Advanced electromagnetic wave absorption nanomaterials can play an important role in addressing the issue of increasing electromagnetic pollution in the wireless communication field.Herein,a series of coralloid bimeta...Advanced electromagnetic wave absorption nanomaterials can play an important role in addressing the issue of increasing electromagnetic pollution in the wireless communication field.Herein,a series of coralloid bimetallic Fe_(0.54)Mo_(0.73)/Mo_(2)C@C(FMC)composites synthesized by a molybdenum blue preassembly strategy is presented as low-frequency electromagnetic wave absorbers with tunable frequency for the first time.Molybdenum blue,an ideal platform for molecular preassembly,retained abundant interfaces during the process of transformation in a confined space and promoted interfacial polarization,while bimetallic Fe_(0.54)Mo_(0.73) particles significantly improved the electromagnetic wave absorption properties of Mo_(2)C@C(MC).The minimum reflection loss(RL)continuously moved from a high-frequency region(Ku band)to a low-frequency region(S band)as the content of Fe_(0.54)Mo_(0.73) particles increased.The optimized FMC-5 exhibited an excellent electromagnetic wave absorption performance with a minimum RL value of−48.91 dB at 4.08 GHz.This work not only provides a deeper insight into designing high-performance electromagnetic wave absorbers with tunable frequency,but also offers a framework for the exploration of preparing polyoxometalate-functionalized derivative materials by a preassembly strategy.展开更多
This paper takes the integrated construction of cold water machine room in Wenquan Avenue Station of Chengdu Metro Line 17 as an example, and introduces in detail the application of BIM deepening design, model decompo...This paper takes the integrated construction of cold water machine room in Wenquan Avenue Station of Chengdu Metro Line 17 as an example, and introduces in detail the application of BIM deepening design, model decomposition, prefabrication, error elimination and other technologies in the integrated construction of refrigeration machine room. By combining BIM technology with digital prefabrication and secondary prefabrication between modules, a series of problems caused by construction site processing and installation are solved, and a new idea and method are provided for construction management of subway electromechanical installation engineering.展开更多
基金supported by the Natural Science Foundation of Hunan Province(Grant 2020JJ4684)the Fundamental Research Funds for the Central Universities of Central South University(Grant 2021zzts0522)the Recruitment Program of Global Youth Experts.
文摘Advanced electromagnetic wave absorption nanomaterials can play an important role in addressing the issue of increasing electromagnetic pollution in the wireless communication field.Herein,a series of coralloid bimetallic Fe_(0.54)Mo_(0.73)/Mo_(2)C@C(FMC)composites synthesized by a molybdenum blue preassembly strategy is presented as low-frequency electromagnetic wave absorbers with tunable frequency for the first time.Molybdenum blue,an ideal platform for molecular preassembly,retained abundant interfaces during the process of transformation in a confined space and promoted interfacial polarization,while bimetallic Fe_(0.54)Mo_(0.73) particles significantly improved the electromagnetic wave absorption properties of Mo_(2)C@C(MC).The minimum reflection loss(RL)continuously moved from a high-frequency region(Ku band)to a low-frequency region(S band)as the content of Fe_(0.54)Mo_(0.73) particles increased.The optimized FMC-5 exhibited an excellent electromagnetic wave absorption performance with a minimum RL value of−48.91 dB at 4.08 GHz.This work not only provides a deeper insight into designing high-performance electromagnetic wave absorbers with tunable frequency,but also offers a framework for the exploration of preparing polyoxometalate-functionalized derivative materials by a preassembly strategy.
文摘This paper takes the integrated construction of cold water machine room in Wenquan Avenue Station of Chengdu Metro Line 17 as an example, and introduces in detail the application of BIM deepening design, model decomposition, prefabrication, error elimination and other technologies in the integrated construction of refrigeration machine room. By combining BIM technology with digital prefabrication and secondary prefabrication between modules, a series of problems caused by construction site processing and installation are solved, and a new idea and method are provided for construction management of subway electromechanical installation engineering.
