66 research outputs found

    The Study of Chlorella vulgaris Harvesting Using Foam Separation

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    考察了泡沫分离法采收小球藻的可行性,研究了不同表面活性剂、表面活性剂用量、藻液PH值、藻液原液体积、分离气速等因素对泡沫分离法采收小球藻的影响.结果表明,在本实验中构建的泡沫分离装置条件下采用泡沫分离法收集小球藻时,以十六烷基三甲基溴化铵为表面活性剂,且在其用量为0.25g/l、藻液PH为11、分离原液体积为200Ml和分离气体流速为70Ml/MIn时,富集比和分离率相对较高,富集比和分离率分别为8.39和99%,小球藻的泡沫分离收集效果最好.The Chlorella vulgaris harvesting using foam separation was studied in this work.The optimum surfactant and the optimum concentration of surfactants were investigated,as well as the optimum pH,volume of algae culture and the gas velocity.The results showed that the cetyl trimethyl ammonium bromide was the best surfactant in the study and the optimum surfactant concentration was 0.25g/L.Additionally,the optimum volume of algae culture was 200 mL,the optimum pH was 11 and the gas velocity was70mL/min,under which the higher enrichment ratio and the isolation rate were up to 8.39 and 99%,respectively.国家自然科学基金(21406185); 福建省科技计划重点项目(2013H0043

    Beam Transformation Technology of Pixellated Dammann Grating in Laser Processing

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    针对大功率激光加工对光束空间强度分布的实际要求,提出了一种用二元光学元件对光束进行变换的方法,即利用均匀采样的矩形孔径Dammann光栅对激光高斯光束进行光束变换,可满足任意点阵分布的输出要求。以线状、均匀、环状和非均匀分布的光强输出为例,介绍了矩形孔径Dammann光栅光束变换技术的设计原理及实现方法,结果表明输出光强分布具有较高的衍射效率和均匀性。将均匀和非均匀分布的输出光束应用在激光加工技术的表面强化上,结果表明试样表面的硬度和耐磨性等力学性能均有提高并且强化层具有较好的均匀性

    Make microspheres through emulsion-solvent evaporation method

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    采用O/W型乳化-溶剂挥发法来制备载药微球,以二氯甲烷为溶剂相,以聚乳酸为载体材料,以维A酸为包埋药物,以吐温-80和明胶为乳化剂。探索载药微球制备过程中的变量(高剪切转速、高剪切时间、内外相体积比、壁材用量等)对载药微球粒径大小、包封率以及稳定性等的影响。得出最优载药微球制备方案:明胶浓度7.5Mg/Ml,吐温浓度6Mg/Ml,聚乳酸浓度10 Mg/Ml,内外相体积比1∶10,剪切时间30MIn,搅拌速度300r/MIn,挥发时间3H。所制得的聚乳酸载药微球形态光滑且分散性较好,包封率为52.42%。In this study,o/w emulsion-solvent evaporation method was used to make microspheres,using dichloromethane as the solvent phase,polylactic acid as the carrier material and vitamin A acid as the entrapped object,tween 80 and gelatine as emulsifier.The technical conditions such as shear speed,shear time,internal,external phase volume ratio and the amount of wall material were determined.The experiments demonstrated that the optimal conditions were:gelatin concentration of 7.5mg/mL,tween concentration of 6mg/mL,polylactic acid concentration of 10mg/mL,inside and outside the phase volume ratio of 1∶10,shearing time of 30 min,stirring speed of 300r/min,volatile time of 3h.The final product was smooth and well dispersed,and the encapsulation efficiency was 52.42%.国家自然科学基金资助项目(21406185); 福建省科技计划重点资助项目(2013H0043

    Preparation and Application Prospect of LED Light-emitting Materials

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    发光二极管(lIgHT EMITTIng dIOdES lEd)在日常生活生产中得到了广泛的应用。本文对发光材料进行了分类,详细介绍了发光材料研究进展及具体制备方法,并对lEd的研究进展、应用情况以及目前存在的一些问题进行阐述。Light emitting diodes was more and more widely used in daily life.In this article, the classification of luminescent material, the research progress and preparation method was introduced in detail.Application situation and some problems in the development of LED were discussed

    一种激光整形方法及整形后激光硬化处理设备及方法

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    本发明的激光整形方法及整形后激光硬化处理设备及方法,通过设置特殊形式的光栅对激光进行整形进而通过整形后的激光,对待处理材料进行硬化处理。经光栅整形后的激光各衍射级之间的强度不同,用此种光斑进行激光表面硬化,这种激光表面硬化的优点是提高材料的硬度的同时,大大改善了材料的硬化层均匀度

    一种激光精微打孔工艺参数优化方法

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    一种激光精微打孔工艺参数优化方法,所述方法主要包括以下步骤:1)、确定目标孔型;2)、根据目标孔型,进行工艺参数预测,并进行数值仿真;3)、然后根据数值仿真中的工艺参数进行实际打孔实验;4)、对工艺参数进行优化,最终得到目标工艺参数。本发明提供的激光精微打孔工艺参数优化方法可节省激光打孔试验前期大量的探索性试验,极大的减小了工作量,最大程度降低了试验成本,提高了加工效率

    平衡支架与配重铅块的激光焊接方法

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    本发明公开了一种平衡支架与配重铅块的激光焊接方法,具体为:采用激光作为焊接能量,将配重铅块焊接到平衡支架的设定位置上。本发明平衡支架与配重铅块的激光焊接方法,利用激光能量密度高,热影响区小,可控性好,焊接过程中构件热变形小的特点,实现平衡支架和配重铅块的焊接,提高平衡支架与其配重铅块的连接可靠性

    用欧拉法对薄壁件激光直接成形建模

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    采用欧拉方法建立了激光直接成形薄壁件的二维传热模型。分离模型中的参数和变量并对模型进行了无量纲化,对最终无量纲化模型中的6个无量纲参数进行了分析讨论。研究表明:针对此二维传热模型的无量纲化减少了参数,简化分析过程;在激光直接成形过程中,实际层高和光束移动速度的乘积共同对温度场起作用,而非单独影响温度场

    Mathematical modeling of laser direct metal forming of thin wall by Eulerian method

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    采用欧拉方法建立了激光直接成形薄壁件的二维传热模型。分离模型中的参数和变量并对模型进行了无量纲化,对最终无量纲化模型中的6个无量纲参数进行了分析讨论。研究表明:针对此二维传热模型的无量纲化减少了参数,简化分析过程;在激光直接成形过程中,实际层高和光束移动速度的乘积共同对温度场起作用,而非单独影响温度场
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