Intraocular pressure (IOP) as measured by Goldmann Applana-tion Tonometry (GAT) is a major risk factor for glaucoma and is commonly used to both screen and classify patients with the disease and to set therapeutic tar...Intraocular pressure (IOP) as measured by Goldmann Applana-tion Tonometry (GAT) is a major risk factor for glaucoma and is commonly used to both screen and classify patients with the disease and to set therapeutic targets and evaluate response to treatment. The accuracy of GAT is known to be affected by Cen-展开更多
Purpose of the study is to investigate the validity of clinical estimates of intra ocular pressure with regard to pachimetry in a prospective hospital based in vivo study on twentyeight patients schedule for routine p...Purpose of the study is to investigate the validity of clinical estimates of intra ocular pressure with regard to pachimetry in a prospective hospital based in vivo study on twentyeight patients schedule for routine phacoemulsification on topical anestesia Intra ocular pressure was measured with Tonopen, Perkins and solid state hemodinamic monitor trough cannula in the Anterior Chamber before starting the case. Pachimetry was measured be-展开更多
Several methods for investigating the thickness uniformity of polymer thin films are presented as well as their measurement principles. A comparison of these experimental methods is given.The cylindrical lightwave ref...Several methods for investigating the thickness uniformity of polymer thin films are presented as well as their measurement principles. A comparison of these experimental methods is given.The cylindrical lightwave reflection method is found to can obtain the thickness distribution along a certain direction.It is a simple and suitable method to evaluate the film thickness uniformity.展开更多
In order to establish a new method for measuring the dimensions of coarse aggregates, five different-size flat and elongated (F&E) coarse aggregates were glued into two specimens by epoxy resin, respectively, and ...In order to establish a new method for measuring the dimensions of coarse aggregates, five different-size flat and elongated (F&E) coarse aggregates were glued into two specimens by epoxy resin, respectively, and slice images were obtained by X-ray CT, then the aggregates were extracted by the fuzzy c-means clustering algorithm. Attributions of the particle on different cross-sections were determined by the ‘overlap area method’. And unified three-dimensional Cartesian coordinate system was established based on continuous slice images. The coefficient values of spherical harmonics descriptor representing particles surface profile were gained, then each scanned particle was represented by 60×120 discrete points conformably with spherical harmonics descriptor. The chord length and direction angles were determined by the calculation. With the major axis (L) and orthogonal axis (W and T), the calculated results were compared with those measured by caliper. It is concluded that the new L, W, and T dimension measuring method is able to take the place of the present manual measurement.展开更多
This paper describes a study of point contact elastohydrodynamic(EHD)lubrication behavior at high speeds(up to 20 m s1).Central film thicknesses were measured by optical interferometry device.The influence of slide-ro...This paper describes a study of point contact elastohydrodynamic(EHD)lubrication behavior at high speeds(up to 20 m s1).Central film thicknesses were measured by optical interferometry device.The influence of slide-roll ratio and operating temperature on the central film thickness was determined.The influence of thermal effects on the reduction of film thickness was discussed via the analysis of numerical simulation method considering thermal effects.Subsequently,the experimental data was used to amend a set of unified parameters for the thermal corrections for different types of oil at high speeds.展开更多
文摘Intraocular pressure (IOP) as measured by Goldmann Applana-tion Tonometry (GAT) is a major risk factor for glaucoma and is commonly used to both screen and classify patients with the disease and to set therapeutic targets and evaluate response to treatment. The accuracy of GAT is known to be affected by Cen-
文摘Purpose of the study is to investigate the validity of clinical estimates of intra ocular pressure with regard to pachimetry in a prospective hospital based in vivo study on twentyeight patients schedule for routine phacoemulsification on topical anestesia Intra ocular pressure was measured with Tonopen, Perkins and solid state hemodinamic monitor trough cannula in the Anterior Chamber before starting the case. Pachimetry was measured be-
文摘Several methods for investigating the thickness uniformity of polymer thin films are presented as well as their measurement principles. A comparison of these experimental methods is given.The cylindrical lightwave reflection method is found to can obtain the thickness distribution along a certain direction.It is a simple and suitable method to evaluate the film thickness uniformity.
基金Project(51038004) supported by the National Natural Science Foundation of ChinaProject(2009318000078) supported by the Western China Communications Construction and Technology Program, China
文摘In order to establish a new method for measuring the dimensions of coarse aggregates, five different-size flat and elongated (F&E) coarse aggregates were glued into two specimens by epoxy resin, respectively, and slice images were obtained by X-ray CT, then the aggregates were extracted by the fuzzy c-means clustering algorithm. Attributions of the particle on different cross-sections were determined by the ‘overlap area method’. And unified three-dimensional Cartesian coordinate system was established based on continuous slice images. The coefficient values of spherical harmonics descriptor representing particles surface profile were gained, then each scanned particle was represented by 60×120 discrete points conformably with spherical harmonics descriptor. The chord length and direction angles were determined by the calculation. With the major axis (L) and orthogonal axis (W and T), the calculated results were compared with those measured by caliper. It is concluded that the new L, W, and T dimension measuring method is able to take the place of the present manual measurement.
基金supported by National Nature Science Foundation of China(Grant Nos.51027007,51021064)the International Science&Technology Cooperation Project(Grant No.2011DFA70980)
文摘This paper describes a study of point contact elastohydrodynamic(EHD)lubrication behavior at high speeds(up to 20 m s1).Central film thicknesses were measured by optical interferometry device.The influence of slide-roll ratio and operating temperature on the central film thickness was determined.The influence of thermal effects on the reduction of film thickness was discussed via the analysis of numerical simulation method considering thermal effects.Subsequently,the experimental data was used to amend a set of unified parameters for the thermal corrections for different types of oil at high speeds.
