Using the Radial Velocity to Search for Orbiting Planets Around Mira

We researched radio astronomical data from the star Omicron Ceti, more commonly known as Mira, to determine if there is evidence for orbiting planets. There is a variation in the silicon monoxide maser radial velocity of Mira that could have been due to the effect of orbiting planets. We analyzed the radial velocity data collected from Mira over the past forty years. The data were examined for periodicities. A periodicity refers to a repeating pattern within the data. Three possible frequencies were found. Each frequency within the star had the potential to be a pattern caused by an orbiting planet. The three frequencies were approximated with three sine waves. The radial velocity versus time was fit with a curve that was the sum of the three sine waves. The amplitudes of the fit sine waves model the change in velocity centroid of Mira possibly due to orbiting planets. From the wave amplitudes the masses of the suspected planets were estimated. If the periodicities of Mira were caused by orbiting planets, two of the “planets” would be about one twentieth the mass of Mira and the other “planet” would be about one fifth the mass of Mira. The amplitudes of the three fit sine waves are too large to be caused by orbiting planets. The changes in the velocity of Mira are probably due to periodicities within the star.https://digitalcommons.morris.umn.edu/urs_2013/1001/thumbnail.jp

Adverse Childhood Experiences and their Connection to Autoimmune Disease in Adulthood

Everyday in the United States, a child experiences a traumatic event. Autoimmune disease is one of the top two leading causes of death in the United States. Can these two horrifying events be connected? Autoimmune diseases currently affect millions of Americans and are considered an epidemic because of their prevalence within the adult population. Even with a high number of cases, this possible connection has been largely ignored and under researched for the history of modern medicine. However, two studies have begun to make the connection between adverse childhood experiences and how that affects the onset of autoimmune diseases in adulthood. This field of medicine is under-researched even though it may be the key to understanding the physiological or physical cause of suffering for millions of Americans. Childhood trauma may be the missing key to understanding the cause of adulthood autoimmune disease. With the prevalence of childhood traumatic experiences and autoimmune diseases, the reason for this lack of research is unexplainable, however it opens to door to future studies regarding the possible affect of childhood trauma on autoimmune disease development

Analysis of Tyre Tread for Metal Tracers with Applications in Environmental Monitoring

The purpose of this study was to identify a characteristic elemental tyre fingerprint that can be utilised in atmospheric source apportionment calculations. Currently zinc is widely used as a single element tracer to quantify tyre wear, however several authors have highlighted issues with this approach. To overcome this, tyre rubber tread was digested and has been analysed for 25 elements by ICP-MS to generate a multielement profile. Additionally, to estimate the percentage of the tyre made up of inert fillers, thermogravimetric analysis was performed on a subset. Comparisons were made between passenger car and heavy goods vehicle tyre composition, and a subset of tyres had both tread and sidewall sampled for further comparison. Finds showed 19 of the 25 elements were detected in the analysis. The mean mass fraction of zinc detected was 11.17 g/kg, consistent with previous estimates of 1% of the tyre mass. Aluminium, iron, and magnesium were found to be the next most abundant elements, and barium, magnesium and tin were all detected at higher concentrations than have been reported previously. The analysis found significant differences in elemental composition of goods vehicle and passenger car tyres, which could potentially allow for separate source profiles for each type. Only one source profile for tyre wear exists in both the US and EU air pollution species profile databases, highlighting the need for more recent data with better coverage of tyre makes and models. This study provides data on new tyres which are currently operating on-road in Europe and is therefore relevant for ongoing atmospheric studies assessing the levels of tyre wear particles in urban areas

Multi-element analysis of tyre rubber for metal tracers

The purpose of this study was to identify a characteristic elemental tyre fingerprint that can be utilised in atmospheric source apportionment calculations. Currently zinc is widely used as a single element tracer to quantify tyre wear, however several authors have highlighted issues with this approach. To overcome this, tyre rubber tread was digested and has been analysed for 25 elements by ICP-MS to generate a multielement profile. Additionally, to estimate the percentage of the tyre made up of inert fillers, thermogravimetric analysis was performed on a subset. Comparisons were made between passenger car and heavy goods vehicle tyre composition, and a subset of tyres had both tread and sidewall sampled for further comparison. 19 of the 25 elements were detected in the analysis. The mean mass fraction of zinc detected was 11.17 g/kg, consistent with previous estimates of 1% of the tyre mass. Aluminium, iron, and magnesium were found to be the next most abundant elements. Only one source profile for tyre wear exists in both the US and EU air pollution species profile databases, highlighting the need for more recent data with better coverage of tyre makes and models. This study provides data on new tyres which are currently operating on-road in Europe and is therefore relevant for ongoing atmospheric studies assessing the levels of tyre wear particles in urban areas

Multi-element analysis of tyre rubber for metal tracers

The purpose of this study was to identify a characteristic elemental tyre fingerprint that can be utilised in atmospheric source apportionment calculations. Currently zinc is widely used as a single element tracer to quantify tyre wear, however several authors have highlighted issues with this approach. To overcome this, tyre rubber tread was digested and has been analysed for 25 elements by ICP-MS to generate a multielement profile. Additionally, to estimate the percentage of the tyre made up of inert fillers, thermogravimetric analysis was performed on a subset. Comparisons were made between passenger car and heavy goods vehicle tyre composition, and a subset of tyres had both tread and sidewall sampled for further comparison. 19 of the 25 elements were detected in the analysis. The mean mass fraction of zinc detected was 11.17 g/kg, consistent with previous estimates of 1% of the tyre mass. Aluminium, iron, and magnesium were found to be the next most abundant elements. Only one source profile for tyre wear exists in both the US and EU air pollution species profile databases, highlighting the need for more recent data with better coverage of tyre makes and models. This study provides data on new tyres which are currently operating on-road in Europe and is therefore relevant for ongoing atmospheric studies assessing the levels of tyre wear particles in urban areas.NIH