Oscillators are kernel components of electrical and electronic circuits. Discussion of history, mechanisms and design based on Barkhausens observation. Discussion of a Wien Bridge oscillator based on the question: Why does this circuit oscillate ?

Rapid change is nothing new in a discipline that only has a lifespan of approximately fifty years. What is unique at the moment however, is the speed at which industry is adopting and then utilising these changes. The Internet is the primary driver in this rapid evolution, and this requires a step change in the thinking behind software evolution. Logically, and financially, it makes sense for t...

Modern science is a main driver of technological innovation. The efficiency of the scientific system is of key importance to ensure the competitiveness of a nation or region. However, the scientific system that we use today was devised centuries ago and is inadequate for our current ICT-based society: the peer review system encourages conservatism, journal publications are monolithic and slow, ...

Recently, monolithic columns consisting of one piece of an organic polymer or silica with flow-through pores have been reported in the literature. These materials provide better stability and, more important, higher performance than conventional columns packed with particles. Although they can be prepared by various methods, monolithic columns prepared by the direct polymerization of monomers c...

The article deals with the creation of continuous metal and monolithic reinforced concrete bridge spans, which are most effective. Efficiency is achieved by finding opportunities for unification structures successful options providing them required load-bearing capacity lowest cost building materials. bending moments that occur in sections a structure distributed more evenly take on smaller val...

To improve the transport infrastructure of Republic Uzbekistan, there is a tendency to build monolithic structures bridges and overpasses. The article presents calculation bridge on 1083 rd km M-39 highway passing through city Samarkand. results dynamic loads are presented, based records two real seismograms dangerous earthquakes registered for system with spectral composition: Gazli (Uzbekista...

Deformation modulus of rock mass has a significant role in the support design of an underground excavation. It is determined by expensive in-situ tests or by empirical models. Existing models for estimation of deformation modulus do not consider its stress dependence. Herein, data from several sources is used to develop a stress- (depth-) dependent relation for estimation of deformation modulus...

Estimating maximum scour depth is normally required in order to determine the depth of  bridge piles. The present paper uses the SSIIM Software which considers flow and sediment equations in a three dimensional manner. The software models flow field around circular bridge pile by resolving Navier-Stokes three-dimensional equations and k-  method, and by temporary solution of flow field and cont...