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Sol-gel synthesis of nanometer silicon/silicon suboxide/carbon anode material

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Baosteel Technical Research 2024年第2期18卷 12-18页

作者： QIN Tong WANG Zheng li zhengzheng Carbon Research Institute Baowu Carbon Technology Co.Ltd.Shanghai 201999China

A stacked Si/SiO_(x)/C composite anode material with carbon-coated structure was prepared by sol-gel method combined with carbothermal reduction using organic *** results of X-ray diffractometry, scanning electron microscopy, and elemental analysis show that the Si/SiO_(x)/C material is a secondary particle with a porous micronanostructure, and the presence of nanometer silicon does not affect the carbothermal reduction and carbon *** test results indicate that the specific capacity and first coulombic efficiency of SiO_(x)/C composite with nanometer silicon can be increased to 1 946.05 mAh/g and 76.49%,*** reversible specific capacity of Si/SiO_(x)/C material blended with graphite is 749.69 mAh/g after 100 cycles at a current density of 0.1 C,and the capacity retention rate is up to 89.03%.Therefore, the composite has excellent electrochemical cycle stability.

关键词： sol-gel method nanometer silicon silicon suboxide anode material

普洱市景谷河水资源综合利用与水环境保护协调发展研究

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人民珠江 2024年第S01期45卷 301-306页

作者：李争铮云南省水文水资源局普洱分局云南普洱665000

协调发展与保护的关系,在生态环境领域是一个世界性难题,也是一个永恒的课题。如何处理开发-保护与保护-开发的契合,是新时期生态文明建设的关键点。以普洱市景谷河开发利用预期和水环境保护为目标,对水资源开发利用现状评价分析,提出... 详细信息

协调发展与保护的关系,在生态环境领域是一个世界性难题,也是一个永恒的课题。如何处理开发-保护与保护-开发的契合,是新时期生态文明建设的关键点。以普洱市景谷河开发利用预期和水环境保护为目标,对水资源开发利用现状评价分析,提出实施绿色综合利用工程选址、规划、设计、施工等各环节保护建议。对景谷河水库淹没12.5 km水体,以及受水库调度影响径流时程的河段采用水文学方法,选用Tennant法、Qp法和月流量变动法进行生态流量阈值研究,设置预警等级,强调河湖生态保障和动态监控,加强水资源调度管理,保障水资源综合利用效益预期与水环境保护协调发展。

关键词：水资源综合利用水环境保护协调发展景谷河

下肢外骨骼机器人交互力激励估计与稳定性分析

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机器人 2024年第1期46卷 54-67页

作者：汪步云李正正许德章程军梁艺杨鸥安徽工程大学人工智能学院安徽芜湖241000 安徽工程大学机械工程学院安徽芜湖241000 芜湖云擎机器人科技有限公司安徽芜湖241007

为解决下肢外骨骼助行稳定性判据忽略人机交互需求的问题,提出了一种考虑人机交互力的助行稳定性判别和助行速度优化方法。首先,建立并分析了人行走和人-机协同行走的倒立摆模型,并融合质心加速度和足底压力信息来间接表达难以测量的人... 详细信息

为解决下肢外骨骼助行稳定性判据忽略人机交互需求的问题,提出了一种考虑人机交互力的助行稳定性判别和助行速度优化方法。首先,建立并分析了人行走和人-机协同行走的倒立摆模型,并融合质心加速度和足底压力信息来间接表达难以测量的人机交互力,进而给出了CoM-CoP-CoA(质心-足压中心-加速度合成点)数学表达式,探究了人机交互力对外骨骼助行稳定性的影响。其次,在上述数学表达式的基础上,采用区域比较法,提出了基于矩阵不等式的外骨骼助行稳定性判据。再次,为探究助行速度与稳定裕度的关联关系,通过改进的稳定裕度描述法,提出了一种稳定裕度评价函数,用以优化外骨骼的助行速度。最后,开展了3种助行速度下的人机协同行走对比实验,分析了实验结果,并优化了人机协同行走时的速度。实验结果表明,所提出的稳定性判据和评价函数能够实现对外骨骼助行稳定性的判别及助行速度的优化。

关键词：下肢外骨骼机器人人机交互多模信息融合助行稳定性稳定裕度优化

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黄土筑坝填方工程地质问题及处理措施分析

西北水电 2024年第1期 27-32,39页

作者：李征征高晓雯王璋李同录中国电建集团西北勘测设计研究院有限公司西安710065 信电综合勘察设计研究院有限公司西安710054 长安大学西安710054 黄土高原水循环与地质环境教育部野外科学观测研究站甘肃正宁745300

针对黄土地区的填方工程地质问题,以陕西铜川老虎沟填方工程为依托,通过地质调查与测绘、地质勘探、原位测试及室内试验等勘察手段,对工程存在的工程地质问题进行了分析研究。结果表明:老虎沟填方工程存在不良地质作用、不稳定高边坡、... 详细信息

针对黄土地区的填方工程地质问题,以陕西铜川老虎沟填方工程为依托,通过地质调查与测绘、地质勘探、原位测试及室内试验等勘察手段,对工程存在的工程地质问题进行了分析研究。结果表明:老虎沟填方工程存在不良地质作用、不稳定高边坡、地下水疏排及填方地基变形等工程地质问题,应对挖方区高边坡进行1∶0.5~1∶0.75的放坡,反压坡脚,并预留平台及马道;对填方区土料进行强夯、碾压,消除其湿陷性,建议设计最大干密度值为1.73 g/cm^(3),最优含水率值为17.3%,压实系数为0.95~0.97;挡土坝坝基建议挖除不良土层,挡土坝坝坡采取加筋土筑坡,坡度宜为45°,坡面需做好防冲刷防护措施;排水沟底宜选用粘性较小的黄土回填,地表采用粘性较大的红粘土回填,并在地表设置完善的排水系统;工后应结合土水监测方案,实时监测填方区内土水变化。该研究成果可为黄土地区类似填方工程建设提供参考。

关键词：工程地质问题黄土填方处理措施监测措施

RBM4 dictates ESCC cell fate switch from cellular senescence to glutamine-addiction survival through inhibiting LKB1-AMPK-axis

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Signal Transduction and Targeted Therapy 2023年第5期8卷 2363-2383页

作者： Lei Chen Wenjing Zhang Dan Chen Quan Yang Siwen Sun Zhenwei Dai zhengzheng li Xuemei liang Chaoqun Chen Yuexia Jiao lili Zhi lianmei Zhao Jinrui Zhang Xuefeng liu Jinyao Zhao Man li Yang Wang Yangfan Qi Institute of Cancer Stem Cells and the Second Affiliated Hospital of Dalian Medical University Dalian Medical UniversityDalian116044China Department of Pathology the First Affiliated Hospital of Dalian Medical UniversityDalian116011China Department of Oncology the Second Affiliated Hospital of Dalian Medical UniversityDalian116023China Department of Thoracic Surgery the First Affiliated Hospital of Dalian Medical UniversityDalian116011China Research Center the Fourth Hospital of Hebei Medical UniversityShijiazhuang050011China

Cellular senescence provides a protective barrier against tumorigenesis in precancerous or normal tissues upon distinct ***,the detailed mechanisms by which tumor cells evade premature senescence to malignant progression remain largely *** we reported that RBM4 adversely impacted cellular senescence to favor glutamine-dependent survival of esophageal squamous cell carcinoma(ESCC)cells by dictating the activity of LKB1,a critical governor of cancer *** level of RBM4 was specifically elevated in ESCC compared to normal tissues,and RBM4 overexpression promoted the malignant ***4 contributed to overcome H-RAS-or doxorubicin-induced senescence,while its depletion caused P27-dependent senescence and proliferation arrest by activating LKB1-AMPK-mTOR ***,RBM4 competitively bound LKB1 to disrupt the LKB1/STRAD/MO25 heterotrimeric complex,subsequently recruiting the E3 ligase TRIM26 to LKB1,promoting LKB1 ubiquitination and degradation in ***,such molecular process leads to bypassing senescence and sustaining cell proliferation through the activation of glutamine ***,the ESCC patients with high RBM4 and low LKB1 have significantly worse overall survival than those with low RBM4 and high *** RBM4 high/LKB1 low expression confers increased sensitivity of ESCC cells to glutaminase inhibitor CB-839,providing a novel insight into mechanisms underlying the glutamine-dependency to improve the efficacy of glutamine inhibitors in ESCC therapeutics.

关键词： LKB1 ESCC protective

The underappreciated role of fugitive VOCs in ozone formation and health risk assessment emitted from seven typical industries in China

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Journal of Environmental Sciences 2024年第2期136卷 647-657页

作者： Zhiling liang Yunjiang Yu Bingbing Sun Qian Yao Xihua lin Yongsheng Wang Jianping Zhang Yingzi li Xuefeng Wang zhengzheng Tang Shexia Ma College of Environmental and Chemical Engineering Shanghai University of Electric PowerShanghai 200090China State Environmental Protection Key Laboratory of Environmental Protection Health Risk Assessment South China Institute of Environmental SciencesMinistry of Ecology and EnvironmentGuangzhou 510535China Henan Jiyuan Ecological Environment Testing Center Jiyuan 454650China Ecological Environment Bureau of Jiyuan Production City Integration Demonstration Zone Jiyuan 454650China

Fugitive emission from industrial sources may result in ozone formation and health risk,while the exact contribution of this source remains incompletely *** this study,emission characteristics,ozone formation potential(OFP)and health risk of fugitive VOCs in7 representative industries were *** material industry was the dominant contributor to VOCs of fugitive emission in comparison with other *** OFP of VOCs from fugitive emission was in the range of 1.45×10^(3)-3.98×10^(5)μg/m^(3),with a higher value than that of organized emission in seven industries except for the coking industry and the chemical material industry,suggesting that fugitive VOCs should be taken into account while developing control ***,m,p-xylene,n-nonane,ethylene,vinyl chloridethe and other high OFP-contributing species were the major reactive species that should be *** risk assessment investigated non-cancer and cancer risks of fugitive VOCs in 7 industries were all above safe level(HR>1 and LCR>1×10^(-4)),posing remarkable health threats to human *** were the main contributor to non-cancer risk,while halohydrocarbons and aromatics contributed most to cancer risks,posing remarkable health threat on human *** findings highlighted the contribution of fugitive VOCs on ozone formation and health risk was underestimated,indicating which should be considered in emission control strategies of industrial sources.

关键词： Industrial sources Volatile organic compounds Fugitive emission Ozone formation potential Health risk assessment

Driver Fatigue Detection System Based on Colored and Infrared Eye Features Fusion

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Computers, Materials & Continua 2020年第6期63卷 1563-1574页

作者： Yuyang Sun Peizhou Yan zhengzheng li Jiancheng Zou Don Hong School of Mathematical Sciences Capital Normal UniversityBeijing100048China School of Electrical and Control Engineering North China University of TechnologyBeijing100144China School of Sciences North China University of TechnologyBeijing100144China Department of Mathematical Sciences Middle Tennessee State UniversityMurfreesboroTN 37132USA

Real-time detection of driver fatigue status is of great significance for road traffic *** this paper,a proposed novel driver fatigue detection method is able to detect the driver’s fatigue status around the *** driver’s face images were captured by a camera with a colored lens and an infrared lens mounted above the *** landmarks of the driver’s face were labeled and the eye-area was *** calculating the aspect ratios of the eyes,the duration of eye closure,frequency of blinks and PERCLOS of both colored and infrared,fatigue can be *** on the change of light intensity detected by a photosensitive device,the weight matrix of the colored features and the infrared features was adjusted adaptively to reduce the impact of lighting on fatigue *** samples of the driver’s face were recorded in the test *** training the classification model,the results showed that our method has high accuracy on driver fatigue detection in both daytime and nighttime.

关键词： Driver fatigue detection feature fusion colored and infrared eye features

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区域信息化发展水平融合评价体系模型研究

河北师范大学学报（自然科学版） 2024年第2期48卷 109-118页

作者：贾金娜李铮铮刘耀周西安工商学院信息与工程学院陕西西安710032 河北省电子学会河北石家庄050061

信息化发展水平评价是准确掌握信息化发展现状和存在问题的重要途径,是有针对性地制定相关政策、赋能经济和社会高质量发展的重要依据.在数字中国建设大背景下,结合信息化发展形势,构建了省市级别信息化发展水平三级评价指标体系,介绍... 详细信息

信息化发展水平评价是准确掌握信息化发展现状和存在问题的重要途径,是有针对性地制定相关政策、赋能经济和社会高质量发展的重要依据.在数字中国建设大背景下,结合信息化发展形势,构建了省市级别信息化发展水平三级评价指标体系,介绍了采用层次分析法计算各指标权重的详细过程,给出了分类指数和发展指数合成的定量分析方法,以及综合模糊评判的定性分析模型与算法,提出了定量计算和定性分析相融合的评价模型,并以河北省2021年度信息化发展水平评价为实例对融合评价体系进行了验证.研究结果表明,该体系模型能够全面真实地反映当地信息化建设成效,对信息化建设从注重“量”向注重“质”的转变具有显著促进作用.

关键词：信息化水平评价指标体系 AHP 模糊综合评判融合评价

地被植物资源分类与特征及在园林景观中的应用

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分子植物育种 2022年第24期20卷 8303-8307页

作者：李峥峥郑州升达经贸管理学院郑州451191

地被植物主要针对覆盖于裸露地面之上的一类低矮植物,有着显著的防尘、降温、改善空气温度、净化空气、固土护坡特点,尤其在土壤不良、树荫浓密、树根暴露的区域,地被植物能够取代草坪。本研究基于生活型划分地被植物资源,分析了地被植... 详细信息

地被植物主要针对覆盖于裸露地面之上的一类低矮植物,有着显著的防尘、降温、改善空气温度、净化空气、固土护坡特点,尤其在土壤不良、树荫浓密、树根暴露的区域,地被植物能够取代草坪。本研究基于生活型划分地被植物资源,分析了地被植物资源的形态和生态特征,系统地阐述了地被植物的园林应用潜力,对地被植物应用于园林景观提出了建议。

关键词：地被植物分类与特征园林应用