1,721,197 research outputs found
Advanced control systems for MEMS capacitive sensing accelerometers
No full textThis paper presents the use of a multi stage noise shaping (MASH) architecture to enhance the performance of closed loop capacitive inertial sensors which employ sigma-delta modulation as their method of force balancing. By means of simulation it has been shown that the performance of the accelerometer can be improved by as much as 20dB. The approach has been applied to a lateral bulk mocromachined accelerometer and results show a significant noise reduction in the baseband of the system, resulting in an improvement in the overall performance of the sensor
Stepwise-graded LDPE/aluminum composites: RSM-based optimization for enhanced strength and EMI shielding
Get PDFAmong the most salient features of composite materials are lightness, adjustability, and operational manufacturability. In telecommunication structures, it is imperative that the material meet mechanical strength and electromagnetic properties in tandem. Electromagnetic shielding must be considered in telecommunication boxes, in conjunction with structural strength. This article discusses the manufacture and experimental test of polymer multilayers stepwise graded from low-density polyethylene polymer with different percentages of aluminum powder and arrangement. The injection method was employed to manufacture the stepwise graded layers, and the Response surface methodology method was utilized to optimize the powder percentages, arrangements, and identify the optimal percentage for the functional structure layers. A comprehensive review and analysis of the results were conducted to enhance shielding in the frequency range of 1-8 GHz and attain maximum tensile strength. The outcomes demonstrate that the optimal structure attains a tensile strength equivalent to 8.64 MPa, according to the ASTM D 638 standard, and a shielding of-14 dB, in standard waveguide device. The manufacturing process was duly considered, and the obtained results render this structure suitable for utilization in telecommunication applications
Analysis of parasite effects in the performance of closed loop micromachined inertial sensors with higher order SD-Modulators
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“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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