1,987 research outputs found
MCP-PMT development for Belle-II TOP counter
No full textAbstractWe have developed a multiple-anode square-shape MCP-PMT for the Belle-II Time-Of-Propagation (TOP) counter. This detector is a hybrid cherenkov ring imaging and timing detector for particle identification in the barrel region of the upgraded detector. The Belle-II experiment will operate at high event rates and needs to withstand the correspondingly high background environment. MCP-PMT's have demonstrated excellent single photon timing resolution. However, the lifetime of photocathode is a known issue. Recently, we successfully improved the lifetime of a square-shape MCP-PMT by a factor of about 10, which is adequate for estimates of the nominal Belle-II background rates in the TOP counter. We have also developed a new MCP-PMT with Hamamatsu photonics, that adopts a super bialkali photocathode. Currently a peak quantum effciency of 28% for 400nm photons has been achieved
Evolution des flux de travailleurs frontaliers en Belgique, de 1972 à 1982 [Un essai d'utilisation des statistiques annuelles établies par l'Institut National d'Assurance Maladie-Invalidité (INAMI) ]
No full textEvolution of the movements of Belgian workers who live near the frontier from 1972 to 1982. An attempt to use the yearly statistics of the National Institute for Health and disablement insurance (INAMI).
Abstract : The author offers a summary of the recent evolution (1972-1982) of the movements of the Belgian workers who live near the border in perusing the yearly I. N. A. M.I. statistics. Beyond the preliminary quantitative study of the movements of the active population at the various frontiers of the Belgian Kingdom, R.S. wants to show the demographic profile of this very particular population. A study based on the scale of the Belgian « arrondissement » well localizes the frontier movements.L'auteur propose un bilan de l'évolution récente (1972-1982) des flux de travailleurs frontaliers en Belgique dépouillant les statistiques annuelles de l' INAMI. Au-delà de l'approche quantitative préalable des navettes de population active aux différentes frontières du royaume, R. SEVRIN veut présenter le profil démographique de cette population très particulière. Une étude, menée à l'échelle de l'arrondissement belge, permet de bien localiser les mouvements frontaliers.Sevrin Robert. Evolution des flux de travailleurs frontaliers en Belgique, de 1972 à 1982 [Un essai d'utilisation des statistiques annuelles établies par l'Institut National d'Assurance Maladie-Invalidité (INAMI) ]. In: Espace, populations, sociétés, 1984-1. Limites et frontières. pp. 65-81
Rhodium-Catalyzed Isoquinoline Synthesis Using Vinyl Selenone as Oxidizing Acetylene Surrogate
No full textInami A., Nishii Y., Hirano K., et al. Rhodium-Catalyzed Isoquinoline Synthesis Using Vinyl Selenone as Oxidizing Acetylene Surrogate. Organic Letters 25, 3206 (2023); https://doi.org/10.1021/acs.orglett.3c00826.Isoquinoline is a privileged structure in many bioactive compounds and valuable ligands. Transition-metal-catalyzed oxidative annulation of imine derivatives has become a promising synthetic method; however, catalytic synthesis of 3,4-nonsubstituted isoquinolines by formal acetylene annulation has been scarce to date. Herein, we introduce vinyl selenone as an effective acetylene surrogate for the Rh-catalyzed annulative coupling under mild conditions. The Se fragment can be recovered as diselenide and recycled. The product can readily be converted to 1-aminoisoquinolines
Search for , and Decays
No full textWe report a search for the decays and . We also measure other charmless decay modes with and final states. The results are obtained from a data sample containing pairs collected with the Belle detector at the KEKB asymmetric-energy collider. We set upper limits on the branching fractions for B^0\to K^{*0} \kstarbar and of and , respectively, at the 90% confidence level
Measurement of CP violating asymmetries in B^0 -> K^+K^- K^0_S decays with a time-dependent Dalitz approach
No full textWe report a measurement of violating asymmetries in decays with a time-dependent Dalitz approach. This analysis is based on a data sample of pairs accumulated at the resonance with the Belle detector at the KEKB asymmetric-energy collider. As the result of an unbinned maximum likelihood fit to the selected candidates, the mixing-induced and direct violation parameters, and are obtained for , and other decays. We find four solutions that describe the data. There are \{eqnarray*} \phi_1^{\rm eff}(B^0\to \phi(1020) K^0_S) & = & (32.2 \pm 9.0 \pm 2.6 \pm 1.4)^{\circ}; \phi_1^{\rm eff}(B^0\to \phi(1020) K^0_S) & = & (26.2 \pm 8.8 \pm 2.7 \pm 1.2)^{\circ};\\ \phi_1^{\rm eff}(B^0\to \phi(1020) K^0_S) & = & (27.3 \pm 8.6 \pm 2.8 \pm 1.3)^{\circ}\; {\rm and}\\ \phi_1^{\rm eff}(B^0\to \phi(1020) K^0_S) & = & (24.3 \pm 8.0 \pm 2.9 \pm 5.2)^{\circ}.{eqnarray*}\ The values for the violating phase in are similar but other properties of the Dalitz plot are quite different for the four solutions. These four solutions have consistent values for all three meson decay channels and none of them deviates significantly from the values measured in decays with the currently available statistics. In addition, we find no significant direct violation
Etude comparée de trois échelles d'évaluation de la dépendance des personnes âgées en Belgique
No full textBackground & Objectives: In Belgium two scales are used to assess disability and dependence of elderly persons (INAMI scale and APA scale). In France, dependence is assessed by the "Autonomie Gerontologie Groupes Isoressources" (AGGIR) scale. However, none of these tools has been validated according to metrological standards. This article presents the data of four surveys conducted in order to compare validity of the three scales. Methods: Content validity was assessed using ICF as reference, by experts' consensus. Concurrent validity between the scales was evaluated using ordinal and linear regressions ;the ability of the scales to distinguish different nursing home populations was evaluated using chi square test and means comparisons (Mann-Whitney U); concomitant validity with nursing care load was tested using categorical and linear regressions; discriminant validity using one way variance analysis. Reliability was analyzed using Cronbach's α, ICC, Cohen's k and Kruskal and Goodman's γ coefficients. Results: Content validity: INAMI scale is ICF-related and measures needs for care; APA scale is ICF related and measures incapacities; AGGIR is ICF-related and measures performance in the activities in daily living. Concurrent validity shows Pearson's R 2 and Kendall's tau-b values >0,6; capacity of the scales to distinguish different populations shows significant chi square tests (p0,6; analysis of discriminant validity sho ws that all categories of INAMI and APA scales are not significantly different. However, this is not the case for those of AGGIR scale. Reliability analysis shows all Cronbach's α>0,8; all CCI>0,7; k >0,6 for INAMI scale and AGGIR and >0,5 for APA; γ>0,8. Conclusion: Both INAMI and AGGIR scales are valid however INAMI scale is less discriminant. APA scale is not valid enough to measure dependence.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Search for violation in decays and observation of the Cabibbo-suppressed decay
No full textWe search for violation by measuring a -odd asymmetry in the
Cabibbo-suppressed decay, and
in the Cabibbo-favored and
decays. We use 980 of data collected by the Belle detector running at the KEKB
asymmetric-energy collider. The -violating -odd parameter
is measured to be
and
where the first
uncertainty is statistical and the second is systematic. We also report the
first observation of the Cabibbo-suppressed decay . The branching fraction is measured relative to
that of the analogous Cabibbo-favored decay :
Measurement of the branching fractions for Cabibbo-suppressed decays D+→K+K−π+π0 and D(s)+→K+π−π+π0 at Belle
No full textWe present measurements of the branching fractions for the singly Cabibbo-suppressed decays D+→K+K−π+π0 and D+s→K+π−π+π0, and the doubly Cabibbo-suppressed decay D+→K+π−π+π0, based on 980 fb−1 of data recorded by the Belle experiment at the KEKB e+e− collider. We measure these modes relative to the Cabibbo-favored modes D+→K−π+π+π0 and D+s→K+K−π+π0. Our results for the ratios of branching fractions are B(D+→K+K−π+π0)/B(D+→K−π+π+π0)=(11.32±0.13±0.26)%, B(D+→K+π−π+π0)/B(D+→K−π+π+π0)=(1.68±0.11±0.03)%, and B(D+s→K+π−π+π0)/B(D+s→K+K−π+π0)=(17.13±0.62±0.51)%, where the uncertainties are statistical and systematic, respectively. The second value corresponds to (5.83±0.42)×tan4θC, where θC is the Cabibbo angle; this value is larger than other measured ratios of branching fractions for a doubly Cabibbo-suppressed charm decay to a Cabibbo-favored decay. Multiplying these results by world average values for B(D+→K−π+π+π0) and B(D+s→K+K−π+π0) yields B(D+→K+K−π+π0)=(7.08±0.08±0.16±0.20)×10^−3, B(D+→K+π−π+π0)=(1.05±0.07±0.02±0.03)×10^−3, and B(D+s→K+π−π+π0)=(9.44±0.34±0.28±0.32)×10^−3, where the third uncertainty is due to the branching fraction of the normalization mode. The first two results are consistent with, but more precise than, the current world averages. The last result is the first measurement of this branching fraction
- …
