Rankey E.C.,University of Kansas |
Sedimentology | Year: 2012
As the product of a variety of sediment sources and sedimentation (and re-sedimentation) and erosion processes, the geomorphology and sedimentology of carbonate slopes are highly variable. The purpose of this study is to describe sub-bottom profiles and side-scan sonar, multibeam and optical data acquired by an autonomous underwater vehicle to explore variability in geomorphological and sedimentological character of the present-day platform-marginal, uppermost slope environments (<240m water depth) on the north, open-ocean facing flank of Little Bahama Bank, Bahamas. Although at time scales of greater than 100ka this margin is progradational, the data illustrate a complex juxtaposition of erosional and depositional processes and features. Erosion is evidenced by two prominent escarpments (70m and 120m) that expose eroded, bedded rocky outcrops. These escarpments are interpreted to represent relict features, related to past sea-level positions, although they still may be shedding debris. Aside from erosional remnants, sedimentation and active transport is indicated by several features, including active bedforms (especially above the 70m escarpment, but ripples occur to depths of ca 200m), several mass transport complexes that overlie and cover the lower escarpment, gravity flow deposits and rare slump features. Similarly, a thick (up to 20m) onlapping sediment wedge, interpreted to be Holocene in age, suggests lateral accretion of the slope by more than 75m in this period. Data illustrate that this open-ocean margin is distinct from windward margins in the Bahamas, which typically include near-vertical walls of erosion or bypass, flanked downdip by rubble and talus, and leeward margins, which have onlapping muddy wedges, but that lack marked terraces or escarpments. Collectively, the results provide perspectives into the nature and controls on complex geomorphological patterns of erosion and deposition in Holocene uppermost slope systems, concepts potentially applicable to ancient analogues. © 2012 The Authors. Journal compilation © 2012 International Association of Sedimentologists. Source
News Article | April 14, 2016
In any office you go to, you're likely to find a recycling bin filled with plastic water bottles. General Motors isn't any different. However, instead of placing its recycling in a heap outside of its Michigan facilities, the automaker is collecting those water bottles and giving them new life. As part of GM's "Do Your Part" project, all of the company's global facilities are recycling their water bottles to make a noise-reducing fabric insulation that blankets its Chevrolet Equinox crossover SUV. In addition, GM is turning those recycled bottles into air filtration parts used at their office locations and insulation in coats and sleeping bags for the homeless. "Recycling is good, but viewing waste as a valuable resource that can be plugged into your operations or products is even better," John Bradburn, GM's global manager of waste reduction, said in the company's press release statement earlier this week. "It's about rethinking the process and finding more sustainable ways to manufacture products and contribute to our communities." Andrew Mangan, the executive director of the U.S. Business Council for Sustainable Development, gives credit to companies like GM that are thinking about waste more progressively. "Many of today's businesses are challenging the take-make-dispose model and seeing the benefits of a more circular economy," Mangan said. "From closed-loop recycling to helping launch material reuse networks, GM is thinking differently and getting other companies to join in." The Equinox is far from the only GM vehicle that incorporates recycled content. The company says its Buick Verano's sound-dampening material in the vehicle's headliner is made from recycled cardboard from various GM plants. In addition, its Chevy Silverado and GMC Sierra trucks' radiator shrouds are made from a mix of plastic caps, shipping parts and other recycled materials from the company's Fort Wayne plant. GM even has test tires from its Milford Proving Ground shredded down and used to produce air and water baffles for several of its cars. Altogether, GM counts 131 landfill-free facilities worldwide, recycling the equivalent of 38 million garbage bags of byproducts annually, meaning the company will be saving plenty of money when it comes to these parts. © 2016 Tech Times, All rights reserved. Do not reproduce without permission.
News Article | April 13, 2016
Our feet are safe in the Ford F-150. That's right. Ford's F-150 is the safest pickup truck on the road today, based on the latest Insurance Institute for Highway Safety (IIHS) rating. Where other vehicles are likely to cause leg, ankle and foot injuries during specific kinds of front-end collisions, Ford's supercab is the only one on the street that doesn't. However, the Ford F-150 had had its share of problems in the past. Nonetheless, the F-150 model has improved from a "marginal" standing in 2015 to a "good" standing this year. Out of the seven vehicles tested by the IIHS, it was the only one to receive a "good" rating. "We commend Ford for taking last year's test results to heart and upgrading protection for the SuperCab occupants in small overlap crashes," says Raul Arbelaez, vice president of the IIHS Vehicle Research Center. "Ford is leading the way among large pickup manufacturers when it comes to protecting people in a range of crashes." Of the seven full-size pickup trucks tested by the IIHS, three others received' an "acceptable" rating: the Chevrolet Silverado 1500, the GMC Sierra 1500 and the Toyota Tundra. All of these vehicles feature double cab configurations, but in crew cab form, they actually tumbled to a lower to a "Marginal" rating. The worst performer in the group, however, was the Ram 1500 in Quad Cab and Crew Cab configurations. Even if it was the oldest vehicle to be tested, it still received poor marks for its structure and lower leg and foot injury protection. The Ram 1500 received the lowest rating of all with a "Poor" score. The toughest test created by the IIHS that has long troubled car makers is what is known as the small overlap crash test. This test simulates a car or truck heading straight into a narrow object like a pole on just one side of the front of the vehicle. Such collisions on the front corner of the car have challenged automakers to re-engineer the front of vehicles to better absorb both center and off-center impacts. That's exactly what Ford has done for the newer F-150. The automaker added wheelblockers, nylon hinge pillar reinforcements and rocker cab reinforcements that help in this particular crash scenario. As a result, it's the IIHS' Top Safety Pick. © 2016 Tech Times, All rights reserved. Do not reproduce without permission.
News Article | April 15, 2016
General Motors has a serious recall on its hands. USA Today reported Friday that the United States' largest automaker is recalling upwards of one million pickup trucks due to faulty seat belts. GM says the recall affects nearly 1.04 million 2014 and 2015 models of the Chevrolet Silverado and GMC Sierra 1500 pickup trucks in the U.S., Canada, Mexico, Latin America and extending as far as the Middle East. In the U.S. alone, the recall affects 895,232 vehicles. The problem with the seat belt is that, as drivers repeatedly sit down, the steel cable wears out over time and can snap. GM lists the recall as voluntary, adding that, after delving into warranty data, it hasn't come across any reported accidents, injuries or casualties caused by the defective seat belts. In a statement to the media, as reported by USA Today, GM also mentioned that the cost of the fix is "not expected to be significant" for the company, adding that it's free of charge to owners. According to the Associated Press, GM will fix the issue by installing a bracket on the cable tensioner or, if deemed necessary, replace the tensioner altogether. Although reports of the recall surfaced today, owners will be formally notified soon with dates that the company will address the recall fix, GM spokesperson Tom Wilkinson told the AP. Still, Friday's recall announcement didn't stop GM from unveiling its special 2016 Silverado Rally Edition during the Duck Commander 500 race at Texas Motor Speedway on Wednesday. Prior to that, last week, GM had announced that its 2014-16 Silverado models will be offering a new trailering camera system, enabling more confident towing for drivers. Two days prior to that, on April 6, GMC was honored as the "Most Refined Brand" by Kelley Blue Book, with the imprint seeing a retail jump of 13 percent last month for its best March in over a decade. That being said, GM would hate to have its momentum with the Sierra 1500 and Silverado slowed down by this recall, which shouldn't be hard to fix. Spreading the information about the recall, getting owners to bring their vehicles in and getting them fixed is key. © 2016 Tech Times, All rights reserved. Do not reproduce without permission.
News Article | September 11, 2016
Autonomous Cars - Five Things To Know About Self Driving Cars A software bug has prompted General Motors to issue a recall for 4.3 million vehicles that include trucks, cars and SUVs manufactured from 2014 to 2017. The faulty software may have the tendency to prevent airbags from deploying during a crash, and it can also affect seat belts, further aggravating the potential risk. The announcement on Sept. 9 came on the heels of a recent recall of 368,000 vehicles blamed on defective windshield wipers, Tech Times previously reported. In the latest recall, the software failure affects the sensing and diagnostic module, which prevents the airbags from deployment. This module refers to the computer component that can sense the movement of the vehicle and triggers the airbag to inflate in case of a crash. The problem was first reported in 2014 after an accident involving a 2014 Chevrolet Silverado. GM has since been conducting tests and diagnostics and reached the recall decision early this month. Information regarding their findings or how the failure actually transpires, however, were not made available. The problematic software has already led to a fatality and three injuries, Detroit News reported. The affected models include: Buick (LaCrosse, Encore); Chevrolet (SS, Corvette, Silverado 1500, Silverado HD, Spark EV, Tahoe, Trax, Caprice Suburban); GMC (Yukon, Yukon XL, Sierra HD); and, Cadillac (Escalade, Escalade ESV). To check whether a vehicle is part of the recall, consumers can head to safecar.gov where they can verify coverage using their Vehicle Identification number. GM states that owners of the cars covered will be contacted about recall details. They are also entitled to a free software upgrade, which can be undertaken in car dealers quickly. The number of recalled GM automobiles has not been seen since 2014 when 2.59 million cars were identified as defective due to faulty ignition, affecting their Takata airbags. This particular episode has been linked to 124 fatalities, which the company has compensated. GM has maintained that the fresh wave of recalled vehicles will not affect its financial results. However, the company has claimed in July that it stands to lose $550 million if government regulators will force it to recall 4.3 million automobiles to replace Takata airbag inflators, according to Fortune. The experience of Ford Motor could also provide insight into this issue after it recalled six of its car models due to faulty door latches. The move prompted the company to cut its 2016 profit before tax from $10.8 billion to $10.2 billion, according to a Bloomberg report. It is, however, important to note that GM's recall is voluntary and appears to be less serious than the 2014 problem with the Takata airbag. © 2016 Tech Times, All rights reserved. Do not reproduce without permission.