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The effect of surface roughness of aluminum oxide (95%) substrate on the properties of Ni-Cr alloy thin film is studied.The thin films are prepared on the substrates with different roughness by using magnetron sputtering.The micro-structure,adhesive and electrical properties of the thin films were investigated by using scanning electron microscopy,scratch method and four-probe method.The burst voltage and current of the thin film transducers with different substrates were measured according to D-optimization method.The results show that the particle size,structural defect,resistivity and adhesion strength of the thin film increase with the increase of the substrate roughness.The difference among the burst time of the samples with difference substrate roughness gradually decreases with the increase of stimulation amount.The burst time is approximate to 20 μs in the charging voltage of 37 V. 相似文献
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自2007年以来由美国次贷危机引起的全球性金融危机严重影响了我国各行业的就业形势,而大学生的就业情况更是受到广泛的关注。国家近期推出了一系列鼓励大学生到基层就业和自主创业的政策,对面l临毕业的大学生尤其是与国家“三支一扶’礅策密切相关的医学院校大学生产生了一定的影响,对此,笔者以哈尔滨医科大学大庆校区的临毕业学生为调查对象进行了调查,旨在了解当前形势下医学院校学生的就业心里和工作意向等真实想法,为高校的就业指导工作提供科学依据,以便更多的吸引优秀的医学人才到基层从事医疗卫生工作,减轻社会就业压力,促进社会的和谐发展。 相似文献
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施工企业工程造价管理剖析 总被引:2,自引:0,他引:2
阐述了如何做好与施工企业密切关系的投标阶段、施工阶段、竣工验收阶段的工程造价管理,指出只有提高工程造价的管理水平,做好工程造价管理工作,才能提高企业的经营效果,以期指导实践。 相似文献
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气体中微量一氧化碳、甲烷、二氧化碳的气相色谱分析 总被引:5,自引:0,他引:5
建立了甲烷转化气相色谱法测定气体中一氧化碳、甲烷、二氧化碳的分析方法。采用一阀两柱系统,氯气、氯化氢通过十通阀经柱Ⅰ(Hayesep Q)反吹出系统,一氧化碳、甲烷、二氧化碳通过柱Ⅱ(Porapak Q)进入氢火焰离子化检测器进行检测,通过外标法定量,结果表明该方法线性好,各组分的检出限分别为一氧化碳0.02×10-6(mol/mol)、甲烷0.05×10-6(mol/mol)、二氧化碳0.08×10-6(mol/mol)。该方法简便、准确、灵敏、重现好。 相似文献
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The mechanical dewatering of activated sludge is troublesome due to its high compressibility of solids. The dewatering can be enhanced dramatically by the use of electroosmosis,in which an electric field is applied to the sludge cake.In this study,the influence of filter cloth on the cathode on the dewatering of activated sludge was investigated.It was found that thicker filter cloth led to lower water removal from the sludge cake,so a stainless steel cathode net with small pore size instead of filter cloth was applied,which improves the dewatering efficiency and reduces the electric power consumption.Moreover,water absorbent materials were helpful to remove the water from the sludge cake.For the electroosmotic dewatering at 7 kPa and 24 V·cm-1,the water content in the sludge cake decreased to 60%(by mass) with the average 0.075 kW·h·kg-1of water removed by using the cathode net. 相似文献
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小波阈值去噪方法是研究最为广泛的方法之一,基于此方法提出了许多改进算法。然而,这些改进的小波阈值去噪算法都没有对低频子带进行处理。本文采用自适应中值滤波对小波变换的低频子带进行处理,而对高频子带采用通用阈值去噪算法。实验结果表明噪声方差越大(即噪声污染越严重),重构图像PSNR提高的越多;对于噪声方差较小及细节较少的图像来说,重构图像的PSNR不是很理想。 相似文献
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为了克服Chan-Vese(CV)模型对初始轮廓敏感的不足,提高分割效率,针对双目立体图像,提出了一种基于双目视差的CV模型。该方法利用双目立体图像的双目视差进行预分割,将分割得到的结果自适应地构造为CV模型的初始轮廓,再通过改进后的能量泛函进行曲线演化,使其接近真实目标边缘,最后得到预期的分割结果。经过实验证明,该模型能有效分割双目立体图像,提高分割效率,对初始轮廓也具有较好的鲁棒性。 相似文献