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Search Results: 1 - 10 of 752 matches for " Navid Rad "
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A Workflow-Based Failure Recovery in Web Services Composition  [PDF]
Omid Bushehrian, Salman Zare, Navid Keihani Rad
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.52014
Abstract: In previous researches in the field of supporting reliability and fault tolerance in web service composition, only low level programming constructs such as exception handling (for example in WSBPEL) were considered. However we believe that the reliability and fault tolerance for composite services must be handled at a higher level of abstraction, i.e. at the workflow level. Therefore a language and technology independent method for fault-tolerant composition of web services is needed. To do this, a fault tolerant workflow is built in which the execution order of the services is determined such that upon a service failure a recovery process with the lowest cost is started. The cost of a service failure includes the cost of failed service and the total costs of roll-baking the previously executed services which are dependent on the failed service. In this article a FSP language is applied to formally specify the workflow.
A test of the circular Unruh effect using atomic electrons
Navid Rad,Douglas Singleton
Physics , 2011, DOI: 10.1140/epjd/e2012-30387-6
Abstract: We propose a test for the circular Unruh effect using certain atoms - fluorine and oxygen. For these atoms the centripetal acceleration of the outer shell electrons implies an effective Unruh temperature in the range 1000 - 2000 K. This range of Unruh temperatures is large enough to shift the expected occupancy of the lowest energy level and nearby energy levels. In effect the Unruh temperature changes the expected pure ground state, with all the electrons in the lowest energy level, to a mixed state with some larger than expected occupancy of states near to the lowest energy level. Examining these atoms at low background temperatures and finding a larger than expected number of electrons in low lying excited levels, beyond what is expected due to the background thermal excitation, would provide experimental evidence for the Unruh effect.
Effect of circular Unruh radiation on bound nucleons and a possible answer to the Lithium 7 puzzle
Navid Rad,Douglas Singleton,Triyanta
Physics , 2013,
Abstract: In the shell model of nuclei, protons and neutrons move in a phenomenological nuclear potential much in the same manner as electrons move in Coulomb based potential in the shell model of atoms. As in the atomic case, the protons and neutrons of certain nuclear energy levels will have a non-zero orbital angular momentum (i.e. l =/= 0) and will therefore experience a centripetal potential and a centripetal acceleration. We advance the hypothesis, based on justification via the path integral formalism, that if one associates an Unruh temperature with this quantum centripetal acceleration then there is a potentially experimentally observable effect on certain nuclei -- the shifting of the naive expectations of the relative occupation of the ground and lowest lying energy levels. In particular we find that this effect should be most prominent in Li-7 nuclei. We speculate that this effect of the Unruh temperature might offer an answer to the Li-7 problem in Big Bang Nucleosynthesis.
Organic functionalization of single-walled carbon nanotubes (SWCNTs) with some chemotherapeutic agents as a potential method for drug delivery
Ardeshir Khazaei, Mohammad Navid Soltani Rad, Maryam Kiani Borazjani
International Journal of Nanomedicine , 2010, DOI: http://dx.doi.org/10.2147/IJN.S11146
Abstract: ganic functionalization of single-walled carbon nanotubes (SWCNTs) with some chemotherapeutic agents as a potential method for drug delivery Original Research (5765) Total Article Views Authors: Ardeshir Khazaei, Mohammad Navid Soltani Rad, Maryam Kiani Borazjani Published Date August 2010 Volume 2010:5 Pages 639 - 645 DOI: http://dx.doi.org/10.2147/IJN.S11146 Ardeshir Khazaei1, Mohammad Navid Soltani Rad2, Maryam Kiani Borazjani1 1Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran; 2Department of Chemistry, Faculty of Basic Sciences, Shiraz University of Technology, Shiraz, Iran Abstract: The grafting of drugs to the single-walled carbon nanotube (SWCNT) was attained by the initial conversion of carboxylic groups in SWCNT to corresponding acyl chlorides. The active acyl chlorides in SWCNT were subsequently mixed with chemotherapeutic agents having NH, NH2, and OH functional groups to afford the formation of relevant amide and ester, respectively. The covalently grafted drugs to SWCNT were identified by infrared and UV–visible spectroscopy and transmission electron microscopy methods. From a clinical aspect, the grafting of drugs to the SWCNT can be used as a new tool and useful method for potential drug delivery in patients.
Lack of Association Between the C677T Single Nucleotide Polymorphism of the MTHFR Gene and Glaucoma in Iranian Patients
Navid Nilforoushan,Sevil Aghapour,Reza Raoofian,Samira Saee Rad
Acta Medica Iranica , 2012,
Abstract: Glaucoma is a major cause of blindness worldwide. A single nucleotide polymorphism of the MTHFR gene (C677T) has been associated with susceptibility to this disease, although this is controversial in the last decade. In this study, the possible association between the MTHFR C677T polymorphism and the risk of developing primary open angle (POAG) and pseudoexfoliation glaucoma (PEXG) was investigated. For this, a prospective study consisting of 73 POAG, 85 PEXG and 90 matched controls was undertaken in an Iranian population. Genomic DNA was extracted from whole blood. Genotyping of all individuals for the MTHFR C677T polymorphism was conducted using the PCR-RFLP technique. Our findings revealed no significant association between the MTHFR C677T polymorphism in POAG and PEXG compared with controls. Consistent with several other studies, our analysis suggests that the MTHFR C677T polymorphism is unlikely to be a factor contributing to the risk of developing specific forms of glaucoma.
Organic functionalization of single-walled carbon nanotubes (SWCNTs) with some chemotherapeutic agents as a potential method for drug delivery
Ardeshir Khazaei,Mohammad Navid Soltani Rad,Maryam Kiani Borazjani
International Journal of Nanomedicine , 2010,
Abstract: Ardeshir Khazaei1, Mohammad Navid Soltani Rad2, Maryam Kiani Borazjani11Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran; 2Department of Chemistry, Faculty of Basic Sciences, Shiraz University of Technology, Shiraz, IranAbstract: The grafting of drugs to the single-walled carbon nanotube (SWCNT) was attained by the initial conversion of carboxylic groups in SWCNT to corresponding acyl chlorides. The active acyl chlorides in SWCNT were subsequently mixed with chemotherapeutic agents having NH, NH2, and OH functional groups to afford the formation of relevant amide and ester, respectively. The covalently grafted drugs to SWCNT were identified by infrared and UV–visible spectroscopy and transmission electron microscopy methods. From a clinical aspect, the grafting of drugs to the SWCNT can be used as a new tool and useful method for potential drug delivery in patients.Keywords: grafting of drugs, solubilization
Detection of Point Sound Source Using Beamforming Technique in Complex Environments  [PDF]
Navid Nassaji, Masoume Shafieian
Open Journal of Acoustics (OJA) , 2018, DOI: 10.4236/oja.2018.82003
Abstract: Detection and localization of acoustic events in an environment are important to protect the military and civilian installations. While there are finite paths of wave propagation in simple or low reverberant environments, in complex environments (e.g. a complex urban environment) obstacles such as terrain or buildings introduce multipath propagations, reflections and diffractions which make source localization challenging. Therefore, numeric results of simulated models (simplified and Fort Benning urban models) of 3D complex environments can highly help in real applications. Some of the conventional beamformer algorithms have been used in order to localize point sound source. Analyzing results shows that MRCB beamformer has better performance than others in this issue and its accuracy superiority is more than 3 m in simplified urban model and 5 m in Fort Benning urban model with respect to the SOC. Moreover, due to possible uncertainties between the numerical model and the actual environment such as squall effect, temperature gradient etc., sensitivity of the beamformers to temperature gradient is investigated which shows higher robustness of SOC beamformer than the MRCB beamformer. According to the results, due to gradient temperature uncertainty the accuracy degradation of the SOC is about 1m while in MRCB it alters from 0.5 m to 20 m approximately at all SNRs. COMSOL Multiphysics has been used to numerically simulate the environment of wave propagation.
Single Beam Z-Scan Measurement of Nonlinear Refractive Index of Crude Oils  [PDF]
Adeleh Granmayeh Rad
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.55038
Abstract:

Nonlinear properties of two different crude oils from west-south Iran reservoirs have been investigated using the single beam Z-scan technique. The nonlinear refractive indices of the samples were measured by use of diode laser in the CW regime and at the wavelength 660 nm. The experiment results showed that the samples have large and negative refractive index nonlinear refraction coefficient. These results showed that the crude oil has significant nonlinear properties and it could be a candidate for photonic and nonlinear optical devices and also this information can be used in petroleum science and oceanology and etc.

A New Method for Recognition of Arcing Faults in Transmission Lines using Wavelet Transform and Correlation Coefficient
Navid Ghaffarzadeh
Indonesian Journal of Electrical Engineering and Informatics , 2013,
Abstract: In this paper a novel method based on discrete wavelet transform and correlation coefficient is presented for distinguishing between arcing and permanent faults. The algorithm includes offline and online processing. In the offline, discrete wavelet transform is used to decompose typical faulted phase voltage waveforms during arcing faults. An index is then defined and computed. The index is based on the normalised energy of detail coefficients at resolution levels 1 to 14. The online processing consists of capturing the faulted phase voltage waveform using a 20 kHz sampling rate, and decomposing it by db4. Finally, arcing faults are distinguished from permanent faults based on correlation coefficient of the computed index of the pre-stored typical arcing faults and a recorded indistinct signal. The effectiveness of the approach has been tested for numerous arcing and permanent fault conditions on a transmission line using the Electromagnetic transient Program (EMTP) software tool. The simulation results show the capability of the proposed method in distinguishing between arcing faults from permanent faults.
Acoustic Reflex Measurements in Normal, Cochlear, and Retrocochlear Lesions -Part1
Navid Shahnaz
Audiology , 1992,
Abstract: The cut off points of 90th percentile of acoustic reflex thresholds were determined in the normal and sensory hearing loss.All subjects had measurable hearing(ANSI-1969≤110 dBHL) in three frequencies of 500,1000 and 2000Hz.While hearing loss was more than 55dB, The cut off point was higher in studies that NR responses was included.In cases that hearing loss was less than 75dB, 90th percentile can be used in diganosis of retrochochlear lesions.Since Acoustic reflexes are absent in both mentioned pathologies in greater amount of hearing loss,It would be less efficient in diffrential diganisis of cochlear and retrochochlear lesions to use acoustic reflex thresholds under the mentioned circumstances.
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