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Behavior of HVOF WC-10Co4Cr Coatings with Different Carbide Size in Fine and Coarse Particle Abrasion

JOURNAL OF THERMAL SPRAY TECHNOLOGY 2010年第1-2期19卷 368-377页

作者： Ghabchi, Arash Varis, Tommi Turunen, Erja Suhonen, Tomi liu, xuwen Hannula, S. -P. Tech Res Ctr Finland VTT Espoo Finland Aalto Univ Dept Mat Sci & Engn FIN-02150 Espoo Finland SUNY Stony Brook Dept Mat Sci & Engn Ctr Thermal Spray Res Stony Brook NY USA

A modified ASTM G 65 rubber wheel test was employed in wet and dry conditions using 220 nm titania particles and 368 mu m sand particles, respectively. Both tests were conducted on WC-CoCr coatings produced with two powders with different carbide grain sizes (conventional and sub-micron) to address the effect of carbide size and abrasive medium characteristics on the wear performance. The same spot before and after the wet abrasion wear testing was analyzed in detail using SEM to visualize wear mechanisms. It was shown that the wear mechanism depends on the relative size of the carbide and abrasive particles. Wear mechanisms in dry sand abrasion were studied by analyzing the single scratches formed by individual abrasive particles. Interaction of surface open porosity with moving abrasive particles causes formation of single scratches. By tailoring the carbide size, the wear performance can be improved.

关键词： HVOF rubber wheel abrasion test WC-CoCr wear mechanism

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Behavior of HVOF WC-10Co4Cr Coatings with Different Carbide Size in Fine and Coarse Particle Abrasion

Behavior of HVOF WC-10Co4Cr Coatings with Different Carbide ...

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International Thermal Spray Conference (ITSC 2009)

关键词： HVOF rubber wheel abrasion test WC-CoCr wear mechanism

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水力负荷对潜流湿地去除污水处理厂二级出水中氮磷的影响

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水处理技术 2012年第8期38卷 118-121页

作者：王昊曹国凭何绪文杨永刘晓河北联合大学建筑工程学院河北唐山063009 中国矿业大学(北京)化学与环境工程学院北京100083

采用水平-石灰石、水平-沸石、垂直-沸石、垂直-改性沸石等4种潜流湿地对污水处理厂二级出水进行深度处理研究,探讨各系统稳定运行条件下,不同水力负荷对4种潜流湿地脱氮除磷效果的影响,以及4种湿地的去除污染物效果的差异性。结果表明... 详细信息

采用水平-石灰石、水平-沸石、垂直-沸石、垂直-改性沸石等4种潜流湿地对污水处理厂二级出水进行深度处理研究,探讨各系统稳定运行条件下,不同水力负荷对4种潜流湿地脱氮除磷效果的影响,以及4种湿地的去除污染物效果的差异性。结果表明,当进水水质为污水处理厂二级排放标准时,在一定的运行条件下,与垂直潜流湿地相比,水平潜流湿地对氮素的去除效果受水力负荷影响更大。其中,水平-沸石潜流湿地对NH3-N的去除率最高达到(96.5±2.58)%,而水平-石灰石潜流湿地最低仅为(78.7±3.64)%;水平-沸石潜流湿地对TN的去除率最高达到(94.5±2.58)%,最低仅为(66.1±2.02)%。另外,与水平流湿地相比,垂直流湿地对污水中磷素的去除效果较好,同时,垂直-沸石湿地表现出了对磷素最佳的去除效果,其对PO43--P的去除率最高达到(72.1±2.29)%,而对TP的去除率最高最高达到(73.8±3.25)%。此外,当水力负荷为0.093 m3/(m2.d)时,上述4种湿地对磷素均表现出了最佳的去除效果。

关键词：潜流湿地水力负荷污水处理厂二级出水氮磷

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抗虫棉与早熟陆地棉品种间产量及纤维品质性状的配合力分析

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西北农业学报 2012年第2期21卷 64-67页

作者：王娟刘丽孔宪辉王旭文余渝新疆农垦科学院棉花研究所农业部西北内陆区棉花生物学与遗传育种重点实验室新疆石河子832000

用5个早熟陆地棉品种作母本,3个抗虫棉品种作父本,按照不完全双列杂交设计(NCⅡ设计)组配15个杂交组合。对亲本及杂交组合的产量和纤维品质共11个性状进行配合力分析。结果表明,单株铃数、衣分、纤维长度、比强度、马克隆值和纤维伸长... 详细信息

用5个早熟陆地棉品种作母本,3个抗虫棉品种作父本,按照不完全双列杂交设计(NCⅡ设计)组配15个杂交组合。对亲本及杂交组合的产量和纤维品质共11个性状进行配合力分析。结果表明,单株铃数、衣分、纤维长度、比强度、马克隆值和纤维伸长率主要受基因加性效应控制,籽棉产量和皮棉产量主要受基因非加性效应影响。新陆早45号是突出的高衣分丰产亲本,新陆早48号是结铃性较好的丰产亲本,72-72是优良的抗虫棉亲本,组合新陆早48号×111-43和新陆早42号×N78在综合农艺性状上优势明显,但纤维品质相对而言没有明显改良。

关键词：抗虫棉不完全双列杂交农艺性状配合力

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9个早熟陆地棉新不育系主要性状配合力分析

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西北农业学报 2012年第11期21卷 90-95页

作者：刘丽孔宪辉王旭文王娟相吉山余渝新疆农垦科学院棉花研究所农业部西北内陆区棉花生物学与遗传育种重点实验室国家棉花改良中心新疆生产建设兵团分中心新疆石河子832000 新疆农垦科学院作物研究所谷物品质与遗传改良兵团重点实验室新疆石河子832000

为了进一步利用棉花杂种优势,促进三系杂交棉的选育,以哈克尼西棉、三裂棉(D8)和海岛棉(05-53A)3种胞质雄性不育系为母本,以新疆早熟陆地棉新陆早33号、新陆早36号和系9为回交亲本,连续回交4代,获得9(3×3)个新不育系(A1～A9);用3... 详细信息

为了进一步利用棉花杂种优势,促进三系杂交棉的选育,以哈克尼西棉、三裂棉(D8)和海岛棉(05-53A)3种胞质雄性不育系为母本,以新疆早熟陆地棉新陆早33号、新陆早36号和系9为回交亲本,连续回交4代,获得9(3×3)个新不育系(A1～A9);用3个恢复系(R1～R3)与新不育系进行杂交,获得27(9×3)个杂交组合。通过对8个性状配合力分析可知,A3、A4、A6和A9的籽棉产量,A3和A9的单株铃数,A2、A3和A9的铃质量,以及A4和A7的百粒质量的GCA效应值较高;A3×R1组合单株铃数、铃质量和A2×R1组合籽棉产量的SCA效应值最高;这些性状主要受亲本一般配合力和特殊配合力的共同影响,但一般配合力效应较特殊配合力的略大。对9个新不育系和3个恢复系进行亲本利用价值评价发现,A3、A9和R3有较大的利用价值。

关键词：细胞质雄性不育系配合力回交转育陆地棉

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Recent development of the magnetic shape memory materials research in Finland

Recent development of the magnetic shape memory materials re...

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作者： Söderberg, Outi Aaltio, Ilkka Ge, Yanling Soroka, Alexandr Niemi, Raisa liu, xuwen Hannula, Simo-Pekka Department of Materials Science and Engineering Helsinki University of Technology POB 6200 FI-02015 TKK Espoo Finland AdaptaMat Ltd. Yrityspiha 5 FI-00390 Helsinki Finland

ISBN: (纸本)9781617822018

Ni-Mn-Ga based magnetic shape memory (MSM) materials have been studied since 1998 in Finland at the Helsinki University of Technology (TKK, previously HUT). The large HUT-MSM-project resulted in MSM-alloys with high service temperature, 10 % field-induced-strain, as well as circumstances when and how a Ni-Mn-Ga alloy exhibits this phenomenon. The understanding of the structure and behavior of twin boundaries, and their role, for example, in the vibration damping and long-term actuation has been enhanced in the recent projects. Twin boundaries have been studied by XRD, by high-resolution transmission electron microscopy (HRTEM), and by in-situ straining in TEM, the last one in co-operation with the Institute of Physics in Prague (ASCR-IP), Czech Republic. The results obtained by neutron diffraction in co-operation with Hahn-Meitner-Institut Berlin, Institute for Metal Physics (IMP), Kiev, and Institut Laue-Langevin (ILL), Grenoble, have given new crystallographic information. Damping of Ni-Mn-Ga polymer composites has been proved to be excellent at high stiffness levels with the loss factor δ = 0.6 at E ≈ 1 GPa. This research was carried out in co-operation with the University of California Los Angeles (UCLA), USA. In the long-term actuation, a fatigue life of 2 × 109 has been recorded for a five-layered modulated Ni-Mn-Ga structure in mechanical cycling. The evolution of the MSM parameters during the long-term use is recorded and used as an input data for the models developed in the European MAFESMA co-operation. The search for alloys with wide stable thermal property range showing MSM effect has continued and alloys that are stable down to 4 K have been established. Modeling based on Ginsburg-Landau theory has been applied to evaluate aging and thermal fluctuations in the modulated Ni-Mn-Ga structures. As a commercial target, AdaptaMat Ltd. develops technology to produce Ni-Mn-Ga magnetic shape memory material with improved quality, lower twinning stress, longer fa

关键词： Damping

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GluR1 Phosphorylation and Persistent Expression of Levodopa-induced Motor Response Alterations in the Hemi-Parkinsonian Rat

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NEUROCHEMICAL RESEARCH 2011年第6期36卷 1135-1144页

作者： Ba, Maowen Kong, Min Yu, Guoping Sun, xuwen liu, Zhuli Wang, Xiaotong Qingdao Med Univ Yuhuangding Hosp Dept Neurol Yantai 264000 Shandong Peoples R China Yantaishan Hosp Dept Neurol Yantai 264000 Shandong Peoples R China

The phosphorylation of glutamate receptor 1 (GluR1) has been increasingly implicated in the formation and maintenance of plastic responses. To investigate molecular mechanisms that underlie the persisting alterations in motor response occurring with levodopa treatment of parkinsonian patients, we evaluated the time course of these changes in relation to the phosphorylation of GluR1 in 6-hydroxydopamine (6-OHDA) lesioned animals. Three weeks of twice-daily levodopa administration to rats shortened the duration of the rotational responses and increased the peak turning responses, which lasted at least 7 days after withdrawal of chronic levodopa treatment. The shortened response duration and increased peak turning, resembling human wearing-off fluctuations and dyskinesia, were associated with a marked increase in Ser-845 phosphorylated GluR1 (pGluR1S845) immunoreactivity in lesioned striatum in response to levodopa treatment. The time course of changes in GluR1 phosphorylation correlated with the time course of changes in motor behavior after withdrawal of chronic levodopa therapy. Our immunostaining data showed that these changes were confined to parvalbumin-positive neurons where GluR1 are exclusively expressed. Both the altered motor response and the degree of pGluR1S845 were attenuated by the intrastriatal administration of protein kinase A (PKA) inhibitor Rp-cAMPS or GluR1 antisense oligonucleotides. The results suggest that Ser-845 GluR1 phosphorylation within parvalbumin-positive neurons contributes to the persistence of the motor response alterations produced by chronic intermittent dopaminergic stimulation.

关键词： GluR1 Phosphorylation Protein kinase A Motor response alterations Parkinson's disease

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Matrix solid phase dispersion extraction of ginsenosides in the leaves of Panax ginseng CM Mey

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FOOD CHEMISTRY 2011年第3期129卷 1253-1257页

作者： Shi, Xiaolei Jin, Yongri liu, Jingbo Zhou, Hongyu Wei, Wei Zhang, Hanqi Li, xuwen Jilin Univ Coll Chem Changchun 130012 Peoples R China Jilin Univ Coll Quartermaster Technol Changchun 130012 Peoples R China

The matrix solid phase dispersion (MSPD) was applied to the extraction of eight kinds of ginsenosides from the leaves of Panax ginseng C.M. Mey. The experimental conditions were examined and optimised. The extracts were analysed by high performance liquid chromatography (HPLC). When the diatomaceous earth was used as dispersant and 75% methanol was used as elution solvent, the highest extraction yields of the eight kinds of ginsenosides were obtained. For comparison, the reflux extraction was applied. The extraction yields obtained by the proposed method were comparable with those obtained by the reflux extraction. The proposed method is convenient, time-saving, and organic solvent minimising. (C) 2011 Published by Elsevier Ltd.

关键词： MSPD Extraction Leaves of Panax ginseng SEM

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Structural changes in pyramidal cell dendrites and synapses in the unaffected side of the sensorimotor cortex following transcranial magnetic stimulation and rehabilitation training in a rat model of focal cerebral infarct

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Neural Regeneration Research 2011年第9期6卷 676-680页

作者： Chuanyu liu Surong Zhou xuwen Sun Zhuli liu Hongliang Wu Yuanwu Mei Department of Neurology the Affiliated Yantai Yuhuangding Hospital of Qingdao University Medical College Yantai 264000 Shandong Province China Department of Neurology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022 Hubei Province China

Very little is known about the effects of transcranial magnetic stimulation and rehabilitation training on pyramidal cell dendrites and synapses of the contralateral, unaffected sensorimotor cortex in a rat model of focal cerebral infarct. The present study was designed to explore the mechanisms underlying improved motor function via transcranial magnetic stimulation and rehabilitation training following cerebral infarction. Results showed that rehabilitation training or transcranial magnetic stimulation alone reduced neurological impairment in rats following cerebral infarction, as well as significantly increased synaptic curvatures and post-synaptic density in the non-injured cerebral hemisphere sensorimotor cortex and narrowed the synapse cleft width. In addition, the percentage of perforated synapses increased. The combination of transcranial magnetic stimulation and rehabilitation resulted in significantly increased total dendritic length, dendritic branching points, and dendritic density in layer V pyramidal cells of the non-injured cerebral hemisphere motor cortex. These results demonstrated that transcranial magnetic stimulation and rehabilitation training altered structural parameters of pyramidal cell dendrites and synapses in the non-injured cerebral hemisphere sensorimotor cortex, thereby improving the ability to compensate for neurological functions in rats following cerebral infarction.

关键词： cerebral infarction transcranial magnetic stimulation rehabilitation training sensorimotor cortex pyramidal cell dendrites synapse neural regeneration

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RETRACTED ARTICLE: AAdvanced treatment of coking wastewater in relation to COD using three-dimensional electrodes

RETRACTED ARTICLE: AAdvanced treatment of coking wastewater ...

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作者： He, xuwen Gong, Jingwen liu, Liyuan Wang, Hao Zhang, Gong Qin, Qiang School of Chemical and Environmental Engineering China University of Mining and Technology Beijing 100083 China

ISBN: (纸本)9781424450893

Saturated coke as filler materials, experiment on the advanced treatment of coking wastewater by three-dimensional fixed bed electrode reactor was carried out. It was indicated that coke powder can be used as catalytic electrode, an optimized conditions for electrolysis time 60min, current density 8A, particle size 10-20mesh number, dosing quantity 400ml, plate spacing 1cm,COD removal efficiency was up to 70%. Analyzing the code that was used before and after experiments by SEM, we find that coke was appropriate as filled electrode as its compact structure, high crystallinity and proper porosity. The degradation mechanism of COD in the experiment was also carried out and obeyed the first order dynamics. © 2011 IEEE.

关键词： Wastewater treatment

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