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  • 1
    Language: English
    In: The journal of physical chemistry. A, 28 March 2013, Vol.117(12), pp.2499-507
    Description: The first and second electronic excited states (S1 and S2) of protonated phenanthrene and protonated pyrene, having the ππ* nature, are strongly red-shifted compared to corresponding electronic transitions in neutral homologues. The CC2 calculations identify an out-of-plane deformation as the most important photochemical reaction coordinate in protonated phenanthrene as well as protonated benzene. It was shown that the excited S1 states of protonated phenanthrene and protonated benzene are unstable via a torsional motion, which provides a fast access to a S1-S0 conical intersection. From the conical intersection, a barrier-less reaction path directs the system back to the minimum of the S0 potential-energy surface. In contrast to the most stable isomer of protonated phenanthrene, the most stable structure of protonated pyrene shows planar structure in both the S1 and S2 excited states, without considerable geometry deformations.
    Keywords: Chemical Kinetics -- Analysis ; Electron Configuration -- Analysis ; Phenanthroline -- Chemical Properties ; Phenanthroline -- Structure ; Surface Energy -- Measurement;
    ISSN: 10895639
    E-ISSN: 1520-5215
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  • 2
    Language: English
    In: Journal of Chromatography A, August 24, 2012, Vol.1252, p.1(7)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.chroma.2012.06.063 Byline: Behnaz Daneshvand, Katayoun Mahdavi Ara, Farhad Raofie Keywords: Fatty acid; Quince (Cydonia oblonga Miller) seed oil; Supercritical fluid extraction (SFE); Ultrasound-assisted extraction (UAE); Experimental design; Response surface methodology (RSM) Abstract: a* SFE and UAE of quince seed were investigated. a* The effects of different experimental parameters on extraction recovery were studied using RCCD and RSM design. a* The major components of quince seed were: Linoleic, Palmitic, Oleic, Stearic and Eicosanoic acids. Author Affiliation: Department of Chemistry, Faculty of Science, Shahid Beheshti University, G. C., Tehran, Iran Article History: Received 4 April 2012; Revised 15 June 2012; Accepted 18 June 2012 Article Note: (footnote) [star] Presented at the 12th International Symposium on Hyphenated Techniques in Chromatography and Hyphenated Chromatographic Analyzers (HTC-12), Bruges, Belgium, 31 January-3 February 2012.
    Keywords: Saturated Fatty Acids -- Comparative Analysis ; Saturated Fatty Acids -- Methods ; Petroleum Mining -- Comparative Analysis ; Petroleum Mining -- Methods ; Chromatography -- Comparative Analysis ; Chromatography -- Methods
    ISSN: 0021-9673
    Source: Cengage Learning, Inc.
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  • 3
    In: Journal of Applied Polymer Science, 15 April 2015, Vol.132(15), pp.n/a-n/a
    Description: In the present work we studied the flow induced multiwalled carbon nanotube (MWCNT) orientation and the mechanisms governing the kinetics of nanotube reorientation and three‐dimensional network restructuring in poly(ethylene oxide) (PEO)/MWCNT nanocomposites. For this purpose, the linear and nonlinear viscoelastic experiments including frequency sweep, time sweep and transient tests were performed on PEO/MWCNT samples varying in MWCNT content. The extent as well as kinetics of network restructuring was found to be strongly dependent upon the amount of preshearing (shear rate and shearing time) and MWCNT concentration. The results also showed two mechanisms for structural recovery; a fast restructuring at the beginning due to rejoining of clusters and unoriented adjacent nanotube and much slower recovery in the longer annealing times due to Brownian motion. The latter mechanism was found to be uncompleted over 3600 s annealing. This was supported by (orientation tensors) calculated based on transmission electron micrograph. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. , , 41753.
    Keywords: Kinetics ; Rheology ; Structure ; Property Relations
    ISSN: 0021-8995
    E-ISSN: 1097-4628
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  • 4
    Language: English
    In: Psychiatry Research, 28 February 2015, Vol.225(3), pp.580-587
    Description: The Parental Bonding Instrument (PBI) is a widely used self-report measure for quantifying key parenting styles as perceived by the child during its first 16 years. While its development study identified two key parental dimensions, subsequent studies have variably confirmed those two or argued for one or more additional parental constructs. We developed a Persian translation of the PBI and administered it to a sample of 340 high school students. The construct validity of the Persian PBI was examined by Exploratory Factor Analysis while Confirmatory Factor Analysis was used to identify the most adequate model. Analyses of the Persian PBI favored a four-factor model for both parental forms. The Persian PBI has a factorial structure consistent with constructs identified in western cultures, as well as high internal consistency and test–retest reliability. Multivariate analyses indicated significant differences between boys and girls across some factors. The PBI appears an acceptable and appropriate measure for quantifying parent–child bonding in Iranian samples.
    Keywords: Factor Structure ; Pbi ; Persian ; Psychometric Properties ; Reliability ; Validity ; Medicine
    ISSN: 0165-1781
    E-ISSN: 1872-7123
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  • 5
    Language: English
    In: The journal of physical chemistry. B, 09 June 2011, Vol.115(22), pp.7182-9
    Description: We use numerical simulations to study the phase behavior of a system of purely repulsive soft dumbbells as a function of size ratio of the two components and their relative degree of deformability. We find a plethora of different phases, which includes most of the mesophases observed in self-assembly of block copolymers but also crystalline structures formed by asymmetric, hard binary mixtures. Our results detail the phenomenological behavior of these systems when softness is introduced in terms of two different classes of interparticle interactions: (a) the elastic Hertz potential, which has a finite energy cost for complete overlap of any two components, and (b) a generic power-law repulsion with tunable exponent. We discuss how simple geometric arguments can be used to account for the large structural variety observed in these systems and detail the similarities and differences in the phase behavior for the two classes of potentials under consideration.
    Keywords: Condensed Matter - Soft Condensed Matter;
    ISSN: 15206106
    E-ISSN: 1520-5207
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  • 6
    Language: English
    In: Energy Policy, Dec, 2012, Vol.51, p.184-191
    Keywords: Economic Growth -- Comparative Analysis ; Air Pollution Control -- Comparative Analysis ; Sustainable Development -- Research ; Atmospheric Carbon Dioxide -- Influence
    ISSN: 0301-4215
    Source: Cengage Learning, Inc.
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  • 7
    Language: English
    In: Energy Policy, Dec, 2012, Vol.51, p.184-191
    Keywords: Economic Growth -- Comparative Analysis ; Air Pollution Control -- Comparative Analysis ; Sustainable Development -- Research ; Atmospheric Carbon Dioxide -- Influence
    ISSN: 0301-4215
    Source: Cengage Learning, Inc.
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  • 8
    Language: English
    In: Journal of Hydrology, Feb 8, 2012, Vol.418-419, p.61(17)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jhydrol.2009.02.021 Byline: Behnaz Khakbaz, Bisher Imam, Kuolin Hsu, Soroosh Sorooshian Keywords: Distributed hydrologic modeling; Calibration; A priori parameters; Multi-sensor precipitation; Streamflow simulation Abstract: Modeling the effect of spatial variability of precipitation and basin characteristics on streamflow requires the use of distributed or semi-distributed hydrologic models. This paper addresses a DMIP 2 study that focuses on the advantages of using a semi-distributed modeling structure. We first present a revised semi-distributed structure of the NWS SACramento Soil Moisture Accounting (SAC-SMA) model that separates the routing of fast and slow response runoff components, and thus explicitly accounts for the differences between the two components. We then test four different calibration strategies that take advantage of the strengths of existing optimization algorithms (SCE-UA) and schemes (MACS). These strategies include: (1) lumped parameters and basin averaged precipitation, (2) semi-lumped parameters and distributed precipitation forcing, (3) semi-distributed parameters and distributed precipitation forcing and (4) lumped parameters and basin averaged precipitation, modified using a priori parameters of the SAC-SMA model. Finally, we explore the value of using discharge observations at interior points in model calibration by assessing gains/losses in hydrograph simulations at the basin outlet. Our investigation focuses on two key DMIP 2 science questions. Specifically, we investigate (a) the ability of the semi-distributed model structure to improve stream flow simulations at the basin outlet and (b) to provide reasonably good simulations at interior points. The semi-distributed model is calibrated for the Illinois River Basin at Siloam Springs, Arkansas using streamflow observations at the basin outlet only. The results indicate that lumped to distributed calibration strategies (1 and 4) both improve simulation at the outlet and provide meaningful streamflow predictions at interior points. In addition, the results of the complementary study, which uses interior points during the model calibration, suggest that model performance at the outlet can be further improved by using a semi-distributed structure calibrated at both interior points and the outlet, even when only a few years of historical record are available. Author Affiliation: Center for Hydrometeorology and Remote Sensing, Department of Civil and Environmental Engineering, University of California, Irvine, E 4130 Engineering Gateway, Irvine, CA 92697, USA
    Keywords: Streamflow -- Models ; Streamflow -- Analysis ; Precipitation (Meteorology) -- Models ; Precipitation (Meteorology) -- Analysis ; Algorithms -- Models ; Algorithms -- Analysis ; Soil Moisture -- Models ; Soil Moisture -- Analysis ; Precipitation Variability -- Models ; Precipitation Variability -- Analysis ; Hydrology -- Models ; Hydrology -- Analysis ; Runoff -- Models ; Runoff -- Analysis ; Optimization Theory -- Models ; Optimization Theory -- Analysis
    ISSN: 0022-1694
    Source: Cengage Learning, Inc.
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  • 9
    Language: English
    In: European Journal of Pharmacology, 15 October 2015, Vol.765, pp.316-321
    Description: Diabetes has various interactions with ischemic heart diseases. Troxerutin, a flavonoid, owns outstanding pharmacological potentials in cardiovascular medicine. The purpose of this study was to investigate the effects of troxerutin on phosphorylation of GSK-3β protein and apoptosis induced by myocardial ischemia–reperfusion injury in healthy and diabetic hearts. Male Wistar rats ( =36, 250–300 g) were randomly divided into four groups: healthy, diabetic, healthy-troxerutin and diabetic-troxerutin. Diabetes was induced by a single injection of streptozotocin (50 mg/kg; ip) and the diabetic period was lasted for ten weeks. Six weeks after induction of diabetes, troxerutin-treated groups received 150 mg/kg/day troxerutin by oral gavage for 4 weeks. The rats’ hearts were transferred to the Langendorff apparatus and then subjected to 30 min regional ischemia followed by 45 min reperfusion. Supernatants of the left ventricle were used to measure the levels of cardiac troponin-I (cTnI) by ELISA, total and phosphorylated form of GSK-3β by western blotting and tissue apoptosis by TUNEL assay. Troxerutin administration significantly decreased the cTnI levels in healthy and diabetic groups, as compared to the corresponding controls ( 〈0.05). In addition, troxerutin significantly increased the level of phosphorylated form and the ratio of phosphorylated to total form of GSK-3β in diabetic and control groups ( 〈0.05). Tissue apoptosis level and apoptotic index also showed a significant decrease after administration of troxerutin in control and diabetic groups ( 〈0.05). The findings indicated that the attenuation of GSK-3β activity and subsequent reduction of apoptosis by troxerutin play significant roles in its cardioprotection on reperfusion injuries.
    Keywords: Ischemic Heart Disease ; Diabetes ; Troxerutin ; Ischemia–Reperfusion Injury ; Pharmacy, Therapeutics, & Pharmacology
    ISSN: 0014-2999
    E-ISSN: 1879-0712
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  • 10
    In: Journal of Applied Polymer Science, 05 August 2014, Vol.131(15), pp.n/a-n/a
    Description: This research evaluates the effects of PLA/PP blend ratio and Lyocell/hemp mixture ratio on the morphology, water absorption, mechanical and thermal properties of PLA‐based composites. The composites were fabricated with 30 mass % hemp using compression moulding. As a reference composites made from PP were also studied. Combining of hemp and Lyocell in PLA composite leads to the reduction of moisture absorption and can improve the impact, tensile, flexural properties when compared with PLA/hemp. Composite based on the PLA/PP blend‐matrix could not improve the tensile and flexural properties compared with PLA/hemp, however; the lighter composite with better impact properties was obtained. The crystallization temperature of the PLA‐PP/hemp increased compared with pure PLA. This result was also confirmed by the SEM micrographs. The moisture absorption of PLA‐PP/hemp was higher than PLA/hemp. Based on theoretical analysis of DMTA data, there was favorable adhesion in all composites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. , , 40534.
    Keywords: Biopolymers And Renewable Polymers ; Composites ; Fibers ; Mechanical Properties ; Molding
    ISSN: 0021-8995
    E-ISSN: 1097-4628
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