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71.
Vivek Sharma Priyanka Parashar Priyanka Srivastava Santosh kumar D. D. Agarwal Neelam Richharia 《应用聚合物科学杂志》2013,129(3):1513-1519
The degradation of PET bottles has been successfully achieved using hydrotalcite as catalyst and dimethyl sulfoxide (DMSO) as solvent. The reaction was carried out at boiling point of DMSO (190°C) and degradation was complete in 10 min. The oligomer (tetramer) obtained was treated with NaOH at room temperature in methanol to get dimethyl terephthalate (DMT) and ethylene glycol (EG). Thus, it is a safe and cleaner process. Oligomer was characterized by MS, 13 C‐NMR, X‐ray diffractometric, and thermogravimetric analysis. DMT and EG were characterized by GC‐MS. DMT was also characterized by FT‐IR. GC‐MS analysis shows that the purity of DMT was 99%. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2012 相似文献
72.
Amit Kumar Neelam Upadhyay Darshan Lal Anil Kumar Kamal Gandhi Vivek Sharma 《International Journal of Dairy Technology》2016,69(2):294-300
The changes in milk fat during the preparation and storage of khoa were studied in three different seasons. Milk fat was extracted from the samples with chloroform using Soxhlet extraction. The solvent was evaporated using a vacuum evaporator followed by nitrogen flushing. The extracted fat samples were analysed for Reichert–Meissl, Polenske, saponification and iodine values, butyro‐refractometer reading at 40 °C and free fatty acids (FFAs). The study revealed an increase in the FFA content during conversion and storage of khoa, while there were small changes in other physicochemical properties of milk fat during the preparation of khoa from raw milk and its subsequent storage at room temperature. 相似文献
73.
Cells of Salmonella enterica serovar Enteritidis were grown at 25 and 35 degrees C, heat injured (55, 60, and 62.5 degrees C), and recovered in tryptic soy broth (TSB) at various NaCl concentrations (2.0 and 3.5%) and pH levels (5.5 and 6.5). To assess the interactions of growth temperature, heating temperature, NaCl concentration and pH on the thermal injury and recovery of Salmonella Enteritidis in ground chicken, a randomized design with each experimental combination was used. When a logistic equation for nonlinear survival curves was used, D-values of cells of Salmonella Enteritidis grown at 25 degrees C were 7.60, 5.73, and 4.81 min at 55, 60, and 62.5 degrees C, respectively. For cells grown at 35 degrees C, the D-values were 12.38, 7.45, and 5.70 min at 55, 60, and 62.5 degrees C. The influence of tryptic soy agar and double modified lysine agar (DMLIA) on the recovery of heat-injured cells was determined. Recovery was significantly reduced on DMLIA at increased pH levels and NaCl concentrations. Higher numbers of cells were recovered in TSB with 2.0% NaCl than in TSB with 3.5% NaCl. It was observed that the rate of recovery of heat-injured cells was similar at each pH. Therefore, a pH range of 5.5 to 6.5 does not have a major inhibitory effect on the recovery of Salmonella Enteritidis. 相似文献
74.
Neelam Kumari 《Materials Research Bulletin》2010,45(4):464-473
The optical properties of Bi2V1−xMnxO5.5−x {x = 0.05, 0.1, 0.15 and 0.2 at.%} thin films fabricated by pulsed laser deposition on platinized silicon substrates were studied in UV-visible spectral region (1.51-4.17 eV) using spectroscopic ellipsometry. The optical constants and thicknesses of these films have been obtained by fitting the ellipsometric data (Ψ and Δ) using a multilayer four-phase model system and a relaxed Lorentz oscillator dispersion relation. The surface roughness and film thickness obtained by spectroscopic ellipsometry were found to be consistent with the results obtained by atomic force and scanning electron microscopy. The refractive index measured at 650 nm does not show any marginal increase with Mn content. Further, the extinction coefficient does not show much decrease with increasing Mn content. An increase in optical band gap energy from 2.52 to 2.77 eV with increasing Mn content from x = 0.05 to 0.15 was attributed to the increase in oxygen ion vacancy disorder. 相似文献
75.
Neelam Sharma 《Information Sciences》1981,24(2):135-141
The problem of coding for making decisions on the basis of a part of the received message has recently been studied. By extension of this idea, exponential error and erasure bounds are obtained. 相似文献
76.
The effect of water on the critical stress intensity factor,K
IC, of a highly unsaturated isophthalic polyester resin has been measured for periods of immersion of up to 2200 h in water at temperatures of 35, 70 and 80° C.K
IC decreased from 0.84±0.1 MN m–3/2 to 0.24±0.03 MN m–3/2 after immersion for 2200 h in water at 80° C. The observed changes in the critical stress intensity factor indicate that a constant value is eventually reached. This is consistent with the decline being attributable to the leaching of extractable matter from the polyester resin. 相似文献
77.
We developed two high-quality large-aperture acousto-optic tunable filter cells in TeO2 with more than two octaves spectral coverage for hyperspectral imaging applications from the visible to the midwave infrared: the first cell covers from 0.43 to 2.1 microm and the second from 0.69 to 4.0 microm. The key feature of these cells is a special design of two transducers in tandem with a special bonding technique that results in such a wide spectral coverage with virtually no acoustic and electrical loss due to careful matching of both acoustic and electrical impedances. Each of these cells has high spectral transmission, as well as low power requirement. We discuss the design, characterization, and performance results for these cells. 相似文献
78.
Polarization is an important addition to spectral imaging in detecting and identifying objects of interest, and simple linear polarization measurements are often inadequate. Full polarization analysis can give additional information for discrimination where the polarization state is completely described by the Stokes parameters. An acousto-optic tunable filter (AOTF) imaging system was built incorporating two liquid-crystal variable retarders (LCVRs) that can provide complete spectral-polarimetric analysis, and it is believed to be the first demonstration of a full Stokes polarimetric AOTF spectral imaging system with no moving parts. It is also shown that a single LCVR cannot provide all the Stokes parameters. 相似文献
79.
Bansal Khushboo Hooda Vikas Verma Neelam Kharewal Tannu Tehri Nimisha Dhull Vikas Gahlaut Anjum 《SILICON》2022,14(16):10173-10186
Silicon - Silicon (Si) is not considered as essential element for plant growth and development but it provides benefits to the plants in several ways. Due to distinguishing physiological features,... 相似文献
80.
Assam Benbaha Fatiha Yettou Boubakeur Azoui Amor Gama Neelam Rathore Narayan Lal Panwar 《亚洲传热研究》2024,53(4):2095-2127
This work focuses on the structure, working, and testing of a new mixed solar cooker using a linear Fresnel collector, evacuated tube and box-type cooker. The low-cost components used in the construction of this cooker can help it satisfy the needs of both urban and rural inhabitants who need steady cooking temperatures above 140°C. A family of five can prepare four meals using this modified solar cooker, which costs about $250. The designed solar cooker was tested by conducting no-load and full-load tests. For the no-load test, the maximum temperature of the absorber plate and oil for the new mixed cooker was recorded as 160.26°C and 172.72°C, respectively. The absorber plate of the new mixed cooker and its oil both reached their highest temperatures during the full-load test at 141.14°C and 157°C, respectively. The energy efficiency of the new cooker is 58.776%, while its exergy efficiency is 13%. The heat transfer coefficient increased to 100.16 W/m² °C. This cooker provides an additional time savings of 60 min. An improvement of 27.5% in the highest temperature reached was seen when the developed cooker's performance was compared with those reported in the literature. Additionally, the new cooker's heat-storing capability enables up to 3 h of autonomy. The Levelized Cost of Cooking a Meal for the innovative mixed solar cooker is $0.034 per meal. 相似文献