The effects of kerosene flow rate on the microstructure and wearing properties were investigated for Fe-based amorphous coatings sprayed by High Velocity Oxygen Fuel (HVOF).The microstructures and wearing properties o...The effects of kerosene flow rate on the microstructure and wearing properties were investigated for Fe-based amorphous coatings sprayed by High Velocity Oxygen Fuel (HVOF).The microstructures and wearing properties of the Fe-based amorphous coatings were analyzed with scanning electron microscope (SEM),X-ray diffraction analyzer (XRD),and ball-on-disc tribometer (CFT-1),respectively.The experimental results show that the well interfacial bonding can be observed between the amorphous coating layer and the substrate,and the porosity in amorphous coating layer is less to 1%.Only some crystalline a-Fe and FeO phases can be detected by XRD in the amorphous coatings,while the amorphous content is up to 99.4%.The wearing coefficient is near to 0.15,which is superior to SUS316 of 0.28.As the increasing of wearing loads,the failure mode is changed from oxidation wear to the composite of oxidation and abrasive wear.展开更多
An autocorrelation system by second harmonic generation with organic crystal POM is described.Picosecond optical pulses produced by a 1.55μm gain-switching distributed feedback laser diode have been measured and the ...An autocorrelation system by second harmonic generation with organic crystal POM is described.Picosecond optical pulses produced by a 1.55μm gain-switching distributed feedback laser diode have been measured and the detection sensitivity of the system of 70μW for average power is obtained.展开更多
In the current waste gas sampling of fixed source,it is required that deviation of tracking rate of constant velocity sampling should not be more than 10%.When flow rate of the waste gas is less than 5 m/s,the trackin...In the current waste gas sampling of fixed source,it is required that deviation of tracking rate of constant velocity sampling should not be more than 10%.When flow rate of the waste gas is less than 5 m/s,the tracking rate can not meet this requirement.The sampling of fixed velocity can meet the requirement of particulate matter sampling on gas collection volume at low velocity.Through the comparison of two different methods for the determination of particulate matter in waste gas under the low flow velocity of flue gas,it was found that there were some differences between the fixed velocity measurement and the constant velocity measurement.The results showed that measurement result of the fixed velocity was higher than that of constant velocity measurement under low velocity.At the same time,the deviation of fixed velocity measurement was not obvious under different low velocity.展开更多
N-soliton (N>2) interaction in optical fibers including third-order dispersion is simulated numerically.In equal amplitude soliton transmission,the coalescence resulted from the mutual interaction among N solitons ...N-soliton (N>2) interaction in optical fibers including third-order dispersion is simulated numerically.In equal amplitude soliton transmission,the coalescence resulted from the mutual interaction among N solitons still exists,while in the unequal case,soliton interaction can not be removed but becomes more serious due to the effect of third-order dispersion.Therefore,we can not consider third-order dispersion as an utilizable factor for removing soliton interaction.展开更多
基金Funded by the National Natural Science Foundation of China(No.51965044)the Basic Pre Research of General Armament Department(No.41423060313)。
文摘The effects of kerosene flow rate on the microstructure and wearing properties were investigated for Fe-based amorphous coatings sprayed by High Velocity Oxygen Fuel (HVOF).The microstructures and wearing properties of the Fe-based amorphous coatings were analyzed with scanning electron microscope (SEM),X-ray diffraction analyzer (XRD),and ball-on-disc tribometer (CFT-1),respectively.The experimental results show that the well interfacial bonding can be observed between the amorphous coating layer and the substrate,and the porosity in amorphous coating layer is less to 1%.Only some crystalline a-Fe and FeO phases can be detected by XRD in the amorphous coatings,while the amorphous content is up to 99.4%.The wearing coefficient is near to 0.15,which is superior to SUS316 of 0.28.As the increasing of wearing loads,the failure mode is changed from oxidation wear to the composite of oxidation and abrasive wear.
基金Supported by the National Natural Science Foundation of China.
文摘An autocorrelation system by second harmonic generation with organic crystal POM is described.Picosecond optical pulses produced by a 1.55μm gain-switching distributed feedback laser diode have been measured and the detection sensitivity of the system of 70μW for average power is obtained.
基金Supported by the Shihezi Science and Technology Plan(2018JZ08)the National Natural Science Foundation of China(21667026)
文摘In the current waste gas sampling of fixed source,it is required that deviation of tracking rate of constant velocity sampling should not be more than 10%.When flow rate of the waste gas is less than 5 m/s,the tracking rate can not meet this requirement.The sampling of fixed velocity can meet the requirement of particulate matter sampling on gas collection volume at low velocity.Through the comparison of two different methods for the determination of particulate matter in waste gas under the low flow velocity of flue gas,it was found that there were some differences between the fixed velocity measurement and the constant velocity measurement.The results showed that measurement result of the fixed velocity was higher than that of constant velocity measurement under low velocity.At the same time,the deviation of fixed velocity measurement was not obvious under different low velocity.
文摘N-soliton (N>2) interaction in optical fibers including third-order dispersion is simulated numerically.In equal amplitude soliton transmission,the coalescence resulted from the mutual interaction among N solitons still exists,while in the unequal case,soliton interaction can not be removed but becomes more serious due to the effect of third-order dispersion.Therefore,we can not consider third-order dispersion as an utilizable factor for removing soliton interaction.
