1,562 research outputs found
On the positive definite solutions of nonlinear matrix equation X+A⋆ X−δA=Q
No full textAbstractIn this paper we consider the positive definite solutions of nonlinear matrix equation X+A⋆X−δA=Q, where δ∈(0,1], which appears for the first time in [S.M. El-Sayed, A.C.M. Ran, On an iteration methods for solving a class of nonlinear matrix equations, SIAM J. Matrix Anal. Appl. 23 (2001) 632–645]. The necessary and sufficient conditions for the existence of a solution are derived. An iterative algorithm for obtaining the positive definite solutions of the equation is discussed. The error estimations are found
DENATURALIZING CULTURE: SAYED KASHUA'S NEWSPAPER COLUMNS ON THE TOPIC OF PREJUDICE
No full textAbstract Discrimination is a recurrent topic in the work of the Israeli-Arab writer Sayed Kashua. In the last couple of years, Sayed Kashua has moved away from writing about the prejudice expressed by his own Israeli Muslim community towards the Israeli Jewish population to focus his attention instead on the prejudice shown by Jews against Arabs in Israel. Self-criticism has always been a hallmark of Sayed Kashua's work so this shift indicates a significant change in the columnist's perception of his own society. Based on a survey of various issues relating to Israeli society, such as the law, the educational system and language, as well as a theoretical review of authors who observe a mutual alienation of Arabs and Jews in Israel, this article analyses several of Sayed Kashua's recent columns in the Israeli newspaper Haaretz. It also investigates how the author understands prejudice and, in a singular and surprising way, expresses his concerns and solutions to this problem
Intrathecal Drug Delivery Systems Survey: Trends in Utilization in Pain Practice [Corrigendum]
No full textAbd-Sayed A, Fiala K, Weisbein J, et al. J Pain Res. 2022;15:1305–1314.
The authors have advised there is an error in the author list on page 1305. The author name “Alaa Abd-Sayed” should read “Alaa Abd-Elsayed”.
The authors apologize for this error
Experiencing the armed struggle : the Soweto generation and after
No full textIncludes bibliographical references (p. 354-369).This study explores the experiences of the rank-and-file soldiers of Umkhonto we Sizwe and the Azanian People's Liberation Anny. Extensive interviews by the author and other researchers reveal the voices of the soldiers themselves. The African National Congress and Pan African Congress archives at the University of the Western Cape and the University of Fort Hare supplement and verify these oral testimonies, as do some published sources. Most previously published materials about the armed struggle against apartheid have already focused on diplomacy, strategy and tactics, operations, leadership, and human rights abuses to the neglect of the soldiers' actual experiences. This study complements these with significant new oral history materials from the Soweto generation of soldiers and their successors. When dealing with MK, many authors have documented issues of the camp structure in Angola, and operations inside South Africa, so much of this detail is only addressed briefly, leaving space to explore the soldiers' experiences. In the case of APLA, very little has been written on its history, and more detail is provided on these subjects. This study therefore deals with the soldiers' politicisation and motivation for joining the armed struggle, their experiences in leaving South Africa and training in exile, the crises in exile which limited their effectiveness for a time, their return to fight in South Africa, and their difficulties in the "new" South Africa. These materials reveal that vast problems remain facing these veterans of the struggle against apartheid, and that they have the potential, if properly supported and employed, to contribute substantially to the development of present day South Africa. Conversely, if their neglect continues, they also have the potential to bring vast harm to the country. Further use of the investigative tools of oral history, especially if extended to the former soldiers' vernacular languages, is necessary to augment the history of South Africa, and these soldiers' contributions
Tão dúbio, tão coerente: forma e conteúdo nas crônicas jornalísticas de Sayed Kashua
No full textEste artigo consiste na análise de duas crônicas jornalísticas do escritor árabe-israelense Sayed Kashua publicadas no jornal israelense Haaretz. Estes textos são selecionados devido à sua riqueza de conteúdo e pelo uso de estratégias retóricas, tais como a autoironia e o sarcasmo, para expor os conflitos pelos quais passa o “eu do cronista” retratado pelo autor. Este estudo tem como base os Estudos Culturais e os Novos Paradigmas Literários, ferramentas que permitem o estudo das crônicas jornalísticas como textos literários. Nestas crônicas, de uma maneira despretensiosa, partindo de experiências subjetivas e de temas familiares, com autoironia e tom satírico, Kashua reporta as experiências de um árabe israelense que vive num embate em torno de suas duplas lealdades e ideologias conflitantes, refletindo uma negociação entre sua etnicidade e sua nacionalidade. A crônica, neste contexto, é considerada o local apropriado para a escrita de Kashua: a ambiguidade do gênero é similar à necessidade de quebras de dualidades na sociedade israelense para entendermos e convivermos com o “eu do cronista” de Sayed Kashua. So dubious, so coherent: form and content in Sayed Kashua´s journalistic chronicles - Abstract: This paper consists of the literary analysis oftwo journalistic chronicles written in Hebrew by the Muslim Arab Israeli author Sayed Kashua published in the Israeli newspaper Haaretz. These texts are selected due to their richness of content and use of rhetorical strategies such as self-irony and sarcasm to expose the conflicts through which the “I of the chronicler” portrayed by the author goesthrough. This analysis will rely on theoretical assumptions of Cultural Studies and the “New literary paradigms”, tools that will enable us to study the journalistic chronicle as a literary text. In these chronicles, in a non-pretentious way, coming from the subjective experiences and family topics, with self-irony and in a satirical way, Kashua reports the experiences of an Israeli Arab who lives in a clash over his dual loyalty and conflicting ideologies, reflecting a negotiation between his ethnicity and his nationality. The chronicle, in this context, is considered the appropriate location for Kashua’s writings: the ambiguity of the literary genre is similar to the necessity of breaking dualities in Israeli society to understand and to be acquainted with the “I of the chronicler” of Sayed Kashua
The -Neumann operator on Lipschitz -pseudoconvex domains
No full textsummary:On a bounded -pseudoconvex domain in with a Lipschitz boundary, we prove that the -Neumann operator satisfies a subelliptic -estimate on and can be extended as a bounded operator from Sobolev -spaces to Sobolev -spaces
Distributed chance-constrained model predictive control for condition-based maintenance planning for railway infrastructures
No full textWe develop a Model Predictive Control (MPC) approach for condition-based maintenance planning under uncertainty for railway infrastructure systems composed of multiple components. Piecewise-affine models with uncertain parameters are used to capture both the nonlinearity and uncertainties in the deterioration process. To keep a balance between robustness and optimality, we formulate the MPC optimization problem as a chance-constrained problem, which ensures that the constraints, e.g., bounds on the degradation level, are satisfied with a given probabilistic guarantee. Two distributed algorithms, one based on Dantzig-Wolfe decomposition and the other derived from a constraint-tightening technique, are proposed to improve the scalability of the MPC approach. Computational experiments show that the distributed method based on Dantzig-Wolfe decomposition performs the best in terms of computational time and convergence to global optimality. By comparing the chance-constrained MPC approaches with deterministic approach, and traditional time-based maintenance approach, we show that despite their high computational requirements, chance-constrained MPC approaches are cost-efficient and robust in the presence of uncertainties.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.Team Bart De SchutterRailway EngineeringDelft Center for Systems and Contro
Effect of quercus infectoria extracts on dermal wound healing in rats and assessment of its antimicrobial activity / Syed Iklls Sayed Mohamad
No full textIn this study, Quercus infectoria (Manjakani) was test for its effectiveness
in accelerating wound healing process and assessment on its antimicrobial
activity. This study comprises of animal study (wound healing) and
antimicrobial study. 4' groups of Sprague Dawley rats consists of 6 rats in
each group were used in animal study. Ethanol and aqueous extracts of the
plant were used. The rate of healing, rate of infection and histological
structure of each group was assessed to observe the effect of each treatment.
The result of the wound healing study show that that Solcoseryl® jelly (positive
control) treated mouse healed in 11 days whereas the rats treated with
Vaseline™ Petroleum jelly (negative control) taking about 13 days to healed.
The rats treated with aqueous extracts of Q. infectoria healed in 12 days and
rats treated with ethanol extracts healed within 12 to 13 days. Solcoseryl® jelly
(positive control) accelerates healing faster than the other, followed by
aqueous extracts, ethanol extracts and finally Vaseline™ Petroleum jelly. No
infection was found and wounds treated with Solcoseryl® jelly and Q.
infectoria (ethanol and aqueous) extract showed good histological structure.
Only Coagulase negative Staphylococci were identified on the wound site.
From antimicrobial study, Spot Lawn test showed 10% wlw ethanol and
aqueous extracts of Q. infectoria gave significant zone of inhibition on S.
aureus and E. coli. The effects of antibacterial study are more potent on Gram
positive bacteria (S. aureus). Compound test showed that Q. infectoria
extracts contain Polyphenol and Tannin constituents. The result from animal
study proved that Q. infectoria having beneficial effect on wound healing
Abstracts
compared to negative control. Wound healing properties of Q. infectoria
probably due to its phytochemical compounds. However, further study needs
to be carried out to identify the compounds and assess the mechanisms
responsible for both properties
Compactness of commutators of Toeplitz operators on q-pseudoconvex domains
No full textLet Ω be a bounded q-pseudoconvex domain in ℂn, n ≥ 2 and let 1 ≤ q ≤ n - 1. If Ω is smooth, we find sufficient conditions for the ∂ˉ-Neumann operator to be compact. If Ω is non-smooth and if q ≤ p ≤ n - 1, we show that compactness of the ∂ˉ-Neumann operator, Np+1, on square integrable (0, p + 1)-forms is equivalent to compactness of the commutators [Bp, z̅j], 1 ≤ j ≤ n, on square integrable ∂ˉ-closed (0, p)-forms, where Bp is the Bergman projection on (0, p)-forms. Moreover, we prove that compactness of the commutator of Bp with bounded functions percolates up in the ∂ˉ-complex on ∂ˉ-closed forms and square integrable holomorphic forms. Furthermore, we find a characterization of compactness of the canonical solution operator, Sp+1, of the ∂ˉ-equation restricted on (0, p + 1)-forms with homomorphic coefficients in terms of compactness of commutators [Tpzj*, Tpzj], 1 ≤ j ≤ n, on (0, p)-forms with holomorphic coefficients, where Tpzj is the Bergman-Toeplitz operator acting on (0, p)-forms with symbol zj. This extends to domains which are not necessarily pseudoconvex.Mathematic
Compactness of commutators of Toeplitz operators on q-pseudoconvex domains
No full textLet be a bounded q-pseudoconvex domain in ,
and let .
If is smooth, we find sufficient conditions for the
-Neumann operator to be compact.
If is non-smooth and if , we show
that compactness of the -Neumann operator, ,
on square integrable (0, p+1)-forms is equivalent to compactness of the
commutators , , on square
integrable -closed (0, p)-forms, where is the
Bergman projection on (0, p)-forms. Moreover, we prove that compactness of
the commutator of with bounded functions percolates up in the
-complex on -closed forms and square
integrable holomorphic forms. Furthermore, we find a characterization of
compactness of the canonical solution operator, , of the
-equation restricted on (0, p+1)-forms with holomorphic
coefficients in terms of compactness of commutators
,
, on (0, p)-forms with holomorphic coefficients,
where is the Bergman-Toeplitz operator acting on (0, p)-forms
with symbol . This extends to domains which are not necessarily
pseudoconvex
- …
