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Search Results: 1 - 10 of 102196 matches for " CHEN Jian "
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Generalized Darboux Transformation and Rational Solutions for the Nonlocal Nonlinear Schr?dinger Equation with the Self-Induced Parity-Time Symmetric Potential  [PDF]
Jian Chen
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.35065
Abstract: In this paper, I construct a generalized Darboux transformation for the nonlocal nonlinear Schrodinger equation with the self-induced parity-time symmetric potential. The N-order rational solution is derived by the iterative rule and it can be expressed by the determinant form. In particular, I calculate first-order and second-order rational solutions and obtain their figures according to different parameters.
Toxicity and Efficacy of Two Emulsifiable Concentrates of 2-Tridecanone against Red Imported Fire Ants  [PDF]
Jian Chen
Advances in Entomology (AE) , 2016, DOI: 10.4236/ae.2016.41006
Abstract: 2-tridecanone is a major constitute of defensive secretion in tawny crazy ants, Nylanderia fulva that is an ant species reported to be able to displace red imported fire ants, Solenopsis invicta in the field. 2-tridecanone was proven to be toxic to S. invicta. Although 2-tridecanone is commercially available, utilization of this naturally occurring compound in fire ant management has received little attention. In this study, toxicity and efficacy of two 2-tridecanone formulations were assessed against S. invicta. Two emulsifiable concentrates were prepared using 2-tridecanone as an active ingredient, vegetable oil as a solvent and polyoxyethylene tridecyl ether as a surfactant. Piperonyl butoxide (PBO) was used as a synergist in one formulation. Both formulations showed significant toxicity in laboratory bioassays. In a field trial, at application rate of 5.28 mL/L and 14 days after mound drench treatment, 100% control was achieved for formulation with PBO and 90% control for the formulation without PBO. In conclusion, both formulations had significant efficacy against S. invicta. Due to the low mammalian toxicity of 2-tridecanone, no involvement of hazardous synthetic organic solvents, no phytotoxicity at applied concentrations, and relatively low cost, both formulations are promising alternatives to commercial insecticide products for fire ant mound drench. The outstanding efficacy of both formulations observed in this study warrants further research on their efficacy against other pest insects.
Eigensolution Variability of Asymmetric Damped Systems  [PDF]
Jian Chen, Yuegang Tan
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2012, DOI: 10.4236/jasmi.2012.23023
Abstract: The characterization of energy dissipation or damping in rotor dynamic model is of fundamental importance. Noise and vibration are not only uncomfortable to the users, but also may lead to fatigue, fracture and even failure. During the design process of asymmetric damped systems, it is often required to make changes in the design variables such that the design is optimal. This paper is aimed at developing computationally efficient numerical methods for parametric sensitivity analysis. The algebraic method considered here computes the eigenvector sensitivity by assembling the derivatives of eigenproblems and the additional constraints into an algebraic equation. The coefficient matrix may be ill-conditioned since the elements of it are not all of the same order of magnitude. In this study, a new algebraic method is presented to compute the eigensolution variability of asymmetric damped systems. Some weight constants are introduced such that the proposed method is well-conditioned. The method is very compact and highly efficient, and the numerical stability is also demonstrated. Moreover, several special cases can be presented based on the similar idea of the proposed method. Finally, two numerical examples show the validity of the proposed method.
A Study of γ-Fe2O3 Nanoparticles Modified Using ZnCl2 during Synthesis  [PDF]
Longlong Chen, Jian Li
Advances in Materials Physics and Chemistry (AMPC) , 2013, DOI: 10.4236/ampc.2013.31A004

Surface modification of γ-Fe2O3 nanoparticles synthesized by a chemically induced transition has been attempted by adding ZnCl2 during synthesis. The structure of the modified particles was studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The experimental results showed that ZnFe2O4 grew epitaxially on the γ- Fe2O3 crystallites to form composite nanoparticles with the spinel structure, on which FeCl3 might be adsorbed. The apparent grain size dc estimated by XRD using the Scherrer equation was larger rather than smaller than the average particle size measured by TEM. This paradox can be explained by the effect of absorption in the coating heterolayer.

Value Added Decomposition of Chinese Provincial Exports and Its Assessment of True Comparative Advantage: A Case Study of Manufacturing in Jiangsu Province  [PDF]
Hui Chen, Jian Xu
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.73032
Abstract: The Sino-US trade conflict, the collapse of economic globalization and the reconstruction of global value chains have enhanced the necessity and urgency of building an open and connected, self-controllable, domestic value chain. Jiangsu is a major province and a large open province. The goal, path and measures for Jiangsu to build an independent and controllable advanced manufacturing system will have typical reference value. Based on the KWW trade value added decomposition framework, the World Input-Output Table (WIOT) and the inter-regional input-output tables of 30 provinces in China, Jiangsu’s return domestic value added, foreign value added, province value added and other provinces’ value added in Jiangsu’s manufacturing exports are estimated. Meanwhile, the regional linkages and changes of Jiangsu’s manufacturing exports with the rest of the provinces are also analyzed. The results show that the value added of imports from Jiangsu exports is higher than that of other provinces, which indicates that the “foreign circulation” of Jiangsu’s economy is stronger than “domestic circulation” though the situation is always changing in recent years. The Yangtze River Delta region is the core space for Jiangsu to build manufacturing industry chain. The Yangtze River Economic Belt and the Huaihai Economic Zone, which is the part of new Silk Road, are two important extended spaces for Jiangsu to build up NVC. Finally, On the basis of the decomposition of export value added, the industries with real comparative advantages in 16 major manufacturing industries in Jiangsu Province are evaluated. Both the advantages and disadvantages of Jiangsu’s value chain upgrading at the industrial level are unveiled.
Working Memory and Functional Neuroimaging in Patients with Depression  [PDF]
Chaoqun Chen, Jian Chen, Liangtie Dai
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.612140
Abstract: Numerous studies have demonstrated that patients suffering from depression present impairment in working memory. This paper firstly introduced the concept of working memory, and then elucidated the deficits of working memory of patients with depression. It also reviewed the neuroimaging studies of working memory in patients with depression. In the final part, we further summarized the future research orientations. In short, exploration of working memory on the regulative mechanisms of depression and figuring out that working memory impairment is the cause or the result of depressive symptoms will be the core problem that the future research needs to address.
Progress in experimental research on apoptosis of hepatic cancer cells induced by Chinese herbs
Zhong Xi Yi Jie He Xue Bao , 2004,
Effects of Matrine Injection on T-lymphocyte subsets of patients with malignant tumor after gamma knife radiosurgery
Zhong Xi Yi Jie He Xue Bao , 2006,
Toxicity of newly isolated piperideine alkaloids from the red imported fire ant, Solenopsis invicta Buren, against the green peach aphid, Myzus persicae (Sulzer)  [PDF]
Tahir Rashid, Jian Chen, Paul McLeod
Advances in Entomology (AE) , 2013, DOI: 10.4236/ae.2013.12005
Abstract: The green peach aphid, Myzuspersicae (Sulzer), is a major insect pest of many agronomic and horticultural crops and is distributed worldwide. Aphid management is often based on application of insecticides. However, the aphid is now resistant to many of these and much interest has recently developed in identification of novel alternative insecticides. Venom isolated from the red imported fire ant, Solenopsisinvicta Buren, is composed of two groups of alkaloids, piperidines and piperideines, and has shown activity against many organisms including fungi, bacteria, mites and several insects. Prior to the study reported herein, no information on the venom’s
activity to Myzuspersicae has been reported. Both of the alkaloids were active against M.persicae. The 24 h LC50 values were116.6 and 91.5 ppm for the piperideine and piperidine extracts, respectively. Based on overlap of the 95% fiducial limits the LC50 values for the two alkaloids did not significantly differ. At the high dosages, mortality occurred in as few as four hours and all treated aphids were dead by six hours. Little additional mortality was detected in the 48-hobservation. Both piperideine and piperidine extracts isolated from red imported fire ant venom possess sufficient activity to cause death of green peach aphids and at high dosages, death occurs rapidly. In the search for new replacements to synthetic insecticides, these extracts may offer a novel but potentially successful alternative.

Network Competence’s Impact on Service Innovation Performance: Mediating Role of Relationship Learning  [PDF]
Zhaoquan Jian, Chen Wang, Xiande Zhao
Journal of Service Science and Management (JSSM) , 2013, DOI: 10.4236/jssm.2013.64029

In the unfolding knowledge-based economy, services do matter. But while they increasingly seem to play a pivotal role in innovation processes, there has been little systematic analysis of this role. Combined with the existing literatures, based on the service science theory, network competence theory and relationship learning theory, this paper analyzes the service innovation and the service innovation performance thoroughly. The paper constructs a structure equation model containing an intermediary variable. Through an empirical test of 243 enterprises of South China, this paper draws the following conclusions: 1) network competence has a positive impact on service innovation performance; 2) network competence has a significantly positive impact on relationship learning; 3) relationship learning has a positive impact on service innovation performance; 4) relationship learning plays a mediating role between the relationship of network competence and service innovation performance. This paper provides beneficial guidance for service innovation activities and strengthens the competitive advantage of service industry.

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