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MIXING BEHAVIOUR OF THE WELD POOL DURING GTA WELDING OF ALUMINIUM-MATRIX COMPOSITES
Electronic and nuclear contributions to the third-order nonlinear optical susceptibilities of new p-N, N^?-dimethylaniline tetrathiafulvalene derivatives
We report large third-order nonlinear optical susceptibilities (?3?)(ijkl) of new tetrathiafulvalene derivatives, using the degenerate four-wave mixing (DFWM) method. To understand the physical nature of the optical nonlinearities, we separate their electronic and nuclear contributions. The electronic contribution to…
Nanosieves with microsystem technology for microfiltration applications
A nanosieve with a very uniform pore size of 260 nm and a pore-to-pore spacing of 510 nm has been fabricated using multiple exposure interference lithography and (silicon) micromachining technology. The nanosieve filter consists of a thick silicon nitride membrane perforated with submicron diameter pores and a macrope…
Influence of line dimensions on the resistance of Cu interconnections
As dimensions reach the deep-submicrometer level on the order of the mean-free path of electrons, increases in the resistivity of a metal corresponding to reductions of wire dimensions is a concern. To understand the resistance dependence on the dimensions, resistance of Cu versus interconnection size was analyzed. Th…
Description of Diffraction Grating Behavior in Direction Cosine Space
It is well known that the angular separation of non-paraxial diffracted orders from a linear grating varies drastically with incident angle. Furthermore, for oblique incident angles (conical diffraction), it is rather cumbersome both analytically and graphically to describe the number and angular position of the vario…
Decay and durability of building stones in urban environments
This paper studies the effect of some pollutant agents in urban environments -gaseous SO2, acid rain and solid particles- on carbonate and siliceous building stones with different petrophysic characteristics. The selected environments have been London, Garston (UK) and Burgos (Spain) and the exposed materials have bee…
Mechanical characterization of sawn timber for structural use, graded visually in accordance with Spanish standard UNE 56544
The employment of timber in structures in Spain was hurting of the nonexistence of accepted calculation procedures. The recent adoption and publication of the Eurocode 5 compels to the employment of the characteristic values of the material in the structural calculation by the method of the finite elements. This repor…
Polarons in Wurtzite Nitride Semiconductors
Polaron binding energy and effective mass are calculated for semiconductors with wurtzite crystalline structure from the first order electron-phonon corrections to the self-energy. A recently introduced Frohlich-like electron-phonon interaction Hamiltonian which accounts for the LO and TO polarizations mixing due to t…
Axial Divergence in a Conventional X-ray Powder Diffractometer. II. Realization and Evaluation in a Fundamental-Parameter Profile Fitting Procedure
An accurate model for the axial divergence aberration function has been implemented within a fundamental-parameters fitting procedure for diffraction profiles from a conventional X-ray powder diffractometer. The aberration function for axial divergence is derived from the geometrical dimensions of the diffractometer i…
Electrochemical Determination of the Porosity of Single and Duplex PVD Coatings of Titanium and Titanium Nitride on Brass
For the development of optimized coating‐substrate systems one needs fast and reliable methods which permit the characterization of both intrinsic corrosion resistance and porosity. In the present paper electrochemical procedures for the determination of porosity are developed and applied to the study of Ti and TiN co…
Rheological and mechanical properties in polyethylene blends
Abstract Melt rheology and mechanical properties in linear low density polyethylene (LLDPE)/low density polyethylene (LDPE), LLDPE/high density polyethylene (HDPE), and HDPE/LDPE blends were investigated. All three blends were miscible in the melt, but the LLDPE/LDPE and HDPE/LDPE blends exibiled two crystallization a…
Synthesis, Characterization and Magnetic Susceptibility of the Heavy Fermion Transition Metal Oxide LiV_{2}O_{4}
The preparative method, characterization and magnetic susceptibility χmeasurements versus temperature T of the heavy fermion transition metal oxide LiV_{2}O_{4} are reported in detail. The intrinsic χ(T) shows a nearly T-independent behavior below ~ 30 K with a shallow broad maximum at about 16 K, whereas Curie-Weiss-…
Thermal expansion of solids
This book gives an in-depth look at the theory of thermal expansion of solids and the techniques for measuring this property. The individual chapters are written by 13 recognized experts on all aspects of the subject who collectively represent almost 500 years of professional activity. While the data presented in the…
Ductile Iron: Fifty Years of Continuous Development
The discovery of Ductile Iron in 1948 gave a new lease on life to the cast iron family. By combining the castability of gray iron and the toughness of steel, Ductile Iron compelled a wide recognition as an economical choice for high performance complex ferrous parts. Fifty years of research and development J.t have le…
Generalized hydrodynamic equations for nematic liquid crystals
We present a formulation of the nematic liquid crystal hydrodynamics based on the tensor order parameter, with the spatial variations of both the director and the scalar (uniaxial and biaxial) order parameters explicitly taken into account. New length and time scales are shown to arise that can be important for the sw…
Physical origin of the buckling in CuO$_2$: Electron-phonon coupling and Raman spectra
It is shown theoretically that the buckling of the CuO$_{2}$ planes in certain cuprate systems can be explained in terms of an electric field across the planes which originates from different valences of atoms above and below the plane. This field results also in a strong coupling of the Raman-active out-of-phase vibr…
Ordered stack of spin valves in a layered magnetoresistive perovskite
The layered compound ${\mathrm{La}}_{2\ensuremath{-}2x}{\mathrm{Sr}}_{1+2x}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ $(x=0.3)$ consists of bilayers of metallic ${\mathrm{MnO}}_{2}$ sheets separated by insulating material. The compound exhibits markedly anisotropic magnetoresistance at temperatures well below the three-dimens…
X-ray photoelectron spectroscopic study of a pristine millerite (NiS) surface and the effect of air and water oxidation
Other| December 01, 1998 X-ray photoelectron spectroscopic study of a pristine millerite (NiS) surface and the effect of air and water oxidation Daniel L. Legrand; Daniel L. Legrand INCO, Central Process Technology, Copper Cliff, ON, Canada Search for other works by this author on: GSW Google Scholar H. Wayne Nesbitt;…
Axial Divergence in a Conventional X-ray Powder Diffractometer. I. Theoretical Foundations
A general model for the axial divergence aberration function has been developed for a conventional X-ray powder diffractometer equipped with either incident-beam and/or diffracted-beam Soller slits. In this model, the axial divergence function is generated from the geometrical dimensions of the diffractometer system,…