波士顿矩阵资源规划应用

本文研究了影响出版社资源配置的可变因素:销售量、市场竞争力(满意度、市场占有率)、人力资源成本和长远发展策略;首先利用波士顿矩阵模型量化市场竞争力,通过市场增长率与相对市场份额反映A社不同出版物的市场行情和发展前景,综合考虑长远发展;然后以人力资源效用最大(人均创造的销售额最大)为目标,以人力资源、书号量和申请书号规则为约束,建立非线性整数规划模型,最后,通过改变模型的波士顿参数,Lingo求解得到了5种不同发展战略的资源配置方案,大大增强了模型的通用性与可操作性。     

新疆博斯腾湖水污染现状评价

运用主成分分析法和系统聚类法对新疆博斯腾湖近10年的水污染状况进行评价,分析结果可知,近10年博斯腾湖的水污染程度总体呈下降趋势,这与政府有关部门的环保措施和政策是分不开的,但从聚类上不难发现,10年间改善幅度并不大,有关部门治理博斯腾湖水污染的力度还有待提高．     

正交设计法优化爬山虎根皮中白藜芦醇的浸提工艺

为了探索爬山虎根皮中白藜芦醇提取的最佳条件,以白藜芦醇浸提率为指标,在单因素试验的基础上,应用正交设计法优化爬山虎根皮中白藜芦醇的提取条件。结果表明：乙醇浓度、提取温度和提取时间对爬山虎根皮中白藜芦醇的提取效果有显著影响,且为非线性关系;最佳提取条件为乙醇浓度70%、提取温度60℃、提取时间48 h,料液比1 g/6 mL;在此条件下白藜芦醇的提取率为75 mg/kg。     

Oriental lacquer,poison ivy,and drying oils

From the oriental lacquer tree Toxicodendron vernicifluum, a sap (emulsion) is obtained the oil‐soluble components (urushiol) of which consist of a mixture of 3‐n‐pentadecylcatechols and very small amounts of 3‐n‐heptadecylcatechols. Urushiol is the basis of oriental lacquer. The sap is conditioned by removal of most of the water by specific techniques, and the clear liquid is called oriental lacquer. It is used in the Orient for coatings to produce exquisite art objects. Poison ivy also has as its active ingredients 3‐n‐pentadecylcatechols, but they have a high diene content, which does not cure effectively. In humans 3‐n‐alkylcatechols cause severe contact dermatitis. The components of drying oils are glycerin esters of fatty acids derived from the families of palmitic (hexadecanoic) and stearic (octadecanoic) acids. In the case of the urushiols, as well as of the glycerides of drying oils, high unsaturation (60%) in the form of trienes in the long aliphatic chains is essential for curing. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 4327–4335, 2000     

超高效液相色谱法同时测定洋常春藤中8种成分含量

建立了同时测定洋常春藤中绿原酸、隐绿原酸、芦丁、烟花苷、常春藤皂苷C、常春藤皂苷D、常春藤皂苷B和α-常春藤皂苷8种成分的超高效液相色谱法(UHPLC)。以80%甲醇为溶剂,将药材粉末于85℃、料液比1∶100条件下水浴回流1 h,制备供试品溶液;采用Agilent ZORBAX Eclipse Plus-C_(18)(2.1 mm×100 mm,1.8μm)色谱柱,以乙腈-0.05%磷酸溶液为流动相进行梯度洗脱。结果表明,上述8种成分均获得良好的分离度;仪器精密度、方法重复性的相对标准偏差(RSD)均小于3.0%;样品溶液在室温条件下24 h内稳定;8种成分在对应质量浓度范围内线性关系良好(r≥0.999 5),检出限为0.40～10.58μg·mL~(-1),定量下限为1.31～34.61μg·mL~(-1),平均回收率为97.3%～108%,RSD(n=6)为0.51%～3.2%。该方法适用于洋常春藤中上述8种化学成分的定量分析。