废旧锂电池材料热解性能研究

废旧锂电池作为一种二次资源有着巨大的回收价值。运用热重分析手段,通过逐个对锂电池拆解物料进行差热分析,确定各类电池材料的高温破坏温度特性,并在此基础上开展了废旧锂电池的热解试验。结果表明,在400℃热解可获得良好的热解效果,黑粉回收率97%。     

夏昌世与《园冶》(修订稿)——重读《园林述要》和《岭南庭园》

作者认为《园林述要》是一部可以传世之作,堪称《园冶》“现代版续编”。它传承、发扬和发展了以《园冶》和计成、李渔等为代表的中国古典园林学理论和实践的精华。《岭南庭园》展示和剖析了作为私家园林范例的岭南庭园设计手法上的固有特征,有着长久的借鉴价值。     

Occurrence patterns of alien freshwater turtles in a large urban pond ‘Archipelago’ (Rome,Italy): Suggesting hypotheses on root causes

The patterns of the occurrence and distribution of alien freshwater turtle species in an urban pond archipelago (Rome, Italy) were analysed, with the aim of exploring the role of a set of factors (type of ponds, landscape context, size area, distance from the nearest road) with a generalized linear model approach. A total of 311 ponds subdivided in three types (fountains, small basins, lakes) embedded in different landscape contexts (public parks, private parks, urban areas) at differing distances from the nearest road were sampled. Six non‐native freshwater turtle species in 31 sites were recorded (9.97%). Lakes exhibited the highest occurrence rates of alien freshwater turtles, compared to small basins and fountains. Freshwater turtle species in urbanized areas were only observed in parks (both public and private). In both the public and private parks, the lakes exhibited the highest percentage of occupied sites, with fountains being the lowest. A direct and significant relationship was observed between pond size and species richness. The distance from the nearest road did not appear to affect species richness. A first interpretation of the data from this study facilitated the postulation of two a posteriori hypotheses that should be tested, as follows: (i) the causal process of turtle release is random, and the rate of extinction (and recapture) is higher in smaller ponds, thus producing the observed pattern; and (ii) the turtle release is not random, and people actively select the ponds they consider more suitable for their pet animals. In this study, it appears the lakes were perceived by those who abandon their pets as the most ecologically suitable habitats among other pond types to accommodate the different species of turtles. Knowledge of people's attitudes in regard to releasing pet animals also might assist managers of public green spaces to develop strategies aimed to preserve local biodiversity, and to educate the public about the conservation issue represented by the alien species.     

Torsional vibration analysis of lathe spindle system with unbalanced workpiece

For the purpose of analyzing the torsional vibration caused by the gravitational unbalance torque arisen in a spindle system when it is machining heavy work piece, a 10-DOF lumped parameter model was made for the machine tool spindle system with geared transmission. By using the elementary method and Runge-Kutta method in Matlab, the eigenvalue problem was solved and the pure torsional vibration responses were obtained and examined. The results show that the spindle system cannot operate in the desired constant rotating speed as far as the gravitational unbalance torque is engaged, so it may cause bad effect on machining accuracy. And the torsional vibration increases infinitely near the resonant frequencies, so the spindle system cannot operate normally during these spindle speed ranges.     

拉深简形件水平浮动切边模设计

拉深无凸缘筒形件，由于拉深后筒口边部凸凹不平。采用移动式凸轮，在水平十字形四个方向使凹模浮动与固定的凸模形成相对的剪切刃口，将多余的不平整的边部切掉。每浮动一次切开圆周长的四分之一多一点，共浮动四次。     

过盈配合联接条件分析

对配合件实际过盈量和测量过盈量等进行了分析 ,并以绞车为例验算能否满足过盈装配的要求。     

冲裁模重要工艺参数的确定与计算

冲裁模加工节能、低耗、高效、制品的成本较低。制品的尺寸公差由模具保证,具有“一模一样”的特征,产品的质量稳定。根据冲裁加工的特点,以保证冲裁尺寸和冲裁模寿命为目的,确定冲裁模的重要工艺参数。     

固定化酵母发酵产酒精载体选择的研究

以海藻酸钙和甘蔗块为载体固定酵母细胞,进行蔗汁和废糖蜜酒精发酵。结果表明,以甘蔗汁为发酵培养基时甘蔗块固定化酵母发酵液中平均残糖锤度(20℃)比海藻酸钙包埋酵母发酵低0.36,酒精平均体积分数比海藻酸钙包埋酵母发酵高0.20%;以废糖蜜为发酵培养基时甘蔗块固定化酵母发酵液中平均残糖锤度(20℃)比海藻酸钙包埋酵母发酵低0.43,酒精平均体积分数比海藻酸钙包埋酵母发酵高0.23%,显示出甘蔗块固定化法酵母发酵优于海藻酸钙包埋法固定化酵母。此外,甘蔗汁培养基与废糖蜜培养基对总体发酵效果的影响非常接近,但综合考虑甘蔗汁与废糖蜜的成本,废糖蜜是工业发酵生产乙醇用培养基的更优选择。     

含半埋藏井线双裂纹的Crl2合金钢试件电磁热止裂分析

应用ZL-2超强脉冲电流发生装置对带有预制双平行共线半埋藏裂纹的拉伸试件进行了脉冲放电止裂，放电后裂纹尖端熔化并形成高压应力区，使裂纹尖端钝化，达到了止裂的目的。采用数值模拟确定了止裂工艺参数，并确定了脉冲电流作用瞬间裂纹尖端的温度场和热应力场。研究结果表明：在合适的脉冲放电电压下，电磁热效应实现了空间半埋藏裂纹线形裂尖的钝化，并围绕两个共线裂纹尖端形成了热压应力场，同时实现了裂尖附近组织细化，可提高裂纹扩展的延展功，从而可减缓裂纹的扩展。     

BOPP生产线铸片锟的化学清洗

论述了 Ｂ Ｏ Ｐ Ｐ 生产线铸片锟结垢类型及形成原因，介绍了铸片锟化学清洗的工艺流程．实践证明，用化学清洗方法清除结垢是提高换热效率非常有效的方法