Capillary flow in sacrificially etched nanochannels     

Hamblin MN  Hawkins AR  Murray D  Maynes D  Lee ML  Woolley AT  Tolley HD 《Biomicrofluidics》2011,5(2):21103

Planar nanochannels are fabricated using sacrificial etching technology with sacrificial cores consisting of aluminum, chromium, and germanium, with heights ranging from 18 to 98 nm. Transient filling via capillary action is compared against the Washburn equation [E. W. Washburn, Phys. Rev. 17, 273 (1921)], showing experimental filling speeds significantly lower than classical continuum theory predicts. Departure from theory is expressed in terms of a varying dynamic contact angle, reaching values as high as 83° in channels with heights of 18 nm. The dynamic contact angle varies significantly from the macroscopic contact angle and increases with decreasing channel dimensions.  相似文献   

Dial-in access to CD-ROM databases: beyond the local area network.     

P W Onsi  J A Capodagli  D K Hawkins 《Bulletin of the Medical Library Association》1992,80(4):376-379

Although it has meant additional work, CDLink has enhanced the productivity and effectiveness of the library's public services program. CDLink enables the library to offer dial-in access to databases, either in CD-ROM or other MS-DOS formats. The VAX MS-DOS connection is a cost-effective way to combine the benefits of remote access and multiple simultaneous use. From the user's perspective, CDLink provides free, twenty-four-hour remote access to databases in a friendly, menu-driven environment. For the library staff, the CDLink service represents the achievement of a long-awaited goal.  相似文献   

THE STUDENT–TEACHER RELATIONSHIP QUALITY OF ABUSED CHILDREN          下载免费PDF全文

Jenna Montgomery Armstrong  Mary E. Haskett  Amy L. Hawkins 《Psychology in the schools》2017,54(2):142-151

Considering the association between children's quality of relationships with teachers and their academic adjustment, information pertaining to how abused children are functioning in their relationships with teachers could be useful in promoting their academic success—yet there has been limited research in this area. The purpose of this study was to use cluster analyses to explore within‐group differences in relational schemas and quality of student–teacher relationships for 70 abused children. Two clusters of abused children emerged, and as hypothesized, there were significant differences in student–teacher relationships for the two clusters. The cluster with more positive relational schemas had less conflict and less dependency reported by their teachers compared to the cluster with negative relational schemas. However, there were no differences between the clusters in terms of closeness with teachers. Implications for practice in schools are discussed.  相似文献   

Learning and study strategies correlate with medical students' performance in anatomical sciences          下载免费PDF全文

Mohammed K. Khalil  Shanna E. Williams  H. Gregory Hawkins 《Anatomical sciences education》2018,11(3):236-242

Much of the content delivered during medical students' preclinical years is assessed nationally by such testing as the United States Medical Licensing Examination^® (USMLE^®) Step 1 and Comprehensive Osteopathic Medical Licensing Examination^® (COMPLEX‐USA^®) Step 1. Improvement of student study/learning strategies skills is associated with academic success in internal and external (USMLE Step 1) examinations. This research explores the strength of association between the Learning and Study Strategies Inventory (LASSI) scores and student performance in the anatomical sciences and USMLE Step 1 examinations. The LASSI inventory assesses learning and study strategies based on ten subscale measures. These subscales include three components of strategic learning: skill (Information processing, Selecting main ideas, and Test strategies), will (Anxiety, Attitude, and Motivation) and self‐regulation (Concentration, Time management, Self‐testing, and Study aid). During second year (M2) orientation, 180 students (Classes of 2016, 2017, and 2018) were administered the LASSI survey instrument. Pearson Product‐Moment correlation analyses identified significant associations between five of the ten LASSI subscales (Anxiety, Information processing, Motivation, Selecting main idea, and Test strategies) and students' performance in the anatomical sciences and USMLE Step 1 examinations. Identification of students lacking these skills within the anatomical sciences curriculum allows targeted interventions, which not only maximize academic achievement in an aspect of an institution's internal examinations, but in the external measure of success represented by USMLE Step 1 scores. Anat Sci Educ 11: 236–242. © 2017 American Association of Anatomists.  相似文献   

What is The International Statistical Institute?     

Anne Hawkins 《Teaching Statistics》1999,21(2):34-35

This is the second of a short series of articles briefly describing the organisations that sponsor Teaching Statistics.  相似文献   

LD and delinquency: rethinking the "link"     

Malmgren K  Abbott RD  Hawkins JD 《Journal of learning disabilities》1999,32(3):194-200

Longitudinal data from a 7-year prospective study was examined to investigate whether the presence of learning disabilities (LD) increases a youth's risk of becoming a juvenile delinquent. The sample included 515 students enrolled in the fifth grade in the fall of 1985, 51 (9.9%) of whom were youth with LD. Self-report data on delinquent activity were collected in the spring of 1993. Official court records were obtained for the years 1985 through 1992. Hierarchical multiple regression analyses were performed using a block of three demographic variables (gender, ethnicity, and socioeconomic status) as predictors in the first step and including LD status in a second step. Seven separate analyses were performed, using different measures of delinquency as criterion variables. In no case did LD status account for a significant portion of unique variance in the delinquency variables when the demographic variables were controlled for. The results of this study did not confirm the presence of a direct relationship between LD and delinquency and suggest that the finding of a direct relationship in other studies may have been due to confounding of the LD status with age, ethnicity, or socioeconomic status.  相似文献   

Mandatory notification training for suspected child abuse and neglect in South Australian schools     

Hawkins R  McCallum C 《Child abuse & neglect》2001,25(12):1603-1625

OBJECTIVE: The present study provides the first empirical investigation of the South Australian Education Department Mandated Notification Training program. This program, which has been available since 1989, was developed to prepare educators and other mandated reporters to fulfill their reporting obligations for suspected child abuse and neglect. The main objective of the present study was to investigate whether Mandated Notification Training achieved its stated aims. METHOD: A three-sample independent groups design was used. A survey was responded to by 41 teachers and school personnel who had recently completed training, 31 people who had not completed training, and 73 people who had completed training some years previously. RESULTS: The training program increased participants' confidence in their ability to recognize the indicators of abuse, their awareness of their reporting responsibilities, their knowledge of what constitutes reasonable grounds for reporting, and of how to respond appropriately to a child's disclosure of abuse. Training also increased participants' acceptance of the incidence and seriousness of child abuse. CONCLUSIONS: The South Australian Education Department Mandated Notification Training is successful in achieving its stated aims. For some teachers, there is clearly a mismatch between the level of evidence required by law for reporting to occur and the level teachers expect to satisfy their own personal need for confidence in initiating the serious step of a child abuse report. This mismatch remains after training and probably contributes to the significant occurrence of nonreporting or discretionary reporting reported in the literature.  相似文献   

Thin film electro-osmotic pumps for biomicrofluidic applications     

John M. Edwards  IV  Mark N. Hamblin  Hernan V. Fuentes  Bridget A. Peeni  Milton L. Lee  Adam T. Woolley    Aaron R. Hawkins 《Biomicrofluidics》2007,1(1)

Electro-osmotic flow (EOF) pumps are attractive for fluid manipulation in microfluidic channels. Open channel EOF pumps can produce high pressures and flow rates, and are relatively easy to fabricate on-chip or integrate with other microfluidic or electrical components. An EOF pump design that is conducive to on-chip fabrication consists of multiple small channel arms feeding into a larger flow channel. We have fabricated this type of pump design using a thin film deposition process that avoids wafer bonding. We have evaluated pumps fabricated on both silicon and glass substrates. Consistent flow rate versus electric field were obtained. For the range of 40–400 V, flow rates of 0.19–2.30 μL∕min were measured. Theoretical calculations of pump efficiency were made, as well as calculations of the mechanical power generated by various pump shapes, to investigate design parameters that should improve future pumps.  相似文献   

A study of emerging teacher practices in internet-based lesson plan development     

Robyn Battle  Isabel Hawkins 《Journal of Science Education and Technology》1996,5(4):321-342

In this paper we describe two aspects of an Internet-based lesson plan development project called Science On-Line-Earth and Space Science for the Classroom. First, we discuss the design of the Science On-Line (SOL) Project, which focuses on building a community of practice, appropriate task and setting, and contact with the scientific workplace. Second, we examine strategies teachers used as they approached the task of creating Internet-based science lesson plans for the World Wide Web. Based on the analysis of data gathered during the various project phases, results show that the teacher-developed strategies have varying degrees of effectiveness in facilitating Internet-based lesson plan design, information-gathering, and organization. We describe how the strategies began to evolve into formulated practices for Internet-based lesson development within the SOL teacher community. The SOL investigation develops a case study of the strategies and emerging practices in the context of the creation and pilot-testing of Internet-based lesson plans. This case study may serve as an exemplar of tested Internet-based lesson development strategies and practices for the educational community.  相似文献   

Teaching Skills Performance of Student Teachers in Natural Classrooms Prior to Skills Training     

Warren Hawkins  Barbara Sager 《Asia-Pacific Journal of Teacher Education》1977,5(3):201-207

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