Now showing items 96-115 of 192

    • The effect of calcium oxide addition on the removal of metal impurities from metallurgical-grade silicon by acid leaching 

      He, Falin; Zheng, Songsheng; Chen, Chao; 郑淞生; 陈朝 (Springer Boston, 2012 Octob)
      The removal of metal impurities from metallurgical grade silicon (MG-Si) by acid leaching has been investigated with the addition of CaO. Prior to adding CaO, Fe is the main impurity in the MG-Si sample, and the 2nd-phase ...
    • The effect of crystal orientation on the behavior of a polycrystalline tungsten surface under focused Ga+ ion bombardment 

      Ran, Guang; Wu, Shenghua; Liu, Xiang; Wu, Jihong; Li, Ning; Zu, Xiaotao; Wang, Lumin; 冉广; 李宁 (NUCL INSTRUM METH B, 2012-10-15)
      The effect of crystal orientation on the behavior of a tungsten surface under a 30 keV focused Ga+ ion beam with different bombardment angles has been investigated by in situ scanning electron microscopy and electron ...
    • The effect of high/low permittivity in bilayer HfO2/BN resistance random access memory 

      Huang, Jen-Wei; Zhang, Rui; Chang, Ting-Ch; Tsai, Tsung-Ming; Chang, Kuan-Chang; Lou, J.C.; Young, Tai-Fa; Chen, Jung-Hui; Chen, Hsin-Lu; Pan, Yin-Chih; Huang, Xuan; Zhang, Fengyan; Syu, Yong-En; Sze, Simon M.; 张风燕; 黄轩 (American Institute of Physics, 2013-05-20)
      This letter investigated the electrical characteristics of resistance random access memory (RRAM) with HfO2/BN bilayer structures. By adopting the high/low permittivity structure, we obtained the excellent device characteristics ...
    • The effect of surface roughness on self-assembly tungsten nanoneedles induced by focused Ga+ ion beam bombardment 

      Ran, Guang; 冉广; Liu, Xiang; Wu, Jihong; Zu, Xiaotao; Wang, Lumin (ELSEVIER SCIENCE BV, 2012-05-15)
      The effect of surface roughness on the morphological evolution of polycrystalline tungsten during bombardment by focused ion beam has been investigated. The nanoneedles were self-assembled on the mechanically polished ...
    • The structural changes of the bagasse hemicelluloses during the cooking process involving active oxygen and solid alkali 

      Shi, Jian-Bin; Yang, Qiu-Lin; Lin, Lu; Zhuang, Jun-Ping; Pang, Chun-Sheng; Xie, Tu-Jun; Liu, Ying; 林鹿 (Elsevier Ltd, 2012 Octob)
      This work describes the structural changes of bagasse hemicelluloses during the cooking process involving active oxygen (O2 and H 2O2) and solid alkali (MgO). The hemicelluloses obtained from the bagasse raw material, pulp, ...
    • The structural features of hemicelluloses dissolved out at different cooking stages of active oxygen cooking process 

      Shi, Jianbin; Yang, Qiulin; Lin, Lu; 林鹿 (ELSEVIER SCI LTD, 2014-04-15)
      This work described the morphologic changes of corn stalk and the structural characterization of its hemicelluloses dissolved in yellow liquor at different cooking stages. The results showed that active oxygen cooking ...
    • Toward high capacity and stable manganese-spinel electrode materials: A case study of Ti-substituted system 

      Wang, Sihui; Yang, Jiong; Wu, Xiaobiao; Li, Yixiao; Gong, Zhengliang; Wen, Wen; Lin, Min; Yang, Jihui; Yang, Yong; 龚正良; 林敏; 杨勇 (ELSEVIER SCIENCE BV, 2014-01-01)
      LiMn2-xTixO4 (x = 0, 0.5, 1) cathode materials have been synthesized by a conventional solid state method. The capacity of the as-prepared LiMn2O4, LiMn1.5Ti0.5O4 and LiMnTiO4 are 252, 198 and 157 mAh g(-1), respectively, ...
    • UASB生物制氢反应系统生物强化作用研究 

      龙敏南; 史继祥; 徐惠娟; 邬小兵; 胡忠; 徐方成 (2008-09-15)
      采用上流式厌氧污泥床(UASB)反应器,以糖蜜废水为底物,利用厌氧活性污泥发酵产氢.向反应器中投加高产氢微生物产酸克雷伯氏菌HP1,探讨了生物强化作用对反应器产氢能力的影响.研究表明:在污泥接种量为30.0 gVSS/L、启动负荷为6.0 kgCOD/(m3.d)、水力停留时间(HRT)为9 h、投菌量为3%的条件下对生物制氢系统进行强化,可使反应系统产氢能力提高25%,并形成丁酸型发酵产氢,液相末端发酵产物中丁酸和乙酸的含量占挥发酸总 ...
    • Will carbon motivated border tax adjustments function as a threat? 

      Li, Aijun; 李爱军; Zhang, Aizhen; 张爱珍 (ELSEVIER SCI LTD, 2012-08)
      Due to large incremental carbon emissions, China might become an important target country of CBTA (carbon motivated border tax adjustments). To levy CBTA could reduce China's emissions. Meanwhile, China's emissions reduction ...
    • Zeolite-promoted transformation of glucose into 5-hydroxymethylfurfural in ionic liquid 

      Hu, Lei; Wu, Zhen; Xu, Jiaxing; Sun, Yong; Lin, Lu; Liu, Shijie; 孙勇; 林鹿 (ELSEVIER SCIENCE SA, 2014-05-15)
      A variety of zeolite catalysts were investigated for the conversion of glucose into 5-hydroxymethylfurfural (HMF) in ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl), and the results revealed that Hp-zeolite ...
    • Zr-0.8Sn-1Nb-0.3Fe合金Kr~+离子辐照后的耐腐蚀性能研究 

      杨忠波; 程竹青; 邱军; 吴宗佩; 张海; 冉广 (2017-10-15)
      采用高压釜腐蚀实验研究了2种不同制备工艺下的Zr-0.8Sn-1Nb-0.3Fe合金(1#,2#)经360℃、5~25; dpa的Kr~+辐照后、在400℃/10.3 MPa过热蒸汽中的耐腐蚀性能,用透射电子显微镜(TEM)、扫描电镜(SEM)、; X射线衍射仪(XRD)分析合金腐蚀后氧化膜显微组织结构。结果表明,100; d腐蚀后,合金的腐蚀增重随着辐照剂量的增加而增加,由于1#合金中的第二相比2#合金更为细小、弥散,相同辐照剂量下, ...
    • β-葡萄糖苷酶的异源表达及与纤维素酶协同酶解竹纤维 

      成奕瑾; 张婷; 黎海龙; 龙传南; 刘健; 龙敏南 (2013-12-15)
      在毕赤酵母gS115中表达东方肉座菌Eu7-22的β-葡萄糖苷酶基因(bgl),获得基因工程菌株bP17。优化bP17収酵产酶条件后,重组β-葡萄糖苷酶活力达121 Iu/Ml。酶学性质研究表明,该酶最适反应温度为70℃,在60℃以下有较好的热稳定性;最适催化PH为5.0,在PH 3.0~8.0之间有较好的稳定性。将异源表达的β-葡萄糖苷酶添加到东方肉座菌的纤维素酶液中协同降解经过预处理的竹纤维,当纤维素酶添加量为fPA 20 ...
    • 一种新型的太阳能驱动ORC-HP热电联产耦合系统 

      吴国策; 朱兴仪; 赵英汝 (2017)
      提出了一种新型太阳能平板集热器、有机朗肯循环和热泵循环联合的热电联产系统(SORC-HP),系统分别采用有机工质R245fa和制冷剂R22作为朗肯循环和热泵循环的工作介质。通过流程模拟软件gPROMS对整个联合系统进行模拟仿真,以系统的净功率输出、发电效率和热电联产(CHP)效率为性能指标,分析了6个关键参数对联合系统性能的影响。结果显示:存在最优的导热油流率和制冷剂冷凝温度使系统的CHP效率取得极值。将此系统与传统的太阳能有机朗肯循环 ...
    • 不同材料对行波堆有效增殖因数的影响因素分析 

      沈道祥; 张尧立; 郭奇勋; 梁墩煌; 黄锦锋 (2015-9-28)
      行波堆是一种趋近理想状态的先进核能系统,其焚烧策略可将铀资源利用率提高数十倍,废物量减至几十分之一.本文以蒙特卡罗程序为工具,设计了一个圆柱形行波堆堆芯物理模型,研究不同冷却剂、反射层厚度和燃料下行波堆几十年内的有效增殖因数(kEff)的变化情况.结果表明,当其他材料相同时,改变点火区的易裂变核素浓度对稳态时行波堆增殖和裂变的239Pu几乎没有影响,因此在平衡时kEff值保持稳定;增加反射层厚度、使用金属燃料和氦气冷却时反应堆的中子经济 ...
    • 不平衡负载下三相UPS逆变器的研究 

      叶彬城; 孟超; 魏闻 (2016-04-15)
      三相电压的对称输出是衡量交流电源性能的一个重要指标。提出了一种新型的三相UPS逆变器系统,利用Δ/Z0型变压器为三相不平衡负载造成的零序电流分量提供通路,再通过设计正、负序双PI控制器抑制不平衡负载中负序电压分量。从而解决零序电压和负序电压造成的三相电压不平衡问题,使该三相UPS逆变电源系统可带三相不平衡负载。试制一台60k VA的三相UPS样机,并给出实验结果。
    • 东方肉座菌EU7-22木聚糖酶和木糖苷酶基因克隆及生物信息学研究 

      龙传南; 蒋凤姣; 邬小兵; 刘健; 龙敏南 (2013-03-15)
      东方肉座菌Eu7-22具有高产半纤维素酶的能力。根据已报道的同属里氏木霉及绿色木霉木聚糖酶,木糖苷酶相关基因序列,设计PCr引物扩增出东方肉座菌内切木聚糖酶(XynⅠ,XynⅡ)及β-木糖苷酶(β-bXl)基因。序列经nCbIblAST分析:东方肉座菌XynⅠ基因与里氏木霉Xyn1基因(X69573.1)的同源性最高达到91%;XynⅡ基因与绿色木霉Xyn2基因(Ef079061)同源性最高达到93%;β-bXl基因与里氏木霉β-bXl ...
    • 东方肉座菌GH10家族木聚糖酶基因的克隆及异源表达 

      吴金连; 薛勇; 黎海龙; 刘健; 甘礼惠; 龙敏南 (2015-10-18)
      木聚糖酶是降解半纤维素最主要的酶,对于开发可再生生物能源具有重要的应用价值。分别以东方肉座菌(HyPOCrEA OrIEnTAlIS)Eu7-22的基因组dnA和C dnA为模板,利用染色体步移和PCr技术首次克隆获得该菌gH10家族木聚糖酶Ⅲ的基因(XynⅢ),并对其进行生物信息学分析。结果表明:该基因全长1283 bP(gXynⅢ),含有3个内含子;CdS序列为1044 bP(CXynⅢ),编码347个氨基酸,n端含有一个16 ...
    • 两步腐蚀法制备多晶硅绒面 

      张妹玉; 陈朝 (2011)
      采用两步化学腐蚀法在多晶硅材料的表面制备了绒面结构,其中两步腐蚀法包括酸-碱两步腐蚀法和酸-酸两步腐蚀法。通过表面形貌SEM和反射谱的测试,详细地研究了不同腐蚀条件和腐蚀溶液制备绒面的形貌和光学特征。实验发现,当腐蚀速率较快时,多晶硅的绒面形貌会出现大量的晶界和针孔效应,并分析了其形成原因。同时,采用酸-碱两步腐蚀法的效果优于酸-酸两步腐蚀法的效果。最后,用PECVd在绒面上沉积SInX减反射膜,使表面的反射率在600~800nM范围内 ...
    • 两相流冲蚀不锈钢材料的实验研究 

      姚军; 曹培根; 周芳; 赵彦琳; 李宁 (2015-9-28)
      应用两相流对不锈钢材料(304,316)进行冲蚀研究,观察其对材料的磨损腐蚀过程,并对不同条件下材料质量损失和表面形貌进行分析.发现在高速单相流冲蚀下不锈钢材料损伤微弱;但加入微量石英砂后两相流冲蚀对不锈钢材料表面破环迅速,质量明显减少;通过金相显微镜观察发现材料表面有明显的马蹄坑,冲蚀时间越长,表面形貌破坏越严重.
    • 两级下吸式生物质气化炉气化性能的研究 

      臧云浩; 刘运权; 王夺 (2014-6-20)
      在自行设计的两级下吸式生物质气化炉中,研究了空气当量比(Er)对气体组成、气体热值、气化效率以及焦油含量的影响。试验结果表明,该新型两级气化炉能够产生焦油含量较低的燃气;在空气预热的条件下,焦油含量更低,可达238 Mg/M3。该新型两级气化炉的最佳Er为0.33~0.35,当Er=0.34时,气化气低位热值(lHV)最高为4 409 kJ/M3,气化效率为63.7%,焦油含量低于300 Mg/M3。