A fluorescence based method for the quantification of surface functional groups in closed micro- and nanofluidic channels     

Yu Wang  Rachel D. Lowe  Yara X. Mejia  Holger Feindt  Siegfried Steltenkamp  Thomas P. Burg 《Biomicrofluidics》2013,7(2)

Surface analysis is critical for the validation of microfluidic surface modifications for biology, chemistry, and physics applications. However, until now quantitative analytical methods have mostly been focused on open surfaces. Here, we present a new fluorescence imaging method to directly measure the surface coverage of functional groups inside assembled microchannels over a wide dynamic range. A key advance of our work is the elimination of self-quenching to obtain a linear signal even with a high density of functional groups. This method is applied to image the density and monitor the stability of vapor deposited silane layers in bonded silicon/glass micro- and nanochannels.  相似文献   

Differences in the Intensity and Duration of Adolescents' Sports and Exercise Across Physical and Social Environments     

Genevieve Fridlund Dunton  David Berrigan  Rachel Ballard-Barbash  Frank Perna  Barry I. Graubard  Audie A. Atienza 《Research quarterly for exercise and sport》2013,84(3):376-382

We used data from the American Time Use Survey (years 2003–06) to analyze whether the intensity and duration of high school students' (ages 15–18 years) sports and exercise bouts differed across physical and social environments. Boys' sports and exercise bouts were more likely to reach a vigorous intensity when taking place at school and with friends/acquaintances/other people; whereas girls' sports and exercise bouts were more likely to reach a vigorous intensity when outdoors and alone. For boys and girls, bout durations were greater at school and with friends/acquaintances/other people than in other environments. Overall, environmental influences on the intensity but not duration of sports and exercise bouts appear to differ between boys and girls.  相似文献   

An investigation of a novel three-dimensional activity monitor to predict free-living energy expenditure     

James Carter  David Wilkinson  Sam Blacker  Mark Rayson  James Bilzon  Rachel Izard 《Journal of sports sciences》2013,31(6):553-561

Abstract

The aim of this study was to assess the capability of the 3dNX? accelerometer to predict energy expenditure in two separate, free-living cohorts. Twenty-three adolescents and 14 young adults took a single dose of doubly labelled water and wore a 3dNX? activity monitor during waking hours for a 10-day period while carrying out their normal routines. Multiple linear regression with backward elimination was used to establish the strength of the associations between various indices of energy expenditure, physical activity counts, and anthropometric variables. 3dNX? output accounted for 27% and 35% of the variance in the total energy expenditure of the adolescent and young adult cohort, respectively. The explained variance increased to 78%, with a standard error of estimate of 7%, when 3dNX? output was combined with body composition variables. The 3dNX? accelerometer can be used to predict free-living daily energy expenditure with a standard error of estimate of 1.65 MJ in adolescents and 1.52 MJ in young adults. The inclusion of anthropometric variables reduces the error to approximately 1 MJ. Although it remains to cross-validate these models in other populations, early indications suggest that the 3dNX? provides a useful method of predicting energy expenditure in free-living individuals.  相似文献   

Engaging suppliers in CRM: The role of justice in buyer–supplier relationships     

Rachel Duffy  Andrew Fearne  Sue Hornibrook  Karise Hutchinson  Andrea Reid 《International Journal of Information Management》2013

Given the crucial role of suppliers in collaborative supply chains, it is surprising that little attention has been paid to the nature and management of supplier relationships in the implementation of a retailer's Customer Relationship Management (CRM) strategy. To address this gap in the extant literature, the theory of organizational justice is used to explore the extent to which perceived fairness in buyer–supplier relationships supports or inhibits supplier engagement with the CRM process. The rationale is that suppliers who feel fairly treated by key retail customers are more likely to invest resources in the acquisition and use of data central to the retailer's CRM strategy. By empirically testing a conceptual model linking downstream CRM to upstream SRM, the results provide evidence to indicate that customer data use is significantly influenced by perceptions of fairness, particularly with respect to the distribution of rewards, and the transparency of decision-making processes. As a key criticism of CRM centers upon the failure of organizations to exploit the full potential of customer data, the results highlight the usefulness of understanding the relational linkages between buyers and suppliers and the consequential behavior of suppliers in terms of engagement with customer data vital to the success of retailers’ CRM strategies.  相似文献   

‘Who’s that girl sitting with the boys?’: negotiating researcher identity in fieldwork with adolescent boys     

Rachel Ann O’Brien 《Sport, Education and Society》2013,18(9):954-966

ABSTRACT

The aim of this paper is to discuss the negotiation and performance of researcher identities while conducting fieldwork. It draws on a larger study of masculinities, health and physical education, and sport in an elite boys’ school to analyse the researcher’s role as a female ethnographer in the world of health and physical education in boys’ schooling. Using data drawn from field notes, reflections, and observations from six months of fieldwork at the school, this paper joins a growing body of research, which attests to the importance of making known the ‘hidden histories’ of qualitative research. The significance of this paper is twofold. Firstly, it lies in recognising the details of how researchers position themselves in the field, negotiate and renegotiate their identities, and the significance of social dynamics and relationships to this process. Secondly, it raises awareness of the implications of negotiating researcher identities and embodied experiences in the field and suggests this analysis should become more public in qualitative research.  相似文献   

Preparing Minority Adolescents to Blend Work and Family Roles: Increasing Work-Family Conflict Management Self Efficacy     

Rachel Gali Cinamon 《International journal for the advancement of counseling》2006,28(1):79-94

Ethnic identity, information about the world of work, and mastery in specific career skills crucially impact the process of career development among minority adolescents. Identity and conflict management skills also affect one of the major stressors experienced by employees today: the work-family conflict. This paper presents a culturally appropriate career intervention program for increasing Israeli Arab adolescents’ self-efficacy to manage work and family roles, and feedback from 15 participants in a preliminary pilot intervention. The program comprised three units: identity exploration, information, and skill transfer. The intervention was grounded in the career development literature on minorities, on work-family conflict research, and on social cognitive career theory. The proposed strategy also included process variables comprising critical career intervention components. The program is seen as having potential for being implemented in other cultural contexts.  相似文献   

Socio-cultural differences between Jewish and Arab teachers’ attitudes toward career education in Israel     

Hanoch Flum  Rachel Gali Cinamon 《International Journal for Educational and Vocational Guidance》2006,6(2):123-140

Teachers’ attitudes towards career education play a crucial role in the successful implementation of relevant career related programs in school curriculum. In the current study, attitudes towards career education are investigated among 202 Israeli Arabs and 136 Israeli Jewish teachers. Results demonstrated similarity in the general pattern of ranking of importance of career education goals, but significant differences emerged in relation to a number of issues (e.g. self-knowledge, familiarity with range of occupation, experience with choice making). Differences are discussed as a reflection of diverse world-views, a disparity between majority and minority status and a difference in social structure.  相似文献   

Storybook writing in first grade     

Rachel Hertz-Lazarowitze 《Reading and writing》2004,17(3):267-299

Research literature on writingstorybooks overlooks first graders. This ispuzzling as children enter first grade havingemergent literacy, in reading, writing, andstory composition. It may reflect the belief that at thisage children should learn to read and write(conventionally) as the curriculum demands,while elaborate writing is assumed be taughtand developed in higher grades. This study investigated story writing by Arab(N = 184) and Jewish (N = 321) first graders inIsrael. The children were presented with fourrelated pictures, asked to paste them in thesequence of their choice in a booklet, and thento write a narrative in their first language(Arabic or Hebrew). Writing the storybook wasperceived as a space for literacy development,and was tested in the contextof two instruction methods: Success For All(SFA) and whole-class Active Learning (AL). Theclasses were observed and teachers wereinterviewed on writing instruction.Nineteen categories of writing yieldedthree clusters–factors: book print awareness,writing conventions, and story quality. Thesethen served as measures for writing outcomes. Jewish and Arab children in SFA achieved higherscores than AL students; the Jews were higherthan the Arabs on most categories, but theestimate gain was highest for Arabs in SFA. The effect of SFA was highest for at-riskJewish students and lowest for at-risk Arabstudents. The results are discussed against thelinguistic and cultural background of the twogroups and in respect of their implications forwriting instruction in a bilingual context.  相似文献   

Role salience and anticipated work--family relations among young adults with and without hearing loss     

Cinamon RG  Most T  Michael R 《Journal of deaf studies and deaf education》2008,13(3):351-361

This study examined the effect of hearing status on role salience and anticipated work-family relations among 101 unmarried young adults aged 20-33 years: 35 with hearing loss (19 hard of hearing and 16 deaf) and 66 hearing. Participants completed the Life Role Salience scale, anticipated conflictual relations scale, anticipated facilitory relations scale, and a background questionnaire. The deaf participants demonstrated a significantly higher level of commitment to work but anticipated the significantly lowest level of conflict. Hearing status was a significant variable in predicting anticipated conflictual relations among all participants. Mode of communication was a significant predictor of conflictual relations among the hearing loss group. Implications for theory and practice were discussed.  相似文献   

Singing our song: the affordances of singing in an intergenerational,multimodal literacy programme          下载免费PDF全文

Rachel Heydon  Lori McKee  Susan O'Neill 《Literacy》2018,52(3):128-136

This exploratory case study examined the affordances of singing as a multimodal literacy practice within ensembles that featured art, singing and digital media produced in an intergenerational programme that served a class of kindergarten children and community elders. The programme that was set up by the study in collaboration with a rural school and elders' organisation saw participants meet one afternoon a week for most of a school year. Study questions concerned the meaning making and relationship‐building opportunities afforded to the participants as they worked through chains of multimodal projects. Data were collected using ethnographic tools in an elders' home where the projects were completed and in the kindergarten where project content and tools were introduced to the children and extended by the classroom teacher. Themes were identified through the juxtaposition of data in relation to the literature and study questions. Results indicate that singing provided opportunities for participants to form relationships and make meaning as a group while combining modes. Study findings foreground the communicative power of singing and suggest how singing, when viewed through a multimodal lens, might be a potent tool for multimodal literacy learning.  相似文献