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Heavy metal contents in soil of major towns in the east coast of Peninsular Malaysia

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Chinese Journal Of Geochemistry 2006年第B8期25卷 56-56页

作者： Seng Chee Poh Norhaxati Mohd Tahir Hafiza Mohamed Zuki Mohd Izwadi Musa khai hock ng Noor Azhar Mohamed Shazili Department of Chemistry Science Faculty of Science and Technology KUSTEM Institute of Oceanography KUSTEM

Characterization of Baram and Tanjung sands as potential proppants

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Energy Geoscience 2021年第3期2卷 175-180页

作者： Henry Elochukwu Kenneth Kho khai Kiat Department of Petroleum Engineering Curtin UniversityCDT25098009MiriSarawakMalaysia

Baram and Tanjung sands were evaluated for potential use as *** was conducted on Baram and Tanjung sands following ISO and ASTM recommended *** showed that Baram and Tanjung sand mineralogy is predominantly quartz with presence of metal *** descriptors of both sands for sphericity and roundness were above *** sand was retained by 20/40 mesh size with mean size of 448.2 mm,bulk density of 1.32 g/cc,acid solubility of 1.5%and crush resistance of 4000 *** Tanjung sand was retained by 30/50 mesh size with mean size of 383.2 mm,bulk density of 1.30 g/cc,acid solubility of 1.20%and crush resistance of 8000 *** indicates that Baram sand has larger grain size that supports high permeability at low closure stress,making this sand suitable for shallow depth hydraulic fracturing operations,whereas Tanjung sand is more suitable for deeper domains with high closure *** results and economic comparison with commercial frac sand and other proppant types support using Baram and Tanjung sands as potential proppants.

关键词： Baram sand Tanjung sand Crush resistance Proppant Hydraulic fracturing

CRL： Efficient Concurrent Regeneration Codes with Local Reconstruction in Geo-Distributed Storage Systems

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Journal of Computer Science & Technology 2018年第6期33卷 1140-1151页

作者： Quan-Qing Xu Wei-Ya Xi khai Leong Yong Chao Jin Institute of High Performance Computing Agency for Science Technology and Research Singapore 138632 Singapore Data Storage Institute Agency for Science Technology and Research Singapore 138632 Singapore Institute for Infocomm Research Agency for Science Technology and Research Singapore 138632 Singapore

As a typical erasure coding choice, Reed-Solomon （RS） codes have such high repair cost that there is a penaltyfor high reliability and storage efficiency, thereby they are not suitable in geo-distributed storage systems. We present anovel family of concurrent regeneration codes with local reconstruction （CRL） in this paper. The CRL codes enjoy threebenefits. Firstly, they are able to minimize the network bandwidth for node repair. Secondly, they can reduce the numberof accessed nodes by calculating parities from a subset of data chunks and using an implied parity chunk. Thirdly, they arefaster than existing erasure codes for reconstruction in geo-distributed storage systems. In addition, we demonstrate howthe CRL codes overcome the limitations of the Reed-Solomon codes. We also illustrate analytically that they are excellent inthe trade-off between chunk locality and minimum distance. Furthermore, we present theoretical analysis including latencyanalysis and reliability analysis for the CRL codes. By using quantity comparisons, we prove that CRL（6, 2, 2） is only0.657x of Azure LRC（6, 2, 2）, where there are six data chunks, two global parities, and two local parities, and CRL（10,4, 2） is only 0.656x of HDFS-Xorbas（10, 4, 2）, where there are 10 data chunks, four local parities, and two global paritiesrespectively, in terms of data reconstruction times. Our experimental results show the performance of CRL by conductingperformance evaluations in both two kinds of environments： 1） it is at least 57.25% and 66.85% more than its competitorsin terms of encoding and decoding throughputs in memory, and 2） it has at least 1.46x and 1.21x higher encoding anddecoding throughputs than its competitors in JBOD （Just a Bunch Of Disks）. We also illustrate that CRL is 28.79% and30.19% more than LRC on encoding and decoding throughputs in a geo-distributed environment.

关键词： concurrent regeneration code local reconstruction geo-distributed storage system

On recommendation-aware content caching for 6G:An artificial intelligence and optimization empowered paradigm

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Digital Communications and Networks 2020年第3期6卷 304-311页

作者： Yaru Fu khai nguyen Doan Tony Q.S.Quek The School of Science and Technology The Open University of Hong Kong(OUHK)KowloonHong KongChina Information Systems Technology and Design Singapore University of Technology and Design487372Singapore

Recommendation-aware Content Caching(RCC)at the edge enables a significant reduction of the network latency and the backhaul load,thereby invigorating ubiquitous latency-sensitive innovative ***,the effectiveness of RCC strategies is highly dependent on explicit information as regards subscribers’content request patterns,the sophisticated caching placement policy,and the personalized recommendation *** this article,we investigate how the potentials of Artificial Intelligence(AI)and optimization techniques can be harnessed to address those core issues and facilitate the full implementation of RCC for the upcoming intelligent 6G *** this end,we first elaborate on the hierarchical RCC network ***,the devised AI and optimization empowered paradigm is introduced,whereas AI and optimization techniques are leveraged to predict the users’content preferences in real-time situations with the assistance of their historical behavior data and determine the cache pushing and recommendation decision,*** extensive case studies,we validate the effectiveness of AI-based predictors in estimating users’content preference and the superiority of optimized RCC policies over the conventional *** last,we shed light on the opportunities and challenges in the future.

关键词： Artificial intelligence Content caching Optimization techniques Recommendation 6G

A review of remote sensing applications for oil palm studies

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Geo-Spatial Information Science 2017年第2期20卷 184-200页

作者： khai Loong Chong Kasturi Devi Kanniah Christine Pohl Kian Pang Tan Faculty of Geoinformation and Real Estate Universiti Teknologi MalaysiaJohor BahruMalaysia Centre for Environmental Sustainability and Water Security(IPASA) Research Institute for Sustainable Environment(RISE)Universiti Teknologi MalaysiaJohor BahruMalaysia Institute of Computer Science University of OsnabrueckOsnabrueckGermany

Oil palm becomes an increasingly important source of vegetable oil for its production exceeds soybean,sunflower,and *** growth of the oil palm industry causes degradation to the environment,especially when the expansion of plantations goes *** sensing is a useful tool to monitor the development of oil palm *** order to promote the use of remote sensing in the oil palm industry to support their drive for sustainability,this paper provides an understanding toward the use of remote sensing and its applications to oil palm plantation *** addition,the existing knowledge gaps are identified and recommendations for further research are given.

关键词： Oil palm remote sensing monitoring agriculture mapping sustainability

Fabrication and Characterization of Superhydrophobic and Highly Oleophobic Silk Fabrics

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Fabrication and Characterization of Superhydrophobic and Hig...

作者： DO khai LY 浙江理工大学

学位级别：硕士

Superhydrophobicity and oleophobicity which have been discovered from natural world are definitely anticipated to be beneficial for a large number of practical applications Imitation of nature has been the most appreciable way to develop the structural properties for coating fabrication,due to millions of creatures including botanical,insect and zoological species,which have the ability to be resistant from water and low surface tension *** robust superhydrophobic and oleophobic coatings refer to the surface modification of optical materials in order to fabricate the surface roughness and reduce the low surface energy,that lead to water and oil repellent properties with several practical and industrial ***,many publications have presented the preparation strategies of superhydrophobic and oleophobic surface for textile ***,there is a lack of ideal coating approach for superhydrophobic and oleophobic silk ***,these techniques have the disadvantage of complicated procedure,time consuming,use of toxic chemicals,high cost for experiments and low *** this master thesis,simple approaches to prepare fluorine-free superhydrophobic coating and highly hydrophobic and oleophobic coating for silk textile fabrics based on SiO2 nanoparticles and low surface energy agents are ***2 nanoparticles has naturally hydrophilic features and were functionalized by fluorine-free and/or fluorinated *** to experiment works,we successfully prepared the superhydrophobic silk fabric with water contact angle（WCA）of 152.0° and water sliding angle（WSA）of 4.2°,and highly hydrophobic silk fabric with WCA of 149.5°,which is extremely near to superhydrophobic ***,by the introduction of fluorinated silane,oleophobicity has been developed and oil contact angle（OCA）of modified silk fabric reached 132.0°.Effects of different particle sizes of SiO2 nanoparticles,concentration of chemicals in modificatio

关键词： Superhydrophobic Oleophobic Silkfabric Silicananoparticles Laundering durability

巴基斯坦新特提斯构造–岩浆演化与重要金属成矿作用

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西北地质 2024年第3期57卷 154-176页

作者：洪俊张辉善吕鹏瑞 Tahseenullah Khan Yasir Shaheen Khalil 王志华张海迪自然资源部岩浆作用成矿与找矿重点实验室中国地质调查局西安地质调查中心陕西西安710119 巴基斯坦巴利亚大学地球科学与环境学院巴基斯坦伊斯兰堡44000 巴基斯坦地质调查局巴基斯坦伊斯兰堡44000 长安大学资源学院陕西西安710054

巴基斯坦在大地构造位置上处于印度、欧亚和阿拉伯三大板块的汇聚带,正同时发生着大陆碰撞和大洋俯冲作用,是研究地球系统深部圈层相互作用与成矿效应的绝佳天然实验室。但是,目前对于巴基斯坦构造演化与成矿作用的研究还不系统,对于巴... 详细信息

巴基斯坦在大地构造位置上处于印度、欧亚和阿拉伯三大板块的汇聚带,正同时发生着大陆碰撞和大洋俯冲作用,是研究地球系统深部圈层相互作用与成矿效应的绝佳天然实验室。但是,目前对于巴基斯坦构造演化与成矿作用的研究还不系统,对于巴基斯坦的大型–超大型矿床形成的背景和机制仍不清楚。笔者针对巴基斯坦不同类型的优势矿种开展了深入解剖和对比研究,系统梳理最新研究进展,围绕巴基斯坦新特提斯构造–岩浆演化与成矿作用响应的关键科学问题,分析铜矿、铬铁矿、铅锌矿以及碳酸岩有关的稀土矿床等重要金属成矿类型形成的构造环境以及与区域重大地质事件的耦合关系,总结巴基斯坦区域成矿规律,为资源潜力分析和境内外找矿勘查提供依据。

关键词：新特提斯岩浆作用铬铁矿斑岩铜矿碳酸岩巴基斯坦

Performance Comparison of Chemically Modified Sugarcane Bagasse for Removing Cd(II) in Water Environment

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Journal of Renewable Materials 2019年第5期7卷 415-428页

作者： Manh khai nguyen Minh Trang Hoang Thi Thuy Pham Bart Van der Bruggen Falculty of Environmental Science VNU University of Science334 Nguyen TraiHanoiVietnam Laboratory for Process Engineering for Sustainable Systems Department of Chemical EngineeringKU LeuvenBelgiumCelestijnenlaan 200F3001 LeuvenBelgium

This paper evaluates the adsorption capacity of chemically sugarcane bagasses with sodium hydroxide(SHS),citric acid(CAS),tartaric acid(TAS)and unmodified sugarcane bagasse(SB)for cadmium adsorption in water *** results prove adsorption capacity for Cd(II)increases after chemical modification and the adsorption fits perfectly with the Langmuir *** had the highest maximum adsorption capacity of 45.45 mg/g followed by TAS with 38.46 mg/g and SHS with 29.41 at optimum pH 5.0 and 120 minutes equilibrium time while 1 g SB removed 18.8 mg Cd(II)in the same *** kinetics study of the process followed a pseudo-secondorder rate expression,that indicated a strong interaction between the biosorbents and *** sugarcane bagasse and modified sugarcane bagasse were characterized by scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FTIR)*** chemical modification was confirmed by the presence of carboxyl and esters groups created at 1,738 *** estimation of acid groups in modified materials shows the enhancement of this group after *** the other hand,desorption studies showed the high leaching of cadmium ion from the biosorbent leading to the efficient reutilization of materials.

关键词： Cadmium chemical modification citric acid sugarcane bagasse

Adaptive and scalable load balancing for metadata server cluster in cloud-scale file systems

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Frontiers of Computer Science 2015年第6期9卷 904-918页

作者： Quanqing xu Rajesh Vellore ARUMUGAM khai Leong YOng Yonggang WEN Yew-Soon Ong Weiya XI Data Storage Institute Agency for Science Technology and Research Singapore 138632 Singapore School of Computer Engineering Nanyang Technological University Singapore 639798 Singapore

Big data is an emerging term in the storage indus- try, and it is data analytics on big storage, i.e., Cloud-scale storage. In Cloud-scale （or EB-scale） file systems, load bal- ancing in request workloads across a metadata server cluster is critical for avoiding performance bottlenecks and improv- ing quality of services. Many good approaches have been pro- posed for load balancing in distributed file systems. Some of them pay attention to global namespace balancing, making metadata distribution across metadata servers as uniform as possible. However, they do not work well in skew request dis- tributions, which impair load balancing but simultaneously increase the effectiveness of caching and replication, in this paper, we propose Cloud Cache （C2）, an adaptive and scal- able load balancing scheme for metadata server cluster in EB-scale file systems. It combines adaptive cache diffusion and replication scheme to cope with the request load balanc- ing problem, and it can be integrated into existing distributed metadata management approaches to efficiently improve their load balancing performance. C2 runs as follows： 1） to run adaptive cache diffusion first, if a node is overloaded, load- shedding will be used; otherwise, load-stealing will be used; and 2） to run adaptive replication scheme second, if there is a very popular metadata item （or at least two items） causing a node be overloaded, adaptive replication scheme will be used,in which the very popular item is not split into several nodes using adaptive cache diffusion because of its knapsack prop- erty. By conducting performance evaluation in trace-driven simulations, experimental results demonstrate the efficiency and scalability of C2.

关键词： metadata management load balancing adaptivecache diffusion adaptive replication cloud-scale file systems