固体催化剂成型工艺的研究进展

介绍了常用的固体催化剂成型方法,包括挤条成型、喷雾成型、压片成型,转动成型等。探讨了成型过程对催化剂性能的影响,分析了这些成型方法的成型原理和实际应用。     

浅谈重型汽车用塑料制品成型工艺

介绍了几种重型汽车用塑料制品成型工艺,主要有注射成型、挤出成型、吹塑成型、压制成型、反应注射成型等成型工艺,重点介绍了在塑料制品成型中占很大比重的注射成型工艺。并举例说明重型汽车用大型塑料制品制备中的注意事项。     

微注射成型与微分注射成型技术

综述了国外微注射成型设备的发展历史,国内微注射成型设备的最新进展以及国内学者在微注射成型基础理论领域的研究进展,对现有微注射成型技术进行了系统地比较;提出了一种微型制品成型的新技术--微分注射成型技术,阐述了基于熔体泵的微分注射成型的成型机理,提出了一种利用常规注塑机进行微制品高效注射成型的实施方法。     

注塑成型技术进展

本文介绍了注射成型工艺的一些新进展,重点叙述了电磁动态塑化注射成型,气体辅助注射成型,微孔发泡注射成型,熔芯注射成型,高速低压注射成型技术的特点。     

粉煤成型技术研究进展

综述了国内外型煤技术研究现状,针对我国煤炭机械化开采过程中的粉煤利用难问题,提出了粉煤成型利用的必要性。总结了粉煤成型影响因素、型煤粘结剂及粉煤成型机理研究进展,研究表明:粉煤的性质、成型水分、煤料粒度、成型工艺、成型压力、粘结剂性质及添加量等对粉煤成型有很大影响;提出了粉煤无粘结剂成型过程假说和粉煤有粘结剂成型理论,为粉煤成型利用技术开发提供了理论基础。     

陶瓷基复合材料胶态成型工艺研究进展

重点介绍了几种主要陶瓷基复合材料胶态成型工艺,包括注浆成型、注射成型、凝胶注模成型、直接凝固注模成型、温度诱导絮凝成型、水解辅助固化成型、电泳浇注成型和溶胶-凝胶法成型.对上述工艺的原理、工艺过程及特点进行了比较,并提出了陶瓷成型工艺的关键问题.     

陶瓷现代成型技术的研究进展

分析了成型工艺在陶瓷制备中的重要作用和高质量的陶瓷坯体对成型工艺的基本要求，评述了国内外陶瓷现代成型技术，着重介绍了离心沉积成型、电泳沉积成型、离心注浆成型、注射成型、胶态成型和快速自动成型等新工艺，讨论了上述成型方法的基本原理和特点，指出了陶瓷成型技术的发展思路。     

民航用微孔塑料成型原理及方法

叙述了民航用微孔塑料成型的原理,并介绍了间歇成型、注射成型以及连续挤出成型的制备方法.并分析了各种方法的优缺点,指出连续挤出成型是最具有产业化优势的成型方法.     

塑料注射成型技术的最新进展

阐述了近年来塑料注射成型的一些新技术,包括微型注射成型技术、振动气体辅助成型技术、节能降耗注射成型技术、水辅注射成型技术、簿壁超高速注射成型技术等,并对注塑成型技术的发展前景进行了展望。     

注塑成型新技术的发展概况

综述了近年来注塑成型技术的发展状况,介绍了新型气辅注塑成型、多组分注塑成型、粉末注塑成型、微孔发泡注塑成型、微注塑成型等技术的特点及最新动向。     

A Review of Contemporary Views of Theories of Adhesion

The once distinct and independent theories of adhesion have been losing their isolation and converging. Ideas of the effects of surface roughness, once dismissed as irrelevant except in the case of textiles, have been revised; albeit on a smaller scale as details of surfaces have been revealed by sophisticated techniques. Electrostatic interactions across an interface have been more deeply explored and their significance recognised and expounded. Diffusion of groupings and chain segments within a polymer have been related to the possibilities of interaction with a variety of surfaces. Perhaps most important, theories of adsorption have been extended in depth. The precise nature of the molecular interactions have been recognised and quantified. In doing this the contribution of diffusion and elastoplastic phenomena have been integrated. These developments are collated and analysed to present the present understanding of the concepts.     

A Review of Contemporary Views of Theories of Adhesion

The once distinct and independent theories of adhesion have been losing their isolation and converging. Ideas of the effects of surface roughness, once dismissed as irrelevant except in the case of textiles, have been revised; albeit on a smaller scale as details of surfaces have been revealed by sophisticated techniques. Electrostatic interactions across an interface have been more deeply explored and their significance recognised and expounded. Diffusion of groupings and chain segments within a polymer have been related to the possibilities of interaction with a variety of surfaces. Perhaps most important, theories of adsorption have been extended in depth. The precise nature of the molecular interactions have been recognised and quantified. In doing this the contribution of diffusion and elastoplastic phenomena have been integrated. These developments are collated and analysed to present the present understanding of the concepts.     

Structural,mechanical, and gas barrier properties of poly(ethylene terephthalate) nanohybrid using nanotalc

Amorphous poly(ethylene terephthalate) (PET)/nanotalc nanohybrids have been prepared through solution casting route. The fine dispersion of nanotalc clay in the polymer matrix has been examined through transmission electron microscopy (TEM). The intercalation and interaction of nanoclay have further been confirmed using X-ray diffraction, ultraviolet, and Fourier transform infrared techniques. The thermal stability has been tested via thermogravimetric analysis and nanohybrids have been found thermally stable. The glass-transition temperature has been further confirmed through DTA and differential scanning calorimetry analysis which has been increased in the presence of nanotalc arising from greater interaction. The nanohybrids have been tested for their mechanical performances and have been found to have improved mechanical responses for nanotalc-filled nanohybrids. The modulus has been increased whereas toughness has been compromised meagerly. The modulus values have been theoretically predicted using various micromechanical models. The microhardness of the nanohybrids has been examined through Vicker hardness test. The theoretical prediction of the hardness values has been done using different micromechanical models. The structural development upon uniaxial stretching of the samples has been studied using small-angle X-ray scattering and wide-angle ray diffraction. The stretched samples have found to have short-range ordering as well as increased blob size and better coherency in the presence of nanotalc. The aspect ratio has been increased upon stretching. The inclusion of nanotalc has induced high barrier for gas permeation as compared to pure PET. The oxygen transmission rate has been found to decrease up to 64% for 8 wt % of filler concentration. The prediction of the permeability data has been done using different models considering different aspect ratios. The permeability values have been predicted very closely and nanohybrids have been found suitable for practical applications such as packaging. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 137, 48607.     

The Application of Biocatalysis in the Preparation and Resolution of Morita-Baylis-Hillman Adducts and Their Derivatives

The Morita-Baylis-Hillman (MBH) reaction affords highly functionalised allylic alcohols containing a new stereogenic centre. These MBH adducts are very versatile and have been transformed into a large range of products, some of which have medicinal potential. Several examples of asymmetric syntheses of MBH adducts have been reported, although a generally applicable method remains to be developed. Biocatalytic approaches for the synthesis and enzymatic kinetic resolution of MBH adducts have been reported, and are discussed in detail in this review. Enzymes able to catalyse the asymmetric MBH reaction have been identified, but selectivity and efficiency have generally been low. Lipases, esterases and nitrile-converting enzymes have all been successfully applied in the resolution of MBH adducts, with excellent selectivity being realised in most cases.     

INVITED REVIEW ABSORPTION OF NOX GASES

Oxidation of nitric oxide is an important step in NO_x absorption. Recent advances namely catalytic oxidation and the use of slrong oxidizing agents have been reviewed. The refinements which have been made in the kinetics of NO oxidation have been discussed. Several liquid phase absorbents have been suggested for the NO removal, particularly for the purpose of pollution abatement. Different models for NO oxidation using nitric acid have been analysed and the limitations of published information have been brought out.

Absorption of tetravalent nitrogen oxide (NO₂ and N₂O₄) has received considerable attention. The absorbents include water, nitric and sulfuric acids, sodium hydroxide, sodium sulfite and sodium chlorite. Absorption in water and nitric acid is important in the manufacture of nitric acid. The published information on the mechanism of NO₂ and N₂O₄ absorption in water has been critically analysed. The problem of nitrous acid decomposition has been analysed on the basis of film theory. The predictions agree favourably with the available experimental data.

A new mathematical model has been developed for a packed column. Performance charts have been prepared which take into account the effects of concentration of nitric acid, superficial liquid velocity, temperature and the partial pressures of various components. A simplified model on the basis of NO oxidation has also been presented.

Various process design aspects have been discussed in detail. Optimum values for various operating parameters exist and basis for their selection has been explained. Some engineering aspects such as the selection of equipment and material of construction have also been discussed. A comparison between semi-batch and continuous modes of operation has been presented. The problem of the manufacture of pure nitrites has been analysed

Specific recommendations have been made regarding the use of equations and procedures in design. The knowledge gaps have been clearly brought out and suggestions have been made for future work     

水处理除盐系统出力不足的原因分析及处理措施

针对郑州热电厂五期补给水处理一级除盐系统酸碱耗大、自用水率高、出力严重不足等问题，对现场进行了调查研究，分析了主要原因，并提出了相应的处理措施，最终使问题得以解决。     

酞菁类光敏染料的研究进展

酞菁类光敏染料具有低成本、化学性质稳定、对环境友好等优势,越来越受到人们的重视,近年来已成为研究的热点。研究人员现已对许多种酞菁类光敏染料进行了大量研究,数千种不同分子结构的该类型化合物已被合成,研究表明在取代基的作用下,与不同的金属络合所表现出的性能、特征各不相同,从而得出了一些能有效改善酞菁光谱吸收特性和提高光电转...     

微乳液特性及在纳米材料制备中的应用

本文主要介绍了W／O相微乳液的组成、内部结构等特性，并简要分析了其制粉原理及影响因素。并对其在纳米材料制备领域中的应用进行了评述，对其今后的研究方向作了简要推测。     

Laser Machining and Functional Applications of Glass‐Ceramic Materials

In this work a study of glass‐ceramic laser machining and some functional applications are presented. Firstly, both the effect produced by the machining method as well as how the modification of the reference position influence the machining results have been studied. Secondly, blind holes and special shape cross‐section blind holes have been created for functional purposes. A Q‐switched Nd:YAG laser at its fundamental wavelength of 1064 nm with pulse‐widths in the nanosecond range has been used. Morphology, depth, and volume obtained by machining grooves have been studied. The variation in the ablation yield when the position of the surface to be machined is modified has also been studied. The composition and microstructure of the machined areas have been described and discussed and thermal tests have been performed to check if the objectives of the functional applications have been achieved.     

A function of external doping: Characteristics of inorganic nanostructure based diode

The present study has been related to synthesis and characterization of ZnO films growth by chemical spray pyrolysis technique. Variation in the characteristics of ZnO film has been evaluated as a function of Cobalt content. The influence of cobalt content on structural, morphological, optical and electrical features have been observed by XRD, SEM, AFM, UV–vis spectroscopy and I-V measurement, respectively. Structural measurements of the samples indicate that all samples have polycrystalline nature with (002) preferential orientation. SEM and AFM images have indicated that films have smooth and uniform morphology. Changes in the surface morphology of the samples have been explained by taking Cobalt incorporation into consideration. Optical studies reveal that the band gap values of the samples exhibit decreasing tendency with Cobalt content. Performance of ZnO films in Schottky diode application has been conducted by evaporation Au contact on ZnO:Co films. From I-V curves of the devices, it has been observed that all devices exhibit good rectifying properties. Also, some diode parameters such as ideality factor, barrier height have been calculated by considering thermionic emission theory (TE) and have been found in the range of 1.89–1.57 and 0.57–0.62 eV, respectively. Additionally, these results and series resistance values of the diodes have been checked and calculated by using Cheung's function. Results showed that all diode parameters highly depended on cobalt concentration. All results have been discussed in detail depending on cobalt incorporation.