Showing papers by "Shanghai University published in 2007"
TL;DR: In this paper, the stability of an n-dimensional linear fractional differential equation with time delays was studied, where the delay matrix is defined in (R+n×n).
Abstract: In this paper, we study the stability of n-dimensional linear fractional differential equation with time delays, where the delay matrix is defined in (R+)n×n. By using the Laplace transform, we introduce a characteristic equation for the above system with multiple time delays. We discover that if all roots of the characteristic equation have negative parts, then the equilibrium of the above linear system with fractional order is Lyapunov globally asymptotical stable if the equilibrium exist that is almost the same as that of classical differential equations. As its an application, we apply our theorem to the delayed system in one spatial dimension studied by Chen and Moore [Nonlinear Dynamics29, 2002, 191] and determine the asymptotically stable region of the system. We also deal with synchronization between the coupled Duffing oscillators with time delays by the linear feedback control method and the aid of our theorem, where the domain of the control-synchronization parameters is determined.
748 citations
TL;DR: This paper further discusses the properties of three kinds of fractional derivatives: the Grunwald-Letnikov derivative, the Riemann-Liouville derivative and the Caputo derivative, and compares them with the classical derivative.
553 citations
TL;DR: In this paper, eight commercially harvested apple cultivars were analysed by gas chromatography and high-performance liquid chromatography, in particular the composition and level of sugars, organic acids, amino acids, phenolic compounds and fatty acids.
354 citations
TL;DR: A novel in-wheel motor is proposed, which artfully integrates a magnetic gear into a permanent-magnet brushless (PMBL) DC motor so that they can share a common PM rotor, hence offering both high efficiency and high power density.
Abstract: This paper proposes a novel in-wheel motor, which artfully integrates a magnetic gear into a permanent-magnet brushless (PMBL) DC motor so that they can share a common PM rotor, hence offering both high efficiency and high power density. Moreover, the low-speed requirement for direct driving and the high-speed requirement for compact motor design can be achieved simultaneously. A 2-kW 600/4400-rpm magnetic-geared outer-rotor PMBL DC motor is designed and analyzed, which is particularly suitable for battery-powered electric motorcycles
348 citations
TL;DR: In this paper, the phase transformation of rutile TiO 2 single crystal was observed and the anatase phase content increased to a constant with increasing of infrared femtosecond (fs) pulse laser irradiation time.
263 citations
TL;DR: Numerical calculations for two networks with different topological connections are presented and interesting synchronization and desynchronization alternately appear with increasing value of the coupling strength.
Abstract: We study synchronization for two unidirectionally coupled networks. This is a substantial generalization of several recent papers investigating synchronization inside a network. We derive analytically a criterion for the synchronization of two networks which have the same (inside) topological connectivity. Then numerical examples are given which fit the theoretical analysis. In addition, numerical calculations for two networks with different topological connections are presented and interesting synchronization and desynchronization alternately appear with increasing value of the coupling strength.
258 citations
TL;DR: Using [14C-taurine]-multi-walled CNTs (MWCNTs) as tracers, this work shows the biodistribution and translocation pathways of MWCNTs in mice by three different routes and indicates low liver acute toxicity of M WCNTs.
252 citations
TL;DR: The content of PEG, the molecular weight of P EG, and the sonication time were confirmed to be the crucial factors determining the formation of one-dimensional CeO2 nanorods.
Abstract: Polycrystalline CeO2 nanorods 5−10 nm in diameter and 50−150 nm in length were synthesized via ultrasonication using polyethylene glycol (PEG) as a structure-directing agent at room temperature The properties of the CeO2 nanorods were characterized by TEM, EDS, XRD, XPS, FT-IR, TG, BET, and UV−vis spectroscopy Various reaction parameters, such as the content of PEG, the molecular weight of PEG, the concentration of KOH, the pH value, and the sonication time, were investigated by a series of control experiments The content of PEG, the molecular weight of PEG, and the sonication time were confirmed to be the crucial factors determining the formation of one-dimensional CeO2 nanorods A possible ultrasonic formation mechanism has been suggested to explain the formation of CeO2 nanorods
249 citations
TL;DR: In this paper, a modified projective synchronization is proposed to acquire a general kind of proportional relationships between the drive and response systems, and a sufficient condition is attained for the stability of the error dynamics, and is applied to guiding the design of the controllers.
Abstract: A modified projective synchronization is proposed to acquire a general kind of proportional relationships between the drive and response systems. From rigorously control theory, a sufficient condition is attained for the stability of the error dynamics, and is applied to guiding the design of the controllers. Finally, we take Lorenz system as an example for illustration and verification.
233 citations
228 citations
TL;DR: Results from a 24‐month randomized double‐blind placebo‐controlled clinical trial showed that Epimedium‐derived phytoestrogen flavonoids were able to exert beneficial effects on preventing bone loss in late postmenopausal women, without resulting in a detectable hyperplasia effect on the endometrium.
Abstract: Epimedium brevicornum maxim, a nonleguminous medicinal plant, has been found to be rich in phytoestrogen flavonoids. Results from a 24-month randomized double-blind placebo-controlled clinical trial showed that Epimedium-derived phytoestrogen flavonoids were able to exert beneficial effects on preventing bone loss in late postmenopausal women, without resulting in a detectable hyperplasia effect on the endometrium.
Introduction: We performed a 24-mo randomized double-blind placebo-controlled clinical trial for evaluating the effect of the Epimedium-derived phytoestrogen flavonoids (EPFs) on BMD, bone turnover biochemical markers, serum estradiol, and endometrial thickness in postmenopausal women.
Materials and Methods: One hundred healthy late postmenopausal women, with a natural menopausal history within 10 ∼18 yr and with a BMD T-score at the lumbar spine between −2 and −2.5 SD, were randomized into EPF treatment group (n = 50; a daily dose of 60 mg Icariin, 15 mg Daidzein, and 3 mg Genistein) or placebo control group (n = 50). All participants received 300 mg element calcium daily. BMD, bone turnover biochemical markers, serum estradiol, and endometrial thickness were measured at baseline and 12 and 24 mo after intervention.
Results: Eighty-five participants completed the trial. The patterns of BMD changes were significantly different between the EPF treatment group and placebo control group by repeated-measures ANOVA (p = 0.045 for interaction between time and group at femoral neck; p = 0.006 for interaction between time and group at lumbar spine). BMD was found with a decreased tendency in the placebo control group at 12 (femoral neck: −1.4%, p = 0.104; lumbar spine: −1.7%, p = 0.019) and 24 mo (femoral neck: −1.8%, p = 0.048; lumbar spine: −2.4%, p = 0.002), whereas EPF treatment maintained BMD at 12 (femoral neck: 1.1%, p = 0.285; lumbar spine:1.0%, p = 0.158) and 24 mo (femoral neck: 1.6%, p = 0.148; lumbar spine: 1.3%, p = 0.091). The difference in lumbar spine between the two groups was significant at both 12 (p = 0.044) and 24 mo (p = 0.006), whereas the difference in the femoral neck was marginal at 12 mo (p = 0.061) and significant at 24 mo (p = 0.008). Levels of bone biochemical markers did not change in the placebo control group. In contrast, EPF intervention significantly decreased levels of deoxypyrdinoline at 12 (−43%, p = 0.000) and 24 mo (−39%, p = 0.000), except for osteocalcin at 12 (5.6%, p = 0.530) and 24 mo (10.7%, p = 0.267). A significant difference in deoxypyrdinoline between the two groups was found at both 12 (p = 0.000) and 24 mo (p = 0.001). Furthermore, neither serum estradiol nor endometrial thickness was found to be changed in either groups during the clinical trial.
Conclusions: EPFs exert a beneficial effect on preventing bone loss in late postmenopausal women without resulting in a detectable hyperplasia effect on the endometrium.
TL;DR: In this paper, the refining mechanism of the electric current pulse (ECP) on the solidification structure of pure aluminum was systematically investigated by properly designed experiments, and it was shown that the solidization structure cannot be refined by exerting an ECP on the high temperature liquid phase, indicating that the ECP has no inoculation effect on the liquid metal.
TL;DR: A general model of complex delayed dynamical networks withImpulsive effects is formulated, which can well describe practical architectures of more realistic complex networks related to impulsive effects.
Abstract: The present paper is mainly concerned with the issues of synchronization dynamics of complex delayed dynamical networks with impulsive effects. A general model of complex delayed dynamical networks with impulsive effects is formulated, which can well describe practical architectures of more realistic complex networks related to impulsive effects. Based on impulsive stability theory on delayed dynamical systems, some simple but less conservative criterion are derived for global synchronization of such dynamical network. It is shown that synchronization of the networks is heavily dependent on impulsive effects of connecting configuration in the networks. Furthermore, the theoretical results are applied to a typical SF network composing of impulsive coupled chaotic delayed Hopfield neural network nodes, and are also illustrated by numerical simulations.
TL;DR: It is easy to operate in HPLC-ICP-MS for mercury species determination since the extracted solution can be directly injected into the HPLC column without pH adjustment and the memory effect of mercury in the ICP-MS measurement system can be reduced.
TL;DR: In this paper, the authors investigated solid phase photocatalytic degradation of polyethylene (PE) plastic with TiO2 in the ambient air under solar and ultraviolet light irradiation.
Abstract: This paper investigated solid-phase photocatalytic degradation of polyethylene (PE) plastic with TiO2 in the ambient air under solar and ultraviolet light irradiation. The photodegradation of the composite plastic was compared with that of pure PE through weight loss monitoring, scanning electron microscopic (SEM) analysis, gas chromatography (GC), FT-IR spectroscopy and X-ray photoelectron spectroscopy (XPS). PE-TiO2 composite plastic can be efficiently decomposed and the main products are CO2 and water. The weight-loss of PE-TiO2 (1 wt%) film reached 42% under solar irradiation for 300 h. The degradation rate can be controlled by changing the content of TiO2 nanoparticles in PE plastic. The degradation of composite plastic initiated on PE-TiO2 interface and then extended into polymer matrix induced by the diffusion of the reactive oxygen species generated on TiO2 particle surface. The present study demonstrates that the polymer-TiO2 compositing is a practical and promising way to degrade the plastic waste under solar light without any pollution.
TL;DR: This study confirms that BDE-209 is released to the environment and can bioaccumulate in the blood of electronic waste dismantling workers, and extensive occupational exposure to PBDEs leads to elevated concentrations of all PBDE congeners in serum.
TL;DR: It was found that after irradiating the microperoxidase/zinc oxide nanoparticles co-modified electrode with UV light for 4h, the catalytic ability of microper oxidase could be greatly promoted, which could be beneficial to developing more sensitive hydrogen peroxide biosensors.
TL;DR: In this article, an elastoplastic model for predicting the hydraulic and stress-strain behavior of unsaturated soils is presented, which takes into account the effect of the degree of saturation on stress−strain behaviour, the void ratio on water-retention, and the influence of suction.
TL;DR: The analytical variation of the GC-MS analytical method was smaller than the biological variation in the rat urine samples, proving the suitability of the method to analyze differences in the metabonome of a living system with perturbed metabolic network.
TL;DR: In this article, the effect of TEMC on the cellular liquid-solid interface and the cellular morphology was evaluated at different scales and the result showed that the effect is different for different scales.
TL;DR: In this paper, a surface modification method by grafting L-lactic acid oligomer onto the surface silanol groups of silica nanoparticles has been developed, and the surface grafting reaction is confirmed by IR and Si-29 MAS NMR analyses.
TL;DR: The laboratory findings and clinical trial studies of Chinese herbal medicines (particularly small molecule compounds) for the treatment of liver disease ranging from fibrosis to liver cancer are discussed.
Abstract: Liver disease afflicts over 10% of the world population. This includes chronic hepatitis, alcoholic steatosis, fibrosis, cirrhosis and hepatocellular carcinoma (HCC), which are the most health-threatening conditions drawing considerable attention from medical professionals and scientists. Patients with alcoholism or viral hepatitis are much more likely to have liver cell damage and cirrhosis, and some may eventually develop HCC, which is unfortunately, and very often, a fatal malignancy without cure. While liver surgery is not suitable in many of the HCC cases, patients are mostly given palliative support cares or transarterial chemoembolization or systemic chemotherapies. However, HCC is well known to be a highly chemoresistant tumour, and the response rate is <10-20%. To this end, alternative medicines are being actively sought from other sources with hopes to halt the disease's progression or even eliminate the tumours. Traditional Chinese herbal medicine has begun to gain popularity worldwide for promoting healthcare as well as disease prevention, and been used as conventional or complementary medicines for both treatable and incurable diseases in Asia and the West. In this article, we discuss the laboratory findings and clinical trial studies of Chinese herbal medicines (particularly small molecule compounds) for the treatment of liver disease ranging from fibrosis to liver cancer.
TL;DR: In this article, the effects of hydrogen-charging on anodic dissolution of pipe steel under near-neutral pH condition were studied by electrochemical techniques, and the hydrogen effect was attributed to the alteration of chemical potential and exchange current density of steel.
TL;DR: In this paper, a multi-period energy acquisition model for a distribution company (Disco) with distributed generation and interruptible load (IL) in a day-ahead electricity market is presented.
Abstract: This paper presents a multiperiod energy acquisition model for a distribution company (Disco) with distributed generation (DG) and interruptible load (IL) in a day-ahead electricity market. Assuming that cost information for individual generation companies (Gencos) and Discos is known, the Disco's energy acquisition strategy is modeled as a bilevel optimization problem with the upper subproblem representing individual Discos and the lower subproblem representing the independent system operator (ISO). The upper subproblem maximizes individual Discos' revenues. The lower subproblem simulates the ISO's market clearing problem that minimizes generation costs and compensation costs for interrupting load. The bilevel problem is solved by a nonlinear complementarity method. An 8-bus system is employed to illustrate the proposed model and algorithm. In particular, the roles of DGs and ILs to alleviate congestion are analyzed
TL;DR: In this paper, a three-dimensional elastoplastic constitutive model for predicting the hydraulic and mechanical behavior of unsaturated soils is presented based on experimental results obtained from a series of controlled-suction triaxial tests on unsaturated compacted clay.
Abstract: This paper presents a three-dimensional elastoplastic constitutive model for predicting the hydraulic and mechanical behaviour of unsaturated soils It is based on experimental results obtained from a series of controlled-suction triaxial tests on unsaturated compacted clay with different initial densities Hydraulic hysteresis in the water-retention behaviour is modelled as an elastoplastic process, with the elastic part modelled by a series of scanning curves and the elastoplastic part modelled by the main drying and wetting curves The effect of void ratio on the water-retention behaviour is studied using data obtained from controlled-suction wetting–drying cyclic tests on unsaturated compacted clay with different initial densities The effect of the degree of saturation on the stress–strain-strength behaviour and the effect of void ratio on the water-retention behaviour are considered in the model, as is the effect of suction on the hydraulic and mechanical behaviour The initial density dependency of the compacted soil behaviour is modelled by experimental relationships between the initial density and the corresponding yield stress and, thereby, between the initial density and the normal compression line The model is generalized to three-dimensional stress states by assuming that the shapes of the failure and yield surfaces in the deviatoric stress plane are given by the Matsuoka–Nakai criterion Model predictions of the stress–strain and water-retention behaviour are compared with those obtained from triaxial tests with different initial densities under isotropic compression, triaxial compression and triaxial extension, with or without variation in suction The comparisons indicate that the model accurately predicts the hydraulic and mechanical behaviour of unsaturated compacted soils with different initial densities using the same material constant Copyright © 2006 John Wiley & Sons, Ltd
TL;DR: In this paper, the properties of the CeO2 nanotubes were characterized by scanning electron microscopy (SEM), TEM, XRD, X-ray photoelectron spectrum (XPS), thermogravimetry and differential thermal analysis (TG-DTA).
TL;DR: In this paper, a simple but efficient method for chaos synchronization of fractional differential systems is proposed, which is based upon the stability criterion of linear FFD systems. But this method is not suitable for the case of finite differential systems.
Abstract: A simple but efficient method for chaos synchronization of fractional differential systems is proposed, which is based upon the stability criterion of linear fractional differential systems. Using this new method, chaos synchronization for fractional Lorenz, Rossler, and Chen systems are implemented.
TL;DR: A new conjugacy condition is established for CG methods and several new CG methods are proposed that take both the gradient and function value information and under some suitable conditions, the global convergence is achieved for these methods.
TL;DR: In this article, the authors focus on the constant elasticity of variance (CEV) model for studying a defined-contribution pension plan where benefits are paid by annuity and present the process by which the Legendre transform and dual theory can be applied to find an optimal investment policy for a participant's whole life in the pension plan.
Abstract: The paper focuses on the constant elasticity of variance (CEV) model for studying a defined-contribution pension plan where benefits are paid by annuity. It also presents the process by which the Legendre transform and dual theory can be applied to find an optimal investment policy for a participant’s whole life in the pension plan. Finally, it reveals two explicit solutions for the logarithm utility function in two different periods (before and after retirement). Hence, the optimal investment strategies in the two periods are obtained.
TL;DR: A ligand-conjugated, NIR-labeled LDL is synthsized that enables the first in vivo demonstration of rerouting LDL from LDL receptors to selected alternate receptors, thus drastically expanding the range of using LDL particles as nanocarriers for in vivo cancer imaging and treatment.
Abstract: LDL particles are high-capacity nanocarriers with precisely controlled size and are naturally biocompatible, biodegradable, and nonimmunogenic. However, their utilities as drug carriers are limited by the narrow purview of LDL receptor-positive tumors. Here, we synthsized a ligand-conjugated, NIR-labeled LDL that enables the first in vivo demonstration of rerouting LDL from LDL receptors to selected alternate receptors, thus drastically expanding the range of using LDL particles as nanocarriers for in vivo cancer imaging and treatment.