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介绍了合肥光源同步光测量系统,包括条纹相机系统、快速光电测量束团长度系统、束团横向截面测量系统和光位置测量系统.利用条纹相机系统和快速光电测量柬团长度系统进行了束团长度测量和束团伸长效应的研究.利用束流截面测量系统进行了六极铁对横向不稳定性抑制效果和横向反馈系统反馈效果的测量研究.光位置测量系统采用丝型光位置检测器和自行研制了对数处理?用于测量光源点的束流位置和角度. 相似文献
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《物理学报》2021,(11)
量子密度矩阵描述了量子态的性质,因此如何有效地测量密度矩阵是量子力学的核心课题之一.最近,几个研究组发展了一种基于弱值的直接测量密度矩阵的方法.相较于常用的量子态层析技术,这种方法能够更直接和更简便地重构密度矩阵.然而这种方法需要耦合额外的测量指针,从而也增加了测量的复杂度和测量系统的设计困难.本文先回顾并讨论了量子态直接测量的相关研究,然后基于δ-淬火直接测量波函数的方法提出了一种新的直接测量密度矩阵的方法.这种方法无需耦合外部测量指针,因此可以降低测量的复杂度和测量系统的设计困难,更进一步地简化了直接测量密度矩阵的实验过程.基于此方法,提出了更高信号强度以及更少操作次数等两种无指针直接测量方案,并对比分析了它们在不同的测量条件下的优缺点.最后,具体设计了测量光子密度矩阵的实验. 相似文献
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在庞加莱球的基础上,对原偏振模色散的测量方法进行了理论分析.研究表明,原方法属于间接测量,在测量二阶偏振模色散中存在明显不足.一阶偏振模色散测量的误差影响二阶偏振模色散的测量,间接测量降低了二阶偏振模色散的测量准确度.提出了一种二阶偏振模色散测量的新方法,保证了测量准确度,并通过实验中的统计结果得到证实. 相似文献
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为了提高LED光源色温和亮度的调节精度和准确度,结合色温由低向高变化时光色所呈现的渐变特点,提出了一种低色温白光LED灯珠、高色温白光LED灯珠加红绿蓝光LED灯珠补偿式调光的方法.将色温分成三个部分进行调节,每个部分选用不同的LED灯珠组合来进行调光.实验结果表明:不同组合情况下的LED光源的初始输出色温相对于目标值的偏差范围在1%以内;亮度可以在保证色温不变的情况下独立进行调节,初始输出值与目标值的偏差范围在1%以内;经过微调之后可以达到目标值;达到了色温和亮度独立调节的要求;光源发光稳定,不会因为长时间工作而影响调节精度. 相似文献
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A technique combining image processing and laser interferometry for visualizing and detecting the deformation of transparent cylindrical and spherical sample is proposed. This deformation includes geometric deformation such as volume transition in profilometry and physical deformation such as refractive index change in tomography. Phase contour lines are used for quantitative analysis and graphical representation of the deformation. This method allows us to visually detect the spatial variation of the deformation field and to evaluate the test quality such as misalignment of optical system. A theoretical analysis using phase contour map to characterize the deformation field is described in detail. A method using phase contour map to qualify the interferometric test is proposed. Analysis of test examples is carried out. Suggestions on using phase contour line method to ameliorate test system design are finally discussed. 相似文献
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We show that good approximations to the exact equivalent local potential (ELP) and damping factor of a nonlocal Perey-Buck potential can be calculated in the partial wave WKB approximation of Horiuchi. The exact ELP and damping factor are obtained by means of a method previously given by one of us. We also confirm that an approximate ELP proposed by Bauhoff et al. is of comparable accuracy as the Horiuchi approximation. Thesel-dependent ELP's exhibit reduced attraction in the interior and provide a test for higher order WKB approximations. We subsequently obtain an equivalent velocity dependent potential (EVDP) which is even exactly wave function equivalent to the original nonlocal potential. This almost local potential, unlike the trivial equivalent local potential, is smooth and well-behaved and is therefore particularly useful in nuclear reactions where the off-shell behaviour of the potential is important. 相似文献
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Mario Rabinowitz 《International Journal of Theoretical Physics》2009,48(3):706-722
Discrepancies and accords between quantum (QM) and classical mechanics (CM) related to expectation values and periods are
generally found for both the harmonic oscillator (SHO) and a free particle in a box (FPB), which may apply generally. These
indicate non-locality is expected throughout QM. The FPB energy states violate the Correspondence Principle. Previously unexpected
accords are found and proven that 〈x
2〉
CM
=〈x
2〉
QM
and τ
CM
=τ
QMb
(beat period i.e. beats between the phases for adjoining energy states) for the SHO for all quantum numbers, n. However, for the FPB the beat periods differ at small n. It is shown that a particle’s velocity in an infinite square well varies, no matter how wide the box, nor how far the particle
is from the walls. The quantum free particle variances share an indirect commonality with the Aharonov-Bohm and Aharonov-Casher
effects in that there is a quantum action in the absence of a force. The concept of an “Expectation Value over a Partial Well
Width” is introduced. This paper raises the question as to whether these inconsistencies are undetectable, or can be empirically
ascertained. These inherent variances may need to be fixed, or nature is manifestly more non-classical than expected. 相似文献
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The relative stability of alternative carbon nanoparticles with icosahedral symmetry, such as diamond-like nanocrystallites and multiwalled fullerenes (onions), is investigated using the parametric model and the density functional tight-binding (DFTB) method. It is demonstrated that an increase in the size of particles and their hydrogenation favor the stabilization of diamond-like nanocrystallites. The formation of “intermediate” nanostructures consisting of diamond-like nanocrystallites inside the fullerene cage is revealed. The electronic spectra of icosahedral carbon nanoparticles are calculated. 相似文献
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Stanford Goldman 《Foundations of Physics》1982,12(9):907-917
This is a further development of the author's paper A Unified Theory of Biology and Physics. It is found that male and female in biology, as well as particle and antiparticle in physics, are analogues of symmetrical sideband pairs in communication theory. This gives a new point of view from which to investigate the significance and characteristics of these different paired entities.These findings are intimately related to the fact that there are two transform domains of representation of entities in all the cases involved. They are the somatic and the genetic domains in biology, the configuration domain and the domain of conserved observables in physics, and the time and frequency domains in communication. 相似文献