In this paper, we consider a new type of Bessel beams having Fourier-invariance property and, therefore, called Fourier-Bessel beams. contrast to the known beams, these have weak side lobes. Analytical expressions for complex amplitude proposed field in initial plane source and far region been obtained. It is shown that finite energy, although they do not Gaussian envelope. Their proportional f...

Natalia Gudino, Jacco A de Zwart, Qi Duan, Stephen J Dodd, Peter Van Gelderen, and Jeff H Duyn Advanced MRI section, LFMI, NINDS, National Institutes of Health, Bethesda, MD, United States, LFMI, NINDS, National Institutes of Health, Bethesda, MD, United States Audience: Those interested in RF circuit design and TX systems. Purpose: On-coil Current-Mode Class-D (CMCD) amplification offers seve...

An intracavity KTiOPO(4) (KTP) optical parametric oscillator (OPO) pumped by a simultaneously Q-switched and mode-locked (QML) Nd:Gd(3)Ga(5)O(12) (Nd:GGG) laser with an acousto-optic modulator (AOM) and a Cr(4+):YAG saturable absorber is presented. A minimum mode-locking pulse duration underneath the Q-switched envelope was evaluated to be about 290 ps. A maximum QML output power of 82 mW at th...

background and aims: infectious bronchitis virus (ibv) is the etiological agent of infectious bronchitis (ib), which is an acute and highly contagious disease of the respiratory and sometimes the urogenital tracts of chickens. in iran, the disease has been identified in chicken flocks with serological and virus isolation methods. gene 3c (e) encode envelop (small membrane) protein. for envelope...

It is well documented that removal of the V1V2 region or of the V2 loop alone from the envelope glycoprotein of human immunodeficiency virus type 1 (HIV-1) or simian immunodeficiency virus (SIV) increases the susceptibility of these viruses to neutralization by antibodies. The specific role of the V1 loop in defining the neutralization susceptibility of HIV is, however, not well documented. Our...

in this paper, a new high dynamic range digitally-controlled oscillator (dco) for all-dpll systems is proposed. the proposed dco is based on using a δς modulator as a digital-to-analog converter. using δς dac can provide a very high resolution (18-bit) control on the dco. the δς dac output is a 2-level pulse signal that needs to be filtered for cancelling the out of band shaped noise. the used ...