23,588 research outputs found
Trends in Intergenerational Earnings Mobility
This paper examines trends in intergenerational earnings mobility by estimating ordinary least squares, quantile regression, and transition matrix coefficients using five cohorts from the Panel Study of Income Dynamics, observed between 1968 and 1993. The results indicate that mobility increased for sons with respect to fathers and remained constant for sons and daughters with respect to mothers. Moreover, the findings from the father-son sample suggest that the difference between the mobility levels of the rich and the poor narrowed over this period. The estimated pattern of changing mobility is consistent with an increasing rate of regression to the mean.
Towards 2000: A Tougher Future for Australian Business?
The paper reports on the future business environment expected by top level Australian executives. It forecasts environmental changes to the year 2000 and updates projections reported in an earlier study. Specifically, top managers from 171 of Australia\u27s largest 500 corporations provide their views concerning world ecology, the economy, technology and political-social developments. Their perceptions are then linked to specific competitive strategies that are evoked by the long-range forecast which they expect
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Transposable Elements, Inflammation, and Neurological Disease.
Transposable Elements (TE) are mobile DNA elements that can replicate and insert themselves into different locations within the host genome. Their propensity to self-propagate has a myriad of consequences and yet their biological significance is not well-understood. Indeed, retrotransposons have evaded evolutionary attempts at repression and may contribute to somatic mosaicism. Retrotransposons are emerging as potent regulatory elements within the human genome. In the diseased state, there is mounting evidence that endogenous retroelements play a role in etiopathogenesis of inflammatory diseases, with a disposition for both autoimmune and neurological disorders. We postulate that active mobile genetic elements contribute more to human disease pathogenesis than previously thought
Feasibility Study of OFDM-MFSK Modulation Scheme for Smart Metering Technology
The Orthogonal Frequency Division Multiplexing based M-ary Frequency Shift
Keying (OFDM-MFSK) is a noncoherent modulation scheme which merges MFSK with
the OFDM waveform. It is designed to improve the receiver sensitivity in the
hard environments where channel estimation is very difficult to perform. In
this paper, the OFDM-MFSK is suggested for the smart metering technology and
its performance is measured and compared with the ordinary OFDM-BPSK. Our
results show that, depending on the MFSK size value (M), the Packet Error Rate
(PER) has dramatically improved for OFDM-MFSK. Additionally, the adaptive
OFDM-MFSK, which selects the best M value that gives the minimum PER and higher
throughput for each Smart Meter (SM), has better coverage than OFDM-BPSK.
Although its throughput and capacity are lower than OFDMBPSK, the connected SMs
per sector are higher. Based on the smart metering technology requirements
which imply the need for high coverage and low amount of data exchanged between
the network and the SMs, The OFDM-MFSK can be efficiently used in this
technology.Comment: 6 pages, 11 figures, ISGT Europe 201
Dispersion and the electron-phonon interaction in a single heterostructure
We investigate the electron-phonon interaction in a polar-polar single heterostructure through the use of the linear combination of hybrid phonon modes, considering the role of longitudinal optical, transverse optical and interface modes, using a continuum model that accounts for both mechanical and electrical continuity over a heterostructure interface. We discuss the use of other models for such systems, such as the bulk phonon (3DP) and dielectric continuum (DC) models, using previously developed sum-rules to explain the limitations on their validity. We find that our linear combination (LC) model gives an excellent agreement with scattering rates previously derived using the 3DP and DC models when the lattice dispersion is weak enough to be ignored, however, when there is a noticeable lattice dispersion, the LC model returns a different answer, suggesting that interface modes play a much greater part in the scattering characteristics of the system under certain conditions. We also discuss the remote phonon effect in polar/polar heterostructures
Los sitcoms como herramienta para el aprendizaje cultural en el aula de inglés
Con la llegada de la globalización y la consolidación
definitiva del inglés como lengua internacional, el
lugar de la cultura en el proceso de aprendizaje de
esta lengua también ha cambiado. De este modo,
focalizar la enseñanza en hechos culturales de
países anglófonos resulta insuficiente en el mundo
en el que vivimos, donde la amplia mayoría de las
interacciones en inglés se producen entre hablantes
no nativos. Desde un punto de vista culturalmente
descentralizado (Holliday, 2009), el desarrollo de
la competencia intercultural y la conciencia crítica
deben constituir una parte esencial del aprendizaje
de idiomas (Byram, 2014). Sin embargo, la
mayoría de los libros de texto utilizados no
promueven este aprendizaje (inter)cultural. En
este trabajo, proponemos que la televisión sea un
recurso pedagógico complementario para lograr
este objetivo. Nos hemos centrado en “sitcoms”
(comedias de situación) para elaborar una lista de
episodios que pueden ser utilizados en el entorno
de la Educación Superior para desarrollar esta
competencia cultural.With the emergence of globalization and English
becoming a lingua franca for international
communication, the place for culture in the
language learning process has shifted as well.
Thus, concentrating on cultural facts about
English-speaking countries is insufficient
for today’s world, where the vast majority of
interactions happen among non-native speakers.
From a culturally decentered standpoint
(Holliday, 2009), intercultural competence and
critical awareness constitute an essential part of
language learning (Byram, 2014). However, most
ELT textbooks do not promote complete (inter)
cultural learning. In this article, we argue that
TV can be an additional pedagogical tool to help
achieve this goal. We focus on sitcoms compiling
a list of episodes that can be used at tertiary level
to develop cultural competence
Hot phonon effects on high field transport in GaN & AlN
We have studied the effects of hot phonons on the high-field transport in GaN & AlN. The dynamics of the non-equilibrium electron-LO phonon system is studied via an ensemble Monte-Carlo code. We find that under steady-state conditions the hot-phonons cause the randomization of the electron momentum and increase their mean energy leading to diffusive heating. Average electron energies of three and two times those in the equilibrium phonon cases are found for GaN and AlN at applied fields of 100 kV/cm and 350 kV/cm respectively. The electron velocity is reduced compared to the case with equilibrium phonons at the lattice temperature. In the transient regime peak velocities reached at overshoot are reduced when non-equilibrium phonons are taken into account
A Link Quality Model for Generalised Frequency Division Multiplexing
5G systems aim to achieve extremely high data rates, low end-to-end latency
and ultra-low power consumption. Recently, there has been considerable interest
in the design of 5G physical layer waveforms. One important candidate is
Generalised Frequency Division Multiplexing (GFDM). In order to evaluate its
performance and features, system-level studies should be undertaken in a range
of scenarios. These studies, however, require highly complex computations if
they are performed using bit-level simulators. In this paper, the Mutual
Information (MI) based link quality model (PHY abstraction), which has been
regularly used to implement system-level studies for Orthogonal Frequency
Division Multiplexing (OFDM), is applied to GFDM. The performance of the GFDM
waveform using this model and the bit-level simulation performance is measured
using different channel types. Moreover, a system-level study for a GFDM based
LTE-A system in a realistic scenario, using both a bit-level simulator and this
abstraction model, has been studied and compared. The results reveal the
accuracy of this model using realistic channel data. Based on these results,
the PHY abstraction technique can be applied to evaluate the performance of
GFDM based systems in an effective manner with low complexity. The maximum
difference in the Packet Error Rate (PER) and throughput results in the
abstraction case compared to bit-level simulation does not exceed 4% whilst
offering a simulation time saving reduction of around 62,000 times.Comment: 5 pages, 8 figures, accepted in VTC- spring 201
Personality, Lifetime Earnings, and Retirement Wealth
Studies of adolescents and young adults have shown that schooling impacts economic outcomes beyond its impact on cognitive ability. Research has also shown that the personality trait of conscientiousness predicts health outcomes, academic outcomes, and divorce. Using the Big Five taxonomy of personality traits, this study examines whether non-cognitive traits are related to economic success over the life course. Examining Health and Retirement Study survey data linked to Social Security records on over 10,000 adults age 50 and over, we investigate the relationship of personality traits to economic outcomes. Controlling for cognitive ability and background variables, do more conscientious and emotionally stable adults have higher lifetime earnings, and is this due to higher annual earnings, longer work lives, or both? Do more conscientious adults save a higher proportion of their earnings for retirement, and does conscientiousness of each partner in a married couple matter? Do conscientiousness and emotional stability interact such that the effects of conscientiousness are greater among less emotionally stable adults?
The Early Promise of TBRI Implementation in Schools
The program known as Trust Based Relational Intervention® (TBRI®) began as an exploration into the detrimental behaviors of foster and adopted children placed in homes with unsuspecting caregivers who assumed their living environment would result in positive results rather than fear based emotions and behaviors. The researchers at the Karyn Purvis Institute of Child Development (KPICD) at Texas Christian University held summer camps for adopted children and through that work developed an intervention to meet the needs of children who had experienced trauma. KPICD identifies these young people as “children from hard places” (Purvis & Cross, 2005). Copeland et al (2007) reported that an estimated 68% of children in the United States have experienced some sort of trauma. This astounding statistic holds great meaning for teachers and administrators, because these children from hard places routinely manifest aggressive and undesired behaviors due to an altering of their physiology. The literature on TBRI® at this point mostly has chronicled success with families, group homes and summer camps (McKenzie, Purvis, & Cross, 2014; Howard, Parris, Neilson, Lusk, Bush, Purvis & Cross, 2014; Purvis & Cross, 2006). TBRI® has only recently been implemented in school settings. This report provides an overview of the impacts of trauma, trauma related work in schools, and the four articles published to this point related to the use of TBRI® in schools
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