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Search Results: 1 - 10 of 74119 matches for " PAN Da-ren "
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Cloud Base Height and Effective Cloud Emissivity Retrieval with Ground-Based Infrared Interferometer
PAN Lin-Jun,LU Da-Ren,
PAN Lin-Jun
,LU Da-Ren

大气和海洋科学快报 , 2012,
Abstract: Based on ground-based Atmospheric Emitted Radiance Interferometer (AERI) observations in Shouxian, Anhui province, China, the authors retrieve the cloud base height (CBH) and effective cloud emissivity by using the minimum root-mean-square difference method. This method was originally developed for satellite remote sensing. The high-temporal-resolution retrieval results can depict the trivial variations of the zenith clouds continuously. The retrieval results are evaluated by comparing them with observations by the cloud radar. The comparison shows that the retrieval bias is smaller for the middle and low cloud, especially for the opaque cloud. When two layers of clouds exist, the retrieval results reflect the weighting radiative contribution of the multi-layer cloud. The retrieval accuracy is affected by uncertainties of the AERI radiances and sounding profiles, in which the role of uncertainty in the temperature profile is dominant.
Isolation and Sequence Analysis of NBS-type Resistance Gene Analogues in Sweet Potato (Ipomoea batatas (L.) Lam.)

CHEN Guan-shui,ZHOU Yi-fei,LIN Sheng,PAN Da-ren,

热带亚热带植物学报 , 2006,
Abstract: Degenerate primers based on conserved motif (P-loop and GLPL) of the nucleotide binding site (NBS) region from the cloned plant disease resistance genes were used to isolate resistance gene analogues (RGAs) from genomic DNA of the sweet potato (Ipomoea batatas (L.) Lam.) cultivar Qingnong No. 2. The desired bands (~500 bp) were purified from the gel, and then cloned by T/A cloning. After sequencing and analyzing by alignment, 15 RGAs with uninterrupted open reading frames (ORFs) were obtained. Sequence identity among the 15 RGA nucleotide sequences ranged from 41.2% to 99.4%, while the 15 RGAs deduced amino acid sequences showed identity ranged from 20.6% to 100%. The phylogenetic analyses for RGA nucleotide sequences and the deduced amino acids showed that RGAs from sweet potato were divided into two groups, TIR (Drosophila Toll or human interleukin receptor-like) type and nonTIR type. The analysis of RGAs amino acid sequence structures suggested that they contained the domains such as P-loop, Kinase-2, Kinase-3a, and GLPL. These results showed that NBS type RGAs isolated from sweet potato might have the same origin and mechanism of evolution as that in other plants.
A New Feature in Some Quasi-discontinuous Systems
Shunguang Wu,Da-Ren He
Physics , 1999, DOI: 10.1088/0256-307X/17/6/004
Abstract: Many systems can display a very short, rapid changing stage (quasi-discontinuous region) inside a relatively very long and slowly changing process. A quantitative definition for the "quasi-discontinuity" in these systems has been introduced. We have shown by a simplified model that extra-large Feigenbaum constants can be found inside some period-doubling cascades due to the quasi-discontinuity. As an example, this phenomenon has also been observed in Rose-Hindmash model describing neuron activities.
Calibration and Validation of an All-Sky Imager
Preliminary Extracting Radiance from All-sky Images

HUO Juan,LU Da-Ren,
HUO Juan
,LU Da-Ren

大气和海洋科学快报 , 2009,
Abstract: The automatic all-sky imager developed by the Institute of Atmospheric Physics, Chinese Academy of Sciences, provides all-sky visible images in the red, green, and blue channels. This paper presents three major calibration experiments of the all-sky imager, geometric angular calibration, optical calibration, and radiometric calibration, and then infers an algorithm to retrieve relative radiance from the all-sky images. Field experiments show that the related coefficient between retrieved radiance and measured radiance is about 0.91. It is feasible to use the algorithm to retrieve radiance from images. The paper sets up a relationship between radiance and the image, which is useful for using the all-sky image in numerical-simulations that predict more meteorological parameters.
Characteristics of Solar Radiation and the Impact of Clouds at Yangbajing, Tibet
HUO Juan,LU Da-Ren,
HUO Juan
,LU Da-Ren

大气和海洋科学快报 , 2012,
Abstract: Yangbajing (YBJ) is located in the Tibetan Plateau, China. The characteristics of solar radiation and its relationship with clouds at YBJ from April 2009 to April 2010 were analyzed in this paper. The annual mean solar radiation was 478.4 W m-2, and the annual mean transmittance was 0.713. The atmospheric mean transmittance of clear skies reaches 0.828 when the solar elevation angle (SEA) is greater than 10 degrees. Comparisons with numerical simulations show that the atmosphere of YBJ is clean. Impacts from atmospheric conditions on solar radiation are similar for clear skies during the year because the standard deviation of transmittance in clear skies was less than 0.05 when the SEA was greater than 10 degrees. It is important to understand the impact of clouds on solar radiation without considering other impact factors. In the last part of this article, the authors analyzed and established a statistical quantitative relationship between surface solar radiation and cloud fraction.
Canonical Correlation Analysis of Physiological and Chemical Index in Leaves and Quality Characters in Chewing Cane

LIN Jiang-bo,PAN Da-ren,PAN Shi-ming,LIN Yi-xin,WU Shui-jin,

热带亚热带植物学报 , 2008,
Abstract: The relationship between ten physiological and chemical indexes in leaves of sugarcane (Saccharum officinarum L.) and five quality characters of stalks were conducted by using method of canonical correlation analysis. The results indicated that at tillering stage, there were positive correlations between content of carotenoid and sucrose content in cane, content of total soluble sugar and water content in cane, content of total soluble sugar and reducing sugar in juice, respectively. At early elongating stage, there were positive correlations between contents of chlorophyll, activity of catalase and sucrose contents in cane, content of soluble protein and content of cane fibre, respectively. At middle elongating stage, there were positive correlations between activity of Mg2+-ATPase and cane fibre, content of soluble sugar and sucrose content in cane, respectively, but there was negative correlation between carbon-nitrogen ratio (C/N) and water content in cane. At the maturing stage, there was positive correlation between content of carotenoid and sucrose contents in cane, and negative correlation between contents of soluble sugar and reducing sugar in juice.
The Expression Analysis of Pathogenesis-related Protein Encoding Genes in Chewing Cane Leaves Infected by Gibberella fujikuroi
Gibberella fujikuroi侵染果蔗叶片病程相关蛋白编码基因的表达分析

LIN Sheng,ZHOU Ming-ming,CHEN Ting,CHEN Guan-shui,ZHOU Yi-fei,PAN Da-ren,

热带亚热带植物学报 , 2012,
Abstract: 利用实时荧光定量RT-PCR,用梢腐病病原菌(Gibberella fujikuroi)侵染不同果蔗品种叶片,对病程相关蛋白编码基因SoSOD、SoCHIT、SoPOD与SoTPS6P的转录水平进行了分析。结果表明,果蔗的SoSOD、SoCHIT、SoPOD与SoTPS6P受到梢腐病病原菌的诱导表达,丰城紫皮、白鳝、福安与拔地拉果蔗叶片中它们的表达量较高,而在温岭、宁德与歪干担叶片中的表达量较低。这说明这些病程相关蛋白编码基因表达水平与不同果蔗品种的梢腐病抗病性存在一定的关联。
Study on some interconnecting bilayer networks
Yan-Qin Qu,Xiu-Lian Xu,Shan Guan,Kai-Jun Li,Si-Jun Pan,Chang-Gui Gu,Yu-Mei Jiang,Da-Ren He
Computer Science , 2010,
Abstract: We present a model, in which some nodes (called interconnecting nodes) in two networks merge and play the roles in both the networks. The model analytic and simulation discussions show a monotonically increasing dependence of interconnecting node topological position difference and a monotonically decreasing dependence of the interconnecting node number on function difference of both networks. The dependence function details do not influence the qualitative relationship. This online manuscript presents the details of the model simulation and analytic discussion, as well as the empirical investigations performed in eight real world bilayer networks. The analytic and simulation results with different dependence function forms show rather good agreement with the empirical conclusions.
Empirical study on some interconnecting bilayer networks
Yan-Qin Qu,Xiu-Lian Xu,Shan Guan,Kai-Jun Li,Si-Jun Pan,Chang-Gui Gu,Yu-Mei Jiang,Da-Ren He
Computer Science , 2010,
Abstract: This manuscript serves as an online supplement of a preprint, which presents a study on a kind of bilayer networks where some nodes (called interconnecting nodes) in two layers merge. A model showing an important general property of the bilayer networks is proposed. Then the analytic discussion of the model is compared with empirical conclusions. We present all the empirical observations in this online supplement.
Global Structures and Multi-Temporal Variabilities of MLT Migrating Diurnal Tide

CHEN Ze-Yu,LU Da-Ren,

中国物理快报 , 2008,
Abstract: Migrating diurnal tide in the MLT region is examined by the application of Hough mode decomposition with the tide delineated from the SABER/TIMED temperatures over 2002--2006. The decomposition results show that in the height range 60--100km, the (1, 1) mode is the most predominant among eight leading Hough modes including four propagating and four trapped modes. It exhibits a sustained maximum at 97km and significant semi-annual oscillation. Additionally, a novel feature of inter-annual variation with period of about two years is clearly seen in the (1, 1) mode, e.g., repeated maxima are seen at the March equinox of 2002, 2004 and 2006, respectively. This feature is further manifested by the tidal amplitudes in the height range 70--100km in the height-time cross-section at the equator. It is likely of the QBO as the height range just coincides to where the zonal mean zonal winds derived by using the UARS data exhibiting the QBO. The other results show that the (1, 2) mode is important at <80km exhibiting comparable amplitude to that of the (1, 1) mode, and in particular the nearly anti-correlation with the (1, 1) mode. The tide at about 85km is suggested of rather complex as the four trapped modes exhibit maximum at these heights, which indicates the presence of local excitations or sources at below.
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