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TULIP-治疗83例病人的经验
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作者 H.Schulze W.Martin +3 位作者 P.Hoch W.Finke T.Senge 胡志全 《德国医学》 CAS 1996年第2期65-66,共2页
1991年5月至1993年12月对83例 BPH 所致的膀胱下梗阻病人采用 TULIP 系统(经尿道超声引导激光前列腺切除术)治疗,并研究其疗效。目前的经验证明这一疗法有客观效果,我们还对其结果进行 TULIP 和 TURP 的随机对比研究。
关键词 TULIP 前列腺切除术 前列腺增生
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Do Immaturity, Dehydratation or Alkalosis Predispose to Intraoperative Complications at Pyloromyotomy?
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作者 Ralf-Bodo Tröbs Lars Burghardt +1 位作者 Micha Bahr Matthias Nissen 《Open Journal of Pediatrics》 2016年第3期203-212,共10页
Background: Hypertrophic pyloric stenosis is the most important cause for propulsive non-bilious vomiting in infants of the first trimester. Extramucous splitting of the hypertrophic pyloric muscle is the surgical gol... Background: Hypertrophic pyloric stenosis is the most important cause for propulsive non-bilious vomiting in infants of the first trimester. Extramucous splitting of the hypertrophic pyloric muscle is the surgical gold standard for treatment. Serious major complications of pyloromyotomy (PM) are mucosal perforation and incomplete muscle splitting. The aim of the presented study is to find out if intraoperative complications are predisposed by biometric or biochemical factors. Furthermore, we looked for the influence of the board certification of the primary surgeon. Patients and Methods: 162 infants with IHPS were operated during a six-year period (n = 150 laparoscopic operations). We had 8 major complications (4.9%): iatrogenic mucosal perforation occurred in 6 cases, and incomplete PM in 2 infants. Preoperative demographic data and data resulting from the blood acid-base- and ion-analysis were compared with data of a previously published reference group from our institution (Tr?bs RB. Open J Pediatr, 2014;4: 208-215). Results: The duration of vomiting, the grade of dehydration and the severity of blood alkalosis did not differ between both groups. Furthermore, we found no influence of the gestational age and birth weight on the occurrence of intraoperative complications. It seems that early postnatal age (p = 0.07) and low body weight at surgery (p = 0.055) may contribute to surgical problems. Board certification as a paediatric surgeon did not influence the rate of intraoperative complications. Conclusions: Laboratory data did not show any predisposition to intraoperative complications. It is assumed that small infants with early occurring symptoms carry an elevated risk for intraoperative events. Our data support the hypothesis that the rate of intraoperative complications at PM is mainly influenced by skills and experience of the surgeon. 展开更多
关键词 Hypertrophic Pyloric Stenosis PYLOROMYOTOMY COMPLICATION PERFORATION ALKALOSIS Surgical Training
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Low Friction Sliding Planes of Greased PTFE for High Contact Pressures
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作者 Lennart Bocklenberg Karsten Winkler +1 位作者 Peter Mark Stefan Rybarz 《Open Journal of Civil Engineering》 2016年第2期105-116,共12页
Sliding planes of PTFE are commonly used because of their excellent tribological properties. However, especially in cases of high contact pressures, PTFE suffers from its comparatively poor mechanical properties. This... Sliding planes of PTFE are commonly used because of their excellent tribological properties. However, especially in cases of high contact pressures, PTFE suffers from its comparatively poor mechanical properties. This paper presents a sliding construction developed within an innovative experimental test-setup to enable experimental investigation of large-scale concrete members subjected to punching shear. To fulfill the special demands of the new test-setup, greased, only 0.5 mm thin sheets of PTFE were used to minimize friction between the bearing construction and the test specimen. This highly effective sliding construction leads to a dynamic friction coefficient μ<sub>d,max</sub> between 0.0065 and 0.0035 while the static friction coefficient μ<sub>s</sub> remains below 0.0048. Simultaneously, compressive axial stresses of more than 60 MPa occur. The paper highlights major aspects of the sliding plane’s development and demonstrates its sliding abilities. 展开更多
关键词 Sliding Plane PTFE Innovative Test-Setup EXPERIMENTS
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CVD Coating of Oxide Particles for the Production of Novel Particle-Reinforced Iron-Based Metal Matrix Composites
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作者 Sebastian Brust Arne Röttger Werner Theisen 《Open Journal of Applied Sciences》 2016年第4期260-269,共10页
This paper focuses on surface metallization of oxide particles by means of titanium nitride (TiN) thin films for the production of highly wear-resistant metal matrix composites (MMC) on Fe-base for wear protection app... This paper focuses on surface metallization of oxide particles by means of titanium nitride (TiN) thin films for the production of highly wear-resistant metal matrix composites (MMC) on Fe-base for wear protection applications. These powder-metallurgically produced materials consist of a metallic matrix with embedded oxide hard-particles such as alumina or zirconia. The poor wettability of these oxides by iron-base melts and the resulting weak bonding between the components lead to porous materials and weak tribomechanical properties, thus limiting the material’s application range. To counteract such problems, this paper describes a processing route in which the oxide particles are pre-metallized by application of a thin TiN coating by means of chemical vapor deposition (CVD). This surface metallization should increase the wettability and bonding behavior between the ionically bonded particles and the iron-base alloy, which should improve the mechanical and tribological properties. Therefore, a CVD device for coating ceramic particles was constructed and is described in this paper. Furthermore, coatings deposited on the ceramic sub-strates were investigated by means of RBS, SEM and XRD. In addition, the feasibility of producing metal matrix composites (MMC) by admixing the TiN-coated oxide particles with a Fe-base alloy and their further densification by supersolidus liquid-phase sintering is demonstrated. 展开更多
关键词 Chemical Vapor Deposition Particle Coating METALLIZATION Metal Matrix Composites Reactive Wetting
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碘化N-正丁基氟哌啶醇对豚鼠心房肌细胞乙酰胆碱敏感性钾通道的影响 被引量:5
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作者 刘冰 石刚刚 +1 位作者 高分飞 Lutz Pott 《中国药理学通报》 CAS CSCD 北大核心 2005年第5期544-550,共7页
目的研究碘化N正丁基氟哌啶醇(F2)对豚鼠心房肌细胞乙酰胆碱敏感性钾通道(KACh)的影响,探讨其对KACh的作用机制。方法采用膜片钳全细胞记录方法,测定F2对原代培养的豚鼠心房肌细胞乙酰胆碱敏感性钾电流IK(ACh)的影响。结果细胞外给予F2... 目的研究碘化N正丁基氟哌啶醇(F2)对豚鼠心房肌细胞乙酰胆碱敏感性钾通道(KACh)的影响,探讨其对KACh的作用机制。方法采用膜片钳全细胞记录方法,测定F2对原代培养的豚鼠心房肌细胞乙酰胆碱敏感性钾电流IK(ACh)的影响。结果细胞外给予F2对豚鼠心房肌细胞IK(ACh)呈可逆性、浓度依赖性的阻断作用。细胞内添入抗水解的GTP类似物GTPγS后,结果同前。细胞内给予50μmol·L-1F2对IK(ACh)无作用。结论F2是豚鼠心房肌细胞KACh的一种快速通道阻断剂,发挥作用部位在细胞膜外侧,作用位点在钾通道本身,与乙酰胆碱受体无关。 展开更多
关键词 碘化N-正丁基氟哌啶醇 心房肌细胞 乙酰胆碱敏感性钾通道(KACh) 膜片钳全细胞记录 G蛋白激活钾通道
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18MW燃气轮机低氧化氮燃烧室火焰护罩冷却传热分析 被引量:1
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作者 汪军 杨玮 M.Fiebig 《能源研究与信息》 1998年第3期36-43,共8页
本文基于试验和设计数据,对18 MW燃气轮机低氧化氮燃烧室内筒体和环形冷却流道进行了传热分析.结果表明:为了保证在其额定工况下火焰护罩的温度不超过其材料的允许值,必须采取有效的措施,对火焰护罩外侧的空气冷却过程加以适当的强化.
关键词 壁面温度 强化传热 冷却 燃气轮机 燃烧室
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