442 research outputs found
Root hair anatomy and morphology in Posidonia oceanica (L.) Delile and substratum typology: First observations of a spiral form
No full textThe morpho-anatomical root hair features of P. oceanica ramets collected in meadows settled on different substrata (sand, matte and rock) were analysed. On each substratum, nine plagiothropic rhizomes each one composed by 3–6 interconnected short shoots were collected between April and May 2016 at 10 m of depth. On sand and on rock, the adventitious roots showed two distinct tubular and spiral-shaped hairs, clustered in yellowish-gray gelatinous pads. Tubular root hair tips were dactiliform and generally attached to grains of rock fragments. Moreover, a sub-circular swelling zone occurred. On matte, root hairs did not form gelatinous pads, were very short and had a simple distal portion. The root hair anatomy and morphology described here provides new information on the P. oceanica root system that can express a remarkable root hair polymorphism
Dissomphalus clovisi Colombo & Azevedo, sp. nov.
No full textDissomphalus clovisi Colombo & Azevedo, sp. nov. (Figs 9, 143, 144) Description. Male. Head and mesosoma black; metasoma dark castaneous or black. Mandible with two apical teeth; clypeus broadly projected forward, median tooth ill defined; frons weakly coriaceous, punctate. Pronotal disc coriaceous. T2 without tergal process. Posterior hypopygeal margin weakly concave. Genitalia: paramere wide in dorsal view, apex serrate, invagination serrate in ventral view, smaller than basiparamere; cuspis very wide; digitus sickle-shaped; aedeagal ventral ramus smaller than dorsal body, base narrow, wide middle part, apex narrow, laminar; aedeagal dorsal body with two pairs apical lobes, apex weakly bifurcated in dorsal view, inner pair weakly membranous; basal bar wide; apodeme extending beyond genital ring. Female unknown. Remarks. This species is allocated in amplus species-group by having the tergal process absent. This species not is similar other of species-group. This species is mainly different because has the aedeagal ventral ramus with wide middle part and apex narrow; aedeagal dorsal body with apex weakly bifurcated and aedeagal dorsal body with basal bar wide. Material examined. Types: Holotype Ƌ, BRAZIL, E[spírito] S[anto]: Santa Teresa, Est[ação] Biol[ógica] de Santa Lúcia, 26–29.VIII.2004, arm[adilha] Malaise, Tavares & equipe col. (UFES). Paratypes: 1Ƌ, Santa Maria de Jetibá, Fazenda Paulo Seick, 20º02’S 40º42’W, 06–13.XII.2002, armadilha Malaise, Tavares & Azevedo e eq[uipe] col. (UFES). Etymology. The epithet clovisi is in allusion to the father’s second author name Clovis. Distribution. Brazil (Espírito Santo).Published as part of Colombo, Wesley D. & Azevedo, Celso O., 2016, Review of Dissomphalus Ashmead, 1893 (Hymenoptera, Bethylidae) from Espíri- to Santo, Brazil, with description of twenty-one new species, pp. 1-84 in Zootaxa 4143 (1) on page 40, DOI: 10.11646/zootaxa.4143.1.1, http://zenodo.org/record/26075
Dissomphalus miriamae Colombo & Azevedo, sp. nov.
No full textDissomphalus miriamae Colombo & Azevedo, sp. nov. (Figs 12, 150, 151) Description. Male. Head and mesosoma black; metasoma dark castaneous or black. Mandible with two apical teeth; clypeus broadly projected forward, median tooth weakly rounded; frons weakly coriaceous and punctate. Mesosoma. Weakly coriaceous. T2 without tergal process. Posterior hypopygeal margin concave. Genitalia: paramere small in dorsal view, apex rounded, arched, smaller than basiparamere; cuspis wide; digitus wide; aedeagal ventral ramus smaller than dorsal body, apex ill defined, laminar, narrow; aedeagal dorsal body with one pair of apical lobes, inner pair with apex rounded in dorsal view, inner pair weakly serrate; basal process ill defined; apodeme extending beyond genital ring. Female unknown. Remarks. This species is allocated in amplus species-group by having the tergal process absent. This species not is similar other of species-group. This species is mainly different because has the aedeagal dorsal body with one pair of apical lobes and inner pair weakly serrate. Material examined. Types: Holotype Ƌ, BRAZIL, E[spírito] S[anto]: Santa Teresa, Est [ação] Biol [ógica] de Santa Lúcia, 28.III.2001, varredura, Azevedo & Kawada col. (UFES). Paratypes: 2Ƌ, Santa Teresa, Est [ação] Biol [ógica] de Santa Lúcia, 31.V.2001, 2♂, 27.IX.2001, varredura, Azevedo & Kawada col. (UFES); 1♂, Santa Maria de Jetibá, Fazenda Paulo Seick, 20º02’S 40º42’W, 29.XI–06.XII.2002, armadilha Malaise, Tavares & Azevedo e eq[uipe] col. (UFES); 1♂, Vitória, P [ar]q[ue] Est [adual] Fonte Grande, 30.VI.2001, varredura, Azevedo & Kawada col. (UFES). Etymology. The epithet miriamae is in allusion to the mother’s second author name Miriam. Distribution. Brazil (Espírito Santo).Published as part of Colombo, Wesley D. & Azevedo, Celso O., 2016, Review of Dissomphalus Ashmead, 1893 (Hymenoptera, Bethylidae) from Espíri- to Santo, Brazil, with description of twenty-one new species, pp. 1-84 in Zootaxa 4143 (1) on pages 41-42, DOI: 10.11646/zootaxa.4143.1.1, http://zenodo.org/record/26075
LIQUID COOLING FOR IMPROVED LED PERFORMANCE
No full textThe main issue concerning the power LEDs is the thermal power generated during operation, which increases the junction temperature affecting the operating characteristics of the power LED and casing the reduction of: the useful life of the components, the luminous flux, the light efficiency and the forward voltage. Moreover there is an increase of the fundamental wavelength of emitted light.
Purpose of this study is to compare the heat transfer performances of finned surfaces, which represent a commonly used passive techniques for heat removal in the field of lighting power LED, with an innovative liquid cooling placing the LED in an enclosure filled with dielectric refrigerant
Background Oriented Schlieren characterization of the thermal boundary layer over a vertical heated plate in free convection
No full textBackground Oriented Schlieren (BOS) is an optical technique that allows an indirect measurement of the temperature gradient in a flow field characterized by a not uniform distribution of the refractive index (Schlieren object). The operating principle is based on the dependence of this optical property on temperature. In particular, the refractive index gradient can be measured by comparing the images of a background pattern taken with and without the Schlieren object.
This method is particularly attractive, due to its simpler set-up and easier data reduction compared to other techniques based on the same principle.
As a first step toward the application of BOS to combustion problems and with the aim to verify its accuracy, a simple case has been investigated. The two dimensional thermal field over a vertical heated plate subjected to free convection has been measured and compared to the numerical solution obtained by Ostrach. A speckle pattern has been artificially generated and used as a background image. Temperature gradient has been measured by evaluating the speckle displacement occurring in the distorted background image. To this aim a cross-correlation algorithm used in PIV measurements has been applied. The temperature distribution obtained in the thermal boundary layer is in very good agreement with the Ostrach solution, while the deviation in the convective heat transfer coefficient lies within about 10%
From deep eutectic solvents to deep band gap systems
No full textThe optical properties of nine choline-based Deep Eutectic Solvents (DESs) of the type choline+X− (X− = chloride or acetate)/Y (Y = ethylene glycol, glycolic or levulinic acid) were studied by measuring their band gap through the UV-VIS-based Tauc method. All the considered systems showed a direct optical transition. A correlation between band gap and eutectic composition was discovered by plotting the variation of the band gap versus the molar fraction of choline+X−/Y in the parent systems containing 10 wt% of H2O. The main parameters influencing the energy of the optical transition in these “Deep Band Gap Systems” (DeBaGS) where studied through Design of Experiments (DoE) combined with multivariate analysis. The effect on the band gap of the anion (chloride or acetate), the acid (levulinic or glycolic), the water, and the stirring time, considered as single factor or in combination was clarified. Thus a multivariate model was implemented through surface responding analysis which allows engineering such kind of systems and opening to further applications in material science
Jean Miélot, bilan et perspectives
No full textThis article deals with Jean Miélot, famous author, translator, copyist, who was charged with “making books” for the Dukes of Burgundy between 1448 and 1470; it aims to update the bibliography of his activity (bilan, since 2010) and to suggest new “perspectives” for future research, particularly for critical editions of many of his works, still unpublished.Cet article se propose comme une mise à jour bibliographique sur Jean Miélot, célèbre auteur, traducteur, copiste, actif entre 1448 et 1470 auprès des ducs de Bourgogne. Ce «bilan» permet en même temps d’ouvrir de nouvelles «perspectives» de recherches, notamment dans le domaine des éditions critiques de nombre de ses œuvres, toujours inédites
Dissomphalus fredi Colombo & Azevedo, sp. nov.
No full textDissomphalus fredi Colombo & Azevedo, sp. nov. (Figs 3, 24, 77–80) Description. Male. Head and mesosoma black; metasoma dark castaneous. Mandible with two apical teeth. Median clypeal lobe trapezoidal, median tooth triangular. Frons strongly coriaceous, punctate. Pronotal disc strongly coriaceous. T2 with lateral pair of elliptical pits, bristles dense tufts present, their inner part of covered by translucid sclerite, so that hole hemispheric. Posterior hypopygeal margin weakly concave. Genitalia: paramere with apex rounded, slightly arched inward, very wide, specially basally; basivolsella wide projection, hemisphericshape; aedeagal ventral ramus longer than dorsal body, laminar, surface vertical, apex irregularly; aedeagal dorsal body with two pairs apical lobes, outer pair wide, rounded in lateral view, dorsal margin folded across its length, apical and ventral margins serrated, inner pair membranous and setose; apodeme not extending beyond genital ring. Female unknown. Variations. Tergal process with dense tufts or not; paramere with narrow apex. Remarks. This species is included in hemisphaericus species-group by having the tergal process hemisphericshaped with their inner part of covered by translucid sclerite. This species not is similar other of species-group. This species is mainly different because has the tergal process with bristles dense tufts and basivolsella with wide projection. This species goes to couplet 54 in the key proposed by Redighieri & Azevedo (2006) and should be read as: 54. Aedeagus not much wide, apex curved inward, outer dorsal body with corrugated surface and ventral margin strongly fringed, aedeagal ventral ramus narrow........................................................... D. undatus Azevedo - Aedeagus much wide or much short, apex not curved inward, outer dorsal body without corrugated surface and ventral margin weakly fringed, aedeagal ventral ramus wide.............................................................. 54a 54a. Posterior hypopygeal margin straight; paramere wider medially; aedeagal ventral ramus shorter than aedeagal dorsal body......................................................................................... D. gordus Azevedo - Posterior hypopygeal margin weakly concave; paramere very wide, specially basally; aedeagal ventral ramus larger than aedeagal dorsal body....................................................................... D. fredi sp. nov. Material examined. Types: Holotype Ƌ, BRAZIL, E[spírito] S[anto]: Domingos Martins, P [ar]q[ue] Est [adual da] Pedra Azul, 20º25’S 41º00’W, 26.VIII–2.IX.2003, Arm [adilha] Malaise, C.O. Azevedo & eq[uipe] col. (UFES). Paratypes: 4Ƌ, Santa Teresa, Estação Biológica de Santa Lúcia, 30.VII.2005 – 21.X.2014, [armadilha] Malaise, M. Tavares, C. Azevedo & eq[uipe] col. (UFES); 2♂, Santa Maria de Jetibá, Fazenda Clarindo Krüger, 20º04’S 40º44’O, 29.XI–13.XII.2002, armadilha Malaise, [M.T.] Tavares, [C.O.] Azevedo e eq[uipe] col. (UFES); 1Ƌ, Santa Maria de Jetibá, Fazenda Paulo Seick, 20º02’S 40º41’O, 29.XI–06.XII.2002, armadilha Malaise, [M.T.] Tavares, [C.O.] Azevedo e eq[uipe] col. (UFES); 9♂, same locality of holotype. 26.VIII–02.IX.2003, Arm [adilha] Malaise, C.O. Azevedo & eq[uipe] col. (UFES); 1♂, Domingos Martins, Pico do Eldorado, 20º22’S 40º39’W, 03– 10.XII.2004, [armadilha] Malaise, Tavares e equipe col. (UFES); 1♂, Ibitirama, Parque Nacional do Caparaó, 20º29’S 41º43’W, 10–14. III.2006, R. Kawada col. (UFES); 26♂, Ibitirama, Parque Nacional do Caparaó, 20º27’S 41º44’W, 16–23.III.2013, C.O. Azevedo & F.B. Fraga col. (UFES). Etymology. The epithet fredi is in allusion to the father’s first author name Frederico. Distribution. Brazil (Espírito Santo).Published as part of Colombo, Wesley D. & Azevedo, Celso O., 2016, Review of Dissomphalus Ashmead, 1893 (Hymenoptera, Bethylidae) from Espíri- to Santo, Brazil, with description of twenty-one new species, pp. 1-84 in Zootaxa 4143 (1) on pages 19-20, DOI: 10.11646/zootaxa.4143.1.1, http://zenodo.org/record/26075
Repercusiones Económicas surgidas por el Fenómeno del Contrabando en la Región Colombo – Venezolana.
No full text114 p.Colombia is a country that shares a border with Venezuela and four other countries. This allows them to present a very dynamic trade, where the primary objective was the economic benefit of the countries participating in the exchange. The case of the Colombian-Venezuelan border is unique. The difference in the purchasing power of the Venezuelan currency, the crisis by the lack of foreign exchange has generated an economic, political and social crisis where many residents have seen easy way out of this crisis, smuggling.
Smuggling is an offense under the Criminal Code, and is one of the main problems in the border region. Today this scourge is affecting the economy of both countries as they are being used as objects of that crime, food, medicines and products of the basic basket and constitute the staple items. Around this author he determined the purpose of analyzing the economic impacts arising from the phenomenon of smuggling in the region Colombo Venezolana Theorists contributions formed the basis of the investigation and that through consultation could deepen about the border issue. Also, I was investigated on the condition of the Venezuelan colombo region as smuggling, which has been the impact on the economy of both countries and finally the effects of smuggling in the formal and informal economy. This was a descriptive documentary research. As an idea to defend it suggests that border development should be taken as a national target, regardless of the situation of border that is in effect at a given time, purpose in which bilateral initiatives with neighboring countries can be an important part of the strategy to implement.Colombia es un pais que comparte frontera con Venezuela y cuatro paises mas. Esto permite que se presente un intercambio comercial muy dinamico, donde el objetivo primordial ha sido el beneficio economico de los paises participantes en dicho intercambio. El caso de la frontera colombo-venezolana es unico. La diferencia del poder dquisitivo de la moneda venezolana, la crisis por la ausencia de divisas ha generado una crisis economica, politica y social donde muchos de sus habitantes han visto como salida facil de esa crisis, el contrabando. El contrabando es un delito tipificado en el Código Penal, y constituye uno de los principales problemas en la region fronteriza. En la actualidad este flagelo esta afectando la economia de ambos paises, ya que se estan utilizando como objetos de ese delito, los alimentos, las medicinas y los productos de la cesta basica y que se constituyen en los articulos de primera necesidad. En torno a esto la autora determinó como propósito analizar las repercusiones economicas surgidas por el fenomeno del contrabando en la region Colombo Venezolana Los aportes teoricos, constituyeron la base de la investigación ya que a traves de su consulta se pudo profundizar sobre el tema del problema fronterizo. Igualmente, se investigo sobre la condicion de la region colombo venezolana en cuanto al contrabando, cual ha sido la incidencia en la economia de ambos paises y finalmente los efectos del contrabando en la economia formal e informal.
Se trató de una investigación documental de carácter descriptivo. Como idea a defender se plantea que el desarrollo fronterizo debe ser asumido como un objetivo nacional, independientemente de la situación de frontera que tenga vigencia en un momento dado, propósito en el cual las iniciativas bilaterales con los países limítrofes, pueden constituir parte importante de la estrategia a poner en práctica.CONTENIDO
Pág.
INTRODUCCIÓN 18
1. PROBLEMA 20
1.1 TITULO 20
1.2 PLANTEAMIENTO DEL PROBLEMA 20
1.3 FORMULACION DEL PROBLEMA 25
1.4 SISTEMATIZACION DEL PROBLEMA 25
1.5 OBJETIVOS DE LA INVESTIGACION 25
1.5.1 Objetivo General 25
1.5.2 Objetivos Especificos 26
1.6 JUSTIFICACION 26
1.7 DELIMITACION ESPACIAL 28
1.7.1 Frontera Colombo Venezolana: Tachira – Norte de Santander 28
1.7.2. Delimitación temporal 29
1.7.3 Delimitación Conceptual 29
2. MARCO REFERENCIAL 30
2.1 ANTECEDENTES 30
2.2 MARCO TEORICO 35
2.2.1 Entorno Macro economico 35
15
2.2.2 Contexto Comercial 36
2.2.3 Dinamica Comercial 37
2.2.4 El Contrabando Y El Patrimonio Publico 40
2.2.5 Evasión Fiscal 55
2.3 MARCO CONCEPTUAL 60
2.4 MARCO LEGAL 63
3. DISEÑO METODOLÓGICO 67
3.1 TIPO Y DISEÑO DE LA INVESTIGACIÓN 67
3.2 PROCEDIMIENTO 71
4. DIAGNOSTICO DE LA LA REGION COLOMBO VENEZOLANA EN CUANTO
AL FENOMENO DEL CONTRABANDO 75
4.1 RESEÑA HISTORICA DEL CONTRABANDO EN LA FRONTERA COLOMBO
VENEZOLANA 83
5. REPERCUSIONES ECONOMICAS A LAS QUE SE HAN ENFRENTADO
TANTO EL COMERCIANTE COLOMBIANO COMO EL VENEZOLANO A RAIZ
DEL FENOMENO DEL CONTRABANDO EN LA REGION COLOMBO –
VENEZOLANA 87
6. EFECTOS DEL CONTRABANDO EN LA ECONOMIA FORMAL E INFORMAL
6.1. LA VECINDAD COLOMBO VENEZOLANA DESDE LA PERSPECTIVA
ECONOMICA 92
16
6.2 CAUSAS DEL CONTRABANDO EN LA FRONTERA COLOMBO
VENEZOLANA 99
7. ARTICULO CIENTIFICO 100
CONCLUSIONES 101
RECOMENDACIONES 104
REFERENCIASEj. 1PregradoProfesional en Comercio Exterio
A Minimally Invasive and Highly Effective Extracorporeal CO2 Removal Device Combined With a Continuous Renal Replacement Therapy
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