532 resultados para tires


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In this study, a combination of enzyme-linked receptor assay (ELRA) and yeast estrogen screen (YES) assay was firstly applied to determine whether automobile tires immersed in fresh water can leach chemicals, which display estrogenic activity. We optimized ELRA substituting the chromogene substrate by a luminescent one, and found that luminescent ELBA was more sensitive to 17 beta-estradiol (17 beta-E2) with a detection limit of 0.016 mu g/l, compared to 0.088 mu g/l in the chromogene version. In ELRA, all tire leachates obviously showed estrogenic activity, which was increased with duration of immersion. Moreover, the leachate from hackled tires showed more potent estrogenicity than that from the whole ones. In comparison to ELRA, no detectable estrogenic activity was found in all tire leachates with YES assay. The results from YES assay further evidenced that antiestrogenic compounds can be leached from tires. As tire leachates contain estrogenic compounds, they could be important pollution sources, potentially harmful to wildlife and human health. Thus, use of shredded tires as road fill or in landfill sites should arouse our attention.

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Granules of waste tires were pyrolyzed tinder vacuum (3.5-10 kPa) conditions, and the effects of temperature and basic additives (Na2CO3, NaOH) on the properties of pyrolysis were thoroughly investigated. It was obvious that with or without basic additives, pyrolysis oil yield increased gradually to a maximum and subsequently decreased with a temperature increase from 450 degrees C to 600 degrees C, irrespective of the addition of basic additives to the reactor. The addition of NaOH facilitated pyrolysis dramatically, as a maximal pyrolysis oil yield of about 48 wt% was achieved at 550 degrees C without the addition of basic additives, while a maximal pyrolysis oil yield of about 50 wt% was achieved at 480 degrees C by adding 3 wt% (w/w, powder/waste tire granules) of NaOH powder. The composition analysis of pyrolytic naphtha (i.b.p. (initial boiling point) similar to 205 degrees C) distilled from pyrolysis oil showed that more dl-limonene was obtained with basic additives and the maximal content of dl-limonene in pyrolysis oil was 12.39 wt% which is a valuable and widely-used fine chemical. However, no improvement in pyrolysis was observed with Na2CO3 addition. Pyrolysis gas was mainly composed of H-2, CO, CH4, CO2, C2H4 and C2H6. Pyrolytic char had a surface area comparable to commercial carbon black, but its proportion of ash (above 11.5 wt%) was much higher.

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Traité de science occulte, en deux parties, la première (page 8), en 19 chapitres, appelée « Science de la terre », la seconde (page 234), en 20 chapitres, « Science du nom » ou traité de « Néomance » ou « Néomancie ». Figures dans la 2e partie. — Table des chapitres à la fin du volume. En tête du volume (page I), grand dessin lavé, représentant Jacques de Souvré, en buste, avec ses armoiries. A la page III, on lit : « Ex dono d[omini] Vallant. »

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On y remarque : « Ordonnances d'Admiralité, » 1517 (fol. 187) ; — « Oraison de monsr. le chancellier Olivier pour le Roy en la convention des estatz de Allemaigne » (fol. 257) ; — « Abbus de court d'église et des officiers de l'archevesque de Rouen » (fol. 278) ; — Deux mémoires sur les Ambassadeurs (fol. 318) ; — « Estat des deniers deubz sur les finances de ce royaume, tant à interestz que autrement du temps des feuz roys de bonne mémoire Françoys Ier et Henry IIe » (fol. 367). Provient peut-être d'Émery Bigot.

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Contient : Academia Parisiensis viros clarissimos Galilæi familiares et amicos lyncæos precatur, uti sequentibus in Dialogorum libros notis respondeant... et ad eximium geometram Genuensem D. Sanctininum mittant,... 1643 »

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Comprend : Vie de Molière ; Molière et la comédie ; Extraits du Discours sur la comédie

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Comprend : Vie de Molière ; Molière et la comédie ; Extraits du Discours sur la comédie

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Comprend : Vie de Molière ; Molière et la comédie ; Extraits du Discours sur la comédie

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Comprend : Vie de Molière ; Molière et la comédie ; Extraits du Discours sur la comédie

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Comprend : Vie de Molière ; Molière et la comédie ; Extraits du Discours sur la comédie