2,375 research outputs found
Research and development study related to the synthesis of formaldehyde from CO2 and H2 Quarterly progress report, Aug. - Oct. 1966
Formaldehyde synthesis procedures under space conditions, with bibliograph
Research and development study related to the synthesis of formaldehyde from CO2 and H2 Quarterly progress report, May - Jul. 1967
Synthesis of formaldehyde by oxidation of methan
Research and Development Study Related to the Synthesis of Formaldehyde from CO2 and H2 Quarterly Progress Report, Feb. - Apr. 1967
Oxidation of methane to formaldehyde in reactors coated with potassium tetraborat
Research and development study related to synthesis of formaldehyde from CO2 and H2 Quarterly progress report, Nov. 1966 - Jan. 1967
Solid catalyst selection for formaldehyde synthesis by methane oxidatio
Aerodynamic force measurements with a strain-gage balance in a cryogenic wind tunnel
Aerodynamic force measurements on a generalized 75 deg delta wing model with sharp leading edges were made with a three component internal strain gage balance in a cryogenic wind tunnel at stagnation temperatures of 300 K, 200 K, and 110 K. The feasibility of using a strain gage balance without thermal control in a cryogenic environment as well as the use of electrical resistance heaters, an insulator between the model and the balance, and a convection shield on the balance was investigated. Force and moment data on the delta wing model as measured by the balance are compared at the different temperatures while holding constant either the Reynolds number or the tunnel stagnation pressure. Tests were made at Mach numbers of 0.3 and 0.5 and at angles of attack up to 29 deg. The results indicate that it is feasible to acquire accurate force and moment data while operating at steady state thermal conditions in a cryogenic wind tunnel, either with or without electrical heaters on the balance. Within the limits of the balance accuracy, there were no apparent Reynolds number effects on the aerodynamic results for the delta wind model
Dynamical instabilities of Bose-Einstein condensates at the band-edge in one-dimensional optical lattices
We report on experiments that demonstrate dynamical instability in a
Bose-Einstein condensate at the band-edge of a one-dimensional optical lattice.
The instability manifests as rapid depletion of the condensate and conversion
to a thermal cloud. We consider the collisional processes that can occur in
such a system, and perform numerical modeling of the experiments using both a
mean-field and beyond mean-field approach. We compare our numerical results to
the experimental data, and find that the Gross-Pitaevskii equation is not able
to describe this experiment. Our beyond mean-field approach, known as the
truncated Wigner method, allows us to make quantitative predictions for the
processes of parametric growth and thermalization that are observed in the
laboratory, and we find good agreement with the experimental results.Comment: v2: Added several reference
Modern Holstein-origin dairy cows within grassland-based systems partition more feed nitrogen into milk and excrete less in manure
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