“Consumption groups” (or “consumption cooperatives”) is one of the types of short circuits of foo... more “Consumption groups” (or “consumption cooperatives”) is one of the types of short circuits of food consumption. They are organized to create an alternative to the dominant model, the agro-food big chain. Breaking the barriers between consumers and producers, this model of organization strengthens the possibility of stimulating social and economic local development. In this article, we show how consumption groups take advantage of the traditional cooperative movement rooted in the XIXth century, and Information and Communication Technologies (ICT) in the context of Barcelona. We analyse how the Social and Solidary Economy (SSE) measurement indicators are achieved by agro-food consumption groups, the nature of the networks made up by consumers and producers and the relevance of ICTs to maintain the business activity. Using geolocalized data and social network analysis we highlight the significance of local economical connections among the actors involved. Even though consumption groups stimulate local business and correlate with SSE indicators, they are not represented in the design of public policies. This article wants to draw a different point of view in the promotion of alternative food futures as emerging social and economic actors, and the public policies to promote them.
We can distinguish two different approaches to agro-food consumption. The main model follows the ... more We can distinguish two different approaches to agro-food consumption. The main model follows the value chain nutrition rules and it is focused on establishing the quality and product pricestability. At the same time, strengthening the short circuits of commercialization is significant, as an alternative to the main model. These initiatives, which have different working matters, promote the roll to involve consumers in the consequences of their consumption habits. In addition, these types of consumers value direct connection between producers and local stakeholders. In the context of Network Society, ICT adoptions offer a tool to organize these short circuits of commercialization business. This article studies the case of the municipality of Sant Cugat del Vallès, located close to Barcelona metropolitan area and where we can recognise much of the short circuit of commercialization patterns. On the one hand, we are evaluating if the proliferation of these initiatives into the proximit...
Abstract—A systematic method to improve the quality () factor of RF integrated inductors is prese... more Abstract—A systematic method to improve the quality () factor of RF integrated inductors is presented in this paper. The proposed method is based on the layout optimization to minimize the series resistance of the inductor coil, taking into account both ohmic losses, due to conduction currents, and magnetically induced losses, due to Eddy currents. The technique is particu-larly useful when applied to inductors in which the fabrication process includes integration substrate removal. However, it is also applicable to inductors on low-loss substrates. The method optimizes the width of the metal strip for each turn of the inductor coil, leading to a variable strip-width layout. The optimization procedure has been successfully applied to the design of square spiral inductors in a silicon-based multichip-module technology, complemented with silicon micromachining postprocessing. The obtained experimental results corroborate the validity of the proposed method. A factor of about 17 have b...
Projecte presentat al 5e Premi a la Qualitat de la Gestio Universitaria, convocat pel Consell Soc... more Projecte presentat al 5e Premi a la Qualitat de la Gestio Universitaria, convocat pel Consell Social de la UPC
The fabrication of microsystems in which chemical measurements play a role make the on-chip combi... more The fabrication of microsystems in which chemical measurements play a role make the on-chip combination of chemical sensors and signal processing circuitry highly desirable. Chemical sensors use sensitive layers which are not a part of MOS devices and in this sense, the determination of the best sensors and technological processes to achieve good integrated smart sensors is very important. In
We can distinguish two different approaches to agro-food consumption. The main model follows the ... more We can distinguish two different approaches to agro-food consumption. The main model follows the value chain nutrition rules and it is fo-cused on establishing the quality and product price-stability. At the same time, strengthening the short circuits of commercialization is significant, as an alternative to the main model. These initiatives, which have different working matters, promote the roll to involve consumers in the consequences of their consumption habits. In addition, these types of consumers value direct connection between producers and local stakeholders. In the context of Network Society, ICT adoptions offer a tool to organize these short circuits of commercialization business. This article studies the case of the municipality of Sant Cugat del Vallès, located close to Barcelona metropolitan area and where we can recognise much of the short circuit of commercialization patterns. On the one hand, we are evaluating if the proliferation of these initiatives into the proximity territory can offer a consumption alternative thanks to the interaction between producers and consumers. On the other hand, taking into account the Case of Sant Cugat del Vallès, we are going to analyse the significance of a new pattern between rural and urban space relations through agro-food consumption.
An introduction to ferrofluids in MEMS applications is presented. Ferrofluids are fluids with mag... more An introduction to ferrofluids in MEMS applications is presented. Ferrofluids are fluids with magnetic properties. By applying a magnetic field, the balance of forces within the ferrofluid is varied so that the magnetic fluid can move or apply pressure. These capabilities can be used in the field of the microsystems. In this work, we have obtained the typical values of pressure which can be expected from a ferrofluid. Using a piezoresistive pressure sensor, a pressure of 0.04 bar has been obtained.
IEEE Transactions on Microwave Theory and Techniques, 2000
A systematic method to improve the quality ( ) factor of RF integrated inductors is presented in ... more A systematic method to improve the quality ( ) factor of RF integrated inductors is presented in this paper. The proposed method is based on the layout optimization to minimize the series resistance of the inductor coil, taking into account both ohmic losses, due to conduction currents, and magnetically induced losses, due to Eddy currents. The technique is particularly useful when applied to inductors in which the fabrication process includes integration substrate removal. However, it is also applicable to inductors on low-loss substrates. The method optimizes the width of the metal strip for each turn of the inductor coil, leading to a variable strip-width layout. The optimization procedure has been successfully applied to the design of square spiral inductors in a silicon-based multichip-module technology, complemented with silicon micromachining postprocessing. The obtained experimental results corroborate the validity of the proposed method. A factor of about 17 have been obtained for a 35-nH inductor at 1.5 GHz, with values higher than 40 predicted for a 20-nH inductor working at 3.5 GHz. The latter is up to a 60% better than the best results for a single strip-width inductor working at the same frequency.
A systematic method to improve the quality ( ) factor of RF integrated inductors is presented in ... more A systematic method to improve the quality ( ) factor of RF integrated inductors is presented in this paper. The proposed method is based on the layout optimization to minimize the series resistance of the inductor coil, taking into account both ohmic losses, due to conduction currents, and magnetically induced losses, due to Eddy currents. The technique is particularly useful when applied to inductors in which the fabrication process includes integration substrate removal. However, it is also applicable to inductors on low-loss substrates. The method optimizes the width of the metal strip for each turn of the inductor coil, leading to a variable strip-width layout. The optimization procedure has been successfully applied to the design of square spiral inductors in a silicon-based multichip-module technology, complemented with silicon micromachining postprocessing. The obtained experimental results corroborate the validity of the proposed method. A factor of about 17 have been obtained for a 35-nH inductor at 1.5 GHz, with values higher than 40 predicted for a 20-nH inductor working at 3.5 GHz. The latter is up to a 60% better than the best results for a single strip-width inductor working at the same frequency.
This paper presents a magnetic sensor on thin-film SOI-SIMOX that takes advantage of a previous b... more This paper presents a magnetic sensor on thin-film SOI-SIMOX that takes advantage of a previous bipolar structure, the VCBM (voltage-controlled bipolar MOS transistor) to improve magnetic response with low power consumption. The buried oxide avoids substrate currents, while keeping a high relative sensitivity, up to 50% T− 1, of the sensor. The paper introduces the structure and theoretical operation regions for both electric and magnetic features. Experimental results on two devices validate the previous analysis, presenting ...
“Consumption groups” (or “consumption cooperatives”) is one of the types of short circuits of foo... more “Consumption groups” (or “consumption cooperatives”) is one of the types of short circuits of food consumption. They are organized to create an alternative to the dominant model, the agro-food big chain. Breaking the barriers between consumers and producers, this model of organization strengthens the possibility of stimulating social and economic local development. In this article, we show how consumption groups take advantage of the traditional cooperative movement rooted in the XIXth century, and Information and Communication Technologies (ICT) in the context of Barcelona. We analyse how the Social and Solidary Economy (SSE) measurement indicators are achieved by agro-food consumption groups, the nature of the networks made up by consumers and producers and the relevance of ICTs to maintain the business activity. Using geolocalized data and social network analysis we highlight the significance of local economical connections among the actors involved. Even though consumption groups stimulate local business and correlate with SSE indicators, they are not represented in the design of public policies. This article wants to draw a different point of view in the promotion of alternative food futures as emerging social and economic actors, and the public policies to promote them.
We can distinguish two different approaches to agro-food consumption. The main model follows the ... more We can distinguish two different approaches to agro-food consumption. The main model follows the value chain nutrition rules and it is focused on establishing the quality and product pricestability. At the same time, strengthening the short circuits of commercialization is significant, as an alternative to the main model. These initiatives, which have different working matters, promote the roll to involve consumers in the consequences of their consumption habits. In addition, these types of consumers value direct connection between producers and local stakeholders. In the context of Network Society, ICT adoptions offer a tool to organize these short circuits of commercialization business. This article studies the case of the municipality of Sant Cugat del Vallès, located close to Barcelona metropolitan area and where we can recognise much of the short circuit of commercialization patterns. On the one hand, we are evaluating if the proliferation of these initiatives into the proximit...
Abstract—A systematic method to improve the quality () factor of RF integrated inductors is prese... more Abstract—A systematic method to improve the quality () factor of RF integrated inductors is presented in this paper. The proposed method is based on the layout optimization to minimize the series resistance of the inductor coil, taking into account both ohmic losses, due to conduction currents, and magnetically induced losses, due to Eddy currents. The technique is particu-larly useful when applied to inductors in which the fabrication process includes integration substrate removal. However, it is also applicable to inductors on low-loss substrates. The method optimizes the width of the metal strip for each turn of the inductor coil, leading to a variable strip-width layout. The optimization procedure has been successfully applied to the design of square spiral inductors in a silicon-based multichip-module technology, complemented with silicon micromachining postprocessing. The obtained experimental results corroborate the validity of the proposed method. A factor of about 17 have b...
Projecte presentat al 5e Premi a la Qualitat de la Gestio Universitaria, convocat pel Consell Soc... more Projecte presentat al 5e Premi a la Qualitat de la Gestio Universitaria, convocat pel Consell Social de la UPC
The fabrication of microsystems in which chemical measurements play a role make the on-chip combi... more The fabrication of microsystems in which chemical measurements play a role make the on-chip combination of chemical sensors and signal processing circuitry highly desirable. Chemical sensors use sensitive layers which are not a part of MOS devices and in this sense, the determination of the best sensors and technological processes to achieve good integrated smart sensors is very important. In
We can distinguish two different approaches to agro-food consumption. The main model follows the ... more We can distinguish two different approaches to agro-food consumption. The main model follows the value chain nutrition rules and it is fo-cused on establishing the quality and product price-stability. At the same time, strengthening the short circuits of commercialization is significant, as an alternative to the main model. These initiatives, which have different working matters, promote the roll to involve consumers in the consequences of their consumption habits. In addition, these types of consumers value direct connection between producers and local stakeholders. In the context of Network Society, ICT adoptions offer a tool to organize these short circuits of commercialization business. This article studies the case of the municipality of Sant Cugat del Vallès, located close to Barcelona metropolitan area and where we can recognise much of the short circuit of commercialization patterns. On the one hand, we are evaluating if the proliferation of these initiatives into the proximity territory can offer a consumption alternative thanks to the interaction between producers and consumers. On the other hand, taking into account the Case of Sant Cugat del Vallès, we are going to analyse the significance of a new pattern between rural and urban space relations through agro-food consumption.
An introduction to ferrofluids in MEMS applications is presented. Ferrofluids are fluids with mag... more An introduction to ferrofluids in MEMS applications is presented. Ferrofluids are fluids with magnetic properties. By applying a magnetic field, the balance of forces within the ferrofluid is varied so that the magnetic fluid can move or apply pressure. These capabilities can be used in the field of the microsystems. In this work, we have obtained the typical values of pressure which can be expected from a ferrofluid. Using a piezoresistive pressure sensor, a pressure of 0.04 bar has been obtained.
IEEE Transactions on Microwave Theory and Techniques, 2000
A systematic method to improve the quality ( ) factor of RF integrated inductors is presented in ... more A systematic method to improve the quality ( ) factor of RF integrated inductors is presented in this paper. The proposed method is based on the layout optimization to minimize the series resistance of the inductor coil, taking into account both ohmic losses, due to conduction currents, and magnetically induced losses, due to Eddy currents. The technique is particularly useful when applied to inductors in which the fabrication process includes integration substrate removal. However, it is also applicable to inductors on low-loss substrates. The method optimizes the width of the metal strip for each turn of the inductor coil, leading to a variable strip-width layout. The optimization procedure has been successfully applied to the design of square spiral inductors in a silicon-based multichip-module technology, complemented with silicon micromachining postprocessing. The obtained experimental results corroborate the validity of the proposed method. A factor of about 17 have been obtained for a 35-nH inductor at 1.5 GHz, with values higher than 40 predicted for a 20-nH inductor working at 3.5 GHz. The latter is up to a 60% better than the best results for a single strip-width inductor working at the same frequency.
A systematic method to improve the quality ( ) factor of RF integrated inductors is presented in ... more A systematic method to improve the quality ( ) factor of RF integrated inductors is presented in this paper. The proposed method is based on the layout optimization to minimize the series resistance of the inductor coil, taking into account both ohmic losses, due to conduction currents, and magnetically induced losses, due to Eddy currents. The technique is particularly useful when applied to inductors in which the fabrication process includes integration substrate removal. However, it is also applicable to inductors on low-loss substrates. The method optimizes the width of the metal strip for each turn of the inductor coil, leading to a variable strip-width layout. The optimization procedure has been successfully applied to the design of square spiral inductors in a silicon-based multichip-module technology, complemented with silicon micromachining postprocessing. The obtained experimental results corroborate the validity of the proposed method. A factor of about 17 have been obtained for a 35-nH inductor at 1.5 GHz, with values higher than 40 predicted for a 20-nH inductor working at 3.5 GHz. The latter is up to a 60% better than the best results for a single strip-width inductor working at the same frequency.
This paper presents a magnetic sensor on thin-film SOI-SIMOX that takes advantage of a previous b... more This paper presents a magnetic sensor on thin-film SOI-SIMOX that takes advantage of a previous bipolar structure, the VCBM (voltage-controlled bipolar MOS transistor) to improve magnetic response with low power consumption. The buried oxide avoids substrate currents, while keeping a high relative sensitivity, up to 50% T− 1, of the sensor. The paper introduces the structure and theoretical operation regions for both electric and magnetic features. Experimental results on two devices validate the previous analysis, presenting ...
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Papers by Pere Losantos