Objectives: Electroretinographic Oscillatory Potentials (Ops) are considered to be the optimal parameter to study the retinal circulation disturbances the present we compared parameters of OPs between different aged r...Objectives: Electroretinographic Oscillatory Potentials (Ops) are considered to be the optimal parameter to study the retinal circulation disturbances the present we compared parameters of OPs between different aged rats under dark adaptationMethods: the scotopic ERG were performed in anaesthetized rats aged 3, 12,24 months. According a window of collective power spectrum field of the OPs was isolated by using the FFT and IFFT of the spectrum analysis program. The parameters in the time and frequency domains were calculated.Results: Results showed that the amplitudes of wavelets and the summed amplitudes of OPs declined with the increase of age. A reduction of the total power and dominated power of OPs was also found after the FFT. But implicit time of each OP and dominant frequency did not change obviously.Conclusions: The present study indicated that change of OPs of rat might be related to senile degeneration of the retina and circulative deficiency in retina in elder rats. Eye Science 1998; 14-27展开更多
A low-power, high-gain circuit for function electrical stimulation （FES） is designed for the microelectronic neural signal regeneration system based on CSMC （CSMC Technologies Corporation） 0. 6μm CMOS （complemen...A low-power, high-gain circuit for function electrical stimulation （FES） is designed for the microelectronic neural signal regeneration system based on CSMC （CSMC Technologies Corporation） 0. 6μm CMOS （complementary metal-oxide-semiconductor transistor） technology. It can be used to stimulate microelectrodes connected with the nerve bundles to regenerate neural signals. This circuit consists of two stages： a full differential folded-cascode amplifier input stage and a complementary class-AB output stage with an overload protection circuit. The rail-to-rail input and output stages are used to ensure a wide range of input and output voltages. The simulation results show that the gain of the circuit is 81 dB; the 3 dB-bandwidth is 295 kHz. The chip occupies a die area of 1.06 mm × 0. 52 mm. The on-wafer measurement results show that under a single supply voltage of ＋ 5 V, the DC power consumption is about 7. 5 mW and the output voltage amplitude is 4. 8 V. The chip can also mn well under single supply voltage of ＋ 3.3 V.展开更多
A new type of differential double-stator swing hydraulic motor, based on double stator structure, was introduced. Compared with the traditional swing hydraulic motors, it could provide various kinds of rotational spee...A new type of differential double-stator swing hydraulic motor, based on double stator structure, was introduced. Compared with the traditional swing hydraulic motors, it could provide various kinds of rotational speeds and torques under the same conditions of input flow rate and pressure. The operating prindple and graphic symbols were described. The output speed and torque characters in multifarious connection modes were analyzed through single-acting differential double-stator swing hydraulic multi-motors. Then the differential connection modes and differential principles of differential double-stator swing hydraulic multi-motors were stated. Furthermore, the output speed and torque characters of double- acting and triple-acting ones in multifarious connection modes were gotten. The interaction between output torque and the displacement ratio was studied. Finally, the internal leakage that influenced the volumetric efficiency was researched. The theoretical and experimental researches show that the differential double-stutor swing hydraulic multi-motors can provide various kinds of rotational speeds and torques. Predictably, this new kind of swing hydraulic multi-motors has broad application prospects in machine tool equipments, engineering machineries, and simulation turntables.展开更多
文摘Objectives: Electroretinographic Oscillatory Potentials (Ops) are considered to be the optimal parameter to study the retinal circulation disturbances the present we compared parameters of OPs between different aged rats under dark adaptationMethods: the scotopic ERG were performed in anaesthetized rats aged 3, 12,24 months. According a window of collective power spectrum field of the OPs was isolated by using the FFT and IFFT of the spectrum analysis program. The parameters in the time and frequency domains were calculated.Results: Results showed that the amplitudes of wavelets and the summed amplitudes of OPs declined with the increase of age. A reduction of the total power and dominated power of OPs was also found after the FFT. But implicit time of each OP and dominant frequency did not change obviously.Conclusions: The present study indicated that change of OPs of rat might be related to senile degeneration of the retina and circulative deficiency in retina in elder rats. Eye Science 1998; 14-27
基金The National Natural Science Foundation of China(No90377013)
文摘A low-power, high-gain circuit for function electrical stimulation （FES） is designed for the microelectronic neural signal regeneration system based on CSMC （CSMC Technologies Corporation） 0. 6μm CMOS （complementary metal-oxide-semiconductor transistor） technology. It can be used to stimulate microelectrodes connected with the nerve bundles to regenerate neural signals. This circuit consists of two stages： a full differential folded-cascode amplifier input stage and a complementary class-AB output stage with an overload protection circuit. The rail-to-rail input and output stages are used to ensure a wide range of input and output voltages. The simulation results show that the gain of the circuit is 81 dB; the 3 dB-bandwidth is 295 kHz. The chip occupies a die area of 1.06 mm × 0. 52 mm. The on-wafer measurement results show that under a single supply voltage of ＋ 5 V, the DC power consumption is about 7. 5 mW and the output voltage amplitude is 4. 8 V. The chip can also mn well under single supply voltage of ＋ 3.3 V.
基金National Natural Science Foundation of China(No.50975246)
文摘A new type of differential double-stator swing hydraulic motor, based on double stator structure, was introduced. Compared with the traditional swing hydraulic motors, it could provide various kinds of rotational speeds and torques under the same conditions of input flow rate and pressure. The operating prindple and graphic symbols were described. The output speed and torque characters in multifarious connection modes were analyzed through single-acting differential double-stator swing hydraulic multi-motors. Then the differential connection modes and differential principles of differential double-stator swing hydraulic multi-motors were stated. Furthermore, the output speed and torque characters of double- acting and triple-acting ones in multifarious connection modes were gotten. The interaction between output torque and the displacement ratio was studied. Finally, the internal leakage that influenced the volumetric efficiency was researched. The theoretical and experimental researches show that the differential double-stutor swing hydraulic multi-motors can provide various kinds of rotational speeds and torques. Predictably, this new kind of swing hydraulic multi-motors has broad application prospects in machine tool equipments, engineering machineries, and simulation turntables.
