22 results on '"M. Sakhaee"'
Search Results
2. Nuclear fission problem and Langevin equation
- Author
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M Sakhaee and S Jahanfar
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fission ,Langevin equation ,chaos-weighted wall friction ,wall friction ,Physics ,QC1-999 - Abstract
A combined dynamical and statistical model for fission was employed in our calculation. There is no doubt that a Langevin description plus a Monte Carlo treatment of the evaporation processes provide the most adequate dynamical description. In this paper, we would consider a strongly shaped dependent friction force and we use the numerical method rather than the analytical one. The objective of this article is to calculate the time dependent fission widths of the 224Th nucleus. The fission widths were calculated with both chaos-weighted wall friction (CWWF) and wall friction (WF) dissipations. The calculations are repeated for 100000 trajectories. The result was compared to the others' work. We use nuclear elongation coordinate with time and it is necessary to repeat the small steps many times to improve the accuracy.
- Published
- 2011
3. Estimation of eye absorbed doses in head & neck radiotherapy practices using thermoluminescent detectors
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Gh Bagheri, M Sakhaee, and M Vahabi-Moghaddam
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patient exposures ,radiotherapy doses ,scattered radiation ,TLD ,cataract ,Physics ,QC1-999 - Abstract
Determination of eye absorbed dose during head & neck radiotherapy is essential to estimate the risk of cataract. Dose measurements were made in 20 head & neck cancer patients undergoing 60Co radiotherapy using LiF(MCP) thermoluminescent dosimeters. Head & neck cancer radiotherapy was delivered by fields using SAD & SSD techniques. For each patient, 3 TLD chips were placed on each eye. Head & neck dose was about 700-6000 cGy in 8-28 equal fractions. The range of eye dose is estimated to be (3.49-639.1 mGy) with a mean of maximum dose (98.114 mGy), which is about 3 % of head & neck dose. Maximum eye dose was observed for distsnces of about 3 cm from edge of the field to eye.
- Published
- 2011
4. The study of allelopathic effect of Eucalyptus camaldulensis on germination and seedling growth of wheat (Triticum aestivum L.)
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A Shariat,, M Sakhaee, M Asareh, and Gh.R BakhshiKhaniki
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eucalyptus ,porolin ,allelopathy ,vigour index ,soluble sugar ,Plant culture ,SB1-1110 - Abstract
In this study allelophatic effects of metanolus extract of Eucalyptus camaldulonsis on some morphological and physiological characteristics of wheat (Triticum aestivum L.) were investigated. Six metanolous extract levels (0, 1.5, 3, 6, 9 and 18 g/lit) were used in completely randomized design with 3 replication in growth chamber of research institute of forest and rangelans of Iran. Radicule length, plumule length, vigour index, germination percentage, germination speed, germination index, wet and dry weight of seedling, prolin and soluble sugar in ridicule, and plumule of seedling were estimated. Results showed that for all parameters, allelopathic effects of eucalyptus extraction between treatments were significanted. The increase of extract concentration decreased germination percentage, radicule and plumule length, wet and dry weight and increased prolin and soluble sugar, significantly. Results of negative effects of metanolus extract of Eucalyptus leaves on germination and seedling growth of wheat recommends not usage of this extract for controlling of weeds in wheat farms.
- Published
- 2010
5. Dose calculation of different eye substructures using a realistic eye model when treating ocular tumors with electron therapy
- Author
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E. Rahmani, M. Sakhaee, Atiyeh Ebrahimi-Khankook, and Alireza Vejdani-Noghreiyan
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Electron therapy ,Health, Toxicology and Mutagenesis ,medicine.medical_treatment ,Monte Carlo method ,Brachytherapy ,Electron ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Safety, Risk, Reliability and Quality ,Waste Management and Disposal ,Proton therapy ,Physics ,Renewable Energy, Sustainability and the Environment ,business.industry ,Melanoma ,Public Health, Environmental and Occupational Health ,medicine.disease ,eye diseases ,Radiation therapy ,Nuclear Energy and Engineering ,030220 oncology & carcinogenesis ,Eye melanoma ,sense organs ,Nuclear medicine ,business - Abstract
One of the most frequent types of intraocular melanoma in adults is choroidal uveal melanoma. The most commonly used forms of radiation therapy are ophthalmic plaque brachytherapy and charged particle external radiation therapy. In the absence of adequate facilities for brachytherapy and proton therapy, electron therapy would be an efficient radiation therapy technique for treating eye melanomas. In the present work, the Monte Carlo code MCNPX 2.6.0 was used to calculate the dose distribution to substructures of the eye in electron therapy of three common choroidal tumors. The simulations were performed for 6 electron beams with nominal energies between 5 MeV and 10 MeV and also for 10 incidence angles. To identify suitable treatment plans, the tumor-to-sensitive zone dose ratios were estimated. Moreover, the equivalent doses delivered to healthy substructures of the eye were also calculated. The results indicate that for the treatment of tumors located at the posterior part of the eye, an electron beam with energy of 10 MeV and incident angle of 45° relative to the eye axis provides the best tumor coverage while optimally sparing other eye substructures. In addition, for tumors positioned on the upper and lower parts of the vitreous, electron beams with energy of 10 MeV, an azimuthal angle of 270°, and polar incident angles of 90° and 105°, respectively, lead to appropriate dose delivery.
- Published
- 2016
6. Search for the chiral doublet bands in122Cs
- Author
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L H Zhu, Yong-Nam U, L M Yang, J. Peng, G S Li, S X Wen, S Q Zhang, C Y Gan, S. J. Zhu, Ming Li, X L Che, Y J Chen, R Q Xu, Jie Meng, L. Y. Zhu, M Sakhaee, and X G Wu
- Subjects
Physics ,Nuclear and High Energy Physics ,Spin states ,Mean field theory ,Isotope ,Yrast ,Gamma spectroscopy ,Atomic physics ,Spectroscopy ,Spin (physics) ,Beam energy - Abstract
High spin states in the odd–odd nucleus 122Cs have been studied by in-beam γ-ray spectroscopy with a 107Ag(19F,1p3n) fusion-evaporation reaction at a beam energy of 85 MeV. A previously known πh11/2 ⊗ νh11/2 yrast band was confirmed and its spin I was re-examined. A ΔI = 2 band was identified, which together with another known ΔI = 2 band forms a side band of the πh11/2 ⊗ νh11/2 yrast band. The two observed πh11/2 ⊗ νh11/2 bands are proposed as a pair of chiral doublet bands in 122Cs based on a systematic comparison with those in the neighbouring odd–odd Cs isotopes, as well as the relativistic mean field and the triaxial particle-rotor-model calculations.
- Published
- 2005
7. IDENTICATION OF NEW LEVELS AND PROPOSED OCTUPOLE CORRELATIONS IN NEUTRON-RICH 150,152Ce
- Author
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Zhigang Xiao, A. V. Daniel, Yu. Ts. Oganessian, Sutao Zhu, Y. X. Luo, A. V. Ramayya, J. H. Hamilton, J. O. Rasmussen, I. Y. Lee, K. Li, G. M. Ter-Akopian, E. H. Wang, S. H. Liu, W. C. Ma, N. T. Brewer, H. J. Li, E. Y. Yeoh, J. K. Hwang, Shou-Wan Chen, J. Y. Guo, and M. Sakhaee
- Subjects
Physics ,Nuclear physics ,Neutron - Published
- 2013
8. Identification of a new side-band and proposed octupole correlations in very neutron-rich152Ce
- Author
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S. H. Liu, M. Sakhaee, Yu. Ts. Oganessian, A. V. Ramayya, W. C. Ma, H. J. Li, A. V. Daniel, E. Y. Yeoh, J. K. Hwang, Y. X. Luo, Zhigang Xiao, Shou-Wan Chen, S. J. Zhu, J. O. Rasmussen, N. T. Brewer, G. M. Ter-Akopian, I. Y. Lee, J. H. Hamilton, Zhenyu Zhang, K. Li, and J. Y. Guo
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Astrophysics::High Energy Astrophysical Phenomena ,Yrast ,Nuclear Theory ,Side band ,Neutron ,Parity (mathematics) ,Electronic band structure ,Spontaneous fission ,Spin-½ - Abstract
High spin levels of the very neutron-rich ${}^{152}$Ce have been investigated by measuring the prompt $\ensuremath{\gamma}$ rays in the spontaneous fission of ${}^{252}$Cf. The yrast band is confirmed and a new side-band has been identified. The side-band is tentatively assigned with negative parity and an octupole band structure with $s=+1$ in ${}^{152}$Ce has been proposed. Based on the theoretical calculations and systematic comparisons, the characteristics of the octupole correlations have been discussed.
- Published
- 2012
9. Observation of new levels and proposed octupole correlations in neutron-rich150Ce
- Author
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S. H. Liu, Y. X. Luo, J. H. Hamilton, A. V. Ramayya, W. C. Ma, E. Y. Yeoh, J. K. Hwang, I. Y. Lee, J. O. Rasmussen, Zhigang Xiao, K. Li, S. J. Zhu, N. T. Brewer, Qiang Xu, M. Sakhaee, and Zhenyu Zhang
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Neutron - Published
- 2012
10. The π h 11/2 Band-Crossing and Possible Octupole Correlations in 122 Ba
- Author
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M. Sakhaee, Wen Shuxian, Gan Cui-Yun, Zhang Zheng, Jiang Zhuo, Zhu Sheng-Jiang, Yang Li-Ming, Zhu Ling-Yan, WU Xiao-Guang, Long Gui-Lu, and XU Rui-Qing
- Subjects
Physics ,Spin states ,Yrast ,Nuclear Theory ,SHELL model ,General Physics and Astronomy ,Band crossing ,Spin-up ,Atomic physics ,Nuclear Experiment ,Rotational frequency - Abstract
High-spin states in 122Ba have been investigated in the 107Ag(19F, 4n) reaction by in-beam γ-ray spectroscopic methods. The ground-state band has been observed with spin up to 20 and a negative-parity band is identified with spin state up to 19. A band-crossing in the yrast band is observed at a rotational frequency of ω≈ 0.36 MeV and, in accordance with cranked shell model calculations, is interpreted as arising from the alignment of two h11/2 protons. Strong E1 transitions between the negative-parity and the yrast bands have been observed, which are proposed as possible evidence for octupole correlations.
- Published
- 2001
11. Collective Bands in Neutron-Rich 104 Mo Nucleus
- Author
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J. K. Hwang, Zhu Sheng-Jiang, Long Gui-Lu, X. Q. Zhang, M. A. Stoyer, A. V. Ramayya, E. F. Jones, A. V. Daniel, Jiang Zhuo, Yang Li-Ming, Gan Cui-Yun, Zhang Zheng, Zhu Ling-Yan, B. R. S. Babu, J. H. Hamilton, Li Ke, G. M. Ter-Akopian, J. D. Cole, J. Komicki, Jon Myong-Gil, R. Aryaeinejad, M. W. Drigert, J. O. Rasmussen, XU Rui-Qing, W. C. Ma, I. Y. Lee, and M. Sakhaee
- Subjects
Physics ,medicine.anatomical_structure ,medicine ,Quasiparticle ,Collective model ,General Physics and Astronomy ,Gammasphere ,Neutron ,Atomic physics ,Detector array ,Moment of inertia ,Nucleus ,Spontaneous fission - Abstract
Levels in the neutron-rich 104Mo nucleus have been investigated by observing prompt γ-rays from the spontaneous fission of 252Cf with the Gammasphere detector array. The ground-state band, the one-phone and the two-phone γ-vibrational bands as well as a quasiparticle band have been confirmed and expanded with spin up to 14. Other two side bands probably built on new quasiparticle states are identified. The possible configurations for the quasiparticle bands are discussed. Two of the quasiparticle bands show larger moments of inertia and may have pair-free characteristics. The levels of the ground-state band, the one-phonon γ-band and the two-phonon γ-band calculated from a general collective model are in close agreement with the experimental data. PACS: 21. 10. Re, 23. 20. Lv, 27. 60. +j, 25. 85. Ca
- Published
- 2000
12. Observation of a Collective Oblate Band in 137 Ce
- Author
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Long Gui-Lu, M. Sakhaee, Zhu Sheng-Jiang, Wen Shuxian, Jiang Zhuo, Yang Li-Ming, Li Ming, Liu Xiangan, Gan Cui-Yun, Zhu Ling-Yan, WU Xiao-Guang, Zhang Zheng, and Myang-Gil Jon
- Subjects
Physics ,Spin states ,Condensed matter physics ,Oblate spheroid ,General Physics and Astronomy ,Spin-up ,Atomic physics ,Spin (physics) - Abstract
High spin states in 137Ce have been studied by using the heavy-ion induced reaction 124Sn(18O, 5n) carried out at China Institute of Atomic Energy. Partial level scheme with spin up to (43/2-), including a high spin collective rotational band observed for the first time, has been established. The collective band shows the properties similar to those oblate bands with ? ~ -60? in neighboring nuclei and probably originates from the five quasi-particle configuration ?s1/2 ? [?h11/2]2 ? ?g7/2 ? ?h11/2. The characteristics of this oblate band have been discussed.
- Published
- 2000
13. Octupole Deformation and Signature Inversion in 145 Ba
- Author
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Yu. Ts. Oganessian, A. V. Ramayya, S G Prussin, San-li Pau, W. C. Ma, I. Y. Lee, J. O. Rasmussen, G. M. Ter-Akopian, R. Aryaeinejad, M. F. Mohar, Gui-Lu Long, Kenneth E. Gregorich, M. A. Stoyer, M. W. Drigert, X. Q. Zhang, J. K. Hwang, J. D. Cole, J. Komicki, S. Y. Chu, B. R. S. Babu, M. Sakhaee, J. H. Hamilton, E. F. Jones, C. Y. Gan, L. Y. Zhu, A. V. Daniel, L. M. Yang, and Shengjiang Zhu
- Subjects
Physics ,Simplex ,Spin states ,Nuclear Theory ,General Physics and Astronomy ,Parity (physics) ,Inversion (meteorology) ,Quantum number ,medicine.anatomical_structure ,medicine ,Atomic physics ,Ground state ,Nucleus ,Spontaneous fission - Abstract
High spin states in neutron-rich odd-N 145Ba nucleus have been investigated from study of prompt γ-rays in spontaneous fission of 252Cf. The alternating parity bands are identified indicating octupole deformation with simplex quantum number s = -i. The ground state band shows signature splitting and inversion at low spin. These collective band structures exhibit the competition and co-existence between symmetric and asymmetric shapes.
- Published
- 1999
14. Identification of Collective Oblate Bands in 138 Ce
- Author
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M. Sakhaee, Ling Yan Zhu, Sheng Jiang Zhu, Jing Kang Deng, L. M. Yang, Shu Xian Wen, San Li Pau, Ming Li, Gui-Lu Long, Cui Yun Gan, Xiang An Liu, and Wu Xiaoguang
- Subjects
Physics ,Spin states ,Oblate spheroid ,Quasiparticle ,General Physics and Astronomy ,Prolate spheroid ,Atomic physics ,Moment of inertia ,Signature (topology) - Abstract
High spin states in 138Ce have been investigated following heavy-ion induced reactions carried out at the China Institute of Atomic Energy, Beijing. Two collective rotational bands were established for the first time. These two bands show oblate deformation with γ = -60° and probably originate from the four quasiparticle configurations πg7/2 ⊗ πh11/2 ⊗ νh11/2 ⊗ νd3/2 and πg7/2 ⊗ πh11/2 ⊗ [νh11/2]2, respectively. These oblate bands exhibit strong M 1 transitions, no signature splitting and different moments of inertia from those of prolate bands.
- Published
- 1999
15. Collective Band Structures in the Neutron-Rich 107,109 Ru Nuclei
- Author
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M. Sakhaee, Ming Li, Gui-Lu Long, F. K. McGowan, I. Y. Lee, Shengjiang Zhu, A. V. Ramayya, M. W. Drigert, S. Y. Chu, S G Prussin, B. R. S. Babu, W. C. Ma, J. H. Hamilton, J. O. Rasmussen, M. F. Mohar, L. M. Yang, M. A. Stoyer, Kenneth E. Gregorich, J. D. Cole, Y K Dardenne, J. Komicki, R. Aryaeinejad, Noah R. Johnson, Jing-kang Deng, C. Y. Gan, and L. Y. Zhu
- Subjects
Nuclear physics ,Physics ,Particle model ,Nuclear Theory ,Quasiparticle ,General Physics and Astronomy ,Neutron ,Parity (physics) ,Atomic physics ,Ground state ,Spontaneous fission - Abstract
The levels in neutron-rich odd-A 107,109Ru nuclei have been investigated by using γ-γ- and γ-γ-γ-coincidence studies of the prompt γ-rays from the spontaneous fission of 252Cf. The ground state bands and the negative parity bands are identified and expanded in both nuclei. Triaxial rotor plus particle model calculations indicate the ground state bands originate from ν(d5/2 + g7/2) quasiparticle configurations and the negative parity bands are from νh11/2 orbital.
- Published
- 1998
16. Search for octupole correlations in neutron-richCe148nucleus
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A. V. Ramayya, I. Y. Lee, Yingtang Chen, H. B. Ding, X. L. Che, Y. X. Luo, M. Sakhaee, Ming Li, S. J. Zhu, J. H. Hamilton, K. Li, J. K. Hwang, and J. O. Rasmussen
- Subjects
Physics ,Nuclear and High Energy Physics ,Simplex ,Neutron ,Gammasphere ,Detector array ,Atomic physics ,Quantum number ,Spontaneous fission - Abstract
New transitions and levels in $^{148}\mathrm{Ce}$ have been observed in a $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidence study from the spontaneous fission of $^{252}\mathrm{Cf}$ with Gammasphere detector array. The ground band has been extended up to ${I}^{\ensuremath{\pi}}={22}^{+}$, and side bands are extended with $\ensuremath{\Delta}I=2$ stretched transitions and $\ensuremath{\Delta}I=1$ crossing transitions. The observed level scheme is interpreted in terms of possible octupole correlations. Two sets of interwined positive- and negative- parity bands with the simplex quantum numbers $s=\ifmmode\pm\else\textpm\fi{}1$ are suggested. The results of $B(E1)/B(E2)$ branching ratios indicate that the octupole correlations in $^{148}\mathrm{Ce}$ are strong.
- Published
- 2006
17. Observation of rotational bands in the neutron-rich107Runucleus
- Author
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Zhenyu Zhang, M. A. Stoyer, M. W. Drigert, S. J. Asztalos, J. D. Cole, Y. X. Luo, A. O. Macchiavelli, J. K. Hwang, P. M. Gore, C. J. Beyer, R. Q. Xu, K. E. Gregorich, G. M. Ter-Akopian, J. Kormicki, Charles M. Folden, A. V. Ramayya, T. N. Ginter, Xuan Zhang, R. V. F. Janssens, John P. Greene, I. Y. Lee, Yu. Ts. Oganessian, J. O. Rasmussen, S. J. Zhu, M. Sakhaee, E. F. Jones, J. H. Hamilton, Z. Jiang, P.M. Zielinski, P. Fallon, L. M. Yang, C. Y. Gan, L. Y. Zhu, W. C. Ma, S. C. Wu, and Iftikhar Ahmad
- Subjects
Physics ,Nuclear reaction ,Nuclear and High Energy Physics ,Excited state ,Neutron ,Gammasphere ,Atomic physics ,Electronic band structure ,Ground state ,Spontaneous fission ,Spin-½ - Abstract
Levels in the neutron-rich, odd-mass ${}^{107}\mathrm{Ru}$ nucleus have been reinvestigated with Gammasphere by measuring high-fold, prompt coincidence events following spontaneous fission of ${}^{252}\mathrm{Cf}.$ The ground state band has been extended up to $\frac{27}{2}\ensuremath{\Elzxh}.$ The structure associated with the ${h}_{11/2}$ excitation has been confirmed and extended to higher spin. The ${h}_{11/2}$ band head has been established to lie at 301.8 keV. These results clear up differences between our earlier work and results from another experiment published recently. A new collective band based on a ${9/2}^{\ensuremath{-}}$ level has been identified for the first time. Some distinct features of the level scheme are discussed.
- Published
- 2001
18. Identification of levels in neutron-rich145Ceand147Cenuclei
- Author
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Xuan Zhang, J. Kormicki, R. W. Lougheed, W. C. Ma, M. F. Mohar, J. K. Hwang, K. J. Moody, J. H. Hamilton, J. K. Deng, E. F. Jones, P. M. Gore, T. N. Ginter, K. Li, B. R. S. Babu, R. Aryaeinejad, I. Y. Lee, G. M. Ter-Akopian, Gui-Lu Long, L. M. Yang, J. F. Wild, S. J. Zhu, Yu. Ts. Oganessian, S. Y. Chu, M. W. Drigert, M. Sakhaee, Stanley G. Prussin, A. V. Daniel, K. E. Gregorich, M. A. Stoyer, C. J. Beyer, A. V. Ramayya, J. O. Rasmussen, C. Y. Gan, L. Y. Zhu, S. J. Asztalos, J. D. Cole, and A. O. Macchiavelli
- Subjects
Physics ,Nuclear and High Energy Physics ,Neutron ,Atomic physics ,Ground state ,Coupling (probability) ,Electronic band structure ,Spontaneous fission - Abstract
High-spin structures in the neutron-rich nuclei ${}^{145}\mathrm{Ce}$ and ${}^{147}\mathrm{Ce}$ produced in the spontaneous fission of ${}^{252}\mathrm{Cf}$ have been investigated by prompt $\ensuremath{\gamma}$-ray spectroscopy. A collective band structure in ${}^{145}\mathrm{Ce}$ is identified. Several sidebands along with the new high-spin states in ${}^{147}\mathrm{Ce}$ are also identified. Particle-plus-rotor model calculations indicate that the yrast bands in ${}^{145}\mathrm{Ce}$ and ${}^{147}\mathrm{Ce}$ most probably originate from coupling of the $\ensuremath{\nu}{i}_{13/2}$ orbital to the ground states of ${}^{144}\mathrm{Ce}$ and ${}^{146}\mathrm{Ce}.$ The ground state configurations of ${}^{145,147}\mathrm{Ce}$ are $(\ensuremath{\nu}{h}_{9/2}+\ensuremath{\nu}{f}_{7/2})$ and $\ensuremath{\nu}{h}_{9/2},$ respectively.
- Published
- 1999
19. Octupole correlations in neutron-rich143,145Baand a type of superdeformed band in145Ba
- Author
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M. Yang, J. Kormicki, S. J. Asztalos, A. V. Ramayya, Meng Wang, J. K. Deng, E. F. Jones, J. D. Cole, J. K. Hwang, Raul Donangelo, M. F. Mohar, G. M. Ter-Akopian, I. Y. Lee, K. J. Moody, R. W. Lougheed, A. O. Macchiavelli, B. R. S. Babu, M. Sakhaee, Stanley G. Prussin, Stoyer, W. C. Ma, Xuan Zhang, S. Y. Chu, N. Ginter, L. K. Peker, G. Drafta, S. Zhu, A. V. Daniel, J. F. Wild, Yu. Ts. Oganessian, Y. Zhu, Henry C. Griffin, P. M. Gore, R. Aryaeinejad, J. H. Hamilton, C. Y. Gan, J. Kliman, C. J. Beyer, K. E. Gregorich, Ming Li, Gui-Lu Long, M. W. Drigert, and J. O. Rasmussen
- Subjects
Physics ,Nuclear and High Energy Physics ,Spin states ,Side band ,Neutron ,Parity (physics) ,Moment of inertia ,Atomic physics ,Kinetic energy ,Neutron density ,Spontaneous fission - Abstract
High spin states in neutron-rich odd-{ital Z} {sup 143,145}Ba nuclei have been investigated from the study of prompt {gamma} rays in the spontaneous fission of {sup 252}Cf by using {gamma}-{gamma}- and {gamma}-{gamma}-{gamma}- coincidence techniques. Alternating parity bands are identified for the first time in {sup 145}Ba and extended in {sup 143}Ba. A new side band, with equal, constant dynamic, and kinetic moments of inertia equal to the rigid body value, as found in superdeformed bands, is discovered in {sup 145}Ba. Enhanced E1 transitions between the negative- and positive-parity bands in these nuclei give evidence for strong octupole deformation in {sup 143}Ba and in {sup 145}Ba. These collective bands show competition and coexistence between symmetric and asymmetric shapes in {sup 145}Ba. Evidence is found for crossing M1 and E1 transitions between the s=+i and s={minus}i doublets in {sup 143}Ba. {copyright} {ital 1999} {ital The American Physical Society}
- Published
- 1999
20. Search for the chiral doublet bands in 122Cs.
- Author
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Yong-Nam U, S J Zhu, M Sakhaee, L M Yang, C Y Gan, L Y Zhu, R Q Xu, X L Che, M L Li, Y J Chen, S X Wen, X G Wu, L H Zhu, G S Li, J Peng, and S Q Zhang and J Meng
- Published
- 2005
21. Anatomical and Visual Effects of the MyoRing Implantation Measured by the ABCD Keratoconus Grading System.
- Author
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Sedaghat MR, Momeni-Moghaddam H, Belin MW, Akbarzadeh R, Sakhaee M, Armanfar F, Shahri F, and Akhavan Rezayat A
- Subjects
- Adult, Cornea surgery, Corneal Pachymetry, Female, Follow-Up Studies, Humans, Keratoconus diagnosis, Male, Prosthesis Design, Retrospective Studies, Severity of Illness Index, Cornea diagnostic imaging, Corneal Topography methods, Keratoconus surgery, Lenses, Intraocular, Ophthalmologic Surgical Procedures methods, Visual Acuity
- Abstract
Objective: To assess the anatomical changes produced by implantation of the complete intracorneal ring (MyoRing; DIOPTEX, GmbH, Linz, Austria) on the different corneal anatomical layers as measured by the ABCD keratoconus staging system 6 months after operation., Methods: Seventeen eyes of 17 keratoconic patients implanted with MyoRing using the femtosecond laser were assessed preoperatively and postoperatively. Distance uncorrected visual acuity and distance corrected visual acuity (DCVA), refraction, and Scheimpflug tomography with Pentacam HR were determined for each patient. The 4 ABCD parameters were recorded, which include the anterior and posterior radius of curvature from a 3.0-mm optical zone centered on the thinnest point (TP) (A & B, respectively), the thinnest corneal thickness (C), and DCVA (D)., Results: Statistically significant improvement (preoperatively vs. postoperatively) in the DCVA (0.40±0.21 vs. 0.67±0.20 in decimal notation, P=0.001) associated with significant flattening effect was observed in both anterior (6.02±0.40 vs. 7.18±0.54 mm, P<0.001) and posterior (4.49±0.41 vs. 4.66±0.40 mm, P=0.001) radius of curvature. There was no significant change in the corneal thickness at the TP (P=0.981). The largest magnitude of change occurred on the anterior surface as measured by the "A" parameter. The average ABCD keratoconus staging before MyoRing implantation was A4B4C2D2 and changed to A1B4C2D1 6 months after ring implantation., Conclusion: Despite the placement of MyoRings in the posterior one-third of the cornea, the greatest changes in curvature occurred on the anterior corneal surface. The ABCD classification and staging system allows for a differential assessment of the different anatomical layers and may prove useful in better understanding of the geometric (structural) and functional changes after MyoRing implantation, as well as with other corneal procedures.
- Published
- 2020
- Full Text
- View/download PDF
22. Bilateral cytomegalovirus retinitis in a healthy infant.
- Author
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Hosseini SM, Moosavi MN, Shoeibi N, Sakhaee M, and Ghavamsaeedi H
- Abstract
Purpose: To report a case of bilateral cytomegalovirus (CMV) retinitis in an otherwise healthy infant., Methods: A four-month-old, healthy, male infant was evaluated for visual inattention., Results: This full-term infant with a normal birth weight and an uneventful gestational period was referred with symptoms of visual inattention, fever, and agitation one week prior to admission. Ocular involvements were detected in the form of bilateral pan uveitis with diffuse bilateral retinitis and vasculitis with hemorrhage in the peripheral retina and posterior pole. CMV DNA was detected in the patient's ocular sample and cerebrospinal fluid by polymerase chain reaction (PCR). He was treated with intravitreal and systemic ganciclovir. Unfortunately, the infant died because of CMV encephalitis. Therefore, bilateral CMV retinitis (CMVR), which was probably transmitted from the mother, was diagnosed in this immunocompetent infant., Conclusions: The present case highlights the possibility of CMVR in immunocompetent infant associated with systemic CMV infection, even during the postnatal period. Therefore, a high index of clinical suspicion and prompt treatment may be life-saving in similar cases.
- Published
- 2016
- Full Text
- View/download PDF
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