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Search Results: 1 - 10 of 191883 matches for " LIU Xing-li "
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Nitrogen released from different plant residues of the Loess Plateau and their additions on contents of microbial biomass carbon, nitrogen in soil

Jian-Bin Zhou,Xing-Li Chen,Ying-Li Zhang,Jian-Liang Liu,

生态学报 , 2010,
Location Management Methods for the Third-Generation Mobile System

LIU Xing-li,LIN Jin-zhao,HE Fang-bai,

重庆邮电大学学报(自然科学版) , 2001,
Abstract: 综述了现在的移动通信系统,尤其是GSM系统中使用的主要定位规程.探讨了位置更新对无线资源及MSC/VLR处理能力的影响.建议了第三代移动通信系统中可能采用的几种位置管理方法.
Effects of fertilization on carbon/nitrogen ratio of maize straw and its mineralization in soil.

CHEN Xing-li,ZHOU Jian-bin,LIU Jian-liang,GAO Zhong-xia,YANG Xue-yun,

应用生态学报 , 2009,
Abstract: 以两个长期定位试验不同施肥处理玉米秸秆为对象,采用室内培养试验研究了其碳、氮养分在土壤中的矿化特性.结果表明:与未施肥处理相比,施用化肥(NPK)或化肥与有机肥配施(MNPK)处理明显增加了玉米秸秆的氮素含量,降低了其C/N.不同处理秸秆碳、氮矿化量和被微生物固持的碳、氮量因培养时期不同而异,NPK、MNPK和240 kg N·hm-2处理秸秆在培养期间碳的矿化率显著高于相应不施肥处理;60 d培养期结束后,NPK处理秸秆的有机碳矿化量最大,占加入总有机碳的13.24%.各施肥处理玉米秸秆施入土壤后引起的土壤矿质氮固持量均较不施肥秸秆低,其中MNPK处理最低.施用秸秆增加了土壤微生物的代谢熵(qCO2),但不同处理间qCO2的差异较小;各处理土壤微生物生物量碳、氮含量因培养时期不同而异.因此,生产中利用秸秆时应考虑不同施肥处理秸秆养分含量的差异.
Posttraumatic stress disorder among orphans in Wenchuan earthquake

LIU Ming-Xin,WANG Yan,ZHANG Xing-Li,ZHU Ming-Jing,SHI Jian-Nong,

中国科学院研究生院学报 , 2010,
Abstract: 为考察汶川大地震中9~15岁孤儿的PTSD检出率、症状特点及其发展. 采用《儿童版事件冲击量表》在地震半年和一年后对188名孤儿和非孤儿进行重复施测. 结果表明,在地震半年和一年后,孤儿PTSD的检出率以及症状得分均高于非孤儿. 震后孤儿比非孤儿更容易罹患PTSD,尤其表现在有更高水平的闯入性症状,并且潜伏期更长.
Reproduction of a hyperkalemia animal model
Jian HUO,Xing-li SU,Shuang WANG
Medical Journal of Chinese People's Liberation Army , 2011,
Abstract: Objective To reproduce an animal model of myocardium hyperkalemia and to relieve its symptoms with calcium chloride(CaCl2) with the purpose of observing the effect of hyperkalemia on electrocardiogram Ⅱ(ECGⅡ).Methods Fifty toads(either gender) were assigned into two groups,i.e.experiment group and control group.Animals in experiment group were injected with 0.3ml of 0.2% potassium chloride(KCl) via abdominal vein to reproduce hyperkalemia model,while those in control group were injected same amount of 0.9% sodium chloride(NaCl),then ECG Ⅱ was synchronously recorded.Two minutes later,animals in experiment group were injected with 0.2ml of 1% calcium chloride(CaCl2) via the abdominal vein to relieve hyperkalemia,and ECGⅡ was again synchronously recorded.Results After injection of 0.2% KCl,ECG Ⅱ of the animals in experiment group showed that the heart rate was slowed down(P < 0.05),P-R interval was extended(P < 0.05),QRS was broadened and lowered(P < 0.05),T peak became higher(P < 0.05) as compared with that in control group.Two minutes after injection of 1% CaCl2,the ECG Ⅱ of the animals in experiment group recovered to normal status,and no significant difference was found between that of experiment group and control group.Conclusion The changes in ECG Ⅱ in toad model of myocardium hyperkalemia,produced by injection of 0.2% KCl,and then relieve the symptoms by injection of 1% CaCl2 via abdominal vein,is similar to that in mammals.Compared with other animal models,the hyperkalemia toad model is more convenient to be established with practical and stable result,and the cost is lower.
Eyebrow Recognition Based on Hidden Markov Models

LI Yu-jian,LI Xing-li,

中国图象图形学报 , 2008,
Abstract: 为说明人类的眉毛作为一种生物特征使用的可能性和可行性,提出了一种基于离散HMM的眉毛识别方法,并对它的识别率随观察符号个数和模型状态数的变化关系进行了初步的实验研究。实验结果表明,该方法在一个27人的小规模眉毛数据库上最高识别率可以达到92.6%。
Subconscious Effect on Pedestrian Counter Flow

KUANG Hua,SONG Tao,LI Xing-Li,DAI Shi-Qiang,

中国物理快报 , 2008,
Abstract: We propose an extended lattice gas model with different maximum velocities to simulate pedestrian counter flow by considering the subconscious behaviour of walkers. Four types of walkers including faster right walkers, slower right walkers, faster left walkers and slower left walkers are involved in the simulation. The simulation results show that our model can capture some essential features of pedestrian counter flows, such as the lane formation, segregation effect and phase separation at higher densities. We also find that the subconscious effect can reduce the occurrence of jam cluster evidently compared with the case of un-subconscious effect. At large maximum velocity, the critical density corresponding to the maximum flow rate of the fundamental diagram is in good agreement with the empirical results.
Phase transition on speed limit traffic with slope

Li Xing-Li,Song Tao,Kuang Hua,Dai Shi-Qiang,

中国物理 B , 2008,
Abstract: Through introducing a generalized optimal speed function to consider spatial position, slope grade and variable safe headway, the effect of slope in a single-lane highway on the traffic flow is investigated with the extended optimal speed model. The theoretical analysis and simulation results show that the flux of the whole road with the upgrade (or downgrade) increases linearly with density, saturates at a critical density, then maintains this saturated value in a certain density range and finally decreases with density. The value of saturated flux is equal to the maximum flux of the upgrade (or downgrade) without considering the slight influence of the driver's sensitivity. And the fundamental diagrams also depend on sensitivity, slope grade and slope length. The spatiotemporal pattern gives the segregation of different traffic phases caused by the rarefaction wave and the shock wave under a certain initial vehicle number. A comparison between the upgrade and the downgrade indicates that the value of saturated flux of the downgrade is larger than that of the upgrade under the same condition. This result is in accordance with the real traffic.
Adaptive digital watermarking algorithm based on energy analysis of wavelet coefficients block

ZHU Xing-li,ZHANG Jia-shu,

计算机应用 , 2006,
Abstract: To enhance the robustness of watermark, an improved digital watermarking algorithm based on wavelet transform was proposed. The third level detail sub-images decomposed the original image using three levels DWT(Discrete Wavelet Transform) were divided into non-overlap blocks. Then the blocks, which were more adaptable to embed watermark, were selected by block energy analysis. At the end, combining with the properties of human visual system, the watermark was adaptively embedded into the largest coefficients which belonged to the selected blocks. Theoretical analysis and experiment results show that the watermark generated with the proposed algorithm is imperceptible and more robust.
Models and Algorithms for Alignment of Biological Networks

GUO Xing-Li,GAO Lin,CHEN Xin,

软件学报 , 2010,
Abstract: 生物网络比对是生物体结构、功能和进化分析的重要研究手段.首先给出了生物网络比对问题的形式化定义;其次重点分析了现有的比对模型和算法,按照比对方法的数学特性对其进行了分类,并对典型算法结合应用进行了深入探讨,对3类比对方法的特点进行了总结与比较;再次,分析归纳了生物网络比对软件,阐述了生物网络比对研究的意义和应用;最后指出了生物网络比对研究中的关键问题及生物网络比对未来的研究方向.
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