Results for "Ahmed Errahmani"

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The cosmology of an holographic induced gravity model with curvature effectsApr 06 2011Sep 19 2011We present an holographic model of the Dvali-Gabadadze-Porrati scenario with a Gauss-Bonnet term in the bulk. We concentrate on the solution that generalises the normal Dvali-Gabadadze-Porrati branch. It is well known that this branch cannot describe ... More
The holographic induced gravity model with a Ricci dark energy: smoothing the little rip and big rip through Gauss-Bonnet effects?Dec 26 2011Mar 09 2012We present an holographic brane-world model of the Dvali-Gabadadze-Porrati (DGP) scenario with and without a Gauss-Bonnet term (GB) in the bulk. We show that an holographic dark energy component with the Ricci scale as the infra-red cutoff can describe ... More
Induced gravity effect on inflationary parameters in an holographic cosmologyApr 12 2019We investigate observational constraints on inflationary parameters in the context of an holographic cosmology with an induced gravity correction. We consider two situations where a universe is firstly filled with a scalar field and secondly with a tachyon ... More
The holographic Ricci dark energy and its possible doomsdaysJan 31 2013It is well known that the holographic Ricci dark energy can induce some future doomsdays in the evolution of the universe. Here we analyse the possible avoidance of those doomsdays by invoking a modification to general relativity on the form of curvature ... More
Constraints on tachyon inflationary models with an AdS/CFT correspondenceOct 06 2016In order to study the effect of the anti de Sitter/ conformal field theory correspondence (AdS/CFT) on the primordial inflationary era, we consider a universe filled with a tachyon field in a slow-roll regime. In this context, the background and perturbative ... More
Constraints on tachyon inflationary models with an AdS/CFT correspondenceOct 06 2016Nov 14 2016In order to study the effect of the anti de Sitter/ conformal field theory correspondence (AdS/CFT) on the primordial inflationary era, we consider a universe filled with a tachyon field in a slow-roll regime. In this context, the background and perturbative ... More
The little sibling of the big rip singularityJul 09 2014Jun 24 2015We present a new cosmological event, which we named the little sibling of the big rip. This event is much smoother than the big rip singularity. When the little sibling of the big rip is reached, the Hubble rate and the scale factor blow up but the cosmic ... More
A New Approach to Decoding of Rational Irreducible Goppa codeMay 05 2013Mar 08 2014The interesting properties of classical Goppa code and its effective decoding algorithm (algorithm of patterson) make the most appropriate candidate for use in the MC Eliece cryptosystem. Information leakage which results from the relationship between ... More
Strength and Weakness in Grover's Quantum Search AlgorithmNov 27 2008Grover's quantum search algorithm is considered as one of the milestone in the field of quantum computing. The algorithm can search for a single match in a database with $N$ records in $O(\sqrt{N})$ assuming that the item must exist in the database with ... More
Synthesis and Optimization of Reversible Circuits for Homogeneous Boolean FunctionsOct 02 2007Homogenous Boolean function is an essential part of any cryptographic system. The ability to construct an optimized reversible circuits for homogeneous Boolean functions might arise the possibility of building cryptographic system on novel computing paradigms ... More
AI 3D Cybug GamingSep 10 2010In this short paper I briefly discuss 3D war Game based on artificial intelligence concepts called AI WAR. Going in to the details, I present the importance of CAICL language and how this language is used in AI WAR. Moreover I also present a designed ... More
Designing Flexible GUI to Increase the Acceptance Rate of Product Data Management Systems in IndustryMar 06 2011Product Data Management (PDM) desktop and web based systems maintain the organizational technical and managerial data to increase the quality of products by improving the processes of development, business process flows, change management, product structure ... More
PDM based I-SOAS Data Warehouse DesignAug 07 2010This research paper briefly describes the industrial contributions of Product Data Management in any organization's technical and managerial data management. Then focusing on some current major PDM based problems i.e. Static and Unintelligent Search, ... More
The Pseudo Radiation Energy Amplifier (PREA) and the mean earth s ground temperatureNov 03 2008From the radiation balance diagram illustrating the IPCC reports one can estimate the power received by Earth from the sun at Pin = 342 W/m2 and the power consumed, remitted and reflected by the earth and its atmosphere at Pout = 599 kW/m2. It seems that ... More
Radio Frequency Identifiers: What are the Possibilities?May 27 2010This paper defines the components of radio frequency identifiers (RFID). It also explores the different areas and sectors where RFID can be beneficial. The paper discusses the uses and advantages of RFID in deference, consumer packaged goods (CPG), healthcare, ... More
Bound state eigenfunctions need to vanish faster than $|x|^{-3/2}$May 19 2016Jun 03 2016In quantum mechanics students are taught to practice that eigenfunction of a physical bound state must be continuous and vanishing asymptotically so that it is normalizable in $x\in (-\infty, \infty)$. Here we caution that such states may also give rise ... More
Proof of the Aubert-Baum-Plymen-Solleveld conjecture for split classical groupsApr 14 2016In this paper we prove the Aubert-Baum-Plymen-Solleveld conjecture for the split classical groups and establish the connection with the Langlands correspondence. To do this, we review the notion of cuspidality for enhanced Langlands parameters and also ... More
A Fast Quantum Algorithm for the Affine Boolean Function IdentificationJul 23 2014Jan 30 2015Bernstein-Vazirani algorithm (the one-query algorithm) can identify a completely specified linear Boolean function using a single query to the oracle with certainty. The first aim of the paper is to show that if the provided Boolean function is affine, ... More
Non-unitarity and non-reciprocity in scattering from real potentials in presence of confined non-linearityDec 11 2013Investigations of scattering in presence of non-linearity which have just begun require the confinement of both the potential, $V(x)$, and the non-linearity, $\gamma f(|\psi|)$. There could be two options for the confinement. One is the finite support ... More
Centre de Bernstein enrichi pour les groupes classiquesNov 08 2015In this article, we consider the links between parabolic induction and the local Langlands correspondence. We enunciate a conjecture about the (enhanced) Langlands parameters of supercuspidal representation of split reductives $p$-adics groups. We are ... More
Selmer groups and anticyclotomic $\mathbb{Z}_p$-extensionsNov 17 2014Jan 26 2015Let $E/\mathbb{Q}$ be an elliptic curve, $p$ a prime and $K_{\infty}/K$ the anticyclotomic $\mathbb{Z}_p$-extension of a quadratic imaginary field $K$ satisfying the Heegner hypothesis. In this paper we give a new proof to a theorem of Bertolini which ... More
Lexical Normalisation of Twitter DataSep 16 2014Sep 20 2015Twitter with over 500 million users globally, generates over 100,000 tweets per minute . The 140 character limit per tweet, perhaps unintentionally, encourages users to use shorthand notations and to strip spellings to their bare minimum "syllables" or ... More
A minimum principle for plurisubharmonic functionsJan 03 2007The main goal of this work is to give new and precise generalizations to various classes of plurisubharmonic functions of the classical minimum modulus principle for holomorphic functions of one complex variable, in the spirit of the famous lemma of Cartan-Boutroux. ... More
The next nearest neighbor effect on the 2D materials propertiesNov 01 2011In this work, the effect of introducing next nearest neighbor (NNN) hopping to the 2D materials was studied using the graphene 2D honeycomb two sublattice as an example. It is found that introducing NNN to the 2D materials removes the symmetry around ... More
Understanding of hopping matrix for 2D materials taking 2D honeycomb and square lattices as study casesOct 29 2011In this work, a trial understanding for the physics underling the construction of exchange (hopping) matrix $\mathbf{E}$ in Heisenberg model (tight binding model) for 2D materials is done. It is found that the $\mathbf{E}$ matrix describes the particles ... More
Cylindrical symmetry, non-rotating and non-static or static black hole solution and the naked singularitiesApr 08 2019In this work, a four-dimensional cylindrical symmetry and nonstatic or static space-times in the backgrounds of anti-de Sitter (AdS) space with perfect stiff fluid, anisotropic fluid as the stress-energy tensor, is presented. For suitable parameter conditions ... More
Comparison of Self-monitoring Feedback Data from Electronic Food and Nutrition Tracking ToolsApr 17 2019Changing dietary habits and keeping food diary encourages fewer calorie consumption, and thus weight loss. Studies have shown that people who keep food diary are more successful in losing weight and keeping it off. However, no study has investigated the ... More
Ricci-Gauss-Bonnet Holographic Dark Energy in Chern-Simons Modified GravityJan 11 2019We discuss the recently suggested Ricci-Gauss-Bonnet holographic dark energy in Chern-Simons modified gravity. To reach a deterministic solution, some general forms of the scale factor have been tested and two physically reasonable forms have been used: ... More
Data-Free/Data-Sparse Softmax Parameter Estimation with Structured Class GeometriesJun 03 2018Jul 22 2018This note considers softmax parameter estimation when little/no labeled training data is available, but a priori information about the relative geometry of class label log-odds boundaries is available. It is shown that `data-free' softmax model synthesis ... More
Blind Deconvolution using Modulated InputsNov 20 2018This paper considers the blind deconvolution of multiple modulated signals/filters, and an arbitrary filter/signal. Multiple inputs $\boldsymbol{s}_1, \boldsymbol{s}_2, \ldots, \boldsymbol{s}_N =: [\boldsymbol{s}_n]$ are modulated (pointwise multiplied) ... More
Tetraquark interpretation of $e^+ e^- \to Υπ^+π^-$ Belle data and $e^+ e^- \to b \bar{b}$ BaBar dataJan 04 2011We summarize the main features of the spectroscopy, production and decays of the $J^{PC}=1^{--}$ tetraquarks in the $b\bar{b}$ sector, concentrating on the lowest state called $Y_b(10890)$. The tetraquark framework is used to analyze the BaBar data on ... More
Review of Heavy Quark Physics - theoryDec 09 2004Recent progress in the theory of B-meson decays is reviewed with emphasis on the aspects related to the B-factory data.
Constant-Time Quantum Algorithm For The Unstructured Search ProblemNov 26 2008Given an item and a list of values of size $N$. It is required to decide if such item exists in the list. Classical computer can search for the item in O(N). The best known quantum algorithm can do the job in $O(\sqrt{N})$. In this paper, a quantum algorithm ... More
Detection and Elimination of Non-Trivial Reversible IdentitiesJan 23 2011Non-Trivial Reversible Identities (NTRIs) are reversible circuits that have equal inputs and outputs. NTRIs cannot be detected using optimization algorithms in the literature. Existence of NTRIs in a circuit will cause a slow down by increasing the number ... More
Transmission through a non-overlapping well adjacent to a finite barrierSep 27 2011We point out that a non-overlapping well (at negative energies) adjacent to a finite barrier (at positive energies) is a simple potential which is generally missed out while discussing the one-dimensional potentials in the textbooks of quantum mechanics. ... More
C, PT, and CPT invariance of pseudo-Hermitian HamiltoniansFeb 19 2003We propose construction of a unique and definite metric ($\eta_+$), time-reversal operator (T) and an inner product such that the pseudo-Hermitian matrix Hamiltonians are C, PT, and CPT invariant and PT(CPT)-norm is indefinite (definite). Here, P and ... More
Pseudo-Hermiticity of Hamiltonians under imaginary shift of the co-ordinate : real spectrum of complex potentialsAug 03 2001Aug 10 2001We propose that the real spectrum and the orthogonality of the states for several known complex potentials of both types, PT-symmetric and non-PT-symmetric can be understood in terms of currently proposed $\eta$-pseudo-Hermiticity (Mostafazadeh, quant-ph/0107001) ... More
A note on Coulomb scattering amplitudeOct 03 2003The summation of the partial wave series for Coulomb scattering amplitude, $f^C(\theta)$ is avoided because the series is oscillatorily and divergent. Instead, $f^C(\theta)$ is obtained by solving the Schr{\"o}dinger equation in parabolic cylindrical ... More
P,T,PT, and CPT invariance of Hermitian HamiltoniansFeb 11 2003Feb 26 2003Currently, it has been claimed that certain Hermitian Hamiltonians have parity (P) and they are PT-invariant. We propose generalized definitions of time-reversal operator (T) and orthonormality such that all Hermitian Hamiltonians are P, T, PT, and CPT ... More
Origin of the numerals, Zero conceptJul 24 2007The partisans of the hypothesis of the Indian origin of the numerals create confusion between the history of the Indian mathematics and the history of our modern numerals. To argue the thesis of the Indian origin of the numbers they confound between: ... More
Magnetic AdS2 x R2 at Weak and Strong CouplingDec 20 2011Dec 21 2011We investigate an AdS2 magnetic brane solution within an abelian truncation of gauged supergravity in AdS4 x orbifolded S7. The solutions flow from AdS4 -> AdS2 x R2 with a magnetic field orthogonal to the R2 directions. We find a class of supersymmetric ... More
Holographic Projection Technology: The World is ChangingJun 04 2010This research papers examines the new technology of Holographic Projections. It highlights the importance and need of this technology and how it represents the new wave in the future of technology and communications, the different application of the technology, ... More
Reading a Single Qubit System Using Weak Measurement with Variable StrengthOct 23 2016Acquiring information about an unknown qubit in a superposition of two states is essential in any computation process. Quantum measurement, or sharp measurement, is usually used to read the information contents of that unknown qubit system. Quantum measurement ... More
Tau neutrino as a probe of nonstandard interactions via charged Higgs and $W'$ contributionSep 14 2013We discuss the impact of the presence of a charged Higgs and a $W'$ gauge boson on the tau-neutrino nucleon scattering $\nu_{\tau}+ N \rightarrow \tau^- + X$ and $\bar{\nu}_{\tau}+ N \rightarrow \tau^+ + X$. We show the effect of the new physics on the ... More
An Extension of Shelah's Trichotomy TheoremJun 27 2017Mar 27 2018In Sh506, Shelah develops the theory of $\mathrm{pcf}_I(A)$ without the assumption that $|A|<\min (A)$, going so far as to get generators for every $\lambda\in\mathrm{pcf}_I(A)$ under some assumptions on $I$. Our main theorem is that we can also generalize ... More
Ginzburg-Landau Type Approach to the 1+1 Gross Neveu Model - Beyond Lowest Non-Trivial OrderFeb 25 2018Mar 30 2018This paper presents a case study of the effects of increasing the order of a Ginzburg-Landau type expansion, by using the well known Gross-Neveu model in 1+1 dimensions as a test case. It is found that as the order of expansion increases, the predicted ... More
Analysis of Discrete Symmetries in b-Baryon DecaysJun 03 2011A study of the decay channels Lambda_{b}-->Lambda V, where V is a vector meson (1^-), has been done by putting together kinematical and dynamical analysis. An intensive use of the helicity formalism is involved on the kinematical side, while on the dynamical ... More
Interest-Aware Delivery for Mobile Social Networks: A TRACE-driven ApproachDec 16 2018We envision future mobile networks to be human-centric supporting interest-aware delivery, where an interest maybe based on behavior, such as mobility pattern, location, or web browsing (or user profile) such as affiliation, attributes, or activity. An ... More
Controller Design and Implementation of a New Quadrotor Manipulation SystemApr 11 2019The previously introduced aerial manipulation systems suffer from either limited end-effector DOF or small payload capacity. In this dissertation, a quadrotor with a 2-DOF manipulator is investigated that has a unique topology to enable the end-effector ... More
Temperature dependent quantum correlations in three dipolar coupled two-level atomsNov 18 2016We investigate the thermal entanglement characteristics of three dipole-coupled two-level atoms arranged in two different configurations - in a line with nearest neighbour coupling and in a closed loop with each atom interacting with both its neighbours. ... More
Calderón's reproducing formulas for the Weinstein $L^2$- multiplier operatorsJan 27 2018The aim of this work is the study of the Weinstein $L^2$- multiplier operators on $\mathbb{R}^{d+1}_+$ and we give for them Calder\'on's reproducing formulas and best approximation using the theory of Weinstein transform and reproducing kernels.
An Extension of Shelah's Trichotomy TheoremJun 27 2017Apr 04 2019In Sh506, Shelah develops the theory of $\mathrm{pcf}_I(A)$ without the assumption that $|A|<\min (A)$, going so far as to get generators for every $\lambda\in\mathrm{pcf}_I(A)$ under some assumptions on $I$. Our main theorem is that we can also generalize ... More
First Measurement of $Γ(D*+)$Aug 07 2001We present the first measurement of the D*+ width using 9/fb of e+e- data collected near the Upsilon(4S) resonance by the CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction method that takes advantage of the small vertical ... More
Ordered Counter-AbstractionMar 31 2012We introduce a new symbolic representation based on an original generalization of counter abstraction. Unlike classical counter abstraction (used in the analysis of parameterized systems with unordered or unstructured topologies) the new representation ... More
New features of scattering from a one-dimensional non-Hermitian (complex) potentialOct 20 2011Dec 21 2011For complex one-dimensional potentials, we propose the asymmetry of both reflectivity and transmitivity under time-reversal: $R(-k)\ne R(k)$ and $T(-k) \ne T(k)$, unless the potentials are real or PT-symmetric. For complex PT-symmetric scattering potentials, ... More
Intelligent Human Machine Interface Design for Advanced Product Life Cycle Management SystemsAug 07 2010Designing and implementing an intelligent and user friendly human machine interface for any kind of software or hardware oriented application is always be a challenging task for the designers and developers because it is very difficult to understand the ... More
Statistical Trading Using Target Oriented Trading AgentAug 07 2010In this article we briefly present our contributions toward Trading Agent Competition (TAC); an international forum for promotion of research into the trading agent problems. Moreover, we present some strategies proposed and used in the development of ... More
Zero width resonance (spectral singularity) in a complex PT-symmetric potentialAug 20 2009We show that the complex PT-Symmetric potential, $V(x)=-V_1 {sech}^2x + iV_2 {sech}x ~\tanh x, $, entails a single zero-width resonance (spectral singularity) when $V_1+|V_2|=4n^2+4n+{3\over 4}(n=1,2,3.., |V_2|>|V_1|+ {{sgn}(V_1) \over 4})$ and the positive ... More
An ansatz for the eigenstates in PT-symmetric quantum mechanicsAug 10 2006We suggest a general ansatz for the energy-eigenstates when a complex one-dimensional PT-symmetric potential possesses real discrete spectrum. Several interesting features of PT-symmetric quantum mechanics have been brought out using this ansatz.
Handedness of complex PT-symmetric potential barriersDec 18 2003Generally, when imaginary part of an optical potential is non-symmetric the reflectivity, $R(E)$, shows left/right handedness, further if it is not negative-definite the reflection and transmission, $T(E)$, coefficients become anomalous in some energy ... More
Database Manipulation on Quantum ComputersMay 29 2007Manipulating a database system on a quantum computer is an essential aim to benefit from the promising speed-up of quantum computers over classical computers in areas that take a vast amount of storage and processing time such as in databases. In this ... More
Origin of the numeralsJun 27 2006Jul 03 2006Through the pagination of an Arabian Algerian manuscript of the beginning of the 19th century, we rediscover the original shape, the "Ghubari" shape, of the numerals. Contrary to some assumptions, particularly those which claim that they are derived from ... More
The Great Season Climatic OscillationJan 24 2007Feb 12 2007The variations of water density and thermal conductivity of the oceans cold region waters according to their salinity lead to suggest an hypothesis of an oscillating climate between two extreme positions: a maximum of hot temperatures and a minimum of ... More
Scheduling and Power Allocation to Optimize Service and Queue-Waiting Times in Cognitive Radio UplinksJan 04 2016In this report, we study the packet delay as a QoS metric in CR systems. The packet delay includes the queue waiting time and the service time. In this work, we study the effect of both the scheduling and the power allocation algorithms on the delay performance ... More
Integer Quantum Hall Effect in GrapheneApr 24 2015We study the quantum Hall effect in a monolayer graphene by using an approach based on thermodynamical properties. This can be done by considering a system of Dirac particles in an electromagnetic field and taking into account of the edges effect as a ... More
Ahmed's Integral: the maiden solutionNov 19 2014Dec 01 2014In 2001-2002, I happened to have proposed a new definite integral in the American Mthematical Monthly (AMM),which later came to be known in my name (Ahmed). In the meantime, this integral has been mentioned in mathematical encyclopedias and dictionaries ... More
Infrared behavior and gauge artifacts in de Sitter spacetime: The photon fieldNov 16 2010Jul 14 2011We study the infrared (long distance) behavior of the free photon field in de Sitter spacetime. Using a two-parameter family of gauge fixing terms, we show that the infrared (IR) behavior of the two-point function is highly gauge-dependent and ranges ... More
Implication of the Fourth Generation Standard Model to the Lepton Polarization asymmetries in the $B\rightarrow K^{\ast}\ell^{+}\ell^{-}$ DecayAug 02 2012Aug 11 2012In this work we study the implication of the fourth generation standard model (SM4) to the single and double lepton polarization asymmetries in the $B\rightarrow K^{\ast}\ell^{+}\ell^{-}$, $(l=\mu,\tau)$ decay. To see the variation in the values of lepton ... More
Charged Higgs Observability in the s-channel Single top Production at LHCNov 20 2017Single top quark production through weak interactions is one of the important source of charged Higgs in the Minimal Supersymmetric Standard Model (MSSM). In the s-channel single top production having largest cross-section, a charged Higgs may appear ... More
Sources of Charged Higgs Pair Through Double or Triple Higgs Production in Two Higgs Doublet Model Type II at Linear CollidersFeb 23 2015Dec 05 2016The production of triple Higgs $(H^+H^-H^0)$, $(H^+H^-h^0)$ and pair wise charged Higgs boson $(H^+H^-)$ is studied in the context of future linear colliders within the Two-Higgs Doublet Model (2HDM) type II. The aim is to compare sources of charged Higgs ... More
Quasihomogeneous Polynomials with Isomorphic Milnor AlgebrasSep 29 2009Mar 24 2010In Theorem 5.2 we show that two quasihomogeneous polynomials $f$ and $g$ having isomorphic Milnor algebras are right-equivalent.
Heavy Higgs of the Twin Higgs ModelsNov 08 2017Feb 22 2018Twin Higgs models are the prime illustration of neutral naturalness, where the new particles of the twin sector, gauge singlets of the Standard Model (SM), ameliorate the little hierarchy problem. In this work, we analyse phenomenological implications ... More
Predictive Capacity of Meteorological Data - Will it rain tomorrowSep 16 2014With the availability of high precision digital sensors and cheap storage medium, it is not uncommon to find large amounts of data collected on almost all measurable attributes, both in nature and man-made habitats. Weather in particular has been an area ... More
Beyond Technical Motives: Perceived User Behavior in Abandoning Wearable Health & Wellness TrackersApr 16 2019Health trackers are widely adopted to support individuals with daily health and wellness activity tracking. They can help increase steps taken, enhance sleeping pattern, improve healthy diet, and promote the overall health. Despite the growth in wearable ... More
SpinWaves in Ferromagnetic Dots 2D Honeycomb Lattice StripesOct 26 2011In this work, the spin wave calculations were carried out using the Heisenberg Hamiltonian to study the allowed spin waves of zigzag and armchair edged stripes for ferromagnetic nanodots arrayed in a 2D honeycomb lattice \cite{Selim2011}. The Hamiltonian ... More
Weighted Homogeneous Polynomials with Isomorphic Milnor AlgebrasSep 29 2009Apr 06 2019We recall first some basic facts on weighted homogeneous functions and filtrations in the ring $A$ of formal power series. We introduce next their analogues for weighted homogeneous diffeomorphisms and vector fields. We show that the Milnor algebra is ... More
Homogeneous Polynomials with Isomorphic Milnor AlgebrasMay 25 2008In Theorem 3.2 we show that two homogeneous polynomials $f$ and $g$ having isomorphic Milnor algebras are right-equivalent.
Statistical Romberg extrapolation: A new variance reduction method and applications to option pricingFeb 23 2006We study the approximation of $\mathbb{E}f(X_T)$ by a Monte Carlo algorithm, where $X$ is the solution of a stochastic differential equation and $f$ is a given function. We introduce a new variance reduction method, which can be viewed as a statistical ... More
A Type D Non-Vacuum Spacetime with Causality Violating Curves, and its Physical InterpretationDec 04 2017We present a topologically trivial, non-vacuum solution of the Einstein's field equations in four-dimensions, which is regular everywhere. The metric admits circular closed timelike curves, which appear beyond the null curve, and these timelike curves ... More
BYOD, Personal Area Networks (PANs) and IOT: Threats to Patients PrivacyFeb 18 2019The passage of FISMA and HIPPA Acts have mandated various security controls that ensure the privacy of patients data. Hospitals and health-care organizations are required by law to ensure that patients data is stored and disseminated in a secure fashion. ... More
Rare B-Meson Decays at the CrossroadsJul 17 2016Experimental era of rare $B$-decays started with the measurement of $B \to K^* \gamma$ by CLEO in 1993, followed two years later by the measurement of the inclusive decay $B \to X_s \gamma$, which serves as the standard candle in this field. The frontier ... More
Theory Overview on SpectroscopyAug 10 2011A theoretical overview of the exotic spectroscopy in the charm and beauty quark sector is presented. These states are unexpected harvest from the $e^+e^-$ and hadron colliders and a permanent abode for the majority of them has yet to be found. We argue ... More
Rare Radiative $B$ Decays in the Standard ModelAug 21 1995A status report on the theory and phenomenology of rare radiative $B$ decays in the standard model is presented with emphasis on the measured decays $B \to X_s \gamma$ and $B \to K^* \gamma$. Standard model is in agreement with experiments though this ... More
Cooperative Cognitive Relaying with Ordered Cognitive Multiple AccessAug 28 2012We investigate a cognitive radio system with two secondary users who can cooperate with the primary user in relaying its packets to the primary receiver. In addition to its own queue, each secondary user has a queue to keep the primary packets that are ... More
All-Digital Self-interference Cancellation Technique for Full-duplex SystemsJun 20 2014Full-duplex systems are expected to double the spectral efficiency compared to conventional half-duplex systems if the self-interference signal can be significantly mitigated. Digital cancellation is one of the lowest complexity self-interference cancellation ... More
Optimal Selection of Spectrum Sensing Duration for an Energy Harvesting Cognitive RadioSep 25 2013In this paper, we consider a time-slotted cognitive radio (CR) setting with buffered and energy harvesting primary and CR users. At the beginning of each time slot, the CR user probabilistically chooses the spectrum sensing duration from a predefined ... More
Comments on "Optimal Utilization of a Cognitive Shared Channel with a Rechargeable Primary Source Node"Jan 14 2014In a recent paper [1], the authors investigated the maximum stable throughput region of a network composed of a rechargeable primary user and a secondary user plugged to a reliable power supply. The authors studied the cases of an infinite and a finite ... More
Reciprocity and unitarity in scattering from a non-Hermitian complex PT-symmetric potentialJul 30 2012Mar 01 2013In quantum scattering, Hermiticity is necessary for both reciprocity and unitarity. Reciprocity means that both reflectivity (R) and transmitivity (T) are insensitive to the direction of incidence of a wave (particle) at a scatterer from left/right. Unitarity ... More
A Middleware road towards Web (Grid) ServicesSep 21 2010Middleware technologies is a very big field, containing a strong already done research as well as the currently running research to confirm already done research's results and the to have some new solution by theoretical as well as the experimental (practical) ... More
Aero Fighter - 2D GamingSep 10 2010Designing and developing quality based computer game is always a challenging task for developers. In this paper I briefly discuss aero fighting war game based on simple 2D gaming concepts and developed in C & C++ programming languages, using old bitmapping ... More
Home AutomationSep 10 2010In this paper I briefly discuss the importance of home automation system. Going in to the details I briefly present a real time designed and implemented software and hardware oriented house automation research project, capable of automating house's electricity ... More
Towards Performance Measurement And Metrics Based Analysis of PLA ApplicationsJul 29 2010This article is about a measurement analysis based approach to help software practitioners in managing the additional level complexities and variabilities in software product line applications. The architecture of the proposed approach i.e. ZAC is designed ... More
Gaussian-random Ensembles of Pseudo-Hermitian MatricesJul 20 2004Attention has been brought to the possibility that statistical fluctuation properties of several complex spectra, or, well-known number sequences may display strong signatures that the Hamiltonian yielding them as eigenvalues is PT-symmetric (Pseudo-Hermitian). ... More
A practice problem for Schr{ö}dinger transmissionSep 24 2003We present the case of quantal transmission through a smooth, single-piece exponential potential, $V(x)=-V_0 e^{x/a}$, in contrast to the piece-wise continuous potentials, as a pedagogic model to demonstrate the analytic extraction of transmission (reflection) ... More
Eigenvalue problems for the complex PT-symmetric potential V(x)= igxSep 28 2006Nov 21 2006The spectrum of complex PT-symmetric potential, $V(x)=igx$, is known to be null. We enclose this potential in a hard-box: $V(|x| \ge 1) =\infty $ and in a soft-box: $V(|x|\ge 1)=0$. In the former case, we find real discrete spectrum and the exceptional ... More
Pseudo-reality and pseudo-adjointness of HamiltoniansJun 13 2003We define pseudo-reality and pseudo-adjointness of a Hamiltonian, $H$, as $\rho H \rho^{-1}=H^\ast$ and $\mu H \mu^{-1}=H^\prime$, respectively. We prove that the former yields the {\it necessary} condition for spectrum to be real whereas the latter helps ... More
The Great Season Climatic Oscillation and the Global WarmingAug 06 2008The present earth warming up is often explained by the atmosphere gas greenhouse effect. This explanation is in contradiction with the thermodynamics second law. The warming up by greenhouse effect is quite improbable. It is cloud reflection that gives ... More
Origin of the numerals, Al biruni testimonyJul 22 2007The origin of the numerals that we inherited from the arabo-Islamic civilization remained one enigma. The hypothesis of the Indian origin remained, with controversies, without serious rival. It was the dominant hypothesis since more of one century. Its ... More
PT-symmetry and TransparencyAug 06 2013Sep 25 2014It is known that the perfect absorption of two identical waves incident on a complex potential from left and right can occur at a fixed real energy and that the time-reversed setting of this system would act as a laser at threshold at the same energy. ... More
A Single Universal n-bit Gate for Reversible Circuit SynthesisJun 05 2013Many universal reversible libraries that contain more than one gate type have been proposed in the literature. Practical implementation of reversible circuits is much easier if a single gate type is used in the circuit construction. This paper proposes ... More