| 1 | Glaucoma surgery and induced astigmatism:a systematic review显示文摘Background:The refractive outcomes of glaucoma surgeries,particularly their effect on astigmatism,are incompletely understood.Main body:Trabeculectomy is associated with a considerable amount of with-the-rule astigmatic change in the immediate postoperative period.This is followed by a gradual against-the-rule shift.These changes are altered with the use of mitomycin C(MMC).Non-penetrating surgery such as deep sclerectomy is also associated with a similar or smaller degree of induced astigmatism.Minimally invasive glaucoma surgery appears to be astigmatically neutral.There is no clear evidence regarding refractive outcomes of glaucoma drainage device surgery.Conclusions:Induced astigmatism may account for a reduction in unaided visual acuity in the early postoperative period following a successful trabeculectomy.These changes appear to stabilise at 3 months,and it would be prudent to defer the prescription of new glasses until this time.If sequential cataract surgery is to be performed,toric intraocular lenses can be a useful option for astigmatic correction. | Helen H.L.Chan Yu Xiang G.Kong | 2017 | Eye and Vision2017，4，1： | 2 |
| 3 | Comparison between electropositive and electronegative cold atmospheric-pressure plasmas:a modelling study显示文摘Cold atmospheric-pressure He +N2 and He +O2 plasmas are chosen as the representatives for electropositive andelectronegative plasmas, of which the discharge characteristics are studied and then compared to each other by fluidmodels. As the increase of the impurity (N2 or O2) fraction from 0 to 10%, for He + N2 plasmas the electron density andion density increase, the spatiotemporal distributions of electron density, ion density, electron temperature and electrongeneration rate change a little. On contrast, for He + O2 plasmas the electron density decreases, the ion density firstincreases and then decreases, the electron temperature increases in the bulk region, but decreases in the sheath region,and the plasmas transform from g mode to α mode as the significant change of electron generation rate distributions.Larger electric field is needed in the bulk region to sustain the electronegative plasma, so the electrical characteristics ofHe + O2 plasmas transform form capacitive to resistive with increasing O2 fraction. Meanwhile, the ion-coupling powerincreases dramatically, which can be estimated by a formula based on the electronegativity. A new criterion fordetermining the sheath boundary, |∇E| = 5 kV/cm2, is put forward, which is found suitable for both the electropositive andelectronegative plasmas. | Ding Xin Liu Jia Feng Li Ai Jun Yang Xiao Hua Wang Ming Zhe Rong Michael G.Kong | 2016 | High Voltage2016，1，2： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员