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Bubble size characteristics in the wake of ventilated hydrofoils with two aeration configurations
John S Gulliver,Ashish Karn,Christopher R Ellis,Christopher Milliren,Jiarong Hong,David Scott,Roger E.A. Arndt 한국유체기계학회 2015 International journal of fluid machinery and syste Vol.8 No.2
Aerating hydroturbines have recently been proposed as an effective way to mitigate the problem of low dissolved oxygen in the discharge of hydroelectric power plants. The design of such a hydroturbine requires a precise understanding of the dependence of the generated bubble size distribution upon the operating conditions (viz. liquid velocity, air ventilation rate, hydrofoil configuration, etc.) and the consequent rise in dissolved oxygen in the downstream water. The purpose of the current research is to investigate the effect of location of air injection on the resulting bubble size distribution, thus leading to a quantitative analysis of aeration statistics and capabilities for two turbine blade hydrofoil designs. The two blade designs differed in their location of air injection. Extensive sets of experiments were conducted by varying the liquid velocity, aeration rate and the hydrofoil angle of attack, to characterize the resulting bubble size distribution. Using a shadow imaging technique to capture the bubble images in the wake and an in-house developed image analysis algorithm, it was found that the hydrofoil with leading edge ventilation produced smaller size bubbles as compared to the hydrofoil being ventilated at the trailing edge.
Roger Li,Firas G. Petros,Janet B. Kukreja,Stephen B. Williams,John W. Davis 대한비뇨의학회 2016 Investigative and Clinical Urology Vol.57 No.-
The practice of extended pelvic lymph node dissection (ePLND) remains one of the most controversial topics in the management of clinically localized prostate cancer. Although most urologists agree on its benefit for staging and prognostication, the role of the ePLND in cancer control continues to be debated. The increased perioperative morbidity makes it unpalatable, especially in patients with low likelihood of lymph node disease. With the advent of robotic assisted laparoscopic prostatectomy, many surgeons were slow to adopt ePLND in the robotic setting. In this study, we summarize the evidence for the prognostic and therapeutic roles of ePLND, review the clinical tools used for lymph node metastasis prediction and survey the numerous experiences of ePLND compiled by robotic urologic surgeons over the years.
OH + Isoprene: A Direct Dynamics Study
전지혜,John Roger Barker,송기형 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.6
The products and mechanisms active in the isoprene + OH reaction were investigated using the direct dynamics method. High energies were used in order to identify every possible reaction channel. The trajectories were classified as dissociative and nondissociative, depending on whether fragmentation occurred during the 4 ps time window of the simulations. The nondissociative trajectories were further classified as radical additions, rearrangements, and cyclizations. The most dominant category was the addition of OH to the carbons of isoprene to form adducts. Some adducts react further by isomerization and cyclization. The dissociative trajectories were classified as hydrogen abstractions, substitutions, and eliminations. Among these, the dominant category was direct hydrogen abstraction to produce H2O and a free radical. At higher energies, more reaction was observed. In simulations at 300K, the only reaction category observed was OH addition to the double bonds in isoprene to form adducts.