Dynamics and Transformation of Sea Surface Gravity Waves at the Shelf of Decreasing Depth

This paper reviews the results of the processing of synchronized data on hydrosphere pressure variations and the Earth’s crust deformation in the microseismic range (5–15 s), obtained over the course of numerous experiments, using a coastal laser strainmeter and laser meters of hydrosphere pressure variations installed in various points of the Sea of Japan shelf. Interpreting the results, we have discovered new regularities in the dynamics of surface progressive gravity waves, and their transformation into primary microseisms, when waves move at the shelf of decreasing depth. For example, we found non-isochronous behavior of progressive waves, which manifests itself in a decrease in the periods of gravity waves due to the transformation of a part of their energy into the energy of primary microseisms. Furthermore, when processing the synchronous fragments of the records, made by laser strainmeters and laser meters of hydrosphere pressure variations, we identified approximate zones of the most effective transformation of the energy of gravity progressive waves into the energy of primary microseisms, which start from the depth of less than a half-wavelength and stretch to the surf zone.

The Nobel Laureate Georg von Békésy’s Hearing Theory

After Békésy the stapes base moves around two axes: for weaker sounds - rotates around its transverse axis; in case of a strong sound - it moves around its longitudinal axis. Békésy’s place theory cannot alone explain the frequency-distinguishing ability of the ear. However, the existence of active amplification further sharpens the frequency-analysing ability of the cochlea. In addition, the different frequency sensitivity of afferent nerve fibres of inner hair cells synergizes with the mechanisms above. Peaked resonance curves are consequences of different threshold sensitivities of nerves connecting to individual hair cells. The frequency, which belongs to the lowest stimulus threshold, is called the characteristic frequency of a nerve. This place assignment of nerve frequencies are formed by the following mechanism in the cochlea. The place of amplitude maxima of progressive waves excited in the basilar membrane shows slight frequency dependence. The mechanism of active amplification forming in outer hair cells amplifies and sharpens the resonances of the basilar membrane. In 1961, nobleman Georg von Békésy received the Nobel Prize in Medicine: “for his discoveries of the physical mechanisms of stimulation within the cochlea”.

MASS TRANSPORT OF WAVES ON THE SURFACE OF THE FLUID

This paper is devoted to problem of mass transport of fluid for the surface progressive waves. New solutions for transitional current are obtained. Both Stokes and cnoidal waves are considered.

Postmodern Deconstruction of Grand Narratives in Post-Cyberpunk Fiction through Thematic Analysis

The issue of identity and its representation is a constant phenomenon since the advent of humanity. Progressive waves of technological advancement in information technology have made the contemporary culture bombastic and dynamic, due to which identity and its representation have become complex. Identity and representation are no more inert; rather, they have become fluid and arbitrary phenomenon. Postmodernist literature does not only represent life and its related issue but also simultaneously deconstructs them to the core; hence there remain no center/margin dichotomies. This study is an analysis of different themes under the theoretical framework of Deconstruction of Metanarratives (1984) and Cybernetics (1948). The method of analysis is Deconstruction by Derrida (1967), from which the tool of intertextuality has helped the researchers to answer the research questions. Analysis of various themes such as Artificial Intelligence, Techno/Globalization, Cyborg, and Posthuman conclude that transition of identity is a repetitive facet of todays individual. Hence, there are no grand narratives of representations. Different identities such as race, gender, religion, human/machine, natural/artificial, physical/nonphysical, real/virtual, life/death have become contestable. This research proves that the deconstruction of metanarratives has given vent to the mini narratives.

Heating of the Midshelf and Inner Shelf by Warm Internal Tidal Bores

Cross-shore heat flux (CHF) spatiotemporal variability in the subtidal (ST), diurnal (DU), and semidiurnal (SD) bands is described for 35 days (summer 2015) from collocated vertical measures of temperature and currents obtained by moorings deployed from 50- to 7-m water depths near Pt. Sal, California. The CHF is largest in the ST and SD bands, with nearly zero contribution in the DU band. The sum of CHF and surface heat flux (SHF) account for 31% and 17% of the total change in heat storage on the midshelf and inner shelf, respectively. The ST CHF for the midshelf and inner shelf is mostly negative and is correlated with upwelling-favorable winds. A mostly positive SD CHF on the midshelf and inner shelf decreases linearly in the shoreward direction, is correlated with wind relaxations, and is attributed to warm-water internal tidal bores (WITBs) that are observed to propagate to the edge of the surf zone. A negative SD CHF is correlated with upwelling-favorable winds on the midshelf at 15–25-h time lags, and is believed to be associated with cold-water internal tidal bores. The WITBs have characteristics of progressive waves on the midshelf and transition to partially standing waves on the inner shelf potentially reducing the SD CHF contribution on the inner shelf. Heat accumulation over the midshelf and inner shelf is primarily driven by WITBs and SHF, which is largely balanced by cumulative cooling by ST processes over the midshelf and cumulative cooling by alongshore heat flux (AHF) over the inner shelf.

Elastodynamics. Sinusoidal progressive waves

This chapter briefly considers linear elasticity under circumstances in which inertial effects are accounted for, and states the initial-boundary-value-problem of linear elastodynamics. Sinusoidal progressive waves form an important class of solutions to the equations of linear elastodynamics. Such waves for isotropic media in the absence of a conventional body force are considered and it is shown that for an isotropic medium only two types of sinusoidal progressive waves are possible: longitudinal and transverse.