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作者： Lu, Yang-Ming Wong, Jing-Syun Hsu, Lien-Chung Master Program of Electro-Optical Engineering Department of Electrical Engineering National University of Tainan Tainan Taiwan Graduate Institute of Material Science and Engineering National Cheng Kung University Tainan Taiwan

Poly(3-hexylthiophene)/[6,6]-phenyl C61-butyric acid methyl ester bulk hetero-junction photovoltaic cells doped with indigo dye as a p-type solar collector were studied. Doping indigo increases the absorption of the visible light spectrum, as determined using ultraviolet-visible spectrophotometry analysis. The photocurrent was measured in air under a solar simulator with AM 1.5G illumination (100 mW/cm2). The best photovoltaic efficiency obtained was 2.55% after doping indigo into the cell. © 2012 Elsevier B.V.

关键词： Organic solar cells

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Evaluation of alternatives for offshore petroleum production system in deep and ultradeep water depth

Evaluation of alternatives for offshore petroleum production...

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ASME 2011 30th International Conference on Ocean, Offshore and Arctic engineering, OMAE2011

作者： Morooka, Celso K. De Carvalho, Maria Deolinda B.M. Faculty of Mechanical Engineering Department of Petroleum Engineering University of Campinas Campinas-SP Brazil Graduate Program Petroleum Science and Engineering University of Campinas Campinas-SP Brazil

ISBN: (纸本)9780791844335

Different equipments combined compose an offshore petroleum production system. Several development alternatives are available for a given offshore petroleum field. The selection of the most suitable system for a given scenario depends on field development characteristics and strategies such as its geographical location, water depth, environmental conditions and knowledge about similar systems already selected and in use for oil and gas production and available infrastructure in around. For the purpose of field production system design a database with types of production platforms, mooring systems, subsea equipments, reservoir main characteristics, type of wells and lifting processes is fundamental. Today, offshore petroleum reservoir production is more and more complex due to several variables involved and requirement needed to meet deep and ultra deep water depth, pre-salt petroleum with aggressive fluid characteristics, fields in remote areas and other environmental issues. Large fields in deep and ultra deep water are particularly challenging due to little availability of suitable platform types, among known concepts such as floating, production, storage and offloading unit (FPSO), semisubmersible, spar and tension leg platform (TLP). In the present paper, a database for worldwide offshore petroleum systems in use has been elaborated by searching data available in the literature. The database is organized for more than three hundred platforms distributed on more than four hundred different offshore oil fields. To serve as a basis for the conceptual design of a field production system, this database contains information such as type of the platform, field location, water depth, days for the first production, type of well, completion, mooring system, riser and offloading system. This information is structured for different water depth and environmental condition, for each field. From this database, analysis has been conducted for distribution of each type of platfo

关键词： Offshore oil wells

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Numerical Investigation on Super-cooled Large Droplet Icing of Fan Rotor Blade in Jet Engine

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Journal of Thermal science 2014年第5期23卷 432-437页

作者： Keisuke Isobe Masaya Suzuki Makoto Yamamoto Graduate School of Mechanical Engineering Tokyo University of Science6-3-1 NiijukuKatsushika-kuTokyo125-8585Japan Aviation Program Group Japan Aerospace Exploration Agency(JAXA)7-44-1 Jindaiji Higashi-machiChofu-shiTokyo182-8522Japan Department of Mechanical Engineering Tokyo University of Science6-3-1 NiijukuKatsushika-kuTokyo125-8585Japan

Icing(or ice accretion) is a phenomenon in which super-cooled water droplets impinge and accrete on a *** is well known that ice accretion on blades and vanes leads to performance degradation and has caused severe *** various anti-icing and deicing systems have been developed,such accidents still ***,it is important to clarify the phenomenon of ice accretion on an aircraft and in a jet ***,flight tests for ice accretion are very expensive,and in the wind tunnel it is difficult to reproduce all climate conditions where ice accretion can ***,it is expected that computational fluid dynamics(CFD),which can estimate ice accretion in various climate conditions,will be a useful way to predict and understand the ice accretion *** the other hand,although the icing caused by super-cooled large droplets(SLD) is very dangerous,the numerical method has not been established *** is why SLD icing is characterized by splash and bounce phenomena of droplets and they are very complex in *** the present study,we develop an ice accretion code considering the splash and bounce phenomena to predict SLD icing,and the code is applied to a fan rotor *** numerical results with and without the SLD icing model are *** this study,the influence of the SLD icing model is numerically clarified.

关键词： Ice Accretion Fan Rotor Blade Super-cooled Large Droplet Multi-physics Simulation

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Plasmonic bacteria on a nanoporous mirror via hydrodynamic trapping for rapid identification of waterborne pathogens

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Light(science & Applications) 2018年第1期7卷 359-367页

作者： Keumrai Whang Jong-Hwan Lee Yonghee Shin Wooju Lee Young Wan Kim Dongchoul Kim Luke P.Lee Taewook Kang Department of Chemical and Biomolecular Engineering Sogang UniversitySeoul 04107Korea Berkeley Sensor and Actuator Center Departments of BioengineeringElectrical Engineering and Computer ScienceBiophysics Graduate ProgramUniversity of CaliforniaBerkeleyBerkeleyCA 94720USA Department of Mechanical Engineering Sogang UniversitySeoul 04107Korea

A rapid,precise method for identifying waterborne pathogens is critically needed for effective disinfection and better ***,conventional methods,such as culture-based counting,generally suffer from slow detection times and low ***,we developed a rapid detection method for tracing waterborne pathogens by an innovative optofluidic platform,a plasmonic bacteria on a nanoporous mirror,that allows effective hydrodynamic cell trapping,enrichment of pathogens,and optical signal *** designed and simulated the integrated optofluidic platform to maximize the enrichment of the bacteria and to align bacteria on the nanopores and plasmonic mirror via hydrodynamic cell *** nanoparticles are self-assembled to form antenna arrays on the surface of bacteria,such as Escherichia coli and Pseudomonas aeruginosa,by replacing citrate with hydroxylamine hydrochloride in order to amplify the signal of the plasmonic optical *** to the synergistic contributions of focused light via the nanopore geometry,self-assembled nanoplasmonic optical antennas on the surface of bacteria,and plasmonic mirror,we obtain a sensitivity of detecting *** as low as 102 cells/ml via surface-enhanced Raman *** believe that our label-free strategy via an integrated optofluidic platform will pave the way for the rapid,precise identification of various pathogens.

关键词： mirror trapping precise

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Nanostethoscopy: Atomic force microscopy probe contact force versus measured amplitude of cardiomyocytic contractions

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Journal of Bionanoscience 2017年第4期11卷 319-322页

作者： Vyas, Varun Nagarajan, Neerajha Zorlutuna, Pinar Huey, Bryan D. Institute of Materials Science University of Connecticut StorrsCT06269 United States Department of Aerospace and Mechanical Engineering Bioengineering Graduate Program University of Notre Dame Notre DameIN46556 United States

Cardiomyocytes are one of the most active cells in the human body. Understanding their mechanical contractions via nanostethoscopy has given us better insight into the subtleties of contractions. There is extensive data available on the temporal behavior of contraction in a cardiomyocytes but little is known about how contact force of the AFM probe influences the measurement force of contractions i.e., mean beat force. This investigation suggests that in order to accurately measure mean beat force nanostethoscopy data should be analyzed from the lowest to the highest contact force. In this study optimal contact force was varied from 10 nN to 500 nN and it was observed that the maximum contraction i.e., mean beat force was highest at contact force of 250 nN. © 2017 American Scientific Publishers.

关键词： Atomic force microscopy

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Shifting of X-Ray Diffraction pattern peak on BaFe12O19 nanocrystalline produced by sol gel auto combustion method

Shifting of X-Ray Diffraction pattern peak on BaFe12O19 nano...

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International Conference on Advances in Manufacturing and materials engineering, ICAMME 2012

作者： Suastiyanti, Dwita Soegijono, Bambang Graduate Program of Material Science Department of Physics University of Indonesia Indonesia Mechanical Department of Indonesia Institute of Technology Serpong Indonesia Multiferroic Laboratory Department of Physics University of Indonesia Indonesia

ISBN: (纸本)9783037854983

Barium hexaferrite BaFe12O19 (BHF) is one of the great importance as permanent magnets, particularly for recording magnetic in microwave devices. Nanocrystalline BHF powders were prepared by sol gel auto combustion method in citric acid - metal nitrates system. Hence the mole ratios of Ba2+/Fe3+ were varied at 1:12;1:11.5 and 1:11 and with pH of 7 in all cases using amonia solution. For final formation of nanocrystalline BHF, heating process was done at 850oC for 10 hours in all mol ratios of Ba2+/Fe3+. The nanocrystallite size was calculated from broadening X Ray Diffraction (XRD) peaks using Scherrer formula. XRD data shows that BHF of ratio 1:12 has the same diffraction pattern with the ratio of 1:11 especially at higher value of 2 θ. Diffraction pattern of BHF with the ratio of 1:11.5 was fitting in exactly to the standard searching match and the highest value of best Figure of Merit (FoM) is 90% with the crystallite size of 22 nm. The best FoM and crystallite size for ratio of 1:12 and 1: 11 are 88% and 56 nm respectively. The diffraction peaks of BHF with the ratio of 1:12 and 1:11 are in the right side from of 1:11.5 since the amount of impurity of both is higher (12%) than of BHF with the ratio of 1:11.5 (10%). © (2012) Trans Tech Publications, Switzerland.

关键词： Sol-gels

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Nitrogen Pretreatment of Growth Substrates for Vacancy-Saturated MoS2

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ACS Applied materials and Interfaces 2023年第36期15卷 42746-42752页

作者： Yao, Yu-Chi Wu, Bo-Yi Chin, Hao-Ting Yen, Zhi-Long Ting, Chu-Chi Hofmann, Mario Hsieh, Ya-Ping Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan Graduate Institute of Opto-Mechatronics Department of Mechanical Engineering National Chung Cheng University Chia-Yi62102 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei10617 Taiwan

Two-dimensional transition-metal dichalcogenides (2D TMDCs) are considered promising materials for optoelectronics due to their unique optical and electric properties. However, their potential has been limited by the occurrence of atomic vacancies during synthesis. While post-treatment processes have demonstrated the passivation of such vacancies, they increase process complexity and affect the TMDC’s quality. We here introduce the concept of pretreatment as a facile and powerful route to solve the problem of vacancies in MoS2. Low-temperature nitridation of the sapphire substrate prior to growth provides a nondestructive method to MoS2 modification without introducing new processing steps or increasing the thermal budget. Spectroscopic characterization and atomic-resolution microscopy reveal the incorporation of nitrogen from the sapphire surface layer into chalcogen vacancies. The resulting MoS2 with nitrogen-saturated defects shows a decrease in midgap states and more intrinsic doping as confirmed by ab initio calculations and optoelectronic measurements. The demonstrated pretreatment method opens up new routes toward future, high-performance 2D electronics, as evidenced by a 3-fold reduction in contact resistance and a 10-fold improved performance of 2D photodetectors. © 2023 American Chemical Society

关键词： Molybdenum compounds

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Effect of phosphorus on the copper diffusion barrier properties of electroless CoWP films

Effect of phosphorus on the copper diffusion barrier propert...

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作者： Tsai, T.K. Wu, S.S. Hsu, C.S. Fang, J.S. Department of Materials Science and Engineering National Formosa University Huwei Taiwan Graduate Institute of Material Science and Green Energy Engineering National Formosa University Huwei Taiwan Department of Mechanical Engineering National Taiwan University of Science and Technology Taipei Taiwan

The properties of electroless CoWP barrier films with different phosphorus contents in Cu/CoWP/Si stacked samples were explored. The Cu/CoWP/Si stacked samples with 30 nm CoWP films, contained about 5.7, 8.2 and 10.8 at.% P, were prepared by electroless deposition, and then annealed in a rapid thermal annealer at a temperature between 300 and 700 °C. The effect of phosphorus content in CoWP film on the barrier properties in preventing copper diffusion and the failure of the Cu/CoWP/Si stacked samples after thermal annealing were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectrometer (EDS), Auger electron spectroscopy (AES), and sheet resistance measurement. Increasing the phosphorus content in the electroless CoWP film markedly improves the barrier properties. The failure temperature of Cu/CoWP/Si increased from 500 to 600 °C with the phosphorus content in CoWP film increasing from 5.7 to 10.8 at.%, and the failure of the Cu/CoWP/Si has mainly arisen from the interdiffusion of copper and cobalt during thermal annealing. © 2010 Elsevier B.V. All rights reserved.

关键词： Scanning electron microscopy

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Evaluating mechanism of banana pseudo-stem retting using seawater:A cost-effective surface pre-treatment approach

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Journal of Bioresources and Bioproducts 2024年第3期9卷 322-335页

作者： Prince Hotor Ahmed H.Hassanin Osbert Akatwijuka Mohamed A.H.Gepreel Mitsuo Yamamoto Yukie Saito Ahmed Abdel-Mawgood Egypt-Japan University of Science and Technology Biotechnology ProgramAlexandria GovernorateNew Borg Al Arab 21934Egypt Alexandria University Department of Textile EngineeringAlexandria GovernorateBab Sharqi 5424041Egypt Egypt-Japan University of Science and Technology Material Science and EngineeringAlexandria GovernorateNew Borg Al Arab 21934Egypt Graduate School of Agricultural and Life Sciences The University of TokyoBunkyo-KuTokyo 113-8657Japan

Retting has been employed to extract natural fibers from agricultural wastes as a biological and cost-effective approach for *** its global abundance,banana pseudo-stem is a promising agro-waste for lignocellulosic fiber *** this study,fibers were extracted from the pseudo-stems after being pre-treated under four conditions using seawater at room temperature for up to 35 d Bacterial isolation from the fresh seawater sample and screening for ligninolytic ability were *** load as well as laccase and manganese peroxidase enzyme activity profile assay during the retting duration were *** transform infrared(FT-IR)and X-day diffraction(XRD)analyses were also examined for both pre-treated and untreated extracted *** results shows that six out of the eight bacterial isolates had the ability to degrade *** treatments(Raw stem+Raw seawater)and(Autoclaved stem+Raw seawater)recorded the highest viable bacterial load of 9.24×102 and 4.46×102 CFU,respectively,on the 14th day of the retting ***,the highest laccase and manganese peroxidase enzymes activity was recorded for(Raw stem+Raw seawater)and(Autoclaved stem+Raw seawater)treatments in the second to the third *** FT-IR spectra of the pre-treated fibers revealed relative reductions in peaks attributed to polysaccharides and other amorphous substances for all retting *** XRD diffractogram revealed that the crystallinity index(CI)of pre-treated fibers increased in all seawater retting treatment ***,the CI for fibers pre-treated under enzymatic conditions were enhanced even after five *** analysis for selected bacterial isolates showed homology to sequences of Bacillus velezensis,Shewanella sp.L8–5,and Citrobacter amalonaticus and Bacillus subtilis j8 *** these findings,it was suggested that physical,biological,and chemical actions were collectively involved in the seawater retting process of banana ps

关键词： Seawater retting Banana pseudo-stem Natural fiber Enzyme activity Colony forming unit

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Accelerated oxidation of silicon due to x-ray irradiation

Accelerated oxidation of silicon due to x-ray irradiation

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12th European Conference on Radiation and Its Effects on Component and Systems, RADECS 2011

作者： Bhandaru, Shweta Zhang, En Xia Fleetwood, Daniel M. Reed, Robert A. Weller, Robert A. Weiss, Sharon M. Interdisciplinary Graduate Program in Material Science Vanderbilt University Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States

Enhanced rates of oxide growth have been observed on silicon when exposed to high-energy x-ray irradiation. This observed effect could potentially be utilized for remote total ionizing dose-sensing applications. ©... 详细信息

ISBN: (纸本)9781457705878

关键词： Silicon

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