Footprints in the sand: What can globular clusters tell us about NGC 4753 past?

NGC 4753 is a bright (M_V approx -22.3) lenticular galaxy. It is a very interesting target to test different theories of formation of lenticular galaxies, due to its low-density environment and complex structure. We perform the first comprehensive study of NGC 4753 globular cluster system (GCS), using Gemini/GMOS and CTIO/MosaicII images. Our results indicate a rather poor GCS of approx 1000 members. Its azimuthal distribution follows the shape of the galaxy bulge. The GC colour distribution is peculiar, presenting an intermediate subpopulation in addition to blue and red ones. This intermediate subgroup can be explained by a single stellar population with an age of 1.5-3 Gyr and 0.5-1 Z_o. The GC specific frequency S_N = 1.3+/-0.15 is surprisingly low for a galaxy of its class. The GC luminosity function (GCLF) is also peculiar, with an excess of bright GCs compared to the expected gaussian distribution. The underlying galaxy body has significant substructure, with remnants of spiral arms, dust filaments, and isophote twisting. This, and the fact that NGC 4753 hosted two type Ia SNe, support the possibility that the intermediate GC subpopulation may have originated during a recent merger, 1-3 Gyr ago.Comment: 10 pages, 10 figures, accepted on MNRA

Tipificació de dos noms Cavanillesians, Galium Fruticescens (Rubiaceae) i Scorzonera pumila (Compositae)

The Cavanillesian names Galium fruticescens and Scorzonera pumila, basionym of Launaea pumila, are lectotypified from original specimens preserved in the Cavanilles herbarium in the Royal Botanic Garden of Madrid (MA).Els noms cavanillesians Galium fruticescens i Scorzonera pumila, basiònim de Launaea pumila, són lectotipificats a partir d’espècimens que pertanyen al material original de l’autor conservat a l’herbari del Reial Jardí Botànic de Madrid (MA)

Retaliatory entry: Determinants of entry as a competitive response

Market entry has been considered as a retaliatory movement. Nevertheless, studies that analyze market entry often consider the entry into a rivals market as a competitive attack. Since actions and reactions are two different competitive movements, factors that determine entry as an attack may be different from those that lead to entering as a response. In this study, we center on retaliatory entry and we analyze how multimarket contact (MMC) between the attacker and the attacked firms and the competitive pressure that the attacker exert on the attacked firms determine this kind of entry. Moreover, we study how the competitive pressure of the attackers moderates the relationship between MMC and retaliatory entry. We test our hypotheses in the mobile telecommunications industry. The results confirm that MMC between the attacker and the attacked firms increases the likelihood of retaliatory entry. Additionally, we find that the greater competitive pressure of the attackers on the focal firm, the more likely the attacked firm is to make a retaliatory entry. However, our results do not show that the competitive pressure of the attackers moderates the relationship between MMC and retaliatory entry

When does high institutional quality explain the presence of MNEs in a foreign country? experiential and vicarious learning as boundary conditions

Institutional economics theory predicts that multinational enterprises (MNEs) operate in foreign countries with high institutional quality, which is known as the institutional profile effect. Nevertheless, the predictions of this theory seem to diverge from the international presence of certain MNEs, raising questions about the broader applicability of the institutional profile effect. We posit that the phenomenon of learning by MNEs offers an explanation for the occasional ineffectiveness of the institutional profile effect in specific contexts. Thus, we seek to answer the following research question: What types of learning reduce the probability of MNEs operating in countries with high institutional quality? To address this question, we investigate the role of experiential and vicarious learning as boundary conditions for the institutional profile effect, and compare their respective effects. Through our empirical analysis of a sample comprising 60 telecommunications MNEs, 39 home countries, and 145 host countries, we find that both experiential and vicarious learning have a negative moderating effect on the institutional profile effect. Furthermore, our findings indicate the existence of a cumulative effect resulting from the combination of different types of learning

Multimarket pioneers: Does multimarket contact improve their performance?

First-mover advantages (FMA) and multimarket contact (MMC) have evolved independently in the strategic management literature. This is surprising because FMA erode as a result of competition which, in turn, is affected by MMC. This paper links these literatures through the concept of spheres of influence and analyses the effect of MMC on pioneers'' profitability. We use the order of market entry to identify spheres of influence and to determine their distribution among multimarket firms. The distribution of spheres of influence allows us to distinguish between reciprocal MMC and non-reciprocal MMC and to study how each of them determines pioneers'' profitability. We test our hypotheses in the mobile telecommunications industry. Our findings show that reciprocal MMC has a positive effect on pioneers’ results, but non-reciprocal MMC negatively affects them

Design with use of 3D printing technology

[EN] Dynamic development of 3D printing technology contributes to its wide applicability. FDM (Fused Deposition Method) is the most known and popular 3D printing method due to its availability and affordability. It is also usable in design of technical objects-to verify design concepts with use of 3D printed prototypes. The prototypes are produced at lower cost and shorter time comparing to other manufacturing methods and might be used for a number of purposes depending on designed object's features they reflect. In the article, usability of 3D printing method FDM for designing of technical objects is verified based on sample functional prototypes. Methodology applied to develop these prototypes and their stand tests are covered. General conclusion is that 3D printed prototypes manufactured with FDM method proved to be useful for verifying new concepts within design processes carried out in KOMAG.Rozmus, M.; Dobrzaniecki, P.; Siegmund, M.; Gómez Herrero, JA. (2020). Design with use of 3D printing technology. Management Systems in Production Engineering. 28(4):283-291. https://doi.org/10.2478/mspe-2020-0040S283291284[1] A. Alafaghani, A. Qattawi. “Investigating the effect of fused deposition modeling processing parameters using Taguchi design of experiment method.” Journal of Manufacturing Processes, vol. 36, pp. 164-174, Dec. 2018[2] D. Bałaga, M. Kalita, M. Siegmund. „Use of 3D additive manufacturing technology for rapid prototyping of spraying nozzles”. Mining Machines, vol. 3 pp. 3-13, Sep. 2017.[3] C. Baletti, M. Ballarin, F. Guerra. “3D printing: State of the art and future perspectives.” Journal of Cultural Heritage, vol. 26, pp. 172-182, Mar. 2017[4] C. Buchanan, L. Gardner. “Metal 3D printing in construction: a review of methods research, applications, opportunities and challenges.” Engineering Structures, vol. 180, pp. 332-348, Feb. 2019.[5] J. M. Chacon, M. A. Caminero, E. Garcia-Plaza, P. J. Nunez. “Additive manufacturing of PLA structures using fused deposition modelling: Effect of process parameters on mechanical properties and their optimal selection.” Materials and Design, vol. 124, pp. 143-157, Jun. 2017.[6] P. Dobrzaniecki, M. Kalita. „Possibility of using the neodymium magnets in machines and equipment clutches”, Mining Machines, vol. 4, pp. 27-38, Dec. 2018.[7] S. Ford, T. Minshall. “Invited review article: Where and how 3D printing is used in teaching and education.” Additive Manufacturing, vol. 25, pp. 131-150, Jan. 2019.[8] A.W. Gebisa, H. G. Lemu. “Influence of 3D Printing FDM Process Parameters on Tensile Property of ULTEM 9085.”, Procedia Manufacturing, vol. 30, pp. 331-338, Jan. 2019.[9] A. Gisario, M. Kazarian, F. Martina, M. Mehrpouya. “Metal additive manufacturing in the commercial aviation industry: A review.” Journal of Manufacturing Systems, vol. 53, pp. 124-149, Oct. 2019.[10] T.W. Kerekes, H. Lim, W. Y. Joe, G. J. Yun. “Characterization of process-deformation/damage property relationship for fused deposition modelling (FDM) 3D-printed specimens.” Additive Manufacturing vol. 25, pp. 532-544, Dec. 2018[11] K.G. Mostafa, C. Montemagno, A.J. Qureshi. “Strength to cost ratio analysis of FDM Nylon 12 3D Printed Parts.” Procedia Manufacturing, vol. 26, pp. 753-762, 2018.[12] T.D. Ngo, A. Kashani, G. Imbalzano, K.T. Nguyen, D. Hui. “Additive manufacturing (3D printing): A review of materials, methods, applications and challenges.” Composites Part B: Engineering, vol. 43, pp. 172-196, Jun. 2018.[13] D. Prostański. “Dust control with use of air-water spraying system.” Archives of Mining Sciences, vol. 57(4), pp. 975-990, Dec. 2012.[14] Y. Qian et al. “A Review of 3D Printing Technology for Medical Applications.” Engineering, vol. 4(5), pp. 729-742, Oct. 2018.[15] N. Shahrubudin, T.C. Lee, R. Ramlan. “An Overview on 3D Printing Technology: Technological, Materials, and Applications.” Procedia Manufacturing, vol. 35, pp. 1286-1296, 2019.[16] A. Sheoran, H.Kumar. “Fused Deposition modeling process parameters optimization and effect on mechanical properties and part quality: Review and reflection on present research.” Materials Today: Proceedings, vol. 21, pp. 1659-1672. Dec. 2019.[17] M. Siegmund, D. Bałaga, M. Kalita. „Testing the parameters of spraying stream form fine-drops nozzles”. Mining Machines, vol. 3 pp. 3-13, Sep. 2018.[18] S. Singh, S. Ramakrishna, R. Singh. “Material issues in additive manufacturing; a review.” Journal of Manufacturing Processes, vol. 25, pp. 185-200, Dec. 2016.[19] M. Snopczyński, J. Kotliński, I. Musiałek. “Testing of mechanical properties of materials used in FDM technology.” Mechanik, vol. 4, pp. 285-287, Apr. 2019.[20] M. Upadhyay, T. Sivarupan, M.E. Mansori. “3D printing for rapid sand casting – A review.” Journal of Manufacturing Processes, vol. 29, pp. 211-220, Oct. 2017.[21] P. Wang, B. Zou, H. Xiao, S. Ding, C. Huang. “Effects of printing parameters of fused deposition modelling on mechanical properties, surface quality, and microstructure of PEEK.” Journal of Materials Processing Technology, vol. 271, pp. 62-74, Sep. 2019

Search for eV (pseudo)scalar penetrating particles in the SPS neutrino beam

We carried out a model-independent search for light scalar or pseudoscalar particles a's (an example of which is the axion) that couple to two photons by using a photon-regeneration method at high energies allowing a substantial increase in the sensitivity to eV masses.\ The experimental set-up is based on elements of the CERN West Area Neutrino Facility (WANF) beam line and theNOMAD neutrino detector.\ The new particles, if they exist, could be produced through the Primakoff effect in interactions of high energy photons, generated by the 450 GeV protons in the CERN SPS neutrino target, with virtual photons from the WANF horn magnetic field.\ The particles would penetrate the downstream shieldingand would be observed in the NOMAD neutrino detector through their re-conversion into real high energy photons byinteracting with the virtual photons from the magnetic field of the NOMAD dipole magnet.\ From the analysis of the data collected during the 1996 run with 1.08×1019 protons on target, 312 candidate events with energy between 5 and 140 GeV were found.\ This number is in general agreement with the expectation of 272±18 background events from standard neutrino processes.\ A 90 % CL upper limit on the aγγ-coupling gaγγ< 1.5×10−4 GeV−1 for a masses up to 40 eV is obtained

First paleomagnetic results of mid-to late Holocene sediments from Lake Issyk-Kul (Kyrgyzstan): Implications for paleosecular variation in central Asia

We present new paleomagnetic and rock magnetic data from mid and late Holocene sediments recovered in two gravity cores (C087 and C142a) from Lake Issyk-Kul (central Asia), for which independent radiocarbon-based age models are available. Our results indicate that sediments from core C087 are characterized by fine (pseudo single domain) magnetite grains and are reliable recorders of Holocene geomagnetic paleosecular variation (PSV) in central Asia, which is a region with poor data coverage. Similarity is found between the core C087 PSV record, which spans the last 5700 years, and the Lake Baikal PSV record, which is the only published Holocene central Asian PSV record of comparable length with an independent radiocarbon-based chronology. Our new results represent a step forward in constructing a reference PSV curve for central Asia that can be used to date sedimentary sequences. These results can also be used to improve the reliability and accuracy of global geomagnetic field models. We have not been able to disentangle past environmental changes in the Lake Issyk-Kul region based on rock magnetic properties, probably because the magnetite and hematite in the studied sediments have a mixed (fluvial and eolian) terrigenous origin. Copyright 2012 by the American Geophysical Union.Financial support for this research was provided through a CSIC JAE-Doc post-doctoral research contract (MGP), the GRACCIE (Spanish Consolider-Ingenio CSD2007-00067), APELIK (EU ICA2-CT-2000-10003), CGL2008-02203/BTE, and PALEONAO (CGL2010-15767/BTE) research projects.Peer Reviewe