排序方式: 共有174条查询结果,搜索用时 234 毫秒
41.
Dragana Krstic Zoran Jovanovic Vladimir Markovic Dragoslav Nikezic Vlade Urosevic 《Central European Journal of Physics》2014,12(10):714-718
The Boron Neutron Capture Therapy (BNCT) is based on selective uptake of boron in tumour tissue compared to the surrounding normal tissue. Infusion of compounds with boron is followed by irradiation with neutrons. Neutron capture on 10B, which gives rise to an alpha particle and recoiled 7Li ion, enables the therapeutic dose to be delivered to tumour tissue while healthy tissue can be spared. Here, therapeutic abilities of BNCT were studied for possible treatment of liver cancer using thermal and epithermal neutron beam. For neutron transport MCNP software was used and doses in organs of interest in ORNL phantom were evaluated. Phantom organs were filled with voxels in order to obtain depth-dose distributions in them. The result suggests that BNCT using an epithermal neutron beam could be applied for liver cancer treatment. 相似文献
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Reverse order laws in C-algebras 总被引:1,自引:0,他引:1
In this paper, we offer purely algebraic necessary and sufficient conditions for reverse order laws for generalized inverses in C∗-algebras, extending rank conditions for matrices and range conditions for Hilbert space operators. 相似文献
45.
Dragana S. Cvetkovi?-Ili? 《Applied mathematics and computation》2011,218(7):3019-3024
In this paper, the Drazin inverse of certain sums and block triangular matrices are presented. 相似文献
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In this paper, we offer new necessary and sufficient conditions for the reverse order laws to hold for the weighted generalized inverses of matrices. 相似文献
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In this paper, we give some necessary and sufficient conditions for the existence of Re-nnd and nonnegative definite {1,3}- and {1,4}-inverses of a matrix A∈Cn×n and completely described these sets. Moreover, we prove that the existence of nonnegative definite {1,3}-inverse of a matrix A is equivalent with the existence of its nonnegative definite {1,2,3}-inverse and present the necessary and sufficient conditions for the existence of Re-nnd {1,3,4}-inverse of A. 相似文献
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The main objective of this article is to study several generalizations of the reverse order law for the Moore–Penrose inverse in ring with involution. 相似文献
49.
Lidija Gomidželović Dragana Živković Ana Kostov Aleksandra Mitovski Ljubiša Balanović 《Journal of Thermal Analysis and Calorimetry》2011,103(3):1105-1109
The results of comparative thermodynamic analysis of Ga–In–Sb system are presented in this paper. Investigations, carried
out in the section from Ga corner with molar ratio of In:Sb equal to 1:1, were done experimentally, using Oelsen calorimetry
at the temperature 873 K and analytically, applying different calculation methods—Toop and Muggianu, in the temperature interval
from 873 to 1673 K. Excess molar Gibbs energies and activity of all components in specified temperature interval were calculated. 相似文献
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Dragana . Dabi Zagorac Milica M. Fotiri Aki Vesna Glavnik Uro M. Gai Irena Vovk
ivoslav Lj. Tei Maja M. Nati 《Journal of separation science》2020,43(8):1431-1439
The profile of flavan‐3‐ols and proanthocyanidins in five different Rosa species (R. canina, R. glutinosa, R. rubiginosa, R. multiflora, and R. spinosissima) was estimated on high performance thin layer chromatography cellulose plates. Differences in flavanol and proanthocyanidin profiles of the extracts were evident, among which Rosa spinosissima stood out with catechin as the only detected flavanol and red zones as indication of anthocyanins. Furthermore, the elution solvent for thin layer chromatography with mass spectrometry analyses of glycosylated flavan‐3‐ols and proanthocyanidins was optimized, enabling identification of catechin, (epi)catechin hexoside, proanthocyanidin dimer, and proanthocyanidin dimers and trimers hexosides. A total of 15 flavanols and their derivatives were identified using ultra‐high‐performance liquid chromatography with linear trap quadrupole‐Orbitrap mass analyzer and epicatechin, gallocatechin, and proanthocyanidin trimer were identified only using this technique. However, proanthocyanidin trimer trihexoside was identified only by thin‐layer chromatography with mass spectrometry. To establish the relationships between the flavanols and proanthocyanidins composition of rose hip and their origin, principal component analysis was performed on the entire set of liquid chromatography/mass spectrometry data. Both principal components’ scores plots showed that Rosa spinosissima could be considered as an outlier. Our study demonstrated that flavanol and proanthocyanidin profiles of different rose hips depend on the geographical origin rather than on the cultivar and genotype. 相似文献