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Experimental design of paraffin/methylated melamine-formaldehyde microencapsulated composite phase change material and the application in battery thermal management system

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Journal of Materials Science & Technology 2024年第2期169卷 124-136页

作者： Que Huang silong wang Jichun He Dengji Xu Safaa NAbdou Mohamed MIbrahim Shiqi Sun Yanjun Chen Handong Li Ben Bin Xu Changcheng Liu Zeinhom M.El-Bahy Zhanhu Guo School of Environment and Safety Engineering North University of ChinaTaiyuan 030051China Institute of Advanced Energy Materials and Systems North University of ChinaTaiyuan 030051China School of Resources and Safety Engineering Central South UniversityChangsha 410010China School of Medical and BioInformation Engineering Northeastern UniversityShenyang 110819China Department of Chemistry Khurmah University CollegeTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt

In order to maintain the optimal operating temperature of the battery surface and meet the demand for thermal storage technology,battery thermal management system based on phase change materials has attracted increasing *** this work,a kind of core-shell structured microcapsule was synthesized by an in-situ polymerization,where paraffin was used as the core,while methanol was applied to mod-ify the melamine-formaldehyde shell to reduce toxicity and improve thermal ***,three different types of heat conductive fillers with the same content of 10 wt.%,i.e.,nano-Al_(2)O_(3),nano-ZnO and carbon nanotubes were added,generating *** microcapsules were uniform,and were not affected by the thermal fillers,which were evenly dispersed *** composite sample with carbon nanotubes(10 wt.%)showed the highest thermal conductivity of 0.50 W/(m K)and latent heat of 139.64 J/***,according to the leakage testing and battery charge/discharge experiments,compared with Al_(2)O_(3)and ZnO,the addition of carbon nanotubes remarkably enhances the heat storage ability as latent heat from 126.98 J/g for the prepared sample with Al_(2)O_(3)and 125.86 J/g for the one with ZnO,then to 139.64 J/g,as well as dissipation performance as a cooling effect by decreasing the sur-face temperature of battery from 2%to 12%of microcapsule,composite sample with carbon nanotubes presents a broad application prospect in battery thermal management system and energy storage field.

关键词： Microcapsule Phase change material Battery Carbon nanotube Safety

基于改进Faster R-CNN与U-Net算法的桥梁病害识别与量化方法

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东南大学学报（自然科学版） 2024年第3期54卷 627-638页

作者：乔朋梁志强段长江马晨王思龙狄谨长安大学建筑工程学院西安710061 长安大学公路学院西安710061 重庆大学土木工程学院重庆400045

为实现桥梁病害检测的自动化,对基于图像处理技术的混凝土桥梁表观病害的智能识别和尺寸确定方法展开研究.提出基于改进Faster R-CNN算法的病害识别方法,利用K均值聚类和遗传算法对区域候选网络锚框进行优化设计;以裂缝预测区域为基础,... 详细信息

为实现桥梁病害检测的自动化,对基于图像处理技术的混凝土桥梁表观病害的智能识别和尺寸确定方法展开研究.提出基于改进Faster R-CNN算法的病害识别方法,利用K均值聚类和遗传算法对区域候选网络锚框进行优化设计;以裂缝预测区域为基础,提出ResNet34结合U-Net的裂缝形态提取方法,并结合裂缝形态学研究了裂缝像素宽度和长度的确定方法.结果表明:锚框优化设计可改进Faster R-CNN算法的表观病害识别效果,5类常见病害的预测准确率、召回率、平均精确率分别由68.40%、69.87%、74.64%提升到85.40%、83.59%、83.72%;利用病害预测框,结合改进U-Net算法的裂缝像素尺寸计算,可实现裂缝病害尺寸的自动测量;基于改进Faster R-CNN和改进U-Net的方法可实现混凝土桥梁常见病害的智能识别和尺寸量化,从而提高桥梁病害检测效率并促进桥梁技术状况评定的智能化.

关键词：桥梁工程表观病害识别裂缝尺寸确定改进Faster R-CNN 改进U-Net

Allocation patterns of nonstructural carbohydrates in response to CO_(2)elevation and nitrogen deposition in Cunninghamia lanceolata saplings

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Journal of Forestry Research 2023年第1期34卷 87-98页

作者： Wenhui Zheng Renshan Li Qingpeng Yang Weidong Zhang Ke Huang Xin Guan Longchi Chen Xin Yu Qingkui wang silong wang Fujian Provincial Key Laboratory of Resources and Environmental Monitoring and Sustainable Management and Utilization Sanming UniversitySanming 365004People’s Republic of China CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyHuitong Experimental Station of Forest EcologyShenyang 110016People’s Republic of China Huitong National Research Station of Forest Ecosystem HuaihuaHuitong 418307People’s Republic of China Life Science Department Luoyang Normal UniversityLuoyang 471934People’s Republic of China Fujian Provincial Key Laboratory of the Development and Utilization of Bamboo Resources Sanming UniversitySanming 365004People’s Republic of China

Stored nonstructural carbohydrates(NSC)indicate a balance between photosynthetic carbon(C)assimilation and growth investment or loss through respiration and root *** play an important role in plant function and whole-plant level C ***_(2)elevation and nitrogen(N)deposition,which are two major environmental issues worldwide,aff ect plant photosynthetic C assimilation and C release in forest ***,information regarding the eff ect of CO_(2)elevation and N deposition on NSC storage in diff erent organs remains limited,especially regarding the trade-off between growth and NSC ***,here we analyzed the variations in the NSC storage in diff erent organs of Chinese fi r(Cunninghamia lanceolata)under CO_(2)elevation and N addition and found that NSC concentrations and contents in all organs of Chinese fi r saplings increased remarkably under CO_(2)***,N addition induced diff erential accumulation of NSC among various *** cally,N addition decreased the NSC concentrations of needles,branches,stems,and fi ne roots,but increased the NSC contents of branches and coarse *** increase in the NSC contents of roots was more pronounced than that in the NSC content of aboveground organs under CO_(2)*** role of N addition in the increase in the structural biomass of aboveground organs was greater than that in the increase in the structural biomass of *** result indicated that a diff erent tradeoff between growth and NSC storage occurred to alleviate resource limitations under CO_(2)elevation and N addition and highlights the importance of separating biomass into structural biomass and NSC reserves when investigating the eff ects of environmental change on biomass allocation.

关键词： Biomass partition CO_(2)elevation N deposition Nonstructural carbohydrates Structural biomass

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探月工程产品保证实践

质量与可靠性 2024年第1期 1-8页

作者：唐玉华范艳清田少杰金霄郭强王思龙探月与航天工程中心北京100086

结合探月工程特点及产品保证发展历程,对探月工程产品保证工作体系进行阐述,着重总结和凝练探月工程质量文化、产品保证策划、产品保证实施、产品保证监督和改进等方面的做法和经验,这些实践经验可为后续深空探测工程及其他工程产品保... 详细信息

结合探月工程特点及产品保证发展历程,对探月工程产品保证工作体系进行阐述,着重总结和凝练探月工程质量文化、产品保证策划、产品保证实施、产品保证监督和改进等方面的做法和经验,这些实践经验可为后续深空探测工程及其他工程产品保证工作的实施提供有益借鉴。

关键词：探月工程产品保证实践

Stability of soil organic carbon changes in successive rotations of Chinese fir(Cunninghamia lanceolata(Lamb.) Hook) plantations

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Journal of Environmental Sciences 2009年第3期21卷 352-359页

作者： ZHANG Jian wang silong FENG Zongwei wang Qingkui Huitong Experimental Station of Forest Ecology Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Department of Systems Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Huitong National Research Station of Forest Ecosystem Huitong 418307 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

The importance of soil organic carbon （SOC） under forests in the global carbon cycle depends on the stability of the soil carbon and its availability to soil microbial biomass. We investigated the effects of successive rotations of Chinese fir （Cunninghamia lanceolata （Lamb.） Hook） plantations on the stability of SOC and its availability to microbes by adopting the two-step hydrolysis with H2SO4 and density fractionation. The results showed that successive rotations of Chinese fir decreased the quantity of total SOC, recalcitrant fraction, and carbohydrates in Labile Pool I （LPI）, and microbial properties evidently, especially at 0-10 cm horizon. However, cellulose included in Labile Pool Ⅱ （LP Ⅱ） and the cellulose/total carbohydrates ratio increased in successive rotations of Chinese fir. The noncellulose of carbohydrates included in LPI maybe highly available to soil microbial biomass. Hence the availability of SOC to microbial biomass declined over the successive rotations. Although there was no significant change in recalcitrance of SOC over the successive rotations of Chinese fir, the percentage of heavy fraction to total SOC increased, suggesting that the degree of physical protection for SOC increased and SOC became more stable over the successive rotations. The degradation of SOC quality in successive rotation soils may be attributed to worse environmental conditions resulted from disturbance that related to ＂slash and burn＂ site preparation. Being highly correlated with soil microbial properties, the cellulose/total carbohydrates ratio as an effective indicator of changes in availability of SOC to microbial biomass brought by management practices in forest soils.

关键词： Chinese fir plantation forest soils organic carbon microbial property biochemical quality density fractionation

Comparisons of carbon storages in Cunninghamia lanceolata and Michelia macclurei plantations during a 22-year period in southern China

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Journal of Environmental Sciences 2009年第6期21卷 801-805页

作者： NIU Dong wang silong OUYANG Zhiyun State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Huitong Experimental Station of Forest Ecology Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China

Tree species composition was important for carbon storage within the same climate *** quantify the dynamics of ecosystem carbon allocation as affected by different tree species,we measured the above-and below-ground biomass accumulation in 22 years,as well as the tissue carbon concentrations of trees in Cunninghamia lanceolata plantation and Michelia macclurei *** indicated that *** plantation significantly stored more carbon（174.8 tons/hm2） than *** plantation（154.3 tons/hm2）.Most of the carbon was found in the soil pool（57.1% in *** plantation,55.2% in *** plantation）.Tree and soil component of *** plantation possessed significantly higher carbon storage than that of *** plantation（p 〈 0.05）.No significant difference was found in the carbon storage of understory and forest *** results suggest that the broadleaved species（***） possesses greater carbon sequestration potential than the coniferous species（***） in southern China.

关键词： Cunninghamia lanceolata plantation Michelia macclurei plantation carbon storage carbon allocation patterns

Real-Time H.265/HEVC Intra Encoding with a Configurable Architecture on FPGA Platform

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Chinese Journal of Electronics 2019年第5期28卷 1008-1017页

作者： DING Dandan wang silong LIU Zoe YUAN Qingshu School of Information Science and Engineering Hangzhou Normal University College of Information Science and Electronic Engineering Zhejiang University

This paper proposes a flexible design scheme for H.265/HEVC encoding based on FPGA, which allows an easy incorporation of a variety of algorithms applied to different scenarios. In particular, we present an H.265/HEVC intra encoder as an instantiation of our proposed scheme. The key idea is to develop an encoder system by configuring basic Processing elements(PEs) of fundamental algorithms. Our intra encoder using the flexible framework is structured with fourstage CTU based pipeline. Pixel-level PEs are designed to unify the intra prediction of 35 modes and a multiscale compatible transform array is proposed to process variable size transform. 32 PEs are paralleled for intra mode decision to support 35 combinations of modes and partitions. In the reconstruction stage, 16 PEs are paralleled for intra prediction and a 16 × 16 multiplier array is configured for transforms of variable sizes with a constant 16 pixels/cycle throughput. Implementation results show that our proposed architecture costs about63 K Lookup tables and 62 KB on-chip memories on Xilinx Kintex-7 platform with the maximum working frequency at 175 MHz, which is sufficient for real-time encoding of 1920 × 1080 @60 fps video at 160 MHz. The flexibility and extension capability of our framework provides a great potential for future FPGA solutions serving for different purposes.

关键词： H.265/HEVC Configuration Flexibility Intra prediction FPGA

N concentration of old leaves and twigs is more sensitive to stand density than that of young ones in Chinese fir plantations： a case study in subtropical China

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Journal of Forestry Research 2018年第1期29卷 163-169页

作者： Yuebao Di Xiaoli Fu Huimin wang Wenhua Li silong wang Qianyanzhou Ecological Research Station Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 People's Republic of China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100190 People's Republic of China Jiangxi Key Laboratory of Ecosystem Processes and Information Ji'an 343725 People's Republic of China Huitong Experimental Station of Forest Ecology Key Laboratory of Forest Ecology and Management Institute of Applied Ecology Chinese Academy of Sciences Sbenyang 110016 People' s Republic of China

Young leaves are conventionally used in the analysis to study the nutrient status of evergreen plants and their responses to environmental changes, but the role of old leaves remains poorly understood. We selected two stand types in 31-year-old Chinese fir（Cunninghamia lanceolata） plantations with similar soil conditions but different stand densities, to test the hypothesis that nitrogen（N） concentration of old leaves and twigs is more sensitive to stand density than that of young ones. Leaves and twigs were sampled and sorted into young（one-year-old） and old（two-and three-year-old） groups. Significant differences in N concentration and carbon： nitrogen ratio between the low-density stand and high-density stand were only found in the old leaves and twigs but not in the young *** the N resorption efficiency did not vary significantly with stand density, the annual N resorption rates were increased in old leaves and relatively young twigs at high stand density. These results show the potential use of old tissues in the nutrient analysis in Chinese fir plantations. Testing the generality of these results could improve the use of foliar analysis as an indicator of nutrient status and environmental changes in evergreen tree species.

关键词： Foliar analysis Twig Nitrogen Nutrient resorption Stand density

Carbon storage in evergreen broad-leaf forests in mid-subtropical region of China at four succession stages

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Journal of Forestry Research 2013年第4期24卷 677-682页

作者： ZENG Zhangquan wang silong ZHANG Canming GONG Chao HU Qing Huitong Experimental Station of Forest Ecology State Key Laboratory of Forest and Soil EcologyInstitute of Applied EcologyChinese Academy of Sciences Huitong National Research Station of Forest Ecosystem Graduate School of Chinese Academy of Sci- ences Hunan Academy of Forestry Hengshan Station of Forest Ecology Northeast Institute of Geography and Agroecology Chinese Academy of Sciences

To better understand the effect of forest succession on carbon sequestration, we investigated carbon stock and allocation of evergreen broadleaf forest, a major zonal forest in subtropical China. We sought to quantify the carbon sequestration potential. We sampled four forest types, shrub （SR）, pine （Pinus massoniana） forest （PF）, pin~ and broadleaf mixed forest （Mr） and evergreen broadleaf forest （BF）. A regression equation was constructed using tree height and diameter at breast height （DBH） and elements of total tree biomass. The equation was subse- quently utilized to estimate tree carbon storage. The carbon storage of understory, litter, and soil was also estimated.

关键词： Biomass carbon Carbon allocation Carbon sequestration Soil organic carbon China subtropical forest