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RESEARCH ON HYDRODYNAMIC AND WATER QUALITY MODEL FOR TIDAL RIVER NETWORKS

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Journal of Hydrodynamics 2003年第2期15卷 64-70页

作者： Xu Zu xin, Lu Shi qiang sch.ol of environ.ent Science and eng.neering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China Lab. of Pollution Control Sch. of Environ. Sci. and Eng. Tongji Univ. Shanghai 200092 China

Hydrodynamic and water quality model for tidal river network is set up withMIKE11 modeling system, according to the features of tidal river networks in plain area. The modelwas calibrated using the hydrological and water quality data of 1999, and the results show that thesimulated values agree with the measured data very well. This model is used to numerically analyzethe effects of low flow augmentation on hydrodynamic and water quality conditions of Suzhou *** simulation results show that the flow augmentation can increase net disch.rge of Suzhou Creekand improve its ability of re-aeration; and its concentration of dissolved oxygen in the rivernetworks can also increase correspondingly.

关键词： tidal river network water quality model suzhou creek low flow augmentation

Celebrating the 20th Anniversary of the Department of Chemistry at Renmin University of China

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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES 2024年第5期40卷 761-763页

作者： Wang, Yapei Renmin Univ Sch Chem & Life Resources Beijing 100872 Peoples R China

Established in 2004,the Department of Chemistry was the first entity of the sch.ol of Science at Renmin University of China,marking the inception of a new era in the university's pursuit of scientific *** embarked on its academic mission by admitting its first batch of undergraduate and master's students in the same year,and by 2008,it had leaped forward by enrolling its first doctoral candidates.A decade after its establishment,in 2015,the department began to enter the top 1%of global chemistry disciplines in the ESI rankings,a first for Renmin University of *** 2022,the major of chemistry was awarded as the national first-class undergraduate major construction site.

关键词： batch pursuit undergraduate

Effect of the Design Parameters on the Performance of Inner-Recycling Continuous Sand Filter

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Journal of Donghua University(eng.ish Edition) 2002年第3期19卷 40-44页

作者：陈志强温沁雪吕炳南 sch. of Municipal and environ. eng. Harbin Inst. of Technol. Harbin 150090 China

A novel integrated water treatment facility, inner-recycling continuous sand filter, is discussed. The theory of micro-flocculation is applied in the sand-washing circulation system with continuous filtration and backwashing. The design and operation parameters, which affect the performance of the filter, are discussed. The key design parameters are provided as follows: diameter of filter material is 0.7 to 1.0 mm, depth of filter bed is 0.6 m, filtration velocity is less than 12 m/h, ratio of gas to water is 9:11 and sand recycling rate is 2 to 4 mm/min.

关键词： Internal recycling continuous sand filter, filter design parameters, micro-flocculation, size of filter material,thickness of filter bed, filtering velocity, ratio of gas to water,sand recycling rate.

Performance analysis for underground gas storage reservoir in depleted gas field

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Journal of Harbin Institute of Technology(New Series) 2002年第1期9卷 75-78页

作者：谭羽飞陈家新 sch. of Manicipal and environ. eng. Harbin Inst. of Technol. Harbin 150001 China

The construction of underground natural gas storage is one of the most reasonable and effective ways for basically surmounting city seasonal peak shaving and stabilizing peak waving. Owing to the heterogeneity of geological structure used as underground natural gas storage and different capacities of storing and transmitting fluid in reservoir, it is necessary make a reasonable proration for each member of the injection and production wells within the storage during peak shaving. In this paper, through analyzing the injection production performance characteristics of the underground natural gas storage in depleted gas field, an accurate mathematical model of the underground gas storage of depleted gas field is set up; characteristics of the storage performance and permeating processes were studied,history processes of underground gas storage were stimulated and major influence factors were analyzed. Specific and typical examples from actural data are included to demonstrate the relevance of the method to simulation of storage operation.

关键词： underground gas storage depleted gas field mathematical simulation performance analysis

Electrochemical Behavior of La-doped LiFePO4/C Cathode Materials for Lithium Ion Batteries

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过程工程学报 2015年第3期15卷 511-517页

作者：王山杨海涛张立博许洪亮石丽丽 National Key Lab. Multi-phase Complex Systems Inst. Process Eng. Chinese Academy of Sciences Beijing Key Lab. environ. Sci. & eng. Sch. Chem. Eng. & Environ. Beijing Institute of Technology

Alien atom was used to obtain a series of Li Fe1-xLaxPO4/C(x=0,0.002,0.005,0.01,0.015)cathode materials with the aim of investigating the influence of participation of La on the electrochemical behavior of Li Fe PO4/*** of X-ray diffractometer,scanning electron microscope equipped with energy dispersive spectrometer and high resolution transmission electron microscope was *** results show that all the La-doped Li Fe PO4/C samples are olivine type crystals,La ion is sufficiently introduced into the network,and every element is well homogeneously *** are many pore spaces on the surface of *** content of carbon in the prepared cathode materials remains 13.6%calculated by TGA/DTA curves,and the particles are wrapped by a uniformly and continuous carbon layer with the thickness of about 2 ***,the content of Fe2P also keeps the same basically in all the cathode materials as a result of the similar ratio(2.35)of peak intensity at 36.5o and 37.1o from *** increasing trend is most pronounced at doped 0.005which presents the highest initial disch.rge capacity of 163 mA-h/g,lowest charge transfer resistance of 5.52-,superior diffuse ability of lithium ion(10-11 cm2/s)and the best capacity retention current rate of about 93%after 50 cycles at 0.1 C.

关键词： LiFePO4 cathode material lanthanum doping lithium ion battery

EXPERIMENTAL STUDY ON UPGRADING OF A FINE-SCALED GRAPHITE ORE BY FLOTATION

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Journal of Wuhan University of Technology(Materials Science) 2000年第2期15卷 53-57页

作者：余学斌 Wuhan University of Technology China sch. of Rsrc. and environ. eng. Wuhan University of Technology Wuhan 430070 China

Based on the quality and analysis of the medium carbon product whose grade was 81%-82%, the emphasis of the study was placed on the orthogonal experiments of roughing flotation reagent and single factors, such as abrasive grain, pulp concentration and the rotating speed of flotation machine. The result with improvement in the grade of concentrate to 95% through the routine floatation method was achieved.

关键词： fine-scaled graphite floatation orthogonal experiment

AEROCRETE MADE WITH LOW SILICON TAILINGS OF CHeng.HAO IRON ORE MINE

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Journal of Wuhan University of Technology(Materials Science) 2000年第2期15卷 58-62页

作者：王砚 Wuhan University of Technology China sch. of Rsrc. and environ. eng. Wuhan University of Technology Wuhan 430070 China

The experimental study on the tailings from Cheng.hao Iron Ore Mine has been introduced briefly. By analyzing the chemical and mineral compositions of Chenchao Iron Ore, the technological process has been constituted. According to the comparison experiments, the optimal proportion of cement and lime, dosage of the additional silicon - materials, calcium-silicon proportion, dosage of aluminum powder and other parameters have been decided. Aerocrete has been trial-produced successfully with the low-silicon iron ore tailings. It has opened up a new way for the exploitation of the low-silicon iron ore tailings.

关键词： aerocrete iron tailings recovery

Effects of SrO/Al_2O_3 Molar Ratio on the Luminescent Characteristics of Rare-Earth Strontium Aluminate Phosphors

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Journal of Rare Earths 2002年第4期20卷 322-324页

作者：张玉军尹衍升谭砂砾 Lab. of Liquid Structure Shandong Univ. Jinan 250061 China sch. of environ. Sci. and eng. Shangdong Univ. Jinan 250061 China

The study on the effects of SrO/Al 2O 3 molar ratio on the crystalline phases and photoluminescence characteristics of strontium aluminate phosphors co-activated with Eu 2+ and Dy 3+ were conducted by X-ray powder diffractometry, fluorescence spectrometer and photometer. The strontium aluminate luminescent materials with different SrO/Al 2O 3 molar ratio emit the visible lights with different color tone after removal of excitation. The peak waveleng.hs of the emission spectra drift in the direction of short wave, the quantity of Sr 4Al 14O 25 crystalline phase increases and the afterglow time leng.hens with the SrO/Al 2O 3 reduction. The results show that when the SrO/Al 2O 3 molar ratio is near 1, the photoluminescence materials have high luminescent intensity, and when it is near 0.75, they have long afterglow time. However, when SrO/Al 2O 3 molar ratio is more than 1, the luminescent materials appear strong alkaline in water solution; when SrO/Al 2O 3 molar ratio is much less than 0.75, the samples need a higher temperature to be sintered.

关键词： rare earths luminescence materials strontium aluminate characteristics

Study on Metals Recovery from -0.074 mm Printed Circuit Boards by Enhanced Gravity Separation

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过程工程学报 2006年第2期6卷 201-204页

作者：赵跃民温雪峰施红霞焦红光陶有俊 sch. Chem. eng. & Technol. China Univ. Mining & Technol. Dept. environ. Sci. & eng. Tsinghua Univ. Bid Department China General Technology (Group) Holding Limited

Nowadays study on reutilization of discarded printed circuit boards (PCBs) has great significance for achieving secondary resources recycling and preventing environ.ental pollution. Physical methods show great potential and advantages on discarded PCBs reutilization, compared with chemical and biological methods. However for the particles of 0.074 mm PCBs, little work has been done in the past because of lower separation efficiency and recovery. In this work, the conundrum of 0.074 mm PCBs reutilization was resolved successfully with the help of Falcon concentrator. Separation mechanism for fine particles with different mass densities in a Falcon centrifugal concentrator was analyzed. The main factors such as magnitude of rotation frequency (centrifugal acceleration), anti-charge water pressure and feeding concentration were studied, and interaction of different factors was analyzed using DesignExpert software. The experimental results show that metals grade of 0.074 mm PCBs and integration efficiency were obtained as 76.89% and 80.77% respectively when feeding concentration was 40 g/L with water pressure of 0.01 MPa and rotation frequency of 50 Hz.

关键词：印刷电路板重力分离选矿综合利用