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Emission wavelength selection via anomalous polarized fluorescence in ZnO-C nanowires

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Nano Research 2024年第5期17卷 4489-4497页

作者： Joon kiat Kang Kim Yong lim Chorng Haur Sow Department of Physics National University of SingaporeSingapore 117542Singapore

Defect fluorescence from high aspect ratio semiconductor nanowires typically displays a weak polarization parallel to the nanowire’s long axis due to dielectric mismatch in high aspect ratio ***,anomalous 2.2 eV defect fluorescence distinctly polarized perpendicular to the nanowire is observed and measured from carbon-incorporated zinc oxide *** observations are significant because polarized defect emissions with consistent polarization on a mesoscopic scale are *** a systematic study and comparison of experimental results with density functional theory calculations,an oriented defect complex comprising carbon substituting on an oxygen site and an oxygen vacancy(CO-VO)is deduced to be responsible for the anomalous yellow fluorescence,demonstrating a method for relating atomic-scale defect geometry to mesoscopic *** anomalous emission can appear in both green-and red-fluorescing nanowires grown with different carbon concentrations,verifying the independence and uniqueness of the 2.2 eV *** allows for polarization-dependent emission wavelength selection from a single nanowire.

关键词： anomalous polarization defects fluorescence zinc oxide carbon

3D laparoscopy and fluorescence imaging can improve surgical precision for hepatectomy

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Hepatobiliary Surgery and Nutrition 2024年第3期13卷 544-547页

作者： Joshua Sheng Hao lim Vishal G.Shelat Department of General Surgery Tan Tock Seng HospitalSingaporeSingapore

Laparoscopic hepatectomy for the treatment of hepatocellular carcinoma(HCC)has been shown to have superior short-term and comparable long-term outcomes compared with open hepatectomy in experienced centres(1).Short-term advantages include small incisions,reduced post-operative pain,faster recovery,reduced blood loss and lower risk of complications(2).However,the loss of tactile sensation makes it challenging to accurately locate lesions and define tumour margins.

关键词： 3D laparoscopy hepatocellular carcinoma(HCC) indocyanine green dye(ICG dye) liver resection

Understanding Risk Governance:Introducing Sociological Neoinstitutionalism and Foucauldian Governmentality for Further Theorizing

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International Journal of Disaster Risk Science 2011年第3期2卷 11-20页

作者： Wee-kiat lim Department of Sociology University of Colorado Boulder Colorado 80309 USA Natural Hazards Center Institute of Behavioral Science Boulder Colorado 80309 USA

This article traces the career of risk across prominent theoretical approaches by highlighting their key assumptions and premises,specifically the technical approach found in the physical sciences,and economics,psychology,and sociology in the social *** each discipline,the strengths and limitations of each theoretical approach are pointed *** discussion focuses on sociology in particular because other approaches—in treating risks as dominantly technical,psychological,or economic phenomena—tend to downplay the broader historical and socio-political context that impinges on risk construction and production,and its differential impact across *** exploration points out that institutions play an important role in creating,managing,and distributing risks in *** highlighting the integrated risk governance framework as a nascent practice-oriented framework,the framework is examined theoretically using sociological neoinstitutionalism and Foucault’s concept of *** conclusion elaborates the challenges of using these two bodies of knowledge to study risk governance of extreme *** Foucault’s concept of governmentality corrects neoinstitutional theory’s ambivalence toward power,more work needs to be done in order to reconcile their divergent intellectual commitments.

关键词： extreme sociology governmental

Biomimetic Fe_(7)S_(8)/Carbon electrocatalyst from[FeFe]-Hydrogenase for improving pH-Universal electrocatalytic hydrogen production Special Collection:Aggregation-Induced Processes and Functions

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Aggregate 2024年第1期5卷 451-459页

作者： Dohun Kim Subramani Surendran Sejin Im Jaehyoung lim Kyoungsuk Jin Ki Tae Nam Uk Sim Department of Energy Science&Engineering Daegu Gyeongbuk Institute of Science&Technology(DGIST)DaeguRepublic of Korea Hydrogen Energy Technology Laboratory Korea Institute of Energy Technology(KENTECH)NajuRepublic of Korea Department of Chemistry Korea UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoulRepublic of Korea

Efficient and cost-effective electrocatalysts that can operate across a wide range of pH conditions are essential for green hydrogen *** by biological systems,Fe_(7)S_(8)nanoparticles incorporated on polydopamine matrix electrocatalyst were synthesized by co-precipitation and annealing *** resulting Fe_(7)S_(8)/C electrocatalyst possesses a three-dimensional structure and exhibits enhanced electrocatalytic performance for hydrogen production across various pH ***,the Fe_(7)S_(8)/C electrocatalyst demonstrates exceptional activity,achieving low overpotentials of 90.6,45.9,and 107.4 mV in acidic,neutral,and alkaline environments,*** impedance spectroscopy reveals that Fe_(7)S_(8)/C exhibits the lowest charge transfer resistance under neutral conditions,indicating an improved proton-coupled electron transfer ***-wave electron paramagnetic resonance results confirm a change in the valence state of Fe from 3+to 1+during the hydrogen evolution reaction(HER).These findings closely resemble the behavior of natural[FeFe]-hydrogenase,known for its superior hydrogen production in neutral *** remarkable performance of our Fe_(7)S_(8)/C electrocatalyst opens up new possibilities for utilizing bioinspired materials as catalysts for the HER.

关键词： biomimetic electrocatalyst hydrogen production renewable energy

Validation of four Helicobacter pylori rapid blood tests in a multi-ethnic Asian population

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World Journal of Gastroenterology 2005年第42期11卷 6681-6683页

作者： Lee-Guan lim Khay-Guan Yeoh Bow Ho seng-Gee lim Department of Gastroenterology and Hepatology National University Hospital 5 Lower Kent Ridge Road Singapore 119074 Republic of Singapore Department of Microbiology National University of Singapore Lower Kent Ridge Road Singapore 119260 Republic of Singapore

AIM: To validate the accuracy of four rapid blood tests in the diagnosis of Helicobacter ***: Consecutive dyspeptic patients scheduled for endoscopy at the National University Hospital,Singapore, were interviewed and had blood drawn for serology. The first 109 patients were tested with BM-test (BM), Pyloriset Screen (PS) and QuickVue (QV), and the next 99 subjects were tested with PS and Unigold (UG).Endoscopies were performed blinded to rapid blood test results and biopsies were taken for culture and rapid urease test. Urea breath tests were performed after endoscopies. The rapid blood test results were compared with four reference tests (rapid urease test, culture,serology, and breath test).RESULTS: The study population composed of 208patients (mean age 43.1 years; range 18-73 years; 119males; 174 Chinese). The number of evaluable patientsfor BM, QV, UG and PS were 102, 102, 95, and 197,respectively. The sensitivity and specificity, respectively were: PS 80.2%, 95.8%; UG 55.9%, 100%; QV 43.3%,100%; BM 67.2%, 97.1%.CONCLUSION: The rapid blood test kits showed high specificity and positive predictive value (97-100%), while sensitivity and negative predictive value ranged widely (43%-80% and 47%-73%, respectively). Among test kits, PS showed the best sensitivity (80%), best negative predictive value (73%) and best negative likelihood ratio (0.207). PS had a specificity of 96%, positive predictive value of 97% and positive likelihood ratio of 19.1.

关键词： Helicobacter pylori Rapid blood test

Dynamic Force Reduction and Heat Transfer Improvement for Horizontal Tubes in Large-Particle Gas-Fluidized Beds

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Journal of Thermal Science 2008年第1期17卷 77-83页

作者： Yusumi Nagahashi John R.Grace Kok-seng lim Yutaka Asako Dept.Mech.Eng. Kochi National College of Technol.KochiJAPAN Professor Dept.Chem.Biological Eng. The University of British ColumbiaVancouverCANADA CSIRO Minerals VictoriaAUSTRALIA Dept.Mech.Eng. Tokyo Metropolitan UniversityTokyoJAPAN

The effects of tube bank configuration on forces and heat transfer were investigated for both two-dimensional and three-dimensional gas fluidized beds. Effective dynamic forces and heat transfer coefficients were measured for several tube bank configurations, and it was found that the average forces are smaller than for a single tube. The heat transfer coefficient can be increased by providing sufficient space for particles to descend around both sides of the tube bank. The results provide useful guidelines for optimizing the configuration of tube banks to achieve high heat transfer coefficients while reducing tube erosion due to dynamic forces.

关键词： fluidized beds forces heat transfer tube arrangement sofid circulation

Economic Assessment of Standby Diesel Generator for Peak Reduction in Commercial and Industrial Buildings:A Case Study in Malaysia

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Journal of Electronic Science and Technology 2017年第4期15卷 400-406页

作者： Kein Huat Chua Yun seng lim Jee Xiong Chew Universiti Tunku Abdul Rahman Cheras 43000 Malaysia

This paper outlines the barriers and potential benefits of using standby diesel generators in mitigating the peak demands for commercial and industrial customers. The feasibility of utilizing the standby diesel generators to reduce the electricity bills for customers is carried out by using the hybrid optimization model for electric renewable(HOMER)software. The size of the standby diesel generator and its operational duration are determined based on the lowest cost of electricity obtained from the evaluations. The economic assessments demonstrate that there is potential to reduce the electricity bills for commercial and industrial customers under the existing fuel price and tariffs. The commercial customers under the tariff C2 have the highest potential to save their electricity bills with the use of standby diesel generators for peak reduction. This study demonstrates the potential of the standby diesel generators in peak reduction.

关键词： Commercial and industrial customers cost of electricity hybrid optimization model for electric renewable(HOMER) peak reduction standby diesel generator

Size prediction of κ-carrageenan droplets formed in co-flowing immiscible liquid

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Particuology 2011年第6期9卷 637-643页

作者： Jun-Yee Leong Tek-Kaun lim Ravindra Pogaku Eng-seng Chan Centre of Materials and Minerals School of Engineering and Information Technology Universiti Malaysia Sabah School of Engineering Monash University

The formation of K-carrageenan droplets in channel emulsification was experimentally investigated. The dispersed phase was vertically injected into co-flowing immiscible palm oil in the direction of gravity. This study focused on predicting K-carrageenan drop size using force balance analysis. The force balance model considers the interracial tension to be the solitary attaching force, while a combination of the drag force from the co-flowing palm oil and the body force of the extruding K-carrageenan liquid act as the detaching forces. The conventional model gave poor predictions for droplet size, with an average relative deviation of 23%. This large deviation could be attributed to necking phenomena and an underestimation of the drag force generated on the shear-thinning K-carrageenan solution. By incorporating correction factors, the average relative deviation of the force balance model dronned to 4%.

关键词： K-Carrageenan Droplet Channel emulsification Co-flowing Dripping Bioencapsulation

Primary care physicians'knowledge,attitude and perception towards homosexuality in Singapore

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Global Health Journal 2021年第4期5卷 209-214页

作者： Derek lim seng Bin Ang Kandang Kerbau Women’s and Children’s Hospital 100 Bukit Timah Road Singapore

Aims:This study aim to gain insights into attitudes,acceptance and knowledge levels among family physicians toward homosexual people,which are important as they may affect care among this at-risk ***:An anonymized self-administered questionnaire in English was posted with the assistance of the College of Family Physicians Singapore in February 2015 to its 1529 members with self-addressed,pre-stamped envelopes for *** questionnaire included demographic questions such as age group,gender,religion,ethnicity,marital status and place of *** and scales that measured attitude,acceptance,knowledge and perception of colleagues who are homosexual were also included in the ***:451 responses(29.5%)were obtained,of which 441 were valid(28.84%).About 52.8%of participants were found to have negative,8.9%neutral and 38.3%positive attitudes toward ***(75.6%)were accepting of homosexuals,with 9.3%neutral and 15.1%not *** levels were poor,with a mean score of 6.9 out of a maximum of 13.A strong correlation was found between the attitudes towards lesbians and gay men(ATLG)and acceptance of homosexuals scales(r=0.69,P<0.001),with moderate correlations between acceptance and knowledge(r=0.54,P<0.001)and ATLG and Knowledge(r=0.54,P<0.001).Conclusion:Despite majority of family physicians having negative attitudes towards homosexuality,most are able to accept *** better education in sexual orientation in the medical educational curriculum,the increase in knowledge will lead to better care for people with homosexuality.

关键词： Attitudes Acceptance Family physician Homosexuality Knowledge Stigma Sexual orientation Singapore