in this paper, by using the survival models, survival functions for the time from birth to the event of using formula (i.e. the time that baby in fed by breast milk) in urban and rural areas of takestan (iran, winter 1998) are reported. later the relation between the mentioned time and some factors are also discussed. the kaplan-meire method and cox regression are used in this paper as well. 48...

mycotoxins are secondary metabolites of molds and have adverse effects on humans, animals, and crops. those can cause illnesses and economic losses. aflatoxin m1 (afm1) is one of the mycotoxins produced from the hydroxylated metabolite of aflatoxin b1 (afb1). it can be found in milk or milk products obtained from livestock that have ingested contaminated feed. in this paper, recent studies were...

Project DoCTA focuses on understanding interaction in a set of collaborative telelearning scenarios aimed at teacher training. Rooted in a sociocultural perspective, two scenarios were studied from thirteen views including ethnographic flavoured studies focused on understanding work organisation, usability studies of groupware systems, evaluations of computer logs, and questionnaire studies. Th...

We review the main aspects of the fragmentation of bottom quarks in top quark decay. The NLO b-quark energy spectrum presents large mass logarithms ln(mt/m 2 b), which can be resummed by the use of the approach of perturbative fragmentation functions. Large soft contributions in both coefficient function and initial condition of the perturbative fragmentation function have been resummed as well...

A novel method to calculate fB on the lattice is introduced, based on the study of the dependence of finite size effects upon the heavy quark mass of flavoured mesons and on a non–perturbative recursive finite size technique. We avoid the systematic errors related to extrapolations from the static limit or to renormalization aspects of non–relativistic QCD and the results can be extrapolated to...

Parton distributions for the pion are studied in a chiral quark model characterized by a quark propagator for which a spectral representation is assumed. Electromagnetic and chiral symmetry constraints are imposed through the relevant Ward-Takahashi identities for flavoured vertex functions. Finiteness of the theory, requires the spectral function to be non-positive definite. Straightforward ca...

Estimates are presented for the branching ratios of several two-particle B-meson decays into flavoured scalar mesons. It seems that there are no estimates of B-meson decays into scalar mesons. The purpose of this short note is to present such estimates. As will be shown, some two-particle decays of B-mesons into scalar mesons have sufficiently large branchings to be of current interest. 1. Havi...

We explore a novel mechanism to restrict TeV-scale leptoquark interactions and render the proton exactly stable all orders in effective field theory expansion. A scalar condensate breaks lepton-flavoured U(1)X gauge symmetry ultraviolet generates neutrino masses, leaving discrete Z9 or Z18 infrared, forbidding ?B=1 processes. This provides an elegant framework address flavour anomalies can be a...