气相法二氧化硅应用机理及特性

主要介绍了气相法二氧化硅在液态体系、干燥体系、固态体系中的作用机理；气相法二氧化硅在应用中的特殊性能；以及比表面积、pH、含水量、添加量、表面处理程度等气相法二氧化硅各项物理性能对应用性能的影响。     

石油勘探开发行业可持续发展战略研究

从可持续发展的基本内涵出发，初步研究了石油勘探开发行业可持续发展的主要特征和指导原则，并提出了石油勘探开发行业可持续发展的若干主要对策。将可持续发展思想和战略逐渐融进石油工业业务活动中去，对我国石油工业的持续稳定发展具有十分重要的意义。     

铜浸出液的净化除铁研究

研究了氧化－中和沉淀法从铜浸出液中除铁的工艺条件，并介绍了工业实践。     

Silicon Nitride Derived from an Organometallic Polymeric Precursor: Preparation and Characterization

Partially crystalline Si₃N₄, with nanosized crystals and a specific surface area greater than 200 m²/g, is obtained by pyrolysis of a commercially available vinylic polysilane in a stream of anhydrous NH₃ to 1000°C. This polymer does not contain N initially. Crystallization to high-purity α-Si₃N₄ proceeds with additional heating above 1400°C under N₂. The changes in crystallinity, powder morphology, infrared spectra, and elemental compositions, for samples annealed from 1000° to 1600°C under N₂, are consistent with an amorphous-to-crystalline transformation. Although macroscopic consolidation and local densification occur at 1400°C, volatilization and accompanying weight loss limit bulk densification. The effect of temperature on specific surface area is examined and related to the sintering process. These results are applicable to pyrolysis, decomposition, and crystallization studies of ceramics synthesized by polymeric precursor routes.     

An improved light attenuation technique for measuring large interfacial areas

A laser-based light attenuation technique was successfully used to measure interfacial areas as high as 5832 m²/m³ and Sauter mean bubble diameter varying between 50 and 5600 μm. Good agreement between this approach and the photographic technique was obtained particularly at low gas holdups.     

Studies on high-performance blended/multiblended cements and their durability characteristics

Number of blends were prepared by intergrinding clinker, gypsum, fly ash, calcined clay, microsilica and limestone in laboratory ball mill in varying percentages, and their physical properties such as fineness, consistency, setting time and compressive strength have been determined. The durability tests on selected compositions were also conducted by exposing the mortar cubes separately in 5% Na₂SO₄ and 5% NaCl solutions till the age of 90 and 180 days. The performance was observed by compressive strength development criteria after various length of exposure. Results have been discussed and found that the durability of blended cement is higher than the ordinary Portland cement.     

High resolution XPS characterization of chemical functionalised MWCNTs and SWCNTs

High resolution XPS analysis of chemical functionalised multi-wall carbon nanotubes (MWCNTs) and single wall carbon nanotubes (SWCNT) was done with ESCA300 (overall instrument resolution of 0.35 eV). Information to the degree of functionalisation was ascertained by argon ion bombardment of the samples followed by XPS analysis to detect the functional groups, the percentage atomic concentration of various elements present and whether or not the detected functional groups imposed a chemical shift on the CNT atoms. The results show that true chemical functionalisation was achieved and by argon ion bombardment these functional groups can be altered relative to the C 1s carbon atoms of the CNT. The choice of chemicals used for functionalisation, the techniques employed and the types of nanotubes treated are important factors in chemical characterisation. The carbon atom on the nanotube ring to which the functional group (atom) is bonded, the chirality of the CNT, the electronegativity of the functional group, the bond type and whether the CNT is single-wall or multi-wall, or cut (short) could play a role in determining the chemical shift on the CNTs atoms. These investigations are relevant to chemical functionalisation of carbon nanotubes for various applications for example DNA sensors and other biomedical sensors.     

Surface Areas of Nitrated Hydrotalcites

Hydrotalcites in the nitrate form were prepared using microwave irradiation in the hydrotreatment step. The surface area (BET) of nitrated hydrotalcites was evaluated. Solids were characterized by atomic absorption, X-ray diffraction and BET analysis. Thermal pretreatment temperature determined the surface area of the hydrotalcites.     

电气石对好氧反硝化菌株反硝化特性的影响

用化学全分析、扫描电镜、Bruauer-Emmett-Teller法和粒度分析仪对内蒙赤峰电气石进行测试表征,研究了电气石对好氧反硝化菌株反硝化特性的影响.结果表明:电气石能够促进好氧反硝化菌株的生长繁殖,纯培养16 h后,细菌数量增加384%.电气石还可以增强好氧反硝化菌株的反硝化能力,与未投加电气石的相比较,NO-3-N,NO-2-N,化学需氧量的浓度降低,总氮去除率提高32.8%.电气石对菌液体系的氧化还原电位具有调控作用,可以使体系的氧化还原电位降低20%,这一作用可能是电气石提高好氧反硝化菌株反硝化能力的重要因素.     

Quantum DCS系统及其应用体会

中国联合水泥公司3000t／d熟料生产线电气控制系统采用了法国施耐德公司的Quantum DCS系统，实现对全厂所有设备的工艺操作和控制。全面介绍了QuantumDCS系统的特点、功能系统构成网络，并详细总结了确保该系统稳定可靠运行的使用和维护的经验。