Digital Commons Network^™

Towards Quantum Communication With Electron Spins, D. S. Saraga, G. Burkard, J. C. Egues, H. A. Engel, P. Recher, Daniel Loss

Turkish Journal of Physics

We review our recent work towards quantum communication in a solid-state environment with qubits carried by electron spins. We propose three schemes to produce spin-entangled electrons, where the required separation of the partner electrons is achieved via Coulomb interaction. The non-product spin-states originate either from the Cooper pairs found in a superconductor, or in the ground state of a quantum dot with an even number of electrons. In a second stage, we show how spin-entanglement carried by a singlet can be detected in a beam-splitter geometry by an increased (bunching) or decreased (antibunching) noise signal. We also discuss how a …

First Principles Modeling Of Nanostructures, Serdar Öğüt

Turkish Journal of Physics

Among the various theoretical tools for investigating microscopic material properties, ab initio (first principles) methods based on density functional theory and pseudopotentials have had a very good track record over the last two decades in terms of accuracy, reliability, and efficiency. The application of these methods to nanostructures to investigate their structural, electronic, and optical properties has, however, not been quite straightforward due to the large computational demand and new physics inherent in the nanometer and sub-nanometer size region. One particularly useful extension to overcome the computational demand imposed by localized nanostructures has been the introduction of methods based on …

Quantum State Generation And Entanglement Manipulation Using Linear Optics, Şahi̇n Kaya Özdemi̇r, Takashi Yamamoto, Masato Koashi, Nobuyuki Imoto

Turkish Journal of Physics

Quantum information processing (QIP) requires unitary operations, measurements and synthesis, manipulation and characterization of arbitrary quantum states. Linear optics provides efficient tools for these purposes. In this review paper, we introduce the elements of linear optics toolbox, and briefly discuss some experimental and theoretical investigations using this toolbox. Our main focus will be the qubit state generation and entanglement extraction using linear optics toolbox.

Orbital Entanglement And Violation Of Bell Inequalities In The Presence Of Dephasing, P. Samuelsson, Eugene Sukhorukov, Markus Büttiker

Turkish Journal of Physics

We discuss orbital entanglement in mesoscopic conductors, focusing on the effect of dephasing. The entanglement is detected via violation of a Bell Inequality formulated in terms of zero-frequency current correlations. Following closely the recent work by Samuelsson, Sukhorukov and Büttiker [1], we investigate how the dephasing affects the possibility to violate the Bell Inequality and how system parameters can be adjusted for optimal violation.

Mesoscopic D-Wave Qubits: Can High-T_C Cuprates Play A Role In Quantum Computing?, Alexandre M. Zagoskin

Turkish Journal of Physics

Due to nontrivial orbital pairing symmetry, surfaces and interfaces of high-T_c superconductors support states which violate time-reversal (T-) symmetry. Such naturally degenerate states, useful as working states of a qubit, are standard for atomic or molecular-size qubit prototypes (e.g. based on nuclear spins), but exceptional for mesoscopic qubits. (In particular, they hold promise of a better scalability.) In these lectures I review the physics of T-breaking on surfaces and interfaces of high-T_c superconductors; then describe existing proposals for high-T_c based qubits and the current state of experiments; finally, I discuss the decoherence sources in the system, open questions, and future …

Cover And Contents

Turkish Journal of Physics

No abstract provided.

Mean Multiplicity Of Quark And Gluon Jets As A Function Of Opening Angle In E^{+}E^{-} \Rightarrow B\Overline{B} G Events, Ayda Beddall

Turkish Journal of Physics

A comparison of the properties of quark and gluon jets has been madeby Monte Carlo simulation of the reaction Z \rightarrow b \overline{b} g. The jet energy is held fixed for every 5 GeV between 15--30 GeV energies and the mean multiplicity of b-quark and gluon jets are obtained as function of the angle between them. It is seen that the jet properties not only depend on the jet energies but also on the angle between the jets.

Preparation And Optimization Of High Quality Tin Films, Özlem Duyar, Cengi̇z Koçum, H. Zafer Durusoy

Turkish Journal of Physics

TiN thin films have been deposited by DC reactive magnetron sputtering method on glass substrates. The effects of the substrate temperature and the substrate bias voltage on the structural, optical and electrical properties of the films were studied by using XRD, STM, optical transmission and resistivity measurements. The bias voltage was varied in the 0 to 200 V range for two substrate temperatures, 100 °C and 300 °C. The results showed that the substrate bias voltage influenced the stoichiometry and structure of the films. The smoothest and least porous TiN films were prepared at about 160 V substrate bias voltage …

Physical Properties Of Spray Pyrolysed Cds Thin Films, A. Ashour

Turkish Journal of Physics

Cadmium sulphide (CdS) thin films were prepared by chemical spray-pyrolysis technique. Cleaned glass substrates were used. The substrate temperature was varied in the range 200 -- 400 °C and seems to be one of the more important parameters affecting the physical properties of the semiconductor. The films were characterized by X-ray diffraction (XRD). XRD patterns indicated the presence of single-phase hexagonal CdS. The resistivity of the as-deposited films was found to vary in the range 10^3 - 10^5 \Omega. Cm, depending on the substrate temperature. Direct band gap values of 2.39--2.42 eV were obtained from optical absorption measurements.

Cover And Contents

Turkish Journal of Physics

No abstract provided.

Qce: A Simulator For Quantum Computer Hardware, Kristel Michielsen, Hans De Raedt

Turkish Journal of Physics

The Quantum Computer Emulator (QCE) described in this paper consists of a simulator of a generic, general purpose quantum computer and a graphical user interface. The latter is used to control the simulator, to define the hardware of the quantum computer and to debug and execute quantum algorithms. QCE runs in a Windows 98/NT/2000/ME/XP environment. It can be used to validate designs of physically realizable quantum processors and as an interactive educational tool to learn about quantum computers and quantum algorithms. A detailed exposition is given of the implementation of the CNOT and the Toffoli gate, the quantum Fourier transform, …

Cover And Contents

Turkish Journal of Physics

No abstract provided.

High-Pressure Phase Transition In Some Alkali Halides Using Interatomic Potential Model, Harun Reşi̇t Yazar

Turkish Journal of Physics

We have predicted the phase transition pressure in some alkali halides NaCl and KCl using an interatomic potential approach based on a rigid ion model. We have obtained phase transition pressures 28.69 and 2.4 GPa, respectively, and are in close agreement with their corresponding experimental transition pressures 29.0 and 2.0 GPa. This approach is promising with respect to the prediction of the phase transition pressures of other alkali halides.

Ventilator-Associated Pneumonia In A Multi-Hospital System: Differences In Microbiology By Location, Hilary M. Babcock, Jeanne E. Zack, Teresa Garrison, Ellen Trovillion, Marin H. Kollef, Victoria J. Fraser

Open Access Publications

No abstract provided.

Sensitivity To Changes In Disability After Stroke: A Comparison Of Four Scales Useful In Clinical Trials, Alexander W. Dromerick, Dorothy F. Edwards, Michael N. Diringer

Open Access Publications

No abstract provided.

Structural, Electrical And Spectral Studies On Double Rare-Earth Orthoferrites La_{1-X}Nd_Xfeo_3, O.M. Hemeda, Mohsen Mohamed Barakat, D. M. Hemeda

Turkish Journal of Physics

Samples of double rare-earth ferrite La_{1-x}Nd_xFeO_3 are synthesized by a high-temperature double sintering ceramic technique. X-ray diffraction shows that all compounds have an orthorhombic structure. The values of lattice parameter and the volume of the unit cell, changes with increasing Nd^{3+} content. The Goldschmidt tolerance factor decreases and goes far from unity with increasing Nd content. The samples containing Nd ions with x = 0.1, 0.2 and 0.3 have higher resistivity than that of LaFeO_{3}, but for x \ge 0.4 the resistivity decreases. The results indicate the presence of extrinsic semiconducting properties up to 100 °C above which the hopping …

Admittance And Impedance Spectroscopy On Cu(In,Ga)Se_2 Solar Cells, A. Sertap Kavasoglu, Habi̇be Bayhan

Turkish Journal of Physics

The present work reports some experimental results on the electrical properties of high efficiency ZnO/CdS/Cu(In,Ga)Se_2 heterojunction solar cells. Admittance spectroscopy has been employed for characterisation of the bulk and interface levels in the absorber Cu(In,Ga)Se_2 layer. The temperature dependent capacitance-frequency analysis indicated an emission from a shallow acceptor like defect level with an activation energy of about 75 meV. Information on the equivalent circuit model of the devices has been provided by the analysis of impedance measurements. The impedance data are presented in the Nyquist plot at several dc bias voltages at 300 K. The equivalent circuit model consisting of …

Software Project Management: The Role Of Modeling, Omar F. El-Gayar, Sreedhar Thota

Research & Publications

With the ubiquity of software and in the quest towards improving software development activities, the software engineering research community engaged in an active research agenda on modeling software processes. The modeling objectives ranged from process understanding, improvement, and management, to project management. In spite of the significant achievements in the field, few (if any) of the research results are adopted by the industry. This paper presents a brief review and a critical evaluation of the status of software process modeling practices with particular emphasis on their applications to project management from a practitioner's point of view as well as recommendations …

Aquaculture In Egypt And Issues For Sustainable Development, Omar F. El-Gayar

Research & Publications

Although aquaculture in Egypt has the potential for satisfying the increased demand for protein and has been experiencing unprecedented growth during the last decade, questions remain regarding the sustainable development of the industry. It is thus the objective of this article to review the current status and practices of the aquaculture industry in Egypt, highlighting the major issues confronting the sustainable development of the aquaculture industry.

Several issues are identified as limitations to future sustainable development, namely, production technology, fry supply, a feed industry sufficient to meet the demands of a growing aquaculture industry, and marketing and distribution systems necessary …

Behind The Screen. Pubmed Intricacies, Ibrahim Mansoor

Saudi Medical Journal

No abstract provided.

A Scoring System As A Tool For Antenatal Care Audit In Family Medicine, Rabaa K. Al-Momen, Izzeldin El-Jack, Noura A. Al-Nowaiser, Noura A. Al-Rowais

Saudi Medical Journal

OBJECTIVE: To propose the antenatal assessment score (AAS) as a tool for auditing the process of antenatal care in family medicine, and to highlight its accessibility by applying it at 2 family health care centers. METHODS: A descriptive study of an audit process was conducted in 2 primary health care centers (non commissioned officers9 [NCO] and officers9 health centers [OC]) belonging to the Department of Family Medicine, Armed Forces Hospital, Riyadh, Kingdom of Saudi Arabia from February 2001 to June 2002. A systematic random sample of patients registered at the maternal registers of both centers was selected. A score system …

Prevalence And Correlates Of Nocturnal Enuresis In The United Arab Emirates, Valsamma Eapen, Abdulazim M. Mabrouk

Saudi Medical Journal

OBJECTIVE: To determine the prevalence, socio-demographic correlates and associated psychopathology in children with enuresis. METHODS: A community survey of a stratified sample of 400 6-16 year old school children was carried out in the Al-Ain City, United Arab Emirates. Psychiatric disturbance, if any, was ascertained using the Rutter Parent Scale. RESULTS: Thirty-two out of the 400 children (8%) surveyed, reported wetting the bed at least once per week. More boys were affected than girls, and 90% of those with enuresis were aged 6-11 years. Presence of enuresis was found to be associated with psychosocial stress in the family; large family …

Supporting ‘Word-Of-Mouth’ Social Networks Through Collaborative Information Filtering, Mimi Recker, Andrew Walker

Instructional Technology and Learning Sciences Faculty Publications

Altered Vista is an instructional system that supports a form of ‘contextual’ collaborative learning. Its design incorporates an information filtering technique, called collaborative information filtering, which, through computational and statistical means, leverages the work of individuals to benefit a group of users. Altered Vista is designed to provide, upon request, personalized recommendations of Web sites. It can also provide recommendations of like-minded people, thus setting the stage for future collaboration and communication. An empirical study involving in-service and pre-service teachers was conducted using Altered Vista and presents results from an empirical study. The study examined the feasibility and utility of …

Theories Of Distributive Justice And Limitations On Taxation: What Rawls Demands From Tax Systems Symposium - Rawls And The Law: Panel Vi: Property, Taxation, And Distributive Justice, Linda Sugin

Faculty Scholarship

This Essay attempts to map out how such an inquiry would be conducted in light of Rawls. Rather than searching in theories of justice for required precepts of taxation, we might more fruitfully ask what constraints, if any, a particular theory of justice imposes on the tax system. Application of such an approach to Rawls's theory of justice may explain his apparent preference for a flat consumptionbased tax. This preference is otherwise quite puzzling in light of much of what Rawls wrote about economic justice, and might lead us to expect him to endorse a progressive income tax. If Rawls's …

States And Internet Enforcement, Joel R. Reidenberg

Faculty Scholarship

This essay addresses the enforcement of decisions through internet instruments. The starting point is a brief justification of internet enforcement as the obligation of democratic states. Next, the essay argues that the movement to re-engineer the internet infrastructure by public and private actions also facilitates state enforcement of legal and policy decisions. The essay maintains that states will increasingly try to use network intermediaries such as payment systems and Internet Service Providers as enforcement instruments. Finally, and most importantly, the essay focuses on ways that states may harness the power of technological instruments such as worms, filters and packet interceptors …

The (Un)Favorable Judgment Of History: Deportation Hearings, The Palmer Raids, And The Meaning Of History, Harlan G. Cohen

Faculty Scholarship

As Americans respond to the events of September 11, 2001, they are being forced to contemplate their place in American history-past, present, and future. This has become particularly stark in the fight over secret deportation hearings. Following September 11, Attorney General John Ashcroft announced that the deportation hearings of "special interest" aliens would be closed to the public. Applying Richmond Newspapers's two-pronged logic-and-experience test, the Third and Sixth Circuits subsequently split over the constitutionality of the blanket closure. At the heart of their disagreement was the scarce history of deportation hearings and whether such hearings had been closed in the …

Involvement Of Fatty Acid Pathways And Cortical Interaction Of The Pronuclear Complex In Caenorhabditis Elegans Embryonic Polarity, Chad A. Rappleye, Akiko Tagawa, Nathalie Le Bot, Julie Ahringer, Raffi V. Aroian

Open Access Publications

No abstract provided.

Analysis And Functional Classification Of Transcripts From The Nematode Meloidogyne Incognita, James P. Mccarter, Makedonka Dautova Mitreva, John Martin, Mike Dante, Todd Wylie, Uma Rao, Deana Pape, Yvette Bowers, Brenda Theising, Claire V. Murphy, Andrew P. Kloek, Brandi J. Chiapelli, Sandra W. Clifton, David Mck Bird, Robert H. Waterston

Open Access Publications

No abstract provided.

The Shield 2003, Shield

Murray State University Yearbooks

Murray State University Yearbook, 2003

Rit Dividends Winter 2003

RIT Digital Archives

No abstract provided.