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Search Results: 1 - 10 of 49736 matches for " Juan Peng "
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Another Important Parameter’s Research on Estimating Self-Similarity  [PDF]
Peng Luo, Juan Wang
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2016, DOI: 10.4236/ijcns.2016.98030
Abstract: It is convincingly demonstrated by numerous studies that the self-similarity of modern multimedia network traffic is presented by Hurst parameter (H). The specific performance is that the similar degree is higher along with the increase of H when H is between 0.5 and 1. However, it is doubtable that whether the complicated process of self-similarity can be described comprehensively by the parameter H only. Therefore, another important parameter cf has been proposed based on the discrete wavelet decomposition in this paper. The significance of the parameters is provided and the performance of the self-similarity process is described better.
Study on Quality Traits for Steamed Bread Made from 25 Representative Wheat Varieties in Shandong Province  [PDF]
Juan Liu, Jichun Tian, Peng Wu, Xiangyang Li, Chao Li
Agricultural Sciences (AS) , 2019, DOI: 10.4236/as.2019.104039
Abstract: In order to study steamed bread quality traits and explore good wheat cultivars, 25 wheat cultivars grown in Shandong province were used through one-process fermentation procedure to examine the variability of steamed bread quality traits and the correlation between quality and score. The results showed that all the steamed bread quality traits expressed large variable coefficient except volume, L* value, l* value and cohesiveness traits, which suggested that the genetic diversity made from wheat in Shandong province was large. The average comprehensive score of the steamed bread was 76.8 for the tested 25 varieties, and ten varieties reached the good steamed bread level, which were Liangxing 99, Luyuan 205, Jimai 22, Jinan 17, Tainong 19, Wennong 17, Huaiyin 84137, and Huaimai 8. The main quality factors affecting the steamed bread score were volume, L* value, A* value, hardness, chewiness, and adhesiveness. Among these factors, the adhesiveness has a significantly positive correlation with the hardness and cohesive, and the volume has a significantly positive correlation with the A* value. The volume, L* value has a significantly positive correlation with score, A* value, hardness and chewiness, and gumminess has a significantly negative correlation with the score. There was no correlation between the score and other traits. The results will benefit the understanding of steamed bread quality in wheat cultivated in Shandong.
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The Ultrastructure Characteristics of Secretory Cavities Associated with the Secretory Products of Ginkgo biloba  [PDF]
Fangren Peng, Hongyan Guo, Mingzhuo Hao, Juan Guo, Yuzhen Yang, Pengpeng Tan
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.31010
Abstract: The origin, development and ultrastructure of secretory cavities in leaf of Ginkgo biloba and its relation to the secretory products were studied by optical and electron microscope. The results indicated that the formation pattern of the secretory cavities was schizo-lysigenous in nature. First, some original central secretory cells in the center of secretory cavities expanded, dissolved then moved aside schizogeneously forming an intercellular space. Later the central and peripheral secretory cells continued to dissolve making the intercellular space larger. This process continued until the central secretory cells degenerated, autolyzed and separated off into cavities. It has been assumed that the secretory products in the secretory cavities of Ginkgo biloba were synthesized mainly in the plastids and the endoplasmic reticulum (ER). However it was our observation that the Mitochondrion, Golgi Body and Cytoplasm were also involved in the synthesis and translocation of the secretions. After synthesized in ER and plastids, the secretory products approached the plasmalemma and fused their membranes with the latter in the form of samll vesicles, and then was eliminated to the spaces between the plasmalemma and the wall. At last the secretory products percolated through the wall that faded into an even looser mesh of fibrillar material toward the cavity.
Risk factors for myopia in Inner Mongolia medical students in China  [PDF]
Yanyan Wu, He Yi, Wenzhong Liu, Haiying Jia, Yuki Eshita, Shubi Wang, Peng Qin, Juan Sun
Open Journal of Epidemiology (OJEpi) , 2012, DOI: 10.4236/ojepi.2012.24013
Abstract: Objective: The aim of the study was to investigate myopia and related factors in Inner Mongolia Medical Students, China. Methods: The survey employed a self-administered questionnaire. All medical students from the Inner Mongolia Medical University campus and those living and learning on campus were eligible. The questionnaire consisted of three sections: students’ basic information, attitude on myopia behavior, and myopia status of students. 6047 medical students completed the questionnaire. Results: A total of 6040 (90.5%) students aged 16 to 28 years (mean 21 ± 1.5 years) completed the questionnaire, of which 1772 (29.3%) were male and 4268 (70.6%) were female. The Mongolia of medical students had the lowest rate (64.3%) of myopia. The prevalence of myopia in Han nationality was highest (72.8%). Myopia occurred more frequently among students living in the city than in the rural. 76.4% urban and 66.6% rural students had myopia (p < 0.001). For myopia students it was established that 85.5% had begun to wear spectacles in middle school. Conclusion: A high myopia prevalence was demonstrated among medical students in the Inner Mongolia area of China. Our study’s findings could help health care professionals develop targeted myopia control policies for the population of students in Inner Mongolia of China and ensure the policies are more rational, useful, and effective.
Sintering and Characterization of (Li, Sb, Ta)-Modified (Na, K)NbO3 Lead-Free Ceramics
Peng Qi,Juan Du,Guozhong Zang
Physics Research International , 2011, DOI: 10.1155/2011/395182
Abstract: Lead-free alkaline niobate-based piezoceramics, (Na0.52K0.435Li0.045)Nb0.87Sb0.08Ta0.05O3 (abbreviated KNLNT-S8), were prepared by conventional solid-state sintering method. The effects of sintering temperature on microstructure and piezoelectric properties of the (Li, Sb, Ta)-modified (Na, K) NbO3 were investigated. Microstructure of the samples sintered at different temperatures was observed by scanning electron microscopy (SEM) and optical microscopy. The KNLNT-S8 sample sintered at 1100°C possessed highest piezoelectric constant 33 and high-field piezoelectric strain coefficient ?33 of 332 pC/N and 530 pm/V, respectively, with electromechanical coupling factors of 0.52 and of 0.48.
The impact of academic stress on medical students attending college in the Inner Mongolia Area of China  [PDF]
Jie Chen, Yanyan Wu, He Yi, Zhijun Li, Yuki Eshita, Peng Qin, Lifu Chen, Juan Sun
Open Journal of Preventive Medicine (OJPM) , 2013, DOI: 10.4236/ojpm.2013.32019
Abstract:

The aim of this study was to examine whether student characteristics affect the risk of health conditions, and explore whether the degree of academic stress affects the level of distress. We surveyed medical students in the Inner Mongolia Medical College China using a questionnaire. A logistic regression analysis was used to ascertain factors associated with distress. The Wilcoxon Mann-Whitney test was used to determine the relationship between distress and different academic stress levels. Of the 6044 students completing questionnaires, 47.5% self-reported distressing body symptoms induced by academic stress. Chi square tests showed statistically significant associations between distress and gender, academic stress, and residence; feeling academic stress caused a more than 1.5 times risk of distress. Gender and academic stress were significantly associated with distress in non-conditional binary logistic regression models. Compared with male students, female students was more likely to feel distress. The Wilcoxon Mann-Whitney test also showed that the distress rate increased with academic stress and a dose-response relationship between the distress rate and stress level was found. The present study indicates that it is important to reduce academic stress and manage it in order that better outcomes be achieved in regard to distress, especially in females.

Sintering and Characterization of (Li, Sb, Ta)-Modified (Na, K)NbO3 Lead-Free Ceramics
Peng Qi,Juan Du,Guozhong Zang
Physics Research International , 2011, DOI: 10.1155/2011/395182
Abstract: Lead-free alkaline niobate-based piezoceramics, (Na0.52K0.435Li0.045)Nb0.87Sb0.08Ta0.05O3 (abbreviated KNLNT-S8), were prepared by conventional solid-state sintering method. The effects of sintering temperature on microstructure and piezoelectric properties of the (Li, Sb, Ta)-modified (Na, K) NbO3 were investigated. Microstructure of the samples sintered at different temperatures was observed by scanning electron microscopy (SEM) and optical microscopy. The KNLNT-S8 sample sintered at 1100°C possessed highest piezoelectric constant and high-field piezoelectric strain coefficient of 332?pC/N and 530?pm/V, respectively, with electromechanical coupling factors of 0.52 and of 0.48. 1. Introduction Lead zirconium-titanate solid solution, PZT, has been in the leading position in piezoceramics for half a century because of its excellent piezoelectric properties. although, the content of PbO in PZT is higher than 60?wt%, the Pb volatilization during sintering process and the discarded PZT products pollute the environment and do harm to human health. Therefore, it is an urgent task developing environment-friendly industrial piezoceramics products. Among several families of lead-free piezoelectric materials, (K, Na)NbO3 (KNN) system has been considered a good candidate for PZT alternative material owing to its strong piezoelectricity. However, it is difficult to prepare well-densified KNN ceramics because of the volatilization of potassium and its reactivity with moisture [1–3]. KNN modified by other compound has been studied in order to improve this piezoelectric properties and sintering performance [4–7]. In our previous research, the morphotropic phase boundary (MPB) of (Na0.52K0.48-xLix)Nb1-x-ySbxTayO3 was identified and (Na0.52K0.435Li0.045)Nb0.905Sb0.045Ta0.05O3 was found to have a high piezoelectric constant of 308?pC/N [8]. In this paper, more Sb was introduced near the MPB composition, to form (Na0.52K0.435Li0.045)Nb0.87Sb0.08Ta0.05O3 (KNLNT-S8) piezoceramics with a further improved piezoelectric constant (332?pC/N). The sintering effects on properties of the (Li, Sb, Ta)-modified (Na, K)NbO3 were investigated. 2. Experimental Chemical composition of our samples in this study was (Na0.52K0.435Li0.045)Nb0.87Sb0.08 Ta0.05O3. Analytical-grade Na2CO3 (99.8%), K2CO3 (99.5%), Li2CO3 (99.9%), Nb2O5 (99.8%), Ta2O5 (99.8%), and Sb2O5 (99.9%) were used as starting materials. With a ratio to alcohol of 1?:?1.3, the chemicals were wet-milled in polyethylene bottles with ZrO2 balls as milling media for 12?h. The milled slurry was dried and pressed into discs of
Mean-Field Backward Stochastic Differential Equations and Related Partial Differential Equations
Rainer Buckdahn,Juan Li,Shige Peng
Mathematics , 2007,
Abstract: In [5] the authors obtained Mean-Field backward stochastic differential equations (BSDE) associated with a Mean-field stochastic differential equation (SDE) in a natural way as limit of some highly dimensional system of forward and backward SDEs, corresponding to a large number of ``particles'' (or ``agents''). The objective of the present paper is to deepen the investigation of such Mean-Field BSDEs by studying them in a more general framework, with general driver, and to discuss comparison results for them. In a second step we are interested in partial differential equations (PDE) whose solutions can be stochastically interpreted in terms of Mean-Field BSDEs. For this we study a Mean-Field BSDE in a Markovian framework, associated with a Mean-Field forward equation. By combining classical BSDE methods, in particular that of ``backward semigroups" introduced by Peng [14], with specific arguments for Mean-Field BSDEs we prove that this Mean-Field BSDE describes the viscosity solution of a nonlocal PDE. The uniqueness of this viscosity solution is obtained for the space of continuous functions with polynomial growth. With the help of an example it is shown that for the nonlocal PDEs associated to Mean-Field BSDEs one cannot expect to have uniqueness in a larger space of continuous functions.
Nonlinear stochastic differential games involving a major player and a large number of collectively acting minor agents
Rainer Buckdahn,Juan Li,Shige Peng
Mathematics , 2013,
Abstract: The purpose of this paper is to study 2-person zero-sum stochastic differential games, in which one player is a major one and the other player is a group of $N$ minor agents which are collectively playing, statistically identical and have the same cost-functional. The game is studied in a weak formulation; this means in particular, we can study it as a game of the type "feedback control against feedback control". The payoff/cost functional is defined through a controlled backward stochastic differential equation, for which driving coefficient is assumed to satisfy strict concavity-convexity with respect to the control parameters. This ensures the existence of saddle point feedback controls for the game with $N$ minor agents. We study the limit behavior of these saddle point controls and of the associated Hamiltonian, and we characterize the limit of the saddle point controls as the unique saddle point control of the limit mean-field stochastic differential game.
Compositional Shifts in Ammonia-Oxidizing Microorganism Communities of Eight Geographically Different Paddy Soils —Biogeographical Distribution of Ammonia-Oxidizing Microorganisms  [PDF]
Lu Lu, Huilin Li, Yan He, Jing Zhang, Juan Xiao, Chao Peng
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.93025
Abstract: Soil nitrification is mediated by ammonia-oxidizing archaea (AOA) and bacteria (AOB), which occupy different specialized ecological niches. However, little is known about the diversification of AOA and AOB communities in a large geographical scale. Here, eight paddy soils collected from different geographic regions in China were selected to investigate the spatial distribution of AOA and AOB, and their potential nitrification activity (PNA). The result showed that the abundance of AOA was predominant over AOB, indicating that the rice fields favor the growth of AOA. PNA highly varied from 0.43 to 3.57 μg NOX-N·g·dry·soil·h-1, and was positively related with soil NH3 content, the abundance of AOA community, and negatively related with the diversity of AOB community (P < 0.01), which indicating that AOA might be the more dominant ammonia oxidizers in the collected paddy soils. Denaturing gradient gel electrophoresis fingerprints of amoA genes revealed remarkable differences in the compositions of AOA and AOB community. Phylogenetic analyses of amoA genes showed that Nitrosospiracluster-3-like and Nitrosomonas cluster 7-like AOB extensively dominated the AOB communities, and 54d9-like AOA within the soil group 1.1b predominated in AOA communities in paddy soils. Redundancy analysis suggested that the spatial variations of AOA community structure were influenced by soil TN content (P < 0.01), while no significant correlation between AOB community structure and soil properties was found. Findings highlight that ammonia oxidizers exhibit spatial variations in complex paddy fields due to the joint influence of soil variables associated with N availability.
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