AIM：To investigate the association between tear film break up time（TBUT）and blinking interval in visual display terminal（VDT）users.METHODS：Nine hundred and thirty VDT users underwent dry eye testing,and function...AIM：To investigate the association between tear film break up time（TBUT）and blinking interval in visual display terminal（VDT）users.METHODS：Nine hundred and thirty VDT users underwent dry eye testing,and functional visual acuity（FVA）test.The blinking interval during FVA was compared with TBUT.Subjects with longer blinking interval than TBUT were considered as unstable tear film.Logistic regression analysis revealed the risk factors for unstable tear group.RESULTS：Among 930 workers,858 subjects（92.3%）participated in this study.Almost 80% of the subjects were categorized into the unstable tear group.Unstable tear group has significantly lower Schirmer values and TBUT（17.5±11.6 vs 21.1±11.5 mm,3.7±2.6 vs 5.7±2.7s,both P〈0.001）.There were no significant differences in epithelial staining or severity of symptoms.Logistic regression showed that over 40y was a risk for being unstable tear group[odds ratio（OR）=1.53;95%confidence interval（CI）=1.06-2.20].Contact lens use was protective factor for being in the unstable tear group（OR=0.37;95%CI=0.26-0.53）.CONCLUSION：Subjects with shorter TBUT than blinking interval are prevalent among VDT users.Subjects over the age of 40 shows an increased risk for unstable tear film.展开更多
Teachers have been paying more attention to oral English teaching in junior high school than ever before. Generally, teachers focus on teaching oral English in class, where they give preeminence to creating an environ...Teachers have been paying more attention to oral English teaching in junior high school than ever before. Generally, teachers focus on teaching oral English in class, where they give preeminence to creating an environment in the classroom which approximates to the"real-life"communicative use of language (Yang Chaochun & Cheng Lian 2005). However, there are some limits teaching oral English in class. This essay puts forwards to provide input during the break time for students to acquire oral English unconsciously in junior high school to make up for the insufficiency.展开更多
The space-time evolution of a given density perturbation in cold homogeneous electron- positron-ion plasma is investigated with an assumption of infinitely massive ions by employing a numerical calculation method. The...The space-time evolution of a given density perturbation in cold homogeneous electron- positron-ion plasma is investigated with an assumption of infinitely massive ions by employing a numerical calculation method. The phase-mixing time and wave-breaking time can be effectively distinguished with this method. It is found that an increase of the ratio of equilibrium ion density to equilibrium electron density can attenuate plasma oscillations, leading to a delay in wave breaking. The dependence of the phase-mixing and wave-breaking times on the amplitude of the initial perturbation is also discussed.展开更多
Somewhat similar to, but quite different from the xenon-135 poisoning effects resulted from fission produced iodine-135 via β-decay during restart-up process of a fission reactor, a complete new concept of ＂tritium ...Somewhat similar to, but quite different from the xenon-135 poisoning effects resulted from fission produced iodine-135 via β-decay during restart-up process of a fission reactor, a complete new concept of ＂tritium well depth and tritium well time＂ is first time introduced in fusion research area by authors. It shows the least required amount of tritium storage is to start up a fusion reactor ,and the least operating time for achieving the ＂tritium break even＂ during the initial start-up phase due to the finite tritium breeding time. The tritium well depth and tritium well time depend on the tritium recovery scheme and extraction process, the tritium retention of reactor components,展开更多
As an example of our new approach to complex near-field （NF） scattering of electromagnetic waves, the timereversal （TR） transmission process on an NF current-element array is mapped to the statistical process on a...As an example of our new approach to complex near-field （NF） scattering of electromagnetic waves, the timereversal （TR） transmission process on an NF current-element array is mapped to the statistical process on a kinetic Ising transmission chain. Equilibrium statistical mechanics and non-equilibrium Monte Carlo （MC） dynamics help us to find signal jamming, aging, annihilating, creating, and TR symmetry breaking on the chain with inevitable background noises; and these results are general in NF systems where complex electromagnetic scattering arises.展开更多
目的:分析翼状胬肉切除术后复发的危险因素及对角膜散光度及泪膜破裂时间的影响。方法:回顾性研究。选取2020-01/2023-01我院收治的翼状胬肉患者110例110眼,其中原发性翼状胬肉77例77眼,复发性翼状胬肉33例33眼。所有患者均行翼状胬肉...目的:分析翼状胬肉切除术后复发的危险因素及对角膜散光度及泪膜破裂时间的影响。方法:回顾性研究。选取2020-01/2023-01我院收治的翼状胬肉患者110例110眼,其中原发性翼状胬肉77例77眼,复发性翼状胬肉33例33眼。所有患者均行翼状胬肉切除术。检测翼状胬肉患者手术前后角膜散光度及泪膜破裂时间,统计术后复发情况并分析术后翼状胬肉复发的危险因素。结果:本研究110眼翼状胬肉切除术后复发8眼,复发率为7.3%。所有患者手术前后角膜散光度比较无差异(2.02±0.32 vs 2.00±0.32 D,P>0.05),泪膜破裂时间比较有差异(9.55±1.24 vs 13.46±2.56 s,P<0.05)。多因素Logistics回归分析结果显示年龄、工作环境、糖尿病、胬肉性质、术后泪膜破裂时间、手术方式为影响翼状胬肉切除术后复发的因素(均P<0.05)。结论:翼状胬肉切除术后患者泪膜破裂时间延长,年龄、工作环境、糖尿病、胬肉性质、术后泪膜破裂时间、手术方式均为翼状胬肉术后复发的危险因素。展开更多
文摘AIM：To investigate the association between tear film break up time（TBUT）and blinking interval in visual display terminal（VDT）users.METHODS：Nine hundred and thirty VDT users underwent dry eye testing,and functional visual acuity（FVA）test.The blinking interval during FVA was compared with TBUT.Subjects with longer blinking interval than TBUT were considered as unstable tear film.Logistic regression analysis revealed the risk factors for unstable tear group.RESULTS：Among 930 workers,858 subjects（92.3%）participated in this study.Almost 80% of the subjects were categorized into the unstable tear group.Unstable tear group has significantly lower Schirmer values and TBUT（17.5±11.6 vs 21.1±11.5 mm,3.7±2.6 vs 5.7±2.7s,both P〈0.001）.There were no significant differences in epithelial staining or severity of symptoms.Logistic regression showed that over 40y was a risk for being unstable tear group[odds ratio（OR）=1.53;95%confidence interval（CI）=1.06-2.20].Contact lens use was protective factor for being in the unstable tear group（OR=0.37;95%CI=0.26-0.53）.CONCLUSION：Subjects with shorter TBUT than blinking interval are prevalent among VDT users.Subjects over the age of 40 shows an increased risk for unstable tear film.
文摘Teachers have been paying more attention to oral English teaching in junior high school than ever before. Generally, teachers focus on teaching oral English in class, where they give preeminence to creating an environment in the classroom which approximates to the"real-life"communicative use of language (Yang Chaochun & Cheng Lian 2005). However, there are some limits teaching oral English in class. This essay puts forwards to provide input during the break time for students to acquire oral English unconsciously in junior high school to make up for the insufficiency.
基金supported by National Natural Science Foundation of China (Nos. 11665012 and 11247016)the Natural Science Foundation of Jiangxi Province, China (Nos. 2014ZBAB202001 and 2015ZBAB202006)
文摘The space-time evolution of a given density perturbation in cold homogeneous electron- positron-ion plasma is investigated with an assumption of infinitely massive ions by employing a numerical calculation method. The phase-mixing time and wave-breaking time can be effectively distinguished with this method. It is found that an increase of the ratio of equilibrium ion density to equilibrium electron density can attenuate plasma oscillations, leading to a delay in wave breaking. The dependence of the phase-mixing and wave-breaking times on the amplitude of the initial perturbation is also discussed.
文摘Somewhat similar to, but quite different from the xenon-135 poisoning effects resulted from fission produced iodine-135 via β-decay during restart-up process of a fission reactor, a complete new concept of ＂tritium well depth and tritium well time＂ is first time introduced in fusion research area by authors. It shows the least required amount of tritium storage is to start up a fusion reactor ,and the least operating time for achieving the ＂tritium break even＂ during the initial start-up phase due to the finite tritium breeding time. The tritium well depth and tritium well time depend on the tritium recovery scheme and extraction process, the tritium retention of reactor components,
基金supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No.20100185110021)the National Natural Science Foundation of China (Grant No.61071031)
文摘As an example of our new approach to complex near-field （NF） scattering of electromagnetic waves, the timereversal （TR） transmission process on an NF current-element array is mapped to the statistical process on a kinetic Ising transmission chain. Equilibrium statistical mechanics and non-equilibrium Monte Carlo （MC） dynamics help us to find signal jamming, aging, annihilating, creating, and TR symmetry breaking on the chain with inevitable background noises; and these results are general in NF systems where complex electromagnetic scattering arises.
文摘目的:分析翼状胬肉切除术后复发的危险因素及对角膜散光度及泪膜破裂时间的影响。方法:回顾性研究。选取2020-01/2023-01我院收治的翼状胬肉患者110例110眼,其中原发性翼状胬肉77例77眼,复发性翼状胬肉33例33眼。所有患者均行翼状胬肉切除术。检测翼状胬肉患者手术前后角膜散光度及泪膜破裂时间,统计术后复发情况并分析术后翼状胬肉复发的危险因素。结果:本研究110眼翼状胬肉切除术后复发8眼,复发率为7.3%。所有患者手术前后角膜散光度比较无差异(2.02±0.32 vs 2.00±0.32 D,P>0.05),泪膜破裂时间比较有差异(9.55±1.24 vs 13.46±2.56 s,P<0.05)。多因素Logistics回归分析结果显示年龄、工作环境、糖尿病、胬肉性质、术后泪膜破裂时间、手术方式为影响翼状胬肉切除术后复发的因素(均P<0.05)。结论:翼状胬肉切除术后患者泪膜破裂时间延长,年龄、工作环境、糖尿病、胬肉性质、术后泪膜破裂时间、手术方式均为翼状胬肉术后复发的危险因素。
