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HJ-1C SAR Image Simulation Based on Geometrical and Radiometric Characters
基于几何特性和辐射特性的HJ-1C星SAR图像模拟

CHEN Quan~,<br>,李震,
遥感学报 , 2006,
Abstract: 中国自主研制的环境减灾小卫星星座中的雷达卫星(HJ-1C),频率设计在S波段,采用VV极化方式,入射角范围是25°—47°。根据HJ-1C的轨道参数和雷达传感器的系统参数,利用高精度的DEM数据(30m),结合地物分类数据(20m),综合考虑几何模型和辐射模型,模拟了该雷达卫星上的SAR图像。HJ-1C星SAR图像的模拟,使在该卫星发射前,能对数据产品有一个初步的认识,并可在雷达系统的设计和验证、图像的解译和新算法的测试等多个方面得到应用。
Effects of arsenic addition in soil on soybean growth and the content of nitrogen, phosphorus and potassium in soybean plant
土壤添加亚砷酸钠对大豆生长和植株氮、磷、钾含量的影响

YANG Lanfang,PENG Xiaolan,PEI Yanyan,CHEN Ruixue,<br>杨,,裴艳艳,瑞雪
环境科学学报 , 2011,
Abstract: Arsenic (As) is toxic to plants and animals. A soil pot experiment with the arsenic addition levels of 0, 5.0, 10.0, 30.0, 50.0, 100.0 mg kg-1 was conducted to investigate the effects of soil arsenic addition on soybean growth and the content of nitrogen, phosphorus and potassium. The results showed that when soil arsenic addition was at a level of 50 mg kg-1, soybean demonstrated a series of toxic symptoms with crimple and dark green leaves, withered leaf edge, dwarfing plant and delayed maturation. The plant heights of soybean decreased with increase of soil arsenic supplement and there was significant negative, exponential correlation between the soil arsenic additions and plant heights of soybean. Soil arsenic addition of 100 mg kg-1 caused 41.5% decrease in plant height, 43.4% in total biomass and 56.1% in the yield of soybean grain. The ratio of root biomass to that of aerial parts and biomass of leaf and stem to that of aerial parts increased, while the ratio of grain biomass to that of leaf and stem, aerial parts and total biomass was decreased. These results meant that high soil arsenic addition suppressed the growth of aerial parts and grain. Soil arsenic pollution had significant effects on the content of nitrogen, phosphorus and potassium in soybean. When soil arsenic addition was 100 mg kg-1, compared to control (no arsenic addition), soybean nitrogen and phosphorus content in grains, roots and leaves and stems, potassium content in leaves and stems and in roots increased significantly, but the potassium content in grains decreased significantly, while the ratio of nitrogen, phosphorus and potassium content in soybean grains to that in leaves and stems and to that in roots decreased significantly. These implied that arsenic stress suppressed the translocation of the nitrogen, phosphorus and potassium in leaves and stems to grains. In summary, over 50.0 mg kg-1 soil arsenic addition could be toxic to soybean growth, but soybean could adapt to the arsenic polluted environment by adjusting the content of nitrogen, phosphorus and potassium in various parts. The essence of arsenic toxicity to soybean growth was to inhibit the growth of soybean aerial parts and the formation of soybean grains because of the suppression of the translocation of nitrogen, phosphorus and potassium in roots, leaves and stems to grains.
Judgment of Learning and Its Accuracy
学习判断及其准确性

Chen Gongxiang,Fu Xiaolan,<br>功香,
心理科学进展 , 2004,
Abstract: As an important metacognitive judgment, Judgment of learning (JOL) is the prediction about the future performance of learned materials. Its mechanism and accuracy are the key issues in the study of judgment of learning. Researchers have advanced many theories to illuminate these two issues from different perspectives. Koriat?cue-utilization framework summarized the previous findings and provided a significant advance in understanding how people make judgment of learning. However, Koriat?framework also faces new challenges. The limitations of the previous studies and the suggestions for future research are also put forward.
EFFECTS OF INTRINSIC AND EXTRINSIC CUES ON JUDGMENT OF LEARNING
内外部线索对学习判断的影响

Chen Gongxiang,Fu Xiaolan,<br>功香,
心理学报 , 2003,
Abstract: Aiming at the difference between Koriat' s and Dunlosky' s outcomes, two experiments were conducted to further explore the effects of intrinsic and extrinsic cues on judgment of learning (JOL). Ss were 63 undergraduates in Shandong Normal University, China. The intrinsic cue was relatedness, and the two extrinsic cues were presentation time and presentation order. The major findings were as follows: Relatedness exerted similar effects on both JOL and recall in the two experiments. The presentation time and the presentation order may be two different types of extrinsic cues. There are different interactions among the different intrinsic cues and extrinsic cues. JOL magnitude was higher when unrelated items were presented first than when related items were presented first in Experiment 2. This suggests that anchoring effects may influence JOL.
Simultaneous Determination of Amino Acids in Food by Capillary Electrophoresis with Indirect Ultraviolet Detection
高效毛细管电泳间接紫外吸收检测法测定食品中的氨基酸

CHEN Bing,LI Xiaoge,HE Ping,XIANG Xiaolan,<br>,,何萍,
色谱 , 2004,
Abstract: The characteristic of capillary electrophoresis (CE) with indirect ultraviolet (UV) detection of L-ornithine (Orn), L-proline (Pro) and L-glutamine (Gln) was investigated. A suitable electrolyte consists of 5 mmol/L sodium p-aminobenzene sulfonic acid-10mmol/L KH_2PO_4 ( pH 11.5) with UV detection at 254 nm. The applied voltage was set at 12 kV. The three amino acids were completely separated and detected by the method in 11 min. The relative standard deviations (RSD) of the method were better than 0.72% for migration time and 2.0% for peak height. The detection limits of Orn, Pro and Gln were 6.78, 8.71 and 7.86 mg/L, respcetively. The proposed method was successfully applied to the determination of amino acids in foods (Haitian soybean sauce, Tsingtao beer and amino acids tonic) and the recoveries were in the range of 96.8%-104%.
Photo-conductivity decay properties of Fe-doped congruent lithium niobate crystals
掺铁铌酸锂晶体的光电导衰减特性研究

Chen Xiao-Lan,Zhang Yun,Ran Qi-Yi,<br>,张耘,冉启义
物理学报 , 2013,
Abstract: 利用电化学分析仪对掺铁同成分铌酸锂晶体进行瞬态光电导研究. 以不同掺铁浓度铌酸锂晶体为样品, 在不同强度的纳秒级脉冲光照射下对光电导的研究发现: 铌酸锂晶体的瞬态光电导是由较为复杂的电子迁移过程形成, 其衰减可以用一个指数函数叠加一个扩展指数来拟合. 拟合参数与光强、掺铁浓度存在以下依赖关系: 入射光强增强时, 幅值σ1max、σ2max、时间常数τ2和扩展因子β 值增大, 在光强增大到一定时, τ2和β出现饱和; 晶体的掺铁浓度升高时, σ1max、σ2max、τ2 值增大, 而β值减小. 根据实验结果, 从理论上提出了光电子导带迁移伴随光电子在小极化子上跳跃迁移的复合电荷传输模型. 该模型较好地解释了掺铁同成分铌酸锂晶体的光电导的衰减特点.
The Study of Estimating Soil Moisture Using ERS Wind Scatterometer
用ERS风散射计数据估算土壤水分方法的研究

CHEN Quan,LI Zhen,WANG Lei,WEI Xiao-lan,<br>,李震,王磊,
遥感学报 , 2007,
Abstract: The ERS-1/2(European Remote-Sensing Satellites-1/2) wind scatterometer(WSC) has a resolution cell of 50 Km,but it covers more than 80% of the Earth surface in four days and can make measurements at multiple incidence angles.In this paper,the method to estimate soil moisture is studied using WSC data.Firstly,based on classical GOM model,the high correlation between WSC data and soil moisture is proved,by comparing in-situ-based precipitation and soil moisture with derived Fresnel reflectivity at normal incidence(which is very closely related to soil moisture) at two points(Amdo and Naqu).This part of work is performed using Database of Global C-Band Radarbackscatter,which is derived from original WSC measurements.Secondly,a simplified algorithm is proposed to estimate soil moisture based on "Water-Cloud" model and AIEM model,the validation is performed using both in-situ-based soil moisture and Basist Wetness Index(BWI),showing that the algorithm can estimate Spatio-temporal soil moisture distribution effectively.
mall RNA in rice genome
Small RNA in rice genome

Wang Kai Zhu Xiaopeng Zhong Lan,Chen Runsheng,<br>王凯,,,润生
中国科学C辑(英文版) , 2002,
Abstract: Rice has many characteristics of a model plant. The recent completion of the draft of the rice genome represents an important advance in our knowledge of plant biology and also has an important contribution to the understanding of general genomic evolution. Besides the rice genome finishing map, the next urgent step for rice researchers is to annotate the genes and non-coding functional sequences. The recent work shows that noncoding RNAs (ncRNAs) play significant roles in biological systems. We have explored all the known small RNAs (a kind of ncRNA) within rice genome and other six species sequences, including Arabidopsis, maize, yeast, worm, mouse and pig. As a result we find 160 out of 552 small RNAs (sRNAs) in database have ho-mologs in 108 rice scaffolds, and almost all of them (99.41 %) locate in intron regions of rice by gene predication. 19 sRNAs only appear in rice. More importantly, we find two special U14 sRNAs: one is located in a set of sRNA ZMU14SNR9(s) which only appears in three plants, 86% sequences of them can be compared as the same sequence in rice, Arabidopsis and maize; the other conserved sRNA XLHS7CU14 has a segment which appears in almost all these species from plants to animals. All these results indicate that sRNA do not have evident borderline between plants and animals.
Determination of Theanine in Tea by Reversed-Phase High Performance Liquid Chromatography
高效液相色谱法测定茶叶中的茶氨酸

ZHU Xiaolan,CHEN Bo,LUO Xubiao,YAO Shouzhuo,<br>朱,,罗旭彪,姚守拙
色谱 , 2003,
Abstract: High performance liquid chromatography (HPLC) coupled wiht electro-spray ioniza tion mass spectrometry (ESI-MS) was used for the determination and identificat ion of theanine in tea without derivatization. A reversed-phase HPLC method was developed and the effects of the mobile phase composition on separation were investigated. Theanine can be separated completely from other components on a Sp herigel C 18 column with trifluoroacetic acid solution (pH 3 0) as mobile phase. The UV detection wavelength was set at 203 nm. The limit of detection wa s down to 1 75 ng. The method is simple and accurate.
Effects of Dopant Nano TiO2 on Vegetal Physiology of Blue-green Algae
改性纳米TiO2 对蓝藻的生理生态影响

Lijuan Zhou,Xiaolan Chen,Guobin Deng,Yanyan Wang,Wei Liu,Shanna Chen,<br>周丽娟,,邓国宾,王炎炎,刘微,善娜
植物学报 , 2008,
Abstract: Synechocystis sp. PCC6803 and Microcystis aeruginosa were treated with the dopant nano TiO2 components 1% Ag,5% Fe2O3, 10% ZnO, and nano TiO2 alone under natural illumination and fluorescent conditions . We determined the content of chlorophyll a, carotenoids, extracellular O2 -. and superoxide dismutase activity in samples. The natural illumination condition was more effective than the fluorescent condition in the photocatalysis of nanometer material. The dopant nano materials were more effective than nano material alone in inhibiting growth of blue-green algae, 1% Ag having the best inhibitory effect. M. aeruginosa has a stronger ability to adapt to superoxide anion stress produced by photocatalysis of nano TiO2 than Synechocystis sp.
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