Results 231 to 240 of about 169,060 (266)

Dispersion relation in plasmas generated by a sheath-helix antenna

Journal of Applied Physics, 2002
A theoretical model of the plasmas generated by a sheath-helix antenna is developed for axisymmetric perturbations. The system configuration consists of a cylindrical plasma column inside a dielectric tube of radius Rc. The eigenvalue equation is obtained and the eigenfunction is identified as the Bessel function J0(x) of the first kind of order zero ...
Uhm, HS, Uhm, SH, Chang, HY Chang, Hong-Young   +2 more
openaire   +1 more source

The Differential Geometry of the General Helix as Applied to Mechanical Springs

Journal of Applied Mechanics, 1988
In order to improve the performance of helical springs, such as increasing the fatigue life and suppressing resonance, variable pitch angle and variable helix radius may be incorporated into the helical spring geometry. Employing the tool of differential geometry, new and complete formulae of curvature, torsion, and spring force are derived.
Yuyi Lin, Albert P. Pisano
openaire   +1 more source

Sites of action potential generation in Helix pomatia neurons

Neurophysiology, 1988
The site of action potential generation in unipolar snail neurons was identified by stimulating neurons isolated together with the initial portion of the process from the neuropile. Stimulation consisted of a sinusoidal from electrical current passed along the soma-axonal axis in saline solution.
V. N. Ierusalimskii, P. M. Balaban
openaire   +1 more source

Helix antennas for generators of short high-voltage pulses

2007 6th International Conference on Antenna Theory and Techniques, 2007
Distinctive features of high-voltage systems of generator and radiating antennas, that we developed, are: highest possible working voltage and electric field intensities in dielectric media of generator and antenna, limited from above by electric strength of dielectric media; possibility to connect small-size forming low-impedance output device of ...
openaire   +2 more sources

Mechanisms of Generation of Pacemaker Activity by Identified Helix Neurons

Neurophysiology, 2001
We studied the mechanisms of generation of pacemaker activity in identified neurons of Helix pomatia. For this purpose, we isolated the PPa2 and PPa7 neurons generating spontaneous rhythmic monomodal activity and PPa1 neuron with bursting activity. It was demonstrated that isolated PPa2 and PPa7 cells produce endogenous rhythmic activity that was not ...
N. I. Kononenko, O. V. Kostyuchenko
openaire   +1 more source

Generalized spin helix states in quantum spin graphs

Physica Scripta
Abstract In general, the summation of a set of sub-Hamiltonians cannot share a common eigenstate of each one, only if it is an unentangled product state, such as a spin helix state in quantum spin system. Here we present a method, referred to as the building block method (BBM), for constructing possible spin-1/2 XXZ Heisenberg lattice ...
C H Zhang, Y B Shi, Z Song
openaire   +1 more source

Helix Generation, Amplification, Switching, and Memory of Chromophoric Polymers

2007
The origin of biomolecular handedness known as homochirality in the animate world may be oneof the most puzzling issues among scientists. The cooperativity of amplification, switching, andmemory in biopolymers and synthetic helical polymers might be shared with ideas of a scenariofor the biomolecular homochirality, autocatalytic mechanism in chiral ...
openaire   +1 more source

Triple-helix polysaccharides: Formation mechanisms and analytical methods

Carbohydrate Polymers, 2021
Steve Cui, Qingbin Guo, Ji Kang
exaly  

Energetic approach to the packing of .alpha.-helixes. 2. General treatment of nonequivalent and nonregular helixes

Journal of the American Chemical Society, 1984
Kuo Chen Chou, George Nemethy, Harold A. Scheraga   +2 more
openaire   +1 more source

Basic Helix-Loop-Helix (bHLH) Transcription Factors Regulate a Wide Range of Functions in Arabidopsis

International Journal of Molecular Sciences, 2021
Aigen Fu
exaly