http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Prevention of Natural Flowering in Pineapple (Ananas comosus) by Shading and Urea Application
Meng-Tzu Lin,Alfred Ming Chen1,Tzong-Shyan Lin,Ching-San Kuan,Ching-Lung Lee,Wen-Ju Yang 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.1
The year-round production of pineapple (Ananas comosus var. comosus) is often interrupted by natural flowering during winter in Taiwan. A stable and promising technique for preventing natural flowering is required. In this study, we have tested the effect of shading and urea application on the flowering of pineapple. Shading 90% of sun light(s) before mid-November delayed the natural flowering of pineapple and the delay was affected by the plant age. For pineapples planted less than 11 month before mid-November, applying 1% urea plus shading treatment (SN) completely inhibited natural flowering. All the flowering-inhibited plants could be forced to flower by applying calcium carbide. Long-term shading might result in a decreased number of fruitlets within a fruit. However, 6 weeks of recovery before forcing flowering was sufficient for plants to produce fruits with quality equal to that of the control plants. In winter, pineapple plants that were prone to flowering tended to accumulate more leaf starch and increase their C/N ratio. The SN treatment increased the leaf nitrogen concentration and thus effectively maintained a low leaf C/N ratio. Furthermore, flowering-inhibited plants exhibited a constantly low level of leaf starch during the winter and their flowering forced by calcium carbide did not accompany with leaf starch accumulation.
Ci-Wen Luo(Ci-Wen Luo),Yu-Hsiang Kuan(Yu-Hsiang Kuan),Wen-Ying Chen(Wen-Ying Chen),Chun-Jung Chen(Chun-Jung Chen),Frank Cheau-Feng Lin(Frank Cheau-Feng Lin ),Stella Chin-Shaw Tsai(Stella Chin-Shaw Tsa 한국역학회 2023 Epidemiology and Health Vol.45 No.-
OBJECTIVES: This cohort study investigated the correlation between Parkinson’s disease (PD) risk and chronic obstructive pulmonary disease (COPD) risk under particulate matter with an aerodynamic diameter ≤2.5 μm (PM2.5) exposure. METHODS: Data from the National Health Research Institutes of Taiwan were used in this study. The Environmental Protection Administration of Taiwan established an air quality monitoring network for monitoring Taiwan’s general air quality. COPD was indicated by at least 3 outpatient records and 1 hospitalization for COPD. After the implementation of age, sex, and endpoint matching at a 1:4 ratio, 137 patients and 548 patients were included in the case group and control group, respectively. Based on the 2005 World Health Organization (WHO) standards, monthly air particle concentration data were classified into the following 4 groups in analyses of exposure–response relationships: normal level, and 1.0, 1.5, and 2.0 times the WHO level ([concentration ≥2]×25 μg/m3×number of exposure months). RESULTS: A multivariate logistic regression revealed that the 1.0 and 1.5 WHO level groups did not significantly differ from the normal level group, but the 2.0 WHO level did (odds ratio, 4.091; 95% confidence interval, 1.180 to 14.188; p=0.038). CONCLUSIONS: Elevated PM2.5 concentrations were significantly correlated with an increased risk of PD among patients with COPD. Furthermore, exposure to high PM2.5 levels can further increase the risk of PD.
Generation of Acoustic waves using TAL pair
Kuan Chen 한국에너지기후변화학회 2010 에너지기후변화학회지 Vol.5 No.2
Two identical TA (ThermoAcoustic) lasers were constructed, tested, and characterized for the generation and manipulation of high-amplitude acoustic waves from heat. Pyrex glass tubes with one open end and ceramics used in automobile catalytic converters were employed to fabricate the TA lasers. The ceramic stack in each TA laser was heated by NiCr (nichrome) resistance heater wire at one end, and cooled at the other end by radiation and natural convection of atmospheric air. Generated acoustic energy and sound waves were analyzed for different power supply rates and laser position arrangements. Changes in wave amplitude and phase difference due to triggered excitation and cross talking of the two lasers were investigated. Also tested and characterized were the focusing and synchronization of the two TA laser outputs to manipulate the acoustic energy intensity. It was found the sound waves generated by a pair of identical TA lasers were almost 180 degrees out of phase when the openings of the two lasers were very close to each other, resulting in much lower sound energy level at the focusing point. When the two lasers were far apart, the phase difference between the sound waves of the two lasers varied with time. Amplitudes of both sound waves increased slightly when the two laser output waves were in phase.
Application of the Second Law of Thermodynamics to Energy Systems
Kuan Chen 한국에너지기후변화학회 2007 에너지기후변화학회지 Vol.2 No.2
The second law of thermodynamics has been applied to the analyses and optimizations of various energy systems. The increase of entropy principle-perhaps the most commonly used second-law statement-when applied to a composite thermodynamic system, is only a necessary, not a sufficient, condition for the second law to be satisfied. Negative entropy generation in some regions in a composite system may be cancelled by the positive entropy generation in other regions. In this case the total entropy generation of the system may be positive, but the second law of thermodynamics, which is a local and instantaneous law and should be satisfied everywhere and at ally instant, is violated in the regions of negative entropy generation.
Construction and Testing of a radiation-beam powered TA (ThermoAcoustic) washer for grease removal
Kuan Chen,David H. DaCosta,Yeongmin Kim,Seung Jin Oh(오승진),Wongee Chun(천원기) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.1
A small washer powered directly and solely by thermal radiation was constructed and tested to explore the feasibility of using solar energy or other types of thermal radiation for washing and cleaning. In principle, TA (ThermoAcoustic) washers have the benefits of simpler design and operation and fewer energy conversion processes, thus should be more energy efficient and cost less than electric washing/cleaning systems. The prototype TA converter we constructed could sustain itself with consistent fluid oscillations for more than 20 minutes when powered by either concentrated solar radiation or an IR (infrared) heater. The frequencies of water oscillations in the wash chamber ranged from 2.6 to 3.6 Hz. The overall conversion efficiency was lower than the typical efficiencies of TA engines. Change in water temperature had little effect on the oscillatory flow in the TA washer due to its low efficiency. On the other hand higher water temperatures enhanced grease removal considerably in our tests. Methods for measuring the overall conversion efficiency, frictional loss, and grease removal of the TA washing system we designed were developed and discussed.
Preparation of CueAg coreeshell particles with their anti-oxidation and antibacterial properties
Kuan-ting Chen,Dahtong Ray,Yu-hsien Peng,Yu-Chi Hsu 한국물리학회 2013 Current Applied Physics Vol.13 No.7
CueAg coreeshell particles were fabricated from Cu particles and silver sulphate with the environmental-friendly TA (tartaric acid, C4H6O6) as reducing and chelating agent in an aqueous system. The influences of [TA]/[Ag] and [Ag]/[Cu] molar ratios on the formation of Ag coatings on the Cu particles were investigated. The SEM images and SEMeEDS analyses showed that [TA]/[Ag] = 0.5 and [Ag]/[Cu]≥0.2, the Cu particles were coated with uniform Ag nanoparticles. XRD analyses revealed that for these CueAg particles heated at 250 ℃, the oxidation of Cu was significantly reduced. Both anti-Staphylococcus aureus (Gram-positive) and anti-Escherichia coli (Gram-negative) characteristics of this CueAg composite particles showed satisfactory antibacterial ability. The characteristics of the composite CueAg particles were discussed in detail.
Design of Three Phase Wye-Delta LLC Converter with Time Domain Analysis
Kuan-Hung Chen,Jing-Yuan Lin,Yi-Feng Lin,Yu-Chen Chang,Huang-Jen Chiu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In the paper, the performance of a 5 kW DC/DC Wye-Delta-based series resonant converter designed for 400V input voltage and 48V output voltage server power supply is evaluated. The paper also performs operation modes analysis, circuit characteristics analysis, and use time domain analysis on Wye-Delta-based series resonant converter for circuit design to replace FHA analysis due to waveform distortion. Finally, a full-load efficiency up to 96.07% and power-density up to 2.84W/cm3 server power supply is implemented.
Radiation energy transfer and maximum conversion efficiency
Chen, Kuan,Chun, Wongee Elsevier 2009 APPLIED ENERGY Vol.86 No.10
<P><B>Abstract</B></P><P>Radiation energy transfer is modeled as the enthalpy flux of photons across the boundary of a thermodynamic system. It is proved that this energy transfer process can be treated as heat transfer. Compression work must be applied to the system to push the photons out. The energy transfer rate and maximum conversion efficiency computed from the model are identical to those determined from the Stefan–Boltzmann law and the Carnot efficiency for blackbody radiation.</P>