7,707 research outputs found
Interview with Mostafa Moharram
No full textهذه المقابلة مع المؤلف والسيناريست المصري مصطفى محرم. يستعرض كتاباته وأفلامه ، ويؤكد على أهمية السيناريو والكتابات المتخصصة . يشرح دور كاتب السيناريو وهو المسؤول عن خلق عمل فعال وجيد ، وكذلك التعامل بطريقة جيدة مع فريق التمثيل . أجرت المقابلة درية شرف الدينIn this interview, Egyptian author and screenwriter Mostafa Moharram speaks about his movies and the importance of scenarios in creating good work. The interview was conducted by Dorreya Sharaf al-Din
Detection and Analysis of Epilepsy Biomarkers in Electrocorticography
No full textAuthor Mostafa MohammadpourDissertation Johannes Kepler Universität Linz 202
Detection and Analysis of Epilepsy Biomarkers in Electrocorticography
No full textAuthor Mostafa MohammadpourDissertation Johannes Kepler Universität Linz 202
Modelling and analysis of unreliable manufacturing assembly networks with finite storages
No full textThesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1980.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.Bibliography: leaves 160-163.by Mostafa Hamed Ammar.M.S
The thermophysical properties of seawater: A review of existing correlations and data
No full texthttp://www.deswater.com/vol16.phpCorrelations and data for the thermophysical properties of seawater are reviewed. Properties
examined include density, specific heat capacity, thermal conductivity, dynamic viscosity, surface
tension, vapor pressure, boiling point elevation, latent heat of vaporization, specific enthalpy, specific
entropy and osmotic coefficient. These properties include those needed for design of thermal
and membrane desalination processes. Results are presented in terms of regression equations as
functions of temperature and salinity. The available correlations for each property are summarized
with their range of validity and accuracy. Best-fi tted new correlations are obtained from available
data for density, dynamic viscosity, surface tension, boiling point elevation, specific enthalpy,
specific entropy and osmotic coefficient after appropriate conversion of temperature and salinity
scales to the most recent standards. In addition, a model for latent heat of vaporization is suggested.
Comparisons are carried out among these correlations, and recommendations are provided for
each property, particularly over the ranges of temperature and salinity common in thermal and/or
reverse osmosis seawater desalination applications.King Fahd University of Petroleum and MineralsCenter for Clean Water and Clean Energy at MIT and KFUP
On thermal performance of seawater cooling towers
No full textSeawater cooling towers have been used since the 1970s in power generation and other industries, so as to reduce the consumption of freshwater. The salts in seawater are known to create a number of operational problems, including salt deposition, packing blockage, corrosion, and certain environmental impacts from salt drift and blowdown return. In addition, the salinity of seawater affects the thermophysical properties that govern the thermal performance of cooling towers, including vapor pressure, density, specific heat, viscosity, thermal conductivity, and surface tension. In this paper, the thermal performance of seawater cooling towers is investigated using a detailed model of a counterflow wet cooling tower. The model takes into consideration the coupled heat and mass transfer processes and does not make any of the conventional Merkel approximations. In addition, the model incorporates the most up-to-date seawater properties in the literature. The model governing equations are solved numerically, and its validity is checked against the available data in the literature. Based on the results of the model, a correction factor that characterizes the degradation of the cooling tower effectiveness as a function of seawater salinity and temperature approach is presented for performance evaluation purposes.King Fahd University of Petroleum and MineralsCenter for Clean Water and Clean Energy at MIT and KFUP
Self-assembly of new three-dimensional molecular architectures of Cd(II) and Ag(I)–Na(I) using croconate as a building block
No full textTwo new coordination polymers [Cd(C5O5)(NH3)2]n (1) and [AgNa(C5O5)(H2O)2]n (2) (C5O52− = croconate dianion) have been synthesized and structurally characterized. Complex 1 is a one-dimensional coordination polymer of cadmium(II) bridging through the croconate dianion. In complex 1 each croconate chelates (O1 and O2) to a Cd centre, which is linked to another Cd centre by O1 through an oxo-bridge and the oxygen atom O5, neighbouring O1, binds to a third Cd centre and the remaining two oxygen atoms (O3 and O4) remain pendant. The 1D coordination polymer undergoes H-bonding interactions through N–H(NH3)⋯O (pendant of C5O5) resulting in a 3D supramolecular network. Compound 2 is a heterometallic (Ag,Na) 3D coordination polymer. Here the croconate dianions interweave the alternately aligned and layered –Na–(μ–H2O)2–Na–(μ–H2O)2− and –Ag–Ag–Ag– chains. Two croconates chelate one Ag atom and two such Ag atoms from two neighbouring layers are bridged through croconate (O1, O2) and one oxygen of each croconate remains pendant (O3). The oxygen atom (O2) from every croconate binds a Na atom via an oxo-bridge. These types of tridentate and tetradentate linkage of croconate in complexes 1 and 2 are unprecedented. The thermal studies of the complexes corroborate that the ammonia molecules in 1 and the water molecules in 2 are involved in coordination together with strong H- bonding interactions
Assessment of common pathogens in bacterial conjunctivitis and antibiotic sensitivity in Shaheed Mostafa Khomeini Hospital
No full textBackground: The most common form of ocular infection is conjunctivitis. The aim of this study is to determine the most prevalent causes of bacterial conjunctivitis and antibiotic sensitivity in Mostafa Khomeini Hospital. Materials and Methods: In this descriptive cross-sectional study, we evaluated symptom, pathogen and effective antibiotic sensitivity in bacterial conjunctivitis. In the present research, 150 cases of conjunctivitis referred to Shaheed Mostafa Khomeini Hospital were studied from Jun. 1999 to Mar. 2000. Our study was carried out based on questionnaires, examinations, cultures and antibiograms. Results: The prevalence of conjunctivitis and bacterial conjunctivitis were 3.2 and 2.1, respectively. The age limit of the patients under study was 3 days to 65 years. Positive culture in cases was 66.6. The frequency of conjunctivitis was equal in both males and females. The most frequent age of conjunctivitis was in 0-1 group. The most frequent symptoms in patients were hyperemia & tearing. The frequency of isolated pathogens were: staph. Aurous (38) penumococcus (11) pseudomonas (10) haemophilus (8) enterobacter, klebsiella, ecoli, staph. Epidermis (each 7) entrococcus (4) and moraxella catarrhal (1). The percentages of antibacterial sensitivity of isolated pathogens were: chloramphenicol 80 gentamycin 76 erythromycin 71 and tetracycline 65. Conclusion: This study showed that the most common causes of bacterial conjunctivitis are pneumococcus, haemophilus influenza and staphylococcus. Empiric therapy with new local antibiotics seems to be appropriate. Culture is not necessary except in severe, recurrent or epidemic form of conjunctivitis
Electromigration in solder joints: Towards better understanding using real-time visuals
No full textWith the increasing demands and consequent miniaturization of electronic devices, electromigration is posing a challenge to the reliability not only of integrated circuits but also of the electronic packages. A methodology is reported that allows for quasi-continuous in-situ optical microscopic imaging of a cross-sectioned solder joint (sample) during testing for electromigration. This methodology is complemented with another approach that estimates the local temperature increase from Joule heating of the sample which allows for an appropriate temperature selection for the EM test to understand the contribution of failures from Joule heating.
A SAC305 solder joint in a flip configuration was encapsulated in epoxy and cross-sectioned. Current stressing was applied to producing electromigration, with a theoretical current density in the range of (1.02 - 2.29) × 10⁴ A/cm². In-situ optical microscopic imaging and resistance measurements were performed simultaneously until an open circuit was observed. A crack and void started to form in an example experiment, and their evolution was recorded using the real-time imaging. The void and the crack continued growing until the end of current stressing. The void area at the cross-section grew to 1500 μm² while the crack grew to a length of 110 μm. After 330 h, the experiment was stopped as an open circuit occurred, which was preceded by a 10% rise of the resistance, indicating failure due to electromigration. During the end of the test, the test vehicle temperature increased by 20 °C as a result of increased Joule heating due to the loss in cross-sectional area of the solder joint. The location of the void did not agree with the expected current crowding location at the solder joint corner. It was inferred that the formation of cracks due to internal stresses prompted the formation of the void at that location that resulted in the open circuit, demonstrating the interconnection between the various failure mechanisms caused by EM. Microstructural changes were also monitored after the open circuit and were possibly due to the thermal stress occurring once the sample cooled down. Hillock formation and additional cracks were observed 30 min after the open circuit.
The results highlight the unique capacity of real-time imaging to support more detailed electromigration research in solder joints by tracing the source of specific failure events. Additionally, cross-sectioning of samples for real-time visuals decreases the cross-sectional area and increases the current density, allowing for accelerated EM testing. Thus, the use of real-time visuals allows for accelerated tests which is helpful for studying EM under varying test conditions and comparing the reliability of different solder materials through a detailed analysis of the failure times
L’année de Bacchus d’El Mostafa Bouignane entre devoir de la mémoire et exaltation de la vie
No full textThis study will discuss the approach to the structure and narrative composition of the novel entitled L\u27année de Bacchus by Mostafa Bouignane, published by Virgule Editions in 2020. This text adds to a series of stories of which Bouignane constructs a narrative universe to reveal the nature of man who, even submissive and reduced, remains capable of regaining his freedom and leading a peaceful life. Thus, our study will propose an analysis of the ideological and historical dimension of this text representative of the literary experience of the author, then at the end the questioning of his human and moral values
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