Recent additions

  • Parametric Sensitivity of CSTBRs for Lactobacillus casei: Normalized Sensitivity Analysis 

    Das, Subhashis; Calay, Rajnish K; Chowdhury, Ranjana (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-18)
    In this paper, a sensitivity analysis of a continuous stirred tank bioreactor (CSTBR) was conducted to determine a parametrically sensitive regime. The growth of a lactic acid bacterium, namely, <i>Lactobacillus casei</i>, in a pH-controlled CSTBR was considered as a process model. Normalized objective sensitivities of the minimum pH were determined with respect to input parameters. A generalized ...
  • Product Inhibition of Biological Hydrogen Production in Batch Reactors 

    Das, Subhashis; Calay, Rajnish K; Chowdhury, Ranjana; Nath, kaustav; Eregno, Fasil (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-12)
    In this paper, the inhibitory effects of added hydrogen in reactor headspace on fermentative hydrogen production from acidogenesis of glucose by a bacterium, Clostridium acetobutylicum, was investigated experimentally in a batch reactor. It was observed that hydrogen itself became an acute inhibitor of hydrogen production if it accumulated excessively in the reactor headspace. A mathematical model ...
  • Fremtidens bygningsmaterialer 

    Gjerde, Klaus (Master thesis; Mastergradsoppgave, 2019-06-07)
    Bakgrunnen for oppgaven har vært å undersøke fremtidige bygningsmaterialer. Her er isolasjonsmaterialer og konstruksjonsmaterialer som betong, stål og massivtre gjennomgått. Det har i tillegg vært gjennomført et caseprosjekt hvor gjenbrukspotensialet for en bygning brukt i caseprosjektet har blitt vurdert. Videre ble livsløpsvurderinger for bygningen i caseprosjektet vurdert opp mot en tilsvarende ...
  • Kontroll av FDVU-dokumentasjon og sammenheng med byggskader. Modell for kontroll av forvaltning-, drift-, og vedlikeholdsdokumentasjon i byggesaker, samt en vurdering av sammenheng mellom byggeskader og manglende eller ufullstendig FDVU-dokumentasjon 

    Alsen, Aleksander (Master thesis; Mastergradsoppgave, 2019-06-07)
    Missing or incomplete documentation for management, operation, and maintenance can become a problem in relation to both cost and quality. This thesis presents demands and responsible roles in given such documentation and uses the new standard SN/TS 3456:2018 Documentation for management, operations, maintenance and development (FDVU-documentation) to prepare a checklist/control-form for this ...
  • 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 ...
  • Numerical study on the ventilation performance of a livestock house built in porous panels in Cold Regions 

    Mustafa, Mohamad; Xu, Yizhong; Calay, Rajnish K; Sørensen, Bjørn Reidar (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11)
    This paper presents a numerical prediction on the assessment of natural ventilation on a livestock house built in porous panels, aided by Computational Fluid Dynamics techniques. A typical climatic environment in Cold Regions was taken into consideration. The ventilation performances have been assessed by the distribution of indoor air velocity, turbulence intensity and local mean age of air through ...
  • Numerical study on the ventilation performance of a livestock house built in porous panels in Cold Regions 

    Xu, Yizhong; Mustafa, Mohamad; Calay, Rajnish K; Sørensen, Bjørn Reidar (Journal article; Tidsskriftartikkel; Peer reviewed, 2019)
    This paper presents a numerical prediction on the assessment of natural ventilation on a livestock house built in porous panels, aided by Computational Fluid Dynamics techniques. A typical climatic environment in Cold Regions was taken into consideration. The ventilation performances have been assessed by the distribution of indoor air velocity, turbulence intensity and local mean age of air through ...
  • Feasibility study for utilization of solar energy in the arctic areas 

    Tamrakar, Stutee; Mustafa, Mohamad; Riise, Raymond (Journal article; Tidsskriftartikkel; Peer reviewed, 2019)
    This research investigates a solar thermal system and a solar photovoltaic system which produces local energy, by incoming solar radiation, to meet the energy consumption demand of a residential building in the arctic region. The study on the use of the solar systems in the arctic areas is rare and often doubted. So, to analyze the potential of solar energy, a study case of an existing building block ...
  • Ventilation and environmental control of underground spaces: A short review 

    Li, Angui; Kosonen, Risto; Melikov, Arsen; Yang, Bin; Olofsson, Thomas; Sørensen, Bjørn Reidar; Zhang, Linhua; Cui, Ping; Han, Ou (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-13)
    More and more underground spaces were used in 21st century because of rapid urbanization, traffic problems, etc. Underground city, metro, tunnel, mine, industrial and agriculture engineering, civil air defence engineering need large underground spaces. Underground spaces with different thermal, ventilation and lighting environments may cause comfort, health and safety problems. Concrete problems ...
  • Surface Functionalization of Carbon Nanotubes for Energy Applications 

    Berber, Mohamaed; Hafez, Inas H.; Mustafa, Mohamad Y. (Peer reviewed; Chapter, 2018-05-05)
    Carbon nanotubes (CNTs) are receiving a great deal of attention as a catalyst support for different energy applications, due to their high surface area and high conductivity. Recent literature studies have shown that the application of CNTs mainly depends on their surface functionalization process. Typically, pristine CNTs (as produced) have no functional groups, which is usually considered as an ...
  • Effekt av basaltfiber for betongkvalitet = Effect of basalt fiber for quality of concrete 

    Ha, Duy Quang (Master thesis; Mastergradsoppgave, 2019-06-27)
    The need of concrete is getting more and more, experts have researched new materials to improve the good properties of concrete. Basalt fiber is a new additive in the concrete industry, so researches on basalt fiber concrete is not many. Previous research results have shown positive effects of basalt fiber on the mechanical strengths of the concrete. This task is performed by experiments to confirm ...
  • Samspillskontrakter – en vei å forene ulike interesser 

    Nielsen, Håvard Johannes (Master thesis; Mastergradsoppgave, 2019-06-27)
    Samspill i norsk bygg- og anleggsbransje øker i omfang. Hensikten med samspillsmodellene er å sørge for mer innovasjon i byggeprosjekter, samtidig som modellen skal motivere til kostnadseffektive løsninger. Tema for denne oppgaven er hvordan samspill kan nyttiggjøres i byggeprosjekter, og hvilke utfordringer og fordeler samspill kan medføre for byggherre. Oppgaven tar også for seg karakteristiske ...
  • Spesifikke energiforsyningskonsepter i Smart Arctic Building 

    Li, Lin (Master thesis; Mastergradsoppgave, 2019-06-27)
    I oppgaven utredes det spesifikk energiforsyningskonsepter og energikombinasjoner som gir lavest energibruk. Oppgaven ser på to eldre lavboligblokker som ligger i Beisfjordveien 88 og 90, som eies av Ofoten Midt-Troms Boligbyggerlag. Bygget har i dag lite isolasjon, og elektrisk energiforsyning som medfører stort varmetap og høyt energiforbruk på ca. 216 kWh/m2. Rehabiliteringen av blokker omfatter ...
  • Effekt av Idrocrete KR 1000 på betongporestruktur og permeabilitet (Effect of Idrocrete WP 1000 on concrete pore structure and permeability) 

    Onyango Orony, Elvis (Master thesis; Mastergradsoppgave, 2019-06-27)
    This thesis includes a literature study where the focus is concrete theory and how additives affect the durability of the concrete. In addition, there will be a practical part where the largest part of the task will undergo mainly on the concrete laboratory. Two different mixtures will be mixed. A reference mixture (Ref.B35) and another mixtue with the same recipe, but this will contain an additive ...
  • Byggetekniske løsninger for kalde og arktiske strøk (Building design & solutions for cold and arctic environment) 

    Sara, Bernt Ailu Utsi; Blegeberg, Magnus Moland (Master thesis; Mastergradsoppgave, 2019-06-27)
    In recent years, there has been an increacing focus on environmental issues and the ongoing climate change. With predictions of increasing rainfall and more extreme weather, this poses a greater risk of damage to buildings, which again places stricter requirements on construction details. In Norway, there has been focus on construction in cold and arctic regions, and the impact on existing buildings ...
  • Kartlegging av inneklima på Skistua Barneskole (A study of the indoor climate at Skistua elementary school) 

    Lohne, Olav Nilsen; Thorrud, Lars (Master thesis; Mastergradsoppgave, 2019-06-27)
    The purpose of the measurements was to document whether the school had an acceptable indoor climate. An ''ørebro''-examination was performed as an indicator of which parameters might be appropriate to investigate. Using the survey, measurements of CO2, air temperature, PMV, relative humidity and airflow were made. The results that emerged showed that the school had a generally acceptable indoor ...
  • Bygningsfysiske utfordringer i forbindelse med kalde garasjeanlegg 

    Pettersen, Emil; Pettersen, Bjørn Anders (Master thesis; Mastergradsoppgave, 2019-06-26)
    "Årlig koster byggeskader samfunnet 17 milliarder, gjennom undersøkelser utført av SINTEF byggforsk er det konkludert med at 65-70 prosent av disse byggeskadene skyldes fukt (TU, 2017). Bygge skader som dette har resultert i at Plan og bygningsloven (PBL) og Direktoratet for byggkvalitet (DIBK) utarbeidet en ny forskrift som trådte i kraft pr. 1.1.2013 som ett tiltak på å redusere bygge skader. ...
  • Kritiske faktorer for effektivisering ved bygging av småhus. Hvordan kan småhusbransjen benytte digitalisering og industrialisering til å effektivisere boligbyggingen og redusere reklamasjoner? 

    Ådnanes, Vegard (Master thesis; Mastergradsoppgave, 2019-06-26)
    Småhusbransjen er et segment i bygge- og anleggsbransjen, en bransje som mellom år 2000 og 2016 opplevde en nedgang i effektivitet og produktivitet på 10 prosent. Denne nedgangen skyldes mange forskjellige faktorer, men blant annet ulike byggemetoder, dårlig planlegging og logistikk har ført til at det tar lengre tid å bygge en bolig i dag. Økt fokus på effektivisering ved boligbygging er et populært ...
  • Possibility study for utilization of solar energy in Arctic areas 

    Tamrakar, Stutee (Master thesis; Mastergradsoppgave, 2019-06-26)
    This thesis investigates a solar thermal system and a solar photovoltaic system which produces local energy by incoming solar radiation to meet the energy consumption demand of a residential building in the arctic region. An existing building block in Narvik, within the sub-arctic region, was taken as study case to analyze the potential of solar energy.
  • Energianalyse av vannbåren varmesystem - Omlegging fra 5 til 3 rørssystem 

    Kulvik, Stein Georg (Master thesis; Mastergradsoppgave, 2019-06-26)
    I samarbeid med oppdragsgiver K.Lund, ble det under dette prosjektet utført en analyse av det indirekte 3 rørssystemet ved Kanalen i Trondheim. Målet med oppgaven var å se på om det er store differanser på investeringskostnader og varmetap i de forskjellige systemene for vannbåren varme. Med holdepunkter i referanseanlegget ble det gjort analyse og simuleringer av de andre systemene. Resultatene ...

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