目的通过测量睫状肌调节性微波动高频成分(high frequency component,HFC)来分析有晶状体眼人工晶状体(phakic intraocular lens,P-IOL)植入对高度近视患者睫状肌收缩能力及调节力的影响。方法收集2004年12月~2006年3月在我院进行虹膜...目的通过测量睫状肌调节性微波动高频成分(high frequency component,HFC)来分析有晶状体眼人工晶状体(phakic intraocular lens,P-IOL)植入对高度近视患者睫状肌收缩能力及调节力的影响。方法收集2004年12月~2006年3月在我院进行虹膜固定型有晶状体眼人工晶状体Verisyse植入的患者54例(54眼)。采用NIDEK ARK-730A红外验光仪中调节性微波动分析软件,分别在术后1周、3个月对该54例患者(54眼)进行睫状肌调节性微波动高频成分检查。并与患者术后调节力进行相关性分析。结果HFC与Verisys植入术后1周及3个月的调节力均正相关(术后1周r=0.628,P<0.01;术后3个月r=0.835,P<0.01);Verisyse植入术后3个月的HFC及调节力均较术后1周的HFC及调节力有明显提高。结论高度近视患者有晶状体眼人工晶状体植入有利于术后睫状肌收缩能力及调节力的提高。展开更多
Geopotential, dynamic, orthometric and normal height systems and the corrections related to these systems are evaluated in this paper. Along two different routes, with a length of about 5 kilometers, precise leveling ...Geopotential, dynamic, orthometric and normal height systems and the corrections related to these systems are evaluated in this paper. Along two different routes, with a length of about 5 kilometers, precise leveling and gravity measurements are done. One of the routes is in an even field while the other is in a rough field. The magnitudes of orthometric, normal and dynamic corrections are calculated for each route. Orthometric, dynamic, and normal height differences are acquired by adding the corrections to the height differences obtained from geometric leveling. The magnitudes of the corrections between the two routes are compared. In addition, by subtracting orthometric, dynamic, and normal heights from geometric leveling, deviations of these heights from geometric leveling are counted.展开更多
Objective To observe the changes on multifocal electroretinography (MfERG) in the fellow eyes of patients with high myopia without fundus lesions and rhegmatogenous retinal detachment (RRD). Methods MfERG was perf...Objective To observe the changes on multifocal electroretinography (MfERG) in the fellow eyes of patients with high myopia without fundus lesions and rhegmatogenous retinal detachment (RRD). Methods MfERG was performed in 66 patients ( 66 eyes) which were grouped into : emmetropes ( n = 22 ) as the control eye ; high myopes without fundus lesions ( corrected visual acuity ≥ 1. 0, n = 15 ) ; and fellow eyes of high myopics with RRD (n = 29 ). The first-order kernels N1, P1, N2 response density and latency were analyzed. Results When compared with the emmetropes group, the high myopes group had significantly reduced N1 , PI , and N2 wave response densities in rings 1 to 6 ( P 〈 0. 05 ), delayed N1 wave latency in rings 3 to 6, and P1 wave latency in rings 3 to 5 ( P 〈 0. 05 ). The fellow eyes group had significantly reduced N1, P1, and N2 wave response densities in rings 1 to 6 and significantly delayed N1 and P1 wave latencies in rings 3 to 6 ( P 〈0. 05) compared with the emmetropes group. Compared with the high myopes group, P1 wave response densities in rings 1 to 6, N1 wave response densities in rings 1,3, 4, and 6, and N2 wave response density in ring 1 were significantly decreased in the fellow eyes group ( P 〈 0. 05 ) ; whereas there were no significant differences in latencies between the two groups (P 〉0.05). Conclusion MfERG can sensitively assess the early changes in visual function in fellow eyes in patients with RRD.展开更多
This study analyzed the performance of university development which deviated from the scientific outlook on development, then elaborated four dimensions of sustainable development in universities including the cultura...This study analyzed the performance of university development which deviated from the scientific outlook on development, then elaborated four dimensions of sustainable development in universities including the cultural perspective dimension of people-oriented, the qualitative perspective dimension of personnel training, the innovative perspective dimension of academic research, and the strategic perspective dimension of scientific development. Finally, this article analyzed the scientific development approaches on coordinating the university extensive expansion and content development, special development and overall development, teaching and research as well as interests of current and long-term development were proposed.展开更多
High performance concrete originated in the generation of high strength concrete, and it is a new high technology of concrete, is in common with high quality and in concrete. High durability on the perspective of impr...High performance concrete originated in the generation of high strength concrete, and it is a new high technology of concrete, is in common with high quality and in concrete. High durability on the perspective of improvement and become, use a lot of high quality raw materials and modern technology, is the main development direction of concrete. Because its comprehensive performance by the superiority of the focus of the society, the strict construction technology in the extensive application in the highway bridge, high performance can the use of concrete can improve the efficiency of its safety and avoid unnecessary accidents展开更多
The woodpecker does not suffer head/eye impact injuries while drumming on a tree trunk with high acceleration (more than 1000xg) and high frequency. The mechanism that protects the woodpecker's head has aroused the...The woodpecker does not suffer head/eye impact injuries while drumming on a tree trunk with high acceleration (more than 1000xg) and high frequency. The mechanism that protects the woodpecker's head has aroused the interest of ornithologists, biologists and scientists in the areas of mechanical engineering, material science and electronics engineering. This article reviews the literature on the biomechanisms and materials responsible for protecting the woodpecker from head impact injury and their applications in engineering and human protection.展开更多
文摘Geopotential, dynamic, orthometric and normal height systems and the corrections related to these systems are evaluated in this paper. Along two different routes, with a length of about 5 kilometers, precise leveling and gravity measurements are done. One of the routes is in an even field while the other is in a rough field. The magnitudes of orthometric, normal and dynamic corrections are calculated for each route. Orthometric, dynamic, and normal height differences are acquired by adding the corrections to the height differences obtained from geometric leveling. The magnitudes of the corrections between the two routes are compared. In addition, by subtracting orthometric, dynamic, and normal heights from geometric leveling, deviations of these heights from geometric leveling are counted.
文摘Objective To observe the changes on multifocal electroretinography (MfERG) in the fellow eyes of patients with high myopia without fundus lesions and rhegmatogenous retinal detachment (RRD). Methods MfERG was performed in 66 patients ( 66 eyes) which were grouped into : emmetropes ( n = 22 ) as the control eye ; high myopes without fundus lesions ( corrected visual acuity ≥ 1. 0, n = 15 ) ; and fellow eyes of high myopics with RRD (n = 29 ). The first-order kernels N1, P1, N2 response density and latency were analyzed. Results When compared with the emmetropes group, the high myopes group had significantly reduced N1 , PI , and N2 wave response densities in rings 1 to 6 ( P 〈 0. 05 ), delayed N1 wave latency in rings 3 to 6, and P1 wave latency in rings 3 to 5 ( P 〈 0. 05 ). The fellow eyes group had significantly reduced N1, P1, and N2 wave response densities in rings 1 to 6 and significantly delayed N1 and P1 wave latencies in rings 3 to 6 ( P 〈0. 05) compared with the emmetropes group. Compared with the high myopes group, P1 wave response densities in rings 1 to 6, N1 wave response densities in rings 1,3, 4, and 6, and N2 wave response density in ring 1 were significantly decreased in the fellow eyes group ( P 〈 0. 05 ) ; whereas there were no significant differences in latencies between the two groups (P 〉0.05). Conclusion MfERG can sensitively assess the early changes in visual function in fellow eyes in patients with RRD.
基金Fund Project: the National Natural Science Foundation of China (No: 70673075) the National Social Science Foundation of China (No.: 07BJV035)+1 种基金 the Nation Education & Science 11th Five-Year Plan--Ministry of Education, youth issues (No.: EFA090413) the Hubei Province Science & Technology Department, special issues of soft science (No.: 2009DEA049).
文摘This study analyzed the performance of university development which deviated from the scientific outlook on development, then elaborated four dimensions of sustainable development in universities including the cultural perspective dimension of people-oriented, the qualitative perspective dimension of personnel training, the innovative perspective dimension of academic research, and the strategic perspective dimension of scientific development. Finally, this article analyzed the scientific development approaches on coordinating the university extensive expansion and content development, special development and overall development, teaching and research as well as interests of current and long-term development were proposed.
文摘High performance concrete originated in the generation of high strength concrete, and it is a new high technology of concrete, is in common with high quality and in concrete. High durability on the perspective of improvement and become, use a lot of high quality raw materials and modern technology, is the main development direction of concrete. Because its comprehensive performance by the superiority of the focus of the society, the strict construction technology in the extensive application in the highway bridge, high performance can the use of concrete can improve the efficiency of its safety and avoid unnecessary accidents
基金supported by the National Natural Science Foundation of China (10925208,11120101001,11202017,11272038)Beijing Natural Science Foundation (7133245)+1 种基金Young Scholars for the Doctoral Program of Ministry of Education of China (20121102120039)the Hong Kong Polytechnic University (G-U624)
文摘The woodpecker does not suffer head/eye impact injuries while drumming on a tree trunk with high acceleration (more than 1000xg) and high frequency. The mechanism that protects the woodpecker's head has aroused the interest of ornithologists, biologists and scientists in the areas of mechanical engineering, material science and electronics engineering. This article reviews the literature on the biomechanisms and materials responsible for protecting the woodpecker from head impact injury and their applications in engineering and human protection.