陕西省国有地勘单位改革发展刍议

党的十八届三中全会作出了全面深化改革的战略部署,国有地勘单位改革也随之进入攻坚期、深水区。如何借鉴经验教训,深化国有地勘单位改革,这值得深思。陕西省国有地勘单位在全国率先统一由事业单位改制为国有企业,在国有地勘单位改革中形成了"陕西模式"。本文概述了陕西省国有地勘单位改革发展历程,分析了在改革主导、管理体制、运行机制和变革途径等方面呈现的改革特点,梳理了在构建现代企业架构、激发市场化经营思维、拓宽服务领域、增强地勘企业经济效益和建实省级公益性地勘队伍等方面取得的改革成效。文章认为,当前市场环境、现有顶层设计以及自身发展基础等均不利于改制后的国有地勘单位发展壮大,国有地勘单位企业化改革的"陕西模式"面临升级。     

Holocene palaeoflood events recorded by slackwater deposits along the middle Beiluohe River valley,middle Yellow River basin,China

Palaeohydrological investigations were carried out in the middle Beiluohe River valley in the middle Yellow River basin. Palaeoflood slackwater deposits (SWDs) are natural records of overbank flooding and are often identified in the Holocene aeolian loess–soil profiles along the river valley. Three bedsets of palaeoflood SWDs were found within the mid‐Holocene Climatic Optimum palaeosol (S₀) on the right riverbank. Both the sedimentary and the analytical results, including magnetic susceptibility, grain‐size distribution and concentrations of chemical elements, indicate that these palaeoflood SWDs were deposited from the suspended sediment load of overbank flooding. We identified three episodes of extraordinary overbank flooding events. These hydro‐climatic events were dated to 7600–7400, 5800–5000 and 4200–4000 a BP, from optically stimulated luminescence (OSL) dating and pedostratigraphical correlation. The minimum flood peak discharges were estimated to have been between 12 600 and 14 100 m³ s^?1 using the slope–area method. These hydro‐climatic events are considered to be a regional expression of known climatic events and demonstrate that the mid‐Holocene climate was far from stable. These results show that the magnitudes of floods are highly sensitive to climate change in semi‐arid and sub‐humid regions with a monsoonal climate.     

准噶尔盆地陆梁地区水化学特征与油气运聚

陆梁地区内水文环境从深部到浅部有明显变化,发育多向型水化学剖面。深部为较高矿化度的CaCl2 型地层水,浅层为较低矿化度的CaCl2 型地层水,中层发育低—高矿化度的NaHCO3型水。地层水的这种剖面分布形式与深层逆断裂和中 浅部的正断裂有着密切的关系。据此将研究区划分为 3个水文地质旋回,每个旋回有着不同的水化学特征及发育不同的水化学剖面。研究区的水动力场与油气运聚关系十分密切,早期主要流向是西北至东南及西南至东北方向,中-晚期主要流向是西南至东北方向,与油气运移方向基本一致。     

Decoupling and decomposing analysis of construction industry’s energy consumption in China

Natural Hazards - The construction industry is one of the key industries for driving energy conservation in China. Decoupling of the construction industry development from energy consumption has...     

锦州地震台体应变观测资料阶变分析

前兆观测曲线中出现种阶跃变化,简称阶变,实际体应变分钟值观测曲线在地震发生前后记录到的阶变是地下应力应变急剧调整的一种特殊运动变化的过程。研究分析阶变各种形态,对于探索这些区域再次发生地震的预测研究有实际意义。     

农业地质前景在于地质与大农业的结合

通过对地质在大农业中的应用实践和潜在的应用需求进行综合分析与讨论,为农业地质的发展展现出广阔的前景,就地质与大农业的结合提供了事实和理论依据,并以此归结出农地结合（ 即地质应用于农业） 的主要领域及其相应的农业地质工作、研究内容和相关学科。     

Molecular Orbital Study on the Optimized Geometries and Spectroscopic Parameters of Borate Polyhedra

In this paper several methods including MNDO, multiple scattering Xα and ab initio self-consistent-field MO theories have been used to calculate the minimum energy geometries, force constants, vibrational frequencies ,and ^11B quadruple coupling constants of B-O polyhedra such as [BO3],[BO4],[OB2] and [OB3].The results are in good agreement with the experimental and calcu-lated values so far published by other authors.     

Behavior of expansive soils stabilized with fly ash

Expansive soils cause serious problem in the civil engineering practice due to swell and shrinkage upon wetting and drying. Disposal of fly ash, which is an industrial waste in both cost-effective and environment-friendly way receives high attention in China. In this study, the potential use and the effectiveness of expansive soils stabilization using fly ash and fly ash-lime as admixtures are evaluated. The test results show that the plasticity index, activity, free swell, swell potential, swelling pressure, and axial shrinkage percent decreased with an increase in fly ash or fly ash-lime content. With the increase of the curing time for the treated soil, the swell potential and swelling pressure decreased. Soils immediately treated with fly ash show no significant change in the unconfined compressive strength. However, after 7 days curing of the fly ash treated soils, the unconfined compressive strength increased significantly. The relationship between the plasticity index and swell-shrinkage properties for pre-treated and post-treated soils is discussed.     

有机包裹体在油气运移研究中的应用综述

系统总结了有机包裹体在研究油气运移时间、通道、方向、期次等方面的最新成果 ,介绍了近年来有机包裹体成分在确定油气来源、运移期次方面所取得的进展 ,并对存在的主要问题和发展趋势作了评述。     

Introduction to Large High Altitude Air Shower Observatory (LHAASO)

Since the century discovery of cosmic ray, the origin of cosmic ray is always a mystery. The study on the origin of high-energy cosmic ray is in an interdiscipline between the very high-energy (VHE) gamma-ray astronomy and the cosmic ray physics. The Large High Altitude Air Shower Observatory (LHAASO) is a unique and new generation cosmic-ray station with the advantages of high altitude, all-weather, and large-scale. It takes the function of hybrid technology to detect cosmic rays and to upgrade greatly the resolving power between gamma rays and cosmic rays. The LHAASO is expected to make the full-sky survey to find new gamma-ray sources, to obtain the highest sensitivity of gamma-ray detection at the high energy band of > 30 TeV, and to make the very high precision measurement on the component energy spectra of cosmic rays in a broad energy range of 5 orders of magnitude, in order to provide the evidence for revealing the mystery of the origin of cosmic ray. This paper describes the detector structure, performance superiority and scientific motivation of the LHAASO.