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Institution

Boston College

EducationBoston, Massachusetts, United States
About: Boston College is a education organization based out in Boston, Massachusetts, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 9749 authors who have published 25406 publications receiving 1105145 citations. The organization is also known as: BC.


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Journal ArticleDOI
TL;DR: The MGRS demonstrates that healthy children from around the world who are raised in healthy environments and follow recommended feeding practices have strikingly similar patterns of growth, and the WHO standards provide a better tool to monitor the rapid and changing rate of growth in early infancy.
Abstract: The growth pattern of healthy breastfed infants deviates to a significant extent from the NCHS/WHO international reference. In particular, this reference is inadequate because it is based on predominantly formula-fed infants, as are most national growth charts in use today. The WHO multicentre growth reference study (MGRS), aimed at describing the growth of healthy breastfed infants living in good hygiene conditions, was conducted between 1997 and 2003 in 6 countries from diverse geographical regions: Brazil, Ghana, India, Norway, Oman and the United States. The study combined a longitudinal follow-up of 882 infants from birth to 24 months with a cross-sectional component of 6669 children aged 18-71 months. In the longitudinal follow-up study, mothers and newborns were enrolled at birth and visited at home a total of 21 times at weeks 1, 2, 4 and 6; monthly from 2-12 months; and bimonthly in the 2nd year. The study populations lived in socioeconomic conditions favorable to growth. The individual inclusion criteria for the longitudinal component were: no known health or environmental constraints to growth, mothers willing to follow MGRS feeding recommendations (i.e., exclusive or predominant breastfeeding for at least 4 months, introduction of complementary foods by 6 months of age and continued breastfeeding to at least 12 months of age), no maternal smoking before and after delivery, single-term birth and absence of significant morbidity. Term low-birth-weight infants were not excluded. The eligibility criteria for the cross-sectional component were the same as those for the longitudinal component with the exception of infant feeding practices. A minimum of 3 months of any breastfeeding was required for participants in the study's cross-sectional component. Weight-for-age, length/height-for-age, weight-for-length/height and body mass index-for-age percentile and Z-score values were generated for boys and girls aged 0-60 months. The full set of tables and charts is presented on the WHO website (www.who.int/childgrowth/en), together with tools such as software and training materials that facilitate their application. The WHO child growth standards were derived from children who were raised in environments that minimized constraints to growth, such as poor diets and infection. In addition, their mothers followed healthy practices such as breastfeeding their children and not smoking during and after pregnancy. The standards depict normal human growth under optimal environmental conditions and can be used to assess children everywhere, regardless of ethnicity, socioeconomic status and type of feeding. The standards explicitly identify breastfeeding as the biological norm and establish the breastfed child as the normative model for growth and development. They have the potential to significantly strengthen health policies and public support for breastfeeding. The pooled sample from the 6 participating countries allowed the development of a truly international reference that underscores the fact that child populations grow similarly across the world's major regions when their health and care needs are met. It also provides a tool that is timely and appropriate for the ethnic diversity seen within countries and the evolution toward increasingly multiracial societies in the Americas and Europe as elsewhere in the world. The WHO standards provide a better tool to monitor the rapid and changing rate of growth in early infancy. They also demonstrate that healthy children from around the world who are raised in healthy environments and follow recommended feeding practices have strikingly similar patterns of growth.

266 citations

Journal ArticleDOI
Abstract: The size and crystal orientation of Sn grains in Pb-free, near eutectic Sn-Ag-Cu solder joints were examined. A clear dependence of the thermomechanical fatigue response of these solder joints on Sn grain orientation was observed (Sn has a body centered tetragonal crystal structure). Fabricated joints tend to have three orientations in a cyclic twin relationship, but among the population of solder balls, this orientation triplet appears to be randomly oriented. In thermally cycled joints, solder balls with dominant Sn grains having the particular orientation with the c-axis nearly parallel to the plane of the substrate were observed to fail before neighboring balls with different orientations. This results from the fact that the coefficient of thermal expansion of Sn in the basal plane (along the alpha-axis) is half the value along the c-axis; joints observed to be damaged had the maximum coefficient of thermal expansion mismatch between solder and substrate at the joint interface, as well as a tensile stress modes during the hot part of the thermal cycle. Localized recrystallization was observed in regions of maximum strain caused by differential expansion conditions, and its connection with crack nucleation is discussed.

266 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the use of block-building interventions to develop spatial-reasoning skills in kindergartners and found that storytelling provides an effective context for teaching spatial content, teaching block building develops wider spatial skills, and 3-dimensional mental rotation tasks show a male advantage.
Abstract: This study investigated the use of block-building interventions to develop spatial-reasoning skills in kindergartners. Two intervention conditions and a control condition were included to determine, first, whether the block building activities themselves benefited children's spatial skills, and secondly, whether a story context further improved learning. Spatial measures included: spatial visualization, mental rotation, and block building. Results showed: for block building, interventions within a story context improved performance compared to the other two conditions. For spatial visualization, both types of block-building interventions improved performance compared to the control condition. Findings suggest: (1) storytelling provides an effective context for teaching spatial content, (2) teaching block building develops wider spatial skills, and (3) 3-dimensional mental rotation tasks show a male advantage in kindergartners.

266 citations

Journal ArticleDOI
TL;DR: In this article, the authors show how both technological and competitive risks affect the timing of private and initial public offerings in an emerging industry, and how the value of investors' proprietary information is greater in private than in public offerings.
Abstract: This article shows how both technological and competitive risks affect the timing of private and initial public offerings in an emerging industry. Early private financing occurs in industries that are perceived to be risky, with high development costs and low probability of being displaced by technologically superior rivals. Early public financing occurs in industries perceived to be viable, with low development costs and low probability of displacement. Due to feedback effects between financial and product markets, the value of investors' proprietary information is greater in private than in initial public offerings. This has implications for underpricing. Article published by Oxford University Press on behalf of the Society for Financial Studies in its journal, The Review of Financial Studies.

266 citations

Journal ArticleDOI
TL;DR: In this paper, the phase space for three-phonon scattering events in several group IV, III-V and II-VI semiconductors employing an adiabatic bond charge model was analyzed.
Abstract: We present calculations of the phase space for three-phonon scattering events in several group IV, III–V and II–VI semiconductors employing an adiabatic bond charge model to accurately represent the phonon dispersions. We demonstrate that this phase space varies inversely with the measured lattice thermal conductivities of these materials over a wide range of temperatures where three-phonon scattering is the dominant mechanism for scattering phonons. We find that this qualitative relationship is robust in spite of variations in material parameters between the semiconductors. Anomalous behavior occurs in three III–V materials that have large mass differences between constituent elements, which we explain in terms of the severely restricted three-phonon phase space arising from the large gap between acoustic and optic phonon branches.

265 citations


Authors

Showing all 9922 results

NameH-indexPapersCitations
Eric J. Topol1931373151025
Gang Chen1673372149819
Wei Li1581855124748
Daniel L. Schacter14959290148
Asli Demirguc-Kunt13742978166
Stephen G. Ellis12765565073
James A. Russell124102487929
Zhifeng Ren12269571212
Jeffrey J. Popma12170272455
Mike Clarke1131037164328
Kendall N. Houk11299754877
James M. Poterba10748744868
Gregory C. Fu10638132248
Myles Brown10534852423
Richard R. Schrock10372443919
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202398
2022250
20211,282
20201,275
20191,082
20181,058