| 1 | 耐火材料技术的近期发展显示文摘近十年来耐火材料技术取得了很大发展。在各种结合剂和原料方面开发了新型系列产品。特别在不定形耐火材料方面取得了一些重要进展,这些进展不仅表现在原材料方面,而且也表现在施工工艺方面:炼钢使用碱性耐火砖的主要技术进步是采用了溅渣护炉工艺。通过溅渣护炉,将新形成的渣覆盖在炉墙表面,使得碱性氧气转炉的炉龄大为提高,一般在冶炼几千炉后才需重新筑衬.在不定形耐火材料技术方面,开发了几种新型的结合剂和依靠泵送这样的机械手段进行快速施工的工艺。新的结合剂也有助于简化养生、干燥和烘烤工艺,缩短了小修时间。这些耐火材料及其快速的施工工艺(包括初始施工和修补),有助于炼钢生产者缩短小修时间:文章着重介绍无水泥结合剂和特殊配方的低水泥产品。 | Subrata Banerjee 姚金甫(译) 杜锋(校) | 2005 | 世界钢铁2005，5，5： | 3 |
| 4 | Efficacy of Limonia acidissima L.(Rutaceae) leaf extract on larval miniatures of Culex quinquefasciatus Say 1823显示文摘Objective:To investigate the role of leaf extract of Limonia acidissima L.(Rutaceae) as a biocontrol agent against the larval form of Culex quinquefasciatus,and characterization of bioactive component responsible for larvicidal activity.Methods:Larval mortality of mosquito species was observed after 24,48 and 72 hours of exposure to different concentrations of aqueous extract,solvent extract and subsequently bioaclive compound.The bioaclive compound was subjected to IR and GC-MS analysis.Results:Mortality rale al 3%concentration of crude extract were highest(90%) amongsl all concentrations tested and subsequently highest(95%) mortality was achieved in chloroform:methanol extract at 100 ppm concentrations.IR and GC-MS analysis of bioaclive compound revealed the presence of steroid compound which may act as larvicide. Conclusions:The chloroform:methanol extract of mature leaves of Limonia acidissima was found to exhibit considerable mosquito larvicidal activity against Culex quinquefasciatus. | Siddharthasankar Banerjee Someshwar Singha Subrata Laskar Goutam Chandra | 2011 | Asian Pacific Journal of Tropical Medicine2011，4，9： | 0 |
| 5 | Well-Defined Fluorinated Copolymers:Current Status and Future Perspectives显示文摘Well-defined fluoropolymers exhibit unique properties such as excellent oil and water repellency,satisfactory thermal stability,a low refractive index,and low surface energy.The origin of these properties is attributed to the presence of a strong electronegative and low polarizable fluorine atom in the backbone of such polymers,which leads to a strong C−F bond(with a high bond dissociation energy of 485 kJ mol−1).Because of these features,these polymers have found applications as functional coatings,thermoplastics,biomedical items,separators,and binders for Li ion batteries,fuel cell membranes,piezoelectric devices,high-quality wires and cables,and so forth.Usually,fluoropolymers are synthesized by the conventional radical(co)polymerization of fluoroalkenes,which leads to the production of(co)polymers with an ill-defined end group,uncontrolled molar mass,and high dispersity values.In the last two decades,significant developments of various reversible deactivation radical polymerization(RDRP)techniques have helped the design of macromolecular architectures(including block,graft,star,and dendrimers)on demand.However,for relevant new applications,well-defined fluoropolymers with controlled macromolecular architectures(e.g.,block copolymers as thermoplastic elastomers and electroactive polymers or graft copolymers for fuel cell membranes)are required.Several RDRP methods,developed in the last two decades,have paved the way for the synthesis of(co)polymers with well-defined molar mass,dispersity,chain end-functionality,and macromolecular architectures.Some of these RDRP techniques have been successfully employed for the synthesis of well-defined fluorinated copolymers.These techniques include iodine-transfer polymerization(ITP),reversible addition−fragmentation chain-transfer(RAFT)polymerization,organometallic-mediated radical polymerization(OMRP),and,to a lesser extent,nitroxide-mediated polymerization(NMP).Impressive control of the molar mass parameters of the fluoropolymers synthesized via these techniques also encouraged the researchers to combine these techniques with other postpolymerization strategies,leading to innovative novel polymeric materials.Thus,synthesized well-defined fluoropolymers exhibited a unique combination of properties(such as excellent weather resistance,high thermal/chemical/aging resistance,morphological versatility,and a low dielectric constant/flammability/refractive index).These led to the application of such developed materials in various high-technology applications such as high-performance elastomers,coatings for marine antifouling applications,fluorinated surfactants,fuel cell membranes,and gel polymer electrolytes for Li ion batteries.Newer advances in the field of polymer synthesis techniques are the need of the hour in order to synthesize more advanced fluorinated materials which may change the use of such polymers in engineering and biomedical fields in the current century.However,it should be kept in mind that success in this regard shall heavily depend on a deeper understanding of the polymerization process and structure−activity relationships. | Subrata Dolui Devendra Kumar Sanjib Banerjee Bruno Ameduri | 2021 | Accounts of Materials Research2021，2，4： | 0 |
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