RESUMO
In this study, iron was deposited to titanium dioxide nanotube arrays (TNAs) by impregnation method to enhance its photocatalytic ability. The as-synthesized iron-modified TNAs (Fe-TNAs) was employed in a photoelectrochemical (PEC) system to degrade trichloroethylene (TCE). Results of AFE-SEM analysis showed that the iron nanoparticles (NPs) were successfully attached evenly to the nozzle of Fe-TNAs. Results of XRD analysis confirmed the findings of EDS and XPS, indicating the success of iron modification. The absorption wavelength of Fe-TNAs-27 mL red-shifts to 543 nm which corresponds to the band gap of 2.54 eV after iron modification. Mott-Schottky analysis yielded a donor density of 7.21 × 1020 and 2.30 × 1020/cm3 for TNAs and Fe-TNAs-27 mL, respectively. The photo-generated electrons had a lifetime (τel) of 21.49 and 39.19 ms for TNAs and Fe-TNAs-27 mL, respectively, illustrating the reduce of recombination of photo-generated electron-hole pairs. process. PEC methods performed the most effective way to degrade TCE with a rate constant of 0.079 min-1 in Fe-TNAs PEC system. Mechanism of Fe-TNAs PEC system was proposed in detail.
Assuntos
Nanotubos , Tricloroetileno , Técnicas Eletroquímicas/métodos , Ferro , TitânioRESUMO
OBJECTIVE: To explore the diameter of internal carotid artery by arterial phase imaging of multi-slice spiral computed tomography (CT). METHODS: A total of 260 routine brain CT scans of the examiner were performed. And the arterial phase images of carotid artery were acquired, observed and measured through a three-dimensional reconstruction workstation. On the diameters of target sections were measured on the multiplanar reconstruction (MPR) images of carotid artery. Two groups were categorized according to gender and 3 groups by age (25 - 40 yr, 41 - 60 yr and 61 - 85 yr) for statistical analysis. RESULTS: The diameter data of internal carotid artery had statistical significances among genders and 3 age groups (P < 0.05). CONCLUSION: The diameter of internal carotid artery may be evaluated by the arterial phase imaging of multi-slice spiral CT so that the reference data can be provided for clinical diagnosis.
Assuntos
Artéria Carótida Interna/diagnóstico por imagem , Tomografia Computadorizada Espiral/métodos , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos RetrospectivosRESUMO
OBJECTIVE: To discuss the value of spiral CT in diagnosing infantile intestinal malrotation. METHODS: The spiral CT findings and clinical data of 23 cases of operatively-confirmed infantile intestinal malrotation were retrospectively analyzed. RESULTS: Twenty-three cases of infantile intestinal malrotation were all diagnosed by SCT and confirmed by surgery. The main findings were as follows: whirlpool or concentric circle sign in mesenteric root with midgut volvulus (n = 16); duodenum assumed as "Z" or olecranon spur sign (n = 18); inverted transposition or vertical arrangement of superior mesenteric artery and vein (n = 13); abnormal sign of ileocecal junction and colon in right lower quadrant (n = 23). CONCLUSION: Spiral CT scanning has an important value in the early diagnosis of infantile intestinal malrotation.