井水位的振荡与地震波

利用弹性理论和渗流理论研究了井水位振荡试验,给出了一种计算水井含水层频率特性参数（固有振动周期和阻尼系数）的新方法,对５口水井进行了ＳＬＵＧ试验,计算水井含水层的固有振动周期和阻尼系数,分析了水井对地震波响应的规律和内在联系。水井含水层系统对地震波的响应主要取决于水井含水层系统的固有振动周期和振动的阻尼系数,固有振动周期越是接近地震波－瑞利波的振动周期２０ｓ振动的阻尼系数越小,它对地震波的响应越好     

GIS在农业生态地质调查中的应用

GIS凭借其所具有的科学可视化功能,区域性、多层次、易操作等特点,能够将各种空间、 数字数据分类存储并进行分析,以上优点使GIS能够在农业地质调查项目中起到存储信息、分析态 势、辅助决策等重要作用,并能够在此基础上建立数据库辅助管理决策系统,在农业生态地质调查 中发挥了巨大作用。     

Dynamic response of a porous seabed around pipeline under three-dimensional wave loading

The evaluation of the wave-induced pore pressure around a buried pipeline is particularly important for pipeline engineers involved in the design of offshore pipelines. Most previous investigations of the wave-induced dynamic response around an offshore pipeline have limited to two-dimensional cases. In this paper, a three-dimensional model including buried pipeline is established, based on the existing DYNE3WAC models. Based on the proposed numerical model and poro-elastic soil material assumption, the effects of wave and soil characteristics, such as wave period, water depth, shear modulus and permeability, and configuration of pipelines, such as pipeline radius and pipeline buried depth, on the wave-induced excess pore pressure will be examined. Numerical results indicated that the normalized excess pore pressures versus z/h near the pipeline increase as the obliquity angle, wave period and water depth increase, and they decrease as the burial depth and radius of pipeline increase above the pipeline. Soil permeability has obvious influence on the wave-induced normalized excess pore pressure, and different soil material will result in distinct computation results.     

Secondary metabolites of a deep sea derived fungus Aspergillus versicolor CXCTD-06-6a and their bioactivity

In order to obtain novel secondary metabolites, a deep sea inhabiting fungus Aspergillus versicolor CXCTD-06-6a was investigated. One new diketopiperazine brevianamide W(1a), as well as five known diketopiperazine alkaloids, diketopiperazine V(1b), brevianamide Q(2), brevianamide R(3), brevianamide K(4), and brevianamide E(5), were isolated from the Et OAc extract of the fermentation broth. Their structures were elucidated by spectroscopy techniques(NMR, MS). The six compounds exhibited moderate radical scavenging activity against DPPH with clearance ratio of 55.0%(1a and 1b), 53.7%(2), 46.2%(3), 61.4%(4) and 19.3%(5) at a concentration of 13.9 μmol L-1, respectively; while the positive control ascorbic acid showed a ratio of 70.3% at the concentration of 28.4 μmol L-1.     

Immobilization of phosphorus in sewage sludge using inorganic amendments

Sewage sludge contains large amount of water-soluble phosphorus, which is prone to runoff loss when sewage sludge is land applied. Phosphorus export from sewage sludge is an important cause for water eutrophication. Immobilization of phosphorus before sewage sludge land application seems necessary. In this study, three amendments including red mud (RM), lime and mixture of RM and lime were employed to immobilize phosphorus in fresh sewage sludge. It was found that phosphorus was effectively controlled by RM, lime and mixture of RM and lime. Sequential chemical extraction results indicate that the RM amendment transformed H₂O-P in the sewage sludge into the NaOH-P, while the lime amendment transformed H₂O-P in the sewage sludge into the HCl-P. Such transformations in phosphorus fractions would have little influence on phosphorus availability but would retard and reduce potential phosphorus loss following sewage sludge was land applied.     

论岩溶水系统预报时边界条件问题

<正>七十年代以来,国内用线性渗流确定性模型对地下水系统进行数值模似(反求参数,预报人工流场),已取得丰富的成果和经验,但也存在一些问题。其中重要的问题之一是模型预报时边界条件的非确定性。对于该问题虽然有不同的解决办法,也有一些较大的分歧,至今还缺乏一套科学依据较严密的处理原则和求值方法。     

山东省侏罗－白垩纪岩石地层清理意见

运用多重地层划分进行山东省地层清理研究中，对中生代侏罗－白垩纪岩石地层划分得出一些新认识。提出蒙阴盆地及其周围的汶南组与淄博地区的三台组属同物异名，故泣南组名应废弃。山东省侏罗系只有坊子组、三台组一个地层序列，将二者合建淄博群。并按岩石地层划分原则，以岩石组合特征为依据，对白垩系进行了划分、对比，建立了区域地层格架，理顺了莱阳群、青山群、大盛群、王氏群各单位间相互关系，避免了同名异物和同物异名等现象，４个群共划分组级单位２２个。     

贵州东南部煌斑岩类中稀土元素超常富集

正贵州东南部产出大量规模不等的煌斑岩类岩体,其中位于贵州镇远马坪的煌斑岩体是我国发现的第一个含原生金刚石岩体,并将其作为寻找规模性金刚石矿床的重点,但遗憾的是,截至目前,一直未在金刚石找矿方面取得较大突破。然而,笔者及课题组成员通过多次野外调查和实验分析发现,贵州东南部镇远、麻江一带煌斑岩类及其风化壳中明显     

Corner points localization in electronic topographic maps with deep neural networks

Digitized topographic maps normally have to go through the geometric calibration before practical utilization. Nowadays, the reference points for the calibration are still manually assigned. Corner points (graticule intersections) in a map are usually good candidates in favor of the reference points. This paper proposes an algorithm for automatically locating the corner points in the electronic topographic maps by detecting the specific rectangle objects in the map corners. It assigns the probabilities to each row and column in the region of interests (RoIs) to provide information regarding the location of the objects. In order to facilitate the object detection with high level visual features, the deep neural networks (DNNs) are employed in the proposed algorithm. For the object proposal, the sliding window scheme is adopted. The experimental results indicate that the proposed approach outperforms the conventional bounding-box regression method in both detection and localization accuracy. For the proposed algorithm, the average F1 score in the object detection is 0.91, which is 12% higher than the conventional model. The mean Euclidean distance between the predicted corner points and the ground-truth by the proposed algorithm is 2.22 pixels, 35.8% lower compared with the regression based model.