一种有效的编辑距离和编辑路径求解技术

给定字符串Ｔ．Ｐ，将Ｔ转换成Ｐ所需的插入，删除，替代序列称为Ｔ到Ｐ的编辑路径，其最短编辑路径所需的插入，删除替代总数称为Ｔ到Ｐ的编辑距离，本文提出一种有效的编辑距离和编辑路径求解技术，该技术首先通过一有效的字符串相似匹配算法计算出编辑距离，而后仅通过简单的二进制字位运算正确计算出编辑路径。     

Connecting Chinese Standards to IEC Standards

During research on different stan- dards for electrical accessories and household electrical appliances it has been suggested that to connect Chinese standards to IEC(International Electrotechnical Commission)standards we should carry out essential innovations based on assimilat- ing according to our own practical conditions.This method is the only way to standardize and at the same time maintain Chinese characteristics.     

Preparation and thermophysical properties of nano-sized Ln2Zr2O7 (Ln?=?La, Nd, Sm, and Gd) ceramics with pyrochlore structure

Rare earth zirconates (Ln₂Zr₂O₇, Ln = La, Nd, Sm, and Gd) with pyrochlore structure were prepared by hydrothermal method with polyethylene glycol as surfactant. X-ray diffraction, thermogravimetric analysis/differential scanning calorimetry, Fourier transform infrared spectroscopy, Raman spectroscopy, and field emission scanning electron microscopy were utilized to characterize the phase structure, thermal decomposition, and morphology of the products. Qualitative analysis indicates that the as-prepared zirconates are pyrochlore-type structures. The specific surface area, lattice parameter, and average crystallite size of the as-prepared products are closely related to the ionic radius. The activation energy of crystal growth shows an increasing trend with the decrease in ionic radii. The sintering behavior of compacted body was also investigated, revealing that the sintering-resistance properties of Ln₂Zr₂O₇ are descending as the order of La₂Zr₂O₇, Nd₂Zr₂O₇, Sm₂Zr₂O₇, and Gd₂Zr₂O₇.     

数控机床的联网通讯与程序管理应用实例

介绍了数控DNC的功能特点,机床联网的实施方案、系统维护以及应用实例。     

围挡式洁净区的单向流特性研究

通过实验分析围挡式洁净区的3个特性指标，即：流线平行度、乱流度和下限风速，并指出其应用价值和市场前景。     

Application of selective implantation in Al0.5Ga0.5As/In0.25Ga0.75As/GaAs pseudomorphic single quantum wire structures

A pseudomorphic Al0.5Ga0.5As/In0.25Ga0.75As/GaAs asymmetric quantum wire (QWR) structure was grown on GaAs V-grooved substrate by low pressure metal organic vapor phase epitaxy. The formation of crescent shaped QWRs at the bottom of the V-grooves was confirmed by both transmission electron microscopy and photoluminescence (PL) spectra. The temperature dependence of PL spectra demonstrated a fast decrease of the sidewall quantum well PL intensity with increasing temperature, which originates from relaxation of carriers from well to wire region. The self-aligned dual implantation technique was successfully used to selectively disable the adjacent quantum structures. Decrease of the PL intensity of QWR at 8 K was observed after selective implantation, which resulted from a decreased number of carriers relaxed from adjacent quantum structures.     

乌龙茶新品种乌棪的营养成分及感官分析

对乌龙茶新品种乌棪及其嫁接母本大叶乌、黄金桂进行营养成分分析,并对其感官指示及品质指标进行比较,得出初步结论,乌棪的常规营养组成成分与大叶乌、黄金桂无明显差异,滋味及香气较大叶乌为佳,与黄金桂较为接近,同时又有其独特之处,具有较高的推广价值。     

仿生眼的研究现状与发展趋势

首先,在分析人眼眼球运动的特点和形式的基础上,详细介绍了国内外仿生眼研究对扫视性眼球运动、平滑性眼球运动、异向眼球运动、前庭动眼反射、视动反射等的模仿,最后总结了仿生眼研究的特点和发展趋势．     

IPM智能功率模块在高精度惯导测试设备中的应用

为满足高精度惯导测试设备的需要,针对我国目前直流伺服系统仍采用IGBT、晶闸管为主功率电路的现状,采用第五代智能功率模块IPM开发了一款新型的直流伺服系统;该系统相对于采用传统功率器件的伺服系统在性能指标与可靠性方面都有极大地提高,电流环带宽达到了1kHz.同时具有很好的电磁兼容性;应用于某高精度惯导测试设备0.001°/s速率检测,速率精度为0.0×10°,速率平稳度为9.2×10-5,结果表明,IPM智能功率模块应用于惯导测试设备中,系统性能稳定,伺服精度高,尤其是在功率密度和抗干扰性能方面表现突出,具有很好的应用前景.     

软模板法制备超细钨酸铅

钨酸铅集中了钨和铅的抗辐射特性,制造粒径超细的钨酸铅以提高其防辐射的能力很有特色.钨酸铅的粒度大小直接影响它对放射性物质的防护能力,粒度越小分散越均匀的钨酸铅,防护能力越好.软摸板合成法研究超细PbWO4的制备,严格的实验条件,是保证获得超细、均匀的钨酸铅的重要途径,优于其他物理和化学制备方法.以表面活性剂作软摸板,用S-60为水体系的W/O微乳液区成功地合成了超细PbWO4.实验结果证明,以S-60为分散剂的软摸板制备的超细PbWO4,粒度分布均匀,采用正交实验法创造最佳实验条件:以S-60为表面活性剂,分散剂浓度为稀释30倍,溶液pH值为9,反应物浓度为0.01 mol/L,搅拌速率1300 rpm,Pb(Ac)2溶液缓慢滴加到Na2WO4溶液中,得到超细的目标产物,用于防辐射的填料.