Medan, Indonesia
Medan, Indonesia

The Sumatera Utara University or is a public university located in the city of Medan in North Sumatera, Indonesia.It is situated in Padang Bulan, in the Medan Baru subdistrict of Medan, close to the City Centre, with a total area of 122 hectares. Due to an increase in student numbers, a new campus is being constructed in Kwala Bekala, 15 km distant, with a 300 hectare campus area.Its rectors serve eight-year renewable terms.USU was established as a Foundation Universitet North Sumatera on June 4, 1952. The first is the Faculty of Medicine Faculty which was established on August 20, 1952, now commemorated as the anniversary USU. President of Indonesia, Sukarno then USU inaugurated as the seventh state university in Indonesia on November 20, 1957. Wikipedia.


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Misran E.,National University of Malaysia | Misran E.,University of North Sumatra | Hassan N.S.M.,National University of Malaysia | Daud W.R.W.,National University of Malaysia | And 2 more authors.
International Journal of Hydrogen Energy | Year: 2013

In this investigation, water in a single-cell proton exchange membrane (PEM) fuel cell was managed using saturated hydrogen and dry air. The experiment was conducted at temperatures of 40, 50 and 60 C and pressures of 1 and 1.5 bar at both the anode and cathode gas inlets. The feed velocities of hydrogen and air were fixed at 3 and 6 L min-1, respectively. After reaching steady-state conditions, the relative humidity along the single serpentine gas channel was measured. From the experimental data, water transport properties were characterized based on a membrane hydration model. The electro-osmotic drag coefficient, water diffusion coefficient, membrane ionic conductivity and water back-diffusion flux were significantly influenced by the water content in the membrane of the PEM fuel cell. The water content depended on the relative humidity profile along the gas channel. In this investigation, a negative value for the water back-diffusion flux was measured; thus, the transport of water from the cathode to the anode did not occur. This phenomenon was due to the large water concentration gradient between the anode and cathode. Therefore, this strategy successfully prevented flooding in the PEM fuel cell. Copyright © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Campbell-Smith G.,University of Kent | Simanjorang H.V.P.,University of North Sumatra | Leader-Williams N.,University of Kent | Linkie M.,University of Kent
American Journal of Primatology | Year: 2010

Human-wildlife conflicts, such as crop-raiding, increase as people expand their agricultural activities into wildlife habitats. Crop-raiding can reduce tolerance toward species that are already threatened, whereas potential dangers posed by conflicts with large-bodied species may also negatively influence local attitudes. Across Asia, wild pigs and primates, such as macaques, tend to be the most commonly reported crop raiders. To date, reports of crop-raiding incidents involving great apes have been less common, but incidents involving orangutans are increasingly emerging in Indonesia. To investigate the interplay of factors that might explain attitudes toward crop-raiding by orangutans (Pongo abelii), focal group discussions and semi-structured interviews were conducted among 822 farmers from 2 contrasting study areas in North Sumatra. The first study area of Batang Serangan is an agroforest system containing isolated orangutans that crop-raid. In contrast, the second area of Sidikalang comprises farmlands bordering extensive primary forest where orangutans are present but not reported to crop-raid. Farmers living in Batang Serangan thought that orangutans were dangerous, irrespective of earlier experience of crop-raiding. Farmers placed orangutans as the third most frequent and fourth most destructive crop pest, after Thomas' leaf monkey (Presbytis thomasi), wild boar (Sus scrofa), and long-tailed macaque (Macaca fascicularis). Although most (57%) farmers across both study areas were not scared of wildlife species, more than a quarter (28%) of the farmers' feared orangutans. Farmers in Batang Serangan were generally more tolerant toward crop-raiding orangutans, if they did not perceive them to present a physical threat. Most (67%) Batang Serangan farmers said that the local Forestry Department staff should handle crop-raiding orangutans, and most (81%) said that these officials did not care about such problems. Our results suggest that efforts to mitigate human-orangutan conflict may not, per se, change negative perceptions of those who live with the species, because these perceptions are often driven by fear. © 2010 Wiley-Liss, Inc.


Nurwahyuni I.,University of North Sumatra | Sinaga R.,University of North Sumatra
International Journal of Pharma and Bio Sciences | Year: 2014

In vitro propagation for bioconservation of threatened Brastagi citrus, local citrus in North Sumatra Indonesia is explained. The aims of bioconservation is to protect Brastagi citrus from diminish in the ecosystem due to the eruption of Mount Sinabung. The studies were conducted through cuting bud propagation to prepare explant sources followed by in vitro propagation to obtain plant seedling. The propagation was carried out by cutting the bud from branch of survive Brastagi citrus and stick onto the bark of sour citrus (Citrus aurantium) root stock. In vitro propagation was conducted experimentally with treatment combinations to obtain seedling of Brastagi citrus for bioconservation. The results showed that cutting bud propagation has successfully conducted to rescue three varieties of Brastagi citrus and to provide explant material for in vitro propagation. The callus were grown in all explants for all treatments. Two types of callus were observed, one in brown color, watery and non embryogenic, and the other was embryogenic callus with green color. The embryogenic callus is nodular that was develops and directly regenerate to plantlet. Growth stimulator in medium culture was significantly influenced callus induction, the growth of somatic embryo, plantlets, leaves, and roots.


Wahab I.,University of North Sumatra
International Journal on Advanced Science, Engineering and Information Technology | Year: 2016

Development's Millennium Development Goal (MDG) on reducing infectious diseases including HIV / AIDS. The program still faces many obstacles, because the problem of HIV / AIDS isrelated to lack of knowledge and understanding of the community. The resistance of the socio-cultural aspects in counselling is happening, especially in Aceh province as religion-based province. In connection with the program to improve public knowledge in the prevention of HIV / AIDS, communication concept developed should always pay attention to the closeness between the aspects of culture, psychological, and social. This study aims to determine the appropriate method of communication in the prevention of HIV / AIDS in North Aceh District by religious leaders (religious teacher) and health counselors. This study is a quasi-experimental (quasi-experimental study pre-test and post-tests design). This study was conducted in North Aceh District covers three districts and each sub-district consists of two villages namely Lhoksukon Subdistrict (Desa Ara Abe and Village Nga), Dewantara subdistrict (Desa Paloh Lada and Village Bangka Jaya), Seunuddon districts (Village Ulee Rubeek West and the village of Ulee Rubeek Timu). This research has been conducted in April-May 2015. Thepopulations were used as much as 14.020 couples of reproductive age and the samples were obtained using a sample size of at least 132, according Lemeshow in every village so that the entire sample of 492 couples of childbearing age. Data were analysed using a pre-test and posttest gain index, while hip dissertation test using Mann-Whitney U. Based on the results showed that the empirically proven that the model of health education approach method with religious leaders (religious teacher) proved more effective than the model of health education undertaken by health counsellors. There are differences in the level of knowledge about the prevention of HIV / AIDS significantly in women of reproductive after the health education provided by religious teacher and health counsellors, (p = 0.001 <0.05). Increased knowledge score Aged Women of Reproductive about the prevention of HIV / AIDS are taught by religious teacher was significantly higher than the score of knowledge of women of reproductive who receive counselling by health counsellors women of reproductive are more enthusiastic to follow counselling that delivered by religious teachercompare to the counselling which delivered by health counsellors. Proximity psychological, emotional, social and culture among women of reproductive age with religious teacher. This is because the religious teacher can customize the material submitted by the communicant sociopsychologic. During this time the role of religious teacher is more on improving the quality of faith and morality, while the implementation in the prevention of various diseases that can be affected the public. It is suggested that the religious teacher should be empowered to educate the public about health through religious approach by using effective communication methods to improve public knowledge.


Ginting R.,University of North Sumatra | Ramadhan T.F.F.,University of North Sumatra
IOP Conference Series: Materials Science and Engineering | Year: 2016

The development of automobile industry in Indonesia is growing rapidly. This phenomenon causes companies related to the automobile industry such as tire industry must develop products based on customers' needs and considering the timeliness of delivering the product to the customer. It could be reached by applying strategic planning in developing an integrated concept of product development. This research was held in PT. XYZ that applied the sequential approach in designing and developing products. The need to improve in one stage of product development could occur re-designing that needs longer time in developing a new product. This research is intended to get an integrated product design concept of tire pertaining to the customer's needs using Concurrent Engineering Tools by implementing the two-phased of product development. The implementation of Concurrent Engineering approach results in applying the stage of project planning, conceptual design, and product modules. The product modules consist of four modules that using Product Architecture - Design Structure Matrix to ease the designing process of new product development. © Published under licence by IOP Publishing Ltd.


Sinaga B.Y.,University of North Sumatra | Amin M.,University of North Sumatra | Siregar Y.,University of North Sumatra | Sarumpaet S.M.,University of North Sumatra
Acta medica Indonesiana | Year: 2014

AIM: To explore the role of FokI and BsmI polymorphisms the VDR gene in the susceptibility to pulmonary tuberculosis (PTB) in an Indonesian Batak ethnic population.METHODS: Matched case-control study was conducted on 76 PTB patients and 76 healthy normal control. Genetic polymorphisms of Vitamin D Receptor (VDR) gene were analysed using PCR-RFLP.RESULTS: The frequencies of FokI genotypes were FF 35.5%, Ff 55.3%, ff 9.2% for PTB patients and FF 39.5%, Ff 44.7.% and ff 15.8% for normal control. The BsmI genotypes frequencies were BB 0%, Bb 68.4%, bb 31.6% for TB patients and BB 2.6%, Bb 23.7% and bb 73.7% for control. There was no significant association between FokI genotype and PTB (OR 1.39, 95% CI: 0.69-2.77 for Ff genotype and OR 0.64, 95% CI: 0.22-1.86 for ff genotype). There was a significant association between BsmI genotype and PTB; the bb genotype was associated with a decreased risk to PTB (OR 0.22, 95% CI: 0.11-0.45).CONCLUSION: In Indonesian Batak ethnic population, there was no association between FokI polymorphism of VDR gene with host susceptibility to PTB. There was a significant association between BsmI polymorphism of VDR gene; bb genotype was associated with a decreased risk to PTB.


Nasution H.,University of North Sumatra
Green Building, Materials and Civil Engineering - Proceedings of the 4th International Conference on GreenBuilding, Materials and Civil Engineering, GBMCE 2014 | Year: 2015

The effects of Maleic Anhydrate (MAPP) as compatibilizer on tensile properties and water absorption of Recycle Polypropylene (rPP)/Oil Palm Empty Bunch Fruit (OPEFB) composites were investigated. Several contents of MAPP viz. 2, 4, 6, 8 wt.% were prepared. Corresponding rPP/ OPEFB composite without MAPP addition was also made for comparison. The OPEFB composition was fixed at 30 wt.%, while rPP was 70 wt.% and reduced correspondingly on the addition of MAPP. Composites were prepared in extruder with temperatur of 190 °C. Results indicated an improvement in tensile strength and elongation at break were obtained on the addition of MAPP up to 6 wt.%. It was also revealed that the water absorption was significantly decreased as the MAPP was increased up to 6%. However, the addition of 8 wt.% MAPP was found to reduce these properties. Scanning electron microscopy (SEM) images from the tensile fracture surface supported that the improvement on interface region between matrix and filler have occurred. © 2015 Taylor & Francis Group, London.


Nasution S.Z.,University of North Sumatra
International Journal on Advanced Science, Engineering and Information Technology | Year: 2015

In Indonesia, the Central Bureau of Statistics of North Sumatra Province (2011), estimates that in 2010 the infant mortality rate of 24.5 per 1,000 live births. This figure decreased when compared to the previous year at 26.90 per 1,000 live births. There are several factors influencing the reduction in infant mortality, among others, the availability of various facilities or accessibility factors and health services from skilled medical personnel and the willingness of people to change the traditional life to the norm of modern life in the field of health. this study aims to explore how families with Mandailing culture care for pregnant mother in in term of nutritional support. Informants in this study are Mandailing Natal community. This study found that If there are health workers or health care in they place, pregnant mother will come to check their condition and their nutritional status at health workers during childbirth although later they are more happy assisted by traditional birth attendants or village shaman, it can reduce the complications or problems that the pregnant women who will ultimately reduce maternal mortality and infant mortality rate. Mandailing Natal society is a society that is not closed to new information, the community here is relatively easy in receiving information or a new thing, it's just that sometimes less precise methods of delivery that makes people not obey the things delivered. To improve community health status Mandailing Natal especially pregnant mother and childbirth it is advisable: That the government is aggressively disseminating health programs so that the public is more familiar with the health programs in a way reproduce health workers, especially midwives who will assist communities in improving the health of pregnant mothers especially in term of their nutrition and health services in Mandailing Natal to be more proactive in providing community especially related information to the health of pregnant mothers.


Nasution M.K.M.,Fakultas Ilmu Komputer Dan Technology Informasi | Nasution M.K.M.,University of North Sumatra
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

In this paper we study the relationship between query and search engine by exploring some properties and also applying their relations to extract keyword for any social actor by proposing new method. The proposed approach based on considering the result of search engine in the singleton and doubleton. In this paper, we develop a novel method for extracting keyword automatically from Web with mirror shade concept (M2M). Results show the potential of the proposed approach, in experiment we get that the performance (recall and precision) of keyword depend on both weights (singleton and tfidf) and the distance of them. © 2014 Springer International Publishing Switzerland.


to investigate the safety and effectiveness of dose TU+DMPA hormones in developing potential male contraceptives. suppression of rat sperm concentration through increased apoptotic germ cells by in vivo administration of a long-acting androgen composed of a combination of testosterone undecanoate (TU) and depot medroxyprogesterone acetate (DMPA) was performed. Adult Sprague-Dawley rats received 2.5 mg TU every 6 week and 1.25 mg DMPA every 12 week for 60 week, a regimen known to rapidly reduce testosterone production by the testes and produce azoospermia within 12 week. Sperm concentration data were log transformed before analysis. Results are expressed as the mean±SEM. ANOVA, followed by post hoc test was used to determine differences across time and phase. T test was employed to determine differences between two groups. apoptosis revealed significant increase in apoptotic germ cells (80% when rats were administered with TU+DMPA. Apoptotic germ cells can be found in several spermatogonia (20%), spermatocytes (30%), and spermatids (50%). dose TU+DMPA hormones may be a safe and effective way to develop potential male contraceptives.

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