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1.
For the first time Hlavatý represented the tensor*gv, defined by (15a), in terms of the unified field tensorg
in the space-timeX
4. Recently, the representations of*
g
v in terms ofg
in two- and three-dimensional generalized Riemannian space were obtained by Chung. The purpose of the present paper is to obtain the generalized representations of*
g
v in terms ofg
in a generalizedn-dimensional Riemannian spaceX
n. 相似文献
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在自由落体法测量重力加速度g中,需要测量物理下落过程中三点之间的距离△ s1和 s2,以及物体下落通过这三点所经历的时间间隔△ t1和 △t2 计算重力加速度g的公式为式中 △s1=s2-s1, △s2=s3-s2; △t1=t2-ti, △t2=t3- t2. △t1和 △t2可通过对标准振荡频率计数,并经频率/时间变换求得,而距离 △s1和s2可用激光相干涉测量.问题在于如何选择物体下落过程中的三个参考点.若以计时脉冲为准来定这三点,则最大测距误差可达±λ/2;若以相干波脉冲为准来定这三点,则最大测时误差可达±1/f.当然,也可以对尾数部分加以修正,但是设备复杂,… 相似文献
4.
CW Optical-Optical Double Resonance studies of the 23Πg, 33Πg, 43Πg+, and 13Δg Rydberg states of Na2
《Journal of Molecular Spectroscopy》1986,117(2):245-282
The 23Πg, 33Πg, 43Σg+, and 13Δg states of the Na2 molecule are observed by sub-Doppler Perturbation Facilitated Optical-Optical Double Resonance (PFOODR) spectroscopy. Absolute vibrational assignments and molecular constants are obtained for two of these states (33Πg, v = 0–25 observed, and 43Σg+, v = 3–5, 13, 14 observed). Tentative vibrational assignments and provisional molecular constants are obtained for the 23Πg (v = 43–89 observed) and 13Δg (v = 31–35, 40, 46–51 observed) states. Spin-orbit, spin-spin, and hyperfine splittings are observed. The direct 3Λg+ → a3Σu, 23Πg ∼ 33Πg perturbation-induced, and collision-induced contributions of these four 3Λg states to the ubiquitous Na-vapor violet and ultraviolet emission bands are discussed. 相似文献
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类比是人类认识事物的一种基本思维方法。它既不同于从一般推导到个别的演绎法,又不同于从个别推导到一般的归纳法,它是属于从特殊到特殊,从个别到个别的推理,在物理教学中占有极其重要的地位。本文通过对静电力和引力的类比,引入描述引力场的育关物理量以及高斯定理。 比较库仑定律和万有引力定律的数学表达式,发现它们具有惊人的相似之处:它们都服从平方反比定律,库仑定律中的q和万有引力定律中的m相当,库仑定律中的1/4πε和万有引力定律中的G相当,但它们也有各自的特殊性:万有引力总是引力,库仑力却可以是引力,也可以是斥力;还有库仑力存在于两带电体之间,而万有引力存在于任何两物体之间,我们可以将有关静电场的知识结构、研究方法移植于引力场中,如用场强研究力的性质,用势的概念研究场能的变化,用力线形象地描绘场,用高斯定理简便地计算空间各点的场强等。 类似于静电场,任何物体在其周围的空间激发了一个“引力场”,并对处在其中的任何物体有力的作用, 相似文献
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电子自旋共振中的g因子 总被引:1,自引:1,他引:0
凡具有未偶电子的物质,都可作为电子自旋共振的研究对象,将其置于恒定磁场(?)中时,会引起因电子自旋体系与外磁场相互作用所产生的塞曼(Zeeman)能级分裂,如果在垂直外磁场(?)方向上再加一频率为V的电磁辐射线偏振磁场(起作用的是它的右旋圆偏振分量),当满足hv=gμ_BB时,就会发生塞曼能级间的共振吸收(和辐射)现象,这就是电子顺磁共振(EPR)。理论和实验 相似文献
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John L. Spouge 《Journal of statistical physics》1983,31(2):363-378
This paper gives the equilibrium distribution of polymer sizes for Flory'sA
g
RB
f–g model of polymerization. In this model, the polymers are composed of structural units withg functional groups of the typeA and (f-g) functional groups of the typeB. Reaction is subject to three conditions: (1) Functional groups of the typeA react only with those of typeB, and vice versa. (2) Intramolecular reactions do not occur [and therefore only branched-chain (noncyclic) polymers and formed]. (3) Subject to conditions (1) and (2), all functional groups are equally reactive. The derivation employs Stockmayer's statistical mechanical method (first used on Flory'sRA
f model), coupled with a recursion giving the number of distinct polymers which may be assembled fromk units of theA
g
RB
f–g type. We also give distributions for a limiting case of theA
g
RB
f–g model, the so-calledA
g
RB
model. This paper completes the solution of the Smoluchowski coagulation equation (monodisperse case) for the kernelsa
ij =A + B(i +j)+ Cij. The proof will be given in another publication. 相似文献
9.
R. M. Lynden-Bell 《Molecular physics》2018,116(15-16):1915-1920
ABSTRACTSome examples of the use of molecular dynamics simulation to study solutions of small molecules in ionic liquids are discussed. It is shown that electrostatic forces, while not the dominant solute–solvent interaction, determine the local solute environment. The solubility of aromatics and the changes in the spectra of low-frequency intermolecular vibrations in two related ionic liquids (one dicationic and one monocationic) are compared with experimental results and related to the local environment. 相似文献
10.
周华彬 《原子与分子物理学报》2008,25(5)
采用强场方案和三角基,通过对角化三角畸变的立方晶场下的d3 完全能量矩阵,计算出了KAl(MoO4)2:Cr3+ 的能谱和波函数。使用对角化完全能量矩阵所获得的波函数,进一步计算了KAl(MoO4)2:Cr3+ 的基态g 因子。计算结果与光谱,EPR谱实验数据很好地符合。研究表明,利用对角化完全能量矩阵获得的波函数对 g 因子所作的计算为整个理论计算及波函数的归属提供了重要判据,充分体现了将能谱和g 因子作统一计算的重要性和必要性. 相似文献
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In the framework of the one-boson-exchange model, we have performed an extensive study of the possible B*B,B*B*,D*,D** molecular states with various quantum numbers after considering the S-wave and D-wave mixing. We also discuss the possible experimental research of these interesting states. 相似文献
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本文从能谱和跃迁几率诸方面讨论了振动核区的g玻色子自由度的问题,并给出了M1跃迁和E2跃迁的一些解析表达式.初步研究表明,探索振动核区的g玻色子自由度是有意义的. 相似文献
13.
重力加速度在物理教学中是一个重要的力学概念,但在中学教学中是逐步使学生加深认识的.初中是这样提出的:质量为1kg物体的重量是9.8N,因此g=9.8N/kg.这一等式暗示了g是重量和质量的比值,并没有明确g是一个什么物理量,当然也没有引出加速度这个概念.高中教材在直线运动的自由落体一节中才明确指出g是重力加速度.于是g就作为描述在落体运动中速度改变快慢的一个物理量而出现.由实验测出g值约为9.8m/s2.是矢量,方向始终竖直向下.这样g既具有一般加速度共性的一面,又有其个性一面.在牛顿第二定律之… 相似文献
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