排序方式: 共有12条查询结果,搜索用时 31 毫秒
1.
Himangshu Pal Shuvam Bhubna Praduman Kumar Rajat Mahapatra Somenath Chatterjee 《Journal of Materials Engineering and Performance》2018,27(6):2668-2672
In this paper, the graphene was synthesized using biocompatible cellulosic component from onions. Onion epidermal cells were chosen as raw material. During heating at high temperature, the bonding among atoms in material was rearranged and forms two-dimensional hexagonal carbon layer (graphene). The characterization of synthesized graphene was done by x-ray diffractometer, Raman spectrometer and field emission scanning electron microscopy, respectively. An attempt has been taken to form the capacitors with two different current collector electrodes, anticipating the performance of the supercapacitors. The observed capacitance values as-obtained for Al and Au current collector were 1.3 μF and 6.08 μF, respectively. However, when thermally exfoliated graphene was used as an electrode on Al and Au current collector, the capacitance value was drastically increased and found to be 1.6 and 41.25 μF, respectively. 相似文献
2.
Ajoy K. Ray Ranjan K. Sahu V. Rajinikanth Himangshu Bapari Mainak Ghosh Parimal Paul 《Carbon》2012,50(11):4123-4129
A simple method is reported for preparing graphene and nickel-decorated graphene from the petals of lotus and hibiscus flowers by heating the original petals and petals soaked in a nickel(II) chloride solution ranging 800–1600 °C under a flowing argon atmosphere for 0.5 h. The products have been characterized by scanning and transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. Graphene prepared at high temperature (>1200 °C) is purer than that obtained at a lower temperature (800 °C). The presence of nickel has been found to have improved the quality of the graphene and electron density near the Fermi energy level. 相似文献
3.
4.
Himangshu Deka Rupam Sarma Jubaraj B. Baruah 《Journal of Inorganic and Organometallic Polymers and Materials》2011,21(2):384-390
A design principle for seven coordinated metal carboxylate complexes and coordination polymers of Mn(II), Cd(II) and Na(I)
derived from (3-carboxymethoxy-naphthalen-2-yloxy)-acetic acid (LH2) is presented. The complexes/coordination polymer [Mn(L)(H2O)3]·3H2O (1), [{Cd(L)(H2O)2}·H2O]n (2); [Cd(L)(py)3]·3H2O (3) have metal ions in pentagonal bipyramid environments (py = pyridine). The coordination polymer [{Cd(L)(H2O)2}·H2O]n (2) may be considered to be the self-assembly of hexacoordinated [Cd(L)(H2O)2] units; it reacts with pyridine to form mono-nuclear complex 3. Depending on the reaction conditions, Ni-coordination polymers of L adopt different compositions. From the reaction carried out with NiCl2 and NaOH in quinoline and water, a hetero bimetallic coordination polymer; namely, [[NaL(H2O)]2Ni(H2O)4]n (4) is obtained. A similar reaction in pyridine-water solvent led to [{Ni(L)(py)3}.py]n (5). The coordination polymer 5 has pyridine in its interstices held by C–H···π interactions. 相似文献
5.
In this work, the effect of sodium chloride (NaCl) on thermodynamic properties of CH4+CO2+N2 hydrate formation and equilibrium condition has been studied. The three-phase (hydrate–liquid–gas) equilibrium calculation has been carried out using the Peng–Robinson equation of state (PR EoS) and Universal Quasi Chemical (UNIQUAC) activity coefficient models. The PR EoS coupled with classic mixing rule is applied for the vapor phase. The calculations of the gas hydrate formation pressures are performed in the absence and presence of sodium chloride inhibitor for the gas hydrate systems. The Chen–Guo model has been used for the hydrate phase and the UNIQUAC activity coefficient is applied for non-ideality of the liquid phase. To obtain higher accuracy, the solubility of the gases in the aqueous phase is also taken into account using pressure corrected Henry's law. Finally, the stepwise procedure has been followed to obtain the results and compared with the experimental results. The addition of 2% (by volume) sodium chloride to water results in large shifts in phase equilibrium boundary to increase pressure for the same temperature condition. 相似文献
6.
A low-viscosity emulsion of crude oil in water
can be believed to be the bulk of a flow regime in a
pipeline. To differentiate which crude oil would and which
would not counter the blockage of flow due to gas hydrate
formation in flow channels, varying amount of crude oil in
water emulsion without any other extraneous additives has
undergone methane gas hydrate formation in an autoclave
cell. Crude oil was able to thermodynamically inhibit the
gas hydrate formation as observed from its hydrate stability
zone. The normalized rate of hydrate formation in the
emulsion has been calculated from an illustrative chemical
affinity model, which showed a decrease in the methane
consumption (decreased normalized rate constant) with an
increase in the oil content in the emulsion. Fourier transform
infrared spectroscopy (FTIR) of the emulsion and
characteristic properties of the crude oil have been used to
find the chemical component that could be pivotal in selfinhibitory
characteristic of the crude oil collected from
Ankleshwar, India, against a situation of clogged flow due
to formation of gas hydrate and establish flow assurance. 相似文献
7.
Rakesh Arya Deepti Dabral Hossain Md. Faruquee Himangshu Mazumdar Saurav Jyoti Patgiri Trinayan Deka Rumi Basumatary Rukuwe‐u Kupa Chayale Semy Wetetsho Kapfo Kevideme Liegise Inderjeet Kaur Tenzin Choedon Purnima Kumar Rajendra Kumar Behera Pranjal Deori Reema Nath Kerekha Khalo Lahari Saikia Vinotsole Khamo Ranjan Kumar Nanda 《Proteomics. Clinical applications》2020,14(1)
8.
Rakesh Arya Deepti Dabral Hossain Md. Faruquee Himangshu Mazumdar Saurav Jyoti Patgiri Trinayan Deka Rumi Basumatary Rukuwe‐u Kupa Chayale Semy Wetetsho Kapfo Kevideme Liegise Inderjeet Kaur Tenzin Choedon Purnima Kumar Rajendra Kumar Behera Pranjal Deori Reema Nath Kerekha Khalo Lahari Saikia Vinotsole Khamo Ranjan Kumar Nanda 《Proteomics. Clinical applications》2020,14(1)
9.
A pre-feasibility of wind-PV-battery hybrid system has been performed for a small community in the east-southern part of Bangladesh. Solar radiation resources have been assessed from other meteorological parameters like sunshine duration and cloud cover as measured radiation data were not available at the site. The predicted monthly averaged daily global radiation over Chittagong is 4.36 kWh/m2/day. Measured wind speed at the site varies from 3 m/s to 5 m/s. For few months and hours the speed is below the cut in speeds of the available turbines in market. The hybrid system analysis has showed that for a small community consuming 53,317 kWh/year the cost energy is 0.47USD/kWh with 10% annual capacity of shortage and produces 89,151 kWh/year in which 53% electricity comes from wind and the remaining from solar energy. The sensitivity analysis showed that the hybrid system for the community is compatible with the 8 km–12 km grid extension depending on small variation of solar radiation and wind speed over the district whereas the proposed site is more away from the upper limit. Such a hybrid system will reduce about 25 tCO2/yr green house gases (GHG) emission in the local atmosphere. 相似文献
10.
Kutubdia is an island in the southern coast of Bangladesh where mainland grid electricity is not present or would not feasible in near future. Presently, electricity is generated using a diesel generator by Bangladesh Power Development Board (BPDB) for a limited time and location. Due to its remote location, the fuel cost in Kutubdia is very expensive. In the present study one-year recorded wind by Bangladesh Centre of Advanced Studies (BCAS) location and other three potential locations for hybrid system analysis is discussed. The system configuration of the hybrid is achieved based on a theoretical domestic load at the island. The sizing of the hybrid power systems is discussed with 0% and 5% annual capacity of shortage. This feasibility study indicates that wind–PV–diesel system is feasible with 0% capacity of shortage and wind–diesel system is feasible with 5% annual capacity of shortage at all locations. As 5% annual capacity of shortage can be considered, the wind–diesel hybrid system will reduce net present cost as well as cost of energy to about 20% and the diesel consumption on the island can be reduced to about 50% of its present annual consumption. Such a hybrid system will reduce about 44% green house gases (GHG) from the local atmosphere. 相似文献