公司知识管理系统解决方案

本文通过剖析公司知识管理系统中展示层及核心层的模块功能，阐述了该系统在知识系统化、知识安全与知识共享等需求方面的解决方案。     

高效液相色谱法同时测定冷饮中禁限用色素胭脂虫红酸、喹啉黄和碱性蓝26

在儿童食品中对胭脂虫红酸、喹啉黄和碱性蓝26的添加的监控是十分重要的。建立了棒冰样品中同时检测胭脂虫红酸、喹啉黄和碱性蓝26 3种红黄蓝色素的高效液相色谱定量分析方法,以乙腈-0.1%甲酸水溶液(pH 4.0)为流动相,Hydrosphere-C18色谱柱分离,双波长检测器检测,其检测波长随出峰情况分别先后调整为280、410和595 nm;可以实现棒冰样品中添加的胭脂虫红酸、喹啉黄和碱性蓝26的含量分析。该方法胭脂虫红酸和喹啉黄的线性范围均为0.4~100μg/mL,最低检出浓度均为0.2μg/mL,而碱性蓝26的线性范围为0.3~50μg/mL,最低检出浓度均为0.1μg/mL;方法的回收率为90%~98%,峰面积的相对标准偏差(RSD)为0.5%~3.7%。此外,我们还进一步考察了前处理方法中采用聚酰胺固相萃取法实现棒冰样品的净化和富集,与高效液相色谱法联用可以实现上述3种色素的同时分析检测。     

双40岸边集装箱装卸桥吊具上架可靠性及高效性

针对ZPMC在德国汉堡HHLA-CTB码头双40英尺岸边集装箱装卸桥交机调试过程中存在的一些问题进行分析探讨,得出影响作业效率和功能的因素,为双40英尺岸边集装箱装卸桥的设计改进提出了借鉴性的意见。     

笼状磷酸酯微胶囊/聚磷酸铵阻燃聚丙烯

将笼状磷酸酯微胶囊(ET)与聚磷酸铵(APP)复配用于阻燃聚丙烯(PP)。采用氧指数和UL 94评价了阻燃PP的阻燃性能,采用热重分析、扫描电子显微镜照片、傅里叶变换红外光谱及X射线电子能谱研究了阻燃剂的协同效应和阻燃机理。结果表明:ET与APP有较好的复配协同效应,ET/APP的阻燃性能随m(ET)/m(APP)的不同而变化。当m(ET)/m(APP)为1∶2时,阻燃效果最好。w(ET/APP)为30%时,氧指数达29.7%,且达到UL 94 V-0级。     

PP链结构对反应挤出制备长链支化PP的影响

以过氧化二异丙苯(DCP)为引发剂、1,4-丁二醇二丙烯酸酯(BDDA)为接枝单体,通过反应挤出制备长支链聚丙烯(PP),研究了PP链长及主链中乙烯嵌段含量对PP长链支化程度的影响。随着PP树脂分子链长度降低以及乙烯嵌段含量增加,PP大分子自由基发生接枝和双基偶合扩链反应的几率增大,导致BDDA在PP主链上的接枝率提高,反应挤出产物的熔体弹性效应增强以及在Cole-Cole曲线出现上翘所对应的动态黏度降低。黏度降低表明分子链松弛时间增加,PP长链支化程度增大。。     

不同环境介质中酚菌酮残留的分析方法研究

采用乙酸乙酯液-液分配的方法分离、净化水中酚菌酮残留,丙酮振荡提取土壤中酚菌酮残留,利用气相色谱-质谱(GC-MS)法和高效液相色谱(HPLC)法2种方法分别测定水和土壤中酚菌酮的残留量。结果表明,GC-MS法的酚菌酮线性检测范围为1.0～100.0 mg/L,相关系数为0.9933。水中酚菌酮的加标回收率为98.47%～102.23%,相对标准偏差为2.43%～4.91%;土壤中的加标回收率为92.62%～100.47%,相对标准偏差为1.14%～14.19%。HPLC法的线性检测范围为0.1～10.0 mg/L,相关系数为1.0000。水中酚菌酮的加标回收率为87.80%～90.87%,相对标准偏差为4.06%～7.94%;土壤中的加标回收率为89.23%～101.03%,相对标准偏差为0.31%～7.12%。     

Opportunities and challenges of Chinese die-casting market

The present status and perspectives of Chinese die-casting market were commented. In 2003, the total output of die castings in the whole country was 708000 tons, in which the outputs of Al-alloy, Zn-alloy, Mg-alloy, Cu-alloy die castings were 474600 tons, 222000 tons, 5800 tons, 5600 tons, respectively, each accounted for 67％, 31.35％, 0.85％, 0.8％ of the total. The annual sale volume of die-casting machines was approximately 1800. And the gross output value of dies approached RMB 38 billion, in which die-casting dies accounted for about 10％. In the die-casting industry of the entire country, the foreign capital enterprises, public-run enterprises, township and village enterprises, private enterprises accounted for over 80％ of the total die-casting enterprises. Super huge die-casting groups are forming.     

Analysis of solute redistribution and centerline segregation in continuously cast thin slab

1 .Introduction Macro-segregation is induced by the solute redistributionnear the solidification interface and it is affected by thefluid flow in the mushy zone. Centerline segregation oftenformed in continuous casting strands along the castingdirection, so the property uniformity of products isseverely destroyed.     

Effect of partial remelting time on the initial carbide in semisolid structure of hypereutectic high Cr cast iron

1 .Introduction High chromium white cast iron is one of the wear-resistant materials widely used at present. With an increase of carbon content, the volume fractions of carbides increase. As a result, its wear resistance is enhanced and impact toughness declines co}espondingly If the carbon