7,174 research outputs found

    Business incubators as allied in reducing the transaction costs in Mexican entrepreneurs

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    Purpose- Strategic alliances are given by voluntary agreement between the parties, and have various forms, means and objectives which exist. In this text, the incubators as potential allies for entrepre-neurs in the creation process of the company and as a cause of reduction of transaction costs in the process, where the relationship between the two sides have discussed them generates benefits of vari-ous natures. While it is not set as the union of both, if it looks like the relationship and close contact, as a network, which allows the incubator to survive and achieve its objective and entrepreneurial reduce the risk of birth as a company, in addition to build networks with other companies, organiza-tions or institutions and ease of financing, and even the possibility of investors. Design/methodology/approach- The method used for this paper is based on the analyses of official documents of the institutions referred, some studies on entrepreneurship and startups, and finally available data on new firms and institutions as RedJal and INEGI. In addition, incubators and studies on such cases were also reviewed to learn about the experience, services and working methods of these. This focused on observing what happens in Mexico about. Findings- Business incubators in Mexico use to be strategic partners for entrepreneurs that enable the latter to reduce their transaction costs to startup a new company. Business incubators are also important to reduce the risk of death of the company and reduce uncertainty in the process. Also, the services provided, experience and expertise by incubators are important for a growing business arises with the required formality and according to the law, of course protecting its intellectual property and creating an image that pays to create its own reputation. Conceptual Paper Reference to this paper should be made as follows: Vargas-Hernández, J. G., and Garcia Magaña, R.S. (2014). “Business incubators as allied in reducing the transaction costs in Mexican entrepre-neurs”, Journal of Entrepreneurship, Business and Economics, Vol. 2, No. 2, pp. 1–9

    The Link Between a Firm´s Internal Characteristics and Performance: GPTW & VRIO Dimension Analysis

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    The following article addresses the models of Dr. Jay Barney, author of the article “Firm Resources and Sustained Competitive Advantage” and Robert Levering, author of the book “A Great Place to Work”, which deals with the internal characteristics of companies and how they impact on the performance of it. We analyze the dimensions of Value, Rarity, Imitation and Use of Dr. Jay Barney’s VRIO model and the dimensions of Respect, Credibility, Equity, Pride and Camaraderie through the Trust of Robert Levering’s model, as indicators of the company’s performance. This document conceptually describes theoretical arguments of these authors, why organizations need to focus on their internal characteristics, in order to improve their performance. The hypothesis is that the internal characteristics of the organization and its management impact on the performance of the company. The models of both authors provide extensive data on the positive relationship between the internal characteristics of the company and its performance

    Bounds on the Wilson Dirac Operator

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    New exact upper and lower bounds are derived on the spectrum of the square of the hermitian Wilson Dirac operator. It is hoped that the derivations and the results will be of help in the search for ways to reduce the cost of simulations using the overlap Dirac operator. The bounds also apply to the Wilson Dirac operator in odd dimensions and are therefore relevant to domain wall fermions as well.Comment: 16 pages, TeX, 3 eps figures, small corrections and improvement

    Impact of the new handling recommendations for hazardous drugs in a hospital pharmacy service

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    Objective: To describe the actions taken by the Pharmacy Unit in a tertiary hospital in order to adapt to the recommendations established by NIOSH 2014 for handling Hazardous Drugs. Method: A retrospective observational study. A list was prepared including all hazardous drugs according to NIOSH 2014 that were available at the hospital as marketed or foreign drugs, or used in clinical trials, and there was a review of the processes of acquisition, repackaging, preparation, circuits, organizational, dispensing and identification. Results: After the analysis, a report including all needs was prepared and sent to the Hospital Management. Any relevant information about the handling and administration of hazardous drugs was included in the prescription computer program. There were changes in the acquisition process of two drugs, in order to avoid splitting and multi-dose formulations. An alternative or improvement was found for 35 253 of the 75 779 units of hazardous drugs repackaged in one year. The Pharmacy Unit took over the preparation of four non-sterile medications, as well as the preparation of all sterile parenteral medications included in Lists 1 and 2 that were not previously prepared there, as well as one from List 3. Information was also included about the preparation processes of Magistral Formulations that involved hazardous drugs from Lists 2 or 3

    Effectiveness of HIIT compared to moderate continuous training in improving vascular parameters in inactive adults

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    Background: Strong evidence shows that physical inactivity increases the risk of many adverse health conditions, including major non-communicable diseases, such as cardiovascular disease (CVD), metabolic syndrome, and breast and colon cancers, and shortens life expectancy. We aimed to determine the effects of moderate (MCT)- versus high-intensity interval training (HIT) on vascular function parameters in physically inactive adults. We hypothesized that individualized HIT prescription would improve the vascular function parameters more than the MCT in a greater proportion of individuals. Methods: Twenty-one inactive adults were randomly allocated to receive either MCT group (60-75% of their heart rate reserve, [HRR] or HIT group (4 min at 85-95% of peak HRR), 3 days a week for 12 weeks. Vascular function (brachial artery flow-mediated dilation, FMD [%], normalized brachial artery flow-mediated dilation, FMDn [%], aortic pulse wave velocity, PWV [m·s - 1 ], AIx, augmentation index: aortic and brachial [%]), were measured at baseline and over 12 weeks of training. In order for a participant to be considered a responder to improvements in vascular function parameters (FMDn and PWV), the typical error was calculated in a favorable direction. Results: FMD changed by - 1.0% (SE 2.1, d = 0.388) in the MCT group, and + 1.8% (SE 1.8, d = 0.699) in the HIT group (no significant difference between groups: 2.9% [95% CI, - 3.0 to 8.8]. PWV changed by + 0.1 m·s - 1 (SE 0.2, d = 0.087) in the MCT group but decreased by - 0.4 m·s - 1 in the HIT group (SE 0.2, d = 0.497), with significant difference between groups: - 0.4 [95% CI, - 0.2 to - 0.7]. There was not a significant difference in the prevalence of no-responder for FMD (%) between the MCT and HIT groups (66% versus 36%, P = 0.157). Regarding PWV (m·s - 1 ), an analysis showed that the prevalence of no-responder was 77% (7 cases) in the MCT group and 45% (5 cases) in the HIT group (P = 0.114). Conclusions: Under the conditions of the present study, both groups experienced changed in vascular function parameters. Compared to MCT group, HIT is more efficacious for improving FMD and decreasing PWV, in physically inactive adults. Trial registration: ClinicalTrials.gov NCT02738385 registered on 23 March 2016. © 2019 The Author(s)

    Microscopic Model of Charge Carrier Transfer in Complex Media

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    We present a microscopic model of a charge carrier transfer under an action of a constant electric field in a complex medium. Generalizing previous theoretical approaches, we model the dynamical environment hindering the carrier motion by dynamic percolation, i.e., as a medium comprising particles which move randomly on a simple cubic lattice, constrained by hard-core exclusion, and may spontaneously annihilate and re-appear at some prescribed rates. We determine analytically the density profiles of the "environment" particles, as seen from the stationary moving charge carrier, and calculate its terminal velocity as the function of the applied field and other system parameters. We realize that for sufficiently small external fields the force exerted on the carrier by the "environment" particles shows a viscous-like behavior and define an analog of the Stokes formula for such dynamic percolative environments. The corresponding friction coefficient is also derived.Comment: appearing in Chem. Phys. Special Issue on Molecular Charge Transfer in Condensed Media - from Physics and Chemistry to Biology and Nano-Engineering, edited by A.Kornyshev (Imperial College London), M.Newton (Brookhaven Natl Lab) and J.Ulstrup (Technical University of Denmark

    Combinatorial RNA Design: Designability and Structure-Approximating Algorithm

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    In this work, we consider the Combinatorial RNA Design problem, a minimal instance of the RNA design problem which aims at finding a sequence that admits a given target as its unique base pair maximizing structure. We provide complete characterizations for the structures that can be designed using restricted alphabets. Under a classic four-letter alphabet, we provide a complete characterization of designable structures without unpaired bases. When unpaired bases are allowed, we provide partial characterizations for classes of designable/undesignable structures, and show that the class of designable structures is closed under the stutter operation. Membership of a given structure to any of the classes can be tested in linear time and, for positive instances, a solution can be found in linear time. Finally, we consider a structure-approximating version of the problem that allows to extend bands (helices) and, assuming that the input structure avoids two motifs, we provide a linear-time algorithm that produces a designable structure with at most twice more base pairs than the input structure.Comment: CPM - 26th Annual Symposium on Combinatorial Pattern Matching, Jun 2015, Ischia Island, Italy. LNCS, 201

    Evaluation of the silver species nature in Ag-ITQ2 zeolites by the CO oxidation reaction

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    The authors thank the Spanish Ministry of Economy and Competitiveness through RTI2018-101784-B-I00 (MINECO/FEDER) and SEV-2016-0683 projects for the financial support. We gratefully acknowledge ALBA synchrotron for allocating beamtime (proposal 2015091414) and the CLAESS beamline staff for their help and technical support during our experiment. CG and NB thank the TUW Innovative Project GIP165CDGC. CG, SP, VT, NB and GR are thankful for financial support from the Austrian Science Fund (FWF) through projects DK+ Solids4Fun (W1243) and ComCat (I 1041-N28). I. Lopez Hernandez is grateful to Generalitat Valenciana and European Social Fund for the pre doctoral grant ACIF2017.López-Hernández, I.; García Yago, CI.; Truttmann, V.; Pollit, S.; Barrabés, N.; Rupprechter, G.; Rey Garcia, F.... (2020). Evaluation of the silver species nature in Ag-ITQ2 zeolites by the CO oxidation reaction. 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Chemical Reviews, 118(10), 4981-5079. doi:10.1021/acs.chemrev.7b00776Zhao, J., & Jin, R. (2018). Heterogeneous catalysis by gold and gold-based bimetal nanoclusters. Nano Today, 18, 86-102. doi:10.1016/j.nantod.2017.12.009Zhang, B., Kaziz, S., Li, H., Hevia, M. G., Wodka, D., Mazet, C., … Barrabés, N. (2015). Modulation of Active Sites in Supported Au38(SC2H4Ph)24 Cluster Catalysts: Effect of Atmosphere and Support Material. The Journal of Physical Chemistry C, 119(20), 11193-11199. doi:10.1021/jp512022vZhang, B., Sels, A., Salassa, G., Pollitt, S., Truttmann, V., Rameshan, C., … Barrabés, N. (2018). Ligand Migration from Cluster to Support: A Crucial Factor for Catalysis by Thiolate‐protected Gold Clusters. ChemCatChem, 10(23), 5372-5376. doi:10.1002/cctc.201801474Natarajan, G., Mathew, A., Negishi, Y., Whetten, R. L., & Pradeep, T. (2015). A Unified Framework for Understanding the Structure and Modifications of Atomically Precise Monolayer Protected Gold Clusters. The Journal of Physical Chemistry C, 119(49), 27768-27785. doi:10.1021/acs.jpcc.5b08193Tsukuda, T., & Häkkinen, H. (2015). Introduction. Protected Metal Clusters - From Fundamentals to Applications, 1-7. doi:10.1016/b978-0-08-100086-1.00001-4Zhang, X., Qu, Z., Li, X., Wen, M., Quan, X., Ma, D., & Wu, J. (2010). Studies of silver species for low-temperature CO oxidation on Ag/SiO2 catalysts. Separation and Purification Technology, 72(3), 395-400. doi:10.1016/j.seppur.2010.03.012Kolobova, E., Pestryakov, A., Mamontov, G., Kotolevich, Y., Bogdanchikova, N., Farias, M., … Cortes Corberan, V. (2017). Low-temperature CO oxidation on Ag/ZSM-5 catalysts: Influence of Si/Al ratio and redox pretreatments on formation of silver active sites. Fuel, 188, 121-131. doi:10.1016/j.fuel.2016.10.037Ausavasukhi, A., Suwannaran, S., Limtrakul, J., & Sooknoi, T. (2008). Reversible interconversion behavior of Ag species in AgHZSM-5: XRD, 1H MAS NMR, TPR, TPHE, and catalytic studies. Applied Catalysis A: General, 345(1), 89-96. doi:10.1016/j.apcata.2008.04.026Shi, C., Cheng, M., Qu, Z., & Bao, X. (2005). On the correlation between microstructural changes of Ag-H-ZSM-5 catalysts and their catalytic performances in the selective catalytic reduction of NOx by methane. Journal of Molecular Catalysis A: Chemical, 235(1-2), 35-43. doi:10.1016/j.molcata.2004.10.045Afanasev, D. S., Yakovina, O. A., Kuznetsova, N. I., & Lisitsyn, A. S. (2012). High activity in CO oxidation of Ag nanoparticles supported on fumed silica. Catalysis Communications, 22, 43-47. doi:10.1016/j.catcom.2012.02.014Kolobova, E., Pestryakov, A., Shemeryankina, A., Kotolevich, Y., Martynyuk, O., Tiznado Vazquez, H. J., & Bogdanchikova, N. (2014). Formation of silver active states in Ag/ZSM-5 catalysts for CO oxidation. Fuel, 138, 65-71. doi:10.1016/j.fuel.2014.07.011Royer, S., & Duprez, D. (2010). Catalytic Oxidation of Carbon Monoxide over Transition Metal Oxides. 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A., López, J. M. R., & Boix, A. V. (2013). Study of the Nature and Location of Silver in Ag-Exchanged Mordenite Catalysts. Characterization by Spectroscopic Techniques. The Journal of Physical Chemistry C, 117(48), 25433-25442. doi:10.1021/jp4046269Veronesi, G., Deniaud, A., Gallon, T., Jouneau, P.-H., Villanova, J., Delangle, P., … Michaud-Soret, I. (2016). Visualization, quantification and coordination of Ag+ions released from silver nanoparticles in hepatocytes. Nanoscale, 8(38), 17012-17021. doi:10.1039/c6nr04381jVeronesi, G., Aude-Garcia, C., Kieffer, I., Gallon, T., Delangle, P., Herlin-Boime, N., … Carrière, M. (2015). Exposure-dependent Ag+release from silver nanoparticles and its complexation in AgS2sites in primary murine macrophages. Nanoscale, 7(16), 7323-7330. doi:10.1039/c5nr00353aHudson-Smith, N. V., Clement, P. L., Brown, R. P., Krause, M. O. P., Pedersen, J. A., & Haynes, C. L. (2016). 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    The Effect of Number of Arms on the Aggregation Behavior of Thermoresponsive Poly(N-isopropylacrylamide) Star Polymers

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    The thermoresponsive nature of aqueous solutions of poly(N‐isopropylacrylamide) (PNIPAAM) star polymers containing 2, 3, 4, and 6 arms has been investigated by turbidity, dynamic light scattering, rheology, and rheo‐SALS. Simulations of the thermosensitive nature of the single star polymers have also been conducted. Some of the samples form aggregates even at temperatures significantly below the lower critical solution temperature (LCST) of PNIPAAM. Increasing concentration and number of arms promotes associations at low temperatures. When the temperature is raised, there is a competition between size increase due to enhanced aggregation and a size reduction caused by contraction. Monte Carlo simulations show that the single stars contract with increasing temperature, and that this contraction is more pronounced when the number of arms is increased. Some samples exhibit a minimum in the turbidity data after the initial increase at the cloud point. The combined rheology and rheo‐SALS data suggest that this is due to a fragmentation of the aggregates followed by re‐aggregation at even higher temperatures. Although the 6‐arm star polymer aggregates more than the other stars at low temperatures, the more compact structure renders it less prone to aggregation at temperatures above the cloud point.publishedVersio

    Polarisation Patterns and Vectorial Defects in Type II Optical Parametric Oscillators

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    Previous studies of lasers and nonlinear resonators have revealed that the polarisation degree of freedom allows for the formation of polarisation patterns and novel localized structures, such as vectorial defects. Type II optical parametric oscillators are characterised by the fact that the down-converted beams are emitted in orthogonal polarisations. In this paper we show the results of the study of pattern and defect formation and dynamics in a Type II degenerate optical parametric oscillator for which the pump field is not resonated in the cavity. We find that traveling waves are the predominant solutions and that the defects are vectorial dislocations which appear at the boundaries of the regions where traveling waves of different phase or wave-vector orientation are formed. A dislocation is defined by two topological charges, one associated with the phase and another with the wave-vector orientation. We also show how to stabilize a single defect in a realistic experimental situation. The effects of phase mismatch of nonlinear interaction are finally considered.Comment: 38 pages, including 15 figures, LATeX. Related material, including movies, can be obtained from http://www.imedea.uib.es/Nonlinear/research_topics/OPO
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