单光束红外光二氧化碳分析仪

介绍了单光束红外光二氧化碳分析仪，该分析仪基于朗伯－比尔定律，采用光源稳流，单片机温度补偿及选用高性能红外探测器等技术，能够对二氧化碳气体进行有效准确的测量和分析，且结构简单，体积小，重量轻，功耗低，响应速度快，可靠性高，具有广阔的应用前景。     

民机大机群可靠性监控实践

结合运七飞机可靠性监控，对多个地区和使用单位和实施大机群可靠性监控的内容和方法作了重点论述。所提出的新方法－分布控制法，用在鉴别可靠性监控参数的警戒状况。该方法和内容，已用于运七可靠性监控中心的具体实践，监控效果好。     

飞机备件需求量的确定方法

飞机备件需求量计算是航空备件计划管理的一项重要内容。对飞机备件的分类及其特性进行了分析，并建立了循环件、非循环件和消耗件的需求量计算实用关系式。对需求量计划在实际中的应用问题，提出些看法和建议。     

Production and evolution of millisecond X-ray and radio pulsars

Observations using the Rossi X-ray Timing Explorer (RXTE) have discovered dozens of accreting neutron stars with millisecond spin periods in low-mass binary star systems. Eighteen are millisecond X-ray pulsars powered by accretion or nuclear burning or both. These stars have magnetic fields strong enough for them to become millisecond rotation-powered (radio) pulsars when accretion ceases. Few, if any, accretion- or rotation-powered pulsars have spin rates higher than 750 Hz. There is strong evidence that the spin-up of some accreting neutron stars is limited by magnetic spin-equilibrium whereas the spin-up of others is halted when accretion ends. Further study will show whether the spin rates of some accretion- or rotation-powered pulsars are or were limited by emission of gravitational radiation.     

XMM-Newton observations of low luminosity Be/X-ray candidates

A small number of early Be stars exhibit X-ray luminosities intermediate between those typical of early type stars and those radiated by Be/X-ray binaries in the quiescent state. We report on XMM-Newton observations of two such Be stars, HD 161103 and SAO 49725 which were originally discovered in a systematic cross-correlation between the ROSAT all-sky survey and SIMBAD. The new observations confirm the X-ray luminosity detected by ROSAT (L_X  10³² erg s⁻¹) and the hardness of their X-ray spectra (thin thermal with kT  8–10 keV or power law with photon index of 1.7) which are both unusual for normal early type stars. We discuss the possible origin of this excess X-ray emission in the light of the models proposed for γ-Cas, magnetic disc-star interaction or accretion onto a compact companion object, neutron star or white dwarf, and compare the properties of these two sources with those of the new massive systems discovered in the XMM- Newton/SSC survey of the Galactic plane.     

Using LASCO-C1 spectroscopy for coronal diagnostics

The LASCO-C1 telescope was designed to perform spectral analysis of coronal structures by means of a tunable Fabry–Pérot interferometer acquiring images at different wavelengths. Results from spectral scans of the Fe xiv 5303 Å green coronal emission line are presented. Physical quantities like the ion temperature (line widths), and the flow velocity along the line of sight (Doppler shifts) are obtained over the entire corona.     

航天器总装模块化生产模式探讨

文章介绍了航天器总装模块化生产思想,建立了航天器总装生产模式成熟度模型,提出模块化是提高航天器制造企业管理柔性、提升企业竞争力的重要途径,针对航天器总装实施特点对航天器总装生产模式进行了模块化构想,根据专业化试点取得的经验提出专业化建设对于加快航天器总装人才培养、优化资源配置等具有显著的现实意义。     

圆台形红外加热笼仿真优化研究

在真空热试验中,圆台形航天器通常选用圆台形的红外加热笼作为外热流模拟装置。文章对圆台形红外加热笼模拟热流进行仿真计算,分别就红外加热笼与被加热面的平行距离对边缘效应的影响和红外笼的锥角对边缘效应的影响进行分析,得到红外加热笼优化设计方法,以提高航天器表面热流密度模拟的均匀性。该方法可用于指导圆台形航天器进行真空热试验时的工装设计。     

The dynamic chromosphere: Pushing the boundaries of observations and models

The interface between the bright solar surface and the million-degree corona continues to hold the key to many unsolved problems in solar physics. Advances in instrumentation now allow us to observe the dynamic structures of the solar chromosphere down to less than $0_{.}^{″}1$ with cadences of just a few seconds and in multiple polarisation states. Such observational progress has been matched by the ever-increasing sophistication of numerical models, which have become necessary to interpret the complex observations. With an emphasis on the quiet Sun, I will review recent progress in the observation and modelling of the chromosphere. Models have come a long way from 1D static atmospheres, but their predictions still fail to reproduce several key observed features. Nevertheless, they have given us invaluable insight into the physical processes that energise the atmosphere. With more physics being added to models, the gap between predictions and observations is narrowing. With the next generation of solar observatories just around the corner, the big question is: will they close the gap?     

高超声速飞行器材料与结构气动热环境模拟方法及试验研究

文章介绍了自行研制的石英灯红外辐射式气动加热试验模拟系统以及使用该系统对高超声速飞行器材料与结构进行的高温热评价试验。本热试验系统可实现升温速率高至200 ℃/s的非线性热冲击过程的动态模拟;能够生成1.8 MW/m2热流密度的瞬态非线性热试验模拟环境;能将试验环境温度提高到1 500 ℃。在该热试验系统上完成了如下试验研究: 1）金属蜂窝板结构在高温950 ℃非线性热环境下的隔热性能评价试验和数值模拟;2）对SiC/SiC复合材料试件在1 300～1 500 ℃下的隔热性能评价试验;3）采用轴向非分段加热试验方式对圆柱型壳体结构（长2.1 m）内壁进行高温热环境试验。本试验系统在可控的非线性温升速率、高温高热流密度变化过程的动态模拟、热试验环境模拟的准确性以及非接触式全场高温变形测量等方面的研究成果达到了国际先进水平。