Hot talk, cold science

Cold and hot.

Hot & Cold Working

Q.1. What is hot working ? State its principles, advantages and disadvantages. Ans. Mechanical working of metals above its recrystallisation temperature is known as hot working. Advantages : 1. Larger deformation can be accomplished and more rapidly by hot working since the metal is in plastic state. 2. Porosity of the metal is considerably minimised. 3. Concentrated impurities, if any in the m...

Leeches run cold, then hot.

Food processing is costly, potentially limiting the energy and time devoted to other essential functions such as locomotion or reproduction. In ectotherms, post-prandial thermophily, the selection of a warm environmental temperature after feeding, may be advantageous in minimizing the duration of this elevated cost. Although present in many vertebrate taxa, this behaviour had not previously bee...

Hot Topics in Cold Gases

Since the first experimental realization of Bose-Einstein condensation in cold atomic gases in 1995 there has been a surge of activity in this field. Ingenious experiments have allowed us to probe matter close to zero temperature and reveal some of the fascinating effects quantum mechanics has bestowed on nature. It is a challenge for mathematical physicists to understand these various phenomen...

Predictions of a Cold + Hot

Cold + Hot Dark Matter (CHDM) = 1 cosmological models require a total neutrino mass 5 eV. Because recent data support the ! oscillation explanation of the cosmic ray deecit, which requires that m() m(), this suggests that m() m() 2:4 eV. The linear calculations and N-body simulation reported here indicate that an = 1 CHDM model with two 2.4 eV neutrinos (designated C 2 DM) agrees remarkably wel...