Home About us Contact
|
Home About us Contact | ||
|
|
||
Average Period (average + period)
Selected AbstractsHYDROLOGIC SIMULATION OF THE LITTLE WASHITA RIVER EXPERIMENTAL WATERSHED USING SWAT,JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION, Issue 2 2003Michael W. Van Liew ABSTRACT: Precipitation and streamflow data from three nested subwatersheds within the Little Washita River Experimental Watershed (LWREW) in southwestern Oklahoma were used to evaluate the capabilities of the Soil and Water Assessment Tool (SWAT) to predict streamflow under varying climatic conditions. Eight years of precipitation and streamflow data were used to calibrate parameters in the model, and 15 years of data were used for model validation. SWAT was calibrated on the smallest and largest sub-watersheds for a wetter than average period of record. The model was then validated on a third subwatershed for a range in climatic conditions that included dry, average, and wet periods. Calibration of the model involved a multistep approach. A preliminary calibration was conducted to estimate model parameters so that measured versus simulated yearly and monthly runoff were in agreement for the respective calibration periods. Model parameters were then fine tuned based on a visual inspection of daily hydrographs and flow frequency curves. Calibration on a daily basis resulted in higher baseflows and lower peak runoff rates than were obtained in the preliminary calibration. Test results show that once the model was calibrated for wet climatic conditions, it did a good job in predicting streamflow responses over wet, average, and dry climatic conditions selected for model validation. Monthly coefficients of efficiencies were 0.65, 0.86, and 0.45 for the dry, average, and wet validation periods, respectively. Results of this investigation indicate that once calibrated, SWAT is capable of providing adequate simulations for hydrologic investigations related to the impact of climate variations on water resources of the LWREW. [source] Contribution of a Pacemaker Bradycardia Detection Algorithm in the Study of Patients with Carotid Sinus SyndromePACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 6 2001PIERRE GRAUX GRAUX, P., et al.: Contribution of a Pacemaker Bradycardia Detection Algorithm in the Study of Patients with Carotid Sinus Syndrome. While carotid sinus syndrome (CSS) is often suspected as a cause of syncope in the elderly, whether it represents an indication for cardiac pacing may remain uncertain. Bradycardia algorithms included in pacemakers are now able to establish a precise relationship between spontaneous asystole and occurrence of symptoms and strengthen the indication for permanent pacing. This study included seven men and three women (70.5 ± 7.3 years of age) who, over an average period of 54.1 ± 17 months, had suffered from syncope (12.6 episodes/patient) and presyncope (11.2 episodes/patient) attributed to pure cardioinhibition (2 patients) or mixed CSS (8 patients). Other sources of symptoms were excluded by thorough clinical evaluations, including Holter monitoring, echocardiography, and electrophysiological testing. All patients received a CHORUS 6234 pacemaker, the memory of which includes a dedicated bradycardia detection algorithm capable of storing atrial and ventricular chains, and date and time of the last ten pauses and/or bradycardic events. After a initial period of 14.7 ± 8 months, during which symptoms were suppressed, the bradycardia algorithm was activated. From then on, a cumulative increase in the number of patients presenting with diurnal pauses was measured (1 month, n = 0; 3 months, n = 6; 9 months, n = 7; 2 years, n = 8). Fourteen episodes of diurnal asystole were recorded. The mean duration of the longest episodes of spontaneous ventricular standstill was 6,319 ± 1,615 ms and was due to sinoatrial block (n = 7), atrioventricular block (n = 5), and a combination of both (n = 2). In conclusion, activation of the CHORUS bradycardia algorithm allowed confirmation of the appropriateness of permanent pacing in a majority of patients suffering from CSS. [source] Soft measurement of pulp suspension flow velocity based on wavelet transformTHE CANADIAN JOURNAL OF CHEMICAL ENGINEERING, Issue 1 2010Qiang Zhou Abstract A soft measurement technique is presented, which the pulp suspension flow velocity (PSFV) can be obtained by analysis of pulp fibre consistency signal without using the flow sensor or flow meter. Doppler Effect in pulp fibre consistency signal, which is caused by the relative motion between pulp suspension flowing in pulp pipe and consistency sensor fixed in the pipe, is discovered on the basis of studying the structure of pulp suspension and the properties of pulp fibre consistency signal, and it is proved by wavelet transform (WT) in this paper. WT are used to analyse pulp fibre consistency signal based on Doppler Effect. PSFV can be determined by the average period of WT which is used to analyse pulp fibre consistency signal based on Doppler Effect. The corresponding tests indicate that the measurement technique is feasible with high precision and better dynamic characteristics. Une technique de mesurage douce est présentée selon laquelle la vélocité de débit de suspension de pâte (pulp suspension flow velocity - PSFV) peut être obtenue par analyse du signal de la consistance de la pâte sans faire appel à des détecteurs de débit ou à des débitmètres. L'effet Doppler dans le signal de consistance de la pâte, causé par le mouvement relatif entre la pâte en suspension s'écoulant dans la conduite de pâte et le senseur de consistance fixé dans la conduite, a été découvert en se basant sur l'étude de la structure de la pâte en suspension et les propriétés du signal de consistance de la pâte et il est prouvé par transformation d'ondelettes. La masse atomique est utilisée pour analyser le signal de consistance de la pâte basée sur l'effet Dopler. Le PSFV peut être déterminé par la période moyenne de la masse atomique utilisée pour analyser la consistance de la fibre de la pâte s'appuyant sur l'effet Dopler. Les essais correspondants indiquent que la technique de mesurage est réalisable avec grande précision et de meilleures caractéristiques dynamiques. [source] Nonsurgical Management of Parapharyngeal Space Infections: A Prospective StudyTHE LARYNGOSCOPE, Issue 5 2002Jean-Yves Sichel MD Abstract Objective/Hypothesis Parapharyngeal infections, which can potentially cause life-threatening complications, may, in certain cases, be treated conservatively with no need for surgical drainage. A review of the literature reveals that the most recommended treatment of parapharyngeal infection is surgical drainage combined with intravenous antibiotic therapy. Several retrospective reports recommend conservative treatment with no surgical drainage. Study Design Prospective, nonrandomized. Methods A prospective study was performed on all patients with an infection limited to the parapharyngeal space. Results Twelve patients presented with clinical and radiological diagnosis of parapharyngeal infection during a 5-year period. Five patients showed obvious presence of pus in other spaces and therefore were excluded. Seven patients with no gross extension into other spaces and with no respiratory distress or septic shock were treated with intravenous amoxicillin-clavulanic acid for 9 to 14 days (average period, 11 days). All patients except one were children. All were cured with conservative management, and no surgical drainage was needed. None had any complications. Conclusion Our results confirm the effectiveness of nonsurgical treatment of infections limited to the parapharyngeal space, at least in the pediatric population. [source] Experience with adalimumab for the treatment of non-infectious uveitisACTA OPHTHALMOLOGICA, Issue 2009B DOBNER Purpose Objective: The aim of this study has been to assess the efficacy of adalimumab (ADA) in patients with uveitis in 3 centers. Methods In a retrospective study we identified patients from all instituitions´databases, who were treated with ADA in an average period of 20.16 months (range 1.3-45 months). The 5 criteria that the efficacy of ADA had been judged on are: reduction of macular edema by OCT, visual acuity, anterior chamber cells, reduction of flares and a reduction of prednisone dose during the treatment. At least one of the criteria had to be improved and none of the others worsened to declare treatment as effective. Results Of the 61 patients who were treated with ADA, 38 were treated for uveitis and systemic disease, 3 primarily for active systemic disease and 20 primarily for active uveitis. 15 patients had been treated before with etanercept and 11 with infliximab, with insufficient response. We saw an improvement in 49 out of these 61 patients (80,3%) in 1 or more criteria and worsening in none, 5 patients did not meet improvement criteria and were given additional or alternative treatment, three of them mainly due to activity of systemic disease. 14 out of 49 (28,6%)Patients showed an Improvement in every criteria, the other patients showed increasing in at least one criteria, the other criterias remained stable. At the last follow-up there were 50 (81,9%) patients still on ADA treatment. 11 patients stopped ADA treatment for different reasons (inefficacy, active systemic disease, pregnancy etc.). Conclusion In this retrospective study we judged that the treatment with ADA in patients with uveitis with or without systemic disease was effective in 80,3%. Clinical trials are warrented Commercial interest [source] Clinical and Radiographic Evaluation of the 5-mm Diameter Regular-Platform Brånemark Fixture:2- to 5-Year Follow-upCLINICAL IMPLANT DENTISTRY AND RELATED RESEARCH, Issue 1 2002DSc Odont, Georges Tawil DDS ABSTRACT Purpose: The purpose of this study was to report the clinical results obtained with 5-mm diameter regular-platform Brånemark implants after 2 to 5 years of follow-up. A secondary aim was to compare the clinical outcome to that of adjacently placed standard 3.75-mm fixtures in the same patients under the same operative condition and in the same prosthetic construction. Materials and Methods: Sixty patients, with a mean age of 54 years, received a total of 97 5-mm diameter regular-platform fixtures. The majority of the implants were placed at molar sites. In 41 of the patients, 53 5-mm diameter implants were placed adjacent to 62 standard 3.75-mm diameter fixtures in the same prosthetic reconstruction. All implants were submerged for an average period of 4 to 6 months. Abutment connection was done according to standard protocol. The prosthetic treatment consisted of freestanding fixed bridges. Results: The cumulative survival rate of the 5-mm diameter implants loaded for a period of 2 to 5 years was 96.9%. Only three implants failed. They were placed in type 4 bone in the posterior maxilla. Bone loss over the first year was 0.70 mm and over a 3-year period 0.81 mm. Implants placed in type 4 bone showed significantly higher bone loss. No difference in the resorption rate could be found between the maxillary and the mandibular implants or between the various implant lengths. There was no significant difference between the bone loss around the 5-mm diameter fixtures and the adjacent 3.75-mm diameter standard fixtures. Conclusion: The present study demonstrated a high predictability of 5-mm diameter regular-platform implants when placed in the posterior maxilla and mandible. [source] | ||||||||||