Spin frequency evolution and pulse profile variations of the recently re-activated radio magnetar XTE J1810–197

After spending almost a decade in a radio-quiet state, the Anomalous X-ray Pulsar XTE J1810–197 turned back on in early 2018 December. We have observed this radio magnetar at 1.5 GHz with nearly daily cadence since the first detection of radio re-activation on 2018 December 8. In this paper, we report on the current timing properties of XTE J1810–197 and find that the magnitude of the spin frequency derivative has increased by a factor of 2.6 over our 48-d data set. We compare our results with the spin-down evolution reported during its previous active phase in the radio band. We also present total intensity pulse profiles at five different observing frequencies between 1.5 and 8.4 GHz, collected with the Lovell and the Effelsberg telescopes. The profile evolution in our data set is less erratic than what was reported during the previous active phase, and can be seen varying smoothly between observations. Profiles observed immediately after the outburst show the presence of at least five cycles of a very stable ∼50 ms periodicity in the main pulse component that lasts for at least tens of days. This remarkable structure is seen across the full range of observing frequencies.

Image Entropy for the Identification of Chimera States of Spatiotemporal Divergence in Complex Coupled Maps of Matrices

Complex networks of coupled maps of matrices (NCMM) are investigated in this paper. It is shown that a NCMM can evolve into two different steady states—the quiet state or the state of divergence. It appears that chimera states of spatiotemporal divergence do exist in the regions around the boundary lines separating these two steady states. It is demonstrated that digital image entropy can be used as an effective measure for the visualization of these regions of chimera states in different networks (regular, feed-forward, random, and small-world NCMM).

Effects of Exercise on the Pharmacokinetics of Icariin II in Rats

High performance liquid chromatography (HPLC) was established to determine the concentration of Icariin II in rats. The time-dependent changes in rats after taking Icariin II were studied, and the main pharmacokinetic parameters were obtained. The main pharmacokinetic parameters of taking the medicine in a quiet state, taking the medicine after half an hour of exercise and taking the medicine after long-term exercise were compared to verify whether the absorption and utilization of the Icariin II were more favorable in the exercise state; The paper has important guiding significance for guiding athletes to safe medication and further development of this drug.

PO-134 Optogenetics Active SNc DA Neurons Improve Locomotor Activity on Exercise-Induced fatigue Rats

Objective After optogenetics activing SNc DANs, locomotor activity ability of exercise-induced fatigue rats were recorded to research the role of nigra-striatum DA system in central mechanism of motor control. Methods Used male SD rats (220~240g), randomly divided into 6 groups: sham control group (SCG), optogenetics control group (OCG), fatigue group (FG), sham fatigue group (SFG) and optogenetics fatigue group (OFG). Virus ware injected in the right SNc at coordinates (AP:-5.30 mm, R: 2.00 mm, H-8.00 mm). The SCG/SFG injected 1 μ l saline, OCG/OFG injected 1 μl mixed virus(ChR2 with TH Cre,1:1), the fiber implantation site was deeper than the virus injection about 1 mm. Three weeks after surgery, rats attend 7D exhaustive treadmill exercise. After fatigue running, OCG/OFG/SCG/SFG were in the open field. We used two different light delivery schedules: 10 ms pulses at 20 Hz (10s) and 10 ms pulses at 3 Hz (10s). Sampling time were quiet state, 1D exhaustion, 7D exhaustion and recovery 24h. Animals were euthanized after completion of the behavioral tests. Brains were sectioned coronally in 50-μm slices, images were taken using a fluorescence microscope and determined the anatomical location of the optical fiber. Results (1) OCG/OFG obtain expression of ChR2 in DANs, this was not observed in SCG/SFG; Activation of OCG DANs with 20Hz increased the normalized mean global activity (laser on/laser off), and a significant increment in normalized mean global activity (laser on/laser off) when DANs were activated with 3Hz/20Hz in OFG (p<0.05), showing successful transfection of OCG/OFG. (2) Stimulation at 20 Hz was sufficient to improve global activity, the effects of 3 Hz did not significant, showing 20Hz stimulation possibility be related to motor regulation. (3)The global activity and total distance of rats after 7D exhaustion ware significantly lower than of quiet state (p<0.05), the difference from the quiet state and after 24h recovery is not significant, indicating that the decline in locomotor ability caused by exercise induced-fatigue is reversible. (4) The 20 Hz stimulation significantly improved the global activity of 1D and 7D exhausted rats (p<0.05), indicating that 20 Hz stimulation can effectively improve the rats locomotor activity with exercise-induced fatigue compared with 3 Hz stimulation. Conclusions (1) ChR2 virus transfection can effectively active the nigra-striatum DA system, causing changes in motor performance and increasing the locomotor ability of rats; (2) The locomotor ability of rats with exercise-induced fatigue to decrease. The total distance and global activity decreased significantly with exercise-induced fatigue; (3) Photoactivation of SNc DANs can improve the locomotor activity of rats with exercise-induced fatigue. From the perspective of stimulating effect, 20Hz is the most obvious activation reference point (NSFC: 31401018, SKXJX: 2014014, Corresponding [email protected]).

Observations of H2O and OH masers in star-forming regions

We report long-term observations of H2O and OH maser emission sources at wavelengths of 1.35 and 18 cm associated with star-forming regions. Strong quasi-periodic flares of maser emission have been observed. Several sources (in particular, G25.65+1.05, IRAS 16293&minus;2422, Cep A) have displayed strong flares in the H2O line, when their peak flux density raised by a few orders of magnitude above the quiet state. Possible causes of this are discussed.

THEORETICAL ANALYTICAL METHOD IN PROBLEM SOLUTION OF LIQUID VACUUM FREEZING IN QUIET STAT

A generalized closed analytical solution of the problem of a quasi-stationary process in liquid vacuum freezing in a quiet state with regard to the thickness of the frosting layer ξ whereas heretofore numerical solutions of this problem occurred. The advantage of the analytical solutions obtained of the problem of a quasi-stationary vacuum freezing of moisture in a finedispersion state over existing numerical ones consists in the identification of an immanent tie between defining and determined parameters regarding a thickness of the frosting layer ξ. It is also possible to use them directly at the computation without resorting to the help of computers.