405,374 research outputs found
POLAR investigation of the Sun—POLARIS
No full textThe POLAR Investigation of the Sun (POLARIS) mission uses a combination of a gravity assist and solar sail propulsion to place a spacecraft in a 0.48 AU circular orbit around the Sun with an inclination of 75° with respect to solar equator. This challenging orbit is made possible by the challenging development of solar sail propulsion. This first extended view of the high-latitude regions of the Sun will enable crucial observations not possible from the ecliptic viewpoint or from Solar Orbiter. While Solar Orbiter would give the first glimpse of the high latitude magnetic field and flows to probe the solar dynamo, it does not have sufficient viewing of the polar regions to achieve POLARIS’s primary objective: determining the relation between the magnetism and dynamics of the Sun’s polar regions and the solar cycle
A grounded theory of female adolescent behaviour in the sun: comfort matters.
No full textThe aim of the research was to generate a grounded theory to explain the behaviour of young women in the sun. The study sought to explore the sun-related experiences of
young women in order to gain new insights into the influences upon them. The study was qualitative by design and utilised grounded theory method as developed by Glaser.
Twenty female participants, aged 14 to 17 years old were included in the study. They formed six groups. Thirteen interviews were carried out with the groups and six one-to one interviews took place with individuals. All interviews were semi-structured and were based upon the participants' experiences of being in the sun. Data was analysed using the
constant comparative method of data analysis, concordant with Glaserian grounded theory method. Five explanatory categories emerged from the data; Fitting In, Being Myself,
Being Physically Comfortable, Slipping Up and a core category of Being Comfortable. One of the issues that emerged was that some young women believed their social
acceptance depended on their appearance and they conformed to this end. The theory, derived from the categories, proposes that when in the sun, young women direct their
activities toward meeting physical and psychosocial comfort needs. Comfort matters to them because it has implications for their wellbeing. This thesis contributes to the literature about the behaviours of young women in the sun.
By increasing understanding of the factors that influence them, it also adds to the body of knowledge related to the primary prevention of skin cancer with teenage girls in the United Kingdom. The outcome of the research and its contribution to knowledge is a grounded theory, which explains the basis of the behaviours of young women in the sun. It appears that no other study has explored the experiences of UK adolescent females specifically, in
a qualitative way and with the intention of producing a theory to explain them
MAGEC_2024
No full textMAGEC (Magma And Gas Equilibrium Calculator)
Author: Chenguang Sun
Copyright, 2025
This Matlab program calculates the equilibrium distribution of C-H-O-S volatiles (H2, H2O, CO, CO2, CH4, H2S, SO2, S2, COS, O2) in gas-melt coupled systems.
Updates on April 27, 2025:
1. Added additional options for CO2 and H2O solubility models
2. Corrected CO solubility models
If you use this program for your publications, please cite the following references:
1. Sun, C. and Yao, L., 2024. Redox equilibria of iron in low-to high-silica melts: A simple model and its applications to CHOS degassing. Earth and Planetary Science Letters, 638, p.118742. [Note: This is the reference for MAGEC_2024 with new Fe- and S-redox models and flexible setting options.]
2. Sun, C. and Lee, C.T.A., 2022. Redox evolution of crystallizing magmas with CHOS volatiles and its implications for atmospheric oxygenation. Geochimica et Cosmochimica Acta, 338, pp.302-321. [Note: This is the reference for the first version of MAGEC.]
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How to run the program:
1. Input T/P/logfO2 (or Fe3+/FeT) and compositions in the input file (.xlsx).
Make sure you use different names for the input and output files.
The batch data could be polybaric/isobaric/adiabatic degassing.
2. Modify the "settings" in the input file.
3. Open [Run_MAGEC_2024_v2.m] in Matlab
4. Go to [Editor] Tab in Matlab and click [Run] button.
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Selected boulders at Copernicus central peak from L. Sun and P. Lucey Lunar boulder study work
No full textThis file contains the location of 54 boulders and soils on Copernicus central peak that were studied by Sun L. and Lucey P. G. in their lunar boulder study paper. This file can be uploaded to the LROC Quickmap website (https://quickmap.lroc.asu.edu/) for checking the location of each boulder and their nearby soils
Dissipation and emission of p-mode in the quiet sun from acoustic imaging with TON data
No full text[[abstract]]Here we present the result using acoustic imaging technique to study the dissipation and emission of p-modes in the quiet Sun. In acoustic imaging, the acoustic signal at a target point and target time is reconstructed by coherently summing the signals measured in an annular region centered at the target point based on the time-distance relation. The signal can be constructed with the ingoing time-distance or outgoing time-distance curve. The difference between the signals constructed with ingoing and outgoing time-distance relations provide information of dissipation and emission of p-modes. We use the helioseismic data observed with the Taiwan Oscillation Network (TON) instruments. We select a very quiet region to minimize the interference of the active region in seven data sets. The data sets are filtered with two band-pass filters to study the frequency dependency. We also use two different annular regions, which corresponds to two different wavenumber ber ranges, to study the wavenumber dependency. The results show that absorption increases with frequency and wavenumber. This indicates acoustic imaging can detect the absorption of p-modes in the quiet Sun. However, there exists an unknown offset such that it appears as emission for small wavenumber and low frequency.[[fileno]]2010507010036[[department]]天文
Sun-safe behaviour among secondary school students in Australia
No full textThis paper reports data on the first national survey of sun-protection measures of Australian secondary school students. A cross-sectional survey of a representative sample of 23,915 Australian school children in Years 7-12 was conducted in 1993. Students were questioned about usual sun-protection practices, beliefs about skin cancer and suntans, and sunburn history. The results showed differences in sun-protection behaviours as a function of 'year level', 'gender', 'skin type' and 'concern about getting cancer' among others. Adolescents who believe there is a lot they can do to avoid skin cancer are more likely to engage in sun-protective behaviours. Males were more likely to wear a cap, yet females tended to use sunscreen. The use of clothing to protect themselves from the sun was higher in males, yet females were more likely to stay mainly in the shade. All behaviours decreased with age. Poorer protective practices were also associated with increased sunburn, except for sunscreen use where the converse was the case. Suntan was still a desire for adolescents. While there is considerable room for improvement in the sun-protection behaviour of adolescents (particularly those in higher grades), most students usually take some precautions. However, by Year 12 (17 and 18 year olds) less than half report usually wearing a hat and just two-thirds reported usual sunscreen usage
A new policy direction and four guidelines for Valley of the Sun United Way's investment in the community
No full textabstract: After decades of charitable generosity in the Valley of the Sun, the 1990s have brought new challenges which require a re-assessment of priorities. Facing continued and rapid population growth, and continuing efforts to reform and restrain public spending on many levels, Valley of the Sun United Way initiated a strategic planning process in 1996 to identify guiding principles and key issues for the future.
In late 1997, Valley of the Sun United Way, with funding support from Honeywell, Inc., asked the Morrison Institute for Public Policy to identify the most critical public issues facing the community and to determine where United Way could have the greatest impact with its investments by targeting its funding and support. To do this, the Institute conducted 49 one-on-one interviews with opinion leaders from the business, government, and non-profit sectors in the Phoenix Metro area, held one focus group with a subset of the interviewees, and reviewed a large body of published research and surveys in Arizona and the U.S.Includes bibliographical references (p. 21-22).Copyright by the Arizona Board of Regents for and on behalf of Arizona State University and its Morrison Institute for Public Polic
Phasia varicolor Sun & Marshall 2003
No full textKey to species of the Phasia varicolor speciesgroup (The males of Phasia mathisi and Phasia sumatrana, and the female of Phasia latifrons are unknown.) 1. Mesonotum and tergites strongly pruinose; abdomen slender; male and female terminalia as Figure I16...................................................... P. cylindrata Sun, new species. Mesonotum and tergites not pruinose, or thinly pruinose; abdomen round; male and female terminalia variations.......................................................................................... 2 2. Female........................................................................................................................... 3 Male............................................................................................................................... 9 3. Sternite VII strongly bent ventrally............................................................................... 4 Sternite VII not bent ventrally....................................................................................... 5 4. Frons parallel; eyes separated by a distance wider than ocellar triangle (Fig.I62.2)...................................................................................... P. sumatrana Sun, new species ♀ Frons divergent; eyes separated by a distance narrower than ocellar triangle....................................................................................................... P. minima Sun, new species ♀ 5. Abdomen reddish yellow.............................................................................................. 6 Abdomen black, or mostly black................................................................................... 7 6. Sternite VII short and broad; apex rounded in ventral view (Fig. I64.6)....................................................................................................... P. triangulata Sun, new species ♀ Sternite VII slender, apex pointed in ventral view (Fig. I52.7)...................................................................................................................... P. rotundata Sun, new species ♀ 7. Eyes separated by a distance wider than ocellar triangle............................................. 8 Eyes almost touching each other.......... P. normalis (Curran, 1927) ♀ ( see page 135) 8. Flagellomere yellow; tergite V long, tapered............... P. varicolor (Curran, 1927) ♀ Flagellomere black; tergite V short, trapezoid............. P. mathisi Sun, new species ♀ 9. Abdomen reddish yellow........................................................................................... 10 Abdomen black or with dark yellow spots only.......................................................... 12 10. Distiphallus branched; syncercus deeply notched posteriorly.............................................................................................................................. P. varicolor (Curran, 1927) ♂ Distiphallus not branched; syncercus not notched or only shallowly notched posteriorly..................................................................................................................................... 10 11. Surstylus as long as cercus; pregonite developed.............................................................................................................................................. P. rotundata Sun, new species ♂ Surstylus much longer than cercus; pregonite even, not developed................................................................................................................ P. triangulata Sun. new species ♂ 12. Abdomen shining, without pruinosity; pregonite longer than postgonite; syncercus with a semicircular notch posteriorly........................... P. minima Sun, new species ♂ Abdomengreypruinose;pregoniteshorterthanpostgonite;syncercusnotnotchedasabove..................................................................................................................................... 13 13. Eyes separated by a distance narrower than ocellar triangle; syncercus widely Unotched posteriorly; phallus haired...... P. normalis (Curran, 1927) ♂ (see page 135) Eyes separated by a distance wider than ocellar triangle; syncercus Vnotched posteriorly; phallus not haired........................................... P. latifrons (Paramonov, 1958) ♂Published as part of Sun, Xuekui & Marshall, Stephen A., 2003, Systematics of Phasia Latreille (Diptera: Tachinidae), pp. 1-320 in Zootaxa 276 (1) on pages 192-193, DOI: 10.11646/zootaxa.276.1.1, http://zenodo.org/record/501951
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
On the spectral characterization of the p-sun and the (p,q)-double sun L. Emilio Allem, Lucas G.M. da Silveira e Vilmar Trevisan
No full textIn 1973 Schwenk [7] proved that almost every tree has a cospectral mate. Inspired by Schwenk's result, in this paper we study the spectrum of two families of trees. The p-sun of order is a star with an edge attached to each pendant vertex, which we show to be determined by its spectrum among connected graphs. The -double sun of order is the union of a p-sun and a q-sun by adding an edge between their central vertices. We determine when the -double sun has a cospectral mate and when it is determined by its spectrum among connected graphs. Our method is based on the fact that these trees have few distinct eigenvalues and we are able to take advantage of their nullity to shorten the list of candidates
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