1,495 research outputs found
The impact of sound field systems on learning and attention in elementary school classrooms
No full textPurpose: An evaluation of the installation and use of sound field systems (SFS) was carried out to investigate their impact on teaching and learning in elementary school classrooms. Methods: The evaluation included acoustic surveys of classrooms, questionnaire surveys of students and teachers and experimental testing of students with and without the use of SFS. Students ’ perceptions of classroom environments and objective data evaluating change in performance on cognitive and academic assessments with amplification over a six month period are reported. Results: Teachers were positive about the use of SFS in improving children’s listening and attention to verbal instructions. Over time students in amplified classrooms did not differ from those in nonamplified classrooms in their reports of listening conditions, nor did their performance differ in measures of numeracy, reading or spelling. Use of SFS in the classrooms resulted in significantly larger gains in performance in the number of correct items on the nonverbal measure of speed of processing and the measure of listening comprehension. Analysis controlling for classroom acoustics indicated that students ’ listening comprehension score
Packet: BlueCross BlueShield of Florida – Developing. Nurturing. Maintaining: Relationships
No full textContains: Open Letter from Reneé Finley re: Blue Cross and Blue Shield of Florida’s Alliance Management Program, Booklet: Alliance Management Procedures More Successful Outcomes, Article: Boehm, Elizabeth W. “Forrester’s Top 10 Healthcare Predictions for 2005.” Trends, Article: Weiss, Jeff and Jonathan Hughes. “Want Collaboration? Accept—and Actively Manage—Conflict.” Harvard Business Review, Article: Ertel, Danny. “Getting Past Yes: Negotiating as of Implementation Mattered.” Harvard Business Review, Article: Booth, Bridget and Matt McCredie. “Taking steps toward ‘Getting to Yes’ at Blue Cross and Blue Shield of Florida.” Academy of Management Executive, Vol. 18, No. 3
A state-of-art review on development and progress of backfill grouting materials for shield tunneling
No full textBackfill grouting plays a vital role in shield tunneling. This paper aims to present a comprehensive review of the development and progress of backfill grouting materials specifically designed for shield tunneling. Initially, the various components of grouts, such as pozzolanic materials, filling fine aggregates, and chemical additives, are introduced and discussed in detail. Subsequently, this study investigates critical properties including workability, mechanical properties, and durability of the grouts. Additionally, the principal factors influencing the properties are summarized, along with recommended ranges for specific geological conditions. Furthermore, the paper elucidates the diffusion mechanism of grouting mortars by presenting the current grouting models employed in shield tunneling. Recent advancements in grouting materials are extensively studied and extended, offering new perspectives for future grouting technology in shield tunneling. This study provides valuable insights into overcoming the existing challenges associated with shield tunnel grouting and promoting the evolution of current grouting materials.Geo-engineerin
Magnetic shield effect simulation of superconducting film shield covering directly coupled HTS dc-SQUID magnetometer
No full textAn HTS SQUID is a high sensitive magnetic sensor. In recent years, the HTS SQUID is widely used in various applications. In some applications, high robustness with respect to magnetic noise is required to realize stable operation at outside of a magnetic shielding room. The target of this paper is a directly coupled HTS dc-SQUID magnetometer. To enhance the robustness of the SQUID magnetometer, use of a superconducting thin film shield has been proposed. The magnetic field directly penetrating the SQUID ring causes the change of the critical current of Josephson junction, and then the SQUID magnetometer transitions into inoperative state. In order to confirm the magnetic shield effect of the superconducting film shield, electromagnetic field simulation with 3D edge finite element method was performed. To simulate the high temperature superconductor, E-J characteristics and c-axis anisotropy are considered. To evaluate the effect of the superconducting film shield, an external magnetic field which is supposed to be a magnetic noise is applied. From the simulation results, the time transition of the magnetic flux penetrating the SQUID ring is investigated and the effect of the superconducting film shield is confirmed. The amplitude of the magnetic flux penetrating the SQUID ring can be reduced to about one-sixth since the superconducting film shield prevents the magnetic noise from directly penetrating the SQUID ring
On the effects of the TBM-shield body articulation on tunnelling in soft soil
No full textWhen a Tunnel Boring Machine (TBM) is driven in soft soil, the TBM-shield constantly interacts with the surrounding soil profile excavated by the cutting wheel. The interaction pattern of shield-soil interface displacements determines compression and extension sectors in the surrounding soil. Soil compression is generated when the shield displaces the excavated profile in outward direction; soil extension happens when the shield fits inside that profile. This aspect of TBM behaviour, referred to as shield-soil kinematical interaction, has been demonstrated in a recent study investigating the monitoring data from the Hubertus tunnel in The Hague. The TBM used at the Hubertus tunnel was not equipped with a shield-body articulation. The articulation, designed to limit the undesired shield-soil interactions of the kind described, was present in the TBMs used at the North-South metro line in Amsterdam. This study aims to quantify the consequences of using a shield articulation in terms of shield-soil kinematical interactions. The study, comparing the results from the Hubertus and the North-South line tunnels, revealed remarkable differences, although other discriminating aspects have to be accounted for. The fundamental understanding of the kinematical interactions is crucial to building reliable numerical models for TBM driving in soft soilGeoscience & EngineeringCivil Engineering and Geoscience
Acoustical barriers in classrooms: the impact of noise on performance in the classroom
No full textThere is general concern about the levels of noise that children are exposed to in classroom situations. We report the results of a study that explores the effects of typical classroom noise on the performance of primary school children on a series of literacy and speed tasks. One hundred and fifty eight children in six Year 3 classes participated in the study. Classes were randomly assigned to one of three noise conditions. Two noise conditions were chosen to reflect levels of exposure experienced in urban classrooms (Shield & Dockrell, 2004): noise by children alone, that is classroom–babble, and babble plus environmental noise, babble and environmental. Performance in these conditions was compared with performance under typical quiet classroom conditions or base. All analyses controlled for ability. A differential negative effect of noise source on type of task was observed. Children in the babble and environmental noise performed significantly worse than those in the base and babble conditions on speed of processing tasks. In contrast, performance on the verbal tasks was significantly worse only in the babble condition. Children with special educational needs were differentially negatively affected in the babble condition. The processes underlying these effects are considered and the implications of the results for children’s attainments and classroom noise levels are explored
Noise in open plan classrooms in primary schools: a review
No full textThis paper presents a review of research carried out in the past 40 years into various aspects of noise in open plan
classrooms. The emergence of open plan classroom design in response to progressive educational reforms is discussed. A
limited amount of evidence of the effects of noise in open plan classrooms is presented. Surveys of both background and
intrusive noise levels in open plan classrooms are summarized and compared. Differences between noise levels in open
plan and enclosed classrooms are also considered. Recommended noise limits and acoustic design criteria for open plan
classrooms are discussed, together with some current international standards. The paper concludes with a discussion of
appropriate noise control measures to reduce noise and maximize speech intelligibility and speech privacy in open plan
classrooms
Influence of Magnetic Property of Ferromagnetic Shield on High Field Magnet Analysis
No full textIn this paper, an influence of a magnetic property of a ferromagnetic shield on design of a high field magnet, which generates high magnetic field with high homogeneity, such as NMR and MRI, is described. The NMR and MRI magnets often need the magnetic shield to protect an environment and to reduce a stray magnetic field. An iron shield used as a general magnetic shield typically has a nonlinear magnetic property. In magnetic analysis for the magnet design, we have to take into account the nonlinearity of the magnetic property of iron to compute the accurate magnetic field, since the ferromagnetic shield is exposed to so high magnetic field. That is, the iron is saturated in high magnetic field. So far the design of the high field magnets with the ferromagnetic shield exposed to over 2 T has been less reported. Recently, it was reported that the nonlinear magnetic properties of iron were measured at high magnetic fields over 2 T. The difference among the magnetic fields of the high field magnets with the ferromagnetic shield, computed by the finite element method with a few magnetization curves, is investigated
Newsmen\u27s Shield Laws and Subpoenas: California\u27s Farr and the Fresno Four
No full textThe author discusses the impact of the Farr and Fresno Four decisions on the California Newsmen\u27s Shield Law, Evidence Code § 1070. First the author discusses the history of shield laws, tracing the competing concerns with the newsman\u27s right to know and the fair administration\u27 of justice. He uses this background as a means of analyzing the meaning and scope of § 1070. Then the author turns\u27to the specific decisions in Farr and the Fresno Four, analyzing their impact on the shield law. He concludes with a look at the proposed constitutional amendment to reverse the results in the two decisions
Newsmen\u27s Shield Laws and Subpoenas: California\u27s Farr and the Fresno Four
No full textThe author discusses the impact of the Farr and Fresno Four decisions on the California Newsmen\u27s Shield Law, Evidence Code § 1070. First the author discusses the history of shield laws, tracing the competing concerns with the newsman\u27s right to know and the fair administration\u27 of justice. He uses this background as a means of analyzing the meaning and scope of § 1070. Then the author turns\u27to the specific decisions in Farr and the Fresno Four, analyzing their impact on the shield law. He concludes with a look at the proposed constitutional amendment to reverse the results in the two decisions
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