Improved superconducting hot-electron bolometer devices for the THz range

Improved and reproducible heterodyne mixing (noise temperatures of 950 K at 2.5 THz) has been realized with NbN based hot-electron superconducting devices with low contact resistances. A distributed temperature numerical model of the NbN bridge, based on a local electron and a phonon temperature, has been used to understand the physical...

Doubling of sensitivity and bandwidth in phonon cooled hot electron bolometer mixers

We demonstrate that the performance of NbN lattice cooled hot electron bolometer mixers depends strongly on the interface quality between the bolometer and the contact structure. We show experimentally that both the receiver noise temperature and the gain bandwidth can be improved by more than a factor of 2 by cleaning the interface and adding...

Free surface numerical modelling of wave interaction with coastal structures

The main objective of Workpackage 5 is to use numerical simulation of wave overtopping in order to solve the problem of suspected scale effects. A second, related, objective is to improve existing codes in such a way as they are able to simulate wave overtopping in a reliable way. The final, single, objective is to numerically model long waves...

Study on mechanism for water pricing

Water resources contribute greatly to human well being, both directly and indirectly. Water resources are irreplaceable natural resources, and are limited. However, due to a growing population and related economic development, the water demand from urban, industry and agriculture has increased dramatically. Water shortage has become one of the...

Thermal time constant of Nb diffusion-cooled superconducting hot-electron bolometer mixers

Nb superconducting hot electron bolometer mixers coupled with microstrip lines

Superconducting transition metal nitride films for THz SIS mixers

The experimental and numerical study of flow structure and water noise caused by roughness of the body

Numerical simulation of scale effect on ship stern flow and hydrodynamic performance

A Numerical Wave Model for the Refraction and Diffraction of Irregular Waves. Part II: Numerical Experiments of the Wave Model CREON

The numerical wave model CREON is developed to predict the propagation and transformation of wave properties in shallow water. In Gao et al. (1993), which is referred to as Part I in the following, a description is given of the theoretical and numerical treatment of the model. In the present report, we present various computational results. The...

Lateral-superlattice effect on weak localization in silicon inversion layers

Quantum interference and confinement effects in narrow channel Si-MOSFET's

One-dimensional subband effects in the conductance of multiple quantum wires in Si metal-oxide-semiconductor field-effect transistors