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I_{\delta}-sets, I-o.h.i. Spaces and I-resolvability
Biswanath Garai,Chhanda Bandyopadhyay 경북대학교 자연과학대학 수학과 2004 Kyungpook mathematical journal Vol.44 No.3
Defining a new type of set called I-set we have characterized those sets. A sufficient condition have been given so that any two nonempty I-open sets intersect in a nonempty I-open set.
I-Dense Sets and I-o.h.i. Spaces
Biswanath Garai ..et al. KYUNGPOOK UNIVERSITY 2001 Kyungpook mathematical journal Vol.41 No.2
The aimof this paper is to study resolvability and irresolvability in terms of dense sets and ideals. Also giving the definition of an ideal called d-ideal several interesting results concerning d-ideal have been derived.
One New and Two Rare Alkamides from two samples of the Fruits of Piper Longum
Biswanath Das,A. Kashinatham,P. Madhusudhan 한국생약학회 1998 Natural Product Sciences Vol.4 No.1
Two samples of the fruits of Piper longum have been chemically investigated. From one sample a new alkamide, pergumidiene and from other sample two rare alkamides, brachystamide B and piperderdine have been isolated. The known compounds, piperine, piperlonguminine, pellitorine, (+)-sesamine and 3-(3`, 4`, 5`-trimethoxyphenyl)-propionic acid were the common constituents of both the samples.
Biswanath Bhowmik,Sachin Lakare,Avalokiteswar Sen,Kakali Bhadra 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.3
Morphological and peripheral olfactory responses of antennal chemosensilla of Apis cerana indica,worker honeybee, to commonly occurring plant volatiles were recorded using SEM and EAG techniques, respectively. The antennae of A. cerana indica reveal the predominance of olfactory sensilla besides gustatory and mechanoreceptor cells. Ten different types of olfactory sensilla including sensilla basiconica, placodea type A and B, chaetica, coeloconica, coelocapitula, trichodea type A, B, C and D were reported. Of these, trichodea B and placodea A types were reported to be maximum. Responses to 47 commonly occurring plant volatiles (including 10 aromatic, 12 aliphatic, 04 green leaf volatile, 10 hydrocarbonmonoterpene, 08 oxygenatedmonoterpenes and 03 sesquiterpenes compounds) were shown to elicit the response. Normalized EAG response, relative to the standard 1-hexanol, reveal significant differences between the chemicals and were concentration dependent. At 0.1 mg/mL dose, the largest amplitude was obtained with p-cymene (119.74 ± 6.94) followed by cinnamaldehyde (97.07±4.94) and veratrol (92.99±7.82). Furthermore, at 1.0 mg/mL, maximum stimulation was reportedwith cinnamaldehyde (92.02±4.26) followed by phenethyl alcohol (86.02±2.63), benzyl alcohol (70.53±2.47), 2-heptanone (67.71±5.02) and 1-heptanol (67.56±2.8). Again, amplitude of the responsewas found to be maximumwith cinnamaldehyde (115.59±6.73) followed by 1-heptanol (105.69±2.45) and citral (100.78 ± 4.93) at 5.0 mg/mL, whereas, at 10.0 mg/mL, phenethyl alcohol (93.45 ± 1.87) and 2-heptanone (93.14±1.85) showed highest stimulation followed by 2-pentanone (92.22±0.43). These documentations provide valuable information regarding how diversity in chemoreceptive antennal sensilla reveals better ability to sense a diversity of odors that are important cues to help honeybee distinguish among species of various flowering plants.
Coupling induced transparency and absorption in photon-magnon coupling
Biswanath Bhoi,Bosung Kim,Haechan Jeon,Sang-Koog Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
The prospect of a full control of electromagnetic waves has inspired intensive efforts on light-matter interactions in recent years. The two most interesting phenomena applicable to quantum information technology [1-3] are electromagnetically induced transparency (EIT) and absorption (EIA), arising from atomic coherences occurring in light-matter interaction. It is very difficult to construct a single system that exhibits both the phenomena simultaneously, due to the fact that conventional coupled systems often lack independent tenability and controllability of their eigenmodes. It is interesting to find a plausible method that would permit a single device where energy conversion or information transfer can be maximized through coupling-induced transparency (CIT) or absorption (CIA) [4-5]. In this regard, we fabricated a hybrid system composed of magnons (collective spin excitations) and microwave photons (electromagnetic excitations) in order to make them strongly couple with merits of flexibly tailored dispersion and damping rate [6-9]. Here we report on an experimental observation of the simultaneous occurrence of CIT and CIA in photon-magnon coupling (PMC) in a planar hybrid system that consists of a yttrium iron garnet (YIG) film and a multi-concentric inverted-split-ring resonator (ISRR). The observed CIT/CIA dispersions are ascribed to the multi-channel decay process through magnon-mediated interactions between the individual modes of concentric ISRR photon resonators. Furthermore, we achieved a substantial manipulation not only of CIT/CIA and coupling strength but also a reliable transition between different types of interactions by positioning differently the YIG film as well as varying the direction of bias dc magnetic fields. An analytical model adopting competition between the coherent and dissipative interactions is established to capture physical insights of magnon-mediated photon-photon interactions, which model precisely reproduces the experimental findings. This work provides promising guidance for designing effective, flexible, and controllable photon-magnonics devices that are highly demanded in the development of quantum technologies.