As a primary type of clean energy,methane is also the second most important greenhouse gas after CO_(2)due to the high global warming potential.Large quantities of lean methane(0.1–1.0 vol%)are emitted into the atmos...As a primary type of clean energy,methane is also the second most important greenhouse gas after CO_(2)due to the high global warming potential.Large quantities of lean methane(0.1–1.0 vol%)are emitted into the atmosphere without any treatment during coal mine,oil,and natural gas production,thus leading to energy loss and greenhouse effect.In general,it is challenging to utilize lean methane due to its low concentration and flow instability,while catalytic combustion is a vital pathway to realize an efficient utilization of lean methane owing to the reduced emissions of polluting gases(e.g.,NOxand CO)during the reaction.In particular,to efficiently convert lean methane,it necessitates both the designs of highly active and stable heterogeneous catalysts that accelerate lean methane combustion at low temperatures and smart reactors that enable autothermal operation by optimizing heat management.In this review,we discuss the in-depth development,challenges,and prospects of catalytic lean methane combustion technology in various configurations,with particular emphasis on heat management from the point of view of material design combined with reactor configuration.The target is to describe a framework that can correlate the guiding principles among catalyst design,device innovation and system optimization,inspiring the development of groundbreaking combustion technology for the efficient utilization of lean methane.展开更多
We present and demonstrate a multifunctional single-fiber optical tweezer for particle trapping and transport.The fiber probe of fiber optical tweezers is constructed as a planar structure.Laser sources with wavelengt...We present and demonstrate a multifunctional single-fiber optical tweezer for particle trapping and transport.The fiber probe of fiber optical tweezers is constructed as a planar structure.Laser sources with wavelengths of 650 nm and 980 nm in a single-mode fiber excite the linearly polarized LP11mode and LP01mode beams,respectively.These two laser beams can achieve non-contact trapping and long-distance transport of particles after passing through a flat-facet fiber probe,respectively.This structure makes it possible to perform non-contact trapping and transport of particles by combining multiple wavelengths and multiple modes.展开更多
基金financially supported by the National Natural Science Foundation of China(21922606,21876139)the National Natural Science Foundation of Shaanxi Province(2020JQ-919)+2 种基金the Shaanxi Natural Science Fundamental Shaanxi Coal Chemical Joint Fund(2019JLM-14)the Initial Scientific Research Fund for Special Zone’s Talents(XJ18T06)K.C.Wong Education Foundation。
文摘As a primary type of clean energy,methane is also the second most important greenhouse gas after CO_(2)due to the high global warming potential.Large quantities of lean methane(0.1–1.0 vol%)are emitted into the atmosphere without any treatment during coal mine,oil,and natural gas production,thus leading to energy loss and greenhouse effect.In general,it is challenging to utilize lean methane due to its low concentration and flow instability,while catalytic combustion is a vital pathway to realize an efficient utilization of lean methane owing to the reduced emissions of polluting gases(e.g.,NOxand CO)during the reaction.In particular,to efficiently convert lean methane,it necessitates both the designs of highly active and stable heterogeneous catalysts that accelerate lean methane combustion at low temperatures and smart reactors that enable autothermal operation by optimizing heat management.In this review,we discuss the in-depth development,challenges,and prospects of catalytic lean methane combustion technology in various configurations,with particular emphasis on heat management from the point of view of material design combined with reactor configuration.The target is to describe a framework that can correlate the guiding principles among catalyst design,device innovation and system optimization,inspiring the development of groundbreaking combustion technology for the efficient utilization of lean methane.
基金supported by the Joint Guidance Project of Natural Science Foundation of Heilongjiang Province,China(No.LH2021F008)。
文摘We present and demonstrate a multifunctional single-fiber optical tweezer for particle trapping and transport.The fiber probe of fiber optical tweezers is constructed as a planar structure.Laser sources with wavelengths of 650 nm and 980 nm in a single-mode fiber excite the linearly polarized LP11mode and LP01mode beams,respectively.These two laser beams can achieve non-contact trapping and long-distance transport of particles after passing through a flat-facet fiber probe,respectively.This structure makes it possible to perform non-contact trapping and transport of particles by combining multiple wavelengths and multiple modes.
