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Search Results: 1 - 10 of 35702 matches for " Xiaodong Zhou "
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Effects of Cyclopentolate on Form Deprivation Myopia in Guinea Pigs  [PDF]
Tao Li, Xiaodong Zhou, Zhi Chen, Xingtao Zhou
Open Journal of Ophthalmology (OJOph) , 2015, DOI: 10.4236/ojoph.2015.51003
Abstract: Purpose: To investigate the effects of intravitreal injection of cyclopentolate on form deprivation myopia in guinea pigs. Methods: Thirty-five guinea pigs at age of 3 weeks were randomly divided into 5 groups (n = 7 for each group): deprived, deprived plus saline, deprived plus cyclopentolate, normal control, and cyclopentolate group. Form deprivation was only performed in right eyes with translucent membranes for 4 weeks. Physiological saline and cyclopentolate were intravitreally injected into deprived eyes at four-day intervals. All the left eyes remained untreated as group control. Refraction was measured by retinoscopy after cycloplegia. The axial dimensions were measured by A-scan ultrasound. Subsequently, retinal histology was observed by light microscopy. Results: After 4 weeks of treatment, intravitreal injection of cyclopentolate significantly reduced the degree of myopia in the deprived eyes (from -3.92 D to -0.86 D, P < 0.001), and retarded the increase of vitreous chamber depth (from 3.83 ± 0.06 mm to 3.70 ± 0.05 mm, P < 0.001) and axial length (from 8.42 ± 0.04 mm to 8.30 ± 0.05 mm, P < 0.001) in the deprived eyes. Histological ex-amination revealed no evidence of retinal damage of eyes injected with physiological saline or cy-clopentolate compared with normal control eyes. Conclusions: Intravitreal administration of cy-clopentolate reduces axial elongation of the deprived eyes in guinea pigs. Further investigations are required to identify the optimal dose.
Electron states of interfaces in multi-layered phthalocyanine films
Shuqin Zhou,Xiaodong Deng
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883815
Abstract: The interfaces and interface electron states in Mylar/Al/UCL/CGL/CTL multi-layered photoreceptor are discussed. The interface electron states between CGL and CTL in sample A efficiently accelerated photogeneration carrier transport processes to bring about a lower Vr value and higher light sensitivity than sample B. The process might be interpreted as a kind of assistance sensitization effect based on interfacial electron states in the high fields; that is to say, the interface electron states between CGL and CTL accelerated carriers injection from CGL into the gap states of CTL, and followed by the interface electron states modulated transport processes of carriers in the CTL.
A Subspace Method for Blind Channel Estimation in CP-free OFDM Systems
Xiaodong Yue, Xuefu Zhou
Signal Processing : An International Journal , 2011,
Abstract: In this paper, a subspace method is proposed for blind channel estimation in orthogonalfrequency-division multiplexing (OFDM) systems over time-dispersive channel. The proposedmethod does not require a cyclic prefix (CP) and thus leading to higher spectral efficiency. Byexploiting the block Toeplitz structure of the channel matrix, the proposed blind estimationmethod performs satisfactorily with very few received OFDM blocks. Numerical simulationsdemonstrate the superior performance of the proposed algorithm over methods reported earlier inthe literature.
Differential Harnack Estimates for Parabolic Equations
Xiaodong Cao,Zhou Zhang
Mathematics , 2010,
Abstract: Let $(M,g(t))$ be a solution to the Ricci flow on a closed Riemannian manifold. In this paper, we prove differential Harnack inequalities for positive solutions of nonlinear parabolic equations of the type $$\ppt f=\Delta f-f \ln f +Rf.$$ We also comment on an earlier result of the first author on positive solutions of the conjugate heat equation under the Ricci flow.
Cambering of Four High Cold Mill with the View of Reducing Roller Ends Contact and Preventing Complex Waves  [PDF]
Zhenhua Bai, Hongxin Si, Xiaodong Shi, Qingtian Zhou
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.34040
Abstract: Based on lots of field experiments and theoretical research, fully thinking the equipment and production craft characters of four high cold mill, a new cambering scheme for four high cold mill is advanced in this paper. This scheme considered the need of production of multi-specification products, as well as the control of roller ends contact. The most homogeneous transverse distribution of front tension is the control target and the homogeneous pressure distribution between rollers is the constraint condition. In this technology, working roll curve adapt the combination of cosine curve and high order curve, backup roll adapt the combination of cosine curve, straight line and high order curve. The cosine subentry of working roll and the high order curve subentry are used to control edge wave, the high order curve subentry of working roll is used to control the roll contact, the cosine subentry of backup roll is used to reduce the center wave. That’s the features of this technology. On-site testing shows that the new cambering and combination can not only manage the complex waves of normal four high cold mill effectively, but also will reduce the contact between roller ends and minish roll consumption. This technology has created economic benefits for enterprises.
Clinical Types and Outcome of Minor Ischemic Stroke in Northern China: A Retrospective Cohort Study  [PDF]
Guangsheng Wang, Daoming Tong, Xiaodong Chen, Tonghui Yang, Yeting Zhou
World Journal of Neuroscience (WJNS) , 2017, DOI: 10.4236/wjns.2017.71009
Abstract: Background: As a common and high incidence of disease, the minor ischemic stroke (MIS) has become an important public health problem. The aim of this study was to address whether patients with MIS have different types and outcome in the elderly in northern China. Methods: A retrospective cohort of consecutive patients was selected for study; all registered neurologic outpatients of the tertiary teaching hospital in northern Jiangsu, China between February, 2011 and February, 2012. A total of 433 outpatients, clinically only having had an initial visit and a MRI study of the brain, were enrolled. Results: Of 433 outpatients, 247 (57.0%) patients with MIS were diagnosed. The clinical types of MIS included stable MIS in 58.3%, acute progressive MIS in 5.3%, and chronic progressive MIS in 36.4% of patients. After adjusted Odd ratio (OR), only aged (OR, 1.0; 95% confidence interval [CI], 1.007 - 1.087, p = 0.021), episode duration (OR, 1.8; 95% CI, 1.011 - 1.024, p = 0.001), initial number of MIS (OR, 1.1; 95% CI, 1.047 - 1.207, p = 0.001), and infarcts volume (OR, 1.8; 95% CI, 1.253 - 2.681, p = 0.002) were independently associated with stable MIS and progressive MIS. Total survival was favorable among groups (p = 0.094), but the followed mRS score was significantly higher among those progressive MIS than those stable MIS (2.3 ± 1.0 vs 0.1 ± 0.3, p < 0.001). Conclusion: MIS had a very high prevalence and different clinical types. Stable MIS is a benign stroke, whereas those progressive MIS may have long-term instability or acute and chronic progressive trend. This information is important in prospectively determining outcome of MIS and in patient treatment.
Learning Multi-Modality Features for Scene Classification of High-Resolution Remote Sensing Images  [PDF]
Feng’an Zhao, Xiongmei Zhang, Xiaodong Mu, Zhaoxiang Yi, Zhou Yang
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.611018
Abstract:
Scene classification of high-resolution remote sensing (HRRS) image is an important research topic and has been applied broadly in many fields. Deep learning method has shown its high potential to in this domain, owing to its powerful learning ability of characterizing complex patterns. However the deep learning methods omit some global and local information of the HRRS image. To this end, in this article we show efforts to adopt explicit global and local information to provide complementary information to deep models. Specifically, we use a patch based MS-CLBP method to acquire global and local representations, and then we consider a pretrained CNN model as a feature extractor and extract deep hierarchical features from full-connection layers. After fisher vector (FV) encoding, we obtain the holistic visual representation of the scene image. We view the scene classification as a reconstruction procedure and train several class-specific stack denoising autoencoders (SDAEs) of corresponding class, i.e., one SDAE per class, and classify the test image according to the reconstruction error. Experimental results show that our combination method outperforms the state-of-the-art deep learning classification methods without employing fine-tuning.
Characteristic Analysis and Comprehensive Control for the Horizontal Stripes of High-Grade Automotive Panels in Continuous Annealing  [PDF]
Zhenhua Bai, Xiaodong Shi, Yanzhi Shen, Hongxin Si, Li Zhou, Shunbing Yu
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.32012
Abstract: As to the horizontal stripes defect which exist on the surface of the high-grade automotive panels in continuous annealing process, an effective comprehensive control method is proposed on the basis of full consideration of the equipment and technological features of continuous annealing line. With five field tests as basis, the generation mechanism of the defect was analysised in detail and the comprehensive control measures were put forward. According to actual situation, a detailed technical plan was worked out .Then the relevant technologies were applied to a 1850 continuous annealing line. The statistics shows that this program acquired good effects. The incidence of horizontal stripes defect decreased from 100% to 2.78%. Meanwhile, the surface quality of strip also improved effectively, which created a larger economic benefit.
Effect of Sisal Fiber Surface Treatment on Properties of Sisal Fiber Reinforced Polylactide Composites
Zhaoqian Li,Xiaodong Zhou,Chonghua Pei
International Journal of Polymer Science , 2011, DOI: 10.1155/2011/803428
Abstract: Mechanical properties of composites are strongly influenced by the quality of the fiber/matrix interface. The objective of this study was to evaluate the mechanical properties of polylactide (PLA) composites as a function of modification of sisal fiber with two different macromolecular coupling agents. Sisal fiber reinforced polylactide composites were prepared by injection molding, and the properties of composites were studied by static/dynamic mechanical analysis (DMA). The results from mechanical testing revealed that surface-treated sisal fiber reinforced composite offered superior mechanical properties compared to untreated fiber reinforced polylactide composite, which indicated that better adhesion between sisal fiber and PLA matrix was achieved. Scanning electron microscopy (SEM) investigations also showed that surface modifications improved the adhesion of the sisal fiber/polylactide matrix. 1. Introduction With the increasing of environmental protection consciousness, natural fibers as a group of environmental friendly reinforcements are in considerable demand in composites [1, 2]. Natural fibers such as flax, hemp, sisal, nettle and jute were the most common reinforced elements [2, 3]. Of course, natural fiber reinforced degradable polymers composite is likely more ecofriendly because that the reinforcement and the matrix (e.g., polylactide (PLA)) are readily biodegradable and such biocomposites are sometimes termed “green composites” [4, 5]. Natural fibers as reinforcement are familiar. However, there is also a major drawback associated with its application for reinforcement of polymeric matrices. The presence of hydroxyl and other polar groups in natural fibers constituents makes them exhibit high hydrophilic nature, which leads to incompatibility and poor wettability in a hydrophobic polymer matrix, and weak bonding in the fiber/matrix interface [6]. Herewith, there are many problems in dealing with the interface of natural fiber and polylactide. Several approaches have been studied, such as surface modification of cellulose (e.g., esterification of cellulose and graft copolymerization onto cellulose substrates) and the use of some compatibilizers (e.g., maleated polylactide and isocyanate [7–11]). Nevertheless, only a limited number of studies had achieved good results. And there is no commercial sale of such interfacial compatibilizers in the market. Among the various natural fibers, sisal fiber is fairly coarse and inflexible. It possesses moderately high specific strength and stiffness, durability, ability to stretch, and resistance to
A Common Model for Cytokine Receptor Activation: Combined Scissor-Like Rotation and Self-Rotation of Receptor Dimer Induced by Class I Cytokine
Xiaodong Pang,Huan-Xiang Zhou
PLOS Computational Biology , 2012, DOI: 10.1371/journal.pcbi.1002427
Abstract: The precise mechanism by which the binding of a class I cytokine to the extracellular domain of its corresponding receptor transmits a signal through the cell membrane remains unclear. Receptor activation involves a cytokine-receptor complex with a 1:2 stoichiometry. Previously we used our transient-complex theory to calculate the rate constant of the initial cytokine-receptor binding to form a 1:1 complex. Here we computed the binding pathway leading to the 1:2 activation complex. Three cytokine systems (growth hormone, erythropoietin, and prolactin) were studied, and the focus was on the binding of the extracellular domain of the second receptor molecule after forming the 1:1 complex. According to the transient-complex theory, translational and rotation diffusion of the binding entities bring them together to form a transient complex, which has near-native relative separation and orientation but not the short-range specific native interactions. Subsequently conformational rearrangement leads to the formation of the native complex. We found that the changes in relative orientations between the two receptor molecules from the transient complex to the 1:2 native complex are similar for the three cytokine-receptor systems. We thus propose a common model for receptor activation by class I cytokines, involving combined scissor-like rotation and self-rotation of the two receptor molecules. Both types of rotations seem essential: the scissor-like rotation separates the intracellular domains of the two receptor molecules to make room for the associated Janus kinase molecules, while the self-rotation allows them to orient properly for transphosphorylation. This activation model explains a host of experimental observations. The transient-complex based approach presented here may provide a strategy for designing antagonists and prove useful for elucidating activation mechanisms of other receptors.
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