植物护坡在水土保持中的应用及水文效应分析

随着开发建设项目的逐年增多,斜坡防护成为水土保持工作的重要内容之一,在众多的防护措施中,植物护坡因其不仅具有边坡防护功能,还能改善生态环境,而被广泛应用。在水土保持工程中,植物护坡主要有种草护坡、造林护坡和综合护坡工程。植物护坡水文效应主要体现在植被的降雨截留、削减溅蚀、抑制地表径流等方面。     

岩质边坡植被恢复研究

基于生态护坡技术和植被群落构建思想,根据边坡修复中采用不同的生态护坡技术和植物物种选择而呈现出的多样的恢复效果,从边坡特点与护坡技术、植生基材设计与配比、植物配置和植被群落构建的关系等方面,对深圳几个岩质边坡人工生态恢复工程案例进行研究.     

公路边坡防护与生态恢复

论述了公路边坡植物防护的主要形式如种草、铺草皮、液压喷播植草护坡、框格防护、合成材料植被网草皮护坡、喷混植生植物护坡、绿化笼砖护坡、香根草生物边坡防护技术、客土喷播技术等,在目前,公路防护工程设计要针对设计对象的土质、水文、气候等特点,灵活采用不同的防护型式,确保公路边坡的可持续性。     

植物根系护坡的有限元数值分析

利用植物的根系来固土、护坡在国内外很多项目中都有应用,但是理论的支持还比较匮乏.为了进一步完善植物根系护坡的理论依据,深化有限元强度折减法在根系护坡领域的运用,以刺槐和油松根系为研究对象,把根系和土体结合在一起,通过有限元强度折减法模拟得到边坡的滑动面和稳定性安全系数.研究发现有林边坡的安全系数高于无林边坡,且安全系数高出了7%~18%左右.研究表明:选择适当的植物和植物密度更利于护坡,这为指导植物根系护坡提供了理论依据.     

公路边坡植物防护机理研究

探讨了植被护坡存在的问题,分析了植物根系护坡力学机理.以实际工程为例,研究了不同植物根系对土的物理力学指标的影响,为植物在工程绿化和边坡稳定方面的应用提供理论指导.     

公路边坡的生物防护对策

文章主要介绍了公路边坡的生物防护对策,首先分析了公路边坡的特点和生物护坡的功能,然后探讨了公路边坡绿化植物选择方法和常见的植物护坡方法。     

三维土工网垫植草护坡性能试验

通过边坡模型正交试验,在不同降雨强度下分析了网垫类型、草籽密度、土质和坡度等4个因素对三维网垫植草护坡性能的影响。结果表明,坡面侵蚀模量在模拟小雨时受影响因素显著性高低顺序为草籽密度、坡度、土质和网垫类型,而暴雨时网垫类型对侵蚀模量的影响明显增加,且采用三维网垫植草护坡时坡面侵蚀模量相比无护坡时减少了5倍左右,三维网垫植草护坡抗冲刷效果明显;由网垫、根系和土组成的坡面浅层加筋土复合体的等效黏聚力随深度的增加总体上呈逐渐减少的趋势,且二者之间呈现三次曲线变化关系;坡面采用厚度大的网垫和植物根系密度较大时都会使坡面浅层土的渗透系数增加。     

公路边坡植被保护的探讨

在研究植物固土护坡功能的基础上，本文还提出了适应东北地区气候的一系列草本、木本等植物，并对其形态、生态特征进行总结归纳，为东北地区的护坡工程的实施提供选择依据。     

生态护坡植物对水质的影响研究

通过模拟植物在流动河水中的生长,测定护坡植物对水中有机物、氮、磷等污染物的吸收作用,分析不同植物的净化效果,优选出合适的护坡植物。结果表明,香根草的COD去除率和TN去除率均最高,狗牙根的TP去除率最高。综合来看,香根草的水质净化效果最好,狗牙根和麦冬的水质净化效果次之。     

合肥地区城市河道生态护坡立体绿化设计研究

城市河道集生态、景观等多重属性于一身,对城市社会、经济发展的推动作用日益显现。生态护坡不仅是河道景观设计的重要部分,也是建构水陆交界生态系统中亟待解决的关键问题之一。以城市河道为研究对象,根据合肥地区的实际情况,阐述了生态护坡立体绿化的概念和结构;提出了植物选择的基本原则、参考植物种类和配置模式;最后提出了维护管理的重点,旨在为城市河道建设提供新的设计思路。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.