Ahmed Hady - Academia.edu (original) (raw)

Papers by Ahmed Hady

Open Access Macedonian Journal of Medical Sciences, 2017

BACKGROUND: Bladder cancer represents the fifth most common malignancy worldwide and a major caus... more BACKGROUND: Bladder cancer represents the fifth most common malignancy worldwide and a major cause of cancer-related morbidity and death. Incidence and mortality rates have remained relatively constant over the past four decades. Urothelial bladder cancers have identified multiple risk factors.AIM: We aimed at evaluating the expression of the FGFR3 protein and gene amplification in the urothelial cells of neoplastic and non-neoplastic urothelial lesions of the urinary bladder, and correlation with tumour grade, stage and associated bilharziasis.MATERIAL AND METHODS: One hundred and five different urinary bladder lesions were studied, including 15 cystitis cases (9 bilharzial and 6 non-bilharzial cystitides), 75 urothelial carcinoma cases (18 bilharzial associated and 57 non-bilharzial associated) and 15 squamous cell carcinoma associated with bilharziasis, beside 5 control cases. Data concerning age, sex, tumour grade, stage, and associated bilharziasis were obtained. Each case was ...

The time series of average monthly sunspot numbers during 1900-1992 is studied by using power spe... more The time series of average monthly sunspot numbers during 1900-1992 is studied by using power spectral analysis. This prediction method is used to study the sunspot periodicities relations between its, and with the other periodicities by solar activities. There are periodicities (between few days and 5 years) overwhelm on the mean solar cycle. ( 11 year cycle). These periodicities have the same relation with variations of solar constant and solar radiation reaching the Earth's atmosphere in the last solar cycle. These periods are related to the solar magnetic activity and to the modulation of solar features due to solar rotation.

Al-Azhar Assiut Medical Journal, 2018

Background Methicillin-resistant Staphylococcus aureus (MRSA) is a common nosocomial pathogen tha... more Background Methicillin-resistant Staphylococcus aureus (MRSA) is a common nosocomial pathogen that causes infections among healthcare workers. Objective The aim of this study was to detect the prevalence of MRSA among medical residents in different departments of Al-Azhar University Hospital, Damietta branch. Patients and methods Eighty-four medical residents were subjected to a questionnaire that included questions on personal data, occupational experience, antimicrobial intake, infection-control training, and implementation of infection-control programs in the hospital, and a check list that indicated individual adherence to infection-control measures and bacteriological study for isolation and identification of MRSA. Nasal swabs were obtained from 84 residents. The isolates were identified as S. aureus on the basis of morphology, Gram stain, catalase test, coagulase test, mannitol salt agar fermentation, and cefoxitin disc diffusion. Results The overall bacteria-carriage rate amo...

Environmental Monitoring and Assessment

Bacillus anthracis , the causative agent for anthrax, is a dangerous pathogen to humans and has a... more Bacillus anthracis , the causative agent for anthrax, is a dangerous pathogen to humans and has a history as a bioterrorism agent. While sampling methods have been developed and evaluated for characterizing and clearing contaminated indoor sites, the performance of these sampling methods is unknown for use in outdoor environments. This paper presents surface sampling data for Bacillus atrophaeus spores, a surrogate for B. anthracis , from a 210-day outdoor study that evaluated the detection and recovery of spores using five different sampling methods as follows: sponge sticks, 37-mm vacuum filter cassettes, residential wet vacuums, robotic floor cleaners, and grab samples of soil, leaves, and grass. The spores were applied by spraying a liquid suspension onto the surfaces. Both asphalt and concrete surfaces were sampled by all the surface sampling methods, excluding grab sampling. Stainless steel coupons placed outdoors were additionally sampled using sponge sticks. Sampling methods differed in their ability to collect detectable spores over the duration of the study. The 37-mm vacuums and sponge sticks consistently detected spores on asphalt through day 37 and robots through day 99. The wet vacuums detected spores on asphalt for days 1 and 4, but not again until day 210. On concrete, all samplers detected spores until day 210 except for sponge stick samplers that detected spores only up until the day 99 time point. For all sampling methods, spore recoveries were higher from concrete than from asphalt surfaces. There was no statistically significant difference in recoveries of sponge sticks and 37-mm vacuums from either asphalt or concrete surfaces. Processing of grab samples was challenging due to non-target background microorganisms resulting in high detection limits for the samples.

Foraging is a fundamental behavior as animals’ search for food is crucial for their survival. Pat... more Foraging is a fundamental behavior as animals’ search for food is crucial for their survival. Patch leaving is a canonical foraging behavior, but classic theoretical conceptions of patch leaving decisions lack some key naturalistic details. Optimal foraging theory provides general rules for when an animal should leave a patch, but does not provide mechanistic insights about how those rules change with the structure of the environment. Such a mechanistic framework would aid in designing quantitative experiments to unravel behavioral and neural underpinnings of foraging. To address these shortcomings, we develop a normative theory of patch foraging decisions. Using a Bayesian approach, we treat patch leaving behavior as a statistical inference problem. We derive the animals’ optimal decision strategies in both non-depleting and depleting environments. A majority of these cases can be analyzed explicitly using methods from stochastic processes. Our behavioral predictions are expressed ...

Frontiers in Ecology and Evolution

A canonical foraging task is the patch-leaving problem, in which a forager must decide to leave a... more A canonical foraging task is the patch-leaving problem, in which a forager must decide to leave a current resource in search for another. Theoretical work has derived optimal strategies for when to leave a patch, and experiments have tested for conditions where animals do or do not follow an optimal strategy. Nevertheless, models of patch-leaving decisions do not consider the imperfect and noisy sampling process through which an animal gathers information, and how this process is constrained by neurobiological mechanisms. In this theoretical study, we formulate an evidence accumulation model of patch-leaving decisions where the animal averages over noisy measurements to estimate the state of the current patch and the overall environment. Evidence accumulation models belong to the class of drift diffusion processes and have been used to model decision making in different contexts especially in cognitive and systems neuroscience. We solve the model for conditions where foraging decisi...

Advances in Space Research

Abstract The trend towards the development of small satellites, or smallsats, has been increasing... more Abstract The trend towards the development of small satellites, or smallsats, has been increasing over the last few years. However, the harsh space radiation environment in which these smallsats operate provides a challenge to their survivability as their desired mission lengths increase from a few months to several years also. Smallsats typically use commercial off the shelf components (COTS) that are built for ground operations, not space use. Therefore, they may be more susceptible to the hazards of space radiation than traditional spacecraft which are typically designed to withstand the high radiation levels of space. The present paper provides a targeted assessment of representative COTS components using up to date models of the space radiation environment and its effects on smallsats in a polar Low Earth Orbit (LEO). This orbit will be assumed to be sun synchronous (98.5° inclination) and at an altitude of 800 km. We employed the new Solar Accumulated and Peak Proton and Heavy Ion Radiation Environment (SAPPHIRE) model which has been released recently in 2018, ISO-15390 GCR model, and AP8/AE8 models to estimate the space radiation environment for solar particles, galactic cosmic rays (GCRs), and trapped protons and electrons respectively. The basic damage effects that can be produced in materials and electronics in this orbit due to their exposure to the space radiation are evaluated. These effects are the Total Ionizing Dose (TID), Displacement Damage Dose (DDD), and Single Event Effects (SEE) as represented by Single Event Upsets (SEUs). SEU is evaluated for different COTS components which are believed to be representative of an optimum blend of capability and cost-effectiveness for the next generation of smallsats, including 20 nm Xilinx Kintex Ultra Scale FPGA Configuration RAM (XCKU040), 90-nm SRAM, and MLC NAND flash memory (MT29F128G08CBECBH6). For comparative purposes, the analyses are performed for both maximum and minimum solar activity. Based on these comparisons, we find as expected that the space radiation environment parameters vary with solar activity. The fluence of trapped electrons and solar protons at solar maximum are higher than those at solar minimum in contrast to the trapped protons and galactic cosmic rays at low altitudes. On the other hand, TID, DDD, and SEE all show higher values during maximum solar activity than during minimum solar activity. The use of shielding material for small satellites is mandatory for this orbit as observed TID, DDD, and SEES levels that can be reached are potentially of concern to designers. However, using Al shielding thickness of at least 1.5 mm can reduce the radiation effects to acceptable levels, for both maximum and minimum solar activity for missions of moderate (∼3 years) duration.

Proceedings of the International Astronomical Union, 2004

AIP Conference Proceedings, 2010

Energetic Solar particles and Geomagnetic Indices during the last two cycles were given. The data... more Energetic Solar particles and Geomagnetic Indices during the last two cycles were given. The data of the grouped flares and 10.7 cm radio flux were obtained from Solar Geophysical data reports by the US Department of Commerce, during the solar cycle 22 and 23. Power spectrum analyses method were used for the data treatments, to find the intermediate-term periodicities, 14, 28, 35 are significant. Long-term periodicities periodicity 154 days appeared, and confirmed with the other results. Halloween storms during Nov. 2003 and its effects on the geomagnetic storms have been studied analytically. The data of amplitude and phase of most common indicators of geomagnetic activities during solar cycle 23 has been analyzed.

International Conference on Space Information Technology 2009, 2009

ABSTRACT

Journal of Advanced Research, 2013

Proceedings of North Africa Technical Conference and Exhibition, 2010

... Reservoir Simulation Explains Production Problems in Nile Delta Gas Field Hossam El Sheriff, ... more ... Reservoir Simulation Explains Production Problems in Nile Delta Gas Field Hossam El Sheriff, Mohamed Reda, Christine Gonzalez, SPE, Dr Almoataz ... was modeled using the concepts of sequence stratigraphy to build the basic reservoir architecture for the Abu Madi Formation. ...

Closed-loop neurophysiology has been accelerated by recent software and hardware developments and... more Closed-loop neurophysiology has been accelerated by recent software and hardware developments and by the emergence of novel tools to control neuronal activity with spatial and temporal precision, in which stimuli are delivered in real time based on recordings or behavior. Real-time stimulation feedback enables a wide range of innovative studies of information processing and plasticity in neuronal networks. This Research Topic e-Book comprises 16 Original Research Articles, seven Methods Articles, and seven Reviews, Mini-Reviews, and Perspectives, all peer-reviewed and published in Frontiers in Neural Circuits. The contributions deal with closed loop neurophysiology experiments at a variety of levels of neural circuit complexity. Some include modeling and theoretical analyses. New enabling technologies and techniques are described. Novel work is presented from experiments in vitro, in vivo, and in humans, along with their clinical and technological implications for improving the huma...

Solar energetic particles during Halloween storm from October 17, 2003 to re-entry on November 10... more Solar energetic particles during Halloween storm from October 17, 2003 to re-entry on November 10, 2003) was given. The used data has have been obtained from the Solar Geophysical data reports (US Department of Commerce). During Halloween storm period, the sunspot area increased up to 1.11 x 10-9 Hemisphere on October 19, and grown up to 5.69 x 10-9 Hemisphere on October 30, 2003. Then it decreased to 1.11 x 10-9 Hemisphere on November 4, 2003. Also, the radio flux of lambda = 10.7 cm increased from 120 sfu on October 19, to 298 sfu on October 26, 2003, then decreased to 168 sfu on November 4, 2003. There were two eruptive solar proton flares, which were release on 26 and 28 October 2003. The causes of the release of these Eruptive Storms have been discussed for that period.

The data of amplitude and phase of most common indicators of geomagnetic activities (especially a... more The data of amplitude and phase of most common indicators of geomagnetic activities (especially aa index, A? index) have been analyzed and compared with the solar ac- tivities in the time of solar cycle 23(started from 1996 to 2007). The data taken from NOAA space environment center (SES), USA. during the period starting April 1996 Until Dec. 2001, have been analyzed by power spectrum method. The prediction until year 2007 of geomagnetic activities were studied according to the whole of behavior of solar cycle 23. The results show a good indication of the effects of solar activities on changes of earth climate and weather forecasting. The results are important to various techniques including the operation of low earth orbiting satellites. The climatologi- cal approach makes use of the secular trend since year 1900 until now, by about 15 nanotesla. This indication was recorded too, in solar activity changes during the last century.

North Africa Technical …, 2010