共查询到19条相似文献,搜索用时 187 毫秒
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纳米材料、纳米技术运用到表面工程中,使表面工程的发展进入了新阶段,"纳米表面工程"这一全新的概念应运而生。文章借助自然辩证法和科学技术辩证法的理论和观点,通过对纳米表面工程的研究内容、发展过程的研究,分析了纳米表面工程的出现带来的哲学思考和启迪。在人类理性归约之下,纳米表面工程必将实现其价值,促进社会进步,造福于人类。 相似文献
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表面工程和再制造工程的现状及展望 总被引:2,自引:0,他引:2
介绍了表面工程和再制造工程的概念、作用和国内外研究及应用现状,并对其今后的发展进行了展望.结合失效分析、失效预防和控制,阐述了表面工程和再制造工程在产品全寿命周期中的地位和作用,指出失效理论、失效分析是再制造的基础理论之一,表面工程技术和再制造工程技术是对零件进行失效预防和控制的关键手段. 相似文献
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Liwei Hui Qinmei Zhang Wei Deng Haitao Liu 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(26)
This Concept provides an overview of recent developments of DNA‐based nanofabrication and discusses its potential applications in the area of surface engineering. The first part of the paper discusses the strength and limitations of existing DNA‐based nanofabrication methods. The second part highlights several examples of surface engineering applications involving nano‐ and microscale surface textures. It finishes with a discussion of the opportunities and remaining challenges of applying DNA‐based nanofabrication in surface engineering applications. 相似文献
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现行各种开采地面沉陷预测方法均存在着一个共同的缺陷,均不能在集成以往开采地面沉陷工程实
例的基础上对某一地下采矿工程所引起的地面沉陷进行预测,而只能根据某种物理的或力学的方法对其进行预
测。人类在工程实践中所创造的开采地面沉陷方面的经验是非常宝贵的财富,应当在建立开采地面沉陷预测方
法时加以充分利用。以所收集的开采地面沉陷工程实例为基础现行各种开采地面沉陷预测方法均存在着一个共同的缺陷,均不能在集成以往开采地面沉陷工程实
例的基础上对某一地下采矿工程所引起的地面沉陷进行预测,而只能根据某种物理的或力学的 相似文献
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Lucchesi C Ferreira BM Duek EA Santos AR Joazeiro PP 《Journal of materials science. Materials in medicine》2008,19(2):635-643
The copolymers poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV) are being intensely studied as a tissue engineering
substrate. It is known that poly 3-hydroxybutyric acids (PHBs) and their copolymers are quite hydrophobic polyesters. Plasma-surface
modification is an effective and economical surface treatment technique for many materials and of growing interest in biomedical
engineering. In this study we investigate the advantages of oxygen and nitrogen plasma treatment to modify the PHBV surface
to enable the acceleration of Vero cell adhesion and proliferation. PHBV was dissolved in methylene chloride at room temperature.
The PHBV membranes were modified by oxygen or nitrogen-plasma treatments using a plasma generator. The membranes were sterilized
by UV irradiation for 30 min and placed in 96-well plates. Vero cells were seeded onto the membranes and their proliferation
onto the matrices was also determined by cytotoxicity and cell adhesion assay. After 2, 24, 48 and 120 h of incubation, growth
of fibroblasts on matrices was observed by scanning electron microscopy (SEM). The analyses of the membranes indicated that
the plasma treatment decreased the contact angle and increased the surface roughness; it also changed surface morphology,
and consequently, enhanced the hydrophilic behavior of PHBV polymers. SEM analysis of Vero cells adhered to PHBV treated by
plasma showed that the modified surface had allowed better cell attachment, spreading and growth than the untreated membrane.
This combination of surface treatment and polymer chemistry is a valuable guide to prepare an appropriate surface for tissue
engineering application. 相似文献
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J. F. Song T. V. Vorburger 《Journal of research of the National Institute of Standards and Technology》1991,96(3):271-289
In the quality control of engineering surfaces, we aim to understand and maintain a good relationship between the manufacturing process and surface function. This is achieved by controlling the surface texture. The control process involves: 1) learning the functional parameters and their control values through controlled experiments or through a long history of production and use; 2) maintaining high accuracy and reproducibility with measurements not only of roughness calibration specimens but also of real engineering parts. In this paper, the characteristics, utilizations, and limitations of different classes of precision roughness calibration specimens are described. A measuring procedure of engineering surfaces, based on the calibration procedure of roughness specimens at NIST, is proposed. This procedure involves utilization of check specimens with waveform, wavelength, and other roughness parameters similar to functioning engineering surfaces. These check specimens would be certified under standardized reference measuring conditions, or by a reference instrument, and could be used for overall checking of the measuring procedure and for maintaining accuracy and agreement in engineering surface measurement. The concept of “surface texture design” is also suggested, which involves designing the engineering surface texture, the manufacturing process, and the quality control procedure to meet the optimal functional needs. 相似文献
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Maeda H Maquet V Kasuga T Chen QZ Roether JA Boccaccini AR 《Journal of materials science. Materials in medicine》2007,18(12):2269-2273
Hydroxycarbonate apatite (HCA) coatings on the surface of bioresorbable materials for bone tissue engineering scaffolds were
produced using macroporous poly(DL-lactide) (PDLLA) foams impregnated by calcium carbonate in vaterite crystalline form. Stable
and homogeneous vaterite deposition on PDLLA foams was achieved using a slurry dipping technique. In vitro studies in simulated
body fluid (SBF) were performed to induce formation of (HCA) on the surface of vaterite/PDLLA composite foams. HCA was detected
after immersion of foams in SBF for 7 days. Hence, depositing vaterite on materials followed by immersion in SBF is confirmed
to induce HCA coatings on the surface of the material. The HCA coated, bioactive and resorbable PDLLA foams are intended for
use as bone tissue engineering scaffolds. 相似文献
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以氧化铝和氧化锆两种工程陶瓷在高效磨削条件下的磨削振动和表面波纹度为研究对象,概述了磨削表面波纹度的定义和评价方法以及产生波纹度的原因,在超高速平面磨削实验台上进行磨削工艺试验,通过改变砂轮线速度、进给速度和磨削深度,分析了磨削参数对零件表面波纹度的影响。在试验研究的基础上,对磨削表面波纹度的影响因素和机理进行分析和讨论。试验结果表明,在陶瓷材料高效平面磨削中,砂轮线速度和进给速度是影响磨削颤振与表面波纹度的主导因素。在如120 m/s的较高砂轮线速度时,磨削过程振动主要是由强迫振动引起,工件表面质量好于低速情况。在保证较高磨削效率的前提下,陶瓷材料的高效磨削更适合在大切深和小进给速度条件下进行。 相似文献