2690mm轧机机架辊改造

机架辊是2 690 mm轧机设备中的重要部分,主要作用是为了可靠输送轧件,顺利实现咬钢和抛钢。由于机架辊离工作辊很近,承受的复合型冲击负荷大,作业中容易被损坏,对此,本文重点介绍新钢中板线2 690 mm轧机机架辊的改造内容。     

3毫米波段缝隙阵天线的热电一体化设计研究

在3毫米波段雷达导引头系统中,收发组件与波导缝隙阵天线集成装配,其工作过程会使天线温度上升,从而导致天线性能恶化. 为了使天线在不同温度下均保持最佳性能,提出一种基于电磁与热一体化的设计方法. 通过对天线样机在典型工作温度下的仿真分析与实验验证,证明了此设计方法的有效性和可行性.     

利用弹头变形识别枪击5mm钢化玻璃时序的研究

选用54式手枪、77式手枪和QSZ92式9mm手枪,分别垂直射击5mm钢化玻璃,分析弹头在贯穿玻璃后的变形和玻璃平面的痕迹特征。通过实验研究,统计并分析相关数据,得出了首发弹和非首发弹形成的弹孔痕迹以及弹头的平面痕迹特征的区别,根据弹头变形识别枪击钢化玻璃的时序。由于各种枪支不同的性能,比较多种弹头的痕迹特征,找出影响弹头痕迹特征的主要因素。     

基于物体特征有效提取和离散点三维重建的3D扫描系统原型研究

针对3D扫描技术的近期发展情况,以及市场关于被摄物体特征有效提取的迫切需求,通过系统的对照相机和投影仪测量的方法与计算,利用离散点三维重建算法、标准化算法详细分析了,作为3D扫描原型系统的关键技术,并深入的对三维坐标重复演算的过程,进行了实践研究与计算,论证了基于投影光编码技术的3D扫描仪原型系统,在物体特征有效提取和离散点三维重建中完全可以高效应用;同时,使用焦距标准化运算、逆向倾角变形运算、逆向扭曲变形运算三种方法,综合论述了物体特征有效提取和离散点三维重建过程的相关内容,测试了原型系统对真实文物的扫描情况,展开了该原型系统可应用于不同材料,不同种类物体的扫描,并能有效的进行数字化物体特征识别的研究结论。     

φ7管风冷冷凝器翅片密度对整机性能影响的实验研究

通过实验,测试两器均采用φ7管径换热管的风冷冷风型单元机在不同冷凝器翅片密度情况下整机的制冷量及能效比值。根据实验测试数据,可直观评估冷凝器翅片密度的调整对整机性能的影响程度,为使用φ7管换热器的机型的全面开发提供重要的参数依据。     

Hot-rolled strips of up to 19 mm in thickness and their processing to helically welded large diameter pipes of grade X80

Hot-rolled wide strip for production of large diameter,heavy gauged(up to 19 mm) helical line pipe grade X80 was a priority development over the last three years.Microstructure,texture and mechanical properties of strips have been characterised.Also the welding conditions have been simulated.The favourable microstructure is achieved by the proper selection of an appropriate chemical composition of low carbon content and increased niobium micro alloying in combination with suitable strictly controlled hot-rolling parameters.The addition of niobium in combination with the adjustment of other alloying elements increases the recrystallisation stop temperature and thus makes it possible to apply a high temperature processing(HTP) concept.The homogeneous bainitic microstructure across the strip gauge is then formed during accelerated cooling on the run-out table of the hot-rolling mill.All results indicated excellent properties of these hot strips which make it suitable for spiral pipes of grade X80 for example 18.9mm×Φ1 220 mm at dimension.     

Effect of Tempered Temperature on Microstructure and Properties of 150mm 610MPa Grade Ultra-Heavy Plates

The 150mm 610MPa grade ultra-heavy plates was successfully exploited with 320mm casting slab,and the microstructure and mechanical properties was studied under different tempered temperature.The plasticity and toughness are improved obviously in the 1/4 and 1/2 of 150mm ultra-heavy plates by controlling the amount and distributing pattern of ferrite,and the produced plates are successfully used in the construction of hydropower station of Murum in Malaysia.     

影响0.006mm铝箔质量因素的探讨

分析了我国当前高精铝箔的生产状况，对影响０．００６ｍｍ铝箔生产和质量的主要因素－装备水平，坯料状况，工艺条件和企业的管理水平进行了探讨。     

庄海8Ng-H3K井开窗侧钻大位移水平井钻完井技术

庄海8Ng-H3井水平段筛管统一开采,目前处于高含水期,在其井眼内开窗侧钻庄海8Ng-H3K大位移水平井,以继续开发馆陶油藏。介绍了该井在244.5 mm套管内开窗侧钻技术,施工中应用了斜向器开窗和旋转导向、随钻测井及随钻测量等配套技术;借鉴庄海8Ng-H3井经验,采用了变密度筛管完井控制底水的分段开采技术。该井投产后日产油25 t,含水6.3%,与邻井相比控水效果明显。该井的成功经验可为同类井施工提供借鉴。     

Sickle bush (Dichrostachys cinerea L.) field performance and physical–chemical property assessment for energy purposes

The sickle bush (Dichrostachys cinerea (L.) Wight & Arn.) comprises a woody legume shrub which is widely distributed throughout of the tropical areas of Africa, Asia and Oceania, being found as well in Cuba where it represents a difficult to control invasive plant. It holds great silvopasture and energy crop potentials. In southwestern Spain a two year field trial was conducted contemplating also another six hardwood taxa commonly used as energy crops. The sickle bush above ground dry biomass fraction was 60.4%; sickle bush displayed a high transpiration rate during hot days (3.02 kg m⁻² d⁻¹ to 6.82 kg m⁻² d⁻¹); cold winter temperatures (<−2 °C) together with hot and dry summer air (<20% relative humidity) committed survival and growth. The physical-chemical wood properties and the pellets thereof derived were analyzed and compared to those of the other energy crop taxa. The within other woody species normal chemical composition range coupled to a high wood density and energetic use properties (19.2 MJ kg⁻¹ higher heating value, 29 g kg⁻¹ ash content) all allow for an industrial use. Pellets evidenced also good physical and mechanical properties (690 kg m⁻³ bulk density, 42 g kg⁻¹ moisture content). However, the mechanical durability (93.9%) was slightly less than that required by the non-industrial use standards, therefore further improvements should be studied. All of the above could encourage scrubland cuts in Cuba as a mechanical control method, in addition to the expansion of plantations within of their tropical climate based natural habitats.