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Groundwater contaminant source identification considering unknown boundary condition based on an automated machine learning surrogate

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Geoscience Frontiers 2024年第1期15卷 402-416页

作者： Yaning xu Wenxi Lu Zidong Pan Chengming Luo Yukun Bai Shuwei Qiu Key Laboratory of Groundwater Resources and Environment Ministry of EducationJilin UniversityChangchun 130021China Jilin Provincial Key Laboratory of Water Resources and Environment Jilin UniversityChangchun 130021China College of New Energy and Environment Jilin UniversityChangchun 130021China School of Water Resources and Environment Hebei GEO UniversityShijiazhuang 050031China

Groundwater contamination source identification(GCSI)is a prerequisite for contamination risk evaluation and efficient groundwater contamination remediation *** boundary condition generally is set as known variables in previous GCSI ***,in many practical cases,the boundary condition is complicated and cannot be estimated accurately in *** the boundary condition as known variables may seriously deviate from the actual situation and lead to distorted identification *** the results of GCSI are affected by multiple factors,including contaminant source information,model parameters,boundary condition,***,if the boundary condition is not estimated accurately,other factors will also be estimated *** study focuses on the unknown boundary condition and proposed to identify three types of unknown variables(contaminant source information,model parameters and boundary condition)*** simulation-optimization(S-O)method is applied to GCSI,the huge computational load is usually reduced by building surrogate ***,when building surrogate models,the researchers need to select the models and optimize the hyperparameters to make the model powerful,which can be a lengthy *** automated machine learning(AutoML)method was used to build surrogate model,which automates the model selection and hyperparameter optimization in machine learning engineering,largely reducing human operations and saving *** accuracy of AutoML surrogate model is compared with the surrogate model used in eXtreme Gradient Boosting method(XGBoost),random forest method(RF),extra trees regressor method(ETR)and elasticnet method(EN)respectively,which are automatically selected in AutoML *** results show that the surrogate model constructed by AutoML method has the best accuracy compared with the other four *** study provides reliable and strong support for GCSI.

关键词： Groundwater contamination source Boundary condition Automated machine learning Surrogate model

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机械辊子上纤维束展宽模型的建立

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复合材料学报 2024年第5期41卷 2704-2712页

作者：徐然许文翀王明欢任峰信春玲何亚东北京化工大学机电工程学院北京100029 教育部高分子材料加工装备工程研究中心北京100029

制备预浸带需要将纤维束铺展变宽以便于树脂浸润,而牵引张力是纤维束展宽的动力来源,当前纤维束的展宽模型少有涉及牵引张力的影响效果。针对纤维束在机械棍子上的牵引展宽过程,结合受力分析得出纤维束运动系统的输入功及沿轴向、横向... 详细信息

制备预浸带需要将纤维束铺展变宽以便于树脂浸润,而牵引张力是纤维束展宽的动力来源,当前纤维束的展宽模型少有涉及牵引张力的影响效果。针对纤维束在机械棍子上的牵引展宽过程,结合受力分析得出纤维束运动系统的输入功及沿轴向、横向上的摩擦消耗功,依据能量守恒原理建立纤维束展宽模型。利用实验室自行搭建的机械棍子预分散装置,对展宽模型进行对比验证与分析。结果表明:牵引张力是纤维束展宽的重要原因,机械辊子个数、半径、光滑程度及纤维束与辊子间的包角都会影响纤维束的展宽,相较于Wilson展宽模型,能量平衡展宽模型能够更好地预测纤维的展开宽度,可用于指导纤维束的预分散过程。

关键词：纤维束展宽能量平衡机械辊子预浸带预分散设备

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Munabulake ophiolitic mélange:Implication for the evolution history of the north branch of the Proto-Tethys ocean

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Geoscience Frontiers 2024年第1期15卷 354-373页

作者： Changfeng Liu Wencan Liu Baoying Ye Zixian Zhao He Su Xin xu China University of Geosciences(Beijing) Beijing 100083China Experimental School of Beijing Ritan High School Beijing 100123China The Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of EducationSchool of Earth and Space SciencesPeking UniversityBeijing 100871China

One of the ophiolites that record the Proto-Tethys Ocean’s episodic closure is the Munabulake ophiolitic mélange,which is situated in the middle of the Kunlun-Qaidam and Altun-Qilian *** field mapping revealed that the Munabulake ophiolitic mélange comprises local(ultramafic rocks,basalts,andesites,gabbros,diorites,and plagiogranites)and exotic(marble,gneiss,schist,and amphibolite)blocks,many of which are in the schist matrix(Qimantage Group).Based on geochronological,geochemical,and petrological observations,the mafic rocks in the Munabulake ophiolitic mélange can be categorized into three categories:498-Ma OIB-like gabbros,468-Ma Hawaiian alkaline basalt-like dolerite and pillow basaltic slices,and 428 Ma massive SSZ-like ultramafic *** 501-452 Ma I-type granites exhibit arc affinities due to the oceanic crust *** findings,along with spatial relationships,suggest that the Early Paleozoic ophiolite complex,island arc rocks,and accretionary complex generated as an intra-oceanic arc system as a result of obduction of the south Altun Ocean’s onto the Central Altun block within a north-directed subduction event.A dextral strike-slip was evident throughout the Early Paleozoic oceanic crust subduction based on the whole set of planar and linear structural data,and the subduction polarity was likely to the *** to the ophiolitic mélange’s youngest rocks and the existence of 413 Ma granite dykes that are widely exposed in the Munabulake ophiolitic mélange,the Munabulake ophiolitic mélange was most likely emplaced during the Middle *** Munabulake ophiolitic mélange is similar in age and petrochemical characteristics to the other ophiolites in the South Altun subduction-collision belt,indicating that the Manabulak ophiolite mélange is a westward extension of the Apa-Mangya subduction-collision belt,which formed during the northward subduction of the South Altun Ocean slab during the Early ***,the final closing ti

关键词： Altun orogenic belt Munabulake Ophiolitic mé lange Early Paleozoic North-dipping subduction

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内蒙古光伏开发空间适宜性及减排效益研究

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干旱区地理 2024年第4期47卷 684-694页

作者：徐伟刘振领内蒙古科技大学土木工程学院内蒙古包头014000

内蒙古自治区作为中国重要的光伏发电基地,近年来盲目建设光伏电站的问题日益突出,掌握区域光伏开发的适宜性、发电潜力和减排效益对光伏产业的健康发展具有重要意义。为了探讨内蒙古自治区光伏开发适宜性与减排效益,综合利用气象、自... 详细信息

内蒙古自治区作为中国重要的光伏发电基地,近年来盲目建设光伏电站的问题日益突出,掌握区域光伏开发的适宜性、发电潜力和减排效益对光伏产业的健康发展具有重要意义。为了探讨内蒙古自治区光伏开发适宜性与减排效益,综合利用气象、自然地理和经济社会数据,通过构建“气象-地形-位置-植被”光伏开发适宜性综合评价指标体系,利用层次分析法确定评价指标的权重,借助地理信息系统工具对内蒙古自治区光伏开发适宜性进行空间显性评价,进而定量评估在不同开发强度下的光伏发电潜力与减排效益,并对各盟市光伏发电潜力与电力需求进行对比分析。结果表明:(1)内蒙古自治区西部的光伏开发适宜性大于中部和东部,各类适宜区主要分布在西部的阿拉善盟和巴彦淖尔市,光伏开发特别适宜、较适宜和适宜区域的面积占内蒙古自治区总面积的23.66%。(2)内蒙古自治区光伏发电潜力巨大,特别适宜的区域开发12.57%即可满足内蒙古自治区2021年用电量。(3)内蒙古自治区光伏发电潜力与电力需求分布有着较强的空间异质性,空间格局特征显著。(4)内蒙古自治区光伏发电的节能减排效果显著,与传统燃煤火力发电相比,若特别适宜区全部开发,年碳减排量约2.947×10^(9)t,是2021年内蒙古自治区碳排放总量的4.46倍,占我国2021年碳排放总量的21.20%。研究结果为内蒙古自治区光伏电站选址和光伏产业的健康发展提供科学参考和指导建议。

关键词：地理信息系统光伏发电适宜性评价发电潜力减排效益内蒙古

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MXetronics-MXene电子学

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无机材料学报 2024年第2期39卷 171-178页

作者：徐向明 Husam N ALSHAREEF 阿卜杜拉国王科技大学沙特阿拉伯图瓦23955-6900

超薄的过渡金属碳氮化合物MXenes,作为一大类新兴二维(2D)材料,是当前材料研究热点方向之一。自2D材料发现至今已有近20年,以石墨烯、过渡金属硫族化合物、黑磷等为代表的2D材料在微纳电子领域经历了相对广泛且深入的研究,MXenes自2011... 详细信息

超薄的过渡金属碳氮化合物MXenes,作为一大类新兴二维(2D)材料,是当前材料研究热点方向之一。自2D材料发现至今已有近20年,以石墨烯、过渡金属硫族化合物、黑磷等为代表的2D材料在微纳电子领域经历了相对广泛且深入的研究,MXenes自2011年诞生以来在微纳电子领域的研究也方兴未艾。MXenes拥有丰富的元素结构组成和独特的物理化学特性(表面亲水性、功函可调、官能团可调、电和离子快速传输特性、表面离子激元、光热电、电磁吸收等),使其在微纳电子领域具有潜在的应用前景。Alshareef课题组近几年致力于将MXene引入到微纳电子领域,并在2019年用MXetronics来定义MXene电子学这一新兴的学术领域。本文简要总结和评价了该领域的代表性进展,梳理了包括微电子级的合成、加工、物性探索和器件应用等方面面临的挑战,最后指出一些关键的研究方向和尚未探索的细分领域。

关键词： MXenes 微纳电子薄膜微纳加工合成晶体管专题评述

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Glycine Attenuates Myocardial Fibrosis in Myocardial Infarction in Rats Partly through Modulating Signal Transducer and Activator of Transcription 3/Nuclear Factor-κB/Transforming Growth Factor-β axis

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World Journal of Traditional Chinese Medicine 2024年第2期10卷 263-270页

作者： Ning Li Yong Wang Chun Li xu Chen xue-Feng Zhang Nan Nan Tan Yi-Qin Hong Ming-Yan Shao Bing-Hua Tang Dong-Qing Guo School of Life Science Beijing University of Chinese MedicineBeijingChina College of Traditional Chinese Medicine Beijing University of Chinese MedicineBeijingChina Modern Research Center of Traditional Chinese Medicine School of Traditional Chinese Material MedicaBeijing University of Chinese MedicineBeijingChina

Objective: Inflammation and fibrosis are strongly associated with each other. Glycine is present in various traditional Chinese medicines and exhibits anti-inflammatory activity. However, the effects of glycine on myocardial fibrosis(MF) in rats with myocardial infarction(MI) have not been reported. The purpose of this study is to investigate the effects of glycine therapy on MF and comprehend its underlying mechanisms. Materials and Methods: Left anterior descending artery ligation-induced MI in Sprague Dawley rats was leveraged to assess the therapeutic effects of Glycine. Rats received either normal saline or glycine(0.5 mg/g bodyweight) for 7 days. Results: Glycine upregulated cardiac ejection fraction and fractional shortening to improve cardiac function, as evaluated by echocardiography. Histological and immunohistochemical analyses demonstrated that glycine could decrease inflammatory cell infiltration and alleviate collagen deposition. Western blotting revealed that nuclear factor-κB(NF-κB)-mediated inflammatory signaling was also downregulated by glycine treatment. The expression of signal transducer and activator of transcription 3(STAT3), tumor necrosis factor-α, and transforming growth factor-β(TGF-β) was decreased significantly in the glycine-treated group compared to the model group. Thus, glycine plays a protective role against myocardial ischemia and subsequent MF. Conclusion: The protective effects of glycine were achieved partly through STAT3/NF-κB/TGF-β signaling pathway.

关键词： Glycine myocardial fibrosis signal transducer and activator of transcription 3/nuclear factor-κB/transforming growth factor-β

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Effects of quantum noise on teleportation of arbitrary two-qubit state via five-particle Brown state

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Chinese Physics B 2024年第8期33卷 204-211页

作者：汪澳魏玉震姜敏李泳成陈虹黄旭 School of Electronics&Information Engineering Soochow UniversitySuzhou 215006China Key Laboratory of System Control and Information Processing Ministry of EducationShanghai 200240China School of Information Engineering Huzhou UniversityHuzhou 313000China

We propose a new protocol for quantum teleportation(QT)which adopts the Brown state as the quantum *** work focuses on the teleportation of a single unknown two-qubit state via a Brown state channel in an ideal *** validate the effectiveness of our proposed scheme,we conduct experiments by using the quantum circuit simulator ***,we investigate the effects of four noisy channels,namely,the phase damping noise,the bit-flip noise,the amplitude damping noise,and the phase-flip ***,we employ Monte Carlo simulation to elucidate the fidelity density under various noise *** analysis demonstrates that the fidelity of the protocol in a noisy environment is influenced significantly by the amplitude of the initial state and the noise factor.

关键词： quantum communication Brown state fidelity

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元代织金锦的分类考据及不同品种的交流融合

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丝绸 2024年第7期61卷 133-140页

作者：茅惠伟徐铮浙江纺织服装职业技术学院文化研究院宁波315211 中国美术学院手工艺术学院杭州310024 中国丝绸博物馆陈列保管部杭州310002

织金锦是元代最具特色的织物,元时期流行的织金锦包括西来的纳石失和中国传统的金段子。文章以中西交流为背景,首先采用分类考据的方式,爬梳各类史料汇编,将纳石失和金段子进一步细化分析,认为“素纳石失”也许是织造过程中使用金纬较少... 详细信息

织金锦是元代最具特色的织物,元时期流行的织金锦包括西来的纳石失和中国传统的金段子。文章以中西交流为背景,首先采用分类考据的方式,爬梳各类史料汇编,将纳石失和金段子进一步细化分析,认为“素纳石失”也许是织造过程中使用金纬较少,且面料更适合夏季的纳石失,也可能是没有起花的织金锦。而“草金段子”大概率是来自民间作坊,品级相对较低的金段子。其次通过实物分析,从织造工艺的角度切入,发现随着纳石失而来的特结锦结构与中国传统的地络类插金组织结构产生了融合,使得传统金段子的织造技术发生了改变。最后以一件元代织金袍服作为典型案例分析,展示东西文化的融合,认为织金锦是文明互鉴的重要物证。

关键词：纳石失金段子特结锦地络类组织分类考据交流融合

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Recycled polymer:Green roads for polyester plastics

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Green Carbon 2024年第1期2卷 1-11页

作者： Rulin Yang Guangqiang xu Wenjie Tao Qinggang Wang Yong Tang Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Shandong Energy Institute Qingdao 266101China Qingdao New Energy Shandong Laboratory Qingdao 266101China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

Plastics are integral to numerous significant social ***,their contribution to environmental pollution and climate crises cannot be disregarded,as their negative impact on the environment increases with incremental production capacity and *** global action is urgently required to promote the green recycle of plastics to prevent their accumulation in the environment and mitigate carbon *** review aims to reveal the paths of green development for polyester plastics,incorporating the trends of the green revolution in mature commercial polyester plastics,newly emerging biodegradable polyester plastics,and future polyester plastics.A critical discussion was conducted on the current and potential future research areas from multiple perspectives,including raw materials,processes,and recycling,to propel us into a future marked by sustainability.

关键词： Recycled polymer Polyester plastics Recycling Bio-based Plastic economy

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硫化剂结构对油溶性Mo基催化剂硫化的影响

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石油炼制与化工 2024年第4期55卷 13-18页

作者：彭芳许可中国石化茂名分公司广东茂名525000 中石化石油化工科学研究院有限公司

选取了5种不同结构的硫化物作为硫化剂,以油溶性有机钼催化剂MACC为研究对象进行催化剂硫化试验,考察硫化剂结构对催化剂硫化形成的活性中心结构、形貌、分布以及粒度的影响。结果表明,试验条件下,二苯并噻吩和甲硫醚很难与催化剂发生... 详细信息

选取了5种不同结构的硫化物作为硫化剂,以油溶性有机钼催化剂MACC为研究对象进行催化剂硫化试验,考察硫化剂结构对催化剂硫化形成的活性中心结构、形貌、分布以及粒度的影响。结果表明,试验条件下,二苯并噻吩和甲硫醚很难与催化剂发生硫化反应生成活性中心,十二硫醇、二甲基二硫醚(DMDS)以及升华硫均可与催化剂反应生成活性中心,且十二硫醇作为硫化剂时得到的活性相MoS 2条纹数更少、分散度更高,DMDS和升华硫作为硫化剂时得到的样品硫化度更高(约90%)。模拟MACC催化剂在原料混合罐工况下发生硫化反应,结果表明,二苯并噻吩不能实现MACC催化剂硫化,而升华硫在混合罐条件下可达到较高的硫化度。

关键词：硫化剂油溶性Mo基催化剂硫化度

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