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21.
New existing results for a system of nonlinear third-order differential equation via fixed point index
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Chengbo Zhai Li Zhao Shunyong Li Hamidreza Marasi 《Journal of Applied Analysis & Computation》2018,8(6):1694-1706
By using fixed point index theory, we investigate a system of nonlinear third-order differential equation. We give some sufficient conditions for the existence of at least one or two positive solutions to the system of nonlinear third-order differential equation. As applications, we also present two examples to demonstrate the main results. 相似文献
22.
Hamidreza Bojari Azim Malekzadeh Mahnaz Ghiasi Ahmad Gholizadeh Ramin Azargohar Ajay Kumar Dalai 《Crystal Research and Technology》2013,48(6):355-362
Lanthanum oxide nanoparticles were synthesized via thermal decomposition method of the lanthanum nitrate in the presence of citric acid or starch as emulsifier. The effects of emulsifier and calcination temperature were investigated on the phase transformation and particle size distribution of the products. La2O3 nanoparticles were synthesized by drying lanthanum precursor and emulsifier solution, followed by calcination process at 600 and 900°C, respectively. Products were characterized by Fourier Transform Infrared (FT‐IR) spectroscopy, X‐ray diffraction (XRD), thermal analysis (TG/DTA) and nitrogen adsorption method (porous characteristics). The morphology of the samples analyzed using scanning electron microscopy (SEM). Average crystallite size of the products was calculated by XRD data and average particle size was measured from the TEM micrographs. Lanthanum dioxycarbonate in different forms of the tetragonal and monoclinic is crystallized in the presence of citric acid and starch during the calcination at 600°C, respectively. The hexagonal structure, however, is detected as the only crystalline phase formed by calcination at 900°C. 相似文献
23.
Hamidreza Enshaei Brenda G. Molina Luis J. del Valle Francesc Estrany Carme Arnan Jordi Puiggalí Núria Saperas Carlos Alemn 《Macromolecular bioscience》2019,19(8)
Ambroxol is a pharmacological chaperone (PC) for Gaucher disease that increases lysosomal activity of misfolded β‐glucocerebrosidase (GCase) while displaying a safe toxicological profile. In this work, different poly(ε‐caprolactone) (PCL)‐based systems are developed to regulate the sustained release of small polar drugs in physiological environments. For this purpose, ambroxol is selected as test case since the encapsulation and release of PCs using polymeric scaffolds have not been explored yet. More specifically, ambroxol is successfully loaded in electrospun PCL microfibers, which are subsequently coated with additional PCL layers using dip‐coating or spin‐coating. The time needed to achieve 80% release of loaded ambroxol increases from ≈15 min for uncoated fibrous scaffolds to 3 days and 1 week for dip‐coated and spin‐coated systems, respectively. Furthermore, it is proven that the released drug maintains its bioactivity, protecting GCase against induced thermal denaturation. 相似文献
24.
Karimi-Alavijeh H Baghban MA Parsanasab GM Sarailou E Gharavi A Javadpour S 《Optics letters》2008,33(18):2152-2154
We have fabricated in-plane slanted gratings on azo-functionalized polymeric films using a fast, direct-writing method. By properly adjusting the resonance, these gratings can be used as 90 degrees integrated reflectors and add/drop filters in the plane of the film. We have produced an attenuation of 14.8 dB at 1560.2 nm with a FWHM of 6.47 nm. Also, a signal of 1548 nm wavelength was added to the output from a different direction. Any light shifted from the resonance will pass through the filter undisturbed. 相似文献
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26.
Jonas Volmer S. Hamidreza Arabi Christian Henning Marcus A. Glomb Dariush Hinderberger 《Macromolecular bioscience》2023,23(3):2200487
The changes of technological properties of albumin-based hydrogels induced by increasing degrees of post-translational modification of the protein are reported. Maillard-type modification of amino acids arginine and lysine of albumin is achieved through glyoxal as an α-dicarbonyl compound. The degrees of modification are fine-tuned using different molar ratios of glyoxal. Hydrogels are thermally induced by heating highly concentrated precursor solutions above the protein's denaturation temperature. While the post-translational modifications are determined and quantified with mass spectrometry, continuous-wave (CW) electron paramagnetic resonance (EPR) spectroscopy shed light on the protein fatty acid binding capacity and changes thereof in solution and in the gel state. The viscoelastic behavior is characterized as a measure of the physical strength of the hydrogels. On the nanoscopic level, the modified albumins in low concentration solution reveal lower binding capacities with increasing degrees of modification. On the contrary, in the gel state, the binding capacity remains constant at all degrees of modifications. This indicates that the loss of fatty acid binding capacity for individual albumin molecules is partially compensated by new binding sites in the gel state, potentially formed by modified amino acids. Such, albumin glycation offers a fine-tuning method of technological and nanoscopic properties of these gels. 相似文献
27.
Acoustic Detection: Acoustic Detection of Phase Transitions at the Nanoscale (Adv. Funct. Mater. 4/2016)
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28.
Hassan Keypour Reza Azadbakht Hadi Amiri Rudbari Alireza Heydarinekoo Hamidreza Khavasi 《Transition Metal Chemistry》2009,34(8):835-839
Three new potentially hexadentate N4O2 Schiff-base ligands (H2L1, H2L2 and H2L3) were prepared from the reaction of the polyamines N,N′-bis(2-aminophenyl)-1,2-ethanediamine (L1), N,N′-bis(2-aminophenyl)-1,3-propanediamine (L2) and N,N′-bis(2-aminophenyl)-1,4-butanediamine (L3), respectively with salicylaldehyde. Reaction of the Schiff bases with Ni(II) salts in the presence of N(Et)3 gave the neutral complexes [NiL4], [NiL5] and [NiL6]. Ni(II) complexes of the polyamines were also prepared. One of complexes [Ni(L1)(MeCN)2](ClO4)2·MeCN has been characterized through X-ray diffraction methods. 相似文献
29.
This paper presents a multiobjective evolutionary algorithm (MOEA) capable of handling stochastic objective functions. We
extend a previously developed approach to solve multiple objective optimization problems in deterministic environments by
incorporating a stochastic nondomination-based solution ranking procedure. In this study, concepts of stochastic dominance
and significant dominance are introduced in order to better discriminate among competing solutions. The MOEA is applied to
a number of published test problems to assess its robustness and to evaluate its performance relative to NSGA-II. Moreover,
a new stopping criterion is proposed, which is based on the convergence velocity of any MOEA to the true Pareto optimal front,
even if the exact location of the true front is unknown. This stopping criterion is especially useful in real-world problems,
where finding an appropriate point to terminate the search is crucial. 相似文献
30.
Hamidreza?SalimiEmail author Karl-Heinz?Wolf Johannes?Bruining 《Transport in Porous Media》2012,91(2):391-422
This article deals with developing a solution approach, called the non-isothermal negative saturation (NegSat) solution approach.
The NegSat solution approach solves efficiently any non-isothermal compositional flow problem that involves phase disappearance,
phase appearance, and phase transition. The advantage of the solution approach is that it circumvents using different equations
for single-phase and two-phase regions and the ensuing unstable procedure. This paper shows that the NegSat solution approach
can also be used for non-isothermal systems. The NegSat solution approach can be implemented efficiently in numerical simulators
to tackle modeling issues for mixed CO2–water injection in geothermal reservoirs, thermal recovery processes, and for multicontact miscible and immiscible gas injection
in oil reservoirs. We illustrate the approach by way of example to cold mixed CO2–water injection in a 1D geothermal reservoir. The solution is compared with an analytical solution obtained with the wave-curve
method (method of characteristics) and shows excellent agreement. A complete set of simulations is carried out, which identifies
six bifurcations. The two main bifurcations are (1) when the most downstream compositional wave is replaced by a compositional
shock and (2) when an extra Buckley–Leverett rarefaction appears. The plot of the useful energy (exergy) versus the CO2 storage capacity shows a Z-shape. The top horizontal part represents a branch of high exergy recovery/relatively lower storage capacity, whereas the
bottom part represents a branch of lower exergy recovery/higher storage capacity. 相似文献