All-Orders Singular Emission in Gauge Theories

I present a class of functions unifying all singular limits for the emission of soft or collinear gluons in gauge-theory amplitudes at any order in perturbation theory. Each function is a generalization of the antenna functions of ref. [1]. The helicity-summed interferences these functions are thereby also generalizations to higher orders of the Catani--Seymour dipole factorization function.Comment: 5 pages, 1 figur

Ground reaction force estimates from ActiGraph GT3X+ hip accelerations.

Simple methods to quantify ground reaction forces (GRFs) outside a laboratory setting are needed to understand daily loading sustained by the body. Here, we present methods to estimate peak vertical GRF (pGRFvert) and peak braking GRF (pGRFbrake) in adults using raw hip activity monitor (AM) acceleration data. The purpose of this study was to develop a statistically based model to estimate pGRFvert and pGRFbrake during walking and running from ActiGraph GT3X+ AM acceleration data. 19 males and 20 females (age 21.2 ± 1.3 years, height 1.73 ± 0.12 m, mass 67.6 ± 11.5 kg) wore an ActiGraph GT3X+ AM over their right hip. Six walking and six running trials (0.95-2.19 and 2.20-4.10 m/s, respectively) were completed. Average of the peak vertical and anterior/posterior AM acceleration (ACCvert and ACCbrake, respectively) and pGRFvert and pGRFbrake during the stance phase of gait were determined. Thirty randomly selected subjects served as the training dataset to develop generalized equations to predict pGRFvert and pGRFbrake. Using a holdout approach, the remaining 9 subjects were used to test the accuracy of the models. Generalized equations to predict pGRFvert and pGRFbrake included ACCvert and ACCbrake, respectively, mass, type of locomotion (walk or run), and type of locomotion acceleration interaction. The average absolute percent differences between actual and predicted pGRFvert and pGRFbrake were 8.3% and 17.8%, respectively, when the models were applied to the test dataset. Repeated measures generalized regression equations were developed to predict pGRFvert and pGRFbrake from ActiGraph GT3X+ AM acceleration for young adults walking and running. These equations provide a means to estimate GRFs without a force plate

Probing the qudit depolarizing channel

For the quantum depolarizing channel with any finite dimension, we compare three schemes for channel identification: unentangled probes, probes maximally entangled with an external ancilla, and maximally entangled probe pairs. This comparison includes cases where the ancilla is itself depolarizing and where the probe is circulated back through the channel before measurement. Compared on the basis of (quantum Fisher) information gained per channel use, we find broadly that entanglement with an ancilla dominates the other two schemes, but only if entanglement is cheap relative to the cost per channel use and only if the external ancilla is well shielded from depolarization. We arrive at these results by a relatively simple analytical means. A separate, more complicated analysis for partially entangled probes shows for the qudit depolarizing channel that any amount of probe entanglement is advantageous and that the greatest advantage comes with maximal entanglement

Critical success factors for projects

More and more organisations are recognising that translating corporate strategies into actions requires projects. Consequently, it is vital that projects are successful. Critical success factors are important influences that contribute to project success. This paper reports the outcome of a survey on critical success factors derived from the responses of 150 members of the Australian Institute of Project Management. A synthesis of the responses discerned fifteen critical success factors, of which two were predominant - project understanding and competent project team

Project Success - A Survey

Over the past decade there has been a growing literature on project success criteria, however there has been relatively little empirical data. This paper provides a significant contribution to the knowledge of project success by providing empirical data on the subject, by means of a survey of 150 Australian project managers on the subject of project success criteria. An analysis of the data found two distinct views: those that perceived project success solely in terms of the traditional project objectives of time, cost and quality; and those that considered success in terms of these objectives and the effectiveness of the project?s product. The traditional project management success criteria of time, cost and quality still has a strong hold within the project management community in Australia. However, the most important success criterion was considered to be the product success criterion of meeting the owner?s needs

Mixed state Pauli channel parameter estimation

The accuracy of any physical scheme used to estimate the parameter describing the strength of a single qubit Pauli channel can be quantified using standard techniques from quantum estimation theory. It is known that the optimal estimation scheme, with m channel invocations, uses initial states for the systems which are pure and unentangled and provides an uncertainty of O[1/m^(1/2)]. This protocol is analogous to a classical repetition and averaging scheme. We consider estimation schemes where the initial states available are not pure and compare a protocol involving quantum correlated states to independent state protocols analogous to classical repetition schemes. We show, that unlike the pure state case, the quantum correlated state protocol can yield greater estimation accuracy than any independent state protocol. We show that these gains persist even when the system states are separable and, in some cases, when quantum discord is absent after channel invocation. We describe the relevance of these protocols to nuclear magnetic resonance measurements

Perceptions of Skills Needed to Engage in Collaborative Community Problem Solving: Implications for Community Psychology Practice and Training

This paper provides a brief review of the results of a survey of Family and Children First Council Coordinators in Ohio. Sixty-eight (68) local Coordinators responded to a survey regarding their perceptions of skills needed to facilitate collaborative community problem solving. The authors argue that Council Coordinators fill a critical role in the collaborative community problem solving process. They refer to this role as “community support.” Analysis of survey data provided an opportunity to consider the skills Council Coordinators felt were important to their community support roles. In addition, the community support role and its importance are described. The authors also suggest that community psychology practitioners are ideal candidates for assuming such roles. Finally, implications for training community psychology practitioners are addressed

Perceptions of Skills Needed to Engage in Collaborative Community Problem Solving: Implications for Community Psychology Practice and Training

This paper provides a brief review of the results of a survey of Family and Children First Council Coordinators in Ohio. Sixty-eight (68) local Coordinators responded to a survey regarding their perceptions of skills needed to facilitate collaborative community problem solving. The authors argue that Council Coordinators fill a critical role in the collaborative community problem solving process. They refer to this role as “community support.” Analysis of survey data provided an opportunity to consider the skills Council Coordinators felt were important to their community support roles. In addition, the community support role and its importance are described. The authors also suggest that community psychology practitioners are ideal candidates for assuming such roles. Finally, implications for training community psychology practitioners are addressed