高速航电总线数据实时遥测技术研究

为了解决飞行试验中高速航电总线数据实时遥测的测试需求,研究了高速航电总线数据采集及实时遥测的测试技术;面对全新总线架构以及海量实时传输数据,传统的总线测试技术无法满足新的测试需求,设计了高速航电总线数据监听以及遥测传输的测试系统,成功将高速总线数据融合到网络数据采集技术及数字遥测技术中;实际的试验结果表明,该方案能够准确、有效地完成机载高速航电总线数据采集及实时遥测传输,该方案的成功应用,为今后相关的高速总线数据测试提供了重要的参考价值。     

Specific features of complete-absorption measurement in selective intracavity laser spectroscopy

For multimode pulsed dye lasers (of nanosecond and microsecond duration with frequency-dependent losses in the cavity), experimental studies and theoretical calculations have been made of the dependence of the value of the equivalent line width, used as a measure of selective absorption, on the main parameters characterizing the laser, the cavity, and the absorbent. Analytical relations have been obtained which describe the main aspects of complete absorption in lines with dispersion, Gaussian, or mixed spectra profiles, and their experimental testing has been carried out. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 3, pp. 327–332, May–June, 2000.     

Generic guiding principle of HTSC material design for high-field application

Through the analyses on the irreversibility lines (ILLs) under H||c for various high-T_c superconducting (HTSC) single-crystalline samples, we found two universal functions representing ILLs. In these functions, the electromagnetic anisotropy factor γ² plays a crucial role. The appropriate chemical substitution, such as Bi(Pb)2212, is an effective method to improve flux pinning properties via decreasing γ².     

Resonance ionization spectroscopy of radioisotopes at the IGISOL facility, JYFL

The method of resonance ionization spectroscopy for measurements of hyperfine structures and isotope shifts of heavy elements, at the IGISOL facility, Jyväskylä, is discussed. Two laser geometries are considered, with reference to the effect they have on resolution and efficiency of measurements. Results of off line resonance ionization tests on natural sodium are reported.     

A finite difference beam propagation algorithm based on generalized transmission line equations

A wide angle beam propagation algorithm is presented, which is based on generalized transmission line (GTL) equations. Besides the discretization, no further approximation is introduced. In principle, a full vectorial analysis is possible, and anisotropic material can be taken into account. The algorithm has been verified for planar 2D-waveguide devices. The wide angle characteristic has been examined by determining the propagation of tilted Gaussian beams in homogeneous media. Further studies were performed for tilted waveguides and for taper structures. Results for the latter devices were compared with other methods showing a very good agreement.     

屈服后表面裂纹与穿透裂纹的等效裂纹长度换算

在较小范围屈服条件下，将D-M模型和弹塑性线弹簧模型相结合，建立了屈服后一般扁壳表面裂纹的计算模型，导出了其控制方程和相应的COD计算公式。在此基础上，提出了屈服后一般扁壳表面裂纹与平板穿透裂纹的等COD换算方法。通过各种影响因素的分析并去除次要因素，最终给出了该等效换算关系的简单拟合公式。计算结果表明，该分析方法简便且有足够的工程精度，适应于在役压力容器等结构的现场快速断裂评定。     

DNA cleavage,cytotoxic and antioxidant properties of Cistus laurifolius L. extracts

In this study, extracts of the root, branch and leaf parts of Cistus laurifolius L. were prepared using hexane, methylene chloride and ethanol solvents. DNA cleavage, cytotoxic and antioxidant properties of the prepared extracts were then investigated. The cytotoxic properties of the extracts were investigated in A549, DU-145, PNT-1A, MDA-MB231, CRL-4010 and HCT-116 cell lines. Among all prepared extracts, T4 (seed–methylene chloride) extract showed cytotoxic effects on more cancer cell lines compared to other extracts. Antioxidant tests were performed by DPPH (2,2-diphenyl-1-picrylhydrazil) radical scavenging and Folin-Ciocalteu methods. In both tests, it was determined that T7 (seed–ethanol) extract has a very strong antioxidant effect (IC₅₀ = 0,000015 μg/ml for the DPPH method). In DNA cleavage studies, the results obtained confirm the protection of DNA from hydroxyl radical damage in the presence of methanolic plant extracts. Consequently, we determined that some of the Cistus laurifolius L. extracts have significant biological properties on the studied cell lines.     

基于LabVIEW的某型舵机综合性能测试系统

摘要: 某型新研舵机性能需要严格而有效的测试;利用LabVIEW平台,开发了一种舵机综合性能测试系统;整个系统基于PXI总线进行构建,以保证系统测试的精确性和可靠性,能够产生对舵机的控制信号,同时实现数据的采集和存储,波形的实时显示,测试数据的分析、保存和打印等功能;该系统已应用在某型舵机性能测试中;试验结果表明,该系统操作方便,运行稳定,测试结果精确可靠。     

基于激光及三维虚拟场景技术的表面平整度在线检测系统

针对煤矿安全生产实际,本文提出了采用单片机的煤矿井下安全监控分站的设计方案。首先给出了煤矿井下安全监控分站的整体构架,然后详细设计了煤矿井下安全监控分站的信号处理、键盘、显示、报警、通信等各个组成部分,最后使用Proteus软件对设计内容进行仿真验证。设计和仿真结果表明：该设计方案具有可行性,具有一定的实际应用价值。     

AS5643总线优化传输方法研究

针对AS5643总线传输等时数据包时所带来的不确定性问题,提出一种将总线周期分为等时和异步两部分时隙的优化传输方法,能在不影响确定性的前提下引入等时数据包传输。首先对引起不确定性问题的原因进行了分析,然后详细介绍了优化传输方法的原理及工程实现。该优化传输方法经实验证明是正确可行的,可应用于高度综合化的航空电子系统中。