Mr. Chairman, Distinguished Members of the Committee, First of all, I would like to extend, on behalf of the Chinese delegation, our greetings and respects to all the distinguished members of the Committee. The Commit...Mr. Chairman, Distinguished Members of the Committee, First of all, I would like to extend, on behalf of the Chinese delegation, our greetings and respects to all the distinguished members of the Committee. The Committee has made enormous efforts and played an important role in promoting the purposes and principles of the Convention and reinforcing the global efforts to ban and prevent torture. The Chinese Government appreciates your endeavor and will continue to support the work of the Committee.展开更多
Alloys with composition of Mg_(96-x)Gd_3Zn_1Li_x(at.%)(x=0, 2, 4, and 6) were prepared by conventional casting. The microstructures of these alloys under as-cast and solid-solution conditions have been observed, and t...Alloys with composition of Mg_(96-x)Gd_3Zn_1Li_x(at.%)(x=0, 2, 4, and 6) were prepared by conventional casting. The microstructures of these alloys under as-cast and solid-solution conditions have been observed, and the mechanical properties were investigated. The results showed that Li is an effective element to refine the grains and break the eutectic networks in as-cast MgGd_3Zn_1 alloy. During solid solution treatment, these broken eutectic networks are spheroidized and highly dispersed. In addition, plentiful lamellar long period stacking ordered(LPSO) phases are precipitated in an α-Mg matrix when the Li addition is not more than 4%. Solid-solution treated Mg_(92)Gd_3Zn_1Li_4 alloy exhibits an optimal ultimate tensile strength(UTS) of 226 MPa and elongation of 5.8%. The strength of MgGd_3Zn_1 alloy is improved significantly, meanwhile, the toughness is apparently increased.展开更多
In this paper, a Liénard equation with a deviating argument has been studied by means of Mawhin’s continuation theorem. A new result guaranteeing the existence of periodic solutions is obtained.
Some trends in foreign NDT,Ma Minggang,Non Destructive Testing,11(1989 ),No.2,41.Ultrasonic thickness gauge and its tendency,Zhang Qingxi,Non destructive Testing,11 (1989 ),No.7,187.Analysis of acoustical Properties o...Some trends in foreign NDT,Ma Minggang,Non Destructive Testing,11(1989 ),No.2,41.Ultrasonic thickness gauge and its tendency,Zhang Qingxi,Non destructive Testing,11 (1989 ),No.7,187.Analysis of acoustical Properties of listening rooms,Zhu Feng.Audio Engineering,1989,No.1,6Exploration on popularization and application of AM stereo technique in the field of medium-wave broadcasting inChina,Zhang dumin,Audio Engineering,1989,No.3,33.On the development of mode experiment and its analysis(3),Zhang Lingmi,Journal of Vibration and shock,8 (1989),No.1,52.A review of ship vibration research in China(1 ),Guo rixiu,Suo Zhiqiang,Journal of Vibration and shock,8 (1989 ),No.161.展开更多
文摘Mr. Chairman, Distinguished Members of the Committee, First of all, I would like to extend, on behalf of the Chinese delegation, our greetings and respects to all the distinguished members of the Committee. The Committee has made enormous efforts and played an important role in promoting the purposes and principles of the Convention and reinforcing the global efforts to ban and prevent torture. The Chinese Government appreciates your endeavor and will continue to support the work of the Committee.
基金supported by the National Natural Science Foundation of China(Nos.50571073,51574175 and 51474153)the Ph. D. Programs Foundation of Ministry of Education of China(20111402110004)the Natural Science Foundation of Shanxi Province(Nos.2009011028-3 and 2012011022-1)
文摘Alloys with composition of Mg_(96-x)Gd_3Zn_1Li_x(at.%)(x=0, 2, 4, and 6) were prepared by conventional casting. The microstructures of these alloys under as-cast and solid-solution conditions have been observed, and the mechanical properties were investigated. The results showed that Li is an effective element to refine the grains and break the eutectic networks in as-cast MgGd_3Zn_1 alloy. During solid solution treatment, these broken eutectic networks are spheroidized and highly dispersed. In addition, plentiful lamellar long period stacking ordered(LPSO) phases are precipitated in an α-Mg matrix when the Li addition is not more than 4%. Solid-solution treated Mg_(92)Gd_3Zn_1Li_4 alloy exhibits an optimal ultimate tensile strength(UTS) of 226 MPa and elongation of 5.8%. The strength of MgGd_3Zn_1 alloy is improved significantly, meanwhile, the toughness is apparently increased.
基金supported by NSF of the Educational Bureau of Anhui Province(No.KJ2009B103Z, 2009SQRZ083, KJ2008B235)the Key Young Item of Anhui University of Finance and Economics (No.ACKYQ0811ZD)
文摘In this paper, a Liénard equation with a deviating argument has been studied by means of Mawhin’s continuation theorem. A new result guaranteeing the existence of periodic solutions is obtained.
文摘Some trends in foreign NDT,Ma Minggang,Non Destructive Testing,11(1989 ),No.2,41.Ultrasonic thickness gauge and its tendency,Zhang Qingxi,Non destructive Testing,11 (1989 ),No.7,187.Analysis of acoustical Properties of listening rooms,Zhu Feng.Audio Engineering,1989,No.1,6Exploration on popularization and application of AM stereo technique in the field of medium-wave broadcasting inChina,Zhang dumin,Audio Engineering,1989,No.3,33.On the development of mode experiment and its analysis(3),Zhang Lingmi,Journal of Vibration and shock,8 (1989),No.1,52.A review of ship vibration research in China(1 ),Guo rixiu,Suo Zhiqiang,Journal of Vibration and shock,8 (1989 ),No.161.
