Results 41 to 50 of about 5,320,317 (263)

Null twisted geometries

, 2014
We define and investigate a quantisation of null hypersurfaces in the context of loop quantum gravity on a fixed graph. The main tool we use is the parametrisation of the theory in terms of twistors, which has already proved useful in discussing the ...
Speziale, Simone, Zhang, Mingyi
core   +3 more sources

Causal structure and degenerate phase boundaries [PDF]

, 1999
Timelike and null hypersurfaces in the degenerate space-times in the Ashtekar theory are defined in the light of the degenerate causal structure proposed by Matschull. Using the new definition of null hypersufaces, the conjecture that the "phase boundary"
A. Ashtekar, A. Ashtekar, Canbin Liang, G. Yoneda, H.-J. Matschull, I. Bengtsson, I. Bengtsson, I. Bengtsson, L. Bombelli, M. P. Reisenberger, M. Varadarajan, T. Jacobson, Y. Ma, Y. Ma, Yongge Ma   +14 more
core   +3 more sources

The effect of the curriculum integration approach on the academic achievement of fourth grade female students in Khash city [PDF]

مطالعات روانشناسی تربیتی, 2019
The purpose of this study was to investigate the effect of the curriculum integration approach on the academic achievement of fourth grade female students in Khash city. The research method is quasi-experimental.
tahere hashemnejad, masoud khanjarkhani, Alireza Heidarzadegan   +2 more
doaj   +1 more source

Exact solutions of closed string theory [PDF]

, 1995
We review explicitly known exact $D=4$ solutions with Minkowski signature in closed bosonic string theory. Classical string solutions with space-time interpretation are represented by conformal sigma models.
A A Tseytlin, Bardakci K, Bars I, Bars I, Behrndt K, Brinkmann H W, Callan C, Callan C, De Alwis S, de Boer J, de Vega H, de Vega H, Duff M, Duff M J, Duval C, Ferrara S, Figueroa-O'Farrill J M, Forgács P, Forgács P, Fradkin E S, Fradkin E S, Friedan D, Friedan D, Galtsov D, Gauntlett J, Gibbons G W, Gürses M, Halpern M B, Halpern M B, Horowitz G, Horowitz G, Horowitz G, Horowitz G T, Howe P, Israel W, Johnson C, Kallosh R, Kehagias A, Khuri R, Kiritsis E, Kiritsis E, Kiritsis E, Kounnas C, Kounnas C, Lovelace C, Mohammedi N, Morozov A Yu, Mukhi S, Nesterenko V V, Park J, Penrose R, Peterman A, Peterman A, Polyakov A, Polyakov A M, Russo J G, Russo J G, Russo J G, Sfetsos K, Sfetsos K, Townsend P K, Tseytlin A A, Tseytlin A A, Witten E, Yoneya T, Zamolodchikov A B   +65 more
core   +2 more sources

Assessment of causal relationships between teaching skills and students’ academic progress with the mediating role of positive and negative emotions and perceived control using the Structural Equation Modeling approach [PDF]

مطالعات روانشناسی تربیتی, 2018
The present study aimed to assess the causal relationships between teaching skills and students’ academic progress with the mediating role of positive and negative emotions and perceived control using the structural equation structural equation modeling ...
mostafa bagherian far, masoumeh fallah nodehi, aliakbar dolati   +2 more
doaj   +1 more source

A Social Support Intervention to Reduce Intentions to Drop-out from Youth Sport: The GAA Super Games Centre

Psychosocial Intervention, 2019
Research has highlighted that drop-out from youth sport has emerged to become a global trend with drop-out rates exceeding 30% in some countries. This study aimed to investigate the effect of a change in perceived support on intentions to drop out from ...
David Lavallee, Daragh Sheridan, Pete Coffee, Pat Daly   +3 more
doaj   +1 more source

The Model of Statecraft in Mirror for Prince Case Study: Tarikh _e_Beihaqi [PDF]

Faṣlnāmah-i Pizhūhish/hā-yi Rāhburdī-i Siyāsat, 2018
In this essay we put forward the STATECRAFT as a modern issue and at the same time we are trying to recognize its live questions and matters. So in this context for a first time we tried to study TARIKH_E_BEIHAQI as a mirror for princes' book and ...
Ebrahim Barzegar, saeed hassanzadeh
doaj   +1 more source

Quantum Boltzman equation study for the Kondo breakdown quantum critical point

, 2009
We develop the quantum Boltzman equation approach for the Kondo breakdown quantum critical point, involved with two bands for conduction electrons and localized fermions. Particularly, the role of vertex corrections in transport is addressed, crucial for
Kim, KS, null, Pepin, C
core   +1 more source

A fully anisotropic mechanism for formation of trapped surfaces in vacuum [PDF]

, 2013
We present a new, fully anisotropic, criterion for formation of trapped surfaces in vacuum. More precisely we provide conditions on null data, concentrated in a neighborhood of a short null geodesic segment (possibly flat everywhere else) whose future ...
Klainerman, Sergiu, Luk, Jonathan, Rodnianski, Igor   +2 more
core   +2 more sources

Predicting Chronicity in Children and Adolescents With Newly Diagnosed Immune Thrombocytopenia at the Timepoint of Diagnosis Using Machine Learning‐Based Approaches

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Objectives To identify predictors of chronic ITP (cITP) and to develop a model based on several machine learning (ML) methods to estimate the individual risk of chronicity at the timepoint of diagnosis. Methods We analyzed a longitudinal cohort of 944 children enrolled in the Intercontinental Cooperative immune thrombocytopenia (ITP) Study ...
Severin Kasser, Alice Bizeul, Meera Chitlur, Hugo Donato, Jelena Roganovic, Julia E. Vogt, Thomas Kühne   +6 more
wiley   +1 more source