基于改进MCNN的密度图在室内定位中的应用

北京商场购物人群众多,易发生人群拥挤踩踏事故,使得确定高密度人群区域的位置变得至关重要,因此本文引入人群密度图,确定图中人群分布情况,得出室内人群的定位信息。首先将采集的人群视频分割为图像帧,并分成训练集和测试集;然后对训练集图片作人头标签处理,生成地面实况密度图,将其作为改进的多列卷积神经网络算法的训练数据生成模型,并将模型应用于测试集图片生成人群密度图;最后运用ArcGIS对人群密度图与室内平面图作地理配准处理,从而实现对高密度人群的定位。研究结果表明,利用人群密度图确定的高密度区域的位置坐标与实际坐标值基本一致,将人群密度图应用于室内定位是可行的。     

Shock metamorphism in plagioclase and selective amorphization

Plagioclase feldspar is one of the most common rock‐forming minerals on the surfaces of the Earth and other terrestrial planetary bodies, where it has been exposed to the ubiquitous process of hypervelocity impact. However, the response of plagioclase to shock metamorphism remains poorly understood. In particular, constraining the initiation and progression of shock‐induced amorphization in plagioclase (i.e., conversion to diaplectic glass) would improve our knowledge of how shock progressively deforms plagioclase. In turn, this information would enable plagioclase to be used to evaluate the shock stage of meteorites and terrestrial impactites, whenever they lack traditionally used shock indicator minerals, such as olivine and quartz. Here, we report on an electron backscatter diffraction (EBSD) study of shocked plagioclase grains in a metagranite shatter cone from the central uplift of the Manicouagan impact structure, Canada. Our study suggests that, in plagioclase, shock amorphization is initially localized either within pre‐existing twins or along lamellae, with similar characteristics to planar deformation features (PDFs) but that resemble twins in their periodicity. These lamellae likely represent specific crystallographic planes that undergo preferential structural failure under shock conditions. The orientation of preexisting twin sets that are preferentially amorphized and that of amorphous lamellae is likely favorable with respect to scattering of the local shock wave and corresponds to the “weakest” orientation for a specific shock pressure value. This observation supports a universal formation mechanism for PDFs in silicate minerals.     

基于Qtopia的嵌入式电子菜单系统设计和实现

研究了Qtopia体系结构和在Linux系统下建立Qtopia交叉开发编译环境,在此基础上设计电子菜单的开发框架以及应用程序,开发基于Qtopia图形化的人机接口界面（GUI）,并用中文显示,移植到ARM9开发板中,界面友好,运行正常,有效地改善了人机接口操作效率,提高了产品的质量.     

CINRAD/SA雷达冰雹探测算法效果检验及参数本地化

2004年CINRAD/SA雷达新的冰雹探测算法(HDA)代替了原来的算法,新的冰雹探测算法(HDA)估测任意尺寸的冰雹概率(POH)、直径大于等于19 mm的强冰雹概率(POSH)和最大冰雹直径预测(MEHS)。结合济南雷达探测资料对冰雹探测算法预测效果进行了检验,虽然有较高的探测准确率,但同时错误率较高,临界成功率较低,最大冰雹尺寸预测值与实况的平均差值约为14.6 mm。对2002~2005年济南雷达站的历史资料进行了统计分析,降雹单体和非降雹单体在最大反射率因子上存在较大差异,5、6、7月的降雹单体最大反射率因子平均值分别为59.7、61.86、3.9 dBz,非降雹单体最大反射率因子平均值分别为53.8、54.9、55.6 dBz。依据统计数据,对冰雹探测算法中的反射率因子等门限值调整为53 dBz后,冰雹预测仍具有较高的探测准确率,错误率和临界成功率得到了明显改善;对最大冰雹尺寸预测中的算法因子门限值调整后,预测值与实况有较好的对应关系。     

地质灾害中的应变局部化现象

首先介绍应变局部化现象及其研究进展，然后介绍地质灾害中常见的应变局部化现象，即边坡失效、圆形洞室失效、地震中的局部化现象和流固耦合应变局部化现象。采用材料的分叉分析方法和变形局部化的数值模拟研究，可望对地质灾害的机理分析、预测和控制提供新的思路。     

广西佛子冲矿铅锌矿体定位预测研究

在佛子冲矿田构造形迹复杂,中酸性岩浆岩发育,铅锌矿体的产出与控矿构造的性质、规模以及围岩的性质、蚀变类型和强度密切相关。本文通过对佛子冲矿田构造特征、矿化蚀变分带和主要成矿带受北北东向构造控制以及矿体在走向上有从西南向北北东侧伏的特征研究,建立了佛子冲铅锌矿床地质模式,在探讨佛子冲铅锌矿成矿规律和矿体定位特征的过程中,指出了佛子冲这座危机矿山的进一步找矿的具体区域;提出佛子冲矿北北东带的北部六塘一带为首先布置工程区。     

隐伏矿定位预测的矿田(床)构造地球化学方法

选择有效的找矿方法实现隐伏矿定位预测是国际地学界的一大难题。通过10多年在云南会泽铅锌矿、昭通毛坪铅锌矿、易门铜矿与陕西铜厂铜金多金属矿等矿山的研究与实践,总结提出了隐伏矿定位预测的构造地球化学研究内容。在此基础上,综合了矿田(床)构造地球化学找矿方法的主要特点,认为矿床(田)构造地球化学方法是受构造控制的金属矿床隐伏矿定位预测的有效方法之一。     

Expression,purification, and subcellular localization of phospholipase C in Dunaliella salina

Plants possess effective mechanisms to respond quickly to the external environment. Rapid activation of phosphatidylinositol-specific phospholipase C (PLC) enzymes occurs after a stimulus. The PLC in Dunaliella salina plays important roles in growth and stress responses. However, the molecular basis of PLC action in D. salina remains little understood. To gain insight into the potential biological functions of this enzyme, we cloned a phospholipase C gene from D. salina in a previous study, named DsPLC (GenBank No. KF573428). Here, we present the prokaryotic expression, purification, and characterization of the DsPLC gene. The entire coding region of DsPLC was inserted into an expression vector pET32a, and the DsPLC gene was successfully expressed in Escherichia coli. The DsPLC protein was purified and identified using a polyclonal antibody and western blotting. Expressing DsPLC fused with a green fluorescent protein (GFP) in onion showed that DsPLC-GFP was localized to the intracellular membrane. Quantitative real-time PCR analysis revealed that the relative expression of the DsPLC gene was induced significantly by 3.0-mol/L NaCl at 4 h. Our results support the importance of PLC enzymes in plant defense signaling. This study provides a basis for further functional studies of the DsPLC gene and for additional analysis of the potential roles of PLC enzymes in response to abiotic stress.     

基于GNSS多径信号的反射面参数估计算法

全球卫星导航系统(GNSS)多径信号广泛存在于城市峡谷等复杂导航定位场景中.多径信号在干扰GNSS接收机并造成系统定位精度下降的同时,也为接收机提供了周边反射面环境信息.在码相位延迟幅度联合跟踪算法(CADLL)实现GNSS多径信号感知和特征参数提取的基础上,设计实现了基于粒子滤波的反射面参数估计算法.该算法可以在GN...     

常用小波及其时频特性

小波分析以其良好的时频局部化效果,能够用来分析时间序列不同频率的非稳定能量特征。目前,有许多可供选择的小波函数,这些函数的时频特征各不相同,根据研究目的选择合适的分析小波函数就显得非常重要。针对常用的几个实数和复数小波函数,以Nino3海面季度平均温度时间序列(1871-1996,5oS~5oN, 90o~150oW)为例,分别研究它们的时频特征,希望为实际应用过程中选择合适的分析小波提供依据。研究发现,消失矩越大,时域小波越窄,时间分辨率增强,波动幅度越大;而频域小波与时域相反。复数的Morlet小波具有良好的频率分析能力,而Mexican hat小波(Gauss函数的二阶导数)则具有优秀的时间分辨能力。相对小波的总能量谱,复数小波的实部或虚部的能量谱能够明显提高分析结果的时间分辨率,但并不影响小波的频域分辨力。