缝隙扩压叶栅近壁流场与流动损失实验

为了探索缝隙射流对高负荷扩压叶栅气动性能与近壁流场结构的影响机制,实验研究了设计冲角下有/无缝隙结构的高负荷弯曲扩压叶栅近壁流场结构与出口气动损失分布规律,获得了叶片近壁压力场数据、流动图谱以及叶栅出口流动损失参数。结果表明,缝隙两端压差导致的从叶片压力面到吸力面的射流能够增加附面层高熵流体的能量,缝隙射流将局部积聚的低能流体及时引向主流,减小高熵流体在叶展中部或端区掺混撞击,抑制了栅后尾迹高熵流体的过度聚集,从而有效提高高负荷压气机叶栅气动性能。      

痹祺胶囊联合刃针治疗膝骨性关节炎的疗效观察

目的 探究痹祺胶囊联合刃针治疗早期膝骨性关节炎（knee osteoarthritis,KOA）的疗效。方法 采用随机数字表法将70例KOA患者随机分成2组,各35例。2组患者均用刃针治疗,1次/周,共2次;对照组患者联合口服塞来昔布胶囊200 mg/次,1次/d;试验组患者联合口服痹祺胶囊1.2 g/次,3次/d;治疗14 d。比较治疗前后及3个月随访的视觉模拟评分（visual analogue scale,VAS）及西安大略和麦克马斯特大学（Western Ontario and McMaster University,WOMAC）骨关节炎指数量表评分来判定疗效。结果 纳入研究的70例KOA患者中有8例脱落,共有62例纳入分析。2组治疗后VAS及WOMAC评分较治疗前均显著降低（P<0.01）,但对照组比试验组的VAS分值降低更明显（P<0.05）,WOMAC评分在治疗2周后和3个月随访均为试验组降低更明显（P<0.05）。治疗2周后,2组有效率较接近（试验组96.9%,对照组90%）,3个月随访试验组有效率（93.8%）优于对照组（63.3%）（P<0.01）。结论 采用痹祺胶囊联合刃针与塞来昔布联合刃针治疗KOA均疗效显著,但痹祺胶囊联合刃针改善关节功能更明显,且疗效更稳定持久。     

刃针搜法治疗脑梗死后感觉障碍的临床研究

目的:探究刃针搜法治疗脑梗死后感觉障碍的临床作用机制。方法:将90例脑梗死后感觉障碍患者随机分为刃针治疗组、针刺对照组、药物对照组,每组30例。3组患者分别治疗14 d,评价治疗效果,并进行治疗前后的血液流变学、神经元功能、血流动力学、体感诱发电位等相关指标检测。结果:治疗后刃针治疗组疗效明显高于其他两组,差异有统计学意义(P<0.05)。与治疗前比较,3组患者治疗后Fugl-Meyer评分显著提高(P<0.05);患侧体感诱发电位(SEP)N20潜伏期明显缩短(P<0.05)、波幅明显增高(P<0.05);血浆粘度、血小板聚集率、纤维蛋白原等血液流变学指标明显改善(P<0.05);血清S100B、基质金属蛋白酶-9(MMP-9)显著下降(P<0.05),金属蛋白酶组织抑制剂-1(TIMP-1)显著升高(P<0.05);病侧大脑中动脉舒张末期血流速度(Vd)、收缩期最大血流速度(Vs)、平均血流速度(Vm)显著升高;刃针治疗组上述指标变化较药物对照组和针刺对照组显著(P<0.05)。结论:刃针搜法通过改善脑梗死后感觉障碍患者脑部组织血液循环和供血情况、改善神经元功能、促进感觉神经传导通路修复等作用机制达到治疗效果。     

The Springer Model for Lifetime Prediction of Wind Turbine Blade Leading Edge Protection Systems: A Review and Sensitivity Study

The wind energy sector is growing rapidly. Wind turbines are increasing in size, leading to higher tip velocities. The leading edges of the blades interact with rain droplets, causing erosion damage over time. In order to mitigate the erosion, coating materials are required to protect the blades. To predict the fatigue lifetime of coated substrates, the Springer model is often used. The current work summarizes the research performed using this model in the wind energy sector and studies the sensitivity of the model to its input parameters. It is shown that the Springer model highly depends on the Poisson ratio, the strength values of the coating and the empirically fitted a2 constant. The assumptions made in the Springer model are not physically representative, and we reasoned that more modern methods are required to accurately predict coating lifetimes. The proposed framework is split into three parts—(1) a contact pressure model, (2) a coating stress model and (3) a fatigue strength model—which overall is sufficient to capture the underlying physics during rain erosion of wind turbine blades. Possible improvements to each of the individual aspects of the framework are proposed.     

眼眶磁共振扫描blade技术和常规技术对信噪比的影响

目的通过常规技术和Blade技术检查眼眶疾病患者图像信噪比,探讨Blade技术对伪影发生、影像质量的改善情况。方法选取2012-07至2013-06行眼眶磁共振扫描的患者,并且行常规眼眶Tse T2WI序列扫描时显现不同程度的不自主运动伪影,最终纳入136例。采用德国西门子公司Trio Tim3．0T超导磁共振成像系统,以在相同位置对所有患者先后进行常规磁共振扫描和Blade技术扫描,并以常规磁共振扫描图像的图像质量分级,将136例分为轻度、中度和重度伪影组,获取不同组两种扫描图像的信噪比,从而评价Blade技术对图像质量的改善情况。结果轻度伪影组眼球区（t=4．159,P〈0．05）和骨膜外区（t=-4．306,P〈0．05）Blade技术信噪比明显高于常规技术;中度伪影组各眼眶分区内Blade技术信噪比与常规技术比较无统计学差异;重度伪影组眼球区（t=-4．917,P〈0．05）、视神经鞘区（Z=-4．687,P〈0．05）和骨膜外区（Z=-3．431,P〈0．05）Blade技术信噪比明显高于常规技术。结论Blade技术可提高眼眶扫描中图像的信噪比,且在同一伪影程度组中不同眼眶分区的信噪比差异有区别。     

肩胛骨骨折的手术治疗

目的探讨肩胛骨骨折手术入路的选择及分析临床应用效果。方法从1997年7月—2009年1月对31例肩胛骨骨折患者采用三种不同的手术入路进行内固定,对比其临床适应证,分析治疗效果。结果 31例患者全部得到随访,按照Constant的评定标准：优22例,良6例,可3例,优良率为90.3%。结论肩胛骨骨折通过手术治疗可获得良好的疗效,不同的骨折类型应采用不同手术入路,可获得更好的治疗效果。     

螺旋刀片交锁髓内钉治疗股骨粗隆下骨折

[目的]讨论螺旋刀片交锁的股骨重建髓内钉在股骨粗隆下骨折的治疗中的应用。[方法]对27例非病理性股骨粗隆下骨折患者按照Seinsheimer分类,其中Ⅰ型2例、Ⅱ型9例(ⅡA型5例、ⅡB型3例、ⅡC型1例)、Ⅲ型12例(ⅢA型7例、ⅢB型5例)、Ⅳ型3例、Ⅴ型1例,均采用AO/ASIF带螺旋刀片的股骨重建型髓内钉(UFN-SB)固定。[结果]所有27个病例随访9~42个月,平均15个月,术后可早期进行患肢功能锻炼及无负重下地活动,未出现交锁螺旋刀片断裂、退出或松动等并发症。[结论]螺旋刀片交锁的股骨重建型髓内钉治疗股骨粗隆下骨折,复位满意、固定牢靠、有利于骨折愈合、有效避免股骨缩短、旋转及髋内翻畸形,具有疗效好、创伤小、康复快、功能恢复满意等优点,特别是对于骨质疏松的中老年患者,这种新型交锁方式有效地减少了交锁钉周围的骨量丢失,增加了骨与内植物的接触界面,提供了更加理想的成角稳定性和旋转稳定性。     

发酵用离心式空压机节能选型的三个问题

以550Nm^3/min电力拖动定速离心式空压机的实例,介绍了：（1）流量调节方式的选型比较;（2）采用进气可调导叶调节流量的机组特性曲线的验证;（3）后冷却器成套条件参数的考虑给定和实际效果. 探讨流量允许负偏差和空压机轴功率允许正偏差的影响,指出国内外执行标准的差异,提出了解决方法.不能用压缩机配用电机功率,直接比较耗能水平.     

Unreamed femoral nail with spiral blade in subtrochanteric fractures: experience of 55 cases

OBJECTIVE: To evaluate the use of the unreamed femoral nail with spiral blade (UFN-SB) in the treatment of subtrochanteric femoral fractures. DESIGN: A retrospective review of a consecutive series of 55 fractures. Fourteen patients had metastatic disease (four had prophylactic nailing). RESULTS: In five fractures, the UFN-SB failed: there was migration in three cases and breakage of the spiral blade in two cases, with breakage of the nail in two cases. Revision surgery was necessary in four cases. Five out of seven complications related to the spiral blade were seen in patients with a Seinsheimer fracture Type IIC or V. All other fractures healed within 1 year including those that needed revision surgery. In two cases the end result was THR. CONCLUSIONS: No complication was observed in pathological fractures, which may be because of a high mortality in the first 4 months after surgery due to co morbidity. The main advantage of the nail seems to be its ease of use. It can be inserted through a small incision. The options in spiral blade angle insertion make it a very versatile implant. The implant should probably not be used in Type IIC or V (Seinsheimer) fractures.