23,715 research outputs found
Continuous turning slip ring assembly Patent
Development of slip ring assembly with inner and outer peripheral surfaces used as electrical contacts for brushe
Recommended from our members
What causes the word gap? Financial concerns may systematically suppress child-directed speech
Parents with fewer educational and economic resources (low socioeconomic-status, SES) tend to speak less to their children, with consequences for children’s later life outcomes. Despite this well-established and highly popularized link, surprisingly little research addresses why the SES “word gap” exists. Moreover, existing research focuses on individual-level explanations with little attention to structural constraints with which parents must contend. In two pre-registered studies, we test whether experiencing financial scarcity itself can suppress caregivers’ speech to their children. Study 1 suggests that caregivers who are prompted to reflect on scarcity—particularly those who reflect on financial scarcity—speak to their 3-year-olds less than a control group in a subsequent play session. Study 2 finds that caregivers speak less to their children at the end of the month—when they are more likely to be experiencing financial hardship—than the rest of the month. Thus, above and beyond the individual characteristics of parents, structural constraints may affect how much parents speak to their children
Alaska Coastal Community Youth and the Future
The Alaska Sea Grant College Program.
Project No. R/72-02.Executive Summary / Introduction / Background to the Research / Methods / Findings / Discussion and Policy Recommendations / Products from the Research / References Cited / Appendix A. Focus Group Protocol (High School) / Appendix B. Focus Group Protocol (12-20 year olds) / Appendix C. Focus Group Questionnaire / Appendix D. Occupational Rating Worksheet / Appendix E. Consent/Assent For
Resolving the black hole information paradox
The recent progress in string theory strongly suggests that formation and
evaporation of black holes is a unitary process. This fact makes it imperative
that we find a flaw in the semiclassical reasoning that implies a loss of
information. We propose a new criterion that limits the domain of classical
gravity: the hypersurfaces of a foliation cannot be stretched too much. This
conjectured criterion may have important consequences for the early Universe.Comment: harvmac, 11 pages (1 figure) (This essay received an ``honorable
mention'' in the Annual Essay Competition of the Gravity Research Foundation
for the year 2000.
Solar cell radiation response near the interface of different atomic number materials
The response of cobalt 60 irradiated N/P silicon solar cells was measured as a function of the atomic number of the medium adjacent to the cell and the direction of the gamma ray beam. The interpositioning of various thicknesses of aluminum between the adjacent material and the cell had the effect of moving the cell to various locations in an approximate monatomic numbered medium. Using this technique the solar cell response was determined at various distances from the interface for gold and beryllium. The results were compared with predictions based upon ionization chamber measurements of dose perturbations in aluminum and found to agree within five percent. Ionization chamber data was then used to estimate the influence of various base contact materials
Some comments on embedding inflation in the AdS/CFT correspondence
The anti-de Sitter space/conformal field theory correspondence (AdS/CFT) can
potentially provide a complete formulation of string theory on a landscape of
stable and metastable vacua that naturally give rise to eternal inflation. As a
model for this process, we consider bubble solutions with de Sitter interiors,
obtained by patching together dS and Schwarzschild-AdS solutions along a bubble
wall. For an interesting subclass of these solutions the bubble wall reaches
spacelike infinity in the black hole interior. Including the effects of
perturbations leads to a null singularity emanating from this point. Such
solutions are interpreted as states in a single CFT, and are shown to be
compatible with holographic entropy bounds. The construction suggests de Sitter
entropy be interpreted as the total number of degrees of freedom in effective
field theory, with a novel adaptive stepsize cutoff.Comment: 15 pages, 4 figures, revtex
Analysis of ISER 2008-2009 Survey Data
In September 2008, the superintendent of the Anchorage School District and the mayor of
Anchorage sent a letter to the governor of Alaska, reporting what they thought might be an influx
of students into Anchorage from rural communities. Enrollment in the school district was higher
than expected, and it coincided with the largest-ever Alaska Permanent Fund dividend and with a
one-time payment of $1,200 the state made per person, to help offset high energy costs.
Researchers at the Institute of Social and Economic Research (ISER) at UAA have a
longstanding interest in migration patterns in Alaska and the Arctic, and they saw the increased
enrollment in Anchorage schools as a potential opportunity to better understand:
• If rural Alaskans are moving to Anchorage
• Where they are coming from
• Why they are moving
So with the cooperation of the Anchorage School District, ISER conducted a survey of the
parents or guardians of students who had enrolled in Anchorage in the 2007-2008 or 2008-2009
school years and who had transferred in from other Alaska school districts.
Besides finding out where students were coming from—and why—another purpose of the study
was to provide the Anchorage School District and the Municipality of Anchorage with
information about what they could do to help students and families who are new to the city. To
our knowledge, this may be the first survey ever conducted to find out why people move to
Anchorage from other areas of Alaska.University of Alaska Foundation.
BP-Conoco Phillips Charter AgreementExecutive Summary / Introduction / Methods / Where are Alaskan's Moving From? / Organization of Survey Findings / Migration Patterns / Who is Moving? / Challenges and Transitions / Conclusions and Recommendations / References / Appendix A. Survey For
- …
