共查询到19条相似文献，搜索用时 109 毫秒
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孙家庄铁矿床是隐伏于第四系之下的沉积变质型铁矿床,通过高精度的磁法扫面和剖面测量,获取直接的磁异常数据,采用化极处理、向上延拓分析、剖面解释等方法,确定了异常体的空间位置、产状及规模大小,为矿床勘查提供了较为明确的地球物理依据. 相似文献
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正10月14日,河南省煤田地质局一队承担的河南省新蔡县练村铁矿勘探顺利通过评审,矿床规模为大型,对今后该地区寻找隐伏铁矿具有重要借鉴意义。该矿床为豫东南探明的第一个隐伏大型沉积变质型铁矿,由河南煤田一队承担全部技术服务工作。项目自2012年12月开工,2014年7月结束全部野外工作,累计完成钻探工作量29孔,共计完成钻探工作量3.85万 相似文献
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<正>10月14日,河南省煤田地质局一队承担的河南省新蔡县练村铁矿勘探顺利通过评审,矿床规模为大型,对今后该地区寻找隐伏铁矿具有重要借鉴意义。该矿床为豫东南探明的第一个隐伏大型沉积变质型铁矿,由河南煤田一队承担全部技术服务工作。项目自2012年12月开工,2014年7月结束全部野外工作,累计完成钻探工作量29孔,共计完成钻探工作量3.85万 相似文献
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以甲基卡稀有金属矿区X03号矿体和烧炭沟矿体2个隐伏矿体作为研究对象,采用主动吸气法,以5%稀硝酸溶液作为捕集剂进行地气测量试验研究。结果表明,地气捕集液中Li、Be、Rb、Cs、Na、B等元素在矿体上方出现多点连续的组合异常,可以指示地表以下30~100 m的隐伏矿体。X03号矿体35号勘探线上,地气中成矿元素异常与土壤中元素含量之间没有相关性,表明地气异常并不是土壤元素含量所形成的,而是来源于隐伏矿体,是隐伏矿体的直接信息反映。地气异常表现为顶部异常特征,隐伏矿体位于异常的下部。甲基卡稀有金属矿区采用地气测量技术寻找隐伏矿体时,在成矿地质条件研究的基础上,结合电法等地球物理资料,可在地气异常的上方布置钻探工程进行钻探验证。 相似文献
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EH4大地电磁测深系统在山东临淄地区岩溶裂隙水勘查中的应用 总被引：1，自引：0，他引：1
EH-4大地电磁测深系统是较为先进的电磁法勘探仪器,因其轻便高效、勘探深度大和反映直观的优点而广泛应用于矿产勘查和工程水文勘查中。山东淄川地区岩溶裂隙水勘查中,通过EH-4电磁测深工作并结合实地水文地质调查,在确定了构造带的水源补给及赋水条件的情况下,找到了含水断裂带或裂隙带,根据地质体的电性差异来测定构造带的宽度、延深、产状及赋水性,资料显示异常清晰、显著,且与钻探验证结果位置吻合,取得了较好效果。也为EH-4系统在深部水文勘查中的应用指明了方向。 相似文献
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《中国地理科学(英文版)》2021,(3)
Understanding regional environmental heterogeneity(EH) and biodiversity relationships(heterogeneity-diversity relationships: HDRs) is the first step toward coupling environmental variables with biodiversity surrogates into regional systematic conservation planning. However, there is no universal method for determining regional HDRs that considers various environmental variables and biodiversity in different regions. This study selected 32 nature reserves as natural areas in Yunnan, China, to examine regional HDRs in Yunnan. We calculated 17 EH parameters(of soil, topography, and climate) and three(ecosystem, plant, and animal) biodiversity indices in the nature reserves. By examining the explanatory power of each EH parameter and area of the nature reserve, we identified the primary parameters and constructed an optimal model for each biodiversity index. The explanatory powers of these parameters varied for each biodiversity index, and those of climatic parameters were generally higher than soil and topographic heterogeneity ones. Heterogeneity of the temperature annual range, followed by area and heterogeneity of soil type, were important parameters for ecosystem diversity of Yunnan and the optimal model explained 56.9%. Plant diversity was explained 54.5% by its optimal model, consisting of heterogeneity of precipitation of the coldest quarter and annual precipitation. Heterogeneity of temperature annual range was important for animal diversity in Yunnan and explained 29.6% of its optimal model. This study suggests that EH parameters can be an effective surrogate for biodiversity, therefore, we suggested that the significance and role of climatically heterogeneous regions for the conservation of biodiversity in Yunnan should be further studied in the future. 相似文献
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Structure and anti-influenza A (H1N1) virus activity of three polysaccharides from Eucheuma denticulatum 总被引：1，自引：0，他引：1
YU Guangli LI Miaomiao WANG Wei LIU Xin ZHAO Xiaoliang LV Youjing LI Guangsheng JIAO Guangling ZHAO Xia 《中国海洋大学学报(英文版)》2012,11(4):527-532
Three polysaccharides(EW,EH and EA) were prepared from a red alga Eucheuma denticulatum by sequential extraction with cold water,hot water and sodium hydroxide water solution.Their monosaccharide compositions,relative molecular mass and structural characterization were determined by gas chromatography,high performance 1iquid chromatography,fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy methods.EW was hybrid ι/κ/ν-carrageenan(70 ι/17κ/13ν-carrabiose),EH was mainly ι-carrageenan,and EA was mainly α-1,4-Glucan(88%) but mixed with small amount of ι-carrageenan(12%).The relative molecular mass of EW,EH and EA was 480,580 and 510 kDa,respectively.The anti-influenza A(H1N1) virus activity of these three polysaccharides was evaluated using the Madin-Darby canine kidney cells model.EW showed good anti-H1N1 virus activity,its IC 50 was 276.5 μg mL-1,and the inhibition rate to H1N1 virus was 52% when its concentration was 250 μg mL-1.The IC 50 of ι-carrageenan EH was 366.4 μg mL-1,whereas EA showed lower anti-H1N1 virus activity(IC 50 >430 μg mL-1).Available data obtained give positive evidence that the hybrid carrageenan EW from Eucheuma denticulatum can be used as potential anti-H1N1 virus inhibitor in future. 相似文献
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A new kinetic spectrophotometric method is developed for the measurement of manganese (Ⅱ) in water. The method is based on the catalytic effect of manganese (Ⅱ) with the oxidation of weak acid brilliant blue dye (RAWL) by KIO4 using the Nitrilo triacetic acid (NTA) as an activation reagent. The optimum conditions obtained are 40mgL-1 RAWL, 1×10-4molL-1 KIO4, 2×10-4molL-1 Nitrilo triacetic acid (NTA), pH = 5.8, the reaction time of 3.00 min and the temperature of 20.0 ℃. Under the optimum con-ditions, the proposed method allows the measurement of manganese (Ⅱ) in a range of 0-50.0ngmL-1 and with a detection limit of down to 0.158 ng mL-1. The recovery efficiency in measuring the standard manganese (Ⅱ) solution is in a range of 98.5%-102%, and the RSD is in a range of 0.76%-1.25%. The new method has been successfully applied to the measurement of manganese (Ⅱ) in both fresh water and seawater samples with satisfying results. Moreover, few cations and anions interfere with the measurement of man-ganese (Ⅱ). Compared with other kinetic catalytic methods and instrumental methods, the proposed method shows fairly good selec-tivity and sensitivity, low cost, cheapness, low detection limit and rapidity. It can be applied on boats easily. 相似文献
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A new kinetic spectrophotometric method is developed for the measurement of manganese (II) in water. The method is based on
the catalytic effect of manganese (II) with the oxidation of weak acid brilliant blue dye (RAWL) by KIO4 using the Nitrilo triacetic acid (NTA) as an activation reagent. The optimum conditions obtained are 40 mgL−1 RAWL, 1×10−4molL−1 KIO4, 2×10−4 molL−1 Nitrilo triacetic acid (NTA), pH = 5.8, the reaction time of 3.00 min and the temperature of 20.0 °C. Under the optimum conditions,
the proposed method allows the measurement of manganese (II) in a range of 0–50.0 ng mL−1 and with a detection limit of down to 0.158 ng mL−1. The recovery efficiency in measuring the standard manganese (II) solution is in a range of 98.5%–102%, and the RSD is in
a range of 0.76%–1.25%. The new method has been successfully applied to the measurement of manganese (II) in both fresh water
and seawater samples with satisfying results. Moreover, few cations and anions interfere with the measurement of manganese
(II). Compared with other kinetic catalytic methods and instrumental methods, the proposed method shows fairly good selectivity
and sensitivity, low cost, cheapness, low detection limit and rapidity. It can be applied on boats easily. 相似文献
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概述了两种不同类型的静电反馈装置的基本原理，介绍它们在区域重力测量、微重力测量、垂直梯度测量、固体潮观测和周期误差标定等方面的优越性及实际应用效果。根据四台仪器的标定实践，研究了反馈系统的线性度检测与调整和转换因子的标定问题。最后提出了还有待研究的几个问题。 相似文献