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Fe掺杂及球磨处理对Sm_2Co_(17)合金结构和磁性的影响

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功能材料 2014年第B12期45卷 105-109页

作者：孙乃坤杜胜杰沈阳理工大学理学院沈阳110159

用电弧熔炼法制备Sm2（FexCo1-x）17（z=O，O.3和O.7）母合金锭，均匀化退火后采用球磨方法制备纳米晶合金粉末。研究了Fe掺杂及球磨处理对Sm：（FexCo1-x）17合金结构、居里温度及永磁性能的影响。实验结果表明，随着Fe含量增多，合金... 详细信息

用电弧熔炼法制备Sm2（FexCo1-x）17（z=O，O.3和O.7）母合金锭，均匀化退火后采用球磨方法制备纳米晶合金粉末。研究了Fe掺杂及球磨处理对Sm：（FexCo1-x）17合金结构、居里温度及永磁性能的影响。实验结果表明，随着Fe含量增多，合金中1：5相逐渐减少，当x=0.7时，形成单相2：17型化合物，同时居里温度从938℃（x=0）下降到590℃（x=0.7）。球磨处理过程有利于形成单相2：17纳米合金粉，饱和磁化强度随着球磨时间的增加逐渐增大，同时内禀矫顽力和磁能积与球磨时间的关系呈两头下降的趋势。球磨时间在O．5～1h时，纳米合金粉末的永磁磁性能达到最佳，Sm2Co17的最佳磁性能为4兀Ms=O.65T，1Hc=246．8kA／m，（BH）max=25．5kJ／m^3。

关键词：球磨处理相结构永磁性能居里温度

具有分层耗能机制的斜拉桥顺桥向地震损伤控制

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振动工程学报 2015年第4期28卷 585-592页

作者：谢文孙利民宁波大学建筑工程与环境学院浙江宁波315211 同济大学土木工程防灾国家重点实验室上海200092

提出了具有分层耗能机制的斜拉桥损伤控制策略,即通过辅助墩消耗地震输入能和分担主梁惯性力来保护主塔,再通过附加在墩柱间的耗能构件来保护辅助墩。首先结合中国现行公路桥梁抗震设计规范,定义了斜拉桥构件的损伤性能指标以及各级抗... 详细信息

提出了具有分层耗能机制的斜拉桥损伤控制策略,即通过辅助墩消耗地震输入能和分担主梁惯性力来保护主塔,再通过附加在墩柱间的耗能构件来保护辅助墩。首先结合中国现行公路桥梁抗震设计规范,定义了斜拉桥构件的损伤性能指标以及各级抗震设防水准下的损伤控制目标;然后建立了具有分层耗能机制的斜拉桥顺桥向地震损伤控制方法;最后通过以一座主跨1 400m斜拉桥的试设计算例验证了该控制方法的可行性和有效性。结果表明:附加在墩柱间的耗能构件既可有效控制辅助墩的地震损伤,又可改善辅助墩对主塔的控制效果,使各构件满足各级抗震设防水准下的损伤控制目标。

关键词：大跨度斜拉桥损伤控制方法新型辅助墩耗能构件损伤性能指标

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一类DGH方程的新保结构算法研究

大连理工大学学报 2016年第4期56卷 432-440页

作者：王俊杰普洱学院数学系云南普洱665000 西北大学数学学院陕西西安710127

DGH方程作为一类重要的非线性水波方程有着广泛的应用前景.基于哈密顿系统的多辛理论研究了一类DGH方程的数值解法,利用平均向量场方法对此哈密顿系统进行了数值离散,构造了DGH方程的局部能量保结构算法和局部动量保结构算法.数值算例表... 详细信息

DGH方程作为一类重要的非线性水波方程有着广泛的应用前景.基于哈密顿系统的多辛理论研究了一类DGH方程的数值解法,利用平均向量场方法对此哈密顿系统进行了数值离散,构造了DGH方程的局部能量保结构算法和局部动量保结构算法.数值算例表明,这两种保结构算法具有较好的长时间数值稳定性.

关键词：哈密顿系统保结构算法多辛理论 DGH方程

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一种改进的多模式匹配算法

西安电子科技大学学报 2014年第6期41卷 174-180页

作者：褚衍杰李云照魏强盲信号处理重点实验室四川成都610041

针对WM算法在模式集规模大且最短模式长度小的情况下性能较低的问题,分析了WM算法及其改进的快速WM（QWM）算法的优缺点,在此基础上提出了模式分集思想,并优化了跳跃和确认机制,设计了子集WM（SWM）算法;然后针对该算法在域名过滤中的应... 详细信息

针对WM算法在模式集规模大且最短模式长度小的情况下性能较低的问题,分析了WM算法及其改进的快速WM（QWM）算法的优缺点,在此基础上提出了模式分集思想,并优化了跳跃和确认机制,设计了子集WM（SWM）算法;然后针对该算法在域名过滤中的应用,对hash函数、匹配顺序等进行进一步优化.针对域名过滤的实验结果表明,当模式数量超过10 000条时,SWM算法匹配时间是WM算法的8.9%-11.6%,说明SWM算法在模式集规模较大时,匹配速度能显著提高.

关键词：模式匹配字符串匹配 WM算法 SWM算法域名过滤

炭黑/硅橡胶导电复合材料微观结构及其导电特性

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功能材料 2014年第2期45卷 40-43页

作者：廖波王英杰浙江工商大学技术与工程管理系杭州310018 中国矿业大学深部岩土力学与地下工程国家重点实验室江苏徐州221008

对炭黑/硅橡胶导电复合材料的微观结构及导电特性进行了研究。以液体硅橡胶为绝缘基体、纳米导电炭黑颗粒为填充材料制作的复合材料具有优良的导电特性,通过实验测试获得了不同炭黑含量下复合材料的电阻率,当炭黑质量分数>4%时,可获得... 详细信息

对炭黑/硅橡胶导电复合材料的微观结构及导电特性进行了研究。以液体硅橡胶为绝缘基体、纳米导电炭黑颗粒为填充材料制作的复合材料具有优良的导电特性,通过实验测试获得了不同炭黑含量下复合材料的电阻率,当炭黑质量分数>4%时,可获得较好的导电性。利用电子扫描系统对炭黑颗粒在硅橡胶基体中的微观结构分布进行了观察,观察发现纳米炭黑颗粒主要以"团聚体"及与之相连的"链条"结构两种形式存在,并不是均匀规则的。将"团聚体"与"链条"结构简化为可变形的"大颗粒",在此基础上建立了相应的导电模型。

关键词：硅橡胶炭黑导电复合材料导电特性微观结构

Primary slag formation behavior during reduction process of SFCA-I and SFCA

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Journal of Iron and Steel Research International 2022年第11期29卷 1748-1759页

作者： Fan-jian Meng Chang-yu Sun Ting-le Li Qi Wang State Key Laboratory of Advanced Metallurgy and School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China The Key Laboratory of Chemical Metallurgy Engineering of Liaoning Province and School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina

Because the formation behavior of primary slag which decomposed from complex calcium ferrite(SFCA-I and SFCA)is not quite clear,the migration behavior of CaO and Al_(2)O_(3) derived from high basicity or high alumina sinter is always worth *** reducibility of three representative sinter samples and the formation behavior of primary slag during reduction process were investigated via X-ray diffraction,scanning electron microscopy,and energy-dispersive spectroscopy *** results show that the reducibility of high basicity sinter is superior to that of high alumina *** with poor reducibility like hercynite and brownmillerite and with large-grained particles like free alumina and silica form in sinters with basicity of 2.4 and Al_(2)O_(3) content of 4 wt.%,*** appearance of these minerals can well explain the reduction stagnation phenomenon occurring in these sinter *** migration behavior of CaO and Al_(2)O_(3) during slag formation process is *** can easily combine with SiO2 to form silicate phase or firstly form calcium-rich ferro-aluminate solid solution and then transform to silicate phase,while Al_(2)O_(3) firstly combines with CaO and FeO to form solid solution and then,gradually combines with SiO2 to form calcium aluminum silicate phase.

关键词： Primary slag formation behavior Complex calcium ferrite High basicity sinter High alumina sinter Reducibility

Iron and Zinc Serum Levels in Young Adult Cameroonians after Supplementation in Poor Vitamin A and Controlled Diets

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Journal of Food Science and Engineering 2014年第4期4卷 184-195页

作者： Kana sop Marie Modestin Gouado Inocent Schweigert Florian Van Camp John Oberleas Donald AmvamZollo Paul Henri Tetanye Ekoe Department of Biochemistry Faculty of Science University of Douala Douala 24157 Cameroon Institute of Nutritional Science University of Potsdam Potsdam 114-115 D-14558 Germany Department of Food Safety and Food Quality University of Gent Ghent 653 B-9000 Belgium Food and Nutrition University of Lubbok Lubbock 79423 USA Department of Biochemistry University of Ngaoundere Ngaoundere 454 Cameroon Department of Paediatrics Faculty of Medicine and Biomedical Sciences University of Yaoundd Yaounde 2036 Cameroon

Iron, zinc and vitamin A deficiencies co-exist in Cameroon in all age groups. However, natural sources of vitamin A are available and could be used to meet the need of the whole population in association with iron and zinc supplementation. This study aims at assessing the serum levels of zinc and iron after 11 days of supplementation. The study enrolled 26 men 08-33 years）, distributed into five groups. From the first day, they were supplemented with 20 mg of zinc and iron, taken each alone, both either together or at two different times. The five last days, participants were put on free vitamin A diets. Serums were obtained at day l, day 5 and day 11 for Zn and Fe levels determination by atomic absorption spectrophotometry. The highest serum iron and zinc concentrations were observed in groups either supplemented with zinc or with iron given alone. In those two groups, serum Zn concentrations increased from 0.69 μg/mL ±0.02μg/mL to 0.95 μg/mL ± 0.13 μg/mL （group 2）, from 0.48 μg/mL ± 0.06 μg/mL to 0.97 μg/mL ± 0.11 μg/mL （group 3）; and serum Fe concentrations from 1.49 μg/mL ± 0.54 μg/mL to 3.49 μg/mL ± 1.01 μg/mL （group 2）; and from 1.42 μg/mL ± 0.45 μg/mL to 3.41 μg/mL ± 0.81 μg/mL （group 3）, respectively. Supplementation with Fe or Zn alone increased both Fe and Zn serum levels of participants. Serum levels of iron and zinc when given together or at different time were not significantly different. Further studies on a larger population are necessary to confirm that supplementation with zinc or with iron alone could raise both zinc and iron levels in serum simultaneously.

关键词： Supplementation iron zinc young-adults Cameroon.

A novel phosphorylation site in SARS-CoV-2 nucleocapsid regulates its RNA-binding capacity and phase separation in host cells

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Journal of Molecular Cell Biology 2022年第2期14卷 72-75页

作者： Junyu Wu Yongheng Zhong Xue Liu Xiaoyu Lu Weĳie Zeng Chunyan Wu Fan Xing Liu Cao Fuxiang Zheng Panpan Hou Hong Peng Chunmei Li Deyin Guo Centre for Infection and Immunity Study(CIIS) School of MedicineShenzhen Campus of Sun Yat-sen UniversityShenzhen 518197China

Dear Editor,The severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)is a novel emerging coronavirus that has spread worldwide since breaking out in late 2019 and has led to hundreds of millions of infections an... 详细信息

关键词： acute respiratory

The Future of ASEAN as A Regional Organization

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The Future of ASEAN as A Regional Organization

作者： MD AR-RIFA’ie PD HALBI 山东大学

学位级别：硕士

With the exception of the European Union（EU）,the Association of Southeast Asian Nations（ASEAN）is certainly the most successful example of a regional grouping in the *** of ten states in a region that is typified by an extensive difference of ethnicities with different norms,values,religions and languages,ASEAN has successfully attained economic success and peace in a region that has a rich history of *** its initial establishment and potential role and influence were undermined by external observers,ASEAN has definitely proven its doubters wrong throughout its 50-year existence,with the Association managing to adjust to the varying circumstances in geopolitics and economics,becoming a calming force in advocating peace and security,as well as helping to boost the economic growth of its *** addition to this,ASEAN,as a regional organization,also saw a milestone in its integration process,with the establishment of the ASEAN Community in 2015,which is based on three pillars pertaining to economy,political-security,and ***,in spite of these successes,the integration process in ASEAN still goes through much debate by external observers and scholars alike,and rightfully *** is because the integration process in ASEAN has been mainly steered by the self-interests of states,such as sovereignty,security,and regime survival,instead of a shared goal of regional *** forms of integration in the region,such as the establishment of the AFT A and the ASEAN Community,although showing the steps ASEAN has taken to integrate its members,have been considerably limited with the Association still upholding the same principles that guided it through the 20th to the 21st *** example,in terms of the principle of conflict avoidance,although ensuring stability in the short term,these unresolved conflicts have the potential to destabilize integration in the future,thus weakening ASEAN in the ***,the

关键词： A REGIONAL ORGANIZATION FUTURE ASEAN