排序方式: 共有61条查询结果,搜索用时 15 毫秒
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利用吸附法原位制备CuO/SiO2、CuO-Ag/SiO2纳米复合物,研究了不同吸附质体系中预负载的纳米Ag粒子对CuO的影响。结果表明:Ag粒子对CuO的影响因吸附质的不同而不同。以Cu(Ac)2为吸附质,纳米Ag几乎没有影响;以NaOH为吸附质,纳米Ag使得CuO的晶粒粒径增大。这一结果与铜物种对Ag晶粒粒径的影响规律完全不同。通过比较不同吸附质的吸附行为,Cu(OH)2与硅胶表面的相互作用被认为是导致这一现象的原因。 相似文献
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在中国原子能科学研究院重水研究堆上用活化法对反应堆中子引起的181Hf (n,γ)182Hf反应截面进行了测量. 反应堆中样品照射位置的热中子与超热中子的通量比值约为10. 照射后样品中的182Hf/180Hf和 181Hf/180Hf的原子数比值是用热电离质谱测量的. 本工作以180Hf (n,γ)181Hf反应截面(14.80±0.60 b)为标准,测得的反应堆中子引起的181Hf (n,γ)182Hf反应截面值为80.0±5.6 b. 相似文献
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一种新尾式卟啉吡啶季铵盐对锌离子显色反应的研究 总被引:1,自引:0,他引:1
本文研究了一种新型尾式卟啉吡啶季铵盐5-[4-(4-吡啶丁氧基)苯基]-10,15,20-三(4-氯苯基)卟啉溴化物与锌的反应条件。pH=10.0,在吡啶存在下,于沸水浴中加热15min,其与Zn2+形成1∶1配合物,其最大吸收波长位于428.6nm,在此条件下试剂的最大吸收波长在418.2nm,相差10nm,配合物摩尔吸光系数4.64×105L·mol-1·cm-1,锌在0—1.2μg/10mL范围内符合比耳定律,相关系数r=0.9888,本法是目前报道的分光光度法测定锌的最灵敏方法之一。 相似文献
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We couple a ladder-type three-level superconducting artificial atom to a cavity. Adjusting the artificial atom to make the cavity be resonant with the two upper levels, we then probe the lower two levels of the artificial atom. When driving the cavity to a coherent state, the probe spectrum shows energy level splitting induced by the quantized electromagnetic field in the cavity. This splitting size is related to the coupling strength between the cavity and the artificial atom and, thus, is fixed after the sample is fabricated. This is in contrast to the classical Autler–Townes splitting of a three-level system in which the splitting is proportional to the driving amplitude, which can be continuously changed. Our experiment results show the difference between the classical microwave driving field and the quantum field of the cavity. 相似文献
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Measurements of three-junction flux qubits, both single flux qubits and coupled flux qubits, using a coupled direct current superconducting quantum interference device (dc-SQUID) for readout are reported. The measurement procedure is described in detail. We performed spectroscopy measurements and coherent manipulations of the qubit states on a single flux qubit, demonstrating quantum energy levels and Rabi oscillations, with Rabi oscillation decay time TRabi =- 78 ns and energy relaxation time T~ = 315 ns. We found that the value of TRabi depends strongly on the mutual inductance between the qubit and the magnetic coil. We also performed spectroscopy measurements on inductively coupled flux qubits. 相似文献
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