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5 results on '"Ali Falah Hassan"'

1. Nonlinear Quantum Dot Light Emitting Diode Dynamics and Synchronization with Optoelectronic Feedback

Author

Methag Abdalwahed Kadim, Sadeq ajeel, Ali Natheer Tuaimah, Ali Falah Hassan, Sora F. Abdalah, kais al naimee, Riccardo Meucci, amin alkhursan, Ali. H. Khidhir, and Hussein ALHusseini

Subjects
Physics, QC1-999, Biology (General), QH301-705.5, Chemistry, QD1-999
Abstract

We studies a three-variable dimensionless model for a quantum dot light emitting diode (QD-LED) subject to optoelectronic feedback (OEFB). In dependence of the feedback strength and delay-time we analyze complex bifurcation scenarios for the intensity of the emitted light as well as time series, fast Fourier translate (FFT) and phase plane of all dynamic variables in order to elucidate the dynamics of the light emitting diode. The chaotic dynamic is completely determined by both the variation of the OEFB strength and delay-time of the QD-LED, as evidenced by bifurcation diagram. Our results show that small delay time lead to repeat periodicity of the light emitting towards OEFB. Furthermore, we study chaos synchronization of two QD-LED which are coupled via a unidirectional and bidirectional coupling system. When periodic systems are non-identical, both unidirectional and bidirectional systems depending on the coupling strength parameter the system exhibits completely synchronization. Residual chaos, the mean coherence and entropy are discussed as well.

Published
2023
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2. Collaborative coding multiple access communications

Author

Ali, Falah Hassan

Subjects
621.3822, TK Electrical engineering. Electronics Nuclear engineering
Abstract

This thesis investigates collaborative coding multiple access (CCMA) channel communication schemes. The CCMA schemes potentially permit efficient simultaneous transmission by several users sharing a common channel, without subdivision in time, frequency or orthogonal codes. The main areas of investigation include the information transmission capacity for single and multiple access channels, coding/decoding techniques and practical system design for CCMA schemes. The information transmission capacity of a sampled and quantised single access AWGN channel is developed. It is determined and optimised when the channel input and output are limited by certain practical constraints. These investigations have led to the development and determination of the information transmission capacity of multiple access channels. The capacity of a multiple access channel is studied for two different classes of T-user channel models from both theoretical and practical points of view. It is shown, in principle, that higher transmission rates or, equivalently, more reliable communication than with time sharing is achievable employing the same signalling alphabet. The CCMA schemes, in addition to providing the multiple access function, can also incorporate a certain degree of error control capability. Two main decoding techniques, hard decision and maximum likelihood soft decision, are presented with uniquely decodable CCMA schemes. A new low complexity maximum likelihood decoding technique is described and analysed. Reliability performance of various collaborative codes is studied by simulation employing these decoding techniques. It is shown that uniquely decodable schemes permit the multiple access function to be combined with forward error correction. It is also found that soft decision decoding can provide an energy gain over hard decision decoding. The final area of investigation is a practical CCMA modem system design to combine collaborative coding and modulation. An M-ary frequency shift keying based modulation scheme is described for the T-user CCMA schemes. Three particular types of demodulation techniques, square-law, zerocrossing counting, and quadrature receiver, are described. These techniques are developed in software, tested and evaluated over noiseless and noisy channels.

Published
1992

3. Effect of Local Anesthesia and Extraction on Mouth Opening

Author

Ali Falah Hassan

Subjects
business.industry, Health, Toxicology and Mutagenesis, Significant difference, Inferior alveolar nerve, Toxicology, Trismus, Muscles of mastication, Pathology and Forensic Medicine, Mouth opening, medicine.anatomical_structure, Anesthesia, Medicine, Local anesthesia, medicine.symptom, business, Range of motion, Law, muscle spasm
Abstract

Background: Trismus is defined as painful limitation in mouth opening due to a muscle spasm. Trismus, also called lockjaw, (restricted jaw range of motion).There are various causes of trismus, one is spasm of the muscles of mastication. Assessment of the effect of local anesthesia and extraction on mouth opening ability. Methodology: Total sample of 40 patients included both genders (27 male and 13 female) participated in this study, all Patients were healthy with no allergy to local anesthesia, don’t use alcohol or any drug therapy. Lidocaine HCL 2% with epinephrine 1:80,000 is used to anesthetize the inferior alveolar nerve using IAN block technique, while surgical tools were used for extraction in the usual way. Baseline mouth opening was evaluated pre-operatively, during the effect of local anesthesia and post-operatively by using digital Vernier caliper. Results: significant difference in mouth opening between the measurements (pre-operative, during anesthesia, post-operative) is found , mouth opening decreases when measurement is directed toward postoperatively.

Published
2020
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4. Effectiveness of Educational Program on Pediatric Nurses Toward Communication Management at Al Amara City.

Author

Mohammed, Amjad Hashim, Ali, Falah Hassan, and Mahmud, Huda Shawky

Subjects
*PEDIATRIC nursing, *EDUCATIONAL programs, *INTENSIVE care units, *TEACHING hospitals, *MATURATION (Psychology), *COMMUNICATION in education, *PEDIATRIC nurses
Abstract

Communication in nursing as a professional is normal and unavoidable, and it occurs on a regular basis in healthcare settings. As a result, communication management is critical for organizational success and efficiency, and pediatric nurses must be able to effectively communicated in order to create an environment that fosters personal growth while also ensuring high-quality patient care. Aim: The aim of this study was to assess the skills of staff nurses toward communication management at al amara city Method: Quasi experimental design was undertaken on 70 pediatric nurses who worked in intensive care units linked with the hospital. to AL-sadder teaching hospital in Iraq-Misan. communication management techniques assessment questionnaire was used to collect data. Results: Most studied pediatric nurses had poor in communication management pre-program and the minority had high in managing communication post and after 3 months program implementation. Conclusion: There was a high statistically significant improvement pre-post and after 3 months pediatric nurses skills about communication management. Recommendation: For pediatric nurses, a consistent educational program on communication management should be implemented. [ABSTRACT FROM AUTHOR]

Published
2022

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