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The reactive ion etching ofInP, InGaAs, and InAIAs in CClzF2/02 or C2R(/H2 discharges was investigated as a function of the plasma parameters pressure, power density, flow rate, and relative composition. The etch rates of these materials are a factor of 3-5 X faster in CC12F 2/0 2 (-600--1000 AminJ ) compared to CzHJH2 (160-320 AminI ). Significantly smoother morphologies are obtained with C2H6...

The photochemistry of the stratosphere of Venus was modeled using an updated and expanded chemical scheme, combined with the results of recent observations and laboratory studies. We examined three models, with H2 mixing ratio equal to 2 x 10 3, 5 x 10t, and I x 103, respectively. All models satisfactorily account for the observations of CO, 02, 0 2 CA), and SO2 in the stratosphere, but only th...

Explicit forms of IBM Hamiltonians with a generalized partial dynamical O(6) symmetry are presented and compared with empirical data in 162Dy. A dynamical symmetry corresponds to a situation in which the Hamiltonian is written in terms of the Casimir operators of a chain of nested algebras G1 ⊃ G2 ⊃ . . . ⊃ Gn , (1) and has the following properties. (i) Solvability. (ii) Quantum numbers related...

Recently there has been much interest in linkages (bar-and-joint frameworks) that are locked or stuck in the sense that they cannot be moved into some other configuration while preserving the bar lengths and not crossing any bars. We propose a new algorithmic approach for analyzing whether planar linkages are locked in many cases of interest. The idea is to examine self-touching or degenerate f...

When intact nodulated roots of soybean (Glycine max L. Merr. nodulated with Bradyrhizobium japonicum strain USDA 16) were exposed to an atmosphere lacking N2 gas (Ar:02 80:20), total nitrogenase activity (measured as H2 evolution) and respiration (CO2 evolution) declined with time of exposure. In Ar-inhibited nodules, when the 02 concentration in the rhizosphere was increased in a linear 'ramp'...

We provide alternate necessary and/or sufficient conditions on the sign-changing coefficient p(t) for maximum principle second-order periodic problem \(u''=p(t) u + q(t) \) to hold, i.e., nonnegative \(q\) yield a nonpositive solution \(u\). See also https://ejde.math.txstate.edu/special/02/h2/abstr.html

Nonlinear mixed-model procedures for analysis of binary data were used to estimate heritability (h2), predict individual genetic merit, and determine genetic and environmental trends for four measures of stayability of beef females. Traits considered were probabilities of a female having 2 [S(2/1)], 5 [S(5/1)], 8 [S(8/1)] and 11 [S(11/1)] calves, given that she calved once. Colorado State Unive...

Using the field ion microscope as a flow reactor the catalytic oxidation of hydrogen by O2 on Pt has been studied by the ToF coincidence technique. The "imaging ions" consist mainly of H30+. less H20+ and to some extent field and coverage sensitive 02+ species. The product ion spectrum qualitatively coincides with that of pure water field desorbed at 300 K. On the oxygen side of the H2/02/Pt sy...