Many environmental chemicals,including some smallmolecule petrochemical products are taken up by animalbody via,namely,respiratory tract,i.e.by the processof inhalation.
A new chromatic dispersion(CD) monitoring method is proposed, and the CD monitoring is achieved on the whole range of 0—600 ps/nm. A dual-polarization(DP)-1 024 quadrature amplitude modulation(QAM) 400 Gbit/s CD moni...A new chromatic dispersion(CD) monitoring method is proposed, and the CD monitoring is achieved on the whole range of 0—600 ps/nm. A dual-polarization(DP)-1 024 quadrature amplitude modulation(QAM) 400 Gbit/s CD monitoring system is built using OptiS ystem14.0 software. With different optical signal to noise ratio(OSNR) values, different filter bandwidths or different duty cycles, the simulations are carried out. The simulation results show that this new CD monitoring method can be less affected by noise and has a high tolerance for different filter bandwidths. At the same time, this method can do effective CD monitoring on the signal with duty cycle greater than 80%. A high sensitivity in 0—200 ps/nm can be achieved using this CD monitoring method. The technique supports a wide range of data traffic and enhances operation flexibility of optical networks.展开更多
In recent years, Liu Duan and Zhang Jie-fang respectively studied the motion of constant mass mechanical system in inertial reference frame, generalized the wall-known
There are many researchers discussing the problem of limit cycle of plane differential system of n degrees (E)_n with the integral curves of quadratic algebras. The mathematical model to express the living relation be...There are many researchers discussing the problem of limit cycle of plane differential system of n degrees (E)_n with the integral curves of quadratic algebras. The mathematical model to express the living relation between two species described in the field展开更多
The author proves that any quadratic system in the plane can be changed into the quadratic system （E<sub>1</sub>） or （E<sub>2</sub>） by means of linear transformations, and then gives a nec...The author proves that any quadratic system in the plane can be changed into the quadratic system （E<sub>1</sub>） or （E<sub>2</sub>） by means of linear transformations, and then gives a necessary and sufficient condition for the systems （E<sub>1</sub>） and （E<sub>2</sub>） to be bounded for t≥0 and to have precisely one monotone unboundol orbit for t≥0 respectively.展开更多
Over the past two decades, the study of green-plant and algal photosynthesis has been greatly facilitated by the availability of subchloroplast particles enriched in one or the other of the two photosystems. Although ...Over the past two decades, the study of green-plant and algal photosynthesis has been greatly facilitated by the availability of subchloroplast particles enriched in one or the other of the two photosystems. Although photochemically active particles highly euriched in Photosystem Ⅱ (PS Ⅱ) have been prepared展开更多
Using a laser pulse to measure the distance between the laser station and the satellites equipped with retro-reflectors is a high precision technique for satellite tracking. It can be applied to accurately determine t...Using a laser pulse to measure the distance between the laser station and the satellites equipped with retro-reflectors is a high precision technique for satellite tracking. It can be applied to accurately determine the orbit of satellite, to monitor the earth movements such as polar motion, rotation and crustal movements, etc., and to measure the distances between the laser stations. So it is of importance to astro-geodynamics, geodesy and seismology.展开更多
A neural network Smith predictive control strategy is proposed to deal with inpu t and feedback time delays in telerobot systems. The delay time is assumed to b e invariant and unknown. The proposed control structure...A neural network Smith predictive control strategy is proposed to deal with inpu t and feedback time delays in telerobot systems. The delay time is assumed to b e invariant and unknown. The proposed control structure consists of a slave syst em and a master controller. In the slave system, a recurrent neural network (RNN ) with on-line weight tuning algorithm is employed to approximate the dynamics of the time-delay-free nonlinear plant, which is used to linearize the slave s ystem. The master controller is a Smith predictor for the linearized slave syste m, which provides prediction and maintains the desirable tracking performance. S tability propriety is guaranteed based on the Lyapunov method. A simulation of a two-link robotic manipulator is provided to illustrate the effectiveness of th e proposed control strategy.展开更多
文摘Many environmental chemicals,including some smallmolecule petrochemical products are taken up by animalbody via,namely,respiratory tract,i.e.by the processof inhalation.
基金supported by the National Natural Science Foundation of China(Nos.61274121 and 61574080)
文摘A new chromatic dispersion(CD) monitoring method is proposed, and the CD monitoring is achieved on the whole range of 0—600 ps/nm. A dual-polarization(DP)-1 024 quadrature amplitude modulation(QAM) 400 Gbit/s CD monitoring system is built using OptiS ystem14.0 software. With different optical signal to noise ratio(OSNR) values, different filter bandwidths or different duty cycles, the simulations are carried out. The simulation results show that this new CD monitoring method can be less affected by noise and has a high tolerance for different filter bandwidths. At the same time, this method can do effective CD monitoring on the signal with duty cycle greater than 80%. A high sensitivity in 0—200 ps/nm can be achieved using this CD monitoring method. The technique supports a wide range of data traffic and enhances operation flexibility of optical networks.
文摘In recent years, Liu Duan and Zhang Jie-fang respectively studied the motion of constant mass mechanical system in inertial reference frame, generalized the wall-known
文摘There are many researchers discussing the problem of limit cycle of plane differential system of n degrees (E)_n with the integral curves of quadratic algebras. The mathematical model to express the living relation between two species described in the field
文摘The author proves that any quadratic system in the plane can be changed into the quadratic system （E<sub>1</sub>） or （E<sub>2</sub>） by means of linear transformations, and then gives a necessary and sufficient condition for the systems （E<sub>1</sub>） and （E<sub>2</sub>） to be bounded for t≥0 and to have precisely one monotone unboundol orbit for t≥0 respectively.
文摘Over the past two decades, the study of green-plant and algal photosynthesis has been greatly facilitated by the availability of subchloroplast particles enriched in one or the other of the two photosystems. Although photochemically active particles highly euriched in Photosystem Ⅱ (PS Ⅱ) have been prepared
文摘Using a laser pulse to measure the distance between the laser station and the satellites equipped with retro-reflectors is a high precision technique for satellite tracking. It can be applied to accurately determine the orbit of satellite, to monitor the earth movements such as polar motion, rotation and crustal movements, etc., and to measure the distances between the laser stations. So it is of importance to astro-geodynamics, geodesy and seismology.
文摘A neural network Smith predictive control strategy is proposed to deal with inpu t and feedback time delays in telerobot systems. The delay time is assumed to b e invariant and unknown. The proposed control structure consists of a slave syst em and a master controller. In the slave system, a recurrent neural network (RNN ) with on-line weight tuning algorithm is employed to approximate the dynamics of the time-delay-free nonlinear plant, which is used to linearize the slave s ystem. The master controller is a Smith predictor for the linearized slave syste m, which provides prediction and maintains the desirable tracking performance. S tability propriety is guaranteed based on the Lyapunov method. A simulation of a two-link robotic manipulator is provided to illustrate the effectiveness of th e proposed control strategy.
