The 12th Sino-German Human Rights Symposium opened today in Beijing. On behalf of the State Council Information Office, I would like to express my warmest con- gratulations on the opening of the forum, extend my welco...The 12th Sino-German Human Rights Symposium opened today in Beijing. On behalf of the State Council Information Office, I would like to express my warmest con- gratulations on the opening of the forum, extend my welcome to Ms. Herta Daeubler-Gmelin and other German friends and my gratitude to symposium organizers and all participants for your long-term contribution to communication and exchange in human rights between China and Germany.展开更多
With the in-depth development of China’s market economy,animal husbandry has become an important industry that affects China’s economic form.In order to effectively promote the healthy development of animal husbandr...With the in-depth development of China’s market economy,animal husbandry has become an important industry that affects China’s economic form.In order to effectively promote the healthy development of animal husbandry,attention should be paid to the prevention of animal diseases.This paper made a detailed analysis from the main problems encountered in the process of animal epidemic prevention work as an entry point,and put forward some effective measures for strengthening animal epidemic prevention work.展开更多
The hardness measurement,optical microscopy （OM）,and transmission electron microscopy （TEM） microstructure observation on the annealing behaviors of Cu-Al2O3 （2.25 vol.% and 0.54 vol.% Al2O3） and Cu-0.52vol.%Nb ...The hardness measurement,optical microscopy （OM）,and transmission electron microscopy （TEM） microstructure observation on the annealing behaviors of Cu-Al2O3 （2.25 vol.% and 0.54 vol.% Al2O3） and Cu-0.52vol.%Nb alloys were carried out. The results show that with the increase of annealing temperature,the hardness of Cu-Al2O3 alloys decreases slowly. No change of the fiber structure formed by cold rolling in the Cu-2.25vol.%Al2O3 alloy is observed even after annealing at 900℃and the higher dislocation density can still be observed by TEM. Less combination of fiber formed by cold rolling and subgrains are observed in the Cu-0.54vol.%Al2O3 alloy annealed at 900℃. With the increase of annealing temperature,the hardness of the Cu-0.52vol.%Nb alloy exhibits a general decreasing trend,and its falling rate is higher than that of the Cu-Al2O3 alloys,indicating that its ability of resistance to softening at elevated temperature is weaker than that of the Cu-Al2O3 alloys. However,when annealed at a temperature of 300-400℃,probably owing to the precipitation strengthening of niobium,the hardness of the Cu-0.52vol.%Nb alloy arises slightly. The fibers formed by cold rolling be-come un-clear and un-straight and have less combination,and considerably more subgrains are observed by TEM.展开更多
To clarify the work hardening discrepancy effect on the strengthening of laminated metals,we designed two laminated Cu/Cu4Zn and Cu/Cu32Zn samples with different layer thicknesses.Cu/Cu4Zn has larger work hardening di...To clarify the work hardening discrepancy effect on the strengthening of laminated metals,we designed two laminated Cu/Cu4Zn and Cu/Cu32Zn samples with different layer thicknesses.Cu/Cu4Zn has larger work hardening discrepancy between two constituent layers relative to Cu/Cu32Zn,but the yield strengths of two Cu Zn constituents are comparable.Uniaxial tensile results suggest Cu/Cu4Zn with larger work hardening discrepancy exhibits a significant strengthening at early deformation stage while Cu/Cu32Zn possesses a better ductility.The underlying mechanisms for the strengthening effect are attributed to more geometrically necessary dislocations accumulated at interfaces and severer strain localization due to the larger work hardening discrepancy.展开更多
文摘The 12th Sino-German Human Rights Symposium opened today in Beijing. On behalf of the State Council Information Office, I would like to express my warmest con- gratulations on the opening of the forum, extend my welcome to Ms. Herta Daeubler-Gmelin and other German friends and my gratitude to symposium organizers and all participants for your long-term contribution to communication and exchange in human rights between China and Germany.
文摘With the in-depth development of China’s market economy,animal husbandry has become an important industry that affects China’s economic form.In order to effectively promote the healthy development of animal husbandry,attention should be paid to the prevention of animal diseases.This paper made a detailed analysis from the main problems encountered in the process of animal epidemic prevention work as an entry point,and put forward some effective measures for strengthening animal epidemic prevention work.
文摘The hardness measurement,optical microscopy （OM）,and transmission electron microscopy （TEM） microstructure observation on the annealing behaviors of Cu-Al2O3 （2.25 vol.% and 0.54 vol.% Al2O3） and Cu-0.52vol.%Nb alloys were carried out. The results show that with the increase of annealing temperature,the hardness of Cu-Al2O3 alloys decreases slowly. No change of the fiber structure formed by cold rolling in the Cu-2.25vol.%Al2O3 alloy is observed even after annealing at 900℃and the higher dislocation density can still be observed by TEM. Less combination of fiber formed by cold rolling and subgrains are observed in the Cu-0.54vol.%Al2O3 alloy annealed at 900℃. With the increase of annealing temperature,the hardness of the Cu-0.52vol.%Nb alloy exhibits a general decreasing trend,and its falling rate is higher than that of the Cu-Al2O3 alloys,indicating that its ability of resistance to softening at elevated temperature is weaker than that of the Cu-Al2O3 alloys. However,when annealed at a temperature of 300-400℃,probably owing to the precipitation strengthening of niobium,the hardness of the Cu-0.52vol.%Nb alloy arises slightly. The fibers formed by cold rolling be-come un-clear and un-straight and have less combination,and considerably more subgrains are observed by TEM.
基金financial support by the National Natural Science Foundation of China(Nos.U1608257 and 51931010)the Key Research Program of Frontier Science and International Partnership Program(No.GJHZ2029)+3 种基金CAS,Liao Ning Revitalization Talents Program(No.XLYC1802026)financial support by the National Natural Science Foundatiosn of China(No.52001312)the Project Funded by China Postdoctoral Science Foundation(Nos.BX20190336 and 2019M661150)the Open Research Fund from the State Key Laboratory of Rolling and Automation,Northeastern University(No.2018RALKFKT002)。
文摘To clarify the work hardening discrepancy effect on the strengthening of laminated metals,we designed two laminated Cu/Cu4Zn and Cu/Cu32Zn samples with different layer thicknesses.Cu/Cu4Zn has larger work hardening discrepancy between two constituent layers relative to Cu/Cu32Zn,but the yield strengths of two Cu Zn constituents are comparable.Uniaxial tensile results suggest Cu/Cu4Zn with larger work hardening discrepancy exhibits a significant strengthening at early deformation stage while Cu/Cu32Zn possesses a better ductility.The underlying mechanisms for the strengthening effect are attributed to more geometrically necessary dislocations accumulated at interfaces and severer strain localization due to the larger work hardening discrepancy.
