河北东坪金矿区水泉沟岩体的地球化学特征

水泉沟岩体主要由二长岩构成。主要矿物是碱性长石和斜长石,它们的含量高达80%以上。石英不多见,暗色矿物含量少。副矿物主要是磁铁矿、石榴石、榍石和锆石。交代结构发育,蚀变现象普遍。主要化学组分和微量元素含量及δ¹⁸O值变化范围大。该二长岩体是由老片麻岩经热液碱交代作用而成。     

Age Assignment of the Lycoptera- bearing Bed

In the Yanliao area, the occurrence of the Nestoria-Keratestheria fauna and the Eoparacypris- Luanpingella-Darwinula assemblage in the Dabeigou Formation s.s., a Rb-Sr isochron age of 145.2 Ma for the Baiqi Formation and a complete stratigraphic sequence-all this proves that the Lycoptera-bearing bed overlies the Upper Jurassic. The Jehol fauna comprises the primitive Trigonioidids fauna, Eosestheria fauna, Lycoptera fauna et al., and their own laws of evolution expound that they belong to Cretaceous faunas. The associations of Eosestheria with Yanjiestheria, Lycoptera with Eosestheria, and Kuntulunia with Yanjiestheria as well as the occurrence of early angiosperms and sporo - pollen in the Fuxin Formation and its equivalents also demonstrate that the Lycoptera-bearing, bed should be assigned to the Cretaceous. The confirmation of the existence of Aucellina in the Jixi Group and the correlation of Trigonioidids and Cypridids with those in the equivalent strata of Japan and Western Europe have also been     

城市投资环境的评价模型及应用

本文在对投资单元的量化,评价指标的选择及量化进行探讨的基础上,提出了专家得分和模糊评价二种投资评价模型,并以宁波市为例进行了应用.     

吉林省浑江市荒沟山区花岗岩成因类型探讨

本文根据吉林省浑江市荒沟山区中生代花岗岩的岩石学、地球化学及同位素地质学研究，论述了该区花岗岩的成因类型，即老秃顶子岩体、梨树沟岩体、草山岩体均为同熔型。     

新型节水灌溉控制原理的应用研究

在土壤-植物-大气连续体系(SPAC)中,以植物茎、果微增长及其含水量变化作为植物需水信息建立的灌溉自动控制系统,可实现植物水分适度亏缺,有效调控其生长发育。实验结果表明,同充分供水的植株或树体相比,节水15.6%时,玉米长势良好,节水21.4%时,柑桔果实生长未受影响。     

Geochronology and sedimentology of the lower Passaic River,New Jersey

In an attempt to characterize localized rates of sediment accretion, 10 sediment cores were collected from the lower reach of the Passaic River, a major tributary of Newark Bay, New Jersey. Sediments were assayed for ²¹⁰Pb activity at predetermined depths and the rate of sediment accretion (cm yr^?1) was estimated from the least squares regression of the log of unsupported activity versus depth. Sediment accretion rates, derived from ²¹⁰Pb measurements (R_Pb) were used to predict the depth interval within the core containing sediments deposited around 1954; subsequent ¹³⁷Cs analyses were focused on this depth interval. Sediment accretion rates derived from ¹³⁷Cs measurements (R_Cs) were extrapolated from the depth of the 1954 horizon. Lead-210 derived sediment accretion rates in cores collected from a sediment bench extending along the inside bend on the southern shore of a meander in the river, ranged from 4.1 cm yr^?1 to 10.2 cm yr^?1 and averaged 6.8 cm yr^?1. The R_Cs estimates for cores from this area ranged from 3.8 cm yr^?1 to 8.9 cm yr^?1 and averaged 6.6 cm yr^?1. The R_Cs for cores collected in a more hydrologically dynamic reach of the river upstream of the sediment bench, were only 0.41 cm yr^?1 and 0.66 cm yr^?1. The results of this investigation indicate that this reach of the lower Passaic River is an area of high sediment accumulation, retaining much of the sediment load deposited from upstream and downstream sources. The rates of sediment accretion in the lower Passaic River are among the highest reported anywhere in the Newark Bay estuary.     

水平载流线圈中心点组合波频域电磁测深视电阻率定义

由于近区场的复杂性及目前频域电磁测深方法的局限性,近区频域电磁测深多年来一直是地球物理领域一个悬而未决的问题.本文在近区场理论的基础上,通过引人组合波理论,提出了一种能适于近区频域电磁测深的视电阻率的定义式.该视电阻率在近区具有有效压制背景场、突出地电异常信息的功能,并能客观地反映地电断面的电性变化规律.     

临汾盆地现代地震活动特征及其与深部构造关系初探

本文分析了临汾盆地现代地震在时序分布上的阶段性，平面分布上的丛集性，及其震源三维分布与分布地深部构造的关系，指出盆地北部的临汾－洪洞凹陷为该区未来若干年内的主要发震区，而２０－３０ｋｍ深度则是主要发震层次。     

Studies of Nitrous Oxide Emission from Farmlands in North China

Measurements of nitrous oxide emission from agricultural lands were conducted. The results show that nitrous oxide fluxes on several soils are at the range of 2-60 μg . N / m2 h. Factors influencing the production rates of nitrous oxide from the soils, such as soil temperature, soil moisture and fertilization, are discussed. The calculated amount of nitrous oxide emission from China farmlands is 9.8 × 107 Kg . N per year, which accounts for about 10% of the total source strength in China areas.     

有限单元数值模拟在张家界风景区地质调查中的应用

对张家界风景区进行1/25000遥感地质调查,解译出1031条线性构造,经野外验证可靠性达85％,新确认该区存在北北东向褶皱,提出了该区经历了两次以上的褶皱构造运动的新认识。认为北北东和北东东向构造是该区的基本构造骨架,设计了区域性印支期和张家界风景区印支期、燕山早期、燕山晚期四种应力场模型,采用有限单元法进行构造应力场反演计算,所获结果与野外调查结果吻合。认为砂岩峰林地貌是泥盆纪石英砂岩处于宽缓向斜扬起端及后期背斜叠加使地层趋于水平的部位才利于砂岩峰柱的稳定形成,多次构造应力作用产生的高角度裂隙有利于峰林地貌的造型,挽近时期地壳抬升是峰林地貌形成的动力。