Catalogue Search | MBRL
Are you sure you want to remove the book from the shelf?
{{itemTitle}}
16,705
result(s) for
"Solstice"
Sort by:
Under Alaska's midnight sun
On the longest day of the year, a young Alaskan girl stays up late and enjoys the midnight sun.
Book
Estimation of Hourly, Daily and Monthly Global Solar Radiation on Inclined Surfaces: Models Re-Visited
Global solar radiation is generally measured on a horizontal surface, whereas the maximum amount of incident solar radiation is measured on an inclined surface. Over the last decade, a number of models were proposed for predicting solar radiation on inclined surfaces. These models have various scopes; applicability to specific surfaces, the requirement for special measuring equipment, or limitations in scope. To find the most suitable model for a given location the hourly outputs predicted by available models are compared with the field measurements of the given location. The main objective of this study is to review on the estimation of the most accurate model or models for estimating solar radiation components for a selected location, by testing various models available in the literature. To increase the amount of incident solar radiation on photovoltaic (PV) panels, the PV panels are mounted on tilted surfaces. This article also provides an up-to-date status of different optimum tilt angles that have been determined in various countries.
Journal Article
Solstice : around the world on the longest, shortest day
Explore the daily lives of children around the world through the lens of a single, special day - June 21st, the longest day of the year in the northern hemisphere and the shortest in the southern hemisphere.
CHILDBOOK
Una hierofanía solar en el recinto de taula oeste de So na Caçana (Menorca)
Abstract The article presents the first documented evidence of a soLar hierophany in a TaLayotic monument on the island of Menorca. The documentation of this phenomenon provides compLeteLy new data about the rituaLs that took pLace in these sanctuaries, and it estabLishes a precise and important date in the unknown caLendar used by Menorcan communities during the second Iron Age. Keywords BaLearic IsLands, TaLayotic cuLture, Archaeoastronomy, rituaLity, winter soLstice. 1. El paramento perimetrai interno presenta una serie de pilastras encajadas en el mismo, situadas de forma radial y en número variable, dependiendo de la magnitud de cada recinto.
Journal Article
Showtime!
\"The King and Queen have put Sasha in charge of planning a Summer Solstice celebration for the horses of Verdant Valley and Crystal Cove! Sasha has never planned a big party before, and there are so many details! Will she find a way to pull this party off?\"-- Provided by publisher.
Book
Multi-model Meteorological and Aeolian Predictions for Mars 2020 and the Jezero Crater Region
Nine simulations are used to predict the meteorology and aeolian activity of the Mars 2020 landing site region. Predicted seasonal variations of pressure and surface and atmospheric temperature generally agree. Minimum and maximum pressure is predicted at
Ls
∼
145
∘
and
250
∘
, respectively. Maximum and minimum surface and atmospheric temperature are predicted at
Ls
∼
180
∘
and
270
∘
, respectively; i.e., are warmest at northern fall equinox not summer solstice. Daily pressure cycles vary more between simulations, possibly due to differences in atmospheric dust distributions. Jezero crater sits inside and close to the NW rim of the huge Isidis basin, whose daytime upslope (∼east-southeasterly) and nighttime downslope (∼northwesterly) winds are predicted to dominate except around summer solstice, when the global circulation produces more southerly wind directions. Wind predictions vary hugely, with annual maximum speeds varying from 11 to
19
ms
−
1
and daily mean wind speeds peaking in the first half of summer for most simulations but in the second half of the year for two. Most simulations predict net annual sand transport toward the WNW, which is generally consistent with aeolian observations, and peak sand fluxes in the first half of summer, with the weakest fluxes around winter solstice due to opposition between the global circulation and daytime upslope winds. However, one simulation predicts transport toward the NW, while another predicts fluxes peaking later and transport toward the WSW. Vortex activity is predicted to peak in summer and dip around winter solstice, and to be greater than at InSight and much greater than in Gale crater.
Journal Article
Effect of seasons and photoperiods on seminal attributes and sperm morphology in Holstein Friesian × Sahiwal crossbred dairy bulls
Cattle being non-seasonal breeding species, effects of photoperiods on sperm traits and morphology had been reported inadequately in breeding bulls. To elucidate the plausible existence of effects of photoperiods and seasons, seminal traits of Holstein Friesian × Sahiwal crossbred dairy bulls (N = 557) were analysed using different statistical models. A present study revealed that the biological rhythm of reproduction oscillated almost in parallel to the annual changes of natural photoperiods even in non-seasonal breeding species like cattle bulls. Semen traits diminished to the lowest in winter solstice (WS ± 45 days), progressively increased with the rising day length of spring (vernal equinox ± 45 days), reached a peak in summer solstice (SS ± 45 days), and then gradually reduced with decreasing photoperiod of the autumn equinox (AE ± 45 days). From summer solstice to winter solstice, sperm concentration reduced by 90.53 million/ml (8.85%), total sperm count/ejaculate decreased by 785 million (13.87%), total motile sperm count/ejaculate reduced by 17.59%, and total post-thaw motile sperm counts/ejaculates diminished by 38.64%. In short-duration photoperiods (≤ 12 h), bulls had a significantly (P < 0.01) higher incidence of major, minor, tail abnormality and total aberrant sperm% compared to that of long-duration photoperiods (> 12 h). Solstice equinox–based seasonal classification provided better insight into photoperiodicity on bulls’ semen quality and sperm traits as compared to conventional meteorological classification of seasons. It was concluded that photoperiods affect sperm productivity, semen quality, and sperm morphology in non-seasonal breeding species like dairy bulls, maintained at transitional latitude (29° N) tropical climate. Bulls’ reproductive ability was more influenced by the phases of increasing/decreasing day length duly primed by climax/trough of photoperiods, compared to mere long/short duration of photoperiods.
Journal Article
Annual/Seasonal Variation in Induction Vectors at Different Geological Locations in an Indian Sector
Magnetotelluric (MT) transfer functions, which carry information about the subsurface resistivity distribution, remain constant over time in geologically stable regions. However, recent results indicate the presence of significant seasonal changes in tipper/induction arrows irrespective of the geological processes. We have obtained the annual and seasonal variations in induction vectors at six observatories located in different geographical (island, inland, and coastal areas) and tectonic (cratonic, and passive/convergent margins) settings in India. Based on a 30-day period of data, the tipper/induction vectors are estimated by using 1-min magnetic variation data for 2 years at each site for a period range of 4–150 min. The average tipper amplitude variations range from 0.2 to 0.3 at coastal sites, from 0.1 to 0.2 at island sites, and < 0.1 at inland sites. The seasonal pattern at low-latitude sites is greatest at the summer solstice and smallest at the winter solstice, whereas at equatorial sites it is greatest at the winter solstice/autumnal equinox and smallest at the summer solstice. At low-latitude and equatorial sites, seasonal variation in the direction of the induction vectors is at the sharp conductivity contrast periods. The varying ranges of the seasonality of tipper amplitude and direction variations at different geological regimes are due to the interaction of the source field with the conductivity structure and the lateral changes in the conductivity around the particular site.
Journal Article
Days to remember. Episode 5, Solstices
Discover the science behind Solstices, the longest and shortest days of the year, and how Earth's tilt plays a crucial role in this phenomenon.
Streaming Video