国内旅游文化开发研究综述   总被引：6，自引：0，他引：6  

赵飞  彭华  姚静 《云南地理环境研究》2004,16(2):48-52

旅游文化是一种重要的旅游资源。是旅游地可持续发展的源泉。在旅游地开发过程中，文化事项如何转化为旅游产品，即旅游文化开发是一个极具实际应用价值的研究课题。目前，国内对于旅游文化开发的研究还没有能够形成一个完整的理论研究体系，并且缺少成熟的研究方法，具体到实践中可操作性还比较弱。在查阅了国内近20年中的众多相关研究文献的基础上，试图从应用理论、开发实践、方法探索3个方面对国内的旅游文化开发研究做一个系统的总结。  相似文献   

南岗排旅游区文化资源开发研究     

赵飞  彭华  邱燕 《云南地理环境研究》2004,16(4):52-55

旅游文化是一种重要的旅游资源，是旅游区实现可持续发展的源泉。位于粤北连南瑶族自治县的南岗排是一个具有上千年历史的排瑶村落，至今仍保存着大量的明代与清代遗留下来的文物古迹。对于南岗排的旅游开发，应当积极发掘其丰富的旅游文化资源，并通过精心设计形成旅游产品。南岗排旅游区应以“排瑶村寨风情博物苑”为主题，重点发掘其排瑶民俗文化、宗教文化与历史文化。从文化氛围营造、专项文化开发、文化形象宣传3个方面对南岗排旅游区的文化资源开发做了探讨。  相似文献   

松嫩平原湿地植被对生境干-湿交替的响应   总被引：9，自引：0，他引：9  

田迅  卜兆君  杨允菲  郎惠卿 《湿地科学》2004,2(2):122-127

扎龙湿地和向海湿地水分布存在不均一性，生境中有“干-湿”交替过程。选取“干-湿”界面上沼泽植被与草甸植被共存的群落片断分别设置15个固定样方，生长季内4个月观测结果表明：扎龙湿地和向海湿地生境旱生化时羊草为优势种群，湿生化时芦苇为优势种群，芦苇沼泽群落和羊草草甸群落随生境“干-湿”交替过程相互演替，演替过程既受生境水分波动的影响，又由优势种群内在生物学特性决定。  相似文献   

南半球对流层气候年代际变化及其与太阳活动的联系   总被引：7，自引：0，他引：7  

曲维政  陈璐  黄菲  张微  朱小洁  邓声贵  杜凌 《地球科学进展》2005,20(7):794-803

通过南半球对流层温度场谱分析和逐次滤波分析发现，南半球对流层大气温度场半个多世纪以来呈现明显的持续升温趋势，升温幅度由低层到高层逐步增加，其中地面层1 000 hPa年升温率为0.013℃/a，对流层中部500 hPa年升温率为0.019℃/ a，对流层上部300 hPa年升温率为0.036℃/ a；滤除南半球大气温度场的趋势变化，发现南半球大气温度场从地面层直至对流层顶广泛盛行着十分显著的与太阳磁场磁性22年周期变化相一致的变化周期。太阳磁场磁性周期变化趋势略有超前，分析认为，这是南半球对流层大气气候系统对太阳磁场周期性变化的响应。进一步分析还发现，南半球从地面层1 000 hPa到对流层顶，再到平流层中部10 hPa各层次大气温度变化22年周期分量振荡位相基本一致，周期振幅由低层到高层迅速增大，说明太阳磁场变化对对流层高层比低层影响大，对平流层影响更大。其中地面层1 000 hPa温度场的22年变化周期是在滤除趋势变化和11年周期之后才显现出来的，所以太阳磁场磁性周期变化对地面层气候的影响较小并且经常处于被掩盖状态；南半球地面层1 000 hPa温度场滤除趋势变化之后显示出十分显著的与太阳活动11年周期相一致的变化周期，分析认为，这是南半球对流层大气气候系统对太阳活动11周期性变化的响应。对流层上层300 hPa温度场滤除趋势变化和22年周期之后也显示出11年变化周期，而对流层中部500 hPa则无此周期反应，说明太阳活动11年周期对地面层1 000 hPa大气气候影响最明显，对流层中上层影响较弱。  相似文献   

AHP及模糊综合评判法在路基长期稳定性评价中的应用     

付兵先  唐飞  李天降 《岩土工程技术》2005,19(6):284-286,322

根据对一低液限粉土路基的现场工程地质调查及检测,确定了影响该路基长期稳定性的主要影响因素,并结合AHP法,应用两级模糊综合评判的方法对该路基的长期稳定性进行了评价。  相似文献   

含钒金红石可见光下催化降解亚甲基蓝实验研究   总被引：2，自引：0，他引：2  

杨磊  王长秋  鲁安怀  郭延军  刘菲  马生凤 《地学前缘》2005,12(Z1):184-188

利用含有钒等杂质的金红石可部分吸收可见光的特性,以500 W卤素灯作为光源,实验研究了其对亚甲基蓝的可见光催化降解,结果表明,该金红石具有催化活性,7 h后亚甲基蓝可降解71 2%。经过加热、粉碎改性方法处理后的金红石光催化活性明显提高,加热1 100 ℃的金红石样品7 h后可使亚甲基蓝的降解率达到90 4%。增加光照强度、加入适当的H2O2 都可提高降解效果。实验为充分开发利用天然金红石提出了新的途径,为环境污染治理提出了新方法。  相似文献   

钻孔灌注桩后压浆作用机理与应用     

陈飞  兰凯 《地质科技情报》2005,24(Z1):97-100

通过对桩侧和桩底后压浆,可大幅度提高钻孔灌注桩单桩承载力.应用桩-土理论分析了后压浆中浆液对土体及桩体的作用,并从分析影响桩基承载力的因素出发,研究了后压浆的作用机理.在渗透率小的地层中后压浆以压密注浆为主,在渗透率大的地层中后压浆以渗透注浆为主.为避免过分压裂土层,在压浆过程中应控制灌浆压力.压浆量是影响后压浆质量和提高单桩承载力的关键因素之一.  相似文献   

Polymorphic phase transition in Superhydrous Phase B     

M. Koch-Müller  P. Dera  Y. Fei  H. Hellwig  Z. Liu  J. Van Orman  R. Wirth 《Physics and Chemistry of Minerals》2005,32(5-6):349-361

We synthesized superhydrous phase B (shy-B) at 22 GPa and two different temperatures: 1200°C (LT) and 1400°C (HT) using a multi-anvil apparatus. The samples were investigated by transmission electron microscopy (TEM), single crystal X-ray diffraction, Raman and IR spectroscopy. The IR spectra were collected on polycrystalline thin-films and single crystals using synchrotron radiation, as well as a conventional IR source at ambient conditions and in situ at various pressures (up to 15 GPa) and temperatures (down to −180°C). Our studies show that shy-B exists in two polymorphic forms. As expected from crystal chemistry, the LT polymorph crystallizes in a lower symmetry space group (Pnn2), whereas the HT polymorph assumes a higher symmetry space group (Pnnm). TEM shows that both modifications consist of nearly perfect crystals with almost no lattice defects or inclusions of additional phases. IR spectra taken on polycrystalline thin films exhibit just one symmetric OH band and 29 lattice modes for the HT polymorph in contrast to two intense but asymmetric OH stretching bands and at least 48 lattice modes for the LT sample. The IR spectra differ not only in the number of bands, but also in the response of the bands to changes in pressure. The pressure derivatives for the IR bands are higher for the HT polymorph indicating that the high symmetry form is more compressible than the low symmetry form. Polarized, low-temperature single-crystal IR spectra indicate that in the LT-polymorph extensive ordering occurs not only at the Mg sites but also at the hydrogen sites.  相似文献   

Kimberlite petrogenesis: Insights from clinopyroxene-melt partitioning experiments at 6 GPa in the CaO-MgO-Al₂O₃-SiO₂-CO₂ system     

Shantanu Keshav  Alexandre Corgne  Michael Bizimis  Yingwei Fei 《Geochimica et cosmochimica acta》2005,69(11):2829-2845

In this experimental study, we examine the mineral-melt partitioning of major and trace elements between clinopyroxene and CO₂-rich kimberlitic melts at a pressure of 6 GPa and temperatures of 1410°C and 1430°C. The melts produced contain ∼ 28 wt% dissolved CO₂, and are saturated with olivine and clinopyroxene. To assess the effects of temperature, crystal and melt compositions on trace element partitioning, experiments were performed in the model CaO-MgO-Al₂O₃-SiO₂-CO₂ system. Our results reveal that all the elements studied, except Al, Mg, Si, and Ga, are incompatible in clinopyroxene. Partition coefficients show a considerable range in magnitude, from ∼ 10⁻³ for D_U and D_Ba to ∼ 2.5 for D_Si. The two experimental runs show similar overall partitioning patterns with the D values being lower at 1430°C. Rare earth elements display a wide range of partition coefficients, D_La (0.012-0.026) being approximately one order of magnitude lower than D_Lu (0.18-0.23). Partition coefficients for the 2+ and 3+ cations entering the M2-site exhibit a near-parabolic dependence on radius of the incorporated cations as predicted from the lattice strain model. This underlines the contribution made by the crystal structure toward controlling the distribution of trace elements. Using data obtained in this study combined with that in the published literature, we also discuss the effects that other important parameters, namely, melt composition, pressure, and temperature, could have on partitioning.Our partition coefficients have been used to model the generation of the Group I (GI) kimberlites from South Africa. The numerical modeling shows that kimberlitic melts can be produced by ∼0.5% melting of a MORB-type depleted source that has been enriched by small-degree melts originating from a similar depleted source. This result suggests that the source of GI kimberlites may be located at the lithosphere-asthenosphere transition. Percolation of small degree melts from the asthenosphere would essentially create a metasomatic horizon near the bottom of the non-convecting sublithospheric mantle. Accumulation of such small degree melts together with the presence of volatiles and conductive heating would trigger melting of the ambient mantle and subsequently lead to eruption of kimberlitic melts. Additionally, our model shows that the GI source can be generated by metasomatism of a 2 Ga old MORB source ca. 1 Ga ago. Assuming that MORB-type mantle is the most depleted source of magmas on earth, then this is the oldest age at which the GI source could have existed. However, this age most likely reflects the average age of a series of metasomatic events than that of a single event.  相似文献   

Soil property variation mapping through data mining of soil category maps          下载免费PDF全文

Fei Du  A‐Xing Zhu  Lawrence Band  Jing Liu 《水文研究》2015,29(11):2491-2503

Spatial information on soil properties is an important input to hydrological models. In current hydrological modelling practices, soil property information is often derived from soil category maps by the linking method in which a representative soil property value is linked to each soil polygon. Limited by the area‐class nature of soil category maps, the derived soil property variation is discontinuous and less detailed than high resolution digital terrain or remote sensing data. This research proposed dmSoil, a data‐mining‐based approach to derive continuous and spatially detailed soil property information from soil category maps. First, the soil–environment relationships are extracted through data mining of a soil map. The similarity of the soil at each location to different soil types in the soil map is then estimated using the mined relationships. Prediction of soil property values at each location is made by combining the similarities of the soil at that location to different soil types and the representative soil property values of these soil types. The new approach was applied in the Raffelson Watershed and Pleasant Valley in the Driftless Area of Wisconsin, United States to map soil A horizon texture (in both areas) and depth to soil C horizon (in Pleasant Valley). The property maps from the dmSoil approach capture the spatial gradation and details of soil properties better than those from the linking method. The new approach also shows consistent accuracy improvement at validation points. In addition to the improved performances, the inputs for the dmSoil approach are easy to prepare, and the approach itself is simple to deploy. It provides an effective way to derive better soil property information from soil category maps for hydrological modelling. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献