双环切技术治疗重度环状混合痔临床疗效

目的探讨双环切技术治疗重度环状混合痔的临床效果。方法单纯采用外痔环切+吻合器痔上黏膜环节钉合术治疗重度环状混合痔。结果各病例术后均可达到临床治愈,肛缘平整,肛门功能完好。结论双环状手术治疗重度环状混合痔取得较好的临床效果。

双环切术治疗重度混合痔的临床疗效

为探讨双环切术治疗重度混合痔的临床疗效，回顾我科采用双环切术治疗的31例重度混合痔（观察组）患者资料，并与采用改良Milligan—Morgan术治疗的33例重度混合痔（对照组）患者进行比较。结果显示，两组患者均治愈。观察组术后肛周疼痛、肛缘水肿、尿潴留、创面愈合时间均明显优于对照组，P〈0．05。观察组创口全部一期愈合，对照组3例创1：I未能一期愈合。观察组术后1个月发生吻合口狭窄1例，扩肛后缓解。术后6个月随访，两组均无肛门狭窄、肛门失禁等严重后遗症发生。结果表明，双环切术治疗重度混合痔疗效确切，术后并发症轻，创面愈合快，是一种较为理想的术式，但术后有发生吻合口狭窄的可能，应注意扩肛。

恒定平稳的多用途切片机

需要切片的加工食品,其形状和大小是否均匀一致,与最终成品的质量有着密切的关系。为配合日渐提升的切片要求,Urschel CC型切片机现可配备新型专利的双环切头,能大大提高切片的精确度。 双环切头的特点在于上、下两端能调节的支承环。下环能确保切头坚固稳定,因此,新更换的刀片仍能保持原先设定的间隙或切片厚度。这种双重支承环,与位于其上的调节螺杆相结合。

新建铁路蒙西至华中地区铁路煤运通道工程MHTJ-1标桥梁部分施工总结

蒙华铁路MHTJ-1标段三工区共3座简支梁桥,桩基为摩擦桩基础,采用反循环钻成孔,桩头凿除使用双环切法,混凝土养护采用塑料布包裹滴灌法进行养护,结构物内外质量要求高,工点分散,环水保要求严格,现场较难管理.

Performance of interface between TRC and existing concrete under a chloride dry-wet cycle environment

Textile-reinforced concrete(TRC)is suitable to repair and reinforce concrete structures in harsh environments.The performance of the interface between TRC and existing concrete is an important factor in determining the strengthening effect of TRC.In this paper,a double-sided shear test was performed to investigate the effects of the chloride dry-wet cycles on the average shear strength and slip at the interface between the TRC and existing concrete,also considering the existing concrete strength,bond length,textile layer and short-cut fiber arrangements.In addition,X-ray diffraction(XRD)technology was used to analyze the microscopic matter at the interface in the corrosive environment.The experimental results indicate that the interface performance between TRC and existing concrete would decrease with continued chloride dry-wet cycles.Compared with the specimen with a single layer of textile reinforcement,the specimens with two layers of textile with added PVA or AR-glass short-cut fibers could further improve the properties of the interface between the TRC layer and existing concrete.For the TRC with a single layer of textile,the average shear strength tended to decrease with increasing bond length.In addition,the strength grade of the existing concrete had a minor effect on the interface properties.

A switchable and tunable ytterbium-doped fiber ring laser with a Sagnac loop mirror

A switchable and tunable ytterbium-doped fiber ring laser(YDFL) is reported and demonstrated. Employing a Sagnac loop mirror fabricated by an 85-cm-long polarization-maintaining fiber(PMF), the proposed YDFL can operate with stable dual-wavelength lasing or tunable single-wavelength lasing around 1 064 nm. Both stable dual-wavelength lasing and tunable single-wavelength lasing are achieved by adjusting a polarization controller in the Sagnac loop mirror. The experimental results show that the output of the proposed fiber laser with two different operation modes is rather stable at room temperature.