Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 180 for “"Life time"”.
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Hollow cathode life time modelling
… in ion and Hall-effect thrusters. Hence, their lifetime is a key factor in all these applications.<br/><br/>HCs have demonstrated the capability of providing up to 30,000 hours of operation, whereas no direct experimental data exist above this limit.<br/><br/>The importance of HC lifetime is a …
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The time of your life: time congruence and its relations to authenticity and mindfulness
… been proposed as a new way of conceptualizing time use by examining the ways a person's actual time use reflects the individual's values and preferences. Evidence from previous studies shows numerous benefits from experiencing congruence between actual and ideal time use. In this study, I …
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Does Asian American Adolescent Life Time Depression Differ Based on Sex, Age and Parental Involvement?
… female adolescents not only had higher risk for lifetime MDE but also tended to report more depressive symptoms than male adolescents. Controlling for age and gender, adolescents with low parental involvement were at significant higher risk for MDE than adolescents with high parental involvement. …
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SYNTHESIS AND CHARACTERIZATION OF NEW ELECTROCATALYTIC MATERIALS TO IMPROVE THE PERFORMANCE, OPERABILITY AND LIFE-TIME OF PEMFCS
… purposes. However, several limitations such as lifetime, reliability and cost are hindering the commercialization of these systems. The enhancement of catalytic activity and durability of catalysts represents one of the most important issues in fuel cell technology. To increase the performace …
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Psychotic disorders in the Lundby population 1947-1997: Incidence, life-time prevalence and predictors related to personality and behaviour
… did not differ between the sexes. The lifetime prevalence in 1997 was higher in males than in females for the general group including any psychotic or bipolar disorder. For the specific psychoses the lifetime prevalences in 1997 did not differ significantly between the sexes. The …
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Cancer free survival in mutation positive HNPCC individuals with colorectal adenomatous polyps identified on surveillance colonoscopy
… related death. Developed populations have a 5-6% lifetime risk of CRC(l). The South African Cancer Registry (last updated 2004) shows a 1/98 and 1/150 life time risk for developing CRC in males and females respectively (2).
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Prevalence and predictors of alcohol use among HIVpositive Malawian adolescents attending selected AntiRetroviral Treatment clinics in Blantyre, Malawi
… years. ALHIV participants were asked about their lifetime alcohol use and other psychosocial issues such as depression and anxiety symptoms, stigma, social support, peer pressure, post-traumatic stress disorder (PTSD), community factors, and family factors. For categorical and continuous …
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Prognostics and health management of light emitting diodes
… of diagnosing, predicting the remaining useful life and estimating the reliability of systems and products. Prognostics and Health Management (PHM) has emerged in the last decade as one of the most efficient approaches in failure prevention, reliability estimation and remaining useful life …
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Experimental Study on Viscoelastic Properties and Fracture Characteristics in Polymers
… condition;<br />3. To determine the delayed time or life time on fracture of the polymer under constant loading ; and<br /> 4. To verify the relationship, theoretically predicted, between the time to fracture and the material characteristics of the polymer with experimental …
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An investigation into the effect of information on decision-making for members of defined contribution pension funds
… live on what they have saved over their working life-times if they are not to be dependent on the state or family. However, investments made over the working life-time may be inadequate to provide fully for retirement. Whilst it is obvious that one must save enough to retire on, it is not always …
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AD/HD and autism spectrum disorders in adults
… disorders (ASDs) are early-onset, but often life-time impairing, neurodevelopmental disorders. They are highly overlapping and seem to carry considerable risks of negative outcomes, psychiatrically and psychosocially. Childhood hyperactivity is a known risk factor for early-onset conduct …
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Studies on aspects of the physiology and pathophysiology of pancreatic polypeptide
… the peptide; thirdly, the organ uptake and half-life time of endogenous PP was measured in pigs; and finally, basal and stimulated serum hPP concentrations were assayed in patients with acute pancreatitis, chronic pancreatitis and maturity-onset diabetes mellitus.
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The Cessation of NSSI: Differences in Acquired Capability and Distress Tolerance
… It was hypothesized that individuals with longer time in-between assessment and NSSI would show lower levels of acquired capability and higher levels distress tolerance regardless of lifetime frequency. These hypotheses were tested by surveying 375 undergraduate university students (64% female; …
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Single-stage boost integrated asymmetrical half-bridge AC-DC power converter with dual modulation for indoor led lighting
… output capacitors hence enhancing the life time of power supplies. The thesis also includes optimizing the DC link voltage. Design of magnetics for the converter has been carried out. Analytical and simulation results are presented as the proof of concept.
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Low power CMOS IC, biosensor and wireless power transfer techniques for wireless sensor network application
… secondary replacement surgery after the battery life-time which is often not desired, especially for an implantable application. Thus an energy harvesting method needs to be investigated. In addition to energy harvesting, the sensor network needs to be low power to extend the wireless power …
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Beyond particles and localities in quantum matters
… the power-law liquid form of the scattering life-time, the violation of the conductivity sum rule, and the appearance of the anomalous dimension for the current. Our results suggest that the correct description of the low-energy theory of the normal state of the cuprates could involve …
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Current-mode CMOS hybrid image sensor
… cameras indispensable in many modern life devices like cell phones, surveillance devices, personal computers, and tablets. For various purposes wireless portable image systems are widely deployed in many indoor and outdoor places such as hospitals, urban areas, streets, highways, …
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Bioavailability of dissolved organic matter in coastal waters
… BDOM produced in the Ría de Vigo, with a half life time of 1.9 - 3.3 days, is significantly more labile than that produced in Loch Creran, with a half life time of 6 - 13 days.<br/>A fraction of DOM is coloured containing a part that absorbs (CDOM), and a part that absorbs and reemits the …
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Design of rectifier power supplies for Thermal Energy Storage System
… Energy Storage System (TESS) which has longer life-time as an alternative to Battery Energy Storage System. Both thermal and electrical design aspects are investigated in this work. For thermal part; detailed analysis of electrical properties of the heating element (i.e. graphite) is conducted …
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Probabilistic impact of charging plug-in electric vehicles on the electric energy distribution systems
… on the distribution transformer’s insulation life, the work presented here looks into the probabilistic assessment of the impact of charging plug-in electric vehicles on the distribution transformer’ life time. This thesis also considers the effect of time of use price (TOU) and different …
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