OALib Journal期刊

ISSN: 2333-9721




2018 ( 3 )

2017 ( 98 )

2016 ( 90 )

2015 ( 911 )


匹配条件: “ Yandong Zhao” ,找到相关结果约34800条。
Automatic Irrigation System Using Android  [PDF]
Souvanxay Lorvanleuang, Yandong Zhao
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104503
Laos is an agricultural based country. As agriculture is the main source of food for any country, it is important to have a proper irrigation system. This paper shows a design of automatic irrigation system based on android application using Raspberry Pi microcontroller, soil moisture and temperature sensor to help a famer to control and monitor a farm. This work facilitates the farm irrigation by switching the pump motor ON/OFF through android cell phone. This automatic irrigation system has a low cost and can be affordable by many Lao farmers. The study shows that the system is useful to provide optimal amount of water for increase the productivity of crop.
Approximate design of optimal tracking controller for time-delay systems
Gongyou Tang,Chao Li,Yandong Zhao
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2052-x
Abstract: Successive approximate design of the optimal tracking controller for linear systems with time-delay is developed. By applying the successive approximation theory of differential equations, the two-point boundary value (TPBV) problem with both time-delay and time-advance terms derived from the original optimal tracking control (OTC) problem is transformed into a sequence of linear TPBV problems without delay and advance terms. The solution sequence of the linear TPBV problems uniformly converges to the solution of the original OTC problem. The obtained OTC law consists of analytic state feedback terms and a compensation term which is the limit of the adjoint vector sequence. The compensation term can be obtained from an iteration formula of adjoint vectors. By using a finite term of the adjoint vector sequence, a suboptimal tracking control law is revealed. Numerical examples show the effectiveness of the algorithm.
Dynamic Response Analysis of Beams with Oblique Collision  [PDF]
Junping Pu, Yandong Chi
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.37095
Abstract: Adopting a dynamic contact numerical method, some problems such as the central collision, transverse collision and oblique collision between two beams are researched. Numerical expressions for these cases are deduced. Using a self-developed finite element program some examples are computed, and compared with the analytical solution of the central collision, this numerical algorithm is proved to be reliable. For the other numerical results that have no analytical solution to be used to compare with, they are also reasonable through the theoretical analysis. For the transverse and oblique collision, the ideal results can be obtained by using a smaller time step.
Optimal Planning of Charging Station for Phased Electric Vehicle  [PDF]
Yajing Gao, Yandong Guo
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B264

Construction of electric vehicle charging station is the premise of the popularity of electric vehicles. In this paper, electric vehicle charging facilities planning is divided into two stages: public demonstration stage and commercial operation stage. In public demonstration stage, This Paper applies maximal covering model into charging station location, and then be solved by the branch and bound method. In commercial operation stage, the charging station’s service areas division is studied based on Voronoi diagram. With the concerning technical restrains, an optimal planning method is presented for newly-increased station positioning and service region division. The method using the most greatly air circuit method and local dynamic characteristics of Voronoi diagram guarantees the reasonable distribution of stations. Then charging station model of optimal load allocation is established by using M/M/c model. In the end, the correctness and validity of the model is verified through simulation of charging station planning.

Yandong Wu,Yichong Sun
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809024118
Abstract: In the title molecule, C24H26Cl2N6S2, the two phenyl rings form a dihedral angle of 51.95 (7)° and the distance between their centroids is 4.156 (8) . The crystal packing exhibits weak intermolecular C—H...S and C—H...N hydrogen bonds.
MT2 to the Rescue -- Searching for Sleptons in Compressed Spectra at the LHC
Zhenyu Han,Yandong Liu
Physics , 2014, DOI: 10.1103/PhysRevD.92.015010
Abstract: We propose a novel method for probing sleptons in compressed spectra at hadron colliders. The process under study is slepton pair production in R-parity conserving supersymmetry, where the slepton decays to a neutralino LSP of mass close to the slepton mass. In order to pass the trigger and obtain large missing energy, an energetic mono-jet is required. Both leptons need to be detected in order to suppress large standard model backgrounds with one charged lepton. We study variables that can be used to distinguish the signal from the remaining major backgrounds, which include tt, WW+jet, Z+jet, and single top production. We find that the dilepton MT2, bound by the mass difference, can be used as an upper bound to efficiently reduce the backgrounds. It is estimated that sleptons with masses up to about 150 GeV can be discovered at the 14 TeV LHC with 100/fb integrated luminosity.
Message passing with relaxed moment matching
Yuan Qi,Yandong Guo
Computer Science , 2012,
Abstract: Bayesian learning is often hampered by large computational expense. As a powerful generalization of popular belief propagation, expectation propagation (EP) efficiently approximates the exact Bayesian computation. Nevertheless, EP can be sensitive to outliers and suffer from divergence for difficult cases. To address this issue, we propose a new approximate inference approach, relaxed expectation propagation (REP). It relaxes the moment matching requirement of expectation propagation by adding a relaxation factor into the KL minimization. We penalize this relaxation with a $l_1$ penalty. As a result, when two distributions in the relaxed KL divergence are similar, the relaxation factor will be penalized to zero and, therefore, we obtain the original moment matching; In the presence of outliers, these two distributions are significantly different and the relaxation factor will be used to reduce the contribution of the outlier. Based on this penalized KL minimization, REP is robust to outliers and can greatly improve the posterior approximation quality over EP. To examine the effectiveness of REP, we apply it to Gaussian process classification, a task known to be suitable to EP. Our classification results on synthetic and UCI benchmark datasets demonstrate significant improvement of REP over EP and Power EP--in terms of algorithmic stability, estimation accuracy and predictive performance.
Polarization effect of zinc on the region 1-16 of amyloid-beta peptide: a molecular dynamics study
Yandong Huang,Jianwei Shuai
Quantitative Biology , 2013,
Abstract: Zinc is found saturated in the deposited Amyloid-beta (AB) peptide plaques in brains of patients subjected to Alzheimer disease (AD). Zinc binding to AB promotes aggregations, including the toxic soluble AB species. Up to now, only the region 1-16 of AB complexed with Zinc (AB16-Zn) is defined structurally in experiment, requiring an efficient theoretical method to present the interaction between zinc and AB peptide. In order to explore the induced polarization effect on the global conformation fluctuations and the experimentally observed coordination mode of AB16-Zn, in this work we consider an all-atom molecular dynamics (MD) of AB16-Zn solvated in implicit water. In our model the polarization effect affects the whole peptide is applied. The induced dipoles are divided into three distinct scales according to their distances from zinc. Besides, the atomistic polarizability on the coordinating sidechains is rescaled to describe the electron redistribution effect. As a comparison, another model which exactly follows the method of Sakharov and Lim (J. Am. Chem. Soc., 127, 13, 2005) has been discussed also. We show that, associated with proper van der Waals (vdW) parameters, our model not only obtains the reasonable coordinating configuration of zinc binding site, but also retains the global stabilization, especially the N-terminal region, of the AB16-Zn. We suggest that it is the induced polarization effect that promotes reasonable solvent exposures of hydrophobic/hydrophilic residues regarding zinc-induced AB aggregation.
Soil Moisture and Its Distribution Characteristics at Shaliuhe Town in North Qinghai Lake

ZHAO Jingbo,MA Shumiao,MA Yandong,WEI Junping,

资源科学 , 2012,
Abstract: The Qinghai Lake area is sensitive to climatic changes and has fragile ecological environment.This paper aims at researching on soil moisture distribution and soil granularity,evaluating the storage and regulating capacity of soil reservoir,analyzing the types of water cycle and vegetations suitable for developing and providing theoretical basis for husbandry production,vegetation construction and policy formulation around the Qinghai Lake.With soil samples collected at Shaliuhe Town in the north of Qinghai Lake,we have analyzed the characteristics of soil moisture distribution and soil granularity based on the measurement of soil moisture content and soil granularity.The results show that with the increasing depth of water in the north of Qinghai Lake,the soil moisture decreases and the degree of the dried soil layer aggravates;the soil moisture distribution in this area is extremely special because the soil moisture is high in the upper soil layer while low and seriously inadequate in the lower;the soil particle size is mainly coarse silt slightly bigger than that at Loess Plateau;soil moisture below 0.6m is less than 11%,which shows that the desiccation of soil layer is significant and the precipitation doesn’t participate in groundwater circulation resulting in forming the soil-atmosphere moisture cyclic model.In addition,due to small soil thickness,low capacity of soil reservoir,little storage capacity and poor hydrological adjusting functions,the ecological environment is fragile in this area and grassland degradation easily occurs in drought years.Moreover,because of the long freezing period of soil layer and the phenomenon that low temperature results in the poor evapotranspiration,soil moisture is mainly distributed in the upper soil layer.In summary,this region is favorable to develop shallow-rooted grassland vegetations and little water-consumption grassland vegetations but not suitable for developing the plants of high water consuming intensity or arbor and bush vegetations.
Urotensin II Promotes Atherosclerosis in Cholesterol-Fed Rabbits
Yafeng Li, Sihai Zhao, Yanli Wang, Yulong Chen, Yan Lin, Ninghong Zhu, Huadong Zheng, Min Wu, Daxing Cheng, Yandong Li, Liang Bai, Jianglin Fan, Enqi Liu
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0095089
Abstract: Urotensin II (UII) is a vasoactive peptide composed of 11 amino acids that has been implicated to contribute to the development of cardiovascular disease. The purpose of this study was to investigate whether UII affects the development of atherosclerosis in cholesterol-fed rabbits. UII was infused for 16 weeks through an osmotic mini-pump into male Japanese White rabbits fed on a high-cholesterol diet. Plasma lipids and body weight were measured every 4 weeks. Aortic atherosclerotic lesions along with cellular components, collagen fibers, matrix metalloproteinase-1 and -9 were examined. Moreover, vulnerability index of atherosclerotic plaques was evaluated. UII infusion significantly increased atherosclerotic lesions within the entire aorta by 21% over the control (P = 0.013). Atherosclerotic lesions were increased by 24% in the aortic arch (P = 0.005), 11% in the thoracic aorta (P = 0.054) and 18% in the abdominal aorta (P = 0.035). These increases occurred without changes in plasma levels of total cholesterol, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, triglycerides or body weight. Immunohistochemical staining revealed that macrophages and matrix metalloproteinase-9 were significantly enhanced by 2.2-fold and 1.6-fold in UII group. In vitro studies demonstrated that UII up-regulated the expression of vascular cell adhesion protein-1 and intercellular adhesion molecule-1 in human umbilical vein endothelial cells, which was inhibited by the UII receptor antagonist urantide. In conclusion, our results showed that UII promotes the development of atherosclerotic lesions and destabilizes atherosclerotic plaques in cholesterol-fed rabbits.

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