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Review of regenerator materials applicable for miniature Stirling cryocoolers
Kishor Kumar V. V. 대한설비공학회 2021 International Journal Of Air-Conditioning and Refr Vol.29 No.4
Miniature Stirling coolers are preferred to provide cryogenic cooling for Infra-Red (IR) sensors used for communication, military and space applications. They provide 0.25-1.5 W of cooling effect at 80 K. Miniature Stirling coolers used for space applications are time tested, reliable and have the maximum COP compared to other types of coolers. Helium is used as the working fluid because of its low boiling point, high thermal conductivity, high ratio of specific heats and inert gas properties.A regenerator is the primary heat exchanger in the system which periodically exchanges heat with the cold and hot gases passing through the regenerator material. The effectiveness of the regenerator is the most important parameter influencing the cooling effect produced by the system. For the optimum performance of the cryocooler, the regenerator should have maximum heat transfer area, minimum void volume, minimum pressure drop, large heat capacity ratio between matrix material and gas and minimum longitudinal conduction. Since some of these requirements are conflicting in nature, the design of the regenerator becomes a challenge in the overall design of the cooler. A state of the art review of regenerator materials, design and operation are presented in this paper. The different sources of regenerator losses and the issues related to regenerator design and optimization are discussed in detail. Results of various experimental and numerical investigations conducted on Stirling regenerator are discussed and the recent developments in material selection and design are highlighted.
Genome of Escherichia coli KCTC 72668 isolated from rectum of companion dog
Kishor Sureshbhai Patil,이해성,김현빈,이승제,채종찬 한국미생물학회 2019 미생물학회지 Vol.55 No.4
Escherichia coli KCTC 72668 was isolated from rectum of companion dog. The draft genome of strain KCTC 72668 comprised of 5,215,239 bp with a G + C content of 50.7% which contained 5,688 predicted coding DNA sequences (CDS), 87 tRNA genes, and 22 rRNA genes. And the genome harbored two antibiotic resistance genes, ampC and bacA, corresponding to resistances against beta-lactam and bacitracin.
KISHOR R. GAIKWAD,YOGESH U. NANER 한국산업응용수학회 2021 Journal of the Korean Society for Industrial and A Vol.25 No.1
A Green’s function approach is adopted to solve the two-dimensional thermoelastic problem of a thin hollow circular disk. Initially, the disk is kept at temperature T0(r, z). For times t > 0, the inner and outer circular edges are thermally insulated and the upper and lower surfaces of the disk are subjected to convection heat transfer with convection coefficient hc and fluid temperature T∞, while the disk is also subjected to the axisymmetric heat source. As a special case, different metallic disks have been considered. The results for temperature and thermal deflection has been computed numerically and illustrated graphically.
KISHOR R. GAIKWAD,VIDHYA G. BHANDWALKAR 한국산업응용수학회 2021 Journal of the Korean Society for Industrial and A Vol.25 No.3
The problem of generalized thermoelasticity of two-temperature for finite piezoelectric rod will be modified by applying three different types of heating applications namely, thermal shock, ramp-type heating and harmonically vary heating. The solutions will be derived with direct approach by the application of Laplace transform and the Caputo-Fabrizio fractional order derivative. The inverse Laplace transforms are numerically evaluated with the help of a method formulated on Fourier series expansion. The results obtained for the conductive temperature, the dynamical temperature, the displacement, the stress and the strain distributions have represented graphically using MATLAB.
Global Existence and Ulam–Hyers Stability of Ψ–Hilfer Fractional Differential Equations
Kishor Deoman Kucche,Jyoti Pramod Kharade 경북대학교 자연과학대학 수학과 2020 Kyungpook mathematical journal Vol.60 No.3
In this paper, we consider the Cauchy-type problem for a nonlinear differential equation involving a Ψ-Hilfer fractional derivative and prove the existence and uniqueness of solutions in the weighted space of functions. The Ulam–Hyers and Ulam–Hyers–Rassias stabilities of the Cauchy–type problem is investigated via the successive approximation method. Further, we investigate the dependence of solutions on the initial conditions and their uniqueness using ε- approximated solutions. Finally, we present examples to illustrate our main results.
Hardcore Smoking in Three South-East Asian Countries: Results from the Global Adult Tobacco Survey
Kishore, Jugal,Jena, Pratap Kumar,Bandyopadhyay, Chandan,Swain, Monali,Das, Sagarika,Banerjee, Indrani Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.2
Background: Hardcore smoking is represented by a subset of daily smokers with high nicotine dependence, inability to quit and unwillingness to quit. Estimating the related burden could help us in identifying a high risk population prone to tobacco induced diseases and improve cessation planning for them. This study assessed the prevalence and associated factors of hardcore smoking in three South-East Asian countries and discussed its implication for smoking cessation intervention in this region. Materials and Methods: Global Adult Tobacco Survey (GATS) data of India, Bangladesh and Thailand were analyzed to quantify the hardcore smoking prevalence in the region. On the basis of review, an operational definition of hardcore smoking was adopted that includes (1) current daily smoker, (2) no quit attempt in the past 12 months of survey or last quit attempt of less than 24 hours duration, (3) no intention to quit in next 12 months or not interested in quitting, (4) time to first smoke within 30 minutes of waking up, and (5) knowledge of smoking hazards. Logistic regression analysis was carried out using hardcore smoking status as response variable and gender, type of residence, occupation, education, wealth index and age-group as possible predictors. Results: There were 31.3 million hardcore smokers in the three Asian countries. The adult prevalence of hardcore smoking in these countries ranges between 3.1% in India to 6% in Thailand. These hardcore smokers constitute 18.3-29.7% of daily smokers. The logistic regression model indicated that age, gender, occupation and wealth index are the major predictors of hardcore smoking with varied influence across countries. Conclusions: Presence of a higher number of hardcore smoking populations in Asia is a major public health challenge for tobacco control and cancer prevention. There is need of intensive cessation interventions with due consideration of contextual predictors.
Kishore Kumar Sarkar,Trina Mitra,Rabindra Nath Acharyya,Samir Kumar Sadhu 경희대학교 융합한의과학연구소 2019 Oriental Pharmacy and Experimental Medicine Vol.19 No.1
The present study was designed to investigate different phytochemical groups present in ethanolic extract of Argemone mexicana aerial parts (EAMA) as well as to assess the analgesic, antidiarrheal, antibacterial, anthelmintic and cytotoxic activities of EAMA. Moreover, peripheral and central analgesic activities were evaluated by acetic acid-induced writhing test, formalin-induced paw licking test, tail immersion test and hot plate test. In vivo castor oil-induced diarrheal model and magnesium sulphate induced diarrheal model in mice were utilized for the assessment of antidiarrheal activity. Again, antibacterial activity was evaluated using disc diffusion assay. Anthelmintic activity was carried out on Paramphistomum cervi (Trematoda). Cytotoxic activity was assessed through brine shrimp lethality bioassay. The extract demonstrated the presence of alkaloids, flavonoids, phenolic compounds, tannins, glycosides and gums in phytochemical screening. In case of acetic acid-induced writhing and formalin induced paw licking test, both lower and higher doses of EAMA showed significant percentage inhibition of writhing as well as paw licking respectively (*P < 0.05, vs. control). EAMA at the doses of 200 mg/kg and 400 mg/kg revealed significant latency response (*P < 0.05, vs. control) in delayed phase in both tail immersion as well as hot plate test. Moreover, significant percentage inhibition (*P < 0.05, vs. control) of diarrhea was exposed by both doses of EAMA in in vivo diarrheal models. In disc diffusion assay, EAMA showed antibacterial activities against both gram positive and gram negative bacterial strains. Again, the extract exhibited anthelmintic and cytotoxic activity in a dose dependent manner.