Test tools and methods for synchronizing acoustic measurements in the course of stress-strain for seafloor sediment are elaborated and the test data of 45 sediment samples from the seafloor in the South China Sea are ...Test tools and methods for synchronizing acoustic measurements in the course of stress-strain for seafloor sediment are elaborated and the test data of 45 sediment samples from the seafloor in the South China Sea are analysed. The result shows that the coarser the sediment grains are, the smaller the porosity is and the larger the unconfined compression strength is, the higher the sound velocity is. In the course of stress-strain, the sediment sound velocity varies obviously with the stress. Acoustic characteristics of sediment in different strain phases and the influence of sediment microstructure change on its sound velocity are discussed. This study will be of important significance for surveying wells of petroleum geology and evaluating the base stabilization of seafloor engineering.展开更多
Porous sound-absorbing materials were prepared from steel slag using waste expanded polystyrene（EPS） particles as pore former.The influences of the experimental conditions such as fly ash content,sintering temperatu...Porous sound-absorbing materials were prepared from steel slag using waste expanded polystyrene（EPS） particles as pore former.The influences of the experimental conditions such as fly ash content,sintering temperature,sintering time,and pore former addition on the performance of the porous sound-absorbing materials were investigated.The results show that the porosity of the specimens can reach above 50.0%;the compressive strength and average sound-adsorption coefficient of the sintered specimens are above 3.0 MPa and 0.47,respectively.The optimum preparation conditions for the steel slag porous sound-absorbing materials are as follows：mass fraction of fly ash 50%,waste EPS particles 3.6 g,sintering temperature 1100℃,and sintering time 7.5h,which are determined by considering the properties of the sound-absorbing materials,energy consumption and cost.展开更多
950641 带声场的鳀鱼流剌网的捕捞效率=The catching efficiency of the anchovy driftgill net with sound field[刊,英]//ASFAI.. -1994. 24(7). -253～254 为了提高韩国海域渔场的鳀鱼流刺网的捕捞效率,作者试验了声场的效应。试验...950641 带声场的鳀鱼流剌网的捕捞效率=The catching efficiency of the anchovy driftgill net with sound field[刊,英]//ASFAI.. -1994. 24(7). -253～254 为了提高韩国海域渔场的鳀鱼流刺网的捕捞效率,作者试验了声场的效应。试验中使用的声音是来自噪音发生器发出的噪声、信号发生器发出的纯声和研究船的水下发动机噪声。使用两组鳀鱼流刺网,观察了带发声和无发声网具的渔获差异。展开更多
基金funded by the Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences (No. MSGL0606)the China National Natural Science Fundation (Ratification No. 40876018, 40476020)
文摘Test tools and methods for synchronizing acoustic measurements in the course of stress-strain for seafloor sediment are elaborated and the test data of 45 sediment samples from the seafloor in the South China Sea are analysed. The result shows that the coarser the sediment grains are, the smaller the porosity is and the larger the unconfined compression strength is, the higher the sound velocity is. In the course of stress-strain, the sediment sound velocity varies obviously with the stress. Acoustic characteristics of sediment in different strain phases and the influence of sediment microstructure change on its sound velocity are discussed. This study will be of important significance for surveying wells of petroleum geology and evaluating the base stabilization of seafloor engineering.
基金Project(2011AA06A105)supported by the National High-tech Research and Development Program of China
文摘Porous sound-absorbing materials were prepared from steel slag using waste expanded polystyrene（EPS） particles as pore former.The influences of the experimental conditions such as fly ash content,sintering temperature,sintering time,and pore former addition on the performance of the porous sound-absorbing materials were investigated.The results show that the porosity of the specimens can reach above 50.0%;the compressive strength and average sound-adsorption coefficient of the sintered specimens are above 3.0 MPa and 0.47,respectively.The optimum preparation conditions for the steel slag porous sound-absorbing materials are as follows：mass fraction of fly ash 50%,waste EPS particles 3.6 g,sintering temperature 1100℃,and sintering time 7.5h,which are determined by considering the properties of the sound-absorbing materials,energy consumption and cost.
文摘950641 带声场的鳀鱼流剌网的捕捞效率=The catching efficiency of the anchovy driftgill net with sound field[刊,英]//ASFAI.. -1994. 24(7). -253～254 为了提高韩国海域渔场的鳀鱼流刺网的捕捞效率,作者试验了声场的效应。试验中使用的声音是来自噪音发生器发出的噪声、信号发生器发出的纯声和研究船的水下发动机噪声。使用两组鳀鱼流刺网,观察了带发声和无发声网具的渔获差异。
