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Wave Attenuation and Turbulence Driven by Submerged Vegetation Under Current-Wave Flow
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作者 HUANG Yu-ming Ding Lei +3 位作者 WANG Yi-fei CHEN Ben YANG Xiao-yu DOU Xi-ping 《China Ocean Engineering》 SCIE EI CSCD 2024年第4期602-611,共10页
A set of laboratory experiments are carried out to investigate the effect of following/opposing currents on wave attenuation.Rigid vegetation canopies with aligned and staggered configurations were tested under the co... A set of laboratory experiments are carried out to investigate the effect of following/opposing currents on wave attenuation.Rigid vegetation canopies with aligned and staggered configurations were tested under the condition of various regular wave heights and current velocities,with the constant water depth being 0.60 m to create the desired submerged scenarios.Results show that the vegetation-induced wave dissipation is enhanced with the increasing incident wave height.A larger velocity magnititude leads to a greater wave height attenuation for both following and opposing current conditions.Moreover,there is a strong positive linear correlation between the damping coefficientβand the relative wave height H_(0)/h,especially for pure wave conditions.For the velocity profile,the distributions of U_(min)and U_(max)show different patterns under combined wave and current.The time-averaged turbulent kinetic energy(TKE)vary little under pure wave and U_(c)=±0.05 m/s conditions.With the increase of flow velocity amplitude,the time-averaged TKE shows a particularly pronounced increase trend at the top of the canopy.The vegetation drag coefficients are obtained by a calibration approach.The empirical relations of drag coefficient with Reynolds and Keulegane-Carpenter numbers are proposed to further understand the wave-current-vegetation interaction mechanism. 展开更多
关键词 wave attenuation rigid vegetation following and opposing currents turbulent kinetic energy
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Oxidative Molecular Layer Deposition Tailoring Eco-Mimetic Nanoarchitecture to Manipulate Electromagnetic Attenuation and Self-Powered Energy Conversion 被引量:3
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作者 Jin-Cheng Shu Yan-Lan Zhang +1 位作者 Yong Qin Mao-Sheng Cao 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第9期224-237,共14页
Advanced electromagnetic devices,as the pillars of the intelligent age,are setting off a grand transformation,redefining the structure of society to present pluralism and diversity.However,the bombardment of electroma... Advanced electromagnetic devices,as the pillars of the intelligent age,are setting off a grand transformation,redefining the structure of society to present pluralism and diversity.However,the bombardment of electromagnetic radiation on society is also increasingly serious along with the growing popularity of"Big Data".Herein,drawing wisdom and inspiration from nature,an eco-mimetic nanoarchitecture is constructed for the first time,highly integrating the advantages of multiple components and structures to exhibit excellent electromagnetic response.Its electromagnetic properties and internal energy conversion can be flexibly regulated by tailoring microstructure with oxidative molecular layer deposition(oMLD),providing a new cognition to frequency-selective microwave absorption.The optimal reflection loss reaches≈−58 dB,and the absorption frequency can be shifted from high frequency to low frequency by increasing the number of oMLD cycles.Meanwhile,a novel electromagnetic absorption surface is designed to enable ultra-wideband absorption,covering almost the entire K and Ka bands.More importantly,an ingenious self-powered device is constructed using the eco-mimetic nanoarchitecture,which can convert electromagnetic radiation into electric energy for recycling.This work offers a new insight into electromagnetic protection and waste energy recycling,presenting a broad application prospect in radar stealth,information communication,aerospace engineering,etc. 展开更多
关键词 Oxidative molecular layer deposition Eco-mimetic nanoarchitecture Microwave absorption Electromagnetic attenuation Self-powered energy conversion device
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Ground-roll attenuation using modified common-offset–common-reflection-surface stacking
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作者 Seyyed Ali Fa'al Rastegar Abdolrahim Javaherian +2 位作者 Naser Keshavarz Farajkhah Mehrdad Soleimani Monfared Abbas Zarei 《Applied Geophysics》 SCIE CSCD 2016年第2期353-363,419,420,共13页
We modified the common-offset-common-reflection-surface (COCRS) method to attenuate ground roll, the coherent noise typically generated by a low-velocity, low-frequency, and high-amplitude Rayleigh wave. The COCRS o... We modified the common-offset-common-reflection-surface (COCRS) method to attenuate ground roll, the coherent noise typically generated by a low-velocity, low-frequency, and high-amplitude Rayleigh wave. The COCRS operator is based on hyperbolas, thus it fits events with hyperbolic traveltimes such as reflection events in prestack data. Conversely, ground roll is linear in the common-midpoint (CMP) and common-shot gathers and can be distinguished and attenuated by the COCRS operator. Thus, we search for the dip and curvature of the reflections in the common-shot gathers prior to the common-offset section. Because it is desirable to minimize the damage to the reflection amplitudes, we only stack the multicoverage data in the ground-roll areas. Searching the CS gathers before the CO section is another modification of the conventional COCRS stacking. We tested the proposed method using synthetic and real data sets from western Iran. The results of the ground-roll attenuation with the proposed method were compared with results of the f-k filtering and conventional COCRS stacking after f-k filtering. The results show that the proposed method attenuates the aliased and nonaliased ground roll better than the f-k filtering and conventional CRS stacking. However, the computation time was higher than other common methods such as f-k filtering. 展开更多
关键词 Common-offset-common-reflection-surface (COCRS) CRS f-k filtering ground-roll attenuation
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Measurement of Attenuation Q Value of Cylindrical Sample from Wave Energy 被引量:3
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作者 Shi Xingjue, Ye Lin, Zhao Cuiping, Li Guangquan and Li WeidongDepartment of Earth and Space Sciences, University of Science and Technology of China,Advanced Center for Earth Science and Astronomy, Third World Academy of Science, Hefei 230026, China 《Earthquake Research in China》 2000年第2期16-22,共7页
Two methods for measuring the attenuation Q value,frequency-amplitude ratio method andwaveform inversion method,were analyzed.The size and shape of most rock samples in thelaboratory can hardly fulfill the rigorous re... Two methods for measuring the attenuation Q value,frequency-amplitude ratio method andwaveform inversion method,were analyzed.The size and shape of most rock samples in thelaboratory can hardly fulfill the rigorous requirements of the above methods.A new testmethod of using the wave energy to calculate the Q value was proposed.The principle,calculation formulae and some points for attention were expounded;the relationship betweenQ_P and Q_E was discussed;and many samples were measured by this method.The result wascompared with those by other methods,and it was considered that the Q value by this methodlies between Q_P and Q_E· 展开更多
关键词 attenuation ULTRASONIC WAVE energy
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Wave Extraction and Attenuation Performance of An Edinburgh Duck Wave Energy Converter 被引量:1
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作者 ZHOU Bin-zhen LI Jia-hui +3 位作者 ZHANG Heng-ming CHEN Li-fen WANG Lei JIN Peng 《China Ocean Engineering》 SCIE EI CSCD 2021年第6期905-913,共9页
Edinburgh Duck wave energy converter(ED WEC)has excellent energy extraction performance and shows a great potential to integrate with other marine structures.This paper aims to investigate its wave energy extraction p... Edinburgh Duck wave energy converter(ED WEC)has excellent energy extraction performance and shows a great potential to integrate with other marine structures.This paper aims to investigate its wave energy extraction performance as a WEC and wave attenuation performance as a protection method for shoreline or marine structures.The wave and ED WEC interactions in regular waves are modeled using the Star-CCM+software and verified by comparisons with published experimental results.The motion response,energy conversion efficiency,and transmission coefficient of the ED WEC with different attack angles,rotation center,and incident wave heights are investigated.Results indicate that the ED WEC with an attack angle of 42°and a rotation center of 0.55 m below the mean water line can achieve both good wave energy extraction and wave attenuation performances.The wave energy extraction and wave attenuation performance of the ED WEC decrease significantly with the increase of wave nonlinearity characterized by the wave steepness.This paper can guide the practical application of the ED WEC at the early stage of design. 展开更多
关键词 Edinburgh Duck wave energy converter wave energy extraction wave attenuation wave nonlinearity
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The Time-Frequency Energy Attenuation Factor and Its Application on the Basis of Gauss Linear Frequency-Modulated Continuous Wavelet Transform
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作者 LiuXiqiang ShenPing +4 位作者 LiHong ShanChanglun JiAidong ZhangPing CaiMingjun 《Earthquake Research in China》 2004年第1期42-53,共12页
Based on the Gauss linear frequency modulated wavelet transform, a new characteristic index is presented, namely time frequency energy attenuation factor which can reflect the difference features of waveform in earthq... Based on the Gauss linear frequency modulated wavelet transform, a new characteristic index is presented, namely time frequency energy attenuation factor which can reflect the difference features of waveform in earthquake focus mechanism, wave traveling path and its attenuation characteristics in focal area or near field. In order to test its validity, we select the natural earthquakes and explosion or collapse events whose focus mechanisms vary obviously,and some natural earthquakes located at the same site or in a very small area. The study indicates that the time frequency energy attenuation factors of the natural earthquakes are obviously different with that of explosion or collapse events, and the change of the time frequency energy attenuation factors is relatively stable for the earthquakes under the normal seismicity background. Using the above mentioned method, it is expected to offer a useful criterion for strong earthquake prediction by continuous earthquake observation. 展开更多
关键词 Continuous wavelet transform Time frequency energy attenuation factor The space difference characteristics The time change characteristics
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Effect of Gamma Ray Energies and Addition of Iron Slag by weight to Portland Cements on Mass Attenuation Coefficient
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作者 Abd El-LatifAbd EI-Ghany Abd EI-LatifAhmed Khalifa S. Saeid +1 位作者 H.S. Ragab A.A. Abdalla 《材料科学与工程(中英文A版)》 2013年第12期838-842,共5页
关键词 质量衰减系数 波特兰水泥 伽玛射线 铁渣 射线能量 重量 理论计算值 γ射线谱仪
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Feasibility of Improved Attenuation Correction for SPECT Reconstruction in the Presence of Dense Materials Using Dual-Energy Virtual Monochromatic CT: A Phantom Study
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作者 Sachiko Yamada Takashi Ueguchi +4 位作者 Eku Shimosegawa Koichi Fujino Takeshi Shimazu Kenya Murase Jun Hatazawa 《Open Journal of Medical Imaging》 2015年第4期183-193,共11页
Objective: Computed tomography (CT)-based attenuation correction (CTAC) offers the clear benefit of reliable reconstruction of single-photon emission computed tomography (SPECT) images through its ability to achieve o... Objective: Computed tomography (CT)-based attenuation correction (CTAC) offers the clear benefit of reliable reconstruction of single-photon emission computed tomography (SPECT) images through its ability to achieve object-specific attenuation maps, but artifacts from dense materials often deteriorate CTAC performance. Therefore, we investigate the feasibility of CTAC in the presence of dense materials using dual-energy virtual monochromatic CT data. Methods: A sodium pertechnetate-filled cylindrical uniform phantom, with a pair of undiluted iodine syringes attached, is scanned with a dual-source CT scanner to obtain both single-energy (120 kVp) polychromatic and dual-energy (80 kVp/140 kVp with tin filtering) virtual monochromatic CT images. The single-energy and the dual-energy CT images are then converted to attenuation maps at 141 keV. SPECT images are reconstructed from 99mTc emission data of the phantom using each single-energy and dual-energy attenuation map and incorporating CTAC procedure. A region-of-in- terest analysis is performed to quantitatively compare the attenuation maps between the single-energy and the dual-energy techniques, each at an iodine-free position and a position adjacent to the iodine solutions. Results: At the iodine-free position, the phantom provides a uniform distribution of attenuation maps in both the single-energy and the dual-energy techniques. In the presence of adjacent iodine solutions, however, severe artifacts appeare in the single-energy CT images. These artifacts make attenuation values fluctuate, resulting in erroneous pixel values in the CTAC SPECT images. In contrast, dual-energy CT strongly suppresses the artifacts and hence improves the uniformity of the attenuation maps and the resultant SPECT images. Conclusions: Dual-energy CT with virtual monochromatic reconstruction has the potential to substantially reduce artifacts arising from dense materials. It has the potential to improve the accuracy of attenuation maps and the resultant CTAC SPECT images. 展开更多
关键词 SPECT attenuation Correction DUAL-energy CT VIRTUAL MONOCHROMATIC Imaging ARTIFACT Reduction
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High-precision frequency attenuation analysis and its application 被引量:9
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作者 熊晓军 贺锡雷 +2 位作者 蒲勇 贺振华 林凯 《Applied Geophysics》 SCIE CSCD 2011年第4期337-343,372,共8页
Based on seismic attenuation theory in a fluid-filled porous medium, we improve conventional methods of low-frequency shadow analysis (LFSA) and energy absorption analysis (EAA) and propose a high-precision freque... Based on seismic attenuation theory in a fluid-filled porous medium, we improve conventional methods of low-frequency shadow analysis (LFSA) and energy absorption analysis (EAA) and propose a high-precision frequency attenuation analysis technology. First, we introduce the method of three-parameter wavelet transform and the time-frequency focused criterion and develop a high-precision time-frequency analysis method based on an adaptive three-parameter wavelet transform, which has high time-frequency resolution with benefit to LFSA and can obtain a single-peaked spectrum with narrow side-lobes with benefit to EAA. Second, we correctly compute absorption coefficient by curve fitting based on the nonlinear Nelder-Mead algorithm and effectively improve EAA precision. Practical application results show that the proposed frequency attenuation analysis technology integrated with LFSA and EAA can effectively predict favorable zones of carbonate oolitic reservoir. Furthermore, reservoir prediction results based on LFSA correspond with EAA. The new technology can effectively improve reservoir prediction reliability and reduce exploration risk. 展开更多
关键词 attenuation analysis low-frequency shadow energy absorption analysis time- frequency analysis
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Wave attenuation mechanism of cross-plates applied in landslide-induced tsunami in river course 被引量:3
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作者 HUANG Bo-lin WANG Shi-chang 《Journal of Mountain Science》 SCIE CSCD 2017年第4期649-661,共13页
Since the impounding of the Three Gorges Reservoir, the channel of the Yangtze River has become a busy watercourse and the probability of landslide-induced tsunamis has increased. In the case of landslide-induced tsun... Since the impounding of the Three Gorges Reservoir, the channel of the Yangtze River has become a busy watercourse and the probability of landslide-induced tsunamis has increased. In the case of landslide-induced tsunamis in the Three Gorges Reservoir, even after shipping closures in advance, there are still facilities and objects in urgent need of protection within the risk zone of the watercourse, such as wharfs, marine fueling stations, berthed ships. The emergency protection against and decay of landslide-induced tsunamis in inland watercourses is a new challenge. In this study, 37 sets of wave decay experiments were conducted with the hydromechanics numerical method. The wave decay efficiencies of common simple structures including submerged horizontal plate, horizontal plate on the water surface, inclined thin plate and cross-plates in coastal areas were compared and analyzed. Cross-plates structure showed better wave decay capacity than other simple plates. The wave decay performance of cross-plates was related to five modes of energy dissipation and transformation, namely run-up/run-down, overtopping, reflecting, return flow and disturbed wave orbital path. The type of wave had little relation with the decay performance of cross-plates, but a strong correlation with cross-plates structure, especially the height of the vertical emerged plate. The best decay performance was observed when the ratio of wave amplitude to emerged vertical plate height was between 1 and 1.5, which can reduce up to about 8o% of the incoming wave amplitude. Finally, the emergency way of cross-plates applied to the decay of landslide-induced tsunami in river course is discussed. This study provides a conceptual reference for related studies to practice the attenuation of landslide-induced tsunami in reservoirs. 展开更多
关键词 Landslide-induced tsunami Cross-plates Wave decay energy dissipation attenuation mechanism
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Wave Attenuation and Friction Coefficient on the Coral-Reef Flat 被引量:1
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作者 朱良生 黎满球 +1 位作者 张洪生 隋世峰 《海洋工程:英文版》 EI 2004年第1期129-136,共8页
Several sets of S4 direction-wave-current-tide meters have been deployed on the coral-reef flat of Yongshu Reef in the sea area of Nansha Islands.Based on the observational sea wave data, the attenuation characterist... Several sets of S4 direction-wave-current-tide meters have been deployed on the coral-reef flat of Yongshu Reef in the sea area of Nansha Islands.Based on the observational sea wave data, the attenuation characteristics of the waves propagating on the coral reef flat, the bottom friction coefficients and the transfer of wave energy are discussed in the paper. The results show that, in the relative depths of 0.0613~0.0867, the wave height attenuation per unit distance of wave propagation is 22.09%~46.56%, with an average of 31.35%; the wave energy attenuation coefficient, 33.74%~53.22%, with an average of 43.61%. The average of the bottom friction coefficients on the coral-reef flat is 0.1346, which is about 10 times that on the sand or silt bottom. In the course of propagation on the reef flat, the waves sustain more loss in high frequency than in low frequency and the spectral energy transfers to the low frequency. These results may be used for reference in island and reef engineering. 展开更多
关键词 coral-reef flat wave attenuation wave energy transfer bottom friction
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Attenuation characteristics of impact-induced seismic wave in deep tunnels:An in situ investigation based on pendulum impact test 被引量:1
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作者 Jian Wu Quansheng Liu +5 位作者 Xiaoping Zhang Chuiyi Zhou Xin Yin Weiqiang Xie Xu Liang Jiaqi Huang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第2期494-504,共11页
The radiated seismic energy is an important index for the intensity assessment of microseismic(MS)events and the early warning of dynamic disasters.However,the energy of MS signals is significantly attenuated due to t... The radiated seismic energy is an important index for the intensity assessment of microseismic(MS)events and the early warning of dynamic disasters.However,the energy of MS signals is significantly attenuated due to the heterogeneity and viscous damping of rock media.Therefore,the study on attenuation characteristics of MS signals in underground engineering has practical significance for the accurately estimation of radiated seismic energy.Based on a pendulum impact test facility and MS monitoring system,an in situ investigation was carried out to explore attenuation characteristics at a deep tunnel.The results show that the seismic energy and peak particle velocity(PPV)attenuation are exponentially related to the propagation distance.The attenuation coefficient of energy is larger than that of PPV.With the increase in the input impact-energy,the seismic energy attenuation coefficient decreases as a power function.An empirical relationship between energy attenuation coefficient and wave impedance of rock mass was established in this scenario.Moreover,the time-frequency characteristics and energy distribution laws of impact-induced signals were investigated by the continuous wavelet transform(CWT)and wavelet packet analyses,respectively.The dominant frequency of signals decreases gradually as the propagation distance increases.Based on the energy attenuation characteristics,a new method was proposed to calculate the released source energy of MS events in the field.This study can provide an insight into energy attenuation characteristics of seismic waves and references for attenuation correction in seismic energy calculation. 展开更多
关键词 attenuation characteristics Microseismic monitoring Pendulum impact facility Seismic energy Deep tunnels
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Attenuation coefficients of gamma and X-rays passing through six materials 被引量:4
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作者 Xue-Dou Su Gao-Long Zhang +8 位作者 Shou-Ping Xu Wei-Wei Qu Lin Song Yu-Hua Huang Ben Wang Yi-Feng Wang Ze-Tao Zhang Wu-Fu Xu Ming-Li Wang 《Nuclear Science and Techniques》 SCIE CAS CSCD 2020年第1期26-31,共6页
The aim of this study was to determine the attenuation of gamma and X-rays with different energies caused by passage through different materials.To this end,different materials with a range of atomic numbers were chos... The aim of this study was to determine the attenuation of gamma and X-rays with different energies caused by passage through different materials.To this end,different materials with a range of atomic numbers were chosen to measure gamma and X-ray attenuation coefficients and to explore the mechanisms of interaction of gamma and X-rays with matter of various kinds.It is shown that the attenuation coefficients first decrease and then increase with increase in the radiation(photon)energy.The attenuation of gamma and X-rays passing through materials with high atomic number is greater than that in materials with low atomic number.The attenuation minimum is related to the atomic number of the irradiated materials.The larger the atomic number is,the lower the energy corresponding to attenuation minimum is.Photoelectric and Compton effects are the main processes when gamma rays pass through individual materials with high and low atomic numbers,respectively.Therefore,for radiotherapy and radiation protection,different methods should be considered and selected for the use of gamma and X-rays of different energies for use in different materials. 展开更多
关键词 attenuation coefficient Interaction mechanisms Gamma rays High-energy X-rays Therapy and protection
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Wave Extraction and Attenuation Performance of A Hybrid System of An Edinburgh Duck WEC and A Floating Breakwater
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作者 ZHOU Bin-zhen WANG Yu +3 位作者 ZHANG Heng-ming JIN Peng WANG Lei ZHOU Zhao-min 《China Ocean Engineering》 SCIE EI CSCD 2022年第2期167-178,共12页
Installing the Edinburgh Duck Wave Energy Converter(ED WEC)on a floating breakwater provides a potential solution to reduce costs and improve the reliability of the ED WEC.To investigate the interactions between the E... Installing the Edinburgh Duck Wave Energy Converter(ED WEC)on a floating breakwater provides a potential solution to reduce costs and improve the reliability of the ED WEC.To investigate the interactions between the ED WEC and the breakwater,a two-dimensional numerical model of a hybrid WEC-breakwater system is established based on Star-CCM+Computational Fluid Dynamics(CFD)software.The wave energy extraction performance,wave attenuation performance,and wave forces on the breakwater of the hybrid system are compared with those of the corresponding single device.The effects of the initial attack angle,the distance between the WEC and the breakwater,and the incident wave height on the pitch motion,energy conversion efficiency,transmission coefficient,and wave forces on the breakwater of the hybrid system are analyzed.The results indicate that combing the ED WEC with a breakwater can improve the energy extraction performance of the ED WEC and reduce the wave forces on the breakwater in shorter-period waves.The conversion efficiency of the hybrid system with the initial attack angle of 42°is the largest in shorter-period waves,but is reduced with the increase of initial attack angle in longer-period waves.The wave attenuation performance of the hybrid system is determined by the draft of the breakwater.The distance between the WEC and the breakwater has little effect on the hybrid system.Wave energy extraction of the ED WEC of the hybrid system decreases significantly with the increase of the incident wave height. 展开更多
关键词 Edinburgh Duck wave energy converter floating breakwater wave energy extraction wave attenuation wave nonlinearity
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Experimental Evaluation of the Attenuation Effect of a Passive Damper on a Road Vehicle Bumper
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作者 A. Agyei-Agyemang G. Y. Obeng P. Y. Andoh 《World Journal of Engineering and Technology》 2014年第3期192-200,共9页
To mitigate the degree of damage to passengers caused by automobile collisions, a friction damper was built and used in experimental tests to test its effectiveness in impact energy attenuation. The study revealed tha... To mitigate the degree of damage to passengers caused by automobile collisions, a friction damper was built and used in experimental tests to test its effectiveness in impact energy attenuation. The study revealed that energy absorption capacity of a bumper can be improved with the addition of a friction damper. The results revealed that the addition of the friction damper to an automobile bumper to give a bumper-damper system could attenuate about 32.5 % more energy than with the bumper alone. It can be concluded that the effectiveness of automobile bumpers to withstand impact of vehicles by absorbing the kinetic energy from the impact can be improved with the use of a passive friction damper. That is, a passive friction damper system could be used to attenuate more road vehicle impact energy in collisions. 展开更多
关键词 Vehicle BUMPER EQUIVALENT energy SPEED (EES) Impact attenuation Passive DAMPER
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The Experimental Measurements of Total Mass Attenuation Coefficients in Arsenic Oxide
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作者 B. Vasundhara P. Tejeswararao 《World Journal of Nuclear Science and Technology》 2016年第3期125-130,共7页
Measurements of K-shell mass attenuation coefficients are reported for the first time in Arsenic oxide (As<sub>2</sub>O<sub>3</sub>). Experiments are performed using Arsenic Oxide extended rang... Measurements of K-shell mass attenuation coefficients are reported for the first time in Arsenic oxide (As<sub>2</sub>O<sub>3</sub>). Experiments are performed using Arsenic Oxide extended range HPGe detector. To achieve measurements at many small and regular energy intervals, secondary X-ray emission technique using “Seventeen Scatters” is employed. The results are in agreement with the proposed theoretical estimates. No evidence could, however be gained in favor of microscopic theories such as RRS and EXAFS, insofar as there are no energy points within a range of 100eV on either side of the K-edge. 展开更多
关键词 Mass attenuation Arsenic Oxide K-SHELL energy Intervals
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Direct Analytical Method to Calculate Photopeak Efficiency and Photopeak Attenuation Coefficient of NaI(Tl) Well-Type Detector
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作者 K. S. Al-Mugren Mahmoud I. Abbas +1 位作者 Eman M. El-Bayoumi N. S. Aly 《World Journal of Nuclear Science and Technology》 2016年第2期115-124,共10页
In this paper full-energy peak (photopeak) efficiency and photopeak attenuation coefficient of 3'' × 3'' NaI(Tl) well-type scintillation detector were calculated using gamma-rayisotropic radiating... In this paper full-energy peak (photopeak) efficiency and photopeak attenuation coefficient of 3'' × 3'' NaI(Tl) well-type scintillation detector were calculated using gamma-rayisotropic radiating point sources (with photon energy: 0.245, 0.344, 0.662, 0.779, 0.964, 1.1732, 1.333 and 1.408 MeV) placed outside the detector well. These energies were obtained from <sup>152</sup>Eu, <sup>137</sup>Cs and <sup>60</sup>Co. The relations between the full energy peak efficiency and photopeak attenuation coefficients, were plotted vs. photon energy at different sources to detector distance, and it found that the full energy peak efficiency decreased by increasing the distance between the source and the detector. 展开更多
关键词 NaI(Tl) Well-Type Scintillation Detector Full-energy Peak Efficiency Photopeak attenuation Coefficient Gamma-Ray Point Sources
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基于变分模态分解的采空区“三带”微震信号能量衰减规律 被引量:1
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作者 贾宝新 郑克楠 周琳力 《岩土力学》 EI CAS CSCD 北大核心 2024年第4期991-1002,共12页
为探明微震信号能量在采空区“三带”结构中的衰减规律,拟开展采空区覆岩相似模型试验,采集人工激发微震波经由采空区结构传播的微震信号,通过变分模态分解(variational mode decomposition,VMD)处理微震信号,获取各频率下模态分量。针... 为探明微震信号能量在采空区“三带”结构中的衰减规律,拟开展采空区覆岩相似模型试验,采集人工激发微震波经由采空区结构传播的微震信号,通过变分模态分解(variational mode decomposition,VMD)处理微震信号,获取各频率下模态分量。针对采空区微震信号在VMD下各模态分量中心频率与能量之间的关系展开分析。根据中心频率法确定微震信号最佳模态数量,并计算微震信号欠分解状态、最佳分解状态、过分解状态下各分量能量;对各震源下信号最佳分解状态时各模态分量能量与中心频率分布关系进行拟合,分析在“三带”结构中,微震信号不同传播状态下各结构层对信号能量影响作用。研究结果表明:(1)在VMD过程中,人工激发震动信号有效模态数量在6~11范围内,微震信号能量随模态数量变化明显。(2)采用幂函数可实现对微震信号模态能量与频率关系的拟合,且拟合状态良好(决定系数大于0.9),其中低频模态分量包含能量占信号总能量近50%;采用高斯函数可以拟合震源各分量能量在频域上的分布表现,拟合状态较好,且表现出高斯单峰特征。(3)微震信号穿越采空区“三带”结构,微震信号能量随震源位置与传感器距离增加而减小,同时信号能量随震源位置到达传感器穿越岩层数量增加而减小,信号能量在经由垮落带时,能量变化明显,相较于裂隙带和弯曲下沉带,垮落带对信号能量衰减作用明显。 展开更多
关键词 变分模态分解(VMD) 微震信号 信号频率特征 信号能量衰减 采空区“三带”结构
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高铁开通对城市能源利用效率的影响机制及空间溢出效应研究
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作者 林寿富 谢艳晴 《产业经济研究》 CSSCI 北大核心 2024年第2期102-114,129,共14页
将高铁开通视为一项准自然实验,基于2006—2019年城市面板数据,运用多期双重差分法实证检验高铁开通对城市能源利用效率的影响,并进一步分析其影响机制及空间溢出效应。研究发现:(1)高铁开通对城市的能源利用效率具有显著的提升作用。(2... 将高铁开通视为一项准自然实验,基于2006—2019年城市面板数据,运用多期双重差分法实证检验高铁开通对城市能源利用效率的影响,并进一步分析其影响机制及空间溢出效应。研究发现:(1)高铁开通对城市的能源利用效率具有显著的提升作用。(2)高铁开通通过提高铁路货运效率、替代公路客运、优化产业结构及促进技术创新,提升了城市的能源利用效率。(3)高铁开通对邻近城市的能源利用效率存在正向空间溢出效应,并存在800公里的空间距离衰减边界。(4)高铁开通对城市能源利用效率的提升作用在不同区域、等级、规模、资源禀赋的城市存在显著的异质性,其中对中西部城市、小城市、普通城市、资源型城市的能源利用效率提升作用更为显著;此外,高铁开通对衰退型的资源型城市能源利用效率的促进效果最大,对成熟型的资源型城市的影响次之,但对成长型和可再生型的资源型城市不存在显著性影响。研究结论为理解高铁在能源利用效率方面的作用提供了新视角和新证据,也为实现“节能减排”和“交通强国”提供了政策启示。 展开更多
关键词 高铁 能源利用效率 多期双重差分法 空间溢出效应 衰减边界
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电池储能系统状态估计综述 被引量:1
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作者 孙玉树 龚一莼 +4 位作者 董亮 王晓晨 闫月君 唐西胜 党艳阳 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第6期2320-2333,共14页
为了提高多场景应用的技术经济性,本文对电池储能系统状态估计进行了综述。首先,分析了电池性能衰减的机理,介绍了目前常用的物理建模和数据建模方法,进而对荷电状态(state of charge,SOC)和健康状态(state of health,SOH)进行了定义与... 为了提高多场景应用的技术经济性,本文对电池储能系统状态估计进行了综述。首先,分析了电池性能衰减的机理,介绍了目前常用的物理建模和数据建模方法,进而对荷电状态(state of charge,SOC)和健康状态(state of health,SOH)进行了定义与关联性分析,并对电池及其系统的状态估计方法进行了汇总;其次,为了获取更多精确的电池运行数据,重点介绍了能够刻画电池内部演化机理的原位/非原位表征技术,进而分析了嵌入式电池管理系统(battery management system,BMS)实际应用的主流开发路线;第三,提出了基于联邦学习的电池储能系统状态估计方法,基于轻量化模型在本地进行电池储能系统SOC的估计以保证控制实时性,基于大数据驱动策略在云中心进行其SOH估计以保证容量可信度,由此实现云边的交互与协同;最后,对电池储能系统未来可能的发展方向和研究重点进行了预测。研究结果表明:活性锂损失是锂离子电池容量衰退的主要原因,高温、低温、过充放等滥用也会加速电池性能衰减;数据驱动在电池系统级建模与状态评估方面具有较大优势;利用原位/非原位表征技术可以获取更多的电池内部状态数据,基于FPGA的BMS轻量化建模更易实现,基于联邦学习的状态评估方法能够提高电池储能系统的智慧化运维水平。 展开更多
关键词 电池储能系统 性能衰减机理 状态估计 原位/非原位表征技术 轻量化BMS 联邦学习
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