Physico-chemical properties of various palm-based diacylglycerol oils in comparison with their corresponding palm-based oils

Palm-based diacylglycerol (P-DAG) oils were produced through enzymatic glycerolysis of palm kernel oil (PKO), palm oil (PO), palm olein (POL), palm mid fraction (PMF) and palm stearin (PS). High purity DAG (83–90%, w/w) was obtained and compared to palm-based oils (P-oil) had significantly (P < 0.05) different fatty acid composition (FAC), iodine value (IV) and slip melting point (SMP). Solid fat content (SFC) profiles of P-DAG oils as compared to P-oils had less steep curves with lower SFC at low temperature range (5–10 °C) and the higher complete melting temperatures. Also, P-DAG oils in contrast with P-oils showed endothermic as well as exothermic peaks with higher transition temperatures and significantly (P < 0.05) higher crystallisation onsets, heats of fusion, and heats of crystallisation. Crystal forms for P-DAG oils were mostly in the β form.     

高压共轨喷油器蓄压腔进油通道设计

为了满足大功率柴油机的需求,进一步控制系统内的压力波动,减小共轨喷油器内压力波动对系统轨道压力的影响,对一种高压共轨喷油器蓄压腔进油通道进行了优化设计.利用三维流体分析软件FLUENT对喷油器蓄压腔进油通道进行了仿真分析,通过对不同凸边长度的进油通道及不同节流孔的进油通道流场计算,发现蓄压腔进油通道加凸边的设计结构,当凸边结构小于3mm时,可以实现不影响喷油量的同时,降低共轨系统内的压力波动.     

~(188)Re-硫化铼混悬液药盒的研制

研制了一种药盒 ,能简单、快速、有效地制备188Re -硫化铼混悬液制剂。药盒由A、B、C 3瓶 (10mL/瓶 )组成 ,在无菌环境下 ,配制各种试剂。A瓶加入mol比为 70 :1的Na2 S2 O3 和KReO4溶液 1mL ,再加入一定量的赋形剂 ;B瓶加入 5mol/L的盐酸溶液 1mL ;C瓶加入摩尔比为 10 0 0 :1的PVP和NaOH溶液 1.5mL。B瓶加盖密封 ;A瓶和C瓶在冷冻干燥后 ,压盖密封。无菌、细菌内毒素及安全性检验均合格。常温下放置 ,制备188Re -硫化铼混悬液 ,在两个月内始终保持很高的标记率 (>98% ) ,颗粒度为 1— 5 μm(6 0 .1± 12 .7) % ;5— 10 μm(30 .9± 8.1) % ;>10 μm(9.0±4 .7) %。制备的188Re -硫化铼混悬液在 5天内非常稳定 ,放化纯度 >98% ,颗粒度为 1— 5 μm(49.9± 4 .4 ) % ;5— 10 μm(41.1± 5 .4 ) % ;>10 μm(9.0± 3.3) %。     

fac-[Μ(CO)_3]~+(Μ=~(188/186)Re,~(99)Tc~m)化合物的生物标记及应用

fac-[Μ(CO)_3]~+(Μ=~(188/186)Re,~(99)Tc~m)具有良好的放射生物学特性,是一种很有发展前途的标99记前体。本文综述了fac-[Μ(CO)3]+(Μ=188/186Re,Tcm)核标记生物小分子(生物素、雌激素……)、大分子蛋99白及多肽的研究进展,并探讨了其今后发展的方向。     

RDX含量对NC－DBP－RDX体系流变性和弹性效应的影响

运用Ｉｎｓｔｒｏｎ３２１１型毛细管流变仪研究了ＲＤＸ含量在０～４６．９％范围内，在不同温度下对ＮＣ－ＤＢＰ－ＲＤＸ体系流变性的影响，得到了各种流变规律；同时利用公差显微镜研究了ＲＤＸ含量在８０℃下对该体系弹性效应的影响规律。     

新型啤酒稳定剂对啤酒蛋白质吸附特性的研究

研究了新型啤酒稳定剂BFSA对啤酒蛋白质的吸附特性,初步探讨了BSFA吸附蛋白的作用机理。FT-IR图谱分析可知,BFSA表面含有Si-O-Si键,且含有O-H键。研究了时间、温度、蛋白质浓度对BFSA吸附的影响,发现吸附平衡时间在1 h左右,BFSA吸附啤酒蛋白质量随温度的降低而升高,随着初始蛋白质浓度的升高而升高。研究了BFSA吸附啤酒蛋白质的吸附等温线、动力学和热力学模型,发现BFSA对啤酒蛋白质的吸附等温线更符合Freundlich方程;对啤酒蛋白质的吸附过程更符合准二级动力学方程;由热力学参数ΔG0说明啤酒蛋白质在BFSA表面的吸附为非自发的,ΔH0说明吸附过程是放热的,ΔS0说明吸附是熵减过程;活化能(E)为26.28 kJ/mol表明BFSA吸附啤酒蛋白质是物理吸附;吸附过程放热为6.62 kJ/mol表明该吸附过程的主要作用力可能是范德华力、氢键和疏水作用。     

直接亲核放射氟化法合成O-(2-[18F]氟乙基)-L-酪氨酸

本文利用一种方便易得的前体N-叔丁氧羰基-(O-(2-对甲苯乙氧基))-L-酪氨酸甲酯,采用"一步法"直接亲核放射氟化法合成了O-(2-[18F]氟乙基)-L-酪氨酸.采用易于自动化的固相萃取法代替比较耗时的高压液相色层法分离目标产物,简化了制备过程,缩短了总合成时间.放射化学产率约为40%(未经衰变校正),放射化学纯度大于97%,合成时间小于50 min.     

Analysis of Lard’s Aroma by an Electronic Nose for Rapid <Emphasis Type=Italic>Halal</Emphasis> Authentication

An electronic nose was successfully used to detect and discriminate lard from other types of animal body fats and samples containing lard. The results are presented in the form of VaporPrint™, the image of the polar plot of the odor amplitudes from the surface acoustic wave (SAW) detector frequency. In the VaporPrint™, the radial angles representing the sensor provides individual fingerprints of the aroma of different animal body fats. Principal component analysis (PCA) was used to interpret the data and it provided a good grouping of samples, with 61% of the variation accounted for by PC 1 and 29% accounted for by PC 2. All of the lard-containing samples formed a separate group from the samples that were free from lard. This method can be developed into a rapid method for detecting the presence of lard in food samples for Halal authentication.     

Multisensor Fusion: An Autonomous Mobile Robot

A conventional autonomous mobile robot is introduced. The main idea is the integration of many conventional and sophisticated sensor fusion techniques, introduced by several authors in recent years. We show the actual possibility of integrating all these techniques together, rather than analyzing implementation details. The topics of multisensor fusion, observation integration and sensor coordination are widely used throuhout the article. The final goal is to demonstrate the validity of both mathematical and artificial intelligence techniques in guaranteeing vehicle survival in a dynamic environment, while the robot carries out a specific task. We review conventional techniques for the management of uncertainty while we describe an implementation of a mobile robot which combines on-line heterogeneous sensors in its navigation and localisation tasks.     

PBH/PP及PBH/CaCO_3/PP共混改性研究

采用自制的负载钛催化剂[TiCl4/MgCl2-Al(i-Bu)3],合成了1-丁烯-1-己烯共聚物(PBH)。用己烯摩尔含量为2%、7%、20%的PBH对PP进行共混,研究了共混物的力学性能;以己烯初始摩尔含量为30%的PBH作为CaCO3的载体,填充PP,并与未采用载体的CaCO3填充体系进行比较。结果表明:随着PBH含量的增加,在共混物拉伸强度、弯曲强度、硬度有一定下降的同时,冲击强度则明显提高,己烯摩尔含量大的PBH增韧改性PP的效果更好;以PBH作为载体的CaCO3,随着其含量的增加,共混物的冲击强度明显增大,而拉伸强度、弯曲强度、硬度却有一定程度的下降。与无PBH载体CaCO3填充PP的规律明显不同。