The Deformations Energy and Barrier Height of Super Heavy Nuclei

The liquid drop energy and barrier height are calculated for the super heavy nuclei ²⁵⁰X and ²⁵¹X, resulting from heavy ion reactions, at finite temperatures. Our calculations are compared with both the idealized nuclei ²⁵⁰Es and ²⁵¹ Es (being isobars of ²⁵⁰X and ²⁵¹X) and that obtained by previous work. The main reason of the descrepancies between the present calculated values of the barrier height and the fissility parameters and those obtained by others are found to be mainly due to the important role of Coulomb energy over the surface energy for heavy nuclei. It has been found that the temperature has the effect lowering the fission barrier and shifting the saddle point to lower values.     

结构高度对纳米液滴碰撞壁面过程的影响

液滴与壁面的碰撞过程广泛存在于自然界以及各类生产生活中,探究其传热传质作用机理以及形态演变对发展表面自清洁、喷墨打印、强化滴状冷凝、抗结冰结霜等技术都具有重要意义。为了探究结构高度在碰撞过程中的作用,本文通过分子动力学模拟对纳米液滴与壁面的碰撞过程进行了研究。构建了具有方柱状结构的粗糙表面模型,研究了壁面上纳米柱状结构的高度对碰撞过程的影响,记录了液滴的变形过程,并对相关的动力学特征以及能量变化进行了分析。     

纳米柱高度对GaN基绿光LED光致发光谱的影响

纳米柱结构是释放高In组分InGaN/GaN绿光LED量子阱层应变的有效方法。本文采用自组装的聚苯乙烯微球掩模、感应耦合等离子体干法刻蚀和KOH溶液的湿法腐蚀,在GaN基绿光LED外延片上制备了3种高度的纳米柱结构,通过扫描电子显微镜观察纳米柱结构的形貌,并测试了常温和10 K低温时的光致发光谱(PL)。结果表明:应变释放对压电场的影响显著,使得纳米柱结构样品的内量子效率(IQE)提高,PL谱峰值波长蓝移;应变在量子阱中的不均匀分布还使得PL谱半高全宽(FWHM)展宽。与普通平面结构相比,高度为747 nm的纳米柱结构可使得IQE提升917%,PL谱峰值波长蓝移18 nm、FWHM展宽7 nm。另外,纳米柱结构样品的有源区有效面积减小可使得PL谱FWHM减小。     

The Height Fluctuations of an Off-Critical Dimer Model on the Square Grid

The dimer model on a planar bipartite graph can be viewed as a random surface measure. We study these fluctuations for a dimer model on the square grid with two different classes of weights and provide a condition for their equivalence. In the thermodynamic limit and scaling window, these height fluctuations are shown to be non-Gaussian.     

水稻植株高矮突变系材料的株高性状与产量等相关性分析

对利用N离子束和γ射线诱变获得的粳稻日本晴和籼稻“9311” 89份株高突变体的株高性状和产量性状进行了相关分析。 结果表明, 株高和水稻的产量与其构成因素: 穗粒数、 结实率、 千粒重以及穗长、 单株茎秆干重有着一定的相关性。 株高与穗长、 穗粒数、 千粒重、 单株茎秆干重、 单株生产力呈极显著的正相关, 与有效穗数呈极显著的负相关。 通过对株高与其他产量结构因素的相关分析, 进一步了解了株高的变异对于水稻经济产量因素的影响。 The total 89 plant height mutant lines induced from rice cultivars Nipponbare and “9311” by ion beam implantation and γ rays irradiation were used for analysis of the correlation between plant height and yield component. The results indicated spike length, ear grains, thousand grain weight, stem dry weight and yield have significantly positive correlation with the plant height, while the number of productive ear has significant negative correlation with it. The correlation analysis of the plant height and yield component will help to reveal the influence of the plant height and the factors of yield component.     

Mo2C膜表面高度和高差分布规律研究

介绍了金属有机气相沉积（ＭＯＣＶＤ）制备Ｍｏ２Ｃ功能膜的过程和对膜表面粗糙度的测量结果;在测量基础上进行统计,找出Ｍｏ２Ｃ膜表面高度和高差分布规律;将ＤＴ２模型推广,进行２＋１维计算机模拟,作出Ｍｏ２Ｃ膜表面３维模拟图。结果表明：实验测得的高度和高差统计分布与计算机模拟的结果一致。     

A Model of Subdiffusive Interface Dynamics with a Local Conservation of Minimum Height

We define a new model of interface roughening in one dimension which has the property that the minimum of interface height is conserved locally during the evolution. This model corresponds to the limit q of the q-color dimer deposition-evaporation model introduced by us earlier [Hari Menon and Dhar, J. Phys. A: Math. Gen. 28:6517 (1995)]. We present numerical evidence from Monte Carlo simulations and the exact diagonalization of the evolution operator on finite rings that growth of correlations in this model is subdiffusive with dynamical exponent z2.5. For periodic boundary conditions, the variation of the gap in the relaxation spectrum with system size appears to involve a logarithmic correction term. Some generalizations of the model are briefly discussed.     

栅极和阴极的相对高度对电子传输比的影响

用边界元法(BEM)和Monte Carlo方法,对一种基于碳纳米管场发射大面积彩色平面型显示器的电子传输比进行了理论分析,通过模拟跟踪发射电子轨迹,证实改变阴极和栅极的相对高度,可以较大幅度地提高电子传输比阳极上电子的分布证实,我们设计的显示器结构能够满足高分辨率、高亮度的显示的要求,而且驱动电压低,工艺简单。     

Limit Theorems for Height Fluctuations in a Class of Discrete Space and Time Growth Models

We introduce a class of one-dimensional discrete space-discrete time stochastic growth models described by a height function h_t(x) with corner initialization. We prove, with one exception, that the limiting distribution function of h_t(x) (suitably centered and normalized) equals a Fredholm determinant previously encountered in random matrix theory. In particular, in the universal regime of large x and large t the limiting distribution is the Fredholm determinant with Airy kernel. In the exceptional case, called the critical regime, the limiting distribution seems not to have previously occurred. The proofs use the dual RSK algorithm, Gessel's theorem, the Borodin–Okounkov identity and a novel, rigorous saddle point analysis. In the fixed x, large t regime, we find a Brownian motion representation. This model is equilvalent to the Seppäläinen–Johansson model. Hence some of our results are not new, but the proofs are.     

Conserved Sandpile with A Variable Height Restriction

We study a restricted-height version of the one-dimensional Oslo sandpile with conserved density by using periodic boundary conditions. Each site has a limiting height which can be either two or three. When a site reaches its limiting height, it becomes active and may topple, loosing two particles, which move randomly to nearest-neighbor sites. After a site topples, it is randomly assigned a new limiting height. We study the model using mean-field theory and Monte Carlo simulation, focusing on the quasi-stationary state, in which the number of active sites fluctuates about a stationary value. Using finite-size scaling analysis, we determine the critical particle density and associated critical exponents.     

Height Fluctuations in the Honeycomb Dimer Model

We study a model of random surfaces arising in the dimer model on the honeycomb lattice. For a fixed “wire frame” boundary condition, as the lattice spacing ϵ → 0, Cohn, Kenyon and Propp [3] showed the almost sure convergence of a random surface to a non-random limit shape Σ₀. In [12], Okounkov and the author showed how to parametrize the limit shapes in terms of analytic functions, in particular constructing a natural conformal structure on them. We show here that when Σ₀ has no facets, for a family of boundary conditions approximating the wire frame, the large-scale surface fluctuations (height fluctuations) about Σ₀ converge as ϵ → 0 to a Gaussian free field for the above conformal structure. We also show that the local statistics of the fluctuations near a given point x are, as conjectured in [3], given by the unique ergodic Gibbs measure (on plane configurations) whose slope is the slope of the tangent plane of Σ₀ at x.     

固体浸没透镜飞行高度的气浮控制

采用固体浸没透镜的光存储方法是提高光存储密度的比较实用的近场光存储方法,而严格控制SIL下底面与光存储介质之间的亚波长级距离是此光存储系统正常工作的前提.本文采用电容法测量SIL的飞行高度,采用弹性悬臂将SIL加载在转盘表面上,转盘以不同速度转动时SIL将悬浮在不同的高度.计算机首先采集到SIL的飞行高度信息,再与设定的飞行高度作比较,根据比较结果调整转盘转速,从而达到调整SIL飞行高度的目的.采用此方法,可以动态地将SIL的下底面控制在距高速转动的转盘表面上150～600 nm范围内的一定高度上.     

Height distribution on a rough plane and specularly diffracted light amplitude are Fourier transform pair

In this report we show that the amplitude of specularly diffracted light from a plane rough surface as a function of incident angle cosine is Fourier transform of the height distribution on the surface. Therefore, an even height distribution function, which is the case for many rough surfaces, can be obtained by measuring the specularly diffracted light intensities. Also, it is observed that for polychromatic illumination the spectrum of the specularly diffracted light is modified and the modification depends on roughness, incident angle, and wavelength. It is also shown that, for a fixed incident angle, the height distribution on the rough plane is Fourier transform of the spectral modifying function. Experimental studies on some surfaces of different roughnesses, prepared by grinding sheet-glasses by powders of different grain sizes, show that the corresponding height distributions are Gaussian and the rms heights obtained by the two approaches are quite consistent.     

Structure of two-dimensional sandpile. I. Height probabilities

The height probabilities of the two-dimensional Abelian sandpile model are the fractionial numbers of lattice sites having heights 1, 2, 3, 4. A combinatorial method for evaluation of these quantities is proposed. The method is based on mapping the set of allowed sandpile configurations onto the set of spanning trees covering a given lattice. Exact analytical expressions for all probabilities are obtained.     

Height gauge based on dual polarization competition laser

Based on dual polarization competition laser, we develop a new height gauge. By inserting a quartz crystal plate into the laser cavity, one laser beam splits into two orthogonally linear polarized laser beams, which appear one after another with the change in cavity length. After detecting their intensities, we obtain two power-turning curves. The longitudinal mode spacing is divided into 4 equal zones and each one has different intensity phenomena, which provides a new method of height measurement. According to experiments, the direct measuring range of this new method is 12 mm with resolution of 79.1 nm, and the indirect measuring range can be increased using first grade gauge blocks and a liftable platform. Compared to other height gauges such as vernier gauge, inductance sensor and gauge block interferometer, this new instrument has the advantage of self-calibration and simple structure without frequency stabilization system.     

傅里叶变换轮廓术中物体高度最佳恢复条件

在分析傅里叶变换轮廓术中传统的高度与相位关系的基础上,推出了高度与相位的普通关系式,提出了物体高度最佳恢复条件的新理论,给出了简单的物理解释.由此得出结论：物体高度最佳恢复时的几何参量α（双瞳连线与参考面夹角）大小与系统几何结构参量a、b有关.计算机仿真验证了：当a=600 mm、b=3 000 mm时,可得物体高度最佳恢复时的α=arcsin (1/5),此时所得的标准差为0.269 7;作为对比：当α=0时,所得的标准差为0.295 6.实验验证了：α=arcsin (1/5)时的恢复效果比α=0时的恢复效果更好些.