Twistor representation of null two-surfaces [PDF]
, 2001 We present a twistor description for null two-surfaces (null strings) in 4D Minkowski space-time. The Lagrangian density for a variational principle is taken as a surface-forming null bivector.
Ashtekar +26 more
core +2 more sources
Report Summary – Mental Illness in Canada, 2015
Health Promotion and Chronic Disease Prevention in Canada, 2015 null
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doaj +1 more source
Supersymmetric null-surfaces [PDF]
, 2004 Single trace operators with the large R-charge in supersymmetric Yang-Mills theory correspond to the null-surfaces in $AdS_5\times S^5$. We argue that the moduli space of the null-surfaces is the space of contours in the super-Grassmanian parametrizing ...
A. Galperin +28 more
core +2 more sources
Psychological / social and perceptual / motor ergonomics of intelligent classes with students' health [PDF]
مطالعات روانشناسی تربیتی, 2019 Objective of this survey is to evaluate the mental-social and conceptual-kinetic ergonomic relationship of smart classes with students’ health. Its statistical population is all girl and boy students of grade six in primary schools who were studying in ...
alireza badele, Fahimeh Al-Sadat Sahebi
doaj +1 more source
Explanation of philosophy for children and philosophy of human learning with emphasis on the Winch views [PDF]
مطالعات روانشناسی تربیتی, 2018 The purpose of present study is to explain the philosophy of learning with emphasis on Winch's learning theory. To answer the question of what is the relation of Winch's philosophy of learning with the other learning approaches, by using the conceptual ...
Gholamhasan Panahi +3 more
doaj +1 more source
An Analytical field study on the Principles of Sustainability in the Interior Design of Modern Egyptian Buildings [PDF]
Journal of Architecture, Art & Humanistic Science, 2022 The world is constantly moving towards environmental-friendliness, and there are plenty of modern concepts that attempt to link architecture and the environment, in previous as well as current times.
Najla Yousif +2 more
doaj +1 more source
Null Killing vectors and geometry of null strings in Einstein spaces [PDF]
, 2013 Einstein complex spacetimes admitting null Killing or null homothetic Killing vectors are studied. These vectors define totally null and geodesic 2-surfaces called the null strings or twistor surfaces.
Chudecki, Adam
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Obstacles and Challenges of Enhancing Capabilities of Rural Cooperatives' Firms in Hamedan Province [PDF]
تعاون و کشاورزی, 2018 The aim of this study was to explore the possible solutions to increase the capabilities of the rural cooperatives' firms in Hamadan. Research method used in this study was a descriptive-analytical and data gathering methods were both surveying and ...
Masoud Samian, Reza Movahed
doaj +1 more source
Semantic analysis of "Qarib" in the Qur'an with the approach of bringing together divine attributes [PDF]
پژوهش نامه معارف قرآنی, 2021 “Qarib” is one of the ultimate concepts in the system of religious beliefs and this adjective as a mysterious quality in the Quran indicates the proximity of God to man.
fateme ًQorbani +1 more
doaj +1 more source
Role of Fishing Cooperatives in Promoting Entrepreneurship Spirit between Their Members [PDF]
تعاون و کشاورزی, 2018 The main purpose of this research was to determine the impacts of fishing cooperatives on promoting entrepreneurship spirit among their members. The population included 1820 members of the three fishing cooperatives in Bushehr province.
Masoud Samian +2 more
doaj +1 more source