不同剂量A群脑膜炎球菌多糖菌苗的反应

应用30和50μg A 群脑膜炎球菌多糖菌苗,接种不同年龄组儿童和青少年、观察其全身和局部反应及大面积普种的异常反应。结果表明:接种30和50μg 菌苗后全身和局部反应轻微,两种剂量的接种反应无差别,仅有两个点接种两个不同年龄组时出现50μg 的全身及局部反应高于30μg。普种50多万人均未发生异常反应。     

铸件中夹杂缺陷成因分析及改进对策

针对铸件中容易发生的缺陷——夹杂,分析其特征、危害以及形成的原因,从而探讨抑制夹杂缺陷的对策。     

磷对铸态厚壁高韧性球铁QT400—18延伸率影响的研究

讨论了磷在不同孕育条件下对铸态厚壁高韧性球铁ＱＴ４００—１８的延伸率的影响，研究了磷与硅共同作用对延伸率影响的规律，提出了减小磷在铸态厚壁高韧性球铁生产中有害作用的措施．     

Lactobacillus plantarum survival in aerobic., directly brined olives

Storage at 20°improved Lactobacillus plantarum survival in directly brined olives. The best inoculation dates were on the first and fifth days after brining for Cacereña and Hojiblanca cultivars respectively. Lb. plantarum was present throughout the storage period only in Hojiblanca olives covered with initial free-salt solution and inoculated on the fifth day. In the presence of that bacterium, titratable acidity (0.5-1%) and pH (<4.0) reached proper values for olive preservation. Yeast populations, consisting of Pichia membranaefaciens and Pichia fermentans, in Hojiblanca, and Pichia minuta, Pichia fermentans, Pichia membranaefaciens, and Rodotorula spp, in Cacereña, were found in all treatments.     

复合孕育对灰铸铁壁厚敏感性的影响

用锶硅铁和铬锰硅合金对ＨＴ２００铁水进行复合孕育，可减少铁件硬度对壁厚的敏感性，获得低成本优质铸件。     

混合菌种发酵生产永丰辣酱的工艺研究

用单因素和正交试验对影响永丰辣酱人工接种发酵工艺的发酵温度、发酵时间、酵母接种量和食盐用量等因子进行筛选。结果表明,添加11％的食盐、0．8％的鲁氏酵母种子液,在定期揿酱的前提下,28℃～40℃间歇式控温发酵30d;所得人工接种发酵产品总酯含量高,凡感官评价较好。     

浇包孕育用可调下料口孕育装置的研制及应用

提供一种浇包孕育用的可调下料口孕育装置,其不仅可在熔炉出铁时将孕育剂均匀分散地撒入出铁槽的铁液流中,而且孕育剂加入的时间长短可依据孕育工艺的要求随需调整,从而达到提高孕育效果及孕育剂利用率的目的.该装置结构新颖,易于制作,且操作轻松省力.     

Two-dimension mathematical modeling of photosynthetic bacterial biofilm growth and formation

A two-dimensional model is developed to describe the photosynthetic bacteria (PSB) biofilm formation on the solid surface in a flat-panel photobioreactor. The diffusion-reaction equations and cellular automata (CA) rule along with the previously obtained growth kinetics parameters of PSB are used to simulate the coupled mass transport and biochemical reaction as well as the biomass growth. With this model, the effects of the illumination intensity, pH value and initial inoculation on the formed biofilm morphology, porosity, roughness and thickness are investigated. Numerical results show that the biofilm porosity and thickness continuously decreases and increases during the PSB biofilm formation process, respectively, while the surface roughness reaches a stable value after a certain time. The optimal conditions for the PSB biofilm formation are the initial inoculation of 500, and the illumination intensity of 5000 lx and pH value of 7.0.     

Experimental investigation on chilled cast iron tappet manufacturing processes parameters

Chilled cast iron tappet has a tendency microstructure of white, mottled and gray iron. The exact composition and other casting parameters, like pouring temperature, inoculation and coating, need to be determined for achieving the desired thickness of the chilled layer. Chilled cast iron finds applications in areas where improved hardness and wear resistance are required. Mottled cast iron has very poor machinability and high brittleness due to the presence of secondary cementite. These constitute the limitations for its use. The influence of inoculation, pouring temperature, coating thickness and chill plate on chilled depth was investigated. Taguchi design-of-experiments (DOE) are used for generating an optimal set of casting parameters to obtain a satisfactory chilled depth. Analysis of the effects of all the parameters on chilled depth has been carried out through a microstructure study.     

在低铬铸铁改性处理中钒渣的冶金物化条件和作用

 在低铬铸铁改性处理中，VS+Ti+Zn复合孕育剂起着良好的孕育处理作用。从热力学角度分析了钒渣作为炼铁工业副产品得到二次利用的可行性，并讨论了冶金综合处理工艺和冶金物化条件对充分发挥钒渣复合孕育效果的作用。结果表明，钒渣复合孕育剂可有效地细化晶粒，改变碳化物形态；钒渣作为一种钢铁冶炼副产品，取代钒铁具有较大的资源利用价值。