6,263 Works

3D Nanoscale imaging with FIB-SEM

Mikkel Ravh Boye Jensen, Kristian Mølhave & Rafal Wierzbicki
In this project I work on developing ways to use a FIB-SEM to create a 3D model of biological samples. The method can be used in several projects with Grøn Dyst angles and I here report on my work on imaging malaria infected blood cells which is essential for a deeper understanding of how the parasite might be targeted by medicine, and algae samples that are essential for ecotoxicologial studies and later will be used...

A golden future for oxidation reactions in the chemical industry

Jerrik Mielby, Anders Riisager & Søren Kegnæs
To develop a more sustainable chemical industry, there is an urgent need for more efficient and environmentally benign oxidation processes. Aerobic oxidation of alcohols is an emerging field in organic chemistry and represents a green and highly atom-efficient alternative to the methods often used in industry. Here, we show that supported gold nanoparticles form active and highly selective heterogeneous catalysts in a range of aerobic oxidations. The formation of imines by oxidative coupling of alcohols...

A Novel Process to Highly Improve the Bioethanol Production

Christoffer Norn & Johan Börjesson
In 2007 the bioethanol industry produced 24.5 billion liters of ethanol and 15.4 billion kg of distillers dried grain with solubles (DDGS). The market value of DDGS for livestock feeding is relatively low due to high contents of fibers, sulfur, phosphor, possible presence of mycotoxins and high batch variation. To address this problem I have developed a novel protease-based process for simultaneous pretreatment of fibers and protein extraction. Using optimized process conditions the total bioethanol...

Zero Valent Iron Nanoparticles – The solution for contaminated sites or another threat for health and environment induced by human activity

Radim Holub, Maren Lea Kirstein & Anders Baun
Contamination of soils and groudwater pose are a huge challenges technically and economically due to difficult accessibility of the polluted areas. The newest environmental remediation technology applied so far is the injection of nanoparticles like nano zero valent iron (nZVI) into contaminated sites. This technology provides a high cost efficiency and is very simple to apply in situ. The aim of this project is to investigate the effect of nZVI to the environment and human...

Wind Farm Controller

Örvar Sveinsson, Baldur Bjarnason, Hans Henrik Niemann, Niels Kjølstad Poulsen, Mikkel Ask Buur Bækgaard & Peter F. Odgaard
At present most wind farm controllers simply distribute power set point to the turbines evenly. The performance of the farm controller can be improved by utilizing the on-line measurements from each turbine in the farm. By reducing the power set point for the first rows of turbines in the up wind direction and thereby letting more wind through for the following turbines the wind can be utilized better. Preliminary analysis show an improvement in overall...

Ventilation strategies in residential buildings with focus on windows and energy consumption

Christoffer Plesner & Toke Rammer Nielsen
This master thesis presents results of energy performance for different ventilation strategies, where the results are attempted to be improved by implementing air flow windows to increase comfort and reduce energy consumption compared to more traditional ventilation types.

Super-light Structures

Birgit Astrid Pedersen, Kasper Laurits Krag Nielsen, Maria Skovgård Møller & Kristian Hertz
The project is based on the Vejlefjord bridge, which is a cantilever concrete bridge. The bridge functions as a part of the highway running from north to south in Jutland, running east of Vejle. It spans 1712m, is 26.7m wide and has 110m between the pillars. The main purpose of this project is to compare the original bridge with a similar bridge constructed in superlight concrete. The comparison is divided into two parts. First we...

Statistical analysis of data from a sustainable community development project in Vietnam

Charlotte Kampp Davidsen & Per Bruun Brockhoff
ADDA (Agricultural Development Denmark Asia) has been implementing a sustainable community development project, financed by Danida, in six different provinces of Vietnam since 2007 with the aim of achieving increased local agricultural production. The project has trained 15.400 maize farmers through the participatory Farmer Field Schools (FFS) where they were taught improved cultivation techniques along with the benefit of collaboration. The aim of the current project is to examine specific data from before and after...

Solar Tree (Out of competition)

Arnold Knott, Dorthe H. Lund, Thomas Andersen & Jens Martin Dandanell
The combination of art, green energy and environment was the motivation for building a “solar tree”. The tree consists of a mechanical basis built of construction steel surrounded by the wood of a real tree. The branches of a real tree, fixed to the trunk are holding seven big artificial leaves. On top of them, we mounted solar cells, which are capable of delivering energy to a power outlet, installed in the trunk of the...

Single Cell Protein from Landfill Gas

Deenesh Babi, Jason Price &
Municipal solid waste (MSW) landfills are one of the largest human-generated sources of methane emissions in the United States and other countries globally. Methane is believed to be a very potent greenhouse gas that is a key contributor to global climate change, over 21 times stronger than CO2. Methane also has a short (10-year) atmospheric life. Because methane is both potent and short-lived, reducing methane emissions from MSW landfills is one of the best ways...

Removal of Nitrous Oxides from Flue Gas – at the Forefront of Legislation

Helene Kolding & Rasmus Fehrmann
Flue gas emissions have had a major impact on our environment, both as greenhouse gasses and due to their acidification properties. Removal of NOx gasses is largely performed by the state-of-the-art SCR method. However, a common byproduct of the SCR reaction is N2O, which cannot be removed by the SCR catalyst. In this course, I have studied new and promising SCR catalysts as well as potent catalysts for efficient removal of N2O. By providing an...

Reengineering of Tietgen Kollegiet into a green building

Daniel Løvborg, Jakob Trier Holck, Jannie Bakkær Sørensen, Stig Birkemose & Christian Anker Hviid
Reengineering of Tietgen Kollegiet into a green building in terms of energy consumption and indoor climate.

Redesign of Pavilion

Jakob Borup Jakobsen, Jonas Bo Andersen, Line Kagenow Svenstrup, Mathias Rangel Wulff, Pia Michelsen, Stine Ellermann & Charlotte Scheutz
This project aims to make use of the progress within material utilization and recycling in a redesign of the traditional pavilion that are used at Roskilde Festival among other places. The festival participants leave the pavilions as trash after only seven days of use, which has a negative impact on the environment since the pavilions primary consist of metal and plastic. The vision of this project is to make an alternative to the traditional pavilion...

Photo-electro Catalytic Water Splitting over Pure and Modified Iron Oxide Thin Films

Martin Hangaard Hansen, Mathias Kjærgaard Christensen & Søren Dahl
Photo-catalysis offers the possibility to utilize solar energy to split water, thereby extracting chemical energy in the form of hydrogen. The general challenge is to synthesize a material with the right electronic and chemical properties for efficiently driving the process, while being sustainable in terms of stability and costs. The focus of this bachelor thesis is photo-electrocatalytic splitting of water on modified iron oxide thin films. Through various surface treatments and modification of thin film...

OroClean

Jakob Parslov, Jeanne Lønstrup, Lærke Holstebroe, Trine Duelund Torstved & Burt Swersey
30% of all mercury pollution in the world comes from small-scale mining. This causes severe health and environmental damages. To eliminate the need for mercury in artisanal mining we have created a small-scale centrifuge that can separate gold from silt without using any chemicals. To heighten the efficiency fluidizational principles are integrated. The centrifuge can be produced at a low cost, which makes it feasible to set up a sustainable business model that will generate...

Optimization of Trailer Transport

Kasper Bislev Kallestrup & Jesper Larsen
20% of Europe’s GHG emissions come from road transportation. Freight transport energy consumption, and thus emission levels, is tightly coupled to GDP. So if Europe seeks to dramatically reduce emissions without sacrificing wealth, it is crucial to address the issue of energy efficiency within the road transportation sector. Today, empty journeys comprise 25%-40% of all road haulage. To address that issue the goal of this project is to describe and solve an optimization program that...

Optimised Energy Harvesting using Polypower

Lasse Korff, Michael A. E. Andersen & Ole C. Thomsen
When stretching a Dielectric Electro Active Polymer(DEAP) the capacitance of it changes and by that it is possible to harvest energy. This project investigates the great issues of designing the electronics to charge and discharge the DEAP. An analysis of all the elements concerning the electronics has been carried out and based on that a converter has been built and tested.

Occurrence and Distribution of Antibiotic Resistance in Artic Bacteria to Enviromental Antibiotic Exposure and Human Fecal Contamination

María Gómez Lozano, Rolando Saltini, Ingela Dahllöf, Maria E Granberg & Arne Villumsen
Sewage treatment plants are lacking in Sisimiut (Greenland). Thus, untreated wastewater from Sisimiut´s hospital containing active antibiotics is discharged directly into the sea. The effect of the antibiotic contamination in the marine ecosystem was investigated. Bacteria with acquired resistance towards several antibiotics were found in the contaminated site, including potential human pathogens. The presence of bacteria with acquired antibiotic resistance is a problem for both the marine ecosystem and human health, as well as a...

Nano Imprint Lithography, a green technology

Andreas Bundgaard Fønss, Mads Bjerregaard Laursen, Martin Uhd Grønbech, Simone Tanzi, Anders Kristensen & Peter Bøggild
In the 3-week term June 2010 we have worked with Nano Imprint Lithography (NIL) in the course 33422. NIL is a nonconventional lithographic technique for high-throughput patterning of polymer nanostructures at great precision and at low costs. NIL relies on direct mechanical deformation of the resist material and can therefore achieve resolutions beyond the limitations set by light diffraction or beam scattering that are encountered in conventional techniques. In this presentation we will present NIL...

Modifikationer af vindscanner til placering i mølle-hub

Emil Holm Knudsen & Niels Henrik Mortensen
Projektet omhandler indledende design facer i forbindelse med udviklingen af en ny type vindscanner. Disse vindscanner skal i fremtiden være med til at optimer energiproduktionen fra vindmøllerne. Opgaven er skrevet som bachelor projekt i indeværende semester i samarbejde med DTU Risø og IPU. I opgaven og præsentationen vil følgende emner blive berørt: Kort introduktion til principperne bag vindscanning Anvendelsesmuligheder / perspektiv for scanning af vind Problematikken i nuværende system. Samt Krav og ønsker til ny...

Magnetic Room Temperature Cooling Using Stacks of Gadolinium Plates

Kasper Wigh Lipsø, Luise Theil Kuhn, Christian Bahl & Nielsen
Magnetic refrigeration is an alternative to conventional refrigeration. Where conventional refrigeration uses vapor compression cycles, magnetic refrigeration is based on the magnetocaloric effect, i.e. the property of magnetic materials to change temperature when exposed to a changing magnetic field. The technology is currently used for low temperature cooling (<10K). By implementing stacks of magnetic plates instead of powder, it can be optimized to yield a more energy efficient room temperature cooling than conventional refrigeration. This...

Light Directional Elements (LDIR)

Kasper Bayer Frøhling, Mette Funding La Cour, Mohammed Jassim Ismaiil Al-Abaddi, Søren Vang Fischer, Peter Bøggild & Anders Kristensen
Using the light of the sun as the primary source for illuminating offices and houses is one of the most effective ways of saving energy. The problem, which many knows, is that on a sunny summer day, the light may be too intense to be used directly. Reading a book if the rays of the sun hits directly on the pages can be impossible, not to mention the problem of seeing what is happening on...

iPhone application to support commuters

Johan Van Beusekom, Lars Libak Pedersen, Peter Gammelgaard Poulsen & Jakob Eg Larsen
A great deal of today’s CO2 emissions comes from cars. A way to reduce these emissions is by making people drive together instead of going alone. With our project we are creating a simple application for iPhone that will allow people to carpool easily. The application is convenient since a smartphone is something that you always carry with you. The application lets the user create and request rides and announce this on Facebook or Twitter.

Investigation of MSWI Fly Ash for Utilization in Mortar

Charlotte Rask Jensen, Heidi Serup & Gunvor Marie Kirkelund
Fly ash from municipal solid waste incineration (MSWI) is classified as hazardous waste. However, the fly ash has showed pozzolanic behavior, and therefore it has been investigated whether MSWI fly ash may partly substitute cement in Portland cement mortar after upgrading the MSWI fly ash by electrodialytical removal of metals and salts. The influence of MSWI fly ash according to workability, strength and heat evolution has been investigated. It was shown that MSWI fly ash...

Intelligent Energy System for Small Scale Alternative Intermittent Power Sources

Christian Sonne, Martin Drejer & Preben Nyeng
Design and implementation of an IES for an existing alternative intermittent energy structure, coupled with small scale energy storage system. System will intelligently scale down scalable power drains, and disable non-essential non-scalable drains to ensure power availability for essential systems. Non-volatile logging of resource-data for later analysis will also be provided.

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