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1Effect of Cultivation on Spatial Distribution of Nematode Trophic Groups in Black Soil显示文摘Geostatistics combined with GIS was applied to assess the spatial distribution of nematode trophic groups following two contrasting soil uses in the black soil region of Northeast China. Two plots, one with fallow for 12 years and the other cultivated, were marked on regular square grids with 2-m spacing. Soil samples were collected from each sampling point, nematodes were extracted from these samples and classified into four trophic groups: bacterivores, fungivores, plant parasites, and omnivores/predators. The numbers of total nematodes and trophic groups analyzed had normal distributions on both fallow and cultivated plots. The absolute abundances of total nematodes and trophic groups were observed to be much more homogeneous on cultivated plot than on fallow one. Geostatistical analysis showed that the densities of total nematodes and trophic groups on both fallow and cultivated plots exhibited spatial dependence at the sampled scale and their experimental semivariograms were adjusted to a spherical or exponential model, except those of bacterivores and fungivores on cultivated plot. The spatial distribution of nematode trophic groups was found to be different for the two land uses, indicating that cultivation changed the native condition for soil nematode activities.LIANG WENJU, LI QI, JIANG YONG, CHEN WENBO and WEN DAZHONGShenyang Experimental Station of Ecology, Institute of Applied Ecology, the Chinese Academy of Sciences, Shenyang 110016 (China) 2003Pedosphere2003,13,2:29
2Effects of relative humidity and PM2.5 chemical compositions on visibility impairment in Chengdu, China显示文摘To better understand the potential causes of visibility impairment in autumn and winter in Chengdu,relative humidity(RH),visibility,the concentrations of PM2.5 and its chemical components were on-line measured continuously in Chengdu from Nov.2016 to Jan.2017.Six obvious haze episodes occurred in Chengdu,with the total time of haze episodes accounted for more than 90%of the total observation period,and higher NO2 concentrations and RH were related to the high particle concentrations in haze episodes.The visibility decreased in a non-linear tendency under different RH conditions with the increase of PM2.5 concentrations,which was more sensitive to RH under lower PM2.5 concentrations.The threshold concentration of PM2.5 got more smaller with the increase of RH.During the entire observation period,organic matter(OM)was the largest contributor(31.12%to extinction coefficient(bext)),followed by NH4NO3 and(NH4)2SO4 with 28.03%and 23.01%,respectively.However,with the visibility impairment from Type I(visibility>10 km)to Type IV(visibility≤2 km),the contribution of OM to bextdecreased from 38.12%to 26.77%,while the contribution of NH4NO3 and(NH4)2SO4 to bextincreased from 19.09%and 20.20%to 34.29%and 24.35%,respectively,and NH4NO3 became the largest contributor to bextat Type IV.The results showed that OM and NH4NO3 were the key components of PM2.5 for visibility impairment in Chengdu,indicating that the control of precursors emissions of carbonaceous species and NH4NO3 could effectively improve the visibility in Chengdu.Fan Liu Qinwen Tan Xia Jiang Fumo Yang Wenju Jiang 2019Journal of Environmental Sciences2019,31,12:21
3Toxicities and risk assessment of heavy metals in sediments of Taihu Lake, China, based on sediment quality guidelines显示文摘The occurrence, toxicities, and ecological risks of five heavy metals(Pb, Cu, Cd, Zn and Ni) in the sediment of Taihu Lake were investigated in this study. To evaluate the toxicities caused by the heavy metals, the toxicities induced by organic contaminants and ammonia in the sediments were screened out with activated carbon and zeolite. The toxicities of heavy metals in sediments were tested with benthic invertebrates(tubificid and chironomid).The correlations between toxicity of sediment and the sediment quality guidelines(SQGs)derived previously were evaluated. There were significant correlations(p < 0.0001) between the observed toxicities and the total risk quotients of the heavy metals based on SQGs,indicating that threshold effect level(TEL) and probable effect level(PEL) were reliable to predict the toxicities of heavy metals in the sediments of Taihu Lake. By contrast, the method based on acid volatile sulfides(AVS) and simultaneously extracted metals(SEM),such as ∑SEM/AVS and ∑SEM-AVS, did not show correlations with the toxicities. Moreover,the predictive ability of SQGs was confirmed by a total predicting accuracy of 77%. Ecological risk assessment based on TELs and PELs showed that the contaminations of Pb, Cu, Cd and Zn in the sediments of Taihu Lake were at relatively low or medium levels. The risks caused by heavy metals in the sediments of northern bay of the lake, which received more wastewater discharge from upper stream, were higher than other area of the lake.Yanfeng Zhang Yuwei Han Jinxi Yang Lingyan Zhu Wenjue Zhong 2017Journal of Environmental Sciences2017,29,12:16
4Spatial heterogeneity of DTPA-extractable zinc in cultivated soils induced by city pollution and land use显示文摘The spatial heterogeneity of DTPA-extractable zinc in the cultivated soils of Shenyang suburbs in Liaoning Province of China was investigated, and its map was drawn by the methods of geostatistics combined with geographic information system. The data of soil DTPA-extractable zinc fitted normal distribution after logarithm transformation, and its semivariogram fitted a spherical model. The semivariogram indicated that the spatial dependence of soil DTPA-extractable zinc content was moderate, with the spatial dependence range of 1.69 km and the fractal dimension of 1.96. Stochastic factors contributed to 49.9% of the spatial variability, while structural factors contributed to 50.1% of it. The spatial heterogeneity of soil DTPA-extractable zinc shown by a kriged interpolation map was deeply influenced by stochastic factors such as city pollution, land use pattern and crop distributions. For example, the average content of Zn in vegetable garden soils was 2.5-4 times as much as in their originated soils, and was lower in paddy soils than in their originated soils. The areas with a higher content of soil DTPA-extractable zinc appeared in the near suburbs and the riverside along Hunhe River and the wastewater drainage of Xihe River, and the extremely high values in the near suburb of the city's residential area were a striking feature, indicating the key role of city pollution in the spatial heterogeneity of soil DTPA-extractable zinc. When recorded in the form of a soil pollution map,the results of such a survey make it possible to identify the unusually polluted areas, and to provide more information for precise agriculture and environmental control.JIANG Yong, LIANG Wenju, WEN Dazhong, ZHANG Yuge & CHEN Wenbo Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Shenyang Experimental Station of Ecology, Chinese Academy of Sciences, Shenyang 110016, China College of Land and Environment, Shenyang Agricultural University, Shenyang 110161, China 2005Science China(Life Sciences)2005,48,z1:13
5Depletion of activated hepatic stellate cell correlates with severe liver damage and abnormal liver regeneration in acetaminophen-induced liver injury显示文摘肝的星形的房间(HSC ) 是为肝的祖先房间(HPC ) 和 hepatocytes 的本地干细胞壁龛的重要部分。然而,它至于激活的 HSC 的产品是否被要求稀释 hepatocyte 损害是不清楚的,提高肝新生,或两个。在这研究,我们由弄空执行了功能研究的损失有 gliotoxin 的激活的 HSC。显著地严重的肝损坏和拒绝的幸存率与激活的 HSC 的弄空被相关,这被表明。而且,减少 HSC 激活导致了增殖的 hepatocytes 的数字的 hepatocyte apoptosis 和 66% 减少的 3 褶层增加。这被戏剧的减少在知道在 hepatocyte 复制期间起来调整的五基因的表示层次伴随。特别地,激活的 HSC 的弄空禁止了被 Pank 积极的房间的减少的数字在道和降低的基因表示 cytokeratin 铺平的门附近证实的卵形的房间反应,这被发现 19 (CK19 ) 在对待 gliotoxin 的肝。这些数据提供激活的 HSC 涉及 hepatocyte 死亡和 hepatocytes 的增长,在 acetaminophen (APAP ) 的 HPC 导致了尖锐的肝损害的清楚的证据。Kuntang Shen Wenju Chang Xiaodong Gao Hongshan Wang Weixin Niu Lujun Song Xinyu Qin 2011Acta Biochimica et Biophysica Sinica2011,43,4:13
6Effects of heavy metal pollution of highway origin on soil nematode guilds in North Shenyang, China显示文摘Soil samples were collected with distance at 5,20,40,80,160,and 320 m from the Shen-Ha(Shenyang-Harbin) Highway,Northeast China,to investigate the effect of heavy metals of highway origin on soil nematode guilds.The contents of soil Pb,Cu,Zn,and the nematode community structure were analyzed.The results showed that the contents of total and available Pb,Cu,Zn varied significantly with the different distances from the highway.Pb was the main pollutant in the soils in the vicinity of Shen-Ha Highway.The zone from 20 to 40 m away from the highway was the most polluted area.The highest abundance of soil nematodes was found at 5 m while the lowest at 20 m away from the highway.Thirty six genera of nematodes belonging to 23 families were identified.Nematode guilds having different responses to soil heavy metals were classified into four types.Soil nematode guilds may act as a prominent indicator to heavy metal pollution of highway origin.HAN Dechang ZHANG Xiaoke TOMAR Vijay Vikram Singh LI Qi WEN Dazhong LIANG Wenju 2009Journal of Environmental Sciences2009,21,2:10
7Low-temperature selective catalytic reduction of NO_(x) with NH_(3) over zeolite catalysts:A review显示文摘The selective catalytic reduction(SCR)of NO_(x) by NH3 is one of the most mature technologies for NO_(x) treatment.Catalysts are the main factors affecting denitrification efficiency.Zeolites as low-tempe rature NH3-SCR catalysts have been extensively studied in the past few years.In this work,the mechanism of zeolites for NH3-SCR reaction was reviewed and the denitrification performances of zeolite catalysts prepared by different methods were compared.The effects of sulfur and water poisoning on zeolite catalysts in NH3-SCR reaction were also analyzed.Several ways to address the problems in lowtemperature NH3-SCR reaction were discussed.Hopefully,this review could provide a fundamental understanding of SCR reaction on zeolite catalysts and pave the way toward similar studies to realize its commercial applications.Yijuan Pu Xinyu Xie Wenju Jiang Lin Yang Xia Jiang Lu Yao 2020Chinese Chemical Letters2020,31,10:9
8Robust Dataset Classification Approach Based on Neighbor Searching and Kernel Fuzzy C-Means显示文摘Dataset classification is an essential fundament of computational intelligence in cyber-physical systems(CPS).Due to the complexity of CPS dataset classification and the uncertainty of clustering number,this paper focuses on clarifying the dynamic behavior of acceleration dataset which is achieved from micro electro mechanical systems(MEMS)and complex image segmentation.To reduce the impact of parameters uncertainties with dataset classification,a novel robust dataset classification approach is proposed based on neighbor searching and kernel fuzzy c-means(NSKFCM)methods.Some optimized strategies,including neighbor searching,controlling clustering shape and adaptive distance kernel function,are employed to solve the issues of number of clusters,the stability and consistency of classification,respectively.Numerical experiments finally demonstrate the feasibility and robustness of the proposed method.Li Liu Aolei Yang Wenju Zhou Xiaofeng Zhang Minrui Fei Xiaowei Tu 2015IEEE/CAA Journal of Automatica Sinica2015,2,3:7
9Auditory filter based broadband MUSIC algorithm for sound source localization显示文摘Based on the analysis of the shortcomings of broadband MUSIC algorithm with short-time Fourier transform(SF-MUSIC) for sound source localization,a broadband MUSIC algorithm with auditory filter(AF-MUSIC) was proposed.The proposed algorithm first employs auditory filter bank to decompose the signals received on the microphone array,and then locates the sound source with MUSIC algorithm over every frequency channel.At last,by combining with the subinterval frequency estimation,the final localization result is gained.Evaluations on the proposed algorithm prove that comparing with the SF-MUSIC algorithm,the AF-MUSIC algorithm decreases the average error of the estimation results with 2.5479 degree in different source conditions.The accuracy of sound source DOA estimation is enhanced effectively.LIAO Fengchai LI Peng LIU Wenju 2013Chinese Journal of Acoustics2013,32,4:7
10Sulfur resource recovery based on electrolytic manganese residue calcination and manganese oxide ore desulfurization for the clean production of electrolytic manganese显示文摘An environmentally friendly and resource-conserving route to the clean production of electrolytic manganese was developed,in which the electrolytic manganese residue(EMR)was initially calcined for cement buffering;then the generated SO2-containing flue gas was managed using manganese oxide ore and anolyte(MOOA)desulfurization;at last,the desulfurized slurry was introduced to the electrolytic manganese production(EMP).Results showed that 4.0 wt%coke addition reduced the sulfur of calcined EMR to 0.9%,thereby satisfying the cement-buffer requirement.Pilot-scale desulfurization showed that about 7.5 vol%of high SO2 containing flue gas can be cleaned to less than 0.1 vol%through a five-stage countercurrent MOOA desulfurization.The desulfurized slurry had 42.44 g·L-Mn2+and 1.92 g·L-1 S2 O62-,which was suitable for electrowinning after purification,and the purity of manganese product was 99.93%,satisfy the National Standard of China YB/T051-2015.This new integrated technology fulfilled 99.7%of sulfur reutilization from the EMR and 94.1%was effectively used to the EMP.The MOOA desulfurization linked the EMP a closed cycle without any pollutant discharge,which promoted the cleaner production of EMP industry.Dong Sun Lin Yang Ning Liu Wenju Jiang Xia Jiang Jianjun Li Zhengyou Yang Zhengping Song 2020Chinese Journal of Chemical Engineering2020,28,3:7
11SWOT-AHP hybrid model for vehicle lubricants from CNPCLC,China显示文摘In recent years,owing to the strong increase in demand for lubricants,China is ranked second in the global lubricant market.With the rapid development of China's automobile industry,there is an increasing demand for vehicle lubricants and an increasing requirement for higher quality lubricants.While the demands for vehicle lubricants are increasing year by year in China,the quality grade of vehicle lubricant will be improved by leaps and bounds,and the high standard lubricant for automobile will be directly brought in line with international practice.At present,the market share of most high-end vehicle lubricant has been occupied by foreign lubricant brands.So for China National Petroleum Corporation Lubricant Company(CNPCLC),the urgent issue is that strategies must be made to respond to the stern challenges and to occupy more market share.In this paper,by using the analytic hierarchy process(AHP) technique that has the advantage of combining quantitative with qualitative analysis,a SWOT-AHP model for CNPCLC vehicle lubricants is developed,presenting a good tool for studying the competitive factors domestic and overseas for vehicle lubricants.Finally a strategic plan for CNPCLC vehicle lubricants is suggested.Jiang Qingzhe XuYanming Xin Wenju Song Zhaozheng Song Qianqian Ke Ming 2012Petroleum Science2012,9,4:6
12Construction and Count of 1-Resilient Rotation Symmetric Boolean Functions on 4p Variables显示文摘This paper studies the properties of orbit matrix and gives a formula to compute the number of these orbit matrices on 4p variables, where p is an odd prime. It has been demonstrated that the construction of 1-resilient Rotation symmetric Boolean functions(RSBFs) on 4p variables is equivalent to solving an equation system. By the proposed method, all 1-resilient RSBFs on 12 variables can be constructed. We present a counting formula for the total number of all 1-resilient RSBFs on 4p variables. As application of our method, some 1-resilient RSBFs on 12 variables are presented.PANG Shanqi XU Wenju DU Jiao WANG Ying 2017Chinese Journal of Electronics2017,26,6:6
13Effects of slow-release urea fertilizers on urease activity, microbial biomass, and nematode communities in an aquic brown soil显示文摘A field experiment was carried out at the Shenyang Experimental Station of Ecology (CAS) in order to study the effects of slow-release urea fertilizers high polymer-coated urea (SRU1), SRU1 mixed with dicyandiamide DCD (SRU2), and SRU1 mixed with calcium carbide CaC2 (SRU3) on urease activity, microbial biomass C and N, and nematode communities in an aquic brown soil during the maize growth period. The results demonstrated that the application of slow-release urea fertilizers inhibits soil urease activity and increases the soil NH4+-N content.Soil available N increment could promote its immobilization by microorganisms. Determination of soil microbial biomass N indicated that a combined application of coated urea and nitrification inhibitors increased the soil active N pool. The population of predators/omnivores indicated that treatment with SRU2 could provide enough soil NH4+-N to promote maize growth and increased the food resource for the soil fauna compared with the other treatments.JIAO Xiaoguang, LIANG Wenju, CHEN Lijun, ZHANG Haijun, LI Qi, WANG Peng & WEN Dazhong Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Shenyang Experimental Station of Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Graduate School of Chinese Academy of Sciences, Beijing 100039, China 2005Science China(Life Sciences)2005,48,z1:5
14LEO navigation augmentation constellation design with the multi-objective optimization approaches显示文摘Low Earth Orbit(LEO)satellite for navigation augmentation applications can significantly reduce the precise positioning convergence time and attract increasing attention recently.A few LEO Navigation Augmentation(LEO-NA)constellations have been proposed,while corresponding constellation design methodologies have not been systematically studied.The LEO-NA constellation generally consists of a huge number of LEO satellites and it strives for multiple optimization purposes.It is essentially different from the communication constellation or earth observing constellation design problem.In this study,we modeled the LEO-NA constellation design problem as a multi-objective optimization problem and solve this problem with the MultiObjective Particle Swarm Optimization(MOPSO)algorithm.Three objectives are used to strive for the best tradeoff between the augmentation performance and deployment efficiency,namely the Position Dilution of Precision(PDOP),visible LEO satellites and the orbit altitude.A fuzzy set approach is used to select the final constellation from a set of Pareto optimal solutions given by the MOPSO algorithm.To evaluate the performance of the optimized constellation,we tested two constellations with 144 and 288 satellites and each constellation has three optimization schemes:the polar constellation,the single-layer constellation and the two-layer constellation.The results indicate that the optimized two-layer constellation achieves the best global coverage and is followed by the single-layer constellation.The MOPSO algorithm can help to improve the constellation design and is suitable for solving the LEO-NA constellation design problem.Yi HAN Lei WANG Wenju FU Haitao ZHOU Tao LI Beizhen XU Ruizhi CHEN 2021Chinese Journal of Aeronautics2021,34,4:5
15Analysis of interprovincial trade embodied carbon emissions in Beijing-Tianjin-Hebei and surrounding provinces: based on constructed MRIO Model显示文摘The interprovincial trade embodied carbon emissions plays an important role in the national emission reduction target among China's provinces. Furthermore, it will affect the smooth start-up of the national carbon trade market as well as the implementation of targets in 2030 for dealing with the climate change. Based on constructed MRIO model, this paper analyzes the embodied carbon emission trade flows among Beijing, Tianjin, Hebei and surrounding regions such as Shanxi, Shaanxi, and Inner Mongolia. The results indicate that six provinces have formed different patterns of carbon trade balance, where Beijing, Tianjin, and Hebei provinces are in a deficit position, while the other three provinces are in a surplus position.Beijing, Tianjin, and Hebei have transferred part of the carbon emissions to the other three provinces, which shows greater heterogeneity among various provinces and provincial different sectors. On basis of the conclusions, this paper puts forward some suggestions on provincial decomposition, responsibility distribution, and provincial collaborative reduction for national emission reduction targets.Jianhui Cong Qingyan Liu Jidong Kang Wenju Li Xiaopei Wang Man Li 2017Chinese Journal of Population,Resources and Environment2017,15,1:4
16Geniposide, the component of the Chinese herbal formula Tongluojiunao, protects amyloid-β peptide(1–42)-mediated death of hippocampal neurons via the non-classical estrogen signaling pathway显示文摘Tongluojiunao(TLJN) is an herbal medicine consisting of two main components, geniposide and ginsenoside Rg1. TLJN has been shown to protect primary cultured hippocampal neurons. However, its mechanism of action remains unclear. In the present study, primary cultured hippocampal neurons treated with Aβ1–42(10 μmol/L) significantly increased the release of lactate dehydrogenase, which was markedly reduced by TLJN(2 μL/mL), specifically by the component geniposide(26 μmol/L), but not ginsenoside Rg1(2.5 μmol/L). The estrogen receptor inhibitor, ICI182780(1 μmol/L), did not block TLJN- or geniposide-mediated decrease of lactate dehydrogenase under Aβ1–42-exposed conditions. However, the phosphatidyl inositol 3-kinase or mitogen-activated protein kinase pathway inhibitor, LY294002(50 μmol/L) or U0126(10 μmol/L), respectively blo cked the decrease of lactate dehydrogenase mediated by TLJN or geniposide. Therefore, these results suggest that the non-classical estrogen pathway(i.e., phosphatidyl inositol 3-kinase or mitogen-activated protein kinase) is involved in the neuroprotective effect of TLJN, specifically its component, geniposide, against Aβ1–42-mediated cell death in primary cultured hippocampal neurons.Jiao Li Feng Wang Haimin Ding Chunyan Jin Jinyan Chen Yanan Zhao Xiaojing Li Wenju Chen Ping Sun Yan Tan Qi Zhang Xu Wang Angran Fan Qian Hua 2014Neural Regeneration Research2014,9,5:3
17Rice metabolic regulatory network spanning the entire life cycle显示文摘As one of the most important crops in the world,rice(Oryza sativa)is a model plant for metabolome research.Although many studies have focused on the analysis of specific tissues,the changes in metab-olite abundance across the entire life cycle have not yet been determined.In this study,combining both tar-geted and nontargeted metabolite profiling methods,a total of 825 annotated metabolites were quantified in rice samples from different tissues covering the entire life cycle.The contents of metabolites in different tissues of rice were significantly different,with various metabolites accumulating in the plumule and radicle during seed germination.Combining these data with transcriptome data obtained from the same time period,we constructed the Rice Metabolic Regulation Network.The metabolites and co-expressed genes were further divided into 12 clusters according to their accumulation patterns,with members within each cluster displaying a uniform and clear pattern of abundance across development.Using this dataset,we established a comprehensive metabolic profile of the rice life cycle and used two independent strategies to identify novel transcription factors-namely the use of known regulatory genes as bait to screen for new networks underlying lignin metabolism and the unbiased identification of new glycerophospholipid metabolism regulators on the basis of tissue specificity.This study thus demonstrates how guilt-by-association analysis of metabolome and transcriptome data spanning the entire life cycle in cereal crops provides novel resources and tools to aid in understanding the mechanisms underlying important agro-nomic traits.Chenkun Yang Shuangqian Shen Shen Zhou Yufei Li Yuyuan Mao Junjie Zhou Yuheng Shi Longxu An Qianqian Zhou Wenju Peng Yuanyuan Lyu Xuemei Liu Wei Chen Shouchuang Wang Lianghuan Qu Xianqing Liu Alisdair R.Fernie Jie Luo 2022Molecular Plant2022,15,2:3
18Organic amendment effects on nematode distribution within aggregate fractions in agricultural soils显示文摘To evaluate the effect of organic amendments on soil nematode community composition and diversity within aggregate fractions,a study was initiated in agricultural soils with four-year organic amendments.Soil samples were collected from the plow layer(0-20 cm)under three cornfield management scenarios:1)conventional cropping(CK,corn straw removal and no organic manure application);2)straw retention(SR,incorporation of chopped corn stalk);and 3)manure application(MA,chicken manure input).The soil samples were fractionated into four aggregate sizes,i.e.,>2 mm(large macroaggregates),1-2 mm(macroaggregates),0.25-1 mm(small macroaggregates),and<0.25 mm(microaggregates,silt and clay fractions).The composition and diversity of soil nematode communities were determined within each aggregate fraction.The results showed that both SR and MA treatments significantly increased the percentage of macroaggregates(>1 mm)and only MA treatment strongly increased the mean weight diameter compared to the CK(P<0.05).The abundance of total nematodes and four trophic groups were affected significantly by the aggregate fractions and their higher abundance occurred in the larger aggregates.The effects of aggregate size on most nematode genera were significant.Bacterivores in the small macroaggregates and microaggregates,and fungivores in the large macroaggregates were significantly different among treatments.The percentage of bacterivores increased after the application of organic materials,while that of fungivores decreased.It can be concluded that organic management significantly affects soil aggregation and soil characteristics within aggregates,and the aggregate size subsequently influences the distribution of nematode communities.Xiaoke Zhang Xia Wu Shixiu Zhang Yuehua Xing Wenju Liang 2019Soil Ecology Letters2019,1,3:3
19Entanglement transfer from two-mode squeezed vacuum light to spatially separated mechanical oscillators via dissipative optomechanical coupling显示文摘In this paper, we propose a scheme to generate an entangled state between two spatially separated movable mirrors by injecting the two-mode squeezed optical reservoir to the dissipative optomechanics, in which the movable mirrors can modulate the linewidth of the cavity modes. When the coupling between the mirrors and the corresponding cavity modes is weak, the two driven cavity fields can respectively behave as the squeezed-vacuum reservoir for the two movable mirrors by utilizing the effect of completely destructive interference of quantum noise. Thus the mechanical modes are prepared in a two-mode squeezed vacuum state. Moreover,when the coupling between the two mirrors and the cavities modes is strong, the entanglement between the two movable mirrors decreases because photonic excitation can preclude the completely destructive interference of quantum noise, but the movable mirrors are still entangled.YAN Yan GU WenJu LI GaoXiang 2015Science China(Physics,Mechanics & Astronomy)2015,58,5:3
20Factors affecting potassium fixation in seven soils under 15-year long-term fertilization显示文摘Potassium (K) fixation by seven soils, including black soil, fluvo-aquic soil, grey desert soil, loess soil, paddy soil, red soil and purple soil, was determined by laboratory simulation under a fifteen-year-period of long-term fertilization. Factors affecting soil K fixation were then discussed by factor analysis and stepwise regression. Magnitude of soil K fixation rate was as follows: the black soil > the purple soil > the loess soil > the fluvo-aquic soil > the paddy soil > the grey desert soil > the red soil. Our results showed that soil K fixation capacity was significantly affected by the clay mineral types in the soils. Potassium fixation capacity of soils, whose 2:1 layer silicates were dominant minerals, was af- fected by two components extracted by the method of principal component analysis: the first including soil available K, slow available K and K+ saturation, and the second including cation exchange capacity (CEC), soil organic matter (SOM) and <0.002 mm clay contents. Potassium fixation rate was mainly affected by K+ saturation and CEC with lower added K concentration (from 0.4 to 1.6 g/L), and by K+ saturation and <0.002 mm clay content with higher added K concentration (from 2.4 to 4.0 g/L).ZHANG HuiMin XU MingGang ZHANG WenJu HE XinHua 2009Chinese Science Bulletin2009,54,10:3
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