The success of multicarrier modulation in the form of orthogonal-frequency-division-modulation (OFDM) in radio channels illuminates a clear path one could take towards high-rate underwater acoustic communications. However, earlier work on the application of OFDM in underwater has only had limited success. We aim to make OFDM work in underwater and build a practical multicarrier modem prototype....

Medicine in Egypt and Mesopotamia then attract the attention of the European scholar. India, China and Arabia come next. Greece and Rome are considered a little later. Then come the early Christian era from 1 A.D. to 500 A.D., the Middle Ages from 500 A.D. to 1500 A.D. and lastly the modem era from 1500 A.D. All the periods have got their rituals and ideologies maturing ultimately into the pres...

In many fields of modem optics specially shaped optical pulses are desired. One of the most precise techniques employs a manipulation of the spatially dispersed optical frequency components ofthe incoming ultrashort laser pulses [1]. As a result, the output pulses are shaped and broadened in time. The aim of the present work is to provide evidences on the possibility [2] for a simultaneous shap...

Avoiding knock is the major design constraint for spark ignition engines because of the unacceptable noise and engine damage associated with it. Hence, the Research and Motor Octane Number (RON and MON) tests were established in 1928 such that a fuel with a higher RON and MON is less likely to knock than a fuel with a lower value. However, engine and fuel technology has evolved since 1928, and ...

Background: In recent years, nanomaterials have been widely used in large quantities which make people bemore frequently exposed to the chemically synthesized nanoparticles (NPs). When NPs are introduced intoan organism, they may interact with a variety of cellular components with yet largely unknown pathologicalconsequences.Objective: I...

In this paper we present experimental results evaluating the performance and fairness of FAST TCP in a series of tests involving realistic low rate network access scenarios. Links both using the DOCSIS cable modem medium access control (MAC) cable modem and simple low rate links were investigated. We seek to compare our expectations from theory with the behavior of an actual access network impl...