Geomatics and Information Science of Wuhan University,Vol 41,No. 05
Synthetic aperture radar (SAR) permits all-time, all-weather observation and strong penetration, and is widely used in disaster monitoring and evaluation, resource exploration, and military reconnaissance. However, speckle noise seriously affects the quality of SAR images, thus limiting the use of SAR image for quick access to information. In this paper, a new road damage extraction method for high-resolution SAR images based on GIS data and Bayes network is proposed. Guided by GIS data, suspected damaged roads are extracted using the fusion of level-set segmentation and an improved D1 line detection. A Bayes network is applied to further confirm real damaged roads based on multievidence and the observed values from suspected damage road, to eliminate the false-alarms from the SAR images. Experimental results indicate that our proposed method can extract road damage information quickly and accurately.
Acta Microbiologica Sinica,Vol 56,No. 05
[ Objective] To identify and characterize an electrogenic bacterium SE6 isolated form forest soil. [ Methods] Pure culture of the strain was obtained by anaerobic incubation. It was identified based on morphology, physiology and biochemistry, and 16S rRNA gene sequencing analysis. The strain was inoculated in a dual chamber microbial fuel cell with LB medium as anolyte and potassium ferricyanide as catholyte, to characterize its electrogenic ability. Electrochemical impedance spectroscopy was conducted to analyze internal resistances of the MFCs. Extracellular electron transfer mechanism of the strain was explored by cyclic voltammetry. Biofilm on the anode surface was observed using scanning electron microscope. [ Results] The 16S rRNA gene sequence of strain SE6 was 100 % phylogenetically related to Clostridium sporogenes. Their morphological and physiological and biochemical characteristics were identical. The maximum power density of the MFCs inoculated with SE6 was 44.42 mW/m 2. The anodic resistance, cathodic resistance and ohmic resistance were 1 488 ± 193 Ω/cm 2, 0.92 ± 0.01 Ω/cm 2 and 20.69 ± 1.76 Ω/cm 2, respectively. Cyclic voltammograms indicated the existence of an electrochemically active substance, of which the peak currents were linearly correlated with the scanning rates. The 1 μm-rodshaped bacteria densely attaching to the anode surface were observed in scanning electron micrographs. [ Conclusion] A novel electrogenic strain of C. sporogenes wasisolated from forest soil, which transfers electrons extracellularly to electrode with high resistance.
Chinese Journal of Scientific Instrument,Vol 37,No. 03
Thermal interference characteristic is one of important factors influencing the thermal structure design of micro-hotplate gas sensor array. In order to investigate the thermodynamic characteristic of micro-hotplate array sensor units, the four-unit micro-hotplate gas sensor array with thermal isolation structure is designed and fabricated, which provides an independent heating function. The sensor array unit consists of Al N ceramic substrate and Pt electrodes. Thermal isolated holes are prepared in the middle heating area of sensor array units using the laser micromachining technology in order to enhance the heating efficiency. The thermal interference simulation analysis of sensor array structure is conducted with the finite element method. The result shows that the design of thermal isolation structure for sensor array is practical. Four kinds of thermal interference modes are provided, and then the thermal interference characteristics are conducted. Thermal interference curves of four-unit array are finally obtained. Experimental results show that when the unit power consumption is 300 mW, the maximum and minimum interference temperatures are about 169.6 °C and 84.7 °C, respectively. The thermal conduction loss of sensor unit can be effectively reduced by employing the thermal isolation holes, and the thermal interference analysis is of great importance to the structural design of micro-hotplate sensor array.
Characteristics of Land–Atmosphere Energy Exchanges over Complex Terrain Area of Southeastern Tibetan Plateau under Different Synoptic Conditions
Chinese Journal of Atmospheric Sciences,Vol 40,No. 04
The geographical environment of the Tibetan Plateau is complex. Previous studies of land surface–boundary layer processes mainly focused on different underlying surfaces without complex topography. The characteristics of land–atmosphere exchanges of energy on different underlying surfaces over complex terrain area of the Tibetan Plateau under different synoptic conditions are analyzed in the present study based on observations collected at four ground sites during May 20 th to July 9 th 2013 over Linzhi. Results indicate that in the case when the downward shortwave radiation is roughly the same at all the sites, sensible heat flux at the northern slope site, which is covered by broad-leaved forest and characterized by steep terrain, is greater than that at the other three sites; latent heat flux at the southern site, which is covered by wheat and thus with large vegetation fraction, is the largest among the four sites. Energy fluxes show obvious diurnal variation at each individual site. In sunny days, sensible heat flux and net radiation are significantly greater than that in rainy days. However, latent heat flux has little changes under different synoptic conditions. The influence of complex terrain of the Tibetan Plateau on sensible heat flux is more significant than that of different synoptic conditions. Different topographies have significant impacts on latent heat flux on rainy days. When the warm moist southwesterly flow in front of the South Asia monsoon trough affects Linzhi, the weather will be dominated by cloudy and rainy days. Otherwise sunny days are prevalent in this region. Apparently the variation of monthly land–atmosphere fluxes over Linzhi area is modulated by the South Asia monsoon activities.
Fingerprint Comparative Analysis of Cistanche deserticola Y.C. Ma and Cistanche tubulosa (Schrenk) Wight
Chinese Pharmaceutical Journal,Vol 51,No. 13
OBJECTIVE To establish the UPLC fingerprint of Cistanche deserticola Y. C. Ma and Cistanche tubulosa (Schrenk) Wight. METHODS The UPLC fingerprints of 10 batches of C. deserticola and C. tubulosa were determined on an ACQUITY UPLC ?BEH C 18 column (2.1 mm × 50 mm, 1.7 μm) eluted with the mobile phase consisting of 0.2% formic acid solution and acetonitrile in gradient mode at a flow rate of 0.4 mL·min ?1, the column temperature was 40 °C, and the detection wavelength was set at 240 nm. The chemical attribution of the fingerprint was determined by reference substance comparison method. RESULTS The common mode of the UPLC fingerprint of C. deserticola and C. tubulosa was set up under the established conditiom. There were 15 common peaks in the fingerprints of 10 samples, five of which were identified. The similarities varied from 0.667 to 0.905 and from 0.249 to 0.991 for Cistanche deserticola Y. C. Ma and Cistanche tubulosa (Schrenk) Wight, respectively. There was significant difference in the fingerprints between C. deserticola and C. tubulosa. CONCLUSION The method is simple and reliable, which can be readily utilized for distinguishing C. deserticola from C. tubulosa and their quality control.