基于Canny边缘检测算子的雷达图像1/8插值改进算法

雷达扫描图像的图像信息单一,大部分为黑色背景,运用传统的1/8图像插值算法放大显示不仅运算复杂度高,处理延时大,而且会使雷达目标航迹的图像边缘十分模糊,难以得到满意的视觉效果。为此,结合Canny算子检测雷达扫描图像的边缘,提出了一种雷达图像1/8插值改进算法。实验结果表明,经本文算法插值放大的雷达扫描图像的目标边缘清晰,且算法复杂度较低,便于硬件实现,可实现实时图像缩放。目前该算法已成功应用于雷达站某系统的图像处理模块。     

大气混合污染物对大鼠肺脏中血红素氧合酶1表达的影响

通过观察大气污染物引起大鼠肺损伤的病理组织学变化,分析肺组织内血红素氧合酶1（HO-1）的表达量的变化,为大气污染所致肺损伤的生物学标记物的研究提供科学依据。实验方法如下：将30只Wistar大鼠,随机分为3个实验组（3d、7d、30d组）和3个对照组（3d、7d、30d组）,对实验组大鼠染尘染毒后提取所有大鼠肺组织,观察其病理组织学变化;RT-PCR技术检测各组肺组织中HO-1的mRNA表达;Western-blot技术检测各组肺组织中HO-1蛋白的表达。结果显示：实验组（7d及30d）的肺组织病理形态学评分显著高于对照组（7d及30d）,实验组（7d及30d）大鼠肺组织HO-1mRNA表达与对照组相比,具有显著性差异（P均〈0.05）。随着吸入大气混合污染物的时间延长,肺组织内的HO-1蛋白表达水平逐渐增高,实验组（7d及30d）与对照组（7d及30d）相比,差异有显著性意义（P〈0.05）。在吸入大气混合污染物后早期（7d）,HO-1转录水平升高。持续吸入混合大气污染物（30d）,大鼠肺组织出现明显的病理组织学变化,HO-1转录水平、蛋白表达水平均比对照组明显升高。得出结论：可将HO-1作为大气混合污染物所致的肺损伤的早期生物学标记物;采取某些手段增加肺组织HO-1的表达,可能会减少混合大气污染物对肺组织造成的损伤。     

我国食品安全监管体系理论探析——基于博弈理论

＂国以民为本,民以食为天＂,食品安全事关国计民生。近期我国食品安全问题频繁发生,知名品牌卷入食品安全问题的漩涡之中。通过博弈分析,本文认为我国食品安全监管存在＂激励悖论＂,建立和完善食品安全监管体系的三重约束和三道防线是解决我国食品安全问题的有效途径和重要手段。     

Extended activated sludge model no. 1 (ASM1) for simulating biodegradation process using bacterial technology

Phosphorus is one of the most important nutrients required to support various kinds of biodegradation processes. As this particular nutrient is not included in the activated sludge model no. 1 (ASM1), this study extended this model in order to determine the fate of phosphorus during the biodegradation processes. When some of the kinetics parameters are modified using observed data from the restoration project of the Xuxi River in Wuxi City, China, from August 25 to 31 in 2009, the extended model shows excellent results. In order to obtain optimum values of coefficients of nitrogen and phosphorus, the mass fraction method was used to ensure that the final results were reasonable and practically relevant. The temporal distribution of the data calculated with the extended ASM1 approximates that of the observed data.     

Lower back muscle forces in pushing and pulling

Abstract

In the investigation of lower back stress, the muscle forces of the erector spinae and the rectus abdominis are often calculated using the two-dimensional biomechanical model. These muscle forces are used to estimate the compressive forces at L5/S1 disc This paper presents a study of the muscle forces predicted by a two-dimensional biomechanical model during pushing and pulling and myoelectric activity from the corresponding muscles. The goal was to investigate whether a simple two muscle torso model would reasonably estimate the muscle actions in pushing and pulling tasks. Six subjects participated in the experiment. EMG (rms) value was used as an indicator of muscle forces. The results show high correlation between the predicted muscle forces and the measured root-mean-square EMG values in trunk pushing and pulling (r²=0.93) and hand pushing and pulling (r²=0.96) in an erect posture with hips braced but low in hand pushing and pulling using a free posture (r²=0.37).     

（2＋1）维KD方程组的行波解

通过行波变换将（2＋1）维KD方程组转变为复域中的常微分方程,给出复化的（2＋1）维KD方程组的亚纯解结构.     

Oxidation behaviors of Ni-Cr-Al superalloy foams at 1 000 ℃ in air

The oxidation behaviors of Ni-16Cr-xAl （x=4.5%, 9.0%, mass fraction） superalloy foams in air at 1000℃ were investigated. The effects of AI content on the resistance to high temperature oxidation were examined. The oxidation mechanisms of the foams were discussed. The results show that the resistance to the oxidation of the Ni-16Cr-xA1 based alloy at 1 000 ℃ increases with the content of A1 increasing from 4.5% to 9.0%. Complex oxide products are formed on the surface of the superalloy foams after the oxidation. Cr203 and A1203 are the predominant oxides for the scales of the foams with 4.5% A1 and 9% A1, respectively. Excellent high temperature oxidation resistance and superior pore conformation stability for the Ni-16Cr-xA1 based superalloy foam with 9% A1 can be mainly attributed to the formation of relatively continuous and protective A1203 oxides on the surface of the foam.     

CrAIN／TiAIN纳米多层膜的微结构及其性能研究

采用磁控反应溅射法制备了不同调制周期的CrAIN／TiAIN纳米多层膜,并通过x射线衍射仪、显微硬度计、扫描电镜分析了调制周期对多层膜的微结构、力学性能和高温抗氧化性能的影响。结果表明：CrAIN／TiAIN纳米多层膜共格外延生长,呈现CrAIN（或TiAIN）面心立方结构,且呈（111）择优取向;CrAIN／TiAIN纳米多层膜在某些调制周期出现硬度异常升高的超硬度效应;CrAIN／TiAIN纳米多层膜比CrAIN,TiAIN单层膜具有更好的高温稳定性,高温时仍具有较高的硬度。     

Mn2+掺杂对LiFePO4正极材料结构、性能及嵌锂动力学的影响

为了改善橄榄石型LiFePO4正极材料的性能,采用高温固相法合成了Mn掺杂的LiMnxFe1-xPO4(x=0,0.10,0.25,0.40,0.50)材料.采用X射线粉末衍射、扫描电子显微镜、充放电测试、循环伏安和电化学阻抗谱研究了材料的结构、电化学性能和锂离子嵌脱动力学.结果表明,锰掺杂的LiFePO4样品颗粒分布比较均匀,具有较小的平均粒径和窄的粒度分布,LiMnxFe1-xPO4是纯相的橄榄石结构.在不同倍率下,LiMn0.4Fe0.6PO4具有最高的放电容量和最好的动力学性能.Mn的掺杂提高了LiFePO4材料的可逆性、锂离子扩散系数和放电容量,减小了电荷转移电阻,进而提高了其动力学性能.