神经元网络理论在乙烯精馏塔成分估计中的应用

针对前馈神经元网络误差反向传播算法（ＢＰ算法）收敛速度慢，且常常收敛于局部极小值等缺陷，提出了一种基于变步长、加压缩因子的共轭梯度搜索的快速学习算法。与标准的ＢＰ法相比，该方法不仅学习收敛速度快，而且精度也有所提高。通过对乙烯精馏塔成分估计的应用表明，该方法比最小二乘估计法具有更好的外推性。     

分子蒸馏法制备鱼油多不饱和脂肪酸

研究了多级分子蒸馏法提取深海鱼油中多不饱和脂肪酸的工艺方法,通过对压力和温度的控制得到不同多不饱和脂肪酸含量的各级鱼油产品,当蒸馏温度为110℃以上,蒸馏压力为20Pa以下时,经过三级串联分子蒸馏,得到高碳链不饱和脂肪酸质量分数为90.96%的鱼油产品,并用气相色谱法测定了产品的脂肪酸组成,分析了产品的理化指标.     

Cleansing technique using high-velocity steam–air micromist jet spray

Application of a high-velocity steam–air micromist jet spray (HVS-AMJS; micromist average diameter: 2.4?μm) for cleansing the skin is proposed. Low-pressure steam is mixed with compressed air (pH 6.5) in a nozzle, and then sprayed at a pressure of ≦0.25?MPa and a velocity of ≧0.34?m/s on the skin or surface of material located approximately 5–10?cm from the nozzle. The temperature on the sprayed surface and water flow rate could be controlled between 42?°C and 46?°C and at approximately 50?mL/min, respectively. Compared with ultrasonic cleansing with tap water and rubbing with only tap water, the HVS-AMJS successfully removed fluorescent lotion covering pieces of wood and significantly reduced both the number of coliforms and the total viable counts on pieces of wood and gauze. Furthermore, the HVS-AMJS effectively removed oily ink from the skin of hairless rats, and temporarily elevated the skin temperature and blood flow, indicating massage effects. The striking characteristics of this cleansing technique using HVS-AMJS are not only its ability to remove microbes and residue without using any chemicals or detergents but also its massage effects.     

毛血藤挥发性成分GC-MS分析

目的:分析毛血藤根茎的挥发性成分,为毛血藤的开发利用提供实验依据。方法:利用水蒸气蒸馏法提取毛血藤根茎的挥发性成分,采用气相色谱-质谱联用(GC-MS)技术对挥发性成分进行分析。结果:共分离出99个化学成分,鉴别出60个化学成分,占挥发油总量的68.598%,其主要成分为柏木脑(7.001%),麝香草酚(5.948%),己醛(4.593%),双戊烯(3.708%),芳姜黄酮(3.438%),壬醛(3.256%)等。结论:本文采用气相色谱-质谱联用法对毛血藤根茎的挥发性成分进行研究,为毛血藤的综合利用提供科学依据。     

栀子不同炮制品中挥发油类成分的GC-MS分析

栀子果实含有挥发油类成分,不同炮制品的栀子挥发油种类和比例相差甚远.该实验以生栀子、炒栀子、焦栀子、栀子炭等4个炮制品种为研究对象,利用水蒸气蒸馏法提取挥发油,结果生栀子、炒栀子、焦栀子、栀子炭中的挥发油质量分数分别为1.2,1.0,0.9,0.7 μL·g^-1.以GC-MS技术鉴定并比较了4类栀子饮片挥发性成分差异,共124种挥发油成分被鉴定,其中生栀子中鉴定53种,炒栀子54种,焦栀子32种,栀子炭43种;根据峰面积归一化法分析,其分别占各栀子饮片挥发油总量的93.85%,92.01%,91.59%,90.81%.该文用GC-MS分析栀子不同炮制品种中挥发油成分组成及其含量变化,为阐释栀子饮片炮制机制提供科学依据.     

快读阅读器在植入体生物监测中的应用

生物细胞程序性死亡是灭菌效果监测的最可靠指标。常规生物PCD的培养周期是7,如果实施植入体监测,当结果异常时却无法执行召回制度,因此不能满足临床手术中最大限度降低手术感染的风险。本文介绍我院应用3MTMAttestTM290自动阅读器,在植入体生物监测中培养时间快速,有效确保了整个灭菌过程达到无菌水平。     

酒精废液蒸发浓缩装置热能综合利用的研究应用

结合多年对酒精废液蒸发系统的研究设计与生产实践经验,重点论述蒸发装置热能综合利用的途径,供蒸发装置的选型确定或现有蒸发系统的改造以参考。     

乙烯塔节能控制专家系统的研究

针对乙烯精馏塔建立了基于产生式规则的节能控制专家系统。阐明了该专家系统的结构与设计思想,并基于乙烯塔节能模型的特征,提出了一系列功能块,如:知识的获取,知识的表达以及数据库的建立等。仿真研究表明,该专家系统能简单、有效、可靠地应用。     

Fluorine labeling in biosynthetic studies(I): Synthesis of fluorfarnesols

The Synthesis of E,E,E-12-fluorofarnesol and E,Z-6-fluorofarnesol which are key intermediates for the study of biosynthesis of some sesquiterpenes, is decribed. E,E-Farnesyl acetate is treated with selenium dioxide to give E,E,E-12-hydroxy farnesyl acetate, which is transformed by DAST into E,E,E-12-fluorofarnesylacetate. The latter compound is hydrolyzed to E,E,E-12-fluorofarnesol. The Reformatsky reaction of 6-methyl-5-hepten-2-one with ethyl bromofluoroacetate affords ethyl 2-fluoro-3-hydroxy-3,7-dimethyl-6-octanoate. This ester is acetylated and eliminated to give ethyl (Z)-2-fluoro-3,7-dimethylocta-2,6-dienoate, which is transformed to allyl bromide via allylic alcohol. The allyl bromide is treated with dianion of methyl acetate to give-keto ester. The β-keto ester is converted to diethyl phosphoryloxy compound. The conjugate addition of lithium dimethylcuprate to the latter compound gives fluoro ester, which is treated with DIBAL to afford E,Z-6-fluorofarnesol.     

非诱导条件下犬骨髓基质细胞的生物学特性

目的 研究体外培养骨髓基质细胞(BMSC)的生长特点和非诱导条件下的成骨特性。方法 采用犬来源BMSC体外扩增培养，观察非诱导条件下BMSC生长变化和成骨分化。结果 形态学观察表明，BMSC贴壁细胞呈集落生长，有成纤维细胞样外观，未加入成骨诱导剂，细胞形态发生变化，钙沉积出现，碱性磷酸酶(ALP)表达。3代内扩增的BMSC有成骨活性，但原代细胞成骨活性优于传代后细胞。结论 体外培养BMSC能大量扩增，具有自然向成骨细胞分化的能力，是骨组织工程理想的种子细胞。本实验所培养的BMSC具有骨祖细胞特性。