管路长度确定的图解法

1引言画法几何学不仅为机械制图提供了理论基础，而且为图解空间几何问题提供了一种手段。化工生产中经常涉及管路的连接、定位等问题。而管路的倾角、长度的准确与否，直接影响使用效果，如果利用画法几何原理将生产中的管路连接形式简化成画法几何模型、精确图解出管路的倾角，长度等，可使管路长度的确定更加方便、准确、省时，提高工作效率，满足设计要求。2画法几何模型的建立与国象实际生产中的空间计算问题千变万化，管路的直径大小不一，但我们都可以把它简化成点、线表示，转化成画法几何的解题模型。利用画法几何学原理解决。（1…     

基于VBA的CorelDraw服装结构设计插件开发研究

通过对CorelDraw在服装行业中的应用分析,提出利用CorelDrawVBA开发服装结构设计插件来提高CorelDraw在服装结构制图中的适用面及其工作效率的开发研究设想,并开发出符合服装结构制图习惯的CorelDraw服装结构设计插件。     

啮合型同向旋转双螺杆螺纹头数选择及螺杆间隙设计

本文从双螺杆啮合几何学出发,分析了啮合型同向旋转双螺杆各功能段螺纹头数选择准则,探讨了这类双螺杆挤出机中三种典型螺杆间隙的设计方法。这些准则及方法可直接用于指导螺杆结构设计。     

服装表演实践活动的探索与研究

针对高校服装表演专业的教学与市场实际需求的衔接存在着相互脱节的问题，探讨了一种新的教学模式，服装表演专业的教学要充分与市场接轨，以便更好的做到理论与实践相结合，从而使本专业向更高水平迈进。     

铸石熔体中晶体生长几何学研究

前言有关熔体中多晶体生长的研究,国内外侧重于两个方面开展工作。一是晶核形成和晶体生长的热力学研究;另一方面则是晶核形成及晶体生长的几何过程及其所成就之形态与生长环境间的关系的研究,即晶体生长的几何学研究。本文涉及有关的近代晶核形成理论等,着重对铸石熔体中两种结晶中心(磁铁矿和铬铁矿)和主晶相(辉石)的晶体生长几何学问题进行探讨。     

复合材料结构软设计前景初探

文中论述了复合材料结构设计向软化发展的客观历史必然性，简要介绍了几个复合材料力学的软科学方法处理手段，并预测，一个新的设计理论－复合材料结构设计理论必将出现。     

利用国产耐高温纤维开发蒸汽防护服装

分析了国内外蒸汽防护服装的研究现状,利用国产耐高温纤维,从蒸汽防护面料的开发、蒸汽防护服装的结构设计等方面进行了研究,并对蒸汽防护性能进行了测试。结果表明:开发的蒸汽防护面料和服装具有耐高温、防蒸汽渗透和隔热性能,能够满足安全防护需求。     

分形及其在耐火材料研究中的应用

介绍了分形几何学的基本概念及随机分形维数的测定方法。并以O'－Sialon-ZrO2为例，讨论了并在耐火材料研究中的应用。     

旋流板几何参数的设计计算

对于旋流板几何参数的设计计算及叶片图形画法，近十年来发表了各种方法和公式，产生了一定程度的混乱。本文通过系统地分析比较，对旋流板几何参数的准确计算，以及叶片图形的准确画法作一澄清。     

有限元分析在轮胎设计中的应用

综述了轮胎分析理论的发展与内容，介绍了有限元理论在轮胎结构设计中的进展。文中着重介绍了有限元分析技术在轮胎接触以及轮胎在稳态与动态下温度场分布问题上的应用。     

Curvature effects on electric-double-layer capacitance

Understanding the microscopic structure and thermodynamic properties of electrode/electrolyte interfaces is central to the rational design of electric-double-layer capacitors (EDLCs). Whereas practical applications often entail electrodes with complicated pore structures, theoretical studies are mostly restricted to EDLCs of simple geometry such as planar or slit pores ignoring the curvature effects of the electrode surface. Significant gaps exist regarding the EDLC performance and the interfacial structure. Herein the classical density functional theory (CDFT) is used to study the capacitance and interfacial behavior of spherical electric double layers within a coarse-grained model. The capacitive performance is associated with electrode curvature, surface potential, and electrolyte concentration and can be correlated with a regression-tree (RT) model. The combination of CDFT with machine-learning methods provides a promising quantitative framework useful for the computational screening of porous electrodes and novel electrolytes.     

物料破碎卸料坑画法几何设计

介绍了破碎机卸料坑（即料斗）设计中需要考虑的几个基本因素——料斗容积、卸料边数及料斗形式、出料口尺寸和内壁设计。在此基础上,通过单边卸料斗和三边卸料斗的画图实例,详细介绍了依据画法几何知识并利用绘图软件进行料斗未知边设计的求解方法。     

Ozone Production by an Ultra-Short Triggered Dielectric Barrier Discharge.

This work was motivated by the ozone production improvement by a dielectric barrier discharge supplied with a high voltage triggered pulsed generator. Particular attention was focused on the ozone generator cell geometry and on the type of electrical generator. A comparative parametrical analysis on two configurations of reactor was performed: an annular and a surface configuration. This study emphasizes that surface discharges coupled to ultra-short triggered high voltage generators stand out as an efficient process to produce ozone in large quantities.     

Repartition du transfert electrochimique dans les electrodes de puissance

In order to interpret the disparity between performances obtained from fuel-cell electrodes and the orders of magnitude predicted on the basis of current-density/potential curves of simple elements of the electrode surface, a theory of the distribution of potential in power electrodes is presented.

The theory is based on the non-equipotential character of the constituent surface elements of an electrode of whatever geometry, and postulates the constancy of the current-density/potential relation defining local transfer in given chemical and physical conditions.

An application of the theory is presented for the case of sintered electrodes immersed in an electrolyte from which the electrochemically active compound is derived; this application shows the limitation of possibilities of electrochemical transfer to a very thin frontal layer of the electrode in previous designs of fuel-cell electrodes.

Two important consequences follow: the possible design of fuel-cell electrodes in which the electro-active material is carried to the active surface by injection of its solution through a sintered structure; and the lack of validity of conclusions as to the relative importance of the factors limiting electrode performance, based on the analysis of current-density/potential curves, unless the existence of a distribution of potential is taken into account.     

质子交换膜燃料电池催化剂性能增强方法研究进展

发展低成本、高性能的燃料电池催化剂是实现燃料电池商业化的关键。目前,铂基催化剂仍是动力燃料电池不可替代的主催化剂。本文综述了最近几年燃料电池催化剂增强方面的研究进展,探讨了新型催化剂材料的设计与制备以及提高催化剂活性或稳定性的方法,包括表面修饰、包覆、合金化、几何与电子结构以及晶体结构的调变、催化剂/载体相互作用等手段。开发高活性和高稳定性的非铂类催化剂是燃料电池催化剂的发展趋势和努力方向。其中,提高非铂燃料电池催化剂可靠性、稳定性和活性,迫切需要在燃料电催化理论、非铂催化剂理性设计、燃料电池水热管理、有序化膜电极等方面取得创新和突破。     

Optimal nanocone geometry for water flow

The pursuit, toward transport efficiency, is significantly necessary for energy conversion, water filtration. However, structure design, aiming at further enhancing nanoconfined water flow, is still lacking. With the motivation to bridge the knowledge gap, a simple yet practical model regarding the nanocone structure design is established. This research demonstrates that nanocone, with desirable opening angle and length, possesses the capacity to achieve the optimal flow behavior. Flow resistance occurring inside nanocones, and that at cone entrance, exit, are considered. Optimal nanocone geometry can be determined based on the minimization of total resistance. Results show that (a) suitable opening angle spans from 10° to 30° over a wide range of nanocone geometry; (b) evident decline tendency of the suitable opening angle toward the increasing surface wettability is captured; and (c) water transport capacity inside optimal nanocone is 4–50 times that within cylindrical nanopores. This article forms a theoretical framework for nanocone design.     

Coadsorption of CO and O on Ru(0001): A Structural Analysis by Density Functional Theory

Knowledge of the atomic geometry of a surface is a prerequisite for any detailed understanding of the surface's electronic structure and chemical properties. Previous studies have convincingly demonstrated that density functional theory (DFT) yields accurate surface atomic geometries and that reliable predictions concerning stable and metastable phases can be made on the basis of the calculated energetics. In the present work, we use DFT to investigate the atomic structure of four ordered coadsorbate phases of carbon monoxide and oxygen on Ru (0001). All of the structures have a (2 × 2) periodicity with differing concentrations of CO molecules and O atoms. For two of these phases dynamical low-energy electron diffraction (LEED) intensity analyses have been performed, and the agreement between our DFT- and the LEED-determined structures is found to be very good. We predict the atomic geometry of the third phase, for which no structural determination based on experiments has been made to date. We also predict the stability of a new ordered mixed phase.     

RPS理论在模具补偿曲面测量上的应用

本文介绍了RPS理论的基本内容、原理和几何意义,给出了三坐标测量机检测模具补偿曲面的实例,通过论证表明这是一种灵活、实用的建立坐标系方法。     

气孔结构对焦炭深层反应影响的初探

研究了气孔结构对焦炭深层反应的影响，并将分开可理论引入到气孔结构的研究中。     

Simulation on the Conductivity of Charging Stock with Percolation Structure in the Submerged Arc Furnace

Based on the fractal geometry, a new way for selecting material burden ratio and size distribution, named physical design of burden, which is different from stoichiometric weight of carbon burden, would play a more important role in the operation of submerged arc furnace process. Cold simulation investigation was carried out to find how the fraction and size of metal balls affects the specific conductivity of charge mixture, by applying the percolation structure theory. A parameter equation, s/s=A(F-Fc)v, was suggested to calculate the specific conductivity of the charge mixture.