新生儿肺泡表面活性物质经三通侧孔注入给药可行性分析

目的研究新生儿肺泡表面活性物质的最佳给药方式。方法将96例呼吸窘迫综合征新生儿,采用肺泡表面活性物质进行治疗,随机分为观察组和对照组,各48例。观察组患儿使用三通连接气管插管与复苏气囊,经三通侧孔注入全部药液。对照组使用注射器连接,同时去掉针头的头皮针软管,把软管插到气管插管头端,分多次注入药物后抽出软管,再使用复苏气囊,将气管插管实施正压通气l^2 min后,经过多次滴注全部药液。结果观察组Sp O2在用药前后差异无统计学意义。操作时间和药物反流:观察组和对照组比较,差异有统计学意义(P<0.05)。结论采用三通连接气管插管以及复苏气囊的方法,经过三通侧孔滴注到注入肺表面活性物质给药不良反应比较少,并且减少了药物浪费,操作方法简单,值得大范围推广。

空间孔位尺寸的简易检具设计制造及应用

一种具有空间角度和孔径尺寸的斜孔三通制件,采用万能工具显微镜测量虽能够定量测量出该制件的所有尺寸。但由于检测时间过长,效率很低,还会造成精测设备的损耗和占用,以及检测工序的积压所形成的周期瓶颈。为此,设计和制造了一种综合性快速简易检具。检测内容包容了斜孔三通的角度和孔径公差,从而实现了该制件的快速检测,解决了设备损耗和占用以及检测工序周期的瓶颈问题。

Preparation of three-dimensional interconnected mesoporous anatase TiO_2-SiO_2 nanocomposites with high photocatalytic activities

In this article, we report the preparation of a three-dimensional（3D） interconnected mesoporous anatase TiO2-SiO2 nanocomposite. The nanocomposite was obtained by using an ordered two-dimensional（2D） hexagonal mesoporous anatase 70 TiO2-30 SiO2-950 nanocomposite（crystallized at 950 °C for 2 h） as a precursor, NaO H as an etchant of SiO2 via a ＂creating mesopores in the pore walls＂ approach. Our strategy adopts mild conditions of creating pores such as diluted NaO H solution, appropriate temperature and solid/liquid ratio, etc. aiming at ensuring the integrities of mesopores architecture and anatase nanocrystals. XRD, TEM and N2 sorption techniques have been used to systematically investigate the physico-chemical properties of the nanocomposites. The results show that the intrawall mesopores are highly dense and uniform（average pore size 3.6 nm）, and highly link the initial mesochannels in a 3D manner while retaining mesostructural integrity. There is no significant change to either crystallinity or size of the anatase nanocrystals before and after creating the intrawall mesopores. The photocatalytic degradation rates of rhodamine B（RhB, 0.303 min^–1） and methylene blue（MB, 0.757 min^–1） dyes on the resultant nanocomposite are very high, which are 5.1 and 5.3 times that of the precursor; even up to 16.5 and 24.1 times that of Degussa P25 photocatalyst, respectively. These results clearly demonstrate that the 3D interconnected mesopores structure plays an overwhelming role to the increments of activities. The 3D mesoporous anatase TiO2-SiO2 nanocomposite exhibits unexpected-high degradation activities to RhB and MB in the mesoporous metal oxide-based materials reported so far. Additionally, the nanocomposite is considerably stable and reusable. We believe that this method would pave the way for the preparation of other 3D highly interconnected mesoporous metal oxide-based materials with ultra-high performance.

香烟滤嘴棒圆周动态精确控制的设计

介绍了基于PLC应用技术的PID智能控制在香烟滤嘴棒生产过程中的应用,对滤嘴棒圆周实施动态、高速、准确的控制与设计进行了阐述。

API、SHELL和GB标准对管道带压开孔三通试压要求的比较

本文对API标准、SHELL标准和GB中的相关条款进行了比较和分析,归纳总结,吸取先进做法,指出了标准中的不足及在试压施工中需要注意的问题。

高钢级大口径油气管道在役自动焊工艺

随着长输油气管道建设朝高压力、大口径、高钢级、大壁厚方向发展,油气管道在役焊接涉及的开孔三通、修复套筒等管件的壁厚也随之增大,采用手工电弧焊进行油气管道维修焊接效率低,且焊接质量难以保证,因此亟需实现油气管道在役焊接的机械化施工。从焊接工艺的选择、焊接试验过程、焊接材料选择、保护气体的影响以及焊接工艺评定试验等方面,开展了油气管道在役焊接自动焊工艺研究。通过自动焊技术在中国高钢级、大口径天然气管道B型套筒在役焊接中的现场工程应用,论证了在役焊接自动焊工艺的可行性。最后,提出了在役油气管道自动焊技术推广的建议。