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Search Results: 1 - 10 of 36634 matches for " ZHENG Lei "
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The Utilization of Push Mail in China  [PDF]
Huisong ZHENG, Lei CAI
Journal of Service Science and Management (JSSM) , 2009, DOI: 10.4236/jssm.2009.23022
Abstract: Push mail is popular to business users in the world. It has been two years since push mail was introduced into China. In order to find out the status of its development and utilization, investigation to push mail users is made. The results indicate that the existing subscribers are mostly managers of service enterprises in large and middle-size, such as manu-facturing, trade, IT and so on. In addition, those subscribers are satisfied with push mail, and would like to continue to use it in the following years. On the other hand, as it is still very small on the population to both terminal users and enterprise subscribers, some suggestions are made to induce push mail’s development.
Competitiveness Promotion and Cost-management Innovation for China Automobile Industry
Lei Zheng
International Journal of Business and Management , 2009,
Abstract: The automobile industry is the dominant industry in China in the first ten years in 21th century. So the international competitiveness of China automobile industry occupies a special strategic position in the economy development. By an integrated analysis on the situation of our automobile industry, the best way to promote the industry competitiveness in a short time is to perform cost-management innovation which includes two aspects, namely the theory innovation and methods innovation.
The First Identified Nucleocytoplasmic Shuttling Herpesviral Capsid Protein: Herpes Simplex Virus Type 1 VP19C
Lei Zhao, Chunfu Zheng
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041825
Abstract: VP19C is a structural protein of herpes simplex virus type 1 viral particle, which is essential for assembly of the capsid. In this study, a nuclear export signal (NES) of VP19C is for the first time identified and mapped to amino acid residues 342 to 351. Furthermore, VP19C is demonstrated to shuttle between the nucleus and the cytoplasm through the NES in a chromosomal region maintenance 1 (CRM1)-dependent manner involving RanGTP hydrolysis. This makes VP19C the first herpesviral capsid protein with nucleocytoplasmic shuttling property and adds it to the list of HSV-1 nucleocytoplasmic shuttling proteins.
Effects of Concrete on Propagation Characteristics of Guided Wave in Steel Bar Embedded in Concrete
Zhupeng Zheng,Ying Lei
Shock and Vibration , 2014, DOI: 10.1155/2014/910750
Abstract: Techniques based on ultrasonic guided waves (UGWs) play important roles in the structural health monitoring (SHM) of large-scale civil infrastructures. In this paper, dispersion equations of longitudinal wave propagation in reinforced concrete member are investigated for the purpose of monitoring steels embedded in concrete. For a steel bar embedded in concrete, not the velocity but the attenuation dispersion curves will be affected by the concrete. The effects of steel-to-concrete shear modulus ratio, density ratio, and Poisson’s ratio on propagation characteristics of guided wave in steel bar embedded in concrete were studied by the analysis of the real and imaginary parts of the wave number. The attenuation characteristics of guided waves of steel bar in different conditions including different bar concrete constraint and different diameter of steel bar are also analyzed. Studies of the influence of concrete on propagation characteristics of guided wave in steel bars embedded in concrete will increase the accuracy in judging the structure integrity and promote the level of defect detection for the steel bars embedded in concrete. 1. Introduction In recent years, techniques based on ultrasonic guided waves (UGWs) have gained popularities and played important roles in the structural health monitoring (SHM) of large-scale civil infrastructures as guided waves have some important advantages, such as the capability of testing over long range with a greater sensitivity, the ability to test multilayered structures, and relatively cheapness due to simplicity and sensor cost [1]. Furthermore, frequency and mode tuning of UGWs can be utilized for evaluation of different types of deterioration or damage because UGWs have many different modes at a single frequency that are sensitive to different defects. Due to the above, various techniques based on guided wave have been proposed for damage detection and condition assessments of aerospace, mechanical, civil engineering structures, and other nondestructive test (NDT) areas. Raghavan and Cesnik [2] presented a review of guided wave for structural health monitoring. Sohn et al. [3] investigated delamination detection in composites through guided wave imaging. Song et al. [4, 5] developed smart piezoceramic transducers with guided wave for concrete structural health monitoring, Giurgiutiu [6] studied lamb wave generation with piezoelectric wafer active sensors for structural health monitoring (SHM). Wang et al. [7] investigated the effects of a defect’s geometric parameters on the two reflection signals in pipe
A Complete Global Solution to the Pressure Gradient Equation
Zhen Lei,Yuxi Zheng
Mathematics , 2009,
Abstract: We study the domain of existence of a solution to a Riemann problem for the pressure gradient equation in two space dimensions. The Riemann problem is the expansion of a quadrant of gas of constant state into the other three vacuum quadrants. The global existence of a smooth solution was established in Dai and Zhang [Arch. Rational Mech. Anal., {\bf 155}(2000), 277-298] up to the free boundary of vacuum. We prove that the vacuum boundary where the system is degenerate is the trivial coordinate axes.
Template Matching for Profile Measurement Based on Levenberg-Marquardt Algorithm  [PDF]
Qingxia Xu, Xiaodong Chai, Shubin Zheng, Wenfa Zhu, Lei Zhang
American Journal of Industrial and Business Management (AJIBM) , 2014, DOI: 10.4236/ajibm.2014.47045
Abstract:

This paper proposes the Levenberg-Marquardt algorithm to solve the problem of a big error while matching the measurement profile with the template profile. In order to achieve more accurate matching result, error function of the two profiles should be structured firstly. And the next step is optimizing the parameters of transform matrix of error function. To be specific, the error is about the corresponding point distance, and optimization parameters are the rotation variables and the translation variables of the transformation matrix. The experimental result of the system shows that using the method of template matching for profile measurement based on Levenberg-Marquardt algorithm is feasible.

Optimization of the A Constant for the SRK/T Formula  [PDF]
John C. Merriam, Eva Nong, Lei Zheng, Malka Stohl
Open Journal of Ophthalmology (OJOph) , 2015, DOI: 10.4236/ojoph.2015.53017
Abstract: Purpose: To evaluate the effect of axial length (AL) and the average preoperative keratometry (K) on the A constant in the SRK/T formula. Methods: The retrospective, comparative case series includes 635 eyes from 407 cataract patients from Columbia University Medical Center from January 2006 to August 2010, operated by a single surgeon using a temporal incision and the Acrysof SN60WF IOL (Alcon Laboratories, TX). Using the postoperative manifest refraction and biometry data, we calculated the precise A constant (Ap) necessary to yield the postoperative spherical equivalent for each eye. To optimize the A constant, we developed three regression models (linear, quadratic, and categorical in 7 AL groups) to relate these precise A constants to AL and K. We verified our method with another series of 45 eyes for which we calculated mean errors (defined as the difference between the spherical equivalent of the postoperative refraction and the predicted postoperative refraction) using the optimized and manufacturer’s suggested A constants. Results: There is a statistically significant relationship between AL (P < 0.001), K (P < 0.001) and the A constant. Ap increased as AL increased and as K decreased. In the validation data set, optimizing the A constant reduced mean errors from 0.50 D to 0.25 D and also reduced hyperopic refractive outcomes. Conclusions: The A constant for longer eyes with flatter corneas is larger than the A constant for shorter eyes with steeper corneas. Optimizing A constants using both AL and K improved the predictability of refractive outcomes without modification to the SRK/T formula.
The Constitutional Right Dimension of Civil Livelihood
民生问题的宪法权利之维

Zheng Lei,
郑磊

浙江大学学报(人文社会科学版) , 2008,
Abstract: Civil livelihood is a complex problem with multi-dimensions,which could be solved by normatively analyzing its internal structure through a"constitutional right-state obligation"device.In terms of the categories of constitutional rights,civil livelihood involves social rights, when liberal rights are also covered.Correspondingly,on the functions of constitutional rights,it mainly contains beneficial function when defensive function also exists.State obligation includes three aspects:assisting obligation,protection obligation and respect obligation.All this shows that the problem of civil livelihood needs a systematical consideration.
Monte Carlo simulations for two-dimensional Ising system far from equilibrium
LEI XiaoWei,
LEI
,XiaoWei,ZHENG,Ji,ZHAO,XiaoYu

科学通报(英文版) , 2007,
Abstract: With a dynamic Monte Carlo simulation, which is free of critical slowing down, the critical behavior of two-dimensional Ising model at non-equilibrium states is investigated. We focus on the two-time autocorrelation function A(t, t′) to identify the dynamic exponent z in two different evolution stages, quenched from a high temperature state and a completely ordered state to the critical state at T C, respectively. By using the heat-bath algorithm, the dynamic critical exponent is estimated as z ≈ 2.16. As a result, the universality of the scaling behavior is verified numerically, and the exponent λ C is determined complete by λ C = β/v for the evolutions from an initial completely ordered state. Supported by the Science and Technology Research Program of Municipal Education Committee of Chongqing of China (Grant No. KJ061208)
A Novel Sandwich Electrochemical Immunosensor Based on the DNA-Derived Magnetic Nanochain Probes for Alpha-Fetoprotein
Ning Gan,Liyong Jia,Lei Zheng
Journal of Analytical Methods in Chemistry , 2011, DOI: 10.1155/2011/957805
Abstract: One novel electrochemical immunosensor was constructed by immobilizing capture antibody of alpha-fetoprotein (AFP Ab1) on a nafion/nanogold-particle modified glassy carbon electrode. With a sandwich immunoassay, one DNA-derived magnetic nanoprobe, simplified as DNA/(ZMPs—HRP-AFP Ab2)n, was employed for the detection of AFP. The fabricated procedure of the proposed biosensor was characterized by cyclic voltammetry and electrochemical impedance spectroscopy. The performance and factors influencing the performance of the biosensor were also evaluated. Under optimal conditions, the developed biosensor exhibited a well-defined electrochemical behavior toward the reduction of AFP ranging from 0.01 to 200 ng/mL with a detection limit of 4 pg/mL (/=3). The biosensor was applied to the determination of AFP in serum with satisfactory results. It is important to note that the sandwich nanochainmodified electro-immunosensor provided an alternative substrate for the immobilization of other tumor markers.
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