1,721,107 research outputs found
Design aspects and early experiments of a Vanadium Redox Flow Battery cell test facility: measurements and methods for scaling up
No full textRedox Flow Batteries (RFBs) development and future success depend on the research on new active materials, namely electrolytic solutions, membranes and electrodes, typically conduced on small single-cell device [1]. However, also the technological development plays a fundamental role in view of the successful design of large RFB systems [2]. This work presents the design, construction and early operation of a single-cell medium-size (5 cm x 8 cm) Vanadium Redox Flow Battery (VRFB) cell test facility, dubbed VRFB-CTF Fig. 1a) suitable to test materials and geometries in easly controllable and adjustable conditions. VRFB-CTF is also capable of testing small VRFB stacks. The test bench has been designed and built to accurately measure the main thermal, hydraulic, electric, and energetic quantites affecting the performance of VRFBs [3]. By extrapolating such measurements, the performance of large-scale RFB stacks can be estimated by means of analytical formulations built on similitude concepts. VRFB-CTF layout has been conceived for high accessibility with the pump for circulating the solutions located apart. The hydraulic circuits are equipped with valves for fast maintenance operation and the reservoirs are hermetically sealed with their residual volumes filled with inert gas to prevent vanadium species contamination from atmospheric oxygen. The plant is fully instrumented with electrical, thermal and fluid-dynamic probes. Charge and discharge power control is provided by a Power Conditioning System (PCS) that can be controlled both locally and remotely by a Flow Battery Management System (FBMS). The latter has been designed and built around a desktop computer with a compact data acquisition interface in LabVIEW enviroment that allows fully customizable high-level SCADA-like (Supervisory Control And Data Acquisition) data management and experiment control (Fig. 1b). Instrumentation includes a multichannel electrochemical impedance spectroscopy (EIS) analyzer. Measurents provided by VRFB-CTF have already been used to address criteria and metrics for the design of industrial-scale RFBs [4]
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Compositional analysis of ultrathin silicon oxynitride gate dielectrics by quantitative electron energy loss spectroscopy
No full text
Multi-Scale Environment For Simulation And Materials Characterization In Stress Management For 3D IC TSV-Based Technologies—Effect Of Stress On The Device Characteristics
No full textMulti-scale simulation flow and multi-scale materials characterization for stress management in 3D through-silicon-via integration technologies – Effect of stress on 3D IC interconnect reliability
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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