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Department of Civil Engineering, Universitas Katolik Parahyangan, Bandung, 40141, Indonesiaof loose sand with fungus

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第1期12卷 180-187页

作者： Aswin lim Petra Cahaya Atmaja Siska Rustiani Department of Civil Engineering Universitas Katolik ParahyanganBandung40141Indonesia

This article presents an innovative method of bio-mediated soil improvement for increasing the shear strength of loose *** improvement is realized by mixing the loose sand with the inoculum of Rhizopus oligosporus,a kind of fungus widely used in food industry for making Indonesian *** objective of this article is to investigate the performance and mechanism of mixing tempeh inoculum as a binding agent of loose sand *** inoculum dosage,water content of loose sand,and curing time were examined for identifying the increment of unconfined compressive strength(q_u)of the *** results showed that q_u of the treated samples increased when the inoculum dosage was *** shows that 5.24%inoculum could yield 68 kPa of q_u,and 5%water content and 3 d curing time produced the maximum q_***,the mechanism of hypha and mycelium in binding the soil particles was clearly observed using a digital microscope and scanning electron microscope.

关键词： Bio-mediated soil improvement Loose sand Rhizopus oligosporus

Current surgical management of duodenal gastrointestinal stromal tumors

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World Journal of Gastrointestinal Surgery 2021年第10期13卷 1166-1179页

作者： Kheng Tian lim Department of Surgery Khoo Teck Puat HospitalSingapore 768828Singapore

Duodenal gastrointestinal stromal tumors(D-GISTs)are uncommon mesenchymal tumors and are managed differently to common duodenal epithelial *** may pose surgical challenges due to their unique but complex pancreaticoduodenal location of the gastrointestinal tract near the ampulla of Vater,pancreas,mesenteric blood vessels,biliary and pancreatic *** surgical management of D-GISTs can be performed safely with good oncological outcomes provided an adequate resection margin can be *** current surgical options of resectable primary D-GISTs varies with increasing complexity depending on the location,size and involvement of surrounding structures such as wedge resection with primary closure,segmental resection with small bowel anastomosis or radical *** approaches have been shown to be feasible and safe with good oncological outcomes in experienced *** minimally invasive techniques including robotic-assisted approach will likely increase in the future.D-GISTs have a prognosis comparable to gastric and other small bowel ***,the heterogeneity of different studies and the limited use of systemic tyrosine kinase inhibitor in the neoadjuvant and adjuvant settings may influence the overall survival of resected *** use of limited resection when condition allows is recommended due to lower surgical morbidity,less postoperative complications and better oncologic outcomes.

关键词： Duodenum Gastrointestinal stromal tumors limited resection Pancreaticoduodenectomy Survival

Percutaneous paraumbilical embolization as an unconventional and successful treatment for bleeding jejunal varices

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World Journal of Gastroenterology 2009年第30期15卷 3823-3826页

作者： Lee-Guan lim Yin-Mei Lee Lenny Tan Stephen Chang Seng-Gee lim Department of Gastroenterology and Hepatology National University HospitalSingapore 119074Singapore Department of Diagnostic Radiology National University HospitalSingapore 119074Singapore Department of Surgery National University HospitalSingapore 119074Singapore

A 48-year-old Indian male with alcoholic liver cirrhosis was admitted after being found unresponsive. He was hypotensive and had hematochezia. Esophagogastroduodenoscopy (EGD) showed small esophageal varices and a clean-based duodenal ulcer. He continued to have hematochezia and anemia despite blood transfusions. Colonoscopy was normal. Repeat EGD did not reveal any source of recent bleed. Twelve days after admission, his hematochezia ceased. He refused further investigation and was discharged two days later. He presented one week after discharge with hematochezia. EGD showed non-bleeding Grade 1 esophageal varices and a clean-based duodenal ulcer. Colonoscopy was normal. Abdominal computed tomography (CT) showed liver cirrhosis with mild ascites, paraumbilical varices, and splenomegaly. He had multiple episodes of hematochezia, requiring repeated blood transfusions. Capsule endoscopy identified the bleeding site in the jejunum. Concurrently, CT angiography showed paraumbilical varices inseparable from a loop of small bowel, which had herniated through an umbilical hernia. The lumen of this loop of small bowel opacified in the delayed phase, which suggested variceal bleeding into the small bowel. Portal vein thrombosis was present. As he had severe coagulopathy and extensive paraumbilical varices, surgery was of high risk. He was not suitable for transjugular intrahepatic porto-systemic shunt as he had portal vein thrombosis. Percutaneous paraumbilical embolization via caput medusa was performed on day 9 of hospitalization. Following the embolization, the hematochezia stopped. However, he defaulted subsequent follow-up.

关键词： Embolization Jejunal varices Obscurebleed Capsule endoscopy Angiography

Analysis of non-symmetrical flapping airfoils

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Acta Mechanica Sinica 2009年第4期25卷 433-450页

作者： W.B.Tay K.B.lim Department of Mechanical Engineering National University of Singapore

Simulations have been done to assess the lift, thrust and propulsive efficiency of different types of non-symmetrical airfoils under different flapping configurations. The variables involved are reduced frequency, Strouhal number, pitch amplitude and phase angle. In order to analyze the variables more efficiently, the design of experiments using the response surface methodology is applied. Results show that both the variables and shape of the airfoil have a profound effect on the lift, thrust, and efficiency. By using non- symmetrical airfoils, average lift coefficient as high as 2.23 can be obtained. The average thrust coefficient and efficiency also reach high values of 2.53 and 0.61, respectively. The lift production is highly dependent on the airfoil＇s shape while thrust production is influenced more heavily by the variables. Efficiency falls somewhere in between. Two-factor interac- tions are found to exist among the variables. This shows that it is not sufficient to analyze each variable individually. Vorticity diagrams are analyzed to explain the results obtained. Overall, the S1020 airfoil is able to provide relatively good efficiency and at the same time generate high thrust and lift force. These results aid in the design of a better ornithopter＇s wing.

关键词： Flapping Non-symmetrical Design ofexperiments Ornithopter Airfoil

A Focused Laser Beam:A Useful and Versatile Tool for 1D Nanomaterials Research:A Review

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Journal of Materials Science & Technology 2015年第6期31卷 616-629页

作者： Junpeng Lu Sharon Xiaodai lim Chorng Haur Sow Department of Physics National University of Singapore Department of Science Drive National University of Singapore National University of Singapore

One-dimensional(1D) nanomaterials have generated considerable interest amongst researchers because of their potential as fundamental building block in future nano- and micro-electronic *** this article,we present a review of a focused laser beam system as a versatile tool for the manipulation,structural transformation,micropatterning and chemical modification of 1D *** tool was found to be effective in patterning and modifying various physical and chemical properties of the pristine1 D *** also aids in the fabrication process of heterostructures and 1D nanomaterial based ***,we present the implementation of the focused laser beam setup as a valuable tool in the study of the origins and photoresponse mechanism of the 1D nanomaterial devices.

关键词： Laser Nanomaterials Composite Optoelectronic Elect

Enhancement of thermal stability and UV resistance of halloysite nanotubes using zinc oxide functionalization via a solvent-free approach

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International Journal of Minerals,Metallurgy and Materials 2019年第6期26卷 787-795页

作者： Keemi lim Wen Shyang Chow Swee Yong Pung School of Materials and Mineral Resources Engineering Engineering Campus Universiti Sains Malaysia

The aim of this study was to synthesize and evaluate the thermal properties and ultraviolet(UV)resistance of zinc oxide-functionalized halloysite nanotubes(HNT–ZnO).The HNT–ZnO was synthesized using a facile solvent-free *** properties of the HNT–ZnO nanofillers were characterized using zeta-potential measurement,X-ray diffraction(XRD),field-emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FTIR),and thermogravimetric analysis(TGA).The immobilization of ZnO nanoparticles onto HNT is feasible even at the lowest mass ratio of HNT/*** TGA results indicate that the thermal stability of the HNT–ZnO nanofillers is higher than that of the ***,UV?Vis diffuse reflectance spectroscopy(UV-DRS)results show that the HNT–ZnO achieve a total reflectance as high as approximately 87.5%in the UV region,as compare with 66.9%for the *** summary,the immobilization of ZnO onto HNT is a viable approach for increasing the thermal stability and improving the UV shielding of HNT.

关键词： halloysite nanotubes zinc oxide nanoparticle ultraviolet shielding thermal properties

Fluid-Structure Interaction Analysis of Flexible Plate with Partitioned Coupling Method

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China Ocean Engineering 2019年第6期33卷 713-722页

作者： W.Z.,lim R.Y.,Xiao Faculty of Computing Engineering and the Built EnvironmentBirmingham City UniversityBirminghamB47XGUnited Kingdom Department of Urban Engineering School of The Built Environment and ArchitectureLondon South Bank UniversityBorough RoadLondonSE10AAUnited Kingdom

The development and rapid usage of numerical codes for fluid-structure interaction(FSI) problems are of great relevance to researchers in many engineering fields such as civil engineering and ocean engineering. This multidisciplinary field known as FSI has been expanded to engineering fields such as offshore structures, tall slender structures and other flexible structures applications. The motivation of this paper is to investigate the numerical model of two-way coupling FSI partitioned flexible plate structure under fluid flow. The adopted partitioned method and approach utilized the advantage of the existing numerical algorithms in solving the two-way coupling fluid and structural interactions. The flexible plate was subjected to a fluid flow which causes large deformation on the fluid domain from the oscillation of the flexible plate. Both fluid and flexible plate are subjected to the interaction of load transfer within two physics by using the strong and weak coupling methods of MFS and Load Transfer Physics Environment, respectively. The oscillation and deformation results have been validated which demonstrate the reliability of both strong and weak method in resolving the two-way coupling problem in contribution of knowledge to the feasibility field study of ocean engineering and civil engineering.

关键词： fluid-structure interaction flexible plate structure two-way coupling partitioned method numerical simulation

Design,challenges,and the potential of transcriptomics to understand social behavior

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Current Zoology 2020年第3期66卷 321-330页

作者： Wen Kin lim Ajay S.MATHURU Science Division Yale-NUS College12 College Avenue W estSingapore Institute of Molecular and Cell Biology(IMCB) 61 Biopolis DriveSingapore Department of Physiology Yong Loo Lin School of Medicine(YLL)National University of SingaporeSingapore

Rapid advances in Ribonucleic Acid sequencing(or RNA-seq)technology for analyzing entire transcriptomes of desired tissue samples,or even of single cells at scale,have revolutionized biology in the past *** accessibility and falling costs are making it possible to address many problems in biology that were once considered intractable,including the study of various social ***-seq is opening new avenues to understand long-standing questions on the molecular basis of behavioral plasticity and individual variation in the expression of a *** whole transcriptomes are examined,it has become possible to make unbiased discoveries of underlying mechanisms with little or no necessity to predict genes involved in ***,researchers need to be aware of technical limitations and have to make specific decisions when applying RNA-seq to study social ***,we provide a perspective on the applications of RNA-seq and experimental design considerations for behavioral scientists who are unfamiliar with the technology but are considering using it in their research.

关键词： behavioral variability behavioral plasticity neurotranscriptomics RNA-seq social behaviors

A Steam-Plasma Igniter for Aluminum Powder Combustion

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Plasma Science and Technology 2015年第5期17卷 392-401页

作者： Sanghyup LEE Kwanyoung NOH Jihwan lim Woongsup YOON Mechanical Engineering Department of Yonsei University

High-temperature ignition is essential for the ignition and combustion of energetic metal fuels, including aluminum and magnesium particles which are protected by their high- melting-temperature oxides. A plasma torch characterized by an ultrahigh-temperature plasma plume fulfills such high-temperature ignition conditions. A new steam plasma igniter is designed and successfully validated by aluminum power ignition and combustion tests. The steam plasma rapidly stabilizes in both plasma and steam jet modes. Parametric investigation of the steam plasma jet is conducted in terms of arc strength. A high-speed camera and an oscilloscope method visualize the discharge characteristics, and optical emission spectroscopy measures the thermochemical properties of the plasma jet. The diatomic molecule OH fitting method, the Boltzmann plot method, and short exposure capturing with an intensified charge coupled device record the axial distributions of the rotational gas temperature, excitation temperature, and OH radical distribution, respectively. The excitation temperature at the nozzle tip is near 5500 K, and the gas temperature is 5400 K.

关键词： steam plasma igniter aluminum emission spectroscopy energetic metal fuels powder ignition and combustion optical