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21.
Nanoparticle suspensions (nanofluids) have been recommended as a promising option for various engineering applications, due to the observed enhancement of thermophysical properties and improvement in the effectiveness of thermal phenomena. A number of investigations have been reported in the recent past, in order to quantify the thermo-fluidic behavior of nanofluids. This review is focused on examining and comparing the measurements of convective heat transfer and phase change in nanofluids, with an emphasis on the experimental techniques employed to measure the effective thermal conductivity, as well as to characterize the thermal performance of systems involving nanofluids. 相似文献
22.
Bidyapati Mishra Pradipta Kumar Jena B. Hazarika K. Siva Kumar T. Balakrishna Bhat 《Materials & Design》2010
Armour steel plates with drilled holes are filled with explosive and subjected to single or multiple blasts to induce shattering. The critical diameter for shattering under explosive detonation, found from the experiments matches closely with that of the long rod penetrator impacted plates. The damage pattern and fracture surface of the tested samples under blast effect have been compared with plates impacted with long rod penetrators for matching the observed shattering behavior. Difference in the shattering behavior of the armour steel subjected to single and multiple blasts has also been presented. 相似文献
23.
P.K. Jena N. JagtapK. Siva Kumar T. Balakrishna Bhat 《International Journal of Impact Engineering》2010
This investigation describes and analyses the experimental results pertinent to the penetration of Al-7017 plates with non-deformable steel projectiles at a velocity of 840 ± 15 m/s at different angles of impact. The results include the variation in damage pattern, damage area at front and back, mid penetration channel observations, residual velocity and energy absorption capacities at different obliquities. Some observations relating to the adiabatic shear bands formation have also been presented. The micro hardness values along the path of penetration have been studied in order to understand the increase in energy absorption at oblique impact. The experimental data shows a transition of failure mode from an adiabatic shear band induced shear plugging at lower obliquities to a more homogeneous deformation of the target material and gouging at higher obliquities. 相似文献
24.
T. M. Subrahmanya Nagaraj S. Naik Mahesh Padaki R. Geetha Balakrishna M. S. Jyothi Sudesh Yadav Wei-Song Hung 《应用聚合物科学杂志》2019,136(48):48254
A novel polymer poly(4,4′-biphenylene sulfonyl succinamide) (PBSS) was synthesized via polycondensation reaction. Succinyl chloride and 4-aminophenyl sulfone were used as reactive monomers and anhydrous AlCl3 was used as a catalyst. Both polysulfone (PSf) and PBSS were dissolved in N-methyl-2-pyrrolidone (NMP) at different compositions to obtain a homogeneous solution to fabricate PSf-PBSS blend membranes. The structure of PBSS was characterized by ATR-IR and 1H-NMR spectroscopy. Thermal properties of PBSS were analyzed by TGA-DTA. Mechanical properties and morphology of blend membranes were analyzed by universal testing machines and field emission scanning electron microscope, respectively. The hydrophilicity of blend membranes with respect to the concentration of PBSS was studied by contact angle and water uptake studies. Upon blending, the hydrophilicity of PSf-PBSS membranes drastically increased due to the presence of large number of amide and sulfonyl groups in the matrix. The blend membranes exhibited significant increase in water flux from 100 L m−2 h to 650 L m−2 h−1, and rejection of 100% for Pb(II) and 80% for both Cd(II) and As(III) toxic heavy metal ions. The hydrophilic nature of CO NH and inter and intramolecular hydrogen bonding among PBSS polymer chains dispersed within rigid PSf matrix imparts softness, amide and sulfonyl groups enhance interconnected porosity and hydrophilicity of blend membranes. Hence, PBSS may serve as a low-cost novel polymeric additive for water purification and separation membrane applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48254. 相似文献
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The densification process during pressure sintering has been analyzed using finite element analysis. This analysis uses an
iterative solution algorithm. With this the densification process in complex geometries with complex boundary conditions can
be analyzed and this technique is particularly suited for tackling material nonlinearity. Evolution of dense structures with
gradual closure of pores is described for two typical geometries. 相似文献
28.
Karathan Parakkandi Priyanka Variampally Sankar Harikumar Kagalagodu Manjunthiah Balakrishna Thomas Varghese 《IET nanobiotechnology / IET》2017,11(1):66
While nanoparticles (NPs) are known to exhibit antimicrobial properties, their effects on symbiotic arbuscular mycorrhizal fungi (AMF) in plant roots has to be carefully examined as NPs particularly of titanium dioxide (TiO2) reach plant roots through varied sources such as fertilisers, plant protection products and other nanoproducts. The objective of the present study is to assess the effect of TiO2 NPs on the symbiotic behaviour of AMF colonising rice (Oryza sativa L.) plants. Using sol–gel method, TiO2 NPs with three different sizes were successfully synthesised employing doping. Characterisation of the prepared material was done by X‐ray powder diffraction and scanning electron microscopy. The synthesised materials were applied at 0, 25, 50 and 100 mg plant–1 to the rhizosphere of mycorrhizal rice plants maintained in pots. The study revealed that the prepared NPs had an inhibitory effect on arbuscular mycorrhizal symbiosis in plant roots. Development of AMF structures such as vesicles and arbuscules was significantly reduced in TiO2 ‐doped NPs with a relatively more inhibition in 2% TiO2 ‐doped NPs. Among the concentrations of TiO2 NPs applied to different treatments, %F was significantly (P < 0.001) affected at medium to higher levels of application.Inspec keywords: nanoparticles, titanium compounds, antibacterial activity, sol‐gel processing, X‐ray diffraction, scanning electron microscopy, microorganisms, cellular biophysics, nanomedicineOther keywords: symbiotic arbuscular mycorrhizal fungi, plant roots, nanoparticles, antimicrobial properties, fertilisers, plant protection, nanoproducts, AMF colonising rice, sol‐gel method, X‐ray powder diffraction, scanning electron microscopy, mycorrhizal rice plants, rhizosphere, arbuscular mycorrhizal symbiosis, soil biota, TiO2 相似文献
29.
Vishal Kandathil Akshay Moolakkil Pranav Kulkarni Alaap Kumizhi Veetil Manjunatha Kempasiddaiah Sasidhar Balappa Somappa R. Geetha Balakrishna Siddappa A. Patil 《Frontiers of Chemical Science and Engineering》2022,16(10):1514
The current work describes the synthesis of a new bio-waste derived cellulosic-carbon supported-palladium nanoparticles enriched magnetic nanocatalyst (Pd/Fe3O4@C) using a simple multi-step process under aerobic conditions. Under mild reaction conditions, the Pd/Fe3O4@C magnetic nanocatalyst demonstrated excellent catalytic activity in the Hiyama cross-coupling reaction for a variety of substrates. Also, the Pd/Fe3O4@C magnetic nanocatalyst exhibited excellent catalytic activity up to five recycles without significant catalytic activity loss in the Hiyama cross-coupling reaction. Also, we explored the use of Pd/Fe3O4@C magnetic nanocatalyst as an electrocatalyst for hydrogen evolution reaction. Interestingly, the Pd/Fe3O4@C magnetic nanocatalyst exhibited better electrochemical activity compared to bare carbon and magnetite (Fe3O4 nanoparticles) with an overpotential of 293 mV at a current density of 10 mA·cm–2. 相似文献
30.
Karathan Parakkandi Priyanka Ani Kurian Kagalagodu Manjunthiah Balakrishna Thomas Varghese 《IET nanobiotechnology / IET》2018,12(5):579
The concern regarding the toxicological effects of nanoparticles (NPs) on the terrestrial environment is increasing. To avoid risks of exposure to these NPs in the environment, it is essential to develop an understanding of their reactivity, toxicity, and persistency. Due to the increased usage of nano‐titanium dioxide (TiO2) in various industrial products, an exponential increase in exposure is expected, which would exacerbate concerns about its ecological risks. The present study is conducted to evaluate the size‐dependent effects of TiO2 NPs on the soil, especially on earthworm (Eudrilus euginiae). To date, many studies have been reported on the impact of TiO2 NPs on ecotoxicology. However, histotoxicology studies are sparse. This study serves to be the first report on the size‐dependent histotoxicological impact of nano‐TiO2 on earthworms particularly, E. euginiae. This report presents an intensive overall view of the longer time ecotoxicological impact of TiO2 nanomaterials on various biological parameters of earthworms at cellular levels. The results show that the survival and growth of adult earthworms are severely affected by the TiO2 NPs in the soil, which substantiates the adverse effects of TiO2 NPs on earthworms.Inspec keywords: nanobiotechnology, nanoparticles, titanium compounds, semiconductor materials, toxicology, zoology, soil, cellular biophysics, particle sizeOther keywords: toxicological impact, nanoparticles, Eudrilus euginiae, terrestrial environment, soil, earthworm, ecotoxicology, size‐dependent histotoxicological impact, nanomaterials, biological parameters, cellular levels, TiO2 相似文献