A new set of on shell duality equations is proposed that leads to a map between strings moving on symmetric spaces with opposite curvatures. The transformation maps “waves” on a riemannian symmetric space M to “waves” on its dual riemannian symmetric space M̃ . This transformation preserves the energy momentum tensor though it is not a canonical transformation. The preservation of the energy mom...

The asymmetric distribution of human spatial attention has been repeatedly documented in both patients and healthy controls. Biases in the distribution of attention and/or in the mental representation of space may also affect some aspects of language processing. We investigated whether biases in attention and/or mental representation of space affect semantic representations. In particular, we i...

People have numerous ways of negotiating their interaction with imperfect technologies. Descriptions of these practices can be found scattered throughout literature, but always at the edges, or mentioned as interesting cases. Rarely (if ever) are forms of negotiated use the central focus. This paper develops the concept of negotiated use as way of engaging with technology that shares attributes...

this study aimed to investigate the factors affecting intention of citizens toward participating in activities related to development and protection of green spaces in tehran. the research was descriptive-correlation and survey method was used. the statistical population of this study consisted of all citizens in tehran. using proportional and stratified random sampling, 626 citizens were selec...

objective ultrasonography is among the most general evaluating methods for central nervous system (cns) assessment, especially for detecting extra axial collection via anterior fontanel. there are few studies showing values of this technique in normal developing infants for detection of subarachnoid space width. association between age and sex and cerebrospinal fluid (csf) spaces are controvers...

Dirac measure is an important measure in many related branches to mathematics. The current paper characterizes measure-preserving transformations between two Dirac measure spaces or a Dirac measure space and a probability measure space. Also, it studies isomorphic Dirac measure spaces, equivalence Dirac measure algebras, and conjugate of Dirac measure spaces. The equivalence classes of a Dirac ...