Solar energy could become the most attractive alternative energy source. In this study we test an attractive new candidate material for solar energy collectors. It can be found that the higher the gas pressure is, the...
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Solar energy could become the most attractive alternative energy source. In this study we test an attractive new candidate material for solar energy collectors. It can be found that the higher the gas pressure is, the higher the sp2/sp3 area ratio, the greater the sputtering rate and the greater the optical absorption. The photothermal conversion efficiency of a SiO2 coating on the amorphous diamond-like carbon (a-dLC) selective absorber films deposited on the Cr/mirror like Al substrate is 93.2% as the film thickness of a SiO2 coating is 105 nm. The coatings also increase the protective properties for a longer service life. This makes the SiO2 coated a-dLC film a promising new candidate material for solar selective absorber films. The SiO2/a-dLC selective absorber films also were deposited on the Al extrusion substrates.
The mobile phone antennas exhibit a very low real impedance value especially in lower LTE (698-787MHz) and GSM (824-960MHz) bands, since the antennas are electrically small compared to operating wavelengths at these b...
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The mobile phone antennas exhibit a very low real impedance value especially in lower LTE (698-787MHz) and GSM (824-960MHz) bands, since the antennas are electrically small compared to operating wavelengths at these bands. Obtaining sufficiently low reflection coefficient and high TrP in a considerable bandwidth from such an antenna is very challenging without exciting proper currents on the PCB of the device. So the main trend for mobile handset antennas has moved toward using an electrically-small coupler plate to excite those PCB currents. In this way, the input impedance of the coupling element-chassis combination has a relatively high real part and the quality factor of the system is now much more lower than traditional resonant antennas, enabling higher bandwidth potential with the help of a proper matching network. In this paper, this approach is followed to cover lower LTE (698787MHz) and GSM (824-960MHz) standards with a novel hollow coupling element antenna while keeping space available around and inside the antenna, for additional components or even another higher band antenna (dCS/PCS and UMTS).
Homoepitaxial growth on 4H-SiC Si-face substrates with sizes corresponding to 150 mm was carried out. The influence of growth conditions for uniformity and epitaxial defect density was investigated. A 150 mm size was ...
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Homoepitaxial growth on 4H-SiC Si-face substrates with sizes corresponding to 150 mm was carried out. The influence of growth conditions for uniformity and epitaxial defect density was investigated. A 150 mm size was realized by using two 76.2 mm wafers lined up in a radial direction. C/Si ratio is found to be a major parameter for controlling triangulardefect density and the generation of step bunching. As a result, the surface morphology without bunched step structure and the triangulardefect density with 0.5 cm−2 were obtained by decreasing C/Si ratio to 1.0 on the size corresponding to 150 mm. Under this condition, good carrier concentration and thickness uniformity of σ/mean =15.2 % and 1.7 % could be obtained.
40GHz radio over fibre (rOF) downlink system is constructed to demonstrate Hd video transmission capability using the hybrid optical and wireless system. The dual-sideband optical carrier suppression (dSB-OCS) techniq...
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40GHz radio over fibre (rOF) downlink system is constructed to demonstrate Hd video transmission capability using the hybrid optical and wireless system. The dual-sideband optical carrier suppression (dSB-OCS) technique is used in conjunction with the minimum transmission bias (MiTB) to generate optical millimetre wave signal by utilizing a dual electrode Mach-Zehnder modulator (dE-MZM). A baseband high definition (Hd) video signal is modulated into the system via a second MZM. The signal is distributed to a remote antenna unit (rAU) using a 20km optical fibre, then transmitted wirelessly to a customer premise equipment (CPE) located at 5m away. The results show that the Hd video is successfully transmitted over the error free 40GHz rOF downlink system.
作者：
Nakagaki, PaulAber, JoshFetterhoff, Terry1: is the Head of New Innovation Models in Roche Partnering
where he explores alternatives to the conventional innovation models currently used in Roche. He has 23 years of experience in the pharmaceutical industry including business development chemistry manufacturing and controls and R&D strategy. He has a PhD in synthetic organometallic chemistry from the University of Wisconsin. 2: is a director of technology and innovation management working in the Roche Diagnostics Chief Technology Office. He has been with Roche for 13 years engaged in technology strategy assessment and partnering activities. He is a member of the Roche global open innovation work team and is actively working to establish best practices for innovation management at Roche. Josh has a BS in biology from the University of California at Santa Barbara and an MBA from St. Marys College. 3: has 30 years of experience in technology management and currently works at Roche Diagnostics as senior director of technology management and Head of the U.S. Chief Technology Office. In this capacity he oversees the identification and evaluation of emerging technologies relevant to the future of clinical diagnostics and is responsible for global open innovation initiatives within Roche Diagnostics. Terry received a Masters degree in pathology from the University of Western Australia.
Implementing open innovation approaches in a corporation that traditionally has relied on a closed innovation model will always be challenging. This paperdescribes our attempt to create an open innovation capability ...
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Implementing open innovation approaches in a corporation that traditionally has relied on a closed innovation model will always be challenging. This paperdescribes our attempt to create an open innovation capability at roche in both the pharmaceuticals anddiagnostics divisions. In the journey, we have concluded that the navigation of two important hurdles drives any large company's ability to embrace open innovation: creating the eureka moment that so vividly illustrates the value of open innovation activities that senior management no longer questions the need for them and shifting the company mindset to an open innovation culture.
Modified TiO2 films have been prepared by combining commercial titania powders （degussa P25） with sol-gel made by titanium chloride （Ti-sol）. The result shows that clusters are formed by nanoparticles and large po...
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Modified TiO2 films have been prepared by combining commercial titania powders （degussa P25） with sol-gel made by titanium chloride （Ti-sol）. The result shows that clusters are formed by nanoparticles and large pores can be seen on the surface of the TiO2 films. The short circuit photocurrent density and photoelectric conversion efficiency of the solar cells are obviously enhanced compared with those without modification. The relationship between the photoelectric conversion efficiency and the amount of Ti-sol was investigated. With the addition of 30 wt% Ti-sol, the photoelectric conversion efficiency as high as 9.75% is achieved, increasing by 28.3% compared with the solar cells without modification.
A new pixel circuit with pixel memory is proposed for field sequential colordisplay. The new pixel circuit associated with its unique driving scheme can solve voltage residue problem.
A new pixel circuit with pixel memory is proposed for field sequential colordisplay. The new pixel circuit associated with its unique driving scheme can solve voltage residue problem.
Instability of amorphous silicon TFT has been a major challenge in designing a shift register of gate driver. We proposed in this paper a novel amorphous silicon gate driver (ASG). A 2.8 inch QVGA TFT-LCd prototype dr...
Instability of amorphous silicon TFT has been a major challenge in designing a shift register of gate driver. We proposed in this paper a novel amorphous silicon gate driver (ASG). A 2.8 inch QVGA TFT-LCd prototype driven by proposed ASG has been successfully fabricated. Stable operation within 240 hours at 70 °C temperature has been demonstrated without noticeable failure or artifacts.
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