Thermodynamics of pseudospin-electron model in mean field approximation

The mean field type approach based on the self-consistent consideration of an effective field created by electron transfer is developed for a description of thermodynamics of the Hubbard type models with an infinitely large on-site repulsion. This procedure, formulated by Izyumov et al, is an extension of the recently proposed generalized random phase approximation(GRPA). Within this approach, the thermodynamic properties of the two-sublattice pseudospin-electron model (the Hubbard model with local anharmonicity) are studied. Such a model can be used for a description of dielectric properties of YBaCuO-type superconductors along c-axis; pseudospins represent anharmonic motions of apical oxygens O4. It is shown that there are either phase transitions in the model with jumps of the mean values of a pseudospin and of electron concentration (in the $\mu=const$ regime) or the phase separation (in the $n=const$ regime). The phase transitions or phase separation are caused by pseudospin-pseudospin interaction as well as by electron transfer (the latter results in appearing of effective interaction between pseudospins). The possibility of the ferroelectric type ordering of pseudospins is investigated.Comment: 17 pages, 7 figure

See You Later, Aggregator: How Hot News Misappropriation Deters Aggregators Without Overprotecting Facts

As traditional media scramble to find ways to monetize online content, the ease of digital publishing and online dissemination of news have led to a rise of a new form of news media: News aggregators. News aggregators compile information from journalism websites by various means, often drawing potential readers away from traditional news outlets, thus siphoning off advertising revenue from traditional journalism outlets, with little to no cost to the aggregators. News establishments have sought legal redress by claiming copyright infringement and hot news misappropriation, a state unfair competition common law principle created in 1918. Hot news misappropriation prevents direct competitors from distributing a journalism organization’s time-sensitive news, or “hot news,” for a limited time. But questions have unsettled both aggregators and content creators: How long is hot news protected as “hot?” Does this timed injunction violate the First Amendment? This thesis argues that hot news misappropriation is necessary to protect hot news and that it can do so in a way that does not violate the First Amendment. The hot news doctrine protects a right similar to the right of first publication, but only between direct competitors. Though existing case law is limited, this thesis also reviews past hot news cases and proposes guidelines in deciding the duration of protection of hot news and how they can be uniformly applied through federalization of the doctrine. Adviser: John Bende

Potential Bluetooth vulnerabilities in smartphones

Smartphone vendors have been increasingly integrating Bluetooth technology into their devices to increase accessible and convenience for users. As the current inclination of integrating PDA and telephony increase, the likelihood of sensitive information being stored on such a device is also increased. Potential Bluetooth vulnerabilities could provide alternative means to compromise Bluetooth-enable smartphones, leading to severe data breaches. This paper gives an insight on potential security vulnerabilities in Bluetooth-enabled smartphones and how these vulnerabilities may affect smartphone users. This paper is discussed from the viewpoint of Bluetooth weaknesses and implementation flaws, which includes pairing, weak key storage, key disclosure, key database modification, unit key weaknesses, manipulating sent data, locating tracking, implementation flaws, disclosure of undiscoverable devices, denial of service, device-based authentication, and uncontrolled propagation of Bluetooth waves, as well as Blueprinting and relay attacks

See You Later, Aggregator: How Hot News Misappropriation Deters Aggregators Without Overprotecting Facts

As traditional media scramble to find ways to monetize online content, the ease of digital publishing and online dissemination of news have led to a rise of a new form of news media: News aggregators. News aggregators compile information from journalism websites by various means, often drawing potential readers away from traditional news outlets, thus siphoning off advertising revenue from traditional journalism outlets, with little to no cost to the aggregators. News establishments have sought legal redress by claiming copyright infringement and hot news misappropriation, a state unfair competition common law principle created in 1918. Hot news misappropriation prevents direct competitors from distributing a journalism organization’s time-sensitive news, or “hot news,” for a limited time. But questions have unsettled both aggregators and content creators: How long is hot news protected as “hot?” Does this timed injunction violate the First Amendment? This thesis argues that hot news misappropriation is necessary to protect hot news and that it can do so in a way that does not violate the First Amendment. The hot news doctrine protects a right similar to the right of first publication, but only between direct competitors. Though existing case law is limited, this thesis also reviews past hot news cases and proposes guidelines in deciding the duration of protection of hot news and how they can be uniformly applied through federalization of the doctrine. Adviser: John Bende

Free radical reactions of allylic and propargylic derivatives

Addition of tert-butyl radical, generated from t-BuHgCl, to allyl or propargyl derivatives forms adduct radicals which can undergo [beta]-elimination with substituents such as halogen, PhS, PhSO[subscript]2 to form the alkyl-substituted propene or allene and an eliminated radical which regenerates the tert-butyl radical by displacement from t-BuHgCl. With [beta]-oxy substituents, such as O[subscript]2CR, OP(O)(OEt)[subscript]2, O[subscript]3SAr, the adduct radical can displace the alkyl radical from alkylmercurial to yield the [beta]-substituted alkylmercurials which spontaneously, or in the presence of nucleophiles, undergo an elimination reaction to yield the alkene or allene. Relative reactivities towards tert-butyl radical attack, such as k(allyl chloride) / k(propargyl chloride) ≅ 10, have been determined. A similar relative reactivity is observed in reaction with (t-Bu)[subscript]2CuLi, implicating attack by tert-butyl radical. With propargyl iodide, radical attack leads to iodine atom abstraction. Reaction of propargyl iodide with t-BuHgCl / h[upsilon], (t-Bu)[subscript]2CuLi, or (t-Bu)[subscript]3ZnLi leads to a mixture of hydrocarbons in which tert-butylallene is present in only trace amounts. Benzene is an important reaction product which seems to be formed via the cyclodimerization of two propargyl (C[subscript]3H[subscript]3•) radicals in the presence of metal ion. The pseudo-unimolecular rate constants, k[subscript] obs, of allyl derivatives with excess t-BuHgCl have been determined and the plot of log k[subscript] obs vs. [sigma][subscript] m gives a straight line with correlation coefficient of 0.994 and [rho] value of 3.24. Addition of t-Bu• to 1,3-butadiene epoxide in the presence of DABCO gives a 53% yield of t-BuCH[subscript]2CH=CHCHO with very high regio- and stereoselectivity. The reaction is thought to involve the loss of a proton from the intermediate t-BuCH[subscript]2CH=CHCH[subscript]2O•, followed by electron transfer from the ketyl radical anion to t-BuHgCl

Performance Analysis of 3G Communication Network

In this project, third generation (3G) technologies research had been carried out to design and optimization conditions for 3G network. The 3G wireless mobile communication networks are growing at an ever faster rate, and this is likely to continue in the foreseeable future. Some services such as e-mail, web browsing etc allow the transition of the network from circuit switched to packet switched operation, resulting in increased overall network performance. Higher reliability, better coverage and services, higher capacity, mobility management, and wireless multimedia are all parts of the network performance. Throughput and spectral efficiency are fundamental parameters in capacity planning for 3G cellular network deployments. This project investigates also the downlink (DL) and uplink (UL) throughput and spectral efficiency performance of the standard Universal Mobile Telecommunications system (UMTS) system for different scenarios of user and different technologies. Power consumption comparison for different mobile technology is also discussed. The analysis can significantly help system engineers to obtain crucial performance characteristics of 3G network. At the end of the paper, coverage area of 3G from one of the mobile network in Malaysia is presented

ATYPICAL ANTI-PSYCHOTICS IN ADULT BIPOLAR DISORDER: URRENT EVIDENCE AND UPDATES IN THE NICE GUIDELINES

Background: The introduction of atypical antipsychotics in the management of adult bipolar disorder has been increasingly adopted in clinical setting. While new studies continue to emerge, NICE has recently updated the guidelines on the assessment and management of bipolar disorder. Aim: To review the efficacy and tolerability profiles of atypical antipsychotics used to treat adult bipolar disorder in clinical practice, in relation to the latest NICE guidelines. Methods: The recent NICE guidelines (CG185), published in September 2014 was analysed to identify second generation antipsychotics (SGA) for the various presentations of bipolar disorder in adults. A qualitative literature search was conducted to review the evidence to support these changes, and identify randomized controlled trials on off-label and newer SGAs. Results and conclusions: With respect to atypical antipsychotics, NICE guidelines introduced olanzapine and fluoxetine combination therapy as first line treatment for moderate to severe bipolar depression; and improved clarity on the treatment of mania, hypomania and rapid cycling bipolar disorder. Evidence from our literature search favour these changes; and recognized other atypical antipsychotics such as aripiprazole, asenapine, lurasidone, ziprasidone and clozapine which could be of potential clinical benefit