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Measuring gravitational effect of superintense laser by spin-squeezed Bose-Einstein condensates interferometer

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Chinese Physics B 2022年第5期31卷 265-273页

作者： Eng boon Ng C.H.Raymond ooi Department of Physics University of MalayaKuala Lumpur 50603Malaysia

We consider an extremely intense laser,enclosed by an atom *** gravitational potential generated from the high-intensity laser is solved from the Einstein field equation under the Newtonian *** compute the strength of the gravitational force and study the feasibility of measuring the force by the atom *** intense laser field from the laser pulse can induce a phase change in the interferometer with Bose-Einstein *** push up the sensitivity limit of the interferometer with Bose-Einstein condensates by spin-squeezing effect and determine the sensitivity gap for measuring the gravitational effect from intense laser by atom interferometer.

关键词： intense laser field atom interferometer Bose-Einstein condensates spin-squeezing

The risk of prostate cancer on incidental finding of an avid prostate uptake on 2-deoxy-2-[^(18)F]fluoro-D-glucose positron emission tomography/computed tomography for non-prostate cancer-related pathology:A single centre retrospective study

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Asian Journal of Urology 2024年第1期11卷 33-41页

作者： Anthony Franklin Troy Gianduzzo boon Kua David Wong Louise McEwan James Walters Rachel Esler Matthew J.Roberts Geoff Coughlina John W.Yaxley Department of Urology The Wesley HospitalBrisbaneQLDAustralia Wesley Medical Research BrisbaneQLDAustralia school of Medicine The University of QueenslandBrisbaneQLDAustralia Department of Radiology Wesley Medical ImagingBrisbaneQLDAustralia Department of Urology Royal Brisbane and Women's HospitalBrisbaneQLDAustralia

Objective:To review the risk of prostate cancer(PCa)in men with incidentally reported increased intraprostatic uptake at 2-deoxy-2-[18F]fluoro-d-glucose positron emission tomography/computed tomography(18F-FDG PET/CT)ordered at Department of Urology,The Wesley Hospital,Brisbane,QLD,Australia for non-PCa related ***:Retrospective analysis of consecutive men between August 2014 and August 2019 presenting to a single institution for 18F-FDG PET/CT for non-prostate related conditions was *** were classified as benign,indeterminate,or malignant depending of the results of prostate-specific antigen(PsA),PsA velocity,biopsy histopathology,and three-Tesla(3 T)multiparametric MRI(mpMRI)Prostate Imaging Reporting and Data system score,or gallium-68-prostate-specific membrane antigen(68Ga-PsMA)PET/CT ***:Three percent(273/9122)of men demonstrated 18F-FDG avidity within the ***-five percent(231/273)were further investigated,including with PsA tests(227/231,98.3%),3 T mpMRI(68/231,29.4%),68Ga-PsMA PET/CT(33/231,14.3%),and prostate biopsy(57/231,24.7%).Results were considered benign in 130/231(56.3%),indeterminate in 31/231(13.4%),and malignant in 70/231(30.3%).PCa was identified in 51/57(89.5%)of the men who proceeded to biopsy,including 26/27(96.3%)men with Prostate Imaging Reporting and Data system scores 4-5 mpMRI and six men with a positive 68Ga-PsMA PET/*** most common Gleason score on biopsy was greater than or equal to 4+5(14/51,27.5%).68Ga-PsMA PET/CT was concordant with the 18F-FDG findings in 26/33(78.8%).All 13 men with a positive concordant 18F-FDG,3 T mpMRI,and 68Ga-PsMA PET/CT had PCa on *** was no statistically significant difference in the 18F-FDG maximum standardized uptake value between the benign or malignant groups(5.7 vs.6.1;p=0.580).Conclusion:In this study,after an incidental finding of an avid intraprostatic lesion on 18F-FDG PET/CT,70 of the 231 cases(30.3%;0.8%of the entire cohort)had results c

关键词： Prostatecancer Positionemission tomography Multiparametric magneticresonance imaging Prostatebiopsy

Performance of pulsed plasma thruster at low discharge energy

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Plasma science and Technology 2024年第4期26卷 122-132页

作者：李鸿俊林泽豪胡浩俊吴文东陈爱虹杜德扬 Department of Physics Faculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Faculty of Engineering The University of Nottingham Malaysia CampusSemenyih 43500Malaysia Faculty of Engineering Multimedia UniversityCyberjaya 63100Malaysia

As the size of satellites scales down, low-power and compact propulsion systems such as the pulsed plasma thruster(PPT) are needed for stabilizing these miniature satellites in orbit. Most PPT systems are operated at 2 J or more of discharge energy. In this work, the performance of a PPT with a side-fed, tongue-flared electrode configuration operated within a lower discharge energy range of 0.5-2.5 J has been investigated. Ablation and charring of the polytetrafluoroethylene propellant surface were analyzed through field-effect scanning electron microscopy imaging and energy-dispersive X-ray spectroscopy. When the discharge energy fell below 2 J, inconsistencies occurred in the specific impulse and the thrust efficiency due to the measurement of the low mass bit. At energy ≥2 J, the performance parameters are compared with other PPT systems of similar configuration and discussed in depth.

关键词： pulsed plasma thruster low discharge energy performance parameters

Prevalence and risk factors for impaired renal function among Asian patients with nonalcoholic fatty liver disease

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Hepatobiliary & Pancreatic Diseases International 2024年第3期23卷 241-248页

作者： Chao sun George boon-Bee Goh Wan-Cheng Chow Wah-Kheong Chan Grace Lai-Hung Wong Wai-Kay seto Yi-Hsiang Huang Han-Chieh Lin I-Cheng Lee Hye Won Lee seung Up Kim Vincent Wai-sun Wong Jian-Gao Fan Center for Fatty Liver Disease Department of GastroenterologyXinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai Key Lab of Pediatric Gastroenterology and NutritionShanghai 200092China Department of Gastroenterology&Hepatology Singapore General HospitalSingaporeSingapore Gastroenterology and Hepatology Unit Department of MedicineFaculty of MedicineUniversity of MalayaKuala LumpurMalaysia Department of Medicine and Therapeutics and state Key Laboratory of Digestive Disease The Chinese University of Hong KongHong KongChina Department of Medicine The University of Hong KongHong KongChina Institute of Clinical Medicine National Yang Ming Chiao Tung University School of MedicineTaipeiTaiwanChina Division of Gastroenterology and Hepatology Taipei Veterans General HospitalTaipeiTaiwanChina Faculty of Medicine National Yang Ming Chiao Tung University School of MedicineTaipeiTaiwanChina Department of Internal Medicine Yonsei University College of MedicineSeoulKorea

Background:Nonalcoholic fatty liver disease(NAFLD)is associated with impaired renal function,and both diseases often occur alongside other metabolic ***,the prevalence and risk factors for impaired renal function in patients with NAFLD remain *** objective of this study was to identify the prevalence and risk factors for renal impairment in NAFLD ***:All adults aged 18-70 years with ultrasound-diagnosed NAFLD and transient elastography examination from eight Asian centers were enrolled in this prospective *** fibrosis and cirrhosis were assessed by Fibroscan-aspartate aminotransferase(FAsT),Agile 3+and Agile 4 *** renal function and chronic kidney disease(CKD)were defined by an estimated glomerular filtration rate(eGFR)with value ofspectively,as estimated by the CKD-Epidemiology Collaboration(CKD-EPI)***:Among 529 included NAFLD patients,the prevalence rates of impaired renal function and CKD were 37.4%and 4.9%,*** multivariate analysis,a moderate-high risk of advanced liver fibrosis and cirrhosis according to Agile 3+and Agile 4 scores were independent risk factors for CKD(Psed fasting plasma glucose(FPG)and blood pressure were significantly associated with impaired renal function after controlling for the other components of metabolic syndrome(Ps with normoglycemia,those with prediabetes[FPG≥5.6 mmol/L or hemoglobin A1c(HbA1c)≥5.7%]were more likely to have impaired renal function(Psions:Agile 3+and Agile 4 are reliable for identifying NAFLD patients with high risk of *** glycemic control in the prediabetic stage might have a potential renoprotective role in these patients.

关键词： Nonalcoholic fatty liver disease Impaired renal function Agile 3+ Agile 4 Metabolic syndrome

Assessment of the kinetic–frictional model for dense granular flow

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Particuology 2008年第1期6卷 50-58页

作者： boon Ho Ng Mojtaba Ghadiri Institute of Particle science&Engineering University of LeedsLeeds LS2 9JTUK

This paper aims to quantitatively assess the application of kinetic-frictional model to simulate the motion of dry granular materials in dense condition, in particular, the annular shearing in Couette configuration. The weight of frictional stress was varied to study the contribution of the frictional stress in dense granular flows. The results show that the pure kinetic-theory-based computational fluid dynamics （CFD） model （without frictional stress） over-predicts the dominant solids motion of dense granular flow while adding frictional stress [schaeffer, D. G. （1987）. Instability in the evolution equations describing incompressible granular flow. Journal of Differential Equations, 66（1）, 19-50] with the solids pressure of [Lun, C. NTK., savage, s. B., Jeffrey, D. J., ＆ Chepurniy, N. （1984）. Kinetic theories for granular flow： Inelastic particles in Couette flow and slightly inelastic particles in a general flow field. Journal of Fluid Mechanics, 140, 223-256] in the CFD model improves the simulation to better conform available experimental results. The results also suggest that frictional stress transmission plays an important role in dense granular flow and should not be neglected in granular flow simulations. Compatible simulation results to the experimental data are seen by increasing the weight of frictional stress to a factor of 1.25-1.5. These improved simulation results suggest the current constitutive relations （kinetic-frictional model） need to be improved in order to better reflect the real dense granular flow.

关键词： Gas-solids flow CFD Constitutive relations Couette flow Kinetic theory Kinetic-frictional model

Engineering Geology of Limestone in Malaysia

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Acta Geologica sinica(English Edition) 2001年第3期75卷 316-324页

作者： TAN boon-Kong Geology Programme Faculty of Science & Technology Universiti Kebangsaan Malaysia Bangi Malaysia

This paper provides an overview of the engineering geology of limestone. Limestone is of rather wide occurrence in Malaysia. It is interesting in view of the unique landforms and karstic features that are encountered in limestone terrains, e.g. steep, subvertical limestone cliffs rising abruptly and majestically above the ground surface and highly variable and pinnacled subterranean limestone bedrock. The karstic features and associated engineering geological problems of both the limestone hills and the bedrock are discussed in the paper. Rockfalls, sinkholes, cavities, etc. are some of the common engineering geological problems associated with limestone terrains. some local case studies are provided as illustrations. Finally the rock mechanical properties of limestone is discussed at the end of the paper.

关键词： engineering geology limestone Malaysia

广西歧舌苔属植物研究及一中国新记录种毛缘歧舌苔

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西北植物学报 2024年第8期44卷 1338-1344页

作者：王顺莉韦玉梅唐启明何文钏彭涛贵州师范大学生命科学学院贵阳550025 广西壮族自治区中国科学院广西植物研究所广西喀斯特植物保育与恢复生态学重点实验室广西桂林541006 国家公园局新加坡植物园新加坡259569

【目的】了解歧舌苔属植物在广西的实际分布情况,为广西苔藓植物研究增加新资料的同时,也为中国苔藓植物多样性保护添加必要的基础数据。【方法】通过野外调查结合广西植物标本馆(IBK)馆藏标本的核查,获得歧舌苔属植物研究材料,经室内... 详细信息

【目的】了解歧舌苔属植物在广西的实际分布情况,为广西苔藓植物研究增加新资料的同时,也为中国苔藓植物多样性保护添加必要的基础数据。【方法】通过野外调查结合广西植物标本馆(IBK)馆藏标本的核查,获得歧舌苔属植物研究材料,经室内形态观察及查阅相关文献,确定其物种多样性。【结果】发现广西歧舌苔属植物标本10份,最终确认广西歧舌苔属植物3种,分别为毛缘歧舌苔[schistochila sciurea(Nees)schiffn.]、大歧舌苔[***(Nees&Blume)***&steph.]、阔叶歧舌苔[***(Nees)Trevis.]。【结论】歧舌苔科以及歧舌苔属均为首次在广西记录的科属,其中毛缘歧舌苔是中国新记录种。文章对毛缘歧舌苔的形态特征进行详细描述,对另外2个种主要形态特征进行归纳,并提供各个种的引证标本信息、地理分布以及彩色图版。

关键词：歧苔类植物歧舌苔属广西新分布

Reassessment of functional dyspepsia:From the editor

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World Journal of Gastroenterology 2006年第17期12卷 2660-2666页

作者： Andrew seng boon Chua MD

Dyspepsia refers to group of upper gastrointestinal symptoms that occur commonly in adults. Dyspepsia is known to result from organic causes, but the majority of patients suffer from non-ulcer or functional dyspepsia. Epidemiological data from population-based studies of various geographical locations have been reviewed, as they provide more realistic information. Population-based studies on true functional dyspepsia （FD） are few, due to the logistic difficulties of excluding structural disease in large numbers of people. Globally, the prevalence of uninvestigated dyspepsia （UD） varies between 7%- 45%, depending on definition used and geographical location, whilst the prevalence of FD has been noted to vary between 11%-29.2%. Risk factors for FD have been shown to include females and underlying psychological disturbances, whilst environmental/lifestyle habits such as poor socio-economic status, smoking, increased caffeine intake and ingestion of non-steroidal anti-inflammatory drugs appear to be more relevant to UD. It is clear that dyspepsia and FD in particular are common conditions globally, affecting most populations, regardless of location.

关键词： Dyspepsia Functional dyspepsia Geographical variation Uninvestigated dyspepsia Prevalence Epidemiology

A DFT study on brittle-to-ductile transition of D022-TiAl3 using multi-doping and strain-engineered effects

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Journal of Materials science & Technology 2020年第16期47卷 180-192页

作者： boon Teoh Tan shunnian Wu Franklin Anariba Ping Wu Entropic Interface Croup Engineering Product DevelopmentSingapore University of Technology and DesignSingapore Materials surface Group Science and Math Affiliated to Engineering Product DevelopmentSingapore University of Technology and DesignSingapore

In this work,the thermodynamic,mechanical properties and electronic behaviors of D022-TiAl3 doped with W and 15 groupⅣM(M=C,Ge,Pb,si and sn)dopants are investigated by DFT *** established that ductility can be improved using multi-doping approach and revealed the mechanisms behind such brittle-to-ductile *** addition,it is found that there is linearity between changes in Young’s modulus and tensile/compre s sive strain *** alternate insight into brittle-to-ductile transition during ductile mode cutting of brittle materials is proposed.

关键词： Multi-doped TiAl3 Brittle-to-Ductile transition Elastic properties First-principles calculation strain-engineered