38 research outputs found
Se l'aria ci avvelena. Da vent'anni in Lombardia
No full textOgni anno centinaia di sostanze chimiche nuove prodotte dall’uomo sfuggono nell’ambiente, oltre a molte esalate da fonti naturali, e possono causare danni alla salute umana e agli ecosistemi nelle regioni più avanzate, come la Lombardia.
Qui respiriamo, tra l’altro, monossido di carbonio (CO), biossido di zolfo (SO2), ossidi di azoto (NOx), composti organici volatili (VOC), ozono (O3), metalli pesanti, particolato atmosferico (PM 2,5 e PM 10): cioè gas che hanno differenti reattività e capacità di diffondere su distanze lunghe o corte e inquinare estesi territori.
L’aria della Lombardia, come di tutta la pianura padana, negli ultimi vent’anni è stata molto inquinata, ed ha indotto effetti sia acuti sia cronici sulla salute: da irritazioni respiratorie e gravi malattie cardiache e polmonari, a infezioni acute nei bambini e bronchiti croniche negli adulti, a leucemie e tumori, con mortalità prematura e ridotta speranza di vita.
I dati della più accurata e recente ricerca scientifica, italiana e internazionale, mettono in guardia sulle principali conseguenze del respirare polveri sottili e smog.
Il libro ne presenta in breve i meccanismi d’azione sulla popolazione, come pure su animali e piante in diverse zone lombarde
Polymer-based electrochromic devices
No full textElectrochromic phenomena related to p-doping-undoping process of thiophene-based polymers are briefly described. Electrochromic performance data of poly(2,2'-bithiophene) and poly(3-methylthiophene) polymers, electrosynthesized from 2,2'-bithiophene and 3-methylthiophene commercial products in optimized conditions, to evaluate the possibility of their use in electrochromic devices are surveyed, and the test results of a poly(3-methylthiophene)-based electrochromic device operating in transmissive mode with counter electrode optically passive are reported. Finally, electrochromic performance data of 3-methylthiophene polymers with "tailor-made" conjugation length through electrochemical polymerization of 3-methylthiophene dimers are reported and discussed. © 1992
Effects of gamma-radiation on the polymer electrolyte (PEO)8/LiClO4
No full textThe polymer electrolyte formed with poly(ethylene oxide), P(EO) and LiClO4 in the n = 8:1 ratio (n = [EO units]/[Li]) was exposed to γ-radiation at room temperature in aqueous solution, then dried and characterized using thermal and conductivity measurements. Its improved electrical and mechanical properties, in comparison with those of the non-irradiated material, suggest that cross-linked P(EO)8·LiClO4 can advantageously replace the usual polymer electrolyte of the same composition in electrochemical devices in the solid state
Thermal evolution of tetramethylammonium tetrafluoborate and perchlorate investigated through dielectric and IR spectroscopy
No full textAn investigation of the permittivity and ac conductivity was performed for the first time on the isostructural tetrasubstituted alkylammonium (CH 3)4NBF4 and (CH3) 4NClO4 single crystals, in the wide temperature range 12-300 K. For both the explored compounds, an orientational order/disorder phase transition was brought out as a result of the overlapping of two distinct transitions occurring with different dynamics. The first one is the settlement of a stable array, at low temperature, of the anionic groups (orientationally disordered at RT) with a first order character; the second one is the correspondent cationic sublattice rearrangement with the characteristics of second order. The critical temperatures and limits of the transitions were defined. Different conductivity processes above and below the transition were detected and analyzed. At lower temperatures the intra- and inter-molecular motions of the cationic group were brought out through their contribution to the dielectric constant. The temperature values of the freezing out of the vibrational motions were experimentally established for both the observed ionic crystals. Furthermore, the IR spectroscopy has provided spectra of the vibrational modes in the different phases below and above the phase transition, in excellent agreement with the dielectric data. In a general perspective, the obtained results clearly suggest that the thermal evolution displayed by the two investigated compounds is characteristic of the isostructural tetramethylammonium salts; the expected variations for different anionic groups are discussed
ELECTRICAL INSTABILITY IN CUO1-X - POSSIBLE CORRELATIONS WITH THE CUO-BASED HIGH-TEMPERATURE SUPERCONDUCTORS
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"Altrimenti siamo... fritti" - Campagna di sensibilizzazione sulla raccolta degli oli esausti nelle scuole della provincia di Pavia
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OBIETTIVO QUALITA’ DELLA VITA: Sicurezza Stradale e Qualità dell’aria nell’auto.
No full textSeconda monografia dedicata alla qualità dell'aria in auto ed alle conseguenze fisiopatologiche della respirazione di inquinanti indoo
