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大型汽轮发电机端部三维温度场研究 被引量:10
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作者 杜炎森 黄学良 +1 位作者 刘磊 胡敏强 《中国电机工程学报》 EI CSCD 北大核心 1996年第2期95-101,共7页
本文建立了汽轮发电机端部温度场数学模型。应用传热学理论就有关散热系数、等效热传导系数以及发电机压圈水管温度分布等问题作了研究。本文以QFS-300-2型发电机为例,计算了二台机组十多个工况的端部温度场分布,每一结果都... 本文建立了汽轮发电机端部温度场数学模型。应用传热学理论就有关散热系数、等效热传导系数以及发电机压圈水管温度分布等问题作了研究。本文以QFS-300-2型发电机为例,计算了二台机组十多个工况的端部温度场分布,每一结果都与实测结果十分吻合。本文通过温度场的计算,首次给出合端部温升限制条件的发电机安全运行P-Q容量图。本文最后还研究了不同冷却方案时的端部温度场分布,为进一步改进汽轮发电机端部结构设计提供理论依据。 展开更多
关键词 汽轮发电机 温度场 数学模型
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Urine Flow Acceleration Is Superior to Qmax in Diagnosing BOO in Patients with BPH 被引量:3
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作者 文建国 崔林刚 +5 位作者 李一冬 尚小平 朱文 张瑞莉 孟庆军 张胜军 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2013年第4期563-566,共4页
Summary: We performed a retrospective, case-control study to evaluate whether the urine flow acceleration (UFA, mL/s2) is superior to maximum uroflow (Qmax, mL/s) in diagnosing bladder outlet obstruction (BOO) ... Summary: We performed a retrospective, case-control study to evaluate whether the urine flow acceleration (UFA, mL/s2) is superior to maximum uroflow (Qmax, mL/s) in diagnosing bladder outlet obstruction (BOO) in patients with benign prostatic hyperplasia (BPH). In this study, a total of 50 men with BPH (age: 58±12.5 years) and 50 controls (age: 59±13.0 years) were included. A pressure-flow study was used to determine the presence of BOO according to the recommendations of Incontinence Control Society (ICS). The results showed that the UFA and Qmax in BPH group were much lower than those in the control group [(2.05±0.85) vs. (4.60±1.25) mL/s2 and (8.50±1.05) vs. (13.00±3.35) mL/s] (P〈0.001). Accol;ding to the criteria (UFA〈2.05 mL/s2, Qmax〈10 mL/s), the sensitivity and specificity of UFA vs. Qmax in diagnosing BOO were 88%, 75% vs. 81%, 63%. UFA vs. Omax, when compared with the results of P-Q chart (the kappa values in corresponding analysis), was 0.55 vs. 0.35. The pros- tate volume, post void residual and detrusor pressure at Qmax between the two groups were 28.6±9.8 vs. 24.2±7.6 mL, 60.4±1.4 vs. 21.3±2.5 mL and 56.6±8.3 vs. 21.7±6.1 cmHzO, respectively (P〈0.05). It was concluded that the UFA is a useful urodynamic parameter, and is superior to Qmax in diagnosing BOO in patients with BPH. 展开更多
关键词 benign prostate hyperplasia (BPH) bladder outlet obstruction (BOO) urine flow accelera-tion (UFA) Qmax p-q chart
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