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Search Results: 1 - 10 of 72709 matches for " YANG Qi "
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Equations for the third secant variety of the Segre product of n projective spaces
Yang Qi
Mathematics , 2013,
Abstract: We determine set theoretic defining equations for the third secant variety of the Segre product of $n$ projective spaces, and from the proof of the main statement we derive an upper bound for the degrees of these equations.
Tribological Behavior of Stellite 720 Coating under Block-on-Ring Wear Test  [PDF]
Rong Liu, Qi Yang, Feng Gao
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.311110
Abstract: Stellite 720 is a high-carbon Co-Cr-Mo alloy, designed for severe wear/corrosion environments. This article presents a study of the Stellite 720 coating on stainless steel 304 under block-on-ring wear test. The coating is deposited through a slurry/powder metallurgy sintering process. Micro-hardness indentation test is conducted on the cross section of the coating specimen to investigate the hardness of individual phases of the coating material and the dilution effect of the substrate material on the coating layer. The tribological behavior of the coating under low and high load wear is investigated. The worn surfaces of the coating specimens are analyzed using a Philips XL30S FEG scanning electron micro- scope (SEM) with an EDAX energy dispersive X-ray (EDX) spectroscopy system. The experimental results are discussed to explore the wear mechanisms of the Stellite 720 coating under block-on-ring wear.
Gender Differences in Neural Mechanisms Underlying Moral Judgment of Disgust: A Functional MRI Study  [PDF]
Juan Yang, Lili Guan, Mingming Qi
Journal of Behavioral and Brain Science (JBBS) , 2014, DOI: 10.4236/jbbs.2014.45023
Abstract: Much recent research has sought to uncover the gender difference in neural mechanism of moral judgment; however, very few researches study the neural gender differences in a specific area of moral judgment. The aim of this functional magnetic resonance imaging (fMRI) study was to examine possible gender difference in neural response to (sexual) disgusting pictures versus neutral pictures. Seventeen participants (9 males) were scanned while viewing pictures of tactile intimacy in same-sex and being asked to evaluate whether the behaviors between the stimulus persons in the pictures were morally appropriate or not. Both the neural responses to pictures of tactile intimacy in same-sex between male participants and female participants and the neural response to pictures of male-male tactile intimacy and to pictures of female-female tactile intimacy were examined. The results showed that significantly increased differential activations to the disgusting pictures relative to the neutral pictures were observed in the dorsal medial prefrontal cortex (BA 9) and amygdala. Furthermore, greater activation to the pictures of female-female tactile intimacy was observed in the left superior frontal gyrus/dorsal medial prefrontal cortex (BA 6). These results suggested a possible neural gender difference between female’s immoral behavior and male’s immoral behavior.
Computation of Structure Activity and Design of Chalcone Derivatives  [PDF]
Yan Jiang, Qi Yang, Shuping Zhang
Computational Chemistry (CC) , 2019, DOI: 10.4236/cc.2019.72004
Abstract: Based on the antitumor activity of chalcone derivatives and their structure, the structure-activity relationship of chalcone derivatives was analyzed by CoMFA (comparative molecular field analysis) method and then the 3D-QSAR (the three dimensional quantitative structures activity relationship) model was established. The analytical results showed that the model had good stability and prediction ability with cross-validated Q2 and non-cross-validated R2 values of 0.527 and 0.995, respectively. The contour map of the model explained the relationship between the structure of chalcone derivatives and antitumor activity, and could be analyzed to design antitumor chalcone derivatives. We designed some structure of chalcone derivatives and calculated their antitumor activity. In this paper, 24 chalcone derivatives were studied by CoMFA, 3D-QSAR, molecular design, which provided theoretical for designing good activities chalcone derivatives.
Feature-Based Image Comparison for Semantic Neighbor Selection in Resource-Constrained Visual Sensor Networks
Bai Yang,Qi Hairong
EURASIP Journal on Image and Video Processing , 2010,
Abstract: Visual Sensor Networks (VSNs), formed by large number of low-cost, small-size visual sensor nodes, represent a new trend in surveillance and monitoring practices. Sensor collaboration is essential to VSNs and normally performed among sensors having similar measurements. The directional sensing characteristics of imagers and the presence of visual occlusion present unique challenges to neighborhood formation, as geographically-close neighbors might not monitor similar scenes. In this paper, we propose the concept of forming semantic neighbors, where collaboration is only performed among geographically-close nodes that capture similar images, thus requiring image comparison as a necessary step. To avoid large amount of data transfer, we propose feature-based image comparison as features provide more compact representation of the image. The paper studies several representative feature detectors and descriptors, in order to identify a suitable feature-based image comparison system for the resource-constrained VSN. We consider two sets of metrics from both the resource consumption and accuracy perspectives to evaluate various combinations of feature detectors and descriptors. Based on experimental results obtained from the Oxford dataset and the MSP dataset, we conclude that the combination of Harris detector and moment invariants presents the best balance between resource consumption and accuracy for semantic neighbor formation in VSNs.
Feature-Based Image Comparison for Semantic Neighbor Selection in Resource-Constrained Visual Sensor Networks
Yang Bai,Hairong Qi
EURASIP Journal on Image and Video Processing , 2010, DOI: 10.1155/2010/469563
Abstract:
Expression and Significance of Raf Kinase Inhibitory Protein in Lung Cancer
Dayun YANG,Zhan QI
Chinese Journal of Lung Cancer , 2012, DOI: 10.3779/j.issn.1009-3419.2012.10.06
Abstract: Background and objective Raf kinase inhibitory protein (RKIP) belongs to the phosphatidylethanolamine binding protein family. RKIP is an endogenous inhibitor of the ERK/MAPK, NF-κΒ, and G protein-coupled receptor signaling pathways. This study aims to investigate the expression of RKIP in non-small cell lung cancer (NSCLC) and to determine the association of RKIP expression with the clinicopathologic features of NSCLC. Methods Reverse transcription-polymerase chain reaction, Western blot, and immunohistochemistry were used to detect RKIP expression in 83 specimens with NSCLC and normal lung tissues and to analyze the association of RKIP expression with the clinicopathologic features of NSCLC. All cases were confirmed by pathological diagnosis, and primary tumors were not found at other sites. No medical records of preoperative radiotherapy, chemotherapy, and immunotherapy were found in the groups. Results RKIP expression was down-regulated significantly in NSCLC compared with adjacent cancer tissues (P<0.05). It was associated with differentiation, pathological tumor-node-metastasis stage, survival time, and lympho invasion (P<0.05) but not with gender, smoking status, age, tumor size, and histologic type (P>0.05). Conclusion The deficiency of RKIP expression is positively correlated with carcinogenesis and invasion metastasis of NSCLC. RKIP is a potential marker and target for clinic therapy.
The Earliest Fleshy Cone of Ephedra from the Early Cretaceous Yixian Formation of Northeast China
Yong Yang, Qi Wang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0053652
Abstract: Bracts of female cones of extant gymnosperm Ephedra (Joint fir) are either colorful and fleshy (section Ephedra), or dry-winged and membranous (section Alatae), or dry and coriaceous (section Asarca), which have played a crucial role in long-distance seed dispersal that is responsible for a wide distribution of the genus in semiarid and arid areas of Eurasia, North Africa, North America, and South America. Recent molecular systematic studies on Ephedra have suggested that the fleshy bracts in character evolution may be plesiomorphic relative to the dry, membranous and coriaceous bracts. However, little is known about when the fleshy bracts of Ephedra have made their debut in the geological past. Herein, we describe a novel, fleshy bract-bearing female cone macrofossil from the Early Cretaceous (ca. 120—125 Ma) Yixian Formation in Liaoning, northeastern China. This cone bears three ellipsoid seeds subtended by only one whorl of fleshy bracts. Each seed has a thin outer envelope and an inner integument that extends upward and passes through the opening of the outer envelope, forming a thin and straight micropylar tube. Such a syndrome shows the closest similarity to an extant triovulate species Ephedra intermedia in the section Ephedra, but the latter bears a whorl of terminal fertile bracts and more than one whorl of inferior sterile bracts, and a thick outer envelope. Hence, we establish a new fossil species Ephedra carnosa. Our discovery provides the first direct macrofossil evidence for the previous molecular systematics of Ephedra, implying that the origin of fleshy bracts in Ephedra should not have been later than that of the membranous and coriaceous bracts by at least the Early Cretaceous.
Effective theory of Fermi pockets in fluctuating antiferromagnets
Yang Qi,Subir Sachdev
Physics , 2009, DOI: 10.1103/PhysRevB.81.115129
Abstract: We describe fluctuating two-dimensional metallic antiferromagnets by transforming to a rotating reference frame in which the electron spin polarization is measured by its projections along the local antiferromagnetic order. This leads to a gauge-theoretic description of an `algebraic charge liquid' involving spinless fermions and a spin S=1/2 complex scalar. We propose a phenomenological effective lattice Hamiltonian which describes the binding of these particles into gauge-neutral, electron-like excitations, and describe its implications for the electron spectral function across the entire Brillouin zone. We discuss connections of our results to photoemission experiments in the pseudogap regime of the cuprate superconductors.
Global Phase Diagram for Magnetism and Lattice Distortion of Fe-pnictide Materials
Yang Qi,Cenke Xu
Physics , 2008, DOI: 10.1103/PhysRevB.80.094402
Abstract: We study the global phase diagram of magnetic orders and lattice structure in the Fe-pnictide materials at zero temperature within one unified theory, tuned by both doping and pressure. On the low doping and high pressure side of the phase diagram, there is one single transition, which is described by a $z=2$ mean field theory with very weak run-away flows; on the high doping and low pressure side the transition is expected to split to two transitions, with one O(3) spin density wave transition followed by a z = 3 quantum Ising transition at larger doping. The fluctuation of the strain field fluctuation of the lattice will not affect the spin density wave transition, but will likely drive the Ising nematic transition more mean field like through a linear coupling, as observed experimentally in BaFe_2-xCo_xAs_2.
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