27,664 research outputs found
Home work in the elementary school: a study in two communities
Thesis (Ed.M.)--Boston Universit
Israel Education Through Encounters With Israelis
This guide probes the broad subject of contact between Diaspora Jews and Israelis both in Israel and in your Jewish community. It describes the instances in which encounters currently occur, present some of the issues which need to be addressed by those wishing to enhance the experience, and recommend specific ways for expanding and increasing the effectiveness of such a potentially rich form of Israel education
Constructions and Noise Threshold of Hyperbolic Surface Codes
We show how to obtain concrete constructions of homological quantum codes
based on tilings of 2D surfaces with constant negative curvature (hyperbolic
surfaces). This construction results in two-dimensional quantum codes whose
tradeoff of encoding rate versus protection is more favorable than for the
surface code. These surface codes would require variable length connections
between qubits, as determined by the hyperbolic geometry. We provide numerical
estimates of the value of the noise threshold and logical error probability of
these codes against independent X or Z noise, assuming noise-free error
correction
The importance of economic expectations for retirement entry
This paper analyses how strongly anticipated economic circumstances might impact on individuals retirement decisions.
Abstract
We estimate hazard rates of retirement entry as a function of the option value of work. The individuals’ expectations about the future economy are incorporated in the option value of work, through which they can impact on the timing of retirement entry. In a scenario where individuals expect a strong upturn, the annual hazard rate of retirement entry (average 8.4%) is reduced by 6.0% or half a percentage point compared to a scenario where they expect a downturn. Had individuals been able to anticipate the Global Financial Crisis, the mere expectation of this downturn would have increased retirement entries by 8.7%
An Experiment in Scaling Impact: Assessing the Growth Capital Aggregation Pilot
This report presents an assessment of the Growth Capital Aggregation Pilot. It was commissioned by the Edna McConnell Clark Foundation, founder and lead investor of the grantmaking initiative.Starting in 2000, The Edna McConnell Clark Foundation (Clark) adopted an investment approach to grantmaking that focused on providing growth capital to youth-serving organizations with demonstrated commitments to evaluation and measurable outcomes. For grantees, the strategy meant larger, longer-term, unrestricted investments, complemented by extensive access to consulting and technical assistance to strengthen their organizations.This approach helped Clark grantees across the portfolio increase the numbers of youth they served (for example, by 18 percent between 2005 and 2006) and achieve annual revenue gains (averaging 19 percent over the four years prior to the founding of GCAP). At the same time, the Foundation concluded that more capital would be required if its grantees and other promising youth-serving organizations were to realize their ultimate scale and sustainability potential
Space-Time Circuit-to-Hamiltonian Construction and Its Applications
The circuit-to-Hamiltonian construction translates dynamics (a quantum
circuit and its output) into statics (the groundstate of a circuit Hamiltonian)
by explicitly defining a quantum register for a clock. The standard
Feynman-Kitaev construction uses one global clock for all qubits while we
consider a different construction in which a clock is assigned to each
interacting qubit. This makes it possible to capture the spatio-temporal
structure of the original quantum circuit into features of the circuit
Hamiltonian. The construction is inspired by the original two-dimensional
interacting fermionic model (see
http://link.aps.org/doi/10.1103/PhysRevA.63.040302) We prove that for
one-dimensional quantum circuits the gap of the circuit Hamiltonian is
appropriately lower-bounded, partially using results on mixing times of Markov
chains, so that the applications of this construction for QMA (and partially
for quantum adiabatic computation) go through. For one-dimensional quantum
circuits, the dynamics generated by the circuit Hamiltonian corresponds to
diffusion of a string around the torus.Comment: 27 pages, 5 figure
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