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1. chinaXiv:202001.00045 [pdf]

Approximation-Degree-Based Interpolation: A New Interpolation Method

廉师友
Subjects: Mathematics >> Numerical Analysis

This paper introduces the measure of approximate-degree and the concept of approximate-degree function between numerical values, thus developing a new interpolation method —— approximation-degree-based interpolation, i.e., AD interpolation. One-dimensional AD interpolation is done directly by using correlative interpolation formulas; n(n>1)-dimensional AD interpolation is firstly separated into n parallel one-dimensional AD interpolation computations to do respectively, and then got results are synthesized by Sum-Times-Difference formula into a value as the result value of the n-dimensional interpolation. If the parallel processing is used, the efficiency of n-dimensional AD interpolation is almost the same as that of the one-dimensional AD interpolation. Thus it starts a feasible and convenient approach and provides an effective method for high-dimensional interpolations. Furthermore, if AD interpolation is introduced into machine learning, a new instance-based learning method is expected to be realized.

submitted time 2019-12-29 Hits9273Downloads458 Comment 0

2. chinaXiv:201705.00837 [pdf]

渭河新生代盆地基底组成及其油气地质意义

李玉宏; 张文; 袁炳强; 韩伟; 陈高潮; 卢进才; 张林; 许海红; 赵峰华
Subjects: Energy Science >> Energy Science (General)

河盆地有无天然气一直是地学界研究的热点问题之一,而该问题的关键是有无气源岩的存在。为进一步评价因缺乏有效烃源岩而停顿多年的渭河盆地的油气地质前景,结合区域地质背景,通过二维地震反射特征、地热井伴生气及油气化探的CH4、CO2碳同位素数据和钻探成果综合分析,认为渭河盆地深部残留有晚古生代含煤地层:①二维地震反射剖面揭示,渭河盆地深部发育类似鄂尔多斯盆地石炭系—二叠系煤系地层特有的强反射特征(T9),对应于太原组9#、8#和山西组4#、3#主力煤层反射;②地热井伴生气及油气化探样品中δ13CH4在-24.5‰ ~ -40.2‰之间,属于煤型热解—裂解气,大多数样品δ13 Cco2<-10‰,属有机成因气;③渭参3井揭示盆内存在上古生界二叠系石盒子组,推测下部存在山西组和太原组地层;④渭河盆地在晚古生代为大华北克拉通的一部分,沉积有煤系地层,三叠纪末期开始遭受一定的隆升剥蚀,至新生代渭河断陷盆地开始形成,盆地周缘发生大规模隆升剥蚀,而渭河盆地内这一时期接受了巨厚沉积,前新生代地层(上古生代煤系地层等)得以保存和深埋,即构造演化的差异造成了不同构造单元地层剥蚀和残留程度的差异。综合认为晚古生代煤系地层甚至更晚层位存在于渭河盆地的西安凹陷、固市凹陷和咸渭凸起的部分区域。渭河盆地晚古生代含煤地层可作为油气及氦气载体气的气源岩,为渭河盆地油气及富氦天然气勘探提供了物质基础,同时可为鄂尔多斯周缘断陷盆地群油气资源调查提供借鉴。

submitted time 2017-05-15 Hits19491Downloads2109 Comment 0

3. chinaXiv:201703.01174 [pdf]

陕北高含硫采油污水腐蚀特性研究

马云; 任鹏
Subjects: Materials Science >> Materials Science (General)

以陕北某作业区高含硫采出水水质组成为参照,配置模拟高含硫采油污水研究其对J55管材的腐蚀特性。实验通过改变H2S压力、pH值、溶解氧、不同离子浓度,考察了各因素对J55管材腐蚀速率的影响,并通过扫描电镜与能谱分析研究了腐蚀挂片的形貌与元素组成的差异。结果表明:在H2S压力小于0.30MPa的实验范围内,J55钢的腐蚀速率随着H2S压力的增大而增大;溶解氧是造成高含硫采油污水腐蚀的主要影响之一;在pH值7.0~7.5之间存在一个突变点,当pH值小于这个突变点的pH值时,J55钢在含H2S溶液中的腐蚀速率随pH值降低而显著增加;当pH>7.5时,腐蚀速率变化幅度不明显且腐蚀速率均小于0.05mm/a;在现场污水pH值变化范围(6.0~8.5)内的高含硫水中,无论偏酸抑或偏碱性,SO42-对高含硫污水中J55的腐蚀基本没有影响,CO32-、HCO3-的加入会增加其腐蚀性,酸性条件下加入S2-腐蚀速率明显增大,偏碱性加入S2-对腐蚀基本没有影响。

submitted time 2017-03-31 From cooperative journals:《腐蚀科学与防护技术》 Hits28324Downloads585 Comment 0

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