This book provides a rigorous treatment of the coupling of chemical reactions and fluid flow. Combustion-specific topics of chemistry and fluid mechanics are considered and tools described for the ...simulation of combustion processes.
The evolution of the placenta from a non-placental ancestor causes a shift of maternal investment from pre- to post-fertilization, creating a venue for parent-offspring conflicts during pregnancy. ...Theory predicts that the rise of these conflicts should drive a shift from a reliance on pre-copulatory female mate choice to polyandry in conjunction with post-zygotic mechanisms of sexual selection. This hypothesis has not yet been empirically tested. Here we apply comparative methods to test a key prediction of this hypothesis, which is that the evolution of placentation is associated with reduced pre-copulatory female mate choice. We exploit a unique quality of the livebearing fish family Poeciliidae: placentas have repeatedly evolved or been lost, creating diversity among closely related lineages in the presence or absence of placentation. We show that post-zygotic maternal provisioning by means of a placenta is associated with the absence of bright coloration, courtship behaviour and exaggerated ornamental display traits in males. Furthermore, we found that males of placental species have smaller bodies and longer genitalia, which facilitate sneak or coercive mating and, hence, circumvents female choice. Moreover, we demonstrate that post-zygotic maternal provisioning correlates with superfetation, a female reproductive adaptation that may result in polyandry through the formation of temporally overlapping, mixed-paternity litters. Our results suggest that the emergence of prenatal conflict during the evolution of the placenta correlates with a suite of phenotypic and behavioural male traits that is associated with a reduced reliance on pre-copulatory female mate choice.
Here, a measurement with high statistics of the differential energy spectrum of light elements in cosmic rays, in particular, of primary H plus He nuclei, is reported. The spectrum is presented in ...the energy range from 6 to 158 TeV per nucleus. Data was collected with the High Altitude Water Cherenkov (HAWC) Observatory between June 2015 and June 2019. The analysis was based on a Bayesian unfolding procedure, which was applied on a subsample of vertical HAWC data that was enriched to 82% of events induced by light nuclei. To achieve the mass separation, a cut on the lateral age of air shower data was set guided by predictions of CORSIKA/QGSJET-II-04 simulations. The measured spectrum is consistent with a broken power-law spectrum and shows a kneelike feature at around E = 24.0$^{+3.6}_{-3.1}$ TeV , with a spectral index γ = -2.51 ± 0.02 before the break and with γ = -2.83 ± 0.02 above it. The feature has a statistical significance of 4.1σ. Within systematic uncertainties, the significance of the spectral break is 0.8σ.
The High Resolution Fly's Eye (HiRes) experiment has observed the Greisen-Zatsepin-Kuzmin suppression (called the GZK cutoff) with a statistical significance of five standard deviations. HiRes' ...measurement of the flux of ultrahigh energy cosmic rays shows a sharp suppression at an energy of 6 x 10(19) eV, consistent with the expected cutoff energy. We observe the ankle of the cosmic-ray energy spectrum as well, at an energy of 4 x 10(18) eV. We describe the experiment, data collection, and analysis and estimate the systematic uncertainties. The results are presented and the calculation of the statistical significance of our observation is described.
We report studies of ultrahigh-energy cosmic-ray composition via analysis of depth of air shower maximum (X(max)), for air shower events collected by the High-Resolution Fly's Eye (HiRes) ...observatory. The HiRes data are consistent with a constant elongation rate d<X(max)>/dlog(E) of 47.9+/-6.0(stat)+/-3.2(syst) g/cm2/decade for energies between 1.6 and 63 EeV, and are consistent with a predominantly protonic composition of cosmic rays when interpreted via the QGSJET01 and QGSJET-II high-energy hadronic interaction models. These measurements constrain models in which the galactic-to-extragalactic transition is the cause of the energy spectrum ankle at 4x10(18) eV.
This volume introduces and reviews important basics and progress in the study of hard-sphere fluids and related systems. Their structure, thermodynamic properties, equations of state, as well as ...kinetic and transport properties, are considered.
The mechanics of biological tissues is a multidisciplinary and rapidly expanding area of research. The book points to important directions combining mechanical sciences with the exciting new ...developments in biology. It delivers state-of-the-art articles on: Mechanics of tissues at the molecular, cellular, tissue and organ levels. Mechanobiology, with particular reference to growth, remodeling, repair and aging. Experimental, microstructural and continuum mechanical perspectives with an emphasis on modelling, and simulating therapeutic and diagnostic procedures. Implementation of mechanical models in numerical codes to provide a tool for the design and development of prostheses. Numerical models have the potential to greatly improve diagnostics and therapeutical procedures that involve tissue mechanics.
Cellular senescence is the irreversible arrest of normally dividing cells and is driven by the cell cycle inhibitors Cdkn2a, Cdkn1a, and Trp53. Senescent cells are implicated in chronic diseases and ...tissue repair through their increased secretion of pro‐inflammatory factors known as the senescence‐associated secretory phenotype (SASP). Here, we use spatial transcriptomics and single‐cell RNA sequencing (scRNAseq) to demonstrate that cells displaying senescent characteristics are “transiently” present within regenerating skeletal muscle and within the muscles of D2‐mdx mice, a model of Muscular Dystrophy. Following injury, multiple cell types including macrophages and fibrog–adipogenic progenitors (FAPs) upregulate senescent features such as senescence pathway genes, SASP factors, and senescence‐associated beta‐gal (SA‐β‐gal) activity. Importantly, when these cells were removed with ABT‐263, a senolytic compound, satellite cells are reduced, and muscle fibers were impaired in growth and myonuclear accretion. These results highlight that an “acute” senescent phenotype facilitates regeneration similar to skin and neonatal myocardium.
An indirect measurement of the antiproton flux in cosmic rays is possible as the particles undergo deflection by the geomagnetic field. This effect can be measured by studying the deficit in the ...flux, or shadow, created by the Moon as it absorbs cosmic rays that are headed toward the Earth. The shadow is displaced from the actual position of the Moon due to geomagnetic deflection, which is a function of the energy and charge of the cosmic rays. The displacement provides a natural tool for momentum/charge discrimination that can be used to study the composition of cosmic rays. Using 33 months of data comprising more than 80 billion cosmic rays measured by the High Altitude Water Cherenkov observatory, we have analyzed the Moon shadow to search for TeV antiprotons in cosmic rays. Here, we present our first upper limits on the p¯/p fraction, which in the absence of any direct measurements provide the tightest available constraints of ~1 % on the antiproton fraction for energies between 1 and 10 TeV.
This open access book shows policymakers which initiatives work when responding to the increasing diversity in cities, towns and neighborhood's. In recent times, policymakers have grappled with ways ...of responding to this increase, which has resulted in a plethora of policy initiatives, some more effective than others. Bringing together a large amount of research and evidence-based policy recommendations, this book offers both a sense of strategic direction as well as more specific, actionable advice. It brings together a remarkable mixture of policy areas that touch upon issues of diversity, immigration policy, education, and labour policy. It is of benefit and importance to all those making policies for a country with increasing immigration.
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