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Search Results: 1 - 10 of 16665 matches for " QI Hongyan "
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Global Periodic Attractors for a Class of Infinite Dimensional Dissipative Dynamical Systems  [PDF]
Hongyan Li
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.35067
Abstract:

In this paper we consider the existence of a global periodic attractor for a class of infinite dimensional dissipative equations under homogeneous Dirichlet boundary conditions. It is proved that in a certain parameter, for an arbitrary timeperiodic driving force, the system has a unique periodic solution attracting any bounded set exponentially in the phase space, which implies that the system behaves exactly as a one-dimensional system. We mention, in particular, that the obtained result can be used to prove the existence of the global periodic attractor for abstract parabolic problems.

Uniform Exponential Attractors for Non-Autonomous Strongly Damped Wave Equations  [PDF]
Hongyan Li
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.28086
Abstract:

In this paper, we study the existence of exponential attractors for strongly damped wave equations with a time-dependent driving force. To this end, the uniform H?lder continuity is established to the variation of the process in the phase apace. In a certain parameter region, the exponential attractor is a uniformly exponentially attracting time-dependent set in the phase apace, and is finite-dimensional no matter how complex the dependence of the external forces on time is. On this basis, we also obtain the existence of the infinite-dimensional uniform exponential attractor for the system.

The Quantitative Analysis of the Oxidants/Antioxidants in the Tissues of Lung Cancer Patients
Min CAO,Qi LI,Zongde ZHANG,Hongyan JIA
Chinese Journal of Lung Cancer , 2009,
Abstract: Background and objective The relationship between antioxidants and tumor was gradually paid attention. The changes of activities and the levels of expression mRNA and protein of oxidants and antioxidants, were evaluated in 113 lung tumor and 64 tumor-free lung tissues collected between the years 2006 and 2007 from 113individuals with surgically resectable lung cancer in order to understand the mechanism of the onset and development of lung cancer. Methods The activities of TSOD, MnSOD, CuZnSOD, GPx, H2O2 and MDA were determined by chromometry.MnSOD, CuZnSOD mRNA and protein expression levels were evaluated by Reverse transcription polymerase chain reaction and Western Blot analysis in tumor tissues, as well as corresponding control tissues. Results Comparing with the levels of these indexes in the tumor-free tissues, the activities of TSOD, CuZnSOD, GPx were higher, H2O2 and MDA were lower in the tumor tissues (P <0.05 or P <0.01). Comparing with the group of the squamous cell carcinoma, H2O2, MDA were higher inthe tumor tissues of the group of adenocarcinoma (P <0.05 or P <0.01). There was less MnSOD mRNA and protein in tumor than in tumor-free lung. The contents of CuZnSOD mRNA and protein in tumor were less than those in tumor-free lung tissue (P <0.01). Conclusion The imbalance between the oxidants and antioxidants exists in the tissues of patients with lung cancer. The imbalance may have some relationship with the onset and development of lung cancer.
Northern-Hemisphere Snow Cover Patterns and Formation Conditions in Winter 2007 and 2012 Northern-Hemisphere Snow Cover Patterns and Formation Conditions in Winter 2007 and 2012
CUI Hongyan,QIAO Fangli,SHU Qi,YU Long
- , 2016,
Abstract: The Arctic sea ice minimum records appeared in the Septembers of 2007 and 2012, followed by high snow cover areas in the Northern Hemisphere winters. The snow cover distributions show different spatial patterns in these two years: increased snow cover in Central Asia and Central North America in 2007, while increased snow cover in East Asia and northwestern Europe in 2012. The high snow cover anomaly shifted to higher latitudes in winter of 2012 compared to 2007. It is noticed that the snow cover had positive anomaly in 2007 and 2012 with the following conditions: the negative geopotential height and the related cyclonic wind anomaly were favorable for upwelling, and, with the above conditions, the low troposphere and surface air temperature anomaly and water vapor anomaly were favorable for the formation and maintenance of snowfalls. The negative geopotential height, cyclonic wind and low air temperature conditions were satisfied in different locations in 2007 and 2012, resulting in different spatial snow cover patterns. The cross section of lower air temperature move to higher latitudes in winter of 2012 compared to 2007
Combustion Properties of Metal Particles as Components of Modified Double-Base Propellants
Combustion Properties of Metal Particles as Components of Modified Double-Base Propellants

Xiaofei Qi,Hongyan Li,Ning Yan,Ying Wang,Xueli Chen
- , 2018, DOI: 10.15918/j.jbit1004-0579.201827.0218
Abstract: Metal particles such as aluminum (Al), magnesium (Mg), boron (B) and nickel (Ni), as well as Mg/Al alloy (Mg/Al3/4) are currently the most widely used ingredients in modified double-base propellants. In this contribution, the combustion properties of the metal species are studied by means of the high-speed photography technique and the non-contact wavelet-based measurement of flame temperature distribution. The combustion process of the Al, Mg and Mg/Al samples shows both gas phase reaction and surface oxidation, which yield volatile and nonvolatile products, corresponding to the oxide and suboxide respectively. However, the combustion of B and Ni shows only gas phase reaction, due to their high melting point as well as high enthalpy of vaporization. In addition to the experiments, a hypothetical combustion model has been proposed to clarify the combustion characteristics of metal species in modified double-base propellants.
Metal particles such as aluminum (Al), magnesium (Mg), boron (B) and nickel (Ni), as well as Mg/Al alloy (Mg/Al3/4) are currently the most widely used ingredients in modified double-base propellants. In this contribution, the combustion properties of the metal species are studied by means of the high-speed photography technique and the non-contact wavelet-based measurement of flame temperature distribution. The combustion process of the Al, Mg and Mg/Al samples shows both gas phase reaction and surface oxidation, which yield volatile and nonvolatile products, corresponding to the oxide and suboxide respectively. However, the combustion of B and Ni shows only gas phase reaction, due to their high melting point as well as high enthalpy of vaporization. In addition to the experiments, a hypothetical combustion model has been proposed to clarify the combustion characteristics of metal species in modified double-base propellants.
The Practical Method of Drawing a Dummy Activity
虚工序的实用画法

Jin Qi,Qi Jianxun,Liu Hongyan,
靳 祁
,乞建勋,刘鸿雁

系统工程理论与实践 , 1998,
Abstract: This article deals with the practical method instead of the optimal method of drawing a dummy activity.First,the article illustrated the simplest programmed drawing method of a dummy activity.Second,it discussed the practical drawing method,which had not been mentioned worldwide yet,of a dummy activity when adjusting the network chart.Furthermore,it put forward the idea of "the most,the first principle",and the "redundency principle",which,in most cases,are not only practical but also optimal.
Profile of the culturable microbiome capable of producing acyl-homoserine lactone in the tobacco phyllosphere
Di Lv,Anzhou M,Xuanming Tang,Zhihui Bai,Hongyan Qi,Guoqiang Zhuang,
Di Lv
,Anzhou M,Xuanming Tang,Zhihui Bai,Hongyan Qi,Guoqiang Zhuang

环境科学学报(英文版) , 2013,
Abstract: Bacterial populations coexisting in the phyllosphere niche have important effects on plant health. Quorum sensing (QS) allows bacteria to communicate via diffusible signal molecules, but QS-dependent behaviors in phyllosphere bacterial populations are poorly understood. We investigate the dense and diverse N-acyl-homoserine lactone (AHL)-producing phyllosphere bacteria living on tobacco leaf surfaces via a culture-dependent method and 16S rRNA gene sequencing. Our results indicated that approximately 7.9%-11.7% of the culturable leaf-associated bacteria have the ability to produce AHL based on the assays using whole-cell biosensors. Sequencing of the 16S rRNA gene assigned the AHL-producing strains to two phylogenetic groups, with Gammaproteobacteria (93%) as the predominant group, followed by Alphaproteobacteria. All of the AHL-producing Alphaproteobacteria were affiliated with the genus Rhizobium, whereas the AHL-producing bacteria belonging to the Gammaproteobacteria mainly fell within the genera Pseudomonas, Acinetobacter, Citrobacter, Enterobacter, Pantoea and Serratia. The bioassays of supernatant extracts revealed that a portion of the strains have a remarkable AHL profile for AHL induction activity using the two different biosensors, and one compound in the active extract of a representative isolate, NTL223, corresponded to 3-oxo-hexanoyl-homoserine lactone. A large population size and diversity of bacteria capable of AHL-driven QS were found to cohabit on leaves, implying that cross-communication based AHL-type QS may be common in the phyllosphere. Furthermore, this study provides a general snapshot of a potential valuable application of AHL-producing bacteria inhabiting leaves for their presumable ecological roles in the phyllosphere.
CSR Based on Game Theory  [PDF]
Weixiao Zhu, Hongyan Li
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.37071
Abstract:


In recent years, Corporate Social Responsibility (CSR) has gradually become a hot topic with the public’s increasing concern. In this study, authors briefly introduce some reviews and concepts of CSR, and then combine the idea of Game Theory and Matrix linear equations method to conduct an empirical analysis between enterprises with enterprises and enterprises with government. By analysis, we find that it is very important for the development of enterprises in these two parts: the fulfillment of social responsibility and the supervision of government. Finally, the authors also put forward some suggestions to the fulfillment of CSR and hope to improve the poor sense of presence.


The Incentive Problems Study of the Employees of the New Generation under the Structure of Grade in China  [PDF]
Qing Xia, Hongyan Li
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.38081
Abstract:


The incentive problems of the employees of the new generation are increasingly becoming the focus of managers, because they go to work and gradually become the main force in the labor market. However, special social-economic background has given the crowd a few generational features, which require us to explore the incentive work of the new generation with a whole new perspective. In addition, our country is a country which attaches great importance to the cultural inheritance and the traditional national culture deeply affects every generation in different degree. The social structure of the structure of grade as an important part of traditional Chinese culture is bound to be a unique impact on the employees of the new generation. So, this paper will elaborate the incentive problems of the new generation mainly from the perspective of the China’s social structure (the structure of grade) and theory of cognitive dissonance.


The Seismic-Geological Comprehensive Prediction Method of the Low Permeability Calcareous Sandstone Reservoir  [PDF]
Hongyan Jiao, Zhiying Ding
Open Journal of Geology (OJG) , 2016, DOI: 10.4236/ojg.2016.68058
Abstract: Currently in Niu-zhuang sub-sag, the seismic reflection amplitude of the newly discovered turbidite sandstone is stronger in the third Segment. The main reason is that Calcareous components accounts for a large part and physical properties is relatively poor, which results in no corresponding relation between reservoir and seismic attributes, and effective reservoir is difficult to predict and describe. Therefore, using the method of geological statistics, we firstly study the distribution of calcareous matters, secondly study the contribution to seismic reflection amplitude made by Calcareous high impedance component; thirdly analyze its influence on actual seismic reflection amplitude and determine the lithology thickness of Calcareous via replacement forward modeling. At last, we characterize the reservoir using the amplitude of calcareous matters. It proves that the method of seismic-geological comprehensive prediction is reliable. It has good guidance for exploration and development of the calcareous sand lithologic reservoir in similar areas.
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