新疆小热泉子铜矿区构造特征及成矿模式   总被引：3，自引：0，他引：3  

孙立蒨  尚玲 《地质力学学报》1998,4(2):83-90

新疆小热泉子铜矿区总体为一NW-SE走向的不协调短轴复背斜,后期有SN向次级褶皱叠加。区内NW向断裂发育,均为EW向大断裂之分支断裂,规模小,无推覆性质,主要矿床(Ⅰ号矿床)呈较为典型的立交桥式双层成矿模式。矿床成因类型为中温热液充填-交代型铜(锌)矿床。   相似文献   

Dynamics of DOC of euphotic layer in the Taiwan Strait——Diurnal variation of large range     

Peng Xingyue  Hong Huasheng  Shang Shaoling 《海洋学报(英文版)》1998,17(4):483-493

ThisstudywassupportedbytheStateEducationalCommittee(SEC)ofChina.INTRODUCTIONThedissolvedorganiccarbon(DOC),ordissolvedorganicmatter(DOM),isoneofthemostimPortantorganiccarbonreservoiroftheworld,whichmayaffectthecontentofCO2intheatmospherewithatime-scaleof1OOO~1OOOOyears(Hedges,1992).Theratesofproduction,degradationortransPortationofDOCareseveralmaindynamicalparametersofDOCintheeu-photiclayer.Inthispaper,wefocusonthediurnalvariationsofDOCinordertoestimatetheseparameters.METso…  相似文献   

Short term variability of Particle fluxes and its relation to variability in sea surface temperature and chlorophylla field detected by Ocean Color and Temperature Scanner (OCTS) off Sanriku, northwestern North Pacific in the spring of 1997     

Toshiro Saino  Shaoling Shang  Yoshihisa Mino  Koji Suzuki  Hideaki Nomura  Sei-ichi Saitoh  Hideo Miyake  Toshiyuki Masuzawa  Koh Harada 《Journal of Oceanography》1998,54(5):583-592

A sediment trap experiment was carried out in conjunction with an over flight of Ocean Color Temperature Scanner (OCTS) on board Advanced Earth Observing Satellite (ADEOS) at 40°N, 143°E off Sanriku in April to May 1997. Short term variability of particle fluxes was examined at depths of 450 m and 600 m from April 6 to May 1 with a sampling interval of two days, and at 450 m with one day interval from 2nd to 10th May. Daily averaged mass flux at 450 m and 600 m was 815 mg m⁻²d⁻¹ and 862 mg m⁻²d⁻¹, respectively. A sharp increase in mass flux was observed during the period from April 26 to April 29 with the highest mass flux of 8 g m⁻²d⁻¹. About 85% of the total mass flux for the entire duration (26 days) was collected within these 4 days. Trapped material during the peak flux period was mainly composed of diatoms dominated byThalassiosira spp. and resting spores ofChaetoceros spp. This suggested that the peak flux was the result of (a) diatom bloom(s) in the euphotic column. Current meter records at 420 m showed that on April 26 and 27, the period when the peak flux was observed, the southwestward current had diminished in strength and changed its direction northwestward. Low current speeds appeared to have enhanced trap efficiency to help form the peak flux. A time series of OCTS Intensive-LAC (Local Area Coverage: Region B) images from mid-March to early May was examined todetect phytoplankton bloom(s). In the March 26th Chl image, high concentration region was restricted to the southwest off Cape Erimo, but spread around the warm core ring (WCR) 93A by April 10. East of the WCR93A, high Chl concentration remained steady until May, but to the west of the WCR93A, Chl decreased rapidly before the 19th of April. From this observation we suspect that the peak flux observed at the end of April originated from a bloom, which ceased on the 17th or 18th of April, in the region north of 40°N and west of 143°E. Taking the current meter records into account, the source region for the trapped material is most likely around southwest of the Cape Erimo.  相似文献   

啤麦穗粒结构的分阶段气候评价和预报方法研究   总被引：9，自引：0，他引：9  

商兆堂  蒋名淑 《气象科学》1999,19(4):407-412

通过对十多年来啤麦穗粒结构与气象条件的关系的计算分析,得出了啤麦不同生育阶段影响穗粒结构的主要气象要素,并建立起其间的线性关系模式,为对啤麦产量构成要素进行分阶段的气候评价和预报提供了新的方法。  相似文献   

“六淫”致病的科学性及定量标准探讨   总被引：6，自引：0，他引：6  

李连方  尚品洁  杨金莲 《气候与环境研究》1999,4(1):87-93

《黄帝内经》将气象学中的风、寒、暑、湿、燥、火（热）6种气象现象的太过、不及或非时之候而影响人体病变的发生,又将人体疾病症候状况分成上述6种类似气象现象的类型统称“六淫”。前者为外感疾病病因分类,后者为症候分类。于是,“六淫”就 有了双重含义。对“六淫”的科学含义及其定量标准进行了探讨。  相似文献   

海洋生态系统动力学研究的相关网上资源     

陈尚  马艳  朱明远  王辉 《海洋科学进展》1999,(2)

分４部分介绍互联网上与海洋生态系统动力学研究有关的信息资源、主要网址及其主要内容：（１）海洋生态系统模拟研究;（２）海洋科学研究组织和国际研究计划;（３）网上新闻讨论组;（４）海洋生态杂志。  相似文献   

Influence of land use on the persistence effect of riverine phosphorus          下载免费PDF全文

Dingjiang Chen  Fang Xia  Xu Shang  YuanYuan Liu  Randy A. Dahlgren  Kun Mei 《水文研究》2018,32(1):118-125

The persistence effect contribution of legacy nutrients is often cited as a reason for little or no improvement in water quality following extensive implementation of watershed nutrient mitigation actions, yet there is limited knowledge concerning factors influencing this response, often called the “persistence effect.” Here, we adopted detrended fluctuation analysis and Spearman analysis methods to assess the influence of land use on the watershed phosphorus (P) persistence effect, using monthly water quality records during 2010–2016 in 13 catchments within a drinking water reservoir watershed in eastern China. Detrended fluctuation analysis was used to calculate the Hurst exponent α to assess watershed legacy P characteristics (α  ≈ 0.5, α  > 0.5, and α  < 0.5 indicate white noise, persistence, and anti‐persistence, respectively). Results showed weak to strong P persistence (0.60–0.81) in the time series of riverine P in the 13 catchments. The Hurst exponent α had negative relationships with agricultural land (R = ?.47, p = .11) and developed land (R = ?.67, p = .01) and a positive relationship with forest land cover (R = .48, p = .10). The persistence effect of riverine P was mainly determined by retention ability (biogeochemical legacy) and migration efficiency (hydrological legacy). A catchment with strong retention capacity (e.g., biomass uptake/storage and soil PO₄ sorption) and low migration efficiency results in a stronger persistence effect for riverine P. In practice, source control is more effective in catchments with weak persistence, whereas sink control (e.g., riparian buffers and wetlands) is preferred in catchments with strong persistence effects.  相似文献   

Enhancing seismic P phase arrival picking based on wavelet denoising and kurtosis picker     

Xueyi Shang  Xibing Li  Lei Weng 《Journal of Seismology》2018,22(1):21-33

P phase arrival picking of weak signals is still challenging in seismology. A wavelet denoising is proposed to enhance seismic P phase arrival picking, and the kurtosis picker is applied on the wavelet-denoised signal to identify P phase arrival. It has been called the WD-K picker. The WD-K picker, which is different from those traditional wavelet-based pickers on the basis of a single wavelet component or certain main wavelet components, takes full advantage of the reconstruction of main detail wavelet components and the approximate wavelet component. The proposed WD-K picker considers more wavelet components and presents a better P phase arrival feature. The WD-K picker has been evaluated on 500 micro-seismic signals recorded in the Chinese Yongshaba mine. The comparison between the WD-K pickings and manual pickings shows the good picking accuracy of the WD-K picker. Furthermore, the WD-K picking performance has been compared with the main detail wavelet component combining-based kurtosis (WDC-K) picker, the single wavelet component-based kurtosis (SW-K) picker, and certain main wavelet component-based maximum kurtosis (MMW-K) picker. The comparison has demonstrated that the WD-K picker has better picking accuracy than the other three-wavelet and kurtosis-based pickers, thus showing the enhanced ability of wavelet denoising.  相似文献   

从原生晕、原生叠加晕到构造叠加晕:化探找盲矿法的发展与创新          下载免费PDF全文

李惠  禹斌  张国义  马久菊  李德亮  孙凤舟  李永才  魏江  赵佳  王俊  王一大  李上  张贺然  魏子鑫 《地质找矿论丛》2016,31(1):92-98

构造叠加晕找盲矿法是在原生晕找盲矿法理论基础上发展的新技术方法。根据热液矿床成矿成晕具多期多阶段叠加特点提出的原生晕叠加理论,将原生晕找盲矿法发展为原生叠加晕找盲矿法;根据热液矿床成矿成晕严格受构造控制而提出的构造叠加晕理论,将原生叠加晕找盲矿法发展为构造叠加晕找盲矿法。文章介绍了从原生晕到原生叠加晕又到构造叠加晕找盲矿法在理论、研究思路、工作方法等方面的发展与创新。  相似文献   

海岸带区域海洋生态环境承载力综合评价方法体系的探讨与分析          下载免费PDF全文

吴侃侃  姜尚  高宇  吴海燕  黄海萍  陈克亮 《海洋开发与管理》2023,40(11):46-58

作为协调海岸带区域开发利用活动与生态环境保护之间关系,衡量海岸带区域可持续发展能力的重要手段之一,海洋生态环境承载力综合评价的量化研究至关重要。文章总结了当前海洋生态环境承载力综合评价研究中所存在的问题,比较分析了当前承载力评价中常用的技术方法,并结合海岸带区域的特点,遴选出一套适用于海岸带区域海洋生态环境承载力综合评价的方法体系;在此基础上,通过案例应用的结果分析,进一步探讨该方法体系的可行性与局限性,并提出了改进建议。研究结果表明：鉴于海岸带区域生态系统的复杂性和不确定性,目前一些传统、常用的承载力评价方法,并不能很好地适用于海岸带区域海洋生态环境承载力综合评价;文章所提出的方法体系通过充分考虑人类活动与海洋生态环境之间的相互作用,能较好地支持海岸带区域海洋生态环境承载力评价指标体系的建立,客观地对各项评价指标进行赋权,并能定量化地对海洋生态环境承载力开展综合分析与评估,从而为海岸带区域生态环境承载力综合评价提供一个可行的途径,并为确保海岸带区域的可持续发展提供经验参考;此外,该方法体系存在着两方面的局限性,包括缺乏权威和统一的指标体系构建方法,以及缺乏具体的评价结果分级标准。鉴此,建议未来需要对指标体系构建和评价结果分类标准的相关方法,进一步开展深入研究,从而不断地完善海洋生态环境承载力综合评价的方法体系,使海洋生态环境承载力综合评价的结果更加科学精确。  相似文献