There are several major technology standards, including audio video coding (AVS), automotive electronics, third generation(3G) mobile phones, mobile television, wireless networks and digital terrestrial television bro...There are several major technology standards, including audio video coding (AVS), automotive electronics, third generation(3G) mobile phones, mobile television, wireless networks and digital terrestrial television broadcasting, that have been released or are currently under development in China. This article offers a detailed analysis of each standard and studies their impact on China's high-technology industry.展开更多
Certificateless public key cryptography elimi- nates inherent key escrow problem in identity-based cryptog- raphy, and does not yet requires certificates as in the tradi- tional public key infrastructure. In this pape...Certificateless public key cryptography elimi- nates inherent key escrow problem in identity-based cryptog- raphy, and does not yet requires certificates as in the tradi- tional public key infrastructure. In this paper, we give crypt- analysis to Hwang et al.＇s certificateless encryption scheme which is the first concrete certificateless encryption scheme that can be proved to be secure against ＂malicious-but- passive＂ key generation center （KGC） attack in the stan- dard model. Their scheme is proved to be insecure even in a weaker security model called ＂honest-but-curious＂ KGC at- tack model. We then propose an improved scheme which is really secure against ＂malicious-but-passive＂ KGC attack in the standard model.展开更多
对B+注入的n on p平面结和分子束外延 (MBE)技术原位铟掺杂的n+ n p台面异质结的碲镉汞 (HgCdTe)长波光伏探测器暗电流进行了对比分析 .与n on p平面结器件相比 ,原位掺杂的n+ n p台面异质结器件得到较高的零偏动态阻抗 面积值 (R0 A) ...对B+注入的n on p平面结和分子束外延 (MBE)技术原位铟掺杂的n+ n p台面异质结的碲镉汞 (HgCdTe)长波光伏探测器暗电流进行了对比分析 .与n on p平面结器件相比 ,原位掺杂的n+ n p台面异质结器件得到较高的零偏动态阻抗 面积值 (R0 A) .通过与实验数据拟合 ,从理论上计算了这两种结构的器件在不同温度下的R0 A和在不同偏压下的暗电流 。展开更多
It is found that the natural chlorophyll can carry out hydrogenation reaction by the Ni cluster catalyst at normal temperature (10℃±2℃) and normal pressure in the dark. Along with the reaction going on, the fre...It is found that the natural chlorophyll can carry out hydrogenation reaction by the Ni cluster catalyst at normal temperature (10℃±2℃) and normal pressure in the dark. Along with the reaction going on, the fresh green color of chlorophyll fades gradually and become colorless in the end. Methods of Ultra violet spectrum, High effect liquid chromatogram, Gas chromatogram on line and X ray diffraction are employed to detect the reactants and the products. After reaction, the original chlorophyll A and chlorophyll B disappear; while some small molecules are found, such as CH 4, NH 3, KMgH 3. The reagents chlorophyll and hematoporphyrin are used as standerd references. The TEM image shows the catalyst particle size is within 3 nm～5 nm in the diameter. It is clear that after catalytic hydrogenation, both the porphyrin cycle and the pyrrole structure are broken. Perhaps the reaction imitates the natural decomposition of chlorophyll under reducing conditions (for example, under the deep sea) in nature. In the deep sea there are high pressure, small organic molecules, and very hot fluid with nm metal coming out of the bottom. From the view point of thermodynamics, it is possible to carry out a reverse reaction of the one mentioned above; and seen in this respective, life could have come from the sea. In fact, the porphyrin cycle is stable in natural environment in the Et OH solution of chlorophyll remained for one year, and in the Et OH solution of dead leaves. It can be found intact in both and it can still carry out similar catalytic reactions. Further experiments are conducted by using pyrrole and tetra hydrogen pyrrole as the reactants to carry out catalytic hydrogenation, and the results show that at normal temperature and pressure the pyrrole cycles are also broken and small molecule gases such as CH 4, C 3H 6, C 4H 10 , C 4H 8 are formed.展开更多
文摘There are several major technology standards, including audio video coding (AVS), automotive electronics, third generation(3G) mobile phones, mobile television, wireless networks and digital terrestrial television broadcasting, that have been released or are currently under development in China. This article offers a detailed analysis of each standard and studies their impact on China's high-technology industry.
文摘Certificateless public key cryptography elimi- nates inherent key escrow problem in identity-based cryptog- raphy, and does not yet requires certificates as in the tradi- tional public key infrastructure. In this paper, we give crypt- analysis to Hwang et al.＇s certificateless encryption scheme which is the first concrete certificateless encryption scheme that can be proved to be secure against ＂malicious-but- passive＂ key generation center （KGC） attack in the stan- dard model. Their scheme is proved to be insecure even in a weaker security model called ＂honest-but-curious＂ KGC at- tack model. We then propose an improved scheme which is really secure against ＂malicious-but-passive＂ KGC attack in the standard model.
文摘对B+注入的n on p平面结和分子束外延 (MBE)技术原位铟掺杂的n+ n p台面异质结的碲镉汞 (HgCdTe)长波光伏探测器暗电流进行了对比分析 .与n on p平面结器件相比 ,原位掺杂的n+ n p台面异质结器件得到较高的零偏动态阻抗 面积值 (R0 A) .通过与实验数据拟合 ,从理论上计算了这两种结构的器件在不同温度下的R0 A和在不同偏压下的暗电流 。
文摘It is found that the natural chlorophyll can carry out hydrogenation reaction by the Ni cluster catalyst at normal temperature (10℃±2℃) and normal pressure in the dark. Along with the reaction going on, the fresh green color of chlorophyll fades gradually and become colorless in the end. Methods of Ultra violet spectrum, High effect liquid chromatogram, Gas chromatogram on line and X ray diffraction are employed to detect the reactants and the products. After reaction, the original chlorophyll A and chlorophyll B disappear; while some small molecules are found, such as CH 4, NH 3, KMgH 3. The reagents chlorophyll and hematoporphyrin are used as standerd references. The TEM image shows the catalyst particle size is within 3 nm～5 nm in the diameter. It is clear that after catalytic hydrogenation, both the porphyrin cycle and the pyrrole structure are broken. Perhaps the reaction imitates the natural decomposition of chlorophyll under reducing conditions (for example, under the deep sea) in nature. In the deep sea there are high pressure, small organic molecules, and very hot fluid with nm metal coming out of the bottom. From the view point of thermodynamics, it is possible to carry out a reverse reaction of the one mentioned above; and seen in this respective, life could have come from the sea. In fact, the porphyrin cycle is stable in natural environment in the Et OH solution of chlorophyll remained for one year, and in the Et OH solution of dead leaves. It can be found intact in both and it can still carry out similar catalytic reactions. Further experiments are conducted by using pyrrole and tetra hydrogen pyrrole as the reactants to carry out catalytic hydrogenation, and the results show that at normal temperature and pressure the pyrrole cycles are also broken and small molecule gases such as CH 4, C 3H 6, C 4H 10 , C 4H 8 are formed.
