Trend and Interannual Variability of Chinese Air Pollution since 2000 in Association with Socioeconomic Development: A brief Overview          下载免费PDF全文

LIN Jin-Tai  PAN D  ZHANG Rui-Xiong 《大气和海洋科学快报》2013,6(2):84-89

air pollution, trend and variability, socioeconomic development, satellite measurements, bottom-up emission inventories, top-down constraints  相似文献   

Episodic Mass Loss and Rapid Lithium Enrichment and Depletion in K Giants     

R. De La Reza  N.A. Drake  L. Da Silva 《Astrophysics and Space Science》1997,255(1-2):251-292

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Anomalous X-ray pulsars: persistent states with fallback disks     

Ü. Ertan  M. A. Alpar  M. H. Erkut  K. Y. Ekşi  Ş. Çalışkan 《Astrophysics and Space Science》2007,308(1-4):73-77

The anomalous X-ray pulsar 4U 0142+61 was recently detected in the mid infrared bands with the SPITZER Observatory (Wang, Chakrabarty and Kaplan: Nature 440, 772 (2006)). This observation is the first instance for a disk around an AXP. From a reanalysis of optical and infrared data, we show that the observations indicate that the disk is likely to be an active disk rather than a passive dust disk beyond the light cylinder, as proposed in the discovering paper. Furthermore, we show that the irradiated accretion disk model can also account for all the optical and infrared observations of the anomalous X-ray pulsars in the persistent state.  相似文献   

Influence of the resonance in a gravity-gradient stabilized satellite     

R. Vilhena De Moraes  P. A. F. Da Silva 《Celestial Mechanics and Dynamical Astronomy》1989,47(3):225-243

Using Hamiltonian formalism the translational-rotational motion of a satellite is studied near a resonance considering the orbital and rotational motions. A first order perturbation theory is derived by Hori's transformation in order to eliminate short and long periodic terms, preserving in the new Hamiltonian secular and resonant terms. This theory is again applied to study the resonant system whose analysis lead us to a system of equations equivalent to the equations of a simple pendulum which is integrable in terms of elliptical integrals.  相似文献   

Analysis of the Devonian (Frasnian) platform from Belgium: a multi‐faceted approach for basin evolution reconstruction     

Anne‐Christine Da Silva  Frédéric Boulvain 《Basin Research》2012,24(3):338-356

This study undertakes a multi‐disciplinary approach (sedimentology, carbon isotopes, magnetic susceptibility and thickness distribution) to improve understanding of a major Palaeozoic carbonate platform, the Frasnian platform of Belgium. These combined techniques are used to reconstruct the platform history, which evolved in two main steps. During the first phase, the basin was strongly influenced by faulting, producing notable thickness and facies variations, with open ocean conditions, with good water circulation and no/or limited barrier reef. The second phase of platform development was less influenced by differential subsidence, as indicated by homogeneous facies distribution. However, this platform developed under restricted waters, with low circulation which is likely related to the development of a barrier reef.  相似文献   

A numerical method of combined SPF-MEM-LBM on the rockfall-induced surge and its application     

MENG Qiu-jie  SONG Yi-xiang  HUANG Da  HUANG Run-qiu  ZHONG Zhu  HUANG Wen-bo  LIU Yang 《山地科学学报》2022,(1):167-183

Rockfalls in reservoirs are prone to induce surges,posing a severe threat to passing vessels and facilities.A scheme combined Single-phase free-surface method (...  相似文献   

3维直角坐标系直接转换算法的研究与实现     

刘达  韩晓冰  房龙 《东北测绘》2012,(5):175-178,182

测绘工作中经常碰到3维直角坐标系的3维转换问题,本文通过简单的几何平移旋转缩放算法,对3维十六参数的直角坐标系变换,进行了理论描述和几何证明以及数据验证。  相似文献   

可穿戴调绘记录仪研究     

刘达  刘晶东  房龙  别帅  张涛 《测绘与空间地理信息》2018,(6):51-52,55

调绘是测绘生产中的重要工序。本文提出的可穿戴调绘记录仪能够实时记录视频、音频信息和GNSS轨迹坐标,并可响应语音命令,播报当前位置要素信息。该系统解决了平板调绘等操作不便的问题,解放了作业人员的双手,最大限度地保留了调绘时看到的信息,不需要质检人员到实地查看,节省了调绘作业的成本。  相似文献   

铜陵新桥铁矿田地质地球化学特征及成因浅析   总被引：3，自引：0，他引：3  

臧文拴  吴淦国  张达  刘爱华 《大地构造与成矿学》2004,28(2):187-193

长期以来有关新桥 (S Fe Cu)矿田的成因一直争论不休 ,如沉积 -改造型、层控 -矽卡岩型、海底喷流沉积型等。作者在综合分析该矿田的地质 -地球化学特征的基础上 ,认为新桥矿田具有二期成矿作用的特点。早期沉积成矿作用形成菱铁矿矿体和不具有工业意义的黄铁矿层。后期岩浆成矿作用形成层状、似层状块状硫化物型、热接触交代矽卡岩型和热液脉型等不同类型的硫化物矿体。沉积作用形成的矿体与岩浆作用形成的矿体各自有着不同的地球化学特征  相似文献   

上硬下软反倾边坡开挖变形响应的物理模拟          下载免费PDF全文

郑达  毛峰  王沁沅  苏杭  李文龙 《水文地质工程地质》2019,(5):89-95

现有上硬下软边坡的研究大都集中在压缩挤出变形的近水平泥岩、页岩基座型边坡变形演化过程,针对倾倒变形的板岩基座型边坡开挖响应研究甚少,本文以西藏玉曲河某水电站厂址边坡为研究对象,根据现场地质调查建立符合坡体实际情况的地质结构模型,采用物理试验的方法模拟原型边坡开挖。通过试验揭示上硬下软反倾边坡在开挖条件下的变形响应特征及破坏模式。研究结果表明:（1）开挖条件下上硬下软型边坡变形破坏过程分为a）下部软岩倾倒弯曲加剧;b）软岩倾倒折断,上部卸荷硬岩沿已有裂隙剪切;c）倾倒软岩滑移,卸荷硬岩剪断岩性分界部位,折断面贯通3个阶段。其变形破坏模式为下部软岩倾倒—上部硬岩剪断组合滑移型破坏;（2）开挖强倾倒区岩体会使下部软岩迅速失稳并促使上部硬岩剪切破坏;开挖引起的反倾上硬下软边坡大变形在短时间内完成,前期变形和能量积累是一个较长的过程;（3）开挖时需避免对坡脚倾倒岩体“大开挖”施工。  相似文献