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A review on the mechanisms of low salinity water/surfactant/nanoparticles and the potential synergistic application for c-EOR

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Petroleum Research 2023年第3期8卷 324-337页

作者： Stanley Sim sze lim Henry Elochukwu Jobrun Nandong Ziad Bennour Mohamed Ali Hamid Chemical and Energy Department Faculty of Engineering and ScienceCurtin University MalaysiaMalaysia School of Engineering and Physical Sciences Heriot Watt UniversityMalaysia

Chemical enhanced oil recovery(c-EOR)is a conventional and promising strategy to recover oil from reservoir techniques such as low salinity water flooding(LSWF),surfactant flooding,alkaline flooding,polymers flooding,and nanofluid *** use of various types of chemical materials for c-EOR method has recently attracted the attention of the oil and gas *** primary objective of this review work is to explore the synergy of low salinity water/surfactant/nanoparticle flooding for effective c-EOR method and investigate the mechanism behind these *** advantages of combining these chemical materials for c-EOR methods is also *** and limitations of this synergy and their economic feasibility for additional oil recovery and potential return on investment are *** have been successfully used in various applications in several industries and have also shown good application for EOR in terms of wettability *** contributes to wettability alteration,while surfactant contributes to wettability alteration and interfacial tension(IFT)***,fines migration caused by LSWF and nanoparticle agglomeration can cause formation damage,while excessive surfactant adsorption can lead to cost overrun on surfactant *** the characteristics of reservoir formation mineralogy and appropriate nanoparticle type,size,and concentration can be used to resolve this *** synergy of LSWF and nanoparticles in alkaline medium can serve as sacrificial agent to reduce excessive surfactant ***,the appropriate synergistic formulation of LSFW/surfactant/nanoparticle can improve additional oil recovery and support return on investment for c-EOR projects.

关键词： Surfactant Low salinity water Nanoparticles Nanofluid Enhanced oil recovery

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Relationships between sagittal otolith size and body size of Terapon jarbua (Teleostei, Terapontidae) in Malaysian waters

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Journal of Oceanology and limnology 2021年第1期39卷 372-381页

作者： Shyama Sundari Devi CHANTHRAN Phaik Eem lim sze-Wan POONG Jianguo DU Kar-Hoe LOH Institute of Ocean and Earth Sciences University of MalayaKuala Lumpur 50603Malaysia Institute for Advanced Studies University of MalayaKuala Lumpur 50603Malaysia Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Fujian Provincial Station for Field Observation and Research of Island and Coastal Zone in Zhangzhou Xiamen 361005China Fujian Provincial Key Laboratory of Marine Ecological Conservation and Restoration Xiamen 361005China

Length-weight relationship provides basic information of a fi sh’s condition while the morphometric data of otolith has been traditionally used to determine the range of fi sh sizes for various *** length-weight relationship of Terapon jarbua(Forskål,1775)was examined from 165 specimens,while 132 specimens were used in sagittal otolith biometry *** specimens were obtained from various locations in Malaysia including Pahang,Selangor,Sarawak,and *** total length of fi sh ranged 12.5–32.5 cm,while the total weight ranged 26.28–444.30 *** otolith length ranged 0.423–1.070 cm,and the otolith weight was 0.0103–0.1572 *** specimens displayed a mixture of positive and negative allometry growth as indicated by fl uctuating b values between 2.74 and *** overall coeffi cient of determination(R 2)between fi sh length and weight was 0.9729,which implies a strong *** regressions between the fi sh length and otolith dimensions were highly signifi cant(P<0.001).The otolith dimensions found to be most closely related to the fi sh total length was the otolith *** was supported by the regression model showing a high R 2 value of 86.57%.The aspect ratio of otolith was 1.80±0.14(mean±SD).Results confi rm that the otolith growth refl ects the somatic growth of *** length-weight relationship explained the growth conditions of the fi shes in each location while the overall b value of 2.91 indicates that the condition of *** grown in Malaysian waters during the study period was generally in good *** study contributed to the database on the morphometric data of otolith of *** as well as the fi rst report on fi sh length-weight relationship for *** in Malaysia.

关键词： aspect ratio otolith length-weight relationship grunter

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Drying kinetics of technical specified rubber

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Information Processing in Agriculture 2015年第1期2卷 64-71页

作者： Mei Xiang Ng Thing Chai Tham sze Pheng Ong Chung lim Law University of Nottingham Malaysia Campus Jalan Broga43500 SemenyihSelangorMalaysia

This paper reports the study of crumb rubber drying in different experimental *** is important to understand the characteristics of crumb rubber drying in order to formulate a better drying strategy that could give higher energy *** experiments were carried out with constant heat at maximum 100℃ and a stainless steel container was used to hold the sample of crumb rubber under *** surface temperature profile of the rubber was investigated using two types of drying methods,normal hot air drying and vacuum *** was found that when the sample was dried,external surface temperature for drying with hot air dryer was higher than vacuum *** results showed the evolution of temperature profile was not in good agreement with the prediction which revealed that there was no temperature gradient within the drying *** energy consumption for vacuum drying was higher compared to hot air drying,where there was a difference of 0.7079 MJ/kg H2O evaporated for drying temperature at 100℃.The best fit model generated from the experimental data was the modified Henderson and Pabis model and the highest effective diffusivity obtained was 5.243×10^-9m^2/s heating by vacuum oven at 90℃ under zero atmospheric pressure.

关键词： Crumb rubber Drying characteristic Mathematical modeling

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Dual ultra-wideband(UWB)radar-based sleep posture recognition system:Towards ubiquitous sleep monitoring

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再生工程(英文) 2023年第1期4卷 36-43页

作者： Derek Ka-Hei Lai Li-Wen Zha Tommy Yau-Nam Leung Andy Yiu-Chau Tam Bryan Pak-Hei So Hyo-Jung lim Daphne sze Ki Cheung Duo Wai-Chi Wong James Chung-Wai Cheung Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Department of Bioengineering Imperial CollegeLondon SW72AZUnited Kingdom Research Institute of Smart Ageing The Hong Kong Polytechnic UniversityHong KongChina School of Nursing The Hong Kong Polytechnic UniversityHong KongChina

Sleep posture monitoring is an essential assessment for obstructive sleep apnea(OSA)*** objective of this study is to develop a machine learning-based sleep posture recognition system using a dual ultra-wideband radar *** collected radiofrequency data from two radars positioned over and at the side of the bed for 16 patients performing four sleep postures(supine,left and right lateral,and prone).We proposed and evaluated deep learning approaches that streamlined feature extraction and classification,and the traditional machine learning approaches that involved different combinations of feature extractors and *** results showed that the dual radar system performed better than either single *** statistical features with random forest classifier yielded the best accuracy(0.887),which could be further improved via an ablation study(0.938).Deep learning approach using transformer yielded accuracy of 0.713.

关键词： Obstructive sleep apnea Deep learning Sleep monitoring Feature extraction Ablation study

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Growth and photosynthesis of Chlorella strains from polar,temperate and tropical freshwater environments under temperature stress

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Journal of Oceanology and limnology 2018年第4期36卷 1266-1279页

作者： Kok-Keong LEE Phaik-Eem lim sze-Wan POONG Chiew-Yen WONG Siew-Moi PHANG John BEARDALL Institute of Ocean and Earth Sciences University of Malaya Institute of Graduate Studies University of Malaya School of Health Sciences International Medical University National Antarctic Research Centre University of Malaya Institute of Biological Sciences University of Malaya School of Biological Sciences Monash University

Elevated temperatures as a consequence of global warming have significant impacts on the adaptation and survival of microalgae which are important primary producers in many ecosystems. The impact of temperature on the photosynthesis of microalgae is of great interest as the primary production of algal biomass is strongly dependent on the photosynthetic rates in a dynamic environment. Here, we examine the effects of elevated temperature on Chlorella strains originating from different latitudes, namely Antarctic, Arctic, temperate and tropical regions. Chlorophyll fluorescence was used to assess the photosynthetic responses of the microalgae. Rapid light curves(RLCs) and maximum quantum yield( F_v/F_m) were recorded. The results showed that Chlorella originating from different latitudes portrayed different growth trends and photosynthetic performance. The Chlorella genus is eurythermal, with a broad temperature tolerance range, but with strain-specific characteristics. However, there was a large overlap between the tolerance range of the four strains due to their "eurythermal adaptivity". Changes in the photosynthetic parameters indicated temperature stress. The ability of the four strains to reactivate photosynthesis after inhibition of photosynthesis under high temperatures was also studied. The Chlorella strains were shown to recover in terms of photosynthesis and growth(measured as Chl a) when they were returned to their ambient temperatures. Polar strains showed faster recovery in their optimal temperature compared to that under the ambient temperature from which they were isolated.

关键词：海藻全球变暖环境保护环境管理

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Quantification of Carpaine and Antioxidant Properties of Extracts from Carica Papaya Plant Leaves and Stalks

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Journal of Bioresources and Bioproducts 2021年第4期6卷 350-358页

作者： Jing Ying Yap Ching Lik Hii sze Pheng Ong Kuan Hon lim Faridah Abas Kar Yong Pin Future Food Malaysia Department of Chemical and Environmental EngineeringFaculty of Science and EngineeringUniversity of Nottingham MalaysiaJalan Broga43500 SemenyihSelangor Darul EhsanMalaysia School of Pharmacy Faculty of Science and Engineering University of Nottingham MalaysiaJalan Broga43500 SemenyihSelangor Darul EhsanMalaysia Department of Food Science Universiti Putra Malaysia43400 SerdangSelangor Darul EhsanMalaysia Forest Research Institute Malaysia 52109 Kuala LumpurSelangor Darul EhsanMalaysia

Significance increase in dengue cases have been recorded worldwide every year and South East Asian countries have been badly ***,antiviral drug to treat dengue is still not available but papaya leaves extract(PLE)have been successfully used in treating dengue *** in PLE is the major active compounds that contributes to the anti-thrombocytopenic activity(raising platelet count in patient’s blood).The PLE also contains polyphenols that contribute to antioxidant *** were carried out to extract and quantify carpaine from young leaves,old leaves and stalks of papaya *** crystalline powders were successfully purified and confirmed by ^(1)H and ^(13)C NMR(Nuclear Magnetic Resonance).Young papaya leaves recorded significantly higher amount of carpaine(P<0.05)as compared with old leaves and *** treatment showed significant effect(P<0.05)on the amount of carpaine extracted from the young and old leaves and blended young leaves showed significantly much higher amount of carpaine as compared with the unblended samples(P<0.05).In terms of total polyphenols content(TPC),young leaves(both unblended and blended samples)contained significantly higher amount of TPC(P<0.05)followed by the old leaves and *** also showed relationship between the TPC and the 1,1-diphenyl-2-picrylhydrazyl(DPPH)assay scavenging activities namely IC_(50)(R^(2)=0.9743)and acid equivalent antioxidant capacity(AEAC)(R^(2)=0.9581).Both young and old leaves also showed significantly higher(P<0.05)DPPH scavenging activities as compared with the stalks in both unblended and blended *** papaya leaves were recommended as source of material to extract carpaine for future development of drug in dengue treatment.

关键词： Antioxidants Carica papaya Carpaine Dengue Total polyphenols

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Women's experiences of formula feeding their infants:an interpretative phenomenological study

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Frontiers of Nursing 2018年第1期5卷 49-59页

作者： Kin Yan sze Zenobia Chung Yee Chan Vico Chung lim Chiang School of Nursing The Hong Kong Polytechnic University

Objective: This study aimed to explore the experiences of women in the process of formula feeding their infants. The World Health Organization has emphasized the importance of breastfeeding for infant health. After decades of breastfeeding promotions,breastfeeding rates in Hong Kong have been rising consistently; however, the low continuation rate is alarming. This study explores women's experiences with formula feeding their infants, including factors affecting their decision to do ***: A qualitative approach using an interpretative phenomenological analysis(IPA) was adopted as the study design. Data were collected from 2014 to 2015 through individual in-depth unstructured interviews with 16 women, conducted between 3 and 12 months after the birth of their infant. Data were analyzed using ***: Three main themes emerged as follows:(1) self-struggle, with the subthemes of feeling like a milk cow and feeling trapped;(2) family conflict, with the subtheme of sharing the spotlight; and(3) interpersonal tensions, with the subthemes of embarrassment,staring, and innocence. Many mothers suffered various stressors and frustrations during breastfeeding. These findings suggest a number of pertinent areas that need to be considered in preparing an infant feeding ***: The findings of this study reinforce our knowledge of women's struggles with multiple sources of pressure, such as career demands, childcare demands, and family life after giving birth. All mothers should be given assistance in making informed decisions about the optimal approach to feeding their babies given their individual situation and be provided with support to pursue their chosen feeding method.

关键词： formula feeding infant feeding breastfeeding feeding decision experience Qualitative interpretative phenom enological analysis women education support nurse nursing

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Impacts of different drying strategies on drying characteristics,the retention of bio-active ingredient and colour changes of dried Roselle

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Chinese Journal of Chemical Engineering 2018年第2期26卷 303-316页

作者： Thing Chai Tham Mei Xiang Ng Shu Hui Gan Lee Suan Chua Ramlan Aziz Luqman Chuah Abdullah sze Pheng Ong Nyuk Ling Chin Chung lim Law Department of Chemical Engineering The University of Nottingham Malaysia CampusJaian Broga43500 SemenyihSelangor D.E.Malaysia Institute of Bioproduct Development Universiti Teknologi MalaysiaUTMJohor Bahru81310 SkudaiMalaysia Department of Chemical and Environmental Engineering Universiti Putra Malaysia UPM43400 SerdangSelangorMalaysia Department of Process and Food Engineering Universiti Putra Malaysia UPM43400 SerdangSelangorMalaysia

The drying kinetics of Roselle(Hibiscus sabdariffa L) of variety Terengganu(UMKL-1) and the quality attribution of Roselle were studied. The experiments were conducted using four different drying methods, including solar greenhouse drying(SD), solar greenhouse with intermittent heat pump drying(SIHP), hot air drying(HA) and heat pump drying(HP). Among the four drying methods, HP achieved the highest drying rate at a range from0.054 g H_2 O·(g DM)^(-1) ·min^(-1) to 0.212 g H_2 O·(g DM)^(-1)·min^(-1) while SD had the lowest drying rate, measured at 0.042 g H_2 O·(g DM)^(-1)·min^(-1).The analysis on colour kinetics revealed that there is no significant colour loss(p > 0.05) observed from HP's dried Roselle. Greater amount of flavonoid compounds i.e. protocatechuic acid was found in SD and SIHP dried finished product whereas HP's dried Roselle contains higher percentage of catechin as compared to other drying methods.

关键词：颜色变化特征成分简历色动力学热空气 HP DM

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系统级封装(SiP)组装技术与锡膏特性

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电子工业专用设备 2021年第2期50卷 67-70页

作者： sze Pei lim Kenneth Thum Andy Mackie David Hu 铟泰公司美国纽约州克林顿13323 铟泰公司江苏苏州215126

由于物联网“智慧”设备的快速发展,业界对能够在更小的封装内实现更多功能的系统级封装(SiP)器件的需求高涨[1],这种需求将微型化趋势推向了更高的层次:使用更小的元件和更高的密度来进行组装。无源元件尺寸已从01005(0.4 mm×0.2 mm)... 详细信息

由于物联网“智慧”设备的快速发展,业界对能够在更小的封装内实现更多功能的系统级封装(SiP)器件的需求高涨[1],这种需求将微型化趋势推向了更高的层次:使用更小的元件和更高的密度来进行组装。无源元件尺寸已从01005(0.4 mm×0.2 mm)缩小到008004(0.25 mm×0.125 mm),细间距锡膏印刷对SiP的组装来说变得越来越有挑战性。对使用不同助焊剂和不同颗粒尺寸锡粉的3种锡膏样本进行了研究;同时通过比较使用平台和真空的板支撑系统,试验了是否可以单独使用平台支撑来获得一致性较好的印刷工艺;并比较了激光切割和电铸钢网在不同开孔尺寸下的印刷结果。

关键词：系统级封装(SiP) 锡膏锡粉微型化

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系统级封装(SiP)组装技术与锡膏特性(续)

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电子工业专用设备 2021年第3期50卷 65-69页

作者： sze Pei lim Kenneth Thum Andy Mackie David Hu 铟泰公司美国纽约州克林顿13323 铟泰公司江苏苏州215126

4结果和讨论4.1焊盘间的桥接结果比较表明,使用不同的治具配置有明显的区别。使用平台治具作为板支撑的激光切割钢网在80μm间隙的情况下未发现桥接。使用真空支撑时,激光切割钢网在50μm间隙的情况下也未发现桥接。这说明使用真空支撑... 详细信息

4结果和讨论4.1焊盘间的桥接结果比较表明,使用不同的治具配置有明显的区别。使用平台治具作为板支撑的激光切割钢网在80μm间隙的情况下未发现桥接。使用真空支撑时,激光切割钢网在50μm间隙的情况下也未发现桥接。这说明使用真空支撑在印刷时的钢网和电路板间间隙更小,支撑性能更好。图5显示了其在125μm×150μm焊盘(1∶1)和50μm焊盘间隙条件下的印刷效果。

关键词：组装技术激光切割桥接印刷效果焊盘锡膏钢网治具

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