Comparison of the Effect of a Hydrocarbon Oil and a Terpene Tackifier on the Autohesion of Styrene-Butadiene Rubber

Blends of uncrosslinked styrene-butadiene rubber (SBR) with a terpene tackifier resin or a naphthenic oil have been characterized, and their autohesion and cohesion determined using a T-peel geometry. SBR/oil blends are homogeneous at all proportions, while SBR/resin blends, based on DSC and DMA analysis, undergo bulk phase separation at about 50% resin. However, migration of tackifier to the surface region is proposed at much lower resin contents. Compositions diluted with oil have autohesion similar to the neat SBR. This is attributed to compensating effects; although oil hastens self-bond formation by increasing chain mobility, this is nearly equally balanced by more facile chain separation during bond rupture. In short, oil-diluted compositions are soft and weak. On the other hand, SBR compositions containing small amounts of resin have high autohesion. Resin-diluted specimens deform easily at low strain, just as those containing oil, but intertwined chains of the former have greater resistance to separation, due at least in part to higher glass transition temperatures. It is proposed that autohesion is further enhanced by migration of tackifier to the surface. This causes SBR/resin compositions to be both soft and strong-a necessary condition for high autohesion.     

T406型脱氯剂的研制与工业应用

报导了型脱氯剂的研制、性能试验和工厂运行结果。与国内外常见同类脱氯剂的对比试验及工业应用表明, 由化工部西北化工研究院开发研制的这一新型脱氯剂具有抗压碎强度高, 净化度高, 氯容量高的特点, 可以在常温下用于气相和液相原料中氯化物的脱除。即使在低温（4℃）下, 净化后原料中氯降至左右的情况下抓容量仍高达18％以上。该脱氯剂还能同时脱除原料中的硫。T406型脱氯剂已工业应用于混合二甲苯和氢原料的脱氯, 使用效果良好。     

德士古气化炉的提温操作

通过更换煤种使生产消耗得到了大幅度降低，生产能力得到了较大的提高，但渣中可燃物较设计指标提高了2－3倍，为此进行了提高炉温的试验，考察渣中可燃物随炉温的变化关系，则时考核不同渣中可燃物含量下的氧耗和煤耗。     

Greedy-search-based multi-objective genetic algorithm for emergency logistics scheduling

To enable the immediate and efficient dispatch of relief to victims of disaster, this study proposes a greedy-search-based, multi-objective, genetic algorithm capable of regulating the distribution of available resources and automatically generating a variety of feasible emergency logistics schedules for decision-makers. The proposed algorithm dynamically adjusts distribution schedules from various supply points according to the requirements at demand points in order to minimize unsatisfied demand for resources, time to delivery, and transportation costs. The proposed algorithm was applied to the case of the Chi–Chi earthquake in Taiwan to verify its performance. Simulation results demonstrate that under conditions of a limited/unlimited number of available vehicles, the proposed algorithm outperforms the MOGA and standard greedy algorithm in ‘time to delivery’ by an average of 63.57% and 46.15%, respectively, based on 10,000 iterations.     

基于新型混合模型的欠定盲分离方法

针对欠定盲分离问题,提出了一种新的源恢复方法. 在时频域局部区域采用复高斯分布对源信号进行建模,将语音信号的稀疏性和局部平稳性结合在一起,提出了一种新的混合模型来描述观测信号在局部区域的概率分布.通过该模型,将每个时频点的源信号状态的判断问题转换成模型的参数估计和后验概率的计算问题,最后通过子混合矩阵的逆恢复出源信号. 实验结果表明,该方法具有很快的收敛速度,并且比已有方法具有更好的分离性能.     

PET熔体输送系统中熔体温度自动控制方案

在热媒温度控制系统中以熔体温度作为主参数,组成串极调节系统。投入运行后,熔体温度稳定,调节阀动作平稳,效果良好。     

6m大容积焦炉烘炉实践与体会

介绍了 6 m大容积焦炉由冷态到转入正常加热温度的烘炉操作过程中 ,按照一定的升温曲线 ,通过对焦炉热工和炉体膨胀的科学管理 ,确保新建焦炉顺利由冷态过渡到生产状态。     

Sm~（3＋），Eu~（3＋），Tb~（3＋）等离子在低熔点玻璃中的光谱性质及

Ｓｍ￣（３＋），Ｅｕ￣（３＋），Ｔｂ￣（３＋）等离子在低熔点玻璃中的光谱性质及可见荧光的研究姜妍彦，王承遇，王继红（大连轻工业学院１１６００１）ＳｔｕｄｙｏｎＳｐｅｃｔｒａＰｒｏｐｅｒｔｉｅｓａｎｄＶｉｓｉｂｌｅＦｌｕｏｒｅｓｃｅｎｃｅｏｆＳｍ￣（３...     

Static and Cyclic Fatigue of Alumina at High Temperatures: II, Failure Analysis

Failure mechanisms of an alumina, tested at 1200°C under static and various cyclic loading conditions, were examined. Slow crack growth of a single crack is the dominant mechanism for the failure in specimens under cyclic loading with a short duration of maximum stress at all applied stress levels, as well as at high applied loads for static loading and cyclic loading with a longer hold time at maximum stress. At low stress levels, failure of static loading and cyclic loading with a longer hold time at maximum stress might occur by formation and/or growth of multiple macrocracks. More importantly, for all the given loading conditions. The viscous glassy phase behind the crack tip could have a bridging effect on the crack surfaces. A simplified model for calculating effective stress intensity factor at the crack tip under static and various cyclic loading demonstrated a trend consistent with the stress–life data.     

烧结温度和pH值对HA合成的影响

采用液相沉淀法制备了纳米级的HAP粉末,并进一步对合成的材料进行DTA和RD分析,研究了温度和pH值对羟基磷灰石粉体合成的影响。制备的羟基磷灰石粉体纯度较高,随着温度的增加其晶化程度增加。