中国科学院机构知识库网格系统: 检索

Occurrence, behavior and removal of typical substituted and parent polycyclic aromatic hydrocarbons in a biological wastewater treatment plant 期刊论文 OAI收割
WATER RESEARCH, 2014, 卷号: 52, 期号: 1, 页码: 11-19
作者: Qiao, Meng

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Substituted polycyclic aromatic hydrocarbons A(2)/O process Biotransformation Removal mechanism

Comparison of conventional and inverted A(2)/O processes: Phosphorus release and uptake behaviors 期刊论文 OAI收割
Environmental Sciences & Ecology, 2012, 卷号: 24, 期号: 4, 页码: 571-578
Qi, Rong; Yu, Tao; Li, Zheng; Li, Dong; Mino, Takashi; Shoji, Tadashi; Fujie, Kochi; Yang, Min

收藏 | 浏览/下载：44/0 | 提交时间：2014/11/28

phosphate release and uptake A(2)/O process inverted A(2)/O process activated sludge model

The removal of nutrients from non-point source wastewater by a hybrid bioreactor 期刊论文 iSwitch采集
BIORESOURCE TECHNOLOGY, 2011, 卷号: 102, 期号: 3, 页码: 2419-2426
作者: Wu, Yonghong; Hu, Zhengyi; Yang, Linzhang; Graham, Bruce; Kerr, Philip G.

收藏 | 浏览/下载：30/0 | 提交时间：2019/10/10

A(2)/O process Bacterial community Ecological ditch Non-point source Nutrient

A hybrid median filter for enhancing dim small point targets and its fast implementation (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Multimedia and Signal Processing, CMSP 2011, May 14, 2011 - May 15, 2011, Guilin, Guangxi, China
Yang Q.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

Weak stars and middle altitude orbit satellites or high altitude orbit satellites are presented as dim point targets in images of astronomical observation. They have low intensity and occupy few pixels in image. In most situations the background of sky is always ununiform and there exists pulse noises. Thus results in targets submerging in background noises and low signal noise ratio (SNR). Median filter is an effective method for removing pulse noise. But it can blur image after modifying gray of non-noise pixels when image has low SNR. A hybrid median filter algorithm is proposed to process low SNR dim point targets image. The newly proposed method can suppress the pulse noises also can increase target $SNR$ and does not add extra fake targets. The time complexity of median filter is O(N2)(N is the widow size) and is difficult to implement in hardware. For quasi real time application a fast implementation of our hybrid median filter is proposed to reduce the time complexity to O(N). Experimental results show that the newly proposed algorithm is superior to ordinary median filter and fast median filter by comparing visual effect and performance. 2011 IEEE.

Synthesis and luminescence properties of Eu3+-doped silicate nanomaterial (EI CONFERENCE) 会议论文 OAI收割
17th International Conference on Dynamical Processes in Excited States of Solids, DPC'10, June 20, 2010 - June 25, 2010, Argonne, IL, United states
作者: Zhang J.; Zhang J.; Zhang J.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

In this paper we introduce a sol-gel process for preparing Y 2Si2O7: Eu3+ nanocrystals. The rare earth compounds were dispersed in the SiO2 colloids and the monodisperse nano-scale composite materials were prepared. The reactant mass fraction and heat treatment temperatures could affect the structures and emission spectrum properties of as-synthesized samples. The samples emit the strong red light upon excitation under the ultraviolet. The main peaks originate from 5D0-7F2 electric dipole transition of Eu3+. With regard to the samples treated at different temperatures the emission spectra obtained under 266 nm excitation show different shapes of spectra lines and relative intensities indicating that the Eu3+ ions have been located in different local environments. 2011 Published by Elsevier B.V.

Mechanisms of energy transfer in Pr3+ and Cr3+ codoped SrAl12O19 phosphor (EI CONFERENCE) 会议论文 OAI收割
209th ECS Meeting, May 7, 2006 - May 12, 2006, Denver, CO, United states
作者: Zhang J.; Wang X.-J.; Zhang G.; Zhang G.; Zhang G.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

A two-step energy transfer was observed in Pr3+ and Cr 3+ codoped SrAl12O19 phosphor which results in a two-photon luminescence for one UV/vacuum-UV photon absorbed. For one Pr 3+ ion excited to the lowest 4f5d states two Cr3+ ions may be excited and emit two red photons due to 2E- 4A2 transitions of the Cr3+ ions Cr 3+ ions can be excited into the 4T1(F) levels by cross relaxation of Pr3+ 1S0- 1I6 or by direct energy transfer from Pr3+ 3P0 1 states. The mechanisms of the two-step energy transfer process were studied based on spectra and lifetime measurements. copyright The Electrochemical Society.

Excitonic properties of vertically aligned ZnO nanotubes under high-density excitation (EI CONFERENCE) 会议论文 OAI收割
Lu Y. M.; Liang H. W.; Shen D. Z.; Zhang Z. Z.; Zhang J. Y.; Zhao D. X.; Liu Y. C.; Fan X. W.

收藏 | 浏览/下载：13/0 | 提交时间：2013/03/25

In this paper highly oriented and vertically arranged ZnO nanotubes are prepared on Al2O3 (0 0 0 1) substrate without employing any metal catalysts by plasma-assisted molecular beam epitaxy. The photoluminescence (PL) spectra at room temperature are studied under high excitation densities. Under lower excitation density (60 kW/cm2) PL spectrum shows that one strong free exciton emission (FE) locates at 3.306 eV. As the excitation density increases up to 200 kW/cm2 a new emission peak (Pn) located at low-energy side of FE is attributed to the spontaneous emission due to an exciton-exciton (Ex-E x) scattering process from two ground state excitons where one exciton is recombined by emitting a photon and the other is scattered into the excited states of n=2 3 4.... Under excitation density of 300 kW/cm 2 the stimulated emission originating from Ex-E x scattering is obtained. When the excitation density is above 580 kW/cm2 the emission from electron-hole plasma is observed in low-energy side of the P band and indicates a typical superradiation recombination processes with increasing excitation density. 2006 Elsevier B.V. All rights reserved.

Energy upconversion in erbium doped oxyfluoride tellurite glass (EI CONFERENCE) 会议论文 OAI收割
ICO20: Materials and Nanostructures, August 21, 2005 - August 26, 2005, Changchun, China
作者: Chen B.; Xie Y.

收藏 | 浏览/下载：16/0 | 提交时间：2013/03/25

In this article we have investigated energy upconversion process in erbium doped oxyfuoride tellurite glasses exciated with 980 nm diode laser. The glasses used in measurements are with a mol% composition of 70TeO2-9PbF2-190AlF3-10BaF2-1Er2O3. The s intensity parameters the radiative rates the branching ratios and the fluorescence lifetimes were calculated based upon the Judd-Ofelt theory and the experimental absorption spectrum. Under 980 nm excitation efficient 530 544 and 665 nm upconversion emission are due to two-photon absorption processes.

Electrophoretic deposition and field emission properties of multiwall carbon nanotubes (EI CONFERENCE) 会议论文 OAI收割
19th International Vacuum Nanoelecronics Conference and 50th International Field Emission Symposium, IVNC and IFES 2006, July 17, 2006 - July 20, 2006, Guilin, China
作者: Jiang H.; Song H.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

Carbon nanotubes were dispersed in isopropyl alcohol solution which containing 210-5 mol/L dissolved Mg(NO3) 2·6H2O. The nanotubes were deposited on the conducting substrates as field emitters with electrophoretic deposition method. Some carbon nanotubes film specimens with different thickness were obtained by adjusting the deposition time. The field emission properties have been tested with a diode structure below 110-4 Pa. CNTs film deposition thickness around 1.4 m showed higher field emission current. During the electrophoretic deposition process the magnesium hydroxide formatted too. The metal hydroxide existing in the carbon nanotube film and on the substrates would affect on the field emission properties evidently. 2006 IEEE.

Vacuum annealing effects on properties of ITO films prepared by reactive low voltage ion plating technique (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Devices and Instruments, August 21, 2005 - August 26, 2005, Changchun, China
作者: Wang X.

收藏 | 浏览/下载：15/0 | 提交时间：2013/03/25

With reactive low voltage ion plating technique ITO (indium oxide doped with tin) films were deposited on glass substrates by using ITO pellet with a composition of 90 wt.% In2O3 and 10 wt.% SnO2 without extra heating. The post annealing process was done in vacuum with different annealing temperature at 100 200 300 and 400C for 2 hours respectively. The effects of vacuum annealing on structural optical and electrical properties of the ITO film deposited by RLVIP were studied in detail. The results showed that the crystalline of the film was improved with the higher temperature. The increase of the annealing temperature improved the infrared reflectivity from 30% to 80% over 8-14m of the infrared atmosphere window and a simultaneous variation in the optical transmission of the visible spectral region occurred. In addition sheet resistance of ITO films had contrary changing trend with the IR reflectance as well.