A PACS Scheme Based on High-speed Ethernet

Picture archiving and communication system(PACS) is the key way to realize the medical images modernized management, the main work of which is to ensure the medical image information can be transmited and applied with high efficient. The Ether net is a popular local net. The author has described a PACS scheme based on high speed Ether net, with which, many modular functions (medical image sampling, medical image processing, medical image storage, medical image management, medical image review, medical image transmission, medical image edit, et al) can be realized. Also, the PACS can be fused with HIS.     

豆油乙二醇乙醚酯生物柴油燃料特性研究

以乙二醇乙醚和精制大豆油在金属钠催化下合成出了豆油乙二醇乙醚酯生物柴油,考察了该生物柴油作为替代燃料在性能方面与柴油的差别;研究了作为柴油添加剂,其加入量对混合燃料性能的影响.结果表明,豆油乙二醇乙醚酯生物柴油的燃料特性达到了国外生物柴油生产标准,可以直接作为柴油使用,也可与矿物柴油掺舍使用,提高了柴油的使用性能.     

Marine Sponge Dysidea herbacea revisited: Another Brominated Diphenyl Ether

A pentabrominated phenolic diphenyl ether (1) that has not previously been reported from marine sources has been isolated from Dysidea herbacea collected at Pelorus Island, Great Barrier Reef, Australia. The structure was determined by comparison of NMR data with those of known structurally-related metabolites. NMR spectral assignments for (1) are discussed in context with those of three previously reported isomeric pentabrominated phenolic diphenyl ethers.     

含二茂铁基王冠化合物的合成

由环戊二烯和FeCl2 在 (CH3 CH2 ) 2 NH作用下可制得二茂铁 (双环戊二烯基铁 )。把乙酰化的二茂铁和甲酰化的苯并十五冠五在碱性溶液中化合 ,经柱色谱分离可制得具有分子式C2 7H3 0O6Fe的缩合产物。如把 4′ -甲酰基苯并十五冠五与 1,1′ -二乙酰基二茂铁在碱性条件下反应 ,由于冠醚的巨大空间阻碍作用 ,也只能得到一元缩合产物。不是得到二元缩合产物。二乙酰基二茂铁的制备过程与乙酰基二茂铁相似 ,只是前者的反应温度更高     

二甲醚作为汽车代用燃料的应用前景

介绍了新型燃料二甲醚的应用优点,提出了其应用中存在的问题,并展望了其应用前景。     

液液萃取/气相色谱法测定废水中的三氯甲烷

建立了液液萃取/气相色谱法测定水中三氯甲烷的分析方法。选取石油醚、四氯化碳、环己烷、二硫化碳四种有机溶剂作为三氯甲烷萃取剂,确定了萃取方法和萃取次数,配制4种标准系列溶液,并对标准溶液和萃取溶液进行色谱分析。结果表明:4条标准曲线相关系数>0.9950,标准偏差<4%,加标回收率>75%。其中,石油醚的萃取效果最好为5.88 mg/ml,标准偏差为1.09%,加标回收率最高为99.21%,最低检出限为5.56×10-3mg/L。二硫化碳萃取效果最差为3.15 mg/ml,标准偏差为3.89%,加标回收率75.63%,最低检出限为9.58×10-2mg/L。环己烷和四氯化碳介于两者之间。该方法具有重现性好、准确度高、快速、简便的特点,为三氯甲烷的萃取研究提供一定的参考价值。     

Synthesis of N-4-vinylbenzyl-monoaza-m-phenylene-34-crown-11 and its copolymerization with styrene

A functional monomer, containing a 34-membered monoazacrown ether unit (VACE) as a pendant group has been synthesized by using resorcinol, tetraethylene glycol, p-tolenesulfonyl chloride and 4-vinylbenzyl chloride as starting materials. The product structure was characterized by means of FT-IR,¹H-NMR, EA and MS. Free radical homopolymerized VACE or copolymerized VACE with styrene (ST) by the conventional radical initiator 2,2′-azobis (isobutyronitrile) (AIBN) in toluene solution to afford corresponding polymers. The reactivity ratio of VACE and ST, determined by Fineman-Ross method, gave values 0.6 for VACE, and 1.4 for ST, respectively.     

有机溶剂对有机氯农药污染场地土壤淋洗修复效用研究

Problems associated with organochlorine pesticide (OCP)-contaminated sites in China have received wide attention. To solve such problems, innovative ex-situ methods of site remediation are urgently needed. We investigated the feasibility of the extraction method with different organic solvents, ethanol, 1-propanol, and three fractions of petroleum ether, using a soil collected from Wujiang (WJ), China, a region with long-term contamination of dichlorodiphenyltrichloroethanes (DDTs). We evaluated different influential factors, including organic solvent concentration, washing time, mixing speed, solution-to-soil ratio, and washing temperature, on the removal of DDTs from the WJ soil. A set of relatively better parameters were selected for extraction with 100 mL L 1 petroleum ether (60-90℃): washing time of 180 min, mixing speed of 100 r min 1 , solution-to-soil ratio of 10:1, and washing temperature of 50℃. These selected parameters were also applied on three other seriously OCP-polluted soils. Results demonstrated their broad-spectrum effectiveness and excellent OCP extraction performance on the contaminated soils with different characteristics.     

A new synthetic method of 2,3,4,4'-tetrahydroxybenzophenone by boron trifluoride catalysis北大核心CSCD

A new synthesis of 2, 3, 4, 4'-tetrahydroxybenzophenone by boron trifluoride etherate catalysis was proposed in this paper. In the new method, high boiling-point petroleum ether was used as the reaction solvent to replace the poisonous and expensive 1, 1, 2, 2-tetrachloroethane. Although p-hydroxybenzoic acid, pyrogallic acid, boron trifluoride and petroleum ether were immiscible at room temperature, the reaction system could be gradually turned into brown oily solution in the heating and rapid mixing conditions. After a period of time, a large amount of yellow crystalline products were precipitated. According to the results of orthogonal experiments, the optimum reaction conditions were as follows:pyrogallic acid 0.05 mol, p-hydroxybenzoic acid 0.055 mol, catalyst 0.16 mol (20 mL), reaction temperature 110 ℃ and reaction time 1 h. Under this condition, the yield reached 83.24% and product purity 97.83%. The new method possessed many advantages, e.g., low toxicity, low cost, short reaction time, easy operation and the recycled catalyst. The product with 99.53% purity by recrystallization in water was identified as 2,3,4,4'-tetrahydroxybenzophenone by the combination of IR, NMR and EI-MS techniques.     

小桐子枝叶石油醚萃取相杀虫物质的分离和鉴定

为寻找小桐子枝叶中的杀虫活性物质,以具有杀虫作用的小桐子枝叶乙醇粗提物的石油醚萃取相为试验材料,对其采用硅胶柱反复柱层析,结合薄层层析制备分离及对各阶段分离产物进行活性追踪筛选,获得具有杀虫作用的活性部位AJ1,初步鉴定出活性部位主体成分.结果表明:AJ1活性组分在质量浓度为8 mg/mL时,对桃蚜(Myzus persicae (Sulzer))和菜青虫(Pierisrapae L.)的24 h(72 h)校正死亡率均大于70％,与吡虫啉无显著差异,显示出极高的毒杀活性.对AJ1组分进行GC-MS分析,初步鉴定了含量最高的9个化合物,为总量的96.18％,其中含量前5位的物质依次是1-烯丙氧基,2-异丙醇、4-乙炔基-1,2-二甲基-4喹啉醇、4烯丙氧基-2-甲基2戊醇和2,4-二甲基癸烷和1-(已氧基)辛烷,5种主要成分为总量的83.81％.