7,174 research outputs found
Business incubators as allied in reducing the transaction costs in Mexican entrepreneurs
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
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
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
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
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
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
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
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. Catalysis Today. 345:22-26. https://doi.org/10.1016/j.cattod.2019.12.001S2226345Serhan, N., Tsolakis, A., Wahbi, A., Martos, F. J., & Golunski, S. (2019). Modifying catalytically the soot morphology and nanostructure in diesel exhaust: Influence of silver De-NOx catalyst (Ag/Al2O3). Applied Catalysis B: Environmental, 241, 471-482. doi:10.1016/j.apcatb.2018.09.068Góra-Marek, K., Tarach, K. A., Piwowarska, Z., Łaniecki, M., & Chmielarz, L. (2016). Ag-loaded zeolites Y and USY as catalysts for selective ammonia oxidation. Catalysis Science & Technology, 6(6), 1651-1660. doi:10.1039/c5cy01446hHu, X., Bai, J., Hong, H., & Li, C. (2016). Supercritical carbon dioxide anchored highly dispersed silver nanoparticles on 4A-zeolite and selective oxidation of styrene performance. CrystEngComm, 18(14), 2469-2476. doi:10.1039/c5ce02435hCerrillo, J. L., Palomares, A. E., Rey, F., Valencia, S., Pérez-Gago, M. B., Villamón, D., & Palou, L. (2018). Functional Ag-Exchanged Zeolites as Biocide Agents. ChemistrySelect, 3(17), 4676-4682. doi:10.1002/slct.201800432Dong, X.-Y., Gao, Z.-W., Yang, K.-F., Zhang, W.-Q., & Xu, L.-W. (2015). Nanosilver as a new generation of silver catalysts in organic transformations for efficient synthesis of fine chemicals. Catalysis Science & Technology, 5(5), 2554-2574. doi:10.1039/c5cy00285kSulaiman, K. O., Sudheeshkumar, V., & Scott, R. W. J. (2019). Activation of atomically precise silver clusters on carbon supports for styrene oxidation reactions. RSC Advances, 9(48), 28019-28027. doi:10.1039/c9ra05566eCoutiño-Gonzalez, E., Baekelant, W., Steele, J. A., Kim, C. W., Roeffaers, M. B. J., & Hofkens, J. (2017). Silver Clusters in Zeolites: From Self-Assembly to Ground-Breaking Luminescent Properties. Accounts of Chemical Research, 50(9), 2353-2361. doi:10.1021/acs.accounts.7b00295Liu, L., & Corma, A. (2018). Metal Catalysts for Heterogeneous Catalysis: From Single Atoms to Nanoclusters and Nanoparticles. 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. ChemCatChem, 3(1), 24-65. doi:10.1002/cctc.201000378Soliman, N. K. (2019). Factors affecting CO oxidation reaction over nanosized materials: A review. Journal of Materials Research and Technology, 8(2), 2395-2407. doi:10.1016/j.jmrt.2018.12.012Du, M., Sun, D., Yang, H., Huang, J., Jing, X., Odoom-Wubah, T., … Li, Q. (2014). Influence of Au Particle Size on Au/TiO2 Catalysts for CO Oxidation. The Journal of Physical Chemistry C, 118(33), 19150-19157. doi:10.1021/jp504681fCorma, A., Fornés, V., Guil, J. ., Pergher, S., Maesen, T. L. ., & Buglass, J. . (2000). Preparation, characterisation and catalytic activity of ITQ-2, a delaminated zeolite. Microporous and Mesoporous Materials, 38(2-3), 301-309. doi:10.1016/s1387-1811(00)00149-9Joshi, C. P., Bootharaju, M. S., Alhilaly, M. J., & Bakr, O. M. (2015). [Ag25(SR)18]−: The «Golden» Silver Nanoparticle. Journal of the American Chemical Society, 137(36), 11578-11581. doi:10.1021/jacs.5b07088Aspromonte, S. G., Mizrahi, M. D., Schneeberger, F. 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). Research highlights: speciation and transformations of silver released from Ag NPs in three species. Environmental Science: Nano, 3(6), 1236-1240. doi:10.1039/c6en90025aShimizu, K., Sugino, K., Kato, K., Yokota, S., Okumura, K., & Satsuma, A. (2007). Formation and Redispersion of Silver Clusters in Ag-MFI Zeolite as Investigated by Time-Resolved QXAFS and UV−Vis. The Journal of Physical Chemistry C, 111(4), 1683-1688. doi:10.1021/jp066995aChen, D., Qu, Z., Shen, S., Li, X., Shi, Y., Wang, Y., … Wu, J. (2011). Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde. Catalysis Today, 175(1), 338-345. doi:10.1016/j.cattod.2011.03.059Schuricht, F., & Reschetilowski, W. (2012). Simultaneous selective catalytic reduction (SCR) of NOx and N2O over Ag/ZSM-5 – Catalytic studies and mechanistic implications. Microporous and Mesoporous Materials, 164, 135-144. doi:10.1016/j.micromeso.2012.07.018Akolekar, D. B., & Bhargava, S. K. (2000). Adsorption of NO and CO on silver-exchanged microporous materials. Journal of Molecular Catalysis A: Chemical, 157(1-2), 199-206. doi:10.1016/s1381-1169(00)00055-8Liu, J., Krishna, K. S., Kumara, C., Chattopadhyay, S., Shibata, T., Dass, A., & Kumar, C. S. S. R. (2016). Understanding Au∼98Ag∼46(SR)60 nanoclusters through investigation of their electronic and local structure by X-ray absorption fine structure. RSC Advances, 6(30), 25368-25374. doi:10.1039/c5ra27396jChevrier, D. M., Yang, R., Chatt, A., & Zhang, P. (2015). Bonding properties of thiolate-protected gold nanoclusters and structural analogs from X-ray absorption spectroscopy. Nanotechnology Reviews, 4(2). doi:10.1515/ntrev-2015-0007Yamazoe, S., & Tsukuda, T. (2019). X-ray Absorption Spectroscopy on Atomically Precise Metal Clusters. Bulletin of the Chemical Society of Japan, 92(1), 193-204. doi:10.1246/bcsj.2018028
The Effect of Number of Arms on the Aggregation Behavior of Thermoresponsive Poly(N-isopropylacrylamide) Star Polymers
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
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
- …