The primary goal of this project was educational: to demonstrate Software Defined Radio based prototyping using Visual C++ Express and Code Composer Studio. More specifically an IEEE802.11a Phy [1] compliant baseband ...The primary goal of this project was educational: to demonstrate Software Defined Radio based prototyping using Visual C++ Express and Code Composer Studio. More specifically an IEEE802.11a Phy [1] compliant baseband processor was written in C++ and a radio link demonstrated “live” using a standard PCand the DSK6713 kit from Spectrum Digital [2] for baseband processing at the receiver and transmitter side respectively. To reduce costs without loss of educational value (the algorithms remains the same), the bandwidth was scaled down from 20MHz to 6 kHz to be able to utilize cheap narrowband COTS RF frontends operating at an intermediate frequency of only 12 kHz at the transmitter and receiver sides. This was easily achieved by just reducing the OFDM symbol rate by a suitable factor. The development process is described in detail, emphasizing development tricks to facilitate debugging of this kind of complex baseband processing. For educational purposes some other simpler waveforms was implemented as well.展开更多
氯胺酮(ketamine)和乌拉坦(urethane)对神经细胞活动的影响大小和机制尚存在争议。c-fos是刺激依赖表达的立早基因(immediate early genes),其表达量可反应神经细胞活动的强弱。该研究通过免疫组织化学方法比较观察乌拉坦和盐酸氯胺酮...氯胺酮(ketamine)和乌拉坦(urethane)对神经细胞活动的影响大小和机制尚存在争议。c-fos是刺激依赖表达的立早基因(immediate early genes),其表达量可反应神经细胞活动的强弱。该研究通过免疫组织化学方法比较观察乌拉坦和盐酸氯胺酮急性麻醉对猫初级视皮层细胞中刺激依赖的c-fos蛋白表达的影响。结果显示,氯胺酮组和乌拉坦组初级视皮层各层神经元密度与对照组无显著差异;乌拉坦组视皮层c-fos蛋白免疫阳性细胞密度和免疫反应强度与对照组无显著差异;而盐酸氯胺酮组视皮层细胞中c-fos蛋白免疫阳性细胞密度及免疫反应强度均显著降低。即氯胺酮对视皮层细胞反应的抑制作用较强,而乌拉坦的抑制作用不显著。展开更多
文摘The primary goal of this project was educational: to demonstrate Software Defined Radio based prototyping using Visual C++ Express and Code Composer Studio. More specifically an IEEE802.11a Phy [1] compliant baseband processor was written in C++ and a radio link demonstrated “live” using a standard PCand the DSK6713 kit from Spectrum Digital [2] for baseband processing at the receiver and transmitter side respectively. To reduce costs without loss of educational value (the algorithms remains the same), the bandwidth was scaled down from 20MHz to 6 kHz to be able to utilize cheap narrowband COTS RF frontends operating at an intermediate frequency of only 12 kHz at the transmitter and receiver sides. This was easily achieved by just reducing the OFDM symbol rate by a suitable factor. The development process is described in detail, emphasizing development tricks to facilitate debugging of this kind of complex baseband processing. For educational purposes some other simpler waveforms was implemented as well.
文摘氯胺酮(ketamine)和乌拉坦(urethane)对神经细胞活动的影响大小和机制尚存在争议。c-fos是刺激依赖表达的立早基因(immediate early genes),其表达量可反应神经细胞活动的强弱。该研究通过免疫组织化学方法比较观察乌拉坦和盐酸氯胺酮急性麻醉对猫初级视皮层细胞中刺激依赖的c-fos蛋白表达的影响。结果显示,氯胺酮组和乌拉坦组初级视皮层各层神经元密度与对照组无显著差异;乌拉坦组视皮层c-fos蛋白免疫阳性细胞密度和免疫反应强度与对照组无显著差异;而盐酸氯胺酮组视皮层细胞中c-fos蛋白免疫阳性细胞密度及免疫反应强度均显著降低。即氯胺酮对视皮层细胞反应的抑制作用较强,而乌拉坦的抑制作用不显著。
