等离子鞘套热力学波动对电磁波传播的影响

针对等离子鞘套热力学波动造成电磁波传播特性变化的问题，结合湍流理论、等离子理论和电磁波传播理论，得到了热力学参数波动与介电常数间的关系。计算了不同状态下热力学参数波动引起S和Ka波段电磁波透射和反射系数的变化。结果表明，当电子密度增大，S波段反射系数变化减小、透射系数变化增大；当Ka波段在碰撞频率10MHz时，反射系数变化增大、透射系数变化减小，在碰撞频率1GHz和50GHz时透射系数变化反射系数变化先增后减。不同高度下波动的影响也不同，S波段透射和反射系数变化随高度升高先减后增；Ka波段透射系数变化先减后增、反射系数变化先减后增而后再次减小。因此，应根据实际环境状态获得波动的包络范围，进而针对性开展测控通信系统设计。     

Genetic differentiation induced by spaceflight treatment of Cistanche deserticola and identification of inter-simple sequence repeat markers associated with its medicinal constituent contents

The dried, fleshy stems of Cistanche deserticola (Orobanchaceae) are popular tonics in Traditional Chinese Medicine (TCM) to treat the inability of kidney in expelling extra fluid in the body, causing fluid retention, and reform reproductive system. However, the wild plants of C. deserticola have become endangered due to habitat downsizing and over-harvesting for its medicinal usages. The present research was carried out for the following purposes: (1) promoting the space-breeding research; (2) providing molecular evidence for agricultural selective breeding; and (3) protecting this endangered herbal medicine and conserving its genetic resources.     

我国高原机场运行的地面及空勤特殊保障

位于我国西部高原的机场,一般净空条件极差、气候复杂多变。高原航线地形复杂,航路安全高度高,航路的运行安全问题尤为突出。针对中国西部高原复杂机场及航线的特点,对飞机性能、特殊飞行操作、适航改装、机务维修进行分析及论述,对规范高原航线运行合格审定提出一些建议。     

基于LabVIEW的超精密磨床嵌入式监控系统

针对超精密磨削机床的监控需求,基于NI–sbRIO硬件平台开发了一套应用于超精密磨床状态监测和数据采集的嵌入式监控系统,使用FPGA对温度、振动、声发射等信息进行实时数据采集,并使用实时处理器对数据进行分析和处理,实现对机床的实时状态监测和数据存储。通过FPGA编程取代硬件数据采集卡,成本低,灵活性强。试验表明,该系统能够胜任超精密磨床的监控任务。     

试飞试用阶段的飞机可靠性评估研究

飞机的可靠性水平是飞机设计定型时考核的重要指标之一,为保证评估结果的客观与准确性,在飞机 试飞试用阶段开展可靠性评估研究尤为重要。本文从工程实际需求出发,通过规范评估对象故障信息的采集 方式,明确故障判定准则与统计原则,给出完整的飞机可靠性评估流程;基于上述流程,针对某型飞机一年中的 试飞试用信息,进行多维度的可靠性评估。结果表明:评估结果能够较好地反映飞机的可靠性水平,满足工程 需要。     

某型教练机起落架信号电路改进设计

针对某型教练机存外场使用时出现起落架未放到位，而飞行员却没能及时发现的问题，本文对飞机起落架信号电路进行了分析，并提出了相应的改进措施。     

DELMIA在某民机前货舱门装配仿真中的应用

在现代自动化作业系统中,操作和管理的大多是一些复杂系统和各种数字化设备,这对操作人员观察周围环境和完成精准操作任务的要求很高。通过人机工程技术分析,可以对这些复杂、易错的任务逐个分析,合理分配注意力、安排操作顺序,既减轻操作人员的工作负荷又避免出错,切实提高人机工效。     

A straw-soil co-composting and evaluation for plant substrate in BLSS

Material closure is important for the establishment of Bioregenerative Life Support System, and many studies have focused on transforming candidate plant residues into plant culture medium. For the limitations of using wheat straw compost as substrate for plant cultivation, a straw-soil co-composting technique was studied. The changes of pH, C/N value, germination index, cellulose, lignin and so on were monitored during the co-composting process. The maturity was evaluated by the C/N value and the germination index. The result showed that after 45 days’ fermentation, the straw-soil final co-compost with inoculation (T1) became mature, while the co-compost without inoculation (T0) was not mature. In the plant culture test, the T1 substrate could satisfy the needs for lettuce’s growth, and the edible biomass yield of lettuce averaged 74.42 g pot⁻¹ at harvest. But the lettuces in T0 substrate showed stress symptoms and have not completed the growth cycle. Moreover, the results of nitrogen (N) transformation experiment showed that about 10.0% and 3.1% N were lost during the T1 co-composting and plant cultivation, respectively, 23.5% N was absorbed by lettuce, and 63.4% N remained in the T1 substrate after cultivation.     

运用GPS空中校正飞机无线电罗差误差分析

针对某些特种飞机无线电罗差无法沿用传统校正方法在地面进行校正的状况 ,首次提出了运用 GPS接收机在空中校正飞机无线电罗差的方法。本文对影响该校正方法校正精度的各项误差因素进行了分析。     

Dynamic characteristics analysis of deployable space structures considering joint clearance

The clearance in joints influences the dynamic stability and the performance of deployable space structures (DSS). A virtual experimental modal analysis (VEMA) method is proposed to deal with the effects of joint clearance and link flexibility on the dynamic characteristics of the DSS in this paper. The focus is on the finite element modeling of the clearance joint, VEMA and the modal parameters identification of the DSS. The finite element models (FEM) of the clearance joint and the deployable structure are established in ANSYS. The transient dynamic analysis is conducted to provide the time history data of excitation and response for the VEMA. The fast Fourier transform (FFT) technique is used to transform the data from time domain to frequency domain. The frequency response function is calculated to identify the modal parameters of the deployable structure. Experimental verification is provided to indicate the VEMA method is both a cost and time efficient approach to obtain the dynamic characteristics of the DSS. Finally, we analyze the effects of clearance size and gravity on the dynamic characteristics of the DSS. The analysis results indicate that the joint clearance and gravity strongly influence the dynamic characteristics of the DSS.