TRADE FLOWS AND MARKETING PRACTICES IN THE TEXAS NURSERY INDUSTRY

International Relations/Trade, Marketing,

Strange Quark Contribution to the Nucleon Spin from Electroweak Elastic Scattering Data

The total contribution of strange quarks to the intrinsic spin of the nucleon can be determined from a measurement of the strange-quark contribution to the nucleon's elastic axial form factor. We have studied the strangeness contribution to the elastic vector and axial form factors of the nucleon, using elastic electroweak scattering data. Specifically, we combine elastic $\nu p$ and $\bar{\nu} p$ scattering cross section data from the Brookhaven E734 experiment with elastic $ep$ and quasi-elastic $ed$ and $e$-$^4$He scattering parity-violating asymmetry data from the SAMPLE, HAPPEx, G0 and PVA4 experiments. We have not only determined these form factors at individual values of momentum-transfer ($Q^2$), but also have fit the $Q^2$-dependence of these form factors using simple functional forms. We present the results of these fits, along with some expectations of how our knowledge of these form factors can be improved with data from Fermilab experiments.Comment: 3 pages, 1 figure, CIPANP 201

Keeping Count: Studying the Effects of Previous Sexual History on a Current Coupling

The following thesis details a quantitative study focusing on the sexual double standard and how its impact on sexual attitudes and behaviors has a possible influence on relationship satisfaction. The purpose of this research is to understand how attitudes regarding the prevailing double standard reflect the hesitancy towards having a partner with a previous sexual history as the discussion suggests. There will be a review of previous literature for the traditional, cultural, and even paradoxical aspects that make up the standard. Findings of the study showed that there was no significant relationship found between a respondent’s acceptance of the sexual double standard and their relationship satisfaction scores. However, significant relationships were found amongst gender and the sexual double standard as well as gender and relationships satisfaction. In both instances, gender is treated as a predicting variable. These findings help steer the forward direction of the standard, gender and sexual identity, and clinical implications on clients’ sexual narratives. The importance of this is for support in understanding which societal or self messages are influencing clients\u27 views on sexuality and how that might contribute to distress experienced about sex

Strangeness contribution to the vector and axial form factors of the nucleon

The strangeness contribution to the vector and axial form factors of the nucleon is presented for momentum transfers in the range $0.45<Q^2<1.0$ GeV$^2$. The results are obtained via a combined analysis of forward-scattering parity-violating elastic $\vec{e}p$ asymmetry data from the $G^0$ and HAPPEx experiments at Jefferson Lab, and elastic $\nu p$ and $\bar{\nu} p$ scattering data from Experiment 734 at Brookhaven National Laboratory. The parity-violating asymmetries measured in elastic $\vec{e}p$ scattering at forward angles establish a relationship between the strange vector form factors $G_E^s$ and $G_M^s$, with little sensitivity to the strange axial form factor $G_A^s$. On the other hand, elastic neutrino scattering at low $Q^2$ is dominated by the axial form factor, with still some significant sensitivity to the vector form factors as well. The combination of the two data sets allows the simultaneous extraction of $G_E^s$, $G_M^s$, and $G_A^s$ over a significant range of $Q^2$ for the very first time.Comment: 3 pages, 1 figure, will appear in AIP Conference Proceedings for PANIC 200

A human factors analysis of EVA time requirements

Human Factors Engineering (HFE), also known as Ergonomics, is a discipline whose goal is to engineer a safer, more efficient interface between humans and machines. HFE makes use of a wide range of tools and techniques to fulfill this goal. One of these tools is known as motion and time study, a technique used to develop time standards for given tasks. A human factors motion and time study was initiated with the goal of developing a database of EVA task times and a method of utilizing the database to predict how long an ExtraVehicular Activity (EVA) should take. Initial development relied on the EVA activities performed during the STS-61 mission (Hubble repair). The first step of the analysis was to become familiar with EVAs and with the previous studies and documents produced on EVAs. After reviewing these documents, an initial set of task primitives and task time modifiers was developed. Videotaped footage of STS-61 EVAs were analyzed using these primitives and task time modifiers. Data for two entire EVA missions and portions of several others, each with two EVA astronauts, was collected for analysis. Feedback from the analysis of the data will be used to further refine the primitives and task time modifiers used. Analysis of variance techniques for categorical data will be used to determine which factors may, individually or by interactions, effect the primitive times and how much of an effect they have

Friday timing plus social media multipliers may mean Paris attacks have more impacts on markets

The true consequence to business remains to be seen, write Michael D. Larobina and Richard L. Pat

Ultrasonic Transducer Calibration for Reciprocity-Based Measurement Models

A general formulation regarding the relationship between scatterer properties and experimental signals was presented in a companion paper[1]. This formulation was developed for the case of acoustic wave scattering in an immersion measurement. In order to perform the theoretical calculations, the formulation requires knowledge of the radiation and reception characteristics of the probes involved and the combined properties of the pulser and the receiver (system efficiency). Thus, the objective of this paper is to discuss methods for obtaining the characteristics of measurement systems as required in the above-mentioned formulation. As an example, the case of acoustic wave scattering from a sphere of finite size is examined. Experimental verifications of results are included

Characterization of Ultrasonic Immersion Transducers

In any ultrasonic NDE experiment, the distributed field properties of the transducer involved represent an important aspect of the overall measurement process. The normal velocity profile across the active face of the transducer is typically used to characterize these properties. In quantitative NDE applications, a simple parametric form is usually assumed for this profile, such as a rigid piston with either the nominal or so-called active probe diameter taken as the parameter value. It has been shown in related studies that such an approach does not characterize all UT transducers accurately in all measurement situations (particularly nearfield versus farfield locations). Thus a new method for individual transducer characterization is presented herein that is based on reconstructions of the unknown probe velocity profile from measurements of the radiated field