细炻砖铜锈缺陷研究

细炻砖作为仿古砖的一个重要组成部分一直在家庭装修中被广泛应用。在细炻砖的生产过程中,铜锈在浅色版面中容易显露出来,占总缺陷的比例比较大,也降低了产品的品质。本文用XRF对原材料和坯体配方进行了定性分析,用SEM对铜锈进行了表面形貌分析,用EDS对铜锈进行了元素分析。结果表明,铜锈主要是原料中的有色金属杂质引起。通过加强浆料的过筛,降低浆料的细度可以有效减少铜锈的产生。     

Effects of deformation rate on properties of Nd,Y-codoped CaF2 transparent ceramics

Different deformation rates of Nd,Y-codoped CaF₂ transparent ceramics were prepared by ceramization of single crystals. The deformation rate effects on the crystallization behaviors, microstructures, mechanical properties, and optical performances were investigated for the first time. The results indicate that the comprehensive performances of Nd,Y-codoped CaF₂ ceramic (△a?=?62%) are the most optimal compared with other ceramics having different deformation rates (△a?=?34%, 40%, 50%, and 75%). In further investigations of the optical properties, the Nd,Y-codoped CaF₂ ceramic (△a?=?62%) sample exhibited a high transparency (T_a?>?91%, 3-mm thick，250?～?1200?nm), low light scattering, superior fracture toughness (K_1c?～?0.71?MPa·m^1/2), strong fluorescence emission, long lifetime (τ?=?348.72?μs), and broad FWHM (29.2?nm), promising a good candidate for high-power laser material.     

An investigation on the recycling of hydrated cement from concrete demolition waste

Construction and demolition waste (CDW) recycling is generally limited to the use of the coarser fraction as aggregate for new concrete. The recovery of fine aggregates requires a cleaning by removing the hydrated cement waste (HCW). In this paper, the possibility to use HCW extracted from CDW as alternative component for the production of new clinker is explored.A pure HCW sample was prepared and used in partial replacement of natural materials in raw admixtures for new clinker production. At a replacement degree of 30%, a new Portland clinker containing almost 50% of C₃S could be produced with a huge spare in the release of CO₂ (about 1/3 less). At higher HCW dosage a non-Portland clinker containing almost 80% of C₂S has been obtained: its use as supplementary cementing material in blended cements revealed satisfying long term performances.     

精细注水配套工艺技术优化研究

本文通过对注水配套工艺的优化研究,有效提高奈曼油田分注率和配注合格率,提高精细注水开发效果。     

Physical properties and microstructures of residual carbon and slag particles present in fine slag from entrained-flow coal gasification

Fine slag (FS) consists of residual carbon (RC) and slag particles (SP). This paper studies the characteristics of SP and RC separately. SP contain a little of pores and mainly consist of spherical particles most of which are solids. RC have a higher pore surface, more continuous and complete pore structure. The chemical structure of inorganic minerals in SP has the following characteristics: According to nuclear magnetic resonance results, the amounts of network structure Q₄ and Q₃ are more than that of chain structure Q₂ and Q₁. The 4-coordinated aluminum consists of 74% and the octahedral coordination (Al(VI)) takes up only 11%. SP is a heterogeneous material which contain not only inorganic minerals but also organic carbon. C atom associated in chemical way with the inorganic matter within SP matrix. The predominant groups of organic carbon within SP matrix are C-C and C-O. C-O groups organically bound with inorganic elements in SP forming C-O-M (M: inorganic elements) bands. The predominant components in RC are C-C and C-O.     

GPS技术下的露天矿山爆破设计及布孔

针对某露天铁矿布孔方式及弊端，该矿山引进GPS技术并将其应用到矿山爆破设计和布孔中，在现场进行实验研究。结果表明，使用了GPS技术进行布孔，可以极大地提高孔位的布设精度，且操作简便，工作效率较之前也有较大的提高，满足了矿山精细化爆破要求，使得最终的爆破效果得到改善。据现场统计，最终爆破大块率降低40%，减少了处理大块等待时间，满足露天矿山采装的要求，获得了良好的经济效益。     

化工原理课教学方式的改革与探索

为调动学生自主学习兴趣,培养其解决工程实际问题的能力和创新能力,我们对化工原理课程(理论课、实验课和课程设计)的授课方式等进行了改进,即在教师的配备、教学内容及时间的设置上,进行了改进,并提出了改进的具体措施,取得了成效。     

高师化学专业有机化学实验课程的改革与探索

文章从高中化学实验的教学目标、教学内容和教学模式三方面入手,通过对12所高中化学教师的调研,分析了高中化学实验与高师化学专业有机化学实验课程的教学现状。结合高中化学课程标准(实验),提出了对高师化学专业有机化学实验教学目标、教学内容和教学模式改革的具体措施。     

精细化学品化学教学中的几点体会

探讨了精细化学品化学课程从教七年来,在课堂教学内容的选择与重组、教学方式探索与实践中的几点心得体会。教学内容既要与现代生活、社会科技发展相适应,又要层次分明、条理清楚,让学生们易于理解和掌握。教学方式上采用多种教学方式,如多媒体教学、案例式教学等,以激发学生们的学习兴趣和热情,同时注重理论教学与实践教学的结合,让学生们学以致用。     

聚合物合成工艺学-教学浅谈

《高聚物合成工艺学》是工科材料化学专业重要的专业课程。根据聚合物合成工艺学的课程特点,结合课堂教学的经验,作者从学生知识体系的构建、知识的运用以及教学内容、教学方法阐述了教学体会,制定出了更加适合学生学习的教学方法和考核方式,以求在传授知识的同时,努力提高该课程的教学质量,激发学生的学习兴趣,培养学生综合运用知识的能力。