development of yeast artificial chromosome (y ac) vectors, molecular cloning of large segments of chromosomal dna, and their propagation in yeast cells has become feasible. overlapping y ac provides a route to the development of physical maps of entire mammalian chromosomes. a rapid method was developed to isolate and sequence termini of y ac inserts quickly. the y ac clone is digested with a r...

This article proposes the study, control and analysis of topology an AC–AC modular multilevel converter, known in literature as Hexverter. The Hexverter is capable converting energy between two AC systems with a reduced number elements, if compared other topologies, which makes this attractive applications. However, there are few studies about literature, so work presents its operation principl...

چکیده: در این مقاله یک مبدل dc-dc بدون ترانسفورماتور با ضریب بهره بالا و تنش ولتاژ پائین در دو سر کلید فعال پیشنهاد می شود. در این مبدل تنها یک کلید فعال به کار رفته است، لذا کنترل مبدل پیشنهادی ساده بوده و تلفات هدایتی کلید فعال نیز پائین است. بهره ولتاژ مبدل پیشنهادی در مقایسه با مبدل افزاینده مرسوم بالاتر بوده و مبدل پیشنهادی ناحیه کاری رژیم هدایت پیوسته را گسترش می دهد. مبدل پیشنهادی دارای ...

Abstract. This work presents the design of robust sliding mode controllers for three-phase ac-ac matrix converters, in order to guarantee output sinusoidal waveforms and near unity input power factor. First, the sliding mode controller, based on the state-space vectors modulation technique, is designed for the matrix converter and the obtained results are compared to those obtained using the cl...

A high-speed capacitance difference-to-sum ratio measurement circuit is presented for differential capacitance transducers. It consists of a switched-capacitor input stage, two sample-and-hold (S/H) circuits followed by voltage-to-current (V/I) converters, and a current-ratio-controlled relaxation oscillator. This circuit offers a square-wave output whose oscillation period is directly proporti...

In this paper, a digital compensation scheme for coefficient errors of a complex filter bank parallel A/D converter in low-IF receivers is presented. The complex filter bank is employed to suppress DC offset and image signals in the lowIF receivers and relax the requirements on the conversion rate and resolution of A/D converters. The proposed compensation scheme regenerates interference due to...

Matrix converter (MC) is an AC-AC power converter topology that directly converts energy from AC source to an AC load without using any energy storage components. Therefore, the disturbances in the input voltages can propagate onto the output side and degrade or even deteriorate the performance of motor load. This paper investigates the behavior of MC and its influence to the performance of ind...