Microminiature pulse tube cryocoolers should operate at a frequency of an order higher than the conventional macro ones because the pulse tube cryocooler operating frequency scales inversely with the square of the pulse tube diameter. In this paper, the design and experiments of a high frequency pressure oscillator is presented with the aim to power a micropulse tube cryocooler operating betwee...

The technical equipment developed and used in both installation and operation processes in refineries, oil and gas pipelines, and gas booster stations has always been expensive. Hence, managers at different organizational levels are keen to find methods to control and reduce these costs. Generally speaking, the operators in a gas booster station choose the operating devices without considering ...

The feasibility of three-terminal junction devices for frequency doubling and rectification reaching the terahertz range is studied both experimentally and numerically (by means of Monte Carlo simulations). Experiments at room temperature up to 94 GHz for detection and to 4 GHz for doubling and phase detection are shown. The influence of the width of the branches and the shape of the junction (...

This document describes several aspects relating to the design of dc-dc converters operating at frequencies in the VHF range (30-300 MHz). Design considerations are treated in the context of a dc-dc converter operating at a switching frequency of 100 MHz. Gate drive, rectifier and control designs are explored in detail, and experimental measurements of the complete converter are presented that ...

The use of residual current devices (RCDs) is obligatory in many types low-voltage circuits. They are that ensure protection against electric shock the case indirect contact and may additional direct contact. For latter purpose protection, only RCDs a rated operating not exceeding 30 mA suitable. Unfortunately, modem current-using equipment supplied via electronic converters with pulse width mo...

A major problem in an isolated DC/DC converters operating at high switching frequencies is the attendant switching losses in the semiconductor devices. This can be reduced by introducing either zero-voltage switching (ZVS) or zero-current switching (ZCS) of the semiconductor switches. This paper deals with the simulation, design, fabrication and experimental evaluation of a novel soft-switching...

In the last decade Micromechanical components for communication applications has been fabricated via IC-compatible MEMS technologies. In fact, its most important impact is not at the component level, but rather at the system level, by offering alternative transceiver architectures that reduce power consumption and enhance performance. In this paper a mixer-filter for AM frequency receiver with ...

[1] Analysis of 412 solar radio burst events in the microwave range [1.2--18] GHz that were measured at the New Jersey Institute of Technology Owens Valley Solar Array over 2 years (2001--2002) during the peak of the 23rd solar cycle is conducted in the context of the possible interference of such bursts with radio-receiving and radar systems that operate at these frequencies. It is found that ...