• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 253
  • 113
  • 44
  • 44
  • 36
  • 27
  • 19
  • 18
  • 10
  • 10
  • 7
  • 5
  • 4
  • 3
  • 2
  • Tagged with
  • 706
  • 112
  • 94
  • 79
  • 71
  • 67
  • 63
  • 62
  • 56
  • 51
  • 38
  • 36
  • 34
  • 34
  • 33
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
61

Modelování a optimalizace fyzikálních veličin při návrhu bazénových vzduchotechnických jednotek / Modelling and optimization of physical variables in the design of swimming pool air handling units

Tesař, Zdeněk January 2014 (has links)
The work deals with the modeling and optimization physical variables in the design of air conditioning units serving rooms with high humidity - pool hall. Modeling is solved by creating software for a few basic compositions of air conditioning dehumidification devices. Calculations are programmed into the DLL in Delphi programming language.
62

Évaluation à l'aide d'indicateurs biogéochimiques du succès de création des mares de tourbières situées au Québec et au Nouveau-Brunswick dans un contexte de restauration

Jolin, Émilie 04 1900 (has links)
L'extraction de la tourbe pour en produire des substrats horticoles entraine la perte de leur capacité à séquestrer le carbone (C) dans les sols. Cependant, depuis plus d’une trentaine d’années, de nombreuses tourbières se sont vues restaurées et dans certains cas des mares sont intégrées. Les mares de tourbières sont présentes surtout dans les régions côtières et maritimes et sont généralement émettrices de C, à l’inverse des tourbières. Or, les mares sont des micro-habitats ayant un grand potentiel lié à la biodiversité et jouent ainsi un rôle très important pour de nombreuses espèces. De manière générale, la mesure du succès de la restauration des mares se concentre surtout sur le retour des espèces végétales typiques des mares naturelles et la présence d’un niveau d’eau constant à l’année. Très peu d’études se concentrent sur la biogéochimie des mares pour évaluer le succès de la restauration. Mon projet de recherche vise à évaluer le succès de la création des mares dans les projets de restauration de tourbière en utilisant des variables biogéochimiques. La recherche vise donc à identifier les différences biogéochimiques entre les mares créées et naturelles en plus de déterminer la trajectoire biogéochimique des mares créées dans le temps. Pour ce faire, nous avons mesuré différentes variables biogéochimiques telles le pH, les concentrations d’azote (N), de phosphore (P), de carbone organique dissout (DOC), de cations basiques – calcium (Ca), sodium (Na), magnésium (Mg) et potassium (K) et des gaz dissouts - méthane (CH4), dioxyde de carbone (CO2) et protoxyde d’azote (N2O) -. L’échantillonnage s’est fait dans 62 mares réparties au sein de 7 tourbières situé au Québec et au Nouveau-Brunswick : des mares naturelles et des mares créées il y a entre 3 et 22 ans. Les mares naturelles et créées ont des caractéristiques biogéochimiques différentes, et ce sans prendre en compte l’année de création. De ce fait, l’eau des mares créées est moins acide (pH >5) et plus concentrée en nutriments - N et P - que les mares naturelles. Cependant, les mares créées les plus anciennes ont tendance à se rapprocher des caractéristiques biogéochimiques des mares naturelles où la variation de la nappe phréatique et par le fait même la profondeur des mares viendraient jouer un rôle important sur les variables biogéochimiques. Des mares créées plus profondes et plus grandes pourraient ainsi permettre une présence d’eau permanente sans qu’elles s’assèchent durant l’été et ainsi favoriser le retour des conditions biogéochimiques similaires aux mares naturelles. / The extraction of peat to produce horticultural substrates leads to the loss of their ability to sequester carbon (C) in soils. However, over the past 30 years, many peatlands have been restored and open-water pools have been incorporated in some cases. Pools are naturally present in some bogs, especially in coastal and maritime regions, and are generally net C emitters, unlike peatlands. Pools are known to be micro-habitats with great potential for biodiversity and play a very important role for many species. In general, the measurement of the success of pool creation focuses on the return of bog plant species and a constant presence of water throughout the year. Currently, very few studies focus on the biogeochemistry of created pools to assess success. My research project uses biogeochemical variables to evaluate the success of created pools in peatland restoration projects. The research aims to identify biogeochemical differences between created and natural pools and to determine the biogeochemical trajectory of created pools over time. We measured different biogeochemical variables such as pH, nitrogen (N), phosphorus (P), dissolved organic carbon (DOC), base cations - calcium (Ca), sodium (Na), magnesium (Mg) and potassium (K) and dissolved gases - methane (CH4), carbon dioxide (CO2) and nitrous oxide (N2O) -. Sampling was done in 62 pools located in 7 peatlands in Quebec and New Brunswick. We sampled both natural pools and pools created between 3 and 22 years ago. Natural and created pools have different biogeochemical characteristics, without considering the year of creation. Water in created pools is less acidic (pH >5) and more concentrated in nutrients - N and P - than in natural pools. However, the oldest created pools tend to be closer to the biogeochemical characteristics of natural pools. The variation of the water table and the depth of the pools play an important role for the return towards natural biogeochemical characteristics. Deeper and larger created pools could allow a permanent water presence during dry periods in summer and thus promote the return of biogeochemical conditions similar to natural pools.
63

Statistical Analysis of Mining Parameters to Create Empirical Models to Predict Mine Pool Formation in Underground Coal Mines

Schafer , Lindsey A. 01 October 2018 (has links)
No description available.
64

Závady a nedostatky bazénových provozů / Defects and shortcomings pool operations

Wagnerová, Andrea January 2016 (has links)
The master thesis is focused on problems surrounding defects and deficiencies of running a swimming pool site. It deals with particular defects which can occur at swimming pool's site. Different public swimming pools in Brno were visited to conduct an evaluation of real defects and deficiencies. After conducting the overview of defects, a correction solution was design for each defect. The defects are ranked according a scale measuring danger which I created
65

Model-based Assessment of Heat Pump Flexibility

Wolf, Tobias January 2016 (has links)
Today's energy production is changing from scheduled to intermittent generation due to the increasing energy injection from renewable sources. This alteration requires flexibility in energy generation and demand. Electric heat pumps and thermal storages were found to have a large potential to provide demand flexibility which is analysed in this work. A three-fold method is set up to generate thermal load profiles, to simulate heat pump pools and to assess heat pump flexibility. The thermal profile generation based on a combination of physical and behavioural models is successfully validated against measurement data. A randomised system sizing procedure was implemented for the simulation of heat pump pools. The parameter randomisation yields correct seasonal performance factors, full load hours and average operation cycles per day compared to 87 monitored systems. The flexibility assessment analysis the electric load deviation of representative heat pump pool in response to 5 different on / off signals. The flexibility is induced by the capacity of thermal storages and analysed by four parameters. Generally, on signals are more powerful than off signals. A generic assessment by the ambient temperature yield that the flexibility is highest for heating days and the activated additional space heating storage: Superheating of the storage to the maximal temperature provides a flexible energy of more than 400 kWh per 100 heat pumps in a temperature range between -10 and +13 °C.
66

Experimental Observation and Measurements of Pool Boiling Heat Transfer using PIV, Shadowgraphy, RICM Techniques

Di, Yuan 1988- 14 March 2013 (has links)
This present study seeks to contribute detailed visualization data on a pool boiling experiments using HFE-7000. Particle Image Velocimetry (PIV) was used to measure the time resolved whole field liquid velocity. Bubble dynamic parameters such as nucleation site density, bubble departure diameter, contact angles and frequency were obtained in shadowgraphy measurements. Infrared thermometry with an IR camera was used for observation of temperature fluctuations of nucleation sites. The experiments were taken for the heat flux from 0.042 kW/m^2 to 0.266 kW/m^2, six experimental conditions in total. To provide a supplementary description of heat transfer mechanism, a novel bubble characterization technique, reflection interference contrast microscopy (RICM), was used to obtain detailed information on bubble dynamic parameters on the microscopic scale. Bubble diameter was obtained from RICM pictures. Comparison between the experiments results and previous empirical correlation were made. Agreements and discrepancies were discussed.
67

Expansion of the Equipment Allowance Pool at Twentynine Palms, California, using Reserve assets

O'Bryan, Patrick W., Malloy, Dennis J. 12 1900 (has links)
Approved for public release; distribution is unlimited / Static marginal analysis is applied to the Marin e Corps' proposed expansion of the Equipment Allowance Pool at Twentynine Palms, California, using Select Marine Corps Reserve assets. A formula is presented for determining potential equipment candidates. The formula is presented for determining potential equipment candidates. The formula combines various weighting factors, equipment use, and savings potential to produce a keep factor. Assets with low keep factors are selected first. Recommendations for further studies are also made. / http://archive.org/details/expansionofequip00obry / Captain, United States Marine Corps / Captain, United States Marine Corps
68

Pools / Dreams / Parental Gaze

Gafny, Tal 01 January 2014 (has links)
This thesis is a testimony of thoughts and ideas that have been circulating in my studio for the past few years, in their current form. It is also an experiment in writing an autobiographical piece of prose. It was written parallel to, and after, making the film Double Take with Perrin Turner. The film is an exploration of a number of relationships, related and sometimes haunted by one another. I wish for this text to operate not only as an after-the-fact recollection of thoughts, but also in relation to what will follow it – similarly to the way a trailer operates in relation to a movie. This is an extract and a prologue rather than conclusion or resolution.
69

Testování maximální SF v plaveckém trenažéru a plaveckém bazénu - porovnání metod / Testing of maximum SF in a swimming flum, and swimming pool - a comparison of methods

Hubička, Tomáš January 2015 (has links)
Title: Testing of Maximum HR in the Swimming Flum and Swimming Pool Objectives: The aim is to compare the detection method of max HR in a swimming Flum with the method of detection max HR in the classic swimming pool. By meeting other goals we want to determine which method is more precise, what the positives and negatives of individual measurements show and what the difference are practically max values observed in HR pool and the Flume compared with the results of theoretical calculation max HR. Methods: According to a pilot study with methodology of the thesis, HRmax was tested in a swimming Flum and the methodology according to Formanek and Horčic HRmax testing was carried out in the swimming pool. A sample of probands were selected from students UK FTVS. For the recording was used sporttester and data evaluation program execution Polar Precision Performance. To determine the submaximal swimming speed we used CSS test. This rate was also used to warm up before swimming test to the individual HRmax of probands in a swimming Flum. The measured data of both measurements were compared with each other and the results described and evaluated. Results: CSS gained speed in m/s, was used in the Flume in escalations test to HRmax. We measured values HRmax tests in a Flume and in a swimming pool. The Test...
70

Regulation of Cav2.1 by Ankyrin B and its variants

Choi, Catherine S.W. 19 August 2019 (has links)
Ankyrin B (AnkB) is a scaffolding protein, acting as a bridge between ion channels and cytoskeleton networks. AnkB variants are associated with cognitive disorders including autism spectrum disorder and epilepsy. In the brain, AnkB interacts with Cav2.1, the pore-forming subunit of P/Q type voltage gated calcium channels. However, how AnkB regulates Cav2.1 is not fully understood. Using HEK293T cells, we discovered that AnkB increases Cav2.1 expression levels but does not change Cav2.1 surface levels. AnkB p.S646F increases Cav2.1 to an even greater level of expression, again without impacting Cav2.1 surface levels. Looking at a partial loss of AnkB in glutamatergic neurons, overall Cav2.1 levels decreased at P30 but the synaptosomal fraction was not impacted. Our findings indicate that AnkB plays a role in regulating an intracellular pool of Cav2.1 but does not affect the surface or the synaptosomal pools of Cav2.1. This intracellular pool of Cav2.1 may play an important role in neuronal function and homeostasis, suggesting a mechanism for neuronal pathogenicity of AnkB variants. / Graduate / 2020-08-06

Page generated in 0.0282 seconds