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Dark-photon searches via Higgs-boson production at the LHC
Biswas, Sanjoy,Gabrielli, Emidio,Heikinheimo, Matti,Mele, Barbara American Physical Society 2016 Physical review. D Vol.93 No.9
<P>Dark photons (gamma) over bar mediating long-range forces in a dark sector are predicted by various new physics scenarios, and are being intensively searched for in experiments. We extend a previous study of a new discovery process for dark photons proceeding via Higgs-boson production at the LHC. Thanks to the nondecoupling properties of the Higgs boson, BR(H ->gamma(gamma) over bar) values up to a few percent are possible for a massless dark photon, even for heavy dark-sector scenarios. The corresponding signature consists (for a Higgs boson at rest) of a striking monochromatic photon with energy E-gamma = m(H)/2, and a similar amount of missing energy. We perform a model-independent analysis at the LHC of both the gluon-fusion and vector-boson fusion (VBF) Higgs production mechanisms at 14 TeV, including parton-shower effects, and updating our previous parton-level analysis at 8 TeV in the gluon-fusion channel by a more realistic background modeling. We find that a 5 sigma sensitivity can be reached in the gluon-fusion channel for BR(H ->gamma(gamma) over bar) similar or equal to 0.1% with an integrated luminosity of L similar or equal to 300 fb(-1). The corresponding VBF reach is instead restricted to 1%. Such decay rates can be naturally obtained in dark-photon scenarios arising from unbroken U(1)(F) models explaining the origin and hierarchy of the Yukawa couplings, strongly motivating the search for this exotic Higgs decay at the LHC.</P>
Use of Lysozyme as a Feed Additive on In vitro Rumen Fermentation and Methane Emission
Biswas, Ashraf A.,Lee, Sung Sill,Mamuad, Lovelia L.,Kim, Seon-Ho,Choi, Yeon-Jae,Bae, Gui-Seck,Lee, Kichoon,Sung, Ha-Guyn,Lee, Sang-Suk Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.11
This study was conducted to determine the effect of lysozyme addition on in vitro rumen fermentation and to identify the lysozyme inclusion rate for abating methane ($CH_4$) production. An in vitro ruminal fermentation technique was done using a commercial concentrate to rice straw ratio of 8:2 as substrate. The following treatments were applied wherein lysozyme was added into 1 mg dry matter substrate at different levels of inclusion: Without lysozyme, 2,000, 4,000, and 8,000 U lysozyme. Results revealed that, lysozyme addition had a significant effect on pH after 24 h of incubation, with the highest pH (p<0.01) observed in 8,000 U lysozyme, followed by the 4,000 U, 2,000 U, and without lysozyme. The highest amounts of acetic acid, propionic acid (p<0.01) and total volatile fatty acid (TVFA) (p<0.05) were found in 8,000 U after 24 h of incubation. The $CH_4$ concentration was the lowest in the 8,000 U and the highest in the without lysozyme addition after 24 h of incubation. There was no significant differences in general bacteria, methanogen, or protozoan DNA copy number. So far, addition of lysozyme increased the acetate, propionate, TVFA, and decreased $CH_4$ concentration. These results suggest that lysozyme supplementation may improve in vitro rumen fermentation and reduce $CH_4$ emission.
Biswas, M.,Biswas, K.,Ghosh, A.K.,Haldar, P.K. Kyung Hee Oriental Medicine Research Center 2009 Oriental pharmacy and experimental medicine Vol.9 No.4
In present study evaluate the analgesic and anti-inflammatory activity of the compound obtained from the petroleum ether (40 - 60$^{\circ}C$) extract of the fruits from Dregea volubilis in Swiss albino mice and in Wister albino rats respectively. Dried and crushed fruits of Dregea volubilis were extracted by petroleum ether (40 - 60$^{\circ}C$), the proper solvent system was developed by TLC and subjected to column chromatography for obtaining the pure compound/s. IR, MASS, NMR (PMR, C13 NMR and DEPT) spectroscopic analysis were done to elucidate the structure of the compound/s. The petroleum ether (40 - 60$^{\circ}C$) extract of the fruits of Dregea volubilis led to isolation of a pentacyclic triterpenoid designated as taraxerone and characterized as D- friedoolean- 14- en, 3 one. Taraxerone had been screened for analgesic activity in Swiss albino mice and anti-inflammatory activity in Wister albino rats at the dose of 5 mg/kg body weight orally and exhibit significant analgesic and anti-inflammatory properties.
Biswas, Tanmay The Kangwon-Kyungki Mathematical Society 2018 한국수학논문집 Vol.26 No.1
The main aim of this paper is to prove some results related to the growth rates of composite entire and meromorphic functions on the basis of their relative (p, q)-th order, relative (p, q)-th lower order, relative (p, q)-th type and relative (p, q)-th weak type where p and q are any two positive integers.
Thermal Evolution of BaO-CuO Flux as Sintering Aid for Proton Conducting Ceramic Fuel Cells
Biswas, Mridula,Hong, Jongsup,Kim, Hyoungchul,Son, Ji-Won,Lee, Jong-Ho,Kim, Byung-Kook,Lee, Hae-Weon,Yoon, Kyung Joong The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.5
The eutectic melt of BaO-CuO flux is known to be a potential sintering aid for $Ba(Zr,Y)O_3$ (BZY) electrolyte for proton-conducting ceramic fuel cells (PCFCs). A density of BZY higher than 97% of theoretical density can be achieved via sintering at $1300^{\circ}C$ for 2 h using a flux composed of 28 mol% BaO and 72 mol% CuO. In the present study, chemical and structural evolution of BaO-CuO flux throughout the sintering process was investigated. An intermediate holding step at $1100^{\circ}C$ leads to formation of various impurity compounds such as $BaCuO_{1.977}$, $Ba_{0.92}Cu_{1.06}O_{2.28}$ and $Cu_{16}O_{14.15}$, which exhibit significantly larger unit cell volumes than the matrix. The presence of such secondary compounds with large lattice mismatch can potentially lead to mechanical failure. On the other hand, direct heating to the final sintering temperature produced CuO and $Cu_2O$ as secondary phases, whose unit cell volumes are close to that of the matrix. Therefore, the final composition of the flux is strongly affected by the thermal history, and a proper sintering schedule should be used to obtain the desired properties of the final product.
Biswas Rathindra Nath,Islam Md. Nazrul,Mia Md. Juel,Islam M. Nazrul 대한공간정보학회 2020 Spatial Information Research Vol.28 No.5
This paper tries to explore the spatial patterns of lightning disaster death susceptibility in Bangladesh. It is prior need to identify the factors of death due to lightning hazard, seasonal variability, and spatial risks to develop management strategies of this country. To reach the study goal, lightning fatalities data were collected from the Ministry of Disaster Management and Relief, Bangladesh. The geostatistical IDW model of GIS technology was applied to assess the spatial vulnerability of lightning disaster. The geospatial prediction maps produced from the study determines the spatial heterogeneity of lightning risk. Generated statistics demonstrates that the Surma Basin, northwest Brinda tract, and northern Tertiary hilly region of Bangladesh are more susceptible to lightning disaster during the time span 2015–2018. Analysis results also discloses numerous factors such as climatic variability, geomorphological diverseness and anthropogenic phenomena influencing lightning catastrophes. Moreover, this study suggests that government and non-government disaster management organizations can play vital role to take initiative in risk assess, policy creation review, awareness building and campaign, community-based early warning system, emergency management system and appropriate technology piloting as well as implementation. The rationale of this study will contribute to assess spatial lightning strikes, mitigate locational vulnerability and promote sustainable development plans for reducing lightning disaster risk. In the future, GIS-based communication model like this can applied to raise awareness and educating and engaging the public through public–private partnership of the lightning hot spot regions.
Biswas, Ritam The Kangwon-Kyungki Mathematical Society 2018 한국수학논문집 Vol.26 No.4
In this paper the growth properties of the composition of integer translated entire and meromorphic functions in terms of their (p, q)-th order are discussed and based upon that some new results are developed.
Biswas, S.K.,Baeg, J.O. Pergamon Press ; Elsevier Science Ltd 2013 International journal of hydrogen energy Vol.38 No.34
Herein, we report the preparation, characterization and investigation of previously unexplored W incorporated iron vanadate (FeVO<SUB>4</SUB>) electrodes for solar light driven water oxidation in photoelectrochemical cell. The W incorporated FeVO<SUB>4</SUB> films on F-doped SnO<SUB>2</SUB> substrates have been prepared by layer-by-layer deposition of metal-organic precursor and subsequent thermal decomposition at 550 <SUP>o</SUP>C in air. The synthesized films with a band gap of about 2.06 eV are responsive to visible light up to wavelength of ~600 nm, i.e. being able to harvest ~45% of the solar spectrum. The W incorporated FeVO<SUB>4</SUB> photoanodes are active materials for photoelectrochemical water oxidation and, yield a significantly enhanced (2.5 fold higher) photocurrent in comparison to pristine FeVO<SUB>4</SUB> photoanodes. This improvement can be attributed to increased n-type conductivity by W<SUP>6+</SUP> ion doping in the FeVO<SUB>4</SUB> lattice. The incident photon to current conversion efficiency achieved with developed photoanodes is as high as 6.5% at 400 nm.