We review small x contributions to perturbative evolution equations for parton distributions, and their resummation. We emphasize in particular the resummation technique recently developed in order to deal with the apparent instability of naive small x evolution kernels and understand the empirical sucess of fixed–order perturbation theory. We give predictions for the gluon distribution and the...

The software industry is an important economic activity in industrial countries. Nowadays the investment in this field measured in millions of dollars, the IT organizations varies in their size and role. An area of concern to IT organizations is implementing and adopting Software Process Improvement (SPI) models. For many years, researchers have developed several SPI model, most of which like C...

M ost computer users interact with the Internet from a desktop or laptop computer running a Web browser such as Internet Explorer or Netscape. Interaction typically involves downloading and viewing documents that include content as well as links to Adobe PDFs, audio, video, Microsoft Office, and other HTML documents. Users tend to view content and links together, rapidly alternating between rea...

Abs t rac t We introduce some methods for constrained nonlinear programming that are widely used in practice and that are known under the names SQP for sequential quadratic programming and SCP for sequential convex programming. In both cases, convex subproblems are formulated, in the first case a quadratic programming problem, in the second case a separable nonlinear program in inverse variable...

We are contructing an interferometric telescope, the Very Small Array, to study the cosmic microwave background on angular scales 0.2–4.5◦ . The physical layout and electronic design of the telescope are optimised to give maximum protection from systematic effects, while still providing sufficient sensitivity to make high signal-to-noise images. A prototype single baseline is currently being te...