中国公众对"限塑令"态度的影响因素——以兰州市为例

基于问卷调查和个人访谈,运用路径方法,分析了影响中国公众对限塑令态度的社会心理和社会人口变量.结果表明,社会人口变量中,只有教育与公众对限塑令的态度呈正相关,且社会人口变量只能解释公众对限塑令态度方差的很小一部分.相较而言,社会心理变量能更好解释中国公众对限塑令态度的差异,集体主义价值观和新生态观与限塑令态度呈显著正相...     

深空探测车环境感知与导航定位技术进展与展望

环境感知与导航定位是深空探测车自动驾驶的核心技术,由于深空环境的特殊性,深空探测车的环境感知与导航定位与地球上汽车自动驾驶的相应技术相比面临独特的挑战.本文从实际工程应用和科研进展两个角度总结了深空探测车环境感知、视觉定位、路径规划等关键技术的进展,并对未来深空探测车智能感知与长距离导航定位等发展方向进行了探讨与展望.     

手持式超站仪配合实验形数法测定林分特征参数的原理与方法

利用手持式超站仪配合实验形数法测定林分特征参数的原理与方法,可以迅速精确获得树木树干的胸径、树高、材积、角尺度、混交度、大小比数、林分胸高断面积、林分平均高、林分平均株数、蓄积量和生长量等数据。文章提出了观测五棵树构成样地的森林计测方法,通过实验研究表明,此方法比传统的森林调查技术更加精确和高效。     

Sterile neutrino fits to dark matter mass profiles in the Milky Way and in galaxy clusters

In recent papers it was claimed that SN 1987A data supports the existence of 4.0 eV and 21.4 eV active neutrino mass eigenstates, and it was suggested that such large active neutrino masses could be made consistent with existing constraints including neutrino oscillation data and upper limits on the neutrino flavor state masses. The requirement was that there exist a pair of sterile neutrino mass states nearly degenerate with the active ones, plus a third active-sterile doublet that is tachyonic (m ²<0). Here, independent evidence is presented for the existence of sterile neutrinos with the previously claimed masses based on fits to the dark matter distributions in the Milky Way galaxy and four clusters of galaxies. The fits are in excellent agreement with observations within the uncertainties of the masses. In addition, sterile neutrinos having the suggested masses address the “cusp” problem and the missing satellites problem, as well as that of the “top down” scenario of structure formation—previously a chief drawback of HDM particles. Nevertheless, due to the highly controversial nature of the claim, and the need for two free parameters in the dark matter fits, additional confirming evidence will be required before it can be considered proven.     

Geochemical evidence of paleogeography and paleoclimate during deposition of the 2nd Member of Kongdian Formation in Kongnan area

The 2nd Member of Kongdian Formation has been made up of a large number of oil shale and mudstone in the Kongnan aera of Huanghua depression around the Bohai Bay.In the Kongnan area,the lake basins were very large and deep during the deposition of the 2nd Member of Kongdian Formation.During that period,the lakes were sealed,uncommunicated with the sea water and the paleoclimate was very warm and wet in Kongnan area.Analyzing the content of the trace element and the rare earth element,carbon and oxygen isotope in the disquisition,The authors prove the two views correct.     

Temporal variations of physical and hydrochemical properties of springs in the Mid‐Levels area,Hong Kong: results of a 1‐year comprehensive monitoring programme

Springs and seeps occur in the spaces around Po Hing Fong Street in the Mid‐Levels area, Hong Kong. Most of the springs occur through the drainage weepholes on retaining walls at the street. This paper first examines the geology and history of the springs. The paper then reports the findings from a 1‐year comprehensive spring monitoring programme. The temporal variations of flow rate, physiochemical parameters and hydrochemistry of the springs are discussed. The average temperatures of the springs were close to the mean air temperature, although there was a systematic lag time of 40 to 50 days between the peak air temperature and highest water temperatures. Spring waters from two rows of weepholes in the retaining wall showed significantly different physical and hydrochemical responses to the changes in rainfall and temperature, though their vertical distance is only about 1 m. The results suggest that water from the upper row of weepholes may represent a recharge source that is shallow or close to the spring outlets, whereas that from the lower row of weepholes may represent a recharge source that is much deeper or further up the hill. Although the spring flows increased rapidly after rainstorms, analysis of the total dissolved solids showed a delayed response to rainstorm events. The concentration of individual ions in the spring water varied in a unique way in response to rainstorm events. It is clear that the presence of underground man‐made drainage systems and the leakage from water mains in the study area may add complexity to the solute responses and transport mechanisms. Further studies are required to constrain the impacts of these man‐made structures on the hydrogeology of the springs. Copyright © 2007 John Wiley & Sons, Ltd.     

黑龙江省逊克县高松山金矿床地质特征及成因分析

高松山金矿床是与火山作用关系密切的低温热液型金矿床.矿石类型主要为含金石英脉、构造角砾岩蚀变岩型.矿石硫同位素组成具有深源硫特点.流体包裹体中H、O同位素反映在成矿的过程中有大气降水加入.矿床产于中生代上白垩统火山岩中,与英安岩、安山岩、安山玢岩、流纹岩关系密切.岩石化学分析反映了活动大陆边缘环境.     

塔里木盆地西北缘乌恰地区晚白垩世-渐新世微相分析及沉积演化

塔里木盆地西部是我国发育中新生代海相地层的少数地区之一。以沉积微相分析为手段,通过对塔里木盆地西北缘乌恰地区库孜贡苏剖面晚白垩世-古近纪岩性、生物组合、颗粒成分、基质类型及其沉积结构和构造特征等仔细研究,重点针对碳酸盐岩划分出（含）骨屑隐晶灰岩、隐晶灰岩、微（隐）晶白云岩、鸟眼隐晶灰岩、微晶鲕粒白云岩、生物碎屑灰岩、微晶球粒白云岩、生物灰岩、亮晶鲕粒灰岩等9个岩相类型。根据碳酸盐岩微相类型组合和剖面结构沉积特征,划分出潮上带、潮间带、潮下带、台地边缘浅滩和生物礁5个沉积相,并恢复了该区晚白垩世-古近纪的沉积环境演化过程,为查清白垩纪-古近纪特提斯洋演化以及重建该地区古环境和油气勘探研究提供重要的基础材料。     

吉林省前寒武纪变质铁矿成矿地质条件浅析

本文在概略讨论了吉林省前寒武纪地质演化与铁矿成矿作用的基础上,从含矿地层、原始沉积环境、变质作用、构造等对前寒武纪变质铁矿成矿的控制作用进行了分析.认为吉林省前寒武纪变质型铁矿完全受基底构造控制,含矿岩系原岩建造基本为海底火山建造;前寒武纪变质铁矿普遍经历了三期成矿作用;区域变质变形作用对矿床的形成起了决定性作用.