MarketWatch | Boeing to break ground on plane-finishing facility in coastal Chinese ... MarketWatch The country is also developing its own large airliner, the Comac C919, which it hopes can someday compete with the Boeing 737 and Airbus 320 for a slice of the lucrative global commercial aviation market. See this report at Caixin Online. Follow Caixin ... y más » |
Leeham Co.: A new partnership, still in the Memorandum of Cooperation stage, between France and Japan aims to expand a relationship that could lead to joint development of advanced aircraft for Airbus.
The MOC was signed betweenDJI Introduces M200 series UAV built for surveying Spatial Source Unmanned aerial technology giants, DJI, have released unveiled the new Matrice 200 drone series (M200) professional level drone suitable for aerial surveys. The unmanned aerial vehicle (UAV) is purpose-built for aerial inspections and data collection ... |
i-HLS - Israel Homeland Security | New Stealth Advanced UAV Under Development in China i-HLS - Israel Homeland Security China has begun to develop military advanced UAVs that can evade radar and anti-aircraft weapons. The China Aerospace Science and Industry Corp (CASIC), the country's largest missile-manufacturer, has been focusing on the development of a ... |
PR
In February specialists of the Central AeroHydrodynamic Institute named after professor N.E. Zhukovsky (TsAGI, part of the National Research Center “Institute named after N.E. Zhukovsky”) started to research the strength of a modified door of the main landing gear of the airliner SSJ100.
The main goal of the work is to improve the Sukhoi Superjet 100 fleet. Today the aircraft is fitted with a two-part door of standard design. To enhance aerodynamic characteristics of the SSJ100, the designer, Sukhoi Civil Aircraft Company, has modified the landing gear door design: a new modification consists of a single part, which is manufactured with the use of composite materials.
Initially, TsAGI will carry out experiments to verify the service life of the door. Then, it will be exposed to maximum operating loads, which may develop during a real flight, thus researching the residual strength. Institute specialists plan to run about 80,000 flight cycles in total.
“Improving an existing aircraft is a normal practice all over the world,” Victor Tsygankov, the Head of TsAGI’s Static and Thermal Strength Department, explained. “With minor changes, designers try to make an aircraft more cost effective, comfortable and safe. Thus, a modified door of the main landing gear will allow increasing the lift/drag ratio of the SSJ100 and reducing its takeoff run. To
PR
In mid-February the Central AeroHydrodynamic Institute named after professor N.E. Zhukovsky (TsAGI, part of the National Research Center “Institute named after N.E. Zhukovsky”) took part in the 2nd All-Russian Scientific and Technical Conference “Functional materials for aircraft noise reduction onboard and on site.”
TsAGI’s scientists prepared the paper entitled “Issues related to creation of efficient sound-absorbing structures for advanced high-bypass turbojet engines,” which, according to the organizers’ opinion, was declared to be the best one among those presented at the Conference. The authors analyzed the issues to be dealt with during design of structures meant for noise reduction of the aircraft engine fan. The scientists came to the conclusion that stricter ICAO’s regulations for on-site noise have brought the research process of creating sound-absorbing structures for new-generation turbojet engines to a new round of development. Therefore, all the algorithms of the process flow need modifying by more accurate consideration of the factors determining the efficiency of sound-absorbing structures.
In addition, TsAGI’s specialists referred to the issue of onboard noise in an advanced long-range aircraft. Also, they explained the acoustic research of multilayer sound-absorbing structures with corrugated fillers of air spaces and thin dense fine meshes, flat composite panels, and vibration-absorbing coatings with a reinforcing layer.
The 2nd All-Russian Scientific and Technical Conference “Functional materials for aircraft noise reduction onboard and on site” was held in VIAM along with the Process Platform “New polymer composite materials and technologies.” The Conference was attended by specialists researching the issues of aircraft noise reduction onboard and on site.
Over recent years the explosion in popularity of drones, both professionally and for amateur use, has inspired researchers to consider how to make flying robots as safe and robust as possible. Previous design methods have included producing bulky protective cages or making them as unlikely to crash as possible. Recently, researchers from Floreano Lab, NCCR Robotics and EPFL have presented a new approach to making crash resilient quadcopters – making them soft, so it doesn’t matter if they come into contact with their surrounding environment... Continue reading https://actu.epfl.ch/news/insect-inspired-mechanical-resilience-for-multic-2/
press release:
The new molecule harvests sunlight to create useable material from carbon dioxide in the atmosphere
March 8, 2017
FOR IMMEDIATE RELEASE
BLOOMINGTON, Ind. -- An international team of scientists led by Liang-shi Li at Indiana University has achieved a new milestone in the quest to recycle carbon dioxide in the Earth’s atmosphere into carbon-neutral fuels and others materials.
The chemists have engineered a molecule that uses light or electricity to convert the greenhouse gas carbon dioxide into carbon monoxide -- a carbon-neutral fuel source -- more efficiently than any other method of "carbon reduction."
The process is reported today in the Journal of the American Chemical Society.
"If you can create an efficient enough molecule for this reaction, it will produce energy that is free and storable in the form of fuels," said Li, associate professor in the IU Bloomington College of Arts and Sciences' Department of Chemistry. "This study is a major leap in that direction."
Burning fuel -- such as carbon monoxide -- produces carbon dioxide and releases energy. Turning carbon dioxide back into fuel requires at least the same amount of energy. A major goal among scientists has been decreasing the excess energy needed.
This is exactly what Li’s molecule achieves: requiring the least amount of energy reported thus far to drive the formation of carbon monoxide. The molecule -- a nanographene-rhenium complex connected via an organic compound known as bipyridine -- triggers a highly efficient reaction that converts carbon dioxide to carbon monoxide.
The ability to efficiently and exclusively create carbon monoxide is significant due to the molecule's versatility.
"Carbon monoxide is an important raw material in a lot of industrial processes," Li said. "It's also a way to store energy as a carbon-neutral fuel since you’re not putting any more carbon back into the atmosphere than you already removed. You're simply re-releasing the solar power you used to make it."
The secret to the molecule’s efficiency is nanographene -- a nanometer-scale piece of graphite, a common form of carbon (i.e. the black "lead" in pencils) -- because the material’s dark color absorbs a large amount of sunlight.
Li said that bipyridine-metal complexes have long been studied to reduce carbon dioxide to carbon monoxide with sunlight. But these molecules can use only a tiny sliver of the light in sunlight, primarily in the ultraviolet range, which is invisible to the naked eye. In contrast, the molecule developed at IU takes advantage of the light-absorbing power of nanographene to create a reaction that uses sunlight in the wavelength up to 600 nanometers -- a large portion of the visible light spectrum.
Essentially, Li said, the molecule acts as a two-part system: a nanographene "energy collector" that absorbs energy from sunlight and an atomic rhenium "engine" that produces carbon monoxide. The energy collector drives a flow of electrons to the rhenium atom, which repeatedly binds and converts the normally stable carbon dioxide to carbon monoxide.
The idea to link nanographene to the metal arose from Li's earlier efforts to create a more efficient solar cell with the carbon-based material. "We asked ourselves: Could we cut out the middle man -- solar cells -- and use the light-absorbing quality of nanographene alone to drive the reaction?" he said.
Next, Li plans to make the molecule more powerful, including making it last longer and survive in a non-liquid form, since solid catalysts are easier to use in the real world. He is also working to replace the rhenium atom in the molecule -- a rare element -- with manganese, a more common and less expensive metal.
All of the research on the study was conducted at IU. The first authors on the paper are Xiaoxiao Qiao and Qiqi Li, former graduate students at IU. Additional authors are professor Krishnan Raghavachari and graduate students Richard N. Schaugaard, Benjamin W. Noffke and Yijun Liu, all of the Department of Chemistry; Dongping Li, a visiting professor from Nanchang University; and Lu Liu, a visiting undergraduate from the University of Science and Technology of China.
This study was supported by IU Office of the Vice Provost for Research and the National Science Foundation.
, Qiqi Li†, Richard N. Schaugaard, Benjamin W. Noffke, Yijun Liu , Dongping Li, Lu Liu, Krishnan Raghavachari , and Liang-shi Li* Improving energy efficiency of electrocatalytic and photocatalytic CO2 conversion to useful chemicals poses a significant scientific challenge. We report on using a colloidal nanographene to form a molecular complex with a metal ion to tackle this challenge. In this work, a well-defined nanographene–Re complex was synthesized, in which electron delocalization over the nanographene and the metal ion significantly decreases the electrical potential needed to drive the chemical reduction. We show the complex can selectively electrocatalyze CO2 reduction to CO in tetrahydrofuran at −0.48 V vs NHE, the least negative potential reported for a molecular catalyst. In addition, the complex can absorb a significant spectrum of visible light to photocatalyze the chemical transformation without the need for a photosensitizer.View: ACS ActiveView PDF | PDF | PDF w/ Links | Full Text HTML
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