Rock Mass Characteristics in Beishan, A Preselected Area for China’s High-Level Radioactive Waste Disposal

Geological and hydrological characteristics, joint geometric features, rock physical and mechanical properties and rock mass quality are studied in the Beishan area, preselected for China’s high-level radioactive waste (HLW) disposal engineering. A comprehensive survey method is developed to study joint geometric features in the outcrop and samples from borehole BS06 into the Xinchang rock mass were tested. The optimal joint sets are determined by rose diagrams and equal-area lower hemisphere plots of joint poles. Results show that: 1) the distribution of joint occurrence obeys a normal distribution, while the distribution of joint spacing obeys a negative exponential distribution; 2) concentric circular and tangent circular sampling windows are applied to study the trace length and the trace midpoint density. Results indicate that tangent circular sampling window is more stable and reasonable; 3) Beishan granite shows high density, low porosity and high strength based on many laboratory tests and the physical properties and mechanical properties are closely related; and 4) a synthesis index, Joint Structure Rating (JSR), is applied to evaluate the quality of rock mass. Through the research results of rock mass characteristics, the Xinchang rock mass in the Beishan preselected area has the favorable conditions for China’s HLW disposal repository site.     

袖阀管注浆在人工填土暗挖施工中的应用

阜石路分洪暗涵某暗挖段,浅涵暗挖洞身大部位于人工填土内,部分区域洞底人工填土厚度仍达2m。人工填土松散,自稳能力差,易发生塌落现象,不易成洞,施工难度大。为避免暗挖施工期间人工填土产生安全隐患并减少后期隧道变形,采用了袖阀管注浆技术对填土地层进行注浆加固,以确保工程施工安全及隧道工程质量&根据工程实施效果可见,袖阀管注浆加固对在人工填土中进行暗挖隧道开挖的沉降、变形控制的效果较好。     

绿色金融如何影响中国城市环境污染？——以雾霾污染为例

文章将绿色金融纳入环境规制的分析框架,以2016－2019年中国289个地级以上城市雾霾污染为例,使用空间杜宾模型探讨绿色金融、环境规制、产业结构、技术水平对雾霾治理的影响,侧重分析了绿色金融与其他因素的交互作用。结果表明：绿色金融具有空间溢出效应,本地绿色金融可以降低周边地区雾霾污染;绿色金融能够与环境规制协同互补,以优化产业结构、提升技术水平的方式促成雾霾治理。绿色金融的结构效应弱于环境规制,在中部地区并不显著;绿色金融的技术效应强于环境规制,能够激励不同地区技术创新。文章启示,绿色金融与环境规制能够相互增益,应建立区域间绿色金融合作机制,增强绿色金融的普惠性,助力区域产业转型和污染治理。     

A new method for GLONASS inter-frequency bias estimation based on long baselines

GPS Solutions - Frequency division multiplexing of GLONASS signals causes inter-frequency bias (IFB) in receiving equipment. IFB significantly increases the difficulties of fixing GLONASS...     

京津冀城市群大气污染的时空特征与影响因素解析

京津冀城市群是中国雾霾最严重的区域,在京津冀协同发展背景下,探究该地区大气污染的时空分布和影响因素具有重要意义。运用空间自相关分析和三种空间计量模型,分析了京津冀202个区县PM_2.5的时空分异特征,创新性地对自然与人文影响因素贡献及其空间溢出效应进行系统地甄别和量化。结果表明：2000-2014年来京津冀城市群PM_2.5浓度整体呈上升趋势,季节上呈秋冬高、春夏低,空间上呈东南高、西北低的特点,且城市建成区PM_2.5浓度比周围郊区和农村平均高10~20 μg/m³;2014年仅有13.9%的区县空气质量达标,PM_2.5浓度存在显著的空间集聚性与扩散性,城市间交互影响距离平均为200 km,邻近地区的PM_2.5每升高1%,将导致本地PM_2.5至少升高0.5%;社会经济内因对PM_2.5主要是正向影响,自然外因主要是负向影响;影响因素中对本地大气污染的直接效应贡献强度依次是：年均风速>年均气温>人口密度>地形起伏度>第二产业占比>能源消费>植被覆盖度,人均GDP、年降水量和相对湿度对本地PM_2.5没有显著影响;对邻近地区大气污染具有显著空间溢出效应的因素排序是：植被覆盖度>地形起伏度>能源消费>人口密度;对于自然和人文影响因素应分别采取针对性的适应策略和调控策略,加强区域间联防联控与合作治理,在城市群规划中注重环保规划与立法。     

The Quadrennial Ozone Symposium 2016

<正>1.Overview The 2016 Quadrennial Ozone Symposium(QOS-2016)was held on 4–9 September 2016 in Edinburgh,UK.The Symposium was organized by the International Ozone Commission(IO3C),the NERC Centre for EcologyHydrology and the University of Edinburgh,and was co-sponsored by the International Union of Geodesy and Geophysics,the International Association of Meteorology and Atmospheric     

城市化对上海的增温效应

上海城市热岛效应很强, 并对气温增暖产生影响。利用主成份分析法从上海及其从近到远的４ 个郊县的２９ 年月平均温度资料中,提炼出影响上海气温变暖的两个主要因子：城市化影响和区域气候变化, 并从而推算出２９ 年来城市化使上海年平均温度增加约０．２０℃, 若排除郊区城镇化因子的影响后, 该值将更高一些。     

江汉平原沔城M1孔的沉积特征与古环境重建

通过对江汉平原沔城M₁孔湖泊沉积物进行沉积特征、粒度、14C年代、孢粉分析,重建了晚冰期以来该地区古环境、古气候演化的过程和序列:晚冰期后期有一扩张期,气候温湿并出现湖泊相沉积;晚冰期末期气候温凉偏干、河流环境;全新世初期(10-8.9kaBP),气候转向温湿;全新世大暖期(8.9-3.5kaBP),总体上气候温暖湿润,其中6.8-4.9kaBP是最宜期,4.9-4.8kaBP和4.4-4.2kaBP为两次降温事件,4.8kaBP积水湖盆开始形成,3.9-3.5kaBP为云梦泽鼎盛期;全新世晚期(3.5-1.7kaBP),气温较大暖期有所下降,其中3.5-2.5kaBP温凉偏湿,2.5-1.7kaBP较为温湿,湖泊较为稳定,1.7kaBP开始,云梦泽萎缩,钻孔所在位置出露水面。      

Chronostratigraphic Subdivision and Correlation of the Permian in China

Since the principle of multiple stratigraphic classification has been widely accepted by Chinese stratigraphers, various new Permian chronostratigraphic units have been proposed in China, and they need to be redefined. The establishment of a new global chronostratigraphic scheme of the Permian, compilation of Permian lithostratigraphic units and updating of Permian biostratigraphic sequences of China makes it possible to present a revised regional chronostratigraphic succession for the Permian System in China. This succession consists of three series and eight stages. The Chuanshanian Series includes two stages, the Zisongian and the Longlinian; the Yanghsinian (Yangxinian) Series is subdivided into the Chihsian (Qixiaan) and the Maokouan Subseries, of which the former comprises the Luodianian and the Xiangboan Stage, and the latter the Kufengian (Gufengian) and the Lengwuan Stage; the Lopingian (Lepingian) Series includes the Wuchiapingian (Wujiapingian) and the Changhsingian (Changxingian) Stage.     

秦岭环斑花岗岩的年代学研究及其意义

本文对秦岭环斑花岗岩带进行了系统的测年工作,通过对实测Ｕ－Ｐｂ,Ｒｂ－Ｓｒ,＾４０Ａｒ／＾３９Ａｒ年龄测定结果研究,认为２１０－２１７Ｍａ是秦岭造山带主造山阶段结束的时间,为秦岭主造山期结束提供了确切的语气具有重要的科学意义。