Steven Zhang

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Hatem Taha

University of Baghdad

Riau University

Obafemi Awolowo University, Ile-Ife, Nigeria

Bidini A Taleatu

Obafemi Awolowo University,Ile-Ife,Nigeria

PRAVEEN KUMAR

Yogi Vemana University

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National Institute of Technology, Warangal

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Papers by Steven Zhang

Synchrotron radiation photoelectron spectroscopy study of ITO surface

Applied Surface Science, 2000

. Synchrotron radiation photoelectron spectroscopy SRPES has been applied to surface analysis of ... more . Synchrotron radiation photoelectron spectroscopy SRPES has been applied to surface analysis of indium tin oxide Ž . ITO thin films. Several different components of In and Sn were observed at the clean ITO surface. By comparing the chemical compositions of the film before and after vacuum annealing, the contents of In O and Sn O were found to be 2 3yx 3 4 the major factors influencing the electrical conductivity and optical transparency of the film. q

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Intersubband transitions in molecular-beam-epitaxy-grown wide band gap II-VI semiconductors

Journal of Vacuum Science & Technology B, 2007

The authors report the study of intersubband transitions in ZnCdMgSe-based wide band gap II-VI se... more The authors report the study of intersubband transitions in ZnCdMgSe-based wide band gap II-VI semiconductors. The samples were prepared by molecular beam epitaxy on InP substrates. Both ZnCdSe/ ZnCdMgSe multiple quantum wells and CdSe/ ZnCdMgSe quantum dot multilayer stacks were grown. Strong intersubband absorption was observed in the samples. The results show that these materials are very promising for fabricating intersubband devices in the mid-and near-infrared spectral ranges.

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Generalization of the Landau-Lifshitz-Gilbert Equation for Conducting Ferromagnets

Physical Review Letters, 2009

We propose an extension of the Landau-Lifshitz-Gilbert (LLG) equation by explicitly including the... more We propose an extension of the Landau-Lifshitz-Gilbert (LLG) equation by explicitly including the role of conduction electrons in magnetization dynamics of conducting ferromagnets. The temporal and spatial dependent magnetization order parameter m(r,t) generates both electrical and spin currents that provide dissipation of the energy and angular momentum of the processing magnet. The resulting LLG equation contains highly spatial dependence of damping term and thus micromagnetic simulations based on the standard LLG equation should be reexamined for magnetization dynamics involving narrow domain walls and spin waves with short wavelengths.

IMMUNOLOCALIZATION OF APOLIPOPROTEIN D, ANDROGEN RECEPTOR AND PROSTATE SPECIFIC ANTIGEN IN EARLY STAGE PROSTATE CANCERS

Journal of Urology, 1998

Purpose: To determine the cellular distribution and levels of immunohistochemical staining for ap... more Purpose: To determine the cellular distribution and levels of immunohistochemical staining for apolipoprotein D (Apo-D), prostate specific antigen (PSA) and androgen receptor (AR) in early stage prostate cancers. Materials and Methods: Cellular distribution of Apo-D, PSA and AR in 30 stage A/B prostate cancers and in non-malignant glandular tissue contained in the same sections was detected immunohiatochemically, and staining was evaluated by computerized video image analysis. Results: Staining for Apo-D (percentage positive cellular area) was significantly increased in tumor cells of early stage prostate cancers compared with non-malignant glandular tissue. PSA and AR were present at high levels in both early stage prostate tumors and non-malignant prostate. Conclusions: Malignant transformation in the prostate is associated with increased cellular levels of Apo-D. Kcr WO-: prostatic neoplasms, immunohistochemistry, apolipoproteins, androgen receptor, prostate specific antigen 153, 1990.

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Performance and Modeling of the JLAB IR FEL Upgrade Injector

The 10kW Upgrade IR FEL DC Photocathode Gun is an upgrade version of the 1 kW IR Demo DC Photocat... more The 10kW Upgrade IR FEL DC Photocathode Gun is an upgrade version of the 1 kW IR Demo DC Photocathode Gun, which was operated at 320 kV and achieved 5 mA of CW beam at 37.425 MHz (fortieth subharmonic of the accelerator rf fundamental frequency, 1.497 GHz) with 135 pC per bunch . With a new 600 kV DC HVPS the current capability in the Upgrade Gun has been increased from 5 mA to 10 mA at 74.85 MHz and 135 pC/bunch, as required by the 10kW Upgrade IR FEL . The 10kW Upgrade IR FEL Injector has delivered up to 9.1 mA of recirculated CW beam at 9.1 MeV with the gun operating at 350 kV and 122 pC/bunch. Pulsed operation has also been demonstrated. 8 mA/pulse in 2-16 ms-long pulses have been achieved with the drive laser operating at 75 MHz (micro-pulse frequency) and 2 Hz repetition rate. The gun routinely delivers 350 kV, 5 mA pulsed and CW beam for FEL operations. The charge extracted from the photocathode between re-cesiations is on the order of 200 C. A typical day of operations draws between 30 and 40 Coulombs from the photocathode.

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Synchrotron radiation photoelectron spectroscopy study of ITO surface

Applied Surface Science, 2000

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Intersubband transitions in molecular-beam-epitaxy-grown wide band gap II-VI semiconductors

Journal of Vacuum Science & Technology B, 2007

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Generalization of the Landau-Lifshitz-Gilbert Equation for Conducting Ferromagnets

Physical Review Letters, 2009