A method of fabricating pure germanium dioxide hollow-core fibers has been introduced for the first time. The output power of the fabricated fiber can come to 18 W, with the transmission loss of 1.23 dB/m at 10.6 μm....A method of fabricating pure germanium dioxide hollow-core fibers has been introduced for the first time. The output power of the fabricated fiber can come to 18 W, with the transmission loss of 1.23 dB/m at 10.6 μm. The mechanism of transmitting CO2 laser by the fiber is analyzed, the transmitting loss is further discussed and its application fields are envisaged.展开更多
A method of fabricating pure germanium dioxide hollow-core fibers has been introduced for the first time. The inner diameter of the fiber is φ0.8mm, with the transmission loss of 1.23dB/m at 10.6μm. The mechanism of...A method of fabricating pure germanium dioxide hollow-core fibers has been introduced for the first time. The inner diameter of the fiber is φ0.8mm, with the transmission loss of 1.23dB/m at 10.6μm. The mechanism of transmitting CO_2 laser by the fiber is analyzed. The transmitting performances are discussed and its application fields are envisaged.展开更多
A vibrationally excitation spectrum of the A(1A2) ← X(1A1 ) and B(1 B1 )←X(1 A1 ) transition of suifur dioxide (SO2 ) was observed by using the degenerate four-wave laixing (DFWM) technique. For comparison, the dire...A vibrationally excitation spectrum of the A(1A2) ← X(1A1 ) and B(1 B1 )←X(1 A1 ) transition of suifur dioxide (SO2 ) was observed by using the degenerate four-wave laixing (DFWM) technique. For comparison, the direct absorption spectrum of SO2 was also presented. The DFWM signal intensity was investigated as a function of N2 buffer gas pressure. It was found that the signal intensity enhanced 25-fold with the addition of 100 kPa N2 gas.展开更多
On the basis of previous work,the influence of CeO_2 on the corrosion resistance of laser-alloyed M_(80)S_(20),where M signified a metallic content,predominantly iron,and S represents a metalloid content specifically ...On the basis of previous work,the influence of CeO_2 on the corrosion resistance of laser-alloyed M_(80)S_(20),where M signified a metallic content,predominantly iron,and S represents a metalloid content specifically boron,silicon,and carbon,was further studied by comparative electrochemical test using optical microscope,scanning electron microscope,potentiostat and a X-Y recorder in this paper.The results shown that the addition of CeO_2 can improve the corrosion resistance of laser-alloyed M80S20 alloy layer significantly.展开更多
The relationship between gastric mucosal blood flow (GMBF) and gastric acid secretionwere studied in rats by using secretory stimulant (pentagastrin)and inhibitor(cimetidine). GMBFwas measured by Laser Doppler flowmet...The relationship between gastric mucosal blood flow (GMBF) and gastric acid secretionwere studied in rats by using secretory stimulant (pentagastrin)and inhibitor(cimetidine). GMBFwas measured by Laser Doppler flowmetry (LDF) and gastric mucosal pH determined by microglasspH electrode. GMBF increased and gastric mucosal pH decreased significantly after intravenous injec-tion of 6μg/kg of pentagastrin; nevertheless GMBF decreased and gastric mucosal pH increasedmarkedly after intravenous administration of 100mg/kg of cimetidine. This indicates that pentagastrincan increase GMBF and gastric acid secretion, and cimetidine can decrease GMBF and gastric acidsecretion in rats, proving the close relationship between GMBF and gastric acid secretion in rats.展开更多
An accurate method of determining gain coefficients of pulse RF-discharge CO2 laser is developed, which involves the use of both the regular 00o1 and 00o2 laser transitions as probes of CO2 laser. The results indicate...An accurate method of determining gain coefficients of pulse RF-discharge CO2 laser is developed, which involves the use of both the regular 00o1 and 00o2 laser transitions as probes of CO2 laser. The results indicate that the majority of transitions in discharge have anomalous gain coefficients under RF-discharge condition. This fact has not been generally recognized and the neglect of overlapping transitions can lead to errors in determining rotational temperature.展开更多
文摘A method of fabricating pure germanium dioxide hollow-core fibers has been introduced for the first time. The output power of the fabricated fiber can come to 18 W, with the transmission loss of 1.23 dB/m at 10.6 μm. The mechanism of transmitting CO2 laser by the fiber is analyzed, the transmitting loss is further discussed and its application fields are envisaged.
基金Supported by the High Technology Research and Development Programme of China
文摘A method of fabricating pure germanium dioxide hollow-core fibers has been introduced for the first time. The inner diameter of the fiber is φ0.8mm, with the transmission loss of 1.23dB/m at 10.6μm. The mechanism of transmitting CO_2 laser by the fiber is analyzed. The transmitting performances are discussed and its application fields are envisaged.
文摘A vibrationally excitation spectrum of the A(1A2) ← X(1A1 ) and B(1 B1 )←X(1 A1 ) transition of suifur dioxide (SO2 ) was observed by using the degenerate four-wave laixing (DFWM) technique. For comparison, the direct absorption spectrum of SO2 was also presented. The DFWM signal intensity was investigated as a function of N2 buffer gas pressure. It was found that the signal intensity enhanced 25-fold with the addition of 100 kPa N2 gas.
文摘On the basis of previous work,the influence of CeO_2 on the corrosion resistance of laser-alloyed M_(80)S_(20),where M signified a metallic content,predominantly iron,and S represents a metalloid content specifically boron,silicon,and carbon,was further studied by comparative electrochemical test using optical microscope,scanning electron microscope,potentiostat and a X-Y recorder in this paper.The results shown that the addition of CeO_2 can improve the corrosion resistance of laser-alloyed M80S20 alloy layer significantly.
文摘The relationship between gastric mucosal blood flow (GMBF) and gastric acid secretionwere studied in rats by using secretory stimulant (pentagastrin)and inhibitor(cimetidine). GMBFwas measured by Laser Doppler flowmetry (LDF) and gastric mucosal pH determined by microglasspH electrode. GMBF increased and gastric mucosal pH decreased significantly after intravenous injec-tion of 6μg/kg of pentagastrin; nevertheless GMBF decreased and gastric mucosal pH increasedmarkedly after intravenous administration of 100mg/kg of cimetidine. This indicates that pentagastrincan increase GMBF and gastric acid secretion, and cimetidine can decrease GMBF and gastric acidsecretion in rats, proving the close relationship between GMBF and gastric acid secretion in rats.
文摘An accurate method of determining gain coefficients of pulse RF-discharge CO2 laser is developed, which involves the use of both the regular 00o1 and 00o2 laser transitions as probes of CO2 laser. The results indicate that the majority of transitions in discharge have anomalous gain coefficients under RF-discharge condition. This fact has not been generally recognized and the neglect of overlapping transitions can lead to errors in determining rotational temperature.
