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Characterization of the start-up behavior and steady-state performance of biotrickling filter removing low concentration toluene waste gas

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Science China(Technological Sciences) 2012年第6期55卷 1701-1710页

作者： CHEN Rong LIAO qiang TIAN Xin WANG YongZhong ZHU xun MIAO JunHe Key Laboratory of Low-Grade Energy Utilization Technologies and Systems(Chongqing University) Ministry of EducationChongqing 400030China Institute of Engineering Thermophysics Chongqing UniversityChongqing 400030China

A biotrickling filter packed with the regular ceramic spheres was designed and fabricated to purify the low toluene-concentration waste *** attention was made to the study of the start-up behavior of the biotrickling ***,the steady performances were investigated to establish the experimental correlation between the operation factors and removal *** was found that the start-up process of the biotrickling filter exhibited three stages including the biofilm formation,biofilm development,and biofilm *** OD600 nm of the circulated liquid,gas pressure drop,elimination capacity,and temperature rise maintained at a rather low level in the biofilm formation stage,then increased rapidly in the biofilm development stage,and finally reached a stable value in the biofilm stabilization *** was also found that the removal efficiency of the biotrickling filter in the stable period decreased with increase in the waste gas flow rate,circulated liquid flow rate,and diameter of the ceramic *** interestingly,it was revealed the operation modes have a significant influence on the removal efficiency of the biotrickling filter,and the microorganism show a high activity under the operating temperature ranging from 30°C to 40°*** experimental correlations for describing the effect of operation factors on the removal efficiency of the biotrickling filters under both the co-current and counter-current operation modes were *** correlation results are in good agreement with the experimental data.

关键词： biotrickling filter biofilm start-up process removal efficiency operation mode toluene

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Efficacy and safety of herbal medicines in treating gastric ulcer:A review

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World Journal of Gastroenterology 2014年第45期20卷 17020-17028页

作者： Wei-Ping bi Hui-bin Man Mao-qiang Man Department of Internal Medicine Wendeng Central Hospital Dermatology Service Veterans Affairs Medical Center Department of Dermatology University of California

Gastric ulcer is a common disorder of the digestive *** therapeutic regimens largely rely on Western ***,numerous studies have demonstrated that herbal medicines can effectively treat gastric ulcer in humans and various animal models via divergent *** review updates the efficacy and safety of herbal medicines in treating gastric ulcer,and the mechanisms of their action in humans and animal *** have demonstrated that the efficacy of herbal medicines is comparable or superior to that of drugs such as omeprazole or cimetidine in humans and animal models,and herbal medicines display fewer adverse *** mechanisms by which herbal medicines benefit gastric ulcer include stimulation of mucous cell proliferation,anti-oxidation,and inhibition of gastric acid secretion and H(+)/K(+)-ATPase *** herbal medicines also exhibit antimicrobial *** of herbal medicines could be a valuable alternative to treat gastric ulcer in humans effectively,with few adverse effects.

关键词： Herbal medicines Gastric ulcer Mechanism of action

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Effect of heat treatment on the Nb distribution and corrosion resistance of Zr-Sn-Nb-Fe zirconium alloy

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Rare Metals 2008年第2期27卷 192-196页

作者： LIU Wenqing GENG xun LIU Qingdong LI qiang ZHOU Bangxin YAO Meiyi Instrurnental Analysis ＆ Research Center Shanghai University Shanghai 200444 China

After being treated in different ways, Zr-Sn-Nb-Fe alloy specimens are exposed in 0.01mol/L LiOH aqueous solution at 350℃ under 16.8 MPa. The examination of microstructures and second phase particles （SPPs） of these specimens was carried out by high-resolution transmission electron microscopy （HR-TEM）. The specimens treated at 800℃ before the final cold rolling have a better corrosion resistance than those treated at 680℃, and the specimens treated at 500℃, after the final cold rolling, have a better corrosion resistance than those treated at 560℃. TEM examination shows that the SPPs existing in the 800℃/500℃ specimen, which has the best corrosion resistance, contains a lot of Nb element, which results in the reduction of the niobium content in the α-Zr solid solution.

关键词： zircaloy heat treatment corrosion resistance microstructure second phase particles

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Study on Agrobacterium-Mediated Transformation of Pepper with Barnase and Cre Gene

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Agricultural Sciences in China 2009年第8期8卷 947-955页

作者： LIU Juan-xu YU Yi-xun LEI Jian-jun CHEN Guo-ju CAO bi-hao College of Horticulture South China Agricultural University Guangzhou 510642 P.R. China Mid-Florida Research and Education Center Institute of Food and Agricultural Sciences University of Florida Apopka FL 32703-8504 USA

This study was designed to control plant fertility by cell lethal gene Barnase expressing at specific developmental stage and in specific tissue of male organ under the control of Cre/lox system, for heterosis breeding of chili pepper （Capsicum annuum L.）. Chili pepper inbred lines （A, D, E, and I） were transformed with Cre gene and Barnase gene situated between loxp, separately, by means of Agrobacterium co-culture. In this study, we had established a high transformation system by extensive study of affecting factors including genotype, selection of marker, and lethal dose. Cotyledon with petiole from 9-11-day-old seeding was pre-cultured on media MR[MB（MS mineral＋vitamine B5）＋BA（6-Benzyladenine） 5.0 mg·L^-1 ＋IAA（indoleacetic acid） 1.0 mg·L^-1＋GA3（gibberellic acid） 1.0mg·L^-1＋sucrose 3%＋agar 6.5g·L^-1] for 2d. The explants were infected by Agrobacterium tumefaciens when their OD600（optical density at 600 nm）reached 0.6-0.9. After co-cultured for 4-5 d on media MC [MB＋BA5.0 mg·L^-1＋IAA 1.0 mg·L^-1 ＋GA3 1.0 mg·L^-1＋sucrose 3% ＋agar 6.5 g·L^-1＋AS （acetosyringone） 200μmol·L^-1, these cotyledons with petiole were cultured on selective differentiation medium in the media MT[MB medium supplemented with BA [5.0 mg·L^-1＋ IAA 1.0 mg·L^-1＋ GA3 1.0 mg·L^-1＋ AgNO3 5.0 mg·L^-1＋ CW （coconut water） 5% ＋ Km （kanamycin） 65 mg·L^-1＋ Cb （carbenicillin） 500 mg·L^-1＋ 3% sucrose ＋ agar 6.5 g·L^-1].The Kmr （kanamycin resistant） bud rosettes were elongated on selective elongation medium and rooted on rooting medium. PCR and Southern blotting analysis of Kmr plantlet indicated that the foreign genes had been integrated into the genome of pepper. The transgenic plants with Cre gene developed well, blossomed out, and set fruit normally. The transgenic plants with Barnase gene grew well with normal appearance of flower, but they showed different fertility from complete sterility, partial sterility to complete fertility, and similar results were obtained from in vitro pollen germination experim

关键词： pepper (Capsicum annuum L.) genetic transformation male sterile TA29-Barnase Cre/lox system

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ESTABLISHMENT OF THE OCEAN DYNAMIC SYSTEM WITH FOUR SUB-SYSTEMS AND THE DERIVATION OF THEIR GOVERNING EQUATION SETS

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Journal of Hydrodynamics 2012年第2期24卷 153-168页

作者： YUAN Ye-li QIA0 Fang-li YIN xun-qiang HAN Lei LU Ming The First Institute of Oceanography State Oceanic Administration of ChinaQingdao 266061China

Based on their differences in physical characteristics and time-space scales,the ocean motions have been divided into four types in the present paper：turbulence,wave-like motion,eddy-like motion and *** the three-fold Reynolds averages to the governing equations with Boussinesq approximation,with the averages defined on the former three sub-systems,we derive the governing equation sets of the four sub-systems and refer to their sum as ＂the ocean dynamic system＂.In these equation sets,the interactions among different motions appear in two forms：the first one includes advection transport and shear instability generation of larger scale motions,and the second one is the mixing induced by smaller scale motions in the form of transport flux *** governing equation sets are the basis of analytical/numerical descriptions of various ocean processes.

关键词： ocean dynamic system four sub-systems advection transport shear instability transport flux residue

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Low Root Zone Temperature Limits Nutrient Effects on Cucumber Seedling Growth and Induces Adversity Physiological Response

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Journal of Integrative Agriculture 2013年第8期12卷 1450-1460页

作者： YAN Qiu-yan DUAN Zeng-qiang MAO Jing-dong LI xun DONG Fei State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of Sciences Department of Chemistry and biochemistry Old Dominion University Agricultural Bureau of Xiangfen County Shanxi Province

Effects of root-zone temperatures （RZT）（12℃-RZT and 20℃-RZT） and different N, P, and K nutrient regimes on the growth, reactive oxygen species （ROS）, and antioxidant enzyme in cucumber seedlings were investigated in hydroponics. Strong interactions were observed between RZT and nutrient on the dry weight （P=0.001）, root length （P=0.001） and leaf area （P=0.05）. Plant dry weights were suppressed at low RZT of 12℃, while higher biomass and growth of cucumber seedlings were produced at elevated RZT of 20℃ under each nutrient treatment. Growth indexes （plant height, internode length, root length, and leaf area） at 12℃-RZT had less difference among nutrient treatments, but greater response was obtained for different nutrients at high RZT. RZT had larger effects （P=0.001） on cucumber seedling growth than nutrients. In addition, N was more effective nutrients to plant growth than P and K under low root temperature to plant growth. Higher hydrogen peroxide （H202）, malondialdehyde （MDA）, soluble sugar （SS） contents in leaves were observed at 12℃-RZT in all nutrient treatments than those at 20℃-RZT, indicating the chilling adversity damaged to plant growth. In general, antioxidant enzyme had larger response under low root-zone temperature. Superoxide dismutase （SOD） activities were higher in both leaves and roots while peroxidase （POD） and catalase （CAT） showed large different action in leaves and roots at both the two root-zone temperature.

关键词： Cucumis sativus L. growth indexes antioxidant enzyme reactive oxygen

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Small World Effects in a Harmonious Unifying Hybrid Preferential Model Networks

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Communications in Theoretical Physics 2007年第2X期48卷 377-383页

作者： FANG Jin-Qing bi Qiao LI Yong LU Xin-biao LIU qiang China Institute of Atomic Energy P.O. Box 275-81 Beijing 102413 China

Small worm effects in the harmonious unifying hybrid preferential model （HUHPM） networks are studied both numerically and analytically. The idea and method of the HUHPM is applied to three typical examples of unweighted BA model, weighted BBV model, and the TDE rnodel, so-called HUHPM-BA, HUHPM-BBV and HUHPM- TDE networks. Comparing the HUHPM with current typical models above, it is found that the HUHPM networks has the smallest average path length and the biggest average clustering coefficient. The results demonstrate that the HUHPM is more suitable not only for the un-iveighted models but also for the weighted models.

关键词： harmonious unifying hybrid preferential model small world effect network science

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An analytical study on turbulence with mixed-flow model and two-phase model

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International Journal of Sediment Research 2012年第2期27卷 235-239页

作者： Dan-xun LI Marian MUSTE qiang ZHONG Xing-kui WANG State Key Laboratory of Hydroscience and Engineering Tsinghua University IIHR-Hydroscience and Engineering University of Iowa

Suspended sediment is carried by turbulent water flows in *** sediment-laden flow analysis treats the suspension as a mixed liquid,and recent two-phase flow model enables separate velocity measurement of the two coupling phases.A simplified theoretical analysis was presented to discuss the differences between the two models in reporting turbulence intensity in experimental *** turbulence intensity of the mixture is lower than the weighted average of those of the two phases in mixed-flow *** mixture’s turbulence intensity becomes higher than the average of the two phases in two-phase experiments due to the presence of velocity *** same set of data may lead to either an underestimation or an overestimation of actual turbulence levels when different models are used.

关键词： Sediment-laden flows Two-phase flow Turbulence Velocity

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Cross-Language Transfer Learning-based Lhasa-Tibetan Speech Recognition

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Computers, Materials & Continua 2022年第10期73卷 629-639页

作者： Zhijie Wang Yue Zhao Licheng Wu Xiaojun bi Zhuoma Dawa qiang Ji School of Information Engineering Minzu University of ChinaBeijing100081China School of Chinese Ethnic Minority Languages and Literatures Minzu University of ChinaBeijing100081China Department of Electrical Computerand Systems EngineeringRensselaer Polytechnic InstituteTroyNY 12180-3590USA

As one of Chinese minority languages,Tibetan speech recognition technology was not researched upon as extensively as Chinese and English were until ***,along with the relatively small Tibetan corpus,has resulted in an unsatisfying performance of Tibetan speech recognition based on an end-to-end *** paper aims to achieve an accurate Tibetan speech recognition using a small amount of Tibetan training *** demonstrate effective methods of Tibetan end-to-end speech recognition via cross-language transfer learning from three aspects:modeling unit selection,transfer learning method,and source language *** results show that the Chinese-Tibetan multi-language learning method using multilanguage character set as the modeling unit yields the best performance on Tibetan Character Error Rate(CER)at 27.3%,which is reduced by 26.1%compared to the language-specific *** our method also achieves the 2.2%higher accuracy using less amount of data compared with the method using Tibetan multi-dialect transfer learning under the same model structure and data set.

关键词： Cross-language transfer learning low-resource language modeling unit Tibetan speech recognition

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PtCu subnanoclusters epitaxial on octahedral PtCu/Pt skin matrix as ultrahigh stable cathode electrocatalysts for room-temperature hydrogen fuel cells

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Nano Research 2023年第2期16卷 2252-2258页

作者： Fengling Zhao Lirong Zheng qiang Yuan Qinghua Zhang Tian Sheng Xiaotong Yang Lin Gu xun Wang State-Local Joint Laboratory for Comprehensive Utilization of biomass Center for R&D of Fine ChemicalsCollege of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Key Lab of Organic Optoelectronics&Molecular Engineering Tsinghua UniversityBeijing 100084China College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241000China Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics Beijing 100190China

Achieving stable surface structures of metal catalysts is an extreme challenge for obtaining long-term durability and meeting industrial application *** report a new class of metal catalyst,Pt-rich PtCu heteroatom subnanoclusters epitaxially grown on an octahedral PtCu alloy/Pt skin matrix(PtCu1.60),for the oxygen reduction reaction(ORR)in an acid *** PtCu1.60/C exhibits an 8.9-fold enhanced mass activity(1.42 A·mgPt^(−1))over that of commercial Pt/C(0.16 A·mgPt^(−1)).The PtCu1.60/C exhibits 140,000 cycles durability without activity decline and surface PtCu cluster stability owing to unique structure derived from the matrix and epitaxial growth pattern,which effectively prevents the agglomeration of clusters and loss of near-surface active *** characterization and theoretical calculations confirm that Pt-rich PtCu clusters favor ORR activity and thermodynamic *** room-temperature polymer electrolyte membrane fuel cells,the PtCu1.60/C shows enhanced performance and delivers a power density of 154.1/318.8 mW·cm^(−2)and 100 h/50 h durability without current density decay in an air/O_(2)feedstock.

关键词： epitaxial growth core–shell nanostructure PtCu alloy oxygen reduction reaction hydrogen fuel cells

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