不同成型工艺对板青颗粒主要指标成分的影响

以溶化性、水分、颗粒中腺苷的含量为指标,研究两种成型工艺对板青颗粒主要指标成分的影响,从而为板青颗粒生产筛选先进的成型工艺。结果表明,沸腾制粒工艺所得颗粒在水分、溶化性方面有显著优势,腺苷的含量是传统摇摆制粒工艺的1.5倍,故建议板青颗粒生产选择沸腾制粒成型工艺。     

卤代苯沸点与分子结构的定量关系

用结构信息连接性指数mL研究了卤代苯的沸点与分子结构之间的定量关系。提出了计算有机物分子中成键原子点价izδ*的新方法。基于izδ*和分子图的邻接矩阵,建构了一个新的结构信息连接性指数mL(m=0,1,2),并研究了mL指数与卤代苯沸点的相关性。结果表明,mL指数与卤代苯的沸点具有良好的性质相关性,其相关性明显优于mXv指数(Kier指数)。以mL(m=0,1,2),lgmL(m=0,1,2)和相对分子质量MW为自变量的六元和七元回归方程的相关系数分别为0.999 1和0.999 6,其对卤代苯沸点的预测结果非常令人满意。     

Influence of cultivar and prewarming on texture retention of thermally processed potatoes

Summary Potato cubes (2.5 cm) of six cultivars were soaked in CaCl₂ solution (0.004% calcium) at 4°C for 21 h, prewarmed at 75°C for 30 min, and boiled (20 min) or microwaved (2 min, 15 sec). Prewarming treatment significantly retained fracturability (g force at first break point) of boiled samples over non-treated controls. Thirty min prewarming at 75°C gave maximum fracturability retention for boiled samples; prewarming time had no effect on texture of microwaved samples. Cultivar differences in fracturability correlated with inherent tuber calcium content.     

几种添加剂对速冻饺子皮耐煮性及感官品质的影响

研究了不同添加剂对速冻饺子品质的影响。结果表明,影响速冻饺子品质的主要因素是增稠剂、食盐、络合剂以及用水量,它们分别与速冻饺子皮的耐煮性和感官品质有关。     

INFLUENCE OF THE GEOMTRIC PARAMETERS OF LOW FINNED TUBE ON BOLHING HEAT TRANSFER AND OPTIMIZATION OF THE PARAMETERS

On the basis of the mechanism of the boiling heat transfer on low finned tube, the influence of the geometric parameters of low finned tube on boiling heat transfer is synthetically analyzed and relevant criteria which affect the optimal structure of low finned tube is deduced in this paper. The boiling heat transfer experiment on low finned tube is conducted. Distilled water and R-113 are used as test fluids The experiment is performed at local atmospheric pressure. Synthesizing a large amount of experimental data, the semiempirical equations for the optimal geometric parameters of lowfinned tube are established     

Determination of Liquid Superheat Limit in Homogeneous Nucleate Boiling Using Density Fluctuation Theory

The liquid superheat limit and critical radius of bubbles in homogeneous nucleateboiling are determined in the present paper by using density fluctuation theory of statistical theomodynamics.Taking water as an example,calculation was performed to predict the superheat limit of itunder different pressure.A detailed discussion on some important concepts concerned was made.     

Dtermination of The Suppression Faction of Chen''s Model in Flow Boiling

In present paper, the suppression factor of Chen's model is determined, based on the force and heat balance on a vapour bubble and Clausius-Clapeyron equation, the active nucleate cavity size of flow boiling surface and its disperse characteristic. Furthermore, the correlation is attained using Chen' model and the present suppression factor from the experimental data of R134a and R22 for a smooth tube. The correlation agrees well with the experimental data. It demonstrates the present suppression factor is able to promote the accurate which predicts the heat transfer coefficient of flow boiling in Chen's model.     

基于虚拟样机技术气吸振动式精播装置振动台特性研究

振动气吸式精播装置采用振动方式改善种子的流动性,使种子产生有利于吸种的沸腾运动。为此,基于虚拟样机技术研究振动台特性,找到了该精密播种装置在符合播种农艺时振动台振动参数及其范围,有利于减少振动台的物理样机试验次数、降低试验成本,对精播机设计有指导意义。     

寒带黑色处治路面施工的探讨

本文作者通过对加格达奇区人民路黑色路面的施工以及其它街道黑色路面近几年来观查，对在寒冷地区黑色路面施工易形成的问题进行简要的论述。     

The effect of different pre-sowing seed treatments, temperature and light on the germination of five Senna species from Ethiopia

The germination requirements of five Senna species: S. bicapsularis, S. didymobotrya, S. multiglandulosa, S. occidentalis and S. septemtrionalis have been investigated. Seeds possess dormancy which is caused by their hard seed coats hampering maximum, uniform and rapid germination. To overcome this dormancy, seeds of the five species were pre-treated with (a) mechanical scarification, (b) concentrated sulphuric acid for 15, 30, 45 and 60 minutes and (c) boiling water for 15, 30, 45 and 60 seconds. To determine the effects of temperature on the germination of seeds, pre-treated seeds from each species were incubated at 10, 15, 20, 25 and 30°C. Germination was also tested in the dark. Both acid treatment and mechanical scarification resulted in fast and uniform germination. The highest germination (95–100%) for all species was obtained from seeds treated with sulphuric acid for 60 minutes. Mechanical scarification resulted in 100% germination in all the species except S. septemtrionalis (59%). Boiling water improved germination significantly in S. didymobotrya (98%), S. occidentalis (82%) and S. septemtrionalis (97%), but had very little effect on S. multiglandulosa and reduced germination in S. bicapsularis. Senna seeds germinated over a wide range of temperatures with the optimum temperatures for germination falling around 20–25°C. Germination was either completely inhibited or very low at 10°C. Seeds of all species germinated both in light and dark conditions.