The elements : a visual exploration of every known atom in the universe.

Las imágenes de esta publicación constituyen la representación visual más completa de cada átomo del universo. Organizada por orden de aparición en la tabla periódica, de cada elemento de los ciento dieciocho que la componen se facilitan datos, cifras, propiedades incluyendo el peso atómico, densidad, punto de ebullición y de fusión, valencia, electronegatividad, y el año y lugar en que se descubrió. Fotografías adicionales muestran cada elemento en formas ligeramente alteradas y sus aplicaciones.

Desarrollo económico y educación.

Artículo de divulgación de las investigaciones del profesor norteamericano Theodore W. Schultz sobre coste y rendimiento de la enseñanza en Estados Unidos en el período 1900-1957.

Relação entre personalidade, vulnerabilidade ao stress e burnout nos elementos da polícia de segurança pública

Os polícias são profissionais expostos a diversos fatores de stress, podendo este ser percecionado de diferentes formas consoante a personalidade de cada pessoa. Tentámos conhecer a vulnerabilidade ao stress e a relação com a personalidade em elementos da Polícia de Segurança Pública, verificando também se o stress e as perturbações da personalidade estão correlacionados. A amostra utilizada neste estudo foi constituída por 119 indivíduos adultos, 13 do sexo feminino com uma média de idades de 26 anos (DP=1.53) e 106 do sexo masculino com uma média de idades de 25.31 anos (DP=2.14). Como medidas foram utilizadas, para as Perturbações da Personalidade, o Inventário Clínico Multiaxial de Millon - MCMI (Millon, 1969), para a vulnerabilidade ao stress, o 23 Q.V.S (Vaz Serra, 2000) e para a Síndrome de Burnout (exaustão, cinismo e eficácia profissional) o M.B.I-G.S. (Scaufeli; Leiter; Maslach; Jackson, 1996 ; Nunes, 2003). Os resultados confirmam as relações esperadas, designadamente entre o narcisimo e a exaustão emocional e entre o perfecionismo e o burnout. Os resultados são discutidos de acordo com a literatura.

El mito Roosevelt para América Latina (1901-1909)

La figura de Theodore Roosevelt, presidente de los Estados Unidos de 1901 a 1909, ha sido alimentada negativamente sin comprender que su política exterior respondió a las necesidades de la nación estadounidense en pleno proceso de expansión imperialista. Este personaje se ha convertido en un mito histórico no sólo por haber definido el papel de Estados Unidos en el mundo a partir del interés nacional sino, también, por su política intervensionista en América Latina. El análisis histórico en la larga duración permite el estudio de aspectos ideológicos, culturales y su vinculación con la política exterior. Nuestro personaje, y el establishment del que era parte, vivió una época marcada por la expansión económica, un darwinismo social tergiversado, el racialismo, un sentido de destino manifiesto y la misión civilizadora. Este trabajo intenta establecer esa diferenciación que tuvo Theodore Roosevelt entre Centroamérica y América del Sur para la aplicación de su política exterior, que no puede ser llamada «política del gran garrote», pues se caería en la generalización, sino más bien diplomacia del control y de la fuerza. El análisis del discurso de este personaje evidencia cómo él percibió unas zonas al sur de Estados Unidos, como «civilizadas», en contraposición a aquellas que consideraba «bárbaras», en Centroamérica.

A Field Evaluation of the Time-of-Detection Method to Estimate Population Size and Density for Aural Avian Point Counts

The time-of-detection method for aural avian point counts is a new method of estimating abundance, allowing for uncertain probability of detection. The method has been specifically designed to allow for variation in singing rates of birds. It involves dividing the time interval of the point count into several subintervals and recording the detection history of the subintervals when each bird sings. The method can be viewed as generating data equivalent to closed capture–recapture information. The method is different from the distance and multiple-observer methods in that it is not required that all the birds sing during the point count. As this method is new and there is some concern as to how well individual birds can be followed, we carried out a field test of the method using simulated known populations of singing birds, using a laptop computer to send signals to audio stations distributed around a point. The system mimics actual aural avian point counts, but also allows us to know the size and spatial distribution of the populations we are sampling. Fifty 8-min point counts (broken into four 2-min intervals) using eight species of birds were simulated. Singing rate of an individual bird of a species was simulated following a Markovian process (singing bouts followed by periods of silence), which we felt was more realistic than a truly random process. The main emphasis of our paper is to compare results from species singing at (high and low) homogenous rates per interval with those singing at (high and low) heterogeneous rates. Population size was estimated accurately for the species simulated, with a high homogeneous probability of singing. Populations of simulated species with lower but homogeneous singing probabilities were somewhat underestimated. Populations of species simulated with heterogeneous singing probabilities were substantially underestimated. Underestimation was caused by both the very low detection probabilities of all distant individuals and by individuals with low singing rates also having very low detection probabilities.

California's Endangered Belding’s Savannah Sparrow (Passerculus sandwichensis beldingi): Tolerance of Pedestrian Disturbance

Salt marshes constitute habitat islands for many endemic animal species, particularly along the California coast, where urban sprawl has fragmented this habitat. Recreational activities in salt marshes have increased recently, posing an interesting problem: how do endemic species lacking alternative habitat modify their tolerance to humans? We assessed seasonal and site variations in three tolerance parameters (distances at which animals became alert, fled, and moved after fleeing) of California's endangered Belding’s Savannah Sparrow ((Passerculus sandwichensis beldingi). We approached individuals on trails in three salt marshes with different levels of vehicle and pedestrian traffic. Belding’s Savannah Sparrows became aware and fled at shorter distances in the salt marsh coincident with greater levels of recreational activity as a result of habituation or visual obstruction effects. Seasonal effects in tolerance varied between sites. Alert and flight initiation distances were higher in the pre-nesting than in the non-breeding season in the site with the highest levels of recreational use likely due to greater exposure of breeding individuals; however, the opposite seasonal trend was found in each of the two sites with relatively lower human use, probably because individuals were less spatially attached in the non-breeding season when they foraged in aggregations. Distance fled was greater in the non-breeding than in the breeding season. Our findings call for dynamic management of recreational activities in different salt marshes depending on the degree of exposure to humans and seasonal variations in tolerance. We recommend a minimum approaching distance of 63 m and buffer areas of 1.3 ha around Belding's Savannah Sparrows.

Determiner spreading as DP-predication

Determiner Spreading (DS) occurs in adjectivally modified nominal phrases comprising more than one definite article, a phenomenon that has received considerable attention and has been extensively described in Greek. This paper discusses the syntactic properties of DS in detail and argues that DS structures are both arguments and predication configurations involving two DPs. This account successfully captures the word-order facts and the distinctive interpretation of DS, while also laying the groundwork towards unifying it with other structures linking two DPs in a predicative relation.