Optical Spectroscopic Analysis of the Quality of the Solvent Used for Gel-Spinning of Ultra-High-Molecular-Weight Polyethylene

Fibre Chemistry - An optical spectroscopic method for analyzing the quality of the solvent used for gel-spinning of ultra-high-molecular-weight polyethylene was proposed using Vaseline oil (VO) as...     

Kinetics of the process of electroslag surfacing and the tructure of deposited metal based on nickel aluminide

The course of overlay welding technology qualification using welding procedure test according to the PN-EN ISO 15614-7 specifications is described. How the preliminary welding procedure specification (pWPS) should be prepared is clarified and the type of test pieces as well as the type of tests that should be carried out after overlay welding are presented. The criteria to be met by test pieces so that the welding procedure may be qualified as acceptable are discussed. The qualification range and the details of the welding procedure qualification record (WPQR) also presented. Numerous examples of overlay welding procedure qualification tests, carried out at the Welding Institute are described.     

Synthesizing the components of photopolymerizing acryl composites for production of waveguides with high transparency within telecommunication spectral regions

Methods for synthesizing hydrocarbon and fluorine-containing monomers and oligomers for the creation of planar polymer waveguides were developed. Over 20 mono- and bifunctional methacrylates of hydrocarbon and fluorinated alcohols, glycols, and diols were synthesized and characterized, and their physicochemical and spectral properties were studied. Polymers with low absorption in telecommunication spectral regions, i.e., near 800 and 1500 nm, and a wide refraction index range of 1.34?C1.557 were obtained by the method of photopolymerization. The developed oligomers were used to produce planar waveguides.     

Approximation of elastic deformations on the surface of a silicon piezoresistive pressure transducer with three-dimensional E-type micromechanical structure

Approximation expressions for use in calculating tangential deformations on the surface of an E-type silicon piezoresistive membrane pressure transducer with three-dimensional micromechanical structure under actual operating conditions of a permanent joint and restraint by means of a supporting element are obtained. Translated from Izmeritel’naya Tekhnika, No. 3, pp. 36–39, March, 2009.     

Parkerizing steel with preliminary surface activation

Attention focuses on how certain activators affect the parkerizing process and the properties of the phosphate films obtained. Comparative corrosion-endurance tests of the films obtained are conducted. The effectiveness of such activators in production conditions is established.     

Influence of steel substrate roughness on morphology and mesostructure of TiO2 porous layers produced by template-assisted dip coating

Mesoporous titania films were prepared by template-assisted dip coating on 1.4301 stainless-steel substrates processed by grinding and spark erosion to different degrees of roughness. The influence of substrate roughness on the morphology and mesostructure of deposited films was studied. Textures produced by grinding with roughness R_a ranging from 0.10 to 0.78 μm did not noticeably affect the pore structure as confirmed by similar pore size and a single cubic mesophase formed on grinded steel. Grinding had a modest effect on the film integrity which manifested in fractures developed in the texture depressions. Greater roughness of the steel produced by spark erosion affected the micelle self-assembly process yielding two different mesophases on a substrate of 1.08 μm roughness, and resulting in a predominant loss of templated mesostructure on a rougher (R_a = 2.69 μm) substrate surface. Film surface area expressed as m² BET per m² of the substrate planar dimensions increased with substrate roughness. Higher roughness resulted in higher photocatalytic activity of crystalline films when tested in methylene blue decomposition. Given that a moderate surface texture had a negligible effect on the film mesostructure, introducing controlled substrate roughness may serve as a technique to enhance the total film surface area.