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111.
Keshavarz MH Pouretedal HR Shokrolahi A Zali A Semnani A 《Journal of hazardous materials》2008,160(1):142-147
The paper presents a new method for activation energy or the Arrhenius parameter E(a) of the thermolysis in the condensed state for different polynitro arenes as an important class of energetic molecules. The methodology assumes that E(a) of a polynitro arene with general formula C(a)H(b)N(c)O(d) can be expressed as a function of optimized elemental composition as well as the contribution of specific molecular structural parameters. The new method can predict E(a) of the thermolysis under conditions of Soviet Manometric Method (SMM), which can be related to the other convenient methods. The new correlation has the root mean square (rms) and the average deviations of 13.79 and 11.94kJ/mol, respectively, for 20 polynitro arenes with different molecular structures. The proposed new method can also be used to predict E(a) of three polynitro arenes, i.e. 2,2',2',4,4',4',6,6',6'-nonanitro-1,1':3',1'-terphenyl (NONA), 3,3'-diamino-2,2',4,4',6,6'-hexanitro-1,1'-biphenyl-3,3'-diamine (DIPAM) and N,N-bis(2,4-dinitrophenyl)-2,4,6-trinitroaniline (NTFA), which have complex molecular structures. 相似文献
112.
Mustafa Vahabzadeh Dolama Akbar Ghaffarpour Rahbar 《International Journal of Wireless Information Networks》2012,19(1):62-72
Reducing the volume of location updates and cost of searching for location information are two important issues for tracking
mobile users in personal communication systems. Many approaches have been proposed to improve both the location update traffic
and searching costs. Some of these approaches can reduce access cost and some other approaches can reduce the location update
cost and location update rate. In this paper, we shall propose a new approach for reducing both location update cost and searching
cost (for finding mobile users location information). The new scheme called Virtual Overlap Region with Forwarding Pointer
(VORFP) uses the forwarding pointer and the virtual overlap region concepts. The virtual overlap region technique is a good
method for reducing the location update traffic, especially when a user backs and forths between adjacent cells. Our performance
evaluations show that VORFP can significantly reduce searching cost and update cost. 相似文献
113.
Dariush Semnani Elham Naghashzargar Mehdi Hadjianfar Fahimeh Dehghan Manshadi Sajjad Mohammadi Saeed Karbasi 《国际聚合物材料杂志》2017,66(3):149-157
In this investigation, a nanofibrous scaffold was fabricated through electrospinning of polycaprolactone (PCL) and chitosan (CS) using a novel collector to make better orientation and pore size for cell infiltration. PCL/CS nanofibers with 90-rpm collector speed and 40° angle between collector wires of the new collector have fewer diameters with better pore, size and nanofibers orientation. Mechanical properties, roughness parameters, topology, structure, hydrophilicity, and cell growing were considered for liver tissue engineering. The cell culture was done using epithelial liver mouse cells. The developed electrospun PCL/CS scaffold using novel collector would be an excellent matrix for biomedical applications especially liver tissue engineering. 相似文献
114.
Improving the electrochemical properties of membranes in lithium-ion batteries (LIBs) is very important. Many attempts have been made to optimize ionic conductivity of membranes. The aim of this study was fabricating composite nanofiber membranes of poly(vinylidene fluoride) (PVDF), containing titanium dioxide (TiO2) and graphene oxide (GO) nanoparticles to use in LIBs as separators. The morphology, crystallinity, porosity, pore size, electrolyte uptake, ionic conductivity, and electrochemical stability of the membranes were investigated using scanning electron microscopy, wide-angle X-ray diffraction, Fourier transform infrared spectroscopy, electrochemical impedance spectroscopy, and linear sweep voltammetry. The electrolyte uptake and ionic conductivity of the PVDF/TiO2/GO composite nanofiber membranes containing 2 wt % GO were 494% and 4.87 mS cm−1, respectively, which were higher than those of the other fabricated membranes as well as the commercial Celgard membrane. This could be attributed to the increased porosity, larger surface area, and higher amorphous regions of the PVDF/TiO2/GO composite nanofiber membranes as a result of the synergistic effects of the nanoparticles. In this work, suitable optimized membranes with greater electrochemical stability compared with the other membranes were presented. Also, it was demonstrated that the incorporation of the TiO2 and GO nanoparticles into the PVDF nanofiber membranes led to a porous structure where the electrolyte uptake enhanced. These properties made these membranes promising candidates for being used as separators in LIBs. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48775. 相似文献