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Comparative study on cracked beam with different types of cracks carrying moving mass
Shakti P. Jena,Dayal R. Parhi,Devasis Mishra 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.56 No.5
An analytical-computational method along with finite element analysis (FEA) has been employed to analyse the dynamic behaviour of deteriorated structures excited by time- varying mass. The present analysis is focused on the comparative study of a double cracked beam with inclined edge cracks and transverse open cracks subjected to traversing mass. The assumed computational method applied is the fourth order Runge-Kutta method. The analysis of the structure has been carried out at constant transit mass and speed. The response of the structure is determined at different crack depth and crack inclination angles. The influence of the parameters like crack depth and crack inclination angles are investigated on the dynamic behaviour of the structure. The results obtained from the assumed computational method are compared with those of the FEA for validation and found good agreements with FEA.
Biology of Bactrocera (Zeugodacus) tau (Walker) (Diptera: Tephritidae)
Shakti Kumar Singh,Dinesh KUMAR,Vilayanoor V. RAMAMURTHY 한국곤충학회 2010 Entomological Research Vol.40 No.5
The biology of the fruit fly Bactrocera tau, an important horticultural pest, was studied under laboratory conditions at 25°C and 60–70% relative humidity on Cucurbita maxima. The duration of mating averaged 408.03 ± 235.93 min. After mating, the female fly had a preoviposition period of 11.7 ± 4.49 days. The oviposition rate was 9.9 ± 8.50 eggs and fecundity was 464.6 ± 67.98 eggs/female. Eggs were elliptical, smooth and shiny white, turning darker as hatching approached, and measured 1.30 ± 0.07 mm × 0.24 ± 0.04 mm. The chorion has polygonal microsculpturing and is species-specific with polygonal walls. The egg period lasts for 1.3 ± 0.41 days. The duration of the larval period is 1.2 ± 0.42, 1.7 ± 0.48 and 4.0 ± 0.94 days for first, second and third instars, respectively. Pupation occurs in the sand or soil and pupal periods are 7.0 ± 0.47 days. The life cycle from egg to adult was completed in 14.2 ± 1.69 days; the longevity of mated females and males was 130.33 ± 14.18 and 104.66 ± 31.21 days, respectively. At least two to three generations were observed from June 2008 to June 2009.
Mechanical, Thermophysical, and Ultrasonic Properties of Thermoelectric HfX2 (X = S, Se) Compounds
Shakti Pratap Singh,Gaurav Singh,A. K. Verma,A. K. Jaiswal,R. R. Yadav 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
In the present study, ultrasonic and thermophysical behaviour of thermoelectric hexagonal structured HfX2(X = S, Se)compounds have been analysed by the theoretical evaluation of second and third order elastic constants (SOECs and TOECs)using many body interaction potential model. The computed SOECs have been used to determine the temperature dependentspecific heat, thermal energy density, elastic coupling constants, Grüneisen parameters, ultrasonic velocities, Debye averagevelocity, ultrasonic attenuation, and thermal relaxation time. We have observed that the temperature dependent ultrasonicattenuation and thermal relaxation time for HfX2are mainly affected by thermal conductivity. The elastic properties of thematerial are compared with existing data in literature for the validation of the work. The obtained values of elastic stiffnessare found very large in comparison to that of other material from transition metal dichalcogenides of group IVB indicatingbetter mechanical properties than the same group materials. Calculated elastic, thermal, and ultrasonic properties are correlatedfor better characterization of the materials which are useful for thermoelectric and energy transport applications.
Shakti Chandra Mondal,황수정(Su-Jung Hwang),은종방(Jong-Bang Eun) 한국차학회 2021 한국차학회지 Vol.27 No.1
방글라데시에서 차 음용은 인기를 얻고 있다. 방글라데시인들은 녹차, 홍차, 우롱차 등 다양한 종류의 차를 음용하고 있지만 그 중에서도 홍차가 가장 대중적인 인기를 끌고 있다. 차는 항산화, 항염증, 항당뇨, 항암 등건강에 좋은 다양한 화합물을 함유한다. 그러나 방글라데시 차 농장은 세계 최상급의 차를 생산하는 과정에 있어 몇 가지 문제에 직면하고 있다. 그중 주요한 문제는 정치적 불안, 인프라, 교육 및 사회 보장과 관련된 것이다. 차 생산 종사자들의 일상생활에도 미흡한 점이 많다. 따라서 본 논문에서는 방글라데시의 현재 차 생산 현황에대해 조사하고자 하였으며 또한 방글라데시에서 차를 생산하는 근로자들의 사회경제적 상황과 차 제조와 관련된 실질적인 문제들을 전반적으로 고찰하였다. Tea drinking is gaining popularity in Bangladesh. The people of this country drink all available types of tea such as green tea, black tea, and oolong tea. Among them, black tea is the most popular. Tea contains various compounds which are beneficial for health by virtue of their anti-oxidative, anti-inflammatory, anti-diabetic, anti-cancerous, and other properties. However, in Bangladesh, tea estates are facing several problems during the production of world-class tea. The main issues are related to political instability, infrastructure, education, and social security. The daily life of tea workers also leaves a lot to be desired. This study observed the present status of tea production in Bangladesh and attempted to outline the socio-economic conditions of the workers and practical problems related to tea production.
Mechanistic insights on burdock (Arctium lappa L.) extract effects on diabetes mellitus
Shakti Chandra Mondal,은종방 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.8
Diabetes mellitus (DM) type 2 is amongst the most common chronic diseases, being responsible for various problems in humans and contributing to increased mortality rates worldwide. Fructooligosaccharide, which can be produced from the roots of burdock (Arctium lappa L.), has been shown to have a wide range of pharmacological proprieties, including antiviral, anti-inflammatory, hypolipidemic, and antidiabetic effects. Moreover, burdock also contains chlorogenic acid, which has been used in traditional medicine as an antioxidant. Considering its natural origin and minimal toxicity, burdock fructooligosaccharides (BFO) has gained considerable attention from researchers owing its wide, efficient, and beneficial action against DM. Although the effectiveness of fructooligosaccharide and chlorogenic acid has been extensively discussed, limited information is available on the application of burdock for DM treatment. In this review, we discuss the beneficial contributions, and the recent in vitro and in vivo analytical findings on A. lappa extract as DM therapy.
Extraction of phenolic compounds from Burdock root waste using ultrasonication as a green technology
Shakti Chandra Mondal,Jong-Bang Eun 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Burdock (Arctium lappa L.) roots are using as traditional medicine due to high content of bioactive compounds and antioxidant properties. In this study, ultrasonic extraction parameters such as solid to water ratio (20-40 g/ml), sonication time (60-100 min), and sonication temperature (40-60°C) were optimized using response surface methodology (RSM). After multiple linear regression analysis, a second-order polynomial model was developed for each response (reducing sugar and total phenolic content). The total phenolic compound was extracted as 1.0 to 3.75 mg GAE/g. It was observed that, solid to water ratio and sonication temperature have significant effects (p<0.05) on the extraction of phenolic compounds. Optimum extraction condition was found to be solid/water ratio: 39.98 g/ml, sonication time: 72.86 min, and sonication temperature: 59.99 °C. Additionally, LC-MS analysis confirmed the presence of various phenolic compounds such as tannins, caffeic acid derivatives and chlorogenic acids.