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Ashish Madhual,Aparna Prabha Devi,Pravat Manjari Mishra 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Residual dyes on the earth’s surface are considered the most endangered and hazardous chemical waste,which severely contaminates the environment. Hence, systematic and strategic protocols should be carriedout to degrade these dyes. The utilization of solar energy as the renewable energy carrier and semiconductorphotocatalysts as the recyclable and sustainable catalyst for dye degradation is considered apromising method to monitor environmental remediation. Here we report a sustainable photocatalystusing room temperature-assisted green synthesis of hybrid plasmonic Au/g-CN photocatalyst using A. carambola leaf extract as a reducing as well as a stabilizing agent for Au nanoparticles (AuNPs) for degradationof RhB. The biomolecules present in the leaf extract reduce Au+3 to Au0 over the 2D surface of g-CNwithout using any toxic chemical-reducing agents. The structural, elemental, morphological, and opticalproperties of prepared nanocomposites are characterized by XRD, FTIR, XPS, TEM, HAADF-STEM, and PLtechniques. The AuNPs successfully anchored on the surface of g-CN, having an average diameter of 25±1nm. The photocatalytic degradation efficiency of 3Au/g-CN was found to be 99.4% for 10 ppm of RhBaqueous solution. The kinetics of the degradation were found to follow a pseudo-first-order reaction witha rate constant of 0.169 min1. The photo-harvesting ability is enhanced by both the surface plasmon resonance(SPR) effect of Au and the electron-acceptor property of g-CN. Moreover, the 3Au/g-CN plasmoniccomposite was reusable up to 5 cycles.
Himanshu Mishra,Vikas Kumar,Ashish Kumar 국립중앙과학관 2018 Journal of Asia-Pacific Biodiversity Vol.11 No.3
A field study was carried out to investigate the population status, behavior, and distribution pattern of river lapwings during the study period of 2015–2017 in the Raebareli district, Uttar Pradesh, India. There was a significant difference in the mean population of river lapwings along the study sites but less significant difference in the mean population seasonally. An average of 541 individuals of river lapwings have been reported during the study period. The mean population size was maximum (164.5 ± 28.67) at Gegaso in 2016 and minimum (56.25 ± 28.34) at Sultanpur Barhaia in 2017, whereas the seasonal population status showed maximum (199.5 ± 2.12) count in the summer season at Gegaso and minimum (52.0 ± 4.2) in winter at Sultanpur Barhaia. Moreover, maximum (n = 38) nesting pairs were estimated at Gegaso and least (n = 11) at Unchahar. There was less significant difference in the number of chicks counted in both the breeding seasons (2016 and 2017), but significantly a higher number of chicks (n = 86) were documented at Gegaso and least (n = 25) at Sultanpur Barhaia. Overall, there was no significant difference in the behavioral activities during the breeding and nonbreeding season. The present study clearly indicates that the river bank was the most preferred habitat type and that the distribution pattern was found to be clumped in river lapwings.
Rohit Sharma,Ashish Kumar,Anit Dawar,Sunil Ojha,Ambuj Mishra,Anshu Goyal,Radhapiyari Laishram,V. G. Sathe,RITU SRIVASTAVA,Om Prakash Sinha 한국전기전자재료학회 2023 Transactions on Electrical and Electronic Material Vol.24 No.2
Field effect transistors (FETs) are considered as the backbone of electronic industry. In this study, we adopted a simple drop cast method for the fabrication of MoS2 and WS2 channel based FET on commercially available pre-patterned OFET devices. The synthesis of few-layers thick MoS2 and WS2 nanosheets (NSs) has been done by solvent-assisted exfoliation method. FESEM and TEM study reveals that NSs have lateral dimensions in micron and have polycrystalline nature. From XPS, it is observed that MoS2 NSs has 2H phase whereas WS2 have hybrid 1T and 2H phase. The frequency difference in Raman vibrational mode for MoS2 and WS2 NSs is 24.08 cm-1 and 63.84 cm-1 respectively, confirms that number of layers is reduced after sonication. UV-visible spectroscopy reveals that the bandgap is 1.7 eV and 1.8 eV for MoS2 and WS2 NSs respectively. Later, these nanosheets have been drop-casted as the channel material on pre-patterned FETs devices and their output and transfer characteristics have been studied. It found that the current On/Off ratio is 10 4 and 10 3 for MoS 2 and WS2-FET device respectively. This facile fabrication of FET devices may provide a new stage for researchers who do not have access of lithography facilities for FET fabrication.
Hetal Patel,Aakash Ghayal,Ashish Mishra,Shailesh Shah 한국약제학회 2015 Journal of Pharmaceutical Investigation Vol.45 No.1
The objective of present investigation was toprepare and evaluate directly compressible co-processedexcipient for sustained release tablets. Tramadol hydrochloridewas selected as a model drug. Percentage ofglyceryl monostearate, proportion of dicalcium phosphatedihydrate with respect to glyceryl monostearate and concentrationof polyvinyl pyrrolidone (PVP K30) wereselected as independent variables in 3³ Box–Behnkendesign. Percentage drug release at given time (Q3, Q6, Q12)and Carr’s index were selected as dependent variables. Glyceryl monostearate and dicalcium phosphate dihydrateblend was granulated with PVP K30 and passed through 30mesh sieve to prepare co-processed excipient. This wasevaluated for percentage fines, Carr’s index, particle sizedistribution and granular friability index. Drug was mixedwith co-processed excipient and sustained release tabletswere prepared and evaluated. Regression analysis wascarried out to evolve full and refined models. Contour plotswere presented for graphical expression of the results. Themechanism of drug release from all batches followed Fickiandiffusion. Optimized batch was found to be stable for3 months at accelerated conditions (40 ˚C/75 % RH). Itcan be concluded that multifunctional directly compressibleco-processed excipient of glyceryl monostearate anddicalcium phosphate dihydrate can successfully be used tosustain the release of highly water soluble drugs.
Vikas Kumar,Himanshu Mishra,Ashish Kumar 국립중앙과학관 2021 Journal of Asia-Pacific Biodiversity Vol.14 No.1
A total of 415 individuals of river lapwing were counted in four habitats namely open, unvegetated riverbank, vegetated river bank, river island and crop field, whereas foraging behavior was observed by focalobservation. River lapwings used walk-halt-peck technique most frequently throughout the year in allthe four habitats. Our study suggested that foraging techniques in all the four habitats were non-significantwhereas foraging success varied significantly (p¼0.049, df ¼ 3). During summer, the feeding ratewas significantly different (p˂< 0.0001, F ¼ 12.43, df ¼ 2) at open, unvegetated, river bank from otherhabitats. Moreover, foraging success rate was observed to be varied significantly (p < 0.0001, F ¼13.52, df¼ 2) in all the seasons and across all the habitats. The present study suggests that open, unvegetated riverbank was most preferred habitat since foraging success was significantly different in this habitat.
Effect of microstructure and cutting speed on machining behavior of Ti6Al4V alloy
Sagar V. Telrandhe,Ashish K. Saxena,Sushil Mishra 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.5
Machining of aerospace and biomedical grade titanium alloys has always been a challenge because of their low conductivity and elastic modulus. Different machining methods and parameters have been adopted for high precision machining of titanium alloys. Machining of titanium alloys can be improved by microstructure optimization. The present study focuses on the effect of microstructure on machinability of Ti6Al4V alloys at different cutting speeds. Samples were subjected to different annealing conditions resulting in different grain sizes and local micro-strains (misorientation). Cutting forces were significantly reduced after annealing; consequently, sub-surface residual stresses were reduced. Deformation twinning was also observed on samples annealed at a higher temperature due to larger grain size. Initial strain free grains and deformation twinning during machining reduces the cutting force at higher cutting speed.
Rahul,Kulbhushan Haldeniya,Ashish Singh,Neha Bhatt,Prabhakar Mishra,Rajneesh Kumar Singh,Rajan Saxena 한국간담췌외과학회 2021 Annals of hepato-biliary-pancreatic surgery Vol.25 No.4
Backgrounds/Aims: Re-resection of incidental gallbladder carcinoma (IGBC) is possible in a select group of patients. However, the optimal timing for re-intervention lacks consensus. Methods: A retrospective analysis was performed for a prospective database of 91 patients with IGBC managed from 2009 to 2018. Patients were divided into three groups based on the duration between the index cholecystectomy and re-operation or final staging: Early (E), < 4 weeks; Intermediate (I), > 4 weeks and < 12 weeks; and Late (L), > 12 weeks. Demographic data, tumor characteristics, and operative details of patients were analyzed to determine factors affecting the re-resectability of IGBC. Results: Twenty-two patients in ‘E’, 48 in ‘I’, and 21 in ‘L’ groups were evenly matched. Nearly two thirds were asymptomatic. Curative resection was possible in 48 (52.7%) patients. Metastasis was detected during staging laparoscopy (SL)/laparotomy in 26 (28.6%) patients. The yield of SL was more in the ‘L’ group (30.8%) than in the ‘I’ (11.1%) or ‘E’ (nil) group, avoiding unnecessary laparotomy in 13.6%. Only 28.5% of patients in the ‘L’ group could undergo curative resection (R0/R1 resection), significantly less than that in the ‘E’ (50.0%) or ‘I’ group (64.6%) (both p < 0.001). On multivariate analysis, presentation in intermediate period and tumor differentiation increased the chance of curative resection (p < 0.05). Conclusions: Asymptomatic patients in the ‘I’ group with well differentiated IGBC have the best chance of obtaining a curative resection.
Sharad Kumar Dwivedi,Santosh Kumar,Narayan Bhakta,Ashish Kumar Srivastava,Janki Sharan Mishra,Virendar Kumar,B H Kumara,Bhagwati Prasad Bhatt,Sudhanshu Singh 한국작물학회 2018 Journal of crop science and biotechnology Vol.21 No.4
In flood-prone areas, rice must have flood tolerance characteristics either through genotypic selections or by nutrient application management strategies. The current study was conducted at ICAR Research Complex for Eastern Region, Patna during the wet season to investigate the effect of post-flood nutrient application methods on submerged rice survival and productivity. Our study showed that the 3-d submergence duration had no effect on the survival (100%) of 21-day-old seedlings but survival percentage decreased to 97 and 65% at 7-d and 11-d submergence, respectively. Total chlorophyll, total soluble sugar, and starch concentrations also exhibited a similar pattern of decline. The activity of anti-oxidative defense enzymes (CAT, POX, SOD, and APX), recorded just after de-submergence was found to be 1.5-10-foldhigher than before submergence, increasing with the increase in the severity of stress. Additional post-flood application of K2O and N at 5-6 days after de-submergence led to the improvement in photosynthetic rate, yield attributes, and grain yield. An additional 10 kg each of N and K2O produced maximum 1000-grain weight and higher grain yield and harvest index. After submergence, the meta-analysis exhibited a significant reduction in total chlorophyll concentration due to increasing submergence duration, whereas the significantly higher activity of antioxidants was recorded irrespective of submergence duration. In association with the better anti-oxidative defense mechanism of Sub1 varieties, the additional doses of N and K2O at 5-d after de-submergence significantly enhanced the survival, post-flood recovery, and the rate of photosynthesis after de-submergence. These nutrient management options can provide an opportunity to explore the productivity potential of the SUB1-introgressed variety under natural flash-flood conditions, helping to cope with the existing problems in flood-prone areas. The findings of the study suggest that a proper time and method of N application with basal P can significantly contribute to higher rice yield in flash-flood prone areas.