989 resultados para H2O
Resumo:
A diffractive microlens with a cascade focal plane along the main optical axis of the device is fabricated using a low-cost technique mainly including single mask ultraviolet (UV) photolithography and dual-step KOH:H2O etching. Based on the evolutionary behavior of converse pyramid-shaped microholes (CPSMs) preshaped over a {100}-oriented silicon wafer in KOH etchant, the first-step KOH etching is performed to transfer initial square micro-openings in a SiO2 film grown by plasma enhanced chemical vapor deposition (PECVD) and patterned by single mask UV-photolithography, into CPSMs with needed dimension. After completely removing a thinned SiO2 mask, basic annular phase steps with a relatively steep sidewall and scheduled height can be shaped in the overlapped etching region between the neighboring silicon concave-arc microstructures evolved from CPSMs through the second-step KOH etching. Morphological measurements demonstrate a desirable surface of the silicon microlens with a roughness in nanometer scale and the feature height of the phase steps formed in the submicrometer range. Conventional optics measurements of the plastic diffractive microlens obtained by further hot embossing the fine microrelief phase map over the nickel mask made through a common electrochemical method indicate a highly efficient cascaded focusing performance.
Resumo:
CO2H2O 1PmaxRubiscoVcmaxCO2Jmax68PmaxVcmaxJmax6859 220CO2H2O 3EBR0.800CO2H2O20032007CO2H2O0.9350.875-0.0136 mg•m-2•s-113.7 W•m-20.6550.622n=30107CO2-0.138-0.134 mg•m-2•s-12.99%H2O88.585.4 W•m-23.63%59CO2H2O68CO2H2O 4CO2a1 ()VcmaxCa (CO2)H2Oa1LAI ()Ta ()CO2CaH2OCO2205Gaussion25.3%11.1%
Resumo:
(TDLAS)H2OHitran20041393nm500-1300K:7168.437 cm-1,7185.597 cm-11KHz-/1100-1350K80K(6.7%);0.02(10%)
Resumo:
An efficient method for the catalytic reduction of aromatic nitro compounds to the corresponding aromatic amines is reported. In the presence of selenium as a catalyst, the aromatic nitro compounds are quantitively reduced by CO/H2O to form the corresponding amines under atmospheric pressure. The reduction occurs in high selectivity regardless of other reducible functionalities present on the aromatic ring. There exists a phase transfer process of the catalyst selenium in the reaction. (C) 2004 Elsevier B.V. All rights reserved.