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| 1 | DIFFUSION COUPLE BETWEEN HIGHSTRENGTH WEAR-RESISTING ALUMINUM BRONZE AND MACHINING TOOLS MATERIALS显示文摘INTRODUCTIONAluminumbronzeisanimportantengineeringmaterial.Itsexcelentphysical,mechanical,anticorosionandwearresistingprop... | Li, Yuanyuan Zhang, Datung Ngai Tungwai, Leo Xia, Wei Long, Yan | 1999 | 中国有色金属学会会刊:英文版1999，9，1： | 14 |
| 2 | Effect of Die Wall Lubrication on Warm Compaction Powder Metallurgy显示文摘Die wall lubrication was applied on warm compaction powder metallurgy in hope to reduce the concentration level of the admixed lubricant since lubricant is harmful to the mechanical property of the sintered materials. Iron-based samples were prepared by die wall lubricated warm compaction at 135 ℃ and 175 ℃, using polytetrafluoroethylene (PTFE) emulsion as die wall lubricant. A compacting pressure of 700 MPa and 550 MPa were used. The admixed lubricant concentration ranging from 0 to 0.6 wt.% was used in this study. Compared with non-die wall lubricated samples, the die wall lubricated samples have higher green densities. Results show that in addition to the decrease in ejection forces, green density of the compacts increased linearly with the decrease in admixed lubricant content. Mechanical property of the sintered compacts increase sharply when the admixed lubricant concentration reduced to 0.125 wt.% or less. Ejection force data indicated that samples with die wall lubrication show lower ejection forces when compared with samples without die wall lubrication. No scoring was observed in all experiments even for samples contain no admixed lubricant. Our results indicated that under experimental condition used in this study, no matter at which compaction pressure, compaction temperature, graphite and lubricant contents in the powder the die wall lubricated warm compaction would give the highest green density and lowest ejection force. It can be concluded that combination of die wall lubrication and warm compaction can provide P/M products with higher density and better quality. It is a feasible way to produce high performance P/M parts if suitable die wall lubrication system was applied. | LI Yuan-yuan, NGAI Tungwai Leo, ZHANG Da-tong, LONG Yan, XIA Wei (College of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China) | 2002 | 厦门大学学报(自然科学版)2002，41，S1： | 13 |
| 3 | Evidence-based medicine and precision medicine:complementary approaches to clinical decision-making显示文摘Evidence-based medicine is widely promoted for decision-making in health care and is associated with improved patient outcomes.Critics have suggested that evidence-based medicine focuses primarily on groups of patients rather than individuals,but often fail to consider subgroup analyses,N-of-1 trials,and the incorporation of patient values and preferences.Precision medicine has been promoted as an approach to individualize diagnosis and treatment of diseases through genetic,biomarker,phenotypic,and psychosocial characteristics.However,there are often high costs associated with personalized medicine,and high-quality evidence is lacking for effectiveness in many applications.For the potential of personalized medicine to be realized,it must adhere to the principles of evidencebased medicine:(1)evidence in isolation is not sufficient to make clinical decisions—patient’s values and preferences as well as resource implications must be considered,and(2)there is a hierarchy of evidence to guide clinical decision-making and studies at lower risk of bias are likely to provide more trustworthy findings. | Ngai Chow Lucas Gallo Jason W.Busse | 2018 | Precision Clinical Medicine2018，1，2： | 10 |
| 4 | Efficacy of small-volume simethicone given at least 30 min before gastroscopy显示文摘AIM To evaluate the efficacy of 5 m L simethicone solution in decreasing gastric foam if given at least 30 min before gastroscopy.METHODS This was a randomized, placebo controlled, endoscopist blinded study performed at Changi General Hospital. Patients were at least 21 years old, had no prior sur-gical resection of the upper gastrointestinal tract, and scheduled for elective diagnostic gastroscopies. The primary outcome was the total mucosal visibility score(TMVS) which was evaluated using Mc Nally score. The sample size was calculated to be 24 per group(SD 2.4, 80% power, P < 0.05, 2-sample t test). RESULTS Fifty-four patients were randomised to receive either simethicone [1 m L liquid simethicone(100 mg) in 5 m L of water] or placebo(5 m L of water) at least 30 min before their gastroscopy. Six accredited consultants conductedthe gastroscopy, and the interobserver agreement of scoring TMVS was good with a Kappa statistic of 0.73. The simethicone group had significantly better mean TMVS compared to placebo(5.78 ± SD 1.65 vs 8.89 ± SD 1.97, P < 0.001). The improvement was statistically significant for the duodenum and the gastric antrum, angularis, body, and fundus. Percent 51.9 of patients in the simethicone group had a TMVS of 4(no bubbles at all) to 5(only 1 area with minimal bubbles), while in the placebo group 3.7% of patients had TMVS of 4 or 5. The number needed to treat was 2.1 to avoid a TMVS of 6 and more. The simethicone group also had a significantly shorter procedure time with less volume of additional flushes required during gastroscopy to clear away obscuring gastric foam.CONCLUSION With a premedication time of at least 30 min, 5 m L simethicone can significantly decrease gastric foam, decrease the volume of additional flushes, and shorten gastroscopy time. | Mingjun Song Andrew Boon Eu Kwek Ngai Moh Law Jeannie Peng Lan Ong Jessica Yi-Lyn Tan Prem Harichander Thurairajah Daphne Shih Wen Ang Tiing Leong Ang | 2016 | World Journal of Gastrointestinal Pharmacology and Therapeutics2016，7，4： | 10 |
| 5 | Metabolic syndrome and benign prostatic hyperplasia:An update显示文摘Metabolic syndrome(MetS)is a cluster of metabolic abnormalities related to central adiposity and insulin resistance.Its importance is increasingly recognized as it associates with increased risks of metabolic and cardiovascular diseases.These metabolic aberrations of MetS may lead to development of benign prostatic hyperplasia(BPH)and lower urinary tract symptoms(LUTS)in men.A 26.5%-55.6% prevalence of MetS in men with LUTS was reported in worldwide studies.Although the exact biological pathway is not clear yet,insulin resistance,increased visceral adiposity,sex hormone alterations and cellular inflammatory reactions played significant roles in the related pathophysiological processes.Clinician should recognize the cardiovascular and metabolic impacts of MetS in men with LUTS,early risk factors optimization and use of appropriate medical therapy may possibly alter or slower the progression of LUTS/BPH,and potentially avoid unnecessary morbidities and mortalities from cardiovascular and metabolic diseases for those men. | Ho-Yin Ngai Kar-Kei Steffi Yuen Chi-Man Ng Cheung-Hing Cheng Sau-Kwan Peggy Chu | 2017 | Asian Journal of Urology2017，4，3： | 9 |
| 6 | Robotic distal pancreatectomy versus conventional laparoscopic distal pancreatectomy: a comparative study for short-term outcomes显示文摘机器的系统逐渐地在 pancreatectomy 被使用了。然而,这个方法的有效性仍然保持不明确。这研究比较了在帮助机器人的 laparoscopic 之间的外科的结果远侧的 pancreatectomy 和常规 laparoscopic 远侧的 pancreatectomy。在一个 15 年的时期期间, 35 个病人在我们的中心经历了远侧的 pancreatectomy 的最低限度地侵略的途径。十七个这些病人有帮助机器人的 laparoscopic 途径,并且留下 18 有的常规 laparoscopic 途径。他们的起作用的参数和 perioperative 结果在一个未来的数据库回顾地被分析。在机器的组(221.4 min ) 的吝啬的操作时间在 laparoscopic 组(173.6 min ) 比那显著地长(P = 0.026 ) 。机器、常规的 laparoscopic 组没处于脾保藏率(52.9%对38.9%)介绍重要差别( P = 0.505 ),起作用的血损失( 100.3 ml 对 268.3 ml )( P = 0.29 ),全面病态率(47.1%对38.9%)( P = 0.73 ),并且手术后的医院停留( 11.4 天对 14.2 天)( P = 0.46 )。两个组也没显示出 perioperative 死亡。类似的结果在机器的远侧的 pancreatectomy 和常规 laparoscopic 途径被观察。然而,机器的途径趋于有更少的血损失和更短的医院停留的优点。进一步的研究是必要的决定机器的远侧的 pancreatectomy 的临床的位置。 | Eric C. H. Lai Chung Ngai Tang | 2015 | Frontiers of Medicine2015，9，3： | 8 |
| 7 | Rock brittleness indices and their applications to different fields of rock engineering:A review显示文摘Brittleness is an important parameter controlling the mechanical behavior and failure characteristics of rocks under loading and unloading conditions,such as fracability,cutability,drillability and rockburst proneness.As such,it is of high practical value to correctly evaluate rock brittleness.However,the definition and measurement method of rock brittleness have been very diverse and not yet been standardized.In this paper,the definitions of rock brittleness are firstly reviewed,and several representative definitions of rock brittleness are identified and briefly discussed.The development and role of rock brittleness in different fields of rock engineering are also studied.Eighty brittleness indices publicly available in rock mechanics literature are compiled,and the measurement method,applicability and limitations of some indices are discussed.The results show that(1)the large number of brittleness indices and brittleness definitions is attributed to the different foci on the rock behavior when it breaks;(2)indices developed in one field usually are not directly applicable to other fields;and(3)the term“brittleness”is sometimes misused,and many empirically-obtained brittleness indices,which lack theoretical basis,fail to truly reflect rock brittleness.On the basis of this review,three measurement methods are identified,i.e.(1)elastic deformation before fracture,(2)shape of post-peak stressestrain curves,and(3)methods based on fracture mechanics theory,which have the potential to be further refined and unified to become the standard measurement methods of rock brittleness.It is highly beneficial for the rock mechanics community to develop a robust definition of rock brittleness.This study will undoubtedly provide a comprehensive timely reference for selecting an appropriate brittleness index for their applications,and will also pave the way for the development of a standard definition and measurement method of rock brittleness in the long term. | Fanzhen Meng Louis Ngai Yuen Wong Hui Zhou | 2021 | Journal of Rock Mechanics and Geotechnical Engineering2021，13，1： | 8 |
| 8 | MICROSTRUCTURES OF A NOVEL HIGH STRENGTH AND WEAR-RESISTING ZINC ALLOY显示文摘MICROSTRUCTURESOFANOVELHIGHSTRENGTHANDWEAR-RESISTINGZINCALLOYLiYuanyuan;XiaWei;NgaiTungwaiLeo;LuoJunming;ZhengLingyi(Departme... | Li Yuanyuan Xia Wei Ngai Tungwai Leo Luo Junming Zheng Lingyi(Department of Mechanical Engineering,South China University of Technology, Guangzhou 51064) | 1995 | 中国有色金属学会会刊:英文版1995，5，4： | 7 |
| 9 | 复压复烧对烧结减摩Cu-Ti_3SiC_2导电材料性能的影响显示文摘利用粉末冶金技术制备了10%Ti3SiC2颗粒增强Cu基减摩、导电材料。以200,400和500 MPa的压力对烧结试样进行复压,然后复烧,以提高材料的密度。通过测量试样的密度、硬度和电阻率,探索了复压复烧对材料性能的影响,并对试样进行了通电和不通电情况下的摩擦、磨损试验。结果表明,经400 MPa复压复烧后,材料的密度和硬度得到显著提高,密度由7.309 g·cm-3增加至7.712 g·cm-3,而硬度则达到HB 114,导电性能和减摩、抗磨能力也因此得到了改善,摩擦系数有所降低,磨损量减少了68%。与未带电的情况相比,带电时的摩擦因数相对较小,但磨损量则较大。在带电磨损实验过程中,摩擦副的温度升高使样品表面的铜基体部分氧化,并起到了润滑作用,从而降低了摩擦因数。 | 张宝霞 Ngai Tungwai 郑伟 谭文昌 李元元 | 2012 | 稀有金属2012，36，3： | 7 |
| 10 | Influence of grain size on strength of polymineralic crystalline rock: New insights from DEM grain-based modeling显示文摘Grain size effect on rock strength is a topic of great interest in geotechnical engineering.A consensus obtained from earlier laboratory tests is that rock strength generally decreases with the increase of grain size for both silicate and carbonate rocks;however,some recent numerical results conflict with such laboratory test results.To address this intriguing issue,the effect of grain size on strength of polymineralic crystalline rock with low porosity is investigated numerically using the grain-based modeling(GBM)approach in discrete element method(DEM)by interpreting micro-cracking process in response to loading.In agreement with some previous DEM simulation results,the simulated rock strength is found to increase with increasing grain size for both homogeneous and heterogeneous models,even when the number of assembled disks in one mineral grain changes.The mechanism of strength increase with increasing grain size is mainly associated with the number of assembled smooth-joint contacts along grain interfaces and the generation of grain boundary cracks in response to loading.The grain interfaces significantly weaken the integrity of the rock model,which is similar to effects of inherent defects in real rock.As the grain size increases,fewer grain interfaces are built in the model and the rock strength becomes much higher.Hence,by solely changing the mineral grain size in a model,the mechanism of grain size effect as observed in laboratory tests cannot be replicated.To address this issue,a method of degradation of grain boundary strength parameters is used to mimic the possible mechanism of grain size effect.The simulated strength using the method becomes comparable with those obtained from laboratory tests when the heterogeneity in the rock is considered.Degradation of grain boundary parameters with increasing grain size provides a plausible explanation for the grain size effect on rock strength. | Jun Peng Louis Ngai Yuen Wong Cee Ing Teh | 2021 | Journal of Rock Mechanics and Geotechnical Engineering2021，13，4： | 6 |
| 11 | 小切口单髁置换和全膝关节置换配对比较临床早期结果显示文摘目的 通过配对比较 ,观察小切口单髁置换和全膝关节置换治疗单室膝关节骨性关节炎的早期临床结果。方法 2 0 0 1年 6~ 12月 ,新加坡中央医院采用小切口单髁置换连续治疗 5 0例内侧单室膝关节骨关节炎患者 ,同时对在年龄、临床症状、膝关节的X线分级上进行配对比较的 5 0例内侧单室膝关节骨关节炎患者进行全膝关节置换。小切口单髁置换组 ,男 9例 ,女 4 1例 ;年龄 5 2~ 85岁 ,平均 6 4岁。全膝关节置换组 ,男 8例 ,女 4 2例 ;年龄 5 5~ 80岁 ,平均 6 7岁。临床均表现为膝关节内侧间隙疼痛 ,AhlbackX线分级Ⅰ~Ⅲ级。结果 小切口单髁置换组与全膝关节置换组比较 ,具有出血量少、膝关节功能恢复快、住院时间短、并发症少、创伤小、康复快、费用少等优点。结论 对于单室膝关节骨关节炎 ,小切口单髁置换与全膝关节置换术比较 。 | 王铭春 Lo Ngai Nung Yeo Seng Jin Seow Kang Hong Yang Kuang Ying | 2002 | 上海医学2002，25，11： | 5 |
| 12 | Rapidly solidified hypereutectic Al-Si alloys prepared by powder hot extrusion显示文摘Rapidly solidified hypereutectic Al-Si alloys were prepared by powder hot extrusion. By eliminating vacuum degassing procedure, the fabrication routine was simplified. The tensile fracture mechanisms at room temperature and elevated temperature were investigated by SEM fractography. Compared with KS282 casting material, the tensile strength of rapidly solidified Al-Si alloy is greatly improved due to silicon particles refining while its density and coefficient of thermal expansion are lower than those of KS282. The wear resistance of RS AlSi is better than that of KS282. | 李元元 张大童 NGAI Tungwai Leo 张卫文 | 2002 | 中国有色金属学会会刊:英文版2002，12，5： | 5 |
| 13 | Significance of CD90 + Cancer Stem Cells in Human Liver Cancer显示文摘 | Zhen Fan Yang David W. Ho Michael N. Ng Chi Keung Lau Wan Ching Yu Patricia Ngai Patrick W.K. Chu Chi Tat Lam Ronnie T.P. Poon Sheung Tat Fan | 2008 | Cancer Cell2008，，2： | 5 |
| 14 | Fuzzy Multiple Attribute Decision Making for Evaluating Aggregate Risk in Green Manufacturing显示文摘Industrial risk and the diversification of risk types both increase with industrial development. Many uncertain factors and high risk are inherent in the implementation of new green manufacturing methods. Because of the shortage of successful examples and complete and certain knowledge, decision-making methods using probabilities to represent risk, which need many examples, cannot be used to evaluate risk in the implementation of green manufacturing projects. Therefore, a fuzzy multiple attribute decision-making (FMADM) method was developed with a three-level hierarchical decision-making model to evaluate the aggregate risk for green manufacturing projects. A case study shows that the hierarchical decision-making model of the aggregate risk and the FMADM method effectively reflect the characteristics of the risk in green manufacturing projects. | 刘华 陈维平 康志新 NGAI Tungwai 李元元 | 2005 | Tsinghua Science and Technology2005，10，5： | 5 |
| 15 | Laparoscopic approach of surgical treatment for primary hepatolithiasis: a cohort study显示文摘 | Eric C.H. Lai Tang Chung Ngai George P.C. Yang Michael K.W. Li | 2010 | The American Journal of Surgery2010，，5： | 4 |
| 16 | Robot-assisted laparoscopic liver resection for hepatocellular carcinoma: short-term outcome显示文摘 | Eric C.H. Lai George P.C. Yang Chung Ngai Tang | 2013 | The American Journal of Surgery2013，，6： | 3 |
| 17 | Landslide risk assessment and management: an overview显示文摘 | F.C Dai C.F Lee Y.Y Ngai | 2002 | Engineering Geology2002，，1： | 3 |
| 18 | Viral-Human Chimeric Transcript Predisposes Risk to Liver Cancer Development and Progression显示文摘 | Chi-Chiu Lau Tingting Sun Arthur K.K. Ching Mian He Jing-Woei Li Alissa M. Wong Ngai Na Co Anthony W.H. Chan Pik-Shan Li Raymond W.M. Lung Joanna H.M. Tong Paul B.S. Lai Henry L.Y. Chan Ka-Fai To Ting-Fung Chan Nathalie Wong | 2014 | Cancer Cell2014，，3： | 2 |
| 19 | Robot-assisted laparoscopic pancreaticoduodenectomy versus open pancreaticoduodenectomy – A comparative study显示文摘 | Eric C.H. Lai George P.C. Yang Chung Ngai Tang | 2012 | International Journal of Surgery2012，，9： | 2 |
| 20 | Numerical study on coalescence of two pre-existing coplanar flaws in rock显示文摘 | Louis Ngai Yuen Wong Huan-Qiang Li | 2013 | International Journal of Solids and Structures2013，，： | 2 |
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