Semiconductor grade, solar silicon purification project

The conversion of metallurgical grade silicon into semiconductor grade silicon by way of a three step SiF2 polymer transport purification process was investigated. Developments in the following areas were also examined: (1) spectroscopic analysis and characterization of (SiF2) sub x polymer and Si sub x F sub y homologue conversion; (2) demonstration runs on the near continuous apparatus; (3) economic analysis; and (4) elemental analysis

Login History and CaRP for User Authentication

Password is main vulnerability in computer security. Passwords are commonly guessed by machine programs running dictionary attacks. Passwords main used for the authentication method in spite of security weaknesses. User authentication obviously practical issue. According to the view of a service provider this problem needs to be resolved within real-world constraints such as the available hardware and software infrastructures. According to user’s view user friendliness is a basic requirement Click based graphical password scheme provides a different approach to address the familiar image hotspot problem. Graphical password systems such as PassPoints, that frequently leads to weak password choices. So to provide user friend-liness and also the protection from various security attacks. In this, graphical password scheme, the click event is performed on various points on same or different images. DOI: 10.17762/ijritcc2321-8169.15064

A Novel method for user authentication by CaRP And Login History

Cyber security is the main challenge nowadays. Many authentication techniques are available for these, for unwanted access for more secure data is prohibited. Graphical and text password are used for user authentication process. Sometimes text passwords are not secured and graphical password are more secure but vulnerable to shoulders surfing attack. The click event on various points for user friend-lines and protection from various security attacks. In system, login history image file combined CaRP for user authentication to enhancing the more security level primitives .The image file contain details of login and logout for date, time all related information. The file is encrypted by DES algorithm and send that file on mail. It is higher security primitives for the user. online guessing attack, relay attacks and if combined with dual technology for shoulder surfing attack are new concepts are available. DOI: 10.17762/ijritcc2321-8169.15075

Doping dependence of the coupling of electrons to bosonic modes in the single-layer high-temperature Bi2Sr2CuO6 superconductor

A recent highlight in the study of high-Tc superconductors is the observation of band renormalization / self-energy effects on the quasiparticles. This is seen in the form of kinks in the quasiparticle dispersions as measured by photoemission and interpreted as signatures of collective bosonic modes coupling to the electrons. Here we compare for the first time the self-energies in an optimally doped and strongly overdoped, non-superconducting single-layer Bi-cuprate (Bi2Sr2CuO6). Besides the appearance of a strong overall weakening, we also find that weight of the self-energy in the overdoped system shifts to higher energies. We present evidence that this is related to a change in the coupling to c-axis phonons due to the rapid change of the c-axis screening in this doping range.Comment: 4 pages, 3 figure

Coupling Of The B1g Phonon To The Anti-Nodal Electronic States of Bi2Sr2Ca0.92Y0.08Cu2O(8+delta)

Angle-resolved photoemission spectroscopy (ARPES) on optimally doped Bi2Sr2Ca0.92Y0.08Cu2O(8+delta) uncovers a coupling of the electronic bands to a 40 meV mode in an extended k-space region away from the nodal direction, leading to a new interpretation of the strong renormalization of the electronic structure seen in Bi2212. Phenomenological agreements with neutron and Raman experiments suggest that this mode is the B1g oxygen bond-buckling phonon. A theoretical calculation based on this assignment reproduces the electronic renormalization seen in the data.Comment: 4 Pages, 4 Figures Updated Figures and Tex

Quantitative analysis of Sr2RuO4 ARPES spectra: Many-body interactions in a model Fermi liquid

ARPES spectra hold a wealth of information about the many-body interactions in a correlated material. However, the quantitative analysis of ARPES spectra to extract the various coupling parameters in a consistent manner is extremely challenging, even for a model Fermi liquid system. We propose a fitting procedure which allows quantitative access to the intrinsic lineshape, deconvolved of energy and momentum resolution effects, of the correlated 2-dimensional material Sr2RuO4. For the first time in correlated 2-dimensional materials, we find an ARPES linewidth that is narrower than its binding energy, a key property of quasiparticles within Fermi liquid theory. We also find that when the electron-electron scattering component is separated from the electron-phonon and impurity scattering terms it decreases with a functional form compatible with Fermi liquid theory as the Fermi energy is approached. In combination with the previously determined Fermi surface, these results give the first complete picture of a Fermi liquid system via ARPES. Furthermore, we show that the magnitude of the extracted imaginary part of the self-energy is in remarkable agreement with DC transport measurements.Comment: 10 pages, 5 figure