A real-time performance improvement method for composite time scale

The composite time scale(CTS)provides a stable,accurate,and reliable time scale for modern society.The improvement of CTS’s real-time performance will improve its stability,which strengths related applications’performance.Aiming at this goal,a method achieved by determining the optimal calculation interval and accelerating adjustment stage is proposed in this paper.The determinants of the CTS’s calculation interval(characteristics of the clock ensemble,the measurement noise,the time and frequency synchronization system’s noise and the auxiliary output generator noise floor)are studied and the optimal calculation interval is obtained.We also investigate the effect of ensemble algorithm’s initial parameters on the CTS’s adjustment stage.A strategy to get the reasonable initial parameters of ensemble algorithm is designed.The results show that the adjustment stage can be finished rapidly or even can be shorten to zero with reasonable initial parameters.On this basis,we experimentally generate a distributed CTS with a calculation interval of 500 s and its stability outperforms those of the member clocks when the averaging time is longer than1700 s.The experimental result proves that the CTS’s real-time performance is significantly improved.

A step to the decentralized real-time timekeeping network

The composite time scale(CTS) provides an accurate and stable time-frequency reference for modern science and technology. Conventional CTS always features a centralized network topology, which means that the CTS is accompanied by a local master clock. This largely restricts the stability and reliability of the CTS. We simulate the restriction and analyze the influence of the master clock on the CTS. It proves that the CTS's long-term stability is also positively related to that of the master clock, until the region dominated by the frequency drift of the H-maser(averaging time longer than ~10~5s).Aiming at this restriction, a real-time clock network is utilized. Based on the network, a real-time CTS referenced by a stable remote master clock is achieved. The experiment comparing two real-time CTSs referenced by a local and a remote master clock respectively reveals that under open-loop steering, the stability of the CTS is improved by referencing to a remote and more stable master clock instead of a local and less stable master clock. In this way, with the help of the proposed scheme, the CTS can be referenced to the most stable master clock within the network in real time, no matter whether it is local or remote, making democratic polycentric timekeeping possible.

Theoretical consideration on composite oxide scales and coatings

The present paper discussed some fundamental aspects on composite oxide scales and coatings for protection of alloys from high temperature oxidation, the related thermodynamic conditions, special mechanical characteristics and a sealing mechanism. It was proposed that the oxide scales and coatings with a composite structure should possess superior mechanical properties than that with a single phase oxide. It also showed that the A1203 scales or coatings doped with 3（203 and ZrO2 （or YSZ）-A1203 composite coatings possessed superior properties at high temperatures. In such composite oxide scales and coatings, the fracture resistance of the scales was increased by the toughening effect, the thermal stress was decreased owing to the increase of thermal-expansion coefficients, and A1203 phase could seal the alloy substrate well In addition, the kinetic equation of thermal growth oxide on alloy covered with composite oxide coatings was derived.

Clinical observation of cerebral palsy treated with Chinese massage for promoting the Governor Vessel, benefiting the kidney and strengthening the spleen combined with music therapy

Objective To observe the effects on the range of motion （ROM） of ankle joint and muscular spasm of the lower limbs treated with Chinese massage for promoting the Governor Vessel, benefiting the kidney and strengthening the spleen combined with music therapy in infantile cerebral palsy （CP）. Methods In 286 cases of spasmodic CP, 7 kinds of Chinese massage were adopted, named massage on acupoints to promote circulation of the Governor Vessel, massage for strengthening the spleen and benefiting qi, spine-pinching therapy, segmental massage, foot massage, massage for promoting the recovery of muscle strength and massage for promoting ROM of joints. Chinese massage was applied in musical background. Buddha music and five-element music of Chinese medicine （music of the Heart, Liver and Kidney Meridians） were optioned. The treatment was given once or twice a day and 30 days made one course. The angles of femoral adductor and dorsal flexion of foot as well as the score of composite spasticity scale （CSS） were observed before and after treatment so that the therapeutic effect was assessed. Results In 30 days of treatment, 106 cases （37. 1%） were effective markedly, 172 cases （60. 1%） effective and 8 cases （2.8%） failed. The angle of dorsal flexion of foot was （105.64± 12.66）° and （76.58± 9.89）° before and after treatment respectively; the angle of femoral adductor was （119.89±25.47）° and （158.99± 18.66）° before and after treatment respectively; the score of CSS was （12.39±2.56） and （7. 069 ± 2.97） before and after treatment respectivel, there was significant difference before and after treatment （all P〈0.01）. Conclusion Chinese massage for promoting the Governor Vessel, benefiting the kidney and strengthening the spleen combined with music therapy brings the extremely active effect into play on the recovery of sitting, kneeling, standing and walking for children with CP.