This paper presents a deep learning algorithm for tomographic reconstruction (GANrec). The algorithm uses a generative adversarial network (GAN) to solve the inverse of the Radon transform directly. It works for independent sinograms without additional training steps. The GAN has been developed to fit the input sinogram with the model sinogram generated from the predicted reconstruction. Good quality reconstructions can be obtained during the minimization of the fitting errors. The reconstruction is a self-training procedure based on the physics model, instead of on training data. The algorithm showed significant improvements in the reconstruction accuracy, especially for missing-wedge tomography acquired at less than 180° rotational range. It was also validated by reconstructing a missing-wedge X-ray ptychographic tomography (PXCT) data set of a macroporous zeolite particle, for which only 51 projections over 70° could be collected. The GANrec recovered the 3D pore structure with reasonable quality for further analysis. This reconstruction concept can work universally for most of the ill-posed inverse problems if the forward model is well defined, such as phase retrieval of in-line phase-contrast imaging.

Here, an analysis is performed of how uncorrected antisymmetric aberrations, such as coma and trefoil, affect cryo-EM single-particle reconstruction (SPR) results, and an analytical formula quantifying information loss owing to their presence is inferred that explains why Fourier-shell coefficient-based statistics may report significantly overestimated resolution if these aberrations are not fully corrected. The analysis is validated with reference-based aberration refinement for two cryo-EM SPR data sets acquired with a 200 kV microscope in the presence of coma exceeding 40 µm, and 2.3 and 2.7 Å reconstructions for 144 and 173 kDa particles, respectively, were obtained. The results provide a description of an efficient approach for assessing information loss in cryo-EM SPR data acquired in the presence of higher order aberrations, and address inconsistent guidelines regarding the level of aberrations that is acceptable in cryo-EM SPR experiments.

A method for reconstructing the three-dimensional grain structure from data collected with a recently introduced laboratory-based X-ray diffraction contrast tomography system is presented. Diffraction contrast patterns are recorded in Laue-focusing geometry. The diffraction geometry exposes shape information within recorded diffraction spots. In order to yield the three-dimensional crystallographic microstructure, diffraction spots are extracted and fed into a reconstruction scheme. The scheme successively traverses and refines solution space until a reasonable reconstruction is reached. This unique reconstruction approach produces results efficiently and fast for well suited samples.

Crystallographic textures, as they develop for example during cold forming, can have a significant influence on the mechanical properties of metals, such as plastic anisotropy. Textures are typically characterized by a non-uniform distribution of crystallographic orientations that can be measured by diffraction experiments like electron backscatter diffraction (EBSD). Such experimental data usually contain a large number of data points, which must be significantly reduced to be used for numerical modeling. However, the challenge in such data reduction is to preserve the important characteristics of the experimental data, while reducing the volume and preserving the computational efficiency of the numerical model. For example, in micromechanical modeling, representative volume elements (RVEs) of the real microstructure are generated and the mechanical properties of these RVEs are studied by the crystal plasticity finite element method. In this work, a new method is developed for extracting a reduced set of orientations from EBSD data containing a large number of orientations. This approach is based on the established integer approximation method and it minimizes its shortcomings. Furthermore, the L1 norm is applied as an error function; this is commonly used in texture analysis for quantitative assessment of the degree of approximation and can be used to control the convergence behavior. The method is tested on four experimental data sets to demonstrate its capabilities. This new method for the purposeful reduction of a set of orientations into equally weighted orientations is not only suitable for numerical simulation but also shows improvement in results in comparison with other available methods.

Clip from silent edited film "Bryson Jones Travelogue: Lure of the West" (ca. 1927) shows Mount Rushmore National Memorial under construction, including blasting off cliff face, scaffolding, men working, and the completed monument.

The post Construction of Mount Rushmore National Memorial from the Smithsonian’s Human Studies Film Archives appeared first on Smithsonian Insider.

A small Ontario company is putting together one of the most complete T. rex ever found. It will be on display at the Smithsonian.

The post T-rex reconstruction appeared first on Smithsonian Insider.

There is sufficient evidence from tree rings, boreholes, retreating glaciers, and other proxies of past surface temperatures to say with a high level of confidence that the last few decades of the 20th century were warmer than any comparable period in the last 400 years, according to a new report from the National Research Council.

The U.S. lacks icebreaking capability in the Arctic and Antarctic and should build four polar icebreakers with heavy icebreaking capability to help minimize the life-cycle costs of icebreaker acquisition and operations, says a new congressionally mandated letter report from the National Academies of Sciences, Engineering, and Medicine.

A job seeker fills out an application during a career fair at the Southeast Community Facility Commission on May 21, 2014 in San Francisco; Credit: Justin Sullivan/Getty Images

California employers added 44,200 jobs in August, the largest gain of any state in the country. The state's unemployment rate stood still at 7.4 percent, compared to 6.1 percent nationwide.

"When the national numbers came out for August, and we saw a significant slowdown in job creation, we were a little bit concerned that we'd see the same thing happening here," said economist Kimberly Ritter-Martinez of the Los Angeles County Economic Development Corporation. "But in California, we stayed pretty much on track, outpacing the nation in terms of job creation." 

The construction sector was a huge contributor to California's job growth in August, with a gain of 13,600 jobs.  The other sectors with large gains were Education/Health Services (+12,200), and Professional/Business Services (+10,600). 

"We've been seeing steady increases in construction employment for some time, but it has been a slow steady increase," said Tom Holsman, CEO of the Associated General Contractors of California.

"Recent increases are attributable to many projects that have been in the early stages of startup gaining momentum," Holsman added, citing LA County Metro transit projects and the new Wilshire Grand Hotel construction project as local examples.

In Los Angeles County, the unemployment rate also stayed flat at 8.1 percent, but it remains far lower than the 9.9 percent of August of 2013. In the last twelve months, the L.A. County Metro area has gained 6,600 construction jobs, a rate of 5.6 percent.

Ritter-Martinez, of the LAEDC says other economic indicators support a boost in construction jobs at the Los Angeles and statewide levels: permits for new housing construction, remodeling, and non-residential construction are all on the rise. 

"Builders and developers are reporting that they're having trouble finding some skilled labor for construction," Ritter-Martinez said. "It's taken so long for that sector to come back, a lot of construction people have gone off and found other kinds of jobs or moved out of the region." 

In Orange County, the unemployment rate was 5.4 percent, down from 5.7 percent in July. The unemployment rate in the Riverside-San Bernardino-Ontario area was 8.7 percent in 
August 2014, down from a revised 9.3 percent in July 2014.

The last two decades have seen a series of new construction waste policies management in Hong Kong. One of the most significant is an offsite construction waste sorting (CWS) programme which, since its implementation in 2006, has separated 5.11 million tonnes of construction waste into different materials. The researchers suggest that the study provides an important reference for other countries working to minimise construction waste.

In a new study, Spanish researchers describe a method specifically designed for measuring and characterising noise from building sites. They claim the method could help shape future policy related to noise pollution caused by the construction industry and provide important information to help reduce construction noise.

The greenhouse gas emissions from the construction of new houses are so high that they exceed the emissions from three decades of use, a Finnish study has found. The research is based on houses complying with recently introduced, energy efficient building regulations. According to the authors, as buildings become more efficient this ‘carbon spike’ associated with construction is more important than has been suggested by previous studies.

Researchers have used a new comprehensive life cycle approach to estimate greenhouse gas (GHG) emissions from road construction. When applied to four projects in Spain, the results suggest improvements could be made in the use and efficiency of off-road machinery, the choice of materials and restoration of ecosystems.

Noise caused by construction of Germany’s first offshore wind farm caused significant habitat disturbance for harbour porpoises, according to a recent study. Its results suggest that porpoises avoided areas up to 20 kilometres from the noise source during construction of the wind farm’s foundations.

A recent study investigated the environmental impact of the disposal of construction waste in Catalonia, Spain. The study suggests that the best options are to recycle construction waste where possible, incinerate the rest and landfill when there is no other option. These findings are in line with the waste hierarchy specified in the Waste Framework Directive.

The environmental benefits of recycling construction and demolition waste (CDW) are considerable, even after accounting for the impacts of the recycling process itself, research confirms. By assessing CO2 and energy use at a large-scale recycling plant in Portugal reseachers have shown that, over its 60-year lifespan, the CO2 emissions prevented will be ten times as much as those produced, and eight times as much energy will be saved, than is used.

Management of waste from construction and demolition sites is a major concern, particularly in urban areas where large volumes of materials are generated. A recent study on the construction and demolition waste (CDW) produced in Lisbon, Portugal, suggests that improved municipal collection systems are needed to reduce the amount of waste ending up in landfill or illegal disposal sites.

Recycled waste material could play a major role in the construction of roads in Europe, bringing both environmental and economic benefits. A new study proposes a scenario where 50% of the asphalt for Europe’s roads consists of recycled materials, leading to significant reductions in costs, energy use and greenhouse gas emissions.

Wind farms are an important component of Europe’s shift towards a greener energy supply, but they could potentially have an impact on marine ecosystems. This study provides the first measurements of the distribution of harbour seals in relation to the construction and operation of wind farms, and makes recommendations to minimise any potential harm, including breaks in the pile-driving phase of construction.

The EU Waste Framework Directive aims to recycle or recover materially 70% of non-hazardous construction and demolition waste by 2020. This study evaluated the performance of the Finnish waste management system against this target. The results showed that the system generates environmental benefits and is profitable, but has not reached the 70% target. The researchers suggest ways the target could be met and recommend region-specific recycling objectives in the EU.

Better and more efficient management of materials is an important EU policy goal. New research has analysed what drives resource use and the productive use of materials across Europe and indicated that energy efficiency and construction of buildings and roads are the main policy areas to address.

Although most energy in homes is used for heating and hot water, significant amounts of energy are also used when a house is built. A lifecycle assessment of a low-energy, affordable timber house indicates that large energy and carbon savings can be made when alternatives to traditional methods of construction are used.

The construction industry is among the top three drivers of resource use in the EU. This study investigated the environmental impacts of a common construction method, drill and blast tunnelling, using life cycle assessment. The researchers assessed 20 years of data on tunnelling in Norway to identify areas that could be targeted to reduce its environmental impact. They recommend reduced consumption of explosives and increased use of renewable energy.

Weathering of treated wood and other construction materials can lead to the release of chemicals into the environment. Researchers have investigated the release of biocides from wood and roof paints, demonstrating that the amount of water in contact with exposed surfaces is a key factor in determining the level of active chemicals released. The study provides guidance for testing biocidal products in line with the European Biocidal Products Regulation.

Construction is scheduled to begin Sunday, August 12, weather permitting, on the third of three segments to widen approximately 21 miles total on Interstate 64 in Newport News, James City County and York County.

Above: Powhatan in the water at VT Halter Marine following a successful launch on August 11, 2018 PASCAGOULA, MISSISSIPPI – The Virginia...

CULPEPER —  A new traffic pattern will take effect next week as construction begins on the westbound Route 211/522 (Lee Highway) bridge over the...

LEESBURG – The two-lane Cochran Mill Road (Route 653) bridge over Tuscarora Creek has been reduced to one lane of alternating traffic until further...

NEWINGTON – Backlick Road at the Fairfax County Parkway (Route 286) intersection between Cinder Bed Road and Terminal Road will be closed nightly...

Part of the Keystone oil pipeline was shut down after a 5,000-barrel leak in South Dakota, the pipeline's operator TransCanada said.

Environmentally-friendly practices aren't just for new buildings anymore. Their existing – and, in some cases, elderly – counterparts are catching on, too.

The federally protected and UNESCO-recognized wilderness area is front and center as work on the border wall between the U.S. and Mexico continues.

Swarms of jellyfish are clogging water intakes at power plants around the world, and a new study explains why jellyfish populations are on the rise.

The ARK at JFK will boast luxurious accommodations for all species — but not people.

Are there any solutions to the loss of capacity and increasing premiums in construction PI? Martin Friel investigates

Sector has recently been troubled by hardening capacity and cover shortages.

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A new 127,798 square-foot assisted living and memory care community in Stuart, Florida

The new $11.7 million senior living community will be a first of its kind within Maumee city limits

Team Sports selected as product provider for Safe Zone Concept, utilizing shipping containers to create, multi-use Safe Rooms that utilize materials/systems that comply with FEMA 361 Standards.

The project's completion marks the sixth collaboration between The WellBridge Group and The Douglas Company

Construction of SPL's new Midland, Texas lab and field office to be completed by fourth quarter of 2018.

Company Increases Commitment to Tarp Covering Product serving North American EPC Contractors

FMI Corporation is pleased to announce the release of its second quarter 2019 North American Construction Outlook. The publication offers construction forecasts for a broad range of market segments and geographies in the U.S. and Canada.

Walnut Community Taxpayers Group Win Court Victory!

Westlake presents an opportunity to live in a peaceful gated community and enjoy the lakeside lifestyle of Lake Elsinore. Three floorplans will be offered, featuring three to five bedrooms and approximately 1,794 to 2,288.