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ZIFs纳米晶体中电子偶素的自旋转换
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作者 李重阳 李梦德 +4 位作者 汪美 李涛 刘建党 叶邦角 陈志权 《物理学报》 SCIE EI CAS CSCD 北大核心 2022年第15期257-264,共8页
ZIFs晶体由咪唑基桥接单金属离子构成,可通过咪唑酯连接物灵活选取合适的官能团对其结构进行调控,因而被赋予更多新的性质和功能.ZIFs晶体中孔结构及其化学环境与其性能紧密相关.本文采用静置法制备了ZIFs纳米晶体.X射线衍射结果证实制... ZIFs晶体由咪唑基桥接单金属离子构成,可通过咪唑酯连接物灵活选取合适的官能团对其结构进行调控,因而被赋予更多新的性质和功能.ZIFs晶体中孔结构及其化学环境与其性能紧密相关.本文采用静置法制备了ZIFs纳米晶体.X射线衍射结果证实制备的晶体为典型的ZIF-8晶体,扫描电子显微镜图可观察到其规则的菱型结构.N_(2)吸附-脱附测试表明ZIFs晶体具有较大的比表面积和孔容,分别为2966.26 m^(2)/g和3.01 cm^(3)/g.随着Co摩尔含量的增大,ZIFs晶体比表面积和孔体积逐渐减小,但是其孔径大小几乎稳定保持在12?左右.而N_(2)吸附-脱附等温线计算得到的孔径分布未显示咪唑配体组成的六元环的超微孔信息(3.4?).此外,利用正电子湮没寿命和多普勒展宽对晶体的微观结构和表面性能进行了研究.正电子的寿命谱有4个分量.较长寿命τ3,τ4分别是o-Ps在其微孔区域和晶体规则棱角间隙处的湮没寿命.随Co摩尔含量增大,其寿命τ3几乎没有变化,而较长寿命τ4从30.89 ns降至12.57 ns,其对应强度I3,I4也分别从12.93%和8.15%急剧下降至3.68%和0.54%.随Co摩尔含量的增大,多普勒展宽得到的S参数呈连续上升趋势,进一步多高斯拟合表明p-Ps强度也逐渐增大,这主要是由于电子偶素发生了自旋转换效应.因此,ZIFs纳米晶体中τ4下降很可能是由于正电子偶素与晶体表面Co离子发生了自旋转换效应. 展开更多
关键词 正电子湮没寿命 电子偶素 多普勒展宽 自旋转换
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Realization of the Three-Qubit Toffoli Gate in Molecules
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作者 DU Jiang-Feng SHI Ming-Jun +5 位作者 ZHOU Xian-Yi FAN Yang-Mei WU Ji-Hui ye bang-jiao WENG Hui-Min HAN Rong-Dian 《Chinese Physics Letters》 SCIE CAS CSCD 2000年第12期859-861,共3页
We present the experimental realization of this gate with a solution of chlorostyrene molecules. Our method does not depend heavily on the two-qubit controlled operation, which used to serve as the basic quantum opera... We present the experimental realization of this gate with a solution of chlorostyrene molecules. Our method does not depend heavily on the two-qubit controlled operation, which used to serve as the basic quantum operation in quantum computing. At present, we use transition operator that can be applied to all qubits in one operation. It appears that no experimental realization has yet been reported up to now regarding the implementation of quantum Toffoli gate using transition pulse on three-qubit nuclear magnetic resonance quantum computers. In addition, our method is experimentally convenient to be extended to more qubits. 展开更多
关键词 QUANTUM REALIZATION TRANSITION
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Implementation of Quantum Logic Gates by Nuclear Magnetic Resonance Spectroscopy
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作者 DU Jiang-Feng WU Ji-Hui +5 位作者 SHI Ming-Jun HAN Liang ZHOU Xian-Yi ye bang-jiao WENG Hui-Ming HAN Rong-Dian 《Chinese Physics Letters》 SCIE CAS CSCD 2000年第1期64-66,共3页
Using nuciear magnetic resonance techniques with a solution of cytosine molecules,we show an implementation of certain quantum logic gates(including NOT gate,square-root of NOT gate and controlled~NOT gate),which have... Using nuciear magnetic resonance techniques with a solution of cytosine molecules,we show an implementation of certain quantum logic gates(including NOT gate,square-root of NOT gate and controlled~NOT gate),which have central importance in quantum computing.In addition,experimental results show that nuclear magnetic resonance spectroscopy can efHciently measure the resuit of quantum computing without attendant wave-function collapse. 展开更多
关键词 QUANTUM ADDITION RESONANCE
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Reduced Sputtering Yields Induced by Fast Neutrons
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作者 ye bang-jiao FAN Yang-mei +3 位作者 Yoshimi KASUGAI Yujiro IKEDA ZHOU Xian-yi HAN Rong-dian 《Chinese Physics Letters》 SCIE CAS CSCD 1999年第11期844-846,共3页
The reduced sputtering yield (y_(n)^(R)) of materials induced by fast neutron is presented. Based on the experimental (y_(n)^(R)) results for (n, 2n), (n, p), (n, α) and (n, np) reactions, the value of (y_(n)^(R)) fo... The reduced sputtering yield (y_(n)^(R)) of materials induced by fast neutron is presented. Based on the experimental (y_(n)^(R)) results for (n, 2n), (n, p), (n, α) and (n, np) reactions, the value of (y_(n)^(R)) for (n, non-elastic) reaction is deduced by using data of cross sections in JENDL-3.2 and ENDF/B-VI. The value of (y_(n)^(R)) for (n, n) reaction is predicted by relation between (y_(n)^(R)) and the mean projected ranges of recoil nuclides. Combining both (y_(n)^(R)) for (n, n) and (n, non-elastic) reactions, the total (y_(n)^(R)) is obtained. Systematics of (y_(n)^(R)) for (n, non-elastic), (n, n) and (n, total) reactions have been demonstrated. 展开更多
关键词 VALUE deduced projected
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缪子成像及元素成分分析 被引量:5
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作者 叶邦角 李样 周志浩 《物理》 CAS 北大核心 2021年第4期248-256,共9页
缪子为轻子的一种,主要来源于宇宙射线和加速器。宇宙射线缪子能量高、穿透性强,是一种天然的非破坏性基本粒子“探针”,可以对物体进行成像和无损检测。加速器缪子强度高、能量可调,可以对物体快速成像。加速器产生的负缪粒子进入材料... 缪子为轻子的一种,主要来源于宇宙射线和加速器。宇宙射线缪子能量高、穿透性强,是一种天然的非破坏性基本粒子“探针”,可以对物体进行成像和无损检测。加速器缪子强度高、能量可调,可以对物体快速成像。加速器产生的负缪粒子进入材料会形成缪子原子,级联跃迁产生的X射线可以对材料进行元素分析。文章介绍了宇宙射线缪子成像、加速器缪子成像和缪子原子X射线元素分析三种技术的基本原理、成像手段或分析方法,以及其主要应用、发展现状与趋势,特别介绍了中国散裂中子源在加速器缪子成像和缪子原子X射线应用研究的规划。 展开更多
关键词 宇宙射线缪子 加速器缪子 缪子成像 X射线元素分析
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