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Acoustical properties of a 3D printed honeycomb structure filled with nanofillers:Experimental analysis 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 Subramanian Vinoth kumar Selvaraj 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 analysed 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 parallel ***,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

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A framework for the sustainability implications of 3D bioprinting through nature-inspired materials and structures

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Bio-Design and Manufacturing 2022年第2期5卷 412-423页

作者： ruban whenish Seeram Ramakrishna Amit Kumar Jaiswal Geetha Manivasagam Center for Biomaterials Cellular and Molecular TheranosticsVellore Institute of TechnologyVelloreTamilnadu 632014India Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1119260Singapore

Introduction The climax of the industrial revolution was marked by the rapid growth of industry,and advancement in technologies have further fueled this industrial expansion,leading to a surge in economic *** technolo... 详细信息

关键词： printing advancement revolution

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Acoustical properties of a 3D printed honeycomb structure fi lled with nanofi llers: Experimental analysis and optimization for emerging applications

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Defence technology 2024年第5期 248页

作者： Jeyanthi Subramanian Vinoth kumar Selvaraj Rohan Singh Ilangovan S Naresh Kakur ruban whenish

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Unveiling the atomic-scale transition between light harvesting and photoprotective states in plant photosynthesis

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Science China Chemistry 2024年第5期67卷 1375-1377页

作者： Alexander V.ruban School of Biological and Behavioural Sciences Queen Mary University of LondonLondon E14NSUK

Non-photochemical chlorophyll fluorescence quenching(NPQ) stands as a cornerstone in the realm of photosynthesis research, attracting generations of dedicated scientists in their quest to unravel its mysteries. This mechanism, crucial for safeguarding photosynthesis, plays a pivotal role in regulating light harvesting, particularly in oxygenic photosynthesis where the oxygen-evolving photosystem II (PSII)is susceptible to photodamage [1].

关键词： harvesting protective attracting

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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 available 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

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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 taxa 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＂ taxa （originated within B epochs before the extinction） prevailed among victims of the extinctions in all stages. The proportion of ＂old＂ taxa （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＂ taxa. However, the comparison with the earlier time intervals suggests that this pattern of selectivity by generic longevity was not specific for the noted catastrophe, but, in contrast, it was typical for the entire Late Cretaceous. The latest Cenomanian environmental perturbation （OAE2） caused a stronger extinction of＂old＂ taxa, 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

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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 characteristic parameters 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 palaeoclimate changes. Several case examples prove the usefulness of the classification. It is established that the Early Valanginian(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 palaeontological data 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

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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 parameters like optical band gap （1.8 eV）, AC conductivity （0.70 eV）, DC conductivity （0.70 eV）, and also Hall effect parameters 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 - paraelectric 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

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Highly reactive chemicals meet haploidization

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Molecular Plant 2022年第6期15卷 937-939页

作者： Alevtina ruban Andreas Houben KWS SAAT SE&Co.KGaA Grimsehlstraße 3137574 EinbeckGermany Leibniz Institute of Plant Genetics and Crop Plant Research(IPK)Gatersleben Corrensstraße 306466 Stadt SeelandGermany

The ability to generate(di)haploid plants has provided a strategy to significantly accelerate the crop-breeding *** major advantage of doubled haploids to breeders lies in the simultaneous genetic fixation at every locus within a single generational ***,each doubled haploid(DH)represents a pure line that can be further evaluated for the range of agronomically important *** have been induced mainly through the generation of plants from cultivated gametophytic(haploid)cells,i.e.,in vitro haploid technologies,or through the selective loss of one parental chromosome set upon inter-or intraspecific hybridization,i.e.,in vivo haploid ***,in many crop species,efficient haploid technology is not yet available or only applicable to a limited number of genotypes(reviewed by Jacquier et al.,2020).Due to the limits and costs of current haploid technologies,plant breeders are highly interested in any methodological *** efficient DH production system with low genotype dependency based on the in vivo approach exists so far only in *** haploid-inducing capacity of the inbred line Stock6,originally reported to cause haploid induction rates of 2.3%–3.2%(Coe,1959),was further increased to above 8%in various inducer breeding programs(reviewed by Jacquier et al.,2020).The underlying genetics of the in vivo haploid induction process is quite ***,in recent years significant advances have been made in elucidating the major players.

关键词： breeding doubled Highly

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In vitro antibacterial activity of Hibiscus rosa-sinensis flower extract against human pathogens

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Asian Pacific Journal of Tropical Biomedicine 2012年第5期2卷 399-403页

作者： ruban P Gajalakshmi K School of Marine Sciences Department of Oceanography and Coastal Area StudiesAlagappa University Department of Plant Biology and Plant Biotechnology PSGR Krishnammal College for Women

Objective:To access the in vitro antibacterial activity of Hibiscus rosa-sinensis(***-sinensis) flower extract against human ***:Antibacterial activity was evaluated by using disc and agar diffusion *** protein was run through poly acrylmide gel electrophoresis to view their protein ***:The results showed that the cold extraction illustrates a maximum zone of inhibition against Bacillus suhtillis(***),Escherichia coli(***) viz.,(17.00±2.91),(14.50±1.71)*** by hot extraction *** ***(11.66 ±3.14),(10.60±3.09)*** methanol extraction showed a highest zone of inhibition recorded against ***,*** as(18.86±0.18),(18.00±1.63) mm pursued by ethanol extraction shower) utmost zone of inhibition recorded against Salmonella ***(20.40±1.54) *** crude protein from flower showed a maximum inhibitory zone observed against Salmonella sp.,*** viz.,(16.55±1.16),(14.30±2.86)*** flower material can be taken as an alternative source of antibacterial agent against the human ***:The extracts of the *** art;proved to have potential antibacterial activity,further studies arc highly need for the drug development.

关键词： in-vitro Antibacterial activity Hibiscus rosa-sinensis Protein Human pathogen

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