Evaluation of rubber agroforests performances. The example of Lubuk Beringin (Jambi province, Indonesia)

The present study aims to demonstrate the thermoacoustic energy conversion phenomenon in a standing wave resonator driven by a commercial loudspeaker with a stack made of plastic straws and atmospheric air as the working fluid. The system is driven at resonance frequency of 70 Hz with the stack kept in the middle section of the resonator and a temperature difference of 14.1℃ was produced between the ends of the stack at a drive ratio of 3.57 %. The hot end reached a temperature of 36.5℃ and the cold end reached a temperature of 22.4℃ at the highest drive ratio. Moving the stack towards the end of the resonator reduces the temperature difference produced showing the influence of stack position. Thermoacoustic devices offer an environment-friendly solution to utilize waste heat or renewable energy sources, to upgrade low grade heat or generate cooling or produce electricity using acoustic-electric transducers. This study is done as a pre-cursor, to develop a relatively inexpensive prototype for studying non-linear effects at high drive ratios seen in thermoacoustic devices, which are known to reduce their performance.NRF (Natl Research Foundation, S’pore)MOE (Min. of Education, S’pore)Published versio

MECHANICAL PROPERTIES OF SISAL/GLASS FIBER REINFORCED HYBRID COMPOSITES: A REVIEW

The natural fiber-reinforced polymer composite is swiftly growing both in phrases of their industrial applications and fundamental research. They are renewable, cheap, absolutely or in part recyclable and biodegradable. The incorporation of herbal fibers consisting of sisal with glass fiber hybrid composites has additionally received growing industrial packages. Herbal and synthetic fibers are mixed in the same matrix (unsaturated polyester) to make sisal/glass fiber hybrid composites and the mechanical residences of those hybrid composites had been studied. A giant development in mechanical homes of sisal/glass fiber hybrid composites has been observed. the chalk powder (additive) is likewise introduced to the resin (unsaturated polyester) in proportions of 1%, 2%, 3% by way of weight of resin respectively and sisal/glass fiber hybrid composites were organized through the usage of this resin to take a look at the effect of chalk powder on mechanical homes of those hybrid composites. It is also found that because the chalk powder quantity increases tensile and flexural residences are decreases

Comparison of exact solution with Eikonal approximation for elastic heavy ion scattering

A first-order optical potential is used to calculate the total and absorption cross sections for nucleus-nucleus scattering. The differential cross section is calculated by using a partial-wave expansion of the Lippmann-Schwinger equation in momentum space. The results are compared with solutions in the Eikonal approximation for the equivalent potential and with experimental data in the energy range from 25A to 1000A MeV

SPRING-INX: A Multilingual Indian Language Speech Corpus by SPRING Lab, IIT Madras

India is home to a multitude of languages of which 22 languages are recognised by the Indian Constitution as official. Building speech based applications for the Indian population is a difficult problem owing to limited data and the number of languages and accents to accommodate. To encourage the language technology community to build speech based applications in Indian languages, we are open sourcing SPRING-INX data which has about 2000 hours of legally sourced and manually transcribed speech data for ASR system building in Assamese, Bengali, Gujarati, Hindi, Kannada, Malayalam, Marathi, Odia, Punjabi and Tamil. This endeavor is by SPRING Lab , Indian Institute of Technology Madras and is a part of National Language Translation Mission (NLTM), funded by the Indian Ministry of Electronics and Information Technology (MeitY), Government of India. We describe the data collection and data cleaning process along with the data statistics in this paper.Comment: 3 pages, About SPRING-INX Dat

Mapping local patterns of childhood overweight and wasting in low- and middle-income countries between 2000 and 2017

A double burden of malnutrition occurs when individuals, household members or communities experience both undernutrition and overweight. Here, we show geospatial estimates of overweight and wasting prevalence among children under 5 years of age in 105 low- and middle-income countries (LMICs) from 2000 to 2017 and aggregate these to policy-relevant administrative units. Wasting decreased overall across LMICs between 2000 and 2017, from 8.4% (62.3 (55.1–70.8) million) to 6.4% (58.3 (47.6–70.7) million), but is predicted to remain above the World Health Organization’s Global Nutrition Target of <5% in over half of LMICs by 2025. Prevalence of overweight increased from 5.2% (30 (22.8–38.5) million) in 2000 to 6.0% (55.5 (44.8–67.9) million) children aged under 5 years in 2017. Areas most affected by double burden of malnutrition were located in Indonesia, Thailand, southeastern China, Botswana, Cameroon and central Nigeria. Our estimates provide a new perspective to researchers, policy makers and public health agencies in their efforts to address this global childhood syndemic

Conclusion: cosmopolitan or cosmopolitan-minded militaries?

International audienc

The initiation of coronal mass ejections by magnetic flux emergence

Aims. The initiation of solar Coronal Mass Ejections (CMEs) is studied in the framework of computational Magneto- Hydro-Dynamics (MHD).status: publishe

Lattice imaging studies on structure and disorder in SiC polytypes

Crystal structure of a large period polytype as well as some complex polytypes like 40H, 150R, and their intergrowth structures have been determined on the basis of one dimensional lattice images and confirmed finally by establishing a match between observed and calculated X-ray intensities. Tilted beam two dimensional lattice images using selected reflections to produce chevron shaped fringes (by deriving first the imaging conditions in case of a simple structure 6H) simulating layer stacking sequence have been used to determine the structure of a new large period polytype 411R and its intergrowth structures. Critical evaluation of these techniques for structure determination has been discussed. A notable feature emerging from the lattice imaging studies is the existence of intergrowth structures causing the formation of superperiod structures (> 100 nm). Finally in this study the origin of one dimensional disorder was found as a result of either due to large periodicities or due to non-random disorder and in very few cases due to random disorder.On a déterminé la structure cristalline d'un polytype de grande période et celles de polytypes complexes tels que 40H et 150R, ainsi que leurs structures d' intercroissance, au moyen d'images de réseau à une dimension, et par corrélation des intensités observées et calculées de diffraction de rayons X. Afin de déterminer la structure d'un nouveau polytype à grande période 411R et ses structures d' intercroissance, on a effectué des images de réseau bidimensionnelles en faisceau incliné en utilisant des réflexions choisies (à partir des conditions d'image dans le cas d'une structure 6H simple) afin d'obtenir des franges en chevrons simulant la séquence d'empilement. Le fait important déduit de ces études d'images de réseau est l'existence de structures d'intercroissance entraînant la formation de structures de superpériodes (> 100 nm). Enfin, on a montré que le désordre à une dimension est dû soit à de grandes périodes, soit à un désordre non aléatoire, soit, dans très peu de cas, à un désordre aléatoire.Rai Raghaw S., Singh Sri R., Dubey Madan, Singh Govind. Lattice imaging studies on structure and disorder in SiC polytypes. In: Bulletin de Minéralogie, volume 109, 5, 1986. pp. 509-527