Response Test (response + test)

Distribution by Scientific Domains


Selected Abstracts


Energy, exergy and uncertainty analyses of the thermal response test for a ground heat exchanger

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, Issue 6 2009
M. H. Sharqawy
Abstract This paper presents energy, exergy and uncertainty analyses for the thermal response test of a ground heat exchanger. In this study, a vertical U-shaped ground heat exchanger with 80,m depth and 20,cm borehole diameter is installed for the first time at the university premises in Saudi Arabia. A mobile thermal response apparatus is constructed and used to measure the performance of the ground heat exchanger. The thermal response test was carried out four times at different thermal loads from September 2007 to April 2008. The energy and exergy transports of these thermal response tests were analyzed using the experimental results obtained in this period. The analysis provides a better understanding of the overall performance of vertical ground heat exchangers, verifies the thermal response test results and improves the experimental setup. Copyright © 2008 John Wiley & Sons, Ltd. [source]


Ground water level influence on thermal response test in Adana, Turkey

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, Issue 7 2008
. Bozda
Abstract For optimum design of borehole thermal energy storage (BTES) and ground sources heat pump (GSHP) applications, determination of underground thermal properties is required. The design and economic feasibility (number and depth of boreholes) of these systems need thermal conductivity of geological structure, , (W,m,1,K,1), and thermal resistance of ground heat exchanger, R (K,W,1,m). Thermal properties measured in laboratory experiments do not coincide with data of in situ conditions. Therefore, in situ thermal response test equipment has been developed and used in Canada, England, Germany, Norway, U.K., U.S.A. and Sweden to ensure precise designing of BTES systems. This paper describes the results and evaluations of the Adana continual thermal response test measurements. Copyright © 2007 John Wiley & Sons, Ltd. [source]


Attention and Vigilance in Children with Down Syndrome

JOURNAL OF APPLIED RESEARCH IN INTELLECTUAL DISABILITIES, Issue 6 2008
Kim L. Trezise
Background, Down syndrome (DS) has been the focus of much cognitive and developmental research; however, there is a gap in knowledge regarding sustained attention, particularly across different sensory domains. This research examined the hypothesis that children with DS would demonstrate superior visual rather than auditory performance on a sustained attention task and that this modality difference would not be seen in children with non-specific intellectual disability (NSID). Materials and Methods, Eleven children with DS and 16 children with NSID were compared on two versions of the sustained attention to response test (SART), varying only in presentation modality (visual or auditory). Errors of commission (failure to withhold response to target) and errors of omission (failure to respond to non-target distractors) were recorded. Results, Significant group differences were found in the visual modality and mental age was also found to effect error rates in the visual condition. No effect of group or mental age was observed in the auditory SART. Conclusions, Results suggest that, for individuals with DS, presentation of education material in a visual medium may facilitate sustained attention and thus learning. Further research using tools such as the SART to explore modality differences in sustained attention and additional cognitive domains is recommended. [source]


Hypoxic ventilatory depression in a patient with mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes

RESPIROLOGY, Issue 2 2001
Shinobu Osanai
We describe a case of a 21-year-old man with mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes (MELAS) who presented with hypoxic ventilatory depression. He had chronic hypoventilation, which was not explained by weakness of respiratory muscles. His hypercapnic ventilatory response was not impaired. In contrast, hypoxic ventilatory depression was observed in the isocapnic progressive hypoxic response test. After exposure to hypoxic conditions, his respiratory frequency decreased and tidal volume was unchanged. The hypoxic ventilatory depression was partially blocked by pretreatment with aminophylline. In conclusion, we need to be careful with patients with MELAS who are hypoxaemic because a vicious circle of hypoxia and hypoventilation can occur. [source]


Energy, exergy and uncertainty analyses of the thermal response test for a ground heat exchanger

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, Issue 6 2009
M. H. Sharqawy
Abstract This paper presents energy, exergy and uncertainty analyses for the thermal response test of a ground heat exchanger. In this study, a vertical U-shaped ground heat exchanger with 80,m depth and 20,cm borehole diameter is installed for the first time at the university premises in Saudi Arabia. A mobile thermal response apparatus is constructed and used to measure the performance of the ground heat exchanger. The thermal response test was carried out four times at different thermal loads from September 2007 to April 2008. The energy and exergy transports of these thermal response tests were analyzed using the experimental results obtained in this period. The analysis provides a better understanding of the overall performance of vertical ground heat exchangers, verifies the thermal response test results and improves the experimental setup. Copyright © 2008 John Wiley & Sons, Ltd. [source]


The postejaculatory refractory period: a neurophysiological study in the human male

BJU INTERNATIONAL, Issue 9 2000
U. Yilmaz
Objective To investigate changes in the penile sensory threshold, and the variables of cortical somatosensory evoked potential and sacral evoked response tests in the early postejaculatory period in the human male. Subjects and methods Twenty healthy volunteers (mean age 25.3 years, range 17,32) were evaluated before and after ejaculation for penile sensory threshold values, and the variables of sacral evoked response and cortical somatosensory evoked potential tests. Results Three subjects were excluded from the statistical analyses because there were significant differences among the repeated tests. In the remaining 17 subjects the penile sensory threshold was significantly greater in the postejaculatory period (P < 0.05). There were no significant changes in the other variables of both the sacral evoked response and cortical somatosensory evoked potential tests after ejaculation (P > 0.05). Conclusion The postejaculatory refractory period in the human male is accompanied by a greater penile sensory threshold but with no change in the values of the sacral evoked response and cortical somatosensory evoked potential. [source]