410 research outputs found
Non-linear charge reduction effect in strongly-coupled plasmas
No full textThe charge reduction effect, produced by the nonlinear Debye screening of high-Z charges occuring in strongly-coupled plasmas, is investigated. An analytic asymptotic expression is obtained for the charge reduction factor which determines the Debye-Hueckel potential generated by a charged test particle. Its relevant parametric dependencies are analyzed and shown to predict a strong charge reduction effect in strongly-coupled plasmas
Isolation and Identification of a Biologically Active Isoflavonoid from Cudrania javanensis
No full text SUMMARYIsolation of isoflavonoids has become a frequent endeavor, due to their interesting biological activities. Osajin, 1 ({5-hydroxy-3-(3-hydroxyphenyl)-8,8 dimethyl-6-(3-methylbut-2-enyl)-4H.8H-pyrano[2,3-h]chromen-4-one]} is a naturally occurring isoflavonoid which was isolated from the fruits of Cudrania javanensis1, 2. The structure was elucidated using spectroscopic methods, including NMR, IR, and MS.Key words: Cudrania javanensis, Moraceae, Isoflavonoids, Osajin G. K. Sarmah and R. K. Sharma. Isolation and Identification of a Biologically Active Isoflavonoid from Cudrania javanensis. J Phytol 2/5 (2010) 47-49.*Corresponding Author, Email: [email protected]
Fokker-Planck Kinetic Description of Small-scale Fluid Turbulencefor Classical Incompressible Fluids
No full textExtending the statistical approach proposed in a parallel paper Tessarotto2008-aa, purpose of this work is to propose a stochastic inverse kinetic theory for small-scale hydrodynamic turbulence based on the introduction of a suitable local phase-space probability density function (pdf). In particular, we pose the problem of the construction of Fokker-Planck kinetic models of hydrodynamic turbulence. The approach here adopted is based on the so-called IKT approach (inverse kinetic theory), developed by Tessarotto et al. (2004-2008) which permits an exact phase-space description of incompressible fluids based on the adoption of a local pdf. We intend to show that for prescribed models of stochasticity the present approach permits to determine uniquely the time evolution of the stochastic fluid fields. The stochastic-averaged local pdf is shown to obey a kinetic equation which, although generally non-Markovian, locally in velocity-space can be approximated by means of a suitable Fokker-planck kinetic equation. As a side result, the same pdf is proven to have generally a non-Gaussian behavior
Effect of Environmental Factors on Photovoltaic Soiling: Experimental and Statistical Analysis
No full textSoiling significantly impacts PV systems’ performance, but this can be mitigated through optimized frequency and timing of cleaning. This experimental study focused on the conditions leading to soiling. It utilized a novel method to evaluate the effectiveness of different cleaning frequencies. The transmittance of horizontally mounted glass coupons exposed outdoors in a warm and humid location was measured weekly and these measurements were used (i) to evaluate the variability of soiling and its seasonal correlations with environmental factors using linear regression models and (ii) to assess the effectiveness of the different cleaning cycles using statistical (F- and t-test) analysis. The minimum transmittance loss occurred during the season with the most frequent rainfall, which acted as the dominant natural cleaning agent. The experimental campaign showed that rainfalls do not completely clean soiling; a minimum intensity threshold has to be achieved to have a cleaning effect. The threshold rainfall was the highest for the weekly cleaned glass coupon and lowest for a coupon that was never cleaned. Based on the statistical analysis, it is suggested that weekly cleanings during winter and post-monsoon seasons and monthly cleanings during pre-monsoon and southwest monsoon seasons are optimal for areas in the Köppen–Geiger Cwa climate classification category. The correlation between soiling and environmental parameters was found to be highly dependent on the season. It may therefore not be possible to develop a simple, universal predictive relationship for soiling losses. The presented methodology is applicable to additional locations, even outside of the study area of India, to contribute to the understanding and mitigation of soiling
Compulsory licenses in the pharmaceutical industry: Pricing and R&D strategies
No full textA pharma manufacturer enters a developing country with a new drug after investing some R&D in the first period. The firm can be subjected to a compulsory license mechanism that allows a generic manufacturer to produce an imitated version of the patented product in exchange of a fixed royalty. When the patent expires, a traditional price competition ensues between the patent-holder and the generic manufacturer. We compare two deterministic scenarios wherein the patent-holder has full information regarding the compulsory license. We identify the conditions under which the license is socially and economically beneficial. Our analyses suggest that the patent-holder is seldom economically better-off. We next model a stochastic compulsory license decision rule whereby the patent-holder is exposed to a certain probability that the compulsory license is issued. We show that uncertainty renders the patent-holder more willing to operate in that market
Sattriya-08 Double Handed Mudra’s Dataset
No full textSattriya_08_Mudra’s Dataset & Name Table With meaning and usage.Contributors:Chayanika SarmahParismita SarmaDescriptionThere is a double handed digital image dataset of “Sattriya Dance” mostly practiced in Assam. Contributors have uploaded all the images under the main folder "Sattriya-08 Double Handed Mudra’s Dataset". Double handed mudra dataset consists of eight (08) double handed mudras of Sattriya dance (Classical dance from Assam). Inside the main folder other eight sub folders are created with the names of the eight mudras whose image samples are uploaded here. Each of these eight sub folders have three sub-sub folders with titles " Front_view”, “Left_view” and “Right_view”. The sub-sub folders depict front, left and right views of all the recorded mudras. All the samples are collected by visiting few prominent Sattriya Dance academy situated in Guwahati. 5 to 10 seconds duration videos were recorded for all the mudras at least from 50 dancers on a coloured background (afterwards background was removed). Video recording was performed using a DSLR Canon Camera (EOS 1200 D). Individual video was converted into image frames and thus were able to get around 2400.png image frames. Some still images are also captured using the same DSLR Canon Camera (EOS 1200 D). The names and meaning of each Mudra were confirmed after a discussion with a Sattriya dance experts from Guwahati, Assam, India.The usage of these data sets are1.Developing algorithm for automatic recognition of Mudras.2.Developing technique for tracking and analyzing the temporal evolution of Mudras in a dance performance
Women in politics in Australia
No full textIt is a real puzzle as to why women are not more conspicuous on the Australian political landscape. There are good reasons why women’s presence should be more obvious. South Australian women (with the exception of indigenous Australians) gained the right to vote in 1894 and the rest of the country’s women gained this right by 1902. Indigenous Australians were granted suffrage in 1962. Edith Cowan was the first woman elected to a state Legislative Assembly in 1921. In 1943 Enid Lyons and Dorothy Tangney made history in being elected to Australia’s national parliament. Reasons for why so few women were active in political life in this era include “the difficulties of combining the roles of wife, mother and housekeeper with public, political life, and the fears of the parties that the electorate would not generally accept women candidates” (Clarke and White 1983, 311).Has much changed
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