9,314 research outputs found
Model-independent constraints on contact interactions from LEP2 data analysis
We derive model-independent constraints on four-fermion contact
interaction-type dynamics from the published preliminary LEP2 experimental data
on e^+e^- annihilation into \mu^+\mu^- and \tau^+\tau^- pairs, measured at
different energies between 130 and 207 GeV. The basic observables are chosen to
be the total cross section and the forward-backward asymmetry, and the analysis
realistically takes into account data uncertainties and correlations among
measurements at the various energies. The combination of data from different
energy points plays an important role in the determination of regions allowed
for the contact interaction coupling constants. In contrast to the more common
one-parameter analyses, we only obtain constraints on pairs of parameters
rather than limits on individual ones.Comment: 13 pages, LaTeX, including figures. v2: Included discussion of tau
data, version to appear in EPJ
Preliminary findings from a survey on the MD state of the practice
In the context of an Italian research project, this paper reports on an on-line survey, performed with 155 software professionals, with the aim of investigating about their opinions and experiences in modeling during software development and Model-driven engineering usage. The survey focused also on used modeling languages, processes and tools. A preliminary analysis of the results confirmed that Model-driven engineering, and more in general software modeling, are very relevant phenomena. Approximately 68% of the sample use models during software development. Among then, 44% generate code starting from models and 16% execute them directly. The preferred language for modeling is UML but DSLs are used as wel
Analytical modeling of magnetic field distribution at no load for surface mounted permanent magnet machines.
Aggression and Coexistence in Female Caribou
Female caribou (Rangifer tarandus) are highly gregarious, yet there has been little study of the behavioral mechanisms that foster coexistence. Quantifying patterns of aggression between male and female, particularly in the only cervid taxa where both sexes grow antlers, should provide insight into these mechanisms. We asked if patterns of aggression by male and female caribou followed the pattern typically noted in other polygynous cervids, in which males display higher frequencies and intensity of aggression. From June to August in 2011 and 2012, we measured the frequency and intensity of aggression across a range of group sizes through focal animal sampling of 170 caribou (64 males and 106 females) on Adak Island in the Aleutian Archipelago, Alaska. Males in same-sex and mixed-sex groups and females in mixed-sex groups had higher frequencies of aggression than females in same-sex groups. Group size did not influence frequency of aggression. Males displayed more intense aggression than females. Frequent aggression in mixed-sex groups probably reflects lower tolerance of males for animals in close proximity. Female caribou were less aggressive and more gregarious than males, as in other polygynous cervid species.La femelle caribou (Rangifer tarandus) est trĂšs grĂ©gaire et pourtant, trĂšs peu dâĂ©tudes ont Ă©tĂ© faites sur les mĂ©canismes du comportement qui favorisent la coexistence. Des modĂšles quantificateurs dâagression entre le mĂąle et la femelle, particuliĂšrement chez le seul cervidĂ© oĂč les deux sexes possĂšdent des bois, devraient permettre dâen savoir plus sur ces mĂ©canismes. Nous nous sommes demandĂ© si les modĂšles dâagression entre la femelle et le mĂąle caribou ressemblaient aux modĂšles dâagression gĂ©nĂ©ralement remarquĂ©s chez dâautres cervidĂ©s polygynes, pour lesquels les mĂąles affichent une frĂ©quence et une intensitĂ© dâagression plus grandes. De juin Ă aoĂ»t 2011 et 2012, nous avons mesurĂ© la frĂ©quence et lâintensitĂ© dâagression au sein de groupes de tailles diverses, et ce, au moyen de lâĂ©chantillonnage centrĂ© de 170 caribous (64 mĂąles et 106 femelles) sur lâĂźle Adak de lâarchipel des AlĂ©outiennes, en Alaska. Les mĂąles des groupes du mĂȘme sexe et des groupes mixtes, et les femelles de groupes mixtes affichaient une plus grande frĂ©quence dâagression que les femelles se trouvant dans des groupes du mĂȘme sexe. La frĂ©quence dâagression nâĂ©tait aucunement influencĂ©e par la taille du groupe. LâintensitĂ© dâagression des mĂąles Ă©tait plus grande chez le mĂąle que chez la femelle. Lâagression frĂ©quente dans les groupes mixtes est probablement reprĂ©sentative de la plus faible tolĂ©rance des mĂąles Ă la prĂ©sence dâanimaux Ă proximitĂ©. Les femelles caribou Ă©taient moins agressives et plus grĂ©gaires que les mĂąles, Ă lâinstar dâautres espĂšces de cervidĂ©s polygynes
Polycyclic Aromatic Hydrocarbon Size Tracers
We examine the dependence of polycyclic aromatic hydrocarbon (PAH) band
intensity ratios as a function of the average number of carbon atoms and assess
their effectiveness as tracers for PAH size, utilising the data, models, and
tools provided by the NASA Ames PAH Infrared Spectroscopic Database. To achieve
this, we used spectra from mixtures of PAHs of different ionisation fractions,
following a size distribution. Our work, congruent with earlier findings, shows
that band ratios that include the 3.3 m PAH band provide the best PAH
size tracers for small-to-intermediate sized PAHs. In addition, we find that
band ratios that include the sum of the 15-20 m PAH features
(I) and the 6.2 or 7.7 m bands also serve as good
tracers for PAH size in the case of small-to-intermediate sized PAHs, for
objects under a similar PAH size distribution as with the presented models. For
different PAH size distributions, the application of a scaling factor to the
I/I ratio can provide estimates for the size of the
small-to-intermediate PAH population within sources. Employment of the
I/I and I/I ratios can be
of particular interest for JWST observations limited only to 5-28
m MIRI(-MRS) coverage.Comment: 8 pages, 5 figures; Accepted for publication in MNRA
Perbedaan Kompetensi Sosial Anak Berdasarkan Tipe Pendidikan Prasekolah
Penelitian ini bertujuan untuk mengetahui peran tipe pendidikan prasekolah dalam kompetensi sosial anak. Dua hipotesis diajukan untuk menguji perbedaan kompetensi sosial anak dengan tipe pendidikan prasekolah penuh waktu dan paruh waktu. Subjek penelitian ini adalah 209 orang anak usia lima sampai dengan enam tahun yang mengikuti salah satu tipe pendidikan prasekolah (paruh waktu atau penuh waktu) yang berasal dari enam Taman Kanak-kanak di Yogyakarta (Budi Mulia I Kaliurang, Primagama Kaliurang, ABA Purwodiningratan, Nurul Islam Ringroad Barat, BIAS Kaliurang, dan Budi Mulia Dua Seturan). Data penelitian diperoleh dengan menggunaka skala kompetensi sosial, kuesioner keluarga dan dokumentasi sekolah. Skala kompetensi sosial dinilai oleh guru kelas dengan menggunakan teknik interrater. Jumlah item pada skala kompetensi sosial adalah 30 item. Setelah uji coba terdapat 4 item yang gugur. Daya beda item berkisar dari 0,303-0,581 dengan angka reliabilitas 0,890. Sedangkan nilai reliabilitas antar rater berkisar antara 0,867-0,998. Hasil ANCOVA, diperoleh kesimpulan hasil penelitian bahwa: (1) ada perbedaan kompetensi sosial anak dengan tipe pendidikan prasekolah paruh waktu dan penuh waktu. Kompetensi sosial anak dengan tipe pendidikan prasekolah penuh waktu lebih tinggi daripada kompetensi sosial anak dengan tipe pendidikan prasekolah paruh waktu (F = 21,612; p = 0,000). (2) tidak ada korelasi antara kompetensi sosial anak yang berusia lima tahun sampai dengan enam tahun (F = 1,781; p = 0,184)
Leadership Journey: Knights Helping Knights Pantry
During the Fall 2023 semester, we volunteered at Knights Helping Knights Pantry (KHKP). KHKP is UCFâs on-campus food pantry, which provides food, clothing, and supplies to the students and staff. Their goal is to battle food insecurity within UCFâs community and de-stigmatize the use of food pantries.https://stars.library.ucf.edu/hip-2023fall/1006/thumbnail.jp
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