206 research outputs found
Supplement_1_Recording_Steps – Supplemental material for EEG Theta/Beta Ratio Calculations Differ Between Various EEG Neurofeedback and Assessment Software Packages: Clinical Interpretation
No full textSupplemental material, Supplement_1_Recording_Steps for EEG Theta/Beta Ratio Calculations Differ Between Various EEG Neurofeedback and Assessment Software Packages: Clinical Interpretation by Cynthia Kerson, Roger deBeus, Howard Lightstone, L. Eugene Arnold, Justin Barterian, Xueliang Pan and Vincent J. Monastra in Clinical EEG and Neuroscience</p
High rates of tuberculosis in end-stage renal failure: the impact of international migration.
No full textWe studied a cohort of patients requiring renal dialysis who had migrated to the United Kingdom from tuberculosis (TB)-endemic countries and found extremely high rates of TB (1,187 cases per 100,000 per year), partly associated with end-stage diabetic renal disease. We recommend enhanced vigilance and screening of such patients, both to reduce illness and death and to prevent nosocomial spread of TB among susceptible persons
Can we manage lupus nephritis without chronic corticosteroids administration?
No full textThe outcome of lupus nephritis (LN) has changed since the introduction of glucocorticoids (GCs), which dramatically reduced the mortality related to one of the most severe complications of systemic lupus erythematosus (SLE). Since the 1950's, other immunosuppressants, including biologic drugs (i.e. rituximab) have aided in maintaining remission, preserving kidney function, but not preventing treatment-related toxicity. GCs still remain the cornerstone in the treatment of SLE, including LN, and they are widely used in clinical practice. However, GC administration represents a double-edged sword. Indeed, from one side they allow a fast and effective control of disease activity by dampening inflammation; from the other side, they have many and severe side effects leading to organ damage. In this paper, we will discuss pros and cons of the chronic use of GCs, especially focusing on LN
On-line program analysis and diagnosis.
No full textFor many program errors and program checkout problems,
on-line techniques provide a promising method of attack.
An approach developed in connection with time -sharing
computer systems is examined. Then Program Trace, an
on-line diagnostic program developed by the author for
the CDC 1604 computer, and a Data Display Model DD 65
display and control console is presented and examined in
detail.Approved for public release; distribution is unlimited.Lieutenant, United States Navyhttp://archive.org/details/onlineprogramnal109452478
STUDY OF FULLY-MIXED HYBRID THERMAL ENERGY STORAGE WITH PHASE CHANGE MATERIALS FOR SOLAR HEATING APPLICATIONS
No full textA novel design of hybrid thermal energy storage (HTES) using Phase Change Material (PCM) was evaluated using a mathematical model. Both single and multi-tank (cascaded) storage were explored to span small to large-scale applications (200-1600 litres). The storage element was based on the concept of a fully-mixed modular tank which is charged and discharged indirectly using two immersed coil heat exchangers situated at the bottom and top of the tank. A three-node model was developed to simulate different thermal behaviors during the operation of the storage element. Experiments were conducted on full-scale 200-l single-tank sensible heat storage (SHS) and hybrid thermal energy storage (HTES) to provide validation for the mathematical model. The HTES incorporated rectangular PCM modules submerged in the water tank. Satisfactory agreement was found between the numerical results and the experimental results obtained by Mather (2000) on single and multi-tank SHS. In addition, good agreement was noticed with the experiments performed by the author on single-tank SHS and HTES at McMaster University. The developed model was found to provide high levels of accuracy in simulating different operation conditions of the proposed design of storage element as well as computational efficiency.
A parametric study was undertaken to investigate the potential benefits of the HTES over the SHS, operating under idealistic conditions. The HTES can perform at least two times better than the SHS with the same volume. The PCM volume fraction, melting temperature and properties were found to have critical impact on the storage gains of the HTES. All the parameters must be adjusted such that: (1) the thermal resistance of the storage element is minimized, and (2) most of the energy exchange with the storage element takes place in the latent heat form.
The performance of the single-tank HTES was evaluated numerically while operating in a solar thermal domestic hot water (DHW) system for a single-family residence. The PCM parameters were selected to maximize the solar fraction during the operation on a typical spring day in Toronto. The use of the HTES can reduce the tank volume by 50% compared to the matched size of the SHS tank. However, the HTES was found to underperform the SHS when the system was operated in different days with different solar irradiation intensities. The effect of different draw patterns was also investigated. The results indicated that thermal storage is needed only when the energy demand is out-of-phase with the energy supply. For the same daily hot water demand, different consumption profiles; ex. dominant morning, dominant evening, dominant night and dispersed consumptions, showed slight impact on the performance of the system.
The concept of multi-tank (cascaded) HTES storage was explored for medium/large scale solar heating applications such as for restaurants, motels, and multi-family residences. The design was based on the series connection of modular tanks through the bottom and top heat exchangers. Each individual tank had a PCM with different melting temperature. The results showed that the cascaded storage system outperformed the single-tank system with the same total volume as a result of the high levels of sequential or tank-to-tank stratification. The use of the cascaded HTES resulted in slight improvement in the solar fraction of the system.ThesisDoctor of Philosophy (PhD
Stateful Realizers for Nonstandard Analysis
No full textIn this paper we propose a new approach to realizability interpretations for
nonstandard arithmetic. We deal with nonstandard analysis in the context of
(semi)intuitionistic realizability, focusing on the Lightstone-Robinson
construction of a model for nonstandard analysis through an ultrapower. In
particular, we consider an extension of the -calculus with a memory
cell, that contains an integer (the state), in order to indicate in which slice
of the ultrapower the computation is being done. We pay
attention to the nonstandard principles (and their computational content)
obtainable in this setting. In particular, we give non-trivial realizers to
Idealization and a non-standard version of the LLPO principle. We then discuss
how to quotient this product to mimic the Lightstone-Robinson construction
A CFD Study on the Extraction of Geothermal Energy from Abandoned Oil and Gas Wells
No full textThis thesis investigates the feasibility of converting spent oil and gas wells for use in geothermal power generation. A novel approach to heat exchange with the ground was proposed whereby two directionally drilled (L-shaped) wells are connected to create a continuous loop. A Computational Fluid Dynamics (CFD) model was developed that simulates flow through the connected wells and the associated heat exchange with the ground. The model consisted of a coupled fluid-solid domain; 1D fluid flow was explicitly coupled to the 2D cylindrical solid domain using a convection boundary condition. Temperatures in the solid domain were resolved using an Alternating Direction Implicit (ADI) solver, which suited the largely unidirectional nature of the heat transfer problem. Fluid temperatures were solved for using a Tri-Diagonal Matrix Algorithm (TDMA). The results from a series of simulations demonstrated that geothermal power generation from abandoned wells is feasible under certain conditions. The findings of this research show that the correct selection of a well, considering geothermal gradient, well diameter, and ambient temperatures (impacting the inlet temperature), will significantly influence the level of power production. Further, the simulations show that it is necessary to optimize the flow rate for the given well conditions. The research indicates that the addition of insulation to a portion of the system can lead to modest improvements in power when the system is operated continuously. In contrast, it was found that insulation was necessary for the viability of intermittent use, which would allow the system to meet the demand for peak power generation. The simulations demonstrated that the proposed system could produce approximately 200 kW to 300 kW of electricity.ThesisMaster of Applied Science (MASc
Becoming Canadian: Folk Literary Innovation in the Memoirs of Yiddish-Speaking Immigrants to Canada
No full textThis article considers the ways Yiddish-speaking immigrants to Canada creatively adapted folklore that they learned in “the old home” in order to make it fit their new Canadian contexts, and in doing so created new hybrid folklore and identities. To do this, I discuss the autobiographical texts of three people who migrated between 1900 and 1930, J.J. Goodman’s Gezamelte Shriften (Collected Writings) (Winnipeg: 1919), Michael Usiskin’s Oksn un Motorn (Oxen and Tractors) (Toronto: 1945), and Falek Zolf ’s Oyf Fremder Erd (On Foreign Soil) (Winnipeg: 1945). I argue that these personal narratives offer important insights into how the first major wave of Eastern European Jewish immigrants to Canada formed and expressed Canadian-Eastern European Jewish culture.Dans le présent article, nous explorerons la créativité avec laquelle les immigrants yiddishophones ont adapté au contexte canadien le folklore qu’ils ont appris dans l’« ancien monde », créant, de ce fait, un folklore hybride, ainsi que de nouvelles identités. À cette fin, nous examinerons les textes autobiographiques de trois individus qui ont immigré au pays entre 1900 et 1930, à savoir les Gezamelte Shriften (OEuvres complètes) de J. J. Goodman (Winnipeg, 1919), Oksn un Motorn (Les boeufs et les tracteurs) de Michael Usiskin (Toronto, 1945) et Oyf Fremder Erd (En sol étranger) de Falek Zolf (Winnipeg, 1945). Nous défendrons la thèse suivant laquelle ces récits offrent d’importantes pistes pour comprendre la contribution de la première vague d’immigrants juifs d’Europe orientale à la création et l’expression de la culture judéo-canadienne est-européenne
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