the experimental studies of methane conversion to higher hydrocarbons and methanol using a dielectric barrier discharge (dbd) reactor are presented in this article. the process is carried out at ambient atmospheric pressure and temperature. the dbd reactor is stimulated by an alternative voltage of 50 hz and amplitude of max.23kv. the examination of the effect of voltage and flow rates on metha...

The cloud vertical structure, including top and base heights, layer thickness, and the characteristics of multilayered clouds, has been examined by Wang et al. (1995) by using radiosonde data. Cloudy layers are identified by relative humidity (RH) values above a threshold value of 84%. Cloud-layer top and base are identified by sudden changes in RH. These changes are positive at the base and ne...

We report on the pressure dependence of the threshold current in 1.3 mm InGaAsP and 1.5 mm InGaAs quantum-well lasers measured at low temperatures ,100 K. It was found that the threshold current of both devices slowly increases with increasing pressure (i.e., increasing band gap) at ,100 K consistent with the calculated variation of the radiative current. In contrast, at room temperature we obs...

Atmospheric dust concentrations are very sensitive to the dust surface emissions that are mainly controlled by saltation and sandblasting processes. Thus, a correct modeling of concentrations directly depends on mass flux parameterization accuracy. In 2001, Alfaro and Gomes proposed a whole set of parameterizations linking the dust flux to surface wind speed and soil characteristics. Their form...

Routine observations of the Crab Nebula for a total of about 250 hrs, performed with the HEGRA stereoscopic system of 5 imaging atmospheric Čerenkov telescopes in the standard operational mode, have proven the energy threshold of the system to be 500 GeV for small zenith angles (θ ≤ 20◦). A topological trigger applied along with the convergent observational mode allows to reduce noticeably the ...

A large number of experiments of different types have provided strong evidence for neutrino oscillations and thus for physics beyond the Standard Model (see Ref. [1] and references therein). Cosmic ray interactions in the atmosphere give a natural source of neutrinos. These atmospheric neutrinos in the GeV range have been used by the Super-Kamiokande (SK) detector to provide evidence for neutri...

In this research, an improved binary material-classification algorithm is developed to discriminate between metals and dielectrics using passive polarimetric imagery degraded by atmospheric turbulence. The technique implements a modified version of an existing polarimetric blind-deconvolution algorithm in order to remove atmospheric distortion and correctly classify the unknown object. The clas...

Room-temperature (RT) pulsed operation of blue (420 nm) nitride-based multiquantum-well laser diodes grown on a-plane and c-plane sapphire substrates has been demonstrated. Structures investigated include etched and cleaved facets as well as doped and undoped quantum wells. A combination of atmospheric and low-pressure metal organic chemical vapor deposition using a modified two-flow horizontal...