Massimo Lowicki-Zucca, Sarah Karmin, Karl-Lorenz Dehne,
... 9; Garrett, (see n.5 above); John Kemoli Sagala, 'HIV/AIDS Prevention Strategies in the Armed Forces ... Society, Vol.34, 2008, p.292; John Kemoli Sagala, 'HIV/AIDS and the Military in Sub-Saharan ... n.5 above); McInnes (see n.5 above); Sagala (see n.7 above). US Department of Defense ...
Tópico(s): International Development and Aid
2009 - Taylor & Francis | International Peacekeeping
Christoph Hauzenberger, A. Bauernhofer, G. Hoinkes, E. Wallbrecher, E.M. Mathu,
... intercalated amphibolites. (3) A 10 km wide zone (Sagala Hills zone) between the strike slip zone (unit ... a different tectono-metamorphic event than unit 3 (Sagala Hills zone) and 4 (Taita Hills). The major ...
Tópico(s): High-pressure geophysics and materials
2004 - Elsevier BV | Journal of African Earth Sciences
Gaffar Hafiz Sagala, Dóra Őri,
Abstract The core success of digital transformation among small and medium enterprises (SMEs) still needs to be clarified and comprehensively discussed. Meanwhile, SMEs cannot exploit digital advantages due to their limited strategic empirical and practical knowledge. This study aims to (1) describe the research pattern in the SME’s digitalization area; (2) identify the core success factors of SMEs' digital transformation to gain business success; (3) search for relevant business aspects that are necessary ...
Tópico(s): Digital Transformation in Industry
2024 - Springer Science+Business Media | Information Systems and e-Business Management
Tamer S Al-Shboul, Farad Sagala, Nashaat N. Nassar,
Oil wax deposition and precipitation are becoming a major problem during oil production, transportation, and refining. Deposition mitigation by chemical additives, like polymer and surfactants, are commonly used in the oil industry. Because there is no clarity in wax inhibition mechanisms of the additive with crude type and conditions, chemical wax inhibitors are still used in a trial-and-error manner in the oil fields, which is an expensive and inefficient methodology. Understanding the wax inhibition ...
Tópico(s): Hydrocarbon exploration and reservoir analysis
2023 - Elsevier BV | Advances in Colloid and Interface Science
Haikal Rahman, Ali Fikri Hasibuan, Dedy Husrizal Syah, Gaffar Hafiz Sagala, Rangga Restu Prayogo,
Nowadays, entrepreneurship is a subject that attracts attention for all majors in higher education. However, the determination of learning outcomes in entrepreneurship education is still debatable, especially in non-entrepreneurship majors. This study aims to 1) examine the role of attitude toward entrepreneurship, which is proxied by the entrepreneurial mindset, towards intrapreneurship belief among business students and 2) measure how motivation affecting the attitude toward entrepreneurship among ...
Tópico(s): Higher Education and Employability
2022 - Taylor & Francis | Cogent Education
Avianto Amri, Jonatan Lassa, Yusra Tebe, Nuraini Rahma Hanifa, Jeeten Kumar, Saut Sagala,
The World Conference on Disaster Reduction 2005 endorsed the first and significant global promotion for Disaster Risk Reduction (DRR) integration in schools. Within 15 years of progress of the global and national movements for DRR education in Indonesia, this research asks three key research questions: First, how do schools adopt and sustain DRR education? Second, how do local and national actors upscale the integration of DRR education in schools? Third, what are the challenges and opportunities ...
Tópico(s): Disaster Response and Management
2022 - Elsevier BV | International Journal of Disaster Risk Reduction
Cheng Wen, Jon C. Lovett, Elisabeth Rianawati, Teresa R. Arsanti, Siti Suryani, Adi Pandarangga, Saut Sagala,
Global efforts to improve electricity access in developing countries need to go beyond the simple measurement of electrification rates to address the quality of electricity supply. Households' preferences and willingness to pay (WTP) for electricity supply is important information for policy makers, utility companies, and other stakeholders to plan investment in power infrastructure, design business models, and tackle energy-related social equality issues. However, the existing literature is largely ...
Tópico(s): Social Acceptance of Renewable Energy
2022 - Elsevier BV | Energy Research & Social Science
Indra Maipita, Muhammad Bukhori Dalimunthe, Gaffar Hafiz Sagala,
In early 2020, the Ministry of Education and Culture released the Merdeka Belajar policy to innovate higher education learning in Indonesia.Its policy aimed to bridge the gap between business, industry, and higher education.So that higher education institutions can produce greater human resources to earn a competitive advantage.Of course, this policy must be followed up by universities, specifically at the Faculty level, to be crucial as a reference for study programs technically and conceptually ...
Tópico(s): Pancasila Values in Education
2021 - Atlantis Press | Advances in economics, business and management research/Advances in Economics, Business and Management Research
Stephen Sutton, Douglas Paton, Petra Buergelt, Saut Sagala, Ella Meilianda,
Growing international appreciation of the increasing risk posed by natural hazard events acknowledges the effects that climate change and increasingly vulnerable populations will have on future costs and casualties of disasters. As concerns about the impacts of natural hazard events increase, researchers and practitioners are interested in identifying effective processes to build individual and community resilience. To date, despite resources, time and effort being made by governments and NGOs to ...
Tópico(s): Seismology and Earthquake Studies
2021 - Elsevier BV | International Journal of Disaster Risk Reduction
K. Ancy, C. Vijilvani, M. R. Bindhu, Sagala Bai, Khalid S. Almaary, Turki M. Dawoud, Ayman Mubarak, Mohammed Sulaiman Alfadul,
The disintegration of natural water sources signals out the scarcity of adam’s ale and will be hurdle for the human physical state. So it is necessary to decrease waste loads and hence pressure on the ecology for the sustainability of fishery and dye industry. Herein, TiO2 nanoparticles doped with Sn and F are synthesized and the influence of simultaneous doping on the optical, surface morphological, structural, photocatalytic and antibacterial activities are investigated. Doping of TiO2 with Sn ...
Tópico(s): Advanced Nanomaterials in Catalysis
2021 - Elsevier BV | Chemosphere
Nurudeen Yekeen, Tan Xin Kun, Ahmed Al‐Yaseri, Farad Sagala, Ahmad Kamal Idris,
The stability of CO2-foam stabilized via the synergy of nanoparticles and surfactants at downhole conditions is strongly affected by different process parameters such as temperature, CO2 state, nanoparticles concentration, as well as resident brine and oil in the reservoir. Influence of critical parameters on static and dynamic stability of nanoparticles-surfactant stabilized CO2-foam at sub-critical and super-critical conditions was investigated in this study. Firstly, extensive static and dynamic ...
Tópico(s): Hydrocarbon exploration and reservoir analysis
2021 - Elsevier BV | Journal of Molecular Liquids
Gele Teri, Na Li, Sagala Bai, E. Namila, Menghe Baiyin,
Two novel selenidostannates were solvothermally synthesized and compound 2 displays a unique 3-D open frame structure.
Tópico(s): Iron-based superconductors research
2021 - Royal Society of Chemistry | CrystEngComm
Farad Sagala, Afif Hethnawi, Nashaat N. Nassar,
During the production life of the reservoir, wettability alteration from an oil-wet to a strongly water-wet condition and/or lowering the interfacial tension (IFT) between the water and oil phases is required at various stages to enhance oil recovery (EOR). Several chemical agents as potential wettability modifiers (e.g., surfactants and polymers) have been regarded and widely used in oil-wet systems. Recently, various nano-fluids, prepared by dispersing nanoparticles in brine solutions or solvents, ...
Tópico(s): Hydrocarbon exploration and reservoir analysis
2020 - Elsevier BV | Fuel
Hoong Chen Teo, Alex M. Lechner, Saut Sagala, Ahimsa Campos‐Arceiz,
Indonesia’s new planned capital in East Kalimantan is being touted as a “smart, green, beautiful and sustainable city” but has stoked fears of massive environmental damage to the island of Borneo, one of the world’s most important biodiversity hotspots and carbon sinks. Precedents of other planned capitals can contribute to an understanding of the potential long-term impacts of Indonesia’s new capital. We used historical nighttime lights to quantitatively assess the spatial growth footprint of 12 ...
Tópico(s): Urban Transport and Accessibility
2020 - Multidisciplinary Digital Publishing Institute | Land
Stephen Sutton, Douglas Paton, Petra Buergelt, Saut Sagala, Ella Meilianda,
As projections about the number and scale of natural hazard events and their impact on human populations grow, increasing attention is being paid to developing effective means for preparing for and mitigating those impacts. At the same time there is an emerging understanding that gradual and incremental changes in disaster risk reduction (DRR) will not adequately meet the future needs of vulnerable populations. Transformational changes have been identified as a necessary requirement to avoid ongoing ...
Tópico(s): Disaster Management and Resilience
2020 - Multidisciplinary Digital Publishing Institute | International Journal of Environmental Research and Public Health
Gavin Brent Sullivan, Saut Sagala,
Tópico(s): Disaster Management and Resilience
2020 - Elsevier BV | International Journal of Disaster Risk Reduction
Alex M. Lechner, Rachel L. Gomes, Lucélia Rodrigues, Matthew J. Ashfold, Sivathass Bannir Selvam, Ee Phin Wong, Christopher M. Raymond, Alexandra Zieritz, Kong Wah Sing, Peter Moug, Lawal Billa, Saut Sagala, Ali Cheshmehzangi, Karen Lourdes, Badrul Azhar, Ruzana Sanusi, Christopher D. Ives, Yu-Ting Tang, David T. Tan, Faith Ka Shun Chan, Tapan Kumar Nath, Nur Aliya Binti Sabarudin, Sarah E. Metcalfe, Natalie Marie Gulsrud, Mark Schuerch, Ahimsa Campos‐Arceiz, Mark G. Macklin, Chris Gibbins,
Abstract Low- and middle-income countries in Southeast and East Asia face a range of challenges related to the rapid pace of urbanisation in the region, the scale of pollution, climate change, loss of ecosystem services and associated difficulties for ecological restoration. Possible pathways towards a more sustainable future lie in the applications of nature-based solutions (NBS). However, there is relatively little literature on the application of NBS in the region, particularly Southeast Asia. ...
Tópico(s): Coastal wetland ecosystem dynamics
2020 - UWA Publishing | Blue-Green Systems
Farad Sagala, Afif Hethnawi, Nashaat N. Nassar,
A large number of researchers have endeavored to delineate the effects of injecting brine with a low ionic strength in oil reservoirs in the past decade. However, we still cannot conclude the overriding mechanism(s) of recovering oil from this technique. Even with a detailed review of the literature, the effect of low-salinity water flooding (LSWF) shows that a bewildering array of conflicting results have been reported. From the physicochemical point of view, understanding how brine and oil chemistry ...
Tópico(s): Hydraulic Fracturing and Reservoir Analysis
2020 - American Chemical Society | Industrial & Engineering Chemistry Research
Hanif Amrulloh, Wasinton Simanjuntak, Rudy Situmeang, Sophia L. Sagala, Rikha Bramawanto, Awalul Fatiqin, Ridho Nahrowi, Mai Zuniati,
In this study, nano-size MgO was synthesized from seawater and bittern obtained from local salt industry in Pamekasan, Madura, Indonesia, using electrochemical method. The main purpose was to study the effects of seawater pre-concentration and bittern dilution on the structure and morphology of the MgO nanoparticles produced. Electrochemical process was performed in a two-compartment electrochemical cell with a fixed potential of 18 V, for 4 h at ambient temperature, and without adjusting the pH. ...
Tópico(s): Bone Tissue Engineering Materials
2020 - Taylor & Francis | Inorganic and Nano-Metal Chemistry
Moussa Taleb, Farad Sagala, Afif Hethnawi, Nashaat N. Nassar,
Recently, the application of nanoparticles for enhancing oil recovery (EOR) in carbonate reservoirs has received great attention from various researchers across the oil and gas industry. In contrast to sandstone reservoirs, carbonates are naturally neutral wet or preferentially oil wet and, therefore, the recovery of oil from these reservoirs by waterflooding techniques is relatively low and inefficient. Hence, the addition of chemical agents can modify rock wettability and increase the efficiency ...
Tópico(s): Hydraulic Fracturing and Reservoir Analysis
2020 - American Chemical Society | Energy & Fuels
Imelda Regina Pellokila, Novalina Sagala,
Hutan mangrove di kawasan Pantai Oesapa Barat memiliki keunikan daya tarik tersendiri karena menawarkan atraksi wisata yang berbeda dari objek wisata lainya yaitu hutan mangrove dan hingga saat ini masih merupakan satu-satunya ekowisata hutan mangrove yang ada di Kota Kupang, yang dikelola oleh pemerintah kota kupang, dengan memberdayakan masyarakat lokal sebagai pelaku utama dalam menyajikan atraksi wisata yang ada. Namun seiring berjalanya waktu pengunjung yang datang mengunjungi objek wisata ...
Tópico(s): Agriculture and Agroindustry Studies
2019 - | Tourism - Jurnal Pariwisata
Nursyafiqah S. Heshamudin, Allan Katende, Halimatun A. Rashid, Issham Ismail, Farad Sagala, Ariffin Samsuri,
Field experience has shown that the inefficient transport of small cuttings is a main factor contributing to excessive drag and torque during the drilling of a deviated hole; however, very little is known about the transport behavior of small cuttings. This experimental study investigates the effect of different polypropylene bead concentrations in water-based mud (WBM) on hole cleaning, along with the effects of cutting size, drill pipe rotation, and hole inclination angle. A total of 160 runs were ...
Tópico(s): Tunneling and Rock Mechanics
2019 - Elsevier BV | Journal of Petroleum Science and Engineering
Low-salinity water flooding (LSW) is a promising new technique for enhancing oil recovery (EOR) in both sandstone and carbonate reservoirs. The potential of LSW has drawn the attention of the oil industry in the past decade. Along with the few successful field applications of LSW, various studies in this field in recent years have been conducted mainly at the lab scale. The main objective of this critical review was to investigate the potential of this EOR technique in improving oil recovery and the ...
Tópico(s): Hydrocarbon exploration and reservoir analysis
2019 - Elsevier BV | Journal of Molecular Liquids
Rumadani Sagala, Prasart Nuangchalerm, Antomi Saregar, R. Ahmad Zaky El Islami,
The negative nature of human damages the earth by destroying nature and the environment, which ultimately causes global warming. One solution to the environmental problem of global warming is to educate students from an early age to have ecological awareness and not to destroy the earth. The purpose of this study is to find things that need to be developed in environmentally-friendly education as a solution to global warming. This type of research is descriptive qualitative. The research was conducted ...
Tópico(s): Educational Methods and Outcomes
2019 - Journal for the Education of Gifted Young Scientists | Journal for the Education of Gifted Young Scientists
Rumadani Sagala, Rofiqul Umam, Andi Thahır, Antomi Saregar, Indah Wardani,
<p style="text-align:justify">The purpose of this research is to describe the effectiveness of STEM on the physics concepts understanding seen from gender differences. The research method used is a type of quasi-experimental design with 2x2 factorial design and saturated sampling technique. The data collecting technique used a tested method to see the results of students’ concept understanding. Hypothesis testing was done using two-way ANOVA 2 x 2 factorial designs. The results of the study ...
Tópico(s): STEM Education
2019 - RU Publications | European Journal of Educational Research
Allan Katende, B. Segar, Issham Ismail, Farad Sagala, Halimatun Saadiah, A. Samsuri,
Abstract Hole cleaning is always a problem, particularly during drilling operations, and drilling fluid plays an important role in transporting drill cuttings through an annular section of wellbore to the surface. To transport the cuttings, a water-based mud with added polypropylene beads was selected since it is environmentally friendly and cost efficient. The polypropylene beads help to transport cuttings by providing an additional buoyancy force that lifts the cuttings to the surface via the ...
Tópico(s): Geotechnical Engineering and Underground Structures
2019 - Springer Nature | Journal of Petroleum Exploration and Production Technology
Ade Andriani, I Dewi, Prihatin Ningsih Sagala,
In general, this study aims to improve the learning quality in the mathematics education department of State University of Medan to welcoming the industrial revolution 4.0. Specifically, the aim is to develop blended learning media using the Mentimeter application to improve students' creative thinking skills. This type of research is research and development. This development research refers to the Thiagarajan theory which consists of four stages: define, design, develop and disseminate. The instrument ...
Tópico(s): Technology-Enhanced Education Studies
2019 - IOP Publishing | Journal of Physics Conference Series
Allan Katende, Natalie Vanessa Boyou, Issham Ismail, Derek Z. Chung, Farad Sagala, Norhafizuddin Hussein, Muhamad S. Ismail,
Oil-based mud (OBM), a non-Newtonian fluid, is known for its superior performance in drilling complex wells as well as combating potential drilling complications. However, the good performance may degrade under certain circumstances especially because of the impact of chemical instability at an elevated temperature. The same phenomenon occurs for water-based mud (WBM) when it is used in drilling under high temperature conditions. To prevent this degradation from occurring, numerous studies on utilizing ...
Tópico(s): Grouting, Rheology, and Soil Mechanics
2019 - Elsevier BV | Colloids and Surfaces A Physicochemical and Engineering Aspects
Prihatin Ningsih Sagala, Ade Andriani,
This research aims at producing assessment instruments of Mathematics in the form of HOTS questions of Probability Theory subject based Bloom's Taxonomy. Research Design used is Research and Development. This research refers to the Tessmer progressing model which consists of two phases: a preliminary and formative evaluation. The questions are improved based on their validity, practicality, and effectiveness. The prototype I question as the beginning design is validated by 3 experts (expert review) ...
Tópico(s): Mathematics Education and Pedagogy
2019 - IOP Publishing | Journal of Physics Conference Series
Farad Sagala, Tatiana Montoya, Afif Hethnawi, Gerardo Vitale, Nashaat N. Nassar,
Nanoparticles (NPs) have recently gained great attention as effective agents for enhanced oil recovery (EOR) applications, especially at ambient temperatures. Nevertheless, harsh conditions are needed to synthesize them and many tend to lack stability, exhibiting strong limitations in EOR application. As a solution, many researchers have used silica nanomaterials and grafted them with various agents to enhance their stability and alter their functionality. However, altering their overall functionality ...
Tópico(s): Hydrocarbon exploration and reservoir analysis
2019 - American Chemical Society | Energy & Fuels