Wang, Nan
Liu, Hongmei
Zhao, Jianwei
Cui, Yanping
Xu, Zhong
Ye, Yuanfeng
Kiguchi, Manabu
Murakoshi, Kei
In this report, we studied the electron transport through cyclic pi-conjugated molecules. The model system consists of metalloporphyrin with two thiol groups at either 9,11-substitution (P-connection) or 1,5-substitution (D-connection) which form chemical bonds with gold electrodes. We investigated 10 typical bivalent metals as the metal-molecule-metal junctions using first principle density functional theory and nonequilibrium Green's function calculations. Due to the particular electron transport paths, all models in P-connection show similar I-V curves, indicating that the electron does not pass through the metal center in this configuration. In the D-connection, the electron takes the path through the metal center, leading to considerable difference in the I-V curves between the different metalloporphyrins. This means that the D-connected metalloporphyrin is potentially applicable in chemical sensor. We also studied a prototype for chemosensing the CO molecule theoretically at the same level.
In this work, lignin was used as template for the synthesis of porous carbon-CeO2 composites via the cocalcination method. The structure and morphology of composites were investigated by X-ray powder diffractometer, scanning electron microscope and high-resolution transmission electron microscopy. The characterized results indicated that porous carbon was formed due to the decomposition of lignin, and CeO2 nanorods are grown uniformly in the porous carbon to form porous carbon-CeO2 composites. The prepared porous carbon-CeO2 composites were used for the photocatalytic removal of SO2 at room temperature under light irradiation. The photocatalytic activity of carbon-CeO2 was greatly enhanced compared with CeO2. The maximum of photocatalytic conversion of SO2 can be about 51.89% much higher than that of CeO2. The possible mechanism for the photocatalytic oxidation of SO2 was proposed based on the experimental results, and the prepared composites may have potential application for the SO2 removal in actual life. (C) 2014 Elsevier B.V. All rights reserved.
Polyunsaturated fatty acids (PUFA), especially docosahexaenoic acid (DHA, 22:6n-3), are enriched in phospholipids of vertebrate rod outer segments (ROS). Retinal ROS can incorporate 22 carbon (C-22) PUFA from the plasma pool where C-20 PUFA are predominant. In this study, we anaLyzed the fatty acid composition of retinal pigment epithelium (RPE) and ROS from rats fed different fatty acid supplements to determine whether this enrichment is at the photoreceptor-RPE boundary or the RPE-choriocapillaris boundary. Long Evans rats were raised from birth for 13-14 weeks on a diet supplemented with 10% (wt/wt) hydrogenated coconut oil (COC; 0.2% 18:2n-6, no 18:3n-3), safflower oil (SAF; 73.8% 18:2n-6, 0.1% 18:3n-3), or linseed oil (LIN; 16.4% 18:2n-6, 52.2% 18:3n-3). These diets were chosen because they increased plasma leveLs of 20:3n-9, 20:4n-6, and 20:5N-3, respectively. These three fatty acids served as metabolic markers. Plasma levels of 22:6n-3 were reduced by the COC and SAF diets. The RPE incorporated 20:3n-9, 20:4n-6, and 20:5n-3 from the plasma. However, the levels of 20:3n-9 and 20:5n-3 were very low in ROS and 20:4n-6 was not significantly elevated in the ROS of the SAF diet group. The relative amount of total C-20 PUFA in phospholipids in RPE was similar to that found in plasma and was about 4-16 times (depending on different lipid classes) that in the ROS. In contrast, C-22 PUFA (22:6n-3 and 22:5n-6) showed a step-wise, average 3-5 fold increase in concentration from the plasma to the RPE to the ROS. Our data suggest that exclusion of C-20 PUFA from the retina occurs at the RPE-photoreceptor interface and that enrichment of C-22 PUFA occurs at both the plasma-RPE and RPE-photoreceptor interfaces.
A photovoltaic intelligent power supply comprises multiple unit modules, a communication unit (103) and a control unit (106). Some unit modules are connected to the control unit (106) and the communication unit (103). Each unit module comprises an input aggregation unit (101), a data collection unit (102), a voltage step-up unit (104), an arc isolation unit (105), and an anti-PID unit (107). The input aggregation unit (101) is connected to a photovoltaic component. The data collection unit (102) is used to collect voltage and current state signals. The voltage step-up unit (104) is used to perform alternate chopping and works in an MPPT mode. The arc isolation unit (105) is used to receive an instruction delivered by the control unit (106) to perform opening and closing. The anti-PID unit (107) is used to receive an instruction delivered by the control unit (106) to form a suitable direct current voltage to be applied between a negative electrode of a battery panel and the ground. The photovoltaic intelligent power supply supports MPPT control, and can effectively detect an arc and start protection, can ensure normal operation of an inverter, and improve reliability of a power generation system.
Wang, Nan
Gray, Michelle
Lu, Xiao-Hong
Cantle, Jeffrey P
Holley, Sandra M
Greiner, Erin
Gu, Xiaofeng
Shirasaki, Dyna
Cepeda, Carlos
Li, Yuqing
Dong, Hongwei
Levine, Michael S
Yang, X William