Aim To investigate the melting behavior of polyamide 6 in polyamide 6/polyethy lene blends crystallized from amorphous state. Methods DSC was used to test effects of annealing temperature, annealing time, DS...Aim To investigate the melting behavior of polyamide 6 in polyamide 6/polyethy lene blends crystallized from amorphous state. Methods DSC was used to test effects of annealing temperature, annealing time, DSC scan rate, and the step wise annealing on the melting peaks of the ice water quenched specimens. Results and Conclusion Varied melting peaks of PA6 component were obtained. The degree of perfection and the crystallization degree of PA6 crystals decreased in the blends, and the crystallization degree of PA6 increased with the increasing of the annealing time. The height of the upper melting peak of reference PA6 is higher than that in blends.展开更多
Aim To investigate the multiple melting behavior of polyamide 6(PA 6) in polyamide 6/linear low density polyethylene blends crystallized from the crystal amorphous state. Methods\ The effects of annealing tempera...Aim To investigate the multiple melting behavior of polyamide 6(PA 6) in polyamide 6/linear low density polyethylene blends crystallized from the crystal amorphous state. Methods\ The effects of annealing temperature, annealing time, heating rate, and the step wise annealing were measured by DSC. Results and Conclusion\ There exists a critical heating rate affecting the middle temperature melting peak. When annealed at the temperature close to the melting peak, the main melting peak of PA 6 shifted to a higher temperature. Within a short time, annealing time has much effect on neat PA 6 but little effect on PA 6 in the blends. Addition of PE results in a decreasing in the height of melting peak. These phenomenon show that the melting behavior of PA 6 was affected by PE, compatibilizer, as well as thermal treatment.展开更多
The Cauchy problem for the nonlinear wave equation with a critical potential type of damping coefficient（1＋│x│）-1 and a nonlinearity │u│p-1u is studied.The total energy decay estimates of the global solutions a...The Cauchy problem for the nonlinear wave equation with a critical potential type of damping coefficient（1＋│x│）-1 and a nonlinearity │u│p-1u is studied.The total energy decay estimates of the global solutions are obtained by using multiplier techniques to establish identity ddtE（t）＋F（t）=0 and skillfully selecting f（t）,g（t）,h（t）when the initial data have a compact support.Using the similar method,the Cauchy problem for the nonlinear wave equation with a critical potential type of damping coefficient（1＋│x│＋t）-1 and a nonlinearity │u│p-1u is studied,similar solutions are obtained when the initial data have a compact support.展开更多
Nylon 10 T and Nylon 10T/1010 samples were synthesized by direct melt polymerization. The non-isothermal crystallization kinetics of Nylon 10 T and Nylon 10T/1010 was investigated by means of differential scanning cal...Nylon 10 T and Nylon 10T/1010 samples were synthesized by direct melt polymerization. The non-isothermal crystallization kinetics of Nylon 10 T and Nylon 10T/1010 was investigated by means of differential scanning calorimetry(DSC). Jeziorny equation and Mo equation were applied to describe the non-isothermal crystallization kinetics of the Nylon 10 T and the Nylon 10T/1010. The activation energies for non-isothermal crystallization were obtained by Vyazovkin's method and Friedman's method, respectively. These results showed that Jeziorny equation and Mo equation well described the non-isothermal crystallization kinetics of the Nylon 10 T and the Nylon 10T/1010. It was found that the values of the activation energy for non-isothermal crystallization of the Nylon 10T/1010 were lower than those of the Nylon 10 T at a given temperature or relative crystallinity degree,which revealed that crystallization ability of the Nylon 10T/1010 was higher. The crystal morphology was observed by means of a polarized optical microscope(POM) and X-ray diffraction(XRD). It was found that the addition of sebacic acid comonomer not only did not change the crystal form of the Nylon 10 T, but also significantly increased the number and decreased the size of spherulites. Comparing with the Nylon 10 T, the crystallization rate was increased with the addition of the sebacic acid comonomer.展开更多
The Leibniz-Hopf algebra is the free associative Z - algebra with one generator in each positive degree and coproduct is given by the Cartan formula. It has been also known as the ＇ring ofnoncommutative symmetric fun...The Leibniz-Hopf algebra is the free associative Z - algebra with one generator in each positive degree and coproduct is given by the Cartan formula. It has been also known as the ＇ring ofnoncommutative symmetric functions＇ [1], and to be isomorphic to the Solomon Descent algebra [ 12]. This Hopf algebra has links with algebra,topology and combinatorics. In this article we consider another approach of proof for the antipode formula in the Leibniz-Hopf algebra by using some properties of words in [2].展开更多
The Republic of Armenia, as a world superpower in chess, is engaged in continuous development and implementation of specific strategic programmes which are aimed not only at providing high achievements in chess, but a...The Republic of Armenia, as a world superpower in chess, is engaged in continuous development and implementation of specific strategic programmes which are aimed not only at providing high achievements in chess, but also at： （1） modernizing the educational sphere in the Republic of Armenia; （2） increasing the quality indexes of chess education--as a basic resource in the context of global educational system; （3） considerably deepening education subjects＇ cognitive interests towards education through the possibilities provided by chess; （4） developing learners＇ educational-cognitive motivation; and （5） creating conditions for activating learners＇ mental potential and the abilities to expose them, as well as promoting the awareness of the social value of chess in interpersonal relations. The contextual factors of teaching and learning chess in primary schools of Republic of Armenia have been revealed and presented in this paper. A number of conclusions and recommendations for policy makers are considerably made based on analysis of big research data.展开更多
During the Second World War, the Albanian communist leadership strengthened its political power by establishing close ties with the communist leadership of the Communist Party of Yugoslavia that was also the godfather...During the Second World War, the Albanian communist leadership strengthened its political power by establishing close ties with the communist leadership of the Communist Party of Yugoslavia that was also the godfather in the creation of the Albanian Communist Party on November 8, 1941. The article will argue that the relationship of the Albanian Communist Party with other communist parties including the Yugoslav one and the management of the internal member＇s relations was motivated by the quest for power rather than the ideological motives. Hoxha was largely responsible for Albania＇s virtual isolation from the world. Little interest, understanding combined with negligence of the Western comprehension of the grip of Stalinism in Albania left the country to adhere Stalinism until the end of Communism in the 1990s.展开更多
This paper presents an analytical method for determining the steady state response of blade with dry friction damper. A complete vibration cycle is divided into four successive intervals. The system possesses linear v...This paper presents an analytical method for determining the steady state response of blade with dry friction damper. A complete vibration cycle is divided into four successive intervals. The system possesses linear vibration characteristic during each of these intervals, which can be determined by using analytical solution forms. An analytical solution of the system periodic motion can be formed by combining the four intervals’ solutions. Numerical simulation shows that there are two response peaks in passage through the resonant frequencies of the system without the friction damper and with the friction damper fully stuck respectively. The amplitude of the first peak can be reduced up to 90% by adjusting the value of normal pressure force between the damper’s contacting surfaces. Whereas to determine the optimum pressure force, reduction of amplitudes of two peaks should be considered together.展开更多
Known data on the distribution of Alliocera graeca Saunders, 1845 and Ber＆ chalybata （Forster, 1771） in Europe are summarized. A. graeca has been reliable recorded from Albania, Croatia and Greece. B. chalybata has...Known data on the distribution of Alliocera graeca Saunders, 1845 and Ber＆ chalybata （Forster, 1771） in Europe are summarized. A. graeca has been reliable recorded from Albania, Croatia and Greece. B. chalybata has been reliable recorded from Austria, Belgium, Bulgaria, Czech Republic, Denmark, England, Finland, France, Germany, Hungary, Ireland, Italy, Netherlands, Norway, Poland, Roumania, Russia, Slovakia, Sweden, Switzeland. A. graeca and B. chalybata, known as European species, are new records for the Turkish Fauna. In this study, the female ofA. graeca and the female ofB. chalybata are presented and photographs of two species are accompanied. Distribution of these species treated is briefly discussed.展开更多
文摘Aim To investigate the melting behavior of polyamide 6 in polyamide 6/polyethy lene blends crystallized from amorphous state. Methods DSC was used to test effects of annealing temperature, annealing time, DSC scan rate, and the step wise annealing on the melting peaks of the ice water quenched specimens. Results and Conclusion Varied melting peaks of PA6 component were obtained. The degree of perfection and the crystallization degree of PA6 crystals decreased in the blends, and the crystallization degree of PA6 increased with the increasing of the annealing time. The height of the upper melting peak of reference PA6 is higher than that in blends.
文摘Aim To investigate the multiple melting behavior of polyamide 6(PA 6) in polyamide 6/linear low density polyethylene blends crystallized from the crystal amorphous state. Methods\ The effects of annealing temperature, annealing time, heating rate, and the step wise annealing were measured by DSC. Results and Conclusion\ There exists a critical heating rate affecting the middle temperature melting peak. When annealed at the temperature close to the melting peak, the main melting peak of PA 6 shifted to a higher temperature. Within a short time, annealing time has much effect on neat PA 6 but little effect on PA 6 in the blends. Addition of PE results in a decreasing in the height of melting peak. These phenomenon show that the melting behavior of PA 6 was affected by PE, compatibilizer, as well as thermal treatment.
基金The National Natural Science Foundation of China(No.10771032)
文摘The Cauchy problem for the nonlinear wave equation with a critical potential type of damping coefficient（1＋│x│）-1 and a nonlinearity │u│p-1u is studied.The total energy decay estimates of the global solutions are obtained by using multiplier techniques to establish identity ddtE（t）＋F（t）=0 and skillfully selecting f（t）,g（t）,h（t）when the initial data have a compact support.Using the similar method,the Cauchy problem for the nonlinear wave equation with a critical potential type of damping coefficient（1＋│x│＋t）-1 and a nonlinearity │u│p-1u is studied,similar solutions are obtained when the initial data have a compact support.
基金Supported by the National Science and Technology Support Program of China(No.2013BAE02B01)the Special Project on the Integration of Industry,Education and Research of Guangdong Province(No.2013B090500003)the Commissioner Workstation Project of Guangdong Province(No.2014A090906002)
文摘Nylon 10 T and Nylon 10T/1010 samples were synthesized by direct melt polymerization. The non-isothermal crystallization kinetics of Nylon 10 T and Nylon 10T/1010 was investigated by means of differential scanning calorimetry(DSC). Jeziorny equation and Mo equation were applied to describe the non-isothermal crystallization kinetics of the Nylon 10 T and the Nylon 10T/1010. The activation energies for non-isothermal crystallization were obtained by Vyazovkin's method and Friedman's method, respectively. These results showed that Jeziorny equation and Mo equation well described the non-isothermal crystallization kinetics of the Nylon 10 T and the Nylon 10T/1010. It was found that the values of the activation energy for non-isothermal crystallization of the Nylon 10T/1010 were lower than those of the Nylon 10 T at a given temperature or relative crystallinity degree,which revealed that crystallization ability of the Nylon 10T/1010 was higher. The crystal morphology was observed by means of a polarized optical microscope(POM) and X-ray diffraction(XRD). It was found that the addition of sebacic acid comonomer not only did not change the crystal form of the Nylon 10 T, but also significantly increased the number and decreased the size of spherulites. Comparing with the Nylon 10 T, the crystallization rate was increased with the addition of the sebacic acid comonomer.
文摘The Leibniz-Hopf algebra is the free associative Z - algebra with one generator in each positive degree and coproduct is given by the Cartan formula. It has been also known as the ＇ring ofnoncommutative symmetric functions＇ [1], and to be isomorphic to the Solomon Descent algebra [ 12]. This Hopf algebra has links with algebra,topology and combinatorics. In this article we consider another approach of proof for the antipode formula in the Leibniz-Hopf algebra by using some properties of words in [2].
文摘The Republic of Armenia, as a world superpower in chess, is engaged in continuous development and implementation of specific strategic programmes which are aimed not only at providing high achievements in chess, but also at： （1） modernizing the educational sphere in the Republic of Armenia; （2） increasing the quality indexes of chess education--as a basic resource in the context of global educational system; （3） considerably deepening education subjects＇ cognitive interests towards education through the possibilities provided by chess; （4） developing learners＇ educational-cognitive motivation; and （5） creating conditions for activating learners＇ mental potential and the abilities to expose them, as well as promoting the awareness of the social value of chess in interpersonal relations. The contextual factors of teaching and learning chess in primary schools of Republic of Armenia have been revealed and presented in this paper. A number of conclusions and recommendations for policy makers are considerably made based on analysis of big research data.
文摘During the Second World War, the Albanian communist leadership strengthened its political power by establishing close ties with the communist leadership of the Communist Party of Yugoslavia that was also the godfather in the creation of the Albanian Communist Party on November 8, 1941. The article will argue that the relationship of the Albanian Communist Party with other communist parties including the Yugoslav one and the management of the internal member＇s relations was motivated by the quest for power rather than the ideological motives. Hoxha was largely responsible for Albania＇s virtual isolation from the world. Little interest, understanding combined with negligence of the Western comprehension of the grip of Stalinism in Albania left the country to adhere Stalinism until the end of Communism in the 1990s.
基金Supported by National Natural Science Foundation of China (No.10672115)Specialized Research Fund for the Doctoral Program of Higher Education (No.20060056011) .
文摘This paper presents an analytical method for determining the steady state response of blade with dry friction damper. A complete vibration cycle is divided into four successive intervals. The system possesses linear vibration characteristic during each of these intervals, which can be determined by using analytical solution forms. An analytical solution of the system periodic motion can be formed by combining the four intervals’ solutions. Numerical simulation shows that there are two response peaks in passage through the resonant frequencies of the system without the friction damper and with the friction damper fully stuck respectively. The amplitude of the first peak can be reduced up to 90% by adjusting the value of normal pressure force between the damper’s contacting surfaces. Whereas to determine the optimum pressure force, reduction of amplitudes of two peaks should be considered together.
文摘Known data on the distribution of Alliocera graeca Saunders, 1845 and Ber＆ chalybata （Forster, 1771） in Europe are summarized. A. graeca has been reliable recorded from Albania, Croatia and Greece. B. chalybata has been reliable recorded from Austria, Belgium, Bulgaria, Czech Republic, Denmark, England, Finland, France, Germany, Hungary, Ireland, Italy, Netherlands, Norway, Poland, Roumania, Russia, Slovakia, Sweden, Switzeland. A. graeca and B. chalybata, known as European species, are new records for the Turkish Fauna. In this study, the female ofA. graeca and the female ofB. chalybata are presented and photographs of two species are accompanied. Distribution of these species treated is briefly discussed.
