Analysis of Silage Fermentation Characteristics Using Transflectance Measurements by Near Infrared Spectroscopy

The fermentation end products as lactic acid, volatile fatty acids and ammonia-nitrogen, are important indicators of the efficiency of silage fermentation and are closely related to nutritive value of them (Jaster, 1995). Drying is problematic in the case of silage as many fermentation products are volatile and may get lost during the drying process. This may be a reason why NIR technology is being little used for the evaluation of silage fermentation characteristics. The feasibility of using near infrared transflectance spectroscopy to evaluate the content in fermentation end products of grass and maize fresh silage was investigated in this study

Search for dark matter at √s=13 TeV in final states containing an energetic photon and large missing transverse momentum with the ATLAS detector

Results of a search for physics beyond the Standard Model in events containing an energetic photon and large missing transverse momentum with the ATLAS detector at the Large Hadron Collider are reported. As the number of events observed in data, corresponding to an integrated luminosity of 36.1 fb−1 of proton–proton collisions at a centre-of-mass energy of 13 TeV, is in agreement with the Standard Model expectations, model-independent limits are set on the fiducial cross section for the production of events in this final state. Exclusion limits are also placed in models where dark-matter candidates are pair-produced. For dark-matter production via an axial-vector or a vector mediator in the s-channel, this search excludes mediator masses below 750–1200 GeV for dark-matter candidate masses below 230–480 GeV at 95% confidence level, depending on the couplings. In an effective theory of dark-matter production, the limits restrict the value of the suppression scale M∗ to be above 790 GeV at 95% confidence level. A limit is also reported on the production of a high-mass scalar resonance by processes beyond the Standard Model, in which the resonance decays to Zγ and the Z boson subsequently decays into neutrinos

UTILIZACIÓN DE LA ESPECTROSCOPIA POR REFLECTANCIA EN EL INFRARROJO CERCANO PARA LA PREDICCIÓN DE LA DIGESTIBILIDAD DE LA MATERIA ORGÁNICA. I. FORRAJES VERDES

Se desarrollaron ecuaciones de calibración por reflectancia en el infrarrojo cercano para la digestibilidad enzimática neutro detergente-celulasa y digestibilidad in vivo de la materia orgánica de forrajes verdes. Para la primera (EOMD) se utilizó un conjunto de 187 muestras de muy diferente origen. La validación se efectuó sobre tres conjuntos distintos de 51, 47 y 50 muestras. Las calibraciones para digestibilidad in vivo de la materia orgánica (IOMD) fueron desarrolladas para dos conjuntos de 47 y 178 muestras y validadas sobre los dos conjuntos anteriores de 187 y 51 muestras. Las correlaciones obtenidas para EOMD estaban comprendidas entre 0.94 y 0.87 y el error estándar de predicción (SEP) de 4.06 a 5.48. Para IOMD se obtuvieron correlaciones entre 0.87 y 0.78 y SEP entre 2.29 y 3.78. Se puede por tanto concluir que la técnica NIR puede ser utilizada para muestras de forrajes heterogéneas, con errores estándar de predicción no superiores a los obtenidos con el método fibra neutro detergente-celulas