Impact of dissolved humic acid on the bioavailability of acenaphthene and chrysene assessed by membrane-based passive samplers

Dissolved organic carbon (DOC) is known to reduce the bioavailability of hydrophobic organic compounds (HOCs) in aqueous environments. This reduction occurs as a result of adsorption to DOC, apparently reducing the freely dissolved concentration of HOCs. In the present study, triolein-embedded cellulose acetate membrane (TECAM) and Japanese medaka (Oryzias latipes) were used to measure the uptake of acenaphthene and chrysene in the presence of commercial humic acid (HA) at different concentrations (0―15 mg C·L-1) under controlled laboratory conditions. Apparent uptake rate constants for PAHs in TECAM and medaka were compared and DOC-water partition coefficients (KDOCs) of two PAHs were calculated with different sampling methods by model fit. Results showed that HA present in water significantly reduced the uptake of PAHs in TECAM and medaka. The obtained values of log KDOC of acenaphthene and chrysene measured by TECAM were 4.63 and 5.83, respectively, whereas biologically determined values were 4.52 and 5.76, respectively. These log KDOC values were comparable to earlier published KDOCs toward commercial HA, thereby indicating that TECAM accumulated only the freely dissolved fraction of chemicals and uptake PAHs in a manner similar to that of fish. All these results suggested that the TECAM method can provide a good means for assessing the impact of DOC on bioavailability of PAHs in the aqueous environment.     

Prediction of Anthropometric Dimensions Based on Grey Incidence Analysis and ANFIS

In order to select the efficient input variables of adaptive ncuro-fuzzy infence system （ANFIS）during the prediction anthropometric dimenions, grey incidence （GI） analysis, as a mastic method that ranks the sequence of of lots of variables in complicated factors has been applled.According to the prediction accuracy （A） between the predicted values and actual measured values, the ANFISG1 model with the parameters selected by using the GI analysis were more correct and effective than those done by multiple regression model and the model with input parmeters nonelected. The model prediction accuracy △Regrauskn= 0.804 7〈 △ANE3CI=0.9725, which proves the nodel with few parameters is more correct and effective than the other merits.     

生物材料应用于脊髓损伤修复的研究进展

脊髓损伤是人类致残率最高的疾患之一。治疗脊髓损伤的趋势是联合应用多种技术和手段,创造出最适宜神经细胞再生恢复的环境,达到功能恢复的目的。生物材料在结构和功能上的优良性质使得它在脊髓损伤和修复中具有很好的应用前景。近年来兴起的组织工程学方法更为脊髓损伤的治疗带来新思路,即通过种子细胞—支架材料—神经营养因子复合物修复受损脊髓。本文回顾了近年来组织工程支架和细胞载体系统在脊髓损伤修复中的应用,展示了生物材料在组织工程和细胞分子治疗策略中的优越性。     

20世纪90年代以来国内外自尊研究的新进展

20世纪90年代以来，国内外自尊研究出现了一些新进展，主要表现在：（1）特质自尊与状态自尊、能力维度与价值维度的区分；（2）内隐自尊研究的逐步兴起；（3）自尊测量研究的新突破；（4）自尊相关研究的不断拓展。这些为我们研究自尊提供了新的观点和视角。     

时尚：一种文化符号的体现

时尚既是一种流行的符号模式，也是一种文化内涵的表现形式。时尚是社会的时代符号，它在流行的过程中深受社会文化的影响。文化蕴于时尚当中，时尚体现着文化的意涵。     

半导体热电材料Bi2Te3膜的电化学制备

研究了不同沉积电位对电化学生长半导体热电材料Bi2Te3膜沉积过程、膜形貌、结晶性及相结构的影响。利用I-V循环扫描曲线分别研究了纯Bi3 、纯Te4 及其两种离子的混合溶液电化学特性;应用扫描电子显微镜(SEM)、X射线衍射(XRD)、电子能谱(EDS)对膜的微观表面形貌、相结构及成分进行了表征。研究表明:生长的样品为斜方六面体(rhombohedral)晶体结构的Bi2Te3,薄膜表面平整致密,为明显的柱状晶结构,具有(110)择优取向;沉积电位越接近还原峰最大电流处,膜的生长电荷效率越高,薄膜结晶性也越好。     

区域金融发展差异及对新兴经济区的影响

指出当前区域经济竞争中，金融资源向先发区域集聚的“马太效应”El益显著。长三角和珠三角已经成为全国性金融中心，位于两大先发区域之间的新兴经济区——海峡西岸经济区与之相比存在较大的发展差距。运用因子分析法和威尔逊模型进行研究，结果表明，海西金融存量水平较低，中心城市金融辐射能力较弱。提出为缩小与先发区域的发展差距，新兴经济区需有效提高中心城市的经济总量，合理制定差异化竞争战略，同时加强区域合作借力发展的建议。     

基于Rhapsody实时框架的操作系统适配过程的分析与研究

该文介绍了Rhapsody环境下基于OXF实时框架的操作系统适配原理及过程,分析了通过OXF进行模型调试的原理.     

企业家的经济贡献

主要从企业家对企业主体地位的实现 ,对企业资源的优化配置 ,对企业利润目标的实现 ,对现代企业制度的建立和企业产业升级五个方面分析了企业家对企业的经济贡献     

氮氧化物储存还原反应中还原时间的控制方法

使用H_2作为还原剂,采用NO_x存储还原循环的试验方法,在石英反应器上研究了还原时间、反应温度和还原剂体积分数对NO_x存储还原(NSR)催化剂Pt/Ba/Ce/γ-Al_2O_3存储还原特性的影响.结果表明:存在一个最佳还原时间,在此处可取得最高的循环转化率;最佳还原时间与反应温度和还原剂体积分数相关,提高反应温度或者降低还原剂体积分数,最佳还原时间延长.