Ahmed Eladawy

In this paper, a novel fully differential second-generation current conveyor (FDCCII) is presented. The proposed block is useful in mixed-mode applications where fully differential signal processing is required. Furthermore, the FDCCII can be used to realize MOSFET-C filters. The circuit has a bandwidth of about 10 MHz under heavy capacitive loads and can operate from low supply voltages down to /spl plusmn/1.5 V.

Sea surface temperature (SST) and surface wind (SW) are considered the most important components in air–sea interactions. This study examines the relationships between SST, SW and various oceanic variables in the northern Red Sea (NRS) during the period of 2000–2014. The current study is the first attempt to identify the SST fronts and their relationship with the dominant circulation patterns. SST fronts are mapped using the Cayula and Cornillon algorithms. The analysis is performed with availab

This study investigates issues related to hydrodynamics in Lake El-Burullus and flow patterns therein. Burullus Lake is the second largest lake in the northern Egyptian coast with a total area of 410 km 2 . It was utilized Delft3D-flow module to develop a field validated hydrodynamic model. The shallow brackish Lake is mainly affected by uncontrolled creeping of development areas and growing inflow of untreated agricultural, municipal and industrial drainage water. The developed model was used t

Corals in the northern Red Sea exhibit high thermal tolerance despite the increasing heat stress. It is assumed that corals throughout the Red Sea have similar bleaching thresholds (32°C or higher), and hence greater bleaching tolerance of corals in the northern Red Sea region is likely due to lower ambient water temperatures (25–28°C) that remain well below the corals’ physiological maxima. Whether bleaching patterns across the Red Sea are independent of the local maximum monthly mean of seawat

Abstract The Grand Ethiopian Renaissance Dam (GERD) filling and operation is a highly sensitive issue for Egypt and Sudan. A recently accepted manuscript by Heggy et al (2021 Environ. Res. Lett. 16 074022) assessed the water deficit for Egypt based on different scenarios for the first filling of GERD lake and estimated 31 billion cubic meters per year under a 3 year filling scenario. We would like to present grossly mischaracterized assumptions, inaccurate data, and controversial conclusions fou

Red Sea tourism is highly dependent on the natural resources especially the diversity of Egyptian coral reefs. Local coral bleaching monitoring framework was applied in this study to investigate the threats. The target area included the six richest spots of coral reefs in terms of bio-diversity and tolerance to various stresses. Assessment of the applicability and accuracy of remotely sensed sea surface temperature (SST) data in the region were assessed by comparing them with in situ measurement

El-Burullus Lake is affected by increasing and extensive human activities, rapid social-economic development and the construction of fish ponds nearby. This has significantly impacted the health of the lake eco-system. On the foundation of the twodimensional depth averaged hydrodynamic model, distributions of the salinity, Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and Ammonium (NH 4 ) were modeled. The heat flux model was also utilized to enhance the ac

A new CMOS programmable rail-to rail transconductor is presented. A linear V-I characteristic is obtained by using the principle of nonlinearity cancellation of matched MOS transistors operating in the ohmic region. Rail-to-rail operation is achieved by using two complementary blocks. The circuit is suitable for low voltage as it can operate from supply voltages down to /spl plusmn/1.5 V. PSpice simulations show that the transconductance gain can be electronically tuned from 13 to 90 /spl mu/ A/