283 research outputs found

    Research progress in cigarette combustion model

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    综述国内外有关卷烟燃烧模型的研究进展。认为应在深入研究卷烟燃烧过程和机理的基础上,建立全面系统准确的卷烟燃烧数学模型,以便为工艺改进提供科学依据。Research progress in cigarette combustion model was reviewed.Suggestions were proposed that comprehensive,systematic and accurate mathematical model of cigarette combustion need to be established based on further research in combustion mechanism to improve blending technique

    第十八届美国理论与应用力学大会总结

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    1会议概况2018年6月5—9日,第18届美国理论与应用力学大会(18th U.S. National Congress of Theoretical and Applied Mechanics, USNCTAM2018)在美国芝加哥召开.本次大会由美国力学国家委员会和中国力学学会联合主办,旨在探讨和交流近四年世界范围内在理论和应用力学领域的基础研究、创新技术的最新进展,吸引了来自世界各地的近千名专家学

    Three-dimensional structure of a low salinity tongue in the southern Taiwan Strait observed in the summer of 2005

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    Cruise observations with CTD (conductivity-temperature-depth) profiler were carried out in the southern Taiwan Strait in the summer of 2005. Using the cruise data, two-dimensional maps of salinity and temperature distributions at depths of 5, 10, 15, 20, and 30 m were generated. The maps show a low salinity tongue sandwiched by low temperature and high salinity waters on the shallow water side and high temperature and high salinity waters on the deep water side. The further analysis indicates that the low salinity water has a nature of river-diluted water. A possible source of the diluted water is the Zhujiang (Pearl) Estuary. Meanwhile, the summer monsoon is judged as a possible driving force for this northeastward jet-like Current. The coastal upwelling and the South China Sea Warm Current confine the low salinity water to flow along the central line of the strait. Previous investigations and a numerical model are used to verify that the upstream of the low salinity current is the Zhujiang Estuary. Thus, the low salinity tongue is produced by four major elements: Zhujinag Estuary diluted water, monsoon wind driving, coastal upwelling and South China Sea Warm Current modifications.National Natural Science Foundation of China [40331004, 40576015, 40810069004, 40821063]; MEL Open Project [MEL0506]; ONR [N00014-05-1-0328, N00014-05-1-0606]; NSF [071003-9222

    枯草杆菌溶栓酶恒溶氧发酵动力学参数估计

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    用10L自控搅拌式反应器对枯草杆菌(Bacillus subtllis HL-986)发酵生产溶栓酶的动力学进行了研究,建立了恒溶氧分批培养条件下细胞生长、还原糖消耗及溶栓酶积累的动力学模型

    秸秆汽爆炼制木质素制备酚醛泡沫材料

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    以木质纤维素为原料的生物炼制不仅需要考虑到纤维素和半纤维素,同时也需要考虑到木质素的利用,以提高木质纤维素炼制的整体经济效益。利用汽爆处理的玉米秸秆为原料,通过优化碱提取的温度以及碱浓度,获得木质素得率较高,糖含量较少的提取液,同时该提取液经过浓缩后直接部分替代苯酚与甲醛反应制备酚醛泡沫。结果表明:当提取温度120℃,碱浓度1%,固液比1∶10,提取时间2 h,木质素的提取率达到79.67%。由该提取液替代苯酚制备的酚醛泡沫随着替代率的增加,其泡沫的密度逐渐增加,其压缩强度相对于纯酚醛泡沫也得到了提高。而木质素的加入并没有显著影响其热导率以及阻燃性能,同时由于其利用较为低廉的可再生资源木质素替代不可再生的苯酚原料,成本低,环保性好,具有更好的市场应用前景。采用木质素提液直接制备酚醛泡沫材料,工艺流程简单;增加了副产物木质素的经济价值,提高了整个木质纤维素炼制的经济性

    木质纤维素原料中漆酶天然介体的研究进展

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    漆酶作为一种多功能金属氧化酶,被认为是未来工业生物催化中"可持续环境友好过程生物技术的工具"。但是由于典型漆酶催化体系中合成介体存在价格昂贵且有毒等问题而一直未能实现工业化。从木质素小分子前体物质或者中间体及降解产物中寻找稳定、高效、低毒和价廉的天然介体成为当前的研究热点和重点。本文从漆酶介体的类型与催化机理、木质纤维素原料炼制中间产物(如汽爆秸秆水洗液、造纸黑液、木质纤维素生物降解产物等)中天然介体的种类与分离等方面,论述从木质纤维素原料降解产物中分离漆酶天然介体并进行应用的可行性,为挖掘高反应活性的漆酶天然催化介体,构建漆酶多介体连续催化体系,实现木质纤维素原料降解产物的定向高值利用奠定基础

    影响纤维素酶解的因素和纤维素酶被吸附性能的研究

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    本文以预处理的木质纤维素的结晶纤维素为材料,研究纤维素的吸附过程及影响酶 主要是而探讨纤维素酶解机制

    无污染秸秆汽爆新技术及其应用

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    基于秸秆与木材在化学组成和结构上的差异,提出对秸秆不加任何化学药品的低压爆破技术。在研究秸秆无污染汽爆作用机制的基础上,开发出了无污染汽爆技术清洁制浆、大麻清洁脱胶、秸秆制备腐植酸和活性低聚木糖等一系列创新方法。该技术不仅在秸秆综合利用上得到应用,而且还可应用于烟草加工、造纸工业、中草药提取和麻纤维清洁脱胶等行业
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