2,815 research outputs found
A Study of Attitudes of L.D.S. Senior Citizens of Logan, Utah Regarding Personal Adjustments
The objectives of this study were first, to examine the attitudes of L.D.S. (members of the Church of Jesus Christ of Latter-Day Saints; also commonly known as the Mormon Church) senior citizens living within the city limits of Logan, Utah regarding certain of their personal adjustments during old age (a personal adjustment score was derived from a scale developed by Cavan, Burgess, Havighurst and Goldhammer, 1949); and second, to determine whether selected variables were related to these attitudes toward personal adjustment. The variables examined in determining this relationship were chronological age, sex, marital status, the individual\u27s definition of present health, length of time in current housing and the degree of social involvement.
Each of the following four variables proved to have a positive, significant association with the personal adjustment attitudinal score--chronological age, marital status, the individual\u27s definition of present health and degree of social involvement. The two remaining variables are sex and length of time in current housing. Neither of these latter two was found to be significantly associated with the personal adjustment scor
Notes on a theory of the thermocline
The very large number of bathythermograms which have been taken during the last few years have established the essential features of the temperature structure in the upper layers of the ocean…
Optical bistability involving planar metamaterial with broken structural symmetry
We report on a bistable light transmission through a planar metamaterial
composed of a metal pattern of weakly asymmetric elements placed on a nonlinear
substrate. Such structure bears the Fano-like sharp resonance response of a
trapped-mode excitation. The feedback required for bistability is provided by
the coupling between the strong antiphased trapped-mode-resonance currents
excited on the metal elements and the intensity of inner field in the nonlinear
substrate.Comment: 4 pages, 4 figure
Age validation of quillback rockfish (Sebastes maliger) using bomb radiocarbon
Rockfishes (Sebastes spp.) support one of the most economically important f isheries of the Pacific Northwest and it is essential for sustainable management that age estimation procedures be validated for these species. Atmospheric testing of thermonuclear devices during the
1950s and 1960s created a global radiocarbon (14C) signal in the ocean environment that scientists have identified
as a useful tracer and chronological marker in natural systems. In this study, we first demonstrated that fewer samples are necessary for age validation using the bomb-generated 14C signal by emphasizing the utility of the time-specific marker created by the initial rise of bomb-14C. Second, the bomb-generated 14C signal retained in fish otoliths was used to validate the age and age estimation method of the quillback rockfish (Sebastes maliger) in the
waters of southeast Alaska. Radiocarbon values from the first year’s growth of quillback rockfish otoliths were plotted against estimated birth year to produce a 14C time series spanning 1950 to 1985. The initial rise in bomb-14C from prebomb levels (~ –90‰) occurred in 1959 [±1 year]
and 14C levels rose relatively rapidly to peak Δ14C values in 1967 (+105.4‰) and subsequently declined through the end of the time series in 1985 (+15.4‰). The agreement between the year of initial rise of 14C levels from the quillback rockfish time series and the chronology determined for the waters of southeast Alaska from yelloweye rockfish (S. ruberrimus) otoliths validated the aging method for the quillback rockfish. The concordance of the entire quillback rockfish 14C time series with the yelloweye rockfish time series demonstrated the effectiveness of this age validation
technique, confirmed the longevity of the quillback rockfish up to a minimum of 43 years, and strongly confirms higher age estimates of u
Magnetic dipole moments in single and coupled split-ring resonators
We examine the role of magnetic dipoles in single and coupled pairs of
metallic split-ring resonators by numerically computing their magnitude and
examining their relative contributions to the scattering cross section. We
demonstrate that magnetic dipoles can strongly influence the scattering cross
section along particular directions. It is also found that the magnetic dipole
parallel to the incident magnetic field and/or high-order multipoles may play a
significant role in the linear response of coupled split-ring resonators.Comment: 7 pages, 3 figures, 1 tabl
Design, theory, and measurement of a polarization insensitive absorber for terahertz imaging
We present the theory, design, and realization of a polarization-insensitive
metamaterial absorber for terahertz frequencies. We derive
geometrical-independent conditions for effective medium absorbers in general,
and for resonant metamaterials specically. Our fabricated design reaches and
absorptivity of 78% at 1.145 ThzComment: 6 Pages, 5 figures; figures update
Ptychographic X-ray computed tomography of extended colloidal networks in food emulsions
As a main structural level in colloidal food materials, extended colloidal
networks are important for texture and rheology. By obtaining the 3D
microstructure of the network, macroscopic mechanical properties of the
material can be inferred. However, this approach is hampered by the lack of
suitable non-destructive 3D imaging techniques with submicron resolution.
We present results of quantitative ptychographic X-ray computed tomography
applied to a palm kernel oil based oil-in-water emulsion. The measurements were
carried out at ambient pressure and temperature. The 3D structure of the
extended colloidal network of fat globules was obtained with a resolution of
around 300 nm. Through image analysis of the network structure, the fat globule
size distribution was computed and compared to previous findings. In further
support, the reconstructed electron density values were within 4% of reference
values.Comment: 19 pages, 4 figures, to be published in Food Structur
Long-period waves over California\u27s continental borderland. Part III The decay of tsunamis and the dissipation of tidal energy
The characteristic damping (energy e-folding) time derived from the decay of the tsunami pulse can be compared to the dissipation time of the lunar semidiurnal tides as inferred from the discrepancies in the orbital motions of the Moon, Sun, and Mercury. The times are comparable, of the order of ½ day, and this suggests that the same processes are responsible for the dissipation of the tide waves and tidal waves
Long-period waves over California\u27s continental borderland Part II. Tsunamis
During the Chilean tsunami of 22 May 1960, precise readings of sea level were digitally recorded every 15 seconds by the La Jolla low-frequency wave instrument. The tsunami remained above background for a week. The record gave a good opportunity to measure the decay of tsunami energy as a function of frequency. Energy is reduced by 1/e about once each half day. The decay is somewhat more rapid at high frequen cies and at high energy densities. The total energy of the tsunami is estimated to be of the order of 3 x 1023 ergs
Long-period waves over California\u27s continental borderland Part I. Background spectra
Long ocean waves, with frequencies between 0.2 and xo cycles per hour (cph), have been recorded simultaneously at La Jolla on the California coast and at San Clemente Island, about rno km seaward. The spectral power is greatest at the lowest frequencies but remains fairly uniform (about 5 x 10-2 cm2/cph) between 0.7 and 10 cph. Comparison of the Island and shore records shows that at the lowest frequencies (below 0.7 cph) the two records are consistently in phase and are highly coherent, as might be expected; above 0.7 cph they are out of phase, and the coherence is low...
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