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排序方式: 共有58条查询结果,搜索用时 31 毫秒
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S. SrikanthT. Pavani P.N. SarmaS. Venkata Mohan 《International Journal of Hydrogen Energy》2011,36(3):2271-2280
Comprehensive study was performed to understand the synergistic interaction between the biocatalyst and anode in terms of electron discharge (ED) pattern and microbial growth by varying electrode (bio-anode) materials viz., graphite, aluminum, brass, copper, nickel and stainless steel. Experiments were performed in bio-electrochemical cell consisting of three electrodes (bio-anode as working electrode, carbon rod as counter electrode and Ag/AgCl(S) as reference electrode) employing anaerobic mixed culture as anodic biocatalyst. Voltammetric and chronoamperometric analysis were used to enumerate the ED and redox reactions. Presence of higher microbial population and dominance of Gram positive bacteria with higher ED supported graphite function as a good bio-anode material. Nickel and stainless steel showed higher ED after graphite associated with dominance of Gram positive bacterial population. Although higher ED was noticed with brass, metal oxidation and decrement in ED with time doesn’t support its function as bio-anode. In spite of higher ED than nickel and stainless steel, aluminum and copper showed significant metal oxidation leading to change in both physical and electrochemical properties along with dominant growth of Gram negative bacteria. This study gives a comprehensive idea on biocatalyst interaction with anode in extracellular electron transfer which is important in improving the anode performance. Juxtaposing the results, it can be deduced that the outcome of the present study can be extended to all bio-electrochemical systems including microbial fuel cell (MFC). 相似文献
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Mohsen Danaie Christian MauerDavid Mitlin Jacques Huot 《International Journal of Hydrogen Energy》2011,36(4):3022-3036
We have tested the hydrogen storage cycling behavior of bulk centimeter-scale magnesium - titanium and magnesium - stainless steel multilayer composites synthesized by accumulative roll-bonding (ARB). Roll-bonding of either titanium or stainless steel with magnesium allows the reversible hydrogen sorption of the resulting composite at 350 °C. Identically roll-bonded pure magnesium can hardly be absorbed at this temperature. In the composites, the kinetics of the first cycle of absorption (also called “activation”) improves with increased number of fold and roll (FR) operations. With increasing FR operations the distribution of the Ti phase is progressively refined, and the shape of the absorption curve no longer remains sigmoidal. Increasing the loading amount of the second phase also accelerates the kinetics. This holds true up to a threshold limit. Microscopy analysis performed on 1-2 wt.% hydrogen absorbed composites demonstrates that MgH2 formed exclusively on various heterogeneous nucleation sites. During activation, MgH2 nucleation occurred at the Mg-hard phase interfaces. During the subsequent absorption cycles, heterogeneous nucleation primarily occurred in the vicinity of “internal” free surfaces such as cracks. 相似文献
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目的: 评价血管紧张素转换酶抑制剂 (ACEI) 联合血管紧张素II受体拮抗剂 (ARB) 对糖尿病肾病肾功能的临床治疗效应。方法: 检索1990年1 月至2012年3月期间,国内公开发表的有关ACEI 或ARB联合及单独用药对治疗糖尿病肾病的随机对照临床试验研究文献,分析符合纳入标准的文献中有关肾功能疗效指标,并对其药物治疗前后的差值进行Meta 分析。结果: 共12项文献,包括900例糖尿病肾病患者纳入研究。Meta 分析显示,与ACEI 或ARB单独治疗组的肾功能指标相比,联合治疗组患者的 24 h 尿微量白蛋白排泄率、24 h 尿微量白蛋白和24尿蛋白定量的标准化均数合并效应量均有明显的改善 (P<0.05),而单药组和联合用药组之间的血肌酐、尿素氮和电解质则无明显改变。结论: ACEI 联合ARB治疗较单独用药治疗能明显改善糖尿病肾病患者尿蛋白的滤过作用,期待更多高质量的随机双盲对照试验提供高质量的证据。 相似文献
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根据工业纯钛TA1和Q235钢两种材料相变温度接近的特点,提出了利用低压循环相变预复合-累积叠轧焊制备TA1/Q235钢复合板的新方法。研究结果表明:经过热循环后的试样,在变形过程中,C、Ti原子的扩散并不限于沿垂直于界面的方向,而是可以沿任意方向随机进行的,在Q235钢界面附近没有出现柱状晶,界面附近的铁素体晶粒,从界面附近沿心部成梯度分布;采用累积叠轧焊所制备出的TA1/Q235钢复合板的结合强度得到明显改善,在复合温度为850℃、低压循环相变3次所得到的TA1/Q235钢累积叠轧焊复合板结合强度达到257.3MPa。但是,当热循环相变次数过多时,会增加金属间化合物的厚度,对结合强度产生不利影响。 相似文献