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Journal of Forestry Research 2017年第1期28卷 1-13页

作者： M.M.Abdullah-Al-Mamun Kazi Mohammad Masum A.H.M.Raihan Sarker asyraf mansor Institute of Forestry and Environmental Sciences Chittagong University Department of Forestry and Environmental Science Shahjalal University of Science and Technology School of Biological Sciences Universiti Sains Malaysia

The ecosystem services provided by the Bangladesh Sundarbans contribute in various sectors especially to the livelihood of the surrounding peoples, but they are often overlooked in the valuation process. This study investigates the significance of ecosystem services on peoples＇ lives and how these services are affected by climate change and other factors. Here an economic valuation framework was used to list the ecosystem services provided by this mangrove forest. Direct uses included timber, gol- pata （Nypa fruticans）, honey, beeswax, fish, shrimp larvae and tourism. Indirect uses included carbon storage, protection from cyclones and tidal surges, breeding and nursery grounds for the aquatic species, and biodiversity conservation. This work also found that the ecosystem services were diminished by fresh water flow reduction, overharvesting, sea level rise, salinity increase, poaching, and climate change. In the present context and future scenario, sea level rise will be an important contributor to changes in ecosystem services. But because many factors impact sea level rise, the impact of climate change takes on less importance than many other causes of ecosystem service degradation in the Bangladesh Sundarbans.

关键词： Climate change Bangladesh Sundarbans Ecosystem service Life and livelihood - Mangrove

A multi-mechanistic approach to the oil recovery study of a family of amphiphilic polysaccharides

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Petroleum Research 2024年第2期9卷 238-249页

作者： Funsho Afolabi Syed MMahmood Lunech Mario Nur asyraf Md Akhir Bennett Tackie-Otoo Hamid Sharifigaliuk Center of Research in Enhanced Oil Recovery Universiti Teknologi PETRONASSeri IskandarMalaysia Center for Subsurface Imaging Universiti Teknologi PETRONASSeri IskandarMalaysia Research Institute of Petroleum Industry(RIPI) TehranIran

Chemical enhanced oil recovery(cEOR)remains one of the most potent tertiary recovery ***,it is expensive and rarely environmentally ***-based amphiphilic polymers have been suggested as an alternative to eradicating the challenges of conventional cEOR because of cost-effectiveness,and ***,few in-depth studies exist in the literature to investigate the prospects of these materials.A new family of amphiphilic polysaccharides was synthesized by hydrophobic modification of cellulose sulphate,and the EOR functionalities were *** novel biopolymers exhibited the ability to alter rock wetting *** terms of recovery,one of the variants of the synthesized bio amphiphilic polymer(D-I)was able to reduce residual oil saturation to 12%at harsh conditions of 60,000 ppm salinity at 75℃.Micromodel visual analysis revealed that the performance of the novel materials was due to the combination of mobility control,IFT lowering and emulsification,wettability alteration,and *** a performance commensurate to that of a commercial hydrophobically modified polymer,it can be said that the novel amphiphilic polysaccharides can stand as a viable cEOR agent for oilfield applications.

关键词： Bio-based polymers Amphiphilic polysaccharides EOR Cellulose sulphate Environmental sustainability

A Survey on Stock Market Manipulation Detectors Using Artificial Intelligence

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Computers, Materials & Continua 2023年第5期75卷 4395-4418页

作者： Mohd asyraf Zulkifley Ali Fayyaz Munir Mohd Edil Abd Sukor Muhammad Hakimi Mohd Shafiai Department of Electrical Electronic and Systems EngineeringUniversiti Kebangsaan MalaysiaBangi43600Malaysia Faculty of Management Virtual University of Pakistan54000LahorePunjabPakistan Department of Finance Faculty of Business and EconomicsUniversiti Malaya50603Kuala LumpurMalaysia Center of Sustainable and Inclusive Development Universiti Kebangsaan Malaysia43600SelangorMalaysia

A well-managed financial market of stocks,commodities,derivatives,and bonds is crucial to a country’s economic *** provides confidence to investors,which encourages the inflow of cash to ensure good market ***,there will always be a group of traders that aims to manipulate market pricing to negatively influence stock values in their *** illegal trading activities are surely prohibited according to the rules and regulations of every country’s *** is the role of regulators to detect and prevent any manipulation cases in order to provide a trading platform that is fair and ***,the complexity of manipulation cases has increased significantly,coupled with high trading volumes,which makes the manual observations of such cases by human operators no longer *** a result,many intelligent systems have been developed by researchers all over the world to automatically detect various types of manipulation ***,this review paper aims to comprehensively discuss the state-of-theart methods that have been developed to detect and recognize stock market manipulation *** also provides a concise definition of manipulation taxonomy,including manipulation types and categories,as well as some of the output of early experimental *** summary,this paper provides a thorough review of the automated methods for detecting stock market manipulation cases.

关键词： Artificial intelligence machine learning convolutional neural network recurrent neural network stock market manipulation

Apex Frame Spotting Using Attention Networks for Micro-Expression Recognition System

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Computers, Materials & Continua 2022年第12期73卷 5331-5348页

作者： Ng Lai Yee Mohd asyraf Zulkifley Adhi Harmoko Saputro Siti Raihanah Abdani Department of Electrical Electronic and Systems EngineeringUniversiti Kebangsaan MalaysiaBangi43600Malaysia Faculty of Mathematics and Natural Science Universitas IndonesiaDepok16424Indonesia Faculty of Humanities Management and ScienceUniversiti Putra Malaysia Bintulu CampusBintulu97008Malaysia

Micro-expression is manifested through subtle and brief facial movements that relay the genuine person’s hidden *** a sequence of videos,there is a frame that captures the maximum facial differences,which is called the apex ***,apex frame spotting is a crucial sub-module in a micro-expression recognition ***,this spotting task is very challenging due to the characteristics of micro-expression that occurs in a short duration with low-intensity muscle ***,most of the existing automated works face difficulties in differentiating micro-expressions from other facial ***,this paper presents a deep learning model with an attention mechanism to spot the micro-expression apex frame from optical flow *** attention mechanism is embedded into the model so that more weights can be allocated to the regions that manifest the facial movements with higher *** method proposed in this paper has been tested and verified on two spontaneous micro-expression databases,namely Spontaneous Micro-facial Movement(SAMM)and Chinese Academy of Sciences Micro-expression(CASME)II *** proposed system performance is evaluated by using the Mean Absolute Error(MAE)metric that measures the distance between the predicted apex frame and the ground truth *** best MAE of 14.90 was obtained when a combination of five convolutional layers,local response normalization,and attention mechanism is used to model the apex frame *** with limited datasets,the results have proven that the attention mechanism has better emphasized the regions where the facial movements likely to occur and hence,improves the spotting performance.

关键词： Deep learning convolutional neural networks emotion recognition

Green Lignosulphonate as co-surfactant for wettability alteration

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Petroleum Research 2020年第2期5卷 154-163页

作者： Zhe Qin Lim Nabilla Afzan Abdul Aziz Ahmad Kamal Idris Nur asyraf Md Akhir Center of Research of Enhanced Oil Recovery Universiti Teknologi PETRONAS32610Seri IskandarPerakMalaysia Universiti Teknologi Malaysia 81310SkudaiJohor BahruMalaysia

Surfactant flooding is one of the common tertiary method to recover remaining oil in the reservoir, byreducing the interfacial tension (IFT) between two immiscible fluids nevertheless, current surfactantforms emulsion and difficult to achieve ultra-low IFT between the water and oil without addition of cosurfactant. In this research, two types of anionic lignosulphonate-based surfactants, Sodium Lignosulphonate (SLS) and Calcium Lignosulphonate (CLS) are chosen as co-surfactant. The main surfactantused in this project is the common anionic surfactant, Sodium Dodecyl Sulfate (SDS) at a fixed concentration of 4 mmol/l. Each type of co-surfactant with different concentrations (0.5%, 1.0%, 1.5% and2.0 wt %) was mixed with 4 mmol/L of SDS at each test tube to create the surfactant solution. The result ofthe experiment showed that at 0.5 wt % for SLS and CLS surfactant solution, the contact angle of oil tosurface lowered down with a reduction of 6° and 7° respectively. This indicate that the system will bemore water-wet which the oil droplet will be less adhesive to the rock surface. In conclusion, by using theoptimum concentration of 0.5 wt % lignosulphonate as co-surfactant is able to alter the wettability ofrocks and it is recommended to test the biological-based co-surfactant at increasing temperature as analternative to enhance the surfactant flooding performance which improves the oil recovery.

关键词： Biosurfactant Co-surfactant Wettability Microemulsion Water-wet

Towards Biorefinery Production of Microalgal Biofuels and Bioproducts: Production of Acetic Acid from the Fermentation of <i>Chlorella</i>sp. and <i>Tetraselmis suecica</i>Hydrolysates

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Green and Sustainable Chemistry 2017年第2期7卷 152-171页

作者： Mohd asyraf Kassim Mohd Aziz Rashid Ronald Halim Bioprocess Technology Divisions School of Industrial Technology Universiti Sains Malaysia Pulau Pinang Malaysia Department of Chemical Engineering Monash University Victoria Australia Crop and Soil Science Research Centre (SS) Malaysian Agriculture Research and Development Institute (MARDI) Serdang Malaysia Department of Chemical and Biomolecular Engineering The University of Melbourne Victoria Australia

Successful commercialization of microalgal bio-industry requires the design of an integrated microalgal biorefinery system that facilitates the co-production of biofuels, high-value products and industrial chemicals from the biomass. In this study, we investigated the use of sugar hydrolysate obtained from enzymatic saccharification of microalgal biomass (Chlorella sp. and T. suecica) as fermentation feedstock to produce industrially important chemicals, in particular acetic acid and butyric acid. By using hydrolysate with low sugar content as substrate for the anaerobic fermentation (1.5 - 2.4 g/L), we were able to prevent the bacterium C. saccharoperbutylacetonicum from activating its solventogenesis pathway. As a result, the fermentation process generated a product stream that was dominated by organic acids (acetic acid and butyric acid) rather than solvents (butanol, ethanol and acetone). Acetic acid constituted up to 92 wt% of Chlorella’s fermentation products and 80 wt% of T. suecica’s fermentation products. For T. suecica, the fermentation consumed almost all of the sugar available in the hydrolysate (up to 92% of initial sugar) and produced a reasonable yield of fermentation products (0.08 g fermentation products/g sugar). The Gompertz equation was successfully used to predict the formation kinetics of acetic acid and other fermentation products across both species. The results in the study demonstrate the production of industrially important chemicals, such as acetic acid and butyric acid, from the fermentation of microalgal sugar. The process described in the study can potentially be used as a value-adding step to generate biochemicals from cell debris in an integrated microalgal biorefinery system.

关键词： Microalgal Cultivation Acetone-Butanol-Ethanol Fermentation Acetic Acid Microalgal Biorefinery Gompertz Model Biochemical Biofuels

新型含硅型沸石肥料对水稻采收质量和产量的效益

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农业科学 2016年第3期6卷 79-86页

作者：吴展才吴思节 Muhammad asyraf AbdulAziz Muhamad IzzuddinKhairuddin 陈宥维绿丰农业私人有限公司吉隆坡台湾大学园艺学系台湾台北

水稻为全球最重要的粮食作物,中国也为全球最大的消费国和生产国。本研究测试一种新型含硅的水稻专用配方,分别于马来西亚和台湾地区测试水稻产量和质量。在马来西亚的方面,用量从化学肥料的用量从每公顷810公斤减至本肥料的150公斤,传... 详细信息

水稻为全球最重要的粮食作物,中国也为全球最大的消费国和生产国。本研究测试一种新型含硅的水稻专用配方,分别于马来西亚和台湾地区测试水稻产量和质量。在马来西亚的方面,用量从化学肥料的用量从每公顷810公斤减至本肥料的150公斤,传统化肥产量为6100公斤/公顷。使用绿丰肥料每公顷收成可高达8000公斤。增产幅度33%。台湾方面,在屏东的九如乡和崁顶乡使用绿丰®水稻肥的增幅分别达到16.7%和15.7%。分析去壳后糙米质量,脱壳后千粒重,绿丰®水稻肥处理者较传统复合肥高出5.2%~7.8%。总淀粉含量方面,绿丰®水稻肥比对照组高出6.5%,稻谷水分和矿物质各处理间差异不大。说明了对比大幅减量的绿丰®水稻肥所生产出来的稻米质量,在水分和灰分的表现和传统肥料者无大差异,在总淀粉含量更高,直接说明了水稻对此肥料的利用率更佳,此配方适用于热带和亚热带水稻环境,十分合宜于中国境内水稻区推广使用。

关键词：含硅型肥料水稻千粒重增产