挠性杆的镗加工技术

针对挠性杆的结构特点和加工难点,提出了有效的工艺措施,从装夹定位、刀具材料与几何参数选择、刃磨方法、切削用量的选择,以及挠性杆内应力的分析等方面详细地阐述了加工过程中的关键技术,解决了挠性杆镗削加工的技术难题。     

无人机载SAR一体化显控系统的设计研究

阐述了无人机载SAR一体化显控系统的设计,对系统实现中应用到的一些关键技术进行了详细说明,就多位面技术、多线程技术及内存映射技术进行了探讨。     

电磁超介质研究进展

电磁超介质是当前电磁学和物理研究领域中的前沿与热点，文章将左手材料、复合左／右手传输线、光子晶体统一在电磁超介质的体系下进行介绍，并论述了电磁超介质的发展现状。     

钛合金精密零件的活性屏离子渗氮

采用活性屏离子渗氮技术对钛合金进行渗氮处理,并将渗氮层的组织、形貌、维氏硬度和零件的变形情况与普通离子氮化的试件作对比。结果表明,活性屏离子氮化的组织和性能优于普通离子氮化,工件变形小、表面光洁度高、操作简单、过程可控、质量一致性好,可以解决钛合金精密零件普通离子氮化存在的问题。     

Using vegetation indices and texture measures to estimate vegetation fractional coverage (VFC) of planted and natural forests in Nanjing city,China

Vegetation fractional coverage (VFC) is an important vegetation parameter affecting exchanges of carbon, water, energy between the atmosphere and surface. In this study, the applicability of tonal and texture measures calculated using an IKONOS_2 image in retrieving VFC of forests was investigated in the urban area of Nanjing city, China. Four spectral vegetation indices (VI) and six texture measures (TEX) were related to VFCs acquired from in situ measurements. Models for estimating VFC based on VIs or/and TEXs were established and validated for planted low broad-leaf forest plots (PLB), planted mature forest plots (PMF), natural broad-leaf forest plots (NBF), and all forest plots (ALLv), respectively. The results show that high spatial resolution remote sensing data is applicable to estimate VFC in urban areas, and TEXs may act as effective supplements of vegetation indices (VIs) for the retrieval of VFC. VIs are suitable for VFC estimation of mature forests (such as NBF and PMF) with high vegetation density, and TEXs can yield a more accurate estimate for planted forests (such as PLB and PMF) with regular spatial distribution if they are calculated with proper parameters, such as window size. The combination of VIs and TEXs improve the estimation of VFC if forest types are not previously differentiated. The results can be used as a reference for determining effective spectral or texture parameters in VFC estimation under similar environmental conditions according to vegetation maturity and regularity.     

A data-driven health indicator extraction method for aircraft air conditioning system health monitoring

Prognostics and Health Management (PHM) has become a very important tool in modern commercial aircraft. Considering limited built-in sensing devices on the legacy aircraft model, one of the challenges for airborne system health monitoring is to find an appropriate health indicator that is highly related to the actual degradation state of the system. This paper proposed a novel health indicator extraction method based on the available sensor parameters for the health monitoring of Air Conditioning System (ACS) of a legacy commercial aircraft model. Firstly, a specific Airplane Condition Monitoring System (ACMS) report for ACS health monitoring is defined. Then a non-parametric modeling technique is adopted to calculate the health indicator based on the raw ACMS report data. The proposed method is validated on a single-aisle commercial aircraft widely used for short and medium-haul routes, using more than 6000 ACMS reports collected from a fleet of aircraft during one year. The case study result shows that the proposed health indicator can effectively characterize the degradation state of the ACS, which can provide valuable information for proactive maintenance plan in advance.     

NONLINEAR PREDICTIVE CONTROL FOR TERRAIN FOLLOWING

ＮＯＮＬＩＮＥＡＲＰＲＥＤＩＣＴＩＶＥＣＯＮＴＲＯＬＦＯＲＴＥＲＲＡＩＮＦＯＬＬＯＷＩＮＧＣｕｉＨｕｔａｏ（崔祜涛），ＧｅｎｇＹｕｎｈａｉ（耿云海），ＹａｎｇＤｉ（杨涤）（ＨａｒｂｉｎＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｌｏｇｙ，Ｐ．Ｏ．Ｂｏｘ１３７，...     

人工智能在电火花加工工艺知识库系统中的应用

]在分析电火花加工中工艺参数与加工性能之间关系的基本上，利用人工智能原理建立了电火花加工工艺知识库，并开发了相应的知识库系统，实现了电火花加工的工艺参数和加工性能之间的双向求解，     

固体超强酸TiO2/SO2-4催化合成苹果酯-B

使用TiO2/SO2-4为催化剂,催化乙酰乙酸乙酯和1,2-丙二醇反应合成苹果酯-B.结果表明:使用该催化剂1.0 g,乙酰乙酸乙酯(0.077 mol)与1,2-丙二醇摩尔比为1∶1.2,环己烷15 ml,反应2.5 h,苹果酯-B产率达73%.产品经理化检验确认.     

精确打击武器与精确制导技术

介绍了精确打击武器的基本分类以及不同的打击武器采用的不同的制导技术。分析了国外的精确打击武器中采用的制导技术，指出了精确打击武器及其制导技术是现代高科技武器发展的关键技术。