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Search Results: 1 - 10 of 80933 matches for " Lidong Liu "
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Electromagnetic and Microwave Absorption Properties of Carbonyl-Iron/Fe91Si9 Composites in Gigahertz Range  [PDF]
Jingbo Guo, Yuping Duan, Lidong Liu, Liyang Chen, Shunhua Liu
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.35023
Abstract: Carbonyl-iron/Fe91Si9 composites for thin microwave absorbers were firstly prepared by a simple blending technique. The patterns of carbonyl-iron and Fe91Si9 were characterized by scanning electron microscope (SEM). The complex permittivity, permeability and microwave absorption properties of the composites were studied in the frequency range of 2 - 7GHz by a HP8720B vector network analyzer. Complex permittivity and permeability decrease gradually with increasing weight percentage of Fe91Si9 in the composites, the variation of permittivity was very large but the variation of permeability was very small. The composites exhibited excellent microwave absorption properties with increasing Fe91Si9 content. The reflection loss (RL) values less than –20 dB were obtained in the 3.7 - 6.7 GHz frequency range for the paraffin matrix composites with 80 wt% carbonyl-iron/Fe91Si9 powders (weight ratio of carbonyl-iron to Fe91Si9 was 1:1), with thickness of 4.0 - 2.4 mm, respectively. The optimal RL of –45 dB was observed at 5.2 GHz with a matching thickness (dm) of 3.0 mm. The excellent microwave absorption properties were attributed to a better electromagnetic impedance match and a higher electric resistivity.
Chaos for Discrete Dynamical System
Lidong Wang,Heng Liu,Yuelin Gao
Journal of Applied Mathematics , 2013, DOI: 10.1155/2013/212036
Abstract:
Li-Yorke Sensitivity of Set-Valued Discrete Systems
Heng Liu,Fengchun Lei,Lidong Wang
Journal of Applied Mathematics , 2013, DOI: 10.1155/2013/260856
Abstract: Consider the surjective, continuous map and the continuous map of induced by , where is a compact metric space and is the space of all nonempty compact subsets of endowed with the Hausdorff metric. In this paper, we give a short proof that if is Li-Yoke sensitive, then is Li-Yorke sensitive. Furthermore, we give an example showing that Li-Yorke sensitivity of does not imply Li-Yorke sensitivity of . 1. Introduction Throughout this paper a dynamical system is a pair where is a compact metric space with metric and is a surjective, continuous map. The idea of sensitivity from the work [1, 2] by Ruelle and Takens was applied to topological dynamics by Auslander and Yorke in [3] and popularized later by Devaney in [4]. A system is called -sensitive if there exists a positive such that any is a limit of points satisfying the condition for some positive integer . According to Li and Yorke (see [5]), a subset is a scrambled set (for ), if any different points and from are proximal and not asymptotic; that is, Li-Yoke sensitivity is introduced by Akin and Kolyada in [6]. A system is Li-Yorke sensitive if there exists such that every is a limit of points such that the pair is proximal but for any , and the positive is said to be a Li-Yorke sensitive constant of the system. A pair is -Li-Yorke sensitive if the pair is proximal but whose orbits are frequently at least apart. A dynamical system is called spatiotemporal chaotic (see [6] or [7]) if every point is a limit point for points which are proximal to but not asymptotic to it. That is, for any and any open subset with , there is such that and are proximal and not asymptotic. It is easy to see that Li-Yorke sensitivity implies spatiotemporal chaos and sensitivity. Román-Flores [8] and Fedeli [9] studied the interplay of chaos for discrete dynamical systems (individual chaos) with the corresponding set-valued versions (collective chaos). Recall that the map induced by on is defined by , . Then the pair is a dynamical system with the space endowed with the Hausdorff distance: and . And various concepts of chaos in set-valued discrete systems have been researched recently (see [10–16]). In this paper, we discuss the relationship between Li-Yorke sensitivity of and Li-Yorke sensitivity of . It will be shown that if is Li-Yoke sensitive, then is Li-Yorke sensitive. Furthermore, we give an example showing that Li-Yorke sensitivity of does not imply Li-Yorke sensitivity of . This paper discusses the further work of [17]. And by suing the obtained results, we give positive answers to Sharma and Nagar’s question in
Anti-Cancer Effects and Mechanisms of Capsaicin in Chili Peppers  [PDF]
Siwei Cao, Huoji Chen, Shijian Xiang, Junhui Hong, Lidong Weng, Hongxia Zhu, Qiang Liu
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.619300
Abstract: Cancer is a major cause of morbidity and mortality all over the world and a promising area of cancer research is concentrated on chemoprevention by nutritional compounds. Capsaicin, traditionally used as a food additive and an analgesic, is one of the main pungent ingredients in chili peppers. Recent studies have shown that capsaicin has anti-cancer effects in various types of cancer model. The purpose of this review is to outline the anticarcinogenic effect of capsaicin and its mechanism.
A broadband microwave Corbino spectrometer at $^3$He temperatures and high magnetic fields
Wei Liu,LiDong Pan,N. P. Armitage
Physics , 2014, DOI: 10.1063/1.4895798
Abstract: We present the technical details of a broadband microwave spectrometer for measuring the complex conductance of thin films covering the range from 50 MHz up to 16 GHz in the temperature range 300 mK to 6 K and at applied magnetic fields up to 8 Tesla. We measure the complex reflection from a sample terminating a coaxial transmission line and calibrate the signals with three standards with known reflection coefficients. Thermal isolation of the heat load from the inner conductor is accomplished by including a section of NbTi superconducting cable (transition temperature around 8 $-$ 9 K) and hermetic seal glass bead adapters. This enables us to stabilize the base temperature of the sample stage at 300 mK. However, the inclusion of this superconducting cable complicates the calibration procedure. We document the effects of the superconducting cable on our calibration procedure and the effects of applied magnetic fields and how we control the temperature with great repeatability for each measurement. We have successfully extracted reliable data in this frequency, temperature and field range for thin superconducting films and highly resistive graphene samples.
Synthesis and Anti-Tumor Activities of Fluoride-Containing Gossypol Derivatives Compounds  [PDF]
Liying Zeng, Yijian Deng, Lidong Weng, Zhijun Yang, Huoji Chen, Qiang Liu
Natural Science (NS) , 2017, DOI: 10.4236/ns.2017.99030
Abstract:
We report herein the design and synthesis of a series of novel fluoride-containing gossypol derivatives by the condensation reaction of gossypol with fluoride-containing aromatic amine. These fluoride-containing gossypol derivatives were characterized by IR, 1H-NMR and high resolution mass spectral data, then screened as antitumor agents against three human cancer cell lines (HeLa, A-549 and BGC-823) and a normal cell line (VEC) in vitro by using MTT cell proliferation assays. Results revealed that compounds 3a, 3c and 3f exhibited superior anticancer activity against HeLa, compounds 3b,3c, 3e and 3f exhibited superior anticancer activity against A-549, compounds 3b, 3c and 3f exhibited superior anticancer activity against BGC-823 compared to gossypol. In particular, fluorine substituent at the para positions of the phenyl ring showed remarkable inhibitory effects on HeLa?(3c: IC50 = 14.2 μM, 3f:?IC50 = 8.34 μM), A-549(3c: IC50 = 6.32 μM, 3f: IC50 = 9.76 μM) and BGC-823 cells?(3c: IC50 = 8.62 μM, 3f: IC50 = 4.36 μM). Furthermore, all the compounds 3a-3f exhibited lessened cytotoxicity against VEC compared to gossypol.
Biodiversity of the Symbiotic Bacteria Associated with Toxic Marine Dinoflagellate Alexandrium tamarense  [PDF]
Xiaoling Zhang, Xiaoqing Tian, Liyan Ma, Bing Feng, Qiaohong Liu, Lidong Yuan, Chengqi Fan, Hongliang Huang, Hongliang Huang, Qiao Yang
Journal of Biosciences and Medicines (JBM) , 2015, DOI: 10.4236/jbm.2015.36004
Abstract:

Paralytic shellfish poisoning (PSP) toxins are potent neurotoxins mainly produced by dinoflagellates and being concentrated in bivalves through food web transfer. Increasing number of findings of toxin-producing bacteria in the cells of dinoflagellate such as Alexandriumtamarense supports the hypothesis of the bacterial origin of PSP toxins. Evidence that there are specific symbiosis bacterial taxa associated with the phytoplankton indicates the presence of specific selective mechanisms between them, and implies that the symbiosis bacteria have some vital function to the benefit of the dinoflagellates. Studies on the role of toxin-producing symbiosis bacteria in the marine ecosystem are considered to be becoming more important. Although toxigenic bacteria could be isolated from toxic dinoflagellates, it was not clearly proven whether the isolated bacterial strains based on culture-dependent manner and the corresponding intracellular bacteria were the same because of microbial unculturability. This paper aims to demonstrate the biodiversity of the symbiotic bacteria associated with toxic dinoflagellate A. tamarense using the culture-indepen- dent high-throughput pyrosequencing method, as well as the phylogenetic analysis based on 16S rDNA sequences of the symbiotic cultivable bacteria strains isolated from toxic Alexander tamarense.

On the Reflected Geometric Brownian Motion with Two Barriers  [PDF]
Lidong Zhang, Ziping Du
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.23034
Abstract: In this paper, we are concerned with Re?ected Geometric Brownian Motion (RGBM) with two barriers. And the stationary distribution of RGBM is derived by Markovian in?nitesimal Generator method. Consequently the ?rst passage time of RGBM is also discussed.
Tourist Marketing: A New Approach to Tourist Destination Marketing
游客营销——旅游地营销的新途径

Liu Nan,Wang Lidong,
刘南
,汪立东

浙江大学学报(人文社会科学版) , 2008,
Abstract: Tourists as a kind of scarce resource with a significant potential value that have often been ignored in the study of marketing.They disseminate their tourist experience and information on tourist destinations,thereby producing a significant influence on potential tourists' selection of travel and tourist destinations.Promoting tourists to spread tourist information consciously or unconsciously to people around them,tourist marketing reliably and effectively realizes tourist destination marketing with low costs.Tourist marketing,different from traditional tourist destination marketing,has its unique features.It involves many aspects of tourist destinations and it is the reconstruction of various marketing means under a new guiding ideology.Tourist marketing focuses on promoting tourists to spread positive rather than negative tourist information,providing suitable contents for tourists to spread and choosing opinion leaders among tourists for focal marketing.The paradoxical issues of tourists in spreading tourist information,the ethic issues in conducting tourist marketing and the evaluation of marketing performance are also addressed in tourist marketing.
Chaotic signal reconstruction with application to noise radar system
Liu Lidong,Hu Jinfeng,He Zishu,Han Chunlin
EURASIP Journal on Advances in Signal Processing , 2011,
Abstract: Chaotic signals are potentially attractive in engineering applications, most of which require an accurate estimation of the actual chaotic signal from a noisy background. In this article, we present an improved symbolic dynamics-based method (ISDM) for accurate estimating the initial condition of chaotic signal corrupted by noise. Then, a new method, called piecewise estimation method (PEM), for chaotic signal reconstruction based on ISDM is proposed. The reconstruction performance using PEM is much better than that using the existing initial condition estimation methods. Next, PEM is applied in a noncoherent reception noise radar scheme and an improved noncoherent reception scheme is given. The simulation results show that the improved noncoherent scheme has better correlation performance and range resolution especially at low signal-to-noise ratios (SNRs).
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