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高职仪器分析仿真实验教学的探讨 总被引:2,自引:1,他引:1
分析了传统仪器分析实验教学中存在的问题,也探讨了仪器分析仿真教学的优势,阐述了从实验室建设、师资建设、实验项目选择等方面开展虚拟仿真实验的实施方法。 相似文献
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分别采用多重参考坐标系(MRF)方法和滑移网格方法,对导流件和叶轮强作用的涡轮流量计内部流场,进行了计算流体力学(CFD)仿真,并计算了仿真仪表系数。结果表明:采用MRF仿真方法时,仿真模型中导流叶片和叶轮叶片的相对位置对仿真结果有较大影响;采用滑移网格方法对涡轮流量传感器内部流场进行仿真更合理,仿真仪表系数和线性度与实验结果相比更准确。 相似文献
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文章阐述了化工原理仿真实验的特点及其开展的必要性,总结了仿真实验和传统实验的优缺点,只有传统实验和仿真实验二者相辅相成,才能更好的锻炼学生的工程实践能力,提高实验教学质量。 相似文献
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物理化学实验在整个大学基础化学实验体系中起着承上启下的作用。将多媒体计算机和网络等现代教育技术应用到物理化学实验中,尤其是虚拟仿真实验室的建立,有利于同时提高学生和教师的综合素质。 相似文献
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The present work is dealing with the attachment of d-glucosaminic acid (D-GA) on glassy carbon electrode by two different methods. Firstly, the electrode was modified by chloromethylphenyl groups by reduction of 4-chloromethylphenyldiazonium cations followed by the nucleophilic substitution of the chlorine by the amine functionality of D-GA and secondly by the direct immobilization of the amine terminated molecule. The generality of the nucleophilic substitution reaction and the direct immobilization of an amine were also demonstrated with reactants bearing an electroactive ferrocene moiety; 4-nitrophenylferrocene (NFc) and 4-ferrocenylaniline (FcA). The surfaces modified with FcA and NFc were investigated by cyclic voltammetry, and the D-GA modified electrodes were characterized by X-ray photoelectron spectroscopy. A preliminary evaluation of the efficiency of these surface modifiers to prevent protein adsorption was realized by scanning electron microscopy. 相似文献
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Carbon nanofibers (CNFs) are grown on metal catalysts and electrochemical treatment is used to remove the metal catalyst residuals from the as-grown CNFs. For comparison, the CNFs are also purified by a chemical method and a thermal method. The oxygen reduction reaction (ORR) properties of CNFs purified by these three methods are examined by cyclic voltammetry. CNFs treated by the electrochemical method have a more positive ORR onset reduction potential and peak potential compared with those treated by chemical and thermal methods, and this is because the microstructures of CNFs are less changed by electrochemical method. However, they have a lower electrochemical capacity and ORR peak current than those treated by the chemical method. Cyclic voltammetric measurements at different scan rates confirm that the oxygen reductions on CNFs treated by electrochemical and chemical methods are controlled by diffusion, while on CNFs treated by thermal method is partially influenced by diffusion. 相似文献
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以季铵盐型改性淀粉为介孔模板,采用蒸汽相法成功合成多级孔EU-1沸石。通过XRD,FT-IR,SEM,N_2吸附-脱附和NH_3-TPD等手段对合成样品的物化性质进行表征。研究表明:通过调节季铵盐型改性淀粉的量,样品的介孔孔容增加了0.081 cm~3/g,外表面积增加了23.35 cm~2/g。通过二甲苯异构化测试来考察样品的催化性能,发现:对二甲苯(PX)平衡浓度提高了0.88个百分点,乙苯的转化率提高了8.47个百分点,C_8烃收率提高了1.66个百分点。 相似文献
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Y. F. Nicolau 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1983,33(7):350-360
Two methods of obtaining high purity HgI2 by wet-synthesis are described: one by direct synthesis from the elements and the other by a double exchange reaction. Further purification of the synthesised HgI2 by recrystallisation, electrolysis and sublimation is described. The efficiency of the purification methods is tested by emission spectroscopy and by mass spectrometry analyses. 相似文献
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2-氯吡啶的合成研究 总被引:2,自引:0,他引:2
以吡啶为原料,用两步法(先用过氧化氢将吡啶氧化成氧化吡啶,再与三氯氧磷反应)、光氯化法(在紫外光的照射下,吡啶与氯气反应)和高温氯化法(在290℃的高温下,吡啶与氯气反应)三种方法合成2-氯吡啶,研究了溶剂与吡啶的摩尔比、反应时间等对产率的影响。结果表明:两步合成法总产率不高,约20%~25%;直接光氯化法和高温氯化法产率较高,尤其前者,通过3次反应,产率可达到80%以上。 相似文献
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以三氧化二锑(Sb2O3)、不同质量比的铝酸钠/硅酸钠复合物分别作为聚酯缩聚催化剂制取聚酯切片,利用凝胶渗透色谱(GPC)、色值、差示扫描量热(DSC)及热失重(TG)对聚合产物分别进行分析.结果表明:以铝硅复合催化剂F1[n(铝酸钠)∶m(硅酸纳)=4∶1]催化制取的聚酯相对分子质量及分子质量分布接近以Sb2O3催化制取的聚酯,而且色相指标比用Sb2O3催化制取的聚酯好,其白度L值高,黄度b值低;复合催化剂制取的聚酯的玻璃化转变温度(Tg)低于Sb2O3催化制取的聚酯,但结晶温度高于Sb2O3催化的聚酯,表明聚酯的结晶能力有所提高;复合催化剂催化聚合的聚酯热性能与常规Sb2O3催化的聚酯基本接近. 相似文献