Hard, soft, hot, cold

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...

Hard knowledge, soft values

The paper contrasts two domains of school education, natural science and citizenship education (as a paradigm of “hard” and “soft” subjects), with respect to their epistemological and ethical foundations. A sharp contrast between their associated world-views within the school community is accentuated at the outset. The epistemological shortcomings inherent in both are subsequently explored, and...

Soft and Hard Qcd *

I review various theoretical questions that arise from data from HERA and the Tevatron, and which are relevant for the LHC. They range from soft physics, such as the total cross section, to hard physics, such as Higgs production. In particular, I argue that the proton's gluon density is somewhat larger at small x than is currently accepted.

Soft and hard pomerons

Regge theory provides an excellent description of small-x structurefunction data from Q = 0 up to the highest available values. The large-Q data should also be described by perturbative QCD: the two descriptions must agree in the region where they overlap. However, at present there is a serious lack in our understanding of how to apply perturbative QCD at small x. The usual lowestorder or next-...