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- 저자 : Upmanyu, Moneesh (검색결과 4 건)
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Influence of sitting time on pulmonary function in computer-using office workers
Aditi Upmanyu,Amit Kumar,Varun Kalia 한국운동영양학회 2024 Physical Activity and Nutrition (Phys Act Nutr) Vol.28 No.1
[Purpose] We aimed to identify the changes in pulmonary function after prolonged sitting. Pulmonary function tests (PFTs) allow physicians to assess the respiratory capability of patients under numerous clinical circumstances and when there are risk factors for lung sickness, occupational exposure, and pulmonary toxicity. PFTs are routinely performed in the standing or high sitting position because of the devices and patient comfort. [Methods] A total of 180 asymptomatic office workers were recruited as eligibility criteria and divided into three groups according to their daily sitting duration (group 1:2–4 h, group 2:4–6 h, and group 3: > 6 h). PFTs were performed twice consecutively to determine the mean of the readings. A Helios 401 spirometer was used to quantify lung function. The parameters were “forced expiratory volume in 1 s (FEV1)”, “forced vital capacity (FVC)”, “peak expiratory flow rate (PEFR)”, and the “ratio of FEV1 to FVC (FEV1/FVC)”. [Results] Our results suggest that noteworthy changes were present in the lung function of all the participants. For individuals with > 6 h of sitting; FVC, FEV1, and PEFR were higher compared to those of the participants with 2–4 h and 4–6 h of sitting. The FEV1/FVC ratio was also reduced in individuals with prolonged hours of sitting. [Conclusion] Body position impacts the result of PFTs; however, that as it may, the ideal position and extent of advantage changed between the review populaces. These results suggested that noteworthy changes occur in the lung function of healthy individuals exposed to sitting time.
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Ultrathin SWNT Films with Tunable, Anisotropic Transport Properties
Li, Bo,Jung, Hyun Young,Wang, Hailong,Kim, Young Lae,Kim, Taehoon,Hahm, Myung Gwan,Busnaina, Ahmed,Upmanyu, Moneesh,Jung, Yung Joon WILEY‐VCH Verlag 2011 Advanced functional materials Vol.21 No.10
<P><B>Abstract</B></P><P>Directional transport properties at the nanoscale remain a challenge, primarily due to issues pertaining to control over the underlying anisotropy and scalability to macroscopic scales. Here, we develop a facile approach based on template‐guided fluidic assembly of high mobility building blocks – single walled carbon nanotubes (SWNTs) – to fabricate ultrathin and anisotropic SWNTs films. A major advancement is the complete control over the anisotropy in the assembled nanostructure, realized by three‐dimensional engineering of the dip‐coated SWNTs ultrathin film into alternating hydrophilic and hydrophobic microline patterns with prescribed intra/inter‐line widths and line thicknesses. Variations in the contact line profile results in an evaporation‐controlled assembly mechanism that leads to alternating, and more importantly, contiguous SWNTs networks. Evidently, the nanoscopic thickness modulations are direct reflections of the substrate geometry and chemistry. The nanostructured film exhibits significant anisotropy in electrical and thermal transport properties as well as an optically transparent nature, as revealed by characterization studies. The direct interplay between the anisotropy and the 3D microline patterns of the substrate combined with the wafer‐level scalability of the fluidic assembly allows us to tune the transport properties for a host of nanoelectronic applications.</P>
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Hahm, Myung Gwan,Wang, Hailong,Jung, Hyun Young,Hong, Sanghyun,Lee, Sung-Goo,Kim, Sung-Ryong,Upmanyu, Moneesh,Jung, Yung Joon RSC Pub 2012 Nanoscale Vol.4 No.11
<P>High-density carbon nanotube networks (CNNs) continue to attract interest as active elements in nanoelectronic devices, nanoelectromechanical systems (NEMS) and multifunctional nanocomposites. The interplay between the network nanostructure and its properties is crucial, yet current understanding remains limited to the passive response. Here, we employ a novel superstructure consisting of millimeter-long vertically aligned single walled carbon nanotubes (SWCNTs) sandwiched between polydimethylsiloxane (PDMS) layers to quantify the effect of two classes of mechanical stimuli, film densification and stretching, on the electronic and thermal transport across the network. The network deforms easily with an increase in the electrical and thermal conductivities, suggestive of a floppy yet highly reconfigurable network. Insight from atomistically informed coarse-grained simulations uncover an interplay between the extent of lateral assembly of the bundles, modulated by surface zipping/unzipping, and the elastic energy associated with the bent conformations of the nanotubes/bundles. During densification, the network becomes highly interconnected yet we observe a modest increase in bundling primarily due to the reduced spacing between the SWCNTs. The stretching, on the other hand, is characterized by an initial debundling regime as the strain accommodation occurs via unzipping of the branched interconnects, followed by rapid rebundling as the strain transfers to the increasingly aligned bundles. In both cases, the increase in the electrical and thermal conductivity is primarily due to the increase in bundle size; the changes in network connectivity have a minor effect on the transport. Our results have broad implications for filamentous networks of inorganic nanoassemblies composed of interacting tubes, wires and ribbons/belts.</P>
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Topological Transitions in Carbon Nanotube Networks <i>via</i> Nanoscale Confinement
Somu, Sivasubramanian,Wang, Hailong,Kim, Younglae,Jaberansari, Laila,Hahm, Myung Gwan,Li, Bo,Kim, Taehoon,Xiong, Xugang,Jung, Yung Joon,Upmanyu, Moneesh,Busnaina, Ahmed American Chemical Society 2010 ACS NANO Vol.4 No.7
<P>Efforts aimed at large-scale integration of nanoelectronic devices that exploit the superior electronic and mechanical properties of single-walled carbon nanotubes (SWCNTs) remain limited by the difficulties associated with manipulation and packaging of individual SWNTs. Alternative approaches based on ultrathin carbon nanotube networks (CNNs) have enjoyed success of late with the realization of several scalable device applications. However, precise control over the network electronic transport is challenging due to (i) an often uncontrollable interplay between network coverage and its detailed topology and (ii) the inherent electrical heterogeneity of the constituent SWNTs. In this article, we use template-assisted fluidic assembly of SWCNT networks to explore the effect of geometric confinement on the network topology. Heterogeneous SWCNT networks dip-coated onto submicrometer wide ultrathin polymer channels become increasingly aligned with decreasing channel width and thickness. Experimental-scale coarse-grained computations of interacting SWCNTs show that the effect is a reflection of a topology that is no longer dependent on the network density, which in turn emerges as a robust knob that can induce semiconductor-to-metallic transitions in the network response. Our study demonstrates the effectiveness of directed assembly on channels with varying degrees of confinement as a simple tool to tailor the conductance of the otherwise heterogeneous network, opening up the possibility of robust large-scale CNN-based devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-7/nn100714v/production/images/medium/nn-2010-00714v_0003.gif'></P>
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