014 AIP Publishing LLC.