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Search Results: 1 - 10 of 997 matches for " Kamran Rostami "
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The Types of Tunnels Maintenance in Umbrella Arch Method  [PDF]
Arash Rostami, Parham Kamali Dehkordi, Morteza Askari Ziarati, Saman Jahani, Kamran Lotfi
Open Journal of Civil Engineering (OJCE) , 2016, DOI: 10.4236/ojce.2016.62014
Abstract: During tunneling in loose grounds, the ground deformation caused by drillings around the tunnel, leads to land subsidence and the adjacent tunnel which would affect tunnel structure and surrounding structures. In such situations it is necessary to improve the properties of the ground prior to drilling operations. In order to acquire tunnel face stability during excavation operations in areas with loose soil fault or areas with lack of adhesion, there are various methods such as split cross drilling, frame holder or auxiliary pre-holding methods such as umbrella arch method; pre-holding methods must provide safety when drilling and must be affordable, economically. In this study, we assessed the previous studies on methods and behaviors of umbrella arch strategy in reinforcing the concrete tunnels, reached the purpose with experimental and numerical methods and offered the latest design achievements, implementation progresses and analysis in relation with this method.
Modeling of the aorta artery aneurysms and renal artery stenosis using cardiovascular electronic system
Kamran Hassani, Mahdi Navidbakhsh, Mostafa Rostami
BioMedical Engineering OnLine , 2007, DOI: 10.1186/1475-925x-6-22
Abstract: The geometrical models of the aortic aneurysms and renal artery stenosis, with different rates, were constructed based on the original anatomical data. The pressure drop of each section due to the aneurysms or stenosis was computed by means of computational fluid dynamics method. The compliance of each section with the aneurysms or stenosis is also calculated using the mathematical method. An electrical system representing the cardiovascular circulation was used to study the effects of these pressure drops and the compliance variations on this system.The results showed the decreasing of pressure along the aorta and renal arteries lengths, due to the aneurysms and stenosis, at the peak systole. The mathematical method demonstrated that compliances of the aorta sections and renal increased with the expansion rate of the aneurysms and stenosis. The results of the modelling, such as electrical pressure graphs, exhibited the features of the pathologies such as hypertension and were compared with the relevant experimental data.We conclude from the study that the aortic aneurysms as well as renal artery stenosis may be the most important determinant of the arteries rupture and failure. Furthermore, these pathologies play important rules in increase of the cardiovascular pulse pressure which leads to the hypertension.The aortic aneurysm is a disease, which is defined as focal or diffuse dilatation of the aorta. Most of the aorta aneurysms are fusiform (concentric radial dilatation) but infrequently may be saccular (eccentric radial dilatation). The abdominal aorta aneurysm is the most common form of the aneurismal disease. Less commonly patients may present with the thoracic aorta aneurysms. The aorta aneurysms have primarily been studied by Long [1] and Morris [2] who investigated the compliance of aortic aneurysms and observed the effects of the pathology. More recent studies have used the clinical data to investigate the aortic aneurysms [3-5].On the other hand, the card
Evaluation of Effect of As2O3 on Cell Growth, Cell Cycle and Apoptosis in Human Leukemia Cell Line HL-60
Shahrbano Rostami,Saeid Abroun,Kamran Alimoghaddam,Mehrdad Nourozinia
International Journal of Hematology-Oncology and Stem Cell Research , 2012,
Abstract: Introduction: Arsenic Trioxide (As2O3) causes antitumor effects by various mechanisms, including degradation of PML-RARA in the acute promyelocytic cells, growth inhibition and induction of apoptosis. However, the precise mechanisms of these processes remain incompletely understood. The purpose of this study was to evaluate the effects of arsenic trioxide on cell growth, cell cycle regulation and apoptosis in PML/RARA negative acute promyelocytic leukemia cell line HL-60.Methods: The cytotoxic effect of As2O3 was assessed by MTT assay, Apoptosis was detected by flow cytometry analysis using annexin V–FITC/PI and cell cycle distribution was evaluated by propidium iodide staining.Results: MTT assay showed that cell growth was inhibited in a time- and dose-dependent manner. As2O3 exerts growth inhibitory effect by arresting the cells at G2/M phase. Apoptosis analysis revealed that As2O3 treatment induced apoptosis at the lower concentrations, while necrosis occurred at the higher concentrations.Conclusion: As2O3 inhibits growth and induces apoptosis of HL-60 cells through induction of cell cycle arrest. Further studies are required to elucidate the molecular mechanisms of As2O3-induced anti-tumor effects.
Coeliac in Patients with Gastrointestinal Symptoms: A Population-Based Study in Tehran
Mohammad Rostami-Nejad,Zahra Nochi,Mohammad Amin Pourhoseingholi,Kamran Rostami
Zahedan Journal of Research in Medical Sciences , 2013,
Abstract: Background: Determination of prevalence of celiac disease among patients with gastrointestinal symptoms was the main objective of this study. Other factors which cause digestive disorders in such patients were also studied. Materials and Methods: This cross sectional-descriptive study was conducted in Tehran province in 2006-2007; to conduct the study 5176 people were selected randomly. Out of them 670 patients with gastrointestinal symptoms were tested to determine the amount of IgA and tissue Transeglutaminase (tTg). The amount of IgA tTG was measured in individuals with IgA deficiency. Results: Out of 670 patients, 427 (63.37%) and 243 (36.37%) patients were women and men, respectively; their average age was 42.5. Anti-tTG test was diagnosed positive in 22 patients (17 women and 5 men) (3.3%). Eight patients showed IgA deficiency. The result of IgG tTG test was found positive in three patients out of the abovementioned 8 patients. Conclusion: This study shows a high dispersion of celiac among Iranian patients with the gastrointestinal symptoms (3%). Routine serologic tests are recommended for diagnosing the unknown cases of sensitivity to gluten.
Treatment of new cases of Acute Promyelocytic Leukemia With Arsenic Trioxide
Ardeshir Ghavamzadeh1,Kamran Alimoghaddam Hamidolah Ghafari Shahrbano Rostami Yousef Mortazavi Mohamad Jahani Roholah Hoss
International Journal of Hematology-Oncology and Stem Cell Research , 2005,
Abstract: Introduction: Arsenic Trioxide is effective and approved for treatment of relapsed or refractory APL cases to ATRA but its effects in new cases of APL is not clear and needs long term follow up to dis close the role of this drug in treatment of APL in combination with chemotherapy/ATRA or alone. Material and methods: we studied 111cases of APL (94 new case and 17 relapsed) diagnosed by mor phological criteria and confirmed by cytogenetic and/or RT-PCR for the presence of PML/RARA fu sion gene."nArsenic Trioxide was infused as 0.15mg/kg/day doses, until complete remission by morphological cri teria or till 60 days. In case of complete remission, after 28 days do rest, 0.15mg/kg/days Arsenic Tri-oxide was infused for an additional 28 days as consolidation. Also, we studied minimal residual disease by semi-sensitive RT- PCR on peripheral blood samples up to a year after complete remission. Results: Complete remission was observed in 95 patients (85.6%) and median time to complete remis sion was 30 days. There was no significant difference between remission rate in new and relapsed cases."nDuring the induction phase, the most common cause of toxicity and mortality was APL differentiation syndrome (23 cases or 20.7%). Other toxicities were serosistis (7.2%) and hepatotoxicity (19.8%). With a median follow up of 16.5(1-57) months for patients in complete remission, one and two year disease free survival (DFS) was 88.3% and 63.7%, respectively. We observed 24 relapses and 19 of them achieved second complete remission, again by Arsenic Trioxide. Median time to relapse was 17 months (4-33) and median time of second DFS after re-treatment with Arsenic Trioxide was 18 months. We observed a third and fourth remission for some patients, who relapsed, again by Arsenic Trioxide."nFor patients in complete remission, one and three years survival was 95.5% and 87.6%, respectively. Minimal residual disease was positive in 4 (8.3%) out of 48 cases up to a year after remission induction and 3 of these patients clinically relapsed."nConclusion: Arsenic Trioxide is effective as a first line treatment of APL. Results of Arsenic Trioxide combination with chemotherapy/ATRA needs further study. Also it seems that Arsenic Trioxide is ap plicable for relapsed patients again and drug resistance is an unusual event
Design of 1.33 μm and 1.55 μm Wavelengths Quantum Cascade Photodetector  [PDF]
S. Khosravi, A. Rostami
Optics and Photonics Journal (OPJ) , 2017, DOI: 10.4236/opj.2017.78B016
Abstract:
In this paper, a quantum cascade photodetector based on intersubband transitions in quantum wells with ability of detecting 1.33 μm and 1.55 μm wavelengths in two individual current paths is introduced. Multi quantum wells structures based on III-Nitride materials due to their large band gaps are used. In order to calculate the photodetector parameters, wave functions and energy levels are obtained by solving 1-D Schrodinger–Poisson equation self consistently at 80 ?K. Responsivity values are about 22 mA/W and 18.75 mA/W for detecting of 1.33 μm and 1.55 μm wavelengths, respectively. Detectivity values are calculated as 1.17 × 107 (Jones) and 2.41 × 107 (Jones) at wavelengths of 1.33 μm and 1.55 μm wavelengths, respectively.
Regional Flood Frequency Analysis Based on L-Moment Approach (Case Study West Azarbayjan Basins)
Ramin Rostami
Journal of Civil Engineering and Urbanism , 2013,
Abstract: Flood estimation with certain frequency is one of the fundamental factors for design ofHydraulic structures, Flood plain, River coastal stabling, Basin management, etc. Accurate estimation offlood frequency discharge increases safety of the structures. L-moment approach was used for floodfrequency analysis in west Azarbayjan province basins. For identifying homogeneous regions, the Wardhierarchical cluster method was used. Site data were used for independent testing of the cluster of the stationfor homogeneity. The west Azarbayjan province divided to four regions. In these regions parameters of theregional frequency distribution were evaluated by L-moment ratios. The L-moment diagram, goodness of fittest, and plotting position methods were used for the selection of appropriate distributions. In westAzarbayjan, Generalized Pareto distribution for region A, Generalized extreme value, Pearson type III andLognormal distributions for region B, Pearson type III, Lognormal, Generalized extreme value distributionsfor region C and Lognormal and Generalized extreme value distribution were appropriate for region D. Therelative Root Mean Square Error (rRMSE) between observed and estimated data in all stations is small.Regional model evaluated for determination of flood discharge magnitude in different frequency by linerand multiple regression method.
Conjugacy classes of non-translations in affine Weyl groups and applications to Hecke algebras
Sean Rostami
Mathematics , 2013,
Abstract: Let W be an Iwahori-Weyl group of a connected reductive group G over a non-archimedean local field. I prove that if w is an element of W that does not act on the corresponding apartment of G by a translation then one can apply to w a sequence of conjugations by simple reflections, each of which is length-preserving, resulting in an element w' for which there exists a simple reflection s such that l(sw's)>l(w'). Even for affine Weyl groups, a special case of Iwahori-Weyl groups and also an important subclass of Coxeter groups, this is a new fact about conjugacy classes. Further, there are implications for Iwahori-Hecke algebras H of G: one can use this fact to give dimension bounds on the "length-filtration" of the center Z(H), which can in turn be used to prove that suitable linearly-independent subsets of Z(H) are a basis.
The Bernstein presentation for general connected reductive groups
Sean Rostami
Mathematics , 2013, DOI: 10.1112/jlms/jdu080
Abstract: Let F be a non-Archimedean local field and let G be a connected reductive affine algebraic F-group. Let I be an Iwahori subgroup of G(F) and denote by H(G; I) the Iwahori-Hecke algebra, i.e. the convolution algebra of complex-valued functions on G(F) which are left- and right-invariant by I-translations. This article proves that the Iwahori-Hecke algebra H(G; I) has both an Iwahori-Matsumoto Presentation and a Bernstein Presentation analogous to those for affine Hecke algebras on root data found in Lusztig's "Affine Hecke algebras and their graded version", and gives a basis (in other words, an explicit Bernstein Isomorphism) for the center Z[H(G; I)] also analogous to that found in loc. cit.
Explicit inducing data for Gross-Reeder-Yu supercuspidals of split reductive groups
Sean Rostami
Mathematics , 2015,
Abstract: Let K be a non-archimedean local field and G a split connected reductive affine algebraic K-group. The simple supercuspidals of the 2010 Duke paper of Gross-Reeder, whose definition was extended by the 2014 JAMS paper of Reeder-Yu beyond split simply connected groups, are very special representations r(x,L) of G(K) attached to the barycenter x of an alcove A and a certain linear functional L. It is known from Reeder-Yu that each irreducible subrepresentation r of r(x,L) is compactly induced from the subgroup H(x,L) of g in G(K) which fix x and L. To fully understand r, it is necessary to understand H(x,L) explicitly. In this paper, I give a factorization of H(x,L) into a product of three natural and explicit subgroups. If G is semisimple and simply connected, then H(x,L) is already known from Gross-Reeder, but in all other cases there are additional elements, coming from the stabilizer in G(K) of A, whose precise form is very delicate and highly dependent on L.
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