细胞生物力学

文章评述了组成细胞的各种材料与亚结构的力学特性，细胞及其分子所产生的力和细胞对力作用的响应，介绍了描述细胞形态结构与力学行为的本构方程和研究细胞力学的有关实验技术．内容不仅包括有关细胞生物力学各种主要及最新的研究成果，而且还包括作者对细胞力学的有关实验与理论研究结果，还有许多可供从事生命科学研究人员研究参考的有关细胞生物力学详实而又系统的资料和数据．     

基于阿特伍德机的连接体实验

借助阿特伍德机研究连接体有关问题,得到加速度的实验误差与连接体质量的关系并对加速度进行了修正,找到了有关滑轮连结体实验的最佳条件,进而推广到大学物理所有涉及连接体实验的最佳条件.     

一种改变大家认知的ED型变压器实验现象

通过实验探究,研究"ED型"变压器磁路中的磁通分布,并解释相关现象,阐述了"ED型"变压器的磁通分布不仅与磁路有关,而且与两个输出端外接电路有关.     

大爆炸声学:早期宇宙中的声

大爆炸是研究宇宙起源的现代科学命题之一。不可想象的是,直到最近,除了题目外,研究尚缺少任何有关声学的内容。大爆炸是1950年由Fred Hoyle命名的,他开始时的研究也与声波无关,仅与宇宙早期膨胀的"爆炸"特性有关。现在几十年过去了,关于宇宙起源的许多其它特性得到了广泛的研究,甚     

小孔持续周期性泄流的实验与观测

对小孔周期性泄流实验进行了研究,发现小孔周期性泄流的形成除了与实验装置内外筒液体的浓度、黏度和相容性有关外,还与内外筒之间的空隙有关;周期的大小不但与内外筒液体的浓度、小孔孔径有关,还与内外筒的直径有关.     

Rijke-ZT型脉动燃烧器的频率特性研究

对基于Higgins-Rijke热声现象的Rijke-ZT型无阀自激脉动燃烧器计及工质温度分布的频率特性进行了实验研究,推导了计算频率的公式。研究表明,这种类型的脉动燃烧器的频率不仅与燃烧器的形状和尺寸有关,而且与燃烧器内热气体温度分布有关。     

掺钛氧化锌纳米薄膜的研究进展

在论述磁控溅射制备的掺钛氧化锌薄膜研究意义的基础上,介绍了目前国内外有关采用磁控溅射制备的掺钛氧化锌薄膜的研究现状,并展望了掺钛氧化锌薄膜的未来研究方向。     

一种阻尼振动规律的研究

以弹簧振子运动为基础,借助MathCAD软件对有关阻尼振动进行了分析与研究.     

有限体系能量耗散运动的功率谱分析

研究了有限的多自由度耦合哈密顿系统能量耗散过程的动力学问题. 通过数值模拟，实现有关自由度的能量耗散过程，采用功率谱方法研究有关系统运动中的坐标q(t)或动量p(t)的演化过程. 结果发现：在有关系统的能量耗散过程中，有关自由度运动的频率成分向高频和低频方向都有明显展宽，随着无关系统自由度增多，展宽明显增加；低频成分比较稳定，高频成分随着时间的演变逐渐减少. 关键词： 有限系统 能量耗散 有关自由度 功率谱     

有源介观LC电路的量子涨落

本文利用含时微扰论,研究了电源幅值较小时介观LC电路中电荷与电流的量子涨落。在确定的温度下,系统将处在混合态,进一步得到有限温度下含源介观LC电路的量子涨落。研究表明有源介观LC电路的量子涨落不仅与电路参数有关,还与时间和温度有关。     

Production and decay of the Standard Model Higgs boson at LEP200

We collect and update theoretical predictions for the production rate and decay branching fractions of the Standard Model Higgs boson that will be relevant for the Higgs search at LEP200. We make full use of the present knowledge of radiative corrections. We estimate the systematics arising from theoretical and experimental uncertainties.     

Effects of combined harmonic and random excitations on a Brusselator model

We discuss the constructive role of combined harmonic and random excitation on stochastic resonance (SR) in a Brusselator model. We first numerically investigate SR determined by the Signal-to-Noise Ratio (SNR) in this model. Effects of different parameters on SR are described in detail. Our simulation results show that the intensity of the Gaussian colored noise and the amplitude of the periodic force can enhance SR. Moreover, an analytical framework is presented for the SNR of the Brusselator model, leading to a theoretical expression of SNR. We observe a good agreement between the theoretical and numerical results, and the effectiveness of the proposed theoretical method is verified. This theoretical analysis provides a global view on how the dynamics of a periodically forced system with noise changes in the vicinity of a Hopf bifurcation.     

Image formation in structured illumination wide-field fluorescence microscopy

We present a theoretical analysis of the image formation in structured illumination wide-field fluorescence microscopy (SIWFFM). We show that the optically sectioned images obtained with this approach possess the optical sectioning strengths comparable to those obtained with the confocal microscope. We further show that the transfer function behaviour is directly comparable to that of the true confocal instrument. The theoretical considerations are compared with and confirmed by experimental results.     

On the complex energy eigenvalue theory of alpha decay

We have developed a method to compute alpha decay widths in the theoretical frame of the complex energy eigenvalue. We apply it to 102 alpha decays of even-even nuclei. The theoretical values reproduce reasonably well the experimental results and they also show that there is a structure which depends on the orbital angular momentum of decay.     

Left–right asymmetry in semi-inclusive deep inelastic scattering process

We analyze the left–right asymmetry of pion production in semi-inclusive deep inelastic scattering (SIDIS) process of unpolarized charged lepton on transversely polarized nucleon target. Unlike available treatments, in which some specific weighting functions are multiplied to separate theoretically motivated quantities, we do not introduce any weighting function following the analyzing method by the E704 experiment. The advantage is that this basic observable is free of any theoretical bias, although we can perform the calculation under the current theoretical framework. We present numerical calculations at both HERMES kinematics for the proton target and JLab kinematics for the neutron target. We find that with the current theoretical understanding, Sivers effect plays a key role in our analysis.     

Image formation in conventional brightfield reflection microscopes with optical sectioning property via structured illumination

We present a theoretical analysis of the image formation in conventional brightfield reflection microscopes with optical sectioning property via structured illumination. We show that the optically sectioned images obtained with this approach possess the optical sectioning strengths comparable to those obtained with the confocal microscope. We further show that the transfer function behaviour is directly comparable to that of the true confocal instrument. Some effects of spherical aberrations are included in the analysis. The theoretical considerations are compared with and confirmed by experimental results.     

Theoretical modelling of surface phonons

We present a mini review of progress made towards theoretical modelling of surface phonons. We outline the essential ingredients of two theoretical methods, viz. an adiabatic bond charge method for semiconductor surfaces and the ab-initio density-functional perturbation method for solid surfaces in general. From the results of theoretical calculations we establish trends and criteria for the existence of localized phonon modes on group-IV(001) and III-V(110) semiconductor surfaces. We further obtain signatures of characteristic vibrational modes which develop during dissociative molecular adsorption on Si(001) surfaces. The results are compared with available experimental measurements. Some remarks are forwarded regarding manipulation of surface phonon modes for scientific advances and technological applications.      

Thermodiffusion motion of electrically charged nanoparticles

The present work deals with experimental studies to examine the theoretical model of thermodiffusion of electrically charged nanoparticles. Three different ionic magnetic colloid samples have been synthesized and profoundly analyzed. The theoretical model is a classical one, based on the calculation of the temperature and the electric potential distribution around nanoparticles. The discrepancy between experimental data and theory turns out not to exceed 20%. We focus on applying different approximations between calculated electrical double layer in the theoretical model and experimental determination of the surface charge density of colloidal particles. We assume this is the main reason for obtained discrepancy.     

Spatiotemporal optical modulation instability of coherent light in noninstantaneous nonlinear media

We report on the theoretical derivation and experimental observation of spatiotemporal modulation instability (MI) of a coherent light beam in noninstantaneous nonlinear media. We obtain analytically the MI growth rate as a function of the spatial and temporal frequencies of the perturbation and the material response time. In the experiment, we observe that the varying speed of the MI patterns increases with the decreased material response time. We also observe that increasing the material response time can arrest the MI, agreeing with our theoretical derivation.     

Contemporary electrostatics—II: Ionization charging and insulation

In this article we examine the available evidence concerning the existence of magnetic charge. We find that the experimental evidence against it is very strong. We also find that its discovery would cause considerable difficulty in conventional theoretical physics, but that no conclusive theoretical argument against its existence has yet been found. The apparent absence of magnetic charge in nature remains unexplained and rather disquieting.