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Search Results: 1 - 10 of 23396 matches for " SHI Jiehua "
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Simultaneous determination of phenobarbital,estazolam and clonazepam in human plasma by micellar liquid chromatography
胶束液相色谱法同时测定血浆中的苯巴比妥、艾司唑仑和氯硝西泮

SHI Jiehua,PENG Li,
施介华
,彭丽

色谱 , 2010,
Abstract: An analytical method based on micellar liquid chromatography has been developed for simultaneous determination of phenobarbital, estazolam and clonazepam in human plasma. The effects of the concentrations of surfactant, cosurfactant and hydrogen ion in mobile phase (hereafter abbreviated respectively as CM, Cφ and CH) on the retention behavior of the 3 compounds were investigated in terms of three-phase equilibrium theory. The quantitative relationships between the logarithm of retention factor (log k) and the parameters of solutes properties and the composition of mobile phase were set with multiple linear regression method. The experimental results showed that the retention factors (k) of solutes were decreased with the increase of the concentration of surfactant, cosurfactant and hydrogen ion in the mobile phase. The effects of changes of CM, CH and Cφ on retention factors were fully consistent with the theoretical modeling. And there is better multielement linear relationship between the log k of solutes and the logarithm of hydrophobic parameter (log P) and ionization constant (Ka) of solutes and CM, CH and Cφ in the mobile phase. The separation efficiency between phenobarbital, estazolam, clonazepam and other components in human plasma was better under the selected chromatographic conditions. The linearities were good in the ranges of 2.5~50 mg/L of phenobarbital, 0.25~5.0 mg/L of estazolam and 0.05~5.0 mg/L of clonazepam. The method is simple, accurate and reproducible for the determination of phenobarbital, estazolam and clonazepam. The limits of detection (LODs) for phenobarbital, estazolam and clonazepam were found to be 10.27, 1.17 and 0.867 ng (S/N=3), respectively. The recoveries of the method for the determination of phenobarbital, estazolam and clonazepam were 99.80%~102.9%, 94.00%~98.20% and 96.30%~98.70%, respectively.
The Convergence of Two Algorithms for Compressed Sensing Based Tomography  [PDF]
Xiezhang Li, Jiehua Zhu
Advances in Computed Tomography (ACT) , 2012, DOI: 10.4236/act.2012.13007
Abstract: The constrained total variation minimization has been developed successfully for image reconstruction in computed tomography. In this paper, the block component averaging and diagonally-relaxed orthogonal projection methods are proposed to incorporate with the total variation minimization in the compressed sensing framework. The convergence of the algorithms under a certain condition is derived. Examples are given to illustrate their convergence behavior and noise performance.
A Reweighted Total Variation Algorithm with the Alternating Direction Method for Computed Tomography  [PDF]
Xiezhang Li, Jiehua Zhu
Advances in Computed Tomography (ACT) , 2019, DOI: 10.4236/act.2019.81001
Abstract: A variety of alternating direction methods have been proposed for solving a class of optimization problems. The applications in computed tomography (CT) perform well in image reconstruction. The reweighted schemes were applied in l1-norm and total variation minimization for signal and image recovery to improve the convergence of algorithms. In this paper, we present a reweighted total variation algorithm using the alternating direction method (ADM) for image reconstruction in CT. The numerical experiments for ADM demonstrate that adding reweighted strategy reduces the computation time effectively and improves the quality of reconstructed images as well.
Numerical Studies of the Generalized l1Greedy Algorithm for Sparse Signals  [PDF]
Fangjun Arroyo, Edward Arroyo, Xiezhang Li, Jiehua Zhu, Jiehua Zhu
Advances in Computed Tomography (ACT) , 2013, DOI: 10.4236/act.2013.24023
Abstract:

The generalized l1 greedy algorithm was recently introduced and used to reconstruct medical images in computerized tomography in the compressed sensing framework via total variation minimization. Experimental results showed that this algorithm is superior to the reweighted l1-minimization and l1 greedy algorithms in reconstructing these medical images. In this paper the effectiveness of the generalized l1 greedy algorithm in finding random sparse signals from underdetermined linear systems is investigated. A series of numerical experiments demonstrate that the generalized l1 greedy algorithm is superior to the reweighted l1-minimization and l1 greedy algorithms in the successful recovery of randomly generated Gaussian sparse signals from data generated by Gaussian random matrices. In particular, the generalized l1 greedy algorithm performs extraordinarily well in recovering random sparse signals with nonzero small entries. The stability of the generalized l1 greedy algorithm with respect to its parameters and the impact of noise on the recovery of Gaussian sparse signals are also studied.

Continuous maps with the whole space being a scrambled set
Jiehua Mai
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882567
Abstract:
Smale horseshoe maps by 5-adic fractions
Jiehua Mai
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882485
Abstract:
Analysis on the Effect of Sub-Module Practices from a Perspective of “a Plan for Educating and Training Outstanding Engineers” —In Case of Computer Science Students in Nantong University  [PDF]
Huizhong Xu, Jiehua Wang, Yajun Yin
Creative Education (CE) , 2015, DOI: 10.4236/ce.2015.618208
Abstract: In the background of the Ministry of Education to start “a Plan for Educating and Training Out-standing Engineers” (PETOE), Nantong University has implemented the “3 + 1” training mode re-form in computer science students; one of the most critical and core is the sub-module practice in the fourth year. The survey about 2015 graduates, teachers and companies who involved in the reform indicates that students’ training quality and employability are positively correlated with the sub-module practice which can enhance students’ professional competence and professionalism. At the same time, we should form practice guidance and management specifications, push teachers to adapt to the reform and strengthen the cultivation of students’ autonomous learning and thinking actively.
Conditions for origin to be a center and the bifurcation of limit cycles in a class of cubic systems
Jiehua Zhu,Siming Zhu
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882836
Abstract:
Necessary and sufficient condition of C0 flows on closed surfaces with isolated singular points having the pseudoorbit tracing property
Jiehua Mai,Rongbao Gu
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882452
Abstract:
Smale horseshoe maps by 5-adic fractions

Jiehua Mai,

科学通报(英文版) , 1997,
Abstract:
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