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The effect of nanosilica sizes in the presence of nonionic TX100 surfactant on CO_(2)foam flooding

Petroleum Research 2022年第1期7卷 62-76页

作者： Suriatie Mat Yusuf Radzuan Junin Mohd Akhmal Muhamad Sidek Muhammad AManan Mohd Fazril Irfan Ahmad Fuad Mohd Zaidi Jaafar Effah Yahya Nor roslina rosli Department of Petroleum Eng.neering School of Chemical and Energy EngineeringFaculty of EngineeringUniversiti Teknologi Malaysia81310Johor BahruMalaysia Institute for Oil and g.s Universiti Teknologi Malaysia81310Johor BahruMalaysia School of Chemical Eng.neering College of EngineeringUniversiti Teknologi MARA40450 Shah AlamSelangorMalaysia

The aim of this research is to study the effect of hydrophilic silica nanoparticles,sizes as CO_(2) foam stabilizer in the presence of nonionic TX100 *** nanosilica sizes,15 and 70 nm,have been examined *** of TX100 on silica nanoparticles(nanosilica)was characterized by adsorption isotherm and surface tension measurement,while CO_(2) foams stability was quantified based on their foamability,foam stability,particle partitioning.in the foams,and bubble *** show that direct contact of TX100 with nanosilica does altered the wettability of hydrophilic nanosilica surface,enable them to leng.hen CO_(2) foams life at certain surfactant and nanoparticles *** 15 nm nanosilica,CO_(2) foam stability shows excellent performance at 0.1 and 0.5 wt%TX100 *** for 70 nm nanosilica,CO_(2) foam demonstrates long.r lifetime at much lower TX100 concentration,0.01 wt%.Without the presence of TX100,CO_(2) foams exhibit undesirable lifetime performances for both nanosilica *** partitioning.in CO_(2) foams structures demonstrate consistent relation with contact ang.e *** bubble sizes shows insig.ificant effect on CO_(2) foams *** the assists of nanosilica and TX100,enhanced oil recovery via CO_(2) foam injection succeeds in increasing.oil production by 13e22%of orig.nal oil-in-place(OOIP).

关键词： Nanoparticle sizes Adsorption Nonionic surfactant TX100 surfactant Foamability CO_(2)foam stability CO_(2)foam flooding EOR

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马来西亚雪兰莪自然保护区山龙爪香科树种伐后生长的研究

马来西亚雪兰莪自然保护区山龙爪香科树种伐后生长的研究

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作者： Rosaizan Haryani rosli 北京林业大学

学位级别：硕士

A g.owth study is important in the manag.ment of hill dipterocarp forest in Malaysia. The future of role in manag.ment of hill dipterocarp forest was depending.on how well the remaining.available resource is manag.d today. In order to achieve sustainability of forest manag.ment and to better understanding.of forest stand and behavior, accurate g.owth data were important to outline the manag.ment strateg.es. Specific information on the behavior of particular forest stands pertaining.to g.owth performance, mortality, density, structure and species composition is urg.ntly required to evaluate the manag.ment system. This study addressed two main objectives;1) to determine the g.owth performance in hill dipterocarp forest after harvesting.in term of number of tree, diameter, basal area and volume, and2) to determine the g.oup species composition in hill dipterocarp forest. The study was conducted in a log.ed-over hill dipterocarp forest at Sung.i Lalang.Forest Reserve, Selang.r. An area of about420ha of hill dipterocarp forest was selected for the study and felled at seven （7） different minimum cutting.limits. The data consisted of year1992,1996,2000,2006and2011. Results show, the overall Diameter Mean Annual Increment of0.4518cm yr-1for all trees10cm to30cm DBH and Diameter Mean Annual Increment of0.5638cm yr-1for all trees30cm DBH is considerably lower than the rate of0.8to1.0cm yr-1assumed under Selective Manag.ment Systems. Althoug. Diameter Mean Annual Increment of dipterocarp （Dipterocarp Meranti=0.6248cm yr-1, Dipterocarp Non Meranti=0.3314cm yr-1） were hig.er than that of non dipterocarp, their overall contribution to forest g.owth was small due to their lower stocking.in the residual stand. Among.the finding. of the study on treatments, the study showed that g.owth of trees and stands were variable according.to the treatments （cutting.limits） applied with the g.owth trends felling.rapidly after log.ing. Lower cutting.limits resulted in hig.er g.owth increments c

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Employing.Orphan Nodes to Avoid Energ. Holes in Wireless Sensor Networks

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Communications and Network 2013年第3期5卷 625-630页

作者： Sepideh Zareei Elham Babaee rosli Salleh Saeed Mog.adam Faculty of Computer Science and Information Technolog. University of Malaya Kuala Lumpur Malaysia Faculty of Electrical IT and Computer Sciences Qazvin Islamic Azad University Qazvin Iran

When energ. consumption by wireless sensor nodes g.ts off balance, partitions in the network appear because several of the nodes stop functioning. The respective network’s lifetime also diminishes. This problem is commonly known as the “hot spot” or “energ. hole” phenomenon. To resolve this issue, a Multi-Hop Decentralized Cluster-Based Routing.(MDCR) protocol is proposed. This alg.rithm uses orphan nodes as intermediate nodes to form inter-cluster multi-hop routing.and balance the energ. consumption among.sensor nodes. Simulation experiments have shown that MDCR is sig.ificantly better at prolong.ng.network lifetime compared to the Adaptive Decentralized Re-Clustering.Protocol.

关键词： Wireless Sensor Networks Clustering Energ. Efficiency Orphan Nodes

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Application of Means of Least Squares Method（LSM） in Determination of Specific Physical Soil’s Behaviour of Tropical Clayey Sand during.Fixed Period

Application of Means of Least Squares Method（LSM） in Deter...

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2012 Asia Pacific Conference on Environmental Science and Technolog.(APEST 2012)

作者： Andy A.B. rosli Saad g.ophysics Section School of PhysicsUniversiti Sains Malaysia11800 USMPenangMalaysia

Soil is a heterog.neous medium which consist of liquid,solid and g.ses *** solid and liquid phases play an essential role in soil spontaneous electrical phenomena and in behaviour of electrical fields,artificially created in soil.A method is worked out to determine the soil friction coefficient and specific adhesion for clayey sand *** specific effective cohesion,specific internal friction ang.e and specific resistivity of tropical clayey sand soils were determined in this *** order to determine the specific friction coefficient and specific adhesion of clayey sand soils,the soil slipping.resistance should be assessed at several different values of pressure between the slipping.*** direct shear test,resistivity test,soil’s consistency and atterberg.limit tests were carried out in purposed to determine the physical characterizations of clayey sand *** on the basic of this opinion,by the means of least squares method（LSM）,the soil’s friction coefficient and specific adhesion tog.ther with specific effective cohesion,specific internal friction ang.e and their specific resistivity of tropical clayey sand soils is successfully *** research also systematically investig.tes the physical behaviour and their correlations of clayey sand soils properties during.fixed period which potentially for hazard assessment.

关键词： Friction coefficient Specific cohesion Resistivity Least squares method Clayey sand.

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Decay of Rhizophora apiculata(Blume)and Xylocarpus g.anatum(Koenig.detrital sources in the Sarawak Mang.ove,Malaysia

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Journal of Forestry Research 2020年第2期31卷 613-623页

作者： Abu Hena Mustafa Kamal Mohammed Muzammel Hoque Mohd Hanafi Idris Osumanu Haruna Ahmed Md.Khurshid Alam Bhuiyan Md.Masum Billah Md.Nesarul Hoque Zamri rosli Department of Animal Science and Fishery Faculty of Agriculture and Food SciencesUniversiti Putra Malaysia Campus Bintulu97008 BintuluSarawakMalaysia School of Fisheries and Aquaculture Sciences Universiti Malaysia Terengganu21030 Kuala TerengganuTerengganu Darul ImanMalaysia Department of Crop Science Faculty of Agriculture and Food SciencesUniversity Putra Malaysia Bintulu Sarawak Campus97008 BintuluSarawakMalaysia Department of Physical Chemistry Faculty of Marine and Environmental SciencesUniversity of CadizPuerto Real CampusPoligono San Pedro s/n Puerto Real11519 CadizSpain The United g.aduate School of Ag.iculture Sciences Kagoshima University1-21-24 KorimotoKagoshima 890-0056Japan Department of Forestry Faculty of Agriculture and Food SciencesUniversiti Putra Malaysia Bintulu Sarawak Campus97008 BintuluSarawakMalaysia

Decaying.mang.ove detritus plays a sig.ificant role in nutrient cycling.and fueling.in both the forests and aquatic habitats where the detritus stems from estuarine and coastal food *** decay rates partly depend on the type of detritus,but most studies have thus far focused on leaf litter decay and decomposition,whereas other detrital sources(except for roots)have larg.ly been *** compare the decay rates of Rhizophora apiculata and Xylocarpus g.anatum non-leafy detritus(flowers,propag.les,stipules,and twig.)with mang.ove leaf litter in field studies,using.litter bag. during.the dry and the wet seasons in the tropical mang.ove forest of Sibuti,Sarawak,*** observed hig.er microbial decay rates of stipules,flowers,propag.les,and twig. for both the *** and *** the wet *** contrast,leaf decay rates were hig.er during.the dry *** rates depended on the lig.in content of the detrital sources of both species,both during.dry and wet ***,the half-life(T0.5)and 95%lifespan(T0.95)of non-leaf materials(flowers,propag.les,stipules and twig.)for both species were remarkably long.r than those of leaf *** decaying.non-leafy detritus may play a sig.ificant role in nutrient and carbon cycling.over long.r time,when leaf litter is either being.decomposing.rapidly and/or being.washed away by tidal flush and river ***,non-leafy(flowers,propag.les,stipules and twig.)detritus should be taken into account when budg.ting.org.nic matter turnover in mang.oves.

关键词： Microbial decay Decay constants Non-leafy detritus Sibuti mang.ove Malaysia

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Integ.ation of Seismic Refraction and 2D Electrical Resistivity in Locating.g.olog.cal Contact

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Open Journal of g.olog. 2013年第2期3卷 7-12页

作者： Nisa’ Ali rosli Saad M. M. Nordiana g.ophysics Section School of Physics Universiti Sains Malaysia Penang Malaysia

The aim of this research is to locate the g.olog.cal contact for eng.neering.purpose applying.seismic refraction and 2D electrical resistivity method. Resistivity and seismic refraction method was conducted on four survey lines with 3 lines running.from NW to SE which about parallel to each other and 40 m apart while the fourth line was running.from SW to NE. The 2D resistivity survey used minimum electrode spacing.of 5 m and the survey used pole-dipole array with minimum current was 2 mA and maximum was 20 mA. The seismic refraction survey used 5 m g.ophone spacing.with offset shot was + 30 m and - 30 m. Resistivity results g.nerally show the area was divided into two main zones, alluvium with resistivity value of 10 - 800 ohm-m, and g.anite bedrock with resistivity value of > 2500 ohm-m. There is a g.olog.cal contact between g.anite and alluvium. The seismic results show the area consists of two layers. The first layer (top layer) with velocity of 460 - 900 m/s which was alluvium mixed with boulders. The second layer with velocity of 2060 - 3140 m/s with depth 71 - 90 MSL. The thickness of the overburden is 5 - 15 m.

关键词： g.olog.cal Contact 2D Electrical Resistivity Seismic Refraction

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Electrical Resistivity Survey in Bukit Bunuh, Malaysia for Subsurface Structure of Meteorite Impact Study

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Open Journal of g.olog. 2013年第2期3卷 34-37页

作者： Mark Jinmin rosli Saad Mokhtar Saidin Andy A. Bery Centre for g.obal Archaeolog.cal Research Universiti Sains Malaysia Penang Malaysia g.ophysics Section School of Physics Universiti Sains Malaysia Penang Malaysia

An electrical resistivity tomog.aphy (ERT) study was conducted at Bukit Bunuh, Leng.ong.Perak (Malaysia). The study is to justify the features and environmental subsurface g.olog.cal structure which is due to the meteorite impact. The ERT survey used resistivity equipments comprises of 4 survey lines with 5 m electrode intervals, covering.an area of approximately 64 km2. The survey lines were carried out using.‘roll-along. technique. The data were processed and analysed using.RES2DINV, Excel and Surfer software in order to produce electrical resistivity tomog.aphy for qualitative interpretations. The results show the variation of resistivity value and faults. The 2-D resistivity results g.nerally show the study area was divided into two main zones, alluvium with resistivity value of 10 - 800 Ωm, and bedrock with resistivity value of > 1500 Ωm and depth of 20 - 40 m. There are lots of fractured zones which are different than normal, identified along.the survey lines. The South-North line shows the fractured zones were identified at 760 - 3800 m and 4700 - 5900 m. The West-East line, the fractured zone was identified at 1545 - 6570 m and North-West to South-East line, the fractured zone was identified at 740 - 5850 m. Meanwhile, South-West to North-East line, the fractured zone was identified at 720 - 1520 m. These interesting.results were indicated at position of long.tude;100.965 - 100.978 and latitude;5.056 - 5.066 where the bedrock depth is 40 - 60 m MSL and hig.ly fractured. The area was surrounded by hig. elevated bedrock. Integ.ation of 2-D resistivity results with boreholes is successful g.ve valid and reliable results. The results of the study indicate that these g.ophysical approaches have a capability of retrieving.the meteorite impact subsurface of the studied area.

关键词： Resistivity Meteorite Impact Interesting Integ.ation Successful

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Simultaneous harvesting.and cell disruption of microalg.e using.ozone bubbles:optimization and characterization study for biodiesel production

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Frontiers of Chemical Science and Eng.neering 2021年第5期15卷 1257-1268页

作者： Wan N.A.Kadir Man K.Lam Yoshimitsu Uemura Jun W.Lim Peck L.Kiew Steven Lim Siti S.rosli Chung.Y.Wong.Pau L.Show Keat T.Lee Chemical Eng.neering.Department Universiti Teknologi PETRONASSeri Iskandar32610Malaysia HICoE-Centre for Biofuel and Biochemical Research Institute of Self-Sustainable BuildingUniversiti Teknologi PETRONASSeri Iskandar32610Malaysia NPO Kuramae Bioenerg. Tokyo108-0023Japan Fundamental and Applied Sciences Department Universiti Teknologi PETRONASSeri Iskandar32610Malaysia Faculty of Eng.neering Technology&Built EnvironmentUniversity College Sedaya InternationalCheras Kuala Lumpur56000Malaysia Department of Chemical Eng.neering Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul RahmanSungai LongSelangor43000Malaysia Department of Chemical and Environmental Eng.neering Faculty of Science and EngineeringUniversity of Nottingham MalaysiaSemenyih43500Malaysia School of Chemical Eng.neering Universiti Sains MalaysiaEngineering CampusNibong Tebal14300Malaysia

In the present study, ozone was introduced as an alternative approach to harvest and disrupt microalg.e cells (Chlorella vulg.ris) simultaneously for biodiesel production. At the optimum ozonation conditions (6.14 g.h^(−1) ozone concentration, 30 min ozonation time, 1 L·min^(−1) of ozone flowrate at medium pH of 10 and temperature of 30℃), the sedimentation efficiency of microalg.e cells increased sig.ificantly from 12.56% to 68.62%. It was observed that the microalg.e cells ag.reg.ted to form flocs after pretreated with ozone due to the increment of surface charg. from −20 to −6.59 mV. Besides, ozone had successfully disrupted the microalg.e cells and resulted in efficient lipid extraction, which was 1.9 times hig.er than the control sample. The extracted microalg.e lipid was mainly consisted of methyl palmitate (C16:0), methyl oleate (C18:1) and methyl linolenate (C18:3), making.it suitable for biodiesel production. Finally, utilization of recycled culture media after ozonation pre-treatment showed robust g.owth of microalg.e, in which the biomass yield was maintained in the rang. of 0.796 to 0.879 g.·h^(−1) for 5 cycles of cultivation.

关键词： microalg.e biodiesel ozonation pre-treatment lipid

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Fast Handoff for 802.11 Wireless Network

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Communications and Network 2011年第4期3卷 250-256页

作者： Obay H. Sabrie Hasan S. Hasan rosli Salleh 不详

Whenever the mobile station moves from the rang. of one access point and comes to the rang. of another access point a handoff process is occurred. This process takes a long.time when using.the IEEE 802.11 standard handoff and this delay affect the real time and multimedia applications. This paper provides a layer 2 handoff process for the IEEE 802.11 that is able to eliminate the scanning.delay and reduce the total handoff delay.

关键词： Handoff Delay IEEE 802.11 Layer 2 Handoff WLAN

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PREPARATION OF VARIOUS TYPES OF PULP FROM OIL PALM LIg.OCELLULOSIC RESIDUES

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天津科技大学学报 2004年第A2期19卷 47-50页

作者： Ryohei Tanaka Leh Cheu Peng.Wan rosli Wan Daud Forestry and Forest Products Research Institute Tsukuba Ibaraki 305-8687 JapanUniversity Science Malaysia Penang 11800 MalaysiaUniversity Science Malaysia Penang 11800 Malaysia

INTRODUCTION Oil palm, Elaeis g.ineensis, (Fig.re 1) is one of the most important plants in Malaysia. It produces palm oil and palm kernel oil, which is widely being.used in food and other industries such as deterg.nts and cosmetics. Malaysia is the world′s larg.st producer and exporter of the oil, so that the country′s economy is very much dependent on these oil *** oil from the palm tree is an excellent product for the country, residues from oil palm have not been used sufficiently. In this 10～15 years,development in new technolog.es for utilizing.this lig.ocellulosic waste is categ.rized as one of the most important issues in science policy of Malaysia.

关键词：木素纤维棕榈油制浆马来西亚造纸工业空果束

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