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Search Results: 1 - 10 of 122 matches for " Tursun Mamat "
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The Development and Characterization of Zirconia-Silica Sand Nanoparticles Composites  [PDF]
Tahir Ahmad, Othman Mamat
World Journal of Nano Science and Engineering (WJNSE) , 2011, DOI: 10.4236/wjnse.2011.11002
Abstract: The present study aims to develop zirconia-Silica sand nanoparticles composites through powder processing route and to study the physical properties, mechanical properties and microstructure of the composites. Zirconia based silica sand nanoparticles composite with 5, 10, 15 and 20 wt.% were developed through powder processing technique and sintered at 1500 ℃ for two hours. A decreasing trend of green density however an improvement in sintered density was observed. Also the addition of silica sand nanoparticles with 20 wt.% increased the hardness up to 12.45 GPa and microstructures indicated the diffusion mechanism of silica sand nanoparticles into pore sites of the composites.
Effect of Conduction Pre-heating in Au-Al Thermosonic Wire Bonding  [PDF]
Gurbinder Singh, Othman Mamat
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2011, DOI: 10.4236/jsemat.2011.13018
Abstract: This paper presents the recent study by investigating the vital responses of wire bonding with the application of conduction pre-heating. It is observed through literature reviews that, the effect of pre-heating has not been completely explored to enable the successful application of pre-heating during wire bonding. The aim of wire bonding is to form quality and reliable solid-state bonds to interconnect metals such as gold wires to metalized pads deposited on silicon integrated circuits. Typically, there are 3 main wire bonding techniques applied in the industry; Thermo-compression, Ultrasonic and Thermosonic. This experiment utilizes the most common and widely used platform which is thermosonic bonding. This technique is explored with the application of conduction pre-heating along with heat on the bonding site, ultrasonic energy and force on an Au-Al system. Sixteen groups of bonding conditions which include eight hundred data points of shear strength at various temperature settings were compared to establish the relationship between bonding strength and the application of conduction pre-heating. The results of this study will clearly indicate the effects of applied conduction pre-heating towards bonding strength which may further produce a robust wire bonding system.
Adaptive Stream Multicast for Video in Heterogeneous Networks
Dilmurat Tursun,Wang Liejun
Information Technology Journal , 2009,
Abstract: This study first proposes a novel adaptive stream multicast for MPEG-4 FGS video to meet these challenges. Based on the fine-granularity property of MPEG-4 FGS video coding technology, the scheme tries to delivery multimedia multicast service over the heterogeneous networks in a similar way as that to transport water in pipelines, where the valves in pipelines adjust water flux to next pipeline. A new method of computing PSNR is also first advanced to evaluate the MPEG-4 FGS video transmission. Simulated results indicate that the scheme could dispose the heterogeneity of networks and end-systems freely, with permanent stability, flexible scalability and unprejudiced fairness and TCP-friendliness.
EVALUASI MANFAAT DAN BIAYA PENGURANGAN EMISI SERTA PENYERAPAN KARBON DIOKSIDA PADA LAHAN GAMBUT DI HTI PT. SBA WI
Mamat Rahmat
Bumi Lestari , 2010,
Abstract: Forest has an opponent function in climate change issue, as carbon sink and carbon source. Reducing emission from deforestation and forest degradation (REDD) is the mechanism to tackle green house gas emission from forest sector. The economic analysis of those projects in Indonesia has not conducted yet, moreover the benefit and cost analysis of REDD on forest management unit. The research was conducted in the unique site, at Industrial Forest Plantation PT. SBA WI, South Sumatera. Benefit and cost analysis and break-even cost analysis were conducted to evaluate project feasibility. The research result shows that forest management was not feasible if the role of the project aimed to product wood or reducing emission only which conducted in mutual. If the project aims to reach both roles together, it is very attractive. Break-even cost of reducing emission and carbon sequestration in PT. SBA WI Rp.29.000,- per ton CO2e equal to US$3,17. It was lower than the cost in Bolivia, Ghana, and Nepal and also cheaper than carbon price in voluntary market.
Isolation and Identification of Metal Resistance Green Alga
金属离子抗性衣藻品系的分离筛选及其鉴定

DONG Zhi-Fang,Hasanjan Abdulla,Abliz Ablimit,Tursun Mamat,Gopur Mijit,
董志芳
,艾山江·阿布都拉,阿布力孜·阿布力米提,图尔逊·买买提,吾甫尔·米吉提

植物科学学报 , 2010,
Abstract: A total of 62 green alga strains were isolated from the soils of Nanshan Mountain, Xinjiang. Used the blot method to characterize these metal resistance, the results indicated that XJU-3、XJU-28 and XJU-36 have resistance to 0. 1 mmol · L~(-1) Co~(2+) ;XJU-28 has resistance to 1 mmol·L~(-1) Zn~(2+) and Fe~(3+) , XJU-36 has resistance to 0. 05 mmol·L~(-1) Cu~(2+). Taxonomic evalua-tion of the three strains were investigated based on the morphology and the internal transcribed spacer (ITS) regions (including the 5. 8S). Based on morphological characteristics, the three strains were likely to Chlamydomonas. Phylogenetic reconstruction with the Neighbor-joining (NJ) method using sequences of ITS(including the 5. 8S) indicated that XJU-3 and XJU-28 are closed to Chlamydomonas zebra. XJU-36 is closed to Chlamydornonas petasua.
Traditional Treatment of Malaysian Bamboos: Resistance Towards White Rot Fungus and Durability in Service
Zaidon Ashaari,Nazri Mamat
Pakistan Journal of Biological Sciences , 2000,
Abstract: Deterioration of Malaysian bamboos against biodeterioration agents and their service life have not been widely explored. This paper reveals the effect of traditional treatment on the resistance of selected bamboos towards white rot fungus and their durability in service. Bamboo culms of Dendrocalamus asper (Buluh betong), Bambusa vulgaris var. Striata (Buluh kuning) and Gigantochloa wrayi (Buluh beti) were soaked in running water for 2 and 3 weeks. The untreated culm served as control for comparison. Each treatment group comprises 45 samples per species. The starch content of the bamboo was chemically analysed using UV-spectrophotometer. Higher starch content was found in untreated than the water-treated ones. The starch content reduced as the soaking period increases. The starch content for D. asper was 2.78% w/w, for G. wrayi was 2.28% and for B. vulgaris was 1.85%. After 3 weeks of soaking in water, the starch reduced to 0.7%, 0.93% and 0.73%, respectively. The weight loss of bamboo culms caused by white rot fungus (Pycnoporous sanguineus) and their service life were evaluated in accordance with ASTM Standards. The average weight loss for the untreated bamboo ranged from 13.2-15.9% and these values decreased as the soaking period increases Deterioration of bamboo caused by decay and termite can be seen as early as three months of exposure in the ground. Decay on water-treated bamboo was much slower than on untreated. But for termite attacks, there is no definite trend. Among the three species, G. wrayi sustained the longest service life when in contact with ground.
Process Parameters Optimization of Silica Sand Nanoparticles Production Using Low Speed Ball Milling Method
Zulkhairi Rizlan,Othman Mamat
Chinese Journal of Engineering , 2014, DOI: 10.1155/2014/802459
Abstract: Experiments are designed using Taguchi method to find the optimum parameters for silica sand nanoparticles production using low speed ball milling. Orthogonal array and signal-to-noise ratio are applied to study performance characteristics of machining parameters which are the ball to powder weight ratio, volume of milling jar, and rotation speed. Results obtained from signal-to-noise ratio analysis showed that ball to powder weight ratio is the most influential parameter. 1. Introduction Nanoparticles of silica sand have been researched progressively and produced due to the unique features as a result of size reduction. Silica sand nanoparticles have proved to be a very effective additive to polymers by improving durability, strength, and flexibility. Nanosilica is also used as an additive to improve strength and workability of self-compacting and high performance concretes. Nanosilica particles are widely produced by chemical processes. However, chemical synthesis of nanosilica produces high contamination in the final products. As the demand is increasing for higher nanosilica purity, contamination is expected at the minimum level. Other than chemical synthesis, other processes such as precipitation, vaporization at high temperature, sol-gel process, high speed vertical rotating mill, and planetary ball mill are among the most commonly used methods to produce silica sand nanoparticles. The objective of this research is to design a technique of transforming natural Tronoh silica sand to silica sand nanoparticles by using a combination of low speed ball milling and heating processes. It is expected that the technique will be able to produce high purity silica sand nanoparticles of less than 100?nm consistently. Taguchi method provides a simple, efficient, and systematic approach to determine the optimum parameters [1]. Compared to the factorial method, instead of testing all possible combinations of parameters available, Taguchi method provides a more simplified way to set up the combination of experiment parameters. The parameters tested in this paper are ball to powder weight ratio (BPR), volume of milling jar, and milling speed. 2. Parameters Identification There are a lot of parameters used in ball milling process. However, the parameters that have been tested most for optimization are the rotation speed and milling time. This indicates that these two parameters play an important role in determining the effectiveness of the milling. As supported by Simoes, ball to powder weight ratio is recognized as one of the most influential parameters, alongside
On Transmit Beamforming for MISO-OFDM Channels With Finite-Rate Feedback
Kritsada Mamat,Wiroonsak Santipach
Mathematics , 2014, DOI: 10.1109/TCOMM.2015.2475420
Abstract: With finite-rate feedback, we propose two feedback methods for transmit beamforming in a point-to-point MISO-OFDM channel. For the first method, a receiver with perfect channel information, quantizes and feeds back the optimal transmit beamforming vectors of a few selected subcarriers, which are equally spaced. Based on those quantized vectors, the transmitter applies either constant, linear, or higher-order interpolation with the remaining beamforming vectors. With constant interpolation, we derive the approximate sum achievable rate and the optimal cluster size that maximizes the approximate rate. For linear interpolation, we derive a closed-form expression for the phase rotation by utilizing the correlation between OFDM subcarriers. We also propose a higher-order interpolation that requires more than two quantized vectors to interpolate transmit beamformers, and is based on existing channel estimation methods. Numerical results show that interpolation with the optimized cluster size can perform significantly better than that with an arbitrary cluster size. For the second proposed method, a channel impulse response is quantized with a uniform scalar quantizer. With channel quantization, we also derive the approximate sum achievable rate. We show that switching between the two methods for different feedback-rate requirements can perform better than the existing schemes.
Tree-Structured Random Vector Quantization for Limited-Feedback Wireless Channels
Wiroonsak Santipach,Kritsada Mamat
Mathematics , 2011, DOI: 10.1109/TWC.2011.072511.101916
Abstract: We consider the quantization of a transmit beamforming vector in multiantenna channels and of a signature vector in code division multiple access (CDMA) systems. Assuming perfect channel knowledge, the receiver selects for a transmitter the vector that maximizes the performance from a random vector quantization (RVQ) codebook, which consists of independent isotropically distributed unit-norm vectors. The quantized vector is then relayed to the transmitter via a rate-limited feedback channel. The RVQ codebook requires an exhaustive search to locate the selected entry. To reduce the search complexity, we apply generalized Lloyd or $k$-dimensional (kd)-tree algorithms to organize RVQ entries into a tree. In examples shown, the search complexity of tree-structured (TS) RVQ can be a few orders of magnitude less than that of the unstructured RVQ for the same performance. We also derive the performance approximation for TS-RVQ in a large system limit, which predicts the performance of a moderate-size system very well.
Determination of Some Chemical Properties of Common Cattail (Typha latifolia L.)
Mehvail Nacaroglu,Ali Riza Demirkiran,Nihat Tursun
Journal of Animal and Veterinary Advances , 2012,
Abstract: This study was carried out to determine macro, micro and heavy metals in the root, stem and leaves of common cattail (Typha latifolia L.) between the years of 2005-2006. The study was conducted by collecting plant samples on monthly basis. Plant samples were collected from two different regions (Lakes A and B) in Kahramanmaras province of Turkey. The study was conducted under laboratory conditions. Among macro elements of the plant, potassium was mostly concentrated in the stem whereas sodium and calcium were mostly concentrated in the leaves. Magnesium was mostly concentrated in the root. Among the micro elements, zinc, iron and copper were mostly concentrated in the root whereas manganese was mostly concentrated in the leaves. Among heavy metals, nickel, lead and cadmium were mostly concentrated in the root.
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