基于字符特征的数字字符识别算法

提出了一种基于字符特征的数字字符识别算法,对识别过程和算法实现进行了详细介绍。该算法避免了细化、轮廓提取和模板匹配等复杂的计算,具有计算简便、实现简单的优点。     

Study on Collision Characters for SPAR Platform

This paper presents the research on the external mechanism of collision characters for a SPAR platform. The collision characters of SPAR platform have not attracted so much attention as that of ships in the past, because short of this kind of collision accidents reported. But with the increasing number of SPAR platforms in the world, the possibility of such kind of accident also increases. Therefore, it is necessary to master the character of SPAR collision. Model test technique is employed to study the external mechanism. The collision scenario is a ship colliding with a SPAR platform moored in the site with 1500 meters water depth. The striking ship hits the SPAR platform on the hard tank near water surface in its longitudinal direction. The specifics of the SPAR＇s motions and the tension forces of the mooring lines are collected to summarize the hydrodynamic characters in the collision scenario. It is found that the maximal displacements and the maximal pitch angles of the SPAR platform, and the maximal tension forces of mooring lines are all linearly proportional to the initial velocity of the striking ship basically. Mooring lines play elastic roles in the collision course.     

线纹尖塘鳢的形态特征、染色体核型及分类学地位

以1996年由澳大利亚Fiyzroy河水系引进的野生线纹尖塘鳢幼鱼群体和经池塘驯养、混合选育、繁殖多代的幼成鱼为材料,进行形态生物学的观测、分类地位研究;采用PHA腹腔注射、肾细胞直接制片法,进行染色体核型分析。结果表明,线纹尖塘鳢(Oxyeleotris lineolatus)与云斑尖塘鳢(O. marmoratus)是尖塘鳢属中亲缘关系最接近的单系类群,完成了其系统分类学的定位,支持将尖塘鳢从塘鳢属中分出的传统分类处理,从细胞学角度,证明传统分类的正确性。提出两种尖塘鳢种间杂交可能性很大,与塘鳢属、乌塘鳢属和沙塘鳢属间杂交的可能性也存在。     

红树植物红海榄叶化学组成研究

对红树植物红海榄叶的基本化学成分水分,灰分,灰分中酸不溶物,灰分中S(SO42-),粗蛋白,粗脂肪等及氨基酸和微量元素的组成和含量进行了系统的分析测定。其基本化学组成各成分含量分别为:水分(69.18%),灰分(3.04%),灰分中酸不溶物(0.094%),灰分中S(SO42-)(0.052%),粗脂肪(7.75%),粗蛋白(7.14%);测得了红海榄叶中17种氨基酸,其总含量为10.7mg/g,其中人体必须氨基酸有7种,占所含氨基酸总量约26%;采用全谱直读等离子体原子发射光谱仪对红海榄叶进行了31种微量元素的分析测定,测得了其中18种元素的含量,红海榄叶中含有丰富的人体必须的矿物质元素。     

地震数据分数阶域空间预测滤波方法研究

将分数阶傅氏变换引入地震数据空间预测滤波中,研究滤波效果与信号保真的最佳折衷.利用分数阶傅氏变换把信号旋转变换到任意1个角度时"频"平面,运用奇异值分解(SVD)方法求取空间预测滤波算子,实现预测滤波;通过数据相关系数和相对误差能量曲线评价滤波效果.研究结果表明,可以找到1个合适的分数阶域,使得分数阶域空间预测滤波能够在压制噪声和保留信号特征两方面达到最佳折衷,较一般f-x域预测滤波具有更大灵活性.     

提高绳索取心钻进效率的有效途径

提高绳索取心钻进效率要做到:一是根据孔深、钻孔孔径、钻孔所遇地层及其岩性的完整程度、构造特点、风化带发育深度等选择套管的直径及下入深度;二是采取措施克服轴向压力预防孔斜;三是根据钻遇岩石的可钻性级别选择钻头,按照一定顺序依次使用,并合理控制时效及提钻间隔;四是根据地层特点,钻孔深度,施工要求选择合适的钻井液技术参数;五是根据钻井过程中遇到的特殊现象及钻井液漏失程度判别漏失类型,并采用合理的堵漏方法,实现安全钻进;六是定期检查钻具,更换破损、变形部件,作好维修保养工作。     

藏北羊湖地区孢粉组合及其1.3万年以来的古气候变化

近年在羊湖地区全新世沉积物中采获了大量的孢粉化石，依据孢粉的种类、含量变化及年龄值划分了孢粉组合带，建立了孢粉组合序列，识别出3个气候变化旋回，初步分析了该地区1．3万年以来的古气候变化规律，具有环境研究意义。     

成煤古气候研究进展：替代参数,方法与问题

总结和评述了成煤古气候分析中的主要替代参数（岩石学和沉积学参数，地球化学参数和古植物学参数）、数字模拟技术的现状，新进展及其局限性；指出建立各类替代参数数据库和参数的定量化，有利于成煤期的古气候重建，揭示古气候对聚煤作用的控制和建立古泥炭沼泽模式。     

TCM-90现场试验台风能量频散波列特征

采用ＴＣＭ－９０（台风运动－９０）台风现场科学试验资料,对台风ＦＬＯ,ＥＤ个例进行了诊断分析,并做了有关数值试验研究。分析研究结论揭示了台风涡旋作为一动力、热力强迫源或ＣＩＳＫ不稳定结构,其与环境场相互作用可激发出动能频散波列;台风扰源通过频散机制可构成类似２维Ｒｏｓｓｂｙ波的经向波列;台风涡旋的移动路径与上述能量传播特征有一定的相关关系。     

Pediculate Brachiopod Diandongia pista from the Lower Cambrian of South China

The Chengjiang Lagerstatte has been celebrated for prolific soft-bodied fossils. Based on specimens recently excavated in the Chengjiang Lagerstatte by the Early Life Institute, Northwest University, Diandongia pista Rong, 1974, is directly revealed to be a pediculate brachiopod, assigned to the Family Botsfordiidae, as is further confirmed by the exceptionally preserved vascular system including dorsal and ventral mantle canals. These specimens described herein exhibit some peculiarities, notably the extremely thin and long pedicles, which suggest that Diandongia is epifaunal rather than burrowing brachiopod. A study of this group of animals indicates that they may be vital to understand the relationship between the lingulids and the remaining brachiopods, and the character evolution of the early Cambrian brachiopods.