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2011 National Postgraduate Conference最新文献

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Investigation on the effect of crude palm oil (CPO) on the cutting forces, surface roughness and tool wear in turning SS304 粗棕榈油(CPO)对车削SS304切削力、表面粗糙度和刀具磨损影响的研究
Pub Date : 2011-09-01 DOI: 10.1109/NATPC.2011.6136542
N. Ibrahim, M. Sudin, M. Nor
Knowledge of the performance of cutting fluids in machining process is important in order to improve the efficiency of any machining process. The objective of this work is to compare the performance of CPO to commercially available cutting fluid which is Solkut 2140 cutting fluid in terms of cutting forces, surface roughness of the workpiece and tool wear in turning process by using coated carbide insert as cutting tool and AISI 304 austenitic stainless steel as workpiece material. In general, the results indicated that CPO performed better than Solkut 2140 in reducing the cutting forces, improving the surface finish and reducing the tool wear. CPO has been used as a cutting fluid in this work because it provides the desirable quality for boundary lubrication, biodegradable, less toxic and vast resources.
为了提高任何加工过程的效率,了解切削液在加工过程中的性能是很重要的。以涂覆硬质合金刀片为刀具,AISI 304奥氏体不锈钢为工件材料,比较CPO与市售切削液Solkut 2140切削液在切削力、工件表面粗糙度和车削过程中刀具磨损方面的性能。总体而言,CPO在减小切削力、提高表面光洁度和减少刀具磨损方面优于Solkut 2140。由于CPO具有良好的边界润滑性能、可生物降解、毒性小、资源量大等优点,因此被用作切削液。
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引用次数: 4
Study on wax deposition in crude oils 原油中蜡沉积的研究
Pub Date : 2011-09-01 DOI: 10.1109/NATPC.2011.6136257
M. S. Khan, H. Mukhtar, C. F. Kait
Deposition of complex and heavy organic compounds, which exist in petroleum crude and heavy oil, can cause a number of severe problems. In present study wax deposition was studied at 80°C using cold finger device. Three crude oil samples were tested in original and demetalized composition for wax deposition. FTIR and GC-MS was used for chemical composition and structural analysis of the obtained wax. Significant difference was observed for wax deposition in original and demetalized crude oil samples. The chemical composition analysis of carbon-hydrogen stretching mode showed a strong absorption between 2850 cm•1, 2916 cm•1 and 2950 cm•1. GC-MS analysis confirmed the pattern of n alkanes with presence of other high molecular weight compounds in wax obtained from crude oil samples.
石油原油和重油中存在的复杂和重质有机化合物的沉积会引起许多严重的问题。本研究采用冷指仪对80℃下的蜡沉积进行了研究。对三种原油样品进行了原始成分和脱金属成分的蜡沉积试验。用FTIR和GC-MS对所得蜡进行了化学成分和结构分析。原始原油样品和脱金属原油样品的蜡沉积有显著差异。碳-氢拉伸模式的化学成分分析表明,在2850 cm•1、2916 cm•1和2950 cm•1之间有较强的吸收。气相色谱-质谱分析证实了原油蜡中正构烷烃和其他高分子量化合物的存在。
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引用次数: 1
Study on roof tile's colors in Malaysia for development of new anti-warming roof tiles with higher Solar Reflectance Index (SRI) 为开发更高太阳反射率(SRI)的新型防暖屋面瓦,马来西亚屋面瓦颜色研究
Pub Date : 2011-09-01 DOI: 10.1109/NATPC.2011.6136358
A. M. A. Yacouby, M. Khamidi, M. Nuruddin, S. A. Farhan, A. E. Razali
This paper presents the preliminary findings of on going study intended to develop a cool house by introducing roofing materials with higher Solar Reflectance Index (SRI). SRI is a composed measure that accounts for surface's solar reflectance and emittance. It is measured on a unitless scale from 0 to 1. Residential buildings in Malaysia are experiencing overheating of roof space due to inappropriate selection of roofing systems and materials. This badly affects the indoor thermal comfort of low rise buildings where roof represents 70% of heat gain. Emissions from building sectors are about 8.6Gt of CO2 per year. The thermal performance of a building is affected by the solar absorbance of roof. During a clear sky conditions up to 1kW/m2 of radiation can be incidental on a roof surface and between 20% and 90% of this radiation is typically absorbed. This study emphasizes on observation and documentation of main parameters which influence SRI of roof tiles i.e. (1) Roof color, (2) material composition, and (3) the degree of roof slope. The research methodology consists of (1) construction of one unit experimental house to study the effects of SRI of roof on indoor thermal comfort, and (2) semi-structured questionnaire survey conducted to determine the roof colors on existing buildings in Malaysia. Home buyer's roof color preference was also determined. The research outcomes will have important implication for application of cool roofs and sustainable development in Malaysia.
本文介绍了一项正在进行的研究的初步结果,该研究旨在通过引入具有更高太阳反射率(SRI)的屋顶材料来开发凉爽的房屋。SRI是一种综合测量表面太阳反射率和发射率的方法。它在0到1的无单位刻度上测量。由于屋顶系统和材料的选择不当,马来西亚的住宅建筑正在经历屋顶空间过热。这严重影响了低层建筑的室内热舒适性,因为屋顶占热量增益的70%。建筑行业每年的二氧化碳排放量约为86亿吨。建筑物的热性能受屋顶对太阳的吸收率的影响。在晴朗的天空条件下,屋顶表面可能偶然产生高达1kW/m2的辐射,其中20%至90%的辐射通常被吸收。本研究着重对影响屋面瓦SRI的主要参数(1)屋面颜色,(2)材料成分,(3)屋面坡度进行观察和记录。研究方法包括:(1)建造一个单元实验房屋,研究屋顶的SRI对室内热舒适的影响;(2)进行半结构化问卷调查,确定马来西亚现有建筑的屋顶颜色。购房者的屋顶颜色偏好也被确定。研究成果将对马来西亚冷屋顶的应用和可持续发展具有重要意义。
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引用次数: 17
Synthesizing and characterization of Cu-WC-Si composite prepared by using planetary ball milling 行星球磨Cu-WC-Si复合材料的合成与表征
Pub Date : 2011-09-01 DOI: 10.1109/NATPC.2011.6136411
A. Z. Mahamat, A. Rani, P. Husain
Cu-WC-Si composites were synthesized by using a planetary ball milling. Different composition of elemental Cu, WC and Ti powders were mixed and milled for 5 and 10 hours in an open air. The powder characterized before and after milling to expose the effect of milling variables on particle size, homogenization and contamination. Analyzing carried out by using X-ray and scanning electron microscope (SEM). The as milled particle size and homogenization generally influenced by milling time and tungsten Carbide (WC) content. With longer milling time and higher tungsten carbide content, particle size becomes smaller and smaller. The average particle sizes of the as milled powder are in ranged from 5µm to 30 µm and strongly depend on the copper content.
采用行星球磨法制备了Cu-WC-Si复合材料。将不同组成的单质Cu、WC和Ti粉末混合,在露天条件下进行5和10小时的研磨。对粉磨前后的粉末进行了表征,揭示了粉磨变量对颗粒大小、均匀性和污染的影响。利用x射线和扫描电子显微镜(SEM)进行分析。磨粒粒度和均质性一般受磨粒时间和碳化钨含量的影响。随着磨矿时间的延长和碳化钨含量的增加,颗粒尺寸越来越小。磨粉的平均粒度在5µm到30µm之间,与铜的含量密切相关。
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引用次数: 0
Experimental study of electromagnetic waves affects on enhanced oil recovery 电磁波对提高采收率影响的实验研究
Pub Date : 2011-09-01 DOI: 10.1109/NATPC.2011.6136434
M. Kashif, Nadeem Nasir, M. Akhtar, N. Yahya
The heating of crude oil by using electromagnetic waves can enhanced the recovery of crude oil due to reduction in its viscosity and assisting in its movement. This paper describes effect of electromagnetic waves on oil recovery by using curve twin dipole antenna with four magnetic feeders in the radio frequency region. Two similar core rock samples were use in this study. The porosity and permeability of the core samples were measured by using Poroperm System. Oil saturated core rock samples were kept in tank filled with brine of 10000ppm salinity for efficient oil recovery. These core rock samples were kept at room temperature and 55°C with and without electromagnetic waves. The EM waves emitted by the curve twin antenna with 4 magnetic feeders were able to recover 10.60% of OOIP at room temperature and 29.28% of OOIP at 55°C. Core rock samples without electromagnetic waves give oil recoveries 7.66% of OOIP at room temperature and 23.15% of OOIP at 55°C.
利用电磁波对原油进行加热,可以降低原油的粘度,促进原油的运移,从而提高原油的采收率。本文介绍了在射频区采用带4个磁馈线的曲线双偶极子天线对采油的影响。在这项研究中使用了两个相似的岩心样品。采用Poroperm系统测量了岩心样品的孔隙度和渗透率。为了提高采收率,将含油饱和的岩心样品保存在盐度为10000ppm的盐水罐中。这些岩心样品在室温和55°C下保存,有和没有电磁波。带4个磁性馈线的曲线双天线发射的电磁波在室温下能回收10.60%的OOIP,在55℃时能回收29.28%的OOIP。无电磁波的岩心样品在室温下的原油回收率为7.66%,在55℃下的原油回收率为23.15%。
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引用次数: 3
Wear preventive characteristics of esterified jatropha oil 酯化麻疯树油的防磨损特性
Pub Date : 2011-09-01 DOI: 10.1109/NATPC.2011.6136410
A. Lubis, M. Sudin, B. Ariwahjoedi
Jatropha oil has been known as alternative substitute for diesel fuel but its potential use as lubricant is not much known yet. Esterified jatropha oil has been successfully synthesized through esterification process to be used as lubricant additives. This study is meant to investigate wear preventive characteristics of esterified jatropha oil as potential renewable lubricant additives. The characteristics were obtained using four ball test configuration. Addition of low percentage esterified jatropha oil to mineral oil is found to have good effect in reducing wear.
麻疯树油被认为是柴油的替代品,但其作为润滑剂的潜在用途尚不清楚。通过酯化工艺成功合成了酯化麻风树油,并将其用作润滑油添加剂。本研究旨在探讨酯化麻疯树油作为潜在的可再生润滑油添加剂的防磨损特性。采用四球试验结构获得了其特性。在矿物油中加入低百分比酯化麻风树油,具有良好的减磨效果。
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引用次数: 2
Feasibility investigation of fault diagnosis using electromagnetic analysis of planar structures 平面结构电磁分析故障诊断的可行性研究
Pub Date : 2011-09-01 DOI: 10.1109/NATPC.2011.6136429
S. Socheatra, N. Ali, G. A. Ellis, A. Ahmadi
Testing of digital systems has been widely researched and studied. Many test methods have been developed and used. However, traditional voltage and current testing are not sufficient in modern integrated circuit (IC) design. This paper introduces a new method using electromagnetic field (EMF) generated from a circuit, which can be used to detect and diagnose possible faults in millimeter scale circuit. CST Microwave Studio and SONNET EM simulator are used to simulate detection of magnetic field intensity above several microstrip lines which are shorted and opened. Furthermore, the models have been fabricated on FR4 and measured the transmission coefficients by Network Analyzer. Both simulation and measurement show that faults in circuits result in high Standing wave for both short and open cases. Open line tends to induce higher Standing Wave (SW) than short line.
数字系统的测试已经得到了广泛的研究。已经开发和使用了许多测试方法。然而,在现代集成电路设计中,传统的电压和电流测试已经不够了。本文介绍了一种利用电路产生的电磁场对毫米级电路可能出现的故障进行检测和诊断的新方法。利用CST Microwave Studio和SONNET EM模拟器模拟了几条微带线短路和开断后的磁场强度检测。在FR4上建立了模型,并用网络分析仪测量了传输系数。仿真和测量结果表明,短路和开路情况下,电路故障都会产生高驻波。开放线路比短线路更易产生更高的驻波。
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引用次数: 0
Rheology of enhanced oil recovery polymers-a review 提高采收率聚合物的流变性研究进展
Pub Date : 2011-09-01 DOI: 10.1109/NATPC.2011.6136467
M. Hashmet, B. Demiral, Mohamed Ali, M. Kashif
Chemical flooding, in particular ASP flooding is of increasing interest because of current high prices and the need to increase oil production. Recent lab research has shown significant benefits to using surfactants at high PH even if the oil has a low acid no. & thus little if any surfactant is generated in-situ. So high ph surfactant-polymer flooding is also of great current interest. Normally, the problem in water flooding is unfavorable Mobility Ratio and because of it viscous fingering may occur and as a result of viscous fingering early break through will be observed, so low oil recovery will be obtained. The viscosity and the size of the emulsion formed in the reservoir is of great importance because if the size is too large and viscosity is high it can plug the pore spaces thus reducing the overall recovery and if the size is too small and viscosity is very low than the desirable sweep efficiency will not be achieved thus again causing reduction in recovery.
由于目前的高油价和提高石油产量的需求,化学驱,特别是三元复合驱越来越受到人们的关注。最近的实验室研究表明,即使油的酸度较低,在高PH下使用表面活性剂也有显著的好处。&因此,几乎没有任何表面活性剂在原地生成。因此,高ph的表面活性剂-聚合物驱也是当前研究的热点。通常情况下,水驱的问题是流动性比不利,因此可能会出现粘指现象,粘指现象会导致早期突破,从而导致采收率低。在储层中形成的乳化液的粘度和尺寸非常重要,因为如果尺寸太大,粘度太高,它会堵塞孔隙空间,从而降低整体采收率;如果尺寸太小,粘度太低,则无法达到理想的波及效率,从而再次导致采收率降低。
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引用次数: 1
A proposed framework for healthcare portal in Malaysia to encourage knowledge sharing 马来西亚医疗保健门户网站的拟议框架,以鼓励知识共享
Pub Date : 2011-09-01 DOI: 10.1109/NATPC.2011.6136295
Intan Najua Kamal-Nasir, D. D. Dominic
Our healthcare system nowadays is far more advanced from what we are twenty years ago. Adding to that, healthcare system is moving towards computerization and informative era. At this moment, implementation of Knowledge Management (KM) within healthcare system is very popular and motivating subject to focus. This paper listed and discussed two challenges faced by the Malaysian healthcare system, followed with the state of the art of the combination of KM and IT within healthcare system. The main KM mechanism focused in this paper is knowledge integration and knowledge sharing. We believe the successful of knowledge integration lead to opening the door to knowledge sharing. As the result, we suggested a theoretical framework for healthcare portal in Malaysia to encourage knowledge sharing using a case study scenario.
我们现在的医疗保健系统比二十年前先进得多。此外,医疗保健系统正走向电脑化和信息化时代。目前,在医疗保健系统中实施知识管理是非常受欢迎和激励的焦点问题。本文列出并讨论了马来西亚医疗保健系统面临的两个挑战,其次是医疗保健系统中知识管理和信息技术结合的最新状况。本文研究的知识管理机制主要是知识整合和知识共享。我们相信,知识整合的成功将为知识共享打开大门。因此,我们为马来西亚的医疗保健门户网站提出了一个理论框架,以鼓励使用案例研究场景的知识共享。
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引用次数: 2
Optimization approach for kinetics parameters determination for oil palm waste steam gasification with in-situ CO2 capture for hydrogen production 油棕废蒸汽就地捕集气化制氢动力学参数的优化研究
Pub Date : 2011-09-01 DOI: 10.1109/NATPC.2011.6136249
A. Inayat, M. M. Ahmad, M. Mutalib, S. Yusup
Biomass steam gasification with in-situ carbon dioxide capture using CaO exhibits good prospects for the production of hydrogen rich gas. The present work focused on the determination of reaction rate kinetics for hydrogen production from oil palm waste steam gasification using optimization approach in MATLAB. The kinetics parameters were calculated by fitting experimental data to kinetics model and minimization of least squared error between the model predictions and experimental results. The model was validated and showed good agreement with the literature. The developed model was used to investigate the effect of temperature and steam/biomass ratio on the product gas composition. Based on the results, hydrogen purity of more than 70 mol% can be achieved. It was found that increment in temperature and steam/biomass ratio is in favor of hydrogen production. The study provided a useful optimization approach for the determination of kinetics parameters for a specific biomass in future experimental work.
CaO原位捕集生物质蒸汽气化在生产富氢气方面具有良好的应用前景。研究了油棕废蒸汽气化制氢反应速率动力学的MATLAB优化方法。通过将实验数据拟合到动力学模型中,并使模型预测值与实验结果之间的最小二乘误差最小化来计算动力学参数。模型经过验证,与文献吻合较好。利用所建立的模型研究了温度和蒸汽/生物质比对产物气体组成的影响。结果表明,氢纯度可达70 mol%以上。结果表明,温度和蒸汽/生物质比的增加有利于制氢。该研究为今后实验中确定特定生物质的动力学参数提供了一种有益的优化方法。
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引用次数: 2
期刊
2011 National Postgraduate Conference
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