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排序方式: 共有95条查询结果,搜索用时 125 毫秒
1.
Mit Rita Goswami Prayas Singh Pankaj Chamoli Sumit Bhardwaj Kuldeep Kumar Raina Ravi Kumar Shukla 《应用聚合物科学杂志》2021,138(43):51260
ZnO rice like nonarchitects are grafted on the graphene carbon core via a rapid microwave synthesis route. The prepared grafted systems are characterized via XRD, SEM, RAMAN, and XPS to examined the structural and morphological parameters. Zinc oxide grafted graphene sheets (ZnO-G) are further doped in β-phase of polyvinylidene fluoride (PVDF) to prepare the polymer nanocomposites (PNCs) via mixed solvent approach (THF/DMF). β-phase confirmation of PVDF PNCs is done by FTIR studies. It is observed that ZnO-G filler enhances the β-phase content in the PNCs. Non-doped PVDF and PNCs are further studied for rheological behavior under the shear rate of 1–100 s−1. Doping of ZnO-G dopant to the PVDF matrix changes its discontinuous shear thickening (DST) behavior to continues shear thickening behavior (CST). Hydrocluster formation and their interaction with the dopant could be the reason for this striking DST to CST behavioral change. Strain amplitude sweep (10−3% -10%) oscillatory test reveals that the PNCs shows extended linear viscoelastic region with high elastic modulus and lower viscous modulus. Effective shear thickening behavior and strong elastic strength of these PNCs present their candidature for various fields including mechanical and soft body armor applications. 相似文献
2.
Arti Gupta R. P. Tandon 《Journal of Materials Science: Materials in Electronics》2014,25(9):4074-4077
In this paper we report the dielectric and magnetoelectric (ME) properties of co-fired Pb0.52Ti0.48O3–Co0.6Zn0.4Mn0.3Fe1.7O4–PbZr0.52Ti0.48O3 (PZT–CZFMO–PZT) trilayer composites prepared using Mn and Zn simultaneously substituted CoFe2O4 (Co0.6Zn0.4Mn0.3Fe1.7O4) as a magnetostrictive phase. For PZT–CZFMO–PZT composites, the maximum values of longitudinal and transverse ME voltage coefficient (α E33 and α E31 ) were observed to be comparable in magnitude contrary to the usual trend (α E31 much greater than α E33 ) for ME composite structures. The highest transverse ME voltage coefficient α E31 ~64 mV/cm Oe (at an applied ac magnetic field of frequency ~1 kHz) was obtained for the composite containing the thickest layer of CZFMO. The dielectric constant spectra for PZT–CZFMO–PZT composites demonstrated very high values of resonance frequency (~47–81 MHz) and band width (~9–13 MHz). 相似文献
3.
A substantial improvement in the thermal performance of solar air heater is found by using roughness on the underside of the absorber plate. In the present investigation, the effect of relative roughness height of roughness element on the thermohydraulic performance of solar air heaters is carried out. The range of roughness and flow parameters for the investigation are relative roughness height (e/H): 0.285–0.6, relative roughness pitch (P/e): 2, angle of attack (α): 60°, open area ratio (β): 12% and Reynolds number (Re): 3800–19,000. The relative roughness height of 0.285 is thermohydraulically better in comparison to other relative roughness heights. The results show that the V down perforated baffles is thermohydraulically better than the solid baffles. 相似文献
4.
5.
Giovanni Pioggia Roberta Igliozzi Marcello Ferro Arti Ahluwalia Filippo Muratori Danilo De Rossi 《IEEE transactions on neural systems and rehabilitation engineering》2005,13(4):507-515
It is well documented that the processing of social and emotional information is impaired in people with autism. Recent studies have shown that individuals, particularly those with high functioning autism, can learn to cope with common social situations if they are made to enact possible scenarios they may encounter in real life during therapy. The main aim of this work is to describe an interactive life-like facial display (FACE) and a supporting therapeutic protocol that will enable us to verify if the system can help children with autism to learn, identify, interpret, and use emotional information and extend these skills in a socially appropriate, flexible, and adaptive context. The therapeutic setup consists of a specially equipped room in which the subject, under the supervision of a therapist, can interact with FACE. The android display and associated control system has automatic facial tracking, expression recognition, and eye tracking. The treatment scheme is based on a series of therapist-guided sessions in which a patient communicates with FACE through an interactive console. Preliminary data regarding the exposure to FACE of two children are reported. 相似文献
6.
Alberto Mazzoldi Mario Tesconi Alessandro Tognetti Walter Rocchia Giovanni Vozzi Giovanni Pioggia Arti Ahluwalia Danilo De Rossi 《Materials science & engineering. C, Materials for biological applications》2008,28(7):1057-1064
Carbon nanotube (NT) actuators were fabricated using the micromolding method. In order to prevent the nanotubes from aggregating, they were enclosed in a partially cross-linked polyvinylalcohol–polyallylamine matrix. A unimorph matrix bender in the form of a small multi-layered strip, 5 mm × 15 mm was fabricated. The resulting composite system: NT/PVA, solid polymer electrolyte and metal contact, was characterised using impedance analysis and cyclic voltammetry. Initial measurements on electro-mechanical transduction show a conversion efficiency of 0.2 μm/mV. An electrochemical model of the impedance of the system was then developed, with which the experimental results agree fairly well. 相似文献
7.
Manav R. Bhatnagar M. K. Arti Are Hjørungnes Ranjan Bose Lingyang Song 《Wireless Personal Communications》2010,54(1):69-81
In this paper, we propose high-rate space–time coding for cooperative wireless networks to reduce the overall delay incurred
in relaying signals to multiple receivers. The relay structure is optimized in order to achieve maximum SNR at the receiver
nodes. The proposed scheme provides a significant reduction in the delay required for the relaying and transmission of the
signals to the multiple receivers with a minute loss in performance. We have also shown by simulation that this loss in the
performance could be recovered by selecting more number of relays. We propose two relaying strategies for high-rate space–time
codes, which are very useful in providing high data-rate in wireless cooperative networks. 相似文献
8.
This article applies recently developed panel unit root and panel cointegration techniques to estimate the long-run and short-run income and price elasticities for residential demand for electricity in G7 countries. The panel results indicate that in the long-run residential demand for electricity is price elastic and income inelastic. The study concludes that from an environmental perspective there is potential to use pricing policies in the G7 countries to curtail residential electricity demand, and thus curb carbon emissions, in the long run. 相似文献
9.
10.
Polysaccharide based graft copolymer (xanthan gum‐g‐4‐vinyl pyridine) was synthesized using potassium peroxymonosulphate/ascorbic acid redox initiator in inert atmosphere at 40°C. By studying the effect of the concentration of monomer, peroxymonosulphate (PMS), ascorbic acid (AA), xanthan gum (XOH), hydrogen ion along with effect of time and temperature on grafting characteristics: grafting ratio (%G), add on (%A), conversion (%C), efficiency (%E), homopolymer (%H), and rate of grafting (Rg), the reaction conditions for optimum grafting were determined. The optimum concentration of AA, H+ ion, 4‐VP for maximum grafting were found to be 10.0 × 10?3 mol dm?3, 2.5 × 10?2 mol dm?3, 10.0 × 10?3 mol dm?3, respectively. Maximum %G was obtained at minimum concentration of xanthan gum i.e., at 40.0 × 10?2 g dm?3 and at maximum concentration of PMS i.e., at 10.0 × 10?3 mol dm?3. The optimum temperature and time duration of reaction for maximum % of grafting were found to be 45°C and 120 min respectively. The synthesized graft copolymer was characterized by FTIR analysis. Thermogravimetric analysis showed that the xanthan gum‐g‐4‐vinyl pyridine is thermally more stable than pure gum. A probable mechanism was suggested for the graft copolymerization. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献