iii Summary This master thesis describes the development of a new type RF PA and upconverter combination. Instead of the normally used voltage steering the amplifier uses charge steering. The parasitic capacitances of the MOSFET in combination with using charge steering form a feedback network that linearizes the amplifier. The developed device is a switching amplifier. For good behavior it use...

geometric and material nonlinear behavior of slender webs in i-column girders having stocky flanges under the action of combined lateral and axial loads is investigated. interaction curves corresponding to the application of compressive and shear loads at buckling and ultimate stages for both web plates and column sections are plotted. in addition, the effects of flange and web slenderness rati...

Current spaceborne NASA hyperspectral imaging instruments either avoid onboard compression or make use of only limited lossless image compression techniques during transmission. For example, the current state-of-practice for low-complexity space-qualified lossless compression hardware is to use the Universal Source Encoder for Space (USES) chip [1]. The USES chip implements the onedimensional R...

The effects of surface texture on the lubrication performance of a compression ring-cylinder liner system are studied in this paper. By considering the surface roughness of the compression ring and cylinder liner, a mixed lubrication model is presented to investigate the tribological behaviors of a barrel-shaped compression ring-cylinder liner system with spherical dimples on the liner. In orde...

The electromagnetic time-reversal (TR) technique has the characteristics of spatiotemporal focusing in a cavity (TRC), which can be used for pulse compression, thus forming an with high peak power. A time-reversed pulse-compression method single channel compression gain. However, only generate limited This paper proposes novel TR power-combination multichannel TRC to obtain higher power based o...

In order to maintain a reasonable over-all length at high center-of-mass energy, the main linac of an electronpositron linear collider must operate at a high accelerating gradient. For copper (non-superconducting) accelerator structures, this implies a high peak power per unit length and a high peak power per RF source, assuming a limited number of discrete sources are used. To provide this pow...

Supercontinuum generation in a highly nonlinear fiber pumped by noise-like pulses from an erbium-doped fiber ring laser is investigated. To generate ultrabroad spectra, a fiber amplifier is used to boost the power launched into the highly nonlinear fiber. After amplification, not only the average power of the noise-like pulses is enhanced but the spectrum of the pulses is also broadened due to ...

Code compression is a field where compression ratios between compiler-generated code and subsequent compressed code are highly dependent on decisions made at compile time. Most optimizations employed by compilers tend to focus on parameters such as program performance, minimizing resource dependencies and sometimes the option of reducing code size. This paper describes a post-compilation techni...

In this paper, we propose a visual importantdriven interactive rendering method for 3D model over 802.11 WLAN for overcoming the shortcomings of wireless network’s narrow bandwidth, high transmission error rates and mobile devices’ low power supply. This paper first proposes an efficient simplification method based on an improved visual important region detection technique. Then, we develop an ...

This paper presents a new multiresolution segmentationbased algorithm for image compression. High quality low bit rate image compression is achieved by recursively coding the Binary Space Partitioning (BSP) tree representation of images with multilevel Block Truncation Coding (BTC). Comparison with JPEG at rates below 0.25 bit/pixel shows superior performance both in terms of Power Signal-to-No...