二维流化床内水平射流横向脉动特性的研究

利用图像处理技术,得到了二维流化床内水平射流深度的时间序列,基于Ｒ／Ｓ分析方法,研究了流化数、射流速度和静态床层高度对水平射流横向脉动分类维的影响,结果表明,水平射流横向脉动脉随流化数的增加而加剧,随射流速度和静态床层高度的增加而减弱,探讨了水平射流横向脉动的原因,发现气泡与水平射流的合并是水平射流横向脉动的主要原因。     

Mechanistic Study on Ascorbic Acid Oxidation at Activated Glassy Carbon Electrode

实验结果表明,经在碱性溶液中活化的玻碳电极对抗坏血酸的电化学氧化具有较高的电催化活性,能降低其氧化过电位达３７０ｍＶ;测定了抗坏血酸在活化玻碳电极上电化学氧化的极化曲线,其Ｔａｆｅｌ斜率为５０～７８ｍＶ;提出了抗坏血酸在活化玻碳电极上电化学氧化的机理,表观电荷传递系数α为１．３±０．１,确定了反应机理中的决速步骤     

应用电化学法研究固定床中的液—固传质

利用电化学法测定了空管中的液－固传质系数,得出了无因次准数关联式,并验证了其可行性;在此基础上,用电化学法测定了固定床中液－固间的传质系数,并得出了准数产式ｊｄ＝１．１８Ｒｅ＾－０．５０５。     

配合物处理酵母菌的生物学效应

探讨了配合物参入培养基中对酵母的生物学效应。结果发现,随着培养其中配合物浓度增高,酵母菌的菌落数、细胞的直径、细胞内多种内含物的含量都有所降低。     

Correlation between structure and hardness of magnetron sputtering deposited CNx films

Carbon nitride films are deposited on Si (001) substrates by reactive dc magnetron sputtering graphite in a pure N2 discharge. The structure of carbon nitride films has been probed using Fourier transformation infrared, near edge X-ray absorption fine structure (NEXAFS) and high resolution electron microscopy (HREM), and the hardness has been evaluated in nanoin-dentation experiments. FTIR spectra show that N atoms are bound to sp1, sp2, and sp3 hybridized C atoms. C1s NEXAFS spectra show that the intensity of π* resonance is the lowest for the film grown at substrate temperature TS = 350℃, with a turbostratic-like structure and high hardness, while it is the highest for the film grown at TS = 100℃, with an amorphous structure and low hardness. The correlation between the structure and hardness of carbon nitride films has been discussed.     

Stable carbon and oxygen isotopic compositions of carbonates in middle Mesoproterozoic Wumishan Formation and sea-level change

δ13C of dolostones from the Wumishan Formation (1 310-1 207 Ma) in the Ming Tombs area near Beijing ranges from - 1.5 to 1.5‰ (PDB), and generally, the δ18O ranges from - 4 to - 5‰ (PDB). The secular variation of stable carbon isotopic compositions is cyclic. δ13C displays positive shifts from a sequence boundary to 1.5 per mil (PDB), then a negative shifts to - 1.5 per mil (PDB). In some unit, where δ13C values of the rocks are negative, they have relatively high δ18O values close to -4.0‰ (PDB). These characteristics of the carbon and oxygen isotopic compositions may be associated with sea-level changes.     

Effects of low frequency electromagnetic fields on osteoblasts proliferation and cell cycle

After primary mouse osteoblasts and ROS osteo-like cells were exposed to 50 Hz low frequency electromagnetic fields (EMF), the MTT method and flow cytometry have been used to determine cell proliferation, cell cycle and apoptosis. The results show that, compared with the control, the cells after exposure are more abundant, have larger S phase ratios and lower apoptosis ratios. The results indicate that EMF has an important biological effect which influences cell proliferation and cell cycle.     

CH4／CO2体系化学气相淀积金刚石的非平衡定态相图计算

用非平衡热力学耦合模型首次获得了由ＣＨ４／ＣＯ２体系化学气相淀积金刚石的相图。该相图与用经典平衡热力学得 结果不同,相图中出现了１个金刚石的生长区,相图中的金刚石生长区是实现金刚石气相生长的热力学基础,它的存在体现了超平衡氢原子等激活粒子对石墨的激活和对金刚石的稳定作用。     

钢铁中碳硫的高速分析

采用高速自动引燃炉,自动燃样,由单片机,光电池,组合氧流量定位,自动控制滴定、吸收程序,联合测定碳硫,含量直读。单样测定时间仅需数分钟,测定准确度和精密度高,适用于各种钢铁中碳硫的分析。     

温变形对碳钢组织细化的作用

研究了中温预变形对亚、过共析钢组织的影响。结果表明,对于亚共析钢,在中温区变形、保温后可使先共析铁素体和珠光体组织大大细化,显著改善钢中铁素体和珠光体的分布状况;对于（ 过） 共析钢,中温区预变形则可大大缩短钢的球化时间,改善球化效果,细化组织,特别是对消除钢中的网状组织具有明显的效果。