We consider the Yamabe flow of a conformally Euclidean manifold for which the conformal factor’s reciprocal is a quadratic function of the Cartesian coordinates at each instant in time. This leads to a class of explicit solutions having no continuous symmetries (no Killing fields) but which converge in time to the cigar soliton (in two-dimensions, where the Ricci and Yamabe flows coincide) or i...

We provide a unified investigation of normal modes and sound propagation at zero temperature in Bose condensed gases confined in highly asymmetric harmonic traps and interacting with repulsive forces. By using hydrodynamic theory for superfluids we obtain explicit analytic results for the dispersion law of the low energy discretized modes for both cigar and disk shaped geometries, including the...

A population-based case-control study of cancer of oral cavity-oropharynv was conducted in the city of Torino, Italy, between 1982 and 1984. One hundred twenty-two cases (86 males and 36 females) and 606 control«(385 males and 221 females) were compared with respect to lifelong alcohol and tobacco consumption. A 4to 6-fold increase in risk among subjects with medium or high tobacco consumption...

Data from a five year follow up study on 4372 smokers and 3753 non-smokers were analysed to investigate the influence of the type of tobacco smoked and whether the subjects said they inhaled or not on the decline in forced expiratory volume in one second (FEV1). The study sample comprised 1492 smokers of plain cigarettes and 1936 smokers of filter cigarettes, 1711 smokers of cheroots or cigars,...

INTRODUCTION Nicotine dependence establishes itself more rapidly among adolescents than among adults. Tobacco occupies the fourth place in the rank of main risk factors for non-communicable diseases in the continent. Studies reveal that other forms of tobacco use have increased among adolescents. METHODS Were included the 9th grade students from the 26 State Capitals and the Federal District....

Many causes of lung cancer have been identifi ed, including active cigarette smoking 3 ; exposure to secondhand cigarette smoke (passive smoking) 4 ; pipe and cigar smoking 5 ; occupational exposure to agents such as asbestos, nickel, chromium, and arsenic 6 ; exposure to radiation, including radon gas in homes and mines 7 ; and exposure to indoor and outdoor air pollution. 8 Despite the identi...

BACKGROUND Little is known about the knowledge and attitudes towards tobacco use among medical students in Canada. Our objectives were to estimate the prevalence of tobacco use among medical students, assess their perceived level of education about tobacco addiction management and their preparedness to address tobacco use with their future patients. METHODS A cross-sectional online survey was...