103,084 research outputs found
Dark matter and stars
No full textDark matter is among the most important open problems in modern physics. Aimed at graduate students and researchers, this book describes the theoretical and experimental aspects of the dark matter problem in particle physics, astrophysics and cosmology. Featuring contributions from 48 leading theorists and experimentalists, it presents many aspects, from astrophysical observations to particle physics candidates, and from the prospects for detection at colliders to direct and indirect searches. The book introduces observational evidence for dark matter along with a detailed discussion of the state-of-the-art of numerical simulations and alternative explanations in terms of modified gravity. It then moves on to the candidates arising from theories beyond the Standard Model of particle physics, and to the prospects for detection at accelerators. It concludes by looking at direct and indirect dark matter searches, and the prospects for detecting the particle nature of dark matter with astrophysical experiments. • Describes the theoretical and experimental aspects of the dark matter problem • Presents observations, theory and experiments to give a complete and consistent understanding of dark matter • Features contributions from leading experts in the field
Alcune considerazioni relative alle caratteristiche psicosessuologiche del transessuale maschio: una ricerca clinica
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Thevenetimyia spinosavus Maass & Bertone, sp. nov.
No full textThevenetimyia spinosavus Maass & Bertone, sp. nov. Material examined. Holotype ♂: MADAGASCAR, Tuléar Province: Zombiste National Park near road, 22°50.43'S, 44°43.87'E, 822 m, 16–31 October 2002 (M. Irwin & R. Harin’Hala colls.), MAO 2-13 B-40. Diagnosis. Features that distinguish this fly from the only other Afrotropical Thevenetimyia species include: smaller size (~ 6.2 mm), terminal flagellomere with blunt tip, spine-like tubercles on scutellum (Fig. 4 B), body setae white or black (not golden), and features of the wing venation. TABLE]. ƂOmbyliiđae kŊOwŊ fľOm Mađagascaľ (MOđifieđ fľOm ŧhe World catalog of bee flies (Diptera: Bombyliidae), (EveŊhuis & Gľeaŧheađ, 2015b) aŊđ Tľue flies: The Ŋaŧuľal hisŧOľy Of Mađagascaľ, IľwiŊ et al., 2003) Subfamily Genus Species Afrotropical Types Available: Described by: Distribution EclimiŊae (buŧ see Thevenetimyia spinosavus Mađagascaľ HOlOŧype iŊ CAS Maass and Bertone, ŧhis sŧuđy Yeaŧes, 1995, TľauŧweiŊ 2011) TOxOphOľiŊae Geron candidulus Mađagascaľ HOlOŧype iŊ NHMƂ ƂOwđeŊ, 1974 dilutus Alđabľa, AsŧOve Is, HOlOŧype iŊ MNHN ƂOwđeŊ, 1974 COsmOleđO Is, Mađagascaľ varicapillis Mađagascaľ HOlOŧype iŊ NHMƂ ƂOwđeŊ, 1974 arcuata Mađagascaľ Type iŊ uŊkŊOwŊ cOllecŧiOŊ (OľigiŊally iŊ Macquaľŧ, 1847 đe Villeľs COllecŧiOŊ) flammicoma Mađagascaľ HOlOŧype iŊ MRAC FľaŊçOis, 1964 madagascariensis Mađagascaľ HOlOŧype iŊ ƂMNH Macquaľŧ, 1850 melanaspis Mađagascaľ 3 syŊŧypes iŊ ƂMNH Ƃezzi, 1924 nigrispina Mađagascaľ HOlOŧype iŊ ƂMNH Ƃezzi, 1924 vayssierei Mađagascaľ SyŊŧype iŊ MNHM Séguy, 1934 Heteralonia dolichoptera Mađagascaľ HOlOŧype iŊ ƂMNH Ƃezzi, 1924 (as Exoprosopa dolichoptera) Villa unifasciata Mađagascaľ, LecŧOŧype iŊ MNHN; Type iŊ uŊkŊOwŊ Macquaľŧ, 1840 (as Anthrax Mauľiŧius, RéuŊiOŊ, cOllecŧiOŊ (OľigiŊally iŊ đe Villeľs unifasciata) ROđľiguez COllecŧiOŊ); SyŊŧype iŊ NHRS Male. Head (Fig 3): Head slightly wider than thorax. Ocellar tubercle pronounced, rounded, covered in long black setae. Eyes holoptic. Antennae with three segments, length approaching length of head, black, and dusted with grey pollinosity; pollinosity dense on scape and pedicel, more diffuse on flagellum. Scape covered in black setae of varying lengths; pedicel covered in short black setae; flagellum without setae. Scape approximately two and one-half times length of pedicel. Flagellum slightly longer than scape, about as wide as previous segments, width even throughout, and with blunt tip. Buccal cavity deep, with setose swelling under anterior rim. Palpus halflength of proboscis, covered in gray pollinosity and black setae. Terminal segment of palpus slightly swollen at about midlength and with shorter setae than previous segment. Proboscis black, about two times as long as head. Face and occipital area with long black setae. Gena and lower portions of postgena with white setae (Fig. 4A). Thorax (Fig 4A and B): Mesothoracic scutum and scutellum dull black. Ground color of remaining thorax similar to scutum and scutellum, but with a dense dusting of grey pollinosity, especially on the pleura. Scutum with sparse, long black setae. Sparse, irregularly spaced, prominent spines on anterior half of scutum, becoming much smaller and sparser posteriorly (need high magnification to observe on posterior half). Anterior scutal spines often with an associated seta attached to base. Scutellum prominent, projecting over first abdominal tergite, and with numerous, small, spine-like tubercles, becoming more dense on posterior face (Fig. 4 B). Anepisternum densely covered with long black setae. Anepimeron, katepisternum, and ventral portion of anepisternum with patches of long white setae of varying density. Notopleural area just before wing base with three prominent black bristles (Fig. 4A). Wings (Fig. 5): Wings smoky brown, darker along costal margin and gradually fading posteriorly. Venation typical for genus Thevenetimyia. Costa with two rows of evenly spaced, spine-like setae along length, becoming more densely spaced but individually finer beyond intersection of veins C and R2+3. M1 ending in the wing margin. CuA and A each terminating separately at wing margin. Crossvein r-m placed before middle of cell dm. Calypter with mixture of long black and white setae. Halter elongate with light stem and dark brown knob. Legs: Coxae of front, mid and hind legs dull black with even gray pollinosity and covered sparsely with long white hairs (Fig. 4A). Front leg: Femur dark brown, bare, with long setae on the underside near trochanter. Tibia brown with sparse setae and spines becoming more dense apically. Tarsi dark brown and with dense black bristles. Mid leg: Femur dark brown, bare with very few long setae near trochanter. Tibia lighter brown with evenly distributed black bristles. Apex of tibia with prominent spurs. Tarsi dark brown and densely packed with black bristles. Hind leg: Hind legs notably longer than front and mid legs (similar to other members of genus Thevenetimyia). Femur dark brown with sparse black bristles and setae. Tibia lighter brown with evenly distributed black bristles. Apex of tibia with prominent spurs. Tarsi dark brown and densely packed with black bristles. All pulvilli well developed, slightly more than half the length of claws, white and with dense hairs. Claws simple (Fig. 6). Abdomen: About twice the length of thorax. Ground color of tergites dark brown with gray pollinosity on the lateral portion. Tergite I with predominantly long white hair. Tergite II with long dark brown hair. Amount of hair decreases drastically on lateral portion posteriorly to tergite IV. No other remarkable hairs on tergites V–VII. Sternites brown with white hair of varying lengths, predominantly short, found evenly throughout all sternites. Long black bristle-like setae present on epandrium and sternite VII. Black bristles do not continue onto cerci, although cerci have shorter hairs. Dissection of male genitalia was not conducted due to only one specimen being known (Fig. 6). Etymology. The name is a noun in apposition based on a combination of spinosus (Latin = “thorny”) and avus (Latin = “grandfather”), referring to the spines present on the scutum and scutellum, and the fly’s “elderly” appearance (many white hairs found on the body and grey pollinosity).Published as part of Maass, Natalia, Larmore, Zachary, Bertone, Matthew A. & Trautwein, Michelle, 2016, Description of a new species of Thevenetimyia (Diptera: Bombyliidae) from Madagascar, with a revised checklist of Madagascan bee fly fauna, pp. 57-66 in Zootaxa 4175 (1) on pages 59-65, DOI: 10.11646/zootaxa.4175.1.5, http://zenodo.org/record/16029
Recensione a A.N. Mancini, Lettura dei romanzi veneziani di G. Brusoni, "Forum italicum", VII, 1973.
No full textRecensione a G. Cassinelli, Cioiu de Mazu, Bologna, EDIM, 1970 e a M. Vassallo, Terra amara, Imperia, ESSE, 1977.
No full textEtching of InP-based MQW laser structure in a MOCVD reactor by chlorinated compounds
No full textFour different chlorinated compounds: 2-chloropropane, dichloromethane, chloroform and carbon tetrachloride have been used to etch InGaAsP/InP MQW laser structures partially masked. Etching experiments were performed in a home-made LP-MOCVD reactor with argon or argon+hydrogen as carrier gas, using phosphine (PH3) or tertiarybutylphosphine (TBP) to prevent thermal decomposition. The etching temperature as well as the chlorinated compound flow were varied to obtain the best trade-off between etch rate and surface morphology. The optimized experimental conditions were applied to etch mesa stripes in a SCH-MQW laser structure, for the first time to our knowledge, followed by lateral InP : Fe regrowth in the same step. Threshold current as low as 4 mA (best value)-6 mA (typical value) and differential quantum efficiency higher than 20% for SI-BH MQW laser have been achieved
Recensione a Furio Brugnolo, La Metrica delle poesie friulane di Pasolini, in Pier Paolo Pasolini. L'opera e il suo tempo, a cura di G. Santato, Padova, Cleup, 1983
No full textDynamical constraints on the dark matter distribution in the Milky Way
No full textAn accurate knowledge of the dark matter distribution in the Milky Way is of crucial importance for galaxy formation studies and current searches for particle dark matter. In this paper we set new dynamical constraints on the Galactic dark matter profile by comparing the observed rotation curve, updated with a comprehensive compilation of kinematic tracers, with that inferred from a wide range of observation-based morphologies of the bulge, disc and gas. The generalised Navarro-Frenk-White (NFW) and Einasto dark matter profiles are fitted to the data in order to determine the favoured ranges of local density, slope and scale radius. For a representative baryonic model, a typical local circular velocity v0=230 km/s and a distance of the Sun to the Galactic centre R0=8 kpc, we find a local dark matter density ρ0 = 0.420+0.021-0.018 (2σ) ± 0.025 GeV/cm3 (ρ0 = 0.420+0.019-0.021 (2σ) ± 0.026 GeV/cm3) for NFW (Einasto), where the second error is an estimate of the systematic due to baryonic modelling. Apart from the Galactic parameters, the main sources of uncertainty inside and outside the solar circle are baryonic modelling and rotation curve measurements, respectively. Upcoming astronomical observations are expected to reduce all these uncertainties substantially over the coming years
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