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通过高效液相色谱法对3株酿酒酵母(Saccharomyces cerevisiae)发酵过程中葡萄糖、甘油、乙醇及有机酸含量进行测定分析。结果表明:S.cerevisiae1946发酵体系中甘油和乙醇的含量显著高于S cerevisiae P1和S.cerevisiae 32788发酵体系(P0.05);3株酿酒酵母发酵液中7种有机酸存在明显的差异性和规律性;S.cerevisiae 1946发酵体系中有机酸的含量低于S.cerevisiae P1和S.cerevisiae 32788发酵体系,S cerevisiae的产酸水平与产乙醇能力呈负相关关系。 相似文献
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从郴州冰灾抢险到汶川地震救援,从北京奥运会到上海世博会,移动式发电车都发挥了重要的作用,保证了电力企业对用户的连续稳定供电。截至写作本文时,河南省电力公司共向各地市供电企业集中配发移动式发电车144台,加之各基层单位自行采购或改装的移动式发电车,发电车总功率达38800kW。本文从使用移动式发电车中遇到的两个问题人手,介绍我公司对移动式发电车的维护措施,供同行参考。 相似文献
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设计了一种应用于射频功放的负压低压差线性稳压器。通过设计负压带隙基准源,以及采用预稳压模块,有效地降低了电源电压对负压LDO输出电压的影响;通过优化控制环路中的功率管尺寸、误差放大器以及电阻反馈网络等措施,在保证大电流输出的前提下,有效地降低了负压LDO的压差,提高了稳压器的整体性能。采用CSMC 0.5μm CMOS工艺进行设计并实现,测试结果表明,当输出电流为500mA,输出电压为-3V时,压差仅为170mV。 相似文献
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满洲窗作为从北方传入的窗式,在结合了珠江三角洲地区的气候、地理、文化、艺术、技术、经济等诸多因素,同时吸收了西洋窗式的元素后,变革出强烈的地域特征,体现了珠三角文化勇于变革、兼容并蓄的精神.通过对珠三角满洲窗的构造、材料、文化内涵等资料的收集、整理和分析,作为对面临消失危机的传统技艺的记录,也有助于我们以积极主动的态度... 相似文献
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A model of subthreshold characteristics for both undoped and doped double-gate (DG) MOSFETs has been proposed. The models were developed based on solution of 2-D Poisson's equation using variable separation technique. Without any fitting parameters, our proposed models can exactly reflect the degraded subthreshold characteristics due to nanoscale channel length. Also, design parameters such as body thickness, gate oxide thickness and body doping concentrations can be directly reflected from our models. The models have been verified by comparing with device simulations' results and found very good agreement. 相似文献
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关于短沟道双栅无结型晶体管的仿真研究 总被引:1,自引:1,他引:0
We study the characteristics of short channel double-gate(DG) junctionless(JL) FETs by device simulation. OutputⅠ-Ⅴcharacteristic degradations such as an extremely reduced channel length induced subthreshold slope increase and the threshold voltage shift due to variations of body doping and channel length have been systematically analyzed.Distributions of electron concentration,electric field and potential in the body channel region are also analyzed.Comparisons with conventional inversion-mode(IM) FETs,which can demonstrate the advantages of JL FETs,have also been performed. 相似文献