Study of Teaching Model based on Cooperative Learning

Cooperative learning is a popular teaching method now in the world. This paper first discusses the teaching model based on cooperative learning, then analyzes the advantages of cooperative learning and at last proposes the steps of carrying out cooperative learning. It is necessary to introduce the teaching model based on cooperative learning into the teaching for training software talents of China.Key words: Cooperative Learning; Training Model; Teaching Refor

Long-rang Correlation for USD/EUR based on Semi-parametric Estimation

This paper chooses closing price return rate series of EUR/USD to study. Sample interval covers from 22th July 2005 to 15th Sep 2008(before the financial crisis) and from 16th September 2008 to 19th May 2010(after the financial crisis).The author put forward semi-parameter estimation methods (Standard GPH Method, Tapered GPH Method), and concluded through comparable analysis that: In the conditions of V using T0.5、T0.525、T0.55、T0.575、T0.6 samples, standard GPH and tapered GPH tests are adopted. The results show that Fractal dimension parameter d is significantly greater than 0 and the statistics are more than critical value of 1% level before financial crisis both EUR/USD. After financial crisis, the parameter has become smaller than that before financial crisis, which is near 0 significantly. In the long term, there is no trend or structural breaks in the exchange market. This study's conclusion was that long-term memory exists in daily return time series of EUR/USD become smaller after financial crisis. Key words: EUR/USD; semi-parameter estimation methods; financial crisi

Dynamic Impact Mechanism of Birth Rate and GDP in Liaoning Province

This paper's objective is to study the issue of impact mechanism of birth rate between Liaoning province and China integrating unit root test, cointegrating test, vector error correction model (VECM), generalized impulse response function and variance decomposition. After selecting the data of birth rate, infant mortality rate and real GDP per capita of Liaoning province and China, we’ve found that: (1) The log series of birth rate, infant mortality and real GDP per capita are integrated of order one; (2) Long-term co-integration relationships exist among these three series, and the impacts of infant mortality rate and GDP per capita on birth rate are more significant in Liaoning province; (3) According to VECM, the adjustment of birth rate in Liaoning province is 0.09067971446 while it is 0.463901315 in China, which means self- regulatory ability of birth rate in Liaoning province is relatively weak; (4) According to generalized impulse response function and variance decomposition in the short-term birth rate fluctuation of Liaoning isn’t affected by infant mortality rate and GDP per capita while in the national level the effect is great. The conclusions and suggestions are: (1) China is in the period of “Demographic window of opportunity” nowadays so high-speed economic growth and low birth rate are both necessary. China should improve professional education and training to build the harmonious society; (2) Remove obstacles of labor migration in order that the most active factor of production – labor force can flow into Liaoning freely, therefore, we can improve the allocative efficiency without a larger population.Key words: Population Bonus; Social Security System; Education and Training; Birth Rate; Vector Error Correction ModelRésumé: L'objectif de cet article est d'étudier le problème du mécanisme de l'impact du taux de natalité dans la province du Liaoning et en Chine, en intégrant le test de racine unitaire, le test de cointégration, le modèle à correction d'erreur vectorielle (MCEV), la fonction de réponse impulsionnelle généralisée et la décomposition de la variance. Après avoir sélectionné les données du taux de natalité, du taux de mortalité infantile et du PIB réel par habitant de la province de Liaoning et de la Chine, nous avons constaté que: (1) Les séries de logarithme du taux de natalité, du taux de mortalité infantile et du PIB réel par habitant sont intégrés dans le premier ordre; (2) Des relations de co-intégration à long terme existent entre ces trois séries, et les impacts du taux de mortalité infantile et du PIB par habitant sur le taux de natalité sont plus importants dans la province du Liaoning, (3) Selon MCEV, l'ajustement du taux de natalité dans la province de Liaoning est de 0,09067971446, alors qu'il est de 0,463901315 en Chine, ce qui signifie que la capacité d'auto-réglementation du taux de natalité dans la province de Liaoning est relativement faible; (4) Selon la fonction de réponse impulsionnelle généralisée et la décomposition de la variance à court terme, la fluctuation du taux de natalité du Liaoning n'est pas affectée par le taux de mortalité infantile et le PIB par habitant alors qu'au niveau national, l’impact est plus important. Les conclusions et les suggestions sont les suivantes: (1) Aujourd'hui, la Chine est en une période de "fenêtre démographique d'opportunité", donc une croissance économique rapide et un taux de natalité faible sont tous nécessaires. La Chine devrait améliorer l'éducation et la formation professionnelle pour construire une société harmonieuse; (2) Il faut supprimer les obstacles de la migration du travail afin que le facteur le plus actif de la production - la main-d'œuvre peut circuler librement dans la province du Liaoning, par conséquent, nous pouvons améliorer l'efficience allocative sans une population plus grande. Mots-clés: bonus de la population; système de sécurité sociale, éducation et formation; taux de natalité; modèle à correction d'erreur vectoriell

The simulation analysis of contact characteristics of biomimetic flexible surfaces

Based on the foot structure of the climbing biology and multivariate coupling bionic technology, the bionic flexible convex surface was designed and a 3D model was created using the digital modeling software. Finite Element Analysis software was used for contacting analysis to the bionic flexible convex foot structure in the state of dry friction and wet adhesion, and then studied frictional contact performance. The results of Finite Element Analysis shows that the contact stress of the convex is much larger than the stress of the area around it in the dry friction state and the deformation is mainly concentrated in the convex’s top. The friction between the hemispherical convex surface and the contact surface is the maximum and the cylindrical convex surface is the minimum. The friction between the bionic flexible convex structure and the solid contact surface in wet adhesion state is larger than dry state.Keywords: Bionic, flexible, contact, finite element, wet adhesio

Bis(2,5-dihydroxy­benzoato-κO)bis­(1,10-phenathroline-κ2 N,N′)cadmium(II) 1.25-hydrate

In the crystal structure of the title compound, [Cd(C7H5O4)2(C12H8N2)2]·1.25H2O, the Cd2+ cation is coordinated by two phenanthroline (phen) mol­ecules and two 2,5-dihydroxy­benzoate (dhba) anions in a distorted octa­hedral geometry. The centroid–centroid distances of 3.809 (2) and 3.680 (2) Å between nearly parallel pyridine rings of the phen ligands and the benzene rings of dhba anions indicate that the dhba anions are involved in π–π stacking in the crystal structure. The face-to-face separation of 3.35 (3) Å between parallel phen ring systems also suggests π–π stacking between adjacent complex mol­ecules. The crystal structure contains extensive O—H⋯O and C—H⋯O hydrogen bonding

Estimation of Asian Dust Aerosol Effect on Cloud Radiation Forcing Using Fu-Liou Radiative Model and CERES Measurements

The impact of Asian dust on cloud radiative forcing during 2003-2006 is studied by using the Earth's Radiant Energy Budget Scanner (CERES) data and the Fu-Liou radiative transfer model. Analysis of satellite data shows that the dust aerosol significantly reduced the cloud cooling effect at TOA. In dust contaminated cloudy regions, the 4-year mean values of the instantaneous shortwave, longwave and net cloud radiative forcing are -138.9, 69.1, and -69.7 Wm(sup -2), which are 57.0, 74.2, and 46.3%, respectively, of the corresponding values in more pristine cloudy regions. The satellite-retrieved cloud properties are significantly different in the dusty regions and can influence the radiative forcing indirectly. The contributions to the cloud radiation forcing by the dust direct, indirect and semi-direct effects are estimated using combined satellite observations and Fu-Liou model simulation. The 4-year mean value of combination of indirect and semi-direct shortwave radiative forcing (SWRF) is 82.2 Wm(sup -2), which is 78.4% of the total dust effect. The direct effect is only 22.7 Wm(sup -2), which is 21.6% of the total effect. Because both first and second indirect effects enhance cloud cooling, the aerosol-induced cloud warming is mainly the result of the semi-direct effect of dust

Solution processed molecular floating gate for flexible flash memories

Solution processed fullerene (C60) molecular floating gate layer has been employed in low voltage nonvolatile memory device on flexible substrates. We systematically studied the charge trapping mechanism of the fullerene floating gate for both p-type pentacene and n-type copper hexadecafluorophthalocyanine (F16CuPc) semiconductor in a transistor based flash memory architecture. The devices based on pentacene as semiconductor exhibited both hole and electron trapping ability, whereas devices with F16CuPc trapped electrons alone due to abundant electron density. All the devices exhibited large memory window, long charge retention time, good endurance property and excellent flexibility. The obtained results have great potential for application in large area flexible electronic devices