Hyperfine structures of the rotation-inversion transitions with J = 3 <-- 2, s <-- a, and K = 0, 1, 2, and with J = 0 <-- 1, a <-- s, and K = 0 in the excited nu2 vibrational state have been resolved and measured by sub-Doppler saturation spectroscopy using the Cologne terahertz spectrometer with an accuracy of about 1 kHz. The line frequencies of the hyperfine structures of the rotation invers...

in this research we have studied tabriz temperature inversion using radio-sound information, during the 2004-2008 periods in daily, monthly and seasonally scales. produced data associated with temperature inversion daily of the surface (2 meters) to 700 h.pa. several different measures are used, including the height of the base and the height of the top of the inversion, the temperature at the ...

A new complex Jacobi iterative technique adapted for the solution of three-dimensional (3D) wide-angle (WA) beam propagation is presented. The beam propagation equation for analysis of optical propagation in waveguide structures is based on a novel modified Padé(1,1) approximant operator, which gives evanescent waves the desired damping. The resulting approach allows more accurate approximation...

The Lattrell-Dax method of nitrite-mediated substitution of carbohydrate triflates is an efficient method to generate structures of inverse configuration. In this study it has been demonstrated that a neighboring equatorial ester group plays a highly important role in this carbohydrate epimerization reaction, inducing the formation of inversion compounds in good yields. Based on this effect, ef...

a detailed standard magnetotelluric (mt) study was conducted to recognize brine bearing layers in depths of less than 2000 m in the northeast of iran close to the southeastern shore of the caspian sea. long and medium period natural-field mt methods have proved very useful for subsurface mapping purpose by determining the resistivity of the near surface structure. mt data were analyzed and mode...

Abstract Multi-frequency and multi-component extra-deep azimuthal resistivity measurements with depth of investigation a few tens meters provide advanced possibilities for mapping complex reservoir structures. Inversion the induction set becomes an important technical problem. We present regularized Levenberg–Marquardt algorithm inversion in 2D environment model pixel-based distribution. The co...

Macrofibers in steady-state growth at one temperature were subjected to pulses of various durations at a temperature at which the opposite helix hand would form and then returned to the initial temperature. In an upshift pulse (20 to 48 degrees C), at least 3 min of incubation was required to induce a transient inversion that occurred later after return to 20 degrees C. Longer pulses resulted i...

magnetic data inversion has a prominent role in geo-structural investigations. as lots of geological structures, such as faults, dykes, contacts etc are elongated in a specific direction, 2d algorithms became widespread during the previous years. modifying the existing algorithms on 3d data inversion, a method has been proposed for 2d inversion of profile magnetic data, based on the physical pa...