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Suppression of Stimulated Raman Scattering of a Laser in a Rippled Density Plasma
Vishwa Bandhu Patbak,V. K. Tripathi 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
The effect of a stationary electron density ripple on stimulated Raman scattering (SRS) of a laser in a plasma is studied. The density ripple couples with the primary Langmuir wave, generated in the Raman process, to produce a secondary Langmuir wave of larger wave number that is strongly Landau damped on the electrons. As a consequence the growth rate of the Raman process is suppressed. In a special case of density ripple produced by two counter propagating lasers of intensity ~10^15 W/cm^2 at 1 ㎛ wavelength in a 6 % critical density plasma of 1 keV temperature, the reduction in growth rate is suvstantial. The effect of density ripple wavelength on SRS is studied at different plasma temperatures. Upto ~70 % suppression in SRS is ovserved for different plasma temperatures t different rippls w avelengths, however, for higher temperatures we also get ~10 % of suppression for the other ripple wavelength values.
Is Capital flow in India expansionary or contractionary?
Sayantan Bandhu Majumder 중앙대학교 경제연구소 2021 Journal of Economic Development Vol.46 No.4
The standard model of open economy macroeconomics suggests that the capital inflow hurts the export of the country through the appreciation pressure. On the other hand, there is a vigorous belief that the capital inflow into the developing countries helps to mitigate the saving-investment gap, encourage the technology transfer, fuel the credit boom, liquidates the stock market and thereby finally increases the output. This paper aims to investigate whether the capital inflow in India is expansionary or contractionary. In doing so, we focus on the different typologies of capital inflow, components of GDP and the absorption capacity of the domestic economy. The empirical strategy adopted by the paper takes care of the issue of the non-linearity and also the endogeneity problem. Analysing the data from 1996 Q2 to 2019 Q4 we find that the capital flow into India could be expansionary as well as contractionary depending upon the nature of inflow and the absorption capacity. Net total capital inflow has no direct impact on growth. But it can accelerate the growth in conjunction with the higher financial depth of the economy, negative output gap, lower country risk and better stock market condition.
Din Bandhu,Ashish Thakur,Rajesh Purohit,Rajesh Kumar Verma,Kumar Abhishek 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
Aluminium has a massive demand in the areas of automobile, aerospace and diverse engineering applications in order to furnish the requirement in those fields. But this technological evolution needs something more than aluminium. Materialogists are struggling hard to find out a material which owns sound mechanical and thermal properties and also superior than aluminium in each extent. Metal matrix composite (MMC) is a solution. Generally, metal matrix composites contain a low density material, i.e. aluminium or magnesium, reinforced with fibers or particulate of a ceramic material, i.e. silicon carbide or graphite. They show greater specific strength, high stiffness, elevated operating temperature, and superior wear resistance, along with the possibility to customize these properties for a specific use. In this study, Al 7075 is taken as a base matrix material, whereas ceramic materials like SiC, Al 2 O 3 , B 4 C and TiB 2 are used as reinforcements. There are different methods available for fabricating metal matrix composite materials and in this work, stir casting technique, which is a liquid state process, is used. Four different MMC specimens were produced with 15 % SiC, 15 % Al 2 O 3 , 15 % B 4 C and 15 % TiB 2 . Mechanical properties i.e. tensile strength, hardness, and impact strength were studied for the prepared specimens. The results were charted and presented graphically to describe these materials characteristics.
Institutions Determine Debt–Growth Relationship: Evidence from Fourth Wave of Debt in EMDEs
Bagchi Sagnik,Bandhu Majumder Sayantan,Banerjee Somdutta 한국국제경제학회 2023 International Economic Journal Vol.37 No.2
The last decade witnessed global debt levels to reach record high. In Emerging Market and Developing Economies (EMDEs) like never before, the (public and private) debt–GDP ratio has been dismally high. An upward spree of the debt–GDP ratio coupled with a loom- ing economic crisis led to concerns about institutional qualities (IQ). We explore how different dimensions of IQ (namely, political, legal and governance) impact the debt–growth relationship in the EMDEs amidst the current fourth wave of debt (2010–2019). We examine whether the relation is monotonic or it varies around a particular threshold value of IQ. By applying a dynamic panel threshold regression model, we obtain two regime-dependent marginal effects of regressors (upper and lower regimes) that are distinguished by a threshold value of IQ. Our results reveal that for each of our considered IQ, there exists a statistically significant threshold value. For public debt, across all dimensions of IQ debt hurts growth in the lower regime, while in the upper regime the association is favourable. While private debt is growth enhancing in the lower regime of all IQs (excepting corruption), while it is inimical in the upper regime.
Studies on Determination of Larval Critical Weight in Silkworm, Bombyx mori L.-An Index of Quality
( Atul Kumar Saha ),( Anath Bandhu Chaudhuri ),( S Monthira Moorthy ),( Subrata Roy ) 한국잠사학회 2009 International Journal of Industrial Entomology Vol.19 No.2
The Larval critical weight is the minimal mass at which further growth in not necessary for a normal time course to pupation. Larval critical weight (Lcw), pupal critical weight (Pcw) and adult critical weight (Acw) of different breeds of Bombyx mori L. were determined through starvation (food deprivation). The Lcw was found to be about 938.46, 2397.26, 2283.57 and 2220.97 mg in males and 1118.15, 2681.04, 2604.9 and 2455.88 mg in females of the multivoltine breed (Nistari), Bivoltine breeds (P5&NB18) and their hybrid (P5×NB18) respectively. Bivoltine breed P5 took more time (3.35 days) followed by NB18 (3.13 days)&P5×NB18 (3.02 days) to attain larval critical weight (In 5th Instar) than the multivoltine breed Nistari (2.42 days). Decrease in weight from larval maximal weight to pupal weight and to adult weight was also observed more in multivoltine than bivoltines, which may be due to more latent feeding period in bivoltines. Since Lcw is a stable character and independent of environment, it could be utilized for characterization of silkworm breeds to assess the quality of an insect.
Studies on Determination of Larval Critical Weight in Silkworm, Bombyx mori L. - An Index of Quality
Saha, Atul Kumar,Chaudhuri, Anath Bandhu,Moorthy, S Monthira,Roy, Subrata Korean Society of Sericultural Science 2009 International Journal of Industrial Entomology Vol.19 No.2
The Larval critical weight is the minimal mass at which further growth in not necessary for a normal time course to pupation. Larval critical weight (Lcw), pupal critical weight (Pcw) and adult critical weight (Acw) of different breeds of Bombyx mori L. were determined through starvation (food deprivation). The Lcw was found to be about 938.46, 2397.26, 2283.57 and 2220.97 mg in males and 1118.15, 2681.04, 2604.9 and 2455.88 mg in females of the multivoltine breed (Nistari), Bivoltine breeds (P5 & NB18) and their hybrid (P5$\times$NB18) respectively. Bivoltine breed P5 took more time (3.35 days) followed by NB18 (3.13 days) & P5$\times$NB18 (3.02 days) to attain larval critical weight (In $5^{th}$ Instar) than the multivoltine breed Nistari (2.42 days). Decrease in weight from larval maximal weight to pupal weight and to adult weight was also observed more in multivoltine than bivoltines, which may be due to more latent feeding period in bivoltines. Since Lcw is a stable character and independent of environment, it could be utilized for characterization of silkworm breeds to assess the quality of an insect.