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低阶煤热解挥发分热催化重整研究进展

化工进展 2024年第5期43卷 2279-2293页

作者：姚乃瑜曹景沛庞新博赵小燕蔡士杰徐敏赵静平冯晓博伊凤娇中国矿业大学江苏省碳资源精细化利用工程研究中心江苏徐州221116

低阶煤清洁高效利用是我国的重大战略需求之一。在煤热转化技术中,煤热解挥发分催化重整可将复杂热解产品定向轻质化制备化学品,具有广泛应用前景。改变工艺条件是提高热解转化率和产品收率的重要手段,优化反应器设计以及开发高活性和... 详细信息

低阶煤清洁高效利用是我国的重大战略需求之一。在煤热转化技术中,煤热解挥发分催化重整可将复杂热解产品定向轻质化制备化学品,具有广泛应用前景。改变工艺条件是提高热解转化率和产品收率的重要手段,优化反应器设计以及开发高活性和稳定性催化剂是该技术发展的重要方向。本文首先介绍了低阶煤及其挥发分的催化重整方式,在此基础上综述了温度、气氛、停留时间等反应条件的影响以及固定床和流化床反应器应用的策略和挑战,然后对金属类、炭基和沸石类催化剂的后处理及原位控制等改性方法与作用原理进行了分析,阐述了热解挥发分的催化裂解机理。此外,指出了煤热解挥发分催化重整技术在工业化生产中的瓶颈,明确了挥发分中低碳烃类与大分子化合物的催化转化路径对煤热解过程中二次反应定向调控的关键作用,深入探究了催化剂中酸催化质子化作用对催化剂失活机制的影响。

关键词：低阶煤热催化重整挥发分反应条件反应器

Intraspecific leaf morphological variation in Quercus dentata Thunb.:a comparison of traditional and geometric morphometric methods,a pilot study

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Journal of Forestry Research 2022年第6期33卷 1751-1764页

作者： Kaiyu Yang Jianghao Wu Xinman Li xinbo pang Yangchen Yuan Guohui Qi Minsheng Yang College of Forestry Hebei Agricultural UniversityBaoding 071000HebeiPeople’s Republic of China Hebei Key Laboratory for Tree Genetic Resources and Forest Protection Baoding 071000HebeiPeople’s Republic of China Administration Bureau of Hongyashan State Owned Forest Farm in Yixian County Yixian 074200HebeiPeople’s Republic of China Research Center for Walnut Engineering and Technology of Hebei Lincheng 054300HebeiPeople’s Republic of China Institute of Walnut Industry Technology of Hebei Province(Xingtai) Lincheng 054300HebeiPeople’s Republic of China

To compare the application of traditional morphometric methods(TMMs)and geometric morphometric methods(GMMs)in the study of intraspecific leaf morphological characters of Quercus dentata,fifteen linear measurement indices and thirteen landmarks of leaves were used to study leaf morphology of three provenances(H1,H2,and H3).In TMMs,principal component analysis(PCA)showed that leaf size–related indices played an important role in population *** least square(PLS)analysis showed that the main morphological characters affecting leaf size were the average depth of the lobes and the length–width ***,the important indices to distinguish the provenances were circularity,leaf width,and length–width *** results of discriminant analysis(DA)showed that 74.0%of H1,68.0%of H2,and 74.0%of H3 were correctly *** analysis showed that the Mahalanobis distances between H1 and H2,H1 and H3,and H2 and H3 were 4.3761,11.4629,and 10.2067,*** GMMs,PCA based on symmetrical components showed that the difference in leaf morphology was mainly due to the changing trend of the leaf apex and base,petiole length,and degree of leaf *** analysis showed that there was a significant covariation between the leaf symmetrical components and size:as the leaf enlarged,the widest part gradually moved up,and the shape changed from nearly oval to *** results showed that 86.0%and 78.0%of H1 and H2,70.0%and 80.0%of H1 and H3,and 82.0%and 76.0%of H2 and H3 were correctly *** variate analysis results showed that the Mahalanobis distances between H1 and H2,H1 and H3,and H2 and H3 were 1.7238,1.5380,and 1.6329,*** GMMs and TMMs showed significant differences in morphology among the three *** provenances,but GMMs had higher classification accuracy and could provide more information about leaf shape,whereas TMMs could provide more information about leaf *** on our results,GMMs are promising in t

关键词： Traditional morphometrics Geometric morphometrics Leaf morphology variation Quercus dentata Intraspecific

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煤热解研究进展及其发展历程

化工进展 2024年第7期43卷 3620-3636页

作者：曹景沛姚乃瑜庞新博赵小燕赵静平蔡士杰徐敏冯晓博伊凤娇中国矿业大学江苏省碳资源精细化利用工程研究中心江苏徐州221116

在应对“碳中和”的挑战中,我国学者提出了“工程热化学”这一新兴学科。煤热解是一种重要的热化学反应,是工程热化学领域的重要研究内容。面对日益增长的能源需求以及不断恶化的世界环境,煤炭清洁高效利用成为我国的重大战略需求。全... 详细信息

在应对“碳中和”的挑战中,我国学者提出了“工程热化学”这一新兴学科。煤热解是一种重要的热化学反应,是工程热化学领域的重要研究内容。面对日益增长的能源需求以及不断恶化的世界环境,煤炭清洁高效利用成为我国的重大战略需求。全面了解煤热解过程,完善煤热解理论,准确描述煤热解动力学机理,是开发煤的高效热解的基础。本文首先介绍了煤热解的概念、分类及热解过程,进而总结了煤热解机理的研究进展,针对煤热解的ReaxFF MD分子动力学以及热分析动力学进行了详细的分析。阐述了热解过程发生的主要反应、反应的影响因素以及热作用过程中矿物质及杂原子对反应的影响。最后对煤热解工艺发展历程和示范应用进行了总结。

关键词：煤热解热解机理动力学影响因素

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Li-air batteries:air stability of lithium metal anodes

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Science China Chemistry 2024年第1期67卷 122-136页

作者： Renfei Cao Kai Chen Jianwei Liu Gang Huang Wanqiang Liu xinbo Zhang School of Materials Science and Engineering Changchun University of Science and TechnologyChangchun 130022China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChangchun 130022China

Aprotic rechargeable lithium-air batteries(LABs)with an ultrahigh theoretical energy density(3,500 Wh kg^(-1))are known as the‘holy grail’of energy storage systems and could replace Li-ion batteries as the next-generation high-capacity batteries if a practical device could be ***,only a few researches focus on the battery performance and reactions in the ambient air environment,which is a major obstacle to promote the practical application of ***,we have summarized the recent research progress on LABs,especially with respect to the Li metal *** chemical and electrochemical deteriorations of the Li metal anode under the ambient air are discussed in detail,and the parasitic reactions involving the cathode and electrolyte during the charge-discharge processes are *** also provide stability perspectives on protecting the Li metal anodes and propose design principles for realizing high-performance LABs.

关键词： parasitic reaction lithium metal anode anode protection Li-air batteries

Pyramid-resolution person restoration for cross-resolution person re-identification

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Science China(Information Sciences) 2024年第6期67卷 451-452页

作者： Chunlei PENG Bo WANG Decheng LIU Nannan WANG xinbo GAO State Key Laboratory of Integrated Services Networks Xidian University School of Cyber Engineering Xidian University School of Telecommunications Engineering Xidian University Chongqing Key Laboratory of Image Cognition Chongqing University of Posts and Telecommunications

Person images captured by surveillance cameras are typically with various resolutions and are susceptible to pose changes,occlusion and background variations,thus affecting the performance of person Re *** approaches[1,2]either use an image restoration model to restore the lowresolution images to obtain a corresponding high-resolution image,

关键词： Restoration

Retrieval-and-alignment based large-scale indoor point cloud semantic segmentation

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Science China(Information Sciences) 2024年第4期67卷 164-180页

作者： Zongyi XU Xiaoshui HUANG Bo YUAN Yangfu WANG Qianni ZHANG Weisheng LI xinbo GAO School of Computer Science and Technology Chongqing University of Posts and Telecommunications Shanghai Artificial Intelligence Laboratory School of Electronic Engineering and Computer Science Queen Mary University of London

Current methods for point cloud semantic segmentation depend on the extraction of descriptive features. However, unlike images, point clouds are irregular and often lack texture information, making it demanding to extract discriminative features. In addition, noise, outliers, and uneven point distribution are commonly present in point clouds, which further complicates the segmentation task. To address these problems, a novel architecture is proposed for direct and accurate large-scale point cloud segmentation based on point cloud retrieval and alignment. The proposed approach involves using a feature-based point cloud retrieval method for searching for reference point clouds with annotations from a dataset. In the following segmentation stage, an overlap-based point cloud registration method has been developed to align the target and reference point clouds. For accurate and robust alignment, an overlap region estimation module is trained to locate the optimal overlap region between two pieces of point clouds in a coarse-to-fine manner. In the detected overlap region, the global and local features of the points are extracted and combined for featuremetric registration to obtain accurate transformation parameters between the target and reference point clouds. After alignment, the annotated segmentation of the reference is transferred to the target point clouds to obtain accurate segmentation results. Extensive experiments are conducted to show that the developed method outperforms the state-of-the-art approaches in terms of both accuracy and robustness against noise and outliers.

关键词： point cloud semantic segmentation large-scale indoor point clouds point cloud alignment overlap estimation label transfer

Sub-Homogeneous Peridynamic Model for Fracture and Failure Analysis of Roadway Surrounding Rock

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Computer Modeling in Engineering & Sciences 2024年第6期139卷 3167-3187页

作者： Shijun Zhao Qing Zhang Yusong Miao Weizhao Zhang xinbo Zhao Wei Xu School of Science Qingdao University of TechnologyQingdao266520China College of Mechanics and Materials Hohai UniversityNanjing211100China Xibei Mining Co. Ltd.Shandong Energy GroupXi’an710018China

The surrounding rock of roadways exhibits intricate characteristics of discontinuity and *** address these complexities,this study employs non-local Peridynamics(PD)theory and reconstructs the kernel function to represent accurately the spatial decline of long-range ***,modifications to the traditional bondbased PD model are *** considering the micro-structure of coal-rock materials within a uniform discrete model,heterogeneity characterized by bond random pre-breaking is *** approach facilitates the proposal of a novel model capable of handling the random distribution characteristics of material heterogeneity,rendering the PD model suitable for analyzing the deformation and failure of heterogeneous layered coal-rock mass *** established numerical model and simulation method,termed the sub-homogeneous PD model,not only incorporates the support effect but also captures accurately the random heterogeneous micro-structure of roadway surrounding *** simulation results obtained using this model show good agreement with field measurements from the Fucun coal mine,effectively validating the model’s capability in accurately reproducing the deformation and failure mode of surrounding rock under bolt-supported(anchor cable).The proposed subhomogeneous PD model presents a valuable and effective simulation tool for studying the deformation and failure of roadway surrounding rock in coal mines,offering new insights and potential advancements.

关键词： Roadway surrounding rock peridynamics heterogeneous material fracture analysis numerical simulation

Compositional evolution for mixed aerosols containing gluconic acid and typical nitrate and the effect of multiply factors on hygroscopicity

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Journal of Environmental Sciences 2024年第5期139卷 206-216页

作者： Yue Zhu Shufeng pang Yunhong Zhang School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081China

The aging process of atmospheric aerosols usually leads to a mixture of inorganic salts and organic compounds of anthropogenic *** organic compounds,polyhydroxy organic acids are important components,however,the study on composition and hygroscopic properties of the mixture containing inorganics and polyhydroxy organic acids is *** this study,gluconic acid,the proxy of polyhydroxy organic acids,is mixed with the representative nitrate(Mg(NO_(3))_(2),Ca(NO_(3))_(2))to form ***-FTIR and optical microscopy are employed to study the component changes and hygroscopicity as a function of relative *** relative humidity fluctuates,the FTIR-ATR spectra display that the internal mixed gluconic acid(CH_(2)(CH)_(4)(OH)_(5)COOH)and nitrate can react to release acidic gases,forming relevant gluconate and further affecting the *** specific presentation is particles cannot be recovered to their original size after the dehydration-hydration process and there will be some disparities in GF for mixed *** the gluconic acid-Ca(NO_(3))_(2)/Mg(NO_(3))_(2)mixtures with molar ratios of 1:1,higher degree of reaction resulting in the production of large amounts of gluconate should be responsible to the lower hygroscopicity compared to ZSR *** 1:2 gluconic acid-nitrate mixed systems(with higher nitrate content),the hygroscopicity of mixtures are higher than the ZSR prediction.A possible reason could be‘salt-promoting effect’on the organic fractions of the surplus inorganic salt in the *** data can improve the chemical composition list evaluation,in turn hygroscopic properties and phase state of atmospheric aerosol,and then the climate effect.

关键词： Hygroscopicity Gluconic acid Reaction ZSR simulation Size growth factors

Study on Image Recognition Algorithm for Residual Snow and Ice on Photovoltaic Modules

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Energy Engineering 2024年第4期121卷 895-911页

作者： Yongcan Zhu JiawenWang Ye Zhang Long Zhao Botao Jiang xinbo Huang College of Electronics and Information Xi’an Polytechnic UniversityXi’an710048China Xi’an Key Laboratory of Interconnected Sensing and Intelligent Diagnosis for Electrical Equipment Xi’an710048China

The accumulation of snow and ice on PV modules can have a detrimental impact on power generation,leading to reduced efficiency for prolonged ***,it becomes imperative to develop an intelligent system capable of accurately assessing the extent of snow and ice coverage on PV *** address this issue,the article proposes an innovative ice and snow recognition algorithm that effectively segments the ice and snow areas within the collected ***,the algorithm incorporates an analysis of the morphological characteristics of ice and snow coverage on PV modules,allowing for the establishment of a residual ice and snow recognition *** process utilizes both the external ellipse method and the pixel statistical method to refine the identification *** effectiveness of the proposed algorithm is validated through extensive testing with isolated and continuous snow area *** results demonstrate the algorithm’s accuracy and reliability in identifying and quantifying residual snow and ice on PV *** conclusion,this research presents a valuable method for accurately detecting and quantifying snow and ice coverage on PV *** breakthrough is of utmost significance for PV power plants,as it enables predictions of power generation efficiency and facilitates efficient PV maintenance during the challenging winter conditions characterized by snow and *** proactively managing snow and ice coverage,PV power plants can optimize energy production and minimize downtime,ensuring a sustainable and reliable renewable energy supply.

关键词： Photovoltaic(PV)module residual snow and ice snow detection feature extraction image processing