Erratum to:Schumann resonance observation in China and anomalous disturbance possibly associated with Tohoku M9.0 earthquake     

Xinyan Ouyang  Xuemin Zhang  A.P.Nickolaenko  M.Hayakawa  Xuhui Shen  Yuanqing Miao 《地震学报(英文版)》2014,(3)

正Erratum to:Earthq Sci(2013)26(2):137–145DOI 10.1007/s11589-013-0009-0In the published article,first author’s name was misspelt.The correct name appears in this erratum.  相似文献   

Physiological disturbance of the Manila clam,Ruditapes philippinarum,by altered environmental conditions in a tidal flat on the west coast of Korea     

《Marine pollution bulletin》2014,78(1-2):137-145

To examine the influence of habitat alteration by tideflat reclamation on the physiological ecology of Ruditapes philippinarum, seasonal variations in its condition, gross biochemical composition, and reproductive cycle were compared for a yearly cycle between a reclaimed flat (Gomsohang, GS) and a natural flat (Hajun, HJ) in Gomso Bay, Korea. Concentrations of chlorophyll a and seston (as well as its energy value as food available to the clam) were consistently higher at HJ than at GS. Condition, dry tissue weight, and energy reserves (proteins and carbohydrates) of the clams were much higher at HJ than at GS during spring–summer, when fast growth and gametogenic development occur. Furthermore, their spring gametogenic development and spawning were advanced at HJ compared with GS. Our results suggest that the Manila clam encounters nutritionally stressful environmental conditions in altered habitats after tideflat reclamation that lead to lowered nutrient accumulation and a changing reproductive cycle.  相似文献   

水泥土搅拌桩施工扰动评价的一种方法   总被引：2，自引：0，他引：2  

邓永锋  刘松玉  洪振舜 《岩土力学》2009,30(3):717-720

水泥土搅拌桩广泛应用于高速公路软土处理工程中,但是在工程实践中发现水泥土搅拌桩施工会对桩周土产生扰动使地基土强度降低从而导致路基路面产生开裂。水泥土搅拌桩这类非挤土桩其施工扰动方面研究比较少,为此展开水泥土搅拌桩施工对桩周土的扰动研究。围绕水泥土搅拌桩施工性状,采用圆孔扩张理论分析了施工过程中桩周土受力,采用Sekiguchi和Ohta（关口-太田）模型计算了桩周土体积应变,根据Hong和Onitsuka扰动度的定义得到了搅拌桩施工桩周土的扰动度变化。结果表明水泥土搅拌桩施工对桩周土的扰动随深度的增大和距桩边距离增大而减小,该分析结果与静力触探现场测试得到的锥尖阻力变化规律一致。  相似文献   

深部岩柱在动态扰动下力学响应的数值模拟   总被引：1，自引：0，他引：1  

隋斌  朱维申  李树忱 《岩土力学》2009,30(8):2501-2505

在复杂应力状态下对深部岩柱动态扰动的力学响应进行了数值模拟。通过改变侧压系数,来改变岩柱所受的地应力状态,进而分析不同应力状态下岩柱对外界动力扰动的力学响应;通过改变动态扰动的作用时间,来分析动态扰动时间的变化对处于不同应力状态下的岩柱稳定性的影响。数值模拟结果表明,动态扰动对巷道岩柱破坏的触发与岩柱所处的地应力状态密切相关,侧压系数越小,外界的动态扰动对其影响就越明显。动态扰动的作用时间也是影响巷道岩柱稳定的重要因素,随着应力波作用时间的延长,动态扰动给巷道稳定性带来的影响越大。  相似文献   

�α��쳣����Ź�ϵ������ʶ   总被引：4，自引：0，他引：4  

薄万举 《大地测量与地球动力学》2010,30(1):5-8

??7?ξ???α???????о???????? 1)????α?????????????????仯????????????????α?????????????????仯??????????3???????????4????????????ж??????α?????? 2)?α??????????棻 ????3)?α????????????????????????????????α??????????????????????????????α???????????????????????????ж??????????????? ???? 4????????????????ж??????????????????α???????α????????????????????  相似文献   

大气降水对数字化地倾斜观测干扰特征分析   总被引：5，自引：0，他引：5  

孙伶俐  罗俊秋  龙涛 《大地测量与地球动力学》2010,30(Z1)

对武汉基准地震台倾斜固体潮观测资料的研究表明,固体潮曲线畸变是降雨渗透使基岩膨胀的结果。降雨对记录曲线的影响主要表现在:1)时间上具有同步效应。降雨发生后倾斜仪的NS分量发生南倾,EW分量发生东倾;2)量级上受降雨干扰严重的主要为NS分量,EW分量受干扰程度较轻;3)垂直摆受降雨的干扰程度比水管仪的大。  相似文献   

干旱区生物土壤结皮对种子植物多样性的影响   总被引：21，自引：13，他引：8  

陈荣毅  魏文寿  张元明  吴楠  张静 《中国沙漠》2008,28(5):868-873

通过调查古尔班通古特沙漠筑路形成的严重干扰样方与自然状态下轻微干扰样方种子植物多样性的差异,结合人为干扰生物土壤结皮样方的结果,综合生物土壤结皮土壤种子库、结皮上种子萌发、生长以及土壤养分与水分的特征,研究生物土壤结皮对种子植物多样性的影响。结果表明：完整结皮与适度干扰后结皮样方内植物多样性指数D分别为0.3296和0.5291,多样性指数H分别为0.8400和1.2957,差异均达到显著水平;严重干扰样方的多样性指数D和多样性指数H均显著低于轻度干扰样方的对应指标。说明对生物土壤结皮 “适度”干扰使其保持在早期发育阶段有利于增加种子植物多样性,而“严重”干扰使结皮变为流沙阶段会降低种子植物多样性。结皮影响种子植物多样性的机理主要在于发育后期的生物土壤结皮会降低土壤种子库,也会抑制多数种类种子萌发,夏秋季结皮深层土壤水分的减少也不利于深根植物的生存,但结皮土壤拥有相对较高的养分条件却能保证一年生短命植物生长和生存。相对于流沙,生物土壤结皮的存在有益于保持相对较高的植物多样性,这可能归功于生物土壤结皮有利于地表稳定性、以及其在防风蚀和土壤形成等方面重要的生态功能,因而,在采取 “适度”干扰措施以提高植物多样性之前需要慎重考虑可能带来的不利影响。  相似文献   

葛洲坝-南桥直流输电线路对地磁台的影响   总被引：2，自引：0，他引：2  

郝长安  赵伦  倪友忠  陈军  杨其明 《地震地磁观测与研究》2008,29(5):9-15

从20世纪80年代后期开始,佘山地震台的垂直分量Z受到类似突跳的电磁干扰,最大可达十几个nT,干扰持续时间没有规律,少则几小时,多则几天,经查,干扰来自葛洲坝-南桥直流输电系统,且影响范围广泛,佘山地震台只是其中一个台站。因此,有必要对此进行研究,弄清其干扰机制,探讨采用计算的方法以确定其干扰幅值的可能性。  相似文献   

宽带地震仪资料证实汶川大地震“震前重力扰动”   总被引：16，自引：6，他引：10       下载免费PDF全文

郝晓光  胡小刚 《地球物理学进展》2008,23(4):1332-1335

在武汉大地测量国家野外科学观测站LacosteET重力仪资料中发现汶川大地震"震前扰动"现象之后,又在全国数十个台站宽带地震仪资料中发现了汶川大地震的"震前扰动".和LacosteET重力仪观测到的"震前扰动"一样,宽带地震仪资料的"震前扰动"也是在震前两天开始并逐渐增大,一直持续到汶川大地震发生,信号周期也是4～8 s.  相似文献   

Ionospheric response to geomagnetic disturbances in the north-eastern region of Asia during the minimum of 23rd cycle of solar activity     

V.I. Kurkin  O.M. Pirog  N.M. Polekh  A.V. Mikhalev  I.N. Poddelsky  A.E. Stepanov 《Journal of Atmospheric and Solar》2008,70(18):2346-2357

We present the results of studies of the subauroral and mid-latitude ionosphere variations in the north-eastern region of Asia. We used the data from network of vertical and oblique-incidence sounding ionosondes and optical measurements. Long-term experiments on the radio paths Magadan–Irkutsk and Norilsk–Irkutsk were carried out within the period 2005–2007. Vertical sounding stations operated in standard regime. Observation of airglow near Irkutsk was provided by the zenith photometer that measured intensities of 557.7 and 630.0 nm atomic oxygen emissions. The results may be summarized as follows. (1) Large daytime negative disturbances are observed during the main and recovery phases mainly at high latitudes, whereas the positive disturbances observed during the main phase at mid latitudes. The disturbances changed their sign between Yakutsk and Irkutsk. (2) During the main and recovery storm phases the fall of foF2 associated with the equatorward wall of the main ionospheric trough is observed in the afternoon and evening. (3) Fluctuations of the electron density more intensive at mid latitudes during the storm main phase are observed during all considered periods. They are classed as traveling ionospheric disturbances (TID). Such sharp gradients of electron density are responsible for the strong changes in the characteristics of the radio wave propagation, particularity MOF. (4) A large-scale ionospheric disturbance is noted at the meridional chain of ionosonds in December 2006 as the sharp increase of foF2. It appears in the evening in the minimum of D_st at high latitude and propagate to equator. (5) A maximum of 630 nm emission above Irkutsk corresponds to the foF2 increase. (6) The obtained experimental data on the net of vertical and oblique-incidence sounding with high time resolution show that such net is the effective facility to study the conditions of the radio wave propagation and can be used for the diagnostic of the ionosphere.  相似文献