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Meng Su,Juergen Brugger,Beomjoon Kim 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.3
Triboelectric nanogenerators (TENGs) have proven to be a robust power source for effi ciently converting environmental mechanical energy into electricity. Triboelectric technology experienced substantial growth in the past few years, especially in the fi eld of green wearable power sources as the Internet of Things develops. However, it is still diffi cult to overcome some remaining bottlenecks for wearable TENGs, such as limited choice of materials, unsafe metal electrodes, complex structures, and fi nally an insuffi cient electrical output. In this work, we present a simply structured wearable TENG that delivers usable electric power based on human motion. The form of TENG, which combines a friction material of silk and an electrode material of carbon nanotube (CNT) in liquid phase to achieve a biodegradable conductive mixing friction layer is new and unique. A series of delicate investigative experiments were conducted to clarify the impacts of various parameters and their optimal values in the fabrication. Then the special mixing layer was attached to a glove and tested with various daily actions, showing high potential as a power source for wearable electronics and as a motion sensor itself. This new form of CNT-silk TENG will push the fi eld’s development toward actual use, with lower cost and less burden for both of production and usage, with the advanced features of high softness, high sensibility, light weight, and simple structure.
Park, Chan Woo,Mena, Oscar Vazquez,Brugger, Jü,rgen IOP Pub 2007 Nanotechnology Vol.18 No.4
<P>We propose a new process for forming parallel nanobridge patterns by nanostencil lithography. In this process, a low-stress silicon nitride stencil with parallel nanobridge structures is fabricated by a new edge patterning technique where those nanobridges are formed simultaneously via sidewall features using the conventional photolithography and anisotropic dry etching process. After forming primary Cr patterns on the oxidized Si substrate by depositing Cr through the edge-patterned stencil, those patterns are transferred onto the underlying Si layer in a reversed manner, leading to the formation of parallel Cr nanobridge patterns on the Si substrate. Using this process, we have successfully produced 85 nm-wide parallel Cr nanobridge patterns from a stencil with 115 nm-wide nanobridge structures that was fabricated by conventional microlithography. As there is no need for advanced lithography techniques in preparing the nanobridge stencil, the combination of the edge patterning and reverse nanostencil process provides a cost-effective tool for the massive fabrication of parallel nanobridge arrays at the 100 nm scale. </P>
김규만(Gyu Man Kim),유르겐 부르거(Juergen Brugger) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.8
A new tool of surface patterning technique for general purpose lithography was developed based on shadow mask method. This paper describes the fabrication of a new type of miniaturized shadow mask. The shadow mask is fabricated by photolithography and etching of 100-㎜ full wafer. The fabricated shadow mask has over 388 membranes with apertures of micrometer length scale ranging from 1 ㎛ to 100s ㎛ made on each 2㎜×2㎜ large low stress silicon nitride membrane. It allows micro scale patterns to be directly deposited on substrate surface through apertures of the membrane. This shadow mask method has much wider choice of deposit materials, and can be applied to wider class of surfaces including chemical functional layer, MEMS/NEMS surfaces, and biosensors.
Past, Present and Future of the n_TOF Facility at CERN
E. Chiaveri,S. Andriamonje,M. Calviani,V. Vlachoudis,M. Brugger,P. Cennini,F. Cerutti,M. Chin,A. Ferrari,Y. Kadi,E. Lebbos,R. Losito,C. Guerrero,V. Becares,D. Cano-Ott,M. Fernandez-Ordonez,E. Gonzalez 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The n_TOF spallation neutron facility is operating at CERN since 2001. Neutrons are produced with a very wide energy range, from thermal up to 1 GeV and with a very high instantaneous flux (10^5n/cm^2/pulse at 200 m from target) thanks to the high intensity (7 × 10^(12) protons/pulse) and low repetition rate of the Proton Synchrotron (PS) which is delivering protons to a lead spallation target. The experimental area is located at 200 m from the target, resulting in a very good energy resolution and beam quality thanks to the adoption of an optimal collimation system. At the end of 2008 the n_TOF facility has resumed operation after a halt of 3 years due to technical issues. This contribution will outline the main physics results obtained by the facility since its inception in 1999, and show the importance of the measured nuclear data in the field of Nuclear Astrophysics and Nuclear Technology. Then it will present the future perspectives of the facility, aiming mainly in the direction of measuring highly radioactive samples, for which the facility has unique capabilities, with a lower background.
The Role of Fe and Ni for S-Process Nucleosynthesis and Innovative Nuclear Technologies
G. Giubrone,J. L. Tain,C. Lederer,A. Pavlik,A. Wallner,S. Andriamonje,M. Brugger,M. Calviani,F. Cerutti,E. Chiaveri,A. Ferrari,Y. Kadi,E. Lebbos,V. Vlachoudis,J. Andrzejewski,J. Marganiec,J. Perkowski 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The accurate measurement of neutron capture cross sections of all Fe and Ni isotopes is important for disentangling the contribution of the s-process and the r-process to the stellar nucleosynthesis of elements in the mass range 60 < A < 120. At the same time, Fe and Ni are important components of structural materials and improved neutron cross section data is relevant in the design of new nuclear systems. With the aim of obtaining improved capture data on all stable iron and nickel isotopes, a program of measurements has been launched at the CERN Neutron Time of Flight Facility n_TOF.