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

Papers by Hamza Ahmed

English Language Institute Journal

This paper highlights the importance of technology in teaching English language in Sudanese highe... more This paper highlights the importance of technology in teaching English language in Sudanese higher secondary schools. Dealing with computers in reading and writing nowadays is considered as a core element of literacy in the age of information. Many countries in the world have recognized the importance and the great value of using digital technologies in language learning. Teaching English language is a debate that thousands of scholars speak about. A lot of papers have discussed this matter because of its importance and because it is known that teaching is considered the first source of learning language. Gilster (1997) puts the assurance more specifically on digital literacy so as to understand information in a wide range of sources. Although many teachers and curricula designers neglect the role that technology can achieve in teaching English language, using technology to equip the teaching process with many choices, can make learning more motivating and make teaching more product...

Egyptian Journal of Neck Surgery and Otorhinolaryngology, 2022

Pakistan Journal Of Neurological Surgery, 2020

Objective: The aim of the current study is to describe the technical details of the endoscopic su... more Objective: The aim of the current study is to describe the technical details of the endoscopic supraorbital keyhole craniotomy and how to avoid complications related with it.Material and Methods: In this cross sectional observational study nine preserved human cadavers from TheSkull Base Lab of Weill Cornell Medical College, Cornell University, New York, USA were used. Total number of18 endoscopic supraorbital keyhole craniotomies were performed. Distances between the different targetedanatomical constructs were looked at and measured.Results: A supraorbital craniotomy was performed with details on the technique of the surgery. The secondmajor part of the results comprised of per-operative complications and how to avoid these complications.Conclusion: To treat anterior and middle skull base pathologies, the endoscopic supraorbital keyholecraniotomy is an effective, valuable and minimal access surgical choice.

Egyptian Journal of Neck Surgery and Otorhinolaryngology, 2021

Imaging and Applied Optics 2018 (3D, AO, AIO, COSI, DH, IS, LACSEA, LS&C, MATH, pcAOP), 2018

We present the design and experimental demonstration of a novel LG spectrum measurement technique... more We present the design and experimental demonstration of a novel LG spectrum measurement technique in which the detection efficiency of all modes in an unknown, incoming superposition state is simultaneously the maximum possible.

We analyzed the structure of cross-correlation in China’s Shanghai Stock Exchange by examining da... more We analyzed the structure of cross-correlation in China’s Shanghai Stock Exchange by examining daily price changes of nearly 1000 stocks for the time period between January 1, 2005 and July 15, 2015. We determined characteristics in the Chinese stock market during times of crisis by examining the 2008 crash and the 2015 crash. By determining the probability distribution of yearly cross-correlation matrices, we ascertained that during times of crisis, stocks become highly correlated with one another. We also calculated deviating eigenvalues for four year time periods with a two year sliding window in order to find the magnitude of these correlations. Recognizing that the market wide effect clouds true correlations, we first calculated that China has a large market wide effect through inverse participation ratios, and then removed the effect through regression. After removing the market wide effect, we constructed network analysis diagrams for time periods of four years with a two year sliding window to show how different business sectors interact with each other before, during, and after times of crisis. Because there were fewer correlations in the Shanghai Stock Exchange during the 2015 crash, we concluded that the recent downturn is not as severe as the 2008 crash

Introduction: Epistaxis is a very common medical problem affecting up to 60% of population at a p... more Introduction: Epistaxis is a very common medical problem affecting up to 60% of population at a point of their life. The classic lines of treatment of significant epistaxis include, vessel compression by packing or similar maneuvers, cauterization using various types of chemicals or heat and ligation or embolization of the bleeding vessel(s). Lauromacrogol is a relatively new compound that has been recently used as a sclerosing material in some vessel-related diseases like varicose veins and Hereditary Hemorrhagic Telengectasia. Objectives: This study compared the efficacy of local sclerotherapy with Lauromacrogol and chemical cautery with chromic acid as treatments for recurrent idiopathic anterior epistaxis in adults. Patients and Methods: Patients were grouped into 2 groups. In group A Lauromacrogol was injected in the submucosa. In group B Chromic acid was applied locally to the surface over the bleeding vessel(s). The primary outcome measure was bleeding control / recurrence d...

Results: This Cross-sectional analytical study was conducted at Gilani Ultrasound Center, Lahore,... more Results: This Cross-sectional analytical study was conducted at Gilani Ultrasound Center, Lahore, Jamiat Hospital and Green town clinic The University of Lahore. Study duration was 9 months. Sample size was 150 patients. Sampling technique used was convenient sampling. All Infertile Females with adnexal mass, age of 18-45 were included in study. Male with infertility were excluded. Ultrasound machine Toshiba xerio with convex transducer frequency range 2.5 to 5 MHz was used.

Chemical Product and Process Modeling, 2020

Despite the importance of natural gas (NG) as an energy source, there is a lot of pressurized lan... more Despite the importance of natural gas (NG) as an energy source, there is a lot of pressurized landfill gas not exploited so far because it contains high CO2 concentration. Therefore, this study aimed to develop a 2-D mathematical model to simulate CO2 removal from NG stream contains high CO2 concentration up to 70% at high-pressure up to 60 bar using three different dimensions of polyvinylidene fluoride (PVDF) hollow fiber membrane contactors. Aqueous solutions of activated methyldiethanolamine (MDEA) with piperazine (PZ) were adopted. The performance of considered absorbent at high-pressure was evaluated at the non-wetting mode condition of membrane contactor. Moreover, the effect of pressure, contact area, gas flow rate, MDEA concentration into the amine mixture, PZ concentration, temperature and membrane properties were theoretically investigated. The findings stated that activated MDEA had different performance in terms of membrane wetting compared with other amines, which used ...

The International Journal of Business & Management, 2019

Impact of Knowledge Management Practices on University Lecturers' Performance in Bauchi and Gombe... more Impact of Knowledge Management Practices on University Lecturers' Performance in Bauchi and Gombe States 1. Introduction Over the past few decades, the need for information and development of knowledge in organizations has progressed from an evolving concept to increasingly essential activities in virtually every organization. This is as result of a shift in strategic thinking from the resource-based view of the firm to the knowledge-based view. Knowledge is considered an organization's most strategic resource and one of the most highly valued commodity in the modern economy (Tajali, Farahani & Baharvand, 2014; Hegazy & Ghorab, 2014). In order to keep abreast with the rapid societal changes, educational institutions especially at the tertiary level, need to understand and master the art of effective creation, collection, dissemination, application and sharing of information (Krubu& Krub, 2011)in ways that strive to improve performance at both individual and organizational level(Oliver, Handzic, & Van Toorn, 2003; Cheng, Ho, & Lau, 2009). One possible way to do so is to ensure that those concerned with managing knowledge are to make certain that the right knowledge get to the right people just in time (Snowden, 2002). The universities are considered as "Knowledge Houses" where knowledge flows among lecturers and down to students through teaching, learning and research and new knowledge is created. Like other organizations, Universities thrive to stay relevant in this knowledge society (Loh, et al., 2003). Any institution of learning is considered relevant due to its all-embracing commitment to knowledge. Lecturers are regarded as the most vital resources of the universities and equally their performance is an important issue in the light of increasing demand for knowledge in the current economy. Effective lecturers' performance remains one of the major determinants of any educative process in the universities

Egyptian Journal of Neck Surgery and Otorhinolaryngology, Nov 1, 2019

Egyptian Journal of Neck Surgery and Otorhinolaryngology, 2020

$Research paper thumbnail of Transpterygoid versus Endoscopic Infracochlear Approaches to the Petrous Apex: A Comparative Cadaveric Study$

29th Annual Meeting North American Skull Base Society, 2019

The clinical teacher, Jan 21, 2017

International journal of biological macromolecules, Jan 29, 2017

Stimuli responsive biomaterials offer a unique advantage over traditional local drug delivery sys... more Stimuli responsive biomaterials offer a unique advantage over traditional local drug delivery systems in that the drug elution rate can be controllably increased to combat developing symptomology or maintain high local elution levels for disease treatment. In this study, superparamagnetic Fe3O4 nanoparticles and the antibiotic vancomycin were loaded into chitosan microbeads cross-linked with varying lengths of polyethylene glycol dimethacrylate. Beads were characterized using degradation, biocompatibility, and elution studies with successive magnetic stimulations at multiple field strengths and frequencies. Thirty-minute magnetic stimulation induced a temporary increase in daily elution rate of up to 45% that was dependent on field strength, field frequency and cross-linker length. Beads degraded by up to 70% after 3 days in accelerated lysozyme degradation tests, but continued to elute antibiotic for up to 8 days. No cytotoxic effects were observed in vitro compared to controls. Th...

International journal of surgery (London, England), 2016

To assess the effectiveness of the Google GLASS as a vital signs monitor in a surgical setting an... more To assess the effectiveness of the Google GLASS as a vital signs monitor in a surgical setting and identify potential uses. This prospective, observational and comparative study recruited novice (n = 24), intermediate (n = 8) and expert urologists (n = 5). All candidates performed a procedure on the GreenLight Simulator within a simulated setting using a standard vital signs monitor and then the Google GLASS. The time taken to respond to abnormal vital signs during both sessions was recorded. A quantitative survey was used to assess the usability and acceptability of the Google GLASS surgery. The majority (84%) of participants responded quicker to abnormal signs with the Google GLASS compared to a standard monitor (p = 0.0267). The average simulation score during a standard-monitor and GLASS-session scored to be statistically insignificant (p = 0.253). All parameters of simulation were also similar in both sessions including average sweep speed (p = 0.594), average blood loss (p = 0...

The Clinical Teacher, 2016