检索结果-南通市图书馆

Nano Research 2024年第3期17卷 1856-1863页

作者： cheng Zhang Biyuan Zheng guangcheng Wu Xueying Liu Jiaxin Wu chengdong Yao Yizhe Wang Zilan Tang Ying chen Lizhen Fang Luying Huang Dong Li Shengman Li Anlian Pan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Materials Science and EngineeringHunan UniversityChangsha 410082China

Transition metal dichalcogenides(TMDCs)are promising candidates for future optoelectronic devices accounting for their high carrier mobility and excellent quantum efficiency.However,the limited light absorption efficiency in atomically thin layers significantly hinders photocarrier generation,thereby impairing the optoelectronic performance and hindering practical applications.Herein,we successfully synthesized In_(2)Se_(3)/WSe_(2) heterostructures through a typical two-step chemical vapor deposition(CVD)method.The In_(2)Se_(3) nanosheet with strong light absorption capability,serving as the light absorption layer,was integrated with the monolayer WSe_(2),enhancing the photosensitivity of WSe_(2) significantly.Upon laser irradiation with a wavelength of 520 nm,the In_(2)Se_(3)/WSe_(2) heterostructure device shows an ultrahigh photoresponsivity with a value as high as 2333.5 A/W and a remarkable detectivity reaching up to 6.7×10^(12) Jones,which is the highest among almost the reported TMDCs-based heterostructures grown via CVD even some fabricated by mechanical exfoliation(ME).Combing the advantages of CVD method such as large scale,high yield,and clean interface,the In_(2)Se_(3)/WSe_(2) heterostructures would provide a novel path for future high-performance optoelectronic device.

关键词： transition metal dichalcogenides(TMDCs) In_(2)Se_(3) heterostructure photodetector ultrahigh responsivity

Diversity and abundance of mangrove fiddle crabs, genus Uca(Decapoda, Ocypodidae) at a mangrove in Kema,North Sulawesi, Indonesia

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2018年第12期37卷 92-96页

作者： RIANTA Pratiwi ERNAWATI Widyastuti chen guangcheng chen Shunyang Research Center for Oceanography Indonesian Institute of Sciences Third Institute of Oceanography Ministry of Natural Resources

Mangrove ecosystems are sites with high biodiversity of benthic fauna, and fiddler crabs(genus Uca) are common benthic fauna in mangroves. The North Sulawesi in Indonesia has a good condition of mangrove while the information of the fiddler crabs is still limited. Manual samplings were conducted in wet, dry and transient seasons at a mangrove in Kema, North Sulawesi to investigate the species composition, density and distribution pattern of fiddler crabs. A total of 168 individuals, subjected to eight species of genus Uca crabs were collected at the mangrove, with U. triangularis having the highest abundance and U. annulipes having the lowest abundance.The densities of fiddle crabs were 27.56 ind./m2, 32.89 ind./m2and 14.22 ind./m2at the seaward, middle and landward zones, respectively, and the density was higher in dry and wet seasons than in transient season.

关键词： Crustacea genus Uca species mangrove North Sulawesi Indonesia

基于能量转化原理的地铁板式轨道自密实混凝土本构行为

在线全文

学校读者我要写书评

暂无评论

振动与冲击 2024年第4期43卷 190-198,214页

作者：陈俊豪曾晓辉谢友均龙广成唐卓中南大学土木工程学院长沙410075

为了掌握地铁板式轨道充填层自密实混凝土(self-compacting concrete,SCC)在车辆荷载作用下的本构行为,通过对SCC进行单轴抗压试验,研究了不同应变率、橡胶掺量和尺寸对力学性能和能量演化规律的影响,建立了SCC的本构模型。结果表明:峰... 详细信息

为了掌握地铁板式轨道充填层自密实混凝土(self-compacting concrete,SCC)在车辆荷载作用下的本构行为,通过对SCC进行单轴抗压试验,研究了不同应变率、橡胶掺量和尺寸对力学性能和能量演化规律的影响,建立了SCC的本构模型。结果表明:峰值应力的应变率敏感系数绝对值最大,弹性模量次之,峰值应变最小;橡胶延缓了能量的早期增长,而在峰值应力之后,橡胶则阻碍了弹性应变能的耗散,延长了总应变能和耗散能的快速增长;应变率越大,总应变能和耗散能增长越快,弹性应变能在峰值应力前的积累速率越快,峰值应力后的释放速率越快;建立的本构模型可以用于描述SCC在不同应变率条件下的应力-应变关系。

关键词：板式轨道自密实混凝土(SCC) 应变率力学性能能量演化本构模型

Effects of different types of nutrient effluent from shrimp ponds on the seedling growth of Kandelia obovata

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2018年第6期37卷 112-120页

作者： TIAN Yuan chen guangcheng TANG Feilong ZHENG Chunfang YE Yong Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem College of the Environment and Ecology Xiamen University Xiamen 361102 China Third Institute of Oceanography State Oceanic Administration Xiamen 361005 China Zhejiang Key Laboratory of Exploitation and Preservation of Coastal Bio-resource Zhejiang Mariculture Research Institute Wenzhou 325005 China

Extensive shrimp ponds are located next to the landward edges of most of mangrove forests in China. A shrimp pond may influence mangroves by（1） routine effluent between pond and tide, and（2） dredging effluent from pond-dredging at least once a year. Our study consisted of two experiments to study the effects of these two effluents on the seedling growth of Kandelia obovata. One experiment simulated the effects of routine effluents.The other simulated four sedimentation thicknesses（0 cm, 2 cm, 4 cm, 8 cm） over mangrove soils by dredging effluent from pond-dredging, and revealed the cumulative effects of dredging effluents on K. obovata. At each of the three fixed salinities, i.e., 5, 15 and 25, routine effluent did not result in significant differences in each of the measured growth parameters of K. obovata seedlings. However, effects of dredging effluent on seedling growth of K. obovata were related with sedimentation thickness. Most growth parameters showed maximum values at sedimentation thickness 4 cm. The data indicated that K. obovata accelerated its growth under moderate sedimentation thicknesses and it was tolerant and adaptable to shrimp pond-cleaning effluent sediments up to about 8 cm in our experiment.

关键词： routine effluent dredging effluent shrimp pond excessive nutrients biomass allocation mangroves

Ecosystem carbon stock of a tropical mangrove forest in North Sulawesi, Indonesia

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2018年第12期37卷 85-91页

作者： chen Shunyang chen Bin SASTROSUWONDO Pramudji DHARMAWAN I Wayan Eka OU Danyun YIN Xijie YU Weiwei chen guangcheng Third Institute of Oceanography Ministry of Natural Resources Research Center for Oceanography Indonesian Institute of Sciences Technical Implementing Unit Marine Life Conservation Biak Indonesian Institute of Sciences

Recent studies have highlighted the valuable role played by mangrove forests in carbon sequestration and storage.Although Indonesia accounts for a large proportion of global mangrove area, knowledge on the carbon stock and sources in the Indonesian mangrove is still limited. In this study, we quantified the ecosystem organic carbon(OC) stock and its spatial variation at an oceanic mangrove in Wori, North Sulawesi, Indonesia. The sources of soil OC were also investigated. The results showed that the mangrove soil had a substantial OC stock containing15.4 kg/m2(calculated by carbon) in the top 50 cm soil, and represented the majority of the ecosystem OC stock at the Wori mangrove. The mangrove biomass and ecosystem OC stock were 8.3 kg/m2and 23.7 kg/m2, respectively.There was no significantly difference in the soil OC stock among the stations with difference distances offshore,while the highest mangrove biomass OC stock was found at the seaward station. Isotope mixing calculations showed that the rich OC in mangrove soils was attributed to the accumulated autochthonous mangrove source while the suspended organic matter in tidal water and the mangrove-adjacent seagrass contributed less than 20%to the soil OC. The results further demonstrated the importances of the oceanic mangrove in carbon storage and the mangrove plants in contributing OC to their soils.

关键词： mangrove carbon stock biomass soil stable isotopes Indonesia

Carbon Sources of Sediment and Epifaunal Food Sources in a Tropical Mangrove Forest in North Sulawesi, Indonesia

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2020年第5期19卷 1169-1176页

作者： WU Zhiqiang XIE Limei chen Bin DHAMAWAN I Wayan Eka SASTROSUWONDO Pramudji chen Shunyang RIANTA Pratiwi ERNAWATI Widyastuti chen guangcheng College of Marine Life Sciences Ocean University of ChinaQingdao 266000China Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Research Center for Oceanography Indonesian Institute of SciencesJakarta 11048Indonesia Observation and Research Station of Coastal Wetland Ecosystem in Beibu Bay Ministry of Natural ResourcesBeihai 536015China

The stable isotope ratios of nitrogen(δ^(15)N) and carbon(δ^(13)C) were applied in this study to analyze sediment carbon sources and primary food sources of epifauna in an oceanic mangrove forest in tropical North Sulawesi, Indonesia. Proportional contribution of mangrove-derived carbon to the food sources was compared among epifauna belonging to different feeding guilds. The sediment in the mangrove site with a depleted δ^(13)C signature(-28.02‰± 0.24‰) mainly consists of mangrove-derived carbon. Analysis using Bayesian stable isotope mixing model in the R program shows that mangrove-derived carbon can dominate the food sources of a majority of the epifauna(11 out of the total 18 species), especially 2 sesarmid crabs Parasesarma semperi and Sesarma sp., crab Epixanthus dentatus, and snails Terebralia sulcata and Optediceros breviculum, which belong to various feeding guilds. Mangrove-derived carbon has a proportional contribution to the food sources of fiddle crab Tubuca coarctata and 3 littorinid snails(Littoraria spp.) close to that of suspended particulate organic matter. Three planktophagous bivalve species(Anadara antiquata, Anadara sp. and Callista erycina) were found to mainly feed on seagrass-derived materials. Mean proportional contributions of mangrove-derived carbon to the food sources were 50.15%, 59.60%, 46.20% and 27.58% for the carnivorous, omnivorous, phytophagous and planktophagous groups, respectively. The results suggest that mangrove-derived carbon can directly(via grazing plant tissues) or indirectly(via deposit feedings) make an important contribution to the food sources of epifauna in the oceanic mangrove forest where the allochthonous input of organic carbon is low.

关键词： epifauna stable isotope carbon nitrogen sediment feeding guilds

在线全文

学校读者我要写书评

暂无评论

多重谐振水泥基声子晶体带隙特性研究

材料导报 2024年第12期38卷 90-98页

作者：陈俊豪曾晓辉谢友均龙广成唐卓中南大学土木工程学院长沙410000

为了拓宽混凝土超材料弹性波衰减带的范围,本工作基于局域共振理论提出了一种多重谐振水泥基声子晶体。利用有限元方法,计算了多重谐振水泥基声子晶体的能带结构、本征模态和衰减特性,研究了带隙产生机理和影响因素,根据质量-弹簧系统... 详细信息

为了拓宽混凝土超材料弹性波衰减带的范围,本工作基于局域共振理论提出了一种多重谐振水泥基声子晶体。利用有限元方法,计算了多重谐振水泥基声子晶体的能带结构、本征模态和衰减特性,研究了带隙产生机理和影响因素,根据质量-弹簧系统推导了带隙估计式,分析了混凝土超材料充填层结构的减振性能。结果表明:多重谐振水泥基声子晶体在1~400 Hz频段内具有两个带隙,其中带隙的起始和截止频率由散射体Ⅰ、散射体Ⅱ和水泥砂浆基体的振动模式决定;包裹层的弹性模量、泊松比以及厚度是影响带隙的主要因素;由多重谐振水泥基声子晶体组成的混凝土超材料充填层结构在1~400 Hz频段内的加速度级均小于普通自密实混凝土充填层结构,特别是在带隙频段范围内振动降低了6~9 dB。

关键词：混凝土超材料局域共振多重谐振声子晶体带隙减振性能

在线全文

学校读者我要写书评

暂无评论

基于瞬态有限元的齿轮箱迷宫密封泄漏研究

润滑与密封 2024年第3期49卷 24-34页

作者：陈子昂范静园沈龙江胡玉梅杨光程重庆大学机械与运载工程学院重庆400030 中车株洲电力机车有限公司湖南株洲412001

针对某高速列车齿轮箱迷宫密封的润滑油泄漏问题,基于ANSA软件建立齿轮箱及迷宫密封结构的有限元模型,并采用FLUENT软件对其进行多相流瞬态仿真分析,研究迷宫密封结构的相对啮合深度、节流齿厚、径向间隙、回油孔直径及个数、齿与台阶... 详细信息

针对某高速列车齿轮箱迷宫密封的润滑油泄漏问题,基于ANSA软件建立齿轮箱及迷宫密封结构的有限元模型,并采用FLUENT软件对其进行多相流瞬态仿真分析,研究迷宫密封结构的相对啮合深度、节流齿厚、径向间隙、回油孔直径及个数、齿与台阶距离、齿宽、密封间隙对润滑油泄漏量的影响。结果表明:当相对啮合深度大于0.5时,润滑油泄漏量与相对啮合深度呈负相关;润滑油泄漏量与节流齿厚、回油孔直径、回油孔数量呈负相关;润滑油泄漏量与径向间隙、齿宽、齿与台阶距离、密封间隙呈正相关。根据研究结果对迷宫密封结构进行改进,改进后的迷宫密封结构润滑油泄漏量降低为原始泄漏量的3.6%。

关键词：迷宫密封泄漏量齿轮箱结构改进飞溅润滑

Biomass accumulation and organic carbon stocks of Kandelia obovata mangrove vegetation under different simulated sea levels

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2022年第8期41卷 78-86页

作者： Jiahui chen Min Gao guangcheng chen Heng Zhu Yong Ye Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems College of the Environment and EcologyXiamen UniversityXiamen 361102China Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Fujian Provincial Station for Field Observation and Research of Island and Costal Zone in Zhangzhou Xiamen 361005China

Mangrove forests are vulnerably threatened by sea level rise(SLR).Vegetation organic carbon(OC)stocks are important for mangrove ecosystem carbon cycle.It is critical to understand how SLR affects vegetation OC stocks for evaluating mangrove blue carbon budget and global climate change.In this study,biomass accumulation and OC stocks of mangrove vegetation were compared among three 10 year-old Kandelia obovata(a common species in China)mangrove forests under three intertidal elevations through species-specific allometric equations.This study simulated mangrove forests with SLR values of 0 cm,40 cm and 80 cm,respectively,representing for the current,future~100 a and future~200 a SLR of mangrove forests along the Jiulong River Estuary,China.SLR directly decreased mangrove individual density and inhibited the growth of mangrove vegetation.The total vegetation biomasses were(12.86±0.95)kg/m^2,(7.97±0.90)kg/m^2 and(3.89±0.63)kg/m^2 at Sites SLR 0 cm,SLR40 cm and SLR 80 cm,respectively.The total vegetation OC stock decreased by approximately 3.85 kg/m^2(in terms of C)from Site SLR 0 cm to Site SLR 80 cm.Significantly lower vegetation biomass and OC stock of various components(stem,branch,leaf and root)were found at Site SLR 80 cm.Annual increments of vegetation biomass and OC stock also decreased with SLR increase.Moreover,significant lower sedimentation rate was found at Site SLR 80 cm.These indicated that SLR will decrease mangrove vegetation biomass and OC stock,which may reduce global blue carbon sink by mangroves,exacerbate global warming and give positive feedback to SLR.

关键词： sea level rise vegetation biomass organic carbon stock component mangrove forest Kandelia obovata

磷肥减量与有机替代对露地辣椒产量品质及土壤肥力的影响

在线全文

学校读者我要写书评

暂无评论

农业环境科学学报 2024年第3期43卷 617-626页

作者：廖广丞陈晓萍余烨颖曹雪仙陈文伟王远帆高闻哲李廷强浙江大学环境与资源学院农业化学研究所杭州310012 浙江省天台县农业技术推广总站浙江台州317200

为制定长期高氮高磷投入背景下浙江省露地辣椒产区减肥增效方案,本研究采用田间试验探究了化学磷肥减量与有机肥替代对露地辣椒产量品质及土壤肥力的影响。试验以“萧新系列”辣椒为材料,设置5个处理:不施肥对照(CK)、常规施肥(CF)、化... 详细信息

为制定长期高氮高磷投入背景下浙江省露地辣椒产区减肥增效方案,本研究采用田间试验探究了化学磷肥减量与有机肥替代对露地辣椒产量品质及土壤肥力的影响。试验以“萧新系列”辣椒为材料,设置5个处理:不施肥对照(CK)、常规施肥(CF)、化学磷肥减量30%(OF)、化学磷肥减量30%+有机肥替代15%化肥氮(OF-15N)、化学磷肥减量30%+有机肥替代30%化肥氮(OF-30N)。结果表明:OF、OF-15N和OF-30N处理较CF处理产量分别提高3.20%、14.59%和12.21%,扣除肥料成本的效益分别提高3.37%、15.21%和12.84%;与CF处理相比,OF、OF-15N和OF-30N处理辣椒糖酸比提高0.50~2.28,改善辣椒可溶性糖、糖酸比等营养品质指标,尤其在提高钙、镁、铁、锌等中微量元素含量方面效果显著,且OF-15N和OF-30N处理产量品质提升效果优于OF处理;相较于CF处理,OF、OF-15N和OF-30N处理的土壤pH值、土壤有机质和全氮均有不同程度的提升,而土壤有效磷供应水平并未显著下降;与试验前相比,OF、CF和CK处理土壤综合肥力指数值(IFI)有所下降,而OF-15N和OF-30N处理的IFI均有所提升,且OF-30N处理的提升效果优于OF-15N处理。综合来看,在化学磷肥减量30%的基础上,通过有机肥替代30%化肥氮处理对露地辣椒产量品质及土壤肥力的提升效果显著,可作为露地辣椒的减肥增效方案。

关键词：磷肥减量有机肥替代露地辣椒产量品质土壤肥力