29 research outputs found
Evaluation of Physicochemical and Antioxidant Properties of Pinus gerardiana Nuts and Oil
For optimal usage of new oil resources with high nutritional values, in this study, one chilgoza pine variety was provided, and assays of physicochemical characteristics of its nut such as moisture, ash, thousand nut weight, oil, protein, hull contents, density, pH and also physicochemical characteristics of its extracted oil by n-hexan solvent such as iodine values, saponification and unsaponification, peroxide, specific weight, acid values, moisture of oil, color (Lovibond) and fatty acid profile and extracted oil characteristics by cold press such as total polyphenols, tocophrols, carotenoids, chlorophylls, sterols, color (Hunterlab), DPPḢ and antioxidant were investigated. Then its effect as a natural antioxidant on rapeseed oil shelf life (without any antioxidant) was studied. The results indicated that chilgoza pine oil is belonged to linoleic-oleic group. Oil of chilgoza pine has α and γ tocopherols and there is no β and δ tocopherols on it. The oil of chilgoza pine, were mixed at two levels of 2% and 5% with rapeseed oil and these mixed were determined by peroxide, TBA and Rancimat indices during 0, 5, 10, 20 and 35 days and compared with control. Statistical results showed no antioxidant effect in shelf life of rapeseed oil at more days. This means that the chilgoza pine oil antioxidant compounds were not enough to prevent oxidative rancidity of rapeseed oil or maybe the antioxidant compounds of nuts were not migrated to oil
Quark-hadron phase transition in a chameleon Brans-Dicke model of brane gravity
In this work, the quark-hadron phase transition in a chameleon Brans-Dicke
model of brane world cosmology within an effective model of QCD is
investigated. Whereas, in the chameleon Brans-Dicke model of brane world
cosmology, the Friedmann equation and conservation of density energy are
modified, resulting in an increased expansion in the early Universe. These have
important effects on quark-hadron phase transitions. We investigate the
evolution of the physical quantities relevant to quantitative descriptions of
the early times, namely, the energy density, , temperature, , and the
scale factor, , before, during, and after the phase transition. We do this
for smooth crossover formalism in which lattice QCD data is used for obtaining
the matter equation of state and first order phase transition formalism. Our
analyses show that the quark-hadron phase transition has occurred at
approximately one nanosecond after the big bang and the general behavior of
temperature is similar in both of two approaches.Comment: 22 pages, 12 figures. arXiv admin note: text overlap with
arXiv:1103.0073 by other author
The effect of purslane hydroextract and zinc on performance, antioxidant capacity and immunity of broiler chickens during summer conditions
Due to negative effects of high ambient temperature, the present study was
conducted to investigate the effects of Portulaca oleracea hydroextract (PHE) and zinc (Zn) on the growth performance and immunity of broiler
chickens reared under high summer ambient temperature conditions. A total of
420 day-old male broiler chickens (Ross 308) were randomly allocated to seven
dietary treatments each replicated four times with 15 birds per replicate. The
basal diet as the control diet was supplemented with 100 mg kg−1
butylated hydroxytoluene (BHT), or 300 and 600 mg kg−1 of PHE,
100 mg kg−1 of zinc and 100 mg kg−1 of zinc plus 300 or
600 mg kg−1 of PHE (ZP300 and ZP600). The result of the present study showed that
Zn, PHE and their combination did not alter daily feed intake and feed
conversion ratio. Although there was a tendency toward an increase in
broiler body weight at 24 and 44 days of age (P = 0.059 and P = 0.061), the body weight of birds fed the basal
diet supplemented with Zn reduced at day 10. The birds fed diets supplemented
with BHT or ZP600 showed lower aspartate aminotransferase (ASAT) and lactate
dehydrogenase activity at 24 days of age (P < 0.05), but it remains lower in
the ZP600 group only for ASAT activity level at day 44. The results of the
present study suggest that dietary PHE and Zn supplementation partially
improved body weight and serum antioxidant capacity, superoxide dismutase
activity and antibody titer against sheep red blood cells and Newcastle
diseases in the broiler chickens during summer conditions.</p
Modeling Local Energy Market for Energy Management of Multi-Microgrids
The diffusion of distributed energy resources (DERs) has changed the supply-demand balance of power systems. One option to modernize the management of the electricity distribution is to operate the distribution system with interconnected micro-grids (MGs). However, the MG participation in wholesale energy and ancillary service markets creates several challenges in the interactions among the energy market managing entities. To solve these problems, local energy markets (LEMs) have been proposed, where the MGs can trade energy with each other under the management of the LEM manager (LEMM) to minimize their operation cost. In this paper, a local energy market is modeled for multi-MGs (MMGs) to minimize the operation cost of MGs individually and their social welfare in cooperation with each other. In such model, the optimal scheduling of the DERs in each MG is done through the market clearing process. To investigate the effectiveness of the proposed approach, the local energy market is applied to a distribution network with three MGs
Interacting New Agegraphic Dark Energy in a Cyclic Universe
The main goal of this work is investigation of NADE in the cyclic universe
scenario. Since, cyclic universe is explained by a phantom phase (),
it is shown when there is no interaction between matter and dark energy, ADE
and NADE do not produce a phantom phase, then can not describe cyclic universe.
Therefore, we study interacting models of ADE and NADE in the modified
Friedmann equation. We find out that, in the high energy regime, which it is a
necessary part of cyclic universe evolution, only NADE can describe this
phantom phase era for cyclic universe. Considering deceleration parameter tells
us that the universe has a deceleration phase after an acceleration phase, and
NADE is able to produce a cyclic universe. Also it is found valuable to study
generalized second law of thermodynamics. Since the loop quantum correction is
taken account in high energy regime, it may not be suitable to use standard
treatment of thermodynamics, so we turn our attention to the result of
\citep{29}, which the authors have studied thermodynamics in loop quantum
gravity, and we show that which condition can satisfy generalized second law of
thermodynamics.Comment: 8 pages, 3 figure