浅谈高校基础投资成本的全过程控制

高校基本建设项目的投资成本发生在项目建设的各个过程之中。项目建设的全过程都应该控制投资成本。在可行性研究和设计等前期,应该执行限额设计的目标管理制度。在施工期间应该严格执行合同,对工程签证、工期等实行严格控制。付款方式也是投资成本控制的有效手段。     

Preparation of carbon nanotubes/hydrogenated nitrile rubber composite by ultrasonic technique

将低相对分子质量的液体氢化丁腈橡胶(HNBR)溶于丙酮溶剂中,加入碳纳米管,用超声波技术制备了液体HNBR与碳纳米管的复合母料,然后再与HNBR混炼、硫化,获得碳纳米管/HNBR复合材料.结果表明,碳纳米管在HNBR中分散性好,对HNBR有较好的增强性,但在后期机械加工中产生了断裂.     

化工项目环境影响评价工程分析的思考

本文通过实例分析,对化工项目环境影响评价工程分析的内容、方法等进行探讨.根据化工项目的特点,提出化工项目环境影响评价工程分析必须增加的内容和重点,以及在工程分析方法上要注意的问题.     

电泳涂料

本文介绍了电泳涂料及发展趋势。     

工业废渣在复合无光乳浊釉中的应用

以废瓷粉、废玻璃粉、粉煤灰等工业废渣为主要原料．添加其它常用的陶瓷原料，成功研制出乳白色、彩色(添加色料)、费色(以粉煤灰着色)三个系列无光乳浊釉。这些釉的烧成温度为1180℃左右，烧成气氛为氧化气氛．它们具有废渣用量大(废渣总用量40-50％)、熔块用量低(0～12％)、成本低等特点。     

A spectroscopic study of the self-association and inter-molecular aggregation behaviour of pH-responsive poly(l-lysine iso-phthalamide)

The pH mediated intra-molecular association and inter-molecular aggregation of a range of amphiphilic poly(l-lysine iso-phthalamide) polymers have been investigated in aqueous solution over a range of pH values and concentrations. The desired functionality of these novel bioresponsive amphiphilic polymers was achieved by incorporating pendant hydrophilic carboxyl groups along the polymer backbone, via the l-lysine moiety, balanced by a degree of hydrophobicity introduced via the iso-phthaloyl moiety. Incorporation of low levels of bis-functional Cy3 (poly-Cy3) and/or Cy5 dye (poly-Cy3/5 or poly-Cy5) co-monomers in the responsive polymer backbone allowed detailed probing of the pH mediated hydrophobic association using a combination of optical spectroscopic techniques. Both steady-state fluorescence spectroscopy and fluorescence lifetime measurements of poly-Cy3 revealed a conformational transition at pH 4.5. Thus, below a critical pH the polymer collapsed into a compact globular structure (hypercoil) bringing the fluorophore molecules into close proximity with one another. This resulted in a dramatic reduction in fluorescence intensity and fluorescent lifetime in the single fluorophore systems (poly-Cy3) accompanied by a red shift in the maximum emission wavelength. Observed redshifts in the emission maxima and enhancements of fluorescent lifetimes with increasing polymer concentration suggested the formation of polymer aggregates. Fluorescence resonance energy transfer (FRET) was measured in mixtures of single fluorophore containing poly-Cy3 (donor) and poly-Cy5 (acceptor) and dual fluorophore containing poly-Cy3 (donor)/Cy5 (acceptor) in an effort to distinguish between intra-molecular versus inter-molecular association. The relevance of the results with respect to potential in vivo applications (drug delivery and biodiagnostics) is discussed.     

使用毛细管电泳定量分析黑白显影液衰退反应中的对苯二酚和对苯二酚单磺酸盐

使用毛细管电泳分离并定量分析了对苯二酚——— 1种黑白显影液中的显影剂和它的衰退反应产物对苯二酚单磺酸盐。优化了的毛细管电泳分离。     

Synthesis and characterization of cleavable surfactants derived from poly(ethylene glycol) monomethyl ether

A series of noncyclic acetal-linked cleavable surfactants were simply prepared by condensation of aldehydes with poly(ethylene glycol) monomethyl ethers. All of the products were characterized by¹H nuclear magnetic resonance. Their hydrophile-lipophile balance, surface tension, cloud point, critical micelle concentration, and foam height were determined. Hydrolysis kinetic studies, followed by gas chromatography, showed that they had higher hydrolytic reactivity in acidic solution than cyclic acetal-linked cleavable surfactants.     

UCC项目靠的是天时地利人和——访中国建材装备有限公司总经理方芳

装备公司是我国最早走向国际市场的水泥设备供应商,上世纪90年代初,由装备公司出口马来西亚的日产2000吨水泥成套设备项目,是我国当时出口的单线规模最大的生产线;1993年到1996年,出口巴基斯坦两条日产2000吨的幸运水泥厂,又是当时我国出口最大规模的水泥厂。     

Catalytic activities and properties of mesoporous sulfated Al2O3–ZrO2

Mesoporous sulfated Al₂O₃–ZrO₂ (MSAZ) catalysts with large surface areas and pore volumes after calcination at high temperature (650 °C) and with higher Al₂O₃ content than 20wt% were successfully prepared from a template of block copolymer (P84). The MSAZ catalysts were characterized by X-ray diffraction (XRD), N₂ adsorption, transmission electron microscopy (TEM), ²⁷Al magic-angle spinning nuclear magnetic resonance (MAS NMR), thermogravimetric analysis (TG–DTG), temperature-programmed desorption of ammonia (NH₃-TPD) and infrared spectra (IR) of adsorbed pyridine. It is shown that the resulting mesostructured sulfated Al₂O₃–ZrO₂ samples have a well-developed textural mesoporosity. The number of acid sites present on MSAZ catalysts is higher than that on conventional sulfated zirconia, and the former catalysts are more active than the latter one for various acid-catalyzed reactions.