Can Online Off-the-Shelf Lessons Improve Student Outcomes? Evidence from a Field Experiment

Many websites now warehouse instructional materials designed to be taught by teachers in a traditional classroom. What are the potential benefits of the new resources? We analyze an experiment in which we randomly give middle school math teachers access to existing high-quality, off-the-shelf lessons, and in some cases, support to promote their use. Teachers receiving access alone increased students’ math achievement by a marginally significant 0.06 of a standard deviation. Teachers who received access and support increased students’ math achievement by 0.09 of a standard deviation. Weaker teachers experience larger gains, suggesting that these lessons substitute for teacher skill or efforts. The online materials are more scalable and cost effective than most policies aimed at improving teacher quality, suggesting that, if search costs can be overcome, there is a real benefit to making high-quality instructional materials available to teachers on the Internet. (JEL C93, I21, J24, J45)

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A Professional Development Program for Middle School Math Teachers in Maryland

Resources for Preparing Middle School Mathematics Teachers ◽

10.5948/upo9781614443155.008 ◽

2013 ◽

pp. 59-68

Author(s):

M. Elizabeth Mayfield ◽

Christy Danko Graybeal ◽

Steven G. Krantz

Keyword(s):

Professional Development ◽

Middle School ◽

Development Program ◽

Professional Development Program ◽

Middle School Math ◽

Math Teachers ◽

Middle School Math Teachers

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Middle School Math Teachers: What Do They Need from Preservice Programs?

The Clearing House A Journal of Educational Strategies Issues and Ideas ◽

10.1080/00098659709599323 ◽

1997 ◽

Vol 71 (1) ◽

pp. 51-52 ◽

Cited By ~ 2

Author(s):

D. James Tooke

Keyword(s):

Middle School ◽

Middle School Math ◽

Math Teachers ◽

Middle School Math Teachers

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A Number and Algebra Course for Middle School Math Teachers

Resources for Preparing Middle School Mathematics Teachers ◽

10.5948/upo9781614443155.012 ◽

2013 ◽

pp. 119-132

Author(s):

Michael Mays ◽

David Miller ◽

Steven G. Krantz

Keyword(s):

Middle School ◽

Middle School Math ◽

Math Teachers ◽

Middle School Math Teachers ◽

And Algebra

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Teletinnitus Program at the VA Gulf Coast Veterans Health Care System

Perspectives on Telepractice ◽

10.1044/teles4.1.23 ◽

2014 ◽

Vol 4 (1) ◽

pp. 23-29

Author(s):

Constance Hilory Tomberlin

Keyword(s):

Health Care ◽

Patient Satisfaction ◽

Patient Care ◽

Health Care System ◽

Gulf Coast ◽

New Technology ◽

Cost Effective ◽

Veterans Health ◽

Potential Benefits ◽

Care System

There are a multitude of reasons that a teletinnitus program can be beneficial, not only to the patients, but also within the hospital and audiology department. The ability to use technology for the purpose of tinnitus management allows for improved appointment access for all patients, especially those who live at a distance, has been shown to be more cost effective when the patients travel is otherwise monetarily compensated, and allows for multiple patient's to be seen in the same time slots, allowing for greater access to the clinic for the patients wishing to be seen in-house. There is also the patient's excitement in being part of a new technology-based program. The Gulf Coast Veterans Health Care System (GCVHCS) saw the potential benefits of incorporating a teletinnitus program and began implementation in 2013. There were a few hurdles to work through during the beginning organizational process and the initial execution of the program. Since the establishment of the Teletinnitus program, the GCVHCS has seen an enhancement in patient care, reduction in travel compensation, improvement in clinic utilization, clinic availability, the genuine excitement of the use of a new healthcare media amongst staff and patients, and overall patient satisfaction.

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The Formability and Elongation of Aluminum Alloys AA5083 and AA3003 for Micro-Truss Sandwiches Manufacturing

Engineering and Technology Journal ◽

10.30684/etj.v38i9a.556 ◽

2020 ◽

Vol 38 (9A) ◽

pp. 1396-1405

Author(s):

Arwa F. Tawfeeq ◽

Matthew R. Barnett

Keyword(s):

Aluminum Alloy ◽

Strain Rate ◽

Cost Effective ◽

Tensile Tests ◽

Truss Structures ◽

High Quality ◽

Trade Off ◽

Clad Layer ◽

Higher Temperature ◽

Different Shapes

The development in the manufacturing of micro-truss structures has demonstrated the effectiveness of brazing for assembling these sandwiches, which opens new opportunities for cost-effective and high-quality truss manufacturing. An evolving idea in micro-truss manufacturing is the possibility of forming these structures in different shapes with the aid of elevated temperature. This work investigates the formability and elongation of aluminum alloy sheets typically used for micro-truss manufacturing, namely AA5083 and AA3003. Tensile tests were performed at a temperature in the range of 25-500 ○C and strain rate in the range of 2x10-4 -10-2 s-1. The results showed that the clad layer in AA3003 exhibited an insignificant effect on the formability and elongation of AA3003. The formability of the two alloys was improved significantly with values of m as high as 0.4 and 0.13 for AA5083 and AA3003 at 500 °C. While the elongation of both AA5083 and AA3003 was improved at a higher temperature, the elongation of AA5083 was inversely related to strain rate. It was concluded that the higher the temperature is the better the formability and elongation of the two alloys but at the expense of work hardening. This suggests a trade-off situation between formability and strength.

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2D-3D integration of hexagonal boron nitride and a high-κ dielectric for ultrafast graphene-based electro-absorption modulators

Nature Communications ◽

10.1038/s41467-021-20926-w ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Hitesh Agarwal ◽

Bernat Terrés ◽

Lorenzo Orsini ◽

Alberto Montanaro ◽

Vito Sorianello ◽

...

Keyword(s):

Boron Nitride ◽

Hafnium Oxide ◽

High Speed ◽

Hexagonal Boron Nitride ◽

Temperature Stability ◽

Cost Effective ◽

Fold Increase ◽

Building Blocks ◽

High Quality ◽

New Device

AbstractElectro-absorption (EA) waveguide-coupled modulators are essential building blocks for on-chip optical communications. Compared to state-of-the-art silicon (Si) devices, graphene-based EA modulators promise smaller footprints, larger temperature stability, cost-effective integration and high speeds. However, combining high speed and large modulation efficiencies in a single graphene-based device has remained elusive so far. In this work, we overcome this fundamental trade-off by demonstrating the 2D-3D dielectric integration in a high-quality encapsulated graphene device. We integrated hafnium oxide (HfO2) and two-dimensional hexagonal boron nitride (hBN) within the insulating section of a double-layer (DL) graphene EA modulator. This combination of materials allows for a high-quality modulator device with high performances: a ~39 GHz bandwidth (BW) with a three-fold increase in modulation efficiency compared to previously reported high-speed modulators. This 2D-3D dielectric integration paves the way to a plethora of electronic and opto-electronic devices with enhanced performance and stability, while expanding the freedom for new device designs.

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