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Abstract Energy Dispersive X-ray Diffraction (EDXD) was performed at room temperature to gather structural data on CaS between approximately 1.7 GPa to nearly 150GPa. In these experiments, CaS retained the B1 structure up to approximately 40 GPa above which it began to transform to the B2 structure. The B2 structure remained stable to the highest pressure reached, 149 GPa, where the relative volume V/V0 was 0.490. Previous studies on CaS extended only up to 52 GPa, which is barely 10 GPa after the B1 phase changes to the B2 structure. Thus it was not possible to accurately extrapolate the equation of state (EOS) for the B2 phase region to significantly higher pressures. In the present study EOS data for CaS was collected to 150 GPa and no other structural change was observed. EOS parameters for the B1 and B2 phase regions agree well with values reported in the literature. 相似文献
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In an effort to clarify the role of controlled oxygen exposure in the synthesis of LaBa2Cu3Oy samples which achieve zero resistivity above 90 K, we have prepared samples of La(1+x)Ba(2–x)Cu3Oy with x approximately equal to 0 and with y varying between 6.22 and 7.00. We find that for large values of y, 6.88相似文献
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Peyman Afshani Mahsa Ghandehari Mahya Ghandehari Hamed Hatami Ruzbeh Tusserkani Xuding Zhu 《Journal of Graph Theory》2005,49(4):325-335
This paper proves that if G is a graph (parallel edges allowed) of maximum degree 3, then χ′c(G) ≤ 11/3 provided that G does not contain H1 or H2 as a subgraph, where H1 and H2 are obtained by subdividing one edge of K (the graph with three parallel edges between two vertices) and K4, respectively. As χ′c(H1) = χ′c(H2) = 4, our result implies that there is no graph G with 11/3 < χ′c(G) < 4. It also implies that if G is a 2‐edge connected cubic graph, then χ′c(G) ≤ 11/3. © 2005 Wiley Periodicals, Inc. J Graph Theory 49: 325–335, 2005 相似文献
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Alexander Malugin Heather Herd Hamidreza Ghandehari 《Journal of nanoparticle research》2011,13(10):5381-5396
The objective of this study was to evaluate the influence of size and surface functionality of amorphous silica nanoparticles
(SNPs) on their interaction with cultured cells. The intracellular uptake, phagocytic activity, and possible mechanisms of
toxicity induced by SNPs were studied on murine alveolar macrophages and two epithelial cancer cell lines. It was found that
phagocytic cells are more susceptible to amorphous SNPs than epithelial cells. SNPs with functionalized surfaces were capable
to induce the formation of apoptotic cells to a higher extent than plain particles. Plain SNPs induced plasma membrane damage
in phagocytic cells to a higher extent and caused cell death in a shorter period of time than surface-functionalized SNPs.
The prevalence of necrotic mode of cell death was observed after treatment with plain SNPs. In the range studied surface functionality
played an important role in SNPs toxicity. 相似文献
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This study describes the synthesis, characterization, and in vitro evaluation of N-(2-hydroxypropyl)methacrylamide (HPMA) copolymer-gadolinium (Gd)-doxorubicin (Dox) conjugates. Copolymers of HPMA were derivatized to incorporate side chains for Gd chelation and Dox conjugation. The conjugates were characterized by their side chain contents, T(1) relaxivity (r(1)), stability, and in vitro cytotoxicity. High stability and relaxivity of these conjugates coupled with low toxicity show their potential for monitoring the in vivo fate of HPMA-based drug delivery systems by magnetic resonance imaging techniques. 相似文献
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M. Ghandehari 《数学学报(英文版)》1996,12(1):40-42
AssumeK is a rotor in a regular simplex of heihgt 1 in ann-dimensional Euclidean space. LetK * denote the polar dual ofK. Then the volumeV(K *) satisfies the inequality $$V(K^* ) \geqslant (n + 1)^n \omega _n ,$$ whereω n denotes the volume of ann-dimensional unit ball. Equality holds if and only ifK is a ball centered at the centroid of the simplex. 相似文献