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Search Results: 1 - 10 of 28885 matches for " Haibo Sun "
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Variational Method to the Impulsive Equation with Neumann Boundary Conditions
Juntao Sun,Haibo Chen
Boundary Value Problems , 2009, DOI: 10.1155/2009/316812
Abstract: We study the existence and multiplicity of classical solutions for second-order impulsive Sturm-Liouville equation with Neumann boundary conditions. By using the variational method and critical point theory, we give some new criteria to guarantee that the impulsive problem has at least one solution, two solutions, and infinitely many solutions under some different conditions, respectively. Some examples are also given in this paper to illustrate the main results.
Variational Method to the Impulsive Equation with Neumann Boundary Conditions
Sun Juntao,Chen Haibo
Boundary Value Problems , 2009,
Abstract: We study the existence and multiplicity of classical solutions for second-order impulsive Sturm-Liouville equation with Neumann boundary conditions. By using the variational method and critical point theory, we give some new criteria to guarantee that the impulsive problem has at least one solution, two solutions, and infinitely many solutions under some different conditions, respectively. Some examples are also given in this paper to illustrate the main results.
Direct Surge Margin Control for Aeroengines Based on Improved SVR Machine and LQR Method
Haibo Zhang,Fengyong Sun
Mathematical Problems in Engineering , 2013, DOI: 10.1155/2013/870215
Abstract: A novel scheme of high stability engine control (HISTEC) on the basis of an improved linear quadratic regulator (ILQR), called direct surge margin control, is derived for super-maneuver flights. Direct surge margin control, which is different from conventional control scheme, puts surge margin into the engine closed-loop system and takes surge margin as controlled variable directly. In this way, direct surge margin control can exploit potential performance of engine more effectively with a decrease of engine stability margin which usually happened in super-maneuver flights. For conquering the difficulty that aeroengine surge margin is undetectable, an approach based on improved support vector regression (SVR) machine is proposed to construct a surge margin prediction model. The surge margin modeling contains two parts: a baseline model under no inlet distortion states and the calculation for surge margin loss under supermaneuvering flight conditions. The previous one is developed using neural network method, the inputs of which are selected by a weighted feature selection algorithm. Considering the hysteresis between pilot input and angle of attack output, an online scrolling window least square support vector regression (LSSVR) method is employed to firstly estimate inlet distortion index and further compute surge margin loss via some empirical look-up tables. 1. Introduction To begin with, we will provide a brief background on high stability control for aeroengines, which is an aerodynamic concept different from the stability concept in control theory and an unstable state means that the fan or compressor of an engine goes into a surge state. Super-maneuverability is one of the essential techniques of modern fighters. Yet, in a post-stall state, when engines work under the conditions of high angle of attack, the inlet distortion becomes severe, leading to unstable operations such as weakened engine performance, reduced steady operating surge margin, and even surge in serious conditions. For this issue, national aeronautics and space administration (NASA) initialed and led a famous high stability engine control (HISTEC) research project in 1993, in which an engine stability control in super-maneuver flights was highlighted, and the main idea is that the pressure ratio of an F-100 turbofan engine could be adaptively controlled to regulate cooperating working point or the surge margin of its fan and compressor when an F-15 ACTIVE (advanced control technology for integrated vehicles) aircraft entered into super-maneuver states. Thus, sufficient stability
An Improved Efficient Self-healing Group Key Distribution
Sun Haibo,Lin Dongdai,Xue Rui
Asian Journal of Information Technology , 2012,
Abstract: This study presents new group key distribution techniques for large and dynamic groups over unreliable channels. The techniques are based on the self-healing key distribution methods (with revocation capability) By introducing a novel personal key distribution technique, this paper reduces the communication overhead of personal key share distribution and the communication overhead of self-healing key distribution with t-revocation capability where t is the maximum number of colluding group members. Because this technique adopts the polynomial to realize, the degree of these polynomials determine the threshold of the number of colluding group members. And because this scheme is based on ID, so the identity of the excluded member will be open. In this paper, we improved a new scheme based on exponential function to avoid the limitation of threshold and at the same time, our scheme is not based on ID, the identity of member can be protected effectively. All these results are achieved without sacrificing the unconditional security of key distribution and overhead of communication and personal storage. In addition, two techniques proposed to allow trade-off between the broadcast size and the recoverability of lost session keys are also adaptive in present scheme.
A New Group Key Exchange Protocol Based on Zero-Knowledge Set
Sun Haibo,Lin Dongdai,Xue Rui
Asian Journal of Information Technology , 2012,
Abstract: Zero-knowledge set is a set that has zero-knowledge quality. The structure of the set makes that a prover can commit to any arbitrary finite set of strings and for any string, reveal with a proof whether a given element is in the set without revealing any knowledge beyond the verity of these membership assertions. In this study, we advance a new Group Key Distribution protocol based on zero-knowledge set and polynomial computation so that the identity and number of the group members can be concealed and realize key distribution at the same time. The protocol not only provides a dynamic distribution on a group key, but also guarantees nobody can get additional information about other members except the group key. Compared with previous work, our protocol can provide more security and is suitable for some special network application, such as military action and anonymous e-commerce meeting.
Lodging-Resistance Breeding of Platycodon grandiflorus Using Distant Hybridization  [PDF]
Yan Ma, Yan Lin, Huali Zhang, Fang Liang, Liping Sun, Maoliang Wang, Haibo Xin
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.618281
Abstract: The distant hybridization was used in lodging-resistance breeding of Platycodon grandiflorus. The parents were Platycodon grandiflorus (♀) and Campanula medium (♂). 187 seeds of F1 were harvested by using the inter-generic hybridization in 2009 and 2010, 2 repeat, and 88 normal plants were obtained. The characteristics of leaves, stems and branches were the same as female for F1 generation, F2 generation, backcross generation and S1 generation, and there were some different characteristics with female which were flower colors, branching habit and plant height. A lodging-resistance plant was selected in F1, which was about 75 cm high, deep pink flower color and developed lateral branches. The DNA groups of each generation were separated by 1% agarose gel electrophoresis and there were not significant differences. Among the each generation many flower colors and forms were obtained.
3D Seismic Acquisition Technology and Effect in HX Volcanic Area in Liaohe Depression  [PDF]
Haibo Wang, Bing Liu, Qiwei Zou, Lizhi Sun, Wei Zhang, Jiantao Tian, Meibin Tang
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.77071
Abstract: Multi-stages volcanic are available in HX area, shielding the seismic waves. Previous seismic acquisitions of large size bin, less fold coverage and narrow azimuth result in indistinct fault images, low S/N ratio and the difficulty of multi-stages volcanic characterization. In reference to the successful experience of domestic and overseas volcanic exploration, the low frequency excitation and receiving, and survey with wide range, high coverage, wide azimuth should be paid more attention, associated with two-dimensional and three-dimensional wave equation forward modeling and real data processing contrast analysis method. The image of underlying strata and fault are remarkably improved in the new method, according to the processing results of new seismic data. The new method will provide technical reference for the similar volcanic development area in the future seismic acquisition design.
The Assessment of Soil Quality on the Arable Land in Yellow River Delta Combined with Remote Sensing Technology  [PDF]
Linlin Guo, Hanjie Hao, Yanghua Liu, Haibo Ma, Jingbo An, Qian Sun, Zhao Yang
World Journal of Engineering and Technology (WJET) , 2017, DOI: 10.4236/wjet.2017.55B003
Soil quality assessment is essential to improve the understanding of soil quality and make proper agricultural practices. However, soil quality assessments are extremely difficult to implement in a large-scale area, since they are time and labor consuming. Remote sensing technique gained more attention in plant and soil information monitoring recently for its high effi-ciency and convenience. But seldom studies tested the applicability of remote sensing techniques before implementing. This study conducted the soil quality assessment in a typical agricultural county in the Yellow River delta (Kenli). We found the soil quality in Kenli was dominantly in the low grade (71.85%), with deficient nutrient (SOM and TN), poor structure (high BD) and high EC. Salinity is the primary limiting factor for soil quality in Kenli, and adjustment of soil salinization through suitable farming practices such as organic fertilizers application, irrigation for leaching, and salt-tolerant crop planting is the key point for soil quality improvement. We obtained the normalized difference vegetation index (NDVI) of the study area by remote sensing technique, and found the high correlation between NDVI and soil quality indicator (SOM, TN and EC) and yield. The NDVI can help to study the soil conditions as a soil quality assessment indicator. More studies about the ap-plication of remote sensing technique on soil quality detecting are expected.
Electrical Removal Behavior of Carbon Nanotube and Carbon Nanofiber Film in CuCl2 Solution: Kinetics and Thermodynamics Study
Yankun Zhan,Chunyang Nie,Likun Pan,Haibo Li,Zhuo Sun
International Journal of Electrochemistry , 2011, DOI: 10.4061/2011/572862
Abstract: The kinetics, thermodynamics, and isotherms during electrical removal of Cu2+ by carbon nanotube and carbon nanofiber (CNT-CNF) electrodes in CuCl2 solution were studied under different solution temperatures, initial Cu2+ concentrations, and applied voltages. The result shows that Langmuir isotherm can describe experimental data well, indicating monolayer adsorption, and higher Cu2+ removal and rate constant are achieved at higher voltage, lower initial Cu2+ concentration, and higher solution temperature. Meanwhile, the thermodynamics analyses indicate that the electrical removal of Cu2+ onto CNT-CNF electrodes is mainly driven by a physisorption process. 1. Introduction Cupric ions (Cu2+) commonly exist in the waste water of several industries such as acid mine waste and acidic corrosion of pipes. The presence of excessive amounts of Cu2+ in drinking water may lead to accumulation in the liver and may cause gastrointestinal problems [1]. Therefore, the elimination of Cu2+ from water is of great importance to public health. Compared with conventional methods such as oxidation or reduction, precipitation, membrane filtration and ion exchange, electrosorption, defined as adsorption on the surface of charged electrode by applying potential or current, has been shown to be a more efficient and energy saving method to remove ions including Cu2+ from water since it is conducted at ambient conditions and low voltages with no secondary waste and requires no membranes, distillation columns, or thermal heaters [2–10]. Some researchers have successfully employed electrosorption to remove Cu2+ from solution. Oda and Nakagawa [11] investigated the removal of Cu2+ and Zn2+ using activated carbon electrodes by applying a direct voltage of 1?V. Huang and Su [12] studied the electrosorption of Cu2+ using activated carbon fiber cloth electrodes by imposing a low voltage of 0.3?V. Ying et al. [13] studied the electrosorption of different ions from aqueous solutions using nanostructured carbon aerogel and found a strong specific adsorption for Cu2+ ions. In our previous studies [14], carbon nanotube and carbon nanofiber (CNT-CNF) electrodes had been successfully used to perform the electrical removal of Cu2+ ions and the difficulty of their regeneration due to the electrodeposition reaction on the surface had been solved by combining reverse voltage and short circuit. When applied voltage is more than the electrodeposition potential of Cu2+, the electrodeposition reaction will happen together with electrosorption of Cu2+ ions. The term “electrical removal” is used here
Beneficial Metabolic Effects of 2′,3′,5′-tri-acetyl-N6- (3-Hydroxylaniline) Adenosine in the Liver and Plasma of Hyperlipidemic Hamsters
Yang Sun, Zeqin Lian, Chunying Jiang, Yinghong Wang, Haibo Zhu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0032115
Abstract: Background Pharmaceutical research of hyperlipidemia has been commonly pursued using traditional approaches. However, unbiased metabonomics attempts to explore the metabolic signature of hyperlipidemia in a high-throughput manner to understand pathophysiology of the disease process. Methodology/Principal Findings As a new way, we performed 1H NMR-based metabonomics to evaluate the beneficial effects of 2′,3′,5′-tri-acetyl-N6- (3-hydroxylaniline) adenosine (WS070117) on plasma and liver from hyperlipidemic Syrian golden hamsters. Both plasma and liver profiles provided a clearer distinction between the control and hyperlipidemic hamsters. Compared to control animals, hyperlipidemic hamsters showed a higher content of lipids (triglyceride and cholesterol), lactate and alanine together with a lower content of choline-containing compounds (e.g., phosphocholine, phosphatidylcholine, and glycerophosphocholine) and betaine. As a result, metabonomics-based findings such as the PCA and OPLS-DA plotting of metabolic state and analysis of potential biomarkers in plasma and liver correlated well to the assessment of biochemical assays, Oil Red O staining and in vivo ultrasonographic imaging suggesting that WS070117 was able to regulate lipid content and displayed more beneficial effects on plasma and liver than simvastatin. Conclusions/Significance This work demonstrates the promise of applying 1H NMR metabonomics to evaluate the beneficial effects of WS070117 which may be a good drug candidate for hyperlipidemia.
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