Materials Literature
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Ordered organo–silica–surfactant mesophases containing covalently linked functionalized moieties are prepared with MCM-41-type architectures by template-directed co-condensation of tetraethoxysilane and organotrialkoxysilanes (RO) 3 Si–R′ [R = Me, Et; R′ = (CH 2 ) 3 SH, (CH 2 ) 3 NH 2 , (CH 2 ) 3 OCH 2 CH(O)CH 2 , (CH…
XAFS, IR, and UV−vis (diffuse reflectance and photoluminescence) spectroscopies have been employed to investigate the local environment of Cu I in Cu I -ZSM-5 prepared by gas phase reaction of H-ZSM-5 (SiO 2 /Al 2 O 3 = 90−50) with CuCl. The measurements confirm that the absolutely predominant copper species formed wi…
False-twist-textured yarns of 22 dtex and below with few filaments are commonly used in stretch stockings and tights. Because of the relatively high ratio of filament diameter to yarn diameter in such yarns, a concentric-helix model cannot be assumed, and the geometrical relationships describing their structure have t…
Sudden rearrangement of the tightly packed bubbles in a foam can be induced by application of shear and by diffusion of gas from smaller to larger bubbles. Using diffusing-wave spectroscopy, we measure dynamics at times that are short in comparison with the rate of these events, where the relative bubble configuration…
Electrochromic properties of poly(aniline N‐butylsulfonate)s (PANBUS) coatings on indium‐tin oxide (ITO) glasses exposed to an ion conducting polymer films were investigated. The ion conducting polymer films were prepared via photocross‐linking reactions of methoxy polyethylene glycol‐mono methacrylate with tri(propyl…
The solution of the nonlinear equation for a typical ferroresonant circuit containing a power transformer is shown to be dependent on the value of its initial conditions. It is also shown that a small change in initial conditions leads to a large difference in long-term behaviour of the system, and this makes the futu…
Fabrics woven from ring-, rotor-, and friction-spun yarns, have been compared from the standpoint of comfort. Emphasis has been placed on the tactile and thermal aspects of comfort by the use of the Kawabata Fabric Evaluation System. The effect of the weave on the comfort aspects of the fabric has also been studied. A…
The effect of tramp elements Cu and Sn on the hot workability of mild steels was investigated in this paper. A hot rolling condition was simulated by oxidizing followed by tensile-deforming and the hot workability was assessed by measuring the number of surface cracks. The microstructure at the scale/steel interface w…
Low-grade exhaust heat is used to provide a reliable and independent power source for instrumentation circuitry by means of a thermoelectric generator (TEG). A design of a self-starting DC-DC power converter is developed and optimized for very-low-input voltages (below 300 mV) in order to allow operation at temperatur…
Abstract β‐crystalline phase polypropylene (PP) composites containing 5, 10, 20, 30, and 40% (by weight) of CaCO 3 filler were prepared by injection molding. The β‐form PP was produced by adding a bicomponent β‐nucleator consisting of equal amounts of pimelic acid and calcium stearate. The morphology, static tensile,…
X-Ray photoelectron spectroscopy (known as XPS or ESCA) can differentiate between tetrahedral and octahedral Al atoms in inorganic solids. Although primarily used for the study of aluminosilicates, this semi-quantitative technique is applicable to other materials, irrespective of whether they contain aluminium in one…
A computational technique is described and demonstrated that can decrease by three orders of magnitude the computer time required to treat detailed chemistry in reactive flow calculations. The method is based on the in situ adaptive tabulation (ISAT) of the accessed region of the composition space - the adaptation bei…
The bacterial cellulose produced in an agitated culture (Ag-BC) showed the highest emulsion-stabilizing effect among the examined cellulosk materials. It was clarified that a mechanical barrier and a scaffolding structure composed of fine fibrils of bacterial cellulose interrupted the coalescence of oil droplets to st…
In this paper a dynamic model of the human/ clothing/environment-system is developed. The human body (controlled system) is subdivided into six segments consisting of the head, trunk, arms, hands, legs and feet. Each segment is further divided into the core, muscle, fat, and skin layer. The afferent signal of the cont…
Direct exchange interactions between divalent chromium ions in naked dimers, tetramers, and clusters were investigated theoretically. The orbital energy gaps, occupation numbers, and bond orders for the naked Cr(II)−Cr(II) dimer ( 1 ) were calculated by ab initio UHF MO and density functional (DFT) methods. All these…
Alumina-supported manganese oxides, used as catalysts for the selective catalytic reduction of NO, were characterized by combined electron spin resonance and diffuse reflectance spectroscopies. Upon impregnation of the acetate precursor solution, the [Mn(H 2 O) 6 ] 2+ complex interacts strongly with surface hydroxyls…
As to an oxide dispersion strengthened (ODs) ferritic steel cladding as the promising candidate for long-life core materials of the fast reactors, previously fabricated claddings had inferior internal creep rupture strength in hoop direction and inferior formability due to less ductility. Those unexpected features of…
Argon plasma treatment followed by exposure to atmospheric oxygen has been used to introduce new carbon–oxygen functionalities to polymer surfaces. We report on the treatment of poly(styrene) (PS), low density poly(ethylene) (LDPE), poly(propylene) (PP) and poly(ethylene terephthalate) (PET). Argon plasma-treated poly…
Recent progress concerning lattice dynamics in quasicrystals, both theoretical and experimental, is discussed. The theory deals with the general description, which differs from that for ordinary crystals, and with model calculations and rigorous results for one-, two-, and three-dimensional systems. Experimental resul…
This paper deals with mathematical models of magnetic hysteresis implemented by assembling hysterons of play and stop type. A procedure for the identification of these models is described, and their behaviors are compared to experimental results. A comparison to the Preisach and Prandtl-Ishlinskii models is performed.…