光照强度对隐藻吸收铁和磷的影响

在模拟条件下,通过深入研究光照强度对隐藻生长率的影响,以及不同光照强度下藻细胞对Fe和P的吸收差异,提出了光照强度控制藻细胞对营养元素的吸收,最终限制赤潮藻爆发性增殖的作用途径.研究表明,藻细胞的生长率与光照强度之间呈指数相关关系;隐藻生长的光饱和值与光半饱和值分别为150 μmol/(m2·s)和47 μmol/(m2·s);在低光照强度下藻细胞的生长率较低,但是藻细胞却需要吸收更多的Fe和P,以及Zn、Mn、Co和Mo等微量元素,在光照强度为10 μmol/(m2·s)时,藻细胞生长率仅为光照强度150 μmol/(m2·s)时的十分之一,而藻细胞对Fe和P的吸收量分别提高了1.5倍和1倍.这些研究结果为揭示导致赤潮常在光照良好天气后发生的根本原因提供了全新的认识.     

高分辨率航磁方法及在大冶铁矿区的应用

本文针对危机矿山深部及周边找矿的难度大、勘探周期短的特点,提出了一套以找矿为目的,集直升机大比例尺航空物探测量、数据处理、解释为一体的高分辨率航磁方法技术.这些方法包括硬架式直升机航磁测量方法、曲面位场处理方法、精细反演解释方法等.应用该方法在湖北黄石大冶铁矿中布钻,已有两孔见富磁铁矿及伴生的铜、金矿,见矿最大厚度为14.6m.因此,高分辨率航磁方法在危机矿山进一步挖潜工作中可以实现快速找矿目的.     

固体矿产储量估算系统的研究与实现

通过对固体矿产储量估算过程的详细调研,对储量估算过程中的单工程圈定算法、矿体剖面连接以及传统的储量估算方法中的平行剖面法和地质块段法做了详细研究,并针对储量计算的可视化及交互技术进行了研究,实现了一种基于Windows操作系统、MapGIS地理信息系统平台的固体矿产储量估算原型系统,实现了对固体矿产勘查数据的有效存储、管理、可视化分析及评价。     

中国省域煤矿事故时空分异特征及影响因素研究

煤矿事故给国家和人民带来巨大的生命财产损失,科学把握煤矿事故发生的宏观规律及区域煤矿安全的影响因素有助于促进煤矿安全生产。本文尝试采用GIS空间分析方法开展区域煤矿事故的研究,基于空间自相关性、时空演化规律方法研究了2006-2015年中国省域煤矿事故的时空分异特点,并分析了省域煤矿安全的影响因素及相对风险度。主要结论：①中国各省区之间煤矿事故存在明显的空间自相关性,但随着各省区煤矿安全生产形势改善情况的不同,其自相关性在不断下降;②以空间重心转移曲线分析中国煤矿事故发生的时空演化规律,10年间煤矿事故空间重心向东北方向转移。③重特大事故频发的省区由于监管措施的有力执行往往具有较低的煤矿百万吨死亡率;平均煤矿生产能力低的省区具有较高的煤矿百万吨死亡率;④建立基于解释变量的贝叶斯空间模型,以煤炭百万吨死亡率为指标评估中国各省区煤矿事故相对风险度,中国煤矿安全生产相对危险度存在明显的空间分布规律且各省区差异较大,相对危险度较高的省区主要集中在南方地区,包括湖北、福建等,危险度较低的省区主要集中在中东部地区,包括山西、内蒙古等。     

Role of buffer layer in electronic structures of iron phthalocyanine molecules on Au(111)

We investigate the electronic structures of one and two monolayer iron phthalocyanine (FePc) molecules on Au(111) surfaces. The first monolayer FePc is lying flat on the Au(111) substrate, and the second monolayer FePc is tilted at ～15° relative to the substrate plane along the nearest neighbour [101^-] direction with a lobe downward to the central hole of the unit cell in the first layer. The structural information obtained by first-principles calculations is in agreement with the experiment results. Furthermore, it is demonstrated that the electronic structures of FePc molecules in one-monolayer FePc/Au(111) system are perturbed significantly, while the electronic structures of FePc molecules in the second monolayer in two-monolayer FePc/Au(111) system remain almost unchanged due to the screening of the buffer layer on Au(111).     

Leachable particulate iron in the Columbia River,estuary, and near-field plume

This study examines the distribution of leachable particulate iron (Fe) in the Columbia River, estuary, and near-field plume. Surface samples were collected during late spring and summer of 2004–2006 as part of four River Influence on Shelf Ecosystems (RISE) cruises. Tidal amplitude and river flow are the primary factors influencing the estuary leachable particulate Fe concentrations, with greater values during high flow and/or spring tides. Near the mouth of the estuary, leachable particulate Fe [defined as the particulate Fe solubilized with a 25% acetic acid (pH 2) leach containing a weak reducing agent to reduce Fe oxyhydroxides and a short heating step to access intracellular Fe] averaged 770 nM during either spring tide or high flow, compared to 320 nM during neap tide, low flow conditions. In the near-field Columbia River plume, elevated leachable particulate Fe concentrations occur during spring tides and/or higher river flow, with resuspended shelf sediment as an additional source to the plume during periods of coastal upwelling and spring tides. Near-field plume concentrations of leachable particulate Fe (at a salinity of 20) averaged 660 nM during either spring tide or high flow, compared to 300 nM during neap tide, low flow conditions. Regardless of tidal amplitude and river flow, leachable particulate Fe concentrations in both the river/estuary and near-field plume are consistently one to two orders of magnitude greater than dissolved Fe concentrations. The Columbia River is an important source of reactive Fe to the productive coastal waters off Oregon and Washington, and leachable particulate Fe is available for solubilization following biological drawdown of the dissolved phase. Elevated leachable Fe concentrations allow coastal waters influenced by the Columbia River plume to remain Fe-replete and support phytoplankton production during the spring and summer seasons.     

桐梓煤矿大竹坝井田勘查类型及勘查工程间距的确定

通过对大竹坝井田构造复杂程度和煤层稳定程度进行分析研究和综合评价,认真总结煤层厚度变化的规律。对井田勘查工作进行了分区,在同一井田内划分了两个不同的勘查类型,选择主要的勘查区块进行了勘探,并按照论证的结论合理布设勘查工程间距,实现了以较小的经济投入获取较佳地质成果的勘查目标。其评价过程和由此获得的经济效益为今后的地质勘查工作中在确定地质勘查类型时有一定的借鉴作用。     

南召县石鼓金矿地质特征及成因探讨

石鼓金矿位于北秦岭复杂褶皱带东段,乔端-瓦穴子断裂南侧,牧虎顶花岗岩体之北侧,矿脉的产出受断裂构造控制.矿脉数量多,规模大小不一,成矿与构造岩浆活动等关系密切.矿床类型为石英脉型.     

后疫情时期全球铁矿资源格局分析

铁是我国用量最大、用途最广的金属,新冠肺炎疫情期间国际铁矿石市场出现较多新变化,分析国际铁矿石供需和市场格局变化原因,研判未来趋势,对于保障我国铁矿石资源稳定供应具有重要意义.本文首先分析了新冠肺炎疫情下,全球钢铁产量、铁矿石供应和价格变化趋势,分析发现受新冠肺炎疫情影响,全球铁矿石供需格局进一步集中,呈现"两个国家,...     

蒙库铁矿床与镜铁山铁矿床的对比研究

蒙库铁矿床被认为是与海底喷流沉积作用有关的铁矿床,但存在很大的争议.文章将其与典型的喷流沉积型铁矿--镜铁山铁矿床对比,并结合野外的第一手资料,发现蒙库铁矿床的喷流沉积特征并不明显,而热液成矿作用比较明显,但是热液的性质和来源、成矿时间等尚不明了,蒙库铁矿的成因机理仍有待深入研究.