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Showing result 1 - 5 of 57 essays matching the above criteria.

  1. 1. Experimental Study of Flow Fields in Moving Bed Biofilm Reactors

    University essay from KTH/Hållbar utveckling, miljövetenskap och teknik

    Author : Shea Nee Chew; [2023]
    Keywords : Moving bed biofilm reactors; Biofilm carriers; Mechanical mixing; Mixer configurations; Carrier mixing; Biofilmsreaktorer med rörlig bädd; Biofilmsbärare; Mekanisk blandning; Blandarkonfigurationer; Bärarblandning;

    Abstract : With the rise in global energy prices, as well as energy consumption being the largest source of greenhouse gas emissions, biofilm-based systems utilized for wastewater treatment, such as moving bed biofilm reactors (MBBRs), have grown in popularity for their lower energy consumption compared to conventional activated sludge processes. However, this technology requires large amounts of energy to constantly distribute and suspend its biofilm carrier within the reactor by either aerators or mechanical mixers. READ MORE

  3. 2. 3D CFD Simulations of Hydrogen Engine Combustion

    University essay from Lunds universitet/Institutionen för energivetenskaper

    Author : Hao Liu; [2023]
    Keywords : Technology and Engineering;

    Abstract : With the trend of decarbonization, the transport sector is exploring possibilities of fossil fuel free solutions. Hydrogen can be a potential fuel for future engine applications. In this work, the concept of H2 HPDI is investigated, where a pilot diesel injection ignites the hydrogen jet. READ MORE

  4. 3. Redeveloping a mixing system in a biomedical device to improve system control and increase its intelligence and effectiveness : Redeveloping a mixing mechanism using ESP32, TMC5130, Bluetooth and CAN-bus

    University essay from Mälardalens universitet/Akademin för innovation, design och teknik

    Author : Aref Bahtiti; [2023]
    Keywords : CAN-bus; Bluetooth classic; Stepper motor; TMC5130; ESP32; Open loop system; Smartphone application;

    Abstract : Biogas is a renewable energy source produced by decomposing organic matter in the absence of oxygen. Without oxygen, organic matter is broken down in this process, producing a mixture of gases that may be used for a variety of tasks, such as heating, cooking, and producing power. READ MORE

  5. 4. Quantum state tomography of attosecond electron wavepackets

    University essay from Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Author : Ron Demjaha; [2022]
    Keywords : quantum physics; quantum state tomography; atomic physics; quantum optics; density matrix; entanglement; state mixing; fano resonances; two-photon absorption; Physics and Astronomy;

    Abstract : In this master thesis, a broad theoretical description is done of a novel quantum state tomography protocol called KRAKEN. This protocol is meant for the determination of the density matrix of an electronic state created by absorption of XUV radiation in the vicinity of a Fano resonance. At first, a description of the KRAKEN protocol is provided. READ MORE

  6. 5. Sustainable concrete bridges : An investigation of possible measures to reduce the climate impact

    University essay from Luleå tekniska universitet/Byggkonstruktion och brand

    Author : Daniel Hugh; [2022]
    Keywords : Bridges; CO2; emission; cement; reinforcement; SCM; sustainability.;

    Abstract : The need of building new bridges is always existing in relation with the increase of infrastructureand transport needs. Bridge constructions have traditionally been associated with highconsumption of resources and large greenhouse gas emissions. READ MORE