螺旋状匹配搜索的块拼贴纹理合成

基于样图的纹理合成方法是继纹理映射、过程纹理合成等方法后发展起来的一种纹理拼贴方法。该文在Efros块拼贴算法和徐晓刚的螺旋状点匹配搜索算法基础上,提出了一种螺旋状匹配搜索的块拼贴算法。该算法利用纹理块的连惯性,在搜索待合成纹理块时,在已合成纹理块在样本图像中位置的邻域进行搜索,找到匹配纹理块后进行输出。该方法大大加快了纹理合成的速度,与Efros块拼贴算法相比,在合成质量不变的基础上,合成速度平均提高了10倍。对于不同的纹理进行实验,其结果也令人满意。     

聚合釜密闭加料问题的探讨

改传统的开入孔加料为密闭加料，减少了氯乙烯的排放，节省了置换用氮气，从而降低成本、改善环境、增加效益。对密闭加料存在的一些问题提出了解决办法。如能采用此法，每年可节约资金360多万元，效益可观。     

Mechanism and control of water seepage of vertical feeding borehole for solid materials in backfilling coal mining

To solve the problem of water seepage of vertical feeding borehole for solid materials, we established the fluid-solid coupling dynamic model of groundwater flowing in rock mass adjacent to the vertical feeding borehole. Combining with the engineering geological conditions, we built a numeral model to study the influence rule of the aquifer hydraulic pressure and seepage location of feeding borehole on the amount of seepage with finite element numerical method. The results show that the nonlinear relationship is presented among the amount of seepage, the seepage location and aquifer hydraulic pressure. The higher the aquifer hydraulic pressure is, the closer the distance between seepage location and aquifer is, and the faster the harmful levels of aquifer will grow. In practice, we calculated the allowable seepage of feeding borehole by the optimum moisture content and natural moisture content of backfilling materials, and then determined the protection zone of feeding borehole, so the moisture content of backfilling materials can be controlled within the scope of optimum moisture content.     

MODIFICATION OF GEOMETRY AND TECHNOLOGY OF CYLINDRICAL WORMS

The objective of this research is to develop a new method of grinding process that can efficiently make concave profile of the worm thread smooth. The grinding is carried out using a wheel with curvature profile in the axial plane in the form of an arc of logarithmic spiral. The proposed method will provide maximum line of contact between the tool and the worm with minimum stress concentration at any point. The generating equation of the grinding tool profile and its arrangement with respect to the worm during thread grinding were determined.     

现代化小型冷床上料装置结构设计分析及计算

近年来，由于轧钢工艺趋向于采用无扭轧制等先进技术，使轧制速度迅速提高，对冷床高速上料装置提出了更高的要求。冷床高速上料装置是冷床设计中的难点，也是关键设备，它的设计质量与安装精度直接决定着产品的最终质量。本文对冷床高速上料装置进行了结构分析与计算，对冷床的设计、维护有一定的指导意义。     

Ø2200×18000精矿干燥窑的改造与设计

就某特大型有色冶炼企业在ISP技改工程中,将该企业湿法炼锌工艺中的闲置设备φ2200×14000浸出渣干燥窑重新设计改造成工程所需的φ2200×18000精矿干燥窑进行了阐述.文中对筒体的设计、传动功率的校核以及新型结构的扬料板的设计进行充分的论证,改造后的φ2200×18000精矿干燥窑经安装、调试后顺利投入生产使用.     

Simulation of Artificial Grain Feeding in Order to Reach Dynamical Bed Stabilisation Along the River Rhine

The Wesel-Xanten stretch of the fiver Rhine between km-812.5 and km-821.5 is one of the reaches where strong erosion leads to high maintenance efforts conceming navigability.In order to improve the naviga- tion conditions without aggravating the flood protection,but also ensuring that the ecological system of the river is not damaged,investigations of the morphodynamical processes in connection with artificial grain feeding ac- tivities have to be carried out by Federal Waterways Engineering and Research Institute.The performance of artificial grain feeding along a stretch of the lower Rhine near Wesel to prevent bed erosion by balancing sedi- ment transport was simulated in a scientific way by sensitivity studies in a 2D depth-average numerical model with graded sediment transport approach.The target of the investigations is to study the interaction of bed load supply and hydro-/morphodynamical features,and then especially to analyse and control the grain feeding measures in this section of the Rhine river.First the administrative background and target of artificial grain feeding along the waterways and then the special features regarding flow and transport characteristics of the stretch are described.After introducing shortly the mathematical basis for modelling graded sediment transport and some special treatments for the case of artificial grain feeding activities,some validation results for graded sediment are discussed.A series of numerical simulations with the objective of testing the model sensitivity to different model parameters has been carried out.Further,results of numerical simulations for the case of grain feeding are presented.     

Reach and posture hand preferences during arboreal feeding in sifakas (Propithecus sp.): A test of the postural origins theory of behavioral lateralization.

Sixteen sifakas (11 Propithecus verreauxi coquereli, 2 Propithecus verreauxi verreauxi form majori, and 3 Propithecus tattersalli) were videotaped as they fed on leaves in an arboreal context. The hand used to feed and the hand used to maintain postural stability was coded. For each subject, the lateral bias of the hand used to feed was opposite the hand used in postural support. Seven sifakas displayed no bias for feeding or posture-related hand use, 7 sifakas displayed significant feeding-related reach preferences for pulling branches to the mouth (5 left- and 2 right-hand preferences), and 9 sifakas exhibited significant hand preferences for postural support (2 left-, 7 right-hand preferent). Although these data do not strongly support the postural origins theory of behavioral lateralization, the modal preference pattern for sifakas that displayed significant hand preferences for posture and feeding involve a left bias for feeding and a right bias for postural support. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

黄金珠粒振动给料工位预测控制设计

本文通过对黄金自动配重系统中珠粒振动给料工位的研究，实现了振动给料过程的数学模型、特点分析，基于理想模型的预测控制策略的提出、设计和算法实现，以及实验数据、仿真数据的对比分析，系统达到了用户的预期要求，配重过程快速、稳定、可靠，配重结果计量准确、精度高。该系统的研制完成，极大的降低了工人的劳动强度，提高企业的生产效率，为企业实现生产过程的全面自动化、信息化奠定良好的基础。     

伺服系统在轴承磨床上的应用

中介绍了伺服系统在轴承磨床上的应用、原理、结构、优点，以及在轴承磨床使用中所能达到的精度、应用前景。