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Thermal and energy analysis of ceiling and pitch insulation for buildings in Malaysia 马来西亚建筑物天花板和沥青绝热材料的热能分析
Noor Hafizah Abdul Halim, A. Z. Ahmed, N. Zakaria
The aim of this study is to investigate the benefits of pitch insulation and ceiling insulation for air-conditioned buildings in the tropical climate of Malaysia. These are performed via computer simulations using a whole-building thermal energy software Integrated Environmental Solution (IES) with Apache Sim 6.0.2. The benefits are appraised by the thermal impact and the cooling load in three cooling modes due to the pitch insulation and ceiling insulation. The three cooling modes are 24-hr cooling, daytime and night-time cooling. The simulation is performed using the Subang weather data for the month of March that represents the hottest month in typical year weather data in Malaysia. Results show that advantage and the disadvantage of the insulation are more evident in the attic than in the indoor space underneath the ceiling. Compared to the non-insulated roof, pitch insulation reduces the daytime attic temperature up to 6.9°C but only about 0.4°C for the indoor. On the contrary, ceiling insulation elevates daytime attic temperature up to 2.2 °C but lowers the indoor temperature up to 0.8°C. Both insulations create adverse temporal effect in both spaces, however the advantage outweighs the disadvantage. Despite nominal thermal improvements, the month savings on the cooling load of about 6–24 % is noteworthy.
本研究的目的是调查沥青绝缘和天花板绝缘的空调建筑在马来西亚的热带气候的好处。这些都是通过使用带有Apache Sim 6.0.2的整个建筑热能软件集成环境解决方案(IES)的计算机模拟进行的。通过对沥青保温和吊顶保温三种冷却方式的热影响和冷负荷进行评价。三种冷却模式是24小时冷却,白天和夜间冷却。模拟是使用三月份的Subang天气数据执行的,三月份代表了马来西亚典型年份天气数据中最热的月份。结果表明,阁楼隔热的优点和缺点比天花板下的室内空间更为明显。与不保温的屋顶相比,沥青保温将白天阁楼的温度降低了6.9°C,而室内的温度仅降低了0.4°C左右。相反,天花板隔热层使阁楼白天的温度升高2.2°C,但使室内温度降低0.8°C。两种绝缘在两个空间中都会产生不利的时间效应,但优点大于缺点。尽管名义上的热改进,每月节省的冷却负荷约6 - 24%是值得注意的。
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引用次数: 7
Techno-economic analysis of an off-grid photovoltaic natural gas power system for a university 某高校离网光伏天然气发电系统技术经济分析
P. Sunderan, B. Singh, N. M. Mohamed, N. Husain
The objective of this study is to determine the technical and economical feasibility of a PV-natural gas hybrid power system to supply electricity and energy for a university in Malaysia. The yearly average daily solar radiation received at the university campus area is about 4.77 kWh/m2 and this provides for the implementation of a hybrid PV power system. Hybrid Optimization Model for Electric Renewables (HOMER) software was used to size, simulate and evaluate the hybrid power system in this analysis. The simulations provide some insights into the monthly electricity generated by the photovoltaic-natural gas system, net present cost (NPC) and cost of energy (COE) of the system, renewable fraction (RF) and greenhouse gas emissions of the system. The simulation in HOMER was performed for a 2MW PV generator together with 8.4 MW gas generator. From the simulation results, it is found that for a hybrid system with RF of 9%, the NPC of the hybrid system is US$ 123,231,728 and the COE is $0.272 which is much lower than what it would cost for a gas only system (RF is 0%). With the inclusion of PV, the amount of natural gas burned in the hybrid system was reduced and this in turn reduced the amount of environmentally polluting gases emitted into the atmosphere by 7.2% as compared to a gas only system. This analysis suggests that a PV hybrid power system should be implemented as it a cleaner and more economical method of power generation.
本研究的目的是确定为马来西亚一所大学提供电力和能源的光伏-天然气混合动力系统的技术和经济可行性。大学校园地区每年平均每天接收的太阳辐射约为4.77千瓦时/平方米,这为实现混合光伏发电系统提供了条件。本分析采用可再生电力混合优化模型(HOMER)软件对混合电力系统进行规模、仿真和评价。模拟提供了一些关于光伏-天然气系统的月发电量、系统的净当前成本(NPC)和能源成本(COE)、可再生部分(RF)和系统的温室气体排放的见解。在HOMER中对一台2MW光伏发电机组和8.4 MW燃气发电机组进行了仿真。仿真结果表明,对于RF为9%的混合动力系统,混合动力系统的NPC为123,231,728美元,COE为0.272美元,远低于纯燃气系统(RF为0%)的成本。由于采用了光伏发电,混合动力系统中燃烧的天然气量减少了,与纯气体系统相比,排放到大气中的污染气体量减少了7.2%。这一分析表明,光伏混合动力系统应该被实施,因为它是一种更清洁、更经济的发电方式。
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引用次数: 9
Distributed security policy for IPv6 deployment IPv6部署的分布式安全策略
W. Ali, A. Taib, N. Hussin, R. Budiarto, J. Othman
Internet Protocol version 6 (IPv6) is a next generation protocol that is designed to solve the problem of the current Internet Protocol version 4 (IPv4) depletion. With IPv6, almost anything in the world can be assigned an IPv6 address which makes communication between every single person to another possible. Besides, monitoring and sensing every single node or instrument can be done due to each item has its own IPv6 address. Realizing the features of IPv6, enterprise networks have begun deploying IPv6. Although they have not decided to deploy IPv6, IPv6 packet is possibly already in the network due to the most present operating systems supporting IPv6 and IPv6 enable is set as default. Deploying IPv6 in the existing IPv4 network results in coexistence of both protocols in the network. Thus, the coexistence condition exposed enterprise's network to higher probability of vulnerabilities and attacks. Hence, several security policies should be created to maintain security for both IPv4 and IPv6. A proper mechanism to manage the policies to ensure a secure IPv6 deployment is a necessity. Since enterprises have many branches and counterparts, it is essential to have a mechanism to distribute the policies among their branches or subnets. Therefore, the proper mechanism to distribute the security policy which will also support the green computing environment should be formed.
Internet Protocol version 6 (IPv6)是为解决当前Internet Protocol version 4 (IPv4)耗尽的问题而设计的下一代协议。有了IPv6,世界上几乎任何东西都可以被分配一个IPv6地址,这使得每个人之间的通信成为可能。此外,由于每个项目都有自己的IPv6地址,因此可以对每个单个节点或仪器进行监控和传感。在认识到IPv6的特性后,企业网络已经开始部署IPv6。虽然他们还没有决定部署IPv6, IPv6数据包可能已经在网络中,因为大多数目前的操作系统支持IPv6和IPv6启用设置为默认值。在现有的IPv4网络中部署IPv6,会导致两种协议在网络中共存。因此,这种共存状态将企业网络暴露在更高的漏洞和攻击概率之下。因此,应该创建几个安全策略来维护IPv4和IPv6的安全性。一个适当的机制来管理策略,以确保安全的IPv6部署是必要的。由于企业有许多分支机构和对等机构,因此必须有一种机制在其分支机构或子网之间分发策略。因此,需要形成一种支持绿色计算环境的安全策略分发机制。
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引用次数: 4
Biomonitoring of heavy metals using soil near Teluk Ewa cement plant: Preliminary study 木陆埃瓦水泥厂附近土壤重金属生物监测:初步研究
Franky S. Lias, K. Jamil, D. Norsila
Biomonitoring technique has been used to obtain quantitative information on the quality of the environment by using soil as its agent. Soil samples were collected on the 12 December 2010, dried in oven, homogenized, grinded and sieved (63μm) and digested with nitric acid and perchloric acid in microwave digestion. Five (5) elements were determined (Co, Cd, Cu, Ni and Pb) and the digested samples were analyzed using Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The concentration of cobalt, cadmium, copper, lead and nickel were 1.52–3.8 mg/kg, 0.0014–0.066 mg/kg, 3.88–15.9 mg/kg, 3.8–11.7 mg/kg and 16.1–76.9 mg/kg respectively. Result showed that the distribution of heavy metals is slightly higher close to cement plant and decreased as the distance farther. The enrichment factor data indicated that cobalt, cadmium copper, lead and nickel were undergone minimal enrichment.
生物监测技术以土壤为媒介,获得环境质量的定量信息。2010年12月12日采集土壤样品,经烘箱干燥、均质、粉碎、筛分(63μm),用硝酸和高氯酸微波消解。测定了5种元素(Co、Cd、Cu、Ni和Pb),并用电感耦合等离子体质谱(ICP-MS)对消解后的样品进行分析。钴、镉、铜、铅、镍的浓度分别为1.52 ~ 3.8 mg/kg、0.0014 ~ 0.066 mg/kg、3.88 ~ 15.9 mg/kg、3.8 ~ 11.7 mg/kg和16.1 ~ 76.9 mg/kg。结果表明:在水泥厂附近,重金属的分布略高,随距离的增加而减少。富集因子数据表明,钴、镉、铜、铅和镍的富集程度较低。
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引用次数: 4
Neem crude extract as Biomolluscicide for sustainable control of golden apple snail, Pomacea canaliculata 印楝粗提物作为生物杀虫剂对金苹果螺的可持续防治
Rosdiyani Massaguni, S. Latip
Golden apple snail, (Pomacea canaliculata) was reported could cause severe damage on food crop especially paddy, which is a staple food for more than 60% of the world population. The farmers mostly rely on chemical and synthetic molluscicides to overcome this problem which improper use of pesticide could give negative impact on environmental. Therefore, there is a need to determine the potential botanical molluscicides in order to ensure the low cost and efficient pest management control method along with protection of the environment. The present study investigated the toxicity of two different neem plant parts (leaves and seeds) against small (10–20mm) and large (20–40mm) sizes of golden apple snails using bioassay. The crude extract treatments were incorporated into the paddy seedlings as a food source of golden apple snails and the concentrations of the leaves and seeds crude extract, which killed 50% of the test population (LC50) determined the efficacy of selected extracts. From the result, both plant parts have ability in controlling golden apple snail but aqueous neem leaves crude extract was expressed the most effective controlled compared with aqueous seeds crude extract for both size of golden apple snails. It caused high rate of snail mortality after 96 hours with 93.33% and 84.17% compared to 71.67% and 73.33% for different sizes of golden apple snail, respectively. In addition, aqueous neem leaves crude extract also have the potency in controlling both sizes of golden apple snails with low concentration compared to aqueous neem seeds crude extract. In the observation of the toxicity effects, LC50 values was lower for neem leaves crude extract with of 44,196.9 ppm and 49,801.5 ppm followed by aqueous neem seeds crude extract with LC50 of 103,551 ppm and 104,475 ppm for both sizes of golden apple snails. The results of this study suggested that aqueous neem plant extract can be used for controlling golden apple snail and its application can be provided an alternative way for sustainable pest control in paddy field.
据报道,金苹果螺(Pomacea canaliculata)会对粮食作物,特别是水稻造成严重危害,而水稻是世界上60%以上人口的主食。农民主要依靠化学杀螺剂和合成杀螺剂来解决这一问题,而农药的不当使用会对环境造成负面影响。因此,有必要确定潜在的植物性杀螺剂,以确保低成本和高效的害虫防治方法,同时保护环境。本研究采用生物测定法研究了两种不同的印楝植物部分(叶片和种子)对小(10-20mm)和大(20-40mm)尺寸的金苹果蜗牛的毒性。将粗提物处理作为金苹果螺的食物来源,加入稻谷苗中,以金苹果螺叶片和种子粗提物的浓度(LC50)(杀死50%的试验种群)确定所选提取物的效果。结果表明,两种植物部位对金苹果螺均有抑制作用,但印楝叶水提液对两种大小的金苹果螺的抑制效果均优于种子水提液。不同大小的金苹果钉螺96 h死亡率分别为71.67%和73.33%,96 h死亡率分别为93.33%和84.17%。此外,印楝叶水提物与印楝种子水提物相比,对低浓度金苹果螺的两种大小均有控制作用。在对两种大小的金苹果螺的毒性作用观察中,印楝叶粗提取物的LC50值较低,分别为44,196.9 ppm和49,801.5 ppm,印楝籽水提取物的LC50值较低,分别为103,551 ppm和104,475 ppm。本研究结果表明,印楝水提物可用于防治金苹果螺,为水田害虫的可持续防治提供了新的途径。
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引用次数: 2
Effect of additives on lubrication properties of palm oil-based trimethylolpropane ester for hydraulic fluid application 添加剂对棕榈油基三甲基丙烷酯液压油润滑性能的影响
Norulaina Alias, R. Yunus, A. Idris
Hydraulic fluids are liquids used as the motive medium in hydraulic machinery and equipment. The current interest in protecting the environment has created a demand for vegetable-based and biodegradable hydraulic fluids. However, the lubricating properties of the vegetable-based such as poor oxidative stability and high pour point have hindered their use. In this study, Trimethylolpropane (TMP) Ester or TMPE, which is derived from palm oil-based methyl ester (POME), was used as the base fluid. The objective of this research is to study the lubrication properties of the formulated TMPE (TMPE + 1.0% of Additive A), namely the pour point (PP) test, wear and friction test and filterability test. The pour point obtained from this research was 10°C before applied to the lab-scale hydraulic test rig. This reading is much higher if compared to the commercial hydraulic fluid, which has the pour point of −30°C. Nevertheless, this result was slightly comparable to the unformulated TMPE, 12°C. The wear test shows that at 15 kg load, the WSD was 1.0 mm before application (at 0 hour), with the coefficient of friction (CoF) was 0.04 as compared to the WSD of unformulated oil, 0.46 mm and CoF of 0.04. There is no data available at 15kg load for the commercial hydraulic oil compared. Meanwhile, at 40 kg load, the WSD recorded was 3.24 mm before the application compared to commercial hydraulic oil, 0.36 mm and unformulated oil, 0.64 mm. After 800 hours application, the WSD increase sharply both for 15 kg (1049 mm) and 40 kg (3364 mm). It showed that there were particles built in the formulated oil. This is supported by the filterability study.
液压油是在液压机械和设备中用作动力介质的液体。当前对环境保护的兴趣产生了对植物基和可生物降解液压油的需求。然而,植物基润滑油氧化稳定性差、倾点高等特性阻碍了其应用。本研究以棕榈油基甲酯(POME)为原料,制备了三甲基丙烷(TMP)酯(TMPE)作为基液。本研究的目的是研究配制的TMPE (TMPE + 1.0%添加剂A)的润滑性能,即倾点(PP)测试、磨损摩擦测试和过滤性能测试。在应用于实验室规模的水力试验台之前,本研究获得的倾点为10°C。如果与商业液压流体相比,该读数要高得多,其倾点为- 30°C。然而,该结果与未配制的TMPE(12°C)略有相似。磨损试验表明,在15 kg载荷下,应用前(0小时)WSD为1.0 mm,摩擦系数(CoF)为0.04,而未配制油的WSD为0.46 mm, CoF为0.04。在15kg负荷下没有可用的数据与商用液压油进行比较。同时,在负载为40 kg时,应用前的WSD记录为3.24 mm,而商用液压油为0.36 mm,未配制油为0.64 mm。施用800小时后,WSD分别急剧增加15公斤(1049毫米)和40公斤(3364毫米)。结果表明,配方油中含有颗粒。过滤性研究支持了这一点。
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引用次数: 2
A content analysis of creative execution on green advertisements in Malaysia 马来西亚绿色广告创意执行的内容分析
Suhaimee Saahar Saabar, Ahmad Faisal Mohd Fiah, A. Halim, A. M. Nor
Awareness among society members is a crucial point in promoting environmental issues in the world especially Malaysia. Various steps have been taken by the relevant authorities to increase awareness on environmental issues. One of the steps is to disseminate information through media. Another step is by executing environmental campaign through advertising whether in print or electronic. However, it would be a “wasteful” campaign if advertisement on environment in media is not effective or will not be able to attract public attention. Therefore, it is strongly believed that one of the essential criteria in the advertisement is creative execution. This paper aims to study the green advertising in Malaysia focussing on green print advertisement in four selected magazines published in March 2011. Five objectives are set which are to analyse (1) ad's characteristics in selected green advertisements, (2) ad's greenness contains in selected green advertisements, (3) ad's objectives in selected green advertisements, (4) ad's appeals contain in selected green advertisements and (5) environmental issues contain in selected green advertisements. Analytical framework introduced by Banerjee, et. al (1995) was adopted in this study.
社会成员的意识是促进世界特别是马来西亚环境问题的关键。有关当局已采取各种措施提高人们对环境问题的认识。其中一个步骤是通过媒体传播信息。另一个步骤是通过印刷或电子广告来执行环保运动。然而,如果媒体上的环境广告没有效果,或者不能引起公众的注意,这将是一个“浪费”的运动。因此,人们强烈认为广告的基本标准之一是创意执行。本文旨在研究马来西亚的绿色广告,重点研究2011年3月出版的四本杂志上的绿色平面广告。本文设定了五个目标,分别分析(1)所选绿色广告中的广告特征,(2)所选绿色广告中的广告的绿色性,(3)所选绿色广告中的广告目标,(4)所选绿色广告中的广告诉求,(5)所选绿色广告中的环境问题。本研究采用Banerjee等(1995)提出的分析框架。
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引用次数: 2
The evaluation of self consolidating concrete incorporating crushed concrete waste aggregate 掺废碎石自固结混凝土的性能评价
A. Ridzuan, M. Fauzi, Azman Kassim
Self consolidating concrete (SCC) is an innovative concrete that does not require vibration for placing and compaction. It offers a rapid rate of concrete placement, with faster construction times and ease of flow around congested reinforcement. The improved construction practice and performance, combined with the health and safety benefits, make SCC a very attractive solution for both precast concrete and civil engineering construction [1]. If the production of concrete wastes is not managed properly, Malaysia will face major environmental problems. The Government will have to bear the unnecessary costs for clean-ups, repairs and protection measures on illegal dumping areas and providing more landfills. Recycling of waste concrete as crushed concrete waste aggregate (CCWA) for new concrete is beneficial for environmental preservation and effective utilization of resources. This study is to determine the compressive strength performance of SCC using CCWA as coarse aggregate with various replacement percentages of 0%, 25%, 50%, 75% and 100% of CCWA to normal aggregate for grade 30 N/mm2 concrete. The specimens were tested for compressive strength at 3, 7, 14 and 28 days age. Results indicated that the compressive strength of SCC containing up to 25% CCWA coarse aggregate replacement is comparable to the compressive strength of normal aggregate SCC.
自固结混凝土(SCC)是一种不需要振动即可浇筑和压实的新型混凝土。它提供了快速的混凝土放置速度,施工时间更快,并且易于在拥挤的钢筋周围流动。改进的施工实践和性能,结合健康和安全效益,使SCC成为预制混凝土和土木工程施工中非常有吸引力的解决方案[1]。如果对混凝土废料的生产管理不当,马来西亚将面临重大的环境问题。政府将不得不承担清理、维修和保护非法倾倒区以及提供更多堆填区的不必要费用。回收废旧混凝土作为混凝土碎骨料生产新混凝土,有利于环境保护和资源的有效利用。本研究的目的是确定30 N/mm2级混凝土使用CCWA作为粗骨料,CCWA替代普通骨料的比例分别为0%、25%、50%、75%和100%的SCC抗压强度性能。分别在3、7、14、28日龄进行抗压强度试验。结果表明,含25% CCWA粗骨料的SCC抗压强度与普通骨料的SCC抗压强度相当。
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引用次数: 6
Total Multi-intervention Cost of Passive Architecture Terraced House 被动式建筑排屋多介入总成本
W. Zaki, A. H. Nawawi, S. Ahmad
Passive Architecture (PA) Terraced House has been deduced as a likely alternative to a Typical Terraced House, particularly when the former provides favourable indoor environmental conditions for a longer duration compared to the latter. Coupled with Energy Efficient (EE) appliances and Renewable Energy (RE), PA Terraced House saves the Operational Energy (OE) cost for the household. This paper advocates the above actions should be applied collectively for the least Total Multi-intervention Cost (TMC) in the long term. This study demonstrates the TMC for PA Terraced House in comparison with the Typical Terraced House for a 30-year study period. The result shows that the highest TMC for PA Terraced House is lower than the lowest TMC for Typical Terraced House, making PA Terraced House worth the while for household. It also shows that PA Terraced House increases the efficacy of EE appliances and RE system, namely solar photovoltaic (PV), thus closing the economic gap between these items and the conventional ones.
被动式建筑(PA)的排屋被推断为典型排屋的一种可能的替代方案,特别是与后者相比,前者提供了更长的有利室内环境条件。加上节能(EE)电器和可再生能源(RE), PA排屋为家庭节省了运营能源(OE)成本。本文认为,从长期来看,上述措施应共同实施,以使总多干预成本最小。本研究通过30年的研究,对比了PA排屋与典型排屋的TMC。结果表明,PA排屋的最高TMC低于典型排屋的最低TMC,值得作为家庭使用。它还表明,PA排屋提高了能效电器和可再生能源系统,即太阳能光伏(PV)的效率,从而缩小了这些项目与传统项目之间的经济差距。
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引用次数: 0
Measurement of natural radionuclides in the soil of Highlands agricultural farmland 高原农田土壤中天然放射性核素的测定
M. Musa, Z. Hamzah, A. Saat
Natural occuring radioctive material (NORM) is distributed in the environment including soil. It consist the gamma emmiting radionuclides such as 40K, the decay products of 238U and 232Th such as 214Bi, 214Pb (representing 226Ra) and 228Ac (representing 228Ra). This study was carried out to determine the radioactivity concentration of NORM in soil, to calculated the radium equivalent, absorbed dose, annual effective dose and external hazard index level for the study area. The measurement was done by using gamma spectrometer with high resolution hyperpure germenium (HPGe) detector. Soil samples were collected using hand auger from the highland agricultural farm area in Cameron Highlands. These samples were dried, pulverized and sieved prior to analysis. The range of the radionuclides activity concentration for 40K is 363.6 to 1244.1Bq Bq/kg; range for 226Ra is 131.1 to 200.0 Bq/kg 228Ra 18.6 to 237.7 Bq/kg and Radium equivalent activity range 222 to 453 Bq/kg; 153.2 to 263.8 nGy/h is the range for absorbed dose rate while annual dose range from 0.17 to 0.30 mSv. External hazard index is in the range of 0.92–1.54, which are higher than unity. These value should be less than unity in order to keep the radiation hazard to be insignificant. Therefore, it can be concluded that soil from this study area might be contaminated by the fertilizer applied to the the plants itself and from the geological and geographial location soil types.
自然存在的放射性物质(NORM)分布在包括土壤在内的环境中。它由发射伽马的放射性核素如40K, 238U和232Th的衰变产物如214Bi, 214Pb(代表226Ra)和228Ac(代表228Ra)组成。本研究旨在测定NORM在土壤中的放射性浓度,计算研究区土壤中的镭当量、吸收剂量、年有效剂量和外源危害指数水平。采用高分辨率超纯锗(HPGe)探测器的伽马能谱仪进行测量。在金马仑高原的高地农业农场地区,用手动螺旋钻采集土壤样本。这些样品在分析前经过干燥、粉碎和筛分。40K时放射性核素活度浓度范围为363.6 ~ 1244.1Bq /kg;226Ra的范围为131.1至200.0 Bq/kg; 226Ra的范围为18.6至237.7 Bq/kg;镭当量活度范围为222至453 Bq/kg;153.2 ~ 263.8 nGy/h为吸收剂量率范围,年剂量范围为0.17 ~ 0.30 mSv。外部危害指数为0.92 ~ 1.54,高于统一。为了使辐射危害不显著,这些值应小于1。因此,本研究区土壤可能受到植物本身施用的肥料和地质地理位置土壤类型的污染。
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引用次数: 6
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2011 3rd International Symposium & Exhibition in Sustainable Energy & Environment (ISESEE)
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