摘要 :
Purpose: To investigate the difference of stereometric parameters of optic nerve head between the normal subjects and patients with big-cupped disk and primary open angle glaucoma(POAG).Methods: Twenty-two cases (44 eyes) of norma...
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Purpose: To investigate the difference of stereometric parameters of optic nerve head between the normal subjects and patients with big-cupped disk and primary open angle glaucoma(POAG).Methods: Twenty-two cases (44 eyes) of normal subjects, 17 cases (34 eyes) of patients with big-cupped disk and 19 cases (37 eyes) of patients with POAG underwent Heidelberg Retina Tomograph (HRT) examination to get topography images and stereometric parameters of optic nerve head.Results: The stereometric parameters of optic nerve head of the normal, patients with big-cupped disk and POAG were 1) disk area (mm2): 1.995±0.501, 2.407±0.661and 2. 248±0.498;2) cup area (mm2): 0. 573 ±0. 264, 1. 095±0.673 and 1.340±0.516; 3) cup/disk ratio: 0. 257±0.095, 0. 428±0.176 and 0. 589 ±0. 195; 4) rim area (mm2): 1.461±0.328, 1.312±0.418 and 0.905±0.409; 5)cup volume (mm3):0.108±0.073, 0.347±0.346 and 0.550±0.394; 6) rim volume (mm3): 0.421±0.111, 0.378±0.225 and 0.224±0.189;7) mean cup depth (mm): 0.225±0.070,0.327±0.105 and 0.424±0.148; 8) maxim cup depth(mm): 0.630±0.178,0.732±0.170 and 0.871±0.245; 9) cup shape measure (mm): -0.1867±0.09,-0.108±0.068 and -0.02±0.164; 10) mean RNFL thickness (mm): 0.290±0.053, 0.236 ±0.131 and 0.174 ±0.134; 11) RNFL cross sectional area (mm2):1.419±0.332, 1.263±0.606 and 0.920±0.687. Besides, there was no difference of disk area between big cupped disk group and POAG group, no difference of rim area,rim volume and RNFL thickness between normal group and big cupped disk group,statistics analysis showed that there was significant difference of other stereometric parameters between the normal group and big cupped disk group or big cupped disk group and POAG group.Conclusions: There is certain difference of optic nerve head between the normal subjects and big-cupped disk a nd patients with POAG.
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摘要 :
The application possibilities of organic materials for high density optical disk data storage are discussed.Several points,such as physical and chemical stabilities,wavelength match and reversible property changes,which should be ...
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The application possibilities of organic materials for high density optical disk data storage are discussed.Several points,such as physical and chemical stabilities,wavelength match and reversible property changes,which should be taken into consideration,are presented.
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摘要 :
In this note, by using Sb to replace the Al reflective layer in the conventional optical disk, the recording pits with a diameter 380 nm and a depth 50 nm are read out in the device, whose laser wavelength l is 632.8 nm and numeri...
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In this note, by using Sb to replace the Al reflective layer in the conventional optical disk, the recording pits with a diameter 380 nm and a depth 50 nm are read out in the device, whose laser wavelength l is 632.8 nm and numerical aperture (NA) is 0.40. In the course of reproduction, the readout laser power is 4 mW and the rotation velocity of the disk is 5 m/s. The optimum Sb film thickness is 28-30 nm and the CNR is 38-40 dB.
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摘要 :
In this note, by using Sb to replace the Al reflective layer in the conventional optical disk, the recording pits with a diameter 380 nm and a depth 50 nm are read out in the device, whose laser wavelength λ is 632.8 nm and numer...
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In this note, by using Sb to replace the Al reflective layer in the conventional optical disk, the recording pits with a diameter 380 nm and a depth 50 nm are read out in the device, whose laser wavelength λ is 632.8 nm and numerical aperture (NA) is 0.40. In the course of reproduction, the readout laser power is 4 mW and the rotation velocity of the disk is 5m/s. The optimum Sb film thickness is 28-30 nm and the CNR is 38-40 dB.
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摘要 :
The key for the development of high -density optical storage technology nowadays is to develop short wavelength (blue-green laser) recording media and devices. Based on the progress achieved in the key program of National Natural ...
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The key for the development of high -density optical storage technology nowadays is to develop short wavelength (blue-green laser) recording media and devices. Based on the progress achieved in the key program of National Natural Science Foundation of China "high-density optical storage materials using blue -green laser recording", the chemical composition, microstructure, storage performance and related mechanisms of some kinds of novel high density optical storage materials are presented in this paper. The research method and clew for super high -density optical storage materials and technologies are highlighted.
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