检索结果-南通市图书馆

Frontiers of Environmental Science & Engineering 2016年第3期10卷 467-476页

作者： Jiawei JU Ruiping LIU zan he Huijuan LIU Xiwang ZHANG Jiuhui QU State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100039 China Department of Chemical Engineering Monash University Clayton VIC 3800 Australia

Although Al-based coagulation and adsorption processes have been proved highly efficient for fluoride （F） removal, the two processes both generate large amount of AI（OH）3 solid waste containing F （Al（OH）3-F）. This study aimed to investigate the feasibility of utilizing AI（OH）3-F generated in AI（OH）3 adsorption （Al（OH）3-Fads） and coagulation （Al（OH）3-Fcoag） for the adsorption of cadmium ion （Cd（II））. The adsorption capacity of AI（OH）3- Fads and Al（OH）a-Fcoag for Cd（II） was similar as that of pristine aluminum hydroxide （AI（OH）3）, being of 24.39 and 19.90 mg·g^-1, respectively. The adsorption of Cd（II） onto AI（OH）a-Fads and AI（OH）a-Fcoag was identified to be dominated by ion-exchange with sodium ion （Na^＋） or hydrogen ion （H^＋）, surface microprecitation, and electrostatic attraction. The maximum concentration of the leached fluoride from Al（OH）a-Fads and Al（OH）3-Feoag is below the Chinese Class-I Industrial Wastewater Discharge Standard for fluoride （〈 10mg·L^-1）. This study demonstrates that the AI（OH）3 solid wastes generated in fluoride removal process could be potentially utilized as a adsorbent for Cd（II） removal.

关键词： Al(OH)3 fluoride cadmium adsorption reclamation sequential extraction

Effects of fluoride on the removal of cadmium and phosphate by aluminum coagulation

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第6期27卷 118-125页

作者： Ruiping Liu Bao Liu Lijun Zhu zan he Jiawei Ju Huachun Lan Huijuan Liu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences

This study focuses on the effects of p H and fluoride at different molar ratios of fluoride to Al（R F：Al） on the removal of cadmium（Cd^（2＋）） and phosphate by Al coagulation. Fluoride at R F：Al≥ 3：1 inhibits the removal of Cd over wide Al dose ranges from 5 to 10 mg/L as Al. The removal of phosphate decreases significantly at high R F：Al of 10：1 whereas at lowered R F：Al（i.e., ≤ 6：1）, an adverse effect is observed only at insufficient Al doses below 2 mg/L. Fluoride shows inhibitive effects towards the removal of Cd at p H 7 and 8 and that of phosphate at p H 6. Fluoride decreases the ζ-potential in both systems, and the decreasing extent is positively correlated to the elevated R F：Al. The Al fluoride interactions include the formation of Al-F complexes and the adsorption of fluoride onto Al（OH）3 precipitates, i.e., the formation of Al（OH）n F m. Al-F complex formation inhibits Al hydrolysis and increases residual Al levels, and a more significant increase was observed at lower p H. Al-F complexes at high R F：Al complicate the coagulation behavior of Al towards both negative and positive ionic species. Moreover, fluoride at low R F：Al shows little effect on Al coagulation behavior towards Cd^2＋and phosphate, and the spent defluoridation adsorbent,i.e., aluminum（Al） hydro（oxide） with adsorbed fluoride at R F：Al of below 0.1：1, may be reclaimed as a coagulant after being dissolved.

关键词： Fluoride Aluminum coagulation Al-F complexes ζ-Potential Adsorbent reclamation

Interfacial microstructure and mechanical properties of Ti-6Al-4V/Al7050 joints fabricated using the insert molding method

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2017年第12期24卷 1412-1423页

作者： Hong-xiang Li Xin-yu Nie zan-bing he Kang-ning Zhao Qiang Du Ji-shan Zhang Lin-zhong Zhuang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China SINTEF Materials and Chemistry Pb.124 BlindernNO-0314 OsloNorway IJmuiden Technology Centre Tata Steel Research&Development1970 CA IJmuidenThe Netherlands

Ti-6Al-4V/Al7050 joints were fabricated by a method of insert molding and corresponding interfacial microstructure and mechanical properties were investigated. The interfacial thickness was sensitive to holding temperature during the first stage, and a good metallurgical bonding interface with a thickness of about 90 μm can be obtained at 750°C. X-ray diffraction, transmission electron microscopy, and thermodynamic analyses showed that the interface mainly contained intermetallic compound TiAl_3 and Al matrix. The joints featured good mechanical properties, i.e., shear strength of 154 MPa, tensile strength of 215 MPa, and compressive strength of 283 MPa, which are superior to those of joints fabricated by other methods. Coherent boundaries between Al/TiAl_3 and TiAl_3/Ti were confirmed to contribute to outstanding interfacial mechanical properties and also explained constant fracture occurrence in the Al matrix. Follow-up studies should focus on improving mechanical properties of the Al matrix by deformation and heat treatment.

关键词： interfacial microstructure interfacial bonding mechanism mechanical properties insert molding method coherent boundaries Ti/Al joints

Structure Evolution of Bulk Metallic Glass Zr_(52.5)Ni_(14.6)Al_10Cu_(17.9)Ti_5 during Annealing

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2000年第4期16卷 357-361页

作者： Guo he, zan BIAN and Guoliang CheN (State Key Laboratory of Advanced Metals and Materials, University of Science and Technology Beijing,Beijing 100083, China) State Key Laboratory of Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

Bulk metallic glass Zr_52.5Ni_14.6Al_10Cu_17.9Ti_5 was prepared by melt injection casting method. Its glass transition and crystallization temperatures were determined by differential scanning calorimetry (DSC) to be 631 K and 710 K respectively. By analysis of X-ray diffractometry (XRD) and transmission electron microscopy (TEM ), the predominant crystallized phase of Zr_2Ni0.67O0.33 distributed on glass state matrix was detected after annealing at 673 K for 600 s. The transformation to Zr_2Ni_0.67O_0.33 and a small amount of ZrAl and Zr_2Cu took place after annealing for 600 s at temperature from 703 K to 723 K. With increasing annealing temperature from 753 K to 823 K, the amounts of ZrAl and Zr_2Cu increased, but the size of the crystals did not significantly change. The transformation to Zr_2Ni_0.67O_0.33 is interface-controlled, but is diffusion-controlled to Zr_2Cu and ZrAl. With increasing annealing temperature up to 200 K above T_x, the nanometer grains became very fine because of the increase of nucleation rate for Zr_2Cu and ZrAl.

关键词： Structure Evolution of Bulk Metallic Glass Zr Ti5 during Annealing Al10Cu Ni Cu

在线全文

学校读者我要写书评

暂无评论

专属经济区内的有限军事活动自由

政法论坛 2015年第4期33卷 160-167页

作者：贺赞华南师范大学法学院

专属经济区内的外国军事活动是否属于1982年《联合国海洋法公约》第87条规定的专属经济区航行飞越自由,或与这些自由有关的海洋其他国际合法用途?沿海国是否有权规制其专属经济区内的外国军事活动?《公约》并未明确禁止外国在沿海国专... 详细信息

专属经济区内的外国军事活动是否属于1982年《联合国海洋法公约》第87条规定的专属经济区航行飞越自由,或与这些自由有关的海洋其他国际合法用途?沿海国是否有权规制其专属经济区内的外国军事活动?《公约》并未明确禁止外国在沿海国专属经济区的军事活动,但《公约》中和平利用海洋等规定表明外国军事活动并非绝对的自由;海洋安全形势的变化也对条约解释提出了新的要求;有关国家实践更为条约解释及习惯国际法的产生提供了基础。中国在专属经济区内对外国军事活动进行规制,同时在外国专属经济区内有限度地从事军事活动,这一最新实践顺应了国际海洋法的发展趋势。

关键词：军事活动适当顾及和平目的国家实践

Degeneration Directory:a multi-omics web resource for degenerative diseases

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2024年第5期15卷 385-392页

作者： Haoteng Yan Changfa Lu Chenyang Lan Si Wang Weiqi Zhang zan he Jinghao Hu Jiaqi Ai Guang-Hui Liu Shuai Ma Yuanchun Zhou Jing Qu State Key Laboratory of Membrane Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China State Key Laboratory of Stem Cell and Reproductive Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China Key Laboratory of Organ Regeneration and Reconstruction Institute of ZoologyChinese Academy of SciencesBeijing 100101China Advanced Innovation Center for Human Brain Protection and National Clinical Research Center for Geriatric DisordersXuanwu Hospital Capital Medical UniversityBeijing 100053China Aging Translational Medicine Center International Center for Aging and CancerBeijing Municipal Geriatric Medical Research CenterXuanwu HospitalCapital Medical UniversityBeijing 100053China Computer Network Information Center Chinese Academy of SciencesBeijing 100190China The Fifth People’s Hospital of Chongqing Chongqing 400062China Aging Biomarker Consortium Beijing 100101China CAS Key Laboratory of Genomic and Precision Medicine Beijing Institute of GenomicsChinese Academy of Sciences and China National Center for BioinformationBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Sino-Danish College University of Chinese Academy of SciencesBeijing 101408China Beijing Institute for Stem Cell and Regenerative Medicine Beijing 100101China Institute for Stem Cell and Regeneration Chinese Academy of SciencesBeijing 100101China

Background of *** degeneration refers to the gradual decline in organ function and structure deterioration that occurs during aging,which represents the greatest risk factor for various degenerative diseases,including cardiovascular diseases,neurodegenerative diseases,and osteoarthritis,etc.(Aging Biomarker et al.,2023;Becker et al.,2018;Cai et al.,2022).

关键词： Directory web Becker

在线全文

学校读者我要写书评

暂无评论

超燃燃烧室中燃烧反应区域变化情况试验

航空动力学报 2023年第10期38卷 2370-2382页

作者：何赞乐嘉陵田野钟富宇中国空气动力研究与发展中心空天技术研究所四川绵阳621000

运用试验的方式在来流马赫数为2.5的条件下研究了气态燃料在直连式凹腔燃烧室内的燃烧过程,结合壁面压力测量以及OH-PLIF(OH-平面激光诱导荧光系统)方法分析了乙烯燃料在点火后1 ms内的燃烧反应区域发展过程和氢气燃料在稳焰时1 ms内的... 详细信息

运用试验的方式在来流马赫数为2.5的条件下研究了气态燃料在直连式凹腔燃烧室内的燃烧过程,结合壁面压力测量以及OH-PLIF(OH-平面激光诱导荧光系统)方法分析了乙烯燃料在点火后1 ms内的燃烧反应区域发展过程和氢气燃料在稳焰时1 ms内的燃烧反应区域变化过程。结果表明凹腔后缘斜坡对于气态燃料的火焰传播起重要作用,初始燃烧区域在随来流到达后斜坡后会减速滞留,为附近的燃料提供适宜的点火环境。凹腔剪切层对气态燃料的稳焰燃烧起重要作用,剪切层内始终部分存在剧烈燃烧反应区域,这将为凹腔内部源源不断地提供点火能量,为维持凹腔内部燃料持续点火燃烧提供能源支撑。试验测得乙烯初始燃烧反应区域向凹腔上游的发展速度约为170 m/s。

关键词：超燃燃烧室氢气乙烯平面激光诱导荧光系统(PLIF) 燃烧反应区域

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

一种实用的风力机叶片气动设计方法研究

空气动力学学报 2012年第3期30卷 411-414,379页

作者：昝丙合杨旭东西北工业大学翼型叶栅国家重点实验室陕西西安710072

提出了水平轴风力机叶片的优化设计模型,该模型以风轮平均年能量输出最大为设计目标,并将风速的概率分布考虑进来。为了获得较好的优化结果,首先采用PROPID程序对叶片进行反设计,获得较好性能的叶片几何,在此基础上,运用遗传算法进行搜... 详细信息

提出了水平轴风力机叶片的优化设计模型,该模型以风轮平均年能量输出最大为设计目标,并将风速的概率分布考虑进来。为了获得较好的优化结果,首先采用PROPID程序对叶片进行反设计,获得较好性能的叶片几何,在此基础上,运用遗传算法进行搜索寻优,这样不仅减小了搜索的范围,也降低了搜索的时间。对叶片面积附加约束,以获得符合实际的叶片,采用5阶贝塞尔函数在设计点之间进行插值,以获得光滑的几何外形。利用该方法优化设计了600kW风力机叶片。与已有叶片相比,优化结果显示了明显的优越性,验证了该优化方法的有效性和实用性。

关键词：风力机优化设计反设计 PROPID 遗传算法

磁悬浮控制力矩陀螺高速电机绕组涡流损耗计算及热分析

在线全文

学校读者我要写书评

暂无评论

光学精密工程 2020年第1期28卷 130-140页

作者：韩邦成彭松贺赞刘旭张旭北京航空航天大学惯性技术重点实验室北京100191 北京航空航天大学新型惯性仪表与导航系统技术国防重点学科实验室北京100191 北京市高速磁悬浮电机技术及应用工程技术研究中心北京100191

为了更准确地预测磁悬浮控制力矩陀螺中高速电机工作时的温升,需要计算电机绕组涡流损耗和对陀螺进行热分析。本文以最大角动量200 N·m·s,额定转速12000 r/min的磁悬浮控制力矩陀螺为研究对象,首先分析了电机绕组涡流产生原理,采用了... 详细信息

为了更准确地预测磁悬浮控制力矩陀螺中高速电机工作时的温升,需要计算电机绕组涡流损耗和对陀螺进行热分析。本文以最大角动量200 N·m·s,额定转速12000 r/min的磁悬浮控制力矩陀螺为研究对象,首先分析了电机绕组涡流产生原理,采用了一种解析法和有限元法结合的方法,推导并计算了高速电机绕组涡流损耗。然后,建立了陀螺三维有限元模型,在已知陀螺各部件损耗的基础上进行了热分析,得到了温度仿真分布。最后,设计了陀螺样机温升实验进行验证。仿真分析得知高速电机定子温度最高,定子绕组温度为40.3℃。温升实验测得电机定子温度为41.6℃,与理论值误差为3.1%。这相比未考虑绕组涡流损耗时的热分析,精度提高了3.7%。考虑了绕组涡流损耗的热分析预测温升更加准确,这对于优化磁悬浮控制力矩陀螺的热设计有重要意义。

关键词：磁悬浮控制力矩陀螺永磁无刷直流电机涡流损耗有限元热分析

单框架磁悬浮控制力矩陀螺的损耗计算及热-结构耦合分析

在线全文

学校读者我要写书评

暂无评论

光学精密工程 2018年第10期26卷 2463-2474页

作者：韩邦成贺赞翟鲁鑫张旭刘旭北京航空航天大学惯性技术重点实验室北京100191 北京航空航天大学新型惯性仪表与导航系统技术国防重点学科实验室北京100191 北京市高速磁悬浮电机技术及应用工程技术研究中心北京100191

为了明确由损耗导致航天器应用中的磁悬浮控制力矩陀螺温升问题,需要对损耗和温度分布进行分析计算。本文针对额定转速12 000 r/m,最大角动量200 N·m·s的单框架磁悬浮控制力矩陀螺,通过建立理论模型进行分析计算,得到了框架力矩电机... 详细信息

为了明确由损耗导致航天器应用中的磁悬浮控制力矩陀螺温升问题,需要对损耗和温度分布进行分析计算。本文针对额定转速12 000 r/m,最大角动量200 N·m·s的单框架磁悬浮控制力矩陀螺,通过建立理论模型进行分析计算,得到了框架力矩电机、径向磁轴承、轴向磁轴承和转子高速电机的铁损以及铜损;对陀螺三维有限元模型进行了热场仿真分析,得到在各类损耗影响下的温度分布,并进行了热-结构耦合仿真分析。分析得到最大温度位于高速电机定子,最大温度是48.3℃;最后,进行了样机温升实验验证,检测温度最大值位于高速电机定子,最大值为51.8℃,与计算值误差为6.8%。通过温升检测实验验证了损耗计算和有限元热场分析。实验结论为整体结构优化提供了理论参考。

关键词：磁悬浮控制力矩陀螺损耗计算热场分析有限元分析