Static load versus settlement for geometric shapes on cohesionless soil

Static loading versus settlement for circular plate, cone, and sphere on cohesionless soil - spacecraft landing gear stud

A lattice analogy for the solution of some nonlinear stress problems

Nonlinear stress problem solution by lattice analogy techniqu

Behavior of a sandy clay under vertical impact of geometric shapes

Sandy clay response under vertical impact of cone, plate, and plane geometric shape

Laboratory Diagnosis of Pregnancy

Laboratory methods for early diagnosis of pregnancy have found their greatest application in the human where clinical symptoms of the condition are not manifest until approximately 6 weeks following conception. With domestic animals, the mare stands alone as the animal to which laboratory tests may be applied. Diagnosis of pregnancy by rectal palpation in the mare is desired over laboratory methods because it is faster, more accurate and can be applied earlier in the gestation period. However, laboratory tests are employed on those mares whose delicate rectal mucous membranes may not tolerate manipulation. In highly bred mares with nervous temperaments it may be impossible to perform rectal palpation due to incooperation and possibility of abortion

Two Examples of Circular Motion for Introductory Courses in Relativity

The circular twin paradox and Thomas Precession are presented in a way that makes both accessible to students in introductory relativity courses. Both are discussed by examining what happens during travel around a polygon and then in the limit as the polygon tends to a circle. Since relativistic predictions based on these examples can be verified in experiments with macroscopic objects such as atomic clocks and the gyroscopes on Gravity Probe B, they are particularly convincing to introductory students.Comment: Accepted by the American Journal of Physics This version includes revision

Self-trapping at the liquid vapor critical point

Experiments suggest that localization via self-trapping plays a central role in the behavior of equilibrated low mass particles in both liquids and in supercritical fluids. In the latter case, the behavior is dominated by the liquid-vapor critical point which is difficult to probe, both experimentally and theoretically. Here, for the first time, we present the results of path-integral computations of the characteristics of a self-trapped particle at the critical point of a Lennard-Jones fluid for a positive particle-atom scattering length. We investigate the influence of the range of the particle-atom interaction on trapping properties, and the pick-off decay rate for the case where the particle is ortho-positronium.Comment: 12 pages, 3 figures, revtex4 preprin

Relationships Between Athlete Activist Identities and Resilience in College Athletes

Many high-profile athletes have engaged in athlete activism and continued to remain successful both in sport and activism. Although several barriers have been documented preventing athletes from engaging in activism (e.g., public criticism, status and job loss, withdrawal of funding, anticipated distress; Cunningham & Regan, 2012), activism itself has also been connected to several positive outcomes (e.g., improved confidence, self-concept, belief in change, agency, life meaning; Klar & Kasser, 2009; Rabkin, McElhiney, Harrington, & Horn, 2018). Indeed, both sport and activism provide opportunities for athlete activists to develop resilience. Therefore, the purpose of the present study was to examine the relationships between athletic identity (AI), activist identity and commitment (AIC), stress control mindset, and mental toughness. NCAA student-athletes (N = 204) reported low AIC overall. Regression models did not suggest that AI and AIC predict SCM or MT as expected, but correlations did provide evidence that SCM and MT are positively related. Possible explanations for these findings are discussed

Vortex fluidics-mediated DNA rescue from formalin-fixed museum specimens.

DNA from formalin-preserved tissue could unlock a vast repository of genetic information stored in museums worldwide. However, formaldehyde crosslinks proteins and DNA, and prevents ready amplification and DNA sequencing. Formaldehyde acylation also fragments the DNA. Treatment with proteinase K proteolyzes crosslinked proteins to rescue the DNA, though the process is quite slow. To reduce processing time and improve rescue efficiency, we applied the mechanical energy of a vortex fluidic device (VFD) to drive the catalytic activity of proteinase K and recover DNA from American lobster tissue (Homarus americanus) fixed in 3.7% formalin for >1-year. A scan of VFD rotational speeds identified the optimal rotational speed for recovery of PCR-amplifiable DNA and while 500+ base pairs were sequenced, shorter read lengths were more consistently obtained. This VFD-based method also effectively recovered DNA from formalin-preserved samples. The results provide a roadmap for exploring DNA from millions of historical and even extinct species

Observations on the vibration of axially-tensioned elastomeric pipes conveying fluids

A study of the effect of axial tension on the vibration of a single-span elastomeric pipe clamped at both ends conveying fluid has been carried out both experimentally and theoretically. A new mathematical model using a penalty function technique and the method of kinematic correction and fictitious loads has been developed. The influence of flowing fluid and axial tension on natural frequencies and mode shapes of the system has been described using this model and compared with experimental observations. Linear and non-linear dynamic response of the harmonically excited pipe has also been investigated for varying flow velocities and initial axial tensions