The Experts below are selected from a list of 9765 Experts worldwide ranked by ideXlab platform
Fuhui Wang - One of the best experts on this subject based on the ideXlab platform.
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An investigation on the continuous and uniform Thin Membrane passive film formed on sputtered nanocrystalline stainless steel
Corrosion Science, 2016Co-Authors: Tianshu Li, Bin Zhang, Ying Li, Fuhui WangAbstract:Abstract The Thin Membrane passive film on the sputtered nanocrystalline stainless steel was directly observed. The passive film was very uniform, continuous and showed a distinctly double-layered structure. The formation of such a protective passive film was mainly attributed to the nanocrystalline structure, the homogenous chemical composition and being free of the inclusions. The critical pitting temperature of the sputtered NCss was no longer a deterministic transition, but a relatively random transition with a wide temperature distribution, which was speculated to be governed by surface morphology.
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direct observation of Thin Membrane passive film over the growing pit on sputtered nanocrystalline austenitic stainless steel film
Electrochemistry Communications, 2015Co-Authors: Tianshu Li, Bin Zhang, Ying Li, Xiaolan Wang, Fuhui WangAbstract:Abstract Potentiostatic polarization with a temperature scan was applied to initiate formation of a single pit on a sputtered nanocrystalline austenitic stainless steel film and the Thin Membrane passive film over the growing pit was directly observed for the first time in this study. The results showed that the passive film consisted of two different layers, both of which exhibited an amorphous structure. The outer layer comprised of a Fe-enriched oxide, whereas the inner layer was a Cr-enriched oxide. Compared with conventional coarse-grained stainless steel, the passive film of sputtered nanocrystalline austenitic stainless steel possessed higher elastic modulus and hardness.
Fumihito Arai - One of the best experts on this subject based on the ideXlab platform.
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MHS - Design of micro-hole array for fixing ultra-Thin Membrane in tensile tests based on fluid analysis
2018 International Symposium on Micro-NanoMechatronics and Human Science (MHS), 2018Co-Authors: Shinya Sakuma, Yuichi Murozaki, Fumihito AraiAbstract:One of the biggest challenges for measuring the tensile characteristics of the human inner limiting Membrane (ILM) is the fixation of the ILM sample. As the thickness of ILM is only a few micrometers, traditional fixation method using clips is not applicable. Thus, we introduce a fixation method of using microflow to suck the ultra-Thin Membrane at micro-hole array. We analyzed the fluid condition and designed the micro-hole array for effective, convenient and repeatable fixation. At last, we fabricated the clamp unit with micro-hole array and conducted tensile tests of the ultra-Thin Membrane.
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CBS - Force Sensor Clamp for Fixation of Ultra-Thin Membrane Using Micro-hole Array for Tensile Characterization *
2018 IEEE International Conference on Cyborg and Bionic Systems (CBS), 2018Co-Authors: Shinya Sakuma, Yuichi Murozaki, Fumihito AraiAbstract:To develop the well mimicked tissue model for simulating the surgery containing mechanical interaction between the tissue and surgical tools, we should know the mechanical properties of human tissues. As for the measurement of mechanical properties of tissues, the tensile characterization of ultra-Thin Membrane is one of the challenges because of the difficulty in handling of Thin-Membrane. Therefore, we have previously proposed a tensile characterization system utilizing a developed force sensor clamp to evaluate the tensile and tearing characteristics of ultra-Thin Membrane. The force sensor clamp mainly consists of a force sensor based on a quartz crystal resonator (QCR) and a microfluidic chip having micro-hole array which is utilized a microfluidic suction clamp. In this paper, we discussed design strategy of the micro-hole array to fix the Membrane. Finally, tensile experiments of the inner limiting Membrane (ILM) samples are conducted to demonstrate the proposed measurement system.
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Force Sensor Clamp for Fixation of Ultra-Thin Membrane Using Micro-hole Array for Tensile Characterization*
2018 IEEE International Conference on Cyborg and Bionic Systems (CBS), 2018Co-Authors: Shinya Sakuma, Yuichi Murozaki, Fumihito AraiAbstract:To develop the well mimicked tissue model for simulating the surgery containing mechanical interaction between the tissue and surgical tools, we should know the mechanical properties of human tissues. As for the measurement of mechanical properties of tissues, the tensile characterization of ultra-Thin Membrane is one of the challenges because of the difficulty in handling of Thin-Membrane. Therefore, we have previously proposed a tensile characterization system utilizing a developed force sensor clamp to evaluate the tensile and tearing characteristics of ultra-Thin Membrane. The force sensor clamp mainly consists of a force sensor based on a quartz crystal resonator (QCR) and a microfluidic chip having micro-hole array which is utilized a microfluidic suction clamp. In this paper, we discussed design strategy of the micro-hole array to fix the Membrane. Finally, tensile experiments of the inner limiting Membrane (ILM) samples are conducted to demonstrate the proposed measurement system.
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Design of micro-hole array for fixing ultra-Thin Membrane in tensile tests based on fluid analysis
2018 International Symposium on Micro-NanoMechatronics and Human Science (MHS), 2018Co-Authors: Shinya Sakuma, Yuichi Murozaki, Fumihito AraiAbstract:One of the biggest challenges for measuring the tensile characteristics of the human inner limiting Membrane (ILM) is the fixation of the ILM sample. As the thickness of ILM is only a few micrometers, traditional fixation method using clips is not applicable. Thus, we introduce a fixation method of using microflow to suck the ultra-Thin Membrane at micro-hole array. We analyzed the fluid condition and designed the micro-hole array for effective, convenient and repeatable fixation. At last, we fabricated the clamp unit with micro-hole array and conducted tensile tests of the ultra-Thin Membrane.
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MHS - Mechanical characterization of ultra-Thin Membrane using force sensing chip
2017 International Symposium on Micro-NanoMechatronics and Human Science (MHS), 2017Co-Authors: Noriaki Hasegawa, Shinya Sakuma, Yuichi Murozaki, Fumihito AraiAbstract:Measuring mechanical properties of tissues have been important. Since these living samples generally have a nonlinearity between deformation amount and reaction force, a force sensor having wide measurement range with high resolution is highly demanded. In addition, ultra-Thin Membrane such as inner limiting Membrane (ILM) has difficulty on clamping method because of its thickness. In study, we present measurement system of ultra-Thin Membrane using the quartz crystal resonator (QCR) load sensor and suction fixation devices using MEMS process. We succeed in tensile test of poly(vinyl alcohol) film which is simulating ILM in liquid environment by using constructed system.
J. Huang - One of the best experts on this subject based on the ideXlab platform.
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Aperture-Coupled Thin-Membrane L-Band Antenna
2007Co-Authors: J. HuangAbstract:The upper part of the figure depicts an aperture-coupled L-band antenna comprising patterned metal conductor films supported on two Thin polyimide Membranes separated by an air gap. In this antenna, power is coupled from a microstrip line on the lower surface of the lower Membrane, through a slot in a metal ground plane on the upper surface of the lower Membrane, to a radiating metal patch on the upper surface of the upper Membrane. The two-Membrane configuration of this antenna stands in contrast to a three-Membrane configuration heretofore considered as the basis for developing arrays of dual-polarization, wideband microwave antennas that could be Thin and could be, variously, incorporated into, or supported on, Thin structures, including inflatable structures. By reducing the number of Membranes from three to two, the present design simplifies the problems of designing and fabricating such antennas or arrays of such antennas, including the problems of integrating such antennas or arrays with Thin-Membrane-mounted transmit/ receive modules. In addition, the use of aperture (slot) coupling eliminates the need for rigid coaxial feed pins and associated solder connections on Thin Membranes, making this antenna more mechanically reliable, relative to antennas that include coaxial feed pins. This antenna is designed for a nominal frequency of 1.26 GHz. The polyimide Membranes are 0.05 mm thick and have a relative permittivity of 3.4. The radiating patch is square, 8.89 cm on each side. This radiating patch lies 1.27 cm above the ground plane. The feeding microstrip line is 0.12 mm wide and has a characteristic impedance of 50 . The aperture-coupling slot, etched in the ground plane, is 0.48 mm wide and 79.5 mm long. In order to maximize coupling, the microstrip line is extended beyond the middle of the slot by a length of 36 mm, which corresponds to a transmission- line electrical length of about a quarter wavelength. The other end of the microstrip line is transformed to a 50-Ohm coplanar waveguide line, which is used for connection to a transmit/receive module. Some plated-through vias are added to the outer conductors of the coplanar waveguide to suppress parallel-plate modes. The measured and calculated 10-dB-return-loss bandwidth of the antenna is 100 MHz. By eliminating the radiating patch and the upper Membrane that supports it, and performing two other simple modifications, one can convert the two-Membrane antenna described above to a paper-Thin single-Membrane antenna, shown in the lower part of the figure. One modification is to increase the slot length to 104.95 mm; the other is to extend the microstrip to 36.68 mm past the middle of the slot. With these modifications, the slot now becomes a half-wavelength radiator with a nearly omnidirectional radiation pattern. In one potential use, such a paper-Thin antenna could be pasted on an automobile window to enable omnidirectional communication.
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Aperture-coupled Thin-Membrane microstrip array antenna for beam scanning application
2005 IEEE Antennas and Propagation Society International Symposium, 2005Co-Authors: J. Huang, G. Sadowy, C. Derksen, L. Del Castillo, P. Smith, J. Hoffman, T. Hatake, A. MoussessianAbstract:A microstrip array using an aperture-slot-coupling technique with very Thin Membranes has been developed at the L-band frequency for a beam scanning application. This technology-demonstration array with 4/spl times/2 elements achieved a relatively wide bandwidth of 100 MHz (8%) and /spl plusmn/45/spl deg/ beam scan. Very narrow coupling slots were used with each having an aspect ratio of 160 (conventional slot aspect ratio is between 10 to 30) for coupling through a very Thin Membrane (0.05 mm thickness). This Thin-Membrane aperture-coupling technique allows the array antenna elements to be more easily integrated with transmit/receive amplifier (T/R) and phase shifter modules. The paper addresses only the radiator portion of the array. The array and active components will be presented in a separate paper.
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Paper-Thin Membrane aperture-coupled L-band antennas
IEEE Transactions on Antennas and Propagation, 2005Co-Authors: J. HuangAbstract:A microstrip line on very Thin Membrane substrate (0.05 mm) is slot-coupled through a thick air substrate (12.7 mm) to excite an L-band radiating patch element. A breadboard unit achieved a relatively wide bandwidth of 100 MHz (8%). Very narrow coupling slot is used with aspect ratio of 160 (conventional slot aspect ratio is between 10 to 30). This new feed design makes the Thin-Membrane or inflatable array antenna technology more practical. It reduces the number of Thin-Membrane layers required for a dual-pol wide-band inflatable array from three layers in a previous design to two layers. In addition, this technology allows the Thin-Membrane array antenna elements to be readily integrated with Thin-Membrane-mounted transmit/receive (T/R) modules. Calculation shows that, without the patch, the microstrip line and slot combination can also radiate as a paper-Thin (0.05 mm) radiator at the L-band frequencies.
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Thin-Membrane aperture-coupled L-band patch antenna
IEEE Antennas and Propagation Society Symposium 2004., 2004Co-Authors: J. Huang, A. MoussessianAbstract:A microstrip line on very Thin Membrane substrate (0.05mm) is slot-coupled through a thick air substrate (12.7mm) to excite an L-band radiating patch element. It achieved a relatively wide bandwidth of 100 MHz (8%). A very narrow coupling slot is used with aspect ratio of 160 (conventional slot aspect ratio is between 10 to 30). This new feed design makes the Thin-Membrane or inflatable array antenna technology more practical. It reduces the number of Thin-Membrane layers required for a dual-polarised wideband inflatable array from three layers in a previous design to two layers. In addition, this technology allows the Thin-Membrane array antenna elements to be readily integrated with Thin-Membrane-mounted transmit/receive (T/R) modules.
Tianshu Li - One of the best experts on this subject based on the ideXlab platform.
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An investigation on the continuous and uniform Thin Membrane passive film formed on sputtered nanocrystalline stainless steel
Corrosion Science, 2016Co-Authors: Tianshu Li, Bin Zhang, Ying Li, Fuhui WangAbstract:Abstract The Thin Membrane passive film on the sputtered nanocrystalline stainless steel was directly observed. The passive film was very uniform, continuous and showed a distinctly double-layered structure. The formation of such a protective passive film was mainly attributed to the nanocrystalline structure, the homogenous chemical composition and being free of the inclusions. The critical pitting temperature of the sputtered NCss was no longer a deterministic transition, but a relatively random transition with a wide temperature distribution, which was speculated to be governed by surface morphology.
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direct observation of Thin Membrane passive film over the growing pit on sputtered nanocrystalline austenitic stainless steel film
Electrochemistry Communications, 2015Co-Authors: Tianshu Li, Bin Zhang, Ying Li, Xiaolan Wang, Fuhui WangAbstract:Abstract Potentiostatic polarization with a temperature scan was applied to initiate formation of a single pit on a sputtered nanocrystalline austenitic stainless steel film and the Thin Membrane passive film over the growing pit was directly observed for the first time in this study. The results showed that the passive film consisted of two different layers, both of which exhibited an amorphous structure. The outer layer comprised of a Fe-enriched oxide, whereas the inner layer was a Cr-enriched oxide. Compared with conventional coarse-grained stainless steel, the passive film of sputtered nanocrystalline austenitic stainless steel possessed higher elastic modulus and hardness.
Bin Zhang - One of the best experts on this subject based on the ideXlab platform.
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An investigation on the continuous and uniform Thin Membrane passive film formed on sputtered nanocrystalline stainless steel
Corrosion Science, 2016Co-Authors: Tianshu Li, Bin Zhang, Ying Li, Fuhui WangAbstract:Abstract The Thin Membrane passive film on the sputtered nanocrystalline stainless steel was directly observed. The passive film was very uniform, continuous and showed a distinctly double-layered structure. The formation of such a protective passive film was mainly attributed to the nanocrystalline structure, the homogenous chemical composition and being free of the inclusions. The critical pitting temperature of the sputtered NCss was no longer a deterministic transition, but a relatively random transition with a wide temperature distribution, which was speculated to be governed by surface morphology.
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direct observation of Thin Membrane passive film over the growing pit on sputtered nanocrystalline austenitic stainless steel film
Electrochemistry Communications, 2015Co-Authors: Tianshu Li, Bin Zhang, Ying Li, Xiaolan Wang, Fuhui WangAbstract:Abstract Potentiostatic polarization with a temperature scan was applied to initiate formation of a single pit on a sputtered nanocrystalline austenitic stainless steel film and the Thin Membrane passive film over the growing pit was directly observed for the first time in this study. The results showed that the passive film consisted of two different layers, both of which exhibited an amorphous structure. The outer layer comprised of a Fe-enriched oxide, whereas the inner layer was a Cr-enriched oxide. Compared with conventional coarse-grained stainless steel, the passive film of sputtered nanocrystalline austenitic stainless steel possessed higher elastic modulus and hardness.
