Able to precisely control and manipulate materials'states at micro/nano-scale level,femtosecond(fs)laser micro/nano processing technology has undergone tremendous development over the past three decades.Free-formi...Able to precisely control and manipulate materials'states at micro/nano-scale level,femtosecond(fs)laser micro/nano processing technology has undergone tremendous development over the past three decades.Free-forming three-dimensional(3D)microscale functional devices and inducing fascinating and unique physical or chemical phenomena have granted this technology powerful versatility that no other technology can match.As this technology advances rapidly in various fields of application,some key challenges have emerged and remain to be urgently addressed.This review firstly introduces the fundamental principles for understanding how fs laser pulses interact with materials and the associated unique phenomena in section 2.Then micro/nano-fabrication in transparent materials by fs laser processing is presented in section 3.Thereafter,several high efficiency/throughput fabrication methods as well as pulse-shaping techniques are listed in sections 4 and 5 reviews four-dimensional(4D)and nanoscale printing realized by fs laser processing technology.Special attention is paid to the heterogeneous integration(HI)of functional materials enabled by fs laser processing in section 6.Several intriguing examples of 3D functional micro-devices created by fs laser-based manufacturing methods such as microfluidics,lab-on-chip,micro-optics,micro-mechanics,micro-electronics,micro-bots and micro-biodevices are reviewed in section 7.Finally,a summary of the review and a perspective are proposed to explore the challenges and future opportunities for further betterment of fs laser micro/nano processing technology.展开更多
Micro Food processing industry is gaining its momentum in the recent years in Northeast India and particularly in Manipur.This sector plays an important role in connecting the bridge between the agricultural productio...Micro Food processing industry is gaining its momentum in the recent years in Northeast India and particularly in Manipur.This sector plays an important role in connecting the bridge between the agricultural production and the entrepreneurship development.The region bestows by the abundance of unique and rich agro and horticultural produce gives schemes and projects also add to the development of this sector and to the food entrepreneur by providing financial,technical,infrastructural and business support.The state sharing its border with the Myanmar has a significant impact on the food processing industry particularly in terms of marketing and trading aspects.Food Entrepreneurs should enhance their work on diversifying the horizons of the value added products,increasing job opportunities,marketing,training and technical skills etc.which will ultimately help in developing the Micro food processing sector in the state.展开更多
This paper proposes a down-stroke abrasive belt grinding under micro feeding for noise reduction surface.Firstly,a physical model of processing under micro feeding for noise reduction structure was established.Based o...This paper proposes a down-stroke abrasive belt grinding under micro feeding for noise reduction surface.Firstly,a physical model of processing under micro feeding for noise reduction structure was established.Based on the flexible contact characteristics of abrasive belt grinding and Hertz contact theory,a mathematical model suitable for this method was established,considering vibration and abrasive belt wear.Secondly,a simulation analysis was carried out.Then,an experimental platform was built to analyze the influence of process parameters on surface roughness and surface microstructure,with the model verified.Finally,the propeller with pit structure was simulated,and the noise reduction performance of the propeller under this method and general abrasive belt grinding was compared and analyzed.The results show that the maximum error of the model based on proposed method does not exceed 10%,and the coincidence degree of the minimum error point can reach 90%at lower feed speed and higher linear velocity of the abrasive belt.The noise reduction effect of the propeller with pit-shaped surfaces can reach 35%.Through the above analysis,the proposed method can be used for the processing of noise reduction surfaces.展开更多
It would be well to note that in the absence of clear data about the formation of adaptation systems,or mechanisms of their occurrence,all that is recognized is the realization of the micro evolutionary processes.Ther...It would be well to note that in the absence of clear data about the formation of adaptation systems,or mechanisms of their occurrence,all that is recognized is the realization of the micro evolutionary processes.There is no well-defined connection between information exchange and formation展开更多
This paper covers a micro sensor analog signal processing circuit system（MASPS） chip with low power and a digital signal processing circuit board implementation including hardware connection and software design. Att...This paper covers a micro sensor analog signal processing circuit system（MASPS） chip with low power and a digital signal processing circuit board implementation including hardware connection and software design. Attention has been paid to incorporate the MASPS chip into the digital circuit board.The ultimate aim is to form a hybrid circuit used for mixed-signal processing,which can be applied to a micro sensor flow monitoring system.展开更多
There are shown the wide possibilities of combined micro plasma welding methods. They permit, for example, to do the local surfacing without essential deformations of rather thin jewelry elements, including a big grow...There are shown the wide possibilities of combined micro plasma welding methods. They permit, for example, to do the local surfacing without essential deformations of rather thin jewelry elements, including a big growth a rise or layer of metal which exceeds it thickness in 2~8 times at the space with the approximately the same sizes. Such opportunities are based on the various possibilities of the joint producing-with different participation of metal parts and filler material. It may be added as a standard paste, wire, strip, etc. An operator can easy choose-where it is reasonable to apply only welding or brazing process as well as their combinations-due to his qualification, the concrete jewelry good design, needed accuracy of the given joint adjustment and, of course, the operators fantasy. At the same time he has excellentchances to repair the spoiled jewelry good or its element. All these processes are very easy for realization and theymay be even made by beginners and not only in jewelry, but also forrepairing of copper tubes, brass heat exchangers, various bronze goods, in dental purposes.展开更多
The authors present a polymethyl methacrylate(PMMA)-based,reusable microsphere mask used in the laser sub-wavelength photolithography.In order to overcome the diffraction limit to achieve nano-structuring using l-|im ...The authors present a polymethyl methacrylate(PMMA)-based,reusable microsphere mask used in the laser sub-wavelength photolithography.In order to overcome the diffraction limit to achieve nano-structuring using l-|im laser wavelength,the photolithography technique was conventionally characterized by applying a one-off monolayer of silica microspheres serving as Mie scatterers.Addressing the major limitation of this technique,which was that the monolayer of microspheres must be prepared on the sample surface prior to fabrication,the proposed hot press approach could firmly fuse the 1silica microspheres to the PMMA base without the use of adhesives.The PMMA-based microsphere mask could hence reduce the amount of work for the monolayer preparation and was proven reusable for at least 20 times without damage to top or bottom surfaces.Using the mask,dimples that were 0.7 pm in diameter and 40 nm in depth were produced on tool steel by a single pulse of picosecond laser irradiation.展开更多
基金supported by National Key R&D Program of China(Grant Nos.2021YFB2802000 and 2022YFB2804300)Science and Technology Commission of Shanghai Municipality(Grant No.21DZ1100500)+3 种基金Shanghai Municipal Science and Technology Major Projectthe Shanghai Frontiers Science Center Program(2021-2025 No.20)National Natural Science Foundation of China(Grant No.61975123)Shanghai Scienceand Technology Innovation Action Plan(Grant No.23JC1403100)。
文摘Able to precisely control and manipulate materials'states at micro/nano-scale level,femtosecond(fs)laser micro/nano processing technology has undergone tremendous development over the past three decades.Free-forming three-dimensional(3D)microscale functional devices and inducing fascinating and unique physical or chemical phenomena have granted this technology powerful versatility that no other technology can match.As this technology advances rapidly in various fields of application,some key challenges have emerged and remain to be urgently addressed.This review firstly introduces the fundamental principles for understanding how fs laser pulses interact with materials and the associated unique phenomena in section 2.Then micro/nano-fabrication in transparent materials by fs laser processing is presented in section 3.Thereafter,several high efficiency/throughput fabrication methods as well as pulse-shaping techniques are listed in sections 4 and 5 reviews four-dimensional(4D)and nanoscale printing realized by fs laser processing technology.Special attention is paid to the heterogeneous integration(HI)of functional materials enabled by fs laser processing in section 6.Several intriguing examples of 3D functional micro-devices created by fs laser-based manufacturing methods such as microfluidics,lab-on-chip,micro-optics,micro-mechanics,micro-electronics,micro-bots and micro-biodevices are reviewed in section 7.Finally,a summary of the review and a perspective are proposed to explore the challenges and future opportunities for further betterment of fs laser micro/nano processing technology.
文摘Micro Food processing industry is gaining its momentum in the recent years in Northeast India and particularly in Manipur.This sector plays an important role in connecting the bridge between the agricultural production and the entrepreneurship development.The region bestows by the abundance of unique and rich agro and horticultural produce gives schemes and projects also add to the development of this sector and to the food entrepreneur by providing financial,technical,infrastructural and business support.The state sharing its border with the Myanmar has a significant impact on the food processing industry particularly in terms of marketing and trading aspects.Food Entrepreneurs should enhance their work on diversifying the horizons of the value added products,increasing job opportunities,marketing,training and technical skills etc.which will ultimately help in developing the Micro food processing sector in the state.
基金This work was supported by National Natural Science Foundation of China(U1908232)National Science and Technology Major Project(2017-VII-0002-0095)+2 种基金Graduate scientific research and innovation foundation of Chongqing(CYB20009)China Postdoctoral Science Foundation(2020M673126)Natural Science Foundation of Chongqing(cstc2020jcyj-bshX0128).
文摘This paper proposes a down-stroke abrasive belt grinding under micro feeding for noise reduction surface.Firstly,a physical model of processing under micro feeding for noise reduction structure was established.Based on the flexible contact characteristics of abrasive belt grinding and Hertz contact theory,a mathematical model suitable for this method was established,considering vibration and abrasive belt wear.Secondly,a simulation analysis was carried out.Then,an experimental platform was built to analyze the influence of process parameters on surface roughness and surface microstructure,with the model verified.Finally,the propeller with pit structure was simulated,and the noise reduction performance of the propeller under this method and general abrasive belt grinding was compared and analyzed.The results show that the maximum error of the model based on proposed method does not exceed 10%,and the coincidence degree of the minimum error point can reach 90%at lower feed speed and higher linear velocity of the abrasive belt.The noise reduction effect of the propeller with pit-shaped surfaces can reach 35%.Through the above analysis,the proposed method can be used for the processing of noise reduction surfaces.
文摘It would be well to note that in the absence of clear data about the formation of adaptation systems,or mechanisms of their occurrence,all that is recognized is the realization of the micro evolutionary processes.There is no well-defined connection between information exchange and formation
基金Project supported by National Natural Science Foundation of China(No60843005)the Basic Research Foundation of Beijing Institute of Technology,China(No20070142018)
文摘This paper covers a micro sensor analog signal processing circuit system（MASPS） chip with low power and a digital signal processing circuit board implementation including hardware connection and software design. Attention has been paid to incorporate the MASPS chip into the digital circuit board.The ultimate aim is to form a hybrid circuit used for mixed-signal processing,which can be applied to a micro sensor flow monitoring system.
文摘There are shown the wide possibilities of combined micro plasma welding methods. They permit, for example, to do the local surfacing without essential deformations of rather thin jewelry elements, including a big growth a rise or layer of metal which exceeds it thickness in 2~8 times at the space with the approximately the same sizes. Such opportunities are based on the various possibilities of the joint producing-with different participation of metal parts and filler material. It may be added as a standard paste, wire, strip, etc. An operator can easy choose-where it is reasonable to apply only welding or brazing process as well as their combinations-due to his qualification, the concrete jewelry good design, needed accuracy of the given joint adjustment and, of course, the operators fantasy. At the same time he has excellentchances to repair the spoiled jewelry good or its element. All these processes are very easy for realization and theymay be even made by beginners and not only in jewelry, but also forrepairing of copper tubes, brass heat exchangers, various bronze goods, in dental purposes.
基金a core-funded project(No.C16-M-034)of SIMTech,A*STAR Research Entities.
文摘The authors present a polymethyl methacrylate(PMMA)-based,reusable microsphere mask used in the laser sub-wavelength photolithography.In order to overcome the diffraction limit to achieve nano-structuring using l-|im laser wavelength,the photolithography technique was conventionally characterized by applying a one-off monolayer of silica microspheres serving as Mie scatterers.Addressing the major limitation of this technique,which was that the monolayer of microspheres must be prepared on the sample surface prior to fabrication,the proposed hot press approach could firmly fuse the 1silica microspheres to the PMMA base without the use of adhesives.The PMMA-based microsphere mask could hence reduce the amount of work for the monolayer preparation and was proven reusable for at least 20 times without damage to top or bottom surfaces.Using the mask,dimples that were 0.7 pm in diameter and 40 nm in depth were produced on tool steel by a single pulse of picosecond laser irradiation.
