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Search Results: 1 - 10 of 42694 matches for " Junyan Xu "
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Survey on fusible numbers
Junyan Xu
Mathematics , 2012,
Abstract: We point out that the recursive formula that appears in Erickson's presentation "Fusible Numbers" is incorrect, and pose an alternate conjecture about the structure of fusible numbers. Although we are unable to solve the conjecture, we succeed in establishing some basic properties of fusible numbers. We suggest some possible approaches to the conjecture, and list further problems in the final chapter.
A Vehicle Detection Method for Aerial Image Based on YOLO  [PDF]
Junyan Lu, Chi Ma, Li Li, Xiaoyan Xing, Yong Zhang, Zhigang Wang, Jiuwei Xu
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.611009
With the application of UAVs in intelligent transportation systems, vehicle detection for aerial images has become a key engineering technology and has academic research significance. In this paper, a vehicle detection method for aerial image based on YOLO deep learning algorithm is presented. The method integrates an aerial image dataset suitable for YOLO training by pro-cessing three public aerial image datasets. Experiments show that the training model has a good performance on unknown aerial images, especially for small objects, rotating objects, as well as compact and dense objects, while meeting the real-time requirements.
Permanence and Global Attractivity of a Delayed Discrete Predator-Prey System with General Holling-Type Functional Response and Feedback Controls
Lijuan Chen,Junyan Xu,Zhong Li
Discrete Dynamics in Nature and Society , 2008, DOI: 10.1155/2008/629620
Abstract: This paper discusses a delayed discrete predator-prey system with general Holling-type functional response and feedback controls. Firstly, sufficient conditions are obtained for the permanence of the system. After that, under some additional conditions, we show that the periodic solution of the system is global stable.
LED Light-Activated Hypocrellin B Induces Mitochondrial Damage of Ovarian Cancer Cells
Yuan Jiang,Albert Wingnang Leung,Junyan Xiang,Chuanshan Xu
International Journal of Photoenergy , 2012, DOI: 10.1155/2012/186752
Abstract: Objective. Hypocrellin is a natural photosensitizer from a traditional Chinese herb. In the present study, our aim is to investigate the effect of LED light-activated hypocrellin B on mitochondria of ovarian cancer cells. Material and Methods. Ovarian cancer HO-8910 cells were incubated with hypocrellin B at the concentration of 2.5?μM for 5?h and then irradiated by blue light from a novel LED source. Cell survival rate of HO-8910 cells was measured using MTT assay 24?h after photodynamic treatment of hypocrellin B. Mitochondrial morphology was observed using transmission electron microscopy (TEM). Mitochondrial membrane potential was measured using flow cytometry with JC-1 staining. Results. MTT assay showed that cell survival rate of HO-8910 cells in the photodynamic treatment group has significantly decreased down to % ( ). Light irradiation alone or hypocrellin B alone showed no significant impact. In our TEM mitochondria of the cells after photodynamic treatment of hypocrellin B showed severe damage with swollen mitochondria that had nearly nonexistant cristae. Mitochondrial membrane potential remarkably decreased after photodynamic action of hypocrellin B. Conclusion. The findings demonstrated that photodynamic action of hypocrellin B significantly decreased cell proliferation of ovarian cancer HO-8910 cells, caused severe damage to mitochondrial structure, and induced mitochondrial membrane collapse. 1. Introduction Ovarian cancer is one of the most common cancers threatening the health of women worldwide. Significant advances have been made in therapeutic modalities in the management of ovarian cancer. However, drawbacks exist in some of the commonly used modalities [1, 2]. Therefore, novel and more effective therapeutic strategies are needed for improving the clinical outcomes. Photodynamic therapy (PDT) can eradicate the unwanted cells/tissues via the generation of reactive oxygen species (ROS) during photodynamic treatment, in which a photosensitizer is activated by light with an appropriate wavelength [3, 4]. The doubly selective advantages, including photosensitizer selectively retaining in tumor tissue and site-directed light irradiation, make PDT become a promising alternative to combat malignancies. Photosensitizer is a key component affecting the efficacy of photodynamic therapy. Hypocrellin B is a natural product isolated from a traditional Chinese Medicine Hypocrella bambuase [5, 6]. Growing evidence shows that hypocrellin B has significantly photodynamic activity with high quantum yields of singlet oxygen (1O2) [7, 8]. Upon light
Analysis and Design of a ΔΣ Modulator for Fractional-N Frequency Synthesis
Zhang Weichao,Xu Jun,Zheng Zengyu,Ren Junyan
半导体学报 , 2006,
Abstract: 提出了一种适用于分数分频锁相环频率综合器的全数字噪声整型 ΔΣ调制器电路结构新的设计方法,并将其最终实现. 采用了流水线技术和新的CST算法优化多位输入加法器结构,从而降低了整体的复杂度和功耗. 这种电路结构通过了Matlab的行为级仿真,ASIC全定制实现并流片,该结构也通过VHDL综合实现验证,最后给出的测试结果表明该电路具有良好的性能,可应用于单片千兆赫兹级低功耗CMOS频率综合器中.
Mercury removal from coal combustion flue gas by modified fly ash
Wenqing Xu,Hairui Wang,Tingyu Zhu,Junyan Kuang,Pengfei Jing,
Wenqing Xu
,Hairui Wang,Tingyu Zhu,Junyan Kuang,Pengfei Jing

环境科学学报(英文版) , 2013,
Abstract: Fly ash is a potential alternative to activated carbon for mercury adsorption. The effects of physicochemical properties on the mercury adsorption performance of three fly ash samples were investigated. X-ray fluorescence spectroscopy, X-ray photoelectron spectroscopy, and other methods were used to characterize the samples. Results indicate that mercury adsorption on fly ash is primarily physisorption and chemisorption. High specific surface areas and small pore diameters are beneficial to efficient mercury removal. Incompletely burned carbon is also an important factor for the improvement of mercury removal efficiency, in particular. The C-M bond, which is formed by the reaction of C and Ti, Si and other elements, may improve mercury oxidation. The samples modified with CuBr2, CuCl2 and FeCl3 showed excellent performance for Hg removal, because the chlorine in metal chlorides acts as an oxidant that promotes the conversion of elemental mercury (Hg0) into its oxidized form (Hg2+). Cu2+ and Fe3+ can also promote Hg0 oxidation as catalysts. HCl and O2 promote the adsorption of Hg by modified fly ash, whereas SO2 inhibits the Hg adsorption because of competitive adsorption for active sites. Fly ash samples modified with CuBr2, CuCl2 and FeCl3 are therefore promising materials for controlling mercury emissions.
Deformation of K?hler manifolds
Junyan Cao
Mathematics , 2012,
Abstract: It has been shown by Claire Voisin in 2003 that one cannot always deform a compact K\"ahler manifold into a projective algebraic manifold, thereby answering negatively a question raised by Kodaira. In this article, we prove that under an additional semipositivity or seminegativity condition on the canonical bundle, the answer becomes positive, namely such a compact K\"ahler manifold can be approximated by deformations of projective manifolds.
Numerical dimension and a Kawamata-Viehweg-Nadel type vanishing theorem on compact K?hler manifolds
Junyan Cao
Mathematics , 2012, DOI: 10.1112/S0010437X14007398
Abstract: Let $X$ be a compact K\"ahler manifold and let $(L, \varphi)$ be a pseudo-effective line bundle on $X$. We first define a notion of numerical dimension of pseudo-effective line bundles with singular metrics, and then discuss the properties of this type numerical dimension. We finally prove a very general Kawamata-Viehweg-Nadel type vanishing theorem on an arbitrary compact K\"ahler manifold.
Ohsawa-Takegoshi extension theorem for compact K?hler manifolds and applications
Junyan Cao
Mathematics , 2014,
Abstract: Our main goal in this article is to prove a new extension theorem for sections of the canonical bundle of a weakly pseudoconvex K\"ahler manifold with values in a line bundle endowed with a possibly singular metric. We also give some applications of our result.
Kodaira dimension of algebraic fiber spaces over surfaces
Junyan Cao
Mathematics , 2015,
Abstract: In this short note we prove the Iitaka C_nm conjecture for algebraic fiber spaces over surfaces
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