The Nonlinear Singularly Perturbed Nonlocal Reaction Diffusion Systems

In this paper the singularly perturbed initial boundary value problems for a nonlocal reaction diffusion system are considered. Using the iteration method and the comparison theorem, the existence and asymptotic behavior of solutions for the problem are studied.     

凸显从生活走向物理的理念关注学生能力的提升——关于粤教版"作用力与反作用力"的教学

“理解牛顿运动定律,用牛顿运动定律解释生活中的有关问题”是课程标准针对“牛顿运动定律”提出的内容标准．粤教版“作用力与反作用力”是一节探究课,如何提高科学探究的质量,使物理教学更贴近学生生活、联系社会实际,凸显从“生活走向物理”、“从常识走向科学”的理念,     

Effect of Precursor Mechanism on CO-NO Catalytic Reaction on Body-Centred Cubic Structure： Monte Carlo Simulation

The CO-NO catalytic reaction on body-centred cubic （bcc） lattice is studied by Monte Carlo simulation. The simple Langmuir-Hinshelwood （LH） mechanism yields a steady reactive window, which is separated by continuous and discontinuous irreversible phase transitions. The effect of precursor mechanism on the phase diagram of the system is also studied. According to this mechanism, the precursor motion of CO molecules is considered only on the surface of bcc lattice. Some interesting observations are reported.     

Synthesis of Cubic Boron Nitride by the Reaction of Li3N and B2O3

Cubic boron nitride is synthesized by the reaction of Li3N and B203 under high pressure and high temperature （4.0-5.0 GPa, 1350-1500℃）. The minimum pressure of cBN formation is 4.0 GPa. The present condition of cBN formation is clearly lower than the eutectic temperature of Li3BN2 and BN in the Li3N-hBN system （5.5 GPa, 1610℃）. The content of cBN in the sample increases, while the content of hBN decreases with the temperature and pressure. The maximum conversion rate （5.0 GPa, 1500℃） is about 34%, which is higher than that in the hBN-Li3N system. The cBN crystals are octahedral or tetrahedral in shape and approximately 20 μm in diameter.     

Resonance Conversion as a Catalyzer of Nuclear Reactions

It is shown that resonance internal conversion offers a feasible tool for mastering nuclear processes with laser or synchrotron radiation. The physics of the process is discussed in detail in a historical aspect. Possible experimental application is shown in the case of the M1 70.6-keV transition in nuclei of 169 Yb. The nuclear transition rate in hydrogen-like ions of this nuclide can be enhanced by up to four orders of magnitude.     

Isospin Effect on Relative State Population Temperature in Reactions ^40Ar＋^112,124Sn at 30 MeV／u^1

An array of 13 detector telescopes has been used for detecting small-angle particle-particle correlations in the reactions ^40Ar^ 112,124Sn at 30 MeV/u. The α-α correlation functions were extracted from two-particle coincident events. A three-body trajectory code MENEKA was used to calculate the background correlation function. The detection efficiency was calculated by using the Monte-Carlo method.     

“牛顿第三定律”重难点突破的教学案例

1教学背景对于力的作用的相互性,学生在初中物理的第三章"相互作用"中已初步了解.通过调查发现,学生对力的作用的相互性的认识大多是死记硬背,比较笼统和模糊.譬如如何用事实来证明力的作用的     

步进摩擦分析测试平台的研制

研制了步进摩擦分析测试平台,可用于检测人体在静止及运动路面上的步进摩擦特性.该平台主要由六自由度摇摆台、三维测力台和数据采集系统三部分构成,六自由度摇摆台可提供六个自由度的任意组合运动,用来模拟舰船、海浪和地震等工况;三维测力台可测量出人体在行走时的三维力和力矩;数据采集系统将六自由度运动平台和三维测力台的输出数据采集并保存到计算机中,用来分析人体运动时的步进摩擦特性.采用研制平台进行了一组试验,结果表明:人在上、下坡行走时的垂直地面反作用力与在水平路面行走时的垂直地面反作用力具有不同的分布规律,并且垂直地面反作用力均随坡度角的增大而减小.     

拔河比赛的物理模型

拔河比赛是一种体育运动,也是一种常见的物理现象.教学实践发现,由于对拔河比赛的物理模型不明确引起的困惑非常普遍,最常见的疑问有:为什么没提及拔河中的重要器材--绳子?"甲对乙的拉力"是甲对绳子的拉力呢,还是绳子对乙的拉力呢?如何理解"甲对乙的拉力和乙对甲的拉力是一对作用力和反作用力"?"甲获胜是甲的摩擦力大于乙的摩擦力"?现就拔河比赛的物理模型讨论于下.