Now showing items 1-20 of 65

    • Artificial Thawing of Frozen Ground: A Review 

      Ngo, Phan Thu Huong; Sveen, Svein-Erik; Gjerløw, Eirik (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-27)
      Understanding the freezing and thawing processes in porous media such as soils is important, especially in regions experiencing seasonal frost or permafrost. These processes have a wide range of implications as diverse as how to maintain the structural integrity of roads, railways, pipelines, and buildings, to when to plant seeds during the growth season. Thawing of frozen ground is the opposite ...
    • Assessing shielding material Performance: Benchmarking of Monte Carlo codes for oil shale and Basalt-Boron fiber concretes Hando Tohver a,* , Andrius Slavickas b , Maryna Holiuk c , Andrejs Krasn¸ i 

      Tohver, Hando; Motlep, Riho; Krasnikovs, Andrejs; Novakova, Iveta; Gulik, Volodymyr; Slavickas, Andrius; Holiuk, Maryna; Vaišnoras, Mindaugas (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-12)
      Cement-based concretes are commonly used for managing radioactive waste due to their low cost and radiation shielding properties. However, the potential of using oil shale ash as an additive in waste packaging material has been overlooked. This study focuses on benchmarking and developing a Monte Carlo based modeling methodology using multiple transport codes (MCNP, SERPENT, SCALE, OpenMC, and ...
    • Biogas from Organic Waste - A Case Study 

      Mustafa, Mohamad; Calay, Rajnish K; Roman, Elisabeth (Peer reviewed; Journal article; Tidsskriftsartikkel, 2016-07-01)
      This paper presents a case study to investigate the potential for upgrade of a bio-waste treatment plant. The paper also discusses development potentials in order to optimize the plant for maximum energy and environmental benefits. Data gathered over two consecutive years about the production of biogas, energy and bio-rest were considered and mass balance analysis of inputs and outputs of the ...
    • Bridging Law Application to Fracture of Fiber Concrete Containing Oil Shale Ash 

      Upnere, Sabine; Novakova, Iveta; Jekabsons, Normunds; Krasnikovs, Andrejs; Macanovskis, Arturs (Journal article; Tidsskriftartikkel, 2023-07-23)
      Concrete is a widely used material in various industries, including hazardous waste management. At the same time, its production creates a significant carbon footprint. Therefore, intensive research is being conducted to create more eco-friendly concrete, for example, partially replacing cement with by-products such as oil shale ash (OSA) or improving properties by adding dispersed fibers such as ...
    • Circular economy: Challenges and opportunities in the construction sector of Kazakhstan 

      Torgautov, Beibut; Zhanabayev, Asset; Tleuken, Aidana; Turkyilmaz, Ali; Mustafa, Mohammad; Karaca, Ferhat (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-24)
      The circular economy in the construction sector in emerging economies is one of the most promising concepts that aims to keep the value of the construction materials and structures as long as possible. The construction industry is rapidly developing in Kazakhstan with a yearly increase in projects. This research paper investigates the construction sector in Kazakhstan in terms of the potential ...
    • Comparison of “Zero Emission” Vehicles with Petrol and Hybrid Cars in Terms of Total CO2 Release—A Case Study for Romania, Poland, Norway and Germany 

      Lieutenant, Klaus; Borissova, Ana Vassileva; Mustafa, Mohamad; McCarthy, Nick; Iordache, Ioan (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-10-27)
      The authors compare the energy consumption and CO<sub>2</sub> emissions from vehicles using internal combustion engines (ICE), battery electric vehicles (BEV), fuel cell electric vehicles (FCEV), and two types of hybrid vehicles, BEV‐ICE hybrid and BEV‐FCEV hybrid. This paper considers several scenarios for four countries’ electricity production from primary energy sources to estimate total ...
    • A Comprehensive Summary of Available Legislation and Practices in Demolition and Construction & Demolition Waste Management in the Arctic Region 

      Novakova, Iveta; Drozdyuk, Tatiana; Ohenoja, Katja; Ayzenshtadt, Arcady; Arntsen, Bård; Perumal, Priyadharshini; Dyvesveen, Martin Skjerve (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-17)
      The need for better natural resource use is currently increasingly recognised, and high emphasis is given to the circularity of building materials and the reduction of activities with negative environmental impact. Legislation, guidelines, and other documentation play an important role in improving demolition activities and construction and demolition waste (CDW) management. Good practices in CDW ...
    • Construction professionals’ perspectives on drivers and barriers of sustainable construction 

      Tokbolat, Serik; Karaca, Ferhat; Durdyev, Serdar; Calay, Rajnish K (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-05)
      With the associated environmental challenges and unsustainable patterns of construction, there is also notable awareness and willingness among the state bodies to adopt sustainability measures and practices in Kazakhstan. This study explores the drivers of and barriers inhibiting the adoption of sustainability paradigm in the construction context of Kazakhstan. The drivers and barriers were validated ...
    • Control of Airborne Noise Generated in the Cavities of a T-Slotted Aluminum Cylindrical Column 

      Mustafa, Mohamad Y.; Yizhong, Xu; Sørensen, Bjørn Reidar; Santos, José; Al-Mahadin, Aziz (Peer reviewed; Chapter, 2018-06-11)
      This paper presents a study of airborne noise generated by a T-slotted cylindrical aluminum hollow column with six slots of the type used for the construction of communication towers. Noise is a very distracting phenomena and an environmental concern caused by various sources. Noise pollution is becoming more severe with the introduction of massive human activities and the use of heavy machineries, ...
    • Design basis for Arctic infrastructure facilities 

      Myrmel, Liv Brita Hætta; Gudmestad, Ove Tobias (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-18)
      A discussion related to the selection of a proper design basis for Arctic infrastructure facilities is presented. The design basis, which must be sufficiently robust to ensure safe operations of the facilities during their planned lifetime, should include relevant information available from the local and indigenous people of the area. The need to properly document all data and assumptions made ...
    • Design of water shock tube for testing shell materials 

      Ji, Hongjuan; Mustafa, Mohamad; Khawaja, Hassan Abbas; Ewan, Bruce C.; Moatamedi, Mojtaba (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-04-15)
      This paper presents design considerations for a shock tube experimental rig used to investigate the dynamic failure mechanisms of shell geometries subjected to water shock impact loading. In such setup, it is desirable that the drive pressure used within the tube can provide a wide range of impulsive loads on the test structures and some flexibility can be achieved on the applied pulse durations. ...
    • DEVELOPMENT OF METHOD AND CRITERIA FOR EVALUATION OF DRY-WASHING EFFICIENCY WITH RE-CON ZERO EVO 

      Novakova, Iveta; Norman, Sven-Henrik; Bista, Dipen (Chapter; Bokkapittel, 2022)
      Society recognises the need for the preservation of nature and the need for better resource utilisation. Integration of good practice in the building industry is mainly targeted at reducing or completely eliminating waste. One of the waste sources in the concrete industry is created in washing facilities and consists of returned concrete, washing water and cement slurry. Concrete trucks are washed ...
    • Effect of Microwave Radiation on the Compressive Strength of Solid Ceramic Brick 

      David, Průša; Karel, Šuhajda; Tomáš, Žajdlík; Kateřina, Svobodová; Stanislav, Šťastník; Klara, Hobzova; Venkrbec, Vaclav (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-13)
      Microwave radiation is widely utilized in construction practice, especially for drying building materials, remediating damp masonry, or sterilization of biotic pests that have infested building structures. The available scientific and technical literature reports that certain materials exposed to microwave radiation do not change their physical and mechanical properties, although this has not yet ...
    • Effect of pH, COD, and HRT on the Performance of Microbial Fuel Cell Using Synthetic Dairy Wastewater 

      Banerjee, Aritro; Calay, Rajnish K; Das, Subhashis (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-30)
      Microbial fuel cells (MFC) are emerging technologies that can produce electricity while treating wastewater. A series of tests were carried out to evaluate the efficiency of this technology for treating dairy wastewater (DWW). The experiments used Shewanella baltica as an exoelectrogen in a small single MFC to treat simulated DWW. The impacts of various operational factors, specifically pH, ...
    • Efficient Distributed Localization Algorithm for Ownership Identification of Reindeer Calf Using Wireless Sensor Networks 

      Mustafa, Mohamad; Morral Adell, Gemma; diengy, Ndeye Amy (Journal article; Tidsskriftartikkel, 2017)
      This paper presents a distributed algorithm for identifying the ownership of new-born reindeer calves using wireless sensor networks (WSNs). Reindeer are semi wild animals giving birth while in the wild. Although reindeer cows usually carry identification tags or signs of their owners, it is difficult to identify the ownership of the calves within a mixed herd. Currently, identification is performed ...
    • Enhanced performance of microbial fuel cells using electrochemically treated carbon felt anode 

      Poureshghi, Fatemeh; Calay, Rajnish K; Das, Subhashis (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-10)
      The microbial fuel cell (MFC) technology is emerging as an effective technology for wastewater treatment to remove and detect many pollutants and simultaneously generate power. The anode is an essential component for bacterial attachment and extracellular electron transfer (EET). Thus, anode performance is critical for improving an MFC system's overall performance. Materials that are electronically ...
    • Evaluating of melting-ice process in a vertical pipe with consideration of net sensible heat 

      Nguyen, Hung Thanh; Gjerløw, Eirik; Huynh, Minh-Thu T. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-19)
      In ice-melting process, motion of liquid–solid interface is complicated due to moving boundary, which is also called Stefan interface problem. Although the Stefan model has been widely utilized, it frequently overestimates the melting rate. In the present study, the net-sensible-heat of the phases are taken into account as an additional physical effect to the Stefan model for one-phase case and ...
    • Evaluation of optimal replacement of natural aggregates by recycled concrete aggregates to achieve sufficient durability 

      Novakova, Iveta; Sjåfjell, Jørgen J.; Venkrbec, Vaclav (Preprint; Manuskript, 2022)
      The use of recycled concrete aggregate (RCA) is one way to reduce the depletion of raw materials for the production of concrete. In this article RCA was tested and evaluated. Concrete with 25 to 80 % of RCA was examined in terms of its durability performance, particularly capillary absorption and shrinkage. Capillary absorption testing showed that RCA has better or identical results as the reference ...
    • Experimental Study of Power Generation and COD Removal Efficiency by Air Cathode Microbial Fuel Cell Using Shewanella baltica 20 

      Das, Subhashis; Calay, Rajnish K (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-05)
      Microbial fuel cells (MFCs) are a kind of bioreactor for generating electricity, facilitated by exoelectrogens while treating wastewater. The present article focuses on the performance of an air cathode plexiglass MFC in terms of chemical oxygen demand (COD) removal efficiency and power output by performing two sets of experiments. The proton exchange membrane and electrode materials were Nafion ...
    • Feasibility of Computational Fluid Dynamics for Analyzing Airflow around Porous Fences 

      Xu, Yizhong; Calay, Rajnish K; Mustafa, Mohamad (Journal article; Peer reviewed, 2019-01-19)
      This article presents using the computational fluid dynamics (CFD) modeling to analyze the flow around porous fences. The feasibility of applying 2D and 3D models was assessed with respect to corresponding wind tunnel experiments. Comparisons between the flow structures on leeward of the fence as predicted by CFD models and the wind tunnel measurements were discussed. Velocity values for the two ...