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Search Results: 1 - 10 of 630126 matches for " M. S. Ahmad "
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Design and Analysis of MEMS Based Aluminum Nitride (AlN), Lithium Niobate (LiNbO3) and Zinc Oxide (ZnO) Cantilever with Different Substrate Materials for Piezoelectric Vibration Energy Harvesters Using COMSOL Multiphysics Software  [PDF]
Ahmad M. Alsaad, Ahmad A. Ahmad, Qais M. Al-Bataineh, Nermeen S. Daoud, Mais H. Khazaleh
Open Journal of Applied Sciences (OJAppS) , 2019, DOI: 10.4236/ojapps.2019.94016
Abstract: Interest in energy harvesters has grown rapidly over the last decade. The cantilever shaped piezoelectric energy harvesting beam is one of the most employed designs, due to its simplicity and flexibility for further performance enhancement. The research effort in the MEMS Piezoelectric vibration energy harvester designed using three types of cantilever materials, Lithium Niobate (LiNbO3), Aluminum Nitride (AlN) and Zinc Oxide (ZnO) with different substrate materials: aluminum, steel and silicon using COMSOL Multiphysics package were designed and analyzed. Voltage, mechanical power and electrical power versus frequency for different cantilever materials and substrates were modeled and simulated using Finite element method (FEM). The resonant frequencies of the LiNbO3/Al, AlN/Al and ZnO/Al systems were found to be 187.5 Hz, 279.5 Hz and 173.5 Hz, respectively. We found that ZnO/Al system yields optimum voltage and electrical power values of 8.2 V and 2.8 mW, respectively. For ZnO cantilever on aluminum, steel and silicon substrates, we found the resonant frequencies to be 173.5 Hz, 170 Hz and 175 Hz, respectively. Interestingly, ZnO/steel yields optimal voltage and electrical power values of 9.83 V and 4.02 mW, respectively. Furthermore, all systems were studied at different differentiate frequencies. We found that voltage and electrical power have increased as the acceleration has increased.
Haemangioma of the caruncle of the eye
Ahmad S,Hafeez M
Indian Journal of Ophthalmology , 1968,
Long term follow up of ocular lesion of methyl-isocyanate gas disaster in Bhopal
Khurrum M,Ahmad S
Indian Journal of Ophthalmology , 1987,
Abstract: Even today, two years after Bhopal Gas Tragedy thousands of victims continue to suffer from a chronic form of illness with clinical manifestation indicating multisystem involvement This study has been done to evaluate the sequalae of acute ocular lesion of Methyl-Isocyanate gas disaster. In this study 2280 patients who had an active lesion on the exposure of Methyl-isocyanate gas were picked up from the affected area. Another2000 were taken from unaffected area of Bhopal city of the same social status for the purpose of control group.
Aflatoxin production by Aspergillus flavus in competitive environment on mustard seeds
Indian Phytopathology , 2011,
M. Ahmad, N. Ahmad, I. Ahmad, N. Akhtar and S. Ali
Pakistan Veterinary Journal , 2004,
Abstract: In this study 215 buffaloes and 180 cows with the history of repeat breeding and prolonged oestrus period (>24 hours) were used. All of the animals had repeated at least twice. A total of 95 animals (50 buffaloes and 45 cows) were inseminated once, 12-18 hours after the start of oestrus and were kept as control, while 165 buffaloes and 135 cows were divided into two treatment groups. In group I, 70 buffaloes and 55 cows were inseminated twice, first at 12-18 hours after the start of oestrus and then 12-24 hours later. In group II, 95 buffaloes and 80 cows were inseminated once at 12-18 hours after the start of oestrus. These animals were then subjected to forced racing for at least 30 minutes. In control group, 18 buffaloes (36%) and 15 cows (33.33%) were found to be pregnant 60 days after insemination. In treatment group I, 36 buffaloes (51.43%) and 30 cows (54.55%), whereas in group II, 70 buffaloes (73.68%) and 58 cows (72.50%), were observed to be pregnant. These results indicate that forced racing may be a good practical and economical tool to improve conception rate in repeat breeder animals where the problem is due to delayed ovulation.
Comparison between Analytical Solution and Experimental Setup of a Short Long Ytterbium Doped Fiber Laser  [PDF]
M. R. A. Moghaddam, S. W. Harun, H. Ahmad
Optics and Photonics Journal (OPJ) , 2012, DOI: 10.4236/opj.2012.22010
Abstract: In this research, Amplified Spontaneous Emission (ASE) spectrum characteristics for a highly Yb3+ doped glass fiber with different pump powers and pump wavelengths are scrutinized. ASE spectral profile and wavelength shift corresponding to different optical fiber lengths are measured. Highly-doped Yb3+ fiber lasers in a linear-cavity are both experimentally and analytically investigated. Rate equations are solved using quasi-numerical models. Numerical results are reported for wide range of operating conditions to enable design optimization. The model takes into account the scattering loss and the distributed laser loss power density in strongly pump condition. The effects of various parameters such as pump power, pump wavelength, signal wavelength and fiber length on the output power and laser threshold are studied. Theoretical results are shown to be in good agreement with the experimental data.
Protective Effect of Curcumin on Anxiety, Learning Behavior, Neuromuscular Activities, Brain Neurotransmitters and Oxidative Stress Enzymes in Cadmium Intoxicated Mice  [PDF]
Gasem M. Abu-Taweel, Jamaan S. Ajarem, Mohammad Ahmad
Journal of Behavioral and Brain Science (JBBS) , 2013, DOI: 10.4236/jbbs.2013.31008

Cadmium (Cd) exposure can induce acute lethal health-related threats to humans since it has an exceptional ability to accumulate in living organisms and cause toxicological effects. Curcumin (Cur) on the other hand has a wide variety of biological activities and several animal studies have suggested for a potential therapeutic or preventive effects against several ailments and infections. To study the effect of Cur on the toxicity of Cd, sixty Swiss-Webster strain male mice were divided into 6 groups of ten each at random. Group-1 served as the na?ve control and received no treatment. Group-2, 3 and 4 were the experimental controls and were administered once a day with a single oral dose of 50% dimethyl sulphoxide (DMSO), Cur (300 mg/kg) or Cd (100 mg/kg) respectively, for 2 weeks. Group-5 and 6 received Cur and Cd in combination once a day orally for 2 weeks except that Cur in a dose of 150 and 300 mg/kg to group 5 and 6 respectively, was administered one hour before Cd (100 mg/kg) administration to both groups. After treatment period, the animals were subjected to behavioral tests and thereafter, the animals were sacrificed for the estimation of neurotransmitters like serotonin (5-HT), dopamine (DA) and it’s metabolite 3,4-dihydroxyphenylacetic acid (DOPAC) as well as oxidative stress enzymes like lipid peroxides in the form of thiobarbituric acid–reactive substances (TBARS) and total glutathione (GSH) in the forebrain tissue. Cd reduced significantly the body weight gain, the locomotor activity, anxiety behavior in the plus maze and the learning capability (cognitive effect) in the shuttle-box test. Biochemical analysis further revealed that Cd exposure significantly altered the brain neurotransmitters and the oxidative stress enzymes. However, administration of Cur along with Cd had an ameliorating effect on all the behavioral and biochemical parameters studied herein and reduced the toxicity of Cd significantly and dose-dependently. Thus, Cur may be beneficial for anxiety, neuromuscular, and cognitive problems and protect from Cd intoxication.

Colonoscopically Assisted Laparoscopic Polypectomy–An Alternative to Right Hemicolectomy for Large Right-Sided Benign Polyps  [PDF]
A. Z. Kaleem, C. Strachan, L. Whittaker, S. M. Ahmad
Surgical Science (SS) , 2013, DOI: 10.4236/ss.2013.48069

Introduction: Laparoscopic assisted colonoscopic polypectomies have been well described in the literature and are well established in surgical practice, for removal of large, inaccessible, or flat based polyps. Laparoscope allows the endoscopist a serosal viewpoint and thus clear indication of perforation, in addition to enhancing endoscopic positioning through colonic mobilisation, facilitating polypectomy. We describe a previously rarely published technique, in which the colonoscope directs the surgeon to polyps and laparoscopy enables wedge resection of benign polyps using Endo GIA staplers. Using this method, the colonoscope provides an intra-luminal view ensuring adequate excision with margins whilst the laparoscope provides intra-peritoneal access for the wedge resection. Methods: This is a case series of 12 patients with large tubulovillous adenomas, found and biopsied at colonoscopy. Under a general anaesthetic, an on table colonoscopy was performed to identify and reassess the polyp, whilst a laparoscopy was performed to excise the polyp via wedge resection, using the endoscopic view as guidance. Results: The polyp was identified and completely resected in our 12 patients. All patients were discharged on the first post-operative day. Of the polyps excised, a focus of adenocarcinoma was detected in one and an adjacent endocrine tumour was found in another patient in histology along with tubulovillous adenoma. Rest were all tubulovillous adenomas only. Conclusion: We propose that this technique should be regarded as an alternative to Right hemicolectomies and difficult endoscopic mucosal resections for large adenomas, and be regarded as a definitive and safe procedure in its own right.

Evidencing Personal & Professional Development, Perspective of a Surgical Trainee  [PDF]
A. Z. Kaleem, N. Naheed, S. M. Ahmad
Surgical Science (SS) , 2016, DOI: 10.4236/ss.2016.73021
Abstract: Introduction: The author strongly believes that there is a continuous need for personal and professional development in order to keep and improve an individual career path way. It is also imperative to provide evidence of these acquired skills and attributes. According to General medical council, it is a responsibility of every doctor to be competent and up to date. This should be achieved by regularly taking part in activities that maintain and further develop competence and performance. This in turn ensures safety and care to patients [1]. Methodology: The author has had excellent opportunities in his career to participate in diverse personal and professional development programmes. It was important to participate in these programmes to achieve career progression. He would like to share three recent activities from his curriculum vitae which resulted in his significant personal and professional development. The author also had his revalidation last year and found to be fit to practice for next 5 years till next revalidation. The author followed an agreed action plan with his supervisor to accomplish this work. Realistic goals and time frame was set with the help of supervisor. Subsequently, the author had a chance to critically analyse below mentioned three different activities, in order to explore all the achieved learning themes behind these events. The author was fortunate enough to be involved into three different personal and professional development programmes. Firstly, he managed a regional colorectal conference and attained an excellent management experience from that conference. He learnt a lot about better time management. He came to know about different management theories and models and is now able to use these theories for his future management responsibilities. Then he had a communication challenge and difficulty in theatre. He was able to resolve that issue with his strong communication skills. He developed his communication skills and assertiveness with the help of this first-hand experience and different communication models. Lastly, the author had a wonderful opportunity to demonstrate and develop his leadership and team working skills in an International Conference. He realized that leader needs to be a role model for his team and should be leaded by his example. He observed and demonstrated different roles of a leader according to needs of his team. He also learnt about different leadership theories and models. He also acquired a good understanding of a team development. Conclusion: It is extremely important for every health care
Colonoscopy a Real Diagnostic Paragon  [PDF]
A. Z. Kaleem, N. Naheed, S. M. Ahmad
Surgical Science (SS) , 2017, DOI: 10.4236/ss.2017.86028
Abstract: Diagnostic colonoscopy acquires the status of gold standard investigation for evaluation of colonic problems. Formally, colonoscopy was first initiated in June 1969 in America. Colonoscopic history can be traced back to 1958. Matsunaga from Japan was the pioneer as he used a gastrocamera which was the start of colonoscopic era. Flexible sigmoidoscopy was later introduced in 1963. Existing colonic perforation and refusal of a fully compos mentis patient, remain absolute contraindications to diagnostic colonoscopy. Bowel Perforation, although less common, is a disastrous complication of colonoscopy. It is a basic right of any patient who has been offered a colonoscopic procedure to have appropriate, clear and concise information about colonoscopy. Consent literally means permission or an agreement which is granted by a patient to a health care individual to receive examination, test, treatment or intervention. Colonoscopic consent process should be valid and has voluntary, fully informed and capacity aspects as its integral components. There were a lot of oppositions against colonoscopy at that time. It was believed to be dangerous and unnecessary exercise by many surgeons. Time has proved that to be a wrong perception. It is now believed to be an extremely useful diagnostic modality. It is safe procedure in experienced hands and provides valuable clinical information. Colonoscopy is not a pleasant investigation as it is usually related with pain and discomfort by patients; fortunately, good analgesia and safe conscious sedation make this hostile but worthwhile procedure tolerable to patients.Today colonoscopy has kept its status of the gold standard investigation in diagnosing bowel cancer and has prime role in the assessment of majority of large bowel symptoms. Colonoscopy also retains the status of being an investigation with highest sensitivity and specificity, out of all available diagnostic modalities, for identifying adenomatous polyps and now it has acquired a unique status of being a diagnostic paragon.
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