煤矸石山风化堆积物水分动态研究

以位于贵州省赤水市的"黔北20万吨/年竹浆林纸一体化工程项目"为例,研究了低山丘陵区开发建设项目中的水土保持和生态建设问题.针对该工程水土流失的现状和特点,结合竹原料林基地建设,提出了水土流失的防治原则和采取的防治对策.实施水土保持方案后,能有效控制工程区的水土流失,恢复和改善项目区的生态环境,保障了工程建设的安全,实现了社会、经济、环境的协调与可持续发展.     

中国土壤重构及其土水特性研究进展

土壤是土地生态系统的基底和基础,土壤重构对土地复垦、土地质量提升和生态环境恢复等具有重要意义。本文采用文献分析法和对比分析法,分析了我国土壤重构基本概念与内涵、土壤重构技术及其土水特性运行机理。根据研究对象、研究目的、填充材料和关键技术的对比分析,认为土壤重构与土体有机重构两者的概念与内涵存在交叉和包含关系,两者研究对象及目的均为损毁土地及缺陷土地的再生利用及其生态系统恢复,关键技术侧重土壤剖面结构和功能的重构;重构材料属于包含关系,土体有机重构填充材料多为有机物和生物材料,包含矿区副产品等。根据土壤损毁的特征,将土壤剖面重构类型分为功能退化型、土层损毁型、土层结构紊乱型和土层污染型。土壤重构材料的选取应因地制宜;土壤重构施工技术应更多关注如何减少对土壤结构的破坏和降低压实度,从而减轻对表土的破坏并提高土壤生产力。土壤重构主要针对矿区土地复垦,其对土水特性的影响侧重于模型模拟和土壤的保水性,重构后的土壤对土壤中水分和溶质运移有一定的阻碍作用,不利于降水入渗补给;土壤重构研究还应关注不同土壤重构模式下短时间序列土壤水分运移及其机理。针对目前土壤重构技术发展现状,建议今后深入开展土壤重构的生态材料研发、土壤与其他要素耦合机理、全过程监测和信息化技术融合、农区土壤重构和城市景观重构等方面的理论与技术研究。     

遗传距离与利用微卫星进行系统树构建初探

以中国牛亚科家畜6个群体12对微卫星数据为基础,采用6种遗传距离（DA、DC、DS、DSW,（σμ）^2和DTL）和2种聚类方法（UPGMA和NJ法）,探索它们对系统树构建准确性的影响。结果表明：微卫星位点平均杂合度水平显著影响系统树构建的准确性,用DA和DC遗传距离构建的系统树准确性相对较高,但很难确定NJ法和UPGMA法哪一种更适合于系统树的构建,而DTL遗传距离用于系统树构建有待进一步完善;最后,对微卫星用于家畜系统树构建的有效性和局限性进行了探讨。     

Management of eyelid neoplasms in the dog and cat

Eyelid neoplasms are common in the older dog and typically benign. Eyelid neoplasms in the cat are less common and more often malignant. Resection of eyelid masses may be curative; however, restoration of the eyelid structure after mass excision is essential for maintaining long-term ocular surface health. Surgical techniques and instrumentation for eyelid surgery are reviewed. Indications, benefits. and limitations of sharp excision, cryotherapy, and laser excision and ablation are discussed. Neoplasia of the third eyelid is also discussed.     

Key Links and Solutions for the Relationshipsabout Reconstruction of Old Buildings

Following the rapid development of the revolutions in housing system,reconstruction of old buildings is rising.In order to make the reconstruction proceed smoothly,in this paper the author studies the secondary parts,reinforcing foundation,dismantlement of some parts of an old building,linkage of new and old frames,solutions for the four relationships,and others.     

Construction of Orthogonal Wavelets Bases and Design of Algoritm

Based on the brief introduction of the principle of wavelet analysis,a summary of several typical wavelet bases from the point of view of perfect reconstruction of an image is given.It is emphasized that designing wavelet bases which are used to decompose the image into sub band form is equivalent to designing a fliters with perfect or nearly perfect property.The generating algorithm corresponding to Daubechies bases and some simulation results are also show in this paper.     

平原地区采煤塌陷对土地的影响及复垦治理

阐述了平原煤矿区采煤塌陷对土地自然形态、土壤结构、地下水位等方面的影响,论述了重建矿区土地生态系统的意义,并提出了重建矿区土地生态系统的几项措施。     

Trends in relief design and construction in opencast mining reclamation

This paper examines trends in topography design and construction in opencast mining restoration. The greatest geomorphological focus is the protection of aquatic ecosystems downstream of reclaimed sites through the construction of topographies and structures that not only reduce sediments and contaminants to a minimum, but which soften the impact of maximum water flows. From the ecological point of view, the most important focus is the integration of the geomorphological component with those of the soil and vegetation, and the formation of a functional ecosystem with the capacity to maintain itself. The conceptual models of relief that have been used in practice are discussed and criticized: these include the platform‐bank model (geotechnically but not ecologically stable), faithful reproduction of the original topography (inadequate in steep areas), and understanding the hydrological basin as a restoration unit (now considered the most appropriate). Finally, erosion models are reviewed as tools for relief design. The practicality of ‘RUSLE 1.06 for Mined Lands, Construction Sites and Reclaimed Lands’ is underlined owing to its ease of use. Copyright © 2003 John Wiley & Sons, Ltd.     

多变量时序相空间重构中嵌入维和时间延迟的选择

提出了一种用于多变量时序相空间重构的嵌入维和时间延迟联合算法,它利用不同嵌入维和时间延迟重构相空间后所得的预测误差进行比较,最小的误差所对应的嵌入维和时间延迟作为最佳的嵌入维和时间延迟。仿真结果表明,该算法有效地克服了虚假邻点法和误差最小法中必须先选取时间延迟的缺点,大大提高了预测的精度。