Modification of poly(ethylene oxide) electrolyte by Brönsted base terminated oligo(ethylene glycol) and its application in dye-sensitized solar cells

Oligo(ethylene glycol) terminated by pyridine derivatives was designed and synthesized for improving the performance of the dye-sensitized solar cells (DSCs) with poly(ethylene oxide) based electrolyte. Effects of the plasticizer on retarding the recombination reaction in DSCs were characterized by current density–voltage characteristics. Combined with the results on electron density measurements, photovoltage–intensity characteristics correlate the retarded electron recombination with the upward movement of the conduction band edge and the reduced order of recombination reaction. The increased electron lifetimes of the DSCs with plasticizer modified electrolyte were confirmed by a small perturbation voltage decay technique. Additionally, WAXS measurements show that the presence of the plasticizer decreases the crystallinity of PEO electrolyte, which facilitates the mass transport of the redox species as impedance spectra indicated. By introducing guanidinium thiocyanate into the plasticizer modified PEO electrolyte, the performance of the DSCs is further improved, which yields the highest efficiency of 3.5%.     

CCD-1型直读发射光谱仪测定页岩气中的硼

本文以焦硫酸钾、氟化钠、三氧化二铝和碳粉为固体缓冲剂,单次摄谱内标法直读发射光谱法测定页岩气中的硼。该方法检出限为0.80μg/g,测定范围为0.80~1000μg/g,用岩石国家一级标准物质(GSR-4)和(GSR-5)验证,方法的精密度RSD%分别为6.34%和7.24%,准确度|△logC|分别为-0.004和-0.001。该法分析程序快速、准确、无污染,满足了页岩气中硼的分析要求。     

未来水处理技术——膜生物反应器

着重介绍了膜生物反应器及其在造纸废水处理中的应用效果，同时在某纸厂封闭水循环系统中对膜生物反应器进行了中试。     

浅析基本电费的两种计费方式对真空制盐企业电费的影响

本文对大工业用电企业基本电费的两种计费方式进行了详尽的分析,企业可以根据自身用电实际及装机容量,合理选择经济的计费方式,尽可能在电力行业供电营业规定允许的范围内使本企业基本电费的支出减至最低。     

倾斜板制备半固态7A09合金坯料的研究

以浇注温度、倾斜板预热温度、倾斜角度为研究因素,进行了倾斜板法制备7A09合金半固态坯料的正交实验。结果表明,浇注温度660℃,倾斜板预热温度150℃,倾斜板倾斜角度60°是较为理想的工艺参数;浇注温度是晶粒细化最主要的影响因素;控制合适的工艺参数可获得细小、均匀的初生相颗粒。     

Synthesis and characterisation of fluorescent pyrene‐end‐capped polylactide fibres

Fluorescent markers are critical for tracking the position and movement of molecules both in vivo and in vitro. Conventionally, synthetic dyes are non‐covalently added to polymers for fluorescent tracking, but often diffuse away. Here we demonstrate, for the first time, a facile method for the synthesis of fluorescent poly(lactic acid) nano‐/microfibres for biomedical applications using solution spin blowing. Pyrene‐end‐capped poly(l ‐lactide) (PLLA) derivatives were synthesised using the ring‐opening polymerisation of l ‐lactide and they were characterised using spectroscopic and thermal analyses. Submicrometre‐sized fluorescent fibres were produced from these PLLA derivatives using solution blow spinning techniques generating polymer blends and core–shell fibres. Such system could be further exploited to incorporate electrically conductive carbon allotropes via the pyrene aromaticity, producing fluorescent and electrically active fibres for in vitro monitoring and electrical stimulation. © 2018 Society of Chemical Industry     

花色苷在体内的药理活性及其作用机制研究进展

花色苷是一类广泛存在的多酚类色素,是果蔬呈现靓丽色彩的来源。近年来相关的研究报道显示出花色苷具有多种药理活性。抗氧化活性被认为是花色苷具有健康益处的关键所在,如抗炎症、抗肥胖、抗癌、降血糖等,这使得花色苷在食品领域作为安全有效的天然色素、营养品、保健品以及药品的天然植物来源都具有相当大的开发潜力。但是,花色苷的药理活性在机制方面的研究还比较欠缺,有待更详细和深入的探讨。文章主要总结归纳了近年来花色苷在抗癌、保护心血管、降血糖、降血脂和在神经退化症等方面的研究成果,为今后探索相关作用机制提供借鉴。     

高压配电室(有充油设备)建筑设计

结合某矿山有充油设备的高压配电室建筑设计,对其建筑的屋面、墙体、承重结构、防火分区等设计的心得和体会。     

Broadband circularly polarized patch antenna with gap‐coupled feed and resistor loading

A broadband circularly polarized patch antenna with suspended structure is proposed. The suspended patch has a bow‐tie structure and a gap‐coupled feed. By connecting a resistor load to another gap‐coupled feed port at the opposite position, a wide impedance and axial ratio (AR) bandwidths are obtained. The proposed design has a very simple antenna structure with an impedance bandwidth of 44.5% and a 3‐dB AR bandwidth of 33.8%, respectively. The results show that the bandwidth of the patch antenna is successfully broadened using the suspended configuration, gap‐coupled feed, and resistor loading. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:587–593, 2014.     

聚丙烯珠粒发泡研究进展

聚丙烯(PP)珠粒发泡材料具有优异的耐热、隔音、抗冲击以及耐化学腐蚀等性能,近年来被广泛应用在包装、建筑、汽车等行业。PP在其熔点温度附近的熔体强度会急剧下降,低熔体强度导致其难以得到好的泡孔结构,所以PP珠粒发泡的技术难度大,目前只有少数国家掌握了PP珠粒发泡的技术,因此PP珠粒发泡的研究受到了国内外的广泛关注。文中从制备工艺、发泡装备、性能改进、表征方法等方面综述了近年来国内外PP珠粒发泡的研究动态,并对该领域今后的研究方向进行了展望。