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Journal of Forestry Research 2024年第2期35卷 134-145页

作者： Teng li Jianfeng Peng Tsun Fung Au jinbao li School of Geography and Remote Sensing Guangzhou UniversityGuangzhou 510006People’s Republic of China College of Geography and Environmental Science Henan UniversityKaifeng 475004People’s Republic of China Institute for Global Change Biology School for Environment and SustainabilityUniversity of MichiganAnn ArborMIUSA Department of Ecology and Evolutionary Biology University of MichiganAnn ArborMIUSA Department of Geography University of Hong KongHong Kong SARPeople’s Republic of China HKU Shenzhen Institute of Research and Innovation Shenzhen 518057People’s Republic of China

Minimum temperatures have remarkable impacts on tree growth at high-elevation sites on the Tibetan Plateau,but the shortage of long-term and high-resolution paleoclimate records inhibits understanding of recent minimum temperature *** this study,a warm season(April–September)reconstruction is presented for the past 467 years(1550–2016)based on Sabina tibetica ring-width chronology on the lianbaoyeze Mountain of the central eastern Tibetan *** warm periods and eight cold periods were ***-term minimum temperature variations revealed a high degree of coherence with nearby *** correlations between our reconstruction and global sea surface temperatures suggest that warm season minimum temperature anomalies in the central eastern Tibetan Plateau were strongly influenced by large-scale ocean atmospheric circulations,such as the El Ni?o-Southern Oscillation and the Atlantic Multidecadal Oscillation.

关键词： Tree-ring analysis Sabina tibetica Minimum temperatures Central eastern Tibetan Plateau Climate change

Dendroclimatological study of Sabina saltuaria and Abies faxoniana in the mixed forests of the Qionglai Mountains,eastern Tibetan Plateau

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Journal of Forestry Research 2024年第1期35卷 72-82页

作者： Teng li Jianfeng Peng Tsun Fung Au Jingru li jinbao li Yue Zhang School of Geography and Remote Sensing Guangzhou UniversityGuangzhou 510006People’s Republic of China College of Geography and Environmental Science Henan UniversityKaifeng 475004People’s Republic of China Institute for Global Change Biology School for Environment and SustainabilityUniversity of MichiganAnn ArborMIUSA Department of Ecology and Evolutionary Biology University of MichiganAnn ArborMIUSA Department of Geography University of Hong KongHong Kong SARPeople’s Republic of China HKU Shenzhen Institute of Research and Innovation Shenzhen 518057People’s Republic of China

Tree-ring chronologies were developed for Sabina saltuaria and Abies faxoniana in mixed forests in the Qionglai Mountains of the eastern Tibetan ***-growth relationship analysis indicated that the two co-exist-ing species reponded similarly to climate factors,although *** was more sensitive than *** strong-est correlation was between *** chronology and regional mean temperatures from June to *** on this relationship,a regional mean temperature from June to November for the period 1605-2016 was *** explained 37.3%of the temperature variance during th period *** major warm periods and five major cold periods were *** analysis detected significant interannual and multi-decadal *** also revealed the influence of the Atlantic Multi-decadal Oscillation,confirming its importance on climate change on the eastern Tibetan Plateau.

关键词： Tree-ring analysis Mixed forests Dendroclimatology Qionglai Mountains

Climate-growth relationships of Pinus tabuliformis along an altitudinal gradient on Baiyunshan Mountain,Central China

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Journal of Forestry Research 2024年第1期35卷 202-212页

作者： Xiaoxu Wei Jianfeng Peng jinbao li Jinkuan li Meng Peng Xuan li Yameng liu Jiaxin li College of Geography and Environmental Science Henan UniversityKaifeng 475004People’s Republic of China Key Laboratory of Earth System Observation and Simulation of He’nan Province Kaifeng 475004People’s Republic of China Department of Geography University of Hong KongPokfulamHong Kong SARPeople’s Republic of China HKU Shenzhen Institute of Research and Innovation Shenzhen 518057People’s Republic of China

A set of standard chronologies for tree-ring width(TRW),earlywood width(EWW)and latewood width(LWW)in Pinus tabuliformis *** an altitudi-nal gradient(1450,1400,and 1350 m a.s.l.)on Baiyunshan Mountain,Central China to analyze the effect of varying temperature and precipitation on growth along the *** analyses showed that at all three altitudes and the TRW and EWW chronologies generally had signifi-cant negative correlations with mean and maximum tem-peratures in the current April and May and with minimum temperatures in the prior July and August,but significant positive correlations with precipitation in the current *** were generally significantly negative between LWW chronologies and all temperatures in the prior July and August,indicating that the prior summer temperature had a strong lag effect on the growth of *** that increased with *** correlation with the standard-ized precipitation evapotranspiration index(SPEI)confirmed that wet conditions in the current May promoted growth of TR and EW at all *** altitudinal differences were also found;at 1400 m,there were significant positive correlations between EWW chronologies and SPEI in the current April and significant negative correlations between LWW chronologies and SPEI in the current September,but these correlations were not significant at 1450 *** 1350 m,there were also significant negative correlations between the TRW and the EWW chronologies and SPEI in the prior October and the current July and between LWW chronology and SPEI in the current August,but these cor-relations were not significant at 1400 *** correlation results showed a stable response of EWW in relation to the SPEI in the current May at all three altitudes and of LWW to maximum temperature in the prior July-August at 1400 m from 2002 to *** EWW chronology at 1400 m and the LWW chronology at 1450 m were identified as more suitable for climate reconstruction.T

关键词： Tree rings Climate response Altitudinal gradient Baiyunshan Mountain Pinus tabuliformis Carr

Microenvironmental effects on growth response of Pinus massoniana to climate at its northern boundary in the Tongbai Mountains,Central China

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Journal of Forestry Research 2024年第1期35卷 44-57页

作者： Jianfeng Peng Jiayue Cui jinbao li Meng Peng Yongtao Ma Xiaoxu Wei Jinkuan li Xuan li Yamen liu Jiaxin li College of Geography and Environmental Science Henan UniversityKaifeng 475004People’s Republic of China Key Laboratory of Earth System Observation and Simulation of Henan Province Kaifeng 475004People’s Republic of China Department of Geography University of Hong KongHong KongSARPeople’s Republic of China HKU Shenzhen Institute of Research and Innovation Shenzhen 518057People’s Republic of China Henan Academy of Forestry Zhengzhou 450000People’s Republic of China

The Tongbai Mountains is an ecologically sensi-tive region and the northern boundary of Pinus massoniana *** analyze the effect of different microenvironments on tree growth response to climate factors,we developed standard chronologies for earlywood width(EWW),late-wood width(LWW),and total ring width(TRW)of *** at two sampling sites on slopes with different orientations,then analyzed characteristics of the chronolo-gies and their correlations with climate variables from five stations in the region and with a regional normalized differ-ence vegetation index(NDVI).Statistical results showed that the TRW/EWW/LWW chronology consistency and charac-teristics(mean sensitivity,signal to noise ratio,expressed population signal)for trees growing on the southeastern slope were much higher than for trees on the northeastern *** indicated that temperature in current March and August has a significant positive effect on TRW/EWW/LWW formation,and the effect on the northeastern slope was weaker than on the southeastern *** to temperature,precipitation has more complicated effects on tree growth,but the effect on the northeastern slope was also generally weaker than on the southeastern ***-wise linear regression analyses showed that temperature in August was the main limiting factor at the two sampling ***,the response of tree growth on the southeast-ern slope as determined by the NDVI is better than on the northeastern slope,and the TRW/EWW/LWW chronologies for the southeastern slope explained over 50%of the total NDVI variances in ***,the results indicate that the difference in the climate response of *** at two sampling sites is clearly caused by differences in the microenvironment,and such differences should be properly considered in future studies of forest dynamics and climate reconstructions.

关键词： Tree-rings Pinus massoniana lamb Microenvironment Radial growth Climate-growth response

Flexible mille-feuille structure electromagnetic interference shielding film with excellent thermal conductivity and Joule heating

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Nano Research 2024年第5期17卷 4544-4554页

作者： Dingwen Yin Huijuan Xiu Simin Wang Yanfei Pan Na li Rui Cheng Shaoyan Huang Sha Fan jinbao li College of Bioresources Chemical&Materials Engineering Shaanxi University of Science&TechnologyXi'an 710021China National Demonstration Center for Experimental light Chemistry Engineering Education Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper DevelopmentXi'an 710021China College of Material Science and Art Design Inner Mongolia Agricultural UniversityHohhot 010018China

The intelligent electronic devices have urgent demands for electromagnetic interference(EMI)shielding films with excellent heat dissipation ***,it is challenging to obtain excellent EMI shielding and thermal conductivity performances ***,inspired by mille-feuille structure,the multifunctional EMI shielding films developed by a layer-by-layer self-assembly and hot-pressing *** ingenious introduction of silver nanoparticles(AgNPs)with large specific surface area and highly conductive into the network formed by TEMPO-oxidized cellulose nanofibrils(TOCNFs)with large aspect ratio to form the TOCNFs/*** the graphene nanoplates(GNPs)with high conductivity loss distributed alternately with TOCNFs/AgNPs to construct mille-feuille structure,which had highly efficient conductive network,complete thermally conduction pathway and rich heterogeneous ***,the designed films presented high electrical conductivity of 8520 S/cm,superb EMI effectiveness(SE)of 98.05 dB,and excellent thermal conductivity of 18.82 W/(m·K).Furthermore,the films possessed outstanding Joule heating performances with low voltages,including high heating temperature(100℃),fast response time(lity and ***,such high-performance EMI shielding films with fascinating thermal conductivity and Joule heating performances have substantial application in flexible electronics,electromagnetic waves shielding and thermal management.

关键词： TEMPO-oxidized cellulose nanofibrils/silver nanoparticles(TOCNFs/AgNPs) mille-feuille structure electromagnetic interference shielding thermal conductivity Joule heating

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提高油气场站自控系统数据稳定性的策略研究

仪器仪表用户 2024年第9期31卷 7-9页

作者：李进保中国石油玉门油田公司

本研究深入探讨了油气场站自控系统数据稳定性的提升策略，聚焦于解决系统中的技术难题如数据传输的稳定性和抗干扰能力。通过分析现有系统的结构风险和技术、管理及环境因素的影响，提出了一系列改进措施，包括硬件升级、软件优化以及... 详细信息

本研究深入探讨了油气场站自控系统数据稳定性的提升策略，聚焦于解决系统中的技术难题如数据传输的稳定性和抗干扰能力。通过分析现有系统的结构风险和技术、管理及环境因素的影响，提出了一系列改进措施，包括硬件升级、软件优化以及管理操作的优化。研究还强调了创新技术如人工智能和物联网在优化自控系统中的应用，以及环境保护和安全性的重要性。这些策略不仅旨在提升数据完整性和系统响应效率，还致力于降低操作错误率，并优化成本效益，为油气场站的可持续运营提供了坚实的技术支持。

关键词：油气场站自控系统数据稳定性硬件升级软件优化

智能传播时代大型体育赛事的媒介话语构建策略与反思——兼议国内三大主要平台2022年卡塔尔世界杯传播实践

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武汉体育学院学报 2024年第2期58卷 7-14页

作者：李金宝鲁恒志李馨雅南京体育学院体育教育与人文学院江苏南京210014 江苏文都创意城市研究院江苏南京210000

四年一届的世界杯,是媒体建构自己传播话语的重要机会。媒介话语研究已经从内在的媒介文本结构走向涵盖媒介生产-文本-受众等多环节的动态建构。在卡塔尔世界杯媒介话语构建中,获得中央广播电视总台授权的咪咕视频、抖音,利用自己平台... 详细信息

四年一届的世界杯,是媒体建构自己传播话语的重要机会。媒介话语研究已经从内在的媒介文本结构走向涵盖媒介生产-文本-受众等多环节的动态建构。在卡塔尔世界杯媒介话语构建中,获得中央广播电视总台授权的咪咕视频、抖音,利用自己平台特点实现了自身的媒介话语构建。从内容、技术、资本等视角分析央视、咪咕视频、抖音三家平台对卡塔尔世界杯的媒介话语构建策略,总结智能传播时代传播平台在平台框架、商业逻辑、新媒体技术、版权利用中的媒介策略构建方法。从话语霸权、官方与民间话语疏离、技术掌控下娱乐至上等方面,分析在竞争与合作模式下,对新技术引领的大型体育赛事传播媒介话语构建的反思。

关键词：智能传播媒介话语体育赛事媒介建构传播技术

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桩基检测技术在建筑工程中的应用

中国厨卫 2024年第7期23卷 148-150页

作者：李金宝山东安硕建设项目管理有限公司山东枣庄277100

桩基作为建筑物的基础结构之一,承载能力直接影响着整个建筑物的稳定性和安全性,因此对桩基的检测非常重要。文章主要分析了桩基检测技术在建筑工程中的应用要点,并阐述了桩基检测技术在建筑工程中的具体应用措施,提出了应用过程中的注... 详细信息

桩基作为建筑物的基础结构之一,承载能力直接影响着整个建筑物的稳定性和安全性,因此对桩基的检测非常重要。文章主要分析了桩基检测技术在建筑工程中的应用要点,并阐述了桩基检测技术在建筑工程中的具体应用措施,提出了应用过程中的注意事项。研究结果表明,只有根据项目的实际情况,选择科学合理的桩基检测技术,才能有效确保建筑工程的整体施工质量,延长使用寿命。

关键词：建筑工程桩基检测桩基承载力

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全过程工程咨询现状分析及对策研究

工程造价管理 2024年第4期35卷 51-55页

作者：李莉李金保宁夏回族自治区建设工程造价管理站宁夏银川750001

2021年10月,中共中央办公厅、国务院办公厅发布的《关于推动城乡建设绿色发展的意见》中要求:“推动传统建筑业转型升级,完善工程建设组织模式,加快推行工程总承包,推广全过程工程咨询,推进民用建筑工程建筑师负责制。”这预示着全过程... 详细信息

2021年10月,中共中央办公厅、国务院办公厅发布的《关于推动城乡建设绿色发展的意见》中要求:“推动传统建筑业转型升级,完善工程建设组织模式,加快推行工程总承包,推广全过程工程咨询,推进民用建筑工程建筑师负责制。”这预示着全过程工程咨询将得到更大范围、更深层次的推行。文章从全过程工程咨询发展背景、历史沿革角度展开,通过收集整理宁夏回族自治区工程造价咨询及相关业务具体数据,并进行分析比对,阐述了宁夏回族自治区全过程工程咨询发展现状,并结合实际全过程工程咨询案例,深入分析全过程工程咨询系统实践进程、主要质量、安全、资金控制点,总结出制约全过程工程咨询发展的因素,并对推动全过程工程咨询发展提出几点措施建议,为全过程工程咨询工作推进提供参考。

关键词：全过程工程咨询业务融合发展制约因素

基于辛叠加方法的正交各向异性矩形悬臂薄板受迫振动解析解

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应用数学和力学 2024年第9期45卷 1117-1132页

作者：王森林李进宝马红艳李锐大连理工大学工程力学系工业装备结构分析优化与CAE软件全国重点实验室辽宁大连116024

基于辛叠加方法研究了正交各向异性矩形悬臂薄板在谐载载荷作用下的受迫振动问题.首先从薄板受迫振动的基本方程出发,将问题导入到Hamilton体系,并将原问题拆分为若干子问题,然后在辛空间中利用分离变量和本征展开方法推导出子问题的解... 详细信息

基于辛叠加方法研究了正交各向异性矩形悬臂薄板在谐载载荷作用下的受迫振动问题.首先从薄板受迫振动的基本方程出发,将问题导入到Hamilton体系,并将原问题拆分为若干子问题,然后在辛空间中利用分离变量和本征展开方法推导出子问题的解析解,最后通过叠加求解出悬臂薄板受迫振动的解析解.辛叠加方法的主要优点是经过逐步严格推导获得解析解,不需要对解的形式做任何假设,突破了传统半逆解法的限制.算例针对不同谐载载荷情况进行了数值计算,并将该文方法与有限元方法获得的结果进行比较,验证了该文方法的可靠性和精确性.

关键词：辛叠加方法正交各向异性薄板解析解受迫振动