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2012 IEEE Symposium on Humanities, Science and Engineering Research最新文献

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Switching technique for multiphase voltage source inverter 多相电压源逆变器的开关技术
Pub Date : 2012-06-24 DOI: 10.1109/SHUSER.2012.6268893
W. Munim, Mohamad Fahmi Hussin, Ismail Musirin
This paper presents switching technique for multiphase inverter. The development of two-level five-phase voltage source inverter (VSI) has been thoroughly reviewed and results of this investigation are presented. The combination of large and medium vectors has been examined theoretically while simulations were conducted for verification. The analysis of a five-phase space vector modulation was verified using the Matlab simulation. The simulations were carried out to identify the effectiveness of the combination of large and medium vectors. It was found that the combination of large and medium vectors has significantly reduced the harmonic distortion and therefore, can effectively eliminate the third harmonics which consequently produce a balanced sinusoidal signal.
介绍了多相逆变器的开关技术。对二电平五相电压源逆变器的发展进行了全面的回顾,并给出了研究结果。对大中型矢量组合进行了理论研究,并进行了仿真验证。利用Matlab仿真验证了五相空间矢量调制的分析结果。通过仿真验证了大中型矢量组合的有效性。研究发现,大矢量和中矢量的组合大大降低了谐波失真,因此可以有效地消除三次谐波,从而产生平衡的正弦信号。
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引用次数: 4
Adsorption of reactive dye Remazol Brilliant Blue R from aqueous solutions by rambutan peel 红毛丹皮对活性染料雷马唑亮蓝R的吸附研究
Pub Date : 2012-06-24 DOI: 10.1109/SHUSER.2012.6268855
R. Alrozi, N. Zamanhuri, M. Osman
Adsorption of Remazol Brilliant Blue R (RBBR) by rambutan peel (RP) was examined. The adsorption experiments were carried out under different conditions of initial concentration (25-500 mg/L), solution pH 2-12 and RP dose (0.05-1.2 g). The influence of these parameters on the adsorption capacity was studied using the batch process. RBBR adsorption uptake was found to increase with increase in initial concentration and contact time. The RBBR adsorption was favourable at pH<;4. Langmuir, Freundlich and Temkin isotherm models were used to illustrate the experimental isotherms and isotherms constant. The equilibrium data were best represented by Langmuir isotherm model, showing maximum monolayer adsorption capacity of 112.69 mg/g. The rates of adsorption were found to obey the rules of pseudo-second order model with good correlation. The results suggested that RP has high potential to be used as effective adsorbent for RBBR removal.
研究了红毛丹皮(RP)对雷马唑亮蓝R (RBBR)的吸附作用。在初始浓度(25 ~ 500 mg/L)、溶液pH 2 ~ 12、RP用量(0.05 ~ 1.2 g)等条件下进行吸附实验,采用间歇式工艺研究了这些参数对吸附量的影响。RBBR吸附吸收率随初始浓度和接触时间的增加而增加。pH< 4时,RBBR吸附效果较好。采用Langmuir、Freundlich和Temkin等温线模型说明实验等温线和等温线常数。Langmuir等温线模型最能代表平衡数据,其最大单层吸附容量为112.69 mg/g。结果表明,吸附速率符合准二阶模型规律,具有良好的相关性。结果表明,RP作为RBBR的有效吸附剂具有很高的应用潜力。
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引用次数: 7
Effect of various annealing temperature on the morphological and dielectric properties of Polyvinylidenefluoride-Trifluoroethylene thin film 不同退火温度对聚偏氟乙烯-三氟乙烯薄膜形态和介电性能的影响
Pub Date : 2012-06-24 DOI: 10.1109/SHUSER.2012.6268990
M. Rozana, M. Wahid, A. Arshad, M. N. Sarip, Z. Habibah, L. N. Ismail, M. Rusop, Wan Haliza Abd Majid, W. C. Gan
The morphology of PVDF-TrFE (70/30) thin film at various annealing temperature were investigated using non-contact mode Atomic Force Microscopy (AFM). Differential Scanning Calorimetry (DSC) technique was used to obtain TC, Tm, and TCrys of PVDF-TrFE. The prepared spin coated PVDF-TrFE (70/30) thin films were annealed at TC (113°C), Tm (154°C), TCrys (135°C) and Tc at cooling (55°C) in accordance to the DSC thermogram observed. Impedance Spectroscopy were conducted to study the dielectric characteristic of the thin films in order to substantiate the electrical behavior of the thin films From the results obtained, the thin films exhibited different morphologies depending on the annealing temperatures utilized. Formation of needle-like crsytallite structure was observed film annealed at and over Tm. Thin film re-crystallized at TC has an optimized dielectric constant of ~7.8 at 104 hz.
采用非接触原子力显微镜(AFM)研究了不同退火温度下PVDF-TrFE(70/30)薄膜的形貌。采用差示扫描量热法(DSC)测定了PVDF-TrFE的TC、Tm和TCrys。根据观察到的DSC热像图,对制备的自旋涂覆PVDF-TrFE(70/30)薄膜在TC(113℃)、Tm(154℃)、TCrys(135℃)和TC(55℃)下进行退火。利用阻抗谱法研究了薄膜的介电特性,从而证实了薄膜的电学行为。结果表明,薄膜在不同的退火温度下呈现出不同的形貌。在Tm和Tm以上退火后,观察到针状晶体结构的形成。在TC下再结晶的薄膜在104 hz时的最佳介电常数为~7.8。
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引用次数: 6
Adsorption of arsenic (V) and phosphate onto MgAlNO3-LDHs MgAlNO3-LDHs吸附砷(V)和磷酸盐的研究
Pub Date : 2012-06-24 DOI: 10.1109/SHUSER.2012.6268866
N. I. Taib, N. Kantasamy, S. Sumari, N. M. Rafi
LDH with nitrate in the interlayer and Mg-Al (3:1) in the layer have been synthesized by co-precipitation method. The adsorption of arsenic and phosphate onto MgAlNO3 hydrotalcite was evaluated with respect to pH, contact time, initial concentration and adsorbent dosage. The kinetic data were fitted into the pseudo-first-order equation, and the pseudo-second-order equations, and the intra-particle diffusion model. The results indicate that the pseudo-second-order model generates the best agreement with the experimental data for both arsenic and phosphate suggesting that the adsorption process might involve chemical sorption.
采用共沉淀法合成了层间含有硝酸盐、层内含有镁铝(3:1)的LDH。考察了MgAlNO3水滑石在pH、接触时间、初始浓度和吸附剂用量等条件下对砷和磷酸盐的吸附性能。将动力学数据拟合为拟一阶方程、拟二阶方程和粒子内扩散模型。结果表明,拟二阶模型对砷和磷酸盐的吸附与实验数据吻合最好,表明吸附过程可能涉及化学吸附。
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引用次数: 4
Motion detection and base isolation system for earthquake-resistant relief structures: Application of biomimetics 抗震救灾结构的运动检测和基础隔离系统:仿生学的应用
Pub Date : 2012-06-24 DOI: 10.1109/SHUSER.2012.6268899
M. F. Khamidi, S. A. Farhan, K. Chai, A. Idrus, M. Nuruddin
The conceptual design of a motion detection and base isolation system for earthquake-resistant relief structures is presented. The design process, which applies principles of biomimetics, is inspired by the motion detection ability of birds and fishes and shock isolation ability of woodpeckers' skulls. Concrete blocks with and without base isolators were subjected to shake table tests to evaluate the efficiency of the base isolation system. Results revealed that the base isolation system reduces horizontal acceleration of concrete blocks by approximately 82.00 ± 2.0%.
提出了一种抗震救灾结构运动检测与基础隔震系统的概念设计。设计过程运用仿生学原理,灵感来自鸟类和鱼类的运动检测能力和啄木鸟头骨的隔震能力。对混凝土砌块进行了振动台试验,以评价基础隔震系统的效率。结果表明,基础隔震系统使混凝土砌块的水平加速度降低约82.00±2.0%。
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引用次数: 0
Ontology understanding in enhancing car styling ideation 本体理解在提高汽车造型创意中的作用
Pub Date : 2012-06-24 DOI: 10.1109/SHUSER.2012.6268856
W. Z. Yusof, M. S. Mujir, S. S. Isa, A. Ali
In the search for helpful styling cognition for car in the conceptual phase of design, the approach was taken experimentally study car ontology understanding in relation to quality of idea in sketching. The links between these subsets will be able to map the aesthetic intent through shape characteristics and idea. Understanding of ontology is important before a semantic approach could be applied as study shows that students who have knowledge of car ontology can produce better idea-sketching of car styling compared to students who have no knowledge of car ontology.
为了寻求对汽车设计概念阶段有帮助的造型认知,采用实验方法研究了汽车本体理解与草图构思质量的关系。这些子集之间的联系将能够通过形状特征和想法映射美学意图。在应用语义方法之前,对本体的理解是很重要的,因为研究表明,有汽车本体知识的学生比没有汽车本体知识的学生能更好地绘制汽车造型的想法草图。
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引用次数: 2
Moisture effects on the ABS used for Fused Deposition Modeling rapid prototyping machine 水分对熔融沉积成型快速成型机用ABS的影响
Pub Date : 2012-06-24 DOI: 10.1109/SHUSER.2012.6268999
S. N. A. M. Halidi, J. Abdullah
User experience and many machine breakdown records of FDM rapid prototyping indicated that moisture effects on Acrylonitrile Butadiene Styrene (ABS) which consequently causes physical, morphological and thermal stability changes to the polymer, is the major cause of problem. These reports claim that these changes may have caused nozzle blockage on the liquefier of the Fused Deposition Modeling (FDM) machine although no thorough investigation were done. Experiments are therefore conducted to verify these assumptions. It has been observed that physical changes do not cause nozzle clogging. The clogging is due to the morphological and thermal stability changes of ABS when the material is exposed to moisture.
FDM快速成型的用户体验和许多机器故障记录表明,水分对丙烯腈-丁二烯-苯乙烯(ABS)的影响导致聚合物的物理、形态和热稳定性发生变化,这是问题的主要原因。这些报告声称,尽管没有进行彻底的调查,但这些变化可能导致熔融沉积成型(FDM)机液化器的喷嘴堵塞。因此,进行实验来验证这些假设。据观察,物理变化不会引起喷嘴堵塞。堵塞是由于ABS的形态和热稳定性的变化,当材料暴露于水分。
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引用次数: 35
Effect of deposition temperature to electrical, structural and optical properties of amorphous carbon thin film prepared by TCVD 沉积温度对TCVD法制备非晶碳薄膜电学、结构和光学性能的影响
Pub Date : 2012-06-24 DOI: 10.1109/SHUSER.2012.6268906
F. Mohamad, U. Noor, M. Rusop
Amorphous carbon (a-C) thin films have been prepared by thermal chemical vapor deposition (TCVD) technique at different temperature. The preparation involved argon (Ar), and camphor as carrier gas and carbon source respectively. The effects of deposition temperature in the a-C thin film on electrical, structural and optical properties was characterized by using Advantest R6243 DC Voltage Current Source/Monitor and SemiPro Curve Software, Scanning Electron Microscopy (SEM) and UV-VIS-NIR spectroscopy. The current-voltage (I-V) measurement studies demonstrate that the conductivity increased along the deposition temperature. There are also significant changes in structural and optical band gap as deposition temperature varies.
采用热化学气相沉积(TCVD)技术在不同温度下制备了非晶碳(a-C)薄膜。该工艺以氩气和樟脑为载气和碳源。利用Advantest R6243直流电压电流源/监视器和SemiPro曲线软件、扫描电镜(SEM)和紫外-可见-近红外光谱(UV-VIS-NIR)分析了沉积温度对a-C薄膜电学、结构和光学性能的影响。电流-电压(I-V)测量研究表明,电导率随沉积温度的增加而增加。随着沉积温度的变化,结构和光带隙也发生了显著的变化。
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引用次数: 0
Structure transformation of ZnO thin films properties influenced by substrate temperature deposited by magnetron sputtering 磁控溅射沉积ZnO薄膜的结构转变及性能
Pub Date : 2012-06-24 DOI: 10.1109/SHUSER.2012.6269002
N. Sin, S. Ahmad, M. Musa, M. H. Mamat, M. Rusop
The structure transformation of ZnO thin films properties influenced by substrate temperature deposited by RF Magnetron Sputtering is presented. This project has been focused on electrical, optical and structural properties of ZnO thin films. The effect of variation substrate temperature at 200°C~500°C on the ZnO thin films have been investigated. The thin films were examined using two point probe current-voltage (I-V) measurement (Keithley 2400), UV-Vis-NIR spectrophotometer, field emmision scanning electron microscopy (FESEM) (JEOL JSM 7600F) and atomic force microscope (AFM) (Park System XE-100). ZnO thin films were prepared at 200 watt by a RF magnetron sputtering using ZnO target using glass as the substrate. The IV measurement indicated as the substrate temperature increase, the conductivity of ZnO thin film increase. All films have show high UV absorption properties using UV-VIS spectrophotometer (JASCO 670). The root means square (rms) roughness for ZnO thin film were about (<;8nm) was measured using AFM. The image form FESEM observed that transformation of structure started to change at high temperature (400~500°C).
研究了射频磁控溅射法制备ZnO薄膜的结构变化及其性能。本项目主要研究ZnO薄膜的电学、光学和结构特性。研究了衬底温度在200℃~500℃范围内变化对ZnO薄膜的影响。采用两点探针电流-电压(I-V)测量仪(Keithley 2400)、紫外-可见-近红外分光光度计、场发射扫描电镜(FESEM) (JEOL JSM 7600F)和原子力显微镜(AFM) (Park System xie -100)对薄膜进行检测。以ZnO为靶材,以玻璃为衬底,采用射频磁控溅射法制备了200瓦的ZnO薄膜。IV测量结果表明,随着衬底温度的升高,ZnO薄膜的电导率增大。用紫外可见分光光度计(JASCO 670)测定,所有薄膜均具有较高的紫外吸收性能。采用原子力显微镜测量ZnO薄膜的均方根粗糙度(rms)约为(< 8nm)。FESEM图像观察到,在高温(400~500℃)下,结构转变开始发生变化。
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引用次数: 7
The analysis of KMV-Merton model in forecasting default probability KMV-Merton模型预测违约概率的分析
Pub Date : 2012-06-24 DOI: 10.1109/SHUSER.2012.6269010
N. M. Yusof, M. Jaffar
The paper gives brief review on two models called as Merton model and KMV-Merton model. Merton model is known as the triggers to the development of many credit risk models. Of all the credit risk models developed, the KMV-Merton model is the most popular. KMV-Merton model is developed to provide probabilistic assessment of firm's likelihood to default. Its ability in forecasting default for firms is proven when most of studies done by researchers and practitioners portray positive results. However in certain circumstances, the model becomes unavailable due to its structural constraints. Therefore, analysis is done on the KMV-Merton model so that modified default probability formulae are obtained for certain circumstances where the model becomes unavailable. Analysis is done using the mathematical approach. Then, the paper did data testing observation to justify the analysis. It is found that the results from the data testing satisfied the analysis done on KMV-Merton model. Thus, it verified that the modified default probability is true. The main contribution of this paper is it able to fill the gap exists in the KMV-Merton model in forecasting default for firms.
本文简要介绍了默顿模型和km -默顿模型。默顿模型被认为是许多信用风险模型发展的导火索。在所有已开发的信用风险模型中,km - merton模型是最受欢迎的。利用KMV-Merton模型对企业的违约可能性进行了概率评估。当研究人员和从业人员所做的大多数研究都描绘了积极的结果时,它在预测公司违约方面的能力得到了证明。然而,在某些情况下,由于其结构限制,模型变得不可用。因此,对KMV-Merton模型进行分析,得到了在模型不可用的特定情况下修改后的违约概率公式。用数学方法进行分析。然后进行数据检验观察,验证分析的正确性。数据测试结果与km - merton模型的分析结果基本一致。从而验证修改后的违约概率为真。本文的主要贡献在于能够填补km - merton模型在预测企业违约方面的空白。
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引用次数: 2
期刊
2012 IEEE Symposium on Humanities, Science and Engineering Research
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