基础隔震建筑的滑模控制

基于滑模控制理论,提出了地震激励下含有不确定性参数的隔震建筑结构的滑模控制方法。通过优化极点配置,设计了鲁棒滑面和相应的滑模控制器。算例控制模拟的结果表明,该控制方法能有效抑制具有不确定参数的结构响应,受限控制的效果也较好。     

论书籍形态设计要素的创新与发展

书籍是人类表思传知、积累文化的重要载体.书籍形态设计也伴随时代的进步不断发展.分析了书籍形态设计发展演变的进程,并提出了未来书籍设计师的责任,对今后书籍设计发展有一定的意义.     

Measurement of the Properties of a Plasma Column Used as a Radiating Element

This paper presents two test benches for the characterization of a plasma column used as a radiating element. In particular, the main parameters to be quantified are the efficiency of the plasma antenna, the turn-on time of the column, and the conductivity of the plasma. The first two parameters are evaluated by measuring the field radiated by the plasma antenna compared with that of an equivalent copper antenna. For the conductivity, a reflectometric technique is used, wherein the plasma column is inserted inside a waveguide. The accuracy of the method is limited by the ill-conditioned relationship between the reflection coefficient and the plasma conductivity; nevertheless, it is sufficient to subdivide the range of the conductivity values into three regions (i.e., low, medium, and high conductivities) to determine the best operating conditions of the antenna.     

Metrological Assurance as a Base for Building a Quality System

We consider the role of metrological assurance of quality systems in the initial stage of development, based on the ISO 9000 standards. Most of the quality system elements must be developed with account for the requirements of the standardizing documents for metrological assurance of production. The body of actual standardizing documents of the state measurement traceability system given is expedient for use when developing company quality systems.     

Formation of Sets of Independent Components of a Multidimensional Random Variable Based on a Nonparametric Pattern Recognition Algorithm

Measurement Techniques - We consider the possibility of circumventing the decomposition problem for the range of values of random variables when testing various hypotheses. A brief review of the...     

包装企业构建绿色管理模式的研究

高价资源、能源和高环保条件下的中国包装企业必须走绿色之路,才能实现其可持续发展,而绿色管理是实现这一目标的根本保证.绿色管理的有效性取决于企业绿色管理模式的构建,文章分析了包装企业绿色管理模式的内容,探讨了构建方法.     

Formation of a layer of a liquid as it impinges on a horizontal plane

We have conducted a numerical study of the spreading out of a liquid over a horizontal plane, with the liquid, in this case, running off over the surface of a semiinfinite vertical cylinder.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 57, No. 6, pp. 896–600, December, 1989.     

反应准备方式对空间线索作用的影响

采崩反应线索范式，分别探讨了在线索准备反应位置和线索准备反应器条件下的线索效应模式。结果发现：①在双手自然放置时，反应准备方式对线索效应模式没有显著影响。②在双手非自然放置时，当线索准备反应器时，左右手的编码作为反应的空间参照系对于左右线索的加工起到了显著的促进作用；但当线索准备反应位置时，左右手的空间参照作用不显著。     

有限—离散杂交元岩石爆破漏斗数值模拟研究

为了验证有限—离散杂交元模拟岩石爆破结果的真实性、可靠性,对岩石爆破漏斗产生过程进行了数值模拟。采用联合单一与弥散裂纹模型实现从有限元模拟到离散元模拟的转化,应用等截面管道模型模拟爆破气体对裂缝的扩张作用。模拟结果表明:有限—离散杂交元能够模拟出岩石爆破中应力波的产生、传播及在自由面反射的整个过程,能够再现岩石破碎的产生、裂隙的扩展及碎石的抛掷过程。模拟出的岩石爆破的主要分区,即破碎区、裂隙区、和弹性区,与理论研究相符,监测点的应力时程曲线与文献中的结果具用相同特征。因此有限—离散杂交元能够模拟出爆破漏斗产生的整个动态过程,为岩石爆破理论的研究提供了新的手段。     

Formation of novel thermoplastic composites using bicomponent nonwovens as a precursor

This study focuses on a novel technique to produce thermoplastic composites directly from bicomponent nonwovens without using any resins or binders. Conceptually, the structure of the bicomponent fibers making up these nonwovens already mimics the fiber–matrix structure of fiber reinforced composites. Using this approach, we successfully produced isotropic thermoplastic composites with polymer combinations of polyethylene terephthalate/polyethylene (PET/PE), polyamide-6/polyethylene (PA6/PE), polyamide-6/polypropylene (PA6/PP), and PP/PE. The effects of processing temperature, fiber volume fraction, and thickness of the preform on the formation and structure of the nonwoven composites were discussed. Processing temperatures of 130 and 165 °C for PE and PP matrices, respectively, resulted in intact composite structures with fewer defects, for fiber volume fraction values of up to 51%. Moreover, an insight into the changes on the fine structure of the bicomponent fibers after processing was provided to better explain the mechanics behind the process. It is hypothesized that the composite fabrication process can result in annealing and increases the degree of crystallinity and melting temperature of polymers by thickening lamellae and/or removing imperfections. One of the other outcomes of this study is to establish what combination of mechanical properties (tensile and impact) nonwoven composites can offer. Our results showed that compared to glass mat reinforced thermoplastic composites, these novel isotropic nonwoven composites offer high specific strength (97 MPa/g cm⁻³ for PA6/PE), very high strain to failure (152% for PP/PE), and superior impact strength (147 kJ/m² for PA6/PP) which can be desirable in many critical applications.     

生成项模型在二氧化钛颗粒合成中的应用

为了更好地研究二氧化钛纳米颗粒合成过程中生成项模型以及表面氧化反应对颗粒尺寸的影响,用CFD商业软件Fluent,对湍流扩散火焰中的颗粒合成过程进行了详细的数值模拟。在没有通入TiCl4先驱物的情况下,计算出火焰的温度场。然后通过对五种不同工况的对比,讨论了火焰场温度和浓度对颗粒生长的影响。在此基础上考虑了表面氧化反应对颗粒尺寸变化的影响。结果表明：表面氧化反应对颗粒尺寸的分布具有一定影响,但是温度才是颗粒尺寸变化的最主要影响因素。     

An Experimental and Numerical Study of Transversal Dispersion of Granular Material on a Vibrating Conveyor

The mixing of thin granular layers transported on the surface of an oscillating trough is experimentally and numerically examined. The particle dispersion was experimentally quantified by an image processing system recording the growth of the mixing layer thickness of two differently colored but otherwise identical sand particle streams along the longitudinal position within the transporting channel. Granular flow and dispersion on the vibrating conveyor were studied numerically based on a three-dimensional discrete element code. Both experiments and simulations were used to derive quantities characterizing the transversal dispersion. The mixing was found to be directly proportional to the vertical acceleration of the conveyor and inversely proportional to the mass flow of the transported material. Keeping the above-mentioned parameters constant, the dispersion increases with increasing mean particle diameter. When performing the experiments with materials of different mean particle diameters and tuning the mass flow to achieve the same level of dimensionless bed height, the magnitude of the dispersion coefficient remains constant, as was also confirmed by the numerical simulation.     

Formation of the physicochemical mechanics of materials as a new direction of science

We analyze the development of investigations and scientific results in the field of physicochemical mechanics of materials, which plays the role of contemporary scientific direction in materials science. The main stages of development of this direction in the Ukrainian National Academy of Sciences are considered and the role of H. V. Karpenko in the formation and development of this branch of science is described. We also synthesize the most important scientific results, illustrate some their practical applications, and formulate urgent problems of the future investigations.     

公共建筑公共卫生间空调方式的探讨

讨论了公共建筑公共卫生间设置空调的方式，提出在满足“过渡性舒适”的前提下，对于建筑内区的公共卫生间，以通风的方式可以满足温度的要求，对于建筑外区的公共卫生间，在排风的同时辅助送入一定量的新风也可以满足温度的要求。     

Concept of Formation and Work of CaO Coatings in the Mode of Self-Healing

On the basis of an analysis of obtained results and literature data, we propose a kinetic model of the interaction of components in the Li[Ca]–V[O] system. The model demonstrates the cyclicity of the process. Each cycle consists of the following stages: (1) transfer of oxygen from vanadium to lithium, (2) growth of an external CaO oxide layer with simultaneous dissolution of dispersed titanium oxides in the matrix and transfer of oxygen and titanium into the solid solution, (3) penetration of the liquid metal into the solid one by the reaction-diffusion mechanism, and (4) decay of metastable triple oxide and restoration of an external CaO oxide layer. Within the framework of the model proposed, we develop the concept of work of the CaO oxide coating under isothermal conditions and in the heating–cooling mode.     

基于人机界面发展模式的研究及其应用分析

从人机界面概述到评价体系系统,阐述了人机界面趋向智能化,自然化,人性化的发展模式,提供了多种未来可实现的模型及其扩展研究.同时,多通道输入(声音,视觉识别,手势)及输出技术作为对人机界面的补充技术之一,也将扮演更重要的角色.总之,人机界面设计的发展前景极其宽广,将会成为未来设计领域的重要组成部分.