改进的传染型余震序列模型

将有限幂律公式（LPL）应用到传染型余震序列模型（ETAS）中，并对原ETAS模型加以改进。以台湾集集地震早期余震序列为例，对原ETAS模型与改进的ETAS模型进行了对比分析，结果表明改进的ETAS模型要优于原ETAS模型。     

基于实测值分段线性内插模型的InSAR视线向同震位错分解-以青藏高原昆仑山MemＳsub8.1地震为例x,auto,auto,415px);}stylehf=httprztl.com business week launch

利用现场GPS定位的实测值，在尝试过最小二乘拟合并取得初步成果的基础上，进而采用更符合破裂带形态的线性立方插值函数，在破裂带主断面上，建立起一种理论与实测相结合的InSAR视线向(LOS)变化量的分解方程，得到了InSAR视线向位移分解的具有唯一性的解析解. 本文的解析法吸纳了GPS定点实测值的精度优势，利用InSAR全天候、准实时获取连续形变场的技术特点，通过数学近似，最终获得了主破裂带上连续变化的水平位错及垂直位错同震形变曲线.      

河南省气象服务短信平台

介绍了河南省气象短信运营平台的特点、结构和各模块的功能。     

Study on Statistical Features About Weak Earthquake Activity Before Moderately Strong Earthquakes in the Middle Northern Part of the Qinghai-Xizang （Tibet） Block

In regards to the earthquakes recording M ≥ 5.0 that occurred in middle northern part of the Qinghai-Xizang （Tibet） Block from 1970 - 2003, in this study we describe the temporal and spatial centralization features of the weak earthquakes and the enhancement and anomalous quiescence of their seismic activity before main shocks through 4 parameters, which are basically not correlated： earthquake time centralization degree parameter Ct, earthquake space centralization degree parameter Cd, η value and weak earthquake frequency and so on. On the basis of calculation results, it has been seen that before earthquakes with M ≥ 5.0 took place in the middle northern part of the Qinghal-Xizang （Tibet） Block, the frequency of weak earthquakes often shows ascent and drop, their strength shows an obvious enhancement and the centralization distribution with time and space is evident.     

中国石油大厦复合土钉支护现场监测与分析

桩锚与土钉复合支护在国内得到广泛地应用,但其分析理论和设计方法尚欠不足,实践远超过理论。结合北京中国石油大厦深基坑支护工程,介绍了桩锚-土钉复合支护内力的监测方案。通过对复合土钉支护中桩、锚杆、土钉受力的现场测试和分析,研究了桩锚-土钉复合支护各部分的受力机理,对深入认识桩锚-土钉复合支护的受力机理和桩锚-土钉复合支护结构的优化设计提供参考。     

神农架大九湖15.753kaB.P.以来的孢粉记录和环境演变*

根据对大九湖297cm厚的泥炭地层10个AMS ¹⁴ C年龄的测定以及148块孢粉样品的分析,发现每块样品的孢粉(浓度)含量都很高,植物种类繁多,分属于137(科)属,可划分为6个孢粉组合带,植被类型演替大体为:含少量常绿树种的针阔叶混交林—含常绿阔叶树种的落叶阔叶林—常绿落叶阔叶林—含常绿阔叶树种的落叶阔叶林—含少量常绿树种的针阔叶混交林。孢粉带Ⅰ(15.753~11.280kaB.P.)记录了该区域晚冰期及其向全新世过渡时期冷暖波动频繁的气候条件,其中亚带Ⅰ -1(15.753~15.549kaB.P.),Ⅰ -3(14.936~14.505kaB.P.)和Ⅰ -5(12.655~11.280kaB.P.)可能分别对应最老仙女木期、老仙女木和新仙女木冷期,而亚带Ⅰ -2(15.549~14.936kaB.P.)和Ⅰ -4(14.505~12.655kaB.P.)分别对应博令和阿勒罗德暖期。孢粉带Ⅱ(11.280~9.218kaB.P.)代表了由晚冰期冷湿气候向全新世温暖气候转换的早全新世缓慢升温的过渡时期。孢粉带Ⅲ(9.218~7.530kaB.P.)代表中全新世前期的气温波动上升期,7.7kaB.P.前后达到最高温。孢粉带Ⅳ(7.530~4.051kaB.P.)代表中全新世适宜期,水热配置条件最佳。孢粉带Ⅴ(4.051~0.911kaB.P.)体现晚全新世温干的气候。孢粉带Ⅵ(0.911~0kaB.P)反映了大九湖温凉稍湿的气候。     

Sulfate Attack on Concrete in an Inland Salt Lake Environment

INTRODUCTIONSulfate attack is one of the reasons for concretestructures deteriorating earlier than usual,thusshowing poor durability.The SO42-from the sur-rounding environment such as ocean,saline,groundwater,and even the concrete itself,reacts with thehydration products of cement,whichleads to the de-terioration of the concrete(Li et al.,2000;Kang,1995;Neville,1983;Samarai,1976).The deteriora-tionincludes three processes:the external swelling,cracking,peeling,and disjointing caused by …     

北京沙河地区地面沉降及抗浮设防水位的探讨

论述了北京沙河高教园区项目在建设中将遇到的地面沉降及抗浮设防水位的确定问题,并提出了相应的解决措施。     

Early cretaceous granitoids and their implications for the collapse of the Dabie orogen, eastern China: SHRIMP zircon U–Pb dating and geochemistry

Two stages of early Cretaceous post-orogenic granitoids are recognized in the Dabie orogen, eastern China, which recorded processes of extensional collapse of the orogen. The early stage granitoids ( 132 Ma) are foliated hornblende quartz monzonites and porphyritic monzogranites. They are of high-K calc-alkaline series and metaluminous to weakly peraluminous, with high K₂O and low MgO contents (Mg^# values: 32.0–46.0), they contain high Sr, low Y and heavy rare earth elements (HREE), and have high Sr/Y and (La/Yb)_N ratios, without clear negative Eu, Sr and Ti anomalies. The early stage deformed granitoids have adakitic geochemical compositions and are equilibrated with residues rich in garnet and poor in anorthite-rich plagioclase, and thus indicate the existence of an over-thickened (> 50 km) crustal root beneath the orogen at  132 Ma. The later stage granitoids ( 128 Ma) are undeformed fine-grained monzogranites, fine-grained K-feldspar granites and coarse-grained K-feldspar granite-porphyry. They belong to a peraluminous and high-K calc-alkaline to shoshonite series, and display a flat HREE pattern and have strong negative Eu, Sr and Ti anomalies, with low Sr/Y and (La/Yb)_N ratios. The late stage granitoids are equilibrated with residues rich in anorthite-rich plagioclase, hornblende, ilmenite/titanite and poor in garnet, indicating that the crust of the Dabie orogen became thinner (< 35 km) at  128 Ma. SHRIMP zircon U–Pb ages and changing compositional trends for these two stages of granitoids indicate that the over-thickened crust formed by the Triassic continental subduction/collision under the Dabie orogen remained until the early Cretaceous, and collapsed quickly in a few million years during the early Cretaceous.