in this work a new resistance model has been presented based on that of henis-tripodi which can be used for interpretation of gas permeation data in composite and asymmetric membranes. in contrast to the previous works, in this model the fraction of the support layer surface that includes the pores filled with coating material has been taken into account. the influences of the filled pores on s...

trifluoromethylated organic compounds, especially chiral quaternary alcohols bearing trifluoromethyl group are of important intermediates in drugs, agrochemicals and etc.an efficient epoxidation of β-cf3-β,β-disubstituted unsaturated ketones (6) has been developed with environmental benign hydrogen peroxide as the oxidant and f5-substituted chiral quaternary ammonium salt (1g or 5) derived from...

background: existence or non-existence of adverse selection in insurance market is one of the important cases that have always been considered by insurers. adverse selection is one of the consequences of asymmetric information. theory of adverse selection states that high-risk individuals demand the insurance service more than low risk individuals do. methods: the presence of adverse selection ...

We present a new exciton-based formalism for calculating the coherent response of asymmetric semiconductor multiple quantum well structures to ultrashort optical pulses valid to infinite order in the optical field and including the self-generated intraband fields. We use these equations to calculate and explain the oscillations with time delay of peaks in the spectrally resolved degenerate four...

A pair of two dimensional fast cameras with a wide angle view (allowing a full radial and toroidal coverage of the lower divertor) was installed in the National Spherical Torus Experiment in order to monitor non-axisymmetric effects. A custom polar remapping procedure and an absolute photometric calibration enabled the easier visualization and quantitative analysis of non-axisymmetric plasma ma...

Ripples in magnetic or electrostatic confinement fields give rise to trapping separatrices, and the conventional neoclassical helical ripple transport describes phenomena coming from the collisional trapping/detrapping of particles in the helical ripple wells. Our experiments and novel theory have now characterized a new kind of neoclassical transport processes arising from chaotic (collisionle...

For an electron plasma which is magnetically confined in a cylindrical field geometry, radial expansion occurs only if the angular momentum of the plasma changes. We discuss nonlinear collective processes by which perturbing, static, asymmetric fields can transfer angular momentum, but not energy, to the plasma and produce radial expansion. For example, the field asymmetry can act as a pump whi...

We consider neural network models described by systems of (continuous time) differential equations. Th e dynamical nature of each model is identified, symmet ric networks being relat ed to gradient vector fields and asymmet ric networks decomposed into their gradient and Hamilt onian components . From thi s identification follows, in particular , a simple characterizat ion of st ructural stabil...

A new exponent characterizing the rounding of crystal facets is found by mapping a crystal surface onto the asymmetric six–vertex model (i.e. with external fields h and v) and using the Bethe Ansatz to obtain appropriate expansions of the free energy close to criticality. Leading order exponents in δh, δv are determined along the whole phase boundary and in an arbitrary direction. A possible ex...

Optical sensors that respond to enantiomeric excess of chiral analytes are highly demanded in chirality related research fields and demonstrate their potential in many applications, for example, screening of asymmetric reaction products. Most sensors developed so far are small molecules. This Tutorial Review covers recent advances in chirality sensing systems that are different from the traditi...