Isotopic and Microstructural Analyses of Opaque Mineral Assemblages and Their Alteration Products Hosted in a Refractory Inclusion

Calcium-aluminum-rich inclusions (CAIs) hosted in primitive meteorites are the oldest solids formed in the Solar System. Some CAIs contain metal nuggets that are complex assemblages of Fe-Ni alloys, along with rare ultra-refractory metals such as platinum group elements (PGEs), and their alteration products such as magnetite, sulfides, and phosphates. Three possible mechanisms proposed to explain the origin of these metal nuggets include condensation in circumstellar settings, condensation in the solar nebula within the CAI-forming region, or crystallization from immiscible metal-silicate melt. However, secondary alteration processes may have also affected some of these assemblages. Additionally, similar metal assemblages observed in chondrules and chondritic matrix indicate that all of these metal nuggets could share common high-temperature origins. These metal assemblages record early Solar System conditions that are reflected in their distinctive chemical composition, mineralogy and microstructures. Here we report a detailed mineralogical, microstructural and oxygen isotopic study of one such metal assemblage hosted in a CAI to understand the physical and chemical settings in which it formed

Oxygen Isotopic Imaging of Refractory Inclusions from the Miller Range (MIL) 090019 CO3 Chondrite: A Perovskite Perspective

Calcium-Aluminum-rich Inclusions (CAIs) in primitive meteorites are the first solids to condense in the Solar System. The oxygen isotopic compositions recorded in various mineral components of CAIs provide clues about their origins and post-formation histories, recording processes such as condensation, melting, nebular alteration, and fluidrock reactions on the parent body. MIL 090019 is similar to some rare carbonaceous chondrites such as Acfer 094, DOM 08004/6 and ALH 77303 that contain high abundances of a variety of refractory inclusions. This provides an opportunity to study the oxygen isotopic record of different types of refractory inclusions within the same meteorite. We analyzed CAIs specifically targeting primary minerals that are direct nebular condensates, such as corundum and perovskite, with the goal of gaining insights into the O isotopic composition of the nebular gas(es) from which these CAIs condensed. As MIL 090019 is a classified as CO3.1, it shows some signs of thermal metamorphism, compared to the more primitive CO3 meteorites (e.g., DOM 08004/06). A second goal of this study is to search for evidence of nebular processes in phases such as perovskite and melilite that are susceptible to parent body alteration to varying degrees. We analyzed the oxygen isotopic compositions of various CAIs from the MIL 090019 CO3 carbonaceous chondrite by ion imaging using the NanoSIMS 50L (Nano Secondary Ion Mass Spectrometer) at JSC following methods described in. An advantage of ion imaging over traditional spot analyses is that it provides spatial context to the oxygen isotopic data. This work builds on previously reported oxygen isotopic composition of two other CAIs (CAI-44 and CAI-E2) from the same meteorite thin section

Coefficient of correlation between pH and alkalinity of sangmeshwar reservoir in osmanabad district, Maharshtra, India

The present study attempts to bring an acute awareness among the people about the quality of ground water by taking water samples from specific locations for analysis. During present investigation an attempt has been made to study the physico chemical properties of Sangmeshwar reservoir, Osmanabad district of Maharashtra State, India. In this paper an attempt has been made to correlate the pH and alkalinity of reservoir water

Use of Electronic Resources by Law Academics in India

This study investigated e-resources use, storage, the preferred format for reading, and difficulties faced while accessing e-resources. Electronic resources are playing a crucial role all over the world, and they are increasing widely in all age groups of the academic community. The main aim of the law academics\u27 role is to know the effective use of electronic resources. For this study, we adopted a descriptive survey research design that was used to collect feedback from the respondents through the survey and Google form. The study samples are Progressive Education Society\u27s Modern Law College affiliated with Savitribai Phule Pune University. BA LLB students are samples of the study. The study findings reveal that 95.1% of student respondents are aware of e-resources; 75.7% of respondents used college websites for accessing legal electronic resources. The most noticeable is that 95.1% of users prefer reading in Portable Document Format (PDF). Overall, more than 50% of respondents felt e-resources are easy to access, time-saving, and search tools. The findings of this study are helpful to library professionals to subscribe to more e-resources. The research suggests that library professionals have to guide the users to conduct orientation on accessing the e-resources more effectively. Students expected user manuals for accessing some databases and e-resources based on the findings, recommendations were made

Improving I/O Performance using Cache as a Service on Cloud

Caching is gaining popularity in Cloud world. It is one of the key technologies which plays a major role in bridging the performance gap between memory hierarchies through spatial or temporal localities. In cloud systems, heavy I/O activities are associated with different applications. Due to heavy I/O activities, performance is degrading. If caching is implemented, these applications would be benefited the most. The use of a Cache as a Service (CaaS) model as a cost efficient cache solution to the disk I/O problem. We have built the remote-memory based cache that is pluggable and file system independent to support various configurations. The cloud Server process introduce, pricing model together with the elastic cache system. This will increase the disk I/O performance of the IaaS, and it will reduce the usage of the physical machines. DOI: 10.17762/ijritcc2321-8169.150516