Research of the Love and Marriage Writing in Nanyang Narrative Novels of Returned Overseas Chinese Writers in 1980-2002

爱情与婚姻是文学书写的基本母题之一，历来为中外作家所钟爱，在归侨作家的南洋叙事中，婚恋书写不仅仅局限于爱情与婚姻本身，它的内涵是多义且丰富的，其中既有对个体恋爱悲喜剧的描写，亦有对爱情与人生、社会及历史时代深广联系的展现，正因为如此，归侨作家南洋叙事中的恋爱与婚姻故事，在让我们领略了爱情的“升华与枯萎”之后，也给我们带来了无限的深思。因而本论文作者选取婚恋书写这一角度切入文本，试图探讨潜藏在文本背后的深刻的历史文化内涵。 全文分为三章。 绪论部分主要包括厘清本论文的论述范围，界定本论文涉及的主要概念，以及对学术界关于归侨作家小说现有研究成果的梳理，并指明本论文的创新点和主要研究方法。 第...Love and marriage is one of the basic theme in literary creation, which is always loved by the Chinese and overseas writers. In Nanyang narrative of Returned Overseas Chinese Writers, the rich writing of love and marriage show us both much tragicomedy in each relationship, and the deep link between love and history and life. And because of this we will enter into the meditation after reading those...学位：文学硕士院系专业：人文学院_中国现当代文学学号：1022012115227

Synergistic effects of low temperature in winter and ebb tide at night on Sonneratia apetala seedlings growth and key eco-physiological traits

利用人工控制手段,模拟冬季低温和夜间低潮对无瓣海桑幼苗的影响,分析气温-水温协同作用下无瓣海桑幼苗的低温适应机制.结果表明:低温显著抑制了无瓣海桑幼苗株高和基径的增长,而提高水温5℃对其的缓解作用分别达41.2%和44.6%;低气温(15℃)显著降低了叶片的最大光化学效率(fV/fM)值,进而影响叶片的光合能力,而提高水温未能显著缓解其损伤;低气温时,提高水温能促进幼苗叶片脯氨酸的积累,增加可溶性糖含量,缓解低温对叶片的伤害.极端低温发生时,夜间高潮对幼苗起到较好的保温作用,缓解了低温对幼苗生长和叶片的生理伤害,提高了无瓣海桑幼苗的成活率.By setting up a set of simulated tidal systems with different air-and water temperature and tidal flood conditions,this paper studied the synergistic effects of low temperature in winter and ebb tide at night on the growth and key eco-physiological traits of Sonneratia apetala seedlings.Low air temperature depressed the seedlings growth,but the reduction in the seedling height and basal stem diameter was compensated 41.2% and 44.6%,respectively by a 5 ℃ increase of water temperature.Low air temperature(15 ℃) reduced the leaf Fv/Fm significantly,indicating a dramatic reduction in the leaf photosynthetic capacity,whereas the flooded tide with higher water temperature could not compensate this damage.The flooded tide with high air temperature increased the proline and soluble sugar contents in mature leaves,which could protect the mature leaves from cold damage.When extreme cold events occurred,the flooded tide at night worked as a heat storage medium,which alleviated the cold damage on the seedlings growth and leaf physiological traits,and promoted the survival rate of S.apetala seedlings.国家自然科学基金项目(30700092);福建省自然科学基金项目(2009J05085)资

空间约束对概念的提出与实现

等价类对数据库查询计划的生成与优化有重要作用。为了减少查询计划的搜索空间,空间数据库管理系统(Ingres),将空间拓扑关系视为等价关系,并将空间拓扑关系沉入查询树底端先执行。由于非等值空间关系谓词不具备等价类的传递性,常常导致一些空间查询不能正确执行。本文提出了空间约束对的概念,即将非等值空间谓词连接的2个空间列、或某表的空间列与其空间索引表中的KEY列(记录了MBR)视为空间约束对。空间约束对除不具备等价关系的自反性、对称性和传递性外,其启发式策略仍可沿用等价类的相关规则。此外,本文还探讨了空间约束对在Ingres中的实现,并开展了相关的实证研究。实验表明:将空间拓扑谓词两端的属性视为空间约束对后,原本不能正确执行的查询语句,在改后的Ingres中能正确地找到较优执行计划