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Sample records for machines campo magnetico

Residual magnetic field in rotary machines; Campo magnetico residual en maquinas rotatorias

Energy Technology Data Exchange (ETDEWEB)

Gonzalez V, Esteban A; Apanco R, Marcelino [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

2007-07-01

The residual magnetism is a phenomenon in which the magnetic dipoles of a substance are oriented in a certain degree. On the other hand, when internal forces exist capable of aligning elementary magnetic dipoles of a material, a permanent magnet is obtained. Just as in a conductor or in a material, in the elements of a rotary electrical machine magnetic fields can be induced that produce a residual magnetism or magnetization. In the rotary electrical machines, the magnetization phenomenon causes serious problems, such as the generation of induced currents that propitiate the mechanical wear in bearings, collars, trunnions and inclusive in the shaft, by effects known as pitting, frosting and spark tracks, as well as erroneous readings in vibration and temperature sensors, that in some cases can cause the shut down of the machine. In this article are presented the general concepts on the residual magnetism in rotary electrical machines, the causes that originate it and the problems that arises, as well as the demagnetization of the components that have residual magnetic field. The results obtained by the area of Electrical Equipment of the Instituto de Investigaciones Electricas are revised, during the execution of activities related to the measurement and elimination of the residual magnetic field in rotary electrical machines. [Spanish] El magnetismo residual es un fenomeno en el que los dipolos magneticos de una sustancia se encuentran orientados en un grado determinado. Por otro lado, cuando existen fuerzas internas capaces de alinear los dipolos magneticos elementales de un material, se tiene un iman permanente. Al igual que en un conductor o un material, en los elementos de una maquina electrica rotatoria se pueden inducir campos magneticos que producen un magnetismo residual o magnetizacion. En las maquinas electricas rotatorias, el fenomeno de magnetizacion causa graves problemas, como la generacion de corrientes inducidas que propician el desgaste mecanico
Il campo magnetico terrestre

OpenAIRE

Meloni, A.; Winkler, A.

2004-01-01

La Terra si comporta come se fosse una grande calamita, in grado di influenzare l'ago magnetico delle bussole la quale si orienta approssimativamente verso Nord. La forza che agisce sull’ago, costringendolo ad assumere questa posizione, è generata dal campo magnetico terrestre.
Il nucleo terrestre: il cuore magnetico della Terra

OpenAIRE

De Santis, A.

2006-01-01

Il campo magnetico terrestre è una proprietà intrinseca del nostro pianeta e di altri oggetti del sistema solare. Il Sole stesso possiede un forte campo magnetico che si inverte quasi ciclicamente ogni 10-11 anni; tale comportamento è visibile attraverso la medesima ciclicità delle macchie solari che denotano sulla superficie l’intensa attività magnetica della nostra stella. Il campo magnetico terrestre è importantissimo per la vita sulla Terra. Esso protegge il pianeta dalle p...
The potential flow in presence of a magnetic field; El flujo potencial en presencia de un campo magnetico

Energy Technology Data Exchange (ETDEWEB)

Fierros Palacios, Angel [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

2001-02-01

From the Lagrangian formalism as in classical field theory, the partial differential field equations for the propagation of a small perturbation in a continuous and homogeneous conducting media in a magnetic field is obtained. The specific Lagrangian is calculated and it is shown that the equation of motion is the wave equation. Finally, the law of energy conservation is obtained. [Spanish] A partir de un formalismo lagrangiano, como el de la teoria clasica de campos, se obtienen las ecuaciones diferenciales de campo para la propagacion de un pequeno disturbio en un medio conductor continuo y homogeneo que se mueve en presencia de un campo magnetico uniforme. Usando el mismo marco teorico se obtiene la ecuacion de balance de energia. Se calcula la lagrangiana especifica y se demuestra que la ecuacion de movimiento es la ecuacion en onda. Ademas, se obtiene la correspondiente ley de la conservacion de la energia.
QCD phase diagram under an external magnetic field

Science.gov (United States)

Ferreira, Marcio Rafael Baptista

Neste trabalho e investigado o impacto de um campo magnetico externo na estrutura do diagrama de fases da Cromodinâmica Quântica (QCD). O estudo e realizado utilizando o modelo efetivo de Nambu-Jona-Lasinio para tres sabores acoplado ao loop de Polyakov (modelo de PNJL). A interacao de entanglement (modelo de EPNJL) na presenca de um campo magnetico e tambem estudada. Ambas as transicoes quiral e de desconfinamento na presenca de um campo magnetico externo podem ser analisadas usando os modelos de PNJL e EPNJL. Para o modelo de EPNJL e verificado que a coincidencia das temperaturas pseudocriticas de ambas as transicoes quiral e de deconfinamento dependem da parametrizacao da interacao de entanglement. E realizado um estudo sistematico do efeito de um campo magnetico externo nas transicoes quiral e de desconfinamento a potencial quimico barionico nulo, e.g., calculando a dependencia das temperaturas pesudocriticas com a intensidade do campo magnetico. O impacto de um campo magnetico externo no comportamento do quark estranho e analizado detalhadamente. E mostrado que a temperatura pseudocritica associada a transicao quiral do quark estranho e pouco sensivel a presenca de um campo magnetico externo. Alem disso, a sua grande massa corrente torna o quark estranho pouco sensivel ao termo de 't Hooft, contrariamente a forte influencia que tem nos quarks leves. Ambos os modelos de PNJL e EPNJL preveem o efeito de Catalise Magnetica a qualquer temperatura, mas nao reproduzem o efeito de Catalise Magnetica Inversa (CMI) em redor da temperatura pseudocritica de transicao, obtido em resultados recentes da LQCD. Mostramos que e possivel reproduzir a CMI se a intensidade da interacao entre quarks diminuir com o campo magnetico. Propomos dois mecanismos que reproduzem o efeito de CMI, que assumem o enfraquecimento da constante de acoplamento da interacao escalar com o aumento da intensidade do campo magnetico. O diagrama de fases e calculado para varios cenarios de isospin e
Inter-Diffusion of Plasma and Magnetic Fields in Pinch and Hardcore Discharges; Interdiffusion d'un Plasma et de Champs Magnetiques dans la Striction Rectiligne et la Striction Tubulaire; Vzaimnaya diffuziya plazmy i magnitnogo polya v pinch-razryadakh i razryadakh v tverdoj serdtsevine; Interdifusion Plasma-Campo Magnetico en Descargas de Estriccion y de Nucleo Rigido

Energy Technology Data Exchange (ETDEWEB)

Reynolds, P.; Lees, D. J.; Bickerton, R. J.; Hardcastle, R. A.; Wetherell, A. T.; White, B. M. [United Kingdom Atomic Energy Authority, Culham Laboratory, Abingdon, Berks. (United Kingdom)

1966-04-15

The inter-diffusion of plasma and magnetic field is studied in pinch and hardcore discharges in a large bore, linear discharge tube (TIBER). The variation with magnetic field configuration, initial pressure, peak current, pre-heat conditions and rise time is found. The rapid ('anomalous') field diffusion found in the pinch case is due to a hydromagnetic rather than an electrostatic instability. (author) [French] Les auteurs etudient l'interdiffusion d'un plasma et de champs magnetiques dans la striction rectiligne et la striction tubulaire, au moyen d'une chambre a decharge droite de grand diametre (TIBER). Ils en determinent les variations selon la configuration du champ magnetique, la pression initiale, le courant maximum, les conditions de preechauffage et le temps de montee. La diffusion du champ rapide (anormale) constatee dans le cas de la striction rectiligne s'explique par une instabilite hydromagnetique et non par une instabilite electrostatique. (author) [Spanish] Se estudia la interdifusion plasma-campo magnetico en descargas de estriccion y de nucleo rigido utilizando una camara lineal de descarga de gran diametro interno (TIBER). Se determina la variacion segun la configuracion del campo magnetico, la presion inicial, la intensidad maxima de corriente, las condiciones de precalentamiento y el tiempo de crecimiento. La rapida difusion de los campos ('difusion anomala') observada en el caso de la estriccion se debe mas a una inestabilidad hidromagnetica que a una electrostatica. (author) [Russian] Vzaimnaja diffuzija plazmy i magnitnogo polja issleduetsja v pinch-razrjadah i razrjadah v tverdoj serdcevine v linejnoj razrjadnoj trubke bol'shogo diametra (Tiber). Opredeljajutsja izmenenie konfiguracii magnitnogo polja, nachal'noe davlenie, pikovyj tok, uslovija predvaritel'nogo nagreva i vremja pod'ema. Pokazyvaetsja, chto bystraja (''anomal'naja'') diffuzija polja, ustanovlennaja pri pinche, imeet mesto skoree iz-za gidromagnitnoj, chem iz
IL CAMPO GEOMAGNETICO

Directory of Open Access Journals (Sweden)

F. MOLINA

1972-06-01

Full Text Available Questo lavoro non è un trattato sul campo geomagnetico e nemmeno
una rassegna sull'argomento, almeno nel significato che normalmente
si attribuisce al termine « rassegna »; esso è semplicemente
un tentativo di condensare in termini comprensibili agli studiosi non
specializzati ciò che oggi si sa o si ipotizza sul magnetismo terrestre
e sulle sue cause. Chi scrive si è sempre trovato a disagio di fronte
alle richieste di una spiegazione sull'origine del campo magnetico
terrestre: o si cerca di cavarsela con poche parole (« si tratta di correnti
elettriche indotte nell'interno della Terra » che possono forse accontentare
chi non si occupa in modo particolare di problemi scientifici
ma non possono soddisfare un fisico, oppure ci si sente obbligati a
tentare faticosamente di approfondire, sia per capirli personalmente
che per poterli poi spiegare agli altri, argomenti e ragionamenti che
sono in realtà accessibili solo a un fisico teorico ben preparato. Apparentemente
non esiste una via di mezzo, come del resto in molti altri
campi della fisica contemporanea.
La presente monografia rappresenta appunto il tentativo di trovare
questa via di mezzo: nel terzo capitolo, dedicato alle teorie sull'origine
del campo geomagnetico, si cerca di descrivere qualitativamente
i principali processi fisici proposti come sorgenti del campo,
dopo un accenno ai fondamenti fisici e matematici sui quali sono state
elaborate le varie teorie. Senza farmi soverchie illusioni di essere riuscito
nell'intento, mi dichiarerei tuttavia soddisfatto se questo lavoro
destasse sull'argomento l'interesse di qualche giovane ricercatore, incoraggiandolo
ad un approfondimento.
Calculation of electromagnetic field in electric machines through the finite element: Electromagnetic modeling; Calculo de campos electromagneticos en maquinas electricas mediante elemento finito: Modelacion electromagnetica

Energy Technology Data Exchange (ETDEWEB)

Rosales, Mario F [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1988-12-31

In this article are presented the general characteristics of the electromagnetic phenomena that can be described by means of the software CALIIE-2D of the Instituto de Investigaciones Electricas (IIE) derived from a modeling based in the magnetic and electric potentials, always using the MKS rationalized units system. Closed regions are considered with axial or moving symmetry to incorporate the bi-dimensional behavior of the electromagnetic fields. The possibility of means with movement is also included. [Espanol] En este articulo se presentan las caracteristicas generales de los fenomenos electromagneticos que pueden describirse mediante el programa de computo CALIIE-2D, del Instituto de Investigaciones Electricas (IIE), que provienen de una modelacion basada en los potenciales magnetico y electrico, en esta se utiliza sistema MKS racionalizado de unidades. Se consideran regiones cerradas con simetria axial o traslacional para incorporar el comportamiento bidimensional de los campos electromagneticos, se incluye tambien la posibilidad de medios con movimiento.
Calculation of electromagnetic field in electric machines through the finite element: Electromagnetic modeling; Calculo de campos electromagneticos en maquinas electricas mediante elemento finito: Modelacion electromagnetica

Energy Technology Data Exchange (ETDEWEB)

Rosales, Mario F. [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1987-12-31

In this article are presented the general characteristics of the electromagnetic phenomena that can be described by means of the software CALIIE-2D of the Instituto de Investigaciones Electricas (IIE) derived from a modeling based in the magnetic and electric potentials, always using the MKS rationalized units system. Closed regions are considered with axial or moving symmetry to incorporate the bi-dimensional behavior of the electromagnetic fields. The possibility of means with movement is also included. [Espanol] En este articulo se presentan las caracteristicas generales de los fenomenos electromagneticos que pueden describirse mediante el programa de computo CALIIE-2D, del Instituto de Investigaciones Electricas (IIE), que provienen de una modelacion basada en los potenciales magnetico y electrico, en esta se utiliza sistema MKS racionalizado de unidades. Se consideran regiones cerradas con simetria axial o traslacional para incorporar el comportamiento bidimensional de los campos electromagneticos, se incluye tambien la posibilidad de medios con movimiento.
Differential field equations for the MHD waves and wave equation of Alfven; Las ecuaciones diferenciales de campo para las ondas MHD y la ecuacion de onda de Alfven

Energy Technology Data Exchange (ETDEWEB)

Fierros Palacios, Angel [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

2001-02-01

In this work the complete set of differential field equations which describes the dynamic state of a continuos conducting media which flow in presence of a perturbed magnetic field is obtained. Then, the thermic equation of state, the wave equation and the conservation law of energy for the Alfven MHD waves are obtained. [Spanish] Es este trabajo se obtiene el conjunto completo de ecuaciones diferenciales de campo que describen el estado dinamico de un medio continuo conductor que se mueve en presencia de un campo magnetico externo perturbado. Asi, se obtiene la ecuacion termica de estado, la ecuacion de onda y la ley de la conservacion de la energia para las ondas de Alfven de la MHD.
Injection of Plasma Blobs into A Mirror Trap With Adiabatic Plasma Compression: ''ASPA'' Device; Injection d'Amas de Plasma dans un Piege a Miroirs avec Compression Adiaba Tique - Machine 'ASPA'; Inzhektsiya plazmennykh sgustkov v probochnuyu lovushku s adiabaticheskim szhatiem plazmy. Ustanovka ''ASPA''; Inyeccion de Plasmoides en una Trampa de Espejos con Compresion Adiabatica. La Instalacion 'ASPA'

Energy Technology Data Exchange (ETDEWEB)

Babichev, A. P.; Burjak, E. M.; Gorbunova, E. F.; Karchevskij, A. I.; Muromkin, Ju. A. [Institut Atomnoj Ehnergii, Im. I.V. Kurchatova, Moskva, SSSR (Russian Federation)

1966-04-15

presence d'un champ du type 'diverteur'. Sur la base de ces experiences, les auteurs montrent qu'il est possible d'eliminer les impuretes lourdes du plasma a l'aide d'une porte magnetique puisee qui cree des regions ou le champ magnetique est nul et ou les lignes de forces magnetiques rejoignent les parois de la chambre. Au cours des experiences preliminaires sur la compression adiabatique du plasma dans le piege a miroirs, les auteurs ont constate la presence de rayons X durs (de 30 keV) et etudie l'influence que le champ magnetique initial et les caracteristiques de l'amas de plasma exercent sur l'intensite et la durete de ces rayons. (author) [Spanish] En la memoria se explican las caracteristicas principales de la instalacion 'ASPA', construida para investigar la compresion adiabatica de un plasma en una trampa de espejo magnetico. La camara de vacio de la instalacion esta situada en un solenoide (4 m de longitud, 1 m de diametro)en cuyo eje puede crearse un campo magnetico cuasi estacionario longitudinal que actua de guia, de 5 kOe de intensidad maxima. Para generar el plasma de deuterio los autores utilizaron un inyector de titanio o un canon coaxial de plasma. Despues de ser inyectado a lo largo del eje de la instalacion, el plasmoide penetro en la region de compresion, formada por un tubo de vidrio de 10 cm de diametro. El campo magnetico pulsado, con una configuracion de espejo, se creo mediante dos bobinas situadas a 20 cm de distancia entre sf (la razon de espejo era de 1:2). La intensidad maxima del campo magnetico pulsado en los espejos era de 40 kOe, el tiempo de crecimiento del campo magnetico de Tilde-Operator 40 {mu}s, el tiempo de desintegracion del campo de 350 {mu}s. Los autores investigaron por espectrometria de masas la composicion y distribucion energetica del componente ionico del plasma en el. inyector de titanio y en el coaxial. Con ayuda de un interferometro de microondas midieron la densidad del plasmoide al pasar del inyector a la region de
Motion of Plasmoid in a Curvilinear Magnetic Field; Mouvement d'un Plasmoide dans un Champ Magnetique Curviligne; Dvizhenie plazmennogo sgustka v krivolinejnom magnitnom pole; Movimiento de un Plasmoide en un Campo Magnetico Curvilineo

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Vojcenja, V. S.; Gorbanjuk, A. G.; Onishhenko, I. N.; Safronov, B. G.; Hizhnjak, N. A.; Shkoda, V. V. [Fiziko-Tehnicheskij Institut, AN USSR, Khar' kov, USSR (Ukraine)

1966-04-15

-Operator 10{sup 12} cm{sup -3} and n{sub 2} Tilde-Operator 10{sup 13} cm{sup -3} et 7 x 10{sup 7} cm/s. La mesure photometrique des paraboles de Thompson a permis de determiner que l'energie moyenne des ions H+ etait superieure a 3 keV, les impuretes comptant pour environ 40%. Les principales impuretes etaient des ions carbone et oxygene et des ions des materiaux des electrodes-, leur energie moyenne etait superieure a l'energie moyenne des ions hydrogene. Au cours du deplacement du plasmoiede le long du solenoiede torique, l'energie transmise par le plasma et le nombre total des particules chargees ont diminue respectivement de 5 et de 3 fois pour H = 8000 Oe. En meme temps, dans le spectre des ions H{sup +} la fraction de particules rapides a diminue et l'energie moyenne est tombee a 2 ou 2,5 keV. La vitesse du front de densite n{sub i} est restee inchangee et la viteSse du front de densite ne est tombee a environ 4 * 10{sup 7} cm/s. Les impuretes dans le plasmoiede rapide (principalement les ions C{sup ++} et O{sup ++}) comptaient pour environ 5%. L'energie moyenne des ions d'impuretes passant par le champ torique etait environ la moitie de l'energie initiale (apres le passage dans le solenoiede rectiligne). (author) [Spanish] Los autores han estudiado teorica y experimentalmente el paso de un plasmoide a traves del campo magnetico de un solenoide toroidal y la eliminacion de las impurezas formadas por iones pesados. El analisis teorico se efectuo por aproximacion de deriva. El paso del plasma se consigue gracias a las 'corrientes de cortocircuito' cuya existencia habfa sido supuesta por K. D. Sinelnikov. Las comentes de cortocircuito reducen sustancialmente los campos de polarizacion, pero, como demuestran los calculos, no impiden la deriva de los iones pesados hacia las paredes de la camara. Incluso en plasmas densos, cuando 4{pi}n{sub 0}Mc{sup 2}/H{sup 2}{sub 0} >> 1, la deriva de los iones pesados se rige por las mismas leyes que la aproximacion de una sola particula
Meccanica quantistica teoria non relativistica

CERN Document Server

Landau, Lev Davidovich

1991-01-01

Concetti fondamentali della meccanica quantistica ; energia e quantità di moto ; equazione di Schrödinger ; momento angolare ; moto in un campo a simmetria centrale ; teoria delle perturbazioni ; cas quasi-classico ; spin ; particelle identiche ; l'atomo ; molecole biatomiche ; teoria della simmetria ; molecole poliatomiche ; composizione dei momenti angolari ; moto in un campo magnetico ; struttura del nucleo atomico ; urti elastici ; urt anelastici.
Fondamenti di fisica dei plasmi

CERN Document Server

Golant, V E; Sacharov, I E

1983-01-01

Introduzione ; collisioni del plasma ; equazioni cinetiche per particelle cariche ; plasmi in equilibrio termodinamico ; funzione di distribuzione di particelle cariche in un campo elettrico ; equazioni dei momenti della funzione di distribuzione ; processi di trasporto nel plasma in assenza di campi magnetici ; moto di particelle cariche nel plasma in presenza di campi magnetici ; processi di trasporto in campo magnetico ; confinamento del plasma mediante campi magnetici.
Project and analysis of the toroidal magnetic field production circuits and the plasma formation of the ETE (Spherical Tokamak Experiment) tokamak; Projeto e analise dos circuitos de producao de campo magnetico toroidal e de formacao do plasma do Tokamak ETE (Experimento Tokamak Esferico)

Energy Technology Data Exchange (ETDEWEB)

Barbosa, Luis Filipe F.P.W.; Bosco, Edson del

1994-12-31

This report presents the project and analysis of the circuit for production of the toroidal magnetic field in the Tokamak ETE (Spherical Tokamak Experiment). The ETE is a Tokamak with a small-aspect-ratio parameter to be used for studying the plasma physics for the research on thermonuclear fusion. This machine is being constructed at the Laboratorio Associado de Plasma (LAP) of the Instituto Nacional de Pesquisas Espaciais (INPE) in Sao Jose dos Campos, SP, Brazil. (author). 20 refs., 39 figs., 4 tabs.
Spettrometro e la segnatura muonica dell'esperimento OPERA

CERN Document Server

Di troia, Claudio

OPERA è un esperimento in fase di installazione presso i Laboratori Nazionali del Gran Sasso che investiga sulla apparizione di neutrino tauonico generato per oscillazione di sapore da un fascio di neutrini muonici inviati dal CERN verso il Gran Sasso: il fascio di long baseline CNGS. OPERA è dotato di 2 spettrometri per l'identificazione dei muoni, la determinazione del momento e l'assegnazione della carica. Sono riportati i risultati dello studio delle proprietà e delle performance degli spettrometri. Per il magnete dipolare sono mostrate le proprietà chimiche, meccaniche e magnetiche; le mappe di campo magnetico atteso sono state simulate e viene descritto come il campo magnetico possa venir monitorato durante la presa dati. Sono descritti i test (i controlli di qualità) eseguiti sui Resistive Plate Chambers, i rivelatori traccianti all'interno del magnete. I test hanno selezionato gli RPC con adeguate proprieta' meccaniche (tramite test pneumatici) ed elettriche (tramite test di condizionamento). Dal...
Electromagnetic fields originated by transmission power lines and the electromagnetic compatibility in shared rights of way; Campos electromagneticos producidos por lineas de transmision y la compatibilidad electromagnetica en derechos de via compartidos

Energy Technology Data Exchange (ETDEWEB)

Perez Rebolledo, Hugo; Zavala Silva, Moises; Galvan Diego, Arturo [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1999-12-31

This article describes the different types of electromagnetic interference by power lines in rights of way areas. The calculations of the electromagnetic fields obtained under a power line with the purpose of establishing acceptable interference limits, are shown. These calculations were conducted for different transmission power lines configurations. A good correlation was obtained among the measured magnetic fields and the calculated one under a power transmission line. For cases of fault currents to ground the ground potentials were estimated in order to obtain the minimum distance where buried pipes can be installed to operate in a safe way. [Espanol] Este articulo describe los diferentes tipos de interferencia electromagnetica producida por lineas de potencia en derechos de via. Se muestran los calculos de los campos electromagneticos obtenidos bajo una linea de potencia, con la intencion de establecer los limites aceptables de interferencia. Estos calculos se efectuaron para diferentes configuraciones de lineas de transmision. Se obtuvo una buena correlacion entre los campos magneticos medidos y el calculado bajo una linea de transmision. Para casos de corriente de falla a tierra se determinaron los potenciales a tierra, a fin de obtener la distancia minima en donde se pueden instalar las tuberias enterradas para operar de manera segura.
Electromagnetic fields originated by transmission power lines and the electromagnetic compatibility in shared rights of way; Campos electromagneticos producidos por lineas de transmision y la compatibilidad electromagnetica en derechos de via compartidos

Energy Technology Data Exchange (ETDEWEB)

Perez Rebolledo, Hugo; Zavala Silva, Moises; Galvan Diego, Arturo [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1998-12-31

This article describes the different types of electromagnetic interference by power lines in rights of way areas. The calculations of the electromagnetic fields obtained under a power line with the purpose of establishing acceptable interference limits, are shown. These calculations were conducted for different transmission power lines configurations. A good correlation was obtained among the measured magnetic fields and the calculated one under a power transmission line. For cases of fault currents to ground the ground potentials were estimated in order to obtain the minimum distance where buried pipes can be installed to operate in a safe way. [Espanol] Este articulo describe los diferentes tipos de interferencia electromagnetica producida por lineas de potencia en derechos de via. Se muestran los calculos de los campos electromagneticos obtenidos bajo una linea de potencia, con la intencion de establecer los limites aceptables de interferencia. Estos calculos se efectuaron para diferentes configuraciones de lineas de transmision. Se obtuvo una buena correlacion entre los campos magneticos medidos y el calculado bajo una linea de transmision. Para casos de corriente de falla a tierra se determinaron los potenciales a tierra, a fin de obtener la distancia minima en donde se pueden instalar las tuberias enterradas para operar de manera segura.
Fisica y vida cotidiana

CERN Multimedia

Méndez, R

2002-01-01

"Estaba harto de escuchar lo dificil que es ensenar fisica, interesar a los alumnos en gases, tiros parabolicos y campos magneticos. Por eso el profesor de Fisica de la Universidad de Murcia Rafael Garcia Molina decidio hace cinco anos dejar sin argumentos a sus colegas. Comenzo la busqueda de juguetes, regalos y objetos cotidianos para explicar la fisica" (1 page).
V Campos

Indian Academy of Sciences (India)

Home; Journals; Bulletin of Materials Science. V Campos. Articles written in Bulletin of Materials Science. Volume 37 Issue 1 February 2014 pp 157-166 Electronic Supplementary Material. Characterization of neutrophil adhesion to different titanium surfaces · V Campos R C N Melo L P Silva E N Aquino M S Castro W ...

Transverse Injection Experiment; Injection Transversale; Poslednie dostizheniya v oblasti inzhektirovaniya plazmy poperek magnitnogo polya; Inyeccion Transversal

Energy Technology Data Exchange (ETDEWEB)

Hammel, J. E.; Baker, D. A. [Los Alamos Scientific Laboratory, Los Alamos, NM (United States)

1966-04-15

points le long du courant de plasma permettent de determiner certaines des caracteristiques complexes du debit de plasma. (author) [Spanish] El movimiento de una corriente de plasma inyectada transversamente a un campo magnetico ha sido estudiado en varias ocasiones. En los primeros experimentos de inyeccion de un plasma rapido (50-70 cm/{mu}s) y denso (10{sup 14} iones/cm{sup 3}) transversalmente a un campo magnetico, los autores observaron un campo electrico de autopolarizacion y la corriente de plasma atravesaba el campo magnetico con una deriva del tipo E x B. El campo magnetico solo era ligeramente perturbado por la corriente de plasma (| {Delta}B/B | <0.1), mientras que la deriva a traves de campos magneticos hasta de 5 kGs tenia aproximadamente la velocidad de la comente inyectada. La altura de esta corriente de plasma, en la direccion de V x B se comprime a medida que va derivando a regiones de campo magnetico mas intenso. Al mismo tiempo, las mediciones de la densidad electronica, mediante procedimientos de interferometrfa con laser de He-Ne, indican que el campo transversal, que puede alcanzar a 7 kGs, no provoca una extension apreciable de la corriente de plasma en la direccion de B. Resulta interesante observar el comportamiento de la corriente al atravesar una region en la que las lineas del campo magnetico invierten su direccion alrededor de una lfnea de intensidad nula. Cuando la corriente atraviesa la lfnea que separa las dos direcciones el campo electrico tiene que cambiar de sentido para que pueda continuar la deriva de la corriente de plasma. La corriente se detiene en la region de la lfnea de separacion y se miden corrientes de gran intensidad a lo largo de las lineas del campo magnetico que conectan el frente de la corriente con las partes siguientes. Las mediciones preliminares del campo electrico efectuadas en varios puntos a lo largo de la corriente de plasma muestran algunas de las caracteristicas mas complejas de la circulacion de este. (author
Campo eletromagnético de uma carga em queda livre num campo gravitacional uniforme

OpenAIRE

Goto, Mario

2010-01-01

As transformações de Rindler são usadas para obter o campo eletromagnético de uma carga em queda livre num campo gravitacional uniforme. Electromagnetic field of free falling charge in an uniform gravitational field is obtained using Rindler transformations.
Some Aspects of Diffusion Theory

CERN Document Server

Pignedoli, A

2011-01-01

This title includes: V.C.A. Ferraro: Diffusion of ions in a plasma with applications to the ionosphere; P.C. Kendall: On the diffusion in the atmosphere and ionosphere; F. Henin: Kinetic equations and Brownian motion; T. Kahan: Theorie des reacteurs nucleaires: methodes de resolution perturbationnelles, interactives et variationnelles; C. Cattaneo: Sulla conduzione del calore; C. Agostinelli: Formule di Green per la diffusione del campo magnetico in un fluido elettricamente conduttore; A. Pignedoli: Transformational methods applied to some one-dimensional problems concerning the equations of t
Levantamento de Orchidaceae em quatro fragmentos de Campos de Altitude em Campos do Jordão, SP, Brasil

OpenAIRE

Gonçalves,Gabriel Franco; Sampaio,Daniela; Barros,Fábio de

2015-01-01

Orchidaceae é uma das maiores famílias das Angiospermas, sendo também uma das mais ricas e com mais alto grau de endemismo na Mata Atlântica, bioma que inclui a Floresta Ombrófila Mista e os Campos de Altitude, típicos da região de Campos do Jordão. Este trabalho teve como objetivo fazer um levantamento das espécies de Orchidaceae ocorrentes em quatro campos de altitude em uma Área de Proteção Ambiental pertencente ao Instituto Presbiteriano Mackenzie em Campos do Jordão, Estado de São Paulo,...
Video nueva herramienta del campo

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Manuel Calvelo Ríos

2015-01-01

Full Text Available El Video resulta ser una herramienta sumamente útil para el desarrollo rural. Entendemos por desarrollo rural el intento de regular las relaciones campo-ciudad en términos más equitativos para el hombre del campo. Es por tanto una decisión política.
Lezioni di fisica teorica

CERN Document Server

Caldirola, Piero

Richiami di meccanica analitica ; richiami di termodinamica ; richiami di elettromagnetismo ; appunti sulla teoria della relatività ; la non validità delle teorie classiche nel mondo microscopico ; la meccanica atomica di Bohr e Sommerfeld ; I fondamenti della meccanica quantistica ; applicazioni nell'equazione di Schroedinger ; meccanica quantistica dei sistemi l'atomo di idrogeno ; particella in un campo elettrico e magnetico ; il calcolo delle perturbazioni nella teoria quantistica ; teoria dell'emissione e dell'assorbimento della luce ; sistemi di particelle identiche ; il legame chimico omopolare nella molecola di idrogeno ; la teoria di Dirac.
TRABALHO DE CAMPO NO VALE DO JEQUITINHONHA: UMA POSSIBILIDADE DE APROXIMAÇÃO DA REALIDADE DO CAMPO

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Maria de Fátima Almeida Martins

2010-01-01

Full Text Available Este texto é fruto da experiência que tivemos na visita de campo ao Vale do Jequitinhonha(MG, lugar de referência e atuação de três educandos do curso de Licenciatura do Campo – Pedagogia da Terra –, integrantes da turma iniciada em dezembro de 2005, na Faculdade de Educação da UFMG. Essa turma marcou o início de nossas reflexões e nossa prática,com a formação e o ensino da Área de Ciências Sociais e Humanidades para professores que atuarão na educação do/no campo. Os relatos, as análises e as aproximações com os saberes e fazeres do campo apresentados aqui resultam das observações e do acompanhamento realizados nos locais de estágio dos referidos educandos. Estes residem 16TRABALHO DE CAMPO NO VALE DO JEQUITINHONHA: Revista Geografares, n° 8, 2010UMA POSSIBILIDADE DE APROXIMAÇÃO DA REALIDADE DO CAMPOnas cidades de Rio Pardo de Minas, Jequitinhonha e Almenara, mas suas práticas se realizam no campo, relacionada, respectivamente, à atuação do Sindicato dos Trabalhadores Rurais de Rio Pardo de Minas; do Centro de Agricultura Alternativa (CAA; da Caritas Diocesana, sediada em Jequitinhonha; e do Movimento dos Trabalhadores Rurais Sem Terra (MST, em Jequitinhonha e Almenara.
Temas de Física para Ingeniería: Campos escalares y vectoriales

OpenAIRE

Beléndez, Augusto; Bernabeu, Guillermo; Pastor Antón, Carlos

1988-01-01

Magnitudes, vectores y campos: "Campos escalares y vectoriales". Campo escalar y campo vectorial. Cálculo vectorial infinitesimal: operadores. Representación vectorial de una superficie. Integración de campos vectoriales. Relaciones entre los campos escalares y vectoriales. Clasificación de los campos vectoriales.
Anomalous behavior of a confined two-dimensional electron within an external magnetic field

Energy Technology Data Exchange (ETDEWEB)

Rosas, R; Riera R; Marin, J. L. [Universidad de Sonora, Hermosillo, Sonora (Mexico); Leon, H. [Instituto Superior Jose Antonio Echeverria, La Habana (Cuba)

2001-10-01

An anomalous diamagnetic behavior of a confined two-dimensional electron within an external magnetic field (perpendicular to the confining plane) is discussed in this letter. Although this finding is consistent with the pioneering work of Robnik, it has not been previously reported. When this effect occurs, the ratio between the typical length of spatial and magnetic confinement is an integer number. This property leads also to a quantization of the magnetic flux across the confining circle. The possible consequences of the peculiar behavior of the electron within such a structure are discussed. [Spanish] Se estudia una posible anomalia en las propiedades diamagneticas de un electron bidimensional confinado en presencia de un campo magnetico externo perpendicular al plano de confinamiento. Aunque los resultados obtenidos son consistentes con el trabajo pionero de Robnik, no han sido reportados anteriormente, a pesar de sus posibles aplicaciones, ya que cuando ocurre, el cociente entre la longitud magnetica y el tamano de la region de confinamiento es un numero entero, propiedad que establece una cuantizacion del flujo magnetico que atraviesa el circulo confinante. Se discuten las posibles consecuencias del comportamiento peculiar del electron en este tipo de estructura.
fernanda f campos

Indian Academy of Sciences (India)

Home; Journals; Journal of Biosciences. FERNANDA F CAMPOS. Articles written in Journal of Biosciences. Volume 42 Issue 4 December 2017 pp 657-664 Article. In vitro leishmanicidal, antibacterial and antitumour potential of anhydrocochlioquinone A obtained from the fungus Cochliobolus sp. FERNANDA F CAMPOS ...
Diffraction in the edge of a half plane in a bianisotropic media; Difraccion en el borde de un semiplano inmerso en un medio quiral bianisotropo

Energy Technology Data Exchange (ETDEWEB)

Villaroel, C; Torres, H.; Zamorano, M.; Obligado, A. [Universidad de Tarapaca, Arica (Chile)

2001-04-01

The diffraction of a non uniform plane electromagnetic wave by the edge of a electrically perfectly conducting half plane in a bi-anisotropic media is rigorously analyzed. The high-frequency asymptotic expansion reveals the existence of a coupling effect between a transverse magnetic (or transverse electric) incident plane wave and the transverse electric (or transverse magnetic) slope-diffracted field. A numerical verification using the Mathematic software is presented. [Spanish] Se analiza rigurosamente la difraccion, de una onda plana electromagnetica no-uniforme, en el borde (edge) de un semiplano perfectamente conductor inmerso en un medio quiral (bi-anisotropo). La expansion asintotica de la solucion exacta en alta frecuencia, evidencia la existencia de un efecto de acoplamiento, entre la onda plana transversal magnetica incidente (o transversal electrica) y el campo transversal electrico producido por la difraccion-pendiente (o transversal magnetico). Los campos difractados se evaluan numericamente utilizando el software Matematica.
¿CUÁNTO DURA UNA INVERSIÓN DEL CAMPO MAGNÉTICO TERRESTRE? Nuevos datos de la última inversión del campo magnético terrestre

OpenAIRE

Sagnotti, L.

2014-01-01

CUÁNTO DURA UNA INVERSIÓN DEL CAMPO MAGNÉTICO TERRESTRE? El campo magnético terrestre (o campo geomagnético) está generado por el movimiento complejo que tiene lugar en el núcleo externo de la Tierra. En su mayor parte, este campo es asimilable al que generaría una barra de imán situada en el centro del planeta.
METODOLOGÍA DE CONTROL DE MÁQUINAS ELÉCTRICAS DE IP CON CAPACIDAD DE DEBILITAMIENTO DE CAMPO CONTROL METHODOLOGY OF PM MACHINE WITH FIELD WEAKENING CAPABILITY

Directory of Open Access Journals (Sweden)

Delvis González L

2007-04-01

Full Text Available En el mundo actual los requerimientos de los accionamientos se hacen cada vez más exigentes en cuanto a precisión y eficiencia. Por esta razón los diseñadores se ven obligados a encontrar nuevas topologías y mecanismos de control que las satisfagan, especialmente para aplicaciones de velocidad variable como tracción eléctrica. Las máquinas sincrónicas de imanes permanentes son una solución atractiva debido a su elevada eficiencia y su gran densidad de potencia. En estas aplicaciones, para velocidad por debajo de la nominal, el accionamiento opera a torque constante siguiendo la trayectoria de máximo par por ampere. Para valores de velocidad por encima de la nominal es necesario inyectar un flujo negativo en el eje directo, para reducir el flujo impuesto por el imán. De esta manera el voltaje y la corriente se mantienen en 1.0 pu. Este efecto se logra con un control adecuado del ángulo de la corriente en los ejes dq. Este trabajo muestra un método de control para operar las máquinas de corriente alterna e imanes permanentes con capacidad de debilitamiento de campo. Utilizando el Simulink del Matlab se verifica la estrategia de control propuesta. Además se muestran las propiedades de una nueva topología de MCAIP para aplicaciones de velocidad variable.Presently the AC machine drive’s requirements are more demanding in terms of precision and efficiency. Under these circumstances, designers are forced to find new machine topologies and control methods to meet these conditions, especially for variable speed applications such us electric traction. PM machines are an attractive solution because of their intrinsic higher efficiency and their power density. For these operations - below the rated speed - the drive works under constant torque strategy following the maximum torque per ampere trajectory. For speeds over the rated value, it is necessary to inject a negative d-axis flux, to reduce the field imposed by the PM. In this manner
Angiosperm disjunction "Campos rupestres - restingas": a re-evaluation Disjunção de Angiospermas Campos Rupestres - Restingas: uma reavaliação

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Ruy José Válka Alves

2007-09-01

Full Text Available A disjunct distribution pattern between the extrazonal formations of the campos rupestres (rocky grasslands in the Espinhaço mountain range and the restingas (coastal strand vegetation in Brazil has been proposed repeatedly for several flowering-plant species. In order to validate this distribution pattern, available data from the literature and major herbaria were compiled and evaluated. Some of these species also occur in campos rupestres on mountain ranges in Goiás state, campos de altitude (high altitude grasslands of the Serra do Mar, and on geologically homologous rocky formations of the Guyana shield. Species that were also recorded for distinct zonal formations like cerrado, caatinga and forests were excluded from the pattern. The campo rupestre-restinga disjunction proved valid for 9 of 56 investigated species (16%. Explanations put forth by different authors for this unusual disjunction pattern are compared in the light of geological and climatological evidence.Um padrão de distribuição disjunta entre as formações extrazonais conhecidas por campos rupestres na cadeia do Espinhaço e as restingas do litoral brasileiro vem sendo repetidamente proposto para algumas espécies de fanerógamas. Para averiguar a validade deste padrão, foram reunidos dados disponíveis em literatura e nos principais herbários. Verificou-se que algumas espécies aparecem adicionalmente nos campos rupestres das Serras de Goiás, campos de altitude da Serra do Mar, em formações rupestres geologicamente homólogas do Escudo das Guianas. Foram excluídas do padrão as espécies cuja ocorrência foi verificada também em vegetação zonal, tal como cerrado, caatinga e matas. O padrão campo rupestre-restinga se mostrou válido para 9 de 56 espécies investigadas (16%. As razões apresentadas por distintos autores para explicar este padrão peculiar de disjunção são comparadas à luz de evidências geológicas e climatológicas.
Augusto de Campos tradutor de Emily Dickinson

Directory of Open Access Journals (Sweden)

Fernanda Maria Alves Lourenço

2015-04-01

Full Text Available http://dx.doi.org/10.5007/2175-7968.2015v35n2p161 Este artigo objetiva analisar a tradução de duas poesias de Emily Dickinson (1830-1886 realizada por Augusto de Campos (1931 e publicada em 2008 na coletânea Emily Dickinson: Não sou ninguém. Inicialmente serão apresentados alguns elementos da poética de Dickinson, a partir de Gilbert e Gubar (1984, Donoghue (1969, Sewall (1963 e Daghlian (1987. Em seguida, será dada ênfase à figura de Augusto de Campos como poeta e como tradutor, com ênfase nos seus comentários sobre tradução, visando compreender sua prática tradutória. (CAMPOS, 2004; 2006; 2008 Por fim, será analisada a tradução de duas poesias de Dickinson realizada por Augusto de Campos, buscando identificar a relação entre a teoria e a prática do tradutor. Essa análise, de caráter discursivo, além do plano formal e sintático, busca verificar o plano semântico dos textos, e ressalta que não tem a pretensão de realizar qualquer tipo de julgamento prescritivo.
Densidade populacional de raposa-do-campo Lycalopex vetulus (Carnivora, Canidae em áreas de pastagem e campo sujo, Campinápolis, Mato Grosso, Brasil

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Ednaldo C. Rocha

2008-03-01

Full Text Available Diante da crescente descaracterização do Bioma Cerrado em função da expansão da fronteira agropecuária na região central do Brasil, torna-se importante avaliar a capacidade de adaptação das espécies ao ambiente antropizado. Neste sentido, este trabalho foi desenvolvido com o objetivo de estimar e comparar a densidade populacional da raposa-do-campo Lycalopex vetulus (Lund, 1842 em duas áreas com diferentes graus de alteração, pastagem e campo sujo, em Campinápolis, Mato Grosso. Para tanto, no período entre agosto a novembro de 2005, foram efetuados censos noturnos ao longo de transectos lineares, totalizando percursos de 129,8 km na área de campo sujo e 62,08 km na área de pastagem. Estimativas de densidade populacional foram geradas utilizando o programa Distance 5.0, sendo que o modelo e ajuste mais adequados aos dados foram half-normal + hermite. Foram obtidas 23 e 52 detecções de raposas-do-campo nas áreas de campo sujo e pastagem, respectivamente. A densidade populacional de raposa-do-campo na área de pastagem (D=4,28 indivíduos/km²; IC=2,69 - 6,82 foi maior que na área de campo sujo (D=1,21 indivíduos/km²; IC=0,73 - 2,01, fato que deve estar relacionado, principalmente, com a disponibilidade de alimento e redução de potenciais predadores. Por apresentar uma dieta composta principalmente de cupins, especialmente os dos gêneros Syntermes e Cornitermes, a raposa-do-campo encontra na área de pastagem uma base alimentar abundante e estável. Além disto, a simplificação ambiental, em função da implantação de pastagens acaba por reduzir, ou até mesmo eliminar, animais que são potenciais predadores de raposas-do-campo, como Chrysocyon brachyurus (Illiger, 1815, favorecendo o aumento da densidade populacional da espécie neste tipo de ambiente. Por fim, características adaptativas apresentadas pela raposa-do-campo têm permitido que esta espécie sobreviva, inclusive apresentando elevada densidade
Educação do Campo e o programa Projovem Campo em Planaltina/DF

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Marina Morenna Alves Figueiredo

2017-07-01

Full Text Available A Política Nacional de Juventude (PNJ demonstra o reconhecimento do Governo sobre a necessidade de políticas sociais específicas para este segmento. Dentre as diversas políticas para a juventude, a presente pesquisa buscou retratar o Programa Projovem Campo, na área de educação, destinado a promover a conclusão do ensino fundamental dos jovens, de 18 a 29 anos, que já deveriam ter concluído tal etapa. Para elucidar a importância desta política pública foi realizado um estudo de caso no Centro de Ensino Fundamental Pipiripau II, na zona rural de Planaltina/DF e foram feitas entrevistas com os gestores, coordenadores, professores e estudantes do Programa Projovem Campo nesta unidade de ensino. Os resultados do trabalho de campo indicaram dificuldades na implementação e execução do programa. Entre as principais dificuldades destacam-se o não cumprimento de ações estabelecidas no desenho da política, como a refeição oferecida que não era jantar, as rotas dos ônibus e o impedimento de transportar crianças, a falta de um espaço específico e de materiais para a sala de acolhimento, além do não pagamento da bolsa auxílio para os estudantes.
QUAL O FUTURO DAS ESCOLAS NO CAMPO?

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Célia Regina Vendramini

2015-09-01

Full Text Available RESUMO:Tendo como ponto de partida a questão sobre o futuro das escolas rurais ou do campo, o artigo aborda o contexto social, político e econômico que suporta ou não a existência das escolas, bem como uma análise sobre a situação das escolas em diferentes contextos, particularmente no Brasil, em Portugal e nos Estados Unidos. Problematizamos as respostas dadas pelo poder público, acadêmicos e organizações e movimentos sociais sobre o fechamento, a redução do número de alunos e de comunidades rurais com escola, as condições de funcionamento, a distância percorrida pelos alunos, além das implicações das escolas para a vitalidade do campo. Concluímos que o futuro das escolas está diretamente relacionado com o futuro do campo.
A psicologia e a constituição do campo educacional brasileiro

OpenAIRE

Sganderla, Ana Paola; Carvalho, Diana Carvalho de

2010-01-01

O presente artigo tem por objetivo discutir como a Psicologia contribuiu para a formação do campo educacional brasileiro início do século XX. Ao mesmo tempo, o campo educacional forneceu elementos fundamentais que serviram de base à constituição dessa ciência como campo científico reconhecido no País. Como base teórica para a investigação, utilizamos o conceito de campo social de Pierre Bourdieu, relacionando as implicações práticas presentes nesta constituição: Intelectualidade influente; es...
Campo magnético generado por N bobinas alineadas axialmente

OpenAIRE

César Gutiérrez Tapia; Javier González Damián

2002-01-01

El cálculo del campo magnético generado por n bobinas axialmente alineadas permanece como un importante problema técnico en el proceso de construcción de los diferentes dispositivos para confinar el plasma con perfiles de campo externo tipo espejo. A partir de los métodos numéricos existentes para el cálculo de las integrales elípticas de primera clase k y segunda clase e, se describe la obtención de expresiones simples para calcular el campo magnético por el método de las ecuaciones elíptica...

La tradición del trabajo de campo en Geografía

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Perla Zusman

2011-01-01

Full Text Available El trabajo de campo ha adquirido distintas significaciones a lo largo de la historia de la Geografía. Los cambios en la concepción de la Geografía han derivado en redefiniciones de la contribución del trabajo de campo al proceso de producción de conocimiento. El objetivo de este texto es aproximarse a los aspectos epistemológicos y políticos presentes en las distintas formas de entender el trabajo de campo. A su vez, se busca mostrar que las diversas maneras de concebir y hacer el trabajo de campo conviven en la actualidad
Macrorrealismo fenomenológico e campos-experiência

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Renato Schaeffer

1995-01-01

Full Text Available Este artigo critica a concepção predominante, representacionista-neurofisicalista sobre a percepção sensorial. Introduz a noção de "campo-experiência" na tentativa de tratamento ontológico dos dados fenomenológicos da experiência. A idéia geral é que a experiência visual, por exemplo, seria ontologicamente algo assim como um campo-experiência de intencionalidade visual, que se estende por sobre e entre o sistema nervoso central do sujeito da experiência e o objeto distai da visão. Chamo esta posição de macrorrealismo fenomenológico, em contraste com o microrrealismo científico. Qualidades da fenomenalidade não estão subjetivamente dentro do cérebro, mas objetivamente dentro de campos-experiência perceptuais extra-encefálicos, ou, como dizemos, lá fora no mundo. Algumas conseqüências específicas do macrorrealismo fenomenológico são apresentadas.
76 FR 6153 - Supplemental Environmental Impact Statement for the Proposed Campo Regional Landfill Project on...

Science.gov (United States)

2011-02-03

... for the Proposed Campo Regional Landfill Project on the Campo Indian Reservation, San Diego County, CA... proposed Campo Regional Landfill Project (Proposed Action) to be located on the Campo Indian Reservation... Landfill Project (Proposed Action). There is no Federal action of amended lease and amended sublease...
Divagaciones: la ciudad, el campo, la comunicación

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Gustavo M. Quesada

2015-01-01

Full Text Available Espero plantear algunos puntos para un debate de tiroteo entre el alcalde y un pequeño propietario la comunicación rural en una perspectiva de rural. Me pregunto, ¿es esto desarrollo? integración campo-ciudad. En estos puntos se En la integración campo-ciudad es necesario anotarán las diferencias del campo y de la ciudad. Su comprender que, en la mayoría de los casos, el explicación requerirá elaboraciones teóricas y campo lleva todas las probabilidades de perder. La metodológicas particulares. Al hablar de tecnología de producción, las determinaciones sobre comunicación rural, hay que considerar que la política agrícola y las operaciones de descripción de sus problemas alude a otros campos comercialización se realizan en la ciudad bajo su del conocimiento que podrían tratarse ampliamente influjo. Cubriré este debate bajo el prisma de como comunicación de las minorías o comunicación educador / comunidad rural. popular. Quizá así se pueda aspirar a un desarrollo pesar de que el área que abarca la que sirva para evitar nuevos suicidios o tiroteos enseñanza de la comunicación ha sido causados por errores tecnológicos. y a propósito de últimamen te una de las más, fértiles, citaré suicidios y tiroteos allá van dos hechos que mucho aquí como punto de referencia solamente me impresionaron.
A modelagem científica vista como um campo conceitual

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Rafael Vasques Brandão

2011-01-01

Full Text Available http://dx.doi.org/10.5007/2175-7941.2011v28n3p507 Este trabalho defende a tese de que o processo de modelagem científica pode ser visto como um campo conceitual subjacente ao domínio de campos conceituais específicos em Física e possui implicações relevantes para o Ensino de Física e a pesquisa nessa área centrados na estratégia didática da modelagem. Para tanto, apoia-se na visão epistemológica de Mario Bunge sobre modelagem científica e na Teoria dos Campos Conceituais de Gérard Vergnaud, levando em conta as ideias de Weil-Barais e Vergnaud sobre concepções em Física.
Processo de trabalho em saúde mental e o campo psicossocial El proceso de trabajo en salud mental y el campo psicosocial Work process in mental health and the psycosocial area

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Ana Luisa Aranha e Silva

2005-06-01

Full Text Available Trata-se de reflexão teórica sobre os determinantes e os elementos constitutivos do processo de trabalho da enfermagem no campo psiquiátrico e no campo psicossocial no contexto da Reforma Psiquiátrica brasileira. O objetivo é oferecer conteúdo teórico-conceitual para orientar a ação reflexiva de trabalhadores em saúde mental e, em particular, da enfermagem. A finalidade do artigo é preservar a memória da prática da enfermagem no campo psiquiátrico e promover sua necessária superação com vistas à construção do campo psicossocial, subsidiando o ensino nos diversos campos de saber em saúde.Se trata de una reflexión teórica acerca de los determinantes y elementos constitutivos del proceso de trabajo de enfermería en el campo psiquiátrico y psicosocial en el contexto de la Reforma Psiquiátrica brasileña. El objetivo es ofrecer subsidios teórico-conceptuales para orientar la acción reflexiva de enfermeros y demás trabajadores de la salud mental. Este articulo tiene como finalidades preservar la memoria de la práctica de enfermería en el campo psiquiátrico y promover la superación necesaria, con vistas a la construcción del campo psicosocial, ofreciendo subsidios para la enseñanza en los diversos campos del saber en salud.We present a theoretical reflection about determinants and constitutive elements of the nursing work process in the psychiatric and psychosocial areas, in the context of the Brazilian Psychiatric Reform. The aim is to offer theoretical and conceptual guidance with a view to mental health workers' reflexive action, particularly in nursing. The purpose of this article is to preserve the memory of nursing practice in psychiatry and to go beyond, with a view to constructing the psychosocial area, supporting teaching in all fields of health knowledge.
Sociedade e cultura portuguesas II : a cidade e o campo

OpenAIRE

Catroga, Fernando; Carvalho, Paulo Archer de

2000-01-01

Académico - Licenciaturas A cidade e o campo, um jogo dicotómico evidenciando características que por um lado eram associadas à pax rústica, santuário de virtudes cristãs, e por outro lado aos conflitos e desventuras urbanas. O campo tipifica um segmento mágico de um passado que o crescimento urbano ameaça destruir.
O voleibol feminino e seu posicionamento no campo esportivo brasileiro

Directory of Open Access Journals (Sweden)

Tatiana Moreira

2013-11-01

Full Text Available http://dx.doi.org/10.5007/2175-8042.2013v25n41p269 O presente artigo oferece reflexões introdutórias acerca do posicionamento do voleibol feminino no interior do campo esportivo brasileiro. Por meio da pesquisa exploratória com base em Pinheiro (1995, Pizzolato (2004, Marchi Jr. (2004, Costa (2005, Vlastuin (2008, Moreira (2009 e Afonso (2011, identificamos pontos centrais que orientaram a interpretação sociológica fundamentada pela Sociologia Reflexiva de Bourdieu. Constatamos que a trajetória histórica do voleibol feminino no campo esportivo brasileiro se deu entre habitus construídos e legitimados sob efeitos de dominação simbólica do voleibol masculino, instauradores das leis de reprodução social e que refletem o seu posicionamento hierárquico no campo esportivo brasileiro.
Lentes progressivas: análise dos campos intermediário e de perto por deflexometria

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Celso Marcelo Cunha

2013-02-01

Full Text Available OBJETIVO: Avaliar por deflexometria as diferentes regiões das lentes progressivas e determinar as áreas dos campos de visão intermediário e de perto. MÉTODOS: Foram incluídas vinte e duas lentes progressivas com poder +1,00 DE para longe e duas adições diferentes (adição 1,00 e 2,00, 11 de cada. Mediram-se as áreas dos campos intermediário e de perto entre as isoastigmáticas de 0,5 DC. RESULTADOS: Encontraram-se diferenças significativas entre as áreas dos campos intermediário e de perto das lentes estudadas. Entre a área do campo intermediário e a adição observou-se correlação inversa; entre a área do campo intermediário e a extensão vertical do corredor encontrou-se correlação direta. CONCLUSÃO: Com esses dados permitem-se recomendar as lentes de acordo com o campo de maior necessidade visual de cada usuário.
O campo da Lingüística Documentária

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Maria de Fátima Gonçalves Moreira Tálamo

Full Text Available Proposição do campo da Lingüística Documentária cuja função primordial é a de estabelecer parâmetros e modelos de elaboração de códigos para o processamento da informação - construção e recuperação - com o objetivo de responder à questão, nuclear da área de Ciência da Informação, relacionada à transformação de conteúdos registrados em elementos estruturados. Para isso, enfatizam-se, tanto os traços que relacionam este campo à revolução lingüística em curso desde o século 20, como as interfaces que tal campo mantém com as disciplinas que abordam a linguagem sob os aspectos sintático, semântico, conceitual e comunicacional, definindo-se seus problemas específicos bem como discutindo seus vértices conceituais.
Pesquisa de campo qualitativa: uma vivência em geografia humanista

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Rita Jaqueline Nogueira Chiapetti

2011-01-01

Full Text Available O objetivo deste artigo é descrever a experiência de uma pesquisa de campo qualitativa em Geografia, com uma abordagem humanista. A pesquisa de campo foi feita no município de Itacaré, sul do estado da Bahia, com o propósito compreender como os sujeitos de Itacaré percebem o rio das Contas, qual é o significado do rio para eles. Como método de pesquisa de campo, optamos pela história oral e pelas técnicas da entrevista, da observação e, ainda, pelo registro de paisagens através de fotografias. A nossa presença em Itacaré foi importante para o êxito da pesquisa porque pudemos conhecer melhor as pessoas e o seu cotidiano, fato que contribuiu para a qualidade das informações contidas nas 41 entrevistas feitas. Também, essa convivência com as pessoas do lugar foi uma grande experiência vivida na perspectiva da Geografia Humanista.
María Zambrano e Cristina Campo: amicizia e destino

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Adele Ricciotti

2014-01-01

Full Text Available Il presente saggio intende analizzare l'amicizia e la relazione intellettuale instauratasi tra María Zambrano e Cristina Campo durante la seconda metà degli anni Cinquanta a Roma, testimoniata dalle lettere scritte da Cristina Campo all'amica e pubblicate in Italia. La vicinanza del pensiero e del sentimento religioso che le caratterizza è senz'altro un motivo d'indagine. Questa importante corrispondenza è inoltre studiata in relazione alla filosofia di Simone Weil, figura mediatrice che unisce le due autrici.
A 77 K MOS magnetic field detector

Energy Technology Data Exchange (ETDEWEB)

Murphy, R S; Torres, A. [Instituto Nacional de Astrofisica Optica y Electronica, Puebla (Mexico); Garcia, P.J. [Universidad Veracruzana, Veracruz (Mexico); Gutierrez, E.A. [Motorola, Puebla (Mexico)

2001-12-01

An integrated MOS (metal-oxide-semiconductor)-compatible magnetic field detector (split-drain MAGFET) for operation at liquid-nitrogen temperature LNT (77 K) is presented. The measured relative magnetic sensibility (S{sub a}) is approximately 14%/T (double the value ever reported) using a non-optimized MAGFET structure (W/L) = (100 mm/125 mm). The cryo-magnetic structure was tested without a built-in preamplifier. It presents a power consumption of the order of mW. [Spanish] A traves de este articulo se presenta un detector de campo magnetico (split-drain MAGFET), basado en el transistor de efecto de campo MOS (metal-oxido-semiconductor), y totalmente compatible con procesos de fabricacion de circuitos integrados CMOS. La operacion optima de este detector es a temperaturas criogenicas. Aqui se presentan los resultados experimentales de la caracterizacion de una estructura no optimizada con dimensiones (W / L) = (100 mm/125 mm) a la temperatura del nitrogeno liquido (77 K). La sensibilidad relativa medida es de cerca del 14 % T, casi el doble del valor maximo antes reportado en la literatura. El dispositivo se midio sin un pre-amplificador integrado, mostrando un consumo de potencia del orden de microwatts.
O mato & o asfalto: Campos da Antropologia no Brasil

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Mariza Corrêa

2011-06-01

Full Text Available O artigo é um breve apanhado sobre o campo da antropologia no Brasil. Feito originalmente para leitores estrangeiros, pareceu-me melhor deixá-lo como estava a atualizá-lo, na expectativa de que possa ser útil para jovens iniciantes nesse campo, já que o texto refere algumas instituições importantes para a sua formação nos últimos anos — como os programas de pós-graduação e a Associação Brasileira de Antropologia (ABA, e seus temas de pesquisa. Propõe-se aqui também que não apenas a interdisciplinaridade, bastante praticada hoje, mas também relações transversais ao próprio campo da antropologia são desejáveis — isto é, que os antropólogos “urbanos” levem em conta o que dizem os etnólogos, que estes dialoguem com os estudos de gênero etc. De todo modo, a bibliografia incluída ainda é, e continuará a sê-lo por um bom tempo, leitura necessária para pesquisadores que se interessem pela história da antropologia.
Circumscribing campo rupestre - megadiverse Brazilian rocky montane savanas.

Science.gov (United States)

Alves, R J V; Silva, N G; Oliveira, J A; Medeiros, D

2014-05-01

Currently campo rupestre (CR) is a name accepted and used internationally by botanists, zoologists, and other naturalists, usually applied to a very specific ecosystem, despite the lack of a consensual published circumscription. We present a tentative geographic circumscription of the term, combining data on climate, geology, geomorphology, soil, flora, fauna and vegetation. The circumscription of campo rupestre proposed herein is based on the following premises: (1) the classification of vegetation is not an exact science, and it is difficult to attain a high degree of consensus to the circumscription of vegetation names; (2) despite this, vegetation classification is useful for conservation and management. It is thus desirable to circumscribe vegetation types with the greatest attainable precision; (3) there is a need to preserve all montane and rocky vegetation types, regardless of classification, biome, etc; (4) the CRs are formed by a complex mosaic of vegetation types including rock-dwelling, psammophilous, aquatic, epiphytic, and penumbral plant communities. Campos rupestres stricto sensu are a Neotropical, azonal vegetation complex endemic to Brazil, forming a mosaic of rocky mountaintop "archipelagos" inserted within a matrix of zonal vegetation, mainly in the Cerrado and Caatinga provinces of the Brazilian Shield (southeastern, northeastern and central-western regions), occurring mainly above 900 m asl. up to altitudes exceeding 2000 m, having measured annual precipitation between 800 and 1500 mm, and an arid season of two to five months.
Development of ceramic with clays from Campos dos Goytacazes and Itaborai

International Nuclear Information System (INIS)

Ribeiro, A.P.; Babisk, M.P.; Monteiro, S.N.; Vieira, C.M.F.

2012-01-01

The county of Campos dos Goytacazes, located in the north region of the State of Rio de Janeiro, currently is the leading red ceramic pole of the State. However, the clays are kaolinitic predominance with low amount of flux oxides as well as elevated loss on ignition. In this work compositions were investigated using of a clay from the county of Itaborai, that is approximately 200 km away from Campos, to correct the deficiencies of the clay from Campos and so to improve the the technological properties of the ceramic. Rectangular specimens were prepared by uniaxial mold-press at 18 MPa and then fired at 800 deg C. The evaluated physical and mechanical properties were: plasticity, linear shrinkage, water absorption and flexural rupture strength. The results indicated that the clay from Itaborai significantly improves the evaluated properties of the ceramic. (author)
EINSTEIN EQUATIONS FOR TETRAD FIELDS ECUACIONES DE EINSTEIN PARA CAMPOS TETRADOS

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Héctor Torres-Silva

2008-11-01

Full Text Available Every metric tensor can be expressed by the inner product of tetrad fields. We prove that Einstein's equations for these fields have the same form as the stress-energy tensor of electromagnetism if the total external current . Using the Evans' unified field theory, we show that the true unification of gravity and electromagnetism is with source-free Maxwell equations.Todo tensor métrico puede ser expresado por el producto interno de campos tetrados. Se prueba que las ecuaciones de Einstein para esos campos tienen la misma forma que el tensor electromagnético de momento-energía si la corriente externa total es igual a cero. Usando la teoría de campo unificado de Evans se muestra que la verdadera unificación de la gravedad y el electromagnetismo es con las ecuaciones de Maxwell sin fuentes.
A METRIC FOR A CHIRAL POTENTIAL FIELD UNA MÉTRICA PARA UN CAMPO POTENCIAL QUIRAL

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Héctor Torres-Silva

2008-11-01

Full Text Available In this paper we present an example of a specific metric which geometrizes explicitly a light-like four-vector potential (chiral field. The geometrization shows that such a vector has the same geometrical structure as a gravitational Kerr field. We discuss a theoretical proposition that a rotating body generates, besides a special gravitational field, a magnetic-type gauge field which might be identified with a chiral geometrized field. This chiral field represents a novel type of field because we cannot identify it with any of the known electromagnetic fields. As an application of this theory we discuss the morphology of the planets around the sun.En este trabajo se presenta un ejemplo de una métrica especifica que geometriza explícitamente un potencial cuadrivector tipo luz (campo quiral. La geometrización muestra que tal vector tiene la misma estructura geométrica que un campo gravitacional Kerr. Se discute una proposición teórica que un cuerpo rotante genera, su gravitación y el calibre de campo tipo magnético que puede ser identificado con un campo quiral geometrizado. Este campo quiral representa un tipo novedoso de campo que no puede ser identificado con alguno de los campos electromagnéticos conocidos. Como aplicación de esta teoría se discute la morfología de los planetas alrededor del sol.
O surgimento do campo da atividade física para idosos no Brasil

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Silvio de Cassio Costa Telles

2015-06-01

Full Text Available É comum hoje em dia a inserção do idoso brasileiro no rol da prática de atividades físicas. No entanto, até o segundo quartel do século XX, acreditava-se que a prática de atividade física sistemática poderia ser nociva ou mesmo antecipar a morte. Este estudo busca analisar e descrever como surgiu o campo da atividade física para idosos no Brasil. Metodologicamente utilizamos uma pesquisa bibliográfica aliada à Teoria do Campo do sociólogo Pierre Bourdieu (1983, que possibilitou a analogia entre o campo internacional do idoso, que se mostrou precursor, e o campo nacional. Tal relação desenvolveu um novo habitus, que transformou o medo em confiança, a dúvida em certeza, o sedentarismo em dinamismo, a eminência da morte em ampliação da vida, culminando no arquétipo dos “novos velhos” brasileiros.
Radiometric age of granite from Campo Formoso, BA-Brazil - a minimum age for Jacobina group

International Nuclear Information System (INIS)

Torquato, J.R.; Oliveira, M.A.F.T. de; Bartels, R.L.

1978-01-01

The Campo Formoso granite represents the magmatic phase of the remobilized Pre-Jacobina basement, located within an are defined by the Serra de Jacobina, north of Campo Formoso, Bahia. Intrusive relationships between this granite and the Jacobina Group metasediments, gradational changes in textures and compositions between the granite and basement rocks, and the general structural-topographic expression of this suggest a mantled gneiss dome model for this area. A RB/Sr whole rock isochron age of 1911 +- 13 m.y. for the Campo Formoso granite is established. This date is interpreted as the age of the development of the structure, as well as a minimum age for the Jacobina Group metasediments. K/Ar dates on muscovites from the Campo Formoso granite are concordant with the Rb/Sr isocron. It is suggested that a lower regional thermal gradient in the Campo Formoso area during Transamazonic time is the cause for a more rapid cooling environment. (Author) [pt

Poynting's theorem for complex fields; El teorema de Poynting para campos complejos

Energy Technology Data Exchange (ETDEWEB)

Fernandez Guasti, M. [Universidad Autonoma Metropolitana-Unidad Iztapalapa, Mexico, D.F (Mexico)

2001-04-01

Poynting's theorem is derived for complex electromagnetic fields without invoking the harmonic dependence of the fields. This reformulation yields the functional form of a continuity equation. The definition of poynting's vector for complex fields reduces to its traditional definition for real fields without involving an extra factor of 1/2. [Spanish] Se presenta la derivacion del teorema de Poynting utilizando una representacion compleja de los campos electromagneticos. En esta reformulacion se obtiene cabalmente la forma funcional de una ecuacion de continuidad. Este resultado no requiere que los campos armonicos sean trenes de onda infinitos, de manera que con este formalismo es posible abordar el caso de pulsos electromagneticos. La definicion del vector Poynting para campos complejos se reduce a la definicion convencional si los campos son reales sin involucrar un factor de 1/2 adicional.
Battery recycling machine; Maquina recicladora de pilas

Energy Technology Data Exchange (ETDEWEB)

Higuera Gonzalez, R.M; Esquivel Montes, C.E; Perez Razo, E; Sanchez Guerrero, O.A. [Tecnologico de Estudios Superiores de Ixtapaluca, Ixtapaluca, Estado de Mexico (Mexico)

2013-03-15

Batteries pollute the environment and therefore require special treatment or confine recycling in appropriate places, Mexico only has places for confining the batteries and send them to other countries for recycling. The purpose of this project is to reduce the contamination of soil and create a culture for the recycling of batteries. The prototype performs the separation of metals and chemical residues, so that later they can be processed separately. The machine is divided into two parts, mechanics and electronics, the mechanical part was designed to disarm it for easy maintenance, another advantage in the field of electronics and security is to control the machine from a computer at a distance significantly reducing accidents. To automate the machine will use a PLC clock for easy programming. [Spanish] Las pilas contaminan el medio ambiente y por ello requieren un tratamiento especial de reciclaje o confinarlos en lugares adecuados, Mexico solo cuenta con lugares para confinar las pilas y mandarlas a otros paises para su reciclaje. El proposito de este proyecto es reducir la contaminacion del suelo y crear una cultura para el reciclaje de pilas. El prototipo realiza la separacion de metales y residuos quimicos, para que mas adelante se puedan procesar por separado. La maquina se divide en dos partes; la mecanica y la electronica, la parte mecanica fue disenada para desarmarse esto para su facil mantenimiento, otra de las ventajas en el campo de electronica y seguridad es poder controlar el prototipo desde una computadora, a una distancia considerable reduciendo asi los accidentes. Para automatizar la maquina se utilizo un reloj PLC por su facil programacion.
Nuevos campos de precipitación media anual para Colombia

OpenAIRE

Álvarez Villa, Oscar David; Vélez Upegui, Jaime Ignacio; Poveda Jaramillo, Germán

2008-01-01

Se obtiene un campo de intensidad de precipitación promedio para el territorio colombiano mediante el análisis de los datos proporcionados de forma gratuita por la mision TRMM, el cual se ha empleado como información secundaria para la estimación de nuevos campos de precipitación para Colombia. Se comprobo que dicha información secundaria manifiesta muchas de las características físicas del fenómeno de precipitación. Además se mostro que presenta una fuerte correlación con los promedios d...
Analytic computation of the quantum levels of a two-dimensional hydrogenic donor in the presence of a constant magnetic field of arbitrary strength

Energy Technology Data Exchange (ETDEWEB)

Villalba, Victor M.; Pino, Ramiro [Instituto Venezolano de Investigaciones Cientificas, Caracas (Venezuela)

2001-03-01

In this article we review different techniques for computing the energy spectrum of 2 D hydrogenic donors and two-electron quantum dots in the presence of a constant, magnetic field perpendicular to the plane of the electron. We compute the 1S, 2P- and 3D- energy levels via a scaled variational mixed-bases method. We compare our results with those obtained with the shifted 1/N method. [Spanish] En el presente articulo se exhiben distintos metodos para calcular el espectro de energia de donores hidrogenicos y puntos cuanticos con dos electrones en presencia de un campo magnetico constante perpendicular al plano del electron. Se calculan los niveles de energia 1S, 2P- y 3D- con ayuda del metodo variacional de bases mixtas con escalamiento. Comparamos nuestro resultados con los obtenidos con ayuda del metodo 1/N con corrimiento.
VIII Graduação em Campo: espaço a jovens pesquisadores e incentivo à pesquisa de campo na área de Antropologia Urbana

OpenAIRE

2014-01-01

Em setembro, ocorreu a oitava edição do Seminário Graduação em Campo, evento realizado pelo NAU – Núcleo de Antropologia Urbana da USP. O evento foi criado para que os alunos de graduação dos cursos de Ciências Sociais e Antropologia no Brasil pudessem apresentar seus trabalhos de pesquisa, valorizando assim a pesquisa de campo nas diversas instituições de ensino do país. Durante o congresso, os alunos puderam assistir a filmes etnográficos e também participar de minicursos ministrados pelos...
Contribuição no estudo do transmissor MOS split drain como sensor de campo magnetico

OpenAIRE

Hugo Ricardo Jimenez Grados

1999-01-01

Resumo: : Este trabalho visa a familiarização com o dispositivo MOS- Split Drain através da construção de diferentes configurações geométricas, seguindo as regras da tecnologia CMOS - 0,8 Jl1Tlda AMS (Austria Mikrosysteme International), e de suas respectivas caracterizações elétricas e magnéticas. Medidas realizadas com os diversos protótipos fabricados permitiram a constatação de diversas características divulgadas na literatura e de suas limitações. O aprendizado que resulta deste trabalho...
Las organizaciones intermedias en el campo de la responsabilidad social empresarial

OpenAIRE

Abelenda Casalet, Lucía

2010-01-01

Se presenta un estudio sobre un tipo particular de organizaciones de la sociedad civil, las organizaciones intermedias. Focalizamos el estudio en las organizaciones intermedias que se desempeñan en el campo de la Responsabilidad Social Empresarial. La investigación está orientada a la búsqueda de rasgos que puedan definir la acción de estas organizaciones y su capacidad de innovación social en un campo particular. En el desarrollo de la investigación se jerarquizó el nivel micro, relacionado ...
Orientação pelo campo geomagnético

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Pedro Henrique Arruda Aragão

1985-11-01

Full Text Available In the past few years scientists have shown that some kinds of organisms utilize the geomagnetic field as a mechanism of orientation. Last September, in analyzing samples of water and sediments collected from Igapo Lake, in Londrina neighborhood, we realized that it also contained this kind of microorganisms, which also utilizes magnetic field lines for its orientation.Estudos realizados nestes últimos anos têm mostrado que algumas espécies de organismos fazem uso do campo geomagnético como mecanismo de orientação. Em setembro último, analisando amostras de água e sedimentos da periferia do Lago Igapó – Londrina, pudemos observar a existência de microorganismos que utilizam as linhas de campo para orientação.
Imagen de retina de campo ultra-amplio

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Gerardo García-Aguirre

2017-11-01

Conclusión: Las imágenes de campo ultra-amplio han revolucionado la forma en la que estudiamos y entendemos la enfermedad de la retina. A medida que la tecnología para obtenerlas se haga más accesible, formará parte del armamentario de rutina para estudiar las enfermedades de la retina.
Helping enhances productivity in campo flicker ( Colaptes campestris) cooperative groups

Science.gov (United States)

Dias, Raphael Igor; Webster, Michael S.; Macedo, Regina H.

2015-06-01

Reproductive adults in many bird species are assisted by non-breeding auxiliary helpers at the nest, yet the impact of auxiliaries on reproduction is variable and not always obvious. In this study, we tested Hamilton's rule and evaluated the effect of auxiliaries on productivity in the facultative cooperative breeder campo flicker ( Colaptes campestris campestris). Campo flickers have a variable mating system, with some groups having auxiliaries and others lacking them (i.e., unassisted pairs). Most auxiliaries are closely related to the breeding pair (primary auxiliaries), but some auxiliaries (secondary auxiliaries) are unrelated females that joined established groups. We found no effect of breeder quality (body condition) or territory quality (food availability) on group productivity, but the presence of auxiliaries increased the number of fledglings produced relative to unassisted pairs. Nonetheless, the indirect benefit of helping was small and did not outweigh the costs of delayed breeding and so seemed insufficient to explain the evolution of cooperative breeding in campo flickers. We concluded that some ecological constraints must limit dispersal or independent breeding, making staying in the group a "best-of-a-bad-job" situation for auxiliaries.
Regeneration after fire in campo rupestre : Short- and long-term vegetation dynamics

OpenAIRE

Le Stradic , Soizig; Hernandez , Pauline; Fernandes , Geraldo Wilson; Buisson , Elise

2018-01-01

International audience; The Cerrado (Brazilian savanna) is the second largest biome in Brazil, covering 22% of the country, and campo rupestre is one of the most biodiverse ecosystem. Campo rupestre are extremely old mountaintop tropical ecosystems, composed of a mosaic of herbaceous, shrubland and savanna vegetation, generally located above 900 m above sea level characterized by shallow, acidic and nutrient-poor soils. In the context of increased land-use changes, effective conservation and ...
Il campo dell'arte: regole e valori dell'istituzione letteraria

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Paola Avella

2011-07-01

Full Text Available Si considera in questo articolo il campo artistico, descritto da Pierre Bourdieu, come il teatro di una lotta per la conquista del monopolio della legittimità letteraria tra (disposizioni sociali, a cui corrispondono precise strategie simboliche, concorrenti. Viene, così, messo in discussione il mito della gratuità e del disinteresse del lavoro intellettuale insieme a quello dell’esperienza estetica come identificazione immediata e contemplazione dell’opera. Le istanze di legittimazione interne al campo, infatti, determinano i modi della produzione, ma anche quelli dell’appropriazione. Solo un fruitore dotato della competenza adeguata sarà in grado di riconoscere il valore esemplificazionale inscritto nel testo.
Photoreceptors in electric field : Fotoreceptores em campo elétrico

OpenAIRE

Juliana Guerra Hühne

2015-01-01

Resumo: Estudos anteriores e evidências experimentais sugerem um papel importante dos campos elétricos endógenos no direcionamento da migração celular, no desenvolvimento e na regeneração celular e na cicatrização de feridas. Em culturas de células, campos elétricos de corrente contínua influenciam a divisão celular, a polaridade, a forma e a motilidade das células. As distrofias das células fotoreceptoras são uma das principais causas de cegueira hereditária no mundo ocidental; a aplicação d...
As possibilidades analíticas da noção de campo social

Directory of Open Access Journals (Sweden)

Afrânio Mendes Catani

2011-03-01

Full Text Available O texto procura, num primeiro momento, discutir a noção de campo social, desenvolvida pelo sociólogo francês Pierre Bourdieu (1930-2002 para, em seguida, pensar o campo universitário em suas especificidades, esboçando possibilidades analíticas para o caso brasileiro a partir de seu clássico livro La noblesse d´État. Grandes Écoles et esprit de corps (1989. Embora desenvolvido por Bourdieu com a finalidade de estudar mecanismos de dominação vigentes na sociedade francesa, pretende-se indicar como esse aparato epistêmico prático pode, através do estabelecimento de relações de homologia, ser trabalhado para o estudo do campo universitário brasileiro.
Simplified approaches for the numerical simulation of welding processes with filler material

Energy Technology Data Exchange (ETDEWEB)

Carmignani, B.; Toselli, G. [ENEA, Divisione Fisica Applicata, Centro Ricerche Ezio Clementel, Bologna (Italy)

2001-07-01

Due to the very high computation times, required by the methodologies pointed out during the studies carried out at ENEA-Bologna concerning the numerical simulations of welds with filler material of steel pieces of high thickness (studies presented also at the 12. and 13. International ABAQUS Users' Conferences), new simplified methodologies have been proposed and applied to an experimental model of significant dimensions. (These studies are of interest in the nuclear field for the construction of the toroidal field coil case, TFCC, for the international thermonuclear experimental reactor, ITER machine). In this paper these new methodologies are presented together the obtained results, which have been compared, successfully, with the ones obtained by the use of the previous numerical methodologies considered and also with the corresponding experimental measures. These new calculation techniques are in course of application for the simulation of welds of pieces constituting a real component of ITER TF coil case. [Italian] A causa dei tempi di calcolo molto elevati richiesti dalle metodologie individuate e messe a punto durante gli studi eseguiti in ENEA-Bologna riguardanti le simulazioni numeriche di saldature, con apporto di materiale, di pezzi di acciaio di grande spessore (studi presentati anche alle precedenti Conferenze Utenti ABAQUS, 12{sup 0} e 13{sup 0} ABAQUS Users' Conferences), sono state cercate e proposte nuove metodologie semplificate, che sono state poi applicate ad un modello sperimentale di dimensioni significative. (Si ricorda che questi studi sono di interesse nel campo nucleare per la costruzione delle casse per contenere le bobine che daranno luogo al campo magnetico della macchina ITER, reattore internazione sperimentale termonucleare). Nel lavoro qui presentato sono descritte queste nuove metodologie e sono riportati i risultati ottenuti dalla loro applicazione unitamente ai confronti (abbastanza soddisfacenti) con i risultati
Literatura y derechos humanos: “un campo naciente”

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M. Jimena Saenz

2014-06-01

Full Text Available En este trabajo se propone una exploración de uno de los más recientes movimientos conjuntivos del “derecho y”: el área o “campo naciente” que articula las relaciones entre la literatura y los derechos humanos o, en su formulación genérica, el “derecho y las humanidades”. Ello en una escala modesta que enmarca la emergencia de ese campo de estudios en un contexto general y uno de sus más claros antecedentes académicos, para en la sección central presentar con algún detalle dos de los proyectos más representativos --y discutidos-- que se han emprendido en los últimos años y que suelen considerarse fundacionales del área. Sobre el final, se plantean algunos de los problemas y perspectivas del diálogo entre los estudios literarios y los derechos humanos.
EDUCAÇÃO DO CAMPO: ANÁLISE DAS REIVINDICAÇÕES DOS TRABALHADORES DO CAMPO E DAS PROPOSTAS DOS GOVERNOS DE LUIZ INÁCIO LULA DA SILVA E DILMA ROUSSEFF.

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Rubneuza Leandro de Souza

2013-12-01

Full Text Available Refletiremos neste artigo acerca de como a política pública de Educação do Campo, fruto de muitas lutas e construção coletiva, vem sofrendo retrocessos justamente por parte de governos do Partido dos Trabalhadores. Diante dessa questão, fez-se uma análise dos governos petista de Luiz Inácio Lula da Silva (2003 – 2010 e Dilma Rousseff (2011-. Na análise dessa trajetória de dezesseis anos percebemos que a luta pela Educação do Campo sofreu retrocessos de duas naturezas: a deslocamento de lugar da Educação do Campo que paulatinamente vem se deslocando das organizações de luta pela terra para comitês, fóruns e universidades e b pela institucionalização da política, que afastou deliberadamente as organizações dos trabalhadores de sua condução. No correspondente à construção da política pública da Educação do Campo percebe-se que mesmo um Estado nas mãos de um partido considerado dos trabalhadores não tem sido suficiente para implementação de políticas coerentes com as reivindicações dos movimentos sociais do campo. Os resultados indicam três momentos que corresponderam à década dos governos Petistas, os quais caracterizamos como: Esperança acesa (20 03 a 2007; aceno para esquerda e virada à direita (2008 a 2010 e ceder para incorporar (2010 aos dias atuais.
A psicologia e a constituição do campo educacional brasileiro La psicología y la constitución del campo de educación brasileño The psychology and the constitution of the brazilian education field

OpenAIRE

Ana Paola Sganderla; Diana Carvalho de Carvalho

2010-01-01

O presente artigo tem por objetivo discutir como a Psicologia contribuiu para a formação do campo educacional brasileiro início do século XX. Ao mesmo tempo, o campo educacional forneceu elementos fundamentais que serviram de base à constituição dessa ciência como campo científico reconhecido no País. Como base teórica para a investigação, utilizamos o conceito de campo social de Pierre Bourdieu, relacionando as implicações práticas presentes nesta constituição: Intelectualidade influente; es...
Analysis of machining and machine tools

CERN Document Server

Liang, Steven Y

2016-01-01

This book delivers the fundamental science and mechanics of machining and machine tools by presenting systematic and quantitative knowledge in the form of process mechanics and physics. It gives readers a solid command of machining science and engineering, and familiarizes them with the geometry and functionality requirements of creating parts and components in today’s markets. The authors address traditional machining topics, such as: single and multiple point cutting processes grinding components accuracy and metrology shear stress in cutting cutting temperature and analysis chatter They also address non-traditional machining, such as: electrical discharge machining electrochemical machining laser and electron beam machining A chapter on biomedical machining is also included. This book is appropriate for advanced undergraduate and graduate mechani cal engineering students, manufacturing engineers, and researchers. Each chapter contains examples, exercises and their solutions, and homework problems that re...
Creencias tradicionales y campos electromagnéticos

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Colin A. Ross

2011-09-01

Full Text Available El autor propone que existe una serie de creencias y prácticas tradicionales que pueden proporcionar pistas acerca de la interacción de campos electromagnéticos en la biosfera. Por ejemplo, la creencia en el mal de ojo puede ser una construcción cultural relacionada con la sensación de estar siendo observado, pero a su vez puede estar basada en las emisiones de ondas electromagnéticas a través de los ojos. En este artículo se presentan datos para apoyar esta hipótesis. Otras creencias tradicionales, como la importancia de la conexión con la Madre Tierra también pueden contener una explicación similar. En este artículo se presentan una serie de hipótesis científicamente verificables sobre creencias tradicionales y campos electromagnéticos. En esta fase, los datos son insuficientes para confirmar la hipótesis, no obstante el objetivo de este artículo es estimular el pensamiento crítico y la investigación sobre algunas creencias tradicionales.

El creciente campo de los Estudios Sensoriales

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David Howes

2014-09-01

Full Text Available Este ensayo presenta una breve descripción acerca del giro sensorial en la investigación contemporánea, y propone algunas perspectivas de trabajo para futuras investigaciones. Esta labor no pretende ser exhaustiva y, más bien, busca indicar las principales tendencias en este campo. El ensayo, en su primera parte, ofrece una mirada general sobre la aparición y el desarrollo de la historia y la antropología de los sentidos. En la segunda parte, la atención se concentra en cómo el campo de los estudios sensoriales puede ser, de otro lado, conceptualizado como compuesto de cultura visual, cultura auditiva (o estudios del sonido, cultura del olfato, cultura del gusto y cultura del tacto. Se ofrece una explicación acerca de la génesis de estas divisiones. Posteriormente, se presenta una visión general de algunas cuestiones claves en los estudios sensoriales, como la pregunta por el número de los sentidos y la relación entre orden sensorial y orden social. El ensayo concluye con ocho proposiciones para los estudios sensoriales.
El creciente campo de los Estudios Sensoriales

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David Howes

2014-08-01

Full Text Available Este ensayo presenta una breve descripción acerca del giro sensorial en la investigación contemporánea, y propone algunas perspectivas de trabajo para futurasinvestigaciones. Esta labor no pretende ser exhaustiva y, más bien, busca indicar las principales tendencias en este campo. El ensayo, en su primera parte, ofrece una mirada general sobre la aparición y el desarrollo de la historia y la antropología de los sentidos. En la segunda parte, la atención se concentra en cómo el campo de los estudios sensoriales puede ser, de otro lado, conceptualizado como compuesto de cultura visual, cultura auditiva (o estudios del sonido, cultura del olfato, cultura del gusto y cultura del tacto. Se ofrece una explicación acerca de la génesis de estas divisiones. Posteriormente,se presenta una visión general de algunas cuestiones claves en los estudios sensoriales, como la pregunta por el número de los sentidos y la relación entre orden sensorial y orden social. El ensayo concluye con ocho proposiciones para los estudios sensoriales.
Sistemas Correctores de Campo Para EL Telescopio Cassegrain IAC80

Science.gov (United States)

Galan, M. J.; Cobos, F. J.

1987-05-01

El proyecto de instrumentación de mayor importancia que ha tenido el Instituto de Astrofisica de Canarias en los últimos afios ha sido el diseflo y construcción del te1escopio IAC8O. Este requería del esfuerzo con junto en mec´nica, óptica y electrónica, lo que facilitó la estructuración y el crecimiento de los respectivos grupos de trabajo, que posteriormente se integraron en departamentos En su origen (1977), el telescopio IAC80 fue concebido como un sistema clásico tipo Cassegrain, con una razón focal F/i 1.3 para el sistema Casse grain y una razón focal F/20 para el sistema Coudé. Posteriormente, aunque se mantuvo la filosofia de que el sistema básico fuera el F/11.3, se consideró conveniente el diseño de secundarios para razones focales F/16 y F/32, y se eliminó el de F/20. Sin embargo, dada la importancia relativa que un foco estrictamente fotográfico tiene en un telescopio moderno, diseñado básicamente para fotometría fotoeléctrica y con un campo util mínimamente de 40 minutos de arco, se decídió Ilevar a cabo el diseño de un secundario F/8 con un sistema corrector de campo, pero que estuviera formado únicamente por lentes con superficies esféricas para que asl su construcción fuera posible en España ó en México. La creciente utilización de detectores bidimensionales para fines de investigación astron6mica y la viabilidad de que en un futuro cercano éstos tengan un área sensible cada vez mayor, hicieron atractiva la idea de tener diseñado un sistema corrector de campo para el foco primario (F/3), con un campo útil mínimo de un grado, y también con la limitante de que sus componentes tuvieron sólamente supérficies esféricas. Ambos diseños de los sis-temas correctores de campo se llevaron a cabo, en gran medida, como parte de un proyecto de colaboración e intercambio en el área de diseño y evaluación de sistemas ópticos.
Circumscribing campo rupestre – megadiverse Brazilian rocky montane savanas

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RJV. Alves

Full Text Available Currently campo rupestre (CR is a name accepted and used internationally by botanists, zoologists, and other naturalists, usually applied to a very specific ecosystem, despite the lack of a consensual published circumscription. We present a tentative geographic circumscription of the term, combining data on climate, geology, geomorphology, soil, flora, fauna and vegetation. The circumscription of campo rupestre proposed herein is based on the following premises: (1 the classification of vegetation is not an exact science, and it is difficult to attain a high degree of consensus to the circumscription of vegetation names; (2 despite this, vegetation classification is useful for conservation and management. It is thus desirable to circumscribe vegetation types with the greatest attainable precision; (3 there is a need to preserve all montane and rocky vegetation types, regardless of classification, biome, etc; (4 the CRs are formed by a complex mosaic of vegetation types including rock-dwelling, psammophilous, aquatic, epiphytic, and penumbral plant communities. Campos rupestres stricto sensu are a Neotropical, azonal vegetation complex endemic to Brazil, forming a mosaic of rocky mountaintop “archipelagos” inserted within a matrix of zonal vegetation, mainly in the Cerrado and Caatinga provinces of the Brazilian Shield (southeastern, northeastern and central-western regions, occurring mainly above 900 m asl. up to altitudes exceeding 2000 m, having measured annual precipitation between 800 and 1500 mm, and an arid season of two to five months.
La noción de campo en Kurt Lewin y Pierre Bourdieu: un análisis comparativo

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José Manuel Fernández Fernández

2009-01-01

Full Text Available La noción de campo desempeñó un papel central en los proyectos científicos de Kurt Lewin y Pierre Bourdieu. En este artículo hacemos un análisis comparativo del uso teórico y metodológico que hicieron de este concepto en la producción de su fecunda obra en los campos de la psicología y de la sociología, respectivamente. Para ello nos hemos centrado en cinco cuestiones cruciales que de modo explícito plantearon estos dos investigadores en la elaboración de su teoría de campo: la ruptura con las objetivaciones parciales, la construcción del objeto, la dinámica interna de los campos, la delimitación de sus fronteras y la representación matemática de los hechos psicológicos y sociológicos. Concluimos con una síntesis en la que ponemos de relieve algunas importantes coincidencias y diferencias en la teoría de campo de Kurt Lewin y Pierre Bourdieu. Ambos le asignaron funciones epistemológicas similares, pero podemos apreciar en Lewin un mayor mimetismo respecto a la noción de campo proveniente de la física y sus posibilidades de formulación matemática, mientras que en Bourdieu la noción de campo es inseparable de las de habitus y capital, lo que facilita un análisis más integrado de los fenómenos micro y macrosociales, una apreciación más sofisticada de sus dimensiones temporales y criterios más precisos para establecer los límites de un campo.
El ordenamiento de Medina del Campo de 1328 = The Medina del Campo Legal Code of 1328

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Ana Arranz Guzmán

2015-06-01

Full Text Available Durante los dos últimos siglos la controversia historiográfica ha envuelto en una cierta nebulosa la reunión mantenida por Alfonso XI en Medina del Campo en el año 1328, siendo calificada por algunos historiadores de auténticas Cortes o negando, otros, su propia existencia. Con la transcripción en estas páginas del Ordenamiento elaborado en ella, así como con el análisis realizado del texto y su cotejo con las actas editadas de las Cortes madrileñas de 1329, se espera cerrar, quizá definitivamente, la larga polémica suscitada por esta asamblea, a la vez que aportar algunos datos más sobre la sobresaliente labor legislativa llevada a cabo por el monarca castellano.Scholarship over the last two centuries has debated once and again without reaching a consensus over the meeting held by Alfonso XI in Medina del Campo in 1328, considered by some historians as an authentic parliament (Cortes while others deny it. With the transcription of this legal code (Ordenamiento and its comparison with the edited account of the proceedings of the Cortes held in Madrid in 1329, our purpose is to lay to rest the debate provoked by this assembly. Furthermore, we intend to present additional information relating to the salient legislative work undertaken by this Castilian monarch.
Desempeño de sensores de campo electrostático en sistemas de alerta de tormentas

OpenAIRE

Aranguren Fino, Harby Daniel

2011-01-01

Esta tesis presenta un estudio operacional y científico de sensores de campo electrostático mediante el análisis de tormentas eléctricas en tres lugares: Colombia (2010), usando una estación de medida en Bogotá; Florida - EE.UU (2009), usando 31 sensores en el Kennedy Space Center - KSC y Navarra - España (2010), con 11 molinos de campo en parques eólicos. En total se analizaron cerca de 67000 medidas de variaciones de campo eléctrico producidas por rayos. En cada sitio se uso adicionalmente ...
MITIGACIÓN DE CAMPO MAGNÉTICO DE LÍNEAS DE TRANSMISIÓN UTILIZANDO BUCLES PASIVOS

OpenAIRE

Cadavid, Diego Raúl; Ramírez, David Alejandro; Lopera, Freddy; Correa, Andrés Felipe

2010-01-01

En este artículo se presenta un método simple para determinar el campo magnético generado por líneas de transmisión. El cálculo del campo magnético tiene en cuenta los efectos de mitigación de bucles pasivos, incluyendo su ubicación óptima en la línea mediante la aplicación de algoritmos genéticos. Los resultados de los cálculos son validados mediante reportes de casos publicados en el IEEE, software de análisis de campo electromagnético y datos experimentales arrojados de una implementación ...
Aplicación móvil para medir campos magnéticos

OpenAIRE

Valdecantos Perales, Víctor; González, Manuel Á.

2015-01-01

Este proyecto tiene como objetivo medir el campo magnético en cualquier punto de la tierra mediante un dispositivo móvil con sistema operativo Android. Con estas medidas se quieren crear puntos sobre un mapa mundial que reflejen la intensidad y sentido del campo. Estos dispositivos cuentan con un gran número de sensores tales como sensor de proximidad, acelerómetro, temperatura, gravedad, luz... pero este proyecto se van a utilizar sólo dos de esos sensores: el acelerómetro y sensor magnético...
Práticas pedagógicas na alfabetização de uma turma multisseriada no campo

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Rosilda Ribeiro Chagas

2016-12-01

Full Text Available Este artigo tem por objetivo refletir a respeito das práticas pedagógicas de alfabetizaçãode uma turma multisseriada no campo, onde as crianças da respectiva turma são considerados sujeitos históricos e de direitos. A metodologia de pesquisa qualitativa teve como procedimentos a escuta das falas, hipóteses, estratégias de aprendizagens das crianças, as quais possibilitaram a reflexão a respeito da trajetória profissional e acadêmica da professora-pesquisadora. Os estudos de Paulo Freire, Magda Soares, Mônica Molina, dentre outros, nos possibilitaram destacar que as crianças do campo necessitam que se articulem os saberes da vida coletiva do campo no processo de alfabetização. A formação docente na especificidade da educação do campo precisa ser considerada nas políticas públicas. Palavras-chave: educação do campo; alfabetização; turma multisseriada.
O campo dos economistas franceses no fim dos anos 90: lutas de fronteira, autonomia e estrutura

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Frédéric Lebaron

2001-04-01

Full Text Available A noção de economista, longe de simples e evidente, é objeto de numerosas lutas de definição. O exemplo do campo dos economistas franceses, analisado a partir de um conjunto de entrevistas, observações de dados prosopográficos, revela certas características dessas lutas. Estas opõem detendores de formas diferenciadas de capital, que estão elas mesmas em correspondência com posições distintas no campo do poder. Nessas lutas, estão em questão ao mesmo tempo a autonomia e a estrutura desse campo científico. A fraca autonomia relativa do campo da ciência econômica se faz acompanhar de uma forte homologia entre a estrutura desse campo e aquela do campo do poder francês em seu conjunto.The concept of the economist, rather than being a simple and evident one, is the object of numerous conflicting definitions. The example of the field of French economists, as analysed in a set of interviews and the observation of prospographical data, reveal certain characteristics of these conflicts. These struggles oppose those who detain differentiated forms of capital, which are themselves in correspondence with distinct positions in the field of power. These conflicts put into question both the autonomy and the structure of this scientific field. The relatively weak autonomy of the field of economical sciences is followed by a strong homology between the structure of this field and that of the field of French power in its entirety.
78 FR 34373 - Campo Verde Solar, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes...

Science.gov (United States)

2013-06-07

... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. ER13-1541-000] Campo Verde Solar, LLC; Supplemental Notice That Initial Market- Based Rate Filing Includes Request for Blanket Section 204 Authorization This is a supplemental notice in the above-referenced proceeding of Campo Verde...
Seed storage-mediated dormancy alleviation in Fabaceae from campo rupestre

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Naïla Nativel

2015-09-01

Full Text Available ABSTRACTWe studied the effects of seed storage on germination and dormancy alleviation in three species of Fabaceae endemic to campo rupestrein southeastern Brazil. Fresh seeds of Collaea cipoensis, Mimosa maguirei and Mimosa foliolosawere set to germinate and germination of seeds after four, five and 13 years of storage was tested. Seed viability was maintained for all species after the full storage period. Seed storage significantly increased germination percentage and decreased germination time for C. cipoensisand M. foliolosa, suggesting the alleviation of physical dormancy with storage. However, we did not find evidence of dormancy alleviation in M. maguirei since stored seeds showed a decrease in germination in comparison to that of fresh seeds. Our data indicate species-specific storage-mediated dormancy alleviation, which will have important implications for restoration of campo rupestre.
Origen de la gran industria en la comarca del Campo de Gibraltar

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María José Foncubierta Rodríguez

2010-11-01

Full Text Available Cuando en la década de los sesenta se pusieron en marcha los Planes Nacionales de Desarrollo, la comarca del Campo de Gibraltar vivía una situación de pobreza y de analfabetismo, caracterizada por la servidumbre de su población al uso militar de gran parte de su territorio, y a la presencia de la colonia británica de Gibraltar. La calificación como Zona de Preferente Localización Industrial, hizo que en el Arco de la Bahía de Algeciras se instalara un conjunto de grandes empresas que han transformado sensiblemente la comarca, en términos de empleo, económicos e incluso de cualificación de los ciudadanos. Palabras-clave: Grandes industrias, Campo de Gibraltar, Planes de Desarrollo, Bahía de Algeciras.___________________________ABSTRACT:When in the sixties are launched the National Development Plans, in order to avoid regional imbalance, the region of Campo de Gibraltar suffered a socio-economic situation of poverty and illiteracy, which was characterized by the easement to military use of its territory, and the presence of the British colony of Gibraltar. Its classification as Industrial Location Preferred Zone was the cause of a set of large companies to be installed at the Bay of Algeciras, which have significantly transformed the situation in this area, in terms of employment, economy, and even their people´s qualification.Keywords: Large industries, Campo de Gibraltar, Development Plans, Bay of Algeciras
Manual de métodos de campo para el monitoreo de aves terrestres

Science.gov (United States)

C. John Ralph; Geoffrey R. Geupel; Peter Pyle; Thomas E. Martin; David F DeSante; Borja Milá

1996-01-01

El presente manual es una recopilaciÃ³n de mÃ©todos de campo para la determinaciÃ³n de Ãndices de abundancia y datos demográficos de poblaciones de aves terrestres en una amplia variedad de hÃ¡bitats. EstÃ¡ dirigido a biÃ³logos, tÃ©cnicos de campo, e investigadores de cualquier parte del Continente Americano. Los mÃ©todos descritos incluyen cuatro tipos de censos...
Machine rates for selected forest harvesting machines

Science.gov (United States)

R.W. Brinker; J. Kinard; Robert Rummer; B. Lanford

2002-01-01

Very little new literature has been published on the subject of machine rates and machine cost analysis since 1989 when the Alabama Agricultural Experiment Station Circular 296, Machine Rates for Selected Forest Harvesting Machines, was originally published. Many machines discussed in the original publication have undergone substantial changes in various aspects, not...
Campos de golf y medio ambiente. Una interacción necesaria

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Cayetano Espejo Marín

2004-01-01

Full Text Available Desde finales de la década de los años ochenta del siglo pasado hay una preocupación generalizada por el impacto de los campos de golf sobre el medio ambiente. Varias Comunidades Autónomas españolas han redactado una normativa que permite controlar la incidencia de los campos de golf sobre dos aspectos fundamentales: las transformaciones paisajísticas y la procedencia del agua consumida. Las evaluaciones de impacto ambiental y el uso cada vez más generalizado de aguas depuradas contribuyen a minimizar los efectos sobre el entorno de estas instalaciones, que constituyen una interesante oferta turística de calidad sin estacionalidad.
El trabajo de campo: clave en la investigación cualitativa

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Virginia Inés Soto-Lesmes

2010-01-01

Full Text Available Objetivo: destacar la experiencia de la inserción al campo no sólo como la forma de recolectar información y determinar la calidad de los datos en que se basan los hallazgos, análisis y conclusiones, sino, también como elemento integrador del proceso de investigación que permita realizar una lectura de la realidad más específica. Método: a través de la investigación Experiencias de las adolescentes embarazadas en la localidad de Kennedy en la ciudad de Bogotá. Deseando el embarazo pero no tan pronto, se describen el estudio cualitativo y los antecedentes de la investigación, y se presentan las fases propias de la inserción. Conclusión: como método, la inserción al campo trasciende el acceso al dato; exige una acción dialéctica entre la teoría y la práctica, ya que el trabajo de campo requiere una formación teórico-metodológica y, al mismo tiempo, se sustenta en diversas técnicas y herramientas para la investigación.
Paleoenvironmental changes and influence on Operculodinium centrocarpum during the Quaternary in the Campos Basin, southwestern Brazil

Science.gov (United States)

Santos, Alessandra; de Araujo Carvalho, Marcelo; de Oliveira, Antônio Donizeti; Mendonça Filho, João Graciano

2017-12-01

The purpose of this paper is to document the changes observed in the Quaternary dinoflagellate assemblages from 80 core samples from the Campos Basin. The Interglacial (Subzone X1), Glacial (Subzones Y5 to Y2), Last Glacial Maximum (Subzone Y1) and Post-Glacial (Zone Z) intervals were identified. High abundance of Operculodinium centrocarpum suggests the warm, high salinity and nutrient-poor water conditions dominated the upper water column of the Campos Basin. The climate and oceanic current dynamic of the continental slope of the Campos Basin appears to has been a significant controlling factor in the distribution of dinocysts, particularly of O. centrocarpum, during the Pleistocene/Holocene transition.
OVERCOMING DORMANCY IN SANSÃO-DO-CAMPO (Mimosa caesalpiniaefolia L. SEEDS SUPERAÇÃO DE DORMÊNCIA EM SEMENTES DE SANSÃO-DO-CAMPO (Mimosa caesalpiniaefolia L.

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Eduardo Garcia Frasseto

2007-09-01

Full Text Available
The Sansão-do-campo, also known as sabiá, is a plant whose wood has multiple uses, besides its ornamental value. It is used in forestry, for hedges and as forage. The flowers are visited by bees and tree stalk bark is used to treat lung diseases. The Sansão-do-campo seeds have shown germination problems due to tegument impermeability. To study this problem an experiment was carried out with seeds collected in August 2000 in Jussara, Goiás State. Pure seed samples were immersed in sulfuric acid (H₂SO₄ P. A. for 0, 5, 10, 15, and 20 minutes and then washed in running water for 10 minutes to remove acid residues. Seeds were dried and then submitted to the standard germination test. Statistical analysis showed that H₂SO₄ immersion for 10 to 15 minutes resulted in the highest germination rate (98%.

KEY-WORDS: Sansão-do-campo; seeds; dormency.

O Sansão-do-campo é uma planta cuja madeira apresenta múltiplas utilidades, além de se constituir em planta ornamental. É usado para reflorestamentos e cercas vivas, e suas folhas constituem valiosa forragem. As sementes dessa espécie, entretanto, têm apresentado dificuldades de germinação em virtude da impermeabilidade do tegumento. Para a superar o problema, instalou-se um ensaio no Laboratório de Análise de Sementes da Universidade Federal de Goiás, com sementes colhidas na cidade de Jussara, Goiás, em agosto de 2000. As amostras de sementes foram submetidas a tratamento com ácido sulfúrico (H2SO4 P. A. por períodos de 0, 5, 10, 15 e 20 minutos e, posteriormente, ao teste-padrão de germinação. A análise dos dados revelou que a imersão das sementes em H2SO4 por um período de cinco a quinze minutos produziu a maior percentagem de germinação (98%.

Novo do velho: a poesia experimental dos poetas ensaístas Haroldo e Augusto de Campos

Directory of Open Access Journals (Sweden)

Carolina Tomasi

2015-07-01

Full Text Available To discuss sharp poetry of sound and visual expression, which shares the sense of renewing the old, but not strays from the old, or create the new, returning to the origin, is one of the main reasons of this article. More than baroque style in the twentieth century or break with the past, we investigated that the poets Haroldo de Campos, Augusto de Campos and Affonso Ávila share sharpness procedures that differ by participating in different discursive tenses, the baroque speech is one thing and the so called “new baroque” speech is another thing. Since then, the vanguard is no longer an operational category, but a point in the evolutionary line. We have thus a Haroldo de Campos that questions the literary history of Antonio Candido, proposing it not as a training but a transformation; less as a process that forms and more like a gerundive process, in which stand out the moments of rupture, understanding the tradition as a dialectical procedure, which puts diachrony and synchrony face to face. For exemplification of reflections we based on the poems “Oportet" by Haroldo de Campos and “Novo Novelo" by Augusto de Campos to discuss a recurrent theme in the literature: tradition and rupture, considering questionable the label "neo-baroque" in Brazilian literature.
DISTRIBUCIÓN ESPACIAL DEL AMACHAMIENTO DEL FRIJOL (Aphelenchoides besseyi CHRISTIE EN CAMPO

Directory of Open Access Journals (Sweden)

N\\u00E9stor Felipe Chaves-Barrantes

2014-01-01

Full Text Available El objetivo del presente trabajo fue determinar la distribución espacial del amachamiento en campo. La investigación se realizó entre mayo y julio del 2009 en las comunidades de Veracruz de Pérez Zeledón, San José y Concepción de Buenos Aires, Puntarenas, Costa Rica. Para ello se evaluó la incidencia de la enfermedad por punto de siembra en dos parcelas de frijol provenientes de distintas rotaciones (arroz/frijol y maíz/fri - jol, con lo cual, posteriormente se determinó la distribución espacial de la enfermedad en campo por medio de un análisis de corridas y los índices de varianza/media (V/M, Lloyd y Morisita. En el análisis de corridas se obtuvo un valor pro - medio de Z de -1,06 para la parcela sembrada previamente con arroz, y de -0,98 para la parcela sembrada previamente con maíz, lo que indica una tendencia a la agregación. Los índices de V/M, Lloyd y Morisita fueron mayores que 1 en ambas parcelas, por lo que se determinó que el amacha - miento presentó un patrón espacial agregado (en parches en condiciones de campo. El patrón espacial del amachamiento en campo tiende a enmascararse debido a la rotación con cultivos hospederos de Aphelenchoides besseyi , – su agente causal –, en especial la rotación maíz/frijol donde el produc - tor redistribuye el inóculo de la enfermedad cuando esparce las cañas de maíz sobre el terreno de cultivo
[A new machinability test machine and the machinability of composite resins for core built-up].

Science.gov (United States)

Iwasaki, N

2001-06-01

A new machinability test machine especially for dental materials was contrived. The purpose of this study was to evaluate the effects of grinding conditions on machinability of core built-up resins using this machine, and to confirm the relationship between machinability and other properties of composite resins. The experimental machinability test machine consisted of a dental air-turbine handpiece, a control weight unit, a driving unit of the stage fixing the test specimen, and so on. The machinability was evaluated as the change in volume after grinding using a diamond point. Five kinds of core built-up resins and human teeth were used in this study. The machinabilities of these composite resins increased with an increasing load during grinding, and decreased with repeated grinding. There was no obvious correlation between the machinability and Vickers' hardness; however, a negative correlation was observed between machinability and scratch width.
O campo magnético e a massa dos mésons

OpenAIRE

Camila Sampaio Machado

2013-01-01

Neste trabalho buscamos explorar os efeitos do campo magnético, criado em colisões de íons pesados não-centrais, em estados ligados. Motivados pelo caso do átomo de hidrogênio, onde a presença do campo magnético deixa o estado mais ligado,estudamos o caso dos mésons B e D. Inicialmente trabalhamos com a equação de Schrödinger e utilizamos o modelo de potencial de Cornell que faz uma boa descrição da espectroscopoia de mésons pesados. Em seguida, utilizando as regras de soma da QCD, procuram...
Projetos educativos para as populações do campo nos anos de 1950 e ProJovem Campo – Saberes da Terra: desenvolvimentismo e proposições dos organismos internacionais

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Angela Maria Hidalgo

2012-11-01

Full Text Available Para demonstrar os elementos de continuidade entre as propostas de educação do campo dos anos de 1950 e o Programa ProJovem Campo – Saberes da Terra na atualidade, relacionou-se o desenvolvimentismo ao papel dos organismos internacionais e aos projetos educativos nesses períodos. Explicitou-se, nos anos de 1950, a modernização da cultura das populações e das técnicas agrícolas como estratégias de obtenção dos benefícios sociais e controle dos movimentos camponeses. Já nas orientações dos organismos internacionais, a partir dos anos de 1990, revelou-se a ênfase na redução da pobreza e preservação do meio ambiente como condições para o desenvolvimento econômico, na proposta do desenvolvimento sustentável, em que o protagonismo dos movimentos sociais do campo é enfatizado. Abstract To demonstrate the elements of continuity between the proposed rural education program of the 1950s and ProJovem Campo Saberes da Terra today, we related developmentalism, the role of international organizations and educational projects in these periods. We made explicit in the 1950s, the modernization of the culture of the people and farming techniques, strategies for obtaining social benefits and control of peasant movements. As the guidelines of international organizations from the 1990s, we made explicit emphasis on poverty reduction and environmental protection as conditions for economic development, in the proposal of sustainable development, as the leadership of social movements is emphasized Keywords Education of the Countryside; Developmentalism; Rural Education; Social Movements and Education; International Organizations
Indagine critica sui modelli di atmosfera

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G. D'ELIA

1964-06-01

Full Text Available Nella prima parte del lavoro E individuato il modello
piu attendibile di atmosfera, clie deve dunque essere adottato nei calcoli
relativi a problemi aeronautici e missilistici.
Nella seconda parte vengono scritte le equazioni deH'atmosfera considerata
come campo fluidodinamico costituito da piu componenti elettricamente
conduttivi e reagenti. Con una serie di successive approssimazioni
sono derivate le equazioni sempliflcate clie attualmente sono usate per il
calcolo delle tabelle dell'atmosfera; da un sistema complesso di equazioni,
ma determinato matematicamente, si ottiene un sistema semplice, ma doppiamente
indeterminato; alia inderminatezza si deve sopperire con sondaggi
sperimentali.
Nell'ultima parte del lavoro si fa una critica alia base di calcolo del
piu attendibile modello, rilevando tra l'altro che esso e relativo alle condizioni
di un punto singolare (Port Churchill, nel Canada posto in prossimita
del polo magnetico.
Review of Nuria del Campo Martínez: Illocutionary Constructions in English: Cognitive Motivation and Linguistic Realization (2013)

DEFF Research Database (Denmark)

Jensen, Kim Ebensgaard

2014-01-01

A review of Nuria del Campo Martínez: Illocutionary Constructions in English: Cognitive Motivation and Linguistic Realization (2013)......A review of Nuria del Campo Martínez: Illocutionary Constructions in English: Cognitive Motivation and Linguistic Realization (2013)...
Influencia léxica del muisca en el español actual clasificada en campos semántico

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DIANA ANDREA GIRALDO GALLEGO

2014-01-01

Full Text Available La presencia léxica del muisca en el dialecto cundiboyacense es una muestra de que esta influencia aún sigue vigente. El objetivo de este artículo es presentar los préstamos y posibles préstamos del muisca en el español actual clasificados en campos semánticos. Los datos se recolectaron en los municipios de Machetá y Tibirita en el departamento de Cundinamarca; Guateque, Sutatenza, Guayatá, La Capilla, Garagoa, Chinavita y Pachavita en el departamento de Boyacá. Los resultados se organizaron en siete campos semánticos: campo y cultivo; minería; espacio; animales; familia y ciclo de vida; cuerpo humano; recipientes, alimentación y vivienda. Se concluyó que los campos que presentan una mayor influencia son los que corresponden a cultivo y animales.
Structural and Magnetic Studies on Iron Oxide Nanoparticles in Hybrid Matrices =

Science.gov (United States)

Silva, Nuno Joao de Oliveira

Este trabalho aborda algumas propriedades magneticas e estruturais de nanoparticulas de oxidos e oxidos-hidroxidos de ferro crescidos em matrizes hibridas orgânicas-inorgânicas. As matrizes hibridas, denominadas di-ureasils e obtidas pelo processo sol-gel, sao compostas por uma rede siliciosa ligada covalentemente por pontes ureia a cadeias orgânicas de diferente peso molecular. A estrutura local dos di-ureasils nao dopados esta modelada como grupos de dominios siliciosos com dimensoes nanometricas, estruturalmente correlacionados no seio de uma matriz rica em polimero. Neste trabalho mostra-se que os di-ureasils permitem o crescimento controlado de oxidos e oxidos-hidroxidos de ferro, incluindo a magnetite, maguemite, oxihidroxinitrato de ferro e ferrihidrite. O crescimento das nanoparticulas de ferrihidrite da-se em condicoes acidas a superficie dos dominios siliciosos, junto aos grupos carbonilo, que funcionam como pontos de nucleacao. Desse modo da-se uma nucleacao heterogenea, onde o tamanho das nanoparticulas depende da concentracao de ferro (entre 1 e 6% em massa), sendo a concentracao de particulas constante. As propriedades magneticas das nanoparticulas de ferrihidrite revelam a existencia de interaccoes antiferromagneticas e de momentos descompensados. A contribuicao destas duas componentes nas curvas de magnetizacao em funcao do campo magnetico pode ser separada usando um metodo aqui proposto, o que permite um adequado estudo da evolucao do momento magnetico com a temperatura. O estudo das propriedades magneticas dinâmicas das particulas de ferrihidrite, atraves de susceptibilidade ac, medidas de relaxacao e medidas de efeito Mossbauer, permitiu estudar a evolucao das interaccoes dipolares em funcao da concentracao de ferro, bem como determinar a distribuicao de barreiras de energia de anisotropia no caso em que essas interaccoes sao desprezaveis. E apresentado um novo metodo para comparacao desta distribuicao com a distribuicao de tamanhos, que
Spin-Transfer-Torque Nano-Oscillators: Fabrication, Characterization and Dynamics

Science.gov (United States)

Costa, Jose Diogo Teixeira Barbosa

Este trabalho aborda algumas propriedades magneticas e estruturais de nanoparticulas de oxidos e oxidos-hidroxidos de ferro crescidos em matrizes hibridas orgânicas-inorgânicas. As matrizes hibridas, denominadas di-ureasils e obtidas pelo processo sol-gel, sao compostas por uma rede siliciosa ligada covalentemente por pontes ureia a cadeias orgânicas de diferente peso molecular. A estrutura local dos di-ureasils nao dopados esta modelada como grupos de dominios siliciosos com dimensoes nanometricas, estruturalmente correlacionados no seio de uma matriz rica em polimero. Neste trabalho mostra-se que os di-ureasils permitem o crescimento controlado de oxidos e oxidos-hidroxidos de ferro, incluindo a magnetite, maguemite, oxihidroxinitrato de ferro e ferrihidrite. O crescimento das nanoparticulas de ferrihidrite da-se em condicoes acidas a superficie dos dominios siliciosos, junto aos grupos carbonilo, que funcionam como pontos de nucleacao. Desse modo da-se uma nucleacao heterogenea, onde o tamanho das nanoparticulas depende da concentracao de ferro (entre 1 e 6% em massa), sendo a concentracao de particulas constante. As propriedades magneticas das nanoparticulas de ferrihidrite revelam a existencia de interaccoes antiferromagneticas e de momentos descompensados. A contribuicao destas duas componentes nas curvas de magnetizacao em funcao do campo magnetico pode ser separada usando um metodo aqui proposto, o que permite um adequado estudo da evolucao do momento magnetico com a temperatura. O estudo das propriedades magneticas dinâmicas das particulas de ferrihidrite, atraves de susceptibilidade ac, medidas de relaxacao e medidas de efeito Mossbauer, permitiu estudar a evolucao das interaccoes dipolares em funcao da concentracao de ferro, bem como determinar a distribuicao de barreiras de energia de anisotropia no caso em que essas interaccoes sao desprezaveis. E apresentado um novo metodo para comparacao desta distribuicao com a distribuicao de tamanhos, que
Containment of Plasma Trapped in a Magnetic Well; Confinement d'un Plasma Piege dans un Puits Magnetique; Uderzhanie plazmy, zakhvachennoj v magnitnoj yame; Confinamiento de un Plasma Atrapado en un Pozo Magnetico

Energy Technology Data Exchange (ETDEWEB)

Francis, G.; Hill, J. W.; Mason, D. W. [United Kingdom Atomic Energy Authority, Culham Laboratory, Abingdon, Berks. (United Kingdom)

1966-04-15

'afflux de gaz par etuvage de la chambre ou par evaporation du lithium ont ete infructueux, mais le revetement de lithium presentait des signes de bombardement important le long des lignes cuspidees, entre les barres de Ioffe, Une boucle diamagnetique compensee placee a l'interieur de la chambre a vide a montre que la valeur de {beta}, pour le plasma piege, etait au moins de 0,1; au bout de 50 {mu}s, le diamagnetisme diminuait rapidement, confirmant que le signal prolonge provoque par les atomes neutres doit etre impute, pour une grande part, a l'afflux de gaz neutre. (author) [Spanish] En el trabajo descrito en la presente memoria, los autores emplean un campo magnetico convergente para guiar a lo largo de una lfnea de inyeccion el plasma proveniente de'un canon coaxial, conduciendolo hasta una camara de vacio central, de vidrio. En dicha camara, parte del plasma se refleja en un espejo magnetico y luego queda atrapado por la aplicacion de otro campo especular sometido a pulsaciones rapidas. Tambien es posible aplicar campos estabilizadores haciendo circular una corriente en seis barras de Ioffe paralelas al eje. Los campos de aumento rapido, permanecen aproximadamente constantes durante 1 ms. En anteriores experimentos con plasmas de 4 x 10{sup 10} cm{sup -3} de densidad media y 1 keV de energia ionica, se observo una inestabilidad giratoria con forma de estrias en una geometrfa especular simple, perdiendose el plasma en 60 {mu}s. En presencia de campos estabilizadores, el periodo de los iones de alta energia (medido por la emision de atomos neutros que han sufrido intercambio de cargas) aumento hasta 250 - 400 {mu}s. Este indice de decrecimiento fue mas elevado que el debido al intercambio de carga con una presion residual en el gas de 3 x 10{sup -7} Torr, lo que indica una gran afluencia transitoria de gas desde las paredes de la camara. Experimentos posteriores con plasmas de mayor densidad (n Tilde-Operator 10{sup 13} cm{sup -3}, #Greek Lunate Epsilon Symbol# Tilde
The Machine within the Machine

CERN Multimedia

Katarina Anthony

2014-01-01

Although Virtual Machines are widespread across CERN, you probably won't have heard of them unless you work for an experiment. Virtual machines - known as VMs - allow you to create a separate machine within your own, allowing you to run Linux on your Mac, or Windows on your Linux - whatever combination you need. Using a CERN Virtual Machine, a Linux analysis software runs on a Macbook. When it comes to LHC data, one of the primary issues collaborations face is the diversity of computing environments among collaborators spread across the world. What if an institute cannot run the analysis software because they use different operating systems? "That's where the CernVM project comes in," says Gerardo Ganis, PH-SFT staff member and leader of the CernVM project. "We were able to respond to experimentalists' concerns by providing a virtual machine package that could be used to run experiment software. This way, no matter what hardware they have ...
Uma abordagem sociológica da sociologia: a ciência como campo

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Vívian Matias dos Santos

2012-03-01

Full Text Available O presente ensaio objetiva analisar como o conceito de campo de Pierre Bourdieu pode contribuir para uma abordagem sociológica da Sociologia. A discussão desdobra-se desde a reflexão mais geral de como se firma a ciência até as possibilidades de compreensão da Sociologia neste espaço. Para tanto, fez-se necessário abordar o “campo científico” por meio das relações entre sua estrutura e seus agentes - relações “multidimensionais” que podem representar uma exitosa tentativa de superação da dicotomia ação/estrutura; indivíduo/sociedade; micro e macroteorização.
La noción de campo en Kurt Lewin y Pierre Bourdieu: un análisis comparativo

OpenAIRE

José Manuel Fernández Fernández; Aníbal Puente Ferreras

2009-01-01

La noción de campo desempeñó un papel central en los proyectos científicos de Kurt Lewin y Pierre Bourdieu. En este artículo hacemos un análisis comparativo del uso teórico y metodológico que hicieron de este concepto en la producción de su fecunda obra en los campos de la psicología y de la sociología, respectivamente. Para ello nos hemos centrado en cinco cuestiones cruciales que de modo explícito plantearon estos dos investigadores en la elaboración de su teoría de campo: la ruptura con la...
MITIGACIÓN DE CAMPO MAGNÉTICO DE LÍNEAS DE TRANSMISIÓN UTILIZANDO BUCLES PASIVOS MITIGAÇÃO DE CAMPO MAGNÉTICO DE LINHAS DE TRANSMISSÃO UTILIZANDO BUCLES PASSIVOS MAGNETIC FIELD MITIGATION OF TRANSMISSION LINES USING PASSIVE LOOPS

OpenAIRE

Diego Raúl Cadavid; David Alejandro Ramírez; Freddy Lopera; Andrés Felipe Correa

2010-01-01

En este artículo se presenta un método simple para determinar el campo magnético generado por líneas de transmisión. El cálculo del campo magnético tiene en cuenta los efectos de mitigación de bucles pasivos, incluyendo su ubicación óptima en la línea mediante la aplicación de algoritmos genéticos. Los resultados de los cálculos son validados mediante reportes de casos publicados en el IEEE, software de análisis de campo electromagnético y datos experimentales arrojados de una implementación ...
La comunicación: un campo de conocimiento en construcción Reflexiones sobre la comunicación social en Colombia

OpenAIRE

José Miguel Pereira

2005-01-01

Este artículo pretende dibujar y puntear un croquis del campo de la comunicación como campo de conocimiento y de formación de profesionales tomando a Colombia como caso específico. Aborda la comunicación como campo transdisciplinario, la tensión entre campo de investigación y de formación profesional, y hace una caracterización de la formación profesional en Comunicación Social y Periodismo en Colombia. Concluye que el nuevo contexto de la globalización y el marco de la f...
Calculation of electromagnetic fields in electric machines by means of the finite element. Computational aspects; Calculo de campos electromagneticos en maquinas electricas mediante elemento finito. Aspectos computacionales

Energy Technology Data Exchange (ETDEWEB)

Rosales, Mario; De la Torre, Octavio [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1990-12-31

In this article are described the computational characteristics of the Package CALIIE 2D of the Instituto de Investigaciones Electricas (IIE), for the calculation of bi-dimensional electromagnetic fields. The computational implementation of the package is based in the electromagnetic and numerical statements formerly published in this series. [Espanol] En este articulo se describen las caracteristicas computacionales del paquete CALIIE 2D del Instituto de Investigaciones Electricas (IIE), para calcular campos electromagneticos bidimensionales. La implantacion computacional del paquete se basa en los planteamientos electromagneticos y numericos antes publicados en esta serie.
Calculation of electromagnetic fields in electric machines by means of the finite element. Computational aspects; Calculo de campos electromagneticos en maquinas electricas mediante elemento finito. Aspectos computacionales

Energy Technology Data Exchange (ETDEWEB)

Rosales, Mario; De la Torre, Octavio [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1989-12-31

In this article are described the computational characteristics of the Package CALIIE 2D of the Instituto de Investigaciones Electricas (IIE), for the calculation of bi-dimensional electromagnetic fields. The computational implementation of the package is based in the electromagnetic and numerical statements formerly published in this series. [Espanol] En este articulo se describen las caracteristicas computacionales del paquete CALIIE 2D del Instituto de Investigaciones Electricas (IIE), para calcular campos electromagneticos bidimensionales. La implantacion computacional del paquete se basa en los planteamientos electromagneticos y numericos antes publicados en esta serie.
Effect of Machining Velocity in Nanoscale Machining Operations

International Nuclear Information System (INIS)

Islam, Sumaiya; Khondoker, Noman; Ibrahim, Raafat

2015-01-01

The aim of this study is to investigate the generated forces and deformations of single crystal Cu with (100), (110) and (111) crystallographic orientations at nanoscale machining operation. A nanoindenter equipped with nanoscratching attachment was used for machining operations and in-situ observation of a nano scale groove. As a machining parameter, the machining velocity was varied to measure the normal and cutting forces. At a fixed machining velocity, different levels of normal and cutting forces were generated due to different crystallographic orientations of the specimens. Moreover, after machining operation percentage of elastic recovery was measured and it was found that both the elastic and plastic deformations were responsible for producing a nano scale groove within the range of machining velocities from 250-1000 nm/s. (paper)
ELECTRICAL PROPERTIES OF Cr/CrN NANO-MULTILAYERS PRODUCED BY THE UNBALANCED MAGNETRON SPUTTERING TECHNIQUE

Directory of Open Access Journals (Sweden)

DIANA MARITZA MARULANDA CARDONA

2011-01-01

Full Text Available Peliculas de nitruro de cromo (CrN se han aplicado como recubrimientos protectores contra el desgaste y la corrosion debido a sus excelentes propiedades mecanicas y alta resistencia a la corrosion, y en el campo electronico debido a su baja resistividad. Sin embargo, se ha encontrado que las multicapas que combinan peliculas metal/ceramico podrian mejorar las propiedades en comparacion a sus contrapartes en monocapa debido al aumento e interaccion entre interfaces. En este trabajo se produjeron nano-multicapas de Cr/CrN a traves de la tecnica de sputtering con magnetron desbalanceado con tres grados de desbalanceo diferentes para estudiar la influencia de este parametro en las propiedades electricas. Se crecieron multicapas con un espesor total de aproximadamente 1 microm y un periodo de bicapa (A de 200 nm, 100 nm y 20 nm. Las multicapas se produjeron a temperatura ambiente sobre acero H13 y silicio (100 y se estudio su microestructura y las propiedades electricas en funcion del campo magnetico. La formacion de fases se caracterizo a traves de Difraccion de Rayos X y los resultados muestran las orientaciones (111 y (200 para todas las multicapas. Se obtuvieron imagenes de la seccion transversal a traves de Microscopia Electronica de Barrido y los resultados muestran la formacion de una estructura en multicapas.

Nefrectomia videolaparoscópica em Graxaim-do-campo (Pseudalopex gymnocercus com displasia renal

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João P.S. Feranti

2014-08-01

Full Text Available Graxains-do-campo habitam o centro-leste da América do Sul, desde o sudeste do Brasil e leste da Bolívia. A displasia renal compreende um espectro de anomalias e é frequentemente relatada em cães de diversas raças, sendo a maioria dos relatos achados de necropsia. A maior parte das doenças renais congênitas nos cães apresenta caráter progressivo, portanto o tratamento é limitado e direcionado a fim de retardar a progressão da doença renal estabelecida. No presente relato é descrita a realização de nefrectomia laparoscópica em graxaim-do-campo (Pseudalopex gymnocercus com displasia renal. Suspeitou-se de doença no rim direito por meio de ultrassonografia e urografia excretora. Para o procedimento cirúrgico foram utilizados três portais (10, 10, 5mm, endoscópio rígido de 10mm/0(0 e clipes para hemostasia dos vasos renais. A técnica cirúrgica utilizada neste canídeo selvagem foi semelhante à usada em cão doméstico, devido à escassez de relatos em cirurgias em graxaim e a inexistência de descrições de nefrectomia videolaparoscópica em graxaim-do-campo. O animal foi acompanhado por um período de 30 dias pós-cirurgia sem a ocorrência de complicações. O presente relato demonstra que a técnica proposta foi adequada para a realização de nefrectomia videolaparoscópica em Graxaim-do-campo.
Espacio y desaparición: los campos de concentración en Argentina

Directory of Open Access Journals (Sweden)

Colombo, Pamela

2011-12-01

Full Text Available The main goal of this article is to investigate how the use of forced disappearances in Argentina (1974-1983 caused modifications to the unique spatial characteristics of their concentration camps. Specifically, I analyze three aspects: the removal within the camps of spatial-temporal references to the disappeared persons, the manner in which these victims remain present within the camps despite their disappearance, and the manner in which the outside space penetrates and superimposes itself upon the camp. This analysis is upheld by personal in depth interviews I had in Tucumán with relatives of the Disappeared and with survivors of the concentration camps.

Partiendo de la hipótesis de que la técnica aniquilación por desaparición forzada de personas en Argentina (1974-1983 reconfiguró el espacio; el trabajo que desarrollo en el presente artículo consiste en indagar acerca de las particularidades de la dimensión espacial en los campos de concentración en Tucumán. El análisis gira en torno a tres ejes centrales: la negación de las referencias espacio-temporales a los detenidos-desaparecidos dentro del campo; el modo en que los desaparecidos «a pesar de todo» se representan un espacio y un tiempo concentracionario; y por último, el modo en que superponen e interpenetran los espacios del afuera con el adentro del campo. Este trabajo de análisis se sustenta en entrevistas en profundidad que he realizado a familiares de desaparecidos y sobrevivientes de campos de concentración en Tucumán.
Aegla rosanae Campos Jr., um novo sinônimo de Aegla paulensis Schmitt (Crustacea, Aeglidae Aegla rosanae Campos Jr., a new synonym of Aegla paulensis Schmitt (Crustacea, Aeglidae

Directory of Open Access Journals (Sweden)

Georgina Bond-Buckup

2000-06-01

Full Text Available The validity of Aegla rosanae Campos Jr., 1998 as a new species was analysed. On the basis of comparisons with Aegla paulensis Schmitt, A. rosanae was considered its junior synonym.
A experiência de egressos de uma escola do campo no município de Araraquara - SP

OpenAIRE

Fabio Monari Paiva

2015-01-01

A oferta da educação básica à população do campo no Brasil se caracteriza por uma precariedade histórica. Não obstante, entre as reivindicações e conquistas dos movimentos sociais pró reforma agrária, acentuadamente da segunda metade da década de 1980 em diante, destacaram-se os esforços para a construção de uma escola que atendesse a população do campo, comprometendo-se com os ideais de luta pela terra e igualdade social, visando a conscientização do homem do campo em relação aos seus direit...
Voces en un campo de sangre: Max Aub y los penúltimos episodios nacionales

Directory of Open Access Journals (Sweden)

Joan Oleza Simó

2002-11-01

Full Text Available Certain reading of postmodernity has diagnosed (actually, offered the end of history, and therefore the end of historical novel, although some of us choose not to bury it but to bring it to live again. Within the context of this debate it is worth to stop at Max Aub's Laberinto mágico, which is a Spanish Civil War magnificent mural as well as one of the last manifestation of the pure model of national episode, Galdós and Valle Inclán's ultimate legacy. In spite of containing apparent heterogeneous elements, the historical and ideological signs in Campo cerrado (1939 are the ones of modern historical novel. In the following campos, Aub's historical-novel formula reached its maturity, Campo del moro (1963 possibly being the most brilliant and balanced example in this modality among the novels of the series. In it, the of history announced in, Campo del moro banishes away as a victim of treason and shocked by the madness that grows on Madrid's streets. Campo del moro could be considered a pure historical novel, since the necessary felicity conditions are accomplished, causing this genre to be completely fulfilled: historicity of the events and respect for the chronological order in which they occur; fiction limited by the historical referent; initiative of the historical events over fiction, and power of the public logic over the private; and last but not least, narrativity of the events manifestated in the selection of the golpe de estado of Casado and Besteiro and their enlightment as the key to the historical story. Three are the big issues that are presented in the argumental logic of the novel: treason, the confusion in the maze and the heroic cause degradation. ln Max Aub's speech, which feeds the novel, fiction, reality and history are weaved together to the point of creating Ariadna's in the Maze.
The Inner Ear. About the Meeting between Cristina Campo, María Zambrano and Marius Schneider

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Victoria Cirlot

2015-02-01

Full Text Available This text concernes the encounter, anecdotic as well as theoric, of CristinaCampo, María Zambrano and Marius Schneider. The author refers to the inklingsof the contact between them (the colaboration in Sur and Conoscenzareligiosa magazines, the frequenting of Campo and Schneider, the correspondencebetween her and Zambrano, nevertheless, she also signs the shared interestin the organ of hearing, in addition to the similarities of thought fromtheir respective disciplines: the symbolic approach to the auditive organ, itssuperiority over vision, the associations between music and word, the antithesisamong music and stone, the complementing between internal hearing anddestiny, as well as the need of an attentive audition to listen to the internal voice and one’s destiny. In the case of Cristina Campo, the musicality of herwriting style is also discussed.
Numerical simulation of TIG welding with filler of steel pieces of high thickness

Energy Technology Data Exchange (ETDEWEB)

Carmignani, B.; Toselli, G. [ENEA Centro Ricerche Ezio Clementel, Bologna (Italy). Dipt. Innovazione

1999-07-01

The problem of the numerical simulation of welding process with filler, in particular TIG (tungsten inert gas) with cold filler, has been approached with ABAQUS/S code. Reference has been made to some experimental models studied and prepared ad hoc in order to better know the physical phenomena involved in the TIG welding technique and to validate the computation methodologies and results obtained. This numerical simulation has been required in order to assist the fabrication development and QA for TF (toroidal field) coil case, an important component of ITER (international thermonuclear experimental reactor) machine. [Italian] Con il codice di analisi termo-strutturale non lineare agli EF, ABAQUS/S, viene affrontato per la prima volta il problema della simulazione numerica di un processo di saldatura con materiale d'apporto, in particolare il processo di saldatura TIG (tungsten inert gas) a filo freddo. Si e' fatto riferimento ad alcuni modelli sperimentali studiati e preparati ad hoc per conoscere meglio e valutare le metodologie di calcolo adottate ed i corrispondenti risultati ottenuti. Questo tipo di simulazione e' stato richiesto per fornire alcune conoscenze preliminari, che potessero essere di aiuto e guida nelle scelte di saldatura da eseguire per la fabbricazione e la quality assurance delle casse che dovranno contenere le bobine per la creazione del campo magnetico toroidale nella macchina ITER (international thermonuclear experiemental reactor) per la fusione nucleare. In questo lavoro, sono presentati, analizzati, discussi e confrontati con le corrispondenti misure sperimentali i primi risultati ottenuti. Sono descritte e discusse anche le difficolta' incontrate, le approssimazioni fatte e la ricerca di procedure di calcolo piu' semplificate.
Prediction of Machine Tool Condition Using Support Vector Machine

International Nuclear Information System (INIS)

Wang Peigong; Meng Qingfeng; Zhao Jian; Li Junjie; Wang Xiufeng

2011-01-01

Condition monitoring and predicting of CNC machine tools are investigated in this paper. Considering the CNC machine tools are often small numbers of samples, a condition predicting method for CNC machine tools based on support vector machines (SVMs) is proposed, then one-step and multi-step condition prediction models are constructed. The support vector machines prediction models are used to predict the trends of working condition of a certain type of CNC worm wheel and gear grinding machine by applying sequence data of vibration signal, which is collected during machine processing. And the relationship between different eigenvalue in CNC vibration signal and machining quality is discussed. The test result shows that the trend of vibration signal Peak-to-peak value in surface normal direction is most relevant to the trend of surface roughness value. In trends prediction of working condition, support vector machine has higher prediction accuracy both in the short term ('One-step') and long term (multi-step) prediction compared to autoregressive (AR) model and the RBF neural network. Experimental results show that it is feasible to apply support vector machine to CNC machine tool condition prediction.
Relação entre o estilo cognitivo dependência-independência de campo e prática desportiva

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Magalhães, Mauro Oliveira

2010-01-01

Full Text Available Esta pesquisa investigou a relação entre o estilo cognitivo dependência-independência de campo e a prática de esportes de habilidades abertas ou fechadas. Os esportes de habilidades abertas caracterizam-se pela interação de adversários em jogo, e os de habilidades fechadas pela ausência de perturbação externa sobre o desempenho do atleta. A dependência-independência de campo é uma dimensão de estilo cognitivo associada ao grau de diferenciação das fronteiras corporais. O Teste de Figuras Mascaradas (GEFT foi aplicado em 149 sujeitos, 84 atletas de esportes de habilidades abertas e 65 de habilidades fechadas, 77 homens e 72 mulheres. Homens em esportes de habilidades fechadas mostraram-se mais independentes de campo do que os de habilidades abertas; esta diferença não ocorreu no grupo feminino. Entre os atletas de habilidades abertas, mulheres revelaram maior independência de campo do que homens. Conclui-se que há interação entre sexo e tipo de esporte para diferenças em independência de campo
Anomalous Escape of Ions into the ''Loss Cone''; Sortie Anormale d'Ions dans Le Cone de Pert; Anomal'nyj ukhod ionov v konus poter'; Escape Anomalo de Iones al Cono de Perdid

Energy Technology Data Exchange (ETDEWEB)

Galeev, A. A. [Institut Jadernoj Fiziki so AN SSSR, Novosibirsk, SSSR (Russian Federation)

1966-04-15

uniformidad del plasma confinado en una trampa con espejos magneticos da lugar a la formacion de,inestabilidad es de las clases 'estriada', 'universal ' y anisotropa, las cuales limitan sustancialmente el tiempo de confinamiento de las particulas. Segun se interpreta actualmente la inestabilidad estriada, puede eliminarse utilizando una geometria del campo magnetico de tipo especial (que se denomina configuracion de B minimo). La inestabilidad universal, debida a la falta de homogeneidad en la distribucion del plasma en direccion transversal al campo magnetico, tambien se estabiliza con un cruzamiento relativamente pecuieno de las lineas de fuerza del campo magnetico. Por otro lado, Rosenbluth y Post observaron recientemente que, en un plasma de suficiente densidad n Greater-Than-Or-Equivalent-To 10{sup 13} cm{sup -3}, y longitud L Greater-Than-Or-Equivalent-To 10{sup 4{lambda}}{sub D} ({lambda}{sub D} = radio de Debye), incluso una pequena anisotropia de la descripcion de velocidades de los iones, por la presencia de un 'cono de perdidas ' da origen al desarrollo de una inestabilidad de onda corta. En la memoria se analiza por tanto detalladamente el espectro del movimiento turbulento que aparece-y los procesos anomalos de transporte en el plasma inestable. En las trampas de longitud total L resulta que la difusion anormalmente rapida de las particulas al cono de perdidas hace que este se llene y la inestabilidad disminuye. Esto permite aprovechar, para la descripcion de los procesos turbulentos del transporte, la teoria cuasilineal, complementada con la ecuacion cinetica de la densidad energetica de las oscilaciones del plasma. La escala maxima de las pulsaciones transmitidas se determina basandose en la condicion de la pequenez de su amortiguamiento en la legion de los extremos de la trampa, donde la velocidad de fase es com parable con la velocidad termica media de los electrones. Por lo tanto, el tiempo de salida al cono de perdidas a causa de la dispersion de los iones
Environmentally Friendly Machining

CERN Document Server

Dixit, U S; Davim, J Paulo

2012-01-01

Environment-Friendly Machining provides an in-depth overview of environmentally-friendly machining processes, covering numerous different types of machining in order to identify which practice is the most environmentally sustainable. The book discusses three systems at length: machining with minimal cutting fluid, air-cooled machining and dry machining. Also covered is a way to conserve energy during machining processes, along with useful data and detailed descriptions for developing and utilizing the most efficient modern machining tools. Researchers and engineers looking for sustainable machining solutions will find Environment-Friendly Machining to be a useful volume.
Bit keskus. (Uuendusliku Tehnoloogia Keskus) Inca, Mallorca, Hispaania / Alberto Campo Baeza

Index Scriptorium Estoniae

Campo Baeza, Alberto

1998-01-01

High-tech büroo kolmnurksel krundil industriaalpargis. Krundi sisemuses suletud alal "salaaed" apelsinipuudega. Seintel ronivad aromaatse lõhnaga taimed: jasmiinid, vistaaria, viinapuud. Konkurss 1995, ehitus 1997-1998. Arhitekt Alberto Campo Baeza (koos: L. Ignacio Aguirre Lopez, Anton Garcia Abril, Antonio Perez Villegas)
Calculation of electromagnetic fields in electric machines by means of the finite element. Algorithms for the solution of problems with known total densities. Pt. 2; Calculo de campos electromagneticos en maquinas electricas mediante elemento finito. Algoritmos para la solucion de problemas con densidades totales conocidas. Pt. 2

Energy Technology Data Exchange (ETDEWEB)

Rosales, Mauricio F [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1988-12-31

This article is based in the electromagnetic modeling presented in the first part. Here are only considered the magnetic systems or electric systems in closed regions with moving or axial symmetry, whose total current density or total electric load density is known. The algorithms that have been implanted in the software CLIIE-2D of the Instituto de Investigaciones Electricas (IIE) are developed in order to obtain numerical solutions for these problems. The basic systems of algebraic equations are obtained by means of the application of the Galerkin method in the discreteness of the finite element with first order triangular elements. [Espanol] Este articulo se basa en la modelacion electromagnetica presentada en la primera parte. Aqui solo se consideran sistemas magneticos o sistemas electricos en regiones cerradas con simetria translacional o axial, cuya densidad de corriente total o densidad de carga electrica total es conocida. Se desarrollan los algoritmos que se han implantado en el programa de computo CLIIE-2D, del Instituto de Investigaciones Electricas (IIE) con el fin de obtener soluciones numericas para estos problemas. Los sistemas basicos de ecuaciones algebraicas se obtienen mediante la aplicacion del metodo de Galerkin en la discretizacion de elemento finito con elementos triangulares de primer orden.
Calculation of electromagnetic fields in electric machines by means of the finite element. Algorithms for the solution of problems with known total densities. Pt. 2; Calculo de campos electromagneticos en maquinas electricas mediante elemento finito. Algoritmos para la solucion de problemas con densidades totales conocidas. Pt. 2

Energy Technology Data Exchange (ETDEWEB)

Rosales, Mauricio F. [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1987-12-31

This article is based in the electromagnetic modeling presented in the first part. Here are only considered the magnetic systems or electric systems in closed regions with moving or axial symmetry, whose total current density or total electric load density is known. The algorithms that have been implanted in the software CLIIE-2D of the Instituto de Investigaciones Electricas (IIE) are developed in order to obtain numerical solutions for these problems. The basic systems of algebraic equations are obtained by means of the application of the Galerkin method in the discreteness of the finite element with first order triangular elements. [Espanol] Este articulo se basa en la modelacion electromagnetica presentada en la primera parte. Aqui solo se consideran sistemas magneticos o sistemas electricos en regiones cerradas con simetria translacional o axial, cuya densidad de corriente total o densidad de carga electrica total es conocida. Se desarrollan los algoritmos que se han implantado en el programa de computo CLIIE-2D, del Instituto de Investigaciones Electricas (IIE) con el fin de obtener soluciones numericas para estos problemas. Los sistemas basicos de ecuaciones algebraicas se obtienen mediante la aplicacion del metodo de Galerkin en la discretizacion de elemento finito con elementos triangulares de primer orden.
Desenvolvimento de um sensor de campo eletrico alternado com transmissão por fibra-optica

OpenAIRE

Swinka Filho, Vitoldo

1996-01-01

Orientador: Rene Robert Dissertação (mestrado) - Universidade Federal do Parana Resumo: Neste trabalho e mostrado o desenvolvimento de um sensor de campo elétrico que utiliza o principio da carga induzida por campo elétrico alternado em superfícies condutoras. O sensor e composto por duas semi-esferas de alumínio isoladas eletricamente e possui um circuito eletrônico incorporado alimentado por baterias, e um sistema de transmissão por fibraoptica ligado a uma unidade remota para leitura...
Pesquisa de campo qualitativa: uma vivência em geografia humanista

Directory of Open Access Journals (Sweden)

Rita Jaqueline Nogueira Chiapetti

2011-01-01

Full Text Available O objetivo deste artigo é descrever a experiência de uma pesquisa de campo qualitativa em Geografia, com uma abordagem humanista. A pesquisa de campo foi feita no município de Itacaré, sul do estado da Bahia, com o propósito compreender como os sujeitos de Itacaré percebem o rio das Contas, qual é o significado do rio para eles. Como método de pesquisa de campo, optamos pela história oral e pelas técnicas da entrevista, da observação e, ainda, pelo registro de paisagens através de fotografias. A nossa presença em Itacaré foi importante para o êxito da pesquisa porque pudemos conhecer melhor as pessoas e o seu cotidiano, fato que contribuiu para a qualidade das informações contidas nas 41 entrevistas feitas. Também, essa convivência com as pessoas do lugar foi uma grande experiência vivida na perspectiva da Geografia Humanista. Abstract QUALITATIVE FIELD RESEARCH: EXPERIENCE IN HUMANISTIC GEOGRAPHY This paper aims at describing the experience of a qualitative field research in Geography under a humanistic approach. The field research was carried out in Itacaré, located in the south of Bahia state, aiming at understanding how the individuals from Itacaré perceive Rio das Contas, what the river means to them. We have chosen oral history as field research method and the techniques of oral interview, observation and the record of landscapes through photography. Our presence in Itacaré was critical for the field research’s success as we could get to know better the people and their everyday life, which contributed for the quality of the information contained in the 41 oral interviews collected. Also, staying with these people was a valuable experience under the Humanistic Geography perspective.
Hybrid machining processes perspectives on machining and finishing

CERN Document Server

Gupta, Kapil; Laubscher, R F

2016-01-01

This book describes various hybrid machining and finishing processes. It gives a critical review of the past work based on them as well as the current trends and research directions. For each hybrid machining process presented, the authors list the method of material removal, machining system, process variables and applications. This book provides a deep understanding of the need, application and mechanism of hybrid machining processes.
Actual stage of organic geochemical knowledge from Campos and Espirito Santo basins, Brazil

International Nuclear Information System (INIS)

Gaglianone, P.C.; Trindade, L.A.F.

1987-01-01

Campos and Espirito Santo basins display several similar geochemical aspects. The microbial and other degradation processes caused changes in the composition of the oils in the reservoir rocks. The oils are biodegraded in different degrees, with the reservoir temperature developing an important role in the control of the biodegradation process. The migration pathway model is similar for Campos and Espirito Santo basins, involving the upward secondary migration through a window in the evaporitic seals. The oils passed to the marine sequence where migration and accumulation were controlled by faults, regional unconformities and by reservoirs. The geochemical correlation of oils are realized by gaseous and liquid chromatography analysis, carbon isotopes and biolabelled compounds. (author)
A FORMAÇÃO DE EDUCADORES DO CAMPO NO PARANÁ NO ÂMBITO DO PRONERA E DA LUTA PELO DIREITO À EDUCAÇÃO

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Alex Verdério

2013-12-01

Full Text Available O presente artigo apresenta uma breve reflexão acerca da formação de educadores do campo no contexto do Programa Nacional de Educação na Reforma Agrária (PRONERA tendo como referências a luta pelo direito à educação e a luta por uma Educação do Campo. Como objeto de análise toma-se as duas primeiras turmas de Pedagogia para Educadores do Campo no Paraná, ocorridas entre os anos de 2004 e 2012, que estando ancoradas no protagonismo do Movimento dos Trabalhadores Rurais Sem Terra (MST foram concretizadas através de convênios firmados entre o PRONERA e a Universidade Estadual do Oeste do Paraná (UNIOESTE. No processo de sistematização evidenciou-se a importância do PRONERA para garantia do direito dos povos trabalhadores do campo à educação e a especificidade do curso de Pedagogia para Educadores do Campo que é um curso estruturado sob o regime de alternância, constituído no contexto da luta por uma Educação do Campo. A reflexão assume como foco a luta pelo direito à educação, a atuação efetiva dos povos trabalhadores do campo neste âmbito, o que passa pela relação entre Movimento Social e Universidade no sentido de propor e fazer a formação de educadores do campo articulada à luta por uma Educação do Campo.
O Movimento dos Pequenos Agricultores na interface entre agricultura familiar e educação do campo

Directory of Open Access Journals (Sweden)

Ramofly Bicalho Santos

2017-04-01

Full Text Available O artigo em questão é fruto das pesquisas desenvolvidas pelo Programa de Educação Tutorial – PET Educação do Campo e Movimentos Sociais na UFRRJ – Universidade Federal Rural do Rio de Janeiro. Ele aborda o protagonismo do MPA – Movimento dos Pequenos Agricultores, na interface entre agricultura familiar e educação do campo. Trabalhamos com o plano camponês, uma das principais armas do MPA. Ele representa um contraponto à incapacidade estatal na criação de leis que apoiem os pequenos agricultores. Desenvolvemos uma pesquisa bibliográfica e documental, utilizando as seguintes fontes de investigação: legislações, portarias, decretos e referenciais sobre educação do campo no Brasil. Utilizamos ainda os dados do censo agropecuário de 2006, ressaltando o valor da agricultura familiar na mesa do brasileiro. Nesse contexto, verificamos que o processo de ensino e aprendizagem deve dialogar com a realidade concreta dos sujeitos, individuais e coletivos, articulados com a luta pela terra. Concluímos que a produção coletiva do saber em parceria com educandos/as, educadores/as, comunidades e os movimentos sociais de luta pela terra, pode dialogar com histórias, memórias, identidades, desejos, valores e reconhecimento, fortalecendo o debate em torno da educação do campo, na sua estreita relação com movimentos sociais, escolas do campo e universidades públicas.

A psicologia e a constituição do campo educacional brasileiro La psicología y la constitución del campo de educación brasileño The psychology and the constitution of the brazilian education field

Directory of Open Access Journals (Sweden)

Ana Paola Sganderla

2010-03-01

Full Text Available O presente artigo tem por objetivo discutir como a Psicologia contribuiu para a formação do campo educacional brasileiro início do século XX. Ao mesmo tempo, o campo educacional forneceu elementos fundamentais que serviram de base à constituição dessa ciência como campo científico reconhecido no País. Como base teórica para a investigação, utilizamos o conceito de campo social de Pierre Bourdieu, relacionando as implicações práticas presentes nesta constituição: Intelectualidade influente; estruturação de associações profissionais; formação e profissionalização docente e produção de conhecimentos teóricos e técnicos na área. Neste cenário, a Psicologia contribuiu para a constituição do campo educacional brasileiro como uma das ciências que balizou a formação de professores e as discussões educacionais e Lourenço Filho como um dos intelectuais de maior produção e disseminação dos conhecimentos psicológicos.El artículo presente tiene como objetivo discutir como la Psicología contribuyó para la formación del campo de educación brasileña al inicio del siglo XX. Al mismo tiempo, el campo de educación proporcionó elementos fundamentales que ellos sirvieron como la base a la constitución de esa ciencia como el campo científico reconocidos al País. Como la base teórica para la investigación, nosotros usamos el concepto de campo social de Pierre Bourdieu, mientras relacionando las implicaciones prácticas presentes en esta constitución: La intelectualidad influyente; estructurando asociaciones profesionales; la formación y la enseñanza profesionalización y producción de conocimiento teórico y técnico en el área. En este paisaje, la Psicología contribuyó a la constitución del campo de educación brasileña como una de las ciencias que la formación de los maestros y las discusiones de educación y Lourenço Filho como uno de los intelectuales de producción más grande y cobertor del
Enseñanza del campo eléctrico mediante el uso de simulaciones computacionales

OpenAIRE

Alzugaray, Gloria E.; Carreri, Ricardo A.; Marino, Luis A.

2009-01-01

El objetivo de este trabajo es proponer el abordaje del campo eléctrico a partir de un modelo de guía didáctica basada en el uso de un programa de simulación de libre acceso, aplicado en las actividades de trabajos prácticos de la asignatura Física Eléctrica. La formulación de la guía didáctica fue diseñada con el fin de favorecer la construcción significativa de conocimientos en el área electromagnetismo, en particular relacionado a los siguientes contenidos: ley de Coulomb, campo eléctri...
Mitigación de campo magnético de líneas de transmisión utilizando bucles pasivos

OpenAIRE

Cadavid, D. R. (Diego Raúl); Ramírez, D. A. (Diego Alejandro); Lopera, F. (Freddy); Correa, A. F. (Andrés Felipe)

2009-01-01

En este artículo se presenta un método simple para determinar el campo magnético generado por líneas de transmisión. El cálculo del campo magnético tiene en cuenta los efectos de mitigación de bucles pasivos, incluyendo su ubicación óptima en la línea mediante la aplicación de algoritmos genéticos. Los resultados de los cálculos son validados mediante reportes de casos publicados en el IEEE, software de análisis de campo electromagnético y datos experimentales arrojados de una implementación ...
Machine terms dictionary

Energy Technology Data Exchange (ETDEWEB)

NONE

1979-04-15

This book gives descriptions of machine terms which includes machine design, drawing, the method of machine, machine tools, machine materials, automobile, measuring and controlling, electricity, basic of electron, information technology, quality assurance, Auto CAD and FA terms and important formula of mechanical engineering.
Génesis del campo de Internet en Colombia: elaboración estatal de las relaciones informacionales

Directory of Open Access Journals (Sweden)

Camilo Andrés Tamayo

2009-01-01

Full Text Available El artículo analiza, siguiendo la propuesta de Pierre Bourdieu, las relaciones sociales que permitieron la emergencia del campo de Internet en Colombia. Aborda el período 1986-2007, para demostrar cómo el Estado fue el principal agente encargado de operar sobre un conjunto de condiciones que le posibilitó a un determinado grupo competir entre sí y encontrarse bajo la forma de relaciones de oferta y demanda. El documento está dividido en tres partes que reseñan el contexto de apertura económica y liberalización del mercado, la creación de la Comisión de Regulación de Telecomunicaciones y el Ministerio de Comunicaciones y las dinámicas más recientes que han permitido que el campo de internet se disuelva en el campo más amplio de las telecomunicaciones, a través del proceso de convergencia de servicios.
Some relations between quantum Turing machines and Turing machines

OpenAIRE

Sicard, Andrés; Vélez, Mario

1999-01-01

For quantum Turing machines we present three elements: Its components, its time evolution operator and its local transition function. The components are related with the components of deterministic Turing machines, the time evolution operator is related with the evolution of reversible Turing machines and the local transition function is related with the transition function of probabilistic and reversible Turing machines.
La crisis del campo periodístico-mediático en el marco de las luchas entre proyectos estratégicos en la Argentina

Directory of Open Access Journals (Sweden)

Gabriel Esteban Merino

2011-06-01

Full Text Available Normal 0 21 false false false MicrosoftInternetExplorer4 La situación política de agudización del enfrentamiento entre intereses, proyectos, modelos, ideas, visiones y representaciones en Argentina y Latinoamérica, y el impulso, en este escenario de transformación, de la Ley de Servicios Audiovisuales que afecta directamente el núcleo de la estructura mediática en Argentina, puso en crisis y convulsionó lo que Bourdieu denomina “campo periodístico”, que aquí denominamos como campo mediático. Esta crisis está relacionada con el profundo entrecruzamiento del campo periodístico-mediático (a partir de su avance con otros campos del espacio social, pero especialmente con el campo político.
Sources of basalt suites in the Campos and Pelotas basins (South-Southeast of Brazil) and geo dynamic breakup models for Western Gondwana; Tipos de fontes associadas as suites basalticas de Campos e de Pelotas (Sul-Sudeste) e modelos geodinamicos de ruptura do Gondwana ocidental

Energy Technology Data Exchange (ETDEWEB)

Lobo, Janaina Teixeira; Valente, Sergio de Castro; Szatmari, Peter; Duarte, Beatriz Paschoal [Universidade Estadual do Rio de Janeiro, RJ (Brazil). Faculdade de Geologia. Pos-graduacao]. E-mail: janaina_lobo@hotmail.com

2006-05-15

Based essentially on geochemical data, this work aims at defining constrain to the petrogenesis of the Eocretacious basalts from the Campos and Pelotas marginal rift basins (South-Southeast Brazil). Geochemical modeling, including quantification of mantle sources and binary mixing methods, were performed in order to contribute to the elaboration of geo dynamic models related to the initial stages of Gondwana breakup. Basalts from Campos and Pelotas basins comprise two transitional series with tholeiitic affinities. All basalts from the Campos Basin can be assigned to a low-TiO2 suite (TiO2 1.20 +- 0.12 wt %; Ti/Y = 272); whereas basalts from the Pelotas Basin comprise a low-(TiO2 = 1.19 +- 0.02 wt %; Ti/Y = 288) and a high-TiO2 suites (TiO2 = 2.10 +- 0.19 wt %; Ti/Y = 387). Non-modal batch partial melting modeling showed that the La/YbN = 5.78 generation ratio of the Campos Basin suite was obtained from 21% of partial melting of lherzolite garnet. The same model required a source with smaller amounts of garnet (melted at 28%) to generate the La/YbN generation ratio of the low-TiO2 suite of the Pelotas Basin. Larger amounts of grenade and less partial melting (22%) were necessary to generate the La/YbN ratio of the high-TiO2 suite of the Pelotas Basin. The simple binary model shows that parent compositions of Campos and Pelotas cannot result from the mixture of T C (Tristao da Cunha) and SCLM (Sub continental Lithospheric Mantle). The best results obtained suggest the participation of component N-Morb in the generation of basalt suites of the Campos and Pelotas basins (respectively 61% and 93% of partial melting). Tristao da Cunha seems to have been an important component to the generation of the basalt suite of the Campos Basin (at 39% of partial melting). In Pelotas, the model indicates restricted contribution of SCLM reservoirs. (author)
Support vector machine in machine condition monitoring and fault diagnosis

Science.gov (United States)

Widodo, Achmad; Yang, Bo-Suk

2007-08-01

Recently, the issue of machine condition monitoring and fault diagnosis as a part of maintenance system became global due to the potential advantages to be gained from reduced maintenance costs, improved productivity and increased machine availability. This paper presents a survey of machine condition monitoring and fault diagnosis using support vector machine (SVM). It attempts to summarize and review the recent research and developments of SVM in machine condition monitoring and diagnosis. Numerous methods have been developed based on intelligent systems such as artificial neural network, fuzzy expert system, condition-based reasoning, random forest, etc. However, the use of SVM for machine condition monitoring and fault diagnosis is still rare. SVM has excellent performance in generalization so it can produce high accuracy in classification for machine condition monitoring and diagnosis. Until 2006, the use of SVM in machine condition monitoring and fault diagnosis is tending to develop towards expertise orientation and problem-oriented domain. Finally, the ability to continually change and obtain a novel idea for machine condition monitoring and fault diagnosis using SVM will be future works.
Conceitos sobre o modelo de campos e armas da competição

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Jose Celso Contador

2008-01-01

Full Text Available http://dx.doi.org/10.5007/2175-8069.2008v10n21p147 O modelo de Campos e Armas da Competição (CAC vem sendo publicado como referencial teórico de muitos estudos, porém, de forma fragmentada. Devido ao grau de consolidação que atingiu, é o momento de publicá-lo na íntegra, a fim de lançá-lo à discussão na comunidade científica da área de Estratégia. É um modelo da Teoria da Competitividade validado cientificamente, que, por ser qualitativo e quantitativo, tem vantagens em relação ao modelo de Porter, RBV e Balanced Scorecard. Ele nasceu de uma idéia simples: separar, de acordo com o interesse do cliente, as chamadas vantagens competitivas, distinguindo as que lhe interessam das que não lhe interessam. As primeiras referem-se aos campos da competição, e, as segundas, às armas da competição. Os campos da competição estão relacionados à estratégia competitiva de negócio, e as armas da competição às estratégias competitivas operacionais. Este é o primeiro artigo de uma série de três.
Acuidade visual e eletrorretinografia de campo total em pacientes com síndrome de Usher

OpenAIRE

Mendieta,Luana; Berezovsky,Adriana; Salomão,Solange Rios; Sacai,Paula Yuri; Pereira,Josenilson Martins; Fantini,Sérgio Costa

2005-01-01

A síndrome de Usher (SU) é doença autossômica recessiva caracterizada por perda auditiva neuro-sensorial acompanhada de retinose pigmentária (RP). OBJETIVO: Analisar a eletrorretinografia de campo total (ERG) e a acuidade visual (AV) em pacientes com síndrome de Usher tipos I e II. MÉTODOS: Foram estudadas as respostas da eletrorretinografia de campo total e a acuidade visual de 22 pacientes (idade média = 26,8±16,8 anos). Destes, 17 tinham síndrome de Usher tipo I e 5 tinham síndrome ...
La definición del campo estatal y su relación con la guerra civil: un horizonte teórico

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Manuel Alberto Alonso Espinal

2014-01-01

Full Text Available El artículo presenta algunos elementos teóricos que pueden resultar útiles para estudiar los procesos de formación del campo estatal y el papel de las guerras civiles en dichos procesos. En el texto se destacan cuatro asuntos: 1 la imposibilidad de estudiar el Estado bajo el presupuesto de la separación entre este y la sociedad; 2 la importancia de examinar el proceso de formación del campo estatal a partir de una perspectiva histórica y cultural que incluya, entre otras cosas, la reflexión sobre las luchas, silencios, acuerdos, consensos y resistencias de los diferentes actores que intervienen en ese campo; 3 el valor de abordar el campo estatal en la esfera local y regional; y 4 sus múltiples tensiones, conflictos y violencias.
La definición del campo estatal y su relación con la guerra civil: un horizonte teórico

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Manuel Alberto Alonso Espinal

2014-12-01

Full Text Available El artículo presenta algunos elementos teóricos que pueden resultar útiles para estudiar los procesos de formación del campo estatal y el papel de las guerras civiles en dichos procesos. En el texto se destacan cuatro asuntos: 1 la imposibilidad de estudiar el Estado bajo el presupuesto de la separación entre este y la sociedad; 2 la importancia de examinar el proceso de formación del campo estatal a partir de una perspectiva histórica y cultural que incluya, entre otras cosas, la reflexión sobre las luchas, silencios, acuerdos, consensos y resistencias de los diferentes actores que intervienen en ese campo; 3 el valor de abordar el campo estatal en la esfera local y regional; y 4 sus múltiples tensiones, conflictos y violencias.
Simulations of Quantum Turing Machines by Quantum Multi-Stack Machines

OpenAIRE

Qiu, Daowen

2005-01-01

As was well known, in classical computation, Turing machines, circuits, multi-stack machines, and multi-counter machines are equivalent, that is, they can simulate each other in polynomial time. In quantum computation, Yao [11] first proved that for any quantum Turing machines $M$, there exists quantum Boolean circuit $(n,t)$-simulating $M$, where $n$ denotes the length of input strings, and $t$ is the number of move steps before machine stopping. However, the simulations of quantum Turing ma...
Caesalpinioideae (Leguminosae nos Campos Rupestres do Parque Estadual do Itacolomi, MG, Brasil Caesalpinioideae (Leguminosae in "Campos Rupestres" of Itacolomi State Park, Minas Gerais State, Brazil

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Valquíria Ferreira Dutra

2008-06-01

Full Text Available Este trabalho consiste do estudo florístico de Caesalpinioideae dos Campos Rupestres do Parque Estadual do Itacolomi (PEI, localizado no sul da Cadeia do Espinhaço. As coletas foram mensais, no período entre setembro/2003 e outubro/2004. Foram encontradas 13 espécies de Caesalpinioideae, reunidas em três gêneros: Bauhinia, Chamaecrista e Senna. O gênero Chamaecrista foi o que mais se destacou em número de espécies. Foram elaboradas chaves para identificação das espécies, além de diagnoses, ilustrações e comentários sobre afinidades, distribuição geográfica e fenologia das mesmas.This work consists of a floristic study of the Caesalpinioideae in "Campos Rupestres" at Itacolomi State Park, southern Espinhaço Range. Collections were carried out monthly from September 2003 to October 2004. Thirteen species of Caesalpinioideae belonging to three genera were found: Bauhinia, Chamaecrista and Senna. The genus Chamaecrista had the highest number of species. Species identification keys are presented, as well as descriptions, illustrations and comments on morphological relationships, geographic distribution and phenology.
Descompresión en el campo literario latinoamericano: reflejos pop en los 60 y los 2000

OpenAIRE

Guedán Vidal, Manuel

2013-01-01

La ruptura desde el campo literario Puede discutirse su denominación, su naturaleza intrínsecamente literaria o mercadotécnica e incluso su existencia real como grupo, pero resulta innegable que, desde principios de los años 60 y durante varias décadas, los autores del llamado boom dominaron el campo literario latinoamericano. Cortázar, Vargas Llosa, García Márquez, Fuentes y, en menor medida, Donoso, lograban cifras de ventas hasta entonces insólitas en el continente y absorbían casi toda la...
A grande fuga: como um campo sobreviveu a tempos difíceis

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Leon Fink

2012-12-01

Full Text Available O artigo apresenta um balanço da historiografia norte-americana sobre trabalhadores. Após detectar momentos de crise dentro desse campo de pesquisa, aponta os caminhos de recuperação e vitalidade, com novas temáticas e abordagens.
Plant Biodiversity Drivers in Brazilian Campos Rupestres: Insights from Phylogenetic Structure.

Science.gov (United States)

Zappi, Daniela C; Moro, Marcelo F; Meagher, Thomas R; Nic Lughadha, Eimear

2017-01-01

Old, climate-buffered infertile landscapes (Ocbils) have attracted increasing levels of interest in recent years because of their exceptionally diverse plant communities. Brazil's campos rupestres (rupestrian grasslands) are home to almost 15% of Brazil's native flora in less than 0.8% of Brazil's territory: an ideal study system for exploring variation in floristic diversity and phylogenetic structure in sites differing in geology and phytophysiognomy. We found significant differences in floristic diversity and phylogenetic structure across a range of study sites encompassing open vegetation and forest on quartzite (FQ) and on ironstone substrates, commonly termed canga . Substrate and physiognomy were key in structuring floristic diversity in the Espinhaço and physiognomy was more important than substrate in structuring phylogenetic diversity, with neither substrate nor its interaction with physiognomy accounting for significant variation in phylogenetic structure. Phylogenetic clustering was significant in open vegetation on both canga and quartzite, reflecting the potential role of environmental filtering in these exposed montane communities adapted to multiple environmental stressors. In forest communities, phylogenetic clustering was significant only at relatively deep nodes of the phylogeny in FQ while no significant phylogenetic clustering was detected across forest on canga (FC), which may be attributable to proximity to the megadiverse Atlantic forest biome and/or comparatively benign environmental conditions in FC with relatively deep, nutrient-rich soils and access to edaphic water reliable in comparison to those for open vegetation on canga and open or forest communities on quartzite. Clades representing relatively old lineages are significantly over-represented in campos rupestres on quartzite, consistent with the Gondwanan Heritage Hypothesis of Ocbil theory. In contrast, forested sites on canga are recognized as Yodfels. To be effective
Plant Biodiversity Drivers in Brazilian Campos Rupestres: Insights from Phylogenetic Structure

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Daniela C. Zappi

2017-12-01

Full Text Available Old, climate-buffered infertile landscapes (Ocbils have attracted increasing levels of interest in recent years because of their exceptionally diverse plant communities. Brazil’s campos rupestres (rupestrian grasslands are home to almost 15% of Brazil’s native flora in less than 0.8% of Brazil’s territory: an ideal study system for exploring variation in floristic diversity and phylogenetic structure in sites differing in geology and phytophysiognomy. We found significant differences in floristic diversity and phylogenetic structure across a range of study sites encompassing open vegetation and forest on quartzite (FQ and on ironstone substrates, commonly termed canga. Substrate and physiognomy were key in structuring floristic diversity in the Espinhaço and physiognomy was more important than substrate in structuring phylogenetic diversity, with neither substrate nor its interaction with physiognomy accounting for significant variation in phylogenetic structure. Phylogenetic clustering was significant in open vegetation on both canga and quartzite, reflecting the potential role of environmental filtering in these exposed montane communities adapted to multiple environmental stressors. In forest communities, phylogenetic clustering was significant only at relatively deep nodes of the phylogeny in FQ while no significant phylogenetic clustering was detected across forest on canga (FC, which may be attributable to proximity to the megadiverse Atlantic forest biome and/or comparatively benign environmental conditions in FC with relatively deep, nutrient-rich soils and access to edaphic water reliable in comparison to those for open vegetation on canga and open or forest communities on quartzite. Clades representing relatively old lineages are significantly over-represented in campos rupestres on quartzite, consistent with the Gondwanan Heritage Hypothesis of Ocbil theory. In contrast, forested sites on canga are recognized as Yodfels. To be
El teatro de Jesús Campos o el falso dilema entre tradición y vanguardia

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Muñoz Cáliz, Berta

2015-12-01

Full Text Available In the framework of the artistic postmodernism, and with reference to the movement of the trans-avant-garde in Italy, whose ideology we find clear similarities, the theatre of Jesús Campos, located by critics within the movement called «Nuevo Teatro Español», due to their expressive boldness and its commitment to anti-Franco, however differs from most of the authors. Thus, unlike these playwrights, Campos does not reject frontally the realism of 50 and 60, or the tradition of comedy and the sainete frequented by conservative authors of the time. On the contrary, since its inception in the early 1970s, Campos uses both forms as expressive resources, from the conviction that the avant-gardes are just one more link in tradition. The analysis of these aspects calls into question the periodization that is being commonly used in the most recent Spanish theatre historiography.En el marco de la posmodernidad artística, y tomando como referencia el movimiento de la transvanguardia en Italia, con cuyos presupuestos encontramos claras similitudes, el teatro de Jesús Campos, situado por la crítica dentro del movimiento llamado «Nuevo Teatro Español», debido a su audacia expresiva y a su compromiso antifranquista, se distingue no obstante de la mayoría de los autores de este grupo en que, lejos de rechazar frontalmente el realismo de los años 50 y 60, ni la tradición de la comedia y el sainete frecuentadas por los autores conservadores del momento, Campos, ya desde sus inicios a comienzos de los 70, emplea unas y otras formas como recursos expresivos, desde el convencimiento de que las vanguardias no son sino un eslabón más de la tradición. El análisis de estos aspectos pone en cuestión la periodización que viene usando de forma habitual la historiografía del teatro español más reciente.

Machine tool structures

CERN Document Server

Koenigsberger, F

1970-01-01

Machine Tool Structures, Volume 1 deals with fundamental theories and calculation methods for machine tool structures. Experimental investigations into stiffness are discussed, along with the application of the results to the design of machine tool structures. Topics covered range from static and dynamic stiffness to chatter in metal cutting, stability in machine tools, and deformations of machine tool structures. This volume is divided into three sections and opens with a discussion on stiffness specifications and the effect of stiffness on the behavior of the machine under forced vibration c
Maratonas hackers no Brasil com desafios no campo da Saúde

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Francini Lube Guizardi

Full Text Available O objetivo deste estudo foi mapear a realização de maratonas hackers no Brasil, com desafios voltados para o campo da Saúde. Espera-se que a descrição e sistematização dos aspectos metodológicos dos eventos identificados, cotejados com informações advindas de levantamento bibliográfico, auxiliem na divulgação e aplicação da metodologia na saúde. De caráter exploratório e descritivo, o mapeamento foi realizado por meio de uma pesquisa web, com o buscador Google, e na base de dados Biblioteca Virtual da Saúde (BVS, abrangendo o período entre 2000 e 2016. Identificou-se a realização de 16 hackathons que abordaram desafios ou soluções na Saúde, sendo todos realizados a partir de 2012. Os resultados encontrados ressaltam o potencial da metodologia como fomento à criatividade e à inovação, a partir do trabalho colaborativo em equipe multiprofissional para soluções oportunas no campo da Saúde.
Electricity of machine tool

International Nuclear Information System (INIS)

Gijeon media editorial department

1977-10-01

This book is divided into three parts. The first part deals with electricity machine, which can taints from generator to motor, motor a power source of machine tool, electricity machine for machine tool such as switch in main circuit, automatic machine, a knife switch and pushing button, snap switch, protection device, timer, solenoid, and rectifier. The second part handles wiring diagram. This concludes basic electricity circuit of machine tool, electricity wiring diagram in your machine like milling machine, planer and grinding machine. The third part introduces fault diagnosis of machine, which gives the practical solution according to fault diagnosis and the diagnostic method with voltage and resistance measurement by tester.
RENDIMIENTO DE 12 HÍBRIDOS COMERCIALES DE ZANAHORIA (Daucus carota L. EN EL CAMPO Y EN LA PLANTA DE EMPAQUE

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Fernando Richmond-Zumbado

2010-01-01

Full Text Available Se evaluaron 12 híbridos comerciales de zanahoria (Daucus carota L. en Cot de Oreamuno, Cartago, Costa Rica, con el objetivo de evaluar el rendimiento en el campo y la planta de empaque, de junio a octubre del 2007. Los híbridos evaluados fueron: Bangor F1, Big Sur, Bolero F1, Concerto F1 (VAC 03 F1, XCR3688, Esperanza, Nandrin F1, Napoli F1, S-505, Spearhead, Trinity y Sirkana. Se obtuvo el número y peso de las raíces de los híbridos comerciales clasificadas en raíces totales, comerciales y diferentes variables de rechazo; en el campo y en la planta de empaque. Los híbridos con el mayor rendimiento comercial en campo y en planta empacadora, en orden decreciente, fueron: Bangor F1, Esperanza, Concerto F1, Nandrin F1 y Sirkana. Los materiales con menor rechazo en campo fueron Nandrin F1, Sirkana y Bangor F1, y en planta empacadora fueron: Big Sur, Sirkana, Napoli F1, Bolero F1 y XCR3688. Las principales causas de rechazo de la zanahoria en el campo y en la planta empacadora fueron: raíces bifurcadas, con rajadura, raíz pequeña y tamaño jumbo.
Machine medical ethics

CERN Document Server

Pontier, Matthijs

2015-01-01

The essays in this book, written by researchers from both humanities and sciences, describe various theoretical and experimental approaches to adding medical ethics to a machine in medical settings. Medical machines are in close proximity with human beings, and getting closer: with patients who are in vulnerable states of health, who have disabilities of various kinds, with the very young or very old, and with medical professionals. In such contexts, machines are undertaking important medical tasks that require emotional sensitivity, knowledge of medical codes, human dignity, and privacy. As machine technology advances, ethical concerns become more urgent: should medical machines be programmed to follow a code of medical ethics? What theory or theories should constrain medical machine conduct? What design features are required? Should machines share responsibility with humans for the ethical consequences of medical actions? How ought clinical relationships involving machines to be modeled? Is a capacity for e...
Universal Instability in a Thermal Plasma Device (Q-Machine); Instabilite Universelle dans une Machine a Plasma Thermique (Machine-Q); Issledovaniya universal'noj neustojchivosti v ustrojstve dlya termicheski ionizovannoj plazmy; Inestabilidad Universal en un Dispositivo de Plasma Termico (Maquina Q)

Energy Technology Data Exchange (ETDEWEB)

Lashinsky, H. [University Of Maryland, College Park, MD (United States)

1966-04-15

'egard duchamp magnetique et la dependance spatiale de l'amplitude de mode sont qualitativement en bon accord avec la theorie lineaire de l'instabilite universelle. L'auteur a egalement procede a des experiences sur l'effet de la longueur de la colonne sur la partie reelle de la frequence (une correction d'environ 10%) ainsi que sur sa partie imaginaire. L'effet sur cette derniere partie est du a l'amortissement de Landau des ions et cette methode fournit un excellent moyen d'etudier le mecanisme {center_dot} meme de l'amortissement de Landau. Les resultats de ces experiences sont aussi en bon accord avec la theorie lineaire et ils ont, en outre, revele plusieurs effets non lineaires tels que le < saut de mode> et la . L'auteur a analyse ces phenomenes non lineaires en etendant l'application des methodes courantes de la mecanique non lineaire a des systemes discontinus et il a trouve une relation entre eux et des phenomenes similaires observes dans des masers optiques et dans des dispositifs a tube et parametres globaux. (author) [Spanish] La columna totalmente ionizada en un dispositivo de plasma termico (maquina Q) constituye un medio conveniente para estudiar la inestabilidad universal (onda de deriva) producida por el efecto combinado del radio de Larmor finito de los iones, y del gradiente de densidad-perpendicular al campo magnetico de confinamiento. Es posible modificar los parametros adimensionales adecuados en un intervalo de valores tal que los resultados puedan graduarse a fin de permitir comparaciones con plasmas que presentan interes termonuclear; la inestabilidad puede provocarse de manera controlada regulando adecuadamente las condiciones de la capa lfmite en las placas metalicas terminales mediante tecnicas de control que se analizan conjuntamente con la teoria en que se basan. Recurriendo a estas tecnicas, es posible mantener la amplitud de las oscilaciones en valores arbitrariamente bajos y seguir el comportamiento de la inestabilidad desde
Humanizing machines: Anthropomorphization of slot machines increases gambling.

Science.gov (United States)

Riva, Paolo; Sacchi, Simona; Brambilla, Marco

2015-12-01

Do people gamble more on slot machines if they think that they are playing against humanlike minds rather than mathematical algorithms? Research has shown that people have a strong cognitive tendency to imbue humanlike mental states to nonhuman entities (i.e., anthropomorphism). The present research tested whether anthropomorphizing slot machines would increase gambling. Four studies manipulated slot machine anthropomorphization and found that exposing people to an anthropomorphized description of a slot machine increased gambling behavior and reduced gambling outcomes. Such findings emerged using tasks that focused on gambling behavior (Studies 1 to 3) as well as in experimental paradigms that included gambling outcomes (Studies 2 to 4). We found that gambling outcomes decrease because participants primed with the anthropomorphic slot machine gambled more (Study 4). Furthermore, we found that high-arousal positive emotions (e.g., feeling excited) played a role in the effect of anthropomorphism on gambling behavior (Studies 3 and 4). Our research indicates that the psychological process of gambling-machine anthropomorphism can be advantageous for the gaming industry; however, this may come at great expense for gamblers' (and their families') economic resources and psychological well-being. (c) 2015 APA, all rights reserved).
LINEAMIENTOS PARA LA CONSTRUCCION DEL CAMPO CONTABLE:UN ENFOQUE SOCIAL - HISTORICO

OpenAIRE

SUAREZ PINEDA, JESUS ALBERTO

2010-01-01

Se propone una definicion del campo contable,es pertinente en dos sentidos:en el sentido de la exposicion de las relaciones Social-Historica que subyacen a sus representaciones y dinamicas actuales de uso,y en cuanto horizonte y guia para la construcion del curriculo y la generacion de lineas y de grupos de investigacion en la universidad.
A importância do materialismo histórico na formação do educador do campo

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Luiz Bezerra Neto

2012-08-01

Full Text Available Apontamos neste texto a importância do domínio do método e dos pressupostos teóricos domaterialismo histórico para fundamentar o estudo sobre a educação do campo. Tomamoscomo referência a nossa atuação nos cursos de formação de educadores para este segmentoespecífico, tanto através dos cursos de pedagogia da terra, quanto da formação deprofessores para atuarem nas classes multisseriadas do campo.Apresentamos, em linhas gerais, os elementos constitutivos do materialismo histórico edialético, para em seguida apontarmos a importância e a atualidade desta perspectivateórico-metodológica, especialmente nas pesquisas em Educação de um modo geral e,particularmente para os estudos sobre educação do campo. Isso nos leva a uma tomada deposição diante da corrente hegemônica na pesquisa em educação e em especial naeducação do campo, que tem arrebatado muitos pesquisadores que se deixam levar pelosventos da pós-modernidade, e embebidos pelas suas idéias, julgam ultrapassados todos osreferenciais baseados no paradigma iluminista racionalista instaurado com o advento damodernidade.
Teaching arithmetic at the primary school in the nineteenth century: the memories of Humberto de Campos

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Maria Laura Magalhães Gomes

2017-09-01

Full Text Available This article focuses on the narrative of Humberto de Campos in his first volume of memoirs (1886-1900 with regard to the education of the author. The first section emphasizes the importance of autobiographical writing for research in History of Education, and especially in History of Mathematics Education. The second section is a brief presentation of Humberto de Campos as a Brazilian writer. The next part discusses the theoretical and methodological foundations adopted for the use of autobiographical sources in research. The core of the text consists of the approach of the main school experiences narrated by Humberto de Campos in Parnaíba, in the interior of the state of Piauí, in the 1890s, highlighting practices that involve mathematical knowledge. The writer’s school memories emphasize the material precariousness of elementary education, the simultaneous teaching of many students of different levels in schools managed by a single teacher and the teaching methods based on repetition and memorization and supported in practices of punishment and humiliation of students.
Studies on magnetocaloric and magnetic coupling effects =

Science.gov (United States)

Amaral, Joao Cunha de Sequeira

O presente trabalho apresenta novas metodologias desenvolvidas para a analise das propriedades magneticas e magnetocaloricas de materiais, sustentadas em consideracoes teoricas a partir de modelos, nomeadamente a teoria de transicoes de fase de Landau, o modelo de campo medio molecular e a teoria de fenomeno critico. Sao propostos novos metodos de escala, permitindo a interpretacao de dados de magnetizacao de materiais numa perspectiva de campo medio molecular ou teoria de fenomeno critico. E apresentado um metodo de estimar a magnetizacao espontanea de um material ferromagnetico a partir de relacoes entropia/magnetizacao estabelecidas pelo modelo de campo medio molecular. A termodinamica das transicoes de fase magneticas de primeira ordem e estudada usando a teoria de Landau e de campo medio molecular (modelo de Bean-Rodbell), avaliando os efeitos de fenomenos fora de equilibrio e de condicoes de mistura de fase em estimativas do efeito magnetocalorico a partir de medidas magneticas. Efeitos de desordem, interpretados como uma distribuicao na interaccao magnetica entre ioes, estabelecem os efeitos de distribuicoes quimicas/estruturais nas propriedades magneticas e magnetocaloricas de materiais com transicoes de fase de segunda e de primeira ordem. O uso das metodologias apresentadas na interpretacao das propriedades magneticas de variados materiais ferromagneticos permitiu obter: 1) uma analise quantitativa da variacao de spin por iao Gadolinio devido a transicao estrutural do composto Gd5Si2Ge2, 2) a descricao da configuracao de cluster magnetico de ioes Mn na fase ferromagnetica em manganites da familia La-Sr e La-Ca, 3) a determinacao dos expoentes criticos β e δ do Niquel por metodos de escala, 4) a descricao do efeito da pressao nas propriedades magneticas e magnetocaloricas do composto LaFe11.5Si1.5 atraves do modelo de Bean-Rodbell, 5) uma estimativa da desordem em manganites ferromagneticas com transicoes de segunda e primeira ordem, 6) uma descricao de
Da deflexão de raios cósmicos ultra-energéticos no campo magnético galáctico

OpenAIRE

Rafael Alves Batista

2012-01-01

Resumo: Campos magnéticos cósmicos são ubíquos e estão presentes em todas as escalas, desde os planetas até os superaglomerados de galáxias. Sabe-se que o campo magnético da Via Láctea possui uma componente regular, que tem uma estrutura espiral, e uma componente aleatória. Muitas questões acerca do magnetismo galáctico ainda permanecem sem respostas, e o modelo de espiral mais adequado para descrever as observações é incógnito. Uma possibilidade pouco explorada para estudar o campo magnético...
Composition, phenology and restoration of campo rupestre mountain grasslands - Brazil

OpenAIRE

Le Stradic, Soizig

2012-01-01

Global environmental changes, especially land-use changes, have profound effects on both ecosystem functioning and biodiversity, having already altered many ecosystem services. These losses emphasize the need to preserve what remains; however when conservation programs are not sufficient, restoring areas that have been destroyed or disturbed can improve conservation efforts and mitigate damages. This work focuses on campos rupestres, Neotropical grasslands found at altitudes, which are part o...
Protein fraction and digestibility of marandu, xaraes and campo grande grasses in monocropping and intercropping systems under different sowing methods - doi: 10.4025/actascianimsci.v35i1.15134

Directory of Open Access Journals (Sweden)

Welma Santos Crunivel

2013-01-01

Full Text Available A study was carried out to evaluate the protein fraction and in vitro dry matter digestibility of marandu, xaraes grasses and campo grande in monocropping and intercropping systems under different planting methods, for a period of two years. The experimental design was a complete randomized block with four replications. The treatments consisted of the following crop systems: campo grande in monocropping; xaraés grass in monocropping; marandu grass in monocropping; xaraés intercropped with campo grande in rows; xaraés intercropped with campo grande, broadcast; marandu grass intercropped with campo grande in rows; and marandu intercropped with campo grand, broadcast. The evaluations were conducted for two years, consisting of seasonal evaluations (autumn, winter, spring and summer in the same plots, with repeated measurements over time. The results showed that xaraes and marandu grasses were similar between crop systems, indicating that both can be intercropped with campo grande. The intercropping of campo grande with Brachiaria brizantha cultivars improved the protein fraction and digestibility. The row method of planting provided better protein fractions and in vitro dry matter digestibility.
Los campos fantasmas en la renormalización de un modelo Lagrangiano t-J

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Oscar P. Zandron

2011-01-01

Full Text Available En presente trabajo hemos tratado el rol de los campos fantasmas en el proceso de renormalización del formalismo Lagrangiano perturbativo para un modelo t-J. Mostramos que con la incorporación de campos fantasmas apropiados en los propagadores y vértices de la teoría, la misma puede ser renormalizada a todo orden. Esto se pone en evidencia en el estudio detallado de la renormalización del propagador ferromagnético del magnón, mostrando el ablandamiento térmico de la frecuencia. También hemos analizado el caso antiferromagnético, y estos resultados fueron confrontados con estudios previos en teorías del "spin-polarón".
Desagrarización del campo chiapaneco

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Julieta Martínez Cuero

2011-06-01

Full Text Available En este trabajo se analizan las transformaciones del campo chiapaneco a nivel regional. El propósito es evaluar las tesis de una nueva ruralidad y heterogeneidad estructural en el sector rural del estado. Para ello, en primer lugar se describen las condiciones estructurales del sector agrario en la entidad, partiendo de: las condiciones ecológicas y geográficas, el tipo de tenencia de la tierra y la composición poblacional dedicada a la producción agrícola. En segundo lugar, se recogen elementos clave que explican el proceso de desagrarización en cada una de las regiones de análisis, considerando el impacto de las políticas de apertura económica sobre el sector y el agotamiento de la frontera agrícola.
Code-expanded radio access protocol for machine-to-machine communications

DEFF Research Database (Denmark)

Thomsen, Henning; Kiilerich Pratas, Nuno; Stefanovic, Cedomir

2013-01-01

The random access methods used for support of machine-to-machine, also referred to as Machine-Type Communications, in current cellular standards are derivatives of traditional framed slotted ALOHA and therefore do not support high user loads efficiently. We propose an approach that is motivated b...... subframes and orthogonal preambles, the amount of available contention resources is drastically increased, enabling the massive support of Machine-Type Communication users that is beyond the reach of current systems.......The random access methods used for support of machine-to-machine, also referred to as Machine-Type Communications, in current cellular standards are derivatives of traditional framed slotted ALOHA and therefore do not support high user loads efficiently. We propose an approach that is motivated...... by the random access method employed in LTE, which significantly increases the amount of contention resources without increasing the system resources, such as contention subframes and preambles. This is accomplished by a logical, rather than physical, extension of the access method in which the available system...
Caracterización de los niveles de exposición a campos electromagnéticos durante el tratamiento con diatermia

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Douglas Deás Yero

2013-06-01

Full Text Available Se realizó un estudio del campo electromagnético generado por distintos electrodos de tipo capacitivo, empleados en el equipo de fisioterapia por diatermia de onda corta YB4-66, considerando su interacción con el medio ambiente que le rodea. Se realizaron las mediciones de campo eléctrico para diferentes configuraciones de tratamiento y se utilizó un medidor de campo eléctrico de sonda isotrópica. Se diseñó, mediante un software profesional de simulación, un modelo electromagnético paramétrico bidimensional con simetría axial, para obtener detalladamente en cada configuración de los electrodos evaluados la interacción del campo electromagnético con el tejido biológico y el ambiente exterior. Se halló una buena correspondencia entre los resultados obtenidos de forma experimental y las simulaciones, lo cual permitió identificar los niveles de exposición y tomar decisiones para lograr un tratamiento más efectivo y con el menor daño posible a los seres humanos.
Francisco Giner de los Ríos en el campo.

OpenAIRE

Anónimo (siglo XX)

2010-01-01

1 fot.; papel. - Hombre mayor sentado en campo.Francisco Giner de los Rios, filósofo, ensayista y pedagogo. Fundador y director de la Institución Libre de Enseñanza. (Emulsión de plata de ennegrecimiento directo montada sobre cartulina del mismo tamaño. Imagen muy arrugada y dañada en márgenes. Pequeña pérdida de materia en centro de lateral derecho. Imagen amarillenta y desvanecida). - Procedencia: fondo Miguel de Unamuno. - Buena Conservación.
Simple machines

CERN Document Server

Graybill, George

2007-01-01

Just how simple are simple machines? With our ready-to-use resource, they are simple to teach and easy to learn! Chocked full of information and activities, we begin with a look at force, motion and work, and examples of simple machines in daily life are given. With this background, we move on to different kinds of simple machines including: Levers, Inclined Planes, Wedges, Screws, Pulleys, and Wheels and Axles. An exploration of some compound machines follows, such as the can opener. Our resource is a real time-saver as all the reading passages, student activities are provided. Presented in s

Machine performance assessment and enhancement for a hexapod machine

Energy Technology Data Exchange (ETDEWEB)

Mou, J.I. [Arizona State Univ., Tempe, AZ (United States); King, C. [Sandia National Labs., Livermore, CA (United States). Integrated Manufacturing Systems Center

1998-03-19

The focus of this study is to develop a sensor fused process modeling and control methodology to model, assess, and then enhance the performance of a hexapod machine for precision product realization. Deterministic modeling technique was used to derive models for machine performance assessment and enhancement. Sensor fusion methodology was adopted to identify the parameters of the derived models. Empirical models and computational algorithms were also derived and implemented to model, assess, and then enhance the machine performance. The developed sensor fusion algorithms can be implemented on a PC-based open architecture controller to receive information from various sensors, assess the status of the process, determine the proper action, and deliver the command to actuators for task execution. This will enhance a hexapod machine`s capability to produce workpieces within the imposed dimensional tolerances.
Superconducting rotating machines

International Nuclear Information System (INIS)

Smith, J.L. Jr.; Kirtley, J.L. Jr.; Thullen, P.

1975-01-01

The opportunities and limitations of the applications of superconductors in rotating electric machines are given. The relevant properties of superconductors and the fundamental requirements for rotating electric machines are discussed. The current state-of-the-art of superconducting machines is reviewed. Key problems, future developments and the long range potential of superconducting machines are assessed
El proceso de selección natural en el campo social del ballet en Cuba

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Hamlet Betancourt León

2010-09-01

Full Text Available El campo del ballet es un sistema social conflictivo donde se manifiesta gran competitividad -reflejada en continuas selecciones sociales y naturales- para cumplimentar la fantasía de todos los bailarines: bailar públicamente. El objetivo de esta investigación es demostrar la pertinencia del supuesto teórico darwinista de selección natural en la discriminación de belleza escénica de la figura del bailarín en el sistema piramidal de selección, formación y desempeño profesional del campo cubano del ballet. El campo del ballet se registra fácticamente en instituciones culturales pobladas por individuos que persiguen cotidianamente crear bailarines profesionales aptos -primera condición es ser revolucionario- que representen internacionalmente a la Revolución Cubana. El campo se estructura en un sistema piramidal de selección, formación y desempeño de bailarines profesionales que rige sus prácticas principales de exclusión/inclusión -puntos de corte- por el principio darwinista de selección natural. Los exámenes de capacidades físicas de ingreso y pase de nivel a la enseñanza de nivel medio y la aceptación a la compañía profesional Ballet Nacional de Cuba conforman los puntos de corte del sistema piramidal. Estos contienen prácticas sociales que valoran -empírica, pero sistemáticamente- las características morfo-funcionales de los participantes interesados respecto al deber ser del canon artístico de figura, para seleccionar siempre a los más bellos, los más aptos, bailarines de ballet.
Trap-Nesting Bees in Montane Grassland (Campo Rupestre) and Cerrado in Brazil: Collecting Generalist or Specialist Nesters.

Science.gov (United States)

Araújo, P C S; Lourenço, A P; Raw, A

2016-10-01

Species richness and seasonal abundance of solitary bees were investigated in rocky, montane grassland (campo rupestre) (1180 m asl) and cerrado sensu stricto (680 m asl) in the Biribiri State Park, Diamantina, state of Minas Gerais, Brazil. Three hundred nineteen nest traps of bamboo canes and black cardboard tubes were monthly inspected at each site during 15 months. A total of eight species of bees built 97 nests. Four species were common to both sites. Tetrapedia aff. curvitarsis Friese and Tetrapedia aff. peckoltii Friese were the most abundant at campo rupestre and cerrado s.s., respectively, followed by Centris analis (Fabricius) in campo rupestre and Centris tarsata Smith in cerrado s.s. The nesting peaks occurred in May in campo rupestre and in February in cerrado s.s. Three cuckoo bees and one bee-fly were collected as natural enemies. The findings suggest that differences between the sites were related more to ecological factors (floral resources, natural nest sites) than to the altitudinal difference. The species richness was similar to that in other habitats with open vegetation. We demonstrate the need to use several types of trap-nest to increase the range of species sampled; some species used only one of the two types traps provided. We also comment on the limitations of trap-nests in cerrado vegetation. Most cerrado species of bees are very selective in their choice for a nesting site, but bees that use trap-nests are more generalists.
Estudio del Efecto de Campos Magnéticos en Citoesqueleto de Osteoblastos Humanos Estudio del Efecto de Campos Magnéticos en Citoesqueleto de Osteoblastos Humanos

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Modesto Sosa Aquino

2012-02-01

Full Text Available En este trabajo se presentan los resultados obtenidos de la aplicación de Campos Magnéticos (CM tanto pulsados (CMP como estáticos (CME en la morfología de osteoblastos humanos. El efecto de dichos campos ha sido medido por medio del análisis de la estructura de la β-tubulina, la cual es una proteína que forma parte del citoesqueleto celular. El campo magnético aplicado fue de 0.65 mT en el caso del CMP y de 0.5 mT en el caso del CME. La aplicación de los CM provoca alteración en el patrón de distribución normal de las redes de microtúbulos, dando lugar a la formación de agregados fluorescentes en la región cortical de la membrana celular. Las observaciones obtenidas con respecto a loscambios morfológicos de los osteoblastos, indican claramente que éstos son sensibles a la estimulación con CM, alterando su actividad celular a través de cambios en la estructuradel citoesqueleto celular.In this work are presented the results obtained from the application of magnetic fields (MF, both pulsed (PMF and static (SMF, on the morphology of human osteoblasts. The effectof such fields has been evaluated through the analysis of the structure of the β-tubuline, which is protein that forms part of the cellular cytoskeleton. The applied fields were 0.65 m Tand 0.5 mT for PMF and SMF, respectively. The application of the MF produces alterations in the pattern of normal distribution of microtubules, which gives rise to the formation of fluorescent aggregates in the cortical region of the cellular membrane. The obtained results with respect to the morphological changes in the osteoblasts clearly suggest that these are sensitive to stimulation with MFs, which alter its cellular activity through changes in cytoskeletal structures.
Sustainable machining

CERN Document Server

2017-01-01

This book provides an overview on current sustainable machining. Its chapters cover the concept in economic, social and environmental dimensions. It provides the reader with proper ways to handle several pollutants produced during the machining process. The book is useful on both undergraduate and postgraduate levels and it is of interest to all those working with manufacturing and machining technology.
Respuesta de geófonos a campos electromagnéticos

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Patricia M Gauzellino

2010-12-01

Full Text Available La electro-ósmosis es el fenómeno físico por el cual una variación de potencial eléctrico, da lugar a una circulación de fluido. El fenómeno recíproco que genera una corriente eléctrica a partir de un gradiente de presión en el fluido, recibe el nombre de electro-filtración. La razón entre las variaciones de potencial y las variaciones de presión representa al coeficiente de acoplamiento electrocinético. Recién en 1999, se realizó una prueba de campo con propósitos exploratorios, donde las ondas sísmicas se generaron a partir de una fuente electromagnética. En el presente trabajo se explica el por qué de estos efectos electrosísmicos o sismoeléctricos, según sea la fuente de origen electromagnético o mecánico, respectivamente. Se presentan las ecuaciones de Maxwell y de Biot acopladas que gobiernan los fenómenos y se analizan los coeficientes de transporte que son la conductividad eléctrica, el coeficiente de acoplamiento electrocinético y la permeabilidad. Es posible hacer ciertas suposiciones que permiten resolver un conjunto de ecuaciones simplificadas donde las respuestas electromagnéticas y las respuestas poroviscoélasticas pueden determinarse unas de otras en forma independiente. En el tratamiento de las ecuaciones de Maxwell se sigue la forma usual de descomponer el campo eléctrico y el campo magnético en campos primarios (o principales que se hallan analíticamente y campos secundarios, como perturbaciones de los primarios, que se calculan numéricamente. Trabajar en el dominio espacio-frecuencia, permite incorporar la naturaleza disipativa del medio poroso en la propagación de las ondas mecánicas, reemplazando los módulos elásticos reales por módulos complejos. Así mismo, se destaca la necesidad de establecer una grilla de cálculo adecuada para representar correctamente los gradientes de presión en el fluido a partir del skin-depth difusivo que se corresponde con la onda lenta de Biot. Ejemplos
DIAGNOSTICO DE AFECCIONES RESPIRATORIAS EN CAMPO QUIJANO SALTA -ARGENTINA

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Marta Leonor de Viana

2008-01-01

Full Text Available Campo Quijano está a 30 Km. de la ciudad de Salta y cuenta aproximadamente con 8300 habitantes. En el éjido urbano existen dos borateras que constituyen una fuente puntual de contaminación del aire, suelo y aguas. Se estudió la prevalencia de enfermedades respiratorias en la población urbana en el año 2005. Se trabajó con los datos de las planillas de consultas diarias externas del Hospital Francisco Herrera. Se consideraron cuatro grupos de afecciones, seleccionados por la sintomatología y su posible asociación con las emisiones gaseosas de las borateras: Rinitis; Catarro en vías aéreas superiores, Espasmos y Tos irritativa. Se estimó y comparó la prevalencia de las enfermedades por barrio con la prueba de X2 y la de los residuales ajustados de Haberman. Los espasmos y catarros en vías aéreas superiores fueron las afecciones más frecuentes en la población de Campo Quijano. En rinitis no se encontraron diferencias entre barrios. El barrio San Roque presentó las mayores prevalencias en CVAs, espasmos y tos irritativa. Barrios cercanos a las borateras presentaron prevalencias dispares, lo que podría relacionarse con características socio-culturales, sanitarias y económicas, entre otros factores de riesgo, no considerados en este diagnóstico.
Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

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Ming Cheng

2015-09-01

Full Text Available The paper presents a number of advanced solutions on electric machines and machine-based systems for the powertrain of electric vehicles (EVs. Two types of systems are considered, namely the drive systems designated to the EV propulsion and the power split devices utilized in the popular series-parallel hybrid electric vehicle architecture. After reviewing the main requirements for the electric drive systems, the paper illustrates advanced electric machine topologies, including a stator permanent magnet (stator-PM motor, a hybrid-excitation motor, a flux memory motor and a redundant motor structure. Then, it illustrates advanced electric drive systems, such as the magnetic-geared in-wheel drive and the integrated starter generator (ISG. Finally, three machine-based implementations of the power split devices are expounded, built up around the dual-rotor PM machine, the dual-stator PM brushless machine and the magnetic-geared dual-rotor machine. As a conclusion, the development trends in the field of electric machines and machine-based systems for EVs are summarized.
Asynchronized synchronous machines

CERN Document Server

Botvinnik, M M

1964-01-01

Asynchronized Synchronous Machines focuses on the theoretical research on asynchronized synchronous (AS) machines, which are "hybrids of synchronous and induction machines that can operate with slip. Topics covered in this book include the initial equations; vector diagram of an AS machine; regulation in cases of deviation from the law of full compensation; parameters of the excitation system; and schematic diagram of an excitation regulator. The possible applications of AS machines and its calculations in certain cases are also discussed. This publication is beneficial for students and indiv
EL PROBLEMA DE LA CIUDADANIA: UNA APROXIMACION DESDE EL CAMPO DE LA COMUNICACION-EDUCACION

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Humberto J. Cubides C.

1998-01-01

Full Text Available Diversos autores en su análisis de la sociedad contemporánea intentan resignificar el concepto de ciudadanía para responder a la pregunta de cómo lograr en nuestras sociedades complejas idear una base común de solidaridad social, respetando el pluralismo. El autor, acogiendo el término de ciudadanía contestable, y a partir de la revisión de las teorías clásicas de ciudadanía (liberal, comunitarista y neorrepublicana respecto de los rasgos básicos que definen el concepto, realiza un abordaje novedoso y sugerente al tema desde las categorías en construcción del campo de comunicación-educación, campo que define como estratégico.
A geometria do campo magnético na região da nuvem Lupus 1

Science.gov (United States)

Alves, F. P.; Franco, G. A. P.

2003-08-01

Apresentaremos os resultados de uma investigação polarimétrica na região de formação estelar junto à nuvem escura Lupus 1. Esse estudo baseia-se em polarimétria CCD obtida na banda R, e cobre Lupus 1, bem como a área vizinha a essa nuvem contendo a cavidade em 100 mm IRAS. Os dados observacionais foram coletados com o telescópio IAG de 60 cm do Observatório do Pico dos Dias (LNA/MCT - Brasópolis - MG). Nossa primeira análise mostra que uma variação da orientação do campo magnético através da região pode produzir padrões complexos de polarização cuja geometria do campo não pode ser facilmente determinada. Os padrões de polarização são inconsistentes com um campo magnético estritamente uniforme e unidimensional em larga escala. Comparação com a emissão em 100 mm mostra que localmente os vetores de polarização exibem um forte alinhamento com a orientação dos padrões observados em infravermelho.
Machine Shop Lathes.

Science.gov (United States)

Dunn, James

This guide, the second in a series of five machine shop curriculum manuals, was designed for use in machine shop courses in Oklahoma. The purpose of the manual is to equip students with basic knowledge and skills that will enable them to enter the machine trade at the machine-operator level. The curriculum is designed so that it can be used in…
LA INOCULACIÓN CON Glomus fasciculatum EN EL CRECIMIENTO DE CUATRO ESPECIES FORESTALES EN VIVERO Y CAMPO

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William Hernández

2009-01-01

Full Text Available La presente investigación se realizó para conocer la respuesta de 4 especies forestales a la aplicación del Glomus fasciculatum en vivero y campo. En la fase de vivero se evalúo diámetro basal, altura total, peso seco del follaje y radicular, absorción de nutrimentos en el follaje y el sistema radicular. En campo se cuantificó altura total, diámetro, y absorción de nutrimentos en el follaje. Los resultados mostraron que en vivero los mayores incrementos promedio, en los tratamientos inoculados, los registró el ronrón (Astronium graveolens, la teca (Tectona grandis y el amarillón (Terminalia amazonia, con 48,9, 35,2 y 30,6%, respectivamente; mientras que en melina (Gmelina arborea el incremento fue de 16,9%. El mayor incremento se registró en el peso seco del follaje y en el radicular con 30,8 y 63%, respectivamente. En la absorción de nutrimentos el ronrón mostró diferencias en Mg, Cu, Zn, Mn y Fe, tanto en el follaje como en el sistema radicular; sin embargo, melina fue la especie que registró las concentraciones de nutrimentos superiores, aunque no significativas; las demás especies no registraron diferencias significativas. En el campo, en las plantas inoculadas, solamente melina reflejó diferencias significativas en diámetro y altura total, con un incremento de 37,9 y 31,7%, respectivamente. La absorción de nutrimentos de melina, amarillón y ronrón fue en promedio 32,2, 19,8 y 6,6%, respectivamente, con una mayor absorción en Ca, Mn, K y Fe. La mortalidad en vivero fue nula, mientras que en el campo, varió de acuerdo con la especie y el tratamiento. El aumento en el crecimiento de las 4 especies fue la tendencia común, a excepción de teca, que en el campo no mostró resultados positivos.
Estado de conhecimento e questões do campo científico

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Marilia Costa Morosini

2015-01-01

Full Text Available http://dx.doi.org/10.5902/1984644415822Este texto objetiva desvelar questões sobre a construção de Estados de Conhecimento na área da Educação e apontar posições teóricas fundamentadoras dessas questões com vista à prática de pesquisa articulada à realidade nacional. Parte de tematizações encima de experiências, ao longo de quatro anos, em um curso de pós-graduação de excelência. Identifica categorias de análise na perspectiva do campo cientifico (Bourdieu: Políticas públicas do Estado-nação e da área disciplinar; Finalidades do Estado de Conhecimento para a ruptura de pré-conceitos (Quivy e Capenhoudt; Qualidade interna do Estado de Conhecimento (Lovitts marcado pela originalidade; e Metodologia de aprendizagem colaborativa. Conclui pela complexidade da produção de um Estado de Conhecimento decorrente das inúmeras inter-relações sócio-científicas e resgata sua importância para a inserção no campo cientifico e na área do objeto de pesquisa.
Van Gogh e o campo de trigo com corvos: da tela ao videoclipe

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Maria Adélia Menegazzo

2015-09-01

Full Text Available Há tempos sendo tema de reflexões e discussões entre pensadores, teóricos e artistas, a relação interartes se mantém e se renova nas manifestações artísticas contemporâneas. Hoje, o elo entre as artes e as discussões sobre o tema se estendem para outros campos, indo além da literatura e da pintura, e incluindo a fotografia, o cinema e, ainda, novas mídias, como a publicidade e o videoclipe. Este artigo apresenta uma reflexão sobre o elo entre diferentes formas de arte, o engendramento de uma obra de arte em outra, demonstrando mecanismos do exercício interartes, a partir da tela de Vincent Van Gogh, Campo de trigo com corvos. Propõe-se, então, uma análise sobre a maneira como o tema da pintura, as cores azul e amarelo, bem como os corvos, aparecem em outras manifestações artísticas, neste caso a poesia (À luz dos vegetais, de Contador Borges, o cinema (Sonhos, de Akira Kurosawa, a música e o videoclipe (Corvos sobre o campo, da banda Tantra. Como aporte teórico, são usados os conceitos de multimídia e mixmídia, de Claus Clüver, e descrição e translação pictural, de Liliane Louvel, assim como as discussões de Thiago Soares no que diz respeito a videoclipes.
Educação do campo e pedagogia da alternância no Brasil e na Amazônia: bases históricas

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Maria Sueli Corrêa dos Prazeres

2013-11-01

Full Text Available O artigo tem como objetivo refletir sobre a Educação do Campo e a Pedagogia da Alternância no Brasil e na Amazônia. No primeiro momento retrata o contexto histórico da Educação do Campo, enfocando os desafios do Movimento Por Uma Educação do Canpo destacando a necessidade de políticas públicas para o contexto amazônico, apontando as demandas e as perspectivas da educação para o meio rural. No segundo momento contextualiza a Pedagogia da Alternância focalizando sua origem, questões conceituais, situando a mesma no Estado do Pará. O movimento por uma educação do campo constituído por movimentos sociais que se organizam a partir do campo e que têm apoio de educadores, intelectuais, universidades públicas e organizações não-governamentais. Este movimento, desde a década de 1990, vem constituindo uma discussão teórica sobre a educação do campo como estratégia contra hegemônica frente às políticas do Estado brasileiro direcionadas às populações do campo. Em nosso país o desenvolvimento da Pedagogia da Alternância ganha materialidade como estratégia de inúmeros movimentos sociais organizadas nos Centros Familiares de Formação em Alternância (CEFFAS. É importante enfatizar que a proposição tem sido utilizada como estratégia para garantir a participação de amplos segmentos da sociedade nas decisões e encaminhamentos, garantindo assim, a educação aos filhos dos sujeitos do campo.
LA TEORÍA DE LOS CAMPOS DESDE EL PRISMA DE LA LITERATURA / Fields theory through the prism of literature

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Joseph Jurt

2015-07-01

Full Text Available Nota de la traducción: el siguiente texto fue escrito por Joseph Jurt expresamente como introducción para su libro Naciones literarias. Una sociología histórica del campo literario (Villa María, Eduvim, 2014, Colección Entreculturas, compilación de artículos traducida y publicada por el Programa de Historia y Antropología del IDACOR (CONICET/ UNC. Finalmente no integró esa edición, pero por su riqueza e interés lo compartimos aquí. Presenta una síntesis de los problemas analíticos abordados en el libro en torno a la noción de campo literario y sus relaciones con los campos político, científico y artístico, así como sobre la lógica del campo de la recepción.Abstract This article was originally written by Joseph Jurt expressly as an introduction to Naciones literatias. Una sociología histórica del campo literario (Literary Nations. A historical sociology of the literary field, a compilation of texts translated and published by IDACOR (CONICET / UNC Program of History and Anthropology in its book series Entreculturas (Villa Maria, Eduvim, 2014. Finally this text did not integrate the book, but for its richness and interest we decided to share it in the RMA. It presents a synthesis of the analytical issues addressed in the book about the notion of literary field and its relations with the political, scientific and artistic fields, as well as the logic of the fields of reception.
Contribuição ao Conhecimento dos Solos dos Campos Gerais no Estado do Paraná

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Bodziak Jr. Carlos

2001-01-01

Full Text Available The present work is the first contribution for the knowledge of the Campos Gerais soils, the study of which was started by the Biological Institute and Technological Research, in Curitiba. In it there are discussed the soils of the Vila Velha region. Exposed the geological constitution of the landscape integrated by devonian beds in the Campos Gerais serie and the glacial deposits of the Itararé formation, the results of petrographic-sediment researches and the coefficients of selection of various sediments are given. A rapid exposition of the phytogeographic and climate conditions - according to Koeppen = 7 Cfb - is followed by the presentation of the results of the physical and chemical researches made in the soils of eight profiles, illustrated with the corresponding charts and by volumetric-chemical diagrams. The authors came to the conclusion that the part of Campos Gerais here taken into consideration is characterized by poor and washed soils, motivated by geological and climatic conditions. These soils lack specially in phosphorus, calcium, nitrogen and potassium. Two of the profiles constituted exception as they correspond to the area covered by a forest island, therefore, showing its soils in a little better condition.
Óxidos de ferro e área superficial de Latossolo subtropical sob campo e floresta nativa

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Alberto Vasconcellos Inda

2014-02-01

Full Text Available As condições climáticas atuais indicam avanço da vegetação de floresta sobre os campos na região dos Campos de Cima da Serra no Rio Grande do Sul. Essa mudança na vegetação altera o conteúdo de matéria orgânica e a umidade do solo. Este estudo objetivou avaliar os óxidos de ferro pedogênicos em um Latossolo sob campo e floresta nativa e relacionar os mesmos com os teores de carbono orgânico e a área superficial específica do solo. Os teores de carbono orgânico são maiores no solo sob floresta e, possivelmente, influenciaram processos dissolutivos de óxidos de ferro cristalinos e a neoformação de tipos metaestáveis de baixa cristalinidade. O incremento de C orgânico no solo sob floresta elevou expressivamente a área superficial específica do solo, mascarando o efeito geralmente positivo dos óxidos de Fe sobre essa característica física.

La Neurociencia Computacional hoy: II. El Proyecto Blue Brain, un ejemplo muy representativo en el campo

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Jesús Cortés

2009-01-01

Full Text Available La Neurociencia Computacional es un campo reciente, pero bien establecido dentro de las Neurociencias. En un primer artículo (Cortés, 2009, http://www.cienciacognitiva.org/?p=55, “Qué es y por qué es difícil su estudio”, explico su principal paradigma: todo proceso mental que tiene lugar en nuestro cerebro tiene un circuito o cableado físico que lo sustenta. En este artículo comento un ejemplo muy representativo en el campo: el macro-proyecto de simulación a gran escala y en tiempo real de procesos en la corteza cerebral, el famoso Blue Brain Project.
Machining of Machine Elements Made of Polymer Composite Materials

Science.gov (United States)

Baurova, N. I.; Makarov, K. A.

2017-12-01

The machining of the machine elements that are made of polymer composite materials (PCMs) or are repaired using them is considered. Turning, milling, and drilling are shown to be most widely used among all methods of cutting PCMs. Cutting conditions for the machining of PCMs are presented. The factors that most strongly affect the roughness parameters and the accuracy of cutting PCMs are considered.
Anomalous Plasma Diffusion in Magnetic Wells; Diffusion Anormale de Plasma dans des Puits Magnetique; Anomal'naya diffuziya plazmy v magnitnykh yamakh; Difusion Anomala de Plasma en Pozos Magneticos

Energy Technology Data Exchange (ETDEWEB)

Fowler, T. K.; Guest, G. E. [Oak Ridge National Laboratory, Oak Ridge, TN (United States)

1966-04-15

examinan aplicaciones a diversos sistemas de confinamiento termonuclear. En algunos casos, los resultados son alentadores y complementan la conclusion anterior de los autores, segfin la cual tambien la difusion estocastica es admisible para la fusion. Subsiste el interrogante del valor limite de {beta} y el comportamiento no lineal de ciertas inestabilidades en el espacio de las velocidades para {omega} Greater-Than-Or-Equal-To {omega}{sub ci}, la frecuencia de giro de los iones. Al deducir la ecuacion (IX los autores consideran que D{sub Up-Tack} = {lambda}(cE{sub Up-Tack }/B), donde {lambda} es la 'longitud de mezcla' radial. Estiman el valor de E{sub Up-Tack} a partir de la energia libre disponible, compuesta por dos terminos, Greek-Small-Letter-Delta W = Greek-Small-Letter-Delta W{sub 0} + Greek-Small-Letter-Delta W{sub 1}. El primero, Greek-Small-Letter-Delta W{sub 1}, es el termino corriente de estabilizacion en un pozo magnetico o un pozo 'promedio' si se conservan el momento magnetico {mu} y el invariante longitudinal J. El termino Greek-Small-Letter-Delta W{sub 1}, tiene en cuenta los casos en que no se cumple la invariancia adiabatica. Los autores estiman su valor sobre la base de la termodinamica no lineal. Puede haber una considerable contribucion positiva a 6W proveniente de la liberacion de energia termica, analogamente al enfriamiento de un gas por expansion, lo que explica la difusion anomala en varios experimentos con dB/dr Less-Than-Or-Equal-To 0. Cuando dB/dr es positiva y suficientemente grande, Greek-Small-Letter-Delta W{sub 0} es negativa y supera aquella. Unicamente en ese caso la pequena energia de deriva azimutal provoca el crecimiento del campo. Los autores comparan los resultados obtenidos con la teoria lineal, despreciando la energia de deriva. (author) [Russian] Obsuzhdaetsja radial'noe peremeshhenie plazmy v magnitnyh jamah (magnitnyj gradient dB/dr> 0), osoboe vnimanie udeljaetsja nizkochastotnym neustojchivostjam, ne stabilizirujushhimsja za
Improving Machining Accuracy of CNC Machines with Innovative Design Methods

Science.gov (United States)

Yemelyanov, N. V.; Yemelyanova, I. V.; Zubenko, V. L.

2018-03-01

The article considers achieving the machining accuracy of CNC machines by applying innovative methods in modelling and design of machining systems, drives and machine processes. The topological method of analysis involves visualizing the system as matrices of block graphs with a varying degree of detail between the upper and lower hierarchy levels. This approach combines the advantages of graph theory and the efficiency of decomposition methods, it also has visual clarity, which is inherent in both topological models and structural matrices, as well as the resiliency of linear algebra as part of the matrix-based research. The focus of the study is on the design of automated machine workstations, systems, machines and units, which can be broken into interrelated parts and presented as algebraic, topological and set-theoretical models. Every model can be transformed into a model of another type, and, as a result, can be interpreted as a system of linear and non-linear equations which solutions determine the system parameters. This paper analyses the dynamic parameters of the 1716PF4 machine at the stages of design and exploitation. Having researched the impact of the system dynamics on the component quality, the authors have developed a range of practical recommendations which have enabled one to reduce considerably the amplitude of relative motion, exclude some resonance zones within the spindle speed range of 0...6000 min-1 and improve machining accuracy.
Machinability of nickel based alloys using electrical discharge machining process

Science.gov (United States)

Khan, M. Adam; Gokul, A. K.; Bharani Dharan, M. P.; Jeevakarthikeyan, R. V. S.; Uthayakumar, M.; Thirumalai Kumaran, S.; Duraiselvam, M.

2018-04-01

The high temperature materials such as nickel based alloys and austenitic steel are frequently used for manufacturing critical aero engine turbine components. Literature on conventional and unconventional machining of steel materials is abundant over the past three decades. However the machining studies on superalloy is still a challenging task due to its inherent property and quality. Thus this material is difficult to be cut in conventional processes. Study on unconventional machining process for nickel alloys is focused in this proposed research. Inconel718 and Monel 400 are the two different candidate materials used for electrical discharge machining (EDM) process. Investigation is to prepare a blind hole using copper electrode of 6mm diameter. Electrical parameters are varied to produce plasma spark for diffusion process and machining time is made constant to calculate the experimental results of both the material. Influence of process parameters on tool wear mechanism and material removal are considered from the proposed experimental design. While machining the tool has prone to discharge more materials due to production of high energy plasma spark and eddy current effect. The surface morphology of the machined surface were observed with high resolution FE SEM. Fused electrode found to be a spherical structure over the machined surface as clumps. Surface roughness were also measured with surface profile using profilometer. It is confirmed that there is no deviation and precise roundness of drilling is maintained.
The achievements of the Z-machine; Les exploits de la Z-machine

Energy Technology Data Exchange (ETDEWEB)

Larousserie, D

2008-03-15

The ZR-machine that represents the latest generation of Z-pinch machines has recently begun preliminary testing before its full commissioning in Albuquerque (Usa). During its test the machine has well operated with electrical currents whose intensities of 26 million Ampere are already 2 times as high as the intensity of the operating current of the previous Z-machine. In 2006 the Z-machine reached temperatures of 2 billions Kelvin while 100 million Kelvin would be sufficient to ignite thermonuclear fusion. In fact the concept of Z-pinch machines was imagined in the fifties but the technological breakthrough that has allowed this recent success and the reborn of Z-machine, was the replacement of gas by an array of metal wires through which the electrical current flows and vaporizes it creating an imploding plasma. It is not well understood why Z-pinch machines generate far more radiation than theoretically expected. (A.C.)
Quantum machine learning.

Science.gov (United States)

Biamonte, Jacob; Wittek, Peter; Pancotti, Nicola; Rebentrost, Patrick; Wiebe, Nathan; Lloyd, Seth

2017-09-13

Fuelled by increasing computer power and algorithmic advances, machine learning techniques have become powerful tools for finding patterns in data. Quantum systems produce atypical patterns that classical systems are thought not to produce efficiently, so it is reasonable to postulate that quantum computers may outperform classical computers on machine learning tasks. The field of quantum machine learning explores how to devise and implement quantum software that could enable machine learning that is faster than that of classical computers. Recent work has produced quantum algorithms that could act as the building blocks of machine learning programs, but the hardware and software challenges are still considerable.
Machine protection systems

CERN Document Server

Macpherson, A L

2010-01-01

A summary of the Machine Protection System of the LHC is given, with particular attention given to the outstanding issues to be addressed, rather than the successes of the machine protection system from the 2009 run. In particular, the issues of Safe Machine Parameter system, collimation and beam cleaning, the beam dump system and abort gap cleaning, injection and dump protection, and the overall machine protection program for the upcoming run are summarised.
Historia Reciente: apuntes sobre un campo de investigación en expansión

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Marina Franco

Full Text Available Este artículo se dedica a presentar las que consideramos características centrales del campo de la Historia Reciente, que en Argentina desarrolla en la última década un proceso de consolidación intelectual e institucional y una marcada expansión en la cantidad de investigaciones -plasmadas en tesis, artículos, libros y ponencias-. Repasamos para ello los principales problemas epistemológicos y políticos de esta área de la historiografía, presentamos algunos datos cuantitativos para dar cuenta del proceso de expansión, proponemos un balance de los principales nudos en que se concentra la producción y señalamos las áreas de vacancia y desafíos con que se encuentra el campo de la Historia Reciente en la actualidad.
Los campos de golf en España y sus repercusiones en el sector turístico

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Francisco Feo Parrondo

2001-01-01

Full Text Available El golf es uno de los deportes con más crecimiento en España en las dos últimas décadas, triplicándose el número de campos y multiplicándose casi por 18 el de golfistas federados. Los campos se reparten por todo el territorio aunque siguen predominando los ubicados cerca de la costa mediterránea para que en ellos jueguen turistas europeos, sobre todo británicos. Por sus altos costes sigue siendo un deporte de élite que reporta ingresos turísticos muy elevados.
Preliminary Test of Upgraded Conventional Milling Machine into PC Based CNC Milling Machine

International Nuclear Information System (INIS)

Abdul Hafid

2008-01-01

CNC (Computerized Numerical Control) milling machine yields a challenge to make an innovation in the field of machining. With an action job is machining quality equivalent to CNC milling machine, the conventional milling machine ability was improved to be based on PC CNC milling machine. Mechanically and instrumentally change. As a control replacing was conducted by servo drive and proximity were used. Computer programme was constructed to give instruction into milling machine. The program structure of consists GUI model and ladder diagram. Program was put on programming systems called RTX software. The result of up-grade is computer programming and CNC instruction job. The result was beginning step and it will be continued in next time. With upgrading ability milling machine becomes user can be done safe and optimal from accident risk. By improving performance of milling machine, the user will be more working optimal and safely against accident risk. (author)
Considerações sobre um campo científico em formação: Bourdieu e a "nova ciência" do turismo

OpenAIRE

Meira, Fabio Bittencourt; Meira, Mônica Birchler Vanzella

2007-01-01

O artigo discute a proposição de que o turismo é uma "nova ciência". Tomando como referencial teórico o conceito de campo científico, em Pierre Bourdieu, o artigo analisa a proposta de "cientifização do turismo" apresentada por Jafar Jafari, para evidenciar que o turismo é um campo científico em formação. O problema da legitimação desse novo campo é discutido, e se identifica, como sintoma da necessidade de legitimação, a recorrência a signos da economia e dos negócios, consubstanciados num d...
Estimativa da capacidade de campo pela curva de retenção e pela densidade de fluxo da água

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Alexsandro dos Santos Brito

2011-12-01

Full Text Available A capacidade de campo é um parâmetro de inegável relevância para o manejo adequado da irrigação. A partir da determinação confiável do conteúdo de água no solo na capacidade de campo, pode-se otimizar a produtividade das culturas agrícolas, maximizando a eficiência do uso da água pelas plantas e evitando a contaminação do lençol freático por lixiviação de fertilizantes e agroquímicos. Nesse sentido, o trabalho teve como objetivo avaliar a capacidade de campo (a pelo cálculo da densidade de fluxo da água durante o processo de redistribuição no experimento clássico de determinação desse parâmetro e (b a partir de uma dada tensão da água na curva de retenção, em um Latossolo Vermelho-Amarelo textura média, localizado em área experimental da Escola Superior de Agricultura Luiz de Queiroz, município de Piracicaba, Estado de São Paulo (Brasil. Para isso, instalaram-se no solo, até a profundidade de 1,9 m, 60 tubos de acesso a uma sonda de nêutrons, numa rede de malha quadrada de 5 m (6 x 10 pontos amostrais, e, adjacente a cada tubo, dois tensiômetros, um a 0,75 m e outro a 0,85 m de profundidade. Nos 60 pontos (locais amostrais, desenvolveu-se um experimento similar ao experimento clássico de determinação da capacidade de campo, no qual o solo foi devidamente submetido a uma lâmina de infiltração visando à saturação do seu perfil; sua superfície, coberta com lona plástica para evitar fluxo de água através dela; e a redistribuição da água, monitorada até a profundidade de 0,8 m durante 20 dias. Observou-se que o conteúdo de água correspondente a uma densidade de fluxo de 1,0 mm dia-1 é a melhor estimativa da capacidade de campo para esse solo, uma vez que as densidades de fluxo de 0,1 e 0,01 mm dia-1, também recomendadas para estimar a capacidade de campo, são muito baixas, a ponto de não terem sido alcançadas neste estudo. Quanto aos resultados obtidos pelo método baseado na curva de
Experimentación etnográfica: infraestructuras de campo y re-aprendizajes de la antropología

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Estalella, Adolfo

2016-06-01

Full Text Available What form would an ethnographic experimentation exercise take in fieldwork? Ethnographies studying new media, science and global organizations in recent decades offer the chance, or, indeed, present the need, to reconsider norms and forms in ethnographic fieldwork. Based on our ethnographic experience, this article discusses what we define as experimental forms of fieldwork. We make our case by narrating an urban teaching project conducted in close partnership with two architectural groups: an urban learning infrastructure, referenced by vernacular languages in the field, and ethnographic conceptualisations, a recursive technique in which ethnographic findings cause us to revisit our own practice. We argue that this project gives us chance to relearn and reimagine our ethnographic experience, not through the traditional aesthetic of the ethnographic encounter, but through an infrastructural installation that conditions fieldwork for what we describe as an experimental exercise. Rather than breaking away from method, our approach to the experimental seeks to renew the descriptive vocabulary and conceptual language of field accounts in our ethnographies.¿Cómo sería un ejercicio de experimentación etnográfica en el trabajo de campo? Pareciera que las etnografías de las últimas décadas dedicadas al estudio de los nuevos medios, la ciencia y las organizaciones globales nos ofrecieran la posibilidad, o plantearan la necesidad, de reconsiderar la forma y norma del trabajo de campo etnográfico. Este artículo discute a partir de nuestra experiencia etnográfica lo que designamos como formas de trabajo de campo experimentales. Planteamos nuestro argumento a través de la narración de un proyecto de pedagogía urbana realizado en estrecha colaboración con dos colectivos de arquitectura: una infraestructura urbana de aprendizaje, informada por los lenguajes vernáculos del campo y nuestras conceptualizaciones etnográficas, un gesto recursivo
Study of on-machine error identification and compensation methods for micro machine tools

International Nuclear Information System (INIS)

Wang, Shih-Ming; Yu, Han-Jen; Lee, Chun-Yi; Chiu, Hung-Sheng

2016-01-01

Micro machining plays an important role in the manufacturing of miniature products which are made of various materials with complex 3D shapes and tight machining tolerance. To further improve the accuracy of a micro machining process without increasing the manufacturing cost of a micro machine tool, an effective machining error measurement method and a software-based compensation method are essential. To avoid introducing additional errors caused by the re-installment of the workpiece, the measurement and compensation method should be on-machine conducted. In addition, because the contour of a miniature workpiece machined with a micro machining process is very tiny, the measurement method should be non-contact. By integrating the image re-constructive method, camera pixel correction, coordinate transformation, the error identification algorithm, and trajectory auto-correction method, a vision-based error measurement and compensation method that can on-machine inspect the micro machining errors and automatically generate an error-corrected numerical control (NC) program for error compensation was developed in this study. With the use of the Canny edge detection algorithm and camera pixel calibration, the edges of the contour of a machined workpiece were identified and used to re-construct the actual contour of the work piece. The actual contour was then mapped to the theoretical contour to identify the actual cutting points and compute the machining errors. With the use of a moving matching window and calculation of the similarity between the actual and theoretical contour, the errors between the actual cutting points and theoretical cutting points were calculated and used to correct the NC program. With the use of the error-corrected NC program, the accuracy of a micro machining process can be effectively improved. To prove the feasibility and effectiveness of the proposed methods, micro-milling experiments on a micro machine tool were conducted, and the results
O campo profissional da Gestão da Informação El campo profesional de la Gestión de la Información

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Ana Maria Barcellos Malin

2012-10-01

Full Text Available Introdução: A gestão da informação, abordagem tardia da informação como objeto de interesse,materializa-se hoje, no Brasil, como um campo profissional, tanto do ponto de vista educacionalcomo ocupacional. Tornando-se chave para o mercado de trabalho, consolida um mandato deconhecimento.Objetivo: Identificar instituições concretas relacionadas ao atual campo educacional e profissionalda Gestão da Informação no Brasil.Procedimentos Metodologicos: Os indicadores de tendências nesse sentido foram obtidos depesquisa exploratória realizada através de busca sistemática e formal na web brasileira.Resultados: Os resultados apontam as tendências de abordagem multidisciplinar no ensino e deestruturação do mercado de trabalho a partir dos cargos, vagas e concursos promovidos,sobretudo, pelo setor público no Brasil.Conclusão: Conclui sobre a necessidade de a Ciência da Informação se debruçar e aprofundar apesquisa sobre questões derivadas dessas tendências na sociedade brasileira, tanto em relação àformação educacional e profissional como no tocante à relação entre gestão da informação egestão pública no país.
JAIME CAMPOS GARRIDO (1939-2010

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Efraím Otero Ruiz

2011-01-01

Full Text Available
Palabras pronunciadas durante las honras fúnebres, Iglesia Inmaculada Concepción del Chicó, Diciembre 21, 2010
Con el desgarramiento de las calamidades imprevistas y ahogados por la sorpresa y el dolor reprimido, nos agrupamos aquí hoy para decir unas palabras de despedida al inolvidable amigo y colega Jaime Campos Garrido. Porque quienes lo vieron a su regreso de Europa, hacía apenas un mes, jamás se imaginaron que la muerte iría a incluirlo en ese terrible listado que en el último semestre se ha llevado a lo mejor de la gastroenterología clínica y quirúrgica colombianas, en un desfi le interminable de duelos sucesivos: Alvaro Caro Mendoza, Jaime De la Hoz De la Hoz y ahora Jaime, todos después de coronar las más brillantes carreras que la especialidad y la Universidad Nacional avalaron en la última mitad del siglo XX, y todos cercados de ese nimbo de prestigio y amistad que hoy nos hace más insoportable y dolorosa su partida.
Nacido de cuna preclara en Popayán, Jaime terminó sus estudios de médico en la Universidad Nacional en 1964 y desde sus épocas de estudiante mostró la inclinación por la que iría a ser su especialidad definitiva. Muy recién graduado viajó a Francia, donde iría a especializarse por varios años en endoscopia digestiva; allí fue pronto acogido por sus colegas que en etapas sucesivas lo irían incorporando a la Sociedad Nacional Francesa de dicha especialidad, lo mismo que a la Francesa de Gastroenterología y al Círculo André Lambling, del que sería Fundador en 1981 y poco después su Presidente, distinción extraordinaria para un joven especialista proveniente de estas latitudes. A su regreso a Bogotá además como destacado internista, fue fundador en 1967 de la cátedra de Gastroenterología en el Hospital de San Juan de Dios, siguiendo de ahí en adelante por riguroso concurso a ocupar los cargos de Instructor Asociado
National Machine Guarding Program: Part 1. Machine safeguarding practices in small metal fabrication businesses.

Science.gov (United States)

Parker, David L; Yamin, Samuel C; Brosseau, Lisa M; Xi, Min; Gordon, Robert; Most, Ivan G; Stanley, Rodney

2015-11-01

Metal fabrication workers experience high rates of traumatic occupational injuries. Machine operators in particular face high risks, often stemming from the absence or improper use of machine safeguarding or the failure to implement lockout procedures. The National Machine Guarding Program (NMGP) was a translational research initiative implemented in conjunction with two workers' compensation insures. Insurance safety consultants trained in machine guarding used standardized checklists to conduct a baseline inspection of machine-related hazards in 221 business. Safeguards at the point of operation were missing or inadequate on 33% of machines. Safeguards for other mechanical hazards were missing on 28% of machines. Older machines were both widely used and less likely than newer machines to be properly guarded. Lockout/tagout procedures were posted at only 9% of machine workstations. The NMGP demonstrates a need for improvement in many aspects of machine safety and lockout in small metal fabrication businesses. © 2015 The Authors. American Journal of Industrial Medicine published by Wiley Periodicals, Inc.
MITIGACIÓN DE CAMPO MAGNÉTICO DE LÍNEAS DE TRANSMISIÓN UTILIZANDO BUCLES PASIVOS MITIGAÇÃO DE CAMPO MAGNÉTICO DE LINHAS DE TRANSMISSÃO UTILIZANDO BUCLES PASSIVOS MAGNETIC FIELD MITIGATION OF TRANSMISSION LINES USING PASSIVE LOOPS

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Diego Raúl Cadavid

2010-07-01

Full Text Available En este artículo se presenta un método simple para determinar el campo magnético generado por líneas de transmisión. El cálculo del campo magnético tiene en cuenta los efectos de mitigación de bucles pasivos, incluyendo su ubicación óptima en la línea mediante la aplicación de algoritmos genéticos. Los resultados de los cálculos son validados mediante reportes de casos publicados en el IEEE, software de análisis de campo electromagnético y datos experimentales arrojados de una implementación realizada en las líneas de alimentación de las torres de iluminación en un estadio. Luego del análisis, se demuestra la validez del método y la factibilidad de aplicarlo en líneas de transmisión del sistema de potencia.Neste artigo se apresenta um método simples para determinar o campo magnético gerado por linhas de transmissão. O cálculo do campo magnético leva em conta os efeitos de mitigação de loops passivos, incluindo sua localização ótima na linha mediante a aplicação de algoritmos genéticos. Os resultados dos cálculos são validados mediante reportes de casos publicados no IEEE, software de análise de campo eletromagnético e dados experimentais arrojados de uma implementação realizada nas linhas de alimentação das torres de iluminação em um estádio. Depois da análise, se demonstra a validade do método e a factibilidade de aplicá-lo em linhas de transmissão do sistema de potência.A simple method to determine the magnetic field generated by transmission lines is presented in this paper. The magnetic field calculation takes into account the mitigating effects of passive loops, including their optimal position in the line by applying genetic algorithms. Calculations results are validated by case reports published in the IEEE Transactions, software package for electromagnetic field analysis, and experimental data obtained from an implementation made in the power lines at a stadium lighting tower. After
Non-conventional electrical machines

CERN Document Server

Rezzoug, Abderrezak

2013-01-01

The developments of electrical machines are due to the convergence of material progress, improved calculation tools, and new feeding sources. Among the many recent machines, the authors have chosen, in this first book, to relate the progress in slow speed machines, high speed machines, and superconducting machines. The first part of the book is dedicated to materials and an overview of magnetism, mechanic, and heat transfer.

ESTADO, POLÍTICA E EDUCAÇÃO DO CAMPO: UMA RE-VISÃO DE CONCEITOS Á LUZ DA PEDAGOGIA HISTÓRICO CRÍTICA

OpenAIRE

Freitas, Glez Rodrigues; Souza, Rosana Ramos de

2015-01-01

O presente artigo trata de uma releitura embasada por referenciais teóricos e debates sobre Sociedade, Estado e Política Educacional, relacionando-os à temática da educação do campo. As análises contidas nesse artigo abordam a compreensão de conceitos como: Estado, política educacional, educação do campo, relação educação-trabalho, igualdade-equidade, alternância, etc. Evidenciando assim, um campo de possibilidades para explicitar a escolha por uma abordagem que abarque e justifique as necess...
TRABALHOS DE CAMPO NAS DISCIPLINAS DE GEOLOGIA INTRODUTÓRIA: CURSOS DE GEOGRAFIA NO ESTADO DO PARANÁ

Directory of Open Access Journals (Sweden)

Adalberto SCORTEGAGNA

2005-11-01

Full Text Available A pesquisa busca analisar as atividades de campo na disciplina de Geologia Introdutória nos cursos de Geografia no Estado do Paraná. Os dados foram coletados por meio de entrevistas com os professores responsáveis pela disciplina, nas instituições de ensino que mantêm o curso de Geografia no Estado. A análise dos resultados possibilitou caracterizar a prática dos professores nas atividades de campo, desde a preparação até a execução, além de constatar as diferentes visões de ensino dos diferentes profissionais que atuam nesta disciplina. Os depoimentos dos professores foram examinados a partir de duas categorias de análise: as características das saídas de campo e as concepções sobre a disciplina de Geologia Introdutória. A análise demonstrou que não há diferenças significativas entre os professores no que diz respeito aos trabalhos realizados em campo, independentemente da formação, titulação e instituição onde atuam. As diversas alternativas de trabalhos de campo ainda estão distantes da prática da maioria dos professores, que optam por atividades voltadas ao reconhecimento no campo de conteúdos desenvolvidos em sala de aula. Entretanto, revelaram-se duas concepções distintas quanto ao papel da disciplina no curso e os conteúdos que deve abranger: a visão do professor geólogo e a visão do professor geógrafo. Em que pese tais diferenças, as concepções de ambos os profissionais não são, de modo geral, compatíveis com as características e conteúdos dos trabalhos de campo que promovem. Fieldwork on the Courses of Introductory Geology: Courses of Geography in the State of Paraná Abstract The research aims at analyzing the activities of field in courses of Introductory Geology in the Geography Schools in the State of the Paraná. The data had been collected by means of interviews with the responsible professors for the course, in the educational institutions that keep the course of Geography in the
El método de trabajo de campo y laboratorio en las Ciencias Naturales de E.G.B.

Directory of Open Access Journals (Sweden)

Miguel-C SÁNCHEZ-BARBUDO RUIZ-TAPIADOR

2009-11-01

Full Text Available En este artículo pretendemos describir, aunque de forma general, el método de campo y laboratorio que ha sido experimentado por nosotros, a nivel de Escuela Universitaria de Formación del Profesorado de E.G.B., desde el curso 1974-75 hasta la actualidad. Se hace hincapié en las características, objetivos y fases a tener en cuenta durante la puesta en marcha y desarrollo del método, así como del trabajo en el campo y en el laboratorio.
O TRABALHO DE CAMPO COMO RECURSO DIDÁTICO NA GEOGRAFIA: O EXEMPLO DO TRAJETO PARANAPIACABA A CUBATÃO

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Emerson Galvani

2008-04-01

Full Text Available O texto que se apresenta é um relato da experiência de trabalho de campo realizado nas disciplinas de Climatologia I e II do Departamento de Geografia da FFLCH/USP. O percurso realizado compreende o perfil de Paranapiacaba (Município de Santo André, SP até Cubatão, SP em um desnível aproximado de 800 m. São apresentados e discutidos resultados de um dos trabalhos de campo realizados primeiro semestre de 2008, assim como os procedimentos, dicas e instrumental necessário para esta atividade.
WITHOUT FEAR TO DARE: DIGITAL INCLUSION IN CAMPOS

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Margarida Maria Mussa Tavares Gomes

2010-05-01

Full Text Available The debate concerning changes brought by new technologies has shown that knowledge has been increasingly pointed out as a key / crucial factor in establishing or overcoming social and economic inequality, in creating or eliminating job opportunities and, in disseminating or concentrating well-being. However, participating in the Information Society is a far reality for most of the world population. With the aim of discussing the concept of digital inclusion and possible ways of making it work, two experiments in Campos dos Goytacazes, Rio de Janeiro State, Brazil, are examined: the CITIZEN INFORMATICS PROJECT (Projeto Informática Cidadã and the SURFING IS NECESSARY PROJECT (Projeto Navegar é Preciso.
Advanced Machine learning Algorithm Application for Rotating Machine Health Monitoring

Energy Technology Data Exchange (ETDEWEB)

Kanemoto, Shigeru; Watanabe, Masaya [The University of Aizu, Aizuwakamatsu (Japan); Yusa, Noritaka [Tohoku University, Sendai (Japan)

2014-08-15

The present paper tries to evaluate the applicability of conventional sound analysis techniques and modern machine learning algorithms to rotating machine health monitoring. These techniques include support vector machine, deep leaning neural network, etc. The inner ring defect and misalignment anomaly sound data measured by a rotating machine mockup test facility are used to verify the above various kinds of algorithms. Although we cannot find remarkable difference of anomaly discrimination performance, some methods give us the very interesting eigen patterns corresponding to normal and abnormal states. These results will be useful for future more sensitive and robust anomaly monitoring technology.
Advanced Machine learning Algorithm Application for Rotating Machine Health Monitoring

International Nuclear Information System (INIS)

Kanemoto, Shigeru; Watanabe, Masaya; Yusa, Noritaka

2014-01-01

The present paper tries to evaluate the applicability of conventional sound analysis techniques and modern machine learning algorithms to rotating machine health monitoring. These techniques include support vector machine, deep leaning neural network, etc. The inner ring defect and misalignment anomaly sound data measured by a rotating machine mockup test facility are used to verify the above various kinds of algorithms. Although we cannot find remarkable difference of anomaly discrimination performance, some methods give us the very interesting eigen patterns corresponding to normal and abnormal states. These results will be useful for future more sensitive and robust anomaly monitoring technology
A AÇÃO DE AGENTES SOCIAIS NO CAMPO DOS ALEMÃES EM SÃO JOSÉ DOS CAMPOS, SP: GRAFFITI E APROPRIAÇÃO DO ESPAÇO URBANO

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Frederico Papali

2016-11-01

Full Text Available Este trabalho busca levantar as impressões e repercussões causadas pelo Mutirão Graffiti, 3º Encontro Internacional de Graffiti ocorrido no bairro Campo dos Alemães, zona Sul da cidade de São José dos Campos em março de 2013. Entendido como um movimento social contemporâneo, pretende-se compreender como as pessoas que pertencem ao lugar o perceberam, enquanto significado e expressão social. O Mutirão reuniu quase três centenas de artistas do Brasil e do exterior e se deu em doze ruas do bairro, que serviram de pano de fundo das obras para a promoção da cultura Hip Hop, tendo o Rap, o graffiti e o break como principais manifestações. Esse estudo se baseou nas concepções teóricas de apropriação do espaço, território e lugar e na análise fotográfica do material produzido pelo mutirão, acessado pelo Google Street View e pelos muros do referido bairro, bem como se valeu de entrevista com um dos artistas que organizou e produziu o evento.
Teorias sobre o amor no campo da Psicologia Social

OpenAIRE

Martins-Silva, Priscilla de Oliveira; Trindade, Zeidi Araujo; Silva Junior, Annor da

2013-01-01

Este é um ensaio teórico sobre o fenômeno amor em relacionamentos românticos no campo da Psicologia e no da Psicologia social. São apresentadas as primeiras teorias sobre o amor na Psicologia, e, posteriormente, são abordadas em maior profundidade três teorias da Psicologia social: os estilos de amor de John Alan Lee, a teoria de apego, de Phillip Shaver, Cindy Hazan e Donna Bradshaw, e a teoria triangular do amor, de Robert J. Sternberg. São apresentados os aspectos teóricos, empíricos e met...
Resistencia a lambdacihalotrina y fenitrotión en una población de campo de Panstrongylus geniculatus (Hemiptera: Reduviidae: Triatominae

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Flor A. Torres P

2013-12-01

Full Text Available Introducción: Panstrongylus geniculatus es un triatomino silvestre, vector del Trypanosoma cruzi, intruso en domicilios humanos. Determinar la susceptibilidad a insecticidas de uso común en esta especie es indispensable para detectar prematuramente cepas resistentes. Objetivo: Este estudio se propuso analizar la susceptibilidad a lambdacihalotrina y fenitrotión en dos cepas (laboratorio y campo de P. geniculatus. Metodología: se estableció la susceptibilidad a lambdacihalotrina y fenitrotión por aplicación tópica, en la cepa de laboratorio-Molagavita 2003 y en la población de campo-Chorreras 2012 en ninfas del primer estadio de P. geniculatus. Se calcularon valores de dosis letal 50 y dosis letal 99 (DL50 y la DL99 para cada insecticida. También se determinaron valores de grado de resistencia (GR para cada insecticida: DL50 población de campo/DL50 cepa de laboratorio. Resultados: Las DL50 y DL99 en la población de campo y la cepa de laboratorio (en ng/i, fueron: 1,194; 5,764 y 0,024; 0,131 para lambdacihalotrina y 1,476; 7,354 y 0,482; 5,471 para fenitrotión, respectivamente. Los grados de resistencia fueron: GR= 48,9 para lambdacihalotrina y GR= 3,06 para fenitrotión. Conclusiones: La población de campo mostró resistencia a lambdacihalotrina y fenitrotión, probablemente como consecuencia del uso de agroquímicos en la zona. Implementar medidas para la detección temprana de resistencia en triatominos es importante en el diseño de programas de control vectorial.
Electrical machines & drives

CERN Document Server

Hammond, P

1985-01-01

Containing approximately 200 problems (100 worked), the text covers a wide range of topics concerning electrical machines, placing particular emphasis upon electrical-machine drive applications. The theory is concisely reviewed and focuses on features common to all machine types. The problems are arranged in order of increasing levels of complexity and discussions of the solutions are included where appropriate to illustrate the engineering implications. This second edition includes an important new chapter on mathematical and computer simulation of machine systems and revised discussions o
DNA-based machines.

Science.gov (United States)

Wang, Fuan; Willner, Bilha; Willner, Itamar

2014-01-01

The base sequence in nucleic acids encodes substantial structural and functional information into the biopolymer. This encoded information provides the basis for the tailoring and assembly of DNA machines. A DNA machine is defined as a molecular device that exhibits the following fundamental features. (1) It performs a fuel-driven mechanical process that mimics macroscopic machines. (2) The mechanical process requires an energy input, "fuel." (3) The mechanical operation is accompanied by an energy consumption process that leads to "waste products." (4) The cyclic operation of the DNA devices, involves the use of "fuel" and "anti-fuel" ingredients. A variety of DNA-based machines are described, including the construction of "tweezers," "walkers," "robots," "cranes," "transporters," "springs," "gears," and interlocked cyclic DNA structures acting as reconfigurable catenanes, rotaxanes, and rotors. Different "fuels", such as nucleic acid strands, pH (H⁺/OH⁻), metal ions, and light, are used to trigger the mechanical functions of the DNA devices. The operation of the devices in solution and on surfaces is described, and a variety of optical, electrical, and photoelectrochemical methods to follow the operations of the DNA machines are presented. We further address the possible applications of DNA machines and the future perspectives of molecular DNA devices. These include the application of DNA machines as functional structures for the construction of logic gates and computing, for the programmed organization of metallic nanoparticle structures and the control of plasmonic properties, and for controlling chemical transformations by DNA machines. We further discuss the future applications of DNA machines for intracellular sensing, controlling intracellular metabolic pathways, and the use of the functional nanostructures for drug delivery and medical applications.
Considerações sobre um campo científico em formação: Bourdieu e a "nova ciência" do turismo

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Fabio Bittencourt Meira

Full Text Available O artigo discute a proposição de que o turismo é uma "nova ciência". Tomando como referencial teórico o conceito de campo científico, em Pierre Bourdieu, o artigo analisa a proposta de "cientifização do turismo" apresentada por Jafar Jafari, para evidenciar que o turismo é um campo científico em formação. O problema da legitimação desse novo campo é discutido, e se identifica, como sintoma da necessidade de legitimação, a recorrência a signos da economia e dos negócios, consubstanciados num discurso dominante: o turismo-indústria. A crítica aos fundamentos da identidade entre turismo e indústria revela os limites de seu potencial de cientificidade, levando ao impasse o projeto de "cientifização". Finalmente, como contraponto ao discurso dominante, os autores sugerem situar a "cientifização" do turismo noutro contexto, esboçando uma proposta crítica e dialógica, visando aderir maior autonomia ao novo campo.
Machine translation

Energy Technology Data Exchange (ETDEWEB)

Nagao, M

1982-04-01

Each language has its own structure. In translating one language into another one, language attributes and grammatical interpretation must be defined in an unambiguous form. In order to parse a sentence, it is necessary to recognize its structure. A so-called context-free grammar can help in this respect for machine translation and machine-aided translation. Problems to be solved in studying machine translation are taken up in the paper, which discusses subjects for semantics and for syntactic analysis and translation software. 14 references.
Calculation of the electromagnetic fields in electric machines through the use of the finite element. Algorithms for the solution of induction problems. Pt. 3; Calculo de campos electromagneticos en maquinas electricas mediante elemento finito. Algoritmos para la solucion de problemas de induccion. Pt. 3

Energy Technology Data Exchange (ETDEWEB)

Rosales, Mario F [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1988-12-31

This article is based in the electromagnetic modeling presented in the first part of the series for the indirect solution of partial differential equations. Magnetic systems in closed regions with moving or axial symmetry, whose total current density is partially known (induction problems) are considered. Includes the ability to deal with means in movement and a sinusoidal behavior for the source density current is assumed. Some algorithms are developed that are implanted in the software CALIIE-2D of the Instituto de Investigaciones Electricas (IIE) to obtain the numerical solutions of these problems. The basic systems of algebraic equations are obtained through the application of the Galerkin method in the discreteness of the finite element with first order triangular elements. [Espanol] Este articulo se basa en la modelacion electromagnetica presentada en la primera parte de la serie y en el planteamiento proporcionado en la segunda parte para la solucion indirecta de ecuaciones diferenciales parciales. Se consideran sistemas magneticos en regiones cerradas con simetria traslacional o axial, cuya densidad de corriente total es parcialmente conocida (problemas de induccion). Incluye la capacidad para tratar medios con movimiento y se supone un comportamiento senoidal para la densidad de corriente fuente. Se desarrollan los algoritmos que se implantan en el programa de computo CALIIE-2D del Instituto de Investigaciones Electricas (IIE) para obtener las soluciones numericas de estos problemas. Los sistemas basicos de ecuaciones algebraicas se obtienen mediante la aplicacion del metodo de Galerkin en la discretizacion de elemento finito con elementos triangulares de primer orden.
Induction machine handbook

CERN Document Server

Boldea, Ion

2002-01-01

Often called the workhorse of industry, the advent of power electronics and advances in digital control are transforming the induction motor into the racehorse of industrial motion control. Now, the classic texts on induction machines are nearly three decades old, while more recent books on electric motors lack the necessary depth and detail on induction machines.The Induction Machine Handbook fills industry's long-standing need for a comprehensive treatise embracing the many intricate facets of induction machine analysis and design. Moving gradually from simple to complex and from standard to
Chaotic Boltzmann machines

Science.gov (United States)

Suzuki, Hideyuki; Imura, Jun-ichi; Horio, Yoshihiko; Aihara, Kazuyuki

2013-01-01

The chaotic Boltzmann machine proposed in this paper is a chaotic pseudo-billiard system that works as a Boltzmann machine. Chaotic Boltzmann machines are shown numerically to have computing abilities comparable to conventional (stochastic) Boltzmann machines. Since no randomness is required, efficient hardware implementation is expected. Moreover, the ferromagnetic phase transition of the Ising model is shown to be characterised by the largest Lyapunov exponent of the proposed system. In general, a method to relate probabilistic models to nonlinear dynamics by derandomising Gibbs sampling is presented. PMID:23558425
Rotating electrical machines

CERN Document Server

Le Doeuff, René

2013-01-01

In this book a general matrix-based approach to modeling electrical machines is promulgated. The model uses instantaneous quantities for key variables and enables the user to easily take into account associations between rotating machines and static converters (such as in variable speed drives). General equations of electromechanical energy conversion are established early in the treatment of the topic and then applied to synchronous, induction and DC machines. The primary characteristics of these machines are established for steady state behavior as well as for variable speed scenarios. I
Your Sewing Machine.

Science.gov (United States)

Peacock, Marion E.

The programed instruction manual is designed to aid the student in learning the parts, uses, and operation of the sewing machine. Drawings of sewing machine parts are presented, and space is provided for the student's written responses. Following an introductory section identifying sewing machine parts, the manual deals with each part and its…
José-Antonio Campos-Ortega (1940-2004) and his scientific work - a personal perspective.

Science.gov (United States)

Knust, Elisabeth; Hertel, Rainer

2009-01-01

José Antonio Campos-Ortega (1940-2004), a Spanish scientist who became a leading figure in the developmental genetics of the nervous system, spent most of his scientific life in Germany. Nevertheless, he remained deeply rooted in his native country. His thinking, his ambition and his work were driven by scientific, philosophical and historical questions. He started as a neuroanatomist, working first in Valencia, then in Gottingen, Tubingen and Freiburg. He used primates, reptiles, then the house fly and finally Drosophila to address the question How is the brain or the eye structured in order to function?. While in Freiburg, the problem shifted to How does the nervous system come into being, into form? Campos-Ortega tried to understand early neurogenesis in Drosophila through formal genetics, by identifying relevant genes and studying their genetic interactions. Since he was convinced that not only a single experimental approach could solve a problem as complex as the development of the nervous system, he also included the molecular biological approach when he moved to Cologne, while maintaining a strong focus on anatomy, embryology and genetics. There, he also started to work on the neurogenesis of the zebrafish, using similar concepts and approaches. Throughout his scientific career, he thought, wrote and taught about the evolution of methods and ideas in his field of research. At Campos-Ortegas early death, an unfinished book manuscript was left, entitled Developmental Genetics. The Path to the Biological Synthesis. Some parts of his introductory overview are included here.

Machine Learning

CERN Multimedia

CERN. Geneva

2017-01-01

Machine learning, which builds on ideas in computer science, statistics, and optimization, focuses on developing algorithms to identify patterns and regularities in data, and using these learned patterns to make predictions on new observations. Boosted by its industrial and commercial applications, the field of machine learning is quickly evolving and expanding. Recent advances have seen great success in the realms of computer vision, natural language processing, and broadly in data science. Many of these techniques have already been applied in particle physics, for instance for particle identification, detector monitoring, and the optimization of computer resources. Modern machine learning approaches, such as deep learning, are only just beginning to be applied to the analysis of High Energy Physics data to approach more and more complex problems. These classes will review the framework behind machine learning and discuss recent developments in the field.
Investigation of the Machining Stability of a Milling Machine with Hybrid Guideway Systems

Directory of Open Access Journals (Sweden)

Jui-Pin Hung

2016-03-01

Full Text Available This study was aimed to investigate the machining stability of a horizontal milling machine with hybrid guideway systems by finite element method. To this purpose, we first created finite element model of the milling machine with the introduction of the contact stiffness defined at the sliding and rolling interfaces, respectively. Also, the motorized built-in spindle model was created and implemented in the whole machine model. Results of finite element simulations reveal that linear guides with different preloads greatly affect the dynamic responses and machining stability of the horizontal milling machine. The critical cutting depth predicted at the vibration mode associated with the machine tool structure is about 10 mm and 25 mm in the X and Y direction, respectively, while the cutting depth predicted at the vibration mode associated with the spindle structure is about 6.0 mm. Also, the machining stability can be increased when the preload of linear roller guides of the feeding mechanism is changed from lower to higher amount.
Introduction to AC machine design

CERN Document Server

Lipo, Thomas A

2018-01-01

AC electrical machine design is a key skill set for developing competitive electric motors and generators for applications in industry, aerospace, and defense. This book presents a thorough treatment of AC machine design, starting from basic electromagnetic principles and continuing through the various design aspects of an induction machine. Introduction to AC Machine Design includes one chapter each on the design of permanent magnet machines, synchronous machines, and thermal design. It also offers a basic treatment of the use of finite elements to compute the magnetic field within a machine without interfering with the initial comprehension of the core subject matter. Based on the author's notes, as well as after years of classroom instruction, Introduction to AC Machine Design: * Brings to light more advanced principles of machine design--not just the basic principles of AC and DC machine behavior * Introduces electrical machine design to neophytes while also being a resource for experienced designers * ...
Precision machining commercialization

International Nuclear Information System (INIS)

1978-01-01

To accelerate precision machining development so as to realize more of the potential savings within the next few years of known Department of Defense (DOD) part procurement, the Air Force Materials Laboratory (AFML) is sponsoring the Precision Machining Commercialization Project (PMC). PMC is part of the Tri-Service Precision Machine Tool Program of the DOD Manufacturing Technology Five-Year Plan. The technical resources supporting PMC are provided under sponsorship of the Department of Energy (DOE). The goal of PMC is to minimize precision machining development time and cost risk for interested vendors. PMC will do this by making available the high precision machining technology as developed in two DOE contractor facilities, the Lawrence Livermore Laboratory of the University of California and the Union Carbide Corporation, Nuclear Division, Y-12 Plant, at Oak Ridge, Tennessee
Are there intelligent Turing machines?

OpenAIRE

Bátfai, Norbert

2015-01-01

This paper introduces a new computing model based on the cooperation among Turing machines called orchestrated machines. Like universal Turing machines, orchestrated machines are also designed to simulate Turing machines but they can also modify the original operation of the included Turing machines to create a new layer of some kind of collective behavior. Using this new model we can define some interested notions related to cooperation ability of Turing machines such as the intelligence quo...
La industria textil en Tierra de Campos afines de la Edad Media

Directory of Open Access Journals (Sweden)

Hipólito Rafael OLIVA HERRER

2009-12-01

Full Text Available RESUMEN: El presente articulo trata de analizar el desarrollo de la industria textil rural en la región de Tierra de Campos, en torno al tradicional centro de producción textil de Palencia, a fines del XV y comienzos del XVI. La producción en el entorno rural conoció un amplio desarrollo basado en la producción de paños de calidad media-baja destinados al consumo interno, y dio lugar a formas organizativas complejas que se constituyeron en una alternativa frente al sistema gremial imperante en la urbe palentina, implicando intereses de un amplio espectro de grupos sociales.ABSTRACT: The present article aims to analyze the spreading of the rural textile industry in the region of Tierra de Campos in the late fifteenth and the early sixteenth centuries, around the traditional productive centre of Palencia. Here rural clothing experienced an important development based on the production of low and medium quality cloth under a putting-out system directed to interregional trade. The interests around rural industry involved a wide range of social groups, giving rise to complex organization forms and arising as an alternative to the traditional gudd stmcture.
Coldness production and heat revalorization: particular machines; Production de froid et revalorisation de la chaleur: machines particulieres

Energy Technology Data Exchange (ETDEWEB)

Feidt, M. [Universite Henri Poincare - Nancy-1, 54 - Nancy (France)

2003-10-01

The machines presented in this article are not the common reverse cycle machines. They use some systems based on different physical principles which have some consequences on the analysis of cycles: 1 - permanent gas machines (thermal separators, pulse gas tube, thermal-acoustic machines); 2 - phase change machines (mechanical vapor compression machines, absorption machines, ejection machines, adsorption machines); 3 - thermoelectric machines (thermoelectric effects, thermodynamic model of a thermoelectric machine). (J.S.)
National machine guarding program: Part 1. Machine safeguarding practices in small metal fabrication businesses

Science.gov (United States)

Yamin, Samuel C.; Brosseau, Lisa M.; Xi, Min; Gordon, Robert; Most, Ivan G.; Stanley, Rodney

2015-01-01

Background Metal fabrication workers experience high rates of traumatic occupational injuries. Machine operators in particular face high risks, often stemming from the absence or improper use of machine safeguarding or the failure to implement lockout procedures. Methods The National Machine Guarding Program (NMGP) was a translational research initiative implemented in conjunction with two workers' compensation insures. Insurance safety consultants trained in machine guarding used standardized checklists to conduct a baseline inspection of machine‐related hazards in 221 business. Results Safeguards at the point of operation were missing or inadequate on 33% of machines. Safeguards for other mechanical hazards were missing on 28% of machines. Older machines were both widely used and less likely than newer machines to be properly guarded. Lockout/tagout procedures were posted at only 9% of machine workstations. Conclusions The NMGP demonstrates a need for improvement in many aspects of machine safety and lockout in small metal fabrication businesses. Am. J. Ind. Med. 58:1174–1183, 2015. © 2015 The Authors. American Journal of Industrial Medicine published by Wiley Periodicals, Inc. PMID:26332060
‘Machinic Trajectories’: Appropriated Devices as Post-Digital Drawing Machines

Directory of Open Access Journals (Sweden)

Andres Wanner

2014-12-01

Full Text Available This article presents a series of works called Machinic Trajectories, consisting of domestic devices appropriated as mechanical drawing machines. These are contextualized within the post-digital discourse, which integrates messy analog conditions into the digital realm. The role of eliciting and examining glitches for investigating a technology is pointed out. Glitches are defined as short-lived, unpremeditated aesthetic results of a failure; they are mostly known as digital phenomena, but I argue that the concept is equally applicable to the output of mechanical machines. Three drawing machines will be presented: The Opener, The Mixer and The Ventilator. In analyzing their drawings, emergent patterns consisting of unpremeditated visual artifacts will be identified and connected to irregularities of the specific technologies. Several other artists who work with mechanical and robotic drawing machines are introduced, to situate the presented works and reflections in a larger context of practice and to investigate how glitch concepts are applicable to such mechanical systems.
Cálculo e análise de efeitos de campo magnético nos estados eletrônicos de impurezas rasas em materiais semicondutores

OpenAIRE

Souza, Gustavo Vanin Bernardino de [UNESP

2009-01-01

São calculados os níveis de energia para o átomo de hidrogênio sob campo magnético uniforme, utilizando o método das diferenças finitas. Estes resultados, quando multiplicados pelo Rydberg efetivo (que depende da massa efetiva e da permitividade elétrica do meio) correspondem à solução do problema de um elétron ligado a uma impureza doadora rasa em um semicondutor sob campo magnético (caso isotrópico, parabólico, não degenerado). Os valores encontrados, para campo nulo, são comparados com a s...
Estilo cognitivo de dependencia-independencia de campo y proceso lector

OpenAIRE

Kirchner, Teresa

1987-01-01

Este estudio trata de determinar si se dan relaciones de covariación entre la aptitud de reestructuración (una de las manifestaciones del constructo «Dependencia-Independencia de campo» (DIC) y el proceso lector.La DIC es uno de los Estilos Cognitivos surgidos a raíz de las investigaciones que sobre la percepción de la verticalidad realizaban Witkin y Asch a finales de los años 40, y que derivó finalmente en un modelo explicativo de las diferencias individuales, basado en el grado de diferenc...
LA INEQUIDAD EN EL CAMPO DE LA SALUD PUBLICA EN AMERICA LATINA: UNA CUESTION CRUCIAL

Directory of Open Access Journals (Sweden)

Bernardo Kliksberg

2002-08-01

Full Text Available América Latina es considerada la región más desigual del planeta. Es el Continente donde, según múltiples fuentes, las polarizaciones son mayores en diversos campos, y el acceso a las oportunidades es marcadamente disímil para los diferentes sectores sociales. ¿Cómo impacta la inequidad latinoamericana el fundamental campo de la salud? ¿Qué problemas determina en esta área decisiva de la vida de las sociedades, y qué obstáculos y trabas pone al avance de los esfuerzos para mejorar la salud?.A pesar de su clara relevancia, este tema ha sido limitadamente puesto a foco. El objetivo de este trabajo es llamar la atención sobre el mismo, y contribuir a estimular este debate tan necesario. Para ello se subraya, en primer término, el papel central de la salud para el desarrollo, se reseñan las amplias brechas que existen, a pesar de ello, a nivel mundial entre países, y a su interior, se encaran ciertos difundidos mitos sobre cómo superar los problemas en salud, se exploran algunos de los principales impactos de la desigualdad de América Latina sobre aspectos básicos del campo de la salud y, finalmente, se sugieren algunas líneas de la gran tarea por realizar para enfrentar el peso de la inequidad sobre la salud pública.
Guía para la construcción de instalaciones deportivas: campo de tiro

OpenAIRE

Bañuls García, Felipe

2017-01-01

Realización de proyectos de campos de tiro de pistola y escopeta tanto de aire comprimido como de fuego, arco, ballesta, tiro al plato y pista de air-soft. Escuela de Arquitectura e Ingeniería de Edificación Universidad Politécnica de Cartagena
75 FR 8986 - Draft Supplemental Environmental Impact Statement for the Proposed Campo Regional Landfill...

Science.gov (United States)

2010-02-26

... Indian Reservation for the purpose of constructing and operating a solid waste landfill, recycling..., (916) 978-6051. SUPPLEMENTARY INFORMATION: The purpose of the proposed action is to address the socio... Campo Indian Reservation to be used for the purpose of constructing and operating a solid waste disposal...
Self-Improving CNC Milling Machine

OpenAIRE

Spilling, Torjus

2014-01-01

This thesis is a study of the ability of a CNC milling machine to create parts for itself, and an evaluation of whether or not the machine is able to improve itself by creating new machine parts. This will be explored by using off-the-shelf parts to build an initial machine, using 3D printing/rapid prototyping to create any special parts needed for the initial build. After an initial working machine is completed, the design of the machine parts will be adjusted so that the machine can start p...
Machine Learning.

Science.gov (United States)

Kirrane, Diane E.

1990-01-01

As scientists seek to develop machines that can "learn," that is, solve problems by imitating the human brain, a gold mine of information on the processes of human learning is being discovered, expert systems are being improved, and human-machine interactions are being enhanced. (SK)
Machining of Metal Matrix Composites

CERN Document Server

2012-01-01

Machining of Metal Matrix Composites provides the fundamentals and recent advances in the study of machining of metal matrix composites (MMCs). Each chapter is written by an international expert in this important field of research. Machining of Metal Matrix Composites gives the reader information on machining of MMCs with a special emphasis on aluminium matrix composites. Chapter 1 provides the mechanics and modelling of chip formation for traditional machining processes. Chapter 2 is dedicated to surface integrity when machining MMCs. Chapter 3 describes the machinability aspects of MMCs. Chapter 4 contains information on traditional machining processes and Chapter 5 is dedicated to the grinding of MMCs. Chapter 6 describes the dry cutting of MMCs with SiC particulate reinforcement. Finally, Chapter 7 is dedicated to computational methods and optimization in the machining of MMCs. Machining of Metal Matrix Composites can serve as a useful reference for academics, manufacturing and materials researchers, manu...
Machine technology: a survey

International Nuclear Information System (INIS)

Barbier, M.M.

1981-01-01

An attempt was made to find existing machines that have been upgraded and that could be used for large-scale decontamination operations outdoors. Such machines are in the building industry, the mining industry, and the road construction industry. The road construction industry has yielded the machines in this presentation. A review is given of operations that can be done with the machines available
IGLESIAS PARA LA DIVERSIDAD SEXUAL: TÁCTICAS DE INCLUSIÓN Y VISIBILIZACIÓN EN EL CAMPO RELIGIOSO EN MÉXICO

Directory of Open Access Journals (Sweden)

Karina Berenice Bárcenas

2014-06-01

Full Text Available Las identidades lésbico-gay, así como las bisexuales y las trans, fueron invisibilizadas del campo religioso. Sin embargo, desde hace algunas décadas han desplegado distintas tácticas de visibilización que están influyendo en la transformación y diversificación de este campo. Aún cuando la presencia de las iglesias para la diversidad sexual es poco notoria, la mayoría de las veces operan por redes invisibles transversales al cristianismo o a las grandes religiones históricas (mormones, judíos, musulmanes, generando versiones ecuménicas así como un paisaje espiritual marcado por la subjetivación e individualización de las creencias. En este texto se muestra cómo aún cuando la presencia de las iglesias para la diversidad sexual en el campo religioso forma parte de un movimiento mundial, observable en la influencia que tuvo la Iglesia de la Comunidad Metropolitana (ICM, de Estados Unidos de América (EUA en la fundación y desarrollo de esta iglesia en México, su configuración, expansión y dinámica, está condicionada a las reglas del juego del campo religioso nacional, en el caso mexicano, impuestas en gran medida por la iglesia católica.
Characteristics of laser assisted machining for silicon nitride ceramic according to machining parameters

International Nuclear Information System (INIS)

Kim, Jong Do; Lee, Su Jin; Suh, Jeong

2011-01-01

This paper describes the Laser Assisted Machining (LAM) that cuts and removes softened parts by locally heating the ceramic with laser. Silicon nitride ceramics can be machined with general machining tools as well, because YSiAlON, which was made up ceramics, is soften at about 1,000 .deg. C. In particular, the laser, which concentrates on highly dense energy, can locally heat materials and very effectively control the temperature of the heated part of specimen. Therefore, this paper intends to propose an efficient machining method of ceramic by deducing the machining governing factors of laser assisted machining and understanding its mechanism. While laser power is the machining factor that controls the temperature, the CBN cutting tool could cut the material more easily as the material gets deteriorated from the temperature increase by increasing the laser power, but excessive oxidation can negatively affect the quality of the material surface after machining. As the feed rate and cutting depth increase, the cutting force increases and tool lifespan decreases, but surface oxidation also decreases. In this experiment, the material can be cut to 3 mm of cutting depth. And based on the results of the experiment, the laser assisted machining mechanism is clarified

Mapeamento de campos hidromórficos na serra Catarinense por meio de modelagem hidrológica

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Jorgeane Schaefer-Santos

Full Text Available Os ecossistemas campestres entremeados aos fragmentos de Floresta com Araucária são comuns na serra catarinense. Existem fortes indicativos de que parte dos campos da região, os não hidromórficos, sobre solos minerais, seja resultante da exploração da floresta ou do impedimento de seu avanço, cuja cobertura, hoje, é inferior a 10%. Porém, os hidromórficos, exclusivamente em Organossolos, ocupando feições específicas na região, dão evidências de serem, embora impactados, naturais. O presente estudo teve como objetivo mapear a localização dos campos hidromórficos, partindo de dados de campo comparados aos mapas de fatores hidrológicos produzidos principalmente a partir do modelo digital de elevação (MDE e rede de drenagem. Os resultados mostram que o comprimento de fluxo superior a 400 m está positivamente correlacionado à profundidade das zonas hidromórficas. Os relevos patamarizados e planos relacionam-se às zonas hidromórficas, porém a escala do estudo não leva à caracterização final das mesmas. Ainda que os resultados sejam em caráter preliminar, nota-se que pesquisas complementares abordando análise espacial do relevo são necessárias.
O projeto da Associação dos Arquivistas Brasileiros para o campo arquivístico

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Eliezer Pires da Silva

Full Text Available Este artigo busca compreender o surgimento do modelo nacional de institucionalização do campo arquivístico, formulado pela Associação dos Arquivistas Brasileiros durante a década de 1970, configurando um quadro corporativista evidenciado pelas conquistas desse associativismo na relação com o Estado brasileiro. Objetiva especificamente analisar o discurso do associativismo arquivístico sobre a institucionalização das esferas acadêmico-universitária do saber arquivístico e sua reserva de mercado profissional. A abordagem metodológica foi utilizar os editoriais da revista Arquivo & Administração, entre 1971 e 1978, selecionando enunciações sobre o processo de institucionalização do campo arquivístico. As análises apontam para uma década de incessantes esforços para eliminar, do campo profissional, o livre exercício da ocupação, para fortalecer o âmbito da formação. Associado à seleção dos enunciados significativos, depreendeu-se a rede de pessoas interessadas nos arquivos, em condições históricas de restrição política, que construiu articulações frente ao Estado, diante de pontos de vista contrários, se tornando um movimento associativo realizador em suas demandas.
Energy-efficient electrical machines by new materials. Superconductivity in large electrical machines

International Nuclear Information System (INIS)

Frauenhofer, Joachim; Arndt, Tabea; Grundmann, Joern

2013-01-01

The implementation of superconducting materials in high-power electrical machines results in significant advantages regarding efficiency, size and dynamic behavior when compared to conventional machines. The application of HTS (high-temperature superconductors) in electrical machines allows significantly higher power densities to be achieved for synchronous machines. In order to gain experience with the new technology, Siemens carried out a series of development projects. A 400 kW model motor for the verification of a concept for the new technology was followed by a 4000 kV A generator as highspeed machine - as well as a low-speed 4000 kW propeller motor with high torque. The 4000 kVA generator is still employed to carry out long-term tests and to check components. Superconducting machines have significantly lower weight and envelope dimensions compared to conventional machines, and for this reason alone, they utilize resources better. At the same time, operating losses are slashed to about half and the efficiency increases. Beyond this, they set themselves apart as a result of their special features in operation, such as high overload capability, stiff alternating load behavior and low noise. HTS machines provide significant advantages where the reduction of footprint, weight and losses or the improved dynamic behavior results in significant improvements of the overall system. Propeller motors and generators,for ships, offshore plants, in wind turbine and hydroelectric plants and in large power stations are just some examples. HTS machines can therefore play a significant role when it comes to efficiently using resources and energy as well as reducing the CO 2 emissions.
Aves associadas ao manejo com fogo em áreas de campo na porção sul do Bioma Mata Atlântica

OpenAIRE

Petry, Maria Virginia; Universidade do Vale do Rio dos Sinos/UNISINOS; Piuco, Roberta da Cruz; Universidade do Vale do Rio dos Sinos/UNISINOS; Brummelhaus, Jaqueline; Universidade do Vale do Rio dos Sinos/UNISINOS

2011-01-01

Ambientes de campo natural estão se tornando cada vez mais ameaçados na região do Planalto das Araucárias, Rio Grande do Sul, Brasil, em parte devido à ação do fogo e à presença do gado. Nos meses de agosto de 2005 e agosto de 2006, foram realizadas expedições a campo, no município de Cambará do Sul, com o objetivo de comparar a riqueza, abundância e discutir as variações da composição da avifauna quanto aos efeitos do fogo em áreas de campo com manejo de fogo controlado e em áreas de camp...
Solución de la ecuación de energía para la determinación de los campos de temperaturas en el corte ortogonal

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Melchor Rodríguez Madrigal

2011-03-01

Full Text Available La ecuación de energía fue resuelta para computar el campo de temperatura resultante de la deformaciónplástica y la interacción entre la herramienta y la pieza. Esta ecuación incluye las condiciones de dispersiónasociadas con el trabajo mecánico. Se presenta un modelo de elementos finitos del proceso de corte ortogonalcon un acoplamiento termo-elástico-plástico del comportamiento material sometido a grandes deformaciones ybasado en una formulación actualizada de Lagrangian. Es asumida una condición de estado plano de deformacióny que la tensión de fluencia del material es una función de la deformación, de la razón de deformación, delendurecimiento por deformación y de la temperatura. El problema es formulado y discretizado, y las ecuacionesresultantes resueltas con el método de los elementos finitos. Como una aplicación el campo de temperatura escalculado para el caso del maquinado de un acero AISI 1020. In this paper the energy equation was solved to compute the temperature field resulting from the plastic strainand the interaction between tool and workpiece. This equation included the dissipation terms associated withmechanical work. It's presented a finite element modeling of the orthogonal metal cutting processes with acoupled model for thermo-elastic-plastic materials under large deformation based on update Lagrangian formulation.It is assumed plane strain conditions and that flow stress is function of strain, strain rate, work hardening andtemperature. The problem is formulated, discretized and the resulting equations solved with the finite elementmethod. As an application the temperature field is computed for the case of machining AISI 1020.
Business tourism: a guest opinion about relationship marketing practices of the hotel network in São José dos Campos (SP Turismo de negócios: a opinião de hóspedes sobre as ações de marketing de relacionamento da rede hoteleira de São José dos Campos (SP

Directory of Open Access Journals (Sweden)

Juliana Fátima da Silva Cané

2013-05-01

Full Text Available This study aimed to analyze the Relationship Marketing used in the hotel network in Sao José dos Campos, facing the tourism business. Relationship Marketing is an ongoing process of identifying and creating new value with individual customers and sharing their benefits for a lifetime partnership and a proper marketing aspect of the hospitality industry. The aim of this study was to identify the views of customers in relation to the practices of Relationship Marketing used by the chain of São José dos Campos (SP. The methodology used in this study consisted of an empirical field studies in which questionnaires were administered to 90 clients of hotels in São José dos Campos. The results indicate that the public, which is partly composed of foreigners, and therefore have references international hotel chain, identify some of the actions taken by the hotel chain. It is evident that the major hotel chains working in the city of São José dos Campos, conduct their business by applying some elements of relationship marketing, which make, in general, the public served opine positively on the services provided.Este trabalho buscou analisar o Marketing de Relacionamento utilizado na rede hoteleira de São José dos Campos, voltada para o turismo de negócios. O Marketing de Relacionamento é o processo contínuo de identificação e criação de novos valores, com clientes individuais, o compartilhamento de seus benefícios durante uma vida toda de parceria e uma vertente do marketing adequada ao setor hoteleiro. O objetivo geral deste trabalho foi identificar a opinião dos clientes em relação às práticas de Marketing de Relacionamento usadas pela rede hoteleira de São José dos Campos (SP. A metodologia utilizada neste estudo consistiu em uma pesquisa empírica de campo, na qual foram aplicados questionários a 90 clientes dos hotéis de São José dos Campos. Os resultados indicaram que o público, que é parcialmente composto por
VIRTUAL MACHINES IN EDUCATION – CNC MILLING MACHINE WITH SINUMERIK 840D CONTROL SYSTEM

Directory of Open Access Journals (Sweden)

Ireneusz Zagórski

2014-11-01

Full Text Available Machining process nowadays could not be conducted without its inseparable element: cutting edge and frequently numerically controlled milling machines. Milling and lathe machining centres comprise standard equipment in many companies of the machinery industry, e.g. automotive or aircraft. It is for that reason that tertiary education should account for this rising demand. This entails the introduction into the curricula the forms which enable visualisation of machining, milling process and virtual production as well as virtual machining centres simulation. Siemens Virtual Machine (Virtual Workshop sets an example of such software, whose high functionality offers a range of learning experience, such as: learning the design of machine tools, their configuration, basic operation functions as well as basics of CNC.
Intelectuales Indígenas y Literaturas en México. El campo literario entre los zapotecas y los mayas

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Luz Maria Lepe Lira

2017-08-01

Full Text Available Este artículo explora la conformación del campo intelectual en la literatura zapoteca del istmo de Tehuantepec y la literatura maya de la Península de Yucatán. A través del concepto de campo intelectual de Pierre Bordieu (2002 y bajo la premisa de que hay tantos campos literarios como literaturas indígenas, se evidencia que estos espacios de poder simbólico están condicionados por elementos socioculturales y políticos que van desde la alfabetización y uso de la escritura en las lenguas indígenas hasta la función de los intelectuales en las redes locales y nacionales. En la literatura zapoteca se indican las estrategias de la generación de Andrés Henestrosa, la relación entre la COCEI y la Casa de Cultura de Juchitán, y los vínculos que sostienen los intelectuales de la región con otros intelectuales de la esfera nacional. Para la literatura maya yucateca se reflexiona sobre la generación de talleres literarios como el principal motor de la nueva literatura maya, tanto desde las instancias gubernamentales como desde las asociaciones civiles y grupos gestionados por los intelectuales mayas. Palabras- clave: intelectuales indígenas, campo intelectual, literatura zapoteca, literatura maya Indigenous Intellectuals and Literatures in Mexico. The Literary Field Between the Zapotecs and the Maya Abstract The present paper explores the conformation of the intellectual field in the Zapotec literature of the Istmhus of Tehuantepec and in the Mayan literature of the Yucatán Peninsula. Through the concept of intellectual field by Pierre Bordieu (2002 and under the premise that there are as many literary fields as indigenous literatures, this paper emphasizes the fact that these spaces of symbolic power and conditioned by sociocultural and political elements ranging from literacy and the use of writing in indigenous languages to the role of intellectuals in local and national networks. In the case of the Zapotec literature the focus lies
Scheduling of hybrid types of machines with two-machine flowshop as the first type and a single machine as the second type

Science.gov (United States)

Hsiao, Ming-Chih; Su, Ling-Huey

2018-02-01

This research addresses the problem of scheduling hybrid machine types, in which one type is a two-machine flowshop and another type is a single machine. A job is either processed on the two-machine flowshop or on the single machine. The objective is to determine a production schedule for all jobs so as to minimize the makespan. The problem is NP-hard since the two parallel machines problem was proved to be NP-hard. Simulated annealing algorithms are developed to solve the problem optimally. A mixed integer programming (MIP) is developed and used to evaluate the performance for two SAs. Computational experiments demonstrate the efficiency of the simulated annealing algorithms, the quality of the simulated annealing algorithms will also be reported.
Incidence and prevalence of systemic sclerosis in Campo Grande, State of Mato Grosso do Sul, Brazil.

Science.gov (United States)

Horimoto, Alex Magno Coelho; Matos, Erica Naomi Naka; Costa, Márcio Reis da; Takahashi, Fernanda; Rezende, Marcelo Cruz; Kanomata, Letícia Barrios; Locatelli, Elisangela Possebon Pradebon; Finotti, Leandro Tavares; Maegawa, Flávia Kamy Maciel; Rondon, Rosa Maria Ribeiro; Machado, Natália Pereira; Couto, Flávia Midori Arakaki Ayres Tavares do; Figueiredo, Túlia Peixoto Alves de; Ovidio, Raphael Antonio; Costa, Izaias Pereira da

Systemic sclerosis is an autoimmune disease which shows extreme heterogeneity in its clinical presentation and that follows a variable and unpredictable course. Although some discrepancies in the incidence and prevalence rates between geographical regions may reflect methodological differences in the definition and verification of cases, they may also reflect true local differences. To determine the prevalence and incidence of systemic sclerosis in the city of Campo Grande, state capital of Mato Grosso do Sul (MS), Brazil, during the period from January to December 2014. All health care services of the city of Campo Grande - MS with attending in the specialty of Rheumatology were invited to participate in the study through a standardized form of clinical and socio-demographic assessment. Physicians of any specialty could report a suspected case of systemic sclerosis, but necessarily the definitive diagnosis should be established by a rheumatologist, in order to warrant the standardization of diagnostic criteria and exclusion of other diseases resembling systemic sclerosis. At the end of the study, 15 rheumatologists reported that they attended patients with systemic sclerosis and sent the completed forms containing epidemiological data of patients. The incidence rate of systemic sclerosis in Campo Grande for the year 2014 was 11.9 per million inhabitants and the prevalence rate was 105.6 per million inhabitants. Systemic sclerosis patients were mostly women, white, with a mean age of 50.58 years, showing the limited form of the disease with a mean duration of the disease of 8.19 years. Regarding laboratory tests, 94.4% were positive for antinuclear antibody, 41.6% for anti-centromere antibody and 19.1% for anti-Scl70; anti-RNA Polymerase III was performed in 37 patients, with 16.2% positive. The city of Campo Grande, the state capital of MS, presented a lower incidence/prevalence of systemic sclerosis in comparison with those numbers found in US studies and close
Optimización global eficiente y efectiva en la inversión de datos de campos potenciales

Directory of Open Access Journals (Sweden)

Pedro G. Junco-Bernázar

2003-03-01

Full Text Available Los problemas inversos de campos potenciales son difíciles de resolver utilizando métodos automáticos, sobre todo por la incapacidad de los procedimientos tradicionales de localizar globalmente el conjunto óptimo de los parámetros. Este artículo establece la naturaleza de los múltiples óptimos locales en la inversión de datos de campos potenciales en un modelo de seis parámetros y analiza la consistencia de tres métodos de optimización global: un método de multicomienzo con el algoritmo Simplex (MSX, un algoritmo genético combinado con el Simplex (GSX y el método de Evolución y Mezcla de Complejos (SCE. Todos los algoritmos fueron capaces de encontrar el conjunto de parámetros óptimos durante el proceso de inversión de campo potencial para un modelo de seis parámetros. En 100 pruebas independientes de cada algoritmo, el procedimiento del SCE se comporta tres veces más eficiente que el procedimiento MSX y dos veces más eficiente que el procedimiento GSX. El método GSX es dos veces más eficiente que el procedimiento MSX.
Machine-to-machine communications architectures, technology, standards, and applications

CERN Document Server

Misic, Vojislav B

2014-01-01

With the number of machine-to-machine (M2M)-enabled devices projected to reach 20 to 50 billion by 2020, there is a critical need to understand the demands imposed by such systems. Machine-to-Machine Communications: Architectures, Technology, Standards, and Applications offers rigorous treatment of the many facets of M2M communication, including its integration with current technology.Presenting the work of a different group of international experts in each chapter, the book begins by supplying an overview of M2M technology. It considers proposed standards, cutting-edge applications, architectures, and traffic modeling and includes case studies that highlight the differences between traditional and M2M communications technology.Details a practical scheme for the forward error correction code designInvestigates the effectiveness of the IEEE 802.15.4 low data rate wireless personal area network standard for use in M2M communicationsIdentifies algorithms that will ensure functionality, performance, reliability, ...
Nonplanar machines

International Nuclear Information System (INIS)

Ritson, D.

1989-05-01

This talk examines methods available to minimize, but never entirely eliminate, degradation of machine performance caused by terrain following. Breaking of planar machine symmetry for engineering convenience and/or monetary savings must be balanced against small performance degradation, and can only be decided on a case-by-case basis. 5 refs
Ultraprecision machining. Cho seimitsu kako

Energy Technology Data Exchange (ETDEWEB)

Suga, T [The Univ. of Tokyo, Tokyo (Japan). Research Center for Advanced Science and Technology

1992-10-05

It is said that the image of ultraprecision improved from 0.1[mu]m to 0.01[mu]m within recent years. Ultraprecision machining is a production technology which forms what is called nanotechnology with ultraprecision measuring and ultraprecision control. Accuracy means average machined sizes close to a required value, namely the deflection errors are small; precision means the scattered errors of machined sizes agree very closely. The errors of machining are related to both of the above errors and ultraprecision means the combined errors are very small. In the present ultraprecision machining, the relative precision to the size of a machined object is said to be in the order of 10[sup -6]. The flatness of silicon wafers is usually less than 0.5[mu]m. It is the fact that the appearance of atomic scale machining is awaited as the limit of ultraprecision machining. The machining of removing and adding atomic units using scanning probe microscopes are expected to reach the limit actually. 2 refs.
Fisica del nucleo stelle di neutroni

CERN Document Server

Bernardini, Carlo

1982-01-01

Studio sistematico delle masse nucleari ; energia di legame ; raggi nucleari dai nuclei speculari ; il nucleo in approssimazione di Thomas-Fermi ; introduzione allo scattering : caratterizzazione cinematica degli urti ; la sezione d'urto ; il fattore di forma dei nuclei ; gli atomi u-mesici ; proprieta elettromagnetiche statiche dei nuclei (momenti di multipolo) ; momento di quadrupolo elettrico dei nuclei ; momento d dipolo magnetico dei nuclei ; metodo delle risonanze magnetiche nucleari (NMR) ; misura del fattore giromagnetico e del momento di quadrupolo ; modelli nucleari a particelle indipendenti, il modello a shell ; l'interazione spin-orbita ; il modello a shell e le linee di Schmidt per il momento magnetico dei nuclei con "A" dispari ; nuclei non sferici (deformati) ; stelle di neutroni.
Theory and practice in machining systems

CERN Document Server

Ito, Yoshimi

2017-01-01

This book describes machining technology from a wider perspective by considering it within the machining space. Machining technology is one of the metal removal activities that occur at the machining point within the machining space. The machining space consists of structural configuration entities, e.g., the main spindle, the turret head and attachments such the chuck and mandrel, and also the form-generating movement of the machine tool itself. The book describes fundamental topics, including the form-generating movement of the machine tool and the important roles of the attachments, before moving on to consider the supply of raw materials into the machining space, and the discharge of swarf from it, and then machining technology itself. Building on the latest research findings “Theory and Practice in Machining System” discusses current challenges in machining. Thus, with the inclusion of introductory and advanced topics, the book can be used as a guide and survey of machining technology for students an...
Pesquisa de campo em psicologia social: uma perspectiva pós-construcionista Field research social psychology: a post-construcionist perspective

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Peter Kevin Spink

2003-12-01

Full Text Available O termo ''pesquisa de campo'' é normalmente empregado na Psicologia Social para descrever um tipo de pesquisa feito nos lugares da vida cotidiana e fora do laboratório ou da sala de entrevista. Nesta ótica, o pesquisador ou pesquisadora vai ao campo para coletar dados que serão depois analisados utilizando uma variedade de métodos tanto para a coleta quanto para a análise. Neste texto, relatamos as conclusões iniciais de uma série de discussões sobre pesquisas de campo feita numa perspectiva pós-construcionista. Partindo das dificuldades provocadas por uma noção de campo fisicamente determinada, a discussão retoma a perspectiva de Kurt Lewin sobre o campo como totalidade de fatos psicológicos, para depois se aproximar das propostas de Ian Hacking sobre ''matriz'' e a discussão mais ampla sobre materialidades. A conseqüência desta reflexão foi a proposição de um ''campo-tema'' onde o campo não é mais um lugar específico, mas se refere à processualidade de temas situados. O texto conclui com uma discussão sobre algumas implicações desta proposta para o processo de pesquisa e para as práticas narrativas usadas para relatar as suas conclusões.The expression ''field research'' is normally used in social psychology to describe a type of research that is carried out outside the laboratory and in the places where everyday action takes place. In this approach, the researcher will go ''to the field'' in order to collect data that will later be analyzed and in order to do this a variety of different methods will be used, both to gather the data and to examine it. This paper reports on the initial conclusions from a series of discussions held on field research, taking as a starting point a post-constructionist perspective. Beginning with the difficulties created by the notion of ''field'' as physically determined and separate, the debate moved on to consider the arguments of Kurt Lewin in favor of a notion of psychological field
Conservación y gestión del paisaje en el Campo de Albacete = Landscape conservation and management in the Campo de Albacete

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José Luis Rodríguez García

2015-10-01

Full Text Available El artículo toma como base el territorio del Campo de Albacete, espacio donde se hace notar la influencia de la capital albaceteña en las poblaciones vecinas. La rica variedad paisajística que atesora necesita una intensa gestión de conservación para su puesta en valor como recurso imprescindible. Las diferentes encuestas entre población y visitantes, nos han proporcionado un pormenorizado análisis a escala local, a su vez compaginado con el trabajo de campo, por lo que hemos podido contrastar la percepción que de su paisaje tienen tanto los propios residentes como los agentes sociales de los aspectos y realidades de los distintos paisajes del territorio analizado. Si evaluamos los rasgos que identifican a este paisaje, fuertemente ligado al modo de vida de las personas que lo habitan, está llamado a una rápida desaparición ante los constantes cambios desarrollados en estas últimas décadas, por lo que su protección es necesaria y debe estar lo suficientemente reflejada en los documentos base para su buena gestión. Consideramos factores fundamentales para la gestión efectiva del paisaje en el territorio las llamadas Agendas 21, la importancia patrimonial de la ciudad de Chinchilla y el desarrollo turístico.The article takes as starting point the territory of the Campo de Albacete, an area where the influence of the capital city in the surrounding towns is stated. The wide landscape variety that amasses needs a powerful preservation management in order to highlight it as an essential resource. The different surveys carried out among the population and the visitors have provided a detailed analysis at a local level, combined at the same time with the field work; being able to check the perception, on the one hand, of the population, and on the other hand, of the social factors of the different aspects and realities of the different landscapes of analysed territory. If we assess the characteristics of this
GEOMORFOLOGIA DO CAMPO DE INSELBERGUES DE QUIXADÁ, NORDESTE DO BRASIL

Directory of Open Access Journals (Sweden)

Rúbson Pinheiro Maia

2015-06-01

Full Text Available Ao norte do Maciço da Borborema, no Nordeste Brasileiro, vários campos de inselbergues caracterizam as depressões sertanejas. Esses relevos ocorrem principalmente em áreas de intrusões graníticas que atualmente estão sendo exumadas pela erosão diferencial. Em Quixadá, no estado do Ceará, ocorre um dos mais representativos campo de inselbergues do Brasil. Trata-se de diversas massas rochosas em geral côncavo-convexas ou fraturadas, formada pela exposição subaérea de um batólito granítico. Nesse trabalho, individualizamos as diversas formas de inselbergues agrupando-as segundo seus padrões morfológicos. Esses padrões foram correlacionados com as fáceis do granito e com a densidade de fraturamento. Observamos que as fáceis porfiríticas ricas em fenocristais de feldspato originaram inselbergues com feições de dissolução do tipo caneluras e vasques, enquanto as fáceis caracterizadas pela presença de diques e enclaves máficos originaram inselbergues caracterizados por feições de fraturamento do tipo taffonis de colapso. Essa correlação nos permitiu concluir que mesmo dentro de uma mesma unidade litológica como o granitoide, as variações faciológicas internas podem resultar em feições distintas de acordo com as características mineralógicas e texturais da rocha e do fraturamento.
Face machines

Energy Technology Data Exchange (ETDEWEB)

Hindle, D.

1999-06-01

The article surveys latest equipment available from the world`s manufacturers of a range of machines for tunnelling. These are grouped under headings: excavators; impact hammers; road headers; and shields and tunnel boring machines. Products of thirty manufacturers are referred to. Addresses and fax numbers of companies are supplied. 5 tabs., 13 photos.

Accelerated aging and seedling field emergence in soybean Envelhecimento acelerado e emergência de plântulas de soja em campo

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Reynaldo Melo Torres

2004-10-01

Full Text Available Information regarding the relationship between laboratory seed vigor testing and seedling field emergence is very important to estimate seed performance after sowing and help producers adopt the best procedures to improve stand establishment. The objective of the present study was to relate accelerated aging (AA test results to soybean [Glycine max (L. Merrill] seedling field emergence results based on data obtained over three agricultural years. The following evaluations were made: seed water content, standard germination, accelerated aging, electrical conductivity, and seedling field emergence. There was a close association between planting environmental conditions, seed physiological quality and seedling field emergence. The most accurate predictions were obtained for AA values > 90%, when field emergence was higher than 80% (r² = 0.90. Based on the results it was concluded that the AA test provided an accurate estimate of field emergence of soybean seedlings. However, as seedbed environmental conditions became less favorable, the ability of the AA test to estimate field performance significantly decreased.Informações sobre a relação entre resultados de testes de vigor conduzidos em laboratório e da emergência de plântulas em campo são fundamentais para a tomada de decisões pelos produtores de sementes. O presente trabalho teve por objetivo verificar a associação entre os resultados do teste de envelhecimento acelerado e a emergência de plântulas de soja [Glycine max (L. Merrill] em campo, em diferentes safras agrícolas e épocas de semeadura. Assim, foram efetuadas as seguintes avaliações: determinação do grau de umidade das sementes; testes de germinação, de envelhecimento acelerado e de condutividade elétrica, bem como emergência de plântulas em campo. A estimativa mais precisa do desempenho das plântulas em campo foi verificada numa faixa de valores de envelhecimento acelerado > 90%, estimando emergência em campo
Tattoo machines, needles and utilities.

Science.gov (United States)

Rosenkilde, Frank

2015-01-01

Starting out as a professional tattooist back in 1977 in Copenhagen, Denmark, Frank Rosenkilde has personally experienced the remarkable development of tattoo machines, needles and utilities: all the way from home-made equipment to industrial products of substantially improved quality. Machines can be constructed like the traditional dual-coil and single-coil machines or can be e-coil, rotary and hybrid machines, with the more convenient and precise rotary machines being the recent trend. This development has resulted in disposable needles and utilities. Newer machines are more easily kept clean and protected with foil to prevent crosscontaminations and infections. The machines and the tattooists' knowledge and awareness about prevention of infection have developed hand-in-hand. For decades, Frank Rosenkilde has been collecting tattoo machines. Part of his collection is presented here, supplemented by his personal notes. © 2015 S. Karger AG, Basel.
Design of rotating electrical machines

CERN Document Server

Pyrhonen , Juha; Hrabovcova , Valeria

2013-01-01

In one complete volume, this essential reference presents an in-depth overview of the theoretical principles and techniques of electrical machine design. This timely new edition offers up-to-date theory and guidelines for the design of electrical machines, taking into account recent advances in permanent magnet machines as well as synchronous reluctance machines. New coverage includes: Brand new material on the ecological impact of the motors, covering the eco-design principles of rotating electrical machinesAn expanded section on the design of permanent magnet synchronous machines, now repo
Para além do "trabalho de campo": reflexões supostamente malinowskianas

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Giumbelli Emerson

2002-01-01

Full Text Available O trabalho propõe uma releitura, confessadamente interessada e irônica, dos célebres esclarecimentos prestados por Malinowski no capítulo de abertura dos Argonautas do pacífico ocidental. Nesse texto, Malinowski expõe suas justificativas para o tipo de aproximação que realizou para estudar uma população melanésia da década de 1910, aproximação desde então consagrada na antropologia mediante a idéia de "trabalho de campo". Pretendo, de minha parte, demonstrar que as mesmas justificativas, colocadas dentro dos quadros propiciados por objetos bem diversos, podem fundamentar uma outra aproximação metodológica. Nesse sentido, continuar "fiel" a Malinowski significa relê-lo (e mesmo subvertê-lo de forma a explorar certas virtualidades de seu texto, acionadas com base em situações de pesquisa com que os antropólogos se deparam atualmente, permitindo adequar à disciplina metodologias que não se definem estritamente como "trabalho de campo". Essas reflexões assentam-se sobre uma trajetória pessoal caracterizada exatamente por pesquisas que privilegiaram materiais arquivísticos e fontes textuais.
EL TRABAJO DE CAMPO EN ESTUDIOS SOBRE EDUCACIÓN: CUANDO LOS INVESTIGADORES ENFRENTAN LA REALIDAD

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Silvia Patricia Aquino Zúñiga

2010-01-01

Full Text Available El propósito de este artículo es dar a conocer el significado de experiencias concretas de investigación tienen en la formación de estudiantes universitarios como investigadores. Los hallazgos que aquí se presentan se ubican dentro de un proyecto titulado: Evaluar para mejorar: Sistema de evaluación educativa para escuelas de bajo logro académico, el cual fue auspiciado por el Fondo Mixto de Fomento a la Investigación Científica y Tecnológica CONACYT ¿ Gobierno del Estado de Tabasco, en México. A lo largo de seis semanas, 30 asistentes de investigación, estudiantes de pregrado, agrupados en 10 grupos, visitaron 105 escuelas del estado de Tabasco, para aplicar cuestionarios a directores, profesores, padres de familia y estudiantes, así como exámenes para evaluar el desempeño académico de estos últimos. A través de entrevistas cualitativas enfocadas a los asistentes de investigación, se registraron sus experiencias en la realización del trabajo de campo. Los resultados indican que la experiencia favoreció aspectos formativos en investigación en los estudiantes y proporcionó a los investigadores responsables elementos para mejorar la planificación del trabajo de campo en proyectos futuros. Se concluye que involucrar a estudiantes de pregrado en trabajos de campo en proyectos de investigación resulta enriquecedor tanto para el estudiantado como para las personas responsables del proyecto.
Arte y trabajo: una aproximación conceptual a la relación del arte con otros campos del espacio social

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Ivonne Paola Mendoza Niño

2011-09-01

Full Text Available El presente artículo forma parte del ejercicio de socialización de la tesis de maestría de la autora, que busca abordar conceptualmente, desde las ciencias sociales, las relaciones del campo del arte con otros campos del espacio social, sobre todo con las dinámicas educativas y laborales. El texto está compuesto por tres momentos: la caracterización del campo del arte; la relación entre arte, educación, trabajo, profesión y empleo; y un primer acercamiento a la actividad de actores y actrices. El trabajo se centra en una revisión del estado actual de los temas mencionados, y unas primeras reflexiones que pretenden abrir el camino de una investigación empírica a profundidad referida a las trayectorias educativas y laborales de los actores y actrices de Bogotá (Colombia.
Las prácticas de campo en la construcción del conocimiento profesional de futuros profesores de Biología

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Elías Amórtegui Cedeño

2009-07-01

Full Text Available El presente escrito muestra el trabajo de práctica pedagógica I y II desarrollado al interior del Grupo de Investigación Conocimiento Profesional del Profesor de Ciencias, en la Universidad Pedagógica Nacional (UPN durante el 2007-2008 con estudiantes de sexto semestre de Licenciatura en Biología, con el fin de contribuir a la construcción del Conocimiento Profesional del Profesor de Biología, a través de las prácticas de campo como estrategia en la enseñanza de la biología. En un primer acercamiento, se indagó las concepciones de los estudiantes acerca de la relación entre las prácticas de campo y el Conocimiento Profesional del Profesor de Biología, evidenciando que consideraban la importancia de éstas, únicamente, a partir de su rol como aprendices y su incidencia en la construcción del Conocimiento Biológico, sin tener en cuenta la importancia de éstas en su quehacer como docentes. En este sentido, como contenido formativo favorecer en los estudiantes de sexto semestre, la práctica de campo como una estrategia en la enseñanza de la biología, para esto se plantearon talleres, reflexiones y un espacio en el cual los futuros profesores diseñaron una práctica de campo para alumnos de segundo grado de educación básica de una Institución Educativa Distrital. Dichos espacios y reflexiones permitieron a los futuros maestros, considerar la práctica de campo como una estrategia en la enseñanza de la biología la cual aporta a la construcción de un Conocimiento propio del profesor de biología
VIRTUAL MODELING OF A NUMERICAL CONTROL MACHINE TOOL USED FOR COMPLEX MACHINING OPERATIONS

Directory of Open Access Journals (Sweden)

POPESCU Adrian

2015-11-01

Full Text Available This paper presents the 3D virtual model of the numerical control machine Modustar 100, in terms of machine elements. This is a CNC machine of modular construction, all components allowing the assembly in various configurations. The paper focused on the design of the subassemblies specific to the axes numerically controlled by means of CATIA v5, which contained different drive kinematic chains of different translation modules that ensures translation on X, Y and Z axis. Machine tool development for high speed and highly precise cutting demands employment of advanced simulation techniques witch it reflect on cost of total development of the machine.
MITS machine operations

International Nuclear Information System (INIS)

Flinchem, J.

1980-01-01

This document contains procedures which apply to operations performed on individual P-1c machines in the Machine Interface Test System (MITS) at AiResearch Manufacturing Company's Torrance, California Facility
Coordinate measuring machines

DEFF Research Database (Denmark)

De Chiffre, Leonardo

This document is used in connection with three exercises of 2 hours duration as a part of the course GEOMETRICAL METROLOGY AND MACHINE TESTING. The exercises concern three aspects of coordinate measuring: 1) Measuring and verification of tolerances on coordinate measuring machines, 2) Traceabilit...... and uncertainty during coordinate measurements, 3) Digitalisation and Reverse Engineering. This document contains a short description of each step in the exercise and schemes with room for taking notes of the results.......This document is used in connection with three exercises of 2 hours duration as a part of the course GEOMETRICAL METROLOGY AND MACHINE TESTING. The exercises concern three aspects of coordinate measuring: 1) Measuring and verification of tolerances on coordinate measuring machines, 2) Traceability...
Analysis of the influence of the Colatina Belt in the Campos and Espirito Santo Basins-Brazil; Analise da influencia da Faixa Colatina nas Bacias de Campos e Espirito Santo

Energy Technology Data Exchange (ETDEWEB)

Silva, Gustavo Henrique Teixeira da; Simoes, Luiz Sergio Amarante; Souza, Iata Anderson de [Universidade Estadual Paulista (UNESP), Rio Claro, SP (Brazil). Inst. de Geociencias e Ciencias Exatas

2008-07-01

Recent discoveries in the Espirito Santo Basin confirm the importance of it in the national exploratory scenery (oil and gas production). The new fields like Carapo and Camarupim, beyond others, next to already known Golfinho and Canapu, totalize an addition of 560 million barrels. In this way, studies in the area add importance, as the case of the present research, where if it looked to analyze the influence of Colatina Belt in Espirito Santo Basin and secondarily in Campos Basin. The results had been gotten through the integration of diverse data, such as lineaments extracted from images SRTM, potential maps and analyze of seismic lines. It was concluded that the Colatina Belt if projects for the interior of the basins, but that the same one seems to be dislocated in relation to the direct projection of the continental features, being that its influence can be felt with bigger emphasis in the Campos Basin, while in the Espirito Santo it look like to have low importance with regard to the exploration aspects. Also it was verified the presence of numerous halo kinetic structures that affect all the mapped horizons, this element determine great importance in the generation of structural traps. (author)
Electric machine

Science.gov (United States)

El-Refaie, Ayman Mohamed Fawzi [Niskayuna, NY; Reddy, Patel Bhageerath [Madison, WI

2012-07-17

An interior permanent magnet electric machine is disclosed. The interior permanent magnet electric machine comprises a rotor comprising a plurality of radially placed magnets each having a proximal end and a distal end, wherein each magnet comprises a plurality of magnetic segments and at least one magnetic segment towards the distal end comprises a high resistivity magnetic material.
Machine Learning and Radiology

Science.gov (United States)

Wang, Shijun; Summers, Ronald M.

2012-01-01

In this paper, we give a short introduction to machine learning and survey its applications in radiology. We focused on six categories of applications in radiology: medical image segmentation, registration, computer aided detection and diagnosis, brain function or activity analysis and neurological disease diagnosis from fMR images, content-based image retrieval systems for CT or MRI images, and text analysis of radiology reports using natural language processing (NLP) and natural language understanding (NLU). This survey shows that machine learning plays a key role in many radiology applications. Machine learning identifies complex patterns automatically and helps radiologists make intelligent decisions on radiology data such as conventional radiographs, CT, MRI, and PET images and radiology reports. In many applications, the performance of machine learning-based automatic detection and diagnosis systems has shown to be comparable to that of a well-trained and experienced radiologist. Technology development in machine learning and radiology will benefit from each other in the long run. Key contributions and common characteristics of machine learning techniques in radiology are discussed. We also discuss the problem of translating machine learning applications to the radiology clinical setting, including advantages and potential barriers. PMID:22465077
Tribology in machine design

CERN Document Server

Stolarski, Tadeusz

1999-01-01

""Tribology in Machine Design is strongly recommended for machine designers, and engineers and scientists interested in tribology. It should be in the engineering library of companies producing mechanical equipment.""Applied Mechanics ReviewTribology in Machine Design explains the role of tribology in the design of machine elements. It shows how algorithms developed from the basic principles of tribology can be used in a range of practical applications within mechanical devices and systems.The computer offers today's designer the possibility of greater stringen
Quadrilateral Micro-Hole Array Machining on Invar Thin Film: Wet Etching and Electrochemical Fusion Machining

Directory of Open Access Journals (Sweden)

Woong-Kirl Choi

2018-01-01

Full Text Available Ultra-precision products which contain a micro-hole array have recently shown remarkable demand growth in many fields, especially in the semiconductor and display industries. Photoresist etching and electrochemical machining are widely known as precision methods for machining micro-holes with no residual stress and lower surface roughness on the fabricated products. The Invar shadow masks used for organic light-emitting diodes (OLEDs contain numerous micro-holes and are currently machined by a photoresist etching method. However, this method has several problems, such as uncontrollable hole machining accuracy, non-etched areas, and overcutting. To solve these problems, a machining method that combines photoresist etching and electrochemical machining can be applied. In this study, negative photoresist with a quadrilateral hole array pattern was dry coated onto 30-µm-thick Invar thin film, and then exposure and development were carried out. After that, photoresist single-side wet etching and a fusion method of wet etching-electrochemical machining were used to machine micro-holes on the Invar. The hole machining geometry, surface quality, and overcutting characteristics of the methods were studied. Wet etching and electrochemical fusion machining can improve the accuracy and surface quality. The overcutting phenomenon can also be controlled by the fusion machining. Experimental results show that the proposed method is promising for the fabrication of Invar film shadow masks.
A Universal Reactive Machine

DEFF Research Database (Denmark)

Andersen, Henrik Reif; Mørk, Simon; Sørensen, Morten U.

1997-01-01

Turing showed the existence of a model universal for the set of Turing machines in the sense that given an encoding of any Turing machine asinput the universal Turing machine simulates it. We introduce the concept of universality for reactive systems and construct a CCS processuniversal...
Consequences of heavy machining vis à vis the machine structure – typical applications

International Nuclear Information System (INIS)

Leuch, M

2011-01-01

StarragHeckert has built 5 axis machines since the middle of the 80s for heavy duty milling. The STC-Centres are predominantly utilised in the aerospace industry, especially for milling structural workpieces, casings or Impellers made out of titanium and steel. StarragHeckert has a history of building machines for high performance milling. The machining of these components includes high forces thus spreading the wheat from the chaff. Although FEM calculations and multi-body simulations are carried out in the early stages of development, this paper will illustrate how the real process stability with modal analysis and cutting trials is determined. The experiment observes chatter stability to identify if the machine devices are adequate for the application or if the design has to be improved. Machining parameters of industrial applications are demonstrating the process stability for five axis heavy duties milling of StarragHeckert machine.
Consolidación del campo teatral bogotano. Del Movimiento Nuevo Teatro al teatro contemporáneo

Directory of Open Access Journals (Sweden)

Janeth Aldana

2008-01-01

trabajo de investigación sobre la consolidación y emergencia del campo teatral bogotano. Aquí se explora particularmente la incidencia del denominado Movimiento Nuevo Teatro, el cual se desarrolló en América Latina desde los años cincuenta hasta los años setenta del siglo pasado. En Colombia, éste va a cobrar singular importancia generando, aun hoy, álgidos debates sobre el verdadero papel de la creación colectiva y la organización en grupos en cuanto a la transformación de la dramaturgia, y la actividad teatral en el país. Tales debates se toman aquí como otro dato más, junto con el discurso de los demás agentes pertenecientes al campo a través de los libros de historia sobre el teatro colombiano y los textos teóricos de varios de sus protagonistas. La información se complementa con la suministrada por revistas especializadas y por las instituciones oficiales encargadas del área de cultura. Al final, una de las conclusiones centrales es que se puede hablar de un campo teatral en Bogotá gracias a la autonomía suficiente que se obtuvo por tres búsquedas puntuales: la adquisición de una sala propia, la formación del público y la creación de una dramaturgia nacional.
Virtual Machine in Automation Projects

OpenAIRE

Xing, Xiaoyuan

2010-01-01

Virtual machine, as an engineering tool, has recently been introduced into automation projects in Tetra Pak Processing System AB. The goal of this paper is to examine how to better utilize virtual machine for the automation projects. This paper designs different project scenarios using virtual machine. It analyzes installability, performance and stability of virtual machine from the test results. Technical solutions concerning virtual machine are discussed such as the conversion with physical...
El concilio Vaticano II y su impacto en el campo episcopal argentino The Second Vatican Council and its impact on argentinian Episcopal field

Directory of Open Access Journals (Sweden)

Paulo Margaria

2012-06-01

Full Text Available El presente artículo busca explorar el impacto que tuvo el Concilio Vaticano II en la Iglesia Católica Argentina, haciendo especial hincapié en el campo de los obispos, desde una perspectiva socio-religiosa que pretende dar cuenta de la complejidad del campo católico. Para ello nos parece adecuado utilizar la noción de "campo" en términos bourdianos. Consideramos que hablar de "campo religioso" nos permite concebir el catolicismo como un espacio social dinámico y atravesado por constantes conflictos y luchas llevadas a cabo por grupos de agentes que intentan dominar dicho campo. Esto nos permitirá caracterizar las diversas posturas que el Concilio acentuará en el catolicismo argentino, actuando de este modo como un propulsor y legitimador de reflexiones y conflictos que existían previamente.This article examines the impact that Second Vatican Council had on argentinian Catholic Church, with special emphasis on the Bishops field, from a socio-religious perspective that seeks to explain the complexity of Catholic field. Therefore, it seems appropriate to use the Pierre Bourdieu's notion of "field". We believe that talk about "religious field" allows us to conceive Catholicism as a dynamic social space spanned by constant conflicts and struggles carried out by groups of agents who tried to dominate the field. Again, this allows us to characterize the positions that the Council emphasized in the Argentine Catholicism, acting as a propellant and legitimizing ideas and conflicts that existed previously.

The Buttonhole Machine. Module 13.

Science.gov (United States)

South Carolina State Dept. of Education, Columbia. Office of Vocational Education.

This module on the bottonhole machine, one in a series dealing with industrial sewing machines, their attachments, and operation, covers two topics: performing special operations on the buttonhole machine (parts and purpose) and performing special operations on the buttonhole machine (gauged buttonholes). For each topic these components are…
Introduction to machine learning.

Science.gov (United States)

Baştanlar, Yalin; Ozuysal, Mustafa

2014-01-01

The machine learning field, which can be briefly defined as enabling computers make successful predictions using past experiences, has exhibited an impressive development recently with the help of the rapid increase in the storage capacity and processing power of computers. Together with many other disciplines, machine learning methods have been widely employed in bioinformatics. The difficulties and cost of biological analyses have led to the development of sophisticated machine learning approaches for this application area. In this chapter, we first review the fundamental concepts of machine learning such as feature assessment, unsupervised versus supervised learning and types of classification. Then, we point out the main issues of designing machine learning experiments and their performance evaluation. Finally, we introduce some supervised learning methods.
Applied machining technology

CERN Document Server

Tschätsch, Heinz

2010-01-01

Machining and cutting technologies are still crucial for many manufacturing processes. This reference presents all important machining processes in a comprehensive and coherent way. It includes many examples of concrete calculations, problems and solutions.
Estudio de la eficiencia operativa de las bombas eléctricas sumergibles (bes) en el campo vhr en base a las curvas de operación

OpenAIRE

Ruiz, Christian; Roman, Hector

2009-01-01

Dada la gran necesidad de incrementar la producción en el distrito Amazónico, se propuso realizar un estudio de la eficiencia operativa de las bombas electrosumergible en el campo, en el cual se recopila toda la información relacionada con las bombas del campo, análisis de la información y determinación de posibles soluciones a las deficiencias operativas que permitan optimizar el proceso y obtener mayor producción de petróleo en el campo, que será de gran beneficio para la empresa y el país ...
WRITTEN THAT CONVERGE: A POETIC RESONANCE BETWEEN HAROLDO DE CAMPOS AND HERBERTO HELDER

Directory of Open Access Journals (Sweden)

Geovanna Marcela da Silva Guimarães

2015-08-01

Full Text Available The objective of this work, based on readings of O grau zero da escrita (2000 by Roland Barthes, O trabalho da citação (2013 by Antoine Compagnon and on the critical fortune about the poetic works of Haroldo de Campos and Herberto Helder, is to demonstrate how the poetic writings of these authors poetically and historically converge between them.
Machine Learning

Energy Technology Data Exchange (ETDEWEB)

Chikkagoudar, Satish; Chatterjee, Samrat; Thomas, Dennis G.; Carroll, Thomas E.; Muller, George

2017-04-21

The absence of a robust and unified theory of cyber dynamics presents challenges and opportunities for using machine learning based data-driven approaches to further the understanding of the behavior of such complex systems. Analysts can also use machine learning approaches to gain operational insights. In order to be operationally beneficial, cybersecurity machine learning based models need to have the ability to: (1) represent a real-world system, (2) infer system properties, and (3) learn and adapt based on expert knowledge and observations. Probabilistic models and Probabilistic graphical models provide these necessary properties and are further explored in this chapter. Bayesian Networks and Hidden Markov Models are introduced as an example of a widely used data driven classification/modeling strategy.
Machine Protection

International Nuclear Information System (INIS)

Zerlauth, Markus; Schmidt, Rüdiger; Wenninger, Jörg

2012-01-01

The present architecture of the machine protection system is being recalled and the performance of the associated systems during the 2011 run will be briefly summarized. An analysis of the causes of beam dumps as well as an assessment of the dependability of the machine protection systems (MPS) itself is being presented. Emphasis will be given to events that risked exposing parts of the machine to damage. Further improvements and mitigations of potential holes in the protection systems will be evaluated along with their impact on the 2012 run. The role of rMPP during the various operational phases (commissioning, intensity ramp up, MDs...) will be discussed along with a proposal for the intensity ramp up for the start of beam operation in 2012
Machine Protection

Energy Technology Data Exchange (ETDEWEB)

Zerlauth, Markus; Schmidt, Rüdiger; Wenninger, Jörg [European Organization for Nuclear Research, Geneva (Switzerland)

2012-07-01

The present architecture of the machine protection system is being recalled and the performance of the associated systems during the 2011 run will be briefly summarized. An analysis of the causes of beam dumps as well as an assessment of the dependability of the machine protection systems (MPS) itself is being presented. Emphasis will be given to events that risked exposing parts of the machine to damage. Further improvements and mitigations of potential holes in the protection systems will be evaluated along with their impact on the 2012 run. The role of rMPP during the various operational phases (commissioning, intensity ramp up, MDs...) will be discussed along with a proposal for the intensity ramp up for the start of beam operation in 2012.
Machine Protection

CERN Document Server

Zerlauth, Markus; Wenninger, Jörg

2012-01-01

The present architecture of the machine protection system is being recalled and the performance of the associated systems during the 2011 run will be briefly summarized. An analysis of the causes of beam dumps as well as an assessment of the dependability of the machine protection systems (MPS) itself is being presented. Emphasis will be given to events that risked exposing parts of the machine to damage. Further improvements and mitigations of potential holes in the protection systems will be evaluated along with their impact on the 2012 run. The role of rMPP during the various operational phases (commissioning, intensity ramp up, MDs...) will be discussed along with a proposal for the intensity ramp up for the start of beam operation in 2012.
Dictionary of machine terms

International Nuclear Information System (INIS)

1990-06-01

This book has introduction of dictionary of machine terms, and a compilation committee and introductory remarks. It gives descriptions of the machine terms in alphabetical order from a to Z and also includes abbreviation of machine terms and symbol table, way to read mathematical symbols and abbreviation and terms of drawings.
HTS machine laboratory prototype

DEFF Research Database (Denmark)

machine. The machine comprises six stationary HTS field windings wound from both YBCO and BiSCOO tape operated at liquid nitrogen temperature and enclosed in a cryostat, and a three phase armature winding spinning at up to 300 rpm. This design has full functionality of HTS synchronous machines. The design...
Probability Machines: Consistent Probability Estimation Using Nonparametric Learning Machines

Science.gov (United States)

Malley, J. D.; Kruppa, J.; Dasgupta, A.; Malley, K. G.; Ziegler, A.

2011-01-01

Summary Background Most machine learning approaches only provide a classification for binary responses. However, probabilities are required for risk estimation using individual patient characteristics. It has been shown recently that every statistical learning machine known to be consistent for a nonparametric regression problem is a probability machine that is provably consistent for this estimation problem. Objectives The aim of this paper is to show how random forests and nearest neighbors can be used for consistent estimation of individual probabilities. Methods Two random forest algorithms and two nearest neighbor algorithms are described in detail for estimation of individual probabilities. We discuss the consistency of random forests, nearest neighbors and other learning machines in detail. We conduct a simulation study to illustrate the validity of the methods. We exemplify the algorithms by analyzing two well-known data sets on the diagnosis of appendicitis and the diagnosis of diabetes in Pima Indians. Results Simulations demonstrate the validity of the method. With the real data application, we show the accuracy and practicality of this approach. We provide sample code from R packages in which the probability estimation is already available. This means that all calculations can be performed using existing software. Conclusions Random forest algorithms as well as nearest neighbor approaches are valid machine learning methods for estimating individual probabilities for binary responses. Freely available implementations are available in R and may be used for applications. PMID:21915433
Sustentabilidade e Gestão de Empreendimentos Hoteleiros: Analisando Hotéis de Campo Grande, Mato Grosso do Sul

Directory of Open Access Journals (Sweden)

Maria Claudia Mancuelho Malta

2015-10-01

Full Text Available O presente artigo propõe-se a analisar a gestão de empreendimentos hoteleiros sediados na cidade de Campo Grande, MS, a partir dos princípios da sustentabilidade, nas suas dimensões econômica, social e ambiental. Para tanto, foi proposta uma pesquisa exploratória, de abordagem qualitativa, em forma de estudo de caso, com entrevistas semiestruturadas aos gerentes de seis hotéis do município em análise. Constatou-se que a sustentabilidade nos hotéis investigados encontra-se em estado inicial, sobretudo por conta da falta de informações acerca de seus aspectos constitutivos. Ademais, os maiores níveis de ações sustentáveis são evidenciados em hotéis pertencentes a grandes redes. Logo, sugere-se o acirramento da difusão do conceito; bem como o efetivo incentivo para sua implantação como método de gestão organizacional – contribuindo no estímulo ao estabelecimento de relações harmoniosas entre as diversas atividades econômicas, o ambiente, a cultura e as especificidades socioespaciais dos territórios. Palavras-chave: Turismo. Empreendimentos hoteleiros. Sustentabilidade. Campo Grande, MS. Sustainability Principles and Hotel Enterprises Management: Analyzing Hotels in Campo Grande, Mato Grosso do Sul, Brazil - This paper proposes to analyze hotels management in Campo Grande, MS, considering the principles of sustainability in its economic, social and environmental dimensions. The research proposed presents an exploratory and qualitative approach, in the form of case study, with semi-structured interviews to managers of six hotels in the city in question. The interviews were transcribed and analyzed through content analysis. It was found that sustainability in the hotels is still in an initial state, mainly due to the lack of information about its constituent aspects. Moreover, it was noted that higher levels of sustainable actions are observed in hotels belonging to hotel networks. Thus, it is suggested the
National machine guarding program: Part 1. Machine safeguarding practices in small metal fabrication businesses

OpenAIRE

Parker, David L.; Yamin, Samuel C.; Brosseau, Lisa M.; Xi, Min; Gordon, Robert; Most, Ivan G.; Stanley, Rodney

2015-01-01

Background Metal fabrication workers experience high rates of traumatic occupational injuries. Machine operators in particular face high risks, often stemming from the absence or improper use of machine safeguarding or the failure to implement lockout procedures. Methods The National Machine Guarding Program (NMGP) was a translational research initiative implemented in conjunction with two workers' compensation insures. Insurance safety consultants trained in machine guarding used standardize...
Machine vision systems using machine learning for industrial product inspection

Science.gov (United States)

Lu, Yi; Chen, Tie Q.; Chen, Jie; Zhang, Jian; Tisler, Anthony

2002-02-01

Machine vision inspection requires efficient processing time and accurate results. In this paper, we present a machine vision inspection architecture, SMV (Smart Machine Vision). SMV decomposes a machine vision inspection problem into two stages, Learning Inspection Features (LIF), and On-Line Inspection (OLI). The LIF is designed to learn visual inspection features from design data and/or from inspection products. During the OLI stage, the inspection system uses the knowledge learnt by the LIF component to inspect the visual features of products. In this paper we will present two machine vision inspection systems developed under the SMV architecture for two different types of products, Printed Circuit Board (PCB) and Vacuum Florescent Displaying (VFD) boards. In the VFD board inspection system, the LIF component learns inspection features from a VFD board and its displaying patterns. In the PCB board inspection system, the LIF learns the inspection features from the CAD file of a PCB board. In both systems, the LIF component also incorporates interactive learning to make the inspection system more powerful and efficient. The VFD system has been deployed successfully in three different manufacturing companies and the PCB inspection system is the process of being deployed in a manufacturing plant.
Sedimentology and sequence stratigraphy from outcrops of the Kribi-Campo sub-basin: Lower Mundeck Formation (Lower Cretaceous, southern Cameroon)

Science.gov (United States)

Ntamak-Nida, Marie Joseph; Bourquin, Sylvie; Makong, Jean-Claude; Baudin, François; Mpesse, Jean Engelbert; Ngouem, Christophe Itjoko; Komguem, Paul Bertrand; Abolo, Guy Martin

2010-08-01

The Kribi-Campo sub-basin is composed of an Early to Mid Cretaceous series from West Africa's Atlantic coast and is located in southern Cameroon in the Central African equatorial rain forest. It is the smallest coastal basin in Cameroon and forms the southern part of the Douala/Kribi-Campo basin known as Douala basin ( s.l.). Until now, no detailed sedimentological studies have been carried out on the outcrops of this basin located in the Campo area. The aim of this study was to characterise the depositional environments, vertical evolution and tectonic context of these Lower Cretaceous series in order to make a comparison with adjacent basins and replace them in the geodynamic context. Facies analysis of the Lower Mundeck Formation (Lower Cretaceous) indicates the presence of four major, interfigered facies associations, that are inferred to represent elements of an alluvial to lacustrine-fan delta system. The clast lithologies suggest proximity of relief supplying coarse-grained sediment during the deposition of the Lower Mundeck Formation at Campo. The general dip and direction of the bedding is approximately 10°-12°NW, which also corresponds to the orientation of the foliations in the underlying metamorphic basement. The main sedimentary succession is characterised by a major retrogradational/progradational cycle of Late Aptian age, evaluated at about 3 Ma, with a well-developed progradational trend characterised by fluctuations of the recognised depositional environments. Fluctuations in lake level and sediment supply were possibly controlled by active faults at the basin margin, although climatic changes may have also played a role. The consistently W-WNW palaeoflow of sediments suggests that the palaeorelief was located to the east and could be oriented in a NNE-SSW direction, downthrown to the west. Local outcrops dated as Albian, both north and south of the main outcrop, display some marine influence. These deposits are cut by 040-060 faults parallel to
Project installation the large equipment in line system in Brazil. Gas export line valve P-40 FPSO-MLS. Field Marlim Sul, Campos Basin, Brazil; Operacao de instalacao do maior equipamento no sistema in line ja realizado no Brasil. Valvula do gasoduto P-40 X FPSO-MLS. Campo de Marlim Sul, Bacia de Campos, Brasil

Energy Technology Data Exchange (ETDEWEB)

Marques, Marcos Antonio Rodrigues; Fernandes, Paulo Tavares [PETROBRAS, Campos dos Goytacases, RJ (Brazil). Exploracao e Producao

2005-07-01

This work will approach the current level of development of the installation of connected underwater equipment to flexible lines in the underwater engineering operations in Campos' Basin. The project will show studies, analysis and simulations (through software developed by PETROBRAS) about the installation of the largest equipment laid in the 'in-line' system (connected to flexible lines) in Brazil - and one of the largest of the world: the ESDV (Emergency Shut Down Valve) of the gas pipeline P-40 x FPSO-MLS, in the South Marlim field, in Campos' Basin. This ESDV, of about 18.000 kg, 4 m height and 6,5 m length, has the purpose of assuring the safety conditions on the facilities, interrupting the gas flow exported for P-40 in case of emergency situations. Its installation opened a new alternative in releasing underwater equipment, using the ships that install the flexible lines. This operation occurred in June, 2004, and required the use of a second vessel for support and monitoring of the ESDV laying. The ESDV was installed at 400 m from FPSO-MLS, in a water depth of 1.137 m. This method shall be used broadly by the company in the implantation of the new units of Campos' Basin, and the upcoming studies must consider the gradual increase of the water depth in the new projects. This work will focus the technological development in this area, and one of its purposes is to foresee the future difficulties that can appear in the implantation of the production systems in deep and ultra-deep waters. (author)
Machine Directional Register System Modeling for Shaft-Less Drive Gravure Printing Machines

Directory of Open Access Journals (Sweden)

Shanhui Liu

2013-01-01

Full Text Available In the latest type of gravure printing machines referred to as the shaft-less drive system, each gravure printing roller is driven by an individual servo motor, and all motors are electrically synchronized. The register error is regulated by a speed difference between the adjacent printing rollers. In order to improve the control accuracy of register system, an accurate mathematical model of the register system should be investigated for the latest machines. Therefore, the mathematical model of the machine directional register (MDR system is studied for the multicolor gravure printing machines in this paper. According to the definition of the MDR error, the model is derived, and then it is validated by the numerical simulation and experiments carried out in the experimental setup of the four-color gravure printing machines. The results show that the established MDR system model is accurate and reliable.
Evaluación del estilo cognitivo «Dependencia/independencia de campo» en el contexto de los problemas de ansiedad

Directory of Open Access Journals (Sweden)

Juan Manuel Ramos Martín

2006-01-01

Full Text Available Su sencillez, comodidad y cualidades psicométricas hacen del GEFT un instrumento atractivo para valorar la Dependencia de Campo. Ha sido utilizado, entre otras áreas, en el contexto de los problemas de ansiedad, observándose una relación no con el "rasgo", pero sí con el "estado" de ansiedad. Nosotros lo hemos utilizado con una muestra de 79 sujetos, junto con el ISRA, para veri¬ficar si la Dependencia de campo es un factor de vulnerabilidad para la ansiedad y, con 53 sujetos, para ver si tiene repercusión en el aprovechamiento terapéutico. Resultados: los Dependientes tienen unos niveles de ansiedad mayores (p=0,018. El tratamiento beneficia más a los Independientes, y lo hace en el sistema de respuesta cognitivo (p=0,047. Se aconseja atomizar el constructo en subprocesos que permitan una mejor identificación de los mecanismos implicados en la desventaja que presentan los Dependientes de campo ante los problemas de ansiedad.
Machine learning and radiology.

Science.gov (United States)

Wang, Shijun; Summers, Ronald M

2012-07-01

In this paper, we give a short introduction to machine learning and survey its applications in radiology. We focused on six categories of applications in radiology: medical image segmentation, registration, computer aided detection and diagnosis, brain function or activity analysis and neurological disease diagnosis from fMR images, content-based image retrieval systems for CT or MRI images, and text analysis of radiology reports using natural language processing (NLP) and natural language understanding (NLU). This survey shows that machine learning plays a key role in many radiology applications. Machine learning identifies complex patterns automatically and helps radiologists make intelligent decisions on radiology data such as conventional radiographs, CT, MRI, and PET images and radiology reports. In many applications, the performance of machine learning-based automatic detection and diagnosis systems has shown to be comparable to that of a well-trained and experienced radiologist. Technology development in machine learning and radiology will benefit from each other in the long run. Key contributions and common characteristics of machine learning techniques in radiology are discussed. We also discuss the problem of translating machine learning applications to the radiology clinical setting, including advantages and potential barriers. Copyright © 2012. Published by Elsevier B.V.

Oil pipelines inspection with high wall thickness using MFL tool - Campos Basin experience; Inspecao de oleoduto com paredes espessas com ferramenta MFL - a experiencia da Bacia de Campos

Energy Technology Data Exchange (ETDEWEB)

Franzoi, Aldo; Camerini, Claudio; Bueno, Sergio I.O. [PETROBRAS, Rio de Janeiro, RJ (Brazil); Franca, Andre; Miranda, Ivan V. Janvrot; Silva, Jose A.P.; Lima, Vinicius [PipeWay Engenharia, Rio de Janeiro, RJ (Brazil)

2005-07-01

Campos Basin deep water pipelines are designed to out stand internal pressure, launching loads and buckling witch demands high wall thickness up to 1 inch. On the other hand, operational conditions require high pumping temperatures to meet requirements of flow assurance. This scenario becomes difficult internal survey specially MFL tools. The present work describes PETROBRAS effort, with PipeWay partnership, looking for alternatives for internal inspection on those pipelines using MFL specially designed, showing details and results from a recent survey. (author)
Salida de campo al Sotillo (Valladolid) el 5 de febrero de 1952

OpenAIRE

Valverde Gómez, José Antonio, 1926-2003

2008-01-01

Salida de campo al "Sotillo", en Valladolid capital, el 5 de febrero de 1952, de la que se anotaron observaciones sobre las siguientes aves: Accipiter nisus (Gavilán común, también llamado Astur palumbarius por el autor), Aegithalos caudatus (Mito), Alectoris rufa (Perdiz roja), Cettia cetti (Ruiseñor bastardo), Corvus frugilegus (Graja), Corvus monedula (Grajilla, llamada Coloeus por el autor), Cyanistes caeruleus (Herrerillo común, llamado Parus coeruleus por el autor), Emberiza cirlus (Es...
RELACIÓN ENTRE DIFERENTES PRUEBAS DE CAMPO: FUERZA, POTENCIA Y VELOCIDAD

OpenAIRE

Jessenia Hernández Elizondo

2003-01-01

Esta investigación tuvo como propósito principal el encontrar por medio de pruebas en las variables de fuerza, potencia y velocidad, la relación matemática existente entre estos tres constructos. Participaron 56 sujetos varones con edades entre 18 y 25 años. Con el fin de responder al objetivo del estudio, se les aplicaron pruebas de campo de fuerza (1RM de sentadilla completa y repeticiones máximas al 80% 60% 40% y 20%), de velocidad (30 metros lanzados y 30 metros sin impulso), y de potenci...
El impuesto al valor agregado en los contratos de campos marginales

OpenAIRE

Niquinga Salazar, Oscar Javier

2007-01-01

Esta investigación dirigida por los métodos de investigación sistemático, exegético, y teleológico, pretende analizar los contratos petroleros de Campos Marginales utilizados por la legislación ecuatoriana y específicamente, el papel de Impuesto al Valor Agregado en la producción de la Curva Base; ésta, se convierte en una figura contractual innovadora que ha producido una interesante discusión a nivel nacional; sin embargo, la propuesta de este trabajo va encaminado a encontra...
O desafio da análise de redes de saúde no campo da saúde coletiva

Directory of Open Access Journals (Sweden)

Carlos Eduardo Menezes Amaral

Full Text Available Resumo A organização do cuidado no Sistema Único de Saúde tem conferido destaque às redes de atenção, tanto no campo discursivo como na sua tradução em estratégias concretas. Contudo, são escassos os aportes analíticos e avaliativos abarcando as redes enquanto objeto. Neste artigo, apresentamos alguns subsídios sob forma de um construto multidimensional que dialoga com as contribuições de autores do campo da saúde coletiva e de outros campos disciplinares que se debruçaram sobre o tema. Nossa proposta apresenta cinco dimensões, sistematizadas depois de um exercício conduzido pelo método analítico reflexivo, tomando como material 23 artigos concernentes a distintos aspectos relevantes à análise de redes de saúde. Esse exercício, operacionalizando um processo sucessivo de redução semântica, resultou em um modelo composto pelas seguintes dimensões: Unidades mínimas, compreendendo a caracterização dos pontos fixos a partir dos quais ocorrem as conexões da rede; Conectividade, representando as modalidades e efeitos das relações estabelecidas entre as unidades mínimas; Integração, concernente aos efeitos do conjunto das unidades mínimas e suas relações, identificados como coerência, continuidade e complementaridade de ações na rede; Normatividade, indicando a construção e adesão a diretrizes clínicas e linhas de cuidado singulares, assim como o estabelecimento de critérios de encaminhamento, entrada e saída de cada ponto da rede; e Subjetividade, incluindo protagonismos, sentidos, valores e vínculos afetivos circulantes na rede. Essas dimensões, operando de forma recursiva, podem subsidiar a construção de modelos analítico-conceituais de redes como aporte à superação desse desafio no campo da saúde coletiva.
Machining with abrasives

CERN Document Server

Jackson, Mark J

2011-01-01

Abrasive machining is key to obtaining the desired geometry and surface quality in manufacturing. This book discusses the fundamentals and advances in the abrasive machining processes. It provides a complete overview of developing areas in the field.
The Knife Machine. Module 15.

Science.gov (United States)

South Carolina State Dept. of Education, Columbia. Office of Vocational Education.

This module on the knife machine, one in a series dealing with industrial sewing machines, their attachments, and operation, covers one topic: performing special operations on the knife machine (a single needle or multi-needle machine which sews and cuts at the same time). These components are provided: an introduction, directions, an objective,…
Digital model of the seabed geomorphology of southern-central Espirito Santo basin and northern Campos basin; Modelo digital da geomorfologia do fundo oceanico do centro-sul da bacia do Espirito Santo e norte da bacia de Campos

Energy Technology Data Exchange (ETDEWEB)

Schreiner, Simone; Souza, Mariana Beatriz Ferraz Mendonca de; Migliorelli, Joana Paiva Robalo [Petroleo Brasileiro S. A. (PETROBRAS), Rio de Janeiro, RJ (Brazil). Unidade de Servicos de Exploracao e Producao], Emails: schreiner@petrobras.com.br, mbfms.fototerra@petrobras.com.br, joanamigli.fototerra@petrobras.com.br

2009-05-15

That communication brings the result of a bathymetric mosaic of converted in a digital model of the ocean topography, consisting of 17 seismic projects 3D, besides 17 multibeam bathymetry surveys of South-Central Espirito Santo Basin and Northern Campos Basin.
Restrictions of process machine retooling at machine-building enterprises

Directory of Open Access Journals (Sweden)

Kuznetsova Elena

2017-01-01

Full Text Available The competitiveness of the national economy depends on the technological level of the machine-building enterprises production equipment. Today in Russia there are objective and subjective restrictions for the optimum policy formation of the manufacturing equipment renewal. The analysis of the manufacturing equipment age structure dynamics in the Russian machine-building complex indicates the negative tendencies intensification: increase in the equipment service life, reduction in the share of up-to-date equipment, and drop in its use efficiency. The article investigates and classifies the main restrictions of the manufacturing equipment renewal process, such as regulatory and legislative, financial, organizational, competency-based. The economic consequences of the revealed restrictions influence on the machine-building enterprises activity are shown.
Mechanical design of machine components

CERN Document Server

Ugural, Ansel C

2015-01-01

Mechanical Design of Machine Components, Second Edition strikes a balance between theory and application, and prepares students for more advanced study or professional practice. It outlines the basic concepts in the design and analysis of machine elements using traditional methods, based on the principles of mechanics of materials. The text combines the theory needed to gain insight into mechanics with numerical methods in design. It presents real-world engineering applications, and reveals the link between basic mechanics and the specific design of machine components and machines. Divided into three parts, this revised text presents basic background topics, deals with failure prevention in a variety of machine elements and covers applications in design of machine components as well as entire machines. Optional sections treating special and advanced topics are also included.Key Features of the Second Edition:Incorporates material that has been completely updated with new chapters, problems, practical examples...
Soft computing in machine learning

CERN Document Server

Park, Jooyoung; Inoue, Atsushi

2014-01-01

As users or consumers are now demanding smarter devices, intelligent systems are revolutionizing by utilizing machine learning. Machine learning as part of intelligent systems is already one of the most critical components in everyday tools ranging from search engines and credit card fraud detection to stock market analysis. You can train machines to perform some things, so that they can automatically detect, diagnose, and solve a variety of problems. The intelligent systems have made rapid progress in developing the state of the art in machine learning based on smart and deep perception. Using machine learning, the intelligent systems make widely applications in automated speech recognition, natural language processing, medical diagnosis, bioinformatics, and robot locomotion. This book aims at introducing how to treat a substantial amount of data, to teach machines and to improve decision making models. And this book specializes in the developments of advanced intelligent systems through machine learning. It...
Mankind, machines and people

Energy Technology Data Exchange (ETDEWEB)

Hugli, A

1984-01-01

The following questions are addressed: is there a difference between machines and men, between human communication and communication with machines. Will we ever reach the point when the dream of artificial intelligence becomes a reality. Will thinking machines be able to replace the human spirit in all its aspects. Social consequences and philosophical aspects are addressed. 8 references.
A Concrete Framework for Environment Machines

DEFF Research Database (Denmark)

Biernacka, Malgorzata; Danvy, Olivier

2007-01-01

calculus with explicit substitutions), we extend it minimally so that it can also express one-step reduction strategies, and we methodically derive a series of environment machines from the specification of two one-step reduction strategies for the lambda-calculus: normal order and applicative order....... The derivation extends Danvy and Nielsen’s refocusing-based construction of abstract machines with two new steps: one for coalescing two successive transitions into one, and the other for unfolding a closure into a term and an environment in the resulting abstract machine. The resulting environment machines...... include both the Krivine machine and the original version of Krivine’s machine, Felleisen et al.’s CEK machine, and Leroy’s Zinc abstract machine....
Findings From the National Machine Guarding Program-A Small Business Intervention: Machine Safety.

Science.gov (United States)

Parker, David L; Yamin, Samuel C; Xi, Min; Brosseau, Lisa M; Gordon, Robert; Most, Ivan G; Stanley, Rodney

2016-09-01

The purpose of this nationwide intervention was to improve machine safety in small metal fabrication businesses (3 to 150 employees). The failure to implement machine safety programs related to guarding and lockout/tagout (LOTO) are frequent causes of Occupational Safety and Health Administration (OSHA) citations and may result in serious traumatic injury. Insurance safety consultants conducted a standardized evaluation of machine guarding, safety programs, and LOTO. Businesses received a baseline evaluation, two intervention visits, and a 12-month follow-up evaluation. The intervention was completed by 160 businesses. Adding a safety committee was associated with a 10% point increase in business-level machine scores (P increase in LOTO program scores (P < 0.0001). Insurance safety consultants proved effective at disseminating a machine safety and LOTO intervention via management-employee safety committees.
Raíces en el exilio: asentamiento (a)temporal para refugiados de la guerra siria: campo de Za'atari, Jordania

OpenAIRE

Fernández Cortés, Marta

2016-01-01

Qualificació obtinguda: 10 Matrícula d'honor A raíz del inicio de la guerra de Siria en el año 2011, millones de personas han tenido que huir de sus casas y buscar refugio en otros lugares. Una gran parte de ellos han ido a parar a campos de refugiados, territorios sin ley donde las condiciones de vida son muy precarias, y sus habitantes han perdido muchos de sus derechos y dignidad. Este proyecto se centra en Za’atari, uno de los numerosos campos de refugiados que han surgido a partir...
Escritores comprometidos, campo literario y novela total en los años sesenta. Mario Vargas Llosa, lector de Cien años de soledad

Directory of Open Access Journals (Sweden)

Jorge Valenzuela Garcés

2011-07-01

Full Text Available El proyecto de “novela total” que concibieron y llevaron a la práctica connotados integrantes del “boom” de la novela hispanoamericana tuvo extraordinarias muestras en textos como Cien años de soledad o La casa verde. En este estudio nos ocupamos de describir el campo literario delos años sesenta y el modo en que este influye, a través de la figura del compromiso, en las demandas al escritor-intelectual de izquierda sobre la necesidad de proyectar, en los textos literarios, una imagen integral del proceso histórico y social del continente. El análisis se centra en la forma en que Vargas Llosa construye, a partir del análisis de una novela como Cien años de soledad, el proyecto de la novela total y el modo en que la novela del escritor colombiano representó esta totalidad respondiendoa las demandas del campo literario en un contexto marcado porun discurso que entonces explicaba la situación de retraso de nuestro continente debido a la dependencia del imperialismo.Palabras claves: Mario Vargas Llosa, novela total, campo intelectual, campo literario.
Porcentaje de artículos altamente citados: una medida comparable del impacto de revistas entre campos científicos

Directory of Open Access Journals (Sweden)

González-Betancor, Sara M.

2015-09-01

Full Text Available Currently the two most used bibliometric indicators for evaluating scholarly journals are the impact factor and the h-index. However, both indicators vary heavily depending on the scientific field, restricting comparability. In addition, the impact factor is not robust in dealing with articles with a large number of citations, while the h-index is dependent on the size of the journal. These limitations, when comparing journals of different sizes and fields, make it necessary to look to other journal impact factors that can be comparable between scientific fields, that are independent of the journal size, and that are also robust in the presence of items with a high number of citations. An alternative index is based on the percentage of highly cited articles in a journal. This paper empirically compares such an index with the impact factor and the h-index by using different time windows and levels of citation that can determine when a document can be considered as highly cited compared to others of the same year and discipline. The main outcome of this comparison suggests that the best index for obtaining data distributions that are comparable between scientific fields is by taking the 20% citation percentile over a three-year time frame for considering citations.Actualmente, los dos indicadores bibliométricos más empleados en la evaluación de revistas científicas son el índice de impacto y el índice h. Sin embargo, ambos indicadores dependen fuertemente del campo científico, lo que los hace no comparables entre campos. Además, el índice de impacto no es robusto a la presencia de artículos con un gran número de citas, mientras que el índice h depende del tamaño de la revista. Estas limitaciones a la hora de comparar revistas de diferentes tamaños y campos hace necesario considerar al mismo tiempo otros indicadores de impacto para revistas que sí puedan ser comparables entre campos, no dependan del tamaño de la revista y sean adem
Research on the proficient machine system. Theoretical part; Jukutatsu machine system no chosa kenkyu. Rironhen

Energy Technology Data Exchange (ETDEWEB)

NONE

1996-03-01

The basic theory of the proficient machine system to be developed was studied. Important proficient techniques in manufacturing industries are becoming extinct because of insufficient succession to next generation. The proficient machine system was proposed to cope with such situation. This machine system includes the mechanism for progress and evolution of techniques and sensibilities to be adaptable to environmental changes by learning and recognizing various motions such as work and process. Consequently, the basic research fields are composed of thought, learning, perception and action. This machine requires not only deigned fixed functions but also introduction of the same proficient concept as human being to be adaptable to changes in situation, purpose, time and machine`s complexity. This report explains in detail the basic concept, system principle, approaching procedure and practical elemental technologies of the proficient machine system, and also describes the future prospect. 133 refs., 110 figs., 7 tabs.
Machining of uranium and uranium alloys

International Nuclear Information System (INIS)

Morris, T.O.

1981-01-01

Uranium and uranium alloys can be readily machined by conventional methods in the standard machine shop when proper safety and operating techniques are used. Material properties that affect machining processes and recommended machining parameters are discussed. Safety procedures and precautions necessary in machining uranium and uranium alloys are also covered. 30 figures
Espectros biológicos florísticos de Campos Rupestres de afloramento e Campos Úmidos diferem entre si e em relação ao Espectro Biológico Normal de Raunkiaer. Floristic biological spectra of Rock outcrops and Wet grasslands differ between themselves and in relation to the Raunkiaer’s Normal Biological Spectrum.

Directory of Open Access Journals (Sweden)

Natalia de Oliveira COSTA

2012-12-01

Full Text Available A distribuição de frequência de classes de formas de vida em uma flora, conhecida como espectro biológico florístico, varia em função das condições climáticas e edáficas em que as plantas se desenvolvem. Neste trabalho comparamos os espectros biológicos médios (n = 3 de equivalentes a Campo Rupestre de afloramento e a Campo Úmido no Estado de São Paulo na expectativa de encontrar diferenças significativas entre os dois tipos de comunidade. Os Campos Rupestres (G-corrigido = 23,41; p-valor = 0,0001 e os Campos Úmidos (G-corrigido = 80,34; p < 0,0001 diferiram do Espectro Biológico Normal de Raunkiaer, bem como diferenciaram-se entre si (χ2 = 24,23; p < 0,0001. Uma Análise de Correspondência Distendida separou Campos Rupestres de Campos Úmidos devido às maiores frequências de fanerófitos nos primeiros e de hemicriptófitos e terófitos nos últimos. Sugerimos como hipóteses que os micro-habitats favoráveis ao desenvolvimentode fanerófitos sejam mais comuns nos Campos Rupestres de afloramento do que nos Campos Úmidos, ocorrendo o contrário com os micro-habitats favoráveis aos hemicriptófitos. Esta forma de vida pode apresentar melhor ajustamento ao encharcamento do solo do que os caméfitos e geófitos. A estratégia de escape apresentada pelos terófitos seria pouco eficiente em Campos Rupestres de afloramento devido à escassez de solo para proteção das sementes. The frequency distribution of life forms in a flora, called floristic biological spectrum, varies according to the climatic and edaphic conditions under which plants grow. In this work we compared the average (n = 3 biological spectra of Rock outcrop and Wet grassland like communities in São Paulo state expecting to find significant differences between the two community types. Rock outcrops (G-corrected = 23.41; p-value = 0.0001 and Wet grasslands (G-corrected = 80.34; p < 0.0001 differed from the Raunkiaer’s Normal Biological Spectrum, as did between

[Comparison of machinability of two types of dental machinable ceramic].

Science.gov (United States)

Fu, Qiang; Zhao, Yunfeng; Li, Yong; Fan, Xinping; Li, Yan; Lin, Xuefeng

2002-11-01

In terms of the problems of now available dental machinable ceramics, a new type of calcium-mica glass-ceramic, PMC-I ceramic, was developed, and its machinability was compared with that of Vita MKII quantitatively. Moreover, the relationship between the strength and the machinability of PMC-I ceramic was studied. Samples of PMC-I ceramic were divided into four groups according to their nucleation procedures. 600-seconds drilling tests were conducted with high-speed steel tools (Phi = 2.3 mm) to measure the drilling depths of Vita MKII ceramic and PMC-I ceramic, while constant drilling speed of 600 rpm and constant axial load of 39.2 N were used. And the 3-point bending strength of the four groups of PMC-I ceramic were recorded. Drilling depth of Vita MKII was 0.71 mm, while the depths of the four groups of PMC-I ceramic were 0.88 mm, 1.40 mm, 0.40 mm and 0.90 mm, respectively. Group B of PMC-I ceramic showed the largest depth of 1.40 mm and was statistically different from other groups and Vita MKII. And the strength of the four groups of PMC-I ceramic were 137.7, 210.2, 118.0 and 106.0 MPa, respectively. The machinability of the new developed dental machinable ceramic of PMC-I could meet the need of the clinic.
La definición del campo estatal y su relación con la guerra civil: un horizonte teórico

OpenAIRE

Manuel Alberto Alonso Espinal

2014-01-01

El artículo presenta algunos elementos teóricos que pueden resultar útiles para estudiar los procesos de formación del campo estatal y el papel de las guerras civiles en dichos procesos. En el texto se destacan cuatro asuntos: 1) la imposibilidad de estudiar el Estado bajo el presupuesto de la separación entre este y la sociedad; 2) la importancia de examinar el proceso de formación del campo estatal a partir de una perspectiva histórica y cultural que incluya, entre otras cosas, la reflexión...
O IMAGINÁRIO RURAL DO LEITOR URBANO: o sonho mítico da casa no campo

Directory of Open Access Journals (Sweden)

Gislene Silva

2009-06-01

Full Text Available Esta pesquisa procura compreender um fenômeno aparentemente comum: o sonho de muitos moradores urbanos em ter uma casa no campo. A investigação é feita junto aos leitores da revista Globo Rural, uma publicação especializada em atividades agrícolas. São assinantes que residem na cidade de São Paulo e não possuem nenhum tipo de propriedade no meio rural. O propósito deste estudo é tentar apreender os movimentos desse imaginário, contribuindo para o debate das conexões entre campo e cidade e para o entendimento da interação entre sujeitos e produtos culturais simbólicos, no cotidiano urbano contemporâneo. Diante da complexa relação do homem com a natureza e da condição histórica vivida numa metrópole nesta virada de século, percebe-se que, ao sonhar com a casa no campo, os leitores urbanos da revista não apenas se voltam de maneira saudosa para o passado rural. No tempo presente, eles tecem uma crítica profunda ao modelo civilizatório da urbanidade da metrópole e, olhando para frente, imaginam um futuro melhor fora da cidade, no meio rural, mais perto das coisas da natureza, num lugar mais solidário, longe da violência, do trânsito pesado, da poluição e com mais qualidade de vida.
Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

OpenAIRE

Ming Cheng; Le Sun; Giuseppe Buja; Lihua Song

2015-01-01

The paper presents a number of advanced solutions on electric machines and machine-based systems for the powertrain of electric vehicles (EVs). Two types of systems are considered, namely the drive systems designated to the EV propulsion and the power split devices utilized in the popular series-parallel hybrid electric vehicle architecture. After reviewing the main requirements for the electric drive systems, the paper illustrates advanced electric machine topologies, including a stator perm...
Findings from the National Machine Guarding Program–A Small Business Intervention: Machine Safety

Science.gov (United States)

Yamin, Samuel C.; Xi, Min; Brosseau, Lisa M.; Gordon, Robert; Most, Ivan G.; Stanley, Rodney

2016-01-01

Objectives The purpose of this nationwide intervention was to improve machine safety in small metal fabrication businesses (3 – 150 employees). The failure to implement machine safety programs related to guarding and lockout/tagout (LOTO) are frequent causes of OSHA citations and may result in serious traumatic injury. Methods Insurance safety consultants conducted a standardized evaluation of machine guarding, safety programs, and LOTO. Businesses received a baseline evaluation, two intervention visits and a twelve-month follow-up evaluation. Results The intervention was completed by 160 businesses. Adding a safety committee was associated with a 10-percentage point increase in business-level machine scores (p< 0.0001) and a 33-percentage point increase in LOTO program scores (p <0.0001). Conclusions Insurance safety consultants proved effective at disseminating a machine safety and LOTO intervention via management-employee safety committees. PMID:26716850
Machine Tool Software

Science.gov (United States)

1988-01-01

A NASA-developed software package has played a part in technical education of students who major in Mechanical Engineering Technology at William Rainey Harper College. Professor Hack has been using (APT) Automatically Programmed Tool Software since 1969 in his CAD/CAM Computer Aided Design and Manufacturing curriculum. Professor Hack teaches the use of APT programming languages for control of metal cutting machines. Machine tool instructions are geometry definitions written in APT Language to constitute a "part program." The part program is processed by the machine tool. CAD/CAM students go from writing a program to cutting steel in the course of a semester.
Machine Ethics: Creating an Ethical Intelligent Agent

OpenAIRE

Anderson, Michael; Anderson, Susan Leigh

2007-01-01

The newly emerging field of machine ethics (Anderson and Anderson 2006) is concerned with adding an ethical dimension to machines. Unlike computer ethics -- which has traditionally focused on ethical issues surrounding humans' use of machines -- machine ethics is concerned with ensuring that the behavior of machines toward human users, and perhaps other machines as well, is ethically acceptable. In this article we discuss the importance of machine ethics, the need for machines that represent ...
Nanocomposites for Machining Tools

Directory of Open Access Journals (Sweden)

Daria Sidorenko

2017-10-01

Full Text Available Machining tools are used in many areas of production. To a considerable extent, the performance characteristics of the tools determine the quality and cost of obtained products. The main materials used for producing machining tools are steel, cemented carbides, ceramics and superhard materials. A promising way to improve the performance characteristics of these materials is to design new nanocomposites based on them. The application of micromechanical modeling during the elaboration of composite materials for machining tools can reduce the financial and time costs for development of new tools, with enhanced performance. This article reviews the main groups of nanocomposites for machining tools and their performance.
Machine learning with R

CERN Document Server

Lantz, Brett

2013-01-01

Written as a tutorial to explore and understand the power of R for machine learning. This practical guide that covers all of the need to know topics in a very systematic way. For each machine learning approach, each step in the process is detailed, from preparing the data for analysis to evaluating the results. These steps will build the knowledge you need to apply them to your own data science tasks.Intended for those who want to learn how to use R's machine learning capabilities and gain insight from your data. Perhaps you already know a bit about machine learning, but have never used R; or
REFLEXÕES SOBRE MODERNIDADE, TURISMO E CAMPO SOCIAL NO ESTADO DE ALAGOAS - BRASIL

Directory of Open Access Journals (Sweden)

Daniel Arthur Lisboa de Vasconcelos

2013-02-01

Full Text Available O presente artigo, de caráter ensaístico, visa a contribuir com reflexões sobre modernidade, turismo e campo social sociais no Estado de Alagoas - Brasil. Utilizando o referencial de autores como Giddens (2001, Jameson (2002 e Harvey (1992, dentre outros, sintetizaremos algumas características das transições socioculturais da modernidade para o atual estágio do modo de produção capitalista, período que muitos têm considerado como a “pós-modernidade”. Posteriormente, empreenderemos breve descrição crítica acerca do atual modelo de turistificação no Estado, com base nos conceitos de Habitus e Campo Social, de Pierre Bourdieu. Conclui-se que o turismo em Alagoas está ancorado em roteiros que, em sua dominância, têm se consolidado sob os enunciados de Sol e Mar, tendência natural do turismo de massa que ocorre nas regiões intertropicais do mundo inteiro, em caso mais especifico, no Nordeste Brasileiro, e que também sofre direta influência da formação histórica de uma cultura de alheamento às potencialidades dos patrimônios identitários locais.
Restrictions of process machine retooling at machine-building enterprises

OpenAIRE

Kuznetsova Elena; Tipner Ludmila; Ershov Alexey

2017-01-01

The competitiveness of the national economy depends on the technological level of the machine-building enterprises production equipment. Today in Russia there are objective and subjective restrictions for the optimum policy formation of the manufacturing equipment renewal. The analysis of the manufacturing equipment age structure dynamics in the Russian machine-building complex indicates the negative tendencies intensification: increase in the equipment service life, reduction in the share of...
Pattern recognition & machine learning

CERN Document Server

Anzai, Y

1992-01-01

This is the first text to provide a unified and self-contained introduction to visual pattern recognition and machine learning. It is useful as a general introduction to artifical intelligence and knowledge engineering, and no previous knowledge of pattern recognition or machine learning is necessary. Basic for various pattern recognition and machine learning methods. Translated from Japanese, the book also features chapter exercises, keywords, and summaries.
Sociología del conocimiento: elementos introductorios desde Pierre Bourdieu para pensar los problemas de construcción y consolidación del campo comunicológico crítico.

Directory of Open Access Journals (Sweden)

Carlos Reyes Velásquez

2013-12-01

Full Text Available El documento que presentamos a continuación, releva algunos elementos epistemológicos fundamentales de la Sociología del Conocimiento de Pierre Bourdieu, como insumos teóricos clave para pensar los problemas de construcción del campo comunicológico crítico, asociados a su consolidación y configuración dentro del campo de las Ciencias Sociales y dentro de su propio dominio epistémico. Para aquello, se sistematiza y reflexiona en torno a categorías conceptuales como Campo, Campo Científico o Reflexividad Epistémica, en los problemas dela ontología de los dos planos de la realidad social y el arraigo social de los productores de conocimiento.
Parallel-Machine Scheduling with Time-Dependent and Machine Availability Constraints

Directory of Open Access Journals (Sweden)

Cuixia Miao

2015-01-01

Full Text Available We consider the parallel-machine scheduling problem in which the machines have availability constraints and the processing time of each job is simple linear increasing function of its starting times. For the makespan minimization problem, which is NP-hard in the strong sense, we discuss the Longest Deteriorating Rate algorithm and List Scheduling algorithm; we also provide a lower bound of any optimal schedule. For the total completion time minimization problem, we analyze the strong NP-hardness, and we present a dynamic programming algorithm and a fully polynomial time approximation scheme for the two-machine problem. Furthermore, we extended the dynamic programming algorithm to the total weighted completion time minimization problem.
The Hooey Machine.

Science.gov (United States)

Scarnati, James T.; Tice, Craig J.

1992-01-01

Describes how students can make and use Hooey Machines to learn how mechanical energy can be transferred from one object to another within a system. The Hooey Machine is made using a pencil, eight thumbtacks, one pushpin, tape, scissors, graph paper, and a plastic lid. (PR)
Tuberculosis pulmonar de campos inferiores

Directory of Open Access Journals (Sweden)

Alejandra González

2010-10-01

Full Text Available La tuberculosis (TB que compromete sólo los campos pulmonares inferiores (TBCI es poco frecuente en el adulto y en general está asociada a alguna causa de inmunodepresión. El objetivo de nuestro trabajo fue determinar la incidencia de TBCI en nuestra población y comparar sus características respecto de la TB pulmonar de localización habitual. Se estudiaron en forma retrospectiva en el período de 2004 a 2008, 42 pacientes con TBCI que fueron comparados con 84 pacientes con TB pulmonar de localización habitual (grupo control. Se excluyeron pacientes con HIV. La TBCI representó el 6% del total de TB pulmonar. No se encontraron diferencias significativas en cuanto a edad, sexo, presencia de cavidades en la radiografía, días de evolución y nivel de albúmina. La TBCI tuvo significativamente mayor proporción de comorbilidades (p < 0.001, presencia de condensación (p < 0.001 y compromiso unilateral (p < 0.001 en la radiografía de tórax, junto con mayor número de internaciones (p = 0.02. Cabe destacar que sólo16 de los 42 pacientes con TBCI (38% tenían alguna comorbilidad demostrada. La TBCI puede presentarse aun sin comorbilidades asociadas y debe sospecharse en neumonías de evolución tórpida independientemente de su localización.
Machine Vision Handbook

CERN Document Server

2012-01-01

The automation of visual inspection is becoming more and more important in modern industry as a consistent, reliable means of judging the quality of raw materials and manufactured goods . The Machine Vision Handbook equips the reader with the practical details required to engineer integrated mechanical-optical-electronic-software systems. Machine vision is first set in the context of basic information on light, natural vision, colour sensing and optics. The physical apparatus required for mechanized image capture – lenses, cameras, scanners and light sources – are discussed followed by detailed treatment of various image-processing methods including an introduction to the QT image processing system. QT is unique to this book, and provides an example of a practical machine vision system along with extensive libraries of useful commands, functions and images which can be implemented by the reader. The main text of the book is completed by studies of a wide variety of applications of machine vision in insp...
Effect of the Machined Surfaces of AISI 4337 Steel to Cutting Conditions on Dry Machining Lathe

Science.gov (United States)

Rahim, Robbi; Napid, Suhardi; Hasibuan, Abdurrozzaq; Rahmah Sibuea, Siti; Yusmartato, Y.

2018-04-01

The objective of the research is to obtain a cutting condition which has a good chance of realizing dry machining concept on AISI 4337 steel material by studying surface roughness, microstructure and hardness of machining surface. The data generated from the experiment were then processed and analyzed using the standard Taguchi method L9 (34) orthogonal array. Testing of dry and wet machining used surface test and micro hardness test for each of 27 test specimens. The machining results of the experiments showed that average surface roughness (Raavg) was obtained at optimum cutting conditions when VB 0.1 μm, 0.3 μm and 0.6 μm respectively 1.467 μm, 2.133 μm and 2,800 μm fo r dry machining while which was carried out by wet machining the results obtained were 1,833 μm, 2,667 μm and 3,000 μm. It can be concluded that dry machining provides better surface quality of machinery results than wet machining. Therefore, dry machining is a good choice that may be realized in the manufacturing and automotive industries.
Evaluation of machinability and flexural strength of a novel dental machinable glass-ceramic.

Science.gov (United States)

Qin, Feng; Zheng, Shucan; Luo, Zufeng; Li, Yong; Guo, Ling; Zhao, Yunfeng; Fu, Qiang

2009-10-01

To evaluate the machinability and flexural strength of a novel dental machinable glass-ceramic (named PMC), and to compare the machinability property with that of Vita Mark II and human enamel. The raw batch materials were selected and mixed. Four groups of novel glass-ceramics were formed at different nucleation temperatures, and were assigned to Group 1, Group 2, Group 3 and Group 4. The machinability of the four groups of novel glass-ceramics, Vita Mark II ceramic and freshly extracted human premolars were compared by means of drilling depth measurement. A three-point bending test was used to measure the flexural strength of the novel glass-ceramics. The crystalline phases of the group with the best machinability were identified by X-ray diffraction. In terms of the drilling depth, Group 2 of the novel glass-ceramics proves to have the largest drilling depth. There was no statistical difference among Group 1, Group 4 and the natural teeth. The drilling depth of Vita MK II was statistically less than that of Group 1, Group 4 and the natural teeth. Group 3 had the least drilling depth. In respect of the flexural strength, Group 2 exhibited the maximum flexural strength; Group 1 was statistically weaker than Group 2; there was no statistical difference between Group 3 and Group 4, and they were the weakest materials. XRD of Group 2 ceramic showed that a new type of dental machinable glass-ceramic containing calcium-mica had been developed by the present study and was named PMC. PMC is promising for application as a dental machinable ceramic due to its good machinability and relatively high strength.
A produção acadêmica sobre educação do campo no Brasil: currículos e sujeitos demandados = Academic production on rural education in Brazil: the curriculum and subject requested

Directory of Open Access Journals (Sweden)

Ribeiro, Vândiner

2012-01-01

Full Text Available A discussão sobre a valorização da cultura do campo e a introdução de conhecimentos considerados especificamente campesinos nos currículos escolares mobilizou estudiosos(as que se dedicam a discutir a questão da educação do campo. Essa discussão levanta polêmicas sobre a dicotomia campo-cidade e sobre a necessidade ou não de currículos diferenciados para esse público. Há, por um lado, defesa de que as pessoas do campo precisam de um currículo com conhecimentos específicos, diferente dos demais existentes. Por outro, há quem defenda que é preciso mudar o currículo de todos e não somente o endereçado às pessoas do campo. Este artigo discute o que os estudos sobre educação do campo no Brasil vêm dizendo sobre as questões curriculares; que críticas fazem aos currículos existentes; que demandas relativas ao currículo fazem; e que tipo de formação demanda que seja dada às pessoas que vivem no campo. Analisou-se para isso artigos sobre educação do campo no Brasil em sete revistas de Educação no período de 1987 a 2009 e os trabalhos sobre a temática apresentados na ANPEd

Machining a glass rod with a lathe-type electro-chemical discharge machine

International Nuclear Information System (INIS)

Furutani, Katsushi; Maeda, Hideaki

2008-01-01

This paper deals with the performance of electro-chemical discharge machining (ECDM) of a revolving glass rod. ECDM has been studied for machining insulating materials such as glass and ceramics. In conventional ECDM, an insulating workpiece is dipped in an electrolyte as a working fluid and a tool electrode is pressed on the surface with a small load. In the experiments, a workpiece was revolved to provide fresh working fluid into a gap between the tool electrode and the workpiece. A soda lime grass rod was machined with a thin tungsten rod in NaCl solution. The applied voltage was changed up to 40 V. The rotation speed was set to 0, 0.3, 3 and 30 min −1 . Discharge was observed over an applied voltage of 30 V. The width and depth of the machined grooves and the surface roughness of their bottom were increased with increase of the applied voltage. Although the depth of machining at 3 min −1 was the same as that at 30 min −1 , the width and roughness at 30 min −1 were smaller than those at 3 min −1 . Moreover, because the thickness of vaporization around the tool electrode was decreased with increase of the rotation speed, the width of the machined groove became smaller
Análisis de la accesibilidad en los campos de golf de la Región de Murcia

Directory of Open Access Journals (Sweden)

P. Zarco-Pérez

2012-01-01

Full Text Available Otorgar el correcto nivel de accesibilidad en los campos de golf es una premisa fundamental si se quiere fomentar y facilitar el acceso a la práctica del golf por personas con discapacidad. El presente estudio trata de analizar la accesibilidad en los campos de golf de la Región de Murcia. Para ello se recurre a un estudio de carácter cuantitativo utilizando una hoja de observación creada a partir de los criterios de accesibilidad encontrados en la legislación estatal y regional vigente, en la que se evalúa la accesibilidad de todos los campos de golf de 18 hoyos de la Comunidad Autónoma de Murcia. Los resultados indican que no se cumple la normativa vigente en torno a la accesibilidad ya que el cumplimiento de los ítems se sitúa por debajo de la mitad (40,88%. El área de accesos presenta el mejor resultado, con un 50,54% de ítems cumplidos de media, mientras que los vestuarios presentan los peores resultados, con un 34,94%. En todas las áreas se observa cómo la señalización y mobiliario presentan los porcentajes más bajos. Sería necesario tomar medidas para superar los criterios de accesibilidad requeridos para estos espacios.
Salida de campo a Les Echets (Francia) el 7 de junio de 1954

OpenAIRE

Valverde Gómez, José Antonio, 1926-2003

2008-01-01

Salida de campo a Les Echets (Francia) el 7 de junio de 1954, de la que se anotaron observaciones sobre las siguientes aves: Carduelis sp. (seguramente, el Jilguero, C.carduelis), Columba oenas (Paloma zurita), Miliaria calandra (Triguero, llamada Emberiza calandra por el autor), Phoenicurus ochruros (Colirrojo tizón), Phylloscopus collybita (Mosquitero común), Saxicola torquata (Tarabilla común), Streptopelia sp. (Tórtola) y Sylvia communis (Curruca zarcera). Field trip to Les Echets (Fra...
LEAF MICROMOPHOMETRY OF PALICOUREA RIGIDA KUNTH. (RUBIACEAE FROM BRAZILIAN CERRADO AND CAMPO RUPESTRE ENVIRONMENTS

Directory of Open Access Journals (Sweden)

Manuel Losada Gavilanes

2016-06-01

Full Text Available The objective of this work was to evaluate qualitative and quantitative leaf anatomical traits of Palicourea rigida Kunth. (Rubiaceae species occurring in the Brazilian Cerrado and Campo Rupestre ecosystems. Anatomical analysis was performed in fresh or fixed leaves processed with usual plant microtechnique. Leaves showed uniseriate epidermis in petiole and leaf blade which contains uniseriate nonglandular tricomes (tector type occurring only over the vascular bundles. Likewise, paracytic stomata were found only in abaxial side of the leaf surface. The mesophyll contains uniseriate palisade parenchyma and multiseriate spongy parenchyma (nine layers which showed cells with different morphology and size. Crystal idoblasts of different types were observed in both the petiole and leaf blade. Collateral vascular bundles were found both in the petiole and leaf blade. Leaf venation type was pinnate, campylodromous or brochydodromous. The micromorphometric analysis showed significant differences from plants of different environments for all leaf characteristics and Cerrado plants showed higher means for all evaluated traits. Therefore, the influence of environments may had modulated morphological responses in P. rigida, since no difference was found in the type or distribution of leaf tissues in Cerrado or Campo Rupestre.
Land use change and ecosystem service provision in Pampas and Campos grasslands of southern South America

NARCIS (Netherlands)

Modernel Hristoff, Pablo; Rossing, W.A.H.; Corbeels, M.; Dogliotti, S.; Picasso, V.; Tittonell, P.

2016-01-01

New livestock production models need to simultaneously meet the increasing global demand for meat and preserve biodiversity and ecosystem services. Since the 16th century beef cattle has been produced on the Pampas and Campos native grasslands in southern South America, with only small amounts of
An HTS machine laboratory prototype

DEFF Research Database (Denmark)

Mijatovic, Nenad; Jensen, Bogi Bech; Træholt, Chresten

2012-01-01

This paper describes Superwind HTS machine laboratory setup which is a small scale HTS machine designed and build as a part of the efforts to identify and tackle some of the challenges the HTS machine design may face. One of the challenges of HTS machines is a Torque Transfer Element (TTE) which...... conduction compared to a shaft. The HTS machine was successfully cooled to 77K and tests have been performed. The IV curves of the HTS field winding employing 6 HTS coils indicate that two of the coils had been damaged. The maximal value of the torque during experiments of 78Nm was recorded. Loaded with 33...
Análisis, cálculo y técnicas de mitigación de campos magnéticos creados por líneas eléctricas de alta tensión

OpenAIRE

Cruz Romero, Pedro Luis

2000-01-01

La tesis consiste en el desarrollo de un modelo de cálculo de campos magnéticos creados por líneas eléctricas aéreas, que permita, por un lado analizar las configuraciones existentes en relación con el campo magnético generado, y por otro estudiar diferentes técnicas de mitigación del campo magnético. En particular, se analizan la división de fases y la colocación de lazos pasivos y activos. Para el priemr método se obtienen las configuraciones que minimizan el campo magnético a diferentes di...
LHC Report: machine development

CERN Multimedia

Rogelio Tomás García for the LHC team

2015-01-01

Machine development weeks are carefully planned in the LHC operation schedule to optimise and further study the performance of the machine. The first machine development session of Run 2 ended on Saturday, 25 July. Despite various hiccoughs, it allowed the operators to make great strides towards improving the long-term performance of the LHC. The main goals of this first machine development (MD) week were to determine the minimum beam-spot size at the interaction points given existing optics and collimation constraints; to test new beam instrumentation; to evaluate the effectiveness of performing part of the beam-squeezing process during the energy ramp; and to explore the limits on the number of protons per bunch arising from the electromagnetic interactions with the accelerator environment and the other beam. Unfortunately, a series of events reduced the machine availability for studies to about 50%. The most critical issue was the recurrent trip of a sextupolar corrector circuit –...
Probability distribution of machining center failures

International Nuclear Information System (INIS)

Jia Yazhou; Wang Molin; Jia Zhixin

1995-01-01

Through field tracing research for 24 Chinese cutter-changeable CNC machine tools (machining centers) over a period of one year, a database of operation and maintenance for machining centers was built, the failure data was fitted to the Weibull distribution and the exponential distribution, the effectiveness was tested, and the failure distribution pattern of machining centers was found. Finally, the reliability characterizations for machining centers are proposed
Student Modeling and Machine Learning

OpenAIRE

Sison , Raymund; Shimura , Masamichi

1998-01-01

After identifying essential student modeling issues and machine learning approaches, this paper examines how machine learning techniques have been used to automate the construction of student models as well as the background knowledge necessary for student modeling. In the process, the paper sheds light on the difficulty, suitability and potential of using machine learning for student modeling processes, and, to a lesser extent, the potential of using student modeling techniques in machine le...
Chuva de sementes em remanescentes florestais de Campo Verde, MT

Directory of Open Access Journals (Sweden)

William Pietro-Souza

2014-08-01

Full Text Available O objetivo deste trabalho consistiu em avaliar sazonalmente a produção de sementes provenientes de fragmentos florestais presentes na zona rural de Campo Verde, MT. Essa caracterização ocorreu em termos de produção de sementes e riqueza de espécies vegetais. Foram selecionados três fragmentos florestais caracterizados como Floresta Estacional Semidecidual. Em cada fragmento, cinco coletores foram instalados e confeccionados com canos de PVC (1 m²; malha de náilon de 0,001 m e 0,15 m de profundidade do bojo. O material foi coletado mensalmente, cujas sementes foram quantificadas e separadas conforme a síndrome de dispersão, etapa sucessional e forma de vida. Houve a determinação da densidade, frequência absoluta, índice de diversidade e equitabilidade. Ao todo, foram obtidas 3.622 sementes, pertencentes a 74 táxons. Maiores densidades de sementes foram observadas durante os meses de setembro, outubro e novembro. As lianas Gouania sp., Fridericia speciosa, Heteropterys sp. e Distictella sp. responderam com 55,95% do total de sementes aportadas. Das espécies que compuseram a chuva de sementes, 74% não são dispersas pelo vento. Todavia, quando se verificou a quantidade de diásporos coletados, formas dispersas pelo vento foram predominantes, representando 76% do total. Citam-se como táxons arbóreos importantes para a recomposição florestal na região de Campo Verde, situada no Sudeste de Mato Grosso: Tachigali rubiginosa, Siparuna guianensis, Nectandra sp., Cordia alliodora, Alibertia sp., Terminalia brasiliensis e Myrcia sp. Essas espécies devem ser alvo de estudos mais específicos relacionados ao seu potencial para recuperação de ambientes degradados, considerando-se as Áreas de Preservação Permanente e Reservas Legais.
Efeito do pastejo sobre as assembleias de formigas nos campos sulinos

OpenAIRE

William Dröse

2015-01-01

A conservação da biodiversidade aliada ao uso sustentável dos ecossistemas é considerada um grande desafio. A atividade pastoril é um dos principais tipos de uso da terra e cobre cerca de 25% da superfície terrestre. No entanto, apenas recentemente é que a manutenção da biodiversidade dos ecossistemas surgiu como preocupação em função desta prática. Os Campos Sulinos são ambientes do sul do Brasil que abrigam uma ampla riqueza de espécies. As formigas desempenham papéis essenciais nestes ecos...
Characterization of ceramic bodies to produce bricks from Campos Goytacazes, Brazil

International Nuclear Information System (INIS)

Almeida, L.L.P. de; Maia, F.S.; Petrucci, L.J.T.; Pessanha, E.M.; Paixao, L.P.

2010-01-01

This work has for objective to study comparatively the characteristics and technological properties of four typical ceramic bodies from the region of Campos dos Goytacazes-RJ used to fabricate red ceramics. The characterization techniques used were: X-ray fluorescence, X-ray diffraction, differential thermal analysis (DTA), thermogravimetric analysis (TGA) and dilatometry. Specimens were molded by extrusion and then fired at 750, 850 and 950 deg C. The evaluated firing properties were: linear shrinkage and water absorption. The results showed that the investigated ceramic bodies have similar chemical and mineralogical composition. It is also concluded that the bodies are adequate to produce bricks. (author)
The Newest Machine Material

International Nuclear Information System (INIS)

Seo, Yeong Seop; Choe, Byeong Do; Bang, Meong Sung

2005-08-01

This book gives descriptions of machine material with classification of machine material and selection of machine material, structure and connection of material, coagulation of metal and crystal structure, equilibrium diagram, properties of metal material, elasticity and plasticity, biopsy of metal, material test and nondestructive test. It also explains steel material such as heat treatment of steel, cast iron and cast steel, nonferrous metal materials, non metallic materials, and new materials.
Introduction to machine learning

OpenAIRE

Baştanlar, Yalın; Özuysal, Mustafa

2014-01-01

The machine learning field, which can be briefly defined as enabling computers make successful predictions using past experiences, has exhibited an impressive development recently with the help of the rapid increase in the storage capacity and processing power of computers. Together with many other disciplines, machine learning methods have been widely employed in bioinformatics. The difficulties and cost of biological analyses have led to the development of sophisticated machine learning app...
Support vector machines applications

CERN Document Server

Guo, Guodong

2014-01-01

Support vector machines (SVM) have both a solid mathematical background and good performance in practical applications. This book focuses on the recent advances and applications of the SVM in different areas, such as image processing, medical practice, computer vision, pattern recognition, machine learning, applied statistics, business intelligence, and artificial intelligence. The aim of this book is to create a comprehensive source on support vector machine applications, especially some recent advances.
Machinability of advanced materials

CERN Document Server

Davim, J Paulo

2014-01-01

Machinability of Advanced Materials addresses the level of difficulty involved in machining a material, or multiple materials, with the appropriate tooling and cutting parameters. A variety of factors determine a material's machinability, including tool life rate, cutting forces and power consumption, surface integrity, limiting rate of metal removal, and chip shape. These topics, among others, and multiple examples comprise this research resource for engineering students, academics, and practitioners.
Measurements of Po214 at Sao Jose dos Campos and Cachoeira Paulista: correlation with meteorological data

International Nuclear Information System (INIS)

Marinho, E.V.A.; Nordemann, D.J.R.

1985-01-01

PO 214 , a short life daughter product of RN 222 , was measured by alpha-ray spectrometry of a atmospheric particles sampled on Millipore filters (0.8 μm pore) at Sao Jose dos Campos (23 0 12'S, 45 0 51'W) and Cachoeira Paulista (22 0 41'S, 45 0 00'W). The infleunce of rainfall on the atmospheric Po 214 was studied at Sao Jose dos Campos. The mean activity was 98 pCi/m 3 for dry days (without rain during the preceding two days). On the contrary a low mean activity of 35 pCi/m 3 was observed for high pluviometry days from 08/30 to 10/26 for which total rainfall was 365.5 mm. At Cachoeria Paulista the Po 214 activity was correlated with the stability of the air (measured by the Richardson number), showing an accumaltion of natural radioactive aerosols during periods of higher stability of the lower atmosphere. (author) [pt
Memória social da Batalha do Jenipapo: trilhas e enredos patrimoniais em Campo Maior (PI

Directory of Open Access Journals (Sweden)

Maria Dione Carvalho de Moraes

2011-01-01

Full Text Available Today, there is a considerable increase in the field of cultural referents to be "preserved" and, as a consequence, a proliferation of institutions/mechanisms triggered in face of the threat of disruption/disappearance of these referents, with a growing appreciation of local identities and a questioning of the past on the basis of circumstances and needs of the present. Within this memory boom, we focus the process of assigning meanings to an event narrated by historiography and oral tradition as an important fight in the process of Brazil's independence, viz. the battle of Jenipapo, which occurred in the village of Campo Maior (PI, in the northeastern region of Brazil, on the banks of the River Jenipapo on March 13, 1823. To this end, we approach the polyphonic and multiple work of social memory that takes place in the convergences and divergences between history, myth and tangible signs, as diffuse monuments, places of memory, in the city of Campo Maior (PI.
Paleomorphology of the upper part of the Macae formation, Namorado field, Campos basin; Paleomorfologia do intervalo superior da formacao Macae, Campo de Namorado, Bacia de Campos

Energy Technology Data Exchange (ETDEWEB)

Barboza, Eduardo Guimaraes [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Inst. de Geociencias. Programa de Pos-Graduacao em Geociencias; Tomazelli, Luiz Jose; Ayup-Zouain, Ricardo Norberto [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Inst. de Geociencias. Centro de Estudos de Geologia Costeira e Oceanica; Viana, Adriano Roessler [PETROBRAS, Rio de Janeiro, RJ (Brazil). Exploracao e Producao. Edificio Sede

2004-07-01

The Macae Formation (Late Albian-Turonian of the Campos Basin) is represented by a thick column of carbonate sediments whose deposition began soon after the evaporitic phase that marks the beginning of the marine occupation of the basin. The top of this interval is represented by an unconformity (Type I), indicative of a variation in the base level of the basin, on which the turbidities of the basal sequence of the Namorado Field were deposited. For a better understanding of the depositional geometry of these turbidities, the paleogeomorphology analysis demonstrated to be quite efficient. The method of work used for so was a combination among the seismic 3D visualization (VoxelGeo{sup R}), from the characterization of different physical attributes of the seismic signal, and the facies analysis of wells profiles of the referred field. The developed analysis allowed the individualization and the three-dimensional visualization of a sinuous paleochannel in the top of the interval, until then not described in previous interpretations of this depositional system. With the information coming from this study, a better understanding of the genesis of this accumulation can be reached, especially in the part regarding to the units of important economic character, represented by the turbidities deposits and whose occurrences are related with stages of relative lowering of the sea level. (author)

FORMACIÓN INICIAL DE DOCENTES A DISTANCIA DENTRO DEL CAMPO DE LA EDUCACION EN COLOMBIA

Directory of Open Access Journals (Sweden)

Gloria Liliana Moreno Vizcaíno

2014-01-01

Full Text Available Este ensayo presenta una reflexión sobre la formación inicial de docentes a distancia dentro del campo de la educación en Colombia, principalmente desde la teoría de Pierre Bourdieu. La profesionalización del magisterio en Colombia ha sido un punto fundamental en la agenda educativa nacional, siendo las tres últimas décadas del siglo XX coyunturales para desarrollo de la metodología a distancia en programas de formación inicial docente a nivel universitario. A partir de entonces, la formación inicial de docentes a distancia ha tenido un posicionamiento dentro del campo de la Educación Superior en Colombia, hecho que se ha constituido en un agente profundo de cambio en la educación nacional y que ha estado claramente permeado por el impacto de las tecnologías de información y de la comunicación, lo cual le ha permitido enmarcarse dentro de los nuevos desafíos que dicha formación requiere.
Uma ditadura contra a república: política econômica e poder político em Roberto Campos

OpenAIRE

Ricardo V. Silva

2006-01-01

O artigo examina o pensamento político de Roberto Campos entre meados das décadas de 1950 e 1970. Neste período, além de importantes funções governamentais, Campos dedicou-se intensamente à luta de idéias, publicando grande quantidade de artigos e ensaios. Será desenvolvida a hipótese de que o seu pensamento político aponta para a institucionalização de um sistema político de tipo autoritário como o mais adequado às condições culturais e políticas da sociedade brasileira. A principal caracter...
Análise do campo elétrico atmosférico durante tempo bom e distúrbios geofísicos

OpenAIRE

Anaya, José Carlos Tacza

2015-01-01

Neste trabalho de dissertação apresenta-se a capabilidade de uma nova rede de sensores para monitorar o campo elétrico atmosférico em vários locais na América do Sul. O objetivo principal é obter a curva diária do campo elétrico atmosférico de tempo bom. Para isto foram realizadas médias mensais, sazonais e anuais. Essa curva é comparada com a curva característica em Tempo Universal conhecida como a Curva de Carnegie, a qual é relacionada com as correntes fluindo no Circuito Elétrico Atmosfér...
Characterization of Rn-222 production in Campo do Cercado C/09 Pocos de Caldas, Minas Gerais State

International Nuclear Information System (INIS)

Pereira, E.B.

1977-01-01

A systematic study for correlating the Rn-222 escape with the main geochemical and mineralogical factors for understanding of some change processes from uranium deposits in Campo do Cercado C-09 in Pocos de Caldas, Minas Gerais State is described. (author)
The archaeological context of Levantine rock Art in Campo de Hellín (Albacete

Directory of Open Access Journals (Sweden)

Gabriel GARCÍA ATIÉNZAR

2012-03-01

Full Text Available This work explores the knowledge of human settlement and the Levantine rock Art in a specific geographical context. The spatial reading of these elements allows to present hypotheses on human communities that occupied lands of the Campo de Hellín (Albacete during the first phases of Holocene and how they built a landscape that reflects their social, economic and symbolic needs.
Nuclear reactor machine refuelling system

International Nuclear Information System (INIS)

Cashen, W.S.; Erwin, D.

1977-01-01

Part of an on-line fuelling machine for a CANDU pressure-tube reactor is described. The present invention provides a refuelling machine wherein the fuelling components, including the fuel carrier and the closure adapter, are positively positioned and retained within the machine magazine or positively secured to the machine charge tube head, and cannot be accidentally disengaged as in former practice. The positive positioning devices include an arcuate keeper plate. Simplified hooked fingers are used. (NDH)
Machine Translation Effect on Communication

DEFF Research Database (Denmark)

Jensen, Mika Yasuoka; Bjørn, Pernille

2011-01-01

Intercultural collaboration facilitated by machine translation has gradually spread in various settings. Still, little is known as for the practice of machine-translation mediated communication. This paper investigates how machine translation affects intercultural communication in practice. Based...... on communication in which multilingual communication system is applied, we identify four communication types and its’ influences on stakeholders’ communication process, especially focusing on establishment and maintenance of common ground. Different from our expectation that quality of machine translation results...
Machining of Complex Sculptured Surfaces

CERN Document Server

2012-01-01

The machining of complex sculptured surfaces is a global technological topic in modern manufacturing with relevance in both industrialized and emerging in countries particularly within the moulds and dies sector whose applications include highly technological industries such as the automotive and aircraft industry. Machining of Complex Sculptured Surfaces considers new approaches to the manufacture of moulds and dies within these industries. The traditional technology employed in the manufacture of moulds and dies combined conventional milling and electro-discharge machining (EDM) but this has been replaced with high-speed milling (HSM) which has been applied in roughing, semi-finishing and finishing of moulds and dies with great success. Machining of Complex Sculptured Surfaces provides recent information on machining of complex sculptured surfaces including modern CAM systems and process planning for three and five axis machining as well as explanations of the advantages of HSM over traditional methods ra...
Formal modeling of virtual machines

Science.gov (United States)

Cremers, A. B.; Hibbard, T. N.

1978-01-01

Systematic software design can be based on the development of a 'hierarchy of virtual machines', each representing a 'level of abstraction' of the design process. The reported investigation presents the concept of 'data space' as a formal model for virtual machines. The presented model of a data space combines the notions of data type and mathematical machine to express the close interaction between data and control structures which takes place in a virtual machine. One of the main objectives of the investigation is to show that control-independent data type implementation is only of limited usefulness as an isolated tool of program development, and that the representation of data is generally dictated by the control context of a virtual machine. As a second objective, a better understanding is to be developed of virtual machine state structures than was heretofore provided by the view of the state space as a Cartesian product.
Estudio de la eficiencia operativa de las bombas eléctricas sumergibles (bes) en el campo v.h.r. en base a las curvas de operación

OpenAIRE

Román, Héctor; Ruiz, Christian

2009-01-01

Dada la gran necesidad de incrementar la producción en el distrito Amazónico, se propuso realizar un estudio de la eficiencia operativa de las bombas electrosumergible en el campo, en el cual se recopila toda la información relacionada con las bombas del campo, análisis de la información y determinación de posibles soluciones a las deficiencias operativas que permitan optimizar el proceso y obtener mayor producción de petróleo en el campo, que será de gran beneficio para la empresa y el país...
Design Control Systems of Human Machine Interface in the NTVS-2894 Seat Grinder Machine to Increase the Productivity

Science.gov (United States)

Ardi, S.; Ardyansyah, D.

2018-02-01

In the Manufacturing of automotive spare parts, increased sales of vehicles is resulted in increased demand for production of engine valve of the customer. To meet customer demand, we carry out improvement and overhaul of the NTVS-2894 seat grinder machine on a machining line. NTVS-2894 seat grinder machine has been decreased machine productivity, the amount of trouble, and the amount of downtime. To overcome these problems on overhaul the NTVS-2984 seat grinder machine include mechanical and programs, is to do the design and manufacture of HMI (Human Machine Interface) GP-4501T program. Because of the time prior to the overhaul, NTVS-2894 seat grinder machine does not have a backup HMI (Human Machine Interface) program. The goal of the design and manufacture in this program is to improve the achievement of production, and allows an operator to operate beside it easier to troubleshoot the NTVS-2894 seat grinder machine thereby reducing downtime on the NTVS-2894 seat grinder machine. The results after the design are HMI program successfully made it back, machine productivity increased by 34.8%, the amount of trouble, and downtime decreased 40% decrease from 3,160 minutes to 1,700 minutes. The implication of our design, it could facilitate the operator in operating machine and the technician easer to maintain and do the troubleshooting the machine problems.
Permutation parity machines for neural synchronization

International Nuclear Information System (INIS)

Reyes, O M; Kopitzke, I; Zimmermann, K-H

2009-01-01

Synchronization of neural networks has been studied in recent years as an alternative to cryptographic applications such as the realization of symmetric key exchange protocols. This paper presents a first view of the so-called permutation parity machine, an artificial neural network proposed as a binary variant of the tree parity machine. The dynamics of the synchronization process by mutual learning between permutation parity machines is analytically studied and the results are compared with those of tree parity machines. It will turn out that for neural synchronization, permutation parity machines form a viable alternative to tree parity machines
A experiência num campo desconhecido: a instituição policial entendida por uma estudante de psicologia

Directory of Open Access Journals (Sweden)

Denise Fernanda de Lima Cavalcanti

Full Text Available O presente artigo pretende demonstrar minha experiência de estágio na disciplina de Psicologia do trabalho, realizado no ano de 2004, numa instituição policial de São Bernardo do Campo. O artigo é uma reflexão sobre a equipe de policiais que acompanhei a partir das observações e de uma análise crítica a respeito dos processos psicológicos nela envolvidos, que foi refletida junto à instituição e aos policiais. O estágio foi baseado na questão da saúde mental do trabalhador, procurando demonstrar os novos olhares da Psicologia sobre essa instituição e o amplo campo de atuação do psicólogo.
Manipulator for plasma-assisted machining of components made of materials with low machinability

International Nuclear Information System (INIS)

Lyaoshchukov, M.M.; Agadzhanyan, R.A.

1984-01-01

The All-Union Scientific-Research and Technological Institute of Pump Engineering developed, and the ''Uralgidromash'' Production Association has adopted, a manipulator with remote control for the plasma-assisted machining (PAM) of components made of materials with low machinability. The manipulator is distinguished by its universal design and can be used for machining both external and internal surfaces of the bodies of revolution and also end faces and various curvilinear surfaces
Raft tectonics in northern Campos Basin; Tectonica de jangada (raft tectonics) na area norte da Bacia de Campos

Energy Technology Data Exchange (ETDEWEB)

Castro, Marilia R. de [Universidade Estadual do Norte Fluminense (UENF), Campos dos Goytacases, RJ (Brazil)]|[PETROBRAS, Macae, RJ (Brazil). Unidade de Negocio da Bacia de Campos; Fugita, Adhemar M. [Universidade do Estado, Rio de Janeiro, RJ (Brazil). Programa de Recursos Humanos da ANP

2004-07-01

In the northern area of Campos Basin salt gliding/spreading processes promoted the break-up and transport of Cretaceous and Tertiary rocks overlying the evaporites. This process is known as raft tectonics, and it represents the most extreme form of thin-skinned extension above the salt decollement surface. Three distinct geotectonic domains were recognized that formed in response to the raft tectonics. The first one, confined to the shallower shelf portion of the basin, is characterized by minor extension (pre-raft domain), probably because of small salt thickness and low gradient. In the second domain (or disorganized rafts domain), located in distal platformal and slope areas, seismic sections show the occurrence of blocks or rafts with angular shapes, sometimes imbricated and frequently discontinuous. In the third domain, or domain of organized rafts, located in bacinal region, seismic sections show a more continuous raft pattern, often folded because of salt compression in the distal portions of the basin. The main purposes of this work is to characterize these three tectonic domains distinguished by raft tectonics, as well as their importance in hydrocarbon accumulations in calcarenites. (author)
From machine learning to deep learning: progress in machine intelligence for rational drug discovery.

Science.gov (United States)

Zhang, Lu; Tan, Jianjun; Han, Dan; Zhu, Hao

2017-11-01

Machine intelligence, which is normally presented as artificial intelligence, refers to the intelligence exhibited by computers. In the history of rational drug discovery, various machine intelligence approaches have been applied to guide traditional experiments, which are expensive and time-consuming. Over the past several decades, machine-learning tools, such as quantitative structure-activity relationship (QSAR) modeling, were developed that can identify potential biological active molecules from millions of candidate compounds quickly and cheaply. However, when drug discovery moved into the era of 'big' data, machine learning approaches evolved into deep learning approaches, which are a more powerful and efficient way to deal with the massive amounts of data generated from modern drug discovery approaches. Here, we summarize the history of machine learning and provide insight into recently developed deep learning approaches and their applications in rational drug discovery. We suggest that this evolution of machine intelligence now provides a guide for early-stage drug design and discovery in the current big data era. Copyright © 2017 Elsevier Ltd. All rights reserved.
29 CFR 1910.218 - Forging machines.

Science.gov (United States)

2010-07-01

... 29 Labor 5 2010-07-01 2010-07-01 false Forging machines. 1910.218 Section 1910.218 Labor... OCCUPATIONAL SAFETY AND HEALTH STANDARDS Machinery and Machine Guarding § 1910.218 Forging machines. (a... other identifier, for the forging machine which was inspected. (ii) Scheduling and recording the...
The achievements of the Z-machine

International Nuclear Information System (INIS)

Larousserie, D.

2008-01-01

The ZR-machine that represents the latest generation of Z-pinch machines has recently begun preliminary testing before its full commissioning in Albuquerque (Usa). During its test the machine has well operated with electrical currents whose intensities of 26 million Ampere are already 2 times as high as the intensity of the operating current of the previous Z-machine. In 2006 the Z-machine reached temperatures of 2 billions Kelvin while 100 million Kelvin would be sufficient to ignite thermonuclear fusion. In fact the concept of Z-pinch machines was imagined in the fifties but the technological breakthrough that has allowed this recent success and the reborn of Z-machine, was the replacement of gas by an array of metal wires through which the electrical current flows and vaporizes it creating an imploding plasma. It is not well understood why Z-pinch machines generate far more radiation than theoretically expected. (A.C.)
Vector control of induction machines

CERN Document Server

Robyns, Benoit

2012-01-01

After a brief introduction to the main law of physics and fundamental concepts inherent in electromechanical conversion, ""Vector Control of Induction Machines"" introduces the standard mathematical models for induction machines - whichever rotor technology is used - as well as several squirrel-cage induction machine vector-control strategies. The use of causal ordering graphs allows systematization of the design stage, as well as standardization of the structure of control devices. ""Vector Control of Induction Machines"" suggests a unique approach aimed at reducing parameter sensitivity for
The Chainstitch Machine. Module 18.

Science.gov (United States)

South Carolina State Dept. of Education, Columbia. Office of Vocational Education.

This module on the chainstitch machine, one in a series dealing with industrial sewing machines, their attachments, and operation, covers one topic: performing special operations on the chainstitch machine. These components are provided: an introduction, directions, an objective, learning activities, student information, a student self-check, and…

Machine Shop Fundamentals: Part I.

Science.gov (United States)

Kelly, Michael G.; And Others

These instructional materials were developed and designed for secondary and adult limited English proficient students enrolled in machine tool technology courses. Part 1 includes 24 lessons covering introduction, safety and shop rules, basic machine tools, basic machine operations, measurement, basic blueprint reading, layout, and bench tools.…
Machining dynamics fundamentals, applications and practices

CERN Document Server

Cheng, Kai

2008-01-01

Machining dynamics are vital to the performance of machine tools and machining processes in manufacturing. This book discusses the state-of-the-art applications, practices and research in machining dynamics. It presents basic theory, analysis and control methodology. It is useful for manufacturing engineers, supervisors, engineers and designers.
Investigation of permanent magnet machines for downhole applications: Design, prototype and testing of a flux-switching permanent magnet machine

Energy Technology Data Exchange (ETDEWEB)

Chen, Anyuan

2011-01-15

The current standard electrical downhole machine is the induction machine which is relatively inefficient. Permanent magnet (PM) machines, having higher efficiencies, higher torque densities and smaller volumes, have widely employed in industrial applications to replace conventional machines, but few have been developed for downhole applications due to the high ambient temperatures in deep wells and the low temperature stability of PM materials over time. Today, with the development of variable speed drives and the applications of high temperature magnet materials, it is increasingly interesting for oil and gas industries to develop PM machines for downhole applications. Recently, some PM machines applications have been presented for downhole applications, which are normally addressed on certain specific downhole case. In this thesis the focus has been put on the performance investigation of different PM machines for general downhole cases, in which the machine outer diameter is limited to be small by well size, while the machine axial length may be relatively long. The machine reliability is the most critical requirement while high torque density and high efficiency are also desirable. The purpose is to understand how the special constraints in downhole condition affect the performances of different machines. First of all, three basic machine concepts, which are the radial, axial and transverse flux machines, are studied in details by analytical method. Their torque density, efficiency, power factor and power capability are investigated with respect to the machine axial length and pole number. The presented critical performance comparisons of the machines provide an indication of machines best suitable with respect to performance and size for downhole applications. Conventional radial flux permanent magnet (RFPM) machines with the PMs on the rotor can provide high torque density and high efficiency. This type of machine has been suggested for several different
Electrical machining method of insulating ceramics

International Nuclear Information System (INIS)

Fukuzawa, Y.; Mohri, N.; Tani, T.

1999-01-01

This paper describes a new electrical discharge machining method for insulating ceramics using an assisting electrode with either a sinking electrical discharge machine or a wire electrical discharge machine. In this method, the metal sheet or mesh is attached to the ceramic surface as an assisting material for the discharge generation around the insulator surface. When the machining condition changes from the attached material to the workpiece, a cracked carbon layer is formed on the workpiece surface. As this layer has an electrical conductivity, electrical discharge occurs in working oil between the tool electrode and the surface of the workpiece. The carbon is formed from the working oil during this electrical discharge. Even after the material is machined, an electrical discharge occurs in the gap region between the tool electrode and the ceramic because an electrically conductive layer is generated continuously. Insulating ceramics can be machined by the electrical discharge machining method using the above mentioned surface modification phenomenon. In this paper the authors show a machined example demonstrating that the proposed method is available for machining a complex shape on insulating ceramics. Copyright (1999) AD-TECH - International Foundation for the Advancement of Technology Ltd
Identificación de síntomas espectrales asociados a problemas en grupos electro energéticos. // Spectral Symptom Identification Associated to Problems in Power Plant Machines.

Directory of Open Access Journals (Sweden)

J. Cabrera Gómez

2005-01-01

Full Text Available La aplicación de estrategias de mantenimiento predictivo es una de las tendencias actuales en las centrales generadoras deenergía eléctrica. Las acciones predictivas se fundamentan en el monitorado y control del estado de las máquinas, jugandoen este sentido la medición y análisis de las vibraciones un rol preponderante. El trabajo muestra, tomando como base ungran número de mediciones de campo realizadas, la forma en que se reflejan en los espectros de las vibraciones registradasvarios de los principales problemas que pueden presentar estas máquinas durante su funcionamiento.Palabras claves: Vibraciones mecánicas, fuerzas excitadoras, resonancias, comportamiento dinámico,espectro de vibraciones, mantenimiento predictivo._________________________________________________________________________________Abstract.The application of predictive maintenance strategies is an actual trend in power plants. Predictive actions are based onmachine condition monitoring, and vibration measurements and analysis play a prevailing role in order to control themachine condition. Based on a large number of vibration measurements made on real machines, this paper shows howdifferent problems in these machines during operation are identified in vibration spectra.Key words: Mechanical vibrations, exciting forces, resonances, dynamic behaviour, vibration spectrum,predictive maintenance.
Advanced SLARette delivery machine

International Nuclear Information System (INIS)

Bodner, R.R.

1995-01-01

SLARette 1 equipment, comprising of a SLARette Delivery Machine, SLAR Tools, SLAR power supplies and SLAR Inspection Systems was designed, developed and manufactured to service fuel channels of CANDU 6 stations during the regular yearly station outages. The Mark 2 SLARette Delivery Machine uses a Push Tube system to provide the axial and rotary movements of the SLAR Tool. The Push Tubes are operated remotely but must be attached and removed manually. Since this operation is performed at the Reactor face, there is radiation dose involved for the workers. An Advanced SLARette Delivery Machine which incorporates a computer controlled telescoping Ram in the place of the Push Tubes has been recently designed and manufactured. Utilization of the Advanced SLARette Delivery Machine significantly reduces the amount of radiation dose picked up by the workers because the need to have workers at the face of the Reactor during the SLARette operation is greatly reduced. This paper describes the design, development and manufacturing process utilized to produce the Advanced SLARette Delivery Machine and the experience gained during the Gentilly-2 NGS Spring outage. (author)
Modification of structural graphite machining

International Nuclear Information System (INIS)

Lavrenev, M.M.

1979-01-01

Studied are machining procedures for structural graphites (GMZ, MG, MG-1, PPG) most widely used in industry, of the article mass being about 50 kg. Presented are dependences necessary for the calculation of cross sections of chip suction tappers and duster pipelines in machine shops for structural graphite machining
A poética da tradução em Walter Benjamin e Haroldo de Campos

Directory of Open Access Journals (Sweden)

Luciene Guimarães de Oliveira

2005-04-01

Full Text Available Este ensaio visa traçar um paralelo entre a poética da tradução de Walter Benjamin, em “A Tarefa do Tradutor”, e a de Haroldo de Campos, poeta, tradutor, e crítico brasileiro em sua teoria da tradução.
Machines and Metaphors

Directory of Open Access Journals (Sweden)

Ángel Martínez García-Posada

2016-10-01

Full Text Available The edition La ley del reloj. Arquitectura, máquinas y cultura moderna (Cátedra, Madrid, 2016 registers the useful paradox of the analogy between architecture and technique. Its author, the architect Eduardo Prieto, also a philosopher, professor and writer, acknowledges the obvious distance from machines to buildings, so great that it can only be solved using strange comparisons, since architecture does not move nor are the machines habitable, however throughout the book, from the origin of the metaphor of the machine, with clarity in his essay and enlightening erudition, he points out with certainty some concomitances of high interest, drawing throughout history a beautiful cartography of the fruitful encounter between organics and mechanics.
Técnicas constructivas en las termas romanas dé Campo Valdés (Gijón: el material latericio

Directory of Open Access Journals (Sweden)

Fernández Ochoa, Carmen

1996-12-01

Full Text Available In this paper we analyze the use of lateres coctiles in the building of the Roman baths at Campo Valdés in Gijón (Spain. This study is meant as contribution to the knowledge of Roman building techniques in general and, as a print of detail, to the knowledge of bath building techniques and materials.Se aborda en este trabajo el análisis del empleo de lateres coctiles en la construcción de las termas romanas de Campo Valdés (Gijón. Este estudio es una contribución al conocimiento de la edilicia hispanorromana en general y, de manera particular, al de la técnica constructiva en los complejos termales.
EL PAPEL DE LA PRÁCTICA DE CAMPO EN EL CONTEXTO FORMATIVO DE LA EDUCACIÓN SUPERIOR EN CUBA

Directory of Open Access Journals (Sweden)

Kendry Garcés Ramírez

2016-04-01

Full Text Available Con la introducción del plan de estudio D se retomó la concepción de las prácticas de campo, actividad teórico-práctica necesaria en el perfil de la carrera Licenciatura en Educación, especialidad Biología-Geografía. El presente artículo aborda referentes sobre la eficacia de la práctica de campo en el contexto formativo de la Educación Superior en Cuba, su papel en el proceso de formación inicial y su importancia en la formación integral del estudiante, el fortalecimiento de valores, la motivación por la profesión y el desarrollo de una cultura ambiental responsable.
OptiCentric lathe centering machine

Science.gov (United States)

Buß, C.; Heinisch, J.

2013-09-01

High precision optics depend on precisely aligned lenses. The shift and tilt of individual lenses as well as the air gap between elements require accuracies in the single micron regime. These accuracies are hard to meet with traditional assembly methods. Instead, lathe centering can be used to machine the mount with respect to the optical axis. Using a diamond turning process, all relevant errors of single mounted lenses can be corrected in one post-machining step. Building on the OptiCentric® and OptiSurf® measurement systems, Trioptics has developed their first lathe centering machines. The machine and specific design elements of the setup will be shown. For example, the machine can be used to turn optics for i-line steppers with highest precision.
O imaginário rural do leitor urbano: o sonho mítico da casa no campo

Directory of Open Access Journals (Sweden)

Gislene Silva

2009-06-01

Full Text Available Esta pesquisa procura compreender um fenômeno aparentemente comum: o sonho de muitos moradores urbanos em ter uma casa no campo. A investigação é feita junto aos leitores da revista Globo Rural, uma publicação especializada em atividades agrícolas. São assinantes que residem na cidade de São Paulo e não possuem nenhum tipo de propriedade no meio rural. O propósito deste estudo é tentar apreender os movimentos desse imaginário, contribuindo para o debate das conexões entre campo e cidade e para o entendimento da interação entre sujeitos e produtos culturais simbólicos, no cotidiano urbano contemporâneo. Diante da complexa relação do homem com a natureza e da condição histórica vivida numa metrópole nesta virada de século, percebe-se que, ao sonhar com a casa no campo, os leitores urbanos da revista não apenas se voltam de maneira saudosa para o passado rural. No tempo presente, eles tecem uma crítica profunda ao modelo civilizatório da urbanidade da metrópole e, olhando para frente, imaginam um futuro melhor fora da cidade, no meio rural, mais perto das coisas da natureza, num lugar mais solidário, longe da violência, do trânsito pesado, da poluição e com mais qualidade de vida.
Machine Shop Grinding Machines.

Science.gov (United States)

Dunn, James

This curriculum manual is one in a series of machine shop curriculum manuals intended for use in full-time secondary and postsecondary classes, as well as part-time adult classes. The curriculum can also be adapted to open-entry, open-exit programs. Its purpose is to equip students with basic knowledge and skills that will enable them to enter the…
''Diagonalization'' of a compound Atwood machine

International Nuclear Information System (INIS)

Crawford, F.S.

1987-01-01

We consider a simple Atwood machine consisting of a massless frictionless pulley no. 0 supporting two masses m 1 and m 2 connected by a massless flexible string. We show that the string that supports massless pulley no. 0 ''thinks'' it is simply supporting a mass m 0 , with m 0 = 4m 1 m 2 /(m 1 +m 2 ). This result, together with Einstein's equivalence principle, allows us to solve easily those compound Atwood machines created by replacing one or both of m 1 and m 2 in machine no. 0 by an Atwood machine. We may then replacing the masses in these new machines by machines, etc. The complete solution can be written down immediately, without solving simultaneous equations. Finally we give the effective mass of an Atwood machine whose pulley has nonzero mass and moment of inertia
Tectonic inheritage from adjacent basement, north of the Campos Basin; Heranca tectonica no embasamento adjacente no norte da Bacia de Campos

Energy Technology Data Exchange (ETDEWEB)

Ferroni, Felipe R. [Universidade Estadual Paulista (UNESP), Rio Claro, SP (Brazil); Castro, Joel C. de [Universidade Estadual Paulista (UNESP), Rio Claro, SP (Brazil). Inst. de Geociencias e Ciencias Exatas. Dept. de Geologia Aplicada; Souza, Iata A. de; Castro, Joel C. de [Universidade Estadual Paulista (UNESP), Rio Claro, SP (Brazil). Inst. de Geociencias e Ciencias Exatas

2008-07-01

The evolution of the Atlantic Brazilian basins is a target of researches since the firth discovery of oil deposits. With the advance of the geophysical methods the understanding of the structures in depth became possible. The objective of this paper is to determine if the adjacent basement in the north of Campos Basin has significant influence in the identification of areas that can contain hydrocarbons. Therefore, lineaments had been extracted with SRTM images of continental basement and the main alignment was correlated with gravimetric anomalies map and seismic data. Eight levels on seismic data had been interpreted (basement, top rift, shallow water Albian, Albian, mid-Oligocene and mid-Miocene). In all levels were identified a fault normal system, which cut sediments since basement until the Recent. The main direction of the basement is NE-SW, and the alignments formed for basin basement faults coincide with this direction, what indicates that the system is active and also genetically related. (author)
Adaptive Machine Aids to Learning.

Science.gov (United States)

Starkweather, John A.

With emphasis on man-machine relationships and on machine evolution, computer-assisted instruction (CAI) is examined in this paper. The discussion includes the background of machine assistance to learning, the current status of CAI, directions of development, the development of criteria for successful instruction, meeting the needs of users,…
Machining of titanium alloys

CERN Document Server

2014-01-01

This book presents a collection of examples illustrating the resent research advances in the machining of titanium alloys. These materials have excellent strength and fracture toughness as well as low density and good corrosion resistance; however, machinability is still poor due to their low thermal conductivity and high chemical reactivity with cutting tool materials. This book presents solutions to enhance machinability in titanium-based alloys and serves as a useful reference to professionals and researchers in aerospace, automotive and biomedical fields.
Plasma Stability in Magnetic Mirror Machine with Stabilizing Rods; Stabilite du Plasma dans une Machine a Miroirs Magnetiques avec Barreaux de Stabilisation; Ustojchivost' plazmy v probkotrone so stabiliziruyushchimi sterzhnyami; Estabilidad del Plasma en una Trampa de Espejos con Barras Estabilizadoras

Energy Technology Data Exchange (ETDEWEB)

Trubnikov, B. A. [Institut Atomnoj Ehnergii Im. I.V. Kurchatova, Moskva, SSSR (Russian Federation)

1966-04-15

-Operator 1, ce qui est admissible pour les evaluations semi-quantitatives. ' Outre les barreaux de longueur infinie, l'auteur a examine des systemes a barreaux de stabilisation de longueur finie qui peuvent etre egalement realises a l'aide d'aimants multipolaires de longueur finie. Comme il le montre dans le memoire, on peut meme parvenir a une stabilisation dans le cas limite des barreaux tres courts, ou ces derniers peuvent etre consideres comme formant un systeme de 2n bipoles magnetiques ponctuels situes dans le plan central de la machine sur la peripherie d'un cercle de rayon a et orientes parallelement au rayon dans le sens oppose a l'axe (ou vers l'axe - les directions alternent). Ces systemes, que l'auteur a examines a la suite d'une suggestion de Artsimovitch peuvent se reveler tres utiles; en effet, leur structure facilite l'acces au plasma et permet d'installer des dispositifs complementaires pour son diagnostic ou son chauffage. (author) [Spanish] En esta memoria se amplia el criterio ya conocido Greek-Small-Letter-Delta {integral} Script-Small-L / B < 0 al caso de que los campos no tengan simetria axial. Para ello hay que expresarlo en la forma {integral}( Greek-Small-Letter-Delta B/B{sup 2}) (P{sub 0} + P{sub Up-Tack }) d Script-Small-L > 0; en donde Greek-Small-Letter-Delta B = s x {Delta}B es el incremento del modulo del campo sobre la linea de fuerza adyacente (exterior), siendo s Up-Tack B. Se aplica dicho criterio al estudio de la estabilidad del plasma en uria trampa de espejos con barras estabilizadoras. El campo, en las proximidades del eje, esta representado por el potencial escalar: {psi} = {integral} B{sub 0} (z) dz - B{sub 0}{sup 1} (z) r 2/4 + g (z) r{sup n} cos n{phi} mientras que para el campo en el eje mismo se utiliza la aproximacion parabolica B{sub 0}(z) = B{sub 0}{sup 0} (l + z{sup 2} /1{sup 2}). Si hay 2n barras, en cada una de las cuales la corriente es I, dispuestas en forma de circunferencia de radio a, teniendo en cuenta la pequenez de
Brain versus Machine Control.

Directory of Open Access Journals (Sweden)

Jose M Carmena

2004-12-01

Full Text Available Dr. Octopus, the villain of the movie "Spiderman 2", is a fusion of man and machine. Neuroscientist Jose Carmena examines the facts behind this fictional account of a brain- machine interface

Francisco Ferreira Saturnino Braga: negócios e fortuna em Campos dos Goytacazes

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Walter Luiz Carneiro de Mattos Pereira

2012-12-01

Full Text Available O artigo pretende investir no estudo da dinâmica da economia em Campos dos Goytacazes, Rio de Janeiro, nas duas décadas que antecedem a abolição da escravatura no Brasil, a partir dos negócios e da fortuna de Francisco Ferreira Saturnino Braga, proprietário de terras, escravos, usineiro, industrial, concessionário de ferrovias e banqueiro, figura-chave para se perceberem as transformações ocorridas em uma área de produção açucareira voltada para o mercado interno. As singularidades e particularidades obtidas pela observação em escala reduzida podem revelar a possibilidade de perceber uma articulação mais ampla com as estruturas de uma economia de mercado.The article intends to invest in the study of the dynamics of the economy in Campos dos Goytacazes, Rio de Janeiro, in the two decades preceding the abolition of slavery in Brazil, from the business and fortune of Francisco Ferreira Saturnino Braga, owner of land, slaves, mill owner, industrial, railroad dealer and banker, a key figure to understand the changes occurred in an area of the sugar production directs to the domestic market. The singularities and particularities obtained by observation in small scale may reveal the possibility of perceiving a broader articulation with the structures of a market economy.
Magnetic nanoparticles for cancer therapy; Nanoparticulas magneticas para o tratamento do cancer

Energy Technology Data Exchange (ETDEWEB)

Bakuzis, Andris F. [Universidade Federal de Goias (UFG), Goiania, GO (Brazil). Instituto de Fisica

2014-07-01

Full text: Magnetic nanoparticles have been used in several biomedical applications, spanning from cell separation, early diagnosis of metastasis to even the treatment of cancer via magnetic hyperthermia (MH). This last technique consists in the increase of temperature of nanoparticles when their magnetic moments interact with a magnetic alternating field. This effect has been suggested as an innovative therapy to cancer treatment, due to the delivery of heat or therapeutic agents, such as drugs, genes, and others. In addition, several clinical studies has demonstrated synergetic effects between hyperthermia and radiotherapy [1]. This indicates a great therapeutic potential for this noninvasive and targeted technique. In this talk we will discuss results from the literature and from our own group in the treatment of cancer via magnetic hyperthermia. Several types of magnetic nanoparticles suggested for this application will be discussed, as well as the historical evolution of this procedure, which although suggested in the late 50' only recently was approved in Europe for treatment of humans with brain tumors. (author) [Portuguese] Full text: Nanoparticulas magneticas tem sido utilizadas em diversas aplicacoes biomedicas, desde a separacao de celulas, marcacao de celulas-tronco, diagnostico precoce de metastases ao tratamento do cancer via hipertermia magnetica (HM). Esta ultima tecnica consiste no aumento da temperatura de nanoparticulas quando seus momentos magneticos interagem de forma adequada com um campo magnetico alternado. Este efeito tem sido idealizado como uma nova terapia para o tratamento do cancro, seja via entrega seletiva de calor ou mesmo pela liberacao de farmacos, genes ou outros agentes terapeuticos por meio desta acao externa. Adicionalmente, diversos estudos clinicos tem demonstrado efeitos sinergicos entre a hipertermia e tecnicas tradicionais de tratamento oncologico, como quimioterapia e radioterapia. Isto indica um forte potencial
Modeling and identification of new complementary development opportunities in a Campos Basin offshore giant field; Modelagem e identificacao de novas oportunidades de desenvolvimento complementar de um campo gigante na Bacia de Campos

Energy Technology Data Exchange (ETDEWEB)

Gomes, Jose Adilson T.; Steagall, Daniel E.; Lorenzatto, Rudimar Andreis [PETROBRAS, Rio de Janeiro, RJ (Brazil)

2004-07-01

The objective of this paper is to present the methodology that has been used for the complementary development of the giant Marlin oil field in the Campos Basin, with the study of the opportunities of new wells and application of new technologies for the enhancement of production, recovery factor and the gain of reserves. This methodology is applied integrating geophysics, geology, engineering, planning and operation, containing: identification of the non drained areas, positioning of new locations, risk analysis, reduction risk analysis actions, production estimation, attractive location selection; conceptual well project with location of the well head, submarine layout, drilling program, multiphase flow curves; drilling schedule, completion, and production commencement; production forecasting with flux simulation using operational reality of the oil, gas, and water treatment production capacity; wells substitution and deviation criteria; project critical resources and preliminary economical evaluation including project risk. The obtained results were the optimization of the project portfolio of new wells considering the identification of new opportunities, schedule and entrance order of wells, helping also in the acquisitions of new data for reservoir risk reduction before project implementation. (author)
5-axes modular CNC machining center

Directory of Open Access Journals (Sweden)

Breaz Radu-Eugen

2017-01-01

Full Text Available The paper presents the development of a 5-axes CNC machining center. The main goal of the machine was to provide the students a practical layout for training in advanced CAM techniques. The mechanical structure of the machine was built in a modular way by a specialized company, which also implemented the CNC controller. The authors of this paper developed the geometric and kinematic model of the CNC machining center and the post-processor, in order to use the machine in a CAM environment.
Recycled residues: a new frontier to the citizenship; Residuos reciclaveis na Bacia de Campos: uma nova fronteira para a cidadania

Energy Technology Data Exchange (ETDEWEB)

Cunha, Joao Guilherme Ribeiro da [PETROBRAS, Rio de Janeiro, RJ (Brazil). CEMPRE - Compromisso Empresarial para Reciclagem

2004-07-01

The Selective Collection Program of the Campos Basin, implanted in May 1996, aims to devote adequately the recyclable waste generated at the site of PETROBRAS in the Campos Basin and the rescue environmental awareness with the practice of not wasting materials classified as recyclable. It is always to remember that education is the basis for everything and that the results of investments in environmental education be perceived slow, and takes time and perseverance. The structure of the Selective Collection Program consists of the separation of waste at source, transportation, segregation, storage and appropriate final destination. The PETROBRAS has important role in this context, reinforcing its compromise to quality of local communities life with social and environmental responsibility. (author)
15 CFR 5.5 - Vending machines.

Science.gov (United States)

2010-01-01

... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false Vending machines. 5.5 Section 5.5... machines. (a) The income from any vending machines which are located within reasonable proximity to and are... shall be assigned to the operator of such stand. (b) If a vending machine vends articles of a type...
78 FR 37789 - Juan Narcizo Oyervides-Campos, Inmate Number #86526-279, Correctional Institution Reeves I & II...

Science.gov (United States)

2013-06-24

... DEPARTMENT OF COMMERCE Bureau of Industry and Security Juan Narcizo Oyervides-Campos, Inmate... Order with the Under Secretary of Commerce for Industry and Security. The appeal must be filed within 45... the Internal Security Act of 1950 (50 U.S.C. 783(b)), or section 38 of the Arms Export Control Act (22...
An art history of machines?

Directory of Open Access Journals (Sweden)

Daniel Bridgman

2016-12-01

Full Text Available A toast offered in honor of Donald Preziosi on the cusp of his seventy-fifth birthday, this essay considers a range of machine metaphors, their art historical settings, and their implications. Addressing the mythography of Daedalus and his wonder machines in relation to art history’s machinic enterprises, an ancient art-archaeology seminar Preziosi directed at UCLA (in 1988 and the book, Rethinking Art History: Meditations on a Coy Science (1989 form the focus of my thinking about Preziosi’s work. At issue across the essay is the work of recursion, when machines make machines and in so doing create a recessive subjectivity for the maker. The essay ends with the speculation that art history’s disciplinary machinery may owe its generative strength to a perpetual need for replacement parts.
Machinability of Stellite 6 hardfacing

Directory of Open Access Journals (Sweden)

Dudzinski D.

2010-06-01

Full Text Available This paper reports some experimental findings concerning the machinability at high cutting speed of nickel-base weld-deposited hardfacings for the manufacture of hot tooling. The forging work involves extreme impacts, forces, stresses and temperatures. Thus, mould dies must be extremely resistant. The aim of the project is to create a rapid prototyping process answering to forging conditions integrating a Stellite 6 hardfacing deposed PTA process. This study talks about the dry machining of the hardfacing, using a two tips machining tool and a high speed milling machine equipped by a power consumption recorder Wattpilote. The aim is to show the machinability of the hardfacing, measuring the power and the tip wear by optical microscope and white light interferometer, using different strategies and cutting conditions.
Nontraditional machining processes research advances

CERN Document Server

2013-01-01

Nontraditional machining employs processes that remove material by various methods involving thermal, electrical, chemical and mechanical energy or even combinations of these. Nontraditional Machining Processes covers recent research and development in techniques and processes which focus on achieving high accuracies and good surface finishes, parts machined without burrs or residual stresses especially with materials that cannot be machined by conventional methods. With applications to the automotive, aircraft and mould and die industries, Nontraditional Machining Processes explores different aspects and processes through dedicated chapters. The seven chapters explore recent research into a range of topics including laser assisted manufacturing, abrasive water jet milling and hybrid processes. Students and researchers will find the practical examples and new processes useful for both reference and for developing further processes. Industry professionals and materials engineers will also find Nontraditional M...
Toroidal helical quartz forming machine

International Nuclear Information System (INIS)

Hanks, K.W.; Cole, T.R.

1977-01-01

The Scyllac fusion experimental machine used 10 cm diameter smooth bore discharge tubes formed into a simple toroidal shape prior to 1974. At about that time, it was discovered that a discharge tube was required to follow the convoluted shape of the load coil. A machine was designed and built to form a fused quartz tube with a toroidal shape. The machine will accommodate quartz tubes from 5 cm to 20 cm diameter forming it into a 4 m toroidal radius with a 1 to 5 cm helical displacement. The machine will also generate a helical shape on a linear tube. Two sets of tubes with different helical radii and wavelengths have been successfully fabricated. The problems encountered with the design and fabrication of this machine are discussed
Decomposition of the compound Atwood machine

Science.gov (United States)

Lopes Coelho, R.

2017-11-01

Non-standard solving strategies for the compound Atwood machine problem have been proposed. The present strategy is based on a very simple idea. Taking an Atwood machine and replacing one of its bodies by another Atwood machine, we have a compound machine. As this operation can be repeated, we can construct any compound Atwood machine. This rule of construction is transferred to a mathematical model, whereby the equations of motion are obtained. The only difference between the machine and its model is that instead of pulleys and bodies, we have reference frames that move solidarily with these objects. This model provides us with the accelerations in the non-inertial frames of the bodies, which we will use to obtain the equations of motion. This approach to the problem will be justified by the Lagrange method and exemplified by machines with six and eight bodies.
A Peer-Reviewed Journal about Machine Research

OpenAIRE

Cox, G; Ganesh, MI; Gil-Fournier, A; Herrie, MB; Hill, J; House, B; Jones, N; Skinner, S; Young, D; Anon

2017-01-01

Edited by Christian Ulrik Andersen and Geoff Cox This publication is about MACHINE RESEARCH – research on machines, research with machines, and research as a machine. It thus explores machinic perspectives to suggest a situation where the humanities are put into a critical perspective by machine driven ecologies, ontologies and epistemologies of thinking and acting. It aims to engage research and artistic practice that takes into account the new materialist conditions implied by nonhuman t...
Viscoelastic machine elements elastomers and lubricants in machine systems

CERN Document Server

MOORE, D F

2015-01-01

Viscoelastic Machine Elements, which encompass elastomeric elements (rubber-like components), fluidic elements (lubricating squeeze films) and their combinations, are used for absorbing vibration, reducing friction and improving energy use. Examplesinclude pneumatic tyres, oil and lip seals, compliant bearings and races, and thin films. This book sets out to show that these elements can be incorporated in machine analysis, just as in the case of conventional elements (e.g. gears, cogs, chaindrives, bearings). This is achieved by introducing elementary theory and models, by describing new an
Teletherapy machine

International Nuclear Information System (INIS)

Panyam, Vinatha S.; Rakshit, Sougata; Kulkarni, M.S.; Pradeepkumar, K.S.

2017-01-01

Radiation Standards Section (RSS), RSSD, BARC is the national metrology institute for ionizing radiation. RSS develops and maintains radiation standards for X-ray, beta, gamma and neutron radiations. In radiation dosimetry, traceability, accuracy and consistency of radiation measurements is very important especially in radiotherapy where the success of patient treatment is dependent on the accuracy of the dose delivered to the tumour. Cobalt teletherapy machines have been used in the treatment of cancer since the early 1950s and India had its first cobalt teletherapy machine installed at the Cancer Institute, Chennai in 1956
Creativity in Machine Learning

OpenAIRE

Thoma, Martin

2016-01-01

Recent machine learning techniques can be modified to produce creative results. Those results did not exist before; it is not a trivial combination of the data which was fed into the machine learning system. The obtained results come in multiple forms: As images, as text and as audio. This paper gives a high level overview of how they are created and gives some examples. It is meant to be a summary of the current work and give people who are new to machine learning some starting points.
The Complexity of Abstract Machines

Directory of Open Access Journals (Sweden)

Beniamino Accattoli

2017-01-01

Full Text Available The lambda-calculus is a peculiar computational model whose definition does not come with a notion of machine. Unsurprisingly, implementations of the lambda-calculus have been studied for decades. Abstract machines are implementations schema for fixed evaluation strategies that are a compromise between theory and practice: they are concrete enough to provide a notion of machine and abstract enough to avoid the many intricacies of actual implementations. There is an extensive literature about abstract machines for the lambda-calculus, and yet—quite mysteriously—the efficiency of these machines with respect to the strategy that they implement has almost never been studied. This paper provides an unusual introduction to abstract machines, based on the complexity of their overhead with respect to the length of the implemented strategies. It is conceived to be a tutorial, focusing on the case study of implementing the weak head (call-by-name strategy, and yet it is an original re-elaboration of known results. Moreover, some of the observation contained here never appeared in print before.
Urban forest and environmental inequality in Campos dos Goytacazes, Rio de Janeiro, Brazil

DEFF Research Database (Denmark)

Silva, Victor; Pedlowski, Marcos; Heynen, Nikolas

2002-01-01

Social and spatial inequality regarding environmental resources and services is one of most complex issues affecting contemporary urban life. The objective of this research is to study the spatial distribution of trees in public areas in Campos dos Goytacazes, Rio de Janeiro, Brazil. This researc...... and education levels of the population seem to play a more causal on tree quantity and species diversity. This inequality stresses a problem with environmental justice, a characteristic of Brazilian cities intrinsically connected to urban sustainability....
Desempenho operacional e custos de um trator na irrigação pós-plantio de eucalipto em campo

Directory of Open Access Journals (Sweden)

Danilo Simões

2012-04-01

Full Text Available O alto investimento em operações agroflorestais mecanizadas implica a definição segura de qual será a máquina mais preconizada para a otimização da operação, vinculada aos menores custos envolvidos. Este estudo teve como objetivo avaliar o desempenho operacional e econômico da operação silvicultural de irrigação pós-plantio de eucalipto a campo. A análise técnica englobou um estudo de tempos e movimentos e, a análise econômica, as variáveis do custo operacional, custo de produção e rendimento energético. Os resultados obtidos evidenciaram que, para áreas de reflorestamento de eucalipto em primeira e terceira rotação, não há uma diferença da capacidade de campo efetiva para a operação de irrigação pós-plantio. Em decorrência do dispêndio com tempos improdutivos, houve uma redução significativa na capacidade de campo operacional e, consequentemente, uma elevação no custo de produção.
On-machine measurement of a slow slide servo diamond-machined 3D microstructure with a curved substrate

International Nuclear Information System (INIS)

Zhu, Wu-Le; Yang, Shunyao; Ju, Bing-Feng; Jiang, Jiacheng; Sun, Anyu

2015-01-01

A scanning tunneling microscope-based multi-axis measuring system is specially developed for the on-machine measurement of three-dimensional (3D) microstructures, to address the quality control difficulty with the traditional off-line measurement process. A typical 3D microstructure of the curved compound eye was diamond-machined by the slow slide servo technique, and then the whole surface was on-machine scanned three-dimensionally based on the tip-tracking strategy by utilizing a spindle, two linear motion stages, and an additional rotary stage. The machined surface profile and its shape deviation were accurately measured on-machine. The distortion of imaged ommatidia on the curved substrate was distinctively evaluated based on the characterized points extracted from the measured surface. Furthermore, the machining errors were investigated in connection with the on-machine measured surface and its characteristic parameters. Through experiments, the proposed measurement system is demonstrated to feature versatile on-machine measurement of 3D microstructures with a curved substrate, which is highly meaningful for quality control in the fabrication field. (paper)

An asymptotical machine

Science.gov (United States)

Cristallini, Achille

2016-07-01

A new and intriguing machine may be obtained replacing the moving pulley of a gun tackle with a fixed point in the rope. Its most important feature is the asymptotic efficiency. Here we obtain a satisfactory description of this machine by means of vector calculus and elementary trigonometry. The mathematical model has been compared with experimental data and briefly discussed.
La investigación educativa en Chihuahua, campo de oportunidades

Directory of Open Access Journals (Sweden)

Jesús Adolfo Trujillo Holguín

2016-10-01

Full Text Available El crecimiento que experimenta el campo de la investigación educativa en el estado de Chihuahua, durante los últimos años, es notorio. Las y los investigadores locales ocupan espacios académicos en redes y grupos de investigación nacionales e internacionales, se incorporan al Sistema Nacional de Investigadores (SNI, compiten por recursos en programas públicos de apoyo a la investigación científica, participan en congresos y encuentros de investigación más allá de las fronteras estatales, organizan y promueven congresos para atraer investigadores de distintas latitudes, publican libros y artículos y –en suma– son protagonistas del quehacer investigativo del país.
El cuerpo infantil: campo de batalla moderno. Antioquia (1903-1930

Directory of Open Access Journals (Sweden)

CARLOS ARTURO OSPINA-CRUZ

2010-01-01

Full Text Available Este texto aborda temáticas relacionadas con la concepción de cuerpo existente para el primer cuarto de siglo XX en Antioquia,1 en momentos en los que este departamento intentaba acomodarse a los lineamientos instruccionistas nacionales de la Ley 39 de 1903 o Ley [Antonio José] Uribe de 1903. La degeneración racial, la instrucción como elemento regenerador y la higiene forman el entramado discursivo con el que intentamos realizar algunas comprensiones analíticas acerca de una nueva y moderna visibilidad del cuerpo infantil con proyecciones laborales. Hablamos de un cuerpo que, en el campo instruccionista, fue mirado con mayor énfasis para la educación física y para ser castigado modernamente.
Apparel Manufacturing (Course Outline), Industrial Single Needle Machines and Machine Practice: 9377.02.

Science.gov (United States)

Dade County Public Schools, Miami, FL.

This course includes a study of the industrial single needle machine, its principal parts, general care, threading, and basic skills in machine practice. Instructional materials include films, illustration, information sheets, and other materials. (CK)
Comparison Between a Reference Torque Standard Machine and a Deadweight Torque Standard Machine to BE Used in Torque Calibration

Science.gov (United States)

Meng, Feng; Zhang, Zhimin; Lin, Jing

The paper describes the reference torque standard machine with high accuracy and multifunction, developed by our institute, and introduces the structure and working principle of this machine. It has three main functions. The first function is the hydraulic torque wrench calibration function. The second function is torque multiply calibration function. The third function is reference torque standard machine function. We can calibrate the torque multipliers, hydraulic wrenches and transducers by this machine. A comparison experiment has been done between this machine and a deadweight torque standard machine. The consistency between the 30 kNm reference torque machine and the 2000 Nm dead-weight torque standard machine under the claimed uncertainties was verified.
DIFICULTADES EN LA APLICACIÓN DEL CÁLCULO DIFERENCIAL E INTEGRAL EN LA RESOLUCIÓN DE PROBLEMAS DE CAMPO ELÉCTRICO

OpenAIRE

Silvia Coello; Jorge Flores

2013-01-01

El propósito de este estudio fue el determinar los conceptos en acción y teoremas en acción que tienen los estudiantes cuando aplican el cálculo diferencial e integral en la resolución de problemas de campo eléctrico utilizando la teoría de los campos conceptuales de Vergnaud. Participaron en este estudio seis estudiantes registrados en un curso de física básico con cálculo en el tópico de electromagnetismo y que tiene como prerrequisito el cálculo diferencial y como correquisito el cálculo ...
Effect of machining fluid on the process performance of wire electrical discharge machining of nanocomposite ceramic

Directory of Open Access Journals (Sweden)

Zhang Chengmao

2015-01-01

Full Text Available Wire electric discharge machining (WEDM promise to be effective and economical techniques for the production of tools and parts from conducting ceramic blanks. However, the manufacturing of nanocomposite ceramics blanks with these processes is a long and costly process. This paper presents a new process of machining nanocomposite ceramics using WEDM. WEDM uses water based emulsion, polyvinyl alcohol and distilled water as the machining fluid. Machining fluid is a primary factor that affects the material removal rate and surface quality of WEDM. The effects of emulsion concentration, polyvinyl alcohol concentration and distilled water of the machining fluid on the process performance have been investigated.
Singer CNC sewing and embroidery machine

Directory of Open Access Journals (Sweden)

Lokodi Zsolt

2011-12-01

Full Text Available This paper presents the adaptation of a classic foot pedal operated Singer sewing machine to a computerized numerical control (CNC sewing and embroidery machine. This machine is composed of a Singer sewing machine and a two-degrees-of-freedom XY stage designed specifically for this application. The whole system is controlled from a PC using adequate CNC control software.
Occurrence of “Babesia" sp. in crossbred calves by diagnosis methods in Campos dos Goytacazes, RJ, Brazil Ocorrência de "Babesia" sp. em bezerros mestiços, por meio de testes sorológicos, em Campos dos Goytacazes, RJ, Brasil

Directory of Open Access Journals (Sweden)

Maria Angélica Vieira da Costa Pereira

2009-03-01

Full Text Available 305 dairy calves sera samples at different ages for a serological survey in order to determine antibodies serum prevalence against Babesisa bovis and Babesia bigemina in zebu cattle as well as the crossbreds in Campos dos Goytacazes, RJ, Brazil were collected. By Indirect Fluorescent Antibody Test (IFAT and Indirect Enzyme-Linked Immunoadsorbent Assay (ELISA data were analyzed. Positive serum dairy cattle average percentages indicated 90.20 and 90.50% for B. bovis and 88.20 and 78.70% for B. bigemina by IFAT and ELISA, respectively. Both B. bovis and B. bigemina tests agreement ratio were 98.00 and 61.00%. Serum prevalence showed that the region is enzootically considered stable for bovine babesiosis infection with high disease prevalence. In Campos dos Goytacazes region whose livestock activity has been noted as a second income supporting, the present study may be regarding as unpublished, at all.Com o objetivo de realizar um levantamento soroepidemiológico para B. bovis e B. bigemina em bezerros de raças zebuínas e seus cruzamentos no município de Campos dos Goytacazes, RJ, foram coletadas 305 amostras de soros de bezerros de diferentes faixas etárias de propriedades dedicadas à produção leiteira. Os dados foram analisados pelas técnicas de imunofluorescência indireta (IFI e prova de imunoadsorção enzimática (ELISA. As médias dos percentuais obtidos de bovinos com sorologia positiva para B. bovis e B. bigemina foram de 90,20 e 90,50% e de 88,20 e 78,70% para IFI e ELISA, respectivamente. O grau de concordância dos testes para B. bovis foi de 98,00% e o de B. bigemina, de 61,00%. A soroprevalência encontrada caracteriza esta região como uma área de estabilidade enzoótica para B. bovis, com índice elevado na prevalência de portadores de Babesia sp. O presente trabalho é inédito na região de Campos dos Goytacazes, que tem a pecuária como segunda fonte de renda.
Automating horizontal boring and milling machine

International Nuclear Information System (INIS)

Naqvi, S.A.R.; Mahmood, T.; Choudhry, M.A.; Hanif, A.

2012-01-01

Aiming at the requirements of modification for many old import machine tools in industry, the schemes suited to the renovation are presented in this paper. A horizontal boring and milling machine (HBM) involved in machining of tank Al-Khalid has been modified using Mitsubishi FX-1N and FX-2N PLC. The developed software is for control of all the functions of the said machine. These functions include power on/off oil pump, spindle rotation and machine movement in all axes. All the decisions required by the machine for actuation of instructions are based on the data acquired from the control panel, timers and limit switches. Also the developed software minimize the down time, safety of operator and error free actuation of instructions. (author)
Molecular machines with bio-inspired mechanisms.

Science.gov (United States)

Zhang, Liang; Marcos, Vanesa; Leigh, David A

2018-02-26

The widespread use of molecular-level motion in key natural processes suggests that great rewards could come from bridging the gap between the present generation of synthetic molecular machines-which by and large function as switches-and the machines of the macroscopic world, which utilize the synchronized behavior of integrated components to perform more sophisticated tasks than is possible with any individual switch. Should we try to make molecular machines of greater complexity by trying to mimic machines from the macroscopic world or instead apply unfamiliar (and no doubt have to discover or invent currently unknown) mechanisms utilized by biological machines? Here we try to answer that question by exploring some of the advances made to date using bio-inspired machine mechanisms.
Sistema de sincronismo entre a colhedora de cana-de-açúcar e o veículo de transbordo System of synchronism between sugar cane harvest machine and infield wagon

Directory of Open Access Journals (Sweden)

Paulo S. G. Magalhães

2008-06-01

Full Text Available Um dos problemas encontrados na colheita mecanizada da cana-de-açúcar é a falta de sincronismo entre a colhedora e o transbordo, ocasionando perdas tanto de material como de capacidade operacional. A presente pesquisa teve como objetivo desenvolver um sistema capaz de auxiliar no sincronismo entre a colhedora e o veículo de transbordo por meio de comunicação sem fio. Dois sensores de ultra-som acoplados ao elevador e um microprocessador gerenciam tais informações, gerando correta sincronia entre as máquinas. O sistema foi testado em laboratório e em campo, cumprindo corretamente a função de manter as máquinas em sincronia, indicando e alertando aos operadores as suas posições relativas. O sistema desenvolvido reduziu as perdas de rebolo em cerca de 60 kg ha-1, comparado com a colheita realizada com o sistema desligado.One of the problems found in mechanical harvest of sugar cane is the lack of synchronism between the harvest machine and the infield wagon, causing crop losses as well as operational capacity. The objective of the present research was to design a system capable of helping to synchronize the sugar cane harvest machine with the wagon. The communication between tractor and harvest machine is wireless. Two ultrasound sensors coupled to the elevator and a microprocessor manage such information, generating a correct synchronization among the machines. The system was tested in laboratory and on field performing its function adequately, maintaining the two machines in synchronization, indicating and alerting the operators their relative positions. The developed system reduced the sugar cane lost in 60 kg ha-1 comparing to the harvest with the system turned off.
Geração Digital: uma reflexão sobre as relações da “juventude digital” e os campos da comunicação e da cultura

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Juliano Ferreira De Sousa

2014-07-01

Full Text Available O presente artigo trata de um levantamento bibliográfico sobre o conceito de campo da comunicação e cultura, a partir dos conceitos de Bourdieu e sobre as características do Pós-modernismo no campo cultural da produção, difusão e crítica. Também será apresentada a definição de Geração Digital, para descrever a maneira como o jovem, que cresceu com o advento da tecnologia e da internet, enxerga o campo da cultura e como se dão as relações do campo com esse público. Utilizando como base de análise as teorias de Don Tapscott, traremos dados oficiais da difusão da digitalização no país e apresentaremos os resultados de um questionário de verificação aplicado para membros da chamada juventude digital.
Model-based machine learning.

Science.gov (United States)

Bishop, Christopher M

2013-02-13

Several decades of research in the field of machine learning have resulted in a multitude of different algorithms for solving a broad range of problems. To tackle a new application, a researcher typically tries to map their problem onto one of these existing methods, often influenced by their familiarity with specific algorithms and by the availability of corresponding software implementations. In this study, we describe an alternative methodology for applying machine learning, in which a bespoke solution is formulated for each new application. The solution is expressed through a compact modelling language, and the corresponding custom machine learning code is then generated automatically. This model-based approach offers several major advantages, including the opportunity to create highly tailored models for specific scenarios, as well as rapid prototyping and comparison of a range of alternative models. Furthermore, newcomers to the field of machine learning do not have to learn about the huge range of traditional methods, but instead can focus their attention on understanding a single modelling environment. In this study, we show how probabilistic graphical models, coupled with efficient inference algorithms, provide a very flexible foundation for model-based machine learning, and we outline a large-scale commercial application of this framework involving tens of millions of users. We also describe the concept of probabilistic programming as a powerful software environment for model-based machine learning, and we discuss a specific probabilistic programming language called Infer.NET, which has been widely used in practical applications.
Reactor refueling machine simulator

International Nuclear Information System (INIS)

Rohosky, T.L.; Swidwa, K.J.

1987-01-01

This patent describes in combination: a nuclear reactor; a refueling machine having a bridge, trolley and hoist each driven by a separate motor having feedback means for generating a feedback signal indicative of movement thereof. The motors are operable to position the refueling machine over the nuclear reactor for refueling the same. The refueling machine also has a removable control console including means for selectively generating separate motor signals for operating the bridge, trolley and hoist motors and for processing the feedback signals to generate an indication of the positions thereof, separate output leads connecting each of the motor signals to the respective refueling machine motor, and separate input leads for connecting each of the feedback means to the console; and a portable simulator unit comprising: a single simulator motor; a single simulator feedback signal generator connected to the simulator motor for generating a simulator feedback signal in response to operation of the simulator motor; means for selectively connecting the output leads of the console to the simulator unit in place of the refueling machine motors, and for connecting the console input leads to the simulator unit in place of the refueling machine motor feedback means; and means for driving the single simulator motor in response to any of the bridge, trolley or hoist motor signals generated by the console and means for applying the simulator feedback signal to the console input lead associated with the motor signal being generated by the control console
The Bearingless Electrical Machine

Science.gov (United States)

Bichsel, J.

1992-01-01

Electromagnetic bearings allow the suspension of solids. For rotary applications, the most important physical effect is the force of a magnetic circuit to a high permeable armature, called the MAXWELL force. Contrary to the commonly used MAXWELL bearings, the bearingless electrical machine will take advantage of the reaction force of a conductor carrying a current in a magnetic field. This kind of force, called Lorentz force, generates the torque in direct current, asynchronous and synchronous machines. The magnetic field, which already exists in electrical machines and helps to build up the torque, can also be used for the suspension of the rotor. Besides the normal winding of the stator, a special winding was added, which generates forces for levitation. So a radial bearing, which is integrated directly in the active part of the machine, and the motor use the laminated core simultaneously. The winding was constructed for the levitating forces in a special way so that commercially available standard ac inverters for drives can be used. Besides wholly magnetic suspended machines, there is a wide range of applications for normal drives with ball bearings. Resonances of the rotor, especially critical speeds, can be damped actively.
Quantum cloning machines and the applications

Energy Technology Data Exchange (ETDEWEB)

Fan, Heng, E-mail: hfan@iphy.ac.cn [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Collaborative Innovation Center of Quantum Matter, Beijing 100190 (China); Wang, Yi-Nan; Jing, Li [School of Physics, Peking University, Beijing 100871 (China); Yue, Jie-Dong [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Shi, Han-Duo; Zhang, Yong-Liang; Mu, Liang-Zhu [School of Physics, Peking University, Beijing 100871 (China)

2014-11-20

No-cloning theorem is fundamental for quantum mechanics and for quantum information science that states an unknown quantum state cannot be cloned perfectly. However, we can try to clone a quantum state approximately with the optimal fidelity, or instead, we can try to clone it perfectly with the largest probability. Thus various quantum cloning machines have been designed for different quantum information protocols. Specifically, quantum cloning machines can be designed to analyze the security of quantum key distribution protocols such as BB84 protocol, six-state protocol, B92 protocol and their generalizations. Some well-known quantum cloning machines include universal quantum cloning machine, phase-covariant cloning machine, the asymmetric quantum cloning machine and the probabilistic quantum cloning machine. In the past years, much progress has been made in studying quantum cloning machines and their applications and implementations, both theoretically and experimentally. In this review, we will give a complete description of those important developments about quantum cloning and some related topics. On the other hand, this review is self-consistent, and in particular, we try to present some detailed formulations so that further study can be taken based on those results.
Quantum cloning machines and the applications

International Nuclear Information System (INIS)

Fan, Heng; Wang, Yi-Nan; Jing, Li; Yue, Jie-Dong; Shi, Han-Duo; Zhang, Yong-Liang; Mu, Liang-Zhu

2014-01-01

No-cloning theorem is fundamental for quantum mechanics and for quantum information science that states an unknown quantum state cannot be cloned perfectly. However, we can try to clone a quantum state approximately with the optimal fidelity, or instead, we can try to clone it perfectly with the largest probability. Thus various quantum cloning machines have been designed for different quantum information protocols. Specifically, quantum cloning machines can be designed to analyze the security of quantum key distribution protocols such as BB84 protocol, six-state protocol, B92 protocol and their generalizations. Some well-known quantum cloning machines include universal quantum cloning machine, phase-covariant cloning machine, the asymmetric quantum cloning machine and the probabilistic quantum cloning machine. In the past years, much progress has been made in studying quantum cloning machines and their applications and implementations, both theoretically and experimentally. In this review, we will give a complete description of those important developments about quantum cloning and some related topics. On the other hand, this review is self-consistent, and in particular, we try to present some detailed formulations so that further study can be taken based on those results
Programa Mais Educação: impactos e perspectivas nas escolas do campo

Directory of Open Access Journals (Sweden)

Cláudia da Mota Darós Parente

2017-08-01

Full Text Available This study aims to analyze the impacts of the “Mais Educação” Program in Brazilian countryside schools, with reflections on the limits and possibilities of the program and full-time education. Information was collected through electronic questionnaires sent to public schools participating in the “Mais Educação” Program. The research considered different aspects: expanding the school day; record of full-time enrollments in the school census; provision of human, educational and financial resources; changes in available spaces; provision of educational, cultural, artistic and sports activities; improvement in the communication process with the community; providing continuing education; changes in the political-pedagogical project and the school curriculum; changes in student behavior; improvement in school performance; improvement in the quality of school meals; development of partnerships; use of other available spaces. Through a quantitative and qualitative analysis, we identified significant impacts of the program in the countryside schools, especially with regard to the expansion of educational opportunities. However, the achieved benefits occur among the historical problems present in the countryside schools that were not overcome by virtue of the “Mais Educação” Program format and depend on the consideration of local governments (states, municipalities and Federal District. It presents reflections on the limits and possibilities of the “Mais Educação” Program and full-time education in the Brazilian countryside schools. O presente trabalho tem como objetivo analisar os impactos do Programa Mais Educação nas escolas do campo brasileiras, apresentando reflexões sobre limites e possibilidades do programa e da educação em tempo integral. Os dados foram coletados por meio de questionários eletrônicos enviados às escolas públicas participantes do Programa Mais Educação. A pesquisa considerou diferentes aspectos
EDM machinability of SiCw/Al composites

Science.gov (United States)

Ramulu, M.; Taya, M.

1989-01-01

Machinability of high temperature composites was investigated. Target materials, 15 and 25 vol pct SiC whisker-2124 aluminum composites, were machined by electrodischarge sinker machining and diamond saw. The machined surfaces of these metal matrix composites were examined by SEM and profilometry to determine the surface finish. Microhardness measurements were also performed on the as-machined composites.

Machine learning and medical imaging

CERN Document Server

Shen, Dinggang; Sabuncu, Mert

2016-01-01

Machine Learning and Medical Imaging presents state-of- the-art machine learning methods in medical image analysis. It first summarizes cutting-edge machine learning algorithms in medical imaging, including not only classical probabilistic modeling and learning methods, but also recent breakthroughs in deep learning, sparse representation/coding, and big data hashing. In the second part leading research groups around the world present a wide spectrum of machine learning methods with application to different medical imaging modalities, clinical domains, and organs. The biomedical imaging modalities include ultrasound, magnetic resonance imaging (MRI), computed tomography (CT), histology, and microscopy images. The targeted organs span the lung, liver, brain, and prostate, while there is also a treatment of examining genetic associations. Machine Learning and Medical Imaging is an ideal reference for medical imaging researchers, industry scientists and engineers, advanced undergraduate and graduate students, a...
Fundamentals of machine design

CERN Document Server

Karaszewski, Waldemar

2011-01-01

A forum of researchers, educators and engineers involved in various aspects of Machine Design provided the inspiration for this collection of peer-reviewed papers. The resultant dissemination of the latest research results, and the exchange of views concerning the future research directions to be taken in this field will make the work of immense value to all those having an interest in the topics covered. The book reflects the cooperative efforts made in seeking out the best strategies for effecting improvements in the quality and the reliability of machines and machine parts and for extending
Machine Learning for Hackers

CERN Document Server

Conway, Drew

2012-01-01

If you're an experienced programmer interested in crunching data, this book will get you started with machine learning-a toolkit of algorithms that enables computers to train themselves to automate useful tasks. Authors Drew Conway and John Myles White help you understand machine learning and statistics tools through a series of hands-on case studies, instead of a traditional math-heavy presentation. Each chapter focuses on a specific problem in machine learning, such as classification, prediction, optimization, and recommendation. Using the R programming language, you'll learn how to analyz
Vítimas da violência em Campo Grande: um retrato de seis anos revelado pelos dados oficiais Victims of violence in the city of Campo Grande: a six-year-picture revealed by official data

Directory of Open Access Journals (Sweden)

Sonia Maria Oliveira de Andrade

2008-09-01

Full Text Available O crescimento da violência no Brasil tem feito um número cada vez mais significativo de vítimas, incluindo as fatais, o que tem preocupado autoridades e profissionais, notadamente os da saúde. A busca de diagnóstico para a questão e de entendimento de seus fatores de risco em grupos específicos tem sido uma constante para pesquisadores em anos recentes. Em Campo Grande, a inexistência de informações com atribuição de significado provocou a realização de uma pesquisa para traçar o desenho da evolução da mortalidade por violência, considerando o período de 2002 a 2005. Foram utilizados dados secundários do Sistema de Informação de Mortalidade, a partir da Secretaria de Estado da Saúde de Mato Grosso do Sul, utilizando categorias do CID-10 referentes a agressão, excluindo-se a agressão autodirigida. Os resultados mostraram a magnitude do problema em Campo Grande, visto que afeta todos os grupos etários, com maior impacto na população masculina jovem. A agressão por arma de fogo, por objeto contundente e por objeto cortante e o uso da força corporal destacam-se. Torna-se urgente a identificação dos fatores desencadeantes desse tipo de violência, considerando-se os diferentes grupos, para que se possa agir preventivamente e de forma eficaz.The growth of violence in Brazil has been producing an increasingly significant number of victims, including fatal victims. This has worried authorities and professionals, mainly those in the health area. In recent years, researchers have been searching for the diagnosis of the question and for the understanding of its risk factors in specific groups. In the city of Campo Grande, state of Mato Grosso do Sul, the inexistence of information led to the conduction of a research study that aimed to outline the evolution of mortality caused by violent actions, in the period 2000-2005. We utilized data from the "Sistema de Informação de Mortalidade" (Mortality Information System, which
Conocimiento didáctico del contenido en la enseñanza del campo eléctrico

Directory of Open Access Journals (Sweden)

Jaime Duván Reyes Roncancio

2013-12-01

Full Text Available Este artículo presenta resultados de investigación correspondientes a la tesis doctoral en educación en ciencias titulada “Conocimiento Didáctico del Contenido (CDC en profesores de física en formación inicial: el caso de la enseñanza del campo eléctrico”. El enfoque metodológico cualitativo utilizado fundamentó la aplicación de una encuesta y una entrevista semiestructurada, así como el análisis de contenido del plan de aula de un profesor de física en el prácticum. La triangulación de la información obtenida a partir de estos instrumentos permitió constituir el caso de la enseñanza del campo eléctrico desde la caracterización del CDC del profesor de física, proceso en el cual se utiliza como referencia una matriz estilo hipótesis de progresión y el uso de metáforas.
Machine Learning for Medical Imaging.

Science.gov (United States)

Erickson, Bradley J; Korfiatis, Panagiotis; Akkus, Zeynettin; Kline, Timothy L

2017-01-01

Machine learning is a technique for recognizing patterns that can be applied to medical images. Although it is a powerful tool that can help in rendering medical diagnoses, it can be misapplied. Machine learning typically begins with the machine learning algorithm system computing the image features that are believed to be of importance in making the prediction or diagnosis of interest. The machine learning algorithm system then identifies the best combination of these image features for classifying the image or computing some metric for the given image region. There are several methods that can be used, each with different strengths and weaknesses. There are open-source versions of most of these machine learning methods that make them easy to try and apply to images. Several metrics for measuring the performance of an algorithm exist; however, one must be aware of the possible associated pitfalls that can result in misleading metrics. More recently, deep learning has started to be used; this method has the benefit that it does not require image feature identification and calculation as a first step; rather, features are identified as part of the learning process. Machine learning has been used in medical imaging and will have a greater influence in the future. Those working in medical imaging must be aware of how machine learning works. © RSNA, 2017.
Failure Identification of Hacksaw Machine REMOR 400

International Nuclear Information System (INIS)

Paidjo; Abdul Hafid; Sagino

2007-01-01

REMOR 400 Hack sawing machine is one of machines type has been old age. For arrange of cutting pressure and repeat lifting load after cutting process by using the hydraulic system. Beside of worn-out of hacksaw blade, failure cutting earn also because of leakage from the hydraulic system of machine. Leakage of hydraulic system occurs because of over load factor using or aging. Base on inspection result, hacksaw machine REMOR 400 fault on hydraulic system in the 2006 year. This matter will be seen from its seal brittle from the machine. For activate to return machine so much replacement repeat the seals used by machine. (author)
Permutation parity machines for neural cryptography.

Science.gov (United States)

Reyes, Oscar Mauricio; Zimmermann, Karl-Heinz

2010-06-01

Recently, synchronization was proved for permutation parity machines, multilayer feed-forward neural networks proposed as a binary variant of the tree parity machines. This ability was already used in the case of tree parity machines to introduce a key-exchange protocol. In this paper, a protocol based on permutation parity machines is proposed and its performance against common attacks (simple, geometric, majority and genetic) is studied.
Permutation parity machines for neural cryptography

International Nuclear Information System (INIS)

Reyes, Oscar Mauricio; Zimmermann, Karl-Heinz

2010-01-01

Recently, synchronization was proved for permutation parity machines, multilayer feed-forward neural networks proposed as a binary variant of the tree parity machines. This ability was already used in the case of tree parity machines to introduce a key-exchange protocol. In this paper, a protocol based on permutation parity machines is proposed and its performance against common attacks (simple, geometric, majority and genetic) is studied.
Las cartas olvidadas del astronauta; de Javier Campos: Una propuesta de lectura desde / para la Ciencia-Ficción.

Directory of Open Access Journals (Sweden)

Cristián Cisternas Ampuero

2016-03-01

Full Text Available El autor del ensayo se hace cargo de ciertos elementos temáticos propios de la Ciencia-Ficción y su importancia en el poemario "Las cartas olvidadas del astronauta" del poeta chileno Javier Campos, en orden a dilucidar tanto la condición existencial del hablante lírico como su visión del mundo, de la historia y del vínculo con el otro -la Amada-. The author of this essay takes charge of certain thematic elements proper to Science Fiction with theis particular importance in the Book of Poems "The Astronaut's Forgotten Letter" of the Chilean poet Javier Campos, in arder to elucidate the existential condition of the lyric voice in its world vision, its view of history and its relationship to the Other -the Beloved.
Salida de campo a Suances (Cantabria) el 27 y 28 de agosto de 1950

OpenAIRE

Valverde Gómez, José Antonio, 1926-2003

2008-01-01

Salida de campo a Suances, Cantabria, el 27 y 28 de agosto de 1950, de la que se anotaron observaciones sobre las siguientes aves: Actitis hypoleucos (Andarríos chico, llamado Actynioides hypoleucus por el autor), Arenaria interpres (Vuelvepiedras común), Calidris sp. (Correlimos), Carduelis cannabina (Pardillo común, llamada Colorín y Acanthis cannabina por el autor), Carduelis carduelis (Jilguero), Charadrius hiaticula (Chorlitejo grande), Corvus corax (Cuervo), Falco tinnunculus (Cernícalo...
Caracterização das vítimas de ferimentos por arma de fogo, atendidas pelo Serviço de Atendimento Móvel de Urgência em Campo Grande-MS Characterization of victims injured by firearms assisted by the Mobile Emergency Care Service in Campo Grande-MS

Directory of Open Access Journals (Sweden)

Simone Sanches

2009-03-01

Full Text Available A violência, em todas as suas apresentações, tem crescido de forma avassaladora no país, elevando os indicadores de morbidade e mortalidade por causas externas. O uso das armas de fogo, muitas vezes, faz vítimas fatais ou que podem permanecer sequeladas. Tal fato tem aumentado o ônus do estado com internações hospitalares e acréscimo dos anos de vida perdidos da população jovem, que constitui a grande maioria dessas vítimas. Nesse sentido, o presente estudo objetivou fazer um levantamento das vítimas de ferimentos por arma de fogo, atendidas pelo Serviço de Atendimento Móvel de Urgência no município de Campo Grande-MS, no período de abril de 2005 a abril de 2007, nos dois primeiros anos de funcionamento, desde a implantação desse serviço na capital do Estado de Mato Grosso do Sul. Realizou-se estudo descritivo, baseado em análise documental do sistema de informação do SAMU do município de Campo Grande-MS. Foram descritos 233 atendimentos. Os resultados evidenciaram 213 vítimas do sexo masculino, a faixa etária mais acometida foi dos 20 aos 24 anos de idade, a cabeça e o pescoço foram as partes do corpo mais atingidas e a região Sul do município de Campo Grande foi a que concentrou maior número de atendimentos. Conclui-se que a violência por arma de fogo em Campo Grande-MS atinge a camada economicamente ativa da população e provém de regiões de bolsões de pobreza e desigualdade social, justificando a implantação de um serviço como o SAMU.Violence has grown in an overwhelming way in Brazil, raising the indicators of morbidity and mortality by external causes. Many times, the use of firearms makes fatal victims or victims who may remain disabled. This fact has increased the State's onus regarding hospital costs and also the number of life years that the young population loses, as it forms the majority of the victims. The present study aimed to survey the victims of injuries caused by firearms, assisted by
Machine assembly with a new material handling mechanism in the sewing machine

Directory of Open Access Journals (Sweden)

Umarova Z.M.

2017-05-01

Full Text Available the paper presents the dynamic model of the machine assembly with a recommended mechanism for moving material and the definition of the law of rails motion under various system parameters. The author has suggested the solution implemented by the system of differential equations numerically on the PC and the system describing the motion of the machine set. Recommended values of the parameters of elastic links of material transfer mechanism have been obtained. The researcher has developed the methods of kinematic and dynamic analysis of the material transfer mechanism with elastic elements of the sewing machine and has approved the parameters and development of the design.
The Evolution of Population III Objects

Science.gov (United States)

de Araujo, J. C. N.; Opher, R.

1990-11-01

RESUMEN. Estudiamos el enfriamiento y colapso de las perturbaciones iso- termicas de masa M % Mj (masa de Jeans en la era de recombinaci6n) y M « Mj tomando en consideraci5n la expansi6n del Universo, presi6n, arrastre de fotones, enfriamiento de fotones (calentamiento), fotoioni- zaci6n, ionizaci5n por colisiones y la formaci6n y enfriamiento de mo- leculas de hidr6geno. Tambien estudiamos el efecto de no-esfericidad, rotaci6n y campos magneticos en el colapso de M % Mj debido a perturbaciones residuales que sobreviven para N « Mj. ABSTRACT. We study the cooling and collapse of isothermal perturbations of mass N % Nj (Jeans mass at recombination era) and N « NJ taking into account the expansion of the Universe, pressure, photon-drag, photon -cooling (heating), photoionization, collisional ionization and the formation and cooling of hydrogen molecules. We also study the effect of the nonsphericity, rotation and magnetic fields in the collapse of N % NJ. The formation of protostars from the fragmentation of clouds of mass M % MJ due to the residual perturbations that survive for N « NJ is also investigated. K ok : HYDRODYNANICS - STARS-POPULATION III
Abstract quantum computing machines and quantum computational logics

Science.gov (United States)

Chiara, Maria Luisa Dalla; Giuntini, Roberto; Sergioli, Giuseppe; Leporini, Roberto

2016-06-01

Classical and quantum parallelism are deeply different, although it is sometimes claimed that quantum Turing machines are nothing but special examples of classical probabilistic machines. We introduce the concepts of deterministic state machine, classical probabilistic state machine and quantum state machine. On this basis, we discuss the question: To what extent can quantum state machines be simulated by classical probabilistic state machines? Each state machine is devoted to a single task determined by its program. Real computers, however, behave differently, being able to solve different kinds of problems. This capacity can be modeled, in the quantum case, by the mathematical notion of abstract quantum computing machine, whose different programs determine different quantum state machines. The computations of abstract quantum computing machines can be linguistically described by the formulas of a particular form of quantum logic, termed quantum computational logic.
Nanocomposites for Machining Tools

DEFF Research Database (Denmark)

Sidorenko, Daria; Loginov, Pavel; Mishnaevsky, Leon

2017-01-01

Machining tools are used in many areas of production. To a considerable extent, the performance characteristics of the tools determine the quality and cost of obtained products. The main materials used for producing machining tools are steel, cemented carbides, ceramics and superhard materials...
Notas a la gaviota libertada en el campo, 31 de enero de 1951

OpenAIRE

Valverde Gómez, José Antonio, 1926-2003

2008-01-01

Notas a la Gaviota reidora (Larus ridibundus) libertada en el campo, cerca del Puente Colgante de Valladolid, el 31 de enero de 1951. Incluye observaciones de patos domésticos y Pavos reales (Pavo cristatus), y un pequeño esquema del enclave observado. Notes to the Common Black-headed Gull (Larus ridibundus) released in the field, near the Puente Colgante of Valladolid, the 31st of January of 1951. Observations of domestic ducks and Indian Peafowls (Pavo cristatus) and a little map of the ...
O professor de enfermagem: atuação em campo clínico

Directory of Open Access Journals (Sweden)

Marie Germaine Claire Lanthier

1984-03-01

Full Text Available O estudo procurou averiguar a opinião dos estudantes de enfermagem a respeito de determinados papéis desempenhados pelos professores em campo clínico, a fim de saber qual destes mais influencia na sua aprendizagem. Os três papéis escolhidos - Orientador Facilitador e Modelo - fundamentam-se nas três seguintes teorias: Bloom. Rogers e Bandura Os résultados entretanto, mais acentuada no grupo de estudantes que se acham nos últimos períodos do curso.
Machine intelligence and signal processing

CERN Document Server

Vatsa, Mayank; Majumdar, Angshul; Kumar, Ajay

2016-01-01

This book comprises chapters on key problems in machine learning and signal processing arenas. The contents of the book are a result of a 2014 Workshop on Machine Intelligence and Signal Processing held at the Indraprastha Institute of Information Technology. Traditionally, signal processing and machine learning were considered to be separate areas of research. However in recent times the two communities are getting closer. In a very abstract fashion, signal processing is the study of operator design. The contributions of signal processing had been to device operators for restoration, compression, etc. Applied Mathematicians were more interested in operator analysis. Nowadays signal processing research is gravitating towards operator learning – instead of designing operators based on heuristics (for example wavelets), the trend is to learn these operators (for example dictionary learning). And thus, the gap between signal processing and machine learning is fast converging. The 2014 Workshop on Machine Intel...
O momento pericial : Ethos pericial e disputa no campo previdenciário

OpenAIRE

Biscaia, Leonardo

2016-01-01

Orientador: Profª. Drª. Maria Tarcisa Silva Bega Tese (doutorado) - Universidade Federal do Paraná, Setor de Ciências Humanas, Programa de Pós-Graduação em Sociologia. Defesa: Curitiba, 09/05/2016 Inclui referências : f. 294-323 Resumo: A tese analisa o habitus da perícia médica previdenciária e a sua inserção no campo previdenciário, bem como as disputas que diferentes agentes coletivos mantêm com a perícia em torno de determinados capitais. Esses objetivos são perseguidos a partir ...

Prevalence of methylphenidate use by university students in Campos dos Goytacazes, RJ

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Fernanda Fraga Pessanha

2014-08-01

Full Text Available Methylphenidate is a central nervous system stimulant commonly prescribed for children with Attention Deficit Hyperactivity Disorder. The aim of this study was to identify the prevalence of methylphenidate users among college students, as well as the main reasons for it, ways of acquisition, and possible side effects. The study demonstrated a 60% prevalence of the use of methylphenidate by university students in Campos dos Goytacazes. We conclude that there is a high rate of use of methylphenidate among students in this city. The authors suggest an awareness campaign on the risks of inappropriate use of methylphenidate.
Campo de pesquisa em contabilidade: uma análise de redes sob a perspectiva institucional

Directory of Open Access Journals (Sweden)

Márcia Maria dos Santos Bortolocci Espejo

2009-08-01

Full Text Available Esta investigação teve por objetivo identificar, sob a perspectiva da teoria institucional,os autores e as instituições de destaque envolvidos no campo da pesquisa em Contabilidade no período entre 2004 e 2008. Realizou-se um estudo bibliométrico e sociométrico, de caráter descritivo, de 825 artigos oriundos de anais e periódicos. Para tanto, dividiram-se os artigos em três áreas temáticas - ensino e pesquisa; Contabilidade gerencial; e usuários externos - e se efetuou a apresentação das redes de cooperação, considerando as instituições como um todo e dividindo os autores em conformidade com as áreas temáticas. Posteriormente, procedeu-se à análise das áreas, das instituições e dos autores que mais apresentaram publicações na amostra. Como principais resultados, obteve-se que: a a área usuários externos apresenta maior número de publicações e a área ensino e pesquisa está em ascensão; b a USP se destaca como instituição com maior número de vínculos com autores da amostra e como ator central na rede de cooperação entre instituições; c a rede de cooperação, no tema ensino e pesquisa, apresenta-se mais fragmentada; e d as redes sobre os temas Contabilidade gerencial e, principalmente, usuários externos destacam-se por apresentarem grande número de interconexões entre grupos por meio de laços fracos. Conclui-se que o campo analisado é marcado pela existência de densas redes de cooperação entre autores e entre instituições nacionais, contudo baixas com instituições internacionais. Conclui-se, também, que as análises realizadas, empregando conceitos da teoria institucional, possibilitaram a identificação dos principais agentes envolvidos no campo de pesquisa contábil.
Learning Activity Packets for Milling Machines. Unit I--Introduction to Milling Machines.

Science.gov (United States)

Oklahoma State Board of Vocational and Technical Education, Stillwater. Curriculum and Instructional Materials Center.

This learning activity packet (LAP) outlines the study activities and performance tasks covered in a related curriculum guide on milling machines. The course of study in this LAP is intended to help students learn to identify parts and attachments of vertical and horizontal milling machines, identify work-holding devices, state safety rules, and…
RELACIÓN ENTRE DIFERENTES PRUEBAS DE CAMPO: FUERZA, POTENCIA Y VELOCIDAD

Directory of Open Access Journals (Sweden)

Jessenia Hernández Elizondo

2003-12-01

Full Text Available Esta investigación tuvo como propósito principal el encontrar por medio de pruebas en las variables de fuerza, potencia y velocidad, la relación matemática existente entre estos tres constructos. Participaron 56 sujetos varones con edades entre 18 y 25 años. Con el fin de responder al objetivo del estudio, se les aplicaron pruebas de campo de fuerza (1RM de sentadilla completa y repeticiones máximas al 80% 60% 40% y 20%, de velocidad (30 metros lanzados y 30 metros sin impulso, y de potencia (salto vertical con contra-movimiento SVCM, salto vertical sin impulso SVSI y salto vertical con caída SVCC, para correlacionar las diferentes pruebas entre sí. Los datos fueron analizados por medio de la correlación de Pearson (r, para correlacionar parejas de pruebas y correlación canónica (Rc para correlacionar grupos de variables. A partir de cada correlación se obtuvo la varianza explicada (r2 la cual indica el porcentaje de relación compartida en escala de 0-100 que existe entre las pruebas. Según los datos obtenidos, no existe relación significativa (2.1% entre las pruebas de salto-sentadilla, ni relación significativa (5.1% entre las pruebas de velocidad- sentadilla, mientras que la relación salto- velocidad (62%, fue estadísticamente significativa (p < 0.05. La implicación de estos resultados podrían respaldar la idea de que la relación teórica que existe entre estos constructos, no es completamente cierta cuando éstos son medidos por medio de pruebas de campo.
Human-machine interactions

Science.gov (United States)

Forsythe, J Chris [Sandia Park, NM; Xavier, Patrick G [Albuquerque, NM; Abbott, Robert G [Albuquerque, NM; Brannon, Nathan G [Albuquerque, NM; Bernard, Michael L [Tijeras, NM; Speed, Ann E [Albuquerque, NM

2009-04-28

Digital technology utilizing a cognitive model based on human naturalistic decision-making processes, including pattern recognition and episodic memory, can reduce the dependency of human-machine interactions on the abilities of a human user and can enable a machine to more closely emulate human-like responses. Such a cognitive model can enable digital technology to use cognitive capacities fundamental to human-like communication and cooperation to interact with humans.
LAS PRÁCTICAS DE CAMPO COMO ESTRATEGIA DIDÁCTICA PARA LA ENSEÑANZA DE LA BIOLOGÍA EN LA UNIVERSIDAD PEDAGÓGICA NACIONAL.

Directory of Open Access Journals (Sweden)

Karen Liliana Castro Mosquera

2014-12-01

Así mismo invita al lector a realizar una reflexión y posicionamiento crítico sobre las Prácticas de Campo y su respectiva importancia, no desde lecturas presupuestales para su realización, sino desde las implicaciones formativas en el hacer de trabajos prácticos relacionados con la Enseñanza de la Biología en la Universidad Pedagógica Nacional; siendo esta una estrategia didáctica que aporta para la construcción de identidad profesional en los estudiantes en formación; convirtiéndose la Práctica de Campo en la razón principal y el espacio académico para reafirmar la caracterización de lo vivo objeto de estudio de la Biología, especificándose múltiples formas de poner en práctica y de forma permanente las Prácticas de Campo como estrategia educativa con el objeto de lograr un excelente conocimiento de los conceptos Biológicos y Científicos
Electrical Discharge Machining (EDM: A Review

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Asfana Banu

2016-09-01

Full Text Available Electro discharge machining (EDM process is a non-conventional and non-contact machining operation which is used in industry for high precision products. EDM is known for machining hard and brittle conductivematerials since it can melt any electrically conductive material regardless of its hardness. The workpiece machined by EDM depends on thermal conductivity, electrical resistivity, and melting points of the materials. The tool and the workpiece are adequately both immersed in a dielectric medium, such as, kerosene, deionised water or any other suitable fluid. This paper is reviewed comprehensively on types of EDM operation. A brief discussion is also done on the machining responses and mathematical modelling.
Characterization of Magnetic Field Immersed Photomultipliers from Double Chooz Experiment. Design and Construction of their Magnetic Shields; Caracterizacion de los fotomultiplicadores del experimento Double Chooz bajo campo magnetico y diseno y construccion de sus blindajes magneticos

Energy Technology Data Exchange (ETDEWEB)

Valdivia Valero, F J

2007-12-28

Flavour oscillations of neutrinos are a quantum-mechanical effect widely demonstrated. It is explained through interferences of their mass eigenstates, therefore, belonging to the physical area beyond the Standard Model. This work deals with the CIEMAT collaboration in the neutrino experiment Double Chooz. Such an experiment aims to measure the mixture angle {theta}{sub 1}3, one of the PMNS leptonic mixture matrix, with a un reached-before sensibility by decrease of systematic errors. For this, two identical scintillator detectors, equipped with PMT's, will be sited at different distances from two reactors located in the nuclear power plant CHOOZ B (France). The electronic neutrino flux from these reactors will be compared, explaining its deficit by flavour oscillations of these particles. The identity of both detectors will be diminished by the magnetic field effects on the PMT's response. Therefore, this study serves as for quantifying such an effects as for fitting the magnetic shields design that minimize them. Shielding measurements and final design of magnetic shields as much as the effect these ones cause in the PMT's response immersed in a monitored magnetic field are presented. (Author) 85 refs.
Characterization of Magnetic Field Immersed Photomultipliers from Double Chooz Experiment. Design and Construction of their Magnetic Shields; Caracterizacion de los fotomultiplicadores del experimento Double Chooz bajo campo magnetico y diseno y construccion de sus blindajes magneticos

Energy Technology Data Exchange (ETDEWEB)

Valdivia Valero, F. J.

2007-12-28

Flavour oscillations of neutrinos are a quantum-mechanical effect widely demonstrated. It is explained through interferences of their mass eigenstates, therefore, belonging to the physical area beyond the Standard Model. This work deals with the CIEMAT collaboration in the neutrino experiment Double Chooz. Such an experiment aims to measure the mixture angle {theta}{sub 1}3, one of the PMNS leptonic mixture matrix, with a un reached-before sensibility by decrease of systematic errors. For this, two identical scintillator detectors, equipped with PMT's, will be sited at different distances from two reactors located in the nuclear power plant CHOOZ B (France). The electronic neutrino flux from these reactors will be compared, explaining its deficit by flavour oscillations of these particles. The identity of both detectors will be diminished by the magnetic field effects on the PMT's response. Therefore, this study serves as for quantifying such an effects as for fitting the magnetic shields design that minimize them. Shielding measurements and final design of magnetic shields as much as the effect these ones cause in the PMT's response immersed in a monitored magnetic field are presented. (Author) 85 refs.
Human-machine interface upgrade

International Nuclear Information System (INIS)

Kropik, M.; Matejka, K.; Sklenka, L.; Chab, V.

2002-01-01

The article describes a new human-machine interface that was installed at the VR-1 training reactor. The human-machine interface upgrade was completed in the summer 2001. The interface was designed with respect to functional, ergonomic and aesthetic requirements. The interface is based on a personal computer equipped with two displays. One display enables alphanumeric communication between the reactor operator and the nuclear reactor I and C. The second display is a graphical one. It presents the status of the reactor, principal parameters (as power, period), control rods positions, course of the reactor power. Furthermore, it is possible to set parameters, to show the active core configuration, to perform reactivity calculations, etc. The software for the new human-machine interface was produced with the InTouch developing tool of the Wonder-Ware Company. It is possible to switch the language of the interface between Czech and English because of many foreign students and visitors to the reactor. Microcomputer based communication units with proper software were developed to connect the new human-machine interface with the present reactor I and C. The new human-machine interface at the VR-1 training reactor improves the comfort and safety of the reactor utilisation, facilitates experiments and training, and provides better support for foreign visitors. (orig.)
Game-powered machine learning.

Science.gov (United States)

Barrington, Luke; Turnbull, Douglas; Lanckriet, Gert

2012-04-24

Searching for relevant content in a massive amount of multimedia information is facilitated by accurately annotating each image, video, or song with a large number of relevant semantic keywords, or tags. We introduce game-powered machine learning, an integrated approach to annotating multimedia content that combines the effectiveness of human computation, through online games, with the scalability of machine learning. We investigate this framework for labeling music. First, a socially-oriented music annotation game called Herd It collects reliable music annotations based on the "wisdom of the crowds." Second, these annotated examples are used to train a supervised machine learning system. Third, the machine learning system actively directs the annotation games to collect new data that will most benefit future model iterations. Once trained, the system can automatically annotate a corpus of music much larger than what could be labeled using human computation alone. Automatically annotated songs can be retrieved based on their semantic relevance to text-based queries (e.g., "funky jazz with saxophone," "spooky electronica," etc.). Based on the results presented in this paper, we find that actively coupling annotation games with machine learning provides a reliable and scalable approach to making searchable massive amounts of multimedia data.
X-ray evaluation of residual stress distributions within surface machined layer generated by surface machining and sequential welding

International Nuclear Information System (INIS)

Taniguchi, Yuu; Okano, Shigetaka; Mochizuki, Masahito

2017-01-01

The excessive tensile residual stress generated by welding after surface machining may be an important factor to cause stress corrosion cracking (SCC) in nuclear power plants. Therefore we need to understand and control the residual stress distribution appropriately. In this study, residual stress distributions within surface machined layer generated by surface machining and sequential welding were evaluated by X-ray diffraction method. Depth directional distributions were also investigated by electrolytic polishing. In addition, to consider the effect of work hardened layer on the residual stress distributions, we also measured full width at half maximum (FWHM) obtained from X-ray diffraction. Testing material was a low-carbon austenitic stainless steel type SUS316L. Test specimens were prepared by surface machining with different cutting conditions. Then, bead-on-plate welding under the same welding condition was carried out on the test specimens with different surface machined layer. As a result, the tensile residual stress generated by surface machining increased with increasing cutting speed and showed nearly uniform distributions on the surface. Furthermore, the tensile residual stress drastically decreased with increasing measurement depth within surface machined layer. Then, the residual stress approached 0 MPa after the compressive value showed. FWHM also decreased drastically with increasing measurement depth and almost constant value from a certain depth, which was almost equal regardless of the machining condition, within surface machined layer in all specimens. After welding, the transverse distribution of the longitudinal residual stress varied in the area apart from the weld center according to machining conditions and had a maximum value in heat affected zone. The magnitude of the maximum residual stress was almost equal regardless of the machining condition and decreased with increasing measurement depth within surface machined layer. Finally, the
Electromechanical model of machine for vibroabrasive treatment of machine parts

OpenAIRE

Gorbatiyk, Ruslan; Palamarchuk, Igor; Chubyk, Roman

2015-01-01

A lot of operations on trimming clean and finishing – stripping up treatment, first of all, removing of burrs, rounding and processing of borders, until recently time was carried out by hand, and hardly exposed to automation and became a serious obstacle in subsequent growth of the labor productivity. Machines with free kinematics connection between a tool and the treating parts is provided by the printing-down of all of the surface of the machine parts, that allows us to effectively treat bo...
Experimental Investigation – Magnetic Assisted Electro Discharge Machining

Science.gov (United States)

Kesava Reddy, Chirra; Manzoor Hussain, M.; Satyanarayana, S.; Krishna, M. V. S. Murali

2018-04-01

Emerging technology needs advanced machined parts with high strength and temperature resistance, high fatigue life at low production cost with good surface quality to fit into various industrial applications. Electro discharge machine is one of the extensively used machines to manufacture advanced machined parts which cannot be machined by other traditional machine with high precision and accuracy. Machining of DIN 17350-1.2080 (High Carbon High Chromium steel), using electro discharge machining has been discussed in this paper. In the present investigation an effort is made to use permanent magnet at various positions near the spark zone to improve surface quality of the machined surface. Taguchi methodology is used to obtain optimal choice for each machining parameter such as peak current, pulse duration, gap voltage and Servo reference voltage etc. Process parameters have significant influence on machining characteristics and surface finish. Improvement in surface finish is observed when process parameters are set at optimum condition under the influence of magnetic field at various positions.
Machine safety: proper safeguarding techniques.

Science.gov (United States)

Martin, K J

1992-06-01

1. OSHA mandates certain safeguarding of machinery to prevent accidents and protect machine operators. OSHA specifies moving parts that must be guarded and sets criteria for the guards. 2. A 1989 OSHA standard for lockout/tagout requires locking the energy source during maintenance, periodically inspecting for power transmission, and training maintenance workers. 3. In an amputation emergency, first aid for cardiopulmonary resuscitation, shock, and bleeding are the first considerations. The amputated part should be wrapped in moist gauze, placed in a sealed plastic bag, and placed in a container of 50% water and 50% ice for transport. 4. The role of the occupational health nurse in machine safety is to conduct worksite analyses to identify proper safeguarding and to communicate deficiencies to appropriate personnel; to train workers in safe work practices and observe compliance in the use of machine guards; to provide care to workers injured by machines; and to reinforce safe work practices among machine operators.
The deleuzian abstract machines

DEFF Research Database (Denmark)

Werner Petersen, Erik

2005-01-01

To most people the concept of abstract machines is connected to the name of Alan Turing and the development of the modern computer. The Turing machine is universal, axiomatic and symbolic (E.g. operating on symbols). Inspired by Foucault, Deleuze and Guattari extended the concept of abstract...
Frente de pesquisa de títulos de livros: um estudo aplicado no campo da Educação Indígena

Directory of Open Access Journals (Sweden)

Alexandre Masson Maroldi

2017-12-01

Full Text Available Derek de Solla Price pode ser considerado um dos mais importantes pesquisadores dos estudos métricos. Entre suas inúmeras contribuições ao campo da cientometria, destaca-se o conceito de frente de pesquisa que é composto pelo conjunto de autores mais citados em um determinado campo do conhecimento. O objetivo desse trabalho é, a partir da ideia original de Price, identificar a frente de pesquisa de títulos de livros e de autores citados em teses e dissertações defendidos entre 2001 e 2016 no campo de pesquisa da Educação Indígena. Os resultados apontaram que o livro de Clifford Geertz, A interpretação das culturas é o título mais citado, enquanto que o autor Paulo Freire lidera a frente de pesquisa da literatura citada. Esses resultados dessas duas frentes de pesquisa demonstram que ambos os cálculos são complementares e permitem compreender melhor a configuração da literatura científica que embasa as pesquisas no subcampo da educação indígena.
Man-machine interactions 3

CERN Document Server

Czachórski, Tadeusz; Kozielski, Stanisław

2014-01-01

Man-Machine Interaction is an interdisciplinary field of research that covers many aspects of science focused on a human and machine in conjunction. Basic goal of the study is to improve and invent new ways of communication between users and computers, and many different subjects are involved to reach the long-term research objective of an intuitive, natural and multimodal way of interaction with machines. The rapid evolution of the methods by which humans interact with computers is observed nowadays and new approaches allow using computing technologies to support people on the daily basis, making computers more usable and receptive to the user's needs. This monograph is the third edition in the series and presents important ideas, current trends and innovations in the man-machine interactions area. The aim of this book is to introduce not only hardware and software interfacing concepts, but also to give insights into the related theoretical background. Reader is provided with a compilation of high...
Hydraulic Power Plant Machine Dynamic Diagnosis

Directory of Open Access Journals (Sweden)

Hans Günther Poll

2006-01-01

Full Text Available A method how to perform an entire structural and hydraulic diagnosis of prototype Francis power machines is presented and discussed in this report. Machine diagnosis of Francis units consists on a proper evaluation of acquired mechanical, thermal and hydraulic data obtained in different operating conditions of several rotary and non rotary machine components. Many different physical quantities of a Francis machine such as pressure, strains, vibration related data, water flow, air flow, position of regulating devices and displacements are measured in a synchronized way so that a relation of cause an effect can be developed for each operating condition and help one to understand all phenomena that are involved with such kind of machine. This amount of data needs to be adequately post processed in order to allow correct interpretation of the machine dynamics and finally these data must be compared with the expected calculated data not only to fine tuning the calculation methods but also to accomplish fully understanding of the influence of the water passages on such machines. The way how the power plant owner has to operate its Francis machines, many times also determined by a central dispatcher, has a high influence on the fatigue life time of the machine components. The diagnostic method presented in this report helps one to understand the importance of adequate operation to allow a low maintenance cost for the entire power plant. The method how to acquire these quantities is discussed in details together with the importance of correct sensor balancing, calibration and adequate correlation with the physical quantities. Typical results of the dynamic machine behavior, with adequate interpretation, obtained in recent measurement campaigns of some important hydraulic turbines were presented. The paper highlights the investigation focus of the hydraulic machine behavior and how to tailor the measurement strategy to accomplish all goals. Finally some
Towards Massive Machine Type Cellular Communications

OpenAIRE

Dawy, Zaher; Saad, Walid; Ghosh, Arunabha; Andrews, Jeffrey G.; Yaacoub, Elias

2015-01-01

Cellular networks have been engineered and optimized to carrying ever-increasing amounts of mobile data, but over the last few years, a new class of applications based on machine-centric communications has begun to emerge. Automated devices such as sensors, tracking devices, and meters - often referred to as machine-to-machine (M2M) or machine-type communications (MTC) - introduce an attractive revenue stream for mobile network operators, if a massive number of them can be efficiently support...

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