3,472 research outputs found
Community Development: A Guide for Grantmakers on Fostering Better Outcomes Through Good Process
Focuses on participation and collaboration as major elements of processes that are effective. Provides examples of, and offers tools for overcoming, challenges to collaboration. Includes strategies and resources for evaluation and collaboration
Anisotropy of Electrons Accelerated by a High-Intensity Laser Pulse
We describe a realistic model for a focused high-intensity laser pulse in
three dimensions. Relativistic dynamics of an electron submitted to such pulse
is described by equations of motion with ponderomotive potential depending on a
single free parameter in the problem, which we refer to as the "asymmetry
parameter". It is shown that the asymmetry parameter can be chosen to provide
quantitative agreement of the developed theory with experimental results of
Malka et al. [Phys. Rev. Lett. 78, 3314 (1997)] who detected angular asymmetry
in the spatial pattern of electrons accelerated in vacuum by a high-intensity
laser pulse
A Quantile Regression Model for Failure-Time Data with Time-Dependent Covariates
Since survival data occur over time, often important covariates that we wish
to consider also change over time. Such covariates are referred as
time-dependent covariates. Quantile regression offers flexible modeling of
survival data by allowing the covariates to vary with quantiles. This paper
provides a novel quantile regression model accommodating time-dependent
covariates, for analyzing survival data subject to right censoring. Our simple
estimation technique assumes the existence of instrumental variables. In
addition, we present a doubly-robust estimator in the sense of Robins and
Rotnitzky (1992). The asymptotic properties of the estimators are rigorously
studied. Finite-sample properties are demonstrated by a simulation study. The
utility of the proposed methodology is demonstrated using the Stanford heart
transplant dataset
Environmental Conflict Resolution: Strategies for Environmental Grantmakers
Outlines the strategies that are employed with the use of ECR to promote collaborative problem solving and manage disputes related to the use and development of natural resources. Includes a description of ten case studies where ECR was used effectively
Collaborative Governance: A Guide for Grantmakers
Provides a framework for understanding the different tools and approaches within the emerging field of collaborative governance. Includes case examples that illustrate how the process works, and how it can be applied in specific situations
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