oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 103 )

2018 ( 797 )

2017 ( 772 )

2016 ( 705 )

Custom range...

Search Results: 1 - 10 of 45965 matches for " ZHAO Chao "
All listed articles are free for downloading (OA Articles)
Page 1 /45965
Display every page Item
Photocatalytic Treatment of Microcystin-LR-Containing Wastewater Using Pt/WO 3 Nanoparticles under Simulated Solar Light  [PDF]
Chao Zhao, Yingnan Yang, Zhenya Zhang
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.22011
Abstract: This study investigates the photocatalytic degradation of microcystin-LR (MC-LR) under simulated solar light using Pt modified nano-sized tungsten trioxides (Pt/WO3). Photocatalytic activity was higher during the degradation of MC-LR with Pt/WO 3 than with pure WO 3 or Ti O2 . The catalyst loading greatly affect the degradation performance. The rate of degradation is influenced by the initial pH of the reaction solution. This study also investigates the photocatalytic inactivation of cyanobacteria. The results show that the algal growth was successfully controlled by the Pt/W O 3 . This study suggests Pt/W O 3 photocatalytic oxidation with solar light is a promising treatment for water containing MC-LR.
Political Connection, Management Promotion and Risk Taking Activities  [PDF]
Qiaoyi Zhao, Suowen Wang, Chao Chen
Modern Economy (ME) , 2014, DOI: 10.4236/me.2014.57071
Abstract:

This paper investigates how political connection and management promotion affect chances of risk-taking activities, in order to offer theoretical support for state-owned enterprises to select optimal managers, and to maintain and increase their company values. Using the data of chairman of state-owned listed enterprises in Shenzhen securities market, we find that in state-owned listed enterprises, the shorter the pyramid of listed enterprises to ultimate shareholders is, the closer the political connection is, the more likely the chairman is to take up risk-taking activities for promotion. While for the same pyramid, the longer the tenure of chairman, the more chances of risk-taking activities.

Measuring the Intraday Jump Tail Risk of Financial Asset Price with Noisy High Frequency Data  [PDF]
Chao Yu, Xujie Zhao, Feng Zhang
Open Journal of Statistics (OJS) , 2017, DOI: 10.4236/ojs.2017.71006
Abstract: This paper proposes a simple two-step nonparametric procedure to estimate the intraday jump tail and measure the jump tail risk in asset price with noisy high frequency data. We first propose the pre-averaging threshold approach to estimate the intraday jumps occurred, and then use the peaks-over-threshold (POT) method and generalized Pareto distribution (GPD) to model the intraday jump tail and further measure the jump tail risk. Finally, an empirical example further demonstrates the power of the proposed method to measure the jump tail risk under the effect of microstructure noise.
Hard X-ray free-electron laser based on echo-enabled staged harmonic generation scheme
Chao Feng,ZhenTang Zhao
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-0002-0
Abstract: A novel approach to producing coherent hard X-ray based on the echo-enabled staged harmonic generation (EESHG) free-electron laser scheme is proposed. This scheme is not a simple cascaded echo-enabled harmonic generation (EEHG) but consists of an EEHG and a conventional high-gain harmonic generation (HGHG) like configuration, which also works in the EEHG principle. It is shown that fully coherent hard X-ray radiation can be obtained directly from a conventional VUV seed laser with reduced size and cost in comparison with the self-amplified spontaneous emission (SASE) based hard X-ray facilities.
Approach of Camera Relative Pose Estimation Based on Epipolar Geometry
Chao Li,Yue Zhao
Information Technology Journal , 2012,
Abstract: Estimation of camera relative positions is very important in computer vision. Assuming that the camera has been calibrated, this study presents two algorithms of camera relative pose estimation which one is to recover the camera motion parameters by essential matrix and the other by epipolar geometry. Algorithm 1 is commonly used in three-dimensional (3D) reconstruction. In algorithm 2, firstly linearize coplanar condition equation through Taylor's expansion and solve elements of relative orientation by iteration procedure, finally recover camera motion parameters. Compared with the above two algorithms, algorithm 1 requires at least eight pairs of matching points and consider degenerate condition, algorithm 2 simply requires five pairs of matching points. Experimental data reveals that the two algorithms are feasible and the results of them are close which have the higher robustness and can satisfy the requirement of 3D reconstruction.
The Study on the Hierarchy of Internet Router-Level Topology  [PDF]
Jun ZHANG, Hai ZHAO, Chao LI, Xin GE
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.24032
Abstract: Being a huge system, Internet topology structure is very complex. It can’t be treated as a plane simply, and its hierarchy must be analyzed. We used the k-core decomposition to disentangle the hierarchical structure of Internet Router-level topology. By analyzing the router-lever Internet topology measuring data from CAIDA (The Cooperative Association for Internet Data Analysis) ,we studied the characteristics of the nodes in the inner hierarchy and outer hierarchy respectively. The frequency-degree power law of the nodes which core-ness is lower and the regionally distribution of the nodes which coreness is higher were concluded. At last, the topology of every hierarchy was described by giving their figures. These descriptions can provide a valuable reference for modeling on the Internet topology.
Synthesis and Antitumor Activity of the Thiazoline and Thiazine Multithioether  [PDF]
Wei Wang, Bing Zhao, Chao Xu, Wenpeng Wu
International Journal of Organic Chemistry (IJOC) , 2012, DOI: 10.4236/ijoc.2012.22018
Abstract: A series of novel multithioether derivatives were synthesized by the combination of thiazoline and thiazine with dibro- mides and their structures were characterized by IR, 1H NMR, MS and elemental analysis. The synthesized derivatives were tested for antitumor activity.
Brief Report Parameter estimation for Muskingum routing model based on robust algorithm
基于抗差算法的马斯京根参数估计

ZHAO Chao,
赵超

中国科学院研究生院学报 , 2010,
Abstract: There are a variety of techniques for estimating the parameters of the Muskingum routing model. However the robustness of these methods has to be questioned because of the tendency of outliers in data to strongly influence the outcome. A robust estimation has been presented. The robustness of this estimator has been compared with the least squares method by means of synthetic data sets, in which both Gaussian random errors and outliers have been introduced. The study demonstrates that the robust estimator has the potential to reduce estimation bias in the presence of outliers, and it has an advantage over the least squares method.
Hard X-ray free-electron laser based on echo-enabled staged harmonic generation scheme

Chao Feng,ZhenTang Zhao,

科学通报(英文版) , 2010,
Abstract: A novel approach to producing coherent hard X-ray based on the echo-enabled staged harmonic generation (EESHG) free-electron laser scheme is proposed. This scheme is not a simple cascaded echo-enabled harmonic generation (EEHG) but consists of an EEHG and a conventional high-gain harmonic generation (HGHG) like configuration, which also works in the EEHG principle. It is shown that fully coherent hard X-ray radiation can be obtained directly from a conventional VUV seed laser with reduced size and cost in c...
One-Stage Repair and Reconstruction of Craniomaxillofacial Bone Defects  [PDF]
Jianhua Wang, Chao Hu, Gang Zhang, Songbo Qiu, Jun Cai, Xiaobo Wu, Zhao Xiang, Yinghui Tan
Modern Plastic Surgery (MPS) , 2013, DOI: 10.4236/mps.2013.31002
Abstract:

Objective: Severe craniomaxillofacial injuries and craniomaxillofacial tumors can lead to craniomaxillofacial bone defects and deformities. Seriously affect the patients’ appearance and quality of life. So one-stage repair and reconstruction of craniomaxillofacial bone defects is of great significance. The current study summarizes the clinical experience of one-stage repair and reconstruction of craniomaxillofacial bone defects. Material and Methods: Data in one-stage repair and reconstruction of craniomaxillofacial bone defects performed on 13 patients were retrospectively analyzed out of 34 patients with craniomaxillofacial injuries or tumors who received treatment at the outpatient department between January 2002 and March 2011. Surgical indications and approaches were explored after two typical cases were detected. Results: One-stage repair and reconstruction of bone defects was suitable for patients with craniomaxillofacial injuries and excised craniomaxillofacial benign tumors. Adjacent autogenous bones and artificial materials (such as titanium plates, titanium mesh, and so on) work well for the repair of the craniomaxillofacial bone frame and restoration of facial features. Conclusions: Surgical indications should be strictly selected in one-stage repair and reconstruction of craniomaxillofacial bone defects and deformities. Furthermore, the adoption of autogenous bones and artificial materials is a good choice in restoring the craniofacial features.

Page 1 /45965
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.