247 research outputs found
On a Lie-theoretic Approach to Generalized Doubly Stochastic Matrices and Applications
No full textIn this article, we study generalized doubly stochastic matrices using the theory of Lie groups and Lie algebras. Applications to the inverse eigenvalue problem for symmetric doubly stochastic matrices are presented.ATIYAH M, 1982, B LOND MATH SOC, V23, P1; ATIYAH MF, 1983, P EDINBURGH MATH SOC, V26, P121; Audin M, 1991, TOPOLOGY TORUS ACTIO; BAUERLE GG, 1990, FINITE INFINITE DIME; BRUALDI RA, 1988, LINEAR ALGEBRA APPL, V107, P77, DOI 10.1016-0024-3795(88)90239-X; BRUALDI RA, 1991, ENCY MATH; CRUSE AB, 1975, DISCRETE MATH, V13, P109, DOI 10.1016-0012-365X(75)90012-6; GIBSON PM, 1980, LINEAR ALGEBRA APPL, V30, P101, DOI 10.1016-0024-3795(80)90185-8; GOURDIN M, 1982, BASICS LIE GROUPS; Helgason S., 1984, GROUPS GEOMETRIC ANA; JOHNSEN EC, 1971, LINEAR ALGEBRA APPL, V4, P225; Johnson C., 1981, LINEAR MULTILINEAR A, V10, P113, DOI 10.1080-03081088108817402; Katz M, 1970, J COMB THEORY, V8, P417, DOI 10.1016-S0021-9800(70)80034-5; Kirillov A.A., 1976, ELEMENTS THEORY REPR; Kostant B., 1973, ANN SCI ECOLE NORM S, p[6, 413]; Minc H., 1988, NONNEGATIVE MATRICES; MOURAD BH, 1998, THESIS U NEW S WALES; Perfect H., 1965, MONATSH MATH, V69, P35, DOI 10.1007-BF01313442; SINKHORN R, 1962, NOT AM MATH SOC, V9, P334; Soules G., 1983, LINEAR MULTILINEAR A, V13, P241, DOI 10.1080-03081088308817523; Tam T.Y., 1997, LINEAR MULTILINEAR A, V43, P87, DOI 10.1080-030810897088185188101
The contemporary zejel in Morocco : ُمَو ْي را َط ْTram by Mourad Kadiri, the popular poet of Salé
No full textMourad Kadiri pertenece a la segunda generación de poetas populares marroquíes contemporáneos que cultivan el zéjel. En este trabajo, presentamos su último diván, طْرَامُوَيْْ Tranvía, a través de su estética formal y su lengua. El artículo está estructurado así: 0. Introducción. 1. El autor. 2. Los poetas populares contemporáneos. 3. El zéjel y su lengua de expresión. 3.1. Rasgos lingüísticos. 4. La estética de Mourad Kadiri en Tranvía. 4.1. Figuras literarias.Mourad Kadiri belongs to the second generation of contemporary Moroccan popular poets who cultivate the zejel. In this work, we present his latest divan, طْرَامُوَيْْ Tramway, through his formal aesthetics and his language. The article is structured as follows: 0. Introduction. 1. The author. 2. Contemporary popular poets. 3. The zejel and its language of expression. 3.1. Linguistic features 4. The aesthetics of Mourad Kadiri in Tramway. 4.1. Literary figures
Governance in the MENA region: The hidden engine of economic growth
No full textThis study investigates the impact of governance on economic growth by analyzing data from 18 Middle East and North Africa (MENA) countries over the period from 2000 to 2023. Using Generalized Least Squares (GLS) estimation, the research explores the interdependent relationship between various dimensions of governance and economic performance. To verify the robustness of the results, the study further employs the Generalized Method of Moments (GMM) and utilizes an alternative proxy for economic growth. The findings indicate that corruption has a detrimental effect on economic growth in the MENA region. Additionally, higher levels of government effectiveness are associated with enhanced economic performance, while weaker voice and accountability are linked to slower growth. Interestingly, political stability exhibits a dual relationship: it is negatively associated with the Human Development Index but positively correlated with real GDP per capita. These outcomes remain consistent across robustness checks using different estimation techniques. The study offers practical insights for policymakers, emphasizing the importance of strengthening institutional frameworks and promoting transparency and accountability to foster sustainable economic growth in the MENA region
Causality and dynamic relationships between exchange rate and stock market indices in BRICS countries Panel/GMM and ARDL analyses
No full textPurpose: This paper aims to investigate simultaneously the causality and the dynamic links between exchange rates and stock market indices. It attempts to identify the short- and long-term effect of the US dollar on major stock market indices of Brazil, Russia, India, China and South-Africa (BRICS) nations. Design/methodology/approach: This paper applies a new methodology combining the panel generalized method of moments model and the panel auto-regressive distributed lag (ARDL) method to investigate the existence of a causal short-/long-run relationships and dynamic dependence among all stock market returns and exchanges rates changes of BRICS countries. Findings: Results show that exchange rate changes have a significant effect on the past and the current volatility of the BRICS stock indices. Besides, ARDL estimations reveal that exchange rate movements have a significant effect on short- and long-term stocks market indices of all BRICS countries. Originality/value: The findings have implications for policymakers and market participants who try to manage the exchange rate will have a different dose of intervention if they know that the effects of currency depreciation are different than appreciation. These results have important implications that investors should take into account in frequency-varying exchange rates and stock returns and regulators should consider developing sound policy measures to prevent financial risk.Propósito: Este artículo tiene como objetivo investigar simultáneamente la causalidad y los vínculos dinámicos entre los tipos de cambio y los índices bursátiles. Intenta identificar el efecto a corto y largo plazo del dólar estadounidense en los principales índices bursátiles de Brasil, Rusia, India, China y Sudáfrica (BRICS). Diseño/metodología/enfoque: Este artículo aplica una nueva metodología que combina el modelo del método generalizado de momentos de panel y el método autorregresivo de retardo distribuido (ARDL) de panel para investigar la existencia de relaciones causales de corto/largo plazo y de dependencia dinámica entre todos los rendimientos del mercado de valores y cambios en los tipos de cambio de los países BRICS. Hallazgos: Los resultados muestran que los cambios en los tipos de cambio tienen un efecto significativo en la volatilidad pasada y actual de los índices bursátiles BRICS. Además, las estimaciones de ARDL revelan que los movimientos de los tipos de cambio tienen un efecto significativo en los índices bursátiles de corto y largo plazo de todos los países BRICS. Originalidad/valor: Los hallazgos tienen implicaciones para los formuladores de políticas y los participantes del mercado que intentan administrar el tipo de cambio tendrán una dosis diferente de intervención si saben que los efectos de la depreciación de la moneda son diferentes a los de la apreciación. Estos resultados tienen implicaciones importantes que los inversores deberían tener en cuenta en las variaciones de frecuencia de los tipos de cambio y los rendimientos de las acciones, y los reguladores deberían considerar el desarrollo de medidas políticas sólidas para prevenir el riesgo financiero
Minumally invasive videi-assisted thyroidectomy: multinstitutional experience
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Minimally invasive video-assisted thyroidectomy: Multiinstitutional experience
Author(s): Miccoli, P (Miccoli, P); Bellantone, R (Bellantone, R); Mourad, M (Mourad, M); Walz, M (Walz, M); Raffaelli, M (Raffaelli, M); Berti, P (Berti, P)
Source: WORLD JOURNAL OF SURGERY Volume: 26 Issue: 8 Pages: 972-975 DOI: 10.1007/s00268-002-6627-7 Published: AUG 2002
Times Cited: 88 (from Web of Science)
Cited References: 10 [ view related records ] Citation MapCitation Map
Conference: International Surgical Week Conference Location: BRUSSELS, BELGIUM Date: AUG 26-30, 2001
Abstract: Minimally invasive video-assisted thyroidectomy (MINAT) was described in 1998. In this study we collected the experience of four third-level referral centers that adopted this technique. A total of 336 patients (279 females, 57 males) were selected for MINAT. Selection criteria were thyroid volume < 15 ml, nodules not exceeding 3.5 cm of diameter, and an absence of thyroiditis, previous neck surgery, or previous irradiation. The procedure, totally gasless, is carried out through a 15 rum central incision above the sternal notch. Dissection is performed under endoscopic vision using conventional and endoscopic instruments. The mean operating time was 69.4 +/- 30.6 minutes for lobectomy (range 20-150 minutes) and 87.4 +/- 43.5 minutes for total thyroidectomy (range 30-220 minutes). The mean postoperative stay was 1.9 +/- 0.8 days. Postoperative complications were 7 transient and I definitive recurrent nerve palsies and 11 cases of hypoparathyroidism (9 transient, 2 definitive). Conversion to open surgery was necessary in 15 patients (4.5%). This study confirms in a large number of cases the safety and feasibility of MINAT, even in different surgical settings where similar results were achieved. The complication rate was not different from that of standard thyroidectomy. Although the operating time appears longer than with conventional procedures, the learning curve demonstrates a sharp decrease with increasing experience and the introduction of new technologies. The number of patients eligible for this approach remains low, thereby limiting its use, but it should be considered a valid option in selected surgical centers, offering some advantages to patients in terms of cosmetic results and postoperative distress
Causality and dynamic relationships between exchange rate and stock market indices in BRICS countries Panel/GMM and ARDL analyses
No full textPurpose: This paper aims to investigate simultaneously the causality and the dynamic links between exchange rates and stock market indices. It attempts to identify the short- and long-term effect of the US dollar on major stock market indices of Brazil, Russia, India, China and South-Africa (BRICS) nations.
Design/methodology/approach: This paper applies a new methodology combining the panel generalized method of moments model and the panel auto-regressive distributed lag (ARDL) method to investigate the existence of a causal short-/long-run relationships and dynamic dependence among all stock market returns and exchanges rates changes of BRICS countries.
Findings: Results show that exchange rate changes have a significant effect on the past and the current volatility of the BRICS stock indices. Besides, ARDL estimations reveal that exchange rate movements have a significant effect on short- and long-term stocks market indices of all BRICS countries
Originality/value: The findings have implications for policymakers and market participants who try to manage the exchange rate will have a different dose of intervention if they know that the effects of currency depreciation are different than appreciation. These results have important implications that investors should take into account in frequency-varying exchange rates and stock returns and regulators should consider developing sound policy measures to prevent financial risk.
Doi: https://doi.org/10.1108/JEFAS-04-2019-005
Mourad Farag and His Book, The Karaites and the Rabbanites
No full textThe modern history of Karaism and Karaites is one of the most neglected corners in the whole field of Jewish and Near Eastern studies. Particularly in the 20th century, unrecorded history is bound to become permanently lost history, an eventuality surely to be regretted.
The present paper attempts to rescue from oblivion a recent member of the Cairene Karaite community. Mourad Farag (1867-1955), born in a family of goldsmiths, became a successful attorney at law, but devoted much of his leisure to Jewish studies and became a self-taught scholar in this field. He published a long series of works in Hebrew grammar, comparative Hebrew and Arabic philol¬ ogy, Karaite law, Biblical exegesis, and kindred subjects, as well as copious Arabic and Hebrew poetry. The paper examines in particular detail his work entitled The Karaites and the Rabbanites, in which he goes into great detail in examining the differences between the two camps, as well as the history of the Karaites and their literary activity. His intention throughout is to avoid intolerance and recriminations and to promote mutual understanding, and he is equally opposed to extremism on either the Karaite or the Rabbanite side. If occasionally he bases his conclusions on insufficient evi¬ dence, this is probably due to his lack of access to, or inability to read fluently, the pertinent Rabbanite sources in the original. On the other hand, in some aspects, for example in his concern for the rights of women, he is clearly under the influence of modern Western thought. An important product of modern Karaite literature ; neither work nor author should be permitted to lapse into oblivion.Nemoy Leon. Mourad Farag and His Book, The Karaites and the Rabbanites. In: Revue des études juives, tome 135, n°1-3, janvier-septembre 1976. pp. 87-112
Concepts and Constructs of Urban Sensing
No full textThere is an increasing practice of combining various sorts of data from the city to obtain a comprehensive operating picture for urban managers. The sorts of data being combined includes administrative data, sensor and transactional data, and social media data. In order for these practices to fulfil their full promises it is important that practitioners build systems which measure the correct things. It is also important that theorists develop systematic explanations for complex urban phenomena. This paper confronts the challenges of building better concepts and constructs for urban data analysis and sensing.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Policy Analysi
The impact of macroeconomic and conventional stock market variables on Islamic index returns under regime switching
No full textAbstractThe objective of this paper is to study the impact of conventional stock market return and volatility and various macroeconomic variables (including inflation rate, short-term interest rate, the slope of the yield curve and money supply) on Islamic stock markets returns for twenty developed and emerging markets using Markov switching regression models. The empirical results for the period 2002–2014 show that both developed and emerging Islamic stock indices are influenced by conventional stock indices returns and money supply for both the low and high volatility regimes. However, the other macroeconomic variables fail to explain the dynamics of Islamic stock indices especially in the high volatility regime. Similar conclusions are obtained by using the MS-VAR model
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