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排序方式: 共有143条查询结果,搜索用时 46 毫秒
1.
Vidya Kishore Christine Ajinjeru Ahmed A. Hassen John Lindahl Vlastimil Kunc Chad Duty 《Polymer Engineering and Science》2020,60(5):1066-1075
To develop new materials for extrusion additive manufacturing (AM) systems, a fundamental understanding of rheological properties is essential to correlate the effect of processing on material structure and its properties. In this work, the rheological properties of five different grades of neat and carbon fiber (CF)-reinforced poly(ether ketone ketone) are reported. Rheological properties are essential to understand the effect of reinforcing fibers and AM process parameters such as time, temperature, environment, and shear rate on flow behavior during processing. Small-amplitude oscillatory shear tests and steady shear tests indicated neat grades to exhibit less increase in viscosity over time when processed in air than the CF-filled grades. The filled grades showed greater shear thinning and lower sensitivity to temperature. Overall, this rheological analysis provides a broad framework for determining appropriate processing conditions for extrusion deposition AM of such high-temperature polymer systems. 相似文献
2.
Analysis of fly ash heavy metal content and disposal in three thermal power plants in India 总被引:2,自引:0,他引:2
The study investigates the heavy metal content of fly ash and bottom ash from three major power plants in North India, using flame atomic absorption spectrometry. It also studies the prevalent disposal methods used at these sites. The ashes were analysed for the presence of Cr, Mn, Pb, Zn, Cu, Ni and Co and detectable levels of all were found in both fly ash and bottom ash. The concentrations of Cr and Zn were highest while Co concentration was less. The wet disposal method is used in two of the power plants (site 1 and site 3). Neither of the sites uses ash pond lining in the construction of the ash ponds, hence leaching of the heavy metals is possible. Site 2 has adopted 100% dry disposal system which allows better utilization but incurs additional costs. Better management practices, increased utilization and proper disposal practices need to be undertaken to minimize the adverse environmental impact. 相似文献
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4.
Kodgirwar Vidya P. Deosarkar Shankar B. Joshi Kalyani R. 《Wireless Personal Communications》2020,110(1):423-444
Wireless Personal Communications - Applications of wireless sensor networks (WSNs) are increasing tremendously to facilitate and establish a link between the physical world and information system.... 相似文献
5.
6.
R. Vidya Sagar B. K. Raghu Prasad B. L. Karihaloo 《International Journal of Fracture》2010,161(2):121-129
Notched three-point bend specimens (TPB) were tested under crack mouth opening displacement (CMOD) control at a rate of 0.0004 mm/s
and the entire fracture process was simulated using a regular triangular two-dimensional lattice network only over the expected
fracture process zone width. The rest of the beam specimen was discretised by a coarse triangular finite element mesh. The
discrete grain structure of the concrete was generated assuming the grains to be spherical. The load versus CMOD plots thus
simulated agreed reasonably well with the experimental results. Moreover, acoustic emission (AE) hits were recorded during
the test and compared with the number of fractured lattice elements. It was found that the cumulative AE hits correlated well
with the cumulative fractured lattice elements at all load levels thus providing a useful means for predicting when the micro-cracks
form during the fracturing process, both in the pre-peak and in the post-peak regimes. 相似文献
7.
Julie Chandra C. S. Bipinbal P. K. Dileep P. Sasi Sreesha Raman Vidya Bindu Sharmila T. K. Narayanankutty Sunil K. 《SILICON》2022,14(13):7919-7932
Silicon - Nanosilica was synthesized from a low cost raw material, olivine by a more sustainable and cost effective method. The pure nanosilica obtained was amorphous in nature with a surface area... 相似文献
8.
A novel nanoscale zerovalent iron-Sargassum swartzii (nZVI-SS) biocomposite was tested for its ability to remove malachite green from aqueous solutions. Batch equilibrium tests at different pH conditions showed that at pH 10, a maximum removal of 142.85 mg/g was observed according to Langmuir model. Involvement of various functional groups of the biosorbent in preferential biosorption of cationic dye was observed using Fourier transform infrared spectroscopy. Morphological changes occurring on the biocomposite materials were characterized using scanning electron microscopy. Furthermore, temperature and kinetic profiles during the biosorption process were also reported. 相似文献
9.
Hemangi G. Chidley Ram S. Kulkarni Keshav H. Pujari Ashok P. Giri Vidya S. Gupta 《Food chemistry》2013
Alphonso is a highly favoured and exported mango cultivar among the vast mango germplasm of India. Being a climacteric fruit, ethylene plays an important role in ripening of mango. For deeper understanding of effect of pre-climacteric ethylene treatment on volatile profiles of Alphonso mango, 26 volatiles were tracked through six ripening stages of pulp and skin of ethylene-treated and control Alphonso fruits. The study revealed accelerated ripening in terms of early appearance of ripening-specific compounds, lactones and mesifuran, upon ethylene treatment. While the level of lactones remained unaffected, the mesifuran level vastly increased upon ethylene treatment. Skin showed high terpene content while pulp had higher amount of lactones compared to skin. This work points towards involvement of ethylene as a natural hormone in the biosynthesis of lactones and furanones in naturally ripened fruits; whereas, an increase in the terpene level during ripening appears to be independent of ethylene. 相似文献
10.
S. Vidya Sam Solomon J. K. Thomas 《Journal of Materials Science: Materials in Electronics》2014,25(2):693-701
Nanocrystalline strontium tungstate (SrWO4) is synthesized through a single step modified combustion process. The X-ray diffraction, Fourier transform Raman and Infrared spectroscopy studies reveal that the as-prepared powder is single phase and possess tetragonal structure. The transmission electron microscopic investigations have shown that the particle size of the as prepared powder is in the range 18–22 nm. The optical constants are estimated from the UV–Visible studies and calculated optical band gap is 4.28 eV. The sample showed maximum transmission in the visible regions but poor transmittance in the ultraviolet region. The photoluminescence spectra recorded at different temperatures showed intense blue emission. The nanocrystalline SrWO4 obtained by the present combustion method was sintered to 95 % density at a relatively lower temperature of 810 °C for 3 h. The dielectric constant (εr) and loss factor (tan δ) of the sintered SrWO4 pellets at 5 MHz measured at room temperature were 9.9 and 6.29 × 10?3 respectively. The experimental results obtained in this work demonstrate the application of SrWO4 as UV filters, transparent films for window layers on solar cells, anti-reflection coatings, scintillators, detectors and for low-temperature co-fired ceramic applications. 相似文献