基于多元方差分析的一种雷达精度检飞数据处理方法

为了更深入的分析雷达精度检飞数据,更科学的评估雷达的战术性能,本文提出采用单因素多元方差分析方法来处理雷达精度检飞数据。以探测距离为影响雷达探测精度的主因素,建立多元方差分析模型。比较三部雷达的测量误差离差阵的仿真结果表明,离差阵可以全面反应雷达探测精度性能。该数据处理方法不但能够得到等效于传统处理方法的结果,而且能够进一步分析探测距离对雷达探测精度的影响程度。     

基于模糊逻辑的嵌入式飞机大气数据传感器测量位置优化设计

嵌入式飞机大气数据系统与传统的探头式系统相比,在气动、隐身和总体布局等方面具有明显优势。为了提高系统的探测准确度,需要对系统中的传感器测量位置进行优化设计。中以模糊逻辑为理论基础,结合大气数据的基本探测原理,设计了用于对嵌入式大气数据系统中传感器测量位置进行优化设计的方法。通过算例分析,验证了优化方法的合理性。最后,简要概述了该优化设计方法的研究结论。     

并行像散共焦序列图片的物点正焦信息萃取

并行像散共焦系统是基于共焦探测原理实现微结构的三维形貌测量。采用微透镜阵列进行光束分割,实现并行探测。引入像散原理减小光学系统中的干扰和波动对探测特性的影响。通过萃取图片序列中各个并行物点探测曲线的“零”点,实现物点正焦位置辨识。阐述了基于序列图片萃取物点探测曲线“零”点过程中涉及的图片序列中并行光场的定位与分割策略、差动光能统计算法的优化与实现、物点探测曲线轴向有效区域裁定及其特性拟合等关键问题。据此开发的软件“微结构探测系统”能够快速可靠地实现全场物点正焦信息萃取,为微结构形貌的精确三维建模及可视化测量奠定了基础。     

大气温室气体探测激光雷达及其标定技术研究进展

大气温室气体探测激光雷达是温室气体远程探测的重要手段,其探测技术和标定方法成为了各国温室气体探测的研究重点。综述了大气温室气体探测激光雷达技术及其标定方法的发展及应用,并对未来大气探测激光雷达的发展方向进行了展望。     

激光稳频技术在大气探测激光雷达中的应用研究进展

大气探测激光雷达因其时空分辨率高、探测精度高等特点,在大气探测、环境监测、国防安全等研究领域应用广泛。根据大气探测激光雷达的测量原理,其光源的频率稳定性会对大气参数的测量和反演产生巨大影响,因此,对光源进行稳频尤为重要。综述了目前应用于大气探测激光雷达的4种激光稳频技术及特点,介绍了这些稳频技术在大气探测激光雷达中的应用研究现状,为未来研制高精度大气探测激光雷达提供参考和借鉴。     

新型超光谱大气CO2遥感探测技术

论述了空间外差光谱技术在大气CO2超光谱遥感探测中的应用。分析了高精度大气CO2遥感探测所需的光谱波段、光谱分辨率以及信噪比等重要指标,以此为设计依据,开展了大气CO2空间外差光谱仪核心元器件指标的计算。利用 Y-12飞机进行航空验证实验,分别采集了农田、工业区、沙滩区域的 CO2吸收光谱数据,并开展了数据处理,获取了机载平台下的CO2精细吸收谱线。初步的反演结果表明空间外差光谱技术能够满足大气CO2等温室气体的遥感探测灵敏度要求。     

当前大气探测技术及其发展趋势分析

20世纪大气科学取得迅速的发展,其原因之一是重视观测系统的建设和新探测技术的应用。大气探测是大气科学的重要研究领域之一,本文在理清大气探测技术的基本发展历程的基础上,分析论述当前大气探测技术的现状,并对大气探测技术的未来发展趋势进行了展望。     

球载离子质谱计的研究

在中层大气的探测研究中,离子质谱术起着重要的作用。它不仅能获得有关大气中自然离子的数据,而且从所测离子成分能推算出部分中性痕量气体。球载离子质谱计用来研究平流层大气离子成分的特性和含量。本文主要论述所研制球载离子质谱计的测试方法、技术性能和初步实验结果。     

基于APEX方法的湍流退化图像复原算法

在目标探测过程中,为了消除大气湍流带来的影响,提出了一种基于APEX方法的盲去卷积图像复原算法.该算法是一种非迭代的盲图像复原算法,以湍流退化系统具有G类点扩展函数为假设前提,通过模糊图像的频谱信息直接估计点扩展函数,并采用SECB方法实现目标图像的重建.本文对该算法的原理及其对湍流退化图像复原的可行性进行了深入研究,进行了真实的湍流退化图像的复原实验,其结果表明,该算法能够快速实现对湍流退化图像的重建,并具有一定的稳定性,能满足目标探测过程中的实时性要求.     

浅谈如何提高高空气象探测施放高度

高空气象探测是大气探测的重要组成部分。是为数值预报提供更多的精确数据的基础。由于内蒙古属于内陆干旱半干旱气候,高空资料极为重要。所以施放高度的高低直接影响高空气象探测资料获取的全面性。以下是作者在多年工作中总结出的经验。根据内蒙古的情况,选择适合本地的净举力：对球皮进行精心保养：根据不同天气选择不同的净举力：是提高探测高度的关键。     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Mechanism Study on the Wear of CrAlTiN Coated High-Speed Steel Twist Drills Under Dry Cutting Conditions

As demands about environment protection are growing up, dry cutting technology is getting more and more concerns from all over the world. Main works performed here are study on dry cutting performances and wear mechanisms of M2high-speed steel (HSS) twist drills with CrAlTiN multicomponent coatings, which was deposited using magnetron sputter ion plating system, in drilling 45 and 30CrMnSiA steel, and their comparisons to those in drilling the same steel but using monolayer CrN and commercial TiN coated drills. Drilling performances of drills are evaluated mainly through the measurements of width on outer corner flank land and the cutting forces. Results show that performances of CrAlTiN coated drills are better than those of monolayer CrN and TiN coated drills. In drilling 45 and 30CrMnSiA steel, the average tool life of the CrAlTiN coated drills are 17.2 and 11.8 times higher than those of the uncoated drills. Observing wear of the drill with scanning electronic microscope, results show that there is no crack or spallation of the CrAlTiN coatings in wear zones. Main mechanism of the wear here is adhesion.     

Study on Bond Ability of Arc-Spraying Coatings with Different Surface Pretreatment on Cast-Iron

Arc spraying coatings are widely used in various applications, but uncommon in cast iron substrate. Different surface pretreatment technology is tested on substrates of gray cast iron. Surface roughness and residual stress were measured by TR200 and X-ray diffraction analyzer. Influence of different surface pretreatment methods ( dry blasting and fusebond) on roughness and residual stress was analyzed. The arc-sprayed coatings of wire 3Cr13 (φ2mm) on gray cast iron substrate is studied. The microstructure and interface of bonding layer were observed by SEM. The bond strength was taken by tensile test. Results show that bond strength with grit blasting is higher than fuse-bond; it is feasible to make wire 3Cr13 coating with arc spraying on cast iron substrate roughened by grit blasting.     

Structural Characteristics of TiO2 Ceramic Coating by Micro-Plasma Oxidation

TiO2 ceramic coatings with thickness of 20 μm were formed on the surface of pure titanium by micro-plasma oxidation. Their micro-structures were investigated by by using X-ray diffraction and their surface images were detected by using scan electronic microscope. There were three kinds of TiO2 coatings, pure anatase type TiO2 phase, mixed phases consisted of rutile type TiO2 phase and anatase type TiO2 phase, pure rutile type TiO2 phase. The coating surface with the pure anatase type TiO2 phase is rough, while the coating surface with the pure rutile type TiO2phase is smooth. The upper coating surface with the mixed type TiO2 phases is anatase type TiO2 structure and the subsurface of the TiO2 coating is rutile type TiO2structure.     

Evaluation of fatigue life of steel using steel grain size

The insightful discussion of the relationship between the construction of metallographic and fatigue life and proposition of mathematical relationships describing this relationship was conducted in the paper. This paper presents a method for estimating the fatigue life, based on the construction of the microstructural material taking into account the grain size and the participation of ferrite and pearlite phase.