33 research outputs found
Trichoglossum benghalense N. Chakr., Tarafder & K. Acharya 2022, sp. nov.
No full textTrichoglossum benghalense N. Chakr., Tarafder & K. Acharya, sp. nov., FIGURE 2 & 3 Mycobank: MB 836100 Genbank: MT573336 Type: INDIA, West Bengal, Howrah district, Sarenga town, N 22° 5345’, E 88° 2237’, 6 m a.s.l., 24 Aug. 2019, Nilanjan Chakraborty, SAR 08 (holotype: CUH AM698). Etymology: The specific epithet ‘ benghalense ’ was named in recognition to the location of West Bengal, India. Diagnosis: Apothecia clavate, hirsute, black, 2–6 mm diam. × 20–35 mm high. Hymenium containing long, blackish, single septate hymenial setae. Asci 8-spored, long, amyloid. Ascospores 0-7 septate, long.Published as part of Chakraborty, Nilanjan, Tarafder, Entaj, Paul, Anamika, Paloi, Soumitra & Acharya, Krishnendu, 2022, Trichoglossum benghalense (Geoglossales, Ascomycota) from India: new to science, pp. 72-82 in Phytotaxa 536 (1) on page 75, DOI: 10.11646/phytotaxa.536.1.4, http://zenodo.org/record/622449
Trichoglossum benghalense (Geoglossales, Ascomycota) from India: new to science
No full textChakraborty, Nilanjan, Tarafder, Entaj, Paul, Anamika, Paloi, Soumitra, Acharya, Krishnendu (2022): Trichoglossum benghalense (Geoglossales, Ascomycota) from India: new to science. Phytotaxa 536 (1): 72-82, DOI: 10.11646/phytotaxa.536.1.
Experimental and numerical study of ball indentation for evaluation of mechanical properties and fracture toughness of structural steel
No full textInfluence of multiaxial cyclic plastic loading on grain boundary misorientation profile in austenitic stainless steel
No full text304LN stainless was subjected to multiaxial loading employing different waveforms and load paths. The grain boundary misorientation profile so obtained post deformation was compared across loading conditions. It was found that the uniaxial and proportional conditions of loading result in more of twins, contrary to non-proportional loading conditions that resulted in substantially higher low angle grain boundaries. Also, under non-proportional loading the trapezoidal load path resulted in remarkably altered distribution of the grain boundaries compared to its contemporaries. Predominant martensitic transformation was found to be dominant mechanism of deformation for trapezoidal loading that also contributed to the altered misorientation profile
Influence of axial and torsional cyclic loading on the fatigue behavior of 304LN stainless steel using solid and hollow specimens
No full textEffect of loading path and geometry on fatigue behavior was evaluated for 304LN stainless steel using solid and thin walled hollow specimens. Hollow specimens were subjected to both axial and shear loading under strain control. Solid specimens were used only for strain controlled axial loading. Fatigue life was highest for shear loading despite the higher stress response and the least for the axial loading for hollow specimens. The cyclic deformation behavior marked by Masing behavior, cyclic stress strain curves and probability density function analysis was found to be remarkably different for shear loading. All disparities in the cyclic deformation behavior due to difference in loading path has been accounted by the dislocation dynamics and martensitic transformation investigated through TEM
Characterization of Tempering Behaviour of Modified 9Cr-1Mo Steel by Ultrasonic Lamb wave Mixing
No full textThis work demonstrates the use of mixing of ultrasonic Lamb waves to characterize the tempering behaviour in metallic plate. Lamb wave mixing has been used to measure the generated second harmonic during tempering of mod.9Cr-1Mo steel plate. As-received material is normalized at 1080°C and then tempered in the temperature range of 600 - 850°C with a step size of 50°C for 1.5hrs and followed by furnace cooling. Lamb wave mixing technique has been used to assess the tempering behaviour of this material. Nonlinear ultrasonic parameter β which is the ratio of 2nd harmonic amplitude to the multiplication of the fundamental amplitudes is determined from the mixing wave at each temperature and correlated with microstructural characteristics. It is seen that this nonlinear acoustic parameter (β) is sensitive towards coherency strain generated between precipitate and matrix during tempering
Unprecedented Electroreduction of CO<sub>2</sub> over Metal Organic Framework-Derived Intermetallic Nano-Alloy Cu<sub>0.85</sub>Ni<sub>0.15</sub>/C
No full textDesigning
suitable catalysts for efficient and selective electrocatalytic
reduction of CO2 is a need of the hour, and in this regard,
the well-defined, highly dispersed active metal centers can be a trendsetting
research endeavor toward CO2 electroreduction due to the
maximum atom utilization and unique electronic structure. This study
describes the synthesis and electrocatalytic CO2 reduction
activity of atomistically dispersed Cu/C and Ni/C and the intermetallic
nano-alloy Cu0.85Ni0.15/C. The catalysts were
synthesized from the corresponding MOF precursors. The successful
synthesis of the monometallic and intermetallic nano-alloys was established
from structural, surface morphological, and electronic properties.
Cu0.85Ni0.15/C exhibited an unprecedented electrocatalytic
reduction of CO2 with a high selectivity and high faradaic
efficiency toward CH3OH. The kinetic studies and the first-principles
calculations elucidated the intricate mechanism and the superior activity
of electrocatalytic reduction of CO2 over the intermetallic
Cu0.85Ni0.15/C catalyst
Nonlinear Lamb wave mixing for assessing localized deformation during creep
Get PDFNonlinear ultrasonic is known to be a promising technique to characterize the microstructural degradation in
engineering materials. This work demonstrates the use of nonlinear Lamb wave mixing technique to assess the
localized deformation in modified 9Cr–1Mo steel during creep. Two Lamb wave modes of different frequencies
( ω 1 & ω 2) are allowed to mix within the material under certain resonant condition to generate third type of
harmonic waves of frequencies ( ω 1 ω 2). This new generated wave carries the information of material nonline-
arity from the mixing site and independent of the other extraneous nonlinear factors. Amplitude of the generated
third wave depends on the third order elastic constants of the material. This study reveals that nonlinear Lamb
wave mixing technique could be used to assess the localized deformation much prior to its failure
Correlation of Fractographic Features with Mechanical Properties in Systematically Varied Microstructures of Cu-Strengthened High-Strength Low-Alloy Steel
No full textFracture is often the culmination of continued deformation. Therefore, it is probable that a fracture surface may contain an imprint of the deformation processes that were operative. In this study, the deformation behavior of copper-strengthened high-strength low-alloy (HSLA) 100 steel has been investigated. Systematic variation of the microstructure has been introduced in the steel through various aging treatments. Due to aging, the coherency, size, shape, and distribution of the copper precipitates were changed, while those of inclusions, carbides, and carbonitrides were kept unaltered. Two-dimensional dimple morphologies, quantified from tensile fracture surfaces, have been correlated to the nature of the variation of the deformation parameters with aging treatment
