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Search Results: 1 - 10 of 20 matches for " Yehonatan Sharaby "
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Significance of Prenuptial Rituals as Ethnic Definitional Ceremonies among Immigrants  [PDF]
Rachel Sharaby
Advances in Anthropology (AA) , 2017, DOI: 10.4236/aa.2017.72005
Abstract: This article adopts the paradigm that claims the non-disappearance of the ritual and ritual changes in modern and postmodern society. A wedding is an event in which a group of people speaks to itself and about itself. Images of the social structure and cultural content, of couplehood, family and personal and group identity surface through this cultural act. Weddings and their customs thus comprise a window through which the social values of a group can be observed, be it a modern or a traditional society. The anthropological study of the prenuptial rituals of immigrants from Georgia to Israel, and my experience with the ethnic pride of the celebrators, most of them young, lead me to conclude that these rituals serve as collective ethnic definitional ceremonies for them, where crossing between ethnicity, culture and identity takes place. The new ritual tradition in Israel fulfills an important role in the identity of the youths of this community and in the solidarity of the Georgian family and community. Tradition was processed anew and interpreted through the renewed ritual patterns, and became intertwined with modernity. A process of syncretism was thus created.
Agents of Patriarchy Teach Gender  [PDF]
Rachel Sharaby
Advances in Anthropology (AA) , 2019, DOI: 10.4236/aa.2019.91002
Abstract: This article discusses veteran instructors who were employed by the ab-sorbing establishment as instructors for women immigrants from Yemen who settled in moshav-type cooperative settlements in Israel. The findings indicate that the instruction messages in the first stage after the Yemenite immigrants settled on the land included a blurring of gender. However, differential instruction was created when the permanent homes were constructed: male instructors taught the men the hard physical labor, and female instructors taught the women their roles within the domestic sphere. The instruction system recruited to the new moshav-type cooperative settlements thus perpetuated the gender division of labor and used an effective “tool” for transmitting the patriarchic messages of the absorbing establishment.
The Minimal Deneddylase Core of the COP9 Signalosome Excludes the Csn6 MPN? Domain
Elah Pick, Amnon Golan, Jacob Z. Zimbler, Liquan Guo, Yehonatan Sharaby, Tomohiko Tsuge, Kay Hofmann, Ning Wei
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0043980
Abstract: The COP9 signalosome (CSN) is a eukaryotic protein complex, which regulates a wide range of biological processes mainly through modulating the cullin ubiquitin E3 ligases in the ubiquitin-proteasome pathway. The CSN possesses a highly conserved deneddylase activity that centers at the JAMM motif of the Csn5 subunit but requires other subunits in a complex assembly. The classic CSN is composed of 8 subunits (Csn1–8), yet in several Ascomycota, the complex is smaller and lacks orthologs for a few CSN subunits, but nevertheless contains a conserved Csn5. This feature makes yeast a powerful model to determine the minimal assemblage required for deneddylation activity. Here we report, that Csi1, a diverged S. cerevisiae CSN subunit, displays significant homology with the carboxyl terminal domain of the canonical Csn6, but lacks the amino terminal MPN- domain. Through the comparative and experimental analyses of the budding yeast and the mammalian CSNs, we demonstrate that the MPN? domain of the canonical mouse Csn6 is not part of the CSN deneddylase core. We also show that the carboxyl domain of Csn6 has an indispensable role in maintaining the integrity of the CSN complex. The CSN complex assembled with the carboxyl fragment of Csn6, despite its lack of an MPN? domain, is fully active in deneddylation of cullins. We propose that the budding yeast Csi1 is a functional equivalent of the canonical Csn6, and thus the composition of the CSN across phyla is more conserved than hitherto appreciated.
Some Natural Plant Extracts Having Biocide Activities against the American Bollworm Helicoverpa armigera (Lepidoptera: Noctuidae)  [PDF]
Aziza Sharaby, Zamzam M. Al Dhafar
Advances in Entomology (AE) , 2019, DOI: 10.4236/ae.2019.71002
Abstract: In the present research, the toxicity, antifeedant activity and biological effects of ethanolic leaves extract of four medicinal plants named Eucalyptus rostrata, Dodonea viscosa, Rhyza stricta and Cymbopogon schoenanthus were evaluated on 2nd, 3rd and 4th instar larvae of H. armigera under laboratory condition. The results showed that values of LC50 in mg of different plant extracts in mg/100ml of the larval diet can be arranged in an ascending order as follows: Dodonea 7.23 > Cymbopogon 12.59 > Rhazya 14.52 > Eucalyptus 29.42 mg/100ml diet (the least LC50 is more toxic than the higher one). All the tested extracts had antifeedant and starvation effects against the 2nd, 3rd, 4th instar larvae. D. viscose extract possesses the least antifeedant effect even of their higher toxicity. There was clear relation between the percent of starvation and antifeedant of the 2nd, 3rd and 4th larval instar. All extracts were nearly the same in their effect on the biotic potential; of the insect, and possess latent effect when tested against 2nd instar larvae, the value of LC 50 of the extract was added to the diet, extracts increased larval duration, deformation between pupae and adult stages, moths sterility, increased as decreasing in females egg production. Other effects were noticed, reduction in percentage of pupation and moths emergence. The plant extracts can be arranged ascending according to percentage of their sterility effects as follows: C. schoenanthus < E. rostrata < R. stricta < D. viscose. All extracts cause disruption on the biology and physiology of the insect, and all extract induced percentages of deformation between pupal and moth stages. The ethanolic extract of the plant leaves of the tested plans may be used for control H. armigera in combination with other methods in the integrated program in order to decrease the buildup of the resistance and protect the environment from chemical pollution.
Eigenvectors of the discrete Laplacian on regular graphs - a statistical approach
Yehonatan Elon
Physics , 2008, DOI: 10.1088/1751-8113/41/43/435203
Abstract: In an attempt to characterize the structure of eigenvectors of random regular graphs, we investigate the correlations between the components of the eigenvectors associated to different vertices. In addition, we provide numerical observations, suggesting that the eigenvectors follow a Gaussian distribution. Following this assumption, we reconstruct some properties of the nodal structure which were observed in numerical simulations, but were not explained so far. We also show that some statistical properties of the nodal pattern cannot be described in terms of a percolation model, as opposed to the suggested correspondence for eigenvectors of 2 dimensional manifolds.
Gaussian Waves on the Regular Tree
Yehonatan Elon
Physics , 2009,
Abstract: We consider the family of real (generalized) eigenfunctions of the adjacency operator on $T_d$ - the $d$-regular tree. We show the existence of a unique invariant Gaussian process on the ensemble and derive explicitly its covariance operator. We investigate the typical structure of level sets of the process. In particular we show that the entropic repulsion of the level sets is uniformly bounded and prove the existence of a critical threshold, above which the level sets are all of finite cardinality and below it an infinite component appears almost surely.
Could quantum mechanics, and even gravity, be all about a correct resolution of the classical self-force problem?
Yehonatan Knoll
Physics , 2011,
Abstract: The self-force problem of classical electrodynamics has two closely linked facets: The ill defined dynamics of a point charge due to the divergent self field at the position of the charge, and the divergence of formally conserved quantities, such as the energy, associated with symmetries of the corresponding Lagrangian. Fixing the self-force problem amounts to the construction of a \emph{new} theory, which is free of the above pathologies and yet "sufficiently close" to the immensely successful original. In a recent paper by the present author such a proposal, dubbed extended charge dynamics (ECD), was presented. The essential ingredients of classical electrodynamics preserved by ECD (and, among the plethora of solutions to the problem, only by ECD) are: - Ontology. The electromagnetic field is the same unquantized classical field, while charges are sufficiently localized conserved currents, accounting for the manifest corpuscular nature of elementary charges. - Symmetries. ECD enjoys the full symmetry group of classical electrodynamics, most importantly the hidden symmetry of scale covariance. - Conservation laws. All ECD conservation laws formally coincide with their classical counterparts, and yet lead to finite conserved quantities. Despite this seemingly classical setting, and the reduction of ECD to classical electrodynamics in the latter's domain of validity, it is shown in the present paper that ensembles of ECD solutions could, in principle, reproduce the statistical predictions of quantum mechanics. Exclusively quantum mechanical concepts, such as interference, violations of Bell's inequalities, spin and even photons (despite the use of a classical EM field), all emerge as mere statistical manifestations of the self interaction of ECD charges.
From the classical self-force problem to the foundations of quantum mechanics and beyond
Yehonatan Knoll
Physics , 2012,
Abstract: Classical electrodynamics and general relativity are successful non-theories: Plagued by the self-force problem, both are ill defined yet extremely practical. The paradox of a `practical non theory' is resolved in the current paper by showing that the experimentally valid content of classical electrodynamics can be extracted from a set of axioms, or constitutive relations, circumventing the ill-definedness of the self-force. A concrete realization of these constitutive relations by a well defined theory of testable content is presented, and it is argued that all previous attempts to resolve the self-force problem fail to do so, thus, at most, turning a non-theory into a theory - which is not classical electrodynamics. The proposed theory is shown to be compatible with the statistical predictions of quantum mechanics, thus providing an (observer independent) ontology in a `block universe' formulation. A straightforward generally covariant extension of the proposed theory of classical electrodynamics leads to a well defined general relativity incorporating matter, suggesting new interpretations of some astronomical observations. A tentative model of subatomic physics is sketched, which is based on the proposed theory of classical electrodynamics alone. Thus the failure to properly address the century old classical self-force problem may be at the crux of modern physics.
An inversion formula for the spherical mean transform with data on an ellipsoid in two and three dimensions
Yehonatan Salman
Mathematics , 2012,
Abstract: In the articles [1] and [2] of D. Finch, M. Haltmeier, S. Patch and D. Rakesh inversion formulas were found in any dimension $n\geq2$ for recovering a smooth function with compact support in the unit ball from spherical means centered on the unit sphere. The aim of this article is to show that the methods used in [1], [2] can be modified in order to get similar inversion formulas from spherical means centered on an ellipsoid in two and three dimensional spaces.
Scale covariant physics: A `quantum deformation' of classical electrodynamics
Yehonatan Knoll,Irad Yavneh
Physics , 2009, DOI: 10.1088/1751-8113/43/5/055401
Abstract: Scale covariance -- the notion that there is no absolute size, only relative size -- is probably as old an idea as translation covariance. Yet, in our laboratories we find no evidence for this appealing symmetry. For this reason, privileged length-scales, such as the Compton length or the Bohr radius, enter directly the \emph{equations} of physics rather than surfacing as attributes of specific \emph{solutions}, in analogy to the way a privileged position is introduced into a translation covariant equation by any localized solution. We propose to elevate the status of a scaling symmetry to that of translation symmetry. Within our proposed theory, a solution may `drift in scale', thereby offering a mechanism by which matter may `cluster in scale' in analogy to spatial clustering in galaxies (particles comprising galaxies all have almost the same position on the intergalactic scale). Our proposed theory is a scale covariant deformation of classical electrodynamics, reducing to the later in its domain of validity. The resultant theory, dubbed Extended Charge Dynamics (ECD), is a remarkably rich theory, containing ingredients encountered nowhere else in theoretical physics, yet economically formulated as a simple variational principle. We argue the case for ECD being a `hidden variables model' for quantum mechanics i.e. that quantum mechanics describe statistical aspects of ensembles of ECD solutions. Among else, this perspective offers at once a prediction, pertaining to the notion of a photon, which is at odds with current theory. We further speculate that the same `remote sensing' mechanism endowed by ECD to a charge, responsible for many quantum mechanical effects, is also behind gravitational effects.
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