cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Calibration of an SKA-Low Prototype Station Using Holographic Techniques
Creators: name: Thekkeppattu, Jishnu N.
name: Wayth, Randall B.
name: Sokolowski, Marcin
Publisher: name: arXiv
Year: 2024
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Signal Processing (eess.SP)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Performance of digitally beamformed phased arrays relies on accurate calibration of the array by obtaining gains of each antenna in the array. The stations of the Square Kilometer Array-Low (SKA-Low) are such digital arrays, where the station calibration is currently performed using conventional interferometric techniques. An alternative calibration technique similar to holography of dish based telescopes has been suggested in the past. In this paper, we develop a novel mathematical framework for holography employing tensors, which are multi-way data structures. Self-holography using a reference beam formed with the station under test itself and cross-holography using a different station to obtain the reference beam are unified under the same formalism. Besides, the relation between the two apparently distinct holographic approaches in the literature for phased arrays is shown, and we show that under certain conditions the two methods yield the same results. We test the various holographic techniques on an SKA-Low prototype station Aperture Array Verification System 2 (AAVS2) with the Sun as the calibrator. We perform self-holography of AAVS2 and cross-holography with simultaneous observations carried out with another station Engineering Development Array 2. We find the results from the holographic techniques to be consistent among themselves as well as with a more conventional calibration technique.
description: Accepted version
Electronic shell effects and the stability of alkali nanowires
Creators: name: Urban, D. F.
name: Bürki, J.
name: Yanson, A. I.
name: Yanson, I. K.
name: Stafford, C. A.
name: van Ruitenbeek, J. M.
name: Grabert, Hermann
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Experimental conductance histograms for Na nanowires are analyzed in detail and compared to recent theoretical results on the stability of cylindrical and elliptical nanowires, using the free-electron model. We find a one-to-one correspondence between the peaks in the histograms and the most stable nanowire geometries, indicating that several of the commonly observed nanowires have elliptical cross sections.
A Construction of Metabelian Groups
Creators: name: Schmidmeier, Markus
Publisher: name: arXiv
Year: 2004
Subjects: subject: Group Theory (math.GR)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 20D10, 20K27, 16G60

description: In 1934, Garrett Birkhoff has shown that the number of isomorphism classes of finite metabelian groups of order $p^{22}$ tends to infinity with $p$. More precisely, for each prime number $p$ there is a family $(M_λ)_{λ=0,...,p-1}$ of indecomposable and pairwise nonisomorphic metabelian $p$-groups of the given order. In this manuscript we use recent results on the classification of possible embeddings of a subgroup in a finite abelian $p$-group to construct families of indecomposable metabelian groups, indexed by several parameters, which have upper bounds on the exponents of the center and the commutator subgroup.
description: 5 pages; to appear in Archiv der Mathematik
The Gross-Pitaevskii equations and beyond for inhomogeneous condensed bosons
Creators: name: Angilella, G. G. N.
name: Bartalini, S.
name: Cataliotti, F. S.
name: Herrera, I.
name: March, N. H.
name: Pucci, R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A simple derivation of the static Gross-Pitaevskii (GP) equation is given from an energy variational principle. The result is then generalized heuristically to the time-dependent GP form. With this as background, a number of different experimental areas explored very recently are reviewed, in each case contact being established between the measurements and the predictions of the GP equations. The various limitations of these equations as used on dilute inhomogeneous condensed Boson atomic gases are then summarized, reference also being made to the fact that there is no many-body wave function underlying the GP formulation. This then leads into a discussion of a recently proposed integral equation, derived by taking the Bogoliubov-de Gennes equation as starting point. Some limitations of the static GP differential equation are thereby removed, though it is a matter of further study to determine whether a correlated wave function exists as underpinning for the integral equation formulation.
description: To appear in "Trends in Boson Research", edited by A. V. Ling (Nova Science, New York, ISBN 1594545219). Better quality figures available upon request
Stan i perspektywy produkcji rzepaku w Polsce i na Ukrainie w aspekcie produkcji biopaliw transportowych
Creators: name: Izdebski, Waldemar
name: Jakubowski, Zdzisław
name: Skudlarski, Jacek
name: Zając, Stanisław
name: Maznev, Gregory Evteevich
name: Zaika, Svetlana Aleksandrovna
name: Izdebski, Waldemar
name: Jakubowski, Zdzisław
name: Skudlarski, Jacek
name: Zając, Stanisław
name: Maznev, Gregory Evteevich
name: Zaika, Svetlana Aleksandrovna
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: International Relations/Trade
subject: rapeseed
subject: biofuel
subject: Poland
subject: Ukraine
subject: / rzepak
subject: biopaliwa
subject: Polska
subject: Ukraina

description: The following text analyzes the status and prospects for rapeseed production in Poland and Ukraine. On the last ten years either countries – Poland and Ukraine there was an increase in the production of rapeseed. In Poland most of rapeseed is used for domestic consumption, while in Ukraine most of it is exported. Increasing of biofuel production is a huge chance for rapeseed producers in Poland and Ukraine. A major threat to rapeseed production is the decision of the European Parliament on reducing the production of first generation biofuels. / Synopsis. W opracowaniu dokonano analizy stanu i perspektyw produkcji rzepaku w Polsce i na Ukrainie. W ostatnim dziesięcioleciu zarówno w Polsce, jak i na Ukrainie miał miejsce wzrost produkcji rzepaku. W Polsce rzepak jest w większości wykorzystywany na rynku krajowym, zaś Ukraina produkuje go głównie na eksport. Wzrost produkcji biopaliw jest dużą szansą dla producentów rzepaku w Polsce i na Ukrainie. Dużym zagrożeniem dla produkcji rzepaku jest decyzja Parlamentu Europejskiego dotycząca zmniejszenia produkcji biopaliw pierwszej generacji.
Scrambling in Yang-Mills
Creators: name: Koch, Robert de Mello
name: Gandote, Eunice
name: Mahu, Augustine Larweh
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Acting on operators with a bare dimension $Δ\sim N^2$ the dilatation operator of $U(N)$ ${\cal N}=4$ super Yang-Mills theory defines a 2-local Hamiltonian acting on a graph. Degrees of freedom are associated with the vertices of the graph while edges correspond to terms in the Hamiltonian. The graph has $p\sim N$ vertices. Using this Hamiltonian, we study scrambling and equilibration in the large $N$ Yang-Mills theory. We characterize the typical graph and thus the typical Hamiltonian. For the typical graph, the dynamics leads to scrambling in a time consistent with the fast scrambling conjecture. Further, the system exhibits a notion of equilibration with a relaxation time, at weak coupling, given by $t\sim{p\overλ}$ with $λ$ the 't Hooft coupling.
description: v2: Reference added
General N = 1 Supersymmetric Fluxes in Massive Type IIA String Theory
Creators: name: Behrndt, Klaus
name: Cvetic, Mirjam
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study conditions on general fluxes of massive Type IIA supergravity that lead to four-dimensional backgrounds with N = 1 supersymmetry. We derive these conditions in the case of SU(3)- as well as SU(2)-structures. SU(3)-structures imply that the internal space is constrained to be a nearly Kähler manifold with all the turned on fluxes, and the negative cosmological constant proportional to the mass parameter, and the dilaton fixed by the quantized ratio of the three-form and four-form fluxes. We further discuss the implications of such flux vacua with added intersecting D6-branes, leading to the chiral non-Abelian gauge sectors (without orientifold projections). Examples that break SU(3)-structures to SU(2)-ones allow for the internal space conformally flat (up to orbifold and orientifold projections), for which we give an explicit example. These results provide a starting point for further study of the four-dimensional (chiral) N = 1 supersymmetric solutions of massive Type IIA supergravity with D-branes and fluxes, compactified on orientifolds.
description: 37 pages; changed the resulting gauge group on intersecting 6-branes, corrected the explicit example (with conformal flat internal space) as well as minor modifications and add a ref
Additional file 2 of Genetic diversity and phylogenetic relationships of tsetse flies of the palpalis group in Congo Brazzaville based on mitochondrial cox1 gene sequences
Creators: name: Mayoke, Abraham
name: Shadrack M. Muya
name: Bateta, Rosemary
name: Mireji, Paul O.
name: Sylvance O. Okoth
name: Onyoyo, Samuel G.
name: Auma, Joanna E.
name: Ouma, Johnson O.
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 2: Text S1. Morphological characterization key for Glossina of the palpalis group.
Dodge and survive: modeling the predatory nature of dodgeball
Creators: name: Ruth, Perrin E.
name: Restrepo, Juan G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: The analysis of games and sports as complex systems can give insights into the dynamics of human competition, and has been proven useful in soccer, basketball, and other professional sports. In this paper we present a model for dodgeball, a popular sport in US schools, and analyze it using an ordinary differential equation (ODE) compartmental model and stochastic agent-based game simulations. The ODE model reveals a rich landscape with different game dynamics occurring depending on the strategies used by the teams, which can in some cases be mapped to scenarios in competitive species models. Stochastic agent-based game simulations confirm and complement the predictions of the deterministic ODE models. In some scenarios, game victory can be interpreted as a noise-driven escape from the basin of attraction of a stable fixed point, resulting in extremely long games when the number of players is large. Using the ODE and agent-based models, we construct a strategy to increase the probability of winning.
description: Added Acknowledgments
Exact solution of position dependent mass Schroedinger equation by supersymmetric quantum mechanics
Creators: name: Koc, Ramazan
name: Tutunculer, Hayriye
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A supersymmetric technique for the solution of the effective mass Schrö% dinger equation is proposed. Exact solutions of the Schroedinger equation corresponding to a number of potentials are obtained. The potentials are fully isospectral with the original potentials. The conditions for the shape invariance of the potentials are discussed.
Single-charge devices with ultrasmall Nb/AlOx/Nb trilayer Josephson junctions
Creators: name: Dolata, R.
name: Scherer, H.
name: Zorin, A. B.
name: Niemeyer, J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Josephson junction transistors and 50-junction arrays with linear junction dimensions from 200 nm down to 70 nm were fabricated from standard Nb/AlOx/Nb trilayers. The fabrication process includes electron beam lithography, dry etching, anodization, and planarization by chemical-mechanical polishing. The samples were characterized at temperatures down to 25 mK. In general, all junctions are of high quality and their I-U characteristics show low leakage currents and high superconducting energy gap values of 1.35 meV. The characteristics of the transistors and arrays exhibit some features in the subgap area, associated with tunneling of Cooper pairs, quasiparticles and their combinations due to the redistribution of the bias voltage between the junctions. Total island capacitances of the transistor samples ranged from 1.5 fF to 4 fF, depending on the junction sizes. Devices made of junctions with linear dimensions below 100 nm by 100 nm demonstrate a remarkable single-electron behavior in both superconducting and normal state. We also investigated the area dependence of the junction capacitances for transistor and array samples.
description: 19 pages incl. 2 tables and 11 figures
Ocena zaawansowania systemów logistycznych w polskich przedsiębiorstwach produkcji żywności
Creators: name: Jałowiecki, Piotr
name: Jałowiecka, Ewa
name: Jałowiecki, Piotr
name: Jałowiecka, Ewa
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Crop Production/Industries
subject: Food Consumption/Nutrition/Food Safety
subject: Research Methods/ Statistical Methods
subject: food production
subject: logistics advancement
subject: logistic information management
subject: information technologies
subject: / produkcja żywności
subject: zaawansowanie logistyki
subject: zarządzanie informacją logistyczną
subject: technologie informacyjne

description: The paper presents a proposal of the synthetic index used to assess the level of advancement in terms of logistics solutions. Index was built on the basis of data obtained from a survey of 511 Polish enterprises of food processing in 2010-2011. Fundamental descriptive characteristics for index value were determined in all groups of employees and sectors of the surveyed enterprises. Also the existence and strength of relationships between the size of the company and belonging to a particular industry, and the level of advancement of used logistic solutions were examined. It was found a systematic and significant increase in the advancement of logistics with increasing the size of companies. Amongst sectors definitely the most advanced in terms of logistics was the dairy industry, at least whereas bakery sector. / Synopsis. W pracy przedstawiono propozycję wskaźnika syntetycznego służącego do oceny poziomu zaawansowania rozwiązań w zakresie logistyki. Wskaźnik zbudowano w oparciu o dane uzyskane w wyniku przeprowadzenia ankiety wśród 511 polskich przedsiębiorstw przetwórstwa rolno-spożywczego w latach 2010-2011. Wyznaczono podstawowe charakterystyki opisowe wskaźnika we wszystkich grupach wielkości zatrudnienia oraz branżach funkcjonowania badanych przedsiębiorstw. Zbadano również istnienie i siłę zależności pomiędzy wielkością przedsiębiorstwa oraz przynależnością do określonej branży, a poziomem zaawansowania stosowanych rozwiązań logistycznych. Stwierdzono systematyczny i znaczący wzrost zaawansowania logistyki w miarę wzrostu wielkości przedsiębiorstw. Wśród branż zdecydowanie najbardziej zaawansowana pod względem logistyki była branża mleczarska, najmniej natomiast branża piekarska.
Optical guiding in meter-scale plasma waveguides
Creators: name: Miao, B.
name: Feder, L.
name: Shrock, J. E.
name: Goffin, A.
name: Milchberg, H. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: We demonstrate a new highly tunable technique for generating meter-scale low density plasma waveguides. Such guides can enable electron acceleration to tens of GeV in a single stage. Plasma waveguides are imprinted in hydrogen gas by optical field ionization induced by two time-separated Bessel beam pulses: The first pulse, a J_0 beam, generates the core of the waveguide, while the delayed second pulse, here a J_8 or J_16 beam, generates the waveguide cladding. We demonstrate guiding of intense laser pulses over hundreds of Rayleigh lengths with on axis plasma densities as low as N_e0=5x10^16 cm^-3.
Czynniki determinujące spożycie mięsa wołowego na świecie i w Polsce w latach 2000-2012
Creators: name: Konarska, Małgorzata
name: Sakowska, Anna
name: Guzek, Dominika
name: Głąbska, Dominika
name: Wierzbicka, Agnieszka
name: Konarska, Małgorzata
name: Sakowska, Anna
name: Guzek, Dominika
name: Głąbska, Dominika
name: Wierzbicka, Agnieszka
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Consumer/Household Economics
subject: International Relations/Trade
subject: Livestock Production/Industries
subject: quality
subject: consumer
subject: beef
subject: meat consumption
subject: / jakość
subject: konsument
subject: mięso wołowe
subject: spożycie mięsa

description: The aim of the study was to characterize the market in beef and its consumption world and in Poland. Consumption of beef is characterized by a great diversity in different countries. In Uruguay, the consumption of beef is up to 61.3 kg/person while in Poland the consumption of such meat is one of the smallest rate of 1.6 kg/person. One of the factors affecting the change in the structure of meat consumption is to increase the income of the population. In the European Union, the structure of consumption of meat has evolved since the enlargement of the community of the new Member States. One of the factors determining changes in consumer behavior in the food market is their nutritional education. On the global trade in beef is also affected by consumer concerns related to animal diseases, among others, Foot and mouth disease and Bovine Spongiform Encephalopathy. Trade is also affected by the long duration of the production cycle, religions, beliefs and ethical aspects and environmental. / Synopsis. Celem pracy była charakterystyka rynku mięsa wołowego oraz jego spożycia na świecie i w Polsce. Konsumpcja mięsa wołowego charakteryzuje się dużym zróżnicowaniem w poszczególnych krajach. W Urugwaju spożycie mięsa wołowego wynosi aż 61,3 kg/osobę natomiast w Polsce konsumpcja tego rodzaju mięsa jest jedną z najmniejszych i wynosi 1,6 kg/osobę. Jednym z czynników mających wpływ na zmianę struktury spożycia mięsa jest wzrost dochodu ludności. W Unii Europejskiej, struktura spożycia mięsa ulegała zmianom od momentu poszerzenia wspólnoty o nowe państwa członkowskie. Jednym z czynników determinujących zmiany zachowań konsumentów na rynku żywnościowym jest ich edukacja żywieniowa. Na światowy handel mięsem wołowym wpływają także obawy konsumentów związane z chorobami zwierząt między innymi z pryszczycą i gąbczastą encefalopatią bydła oraz inne czynniki takie jak, np.: długi cykl produkcyjny, religia, wierzenia oraz aspekty etyczne i środowiskowe.
Order independent structural alignment of circularly permuted proteins
Creators: name: Binkowski, T. Andrew
name: DasGupta, Bhaskar
name: Liang, Jie
Publisher: name: arXiv
Year: 2004
Subjects: subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences

description: Circular permutation connects the N and C termini of a protein and concurrently cleaves elsewhere in the chain, providing an important mechanism for generating novel protein fold and functions. However, their in genomes is unknown because current detection methods can miss many occurances, mistaking random repeats as circular permutation. Here we develop a method for detecting circularly permuted proteins from structural comparison. Sequence order independent alignment of protein structures can be regarded as a special case of the maximum-weight independent set problem, which is known to be computationally hard. We develop an efficient approximation algorithm by repeatedly solving relaxations of an appropriate intermediate integer programming formulation, we show that the approximation ratio is much better then the theoretical worst case ratio of $r = 1/4$. Circularly permuted proteins reported in literature can be identified rapidly with our method, while they escape the detection by publicly available servers for structural alignment.
description: 5 pages, 3 figures, Accepted by IEEE-EMBS 2004 Conference Proceedings
Chemical freeze-out parameters of net-kaons in heavy-ion collisions
Creators: name: Alba, Paolo
name: Bellwied, Rene
name: Mantovani-Sarti, Valentina
name: Noronha-Hostler, Jacquelyn
name: Parotto, Paolo
name: Portillo-Vazquez, Israel
name: Ratti, Claudia
name: Stafford, Jamie M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study chemical freeze-out parameters for heavy-ion collisions by performing two different thermal analyses. We analyze results from thermal fits for particle yields, as well as, net-charge fluctuations in order to characterize the chemical freeze-out. The Hadron Resonance Gas (HRG) model is employed for both methods. By separating the light hadrons from the strange hadrons in thermal fits, we study the proposed flavor hierarchy. For the net-charge fluctuations, we calculate the mean-over-variance ratio of the net-kaon fluctuations in the HRG model at the five highest energies of the RHIC Beam Energy Scan (BES) for different particle data lists. We compare these results with recent experimental data from the STAR collaboration in order to extract sets of chemical freeze-out parameters for each list. We focused on particle lists which differ largely in the number of resonant states. By doing so, our analysis determines the effect of the amount of resonances included in the HRG model on the freeze-out conditions. Our findings have potential impact on various other models in the field of relativistic heavy-ion collisions.
description: 4 pages, 2 figures, 1 table, contribution to the Quark Matter 2019 proceedings
Privacy-Protection Drone Patrol System based on Face Anonymization
Creators: name: Lee, Harim
name: Kim, Myeung Un
name: Kim, Yeongjun
name: Lyu, Hyeonsu
name: Yang, Hyun Jong
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Cryptography and Security (cs.CR)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The robot market has been growing significantly and is expected to become 1.5 times larger in 2024 than what it was in 2019. Robots have attracted attention of security companies thanks to their mobility. These days, for security robots, unmanned aerial vehicles (UAVs) have quickly emerged by highlighting their advantage: they can even go to any hazardous place that humans cannot access. For UAVs, Drone has been a representative model and has several merits to consist of various sensors such as high-resolution cameras. Therefore, Drone is the most suitable as a mobile surveillance robot. These attractive advantages such as high-resolution cameras and mobility can be a double-edged sword, i.e., privacy infringement. Surveillance drones take videos with high-resolution to fulfill their role, however, those contain a lot of privacy sensitive information. The indiscriminate shooting is a critical issue for those who are very reluctant to be exposed. To tackle the privacy infringement, this work proposes face-anonymizing drone patrol system. In this system, one person's face in a video is transformed into a different face with facial components maintained. To construct our privacy-preserving system, we have adopted the latest generative adversarial networks frameworks and have some modifications on losses of those frameworks. Our face-anonymzing approach is evaluated with various public face-image and video dataset. Moreover, our system is evaluated with a customized drone consisting of a high-resolution camera, a companion computer, and a drone control computer. Finally, we confirm that our system can protect privacy sensitive information with our face-anonymzing algorithm while preserving the performance of robot perception, i.e., simultaneous localization and mapping.
Eksport produktów ogrodniczych oraz ich przetworów do Rosji i jego udział w rosyjskim imporcie w latach 2001-2012
Creators: name: Kraciński, Paweł
name: Kraciński, Paweł
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Crop Production/Industries
subject: International Relations/Trade
subject: horticultural products
subject: export
subject: foreign trade
subject: / produkty ogrodnicze
subject: eksport
subject: handel zagraniczny

description: The purpose of the article was to identify changes and trends in Polish export of horticultural products to Russia. The article presents the results the trade of fresh and preserved horticultural products with the Russian Federation in 2001-2010. We analyzed the size and the structure of Russian import of horticultural products and their preserves. Share of Poland in Russian import was then examined. Export to Russia showed dynamic growing trend. In the analyzed period, structure of the Polish export to Russia has changed. The dominant role was lost to preserves of vegetables, which in 2001-2003 accounted for 56% of the value of export ,in favor of fresh fruit, especially apples. The value of export of apples in 2010-2012 was 40% of total gardening export to Russia. / Synopsis. Celem artykułu było określenie zmian i tendencji w polskim eksporcie produktów ogrodniczych do Rosji. W artykule zaprezentowano wyniki handlu produktami ogrodniczymi świeżymi oraz przetworzonymi z Federacją Rosyjską w latach 2001-2010. Przeanalizowano wielkość oraz strukturę rosyjskiego importu produktów ogrodniczych i ich przetworów. Zbadano udział Polski w rosyjskim przywozie. Eksport do Rosji wykazywał dynamiczną tendencję wzrostową. W badanym okresie zmianie uległa struktura polskiego eksportu ogrodniczego do Rosji. Dominującą role straciły przetwory warzywne, które w latach 2001-2003 stanowiły 56% wartości eksportu na rzecz owoców świeżych, głównie jabłek. Wartość eksportu jabłek w latach 2010-2012 wyniosła 40% wartości całego eksportu ogrodniczego do Rosji.
LA ACUACULTURA MEXICANA: POTENCIALIDAD, RETOS Y ÁREAS DE OPORTUNIDAD
Creators: name: Platas Rosado, Diego E.
name: Vilaboa Arroniz, Julio
name: Platas Rosado, Diego E.
name: Vilaboa Arroniz, Julio
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Aquaculture
subject: Rural business
subject: Primary sector

description: The aquaculture activity is the production of any living organism on the water, and it is a primary sector similar to agriculture and livestock production. It shows the fastest economic grow in the world economy for the last 10 years, including electronics and software. This sector is the key to the fight against hungry, creates jobs and due to demand for inputs encourages the domestic market. Then, it shows a great social impact. The aquaculture can be carry out with different technologies, is profitable and good rural business. México shows material, natural and social characteristics to reach the world leaderships. This paper is to analyze the importance of aquaculture at the world level and potential for México.
Mobile robot localization with GNSS multipath detection using pseudorange residuals
Creators: name: Suzuki, Taro
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper proposes a novel positioning technique suitable for use in mobile robots in urban environments in which large global navigation satellite system (GNSS) positioning errors occur because of multipath signals. During GNSS positioning, the GNSS satellites that are obstructed by buildings emit reflection and diffraction signals, which are called non-line-of-sight (NLOS) multipath signals. These multipath signals cause major positioning errors. The key concept considered in this paper is the estimation of a user's position using the likelihood of the position hypotheses computed from the GNSS pseudoranges, consisting only of LOS signals based on the analysis of the pseudorange residuals. To determine the NLOS GNSS signals from the pseudorange residuals at the user's position, it is necessary to accurately determine the position before the computation of the pseudorange residuals. This problem is solved using a particle filter. We propose a likelihood estimation method using the Mahalanobis distance between the hypotheses of the user's position computed from only the LOS pseudoranges and the particles. To confirm the effectiveness of the proposed technique, a positioning test was performed in a real-world urban environment. The results demonstrated that the proposed method is effective for accurately estimating the user's position in urban canyons.
description: This is an electronic version of an article published in ADVANCED ROBOTICS, 33(12):602-613, 2019. ADVANCED ROBOTICS is available online at: www.tandfonline.com/Article DOI: 10.1080/01691864.2019.1619622
Exactly and Quasi-Exactly Solvable two-mode Bosonic Hamiltonians
Creators: name: Koc, Ramazan
name: Tutunculer, Hayriye
name: Olgar, Eser
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We develop a method to determine the eigenvalues and eigenfunctions of two-boson Hamiltonians include a wide class of quantum optical models. The quantum Hamiltonians have been transformed in the form of the one variable differential equation and the conditions for its solvability have been discussed. Applicability of the method is demonstrated on some simple physical systems.
GENERACIÓN DE UN MODELO PARA LA DETERMINACIÓN DE COSTOS DE EMPRESAS PRODUCTORAS DE MIEL EN EL ESTADO DE NAYARIT
Creators: name: Ulloa Castañeda, Ricardo Rafael
name: Anzaldo Velázquez, José Ernesto
name: Martínez Virgen, Maricela
name: Martínez González, Sergio
name: Loya Olguín, José Lenin
name: Ulloa Castañeda, Ricardo Rafael
name: Anzaldo Velázquez, José Ernesto
name: Martínez Virgen, Maricela
name: Martínez González, Sergio
name: Loya Olguín, José Lenin
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Beekeeping Nayarit
subject: Cost analysis
subject: Production efficiency

description: Nayarit possesses a high productive potential in respect to beekeeping, with vast suitable areas suitable for honey and polleniferous plants, a large number of crops grown in the state require the presence of the insect for pollination and production improvement, over a large amount of mangroves, forests and jungles that depend on this bug for their preservation, due to this potential Nayarit beekeepers produce excellent honey which has even been exported to Europe and other countries. So, why there isn’t more and better production? Mainly for three things: the growth has been nil, a poor marketing and bad environmental conditions that have reduced production drastically. The present paper aims to provide a tool for defining the productive efficiency; therefore cost records necessarily must be applied and their analyzed. Elements that help to define the power to compete. Finally, it is intended also to be a simple instrument for the beekeepers; for which consultation, design and develop meetinigs where held to test the model. esults obtained demonstrate that the model can be used by producers for its simplicity and utility. However it is necessary to conduct more test.
BOOKS AND CAFFEINE: EXPLORING COLLEGE STUDENTS' PERCEPTION OF LIBRARY CAFE
Creators: name: Comidoy, Ric Glenn
name: Rosit, Raina Pearl
name: Eba, Eanna Janine
name: Casono, Hazel Rose
Publisher: name: Zenodo
Year: 2025

description: This qualitative research aimed to explore the perceptions and opinions of college students at UM Peñaplata College regarding library cafés and their potential influence on students' views about libraries. The goal was to develop a comprehensive understanding of the students' perspective on library cafés and their role in promoting reading habits and engagement with books. Using a qualitative approach, the study employed a combination of an Interview Guide Questionnaire (IGQ), in-depth interviews of participants. Thematic analysis is used for data analysis to capture the salient themes of the responses of participants. Results revealed that college students perceive library cafés as conducive environments for concentration, productivity, and studying, while also providing a pleasant atmosphere. Students expressed a strong desire for a library café in Samal City, as it offers a unique combination of intellectual engagement, social interaction, and food options. The availability of food enhances the overall studying experience and fosters a sense of community among students. It was also revealed that there are several challenges associated with establishing a library café in Samal City, including logistics, cost management, sustainability, and effective marketing. However, locating the café near the beach in Samal District would be considered as a favorable option, as it would attract both residents and tourists, thereby positively impacting the city's economy and culture. This study provides implication for future research to explore similar businesses, such as library cafés, to support literacy and knowledge.
Strategic marine ecosystem restoration in northern British Columbia
Creators: name: Ainsworth, Cameron H.
Publisher: name: University of British Columbia
Year: 2010

description: Innovative methodology is developed for Back to the Future (BTF) restoration policy analysis to aid long-term strategic planning of ecosystem-based restoration in marine ecosystems. Mass-balance and dynamic ecosystem simulation models (Ecopath with Ecosim: EwE) are developed to represent the marine system of northern British Columbia as it appeared in 1750, 1900, 1950 and 2000 AD. Time series statistics are assembled for biomass and catch, incorporating local ecological knowledge (LEK) from community interviews and new estimates of illegal, unreported and unregulated (IUU) fishery catch. The dynamic behaviour of the historic models is fitted to agree with this time series information, when driven by historic catch rates and climate anomalies. Each historic period is evaluated in an optimal policy analysis for its potential to supply sustainable harvest benefits. Harvest benefits are quantified using socioeconomic and ecological indicators, including novel measures such as the Q-90 biodiversity statistic. Candidate goals for restoration are drafted based on these historic ecosystems. A new conceptual goal for ecosystem-based restoration is introduced, the optimal restorable biomass (ORB) that represents an optimized form of the historic ecosystems. It is structured to maximize sustainable harvest benefits, and to achieve a compromise between exploitation and the maintenance of historic abundance and biodiversity. Finally, restoration plans are drafted using a novel addition to Ecosim’s policy search routine, the specific biomass objective function, which determines the pattern of fishing effort required to restore the depleted present-day ecosystem into one resembling a more productive ORB state. Cost-benefit analysis indicates that northern BC ecosystem restoration to an ORB state based on the 1950 ecosystem can deliver a rate of economic return, in terms of increased fisheries yields, that is superior to bank interest. The effect of fleet structure is paramount; reducing bycatch will greatly enhance the effectiveness of the fleet as a restoration tool. Restoration plans that sacrifice immediate fisheries profits tend to restore more biodiversity in a given amount of time, but a convex relationship between profit and biodiversity suggests there is an optimal rate of restoration.
Monitoring of transiting exoplanets and their host stars with small aperture telescopes
Creators: name: Salisbury, M. A.
name: Kolb, U. C.
name: Norton, A. J.
name: Haswell, C. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Exoplanet research is now target rich with a wide diversity of systems making it difficult for high demand observatories to undertake follow up observations over extended periods of time. We investigate the effectiveness of using 0.4m-class telescopes for monitoring transiting hot Jupiters and their host stars. We consider two representative case studies: WASP-52b with 13 new transits, and HAT-P-23b with 17 new transits and concurrent photometric monitoring covering 78 days. We present updated system parameters and combine our new transit times with previously published results to calculate new ephemerides for both systems. Our analysis of transit mid-times for WASP-52b results in a slight preference for a quadratic ephemeris ($Δχ_ν^2 = 0.07$, $ΔBIC = 1.53$ over a linear ephemeris. We discuss the reality of this quadratic ephemeris indicating a period change of $ δP / δt = -38.6\pm4{\rm ms~yr^{-1}}$ and consider possible causes. WASP-52 is known to be an active star with previous publications reporting many spot crossing events, however no such events are seen in our new photometry. Our analysis shows that WASP-52 is still active and that the latitude of the spots has likely migrated away from the transit chord. We confirm the inflated nature and circular orbit for HAT-P-23b. Our monitoring of HAT-P-23 reveals a periodicity of 7.015 days with an amplitude of 0.011 mag which we interpret as the rotation period of HAT-P-23. The photometric and transit timing precision achieved in the case studies shows that this class of telescope is capable of precise characterisation and long-term monitoring of transiting hot Jupiters in support of dedicated ongoing and future ground and space based observations.
description: 15 pages, 9 figures, accepted for publication in New Astronomy Updated to correct typographical error on line 1 of introduction
Three-dimensional Continuum Radiative Transfer Images of a Molecular Cloud Core Evolution
Creators: name: Steinacker, J.
name: Lang, B.
name: Burkert, A.
name: Bacmann, A.
name: Henning, Th.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze a three-dimensional smoothed particle hydrodynamics simulation of an evolving and later collapsing pre-stellar core. Using a three-dimensional continuum radiative transfer program, we generate images at 7 micron, 15 micron, 175 micron, and 1.3 mm for different evolutionary times and viewing angles. We discuss the observability of the properties of pre-stellar cores for the different wavelengths. For examples of non-symmetric fragments, it is shown that, misleadingly, the density profiles derived from a one-dimensional analysis of the corresponding images are consistent with one-dimensional core evolution models. We conclude that one-dimensional modeling based on column density interpretation of images does not produce reliable structural information and that multidimensional modeling is required.
description: accepted by ApJL, 4 pages, 4 figures
POTENCIAL DE LA JAMAICA (HIBISCUS SABDARIFFA L.) EN LA ELABORACIÓN DE ALIMENTOS FUNCIONALES CON ACTIVIDAD ANTIOXIDANTE
Creators: name: Sumaya Martínez, Ma. Teresa
name: Medina Carrillo, Raquel E.
name: Machuca Sánchez, Ma. Luisa
name: Jiménez Ruiz, Edgar
name: Balois Morales, Rosendo
name: Sánchez Herrera, Leticia Mónica
name: Sumaya Martínez, Ma. Teresa
name: Medina Carrillo, Raquel E.
name: Machuca Sánchez, Ma. Luisa
name: Jiménez Ruiz, Edgar
name: Balois Morales, Rosendo
name: Sánchez Herrera, Leticia Mónica
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Jamaica
subject: Functional foods
subject: Antioxidant activity

description: In Mexico, roselle is a crop with low industrialization. A strategy to raise its competitiveness is the incorporation of a value chain, that involves to have present the demands of the consumers for the fruits commercialization strategies development. Nutritional and functional properties can add value to a food. Roselle is a source of bioactive compounds such as polyphenols, flavonoids, ascorbic acid, among many others; which gives its antioxidant activity and others beneficial effects on health. These compounds can be recovered as part of functional foods with high added value.
Extended Main Sequences in Star Clusters
Creators: name: Li, Chengyuan
name: Milone, Antonino P.
name: Sun, Weijia
name: de Grijs, Richard
Publisher: name: arXiv
Year: 2024
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Extended main sequences (eMSs) and extended main-sequence turnoffs (eMSTOs) are fascinating phenomena that are routinely observed in star clusters. These phenomena strongly challenge the current canonical "simple stellar population" picture of star clusters, which postulates that star clusters are coeval and chemically homogeneous and can thus be described by a single, unique isochrone. Detections of eMSs and eMSTOs provide valuable insights into stellar physics and the evolution of star clusters. This comprehensive review delves into the observational characteristics, underlying mechanisms, and astrophysical implications of the eMSs and eMSTOs observed in young (less than 600 million years) and intermediate-age (600 to 2000 million years) star clusters. Several scenarios or hypotheses have been proposed to explain these phenomena, including the presence of an age spread, binary interactions, variable stars, and differences in stellar rotation rates. This review discusses the advantages and limitations of current models. Among contemporary models and hypotheses, stellar rotation has been demonstrated as the most plausible mechanism to explain the occurrence of eMSs and eMSTOs. Research on stellar rotation and its connection to eMSs has opened up a myriad of fascinating avenues, such as investigations of the magnetic braking mechanism in stars, searches for tidally locked binary systems in star clusters, and investigations as to whether binary mergers can give rise to massive magnetars. These endeavors have yielded valuable insights and significantly enriched our understanding of stellar astrophysics.
description: 37 pages, 7 figures. Fundamental Research (invited review)
Terahertz field induced near-cutoff even-order harmonics in femtosecond laser
Creators: name: Li, Bing-Yu
name: Zhang, Yizhu
name: Yan, Tian-Min
name: Jiang, Y. H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: High-order harmonic generation by femtosecond laser pulse in the presence of a moderately strong terahertz (THz) field is studied under the strong field approximation, showing a simple proportionality of near-cutoff even-order harmonic (NCEH) amplitude to the THz electric field. The formation of the THz induced-NCEHs is analytically shown for both continuous wave and Gaussian pulse. The perturbation analysis with regard to the frequency ratio of the THz field to the femtosecond pulse shows the THz-induced NCEHs originates from its first-order correction, and the available parametric conditions for the phenomenon is also clarified. As the complete characterization of the time-domain waveform of broadband THz field is essential for a wide variety of applications, the work provides an alternative time-resolved field-detection technique, allowing for a robust broadband characterization of pulses in THz spectral range.
Additional file 1 of Genetic diversity and phylogenetic relationships of tsetse flies of the palpalis group in Congo Brazzaville based on mitochondrial cox1 gene sequences
Creators: name: Mayoke, Abraham
name: Shadrack M. Muya
name: Bateta, Rosemary
name: Mireji, Paul O.
name: Sylvance O. Okoth
name: Onyoyo, Samuel G.
name: Auma, Joanna E.
name: Ouma, Johnson O.
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1: Table S1. Summary of entomological data and the mean number of flies per trap per day (FTD), showing absolute number of flies, using the equation FTD = ΣF/T × D.
Impact of temporal correlations on high risk outbreaks of independent and cooperative SIR dynamics
Creators: name: Sajjadi, Sina
name: Ejtehadi, Mohammad Reza
name: Ghanbarnejad, Fakhteh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We first propose a quantitative approach to detect high risk outbreaks of independent and coinfective SIR dynamics on three empirical networks: a school, a conference and a hospital contact network. This measurement is based on the k-means clustering method and identifies proper samples for calculating the mean outbreak size and the outbreak probability. Then we systematically study the impact of different temporal correlations on high risk outbreaks over the original and differently shuffled counterparts of each network. We observe that, on the one hand, in the coinfection process, randomization of the sequence of the events increases the mean outbreak size of high risk cases. On the other hand, these correlations don't have a consistent effect on the independent infection dynamics, and can either decrease or increase this mean. While randomization of the daily pattern correlations has no significant effect on the size of outbreak in either of the coinfection or independent spreading cases. We also observer that an increase in the mean outbreak size doesn't always coincide with an increase in the outbreak probability; therefore we argue that merely considering the mean outbreak size of all realizations may lead us into misestimating the outbreak risks. Our results suggest that some sort of randomizing contacts in organization level of schools, events or hospitals might help to suppress the spreading dynamics while the risk of an outbreak is high.
description: 16 pages, 12 figures
VENTAJAS COMPARATIVAS EN LA GESTIÓN DEL DESEMPEÑO DE LOS AGRONEGOCIOS
Creators: name: Ristori Cueto, David
name: León Ayala, Alma Leslie
name: García Sampedro, Susana Patricia
name: Barroso Yoshikawa, Enrique Yasusi
name: Ristori Cueto, David
name: León Ayala, Alma Leslie
name: García Sampedro, Susana Patricia
name: Barroso Yoshikawa, Enrique Yasusi
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Agribusiness
subject: Performance
subject: Management
subject: Comparative Advantages
subject: Powers

description: The faculty "Organizations Management Zones for Economic Development Under Market Incorporation Globalized" analyzed through a retrospective exercise using as a methodological tool the Logical Framework mesh to establish consistency in the phenomenon to be analyzed in order to clarify the study object, which in this case, highlights the Organizational Performance. As a result of the above it was established that deals with what is investigated in two ways: The first is to describe how reality is presented in exploiting the competitive advantages in the performance of Agribusiness, taking into account the theoretical dimensions (Abstract) process, process evaluation and development of indicators and turn them against the empirical dimensions (Concrete) of information technology and communications, quality standards, training and tax issues and the Second categorize the problems presented in Agribusiness describing somehow the reality they live.