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NOTE ON SOME CHARACTER FORMULAS
( Mahendra Pal Chaudhary ),( Sangeeta Chaudhary ),( Junesang Choi ) 호남수학회 2016 호남수학학술지 Vol.38 No.4
Chaudhary and Choi [7] presented 14 identities which reveal certain interesting interrelations among character formulas, combinatorial partition identities and continued partition identities. In this sequel, we aim to give slightly modified versions for 8 iden- tities which are chosen among the above-mentioned 14 formulas.
NOTE ON SOME CHARACTER FORMULAS
Chaudhary, Mahendra Pal,Chaudhary, Sangeeta,Choi, Junesang The Honam Mathematical Society 2016 호남수학학술지 Vol.38 No.4
Chaudhary and Choi [7] presented 14 identities which reveal certain interesting interrelations among character formulas, combinatorial partition identities and continued partition identities. In this sequel, we aim to give slightly modified versions for 8 identities which are chosen among the above-mentioned 14 formulas.
NOTE ON Q-PRODUCT IDENTITIES AND COMBINATORIAL PARTITION IDENTITIES
Chaudhary, M.P.,Salilew, Getachew Abiye The Honam Mathematical Society 2017 호남수학학술지 Vol.39 No.2
The objective of this note is to establish three results between q-products and combinatorial partition identities in a elementary way. Several closely related q-product identities such as (for example)continued fraction identities and Jacobis triple product identities are also considered.
Influences of Different Halophyte Vegetation on Soil Microbial Community at Temperate Salt Marsh
Chaudhary, Doongar R.,Kim, Jinhyun,Kang, Hojeong Springer-Verlag 2018 Microbial ecology Vol.75 No.3
<P>Salt marshes are transitional zone between terrestrial and aquatic ecosystems, occupied mainly by halophytic vegetation which provides numerous ecological services to coastal ecosystem. Halophyte-associated microbial community plays an important role in the adaptation of plants to adverse condition and also affected habitat characteristics. To explore the relationship between halophytes and soil microbial community, we studied the soil enzyme activities, soil microbial community structure, and functional gene abundance in halophytes- (Carex scabrifolia, Phragmites australis, and Suaeda japonica) covered and un-vegetated (mud flat) soils at Suncheon Bay, South Korea. Higher concentrations of total, Gram-positive, Gram-negative, total bacterial, and actinomycetes PLFAs (phospholipid fatty acids) were observed in the soil underneath the halophytes compared with mud flat soil and were highest in Carex soil. Halophyte-covered soils had different microbial community composition due to higher abundance of Gram-negative bacteria than mud flat soil. Similar to PLFA concentrations, the increased activities of beta-glucosidase, cellulase, phosphatase, and sulfatase enzymes were observed under halophyte soil compared to mud flat soil and Carex exhibited highest activities. The abundance of archaeal 16S rRNA, fungal ITS, and denitrifying genes (nirK, nirS, and nosZ) were not influenced by the halophytes. Abundance bacterial 16S rRNA and dissimilatory (bi)sulfite (dsrA) genes were highest in Carex-covered soil. The abundance of functional genes involved in methane cycle (mcrA and pmoA) was not affected by the halophytes. However, the ratios of mcrA/pmoA and mcrA/dsrA increased in halophyte-covered soils which indicate higher methanogenesis activities. The finding of the study also suggests that halophytes had increased the microbial and enzyme activities, and played a pivotal role in shaping microbial community structure.</P>
Chaudhary, Girdhari,Jeong, Yongchae THE INSTITUTE OF ELECTRICAL ENGINEERS 2017 IEEE Microwave and Wireless Components Letters Vol. No.
<P>In this letter, the analytical design method of a reflection-type coupled line all-pass circuit with arbitrary predefined wideband flat group delay (GD) is presented. The proposed circuit consists of 90 degrees hybrid and coupled lines with a short-circuited load. The proposed structure is simple and does not require any iterative process to obtain optimum circuit parameters. Theoretical and experimental results are provided for validation of the proposed structure. The prototype circuits were fabricated at a center frequency of 2.5 GHz with 2 and 4 ns flat GD responses. The measurement results agreed well with the simulation and theoretical predicted results.</P>
Biofilter in Water and Wastewater Treatment
Chaudhary, Durgananda Singh,Vigneswaran, Saravanamuthu,Ngo, Huu-Hao,Shim, Wang Geun,Moon, Hee 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.6
Biofilter is one of the most important separation processes that can he employed to remove organic pollutants from air, water, and wastewater. Even though, it has been used over a century, it is still difficult to explain thmtically all the biological processes occurring in a hiofilter. In this paper, the fundamental of biological processes involved in the hiofilter is critically reviewed together with the mathematical modeling approach. The important operating and design parameters are discussed in detail with the typical values used for different applications. The most important parameter which governs this pmes is the biomass attached to the medium. The relative merits of Merent methods adopted in the measurement of the hiomass are discussed. The laboratory-and full-scale applications of the biofilter in water and wastewater treatment ax also presented. Their performances in terms of specific pollutant removal are highlighted.
Chaudhary, Dhanjee Kumar,Bhattacherjee, Ashis,Patra, Aditya Kumar,Chau, Nearkasen Occupational Safety and Health Research Institute 2015 Safety and health at work Vol.6 No.4
Background: This study aimed to assess the whole-body vibration (WBV) exposure among large blast hole drill machine operators with regard to the International Organization for Standardization (ISO) recommended threshold values and its association with machine- and rock-related factors and workers' individual characteristics. Methods: The study population included 28 drill machine operators who had worked in four opencast iron ore mines in eastern India. The study protocol comprised the following: measurements of WBV exposure [frequency weighted root mean square (RMS) acceleration ($m/s^2$)], machine-related data (manufacturer of machine, age of machine, seat height, thickness, and rest height) collected from mine management offices, measurements of rock hardness, uniaxial compressive strength and density, and workers' characteristics via face-to-face interviews. Results: More than 90% of the operators were exposed to a higher level WBV than the ISO upper limit and only 3.6% between the lower and upper limits, mainly in the vertical axis. Bivariate correlations revealed that potential predictors of total WBV exposure were: machine manufacturer (r = 0.453, p = 0.015), age of drill (r = 0.533, p = 0.003), and hardness of rock (r = 0.561, p = 0.002). The stepwise multiple regression model revealed that the potential predictors are age of operator (regression coefficient ${\beta}=-0.052$, standard error SE = 0.023), manufacturer (${\beta}=1.093$, SE = 0.227), rock hardness (${\beta}=0.045$, SE = 0.018), uniaxial compressive strength (${\beta}=0.027$, SE = 0.009), and density (${\beta}=-1.135$, SE = 0.235). Conclusion: Prevention should include using appropriate machines to handle rock hardness, rock uniaxial compressive strength and density, and seat improvement using ergonomic approaches such as including a suspension system.