Instituto Politécnico Nacional

About: Instituto Politécnico Nacional is a education organization based out in Mexico City, Mexico. It is known for research contribution in the topics: Population & Control theory. The organization has 43351 authors who have published 63315 publications receiving 938532 citations. The organization is also known as: Instituto Politécnico Nacional & Instituto Politecnico Nacional.

Partner geographic and organizational proximity and the innovative performance of knowledge-creating alliances

Abstract: We adopt a knowledge-based perspective to investigate the individual and interaction effects of partner geographic and organizational proximity on the innovative performance of knowledge-creating alliances. Our econometric analysis on a sample of 1,515 interfirm dyadic knowledge-creating R&D alliances shows that both geographic distance between allied firms and their affiliation with the same business group negatively affect the alliance innovative performance. However, when jointly considered, the two examined partner characteristics positively moderate each other’s effect on alliance innovative performance, so revealing a complementary effect on it. We argue that, while the existence of group ties between geographically distant organizations reduces the negative influence of geographic distance on the partners’ ability to integrate their knowledge within the alliance, collaborating with remote partners weakens the negative influence of the existence of group ties between partners on knowledge diversity in alliances. We conclude that geographic distance and organizational proximity are contingent upon one another in their effect on the innovative performance of knowledge-creating alliances and that distance (proximity) in one dimension can be bridged (overcome) by proximity (distance) in another dimension.

Understanding the gastrointestinal tract of the elderly to develop dietary solutions that prevent malnutrition.

Abstract: // Didier Remond 1, 2 , Danit R. Shahar 3 , Doreen Gille 4 , Paula Pinto 5, 6 , Josefa Kachal 7 , Marie-Agnes Peyron 1, 2 , Claudia Nunes Dos Santos 6, 8 , Barbara Walther 4 , Alessandra Bordoni 9 , Didier Dupont 10 , Lidia Tomas-Cobos 11 , Guy Vergeres 4 1 UMR 1019, UNH, CRNH Auvergne, INRA, 63000 Clermont-Ferrand, France 2 Clermont Universite, Universite d’Auvergne, Unite de Nutrition Humaine, BP 10448, 63000 Clermont-Ferrand, France 3 Department of Public Health, The S. Daniel Abraham International Center for Health and Nutrition, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel 4 Institute for Food Sciences IFS, Agroscope, Federal Department of Economic Affairs, Education and Research EAER, 3003 Berne, Switzerland 5 Escola Superior Agraria, Insituto Politecnico de Santarem, 2001-904 Santarem, Portugal 6 Instituto de Tecnologia Quimica e Biologica, Universidade Nova de Lisboa, 2780-157 Oeiras, Portugal 7 Israeli Ministry of Health, 93591 Jerusalem, Israel 8 Instituto de Biologia Experimental e Tecnologica, 2780-157 Oeiras, Portugal 9 Department of Agri-Food Sciences and Technologies, University of Bologna, 47521 Cesena, Italy 10 UMR 1253, Science et Technologie du Lait & de l’Œuf, INRA, 35000 Rennes, France 11 ainia Centro Tecnologico, E46980 Paterna (Valencia), Spain Correspondence to: Guy Vergeres, e-mail: guy.vergeres@agroscope.admin.ch Keywords: malnutrition, gastrointestinal tract, aging, dietary solutions, gerotarget Received: May 06, 2015 Accepted: May 13, 2015 Published: May 27, 2015 ABSTRACT Although the prevalence of malnutrition in the old age is increasing worldwide a synthetic understanding of the impact of aging on the intake, digestion, and absorption of nutrients is still lacking. This review article aims at filling the gap in knowledge between the functional decline of the aging gastrointestinal tract (GIT) and the consequences of malnutrition on the health status of elderly. Changes in the aging GIT include the mechanical disintegration of food, gastrointestinal motor function, food transit, chemical food digestion, and functionality of the intestinal wall. These alterations progressively decrease the ability of the GIT to provide the aging organism with adequate levels of nutrients, what contributes to the development of malnutrition. Malnutrition, in turn, increases the risks for the development of a range of pathologies associated with most organ systems, in particular the nervous-, muscoskeletal-, cardiovascular-, immune-, and skin systems. In addition to psychological, economics, and societal factors, dietary solutions preventing malnutrition should thus propose dietary guidelines and food products that integrate knowledge on the functionality of the aging GIT and the nutritional status of the elderly. Achieving this goal will request the identification, validation, and correlative analysis of biomarkers of food intake, nutrient bioavailability, and malnutrition.

Combination of the top-quark mass measurements from the Tevatron collider

Abstract: We thank the Fermilab staff and technical staffs of the participating institutions for their vital contributions and acknowledge support from the DOE and NSF (USA), ARC (Australia), CNPq, FAPERJ, FAPESP, and FUNDUNESP (Brazil), NSERC (Canada), NSC, CAS, and CNSF (China), Colciencias (Colombia), MSMT and GACR (Czech Republic), the Academy of Finland, CEA, and CNRS/IN2P3 (France), BMBF and DFG (Germany), DAE and DST (India), SFI (Ireland), INFN (Italy), MEXT (Japan), the Korean World Class University Program and NRF (Korea), CONACyT (Mexico), FOM (Netherlands), MON, NRC KI, and RFBR (Russia), the Slovak R&D Agency, the Ministerio de Ciencia e Innovacio´n, and Programa Consolider-Ingenio 2010 (Spain), The Swedish Research Council (Sweden), SNSF (Switzerland), STFC and the Royal Society (United Kingdom), and the A. P. Sloan Foundation (USA).

Simultaneous measurement of refractive index and temperature using a SPR-based fiber optic sensor

Abstract: A surface plasmon resonance-based fiber-optic sensor for simultaneous measurement of refractive index and temperature of liquid samples is proposed and experimentally demonstrated. The sensor consists of a gold-coated MM-SM-MM optical fiber structure, whose sensitive section was partially covered with polydimethylsiloxane (PDMS) to generate two independent SPR resonance dips in the fiber transmission spectrum. One of the dips is generated by the bare gold-coated fiber section whose wavelength resonance is tuned by the refractive index and temperature of the surrounding medium. The other dip that is exclusively used to monitor the temperature variations of the liquid sample, whose central wavelength at 900 nm corresponds to PDMS refractive index at 20 °C, is produced by the polymerized gold-coated fiber section. The high refractive index and temperature sensitivity achieved, 2323.4 nm/RIU and −2.850 nm/°C respectively, the small size, the ease fabrication process, and the bio-compatibility of the proposed device are appealing characteristics that makes it ideal for practical bio-sensing applications.

HetNets Powered by Renewable Energy Sources: Sustainable Next-Generation Cellular Networks

Abstract: Renewable energy could be the key for sustainable next-generation cellular networks. The authors' approach would let mobile operators feed base stations in a heterogeneous network using renewable energy sources. The authors compare their method to a classical grid-powered solution. They evaluate costs and CO2 emissions savings for different scenarios to demonstrate that properly powering a heterogeneous network with renewable energy can be a sustainable and economically convenient solution.