10,692 research outputs found
Análisis descriptivo del proceso de desmonte y habilitación de tierras en el Chaco Argentina
No full textLa República Argentina, aún con las discontinuidades institucionales y altibajos de un país en vías de desarrollo, ha logrado crear y mantener estructuras institucionales reguladoras del patrimonio ambiental a todos los niveles de la administración pública (Morello y Rodríguez, 2007). Hacia fines del siglo xx, los eventos vinculados con el ambiente más relevante a nivel nacional y regional habían sido: a) la creación, entre 1950 y 1975 de grupos de trabajo en ambiente acuático y terrestre auspiciados y financiados por CONICET, INTA y las Univ. Nacionales; b) El creciente interés en el Gran Buenos Aires monitoreo de la contaminación aérea en áreas industriales (partidos Avellaneda, Lanús, Quilmes, La Matanza); c) la elaboración de propuestas de desarrollo sostenible en zonas áridas elaborados por grupos técnico-científicos del INTA y por lo menos 4 universidades: Bahía Blanca, La Pampa, Comahue y Cuyo; d) manejo de sobrepastoreo e incendios en ambiente serrano, Univ. de Córdoba, Univ. de Santiago del Estero; e) análisis de ambiente humano (Fundación Bariloche y desde 1972 la Secretaria de Ambiente y Desarrollo Sustentable (en adelante SAyDS); f) climatología ambiental (SMN, INTA, SAyDS, UBA); g) degradación de ambientes de bosques nativos (Univ. de Córdoba, UNLP, Univ. Misiones, Univ. Tucumán, Instituto Forestal Nacional); h) ambientes agroproductivos y agroecología (UNCO, UBA, Univ. de Cuyo y fundamentalmente INTA); i) ambiente urbano (UNNE, FADU-UBA, Univ. Rosario); j) ambiente de pastizales y arbustales (UBA, Univ. Río Cuarto, INTA, Univ. de Córdoba, Univ. de La Pampa, Univ. de Bahía Blanca); k) ambientes protegidos para conservación de la biodiversidad APN, INTA, SAyDS, Univ. de Cuyo, gobiernos provinciales en especial Santiago del Estero, San Juan y Chubut; l) ambientes de bosque nativo y plantaciones de exóticas (Univ. Comahue, APN); m) restauración de ambientes naturales y seminaturales (APN, UNLP, Univ. de Comahue, Univ. de Córdoba, Univ. Cuyo; Univ. de Tucumán); n) ordenamiento territorial y planificación ambiental, (UNNE, UBA, Univ. de Tucumán); o) estudio y control de procesos erosivos periurbanos y rurales (INTA, APN, UBA, Univ. de Bahía Blanca)...Fil: Morello, Jorge Helios. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina. Universidad de Buenos Aires. Facultad de Arquitectura y Urbanismo. Grupo de Ecología del Paisaje y Medio Ambiente; ArgentinaFil: Rodriguez, Andrea Fernanda. Universidad de Buenos Aires. Facultad de Arquitectura y Urbanismo. Grupo de Ecología del Paisaje y Medio Ambiente; ArgentinaFil: Pengue, Walter Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina. Universidad de Buenos Aires. Facultad de Arquitectura y Urbanismo. Grupo de Ecología del Paisaje y Medio Ambiente; Argentina. Universidad Nacional de General Sarmiento; Argentin
Cryptodacus bernardoi Rodriguez & Rodriguez, new species
No full textCryptodacus bernardoi Rodriguez & Rodriguez, new species Figs. 1, 2, 5 –8, 14, 15, 19, 22, 23, 28 –31, 38– 42 Diagnosis. Modified couplets to the latter are provided to include C. bernardoi. It differs from all other species of Cryptodacus in the strongly sinuous shapes of the apical section of vein R 4 + 5 and crossvein dm-m. It differs from all other species except C. obliquus Hendel in lacking brown markings on the face; from all other species except C. trinotatus by the form of the sublateral postsutural vitta on the scutum, which is almost complete, but interrupted anterior to the intra-alar seta; and from other species except C. tau (Foote) by the entirely yellow abdominal syntergite 1 + 2 (Figs. 22, 23). Other useful diagnostic characters include: gena (Figs. 5, 6,) entirely yellow; posterior side of head yellow except lateral occipital sclerite with elongate brown spot; scutellum with base brown, brown area extended to basal scutellar seta; wing (Fig. 19) cell dm with basal and apical hyaline areas, discal band covering posterior part of crossvein dm-m, middle of dm-m without brown border; abdominal tergites 3–4 with broad brown bands, that on tergite 5 sometimes narrowly divided into 3 parts; oviscape yellow (Figs. 1, 20); aculeus tip with large serrations (Figs. 28–30). Description. Length 4.8 –5.0 mm. Mesonotum length 1.5–1.7 mm. Wing length 3.2–3.5 mm, width 1.3–1.5 mm, length/width ratio: 2.3. Measurements made on holotype female and one paratype male. Head (Figs. 5–8): Mostly pale yellow. Ocellar tubercle brown. Orbital plate with irregular brown stripe. Frons with pair of large dark brown spots aligned with and including base of middle frontal seta. 3 frontal setae; 2 orbital setae, well separated, distance between them 2.3–2.6 times distance from anterior seta to eye margin. Ocellar setae weak, 1.5 –2.0 times length of ocellar tubercle. Lunule entirely dark brown. Face entirely pale yellow, without brown spots; ventral margin strongly arched; gena and postgena entirely pale yellow. Posterior side of head entirely pale yellow except lateral occipital sclerite with elongate brown spot. Clypeus, prementum and palpus entirely yellow. Antenna with scape and pedicel yellow, first flagellomere dark yellow except moderate brown on apex, elongate, 4.5 –5.0 times as long as wide, apex flattened, in lateral view rounded. Arista short pubescent on distal half. Thorax (Figs. 14, 15): Mostly dark brown to black, with following whitish markings: postpronotal lobe and presutural lateral margin of scutum, connected to band on transverse suture; band on transverse suture (interrupted medially), extended across posterior part of notopleuron and posterior margin of anepisternum, almost reaching katepisternum; elongate spot on dorsal margin of katepisternum, not extending to katepisternal seta; single medial and paired sublateral postsutural vittae on scutum, medial vitta short, extended anteriorly almost to level of transverse suture, and posteriorly to midway between levels of acrostichal and dorsocentral setae, lateral vitta connected to band on transverse suture, extending almost to level of postalar seta but not reaching intra-alar seta; rectangular area posterior and lateral to intra-alar seta; and scutellum except base, brown part extending to and including base of basal scutellar seta. Scutum entirely microtrichose. Chaetotaxy normal for genus, postpronotal, 2 notopleural, 1 anepisternal, anepimeral, katepisternal, postsutural supra-alar, intra-alar, postalar, dorsocentral, acrostichal, and 2 scutellar setae well developed. Presutural supra-alar seta relatively small, half to two-thirds size of postsutural supra-alar seta. Dorsocentral seta aligned one-half to two-thirds distance from postsutural supra-alar seta to postalar seta. Legs mostly pale yellow, mid and hind coxae with small lateral brown areas, fore and mid tibiae pale brown, hind tibia dark brown, all tarsi pale brown. Wing (Fig. 19): With 4 bands: subbasal band, entirely brown, extended from cells bc and c to midlength of vein CuA+CuP, covering base of cell br, all of cells bm and bcu, and base of cell m 4 (except bordering fold); discal band, connected to subbasal band in cell c, curved posteriorly and extended to posterior wing margin distally in cell m 4, covering cell r 1 posterior to pterostigma, base of cell r 2 + 3, apex of cell br, crossvein r-m and posterior half of crossvein dm-m, dark brown anteriorly, from cell r 1 to middle of cell dm orange medially with broad, dark brown margins, posterior quarter paler brown; narrow, brown subapical band from distal part of cell r 1 to anterior end of crossvein dm-m, faint in cells r 1 and r 2 + 3; and narrow faint brown anterior apical band from distal part of cell r 2 + 3 to apex of vein M 1. Vein M 4 very narrowly bordered by brown between subbasal and discal bands. Cell dm with anterior apical corner hyaline. Crossvein r-m at 0.71 distance from bm-m to dm-m, entirely covered by dark brown distal margin of discal band. Crossvein dm-m and apical section of vein R 4 + 5 sinuous. Abdomen (female, Figs. 1, 22, male, Figs. 2, 23): Predominantly yellow, including all of syntergite 1 + 2. Tergite 3 with broad dark brown band. Tergite 4 and female tergite 5 with broad dark brown band or series of narrowly separated rectangular marks. Male tergite 5 laterally with paired ovoid brown marks, longer than wide, and medially with much smaller, inverted U-shaped brown mark or pair of brown spots. Female tergite 6 laterally with paired rectangular brown mark, medially usually with two small brown spots. Tergites with sparse black setulae. Female terminalia (Figs. 22, 28– 31): oviscape pale yellow, 0.89–0.92 mm long (n= 2). Aculeus (Fig. 28) 0.60 mm long, tip (Figs. 29, 30) 0.10 mm long, with apical 0.04 mm triangular and serrate, 0.05 mm wide, with 6–9 teeth on each side. Two spermathecae (Fig. 31) subcylindrical, with helical surface texture and elongate base. Male terminalia (Figs. 38–42): epandrium in lateral view wider than long, dorsally dark brown with black setulae, ventrally pale brown. Lateral surstylus in lateral view 3.5 times longer than wide, with glabrous, slightly curved elongated acute apex and distinct anteromedial lobe. Medial surstylus elongate two-thirds as long as lateral surstylus. Proctiger ovoid, entirely membranous, with sparse minute brown setulae. Distiphallus (Figs. 39, 41) moderately long and slender in ventral and lateral views, apex of internal tube bilobed. Type data. Holotype ♀ (IAvH), COLOMBIA: Cundinamarca: Anolaima, Vereda Santo Domingo, finca Villa Mariana [4.80171 °N 74.47542 °W], 1532 m, multilure trap, 3 Sep 2015, P. A. Rodriguez, A. L. Norrbom. Paratypes: COLOMBIA: Cundinamarca: Anolaima, Vereda Santo Domingo, finca Villa Mariana, 1532 m, multilure trap, 3 Sep 2015, P. A. Rodriguez, A. L. Norrbom, 1 ♂ (USNM); same locality, multilure trap, 21 Sep 2015, P. A. Rodriguez, 2 ♀ (ICAMF 00000044); same, multilure trap, 28 Sep 2015, P. A. Rodriguez, 2 ♀ (FSCA); same locality, reared from fruits of Phoradendron sp. near piperoides (Kunth) Trel., collected 13 Sep 2015, emerged 1 Oct 2015, P. A. Rodriguez, 1 ♂ 2 ♀ (USNM). Guaduas, Vereda el Raisal, predio el Cajón km 39 vía Bogotá-Guaduas [5 º07’09”N 74 º 57 ’02”W], 1421 m, McPhail trap 18, 22 Aug 2014, E. Quiroga, 1 ♂ 1 ♀ (ICAMF 00000045). Distribution. Cryptodacus bernardoi is known only from Colombia in Cundinamarca department in the municipios of Anolaima and Guaduas at middle altitudes on the west side of the eastern cordillera. Host plant. Three of the paratypes were reared from tiny fruits of Phoradendron sp. near piperoides (Kunth) Trel. (Figs. 43, 44), which was found parasitizing the upper part of a Psidium guajava L. shrub. This host plant is locally known by the common names “muérdago”, “matapalo”, “injerto” and “pajarito”. Phoradendron is variously classified in the Santalaceae or Viscaceae. The only previous host data for Cryptodacus was the single record of C. silvai Lima from fruit of “herva de passarinho” (Loranthus sp.) from southern Brazil (Lima 1947). The Loranthaceae, Santalaceae (and Viscaceae, when recognized as distinct from Santalaceae) belong to the order Santalales, many of which are parasitic plants. Etymology. This species is named for José Bernardo Rodríguez, father of the senior author. Comments. This species runs with difficulty in the keys of Norrbom (1994) and Norrbom & Korytkowski (2008). C. bernardoi may be most closely related to C. lopezi Norrbom, which has a similar aculeus, or it may belong to a clade along with that species and C. tau and trinotatus. The abdominal pattern is intermediate between those species, which have a distinct medial brown vitta or pair of vittae bordered by white or yellow sublateral areas on at least tergite 5 and female tergite 6, and the predominantly brown pattern in other species. In C. bernardoi the bands on tergites 4–5 in the male and 5–6 in the female may be interrupted. These four species also have the head mostly or entirely yellow posteriorly. The males were described only for C. bernardoi, C. obliquus, C. parkeri and C. tau.Published as part of Rodriguez, Pedro Alexander, Rodriguez, Erick J., Norrbom, Allen L. & Arévalo, Emilio, 2016, A new species and new records of Cryptodacus (Diptera: Tephritidae) from Colombia, Bolivia and Peru, pp. 276-290 in Zootaxa 4111 (3) on pages 277-279, DOI: 10.11646/zootaxa.4111.3.5, http://zenodo.org/record/26487
Comparison of contact and non-contact measurement systems for the position feed-back of a press with micrometric accuracy
No full textTwo Problems for Resemblance Nominalism
No full textIn this paper I raise a couple of objections against Rodriguez-Pereyra's version of resemblance nominalism. First, I argue that Rodriguez-Pereyra's solution to the so-called imperfect community difficulty is untenable. Second, I argue that Rodriguez-Pereyra's idea that sparse properties are bound to be lowest determinates, while determinable properties of any degree are to be treated as (infinite?) disjunctions of determinates, is liable to undermine the whole project
Notiospathius carmenae Rodriguez-Jimenez, sp. nov.
No full textNotiospathius carmenae Rodríguez-Jiménez sp. nov. (Figs 66–72) Diagnosis. This species can be distinguished from others by the following combination of characters. Frons smooth-very weakly coriaceous or smooth. Temple broad. Flagellum with annulus. Mesoscutal lobes granulaterugose along lateral edges. Mesoscutum medially with triangular rugose area or triangular rugose-costate area. Description female. Body length: 3.35 mm. Color. Head mainly honey yellow-brown. Eye orbits honey. Malar space honey yellow. Palpi pale yellow. Periocellar area brown. Scape yellow. Pedicel yellow with a wide longitudinal light brown stripe. Flagellum with apically yellow annulus composed of 7 flagellomeres. Flagellomeres before annuli honey yellow-brown. Mesosoma mainly dark brown. Lateral mesoscutal lobes dark brown. Median mesoscutal lobe dark brown. Venter of mesosoma dark brown. Pronotum brown to dark brown. Propodeum dark brown. First tergum brown-dark brown. Second tergum brown. Third tergum brown basomedially and apically with a transversal yellow stripe. Fourth tergum dark brown-yellow. Fifth tergum brown to dark brown. Sixth tergum dark brown to brown. Remaining terga brown except the last one, which is yellow. Fore and middle femur honey yellow. Fore and middle tibia honey yellow. Hind coxa dark brown with pale yellow apically. Hind trochanter yellow. Hind trochantellus yellow. Hind femur brown, with yellow at apex and base. Hind tibia yellow basally, and the remaining honey. Hind tarsi honey. Wings lightly dusky. Veins mainly brown. Tegula yellow. Stigma brown. Head. Clypeus smooth-weakly rugose. Head 0.80 x higher than wide. Face weakly transversely costate. Face minimum width/maximum width ratio 0.94. Frons smooth-very weakly coriaceous. Vertex transversely costate. Eye 1.25 x higher than wide. Ocell-ocular distance three diameter of lateral ocellus. Malar space 0.43 x eye height in lateral view. Temple/eye length ratio in dorsal view 0.71. Temple broad. Supraclypeal area 0.40 x head height in frontal view. Gena-temple area smooth. Scape 0.56 x first flagellomere length. Flagellomeres 25. Mesosoma. Pronotum rugose-granulate-smooth laterally and rugose ventrally. Pronotal groove distinct. Pronotal groove laterally scrobiculate-smooth. Propleuron with weakly scrobiculate area, weakly coriaceousweakly rugose, smooth ventrally. Mesoscutal lobes granulate-rugose along lateral edges. Notauli scrobiculate, not reaching the end of mesoscutum. Mesoscutum medially triangular rugose area. Scutellum (scutellar disc) coriaceous. Subalar groove distinct and scrobiculate-weakly coriaceous. Precoxal sulcus broad, deep and scrobiculate; length 0.79 mesopleuron length. Mesopleuron weakly rugose-weakly coriaceous-granulate dorsally, granulate medially and ventrally. Venter of mesosoma weakly coriaceous. Metapleuron rugose-areolate. Propodeum rugose-areolate. Propodeum with a median and two lateral longitudinal and complete carinae. Propodeal apico-lateral corners weakly tuberculate. Propodeal spine or tooth over hind coxa absent. Wings: fore wing. 2 RS/ 2 M ratio 0.44. Vein m-cu meeting vein RS+Ma distinctly before vein 2 RS. Vein (RS+M)b distinct. Vein (RS+M)b/ 2 RS ratio 0.33. Vein r 0.30 length of vein 3 RSa. Vein 1 cu-a interstitial to vein 1 M. Hind wing. Vein M+CU/ 1 M ratio 0.58. Vein m-cu nebulous. Vein cu-a 0.12 length of 1 M. Vein r-m/ 1 M ratio 0.31. Vein SC+R complete. Legs. Hind coxa dorsally costate-rugose. Ventral part of hind coxa weakly costate-weakly rugose. Hind coxa without basoventral tubercle. Hind coxa 0.50 length of hind femur. Femora without a rounded protrusion in dorsomedial view. Hind femur in dorsal view very weakly coriaceous-smooth. Metasoma. Basal sternal plate length/first tergum length ratio 0.80. First tergum 3.20 x longer than apical width. First tergum costate-rugulose. Second tergum weakly costate at base, remainder of terga smooth and polished. Third tergum smooth and polished. Suture between second and third tergum absent. Fourth tergum and remainder of terga smooth and polished. Ovipositor 1.50 mm long. Ovipositor 0.79 x length of metasoma. Ovipositor 1.67 x length of first tergum. Variation with respect to holotype. Females. Body length: 2.65–4.30 mm. Color. Eye orbits honey yellowbrown. Periocellar area brown-dark brown. Scape honey yellow with a weakly longitudinal light brown stripe. Annulus with 5–8 flagellomeres yellow apically. Flagellomeres before annuli honey yellow to dark brown. Mesosoma mainly black. Mesoscutal lobes black. Venter of mesosoma black. First tergum black-dark brown. Second tergum dark brown-brown. Third tergum dark brown-brown. Fourth tergum brown-dark brown. Fifth tergum brown. Sixth tergum brown. Fore and middle femur light brown. Hind femur yellow or honey basally, brown apically. Tegula honey. Head. Head 0.80–0.90 x higher than wide. Face minimum width/maximum width ratio 0.88–1.06. Frons smooth-very weakly coriaceous-weakly costate, or smooth-very weakly coriaceous-weakly rugose, or smooth. Vertex weakly transversely costate-smooth, or transversely costate-weakly rugose. Eye 1.17–1.30 x higher than wide. Ocell-ocular distance three diameter of lateral ocellus, or four diameter of lateral ocellus. Malar space 0.41– 0.51 x eye height in lateral view. Temple/eye length ratio in dorsal view 0.67–0.82. Supraclypeal area 0.40–0.50 x head height in frontal view. Scape 0.44–0.67 x first flagellomere length. Flagellomeres 22–29. Mesosoma. Propleuron with scrobiculate area-coriaceous-rugose-smooth. Notauli weakly scrobiculate. Mesoscutum medially triangular rugose-costate area. Scutellum (scutellar disc) granulate. Precoxal sulcus length 0.70–0.83 mesopleuron length. Mesopleuron weakly rugose-smooth-granulate dorsally and medially, weakly rugose-granulate ventrally. Venter of mesosoma coriaceous-weakly rugose-weakly coriaceous. Propodeum weakly rugose-rugose-areolate. Propodeal short tubercle at apical-lateral corners. Wings: fore wing. 2 RS/ 2 M ratio 0.37–0.51. Vein (RS+M)b/ 2 RS ratio 0.26–0.36. Vein r 0.20–0.30 length of vein 3 RSa. Hind wing. Vein M+CU/ 1 M ratio 0.50–0.71. Vein cu-a 0.11–0.24 length of 1 M. Vein r-m/ 1 M ratio 0.16–0.32. Legs. Hind coxa dorsally costate, or weakly costate-rugose. Ventral part of hind coxa costate-rugose, or rugose. Hind coxa 0.50–0.60 length of hind femur. Metasoma. Basal sternal plate length/first tergum length ratio 0.75–0.80. First tergum 3.04–3.94 x longer than apical width. Second tergum weakly costulate at base, remainder of terga smooth and polished. Ovipositor 1.25– 1.90 mm long. Ovipositor 0.67–0.90 x length of metasoma. Ovipositor 1.53–2.11 x length of first tergum. Male. Similar to female; flagellomeres before annuli dark brown, annulus with 1 yellow and 2 light brown flagellomeres. Head honey-honey yellow. Vertex weakly sculpture. Distribution. Colombia. Biology. Unknown. Material examined. Holotype female (IAvH). Colombia, Risaralda SFF Otún Quimbaya, Urapanera, 4 º 44 'N 75 º 35 'W, 1960m, Malaise, 27.x. 12 –xi. 2003, G. López Leg. M. 4194, IAvH-E 114256. Paratypes. Females (IAvH): one female, Colombia, Risaralda SFF Otún Quimbaya, Urapanera, 4 º 44 'N 75 º 35 'W, 1960m, Malaise, 08– 23.vii. 2003, G. López Leg. M. 4189, IAvH-E 114257; one female, Colombia, Quíndio Calarca Vda. Pradera Baja Fca. La Holanda. 4 º 33 ' 25 ''N 75 º 38 ' 21 '' W. 1575m, C. Winkler. 29.xi. 1999. E. González & J. Sossa Leg. IAvH-E 110656; one female, Colombia, Risaralda SFF Otún Quimbaya, Cuchilla Camino, 4 º 44 'N 73 º 35 'W, 1960m, Malaise, 19.vi– 7.vii. 2003, G. López Leg. M. 4198, IAvH-E 114252 and one female (ICN): Colombia, Vaupés R.N. Mosiro-Itajura (Caparú) Centro Ambiental, 1 º 4 'S 69 º 31 'W, 60m, Malaise 11.ii– 18.iii. 2003, J. Pinzón Leg. M. 3619, ICN 0 56056. Etymology. This species is named in honor of Andrea Rodríguez’s grandmother, Carmen Cadena.Published as part of Rodriguez-Jimenez, Andrea & Sarmiento, Carlos E., 2016, Taxonomic synopsis of Notiospathius Matthews & Marsh, 1973 (Hymenoptera: Braconidae) from Colombia, pp. 151-206 in Zootaxa 4132 (2) on pages 173-175, DOI: 10.11646/zootaxa.4132.2.1, http://zenodo.org/record/25760
Impact of Multiple Environmental Stresses on Wetland Vegetation Dynamics
No full textThis research quantifies the impacts of climate change on the dynamics of wetland vegetation under the effect of multiple stresses, such as drought, water-logging, shade and nutrients. The effects of these stresses are investigated through a mechanistic model that captures the co-evolving nature between marsh emergent plant species and their resources (water, nitrogen, light, and oxygen). The model explicitly considers the feedback mechanisms between vegetation, light and nitrogen dynamics as well as the specific dynamics of plant leaves, rhizomes, and roots. Each plant species is characterized by three independent traits, namely leaf nitrogen (N) content, specific leaf area, and allometric carbon (C) allocation to rhizome storage, which govern the ability to gain and maintain resources as well as to survive in a particular multi-stressed environment. The modeling of plant growth incorporates C and N into the construction of leaves and roots, whose amount of new biomass is determined by the dynamic plant allocation scheme. Nitrogen is internally recycled between pools of plants, litter, humus, microbes, and mineral N. The N dynamics are modeled using a parallel scheme, with the major modifications being the calculation of the aerobic and anoxic periods and the incorporation of the anaerobic processes. A simple hydrologic model with stochastic rainfall is used to describe the water level dynamics and the soil moisture profile. Soil water balance is evaluated at the daily time scale and includes rainfall, evapotranspiration and lateral flow to/from an external water body, with evapotranspiration loss equal to the potential value, governed by the daily average condition of atmospheric water demand. The resulting feedback dynamics arising from the coupled system of plant-soil-microbe are studied in details and species’ fitnesses in the 3-D trait space are compared across various rainfall patterns with different mean and fluctuations. The model results are then compared with those from experiments and field studies reported in the literature, providing insights about the physiological features that enable plants to thrive in different wetland environments and climate regimes
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Protocolo para la medición de la iluminación en el ambiente laboral de la Superintendencia de Riesgos de Trabajo: Aplicación y análisis de una propuesta complementaria
No full textA partir del análisis del marco legal vigente en Argentina en iluminación de espacios de trabajo y del protocolo desarrollado por la Superintendencia de Riesgos de Trabajo (SRT), se propuso un protocolo complementario (Protocolo LAHV). El objetivo de este trabajo fue comparar la aplicabilidad y poder de diagnóstico de ambos protocolos durante una Evaluación Post Ocupacional en siete locales de un edificio de oficinas. El protocolo LAHV permitió el relevamiento físico y fotométrico del espacio según el marco legal vigente, incorporando aspectos de la iluminación natural y de los puestos de trabajo, para alcanzar requerimientos de cantidad y calidad de iluminación en función del espacio, los ocupantes y los requerimientos de la tarea. El nuevo protocolo se presentó como una herramienta de evaluación y diagnóstico más eficaz, siendo un punto de partida para discutir los nuevos requerimientos legales a introducir en una futura modificación reglamentaria de la ley 19587.Fil: Rodriguez, Roberto Germán. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Conicet - Mendoza. Instituto de Ciencias Humanas, Sociales y Ambientales; ArgentinaFil: Pattini, Andrea Elvira. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Conicet - Mendoza. Instituto de Ciencias Humanas, Sociales y Ambientales; ArgentinaFil: Villarruel, C.. Universidad Tecnologica Nacional. Facultad Reg.mendoza
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