检索结果-南通市图书馆

Journal of Energy Chemistry 2025年第1期100卷 621-627页

作者： Fei Lv Longjie Liu Jiazhe Wu Pengfei Wang Lixia Pan Dengwei Jing Yubin Chen international Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Combining water electrolysis and rechargeable battery technologies into a single system holds great promise for the co-production of hydrogen （H2） and ***,the design and development of such systems is still in its ***,an integrated hydrogen-oxygen （O2）-electricity co-production system featuring a bipolar membrane-assisted decoupled electrolyzer and a Na-Zn ion battery was established with sodium nickelhexacyanoferrate （NaNiHCF） and Zn2+/Zn as dual redox *** decoupled electrolyzer enables to produce H2and O2in different time and space with almost 100%Faradaic efficiency at 100 mA ***,the charged NaNiHCF and Zn electrodes after the electrolysis processes formed a Na-Zn ion battery,which can generate electricity with an average cell voltage of 1.75 V at 10 m A *** connecting Si photovoltaics with the modular electrochemical device,a well-matched solar driven system was built to convert the intermittent solar energy into hydrogen and electric energy with a solar to hydrogen-electricity efficiency of 16.7%,demonstrating the flexible storage and conversion of renewables.

关键词： Hydrogen Electricity Decoupled water electrolyzer Na-Zn ion battery Solar energy

Trees as large-scale natural phononic crystals: Simulation and experimental verification

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

international soil and water Conservation Research 2019年第2期7卷 196-202页

作者： Jiankun Huang Yifan Liu Yaguang Li Key Laboratory of State Forestry Administration on soil and water Conservation School of Soil and Water ConservationBeijing Forestry UniversityBeijingChina

Urban trees are usually planted on a periodic layout in the spatial *** regard urban trees as large-scale natural phononic *** entire forest is reduced to a reasonable 'tree-soil' unit cell based on the phononic crystal theory and finite element method by COMSOL software is used to obtain the dispersion *** Rayleigh wave band gaps of phononic trees are distinguished by the sound cone *** influences of soil elastic modulus and tree height on band gaps are investigated.A three-dimensional simulation model and experiment test are applied to validate the effect of phononic trees on vibration *** numerical frequency reduction zones coincide exactly with the theoretical band *** soil stiffness results in a higher-frequency and wider band *** increasing tree height is beneficial to obtain low-frequency band gaps.A periodically arranged plantation that Rayleigh wave band gaps at frequency ≤60 Hz could be *** study opens up a new theoretical basis for the quantitative analyses of urban trees to the ground vibration mitigation at a certain frequency range.

关键词： Urban trees Phononic crystal Dispersion curve Band gap Rayleigh wave

Dimension and frequency of bar formation in a braided river

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

international Journal of Sediment Research 2013年第3期28卷 358-367页

作者： Hsuan-pei AN Su-chin CHEN Hsun-chuan CHAN Yi HSU Department of soil and water Conservation National ChungHsing University

This paper presents flume and field observations of a bank-confined braided *** features,including plan form configuration,channel width,and main channel migration,were examined by a series of *** measurements of channel morphology,provided a basis to estimate the relationship between noncumulative frequency of bars and bar *** results from the Dajia River,located in Central Western Taiwan,were presented to provide a reference data set for comparing the laboratory and field *** results indicate that the relationship between bar length and width can be predicted by a simple best-fit power function relating to self-similarity *** Hurst index by Walsh and Hicks(2002) provides acceptable predictions of the bar length and width observed in the experiments and confirmed by the field *** and field results both show that large river width yields a uniform distribution of bar areas with the similar discharge,leading to a large value of exponent(ft) in the *** river width is confirmed to be a critical parameter in the main channel shift.A small increase in channel width likely increased rapidly the shift cycle.

关键词： Braided river Bank confinement Bar morphology

Evaluation of soil erosion from chestnut forests: A case study in the Yanshan Mountains, China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2020年第2期17卷 435-447页

作者： DING Xin-hui LIU Xiao-ying LIU Guang-quan NING Dui-hu XIE Yong-sheng HAO Xiao-dong ZHOU Wei State Key Laboratory of Simulation and Regulation of water Cycles in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100048China international Research and Training Center on Erosion and Sedimentation Beijing 100048China Institute of soil and water Conservation Chinese Academy of SciencesMinistry of Water ResourcesYangling 712100 Institute of soil and water Conservation of Chengde city Chengde 067000China

soil erosion from chestnut forests has many types and intensities. However, less attention has been paid to the increasing soil erosion in the chestnut forests of Yanshan Mountains region, North China. The objective of this study was to discuss forest ages(soil erosion types and intensities in chestnut forests. A field survey was applied to investigate in detail the contiguous chestnut forests near Changfu village of Hebei Province, China on October 9-30, 2016. Results showed that chestnut forests are dominated by moderate erosion in this region, and the soil erosionfrom chestnut forests tended to deteriorate gradually. The average land degradation index was 0.31. The erosion intensity from chestnut forests will gradually increase with the year of planting. Most of the slopes are greater than 15°, accounting for 86.7% of the total chestnut forests. Most of the chestnut forests occupy the whole slope, accounting for 47.5% of the total area. Moderate erosion occurs most commonly for different slope aspects. In conclusion, improving the preparation efficiency of chestnut forests and enhancing the construction standards of soil and water conservation measures would be useful measures to avoid soil erosion from chestnut forests reaching a more severe level.

关键词： Chestnut forest soil erosion intensity Influencing factors Erosion control measures Yanshan Mountains

维普期刊数据库

Runoff and Infiltration responses of revegetated slopes to clipping management on the northern Loess Plateau

在线全文

学校读者我要写书评

暂无评论

international soil and water Conservation Research 2024年第1期12卷 171-183页

作者： Qilin He Binbin Li Fengbao Zhang Nan Shen Mingyi Yang The Research Center of soil and water Conservation and Ecological Environment Chinese Academy of Sciences and Ministry of EducationYanglingShaanxi712100China Institute of soil and water Conservation Chinese Academy of Sciences and Ministry of Water ResourcesYanglingShaanxi712100China Institute of soil and water Conservation Northwest A&F UniversityYanglingShaanxi712100China water and soil Conservation Monitoring Center of Ministry of water Resources Beijing100053China University of Chinese Academy of Sciences Beijing100049China

Large-scale vegetation restoration can reduce local watershed water yield,limit vegetation establishment and subsequent growth,and influence regional ecosystem *** management by reducing aboveground parts of grassland was gradually recommended and adopted in Grain-for-Green project management to offset these additional ***,scientific evaluation of the effectiveness of clipping management on infiltration and runoff processes is necessary for maintaining the stability of the surface water system and the sustainability of vegetation restoration in semi-arid regions.A field simulated rainfall experiment was conducted with four managed clipping grasslands(mainly bunge needlegrass and Stipa grandis),including no clipping,light clipping,heavy clipping,and complete clipping under three slope gradients(10,20,and 30°)and three rainfall intensities(60,90,and 120 mm/h)to explore the mechanism of runoff and infiltration responses to clipping using structural equation modeling and variation partitioning based on an SCS-CN *** results showed the runoff coefficient of the light clipping,heavy clipping,and complete clipping plots were 1.33,2.22,and 4.22 times that of the no clipping *** light clipping,heavy clipping,and complete clipping plots decreased the infiltration coefficients by 0%,5%,and 26%relative to the no clipping *** intensity dominated runoff and infiltration amounts,and clipping intensity's total effect was stronger than slope *** intensity and slope gradient were more influential on runoff with increasing rainfall *** mutual inhibition effect was between clipping intensity and slope gradient on *** order to maintain the sustainability of restoration,a 25-50%vegetation coverage after clipping maximizes the benefits of increasing runoff and maintaining enough soil water supply that prevents possible soil *** propose that future vegetation restoration policies should evaluate the appropriat

关键词： Runoff Infiltration Grassland clipping management SCS-CN model Structural equation model Variation partitioning

Responses of flood peaks to land use and landscape patterns under extreme rainstorms in small catchments-A case study of the rainstorm of Typhoon Lekima in Shandong,China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

international soil and water Conservation Research 2022年第2期10卷 228-239页

作者： Yuanhao Liu Jianqiao Han Juying Jiao Baoyuan Liu Wenyan Ge Qingbin Pan Fei Wang Institute of soil and water Conservation Northwest A&F UniversityYangling712100Shaanxi ProvinceChina Key Laboratory of the Loess Plateau soil Erosion and water Loss Process and Control Ministry of Water ResourcesZhengzhou450003Henan ProvinceChina Institute of soil and water Conservation Chinese Academy of Sciences and Ministry of Water ResourcesYangling712100Shaanxi ProvinceChina China Institute of water Resources and Hydropower Resea

Investigations of the formation mechanisms of flood peaks in small catchments facilitate flood prediction and disaster prevention under extreme ***,there have been few studies on the re-sponses of flood peaks to land use landscape patterns using field surveys during extreme rainstorm *** on field data from 17 small catchments near the rainstorm center of Typhoon Lekima,7 landscape indices were *** flood peak and its sensitivity to the land use landscape were investigated by combining remote sensing interpretation and related *** conclusions are as follows:(1)The peak discharge of the small catchment was 2.36e56.50 m3/s,the peak modulus was 8.00 e48.89 m3/(s$km2),and the flood index K ranged from 3.61 to 4.55.(2)Under similar rainfall conditions,the flood peak modulus,K and the proportion of sloping cropland had significantly positive correlations(p<0.05).The flood peak modulus was significantly negatively correlated with the proportion of forest-grassland and terrace(p<0.05),and K and the proportion of forest-grassland and terraced land exhibited a negative correlation.(3)The flood peak modulus and K were positively correlated with the landscape fragmentation.(4)The sensitivities of small catchments to floods were evaluated to be moderate compared to K values from other *** ability of small catchments to cope with extreme rain-storms can be improved by increasing the areas of forest-grassland,and terraces and reducing landscape *** results could be applied to provide a basis for land use planning and support for the response against disasters caused by extreme floods.

关键词： Extreme rainstorm Flood peak intensity Flood peak sensitivity Land use Landscape pattern

Effect of shrub-grass vegetation coverage and slope gradient on runoff and sediment yield under simulated rainfall

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

international Journal of Sediment Research 2021年第1期36卷 29-37页

作者： Dandan Han Jingcheng Deng Chaojun Gu Xingmin Mu Peng Gao Jianjian Gao State Key Laboratory of soil Erosion and Dryland Agriculture on Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources University of Chinese Academy of Sciences State Key Laboratory of soil Erosion and Dryland Agriculture on Loess Plateau Northwest A&F University Yangtze River Basin Monitoring Center Station for soil and water Conservation Changjiang Water Resources Commission Suide Test Station of water and soil Conservation Yellow River Conservancy Committee of the Ministry of Water Resources

Evaluating the benefits of sediment and runoff reduction in different vegetation types is essential for studying the mechanisms of soil and water conservation on the Loess *** experiment was conducted in shrub-grass plots with nine levels of mixed vegetation coverage from 0% to 70%,three slopes(10°,15°,and 20°) and two rainfall intensities(1.0 and 2.5 mm/min).The results showed that the vegetation coverage and slope gradient significantly affect runoff and sediment ***-grass vegetation coverage had a significant effect on the runoff start-time,runoff flow velocity,runoff rate,and soil erosion rate on *** vegetation coverage could effectively delay the runoff starttime and decrease the runoff flow ***,the effects of the slope gradient on runoff and sediment yield are opposite to those of vegetation ***-grass vegetation coverage could effectively increase runoff and sediment yield reduction benefits,while their benefits were affected by the rainfall *** the 1.0 mm/min rainfall intensity,the reduction in the sediment production rate was greater than that under the 2.5 mm/min ***,when the shrub-grass vegetation coverage exceeded 42%,the runoff reduction benefit was more obvious at higher rainfall *** cumulative sediment yield increased with increasing cumulative runoff,and the rate of increase in the cumulative runoff was greater than that of the cumulative sediment yield with increasing of shrub-grass vegetation ***,there was a power function relationship between cumulative sediment yield and cumulative runoff yield(P <0.05).Our paper is expected to provide a good reference on the ecological environment and vegetation construction on the Loess Plateau.

关键词： Simulated rainfall Shrub-grass coverage Slope Runoff and sediment yield

Effects of biological soil crusts on water infiltration and evaporation Yanchi Ningxia,Maowusu Desert,China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

international Journal of Sediment Research 2016年第4期31卷 311-323页

作者： Bai Li Jiarong Gao Xiuru Wang Lan Ma Qiang Cui Maik Vest College of soil and water Conservation Beijing Forestry University CEBra-Center for Energy Technology Brandenburg Research Center on soil and water Conservation of the Ministry of water Resources Department of Sedimentation China Institute of Water Resources and Hydropower Research

Biological soil crusts serve as a vanguard for improving the ecological environment in arid,semi-arid desertification *** is a good indicator of the level of improvement which the local ecological environment is *** desert areas,water condition is a key factor of improving the ecological *** a first layer protection,biological crusts play an important role in local vegetation succession due to their abilities to conserve and maintain *** Maowusu desert in Yanchi of Ningxia province as an example,after three years of research,this paper chooses three kinds of biological crusts including lichen,moss and cyanobacterial which are under the cover of Artemisia ordosica as research *** results of this study indicate that,the closer biological crusts are to Artemisia ordosica vegetation,the thicker they *** the same position of Artemisia ordosica vegetation,the thickness of moss crusts is the highest,followed by lichen crusts,and the thickness of cyanobacterial crusts is the *** soil crusts coverage protects the natural water content of soil layers from0 to 5 ***,it effects falling water to infiltrate deeper,and cannot prevent the surface water content from evaporating *** effect of biological crusts blocking water infiltration decreases with the increase of *** the same rainfall level,moss crusts provide the strongest water infiltration blockage,followed by lichen crusts and cyanobacterial *** the increase of rainfall,the depth of water infiltration *** the same rainfall level,the relationship of water infiltration depth is as follows:cyanobacterial crusts > lichen crusts > moss *** the increase of biological crusts thickness,they blocking water infiltration capacity is stronger,and the depth of water infiltration is *** on the characteristic of simulated rainfall process on biological crusts shows that sandy land can be fixed by applying appropri

关键词： Lichen crusts Moss crusts Cyanobacterial crusts The thickness of biological crusts Simulated artificial rainfall Desertification area

Convergent evolution inspired serrated structure for improving efficiency of soil imprinting and its mechanism investigation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

international Journal of Agricultural and Biological Engineering 2019年第4期12卷 16-26页

作者： Zhihong Zhang Ying Li Jin Tong Stephen Carr College of Agriculture and Food Kunming University of Science and TechnologyKunming 650500China United States Department of Agriculture Agricultural Research Service1680 Madison Ave.WoosterOhio 44691USA The Key Laboratory of Bionic Engineering Jilin UniversityChangchun 130025China international soil and water renewables LLCSalemIndiana 47167USA

Remarkable geometrical similarities are found in digging claws of soil burrowing animals,in spite of the fact that they evolved *** on convergent evolution theory,this study innovatively proposed a bionic engineering perspective that focuses on general and analogous geometrical characteristics of soil *** was observed that soil animals with powerful burrowing ability have analogous serrated structures on their digging *** soil imprinting toothed wheel as the research object,the hypothesis that special serrated structures have the potential of reducing penetrating resistance from soil and enhancing digging efficiency for soil engaging component was *** convergent evolution inspired bionic serrated structures were utilized for the design of cutting edge on toothed ***,a toothed wheel that mounted with the conventional tooth and a bionic tooth were manufactured and tested in the soil *** showed that special bionic serrated structure could reduce the required draft force for toothed wheel;meanwhile increase the depth and volume of prepared *** was found that the soil-penetrating mechanism of the bionic toothed wheel behaved as saw cutting that similar to the digging behavior of soil burrowing *** of serrated structure has the ability to maximum stress concentrations in soil,thus increased the tendency of soil material to *** results indicate that the convergent evolution inspired bionic approach is novel and advantageous for the design of new soil engaging implements for working quality optimization and forward resistance reduction.

关键词： convergent evolution bionic serrated structure soil imprinting soil-engaging component bionic agricultural machinery

Overland flow resistance and its components for slope surfaces covered with gravel and grass

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

international soil and water Conservation Research 2022年第2期10卷 273-283页

作者： Lan Ma Chengzhong Pan Jingjing Liu Key Laboratory of State Administration of Forestry and Grassland on soil and water Conservation School of Soil and Water ConservationBeijing Forestry UniversityBeijing100083China Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology College of Water SciencesBeijing Normal UniversityBeijing100875China soil and water Conservation Monitoring Center of Haihe Basin of Haihe water Resources Commission of the Ministry of water Resources Tianjin300170China

Overland flow resistance plays an important role in predicting hillslope hydrological and erosion pro-cesses on *** surfaces covered with grass and/or gravel may increase hydraulic resistance to overland flow,but there is little information on the determination on these resistance components in a composite *** this study,the smooth and sand-bed surfaces covered with different gravel or/and grass(cover degree¼2.5%,5%,10%,15%,20%)under five slope gradients(3,6,9,12,15)were subjected to inflows to investigate the hydraulic resistance and validate the sum law of resistance *** results showed that,the overland flow mainly belonged to transition or turbulent and supercritical flow regime with 150soil and water conservation measures in the rocky and mountainous areas.

关键词： Overland flow Resistance Grass Gravel Sum law