High pressure cosmochemistry applied to major planetary interiors: Experimental studies

The overall goal of this project is to determine properties of the H-He-C-N-O system, as represented by small molecules composed of these elements, that are needed to constrain theoretical models of the interiors of the major planets. Much of our work now concerns the H2O-NH3 system. This project is the first major effort to measure phase equilibria in binary fluid-solid systems in diamond anvil cells. Vibrational spectroscopy, direct visual observations, and X-ray crystallography of materials confined in externally heated cells are our primary experimental probes. We also are collaborating with the shockwave physics group at Lawrence Livermore Laboratory in studies of the equation of state of a synthetic Uranus fluid and molecular composition of this and other H-C-N-O materials under planetary conditions

Day 1 - Embracing the “F” Bomb: The Who, What, and Why of Looking for Funding

Academic units across the university are placing increasing emphasis on securing extramural funding -- even in disciplines that have not traditionally required such activities to thrive. This poses unique challenges for many faculty, like some in the Humanities, Social Science, Business, and Interdisciplinary fields: Why do I need extramural funding to support my research? How does the institution create an inclusive culture for grantsmanship, and how do I foster one for myself? How have other scholars like me positioned themselves to be competitive grant getters? Where should I start, and what should I look for? This session is targeted to those who have, until now, not seen the full value of grant funding for their lines of inquiry

Prevention: Gender, Sexuality, HIV, and the Media in Côte d'Ivoire

(print) xi, 240 pages : illustrationsAIDS as an "imaginary syndrome": humor as negotiation of racism, austerity, and the single-party state -- Popular satiric state television programs and HIV prevention -- Regulating female reproductive potential: abortion and family as HIV prevention -- The melodrama and the social marketing of HIV prevention -- "Stay away from unhealthy places": sex work, condoms, and the NGO

Synthesis, Characterization And Biological Properties Of Nickel- And Iron- Carboxylate Complexes

In this research, nine Ni(II) complexes were successfully synthesized using nickel(II) chloride hexahydrate, NiCl2.6H2O with amino acids (Glycine, β-alanine and Lhistidine), carboxylic acids (2-picolinic acid, 3,5-dinitrobenzoic acid, 4- aminobenzoic acid and pyrazine-2-carboxylic acid) and with dicarboxylic acids (maleic acid and pyridine-2,6-dicarboxylic acid). Besides, two Fe(II) complexes and one Fe(III) complexes were also successfully synthesized. Fe(II) complexes were synthesized using iron(II) chloride 4-hydrate, FeCl2.4H2O with pyrazine-2- carboxylic acid and maleic acid respectively

Synthesis, Characterization And Biological Properties Of Nickel- And Ironcarboxylate Complexes

Dalam projek penyelidikan ini, sembilan kompleks Ni(II) telah berjaya disintesiskan daripada tindak balas antara nikel(II) klorida heksahidrat In this research, nine Ni(II) complexes were successfully synthesized using nickel(II) chloride hexahydrat

High Pressure Thermoelasticity of Body-centered Cubic Tantalum

We have investigated the thermoelasticity of body-centered cubic (bcc) tantalum from first principles by using the linearized augmented plane wave (LAPW) and mixed--basis pseudopotential methods for pressures up to 400 GPa and temperatures up to 10000 K. Electronic excitation contributions to the free energy were included from the band structures, and phonon contributions were included using the particle-in-a-cell (PIC) model. The computed elastic constants agree well with available ultrasonic and diamond anvil cell data at low pressures, and shock data at high pressures. The shear modulus $c_{44}$ and the anisotropy change behavior with increasing pressure around 150 GPa because of an electronic topological transition. We find that the main contribution of temperature to the elastic constants is from the thermal expansivity. The PIC model in conjunction with fast self-consistent techniques is shown to be a tractable approach to studying thermoelasticity.Comment: To be appear in Physical Review

Melting curve and phase diagram of vanadium under high-pressure and high-temperature conditions

We report a combined experimental and theoretical study of the melting curve and the structural behavior of vanadium under extreme pressure and temperature. We performed powder x-ray diffraction experiments up to 120 GPa and 4000 K, determining the phase boundary of the bcc-to-rhombohedral transition and melting temperatures at different pressures. Melting temperatures have also been established from the observation of temperature plateaus during laser heating, and the results from the density-functional theory calculations. Results obtained from our experiments and calculations are fully consistent and lead to an accurate determination of the melting curve of vanadium. These results are discussed in comparison with previous studies. The melting temperatures determined in this study are higher than those previously obtained using the speckle method, but also considerably lower than those obtained from shock-wave experiments and linear muffin-tin orbital calculations. Finally, a high-pressure high-temperature equation of state up to 120 GPa and 2800 K has also been determined

A new molecular solid phase of carbon dioxide at high pressure and temperature

We report the discovery of a new high-pressure molecular phase of carbon dioxide. The new polymorph, CO{sub 2} -IV, is formed by heating the high-pressure orthorhombic phase III to temperatures above 1000K at pressures between 12 and 33GPa. Analysis of the Raman spectrum of the new phase suggests a structure lacking inversion symmetry