فهرست مطالب

  • Volume:36 Issue:3, 2012
  • A3
  • تاریخ انتشار: 1391/06/19
  • تعداد عناوین: 12
|
  • G. H. Bordbar, S. Hosseini Page 225
    In this paper the lowest order constrained variational (LOCV) method has been used for calculation of liquid 􀬷􀜪􀝁 along different isentropic paths employing the Aziz potential. Some thermodynamic properties such as energy per particle, pressure, temperature, chemical potential, velocity of sound, adiabatic index and compressibility for normal liquid � have been calculated. Our results indicate that the sound velocity is always less than the velocity of light in vacuum (c) showing that all calculated equations of state obey the causality condition. Finally, our calculations show that the adiabatic index is not constant and its value depends on both density and entropy of the system.
    Keywords: Liquid, isentropic process, velocity of sound, adiabatic index, compressibility
  • M. R. Vaziri, A. L. Arab Page 231
    Two new species of an Arbacioid echinoid, genus Goniopygus, are reported for the first time from Aptian sediments of Baghin area, Kerman, Iran. The main features of the species lie in apical disc and peristome diameter. In Goniopygus triangularis sp. nov., the periperoct is triangular in shape with three small, sunken tubercles, located alternatively adjacent to the periperoct, while Goniopygus annularis sp. nov. is characterized by having a circular periperoct without any sunken tubercle. Also, Goniopygus triangularis has a wider peristome than Goniopygus annularis. In both species sexual dimorphism is not conspicuous. They lived in restricted to low - moderate energy environments.
    Keywords: Echinoids, Goniopygus, Cretaceous, Kerman, Iran
  • M. H. Abnosi, M.Solemani Mehranjani, H. R. Momeni, M. Mahdiyeh Najafabadi, M. Barati, E. Shojafar Page 239
    P-Nonylphenol (p-NP) as a non ionic surfactant is used in many industries such as pesticides, cosmetics, detergents and so on. Our previous study showed that the p-NP causes reduction in viability of the rats Bone Marrow Mesenchymal Stem cells (MSCs). The aim of the present study was to investigate the mechanism of the cell death due to p-NP exposure. The cells, after 3rd passage were treated with 100μM p NP for a period of 36 hrs, then using TUNEL, caspase and comet assay as well as fluorescent dye like Hochest, acridine orange and monodansylcadaverin (MDC) staining the mechanism of cell death was studied. The results of this study showed that the p-NP treated cells were TUNEL positive and also, activated caspase-3 enzyme in their cytoplasm was visualized. Hochest staining showed chromatin condensation and nuclei breakage, at which the nuclear breakage was further confirmed by comet assay. In addition, staining the cells with acridine orange revealed that the cytoplasm of the treated cells contained numerous vesicles. Furthermore, staining of the cells with MDC showed the presence of the double layer autophagic vacuoles. In conclusion, the induced cell death due to p-NP toxicity was determined to be caspase dependent apoptosis as well as autophagy.
    Keywords: Apoptosis, autophagy, caspase, 3, monodansylcadaverin, p, Nonylphenol
  • R. Malekzadeh, Viayeh Page 245
    Two Iranian strains of Brachionus rotifers were cultured under different food and salinity regimes. The rotifers were fed with five algal types (freshwater and marine Chlorella vulgaris, Nannochloropsis occulata, Isochrysis galbana and Scenedesmus obliquus) at three different salinities (5, 15 and 25 g/L) and their reproductive and growth parameters were assessed. The maximum number of ovigerous females (73 ± 7 ind/mL), population density (354 ± 3 ind/mL) and specific growth rate (0.75 ± 0.01 / day) were obtained for the rotifers fed with freshwater Chlorella. In Zbl strain, minimum growth rate (0.04 ± 0.05/ day) and population density (13 ± 4 ind/mL) were for the rotifers fed with Isochrysis at 25 g/L, while in Ba strain, population growth and density were null after feeding Scenedesmus at 5 g/L. The rotifer strains were differentially affected by salinity of medium, and Zbl and Ba strains had their maximum growth rates and population densities at 5 and 25 g/L, respectively. Analysis of variance showed significant effects of food type, salinity and their combined effects on all the estimated parameters, while rotifer strain and its interaction with food type and salinity significantly affected growth rate and population density of the rotifers (P < 0.05).
    Keywords: Rotifer, Brachionus, reproduction, growth, salinity, food
  • M. Zakarianezhad, S. M. Habibi, Khorassani, M. T. Maghsoodlou, B. Makiabadiand, H.Ghasempour Page 251
    Kinetic studies were made of the reactions between triphenylphosphine 1, dialkyl acetylenedicarboxylates 2 in the presence of NH-acid, such as maleimid (as a protic/nucleophilic reagent) 3. To determine the kinetic parameters of the reactions, they were monitored by UV spectrophotometery. The second order fits were automatically drawn and the values of the second order rate constant (k2) were automatically calculated using standard equations within the program. All reactions were repeated at different temperature range, the dependence of the second order rate constant (ln k2) and (ln k2/T) on reciprocal temperature was in a good agreement with Arrhenius and Eyring equations. This provided the relevant plots to calculate the activation parameters (Ea,  , S and G) of all reactions. Furthermore, useful information was obtained from studies of the effect of solvent, structure of reactants (dialkyl acetylenedicarboxylates) and also concentration of reactants on the reaction rates. The proposed mechanism was confirmed according to the obtained results and steady state approximation, and the first and third steps (k2, k3) of all reactions were recognized as rate determining and fast steps, respectively on the basis of experimental data.
    Keywords: Stable phosphorus ylides, dialkyl acetylenedicarboxylates, NH, acid, heterocyclic compounds, kinetic studies
  • N. Farhangkhah, N. Bostani Page 259
    The asymptotically AdS solutions of the Einstein gravity with hyperbolic horizons in the presence of So(n(n-1)/2- 1,1) Yang-Mills fields governed by the non-Abelian Born-Infeld Lagrangian are presented. We investigate the properties of these solutions as well as their asymptotic behavior in various dimensions. The properties of these kinds of solutions are like the Einstein-Yang-Mills solutions. But the differences seem to appear in the role of the mass, charge and born-Infeld parameter β, in the solutions. For example, in Einstein-Yang Mills theory the solutions with non-negative mass cannot present an extreme black hole while that of in Einstein-Yang-Mills-Born Infeld theory can. Also, the singularities in higher dimensional Einstein-Yang-Mills theory for non-negative mass are always spacelike, while depending on choosing the parameters, we can find timelike singularities in the similar case of Einstein-Yang-Mills-Born-Infeld theory. We also extend the solutions of Einstein to the case of Gauss- Bonnet and third order Lovelock gravities. It is shown that, these solutions in the limits of β0, and β, represent pure gravity and gravity coupled with Yang-Mills fields, respectively.
    Keywords: Lovelock gravity, Einstein gravity, Gauss, Bonnet gravity, Yang Mills field, Born Infeld theory
  • B. Bidabad, S. Hedayatian Page 267
    Using the electrostatic capacity of a condenser, the existence of a distance function on a Finsler space is discussed. This distance function divides Finsler spaces into the two classes, denoted here by I and II. The topology generated by this distance on the Finsler spaces of class II coincides with its intrinsic topology. This work provides a natural extension of mathematical analysis tools needed for developing some prominent features of differential geometry in the large.
    Keywords: Conformal, capacity, condenser, Finsler metrics, potential analysis
  • G. M. Bahaa, M. M. Tharwat Page 277
    In this paper, the optimal boundary control problem for distributed parabolic systems, involving second order operator with an infinite number of variables, in which constant lags appear in the integral form both in the state equations and in the boundary condition is considered. Some specific properties of the optimal control are discussed.
    Keywords: Optimal boundary control, parabolic systems, time delays, distributed control problems, Neumann conditions, existence, uniqueness of solutions, operator with an infinite number of variables
  • M. R. Farhangdoost Page 293
    In this paper, by definition of exponential map of the Lie groups the concept of exponential map of generalized Lie groups is introduced. This has a powerful generalization to generalized Lie groups which takes each line through the origin to an order product of some one-parameter subgroup. We show that the exponential map is a 􀜥􀮶- map. Also, we prove some important properties of the exponential map for generalized Lie groups. Under the identification, it is shown that the derivative of the exponential map is the identity map. One of the most powerful applications of these exponential maps is to define generalized adjoint representation of a top space, so we show that this representation is a 􀜥􀮶- map. Finally, invariant forms are introduced on a generalized Lie group. We prove that every left invariant 􀝇-form are introduced on a generalized Lie group 􀜶 with the finite number of identity elements is 􀜥􀮶. At the end of this paper, for compact connected generalized Lie group 􀜶 with the finite number of identity elements and dimension 􀝊, we show that every left invariant 􀝊-form on 􀜶 is right invariant 􀝊-form.
    Keywords: Lie group, exponential map, differential invariant form
  • F. Ozdemir, E. O. Canfes Page 299
    In this study, 2n -dimensional (n > 2) generalized conformally recurrent Kaehlerian Weyl spaces and generalized conharmonicaly recurrent Kaehlerian Weyl spaces are defined. It is proved that a Kaehlerian Weyl space is generalized conformally recurrent if and only if it is generalized recurrent.Also, it is shown that a Kaehlerian Weyl space will be generalized recurrent if and only if it is generalized conharmonically recurrent.
    Keywords: Kaehlerian Weyl space, recurrent Weyl space, generalized recurrency, conformally recurrency, conharmonic recurrency
  • E. Y. Gokpinar, F. Gokpinar, H. Bayrak Page 305
    Durbin's rank test is widely used for testing treatment effects in Balanced Incomplete Block Designs (BIBDs) which have wide applications in sensory analysis. This test is failed for BIBDs when ties data occur. An adjusted version of Durbin rank test for this kind of data is given to solve this problem. Chi-square approximation, which is commonly used for this test, is not adequate for small BIBDs. For this case, we investigate permutation approach for adjusted Durbin rank test. Also, in this study the tests used in BIBDs are compared by simulation study for tied data, which have not been discussed in the sensory literature.
    Keywords: Balanced incomplete block design, permutation approach, adjusted Durbin rank test
  • Z. Wei, X. Jie, Hua Page 311
    In this paper, a compound binomial risk model in the presence of a constant dividend barrier is studied. Two types of individual claims, main claims and by-claims, are defined, where every by-claim is induced by the main claim randomly and may be delayed for one time period with a certain probability. In the evaluation of the moments of the present value of dividends, the interest rates are assumed to follow a Markov chain with finite state space. A system of differential equations with certain boundary conditions satisfied by the nth moment of the present value of total dividend payments prior to ruin, given the initial environment state, is derived. We arrive at a general formula which allows us to evaluate the moments of the total discounted dividends recursively in terms of the lower order moments. Assuming the claim sizes are Kh distributed or the claim size distributions have finite support, we are able to solve for all necessary components in the general recursive formula and obtain some other results of interest. We present several numerical examples which illustrate the applicabilities of our main results and the effects of the by-claims on the moments of the present value of dividends.
    Keywords: Compound binomial risk model, delayed claim, dividend barrier, discounted dividend payments, stochastic interest rate, Markov chain