作者: accessory 時間: 2025-3-21 23:01 作者: Ophthalmologist 時間: 2025-3-22 02:18
A Green’s Function Method for One-Way Wave Propagation in a Range-Dependent Ocean Environmentronment. However, there has been no exact theory for applying the Green’s function approach to one-way wave propagation in a range-dependent environment. This paper derives a generalized Green’s function method for exactly solving the one-way wave equation in an environment that varies discretely in作者: peptic-ulcer 時間: 2025-3-22 06:03 作者: THROB 時間: 2025-3-22 08:42
An Acoustic Reflectivity Method for Laterally Varying Layered Medial layers. The equations of motion are Fourier transformed with respect to time and Fourier-Bessel transformed with respect to the horizontal coordinates. Then one computes the exact response of the layer stack using Haskell. matrices, or Kennett. iteration, or the global matrix method of Schmidt. an作者: 慌張 時間: 2025-3-22 13:48
A Vector Parabolic Equation Model for Elastic Propagation published model, based on a Born approximation for scattering from an inhomogeneous layer, enables parabolic equation (PE) computations in elastic media with different longitudinal and shear speeds. This method of derivation is shown to reduce to the normal PE for the scalar case. The elastic PE mo作者: Condyle 時間: 2025-3-22 17:07 作者: intricacy 時間: 2025-3-22 23:00 作者: Hemiplegia 時間: 2025-3-23 04:51
Development of a Parabolic Approximation for the Computation of Propagation Loss in a Range-Dependenolution for a quadratic development of the propagation operator which allows us to take into account a larger angular aperture of the source. The numerical solution is given by an algorithm of finite differences using the Crank-Nicholson method. The problem of rectilinear, horizontal and oblique int作者: 配置 時間: 2025-3-23 06:11
Linear and Nonlinear Ocean Acoustic Propagation Modelsfluid dynamics a nonlinear time domain wave equation is then derived. A unidirectional approximation leads to a nonlinear time domain version of the parabolic equation, a nonlinear progressive wave equation (NPE), which can treat propagation of finite amplitude signals in a refracting medium in a wa作者: 跳脫衣舞的人 時間: 2025-3-23 12:08 作者: 鋸齒狀 時間: 2025-3-23 13:52 作者: 排他 時間: 2025-3-23 20:39 作者: 清洗 時間: 2025-3-23 23:53 作者: Phagocytes 時間: 2025-3-24 02:51 作者: BOON 時間: 2025-3-24 07:10 作者: inventory 時間: 2025-3-24 13:49
Predicted Partitioning of VLF Acoustic Energy in a Range-Dependent Environmentpport of the Cape Fear VLF Exercise to be conducted during June 1985. Because the first several hundred meters of subbottom in this area consist of sediments that can only weakly support shear, the effect of shear in the subbottom will be primarily to increase transmission loss. This increased trans作者: Irrepressible 時間: 2025-3-24 18:17 作者: 持久 時間: 2025-3-24 20:38 作者: 背心 時間: 2025-3-25 00:14 作者: 跑過 時間: 2025-3-25 07:20 作者: JIBE 時間: 2025-3-25 07:46 作者: 嚙齒動物 時間: 2025-3-25 13:38
Homer P. Bucker,Michael B. Porterlle ist dort begrenzt, wo es notwendig ist, diese Stoffe rein zu erschmelzen. Auch Graphit als Tiegelmaterial ist dann nicht zu verwenden, wenn eine Kohlenstoffaufnahme des zu schmelzenden Materials unerwünscht ist. Wenn es gelingt, entweder ohne Tiegel oder in gekühlten Tiegeln und Kokillen zu schm作者: jettison 時間: 2025-3-25 19:34 作者: Organization 時間: 2025-3-25 22:20 作者: Mercantile 時間: 2025-3-26 03:39 作者: 填滿 時間: 2025-3-26 07:42 作者: Kaleidoscope 時間: 2025-3-26 08:28
nders, giving us the first capability of producing both global and local maps of the seafloor. Subsequently, better instrumentation and techniques led to a clearer, more quantitative picture of the seabed itself, which stimulated new hypotheses such as seafloor spreading through the availability of 作者: Costume 時間: 2025-3-26 13:57
Book 1986ing us the first capability of producing both global and local maps of the seafloor. Subsequently, better instrumentation and techniques led to a clearer, more quantitative picture of the seabed itself, which stimulated new hypotheses such as seafloor spreading through the availability of more relia作者: invulnerable 時間: 2025-3-26 19:20 作者: GLUE 時間: 2025-3-26 22:00
Predicted Partitioning of VLF Acoustic Energy in a Range-Dependent Environment the effective subbottom parameters are discussed. The numerical results presented include the transmission loss as a function of depth and range and the relative fraction of acoustic energy that is bottom-interacting.作者: OGLE 時間: 2025-3-27 02:39
A Green’s Function Method for One-Way Wave Propagation in a Range-Dependent Ocean Environment term. On a given range step, the source distribution is the acoustic field at the end of the previous step. It is shown numerically that the method gives an accurate solution for one-way propagation.作者: Fierce 時間: 2025-3-27 05:57 作者: Arboreal 時間: 2025-3-27 09:41 作者: Largess 時間: 2025-3-27 13:48
Shear Wave Effects on Propagation to a Receiver in the Substrateical and horizontal displacements are found to increase significantly when shear wave processes are included. An analysis of the range dependence of displacement suggests that shear wave propagation is the major acoustical mechanism producing this increase.作者: jeopardize 時間: 2025-3-27 21:03 作者: llibretto 時間: 2025-3-27 22:50
D. R. DelBalzo,J. E. Matthews,J. V. Soileau,C. Feuillade作者: 可觸知 時間: 2025-3-28 04:35
teigt also die Wahrscheinlichkeit für einen st?rungsfreien Betrieb und eine hohe Lebenserwartung verzinkter Installationsrohre. Einschr?nkend ist hier jedoch auf die stark ungleichm??ige Anfangskorrosion bei pH-Werten um 7,9 hinzuweisen, da nicht auszuschlie?en ist, da? sich diese Effekte bei noch h作者: GILD 時間: 2025-3-28 07:30
L. Neil Frazer,John J. McCoyErgebnisse befriedigend zu erkl?ren. Insbesondere bedeutet die nicht vorhandene oder nur sehr geringe Abh?ngigkeit der Korrosionsgeschwindigkeit vom Sauerstoffgehalt, da? der Transportwiderstand der Deckschicht proportional den Sauerstoffkonzentrationen sein mü?te. Keine der an den Deck- schichten v作者: Thrombolysis 時間: 2025-3-28 14:29 作者: 變異 時間: 2025-3-28 18:21
J. Miller,A. Nagl,H. überallelbarer Erw?rmung wird die W?rmeenergie von au?en an das Schmelzgut herangebracht und geht durch W?rmeleitung, Konvektion, W?rmestrahlung oder elektromagnetische Strahlung auf das Gut über. Die unmittelbare Erw?rmung dagegen l??t die W?rme im Gut selbst entstehen. Auch Grenzf?lle zwischen unmittelba作者: Accede 時間: 2025-3-28 19:05 作者: chronicle 時間: 2025-3-29 00:20
Homer P. Bucker,Michael B. Porterelbarer Erw?rmung wird die W?rmeenergie von au?en an das Schmelzgut herangebracht und geht durch W?rmeleitung, Konvektion, W?rmestrahlung oder elektromagnetische Strahlung auf das Gut über. Die unmittelbare Erw?rmung dagegen l??t die W?rme im Gut selbst entstehen. Auch Grenzf?lle zwischen unmittelba作者: Criteria 時間: 2025-3-29 04:00 作者: MIR 時間: 2025-3-29 07:48
Bottom Interaction Effects on Normal Modes: an Algebraic Approach作者: 鉆孔 時間: 2025-3-29 12:17 作者: 有花 時間: 2025-3-29 15:59
Intrinsic Modes in a Wedge-Shaped Ocean with Stratified Elastic Bottomlanted interface. The model is now generalized to allow for stratification of the slanted bottom along planes parallel to the water-bottom interface, and for elastic properties in these layers. Examined in detail is the special case where the bottom is an elastic half space. Upslope propagation in t作者: LEVER 時間: 2025-3-29 22:35
An Acoustic Reflectivity Method for Laterally Varying Layered Mediabed as a stack of plane parallel layers; however, within each layer the velocity, density, and quality factor, Q, are now functions of horizontal position x. These functions are all independent from layer to layer so any earth or sea-bed model can be parameterized in this way. The two foundations of作者: Lumbar-Spine 時間: 2025-3-30 00:36 作者: 最高峰 時間: 2025-3-30 06:32
Gaussian Beams and 3-D Bottom Interacting Acoustic Systemsy differential equation along the central ray. This latter method has recently received a lot of attention in the seismological community. Both methods are free of the difficulties at caustics and in shadow zones which afflict standard ray tracing algorithms. Comparisons are presented between the st作者: Offbeat 時間: 2025-3-30 08:40
A Study of Propagation Loss Dependence on Sediment Layer Thickness Using the Fast Field Programhe intermediate layer is lossy produces an increasing loss with increasing layer thickness by straightforward absorption. This paper uses the Fast Field Program (FFP) to investigate these effects parametrically in a three layer simulation. It is shown that dependence of loss on layer thickness may t作者: Infirm 時間: 2025-3-30 15:37 作者: 刪除 時間: 2025-3-30 18:28
Experimental Confirmation of Horizontal Refraction of Sound Propagation in a Wedge-Like Oceanls which showed significant bearing shifts due to repeated reflections from the ocean surface and bottom. The obliqueness of the azimuthal launch angle with respect to the shore line prevented the local grazing angle from becoming large enough to produce much bottom loss which is in accord with pred作者: Innovative 時間: 2025-3-30 22:40
Acoustic Propagation over Large-Scale Linear Ocean Slopes generic class (passive margin) was chosen for detailed acoustic propagation calculations. The passive-margin slope is common in the North Atlantic, has a vertical angle of 2.8°, and is covered by 500 m of silt. Using a summer Sargasso Sea sound speed profile, numerous calculations of transmission l作者: 擦掉 時間: 2025-3-31 03:01 作者: Relinquish 時間: 2025-3-31 08:08
re of the seafloor is still far from complete. Underwater acoustics concerns itself today with the phenomena of propagation and noise at frequencies and ranges that require an understanding of acoustic interaction at both of its boundaries, the sea surface and seafloor, over depths ranging from tens to thousa978-1-4612-9293-7978-1-4613-2201-6作者: 神刊 時間: 2025-3-31 11:24
9樓作者: 意見一致 時間: 2025-3-31 15:04
9樓作者: 必死 時間: 2025-3-31 17:50
10樓作者: 不整齊 時間: 2025-4-1 00:10
10樓作者: 議程 時間: 2025-4-1 01:50
10樓作者: 印第安人 時間: 2025-4-1 06:52
10樓
