共查询到20条相似文献，搜索用时 26 毫秒
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C620—1型车床具有刚性强、精度高、用途广等优点,广泛用于野外地质勘探队的机修车间.但此车床主轴孔径较小,对超过Φ37mm以上的长轴类工件就无法进入.在实际工作中经常遇到需要钻孔的长轴类工件,由于受到车床孔径的限制无法加工.野外地质工作条件差,设备简单是众所周知的.这样革新挖潜来扩大设备的使用范围,提高设备的利用率就很有必要.通过生产实践我们革新了利用车床尾座支撑工件,钻头旋转进行钻削加工的方法解决了长轴类工件的钻孔难题.现依钻削KAM500型钻机横轴油孔为例简述操作方法.横轴长1800mm,最大直径Φ60mm、需要钻削直径Φ10mm、深485mm的油孔一个.难度比较大,加工方法如图1所示: 相似文献
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《地壳构造与地壳应力文集》2016,(2)
在活动断层遥感解译中,SAR数据能发挥重要作用,SAR图像虽不直观,但对植被、浅层土壤具有较好的穿透能力,并且SAR可以在全天候条件下成像。本文以国产HJ-1C卫星SAR数据为例,通过滤波、纹理分析、融合等图像处理方法增强阳原地区断裂信息,提取了阳原盆地南北两条边界断裂,即六棱山北麓断裂和阳原盆地北缘断裂。在此基础上,对阳原地区活动断裂进行了综合解译。相关工作表明,HJ-1C数据具有实用性,同时也说明HJ-1C在断层解译方面具有一定的潜能。 相似文献
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L. A. Kodina V. G. Tokarev G. S. Korobeinik L. V. Vlasova M. P. Bogacheva 《Geochemistry International》2008,46(7):666-678
The distributions of methane and hydrocarbons (HC) C2+ throughout the vertical section of the water mass and sediments of the Kara Sea and the estuaries of the Ob and Yenisei rivers were examine during expeditions aboard the R/V “Akademik Boris Petrov” in 1997–2002. Data obtained during the expeditions and extensive information provided by the complex study of the carbon cycle in the aquatic area were used to analyze the genesis of hydrocarbon gases in marine water. The example of particulate matter was used to demonstrate that hydrocarbon gases of the composition C2–C5 contained in seawater are genetically related to aquatic organic matter (OM), regardless of seawater salinity. The hydrocarbon complex is dominated (80%) by higher C4–C5 homologues. The concentration of C4–C5 hydrocarbons in the estuarine fresh waters is comparable with the high methane concentration (2–3 μl/l), drastically decreases in the zone of water mixing, and then rapidly increases to values several times higher than the methane concentration in seawater outside the outer boundary of the sedimentation depocenter of riverine particulate matter. A direct correlation was established for the concentration of the C4 + C5 homologues with the OM of the water mass, and the leading role was demonstrated to be played by labile OM of the autochthonous biomass (marine phytoplankton) in the genesis of higher hydrocarbon gases (alkenes, alkanes, and isoalkanes) during the early diagenetic stage of OM transformations in water. Along with the biomass of phytoplankton, a significant role in the genesis of C2–C3 hydrocarbons is played by destruction products of terrigenous OM. The destruction of OM and generation of gaseous hydrocarbons, including methane, are restricted to the pycnocline and the water-sediment interface. The absolute predominance of the sum of the C4 + C5 homologues in the hydrocarbon C2+ gases and the presence of unsaturated C2–C4 hydrocarbons are typical of the natural background of hydrocarbons of the Kara Sea water mass. 相似文献
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太阳星云凝集过程的岩石学模式：（Ⅱ）非球陨石,C1陨石及类C1陨石的凝… 总被引：3，自引：1，他引：3
综述了非球陨石（铁陨石、石铁陨石和无球粒陨石）在成分结构方面的非分异成因证据，推断其成因是：星云盘中心层中的星云发生气－液凝聚作用形成的熔滴，在较高温度下彼此合并形成了较大熔体，熔体固化后形成该类陨石母体。根据Ｃ１陨石不含球粒和其它成分特征。推断它们是星云只发生气－固凝集作用的产物。 相似文献
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淮南矿务局潘三矿自建井以来共发生十多次煤及瓦斯突出,给煤矿生产造成严重危害,通过对典型实例的描述、结合矿井地质资料的分析,认为媒矿及瓦斯突出与矿区的地质构造带有直接的关系,且分布范围局限,建议对地质构造应力较为集中的地带进行监控、分析、预测。 相似文献
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C1相干算法及其在三维地震勘探解释中的应用 总被引：4，自引：0，他引：4
作者在文中详细讨论了二维和三维C1相干算法，根据三维C1相干算法的特点，结合二维地震数据体的特点，考虑到三维地震勘探在各大矿区的全面普及，针对三维地震资料开发出了一套实用的应用程序进行相干处理和解释，通过对实际三维地震资料的处理，分析结果表明，C1相干技术对三维地震资料的构造，岩性解释有明显的效果。 相似文献
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Results of studies of the surface-brightness distributions of a group of young stellar objects located within 16″ of the star θ1 Ori C are presented. Isophotes around each proplyd are constructed using violet, red, and near-infrared images. No regularity in the sizes of the diametral cross sections of the proplyds in the various photometric bands is observed. The measured relative intensities are converted to absolute fluxes, and the absolute luminosities of the brightest parts of the disks and of the disk peripheries are estimated. The ratio of the semi-major to the semi-minor axes of the objects range from 1.5 to 2.5. The maximum lengths of the proplyd tails in various filters range from 300 to 700 AU. They become shorter with decreasing distance from the illuminating star, possibly due to enhanced dissipation of the disk, due to the growth in the role of photovaporization.
相似文献13.
羧甲基纤维素（即C.M.C）是一种被广泛应用于钻井泥浆中的一种处理剂，它主要是一种降失水与增粘剂，在低固相不分散性泥浆与分散性泥浆中均可使用，并能取得较好的效果，每年用量较大，据不完全统计，我国每年仅用于钻井泥浆中的用量就达6000吨左右（石油部门5000吨，地质、煤炭、冶金部门约用1000吨左右），但是长期以来，它存在一个突出的问题，是不易溶解，往往在钻探现场使用时，要予先浸泡较长时间后才能部份溶解，或者长期形成“面疙瘩”状，需加温后才能逐渐溶解，这样就给野外使用带来十分不便。七九年十月份，地质部赴日泥 相似文献
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A thermodynamic dataset for arsenic species in As–O–H–S–Fe–Ba system was compiled from the literature. Using this dataset,
Eh–pH diagrams for the systems As–O–H, As–O–H–S, As–O–H–S–Fe, As–O–H–Ba, and As–O–H–S–Fe–Ba were constructed at 25°C and 1 bar.
The inclusion of thioarsenite species in the systems As–O–H–S and As–O–H–S–Fe results in substantial differences from previously
published Eh–pH diagrams. There are considerable differences in the thermodynamic properties for orpiment, realgar, scorodite,
arsenopyrite, barium arsenate, and barium hydrogen arsenate, which result in vastly different stability fields when different
values are adopted. 相似文献
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C1相干算法是计算每道的横测线和相邻纵测线的互相关，依据相干值来判断地层和岩性的横向不均匀性。根据互相关原理，提出了相干体算法中二维和三维C1算法的内容及其具体实现。通过对实际三维地震资料的处理，结合已知地质资料，证明C1相干技术在三维地震资料的断层解释方面有着明显的效果。 相似文献
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The electrical conductivity of aqueous fluids containing 0.01, 0.1, and 1 M NaCl was measured in an externally heated diamond cell to 600 °C and 1 GPa. These measurements therefore more than double the pressure range of previous data and extend it to higher NaCl concentrations relevant for crustal and mantle fluids. Electrical conductivity was generally found to increase with pressure and fluid salinity. The conductivity increase observed upon variation of NaCl concentration from 0.1 to 1 M was smaller than from 0.01 to 0.1 M, which reflects the reduced degree of dissociation at high NaCl concentration. Measured conductivities can be reproduced (R 2 = 0.96) by a numerical model with log \(\sigma\) = ?1.7060– 93.78/T + 0.8075 log c + 3.0781 log \(\rho\) + log \(\varLambda\) 0(T, \(\rho\)), where \(\sigma\) is the conductivity in S m?1, T is temperature in K, c is NaCl concentration in wt%, \(\rho\) is the density of pure water (in g/cm3) at given pressure and temperature, and \(\varLambda\) 0 (T, \(\rho\)) is the molar conductivity of NaCl in water at infinite dilution (in S cm2 mol?1), \(\varLambda\) 0 = 1573–1212 \(\rho\) + 537 062/T–208 122 721/T 2. This model allows accurate predictions of the conductivity of saline fluids throughout most of the crust and upper mantle; it should not be used at temperatures below 100 °C. In general, the data show that already a very small fraction of NaCl-bearing aqueous fluid in the deep crust is sufficient to enhance bulk conductivities to values that would be expected for a high degree of partial melting. Accordingly, aqueous fluids may be distinguished from hydrous melts by comparing magnetotelluric and seismic data. H2O–NaCl fluids may enhance electrical conductivities in the deep crust with little disturbance of v p or v p/v s ratios. However, at the high temperatures in the mantle wedge above subduction zones, the conductivity of hydrous basaltic melts and saline aqueous fluids is rather similar, so that distinguishing these two phases from conductivity data alone is difficult. Observed conductivities in forearc regions, where temperatures are too low to allow melting, may be accounted for by not more than 1 wt% of an aqueous fluid with 5 wt% NaCl, if this fluid forms a continuous film or fills interconnected tubes. 相似文献
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测定地下水年龄的最新方法——~(30)C1法 总被引：1，自引：0，他引：1
本文介绍了用~(36)Cl法测定地下水年龄的最新方法,概述了~(36)Cl的起源、~(36)Cl的分布特征及其计时原理,~(36)Cl计时中值得注意的问题。 相似文献
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综述了非球陨石（铁陨石，石铁陨石和无球粒陨石）在成分结构方面的非分异成因证据，推断其成因是：星云盘中心层中的星云发生气－液凝聚作用形成的熔滴，在较高温度下彼此合并形成了较大熔体，熔体固化后形成该类陨石母体。根据Ｃ１陨石不含球粒和其它成分特征，推断它们是星云只发生气－固凝聚作用的产物。对近年来新发现的一些特殊成分的碳质球粒陨石进行了综合分析，暂定名为类Ｃ１陨石。通过类Ｃ１陨石与其它球粒陨石及Ｃ１陨石成分结构特征的对比，推断它们是星云盘边缘层星云发生气－液－固和气－固联合凝聚作用，同时发生水化作用的产物。最后，在对所有陨石凝聚成因进行解释的基础上，建立了小行星区星云凝聚模型。 相似文献
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N. I. Kovalenko B. N. Ryzhenko N. I. Prisyagina Ya. V. Bychkova 《Geochemistry International》2011,49(3):262-273
Uraninite solubility in 0.001–2.0 m HCl solutions was experimentally studied at 500°C, 1000 bar, and hydrogen fugacity corresponding to the Ni/NiO buffer. It
was shown that the following U(IV) species dominate in the aqueous solution: U(OH)40, U(OH)2Cl20, and UOH Cl30 Using the results of uraninite solubility measurement, the Gibbs free energies of U(IV) species at 500°C and 1000 bar were
calculated (kJ/mol): −9865.55 for UO2(aq), −1374.57 for U(OH)2 Cl20, and −1265.49 for UOH Cl30, and the equilibrium constants of uraninite dissolution in water and aqueous HCl solutions were estimated: UO2(cr) = UO2(aq), pK
0 = 6.64; UO2(cr) + 2HCl0 = U(OH)2 Cl20, pK
2 = 3.56; and UO2(cr) + 3HCl0 = UOHcl30 + H2O, pK
3 = 3.05. The value pK
1 ≈ 5.0 was obtained as a first approximation for the equilibrium UO2(cr) + H2O + HCl0 = U(OH)3Cl0. The constant of the reaction UO2(cr) + 4HCl0 = UCl40 + 2H2O (pK
4 = 7.02) was calculated taking into account the ionization constants of U Cl40 and U(OH)40, obtained by extrapolation from 25 to 500°C at 1000 bar using the BR model. Intense dissolution and redeposition of gold
(material of experimental capsules) was observed in our experiments. The analysis and modeling of this phenomenon suggested
that the UO2 + x
/UO2 redox pair oxidized Au(cr) to Au+(aq), which was then reduced under the influence of stronger reducers. 相似文献
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对取自南海北部陆坡“海洋四号沉积体”的DSH-1C柱状样,进行了沉积学和磁学分析,结合相关资料探讨了该柱状样沉积物磁性特征的纵向变化及其与该区沉积环境变化的关系。结果表明：DSH-1C柱状样自上而下共划分为3个岩性单元,表层沉积物为全新世氧同位素1期(MIS1)以粘土质粉砂为主的深海-半深海沉积;中部含数层重力流沉积夹层为晚更新世氧同位素2期(MIS2)沉积;底部为晚更新世氧同位素3期(MIS3)粘土质粉砂。该柱状样磁化率(χ)平均值为1.72×10-7 m3/kg。所有样品的等温剩磁(IRM)均已达到饱和等温剩磁(SIRM)的80%以上,S300的最小值为0.605。该柱状样沉积物中的磁性矿物极少,以低矫顽力矿物为主;在陆源物质输入较多的间冰期(MIS1和MIS3期),其磁性参数值较高;反之,在MIS2其磁性参数值较低,可能与冰期该区陆源物质减少有关。此外,该岩心柱中富含有孔虫壳体或双壳碎屑的重力流层沉积物的磁性参数值低,与这些逆磁性碳酸盐组分的增加有关。 相似文献