Direito de Resposta / Lourival de Jesus Serejo Sousa. --

Inclui bibliografia.

Ainda sobre o efeito vinculante / Ellen Gracie Northfleet. --

Efeito Vinculante. Síntese Trabalhista, v. 7 n. 84 p. 128-129 jun. 1996.

Highly Conductive Carbon Fiber Reinforced Concrete for Icing Prevention and Curing

This paper aims to study the feasibility of highly conductive carbon fiber reinforced concrete (CFRC) as a self-heating material for ice formation prevention and curing in pavements. Tests were carried out in lab ambient conditions at different fixed voltages and then introduced in a freezer at −15 °C. The specimens inside the freezer were exposed to different fixed voltages when reaching +5 °C for prevention of icing and when reaching the temperature inside the freezer, i.e., −15 °C, for curing of icing. Results show that this concrete could act as a heating element in pavements with risk of ice formation, consuming a reasonable amount of energy for both anti-icing (prevention) and deicing (curing), which could turn into an environmentally friendly and cost-effective deicing method.

Blazed Gratings Recorded in Absorbent Photopolymers

Phase diffractive optical elements, which have many interesting applications, are usually fabricated using a photoresist. In this paper, they were made using a hybrid optic-digital system and a photopolymer as recording medium. We analyzed the characteristics of the input and recording light and then simulated the generation of blazed gratings with different spatial periods in different types of photopolymers using a diffusion model. Finally, we analyzed the output and diffraction efficiencies of the 0 and 1st order so as to compare the simulated values with those measured experimentally. We evaluated the effects of index matching in a standard PVA/AA photopolymer, and in a variation of Biophotopol, a more biocompatible photopolymer. Diffraction efficiencies near 70%, for a wavelength of 633 nm, were achieved for periods longer than 300 µm in this kind of materials.

Smart Monitoring Embedded Service for Energy-Efficient and Sustainable Management in Data Centers

Information technologies (IT) currently represent 2% of CO2 emissions. In recent years, a wide variety of IT solutions have been proposed, focused on increasing the energy efficiency of network data centers. Monitoring is one of the fundamental pillars of these systems, providing the information necessary for adequate decision making. However, today’s monitoring systems (MSs) are partial, specific and highly coupled solutions. This study proposes a model for monitoring data centers that serves as a basis for energy saving systems, offered as a value-added service embedded in a device with low cost and power consumption. The proposal is general in nature, comprehensive, scalable and focused on heterogeneous environments, and it allows quick adaptation to the needs of changing and dynamic environments. Further, a prototype of the system has been implemented in several devices, which has allowed validation of the proposal in addition to identification of the minimum hardware profile required to support the model.

Los debates en torno al ferrocarril en España anteriores a la creación de RENFE: el camino hacia el monopolio de Estado

Desde su nacimiento hasta la caída de la dictadura de Primo de Rivera, el ferrocarril se perfiló como una industria doblemente creadora de riqueza, estimulando por un lado la ya existente e impulsando el desarrollo económico por otro. Ante sus peculiaridades técnicas, económicas y de mercado, los distintos gobiernos adoptaron soluciones intervencionistas de mayor o menor grado. Simultáneamente, en su primer desarrollo, se produjo el abandono del paradigma clásico basado en la libre competencia, lo que derivó en la conversión del ferrocarril en foco de la retórica anti-competencia y de la práctica intervencionista. En este trabajo realizamos un seguimiento del nacimiento y desarrollo del ferrocarril, centrado exclusivamente en la evolución político-económica del sector dentro de la propia evolución histórica, paralela a la vía nacionalista del capitalismo español, y en la descriptiva teórica y práctica del desarrollo del intervencionismo y las restricciones al libre mercado.

Observações sobre biologia de Spaethiella tristis (Boh.) (Coleoptera: Chrysomelidae) e danos causados ao dendezeiro.

O ciclo de vida de Spaethiella tristis (Boh.), um besouro que se alimenta de folhas de dende (Elaeis guineensis Jacq.), é de mais ou menos 56 dias, sob condicoes de laboratorio. Seus inimigos naturais, coletados de um plantio de dende na Estacao Experimental do Rio Urubu/CPAA, foram: Paecilomyces farinosus (Samson & Evans) e Metarhizium sp. parasitando larvas e adultos, respectivamente, e uma especie nao identificada de Chalcididae (Hymenoptera), parasitando larvas. O dano da folha causado por S. tristis é agravado pela infeccao do fungo Pestalotiopsis guepini (Desm.) Steyaert, que se instala nos ferimentos feitos pelo inseto.