Transmission properties of tapered fiber including right cone fiber and bend optical fiber are discussed.The transmission efficiency of the tapered fiber is measured.The curve of transmission efficiency versus taper c...Transmission properties of tapered fiber including right cone fiber and bend optical fiber are discussed.The transmission efficiency of the tapered fiber is measured.The curve of transmission efficiency versus taper cone angle is given.By the scalar wave equation and Gaussian approximation,transmission properties of the two kinds of tapered fibers are analyzed,the power losses caused by taper cone angle and by the bending are also calculated.From the experiments and theoretical analysis,it could come to a conclusion that the wider the taper cone angle is,the higher the transmission efficiency will be.展开更多
To discuss the best way of treatment for obstetric brachial plexus palsy （OBPP）. Method： The 102 cases of OBPP were randomized into two groups： the observation group （51 cases） and the control group （51 cases）...To discuss the best way of treatment for obstetric brachial plexus palsy （OBPP）. Method： The 102 cases of OBPP were randomized into two groups： the observation group （51 cases） and the control group （51 cases）. The observation group was treated by point injection with nerve growth factor （NGF）, acupuncture, and moxibustion. The control group was treated by acupuncture and moxibustion. Result： The result was compared after two courses of treatment. The curative rate of observation group was 35.3% and that of control group 11.8%. The curative and remarkably effective rate was 78.4% and 43.2% respectively. In the two-two comparison, the difference was significant （ P〈 0. 01 ）. Conclusion： The effect of NGF point injection as the main treatment for OBPP was good, worth spreading.展开更多
This paper presents an automatic compensation algorithm for needle tip displacement in order to keep the needle tip always fixed at the skin entry point in the process of needle orientation in robot-assisted percutane...This paper presents an automatic compensation algorithm for needle tip displacement in order to keep the needle tip always fixed at the skin entry point in the process of needle orientation in robot-assisted percutaneous surgery. The algorithm, based on a two-degree-of-freedom （2-DOF） robot wrist （not the mechanically constrained remote center of motion （RCM） mechanism） and a 3-DOF robot ann, firstly calculates the needle tip displacement caused by rotational motion of robot wrist in the arm coordinate frame using the robotic forward kinematics, and then inversely compensates for the needle tip displace- ment by real-time Cartesian motion of robot arm. The algorithm achieves the function of the RCM and eliminates many mechanical and virtual constraints caused by the RCM mechanism. Experimental result demonstrates that the needle tip displacement is within 1 inm in the process of needle orientation.展开更多
文摘Transmission properties of tapered fiber including right cone fiber and bend optical fiber are discussed.The transmission efficiency of the tapered fiber is measured.The curve of transmission efficiency versus taper cone angle is given.By the scalar wave equation and Gaussian approximation,transmission properties of the two kinds of tapered fibers are analyzed,the power losses caused by taper cone angle and by the bending are also calculated.From the experiments and theoretical analysis,it could come to a conclusion that the wider the taper cone angle is,the higher the transmission efficiency will be.
文摘To discuss the best way of treatment for obstetric brachial plexus palsy （OBPP）. Method： The 102 cases of OBPP were randomized into two groups： the observation group （51 cases） and the control group （51 cases）. The observation group was treated by point injection with nerve growth factor （NGF）, acupuncture, and moxibustion. The control group was treated by acupuncture and moxibustion. Result： The result was compared after two courses of treatment. The curative rate of observation group was 35.3% and that of control group 11.8%. The curative and remarkably effective rate was 78.4% and 43.2% respectively. In the two-two comparison, the difference was significant （ P〈 0. 01 ）. Conclusion： The effect of NGF point injection as the main treatment for OBPP was good, worth spreading.
文摘This paper presents an automatic compensation algorithm for needle tip displacement in order to keep the needle tip always fixed at the skin entry point in the process of needle orientation in robot-assisted percutaneous surgery. The algorithm, based on a two-degree-of-freedom （2-DOF） robot wrist （not the mechanically constrained remote center of motion （RCM） mechanism） and a 3-DOF robot ann, firstly calculates the needle tip displacement caused by rotational motion of robot wrist in the arm coordinate frame using the robotic forward kinematics, and then inversely compensates for the needle tip displace- ment by real-time Cartesian motion of robot arm. The algorithm achieves the function of the RCM and eliminates many mechanical and virtual constraints caused by the RCM mechanism. Experimental result demonstrates that the needle tip displacement is within 1 inm in the process of needle orientation.
