11,133 research outputs found
Genera of the bee tribe Reedapini (Hymenoptera: Colletidae)
Those bees classified in the genera Reedapis Michener and Cephalocolletes Michener are discussed and organized into a new tribe, Reedapini Engel. In addition, three species formerly classified in Cephalocolletes are removed to two new genera: Lonchopriscus Engel, new genus, with the species Lonchopriscus crassipunctatus (Urban), new combination, and Cactocolletes Engel, new genus, for Cactocolletes isabelae (Urban), new combination, and C. rugatus (Urban), new combination. The tribe and its constituent genera are diagnosed, and a key is provided for the identification of the latter along with their included species
Ring Strongly k-Engel π-Reguler
Ring -regular merupakan salah satu pengembangan konsep
pada struktur aljabar. Suatu elemen disebut strongly -regular jika
terdapat suatu bilangan bulat positif dan elemen sedemikian
sehingga . Jika setiap elemen di merupakan
strongly -regular, maka disebut strongly -regular. Suatu elemen
disebut strongly -Engel -regular jika terdapat suatu
bilangan bulat positif dan elemen sedemikian sehingga
[ ] [ ] [ ] . Jika setiap elemen di
merupakan strongly -Engel -regular, maka disebut strongly
-Engel -regular
Predicting Proton-Air Cross Sections at sqrt s ~30 TeV, using Accelerator and Cosmic Ray Data
We use the high energy predictions of a QCD-inspired parameterization of all
accelerator data on forward proton-proton and antiproton-proton scattering
amplitudes, along with Glauber theory, to predict proton-air cross sections at
energies near \sqrt s \approx 30 TeV. The parameterization of the proton-proton
cross section incorporates analyticity and unitarity, and demands that the
asymptotic proton is a black disk of soft partons. By comparing with the p-air
cosmic ray measurements, our analysis results in a constraint on the inclusive
particle production cross section.Comment: 9 pages, Revtex, uses epsfig.sty, 5 postscript figures. Minor text
revisions. Systematic errors in k included, procedure for extracting k
clarified. Previously undefined symbols now define
Comparación del Gasto de los hogares colombianos entre 1997 y 2003, según resultados de encuestas de calidad de vida: magnitud, composición y distribu
El propósito de este estudio es analizar el cambio en magnitud, composición y distribución del gasto de los hogares en los años 1997 y 2003, usando las encuestas de calidad de vida. Este análisis encuentra una gran disminución del gasto per cápita (23.9%), especialmente en zonas urbanas y regiones más adelantadas, reflejo de la crisis económica que golpea al país desde 1998. Este decrecimiento desigual generó una mejor distribución en el 2003 y ocasionó un cambio en la estructura de gastos, llevando a un importante crecimiento de la proporción de los gastos en alimentos y una disminución de los gastos de educación y salud. En el documento se utilizó estadística descriptiva, discriminando por quintiles de cada región y clase (urbano rural). Posteriormente se realizaron estimaciones paramétricas y no paramétricas de las curvas de Engel, para cada rubro, con el fin de identificar su naturaleza.*************************************************************************************************************The purpose of this study is to analyze the change in magnitude, composition and distribution of the household's expenditure in 1997 and 2003, using quality of life surveys. The analysis shows a decrease in the per capita expenditure (23,9%), specially in rural zones and richer regions, which reflects the economic recession that the country lives since 1998. This unequal decrease leads to a better distribution and a change in the expenditure structure where the portion of foodexpenses increase while the education and health ones reduces. In the paper we use descriptive statistics taking into acount the quantiles by region and zones (rural and urban). Then, we make parametric and non-parametric estimations of the Engel curve for each group of commodities in order to identify their nature.Gasto de los Hogares, magnitud, composición, distribución, curvas de Engel
Notes on family-group names for bees (Hymenoptera: Apoidea)
This is the published version.Corrected authorships and dates are provided for four family-group names for bees based on previously unrecognized earlier usages that made them nomenclatorially available. Sagemehl is newly recognized as the author of family-group names based on Dasypoda Latreille (Melittidae: Dasypodainae), Macropis Panzer (Melittidae: Macropidinae), and Hylaeus Fabricius (Colletidae: Hylaeinae), and Kawall as the author the family-group name based on Melitta Kirby, thereby taking precedence over the subsequent use of similar names by Börner, Robertson, Viereck, and Schenck, respectively. In addition, descriptions are provided for three new family-group taxa; Dieunomiini Engel, new tribe (Halictidae: Nomiinae), Eremaphantina Engel, new subtribe (Melittidae: Hesperapini), and Tarsaliini Engel, new tribe (Apidae: Apinae); and one new genus-group taxon, Eremaphantella Engel, new subgenus
Revision of the bee genus Chlerogella (Hymenoptera: Halictidae), Part IV: A new species from southwestern Colombia
This is the publisher's version, also available electronically from https://journals.ku.edu/index.php/melittology/article/view/4736.A new species of the diverse augochlorine bee genus Chlerogella Michener (Halictinae: Augochlorini) is described and figured from southwestern Colombia. Chlerogella anchicaya Engel, Gonzalez, & Hinojosa-Díaz, new species, is similar to C. agaylei Engel and C. materdonnae Engel, both occurring on the eastern slopes of the Andes in Ecuador. There are also some similarities with C. eumorpha Engel from the western Andean foothills in northern Ecuador, but differences in rostral length and male terminalia can distinguish these species. Revised couplets are provided to the South American species of Chlerogella to permit identification of the new species
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