Nanoencapsulation of capsaicin by complex coacervation of gelatin,acacia, and tannins

Using gelatin and acacia as wall and capsaicin as core substance, nanocapsules were prepared by mixing two solutions of oppositely charged polymers, and then treated by hydrolysable tannins. The morphology and size distribution of the nanocapsules were analyzed by transmission electron microscope and laser particle size analyzer, respectively. The nanocapsules had a mean diameter of 300–600 nm, with mean drug loading content (20.81%) and encapsulation efficiency (81.17%) with good dispersion and spherical morphology. The interaction between gelatin and tannins is discussed in the article. Moreover, the addition of hydrolysable tannins in the system had an important influence on the morphology and particle distribution of the nanocapsules because of the synergistic actions of hydrogen bonding and hydrophobic effects. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 2225–2229, 2005     

异域科技审判法庭的设计与实现

基于法院专网整合各地域科技审判法庭系统,通过网络SQL数据库配置分配角色,利用SOAP进行远程控制,构建RTP/RTSP流代理服务模型,灵活组建一个完整的异域庭审平台,平台最大特点是:屏蔽角色地域差异,让各角色专注于庭审活动过程而不必在意地域分布.该模式具备极强的资源整合特性,可提高庭审效率、节约庭审经费.     

基于谐振型SAW传感器的呼吸检测系统设计

人呼吸中VOCs的种类及含量与人的身体状况有关,对其的检测可用于疾病的诊断.本研究利用谐振型声表面波传感器,开发出一套可用于对人呼吸中VOCs进行检测的系统.本文首先介绍了该系统的组成及原理,并对系统的关键环节进行了测试.在此基础上,系统对多组测试样本进行了实验,实验结果初步表明,本系统可对×10-9(ppb)级的VO...     

De-emulsification of 2-ethyl-1-hexanol/water emulsion using oil-wet narrow channel combined with low-speed rotation

Low-speed rotation of disc in an internal circulation of a novel de-emulsification with rotation-dise horizental contactor (RHC-D) realized de-emulsification for O/W emulsions due to repeated coalescence in oil-wet narrow channels at a low rotation speed. For three emulsions included ethanol/water/2-ethyl-1-hexanol, ethanol/water/2-ethyl-1-hexanol/SDS (Sodium Dodecyl Sulfonate) and 2-ethyl-1-hexanol/water/SDS emulsion, deemulsification ratios of oil phase could reach 1, 1 and 0.67 respectively at 170 r·min^-1, and de-emulsification ratios increased obviously after agitating 10 min. De-emulsification experiment in the seam indicated that oil droplet sizes in O/W emulsion became larger after de-emulsification. The main de-emulsification mechanism in RHCD was the coalescence of oil droplets in oil-wet narrow channels. With increase of the rotation speed, oil droplets dispersed better in the aqueous phase. However, de-emulsification effect enhanced due to the increase of the coalescence rate at a bit higher rotation speed. In addition, internal circulation made those O/W emulsions to be broken repeatedly, consequently de-emulsification ratio increased. Repeated de-emulsification through internal circulation might make continuous extraction of ethanol come true at a low rotation speed.     

气体放电灯对电路的谐波污染

气体放电灯是电流控制的非线性电路元件（如图１）。它工作在弧光放电区，是下降的伏安特性。必然产生弛张振荡，是一个谐波源。在电路各谐波采集点采集谐波样本，用记忆示波器记录波形，用谐波分析仪分析样本，其ＴＨＤｕ、ＴＨＤｉ、ＨＲ等都严重超标。可见若大量采用气体放电灯而不采取必要措施，就会给电路带来谐波污染，影响公用电网的供电质量。本研究采集的谐波样本，可用于谐波污染的在线检测和适时控制     

LED屏幕夜间光污染监测与评价研究

随着城市中LED的广泛应用,周围居民光污染事故的投诉也逐渐增多,但光污染的监测、评价仍无定量分析。结合LED光污染的特点,制定了夜间LED光污染监测方案,在沈阳市选取六个有代表性区进行LED的光污染状况监测。通过测量夜间LED屏幕的光污染情况,分析影响夜间光污染的主要因素,结果表明:距离、环境光照、角度、LED屏幕面积、照度等对LED光污染有直接影响。基于监测分析,建立LED评价指标体系,并以人体感官为基准将光污染强度分为:严重、较严重、一般、轻微、无影响。最后,分析沈阳市典型居住区夜间LED光污染程度和范围,为定量评判LED光污染程度和制定相关法律法规提供一定的理论依据。     

碳纳米杂化材料的分散性及分散稳定性研究

将酸化石墨烯、羟基化多壁碳纳米管通过超声离心等物理方法合成碳纳米管/石墨烯杂化材料以及用化学多步法合成碳纳米管/石墨烯杂化材料,按照0.1 mg/m L分别分散于四氢呋喃溶剂中超声72 h制备碳纳米材料的分散液,并将分散液静置24 h。通过紫外光谱证明所用碳纳米杂化材料已成功合成,同时通过紫外光谱、显微镜扫描和沉淀实验表征碳纳米材料的分散性及分散稳定性。结果表明,相比于碳纳米管、石墨烯和物理法合成碳纳米管/石墨烯杂化材料,化学多步法合成的碳纳米管/石墨烯杂化材料具备更优异的分散性及分散稳定性,这要归因于分散好的碳纳米管先与聚丙烯酰氯反应,以初步抑制碳纳米管的团聚,其次将其再与石墨烯反应,这样碳纳米管和石墨烯就通过聚丙烯酰氯连接在一起,构建出三维结构,抑制碳纳米管的重新团聚和石墨烯片层的叠加。     

2-氯甲基-3，5-二甲基-4-甲氧基吡啶盐酸盐的高效液相色谱分析

用固定相为十八烷基硅烷键合硅胶的C18液相色谱柱,以PDA检测器对2-氯甲基-3,5-二甲基-4-甲氧基吡啶盐酸盐进行了高效液相色谱分离,选用乙腈与缓冲液（磷酸氢二钾与磷酸二氢钾质量比为1．36：013,pH=6．8）体积比45：55作为流动相,检测波长204mn。该法相对标准偏差1．38％,回收率达99．8％。     

石墨烯改性环氧树脂/碳纤维复合材料拉伸性能的研究

通过H2SO4/HNO3混酸酸化石墨烯,并用硅烷偶联剂KH-560接枝酸化的石墨烯,然后将处理好的石墨烯均匀的分散在环氧树脂中,制备高性能的环氧树脂/碳纤维复合材料。通过红外光谱(FTIR)、热失重(TG)、透射电子显微镜(TEM)等分析方法对处理的石墨烯的表面官能团及表面形貌进行表征,用DCW-7拉伸试验机对所制得的复合材料进行测量。结果表明:酸化的石墨烯表面成功地接枝上了一定量的硅烷偶联剂KH-560,在树脂体系中添加2%的硅烷偶联剂KH-560处理的石墨烯的复合材料的拉伸强度提高了10.7%,断裂强力提高了10.4%。     

含氟聚合物的功能性应用开发

介绍了含氟聚合物在液相、气相、生物医药等膜分离领域,太阳能电池背板、超级电容器的粘结隔膜材料、锂离子电池用粘结剂隔膜材料等新能源领域,以及驻极体材料、噪音和振动控制用材料介电材料等领域的功能性开发的应用情况,认为应不断降低生产和制造这些功能性材料与制品的成本,使之在更多的领域发挥重要的作用。