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Search Results: 1 - 10 of 26 matches for " Atousa Pahlevan "
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Web Service Assurance: The Notion and the Issues
Marco Anisetti,Claudio A. Ardagna,Ernesto Damiani,Fulvio Frati,Hausi A. Müller,Atousa Pahlevan
Future Internet , 2012, DOI: 10.3390/fi4010092
Abstract: Web service technology provides basic infrastructure for deploying collaborative business processes. Web Service security standards and protocols aim to provide secure communication and conversation between service providers and consumers. Still, for a client calling a Web service it is difficult to ascertain that a particular service instance satisfies—at execution time—specific non-functional properties. In this paper we introduce the notion of certified Web service assurance, characterizing how service consumers can specify the set of security properties that a service should satisfy. Also, we illustrate a mechanism to re-check non-functional properties when the execution context changes. To this end, we introduce the concept of context-aware certificate, and describe a dynamic, context-aware service discovery environment.
A New Design for Anterior Fixed Partial Denture, Combining Facial Porcelain and Lingual Metal; PTU Type II
A. Pahlevan
Journal of Dentistry of Tehran University of Medical Sciences , 2005,
Abstract: A new design for replacing a missing anterior tooth is described. In this article, a lingually fixed partial denture, its advantages, disadvantages, indication and contraindications have been explained. The ability of this design to replace a single missing central or lateral incisor is discussed.
A New Design for Anterior Porcelain Fused to Metal Fixed Prosthetic Restorations; PTU Type III
A. Pahlevan
Journal of Dentistry of Tehran University of Medical Sciences , 2006,
Abstract: A new design for anterior fixed-partial denture (FPD) and crown is described. This article presents its advantages, disadvantages, indications and contraindications.The new design which has been exercised for 8 years provides esthetics and high strength for the restorations and the results have been satisfactory.
A New Design for Anterior Laminate Fixed-Partial dentures; PTU Type I
A. Pahlevan
Journal of Dentistry of Tehran University of Medical Sciences , 2006,
Abstract: A new fixed-partial denture design using laminates is described for the replacement of a missing anterior tooth. In this article advantages, disadvantages, indications and contraindications of the new design have been discussed. This method is best suited forcases with missing incisors and esthetically compromised abutment teeth.
Evaluation of effects of dentin bonding agents on microleakage in composite restorations
Pahlevan A.,Rahebi SH.
Journal of Dental Medicine , 2002,
Abstract: Dentin bonding agents create stronger bonding between dental composites and dentin. But, none of them can prevent the microleakage. The important factors of progressing microleakage are the stress of polymerization shrinkage of resin composite and removal of smear layer in total-etch technique. The aim of this study was the evaluation of the effect of experimental method (modifying smear layer and etching of enamel margin) and comparison with the total-etch technique. In this experimental method, 60 extracted human molar teeth were disinfected. Then, class 5 cavities were prepared on the buccal surface and 1 mm above CEJ. The specimens were divided randomly to 6 groups with iO samples in each group. The specimens groups were:"n1- Scotchbond Muiti- Purpose Plus Adhesive System (S.B.M.P.P) +Tetric composite"n2- S.B.M.P.P + Ariston composite"n3- Ariston liner + Ariston composite"n4- S.B.M.P.P without enamel and dentin etching + Tetric composite + rebonding with Flowable Tetric"n5- S.B.M.P.P without enamel and dentin etching + Ariston composite + rebonding with Flowable Tetric"n6- S.B.M.P.P without enamel and dentin etching + Tetric composite"nAfter finishing and polishing, the specimens were termocycled, stained with fushin, sectioned within the specimens and evaluated for dye penetration with stereomicroscope. Wilcoxon Sign and Kruskal Wallis tests were used for statistical analysis."nResults showed that group 3 had microleakage more than groups of 1, 2 and 5 (P<0.0 5) and this difference was significant. There was no significant difference among the other groups.
Equilibration in the Aftermath of the Lunar-Forming Giant Impact
Kaveh Pahlevan,David Stevenson
Physics , 2010, DOI: 10.1016/j.epsl.2007.07.055
Abstract: Simulations of the moon-forming impact suggest that most of the lunar material derives from the impactor rather than the Earth. Measurements of lunar samples, however, reveal an oxygen isotope composition that is indistinguishable from terrestrial samples, and clearly distinct from meteorites coming from Mars and Vesta. Here we explore the possibility that the silicate Earth and impactor were compositionally distinct with respect to oxygen isotopes, and that the terrestrial magma ocean and lunar-forming material underwent turbulent mixing and equilibration in the energetic aftermath of the giant impact. This mixing may arise in the molten disk epoch between the impact and lunar accretion, lasting perhaps 10^2-10^3 yr. The implications of this idea for the geochemistry of the Moon, the origin of water on Earth, and constraints on the giant impact are discussed.
Aortic Wave Dynamics and Its Influence on Left Ventricular Workload
Niema M. Pahlevan, Morteza Gharib
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0023106
Abstract: The pumping mechanism of the heart is pulsatile, so the heart generates pulsatile flow that enters into the compliant aorta in the form of pressure and flow waves. We hypothesized that there exists a specific heart rate at which the external left ventricular (LV) power is minimized. To test this hypothesis, we used a computational model to explore the effects of heart rate (HR) and aortic rigidity on left ventricular (LV) power requirement. While both mean and pulsatile parts of the pressure play an important role in LV power requirement elevation, at higher rigidities the effect of pulsatility becomes more dominant. For any given aortic rigidity, there exists an optimum HR that minimizes the LV power requirement at a given cardiac output. The optimum HR shifts to higher values as the aorta becomes more rigid. To conclude, there is an optimum condition for aortic waves that minimizes the LV pulsatile load and consequently the total LV workload.
A Bio-Inspired Approach for the Reduction of Left Ventricular Workload
Niema M. Pahlevan, Morteza Gharib
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0087122
Abstract: Previous studies have demonstrated the existence of optimization criteria in the design and development of mammalians cardiovascular systems. Similarities in mammalian arterial wave reflection suggest there are certain design criteria for the optimization of arterial wave dynamics. Inspired by these natural optimization criteria, we investigated the feasibility of optimizing the aortic waves by modifying wave reflection sites. A hydraulic model that has physical and dynamical properties similar to a human aorta and left ventricle was used for a series of in-vitro experiments. The results indicate that placing an artificial reflection site (a ring) at a specific location along the aorta may create a constructive wave dynamic that could reduce LV pulsatile workload. This simple bio-inspired approach may have important implications for the future of treatment strategies for diseased aorta.
Purely geometric path integral for spin foams
Atousa Chaharsough Shirazi,Jonathan Engle
Physics , 2013, DOI: 10.1088/0264-9381/31/7/075010
Abstract: Spin-foams are a proposal for defining the dynamics of loop quantum gravity via path integral. In order for a path integral to be at least formally equivalent to the corresponding canonical quantization, at each point in the space of histories it is important that the integrand have not only the correct phase -- a topic of recent focus in spin-foams -- but also the correct modulus, usually referred to as the measure factor. The correct measure factor descends from the Liouville measure on the reduced phase space, and its calculation is a task of canonical analysis. The covariant formulation of gravity from which spin-foams are derived is the Plebanski-Holst formulation, in which the basic variables are a Lorentz connection and a Lorentz-algebra valued two-form, called the Plebanski two-form. However, in the final spin-foam sum, one sums over only spins and intertwiners, which label eigenstates of the Plebanski two-form alone. The spin-foam sum is therefore a discretized version of a Plebanski-Holst path integral in which only the Plebanski two-form appears, and in which the connection degrees of freedom have been integrated out. We call this a purely geometric Plebanski-Holst path integral. In prior work in which one of the authors was involved, the measure factor for the Plebanski-Holst path integral with both connection and two-form variables was calculated. Before one discretizes this measure and incorporates it into a spin-foam sum, however, one must integrate out the connection in order to obtain the purely geometric version of the path integral. To calculate this purely geometric path integral is the principal task of the present paper, and it is done in two independent ways. Gauge-fixing and the background independence of the resulting path integral are discussed in the appendices.
A scanning election microscopic study of the effect of primer on sealant penetration in saliva contaminated enamel
Pahlevan A,Nakhjavani Y,Tavassoli Hojati S
Journal of Dental Medicine , 2010,
Abstract:
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