Materials Literature
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The lens design problem for the 2002 IODC is to design a 100 mm focal length, f/8 all refractive system which simulates the chromatic behavior of a diffractive optical element. The lenses must be all spherical and be made of Schott glasses only. There is no restriction on the number of lenses, the design form, or the…
Abstract A review of the results obtained for the birefringence of different supermolecular structures of three polymorphic forms of polypropylene is presented. All known lamellar super-molecular formations of the monoclinic, hexagonal and triclinic phases are included. The observed morphology varies among negative he…
In nonwovens, fiber orientation is an important characteristic as it directly influences the properties of the material. Fiber orientation is an important structural characteristic. In modeling the performance of nonwovens, it is desirable to understand the impact of fiber orientation and anisotropy on performance. Wi…
Thin chalcogenide films of GexFex Se100-2x (x= 2.5,5,10 and 15 at.%) withthickness about ≈ 300 nm, have been prepared by thermal evaporationtechnique. A.C. conductivity σa.c. (ω) of the prepared thin films has beenmeasured in the frequency range (0.1-20 K Hz), over the temperaturerange(300-345 K).Obtained data reveal…
Abstract Stress‐whitening and its healing phenomena in polypropylene under tensile load superposed on hydrostatic pressure up to 89.7 MPa have been investigated. Tensile samples of polypropylene were first cold‐drawn beyond the yielding at atmospheric pressure to develop stress‐whitening, and the stress‐whitened sampl…
The derivation of a bond-order potential energy function and a self-consistent tight-binding scheme is presented, followed by a survey of the application of these methods to calculating properties of carbon nanostructures. The modeling studies discussed include properties of functionalized and kinked carbon nanotubes,…
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The physical and photophysical properties of three classic transition metal complexes, namely [Fe(bpy)3]2+, [Ru(bpy)3]2+, and [Co(bpy)3]2+, can be tuned by doping them into a variety of inert crystalline host lattices. The underlying guest-host interactions are discussed in terms of a chemical pressure.
The channel temperature of Gallium Arsenide (GaAs) devices was quantitatively measured using scanning thermal microscopy (SThM), which is a variation of atomic force microscopy (AFM). The temperature of the devices was also characterized by infrared (IR) imaging and thermal modeling. The measured SThM temperature valu…
The effect of winding speed on the properties of ring and compact yarns produced using the same mixing, preparatory process parameters and spinning parameters has been studied. Both wet and dry splicing techniques were used during winding to study the structure and properties of the spliced portions of the yarns. The…
Abstract [NMe4]2[Sn(C3S5)3], [NBun4]2[Sn(C3S5)3], [NBun4]2[Sn(C8H4S8)3], [NEt4][Sn(Bun)(C8H4S8)2] and [NBun4][Sn(Ph)(C8H4S8)2] [C3S52− = 4,5-disulfanyl-1,3-dithiole-2-thionate(2−) ; C8H4S82− = 2-{(4,5-ethylenedithio)-1,3-dithiole-2-ylidene}-1,3-dithiole-4,5-ditholate(2−)] were prepared by reactions of Na2[C3S5] or Na2…
The realisation of the so-called "cold dielectric" cable, where the insulation is kept at a cryogenic temperature, entails the choice of an optimised insulation system, with properties that are the best compromise between physical-electrical characteristics and design requirements. To this purpose, a specific study wa…
Abstract The physical properties of three montmorillonites before and after heating were studied by reflectance colorimetry, X-ray diffraction (XRD) and infrared (IR) and Mössbauer spectroscopies. Colorimetric data, though not directly relatable to sample mineralogy, provide cheap and rapid information on the temperat…
The XPS spectra of magnesium phosphate were collected on a VSW HA150 using monochromatic Al Kα x-radiation. The valence band region shows the characteristic features of the orthophosphate ion and is in good agreement with previous data in the literature. The reported regions are as follows: survey, O 1s, C 1s, P 2s, P…
Abstract Silicon dioxide (SiO 2 ) thick films have been deposited by plasma enhanced chemical vapor deposition (PECVD) and flame hydrolysis deposition (FHD). PECVD SiO 2 films were obtained at low temperatures (<350 °C) by the decomposition of the appropriate mixture of (SiH 4 +N 2 O) gases under suitable rf power…
An analysis of the microstructure of nanocrystalline yttrium oxide produced by thermal decomposition of a double oxalate yttrium and ammonium, at temperatures in the range 600 °C to 900 °C, is described. The study is based on line broadening analysis carried out with the (Voigt/Langford) integral breadth and Fourier m…
The martensite transformation and work hardening of metastable austenite induced by abrasive wear in an austenitic Fe-C-Cr-Mn-B alloy were studied by TEM. The results show that an α' martensitic transformation occurred to form an elongated and equiaxial cellular dislocation substructure and the untransformed austenite…
After the hot rolling process the steel strip remains covered with an oxide layer (scale) which must be removed previous to the cold rolling process. The scale removal through the pickling process by hydrochloric acid (HCl) depends on both the scale structure and the conditions of the pickling bath (temperature, acid…
Abstract The thermal decomposition of chlorinated poly(vinyl chloride) and three plasticized chlorinated poly(vinyl chloride) systems has been investigated. The routes of decomposition of these systems have been elucidated by investigating char formation and by using a combination of thermogravimetric analysis (TGA) a…
The intent of this paper is to predict the effects of random edge roughness on the knife-edge diffraction of an incident wave. This has been accomplished by approximating the field beyond the diffracting half plane with spectral techniques and the Kirchhoff approximation. By restricting the point of observation of the…