CHAPTER 1 GENERAL INTRODUCTION Introduction Literature review Formation and stability of metallic glass Crystallization of Zr-based metallic glass Experimental methods Thesis organization Reference CHAPTER 2 INFLUENCE OF PD ON FORMATION OF AMORPHOUS AND QUASICRYSTAL PHASES IN RAPIDLY QUENCHED ZR 2 CU (1-X) PD X Abstract Introduction Experimental Results and discussion Structure of as quenched Zr 2 Cu (1-x) Pd x alloys Thermal characteristics study on as quenched Zr 2 Cu (1-x) Pd x alloys Conclusion Acknowledgements References CHAPTER 3 THEORETICAL AND EXPERIMENTAL STUDIES OF DEVITRIFICATION PATHWAYS IN THE ZR 2 CU 1-X PD X METALLIC GLASS SYSTEM Abstract Introduction Methods Experimental Electronic structure calculations Results Devitrification pathways Theoretical calculations Discussion Acknowledgements References iv CHAPTER 4 IN SITU OBSERVATION OF THERMAL EXPANSION OF TETRAGONAL C11B PHASE IN ZR 2 CU (1-X) PD X ALLOYS Abstract Introduction Experimental Results and discussion C11b phase structure with composition: changes of lattice parameters and bond lengths C11b phase structure with temperature: anisotropic thermal expansions Conclusion Acknowledgements References CHAPTER 5 PHASE STABILITY AND TRANSFORMATIONS IN THE ZR 2 NI X CU 1-X SYSTEM Abstract Introduction Methods Experimental Electronic structure calculations Results Discussion Conclusions Acknowledgements References

Abstract-This paper presents a 115-mW Global Positioning System radio receiver that is implemented in a 0.5-m CMOS technology. The receiver includes the complete analog signal path, comprising a low-noise amplifier, I-Q mixers, on-chip active filters, and 1-bit analog-digital converters. In addition, it includes a low-power phase-locked loop that synthesizes the first local oscillator. The receiver achieves a 2.8-dB noise figure (prelimiter), a 56-dB spurious-free dynamic range, and a 17-dB signal-to-noise ratio for a noncoherent digital back-end implementation when detecting a signal power of 0130 dBm at the radio-frequency input.

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ZrSiO 4 powder synthesized by the sol-gel method is used to study the reaction mechanism of natural zircon mineral treated by an alkali fusion method. The reaction processes are analyzed by in situ Raman spectroscopy. Other characterization experiments using techniques, such as FTIR spectroscopy, TG-DTA and X-ray powder diffraction complement and verify the Raman spectroscopy study. The results reveal that hydroxylation-dehydration play important roles during the alkali-fusion process. Hydroxylation action breaks some bonds between Si and O in silicon-oxygen tetrahedral and releases zircon as ZrO 2 and silanol groups and then dehydration makes SiO 4 tetrahedron polymerize to the silicate with different lattice structure. The electron-donating ability of the O atom in molten alkali determines the number of Si-O bonds broken in SiO 4 tetrahedral and the lattice structure of silicate products. Finally, with further development of the reaction, the bridge-oxygen bonds of intermediate products are substitutes for nonbridging-oxygen bonds.