The Radio Observatory on the Lunar Surface for Solar studies

The Radio Observatory on the Lunar Surface for Solar studies (ROLSS) is a concept for a near-side low radio frequency imaging interferometric array designed to study particle acceleration at the Sun and in the inner heliosphere. The prime science mission is to image the radio emission generated by Type II and III solar radio burst processes with the aim of determining the sites at and mechanisms by which the radiating particles are accelerated. Specific questions to be addressed include the following: (1) Isolating the sites of electron acceleration responsible for Type II and III solar radio bursts during coronal mass ejections (CMEs); and (2) Determining if and the mechanism(s) by which multiple, successive CMEs produce unusually efficient particle acceleration and intense radio emission. Secondary science goals include constraining the density of the lunar ionosphere by searching for a low radio frequency cutoff to solar radio emission and constraining the low energy electron population in astrophysical sources. Key design requirements on ROLSS include the operational frequency and angular resolution. The electron densities in the solar corona and inner heliosphere are such that the relevant emission occurs at frequencies below 10 MHz. Second, resolving the potential sites of particle acceleration requires an instrument with an angular resolution of at least 2°, equivalent to a linear array size of approximately 1000 m. Operations would consist of data acquisition during the lunar day, with regular data downlinks. No operations would occur during lunar night.     

CAARC高层建筑标模动态测力研究

CAARC高层建筑标模的动态测力试验在南京航空航天大学NH－2低速风洞中进行，在均匀流场中以及模拟大气边界层中分别测量了模型的动态气动力和力矩的平均值，均方根值，峰值，试验目的是为检测NH－2风洞的大气层边界模拟技术，动态天平，测试仪器以及动态数据采集和处理系统，试验结果表明，CAARC标模的所有动态气动特性在NH－2中的测量值与国外部报导的结果符合得较好，因此，NH－2风洞的大气边界层模拟技术，动态天平，测试仪器以及动态数据采集与处理系统可以承担高层建筑方面动态测力试验任务。     

Effects of Atomic Oxygen Irradiation on Transparent Conductive Oxide Thin Films

作为一种功能薄膜,透明导电氧化物(TCO)薄膜在飞行器的抗原子氧(AO)涂层和太阳能电池领域有着巨大的应用价值。ZnO:Al(ZAO)和In2O3:Sn(ITO)薄膜是目前研究和应用最广泛的TCO。本文对ITO薄膜和ZAO薄膜进行了不同通量的AO辐照。通过对辐照前后样品的X射线衍射、扫描电镜及霍耳效应的表征及测试,研究了AO辐照对这两种TCO薄膜的结构、性能及电学特性的影响。研究表明AO辐照对ZAO薄膜表面有明显的侵蚀作用,但对其结构和导电性能没有明显影响。对于ITO薄膜,随着AO通量的增大,其载流子浓度逐渐下降从而导致了电阻率的提高,电阻率的最大变化达到了21.7%。     

地球反照对数字太阳敏感器的影响分析

地球反照对太阳敏感器性能有重要影响,同时也制约着太阳敏感器在卫星上的安装。由于数字太敏感器本身独特的结构模型,所以需要采取有针对性的方法对其进行影响分析。本文在此模型基础上提出了利用图像技术的地球反照影响分析方法,为太阳敏感器在航天器上的应用与安装提供了技术支持。     

海南万宁大气腐蚀环境特点的研究

通过利用大气腐蚀监测仪(ACM)对海南万宁地区的大气腐蚀进行长期电化学监测的结果,与该地区同期的主要大气腐蚀环境因素对比分析,初步找出海南万宁大气腐蚀的主要环境因子及其腐蚀环境特点.海南万宁长期处于高温高湿条件下,大气腐蚀处于连续不断过程之中,但这一地区大气污染少,加速因素较小,因而大气腐蚀不严重.     

质子耀斑活动区的再现规律

质子耀斑活动区再现规律的研究结果表明，日面上存在着经度方向漂移式的“活火山”，即质子活动复活体，“活火山”定期地复活，并爆发质子耀斑。其复活长周期为８－１１．６年，与活动周１１年周期基本一致；短周期为１．２６年，与活动周峰年时间宽度一致。在２２周峰年中，日面南北半球上各有一个强质子活动复活体，它们爆发值流量≥１００ｐｆｕ和≥１０００ｐｆｕ的质子耀斑各占周期同类耀斑总数的７０．７％和８３．３％。     

基于虚拟维修过程的产品平均修复时间预计

针对基于同一个虚拟仿真过程,同步开展维修定性,定量分析工程需求,建立了基于虚拟维修过程的产品平均修复时间预计方法,详细阐述了维修活动层次化分解、时间层次模型、基本计算模型。结合某型飞机维修性分析工作开展,采用目前航空工业部门广泛应用的 Delmia 虚拟维修仿真软件,进行了工程实例应用,实践结果表明,建立的模型和方法是适用的、合理的、可行的。     

First solar observations with ALMA

The Atacama Large Millimeter-Submillimeter Array (ALMA) has opened a new window for studying the Sun via high-resolution high-sensitivity imaging at millimeter wavelengths. In this contribution I review the capabilities of the instrument for solar observing and describe the extensive effort taken to bring the possibility of solar observing with ALMA to the scientific community. The first solar ALMA observations were carried out during 2014 and 2015 in two ALMA bands, Band 3 ($\lambda =3$?mm) and Band 6 ($\lambda =1.3$?mm), in single-dish and interferometric modes, using single pointing and mosaicing observing techniques, with spatial resolution up to $～$2″ and $～$1″ in the two bands, respectively. I overview several recently published studies which made use of the first solar ALMA observations, describe current status of solar observing with ALMA and briefly discuss the future capabilities of the instrument.     

航天器空间环境干扰力矩分析与仿真研究

针对航天器在轨运行时所受到的空间环境干扰力矩进行建模分析,并通过实时解算和矢量叠加的方式进行仿真研究,尤其对太阳光压力矩与大气阻力力矩的建模与仿真提出了新的方法,该方法通过建立光照面与迎风面的判断准则,准确地对太阳光压力矩与大气阻力力矩进行了估计。对各种空间环境干扰力矩的精确建模与仿真为航天器精确姿态控制设计及系统姿态控制方案和控制执行机构的选取提供了依据,文中提出的方法简单易用,工程实现性强,为未来的工程应用提供了一定的理论依据。     

Quasi-biennial oscillations in the cross-correlation of properties of macrospicules

Jets, whatever small (e.g. spicules) or large (e.g. macrospicules) their size, may play a key role in momentum and energy transport from photosphere to chromosphere and at least to the low corona. Here, we investigate the properties of abundant, large-scale dynamic jets observable in the solar atmosphere: the macrospicules (MS). These jets are observationally more distinct phenomena than their little, and perhaps more ubiquitous, cousins, the spicules. Investigation of long-term variation of the properties of macrospicules may help to a better understanding of their underlying physics of generation and role in coronal heating. Taking advantage of the high temporal and spatial resolution of the Solar Dynamics Observatory, a new dataset, with several hundreds of macrospicules, was constructed encompassing a period of observations over six years. Here, we analyse the measured properties and relations between these properties of macrospicules as function of time during the observed time interval. We found that cross-correlations of several of these macrospicule properties display a strong oscillatory pattern. Next, wavelet analysis is used to provide more detailed information about the temporal behaviour of the various properties of MS. For coronal hole macrospicules, a significant peak is found at around 2-year period. This peak also exists partially or is shifted to longer period, in the case of quiet Sun macrospicules. These observed findings may be rooted in the underlying mechanism generating the solar magnetic field, i.e. the global solar dynamo.