PDC钻头在寺河煤矿瓦斯预抽放钻井中的应用

在寺河矿区一期瓦斯地面预抽放钻井施工中，使用传统的镶齿三牙轮钻头钻进，钻进速度低，仅为2.0m／h，且井斜不易控制、钻头寿命短、成本较高。通过对寺河煤矿地层特征的分析，在二期工程施工中，9#煤以上地层优选六翼内凹式PDC钻头钻进，采取一定技术措施并合理调整钻压、转速及泵量等钻进参数，钻速可达7．0m/h，井斜也得到有效控制，降低了钻井成本。     

海藻中类胡萝卜素的提取及含量测定

许多研究已经表明，类胡萝卜素是分布最广泛、最重要的一类光辅助合成色素。类胡萝卜素具有多种生物学功能：作为化学保护剂可抵抗由植物自身叶绿素的光敏氧化作用引起的有害作用，给人体补充β-胡萝卜素可有效降低心血管疾病和癌症的发生概率，高摄入富含类胡萝卜素的饮食和降低白内障发生的危险之间有重要联系(Bendich，1993)。海藻中含有丰富的类胡萝卜素，从结构类型说，通常可以分为三类：胡萝卜素、叶黄素和类胡萝卜素酸。海藻中还含有多种特有的类胡萝卜素，如褐藻黄素、甲藻黄素、硅藻黄素等。直到目前为止，海藻中类胡萝卜素的组成与生理学功能尚没有明确的结论，因而对我国丰富的海藻资源中的类胡萝卜素进行较为系统和全面的化学及生物活性研究已成为摆在我们面前的一个重要课题。本研究选取我国青岛海滨三类大型经济海藻——红、绿、褐藻中资源量丰富的代表性种类作为实验材料，较系统地测定了其中类胡萝卜素的含量，并运用经典的柱层析法对各类胡萝卜素组分进行了分离，通过薄层分析和可见光谱扫描对各分离组分进行了定性、定量分析。     

鄱阳湖流域史前人类遗址时空分布及其环境响应（英文）

The temporal-spatial geographic distribution of archaeological sites and its feature between 10.0–2.8 ka BP(ka BP= thousands of years before 0 BP, where "0 BP" is defined as the year AD 1950) were determined, based on GIS spatial analysis in the Poyang Lake Basin. The relationship between geographic distribution of sites of different periods under subsistence existence of ancient civilizations, climate and environmental change was investigated. The results revealed numerous archaeological sites of the Neolithic Age(10.0–3.6 ka BP). The sites were mainly located in the northern part of the Poyang Lake Basin, a hilly and mountainous area with many river terraces suitable for the development of human civilization. The number of archaeological sites rapidly increased during the Shang and Zhou dynasties(3.6–2.8 ka BP) and spread widely on the floodplains of the middle and lower reaches of Ganjiang River and onto the west, south, and southeast beach areas of the Poyang Lake. Holocene records of climate change suggested that it was possible that climate fluctuations had a great impact on human evolution in the study area. Before 3.6 ka BP, westward and northward expansion of Neolithic cultures in the Poyang Lake watershed occurred under the background of climate amelioration(becoming warmer and wetter). The ancient people lived in the hilly areas with high elevation. The simple mode of a fishing and gathering economy was mostly suited to this area in the early Neolithic Age. The scope of human activities was expanded and cultural diversity developed in the late Neolithic Age. However, with population growth and increasing survival pressure in a dry-cold climatic stage after 3.6 ka BP, this simple living mode had to be abandoned, and various forms of economy, the majority being agriculture, were developed on flood plains of the lower reaches of numerous rivers around Poyang Lake. This promoted flourishing of the Bronze culture of South China.     

PELIMINARY ANALYSES FOR CROP WATER CONSUMPTION BY USING LYSIMETER

Ｉ.ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅＨｕａｎｇ-Ｈｕａｉ-ＨａｉＰｌａｉｎｉｎＮｏｒｔｈＣｈｉｎａｉｓａｃｒｕｃｉａｌａｒｅａｉｎｐｒｏｖｉｄｉｎｇａｂｏｕｔｏｎｅ-ｆｉｆｔｈｏｆｔｏｔａｌｓｔａｔｅｆｏｏｄ[4],ａｎｄｉｔｉｓｆａｃｉｎｇａｓｅｒｉｏｕｓｗａｔｅｒｓｈｏｒｔａｇｅｉｎｒｅｃｅｎｔｙｅａｒｓｄｕｅｔｏｔｈｅｅｘｐａｎｓｉｏｎｏｆｉｎｄｕｓｔｒｙａｎｄａｃｏｎｔｉｎｕｏｕｓｄｅｃｒｅａｓｅｉｎｐｒｅｃｉｐｉｔａｔｉｏｎ.Ｔｈｅｓｔｕｄｙｉｎｓｏｉｌ-ｐｌａｎｔ-ａｔｍｏｓｐｈｅｒｅｃｏｎｔｉ…     

晶体生长机理

从扩散控制，成核控制，位错控制和综合控制等几个方面阐述了自溶液中生长晶体的晶体生长机理．     

非开挖管道翻衬修复技术用树脂的研究

本课题针对非开挖管道翻衬修复技术用树脂进行了设计,根据管状织物织造工艺、翻衬修复管道工艺对树脂的要求,及DSC扫描结果、等温和动态黏度变化试验的实验结果进行分析,选择合理树脂的配方;通过手糊方法使得涂层织物与树脂体系进行复合,对聚氨酯树脂与织物和金属粘结机理进行分析。并对树脂体系与金属粘结强度进行测试,确定聚氨酯树脂与金属管壁粘结性能,为今后将非开挖管道翻衬修复技术应用到具体施工时,选择合适的树脂提供理论依据和操作方案。     

X射线荧光分析技术在喀拉通克铜镍矿井下现场品位测定

文章主要介绍应用 X射线荧光现场取样技术在新疆喀拉通克铜镍矿井下现场测定铜镍品位 ,快速评价矿石质量和降低工人劳动强度的方法和效率     

藏南错那洞淡色花岗岩中电气石矿物学和地球化学特征

错那洞淡色花岗岩与错那洞穹隆及周边的铅锌和钨锡铍矿床具有时空上的密切关系.含电气石淡色花岗岩是错那洞高分异淡色花岗岩的代表性岩石.岩相学研究表明,错那洞电气石可分为GT型和PT型两类.本次研究利用电子探针以及LA-ICP-MS分析两种类型电气石的化学组成.结果表明,GT型电气石中Fe/(Fe+Mg)原子比值为0.83～...     

储层砂岩声波速度预测

本文主要基于Ｇａｓｓｍａｎｎ方程和经验规律，提出了孔隙流体替代和孔隙度改变时对砂央地震波速度变化的估计，以及直接利用岩石矿物和孔隙流体的弹性性质计算砂岩地震波速度方法，利用已知的岩芯，测井或地震数据，运用这此方法，可合理地对储层砂岩地震波速度进行预测。     

Seasonal variability of oxygen and hydrogen isotopes in a wetland system of the Yunnan-Guizhou Plateau,southwest China: a quantitative assessment of groundwater inflow fluxes

The Caohai Wetland serves as an important ecosystem on the Yunnan–Guizhou Plateau and as a nationally important nature reserve for migratory birds in China. In this study, surface water, groundwater and wetland water were collected for the measurement of environmental isotopes to reveal the seasonal variability of oxygen and hydrogen isotopes (δ¹⁸O, δD), sources of water, and groundwater inflow fluxes. Results showed that surface water and groundwater are of meteoric origin. The isotopes in samples of wetland water were well mixed vertically in seasons of both high-flow (September) and low-flow (April); however, marked seasonal and spatial variations were observed. During the high-flow season, the isotopic composition in surface wetland water varied from ?97.13 to ?41.73‰ for δD and from ?13.17 to ?4.70‰ for δ¹⁸O. The composition of stable isotopes in the eastern region of this wetland was lower than in the western region. These may have been influenced by uneven evaporation caused by the distribution of aquatic vegetation. During the low-flow season, δD and δ¹⁸O in the more open water with dead aquatic vegetation ranged from ?37.11 to ?11.77‰, and from ?4.25 to ?0.08‰, respectively. This may result from high evaporation rates in this season with the lowest atmospheric humidity. Groundwater fluxes were calculated by mass transfer and isotope mass balance approaches, suggesting that the water sources of the Caohai Wetland were mainly from groundwater in the high-flow season, while the groundwater has a smaller contribution to wetland water during the low-flow season.