犯罪现场碎片拟合系统设计与实现

犯罪现场纸质碎片的计算机自动合成将提高办案民警的工作效率,为侦查办案提供有益的线索和侦查方向。提出现场碎片扫描获得原始图像,图像处理获得边缘,图形比对获得碎片之间的对应关系,并依此关系将原始碎片图像进行计算机自动复原的技术路线。基于OpenCV图像处理平台,采用面向对象的分析和设计方法,设计并实现了犯罪现场碎片拟合系统,实验证明了技术路线的可行性,为进一步在复杂情况下碎片拟合研究奠定了基础。     

高炉上料系统的变频调速改造

文章阐述了高炉上料系统的变频调速改造,提出了改造的必要性及改造方案,说明了运行效果的表现性.     

Sedimentation processes and sedimentary characteristics of tidal bores along the north bank of the Qiantang Estuary

A tidal bore is a unique Earth surface process, characterized by its highly destructive energy, predictable periodicities and magni-tudes, and the production of characteristic sedimentary features. Tidal bores and associated rapid flood flows are highly turbulent flows of the upper-flow regime with a velocity over several meters per second. Reynolds (Re) and Froude (Fr) numbers, respectively, are larger than 104 and 1.0, making them significantly different from regular tidal flows but analogous to turbidity currents. Until now, understanding of tidal-bore depositional processes and products has been limited because of the difficulty and hazards involved with gauging tidal bores directly. The Qiantang bore is known as the largest breaking bore in the world. Field surveys were carried out in May 2010, along the north bank of the Qiantang Estuary to observe the occurrence of peak bores, including regular observations of current, water level and turbidity at the main channel. Several short cores were sampled on the intertidal flats to study the characteristic sedimentary features of tidal bores. Hydrodynamic and sedimentological studies show that the processes of sediment resuspension, transport and deposition are controlled primarily by the tidal bores, and the subsequent abruptly accelerated and decelerated flood flows, which only account for one tenth of each semidiurnal tidal cycle in the estuary. Tidal-bore deposits are generally poorly sorted because of rapid sedimentation after highly mixed suspension by intense turbulence. This behavior is characteristic of the absence of tractive-current depositional components in a C-M diagram. It also goes along with well-developed massive bedding, graded bedding, basal erosion structures, convolute bedding and dewatering structures. Together, these sedimentary features can constitute fingerprinting of turbidites, widely distributed in the deep-water environment. However, a tidal bore is triggered by intensely deformed tidal waves propagating into a shallow-water environment, which returns to regular tidal flows rapidly after the passage of the bore head. The tidal-bore deposits are usually bounded by the intertidal-flat deposits with typical tidal beddings at the top and on both flanks. The difference between tidal-bore deposits (TBD) and tidal sandy/muddy deposits (TSD/TMD) is evident not only in sedimentary structures, but also in the grain-size composition. They can be clearly distinguished in grain-size bivariate plots, typically the plot of mean grain size vs. standard deviation (or sorting). Some trend variations generally exist in mean grain size with TBD>TSD>TMD, sorting with TMD>TBD>TSD (larger value indicating poorer sorting), and both skewness and kurtosis with TSD>TBD>TMD. These findings will undoubtedly shed new light on our understanding of tidal-bore sedimentology, ancient tidal-bore sedimentary facies and environments, and related oil-and-gas field prospecting.     

一类二阶Dirichlet边值问题正解的存在性

文章运用不动点指数理论得到了一类含有一阶导数项的二阶微分方程在Dirichlet边界条件下正解的存在性结果.     

α-环糊精与聚（乙二醇-L-乳酸）二嵌段共聚物的包结物的制备与表征

合成了聚（乙二醇-L-乳酸）二嵌段共聚物（PELA），并制备了其与α-环糊精（α-CD）的包结物（IC），通过红外光谱、差热扫描量热、广角X射线衍射和核磁共振氢谱对产物的结构和性能进行了表征。结果表明：PELA分子链被包结在α-CD分子形成的管道中，α-CD分子管道并排紧密排列，形成六方晶系的晶体。在IC中PELA链活动被限制，无结晶和熔融现象。IC中的α-CD与聚乙二醇嵌段结构单元的物质的量之比为1/4.7。     

洱海流域铅和锰含量测定及其卫生学意义

目的：通过对洱海流域（大理地区）水源的抽样调查,了解洱海流域水源中铅、锰的含量。方法：选择洱海流域主要的入湖河流、洱海表层水作为研究对象,利用原子吸收分光光度法检测水样中铅、锰的含量。结果：洱海流域中锰的平均含量为0.013 6mg/L,而铅的平均含量为0.828 0mg/L;与《生活饮用水卫生标准》（GB 5749-2006）比较,锰的合格率为100%,铅的超标率为100%。结论：洱海流域中铅含量严重超标,存在潜在危险性,给相关部门防止铅在洱海湖泊内发生生物蓄积提供一定的依据,从而为居民提供健康的饮水环境。     

从历史文化视角看英汉语言中的性别歧视现象

性别歧视作为一种社会现象曾普遍存在于东西方文化中.语言是文化的载体,在很大程度上是文化的一面镜子.英汉语言中带有性别歧视的词汇就是这种文化现象的反映.本文拟从历史文化视角探悉这一现象产生的根源并提出当下的应对策略.     

聚苯板保温墙体节能优化

文章以外墙保温材料聚苯板为例,利用保温材料厚度优化式,举实例并推导出聚苯板保温材料最佳厚度及聚苯板的工程造价,再根据采暖耗煤量指标计算,进行节能前后造价对比分析,分析节能效果,得出结论.     

一种适用于16级TDI CMOS图像传感器的电流型累加器(英文)

提出一种适用于混合域累加的16级时间延迟积分(Time Delay Integration,TDI)型CMOS图像传感器的电流型累加器.为了实现混合域的累加,电流信号首先在电流型累加器中累加4次,累加的结果被量化成数字量后再次完成4次的累加,即4×4的混合累加模式.详细分析了电流型累加器的热噪声和闪烁噪声特性,并给出了等效输入噪声的均方根电压表达式,并结合仿真工具进行分析验证.提出的电流型累加器电路在CMOS180nm 1.8V供电电源的工艺下实现,电路的功耗为0.37mW,芯片面积为0.03mm×0.82mm.经过电流型累加器的4次累加后,能够将信号的信噪比提升5.86dB.     

铁路营业线施工安全惯性问题及对策

铁路营业线施工的特点是时间紧、涉及部门多、对运输生产干扰大.文章通过对施工前预备工作超量、损坏运营设备、营业线附近作业侵限、作业方式不当,造成红光带、封锁施工不能按计划完成、应急预案研究不细等惯性问题进行分析,找出了产生这些问题的原因,提出了针对性的对策.