金刚石合成用触媒粉氧氮含量的研究,无论对于功能性金刚石的开发还是磨料级金刚石的生产和应用都具有重要意义。文章使用LECO ONH836分析仪对金刚石合成用触媒粉中的氧(红外吸收法)、氮(热导法)含量进行测量,采用GUM法(Guide to the Unc...金刚石合成用触媒粉氧氮含量的研究,无论对于功能性金刚石的开发还是磨料级金刚石的生产和应用都具有重要意义。文章使用LECO ONH836分析仪对金刚石合成用触媒粉中的氧(红外吸收法)、氮(热导法)含量进行测量,采用GUM法(Guide to the Uncertainty in Measurement)对检测结果进行不确定度的评定。结果表明:在K=2,包含概率p=95%的情况下,氧含量的扩展不确定度为0.01%,氮含量的扩展不确定度为0.000 3%。测量不确定度的最主要来源为标样值的不确定度。评定结果作为度量金刚石合成用触媒粉中氧氮含量测量结果可信程度的重要依据,既为提高检测准确度提供了可行性指导又为研究工业金刚石性能与氧氮含量之间的内在关联提供了可靠的数据支撑。展开更多
Aims: To describe the progression of Primary open angle glaucoma (POAG) on Optical Coherence Tomography (OCT) of the optic nerve head and retinal nerve fiber layers (RNFL). Method: We conducted a descriptive retrospec...Aims: To describe the progression of Primary open angle glaucoma (POAG) on Optical Coherence Tomography (OCT) of the optic nerve head and retinal nerve fiber layers (RNFL). Method: We conducted a descriptive retrospective study from January 1, 2015 to December 31, 2019, a period of 5 years from the files of patients followed for POAG and having carried out at least two OCT examinations of the optic nerve head (ONH), one automated visual field and Intraocular pression (IOP). The variables studied were: age, sex, mean IOP, glaucoma stage, progression of ONH parameters, and progression of RNFL parameters. Results: During the period, 112 eyes of 56 patients were included. The mean age was 48.96 ± 16.57 [12 - 83] years with a sex-ratio of 1.33 (32 M/27 F). The mean IOP was 21 ± 4.54 [10 - 36] mm Hg. According to the mean deviation (MD) of the visual field, 98 eyes or 87.5% were stage 1 of POAG, 10 eyes or 8.9% at stage 2 and 4 eyes or 3.6% at stage 3. The mean time between the 1st and 2nd OCT examination was 28.91 ± 11.07 [6 - 56] months, corresponding to an average of 2.18 OCT per patient in 5 years of follow-up. There was an average increase of 6.2% of the Cup area and an increase in the vertical Cup/Disc ratio of 1.79% per year. The thinning average of neuro-retinal ring area was 1.64% per year. The RNFL thickness had decreased on average by 4.28 μ or 0.93% per year. The lower quadrant had the highest fiber loss with 1.08% per year followed by the upper quadrant with a loss of 1.05% per year. Conclusion: OCT of the ONH and RNFL proves to be an essential tool in the follow-up of POAG. A subsequent study taking into account the OCT of the macular ganglion complex will enable to study its contribution in the follow-up of glaucomatous patients in the same population.展开更多
文摘金刚石合成用触媒粉氧氮含量的研究,无论对于功能性金刚石的开发还是磨料级金刚石的生产和应用都具有重要意义。文章使用LECO ONH836分析仪对金刚石合成用触媒粉中的氧(红外吸收法)、氮(热导法)含量进行测量,采用GUM法(Guide to the Uncertainty in Measurement)对检测结果进行不确定度的评定。结果表明:在K=2,包含概率p=95%的情况下,氧含量的扩展不确定度为0.01%,氮含量的扩展不确定度为0.000 3%。测量不确定度的最主要来源为标样值的不确定度。评定结果作为度量金刚石合成用触媒粉中氧氮含量测量结果可信程度的重要依据,既为提高检测准确度提供了可行性指导又为研究工业金刚石性能与氧氮含量之间的内在关联提供了可靠的数据支撑。
文摘Aims: To describe the progression of Primary open angle glaucoma (POAG) on Optical Coherence Tomography (OCT) of the optic nerve head and retinal nerve fiber layers (RNFL). Method: We conducted a descriptive retrospective study from January 1, 2015 to December 31, 2019, a period of 5 years from the files of patients followed for POAG and having carried out at least two OCT examinations of the optic nerve head (ONH), one automated visual field and Intraocular pression (IOP). The variables studied were: age, sex, mean IOP, glaucoma stage, progression of ONH parameters, and progression of RNFL parameters. Results: During the period, 112 eyes of 56 patients were included. The mean age was 48.96 ± 16.57 [12 - 83] years with a sex-ratio of 1.33 (32 M/27 F). The mean IOP was 21 ± 4.54 [10 - 36] mm Hg. According to the mean deviation (MD) of the visual field, 98 eyes or 87.5% were stage 1 of POAG, 10 eyes or 8.9% at stage 2 and 4 eyes or 3.6% at stage 3. The mean time between the 1st and 2nd OCT examination was 28.91 ± 11.07 [6 - 56] months, corresponding to an average of 2.18 OCT per patient in 5 years of follow-up. There was an average increase of 6.2% of the Cup area and an increase in the vertical Cup/Disc ratio of 1.79% per year. The thinning average of neuro-retinal ring area was 1.64% per year. The RNFL thickness had decreased on average by 4.28 μ or 0.93% per year. The lower quadrant had the highest fiber loss with 1.08% per year followed by the upper quadrant with a loss of 1.05% per year. Conclusion: OCT of the ONH and RNFL proves to be an essential tool in the follow-up of POAG. A subsequent study taking into account the OCT of the macular ganglion complex will enable to study its contribution in the follow-up of glaucomatous patients in the same population.
