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Search Results: 1 - 10 of 61045 matches for " Kuai Yu "
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G-parking functions and tree inversions
David Perkinson,Qiaoyu Yang,Kuai Yu
Mathematics , 2013,
Abstract: A depth-first search version of Dhar's burning algorithm is used to give a bijection between the parking functions of a graph and labeled spanning trees, relating the degree of the parking function with the number of inversions of the spanning tree. Specializing to the complete graph answers a problem posed by R. Stanley.
Facile solution-phase synthesis of γ-Mn3O4 hierarchical structures
Zhengcui Wu, Kuai Yu, Yaobin Huang, Cheng Pan, Yi Xie
Chemistry Central Journal , 2007, DOI: 10.1186/1752-153x-1-8
Abstract: The hierarchical structure of Mn3O4 with radiated spherulitic nanorods was prepared via a simple solution-based coordinated route in the presence of macrocycle polyamine, hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene (CT) with the assistance of thiourea as an additive.This approach opens a new and facile route for the morphogenesis of Mn3O4 material and it might be extended as a novel synthetic method for the synthesis of other inorganic semiconducting nanomaterials such as metal chalcogenide semiconductors with novel morphology and complex form, since it has been shown that thiourea can be used as an effective additive and the number of such water-soluble macrocyclic polyamines also makes it possible to provide various kinds of ligands for different metals in homogeneous water system.Recently, a lot of effort has been focused on the integration of nanorods/nanowire as building blocks into three-dimensional (3D) complex superstructures. There are a variety of methods for different materials to construct 3D superstructures, among which hierarchical α-MnO2, ZnO, CaCO3 nanostructures, penniform BaWO4 nanostructures and dandelion-like CuO nanostructures have been successfully prepared [1-5]. These results not only provide feasible ways to assemble 1D nanostructures for future microscale functional devices but also offer opportunities to explore their novel collective properties.Considerable research has focused on trimanganese tetroxide due to its catalytic and soft magnetic properties in recent years. It has been used as a catalyst for several processes, e.g., the oxidation of methane and carbon monoxide [6,7], the decomposition of nitrogenoxides [8], the selective reduction of nitrobenzene [9], and the catalytic combustion of organic compounds at temperatures of 373–773 K [10]. Mn3O4 is often synthesized by the high-temperature calcinations of manganese powders or manganese oxides with a higher valence of manganese, hydroxides, and hydroxyoxides, or oxysalts o
Current status and prospect of acupuncture-moxibustion in treatment of cancer pain: a review
Zhong Xi Yi Jie He Xue Bao , 2008,
Inhibition of AMPA receptor trafficking at hippocampal synapses by β-amyloid oligomers: the mitochondrial contribution
Yanfang Rui, Jiaping Gu, Kuai Yu, H Criss Hartzell, James Q Zheng
Molecular Brain , 2010, DOI: 10.1186/1756-6606-3-10
Abstract: We found that a brief exposure of hippocampal neurons to Aβ oligomers not only led to marked removal of AMPARs from postsynaptic surface but also impaired rapid AMPAR insertion during chemically-induced synaptic potentiation. We also found that Aβ oligomers exerted acute impairment of fast mitochondrial transport, as well as mitochondrial translocation into dendritic spines in response to repetitive membrane depolarization. Quantitative analyses at the single spine level showed a positive correlation between spine-mitochondria association and the surface accumulation of AMPARs. In particular, we found that spines associated with mitochondria tended to be more resistant to Aβ inhibition on AMPAR trafficking. Finally, we showed that inhibition of GSK3β alleviated Aβ impairment of mitochondrial transport, and effectively abolished Aβ-induced AMPAR loss and inhibition of AMPAR insertion at spines during cLTP.Our findings indicate that mitochondrial association with dendritic spines may play an important role in supporting AMPAR presence on or trafficking to the postsynaptic membrane. Aβ disruption of mitochondrial trafficking could contribute to AMPAR removal and trafficking defects leading to synaptic inhibition.Alzheimer's disease (AD) often attacks aged populations and is highlighted by progressive loss of memory and cognitive abilities [4]. AD brains exhibit two major pathological hallmarks: extracellular senile plaques containing β-amyloid aggregates and intracellular neurofibrillary tangles consisting of hyperphosphorylated microtubule-associated tau proteins [5,6]. β-amyloid (Aβ) molecules are generated by proteolytic cleavage of the transmembrane β-amyloid precursor protein (APP) [7,8]. Aggregated Aβ fibrils constitute the core of neuritic plaques and are believed to be a major culprit for neurodegeneration and subsequent cognitive abnormalities in AD patients [9-11]. Recent studies, however, indicate that Aβ molecules exert adverse effects on neuronal functions
Identification of a latent pathogen on mulberry tree with a disease of mosaic dwarf
J Fei, Y Li, Y Wu, X Bai, G Shi, F Yu, Y Kuai
African Journal of Biotechnology , 2009,
Abstract: A disease on mulberries with the typical symptoms of mosaic and dwarf leaves was found in middle areas of China in 1980s. Presently, this disease became serious and spread out. Based on previous finding, we detected a viroid-like small molecular RNA in diseased mulberries tissues. In this paper, we further identified the pathogen of mulberry mosaic dwarf disease (MMDD) according to the Koch's postulates and reported the diagnostic method of the pathogen by using PCR with two sets of specific primers. The result might be helpful to control the disease extension.
Mitochondrial uncoupling protein 2 expression in colon cancer and its clinical significance
Xiao-Yi Kuai, Ze-Yu Ji, Hong-Jie Zhang
World Journal of Gastroenterology , 2010,
Abstract: AIM: To detect the expression of mitochondrial uncoupling protein 2 (UCP2) in colon cancer and analyze the relation between UCP2 expression and clinical pathological features of colon cancer.METHODS: Fifteen colon tissue samples and 15 its adjacent tissue samples were obtained from colon cancer patients during surgical interventions. UCP2 expression was detected with immunohistochemical method in 10 normal controls, 10 hyperplastic polyp patients, 20 tubular adenoma patients and 78 colon cancer patients. Patients with rectal cancer were excluded. Quantitative reverse transcription polymerase chain reaction and Western blotting were used to detect UCP2 expressions in colon cancer tissue samples and its adjacent tissue samples. Relation between UCP2 expression and clinical pathological features of colon cancer was also analyzed.RESULTS: The UCP2 mRNA expression level was four-fold higher in colon cancer tissue samples than in its adjacent tissue samples. The UCP2 protein expression level was three-fold higher in colon cancer tissue samples than in its adjacent normal tissue samples. The UCP2 was mainly expressed in cytoplasm. The UCP2 was not expressed in normal colon mucosa. Strong positive staining for UCP2 with a diffuse distribution pattern was identified throughout the mucosa in colon cancer tissue samples with a positive expression rate of 85.9%. The UCP2 expression level was higher in colon cancer tissue samples at clinical stages III and IV than in those at stage I + II. Univariate analysis showed that the high UCP2 expression level was significantly correlated to colon cancer metastasis (hazard ratio = 4.321, confidence interval = 0.035-0.682, P = 0.046).CONCLUSION: UCP2 is highly expressed in human colon cancer tissue and may be involved in colon cancer metastasis.
Synthesis and Microwave Absorption of the Silica-coated Fe Nanocomposites
WANG Deng-Ke,HUANG Hao,YU Kuai,ZHANG Xue-Feng,DONG Xing-Long
无机材料学报 , 2009, DOI: 10.3724/sp.j.1077.2009.00340
Abstract: Silica-coated Fe nanocomposites were prepared by the DC arc plasma in a mixed atmosphere of hydrogen (H2) and argon (Ar). The phase structure, composition and morphology of silica-coated Fe nanocomposites were examined by X-ray diffraction(XRD), transmission electron microscope(TEM) and electron energy dispersive spectroscope(EDS). The results show that the mean size of silica-coated Fe nanocomposites is about 50nm, and the amorphous silica which cover BCC-Fe cores form nanorods with the length of 150-200nm. The growth mechanism of silicaa2coated Fe nanocomposites is governed by an extended vapora2liquida2solid mechanism and Fe nanoparticles acted as a catalyst for the growth of the nanorods. Its electromagnetic parameters are measured in the range from 2GHz to 18GHz. It is calculated that the maximum reflection loss of silica-coated Fe nanocomposites can reach -14.5dB at 15.4GHz with 1.79mm in thickness, and the bandwidth with a reflection loss less than -10dB is from 8-18GHz. The ina2depth study of relative complex permittivity and permeability reveals that the excellent microwave absorption properties are the consequence of a proper EM match in microstructure. And the loss mechanism is natural resonance, as the consequence of the increased surface anisotropic energy for nanosized particles.
Stimulus Coding Rules for Perceptual Learning
Jun-Yun Zhang,Shu-Guang Kuai,Lu-Qi Xiao,Stanley A. Klein,Dennis M. Levi,Cong Yu
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.0060197
Abstract: Perceptual learning of visual features occurs when multiple stimuli are presented in a fixed sequence (temporal patterning), but not when they are presented in random order (roving). This points to the need for proper stimulus coding in order for learning of multiple stimuli to occur. We examined the stimulus coding rules for learning with multiple stimuli. Our results demonstrate that: (1) stimulus rhythm is necessary for temporal patterning to take effect during practice; (2) learning consolidation is subject to disruption by roving up to 4 h after each practice session; (3) importantly, after completion of temporal-patterned learning, performance is undisrupted by extended roving training; (4) roving is ineffective if each stimulus is presented for five or more consecutive trials; and (5) roving is also ineffective if each stimulus has a distinct identity. We propose that for multi-stimulus learning to occur, the brain needs to conceptually “tag” each stimulus, in order to switch attention to the appropriate perceptual template. Stimulus temporal patterning assists in tagging stimuli and switching attention through its rhythmic stimulus sequence.
Synthesis and Microwave Absorption of the Silica-coated Fe Nanocomposites

WANG Deng-Ke,HUANG Hao,YU Kuai,ZHANG Xue-Feng,DONG Xing-Long,

无机材料学报 , 2009,
Abstract: 采用非平衡物理气相蒸发法在氢气-氩气混合气氛下制备了氧化硅包覆铁"壳/核"型纳米复合粒子.通过X射线衍射(XRD)、透射电子显微镜(TEM)和能谱分析(EDS)等方法表征了纳米复合粒子的相组分、结构以及颗粒形貌.结果表明,制备的氧化硅包覆铁纳米复合粒子的尺寸在50nm左右,在铁纳米粒子的表面还出现了非晶态的氧化硅纳米棒,长度为150~200nm.利用电磁参数模拟微波吸收特性得出,涂层厚度为1.79mm时,在15.4GHz频率处达到最小反射损耗值为-14.5dB,反射损耗在8~18GHz的频段低于-10dB,且损耗机制为自然共振.
Band Structures, Applications and Preparations of Photonic Crystals

KUAI Su-Lan,ZHANG Yu-zhi,HU Xing-Fang,

无机材料学报 , 2001,
Abstract: Photonic crystals are a new type of artificial materials with multi-dimensionally periodic dielectric structures. They can create a range of forbidden frequencies called photonic bandgap. Photons with energy lying in the gap cannot propagate through the medium. This has the fascinating prospect to shape and mould the flow of light for photonic information technology, and thus makes photonic crystals one of the hottest research fields nowadays. In this article the author will review the band structures, anticipated applications and preparation methods of photonic crystals.
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