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Acoustical properties of a 3D printed honeycomb structure filled with nanofillers:Experimental a.a.ysis and optimization for emerging applications

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Defence Technology（防务技术） 2024年第5期35卷 248-258页

作者： Jeyanthi Subra.a.ian Vinoth kumar Selva.a. Rohan Singh Ilangovan S Naresh Kakur ruban Whenish School of Mechanical Engineering Vellore Institute of TechnologyChennai600127Tamil NaduIndia Department of Mechanical Engineering SRM Institute of Science and TechnologyRamapuramChennai600089India Department of Chemical Engineering and Materials Science University of Southern CaliforniaLos Angeles90089USA Advanced Materials Research Centre Technology Innovation InstituteAbu Dhabi9639UAE Center for Biomaterials Cellular and Molecular TheranosticsVellore Institute of TechnologyVellore632014Tamil NaduIndia

The novelty of this research lies in the successful fabrication of a 3D-printed honeycomb structure filled with nanofillers for acoustic properties,utilizing an impedance tube setup in accordance with ASTM standard E *** Creality Ender-3,a 3D printer,was used for printing the honeycomb structures,and polylactic acid(PLA)material was employed for their *** organic,inorganic,and polymeric compounds within the composites were identified using fourier transformation infrared(FTIR)*** structure and homogeneity of the samples were examined using a field emission scanning electron microscope(FESEM).To determine the sound absorption coefficient of the 3D printed honeycomb structure,numerous samples were systematically developed using central composite design(CCD)and a.a.ysed using response surface methodology(RSM).The RSM mathematical model was established to predict the optimum values of each factor and noise reduction coefficient(NRC).The optimum values for an NRC of 0.377 were found to be 1.116 wt% carbon black,1.025 wt% aluminium powder,and 3.151 mm distance between pa.a.lel ***,the results demonstrate that a 3Dprinted honeycomb structure filled with nanofillers is an excellent material that can be utilized in various fields,including defence and aviation,where lightweight and acoustic properties are of great importance.

关键词： 3D printing Honeycomb structure Acoustics Field emission scanning electron microscope Response surface methodology

VEPP-2000正负电子对撞机上CMD-3物理结果综述（英文）

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中国科学技术大学学报 2016年第4期46卷 259-271页

作者： FEDOTOVICH G.V. AMIRKHANOV A.N. ANISENKOV A.V. AULCHENKO V.M. BANZAROV V.S. BASHTOVOY N.S. BONDAR A.E. BRAGIN A.V. EIDELMAN S.I. EPIFANOV D.A. EPSHTEYN L.B. EROFEEV A.L. Ga.a.OV S.E. GREBENUK a.a. GRIBANOV S.S. GRIGORIEV D.N. IGNATOV F.V. IVANOV V.L. KARPOV S.V. Ka.a.IN V.F. KOROBOV a.a. KOVALENKO O.A. KOZYREV A.N. KOZYREV E.A. KROKOVNY P.P. KUZMENKO A.E. KUZMIN A.S. LOGASHENKO I.B. LUKIN P.A. MIKHAILOV K.Yu. OKHAPKINV.S. PESTOVYu.N. POPOV A.S. RAZUVAEV G.P. ruban a.a. RYSKULOV N.M. RYZHENENKOV A.E. SHEBALIN V.E. SHEMYAKIN D.N. SHWARTZ B.A. SIBIDANOV A.L. SHATUNOV Yu.M. SOLODOV E.P. TITOV V.M. TALYSHEV a.a. VOROBIOV A.I. YUDIN Yu.V. 布德克尔核物理研究所新西伯利亚州立大学新西伯利亚州立理工大学悉尼大学物理学院福基纳高能物理系

2010年12月VEPP-2000正负电子对撞机上的CMD-3探测器开始运行.在质心系能量区间0.32~2GeV范围内,已经获取了积分亮度约为60pb-1的数据.目前已经得到多种强子末态截面的初步结果,尤其是e^+e^-→π^+π^-,π^+π^-π~0,K_LK_S,K^+K^-,ηγ... 详细信息

2010年12月VEPP-2000正负电子对撞机上的CMD-3探测器开始运行.在质心系能量区间0.32~2GeV范围内,已经获取了积分亮度约为60pb-1的数据.目前已经得到多种强子末态截面的初步结果,尤其是e^+e^-→π^+π^-,π^+π^-π~0,K_LK_S,K^+K^-,ηγ,3(π^+π^-),2(π^+π^-π~0),K^+K^-π^+π^-,K^+K^-η,K^+K^-π0,ηπ^+π^-,ωπ^+π^-和ω→π~0e^+e^-.为正确描述角分布和不变质量分布及截面分布,多强子末态过程必须考虑其中间共振态.

关键词：强子信号/本底分离截面

用CMD-3谱仪研究VEPP-2000对撞机上的e^+e^-→K^+K^-η过程（英文）

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中国科学技术大学学报 2016年第6期46卷 502-506页

作者： IVANOV V.L. AMIRKHANOV A.N. ANISENKOV A.V. AULCHENKO V.M. BANZAROV V.S. BASHTOVOY N.S. BERKAEV D.E. BONDAR A.E. BRAGIN A.V. EIDELMAN S.I. EPIFANOV D.A. EPSHTEYN L.B. EROFEEV A.L. FEDOTOVICH G.V. Ga.a.OV S.E. GREBENUK a.a. GRIBANOV S.S. GRIGORIEV D.N. IGNATOV F.V. KARPOV S.V. Ka.a.IN V.F. KOROBOV a.a. KOVALENKO O.A. KOZYREV A.N. KOZYREV E.A. KROKOVNY P.P. KUZMENKO A.E. KUZMIN A.S. LOGASHENKO I.B. LUKIN P.A. MIKHAILOV K.YU. OKHAPKIN V.S. PESTOVY U.N. POPOV A.S. RAZUVAEV G.P. ruban a.a. RYSKULOV N.M. RYZHENENKOV A.E. SHEBALIN V.E. SHEMYAKIN D.N. SHWARTZ B.A. SIBIDANOV A.L. SHATUNOVY U.M. SOLODOV E.P. TITOV V.M. TALYSHEV a.a. VOROBIOV A.I. YUDINY U.V. 俄罗斯布德克尔核物理研究所国立新西伯利亚大学国立新西伯利亚理工大学悉尼大学物理学院高能物理系

报道了用CMD-3在2011-2012年收集的积分亮度为22 pb-1的研究结果.在CMD-3当前的统计量下,只能被确定Ф(1020)η中间共振态.在1.59-2.0 Ge V能区的30个能量点测量了e^+e^-→Ф(1020)η.分析中,将η介子当做反冲粒子,穷尽了η衰变的所有模... 详细信息

报道了用CMD-3在2011-2012年收集的积分亮度为22 pb-1的研究结果.在CMD-3当前的统计量下,只能被确定Ф(1020)η中间共振态.在1.59-2.0 Ge V能区的30个能量点测量了e^+e^-→Ф(1020)η.分析中,将η介子当做反冲粒子,穷尽了η衰变的所有模式,选出的事例总数为1454±48.测量的截面近似为Ф(1680)和非共振振幅按照矢量介子主导模型的叠加,并得到了Ф(1680)介子共振参数的初步结果.

关键词：强子信号/本地分离截面

CMD-3实验π介子形状因子的初步结果（英文）

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中国科学技术大学学报 2016年第4期46卷 323-330页

作者： AKHMETSHIN R.R. AMIRKHANOV A.N. ANISENKOV A.V. AULCHENKO V.M. BANZAROV V.Sh. BASHTOVOY N.S. BERKAEV D.E. BONDAR A.E. BRAGIN A.V. FEDOTOVICH G.V. EIDELMAN S.I. EPIFANOV D.A. EPSHTEYN L.B. EROFEEV A.L. Ga.a.OV S.E. GREBENUKV a.a. GRIBANOVV S.S. GRIGORIEV D.N. IGNATOV F.V. IVANOV V.L. KARPOV S.V. Ka.a.IN V.F. KHAZIN B.I. KOOP I.A. KOROBOV a.a. KOVALENKO O.A. KOZYREV A.N. KOZYREV E.A. KROKOVNY P.P. KUZMENKO A.E. KUZMIN A.S. LOGASHENKO I.B. LUKIN P.A. MIKHAILOV K.Yu. OKHAPKIN V.S. PESTOV Yu.N. POPOV A.S. RAZUVAEV G.P. ruban a.a. RYSKULOV N.M. RYZHENENKOV A.E. SHEBALIN V.E. SHWARTZ B.A. SHWARTZ D.B. SIBIDANOV A.L. SHATUNOV Yu.M. SOLODOV E.P. SHEMYAKIN D.N. TITOV V.M. TALYSHEV a.a. VOROBIOV A.I. YUDIN Yu.V. 布德克尔核物理研究所新西伯利亚州立大学新西伯利亚州立理工大学悉尼大学物理学院

自2010年12月起,坐落在正负电子对撞机VEPP-2000上的CMD-3探测器成功取数.2013年首次在对撞能量小于1GeV能区进行扫描,并获取积分亮度为18pb-1的数据.本文给出了e^+e^-→π^+π^-截面的初步结果.

关键词： π介子形状因子正负电子对撞机强子截面

Were Late Cretaceous extinctions of gastropods selective by generic longevity?

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Geoscience Frontiers 2013年第1期4卷 87-93页

作者： Dmitry A.ruban Division of Mineralogy and Petrography Geology and Geography FacultySouthern Federal University

Many gastropod ta.a.went extinct during the Late Cretaceous. The stratigraphic ranges of 268 genera permit to establish the longevity of extinction victims for each stage of this epoch. ＂Young＂ ta.a.（originated within B epochs before the extinction） prevailed among victims of the extinctions in all stages. The proportion of ＂old＂ ta.a.（originated before the Cretaceous） that went extinct was the highest in the Cenomanian, and it was the lowest in the Coniacian and the Maastrichtian. It appears that the end-Cretaceous mass extinction affected chiefly ＂young＂ ta.a. However, the comparison with the earlier time intervals suggests that this pattern of selectivity by generic longevity was not specific for the noted ca.a.trophe, but, in contrast, it was typical for the entire Late Cretaceous. The latest Cenomanian environmental perturbation （OAE2） caused a stronger extinction of＂old＂ ta.a. and thus, this biotic crisis was less selective by generic longevity. This hypothesis, however, is not proven by the statistical test.

关键词： Gastropods Extinction Longevity Selectivity Late Cretaceous

Mesozoic long-term eustatic cycles and their uncertain hierarchy

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Geoscience Frontiers 2015年第4期6卷 503-511页

作者： Dmitry A.ruban Department of Tourism Higher School of Business Southern Federal University International Agency for Minerals Policy ("MinPol")

Global sea-level has changed in a cyclic manner through geologic history, but the regularities of these changes are yet to be fully understood. Despite certain （and sometimes significant） differences, the a.a.lable Mesozoic eustatic curves permit the outlining of long-term eustatic cycles, which are provi- sionally defined as cycles recognizable at the stage level and higher. Interpretation of the Triassic eustatic curves indicates two orders of long-term cycles and a lst-order sea-level rise throughout the entire period. The Jurassic eustatic curves imply cyclicity of one or two orders, and a 1st-order eustatic rise during the entire period is also evident. Most challenges are interpretations for the Cretaceous; two to four orders of long-term eustatic cycles can be established for this period. Generally, the hierarchy of the long-term eustatic cycles might have changed through the Mesozoic. If so, and if one considers differences of cycles of the same order between the periods of this era, it is difficult to apply ＂standard＂ hierarchical classifications to the documented cycles. The hypothetical uncertainty of the hierarchy of the Mesozoic long-term eustatic cycles is an imoortant challenge for modern researchers.

关键词： Global sea-leve Eustatic cycle Triassic Jurassic Cretaceous

VEPP-2000 e^+e^-对撞机上用CMD-3谱仪研究1004-1060 MeV能区的e^+e^-→K■过程（英文）

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中国科学技术大学学报 2016年第6期46卷 507-513页

作者： KOZYREV E.A. AMIRKHANOV A.N. ANISENKOV A.V. M.AULCHENKO V. BANZAROV V.S. BASHTOVOY N.S. BERKAEV D.E. BONDAR A.E. BRAGIN A.V. EIDELMAN S.I. A.EPIFANOV D. EPSHTEYN L.B. EROFEEV A.L. FEDOTOVICH G.V. Ga.a.OV S.E. GREBENUK a.a. GRIBANOV S.S. GRIGORIEV D.N. IGNATOV F.V. IVANOV V.L. KARPOV S.V. Ka.a.V A.S. Ka.a.IN V.F. IRPOTIN A.N. KOROBOV a.a. KOVALENKO O.A. KOZYREV A.N. KOOP I.A. KROKOVNY P.P. KUZMENKO A.E. KUZMIN A.S. LOGASHENKO I.B. LUKIN P.A. MIKHAILOV K.YU. OKHAPKIN V.S. OTBOEV A.V. PESTOVY U.N POPOV A.S. RAZUVAEV G.P. ruban a.a. RYSKULOV N.M. RYZHENENKOV A.E. SENCHENKO A.I. SHEBALIN V.E. SHEMYAKIN V.E. SHWARTZ A.S. SHWARTZ D.B. SIBIDANOV A.L. SHATUNOV P.YU. SHATUNOVY U.M. SOLODOV E.P. TITOV V.M. TALYSHEV a.a. VOROBIOV A.I. YUDINY U.V. 俄罗斯布德克尔核物理研究所国立新西伯利亚大学国立新西伯利亚理工大学悉尼大学物理学院高能物理系

在质心能量1004-1060Me V之间的25个能量点测量了e^+e^-→K_S^0+K_L^0和e^+e^-→KK截面,系统误差大约为2%-3%.分析是基于VEPP-2000e^+e^-对撞机上CMD-3收集的积分亮度为5.5 pb-1的实验数据.测量的截面可近似看作Ф,ω,ρ类似的振幅及其... 详细信息

在质心能量1004-1060Me V之间的25个能量点测量了e^+e^-→K_S^0+K_L^0和e^+e^-→KK截面,系统误差大约为2%-3%.分析是基于VEPP-2000e^+e^-对撞机上CMD-3收集的积分亮度为5.5 pb-1的实验数据.测量的截面可近似看作Ф,ω,ρ类似的振幅及其激发态按照矢量介子主导模型的叠加,得到了Ф(1020)介子的共振参数.

关键词：强子正负电子对撞机介子形状因子

Episodic events in long-term geological processes:A new classification and its applications

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Geoscience Frontiers 2018年第2期9卷 377-389页

作者： Dmitry A.ruban Southern Federal University 23-ja linija Street 43Rostov-na-Donu344019Russia

Long-term geological processes are usually described with curves reflecting continuous changes in the cha.a.teristic pa.a.eters through the geological history, and such curves can be employed directly for recognition of episodic(relatively long-term) events linked to these changes. The episodic events can be classified into several categories according to their scale(ordinary and anomalous events), "shape"(positive, negative, and neutral events), and relation to long-term trend change(successive, interruptive,facilitative, stabilizing, transformative, increasing, and decreasing). Many types of these events can be defined depending on the combination of the above-mentioned patterns. Of course, spatial rank,duration, and origin can be also considered in description of these events. The proposed classification can be applied to events in some real long-term geological processes, which include global sea-level changes,biodiversity dynamics, lithospheric plate number changes, and pa.a.oclimate changes. Several case examples prove the usefulness of the classification. It is established that the Early Va.a.ginian(Early Cretaceous) eustatic lowstand(the lowest position of the sea level in the entire Cretaceous) was negative,but ordinary and only interruptive event. In the other case, it becomes clear that the only end-Ordovician and the Permian/Triassic mass extinctions transformed the trends of the biodiversity dynamics(from increase to decrease and from decrease to increase respectively), and the only Cretaceous/Paleogene mass extinction was really anomalous event on the Phanerozoic biodiversity curve. The new pa.a.ontological da.a.are employed to reconstruct the diversity dynamics of brachiopods in Germany(without the Alps) and the Swiss Jura Mountains. The further interpretation of the both diversity curves implies that the Early Toarcian mass extinction affected the regional brachiopod faunas strongly, but this event was only decreasing(biotic radiation continued after

关键词： Biodiversity dynamics Early Triassic warming Geological classification Plate tectonics Toarcian

Investigation of magnetic, optical and electrical properties of La_3Ba_3Cu_6O_(14) synthesized by molten flux method

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Journal of Rare Earths 2015年第12期33卷 1341-1347页

作者： K.Agilandeswari A.ruban Kumar Department of Chemistry Auxilium College School of Advanced Sciences VIT University

The great deal of novel rare earth based semiconducting lanthanum barium copper oxide La3Ba3Cu6OI4 （LBC-336） were synthesized by low temperature molten salt synthesis （MSS） due to ＂dissolution precipitation mechanism＂. Here, we reported one pot synthesis of product by direct precipitation from a molten KOH-NaOH mixnare at 450 ℃ and single phase La3Ba3Cu6014 with tetragonal crystal system. The particle size of 140-200 nm were observed in both PXRD pattern and HRSEM micrographs and it showed a cubic morphology. The semiconducting nature was extracted from various pa.a.eters like optical band gap （1.8 eV）, AC conductivity （0.70 eV）, DC conductivity （0.70 eV）, and also Hall effect pa.a.eters like the charge carrier concentration values n=6,0x 1026 m-3 and it proved as a p-type semiconductor. The electrical phase trasition temperature from ferroelectric to antiferroelec- tric system （Tin=420 K） and anti-ferroelectric - pa.a.lectric system （depolarization temperature Ta=673 K） which attributed to the space charge polarization contributed to the conduction mechanism. The magnetic phase transitions were from ferromagnetic to ferrimagnetic system （Curie temperature （Tc=70 K）） and it led to soft magnetic material and also held good for superconductor appli- cation upto 70 K.

关键词： molten flux synthesis band gap phase transitions semiconductor superconductors rare earths