Скачать книгу - Circular Staircase

This book was written in response to the growing demand for a text that provides a unified treatment of linear and nonlinear complex valued adaptive filters, and methods for the processing of general complex signals (circular and noncircular). It brings together adaptive filtering algorithms for feedforward (transversal) and feedback architectures and the recent developments in the statistics of complex variable, under the powerful frameworks of CR (Wirtinger) calculus and augmented complex statistics. This offers a number of theoretical performance gains, which is illustrated on both stochastic gradient algorithms, such as the augmented complex least mean square (ACLMS), and those based on Kalman filters. This work is supported by a number of simulations using synthetic and real world data, including the noncircular and intermittent radar and wind signals.

Set in St. Petersburg, Russia, this novel won the Romantic Novel of the Year Award (1981) by the Romantic Novelists' Association.St Petersburg, 1912. Rose Gowrie is a Scottish girl with a mysterious gift for healing who is hired into the aristocratic household of Dolly Denisov, supposedly as a companion for the youthful Ariadne Denisov. But Rose gets more than she bargains for when she is called upon to cure the aged Princess who lives at the top of the Red Staircase, and the frail young Tsarevitch…

A raw, intensely personal memoir of spiritual exploration from one of the world’s great commentators on religion.After seven years in a convent, which she left, dismayed by its restrictions, an experience recounted in ‘Through the Narrow Gate’, Karen Armstrong struggled to establish herself in a new way of life, and became entrapped in a downward spiral, haunted by despair, anorexia and suicidal feelings.Despite her departure from the convent she remained within the Catholic Church until the God she believed in 'died on me', and she entered a ‘wild and Godless period of crazy parties and numerous lovers’. Her attempts to reach happiness and carve out a career failed repeatedly, in spectacular fashion. She began writing her bestseller ‘A History of God’ in a spirit of scepticism, but through studying other religious traditions she found a very different kind of faith which drew from Christianity, Judaism and Islam and, eventually, spiritual and personal calm.In her own words, her ‘story is a graphic illustration – almost an allegory – of a widespread dilemma. It is emblematic of a more general flight from institutional religion and a groping towards a form of faith that has not yet been fully articulated but which is nevertheless in the process of declaring itself’. Her lifelong inability to pray and to conform to traditional structures of worship is shared by the many who are leaving the established churches but who desire intensely a spiritual aspect to their lives.‘The Spiral Staircase’ grapples with the issue of how we can be religious in the contemporary world, and the place and possibility of belief in the 21st-century.