The transient resistance,voltage,and power of a nonlinear GaAs photoconductive semiconductor switch （PCSS） are presented by the finite difference formula to deal with the experiment data, based on the conversation o...The transient resistance,voltage,and power of a nonlinear GaAs photoconductive semiconductor switch （PCSS） are presented by the finite difference formula to deal with the experiment data, based on the conversation of energy in the switch circuit. This method resolves the problem of directly measuring the transient characteristics of PCSS in nonlinear mode. The curve of transient voltage shows that the average electric field of PCSS in the lock-on period is always higher than the Gunn threshold,and increases monotonically. By comparing the transient power curves of the PCSS and the electrical source,it is demonstrated directly that the power shortage leads to the PCSS from the lock-on state into the selfturnoff state,so a controllable turnoff of the PCSS in lock-on by changing the distribution of the circuit power is predicted.展开更多
乌鲁木齐零售渠道增长明显母婴产品有望发力Urumqi：Toy Retail Goes Prosperous with Maternal and Child Products to Rise春节前,当地玩具市场零售较之前有明显增长,但批发渠道则稍显逊色。包装精美大气的产品成为春节顾客送礼的宠儿...乌鲁木齐零售渠道增长明显母婴产品有望发力Urumqi：Toy Retail Goes Prosperous with Maternal and Child Products to Rise春节前,当地玩具市场零售较之前有明显增长,但批发渠道则稍显逊色。包装精美大气的产品成为春节顾客送礼的宠儿,其中盈佳的新威尔机械战警以雷达锁定模式、激光飞弹设计为卖点,售价168元~268元,继续受市场热捧。展开更多
添加ESXi主机管理员账户在一个大型的v Sphere虚拟化平台架构中,一定有很多部ESXi主机,甚至于有多部的v Center Server分散在不同的地理位置,来分散管理所有的ESXi主机与虚拟机,因此,系统管理人员肯定不会只有一位。一般而言,企业总部...添加ESXi主机管理员账户在一个大型的v Sphere虚拟化平台架构中,一定有很多部ESXi主机,甚至于有多部的v Center Server分散在不同的地理位置,来分散管理所有的ESXi主机与虚拟机,因此,系统管理人员肯定不会只有一位。一般而言,企业总部的系统管理人员,通常拥有所有v Center与ESXi主机的管理权限。展开更多
A modified multiwavelength actively mode-locked fiber ring laser is proposed and experimentally demonstrated. In this kind of laser, stable multiwavelengths lasing is achieved by integrating cascaded sampled fiber Bra...A modified multiwavelength actively mode-locked fiber ring laser is proposed and experimentally demonstrated. In this kind of laser, stable multiwavelengths lasing is achieved by integrating cascaded sampled fiber Bragg gratings(SFBGs) into the laser cavity. To implement actively mode-locking technique, a double-ring cavity configuration is used to assure that the cavity lengths for all wavelengths lasing are identical. Thus, simultaneous mode locking of all wavelengths has been successfully achieved by using the same mode-locking signal.展开更多
A high-precision wavelength controller is presented in this paper. It is necessary to find out the difference between the central wavelength of a tunable fiber Fabry-Perot (FFP) filter and that of the input laser, whi...A high-precision wavelength controller is presented in this paper. It is necessary to find out the difference between the central wavelength of a tunable fiber Fabry-Perot (FFP) filter and that of the input laser, while the wavelength control-ler operates at the states of wavelength-scanning and wavelength-locking modes. Firstly, a dynamic simulation model of tunable FFP filter is established, and the dynamic characteristic of tunable FFP filter modulated by an alternating current (AC) signal is simulated. Then the measuring time at wavelength-scanning mode compared with the theory time is discussed, and this time difference shows the difference between the central wavelength of a tunable FFP filter and that of the input laser. At last, the effects on wavelength-locking precision of time delays, including the time delay of opened-loop circuit, the time constant of the closed-loop circuit and the intrinsic hysteresis of piezoelectric (PZT) element, are analyzed. A wavelength controller of tunable FFP filter is designed and prepared. The experimental results at wavelength-locking mode show that a high locking precision is obtained.展开更多
文摘The transient resistance,voltage,and power of a nonlinear GaAs photoconductive semiconductor switch （PCSS） are presented by the finite difference formula to deal with the experiment data, based on the conversation of energy in the switch circuit. This method resolves the problem of directly measuring the transient characteristics of PCSS in nonlinear mode. The curve of transient voltage shows that the average electric field of PCSS in the lock-on period is always higher than the Gunn threshold,and increases monotonically. By comparing the transient power curves of the PCSS and the electrical source,it is demonstrated directly that the power shortage leads to the PCSS from the lock-on state into the selfturnoff state,so a controllable turnoff of the PCSS in lock-on by changing the distribution of the circuit power is predicted.
文摘乌鲁木齐零售渠道增长明显母婴产品有望发力Urumqi：Toy Retail Goes Prosperous with Maternal and Child Products to Rise春节前,当地玩具市场零售较之前有明显增长,但批发渠道则稍显逊色。包装精美大气的产品成为春节顾客送礼的宠儿,其中盈佳的新威尔机械战警以雷达锁定模式、激光飞弹设计为卖点,售价168元~268元,继续受市场热捧。
文摘添加ESXi主机管理员账户在一个大型的v Sphere虚拟化平台架构中,一定有很多部ESXi主机,甚至于有多部的v Center Server分散在不同的地理位置,来分散管理所有的ESXi主机与虚拟机,因此,系统管理人员肯定不会只有一位。一般而言,企业总部的系统管理人员,通常拥有所有v Center与ESXi主机的管理权限。
文摘A modified multiwavelength actively mode-locked fiber ring laser is proposed and experimentally demonstrated. In this kind of laser, stable multiwavelengths lasing is achieved by integrating cascaded sampled fiber Bragg gratings(SFBGs) into the laser cavity. To implement actively mode-locking technique, a double-ring cavity configuration is used to assure that the cavity lengths for all wavelengths lasing are identical. Thus, simultaneous mode locking of all wavelengths has been successfully achieved by using the same mode-locking signal.
基金supported by the National Natural Science Foundation of China (No. 60677024)the National High Technology Research Development Program of China (No. 2009AA03Z418)the Educational Commission of Hubei Province of China (No.B20104401)
文摘A high-precision wavelength controller is presented in this paper. It is necessary to find out the difference between the central wavelength of a tunable fiber Fabry-Perot (FFP) filter and that of the input laser, while the wavelength control-ler operates at the states of wavelength-scanning and wavelength-locking modes. Firstly, a dynamic simulation model of tunable FFP filter is established, and the dynamic characteristic of tunable FFP filter modulated by an alternating current (AC) signal is simulated. Then the measuring time at wavelength-scanning mode compared with the theory time is discussed, and this time difference shows the difference between the central wavelength of a tunable FFP filter and that of the input laser. At last, the effects on wavelength-locking precision of time delays, including the time delay of opened-loop circuit, the time constant of the closed-loop circuit and the intrinsic hysteresis of piezoelectric (PZT) element, are analyzed. A wavelength controller of tunable FFP filter is designed and prepared. The experimental results at wavelength-locking mode show that a high locking precision is obtained.
