Home About us Contact
|
Home About us Contact | ||
|
|
||
Observation Point (observation + point)
Selected AbstractsOfficial survey, in 2002, for detection of Erwinia amylovora in a proposed protected zone in Jihomoravsky region (Czech Republic)1EPPO BULLETIN, Issue 3 2004O. Vahala Inspectors of the Czech NPPO surveyed the occurrence of fireblight Erwinia amylovora in an area of Jihomoravsky region (South Moravia) proposed as an EU protected zone, including 16 designated buffer zones around nurseries. The disease was not detected in communes where fireblight hosts are grown (nurseries, variety testing stations, orchards) or in buffer zones around nurseries. In 902 communes where fireblight hosts are grown only in orchards or not at all, wild host plants were inspected at 2.629 observation points (2137 located by GARMIN GPS). In Vy,kov district, suspected fireblight was confirmed at one observation point on Crataegus, growing by a railway in Rousínov commune and, in the course of a delimiting survey outside observation points, in four other communes (Drnovice, Habrovany, Komo,any and Vy,kov). [source] Measurement and computation of ground resistances at 161/23.9,11.95-kV indoor-type substationsEUROPEAN TRANSACTIONS ON ELECTRICAL POWER, Issue 3 2009Cheng-Nan Chang Abstract The purpose of this paper is to compare the calculated and actual ground resistances at two 161/23.9,11.95-kV indoor-type substations in the system of Taiwan Power Company. For the calculated ground resistances, one- and two-layer soil models based on Sverak and Schwarz equations, the method of images and the current distribution electromagnetic grounding and soil structure analysis (CDEGS) program are performed. As for the actual ground resistances, they are found by subtracting the measured ground resistances which are obtained by the fall-of-potential method from the earth mutual resistances. As a result, the calculated ground resistance based on the method of images as the observation point located at the lower layer of the two-layer soil model is approximately equal to the actual ground resistance measured by the fall-of-potential method with the potential electrode buried at the lower layer. In addition, the ground potential rises (GPRs) at both substations are computed and compared with the minimum touch voltages for assessing the grounding system safety. The result shows that the design of the grounding system at both substations is unsafe under the one-layer soil model for humans with 50 and 70,kg body weight. Copyright © 2008 John Wiley & Sons, Ltd. [source] Removal of DC power-line magnetic-field effects from airborne total magnetic-field measurementsGEOPHYSICAL PROSPECTING, Issue 3 2000Mehran Gharibi Power lines carrying DC current can strongly affect total magnetic-field measurements. A simple algorithm using Biot,Savart's law was made to remove magnetic-field components due to a DC power line from airborne total magnetic-field measurements in the Gävle area, Sweden. The power-line location was estimated from observed data and then split into short line segments. The magnetic-field components due to each segment were calculated and summed together to give the total magnetic effect due to the power line at each observation point. The corrected total magnetic field was calculated by subtracting the power-line magnetic-field vector, projected on to the direction of the main field, from the measured total field. The results show a successful removal of the power-line magnetic effect from the total magnetic-field measurements. However, an error in the estimation of the power-line location can result in a magnetic-field residual after correction. A non-linear median filtering was used to remove this residual when needed. [source] A posteriori pointwise error estimation for compressible fluid flows using adjoint parameters and Lagrange remainderINTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, Issue 1 2005A. K. Alekseev Abstract The pointwise error of a finite-difference calculation of supersonic flow is discussed. The local truncation error is determined by a Taylor series with the remainder being in a Lagrange form. The contribution of the local truncation error to the total pointwise approximation error is estimated via adjoint parameters. It is demonstrated by numerical tests that the results of the numerical calculation of gasdynamics parameter at an observation point may be refined and an error bound may be estimated. The results of numerical tests for the case of parabolized Navier,Stokes are presented as an illustration of the proposed method. Copyright © 2004 John Wiley & Sons, Ltd. [source] Methodological considerations when conducting direct observation in an outdoor environment: our experience in local parksAUSTRALIAN AND NEW ZEALAND JOURNAL OF PUBLIC HEALTH, Issue 2 2001Susanne Engelhard Objective: This paper discusses some of the inherent methodological limitations of gathering data via direct observation using local parks as a case study. Methods: Direct observation was carried out in five parks on seven non-consecutive days in 1998 and on matched days in 1999. Information recorded for each person included the time of park entry and exit, gender, age group, and activity/ies undertaken while in the park. Methodological considerations: The location of the observation point, observer reliability, recording and accuracy of data, and specific issues related to outdoor observation areas should all be considered when designing a study incorporating direct observation as a data collection method. Conclusions: Direct observation can provide valuable information. However, pilot testing is essential for minimising potential problems associated with this method and optimising data quality. Implications: The issues discussed in this paper provide a useful guide for other researchers undertaking direct observation in outdoor environments. [source] Bed morphology and generation of step,pool channelsEARTH SURFACE PROCESSES AND LANDFORMS, Issue 11 2008Roman B. Weichert Abstract Flume experiments have been carried out to study the formation processes and the bed morphology of step,pool channels. From the experiments different step types and step configurations could be distinguished depending on the stream power. These step types can be seen as an image of the generation mechanisms of step,pool systems. These results suggest that the bed roughness geometry develops towards a condition that provides the maximum possible bed stability for a given grain size distribution. In contrast to a variety of other studies, antidunes did not contribute to the generation of the step structures. However, the data of the presented study fits well into the region of antidune formation proposed by Kennedy for sand-bed rivers. This observation points out that step,pool field-data located in the Kennedy region do not inevitably prove that antidunes played a role in step development. It is rather proposed that in Kennedy's region of antidune formation there exist hydraulic conditions where the flow resistance is maximized. It is suggested that such maximum flow resistance is associated with an optimal distance between the bedforms and their height, independently of whether these are antidunes in sand- and gravel-bed rivers or step,pool units in boulder-bed streams. The considerations of the Kennedy region of antidune formation and the analysis of planform step types depending on stream power both suggest that steep channels have a potential for self-stabilization by modifying the step,pool structure towards a geometry that provides maximum flow resistance and maximum bed stability. Copyright © 2008 John Wiley & Sons, Ltd. [source] Official survey, in 2002, for detection of Erwinia amylovora in a proposed protected zone in Jihomoravsky region (Czech Republic)1EPPO BULLETIN, Issue 3 2004O. Vahala Inspectors of the Czech NPPO surveyed the occurrence of fireblight Erwinia amylovora in an area of Jihomoravsky region (South Moravia) proposed as an EU protected zone, including 16 designated buffer zones around nurseries. The disease was not detected in communes where fireblight hosts are grown (nurseries, variety testing stations, orchards) or in buffer zones around nurseries. In 902 communes where fireblight hosts are grown only in orchards or not at all, wild host plants were inspected at 2.629 observation points (2137 located by GARMIN GPS). In Vy,kov district, suspected fireblight was confirmed at one observation point on Crataegus, growing by a railway in Rousínov commune and, in the course of a delimiting survey outside observation points, in four other communes (Drnovice, Habrovany, Komo,any and Vy,kov). [source] The persistence of neuropsychiatric symptoms in dementia: the Cache County StudyINTERNATIONAL JOURNAL OF GERIATRIC PSYCHIATRY, Issue 1 2004Martin Steinberg Abstract Objective To estimate the 18-month persistence of neuropsychiatric symptoms in dementia in a population-based sample, and to compare the severity of neuropsychiatric symptoms at baseline to the severity at 18-month follow-up. Methods A population-based sample of 329 residents of Cache County, Utah, diagnosed with dementia was rated on the Neuropsychiatric Inventory (NPI). Of the 204 participants with neuropsychiatric symptoms at baseline (defined as total NPI score >0), NPI data were obtained approximately 18 months later on 117 who were alive and available for follow-up. Results Eighty-one percent of those with neuropsychiatric symptoms at baseline (defined as total NPI score>0) continued to have at least one symptom at follow-up. Sixty-seven percent of participants with a clinically significant total NPI score (defined as ,;4) at baseline continued to have a clinically significant total NPI score at follow-up. Among the ten neuropsychiatric domains assessed at baseline, delusions persisted in 65.5% of individuals, followed by depression (58.3%), and aberrant motor behavior (55.6%), while hallucinations and disinhibition persisted in only 25.0% and 11.1% respectively. In participants who were symptomatic at both baseline and follow-up, the mean severity scores at the two observation points were comparable in all ten neuropsychiatric domains. Conclusions Neuropsychiatric symptoms in dementia overall were highly persistent. Among those in whom symptoms did persist, symptom severity a year and a half later appeared to be comparable. Copyright © 2004 John Wiley & Sons, Ltd. [source] Treatment of Premature Calves with Clinically Diagnosed Respiratory Distress SyndromeJOURNAL OF VETERINARY INTERNAL MEDICINE, Issue 2 2008T. Karapinar Background: Respiratory distress syndrome (RDS) has been reported previously in premature calves. However, there have been no published data on the effect of surfactant replacement therapy in the treatment of premature calves with RDS. Hypothesis: Surfactant replacement therapy added to the standard treatment for premature calves clinically diagnosed with RDS would increase the viability of the calves. Animals: Twenty-seven premature calves with clinically diagnosed RDS. Methods: Twenty calves were instilled intratracheally with bovine lung surfactant extract and provided with standard treatment for RDS (surfactant group). Seven calves were given only standard care for RDS without surfactant therapy and placed in the control group. Standard treatment for newborn calves with RDS includes warming, administration of intranasal oxygen, fluid replacement, administration of antibiotics, and immunoglobulin solution. Arterial blood samples were collected from the calves at 3 observation points, the first just before treatment (hour 0) and at 2 hours (hour 2) and 24 hours (hour 24) after treatment was started to determine if ventilation was adequate, improving, or deteriorating. Blood gases, pH, bicarbonate, and lactate concentrations were measured. Results: In the surfactant group, mean partial pressure of oxygen significantly increased at hours 2 and 24. Mean partial pressure of carbon dioxide decreased and mean arterial blood pH increased at hour 24 in the surfactant group compared with the control group (P < .05). Of the 20 calves in the surfactant group, 12 survived and 8 died. All 7 calves in the control group died. Conclusions and Clinical Importance: The results of this study suggest that surfactant replacement therapy may reduce neonatal deaths in premature calves with clinically diagnosed RDS. [source] Surgery for chronic rhinosinusitis may improve sleep and sexual function,THE LARYNGOSCOPE, Issue 8 2010Michael S. Benninger MD Abstract Objectives/Hypothesis: This study was designed to evaluate the impact of surgery on the sexual function and sleep function of patients with chronic rhinosinusitis (CRS). Study Design: A retrospective review of a cohort of prospectively enrolled patients with chronic rhinosinusitis who have undergone endoscopic sinus surgery. Methods: Each patient completed the Rhinosinusitis Disability Index (RSDI) prior to surgery and at least nine months following endoscopic sinus surgery, and the preoperative and postoperative scores for the questions related to sleep and sexual activity were evaluated. Wilcoxon signed-rank test was used to assess the magnitude and direction of change between observation points. Results: Mean response scores regarding sexual activity between preoperative (1.1 ± 1.0) and postoperative scores (0.7 ± 0.8) are significantly different (P < .001). Mean response scores regarding sleep dysfunction between preoperative (2.4 ± 1.0) and postoperative scores (1.5 ± 1.1) are also significantly different (P < .001). For both questions, a higher frequency of subjects responded "never" and "almost never" in the postoperative period compared with preoperative measures. Conclusions: Using the questions from the RSDI, there is an improvement in scores of sexual function and sleep after surgery for patients with chronic rhinosinusitis. Further, more in-depth evaluations of these potential benefits are needed. Laryngoscope, 2010 [source] | ||||||||||||||||