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Rapid Synthesis of Piezoelectric ZnO-Nanostructures for Micro Power-Generators

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journal of Materials Science & Technology 2013年第10期29卷 893-897页

作者： Nai-Feng Hsu Tien-kan chung Ming Chang Hong-jun Chen Department of General Education Army Academy Department of Mechanical Engineering National Chiao Tung University Department of Mechanical Engineering Chung Yuan Christian University State key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology

In this paper, we report a rapid synthesis of piezoelectric ZnO-nanostructures and fabrication of the nanostructures- based power-generators demonstrating an energy conversion from an environmental mechanical/ultrasonic energy to an electrical energy. The ZnO nanostructures are grown on a silicon wafer by a modified chemical solution method （CSD, chemical-solution-deposition） with a two-step thermal-oxidation approach. The synthesis process can be completed within 1 h. By varying the mixture-ratio of Zn micro-particles in an oxalic acid solution with 0.75 mol/l concentration in the CSD process, the growth mechanism is well-controlled to synthesize three different types of ZnO-nanostructures （i.e., dandelion-like nanostructures, columnar nanostructures, and nanowires）. Furthermore, through oxidizing at different temperatures in the thermal-oxidation process, the featured geometry of the nanostructures （e.g., the length and diameter of a nanowire） is modified. The geometry, size, morphology, crystallization, and material phase of the modified nanostructures are characterized by scanning electron microscopy and X-ray diffraction. Finally, the nanostructures are used to fabricate several micro power-generators. Through the piezoelectric effect, a maximum current density output of 0.28 μA cm-2 generated by a power-generator under an ultrasonic wave is observed.

关键词： Piezoelectric ZnO nanostructures Chemical solution method Thermal-oxidation Power-generator

Effects of C/N ratio on nitrate removal and floc morphology of autohydrogenotrophic bacteria in a nitrate-containing wastewater treatment process

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journal of Environmental Sciences 2018年第7期30卷 52-60页

作者： Tran Ngoc Phu Nguyen Shu-ju Chao Pei-chung Chen Chihpin Huang Institute of EnvironmentaZ Engineering National Chiao Tung University Hsinchu 300 Chinese Taipei

The effects of C/N ratio of a nitrate-containing wastewater on nitrate removal performed by autohydrogenotrophic bacteria as well as on the morphological parameters of floc such as floc morphology, floc number distribution, mean particle size（MPS）, aspect ratio and transparency were examined in this study. The results showed that the nitrate reduction rate increased with increasing C/N ratio from 0.5 to 10 and that the nitrogen removal of up to 95% was found at the C/N ratios of higher than 5（between 0.5–10）. Besides, high C/N ratio values reflected a corresponding high nitrite accumulation after 12-hr operation, and a fast decreasing rate of nitrite in the rest of operational time. The final p H values increased with the C/N ratio increasing from 0.5 to 2.5, but decreased with the C/N ratio increasing from2.5 to 10. There were no significant changes in floc morphology with the MPSs ranging from35 to 40 μm. Small and medium-sized flocs were dominant in the sludge suspension, and the number of flocs increased with the increasing C/N ratios. Furthermore, the highest apparent frequency of 10% was observed at aspect ratios of 0.5 and 0.6, while the transparency of flocs changed from 0.1 to 0.7.

关键词： Autohydrogenotrophic bacteria C/N ratio Floc morphology Nitrate reduction Nitrite accumulation Nitrogen removal

Landscape structure and bird's diversity in the rural areas of Taiwan

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journal of Environmental Sciences 2003年第2期15卷 241-248页

作者： Chun-Yen-Chang (Department of Horticulture, “National chung Hsing University”, Taichung, Taiwan, China) Department of Horticulture National Chung Hsing University Taichung Taiwan

This study tries to discuss the relationship between landscape structure and organisms in the perspective of landscape architecture. The research hypotheses were then proposed as (1) there are relationships between landscape structure indexes and birds' diversity in the rural areas of Taiwan; (2) the relationships between landscape structure and birds' diversity will be different in different hierarchical levels. In order to increase the bird species, landscape planners could tries to increase the density of water bodies, but decrease the farms and human planted woods. Decrease the density of constructed and human planted grasslands. Increase the area of un-worked acres, natural grasslands, and the area of water bodies and circular the water bodies and natural forest. In order to increase birds' diversity, landscape planners could decrease the concentration of paved areas. Concentrate the human planted trees to increase the core areas of woodlands. Increase the area of natural grassland circular. In order to increase the total number of birds in the planning areas, landscape planners could scattered the paved areas and lengthen the constructed areas. Decreases the core region of the constructed areas. Increase the area of un-worked acres and water bodies. Decrease the disturbance of both the interior area of natural and human planted woodlands and try to increase the density of water bodies.;The analysis results showed that the small grain size indexes are more suitable for the rural areas of Taiwan to capture the influential factors of bird communities. The high fragmentation of land usages in Taiwan lessens the influences of the regional landscape pattern.

关键词： landscape structure bird diversity Taiwan

Numerical analysis of straight and curved underground pipeline performance after rehabilitation by cured-in-place method

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Underground Space 2020年第1期5卷 30-42页

作者： k.j.Shou C.C.Huang Department of Civil Engineering Chung Hsing University250Kuo Kuang RoadTaichungTaiwanRepublic of China Department of Civil EngineeringChung Hsing University250Kuo Kuang RoadTaichungTaiwanRepublic of China

Underground pipelines are prone to damage by corrosion in Taiwan due to the humid climate and the aging and overuse of ***-dig technologies are necessary,as the cities in Taiwan are highly *** methods,including the cured-in-place pipe(CIPP)method,provide an alternative to the new no-dig installation methods,which are comparatively more *** this study,the numerical analysis software ABAQUS was used to simulate straight-line and curved underground pipelines damaged by *** calibration by small-scale physical modeling in the laboratory,numerical models were applied to the analysis of the mechanical behavior of straight-line and curved underground *** analyze the performance of the CIPP rehabilitation method,different scenarios for straight-line and curved pipelines were *** included before-and after-rehabilitation,different internal pressures and surface loading conditions,and different liner deformabilities and pipe-liner interface *** results suggest that the CIPP method can reinforce damaged pipes by reducing stress concentration and differential displacement near the corrosion ***,proper liner thickness,liner material properties,and pipe-liner interface strength are essential for well-designed CIPP rehabilitation.

关键词： Straight-line pipeline Curved pipeline No-Dig Rehabilitation Cured-in-place-pipe Soil-pipe interaction

Numerical Study on Breaking Criteria for Solitary Waves

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China Ocean Engineering 2003年第4期18卷 589-604页

作者： chung-ren CHOU Ruey-syan SHIH john Z. YIM Department of Harbor and River Engineering Taiwan Ocean University Keelung ChinaDepartment of Civil Engineering Tung Nan Institute of Technology Taipei ChinaDepartment of Harbor and River Engineering Taiwan Ocean University Keelung China

Studies of the breaking criteria for solitary waves on a slope are presented in this paper. The boundary element method is used to model the processes of shoaling and breaking of solitary waves on various slopes. Empirical formulae that can be used to characterize the breaking of solitary waves are presented. These include the breaking index, the wave height, the water depth, and the maximum particle velocity at the point of breaking. Comparisons with the results of other researches are given.

关键词： boundary element breaking indices empirical formula solitary wave

Characterizing pressure fluctuation into single-loop oscillating heat pipe

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journal of Central South University 2012年第9期19卷 2578-2583页

作者： PARk Yong-ho Md.Riyad Tanshen Md.j.Nine chung Han-shik jEONG Hyo-min Department of Mechanical Engineering Koje CollegeJangseungpoKojeGyeongnamKorea Department of Mechanical and Precision Engineering Gyeongsang National University 445 Inpyeong-dongTongyeongGyeongnam650-160Korea Department of Energy and Mechanical Engineering Institute of Marine IndustryGyeongsang National UniversityCheondaegukchi-Gil 38TongyeongGyeongnam650-160Korea

The pressure characteristics inside single loop oscillating heat pipe （OHP） having 4.5 mm inner diameter copper tube with the loop height of 440 mm were addressed. Distilled water was used as working fluid inside the OHP with different filling ratios of 40%, 60% and 80% of total inside volume. Experimental results show that the thermal characteristics are significantly inter-related with pressure fluctuations as well as pressure frequency. And the pressure frequency also depends upon the evaporator temperature that is maintained in the range of 60-96 ℃. Piezoresistive absolute pressure sensor （Model-kistler 4045A5） was used to take data. The investigation shows that the filling ratio of 60% gives the highest inside pressure magnitude at maximum number of pressure frequency at any of set evaporator temperature and the lowest heat flow resistance is achieved at 60% filling ratio.

关键词： oscillating heat pipe pressure fluctuation heat flow resistance filling ratio

Fabrication of La,Ce co-doped ZnO nanorods for improving photodegradation of methylene blue

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journal of Rare Earths 2024年第1期42卷 76-83,I0003页

作者： Erfan Hakim Azmal Zaid jin-chung Sin Sze-Mun Lam Abdul Rahman Mohamed School of Chemical Engineering Universiti Sains Malaysia(USM)14300Nibong TebalPenangMalaysia College of Environmental Science and Engineering Guilin University of TechnologyGuilin541004China Guangxi key Laboratory of Theory and Technology for Environmental Pollution Control Guilin University of TechnologyGuilin541004China Collaborative Innovation Center for Water Pollution Control and Water Safety in karst Area Guilin University of TechnologyGuilin541004China Faculty of Engineering and Green Technology Universiti Tunku Abdul RahmanJalan UniversitiBandar Barat31900KamparPerakMalaysia

La,Ce co-doped ZnO nanorods(ZnLC)were synthesized through a one-step solvothermal *** photocatalysts were characterized by X-ray diffraction,Raman spectroscopy,field-emission scanning electron microscopy,energy dispersive X-ray,transmission electron microscopy,UV-vis diffuse reflectance spectroscopy and photo luminescence *** La and Ce doping enhanced the visible light absorption ability of ZnLC and a red shift was detected for *** simulated solar light irradiation,the ZnO doped with 3 at%La and 1 at%Ce(ZnLC1)degrades methylene blue(MB)more effectively than those of pure ZnO,La-doped ZnO(ZnL)and commercially available *** improved photocatalytic performance of ZnLC1 can be attributed to the high charge separation efficiency as demonstrated by the photoluminescence ***,the photocatalytic experiments reveal that several parameters have their own impact on the MB *** a variety of radical scavengers,it is discovered that superoxide anion radical plays a crucial role in the degradation of *** ZnLC1 is also reused several times without noticeable decrease of photoactivity,indicating that it has a substantial potential for environmental remediation applications.

关键词： ZnO Lanthanum Cerium Co-doping Photodegradation Rare earths

Combined Insights from Leachate Structure and Microstructure Characteristics for Eating Quality of Convenience Rice Processed by Super-Heated and Pressurized Steam Technologies

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Rice science 2024年第4期31卷 475-488,I0035,I0036页

作者： Mingyo HA Hyo-Young jEONG ju Hun LEE Hyun-jung chung Division of Food and Nutrition Chonnam National UniversityGwangju 61186South Korea Department of Biotechnology College of Life Sciences and BiotechnologyKorea UniversitySeoul 02841South Korea Division of Food Science&Culinary Arts Shinhan UniversityGyeonggi 11644South Korea

Convenience rice has become widely popular due to its easy availability for cooking. This study investigated the starch structure and composition of leachate and the microstructure of reheated convenience rice using novel processing technologies: super-heated steaming(SHS), auto-electric cooking(AEC), and pressurized-steam cooking(PSC). Additionally, the effect of two different target water contents(58% and 63%) was also evaluated. The PSC_63% sample had the highest total solids and amylopectin amount in the leachate. The amylopectin amount in the leachate differed significantly based on the targeted water content. Morphological characterization revealed that the swelling of starch and the coated layer on the surface of rice grains were most pronounced in the PSC_63% sample due to the pressure processing. The textural hardness of the AEC_58% sample was much higher than that of the other samples. The PSC_63% sample had the highest textural adhesiveness value, which can be attributed to the highest amylopectin amount in the leachate. Sensory characterization showed that the PSC_63% sample had the highest glossiness, whiteness, moistness, and overall acceptability. The principal component analysis score plots presented substantial differences in the leachate and textural and sensory characteristics of reheated convenience rice among the different processing technologies.

关键词： reheated convenience rice starch structure leachate multi-scale structure eating quality processing technology

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S/SP非接触谐振变换器的时域特性分析

中国电机工程学报 2015年第8期35卷 1983-1992页

作者：侯佳陈乾宏任小永阮新波 Siu-chung Wong Chi k.Tse 江苏省新能源发电与电能变换重点实验室(南京航空航天大学自动化学院) 江苏省南京市210016 香港理工大学电子及资讯工程系

S/SP非接触谐振变换器因为对系统参数变化尤其是变压器的耦合系数变化不太敏感,具有良好的应用前景。但该变换器中主要波形谐波含量较大,导致基波分析方法误差较大,直接影响到变换器的参数设计以及控制的有效性。为此论文对变换器的时... 详细信息

S/SP非接触谐振变换器因为对系统参数变化尤其是变压器的耦合系数变化不太敏感,具有良好的应用前景。但该变换器中主要波形谐波含量较大,导致基波分析方法误差较大,直接影响到变换器的参数设计以及控制的有效性。为此论文对变换器的时域特性展开研究。论文考虑谐波影响,推导谐振网络的通用等效电路,揭示谐波产生的原因,建立谐振腔各波形的定量表达式。在时域波形分析的基础上,论文进一步研究变换器的输出增益特性,推导精确的电压增益并指出基波分析方法结果偏大的原因。最后,设计一台1.5 k W的S/SP非接触谐振变换器,特征波形、电压增益的实验与分析结果吻合良好,验证了论文所采用的时域特性分析方法的正确性。

关键词：非接触电能传输时域特性分析输出电压增益串/串并(S/SP)补偿谐振变换器