基于拉普拉斯金字塔融合的岩心图像拼接算法

针对岩心图像拼接效率低以及易出现鬼影现象的问题,提出了一种基于最佳缝合线的拉普拉斯金字塔融合的岩心图像拼接方法.首先将待拼接的两幅岩心图像进行灰度变换,根据ORB算法计算并描述特征点;其次使用改进的random sample consensus (RANSAC)算法对特征点进行提纯,完成特征点匹配;根据匹配的特征点计算图像间的配准关系,最后根据最佳缝合线实现岩心图像的拉普拉斯金字塔融合,完成拼接.实验结果表明,改进的RANSAC算法能在保证正确率的同时提升速度,而且本文提出的图像融合方法避免了鬼影的产生,在融合区域的PSNR、SSIM和DoEM客观评价指标上与另外两种图像融合算法相比都有所提升.     

山西某金云母矿床特征及综合利用研究

本文在对山西某金云母矿床基本特征概述的基础上,侧重于云母原矿加工和尾矿回收提纯及其云母粉有针对性的开发应用提出建议.同时还对云母粉在相关领域中的应用机理进行了客观探讨,这将对碎云母及其粉体,深层次的应用起到一定借鉴作用.     

Regulation of high-efficient regeneration of sodium borohydride by magnesium-aluminum alloy

Sodium borohydride (NaBH₄) is considered to be an excellent hydrogen-generation material via hydrolysis. However, it remains challenge to regenerate it after hydrolysis in practical applications. Therefore, a low-cost regeneration method from hydrolysis by-products for recycling is the key issue. In this study, NaBH₄ was successfully regenerated by direct high-energy ball milling of magnesium alloy (Mg₁₇Al₁₂) and hydrolysis by-product NaBO₂·2H₂O with addition of a small amount of NaH. Notably, unlike traditional method, here there is no need of adding extra hydrogen and the H⁻ in the regenerated NaBH₄ is mainly from the H⁺ in the coordinated water. It was found that through adding a small amount of NaH, the highest yield may reach 57% after optimizing the regeneration process. In addition, it is the first time we found that not only Mg can participate in the reaction, but also Al; and the addition of NaH can promote the reaction. Furthermore, the regeneration mechanism of NaBH₄ was analyzed and the transition pattern [B(OH)₄]⁻/[BH₃(OH)]⁻/[BH₄]⁻ was successfully observed during the regeneration process. It is worth emphasizing that NaBH₄ can be regenerated through ball milling method, which is energy-saving and suitable for up-scaling in the future.     

无机矿物填充材料发展趋势及前景展望

本文在扼要阐述无机矿物粉体及其复合矿物填料基础上,侧重对复合矿物填料产生的"协同效应"及其特性进行探讨,与此同时还对"界面现象"以及接枝技术的应用进行了初步展示。文中对企业的发展趋势和方向做出明确论述并提出联合协作的建议,供相关企业参考。     

黑龙江沙河子地区中侏罗世岩体地质地球化学特征及成因探讨

黑龙江沙河子地区岩浆活动强烈,主要岩体为似斑状黑云英云闪长岩、正长花岗岩、碱长花岗岩,通过对岩体进行锆石年龄分析测试和岩石地球化学的分析研究,结果表明似斑状黑云英云闪长岩、正长花岗岩、碱长花岗岩形成时代为中侏罗世。中侏罗世正长花岗岩—碱长花岗岩是同源岩浆经历了平衡部分熔融—结晶分异作用形成。中侏罗世岩体随SiO_2含量的增加,岩石从似斑状黑云英云闪长岩—正长花岗岩—碱长花岗岩,岩石由钙碱性演化为碱性,DI值进一步升高,SI值进一步降低,显示岩浆结晶分异程度愈来愈高,演化更彻底的特点。似斑状黑云英云闪长岩具有I-S型花岗岩特征,属于壳幔混合成因。中侏罗世正长花岗岩—碱长花岗岩,属于高钾钙碱性花岗岩类,具有A型花岗岩的特征,其形成与后造山—造山后构造环境相关。     

CeO2 supported multimetallic nano materials as an efficient catalyst for hydrogen generation from the hydrolysis of NaBH4

Nowadays, there is still no suitable method to store large amounts of energy. Hydrogen can be stored physically in carbon nanotubes or chemically in the form of hydride. In this study, sodium borohydride (NaBH₄) was used as the source of hydrogen. However, an inexpensive and useful catalyst (Co–Cr–B/CeO₂) was synthesized using the NaBH₄ reduction method and its property was characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), x-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) measurements. The optimized Co–Cr–B/CeO₂ catalyst exhibited an excellent hydrogen generation rate (9182 mLg_metal⁻¹min⁻¹) and low activation energy (35.52 kJ mol⁻¹). The strong catalytic performance of the Co–Cr–B/CeO₂ catalyst is thought to be based on the synergistic effect between multimetallic nanoparticles and the effective charge transfer interactions between the metal and the support material.     

Dynamic Fusion Algorithm of Building Surface Data in Heterogeneous Environment

Mobile Networks and Applications - The existing building surface data fusion algorithms do not extract the segmented data features, resulting in inaccurate fusion results. In heterogeneous...     

Trichloroisocyanuric acid (TCCA) as a mild and efficient catalyst for the trimethylsilylation of alcohols and phenols with hexamethyldisilazane (HMDS) under heterogonous conditions

A novel and efficient method for the trimethylsilylation of various alcohols and phenols with hexamethyldisilazane (HMDS) catalyzed by trichloroisocyanuric acid (TCCA) in good to excellent yields in dichloromethane at room temperature was described.