1,720,992 research outputs found
Effects of organic amendments and herbicidal treatments: effects on soil microbial biomass
No full textValutazione tramite EUF della ripartizione delle forme disponibili di azoto nel suolo in relazione a differenti colture
No full textInfluenza di differenti rotazioni colturali sul pool azotato del suolo estraibile in KCl 2M
No full textProposta di un metodo matriciale per lo studio di impatto ambientale applicato alla realizzazione di una diga in terra con invaso ad uso irriguo
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Damage of repeatedly nitrocarburised steel dies for aluminium extrusion
Full text linkThe dies employed for the hot extrusion of aluminium alloys are subjected to repeated cycles of nitriding, or nitrocarburising, after service periods of given length. Three dies, fabricated with ISO X40CrMoV5-1 (AISI H13) steel and liquid nitrocarburised, were examined either in the asfabricated condition, or after one service period, or after 12 nitrocarburising and service cycles (end of life). Samples cut from the die subjected to one service period were re-nitrocarburised for increasing durations and similarly examined. The examination methods included X-ray diffraction, metallography, microhardness profile measurements and SEM fractography. The service temperature induced microstructural modifications in the core and in the case. Microcracks and wear craters, due to adhesive wear, occurred at the bearing surfaces. The wear mechanisms at a bearing surface, the microstructural evolution close to the same surface, the fatigue crack nucleation and early growth, and their interrelations and consequences during the whole die life are discussed
Modificazioni indotte da differenti pratiche agronomiche su alcuni parametri biochimici e microbiologici del suolo
No full textBiochemical parameter changes in urban waste compost used as biofilter for pesticides decontamination. International
No full textDegradazione e adsorbimento di chlorpyrifos e metalaxyl nel suolo ed in materiali organici di scarto
No full textInfluenza dello spargimento di cenere da legno su alcune proprietà chimico-fisiche e biochimiche di un suolo franco-argilloso.
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