The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Horng Huei Wu - One of the best experts on this subject based on the ideXlab platform.
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the effect of shoe sole tread Groove Depth on the friction coefficient with different tread Groove widths floors and contaminants
Applied Ergonomics, 2006Co-Authors: Kai Way Li, Horng Huei WuAbstract:Abstract Slipping and falling are common phenomena in both workplaces and our daily activities. The risks associated with slipping and falling are related to the materials of footwear/floor, contamination condition, and geometric design of the sole. Shoe soles of various tread design are very common. Tread pattern of the shoe affects friction especially under liquid-contaminated conditions. Verification of the effects of tread Groove Depth is significant in assisting designers in designing proper footwear for workers exposed to slippery floor conditions. In this study, we measured the friction coefficients using the Neolite footwear pads on the terrazzo, steel, and vinyl floors under three liquid-contaminated conditions. A Brungraber Mark II slipmeter was used. The footwear pads had tread Grooves with a width of either 3 or 9 mm. The Depth of the tread Grooves ranged from 1 to 5 mm. The results showed that tread Groove Depth affected the friction coefficients significantly. Higher friction values were recorded for footwear pads with deeper tread Grooves on wet and water–detergent-contaminated floors. The averaged coefficient of friction (COF) gain per tread Groove Depth increase in millimeter under these two surface conditions ranged from 0.018 to 0.108, depending on the tread Groove width, floor, and contaminant.
Kai Way Li - One of the best experts on this subject based on the ideXlab platform.
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the effect of shoe sole tread Groove Depth on the friction coefficient with different tread Groove widths floors and contaminants
Applied Ergonomics, 2006Co-Authors: Kai Way Li, Horng Huei WuAbstract:Abstract Slipping and falling are common phenomena in both workplaces and our daily activities. The risks associated with slipping and falling are related to the materials of footwear/floor, contamination condition, and geometric design of the sole. Shoe soles of various tread design are very common. Tread pattern of the shoe affects friction especially under liquid-contaminated conditions. Verification of the effects of tread Groove Depth is significant in assisting designers in designing proper footwear for workers exposed to slippery floor conditions. In this study, we measured the friction coefficients using the Neolite footwear pads on the terrazzo, steel, and vinyl floors under three liquid-contaminated conditions. A Brungraber Mark II slipmeter was used. The footwear pads had tread Grooves with a width of either 3 or 9 mm. The Depth of the tread Grooves ranged from 1 to 5 mm. The results showed that tread Groove Depth affected the friction coefficients significantly. Higher friction values were recorded for footwear pads with deeper tread Grooves on wet and water–detergent-contaminated floors. The averaged coefficient of friction (COF) gain per tread Groove Depth increase in millimeter under these two surface conditions ranged from 0.018 to 0.108, depending on the tread Groove width, floor, and contaminant.
Xiangang Luo - One of the best experts on this subject based on the ideXlab platform.
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Focal length modulation based on a metallic slit surrounded with Grooves in curved Depths
Applied Physics Letters, 2007Co-Authors: Haofei Shi, Xiangang LuoAbstract:According to the numerical calculation, the relative phase of emitting light scattered by surface plasmon in a single subwavelength metallic Groove can be modulated by the Groove Depth. The focal length of the slit-Groove-based focusing structures can be adjusted in certain value if the Groove Depths are arranged in traced profile. With the regulation of the Groove Depth profile, it is possible to modify the focus position in the precision of nanoscale without increasing the size of the nanodevice. The simulation results verify that the method is effective for the design of nano-optical devices such as optical microprobes.
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Beaming light from a subwavelength slit surrounded by an array of Grooves with different Depth
Proceedings of SPIE, 2005Co-Authors: Xiangang Luo, Changtao Wang, Haofei Shi, Hongtao GaoAbstract:In this paper, we discussed the beam focusing of light emerged from a subwavlength metallic slit surrounded by a set of Grooves with constant space and width but variant Depth at the exit side surface. Based on the numerical model presented by L. Martin-Moreno, F. J. Garcia-Vidal etc. (published in PRL 167401), we attempted to optimize Grooves Depth to obtain general beam manipulation, such as beam focusing. This attempt did not prove successful for many cases with variant focal length in our optimization practice, although some specific results display agreeable beam focusing with elongated focal Depth. Further numerical computation shows that the excited electromagnetic field intensity around Groove openings has a strong dependence on the Groove Depth, but the phase only vary with a maximum change value of π by tuning the Groove Depth. This property restricts greatly the modulation of electromagnetic field by just changing each Groove Depth. More geometrical parameters, including Groove space and width, are recommended for optimization in the design of nano metallic Groove and slit structures for specific beam manipulation.
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Nanoscopic field distribution of surface plasmon polaritons in asymmetric metallic films
Proceedings of SPIE, 2005Co-Authors: Haofei Shi, Xiangang Luo, Changtao Wang, Hongtao Gao, Xiaochun DongAbstract:In this paper, we investigated the electric field profiles and phase distribution at the metal interfaces of the structure, and then analyzed their dependence on the Groove Depth and distance between slit and Grooves though finite-difference time-domain (FDTD) simulation. Calculated results show that variant Groove Depth generates phase difference periodically, which indicates the existence of standing wave in the Groove. The results also show that the phase of the emission at each Groove is proportional to the distance travelled by the surface wave in one period. Based on these facts, a simple process of the transmission model is illuminated.
Ying-jay Yang - One of the best experts on this subject based on the ideXlab platform.
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Enhanced and partially polarized output of a light-emitting diode with its InGaN/GaN quantum well coupled with surface plasmons on a metal grating
Applied Physics Letters, 2008Co-Authors: Kun-ching Shen, Hung Lu Chen, Chi-feng Huang, Cheng-yen Chen, Yean-woei Kiang, C C Yang, Ying-jay YangAbstract:The enhanced and partially polarized output of a green light-emitting diode (LED), in which its InGaN/GaN quantum well (QW) couples with surface plasmons (SPs) on a surface Ag grating structure, is demonstrated. Compared with a LED sample without (flat) Ag coating, the total output intensity of an LED of SP-QW coupling can be enhanced by ~59% (~200)% when the grating period and Groove Depth are 500 and 30 nm, respectively. Also, a bottom-emission polarization ratio of 1.7 can be obtained under the condition of 15 nm in Groove Depth.
Erick Jourdain - One of the best experts on this subject based on the ideXlab platform.
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Variable Groove Depth Gratings and their Applications in Soft X‐ray Monochromators
AIP Conference Proceedings, 2007Co-Authors: François Polack, Bruno Lagarde, Mourad Idir, Audrey Liard Cloup, Erick JourdainAbstract:A Variable Groove Depth (VGD) grating is a laminar grating where the Depth of the Groove profile changes continuously along the grating lines. When illuminated by a narrow beam a few mm wide, they allow to adapt the Depth of the Groove profile the wavelength in use by simply translating the grating perpendicular to the dispersion plane. We show theoretically and experimentally that by varying the Groove Depth, either flux or harmonic contamination can be optimized. Low second harmonic contamination in the order of 5% at any energy should be obtained on SOLEIL monochromators equipped with VGD gratings.
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variable Groove Depth gratings and their applications in soft x ray monochromators
SYNCHROTRON RADIATION INSTRUMENTATION: Ninth International Conference on Synchrotron Radiation Instrumentation, 2007Co-Authors: François Polack, Bruno Lagarde, Mourad Idir, Audrey Liard Cloup, Erick JourdainAbstract:A Variable Groove Depth (VGD) grating is a laminar grating where the Depth of the Groove profile changes continuously along the grating lines. When illuminated by a narrow beam a few mm wide, they allow to adapt the Depth of the Groove profile the wavelength in use by simply translating the grating perpendicular to the dispersion plane. We show theoretically and experimentally that by varying the Groove Depth, either flux or harmonic contamination can be optimized. Low second harmonic contamination in the order of 5% at any energy should be obtained on SOLEIL monochromators equipped with VGD gratings.
