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📅   Fri July 28, 2017 – National Edition

Once complete, the rehabilitated Lost Creek Dam is estimated to withstand potential floods and earthquakes for another century.

Once complete, the rehabilitated Lost Creek Dam is estimated to withstand potential floods and earthquakes for another century.


Granite Construction Incorporated announced July 27 it has been awarded a $20 million contract by the South Feather Water & Power Agency for the Lost Creek Dam Crest Modification Project in Strawberry Valley, CA. The contract will be included in Granite’s second quarter 2017 backlog.

Scope of work includes increasing the dam spillway openings, raising the crest outside of the spill section, reinforcing the downstream face, protecting the plunge pool area to prevent scouring of the foundation material, and replacing the dam crossing road. Due to the remote area of the dam, all concrete materials will be batched on-site. Once complete, the rehabilitated dam is estimated to withstand potential floods and earthquakes for another century.

Work began in spring 2017 and is scheduled to be complete by fall 2018.

For more information, visit www.graniteconstruction.com.


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Heavy Construction News – 2-D layered devices can self-assemble with precision — ScienceDaily – #Construction #News

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Squid-inspired proteins can act as programmable assemblers of 2D materials, like graphene oxide, to form hybrid materials with minute spacing between layers suitable for high-efficiency devices including flexible electronics, energy storage systems and mechanical actuators, according to an interdisciplinary team of Penn State researchers.

“2D layered materials can be made by vacuum (chemical vapor) deposition,” said Melik C. Demirel, Pierce Development Professor and professor of engineering science and mechanics . “But the process is expensive and takes a long time. With chemical vapor deposition the problem also is we can’t scale up.”

Materials like graphene oxide are composed of single layers of molecules connected in a plain. While the length and breadth of the sheet can be anything, the height is only that of one molecule. To make usable composites and devices, 2D materials must be stacked either in piles of identical sheets or combinations of sheets of different composition stacked to specification. Together with Mauricio Terrones, professor of physics, chemistry and materials science and engineering, and director of 2D Atomic Center, Penn State, Demirel and his team are currently looking at stacking sheets of identical materials using a solvent approach that self assembles.

“Using the solvent approach the molecules are self-assembling, self-healing and flexible,” said Demirel. “Currently we are stacking identical layers, but they don’t have to be the same.”

To make these molecular composites using solvent technology, the researchers combined the sheets of graphene oxide with synthetic polymers patterned after proteins found in squid ring teeth. One end of the protein strand attaches to the edge of a graphene oxide sheet and the other end attaches to the edge of another graphene dioxide sheet. The sheets of graphene oxide self-assemble to stack up with proteins linking the edges of the sheets. The length of these tandem repeat proteins — their molecular weight — determines the distance between sheets.

“Up until now, no one has been able to stack composite layers closer than 1 nanometer,” said Demirel. “We can stack them at atomistic precision with 0.4, 0.6 or 0.9 nanometer resolution by choosing the right molecular weight of the same protein. Respectively.”

The researchers tested this material’s ability to make tiny devices by creating bimorph thermal actuators. A bimorph activator is a small piece of material made from two different layers and placed perpendicular to a surface. When activated, usually by an electric current, the bimorph actuator bends from the perpendicular.

The researchers report in the July issue of Carbon that “these novel molecular composite bimorph actuators can facilitate thermal actuation at voltages as low as about 2 volts, and they boast energy efficiencies 18 times better than regular bimorph actuators assembled using bulk graphene oxide and tandem repeat films.” They believe that higher molecular weight proteins could reach much higher displacements.

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Materials provided by Penn State. Note: Content may be edited for style and length.


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Low Country JCB Celebrates Anniversary – Construction News

Low Country JCB Celebrates Anniversary :: Story ID: 34574 :: Construction Equipment Guide

 

📅   Thu June 01, 2017 – National Edition

 

(L-R): Jessica and Chris Shea, Low Country JCB owners, welcome Richard Fox-Marrs, JCB North America president and CEO, and Dusty Zeigler, original founding partner of Low Country Machinery and retired NFL lineman.

(L-R): Jessica and Chris Shea, Low Country JCB owners, welcome Richard Fox-Marrs, JCB North America president and CEO, and Dusty Zeigler, original founding partner of Low Country Machinery and retired NFL lineman.

Low Country JCB hosted a 15th anniversary celebration open house on May 12 at the company’s headquarters facility in Pooler, Ga. In addition to showing appreciation to the company’s valued customers, the event served as a celebration of the recent purchase of the distributorship by previous Low Country sales manager, Chris Shea.

A terrific crowd came out to celebrate the success of this distributorship and to see the newest JCB products, including the all-new JCB Hydradig, Teleskid, and Scissor Lifts. Guests also enjoyed the catered lunch and giveaways.

A number of representatives from JCB made their way from the JCB North American headquarters facility located virtually next door to Low Country JCB to show their support and to lend a hand in making this event a great success.—CEG

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