基于灰色马尔可夫链的航空货邮预测

结合航空货邮的特点和灰色预测及马尔可夫链理论的优点，提出航空货邮预测的灰色马尔可夫链模型。灰色马尔可夫链模型既考虑了从时间序列中挖掘数据的演变规律，又通过状态转移概率矩阵的变换，考虑数据的随机波动，它将时问序列数据固有的两种性质有机结合起来，具有严密的科学性，能较好地应用于中国航空货邮运输量的预测。     

Gamma rays from accreting matter onto collapsed objects

In the spherical accretion onto massive objects, the matter may be heated up to temperatures as high as 10¹² °K. In such a hot plasma, the thermal bremsstrahlung (e-e and e-p) and π° decay from inelastic collisions of protons are the main γ-ray sources. We determined the γ -ray production spectra from the π° decay and from bremsstrahlung for different temperatures. The expected γ-ray spectra were evaluated too in order to fit experimental data. We have fitted COS B data from 3C 273 using a two temperatures plasma model. The best fit is for

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(M₈ is the black hole mass in 10⁸ M) which gives . The hard X-ray measurements do not contradict the bremsstrahlung spectrum.     

通用航空发展与军民融合培养飞行人才

介绍我国军民融合培养飞行人才的历史脉络,研究我国通用航空的发展对飞行人才培养带来的影响,提出了借鉴外国空军经验、大力普及航空知识、不断改进飞行员培训机制和模式,以及建立科学的飞行军官服役退役制度等措施,以实现飞行人才资源能军民共享、良性互动.     

Robust and efficient computation of turbulent flows around civil transport aircraft at flight Reynolds numbers

This work aims at providing numerical methods that enable the robust and efficient simulation of turbulent flows around civil transport aircraft configurations at flight Reynolds numbers. Robustness problems related to the multigrid treatment of advanced transport equation turbulence models have been identified preventing convergence of simulations at high or flight Reynolds numbers. Therefore the application of multigrid to the turbulence equations is omitted while the multigrid treatment of the mean flow equations stays unchanged. Moreover, a fully implicit time integration scheme – a DDADI approach – is applied to the turbulence equations. The new approach raised robustness to a sufficient level to converge viscous computations at flight Reynolds numbers. Furthermore, the convergence speed of aerodynamic coefficients for three dimensional applications has also been improved significantly.     

ASAP: A systematic approach to plasma spectral synthesis

ASAP (Analysis System for Astrophysical Plasmas), developed at the Osservatorio Astronomico di Palermo, is a package of procedures based on IDL. It is aimed at the detailed presentation of theoretical models of astrophysical plasmas and the accurate comparison with observational data, up to fittings of specific observations. It is also useful for the prediction of specific observations, and for the simulation of the expected performances of forthcoming instruments, for instance those on board SOHO.     

基于灰色理论的飞行事故率和事故症候率预测

基于灰色预测理论,给出了飞行事故率和事故症候率预测分析的新方法。分析结果表明,采用灰色预测理论对飞行事故率和事故症候率进行预测分析,可以得到满意的预测精度,从而为民用航空器运营管理提供决策依据。     

基于灰混合策略的灰矩阵博弈模型的解

最大最小灰博弈值与灰混合策略的灰鞍点问题是基于灰混合策略的灰矩阵博弈的关键问题，本文运用灰色系统理论证明了最大最小灰博弈值定理，从而奠定了灰矩阵博弈的理论基础。在此基础上，提出了灰混合策略的灰鞍点的概念，并且证明了灰鞍点存在的充分必要条件和灰混合最优策略的可交换性定理。     

无穷观问题的研究（Ⅰ）—历史的回顾与思考

本组系列论文（Ⅰ）－（Ⅴ）从数学和认识论的角度系统地研究了无穷观问题的历史发展和现状，确立了无穷观背景世界的三分法原则，指出了两种无穷观相五排斥的局限性，形成了统一两种无穷于同一框架中的基本观点，并建立了一个统一实无限与潜无限于同一框架中的公理集体论系统APAS。     

多体链的动力学方程

 多刚体系统的动力学方程的建立,已经比较成熟。对于刚体与弹性体的混台多体系统,工作还较少。Likins和Hughes曾讨论过有太阳帆板的卫星的动力学方和。Hughes还讨论了两端各有一个刚体,中间皆为弹性体的多体链的动力学方程。本文应用虚功形式的d'Alembert原理建立任意多体链的动力学方程。     

基于Agent复杂低空飞行行为建模与仿真

为探索复杂低空混合飞行态势特性,采用Agent技术研究复杂低空飞行建模与仿真。从低空飞行环境分析入手,构建低空环境Agent、通用航空器Agent及内部推理结构,采用Netlogo平台开发复杂低空飞行态势仿真验证系统。仿真结果表明,飞行量与飞行冲突、平均间隔存在相关关系：随着飞行量不断增加,飞行冲突缓慢增加且波动较小,平均间隔呈递减趋势;但当飞行量达到一定程度,飞行冲突迅速增加且波动加剧,平均间隔趋于稳定,表明低空能力达到饱和。