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 ...

The rapid oxidation of carbon black (CB) is a major drawback for its use as a catalyst support in polymer electrolyte fuel cells. Here, we synthesize poly[2,20 -(4,40 -bipyridine)-5,50 -bibenzimidazole] (BiPyPBI) as a conducting polymer and use it to functionalize the surface of CB and homogenously anchor platinum metal nanoparticles (Pt-NPs) on a CB surface. The as-prepared materials were ...

Verden står ovenfor store klimaendringer og klimagassmengden fortsetter å øke. For å begrense økning av gjennomsnittstemperaturen må tiltak iverksettes for å redusere utslippene. Betong er det mest anvendte byggematerialet i verden og det brukes dobbelt så mye betong enn andre byggematerialer til sammen. Sementproduksjon antas å bidra til 7-8 prosent av klimagassutslipp på verdensbasis. Betong ...

I den norske byggebransjen i dag er det lite samsvar mellom tilbud og etterspørsel av boliger, og det er dermed behov for økt effektivisering av byggebransjen. Prefabrikasjon som byggemetode har potensiale til å bidra til å øke effektiviteten i bygg- og anleggsnæringen, sett opp mot tradisjonell plassbygd metode. Denne artikkelen har dermed gjennomført en sammenligning av de positive og negative ...

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 ...

Denne oppgaven er en studie om radon i eksisterende bygninger med en casestudie. I forkant av utarbeidelse og utførelse av en tiltakspakke, ble det gjort en litteraturstudie innenfor temaet om radon, situasjonen i Norge og anbefalte tiltak for å redusere radonnivåene i eksisterende boliger. Casestudien omhandler en enebolig i Beisfjord, Narvik kommune. Det har blitt utført bytte av innvendig radonbrønn ...

Alternative to traditional concrete, sustainable concrete reduces cement content, waste management issues, and CO2 emissions. To achieve sustainable concrete, waste materials can be used as supplementary cementitious materials (SCMs) to partially replace cement. Fly ash, ground-granulated blast furnace slag, and silica fume have been heavily studied as SCMs. However, due to the retirement of coal-fired ...

Microbial fuel cells (MFC) are an emerging technology for wastewater treatment that utilizes the metabolism of microorganisms to generate electricity from the organic matter present in water directly. The principle of MFC is the same as hydrogen fuel cell and has three main components (i.e., anode, cathode, and proton exchange membrane). The membrane separates the anode and cathode chambers and ...

In response to the increasing demand for construction informatics (CI) expertise, universities in the Nordic countries have developed new educational offers. This study explores how CI related education is being delivered by three different universities, two in Norway and one in Sweden. By comparing curricula and interviewing CI teachers, this paper contributes to the recent debate on the international ...

Technology and design is seen by many as having a potential for students to work with science and mathematics in practical contexts. The view is particularly evident in the Norwegian curriculum, where technology and design is defined as an interdisciplinary topic involving Science, Mathematics and Art & Crafts. This paper reports from a video study of the use of mathematics and science in student ...