Searched for: subject:"intermittent"
(1 - 20 of 32)

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Verbart, Joost (author)
This thesis proposes a novel design approach for a monitoring system that can detect hidden leaks in intermittent water supply (IWS) systems. Cities with IWS conditions in their drinking water network, such as Nairobi and Harare, often have a high percentage of non-revenue water (NRW) in their system. Estimations of the amount of NRW in these...
master thesis 2021
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Al-Washali, T.M.Y. (author)
Water utilities worldwide lose 128 billion cubic meters annually, causing annual monetary losses estimated at USD 40 billion. Most of these losses occur in developing countries (74%). This calls for a rethinking of the challenges facing water utilities in developing countries, foremost of which is the assessment of water losses in intermittent...
doctoral thesis 2020
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Koreman, Dion (author)
With the Paris climate accords signed in 2016, most countries have committed themselves to ambitious climate targets during the next decades. One of these targets is a dramatic increase in the overall energy portfolio's market share of renewable energies. This increase in renewable market share will, for a large part, consist of newly built...
master thesis 2020
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Bao, B. (author)
Today's mobile devices powered by batteries have kept feeding users endless entertainment and convenience, whereas always accompanied by some unfavorable experiences that is 'Always have to recharge'. The puzzle of battery life has been an inevitable limitation that could probably degrade user experience, even though smartphones, smart homes,...
master thesis 2020
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Kortbeek, V. (author), Yildirim, Kasim Sinan (author), Bakar, Abu (author), Sorber, Jacob (author), Hester, Josiah (author), Pawełczak, Przemysław (author)
Tiny energy harvesting sensors that operate intermittently, without batteries, have become an increasingly appealing way to gather data in hard to reach places at low cost. Frequent power failures make forward progress, data preservation and consistency, and timely operation challenging. Unfortunately, state-of-the-art systems ask the...
conference paper 2020
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van der Linden, S.J.A. (author)
Stable boundary layers (SBLs) are a common aspect of the earth’s atmosphere and are characterized by a stable density stratification in which the temperature increases with height. This typically occurs during the night, resulting in a short-lived stable boundary layer, or persistently throughout the polar winter, resulting in a longlived stable...
doctoral thesis 2020
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Majid, A.Y. (author)
Battery-free energy-harvesting devices have the potential to operate for decades, since they draw power fromvirtually unlimited energy sources, such as sunlight. However, ambient energy sources are volatile, and tiny harvesters can extract only weak power from them. Thus, small energy-harvesting devices operate intermittently: first, they charge...
doctoral thesis 2020
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Sakomoto, Takuya (author), Lutaaya, Mahmood (author), Abraham, E. (author)
Intermittent water supply networks risk microbial and chemical contamination through multiple mechanisms. In particular, in the cities of developing countries, where intrusion through leaky pipes are more prevalent and the sanitation systems coverage is low, contaminated water can be a public health hazard. Although countries using intermittent...
journal article 2020
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Majid, A.Y. (author), Delle Donne, C. (author), Maeng, Kiwan (author), Colin, Alexei (author), Yildirim, Kasim Sinan (author), Lucia, Brandon (author), Pawełczak, Przemysław (author)
Energy-neutral Internet of Things requires freeing embedded devices from batteries and powering them from ambient energy. Ambient energy is, however, unpredictable and can only power a device intermittently. Therefore, the paradigm of intermittent execution is to save the program state into non-volatile memory frequently to preserve the...
journal article 2020
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den Dekker, Pieter (author)
In this thesis, I develop and evaluate a demand-side approach to transition from an intermittent to a continuous water supply using a district metered areas approach in Accra, Ghana, an urban metroplex of 4.0 million persons in western Africa. Intermittent water supply (IWS) is inherently inefficient. These systems foment health hazards and are...
master thesis 2020
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Thota Radhakrishnan, A.K. (author), Poelma, C. (author), van Lier, J.B. (author), Clemens, F.H.L.R. (author)
Transition from laminar to turbulent flow of non-Newtonian fluids is investigated using velocimetry data. These data are obtained by applying particle image velocimetry to images obtained through ultrasound imaging (echography). This yielded the observation of intermittent structures (puffs and slugs) that are formed during transition. Post...
journal article 2020
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Al-Washali, T.M.Y. (author), Sharma, Saroj (author), Lupoja, Robert (author), AL-Nozaily, Fadhl (author), Haidera, Mansour (author), Kennedy, M.D. (author)
Reducing all water loss components to zero is neither technically possible nor economically viable. The water loss components should be accurately assessed and prioritised for a reduction. This paper investigates all methods that break down the water losses in distribution networks into apparent and real losses. Their accuracies and...
review 2020
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Al-Washali, T.M.Y. (author), Mahardani, Meidy (author), Sharma, Saroj (author), Arregui, Francisco (author), Kennedy, M.D. (author)
Intermittent supply is common worldwide. It triggers households with piped connection to adjust the supply scheme by the use of a water tank with a float valve (FV) at the entrance, which has a major influence on the water meter accuracy. This study investigated the impact of the water tank with a FV on the performance of water meters under...
journal article 2020
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De Winkel, Jasper (author), Kortbeek, Vito (author), Hester, Josiah (author), Pawełczak, Przemysław (author)
We present ENGAGE, the first battery-free, personal mobile gaming device powered by energy harvested from the gamer actions and sunlight. Our design implements a power failure resilient Nintendo Game Boy emulator that can run off-the-shelf classic Game Boy games like Tetris or Super Mario Land. This emulator is capable of intermittent...
journal article 2020
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Majid, A.Y. (author), Schilder, Patrick (author), Langendoen, K.G. (author)
The main obstacles to achieve truly ubiquitous sensing are (i) the limitations of battery technology - batteries are short-lived, hazardous, bulky, and costly - and (ii) the unpredictability of ambient power. The latter causes sensors to operate intermittently, violating the availability requirements of many real-world applications. In this...
conference paper 2020
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Kortbeek, V. (author), Bakar, Abu (author), Cruz, Stefany (author), Yildirim, Kasim Sinan (author), Pawełczak, Przemysław (author), Hester, Josiah (author)
Building and programming tiny battery-free energy harvesting embedded computer systems is hard for the average maker because of the lack of tools, hard to comprehend programming models, and frequent power failures. With the high ecologic cost of equipping the next trillion embedded devices with batteries, it is critical to equip the makers,...
journal article 2020
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Montenegro Cardona, Lorena (author)
The building sector uses 40% of the primary energy worldwide. Energy demand in a non-residential existing building is rising due to higher comfort conditions, population growth and the enhancement of the building services. On the other hand, renewable energy technologies are every time more accessible for the built environment, especially the...
master thesis 2019
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Bleeker, Cliff (author)
In the energy transition the expansion of the amount of renewable energy resources requires new methods for the design of energy systems. To deal with intermittent energy production, different energy technologies and solutions are in development. Hydrogen is a main candidate for this goal. Using Fuel Cell or Battery Electric Vehicles as flexible...
master thesis 2019
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Willems, Tom (author), Hendrikse, H. (author)
Offshore wind turbines at locations where sea or lake ice is present need to be designed to withstand ice-induced loading. For vertical-sided support structures, such as monopiles, the effects of ice-induced vibrations need to be considered in the design. Current practice is either to use approaches provided in design standards, or for example...
conference paper 2019
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Elsinga, G.E. (author), Da Silva, C. B. (author)
The average patterns of the velocity and scalar fields near turbulent/non-turbulent interfaces (TNTI), obtained from direct numerical simulations (DNS) of planar turbulent jets and shear free turbulence, are assessed in the strain eigenframe. These flow patterns help to clarify many aspects of the flow dynamics, including a passive scalar,...
journal article 2019
Searched for: subject:"intermittent"
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