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| 1 | 多普勒雷达资料对中尺度系统短期预报的改进显示文摘文中给了一种由单多普勒雷达资料反演风矢量场的变分方法 ,并由此形成预报初始场。运用美国风暴分析预报中心 ( CAPS)的改进的区域系统模式对移经美国俄克拉何马州的一个强雷暴系统进行了数值预报试验 ,结果表明 ,初始场中引入多普勒雷达观测资料后明显地改进了预报。 | 邱崇践 余金香 QinXu | 2000 | 气象学报2000，58，2： | 64 |
| 2 | Comparative study of the net exchange of CO_(2) in 3 types of vegetation ecosystems on the Qinghai-Tibetan Plateau显示文摘Using the eddy covariance method,from 1 July2003 to 30 June 2004, we conducted the observation andanalysis of ecosystem CO2 flux in 3 types of alpine meadowvegetation (Kobresia humilis, Potentilla fruticosa shrub andKobresia tibetica swamp meadows) on the Qinghai-TibetanPlateau. The results show that the Kobresia humilis meadow,the shrub meadow and the swamp meadow’s highest CO2uptake rates are 16.78, 10.42 and 16.57 μmol·m?2·s?1respectively, while their highest CO2 release rates are 8.22,7.73 and 18.67 μmol·m?2·s?1 respectively. The Kobresiahumilis meadow and shrub meadow’s annual atmosphericuptakes are 282 g CO2/m2 and 53 g CO2/m2, respectively,while swamp meadow’s annual atmospheric release is 478 gCO2/m2. This proves that the Kobresia humilis meadow andthe shrub meadow on the Qinghai-Tibetan Plateau haverelatively low potential for CO2 uptake and release comparedto C4 grasslands, a number of lowland grasslands, andforests. Moreover, swamp meadow has relatively high releasepotential. This, in turn, reveals clear differences in carbonsource/sink between different types of vegetation in theQinghai-Tibetan Plateau alpine meadow ecosystem. Thesedifferences are mainly brought by differences in thevegetations’ photosynthetic capacity and soil respiration. | ZHAO Liang LI Yingnian ZHAO Xinquan XU Shixiao TANG Yanhong YU Guirui GU Song DU Mingyuan WANG Qinxue | 2005 | Chinese Science Bulletin2005，50，16： | 34 |
| 3 | Nondestructive Testing and Characterization of Residual Stress Field Using an Ultrasonic Method显示文摘To address the difficulty in testing and calibrating the stress gradient in the depth direction of mechanical components, a new technology of nondestructive testing and characterization of the residual stress gradient field by ultrasonic method is proposed based on acoustoelasticity theory. By carrying out theoretical analysis, the sensitivity coefficients of different types of ultrasonic are obtained by taking the low carbon steel(12%C) as a research object. By fixing the interval distance between sending and receiving transducers, the mathematical expressions of the change of stress and the variation of time are established. To design one sending-one receiving and oblique incidence ultrasonic detection probes, according to Snell law, the critically refracted longitudinal wave(LCR wave) is excited at a certain depth of the fixed distance of the tested components. Then, the relationship between the depth of LCR wave detection and the center frequency of the probe in Q235 steel is obtained through experimental study. To detect the stress gradient in the depth direction, a stress gradient LCR wave detection model is established, through which the stress gradient formula is derived by the relationship between center frequency and detecting depth. A C-shaped stress specimen of Q235 steel is designed to conduct stress loading tests, and the stress is measured with the five group probes at different center frequencies. The accuracy of ultrasonic testing is verified by X-ray stress analyzer. The stress value of each specific depth is calculated using the stress gradient formula. Accordingly, the ultrasonic characterization of residual stress field is realized. Characterization results show that the stress gradient distribution is consistent with the simulation in ANSYS. The new technology can be widely applied in the detection of the residual stress gradient field caused by mechanical processing, such as welding and shot peening. | SONG Wentao XU Chunguang PAN Qinxue SONG Jianfeng | 2016 | Chinese Journal of Mechanical Engineering2016，29，2： | 27 |
| 4 | Bulking sludge for PHA production:Energy saving and comparative storage capacity with well-settled sludge显示文摘Two acetate-fed sequencing batch reactors(SBR) were operated under an aerobic dynamic feeding(ADF) model(SBR #2) and with anaerobic phase before aerobic phase(SBR #1) to select mixed cultures with a high polyhydroxyalkanoates(PHA) storage response.Although kinetic selection based on storage response should bring about a predominance of floc-formers,a bulking sludge with storage response comparable to well-settled sludge was steadily established.An anaerobic phase was introduced before the aerobic phase in the ADF model to improve the sludge settleability(SBR #1),however,due to the consequent increased feast/famine ratio,the performance of SBR #1,in terms of both the maximum PHB(polyhydroxybutyrate) cell content and PHB,was lower than that of SBR #2.SBR #2 gradually reached a steady state while SBR #1 failed suddenly after 50 days of operation.The maximum specific substrate uptake rate and storage rate for the selected bulking sludge were 0.4 Cmol Ac/(Cmol X·hr) and 0.18 Cmol Ac/(Cmol PHB·hr),respectively,resulting a yield of 0.45 Cmol PHB/(Cmol Ac) in SBR #2 in the culture enrichment phase.A maximum PHB content of 53% of total suspended solids and PHB storage rate of 1.36 Cmol Ac/(Cmol PHB·hr) was achieved at 10.2 hr in batch accumulation tests under nitrogen starvation.The results indicated that it was feasible to utilize filamentous bacteria to accumulate PHA with a rate comparable to well-settled sludge.Furthermore,the lower dissolved oxygen demand of filamentous bacteria would save energy required for aeration in the culture enrichment stage. | Qinxue Wen Zhiqiang Chen Changyong Wang Nanqi Ren | 2012 | Journal of Environmental Sciences2012，24，10： | 15 |
| 5 | Effect of aeration rate on composting of penicillin mycelial dreg显示文摘Pilot scale experiments with forced aeration were conducted to estimate effects of aeration rates on the performance of composting penicillin mycelial dreg using sewage sludge as inoculation. Three aeration rates of 0.15, 0.50 and 0.90 L/(min·kg) organic matter(OM) were examined. The principal physicochemical parameters were monitored during the 32 day composting period. Results showed that the higher aeration rate of 0.90 L/(min·kg) did not corresponded to a longer thermophilic duration and higher rates of OM degradation;but the lower aeration rate of 0.15 L/(min·kg) did induce an accumulation of NH+4-N contents due to the inhibition of nitrification. On the other hand, aeration rate has little effect on degradation of penicillin. The results show that the longest phase of thermophilic temperatures ≥ 55°C, the maximum NO-3-N content and seed germination, and the minimum C/N ratio were obtained with 0.50 L/(min·kg) OM. Therefore, aeration rates of0.50 L/(min·kg) OM can be recommended for composting penicillin mycelial dreg. | Zhiqiang Chen Shihua Zhang Qinxue Wen Jun Zheng | 2015 | Journal of Environmental Sciences2015，27，11： | 13 |
| 6 | Characterizing CO_2 fluxes for growing and non-growing seasons in a shrub ecosystem on the Qinghai-Tibet Plateau显示文摘To assess carbon budget for shrub ecosystems on the Qinghai-Tibet Plateau, CO2flux was measured with an open-path eddy covariance system for an alpine shrub ecosystem during growing and non-growing seasons. CO2 flux dynamics was distinct between the two seasons. During the growing season from May to September, the ecosystem exhibited net CO2uptake from 08:00 to 19:00 (Beijing Standard Time), but net CO2 emission from 19:00 to 08:00.Maximum CO2 uptake appeared around 12:00 with values of 0.71, 1.19, 1.46 and 0.67 g CO2m-2 h-1 for June, July, August and September, respectively. Diurnal fluctuation of CO2 flux showed higher correlation with photosynthetic photon flux density than temperature. The maximum net CO2 influx occurred in August with a value of 247 g CO2 m-2. The total CO2 uptake by the ecosystem was up to 583 g CO2 m-2 for the growing season. During the non-growing season from January to April and from October to December, CO2 flux showed small fluctuation with the largest net CO2 efflux of 0.30 g CO2 m-2 h-1 in April. The diurnal CO2 flux was close to zero during most time of the day, but showed a small net CO2 efflux from 11:00 to 18:00. Diurnal CO2 flux, is significantly correlated to diurnal temperature in the non-growing season. The maximum monthly net CO2 efflux appeared in April, with a value of 105 g CO2 m-2. The total net CO2 efflux for the whole non-growing season was 356 g CO2 m-2. | XU Shixiao, ZHAO Xinquan, FU Yuling, ZHAO Liang, LI Yingnian, CAO Guangmin, GU Song, WANG Qinxue & DU Mingyuan Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Graduate School of the Chinese Academy of Sciences, Beijing 100136, China National Institute for Environmental Studies, Tsukuba 305-8569, Japan National Institute for Agro-Environmental Science, Tsukuba 305-8604, Japan | 2005 | Science China Earth Sciences2005，48，z1： | 12 |
| 7 | Spatial heterogeneity of soil chemical properties between Haloxylon persicum and Haloxylon ammodendron populations显示文摘Spatial heterogeneity is a ubiquitous feature in natural ecosystems, especially in arid regions. Different species and their discontinuous distribution, accompanied by varied topographic characteristics, result in soil resources distributed differently in different locations, and present significant spatial heterogeneity in desert ecosystems. In this study, conventional and geostatistical methods were used to identify the heterogeneity of soil chemical properties in two desert populations, Haloxylon persicum Bunge ex Boss., which dominates on the slopes and tops of sand dunes and Haloxylon ammodendron (C. A. Mey.) Bunge, which inhabits interdunes in the Gurbantunggut Desert of Xinjiang, China. The results showed that soil pH, electrical conductivity (EC), soil organic carbon (SOC), available nitrogen (AN) and available phosphorus (AP) were significantly higher in H. ammodendron populations than that in H. persicum. The coefficient of variation (CV) indicated that (1) most parameters presented a moderate degree of variability (10% < CV < 100%) except pH in both plots, (2) the variability of soil pH, EC and AP in H. ammodendron populations was higher than that in H. persicum populations, and (3) SOC and AN in H. ammodendron populations were lower than that in H. persicum populations. Geostatistical analysis revealed a strong spatial dependence (C0/(C0+C) < 25%) within the distance of ranges for all tested parameters in both plots. The Kriging-interpolated figures showed that the soil spatial distribution was correlated with the vegetation distribution, individual size of plants, and the topographic features, especially with the plants nearest to sampling points and the topographic features. In each plot, soil EC, SOC, AN and AP presented similar distributions, and fertile islands and salt islands occurred in both plots but did not affect every individual plant, since the sampling distance was larger than the size of such fertile islands. The results of topographic effects on soil heterogeneity suggested significant differences between the interdunes and dune-tops. Different topographic characteristics (physical factors) between plots result in the differences in SOC, AN and AP, while the heterogeneity of soil pH and EC arise from plant species and their distribution (biotic factor). Such biotic and physical factors did not occur in isolation, but worked together on soil heterogeneity, and played important parts in improving the soil properties. Hence these factors were ecologically valuable in the highly resource-stressed arid study area. | Li, CongJuan Li, Yan Ma, Jian Fan, LianLian Wang, QinXue | 2010 | Journal of Arid Land2010，2，4： | 11 |
| 8 | Effect of homogenization treatment on microstructure evolution and the distributions of RE and Zr elements in various MgeLieREeZr alloys显示文摘Mge3Lie0.4Zr alloys containing RE elements(Gd,La,Nd)(Mge3LieREe0.4Zr alloys)are investigated to reveal the influence of homogenization treatment on microstructures and distributions of RE,Zr elements.It is found that 300C24 h homogenization treatment shows better improvement on the microstructure including the refinement of grain size,the dispersion of cellular dendrite and low melting point particles.Before treatment,La and Nd segregate effectively at grain boundary and Zr segregates in the form of precipitates.Homogenization treatment induces the reduction of RE segregation.However,the segregation of Zr in precipitates cannot be abated due to the relatively low diffusion rate compared with RE elements. | Lei Bao Qichi Le Zhiqiang Zhang Jianzhong Cui Qinxue Li | 2013 | Journal of Magnesium and Alloys2013，1，2： | 10 |
| 9 | Effects of phosphorus and nitrogen limitation on PHA production in activated sludge显示文摘The effects of phosphorus and nitrogen limitation on polyhydroxyalkanoate(PHA) production and accumulation by activated sludge biomass with acetate as a carbon source were investigated.Pre-selected influent carbon-phosphorus(C:P,W/W) of 100,160,250,500 and 750,and carbon-nitrogen(C:N,W/W) of 20,60,100,125 and 180 were applied in the phosphorus limitation experiments and the nitrogen limitation experiments,respectively.The maximum PHA accumulation up to 59%of the cell dry weight with a PHA productivity of 1.61 mg PHA/mg COD consumed was observed at the C:N 125 in the nitrogen limitation experiment.This value was much higher than that obtained in previous studies with a normal substrate feeding.The study showed that activated sludge biomass would produce more polyhydroxybutyrate than polyhydroxyvalerate under the stress of nutrient limitation,especially under phosphorus limitation conditions.The experimental result also indicated that both phosphorus and nitrogen limitation may cause sludge bulking. | Qinxue Wen,Zhiqiang Chen,Ting Tian,Wei Chen State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China | 2010 | Journal of Environmental Sciences2010，22，10： | 9 |
| 10 | The involvement of wheat U-box E3 ubiquitin ligase TaPUB1 in salt stress tolerance显示文摘U-box E3 ubiquitin ligases play important roles in the ubiquitin/26 S proteasome machinery and in abiotic stress responses. Ta PUB1-overexpressing wheat(Triticum aestivum L.) were generated to evaluate its function in salt tolerance. These plants had more salt stress tolerance during seedling and flowering stages, whereas the Ta PUB1-RNA interference(RNAi)-mediated knock-down transgenic wheat showed more salt stress sensitivity than the wild type(WT). Ta PUB1 overexpression upregulated the expression of genes related to ion channels and increased the net root Na+efflux, but decreased the net K+efflux and H+influx, thereby maintaining a low cytosolic Na+/K+ratio, compared with the WT. However,RNAi-mediated knock-down plants showed the opposite response to salt stress. Ta PUB1 could induce the expression of some genes that improved the antioxidant capacity of plants under salt stress. Ta PUB1 also interacted with Ta MP(Triticum aestivum α-mannosidase protein), a regulator playing an important role in salt response in yeast and in plants. Thus, low cytosolic Na+/K+ratios and better antioxidant enzyme activities could be maintained in wheat with overexpression of Ta PUB1 under salt stress. Therefore, we conclude that the U-box E3 ubiquitin ligase Ta PUB1 positively regulates salt stress tolerance in wheat. | Wenlong Wang Wenqiang Wang Yunzhen Wu Qinxue Li Guangqiang Zhang Ruirui Shi Junjiao Yang Yong Wang Wei Wang | 2020 | Journal of Integrative Plant Biology2020，62，5： | 6 |
| 11 | Automatic Method for Synchronizing Workpiece Frames in Twin-robot Nondestructive Testing System显示文摘The workpiece frames relative to each robot base frame should be known in advance for the proper operation of twin-robot nondestructive testing system. However, when two robots are separated from the workpieces, the twin robots cannot reach the same point to complete the process of workpiece frame positioning. Thus, a new method is proposed to solve the problem of coincidence between workpiece frames. Transformation between two robot base frames is initiated by measuring the coordinate values of three non-collinear calibration points. The relationship between the workpiece frame and that of the slave robot base frame is then determined according to the known transformation of two robot base frames, as well as the relationship between the workpiece frame and that of the master robot base frame. Only one robot is required to actually measure the coordinate values of the calibration points on the workpiece. This requirement is beneficial when one of the robots cannot reach and measure the calibration points. The coordinate values of the calibration points are derived by driving the robot hand to the points and recording the values of top center point(TCP) coordinates. The translation and rotation matrices relate either the two robot base frames or the workpiece and master robot. The coordinated are solved using the measured values of the calibration points according to the Cartesian transformation principle. An optimal method is developed based on exponential mapping of Lie algebra to ensure that the rotation matrix is orthogonal. Experimental results show that this method involves fewer steps, offers significant advantages in terms of operation and time-saving. A method used to synchronize workpiece frames in twin-robot system automatically is presented. | LU Zongxing XU Chunguang PAN Qinxue MENG Fanwu LI Xinliang | 2015 | Chinese Journal of Mechanical Engineering2015，28，4： | 6 |
| 12 | Spatial and Temporal Changes of Floating Population in China Between 1990 and 2000显示文摘By studying the county-level census data of 1990 and 2000, we analyzed the spatial and temporal changes in the floating population in China between 1990 and 2000. The results of the analysis revealed the following characteris- tics. First, the spatial distribution of the migrants (referred to as 'floaters' in this paper) became increasingly concentrated in the cities during the 1990s. Second, the number of floaters increased rapidly during this period, and the area in which the floaters settled expanded quickly into four population explosion belts: the coast, the Changjiang River Delta, the Beijing-Guangzhou Railway and national border belts. Third, the number of inter-province floaters increased rapidly and exceeded that of intra-province floaters in the 1990s. In addition, to obtain a quantitative relationship between the number of floaters and 10 socio-economic variables by using statistical methods and also to find the chiefly important pulling factors of the migration destination, the authors selected approximately 100 cities with the largest population of floaters. Consequently, we found that four factors-GDP, passenger trips per 10,000 persons, per capita GDP and foreign direct investment-could provide an explanation for 83.7% of the number of floaters in 2000. The GDP showed the highest correlation with the number of floaters, suggesting that a highly developed economy is the most important factor that attracts floaters. Furthermore, a fairly close relationship between the number of floaters and the GDP was also found in 2000 for all the counties. | LIU Chen Kuninori OTSUBO WANG Qinxue Toshiaki ICHINOSE Sadao ISHIMURA | 2007 | Chinese Geographical Science2007，17，2： | 5 |
| 13 | Estimation of soil respiration in a paddy ecosystem in the subtropical region of China显示文摘Water vapor, energy exchange, and CO2 flux were measured continuously from 2003 to 2005 using the eddy covariance technique in a paddy ecosystem in the subtropical region of China. The CO2 fluxes at nighttime during fallow periods (from middle October to late April) were used to analyze the dynamics of soil respiration and its relationship with soil temperature, and to simulate the annual dynamics of soil respiration in paddy ecosystems. The variation of soil respiration showed a clear seasonal pattern. The soil respiration rates at night during the fallow periods were 52―398 mg·m-2·h-1, and exponen- tially correlated (P<0.001) with soil temperatures at different depths of soil (5, 10, and 20 cm), particularly the temperature measured at a depth of 5 cm. Based on the simulated exponential equations developed, annual average soil respiration rates and total soil respiration of paddy soil in the subtropical region of China were estimated to be 178.5―259.9 mg·m-2·h-1 and 1.56―2.28 kg·m-2·a-1, respectively. The simulation equations can be applied to evaluating soil respiration in paddy ecosystems during the rice-growing season. | REN XiuE WANG QinXue TONG ChengLi WU JinShui WANG KeLin ZHU YongLi LIN ZeJian WATANABE Masataka TANG GuoYong | 2007 | Chinese Science Bulletin2007，52，19： | 3 |
| 14 | Reconstruction of measurements in state estimation strategy against deception attacks for cyber physical systems显示文摘没有已知的州的方程,新州的评价策略被设计对为电子的恶意的攻击是物理系统。由数据重建的想法启发了,(CS ) 压缩察觉到基于系统状态的 Markov 图在察觉和鉴定计划以后被用于剩余大小的重建,它对欺骗攻击增加州的评价策略的跳回。首先, observability 分析被介绍从攻击决定测量重建和损坏水平的被触发的时间。特别地,学习的字典被建议由 K 单个的值分解(K-SVD ) 形成过去完成的字典,它根据测量数据的特征适应地被生产。由于剩余大小的不规则,另外,一个采样矩阵作为测量矩阵被设计。最后,模拟实验在 6 公共汽车力量系统上被执行。大小的重建被建议重建方法完成很好的结果表演,和相应效果分别地基于联合字典和传统的高斯或 Bernoulli 随机的矩阵比重建计划好。特别,当仅仅 29% 可得到的干净大小是左的时,建议策略的性能仍然是非凡的,它为五种恢复算法反映概论。 | Qinxue LI Bugong XU Shanbin LI Yonggui LIU Delong CUI | 2018 | Control Theory and Technology2018，16，1： | 3 |
| 15 | Efficient purification of Al_(30) by organic complexation method显示文摘A method was developed for preparing high purity Al30O8(OH)56(H2O)_(24)^(18)+(Al30) through elimination of impurities by complexation.Polyaluminum chloride II(PAC_(30))with Al_(c )content of 75%was adopted as the source of Al_(30).The PAC_(30)was prepared under conditions of total aluminum concentration 0.1 mol/L and OH^-/Al ratio 2.2 to obtain the highest content of Al_(30).A precipitation/metathesis method,organic solvent precipitation method and organic complexation method were examined to separate and purify Al_(30).It was found that only by the organic complexation method could high purity Al_(30)products be obtained in large yield economically.In the experiments,benzoic acid was used as the coordinating reagent to decompose the main impurity AlO_4Al_(12)(OH)_(24)(H_2O)_(12)^(7+)(Al_(13)),and the Al_(30)product could be obtained by precipitation and metathesis operations.It was noteworthy that the decomposition of impurities by benzoic acid could be completed in 2 hr.The Al_(30)product was characterized by Ferron assay,^(27)Al-NMR,SEM,XRD and TGA.The results showed that the purity of the Al_(30)product could exceed 92%. | Libing Liu Qinxue Yang Pin Wang Feng Xiao Ruyuan Jiao Guangyu An Dongsheng Wang | 2019 | Journal of Environmental Sciences2019，31，6： | 2 |
| 16 | Efficient algorithm for 3D bimodulus structures显示文摘The bimodulus material is a classical model to describe the elastic behavior of materials with tension-compression asymmetry.Due to the inherently nonlinear properties of bimodular materials,traditional iteration methods suffer from low convergence efficiency and poor adaptability for large-scale structures in engineering.In this paper,a novel 3D algorithm is established by complementing the three shear moduli of the constitutive equation in principal stress coordinates.In contrast to the existing 3D shear modulus constructed based on experience,in this paper the shear modulus is derived theoretically through a limit process.Then,a theoretically self-consistent complemented algorithm is established and implemented in ABAQUS via UMAT;its good stability and convergence efficiency are verified by using benchmark examples.Numerical analysis shows that the calculation error for bimodulus structures using the traditional linear elastic theory is large,which is not in line with reality. | Qinxue Pan Jianlong Zheng Pihua Wen | 2020 | Acta Mechanica Sinica2020，36，1： | 2 |
| 17 | Mesophilic and thermophilic anaerobic digestion of swine manure with sulfamethoxazole and norfloxacin:Dynamics of microbial communities and evolution of resistance genes显示文摘The role of norfloxacin(NOR)and sulfamethoxazole(SMX)in mesophilic and thermophilic anaerobic digestion(AD)of pig manure,with respect to methane production and variations in the microbial community and resistance genes,including antibiotic resistance genes(ARGs),class I integrase(intIl),and heavy metal resistance genes(MRGs),was investigated.The results indicated that NOR exerted little influence on the microbial community,whereas SMX negatively affected the acetoclastic methanogens.The abundance of two sulfonamide resistance genes(sul1 and sul2),three quinolone resistance genes(qnrS,parC,and aac(6′)-Ib-cr),and intI1 decreased by 2–3 orders of magnitude at the end of thermophilic AD.In contrast,mesophilic AD was generally ineffective in reducing the abundance of resistance genes.According to the results of redundancy analysis,the abundance of ARGs was affected primarily by microbial community dynamics(68.5%),rather than the selective pressure due to antibiotic addition(13.3%).Horizontal gene transfer(HGT)through intI1 contributed to 26.4%of the ARG variation.The archaeal community also influenced the changes in the resistance genes,and ARG reduction was significantly correlated with enhanced methane production.Thermophilic AD presented a higher methane production potential and greater reduction in resistance gene abundance. | Qinxue Wen Shuo Yang Zhiqiang Chen | 2021 | Frontiers of Environmental Science & Engineering2021，15，5： | 2 |
| 18 | Effects of sludge retention time,carbon and initial biomass concentrations on selection process:From activated sludge to polyhydroxyalkanoate accumulating cultures显示文摘Four sequence batch reactors(SBRs) fed by fermented sugar cane wastewater were continuously operated under the aerobic dynamic feeding(ADF) mode with different configurations of sludge retention time(SRT), carbon and initial biomass concentrations to enrich polyhydroxyalkanoate(PHA) accumulating mixed microbial cultures(MMCs) from municipal activated sludge.The stability of SBRs was investigated besides the enrichment performance. The microbial community structures of the enriched MMCs were analyzed using terminal restriction fragment length polymorphism(T-RFLP). The optimum operating conditions for the enrichment process were: SRT of 5 days, carbon concentration of 2.52 g COD/L and initial biomass concentration of3.65 g/L. The best enrichment performance in terms of both operating stability and PHA storage ability of enriched cultures(with the maximum PHA content and PHA storage yield(YPHA/S) of61.26% and 0.68 mg COD/mg COD, respectively) was achieved under this condition. Effects of the SRT, carbon concentration and initial biomass concentration on the PHA accumulating MMCs selection process were discussed respectively. A new model including the segmentation of the enrichment process and the effects of SRT on each phase was proposed. | Zhiqiang Chen Long Huang Qinxue Wen Huichao Zhang Zirui Guo | 2017 | Journal of Environmental Sciences2017，29，2： | 2 |
| 19 | Reconsideration on the effect of nitrogen on mixed culture polyhydroxyaIkanoate production toward high organic loading enrichment history显示文摘In most of the operating strategies for mixed microbial cultures polyhydroxyalkanoate (PHA) production, moderate organic loads and low nitrogen concentrations are used, however, the real waste streams contain variable concentrations of carbon and nitrogen. To evaluate the effect of enrichment history on PHA producer and production the various carbon and nitrogen levels were utilized during the accumulation phase. Different operating strategies were applied in three sequencing batch reactors (SBRs) subjected to aerobic dynamic feeding. The maximum PHA production of the enriched cultures under nutrient excess, limitation and starvation (Cmol/Nmol ratio of & 40 and oo, respectively) was evaluated in batch assays. A higher PHA content and biomass growth were achieved in the nutrients presence in comparison to the nutrient starvation condition. The cultures from the SBR treated under short sludge retention time, high organic loading rate, short cycle length (SBR#3) and nutrient excess reached the maximum PHA content (54.9%) and biomass increase (38.9%). Under nutrient limitation, the negative biomass growth was observed under nutrient starvation because of the sampling loss. The succession of microbial communities in SBRs and batch assays was analyzed using terminal restriction fragment length polymorphism. The SBR#3 had the best overall PHA production performance considering its high PHA content and productivity in all nutrient content, it indicates that nitrogen has a substantial impact on PHA yield especially when high organic loading rate enrichment history is involved. | Zhiqiang Chen Lizhi Zhao Ye Ji Qinxue Wen Long Huang | 2019 | Frontiers of Environmental Science & Engineering2019，13，4： | 2 |
| 20 | Nonlinear Oscillations of Semigeostrophic Eady Waves in the Presence of Diffusivity显示文摘Analyses are performed to examine the physical processes involved in nonlinear oscillations of Eady baroclinic waves obtained from viscous semigeostrophic models with two types of boundary conditions (freeslip and non-slip). By comparing with previous studies for the case of the free-slip boundary condition, it is shown that the nonlinear oscillations are produced mainly by the interaction between the baroclinic wave and zonal-mean state (total zonal-mean flow velocity and buoyancy stratification) but the timescale of the nonlinear oscillations is largely controlled by the diffusivity. When the boundary condition is non-slip, the nonlinear oscillations are further damped and slowed by the diffusive process. Since the free-slip (non-slip)boundary condition is the zero drag (infinite drag) limit of the more realistic drag boundary condition,the nonlinear oscillations obtained with the two types of boundary conditions are two extremes for more realistic nonlinear oscillations. | QinXU WeiGU 高守亭 | 2005 | Advances in Atmospheric Sciences2005，22，1： | 1 |
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