A method of synchronous-high-derivative spectfluor for identification of crude oil and fuel oil pollution is studied. The best operation conditions for the 2nd and 4th deriv, are set. To differentiate oil-spill at riv...A method of synchronous-high-derivative spectfluor for identification of crude oil and fuel oil pollution is studied. The best operation conditions for the 2nd and 4th deriv, are set. To differentiate oil-spill at river and sea, this method is rapid and simple, and the spectra have high resolution power as 'fingerprint'.展开更多
文章针对巡检机器人导航定位与运动控制精度要求,提出了一种基于无线射频识别(Radio Frequency Identification,RFID)定位与模糊比例、积分和微分(Proportional Integral Derivative,PID)的巡检机器人运动控制策略。通过建立六轮差速型...文章针对巡检机器人导航定位与运动控制精度要求,提出了一种基于无线射频识别(Radio Frequency Identification,RFID)定位与模糊比例、积分和微分(Proportional Integral Derivative,PID)的巡检机器人运动控制策略。通过建立六轮差速型巡检机器人运动学模型,对巡检机器人前进与停车状态进行误差分析,设计了基于RFID定位与模糊PID的巡检机器人运动控制策略,选取了0.5、1m/s运行速度及无负载、负载300kg两种情况开展实验分析,经分析该控制策略相较于磁导航+传统PID控制方法准确性更高,误差可控制在1.6cm内,降低了18.4%。结果表明该控制策略的准确性、稳定性均有明显提升,验证了方法的有效性,解决了巡检机器人导航定位与运动控制系统误差大的难题,实现了运动控制的准确性、稳定性和鲁棒性目标。展开更多
Schwann cells play an important role in the peripheral nervous system, especially in nerve repair following injury, so artificial nerve regen- eration requires an effective technique for obtaining purified Schwann cel...Schwann cells play an important role in the peripheral nervous system, especially in nerve repair following injury, so artificial nerve regen- eration requires an effective technique for obtaining purified Schwann cells. In vivo and in vitro pre-degeneration of peripheral nerves have been shown to obtain high-purity Schwann cells. We believed that in vitro pre-degeneration was simple and controllable, and available for the clinic. Thus, we co-cultured the crushed sciatic nerves with bone marrow-derived cells in vitro. Results demonstrated that, 3 hours after injury, a large number of mononuclear cells moved to the crushed nerves and a large number of bone marrow-derived cells infiltrated the nerve segments. These changes promoted the degradation of the nerve segments, and the dedifferentiation and proliferation of Schwann cells. Neural cell adhesion molecule and glial fibrillary acidic protein expression were detected in the crushed nerves. Schwann cell yield was 9.08 ± 2.01 ×104/mg. The purity of primary cultured Schwann cells was 88.4 ± 5.79%. These indicate a successful new method for ob- taining Schwann cells of high purity and yield from adult crushed sciatic nerve using bone marrow-derived cells.展开更多
文摘A method of synchronous-high-derivative spectfluor for identification of crude oil and fuel oil pollution is studied. The best operation conditions for the 2nd and 4th deriv, are set. To differentiate oil-spill at river and sea, this method is rapid and simple, and the spectra have high resolution power as 'fingerprint'.
文摘文章针对巡检机器人导航定位与运动控制精度要求,提出了一种基于无线射频识别(Radio Frequency Identification,RFID)定位与模糊比例、积分和微分(Proportional Integral Derivative,PID)的巡检机器人运动控制策略。通过建立六轮差速型巡检机器人运动学模型,对巡检机器人前进与停车状态进行误差分析,设计了基于RFID定位与模糊PID的巡检机器人运动控制策略,选取了0.5、1m/s运行速度及无负载、负载300kg两种情况开展实验分析,经分析该控制策略相较于磁导航+传统PID控制方法准确性更高,误差可控制在1.6cm内,降低了18.4%。结果表明该控制策略的准确性、稳定性均有明显提升,验证了方法的有效性,解决了巡检机器人导航定位与运动控制系统误差大的难题,实现了运动控制的准确性、稳定性和鲁棒性目标。
基金supported by the Key University Natural Science Research Project of Anhui Province of China,No.KJ2016A870
文摘Schwann cells play an important role in the peripheral nervous system, especially in nerve repair following injury, so artificial nerve regen- eration requires an effective technique for obtaining purified Schwann cells. In vivo and in vitro pre-degeneration of peripheral nerves have been shown to obtain high-purity Schwann cells. We believed that in vitro pre-degeneration was simple and controllable, and available for the clinic. Thus, we co-cultured the crushed sciatic nerves with bone marrow-derived cells in vitro. Results demonstrated that, 3 hours after injury, a large number of mononuclear cells moved to the crushed nerves and a large number of bone marrow-derived cells infiltrated the nerve segments. These changes promoted the degradation of the nerve segments, and the dedifferentiation and proliferation of Schwann cells. Neural cell adhesion molecule and glial fibrillary acidic protein expression were detected in the crushed nerves. Schwann cell yield was 9.08 ± 2.01 ×104/mg. The purity of primary cultured Schwann cells was 88.4 ± 5.79%. These indicate a successful new method for ob- taining Schwann cells of high purity and yield from adult crushed sciatic nerve using bone marrow-derived cells.
