致灾营力当量定律及其应用     

付恩光  王心兵  张景康  胡玉禄  沙令宝 《山东国土资源》2007,23(5):21-23

通过重力滑块模型和已发灾害规律研究,总结发现了致灾营力当量定律,揭示了降雨引发的地质灾害发灾规律,明确表达了灾害发生时内致灾营力当量与降雨致灾营力当量值的需求关系。该定律成功应用于内外致灾营力当量的归一化处理,为地质灾害气象预报预警级别划分找到了理论依据。  相似文献   

膨润土防潮粘结剂的研制     

钟峻科 《南方国土资源》1997,(4)

文章介绍了膨润土防潮助剂的制备原理及制备要点。对膨润土防潮淀粉粘合剂生产所需的各种原材料性能作用进行了分析。并详细介绍了一种工艺简便设备简单及经济效益好的膨润土防潮粘结剂的生产方法。  相似文献   

冬季亚澳季风环流的低频耦合过程     

何金海  王坚红  苗春生 《热带气象学报》1993,9(3):193-201

利用1982—1983年和1984—1985年两个冬季的欧洲中期预报中心格点资料研究了冬季东亚西风急流与澳大利亚夏季风在低频尺度上的相互作用与可能的传播方式。结果表明,我国北部上空的西风急流(及相应的锋区)与澳大利亚的夏季风的低频变化有很好的一致性。它们的联系和相互作用表现为:东亚西风急流通过改变西北太平洋地区的越赤道气流影响澳大利亚夏季风的低频变化,而澳大利亚夏季风则通过增强或减弱的高空辐散向北气流影响东亚西风急流。将这种相互作用称为亚澳季风环流的“低频耦合过程”。  相似文献   

A NUMERICAL STUDY ON THE INFLUENCE OF WIND FIELDS AT UPPER LEVELS IN THE MEIYU PERIOD ON THE DEVELOPMENT OF LOW LEVEL JET AND MESOSCALE SYSTEMS          下载免费PDF全文

翟国庆  高坤  孙淑清 《Acta Meteorologica Sinica》1998,(1)

Using a mesoscale model,a numerical study on a heavy rainfall case occurring in theChangjiang-Huaihe River Basin is made in this paper.The influence of the intensity ofnortheasterly wind in front of the Qinghai-Xizang high at upper level on the low level wind fieldand development of mesoscale systems as well as heavy rainfall is investigated.The model wellreproduced the heavy rainfall process and the weather systems associated.And it indicates that thestrong northeasterly flow around the high at upper troposphere will bring about not only thestrengthening of low level southeasterly wind,but also the appearance of shear-line and mesoscalevortex at low level.The coupling of northerly wind at upper level and southerly wind at lowerlevel constructs a vertical indirect circulation which is most favourable for the development ofconvective motions.Its ascending branch in the shear-line area is very strong and shows apronounced mesoscale characteristic.  相似文献   

HH—1886型特效中温黑色磷化液的研制   总被引：3，自引：0，他引：3  

唐林  马艳珉 《铀矿地质》1998,14(6):370-376

本文阐述了以磷酸锌盐和钙盐为基本原料,以硝酸盐和自制的AN促进剂为磷化复合促进剂,以有机酸为稳定剂,以含氯化合物为填料,添加有关添加剂,组成一种集磷化和钝化为一体的特效中温黑色磷化液。这种磷化液具有磷化温度适中（60—70℃）、磷化时间较短（10—15min）、磷化膜呈黑色且耐腐蚀性能强（硫酸铜点滴20—26min不变色）、沉渣量极少等特点。这种磷化液适用于各种中低碳钢、合金钢的防锈黑色磷化,特别适用于铁路轴承、机车部件等耐腐蚀和装饰性磷化。  相似文献   

大孔树脂催化合成增塑剂DBP的研究   总被引：3，自引：0，他引：3  

杨志成 《华东地质学院学报》1998,21(2):171-177

本文论述了以功能树脂ＤＯＯＸ为催化剂,邻苯二甲酸酐和正丁醇为原料合成邻苯二甲酸二丁酯的新方法。实验表明,该催化剂具有活性高、选择性好、工艺流程简单、催化剂易回收并可重复使用等优点。在最佳工艺条件下,酯产率可达９０％以上。本方法无环境污染,易于工业化生产。  相似文献   

改性粘土增强硅橡胶性能的研究   总被引：1，自引：0，他引：1  

魏从容  吴季怀  沈振 《矿物岩石地球化学通报》1998,(3)

改性粘土增强硅橡胶性能的研究魏从容吴季怀沈振（华侨大学材料物理化学研究所,泉州３６２０１１）关键词粘土矿物质表面改性硅橡胶增强剂粘土矿物作硅橡胶增强剂是粘土综合开发利用的新课题,我们在这方面取得一定的成果［１］。但是,未经改性处理的粘土其增强能力是有...  相似文献   

The frequency and distribution of recent landslides in three montane tropical regions of Puerto Rico   总被引：12，自引：0，他引：12  

Matthew C. Larsen  Angel J. Torres-Snchez 《Geomorphology》1998,24(4):309-331

Landslides are common in steep mountainous areas of Puerto Rico where mean annual rainfall and the frequency of intense storms are high. Each year, landslides cause extensive damage to property and occasionally result in loss of life. Average population density is high, 422 people/km², and is increasing. This increase in population density is accompanied by growing stress on the natural environment and physical infrastructure. As a result, human populations are more vulnerable to landslide hazards. The Blanco, Cibuco, and Coamo study areas range in surface area from 276 to 350 km² and represent the climatologic, geographic, and geologic conditions that typify Puerto Rico. Maps of recent landslides developed from 1:20,000-scale aerial photographs, in combination with a computerized geographic information system, were used to evaluate the frequency and distribution of shallow landslides in these areas. Several types of landslides were documented—rainfall-triggered debris flows, shallow soil slips, and slumps were most abundant. Hillslopes in the study area that have been anthropogenically modified, exceed 12° in gradient, are greater than 300 m in elevation, and face the east-northeast, are most prone to landsliding. A set of simplified matrices representing geographic conditions in the three study areas was developed and provides a basis for the estimation of the spatial controls on the frequency of landslides in Puerto Rico. This approach is an example of an analysis of the frequency of landslides that is computationally simple, and therefore, may be easily transferable to other settings.  相似文献   

Deformation of the Japanese Islands and seismic coupling: an interpretation based on GSI permanent GPS observations   总被引：2，自引：0，他引：2  

Xavier Le Pichon  Stéphane Mazzotti  Pierre Henry  & Manabu Hashimoto 《Geophysical Journal International》1998,134(2):501-514

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掺入膨胀剂桩受力机理的试验研究   总被引：1，自引：1，他引：0  

崔江余  郭永刚 《岩土力学》1998,19(2):49-53

对掺入膨胀剂的混凝土灌注桩受力机理进行了试验研究,通过对几组普通桩（不掺膨胀剂）和掺入膨胀剂的混凝土灌注桩试验结果分析,发现由于膨胀剂的膨胀作用,使灌注桩的承载性能发生了较大的变化,桩侧摩阻力和桩端阻力均得到提高;在相同荷载作用下,掺入膨胀剂的桩可明显减小桩顶沉降量,并使桩端阻力得以提前发挥。  相似文献