基于转台的线阵激光雷达地面检校方法研究

介绍了一种基于转台的线阵激光雷达地面检校方法,该方法通过布设物方检校控制场,使用指示激光器建立激光测距值与物方控制点之间的对应关系并引入激光测距的加/乘常数与外方位元素一并作为检校参数,通过坐标转换列出误差方程式;最后使用最小二乘平差解算所有的检校参数。文中给出了实测数据的实验结果分析及精度评定,验证了本文方法的可行性。     

高度优先加法链m元标量速乘算法研究

为提高标量点乘在移动计算设备中的运算效率,并增强其计算安全性,比较分析了加法链方法、m-ary方法等标量点乘方法的执行过程和加速性能特征,提出了基于高度优先加法链和自由窗口宽度的Improved-m-ary的标量点乘方法。分析结论和实验仿真数据表明,该方法能有效减轻标量平均汉明重量,降低标量点乘计算量,内嵌的窗口值杂乱化机制使得其针对旁路信道分析攻击表现出出色的免疫力。     

Shallow circuits and concise formulae for multiple addition and multiplication

A theory is developed for the construction of carry-save networks with minimal delay, using a given collection of carry-save adders each of which may receive inputs and produce outputs using several different representation standards.The construction of some new carry-save adders is described. Using these carry-save adders optimally, as prescribed by the above theory, we get {, , }-circuits of depth 3.48 log₂ n and {, , }-circuits of depth 4.95 log₂ n for the carry-save addition ofn numbers of arbitrary length. As a consequence we get multiplication circuits of the same depth. These circuits put out two numbers whose sum is the result of the multiplication. If a single output number is required then the depth of the multiplication circuits increases respectively to 4.48 log₂ n and 5.95 log₂ n.We also get {, , }-formulae of sizeO (n ^3.13) and {, }-formulae of sizeO (n ^4.57) for all the output bits of a carry-save addition ofn numbers. As a consequence we get formulae of the same size for the majority function and many other symmetric Boolean functions.     

农药合成中使用各种有机单元反应的统计分析

对主要包括杀虫剂、杀菌剂和除草剂等在内的农药系列产品的合成和生产，所使用到的各种有机单元反应，进行了统计分析。但最近几年，整个农药行业都在倡导用新的技术和方法，来合成和生产高效、低毒、安全的绿色农药新品种，因而使农药合成中各种有机单元反应被使用的频率百分数的统计分析发生了变化。     

反应合成2-[（4-硝基苯基）羟甲基]丙烯酸酯

通过MBH反应,用路易斯碱催化丙烯酸酯与对硝基苯甲醛的亲核加成反应,合成了一系列2-[（4-硝基苯基）羟甲基]丙烯酸酯。研究了各种因素对产率的影响,优化了反应条件。离子液体[N-μ-（CH2CH2）3N＋H][CH3COO-]为催化剂;THF为溶剂;反应物最佳配料比为：n（丙烯酸酯）∶n（对硝基苯甲醛）∶n（离子液催化剂）=3∶1∶1;在室温下反应24h。目标产物经柱色谱分离提纯,对其分子结构进行了1 H NMR,13C NMR,IR表征。     

加法可逆半环上的Fuzzy同余

定义了加法可逆半环上的Fuzzy同余关系，讨论了带有Fuzzy同余关系的加法可逆半环S的性质。证明得出：如果S是一个带有Fuzzy同余关系μ的加法可逆半环，则S关于μ的Fuzzy同余类做成一个加法可逆半环。给出了带有Fuzzy同余关系的加法可逆半环的同态性质。     

Effect of Cd Addition on Superconducting Fluctuations and Mechanical Properties of Bi1.82Pb0.36Sr2Ca2Cd x Cu3O y System

A study was made of the effect of Cd additions on the superconducting and mechanical properties of Bi_1.82Pb_0.36Sr₂Ca₂ Cd_xCu₃O_y (x = 0.0, 0.15, 0.25, 0.35 and 0.55). Characterization of the Cd-samples using XRD, DTA, and SEM techniques, has confirmed that remarkably formation of low-T _c phase (2212) by the addition of Cd up to 0.35. High-resolution electrical resistivity ρ (T) data on the composition of Cd = 0.35 have been taken for investigating critically the superconducting fluctuations. Using the Aslamazov and Larkin (AL) and Lawrence and Doniach (LD) models of excess conductivity. Excess conductivity analysis shows that this composition (Cd = 0.35) is 2D in the temperature range 137.8–163.7 K and a 3D one below 137.8 K. Thus, a crossover from 2D to 3D is observed at 137.8 K. Sample microhardness and density are greatly improved by Cd-additions (0.35). This trend is probably due to the intercalation of cadmium between superconducting grains in compositions may provide a plastic-flow region that allows relaxation of undesirable stresses resulting from the grain anisotropy of superconductors.     

粉煤和石灰石加入位置对循环流化床燃煤过程NOx与N2O排放的影响

在30kW的循环流化床(CFB)上进行3种煤的燃烧实验,考察了粉煤和脱硫剂加入位置、分级燃烧以及空气过剩系数对NOX和N2O排放的影响。所采用的CFB燃煤系统由提升管和下行床构成,提升管主要用于粉煤燃烧,下行床主要用于固体床料循环和粉煤热解。粉煤或脱硫剂分别自传统的一次空气布风板上方和下行床上部两个位置加入。结果表明,在不加脱硫剂的条件下,降低空气过剩系数和一次空气化学计量比均可有效降低NO排放,但对N2O排放则呈现上升、下降和无明显变化多种趋势。当粉煤加入位置自传统的提升管下部改变到下行床上部时,减少空气过剩系数或减少一次空气化学计量比可明显降低其中两种煤的NO排放,并可少量降低另一种煤N2O的排放;从下行床加入粉煤时,空气分级和低O2燃烧对NO排放的影响程度有所减弱。最后,对一种煤进行了脱硫实验,随Ca/S摩尔比的升高,SO2排放显著降低,NO排放升高,而N2O则先上升后下降;且自下行床加入时,NO排放更低;CaCO3加入位置变化对N2O排放无明显影响。     

继电保护整定计算中运行方式的选择方法

整定计算软件中运行方式的选择存在着全面性和合理性的困难。提出了把整定计算中的运行方式分解为厂站大小方式、供电方式和检修规则三者的组合的分解方法。以计算最小助增系数时运行方式的选择为例介绍了厂站方式、供电方式和检修规则的选择方法和理论依据。最后以复杂环网结构实例分析说明了这种分解方法能缩小运行方式的选择范围并保证选择合理,便于计算机编程实现,从而有效减少故障计算的次数和提高整定计算结果的正确性。