检索结果-内蒙古大学图书馆

Surface Water Wave Topography Construction using Free Surface Synthetic Schlieren Method for Demonstration of Ripple Tank Wave Phenomena

引用

Journal of Physics: Conference Series 2018年第1期1144卷

作者： S Yapo E Seesomboon N Chattrapiban N Pussadee Master's Degree Program in Teaching Physics Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Department of Mechanical Engineering Faculty of Engineering Chiang Mai University Chiang Mai 50200 Thailand Department of Physics and Materials Science Chiang Mai University Chiang Mai 50200 Thailand Thailand Center of Excellence in Physics Commission on Higher Education 328 Si Ayutthaya Road Bangkok 10400 Thailand Research Center in Physics and Astronomy Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand

The ripple tank is a popular water wave phenomena demonstration tool for secondary school students. The projected wave images are observed in bright - dark patterns on a screen. This tool, however, falls short in presenting the amplitude of the waves which is another important parameter in explaining the wave phenomena. The free surface synthetic schlieren (FS-SS) method presents an immense technical tool for solving this problem. FS-SS is an optical method based on light refraction in determining the surface gradient field from the motion of a random dot pattern when the water surface is perturbed. The surface height of the wave is constructed using the inverse gradient operation on the displacement gradient field of the random dot pattern. In this work, Wave propagation, reflection, diffraction, and interference pattern surface construction were performed to visualize wave phenomena in 3D.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Phase identification and morphology study of hematite (Fe2O3) with sintering time varitions

引用

AIP Conference Proceedings 2017年第1期1887卷

作者： Cepi Yazirin Poppy Puspitasari Muhammad Ilman Nur Sasongko Dewi Izzatus Tsamroh Puput Risdanareni 3Master Program Postgraduate Program in Mechanical Engineering State University of Malang East Java Indonesia 1Mechanical Engineering Department Engineering Faculty State University of Malang Malang East Java Indonesia 2Center of Advanced Materials State University of Malang East Java Indonesia 4Civil Engineering Department Engineering Faculty State University of Malang East Java Indonesia

Iron oxide has been the interest of many studies due to its applications in various scientific and industrial fields including in environment, corrosion, soil science, and exhaust emissions. Iron oxide (Fe2O3) has potential applications in catalytic reactions in electronic devices such as semiconductors, paint formulations, and lithium rechargeable batteries. Fe2O3 can be synthesized through the process of stirring, decomposition of organic iron, sol-gel, combustion, and evaporating solvents. Most of the methods used involve several steps and take a long time. The aim of this research was to investigate the phase and morphology characterization of iron oxide (Fe2O3) powder with solvent ethylene glycol after being sintered for 1 hour, 2 hours and 3 hours. The characterization tools utilized were XRD, SEM-EDX, and FTIR. The results of XRD analysis showed that the Fe2O3 sintered for 1 hour had the smallest crystallite size with a diameter of 21.05 nm. In the XRD test, the beam of X-ray was shot directly at the grain being tested. The results of SEM analysis showed thatthe Fe2O3 sintered for 1 hour produced the best result due to its crystallite size of 12.36 nm and hada shape of homogeneous nanosphere; the duration of sintering indeed had a great influence on the grain size of iron oxide (Fe2O3). In addition, the results of the elemental composition analysis indicate that the longer the sintering process, the higher the concentration of O but the lower the Fe.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Study on characteristics of surface modification of RDX by coating with stearic acid or calcium stearate

Chung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute ...

引用

Chung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute of Technology 2016年第2期45卷 75-85页

作者： Kuo, Song-Cheng Lu, Kai-Tai Li, Jin-Shuh Yeh, Tsao-Fa Master Program of Chemical Engineering Chung Cheng Institute of Technology National Defense University Taiwan Department of Chemical and Materials Engineering Chung Cheng Institute of Technology National Defense University Taiwan

In this study, an effective surface modification method was developed to reduce the mechanical sensitivity of RDX (Cycotrimethylenetrinitramine). Firstly, stearic acid or calcium stearate was coated on the surface of RDX particles by the chemical precipitation method. Afterward scanning electron microscope (SEM) and energy dispersive X-ray spectrum analyzer (EDS) were used to observe and verify the coating results. Differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) were also used to measure and compare the thermochemical properties of RDX particles before and after coating. Finally, drop hammer impact test and friction sensitivity test were executed to measure mechanical sensitivity for analyzing the effect of surface modification of RDX particles on the sensitivity. The experimental results showed that the mechanical sensitivity of coated RDX particles, especially coated by calcium stearate, was lower than that of raw RDX particles. The research results could be used to develop the manufacturing process of insensitive explosive for military arsenal.

关键词： Coatings

来源：评论

学校读者我要写书评

暂无评论

The research-based learning development model as a foundation in generating research ideas

引用

AIP Conference Proceedings 2017年第1期1887卷

作者： Poppy Puspitasari Johan Wayan Dika Avita Ayu Permanasari 1Mechanical Engineering Department Engineering Faculty Universitas Negeri Malang Semarang St. No. 5 Malang East Java Indonesia 2Center of Advanced Materials Universitas Negeri Malang Semarang St. No. 5 Malang East Java Indonesia 3Master’s Program Vocational Education Department Postgraduate Program Universitas Negeri Malang Semarang St. No. 5 Malang East Java Indonesia

Research Based Learning is learning that requires students to have exploration skills related to their field. By doing so, students are encouraged to create skills in managing the higherorder of abstraction in order to resolve any problems encountered. The study was done to make the schemes and sequences of learning needed by the students in order to help them to explore first ideas for their upcoming thesis. The scheme development resulted in five stages consisting of 1) identifying research journals; 2) track the development of research topics; 3) reviewing research journals; 4) discussing the results of the reviews; and 5) formulating the research topic. Furthermore, the application of 5 the stage receives percentage agreement of students was 85.9%. Therefore, it can be noted that the application of the scheme is definitely a help for students to find research ideas.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The Impact of Clay Loading on the Relative Intercalation of Poly(Vinyl Alcohol)-Clay Composites

引用

Journal of materials Science and Chemical engineering（材料科学与化学工程） 2016年第10期

作者： Moustafa M. Zagho Mahmoud M. Khader Center for Advanced Materials Qatar University Materials Science and Technology Master Program College of Arts and Science Qatar University Gas Processing Center College of Engineering Qatar University

来源：评论

学校读者我要写书评

暂无评论

Titanium oxynitride thin films as high-capacity and high-rate anode materials for lithium-ion batteries

Titanium oxynitride thin films as high-capacity and high-rat...

引用

作者： Chiu, Kuo-Feng Su, Shih-Hsuan Leu, Hoang-Jyh Hsia, Chen-Hsien Department of Materials Science and Engineering Feng Chia University 100 Wenhwa Rd. Taichung40724 Taiwan Master's Program of Green Energy Science and Technology Feng Chia University 100 Wenhwa Rd. Taichung40724 Taiwan

Titanium oxynitride (TiOxNy) was synthesized by reactive magnetron sputtering in a mixed N2/O2/Ar gas at ambient temperature. TiOxNy thin films with various amounts of nitrogen contents were deposited by varying the N2/O2 ratios in the background gas. The synthesized TiOxNy films with different compositions (TiO1.837N0.060, TiO1.890N0.068, TiO1.865N0.073, and TiO1.882N0.163) all displayed anatase phase, except TiO1.882N0.163. The impedances and grain sizes showed obvious variations with the nitrogen contents. A wide potential window from 3.0 V to 0.05 V, high-rate charge-discharge testing, and long cycle testing were applied to investigate the performances of synthesized TiOxNy and pure TiO2 as anodes for lithium-ion batteries. These TiOxNy anodes can be cycled under high rates of 125 μA/cm2 (10 °C) because of the lower charge-transfer resistance compared with the TiO2 anode. At 10 °C the discharge capacity of the optimal TiOxNy composition is 1.5 times higher than that of pure TiO2. An unexpectedly large reversible capacity of ~ 300 μAh/cm2 μm (~ 800 mAh/g) between 1.0 V and 0.05 V was recorded for the TiOxNy anodes. The TiOxNy anode was cycled (3.0 V to 0.05 V) at 10 °C over 300 times without capacity fading while delivering a capacity of ~ 150 μAh/cm2 μm (~ 400 mAh/g). © 2015 Elsevier B.V. All rights reserved.

关键词： Thin films

来源：评论

学校读者我要写书评

暂无评论

Impact of Stacking Model and Blast Resistance Wall on the Magazine Explosion

Chung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute ...

引用

Chung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute of Technology 2015年第2期44卷 73-83页

作者： Li, Chia-Chun Lu, Kai-Tai Yang, Tsung-Mao Yeh, Tsao-Fa Master Program of Chemical Engineering Chung Cheng Institute of Technology National Defense University Taiwan Department of Chemical and Materials Engineering Chung Cheng Institute of Technology National Defense University Taiwan

The purpose of this research is to explore the technology of reducing safety quantity-distance for the magazine. Firstly, the stacking models of ammunitions are evaluated and built according to the existing ammunition storage capacity and the storehouse forms. Afterward the reduced scale explosion experiments are carried out, and the experimental data are used to compare with the reduced scale simulation results of LS-DYNA finite element analysis software. The fine tuning parameters of numerical analysis are obtained for LS-DYNA finite element analysis. Finally, the LS-DYNA finite element analysis software is used to actually simulate and analyze the difference of explosion shock wave propagation on the condition of various stacking model of ammunition storage. The influence of various stacking model on reducing the required safety distance is also analyzed. Furthermore, the position and shape of blast resistance wall are set as the parameters of simulation calculation. The LS-DYNA finite element analysis software is also used to explore the influence of blast resistance wall on reducing the required safety distance. The research results will contribute to review and improve the existing storage and management system of ammunitions for military, and increase the efficiency and safety of the ammunition storage.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Study on the Increase of Comfort in Ten Fashion Summer Tops Made of Four Kinds of Textiles

引用

Research Journal of Textile and Apparel 2014年第2期18卷 56-64页

作者： Chang, Yi-Ching Lee, Kuei-Chi Miao, Mei-Fen Yu, Huei-Jen Department of Fashion Design Shih Chien University Taiwan Department of Textile Engineering Chinese Culture University Taiwan Department of Textile Engineering Chinese Culture University China Department of Chemical and Materials Engineering and Master Program of Nanomaterials Chinese Culture University China

In response to the increasing demands for energy saving and carbon reduction under current global trends, we apply 10 fashion summer tops from Paris and New York made of cotton and CVC fabrics, fabric that has moisture transferring and sweat expulsion abilities, and fabric with moisture transferring and sweat expulsion properties that also imparts a cooling sensation in this study. Furthermore, by analyzing the activity of sympathetic and parasympathetic nerves which are measured by a heartbeat variability analyzer, we have obtained the relative comfort results in both the dynamic and static modes while the tested subject is wearing garments made from the 4 types of fabrics. We have tried to bring out the relationship between summer fashion style, fabric type and comfort. The test results indicate that the fabric with moisture transferring and sweat expulsion abilities can greatly increase the comfort of the garment and the comfort will be further increased if the fabric adds nano mineral-powder that imparts a cooling sensation for further moisture transferring and sweat expulsion. Finally, less coverage and stress on the top part (neck, shoulders and upper back) of the human body can reduce induced pressure and increase the relative comfort. © 2014 Emerald Group Publishing Limited.

关键词： Comfort Cooling Sensation Moisture Transfer Sympathetic Nerves

来源：评论

学校读者我要写书评

暂无评论

Study on the preparation of recrystallization and the analysis of explosion sensitivity for spherical RDX particles

Chung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute ...

引用

Chung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute of Technology 2014年第2期43卷 187-198页

作者： Hsu, Mi-Ch Lu, Kai-Tai Li, Jin-Shuh Yeh, Tsao-Fa Master Program of Chemical Engineering Chung Cheng Institute of Technology NDU Taiwan Department of Chemical and Materials Engineering Chung Cheng Institute of Technology NDU Taiwan

This study uses the Soxhlet extraction method to prepare the recrystallized RDX (Cycotrimethylenetrinitramine) particles under various operating condition, and then the scanning electron microscope (SEM) and the particle size distribution analyzer (PSDA) were used to observe the morphology of particles and measure the size of particles. The experimental results can be used to evaluate the optimum operating condition for preparing spherical RDX particles. Afterward the thermo-stability of spherical RDX particles is analyzed by means of differential scanning calorimeter (DSC) and thermo gravimetric analyzer (TGA) and the mechanical sensitivity is measured by means of the drop hammer impact tester and friction apparatus. The experimental results show that the impact sensitivity of recrystallized spherical RDX particles is more insensitive than one of raw RDX particles, but the friction sensitivity of recrystallized spherical RDX particles is more sensitive. The research results will contribute to improve the manufacturing process of RDX particles for military arsenal.

关键词： Recrystallization (metallurgy)

来源：评论

学校读者我要写书评

暂无评论

Superhydrophilic self-cleaning surfaces based on TiO₂ and TiO₂/SiO₂ composite films for photovoltaic module cover glass

引用

Applied Adhesion Science 2015年第1期3卷 1-9页

作者： Jesus, Magnum Augusto Moraes Lopes de Neto, João Trajano da Silva Timò, Gianluca Paiva, Paulo Renato Perdigão Dantas, Maria Sylvia S Ferreira, Angela de Mello Master Program in Materials Engineering Centro Federal de Educação Tecnológica de Minas Gerais – campus I Av. Amazonas 5253 Nova Suiça 30421-169 Belo Horizonte MG Brazil Ricerca Sul Sistema Energetico - RSE S.p.A Le Mose Piacenza 29100 Italy National Institute of Science and Technology on Mineral Resources Water and Biodiversity (INCT-Acqua) - Av. Antônio Carlos 627 Pampulha 31270-901 Belo Horizonte MG Brazil Chemistry Department Centro Federal de Educação Tecnológica de Minas Gerais – campus I Av. Amazonas 5253 Nova Suiça 30421-169 Belo Horizonte MG Brazil

Self-cleaning surfaces have excelled in recent years in energy and environmental fields. In particular, in solar energy area, these surfaces are used to avoid soiling accumulation on photovoltaic (PV) modules. So far TiO₂ has been widely used due to its photocatalytic activity and photo-induced superhydrophilicity. However, this oxide has some limitations since it reduces the glass transmittance and it rapidly reestablish the water contact angle in dark environments. In order to circumvent these limitations, composites TiO₂/SiO₂ have been proposed. For photovoltaic application, besides a good transparency in the wavelength region 300–1800 nm and self-cleaning properties, the coating should also present long durability and adequate adhesion to endure the outdoor conditions. Aiming at developing a coating with these properties, in this work, TiO₂/SiO₂ composites containing different titanium content have been synthesized and compared with pure TiO₂ films in relation to adhesion, transparency and hydrophilicity. Both films have been deposited over low iron float glass substrates by sol–gel dip-coating technique and different calcination temperatures (400, 500, 600°C) and Si/Ti molar rates (Si₈₆Ti₁₄, Si₄₀Ti₆₀) have been considered. TiO₂/SiO₂ films showed higher transmittance in visible range compared with pure TiO₂. TiO₂/SiO₂ films showed superhydrophilic character before and after ultraviolet irradiation, with water contact angles near to 0°. Furthermore, as predicted, TiO₂/SiO₂ films could keep the superhydrophilic character in dark environments, in contrast with pure TiO₂ films. Both TiO₂ and TiO₂/SiO₂ films exhibited good adherence and it is shown that higher calcination temperatures and higher titanium content enhance such property. All f

关键词： Self-cleaning surfaces Sol–gel Superhydrophilicity Thin film TiO2 TiO2/SiO2 composite

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：