21世纪我国钾肥工业的发展与展望

概述了当前我国钾肥工业的发展现状及存在问题。21世纪我国钾肥工业将乘“西部大开发战略”之东风，在国家产业政策的支持下，通过加强宏观管理，增大投入，加大科研与综合利用，实现规模化，效益化，将取得重大进展，到2010年，国产钾肥可满足国内需求量的20％。     

轧辊的热膨胀对辊型的影响

本文以1300 mm热轧机为研究对象,对其生产过程辊形随温度的变化进行实测,分析研究轧辊的热膨胀对板形的影响.     

对井涌关井气体升移的探讨

对文献[1]、[2]中井涌关井后气柱在上升至井口过程中体积和压力不变的说法进行了分析，提出其中存在的问题，并利用相关理论进行了论证。指出，井涌（或井喷）关井后，气体在上升过程中，其压力和体积都是在不断变化的，甚至在深井中，井底不可能形成气柱，侵入井眼的气体以液态形式存在。     

Thermal Expansion Behavior of Amorphous Fe-Si-B Alloys

 To study the thermal expansion of amorphous Fe Si B alloys, the amorphous Fe78Si9B13 and Fe735Nb3 Cu1Si135B9 and their crystallized alloys were detected using thermal dilatometer. The results indicate that at the same temperature, the relative length change (ΔL/L0) values of the two Fe based amorphous alloys decrease with increasing heating rate, but those of their crystallized alloys show an opposite trend. It is concluded that the effect of heating rate on the ΔL/L0 of amorphous and crystallized alloys is related to free volume and defects, respectively.     

Molex原料煤油加氢装置扩容改造

介绍了金陵石化烷基苯厂的加氢－分子筛装置90kt/a扩容改造中，Molex原料煤油加氢装置的扩容改造开工情况。改造后的煤油加氢装置在低、高空速下运行状况良好，产出合格的精制煤油，实现了煤油加氢催化剂的国产化。     

浅淡固定式管板设计

本文提出在管板设计计算中有两个系数不被重视，然后具体介绍了这两个系数的含义，着重分析了控制系数大小的原因。     

Synthesis and high temperature XRD studies of tantalum nitride thin films prepared by reactive pulsed dc magnetron sputtering

In the present work, the growth characteristics of tantalum nitride (TaN) thin films prepared on (1 0 0) Si substrates by reactive pulsed DC magnetron sputtering are investigated. XRD analyses indicated the presence of α-Ta and β-Ta in the films deposited in pure argon atmosphere, while β-TaN and fcc-TaN phases appeared for 2 sccm of nitrogen, and cubic TaN for 5-25 sccm of nitrogen in the sputtering gas mixture of argon and nitrogen at a substrate temperature of 773 K. The TaN films obtained with increasing substrate temperature and pulse width showed a change in the texture from [1 1 1] to [2 0 0] orientation. Atomic force microscopy (AFM) results indicated that the average surface roughness was low for films deposited in pure argon than for the films deposited in a mixed Ar + N₂ atmosphere. Nanocrystalline phase of the deposited material was identified from the high-resolution transmission electron microscopy (HRTEM) images. X-ray photoelectron spectroscopy (XPS) core level spectra confirmed the formation of TaN phase. The high temperature X-ray diffraction analysis of the optimized TaN thin film was performed in the temperature range 298-1473 K. The lattice parameter of the TaN films was found to increase from 4.383 to 4.393 Å on increasing the temperature from 298 to 823 K and it reduced to 4.345 Å at 1473 K. The thermal expansion coefficient value was found to be negative for the TaN films.     

试论铝加工企业实验室建设

为了提高铝加工企业实验室管理水平和技术能力,使其成为铝合金材料及其深加工零件设计—研发—检验的重要平台,成为国内铝加工技术创新体系的重要组成部分,本文根据目前国内铝加工发展情况,按照铝合金材料及其深加工零件设计—研发—检验的特点,提出了铝加工企业实验室的建设原则、设计要求与运行、管理意见。     

Efficient stochastic structural analysis using Guyan reduction

This paper introduces the application of the Guyan reduction within the stochastic finite element (SFE) analysis, which employs a Galerkin-based Polynomial chaos (P-C) expansion formulation. It is shown that by reducing the size of the deterministic FE model, a substantial improvement in the overall computational efficiency can be achieved. An implementation exploiting the features of the proposed formulation is presented. In this regard, especially the interaction with the 3rd party FE solvers has been addressed. The suggested method has been tested on a simple grid structure and also on a large building model, where the accuracy and efficiency of the introduced approach have been quantified.     

End formation of a round tube into a square section having small corner radii

Expansion and reduction are the two common end forming processes for tubes. In the tube end expansion process using a square punch, it is difficult to obtain a small corner radii due to the stretching of the tube around the punch corners. The wall thickness around the corners is small when compared to the side wall. Hence, a tube having a poor square look is formed. In this study, a 2-stage end expansion of a round tube end into a square section having an improved square look i.e. small corner radii and increase in wall thickness around corners is developed. In the 1st stage, the tube end is flared into a cone shape using a 30° conical die by axial compression. In the 2nd stage, the conical end of the tube is drawn through a taper square die using a conical bottom square punch, and a near square section is formed. A 15% ironing ratio is applied during the drawing process to flatten the side wall of the square. Experimental and FEM simulation were performed to evaluate and to verify the forming process. Although the height of the square section increases when the punch stroke at the 1st stage is increased. However, this increase is limited by the buckling of the pipe at the circular section of the thick blank tube. Since the conical end is drawn into a square section having different radial lengths, the bottom of the square section is uneven. The uneven bottom end is trimmed off in the later process. A square section having a maximum height of 32 mm after trimming is successfully obtained from the experiment for the punch stroke, S = 44 mm using an API 5 L tube.