Carbon nanotube networks on different platforms

Carbon nanotube (CNT) networks are an emerging class of material with potential applications that range from biotechnology to sensors. However, the design and fabrication of CNT networks with specific properties necessitates a deep understanding on how a variety of factors affect the performance of these materials. Of particular interest is how the substrate on which the CNT networks are assembled also influences on the applicational aspects of the CNT network. In this review, we overview the variety of substrates reported as CNT networks supports, and the different applications of these networks. Substrates can be varied from rigid to flexible to porous materials. Interestingly, the method of network preparation and the nature of the scaffold have a direct influence on the properties and the potential applications of the final material.     

双酚A在膜生物反应器中的去除及转化分析

通过小试考察了MBR去除双酚A(BPA)的机理及转化规律。结果表明,BPA的加入未对MBR的运行产生明显影响。随着MBR运行压力的升高,出水BPA含量呈现下降的趋势。出水初期平均压力为4.8 kPa,出水平均BPA的质量浓度为3.98 mg/L,运行后期出水平均压力为46.4 kPa,出水平均BPA的质量浓度为1.67 mg/L。对反应池内污泥、膜清洗洗脱液中BPA的检测发现,BPA在反应池内污泥、膜滤饼层和凝胶层中具有很高的含量分布。BPA的3种主要降解产物在反应器中的含量与出水含量相差不大,但在膜面的凝胶层和滤饼层中有一定程度的积累。在70 d的运行时间内,MBR去除BPA的主要机理是膜面滤饼层和凝胶层通过截留已吸附BPA的污泥而形成强化去除作用。只有部分BPA通过生物降解作用转化为其产物,生物降解作用在本研究中属于次要地位。     

直角坐标多级后投影聚束SAR成像算法

在局部极坐标系下,快速多级后向投影算法(FFBPA)可以以较低的采样率对子孔径成像,但在不同局部极坐标系之间需大量的2维图像域插值实现图像融合。相比极坐标系,图像融合在直角坐标系下更容易实现。但在直角坐标系下进行子孔径成像的奈奎斯特采样率较高,这将影响直角坐标系下的成像效率。该文针对此问题提出一种谱压缩技术,通过对距离时域和距离频域两次补偿,大幅压缩了直角坐标系下子孔径成像的方位谱宽度。该文算法具有堪比原始后向投影算法(BPA)的成像质量和优于FFBPA的计算效率,且能够应用于非线性轨道SAR。最后通过星载0.1 m仿真实验和机载0.2 m实测实验验证了算法的有效性。     

巯基化树脂在双酚A生产中的应用前景

巯基化树脂催化剂用于双酚A生产,易被原料苯酚中的杂质中毒,而且在较高的介质温度下碳酸基流失明显,采用保护树脂对原料苯酚纯化预处理,并选择耐温性能较好的脂做催化剂基体,巯基化催化剂的使用寿命可大大延长,巯基化催化剂用于双酚A工业生产成为可能。     

新显色剂三溴偶氮溴膦与钡显色反应的研究

研究了新试剂三溴偶氮溴膦（4－BPA－TB）与钡（Ⅱ）的显色反应。本法可用于人发中微量钡的测定。     

酸吸收工艺在离子法双酚A生产中的运用

采用弱碱性离子交换树脂过滤器吸收离子法双酚A工艺生产过程中产生的游离酸来减少双酚A高温分解 ,提高双酚A的色泽与纯度 ,降低了装置的腐蚀程度 ,实现了优质生产的目的 ,对过滤器的再生洗涤工艺也进行了介绍。     

探讨分子印迹电化学传感器对双酚A的检测

利用分子印迹技术(MIT),以双酚A(BPA)为模板分子,邻氨基苯硫酚(ATP)为功能单体,通过自组装和电聚合方法制备双酚A分子印迹聚合膜电化学传感器,采用循环伏安法和交流阻抗法进行表征,并用于双酚A的检测,该研究结果为电化学聚合法制备分子印迹聚合膜,根据功能单体与模板分子的相互作用正确选择功能单体提供了理论基础。     

欧盟内分泌干扰物监管法规研究

内分泌干扰物问题近年来已成为全球性的焦点问题。本文综述了欧盟有关内分泌干扰物的化学品监管法规,并指出欧盟未来对于内分泌干扰物的监管趋势。     

基于知识库的BPA二次开发

对于现代电力系统,采用N-2原则进行电力系统稳定分析的难度不断地在加大,采用人工方式进行预想事故预演,即费时费力又容易产生遗漏。研究N-2安全稳定计算分析软件与现有BPA软件无缝衔接,引入知识库系统,识别电网中最为严重的事故以及可能存在的薄弱环节。在保证了仿真覆盖范围的前提下,大大地减少了仿真案例的数目,缩减了系统的仿真时间,实现了对电网的快速仿真。     

Actions of Bisphenol A on Different Feto-Maternal Compartments Contributing to Preterm Birth

Preterm birth remains to be one of the most prevalent obstetric complications worldwide. Since there are multiple etiological factors associated with this disease process, an integrative literature search in PubMed and Scopus databases on possible mechanism of action and effect of bisphenols on exposure on human or animal placental samples in preterm birth was conducted. From 2332 articles on initial literature search, 63 studies were included for full data extraction. Altogether, several pathways were shown to be possibly affected by bisphenols, leading to dysregulations in structural and endocrine foundation in the placenta, potential induction of senescence and failure of decidualization in the decidua, and possible propagation of inflammation in the fetal membranes. Combined, these actions may eventually counteract bisphenol-induced relaxation of the myometrium and promote contractility alongside fetal membrane weakening. In totality, these individual impairments in gestation-critical processes may lead to failure of maintenance of pregnancy, and thus effecting preterm birth.