径扭复合模式盘形压电超声换能器

提出一种新型的斜缝式结构径扭复合模式振动盘形压电超声换能器,并对其径扭复合模式振动进行了理论和试验研究。通过对斜槽处应力的分解,引入两个机械转换系数,依据机电类比原理,建立起换能器的径扭复合模式振动耦合机电等效电路模型,从等效电路得到换能器的径扭复合振动频率方程,探讨狭缝的斜角对换能器共振频率的影响,数值计算表明换能器共振频率随斜角增大而降低。试验加工三个不同斜度狭缝的换能器,并对其共振频率进行了测试和有限元法模态仿真计算,结果表明,理论与仿真值及试验结果吻合较好。     

六通道方位旋转关节技术研究

文中介绍了一种六通道方位旋转关节的设计方法,对旋转关节的整体布局、各通道旋转关节设计的关键技术进行了详细的介绍,并给出了测试结果.该旋转关节由一路X波段高功率波导通道、两路X波段低功率同轴通道及三路L波段同轴通道组成.整个旋转关节结构形式紧凑,各项性能指标优良,加工调试方便,可广泛应用于雷达及微波系统中.     

用于CMOS图像传感器芯片的版权保护盲水印算法

提出了一种易于硬件实现的、用于图像版权保护的自适应盲水印算法。利用R、G和B分量在图像信息中各自的不同特点做不同处理;根据人眼的视觉特性,通过对图像G分量纹理强度分析自适应地选择合适的水印拉伸因子,从R分量中提取图像内容来加密水印,对B分量进行DCT变换来嵌入不可见盲水印。采用伪随机序列发生器实现水印置乱,基于DCT中低频系数求均值来嵌入盲水印,大大降低了硬件消耗。实验结果表明,算法对噪声干扰、滤波、锐化、剪裁和模糊处理具有很好的鲁棒性,提取出的水印的归一化相关系数均在0.5之上,大于人眼可识别的检测阈值。     

CJY6421D汽车后桥壳自动焊接设备的研制

介绍了CYJ6421D汽车后桥壳CO2自动焊接设备的设计思想、结构原理及特点,控制系统的软、硬件,证明了该设备是一套焊接越野车或轻型车后桥壳理想的自动焊接设备。     

Significance of zircon trace element geochemistry,the Shihu gold deposit,western Hebei Province,North China

The Shihu gold deposit is characterized by gold-bearing quartz-polymetallic sulfides and quartz veins.Both Mapeng granitoids batholith and intermediate-basic dikes intruded the metamorphic basement rocks,and are spatially associated with gold mineralization.Trace element abundances in zircons from the Shihu gold deposit,determined by laser-ablation microprobe ICPMS analysis,are sensitive to source rock type and crystallization environment.Concentrations of 21 trace elements were determined for zircons from granitoid rocks,diorites,quartz diorite porphyrites and gold-bearing quartz veins revealed some elemental characteristics and chondrite-normalized trace element patterns from different samples.There were no distinctive differences in REE concentrations of zircons from plutonic rocks and quartz veins,indicating that they probably had the same origin.Relatively flat chondrite-normalized REE patterns with(Yb/Sm)N ratios less than 60 characterized zircons from quartz diorite porphyrites and quartz veins.The highest Nb/Ta ratios were found in zircons from quartz diorite porphyrites,whereas the lowest ratios were found in quartz vein zircons.The Nb/Ta ratios were broadly correlated with HREE+Y contents,and had weak positive correlations with the depth of the Eu negative anomalies.High values U up to 0.4% and Th up to 0.1%,as well as positive correlations with REE+Y characterized zircons from quartz vein.The lowest Th/U ratios of zircons present in quartz veins reflected the relatively high concentration of U in hydrothermal fluid,and high Pb concentrations only typified quartz vein grains relatively enriched in U and Th.Zircons from quartz diorite porphyrites showed the most pronounced Ce anomalies,whereas weak Ce anomalies were typical of zircons from quartz veins,in which Eu/Eu* of zircons had a broadly negative correlation with Ce/Ce*.Trace element geochemistry of zircons from mineralized quartz veins and plutonic rocks confirmed that the sources of ore-forming materials were from Precambrian host rocks.Our results significantly enhanced the usefulness of zircon in crustal studies of the North China craton and as an indicator mineral in mineral exploration of the Taihang region.     

黑龙江省黑木耳加工进展与开发前景

随着人们保健意识的不断增强,药食同源的黑木耳越来越受到人们的喜爱。黑木耳含有丰富的活性营养成分,具有多种医疗保健作用。黑龙江省是黑木耳主产区,产量和质量都位居世界首位,大力发展黑木耳精深加工市场前景广阔。本文就黑龙江省黑木耳的加工进展与开发前景进行了综述,旨在为黑龙江省黑木耳加工提供重要的参考依据。     

硅基氧化物薄膜的结构及光吸收特性的研究

采用射频磁控共溅射方法制备了纳米Ge颗粒尺寸的Ge-SiO2薄膜、非晶Si-SiO2薄膜和非晶AlSiO复合薄膜，分析了样品的结构，研究发现3类样品均存在较强的吸收，对于Ge-SiO2薄膜观察到光吸收边随Ge颗粒尺寸变小而蓝移的现象，这主要是由于Ge颗粒的量子限域效应所引起的。而对于非晶样品也出现了光吸收边蓝移和能隙展宽的现象，这可能是由于样品中的杂质或缺陷等受到限域作用的结果。     

薄膜用碳酸钙种类选择研究

测试了不同细度的重质碳酸钙和轻质碳酸钙的吸油率，以及重质碳酸钙填充母料和轻质碳酸钙填充母料的熔体流动性和成膜性。结果表明，不论重质碳酸钙还是轻质碳酸钙，细度越高，吸油率越高，加工流动性越差；重质碳酸钙的吸油度低于同等目数的轻质碳酸钙，而加工流动性和成膜性则优于后者，重质碳酸钙是制造填充薄膜的适宜材料。     

海口市水资源供需平衡分析及对策研究

海口市的水资源极为丰富,但是由于缺乏水资源配置工程,部分地区在非汛期出现了水资源供不应求的局面。本文对海口市2010、2020及2030年的需水量进行了预测,对海口市不同典型年可利用水资源量和可控水资源量进行了研究,根据全市水资源供需情况和行政区域(不包含南渡江流域)水资源供需情况的具体分析,得出海口市工程性缺水的结论;并提出了以修建南渡江下游拦蓄工程为主要工程性措施以缓解和解决海口市长远水资源供需矛盾的建议。     

建筑节能设计及评估的软件开发

阐述了建筑节能设计及评估系统软件的构成、功能和开发该软件所用到的工具软件，并给出了一些关键性的程序源代码。该软件具有很好的开放性和扩展性，能满足不同地区的建筑节能设计和评估工作的要求。