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The integration of methanogenesis with denitrification and anaerobic ammonium oxidation in an expanded granular sludge bed reactor

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Journal of Environmental Sciences 2003年第3期15卷 423-432页

作者： ZHANG Dai-jun 1,2.(1. Department of Environmental Science, Chongqing University, Campus A, Chongqing 400044, China 2. Key Laboratory for the southwest China Resources Exploitation and Environmental Disaster Control Engineering, Ministry of Education, China.) Department of Environmental Science Chongqing University Campus A 重庆 400044

The integration of methanogenesis with denitrification and anaerobic ammonium oxidation(ANAMMOX) was studied in an expanded granular sludge bed(EGSB) reactor in this work. Experimental results from the continuous treatment of wastewater with nitrite and ammonium, which lasted for 107 days, demonstrated that wastewater with high nitrite and ammonium could be anaerobically treated in an expanded granular sludge bed reactor. More than 91% to 97% of COD were removed at up to about 3.9 g COD/(L·d) of COD volumetric loading rate. More than 97% to 100% of nitrite was denitrified at up to about 0.8 g NO -_2.N/(L·d), which is 16 times higher than that in a conventional activated sludge system with nitrification/denitrification(0.05 gN/(L·d)). No dissimilatory reduction of nitrite to ammonium occurred in the process. However, maximum of about 40% ammonium was found to be lost. Batch tests of 15 days with sludge from the reactor showed that 100% of nitrite was denitrified completely, and about 3% of ammonium was removed when only ammonium (34.3 mg/L) and nitrite(34.3 mg/L) were added into the sludge suspension medium. Furthermore, about 15% of ammonium amounts were lost with organic COD addition. It suggested that the methanogenesis in the system could enhance ANAMMOX because of intermediate hydrogen produced during methanogenesis.

关键词： methanogenesis denitrification ANAMMOX EGSB reactor

Paleomagnetic results of the Cretaceous marine sediments in Tongyouluke, southwest Tarim

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Science China Earth Sciences 2005年第3期48卷 406-416页

作者： SHEN Zhongyue1, CHEN Hanlin1, FANG Dajun1, DING Jinghai1, ZHANG Shiben2. HUANG Zhibin2.& LI Meng2.1. Department of Earth Sciences, Zhejiang University, Hangzhou 31002. China 2. Tarim Oil Field Company, PetroChina Company Limited, Korla 830011, China Department of Earth Sciences Zhejiang University Hangzhou China Tarim Oil Field Company PetroChina Company Limited Korla China

Paleomagnetic and rock magnetic studies on samples of 18 sites from the Creta- ceous marine sedimentary rocks in the Tongyouluke section, Akto County, southwest Tarim, China show that the magnetic carriers of the Lower Cretaceous are dominated by hematite with some magnetite, while the magnetic carriers of the Upper Cretaceous are characterized by a combination of magnetite and titanomagnetite as well as hematite and goethite. Stepwise thermal demagnetization is performed and vector analysis is used to isolate magnetic components, which illustrates a single magnetic component or double magnetic components. The high temperature stable components are dual polarities and pass polarity test, reversal test and consistency test. The overall mean direction of the Lower Cretaceous is D = 2..0°, I = 42.0°, α95=6.5° with pole position at φ = 190.3°, λ=63.1°, dp=4.9°, dm=8.0°. The overall mean direction of the Upper Cretaceous is D = 2..1°, I = 39.4°, α95=11.2. with pole position at φ =190.9°, λ=60.3°, dp= 8.0°, dm=13.4°. Compared with the inclination of the Early Cretaceous from red beds of north Tarim, the contemporary inclination of southwest Tarim is 10.0°±7.8° sharper, but it is still 8.1° ±8.9°, shallower than that of Early Cretaceous basalts in southwest Tarim. Although these pa- leomagnetic data show slightly larger confidence limit, the paleolatitude of the marine Cretaceous tends to lie between that of terrestrial red beds and volcanic rocks.

关键词： Tarim paleomagnetism, Cretaceous, magnetic inclination, red beds, marine sedimentary rock.

Studies on the microstructure,optical and electrical properties of organic microcavity devices based on a porous silicon reflector

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Science China(Technological Sciences) 2005年第2期48卷 191-201页

作者： XIONG Zuhong1, FAN Yongliang2. ZHAN Yiqiang2. ZHANG Songtao2. DING Xunmin2.& HOU Xiaoyuan2.1. School of Physics, southwest China-Normal University, Chongqing 400715, China 2. Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 2.0433, China School of Physics Southwest China-Normal University Chongqing China Surface Physics Laboratory (National Key Laboratory) Fudan University Shanghai China

A novel type of microcavity organic light-emitting diode based on a porous silicon distributed Bragg reflector (PS-DBR) has first been achieved and its microstructure, optical, and electrical properties have also been investigated in detail. The microcavity is made up of the central active organic multilayer sandwiched between a top silver film and a bottom PS-DBR, formed by electrochemical etching of p++-Si substrate. The field- emission scanning electron microscopy cross-section images show the nanometer-scale layered structure and flat interfaces inside the microcavity. The reflectivity (relative to an Al mirror) of the PS-DBR is up to 99%, and the stopband is about 160 nm wide. Resonant cavity mode appears as a tip in the reflectivity spectrum of the Si-based organic multilayer films, which is a symbol that the Si-based organic multilayer structure is indeed a microcavity. The peak widths of the electroluminescence (EL) spectra from the cavities emitting green and red light are greatly reduced from 85 nm and 70 nm to 8 nm and 12.nm, respectively, as compared with those measured from non-cavity structures. Note that the EL emission from the cavity devices is single-mode, and the off-resonant optical modes are highly suppressed. Moreover, increases of a factor of about 6 and 4 of the resonant peak intensity from the cavities emitting green and red light are also observed, respectively. In addition, the current-brightness-voltage characteristics and effect parameters on the lifetime of the cavity devices are also discussed. The present technique for obtaining enhanced EL emission from Si-based organic microcavity may also be another novel effective method for realizing Si-based optoelectronics device integration.

关键词： electrochemical etching, Si-based microcavity, electroluminescence, organic light-emitting diodes.

Ecological Footprint and Ecological Security Evaluation in the Upper Min River Basin

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Wuhan University Journal of Natural Sciences 2005年第4期10卷 641-646页

作者： TU Jian-jun 1, 2.1. School of Resources and Environment Science, southwest China Normal University, Chongqing 400715, China 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China School of Resources and Environment Science Southwest China Normal University Chongqing China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu Sichuan China

On the basis of the ecological footprint (EF) model, this paper studied theecological security in the Upper Min River Basin ecosystem. The result shows that with 2. 038 2.hm^2.er capita ecological capacity (0. 42. 2.hm^2.higher than per capita EF) ,and 165 82. hm^2.ecologysurplus , the ecosystem in Upper Min River is generally secure at present. But the arable land isoverweighed and omens an eco-security crisis. Meanwhile, problems such as low forest coverage rate,severe loss of water and soil,enlargement of arid-valley area, frequent occurrence of mountainhazards and degradation of pastures have been major threats to the eco-security of this region. Thecalculation result of ten-thousand-yuan ( RMB) GDP shows that the use of natural resources isextensive, and there will be a rapid increase tendency of EF in the future. In order to maintain thepresent eco-security, the ways of use natural resources must be improved in the Upper Min RiverBasin.

关键词： ecological security ecological footprint ecological capacity quantitativeevaluation the Upper Min River Basin

An aperiodic phenomenon of the unscented Kalman filter in filtering noisy chaotic signals

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Progress in Natural Science:Materials International 2007年第10期17卷 1235-1240页

作者： Fan Hongjuan1, Feng Jiuchao1,2. Xie Shengli2.and Wang Shiyuan1(1. Faculty of Electronic and Information Engineering ,southwest University, Chongqing 400715, China 2. School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641, China) Faculty of Electronic and Information Engineering Southwest University Chongqing 400715 China School of Electronic and Information Engineering South China University of Technology Guangzhou 510641 China

A non-periodic oscillatory behavior of the unscented Kalman filter (UKF) when used to filter noisy contaminated chaotic signals is reported. We show both theoretically and experimentally that the gain of the UKF may not converge or diverge but oscillate aperiodically. More precisely, when a nonlinear system is periodic, the Kalman gain and error covariance of the UKF converge to zero. However, when the system being considered is chaotic, the Kalman gain either converges to a fixed point with a magnitude larger than zero or oscillates aperiodically.

关键词： chaos unscented Kalman filter Lyapunov exponents aperiodicity.

Semantic theory of finite lattice-valued propositional logic

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Science China(Information Sciences) 2010年第10期53卷 2022-2031页

作者： PAN XiaoDong 1,2.& XU Yang 2.1 School of Maths, southwest Jiaotong University, Chengdu 610031, China 2.Intelligent Control Development Center, southwest Jiaotong University, Chengdu 610031, China School of Maths Southwest Jiaotong University Chengdu China Intelligent Control Development Center Southwest Jiaotong University Chengdu China

Based on the methodology of Pavelka’s fuzzy propositional logic, in this paper, by combining L-fuzzy set and classical two-value propositional logic theory, a kind of graded semantic theory in lattice-valued propositional logic based on finite lattice implication algebras is established. The notions of L-tautology and L-contradiction are introduced, and several theorems about the relations among different kinds of L-tautologies are given. From the viewpoint of uncertainty reasoning, the notion of satisfiability with certain level for a set of formulas is also defined. On this basis, the semantic consequence operation concerning a set of formulas is proposed, and the properties of semantic consequence operation and the consistency of fuzzy information are discussed.

关键词： lattice-valued propositional logic semantic theory L-tautology consistency lattice implication algebra

Tensile properties and fracture behavior of Ti_2.lNb based alloys at room temperature

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中国有色金属学会会刊：英文版 2000年第3期10卷 378-381页

作者： PENG Ji hua(彭继华) 1, 2., MAO Yong(毛勇) 2. LI Shi qiong(李世琼) 2. SUN Xun fang(孙训方) 2.1. Department of Engineering Mechanics, southwest Jiaotong University, Chengdu 610031, P.R.China 2. Division of Super Alloys, Central Iron and S 西南交通大学四川成都钢铁研究总院北京

The tensile mechanical properties and fracture behaviors of Ti 2.Al 2.Nb 7Ta alloys were studied at room temperature. Three typical microstructures of Ti 2.lNb based alloys were obtained by combination of thermal mechanical processing and heat treat ment. They are: 1) lath mixture of O + B 2.with remaining β grain boundaries and α 2.phase; 2. equiaxed O phase in B 2.matrix; 3) fine lath mixture of O + B 2.without remaining β grain boundaries. It is shown that the microstructure obviously affects the tensile properties of Ti 2.lNb based alloys. The microstructure of fine lath mixture of O + B 2.without remaining β grain boundaries has good combination of yield stress and ductility, while the microstructure with lath mixture of O + B 2.with remaining β grain boundaries and α 2.phase has low yield stress and elongation. The fracture mode was also controlled by the microstructure of Ti 2.lNb based alloys. By means of SEM, it was found that the dominated fracture mode of microstructure with lath mixture of O + B 2.with remained β grain boundary and α 2.phase was intergranular, and the fracture mode of the other two microstructures was mainly transgranular.

关键词： Ti 2.lNb based alloys tensile properties fracture behavior

Origin and controlling factors of chlorite coatings—an example from the reservoir of T_3x Group of the Baojie area,Sichuan Basin,China

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Petroleum Science 2009年第4期6卷 376-382页

作者： Peng Jun1,Liu Jinku2.Wang Yan2.and Liu Jianfeng2.1 Scientific Research Department,southwest Petroleum University,Chengdu,Sichuan 610500,China 2.Graduate School,southwest Petroleum University,Chengdu,Sichuan 610500,China Scientific Research Department Southwest Petroleum University Chengdu Sichuan China Graduate School Southwest Petroleum University Chengdu Sichuan China

The study of the chlorite coatings always attracts scholars in China and other countries because the chlorite coatings play an important role in the preservation of residual primary pores in sandstone *** present,the study of the origin and the controlling factors is relatively *** occurrence,time of formation,genesis,controlling factors,and the mechanism of chlorite coatings inhibiting quartz overgrowths were studied in detail with thin section and SEM *** were from the sandstone reservoirs of the T3x Group in the Baojie area,the transitional zone from the middle to the south of Sichuan *** results indicate that the chlorite coatings on the walls of the pore spaces are oriented perpendicular to grain surfaces in the form of isopachous(even-thickness) grain-coating,while the chlorite coatings at the contacts between adjacent detrital grains are arranged with a preferred orientation tangential to the surface of detrital *** chlorite coatings were formed in the eogenetic *** were formed by recrystallization of Fe-rich clay films during the syndepositional period,and chlorite cements would be recrystallized after the coatings’ *** formation of chlorite coatings was mainly controlled by the depositional environment,provenance conditions,and diagenetic *** presence of chlorite coatings could result in the preservation of primary pores in deeply buried sandstone reservoirs by effectively inhibiting quartz overgrowths and the development of compaction and pressure solution.

关键词： Chlorite coatings occurrence time of formation origin controlling factor quartz overgrowths T3x Group

眉山天府新区人民医院一期（西南医科大学附属天府医院）

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建筑实践 2024年第5期 134-141页

作者： China southwest Architectural Design and Research Institute Co., Ltd. 中国建筑西南设计研究院有限公司

西南医科大学附属天府医院位于四川省天府新区眉山片区,南临环天府新区快速路,东靠益州大道南延线。项目统—规划、整体设计、分期实施,采用“近期850床综合医疗+远期独立专科医学中心”的模式。总图布局设计以院感管控为线索,按照各楼...

西南医科大学附属天府医院位于四川省天府新区眉山片区,南临环天府新区快速路,东靠益州大道南延线。项目统—规划、整体设计、分期实施,采用“近期850床综合医疗+远期独立专科医学中心”的模式。总图布局设计以院感管控为线索,按照各楼栋功能的洁污关系布置后勛区、科研办公区、主要医疗区、传染病区及污物区。

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