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Search Results: 1 - 10 of 1106 matches for " Vahid Shahbazi "
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A Novel Nanometric Fault Tolerant Reversible Subtractor Circuit
Mozhgan Shiri,Majid Haghparast,Vahid Shahbazi
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: Reversibility plays an important role when energy efficient computations are considered. Reversible logic circuits have received significant attention in quantum computing, low power CMOS design, optical information processing and nanotechnology in the recent years. This study proposes a new fault tolerant reversible half-subtractor and a new fault tolerant reversible full-subtractor circuit with nanometric scales. Also in this paper we demonstrate how the well-known and important, PERES gate and TR gate can be synthesized from parity preserving reversible gates. All the designs have nanometric scales.
Noise Assisted Excitation Energy Transfer in a Linear Toy Model of a Selectivity Filter Backbone Strand
Hassan Bassereh,Vahid Salari,Farhad Shahbazi
Physics , 2014,
Abstract: In this paper, we investigate the effect of noise and disorder on the efficiency of excitation energy transfer (EET) in a $N=5$ sites linear chain with "static" dipole-dipole couplings. In fact, here, the disordered chain is a toy model for one strand of the selectivity filter backbone in ion channels. It is recently discussed that the presence of quantum coherence in the selectivity filter is possible and can play a role in mediating ion-conduction and ion-selectivity in the selectivity filter. The question is "how a quantum coherence can be effective in such structures while the environment of the channel is dephasing (i.e. noisy)?" Basically, we expect that the presence of the noise should have a destructive effect in the quantum transport. In fact, we show that such expectation is valid for ordered chains. However, our results indicate that introducing the dephasing in the disordered chains leads to the weakening of the localization effects, arising from the randomness, and then increases the efficiency of quantum energy transfer. Thus, the presence of noise is crucial for the enhancement of EET efficiency in disordered chains. We also show that the contribution of both classical and quantum mechanical effects are required to improve the speed of energy transfer along the chain. Our analysis may help for better understanding of fast and efficient functioning of the selectivity filters in ion channels.
Comment on Activation of Visual Pigments by Light and Heat (Science 332, 1307-312, 2011)
Vahid Salari,Felix Scholkmann,Farhad Shahbazi,Istvan Bokkon,Jack Tuszynski
Quantitative Biology , 2015,
Abstract: It is known that the Arrhenius equation, based on the Boltzmann distribution, can model only a part (e.g. half of the activation energy) for retinal discrete dark noise observed for vertebrate rod and cone pigments. Luo et al (Science, 332, 1307-312, 2011) presented a new approach to explain this discrepancy by showing that applying the Hinshelwood distribution instead the Boltzmann distribution in the Arrhenius equation solves the problem successfully. However, a careful reanalysis of the methodology and results shows that the approach of Luo et al is questionable and the results found do not solve the problem completely.
Mass Modeling of Sweet Cherry (Prunus avium L.) Fruit with Some Physical Characteristics  [PDF]
Feizollah Shahbazi, Satar Rahmati
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.41001
Abstract:

Horticultural crops with the similar weight and uniform shape are in high demand in terms of marketing value that used as food. The knowledge on existing relationship among the mass, length, width, thickness, volume and projected areas of fruits is useful for proper design of grading machines. A part of this research was aimed to present some physical properties of cherry fruit. In addition, in this study the mass of cherry fruit was predicted with using different physical characteristics in four models including: Linear, Quadratic, S-curve, and Power. According to the results, all properties considered in the current study were found to be statistically significant at the 1% probability level. The best and the worst models for mass prediction of cherry fruit were based on geometric mean diameter and thickness of the cherry with determination coefficients (R2) of 0.938 and 0.484, respectively. At last, mass model of cherry fruit based on first projected area from economical standpoint is recommended.

Educational Levels and Export Performance of Iranian Industries  [PDF]
Vahid Mehrbani
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.88094
Abstract: This paper examines a composite implication of human capital theory and knowledge-based economy literature with regard to export performance of Iranian industries. It is expected that education particularly in higher levels contributes to the expansion of export. This is the hypothesis that is tested by underlying the Branson’s export function and using a panel data of industries with two-digit codes in 2003-2013. Results show that education only in MA (MS) and PhD levels has positive and significant effect on export but lower levels of education have no effect. The coefficients indicate that a 1 percent increase in completion of MA (MS) and PhD degrees will increase the export of industry by 0.18 (0.15) percent respectively. It seems that education contributes to export in higher levels but has no important role in lower levels. It is indicated that the results are somewhat in contrast to filter theory proposed by Arrow (1973).
Relative Gerbes
Zohreh Shahbazi
Mathematics , 2005, DOI: 10.1016/j.geomphys.2005.07.003
Abstract: This paper introduces the notion of ``relative gerbes'' for smooth maps of manifolds, and discusses their differential geometry. The equivalence classes of relative gerbes are further classified by the relative integral cohomology in degree three.
Pre-quantization of Quasi-Hamiltonian Spaces
Zohreh Shahbazi
Mathematics , 2005,
Abstract: This paper develops the pre-quantization of Lie group-valued moment maps, and establishes its equivalence with the pre-quantization of infinite-dimensional Hamiltonian loop group spaces.
Differential Geometry of Relative Gerbes
Zohreh Shahbazi
Mathematics , 2005,
Abstract: This thesis introduces the notion of "relative gerbes" for smooth maps of manifolds, and discusses their differential geometry. The equivalence classes of relative gerbes are classified by the relative integral cohomology in degree three. Furthermore, by using the concept of relative gerbes, the pre-quantization of Lie group-valued moment maps is developed, and its equivalence with the pre-quantization of infinite-dimensional Hamiltonian loop group spaces is established.
Increasing Throughput and Reducing Delay in Wireless Sensor Networks Using Interference Alignment  [PDF]
Vahid Zibakalam, Mohammad HosseinKahaei
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2012, DOI: 10.4236/ijcns.2012.52012
Abstract: With the advent of sensor nodes with higher communication and sensing capabilities, the challenge arises in forming a data gathering network to maximize the network capacity. The channel sharing for higher data transmission leads to interfering problems. The effects of interferences become increasingly important when simultaneous transmissions are done in order to increase wireless network capacity. In such cases, achieving a high throughput and low delay is difficult. We propose a new method that uses interference alignment (IA) technique to mitigate interference effects in Wireless Sensor Networks (WSNs). In IA technique, multiple transmitters jointly encode their signals to intended receivers such that interfering signals are separated and eliminated. Simulation results demonstrate that compared to TDMA algorithms, the proposed method significantly increases the performance of the network delay and throughput by reducing the delay and increasing throughput.
Studying the Status of Marketing Mix (7Ps) in Consumer Cooperatives at Ilam Province from Members’ Perspectives  [PDF]
Purashraf Yasanallah, Vahid Bidram
American Journal of Industrial and Business Management (AJIBM) , 2012, DOI: 10.4236/ajibm.2012.24025
Abstract: Concerning the particular importance of cooperatives in a cooperation system, the author has tried to study the status of marketing mix (7Ps) in cooperatives and to provide proposals to improve the conditions of such cooperatives. This is a descriptive and survey research. Its population consists of all members of consumer cooperatives in Ilam province selected by a ranked sampling method proportionate to the volume of the population by which necessary sample was determined. According to research aim, seven hypotheses are provided and tested by one sample t-test. As a result, hypotheses on price, location, promotion, product, operation management and physical assets which show lower than average status of these elements were confirmed. The only hypothesis that was rejected was the hypothesis related to the personnel element. This shows the proper condition of this element of marketing mix.
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