Three symmetry breakings in strong and radiative decays of strange heavy mesons

In this paper, we investigate three symmetry breaking effects in strong and radiative decays of strange heavy mesons. We study 1/m_Q corrections within the heavy quark effect theory, as well as SU(3) and SU(2) symmetry breakings induced by light quark mass differences and the \eta-\pi mixing vertex. These effects are studied in a covariant model. The numerical results show that the 1/m_Q corrections of the coupling constants are consistent with \alpha_s \Lambda_{QCD}/m_Q. The SU(3) symmetry violating effect of the strong coupling constant is obviously larger than that of the magnetic coupling constant. The value of the \eta-\pi mixing vertex has some changes because of the renewed data. As compared with the other theoretical calculations and the experimental data, our radiative decay rates are much larger than those of the other theoretical methods, except for \chiPT; however, our branching ratios are close to the experimental data.Comment: 26 pages, 9 figures; several changes made for further clarity; one figure and some references added; results and conclusions unchanged, version to appear in Eur. Phys. J. C. arXiv admin note: substantial text overlap with arXiv:1401.391

Strong and radiative decays of heavy mesons in a covariant model

In this paper, we investigate symmetry breaking effects in strong and radiative decays of heavy mesons. We study $1/m_Q$ corrections within the heavy quark effective theory. These effects are studied in a covariant model for heavy mesons. The numerical results are consistent with the experimental data and some other theoretical calculations. These provide a vote of confidence for the validity of this covariant model.Comment: 35 pages, 7 figures, minor modifications and some references added, accepted for publication in JHE

An Efficient Modified "Walk On Spheres" Algorithm for the Linearized Poisson-Boltzmann Equation

A discrete random walk method on grids was proposed and used to solve the linearized Poisson-Boltzmann equation (LPBE) \cite{Rammile}. Here, we present a new and efficient grid-free random walk method. Based on a modified `` Walk On Spheres" (WOS) algorithm \cite{Elepov-Mihailov1973} for the LPBE, this Monte Carlo algorithm uses a survival probability distribution function for the random walker in a continuous and free diffusion region. The new simulation method is illustrated by computing four analytically solvable problems. In all cases, excellent agreement is observed.Comment: 12 pages, 5 figure

Playing with music while shopping online : the effects of interactive music on consumer engagement and behavioral intention

The current study investigates the potential of applying interactive music to the design of e-commerce website in order to create more engaging consumer experience. Through a single-factor experiment with three conditions (the control condition without background music, the static background music condition, the interactive background music condition), behavioral and attitudinal data were collected via Google Analytics and a self-report questionnaire (N = 251). We found that consumers in the interactive music condition were more affectively engaged in the shopping task, regarding the website more novel due to its perceived vividness. This enhanced engagement led to more positive brand attitudes and perceptions and increased users’ behavioral intention to purchase. Additionally, three moderators were found crucial to predict the target audience profile for application of interactive music – existing attitudes of users toward online shopping, price and web features as purchase decision-making factors.Advertisin

Oxide TFTs for digital holography

Holographic display has been regarded as the ultimate goal of realistic display, for holographic display can express, in principle, all the depth cue, for example, motion parallax, accommodation, occlusion, and convergence. Analog hologram with photographic films show very realistic 3D images using white light. But electronic hologram with electronic SLM (spatial light modulator) show limited picture quality due to large pixel pitch. The required pixel pitch for holographic display with 30 degree viewing angle is about 1 micron meter. To accomplish ultra high resolution display, TFTs with no short channel effects at sub-micron channel length should be developed. Oxide TFTs can be a good candidate due to the absence of short channel effects, very simple device structure and versatile variation of process and channel structure. BCE structure has been known as the smallest TFT structure for oxide TFTs. High performance BCE oxide TFTs having sub-micron channel length have been developed for the backplane of 3um pitch SLM with 16K x 4K pixels for holographic display. Please click Additional Files below to see the full abstract

Ultra-low power radio transceiver for wireless sensor networks

The objective of this thesis is to present the design and implementation of ultra-low power radio transceivers at microwave frequencies, which are applicable to wireless sensor network (WSN) and, in particular, to the requirement of the Speckled Computing Consortium (or SpeckNet). This was achieved through quasi-MMIC prototypes and monolithic microwave integrated circuit (MMIC) with dc power consumption of less than 1mW and radio communication ranges operating at least one metre. A wireless sensor network is made up of widely distributed autonomous devices incorporating sensors to cooperatively monitor physical environments. There are different kinds of sensor network applications in which sensors perform a wide range of activities. Among these, a certain set of applications require that sensor nodes collect information about the physical environment. Each sensor node operates autonomously without a central node of control. However, there are many implementation challenges associated with sensor nodes. These nodes must consume extremely low power and must communicate with their neighbours at bit-rates in the order of hundreds of kilobits per second and potentially need to operate at high volumetric densities. Since the power constraint is the most challenging requirement, the radio transceiver must consume ultra-low power in order to prolong the limited battery capacity of a node. The radio transceiver must also be compact, less than 5×5 mm2, to achieve a target size for sensor node and operate over a range of at least one metre to allow communication between widely deployed nodes. Different transceiver topologies are discussed to choose the radio transceiver architecture with specifications that are required in this project. The conventional heterodyne and homodyne topologies are discussed to be unsuitable methods to achieve low power transceiver due to power hungry circuits and their high complexity. The super-regenerative transceiver is also discussed to be unsuitable method because it has a drawback of inherent frequency instability and its characteristics strongly depend on the performance of the super-regenerative oscillator. Instead, a more efficient method of modulation and demodulation such as on-off keying (OOK) is presented. Furthermore, design considerations are shown which can be used to achieve relatively large output voltages for small input powers using an OOK modulation system. This is important because transceiver does not require the use of additional circuits to increase gain or sensitivity and consequently it achieves lower power consumption in a sensor node. This thesis details the circuit design with both a commercial and in-house device technology with ultra-low dc power consumption while retaining adequate RF performance. It details the design of radio building blocks including amplifiers, oscillators, switches and detectors. Furthermore, the circuit integration is presented to achieve a compact transceiver and different circuit topologies to minimize dc power consumption are described. To achieve the sensitivity requirements of receiver, a detector design method with large output voltage is presented. The receiver is measured to have output voltages of 1mVp-p for input powers of -60dBm over a 1 metre operating range while consuming as much as 420μW. The first prototype combines all required blocks using an in-house GaAs MMIC process with commercial pseudomorphic high electron mobility transistor (PHEMT). The OOK radio transceiver successfully operates at the centre frequency of 10GHz for compact antenna and with ultra-low power consumption and shows an output power of -10.4dBm for the transmitter, an output voltage of 1mVp-p at an operating range of 1 metre for the receiver and a total power consumption of 840μW. Based on this prototype, an MMIC radio transceiver at the 24GHz band is also designed to further improve the performance and reduce the physical size with an advanced 50nm gate-length GaAs metamorphic high electron mobility transistor (MHEMT) device technology

Maintaining computer-based information systems using text-based intelligent systems techniques

In order to incorporate up-to-date quantitative and qualitative information, Computer- Based Information Systems (CBIS) must be able to extract data from unstructured, textual formats such as newspapers and magazines. The process of updating information in a CBIS currently requires large amounts of human effort analyzing and converting data from such sources into formats which information systems can work with. This paper suggests some methods by which the data needs of a CBIS can be handled semi-automatically (Employing both computers and humans) using text-based intelligent systems (TBIS) techniques

Enhancing menu-based executive information systems using a natural language-menu guide*

Ufe argue that current Executive Information Systems (BIS), with simple menu-based user interfaces, support an inadequate range of information needs because a menu base which is too large or changes too rapidly becomes prohibitively difficult to use. We consider an alternative approach to increase executives\u27 access to information bases by incorporating a series of component- specific Natural Language Interfaces (NLI) into the various components of the BIS (database, model base, etc.), and adding a Natural Language-Menu Guide (NLMG) to the traditional menu and graphics based executive information systems. The various NLI will allow users to get access to information bases without having to know information system structures or techniques. At the same time, the NLMG will help users to navigate more easily through large and changing menu bases. The larger, changing menu bases rendered usable by the NLMG can, in turn, offer more options, and options of a more timely nature. The use of a series of smaller, interrelated natural language processing systems, rather than one big NLP system, should also take fuller advantage of the limited nature of current NLP technology

Supervised learning-based collaborative filtering using market basket data for the cold-start problem

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