On-line control of processing atmospheres for proper sintering of oxidation-sensitive PM steels

Changes of atmosphere composition during sintering of water atomized powder prealloyed with Mn and Cr (up to 2% of both) were studied. Increasing sensitivity to atmosphere purity with increasing alloying elements content was registered. Continuous monitoring of sintering atmosphere composition (CO/CO₂/H₂O) indicates three critical stages during the heating up to final sintering temperature: the importance of rapid atmosphere purification after lubricant decomposition and removal; the reduction of the iron oxide layer by hydrogen at temperatures up to ∼500 °C and by carbon at temperatures around ∼720 °C; the reduction of the spinel oxides on the powder surface at above 900 °C and further reduction of thermodynamically stable surface oxides and mixed internal oxides close to the sintering temperature. The measured ratio of CO/CO₂ indicates favorable thermodynamic conditions for reduction of stable oxides as (Cr,Mn)_xO_y close to sintering temperature (1120 °C) for the applied sintering conditions. The experimental results were confirmed by modeling the metal-gas interactions using the thermodynamic/thermochemical softwares ThermoCalc and HSC Chemistry. The modeling indicates the significance of maintaining a sintering atmosphere with high reducing potential during heating stage for minimizing oxidation before high-temperature carbothermal reduction starts.     

Effect of carbonization atmosphere on the structure changes of PAN carbon membranes

PAN carbon membranes were prepared by carbonizing the initial PAN membranes in vacuum and Ar at different temperatures. FTIR, Raman and XRD were applied to study the influence of carbonization atmosphere on the structure changes of PAN carbon membranes. The variations in adsorption peaks of FTIR, the intensity, position and FWHM of the Raman peaks, and microcrystallite parameters from XRD (e.g., d₀₀₂, Lc and La) are correlated with the structure change of PAN carbon membranes. Analyses results reveal that vacuum atmosphere can produce PAN carbon membranes with higher order degree than those in Ar atmosphere, although the structures of PAN carbon membranes prepared in the two atmospheres are both amorphous. In addition, vacuum atmosphere can significantly accelerate the degradation reaction of PAN membranes and favors the preparation of carbon membranes with smaller pore size.     

Reconstruction of cloud geometry from multi-view satellite images

Reflected solar radiances measured by the pushbroom cameras of the Multiangle Imaging SpectroRadiometer (MISR) on the Terra satellite at nine viewing angles are combined to give eight stereo pairs. These are analyzed with stereo-photogrammetric methods to measure the geometry of a convective cloud system. Both cloud-top heights and cloud sides are retrieved with a precision of about 200-300 m. Two case studies of deep, convective clouds over ocean are considered. The accuracy of the MISR retrieval is tested in the first case study by reference to coincident, higher resolution stereo data from ASTER, showing how the accuracy of the cloud-top height retrieval is improved using the oblique MISR views. In the second case study, the entire cross-section of the cloud aligned with the viewing azimuthal direction is measured, using all nine cameras. The methodology presented is an important step towards more routine retrievals of the 3D geometrical reconstruction of isolated, deep-convective clouds. Such reconstructions are a necessary prerequisite to the subsequent 3D radiative transfer modeling used to aid the remote sensing of the elusive microphysical properties of such clouds.     

履行党管人才责任推动企业持续发展

企业党委必须始终把加快人才队伍建设作为兴企、强企的首要任务,切实履行党管人才的责任。要通过抓规划,铺路子,畅通人才成长通道;抓协调,搭台子,创造人才成长环境;抓重点,压担子,加快人才成长步伐;抓典型,树旗子,营造人才成长氛围来统筹推进各类人才队伍建设。     

基于决策二叉树的多类支持向量机在大气质量评定中的应用

经典的支持向量机(Support Vector Machine，简称SVM)是针对二类分类的，在解决大气质量等级这种典型的多类分类问题时存在困难，本文提出了基于决策二叉树支持向量机的大气质量分类算法，将分类器分布在各个结点上，从而构成了多类支持向量机，减少了分类器数量和重复训练样本的数量。实验结果表明该方法能够正确地对大气质量进行识别。     

旅游区入口环境的塑造--韶山门设计竞赛感言

在湖南省韶山市“韶山门”全国设计竞赛中,我们的设计主题围绕着韶山的人文背景和自然风光展开,以历史为主线,以自然景观为依托,在凝重的韶山风景画卷中跃然而出,雄伟壮丽,简洁大气.     

连续生产线上更换瓶罐生产品种的经验

综述了在连续生产线上更换瓶罐生产品种涉及的窑炉、换料操作以及料道调节等方面的问题,列举了若干实例。     

大气环境仿真中数据模型及数据库的设计与实现

大气环境对飞行器有着至关重要的影响,不仅影响着飞行器本身的飞行和作战性能,而且也影响着飞行器操纵人员的决策.所以,大气环境仿真是高逼真度飞行仿真器设计的一个的重要组成部分.该文基于数据场的概念建立了大气环境数据模型,然后根据这个大气环境数据模型设计了一个具有四叉树结构的大气环境数据库,很好地解决了多分辨率的问题.最后将大气环境数据库映射到SEDRIS表示.     

磷酸铁锂烧结设备—全纤维材料气氛双推板窑的研制

介绍了一种新型的磷酸铁锂烧结设备的主要结构,其全纤维的炉膛结构克服了现有设备的缺点,具有节能、方便维护等特点。     

中国古典园林理水的现代启思

中国古典园林理水有着丰富的文化内涵和独特的构思手法,它所塑造的如诗如画的水环境,让世人叹为观止.从介绍中国古典园林理水的历史入手,分析其理水手法、文化意境的塑造,并结合创作实践,阐述中国古典园林理水的继承和发展问题,以期探索既符合当代可持续发展观念,又具有中国传统文化底蕴的水环境设计手法.