基于多图的交替优化图直推方法

针对基于单图的半监督学习(GSSL)算法的性能受单个图质量的影响,且在单视图数据下,大多数基于多图的GSSL算法难以使用的问题,提出了一种基于多图的交替优化图直推方法(MG-GTAM)。首先,使用不同的图构建参数来构建单视图数据下的多个图,利用多个图来表达数据间关系;然后,借助交替迭代方式综合多个图的信息,选择置信度高的未标记样本进行伪标记并通过权重权衡各图的重要程度,以优化多图上的预测函数的一致性和平滑性;最后通过组合每个图的预测函数完成对所有未标记样本的标记。仿真实验表明,与经典的局部和全局一致(LGC)、高斯随机场和调和函数(GFHF)、交替优化直推(GTAM)、组合图拉普拉斯(CGL)算法相比,在COIL20目标物体数据集和NEC Animal数据集上,MG-GTAM的分类错误率比这些经典算法均有下降,表明了该方法具有良好的性能。实验结果表明, MG-GTAM能有效地利用多个图来表达数据之间的关系,获得更低的分类错误率。     

氰酸酯树脂的性能和应用

本文介绍了氰酸酯树脂的合成，性能和应用情况。     

一种聚羧酸系减水剂大单体MPEGMA及掺入水泥的研究

采用油浴法,以甲基丙烯酸、聚乙二醇单甲醚为主要原科,以甲苯为带水剂、对甲苯磺酸为催化剂,对苯二酚为阻聚剂,通过酯化反应合成出甲基丙烯酸聚乙二醇单酯活性大单体.确定出最佳反应条件为:原料酸醇摩尔比为3:1,催化剂对甲基苯磺酸的用量为3%(以聚乙二醇单甲醚的质量计),阻聚剂对苯二酚的用量为0.5%(以甲基丙烯酸的质量计),...     

染料水溶液的辐射降解研究

辐射技术处理环境污染物显示了很大的应用前景,燃煤烟气脱硫脱硝、挥发性有机物净化、废污水处理、污泥消毒和处置等正在逐步走向工业应用。本工作进行印染废水辐照处理研究。     

Robust Interface Ru Centers for High-Performance Acidic Oxygen Evolution

RuO₂ is considered as the state-of-the-art electrocatalyst for the oxygen evolution reaction (OER) in acidic media. However, its practical application is largely hindered by both the high reaction overpotential and severe electrochemical corrosion of the active centers. To overcome these limitations, innovative design strategies are necessary, which remains a great challenge. Herein, robust interface Ru centers between RuO₂ and graphene, via a controllable oxidation of graphene encapsulating Ru nanoparticles, are presented to efficiently enhance both the activity and stability of the acidic OER. Through precisely controlling the reaction interface, a much lower OER overpotential of only 227 mV at 10 mA cm⁻² in acidic electrolyte, compared with that of 290 mV for commercial RuO₂, but a significantly higher durability than the commercial RuO₂, are achieved. Density functional theory (DFT) calculations reveal that the interface Ru centers between the RuO₂ and the graphene can break the classic scaling relationships between the free energies of HOO* and HO* to reduce the limiting potential, rendering an enhancement in the intrinsic OER activity and the resistance to over-oxidation and corrosion for RuO₂.     

In Situ Fabrication of Highly Luminescent Bifunctional Amino Acid Crosslinked 2D/3D NH3C4H9COO(CH3NH3PbBr3)n Perovskite Films

The perovskite quantum dots are usually synthesized by solution chemistry and then fabricated into film for device application with some extra process. Here it is reported for the first time to in situ formation of a crosslinked 2D/3D NH₃C₄H₉COO(CH₃NH₃) _n Pb_n Br_3n perovskite planar films with controllable quantum confine via bifunctional amino acid crosslinkage, which is comparable to the solution chemistry synthesized CH₃NH₃PbBr₃ quantum dots. These atomic layer controllable perovskite films are facilely fabricated and tuned by addition of bi‐functional 5‐aminovaleric acid (Ava) of NH₂C₄H₉COOH into regular (CH₃NH₃)PbBr₃ (MAPbBr₃) perovskite precursor solutions. Both the NH₃⁺ and the COO^? groups of the zwitterionic amino acid are proposed to crosslink the atomic layer MAPbBr₃ units via Pb? COO bond and ion bond between NH₃⁺ and [PbX₆] unit. The characterizations by atomic force microscopy, scanning electron microscopy, Raman, and photoluminescence spectroscopy confirm a successful fabrication of ultrasmooth and stable film with tunable optical properties. The bifunctional crosslinked 2D/3D Ava(MAPbBr₃)_n perovskite films with controllable quantum confine would serve as distinct and promising materials for optical and optoelectronic applications.     

基于组合预测模型的露天矿高陡边坡滑坡变形研究

随着露天矿山开采规模及深度的不断扩大,致使矿山边坡变陡、变高,而形成高陡边坡,但由于地质条件以及矿山施工等因素的影响,高陡边坡经常发生崩塌、滑坡等比较严重的地质灾害。因此,为加强对露天矿山高陡边坡的变形预测,应及时研究滑坡的变化趋势,开展滑坡预警,指导矿山生产,保障人民的生命财产安全。建立了一种能够更加有效地反映出变形体变化趋势的组合预测模型,并介绍了其建模思想及计算方法,在此基础上,依据某高陡边坡实际监测数据,将其预测结果与独立预测模型的预测结果进行分析比较,结果显示,其精度要优于独立预测模型的精度,且可靠性更高,具有较强的适用性。     

水平气井不稳定产能分析

水平井能够数倍地增加储层泄气面积,有效提高气井产量,准确预测水平气井产能有助于合理开发产层,提高气藏采出程度。基于气体不稳定渗流理论,应用Newman乘积原理和Green函数得到了水平气井不稳定压降解析解。分别用半解析法和解析法对模型进行求解,对比讨论了如何取得合理的均流量点,并分析了水平气井产能随时间的变化规律。研究表明：沿水平井段单位长度井筒流量呈＂U＂型分布,随时间增加,＂U＂型面加深,均流量点从井筒两端向井筒中部移动,最后稳定在一点;根据半解析法得到的均流量点,用解析法对比误差不超过2%,产气量随时间的增加而不断减小,后趋于一定值,流动达到拟稳态。     

鄂尔多斯盆地大牛地致密砂岩气田水平井开发气藏工程优化技术

大牛地气田属致密砂岩气田,剩余未动用储量品位差、有效厚度薄、纵向叠合程度低,采用水平井开发效果较好,但国内没有成熟的开发技术和经验。因此,优化研究水平井开发技术政策,完善气藏工程配套技术显得尤为重要。为此,基于经验公式、动态分析、数值模拟、经济评价等方法,对水平井整体开发动用条件下的产能评价、单井设计、井网井距等开发技术政策进行了优化研究,明确了层系划分原则,确定了多种产能评价方法,明确了气井配产比例为无阻流量的1/5～1/3,水平段长1 000～1 200 m,轨迹应垂直于最大主应力方向并尽量位于储层中部,压裂缝设计应参照定量计算模型,井网采用排状交错井网,井距800～1 200 m,废弃地层压力8 MPa,采收率40%。形成的气藏工程优化技术,已应用于大牛地气田水平井整体开发方案中,为方案成功实施提供了技术保障。     

基于虚拟水的出库水和人均淡水消费的量价关系

基于虚拟水理论推导出人均淡水消费水量与水库出库水量的关系及人均淡水水费支出与水库出库水量、水价的关系,进而总结出需要控制人口增长率、提高渠系水利用率、缓步推进水价改革等结论.