努力提高过磷酸钙质量

论述以高浓度肥料作为发展方向的今天,过磷酸钙在我国仍应有其一定的地位。介绍扶余化肥厂在以浓酸矿浆法生产过磷酸钙中,采取的一系列技改措施:磷矿配矿使用,增加破碎,提高矿浆细度,定矿调水法磨矿,定浆调酸法混合等,并对磨矿机、混合器、料浆泵、风机等设备进行技改,使产品质量100%达标。     

强碱树脂在木糖应用中存在的问题及解决方法

木糖是一种在化工、食品等领域有着广泛用途的五碳糖,工业生产是用稀强酸将玉米芯中含有的大量多缩戊糖分解为单个的木糖分子,然后通过离子交换除盐、脱色,精制提取,但在强碱离子交换柱中,木糖分子容易被部分催化异构转化为阿拉伯糖,使得木糖纯度下降,结晶困难。考察了强碱树脂再生浓度、淋洗终点pH值、交换温度以及流速对木糖分子异构的影响,得出最佳的交换工艺条件:再生剂浓度为2%、淋洗终点pH值为7.5、交换温度20℃,流速为1BV/h。     

强化单螺杆挤出机内层流混合的方法

综述了单螺杆挤出机内聚合物熔体层流混合机理的研究进展，对提高混合的措施进行了分析总结，指出了进一步强化混合效果的方法。     

单螺杆混沌挤出过程周期性行为数值模拟

建立了混沌单螺杆挤出机计量段物理和数学模型。定义了更合理的边界条件,采用Carreau本构方程,采用有限体积方法对聚合物熔体在螺槽内流动的周期性效应进行了数值模拟分析。得到了不同位置的速度分布细节以及流体示踪粒子的行为轨迹。发现螺槽内速度分布表现出周期性和对称性的变化,揭示了同宿点及椭圆点存在及位置不变性,为进一步分析流体质点在相空间的动力学行为奠定了基础。     

单束纤维增强树脂基复合材料的热水老化性能研究

在96℃水中,对开芙拉29(Kevlar29),开芙拉49(Kevlar49)和聚苯撑苯并唑(PBO)纤维束增强的环氧树脂和双马树脂基复合材料进行老化实验后,再在60℃下进行干燥脱水处理。实验测定了吸水和脱水阶段的含水率及热水老化试样和干燥试样的弯曲性能。结果表明:在热水作用下,复合材料的弯曲强度和模量随热水老化时间的延长呈下降趋势,纤维与树脂基体间的界面发生破坏;再干燥脱水后,材料的弯曲强度和模量恢复,但仍低于未老化试样的性能,纤维与树脂基体间的界面破坏情况也类似。     

季戊四醇的超分子化学

介绍季戊四醇的超分子化学,包括超分子网状结构、螺环冠醚、非常规液晶、富勒烯衍生物、固相光催化反应、Janus树枝状分子等等。     

Understanding heterogeneous catalysis on an atomic scale: a combined surface science and reactivity investigation for the dehydrogenation of ethylbenzene over iron oxide catalysts

In order to study the dehydrogenation of ethylbenzene to styrene, epitaxial iron oxide model catalyst films with Fe₃O₄(111), -Fe₂O₃(0001) and KFe _x O _y (111) stoichiometry were prepared in single crystal quality on Pt(111). They were investigated using surface science techniques before and after atmospheric pressure reaction experiments in a newly designed single crystal flow reactor. As expected from low-pressure measurements, Fe₃O₄(111) is catalytically inactive. The catalytic activity of -Fe₂O₃(0001) starts after an activation period of about 45 min. After that, the surface is essentially clean but shows a high concentration of defects. On the potassium-promoted films, however, the activation period is much longer, the activity then is higher and the surface gets covered completely with carbon and oxygen during reaction. This indicates a different reaction pathway on the promoted films with a carbon–oxygen species as catalytically active species.     

一步法光致变色EVA夹层玻璃的生产

主要阐述了一步法生产光致变色夹层玻璃的方法及过程,介绍了生产中应注意的事项及生产设备.     

Variation in relative quantities of airborne sex pheromone components from individual femaleEphestia cautella (Lepidoptera: Pyralidae)

The airborne sex pheromone components (Z,E)-9,12-tetradeca-dien-1-yl acetate and (Z)-9-tetradecen-1-y1 acetate from single calling females ofEphestia cautella (Walker) were trapped within glass capillary tubes and were measured by gas chromatography-mass spectrometry. Broad and similar distributions of relative quantities were found for a laboratory strain and three Australian field strains, and means differed strongly from those reported previously for this species. The overall mean proportion of the two components found for Australian females was 8812. The composition in individuals ranged from 6327 to 973. The proportions for individuals appeared to vary slightly in a random fashion from day to day, and proportions for first-generation progeny were influenced by the maternal blend.Author order in this paper is alphabetical     

若干激光基质材料的晶纤生长及荧光性能

制备了以ZrO_2,Gd_2O_2,LiNbO_3或YAG为基质,具有不同掺杂离子的12个单晶纤维试样,还测量了这些试样的化学成份及荧光光谱。