This Paper focuses on the compensated utilization of resource assets such aswireless frequency. It supplies the methods of estimating value of resource assets based on theanalysis of its characteristics. It also analy...This Paper focuses on the compensated utilization of resource assets such aswireless frequency. It supplies the methods of estimating value of resource assets based on theanalysis of its characteristics. It also analyzes the compensated policy-making and its affects onthe Telecommunication Service Providers (TSP) performance gained by using resource assets. Theresults of the research indicate that the compensated utilization will promote the TSP to improvetheir economic efficiency, and aid to build a fairer competitive environment in TelecommunicationService Industry (TSI) in China.展开更多
A mode-locked(ML)picosecond ytterbium-doped thin disk laser using a monolayer Mo S2as the saturable absorber(SA)is demonstrated.The monolayer MoS2 is fabricated through the method of low-pressure chemical vapor de...A mode-locked(ML)picosecond ytterbium-doped thin disk laser using a monolayer Mo S2as the saturable absorber(SA)is demonstrated.The monolayer MoS2 is fabricated through the method of low-pressure chemical vapor deposition.The laser directly produces stable ML picosecond pulses at a slope efficiency of 9.71%.The maximum output power is approximately 890 mW,while the corresponding repetition,pulse energy,and pulse duration are 48.6 MHz,18.3 nJ,and 13.1 ps,respectively.Results suggest that the monolayer MoS2 is a promising SA for ultrafast lasers system.展开更多
To solve the rate-dependent hysteresis compensation problem in fast steering mirror(FSM) systems, an improved Prandtl-Ishlinskii(P-I) model is proposed in this paper. The proposed model is formulated by employing a li...To solve the rate-dependent hysteresis compensation problem in fast steering mirror(FSM) systems, an improved Prandtl-Ishlinskii(P-I) model is proposed in this paper. The proposed model is formulated by employing a linear density function into the STOP operator. By this way, the proposed model has a relatively simple mathematic format, which can be applied to compensate the rate-dependent hysteresis directly. Adaptive differential evolution algorithm is utilized to obtain the accurate parameters of the proposed model. A fast steering mirror control system is established to demonstrate the validity and feasibility of the improved P-I model. Comparative experiments with different input signals are performed and analyzed, and the results show that the proposed model not only suppresses the rate-dependent hysteresis effectively, but also obtains high tracking precision.展开更多
文摘This Paper focuses on the compensated utilization of resource assets such aswireless frequency. It supplies the methods of estimating value of resource assets based on theanalysis of its characteristics. It also analyzes the compensated policy-making and its affects onthe Telecommunication Service Providers (TSP) performance gained by using resource assets. Theresults of the research indicate that the compensated utilization will promote the TSP to improvetheir economic efficiency, and aid to build a fairer competitive environment in TelecommunicationService Industry (TSI) in China.
基金supported by the National Basic Research Program of China(No.2011CB808101)the Chinese Academy of Sciencethe National Natural Science Foundation of China(Nos.11127901,10734080,61221064,60908008,and 61078037)
文摘A mode-locked(ML)picosecond ytterbium-doped thin disk laser using a monolayer Mo S2as the saturable absorber(SA)is demonstrated.The monolayer MoS2 is fabricated through the method of low-pressure chemical vapor deposition.The laser directly produces stable ML picosecond pulses at a slope efficiency of 9.71%.The maximum output power is approximately 890 mW,while the corresponding repetition,pulse energy,and pulse duration are 48.6 MHz,18.3 nJ,and 13.1 ps,respectively.Results suggest that the monolayer MoS2 is a promising SA for ultrafast lasers system.
基金supported by the Twelfth Five Year Research Project(No.2015syhz0023)
文摘To solve the rate-dependent hysteresis compensation problem in fast steering mirror(FSM) systems, an improved Prandtl-Ishlinskii(P-I) model is proposed in this paper. The proposed model is formulated by employing a linear density function into the STOP operator. By this way, the proposed model has a relatively simple mathematic format, which can be applied to compensate the rate-dependent hysteresis directly. Adaptive differential evolution algorithm is utilized to obtain the accurate parameters of the proposed model. A fast steering mirror control system is established to demonstrate the validity and feasibility of the improved P-I model. Comparative experiments with different input signals are performed and analyzed, and the results show that the proposed model not only suppresses the rate-dependent hysteresis effectively, but also obtains high tracking precision.