bluuebunny/crossref_metadata_2025 huggingface dataset:
Novel non‐linear demapper for soft decision decoder of LDPC codes in impulsive noise
Authors: Dai Bin , Liu Rongke , Mei Zhen
Published: February 2019

Impulsive noises severely degrade the performance of a communication system. This study deals with the performance of the soft decision decoder for low‐density parity‐check codes over impulsive noise channels. To simplify the calculation of log likelihood ratio (LLR) and cooperate with the soft decision decoder, a new non‐linear approximation named inverse demapper of LLR over the impulsive noise is proposed. Without carrying the noise statistics, the inverse demapper performs close to the optimal demapper. In addition, the density evolution is employed to obtain optimal parameters of the inverse demapper. Then, the extrinsic information transfer chart analysis and simulation results are presented to verify the effectiveness of the authors' proposed demapper.
Time‐varying model for the effective diagnosis of oil‐paper insulation used in power transformers
Authors: Banerjee Chandra Madhab , Dutta Saurabh , Baral Arijit , Chakravorti Sivaji
Published: February 2019

The analysis of dielectric response function obtained from the power transformer is a well‐accepted technique in insulation diagnosis. A convenient way of analysing time‐domain dielectric response φ (t) is the formulation of simple resistance−capacitance‐based circuits like the conventional Debye model (CDM) or the modified Debye model (MDM) that are capable of modelling φ (t). However, available techniques do not guarantee unique branch parameters of such circuits for a given φ (t). In fact, the branch parameters are known to depend on the curve‐fitting procedure opted during model formulation. This makes accuracy of CDM and MDM parameter‐based diagnosis techniques less reliable. Furthermore, it seems logical to analyse the time‐domain dielectric response of oil‐paper insulation using a model containing time‐varying parameters. In this study, a methodology is proposed using which such an insulation model (containing time‐varying parameters) is formulated using time‐domain insulation response. Related analysis presented suggests that the proposed model is immune to problems associated with available insulation models (containing time‐invariant parameters). The performance of the proposed model in indicating insulation condition is tested on data obtained from several real‐life power transformers.
Economic dispatch model for wind power integrated system considering the dispatchability of power to gas
Authors: Chen Zexing , Zhang Yongjun , Ji Tianyao , Li Canbing , Xu Zhiheng , Cai Zexiang
Published: February 2019

Power‐to‐gas (P2G) technology opens up another perspective for effective, long‐term, large‐scale energy storage, so that it can promote large‐scale wind power integration. Under this background, this study introduces P2G technology into the economic dispatch model of wind power integrated systems. First, an uncertainty interval model of wind power is built based on the probability distribution of wind power prediction error. Then, considering P2G's function of absorbing surplus wind power and undertaking downward spinning reserve, the factors that influence P2G's ability in enhancing the accommodation of wind power are analysed through theoretical derivation. Consequently, the relationship between the maximum wind power integration and the power delivered to the P2G facilities under a given capacity of P2G can be further understood. Moreover, an economic dispatch model incorporating wind power, P2G facilities and battery energy storage systems is established and a feasible region relaxation algorithm is proposed to deal with the non‐smooth functions in the proposed model. Case studies are conducted on a modified IEEE 39‐bus system. The results verify the correctness of theoretic analysis and show that the proposed model can help to reduce wind power curtailment and enhance the security and economy of the power system.
Contribution of observed multi frequency spectrum of Alfvén waves to coronal heating
Authors: Pagano P. , De Moortel I.
Published: February 2019

Context. Whilst there are observational indications that transverse magnetohydrodynamic (MHD) waves carry enough energy to maintain the thermal structure of the solar corona, it is not clear whether such energy can be efficiently and effectively converted into heating. Phase-mixing of Alfvén waves is considered a candidate mechanism, as it can develop transverse gradient where magnetic energy can be converted into thermal energy. However, phase-mixing is a process that crucially depends on the amplitude and period of the transverse oscillations, and only recently have we obtained a complete measurement of the power spectrum for transverse oscillations in the corona.

Aims. We aim to investigate the heating generated by phase-mixing of transverse oscillations triggered by buffeting of a coronal loop that follows from the observed coronal power spectrum as well as the impact of these persistent oscillations on the structure of coronal loops.

Methods. We considered a 3D MHD model of an active region coronal loop and we perturbed its footpoints with a 2D horizontal driver that represents a random buffeting motion of the loop footpoints. Our driver was composed of 1000 pulses superimposed to generate the observed power spectrum.

Results. We find that the heating supply from the observed power spectrum in the solar corona through phase-mixing is not sufficient to maintain the million-degree active region solar corona. We also find that the development of Kelvin–Helmholtz instabilities could be a common phenomenon in coronal loops that could affect their apparent life time.

Conclusions. This study concludes that is unlikely that phase-mixing of Alfvén waves resulting from an observed power spectrum of transverse coronal loop oscillations can heat the active region solar corona. However, transverse waves could play an important role in the development of small scale structures.
Observations of solar small-scale magnetic flux-sheet emergence
Authors: Fischer C. E. , Borrero J. M. , Bello González N. , Kaithakkal A. J.
Published: February 2019

Aims. Two types of flux emergence were recently discovered in numerical simulations: magnetic loops and magnetic sheet emergence. While magnetic loop emergence has been documented well in recent years using high-resolution full Stokes data from ground-based telescopes as well as satellites, magnetic sheet emergence is still an understudied process. We report here on the first clear observational evidence of a magnetic sheet emergence and characterise its development.

Methods. Full Stokes spectra from the Hinode spectropolarimeter were inverted with the Stokes Inversion based on Response functions (SIR) code to obtain solar atmospheric parameters such as temperature, line-of-sight velocities, and full magnetic field vector information.

Results. We analyse a magnetic flux emergence event observed in the quiet-Sun internetwork. After a large-scale appearance of linear polarisation, a magnetic sheet with horizontal magnetic flux density of up to 194 Mx cm−2 hovers in the low photosphere spanning a region of 2–3 arcsec. The magnetic field azimuth obtained through Stokes inversions clearly shows an organised structure of transversal magnetic flux density emerging. The granule below the magnetic flux sheet tears the structure apart leaving the emerged flux to form several magnetic loops at the edges of the granule.

Conclusions. A large amount of flux with strong horizontal magnetic fields surfaces through the interplay of buried magnetic flux and convective motions. The magnetic flux emerges within 10 minutes and we find a longitudinal magnetic flux at the foot points of the order of ∼1018 Mx. This is one to two orders of magnitude larger than what has been reported for small-scale magnetic loops. The convective flows feed the newly emerged flux into the pre-existing magnetic population on a granular scale.
Ca line formation in late-type stellar atmospheres
Authors: Osorio Y. , Lind K. , Barklem P. S. , Allende Prieto C. , Zatsarinny O.
Published: February 2019

Context. Departures from local thermodynamic equilibrium (LTE) distort the calcium abundance derived from stellar spectra in various ways, depending on the lines used and the stellar atmospheric parameters. The collection of atomic data adopted in non-LTE (NLTE) calculations must be sufficiently complete and accurate.

Aims. We derive NLTE abundances from high-quality observations and reliable stellar parameters using a model atom built afresh for this work, and check the consistency of our results over a wide wavelength range with transitions of atomic and singly ionised calcium.

Methods. We built and tested Ca I and Ca II model atoms with state-of-the-art radiative and collisional data, and tested their performance deriving the Ca abundance in three benchmark stars: Procyon, the Sun, and Arcturus. We have excellent-quality observations and accurate stellar parameters for these stars. Two methods to derive the LTE/NLTE abundances were used and compared. The LTE/NLTE centre-to-limb variation (CLV) of Ca lines in the Sun was also investigated.

Results. The two methods used give similar results in all three stars. Several discrepancies found in LTE do not appear in our NLTE results; in particular the agreement between abundances in the visual and infra-red (IR) and the Ca I and Ca II ionisation balance is improved overall, although substantial line-to-line scatter remains. The CLV of the calcium lines around 6165 Å can be partially reproduced. We suspect differences between our modelling and CLV results are due to inhomogeneities in the atmosphere that require 3D modelling.
Transverse waves in coronal flux tubes with thick boundaries: The effect of longitudinal flows
Authors: Soler Roberto
Published: February 2019

Observations show that transverse magnetohydrodynamic (MHD) waves and flows are often simultaneously present in magnetic loops of the solar corona. The waves are resonantly damped in the Alfvén continuum because of plasma and/or magnetic field nonuniformity across the loop. The resonant damping is relevant in the context of coronal heating, since it provides a mechanism to cascade energy down to the dissipative scales. It has been theoretically shown that the presence of flow affects the waves propagation and damping, but most of the studies rely on the unjustified assumption that the transverse nonuniformity is confined to a boundary layer much thinner than the radius of the loop. Here we present a semi-analytic technique to explore the effect of flow on resonant MHD waves in coronal flux tubes with thick nonuniform boundaries. We extend a published method, which was originally developed for a static plasma, in order to incorporate the effect of flow. We allowed the flow velocity to continuously vary within the nonuniform boundary from the internal velocity to the external velocity. The analytic part of the method is based on expressing the wave perturbations in the thick nonuniform boundary of the loop as a Frobenius series that contains a singular term accounting for the Alfvén resonance, while the numerical part of the method consists of solving iteratively the transcendental dispersion relation together with the equation for the Alfvén resonance position. As an application of this method, we investigated the impact of flow on the phase velocity and resonant damping length of MHD kink waves. With the present method, we consistently recover results in the thin boundary approximation obtained in previous studies. We have extended those results to the case of thick boundaries. We also explored the error associated with the use of the thin boundary approximation beyond its regime of applicability.
Un âge crétacé inférieur probable pour les paléoaltérations latéritiques du graben de Saint-Maixent-l’École (seuil du Poitou) d’après l’étude isotopique (Rb-Sr, δ18O-δD, U-Th) de pisolites ferrugineux
Authors: Innocent Christophe , Girard Jean-Pierre , Wyns Robert
Published: February 2019

Le début du Crétacé a été marqué en Europe occidentale par le développement de paléoaltérations de type latéritique. Les argiles rouges à cuirasse ferrugineuse pisolitique du graben de Saint-Maixent-l’École (seuil du Poitou) peuvent constituer un exemple-témoin de ce type d’altération. Toutefois, leur âge reste inconnu et leur position stratigraphique, au-dessus des calcaires oligocènes du fond du graben, ne permet pas d’exclure un âge de formation beaucoup plus récent. Des pisolites de goethite provenant de ces sols latéritiques ont été échantillonnés dans la forêt de Fouilloux et ont fait l’objet d’analyses isotopiques Rb-Sr, U-Th et δ18O-δD, afin de tenter de lever l’indétermination sur l’âge de leur formation. Pour Rb-Sr, outre les analyses sur pisolites totaux, des expériences de lessivages ménagés ont été effectuées afin d’essayer d’isoler un composant radiogénique. Les résultats obtenus n’ont pas permis de donner un âge fiable par la méthode des isochrones, même si les données tendraient plutôt à faire remonter l’épisode d’altération au début du Crétacé. Les analyses δ18O-δD ont été effectuées sur des pisolites de goethite totaux, ainsi que sur des fragments sous-échantillonnés. Les résultats plaident en faveur de conditions de formation en zone climatique chaude et/ou aride. Aucun argument en faveur d’un âge fini ou post-oligocène ne peut être tiré de l’étude des isotopes de l’oxygène et de l’hydrogène. Enfin, les analyses U-Th ont été effectuées sur des goethites totales ainsi que sur des fragments sous-échantillonnés. Les rapports d’activités 234U/238U sont tous légèrement supérieurs à l’équilibre séculaire, indiquant que les goethites évoluent actuellement et/ou ont évolué récemment en système ouvert. Ainsi, les sols latéritiques apparaissent toujours comme géochimiquement actifs. Si cette étude n’a pas permis d’apporter une réponse claire sur l’âge des sols latéritiques, l’hypothèse la plus probable au vu des données isotopiques est que ces sols latéritiques se sont développés au-dessus des calcaires kimméridgiens sur les bordures du graben de Saint-Maixent-l’École, puis remaniés et finalement resédimentés au fond du graben.
Application of numerical modelling in stream metrology on the example of primary air installation
Authors: Kabaciński Mirosław , Pospolita Janusz , Polak Janusz , Adamus Piotr , Salij Antoni , Sumara Kazimierz
Published: February 2019

Measurements of stream flows are very common in the power industry. High parameters of the fluid, its impurities or the complexity of the flow installation make often such measurement problematic. Flow disturbances are a factor that significantly increases measurement uncertainty. The paper presents an example the measurement problem solution based on mathematical modelling and digital flow simulation. The problem was the measurement of the air stream in a complex mill air flow installation. A measuring system based on a probe averaging dynamic pressure has been developed. The location of the probe was determined by numerically modelling the flow in the considered section of the mill air installation. Monthly observations of the measuring system operation confirmed its high usefulness in the operation of the mill installation.
Recommendations for the process of biomass and waste gasification in a rotary reactor
Authors: Maj Izabella , Ostrowski Piotr
Published: February 2019

The paper presents a technology for biomass and waste gasification/pyrolysis with use of flue gas as a converting agent. This technology includes a rotary reactor that operates continuously and is integrated with a power boiler, for example WR-25 type grate boiler. Process gas (syngas) as well as possible char being a result of the process are combustible and can be recirculated to the boiler’s combustion chamber. The paper presents laboratory research of selected biomass and waste: Refuse derived fuel (RDF), wood chips, nut shells, sewage sludge, coal sludge, mixture of 50% coal sludge with 50% RDF. Basing on the laboratory research a calculation procedure was developed to determine an industrial-size process parameters. The procedure allows to calculate how much fuel can be gasified/converted in a rotary reactor and the reactor’s dimension: inner diameter Dwr and length Lr.
Potassium and chlorine distributions in high temperature halloysite formed deposits
Authors: Plaza Piotr , Maier Jorg , Maj Izabella , Gądek Waldemar , Kalisz Sylwester
Published: February 2019

The paper presents results of investigations on KCl interaction with halloysite under high temperature conditions. Halloysite is an aluminosilicate that can be used as a fuel additive to prevent chlorine corrosion and formation of low melting corrosive deposits during combustion of biomass. It is claimed that an increase of the emission of gaseous chlorine as HCl(g) and decrease of chlorine share in the ash as result of KCl and halloysite interaction should be expected. During presented tests the mixtures of KCl and halloysite with different ratios were thermally decomposed in a muffle furnace at high temperatures of 900°C and 1100°C. Then, the analyses of potassium and chlorine contents in the formed solid residues were determined. Besides, it has been proved that halloysite addition changes the ash deposit structure as well as increases the ash fusion temperatures. This was supported by performing phase equilibrium calculations for the investigated different halloysite/KCl mixtures. The positive effects of halloysite on potassium capture while reducing chlorine content in solid residue to prevent formation of corrosive deposits have been confirmed.
Exotics at BESIII
Authors: Farinelli Riccardo
Published: February 2019

With a collected integrated luminosity of about 12 fb−1, useful data set for XYZ new resonances, BESIII continues the exploration of these exotic charmonium-like states. In this proceeding, recent results on the measurements of the line-shape of e+e− → π+π−ψ(3868) and π+D0D*−, as well as the JP determination of ZC (3900) will be presented. An abundance of Y will be reported in several decay channels. Finally the present BESIII data above the
${e^ + }{e^ - }\, \to \,{\Lambda _C}{\bar \Lambda _C}$ threshold will be shortly discussed because they are barely in agreement with the current Belle data on the candidate charmed baryonium state Y(4660). A BEPCII upgrade, that will allow to settle this open question, has been funded.
Tetra and pentaquarks from the molecular perspective
Authors: Oset E. , Wang En , Xie J.J. , Geng L.S. , Debastiani V.R. , Dias J. M. , Liang W. H.
Published: February 2019

We present results for the analysis of the B+ → J/ψϕK+ which shows the contribution of two resonances, the X(4140) and X(4160) and a cusp at the $D_s^*\bar D_s^*$ threshold tied to the molecular character of the X(4160) resonance. In the second part we present the results for the theoretical approach to the new Ωcstates from the molecular perspective. In both cases we compare with results of the LHCb collaboration.
Results and prospects for K → πνν̄ at NA62 and KOTO
Authors: Lurkin Nicolas
Published: February 2019

The K → πνν̄ ultra-rare decays are precisely computed in the Standard Model (SM) and are ideal probes for physics beyond the SM. The NA62 experiment at the CERN SPS is designed to measure the charged channel with a precision of 10%. The statistics collected in 2016 allows to reach the SM sensitivity. The KOTO experiment at J-PARC aims at reaching the SM sensitivity before performing a measurement with ∼ 100 signal events. The NA62 preliminary result for the charged channel is presented, together with the current experimental status of the neutral channel and their prospects for the coming years.
Low Energy Antikaon-nucleon/nuclei interaction studies by AMADEUS
Authors: Piscicchia K. , Bazzi M. , Belloti G. , Bragadireanu A. M. , Bosnar D. , Butt A. D. , Cargnelli M. , Curceanu C. , Del Grande R. , De Paolis L. , Fabbietti L. , Fiorini C. , Ghio F. , Guaraldo C. , Hayano R. S. , Iliescu M. , Iwasaki M. , Sandri P. Levi , Marton J. , Miliucci M. , Moskal P. , Okada S. , Ramos A. , Scordo A. , Silarski M. , Sirghi D. L. , Sirghi F. , Skurzok M. , Spallone A. , Doce O. Vazquez , Widmann E. , Wycech S. , Zmeskal J.
Published: February 2019

The AMADEUS experiment at the DAΦNE collider of LNF-INFN deals with the investigation of the at-rest, or low-momentum, K− interactions in light nuclear targets, with the aim to constrain the low energy QCD models in the strangeness sector. The 0 step of the experiment consisted in the reanalysis of the 2004/2005 KLOE data, exploiting K− absorptions in H, 4He, 9Be and 12C, leading to the first invariant mass spectroscopic study with very low momentum (about 100 MeV) in-flight K− captures. With AMADEUS step 1 a dedicated pure Carbon target was implemented in the central region of the KLOE detector, providing a high statistic sample of pure at-rest K− nuclear interaction. The first measurement of the non-resonant transition amplitude $\left| {{A_{{K^ - }n \to \Lambda {\pi ^ - }}}} \right|$ at $\sqrt s = 33\,MeV$ below the K̄N threshold is presented, in relation with the Λ(1405) properties studies. The analysis procedure adopted in the serarch for K− multi-nucleon absorption cross sections and Branching Ratios will be also described.
Pion production in nucleon-nucleon collisions and the issue of dibaryons
Authors: Skorodko T. , Clement H. , Bashkanov M.
Published: February 2019

Pion production in nucleon-nucleon collisions is tightly connected with the issue of dibaryons. After having established the existence of the narrow dibaryon resonance d* (2380) with I(JP) = 0(3+) by two-pion production and elastic proton-neutron scattering experiments, the discussion focuses now on its structure, whether it is a dilute molecular-like or a compact hexaquark object. These scenarios are confronted with experimental branching ratios and other observables. New WASA data for the pp → ppπ+π− reaction give evidence for the existence of an isotensor ΔN threshold state with JP = 1+ as calculated recently by Gal and Garcilazo and predicted earlier by Dyson and Xuong. New ANKE results suggest the dibaryon spectrum to be richer than expected.
Recent results from LEPS and status of LEPS2
Authors: Yosoi Masaru
Published: February 2019

Two high-energy photon beamlines, LEPS and LEPS2, have been operated at SPring-8. In both beamlines, linearly polarized photon beams up to 2.9 GeV produced by laser-induced backward Compton scattering from 8 GeV electrons have been used to study quark-nuclear physics via the photo-production of hadrons. In this article, I present some recent results from LEPS including the coherent ø photoproduction from 4He and γp → π− Δ++ reaction, and report on the current status of the developments of the LEPS2 solenoid spectrometer.
Central exclusive production at LHCb
Authors: McNulty Ronan
Published: February 2019

LHCb has made several measurements of CEP in pp collisions at $\sqrt s $ of 7 and 8 TeV. A new sub-detector consisting of five planes of scintillators was installed in 2015 and extends the pseudorapidity region in which particles can be detected. With the aid of this, measurements of J/ψ and ψ(2S) meson production have been made in pp collisions at $\sqrt s = 13TeV$, leading to an improved experimental precision. A measurement of J/ψ production in lead-lead collisions at $\sqrt {{s_{NN}}} = 13TeV$ is also presented.
Measurement of π0π+/− photoproduction off the deuteron and dbutanol targets
Authors: Ghosal Debdeep
Published: February 2019

Recent experiments using the Crystal Ball/TAPS setup at the MAMI accelerator in Mainz, Germany continue to study the properties and the excitation spectrum of the nucleon with meson photoproduction. Electromagnetic excitations of the proton and neutron are essential for understanding their isospin decomposition. The electromagnetic coupling of photons to protons is different than that of neutrons in certain states. Cross-section data alone is not sufficient for separating resonances, whereas polarization observables play a crucial role being essential in disentangling the contributing resonant and non-resonant amplitudes. Preliminary results of the polarization observable E of double π production off an unpolarized (LD2) and polarized (dButanol) target are shown with comparison to predictions of recent analyses.
Study of baryonic resonances and ρ meson production in the reaction pp → ppπ+π− at 3.5 GeV with HADES
Authors: Belounnas Amel
Published: February 2019

We report on measurements of baryon resonance and ρ meson production in the exclusive pp → ppπ+π− channel at a beam kinetic energy of 3.5 GeV measured with the HADES experimental setup. The differential distributions are compared to Monte Carlo simulations based on a resonance model assuming an incoherent sum of contributions of various baryonic resonances with masses below 2 GeV and using inputs from one pion production measured in the same experiment. A very good description of the two pion production is achieved allowing for an estimate of the contribution of one and double baryon-resonance excitation. Using appropriate kinematical cuts the ρ meson signal could also be extracted.
Meson transition form factor measurements with A2
Authors: Heijkenskjöld L.
Published: February 2019

Meson transition form factors (TFF) describe the electromagnetic structure of mesons and hence provide an important tool for the understanding of the meson-photon interactions. The A2 experiment at MAMI provides a high yield of light mesons produced in photo-induced reactions on protons, which makes the experiment ideal for precision measurements of meson TFFs via studies of meson decays. The A2 collaboration has recently published results of TFFs obtained from measurements of Dalitz decays of the π0 and η mesons as well as the ω → π0e+e− decay. For the study of the η′ Dalitz decay, data has been collected and is being analysed. As a ongoing endeavour, A2 is performing a dedicated measurement of the π0 TFF with statistics increased by several factors compared to the previous A2 result.
Recent dibaryon studies at ANKE
Authors: Tsirkov D. , Komarov V. , Azaryan T. , Dymov S. , Kunsafina A. , Kurbatov V. , Kurmanaliyev Zh. , Uzikov Yu.
Published: February 2019

The recent results of dibaryon studies at ANKE are being presented, along with our plans concerning further studies on the topic. TheD03resonance has been observed at ANKE in the coherentpd→pd+(ππ)0channel, accompanied by the ABC effect. An explanation of the ABC effect has been proposed, suggesting to to explain it as a kinematic cumulation of the pion pairs in theD03→D12+π→d+ (π+π)I=0cascade decay channel due to the predominantly collinearD12decay. Based on this hypothesis, a search for aD21signal in thepp→ {pp}sππreaction is suggested. Thep-wave dibaryon resonances3P2and3P0have been observed at ANKE; for3P0it is a first experimental observation. Preliminary results for a resonance peak in thepp→ {pp}sπ0reaction with the massm= 2646 ± 5 MeV and the widthΓ= 132 ± 14 MeV are being presented. Also we propose to search for the narrowNN*(1535) resonance in thepd→pdηreaction.
Understandingd*(2380) in a chiral quark model
Authors: Huang F. , Dong Y. B. , Shen P. N. , Zhang Z. Y.
Published: February 2019

We review our recent progresses made in the study of the structure and decay properties of the newly observedd*(2380) within a chiral constituent quark model. It is found that thed*(2380) can be explained as a compact hexaquark-dominated exotic state with a fraction of hidden color components of about 2/3 in its configuration. Based on this scenario the single- and double- pionic partial decay widths are calculated and the corresponding numerical results are in good agreement with the experimental data.
Calculations ofη-nuclear quasi-bound states in few-body systems
Authors: Schäfer M. , Barnea N. , Friedman E. , Gal A. , Mareš J.
Published: February 2019

We report on our Stochastic Variational Method (SVM) calculations ofη-nuclear quasi-bound states in s-shell nuclei as well as the very recent calculation of the p-shell nucleus6Li. TheηNpotentials used were constructed fromηNscattering amplitudes obtained within coupled-channel models that incorporateN*(1535) resonance. We found thatη6Li is bound in theηNinteraction models that yield ReaηN≥ 0.67 fm. Additional repulsion caused by the imaginary part ofηNpotentials shifts the onset ofη-nuclear binding toη4He, yielding very likely no quasi-bound state inη3He.
Recent results of the hadronic cross section measurements with the CMD-3 detector at e+e− collider VEPP-2000
Authors: Fedotovich G. V. , Akhmetshin R. R. , Amirkhanov A. N. , Anisenkov A. V. , Banzarov V. S. , Bashtovoy N. S. , Berkaev D. E. , Bondar A. E. , Bragin A. V. , Eidelman S. I. , Epifanov D. A. , Epshteyn L. B. , Erofeev A. L. , Gayazov S. E. , Grebenuk A. A. , Gribanov S. S. , Grigoriev D. N. , Ignatov F. V. , Ivanov V. L. , Karpov S. V. , Kazanin V. F. , Kirpotin A. N. , Koop I. A. , Korobov A. A. , Kozyrev A. N. , Kozyrev E. A. , Krokovny P. P. , Kuzmenko A. E. , Kuzmin A. S. , Logashenko I. B. , Lukin P. A. , Mikhailov K. Yu. , Okhapkin V. S. , OTBOEV A. V. , Peatov Yu. N. , Popov A. S. , Razuvaev G. P. , Ruban A. A. , Ryskulov N. M. , Ryzhenenkov A. E. , Stnchenko A. I. , Shebalin V. E. , Shemyakin D. N. , Shwartz B. A. , Shwartz D. B. , Sibidanov A. L. , Shatunov P. Yu. , Shatunov Yu. M. , Solodov E. P. , Talyshev A. A. , Titov V. M. , Tolmachev S. S. , Vorobiov A. I. , Zemlyansky I. M. , Yudin Yu. V.
Published: February 2019

A brief review of the recent results on the hadronic cross section measurements with the CMD-3 detector at the e+e− collider VEPP-2000 is given. Focus is made on the processes with charged kaons in multihadron events, which have a strong impact on strange meson spectroscopy and form factors that are important ingredients in the Dalitz plot analysis. Experimental data relevant to the topic are presented from the broad energy range covered by VEPP-2000 and compared to earlier measurements by the different collaborations. The analysis is based on the integrated luminosity of about 100 pb−1 collected in 2011, 2012 and 2017.
Production of χc meson pairs with additional emission
Authors: Babiarz I. , Schäfer W. , Szczurek A.
Published: February 2019

We discus mechanism of double χc production with large rapidity separation. The first order pertubative correction to gg→χcχc process includes additional emission of gluon among χc pair. We have considered real gluon distribution as well as virtual correction to the production process of χc pairs. Results for two scalar χc0χc0 and two axial mesons χc1χc1 are shown.
New results on energy and momentum conservation in meson production for A+A collisions at SPS energies
Authors: Rybicki A. , Szczurek A. , Kiełbowicz M. , Mazurek K. , Ozvenchuk V.
Published: February 2019

We review our recent findings on electromagnetic (EM) effects in Ar+Sc and Pb+Pb collisions at CERN SPS energies, and discuss them in the context of our earlier results on the EM splitting of π+/π- meson directed flow. A specific space-time picture emerges, on the basis of which we construct a simple model of the collision. Starting from local energy and momentum conservation, we nicely describe the centrality dependence of π meson rapidity distributions in Pb+Pb collisions at $\rad{}{s_{NN} } = 17.3\,{\rm{GeV}}$. We discuss the resulting implications on the role of energy and momentum conservation for the dynamics of meson production in A+A collisions. We present our conclusions on the link between the initial stages of the nuclear collision and the final state observables connected to strong and electromagnetic phenomena in charged meson emission. We also discuss the possibility to use the latter EM phenomena to obtain new insight into the spectator space-time evolution and excitation energy.
Three-nucleon bound state calculations using the three dimensional formalism
Authors: Topolnicki Kacper , Golak Jacek , Skibiński Roman , Witała Henryk , Volkotrub Yuriy , Soloviov Volodymyr , Grassi Alessandro
Published: February 2019

The traditional method of carrying out few-nucleon calculations is based on the angular momentum decomposition of operators relevant to the calculation. Expressing operators using a finite-sized partial wave basis enables the calculations to be carried out using a small amount of numerical work. Unfortunately, certain calculations that involve higher energies or long range potentials, require including a large number of partial waves in order to get converged results. This is problematic because such an approach requires a numerical implementation of heavily oscillating functions. Modern computers made it possible to carry out few-nucleon calculations without using angular momentum decomposition and instead to work directly with the three dimensional degrees of freedom of the nucleons. In this paper we briefly describe the, so called 3D approach and present preliminary results related to the 3He bound state obtained within this formalism.
Study of the performance of prototypes of straw tube tracker by measuring cosmic rays
Authors: Malige Akshay , Korcyl Grzegorz , Rathod Narendra
Published: February 2019

Straw tube detector developed for the PANDA experiment in [1], will be used for tracking and identifcation of charged particles in the Forward Tracker (FT). The detector read-out will be incorporated in PANDA DAQ running in trigger-less mode by means of Synchronization Of Data Acquisition Network (SODAnet). SODAnet is the protocol used to synchronize individual detector subsystems by providing a common clock signal and timestamps. The reconstruction of events out of many fragments is done with the Burst Building Network. The first tests of such system have been performed with prototypes of FT and ElectroMagnetic Calorimeter modules (EMC) in [1] measuring cosmic rays. Those tests allow to evaluate the detectors as well as the synchronization and processing systems. The reconstruction of particle tracks has been developed and evaluated. The results on the track reconstruction, spatial resolution and energy loss via Time over Threshold (TOT) method is described together with the DAQ performance.
Gaming to Learn astronomy, an innovation approach, two study cases
Authors: Metaxa Margarita
Published: February 2019

In this paper I am going to present you two innovative approaches for learning Astronomy through gaming. On one hand we used the subject of Astronomy as a vehicle since Astronomy provides a unique environment for educators from Kindergarten to Lyceum, and because its multidisciplinary character is ideal for an introduction to science education. On the other hand Gaming to learn has been around for a decade, but it is only recently that these possibilities in the realm of education truly have been appreciated. If indeed humans think immeasurably better as part of a network than on their own, then games are an obvious terrain in which to set minds free and let them wander around. Thus it;s really worthy to test and try this new medium of learning to a fachinating science.
Looking for the sun within the educational core standards: the Spanish case
Authors: Eff-Darwich Antonio , Pallé Pere Ll. , Rosenberg Alfred
Published: February 2019

Although Astronomy is engaging and motivating for both precollege and college students, it is often difficult to fit it in within the formal educational core standards. In this work, we present an analysis of the Spanish educational curricula for primary school to look for opportunities to adapt the tools and the science behind the most famous discoveries about the sun. In this way, we attempt to find opportunities to explain concepts such as: energy, electricity, magnetism, dynamics, astronomy, data analysis, algebra, arithmetics, geometry, language and communication skills, music, cooperative working, computing, the use of new technologies and problem-based learning.
Outcomes from the IYL2015 Quality Lighting Teaching Kit Program: Reaching for the Stars
Authors: Walker Constance , Pompea Stephen
Published: February 2019

Poor quality lighting not only impedes astronomy research and our right to see a starry night sky, but creates safety issues, affects human circadian sensitivities, disrupts ecosystems, and wastes billions of dollars/year in energy consumption. It also leads to excess carbon emissions. How do you change the mindset of society that is used to turning night into day? You educate the next generation on quality lighting. As an outcome of the International Year of Light 2015, the U.S. National Optical Astronomy Observatory’s Education and Public Outreach group has produced a Quality Lighting Teaching (QLT) Kit. The kits are designed around problem-based learning scenarios. The kit’s six activities allow students to address real lighting problems that relate to wildlife, sky glow, aging eyes, energy consumption, safety, and light trespass. The activities are optimized for 11-14 year olds, but can be expanded to younger and older. All materials are in English and Spanish. Most of the activities can be done within in a few minutes during class or afterschool in the form of stations or as stand-alones. Everything one needs for the six activities is included. Tutorial videos on how to do the activities can be found at www.noao.edu/education/qltkit.php. Ninety-two kits have been distributed to 32 countries with the help of SPIE–The International Society for Optical Engineering, CIE–International Commission on Illuminations, OSA–The Optical Society, IDA–the International Dark Sky Association, and the IAU OAD–Office of Astronomy Development. Highlights from the initial program evaluation will be discussed.
Learning Astrobiology 101 with experiments in Baja California, Mexico
Authors: Vázquez Roberto , Núñez Patricia G.
Published: February 2019

We present our experience teaching the subject ‘Astrobiology 101’ (“Introducción a la Astrobiología”, in Spanish), given in the University of Baja California at Ensenada, Mexico, since 2004 up to the present. The place of Astrobiology in Mexico, as well as the local academic context in Baja California are presented, as we consider that the multidisciplinary academic environment plays an important role in the motivation of our students. We describe the course itself, its materials, and resources. The course was designed based on classical books as well as news, academic papers, and internet sources. After seven editions of the course, we have noted that making practical experiments improves the understanding of concepts, ideas, and also strengths the interaction among students with different majors. This course has received support by means of an educational grant which objective is to compile all the experimental and hands-on activities in two manuals: one for students and the other for the teachers These manuals will be available to all the Spanish-speaker teachers who want to teach the full course or part of it, as well as those only interested in the hands-on activities. Locally, the establishment of the new Astrobiology Laboratory, in the Institute of Astronomy (UNAM, Campus Ensenada), surely will help us to increase the opportunities on research and education for our students, as well as visiting students and teachers.
A teaching-learning module on stellar structure and evolution
Authors: Galano Silvia , Colantonio Arturo , Leccia Silvio , Puddu Emanuella , Marzoli Irene , Testa Italo
Published: February 2019

We present a teaching module focused on stellar structure, functioning and evolution. Drawing from literature in astronomy education, we identified three key ideas which are fundamental in understanding stars’ functioning: spectral analysis, mechanical and thermal equilibrium, energy and nuclear reactions. The module is divided into four phases, in which the above key ideas and the physical mechanisms involved in stars’ functioning are gradually introduced. The activities combine previously learned laws in mechanics, thermodynamics, and electromagnetism, in order to get a complete picture of processes occurring in stars. The module was piloted with two intact classes of secondary school students (N = 59 students, 17–18 years old) and its efficacy in addressing students’ misconceptions and wrong ideas was tested using a ten-question multiple choice questionnaire. Results support the effectiveness of the proposed activities. Implications for the teaching of advanced physics topics using stars as a fruitful context are briefly discussed.
Daily life astronomy activity and its contribution to children and educators in science education
Authors: Tomita Akihiko
Published: February 2019

Daily life astronomy activity in nurseries and after school care clubs has many aspects to improve children’s and educator’s scientific views and skills. Though these activities are casual and ordinary ones for many nurseries and after school care clubs, aspects of science education are found in many ways reflecting the activity referring to the UNAWE Evaluation Guide. This indicates that if we intend to promote science education in nurseries and preschools, we do not necessarily have to introduce new activity, but that the formative assessment to pick up science in daily life activities is sufficient. This can encourage educators to be selfconfident in implementing science education. The improvement of selfconfidence is observed in teacher-training students of primary and preschool education during university class when they learned that they already had skills for daily life astronomy education. Thus, daily life astronomy education is not only an interesting and exciting activity for children but it also contributes to improving the educator’s confidence and hence their skills of science education.
Demonstrating the Principles of Aperture Synthesis with Table- Top Laboratory Exercises
Authors: Marr J.M. , Rogers A.E.E. , Fish V.L. , Wilkin F.P. , Arndt M.B. , Holodak G. , Durkota K.
Published: February 2019

Many undergraduate radio astronomy courses are unable to give a detailed treatment of aperture synthesis due to time constraints and limited math backgrounds of students. We have taken a laboratory-based approach to teaching radio interferometry using a set of college-level, table-top exercises. These are performed with the Very Small Radio Telescope (VSRT), an interferometer developed at the Haystack Observatory using satellite TV electronics as detectors and compact fluorescent light bulbs as microwave signal sources. The hands-on experience provided by the VSRT in these labs allows students to gain a conceptual understanding of radio interferometry and aperture synthesis without the rigorous mathematical background traditionally required.

The data are quickly and easily processed using a user-friendly data analysis Java package, VSRTI_Plotter.jar. This software can also be used in the absence of the equipment as an interactive computer activity to demonstrate an interferometer’s responses to assorted surface brightness distributions. The students also gain some familiarity with Fourier transforms and an appreciation for the Fourier relations in interferometry using another Java package, the Tool for Interactive Fourier Transforms (TIFT). We have successfully used these tools in multiple offerings of our radio astronomy course at Union College
A sustainable culture of tardigrades (Hypsibius dujardini) for astrobiological laboratory activities
Authors: Núñez Patricia G. , Quevedo Nayeli G. , Vázquez Roberto
Published: February 2019

Tardigrades are microscopic organisms that have gained importance in astrobiology in recent years. They have extreme survival ability and can enter into a state of latency for several years called cryptobiosis. Due to our interest in conducting experiments with tardigrades to complement the laboratory exercises with students in the course of astrobiology, we bought samples of tardigrades in the cryptobiotic state. A sample of these were cultured at room temperature (18oC) with an oxygenation system, and fed with Spirulina algae every week. We found that in a few weeks tardigrades were producing eggs normally. This species, H. dujardini, has been cultured before and it is a good sample for culture as we saw. This species provides a good sustainable culture and is inexpensive and easy to produce tardigrades for didactic purposes.
Smart Ordering Application for Assigning Sequence Numbers to Customers at Offline Sites
Authors: Chung Myoungbeom
Published: February 2019

In this paper, we propose a new smart ordering application for assigning sequence numbers to customers. This system has advantages over existing ordering systems, for example, it does not require identifying information such as phone numbers or social network IDs, and could therefore protect customer data. In this system, inaudible high frequencies between 18 kHz and 22 kHz are used for communication between speaker and microphone. To evaluate performance, the system was tested across smart devices including the Galaxy S7 and S8, and iPhones 6, 7, and 8, and the results showed a success rate of 98.7%. The proposed system could be a useful service technology for offline sites that need to assign sequence numbers to customers because of high visitor rates.
Optimized Segmentation-Adaptive-Based Testing of the Wavelet Co-movement Analysis: the Case of US and G8 Countries
Authors: Poměnková Jitka , Klejmová Eva , Malach Tobiáš
Published: February 2019

The paper deals with the identification and the description of the co-movement between the US and G8 countries with regard to the impact of the structural change, i.e. the financial crisis in 2008. For the identification of the co-movement, we use an optimized segmentation-adaptive-based approach (SAB) of significance testing of the power wavelet cross-spectrum. The SAB testing is based on the standard testing for the power wavelet cross-spectrum adapted for the case if the data have several levels of volatility during the time evolution, i.e. the data can be split into several segments with different volatility. The number of segments is set by the heteroscedasticity test and the test for comparing variances in the segments of the time series. The SAB testing allows us to identify significant co-movement with respect to the local variance, which can reveal additional significant co-movement areas. We apply this approach to the monthly data of industrial production index for G8 countries in 1993–2017.
Identification of Nonparametric Nonlinear Systems
Authors: Benyassi Mohamed , Brouri Adil
Published: February 2019

Presently, a modelling and identification of nonlinear systems is proposed. This study is developed based on spectral approach. The proposed nonlinear system is nonparametric and can be described by Hammerstein models. These systems consist of nonlinear element followed by a linear block. This latter (the linear subsystem) is not necessarily parametric and the nonlinear function can be nonparametric smooth nonlinearity. This identification problem of Hammerstein models is studied in the presence of possibly infinite-order linear dynamics. The determination of linear and nonlinear block can be done using a unique stage.
Ordinary Petri Net Matrices
Authors: Staines Anthony Spiteri
Published: February 2019

This work presents some ideas and theory on representing ordinary Petri nets using matrices and builds on previous work in [11],[12]. The three main types of matrices used for Petri net representation are the input, output and incidence matrices. The motivation for this work is that matrices can provide an alternative way to describe Petri nets from the conventional graphical representation. As is indicated several properties can be inferred, observed and derived from the matrices. Some definitions and examples are used.