The MELISSA pilot plant facility as as integration test-bed for advanced life support systems.

The different advances in the Micro Ecological Life Support System Alternative project (MELISSA), fostered and coordinated by the European Space Agency, as well as in other associated technologies, are integrated and demonstrated in the MELISSA Pilot Plant laboratory. During the first period of operation, the definition of the different compartments at an individual basis has been achieved, and the complete facility is being re-designed to face a new period of integration of all these compartments. The final objective is to demonstrate the potentiality of biological systems such as MELISSA as life support systems. The facility will also serve as a test bed to study the robustness and stability of the continuous operation of a complex biological system. This includes testing of the associated instrumentation and control for a safe operation, characterization of the chemical and microbial safety of the system, as well as tracking the genetic stability of the microbial strains used. The new period is envisaged as a contribution to the further development of more complete biological life support systems for long-term manned missions, that should be better defined from the knowledge to be gained from this integration phase. This contribution summarizes the current status of the Pilot Plant and the planned steps for the new period.     

新自由主义的社会福利思想

作为当代社会一个重要的理论范式，新自由主义是在与凯恩斯主义的论战中逐步发展起来的。在政治经济领域内，它拒绝国家的干预和控制；在社会福利领域内，它反对福利思想的传播和福利国家的构建，主张通过自由市场机制和个人的自我负责来取代长期由国家提供的社会福利，借以减轻国家的负担，激发个人的进取精神。在新自由主义思想的指引下，英国和美国分别实施了社会福利改革，短期内在减少社会福利开支的同时，也导致了社会福利水平的下降，从长期看，新自由主义的社会福利政策存在着缺陷。     

Cellular parameters for track structure modeling of radiation hazard in space.

Based on irradiation with 45 MeV/u N and B ions and with Co-60 gamma rays, cellular parameters of Katz's track structure model have been fitted for the survival of V79-379A Chinese hamster lung fibroblasts. Cellular parameters representing neoplastic transformations in C3H10T/1/2 cells after their irradiation with heavy ion beams, taken from earlier work, were also used to model the radiation hazard in deep space, following the system for evaluating, summing and reporting occupational exposures proposed in 1967 by a subcommittee of NCRP. We have performed model calculations of the number of transformations in surviving cells, after a given fluence of heavy charged particles of initial energy 500 MeV/u, penetrating thick layers of cells. We take the product of cell transformation and survival probabilities, calculated along the path lengths of charged particles using cellular survival and transformation parameters, to represent a quantity proportional to the "radiation risk factor" discussed in the NCRP document. The "synergistic" effect of simultaneous charged particle transfers is accounted for by the "track overlap" mode inherent in the model of Katz.     

载人航天器放电调节器稳定性研究

电源系统的稳定性是保证载人航天器在轨飞行可靠安全的要素之一。文章研究了应用混合型功率调节技术的电源系统放电调节器的建模方法,获得了系统开环传递函数,进行了仿真验证,在此基础上分析了影响放电调节器稳定性的因素,表明系统中存在过大的延迟会使系统的稳定性大幅降低甚至造成不稳定,地面试验结果验证了此结论的正确性。     

Hamilton正则方程半解析法的收敛和对称分析

近年来,Hamilton正则方程半解析法在工程问题上的应用越来越广泛,但至今未见有关这种方法收敛性和对称性问题研究的文献。基于Hamilton正则方程的半解析法理论,通过变分原理详细推导了Hamiltonian元素的固支和简支边界公式及对称边界公式。多个实例的数值研究表明：随着网格加密,Hamilton正则方程半解析法的收敛速度快于一般传统位移有限元法,对称解法的效率明显优于整体解法。     

Cosmic Ray Energetics And Mass for the International Space Station (ISS-CREAM)

The Cosmic Ray Energetics And Mass (CREAM) instrument is configured with a suite of particle detectors to measure TeV cosmic-ray elemental spectra from protons to iron nuclei over a wide energy range. The goal is to extend direct measurements of cosmic-ray composition to the highest energies practical, and thereby have enough overlap with ground based indirect measurements to answer questions on cosmic-ray origin, acceleration and propagation. The balloon-borne CREAM was flown successfully for about 161 days in six flights over Antarctica to measure elemental spectra of Z = 1–26 nuclei over the energy range 10¹⁰ to >10¹⁴ eV. Transforming the balloon instrument into ISS-CREAM involves identification and replacement of components that would be at risk in the International Space Station (ISS) environment, in addition to assessing safety and mission assurance concerns. The transformation process includes rigorous testing of components to reduce risks and increase survivability on the launch vehicle and operations on the ISS without negatively impacting the heritage of the successful CREAM design. The project status, including results from the ongoing analysis of existing data and, particularly, plans to increase the exposure factor by another order of magnitude utilizing the International Space Station are presented.     

基于云贝叶斯网络的运输飞机超轮速风险评估

起飞超轮速严重威胁飞行安全,为了有效评估运输飞机起飞时在不确定性因素影响下的超轮速风险水平,提出一种基于云模型和贝叶斯网络的评估模型。选取抬轮速度、总重、低压转子转速、抬轮率、抬轮时机、升降舵控制量、风的分量、总温8个指标,建立超轮速风险指标体系;运用基于启发式高斯云变换算法和正向高斯云算法的云模型,实现超轮速风险等级软划分和指标离散化,并确定各指标的先验概率;构建超轮速风险的贝叶斯网络,基于所建网络和节点信息计算节点后验概率,通过网络反向诊断得到超轮速的主要诱因。结合实际运行数据进行仿真验证,结果表明：评估结果符合实际情况,验证了模型的有效性。研究结果可为超轮速事件分析、民航运行安全风险管理提供理论依据。     

称重传感器的一种新的滞后补偿方法(英文)

通过对电阻应变式称重传感器在各种加载卸载情况下的滞后特性的分析 ,建立了其相应的数学模型 ,并初步探讨了一种可以通过程序在仪表中对传感器的重要指标—滞后进行补偿从而提高整个传感器的精度的方法。最后 ,对以上方法进行了验证性试验 ,证明了补偿方法的可行性。     

一种预估涡喷/涡扇发动机重量的方法

从发动机的热力循环参数出发,通过流路分析确定总体轮廓尺寸,进一步获得主要零件的几何尺寸,并以此为依据估算发动机重量。