標(biāo)題: Titlebook: Bottom-Interacting Ocean Acoustics; William A. Kuperman,Finn B. Jensen Book 1980 Springer Science+Business Media New York 1980 Ocean.acous [打印本頁] 作者: 誤解 時(shí)間: 2025-3-21 16:18
書目名稱Bottom-Interacting Ocean Acoustics影響因子(影響力)
作者: monologue 時(shí)間: 2025-3-21 21:21 作者: 敵手 時(shí)間: 2025-3-22 02:44
Alexander A. Prokopenko,Douglas F. Williamsment of the fluid relative to the solid frame. Both losses can be included in the Biot theory for sound propagation in porous media. This theory gives an attenuation coefficient for the frictional loss that is proportional to the frequency, f, and, a viscous attenuation increasing as f. at low frequ作者: Intercept 時(shí)間: 2025-3-22 05:40
Alexander A. Prokopenko,Douglas F. Williamsr. Knowledge of these properties enables one to derive the complex reflection factor under arbitrary angles of incidence, which is an important quantity in modelling sound propagation. Though preference has been given to all methods that operate remotely, no successful breakthrough has yet been achi作者: 水獺 時(shí)間: 2025-3-22 09:23 作者: 殖民地 時(shí)間: 2025-3-22 13:18 作者: bacteria 時(shí)間: 2025-3-22 19:50
Alexander A. Prokopenko,Douglas F. Williamsown to a depth of about 70 m below the sediment surface. Several different structures due to high gas contents are described and explained for the first time in the northern Adriatic. They range from the so-called “basin effect” and cone-like structures to acoustic voids. Gas seeping from the bottom作者: THROB 時(shí)間: 2025-3-23 00:34
Characteristics of World Leadershipities from the echosounder returns, sidescan sonar and sub-bottom profiling, supplemented by surface samples and cores, are compared. The reflection intensities are integrated from the echoes of the top 75 cm of sediment. The instrument is very sensitive to slight changes in the composition of muds 作者: 誘騙 時(shí)間: 2025-3-23 01:40
Characteristics of World Leadershiptions from the Southeast Asian shelves and marginal basins. The velocity functions are least-squares regressions of the form V = V. + Kt, where t is one-way vertical travel-time to layer mid-points. The value of K shows surprisingly little variability on the shelves and adjoining basins from the Bay作者: 異教徒 時(shí)間: 2025-3-23 09:09
Characteristics of World Leadershippic. Physical models have been developed and refined which can both explain the observations and serve as a basis for predictions. Examples will be presented which contrast values determined from the physical models with measured data in order to identify problem areas and to recommend directions fo作者: EXUDE 時(shí)間: 2025-3-23 11:47
Characteristics of World Leadershiplt in higher propagation losses in shallow water than are usually expected. Two frequently observed cases have been studied, one where the bottom can propagate shear waves and another where the bottom is covered by a layer of soft unconsolidated sediments. The first case causes a low-frequency atten作者: 催眠 時(shí)間: 2025-3-23 16:35
A High-Efficiency Quantum Memory,austic which is formed due to a positive gradient in the sediment. The bottom profile can then be obtained from equations, derived using the WKB approximation, which relate the parameters of the water-bottom profile to the caustic range and source/receiver heights. Using an existing result, the theo作者: 相一致 時(shí)間: 2025-3-23 22:03 作者: 秘傳 時(shí)間: 2025-3-23 22:35 作者: Munificent 時(shí)間: 2025-3-24 06:16
,Principles of?Quantum Memories,determined from measured propagation loss of the first, second, and third bottom bounce paths over a range of grazing angles from 5° to 75°, and for a number of 1/3 octave bands from 40 Hz to 600 Hz. At these low frequencies the bottom loss versus grazing angle indicates a critical angle behaviour, 作者: SOB 時(shí)間: 2025-3-24 10:01 作者: Affluence 時(shí)間: 2025-3-24 11:49
https://doi.org/10.1007/978-981-19-7939-2t of signals arriving at the receiver via predominantly bottom bounce paths. To reach a point where the merits of such systems could be delineated with confidence or contributions to their conception could be made, it was first necessary to have a believable theoretical model capable of predicting t作者: 有抱負(fù)者 時(shí)間: 2025-3-24 16:27 作者: 施舍 時(shí)間: 2025-3-24 21:19
https://doi.org/10.1007/978-981-19-7939-2trolled conditions, (Muir, Horton, and Thompson. J. Sound & Vibration, ., June 1979). In order to contribute to the understanding of the physical basis of the penetration of sound across the boundary, a model experiment was devised at a frequency of about 1 Mhz, using two non-mixing liquids. This pa作者: 使絕緣 時(shí)間: 2025-3-25 02:45
A High-Efficiency Quantum Memory, TNT at the sea bottom provided the seismic source. 3-component seismometers were set up at distances between 0.8 and 1.7 km from the source. The seismic signal was transmitted by radio to the recording ship. An elastic wave with a propagation velocity of 111 m/s was detected. The hodograph shows a 作者: committed 時(shí)間: 2025-3-25 03:39 作者: myriad 時(shí)間: 2025-3-25 08:16
Characteristics of World LeadershipThe marine geologist/geophysicist’s principal tools for studying the seafloor are acoustic. The first major increase in understanding the seafloor following the original Challeger Expedition came in the 1950’s with the routine application of precision echo sounding techniques from research vessels.作者: motor-unit 時(shí)間: 2025-3-25 13:11
Circular Structures Observed in the Deep Sea by the Swathmap Long-Range Sidescan SonarThe marine geologist/geophysicist’s principal tools for studying the seafloor are acoustic. The first major increase in understanding the seafloor following the original Challeger Expedition came in the 1950’s with the routine application of precision echo sounding techniques from research vessels.作者: Terrace 時(shí)間: 2025-3-25 16:04
Nato Conference Serieshttp://image.papertrans.cn/b/image/189954.jpg作者: rectum 時(shí)間: 2025-3-25 22:27
Characteristics of World Leadershippic. Physical models have been developed and refined which can both explain the observations and serve as a basis for predictions. Examples will be presented which contrast values determined from the physical models with measured data in order to identify problem areas and to recommend directions for future efforts.作者: groggy 時(shí)間: 2025-3-26 03:19 作者: 可能性 時(shí)間: 2025-3-26 05:41
Directivity and Radiation Impedance of a Transducer Embedded in a Lossy Mediumr. Knowledge of these properties enables one to derive the complex reflection factor under arbitrary angles of incidence, which is an important quantity in modelling sound propagation. Though preference has been given to all methods that operate remotely, no successful breakthrough has yet been achi作者: PARA 時(shí)間: 2025-3-26 12:26
Elastic Properties Related to Depth of Burial, Strontium Content and Age, and Diagenetic Stage in Pelimestone sequence from DSDP Site 289 are viewed in light of its present depth of burial, sediment age and diagenetic stage..Changes in the elastic properties with increasing depth are more or less systematic; in general, p, V., V., A. and A. increase and a decreases. In certain cases, the depths at作者: Carminative 時(shí)間: 2025-3-26 12:52
Application of Geophysical Methods and Equipment to Explore the Sea Bottomottom, and then returning into the water to the detecting sensors. The exploration for hydrocarbons usually requires deep penetration by application of low frequencies (between 5 and 150 Hz) and does not need detailed information about the sea bottom. Increased frequencies lead to higher resolution 作者: Lobotomy 時(shí)間: 2025-3-26 19:01
The Acoustic Response of Some Gas-Charged Sediments in the Northern Adriatic Seaown to a depth of about 70 m below the sediment surface. Several different structures due to high gas contents are described and explained for the first time in the northern Adriatic. They range from the so-called “basin effect” and cone-like structures to acoustic voids. Gas seeping from the bottom作者: Creatinine-Test 時(shí)間: 2025-3-26 21:07 作者: 被詛咒的人 時(shí)間: 2025-3-27 04:34
Results and Methods Used to Determine the Acoustic Properties of the Southeast Asian Marginstions from the Southeast Asian shelves and marginal basins. The velocity functions are least-squares regressions of the form V = V. + Kt, where t is one-way vertical travel-time to layer mid-points. The value of K shows surprisingly little variability on the shelves and adjoining basins from the Bay作者: 動脈 時(shí)間: 2025-3-27 05:54 作者: 乞丐 時(shí)間: 2025-3-27 10:53
Some Bottom-Reflection Loss Anomalies near Grazing and Their Effect on Propagation in Shallow Waterlt in higher propagation losses in shallow water than are usually expected. Two frequently observed cases have been studied, one where the bottom can propagate shear waves and another where the bottom is covered by a layer of soft unconsolidated sediments. The first case causes a low-frequency atten作者: CLEFT 時(shí)間: 2025-3-27 14:44 作者: harmony 時(shí)間: 2025-3-27 18:32
Inference of Geo-Acoustic Parameters from Bottom-Loss Dataather than bottom-reflected path. The loss along this path, assuming a constant gradient, g, and attenuation, α, in the sediment is proportional to the ratio α/g. Assuming that α varies linearly with frequency, the shallow angle loss appears to increase linearly with both grazing angle and frequency作者: 扔掉掐死你 時(shí)間: 2025-3-27 23:34 作者: spinal-stenosis 時(shí)間: 2025-3-28 05:30
Low Frequency Bottom Reflectivity Measurements in the Tufts Abyssal Plaindetermined from measured propagation loss of the first, second, and third bottom bounce paths over a range of grazing angles from 5° to 75°, and for a number of 1/3 octave bands from 40 Hz to 600 Hz. At these low frequencies the bottom loss versus grazing angle indicates a critical angle behaviour, 作者: 混合 時(shí)間: 2025-3-28 07:01 作者: 郊外 時(shí)間: 2025-3-28 11:42
Comparison of Synthetic and Experimental Bottom Interactive Waveformst of signals arriving at the receiver via predominantly bottom bounce paths. To reach a point where the merits of such systems could be delineated with confidence or contributions to their conception could be made, it was first necessary to have a believable theoretical model capable of predicting t作者: ciliary-body 時(shí)間: 2025-3-28 16:09 作者: TERRA 時(shí)間: 2025-3-28 19:54 作者: FAST 時(shí)間: 2025-3-29 00:24 作者: Complement 時(shí)間: 2025-3-29 05:59
Book 1980PROPERTIES OF MARINE SEDIMENTS Attenuation of Sound in Marine Sediments . ? 1 J. M. Hovem Directivity and Radiation Impedance of a Transducer 15 Embedded in a Lossy Medium . ?? ?????? G. H. Ziehm Elastic Properties Related to Depth of Burial, Strontium Content and Age, and Diagenetic Stage in Pelagi作者: 神秘 時(shí)間: 2025-3-29 09:29
OACOUSTIC PROPERTIES OF MARINE SEDIMENTS Attenuation of Sound in Marine Sediments . ? 1 J. M. Hovem Directivity and Radiation Impedance of a Transducer 15 Embedded in a Lossy Medium . ?? ?????? G. H. Ziehm Elastic Properties Related to Depth of Burial, Strontium Content and Age, and Diagenetic Stage in Pelagi978-1-4684-9053-4978-1-4684-9051-0作者: PHAG 時(shí)間: 2025-3-29 11:29 作者: 使?jié)M足 時(shí)間: 2025-3-29 18:20
Alexander A. Prokopenko,Douglas F. Williamsan appropriate shipborne in-situ measurement method. A prerequisite for such a development is the detailed knowledge of the relationship between the specific complex acoustic data of the sediment and the radiation impedance of the transducer. An analytical treatment of this problem is rather complic作者: 處理 時(shí)間: 2025-3-29 20:50
Characteristics of World Leadershipeflection intensities, the sediment distribution in the area as well as their relations to the physical parameters of the sediments can be deduced. The sub-bottom profiler (Uniboom) has better resolution in harder sediments than the echosounder and furnishes the spatial distribution of the lithologi作者: 圓木可阻礙 時(shí)間: 2025-3-30 00:42 作者: incisive 時(shí)間: 2025-3-30 08:06 作者: 同時(shí)發(fā)生 時(shí)間: 2025-3-30 11:33 作者: Indent 時(shí)間: 2025-3-30 15:50 作者: Anthology 時(shí)間: 2025-3-30 18:31 作者: 易于 時(shí)間: 2025-3-30 22:22
Results and Methods Used to Determine the Acoustic Properties of the Southeast Asian Margins layer mid-points. More than 30 high-resolution velocity inversions from the Southeast Asian shelf data have been compiled to yield 5 average seafloor velocity gradients. Gradients predicted from statistically derived functions, based on refraction solutions from relatively thick layers, are not in 作者: 注意到 時(shí)間: 2025-3-31 02:23 作者: Dungeon 時(shí)間: 2025-3-31 05:30
Alexander A. Prokopenko,Douglas F. Williamsntent of pelagic carbonates varies inversely with sediment age. It is shown that in addition to the present depth of burial the sediment age is a useful parameter for proposing geoacoustic models of the pelagic carbonate sequences.作者: 灰心喪氣 時(shí)間: 2025-3-31 12:05
,Principles of?Quantum Memories,, and the frequency characteristics of the target. The estimates of attenuation tend to be lower than those obtained by other workers using samples and in situ probes, but this may be due to the depth of burial.作者: PIZZA 時(shí)間: 2025-3-31 14:00 作者: 學(xué)術(shù)討論會 時(shí)間: 2025-3-31 21:25
Elastic Properties Related to Depth of Burial, Strontium Content and Age, and Diagenetic Stage in Pentent of pelagic carbonates varies inversely with sediment age. It is shown that in addition to the present depth of burial the sediment age is a useful parameter for proposing geoacoustic models of the pelagic carbonate sequences.作者: 毛細(xì)血管 時(shí)間: 2025-4-1 01:23
Attenuation Estimates from High Resolution Subbottom Profiler Echoes, and the frequency characteristics of the target. The estimates of attenuation tend to be lower than those obtained by other workers using samples and in situ probes, but this may be due to the depth of burial.作者: delta-waves 時(shí)間: 2025-4-1 02:53 作者: mechanism 時(shí)間: 2025-4-1 07:45 作者: NAV 時(shí)間: 2025-4-1 10:29 作者: 五行打油詩 時(shí)間: 2025-4-1 18:20
