面向三江保护区植被类型识别的最佳波段组合研究

目的 针对高分六号影像数据面向植被类型、特别是湿地植被信息识别的最佳波段组合进行研究,为高分六号数据在湿地资源监测中的进一步应用提供参考。 方法 以三江国家级自然保护区为对象,基于高分六号影像数据,结合当地植被特点,开展保护区植被类型识别中的最佳波段组合研究。从影像信息特征、最佳指数因子以及光谱特征曲线和地物可分性角度进行综合分析,获取基于GF6/WFV数据的三江保护区植被类型识别的最佳波段组合。同时,通过对比实验,利用支持向量机分类方法,对样区的植被类型进行信息提取,证实了结果的可靠性。 结果 波段组合4（R）-5（G）-1（B）识别植被类型精度最高。总体精度为89.15%,Kappa系数为0.8463。 结论 波段组合4（R）-5（G）-1（B）为三江保护区植被类型识别的最佳波段组合。本研究可为东北地区湿地保护区的退耕还湿工程监测提供参考。     

基于BMV特征的西瓜成熟度无损检测方法

针对西瓜成熟度无损测定的难度较大这一问题,提出了一种基于音频响应频带幅值向量（BMV）特征的西瓜成熟度无损检测方法。搭建了一套简单的音频采集平台,检验了BMV音频特征与西瓜成熟度的相关性,并与4种已用于西瓜无损检测的音频特征进行了比较;测定了不同打击力度对音频响应和BMV的影响;使用PNN算法对2个品种西瓜的BMV样本进行了成熟度检测。试验结果表明：经过音频特征间的比较,BMV与西瓜成熟度相关性最高,并且打击力度对特征的影响较小,整套算法对2个品种的成熟度检测准确度较高。     

基于GF-6卫星影像多特征优选的酿酒葡萄精准识别

多源遥感信息和特征优选是提高农作物识别精度的重要支撑,高分六号(GF-6)卫星作为首次引入红边波段的国产卫星,其丰富的光谱信息为作物识别提供了新的思路和解决途径。该研究基于宁夏回族自治区银川市永宁县2018年6月—2019年3月的GF-6数据,充分利用红边优势提取光谱特征、纹理特征和植被指数特征,构建多种特征组合方案,并根据随机森林算法对特征重要性进行度量,选取最优特征组合对酿酒葡萄进行精准识别。结果表明,与单一特征相比,多源遥感特征的增加显著改善了酿酒葡萄分类效果,其中,植被指数贡献程度最大,光谱特征次之;基于随机森林的优选特征组合分类效果最佳,其中,总体分类精度为94.15%,酿酒葡萄用户精度为94.23%,制图精度为92.59%;以实地调查的4个酒庄为验证区,将酿酒葡萄提取结果与统计数据进行对比,面积相对精度均在70%以上,其中优选特征结果相对精度在90%以上,研究结果将为国产卫星红边波段在植被分类和识别方面的应用提供数据参考。     

The Effect of Lunging with Three Aids on the Thermographically Determined Temperatures of the Distal Portion of Horse Limbs

The regulation of head and neck position during physical exercise may be obtained using lunging aids (LAs): Chambon (CH), rubber band (RB), or triangle side reins (TR). The use of LAs would shift the center of horse mass caudally, thereby change the limb load. The aim is to evaluate the pattern of superficial temperatures (PST) of hoof wall (HW), the coronary band (CB), and the dorsal aspect of the fetlock joint (FJ) obtained before and after lunging with LAs and freely moving head (FMH). Sixteen horses were imaged using an infrared camera. The temperatures of HW, CB, and FJ were measured, and differences between images obtained before and after lunging were evaluated. The correlations between HW, CB, and FJ were then described using respective coefficients (r, rho). Before lunging PST was similar (P < .05) in FMH, CH, RB, and TR, with the strong positive correlations for forelimbs (HW/CB:rho = 0.9022; HW/FJ:rho = 0.7064; CB/FJ:rho = 0.8010) and hindlimbs (HW/CB:rho = 0.7287; HW/FJ:r = 0.7831; CB/FJ:r = 0.7233). After lunging, PST and correlations changed (P > .05) depending on LAs application. No correlations for FMH and CH, and positive correlations for RB and TR were noted: HW/CB for forelimbs (RB:r = 0.6813; TR:r = 0.8396), CB/FJ for hindlimbs (RB:r = 0.5621; TR:rho = 0.4579). The PST of the distal portion of limbs and relations between measured temperatures change depending on used LAs.     

高分子量和中分子量蛋白质谱带与普通小麦馒头加工体积的关系

本文利用Ｎｇ，Ｐ．Ｋ．Ｗ．Ｂｕｓｈｕｋ，Ｗ．（１９８７）的方法，对３３个小麦品种的高分子量（ＨＭＷ）和中分子量（ＭＭＷ）蛋白质谱带的组成进行了测定，经简单相关和逐步回归分析，找出了各谱带与馒头加工体积的关系，筛选出了ｘ２、ｘ１０、ｘ１４、ｘ１８４条对馒头加工体积影响较大的谱带，其分子量分别为１４２．８，１０２．４，８４．９，６６．１，ｋＤａ，并计算出它们的作用比重，建立了回归方程，提出了利用蛋白质谱带选育小麦品种时应注意的问题。同时对与加工品质关系较大的Ｚｅｌｅｎｙ沉淀值与蛋白谱带的关系进行了分析     

THE DEVELOPMENT PATTERN OF DOTHISTROMA NEEDLE BLIGHT AND ITS CONTROL

From field investigations and inoculations,Dothistroma pini,the pathogen ofDothistroma needle blight was found to overwinter as mycelium and unmatured acervuli in infectedneedles.The conidia were spreaded mainly by rain splash.The disease became widespread by trans-porting discased seedlings and seions conidia spread throughout the growing season,but mainlyfrom May to July.The diseade was found in both stand locations in each summer of investigation.The outbreak severity was serious in pure stands of susceptible pine and mixed stands with largecomponents of suseeotuble pine.but slight in mixed stands of unsusceptible species with small com-ponents of suseeptible hosts.The disease was less severe in pruned stands than in unpruned stands.The disease was most serious near the infection centre.indoor and outdoor tests,it was shown thatChlorothalonil smoke,Chlorothalonil spray and Thiram and Asomate sprays were effective controlfungicides.     

核桃子叶不定根发生调控的研究

以核桃成熟或近成熟种实子叶为试材 ,在 1 4DKW基本培养基上其顶部 (近胚端 )的生根率达1 0 0 % ,而中部和基部 (远胚端 )的生根率为 0。在生根过程中顶部内源吲哚乙酸 (IAA)表现为初期上升 ,其后稳定在一定水平 ,当根原基开始生长时 (培养 4d)出现一个高峰 ;而中、基部内源IAA水平在培养初期下降 ,而后维持在一定的水平 ;蛋白凝胶电泳分析表明 :62 .8和 3 8.4kDa是与子叶不定根发生相关的蛋白条带 ,在不定根发生过程中 ,该带在子叶顶部表达增强 ,而中部、基部则消失。当培养基中附加一定水平的吲哚丁酸(IBA) ( 0 .5～ 1 0mg·L- 1 )时 ,子叶中、基部被诱导产生不定根 ;附加 2mg·L- 1 IBA ,其内源IAA的变化与子叶顶部在 1 4DKW基本培养基上发根时有相似的趋势 ;同时该处理启动表达了 62 8kDa蛋白条带和抑制表达3 8 4kDa蛋白条带。反之当培养基中附加 6-苄氨基腺嘌呤 (BAP)又抑制子叶生根 ,也抑制了与生根相关的IAA变化和蛋白表达。这一结果和良好的研究模式为从分子水平上深入认识木本植物不定根发生机制奠定了基础。     

高黎贡山自然保护区东坡水平带蚂蚁群落研究

研究了高黎贡山东坡水平带蚂蚁群落特征，结果表明，除中南段2500m等高线外，东坡各水平带的不同位置均有特有种。在1000m、1500m、2000m、2500m等高线上，从北到南特有种数目依次递增，但北段1500m和2000m等高线出现特有种增高例外。在东坡不同海拔等高线上，大多数物种只在1个样地中表现为优势种，北段与南段的优势种通常不同。在1000m和2000m等高线上北段的优势种多于南段，而在1500m等高线上南段优势种多于北段，2500m等高线上不同地段优势种趋于相等。东坡水平带上物种数目和密度表现出普遍规律性。从北到南，1000m和2500m等高线上物种数目和密度依次递增，在1500m等高线上物种数目和密度依次递减。在1000m等高线上优势度、多样性和均匀度具有明显规律性。从北到南，优势度依次递减，多样性和均匀度依次递增，但在北段出现例外。在1500m、2000m和2500m等高线上，蚂蚁群落的优势度、多样性和均匀度缺乏规律性，可能与植被的次生化和片断化等因素有关。尽管东坡水平带上同一海拔植被类型相似，但是蚂蚁群落之间差异显著，相似性系数在0－0．50之间。山体下部1000m等高线上蚂蚁群落之间相似性较大，相似性系数在0．25－0．50之间。随着海拔增加，同一水平带上群落之间相似性减小。     

Elastic Band Gaps in Two-dimensional Phononic Crystals Based on Multiple-scattering Theory

Two dimensional solid phononic crystals such as plates, shells can be widely applied to the control of vibration and noise as a kind of structural materials. It is very significant to study the band gaps in two dimensional phononic crystals to apply them in the vibration and noise control for structures and as a filter for acoustical signal. The multiple-scattering theory is integrated with wave equations to study the elastic wave band gaps in two-dimensional phononic crystals. The carbon/proxy system is used as numerical example. The results show that a full band gap is presented when carbon cylinder with high propagation velocity is arranged periodically in proxy with low propagation velocity.     

PD Online Measurement of Transformers with Wide Frequency Band System and the Noise Eliminating Method by Cascaded IIR Lattice Notch Digital Filter

The frequency band of conventional partial discharge (PD) measurement systems is selected just within several ten kilohertz. With the development of computer and digital signal processing techniques, wide frequency band (WFB) measurement systems have been used to detect PD in electrical equipment for its higher sensitivity. Nevertheless, the WFB measurement systems are easy suffered from the interference of strong field electromagnetism noises. A set of PD online monitoring system with frequency band from 50 kHz to 1 megahertz used for transformer is developed, in which pre-processing device and cascaded 2nd order IIR lattice notch digital filter are mainly used to suppress periodic narrow-band interference. With analysis of field monitored signal at a 220 kV substation, it is shown that the monitoring system not only can detect and extract the discharge pulse signal effectively, but also has the powerful capability of suppressing interference.