Physics Commons^™

Measurement Of Branching Factions Of D Meson With Final State Including Kk, Peng Zhou

Wayne State University Dissertations

Using 818pb−1 of CLEO-c data at √s =3770 MeV, we measure precisely the branching ratios for four D+ → K+K−X hadronic channels. Our measurement improves the errors of B(D+ → K+K−π+π0) and B(D+ → φπ+π0) by factors of 10 respectively. We report first observation of the decay D+ → φρ+, as well as branching ratio measurements for two rare decays.

Raman Spectroscopy And Diffuse Reflectance Spectroscopy For Diagnosis Of Human Cancer And Acanthosis Nigricans, Suneetha Devpura

Wayne State University Dissertations

Cancer and diabetes are common chronic diseases in today's world causing numerous deaths in adults as well as children. Most common types of cancers in adults include prostate, lung, breast, colorectal and head and neck squamous cell carcinoma, while among children; leukemia, and brain and central nervous system cancers are quite common. In each of these cases, early detection of the cancer or disease dramatically increases the chances of successful treatment. In recent years, there has been much interest in using Raman spectroscopy and diffuse reflectance spectroscopy as analytical optical spectroscopic methods for early diagnosis of diseases. Raman spectroscopy can …

Search For Contact Interactions In The Dimuon Channel In P-P Collisions At Sqrt(S) = 7 Tev At Cms, Sowjanya Gollapinni

Wayne State University Dissertations

The standard model (SM) fails to explain the variety of observed quark and lepton flavors and their masses suggesting that there might exist a more fundamental basis. If quarks and leptons are composite

particles made up of more basic constituents, a new physics

interaction in the form of a four-fermion contact interaction

arises between them. Experimentally the signal is manifest as

a deviation from the SM prediction in the high-mass tail for

the invariant mass distribution of the opposite-sign dimuon pairs.

The Large Hadron Collider (LHC) experiment at the Center for

European Nuclear Research (CERN) is built to explore new …

Continuum Elasticity Modeling Of Nanostructure Evolution In Strained Film Epitaxy, Champika Gigiriwala Gamage

Wayne State University Dissertations

The formation of surface nanostructures such as islands or quantum dots during strained film epitaxy has attracted great interest in recent years. The underlying mechanisms have been attributed to the occurrence of morphological instabilities of the strained films, for which the coupling between film-substrate material properties and growth conditions play a major role. Morphological properties of an epitaxially grown film and the self-organization process of coherent strained islands are analyzed via the development of a continuum elasticity model based on the 2nd order perturbation method. Effects of wetting stress due to film-substrate interactions have been incorporated in the resulting nonlinear …

The Electrical Transport Study Of Graphene Nanoribbons And 2d Materials Beyond Graphene, Ming-Wei Lin

Wayne State University Dissertations

The electrical transport measurements on a suspended ultra-low-disorder graphene nanoribbon (GNR) with nearly atomically smooth edges that reveal a high mobility exceeding 3000 cm2 V-1 s-1 and an intrinsic bandgap was reported in this study. The experimentally derived bandgap is in quantitative agreement with the results of our electronic-structure calculations on chiral GNRs with comparable width taking into account the electron-electron interactions, indicating that the origin of the bandgap in non-armchair GNRs is partially due to the magnetic zigzag edges. In addition, electrical transport measurements show that current-annealing effectively removes the impurities on the suspended graphene nanoribbons, uncovering the intrinsic …

An Apparatus For Verification Of Absolute Calibration Of Quantum Effiency For Charge-Coupled Devices, Rebecca Ann Coles

Wayne State University Theses

The LBNL Microsystems Laboratory produces backside illuminated, high resistivity, p-channel, charge-coupled devices (CCDs). A system was developed to test the quantum efficiency (QE) of the CCDs; the percentage of electrons that are emitted from the CCD surface per amount of light that it's exposed to.

The QE system was designed and constructed to test CCDs of a much smaller size then what is currently produced. To continue testing, I redesigned the QE apparatus to make room for the new, larger size, CCDs while still preserving measurement accuracy. I removed the photodiode that formally sat alongside the CCD in the Dewar, …

Effects Of Transition Metal Doping On Multiferroic Ordering In Ni3v2o8 And Fevo4, Akila Deeghayu Kumarasiri

Wayne State University Dissertations

We have studied the effects of doping both non-magnetic and magnetic ions on the phase transitions and multiferroic ordering in two multiferroic oxides; Ni3V2O8 and FeVO4. Magnetic, dielectric, specific heat, polarization and AC susceptibility measurements were used to track changes in phase transition temperatures. We found that the two higher temperature magnetic transitions in Ni3V2O8; TH = 9.1 K and TL = 6.3 K are suppressed to lower temperatures with all transition metal dopants. For Zn doping, the rates of the suppression of both TH and TL with dopant fraction are consistent with simple site dilution for two-dimensional spin systems, …