1,072 research outputs found
CULTIVATION STRATEGY OF MARKETING TALENTS IN HIGHER EDUCATION BASED ON NEEDS AND CONSUMER PSYCHOLOGY
CULTIVATION STRATEGY OF MARKETING TALENTS IN HIGHER EDUCATION BASED ON NEEDS AND CONSUMER PSYCHOLOGY
Maize in China: Production Systems, Constraints, and Research Priorities
Crop Production/Industries, Research and Development/Tech Change/Emerging Technologies,
Modeling and mining term association for improving biomedical information retrieval performance
Novel interface-selected waves and their influences on wave competitions
The topic of interface effects in wave propagation has attracted great
attention due to their theoretical significance and practical importance. In
this paper we study nonlinear oscillatory systems consisting of two media
separated by an interface, and find a novel phenomenon: interface can select a
type of waves (ISWs). Under certain well defined parameter condition, these
waves propagate in two different media with same frequency and same wave
number; the interface of two media is transparent to these waves. The frequency
and wave number of these interface-selected waves (ISWs) are predicted
explicitly. Varying parameters from this parameter set, the wave numbers of two
domains become different, and the difference increases from zero continuously
as the distance between the given parameters and this parameter set increases
from zero. It is found that ISWs can play crucial roles in practical problems
of wave competitions, e.g., ISWs can suppress spirals and antispirals
Influences of spin accumulation on the intrinsic spin Hall effect in two dimensional electron gases with Rashba spin-orbit coupling
In a two dimensional electron gas with Rashba spin-orbit coupling, the
external electric field may cause a spin Hall current in the direction
perpendicular to the electric field. This effect was called the intrinsic spin
Hall effect. In this paper, we investigate the influences of spin accumulation
on this intrinsic spin Hall effect. We show that due to the existence of
boundaries in a real sample, the spin Hall current generated by the intrinsic
spin Hall effect will cause spin accumulation near the edges of the sample, and
in the presence of spin accumulation, the spin Hall conductivity will not have
a universal value. The influences of spin accumulation on the intrinsic spin
Hall effect in narrow strips of two dimensional electron gases with Rashba
spin-orbit coupling are investigated in detail.Comment: 7 pages, 2 figure
Sampling Deviation Real-time Calibration Method for Wideband Simulator
Hardware-in-the-loop simulation is an efficient method for research on radar system.Target’s echo which offered by the simulator should be synchronized with radar on frequency, time, and range bin. However, because simulator needs to take into account of the requirements of various types of radar, it is difficult to make the clock of simulator synchronized with the clock of radar. To solve the problem, synchronous sampling deviation model is established. Influence of sampling deviation on imaging is analyzed. An engineering method is put forward to eliminate the sampling deviation. This method not only provides a reference for simulation system, but also provides a reference for the design of radar system
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Kinetic Studies of Hydroxyl and Hydrogen Atom Reactions
Gas phase kinetics of the reactions involving hydroxyl radical and hydrogen atom were studied using experimental and ab initio theoretical techniques. The rate constant for the H + H2S reaction has been measured from 298 to 598 K by the laser photolysis/resonance fluorescence (LP-RF) technique. The transition state theory (TST) analysis coupled with the measurements support the suggestion that the reaction shows significant curvature in the Arrhenius plot. The LP-RF technique was also used to measure the rate constant of the H + CH3Br reaction over the temperature range 400-813 K. TST and density functional theory (DFT) calculations show that the dominant reaction channel is Br-abstraction. The reaction H + CF2=CF-CF=CF2 was first studied by flash photolysis/resonance fluorescence (FP-RF) method. The experiments of this work revealed distinctly non-Arrhenius behavior, which was interpreted in terms of a change in mechanism. DFT calculations suggest that the adduct is CF2H-CF•-CF=CF2. At lower temperatures a mixture of this molecule and CF2•-CFH-CF=CF2 is likely. The theoretical calculations show that H atom migrates in the fluoroethyl radicals through a bridging intermediate, and the barrier height for this process is lower in the less fluorinated ethyl radical. High level computations were also employed in studies of the rate constants of OH + chloroethylenes reactions. VTST calculations indicate that, except the reaction of OH + C2Cl4, these reactions present a complex behavior. For OH + C2Cl4, conventional TST calculation shows a simple positive temperature-dependence behavior
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