让粉煤灰与城市生活垃圾“联姻”

粉煤灰与城市生活垃圾是固体废物中两大主体。生产粉煤灰砌块要消耗大量热能，而垃圾中的化学能正好可以满足这一需要。若把两者组合在一起，不仅可节约大量煤炭，降低砌块成本，而且也为垃圾资源化提供了新的途径。     

基于CDIO理念的应用化学专业生产实习教学改革

在CDIO理念的指导下,对应用化学专业生产实习教学进行改革,提高了生产实习教学质量,有效地培养了学生工程实践能力、创新意识以及团队协作精神。     

Growth of strained-Si material using low-temperature Si combined with ion implantation technology

In order to fabricate strained-Si MOSFETs, we present a method to prepare strained-Si material with high-quality surface and ultra-thin SiGe virtual substrate. By sandwiching a low-temperature Si (LT-Si) layer between a Si buffer and a pseudomorphic Si0.08Ge0.2 layer, the surface roughness root mean square (RMS) is 1.02 nm and the defect density is 106 cm-2 owing to the misfit dislocations restricted to the LT-Si layer and the threading dislocations suppressed from penetrating into the Si0.08Ge0.2 layer. By employing P+ implantation and rapid thermal annealing,the strain relaxation degree of the Si0.08Ge0.2 layer increases from 85.09% to 96.41% and relaxation is more uniform. Meanwhile, the RMS (1.1 nm) varies a little and the defect density varies little. According to the results, the method of combining an LT-Si layer with ion implantation can prepare high-quality strained-Si material with a high relaxation degree and ultra-thin SiGe virtual substrate to meet the requirements of device applications.     

基于文献计量的石油钻井油泥处理及资源化利用分析

目的全面了解国内外石油钻井油泥处理现状和应用动态。 方法基于中国知网(CNKI)和Web of Science(WOS)数据库,检索2007-2021年15年间国内外钻井油泥的相关研究文献,采用文献计量法从多角度进行分析。 结果在2007-2021年,该领域中、英文发文量均呈上升趋势,其中中文发文量高于英文;国内外基金资助项目最多的均是中国国家自然基金,机构影响力较高的分别为中国石油大学(华东)和法赫德国王石油矿产大学;中国在该领域的活跃程度高,而美国的研究水平处国际领先地位;国内研究重视钻井技术和油泥处理,国际研究关注钻井材料和污染水处理,国内外均对油泥资源化利用探究较少。 结论油泥资源化利用已成为当前研究热点,油泥无害化和资源化用于绿化种植用土是一项重要研究发展方向。      

影响光纤宽带网络建设投资和综合造价的因素分析

影响光纤宽带网络工程建设投资和综合造价的因素众多,不可能把全国或全省的工程造价控制在同一个水平上。目前,新建区域基本以光纤到户（FTTH）接入方式为主,现有区域的改造主要以FTTH和光纤到楼（FTTB）接入方式为主,并辅以其他接入方式。接入方式不同则造价不同,即便是同一接入方式,不同场景下的各地综合造价也有较大差别,从而直接影响到了建设投资。以FTTH为例,从建设场景、建设方式、覆盖方式、分光方式、覆盖深度、建设标准、地区性差异、操作方式、设备集采等方面,全面分析了影响光纤宽带网络建设的投资和综合造价因素。     

The Effect of Adding Corrosion Inhibitors into an Electroless Nickel Plating Bath for Magnesium Alloys

Journal of Materials Engineering and Performance - In this work, corrosion inhibitors were added into an electroless nickel plating bath to realize nickel-phosphorus (Ni-P) coating deposition on...     

DIMENSION REDUCTION OF HYPERSPECTRAL REMOTE SENSING IMAGERY BASED ON SUPERVISED ISOMETRIC MAPPING

在面向分类的高光谱遥感数据降维过程中,考虑到高光谱遥感数据内在的非线性结构和传统流形学习非监督的特点,提出一种新的监督等距映射方法(S-Isomap).方法基于类间距离大于类内距离的思想,首先利用KMEANS算法对原始数据进行聚类得到样本的初始类别标签,采用新距离搜寻数据点的K近邻,进而实施等距映射降维.实验证明了该方法优于传统Isomap.     

Separate enrichment analysis of pathways for up- and downregulated genes

Two strategies are often adopted for enrichment analysis of pathways: the analysis of all differentially expressed (DE) genes together or the analysis of up- and downregulated genes separately. However, few studies have examined the rationales of these enrichment analysis strategies. Using both microarray and RNA-seq data, we show that gene pairs with functional links in pathways tended to have positively correlated expression levels, which could result in an imbalance between the up- and downregulated genes in particular pathways. We then show that the imbalance could greatly reduce the statistical power for finding disease-associated pathways through the analysis of all-DE genes. Further, using gene expression profiles from five types of tumours, we illustrate that the separate analysis of up- and downregulated genes could identify more pathways that are really pertinent to phenotypic difference. In conclusion, analysing up- and downregulated genes separately is more powerful than analysing all of the DE genes together.     

铁路扣件图像边缘检测中LoG参数优化

边缘特征是铁路扣件缺陷分类的重要依据。高斯拉普拉斯（LoG）算子提取的边缘特征最接近扣件的真实边缘,但LoG参数的选取直接影响边缘检测效果。针对LoG参数的优化,采用基于布谷鸟搜索优化高斯拉普拉斯边缘检测的算法。利用布谷鸟优化搜索对阈值邻近像素值和标准偏差参数进行优化来提高拉普拉斯边缘检测性能。利用Pratt品质因数IMP值判定检测到的边缘是否最佳。实验证明,该方法有效优化了LoG参数的设置,得到的边缘特征提高了扣件缺陷分类准确率。