Twist characteristics of the ultraviolet-written long-period fiber gratings (UV-LPFGs) are investigated. It was found experimentally that the resonance wavelength of the UV-LPFG shifts to short side proportional to sq...Twist characteristics of the ultraviolet-written long-period fiber gratings (UV-LPFGs) are investigated. It was found experimentally that the resonance wavelength of the UV-LPFG shifts to short side proportional to square of the torsion rate, when it is twisted in both directions of clockwise and counter-clockwise, which is different from that of LPFGs written by CO2 lasers, but similar with that of the corrugated LPFGs. The phenomena can be explained by mechanisms of static compression in twisting and index change caused by photoelastic effect.展开更多
Drugs of this category have the effectsof nourishing the lung to relieve cough andlowering the adverse flow of q(?) to relieveasthma.They are indicated for syndrome ofcough and dyspnea which is very complicat-ed and m...Drugs of this category have the effectsof nourishing the lung to relieve cough andlowering the adverse flow of q(?) to relieveasthma.They are indicated for syndrome ofcough and dyspnea which is very complicat-ed and may be manifested as cough withoutsputum,cough with watery thin sputum orwith yellow thick sputum,cough withdyspnea due to affection by exopathogens,or cough with dyspnea due to consumptivediseases.Appropriate drugs should be chos-en with regard to the different syndromes,展开更多
The Water-splashing Festival may be the most well-known festival of the ethnic minorities by people in China.It became popular because Zhou Enlai the fi rst premier of New China participated in the festival,and is als...The Water-splashing Festival may be the most well-known festival of the ethnic minorities by people in China.It became popular because Zhou Enlai the fi rst premier of New China participated in the festival,and is also remembered by generations of people because the story has展开更多
After my paper (Zeng, 1986b) was published and another (Zeng, 1989) was submitted to the journal, I found two papers written by Arnold (1966) and McIntyre et al. (1987) and received some reprints of Ripa’s papers (19...After my paper (Zeng, 1986b) was published and another (Zeng, 1989) was submitted to the journal, I found two papers written by Arnold (1966) and McIntyre et al. (1987) and received some reprints of Ripa’s papers (1983; 1984; 1987; 1988) in the same field. I thank Drs. Mu Mu and Pedro Ripa very much for showing and sending me these interesting papers.展开更多
A new low noise interface circuit for detecting weak current of micro-sensors is designed.By using the transimpedance amplifier to substitute the charge amplifier,the closed-loop circuit can avoid the phase error of t...A new low noise interface circuit for detecting weak current of micro-sensors is designed.By using the transimpedance amplifier to substitute the charge amplifier,the closed-loop circuit can avoid the phase error of the charge amplifier.Therefore,the phase compensation devices will be cancelled,because there is no phase transformation through the transimpedance amplifier.As well as,by using CCCII devices to implement the high value feedback resistor of the impedance amplifier,the noise of the I-V transformation devices is reduced,comparing with the passive resistor.The floating resistor is easy to be integrated into chips,making the integration of the interface circuit of the intelligent sensors increase.Through the simulation,the phase error of the charge amplifier is almost 9°at 2 kHz and it changes with the working frequency of the micro-sensors making the phase compensation not easy.The value of the floating resistor is 250 kΩ where the bias current is 50 μA.The noise of the active resistor is 0.037 fV2/Hz,comparing with the noise of the passive resistor,which is 4.14 fV2/Hz.展开更多
In the historic times, in China dust rains usually occurred, it was written as the 'dust shower', the 'dust rain' and so on in historical documents. These writings riveted geologists’ attention.
China’s emergence as a key player in Africa, the impact of its presence and its challenges to traditional Western pre-eminence in African economies are one of the hallmarks of the 21st century. Two-way trade, which s...China’s emergence as a key player in Africa, the impact of its presence and its challenges to traditional Western pre-eminence in African economies are one of the hallmarks of the 21st century. Two-way trade, which stood at less than＄1 billion in 2000, has surged to nearly＄40 billion in 2006, while in the same period China’s share of展开更多
ⅠLet G be a domain bounded by a closed rectifiable Jordan curve Γ in the complex plane and G∞ be a complement of the closed domain. We consider the Banach space Ep（G）, p≥1, consisting of functions f（z） with f[...ⅠLet G be a domain bounded by a closed rectifiable Jordan curve Γ in the complex plane and G∞ be a complement of the closed domain. We consider the Banach space Ep（G）, p≥1, consisting of functions f（z） with f[Q（w）]Q’（w）1/p ∈Hp, where z=Q（w） is a function comformably mapping |w|<1 into G. The norm of f（z）∈Ep（G） can be written展开更多
文摘Twist characteristics of the ultraviolet-written long-period fiber gratings (UV-LPFGs) are investigated. It was found experimentally that the resonance wavelength of the UV-LPFG shifts to short side proportional to square of the torsion rate, when it is twisted in both directions of clockwise and counter-clockwise, which is different from that of LPFGs written by CO2 lasers, but similar with that of the corrugated LPFGs. The phenomena can be explained by mechanisms of static compression in twisting and index change caused by photoelastic effect.
文摘Drugs of this category have the effectsof nourishing the lung to relieve cough andlowering the adverse flow of q(?) to relieveasthma.They are indicated for syndrome ofcough and dyspnea which is very complicat-ed and may be manifested as cough withoutsputum,cough with watery thin sputum orwith yellow thick sputum,cough withdyspnea due to affection by exopathogens,or cough with dyspnea due to consumptivediseases.Appropriate drugs should be chos-en with regard to the different syndromes,
文摘The Water-splashing Festival may be the most well-known festival of the ethnic minorities by people in China.It became popular because Zhou Enlai the fi rst premier of New China participated in the festival,and is also remembered by generations of people because the story has
文摘After my paper (Zeng, 1986b) was published and another (Zeng, 1989) was submitted to the journal, I found two papers written by Arnold (1966) and McIntyre et al. (1987) and received some reprints of Ripa’s papers (1983; 1984; 1987; 1988) in the same field. I thank Drs. Mu Mu and Pedro Ripa very much for showing and sending me these interesting papers.
基金Sponsored by the National High Technology Research Development Plan of China(Grant No.2008AA042201)
文摘A new low noise interface circuit for detecting weak current of micro-sensors is designed.By using the transimpedance amplifier to substitute the charge amplifier,the closed-loop circuit can avoid the phase error of the charge amplifier.Therefore,the phase compensation devices will be cancelled,because there is no phase transformation through the transimpedance amplifier.As well as,by using CCCII devices to implement the high value feedback resistor of the impedance amplifier,the noise of the I-V transformation devices is reduced,comparing with the passive resistor.The floating resistor is easy to be integrated into chips,making the integration of the interface circuit of the intelligent sensors increase.Through the simulation,the phase error of the charge amplifier is almost 9°at 2 kHz and it changes with the working frequency of the micro-sensors making the phase compensation not easy.The value of the floating resistor is 250 kΩ where the bias current is 50 μA.The noise of the active resistor is 0.037 fV2/Hz,comparing with the noise of the passive resistor,which is 4.14 fV2/Hz.
文摘In the historic times, in China dust rains usually occurred, it was written as the 'dust shower', the 'dust rain' and so on in historical documents. These writings riveted geologists’ attention.
文摘China’s emergence as a key player in Africa, the impact of its presence and its challenges to traditional Western pre-eminence in African economies are one of the hallmarks of the 21st century. Two-way trade, which stood at less than＄1 billion in 2000, has surged to nearly＄40 billion in 2006, while in the same period China’s share of
文摘ⅠLet G be a domain bounded by a closed rectifiable Jordan curve Γ in the complex plane and G∞ be a complement of the closed domain. We consider the Banach space Ep（G）, p≥1, consisting of functions f（z） with f[Q（w）]Q’（w）1/p ∈Hp, where z=Q（w） is a function comformably mapping |w|<1 into G. The norm of f（z）∈Ep（G） can be written
