10,953 research outputs found
The Optimum Distance at which to Determine the Size of a Giant Air Shower
To determine the size of an extensive air shower it is not necessary to have
knowledge of the function that describes the fall-off of signal size from the
shower core (the lateral distribution function). In this paper an analysis with
a simple Monte Carlo model is used to show that an optimum ground parameter can
be identified for each individual shower. At this optimal core distance,
, the fluctuations in the expected signal, ,
due to a lack of knowledge of the lateral distribution function are minimised.
Furthermore it is shown that the optimum ground parameter is determined
primarily by the array geometry, with little dependence on the energy or zenith
angle of the shower or choice of lateral distribution function. For an array
such as the Pierre Auger Southern Observatory, with detectors separated by 1500
m in a triangular configuration, the optimum distance at which to measure this
characteristic signal is close to 1000 m
Linear and nonlinear response of a rectangular plate subjected to lateral and inplane sonic boom disturbances
Transient response of rectangular window pane exposed to sonic boom disturbance using linear and nonlinear theorie
Parameters for Twisted Representations
The study of Hermitian forms on a real reductive group gives rise, in the
unequal rank case, to a new class of Kazhdan-Lusztig-Vogan polynomials. These
are associated with an outer automorphism of , and are related to
representations of the extended group . These polynomials were
defined geometrically by Lusztig and Vogan in "Quasisplit Hecke Algebras and
Symmetric Spaces", Duke Math. J. 163 (2014), 983--1034. In order to use their
results to compute the polynomials, one needs to describe explicitly the
extension of representations to the extended group. This paper analyzes these
extensions, and thereby gives a complete algorithm for computing the
polynomials. This algorithm is being implemented in the Atlas of Lie Groups and
Representations software
Algebraic methods in the theory of generalized Harish-Chandra modules
This paper is a review of results on generalized Harish-Chandra modules in
the framework of cohomological induction. The main results, obtained during the
last 10 years, concern the structure of the fundamental series of
modules, where is a semisimple Lie
algebra and is an arbitrary algebraic reductive in
subalgebra. These results lead to a classification of simple
modules of finite type with generic minimal
types, which we state. We establish a new result about the
Fernando-Kac subalgebra of a fundamental series module. In addition, we pay
special attention to the case when is an eligible subalgebra
(see the definition in section 4) in which we prove stronger versions of our
main results. If is eligible, the fundamental series of
modules yields a natural algebraic generalization
of Harish-Chandra's discrete series modules.Comment: Keywords : generalized Harish-Chandra module, (g,k)-module of finite
type, minimal k-type, Fernando-Kac subalgebra, eligible subalgebra; Pages no.
: 13; Bibliography : 21 item
An Institutional Framework for Heterogeneous Formal Development in UML
We present a framework for formal software development with UML. In contrast
to previous approaches that equip UML with a formal semantics, we follow an
institution based heterogeneous approach. This can express suitable formal
semantics of the different UML diagram types directly, without the need to map
everything to one specific formalism (let it be first-order logic or graph
grammars). We show how different aspects of the formal development process can
be coherently formalised, ranging from requirements over design and Hoare-style
conditions on code to the implementation itself. The framework can be used to
verify consistency of different UML diagrams both horizontally (e.g.,
consistency among various requirements) as well as vertically (e.g.,
correctness of design or implementation w.r.t. the requirements)
Biochemical Research on Mongolian lichens, Bryophytes and Vascular Plants ā In Memoriam, Dr. Siegfried Huneck (1928ā2011)
Dr. Siegfried Huneck, biochemist and lichenologist from the Institute for Biochemistry of Plants in Halle/Saale, died on September 9, 2011. He was a world wide leading expert on lichen substances. An obituary with curriculum vitae and a complete list of publications was published by Stordeur et al. (2011
A CASE STUDY OF PEDAGOGICAL PRACTICES THAT BOOST CHINESE STUDENTSā ORAL ENGLISH SELF-CONFIDENCE
Practice is necessary for developing oral English proficiency, but many Chinese learners of English lack the self-confidence to practice oral English; furthermore, studentsā self-confidence deficiency is perpetuated by insufficient oral English proficiency. The purpose of this qualitative case study was to discover pedagogical practices that break the cycle of the reciprocal effect of deficiencies in oral English and in self-confidence in Chinese adult PhD non-English major students. Six participants who raised their oral English proficiency and self-confidence during their PhD studies described their English learning journeys by responding to interview questions. Analyzation of data from interview responses developed into two themes of pedagogical practices that simultaneously raised participantsā oral English fluency and boosted their self-confidence. The results of this study revealed the specific speaking and listening strategies and aspects of fostering a learning environment that were effective for the participants and are recommended for raising oral English proficiency and self-confidence for Chinese adult PhD non-English major students
Mother-Infant Attachment: Path Analysis of the Predictive Role of Trauma Therapy and Select Demographics on Mother\u27s Cognitive Responses
Problem
The best outcome for attachment when an infant is born would be a secure attachment, but this is not always the case. Insecure attachments are likely to be formed when the mother has experienced domestic violence given the right environment (Huth-Bocks et al., 2011; Theran et al., 2005). A previous study showed that changes to attachment due to postnatal intervention are based on external behaviors rather than internal though processes (Theran et al., 2005). Because of this, the purpose of this study is to compare therapy categories and each of the observable attachment factors.
Method
Participants completed a survey which measured the tolerance, acceptance, pleasure in proximity, and competence as a parent in regard to the mother\u27s response to her child(ren) ages zero to six months old, as well demographic information. Data was analyzed using a one-way multivariate analysis of variance (MANOVA), a one-way analysis of variance (ANOVA), post hoc tests, and a path analysis to answer two main research questions and five sub-questions.
Results
The MANOVA results showed a marginally significant difference among the trauma therapy categories on the dependent variables. Subsequent ANOVA results showed that, individually, trauma therapy had a significant effect on tolerance, pleasure in proximity, and competence as a parent. Bonferroni post hoc analysis showed that not attending therapy significantly differs from attending group therapy in regard to competence as a parent. The hypothesized model was a good fit for the data. This model indicated a weak statistically significant direct effect of childhood abuse on trauma therapy. Race, childhood abuse, and support system all had weak statistically significant direct effect on ATT and trauma therapy had a weak moderately significant direct effect on ATT.
Conclusion
This study was designed to help understand if various types of trauma therapy could be effective in the formation of a more secure attachment between mother and infant when the mother has had a history of domestic violence. This study also looked to understand if various demographic factors have an effect on the attendance of trauma therapy or on ATT, either directly or as mediated through trauma therapy. Results have indicated that when looking at maternal attachment responses, it may be more beneficial to look at the individual types of trauma therapy and areas of attachment rather than at trauma therapy and attachment as wholes. In regard to demographic factors, there were weak significant direct effects found for both trauma therapy and ATT. This study also offers various implications for future research and professional practice
The size and polydispersity of silica nanoparticles under simulated hot spring conditions
The nucleation and growth of silica nanoparticles in supersaturated geothermal waters was simulated using a flow-through geothermal simulator system. The effect of silica concentration ([SiO2]), ionic strength (IS), temperature (T) and organic additives on the size and polydispersity of the forming silica nanoparticles was quantified. A decrease in temperature (58 to 33Ā°C) and the addition of glucose restricted particle growth to sizes <20 nm, while varying [SiO2] or ISdid not affect the size (30-35 nm) and polydispersity (Ā±9 nm) observed at 58Ā°C. Conversely, the addition of xanthan gum induced the development of thin films that enhanced silica aggregation
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