20 recomanacions per redactar bé : guia breu per redactar continguts acadèmics d'acord amb els estàndards de qualitat universitària

Aquest document pretén ser una guia breu i senzilla amb indicacions clares que us ajudin a aconseguir que la qualitat final dels textos que redacteu sigui millor. La guia, elaborada conjuntament pels serveis lingüístics de diverses universitats, s'ha redactat a partir dels errors detectats en les pàgines web que la Generalitat ha avaluat el 2010

A CMOS-MEMS RF-tunable bandpass filter based on two high-Q 22-MHz polysilicon clamped-clamped beam resonators

This letter presents the design, fabrication, and demonstration of a CMOS-MEMS filter based on two high-Q submicrometer-scale clamped-clamped beam resonators with resonance frequency around 22 MHz. The MEMS resonators are fabricated with a 0.35-μm CMOS process and monolithically integrated with an on-chip differential amplifier. The CMOS-MEMS resonator shows high-quality factors of 227 in air conditions and 4400 in a vacuum for a bias voltage of 5 V. In air conditions, the CMOS-MEMS parallel filter presents a programmable bandwidth from 100 to 200 kHz with a < 1-dB ripple. In a vacuum, the filter presents a stop-band attenuation of 37 dB and a shape factor as low as 2.5 for a CMOS-compatible bias voltage of 5 V, demonstrating competitive performance compared with the state of the art of not fully integrated MEMS filters. © 2009 IEEE.Peer reviewe

Harvester-on-chip: Design of a proof of concept prototype

The main features of a novel concept in integrated MEMS-CMOS energy scavenging systems are presented. In this new concept, named harvester-on-chip (HoC), a chip only dedicated to scavenging functions, which co-integrate the MEMS electrostatic energy micro-converter along with the CMOS power conditioning circuitry, is defined. The use of the whole chip mass as inertial mass and the possibility to integrate an array of electrostatic harvesting transducers in the full chip surface are analyzed as main advantages of the new scavenger idea. The design and fabrication results of a proof of concept system integrated in a commercial CMOS technology are reported. © 2009 Elsevier B.V. All rights reserved.Peer reviewe

Third-mode 48 MHz free-free beam resonator used as a RF balun

In this paper, we present a new functional MEMS device monolithically integrated in a CMOS technology which is capable to mechanically perform the function of a balun, i.e. convert electrical signals that are unbalanced (single ended) to balanced ones. The RF-MEMS device consists on a 3rd order lateral mode free-free beam with a 48 MHz resonance frequency. The resonator is electrically actuated and capacitively detected allowing a fully integrated system. Two electrode configurations allow the signal phase shift between the two outputs of the RF-CMOS-MEMS device. © 2009 Elsevier B.V. All rights reserved.Peer reviewe

20 recomanacions per redactar bé : guia breu per redactar continguts acadèmics d'acord amb els estàndards de qualitat universitària

Aquest document pretén ser una guia breu i senzilla amb indicacions clares que us ajudin a aconseguir que la qualitat final dels textos que redacteu sigui millor. La guia, elaborada conjuntament pels serveis lingüístics de diverses universitats, s'ha redactat a partir dels errors detectats en les pàgines web que la Generalitat ha avaluat el 2010

Zero-level packaging of MEMS in standard CMOS technology

A novel technique for global packaging of MEMS devices using standard CMOS technology is presented. A MEMS polysilicon resonator is fabricated and on-chip packaged using two metal layers already available from the CMOS technology. A simple buffered HF wet etching process is performed in house to release the MEMS resonator while metal deposition is used to vacuum seal the zero-level package. Both post-processing steps are carried out on CMOS chips. The design of the metal layers is carefully done in order to avoid the degradation of the MEMS. The electrical frequency response of the resonator is used for testing the performance of the final package. Electrical measurements and physical characterization demonstrate proper performance of the MEMS resonator and package. © 2010 IOP Publishing Ltd.Peer reviewe

Integration of RF-MEMS resonators on submicrometric commercial CMOS technologies

Integration of electrostatically driven and capacitively transduced MEMS resonators in commercial CMOS technologies is discussed. A figure of merit to study the performance of different structural layers and different technologies is defined. High frequency (HF) and very high frequency (VHF) resonance MEMS metal resonators are fabricated on a deep submicron 0.18 νm commercial CMOS technology and are characterized using electrical tests without amplification, demonstrating the applicability of the MEMS fabrication process for future technologies. Moreover, the fabricated devices show comparable performance in terms of Q × fres with previously presented MEMS resonators, whereas the small gap allows obtaining a low motional resistance with a single resonator approach. © 2009 IOP Publishing Ltd.Peer reviewe

Effects of urban living environments on mental health in adults

Urban-living individuals are exposed to many environmental factors that may combine and interact to influence mental health. While individual factors of an urban environment have been investigated in isolation, no attempt has been made to model how complex, real-life exposure to living in the city relates to brain and mental health, and how this is moderated by genetic factors. Using the data of 156,075 participants from the UK Biobank, we carried out sparse canonical correlation analyses to investigate the relationships between urban environments and psychiatric symptoms. We found an environmental profile of social deprivation, air pollution, street network and urban land-use density that was positively correlated with an affective symptom group (r = 0.22, Pperm < 0.001), mediated by brain volume differences consistent with reward processing, and moderated by genes enriched for stress response, including CRHR1, explaining 2.01% of the variance in brain volume differences. Protective factors such as greenness and generous destination accessibility were negatively correlated with an anxiety symptom group (r = 0.10, Pperm < 0.001), mediated by brain regions necessary for emotion regulation and moderated by EXD3, explaining 1.65% of the variance. The third urban environmental profile was correlated with an emotional instability symptom group (r = 0.03, Pperm < 0.001). Our findings suggest that different environmental profiles of urban living may influence specific psychiatric symptom groups through distinct neurobiological pathways