The linear and nonlinear Jaynes-Cummings model for the multiphoton transition

With the Jaynes-Cummings model, we have studied the atom and light field quantum entanglement of multiphoton transition, and researched the effect of initial state superposition coefficient $C_{1}$, the transition photon number $N$, the quantum discord $\delta$ and the nonlinear coefficient $\chi$ on the quantum entanglement degrees. We have given the quantum entanglement degrees curves with time evolution, and obtained some results, which should have been used in quantum computing and quantum information.Comment: arXiv admin note: text overlap with arXiv:1404.0821, arXiv:1205.0979 by other author

Surface Roughness Models and Their Experimental Validation in Micro Milling of 6061-T6 Al Alloy by Response Surface Methodology

Due to the widespread use of high-accuracy miniature and micro features or components, it is required to predict the machined surface performance of the micro milling processes. In this paper, a new predictive model of the surface roughness is established by response surface method (RSM) according to the micro milling experiment of 6061-T6 aluminum alloy which is carried out based on the central composite circumscribed (CCC) design. Then the model is used to analyze the effects of parameters on the surface roughness, and it can be concluded that the surface roughness increases with the increasing of the feed rate and the decreasing of the spindle speed. At last, based on the model the contour map of the surface roughness and material removal rate is established for optimizing the process parameters to improve the cutting efficiency with good surface roughness. The prediction results from the model have good agreement with the experimental results

Clinical observation on Aralia echinocauIis Hand Mazz Capsula-2 in knee joint of osteoarthritis

目的  观测刺老苞胶囊-2号临床治疗膝关节骨性关节炎的效果。 方法  将2013～2014年门诊收治的膝关节骨性关节炎患者90例(男50例、女40例)分为：治疗-1组35例（男20例，女15例），治疗-2组20例（男10例，女10例），对照组35例（男20例，女15例）。治疗-1组口服刺老苞胶囊-2号，治疗-2组口服刺老苞胶囊-2号+芬必得胶囊，对照组口服芬必得胶囊。连续服药60d后，观察主要症状缓解情况，并按照膝关节功能评分标准比较各组治疗前后效果。 结果  与对照组（总有效率91.43%）相比，治疗-1组（总有效率85.71%）疗效稍逊，治疗-2组（总有效率95.00%）疗效稍好，但组间差异性均不显著（P＞0.05)。 结论  本实验室制备的刺老苞胶囊-2号对膝关节骨性关节炎有一定的治疗效果，如配合芬必得胶囊共同使用，临床疗效更好。Objective: To observe the effect of Aralia echinocauIis Hand. Mazz capsula-2 on the treatment of knee osteoarthritis．Method: 90 cases of knee osteoarthritis (Male 50 cases / Female 40 cases) were collected in 2013 and 2014, and they were divided into three groups. 35 persons (Male 20 cases / Female 15 cases) in treatment group-1 received Aralia echinocauIis Hand. Mazz capsula-2, 20 persons (Male 10 cases / Female 10 cases) in treatment group-2 received Aralia echinocauIis Hand. Mazz capsula-2 +finbid, 35 persons (Male 20 cases / Female 15 cases) in control group received finbid for 60 days in a course of treatment．Result: Compared with control group (91.43%), treatment group-1 ′s effective rate (85.71%) was lower and treatment group-2′s effective rate (95.00%) was higher, but the difference in different groups was no statistically significant (P＞0.05)．Conclusion: Aralia echinocauIis Hand. Mazz capsula-2 in the treatment of knee osteoarthritis showed good efficacy, joint pain could be shortened．If patients were cured by finbid with Aralia echinocauIis Hand. Mazz capsula-2 together, they would get better clinical curative effect

Calibration of the Timing Performance of GECAM-C

As a new member of the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) after GECAM-A and GECAM-B, GECAM-C (originally called HEBS), which was launched on board the SATech-01 satellite on July 27, 2022, aims to monitor and localize X-ray and gamma-ray transients from $\sim$ 6 keV to 6 MeV. GECAM-C utilizes a similar design to GECAM but operates in a more complex orbital environment. In this work, we utilize the secondary particles simultaneously produced by the cosmic-ray events on orbit and recorded by multiple detectors, to calibrate the relative timing accuracy between all detectors of GECAM-C. We find the result is 0.1 $\mu \rm s$, which is the highest time resolution among all GRB detectors ever flown and very helpful in timing analyses such as minimum variable timescale and spectral lags, as well as in time delay localization. Besides, we calibrate the absolute time accuracy using the one-year Crab pulsar data observed by GECAM-C and Fermi/GBM, as well as GECAM-C and GECAM-B. The results are $2.02\pm 2.26\ \mu \rm s$ and $5.82\pm 3.59\ \mu \rm s$, respectively. Finally, we investigate the spectral lag between the different energy bands of Crab pulsar observed by GECAM and GBM, which is $\sim -0.2\ {\rm \mu s\ keV^{-1}}$.Comment: submitte

The Minimum Variation Timescales of X-ray bursts from SGR J1935+2154

The minimum variation timescale (MVT) of soft gamma-ray repeaters can be an important probe to estimate the emission region in pulsar-like models, as well as the Lorentz factor and radius of the possible relativistic jet in gamma-ray burst (GRB)-like models, thus revealing their progenitors and physical mechanisms. In this work, we systematically study the MVTs of hundreds of X-ray bursts (XRBs) from SGR J1935+2154 observed by {\it Insight}-HXMT, GECAM and Fermi/GBM from July 2014 to Jan 2022 through the Bayesian Block algorithm. We find that the MVTs peak at $\sim$ 2 ms, corresponding to a light travel time size of about 600 km, which supports the magnetospheric origin in pulsar-like models. The shock radius and the Lorentz factor of the jet are also constrained in GRB-like models. Interestingly, the MVT of the XRB associated with FRB 200428 is $\sim$ 70 ms, which is longer than that of most bursts and implies its special radiation mechanism. Besides, the median of MVTs is 7 ms, shorter than the median MVTs of 40 ms and 480 ms for short GRBs or long GRBs, respectively. However, the MVT is independent of duration, similar to GRBs. Finally, we investigate the energy dependence of MVT and suggest that there is a marginal evidence for a power-law relationship like GRBs but the rate of variation is at least about an order of magnitude smaller. These features may provide an approach to identify bursts with a magnetar origin.Comment: accepted for publication in ApJ

Notolutesins A–J, Dolabrane-Type Diterpenoids from the Chinese Liverwort Notoscyphus lutescens

Ten new dolabrane-type diterpenoids, notolutesins A–J (1–10), were isolated from the Chinese liverwort Notoscyphus lutescens, along with four known compounds. The structures of the new compounds were established on the basis of extensive spectroscopic data, and that of 1 was confirmed by single-crystal X-ray crystallography. The absolute configuration of 1 was determined by comparing its experimental and calculated electronic circular dichroism spectra. All of the isolates were evaluated for their cytotoxicity against a small panel of human cancer cell lines, and compound 1 exhibited an IC50 value of 6.2 μM against the PC3 human prostate cancer cell line