利用高分辨率的遥感卫星影像更新1:1万比例尺数字地形图的研究

详细阐述了利用高分辨率遥感卫星影像进行1:1万比例尺数字地形图更新的基本技术流程、更新方式以及关键技术.并且利用面向对象的遥感影像分类方法和信息提取技术,获得了较满意的地图更新专题信息.结果表明利用高分辨率遥感卫星影像进行数字地形图更新是一种周期短、见效快、效率高、花费少的切实可行的方法.     

The cubic space group of tungstogallate acid,H<Subscript>5</Subscript>GaW<Subscript>12</Subscript>O<Subscript>40</Subscript>

The space group of tungstogallate acid, H₅GaW₁₂O₄₀, reported by Niu et al. (J. Chem. Crystallogr. 2003, 33, 799) should be I–43m instead of Cm; the monoclinic C-centered cell is transformed to the I-centered cubic cell by (1 0 0; ,– , 1; – , – , –1).     

Purported “melamine cyanuric acid trihydrochloride” C3H6N6⋅C3H3N3O3⋅3HCl is actually “diprotonated-melamine cyanuric acid dichloride dihydrate” (C3H8N6)2+⋅C3H3N3O3⋅2Cl−⋅2H2O

On the basis of the published results, melamine cyanuric acid trihydrochloride (MCA3HCl) is shown to be better described as diprotonated melamine cyanuric acid dichloride dihydrate (C₃H₈N₆)²⁺C₃H₃N₃O₃2Cl^–2H₂O. Details are given of the revised hydrogen bonding scheme, which requires further elaboration.     

教材《多媒体CAI物理化学》中一例题的勘误

分析了面向21世纪课程教材《多媒体CAI物理化学》教材中一个例题解答中存在的错误,并结合教材的教学内容和学习要求提出合理的修正方案。     

因素修正法在征地统一年产值测算中的应用——以北海市直辖区为例

在分析主导耕作制度调查法缺陷的基础上,提出了分析和测算征地统一年产值的方法.因素修正法在测算单元的测算中能够很好地揭示各个测算单元的产值的主要影响因素.因素修正法在统一年产值的测算是可行、科学的,可在征地统一年产值及农用地年产值的测算中推广应用.     

Φ-强增生映象方程解的迭代逼近

在一般Banach空间中研究了Φ-强增生映象方程解和Φ-强伪压缩映象不动点的修改的Ishikawa迭代逼近.用Φ-强增生算子代替强增生算子,使以往的相应结果更具一般比.     

13C‐NMR spectra of santalol derivatives: a comparison of DFT‐based calculations and database‐oriented prediction techniques

A systematic investigation of a series of santalol and epi‐santalol derivatives by means of ab initio and density functional theory (DFT) calculations together with database‐oriented prediction methods leads to a configurational reassignment within this compound class. The DFT calculations as well as the HOSE‐code and neural network‐based predictions allow deriving a general rule set for unambiguous assignment within this compound class. The methyl group in position 2′ serves as an indication for the configuration at this stereocenter allowing easy differentiation between santalol derivatives and their diastereomers belonging to the epi‐santalol series. Copyright © 2009 John Wiley & Sons, Ltd.     

结构动内力的精确算法──局部效应及振型迭加法的修正

在使用集中质量法进行地震响应分析时,忽略了连续质量产生的局部效应．本文在文献*的基础上提出了一个计算局部效应的简便而合理的方法。并通过抗震计算实例说明局部效应的影响是不能忽略。     

低温蓄冷器流动特性的理论分析和实验研究 第一部分:理论模型分析及实验修正

蓄冷器是脉冲管制冷机等回热式制冷机的关键部件 ,其性能的好坏将直接影响制冷机的性能和效率。交变流动蓄冷器内部热量和动量的传输及转换过程是传热学、流体力学和热力学耦合在一起的复杂问题。文中从声电类比出发 ,提出了交变流动蓄冷器声阻抗分析方法 ,进行了初步的理论发析 ,并通过实验作了进一步的修正。该模型是建立在波动分析基础上的 ,可定性分析相关的实验现象和结果     

An unprecedented rearrangement of a 1,1-diprotected hydrazine derivative. Structure revision of a catalyst-containing by-product

Treatment of 1-Boc-1-tosyl-hydrazine with 1,1,3,3-tetramethylguanidine (TMG) gave rise to two products, one containing and the other not containing TMG. The latter was identified as 1-Boc-2-tosyl-hydrazine. This rearrangement provided useful insight into the nature of the first product that had previously been isolated and assigned an incorrect tentative structure. To rationalize the results a plausible mechanism via a common intermediate, involving TMG as a nucleophilic catalyst is proposed. A simpler procedure for the preparation of the starting material is also presented.