银杏叶活性成分提取与分离的研究

采用70％乙醇热回流提取银杏叶中的活性成分,在浓缩过程中按照7:1的比例减压浓缩,以减少活性物质的损失,提取率和活性成分含量均有明显提高。并用薄层层析法和柱色谱技术进一步分离提取物中的银杏内酯B。     

燃气轮机压气机喘振监测方法研究

压气机喘振是一种对燃气轮机安全运行具有严重破坏作用的不稳定流动。在研究某燃气轮机控制系统的过程中发现,其控制逻辑中没有针对压气机喘振的控制策略。为了保证燃气轮机安全运行,避免发生喘振对燃气轮机造成破坏,在现有测点基础上研究了在燃气轮机控制系统中增加压气机喘振监测的方法。     

超临界CO2抽提法脱脂的研究

研究了超临界 CO2 抽提去除绵羊皮中油脂的新技术。试验了皮样水分、CO2 浓度、CO2 流速和抽提时间等因素对脱脂率的影响。结果表明 :绵羊皮脱脂率随着 CO2 浓度、CO2 流速和抽提时间的增大而提高 ;随着水分的增加而降低。在最佳试验条件下 ,脱脂率可达 94 %以上。     

一种获取重复绘制草图单元识别特征数据的方法

提出了一种草图识别特征数据分析结合图像边缘提取算法的方法,以得到设计师重复绘制草图单元的识别特征数据,从而完成重复绘制草图单元的识别。首先通过记录设计师绘制的所有草图数据,然后通过图像边缘提取算法提取出目标草图,再根据目标草图分析所有原始草图数据得到构成目标草图的原始草图序列,最后通过数据分析计算,得到该目标草图的草图识别特征数据。     

萝卜色素的性质研究

本文报道了从红心萝卜中提取的花青素类红色天然色素的理化性质，包括光谱特性和溶液ｐＨ、金属离子及食品基质对萝卜色素呈色和稳定性的影响等。与其他来源的花青素类色素一样，随ｐＨ增大，最大光吸收波长（λｍａｘ）向长波方向移动。金属高子（Ｆｅ￣（３＋）、Ｃｕ￣（２＋）、Ａｌ￣（３＋））对该色素的稳定影响不大，蔗糖、ＮａＣｌ、淀粉等食品基质能明显地增强萝卜色素水溶液的颜色。     

四倍体甜菜种株开花规律研究

根据四倍体甜菜种株开花特性，采取花药于早６时前，人工杂交在６时３０分后进行为宜，染色体倍数性鉴定应在６月初至６月中旬进行，可将日开花率达５％作为进入盛花期标准，盛花期为１０天左右。此时期保证土壤水分至关重要，在盛花期后５天左右进行摘尖，以提高种子千粒重，早８￣１０时为种株日开花高峰期，是进行田间人工辅助授粉的最佳时期。     

四倍体甜菜种株生育规律的研究

将四倍体甜菜种株的一生划分为八个生育时期，全生育期需积温２２４３．３℃，种株生长呈Ｓ型曲线，现蕾期至盛花期是干物质生产速度和总量增加最快的时期，二、三级枝种子量占全株的８７．６％。     

高产类胡萝卜素红酵母的筛选及其发酵条件

通过对数株红酵母培养后发酵液中菌体生物量及类胡萝卜素含量的测定比较,从中选出了1株产类胡萝卜素能力较强的红酵母RY-98;研究了该菌株产类胡萝卜素的最适碳源和氮源,并对其主要营养与环境条件进行了选择及优化,获得了最佳发酵条件葡萄糖40g/L、(NH     

Physicochemical and structural characteristics of starches from Chinese hull‐less barley cultivars

Fourteen hull‐less barley cultivars, collected from four major cultivated areas in China, were employed to investigate the structural and physicochemical properties of their starches in this study. Relatively wide variations in physicochemical properties of the starches were observed. Amylose content ranged from 23.1% to 30.0%, swelling power and water solubility index ranged from 12.8 to 19.9 g g^?1 and 12.7% to 23.7% respectively. Peak viscosity was from 170 to 346 Rapid Visco Unit (RVU), peak temperature (T_p) of starch gelatinisation was from 55.6 to 61.8 °C and enthalpy of starch retrogradation ranged from 0.3 to 3.1 J g^?1. Weight‐based chain‐length proportions of fa, fb₁, fb₂ and fb₃ in amylopectins ranged from 21.65% to 24.95%, 44.48% to 49.44%, 15.56% to 17.19% and 9.83% to 16.66% respectively. Correlation analyses showed that amylose content was inversely related to pasting parameters and enthalpy of gelatinisation. Pasting properties and amylopectin structures were the most important parameters to differentiate starch properties among different hull‐less barley cultivars in this study. This work will be useful for exploring applications of Chinese hull‐less barley starches in food and non‐food industries.     

Analysing ownership,locational and internalization advantages of Chinese construction MNCs using rough sets analysis

The rough sets analysis focusing on the ownership, locational and internalization (OLI) advantages of Chinese construction multinational corporations (MNCs) in the international market under Dunning's Eclectic Paradigm was adopted to overcome the sample size constraint in MNC research that seeks to examine the causality patterns of the factors identified. The rough sets methodology provides a solution that conventional statistical methods do not offer to ascertain how these factors are determined and their influence in the OLI analysis of the performance of Chinese construction MNCs. The rough sets approach to handling imperfect data with uncertainty and vagueness was adopted to describe dependencies between attributes, evaluate the significance of attributes and deal with inconsistencies. Based on a questionnaire survey of 31 Chinese construction MNCs, findings from the rough sets analysis suggest, among other things, that: (1) a firm is likely to perform well in terms of its ownership advantages when it has a significant advantage on its reputation and its accessibility to resources when compared with local contractors; (2) a firm may be expected to achieve better results in terms of its locational advantages if the large number of competitors from China in the host countries becomes its most important consideration; and (3) a firm that conscientiously avoids or reduces information search and business negotiation costs would tend to perform well in terms of its internalization advantages.