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Search Results: 1 - 10 of 401315 matches for " Alimohammad M. Nazari "
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Minimum Rank of Graphs Powers Family  [PDF]
Alimohammad M. Nazari, Marzieh Karimi Radpoor
Open Journal of Discrete Mathematics (OJDM) , 2012, DOI: 10.4236/ojdm.2012.22012
Abstract: In this paper we study the relationship between minimum rank of graph G and the minimum rank of graph for some families of special graph G, where is the jth power of graph G.
A Modified Precondition in the Gauss-Seidel Method  [PDF]
Alimohammad Nazari, Sajjad Zia Borujeni
Advances in Linear Algebra & Matrix Theory (ALAMT) , 2012, DOI: 10.4236/alamt.2012.23005
Abstract: In recent years, a number of preconditioners have been applied to solve the linear systems with Gauss-Seidel method (see [1-7,10-12,14-16]). In this paper we use Sl instead of (S + Sm) and compare with M. Morimoto’s precondition [3] and H. Niki’s precondition [5] to obtain better convergence rate. A numerical example is given which shows the preference of our method.
The Inverse Eigenvalue Problem for Some Especial Kinds of Matrices
A. M. Nazari,M. Alibakhshi
Lecture Notes in Engineering and Computer Science , 2008,
OFDM-CPM Performance and FOBP under IEEE802.16 Scenario
Alimohammad Montazeri
Signal Processing : An International Journal , 2009,
Abstract: The application of Orthogonal frequency domain modulation-Continuous Phase Modulation (OFDM-CPM) in multipath Stanford University Interim (SUI) channels is presented in this paper. OFDM-CPM is proposed for IEEE 802.16 standards as an alternative technique of orthogonal frequency division multiplexing (OFDM) in physical layer. It is shown that, in addition to 0dB Peak to Average Power Ratio (PAPR) and power efficiency, un-coded OFDM-CPM exploits the frequency diversity of multipath channel. Taking into account the Input Power Back off (IBO), OFDM-CPM is shown to outperform OFDM at high bit energy-to-noise density ratios (Eb/N0). However, at low Signal to Noise Ratio (SNR), the OFDM-CPM phase demodulator receiver suffers from a threshold effect. In addition, this paper compares the spectral fractional out of band power of OFDM-CPM for different modulation indices.
Study of Efficacy of Disinfecting Effects of the Deconex 50 AF And Glutaraldehyd on Bacteria Isolated From Surgical Room Of Hospitals of Hamadan
R Yousefi Mashouf,M Nazari
Iranian Journal of Public Health , 2007,
Abstract: Background: Nosocomial infection is one of the most important and problematic difficult in the educational hospital. There are different points of view about applying of disinfectant material in surgical rooms. According to the both side effect and health care financial, selecting the best material to disinfections is important. Therefore this study has been done to determine of effects of two material including Cidex (glutaraldehyd) and Deconex 50 AF (ammonium quaternary compounds). Methods: In this study 460 samples were collected randomizing from surgical rooms of Mobasher Kashany and Imam Khomeini hospitals of Hamadan. The samples were taken from surfaces and surgical instrument. The first group was the samples that were taken before and after applying Glutaraldehyd. In this group there were 110 samples befor and 110 after doing disinfections. The second group was the samples that were taken before and after applying Deconex 50 AF. The numbers of samples were 120 before and 120 after doing disinfections. There were five days interval between each stage of sampling in this period, the surgical room was active after selecting and the samples were cultured on the specific media and transferred to lab. Then the data were analyzed and compared by SPSS program by computer. Results: The most important bacteria isolated were as follow: Bacillus subtilis, Staphylococcus epidermidis, Enterobacter aeroginosa, Corynebacterium diphteroides and E. coli. This study also indicated that the efficacy of the two solution were significantly different (P= 0.04) before and after disinfections. The disinfections effect of Deconex 50 AF was 73% and Glutaraldehyde was 59%. Acording to the ranking of efficacy, the first is Deconex 50 AF and the second is Glutaraldehyde. Conclusion: Our results showed that Deconex 50 AF was relatively more effective than Glutaradlehyde and also it has less side effect rather than Glutaradlehyde.
The role of tinting and characterization of denture base in removable prostheses
Zarrati S,Nazari Marzjarani M
Journal of Dental Medicine , 2002,
Abstract: Esthetic is a natural necessity among all human beings, and the reconstruction of the natural features of prosthesis is considered an important aspect in dentistry. Reconstruction of the natural features in removable prosthesis by characterization of denture base is one of the most important factors. In this regard esthetic, in removable prostheses, is achieved through different techniques such as: tooth selection and arrangement, designing the denture base and acrylic base color. The final goal for ail these effects is to achieve a natural appearance for denture. However, other factors such as treatment limitations, different personal needs and general health principles, should be taken into consideration. This article not only reviews the natural appearance of oral mucosa that is replaced by the denture base, but also discusses about the materials used in tinting acrylic denture base and their application techniques.
Determination of Trace Amounts of Lead by Modified Graphite Furnace Atomic Absorption Spectrometry after Liquid Phase Microextraction with Pyrimidine-2-thiol  [PDF]
Saeid Nazari
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.27087
Abstract: The liquid phase microextraction (LPME) was combined with the modified Graphite furnace atomic absorption spectrometry (GF-AAS) for determination of lead in the water and solid samples. In a preconcentration step, lead was extracted from a 2 ml of its aqueous sample in the pH = 5 as lead-Pyrimidine-2-thiol cationic complex into a 4 µl drop of 1,2 dichloroethane and ammonium tetraphenylborate as counter ion immersed in the solution. In the drop, the lead-Pyrimidine-2-thiol ammonium tetraphenylborate ion associated complex was formed. After extraction, the microdrop was retracted and directly transferred into a graphite tube modified by [W.Pd.Mg] (c). Some effective parameters on extraction and complex formation, such as type and volume of organic solvent, pH, concentration of chelating agent and counter ion, extraction time, stirring rate and effect of salt were optimized. Under the optimum conditions, the enrichment factor and recovery were 525% and 94%, respectively. The calibration graph was linear in the range of 0.01 - 12 µg?L–1 with correlation coefficient of 0.9975 under the optimum conditions of the recommended procedure. The detection limit based on the 3Sb criterion was 0.0072 µg?L–1 and relative standard deviation (RSD) for ten replicate measurement of 0.1 µg?L–1 and 0.4 µg?L–1 lead was 4.5% and 3.8% respectively. The characteristic concentration was 0.0065 µg?L–1 equivalent to a characteristic mass of 26 fg. The results for determination of lead in reference materials, spiked tap water and seawater demonstrated the accuracy, recovery and applicability of the presented method.
Effects of Occupational Therapy and Neurofeedback on Recovery of the Motor Function in Stroke Patients (A Single-System Design)
M Farshchi,M Akbarfahimi,MA Nazari
Modern Rehabilitation , 2012,
Abstract: Background and aim: Motor impairments, such as hemiparesis, incoordination and spasticity, are the most common deficits after stroke. Most patients show recovery in some of their lost motor function over time. Motor rehabilitation are included mixed of combined movement therapy techniques in many occupational clinics. cerebral waves such as Theta wave can influence on patients function. There fore, the purpose of this study is to understand the influence of combined of occupational therapy and neurofeedback on motor recovery of stroke patients.Materials and methods :This study used a single-system (A-B) design. During the baseline phase patient's function of upper and lowe limb were measured by Fugl-Meyer and Berg Test on three day intervals during 4 week and have occupational therapy every day. After this time, their treatment program began. In this phase they received combined of neurofeedback and occupational therapy for 4 week. Then results of evaluations of two phases were analysed. Results: Both cases show significant recovery at upper limbs( case1 81.1% , case2 68.1%) and lower limbs( case1 73.1% , case2 75.4% ) in Fugel-Mayer test and Berg test( case1 51.6% , case2 68.1%).Conclusion:Regarding the significant recovery of upper and lower limb function of patients, adding neurofeedback to routine occupational therapy can be considered as a practical method in rehabilitation of stroke patients. However further research is needed.
Static Stress-strain Analyses of Embankment Dam with Asphalt Core
R. Ziaie Moayed,M. Nazari,M. Kamalzare
Journal of Applied Sciences , 2011,
Abstract: en investigated. Also, vertical stress distribution at the end of construction and vertical and horizontal displacements after sluicing have been studied. Results show that vertical stress values in asphaltic core reach two times of overburden pressure that indicates considerable load transfer to asphaltic core and maximum vertical displacement of asphaltic core in the end of construction was 0.22 m while horizontal displacement of asphaltic core is negligible. Also, the results reveal that removal of alluvial layer from beneath of down-stream shell will not assist adjustment of stresses and strains in core.
Embryonic development of four species of palaemonid prawns (Crustacea, Decapoda): pre-naupliar, naupliar and post-naupliar periods
Müller, Yara;Ammar, Dib;Nazari, Evelise;
Revista Brasileira de Zoologia , 2004, DOI: 10.1590/S0101-81752004000100005
Abstract: the embryonic development of four species of the family palaemonidae was studied under laboratory conditions. adults of macrobrachium olfersi (wiegman, 1836), macrobrachium potiuna (müller, 1880), palaemon pandaliformis (stimpson, 1871) and palaemonetes argentinus (nobili, 1901) were collected in santa catarina island, santa catarina, brazil and maintained at 26oc. the following embryonic characters were analyzed: egg shape, yolk organization and cleavage plane, naupliar and post-naupliar appendages, stomodeum, optical lobes, eyes, telson, embryo curvature and the space occupied by the embryo in the egg. different rates of development were observed for the four species, with m. potiuna showing the longest time of embryogenesis. the species studied followed the pattern of embryogenesis of centrolecithal eggs, enabling the identification of similar features of the development, and the establishment of eight common embryonic stages.
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