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Distribution and variability of n-alkanes in waxes of conifers

Journal of Forestry Research 2019年第2期30卷 429-433页

作者： mohamad hassanzadeh-khayyat Maryam Akaberi Hamideh Moalemzadeh Haghighi Amirhossein Sahebkar Seyed Ahmad Emami Pharmaceutical Research Centre Department of Medicinal Chemistry School of Pharmacy Mashhad University of Medical Sciences Student Research Committee Department of Pharmacognosy School of Pharmacy Mashhad University of Medical Sciences Biotechnology Research Center Pharmaceutical Technology Institute Mashhad University of Medical Sciences Neurogenic Inflammation Research Center Mashhad University of Medical Sciences School of Pharmacy Mashhad University of Medical Sciences Department of Pharmacognosy School of PharmacyMashhad University of Medical Sciences

Epicuticular waxes have vital roles in the growth and development of plants and in defense. Conifers have a considerable amount of waxes on their cones and leaves.Here we characterized the n-alkane composition of Iranian conifers, including Juniperus oblonga, J. foetidissima, J.sabina, J. communis subsp. hemisphaerica, J. excelsa,Cupressus sempervirens, Platycladus orientalis from Cupressaceae and Taxus baccata from Taxaceae for the first time using GC-FID analyses. In the waxes, 25 n-alkane homologs with chain lengths ranging from C7 to C32 were identified. Short-chain n-alkanes were dominant in almost all samples with some exceptions. Complementary studies to elucidate complete wax constituents of Iranian conifers and n-alkane distribution pattern as a function of geographical and bioclimatic variables are recommended.

关键词： Gymnosperms Iranian conifers Epicuticular waxes Cupressaceae Taxaceae

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Calculation of dpa rate in graphite box of Tehran Research Reactor(TRR)

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Nuclear Science and Techniques 2019年第6期30卷 44-56页

作者： mohamad Amin Amirkhani Mohsen Asadi Asadabad Mostafa hassanzadeh Seyed Mohammad Mirvakili Ali Mohammadi Reactor and Nuclear Safety Research School Nuclear Science and Technology Research Institute Tehran Iran Department of Physics Arak University Arak Iran

Radiation damage is an important factor that must be considered while designing nuclear facilities and nuclear materials. In this study, radiation damage is investigated in graphite, which is used as a neutron reflector in the Tehran Research Reactor (TRR) core. Radiation damage is shown by displacement per atom (dpa) unit. A cross section of the material was created by using the SPECOMP code. The concentration of impurities present in the non-irradiated graphite was measured by using the ICP-AES method. In the present study the MCNPX code had identified the most sensitive location for radiation damage inside the reactor core. Subsequently, the radiation damage (spectral-averaged dpa values) in the aforementioned location was calculated by using the SPECTER, SRIM Monte Carlo codes, and Norgett, Robinson and Torrens (NRT) model. The results of “Ion Distribution and Quick Calculation of Damage”(QD) method groups had a minor difference with the results of the SPECTER code and NRT model. The maximum radiation damage rate calculated for the graphite present in the TRR core was 1.567 9 10^-8 dpa/s. Finally, hydrogen retention was calculated as a function of the irradiation time.

关键词： Radiation damage Graphite SPECTER SRIM MCNPX Tehran Research Reactor

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