The Vehicle, Fall 2007

Table of Contents Is This Thing On?Nichole D\u27Antoniopage 1 Death Came KnockingJacob Dawsonpage 5 Awaiting DecemberRebecca Griffithpage 9 ginamarieElizabeth Hoodpage 11 She LongsJennifer O\u27Neilpage 12 ForgottenStephanie Drozdpage 13 Art House WomanGreg Harrellpage 14 Young Woman OlderAmanda Vealepage 15 FirstRebecca Griffithpage 17 FlowJacob Dawsonpage 19 Am Animal AwareDanielle Meyerpage 20 Geneva 04\u27Stephanie Guyerpage 21 Poland, 1942.Jennifer O\u27Neilpage 22 Witness to the Atrophy of ForestsDanielle Meyerpage 23 Helvellyn IJacob Fosterpage 24 Three Out of Five Ain\u27t BadThomas McElweepage 25 FarceAmanda Vealepage 31 Strength of EmotionJennifer O\u27Neilpage 32 About the Authors Art Submissions Prerequisite for a RequiemJenna Smithcover Girl 3Jenna Smithpage 14 ManJenna Smithpage 16 Give Peace a ChanceMegan Mathypage 16 GraceJennifer O\u27Neilpage 20 Oh, the Places You\u27ll Go!Megan Mathypage 23https://thekeep.eiu.edu/vehicle/1086/thumbnail.jp

The Vehicle, Fall 2007

Table of Contents Is This Thing On?Nichole D\u27Antoniopage 1 Death Came KnockingJacob Dawsonpage 5 Awaiting DecemberRebecca Griffithpage 9 ginamarieElizabeth Hoodpage 11 She LongsJennifer O\u27Neilpage 12 ForgottenStephanie Drozdpage 13 Art House WomanGreg Harrellpage 14 Young Woman OlderAmanda Vealepage 15 FirstRebecca Griffithpage 17 FlowJacob Dawsonpage 19 Am Animal AwareDanielle Meyerpage 20 Geneva 04\u27Stephanie Guyerpage 21 Poland, 1942.Jennifer O\u27Neilpage 22 Witness to the Atrophy of ForestsDanielle Meyerpage 23 Helvellyn IJacob Fosterpage 24 Three Out of Five Ain\u27t BadThomas McElweepage 25 FarceAmanda Vealepage 31 Strength of EmotionJennifer O\u27Neilpage 32 About the Authors Art Submissions Prerequisite for a RequiemJenna Smithcover Girl 3Jenna Smithpage 14 ManJenna Smithpage 16 Give Peace a ChanceMegan Mathypage 16 GraceJennifer O\u27Neilpage 20 Oh, the Places You\u27ll Go!Megan Mathypage 23https://thekeep.eiu.edu/vehicle/1086/thumbnail.jp

Spatially and temporally resolved temperature and shock-speed measurements behind a laser-induced blast wave of energetic nanoparticles

Spatially and temporally resolved temperature measurements behind an expanding blast wave are made using picosecond (ps) N2 coherent anti-Stokes Raman scattering (CARS) following laser flash heating of mixtures containing aluminum nanoparticles embedded in ammonium-nitrate oxidant. Production-front ps-CARS temperatures as high as 3600 ± 180 K-obtained for 50-nm-diameter commercially produced aluminum-nanoparticle samples-are observed. Time-resolved shadowgraph images of the evolving blast waves are also obtained to determine the shock-wave position and corresponding velocity. These results are compared with near-field blast-wave theory to extract relative rates of energy release for various particle diameters and passivating-layer compositions

Optimality of mutation and selection in germinal centers

The population dynamics theory of B cells in a typical germinal center could play an important role in revealing how affinity maturation is achieved. However, the existing models encountered some conflicts with experiments. To resolve these conflicts, we present a coarse-grained model to calculate the B cell population development in affinity maturation, which allows a comprehensive analysis of its parameter space to look for optimal values of mutation rate, selection strength, and initial antibody-antigen binding level that maximize the affinity improvement. With these optimized parameters, the model is compatible with the experimental observations such as the ~100-fold affinity improvements, the number of mutations, the hypermutation rate, and the "all or none" phenomenon. Moreover, we study the reasons behind the optimal parameters. The optimal mutation rate, in agreement with the hypermutation rate in vivo, results from a tradeoff between accumulating enough beneficial mutations and avoiding too many deleterious or lethal mutations. The optimal selection strength evolves as a balance between the need for affinity improvement and the requirement to pass the population bottleneck. These findings point to the conclusion that germinal centers have been optimized by evolution to generate strong affinity antibodies effectively and rapidly. In addition, we study the enhancement of affinity improvement due to B cell migration between germinal centers. These results could enhance our understandings to the functions of germinal centers.Comment: 5 figures in main text, and 4 figures in Supplementary Informatio

Epidemiology of physical activity and sedentary behavior levels among patients entering treatment for substance use disorder in the United States: a descriptive study

IntroductionLittle is known about physical activity behaviors among people with SUD. This study aimed to (a) describe self-reported moderate-to-vigorous physical activity (MVPA) and sedentary (SED) behaviors of adults with SUD initiating treatment (b), determine the potential contributions of drug of choice (DOC) on these behaviors, and (c) determine the potential contributions of level of care and demographic variables on these behaviors.MethodsSecondary data that was collected via surveys including demographic information, psychological health, drug of choice, MVPA (categorized as inactive, insufficiently active, meets guidelines, exceeds guidelines) and SED (<4 h/day, 4-<6 h/day, 6-8 h/day, >8 h/day) were analyzed from 1,293 patients in inpatient/outpatient treatment facilities across the United States. ResultsOn average, over half (51%) of patients entering treatment reported not meeting guidelines, but sitting time was generally low (median= 360 min/day). MVPA levels differed based on level of care (p<0.001) with 48% of patients in detox facilities reporting inactivity compared to 37% in residential and 29% in outpatient programs. MVPA and SED levels differed by sex with women less likely to report sitting <4 h/day (27.9% vs. 38.2%, p<0.001) and more likely to report sitting for >8 h/day (31.5% vs. 21.8%, p<0.001) compared to men. SED differed by race (p=0.01), with 54% of Black patients reporting <4 h/day compared to 33% of White patients. DiscussionUnderstanding activity behavior patterns among individuals entering SUD treatment provides opportunities for identifying the extent of lifestyle behavior needs and opportunities to develop personalized treatment strategies

Front propagation into unstable and metastable states in Smectic C* liquid crystals: linear and nonlinear marginal stability analysis

We discuss the front propagation in ferroelectric chiral smectics (SmC*) subjected to electric and magnetic fields applied parallel to smectic layers. The reversal of the electric field induces the motion of domain walls or fronts that propagate into either an unstable or a metastable state. In both regimes, the front velocity is calculated exactly. Depending on the field, the speed of a front propagating into the unstable state is given either by the so-called linear marginal stability velocity or by the nonlinear marginal stability expression. The cross-over between these two regimes can be tuned by a magnetic field. The influence of initial conditions on the velocity selection problem can also be studied in such experiments. SmC$^*$ therefore offers a unique opportunity to study different aspects of front propagation in an experimental system

Measurement of Spin Correlation Parameters ANN_{NN}, ASS_{SS}, and A_SL{SL} at 2.1 GeV in Proton-Proton Elastic Scattering

At the Cooler Synchrotron COSY/J\"ulich spin correlation parameters in elastic proton-proton (pp) scattering have been measured with a 2.11 GeV polarized proton beam and a polarized hydrogen atomic beam target. We report results for A$_{NN}$, A$_{SS}$, and A_${SL}$ for c.m. scattering angles between 30$^o$ and 90$^o$. Our data on A$_{SS}$ -- the first measurement of this observable above 800 MeV -- clearly disagrees with predictions of available of pp scattering phase shift solutions while A$_{NN}$ and A_${SL}$ are reproduced reasonably well. We show that in the direct reconstruction of the scattering amplitudes from the body of available pp elastic scattering data at 2.1 GeV the number of possible solutions is considerably reduced.Comment: 4 pages, 4 figure

Adsorption of CO on a Platinum (111) surface - a study within a four-component relativistic density functional approach

We report on results of a theoretical study of the adsorption process of a single carbon oxide molecule on a Platinum (111) surface. A four-component relativistic density functional method was applied to account for a proper description of the strong relativistic effects. A limited number of atoms in the framework of a cluster approach is used to describe the surface. Different adsorption sites are investigated. We found that CO is preferably adsorbed at the top position.Comment: 23 Pages with 4 figure