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A Design Method for Cascades Consisting of Circular Arc Blades with Constant Thickness
Bian, Tao,Han, Qianpeng,Bohle, Martin Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.1
Many axial fans have circular arc blades with constant thickness. It is still a challenging task to calculate their performance, i.e. to predict how large their pressure rise and pressure losses are. For this task a need for cascade data exists. Therefore, the designer needs a method which works quickly for design purposes. In the present contribution a design method for such cascades consisting of circular arc blades with constant thickness is described. It is based on a singularity method which is combined with a CFD-data-based flow loss model. The flow loss model uses CFD-data to predict the total pressure losses. An interpolation method for the CFD-data are applied and described in detail. Data of measurements are used to validate the CFD-data and parameter variations are conducted. The parameter variations include the variation of the camber angle, pitch chord ratio and the Reynolds number. Additionally, flow patterns of two dimensional cascades consisting of circular arc blades with constant thickness are shown.
A Design Method for Cascades Consisting of Circular Arc Blades with Constant Thickness
Tao Bian,Qianpeng Han,Martin Bohle 한국유체기계학회 2017 International journal of fluid machinery and syste Vol.10 No.1
Many axial fans have circular arc blades with constant thickness. It is still a challenging task to calculate their performance, i.e. to predict how large their pressure rise and pressure losses are. For this task a need for cascade data exists. Therefore, the designer needs a method which works quickly for design purposes. In the present contribution a design method for such cascades consisting of circular arc blades with constant thickness is described. It is based on a singularity method which is combined with a CFD-data-based flow loss model. The flow loss model uses CFD-data to predict the total pressure losses. An interpolation method for the CFD-data are applied and described in detail. Data of measurements are used to validate the CFD-data and parameter variations are conducted. The parameter variations include the variation of the camber angle, pitch chord ratio and the Reynolds number. Additionally, flow patterns of two dimensional cascades consisting of circular arc blades with constant thickness are shown.
Super-atom molecular orbital excited states of fullerenes
Johansson, J. Olof,Bohl, Elvira,Campbell, Eleanor E. B. Royal Society 2016 Philosophical transactions. Series A, Mathematical Vol.374 No.2076
<P>This article is part of the themed issue 'Fullerenes: past, present and future, celebrating the 30th anniversary of Buckminster Fullerene'.</P>
Postoperative Fever Evaluation Following Lumbar Fusion Procedures
Benjamin C. Mayo,Brittany E. Haws,Daniel D. Bohl,Philip K. Louie,Fady Y. Hijji,Ankur S. Narain,Dustin H. Massel,Benjamin Khechen,Kern Singh 대한척추신경외과학회 2018 Neurospine Vol.15 No.2
Objective: This study aimed to determine the incidence of postoperative fever, the workup conducted for postoperative fever, the rate of subsequent fever-related diagnoses or complications, and the risk factors associated with fever following lumbar fusion. Methods: A retrospective review of patients undergoing lumbar fusion was performed. For patients in whom fever (≥38.6°C) was documented, charts were reviewed for any fever workup or diagnosis. Multivariate regression was used to identify independent risk factors for the development of postoperative fever. Results: A total of 868 patients met the inclusion criteria, of whom 105 exhibited at least 1 episode of fever during hospitalization. The first documentation of fever occurred during the first 24 hours in 43.8% of cases, during postoperative hours 24–48 in 53.3%, and later than 48 hours postoperatively in 2.9%. At least 1 component of a fever workup was conducted in 47 of the 105 patients who had fever, resulting in fever-associated diagnoses in 4 patients prior to discharge. Three patients who had fever during the inpatient stay developed complications after discharge. On multivariate analysis, operations longer than 150 minutes (relative risk [RR], 1.66; p=0.015) and narcotic consumption greater than 85 oral morphine equivalents on postoperative day 0 (RR, 1.53; p=0.038) were independently associated with an increased risk of developing postoperative fever. Conclusion: The results of this study suggest that inpatient fever occurred in roughly 1 in 8 patients following lumbar fusion surgery. In most cases where a fever workup was performed, no cause of fever was detected. Longer operative time and increased early postoperative narcotic use may increase the risk of developing postoperative fever.
Philip K. Louie,Andrew C. Sexton,Danel D. Bohl,Ehsan Tabaraee,Steven M. Presciutti,Benjamin C. Mayo,Justin C. Paul,Comron Saifi,Howard S. An 대한척추신경외과학회 2020 Neurospine Vol.17 No.1
Objective: To determine the risk factors associated with radiographic changes and clinical outcomes following 3-level anterior cervical discectomy and fusion (ACDF) using rigidplate constructs and cortico-cancellous allograft. ACDF has demonstrated efficacy for treatment of multilevel degenerative cervical conditions, but current data exists in small heterogeneous forms. Methods: A retrospective review included 98 patients with primary 3-level ACDF surgery at one institution from 2008 to 2013 with minimum 1-year follow-up. Cervical sagittal vertical axis (SVA), segmental height, fusion, and lordosis radiographs were measured preoperatively and at 2 postoperative periods. Results: Rates of asymptomatic pseudarthroses and total reoperations were 18% and 4%, respectively. Results demonstrated immediate improvements in cervical lordosis (5.5°, p<0.01) and segmental height (5.0-mm increase, p<0.01) with little changes in the cervical SVA (3.2-mm increase, p<0.01). The segmental height decreased from immediate postoperative period to final follow-up (1.7-mm decrease, p<0.01). Older age was protective against radiolucent lines (p<0.05). Patient-reported outcomes significantly improved following surgery (p<0.01). Current smoking status and diagnosis of diabetes mellitus had no impact on radiographic or clinical outcomes. Risk factors were not identified for the 5 reoperations (4%). Conclusion: Three-level ACDF with rigid-plating and cortico-cancellous allograft is an effective procedure for degenerative diseases of the cervical spine without the application of additional adjuncts or combined anteriorposterior cervical surgeries. Significant improvements in cervical lordosis, segmental height, and segmental alignment can be achieved with little change in cervical SVA and a low rate of reoperations over short-term follow-up. Similarly, patient-reported outcomes show significant improvements.
Acceleration of electrons in the plasma wakefield of a proton bunch
Adli, E.,Ahuja, A.,Apsimon, O.,Apsimon, R.,Bachmann, A.-M.,Barrientos, D.,Batsch, F.,Bauche, J.,Berglyd Olsen, V. K.,Bernardini, M.,Bohl, T.,Bracco, C.,Braunmü,ller, F.,Burt, G.,Buttenschö,n, Springer Science and Business Media LLC 2018 Nature Vol.561 No.7723