钢筋混凝土“烟囱群”的定向爆破拆除

介绍了5座烟囱组成"烟囱群"的爆破拆除不同于单一烟囱爆破的设计特点。特别是针对影响各烟囱倒向的不同条件进行爆破切口调整预处理后,使烟囱群爆破倾倒趋于同向的一些施工方法以及爆破效果。     

铜陵110m高烟囱和120m高烟囱爆破拆除

介绍了采用定向控制爆破技术拆除铜陵有色一冶厂110m高环保烟囱和120 m熔炼烟囱的成功实例.给出爆破方案的设计、爆破参数的选取、方向控制预处理情况、防护措施及爆破效果,为今后此类烟囱的爆破拆除提供了参考依据.     

100m钢筋砼烟囱和80m砖烟囱定向爆破拆除

10 0m钢筋砼烟囱和 80m砖烟囱位于南北向的一直线上 ,相距 42m。由于周围环境条件的限制 ,朝南方向是唯一可供两个烟囱倒塌的方向。因此 ,砖烟囱必须先爆破 ,以便为钢筋砼烟囱的倒塌提供必要的场地。文中论述了爆破切口的设计、爆破参数的确定、预处理以及减震和防护措施等 ;同时提出了一些有益的经验 ,可供类似工程参考。     

120m超高塔架式钢结构烟囱定向爆破拆除

介绍了一座120m高钢结构烟囱的定向爆破拆除工程。通过对烟囱自身结构特点及周围环境的分析,合理的选择爆破切口、爆破参数、延时起爆网路及安全防护等技术措施。为了确保起爆后烟囱沿设计方向顺利倒塌,预先对爆破部位钢板进行机械切割预处理,并针对各爆破部位钢板形状设计出相配合尺寸的聚能切割器。爆破拆除的钢结构烟囱倒塌在设计范围内,四周建(构)筑物和设施完好无损。该烟囱的爆破拆除在安全和质量上都达到了预期效果,可为类似爆破工程提供经验。     

120m超高塔架式钢结构烟囱定向爆破拆除

介绍了一座120m高钢结构烟囱的定向爆破拆除工程。通过对烟囱自身结构特点及周围环境的分析,合理的选择爆破切口、爆破参数、延时起爆网路及安全防护等技术措施。为了确保起爆后烟囱沿设计方向顺利倒塌,预先对爆破部位钢板进行机械切割预处理,并针对各爆破部位钢板形状设计出相配合尺寸的聚能切割器。爆破拆除的钢结构烟囱倒塌在设计范围内,四周建(构)筑物和设施完好无损。该烟囱的爆破拆除在安全和质量上都达到了预期效果,可为类似爆破工程提供经验。     

55m砖烟囱小角度切口爆破拆除

为了成功爆破拆除一座55m高的砖结构烟囱,根据周围环境、烟囱高度及其结构特点,选取了合适的爆破倾倒方向和合理的爆破参数,采用了精准的爆破起爆网路。在实际工程中,砖烟囱爆破切口圆心角多数在200°~220°,通过对烟囱倾倒需满足的条件进行计算,确定其满足条件的爆破圆心角范围。设计了小角度爆破切口,其对应圆心角为185°,并且在爆破前进行预处理。起爆后,烟囱按照设计方向顺利倾倒,取得了较好的爆破效果。振动监测结果均在安全允许范围内,验证了砖烟囱小角度切口爆破拆除的可行性,可为类似工程提供参考。     

55m砖烟囱小角度切口爆破拆除

为了成功爆破拆除一座55m高的砖结构烟囱,根据周围环境、烟囱高度及其结构特点,选取了合适的爆破倾倒方向和合理的爆破参数,采用了精准的爆破起爆网路。在实际工程中,砖烟囱爆破切口圆心角多数在200°²20°,通过对烟囱倾倒需满足的条件进行计算,确定其满足条件的爆破圆心角范围。设计了小角度爆破切口,其对应圆心角为185°,并且在爆破前进行预处理。起爆后,烟囱按照设计方向顺利倾倒,取得了较好的爆破效果。振动监测结果均在安全允许范围内,验证了砖烟囱小角度切口爆破拆除的可行性,可为类似工程提供参考。     

电厂发电机组厂房及高150m烟囱定向爆破拆除

介绍了复杂环境下电厂发电机组厂房及高150m烟囱定向爆破拆除.通过预处理发电机组厂房爆破切口、割断立柱部分钢筋、保留后排立柱墙体作为烟囱爆破触地防冲墙,以及对烟囱爆破切口有针对性地抬高,割断烟囱支撑中心部位钢筋等措施,取得了良好的爆破效果.     

40m青砖烟囱定向控制爆破拆除技术

介绍了复杂环境条件下采用定向控制爆破技术拆除一座40 m高青砖混凝土结构烟囱的工程实例。烟囱的结构特点及周围密集的建筑物,使得对烟囱倒塌方向的精准度要求极高。通过计算分析,选择了合理的爆破技术方案,选用三角形定向窗保证倒塌的准确性,确定了合适的爆破参数;同时,对爆破前的预处理及爆破时的防护措施进行了完善。最终,烟囱爆破拆除圆满成功,并取得了良好的爆破效果。可为类似工程案例提供参考。     

210m钢筋混凝土烟囱定向爆破拆除

介绍了一座高210m的钢筋混凝土烟囱的定向爆破拆除。文中介绍了该烟囱爆破切口的选择、爆破参数的选取、延时起爆网路、预处理及安全防护等控制烟囱准确倒向的技术措施;探讨了该烟囱定向拆除爆破的可行性。爆后现场倒塌的烟囱顶端偏离倒塌方向中心线仅1.5m,高210m钢筋混凝土烟囱定向控制爆破取得圆满成功。     

Characterization of nanocrystalline Ni–Cu thin films electrodeposited onto ITO coated glass substrates: effect of pretreatment current density

In this work, Ni–Cu films were grown onto indium tin oxide coated glass substrates without and with galvanostatic pretreatment process at different current densities. In all cases, Ni–Cu films were electrodeposited at a constant deposition potential of ?1,800 mV versus saturated calomel electrode. After that, the surface morphology and structural properties of electrodeposited Ni–Cu films in dependence of pretreatment current density were studied. X-ray diffraction analysis showed that all films have face-centered cubic structure and consist of segregated two Ni-rich and Cu-rich phases regardless of pretreatment current density. The compositional analysis carried out by energy dispersive X-ray spectroscopy revealed that all films contain almost 90 wt% Ni and 10 wt% Cu. The average crystallite size decreased with decreasing pretreatment current density towards more negative values without inducing significant changes in the composition of the films. It was found that the preferred orientation of all films is in the [111] direction regardless of pretreatment current density. The effect of galvanostatic pretreatment process on the surface morphology investigated using a scanning electron microscopy and an atomic force microcopy were also discussed by means of obtained results.     

Influence of Bile Salts on the Permeability Through the Nasal Mucosa of Rabbits of Insulin in Comparison with Dextran Derivatives

The nasal drug absorption and the effect of absorption promoters have been studied in rabbits. Nasal mucosa excised from rabbits was mounted as a flat sheet in an in vitro chamber. The result indicates that the change in the porosity of the membrane by pretreatment with bile salts increased the permeability coefficient of sodium chloride in the nasal membrane. The permeabilities of dextran derivatives were enhanced by pretreatment with sodium glycocholate (GC). The permeability coefficient (P) of fluorescein isothiocyanate diethylaminoethyl dextran     

砖混结构物爆破拆除预处理优化设计中主要影响因素的研究

主要研究砖混结构建筑物爆破拆除预处理过程中 ,在保证获得最大爆破效益的前提下 ,对高厚比、结构空间效应、风荷载以及机械振动和冲击效应等几个与结构物稳定性有着重要关系的主要因素进行了探讨 ,其研究成果对更全面深入地研究砖混结构建筑物爆破拆除预处理理论与技术 ,有一定的参考价值     

硅橡胶表面壳聚糖载铜凝胶涂层的制备及其抗菌功能

在硅橡胶表面制备一种具有抗感染功能的涂层—壳聚糖载铜凝胶涂层。为了克服硅橡胶的生物惰性,在其表面制备涂层,先用逐步化学接枝法对其表面进行活化预处理,然后化学接枝壳聚糖载铜凝胶涂层。对比浸泡前后涂层的形貌,研究了活化预处理对功能化涂层与硅橡胶基体之间结合性能的影响。结果表明,用化学接枝法可在硅橡胶表面生成丰富的活性官能团从而提高了功能化涂层与硅橡胶的结合强度。载铜功能化涂层使硅橡胶导管具有良好的抗菌功能。     

Vorbehandlung polymerer Klebflächen im Niederdruckplasma

Pretreatment of polymer glue surfaces by Ip-plasma Low-pressure-plasma-technique represents a modern and high effective method for cleaning and systematical modification of polymer surfaces but also allows the protection of environment. With lp-plasma-technology excellent and reproducible surfacequalities can be produced, without changing any mechanical attribute. A lot of internal process parameters (time, energy, pressure, mixture of process gas) assure the process controlling (plasma), but also many external parameters (material, loading degree, time between pretreatment and application of bonding material, processing-steps before and behind the plasmatreatment) have great influence to the result of the pretreatment. The effect of all these internal and external parameters to the result of pretreatment and the quality of adhesive strength will be discuss by the two polymers PP and PBT.     

Effect of morphology of catalyst thin film on carbon nanotube growth

The Ni catalyst films were deposited on single crystal Si by magnetron sputtering system. The surface morphologies of the films were controlled by varying the pretreatment temperature in NH₃. We have investigated how the morphology of Ni after thermal treatment influences on the vertically aligned carbon nanotubes growth during thermal chemical vapor deposition. We found that the pretreatment temperature determined the grain size and density of the Ni catalyst that controlled the diameter, length, and density of carbon nanotubes. The degree of crystallization and order of the CNTs as a function of pretreatment temperature was further discussed by Raman spectrums. We found that more aligned and ordered samples correspond to lower I _D/I _G ratios.     

高耸圆筒形建筑物定向爆破拆除的预处理

针对水塔、烟囱、储料罐等高耸圆筒形建筑物的定向爆破拆除,阐述了预处理的意义、原则和方法,通过爆破工程实践得出的经验对预处理技术问题做一小结,供参考.     

The effect of thermal history on the color of oxide layers in titanium 6242 alloy

A study was done to examine the effects of thermal history and surface pretreatment on the color of oxide layers in Titanium 6242 alloy. Coupons of the alloy underwent three different pretreatment options prior to thermal exposure to temperatures from 371 to 760 °C with periods from 6 min up to 100 h. After exposure it was found that there was not a simple correlation between color and thermal history. Also, it was not evident after exposure that the hardness could be traced to the thermal history. However, it was clear that color did rely on pretreatment options. The abrasive treatment resulted in shades of gold with a polished look while the milder treatments produced matte hues of blue. All coupons after exposure were found to have an oxide layer thickness of no more than 400 nm.     

预环化处理方式对腈纶预氧化纤维性能的影响

研究了预环化处理方式对预氧化纤维阻燃性能和力学性能的影响。实验结果表明,先用羟胺处理,再用水合肼处理,所得预氧化纤维的阻燃性能和力学性能相对较好,在预氧化温度260℃时,可得到极限氧指数36.5%的预氧化阻燃纤维。扫描电镜观察表明,表面处理后纤维外表面裂纹明显减少,预氧化处理后纤维裂纹有所恢复。红外光谱分析表明,表面处理后纤维有少量吡啶环状结构生成,而预氧化后纤维中有大量吡啶环化结构产生。X射线衍射分析显示,经表面处理和预氧化之后纤维的形态结构没有发生大的变化,仍为高有序区和非晶区组成的准晶有序结构。     

Influence of Bile Salts on the Permeability Through the Nasal Mucosa of Rabbits of Insulin in Comparison with Dextran Derivatives

Abstract

The nasal drug absorption and the effect of absorption promoters have been studied in rabbits. Nasal mucosa excised from rabbits was mounted as a flat sheet in an in vitro chamber. The result indicates that the change in the porosity of the membrane by pretreatment with bile salts increased the permeability coefficient of sodium chloride in the nasal membrane. The permeabilities of dextran derivatives were enhanced by pretreatment with sodium glycocholate (GC). The permeability coefficient (P) of fluorescein isothiocyanate diethylaminoethyl dextran