工程图学在堆垛方式与堆垛强度研究中的应用

指出了堆垛强度的计算方法，阐述了堆垛方式对堆垛强度的影响，得出了齐平式堆压强度最高，而交错式堆垛稳定性最好的结论，计算机辅助设计使计算更准确、合理。     

堆垛方式对堆垛强度的影响

对瓦楞纸箱包装的各种堆垛方式进行受力分析，阐述堆垛方式对堆垛强度的影响，得出纵横交错式堆垛的耐压强度最低，而齐平式堆垛其耐压强度最高的结论。     

直拉硅中氧化诱生层错研究进展

硅中的氧化诱生层错（OSF）是一种重要的工艺诱生缺陷,会对微电子器件产生重大的影响,为提高硅片质量,要求对OSF有充分了解。综述了氧化诱生层错的研究进展,着重讨论了OSF的形成动力学、影响因素和检测方法,并指出：OSF是一种由点缺陷行为决定的工艺诱生缺陷。     

镁合金中的长周期有序堆垛结构

本文详细阐述了镁合金中长周期有序堆剁相的最新研究进展，对镁合金中长周期有序堆剁相的结构进行了系统的论述，展望了镁合金中的长周期有序堆剁结构的研究趋势。     

Stacking Defects in C60 Films

The structure of pollycrystalline C₆₀ films prepared by sublimation from 99.9% pure C₆₀ powder and from graphite soot was investigated by X-ray diffraction. A complex fcc (111) line was found in the former samples. Comparison of experimental and simulated (111) profiles allowed to assess quantitatively the degree of stacking disorder introduced during the growth of the film. Probabilities could be derived for continuation of already started fcc and hep sequences, thereby characterizing the statistical microstructure of the C₆₀ films. Also, the relative magnitudes of inter- and intra-layer disorder can be estimated. The films deposited from graphite soot show a high structural disorder.     

4H-SiC晶体中的层错研究

采用物理气相传输法(PVT法)在4英寸(1英寸=25.4 mm)偏<11¯20>方向4°的4H-SiC籽晶的C面生长4H-SiC晶体。用熔融氢氧化钾腐蚀4H-SiC晶体, 并利用光学显微镜研究了晶体中的堆垛层错缺陷的形貌特征和生长过程中氮掺杂对4H-SiC晶体中堆垛层错缺陷的影响。结果显示, 4H-SiC晶片表面的基平面位错缺陷的连线对应于晶体中的堆垛层错, 并且该连线的方向平行于<1¯100>方向。相对于非故意氮掺杂生长的4H-SiC晶体, 氮掺杂生长的4H-SiC晶体中堆垛层错显著偏多。然而, 在氮掺杂生长的4H-SiC晶体的小面区域, 虽然氮浓度高于其他非小面区域, 但是该小面区域并没有堆垛层错缺陷存在, 推测这主要是由于4H-SiC晶体小面区域特有的晶体生长习性导致的。     

Human low-density lipoprotein-coated capillaries in electrochromatography

Low-density lipoprotein (LDL) particles were immobilized on the inner wall of a fused-silica capillary and used in a study of the interactions between LDL and neutral drugs in electrochromatography. The effect of coating parameters (pH, ionic strength of the coating solution, duration of the coating procedure) on the properties and stability of the coating was examined. The stability of the coating was highest when the pH of the coating solution was under the pI value of the LDL particles. Interactions of unmodified LDL coatings with drugs were compared with those of acetylated LDL coatings. Acetylation of LDL neutralizes the positive charge on the lysine residues of the protein component of LDL particles, and acetylated LDL was used as a reference to examine the effect of the positively charged amino acids in the unmodified coating. Under similar coating conditions, acetylated LDL coating yielded stronger EOF evidently due to the decreased number of positive charges on LDL particles. The interactions of the unmodified and acetylated LDL coatings with steroids aldosterone, testosterone, and progesterone were comparable, which indicates that the density of immobilized LDL particles is not appreciably altered by acetylation. As expected, the strength of the interactions between steroids and the LDL coating increased with hydrophobicity of the drug.     

Stacking Fault Energy in 4He Crystals

Recently observed non-classical rotational inertial (NCRI) in solid ⁴He is most probably related to defects which appear during the sample preparation. We have measured the energy of the stacking fault (SF) in an hcp ⁴He crystal at 0.2 K. The SF creates a groove with a dihedral angle of 155±5° on the crystal surface in a quasi-equilibrium with the liquid. The obtained value for the SF energy is (0.07±0.02) mJ/m², which is ～0.4 of the surface tension of the liquid–solid interface of ⁴He. Our findings suggest that the phenomenon of burst-like creation of new atomic layers might be accompanied by the creation of SFs.     

Edge States and Stacking Effects in Nanographene Systems

Bilayer graphene nanoribbon with a zigzag edge is investigated with the tight binding model. Two stacking structures, ?? and ??, are considered. The band splitting is seen in the ?? structure, while the splitting in the wave number direction is found in the ?? structure. The local density of states in the ?? structure tend to avoid sites where inter-layer hopping interactions are present.     

Stacking fault energies and slip in nanocrystalline metals

The search for deformation mechanisms in nanocrystalline metals has profited from the use of molecular dynamics calculations. These simulations have revealed two possible mechanisms; grain boundary accommodation, and intragranular slip involving dislocation emission and absorption at grain boundaries. But the precise nature of the slip mechanism is the subject of considerable debate, and the limitations of the simulation technique need to be taken into consideration. Here we show, using molecular dynamics simulations, that the nature of slip in nanocrystalline metals cannot be described in terms of the absolute value of the stacking fault energy-a correct interpretation requires the generalized stacking fault energy curve, involving both stable and unstable stacking fault energies. The molecular dynamics technique does not at present allow for the determination of rate-limiting processes, so the use of our calculations in the interpretation of experiments has to be undertaken with care.     

Mass transfer in capillaries with absorbent walls

We considered the problem of the transfer of a substance for a liquid to the absorbent surface of a circular capillary. We conducted a general analysis. Using the method of two-time formalism, we found the solution of the problem in one special case.Translated from Inzhernerno-Fizicheskii Zhurnal, Vol. 50, No. 3, pp. 418–423, March, 1986.     

包装结构设计软件TOPS Pro中的堆码强度分析

在介绍如何用TOPS Pro包装结构设计软件TOPS Pro中的堆码强度分析进行运输包装设计中堆码强度分析的基础上,详细阐述了计算外包装瓦楞纸箱抗压强度的McKee公式及其在TOPS Pro堆码强度分析中的应用.     

Geometry-induced fluorescence resonances in small lossy capillaries

We report the first experimental demonstration of cavity-induced resonances that occur without total internal reflection. We obtained these resonances by observing the fluorescence spectrum from the molecules enclosed within a small, lossy capillary of the type used for capillary zone electrophoresis. Even with weak reflections from the capillary inner walls, enough feedback exists to superimpose resonances on the otherwise smooth fluorescence spectrum. These resonances, commonly called morphologydependent resonances or whispering-gallery modes, have typically been observed only in cavities in which total internal reflection is present.     

Heat transfer in boiling neon in vertical capillaries

Values for the burnout heat flux and critical temperature difference are measured in boiling neon on the internal surface area of vertical capillaries. A hysteresis is observed as power increases and decreases, which becomes weaker after several increases of power up to the critical heat flux point. The characteristics of the dependences obtained are discussed.     

提高大型木包装箱堆码强度的侧立柱改进设计方法

结合材料力学的受力分析方法,以不同的底座形式及其对应的不同的包装箱尺寸为例,对包装箱分别承受均布载荷和集中载荷条件下的堆码强度进行受力分析,校核侧立柱的堆码强度,改进堆码强度的设计方法,为堆码强度的设计、分析研究提供参考依据.