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2011 3rd International Symposium & Exhibition in Sustainable Energy & Environment (ISESEE)最新文献

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Coal liquefaction using semi-continuous solvent flow two-stage reactor system: Optimizing using response surface methodology (RSM) 半连续溶剂流两级反应器系统煤液化:响应面法优化
Muhammad Taqi-uddeen Safian, Z. A. Ghani, K. Ismail, M. Ishak
Response surface methodology (RSM) was applied to optimize the condition for liquefaction process of Mukah Balingian (MB) low-rank Malaysian coal by using semi-continuous solvent flow two-stage reactor system. The reaction was performed by using tetralin as the solvent. A central composite rotatable design (CCRD) was employed to optimize the effect of three important reaction variables, i.e. flow-rate (ml/min), reaction time (min) and Ni loading (wt.%). A total of 20 experiments were conducted. It was concluded that the liquefaction should be carried out under solvent flow-rate of 1.12 ml/min, reaction time of 60 min and 5 wt.% of NiSiO2 loading. Under the optimum conditions, the corresponding response value for oil+gas yield was 71.25 %.
采用响应面法(RSM)对马来西亚Mukah Balingian (MB)低阶煤半连续溶剂流两级反应器系统液化工艺条件进行了优化。以四氢化萘为溶剂进行反应。采用中心复合旋转设计(CCRD)对流速(ml/min)、反应时间(min)和Ni负载(wt.%)三个重要反应变量的影响进行优化。共进行了20次实验。结果表明,在溶剂流量为1.12 ml/min,反应时间为60 min, NiSiO2加量为5 wt.%的条件下进行液化。在最优条件下,相应的油气产量响应值为71.25%。
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引用次数: 1
The effects of air velocity and temperature on drying kinetics of oil palm fronds (OPF) 风速和温度对油棕叶片干燥动力学的影响
N. Saadon, H. Yusof
In the future, OPF is believed to be a very precious raw material since it can be a highly demanded commercial products and renewable energy. Due to this, effective drying method needs to be determined so that the fronds, which currently are left scattering to rotten in most of the oil palm plantations in Malaysia, are not abundantly wasted and they can be dried as to sustain their quality. Therefore, this research investigated the effects of two significant air drying conditions, which are temperature and air velocity, on the drying kinetics of OPF. The experiment used stirred fluidized bed dryer as an alternative to the existing drying methods since it has been proven to be efficient. Different temperatures, which are 60°C, 70°C and 90°C, and the air velocities of 1.45 ms−1 and 1.85 ms−1, were chosen in the experiment. The findings show that the higher the temperature, the shorter the drying time. Furthermore, the air velocity is only significantly effective to the drying rate when the operating air temperature is high.
在未来,OPF被认为是一种非常宝贵的原材料,因为它可以成为高需求的商业产品和可再生能源。因此,需要确定有效的干燥方法,使目前在马来西亚大多数油棕种植园中散落腐烂的叶子不会被大量浪费,并且可以干燥以保持其质量。因此,本研究考察了温度和风速这两种重要的空气干燥条件对OPF干燥动力学的影响。实验采用搅拌流化床干燥机作为现有干燥方法的替代方法,因为它已被证明是有效的。实验温度分别为60℃、70℃和90℃,风速分别为1.45 ms−1和1.85 ms−1。结果表明,温度越高,干燥时间越短。此外,风速只有在工作空气温度较高时才对干燥速度有显著影响。
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引用次数: 0
Descriptive analysis on the pattern of SME financing in Malaysia 马来西亚中小企业融资模式的描述性分析
Siti Khadijah Ab. Manan, J. Othman, Asmady Shahadan
Previous studies around the world in the field of financing indicate that the small and medium-sized enterprises (SMEs) used more debts rather than equity as a source of external capital. In other words, debt is found to be superior form of financing compared to equity even though credit constraint is still found to have persisted as among the main hurdles to the survival and longevity of the enterprises. The question of whether there is similarity between the stylized patterns of SMEs financing in other parts of the world with that of Malaysian SMEs is something that this study would attempt to investigate. Using descriptive analysis, findings of this study showed that the SMEs in Malaysia are no less different from the rest of their counterparts. One interesting highlight of this study is the fact that a significant number of SMEs sought Islamic financing modes such as Murabahah, Bai' bithaman Ajil and Ijarah as sources of external capital. This could give positive signal for the Islamic financial institutions to offer more of such facilities to the SMEs.
以往世界各国在融资领域的研究表明,中小企业更多地使用债务而不是股权作为外部资本的来源。换句话说,与股权相比,债务被认为是一种优越的融资形式,尽管信贷约束仍然是企业生存和长寿的主要障碍之一。世界其他地区中小企业融资的程式化模式与马来西亚中小企业融资的程式化模式之间是否存在相似性的问题是本研究将试图调查的问题。使用描述性分析,本研究的结果表明,马来西亚的中小企业与其他同行的差异并不小。这项研究的一个有趣的亮点是,相当多的中小企业寻求伊斯兰融资模式,如Murabahah、Bai' bithaman Ajil和Ijarah作为外部资本来源。这可能为伊斯兰金融机构向中小企业提供更多此类设施提供积极信号。
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引用次数: 16
Poly[2-methoxy-5-(2';-ethylhexyloxy)-(p-phenylenevinylene)] (MEH-PPV) synthesized via a modified Gilch method and the electrical conductivities of MEH-PPV/MCMB films 采用改进的Gilch法合成了聚[2-甲氧基-5-(2′;-乙基己氧基)-(对苯乙烯)](MEH-PPV),并对MEH-PPV/MCMB薄膜的电导率进行了研究
N. Kamarulzaman, N. D. Aziz, R. Subban, A. S. Hamzah, A. Z. Ahmed, Z. Osman, R. Rusdi, N. Kamarudin, N. Jumali, Z. Shaameri
Poly[2-methoxy-5-(2'-ethylhexyloxy)-(p-phenylenevinylene)] (MEH-PPV) was obtained via the modified Gilch route. The expected polymer was obtained in an overall yield of 19.5%. The structures of all synthesized intermediates and MEH-PPV fully complied with their respective spectroscopic data using 1H and 13C nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopies. Thermal properties of the polymer was studied using simultaneous thermogravimetry and differential scanning calorimetry (TGA/DSC) and morphologies by transmission electron microscopy (TEM). The glass transition temperature, Tg, of MEH-PPV was obtained at 85 °C. TEM results showed that the material was amorphous. Results showed that pure MEH-PPV exhibited high impedance at room temperature but the impedance increases in the MEH-PPV/MCMB composite. The MEH-PPV/MCMB composite film shows an increase in conductivity of the order of 2. The enhancement of conductivity of MEH-PPV by the addition of MCMB was attributed to the change in morphology of the film and contribution of electrons by carbon in the polymer matrix.
采用改良的Gilch法合成了聚[2-甲氧基-5-(2′-乙基己氧基)-(对苯乙烯)](MEH-PPV)。该聚合物的总收率为19.5%。所有合成的中间体和MEH-PPV的结构完全符合各自的1H和13C核磁共振(NMR)和傅里叶变换红外(FTIR)光谱数据。采用热重/差示扫描量热法(TGA/DSC)和透射电子显微镜(TEM)研究了聚合物的热性能。在85℃时得到了MEH-PPV的玻璃化转变温度Tg。TEM结果表明,该材料呈非晶态。结果表明,纯MEH-PPV在室温下具有较高的阻抗,而MEH-PPV/MCMB复合材料的阻抗增加。MEH-PPV/MCMB复合膜的电导率提高了2个数量级。MCMB的加入对MEH-PPV电导率的提高是由于薄膜形态的改变和聚合物基体中碳对电子的贡献。
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引用次数: 4
Thermal performance of naturally ventilated test building with pitch and ceiling insulation 带沥青和天花板保温的自然通风试验建筑的热工性能
F. Morris, A. Z. Ahmed, N. Zakaria
A field study was carried out to evaluate the benefits of insulated roof and insulated ceiling for naturally ventilated buildings in Malaysia. Two identical test cells with dimensions of 4m × 4m × 3m were used as building samples. Both test cells have identical design and were constructed with conventional building envelope. The non-insulated control unit is named as Test Cell A (TCA) while the insulated test unit is named as Test Cell B (TCB). Conductive thermal insulation of R-value 2.22 (m2K/W) and 2.88 (m2K/W) was consecutively installed at the roof pitch and internal ceiling respectively. For each insulation configuration, the outdoor and indoor environmental data for both test cells were concurrently monitored using automated data logging equipments. Data logging duration was five days for roof pitch insulation and ten days for ceiling insulation. This paper presents the findings on thermal impact on the non-insulated Test Cell A and insulated Test Cell B. These are appraised by the respective indoor temperature. The finding shows that pitch insulation and ceiling insulation lower the daytime indoor temperature up to 0.8°C and 0.6°C respectively. However, both have adverse impact at night. It is concluded that both pitch and ceiling insulations are beneficial to reduce the day-time thermal impact. The impact is more significant with the pitch insulation. Due to the nominal temperature differential to determine the benefits on the thermal comfort conditions, a cooling load analyses could further substantiate the advantage and disadvantage of the insulation.
进行了一项实地研究,以评估马来西亚自然通风建筑物隔热屋顶和隔热天花板的效益。采用两个尺寸为4m × 4m × 3m的相同试验单元作为建筑样品。两个测试单元具有相同的设计,并采用传统的建筑围护结构。非绝缘的控制单元称为测试单元A (TCA),绝缘的测试单元称为测试单元B (TCB)。在屋面坡面和内顶棚处依次安装r值为2.22 (m2K/W)和2.88 (m2K/W)的导热保温材料。对于每种绝缘配置,使用自动数据记录设备同时监测两个测试单元的室外和室内环境数据。记录时间为顶棚保温5天,顶棚保温10天。本文介绍了对非绝缘测试单元A和绝缘测试单元b的热影响的研究结果,并通过各自的室内温度进行了评估。结果表明,俯仰保温和顶棚保温分别使室内白天温度降低了0.8°C和0.6°C。然而,两者在夜间都有不利影响。综上所述,沥青保温和吊顶保温都有利于减少白天的热影响。随着间距的增加,这种影响更为显著。由于标称温度差来确定热舒适条件的好处,冷负荷分析可以进一步证实隔热的优点和缺点。
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引用次数: 7
Parametric study on ZnO nanostructures for solar cell applications 太阳能电池用ZnO纳米结构的参数化研究
Khalifa Al-Azri, M. Al-Ruqeishi, R. Nor, Y. M. Amin
A study on the formation of ZnO nanostructures using the carbothermal evaporation method without catalyst and at atmospheric argon pressure has been conducted. The effects of the position of the substrates to the source and deposition time were investigated. The results of these parametric studies based on field-emission scanning electron microscopy (FESEM), Energy dispersive X-ray spectroscopy (EDX) spectrum and X-ray diffraction (XRD) analyses support the reduction-evaporation model for ZnO nanostructures formation using carbothermal evaporation. We suggested that ZnO nanostructures that have been synthesized in this work have potential applications in solar cells.
研究了在常压氩气条件下无催化剂碳热蒸发法制备ZnO纳米结构。研究了衬底位置对源和沉积时间的影响。基于场发射扫描电镜(FESEM)、能量色散x射线能谱(EDX)和x射线衍射(XRD)分析的参数研究结果支持了碳热蒸发形成ZnO纳米结构的还原-蒸发模型。我们认为,在这项工作中合成的ZnO纳米结构在太阳能电池中具有潜在的应用前景。
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引用次数: 0
Production of xylanase enzyme through bioconversion of agricultural waste 通过农业废弃物的生物转化生产木聚糖酶
I. Norazlina, S. Puvanesvaran
Oil palm fronds (OPF) which were collected from Sime Darby Oil Palm Factory Merlimau, Melaka can be used as substrates for the cultivation of various microorganisms for the production of different products which are important for industrial application via solid state fermentation (SSF), particularly for this research, xylanase enzyme. SSF is generally defined as the growth of the microorganisms on solid material in the absence or near absence of free water. Fungi are attracting greater interest than bacteria as potential sources of plant cell wall hydrolyzing xylanases because they secrete high levels of the enzymes into the culture medium. Thus, a fungi namely Aspergillus niger (obtained from the Microbiology Laboratory, University Selangor) was used to degrade the hemicelluloses (found in the substrate) and produce xylanase as the secondary metabolite. Xylanase can be used in the food and beverage, feedstock improvement, kraft pulp bleaching, in poultry industry, de-inking of newspaper and agricultural waste degradation. Three fermentation parameters were studied in the research, namely fermentation days, moisture content of the fermentation medium and carbon source. The best day for the optimum xylanase production was in day six with the enzyme activity of 0.6506 U/min. Meanwhile, 70% of the moisture content gives the highest enzyme activity of 0.624 U/min and carbon source from sucrose gives 0.624 U/min of xylanase activity compared to other carbon sources.
油棕叶(OPF)采集自马六甲Merlimau的Sime Darby Oil palm工厂,可作为培养各种微生物的底物,用于通过固态发酵(SSF)生产不同的产品,这些产品对工业应用很重要,特别是在本研究中,木聚糖酶。SSF通常被定义为微生物在没有或几乎没有自由水的情况下在固体物质上生长。与细菌相比,真菌作为植物细胞壁水解木聚糖酶的潜在来源引起了更大的兴趣,因为它们在培养基中分泌高水平的酶。因此,一种真菌即黑曲霉(从雪兰莪大学微生物实验室获得)被用来降解半纤维素(在底物中发现)并产生木聚糖酶作为次级代谢物。木聚糖酶可用于食品饮料、原料改良、硫酸盐浆漂白、家禽业、报纸脱墨和农业废弃物降解等领域。研究了发酵天数、发酵培养基含水率和碳源三个发酵参数。木聚糖酶的最佳产酶期为第6天,酶活性为0.6506 U/min。70%水分条件下木聚糖酶活性最高,为0.624 U/min,蔗糖碳源木聚糖酶活性最高,为0.624 U/min。
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引用次数: 3
Simulation and performance of thermal energy storage system at Engineering Complex, UiTM Shah Alam, Selangor 雪兰莪大学沙阿南分校工程中心热能储存系统的模拟与性能
A. H. Kassim, M. Aziz, Z. Zain
This paper presents on the simulation of the performance of Thermal Energy Storage (TES) system at Engineering Complex, Universiti Teknologi MARA Shah Alam Selangor. The criteria for thermal energy storage systems and coefficient of performance (COP) are discussed. The data obtained were observed and analyzed to measure the COP of Engineering Complex. A simulation programming by using visual basic to get the value of COP and observe the performance of TES is illustrated in the paper.
本文介绍了在雪兰莪州沙阿南玛拉理工大学工程综合体的热储能(TES)系统的性能模拟。讨论了蓄热系统的准则和性能系数(COP)。对所得数据进行观察和分析,以测量工程综合体的COP。本文介绍了用visualbasic进行仿真编程,以获得COP值并观察TES的性能。
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引用次数: 1
Modeling and simulation of Photovoltaic (PV) array and maximum power point tracker (MPPT) for grid-connected PV system 并网光伏系统中光伏阵列和最大功率点跟踪器的建模与仿真
A. H. M. Nordin, A. M. Omar
In this paper a validated, generic and user-friendly PV array and MPPT models are presented in the mathematical modeling and circuit-based approach. The PV array model accepts irradiance and temperature as variable parameters and outputs I-V and P-V characteristics. The Hill Climbing (HC) algorithm is implemented to track the maximum power point (MPP). The model is validated against data obtained from an installed PV system at Malaysia Green Technology Corporation (MGTC) in Bangi, Selangor, Malaysia with installed capacity of 47.28 kWp. From the comparison of the simulated results with that of the MGTC, it clearly shows that power produced in simulation is higher than the actual. This is due to some factors itemized in this work.
本文在数学建模和基于电路的方法中提出了一个经过验证的、通用的、用户友好的光伏阵列和MPPT模型。PV阵列模型接受辐照度和温度作为可变参数,输出I-V和P-V特性。采用爬坡(HC)算法跟踪最大功率点(MPP)。该模型通过马来西亚绿色技术公司(MGTC)在马来西亚雪兰莪州邦吉市安装的光伏系统数据进行验证,该系统的装机容量为47.28 kWp。通过与MGTC的仿真结果比较,可以清楚地看出,仿真产生的功率要高于实际功率。这是由于本工作中列出的一些因素造成的。
{"title":"Modeling and simulation of Photovoltaic (PV) array and maximum power point tracker (MPPT) for grid-connected PV system","authors":"A. H. M. Nordin, A. M. Omar","doi":"10.1109/ISESEE.2011.5977080","DOIUrl":"https://doi.org/10.1109/ISESEE.2011.5977080","url":null,"abstract":"In this paper a validated, generic and user-friendly PV array and MPPT models are presented in the mathematical modeling and circuit-based approach. The PV array model accepts irradiance and temperature as variable parameters and outputs I-V and P-V characteristics. The Hill Climbing (HC) algorithm is implemented to track the maximum power point (MPP). The model is validated against data obtained from an installed PV system at Malaysia Green Technology Corporation (MGTC) in Bangi, Selangor, Malaysia with installed capacity of 47.28 kWp. From the comparison of the simulated results with that of the MGTC, it clearly shows that power produced in simulation is higher than the actual. This is due to some factors itemized in this work.","PeriodicalId":105476,"journal":{"name":"2011 3rd International Symposium & Exhibition in Sustainable Energy & Environment (ISESEE)","volume":"495 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126871652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 64
期刊
2011 3rd International Symposium & Exhibition in Sustainable Energy & Environment (ISESEE)
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