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Search Results: 1 - 10 of 401756 matches for " M. Naser-Moghaddasi "
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Reconstruction of Shape and Position for Scattering Objects by Linear Sampling Method
A.R. Eskandari,M. Naser-Moghaddasi,M. Eskandari
International Journal of Soft Computing & Engineering , 2012,
Abstract: This paper presents an approach for shape and position reconstruction of a scattering object using microwaves where the scatterer is assumed to be a homogenous dielectric medium. The employed technique assumes no prior knowledge of the scatter’s material properties like electric permittivity and conductivity, and the far-field pattern is used as the only primary information in identification. The approach proposed consists of retrieving the shape and the position of the scattering object using a linear sampling method. The technique results in high computational speed and efficiency. In addition, the technique can be generalized for any scatterer structure. Numerical results are used to validate the feasibility of the proposed approach.
A 0.4 V Bulk-Driven Amplifier for Low-Power Data Converter Applications  [PDF]
R. Rezaei, A. Ahmadpour, M. N. Moghaddasi
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.41016
Abstract:

This paper presents the design of an ultra low-voltage (ULV) pseudo operational transconductance amplifier (P-OTA) that is able to operate with a single supply voltage as low as 0.4 V. The proposed circuit is based on the bulk-driven technique and use of cross-coupled self-cascode pairs that boosts the differential DC gain. The stability condition of this structure for the DC gain is considered by definition of two coefficients to cancel out a controllable percentage of the denominator. This expression for stability condition yield optimized value for the DC gain. Also, as the principle of operation of the proposed technique relies on matching conditions, Monte Carlo analyzes are considered to study of the behavior of the proposed circuit against mismatches. The designed P-OTA have a DC gain of 64 dB, 212 KHz unity gain bandwidth, 57\"\"phase margin that is loaded by 10 pF differential capacitive loads, while consume only 16 μW. Eventually, from the proposed P-OTA, a low-power Sample and Hold (S/H) circuit with sampling frequency of 10 KS/s has been designed and simulated. The correct functionality for this configuration is verified from –30 to 70. The simulated data presented is obtained using the HSPICE Environment and is valid for the 90 nm triple-well CMOS process.

Correlation between the Degree and Severity of Symptoms and CT scan Changes in Chronic Rhinosinusitis (CRS)
H. Moghaddasi,M. Sanei Taheri,M. Vazirnezami,A. Jalali
Iranian Journal of Radiology , 2008,
Abstract: Background/Objective: find out whether any correlation exists between the degree and severity of symptoms as assessed by the SNOT-20 questionnaire and CT scan changes as graded by Lund-Mackay scoring system in chronic rhinosinusitis (CRS)."nPatients and Methods: Fifties patients attending the otolaryngology department and diagnosed with CRS were prospectively entered in this study. All patients had their CT scans graded by using the Lund-Mackay with the sino-nasal outcome questionnaire (SNOT-20). Correlation analysis was conducted to determine whether the CT scan stage as assigned by Lund Mackay staging system correlated with the SNOT-20 scores."nResults: The mean age of our patients was 32.4±8.5 and 32(64%) of them were male and 18(36%) were female. The mean SNOT-20 was 45±8.7 (29-67) and the mean Lund-Mackay sinus score was 18.5±5 (8- 24).The mean SNOT-20 score was higher for postnasal drip (PND) and facial pain, and the lowest mean scores were for dizziness and ear pain. The Pearson's correlation coefficient confirmed that there was a good correlation between SNOT-20 scores and CT scores (Pearson correlation coefficient 0.77; P value, 0.0001)."nConclusion: Patients with higher symptom scores are more likely to have CT imaging evidence of rhinosinusitis. In patients with isolated sleep or systematic symptoms, the likelihood of rhinosinusitis is less, even if symptoms are severe. Therefore, in these patients, sinus CT-scan should be considered before treatment to establish the diagnosis of chronic rhinosinusitis due to that a number of these patients may be doing not have rhinosinusitis.
The 19 kDa Protein from Mycobacterium avium subspecies paratuberculosis Is a Glycolipoprotein  [PDF]
Saleh A. Naser, Saisathya Thanigachalam, Natalia Spinelli, Mitra M. Safavi, Najih Naser, Omar Khan
Advances in Microbiology (AiM) , 2013, DOI: 10.4236/aim.2013.37070
Abstract:

This study characterizes the 19 kDa protein expressed by Mycobacterium avium subspecies paratuberculosis (MAP) as a glycolipoprotein, providing the foundation for future experiments regarding its antigenicity and role in disease pathogenicity. We have previously shown that a 4.8 kb insert from MAP will produce a 16 kDa recombinant protein when expressed in Escherichia coli and 19 kDa recombinant protein when expressed in M. smegmatis (smeg19K). The difference of 3 kDa in size of these expressed proteins may be related to post translational modifications that occur in Mycobacterium species. We hypothesized that smeg19K is a glycolipoprotein since BLAST analysis revealed approximately 76% amino acid identity between the MAP 19 kDa protein and a known lipoglycoprotein, the 19 kDa protein of M. tuberculosis. This prediction was confirmed by the following positive staining of smeg19K with Sudan Black 4B, a postelectrophoresis dye used to stain for lipids. Smeg19K has also stained positively for glycosylation with the lectin concavalin A, a highly specific stain for mannose residues. As expected, treatment with tunicamycin (an antibiotic known to inhibit N-glycosylation) and treatment with deglycosylation assay (non-specific for mannose), showed no reduction in size of 19 kDa glycolipoprotein.

Exergy Analysis and Second Law Efficiency of a Regenerative Brayton Cycle with Isothermal Heat Addition
Naser M. Jubeh
Entropy , 2005, DOI: 10.3390/e7030172
Abstract: The effect of two heat additions, rather than one, in a gas turbine engine is analyzed from the second law of thermodynamics point of view. A regenerative Brayton cycle model is used for this study, and compared with other models of Brayton cycle. All fluid friction losses in the compressor and turbine are quantified by an isentropic efficiency term. The effect of pressure ratio, turbine inlet temperature, ambient temperature, altitude, and altitude with variable ambient temperature on irreversibility "exergy destroyed" and second law efficiency was investigated and compared for all models. The results are given graphically with the appropriate discussion and conclusion.
A New Method for Synthesis of Poly(2,6-dimethyl-1,4-phenylene oxide) and Poly(2,6-diphenyl-1,4-phenyl oxide)
Naser M. Al Andis
Journal of Chemistry , 2013, DOI: 10.1155/2013/856928
Abstract:
Carcinoid tumor of the lung: Report of seven cases
Moghaddasi AH
Tehran University Medical Journal , 2000,
Abstract:
National Health Information Network (NHIN) is the main target for medical informatics
Hamid Moghaddasi
Journal of Paramedical Sciences , 2010,
Abstract: As we know, medical informatics comprises two general domains: health information system (HIS); and electronic health record (EHR). Medical informatics deals with production and development of IT-based health information systems as they have interoperability with the other related systems in national or international health information networks; and from conceptual perspectives comprises computer; information; and medical sciences.Indeed, NHIN is the infrastructure of integrated health system as an integrated, interoperable, and distributed set of health information systems in a country with the capability of linkage to the other NHINs in the world. NHIN is a comprehensible knowledge-based network of networks that will securely connect consumers, providers and others who have, or use health related data and services while protecting the confidentiality of health information.By means of NHIN, the Department of Health (DoH) can totally and precisely monitor all nationwide medical issues to detect and prevent any problem that could decrease people’s or community’s health level.
Effects of CW CO2 Laser Annealing on Indium Tin Oxide Thin Films Characteristics  [PDF]
Forat H. Alsultany, Naser M. Ahmed, M. Z. Matjafri
Soft Nanoscience Letters (SNL) , 2014, DOI: 10.4236/snl.2014.44012
Abstract: In this work ITO thin film annealing was carried out using a CW CO2 laser beam for ITO thin film annealing over a 1 cm2 area with a temperature higher than 250°C to obtain ITO grains with excellent structural quality thin films. The obtained ITO films were characterized for crystallization, surface morphology, electrical and optical properties, which has theoretical significance and application value. ITO thin films are deposited on glass substrates by sputter coater system (RF) from a high density target (In2O3-SnO2, 90-10 wt%). After deposition, ITO thin films have been irradiated by CW CO2 laser (λ = 10.6 μm) with power ranging from 1 to 10 watt. These films were annealed at temperatures 250°C, 350°C, and 450°C in the air for 20 minutes using different laser power. The main incentive was to develop a low temperature process for ITO thin films, which typically required a 350°C anneal to crystallize and achieve optimum optical and electrical properties. The XRD results showed that 350°C temperature laser annealing could crystallize ITO with a strong (222) preferred orientation and its grain size increased from 29.27 nm to 48.63 nm. The structure, optical transmission, energy gap, resistivity and sheet resistance of the ITO thin films were systematically investigated as a function of laser post annealing temperature. It was found that the lowest resistivity was 2.9 × 10-4 Ω-cm and that sheet resistance was 14.5 Ω/sq. And the highest optical transmittance (98.65%) of ITO films was obtained at 350°C annealing temperature.
Controlling Diameter, Length and Characterization of ZnO Nanorods by Simple Hydrothermal Method for Solar Cells  [PDF]
Ahmed H. Kurda, Yousif M. Hassan, Naser M. Ahmed
World Journal of Nano Science and Engineering (WJNSE) , 2015, DOI: 10.4236/wjnse.2015.51005
Abstract: Zinc oxide (ZnO) nanorods have been synthesized by solution processing hydrothermal method in low temperature using the spin coating technique. Zinc acetate dehydrate, Zinc nitrate hexahydrate and hexamethylenetetramine were used as a starting material. The ZnO seed layer was first deposited by spin coated of ethanol zinc acetate dehydrate solution on a glass substrate. ZnO nanorods were grown on the ZnO seed layer from zinc nitrate hexahydrate and hexamethylene-tetramine solution, and their diameters, lengths were controlled by precursor concentration and development time. From UV-Visible spectrometry the optical band gap energy of ZnO nanorods was calculated to be 3.3 eV. The results of X-Ray Diffraction (XRD) showed the highly oriented nature of ZnO nanorods the hardest (002) peak reflects that c-axis elongated nanorods are oriented normal to the glass substrate. The Field Emission Scanning Electron Microscope (FESEM) was employed to measure both of average diameter of ZnO nanorods, Energy Dispersive X-Ray (EDX) is used to identify the elemental present and to determine the element composition in the samples.
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