22 results on '"Ahmed, Majid"'
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2. Investigation on factors causing construction delay and their effects on the development of Oman’s construction industry
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Javed, Shakila, Hussain, Mohammed Ihtesham, Al Aamri, Ahmed Majid, and Akhtar, Javed
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construction industry ,construction delay ,General Engineering ,General Physics and Astronomy ,Covid-19 ,Labor ,client ,contractor - Abstract
Construction delay in projects is a common manifestation in the construction industry. Delay in construction will lead to a bad relationship between the parties involved and will also lead to an increase in the allocated completion time. Delay in the ongoing project might result in the loss of the money, time and other facilities by the client and cause a lot of financial damage to the contractor due to its investment in the purchase of equipment, construction materials and the hire of skilled workers. Delay in construction is a common problem that occurs mostly due to the unforeseen problems during the design & construction stages which often lead to delays in the completion of the project. Oman’s construction industry is one of the most important industries for the country’s economic development and growth. In this study, analysis of some available literature was conducted, and a questionnaire survey was floated among contractors, consultants, clients, project managers, and engineers involved in construction projects. All the collected responses were evaluated by using SPSS. The results of the study identified a total of 60 causes of delay out of which three factors have a “High” significance level for construction delays. These factors of “High” significance were associated with “Client related issues only” in which the initial design was altered by the client, delaying in deciding by the client and, scope change by the client. Majority of the delay (84 %) was observed to be lying in the range of 1‑2 years. This study also recognized the effect and minimization of regular delay and delay resulted due to Covid-19. Minimizing construction delay criteria can be managed by having a proper control system in the project time and funds
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- 2022
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3. INVESTIGATION OF ASYMPTOMATIC BACTERIURIA IN A GROUP OF IRAQI PATIENTS WITH DIABETES MELLITUS TYPE 2 IN BAGHDAD CITY, IRAQ
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Safana Khamis Ahmed, Ahmed, Amani Karim Diab, Saadallah Mansour Kanauf, Ahmed Majid Ali, Hawra Saadoun Maryoush, Rawa Nabil Dawah, and Falah Salim Manhal
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Several studies have indicated that asymptomatic bacteriuria (ASB) is a frequent condition in diabetics and may lead to more severe urinary tract infections (UTIs). This study was conducted to determine the frequency of ASB in patients with type 2 diabetes mellitus as well as the identification of the bacterial etiology of ASB in addition to the antibiotic sensitivity profile in a group of Iraqi patients. A total of 100 individuals were included in this study, 50 diabetic outpatients and 50 non-diabetics as a control group. Mid-stream urine specimens were collected from patients and tested using the urine dipstick test, microscopy and culture tests. It was shown that 90% of diabetic patients were culture positive and 10% were culture negative for bacteria. On the other hand, it was observed that 90% of non-diabetics had no bacterial growth in their urine specimens. The most isolated organisms were Staphylococcus aureus (34%), Enterobacter aerogenes (28%), and Klebsiella spp (10%). It was observed that S. aureus was completely resistant to ampicillin (100%), while only 30% of these isolates were resistant to ciprofloxacin. It was noted that S. aureus was the most isolated in the study, which is a clear change in the spectrum of the causative agent of these cases. Given the high prevalence of ASB in patients with type 2 diabetes, this study recommends that the diagnostic program for diabetic patients should include bacterial culture of their urine specimens to determine the antimicrobial resistance of isolated bacteria.
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- 2022
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4. A Comparative Investigation on Normal and High Strength Concrete Beams under Torsion
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Ihtesham Hussain Mohammed, Ahmed Majid Salim Al Aamri, Shakila Javed, and Yahya Ubaid Al Shamsi
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Mechanics of Materials ,Mechanical Engineering ,General Materials Science ,Condensed Matter Physics - Abstract
In this study, an experimental investigation was done to study the behaviour of Normal Strength Concrete (NSC) and High Strength Concrete (HSC) Plain beams under torsion with the concrete mix of M40 and M100. No mineral admixtures are used to obtain the required strength of concrete. Eight NSC beams and eight HSC beams whose width was varying with 75 mm, 100 mm, and 150 mm; depth varying as 75 mm, 100 mm, 150 mm and 200 mm; and span of the beams varying 600 mm, 800 mm and 1200 mm were casted and cured to stud the effect of torsion. The principle aim of this study was to understand the torsional behaviour of the NSC and HSC beams for rotation, cracking, size effect and torsional strength. A standard torsional loading method was used for conducting the testing of beams. The results obtained were compared with different theories and code equations. It was observed that the torsional strength of the beam increases with the increase in strength of concrete. HSC beams have higher torsional strength than the NSC beams which has the same amount of reinforcement.
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- 2022
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5. First Reported Cochlear Implantation in a Child with Total Artificial Heart
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Zahide Çiler Büyükatalay, Ahmet Rüçhan Akar, Ahmed Majid Naji Agha Oghali, Tayfun Uçar, Tanıl Kendirli, Cem Meco, and Özlem Selvi Can
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Pediatric intensive care unit ,Transplantation ,medicine.medical_specialty ,Rehabilitation ,business.industry ,Hearing loss ,medicine.medical_treatment ,Intensive care unit ,law.invention ,law ,Cochlear implant ,Artificial heart ,Emergency medicine ,Medicine ,Implant ,medicine.symptom ,business ,Elective Surgical Procedure - Abstract
We report a case of 15-year-old boy with postlingual bilateral total hearing loss following ototoxic medication during his pediatric intensive care unit stay. The patient received the SynCardia total artificial heart implant (50 mL; SynCardia Systems, Inc., Tucson, AZ, USA) for end-stage biventricular heart failure as a bridge to heart transplant. During his time on the urgent heart transplant wait list, he underwent successful cochlear implantation following optimized coagulation and hemostasis status and appropriate anesthetic preparation. Our case represents the world's first successful cochlear implant in a pediatric patient who received an artificial heart. Despite complexities in this patient population, elective surgical procedures can be performed safely with acceptable morbidity using a collaborative approach with the heart transplant team, including input from cardiovascular surgery, pediatric cardiology, anes thesiology, consultation-liaison psychiatry, physical therapy and rehabilitation, infectious diseases and clinical microbiology, and intensive care unit staff.
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- 2021
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6. Sustainable landfill design for effective municipal solid waste management for resource and energy recovery
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S. Arunachalam, Aliya Ali Said Al Alawi, Ahmed Majid Salim Al Aamri, K. Parameswari, K. Gopalakrishnan, and T. Sivasakthivel
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010302 applied physics ,Pollution ,Energy recovery ,Municipal solid waste ,Waste management ,Compost ,media_common.quotation_subject ,Biomass ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,01 natural sciences ,Sustainable management ,0103 physical sciences ,engineering ,Leachate ,0210 nano-technology ,media_common ,Resource recovery - Abstract
Municipal solid waste disposal poses a serious issue to the environment and human health. Technical measures along with management actions are essential for sustainable management of municipal solid waste. Design of engineered landfill is considered as technical measures and management measures such as segregation of waste as organic and inorganic can be considered as an effective waste management strategy. The present study aims to investigate Municipal Solid Waste landfill parameters to design an engineered landfill. The primary objective was to reduce the negative effects of municipal solid waste on the environment by designing an engineered landfill that complies with the technical requirements. A proper site has been chosen to dump the solid waste generated in Muscat by analyzing the geology, lineament, and contour map of the study area. The proposed landfill is located in Al Jafnayn, Muscat Governorate, Sultanate of Oman. The proposed landfill area is around 72,890 m2. The design of a conventional landfill without segregation of waste fails to reach the goal of resource recovery and energy generation. The present study suggests a modified landfill design with organic and inorganic cells useful for biomass energy recovery and compost generation. The landfill area is stratified into organic and inorganic cells to reach the goal of resource recovery and energy generation. The compost generated from the segregated cells can be used for agriculture which will reduce the usage of fertilizers, enhances country economical condition and protect the environment from pollution. The leachate collection drainage system has been designed by assessing the quantity and volume of leachate by using the Swiss method. Proper solid waste management is necessary for energy recovery and thereby reduces the pollution load to the environment.
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- 2021
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7. أعلامُ مدرسةِ القراءاتِ في سامراءَ ومعالمِها دراسة في كتاب غاية النهاية لابن الجزري (ت 833هـ)
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Salah Sayer Farhan and Obaida Ahmed Majid
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تعدُّ مدينةُ سامراء مِن حواضرِ الإسلامِ ومدنهِ المشهورةِ، فهي منذُ تأسيسِها زمنَ الخلافةِ العباسيةِ دارُ علمٍ، وفقهٍ وإقراءٍ، وحديثٍ، وقد ظهرَ فيها الكثيرُ مِن علماءِ القراءاتِ ومقرئِيها، وهذا البحثُ يعنى بالدرجةِ الأساسِ ببيانِ أبرزِ أعلامِ مدرسةِ سامراءَ في القراءاتِ والتعريفِ بِهم، وإظهارِ المعالمِ الأُولى لهذهِ المدرسةِ في علمِ القراءاتِ القرآنيةِ متخذينَ من كتابِ (غايةِ النهايةِ في طبقاتِ القُرّاءِ للحافظِ ابنِ الجزري) إطاراً زمانياً، ومكانياً لهُ. وحرصَ الباحثانِ على توخِي الدقّةِ في نقلِ المعلوماتِ، واتّباعِ المنهجِ الوصفيِّ في إيرادِها، والمنهجِ التحليليِّ في استنطاقِها، ومحاولةِ الوصولِ إلى بعضِ الحقائقِ العلميةِ، والتاريخيةِ ممّا لهُ علاقةٌ بمدينةِ سامراءَ، وواقعِ القراءاتِ القرآنيةِ فيها.
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- 2020
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8. Mid-length Pedicle Screws in Posterior Instrumentation of Scoliosis
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Tevfik Balıkçı, Görkem Kiyak, Motasim Khalid Bawaneh, Ahmed Majid Heydar, and Murat Bezer
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musculoskeletal diseases ,Chord length ,Radiography ,Convex side ,lcsh:Medicine ,Pedicle ,Scoliosis ,Insertion depth ,03 medical and health sciences ,Thoracic region ,0302 clinical medicine ,medicine ,Orthopedics and Sports Medicine ,Pedicle screw ,Orthodontics ,030222 orthopedics ,business.industry ,Screw ,lcsh:R ,equipment and supplies ,musculoskeletal system ,medicine.disease ,surgical procedures, operative ,Anterior cortex ,Clinical Study ,Surgery ,Posterior instrumentation ,business ,030217 neurology & neurosurgery - Abstract
Study Design Prospective analysis of collected data. Purpose We determine the need for the use of mid-length pedicle screws (screws with 2.5-mm long increments) during posterior spinal instrumentation. Overview of Literature Many biomechanical studies have been performed showing that increasing the pedicle screw insertion depth provides an improved resistance to pullout, cyclic loading, and derotational forces, but no intermediate length screws were used. Methods We prospectively evaluated 120 patients who received posterior segmental instrumentation for structural scoliosis. Preoperatively, 91.44-cm long cassette anteroposterior (AP), lateral, and AP bending radiographs and multiplanar computed tomography were performed in all patients routinely. We measured chord length to determine the maximum probable screw length of all vertebrae. All pedicle screws were attempted to be placed as long as possible. The main intention was at least to engage the subcortical bone of the anterior vertebral cortex. Especially in the apical region, the screws were attempted to be inserted bicortically. The length, level, region, and side of each screw were recorded. Screws with 5-mm increments were called standard length screws (SLS), and middle-sized screws with 2.5-mm increments were called mid-length screws (MLS). Results Of 2,846 pedicle screws inserted, 1,575 (55.4%) were SLS and 1,271 (44.6%) were MLS, demonstrating a need for MLS in scoliosis surgery (p
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- 2019
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9. Epidemiological Profile of Pediatric Ear Nose Throat Emergencies
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Ridvan Kiliç, Zahide Çiler Büyükatalay, Sibel Yıldırım, Ahmed Majid Naji Agha Oghali, and Gürsel Dursun
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lcsh:R5-920 ,medicine.medical_specialty ,business.industry ,Emergency ,Epidemiology ,medicine ,lcsh:Medicine (General) ,business ,Pediatrics ,Trauma ,Dermatology ,Foreign Body ,Ear nose throat - Abstract
Objectives:Ear, nose and throat (ENT) diseases are among the most common pathologies in the community, some of which may have high morbidity and mortality if early diagnosis and appropriate treatment approaches are not applied. Pediatric patients form an important part of emergency department admissions. The emergency diseases observed in children are different from the adult patient group and the diagnosis and treatment approaches differ accordingly. The aim of this study is to investigate the epidemiological features and approach methods among the pediatric patients presenting to the emergency department.Materials and Methods:Between 2016 and 2017, the data of 1732 patients younger than 18 years who were referred by the pediatric emergency to ENT department were retrospectively reviewed. Age, gender, admission Complaints, diagnosis, additional diseases, radiological and laboratory tests and treatment approaches were evaluated.Results:Among the patients included in the study, 751 were male (52.4%), 681 were female (47.5%); The average age was 7.2 years. Altı yüz seksen yedi (48.8%) patients were referred for rhinologic reasons, 515 (36.9%) patients had otologic complaints, while 73 (5.09%) patients had oral cavity and 44 (3.5%) patients had head and neck region related complains. The number of hospitalized patients was 41 (2.86%) patients. Yirmi dokuz (2.02%) patients were treated with surgical intervention.Conclusion:The majority of patients presenting with ENT related complains to pediatric emergency services may be examined and treated in the emergency unit without referring to ENT department. Most of the referred patients complain from simple trauma, minor epistaxis or simple infections. However, patients presenting with severe trauma or a foreign body that can cause aspiration should be evaluated as soon as possible and treated accordingly.
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- 2019
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10. Effect of Bidirectional Reflector Technology on the Non-line-of-sight propagation of Light Fidelity System
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Ahmed Majid Hameed and Satea H. Alnajjar
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Computer science ,business.industry ,Reflector (antenna) ,Signal ,law.invention ,Power (physics) ,Non-line-of-sight propagation ,Optics ,law ,Q factor ,Bit error rate ,business ,Light-emitting diode ,Diode - Abstract
Light fidelity is a future technology due to significant advancements in Light-Emitting Diodes (LEDs) and visible-light communication. Existing LEDs for illumination in homes, factories, offices, and streets have large bandwidths, are secure, and exhibit high data rates; hence, LED has recently attracted considerable attention. This study investigates the effects of a bidirectional reflector technology on the vulnerability of received signals from five LEDs due to the nonline of sight that occurs because of walls of a standard room with a dimension of 5 × 5 × 3 m; the proposed indoor system supports a 1-Gbps data rate. The system was evaluated in phrases of the bit error rate, quality factor, signal power, and electrical signal-to-noise ratio. The effect of the irradiance angle variation on the quality factor and bit error rate of the signal was demonstrated in reflectivities of approximately 99% and 0.8%. Bidirectional reflector technology was used to enhance the system’s performance due to the dispersion of the received signal. Therefore, this technology demonstrated its ability to correct reflected signals.
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- 2021
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11. Ortopedi ve travmatolojide kullanılan implantların CE belgelendirilmesi
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Serdar Şirazi and Ahmed Majid Heydar
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- 2021
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12. Conservation of Forests Using Satellite Imaging
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Asaad A. M. Al-Salih and Ahmed Majid Bahri
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business.industry ,Deforestation ,Sustainable management ,Global warming ,Environmental resource management ,Climate change ,Environmental science ,Environmental pollution ,Satellite imagery ,business ,Greenhouse effect ,Natural resource - Abstract
Clearing of forests and burning of oil-origin fuels have enhanced the Earth’s natural greenhouse effect on our planet. The motivation behind this work is to control such an effect that is widely deemed to be crucial in maintaining life on earth. This effect causes global warming besides increasing environmental pollution due to the harmful carbon dioxide (CO2) emission. Remarkable applications of geospatial technologies have thus been clearly noticed in the relevant field of remote sensing. Such application has been justifiably witnessed in the rapid spatiotemporal monitoring of forest resources. This in turn has participated in the formulation of substantial strategy outlines to set the sustainable management of these forests. Many countries of the world are now heavily working to protect trees and conserve forests. Satellite imaging can hereby be a very efficient way for this purpose. The objective of this paper is to propose a model that uses satellite imaging with Google Earth application to protect forests from being cleared. The pertinent methodology of this model is conceptually based on the method of edge detection. The paper discusses the issues of satellite image acquisition and processing besides the international REDD+ forest conservation program for such protection. The governmental role in providing resources to protect this natural resource has further been highlighted. Using satellite imagery for the conservation of forest and protecting trees from being cut, the anticipated outcome of the proposed model is envisaged to achieve better results that are much “faster” and more “accurate” than the other available approaches. In addition to forests’ conservation, the application field of this work encompasses diverse issues like overcoming environmental and climate changes, diminishing deforestation, and defeating desertification.
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- 2021
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13. Do Magnetically Controlled Growing Rods Stimulate Longitudinal Vertebral Growth in Early-Onset Scoliosis Patients?
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Görkem Kiyak, Ali Erkan Yenigul, Erhan Okay, Serdar Şirazi, Tevfik Balıkçı, Ahmed Majid Heydar, and Murat Bezer
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Male ,Osteogenesis, Distraction ,Scoliosis ,03 medical and health sciences ,Magnetics ,0302 clinical medicine ,Lumbar ,medicine ,Deformity ,Humans ,In patient ,Child ,Orthodontics ,VERTEBRAL DEFORMITY ,business.industry ,medicine.disease ,Spine ,Vertebra ,medicine.anatomical_structure ,Treatment Outcome ,030220 oncology & carcinogenesis ,Child, Preschool ,Surgery ,Female ,Neurology (clinical) ,medicine.symptom ,Growth stimulation ,Early onset scoliosis ,business ,030217 neurology & neurosurgery - Abstract
Objective Distraction-based systems are the most common systems used in the treatment of early-onset scoliosis. In addition to its corrective and deformity progression preventive properties, its vertebral growth stimulation effect has been proved. Recently popularized magnetically controlled growing rods (MCGRs) showed superior results in terms of outcomes and decreased complication rate. Its vertebral growth stimulation effect has not been studied. The aim of the study is to evaluate the vertebral growth stimulation effect in patients treated with MCGR. Methods Patients with progressive scoliosis treated by dual MCGR, who had no obvious lumbar vertebral deformity and had a regular 3-month interval spinal lengthening for at least 30 months, were subdivided into 2 groups according to the inclusion of L3 vertebra within instrumentation segments. The L3 vertebral vertical and horizontal lengths were measured postoperatively and at the last follow-up, and their differences were analyzed statistically in both groups. Results Twenty-four patients were included; 18 of them had an L3 vertebra outside instrumentation segments, while the other 6 had spanned by MCGR. Uninstrumented L3 were followed up for an average of 36 months. The height difference between initial postoperative examination and the last follow-up was 3.55 mm ± 0.63 mm, and the width difference was 3.85 mm ± 0.75 mm. Conversely, patients with instrumented L3 were followed up for a mean of 38.9 months. Their initial postoperative examination and last follow-up differences in height and width were 6.91 mm ± 1.11 mm and 3.66 mm ± 0.92 mm, respectively. Conclusions Frequent distractions stimulate longitudinal vertebral growth in vertebrae spanned by MCGR.
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- 2020
14. Short Segment Spinal Instrumentation in Early-onset Scoliosis Patients Treated With Magnetically Controlled Growing Rods
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Erhan Okay, Ahmed Majid Heydar, Serdar Şirazi, Murat Bezer, and Görkem Kiyak
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Male ,medicine.medical_specialty ,Adolescent ,Kyphosis ,Scoliosis ,Thoracic Vertebrae ,03 medical and health sciences ,0302 clinical medicine ,Humans ,Medicine ,Orthopedics and Sports Medicine ,Postoperative Period ,Prospective Studies ,Age of Onset ,Child ,030222 orthopedics ,Spinal instrumentation ,Cobb angle ,business.industry ,medicine.disease ,Internal Fixators ,Surgery ,Vertebra ,Radiography ,Spinal Fusion ,Treatment Outcome ,medicine.anatomical_structure ,Child, Preschool ,Short segment ,Radiological weapon ,Magnets ,Female ,Neurology (clinical) ,business ,Early onset scoliosis ,030217 neurology & neurosurgery - Abstract
STUDY DESIGN A prospective, a single-institution, nonrandomized study. OBJECTIVE The aim of this study was to evaluate the safety and effectivity of short-segment instrumentation in early-onset scoliosis (EOS) patients treated by magnetic-controlled growing rods (MCGRs). SUMMARY OF BACKGROUND DATA Despite the common use of conventional growing rods and the recent popularity of MCGR in the treatment of progressive EOS, distal instrumented vertebra and number of the spanned levels are not standardized. METHODS Patients with progressive EOS, characterized by the major thoracic curve and nonstructural compensatory curve, were a candidate to be treated by dual MCGR short segment spinal instrumentation spanning the major thoracic curve; such patients are followed up for a minimum period of 30 months. Radiological data were collected and analyzed in terms of Cobb angle of both primary and secondary curve, kyphosis angle, T1-T12, and T1-S1 distances, and T1-T12/T1-S1 ratio in preoperative, postoperative, and last follow-up. RESULTS Sixteen patients with different diagnoses of EOS, mean age at the operation was 7 years and 10 months (5 years and 6 months-9 years and 10 months), and mean period of follow-up was 37 (30-54) months. The Cobb angle of both major and compensatory curve are corrected by the mean value of 62° (44-85), 35° (22-45) preoperatively to 29° (12-49), 14° (9-24) postoperatively, and maintained at 28° (10-47), 10° (2-20) in the last follow-up, respectively. The T1-T12/T1-S1 ratio was 0.58 preoperatively, 0.6 postoperatively, and 0.62 at the last follow-up. The average yearly T1-T12 and T1-S1 length increase were calculated as 7 and 9 mm/year, respectively. CONCLUSION Selective fusion principals are applicable to EOS, in that short segment instrumentation with MGCR in thoracic curve EOS patients is an effective technique in correction of both structural and compensatory curve, and in maintaining the correction during subsequent nonsurgical spinal distraction. LEVEL OF EVIDENCE 4.
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- 2017
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15. Magnetic Controlled Growing Rods as a Treatment of Early Onset Scoliosis
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Ahmed Majid Heydar, Serdar Şirazi, and Murat Bezer
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Male ,medicine.medical_specialty ,Kyphosis ,Last follow up ,Magnetics ,03 medical and health sciences ,0302 clinical medicine ,Deformity ,medicine ,Humans ,Orthopedic Procedures ,Orthopedics and Sports Medicine ,Prospective Studies ,Age of Onset ,Child ,Retrospective Studies ,High rate ,030222 orthopedics ,Cobb angle ,business.industry ,Background data ,medicine.disease ,Surgery ,Treatment Outcome ,Scoliosis ,Early results ,Child, Preschool ,Female ,Neurology (clinical) ,medicine.symptom ,Early onset scoliosis ,business ,030217 neurology & neurosurgery ,Follow-Up Studies - Abstract
STUDY DESIGN Prospective unicentral nonrandomized study. OBJECTIVE To evaluate the safety and effectivity profile of magnetic controlled growing rods (MCGR) in patients with early onset scoliosis (EOS). SUMMARY OF BACKGROUND DATA Conventional growing rods are the most commonly used growth sparring devices in the treatment of EOS, as this technique requires repeated surgical operations for lengthening; it is associated with high rate of complications and increased costs. MCGR in treatment of EOS is effective in correcting deformity whereas allowing continuous spinal growth as reported by a few studies. METHODS A total of 18 patients with progressive EOS were treated by MCGR, two of them had undergone final fusion operation. Patients were followed-up for a minimium time of 9 months from the time of initial surgery. Radiological data were analyzed in terms of Cobb angle, kyphosis angle, T1-T12, and T1-S1 distances in preoperative, postoperative, and last follow up. RESULTS The mean preoperative Cobb and kyphosis angle were 68° (44-116°) and 43° (98-24°), it was corrected to 35° (67-12°) and 29° (47-21°) immediately after initial operation and maintained at 34.5° (52-10°) and 33° (52-20°) at last follow up, respectively.The mean preoperative T1-T12 and T1-S1 distance were 171 mm (202-130 mm) and 289 mm (229-370 mm), it was increased to 197 mm (158-245 mm) and 330 mm (258-406mm) immediately after initial operation and further increased to 215 mm (170-260 mm) and 357 mm (277-430 mm) at last follow up, respectively.Two patients had undergone final fusion, they had overall mean Cobb angle correction of 66° (62-70°), and kyphosis angle change of 53° (26-80°). Total height gain in T1-T12 and T1-S1 of 80.5 mm (67-94 mm) and 119 mm (105-133 ), respectively. CONCLUSION MCGR is safe and effective technique in correction of EOS deformity and in maintaining the correction during nonsurgical distraction procedures. A further correction of the deformity and more spinal height gain can be achieved in the final fusion operation. LEVEL OF EVIDENCE 3.
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- 2016
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16. Multi-Swarm Bat Algorithm
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Ahmed Majid Taha, Soong-Der Chen, and Aida Mustapha
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General Computer Science ,General Engineering - Published
- 2015
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17. Comparison of the Pullout Strength of Different Pedicle Screw Designs and Augmentation Techniques in an Osteoporotic Bone Model
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Ahmed Majid Heydar, Görkem Kiyak, Murat Bezer, Tevfik Balikci, Kiyak, Gorkem, Balikci, Tevfik, Heydar, Ahmed Majid, and Bezer, Murat
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musculoskeletal diseases ,lcsh:Medicine ,Pedicle ,Augmentation ,03 medical and health sciences ,0302 clinical medicine ,Medicine ,FIXATION ,Orthopedics and Sports Medicine ,Load displacement ,POLYMETHYLMETHACRYLATE AUGMENTATION ,VERTEBRAE ,Pedicle screw ,SPINAL SURGERY ,CEMENT AUGMENTATION ,030222 orthopedics ,Expandable ,business.industry ,Screw ,lcsh:R ,Screw head ,Pullout strength ,Basic Study ,musculoskeletal system ,equipment and supplies ,Bone screws ,medicine.anatomical_structure ,surgical procedures, operative ,Osteoporotic bone ,Loading rate ,Osteoporosis ,Surgery ,INJECTION ,business ,Cancellous bone ,030217 neurology & neurosurgery ,Biomedical engineering - Abstract
Study DesignMechanical study.PurposeTo compare the pullout strength of different screw designs and augmentation techniques in an osteoporotic bone model.Overview of LiteratureAdequate bone screw pullout strength is a common problem among osteoporotic patients. Various screw designs and augmentation techniques have been developed to improve the biomechanical characteristics of the bone–screw interface.MethodsPolyurethane blocks were used to mimic human osteoporotic cancellous bone, and six different screw designs were tested. Five standard and expandable screws without augmentation, eight expandable screws with polymethylmethacrylate (PMMA) or calcium phosphate augmentation, and distal cannulated screws with PMMA and calcium phosphate augmentation were tested. Mechanical tests were performed on 10 unused new screws of each group. Screws with or without augmentation were inserted in a block that was held in a fixture frame, and a longitudinal extraction force was applied to the screw head at a loading rate of 5 mm/min. Maximum load was recorded in a load displacement curve.ResultsThe peak pullout force of all tested screws with or without augmentation was significantly greater than that of the standard pedicle screw. The greatest pullout force was observed with 40-mm expandable pedicle screws with four fins and PMMA augmentation. Augmented distal cannulated screws did not have a greater peak pullout force than nonaugmented expandable screws. PMMA augmentation provided a greater peak pullout force than calcium phosphate augmentation.ConclusionsExpandable pedicle screws had greater peak pullout forces than standard pedicle screws and had the advantage of augmentation with either PMMA or calcium phosphate cement. Although calcium phosphate cement is biodegradable, osteoconductive, and nonexothermic, PMMA provided a significantly greater peak pullout force. PMMA-augmented expandable 40-mm four-fin pedicle screws had the greatest peak pullout force.
- Published
- 2017
18. Sex differences in the association of cutaneous melanoma incidence rates and geographic ultraviolet light exposure
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Liu-Smith, Feng, Farhat, Ahmed Majid, Arce, Anthony, Ziogas, Argyrios, Taylor, Thomas, Wang, Zi, Yourk, Vandy, Liu, Jing, Wu, Jun, McEligot, Archana J, Anton-Culver, Hoda, and Meyskens, Frank L
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Adult ,Male ,Skin Neoplasms ,Adolescent ,Ultraviolet Rays ,Clinical Sciences ,and over ,Young Adult ,Sex Factors ,Clinical Research ,80 and over ,melanoma ,Humans ,sex ,Climate-Related Exposures and Conditions ,Registries ,Child ,Preschool ,Aged ,Cancer ,Incidence ,age-standardized rates ,Dermatology & Venereal Diseases ,Age Factors ,Australia ,Infant ,Environmental Exposure ,Middle Aged ,Newborn ,United States ,Europe ,gender difference ,Female ,UVI ,New Zealand ,UV index - Abstract
© 2016 American Academy of Dermatology, Inc. Background Cutaneous melanoma (CM) incidence rates continue to increase, and the reasons are unknown. Previously, we reported a unique age-specific sex difference in melanoma that suggested additional causes other than solar ultraviolet (UV) radiation. Objective This study attempted to understand whether and how UV radiation differentially impacts the CM incidence in men and women. Methods CM data and daily UV index (UVI) from 31 cancer registries were collected for association analysis. A second dataset from 42 US states was used for validation. Results There was no association between log-transformed female CM rates and levels of UVI, but there was a significant association between male rates and UVI and a significant association between overall rates and UVI. The 5-year age-specific rate–UVI association levels (represented by Pearson's coefficient ρ) increased with age in men, but age-specific ρ levels remained low and unchanged in women. The significant rate–UVI association in men and nonassociation in women was validated in a population of white residents of the United States. Limitations Confounders, including temperature and latitude, are difficult to separate from UVI. Conclusions Ambient UVI appears to be associated with melanoma incidence in males but not in females.
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- 2017
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19. Company attendance and access control system based on radio frequency identification
- Author
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Qusay shihab hamad, Ahmed Majid Taha, and Atheer Akram Abdulrazzaq
- Subjects
History ,Database ,business.industry ,Computer science ,Attendance ,Access control ,computer.software_genre ,Profit (economics) ,Computer Science Applications ,Education ,Microcontroller ,Radio-frequency identification ,business ,computer - Abstract
one of the popular things among succeeded companies is an automated system. The reasons behind using the automated system are to reduce human errors, work and to gain efficiency. The design focused on building an automated system for access control and attendance monitoring by the use of RFID technology. all the companies that still doing mural attendance will get a great help when it used the proposed system. this paper used RFID (tags, reader), microcontroller to collect data, ZigBee technology for transmitting and receiving data wirelessly, computer as a control station. the program at control station was written by using Visual C# and connect with database (DB) MSSQL server to store employees’ numbers (RFID tags) and used for attendance calculations. The initial results of the proposed system appear a high profit in time-saving and cost when compared with traditional systems. cost divided into two parts, firstly: a price of ZigBee device, secondly: security men
- Published
- 2019
- Full Text
- View/download PDF
20. Naive Bayes-Guided Bat Algorithm for Feature Selection
- Author
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Aida Mustapha, Ahmed Majid Taha, and Soong Der Chen
- Subjects
Article Subject ,Computer science ,Feature extraction ,Stability (learning theory) ,lcsh:Medicine ,Feature selection ,Machine learning ,computer.software_genre ,lcsh:Technology ,General Biochemistry, Genetics and Molecular Biology ,Pattern Recognition, Automated ,k-nearest neighbors algorithm ,Naive Bayes classifier ,Artificial Intelligence ,Biomimetics ,Chiroptera ,Animals ,lcsh:Science ,Bat algorithm ,General Environmental Science ,lcsh:T ,business.industry ,lcsh:R ,Bayes Theorem ,Pattern recognition ,General Medicine ,Feature (computer vision) ,Echolocation ,Pattern recognition (psychology) ,lcsh:Q ,Artificial intelligence ,business ,computer ,Algorithms ,Research Article - Abstract
When the amount of data and information is said to double in every 20 months or so, feature selection has become highly important and beneficial. Further improvements in feature selection will positively affect a wide array of applications in fields such as pattern recognition, machine learning, or signal processing. Bio-inspired method called Bat Algorithm hybridized with a Naive Bayes classifier has been presented in this work. The performance of the proposed feature selection algorithm was investigated using twelve benchmark datasets from different domains and was compared to three other well-known feature selection algorithms. Discussion focused on four perspectives: number of features, classification accuracy, stability, and feature generalization. The results showed that BANB significantly outperformed other algorithms in selecting lower number of features, hence removing irrelevant, redundant, or noisy features while maintaining the classification accuracy. BANB is also proven to be more stable than other methods and is capable of producing more general feature subsets.
- Published
- 2013
- Full Text
- View/download PDF
21. Effect of γ-Radiation on Thermal and Chemical Properties of Starch/Polystyrene Biopolymer Blend
- Author
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Ahmed Majid, Zuhair J. Abdul Amer, and Jaheel K. Ahmed
- Subjects
Materials science ,Starch ,technology, industry, and agriculture ,Biomedical Engineering ,food and beverages ,Bioengineering ,engineering.material ,chemistry.chemical_compound ,Differential scanning calorimetry ,chemistry ,Chemical engineering ,Amylose ,Amylopectin ,Polymer chemistry ,engineering ,Polystyrene ,Biopolymer ,Fourier transform infrared spectroscopy ,Glass transition ,Biotechnology - Abstract
In this study, the starch/polystyrene (PS) biopolymer blend is prepared by utilizing an in solution polymerization process. Two different ratios (50/50 and 80/20) of starch/PS were dissolved in toluene associated with mechanical mixing to maintain the homogeneity of the blend. Thereafter, the blend was exposed to γ-radiation using Cobalt 60 (Co60) at different dosing rates. The thermal and chemical properties were investigated by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), enzymatic degradation, and disclosure of starch by iodine, respectively. The deviation of glass transition temperature (Tg ( and the IR peaks indicate that a good interaction between starch and polystyrene was achieved in the blend. Exposure of the starch/PS blend to the α-amylase enzyme and to iodine demonstrated that the γ-rays have affected the amylopectin part with no distinct effect on the amylose part of the starch. Moreover, the colour has completely disappeared at 100 kGray irradiation dose since the blend becomes more responsive to enzymatic degradation at higher irradiation dose, which in turn causes in breaking down of the amylose part in the starch.
- Published
- 2012
- Full Text
- View/download PDF
22. Variability and Relationship Between Morpho-phenological Traits and Grain Yield in Winter and Facultative Barley under Stress Environments
- Author
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Zaheer Ahmed, Moizza Tahir, A Iftikhar Ahmed Majid, N.S. Kisana ., S. Zahid Mustafa ., and M.Y.Mujahid .
- Subjects
Facultative ,biology ,Agronomy ,Phenology ,Grain yield ,Morpho ,biology.organism_classification ,Agronomy and Crop Science - Published
- 1999
- Full Text
- View/download PDF
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