Dear Editor,We write to introduce a novel technique of penetrating keratoplasty(PK)with lower risk of graft rejection in high-risk grafts.Corneal transplantation may be required in a variety of conditions such as kera...Dear Editor,We write to introduce a novel technique of penetrating keratoplasty(PK)with lower risk of graft rejection in high-risk grafts.Corneal transplantation may be required in a variety of conditions such as keratoconus,pseudophakic bullous keratopathy(PBK),and corneal scars or dystrophies[1].展开更多
Dear Editor,We would like to report complications of intrastromal bevacizumab injection for corneal neovascularization(CNV)after lamellar keratoplasty(LK)in two patients.CNV is a significant risk factor for graft reje...Dear Editor,We would like to report complications of intrastromal bevacizumab injection for corneal neovascularization(CNV)after lamellar keratoplasty(LK)in two patients.CNV is a significant risk factor for graft rejection.CNV leads to graft failure by disturbing the immune function of the cornea after penetrating keratoplasty(PKP).Studies reported that more than fifty percent of graft failure occurs in this condition[1].展开更多
Transmission Loss (TL) of a glass cylinder tube containing a fluid is studied experimentally. This test specimen represents a typical double layer panel including a fluid. The tests are carried out by using a modified...Transmission Loss (TL) of a glass cylinder tube containing a fluid is studied experimentally. This test specimen represents a typical double layer panel including a fluid. The tests are carried out by using a modified four-microphone standing-wave (impedance) tube for specimens with different lengths, 15 and 30 mm. Each cylinder tube is tested filled with one of the fluids at a time. The fluids are air, water, motor oil and a nanoparticle fluid (in absence of magnetic field). The effects of the cylinder length (thickness), impedance tube terminations, and the containing fluid are discussed. The increasing of the thickness led to an increase of the TL values and a decrease in resonance frequencies. Also, the addition of liquid middle layer led to considerable increase of the TL.展开更多
Applications of Electro-Rheological (ER) or Magneto-Rheological (MR) fluids as typical smart materials have been widely investigated over the past decades (since their introduction in 40’s). The special applications ...Applications of Electro-Rheological (ER) or Magneto-Rheological (MR) fluids as typical smart materials have been widely investigated over the past decades (since their introduction in 40’s). The special applications of these materials as a means of noise suppression are not yet investigated. Constrained Layer Damping (CLD) sheets can be realized by incorporating EMR (ER/MR) materials. In this way, a multilayered damping sheet is obtained with adaptive (tunable) stiffness and damping characteristics. These properties are easily changed in proportion to the electric (magnetic) field applied upon the EMR layer. This notion has been introduced for semi-active vibration control problems. Herein, such panels incorporating EMR material are proposed for adaptive acoustic treatments. Modeling (simulation) of a 3-layered panel with the middle layer being EMR with adjustable properties is carried out in this paper. The tunability of transmission/absorption characteristics of these composite sheets enables us making smart panels for adaptive noise and acoustic treatments. An adaptive performance can be achieved via changing the properties of such panels, on line, according to some sensor outputs. The main objective is to develop proper models to predict the Transmission Loss (TL) of such panels. Also, the TL of this panel is compared with the middle layer of a Newtonian fluid.展开更多
文摘Dear Editor,We write to introduce a novel technique of penetrating keratoplasty(PK)with lower risk of graft rejection in high-risk grafts.Corneal transplantation may be required in a variety of conditions such as keratoconus,pseudophakic bullous keratopathy(PBK),and corneal scars or dystrophies[1].
文摘Dear Editor,We would like to report complications of intrastromal bevacizumab injection for corneal neovascularization(CNV)after lamellar keratoplasty(LK)in two patients.CNV is a significant risk factor for graft rejection.CNV leads to graft failure by disturbing the immune function of the cornea after penetrating keratoplasty(PKP).Studies reported that more than fifty percent of graft failure occurs in this condition[1].
文摘Transmission Loss (TL) of a glass cylinder tube containing a fluid is studied experimentally. This test specimen represents a typical double layer panel including a fluid. The tests are carried out by using a modified four-microphone standing-wave (impedance) tube for specimens with different lengths, 15 and 30 mm. Each cylinder tube is tested filled with one of the fluids at a time. The fluids are air, water, motor oil and a nanoparticle fluid (in absence of magnetic field). The effects of the cylinder length (thickness), impedance tube terminations, and the containing fluid are discussed. The increasing of the thickness led to an increase of the TL values and a decrease in resonance frequencies. Also, the addition of liquid middle layer led to considerable increase of the TL.
文摘Applications of Electro-Rheological (ER) or Magneto-Rheological (MR) fluids as typical smart materials have been widely investigated over the past decades (since their introduction in 40’s). The special applications of these materials as a means of noise suppression are not yet investigated. Constrained Layer Damping (CLD) sheets can be realized by incorporating EMR (ER/MR) materials. In this way, a multilayered damping sheet is obtained with adaptive (tunable) stiffness and damping characteristics. These properties are easily changed in proportion to the electric (magnetic) field applied upon the EMR layer. This notion has been introduced for semi-active vibration control problems. Herein, such panels incorporating EMR material are proposed for adaptive acoustic treatments. Modeling (simulation) of a 3-layered panel with the middle layer being EMR with adjustable properties is carried out in this paper. The tunability of transmission/absorption characteristics of these composite sheets enables us making smart panels for adaptive noise and acoustic treatments. An adaptive performance can be achieved via changing the properties of such panels, on line, according to some sensor outputs. The main objective is to develop proper models to predict the Transmission Loss (TL) of such panels. Also, the TL of this panel is compared with the middle layer of a Newtonian fluid.
