Search results for "laboratory"
showing 10 items of 923 documents
From Laboratory Mixes to Full Scale Test: Rutting Evaluation of Bio-recycled Asphalt Mixes
2021
The present paper describes the rutting behavior of innovative mixes incorporating 50% of Reclaimed Asphalt (RA) with bio-materials. They were assessed in the laboratory and in a full-scale accelerated experiment. The innovative mixes studied here contained bio-materials especially designed to help recycling by re-activating the aged binder from RA. Four mixes were evaluated: three of them are manufactured with bio-materials, (two bio-rejuvenators and one bio-binder) and one was a control mix, which was a high modulus asphalt mix (EME2). In this study, the rutting resistance of the four mixes was first evaluated in the laboratory with both European and US methods. The full-scale test was th…
Recovery Estimation of Dried Foodborne Pathogens Is Directly Related to Rehydration Kinetics.
2016
International audience; Drying is a common process which is used to preserve food products and technological microorganisms, but which is deleterious for the cells. The aim of this study is to differentiate the effects of drying alone from the effects of the successive and necessary rehydration. Rehydration of dried bacteria is a critical step already studied in starter culture but not for different kinetics and not for pathogens. In the present study, the influence of rehydration kinetics was investigated for three foodborne pathogens involved in neonatal diseases caused by the consumption of rehydrated milk powder: Salmonella enterica subsp. enterica serovar Typhimurium, Salmonella enteri…
An interlaboratory study as useful tool for proficiency testing of chemical oxygen demand measurements using solid substrates and liquid samples with…
2009
In 2008, the first Proficiency Testing Scheme of Chemical Oxygen Demand (1stCOD-PTADG) was conducted to assess the results obtained for different research groups whose field work is mainly anaerobic digestion. This study was performed using four samples, two solid samples as raw materials and two solid samples to prepare high concentration suspended solid solutions. Invitations were sent to a large number of laboratories, mainly to anaerobic digestion research groups. Finally, thirty labs from sixteen countries agreed to participate, but for different reasons four participants could not send any data. In total, twenty-six results were reported to the COD-PT coordinator. This study showed th…
Implementasi Pembelajaran Fisika Berbasis Laboratorium Virtual terhadap Keterampilan Proses Sains dan Persepsi Mahasiswa
2018
Penelitian ini bertujuan untuk mengetahui penerapan pembelajaran fisika berbasis media laboratorium virtual , Keterampilan Proses Sains (KPS), dan persepsi mahasiswa pada mata kuliah fisika dasar. Metode penelitian menggunakan pre-eksperimental design dan teknik purposive sample digunakan untuk memilih sampel yaitu kelas pendidikan fisika dan pendidikan matematika Universitas Papua. Instrumen dalam penelitian ini yaitu lembar observasi dan penilaian KPS serta angket persepsi mahasiswa yang dinilai di akhir pembelajaran. Hasil penelitian menunjukkan persentase KPS yang diobservasi selama perkuliahan 86,4% ± SD 12,7 meliputi aspek keterampilan menggunakan alat, mengambil data, dan mengkomunik…
Laboratory disruption of scaled astrophysical outflows by a misaligned magnetic field
2021
The shaping of astrophysical outflows into bright, dense, and collimated jets due to magnetic pressure is here investigated using laboratory experiments. Here we look at the impact on jet collimation of a misalignment between the outflow, as it stems from the source, and the magnetic field. For small misalignments, a magnetic nozzle forms and redirects the outflow in a collimated jet. For growing misalignments, this nozzle becomes increasingly asymmetric, disrupting jet formation. Our results thus suggest outflow/magnetic field misalignment to be a plausible key process regulating jet collimation in a variety of objects from our Sun’s outflows to extragalatic jets. Furthermore, they provide…
Determination of organic pollutants in Anguilla anguilla by liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS)
2021
© 2021 The Authors.
Ikea e altre semiosfere. Laboratorio di sociosemiotica
2019
Da quando l’uomo è diventato sapiens sapiens, la vita non ha a che fare solo con la biosfera ma anche con la semiosfera. Con questo termine ci riferiamo ancora a un insieme di elementi eterogenei che hanno la capacità di produrne altri, solo che tali elementi non hanno una natura chimica o biologica, hanno invece a che fare con le straordinarie capacità mentali che l’uomo possiede. Possiamo allora immaginarci questo spazio popolato da prodotti culturali di varia natura: parole, immagini, discorsi, ma anche oggetti, edifici, abiti, cibo, dove a rendere tali elementi parte del sistema non è unicamente la loro natura materiale, peraltro molto diversa, ma la cosa che di volta in volta li accomu…
Generación de fractales a partir del método de Newton
2013
[EN] A large number of fractals known, as Julia fractals and Mandelbrot, can be generated from an iterative method. In this paper we present a virtual laboratory developed as a Graphical User Interface (GUI) of Matlab that allows us to study and visualize in real time the relationship between Newton iterative methods of two variables and the generation of fractals. The main objective is to allow Technical School students in Numerical Computation subjects to acquire the skills to generate fractals and interpret their plots in terms of the convergence or divergence speed of the sequence of iterated.
Frequency of exposure of endangered Caspian seals to Canine distemper virus, Leptospira interrogans, and Toxoplasma gondii
2017
Canine distemper virus (CDV), Leptospira interrogans, and Toxoplasma gondii are potentially lethal pathogens associated with decline in marine mammal populations. The Caspian Sea is home for the endangered Caspian seal (Pusa caspica). In the late 1990s and early 2000s, CDV caused a series of mortality events involving at least several thousand Caspian seals. To assess current infection status in Caspian seals, we surveyed for antibodies to three pathogens with potential to cause mortality in marine mammals. During 2015-2017, we tested serum samples from 36, apparently healthy, Caspian seals, accidentally caught in fishing nets in the Caspian Sea off Northern Iran, for antibodies to CDV, L. …
FORENSIC ANALYSIS OF SAMPLES OF CONFISCATED ABUSE SUBSTANCES, CARRIED OUT IN THE LABORATORY OF ANALYSIS AND DRUGS OF THE CARABINIERI, MILITARY STATIO…
2016
The aim of this study was to define some methods of qualitative and quantitative analysis for technical verification of alleged drugs confiscated by the stations of the Carabinieri in Palermo and Trapani provinces. Observation concerned: the quantity of the confiscated material, the quantity of the active principle, the cutting substances and the consumption in adult and minor population. The Carabinieri ask for analyses of confiscated drugs to the L.A.S.S. laboratory, where the samples are added with the suitable standard and put to ultrasound. Then, the solution is analyzed with gas cromatography and gas mass spectrometry. In 2015 there were 1,000 analysed finds out of 1,454 total finds. …