513 research outputs found
4D, N = 1 Supersymmetry Genomics (I)
Presented in this paper the nature of the supersymmetrical representation
theory behind 4D, N = 1 theories, as described by component fields, is
investigated using the tools of Adinkras and Garden Algebras. A survey of
familiar matter multiplets using these techniques reveals they are described by
two fundamental valise Adinkras that are given the names of the cis-Valise
(c-V) and the trans-Valise (t-V). A conjecture is made that all off-shell 4D, N
= 1 component descriptions of supermultiplets are associated with two integers
- the numbers of c-V and t-V Adinkras that occur in the representation.Comment: 53 pages, 19 figures, Report-II of SSTPRS 2008 Added another chapter
for clarificatio
Dyakonov--Tamm wave at the planar interface of a chiral sculptured thin film and an isotropic dielectric material
Surface waves, named here as Dyakonov--Tamm waves, can exist at the planar interface of an isotropic dielectric material and a chiral sculptured thin film (STF). Due to the periodic nonhomogeneity of a chiral STF, the range of the refractive index of the isotropic material is smaller but the range of the propagation direction in the interface plane is much larger, in comparison to those for the existence of Dyakonov waves at the planar interface of an isotropic dielectric material and a columnar thin film
A unified framework for dataset shift diagnostics
Supervised learning techniques typically assume training data originates from
the target population. Yet, in reality, dataset shift frequently arises, which,
if not adequately taken into account, may decrease the performance of their
predictors. In this work, we propose a novel and flexible framework called
DetectShift that quantifies and tests for multiple dataset shifts, encompassing
shifts in the distributions of , , , , and .
DetectShift equips practitioners with insights into data shifts, facilitating
the adaptation or retraining of predictors using both source and target data.
This proves extremely valuable when labeled samples in the target domain are
limited. The framework utilizes test statistics with the same nature to
quantify the magnitude of the various shifts, making results more
interpretable. It is versatile, suitable for regression and classification
tasks, and accommodates diverse data forms - tabular, text, or image.
Experimental results demonstrate the effectiveness of DetectShift in detecting
dataset shifts even in higher dimensions
Metal-catalyzed asymmetric aldol reactions
The aldol reaction is one of the most powerful and versatile methods for the construction of C-C bonds. Traditionally, this reaction was developed in a stoichiometric version; however, great efforts in the development of chiral catalysts for aldol reactions were performed in recent years. Thus, in this review article, the development of metal-mediated chiral catalysts in Mukaiyama-type aldol reaction, reductive aldol reaction and direct aldol reaction are discussed. Moreover, the application of these catalysts in the total synthesis of complex molecules is discussed.A reação aldólica é uma das ferramentas mais poderosas e versáteis para a construção de ligações C-C. Tradicionalmente, esta reação foi desenvolvida em sua versão estequiométrica, no entanto, grandes esforços no desenvolvimento de catalisadores quirais para reações aldólicas foram realizados nos últimos anos. Desta forma, neste artigo de revisão, é discutido o desenvolvimento de catalisadores metálicos em reação aldólica do tipo Mukaiyama, reação aldólica redutiva e reação aldólica direta. Além disto, a aplicação destes catalisadores na sÃntese total de moléculas complexas será abordada.21372158Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de NÃvel Superior (CAPES
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