期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到1,453篇文章
< 1 2 … 73 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Calorific values and ash contents of different parts of Masson pine trees in southern China 认领 引用 被引量：4
1
作者 Wei-sheng ZENG Shou-zheng TANG Qian-hui XIAO 《Journal of Forestry Research》 SCIE CAS CSCD 2014年第4期779-786,共8页
Calorific value of plants is an important parameter for evalu- ating and indexing material cycles and energy conversion in forest eco- systems. Based on mensuration data of 150 sample sets, we analyzed the calorific v... Calorific value of plants is an important parameter for evalu- ating and indexing material cycles and energy conversion in forest eco- systems. Based on mensuration data of 150 sample sets, we analyzed the calorific value （CV） and ash content （AC） of different parts of Masson pine （Pinus massoniana） trees in southern China using hypothesis testing and regression analysis. CV and AC of different tree parts were almost significantly different （P〈0.05）. In descending order, ash-free calorific value （AFCV） ranked as foliage 〉 branch 〉 stem bark 〉 root 〉 stem wood, and AC ranked as foliage 〉 stem bark 〉 root 〉 branch 〉 stem wood. CV and AC of stem wood from the top, middle and lower sections of trees differed significantly. CV increased from the top to the lower sections of the tnmk while AC decreased. Mean gross calorific value （GCV） and AFCV of aboveground parts were significantly higher than those of belowground parts （roots）. The mean GCV, AFCV and AC of a whole tree of Masson pine were 21.54 kJ/g, 21.74 kJ/g and 0.90%, re- spectively. CV and AC of different tree parts were, to some extent, cor- related with tree diameter, height and origin. 展开更多
关键词 ash-free calorific value ash content gross calorific value hypothesis testing regression analysis Pinus massoniana
暂未订购 下载PDF
Prediction of ash content of unloaded coal based on a discrete element simulation 认领 引用
2
作者 Deng Jianjun Zhuo Jinwu Shi Hongxia 《International Journal of Mining Science and Technology》 EI CAS 2013年第5期647-651,共5页
Based on analysis of regularity of stacking coal,discrete element simultaneous simulation is adopted to predict the process of unloading coal,which is proved to be effcient in the prediction of ash content.The results... Based on analysis of regularity of stacking coal,discrete element simultaneous simulation is adopted to predict the process of unloading coal,which is proved to be effcient in the prediction of ash content.The results show that the altitude of new irregular coal is equal to the income coal volume divided by area of cabin.The distribution of infnitesimal flow velocity helps to induce the motion equation of infnitesimal element,which provides the mathematical model for computer simulation.Swarm,a computer programming language,is utilized in this study.Adaptive infnitesimal stacking algorithm helps settle the diffculties in attainment of infnitesimal elements.The result of simulation is similar to the actual situation,which can accurately predict the ash contents of current time and cumulative time.Coal movement in the cabin is a new project,the result of which can also be applied to other solid particles and the widespread of the result will be highly valued. 展开更多
关键词 Discrete element Simulation Ash content forecast Coal blending Motion equation Mathematical model
暂未订购 下载PDF
Incorporating empirical knowledge into data-driven variable selection for quantitative analysis of coal ash content by laser-induced breakdown spectroscopy 认领 引用 被引量：2
3
作者 吕一涵 宋惟然 +1 位作者 侯宗余 王哲 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第7期148-156,共9页
Laser-induced breakdown spectroscopy(LIBS)has become a widely used atomic spectroscopic technique for rapid coal analysis.However,the vast amount of spectral information in LIBS contains signal uncertainty,which can a... Laser-induced breakdown spectroscopy(LIBS)has become a widely used atomic spectroscopic technique for rapid coal analysis.However,the vast amount of spectral information in LIBS contains signal uncertainty,which can affect its quantification performance.In this work,we propose a hybrid variable selection method to improve the performance of LIBS quantification.Important variables are first identified using Pearson's correlation coefficient,mutual information,least absolute shrinkage and selection operator(LASSO)and random forest,and then filtered and combined with empirical variables related to fingerprint elements of coal ash content.Subsequently,these variables are fed into a partial least squares regression(PLSR).Additionally,in some models,certain variables unrelated to ash content are removed manually to study the impact of variable deselection on model performance.The proposed hybrid strategy was tested on three LIBS datasets for quantitative analysis of coal ash content and compared with the corresponding data-driven baseline method.It is significantly better than the variable selection only method based on empirical knowledge and in most cases outperforms the baseline method.The results showed that on all three datasets the hybrid strategy for variable selection combining empirical knowledge and data-driven algorithms achieved the lowest root mean square error of prediction(RMSEP)values of 1.605,3.478 and 1.647,respectively,which were significantly lower than those obtained from multiple linear regression using only 12 empirical variables,which are 1.959,3.718 and 2.181,respectively.The LASSO-PLSR model with empirical support and 20 selected variables exhibited a significantly improved performance after variable deselection,with RMSEP values dropping from 1.635,3.962 and 1.647 to 1.483,3.086 and 1.567,respectively.Such results demonstrate that using empirical knowledge as a support for datadriven variable selection can be a viable approach to improve the accuracy and reliability of LIBS quantification. 展开更多
关键词 laser-induced breakdown spectroscopy(LIBS) coal ash content quantitative analysis variable selection empirical knowledge partial least squares regression(PLSR)
暂未订购 下载PDF
Preparation of activated carbon with low ash content and high specific surface area from coal in the presence of KOH 认领 引用 被引量：4
4
作者 解强 陈清如 +2 位作者 宫国卓 张香兰 许德平 《Journal of Coal Science & Engineering(China)》 2003年第2期84-89,共6页
An activated carbon with ash content less than 10% and specific surface area more than 1 600 m 2 /g was prepared from coal and the effect of K containing compounds in preparation of coal based activated carbon was inv... An activated carbon with ash content less than 10% and specific surface area more than 1 600 m 2 /g was prepared from coal and the effect of K containing compounds in preparation of coal based activated carbon was investigated in detail in this paper. KOH was used in co carbonization with coal, changes in graphitic crystallites in chars derived from carbonization of coal with and without KOH were analyzed by X ray diffraction (XRD) technique, activation rates of chars with different contents of K containing compounds were deduced, and resulting activated carbons were characterized by nitrogen adsorption isotherms at 77 K and iodine numbers. The results showed that the addition of KOH to the coal before carbonization can realize the intensive removal of inorganic matters from chars under mild conditions, especially the efficient removal of dispersive quartz, an extremely difficult separated mineral component in other processes else. Apart from this, KOH demonstrates a favorable effect in control over coal carbonization with the goal to form nongraphitizable isotropic carbon precursor, which is a necessary prerequisite for the formation and development of micro pores. However, the K containing compounds such as K 2 CO 3 and K 2 O remaining in chars after carbonization catalyze the reaction between carbon and steam in activation, which leads to the formation of macro pores. In the end an innovative method, in which KOH is added to coal before carbonization and K containing compounds are removed by acid washing after carbonization, was proposed for the synthesis of quality coal based activated carbon. 展开更多
关键词 coal based activated carbon KOH ash content specific surface area
暂未订购 下载PDF
Determination of Ash Contents in Coal by Means of Ordinary Kriging Method 认领 引用
5
作者 Tomasz Niedoba Tadeusz Tumidajski 《Journal of Earth Science and Engineering》 2012年第10期571-575,共5页
The ash contents in coal particles were examined in the paper dependably on particle size and its density. So, the two-dimensional regressive function Z = Z（P, D） was the searched object, where Z is random variable ... The ash contents in coal particles were examined in the paper dependably on particle size and its density. So, the two-dimensional regressive function Z = Z（P, D） was the searched object, where Z is random variable describing ash contents, P---density and D---particle diameter. This dependence was determined based on experimental data concerning the coal of type 31. For this coal, the method of ordinary kriging was applied to calculate the values of random variable Z. This method required the proper selection of so-called variogram function, in which four forms were considered in this paper in purpose to select the best solution. The given results were then evaluated by the mean standard error value and compared with empirical data. 展开更多
关键词 Ordinary kriging coal ash contents geostatistics.
暂未订购 下载PDF
Deashing of Agricultural Residues and Its Impact on Isolated Lignin Properties:A Mini Review 认领 引用
6
作者 Eko Budi Santoso Nur Izyan Wan Azelee +2 位作者 Deded Sarip Nawawi Wasrin Syafii Widya Fatriasari 《Journal of Renewable Materials》 EI CAS 2025年第5期865-884,共20页
The significant amount of ash content in agricultural biomass presents an enormous challenge for efficient conversion processes.In addressing this issue,various deashing treatments have been tested and established,inc... The significant amount of ash content in agricultural biomass presents an enormous challenge for efficient conversion processes.In addressing this issue,various deashing treatments have been tested and established,including simple leaching techniques,which can either be performed with or without the addition of chemical agents.These techniques hold promise for improving the deashing efficiency while potentially altering the structural and chemical composition of biomass,specifically lignin content,which is the key focus of this review.This review starts by exploring the presence of ash in agricultural residues and its impact on biomass properties.Next,this review examines deashing strategies aimed at reducing ash levels in biomass followed by analysis of the resulting changes in lignin physical and chemical properties as well as its thermal characteristics.The final part of this review is concluded by the discussion on the limitations of current approaches and the possible future directions to address the challenges covering the environmental impacts of the deashing treatments.A green process approach is emphasized as a sustainable solution with the aim to minimize negative environmental impacts associated with chemical usage during deashing.Finally,this review highlights the potential for ash recovery as a byproduct of the deashing processes,paving the way for an integrative,closed-loop approach within the biorefinery concept. 展开更多
关键词 Leaching treatment high ash content agricultural residue chemical makeup lignin characteristics biorefinery
暂未订购 下载PDF
Quality Evaluation of Leontopodium franchetii Beauv. from Different Localities Based on Moisture,Ash and Extract Contents and Thin-layer Chromatography 认领 引用
7
作者 Pei QUN Yatao HAN +3 位作者 Fang XIAO Zhe LIU Yongxia KE Yuan LIU 《Medicinal Plant》 2018年第4期56-58,共3页
[Objectives] The aim was to determine the moisture,ash and extract contents in Leontopodium franchetii Beauv. from different localities. [Methods] The contents of moisture,total ash,acid-insoluble ash and extract in L... [Objectives] The aim was to determine the moisture,ash and extract contents in Leontopodium franchetii Beauv. from different localities. [Methods] The contents of moisture,total ash,acid-insoluble ash and extract in L. franchetii from different localities were determined according to the methods described in Chinese Pharmacopoeia( 2015 Edition). [Results] In the 10 samples,the contents of moisture were all less than or equal to 15. 0%; the contents of total ash were all below 12. 0%; and the contents of acid-insoluble ash were all less than 3. 0%. The contents of water-soluble extract( by cold-soaked extraction method) in the samples were all below 12. 0% except those from Hongyuan Prairie of Sichuan Province and Xinglong Mountain in Lanzhou City,Gansu Province. [Conclusions]The contents of the four indicators measured in this experiment varied by small margins,indicating that the quality was relatively stable. This study provides theoretical data for the revision of the quality standards for L. franchetii. 展开更多
关键词 Leontopodium franchetii Beauv. Moisture Ash Extract Content Thin-layer chromatography Quality evaluation
暂未订购 下载PDF
基于结晶特性调控的国产BOPP薄膜击穿性能提升研究 认领 引用
8
作者 潘绍明 陈梁远 +4 位作者 张炜 苏毅 张磊 马源 黄炜 《广东电力》 北大核心 2026年第6期122-130,共9页
双向拉伸聚丙烯(biaxially oriented polypropylene,BOPP)薄膜具有高介电强度、低介电损耗等特性,是薄膜电容器的主要工作介质;但多数国产聚丙烯灰分含量高且介电强度不足,导致电容器用聚丙烯树脂高度依赖进口。为此,以较高灰分国产聚... 双向拉伸聚丙烯(biaxially oriented polypropylene,BOPP)薄膜具有高介电强度、低介电损耗等特性,是薄膜电容器的主要工作介质;但多数国产聚丙烯灰分含量高且介电强度不足,导致电容器用聚丙烯树脂高度依赖进口。为此,以较高灰分国产聚丙烯树脂为研究对象,采用成核剂对国产聚丙烯树脂进行改性,并将其与低灰分进口BOPP薄膜进行多维度性能对比,结合结晶特性,阐明成核剂提升BOPP薄膜击穿电场强度的微观机理,提出提高高灰分国产BOPP薄膜击穿性能的技术路线。结果表明:结晶度和晶粒尺寸是影响BOPP薄膜电、热、力学等多维度性能的关键结构因素;与国产BOPP薄膜相比,进口BOPP薄膜结晶度较高(44.05%),晶粒尺寸较小(22.01 nm),击穿、拉伸和加工性能更优异,其中击穿电场强度在室温下达583.2 kV/mm,100℃下降低9.8%;国产聚丙烯经成核剂改性后,BOPP薄膜结晶度从40.19%提高至42.87%,晶粒尺寸从24.89 nm降低至21.21 nm,室温下击穿电场强度显著提高,达到576.8 kV/mm,且100℃下仅降低8.0%,性能与进口BOPP薄膜媲美。 展开更多
关键词 双向拉伸聚丙烯 灰分 结晶度 晶粒尺寸 击穿电场强度
暂未订购 下载PDF
等厚度煤层灰分的低能γ射线在线检测理论与方法研究 认领 引用
9
作者 吕文豹 朱启辉 +2 位作者 王传真 陈伟 刘海增 《矿产保护与利用》 CAS CSCD 2026年第2期64-72,共9页
针对质量厚度波动导致双能量γ射线在线灰分仪检测数据波动性大、测量误差显著等问题,提出一种基于低能γ射线的等厚度煤层灰分测量装置及方法。该装置通过固定煤层与探测器表面的最佳距离,恒定被测煤样的煤层厚度,同时实现被测煤样的... 针对质量厚度波动导致双能量γ射线在线灰分仪检测数据波动性大、测量误差显著等问题,提出一种基于低能γ射线的等厚度煤层灰分测量装置及方法。该装置通过固定煤层与探测器表面的最佳距离,恒定被测煤样的煤层厚度,同时实现被测煤样的粒度细化与粒径分布窄化,确保煤流表面平整性、密实度稳定性及水分一致性,为低能γ射线灰分检测构建了最优测量环境。以入洗孙疃-童亭及许疃-临肥重介精煤为研究对象,同步采样化验结果表明:两组煤样的化验灰分标准差分别为0.442和0.353,对应测量灰分标准差显著降低至0.337和0.206;以测量值与化验值的绝对误差均值作为评价指标,两组煤样的平均误差分别为0.32%和0.31%,均控制在0.50%的允许误差范围内。经参数标定与实验验证,该低能γ射线等厚度煤层测量方法展现出较高的灰分检测稳定性与准确性。 展开更多
关键词 灰分 质量厚度 低能r射线 等厚度煤层 灰分仪
暂未订购 下载PDF
海水海砂再生混凝土强度影响因素试验研究 认领 引用
10
作者 王倩 邵勇 +1 位作者 徐海群 崔恩文 《连云港职业技术学院学报》 2026年第1期1-7,共7页
对海水海砂再生混凝土及淡水河砂再生混凝土进行7 d~365 d龄期的立方体抗压强度试验,研究粉煤灰掺量、养护龄期、再生粗骨料的压碎指标等因素对海水海砂再生混凝土强度的影响。试验结果表明,再生粗骨料的压碎指标为20.7%时,粉煤灰掺量为... 对海水海砂再生混凝土及淡水河砂再生混凝土进行7 d~365 d龄期的立方体抗压强度试验,研究粉煤灰掺量、养护龄期、再生粗骨料的压碎指标等因素对海水海砂再生混凝土强度的影响。试验结果表明,再生粗骨料的压碎指标为20.7%时,粉煤灰掺量为20%、30%与40%的C30、C40级淡水河砂再生混凝土及海水海砂再生混凝土在28 d~365 d龄期时的抗压强度均随粉煤灰掺量的增大而增大;粉煤灰掺量为0%~40%时,SC30再生混凝土在7 d~365 d龄期的强度均高于同掺量的NC30再生混凝土;粉煤灰掺量为20%~40%时,NC40再生混凝土在7 d~365 d龄期的强度均高于同粉煤灰掺量的SC40再生混凝土。再生粗骨料的压碎指标值对海水海砂再生混凝土的强度具有较大影响,配制C30、C40强度等级的海水海砂再生混凝土应采用压碎指标达到Ⅱ类要求的再生粗骨料,配制C20强度等级的再生混凝土可采用压碎指标达到Ⅲ类要求的再生粗骨料。 展开更多
关键词 海水海砂再生混凝土 强度 粉煤灰掺量 压碎指标
暂未订购 下载PDF
基于正交试验的高掺量粉煤灰PP-ECC力学性能分析 认领 引用
11
作者 贾毅 李唐伟 +2 位作者 李琪 赵强 沈先桃 《混凝土》 CAS 北大核心 2026年第5期98-102,108,共5页
为探究高掺量粉煤灰聚丙烯纤维混凝土(PP-ECC)的最佳配合比及其基本力学性能,采用正交试验方法研究了水胶比、聚丙烯纤维(PP)掺量以及粉煤灰掺量对混凝土力学性能的影响。试验结果显示,PP-ECC混凝土的立方体抗压强度稳定在30 MPa以上,... 为探究高掺量粉煤灰聚丙烯纤维混凝土(PP-ECC)的最佳配合比及其基本力学性能,采用正交试验方法研究了水胶比、聚丙烯纤维(PP)掺量以及粉煤灰掺量对混凝土力学性能的影响。试验结果显示,PP-ECC混凝土的立方体抗压强度稳定在30 MPa以上,峰值抗拉强度超过2 MPa,极限拉伸应变超过3%。聚丙烯纤维的加入显著提高了混凝土的抗拉强度,并且试件破坏时呈现多裂缝特征。正交试验分析表明,粉煤灰掺量对混凝土抗压强度的影响最大,而纤维掺量对抗拉强度的影响最为显著。为了获得较优的立方体抗压强度和轴心抗拉强度,推荐的最佳配合比为水胶比0.25,纤维掺量3%,粉煤灰掺量40%。同时,通过电镜微观试验观察到,纤维与混凝土基体之间具有良好的黏结性能,进一步验证了聚丙烯纤维能显著提升混凝土的韧性和抗裂性。 展开更多
关键词 高掺量粉煤灰 聚丙烯纤维 混凝土 力学性能 正交试验 配合比
暂未订购 下载PDF
BOND PERFORMANCE EXPERIMENT FOR FLY ASH CONCRETE AND STEEL BAR 认领 引用
12
作者 王倩 吴瑾 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2012年第3期302-306,共5页
The impact of fly ash content on bond performance of steel bars and their surrounding concrete is studied by means of sticking strain gauges on steel bars. The average bond stress-slip curves, the steel strain-anchor ... The impact of fly ash content on bond performance of steel bars and their surrounding concrete is studied by means of sticking strain gauges on steel bars. The average bond stress-slip curves, the steel strain-anchor location curves, and the bond stress-anchor position curves of the pullout specimens with various fly ash contents are obtained. Results indicate that the bond performance of concrete and steel bars can be improved and the distribution of steel strain along the anchorage length tends to be more uniform by adding fly ash in concrete specimens, and both ultimate bond stress and ultimate slip deformation increase the most when 20% of specimens′ content is fly ash. 展开更多
关键词 fly ash concrete bond performance fly ash content bond stress distribution
暂未订购 下载PDF
基于双能X射线对中低灰煤灰分识别研究与预测 认领 引用 被引量：2
13
作者 张翔宇 樊玉萍 +2 位作者 马晓敏 董宪姝 赵海涛 《太原理工大学学报》 CAS 北大核心 2026年第3期563-573,共11页
【目的】针对中低灰煤灰分的实时监测过程中存在检测精度低、检测周期长、辐射风险大的问题,提出了一种基于双能X射线测量和人工智能算法相结合的检测模型和测量方法,即基于MLP神经网络的煤炭灰分检测模型。【方法】基于双能X射线设计... 【目的】针对中低灰煤灰分的实时监测过程中存在检测精度低、检测周期长、辐射风险大的问题,提出了一种基于双能X射线测量和人工智能算法相结合的检测模型和测量方法,即基于MLP神经网络的煤炭灰分检测模型。【方法】基于双能X射线设计了中低灰煤灰分检测实验系统,以粒度、X射线入射角、水分和组成成分作为变量,研究了不同因素对中低灰煤灰分识别效果的影响。建立了X射线透射灰度值与样品灰分含量之间的精准映射关系,采用双能X射线数据对神经网络进行训练,保证模型预测的准确性和可靠性。【结果】结果表明,最后训练后的模型预测值与真实值的均方根误差为0.0817,平均绝对误差为0.00001。灰分35%时,预测范围偏差较大。 展开更多
关键词 灰分 双能X射线 MLP神经网络 蝗虫算法
暂未订购 下载PDF
聚丙烯细纤维对粉煤灰胶砂力学性能影响试验研究 认领 引用
14
作者 普如敏 仕明刚 +2 位作者 王志清 钟家萍 周正双 《聚酯工业》 CAS 2026年第1期46-48,共3页
本文通过试验探究不同聚丙烯细纤维掺量对粉煤灰胶砂力学性能的影响。结果表明,粉煤灰胶砂力学性能随纤维掺量的增加呈先上升后下降的变化趋势。适量聚丙烯细纤维的掺入可显著增强粉煤灰胶砂的抗折与抗压强度。当掺量超过临界值后,纤维... 本文通过试验探究不同聚丙烯细纤维掺量对粉煤灰胶砂力学性能的影响。结果表明,粉煤灰胶砂力学性能随纤维掺量的增加呈先上升后下降的变化趋势。适量聚丙烯细纤维的掺入可显著增强粉煤灰胶砂的抗折与抗压强度。当掺量超过临界值后,纤维易发生团聚,破坏基体的致密性和均匀性,进而导致整体强度下降。此外,相较于抗压性能,试件抗折性能的提升幅度对纤维掺量的变化更加敏感。 展开更多
关键词 粉煤灰胶砂 聚丙烯细纤维 纤维掺量 力学性质 增强机理
暂未订购 下载PDF
基于国产洗涤聚丙烯树脂的BOPP薄膜性能测试及电-热联合老化特性研究 认领 引用
15
作者 苏尧天 杨博 +4 位作者 张翀 郭少玮 刘炬阳 王博 邢照亮 《绝缘材料》 CAS 北大核心 2026年第7期86-93,共8页
为解决特高压柔性直流输电系统中干式直流电容器用双向拉伸聚丙烯(BOPP)薄膜依赖进口、国产聚丙烯树脂灰分含量偏高导致薄膜绝缘及耐老化性能不足的关键问题,本文选取进口电工级、国产连续洗涤低灰分、国产未洗涤高灰分聚丙烯树脂制备B... 为解决特高压柔性直流输电系统中干式直流电容器用双向拉伸聚丙烯(BOPP)薄膜依赖进口、国产聚丙烯树脂灰分含量偏高导致薄膜绝缘及耐老化性能不足的关键问题,本文选取进口电工级、国产连续洗涤低灰分、国产未洗涤高灰分聚丙烯树脂制备BOPP薄膜,系统表征了薄膜微观形貌、结晶结构与电学特性,并开展了交-直流叠加电-热联合老化试验。结果表明:低灰分国产洗涤聚丙烯树脂制备的BOPP薄膜具有更高的电气强度和更稳定的高温介电性能,且老化后薄膜晶区结构无显著变化,电学性能接近进口BOPP薄膜水平。 展开更多
关键词 直流电容器 聚丙烯 连续洗涤 灰分 老化实验
暂未订购 下载PDF
基于MARNet与特征工程融合的浮选精煤灰分预测方法 认领 引用
16
作者 郭立旺 钮键 +3 位作者 郝润芳 郭敏 景超 程永强 《太原理工大学学报》 CAS 北大核心 2026年第3期530-540,共11页
【目的】基于浮选泡沫图像预测精煤灰分是浮选智能化控制的核心方法之一。针对现有图像特征表征维度不全面、多源信息融合不足导致的预测精度受限问题,提出了一种融合多通道注意力回归网络(MARNet)与特征工程的浮选精煤灰分预测方法。... 【目的】基于浮选泡沫图像预测精煤灰分是浮选智能化控制的核心方法之一。针对现有图像特征表征维度不全面、多源信息融合不足导致的预测精度受限问题,提出了一种融合多通道注意力回归网络(MARNet)与特征工程的浮选精煤灰分预测方法。【方法】首先构建多种颜色空间图像输入的MARNet,利用注意力机制从不同颜色空间图像中关注不同的泡沫信息,同时基于极限梯度提升(XGBoost)算法,从形态、颜色、纹理及频域四个方面构建特征工程灰分预测模型,建立贝叶斯动态加权融合策略,基于后验概率优化准则自适应分配MARNet与XGBoost的预测权重,形成优势互补的协同预测机制。【结果】实验结果表明:MARNet与特征工程融合模型的预测性能显著优于传统方法,其决定系数(R2)为0.9691,平均绝对误差为0.1264%,均方根误差(RMSE)为0.2161%,相比于单一模型预测的RMSE分别降低了70.90%和25.22%,显著提升了预测精度,验证了这种方法在浮选过程智能控制中的有效性。 展开更多
关键词 浮选精煤 灰分预测 特征提取 多通道注意力回归网络 XGBoost 贝叶斯平均
暂未订购 下载PDF
基于内在成因分析地骨皮总灰分限度标准研究 认领 引用
17
作者 尚杰 王丹丹 +1 位作者 丁越 李婷 《上海中医药大学学报》 CAS CSCD 2026年第3期55-60,共6页
目的:探究地骨皮总灰分超标的内在成因,为其限度标准的修订提供科学依据。方法:参照《中华人民共和国药典(2025年版)》第四部通则2302灰分测定法对15批市售地骨皮样品进行总灰分、酸不溶性灰分检查;分别建立地骨皮中CaC2O4、地骨... 目的:探究地骨皮总灰分超标的内在成因,为其限度标准的修订提供科学依据。方法:参照《中华人民共和国药典(2025年版)》第四部通则2302灰分测定法对15批市售地骨皮样品进行总灰分、酸不溶性灰分检查;分别建立地骨皮中CaC2O4、地骨皮乙素的高效液相色谱(HPLC)方法,对样品中CaC2O4、地骨皮乙素含量进行测定;采用乙二胺四乙酸(EDTA)滴定法测定总灰分中CaCO3含量,并通过SPSS 27.0软件对地骨皮中总灰分、CaC2O4、地骨皮乙素、CaCO3含量进行两两间相关性分析。结果:地骨皮中总灰分为11.16%~19.45%,酸不溶性灰分为0.20%~2.26%,CaC2O4含量为9.51%~20.35%,CaCO3含量为7.57%~15.97%,地骨皮乙素含量为0.29%~4.17%,相关性分析结果显示总灰分与CaC2O4含量、CaCO3含量呈极显著的正相关性(P0.05)。结论:地骨皮中CaC2O4经灰化生成CaCO3是总灰分超标的主因,总灰分限度标准与药材的内在质量关联性不强,建议修订为总灰分不得超过18.0%,或将质量控制重点转向酸不溶性灰分。 展开更多
关键词 地骨皮 灰分 CaC2O4 质量标准
暂未订购 下载PDF
融合XRF光谱信息与RF-RSCN的浮选精煤灰分智能检测方法 认领 引用
18
作者 于锋 李丽娟 +2 位作者 朱志鸿 南静 宛鹤 《矿产保护与利用》 CAS CSCD 2026年第3期116-125,共10页
针对浮选精煤灰分检测速度慢、难以满足生产过程快速调控需求的问题,提出了一种融合X射线荧光光谱(XRF)信息与残差驱动特征加权正则化随机配置网络(RF-RSCN)的智能检测方法。首先,针对在线XRF光谱数据维度高、共线性强及噪声干扰明显的... 针对浮选精煤灰分检测速度慢、难以满足生产过程快速调控需求的问题,提出了一种融合X射线荧光光谱(XRF)信息与残差驱动特征加权正则化随机配置网络(RF-RSCN)的智能检测方法。首先,针对在线XRF光谱数据维度高、共线性强及噪声干扰明显的特点,采用偏最小二乘法(PLS)进行监督降维,提取与灰分值密切相关的潜在特征;在此基础上,引入特征加权机制、残差驱动节点配置策略及动态正则化方法,以增强模型对复杂非线性关系的表征能力和泛化性能。基于选煤厂浮选精煤在线采集的924组样本开展验证,结果表明:在时间顺序划分条件下,RF-RSCN模型测试集的均方根误差(RMSE)、平均绝对误差(MAE)和决定系数(R2)分别为0.0134、0.0102和0.9965,整体预测效果优于随机配置网络(SCN)、块增量随机配置网络(BSCN)、增量随机向量函数链神经网络(IRVFLN)、支持向量回归(SVR)、混合深度神经网络(HDNN)、偏最小二乘回归(PLSR)和BP等对比模型;单样本测试时间为3.5×10-5 s,具有较高的计算效率。这些均表明该方法能够较有效地建立XRF光谱与精煤灰分信号之间的映射关系,可为浮选精煤灰分快速检测及过程优化提供技术支撑。 展开更多
关键词 随机配置网络 残差驱动 特征感知 动态正则化 精煤灰分检测
暂未订购 下载PDF
不同基体低密度炭/炭保温材料快速制备及性能研究 认领 引用
19
作者 刘艳 王晶晶 +5 位作者 武珂欣 刘维鹏 官旭 白小宝 李承嗣 李国丹 《纤维复合材料》 CAS 2026年第3期38-42,共5页
以酚醛树脂为浸渍剂,黏胶基炭毡、PAN基炭毡为增强体,采用模压工艺制备两种低密度隔热炭/炭复合材料。对比研究两种材料的压缩性能与导热系数,并通过扫描电子显微镜(SEM)观察其断口微观形貌。结果表明:以黏胶基炭毡为增强体制备的低密... 以酚醛树脂为浸渍剂,黏胶基炭毡、PAN基炭毡为增强体,采用模压工艺制备两种低密度隔热炭/炭复合材料。对比研究两种材料的压缩性能与导热系数,并通过扫描电子显微镜(SEM)观察其断口微观形貌。结果表明:以黏胶基炭毡为增强体制备的低密度隔热炭/炭复合材料压缩强度较高,约为0.74 MPa;两种材料的应力-位移曲线与断口微观形貌均表明,其压缩破坏方式为伪塑性断裂。在1600℃条件下,黏胶基、PAN基炭毡增强的低密度隔热炭/炭复合材料导热系数分别约为0.308 W/(m·K)、0.369 W/(m·K),灰分含量分别为189 ppm、193 ppm。由此可见,黏胶基炭毡增强的低密度隔热炭/炭复合材料具有更优异的隔热性能与高温结构稳定性。该制备工艺生产稳定性良好,生产效率提升约20%,具有广阔的工业化应用前景。 展开更多
关键词 低密度炭/炭保温材料 模压成型 导热系数 灰分
暂未订购 下载PDF
煤气化渣碳灰分离技术及综合利用研究现状 认领 引用
20
作者 邓军 贺国章 +4 位作者 沈澍昊 张萍萍 胡忠波 王海楠 李晓恒 《煤化工》 CAS 2026年第3期116-120,共5页
碳灰分离是将煤气化渣中的残碳与灰分进行分离的过程,实现碳灰有效分离是煤气化渣进行减量化、高值化和无害化处置的前提。分析了煤气化渣的形成过程及特性,综述了粒度分选、重力分选、浮选、电选等煤气化渣碳灰分离技术的研究现状,讨... 碳灰分离是将煤气化渣中的残碳与灰分进行分离的过程,实现碳灰有效分离是煤气化渣进行减量化、高值化和无害化处置的前提。分析了煤气化渣的形成过程及特性,综述了粒度分选、重力分选、浮选、电选等煤气化渣碳灰分离技术的研究现状,讨论了煤气化渣在建筑路基、土壤及农业、掺烧、高附加值利用等方面的研究和应用进展,并对煤气化渣的分选及综合利用提出了相关建议。 展开更多
关键词 煤气化渣 粗渣 细渣 碳灰分离 残碳 灰分 综合利用
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 73 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈