Soil physics laboratory guide, by W. H. Stevenson and I. O. Schaub.

Schaub, I. O.; Stevenson, W. H.

doi:10.5962/bhl.title.43350

Cited by 5 publications

(7 citation statements)

References 0 publications

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“…Measuring the level of exhaled CO is an indicator of the subject's level of smoking, and it is well correlated with COHb levels [15,16] also shown in our laboratory with pregnant women (Venditti and Smith, unpublished data). The half-life of CO is 3 -4 hrs, therefore this test is dependent on the time elapsed since last cigarette smoked, and is less reliable for low-level smoking [17].…”

Section: Introductionsupporting

confidence: 55%

Self-reported cigarette smoking status imprecisely quantifies exposure in pregnancy

Venditti¹,

Smith

2012

OJOG

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Objective: We sought to determine the validity of self-reported smoking activity versus two quantitative measurements of tobacco exposure in pregnancy. We hypothesized that pregnant women would under-report their daily smoking amounts, due to the negative social stigmas associated with such a behavior. Methods: Cigarette-smoking and non-smoking pregnant women were recruited as part of a larger research study. Pregnant women with a singleton baby (>24 weeks) were recruited at a clinical appointment or prior to an elective caesarian section. Self-reported smoking status, including time since last cigarette, was recorded. End-tidal breath carbon monoxide (ETCO) levels and urine cotinine levels were measured and compared. Results: Both normotensive non-smoking (NTN) (n = 44) and normotensive smoking (NTS) (n = 24) pregnant women were recruited. A strong correlation was found between ETCO levels and urine cotinine measurements (r = 0.6566, p < 0.05). Self-reported smoking status in NTS was poorly correlated with ETCO levels (r = 0.5356, p < 0.05) and urine cotinine levels (r = 0.0324, P > 0.05). Conclusion: Self-reported smoking status accurately identifies women who smoke in pregnancy, but not their level of tobacco exposure. Urine cotinine or ETCO are much better quantitative measurements of nicotine and carbon monoxide, respectively, and should be measured for a more precise indicator of smoking activity. These devices will allow for better counseling and monitoring of women who are trying to quit smoking and/or who enter into smoking cessation programs

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Section: Introductionsupporting

confidence: 55%

Self-reported cigarette smoking status imprecisely quantifies exposure in pregnancy

Venditti¹,

Smith

2012

OJOG

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“…Most studies that examine parenting beliefs and practices, and the effects of these on young children’s social behaviors, use White (often middle-income) parents as the normative group without considering how Chinese parents might hold different beliefs and follow different practices (Ren & Wyver, 2014). Furthermore, the majority of those studies that have focused on Chinese parents’ socialization goals have been centered on academic achievement, as Chinese-heritage children are often found to outperform their European American counterparts across several academic domains (e.g., Mullis et al, 2007; Stevenson et al, 1993; Stevenson & Stigler, 1992). As a result, these studies have highlighted Chinese parents’ focus on children’s academic performance and their high expectations for their children around academic achievement.…”

Section: The Integrated Conceptual Framework For the Development Of A...mentioning

confidence: 99%

Examination of Chinese immigrant parents’ beliefs about children’s social development through play: A mixed methods explanatory sequential study.

Hyun¹,

McWayne²,

Guetterman³

2022

Developmental Psychology

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Currently, despite the rapid growth of the population of Chinese immigrant families and children in the United States, preschool-aged Chinese-heritage children are an underrepresented group in research. The overarching purpose of this project was to provide a deeper understanding of Head Start Chinese immigrant parents’ beliefs about children’s social-emotional development, the value of play during the preschool period, and the potential role of cultural orientation. The study followed the steps of a mixed methods explanatory sequential design. First, using quantitative data collected from 213 primary caregivers, the study employed a person-centered lens to explore profiles of parents’ cultural orientations and beliefs about play and academics in preschool to better understand the association of these profiles to children’s social competencies. Next, 34 primary caregivers from the quantitative study participated in in-depth, focus group discussions to further explore parents’ perceptions of children’s social behaviors, cultural adjustment experiences, and their perceptions about U.S. preschools. Four reliable profiles were resolved quantitatively and showed within-group variations in patterns of Chinese immigrant parents’ beliefs and cultural orientations that related differentially to children’s social-emotional competencies as evidenced within peer play at home. Qualitative findings corroborated and elaborated the quantitative findings. These results underscored the importance of engaging with Chinese immigrant parents to inform research and program practices.

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“…Laser Doppler velocimetry is an attractive method of modulating the light scatter signal without modulating the noise components of the background signal (5). In this light scatter technique, a laser beam is split into two nearly equal intensity beams which are recombined at the focus of a lens, The fringe spacing is given by…”

Section: Literature Citedmentioning

confidence: 99%

“…where X is the wavelength of light in the medium and 9 is the intersection angle of the two interfering beams. The fringe region is an ellipsoid of revolution, with major axis given by 2V2o>/sin (8/2) and with minor axis given by 21/,2u)/cos (8/2) (5). At the intersection of the two laser beams, the light intensity is given by the product of a Gaussian function times a sinusoidal function for the intensity fringes.…”

Section: Literature Citedmentioning

confidence: 99%

Laser Doppler velocimetry for particle size determination by light scatter within the sheath flow cuvette

Zarrin¹,

Bornhop²,

Dovic̀hi³

1987

Anal. Chem.

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Soil physics laboratory guide, by W. H. Stevenson and I. O. Schaub.

Cited by 5 publications

References 0 publications

Self-reported cigarette smoking status imprecisely quantifies exposure in pregnancy

Self-reported cigarette smoking status imprecisely quantifies exposure in pregnancy

Examination of Chinese immigrant parents’ beliefs about children’s social development through play: A mixed methods explanatory sequential study.

Laser Doppler velocimetry for particle size determination by light scatter within the sheath flow cuvette

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