The effect of alkali metal oxide on the properties of borosilicate fireproof glass: Structure,thermal properties,viscosity, chemical stability

The purpose of the current work was to research the effect of alkali metal oxide on the structure, thermal properties, viscosity and chemical stability in the glass system (R₂O–CaO–B₂O₃–SiO₂) systematically. Because the glass would emulsify when Li₂O was added to the glass batch, this article did not discuss Li₂O. The results showed that when the amount of Na₂O was less than 4 mol.%, there was a higher interconnectivity of borate and silicate sub-networks in glass, as more mixed Si–O–B bonds were present in glass. The glass samples exhibited excellent thermal properties and chemical stabilities. As the amount of Na₂O exceeded 4 mol.%, the interconnectivity of borate and silicate sub-networks was weakened. The thermal properties and chemical stabilities of the glass samples were reduced. The connectivity of the silicate sub-network was weakened slightly as the Na/K ratio varied, and the coefficient of thermal expansion (CTE) of the glass samples gradually increased, and the resistance to thermal shock (RTS) value gradually decreased. Moreover, the viscosity of the glass samples decreased with the ratio of Na/Si and Na/K increased.     

基于UG的蜗杆传动虚拟试验环境开发

鉴于蜗杆传动性能试验测试的复杂性,利用Unigraphics高端CAD/CAE软件,建立了蜗杆传动的虚拟试验环境;根据各因素对蜗杆传动的影响情况,实现了各种影响因素数据库的建立以及和UG的链接;利用知识驱动的参数化设计功能,通过程序调用数据库参数建立了蜗轮-蜗杆的三维模型;完成了蜗杆传动虚拟试验环境的各种参数设置;并利用该虚拟试验环境进行了实际蜗杆传动的试验测试工作。结果表明,该虚拟试验环境能够基本满足蜗杆传动的试验要求,试验数据能够为蜗杆传动的设计提供较为可靠的计算依据,且能够节约大量的试验工时和费用。     

低熔封接玻璃组成及其发展

综述了低熔封接玻璃的组成特点，给出了大量低熔玻璃组成实例，批出了低熔封接玻璃的封接低温化和无铅化发展方向，磷酸盐玻璃是首选组成之一。新的制备工艺和新的玻璃形成体系将对封接玻璃发展起着十分重要的作用。     

裂缝性潜山储层地震描述技术

裂缝是潜山油气藏的重要储集层 ,潜山的油气产出与裂缝的发育情况密切相关 ,因此 ,对裂缝发育控制因素和裂缝发育规律进行了分析和探讨。尽管单条裂缝在地震资料上难以识别 ,但是裂缝带在地震资料上有其特征。描述了裂缝储层的地球物理特征 ,并利用测井约束反演技术、吸收系数技术、地震相分类和相干分析技术对潜山储层进行预测。通过在车古 2 0 1潜山的应用实例分析 ,说明以上 4种储层描述技术比较有效     

一种基于特征点匹配的图像拼接方法研究

针对图像间因具有旋转及光线强度差异等现象而导致的拼接效果不佳及拼接速度慢的问题,提出一种基于特征点的配准算法;在特征点提取阶段,尺度不变的特征变换方法 (SIFT)具有对图像尺度缩放、旋转、放射变换以及亮度变化保持不变的优点,文章采用了改进的SIFT特征点提取算法;在特征点匹配阶段,采用改进的RANSAC算法对特征点匹配对提纯;最后用加权平均法实现拼接图像的融合;实验证明,该算法有效提高了图像拼接的效率和准确性,拼接精度可以达到亚像素级。     

30%苄氨基嘌呤悬浮剂对芹菜生长和品质的影响

田间条件下研究了不同浓度苄氨基嘌呤悬浮剂对芹菜生长和品质的影响。结果表明,剂量浓度在60~120 mg/kg范围内均可提高芹菜的株高和产量,120 mg/kg剂量浓度处理对亩产量和株高的提高幅度达到了显著水平(P<0.05);药剂对芹菜安全性和品质分析结果表明,试验药剂30%苄氨基嘌呤悬浮剂各剂量浓度对芹菜均没有明显药害,对芹菜的干物质重量、维生素(Vc)和可溶性固形物含量均无显著影响。     

Effects of surfactant and particle size on the microstructure and strength of Si3N4 foams with high porosity

The highly porous Si₃N₄ ceramic foams were prepared by direct foaming with mixed surfactants. The surface tension and viscosity of slurries were tailored by different carbon chain length of surfactants and different mean Si₃N₄ particle size to achieve the pore size controlling. The nearly linear relationship between the pore size and the ratio of surface tension to viscosity was observed, which indicates that the pore size could be precisely tailored by the slurry properties. Si₃N₄ ceramic foams with porosity of nearly 94%, mean pore size of 110–230 µm, and compressive strength of 1.24–3.51 MPa were obtained.     

硬脆材料专用ELID磨削液的研制

本文在已有新型通用ELID磨削液(HDMY-20型)的基础上，根据硬脆材料的磨削特点和ELID磨削过程中磨削液的电解修锐生膜缓蚀作用、结合通用ELID磨削液的研制经验．通过增添表面活性剂、稳定剂、防锈剂、油性极压剂和调整无机盐等成分的比例关系．优化出适合硬脆材料ELID磨削最佳状态的专用ELID磨削液。应用此磨削液磨削硬质合金表面粗糙度可达Ra0．007μm比通用型磨削液磨削的硬质合金Ra值降低了0．005μm。     

Personalized identification of abdominal wall hernia meshes on computed tomography

An abdominal wall hernia is a protrusion of the intestine through an opening or area of weakness in the abdominal wall. Correct pre-operative identification of abdominal wall hernia meshes could help surgeons adjust the surgical plan to meet the expected difficulty and morbidity of operating through or removing the previous mesh. First, we present herein for the first time the application of image analysis for automated identification of hernia meshes. Second, we discuss the novel development of a new entropy-based image texture feature using geostatistics and indicator kriging. Third, we seek to enhance the hernia mesh identification by combining the new texture feature with the gray-level co-occurrence matrix feature of the image. The two features can characterize complementary information of anatomic details of the abdominal hernia wall and its mesh on computed tomography. Experimental results have demonstrated the effectiveness of the proposed study. The new computational tool has potential for personalized mesh identification which can assist surgeons in the diagnosis and repair of complex abdominal wall hernias.     

亚硝酸型反硝化生物脱氮的节能机理及优化方案

须焦化污水处理工艺中，通过对亚硝酸型反硝化生物脱氮与硝酸型反硝化生物脱氮工艺的比较，探讨了需氧量、耗碱量及投资降低的机理。试验得出的优化方案是以NaOH为碱源的亚硝酸型反硝化生物脱氮工艺。