Creating extended, highly homogeneous plasma columns like that required by wakefield accelerators can be a challenge. We study the propagation of ultra-short, TW power ionizing laser pulses in 10-meter-long rubidium vapor and they create. perform experiments numerical simulations for with 780 nm central wavelength, which is resonant D$_2$ transition from ground state atoms, as well 810 some dis...

Soft Switcing techniques have recently been applied in the design of dc-ac converters, in order to achive better performance, higher efficiency, and power density. One of the soft switching techniques uesd in inverters is resonant dc links. These topologies have some disadvantages such as irregular current peaks, large voltage peaks, uncotrollble pulse width, etc. Another soft switching method ...

called maximum shear modulus, Gmax. It can be determined by in-situ methods from the measurements of the shear wave velocity, Vs, by means of crosshole, down-hole, up-hole, or surface wave testing. The relationship between maximum shear modulus and shear wave velocity is rigorous: 2 max s G V    where ρ is soil density. This parameter can be also obtained in laboratory by resonant column or ...

This paper addresses the differences between two approaches of damping estimation in resonant column testing: Steady-State Vibration (SSV) and Free Decay (FVD) method, at small (<0.005%) to medium (0.07%) strain range. The tests were conducted on “two types reconstituted sands” clayey soils” different relative densities confining pressures. test results suggested use SSV method measurement FVD ...

In this article, the diocotron modes developing in a coaxial diode and resonant magnetron forming six-vane A6 relativistic both fed by split cathode are studied Particle-in-Cell simulations. The is novel type of which sustains column longitudinally oscillating electrons (smooth bore) or over non-emitting axial conductor. connection between longitudinal oscillatory dynamics mode development, as ...

In this paper a resonant tunnelling quantum well infrared photodetector (RT-QWIP) is discussed. Each period of this photodetector structure comprises of a resonant tunnelling structure (AlAs/AlGaAs/AlAs) nearby a quantum well (AlGaAs/GaAs). In this photodetector, photocurrent is produced when an electron makes a transition from the ground state of the well to an excited state which is coupled t...