陕西城镇居民消费结构的ELES模型分析

以2005年陕西城镇居民消费支出的截面数据为样本,运用扩展线性支出系统对陕西城镇家庭的基本支出、边际消费倾向、需求收入弹性、需求价格弹性、消费结构的变化趋势进行了实证分析。分析显示,不同收入层次家庭的消费水平、消费类别存在明显差异,居民消费结构呈现多层次的新特点。     

Low light intensity effects on the growth,photosynthetic characteristics,antioxidant capacity,yield and quality of wheat (Triticum aestivum L.) at different growth stages in BLSS

Minimizing energy consumption and maximizing crop productivity are major challenges to growing plants in Bioregenerative Life Support System (BLSS) for future long-term space mission. As a primary source of energy, light is one of the most important environmental factors for plant growth. The purpose of this study is to investigate the effects of low light intensity at different stages on growth, pigment composition, photosynthetic efficiency, biological production and antioxidant defence systems of wheat (Triticum aestivum L.) cultivars during ontogenesis. Experiments were divided into 3 intensity-controlled stages according to growth period (a total of 65 days): seedling stage (first 20 days), heading and flowering stage (middle 30 days) and grain filling stage (last 15 days). Initial light condition of the control was 420 μmol m⁻² s⁻¹ and the light intensity increased with the growth of wheat plants. The light intensities of group I and II at the first stage and the last stage were adjusted to the half level of the control respectively. For group III, the first and the last stage were both adjusted to half level of the control. During the middle 30 days, all treatments were kept the same intensity. The results indicated that low-light treatment at seedling stage, biomass, nutritional contents, components of inedible biomass and healthy index (including peroxidase (POD) activity, malondialdehyde (MDA) and proline content) of wheat plants have no significant difference to the control. Furthermore, unit kilojoule yield of group I reached 0.591 × 10⁻³ g/kJ and induced the highest energy efficiency. However, low-light treatment at grain filling stage affected the final production significantly.     

人工智能在OODA 循环中的应用

当前人工智能(AI) 是商业和工业，甚至军事应用领域中最热门的流行语。军事国防领域也已经将人 工智能发展成为了一种技术，并应用到军事作战和决策系统中。最初OODA 循环是最知名的空战战术模型， 后来发展成为各国空军的作战方法。OODA 循环对于任务的定义和决策过程的理解起到了重要的作用。本文主 要研究了人工智能在OODA 循环决策中的应用。讨论了未来OODA 循环各阶段中所需的AI 作用和技术，包 括可解释的人工智能和基于学习的人工智能。     

ATC3000航空地图制作软件及其关键技术分析

针对ATC3000空管自动化系统的运行要求以及飞行管制区现场实际工作的需要,介绍了ATC3000航空地图制作软件的关键技术。文中分析了该软件的结构以及在Windows系统中使用Delphi开发的具体实现技术。     

基于RISC芯片的32位嵌入式基本系统的设计和调试

基于ＲＩＳＣ芯片的３２位嵌入式基本系统的研究和设计是当前嵌入式星载计算机研制方面的一个重要课题，着重介绍了该ＲＩＳＣ基本系统的设计特点以及所使用的构思新颖的调试方法等两方面的研究情况。     

光电经纬仪室内检测系统的研究与应用

为解决靶场光电经纬仪的精度检测问题,进行可行性分析和系统研究,研制开发室内检测系统。系统针对靶场不同型号的光电经纬仪提出合理的检测方法,建立动态精度靶标为检测基础的数学模型,用Visual Basic实现数据转换、计算和检测信息管理,并通过某型号光电经纬仪实际检测、验证系统的正确性。该检测系统增强了检测的可靠性,极大地提高检测效率。     

Short-Lived Radionuclides in Meteorites: Constraints on Nebular Timescales for the Production of Solids

Variations in the abundances of short-lived radionuclides such as ²⁶Al (τ_1/2 ≈ 0.74 Ma) and ⁵³Mn (τ_1/2 ≈ 3.7 Ma) in meteoritic solids may be used to infer relative formation intervals of these solids in the nebula at precisions of less than 1 Ma. In a strict chronometric interpretation of the isotopic variations, whereby criteria such as spatial and temporal isotopic homogeneity and closed system isotopic evolution are met, solid formation occurred in the nebula for at least several million years. This is longer than some theoretical and astronomical estimates for the duration of the active nebula. The evidence for live ⁴¹Ca (τ_1/2 ≈ 0.10 Ma) in meteoritic inclusions further indicates that the onset of solid formation occurred quite early, perhaps within a few hundred thousand years after the onset of the collapse of the sun's parent molecular cloud. Failure of the chronometric interpretation may arise for a variety of reasons, including but not limited to, the late, inhomogeneous injection of material from a nearby stellar source or the local production of short-lived radionuclides by an energetic particle irradiation, e. g., from T Tauri (X-wind) or galactic cosmic ray sources. Although some isotopic evidence exists that the criteria required for a strict chronometric interpretation are not met by each of the short-lived chronometers, there is no compelling reason to shorten the interval of solid formation in the nebula to less than 1 Ma. This revised version was published online in June 2006 with corrections to the Cover Date.     

基于积分投影的去除噪声算法用于人脸图像处理

本文提出了一种解决滤除人脸图像中高频及低频噪声的新算法。首先可对原始人脸图像进行边界提取，并使之成为二值图；然后，分别采用水平及垂直积分投影的方法，在低频与高频噪声中确定人脸轮廓；在此基础上，消除轮廓以外的噪声。     

对《共产党宣言》中"两个彻底决裂"思想的几点认识

从学术界关于《共产党宣言》中“两个彻底决裂”思想的讨论出发，提出对“两个彻底决裂”的正确认识和理解不能纠缠于翻译技巧的问题，应该从《共产党宣言》表述的整体思想体系及本质去理解和把握。要正确认识“两个彻底决裂”的思想提出的背景、内涵及其辨证关系，正确理解实现“两个彻底决裂”的长期性、复杂性和条件性。     

Fronts and thermohaline structure of the Brazil–Malvinas Confluence System

Fronts and thermohaline structure of the Brazil–Malvinas Confluence System (BMCS) are studied from climatic data, “Marathon Exp. Leg.8, 1984” data, and Sea surface temperature (SST) data base “ds277-Reynolds” (1981–2000). The South Atlantic Central Water (SACW) is divided in two main types: tropical (TW) and subtropical water (ST). Water masses, Fronts, Inter-Frontal and Frontal Zones are analysed and classified: (a) the water masses: Tropical Low-Salinity Water, Tropical Surface Water, Tropical Tropospheric Water, Subtropical Low-Salinity Water, Subtropical Surface Water, Subtropical Tropospheric Water. T,S characteristics of intermediate, deep and bottom water defined by different authors are confirmed and completed; (b) the Inter-Frontal Zones: Tropical/Brazil Current Zone, Subtropical Zone and Subantarctic Zone; (c) the Frontal Zones: Subtropical, Subantarctic and Polar, and (d) the Fronts: Subtropical Front of the Brazil Current, Principal Subtropical Front, North Subtropical Front, Subtropical Surface Front, South Subtropical Front, Subantarctic Surface Front, Subantarctic Front and Polar Front. Several stable T–S relationships are found below the friction layer and at the Fronts. The maximum gradient of the oceanographic characteristics occurs at the Brazil Current Front, which can be any of the subtropical Fronts, depending on season. Minimum mean depth of the pycnocline coincides with the Fronts of the BMCS, indicating the paths of low-salinity shelf waters into the open ocean. In the work it is shown how to recover the horizontal and vertical thermohaline structure of waters from satellite data RSMAS SST.