Dirac spinor fields in the teleparallel gravity: comment on "Metric-affine approach to teleparallel gravity"

We show that the coupling of a Dirac spinor field with the gravitational field in the teleparallel equivalent of general relativity is consistent. For an arbitrary SO(3,1) connection there are two possibilities for the coupling of the spinor field with the gravitational field. The problems of consistency raised by Y. N. Obukhov and J. G. Pereira in the paper {\it Metric-affine approach to teleparallel gravity} [gr-qc/0212080] take place only in the framework of one particular coupling. By adopting an alternative coupling the consistency problem disappears.Comment: 8 pages, Latex file, no figures, to appear in the Phys. Rev. D as a Commen

CCM.G-K2 key comparison

open55sìIn November 2013 an International Key Comparison, CCM.G-K2, was organized in the Underground Laboratory for Geodynamics in Walferdange. The comparison has assembled 25 participants coming from 19 countries and four different continents. The comparison was divided into two parts: the key comparison that included 10 NMIs or DIs, and the pilot study including all participants. The global result given by the pilot study confirms that all instruments are absolutely coherent to each other. The results obtained for the key comparison confirm a good agreement between the NMI instrumentsopenO. Francis; H. Baumann; C. Ullrich; S. Castelein; M. Van Camp; M. Andrade de Sousa; R. Lima Melhorato; C. Li; J. Xu; D. Su; S. Wu; H. Hu; K. Wu; G. Li; Z. Li; W. Hsieh; V. Pálinkás; J. Kostelecký; J. Mäkinen; J. Näränen; S. Merlet; F. Pereira Dos Santos; P. Gillot; J. Hinderer; J. D. Bernard; N. Le Moigne; B. Fores; O. Gitlein; M. Schilling; R. Falk; H. Wilmes; Germak A.; E. Biolcati; C. Origlia; D. Iacovone; F. Baccaro; S. Mizushima; R. De Plaen; G. Klein; M. Seil; R. Radinovic; M. Sekowski; P. Dykowski; I. M. Choi; M. S. Kim; A. Borreguero; S. Sainz-Maza; M. Calvo; A. Engfeldt; J. Agren; R. Reudink; M. Eckl; D. van Westrum; R. Billson; B. EllisFrancis, O.; Baumann, H.; Ullrich, C.; Castelein, S.; Van Camp, M.; Andrade de Sousa, M.; Lima Melhorato, R.; Li, C.; Xu, J.; Su, D.; Wu, S.; Hu, H.; Wu, K.; Li, G.; Li, Z.; Hsieh, W.; Pálinkás, V.; Kostelecký, J.; Mäkinen, J.; Näränen, J.; Merlet, S.; Pereira Dos Santos, F.; Gillot, P.; Hinderer, J.; Bernard, J. D.; Le Moigne, N.; Fores, B.; Gitlein, O.; Schilling, M.; Falk, R.; Wilmes, H.; Germak, ALESSANDRO FRANCO LIDIA; Biolcati, E.; Origlia, C.; Iacovone, D.; Baccaro, F.; Mizushima, S.; De Plaen, R.; Klein, G.; Seil, M.; Radinovic, R.; Sekowski, M.; Dykowski, P.; Choi, I. M.; Kim, M. S.; Borreguero, A.; Sainz Maza, S.; Calvo, M.; Engfeldt, A.; Agren, J.; Reudink, R.; Eckl, M.; van Westrum, D.; Billson, R.; Ellis, B

Water Saving in the Yellow River Basin, China. 1. Irrigation Demand Scheduling

Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a Technical Paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 5 (2003): A. Campos, L. Pereira, J. Gonclaves, M. Fabiao, Y. Liu, Y. Li, Z. Mao, and B. Dong. Water Saving in the Yellow River Basin, China. 1. Irrigation Demand Scheduling. Vol. V. July 2003

Water Saving in the Yellow River Basin, China. 2. Assessing the Potential for Improving Basin Irrigation

Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a Technical Paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 5 (2003): M. Fabiao, J. Gonclaves, L. Pereira, A. Campos, Y. Liu, Y. Li, Z. Mao, and B. Dong. Water Saving in the Yellow River Basin, China. 2. Assessing the Potential for Improving Basin Irrigation. Vol. V. July 2003

Hydrogen peroxide release kinetics of four tooth whitening products—in vitro study

none8siTooth whitening efficacy can be influenced by several factors, of which concentration and application time are two of the most important. This in vitro study aimed to evaluate the initial content and release kinetics of the hydrogen peroxide (HP) content, or the carbamide peroxide (CP) content as converted to its HP equivalent, of four tooth whitening products with different concentrations (6% HP, 16% CP, 10% CP, and 5% CP). Titrations with Cerium Sulphate IV were performed to determine HP concentration. HP release kinetics were evaluated by a spectrophotometric technique. The results were expressed as the mean values and 95% confidence interval of the percentage of hydrogen peroxide content during release kinetics. One sample t-test, one-way ANOVA, Tukey post hoc testing, and Pearson correlation testing were used, as appropriate, with a significance level of α = 0.05. The concentration of titrated HP was higher than that indicated by the manufacturers in all tested products (p < 0.01). At the minimum application times indicated by the manufacturers, all products released at least 85% of HP content; the gel containing 10% CP registered the lowest release at 85.49 (81.52–89.46). There was a significant HP release in all products during the application times indicated by the manufacturers. Further studies are needed to assess in vitro release kinetics.openDias S.; Mata A.; Silveira J.; Pereira R.; Putignano A.; Orsini G.; Monterubbianesi R.; Marques D.Dias, S.; Mata, A.; Silveira, J.; Pereira, R.; Putignano, A.; Orsini, G.; Monterubbianesi, R.; Marques, D