A bench-scale comparative study between gas-water alternative membrane bioreactor (AMBR) and traditional submerged membrane bioreactor (SMBR) treating synthetic municipal wastewater was conducted ...with respect to the effects of carbon and nitrogen removal and membrane fouling. The results showed that both the AMBR and the SMBR had very good removal in COD and NH4+ -N of more than 96%. In SMBR, carbon and nitrogen removal was enabled by biomass in bulk liquid, while in AMBR, it was supposed to be functioned mainly by the biofilm attached to the surface of hollow fiber membrane since little sludge was found in the bulk liquid. However, TN removal was 76.94% in AMBR and 52.41% in SMBR, showing a more effective denitrification in AMBR compared to SMBR. Also, AMBR was found to be more effective in membrane fouling alleviation than SMBR through long time investigation of trans-membrane pressure.
The authors report the fabrication of a deep-ultraviolet sensitive a-ZITO thin-film-transistor (TFT) with a Ta 2 O 5 gate dielectric. It is found that carrier mobility, threshold voltage, and ...sub-threshold swing are 106.2 cm 2 /Vs, 0.75 V, and 0.45 V/decade, respectively, measured in the dark. It is also found that measured current increased from 2.3 × 10 -9 A to 7.97 × 10 -5 A, as we illuminated the sample with λ = 250-nm UV light when V G is biased at 0 V. Furthermore, it is found that deep-UV-to-visible rejection ratio could reach 2.3 × 10 5 for the fabricated Ta 2 O 5 /a-ZITO TFT.
We report the growth of high-density single crystalline ZnO nanowires on a patterned ZnO:Ga/SiO
2/Si template, the adsorption of Pt nano-particles on the nanowire surface, and the fabrication of a ...ZnO nanowire-based NH
3 gas sensor. It was found that the sensor responses were 22.5% and 36% for the nanowires without and with Pt adsorption when the chamber was injected with 1000 ppm of NH
3 gas at 300 °C. With Pt adsorption, it was found that the measured sensitivities were around 16%, 22%, 26% and 36% when the concentration of the injected NH
3 gas was 100, 200, 500 and 1000 ppm, respectively.
The authors report the growth of β-Ga 2 O 3 nanowires and the conversion of β-Ga 2 O 3 nanowires to gallium nitride (GaN) nanowires through ammonification, and the fabrication of nanowires-based ...field emitters. The threshold field of Ga 2 O 3 nanowires was 5.65 V/μm. After ammonification under 750, 800 and 900°C, the threshold fields became smaller which were 3.82, 3.03 and 2.12 V/μm, respectively. While the ammonification temperature was increased to 950°C, the threshold field drastically increased to 13.13 V/μm.
Three pepsinogens (PG1, PG2, and PG3) were highly purified from the stomach of freshwater fish snakehead (Channa argus) by ammonium sulfate fractionation, anion exchange, and gel filtration. ...Two-dimensional gel electrophoresis and native-PAGE analysis revealed that their molecular masses were 37, 38, and 36 kDa and their isoelectric points 4.8, 4.4, 4.0, respectively. All of the pepsinogens converted into their active form pepsins under pH 2.0 by one-step pathway or stepwise pathway. The three pepsins showed maximal activity at pH 3.0, 3.5, and 3.0 with optimum temperature at 45, 40, and 40 °C, respectively, using hemoglobin as substrate. All of the pepsins were completely inhibited by pepstatin A, a typical aspartic proteinase inhibitor. The N-terminal amino acid sequences of the three pepsinogens were determined to the 34th, 25th, and 28th amino acid residues, respectively. Western blot analysis of the three PGs exhibited different immunological reactions.
