Zircons in metacarbonate rocks from Sør Rondane Mountains, East Antarctica

第6回極域科学シンポジウム[OG] 地圏11月16日（月）　国立極地研究所３階セミナー

Effect of Annealing on Hardness and Elastic Modulus of Invar36 Thin Films Deposited by Direct Current Sputtering for Strain Gauge Applications

Invar36 thin film was deposited at room temperature on p-type silicon (100) substrates using DC magnetron sputtering technique. In order to investigate the post-annealing effect on the structural characteristics and mechanical properties of the prepared films, they were vacuum annealed for one hour at different temperatures viz. 200°C, 400°C and 500°C. Composition analysis, phase structure, microstructure and roughness of as-deposited and annealed Invar36 thin films were investigated by energy dispersive X-ray analysis (EDX), X-Ray diffraction (XRD) and Atomic Force Microscopy (AFM). Mechanical properties of Invar36 thin films were studied by nano indentation method. EDX analysis revealed a variation in nickel content with annealing. The XRD measurements indicated the phase transformation of Invar36 thin film with annealing. AFM analysis implied uniform surface morphology of the films, increase of surface roughness and grain size with annealing. The hardness (H) of the film decreased with annealing. Hardness of as-deposited, annealed at 200oC, 400oC and 500oC were found as 8.5±0.96 GPa, 7.64±0.35 GPa, 6.34±0.14GPa and 3.95±1.05 GPa, respectively. The elastic modulus of Invar36 thin films was increased with annealing. Elastic modulus of as-deposited, annealed at 200oC, 400oC and 500oC were found as 157.00±25.49 GPa, 166.0±11.8 GPa, 172.00±9.93 GPa and 176.00 ±10.78 GPa, respectively. These results are explained on the basis of the change of microstructure after annealing and the effect of the same on the mechanical properties of Invar36 thin films for strain gauge applications

Analysis of local delaminations caused by angle ply matrix cracks

Two different families of graphite/epoxy laminates with similar layups but different stacking sequences, (0,theta,-theta) sub s and (-theta/theta/0) sub s were analyzed using three-dimensional finite element analysis for theta = 15 and 30 degrees. Delaminations were modeled in the -theta/theta interface, bounded by a matrix crack and the stress free edge. The total strain energy release rate, G, along the delamination front was computed using three different techniques: the virtual crack closure technique (VCCT), the equivalent domain Integral (EDI) technique, and a global energy balance technique. The opening fracture mode component of the strain energy release rate, Gl, along the delamination front was also computed for various delamination lengths using VCCT. The effect of residual thermal and moisture stresses on G was evaluated

Micromechanical modeling of the machining behavior of natural fiber-reinforced polymer composites

This paper aims to develop a 2D finite element (FE) model at microscale for numerical simulation of the machining behavior of natural fiber-reinforced polymer (NFRP) composites. The main objective of this study is to reproduce the experimentally observed specific cutting behavior of natural fibers within the composite material. Flax fiber-reinforced polypropylene (PP) composites are modeled separately using an elasto-plastic behavior with a ductile damage criterion for flax fibers and PP matrix, while the microscopic interfaces are represented using the cohesive zone modeling (CZM). Numerical outputs are compared with experimental results for the FE model validation. Results show that the proposed FE model can reproduce the cutting force with a good precision for a large cutting speed range (12–80 m/min). The FE model shows also an efficiency and accuracy in predicting the cutting behavior of flax fibers by reproducing the fiber deformation, the fibers torn-off, and the fracture of the interfaces during machining. Moreover, the FE model can be an effective tool for analyzing the quality of the microscopic interfaces in the NFRP composites after machining

Apparent age of deposition of meta-carbonate rocks from Sør Rondane Mountains, East Antarctica

第2回極域科学シンポジウム/第31回極域地学シンポジウム 11月17日（木） 国立極地研究所　2階大会議

Comparison of chemically estimated depositional ages with zircon SHRIMP ages from metacarbonate rocks in the Sør Rondane Mountains, East Antarctica

第3回極域科学シンポジウム/第32回極域地学シンポジウム 11月30日（金） 国立極地研究所 ３階ラウン

Metrics for the assessment of quantity and quality of the data by Argo floats

187-192Observing system or research initiative's foundation lies on reliable in situ data from sensors, which accurately tell about various key parameters that are being measured. Argo floats had brought huge amount of ocean observational in-situ data which is widely used from analysis to modelling. Present work describes a metrics for analyzing performance of sensors on Argo floats which can be used to assess the performance of float or set of floats as a whole. A set of new metrics like Total Data Return, Quality Data Returned and Quality Data Expected are proposed including the well-known Half-Life Period utilizing all of the Argo profile data. From the analysis, temperature and sensors performance is found to be more than 80 % and average Half-Life is found to be 1065 days. These metrics provide the overall performance of the floats, and can also be applied to other similar floats deployed by other countries as well as sensors fitted on other oceanic platforms

Fishes and Corals of the World Listed in CITES Appendices

The first global 'Census of Marine Life (2010)' estimated that there are over 2, 30,000 species of organisms living in our Oceans. This census has analyzed the diversity, distribution and abundance of life in the world's oceans. It has been revealed that, the marine life is highly biologically diverse and it has been explored only partially so far. It is estimated that there are almost 22,000 fish species in the world, which is more than the total number of mammals, reptiles, amphibians, and birds combined and every year 100 new species are added to this list. Fish are divided into two major types. The first type is cartilaginous fish, which includes Sharks, Skate and Rays. The second type is the bony fish, which have a complete bony skeleton and are covered with bony scales. Bony fishes are the most common and account for over 90% of all fish.With all this diversity within; the ocean is a major contributor for the world food production. According to FAO (2010), the total world fish production has touched 88 million tons, out of which, inland capture fisheries contributed 11 million tons and the oceans contributed the rest of 77million ton