检索结果-南通市图书馆

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

膜蒸馏处理滤池反冲洗废水的效能研究

中国给水排水 2024年第9期40卷 50-55页

作者：许航王澳丁明梅马珺张磊梅才华河海大学环境学院江苏南京210009 滁州学院土木与建筑工程学院安徽滁州239099

采用膜蒸馏(MD)工艺,考察了聚偏氟乙烯(PVDF)、聚四氟乙烯(PTFE)和聚丙烯(PP)3种材质的疏水膜对滤池反冲洗废水的处理效果。结果表明,PTFE膜的性能最佳,在60℃下能保持(15.2±0.8)L/(m^(2)·h)的渗透通量,并可稳定截留99%的无机离子和80... 详细信息

采用膜蒸馏(MD)工艺,考察了聚偏氟乙烯(PVDF)、聚四氟乙烯(PTFE)和聚丙烯(PP)3种材质的疏水膜对滤池反冲洗废水的处理效果。结果表明,PTFE膜的性能最佳,在60℃下能保持(15.2±0.8)L/(m^(2)·h)的渗透通量,并可稳定截留99%的无机离子和80%以上的有机污染物。另外,从工艺优化角度考察了不同预处理方式和进水模式对MD工艺运行的影响,结果表明,混凝沉淀预处理方式能够有效减缓膜结垢,在168 h的运行周期下PTFE膜通量仅下降了35%;与持续浓缩的进水模式相比,间歇进水初期的膜通量下降幅度更大,但每24 h稀释进料后都出现膜通量突增使整体产水量高于连续进水模式总量的5%左右。采用SEM和FTIR分析得出,PTFE膜污染成因是无机盐结晶和腐殖酸类有机污染。

关键词：膜蒸馏滤池反冲洗废水废水回用膜通量膜污染

正交实验方法在燃料元件性能分析测试算例设计中的应用

在线全文

学校读者我要写书评

暂无评论

核动力工程 2024年第5期45卷 249-255页

作者：何康年丁铭郭泽华朱亚楠魏超哈尔滨工程大学黑龙江省核动力装置性能与设备重点实验室哈尔滨150001 中广核研究院有限公司广东深圳518026 生态环境部核与辐射安全中心北京100082

为了评估参数不确定度给燃料元件性能带来的影响,需要对设计阶段的燃料元件误差范围内参数组合进行计算和评估。采用正交实验方法对棒状燃料元件关键参数进行组合取值并编制测试算例,以评估参数不确定度对燃料元件行为的影响。根据选取... 详细信息

为了评估参数不确定度给燃料元件性能带来的影响,需要对设计阶段的燃料元件误差范围内参数组合进行计算和评估。采用正交实验方法对棒状燃料元件关键参数进行组合取值并编制测试算例,以评估参数不确定度对燃料元件行为的影响。根据选取的关键设计参数和各参数水平编制混合水平正交表,并确定36组测试算例。对36个算例进行测试计算,结果表明部分测试算例的包壳总变形不满足燃料棒设计准则,说明参数不确定度对燃料元件行为产生了负面影响。测试算例的编制和分析对燃料元件设计具有一定的指导意义。

关键词：棒状燃料元件正交实验方法正交表敏感性分析燃料元件性能分析

Measurements of spectral lines observed with Hinode/EIS as implications for coronal heating

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2009年第7期9卷 829-840页

作者： Ying Li ming-De ding Department of Astronomy Nanjing University Nanjing 210093 China

We have measured the line widths and nonthermal velocities in 12 solar regions using high resolution EUV data taken by Hinode/EIS. We find that there exists a positive correlation between the intensity and nonthermal velocity for the Fe xII emission line as well as some other lines. The correlation coefficients decrease from the disk center to the limb. However, the nonthermal velocities of a particular spectral line do not vary much in different regions, so they are considered isotropic. In particular, we find that for a coronal loop structure, the largest widths and nonthermal velocities occur at the footpoints, where outflows appear. Based on these observational results, we discuss several physical processes responsible for coronal heating.

关键词： line: profiles - Sun: corona - Sun: UV radiation

Physical Parameters of a Flare Derived from Multi-line 2D Spectroscopy

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2001年第5期1卷 460-468页

作者： YingLiu ming－De－ding DepartmentofAstronomy NanjingUniversityNanjing210093 DepartmentofAstronomy NanjingUniversityNanjing

Time series of 2D spectra of Hα and CaⅡ λ8542 for a flare of 1999 December 22 are obtained and analyzed with a new fitting technique. The method we proposed can simultaneously yield the four parameters: the line source function, the optical thickness at line center, the line-of sight velocity and the Doppler width. We present the spatial distributions of the physical parameters and their temporal evolutions determined from the 2D spectra. Our results are consistent with the general picture predicted by the flare dynamic models.

关键词： Sun: flares - Sun: chromosphere

Interaction and eruption of two filaments observed by Hinode, SOHO, and STEREO

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第3期12卷 287-299页

作者： Ying Li ming-De ding School of Astronomy and Space Science Nanjing UniversityNanjing 210093China Key Laboratory for Modern Astronomy and Astrophysics(Nanjing University) Ministry of EducationNanjing 210093China

We investigate the interaction between two filaments and the subsequent filament eruption event observed from different viewing angles by Hinode, the Solar and Heliospheric Observatory, and the Solar Terrestrial Relations Observatory. In the event, the two filaments rose high, interacted with each other, and finally were ejected along two different paths. We measure the bulk-flow velocity using spectroscopic data. We find significant outflows at the speed of a few hundreds of km s 1 during the filament eruption, and also some downflows at a few tens of km s-1 at the edge of the eruption region in the late stage of the eruption. The erupting material was composed of plasmas with a wide temperature range of 10-4–106 K. These results shed light on the filament nature and the coronal dynamics.

关键词： line: profiles—Sun: corona—Sun: filaments—Sun: flares—Sun: UV radiation

Feasibility neutronic design for the reactor core configurations of a 5 MWth transportable block-type HTR

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2013年第4期24卷 75-80页

作者： ding ming KLOOSTERMAN Jan Leen College of Nuclear Science and Technology Harbin Engineering University Reactor Institute Delft Delft University of Technology

Small long-life transportable high temperature gas-cooled reactors(HTRs) are interesting because they can safely provide electricity or heat in remote areas or to industrial users in developed or developing *** paper presents the neutronic design of the U-Battery,which is a 5 MWth block-type HTR with a fuel lifetime of 5–10 *** a reactor pressure vessel diameter of less than 3.7 m,some possible reactor core configurations of the 5 MWth U-Battery have been investigated using the TRITON module in SCALE *** neutronic analysis shows that Layout 12×2B,a scattering core containing 2 layers of 12 fuel blocks each with 20% enriched235U,reaches a fuel lifetime of 10 effective full power years(EFPYs).When the diameter of the reactor pressure vessel is reduced to 1.8 m,a fuel lifetime of 4 EFPYs will be achieved for the 5 MWth U-Battery with a 25-cm thick graphite side *** 6×3 and 6×4 with a 25-cm thick BeO side reflector achieve a fuel lifetime of 7 and 10 EFPYs,*** comparison of the different core configurations shows that,keeping the number of fuel blocks in the reactor core constant,the annular and scattering core configurations have longer fuel lifetimes and lower fuel cost than the cylindrical ***,for the 5 MWth U-Battery,reducing the fuel inventory in the reactor core by decreasing the diameter of fuel kernels and packing fraction of TRISO particles is more effective to lower the fuel cost than decreasing the 235U enrichment.

关键词：高温气冷反应堆堆芯中子设计反应堆压力容器 HTR 可移动燃料成本

高寒草甸重度退化阶段土壤碳氮磷生态化学计量特征及驱动因素

在线全文

学校读者我要写书评

暂无评论

环境科学 2024年第10期45卷 6050-6060页

作者：吴宇萍丁明军张华张月菊徐欢黄鹏江西师范大学地理与环境学院南昌330022 江西师范大学鄱阳湖湿地与流域研究教育部重点实验室南昌330022

深入了解土壤营养状况及平衡关系有助于高寒退化草地的有效恢复和管理.为了研究草甸重度退化阶段土壤碳、氮、磷营养元素之间的平衡关系,采用实地采样调查、室内分析和数理统计等方法,探讨了三江源地区高寒草甸重度退化阶段土壤碳氮磷... 详细信息

深入了解土壤营养状况及平衡关系有助于高寒退化草地的有效恢复和管理.为了研究草甸重度退化阶段土壤碳、氮、磷营养元素之间的平衡关系,采用实地采样调查、室内分析和数理统计等方法,探讨了三江源地区高寒草甸重度退化阶段土壤碳氮磷含量、储量及生态化学计量变化特征及驱动因素.结果表明,在重度退化阶段,杂类草植物占据绝对优势地位,土壤C∶N∶P约为32.83∶3.87∶0.67,存在一定的氮限制,土壤碳氮磷含量变异系数排序为:有机碳(1.09)>全氮(0.63)>全磷(0.29);有机碳含量和碳氮比随草地退化指数(GDI)的增加表现为显著线性下降的趋势,而全磷含量和有机碳储量表现为显著的非线性变化,其中全磷含量表现为显著的平缓U型分布,有机碳储量在重度退化阶段初期下降较为平缓,而当GDI为57.9时,急剧下降.Mantel相关分析结果表明,土壤碳氮比、碳磷比和氮磷比与有机碳含量及储量和全氮储量表现为显著的相关关系.结构方程模型结果表明,土壤含水量直接影响以及通过植被因子间接影响土壤碳氮磷生态化学计量比,土壤含水量和植被因子(高度、盖度和生物量)是影响土壤生态化学计量的关键环境因子.研究结果可为高寒草甸重度退化草地的恢复提供科学依据和实践指导.

关键词：青藏高原高寒草甸重度退化生态化学计量驱动因素

Kinematics of Non-axially Positioned Vesicles through a Pore

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第7期38卷 776-783,I0008页

作者： Yun-Long Han ming-ming ding Rui Li Tong-Fei Shi School of Materials Science and Engineering Changchun University of Science and TechnologyChangchun 130022China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

We employ finite element method to investigate the kinematics of non-axially positioned vesicles through a *** complete the coupling between fluid flow and the vesicle membranes,we use the fluid structure interactions with the arbitrary Lagrangian Eulerian *** results demonstrate that the vesicles show different deformations in migration process,in turn an oblique ellipse-shape,slipper-shape,*** find that the rotation angle of non-axially positioned vesicles mainly shows the trend of increase,besides the small fluctuation induced by deformation ***,when the vesicles move towards the axis of the channel,the rotation angle exhibits a decrease because of the decrease of the shear ***,rotation of axially positioned vesicles hardly occur due to symmetrical shear *** results further indicate that the rotation is faster nearby the pore for non-axially positioned *** work answers the mapping between the positions of vesicles and deformed states,as well as the change of rotation angle and rotation velocity,which can provide helpful information on the utilization of vesicles in pharmaceutical,chemical,and physiological processes.

关键词： Vesicles Narrow pore Rotation angle Rotation velocity

Conformation of an Amphiphilic Comb-like Copolymer in a Selective Solvent

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2023年第9期41卷 1386-1391,I0006页

作者： Peng Hao Xing-Hong Mai Qiao-Yue Chen ming-ming ding Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matter Physics College of Physical Science and TechnologyYili Normal UniversityYining835000China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou510006China

We study the conformation of an amphiphilic comb-like copolymer in a selective solvent by using Brownian dynamics *** results demonstrate that,there is an optimal total degree of polymerization to form spherical *** when the total degree of polymerization is less than the optimal total degree of polymerization,a unimolecular spherical micelle can be formed,otherwise,the spherical micelle will be transformed into a cylindrical *** the total degree of polymerization is less than the optimal total degree of polymerization,the radius of gyration and the stretching factor meet an exponential relationship,where the power exponent decreases with the increase of the length of hydrophilic side *** fundamental principles uncovered here afford insights for the optimization of molecular design of amphiphilic comb-like copolymers in various applications.

关键词： Comb-like copolymer Conformation Selective solvent Brownian dynamics