排序方式: 共有77条查询结果,搜索用时 15 毫秒
31.
Charge state distribution of 0.8MeV/u uranium ions after transmission through a thin carbon foil has been studied. It is observed that the charge state distribution is equilibrated after the uranium ions have passed through a 15μg/cm^2 carbon foil. The equilibrated average charge state is 33.72 and the charge equilibration time of uranium ions in carbon foil is less than 5.4fs. 相似文献
32.
Cytoskeleton is a network of filamentous proteins, such as actin filaments and microtubules. We propose a continuum cooperative hydrolysis model which possesses exactly analytical solution to describe the dynamics of filament.The results show that the cooperativity leads to non negative-exponential distribution of T(ATP or GTP) subunits.As an application, we investigate the treadmilling phenomenon using our model. It is shown that the cooperativity remarkably affects the length of filament. 相似文献
33.
Yu-Yu Jin Sheng-Xian Qin Hao Zu Lan Zhou Wei Zhong Yu-Bo Sheng 《Frontiers of Physics》2018,13(5):130321
Heralded noiseless amplification is beneficial in overcoming transmission photon loss in a noisy quantum channel. We propose a single-photon-assisted heralded noiseless amplification protocol of the singlephoton entanglement (SPE), where the single-photon qubit has an arbitrary unknown polarization feature. We focus on both the complete and partial photon loss during the transmission process. After the amplification, the parties can recover the pure less-entangled SPE into a maximally entangled SPE and increase its fidelity. Moreover, the polarization feature of the single-photon qubit will be well preserved and not be leaked. Our protocol can be realized under our current experimental condition. Based on the features above, our protocol may be useful in the quantum secure communication schemes that encode information in the polarization degree of freedom of photons. 相似文献
34.
研究了在铟锡氧化物(ITO)导电玻璃上组装的纳米钛酸锶薄膜光电极在模拟日光照射下对不锈钢的抗腐蚀保护性能.通过溶胶-凝胶法在添加和不添加十六烷基三甲基溴化铵(CTAB)表面活性剂的情况下制得了不同形貌的钛酸锶粉体.X射线衍射(XRD)和高分辨扫描电子显微镜(SEM)表征结呆表明,两种方法合成的钛酸锶均为钙钛矿型结构,但添加CTAB后得到的钛酸锶颗粒分散均匀,平均粒径为90 nm左右.采用紫外-可见漫反射光谱对钛酸锶薄膜的光物理性质进行了研究,发现其光吸收范围在紫外光区,而且通过CTAB协助合成的钛酸锶在小于380 nm光区较非CTAB协助合成的钛酸锶有更强的吸收.以0.1 mol·L-1NaOH+0.2 mol·L-1Na2S溶液为光电极反应的电解质,测试了钛酸锶薄膜电极对304不锈钢在0.5 mol·L-1的NaCI腐蚀溶液中的光电化学缓蚀性能.304不锈钢在CTAB改性钛酸锶薄膜光电化学保护或不保护条件在0.5 mol·L-1NaCl+0.05 mol·L-1HCl腐蚀溶液中腐蚀6h前后的表面金相图表明,钛酸锶薄膜具有优异的光电化学抗腐蚀性能. 相似文献
35.
The instability in the Dicke model with a rotating-wave approximation for finite N atoms is investigated in terms of the Berry phase and the fidelity. It can be identify by the discontinuity of these quantities as a function of the atom-field coupling parameter. Involving an additional field interaction, it is observed that the instability is not eliminated even for strong interaction of the bosonic fields, contrarily to the previous results limited to the minimal coupling regions. 相似文献
36.
Supercooling point (SCP) of female adults of Corythucha ciliata was significantly lower than that of male adults, with an average being -11.49 degrees C and -9.54 degrees C, respectively. Low temperature survival of adults of different ages indicated that there were differences in cold survival ability among age groups of adults. Nonlinear regression analysis found that the response of C. ciliata adults to exposure time under different low temperature regimes (above -5 degrees C) was best fitted by a logistic equation. Both low temperature and exposure time had significant effects on mortality of adults. Temperatures above 5 degrees C did not prevent C. ciliata adults from surviving. C. ciliata was shown to be a freeze-intolerant but chill-tolerant insect. C. ciliata could tolerate subzero temperatures by supercooling. Temperature around -8 degres C is a critical point for successful overwintering of C. ciliata adults, which can establish in the whole areas where Platanus trees are planted in China. 相似文献
37.
Journal of Mathematical Chemistry - A new EcoFinDif (Economical Finite Difference) method with eliminated phase-lag and its first derivative, for periodical and/or oscillating initial or boundary... 相似文献
38.
报道了在兰州重离子加速器国家实验室电子回旋共振离子源原子物理实验平台上,在室温(293.15K)条件下,用固定剂量(4.3×1011/cm2)的高电荷态40Ar12+离子,辐照沉积在厚度为300nm的金膜表面上、平均直径约为35.3nm的Au纳米颗粒,使其大小发生改变的实验结果.实验中,通过改变入射离子的引出电压,选择不同的能量,利用原子力显微镜(AFM)对辐照前后颗粒的形态和大小进行表征,系统地研究了辐照后Au纳米颗
关键词:
纳米颗粒
高电荷态离子
离子辐照
临界能量 相似文献
39.
40.