羽流光谱的原子辐射仿真

为对液体火箭发动机羽流光谱实验数据进行定量分析 ,通过建立高温气体下辐射传递模型 ,对1 Cr1 8Ni9Ti的理论光谱进行了仿真计算。结果表明 ,在路径一定的情况下 ,羽流中原子浓度较低时 ,可采用光学薄模型 ,原子浓度较高时 ,可采用光学厚模型     

Structural and collisional data for Mg III and Al IV

We present in this work energy levels, oscillator strengths, radiative decay rates and fine structure collision strengths for the Mg III and Al IV ions. The 11 configurations: (1s²) 2s²2p⁶, 2s²2p⁵3l, 2s2p⁶3l, 2s²2p⁵4l   (l?n-1$l?n-1$, where n is the principal quantum number), yielding the lowest 75 levels are used. The collisional data for these two ions are missing in the literature, especially the database CHIANTI, this is the principal motivation behind the present work. Calculations have been performed using the AUTOSTRUCTURE code. AUTOSTRUCTURE treats the scattering problem in the distorted wave approach. Fine structure collision strengths are calculated for a range of electron energies from 10 Ry to 240 Ry. The atomic structure data are compared to available experimental and theoretical results.     

喷气动力装置的红外辐射源及其抑制

本文分析喷气动力装置的红外辐射源,并讨论抑制红外辐射的技术途径.喷气动力装置的红外辐射来源于燃烧引起的高温,并可区分为两大类:固体表面的辐射和热喷流的辐射.一般而言,抑制红外辐射可从以下三个方面着手:(1)用冷却或绝热的方法降低辐射表面的温度,或通过蔽挡阻止红外辐射的传播;(2)加速喷气流与周围空气的混合,使喷流温度快速降低;(3)降低燃烧产物中辐射成分的浓度.     

复合材料层合板受低速冲击后的力学性能的实验研究

利用落锤装置，对玻纤／环氧和碳纤／环氧两种复合材料层合板进行了低速低能量的冲击实验研究。利用传感器技术记录了落锤冲击试样过程中的速度曲线，计算了冲击动能和材料损伤时的能量吸收，通过数学处理得到了冲击载荷和冲击点位移曲线。测量了层合板受冲击后的剩余弯曲强度和剩余弯曲弹性模量，得出了两种复合材料层合板的能量吸收门槛值。结果表明，碳纤／环氧的能量吸收门榄值比玻纤／环氧低，但是前者有较宽的能量吸收容限。和     

小型磁偏转质谱计性能实验研究

自主研发了小型磁偏转质谱计,并对其质量范围、分辨本领、灵敏度和最小可检分压力四个主要性能指标进行了实验测试和比对。结果表明,该质谱计的质量范围为（1~143）amu,相对N₂的分辨本领为1400,灵敏度为4.2×10^-5 A/Pa,最小可检分压力为9.5×10^-7 Pa。该测试和比对结果为磁偏转质谱计进一步的优化设计和性能提高奠定了重要基础。     

混杂纤维复合材料吸湿行为研究

 本文采用80℃水浸的方法,研究了不同类型混杂复合材料层压板的吸湿行为,找到描述混杂复合材料吸湿规律方程。同时,从理论上对混杂复合材料的平衡吸湿量及湿扩散系数进行了分析,建立了数学表达式,理论与实验较好吻合。     

嫦娥工程X射线谱仪的数据压缩研究

本文对嫦娥工程中的重要科学载荷X射线谱仪提出了一种有效的数据压缩方案。针对具体的数据特征,结合稀疏串编码、相关编码、前缀编码和字典编码等思想实现了无损和近无损压缩,使实验室理想环境下获得以及经嫦娥一号卫星下传的太阳能谱数据平均压缩比分别达到15和7,两种情况下的月球事例数据平均压缩比都为2,同时算法还具有一定的纠错能力,满足了X射线谱仪数据压缩的需求,为嫦娥三号卫星上粒子激发X射线谱仪的星载数据处理和后续工作提供了经验和准备。     

Full-scale crash test and FEM simulation of a crashworthy helicopter seat

Crashworthy seat structure with considerable energy absorption capacity is a key component for aircraft to improve its crashworthiness and occupant survivability in emergencies.According to Federal Aviation Administration(FAA) regulations,seat performance must be certified by dynamic crash test which is quite expensive and time-consuming.For this reason,numerical simulation is a more efficient and economical approach to provide the possibility to assess seat performances and predict occupant responses.A numerical simulation of the crashworthy seat structure was presented and the results were also compared with the full-scale crash test data.In the numerical simulation,a full-scale three-dimensional finite element model of the seat/occupant structure was developed using a nonlinear and explicit dynamic finite element code LS-DYNA3D.Emphasis of the numerical simulation was on predicting the dynamic response of seat/occupant system,including the occupant motion which may lead to injuries,the occupant acceleration-time histories,and the energy absorbing behavior of the energy absorbers.The agreement between the simulation and the physical test suggestes that the developed numerical simulation can be a feasible substitute for the dynamic crash test.      

A Satellite-borne Miniature Ion Mass Spectrometer for Space Plasma

The miniature design technology is an important trend in space exploration. Mass spectrometer is used extensively in the space environment detection. The miniature ion mass spectrometer utilizes a 127° cylindrical electrostatic analyzer accompanied with a Time of Flight (TOF) unit based on ultrathin carbon foil to measure the energy spectra and composition of space plasma. The Time of Flight technique has been used broadly in space plasma measurement. A new type of miniature method for the ion mass spectrometer is introduced. The total mass of the instrument is 1.8 kg and the total power consumption is 2.0W. The calibration results show that the energy measurement range is 8.71～43550eV, the energy resolution is 1.86% and the ion mass from 1 amu (1 amu = 1.67 × 10^-27 kg) to 58 amu can be resolved by the miniature mass spectrometer. The miniature ion mass spectrometer also has a potential to be increased in the field of view by an electrostatic deflecting system to extend its application in space plasma detection. The miniature ion mass spectrometer has been selected for pre-study of Chinese Strategic Priority Research Program on Space Science.     

生物组织光学参数：优化散射系数（μ’s）的实时在位测定

利用了一套特殊设计光纤探头组成的稳定态光纤光谱仪测试生物组织的光学参数，从悬乳液(Intralpid)与模拟胶(Phantom)实验推导出优化散射系数(Reduced scattering coeffcient：μ’s)近红外谱测量经验公式。测量反射系数就可以计算出优化散射系数谱。计算结果用模拟胶作了验证，并对大鼠脑组织μ’s进行了实时在位测量，从而得到了一种μ’s在位测量的有效方法。