共查询到20条相似文献,搜索用时 78 毫秒
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选择4种阿昔洛韦片作为研究对象,利用氧弹量热计测定燃烧热,4种阿昔洛韦片燃烧热大小顺序为:厂家2阿昔洛韦片>厂家1阿昔洛韦片>厂家4阿昔洛韦片>厂家3阿昔洛韦片。4种阿昔洛韦片测试样燃烧热在7 511~104 013.77 J/g之间,CV%<4%,从热重分析结果、阿昔洛韦片燃烧性方面分析,4种阿昔洛韦片燃烧稳定性排序为:厂家3阿昔洛韦片>厂家2阿昔洛韦片>厂家1阿昔洛韦片>厂家4阿昔洛韦片。不同厂家4种阿昔洛韦片分为两大类。熵聚类分析应用于抗病毒药物的分类学研究,这项研究为大规模开发阿昔洛韦片药品资源以及分类研究提供有力地科学依据。热重分析阿昔洛韦片的燃烧稳定性,建立4种阿昔洛韦片的多指标综合评价体系,为阿昔洛韦片燃烧稳定性研究提供有力地科学依据。 相似文献
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选择山黄皮、山奈、十三香三种调味品作为研究对象,测定其燃烧热、燃烧稳定性,脂肪、钙、灰分、粗纤维含量(n=3,CV%<3%)。结果表明,三种调味品燃烧热顺序为山黄皮>山奈>十三香;燃烧稳定性顺序为山黄皮>山奈>十三香;脂肪含量(%)大小顺序为十三香>山奈>山黄皮;钙含量(%)大小顺序为山奈>十三香>山黄皮;灰分含量大小顺序为山奈>山黄皮>十三香;粗纤维含量大小顺序为十三香>山黄皮>山奈;燃烧热、燃烧性(调味品的燃烧稳定性)、脂肪含量、钙、灰分、粗纤维含量多指标的熵值法顺序为山奈>十三香>山黄皮。本研究建立了三种调味品的多指标分析及评价体系,为大规模开发调味品资源以及调味品分类研究提供依据。 相似文献
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A combustion model of a solid propellant containing liquid oxidizer capsules was developed. The model is based on the combustion cycle of a unit cell, an oxidizer droplet surrounded by the adjusting amount of binder. Three combustion stages are considered: (1) binder decomposition parallel to oxidizer heating up to boiling temperature, (2) simultaneous binder and oxidizer gasification, and (3) gasification of the remaining condensed phase species. Simple global kinetics are assumed for the gas phase reactions and binder decomposition abiding Arrhenius law, and boiling process for the oxidizer abiding Clausius‐Clapeyron curves. The obtained results show similar trends as do other relevant models and experimental results, especially for the effect of droplet size and propellant composition on the burn rate. The predicted effect of initial temperature on the burn rate is less significant than for common solid propellants. The results indicate that for small droplets the oxidizer will heat up to boiling temperature even before it is revealed on the burning surface, due to heat conduction through the surrounding binder. 相似文献
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Stephen D. Dunmead † Zuhair A. Munir J. Birch Holt 《Journal of the American Ceramic Society》1992,75(1):175-179
An analysis of the use of temperature profiles in the determination of the kinetic parameters of self-sustaining combustion synthesis is provided. Two mathematical approaches are discussed. In the first approach, the analysis focuses on the initial portion of the temperature profile and thus emphasizes the kinetics of the initial stages ( η ≲ 1.0) of this process. The second approach emphasizes both the initial and final stages of the process ( η ∼ 1.0). With the simultaneous measurements of the velocity of the combustion wave, temperature profile analysis provides values for the effective thermal diffusivity of the reactants. 相似文献
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结合三维地震数据及井上的裂缝资料建立了莲花山-张家坪须二段气藏的三维裂缝密度模型、裂缝空间网络模型及裂缝系统的孔、渗属性模型。研究表明:莲花山-张家坪须二段气藏有效砂岩厚度均值为24m,在LH101、LH000-4、zhangjia1等储层较厚处,有效砂岩厚度超过30m,在sanhenan1、LH000-1井等区域,有效砂岩厚度不足10m。莲花山-张家坪须二段气藏基质孔隙度均值为5.12%,在LH101、LH000-4井区,孔隙度超过6.0%,其它区域,孔隙度在5%以下。 相似文献
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为充分利用果壳生物质废弃物,采用热重分析对油茶壳、核桃壳、澳洲坚果壳进行了燃烧实验研究,考察了不同升温速率下3种果壳生物质的燃烧特性及动力学参数。结果表明:3种果壳生物质燃烧特性不同,但燃烧特性参数均随升温速率升高而增大;随着升温速率的增加,着火点、燃尽温度、最大燃烧速率、平均燃烧速率及综合燃烧特性指数提高;10℃/min时,油茶壳、核桃壳、澳洲坚果壳综合燃烧特性指数分别为0.56×10-7、1.18×10-7、0.88×10-7;3种果壳生物质的燃烧反应遵循一级反应动力学模型,相关系数(R2)均达0.93以上,低温阶段活化能为30.40~52.41 kJ/mol,高温阶段活化能为18.49~40.62 kJ/mol,低温阶段活化能均大于高温阶段。 相似文献
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Stephen D. Dunmead Zuhair A. Munir J. Birch Holt 《Journal of the American Ceramic Society》1992,75(1):180-188
The temperature profiles associated with the passing of a self-propagating wave in the combustion synthesis of zirconium boride were investigated. The use of these profiles in the determination of the kinetics of the associated synthesis reaction was investigated. From profile analysis an activation energy of 144.5 ± 15 kJ · mol−1 was calculated and was found to agree very well with the corresponding value obtained from wave velocity measurements, 148.6 ± 12 kJ · mol−1 . From these analyses, the thermal diffusivity of the reactants was also calculated. The thermal diffusivity decreased slightly with increasing combustion temperature, with the values ranging from 2.10 × 10−3 to 1.79 × 10−3 over the range of 2609 to 2909 K, respectively. 相似文献
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