http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
ADA: Advanced data analytics methods for abnormal frequent episodes in the baseline data of ISD
Biswal Biswajit,Duncan Andrew,Sun Zaijing 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.11
The data collected by the In-Situ Decommissioning (ISD) sensors are time-specific, age-specific, and developmental stage-specific. Research has been done on the stream data collected by ISD testbed in the recent few years to seek both frequent episodes and abnormal frequent episodes. Frequent episodes in the data stream have confirmed the daily cycle of the sensor responses and established sequences of different types of sensors, which was verified by the experimental setup of the ISD Sensor Network Test Bed. However, the discovery of abnormal frequent episodes remained a challenge because these abnormal frequent episodes are very small signals and may be buried in the background noise of voltage and current changes. In this work, we proposed Advanced Data Analytics (ADA) methods that are applied to the baseline data to identify frequent episodes and extended our approach by adding more features extracted from the baseline data to discover abnormal frequent episodes, which may lead to the early indicators of ISD system failures. In the study, we have evaluated our approach using the baseline data, and the performance evaluation results show that our approach is able to discover frequent episodes as well as abnormal frequent episodes conveniently.
Biswal Bijaylaxmi,Mishra Dilip Kumar,Mohapatra Jyoshnarani,Bhuyan Satyanarayan 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.5
The conventional high-temperature solid-state reaction technique is used to synthesize aluminosilicate ceramics of three different compositions (Al 0.70 Si 0.30 O, Al 0.73 Si 0.27 O, Al 0.75 Si 0.25 O). These aluminosilicate ceramics are systematically investigated by XRD, FTIR, SEM, dielectric, electrical, and UV–visible analysis. The polycrystalline ceramics are well synthesized at a sintering temperature of 1450 °C, confirmed from XRD studies. The IR interferogram reveals the presence of mullite (3Al 2 O 3 2SiO 2 )-type molecules in these aluminosilicate ceramics. The SEM images show the formation of homogeneous microstructures with appreciable density. The room temperature dielectric constant values for Al 0.70 Si 0.30 O, Al 0.73 Si 0.27 O, Al 0.75 Si 0.25 O ceramics are 1.5, 1.8, and 1.7 at 1 MHz frequency with dielectric loss values of 0.02, 0.04, and 0.06 respectively. The ac conductivity spectrum of these samples obeys the Arrhenius equation and the classical correlated barrier hopping model governs the conduction mechanism in these ceramics. Complex impedance analysis confirms the contribution of both grain and grain boundary towards transport processes in these ceramics. The UV–visible spectrum reveals that the synthesized ceramics, Al 0.70 Si 0.30 O, Al 0.73 Si 0.27 O, and Al 0.75 Si 0.25 O have a wide-band-gap of the order of 3.45 eV, 3.42 eV, and 3.39 eV respectively. These ceramics can be preferably used as electronic substrates, packaging material for high-frequency circuits, and infrared transmitting window materials.
Biswal, B.,Hasan, Q.Z.,Sharma, K.,Dutta, N. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.7
Sixteen adult Barbari bucks were divided into 4 homogeneous groups, each group was offered wheat straw (WS) at levels 75, 100, 125 and 150 per cent of ad libitum intake in a factorial randomized complete block design. All goats were uniformly fed a supplement ($13.5g\;DM/kg\;W^{0.75}$) to fulfill their requirement for protein at maintenance level. The experimental feeding of goats at different levels for 21 days was followed by a digestion trial of 6 days and determination of rate of passage of digesta for 144 h duration, respectively. Intake ($g/kg\;W^{0.75}$) of dry matter (DM), organic matter (OM), digestible DM and digestible OM increased with increase in amount of WS offered. The levels of WS refusals for obtaining upper limit of intake was found to be above 30% of DMO. Concentration of ADF and lignin was significantly lower and CP was higher (p>0.05) in food ingested relative to food offered or refused in response to increasing allowance of WS. Dietary means of particulate rate of passage from rumen, transit time and total mean retention time ranged from 0.032 to 0.036/h, 19.10 to 21.72/h and 58.61 to 61.53/h respectively and did not show significant differences (p>0.05) irrespective of dietary level of WS. The results suggest that DMI and quality of ingested WS would improve with higher rates of offer and refusals (${\geq}30%$ of DMO) without any pronounced effect on passage kinetics of digesta, because of the greater opportunity afforded to goats for selective feeding.
Natural convection of nanofluid flow between two vertical flat plates with imprecise parameter
Biswal, U.,Chakraverty, S.,Ojha, B.K. Techno-Press 2020 Coupled systems mechanics Vol.9 No.3
Natural convection of nanofluid flow between two vertical flat plates has been analyzed in uncertain environment.Anon-Newtonian fluid SodiumAlginate (SA) as base fluid and nanoparticles ofCopper(Cu) are taken into consideration. In thepresentstudy,we have takennanoparticle volume fraction as an uncertain parameterin terms offuzzy number. Fuzzy uncertainties are controlled by r-cut and parametric concept. Homotopy PerturbationMethod (HPM) has been used to solve the governing fuzzy coupleddifferential equationsforthe titled problem.Forvalidation, presentresults are comparedwith existingresultsforsome special casesviz. crisp case andthey are foundto be ingood agreement.
Sodide and Organic Halides Effect Covalent Functionalization of Single-Layer and Bilayer Graphene
Biswal, Mandakini,Zhang, Xu,Schilter, David,Lee, Tae Kyung,Hwang, Dae Yeon,Saxena, Manav,Lee, Sun Hwa,Chen, Shanshan,Kwak, Sang Kyu,Bielawski, Christopher W.,Bacsa, Wolfgang S.,Ruoff, Rodney S. American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.11
<P>The covalent functionalization of single and bilayer graphene on SiO2 (300 nm)/Si was effected through sequential treatment with the alkalide reductant [K(15-crown-5)(2)]Na and electrophilic aryl or alkyl halides, of which the iodides proved to be the most reactive. The condensation reactions proceeded at room temperature and afforded the corresponding aryl- or alkyl-appended graphemes. For each sample, Raman and X-ray photoelectron spectroscopies were used to evaluate the degrees and uniformities of functionalization. Statistical analyses of the Raman data revealed that the introduction of the organic moieties was accompanied by sp(3)-rehybridization of the basal plane atoms. When bilayers consisting of C-13 and C-12 layers were treated, both the top and bottom sheets were decorated with organic groups. The reaction was followed using Raman spectroscopy, and the mechanism was studied by theoretical calculations. Indicative of its structure and reactivity, 4-pyridyl-decorated single-layer graphene was readily benzylated and appears to be an ideal platform to develop functional materials.</P>
Optimal vibration energy harvesting from nonprismatic piezolaminated beam
Alok R Biswal,Tarapada Roy,Rabindra K Behera 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.19 No.4
The present article encompasses a nonlinear finite element (FE) and genetic algorithm (GA) based optimal vibration energy harvesting from nonprismatic piezo-laminated cantilever beams. Three cases of cross section profiles (such as linear, parabolic and cubic) are modelled to analyse the geometric nonlinear effects on the output responses such as displacement, voltage, and power. The simultaneous effects of taper ratios (such as breadth and height taper) on the output power are also studied. The FE based nonlinear dynamic equation of motion has been solved by an implicit integration method (i.e., Newmark method in conjunction with the Newton-Raphson method). Besides this, a real coded GA based constrained optimization scheme has also been proposed to determine the best set of design variables for optimal harvesting of power within the safe limits of beam stress and PZT breakdown voltage.
Preparation and Experimental Investigation of Thermo-electro-mechanical Behavior of Ag-IPMC Actuator
Dillip Kumar Biswal,Dibakar Bandopadhya,Santosha Kumar Dwivedy 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
Traditional ionic polymer metal composites (IPMCs) composed of Nafion as the base polymer and mostly precious metal platinum/gold as the surface electrode. The proposed work deal with fabrication and investigation of thermo-electromechanical properties of artificial muscles i.e. ionic polymer-metal composites of non-precious metal silver (Ag) as surface electrode. Chemical decomposition method is followed and in-depth fabrication procedures are outlined. The microscopic and morphological analyses show dense packed silver (Ag) particles on the surface of the Nafion membrane. Several experiments are carried out such as bending test for measuring tip force and surface resistance. Dynamic-mechanical analysis (DMA) and thermo-mechanical analysis (TMA) are performed to evaluate the viscoelastic properties and performance of the actuator. The developed pure Ag-IPMC is inexpensive, exhibits superior performance and can be used as artificial muscle materials.
Highly Oriented Monolayer Graphene Grown on a Cu/Ni(111) Alloy Foil
Huang, Ming,Biswal, Mandakini,Park, Hyo Ju,Jin, Sunghwan,Qu, Deshun,Hong, Seokmo,Zhu, Zhili,Qiu, Lu,Luo, Da,Liu, Xiaochi,Yang, Zheng,Liu, Zhongliu,Huang, Yuan,Lim, Hyunseob,Yoo, Won Jong,Ding, Feng,Wa American Chemical Society 2018 ACS NANO Vol.12 No.6
<P>Fast-growth of single crystal monolayer graphene by CVD using methane and hydrogen has been achieved on “homemade” single crystal Cu/Ni(111) alloy foils over large area. Full coverage was achieved in 5 min or less for a particular range of composition (1.3 at.% to 8.6 at.% Ni), as compared to 60 min for a pure Cu(111) foil under identical growth conditions. These are the bulk atomic percentages of Ni, as a superstructure at the surface of these foils with stoichiometry Cu<SUB>6</SUB>Ni<SUB>1</SUB> (for 1.3 to 7.8 bulk at.% Ni in the Cu/Ni(111) foil) was discovered by low energy electron diffraction (LEED). Complete large area monolayer graphene films are either single crystal or close to single crystal, and include folded regions that are essentially parallel and that were likely wrinkles that “fell over” to bind to the surface; these folds are separated by large, wrinkle-free regions. The folds occur due to the buildup of interfacial compressive stress (and its release) during cooling of the foils from 1075 °C to room temperature. The fold heights measured by atomic force microscopy (AFM) and scanning tunneling microscopy (STM) prove them to all be 3 layers thick, and scanning electron microscopy (SEM) imaging shows them to be around 10 to 300 nm wide and separated by roughly 20 μm. These folds are always essentially perpendicular to the steps in this Cu/Ni(111) substrate. Joining of well-aligned graphene islands (in growths that were terminated prior to full film coverage) was investigated with high magnification SEM and aberration-corrected high-resolution transmission electron microscopy (TEM) as well as AFM, STM, and optical microscopy. These methods show that many of the “join regions” have folds, and these arise from interfacial adhesion mechanics (they are due to the buildup of compressive stress during cool-down, but these folds are different than for the continuous graphene films-they occur due to “weak links” in terms of the interface mechanics). Such Cu/Ni(111) alloy foils are promising substrates for the large-scale synthesis of single-crystal graphene film.</P> [FIG OMISSION]</BR>