A formulation without partial wave decomposition for scattering of spin-1/2 and spin-0 particles

A new technique has been developed to calculate scattering of spin-1/2 and spin-0 particles. The so called momentum-helicity basis states are constructed from the helicity and the momentum states, which are not expanded in the angular momentum states. Thus, all angular momentum states are taken into account. Compared with the partial-wave approach this technique will then give more benefit especially in calculations for higher energies. Taking as input a simple spin-orbit potential, the Lippman-Schwinger equations for the T-matrix elements are solved and some observables are calculated.Comment: 4 pages, 1 figur

IRAN AND ISRAEL’S NATIONAL SECURITY IN THE AFTERMATH OF 2003 REGIME CHANGE IN IRAQ

Abstract Following the US-led invasion of Iraq in 2003, Iran has continued to pose a serious security threat to Israel. The US initially occupied Iraq, ultimately overthrowing Saddam Hussein’s regime, in the belief that it would be able to replace that government with a pro-American administration which would counteract the threat from Iran. Instead, the balance of power in the Gulf region was radically altered and Iran, which saw Iraq as its first line of defence against the increasing threat from Israel, sought ways to prevent the US from taking control of Iraq. This failure by the US to stabilise Iraq paved the way for Iran to expand its influence over the region and altered the ‘balance of threat’ making it an actual threat to Israeli national security. This led Iran, as part of its deterrence and forward-deployment strategy, to initiate a cold war with Israel by accelerating its nuclear programme and its support, both financial and military, of Hezbollah In order to explain any changes to Israel’s stance on security since the 2003 invasion of Iraq, this study examines that country’s national security policy since the invasion, looking at the perceived threat from Iran, in the form of its nuclear capabilities, and its forward defence strategy. This study suggests that the US was so focussed on implementing regime change in Iraq, in the belief that this would instigate the introduction of democracy to the region, that it failed to foresee the wider geopolitical implications of the power vacuum which would occur. The result was that the way was left clear for Iran to exercise its influence over the region and to alter the balance of threat against Israel. This study argues that, in order to better understand Israel’s new security status, it is essential to explore the Iranian threat, which is characterised by its development of nuclear capabilities and the forward defence structure which can be seen in Tehran’s alliance with Syria and Hezbolla

A rare cardiac cause of hoarseness of voice

To The Editor: Hoarseness of voice caused by the damage of the recurrent laryngeal nerve as a result of cardiac causes is known as Ortner’s or cardio-vocal syndrome. This syndrome was described by Nobert Ortner, an Austrian physician, in 1897 [1]. Initially it wasthought to be due to the enlargement of the left atrium as a result of severe mitral stenosis in rheumatic heart disease. However, it wasfound, later, to be caused by other conditions rather than rheumatic heart disease. The accepted mechanism of this syndrome is thecompression of the recurrent laryngeal nerve from the enlargement of the pulmonary artery in the window area between the aorta andligamentum arteiosum. This condition was quite common at the beginning of last century due to a high incidence of untreated rheumatic heart disease. Although,it is very rare to see itnowadays, it still poses a treatment challenge. We would like to share our experience in diagnosing and treating a patient with Ortner’s syndrome caused by severe mitral valve prolapse. To the best of our knowledge Ortner’s caused by mitral valve prolapse hasbeen reported only once

Jordan ?-Centralizers of Prime and Semiprime Rings

The purpose of this paper is to prove the following result: Let R be a 2-torsion free ring and T: R?R an additive mapping such that T is left (right) Jordan ?-centralizers on R. Then T is a left (right) ?-centralizer of R, if one of the following conditions hold (i) R is a semiprime ring has a commutator which is not a zero divisor . (ii) R is a non commutative prime ring . (iii) R is a commutative semiprime ring, where ? be surjective endomorphism of R . It is also proved that if T(x?y)=T(x)??(y)=?(x)?T(y) for all x, y ? R and ?-centralizers of R coincide under same condition and ?(Z(R)) = Z(R)

New journal: Applied Water Science

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Ranking users and information in online social networks

Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.Includes bibliographical references (leaf 39).The goal of this project is to explore the design and implementation of SocialRank. SocialRank is a personalized ranking algorithm that provides--for each user--ratings for people in his online social network. Subsequently, these ratings are used to rank incoming information received by the user from those in his social network. We analyze the use of actions on online social networks as proxies for measuring the strength of relationships between users and introduce an action scoring mechanism that uses different factors to evaluate an action's significance. We implement SocialRank in a generic online social network that we build as part of this research project and explore the effectiveness and usefulness of SocialRank.by Abdulrahman I. Tarbzouni.M.Eng

Using Deep Learning Networks to Predict Telecom Company Customer Satisfaction Based on Arabic Tweets

Information systems are transforming businesses, which are using modern technologies towards new business models based on digital solutions, which ultimately lead to the design of novel socio-economic systems. Sentiment analysis is, in this context, a thriving research area. This paper is a case study of Saudi telecommunications (telecom) companies, using sentiment analysis for customer satisfaction based on a corpus of Arabic tweets. This paper compares, for the first time for Saudi social media in telecommunication, the most popular machine learning approach, support vector machine (SVM), with two deep learning approaches: long short-term memory (LSTM) and gated recurrent unit (GRU). This study used LSTM and GRU with two different implementations, adding attention mechanism and character encoding. The study concluded that the bidirectional-GRU with attention mechanism achieved a better performance in the telecommunication domain and allowed detection of customer satisfaction in the telecommunication domain with high accuracy

Morphometric Observations of the tongue of the domestic duck (Anas platyrhynchos domestica).

A Biometric study was conducted on the tongue of twenty-five (25) adult domestic duck collected from the Sokoto metropolitan poultry and fish modern market, over a period of seven days . A pair of scissors, a scalpel and a blade was used to incise, excise, separate or debride various parts of the oral cavity to expose the organ for research. Results showed that the tongue is characterized by an elongated triangular format. At a point, approximately 2/3 the length of the lingual corpus there is a distinct depression, separating the caudal one-third of the lingual corpus from its rostral two-third. On the dorsal surface of the apex and body of the tongue, a median groove is found. A unique feature of the tongue in domestic Duck is the presence of many fine overlapping needle-shaped processes at both lateral sides of the caudal lingual apex. A single row of large conical papillae is observed symmetrically in the marginal region between the body and root of the tongue. Biometrically the mean dimensio