1,721,032 research outputs found
Erratum: Identification of the goat CSN1S1F allele by means of PCR-RFLP method (Animal Genetics (2000) 31 (342))
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Ramunno L., Cosenza G., Pappalardo M., Pastore N., Gallo D., Di Gregorio P. & Masina P. (2000) Identi®cation of
the goat CSN1S1F allele by means of PCR-RFLP method. Animal Genetics 31, 34
Verifica di un modello concettuale basato sulla geometria frattale tramite l'interpretazione di una prova di pompaggio in un acquifero fratturato e carsico
No full textProcess for treating and generating energy from biomasses
No full textThe present invention relates to a process for the treating and generating energy from biomass and a plant where the process is implemented, said process comprising the steps of (i) providing a biomass (1), and characterized by comprising the steps of: (ii) diluting the biomass (1) with a thinner up to a volatile solids content comprised between 0.5% and 1% of the volume of said biomass (1); (iii) alkalizing the biomass (1) of item ii with a basic solution (3), up to a pH comprised between 11.0 and 13.0, wherein said biomass (1) of item ii and said basic solution (3) are in a weight ratio comprised between 1 :20 and 1 :80; (iv) hydrolysing the alkalised biomass of item iii, for a time comprised between 30 and 90 minutes, at a temperature comprised between 55°C and 80°C, thereby obtaining a hydrolysed biomass (4); (v) neutralising the hydrolysed biomass (4) of item iv, through diffusion of C02 from a biogas produced by anaerobic digestion, thereby obtaining a hydrolysed and neutralised sludge (5); (vi) performing anaerobic digestion, through a first anaerobic digestor (6), of said hydrolysed and neutralised sludge (5), thereby obtaining a biogas (60), a first digestate (61), an anaerobic sludge (62)
ANALYSYS OF CHLORINATED ETHENES BEHAVIOUR IN FRACTURED AND KARSTIC LIMESTONE
No full textThe understanding of the transport and degradation phenomena of chlorinated ethenes in fractured aquifers as well as the assessment of the cleanup times poses an extreme technical challenge. In the present study a method to analyze reactive transport and reductive dechlorination of chlorinated solvents in fractured aquifers is presented. Reductive dechlorination pathway, adsorption processes, mass exchange phenomena between mobile and stagnant zones as well as the non – linear flow behaviour in fractures are considered. The developed methodology, considering reductive dechlorination processes in a Lagrangian framework, is able to simulate the motion of particles affected by first-order network reactions, so that particles move according to their chemical state affecting physical transport processes (advection, dispersion, mass transfer exchange between mobile and stagnant zone). The developed model is applied to a case study of groundwater contamination in the industrial area of Modugno – Bari (Italy), where the limestone aquifer has a fractured and karstic nature. The steady state distribution of the contamination by chlorinated ethenes with the source at the hot spot is obtained and compared with the observed scenario of contamination in order to estimate the plausible transport and degradation processes as well as the mass loading at source. The carried out study represents and valuable tool for deciding the role of natural attenuation in a treatment where the natural attenuation capacity of groundwater can be integrated with engineering methods for site remediation
Numerical model assessment of chlorinated solvents behavior in limestone fractured and karstic aquifer
No full textThe understanding of the transport and degradation phenomena of chlorinated solvents in fractured aquifers as well as the assessment of the clean up times is a challenge.
In the present study a model for reactive transport and reductive dechlorination of chlorinated solvents in fractured aquifers is developed. Rough walled parallel plate model including non-linear flow behavior is coupled with random walk particle tracking incorporating particle exchange between fracture and matrix, adsorption processes and dechlorination reaction network. The developed model is applied to a case study of the groundwater contamination in the industrial area of Modugno – Bari (Italy), where the limestone aquifer presents a fractured and karstic nature.
The steady state distribution of the contamination by chlorinated solvents with the source at the hot spot is obtained and compared with the contaminated observed scenario in order to detect the plausible transport and degradation processes. A sensitivity analysis is performed on the flow, transport and degradation parameters.
Finally, the influence of non – Darcian flow regime on the contaminated transport is put in evidence simulating the effect of multiple pumping and reinjection of the treated groundwater
Experimental Investigation on Water Seepage through Transparent Synthetic Rough-Walled Fractures
Full text linkOne of the impacts of climate changes nowadays is the increase in the frequency of highintensity rainfall events alternating with extreme dry periods, which affect the components of the
hydrologic cycle, such as runoff, infiltration, and aquifer recharge. Several experimental investigations and theoretical studies have demonstrated that infiltration flow in fractured media can develop along preferential pathways. However, the prediction of infiltration phenomena in fractured
media still remains an open issue. This, together with erratic rainfall patterns due to climate changes,
affects the prediction of aquifer recharge and contaminant transport in fractured aquifers. The present work contributes to reducing this research gap by means of experimental investigation and
forecast analysis, with a focus on the geometrical properties of single fractures and their influence
on flow patterns. Several fracture surfaces based on different fractal dimensions, standard deviations, and mismatch lengths were designed using the SynFrac model and were generated by 3D
printing technology. The results revealed that the fracture’s fractal dimension has a significant impact on the number of flow paths, while the fracture inclination only increases the number of intermediate preferential channels, and, hence, modifies the flow rate distribution over the fracture outlet. Additionally, the change in the inclination angle of the dry fracture from 55 to 65 degrees resulted in an 8% reduction in the mean width of first flow path. A sensitivity analysis using an M5
tree indicates that there is a linear relationship between flow rate and the exponential form of the
fractal dimension. The location of flow channels is a function of fracture fractal dimension, and the
influence of mismatch length on their location is negligible. Finally, an accurate prediction algorithm with a Nash value of 0.81 was developed using Wavelet transform in order to estimate the
time series of periodic flow rates over the fracture outle
Autophagy master regulator TFEB induces clearance of toxic SERPINA1/?-1-antitrypsin polymers.
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a laboratory physical model to analyse flow and transport processes in porous and fractured rock samples at bench scale level
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