It is shown, based on an expression for the received pressure field in pulsed medical ultrasound systems, that a common one-dimensional pulse can be estimated from individual A-lines. An autoregressive moving average (ARMA) model is suggested for the pulse, and an estimator based on the prediction error method is derived. The estimator is used on a segment of an A-line, assuming that the pulse ...

A modification of the traditional pulse-position modulation (PPM) scheme typically employed on the optical direct-detection channel is proposed that allows for significantly improved information throughput and bandwidth advantage. The scheme sends a multitude (K) of pulses per symbol interval and as such provides a signal constellation whose size, for a given number of pulse slots (M), varies a...

pregnancy, birthweight 3260 g. At 8 weeks she was moderately cyanotic, weight was 4593 g, heart rate 140, blood pressure 90 mmHg by flush. There was a grade 1/6 systolic ejection murmur which was heard best along the left stemal border. There were palpable brachial and femoral pulses. The dermatoglyphs were normal. Chromosome study was normal (46, XX), and other laboratory studies, including se...

Drawing upon the cultural risk perspective and writings on risk taking, this paper seeks to develop ideas relating to the effective use of school cyberspace. It is argued that some individuals respond to exaggerated, yet seductive, discourses of online risks by over-blocking, unreasonably restricting students’ Internet activity. At the same time, there are sensible, even compelling, motivations...

Ultra-wideband (UWB) uses narrow band pulses of nano-seconds to provide high data rate communications .These narrow pulses spread the energy across a wide frequency band that is why it is called ultra-wideband. In this paper, we will discuss the UWB pulse modulation and multiple access modulation schemes using Pulse Position Modulation technique .The simulations are done in MATLAB software.

Evaluating the potential reward and risk associated with a choice of action plays an important role in everyday decision making. However, the details behind how reward and risk affect the decisions for actions remain unclear. The present study investigates the influence of reward and risk on a decision to make a speeded motor response. One hundred and ten college students performed a Speed-Rewa...

OBJECTIVE The aim of the present research was to examine associations between poor driving behaviour (DB), driving when fatigued (DF), risk taking (RT) and road traffic accidents (RTAs). DESIGN The study involved a cross-sectional online survey of clients of an insurance company. The survey measured DB (speeding, distraction, lapses of attention and aggression), RT and frequency of driving wh...

We develop a full numerical as well as an approximate analytic solution for two-step holographic recording with high intensity pulses in LiNbO3 :Fe crystals. We find the unknown material parameters by fitting the numerical solution to the experimental results. The two important parameters that were unknown so far and found in this work are the bulk photovoltaic coefficient and absorption cross ...