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An analysis of the multi-fold method for GPR exploration 被引量:1
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作者 Wang Bangbing Tian Gang +2 位作者 Sun Bo Guo Jinxue Zhang Xiangpei 《Applied Geophysics》 SCIE CSCD 2006年第3期187-191,共5页
Multi-fold technology is widely applied in seismic exploration as a method of enhancing useful signals and suppressing noise interference to greatly increase the signal to noise ratio (S/N). The authors introduce it... Multi-fold technology is widely applied in seismic exploration as a method of enhancing useful signals and suppressing noise interference to greatly increase the signal to noise ratio (S/N). The authors introduce it to ground-penetrating radar (GPR) surveys and compare the experimental results to the conventional profiling method to demonstrate the feasibility and advantages of the technique for GPR exploration. Based on the experimental data, the authors summarize the GPR wave propagation rules and the parameters of multi- fold acquisition and processing. It is proven to be a useful attempt to enrich the GPR survey technology. 展开更多
关键词 Ground penetrating radar multi-fold and profiling mode.
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清水混凝土桥墩模板技术研究 被引量:1
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作者 吴乐 袁提提 郭锋锋 《价值工程》 2015年第25期92-94,共3页
以金沙江路真北路人行天桥新建工程桥墩施工为例,介绍了多折面异形桥墩的模板设计以及模板支撑体系设计,并对模板的制作和安装提出了要求。通过现场实践,桥墩外观质量达到了清水混凝土要求,对类似清水混凝土桥墩施工具有一定的借鉴作用。
关键词 多折面桥墩 清水混凝土 模板设计 模板运输 斜杆支撑
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A New Type Four-Fold Microstrip Hairpin Line Bandpass Filter at 1.82 GHz for TranslReceive Communication Systems
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作者 Jagdish Shivhare Shail Bala Jain 《Journal of Electrical Engineering》 2014年第2期82-85,共4页
A conventional hairpin-line resonator size is normally very large. This paper presents the design, simulation/optimization and measured results of a four-resonator multi-folded hairpin line microstrip bandpass filter ... A conventional hairpin-line resonator size is normally very large. This paper presents the design, simulation/optimization and measured results of a four-resonator multi-folded hairpin line microstrip bandpass filter at 1.82 GHz, with great reduction in size compared to the conventional hairpin line structure. In the proposed filter, the cross couplings have been realized between adjacent and non-adjacent resonators. 展开更多
关键词 Miniaturized hairpin line multi-fold resonator selectivity coupling coefficients computed response ADS software.
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Machine Learning and Pattern Analysis Identify Distinctive Influences from Long-term Weekly Net Ecosystem Exchange at Four Deciduous Woodland Locations
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作者 David A.Wood 《Research in Ecology》 2022年第4期13-38,共26页
A methodology integrating correlation,regression(MLR),machine learning(ML),and pattern analysis of long-term weekly net ecosystem exchange(NEE)datasets are applied to four deciduous broadleaf forest(DBF)sites forming ... A methodology integrating correlation,regression(MLR),machine learning(ML),and pattern analysis of long-term weekly net ecosystem exchange(NEE)datasets are applied to four deciduous broadleaf forest(DBF)sites forming part of the AmeriFlux(FLUXNET2015)database.Such analysis effectively characterizes and distinguishes those DBF sites for which long-term NEE patterns can be accurately predicted using the recorded environmental variables,from those sites cannot be so delineated.Comparisons of twelve NEE prediction models(5 MLR;7 ML),using multi-fold cross-validation analysis,reveal that support vector regression generates the most accurate and reliable predictions for each site considered,based on fits involving between 16 and 24 available environmental variables.SVR can accurately predict NEE for datasets for DBF sites US-MMS and US-MOz,but fail to reliably do so for sites CA-Cbo and MX-Tes.For the latter two sites the predicted versus recorded NEE weekly data follow a Y≠X pattern and are characterized by rapid fluctuations between low and high NEE values across leaf-on seasonal periods.Variable influences on NEE,determined by their importance to MLR and ML model solutions,identify distinctive sets of the most and least influential variables for each site studied.Such information is valuable for monitoring and modelling the likely impacts of changing climate on the ability of these sites to serve as long-term carbon sinks.The periodically oscillating NEE weekly patterns distinguished for sites CA-Cbo and MX-Tes are not readily explained in terms of the currently recorded environmental variables.More detailed analysis of the biological processes at work in the forest understory and soil at these sites are recommended to determine additional suitable variables to measure that might better explain such fluctuations. 展开更多
关键词 EDDY-COVARIANCE CO_(2)-flux influences multi-fold cross validation Weekly NEE pattern analysis Site specific NEE influences FLUXNET2015 protocols
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Concealing arbitrary objects remotely with multi-folded transformation optics 被引量:3
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作者 Bin Zheng Hamza Ahmad Madni +4 位作者 Ran Hao Xianmin Zhang Xu Liu Erping Li Hongsheng Chen 《Light(Science & Applications)》 SCIE EI CAS CSCD 2016年第1期378-386,共9页
An invisibility cloak that can hide an arbitrary object external to the cloak itself has not been devised before.In this Letter,we introduce a novel way to design a remote cloaking device that makes any object located... An invisibility cloak that can hide an arbitrary object external to the cloak itself has not been devised before.In this Letter,we introduce a novel way to design a remote cloaking device that makes any object located at a certain distance invisible.This is accomplished using multi-folded transformation optics to remotely generate a hidden region around the object that no field can penetrate and that does not disturb the far-field scattering electromagnetic field.As a result,any object in the hidden region can stay in position or move freely within that region and remain invisible.Our idea is further extended in order to design a remote illusion optics that can transform any arbitrary object into another one.Unlike other cloaking methods,this method would require no knowledge of the details of the object itself.The proposed multi-folded transformation optics will be crucial in the design of remote devices in a variety of contexts. 展开更多
关键词 multi-folded object independent remote cloaking transformation optics
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Positive Strain Rate Sensitivity and Deformation Behavior of a Fe–29Mn–3Al–3Si TWIP Steel 被引量:1
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作者 Shucheng Shen Cuilan Wu +1 位作者 Pan Xie Yuanrui Liu 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2022年第11期1825-1836,共12页
The Fe-29 Mn-3 Al-3 Si twin-induced plasticity(TWIP)steel is used to conduct quasi-static compression and dynamic impact deformation with strain rates ranging from 8.3×10^(-4) to 3800 s^(-1).The microstructures a... The Fe-29 Mn-3 Al-3 Si twin-induced plasticity(TWIP)steel is used to conduct quasi-static compression and dynamic impact deformation with strain rates ranging from 8.3×10^(-4) to 3800 s^(-1).The microstructures and properties of deformed samples under different strain rates were investigated comparatively.These results show that positive strain rate sensitivity was observed with the increase in strain rates and that there was a significant difference in strain rate sensitivity factor(m)between quasi-static compression(m=0.029)and dynamic impact deformation(m=0.190).Compared to the quasi-static compression,the dynamic impact deformation exhibited higher yield strength.Microstructural examination reveals that the primary twins were frequently found during the quasi-static compression process,and the secondary twins were rarely observed.However,the secondary and multi-fold deformation twins were florescent in the dynamic impact samples.At the initial stage of dynamic impact deformation,partial dislocations and staking faults on multiple conjugate{111}planes were simultaneously activated and produced a large number of Lomer-Cottrell dislocations,resulting in a large increase in yield strength during dynamic impact. 展开更多
关键词 TWIP steel Dynamic deformation Strain rate sensitivity multi-fold deformation twins
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