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Search Results: 1 - 10 of 4902 matches for " ZOU Jixin "
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Analysis of major components in water based stamp pad inks and their imprints by ultra high performance liquid chromatography-mass spectrometry and gas chromatography-mass spectrometry

ZHANG Qing,ZOU Jixin,SHI Gaojun,ZHANG Lijuan,

色谱 , 2010,
Abstract: Ultra high performance liquid chromatography-mass spectrometry (UHPLC-MS) technology and gas chromatography-mass spectrometry (GC-MS) technology were used to qualitatively analyze the major components in water based stamp pad inks including major colorants and volatile components. After the samples were supersonically extracted and then centrifuged, UHPLC-MS was used to separate and identify the major colorants. A ZORBAX Eclipse Plus Phenyl-Hexyl (50 mm×4.6 mm, 1.8 μm) column and 15 mmol/L ammonium acetate-acetonitrile were utilized for the separation and negative selected ion monitoring mode (SIM) was set for the MS analysis. An HP-INNOWAX (30 m×0.25 mm, 0.25 μm) column was employed in the GC-MS analysis with the full-scan mode to determine the volatiles. This study demonstrated that the major colorants in the inks and their imprints were Acid Red R, Eosin Y and Pigment Red 112| and the major volatiles were glycerol, 1,2-propanediol, etc. The method is rapid and accurate. It also demonstrates that the method can meet the requirements for imprint determination in material evidence identification. The work provides a reliable tool for the categorization research in the forensic sciences.
Realization of a Covert Communication System Over the Public Switching Telephone Network
Jixin Liu,Zheming Lu
Information Technology Journal , 2009,
Abstract: In this study, a covert communication applying the vector quantization based information hiding algorithm and the Public Switching Telephone Network (PSTN) is implemented. The system aims at offering good security of the secret binary image message and the real-time performance that is very important for the speech calling of the telephone service. Therefore, we adopt a simple and effective encryption method for the secret binary image message prior to the embedding process. The embedding position is also protected by using a secret key. By using these methods, the requirement of short-term protection in the bursting phone call communication for the secret binary image message and the real-time encryption are both fulfilled. Furthermore, an information hiding algorithm based on vector quantization is proposed and the advantage of it is discussed. We evaluate the system with the ITU-T G.729a standard speech codec in StegoPhone, which is our platform for research on covert communication technology via PSTN. The experimental results show that our method has negligible hearing effects on the conversation speech and meet the requirement of the real-time calling conversation communication via PSTN.
Multivariate saddlepoint approximations in tail probability and conditional inference
John Kolassa,Jixin Li
Statistics , 2010, DOI: 10.3150/09-BEJ237
Abstract: We extend known saddlepoint tail probability approximations to multivariate cases, including multivariate conditional cases. Our approximation applies to both continuous and lattice variables, and requires the existence of a cumulant generating function. The method is applied to some examples, including a real data set from a case-control study of endometrial cancer. The method contains less terms and is easier to implement than existing methods, while showing an accuracy comparable to those methods.
Cost Control of the Transmission Congestion Management in Electricity Systems Based on Ant Colony Algorithm  [PDF]
Bin Liu, Jixin Kang, Nan Jiang, Yuanwei Jing
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.31003
Abstract: This paper investigates the cost control problem of congestion management model in the real-time power systems. An improved optimal congestion cost model is built by introducing the congestion factor in dealing with the cases: opening the generator side and load side simultaneously. The problem of real-time congestion management is transformed to a nonlinear programming problem. While the transmission congestion is maximum, the adjustment cost is minimum based on the ant colony algorithm, and the global optimal solu-tion is obtained. Simulation results show that the improved optimal model can obviously reduce the adjust-ment cost and the designed algorithm is safe and easy to implement.
Analysis of Influence Factors of Tide-Dominated Estuaries Based on Deposition Numerical Simulation  [PDF]
Tao Tang, Jixin Huang, Yanshu Yin, Wenjie Feng
Open Journal of Yangtze Oil and Gas (OJOGas) , 2018, DOI: 10.4236/ojogas.2018.32012
Abstract: Tide-dominated estuaries sedimentary reservoir is a hot area of sedimentology research in recent years, and the important target of oil and gas exploration is one of the relatively few sedimentary systems. Based on the study of underground reservoirs, outcrop and modern sedimentation, scholars believe that the estuary is a sedimentary system formed by transgressive system tract, which is composed of a complex subfacies environment with obvious changes. Its formation is influenced by many factors. The purpose of this paper is to simulate the deposition process of estuaries by Delft-3D software, and to reveal the main controlling factors of estuarine reservoir formation. The factors are as follows. 1) The size of the river flow has a destructive effect on the formation of the estuarine sand bar in the estuary, but the effect is small. 2) Tidal energy plays a constructive role in estuarine sand bars in estuaries, and it is also the main force for the formation of estuarine reservoirs. 3) The composition of the sediments has an obvious influence on the formation of the estuarine reservoir, and the content of the mud is an important factor for the retention of the estuarine sand bar.
The Power of Assumptions  [PDF]
Yongchen Zou
Modern Economy (ME) , 2011, DOI: 10.4236/me.2011.24056
Abstract: This paper examines computational merits provided by assumptions made in scientific modeling, especially regression, by trying to exhibit abstractly a model deprived of those assumptions. It shows that the principle of Occam’s Razor has been mistakenly used as model developers’ justification to keep scientific models “as simple as possible”, and that the cost of inflating computability is truncation of model robustness.
A Novel Non-Equidistant Grey GRM(1,1) Model Based on Reciprocal Accumulated Generating  [PDF]
Ruibiao Zou
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.38135
Abstract: Applying the reciprocal accumulated generating and the reconstruction method of GRM(1,1) model’s background value of non-equidistant sequence based on the exponential trait of grey model and the definition of integral for the problem of lower precision as well as lower adaptability in non-equidistant GM(1,1) model, the calculation formulas were deduced and a novel non-equidistant GRM(1,1) model generated by reciprocal accumulated generating was put forward. The grey GRM(1,1) model can be used in non-equidistant interval & equidistant interval time series and has the characteristic of high precision as well as high adaptability. Example validates the practicability and reliability of the proposed model.
Steady-State Behavior of Semiconductor Laser Diodes Subject to Arbitrary Levels of External Optical Feedback  [PDF]
Qin Zou
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.31021

This paper investigates the steady-state behavior of a semiconductor laser subject to arbitrary levels of external optical feedback by means of an iterative travelling-wave (ITW) model. Analytical expressions are developed based on an iterative equation. We show that, as in good agreement with previous work, in the weak-feedback regime of operation except for a phase shift the ITW model will be simplified to the Lang-Kobayashi (LK) model, and that in the case where this phase shift is equal to zero the ITW model is identical to the LK model. The present work is of use in particular for distinguishing the coherence-collapse regime from the strong-feedback regime where low-intensity-noise and narrow-linewidth laser operation would be possible at high feedback levels with re-stabilization of the compound laser system.

A New Scheme for Discrete HJB Equations  [PDF]
Zhanyong Zou
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.517252
Abstract: In this paper we propose a relaxation scheme for solving discrete HJB equations based on scheme II [1] of Lions and Mercier. The convergence of the new scheme has been established. Numerical example shows that the scheme is efficient.
Capital Market and Enterprise Core Competitiveness Interaction Mechanism—Based on the Case of Kangmei Pharmaceutical Co., Ltd  [PDF]
Bo Zou
Modern Economy (ME) , 2015, DOI: 10.4236/me.2015.64044
Abstract: Since the establishment of China’s capital market, it has been imperfect. Many listed companies misappropriating the capital market, and some of them want to expand the size through the capital market. It seems that enhance corporate value is impossible, too. However, companies want bigger and stronger cannot do without a strong leverage of the capital market, and enterprises to enhance their value can be counterproductive in the capital markets, improve the efficiency of capital markets. This paper analyzes Kangmei Pharmaceutical Co., Ltd, and the relationship between its financing and value growth in the Chinese capital market, research results exist mutually reinforcing mechanisms between capital market efficiency and core competitiveness of enterprises.
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