检索结果-南通市图书馆

Acta Seismologica Sinica(English Edition) 2005年第1期18卷 34-42,124页

作者：李杰刘希强李红毛玉华郑树田 Earthquake Administration of shandong province Taian Seismological Fiducial station of shandong province Earthquake Administration of Anqiu

Wavelet transform method is applied to measure time-frequency distribution characteristics of digital deformation data and noise. Based on the characteristics of primary modulus and stochastic white noise discrimination factor of wavelet decomposition, we analyze the variation rule of normal background and noise data from shandong digital deformation observation data. The research results indicate that: a) 1/4 daily wave, semi-diurnal tide wave, daily wave and half lunar wave and so on quasi-periodic signal exist in the detail decomposing signal of wavelet when scale are equal to 2, 3 and 4; b) The amplitude of detail decomposing signal is the biggest when scale is equal to 3; c) The detail decomposing signal contains mainly noise corresponding to scale 1 and 5, respectively; d) We may trace the abnormal precursory which is related to earthquake by analyzing non-earthquake wavelet decomposing signal whose scale is specified from digital deformation observation data.

关键词： wavelet transform digital deformation observation data separation method between signal and noise discrimination of earthquake precursory

Advances in ground heat exchangers for space heating and cooling:Review and perspectives

在线全文

学校读者我要写书评

暂无评论

Energy and Built environment 2024年第2期5卷 255-269页

作者： Ping Cui Weibo Yang Wenke Zhang Ke Zhu Jeffrey D.Spitler Mingzhi Yu School of Thermal Engineering Shandong Jianzhu UniversityJinanShandong 250101China College of Electrical Energy and Power EngineeringYangzhou UniversityYangzhouJiangsu 225127China Department of Mechanical Engineering Oklahoma State UniversityStillwaterOKUSA

As a renewable energy source,geothermal energy has been widely used to provide space heating and cooling for *** thermal performance of ground heat exchanger(GHE)is significant for the operating efficiency of the ground source heat pump(GSHP)*** paper presents a comprehensive review of developments and advances of three kinds of GHE,including vertical borehole GHE(VBGHE),Pile GHE(PGHE),and deep borehole GHE(DBGHE)which are currently popular in larger GSHP ***,analytical models proposed to ana-lyze heat transfer process of VBGHE with different geological conditions are summarized,such as homogenous or heterogeneous ground,with or without groundwater *** and short-time step models and measures to improve GHE thermal performance are also ***,a summary of research advances in PGHE is provided,which includes the heat transfer models of PGHE,the effects of geometric structure,oper-ation modes,pile spacing,use of phase change material(PCM),thermal properties of PCM,thermo-mechanical behavior and/or thermal performance of *** effects of groundwater flow direction and velocity on PGHE are also summarized in ***,models of three kinds of DBGHEs,i.e.,deep coaxial GHE(DCGHE),deep U-bend GHE(DUGHE)and super-long gravity heat pipe(SLGHP),are *** physical bases of the dif-ferent analytical models are elaborated and also their advantages and disadvantages are *** in numerical modelling and improving numerical model calculation speed of DCBHE,DCBHE array,and DUBHE are *** review provides a meaningful reference for the further study of GHEs.

关键词： Vertical borehole ground heat exchanger Pile ground heat exchanger Deep borehole ground heat exchanger Modelling

Genesis of the Shijia Gold Deposit， Jiaodong Peninsula， China: Constraints from Fluid Inclusions and Stable Isotopes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年

作者： Liqiang Feng Ruiwen Shen Xuexiang Gu Yongmei Zhang Zhanlin Ge Yingshuai Zhang Yu He Natural Resources Comprehensive Survey Command Center China geological Survey Ha'erbin Natural Resources Survey Command Center China geological Survey School of Earth Sciences and Resources， China University of Geosciences State Key Laboratory of geological Processes and Mineral Resources， China University of Geosciences Beijing Xi'an Mineral Resources Survey Center China geological Survey Department of Natural Resources of Liangshan Yi Autonomous Prefecture

The Shijia gold deposit， situated in Penglai City， shandong province， is distinguished by its fracture-filling auriferous quartz-sulfide veins. Studies of fluid inclusions and stable isotopes （H-O-C-S） were conducted on this deposit， revealing that the auriferous quartz primarily contains four types of fluid inclusions: CO2-H2O inclusions， pure CO2inclusions， two-phase aqueous inclusions， and solid mineral-bearing multiphase inclusions. The ore-forming fluids of Shijia belong to a heterogeneous H2O-CO2-NaCl system， characterized by moderate to high temperatures （187–386 ℃）， low to high salinities (0.2%–41.2% NaCleq)， and low densities (0.72–1.07 g/cm3). Fluid immiscibility and fluid-rock interaction may have occurred at Shijia， with mineralization depths ranging from 3.3 to 3.9 km. The δD and δ18OH2Ovalues of auriferous quartz vary from -86.1‰ to -79.1‰ and from 9.4‰ to 10.5‰， respectively， suggesting that the ore-forming fluids are of magmatic origin. Carbon isotope compositions of the hydrothermal calcite （-3.31‰ to -0.86‰） indicate the carbon might be related to a mantle source that was contaminated by marine carbonates. The positive δ34S values of sulfides （4.3‰–7.3‰） reflect that the ore-forming materials may be sourced from the metasomatized lithospheric mantle beneath the North China Craton， related to the subduction of the Yangtze Craton in the Triassic. Collectively， the evidence from geology， fluid inclusion and H-O-C-S isotopes indicate that the Shijia gold deposit is of magmatic-hydrothermal origin and related to the Guojialing granite formed by the mixing of crust- and mantle-derived magmas.

关键词：

Machine learning of element geochemical anomalies for adverse geology identification in tunnels

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年

作者： Ruiqi Shao Peng Lin Zhenhao Xu Fumin Liu Yilong Liu School of Qilu Transportation， shandong University State Key Laboratory for Tunnel Engineering Jinan Institute of Geotechnical and Underground Engineering， shandong University

geological analysis， despite being a long-term method for identifying adverse geology in tunnels， has significant limitations due to its reliance on empirical analysis. The quantitative aspects of geochemical anomalies associated with adverse geology provide a novel strategy for addressing these limitations. However， statistical methods for identifying geochemical anomalies are insufficient for tunnel engineering. In contrast， data mining techniques such as machine learning have demonstrated greater efficacy when applied to geological data. Herein， a method for identifying adverse geology using machine learning of geochemical anomalies is proposed. The method was identified geochemical anomalies in tunnel that were not identified by statistical methods. We by employing robust factor analysis and self-organizing maps to reduce the dimensionality of geochemical data and extract the anomaly elements combination (AEC). Using the AEC sample data， we trained an isolation forest model to identify the multi-element anomalies， successfully. We analyzed the adverse geological features based the multi-element anomalies. This study， therefore， extends the traditional approach of geological analysis in tunnels and demonstrates that machine learning is an effective tool for intelligent geological analysis. Correspondingly， the research offers new insights regarding the adverse geology and the prevention of hazards during the construction of tunnels and underground engineering projects.

关键词：

Evaluation of groundwater potential and eco-geological environment quality in Sanjiang Plain of Heilongjiang province

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Groundwater Science and Engineering 2017年第2期5卷 193-201页

作者： WU Ting-wen WANG Li-huan YANG Xiang-kui School of Water Resources and environment China University of Geosciences(Beijing) Beijing 100083 China geological environment monitoring station in Heilongjiang province Harbin 150000 China Heilongjiang Institute of geological survey Harbin 150001 China

Sanjiang Plain of Heilongjiang province has become an important commodity grain base in our country after the construction of more than a century. Groundwater is the main water source for industrial and agricultural production and daily life in the area. With the large-scale development and construction in this area, there are a series of ecological and environmental geological problems, such as the reduction of groundwater resources, which seriously restricts the sustainable development of local agriculture and society as well as economy. Based on the characteristics of three-dimensional flowof groundwater in Sanjiang Plain, this paper adopts the simulation software Visual MODFLOW to evaluate groundwater exploitation potential. The results show that overall there is a certain exploitation potential of Sanjiang Plain groundwater but it is unevenly distributed, and overdraft phenomenon exists in seven farms such as Baoquanling and Chuangye. Based on analytic hierarchy process, the evaluation result of eco-geological environment quality in Sanjiang Plain shows that 94.5% of the region features good geological environment quality, medium stability and medium bearing capacity. The study can provide geological evidence for optimal allocation of water resources, land planning and regulation, and the high and stable yield of the commodity grain base in Sanjiang Plain.

关键词： Sanjiang Plain Groundwater resources potential Eco-geological environment evaluation

Study of Organochlorine Pesticides in Eco-geochemical Survey of Soil in shandong province

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Biotechnology 2019年第2期8卷 196-200,204页

作者： Qing CAI Fang LIU Chunlan LI Shixin CAO Binbin LIU Jingjing WANG shandong Institute of geological Survey Land Quality Geochemistry and Pollution Prevention Engineering Technology Research Center of shandong province geological environment monitoring Master station of shandong province

Based on a comprehensive eco-geochemical survey of shandong province, the differences in pesticide residue situation and contents of DDTs and HCHs in the soils of Yantai City and Southwest shandong province(abbreviated as SSP) were studied in this paper. The results showed that the detection rates of DDTs and HCHs in the soil of SSP were apparently higher than Yantai City. However, the mean contents of DDTs and HCHs in the soil of Yantai were 9 and 25 times of SSP, respectively, and higher than the mean contents of many other cities and areas. p,p′-DDE was the main pesticide residual form in the soil of SSP. It is recognized as the degradation product of DDTs in oxidation environment in past, nevertheless, 5.52% of the soils in Yantai City still have a little of DDT input recently, which has posed a big impact on soil environment quality. β-HCH was the main form of the four isomers of HCHs in Yantai City, and α-HCH/γ-HCH in SSP was low. These reveal that the residual time of HCHs in the soils of both the two areas has a long period. After primary analysis, the risk of DDTs and HCHs in the soil of SSP is low, but DDTs in the soil of Yantai City still has a certain risk.

关键词： Soil Organochlorine pesticides Ecological risk Yantai City Southwest shandong province

Seasonal variations in the phytoplankton community and the relationship between environmental factors of the sea around Xiaoheishan Island in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 2017年第1期35卷 163-173页

作者： ZHANG Zhipeng College of Marine Life Sciences Ocean University of China Qingdao 266003 China Marine Biology Institute of shandong province Qingdao 266104 China Yantai Marine environment monitoring Central station of State Oceanic Administration Yantai 264006 China

Seasonal variations in the phytoplankton community and the relationship between environmental factors of the sea area around Xiaoheishan Island are investigated in the present study. Xiaoheishan Island is located at 37°58′14″N and 120°38′46″E in shandong province, China. A total of 65 species of phytoplankton belonging to three phyla and 27 genera were identified, with Bacillariophyta having the largest number of species. The annual average chlorophyll a concentration for this area was 3.11 μg/L, and there occurs a Skeletonema costatum bloom in winter. The Shannon-Weaver indexes(log_2) of the phytoplankton from all stations were higher than 1, and the Pielou indexes were all higher than 0.3. The results of the canonical correspondence analysis(CCA) indicated that water temperature, PO_4^(3ˉ) and Cu were the environmental factors that had the greatest influence on the distribution of the phytoplankton community throughout the entire year. Although the concentration of heavy metal is well up to the state standards of the first grade of China(GB 3097-1997), these metals still have an impact on the phytoplankton community from this area.

关键词： phytoplankton environmental factor seasonal variations heavy metals Xiaoheishan Island

Physical Prediction Model of Compound Hydrodynamic Unload-Load Response Ratio and Its Application in Reservoir Colluvium Landslide

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年第4期35卷 1304-1315页

作者： Lu Guo Keqiang He Honghua Liu Fandi Meng Xuchun Wang School of Civil Engineering Qingdao University of TechnologyQingdao266520China Key Laboratory of geological Safety of Coastal Urban Underground Space Ministry of Natural ResourcesQingdao266071China

It is well known that the deformation and damage of reservoir colluvium landslides are often determined by the combined dynamics of reservoir water level change and *** on the systematic analysis of the change law of reservoir water level,rainfall and displacements of reservoir colluvium landslide,this paper proposes the compound hydrodynamic action of rainfall and reservoir water as the unload-load parameter,and the landslide displacement as the unload-load response *** on this,a physical prediction model of the compound hydrodynamic unload-load response ratio of reservoir colluvium landslide was established,and the quantitative relationship between the compound hydrodynamic unload-load response ratio and its stability evolution was in-depth analyzed and *** the basis of the above research,taking Shuping landslide,a typical hydrodynamic pressure landslide as an example,the unload-load response ratio model is used to systematically evaluate and predict the stability evolution law and the change trend of the landslide under compound hydrodynamic *** prediction result shows that the variation law of the compound hydrodynamic unload-load response ratio is consistent with the dynamic evolution law of its ***,the above studies show that the compound hydrodynamic unload-load response ratio parameter is an effective displacement dynamic evaluation parameter for reservoir colluvium landslides,so it can be used in the prediction of the reservoir colluvium landslides.

关键词： landslides reservoir colluvium landslide compound hydrodynamics unload-load response ratio Shuping landslide stability evaluation

Sedimentary Facies, Sequence Stratigraphic Patterns in Pre-Cenozoic Inland Compressional Basin: Example from Early Yanshanian Succession of Eastern Yihezhuang Salient, Jiyang Depression, Bohai Bay Basin, China

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2019年第1期30卷 194-205页

作者： Guangzeng Song Hua Wang Meng Xu Jinda Xu Guoqing Sang School of Resources and environment University of Jinan shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals Shandong University of Science and Technology Faculty of Earth Resources China University of Geosciences No.1 Institute of Geology and Mineral Resources of shandong province geological Surveying & Mapping Institute of shandong province

To improve the success rate of locating hydrocarbon reservoirs in pre-Cenozoic inland compressional basins, taking the Early Yanshanian succession of eastern Yihezhuang salient as an example, this paper studied the sedimentary facies and sequence stratigraphic patterns. First, through seismic profiles, well logs, cores and outcrops, the sequence framework was established and internal sedimentary facies were identified. Further, according to analysis of single-wells and connecting-wells, the vertical evolution and horizontal distribution of sedimentation inside the sequence frameworks were discussed. The following results were acquired:(1) meandering river characterized by dual structures superposing each other was developed, and the dual structures can be further divided into three kinds;(2) the entire Early Yanshanian succession was interpreted as one first-order sequence, composed of three third-order sequences, including SQ-Fz1, SQ-Fz2 and SQ-St from bottom to top. Each third-order sequence can be further divided into three system tracts;(3) in different system tracts, different types of dual structures developed separately, and sedimentary bodies showed different horizontal distribution scales and vertical superposition patterns. Finally, the model of sequence stratigraphic patterns was established. This study enhanced the use of sequence stratigraphy to inland tectonically active basins, and would be helpful to predict reservoirs in pre-Cenozoic residual basins.

关键词： Early Yanshanian succession sequence stratigraphic patterns inland compressional basin meandering river dual structure

Characteristics analysis and model prediction of sea-salt water intrusion in lower reaches of the Weihe River,shandong province,China

在线全文

学校读者我要写书评

暂无评论

Journal of Groundwater Science and Engineering 2016年第2期4卷 149-156页

作者： WANG Ji-ning MENG Yong-hui Geology and environment monitoring station of shandong province Jinan 20014China

Marine sedimentary strata are widely distributed in the coastal zone of the study area, and are rich in brine resources. The exploitation of underground water resources often first caused the intrusion of salt water in the marine strata. Based on the analysis of sea-salt water intrusion feature, the sea-salt water intrusion is divided into four stages: The occurrence and development stage(1976–1985), the rapid development stage(1986–1990), the slow development stage(1990–2000) and the stable development stage(2000–2015). Based on the comparative analysis of the relationship between seawater intrusion and influencing factors, this paper presents that the groundwater exploitation and the brine resources mining are the main control factors of sea-salt water intrusion. On this basis, we have established a numerical model of the sea-salt water intrusion. Using this model, we predicted the development trend of the sea-salt water intrusion. The results show that if the current development of groundwater and brine is maintained, the sea-salt water intrusion will gradually withdraw; once development of brine stops, sea-salt water will invade again. This provides the scientific basis for the rational exploitation of groundwater and the prevention of sea-salt water intrusion.

关键词： Sea-salt water intrusion Marine sedimentary strata Brine resources Numerical simulation Influencing factors