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Search Results: 1 - 10 of 138754 matches for " K Nosrati "
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Sediment Sources Fingerprinting: Relation between Enzyme Activities in Soil and Sediment
K. Nosrati,H. Ahmadi,F. Sharifi
Journal of Science and Technology of Agriculture and Natural Resources , 2012,
Abstract: Sediment sources fingerprinting is needed as an autonomous tool for erosion prediction, validation of soil erosion models, monitoring of sediment budget and consequently for selecting soil conservation practices and sediment control methods at the catchment scale. Apportioning of eroded-soil into multiple sources using natural tracers is an integrated approach in soil erosion and sediment studies. The objectives of this study, as a first work, are to assess spatial variations of biochemical tracers and theirs validation in discriminating sediment sources under different land uses and water erosions at catchment scale and to apply them as fingerprints to determine relative contributions of sediment sources in Zidasht catchment, Iran. In view of this, 4 enzyme activities as biochemical tracers were measured in 42 different sampling sites from four sediment sources and 14 sediment samples. The results of discriminant function analysis (DFA) provided an optimum composite of two tracers, i.e. urease and dehydrogenase that afforded more than 92% correct assignations in discriminating between the sediment sources in the study area. Sediment source fingerprinting model was used based on optimum composite of two tracers resulting from DFA to explore the contributions of sediment from the four sources. The results showed that the relative contributions from rangeland/surface erosion, crop field/surface erosion, stream bank and dry-land farming/surface erosion sources were 11.3±5.3, 8.1±3.8, 75±8.5 and 3.6±2.5, respectively. Therefore, we can conclude that fingerprinting using biochemical tracers may help develop sediment fingerprinting models and as a first step facilitate a more complete tool for fingerprinting approach in the future.
Wavelet Galerkin method for solving singular integral equations
K Maleknejad,M Nosrati,E Najafi
Computational and Applied Mathematics , 2012, DOI: 10.1590/s1807-03022012000200009
Abstract: An effective technique upon linear B-spline wavelets has been developed for solving weakly singular Fredholm integral equations. Properties of these wavelets and some operational matrices are first presented. These properties are then used to reduce the computation of integral equations to some algebraic equations. The method is computationally attractive, and applications are demonstrated through illustrative examples. Mathematical subject classification: 45A05, 32A55, 34A25, 65T60.
Ameloblastomatous calcifying odontogenic cyst; a case report
M Seyed-majidi,K Nosrati,S Haghanifar
Journal of Isfahan Dental School , 2009,
Abstract: Introduction: Calcifying odontogenic cyst (COC) is an uncommon developmental odontogenic cyst first described by Gorlin in 1962. It is considered as extremely rare and accounts for only 1% of jaw cysts reported. Because of its diverse histopathology, there has always been confusion about its nature as a cyst, neoplasm or hamartoma.Case Report: In this report, we present a rare case of calcifying odontogenic cyst with ameloblastic proliferation, an extremely rare histologic variant, in a 15 year old female in the left mandibular molar region. The lesion was surgically removed. After enucleation and curettage, no recurrence recorded in next two years.Conclusion: Ameloblastomatous calcifying odontogenic cyst, microscopically resembles unicystic ameloblastoma except for the ghost cells and dystrophic calcifications within the proliferative epithelium. There has always been confusion about its nature as a cyst, neoplasm or hamartoma. Microscopically, this cyst shows ameloblastic proliferation in the connective tissue but no characteristics of basal cell hyperchromatism, vacuolization and nuclear polarization which is often seen in ameloblastoma, are present here. Ameloblastoma ex COC and ameloblastomatous COC are morphologically and clinically entirely different and easily distinguishable.Key words: Calcifying odontogenic cyst, Ghost cell, Gorlin Cyst, Ameloblastic proliferation
Efficacy of Nd:YAG Laser for the Treatment of Hidradenitis Suppurativa  [PDF]
Neda Nosrati, Lindsey Hunter, Erica Kelly
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2012, DOI: 10.4236/jcdsa.2012.22019
Abstract: Hidradenitis suppurativa (HS) is an inflammatory skin disease that involves sebaceous glands and hair follicles of intertriginous areas, including axillary and inguinal regions. It is often chronic, painful, disabling, and can worsen over time. Besides surgically excising affected areas, effective treatments are currently lacking. The long-pulsed neodymium:yttrium-aluminium-garnet (Nd:YAG) laser is a device that has traditionally been used for hair removal, but has recently shown promise in clearing old lesions of HS and preventing new eruptions. In accordance with studies in the current literature, we hypothesize that the Nd:YAG laser will significantly improve subjects with hidradenitis suppurativa compared to standard, uninvasive treatment with topical antibiotics [1,2]. Study aims include: to treat subjects with hidradenitis suppurativa with Nd:YAG laser therapy once monthly for 3 consecutive months, with a one month follow-up; to compare the effectiveness of Nd:YAG treatment on one side of the subject (e.g., right) to treatment with topical antibiotics on the subject’s other side (e.g., left); to assess treatment response using a visual analogue scale; to assess subject satisfaction with treatment using a questionnaire; and to photodocument treatment response at each visit.
Loaded Coupled Transmission Line Approach of Left-Handed (Lh) Structures and Realization of a Highly Compact Dual-Band Branch-Line Coupler
Mohsen Hayati;Mehdi Nosrati
PIER C , 2009, DOI: 10.2528/PIERC09041508
Abstract: A novel approach of left-handed (LH) structures is introduced to reduce the size of microwave components by combining a loaded coupled transmission lines and complementary split ring resonators (CSRRs). The performance of the loaded part of the proposed model is equal by two cascaded unit elements. The equivalent circuit model and subsequently, the left and right handed transmission frequencies of the proposed structure are presented. A highly miniaturized dual-band branch-line coupler (BLC) is analyzed, designed, tested and proposed by this technique. The size reduction is reported about 75% in analogy with the conventional ones. The measurement results are in good agreement with the theoretical ones.
Bandwidth Enhancement and Further Size Reduction of a Class of Elliptic-Function Low-Pass Filter Using Modified Hairpin Resonators
Mehdi Nosrati;Ayat Najafi
PIER C , 2008,
Abstract: A compact elliptic-function low pass filter using microstrip stepped-impedance modified-hairpin resonators is developed and a multiple cascaded filter using semi-hairpin resonators is designed, analyzed and tested. Sharpness of cut off frequency, low insertion-loss, enhancement of bandwidth and very compact size are features of the proposed low-pass filter. Size reduction of this filter is reported about 62% with 13% enhancement of bandwidth respects to the conventional filter with comparable performance. The measurement results are in good agreement with the theoretical ones.
Periapical Odontogenic Keratocyst
Maryam Seyedmajidi,Kamran Nosrati
Jundishapur Scientific Medical Journal , 2012,
Abstract: Background and Objective: Odontogenic keratocyst is a developmental odontogenic cyst. It is to be considered for histopathological features and clinical behavior. It has aggressive behavior and tendency to recurrence and it has been named benign cystic neoplasm. OKCs have different radiographic appearance such as unilocular to multilocular radiolucency. In some cases, they have been observed in the interradicular area but in rare cases they can be found in periapical radiolucency in apex of non-vital teeth that may be mistaken with lesions of endodontic origin and cause mistreatment.Case Report: A 33 year old male patient came to clinic because of swelling in the anterior region of mandible that was repaired with endodontic treatment. In the histological diagnosis of radiolucent lesion, inflamed odontogenic keratocyst was reported. Conclusion: Diagnosis based on clinical finding may risky because it can lead to inappropriate treatment. In most of the cases, microscopic examination of all material surgically removed is necessary for diagnosis. This is especially recommended when treatment of lesion is not successful with routine treatment.
Gorlin cyst and clinicopathological aspects
Safoora Seifi,Kamran Nosrati
Iranian Journal of Otorhinolaryngology , 2010,
Realization of a Compact Branch-Line Coupler Using Quasi-Fractal Loaded Coupled Transmission-Lines
Mehdi Nosrati;Bal Singh Virdee
PIER C , 2010, DOI: 10.2528/PIERC10031303
Abstract: An extremely compact branch-line coupler operating at 900 MHz is presented without the use of viaholes, multilayered technique, or air-bridged. The technique presented here uses the concept of fractals to load a coupled transmission-line in order to realize a compact quarter-wavelength transmission-line, which forms the couplers arms. It is shown that the proposed branch-line coupler's performance is analogous to a conventional branch-line coupler with the benefit of substantially reduced physical dimensions by a factor of 78%. The measured result of the fabricated microstrip branch-line coupler is compared with the simulation data. The agreement of the measurement and simulated confirms the theory and validates the proposed coupler design.
A New Method to Measure the Similarity between Features in Machine Learning Using the Triangular Fuzzy Number
Hassan Nosrati Nahook,Mahdi Eftekhari
International Journal of Soft Computing & Engineering , 2013,
Abstract: In this paper, we present a new method to measure the similarity between features using fuzzy numbers. The proposed method uses the concept of geometry to calculate the degree of similarity between triangular fuzzy numbers defined on the features. We also prove some properties of the proposed similarity measure and use different data sets to compare the proposed method with existing methods. In the feature selection methods, the proposed similarity measure compared with other fuzzy similarity measures can be more efficient.
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