We review a manifestly supersymmetric off-shell formulation of a wide class of torsionful (4, 4) 2D sigma models and their massive deformations in the harmonic superspace with a double set of SU(2) harmonic variables. Sigma models with both commuting and non-commuting left and right complex structures are treated.

The quantization of a pair of commuting differential operators is a pair of non-commuting differential operators. Both at the classical and quantum level the flows of the KP hierarchy are defined and further one can consider switching, up to a sign, the ordering of the operators. We discuss the interaction of these operations with the quantization.

We show, using the no–disentanglement theorem, that to teleport (exactly) any set of non–commuting states (i.e., a set containing at least two non–commuting states), it is necessary to have an entangled channel. We further show that to teleport any set of commuting states it is sufficient to have a classically correlated channel. Using this result we provide a simple proof of the fact that any ...

OBJECTIVES Given the link between active commuting and physical activity, this study examined factors associated with active commuting among a nationally representative sample of Canadian youth. METHODS Using data from the 2010-11 Youth Smoking Survey, this study examined different forms of commuting (active, inactive, mixed) and factors associated with either mixed or active commuting among ...

This research uses an ordered-response model to evaluate the factors that impact bicycle frequency use for an individual’s commute to and from work. The data used for this paper were gathered during an original survey effort conducted over the Internet in 2002. The paper presents empirical results and discusses the policy implications of these results for urban planning. In addition, the paper ...

OBJECTIVE To investigate physical activity during leisure time and commuting among persons aged 15-69 years in the urban population of Tianjin, China, and to assess its associations with demographic and health-related characteristics. METHODS In 1996 a cross-sectional survey of 2002 males and 1974 females provided information on physical activity during leisure time and commuting and on demog...