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Search Results: 1 - 10 of 434128 matches for " Masroor H. S. Bukhari "
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RF Field-Driven Electron Tunneling through Mesoscale Junctions  [PDF]
Masroor H. S. Bukhari
Journal of Modern Physics (JMP) , 2017, DOI: 10.4236/jmp.2017.812117
Abstract: Preliminary results of a study are reported here investigating mesoscopic tunnel junctions irradiated with coherent low-intensity (-50 to -10 dB) pulsed microwave RF fields at moderately low (LN2) temperatures. Quantum tunneling of electrons was observed through fabricated mesoscale gap junctions as a result of coherent irradiating fields at low temperatures around 77 - 100 K. The tunneling current was seen as a result of applied microwave fields across the junctions, distinguishable from shot noise and resistance effects. The form of tunneling behavior does not lead to any conductance quantization effects which could manifest the junction as a Quantum Point Contact (QPC), hence it is surmised that the phenomenon is purely low intensity RF field-induced tunneling of electrons across the mesoscale junctions at low temperatures.
Low-Noise Amplification, Detection and Spectroscopy of Ultra-Cold Systems in RF Cavities  [PDF]
Masroor H. S. Bukhari, Zahoor H. Shah
Modern Instrumentation (MI) , 2016, DOI: 10.4236/mi.2016.52002
Abstract: The design and development of a cryogenic Ultra-Low-Noise Signal Amplification (ULNA) and detection system for spectroscopy of ultra-cold systems are reported here for the operation in the 0.5 - 4 GHz spectrum of frequencies (the “L” and “S” microwave bands). The design is suitable for weak RF signal detection and spectroscopy from ultra-cold systems confined in cryogenic RF cavities, as entailed in a number of physics, physical chemistry and analytical chemistry applications, such as NMR/NQR/EPR and microwave spectroscopy, Paul traps, Bose-Einstein Condensates (BEC’s) and cavity Quantum Electrodynamics (cQED). Using a generic Low-Noise Amplifier (LNA) architecture for a GaAs enhancement mode High-Electron Mobility FET device, our design has especially been devised for scientific applications where ultra-low-noise amplification systems are sought to amplify and detect weak RF signals under various conditions and environments, including cryogenic temperatures, with the least possible noise susceptibility. The amplifier offers a 16 dB gain and a 0.8 dB noise figure at 2.5 GHz, while operating at room temperature, which can improve significantly at low temperatures. Both dc and RF outputs are provided by the amplifier to integrate it in a closed-loop or continuous-wave spectroscopy system or connect it to a variety of instruments, a factor which is lacking in commercial LNA devices. Following the amplification stage, the RF signal detection is carried out with the help of a post-amplifier and detection system based upon a set of Zero-Bias Schottky Barrier Diodes (ZBD’s) and a high-precision ultra-low noise jFET operational amplifier. The scheme offers unique benefits of sensitive detection and very-low noise amplification for measuring extremely weak on-resonance signals with substantial low- noise response and excellent stability while eliminating complicated and expensive heterodyne schemes. The LNA stage is fully capable to be a part of low-temperature experiments while being operated in cryogenic conditions down to about 500 mK.
Usefulness of hook wire localization biopsy under imaging guidance for nonpalpable breast lesions detected radiologically
Masroor I, Afzal S, Shafqat G, Rehman H
International Journal of Women's Health , 2012, DOI: http://dx.doi.org/10.2147/IJWH.S35280
Abstract: efulness of hook wire localization biopsy under imaging guidance for nonpalpable breast lesions detected radiologically Original Research (1243) Total Article Views Authors: Masroor I, Afzal S, Shafqat G, Rehman H Published Date August 2012 Volume 2012:4 Pages 445 - 449 DOI: http://dx.doi.org/10.2147/IJWH.S35280 Received: 22 June 2012 Accepted: 24 July 2012 Published: 31 August 2012 Imrana Masroor,1 Shaista Afzal,1 Gulnaz Shafqat,1 Hasan Rehman2 1Department of Radiology, 2Medical College, Aga Khan University Hospital, Karachi, Pakistan Background: The purpose of this study was to evaluate the usefulness of hook wire localization biopsy under imaging guidance for nonpalpable breast lesions detected radiologically. Methods: This was a descriptive study conducted at the Department of Radiology, Aga Khan University Hospital, Karachi. All patients undergoing needle localization biopsy of a nonpalpable breast lesion under mammographic or ultrasound guidance between January 2009 to December 2010 were included in the study. Patients with incomplete medical records were excluded. All patients’ mammograms or ultrasound were categorized using BI-RADS assessment categories. The percentages of benign and malignant lesions were determined by pathological examination of surgically removed specimens. A correlation was sought between preoperative imaging assessment and the final diagnosis. The complications associated with the procedure were also recorded. Results: A total of 151 biopsies were carried out, of which 80 were performed under mammographic guidance and 71 were performed under ultrasound guidance. The mean age of the patients was 51.89 years. The overall malignancy rate was 25.16%. Of 93 cases reported radiologically as malignant, 60 turned out to be malignant, and of the 58 cases reported as benign on imaging, three proved to be malignant on histopathology. The sensitivity of imaging findings was 95% and the specificity was 62%. The malignancy rate was 5% for benign lesions and 64% for malignant lesions, respectively. There were no complications related to wire localization, and only two patients had minor complications following surgical excision, giving a complication rate of 1.32%. Conclusion: Hook wire localization biopsy is a safe and effective procedure for definitive diagnosis of suspicious lesions on imaging, and is more helpful if the imaging findings are suspicious.
Usefulness of hook wire localization biopsy under imaging guidance for nonpalpable breast lesions detected radiologically
Masroor I,Afzal S,Shafqat G,Rehman H
International Journal of Women's Health , 2012,
Abstract: Imrana Masroor,1 Shaista Afzal,1 Gulnaz Shafqat,1 Hasan Rehman21Department of Radiology, 2Medical College, Aga Khan University Hospital, Karachi, PakistanBackground: The purpose of this study was to evaluate the usefulness of hook wire localization biopsy under imaging guidance for nonpalpable breast lesions detected radiologically.Methods: This was a descriptive study conducted at the Department of Radiology, Aga Khan University Hospital, Karachi. All patients undergoing needle localization biopsy of a nonpalpable breast lesion under mammographic or ultrasound guidance between January 2009 to December 2010 were included in the study. Patients with incomplete medical records were excluded. All patients’ mammograms or ultrasound were categorized using BI-RADS assessment categories. The percentages of benign and malignant lesions were determined by pathological examination of surgically removed specimens. A correlation was sought between preoperative imaging assessment and the final diagnosis. The complications associated with the procedure were also recorded.Results: A total of 151 biopsies were carried out, of which 80 were performed under mammographic guidance and 71 were performed under ultrasound guidance. The mean age of the patients was 51.89 years. The overall malignancy rate was 25.16%. Of 93 cases reported radiologically as malignant, 60 turned out to be malignant, and of the 58 cases reported as benign on imaging, three proved to be malignant on histopathology. The sensitivity of imaging findings was 95% and the specificity was 62%. The malignancy rate was 5% for benign lesions and 64% for malignant lesions, respectively. There were no complications related to wire localization, and only two patients had minor complications following surgical excision, giving a complication rate of 1.32%.Conclusion: Hook wire localization biopsy is a safe and effective procedure for definitive diagnosis of suspicious lesions on imaging, and is more helpful if the imaging findings are suspicious.Keywords: breast cancer, hook wire localization, mammography
Knowledge based Replica Management in Data Grid Computation
Riaz-ul Amin,A. H. S. Bukhari
International Journal of Emerging Sciences , 2011,
Abstract: As the number of scientific disciplines has increased, the large data collections are emerging as important community resources. In domains as high energy physics, and computational genomic, the volume of interesting data is already measured in terabytes and will soon total peta bytes. The Research communities need to access and analyze this data using complex computational and access techniques. No data management infrastructure provides solution against the complex computational analysis of huge and geographically distributed data sets. Most of queries usually search analyzed data from terabytes of distributed data repository, over wide area networks. Replicas, and other advanced techniques collectively maximize the use of scarce storage, networking, and computing resources. Existing data grid replication technique no doubt provide us with availability of required data sets, but in order to create replica it has to bear an overhead of huge computation for required data sets. Large network traffic cause the performance unsatisfactory. Our goal in this effort is to provide users with replication infrastructure in Grid that uses Knowledgebase having learning capability so as to reduce the computation for creating dataset on each user request.
Performance of Cement Containing Laterite as Supplementary Cementing Material
Abbas Bukhari, Z. S.,Chaudhry, A. H.,Iqbal, M. N.,Siddiqui, R. H.
Kemija u Industriji , 2013,
Abstract: The utilization of different industrial waste, by-products or other materials such as ground granulated blast furnace slag, silica fume, fly ash, limestone, and kiln dust, etc. as supplemen- tary cementing materials has received considerable attention in recent years. A study has been conducted to look into the performance of laterite as Supplementary Cementing Materials (SCM). The study focuses on compressive strength performance of blended cement containing different percentage of laterite. The cement is replaced accordingly with percentage of 2 %, 5 %, 7 % and 10 % by weight. In addition, the effect of use of three chemically different laterites have been studied on physical performance of cement as in setting time, Le-Chatlier expansion, loss on ignition, insoluble residue, free lime and specifically compressive strength of cement cubes tested at the age of 3, 7, and 28 days. The results show that the strength of cement blended with laterite as SCM is enhanced. Key words: Portland cement, supplementary cementing materials (SCM), laterite, compressive strength KUI – 6/2013 Received January 4, 2012 Accepted February 11, 2013
Adsorption and Desorption of Heavy Metals onto Natural Clay Material: Influence of Initial pH
S. Lukman,M.H. Essa,Nuhu D. Mu`azu,A. Bukhari
Journal of Environmental Science and Technology , 2013,
Abstract: The adsorptive capacity of natural clay materials towards adsorption of heavy metals as well as the heavy metals competitive adsorptive/desorptive selectivity sequences are greatly influenced by operating conditions. In this study, competitive adsorption of heavy metal ions (Cd, Cr, Cu, Pb and Zn) on natural clay was investigated in order to understand the influence of initial pH on the clay mineral adsorptive capacity and the heavy metals adsorption/desorption selectivity sequences. Batch adsorption and desorption experiments were performed at six different initial pH values (2, 4, 6, 8, 10 and 12). The amount of heavy metals removed at equilibrium in single and multi-component adsorption scenarios were analyzed and interpreted using distribution coefficients followed by selectivity sequence. The results indicated that the selectivity sequence of clay changed with pH for both Single Component (SC) and Multi-Component (MC) scenarios. The selectivity sequence of heavy metal ions on the adsorbent for the single component and multi-component scenarios were Cr>Pb>Cu>Cd>Zn and Cr>Cu>Pb>Cd>Zn, respectively while for multi-component desorption, the selectivity sequence was Cr Keywords clay adsorptive capacity --- Competitive adsorption and desorption --- heavy metals selectivity sequence --- multi-component adsorption --- pH effect
The Effects of Rotation and Salt Concentration On Thermal Convection In a Linear Magneto-Fluid Layer Overlying a Porous Layer  [PDF]
Maram S. Al-Qurashi, Abdul-Fattah K. Bukhari
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.49052
Abstract: A linear stability analysis is applied to a system consisting of a linear magneto-fluid layer overlying a porous layer affected by rotation and salt concentration on both layers. The flow in the fluid layer is governed by Navier-Stokes’s equations and while governed by Darcy-Brinkman’s law in the porous medium. Numerical solutions are obtained using Legendre polynomials. These solutions are studied through two modes of instability: stationary instability and overstability when the heat and the salt concentration are effected from above and below.
A Retrospective Review: Vaginal versus Abdominal Hysterectomy for Benign Gynecological Diseases in a Tertiary Canter  [PDF]
Lujain Bukhari, Ayman A. Bukhari, Omar F. Albakri, Arwa F. Alshamrani, Walaa E. Alahmadi, Hassan S. O. Abduljabbar
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.612094
Abstract: The aims are to review respectively 229 cases of hysterectomy and to find the factor affecting the decision of vaginal hysterectomy. Data collected from medical charts include age, nationality, parity, menopause, history of Dilation and curettage. The following data were obtained: the clinical presentation and the indication for hysterectomy. Postoperative complication includes the estimated blood loss, the number of days in hospital and ICU admission recorded. The route of hysterectomy found that 187 (82%) were abdominal and only 42 (18%) were vaginal. Factors significantly associated with the choice of vaginal approach: age, parity, smaller uterine size and prolapse. Factors affecting the decision of vaginal hysterectomy for treatment of benign diseases are identified as follows: if the age is more than 35 years or if the women already reach menopause, the presenting symptoms are not vaginal bleeding but prolapsed uterus and uterine size is less than 12 weeks.
Musculoskeletal deformities and fractures in Parkinson’s disease
Masroor S, Rana MA, Alenazi B
Journal of Parkinsonism & Restless Legs Syndrome , 2011, DOI: http://dx.doi.org/10.2147/JPRLS.S37044
Abstract: Musculoskeletal deformities and fractures in Parkinson’s disease Letter (526) Total Article Views Authors: Masroor S, Rana MA, Alenazi B Published Date December 2011 Volume 2011:1 Pages 12 - 12 DOI: http://dx.doi.org/10.2147/JPRLS.S37044 Sufian Masroor,1 M. A. Rana,2 Bashir Alenazi3 1McMaster University, Hamilton, Ontario, Canada; 2Parkinson’s Clinic of Eastern Toronto, Toronto, Ontario, Canada; 3Armed Forces Hospital, Riyadh, Saudi Arabia Parkinson’s disease (PD) is a neurodegenerative condition that is characterized by a variety of severely debilitating motor and non-motor symptoms. Further, an increased risk of skeletal deformities and fractures, conditions ranging from scoliosis to osteoporosis, is of noteworthy importance. Following are some of the skeletal deformities seen in PD. Scoliosis, a lateral curving of the spine, is more common in PD patients than in the general population. Although the exact relationship between scoliosis and PD is not clearly known, it has been suggested that scoliosis is closely related to the dopamine deficiency associated with PD. Several studies have noted that the direction of the spinal curvature is correlated with the laterality of the major signs and symptoms of PD.1 It has been suggested that patients may slowly develop a tendency to lean towards the affected lagging side of PD during walking. This may result in the curvature of the spine seen in scoliosis, although genetic, biomechanical, or hormonal factors may play a role as well. Post to: Cannotea Citeulike Del.icio.us Facebook LinkedIn Twitter Readers of this article also read: Stem cell horizons in intervertebral disc degeneration A study on stress and depression experienced by women IT professionals in Chennai, India Tachykinins and neurokinin receptors in bone marrow functions: neural-hematopoietic link Reducing infections through nanotechnology and nanoparticles The management of cornea blindness from severe corneal scarring, with the Athens Protocol (transepithelial topography-guided PRK therapeutic remodeling, combined with same-day, collagen cross-linking) Dementia in Parkinson’s disease – a comprehensive review Postural Hypotension in Parkinson’s disease Depression in Parkinson’s disease Restless legs syndrome Corrigendum
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