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Engineering behaviour of in situ cored deep cement mixed marine deposits subjected to undrained and drained shearing

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1749-1760页

作者： Wei Li chung yee kwok Faculty of Engineering China University of GeosciencesWuhan430074China Department of Civil Engineering The University of Hong Kong999000Hong Kong SARChina

The deep cement mixing(DCM)is used to improve the capacity and reduce the settlement of the soft ground by forming cemented clay *** investigation on the mechanical behaviour of the DCM samples is limited to either laboratory-prepared samples or in-situ samples under unconfined *** this study,a series of drained and undrained triaxial shearing tests was performed on the in-situ cored DCM samples with high cement content to assess their mechanical *** is found that the drainage condition affects significantly the stiffness,peak and residual strengths of the DCM samples,which is mainly due to the state of excess pore water pressure at different strain levels,*** positive before the peak deviatoric stress and negative after the peak deviatoric stress,in the undrained *** slope of the failure envelope changes obviously with the confining pressures,being steeper at lower stress levels and flatter at higher stress *** strength parameters,effective cohesion and friction angle obtained from lower stress levels(c′0 andφ′0)are 400 kPa and 58°,respectively,which are deemed to be true for design in most DCM applications where the in-situ stress levels are normally at lower values of 50-200 ***,the computed tomography(CT)scanning system was adopted to visualize the internal structures of DCM *** is found that the clay pockets existing inside the DCM samples due to uneven mixing affect markedly their stress-strain behaviour,which is one of the main reasons for the high variability of the DCM samples.

关键词： Deep cement mixing(DCM) In-situ cored sample Triaxial shearing Drainage condition Confining pressure Computed tomography(CT)

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Implementation of rotational resistance models＇ A critical appraisal

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Particuology 2017年第5期15卷 14-23页

作者： Xin Huang Kevin J. Hanley Catherine O'Sullivan chung-yee kwok a Department of Geotechnical Engineering Tongji University Shanghai 200092 China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji University Shanghai 200092 China Institute for Infrastructure and Environment School of Engineering The University of Edinburgh Edinburgh EH9 3JL United Kingdom Skempton Building Department of Civil and Environmental Engineering Imperial College London London SW72AZ United Kingdom Haking Wong Building Department of Civil and Environmental Engineering The University ofHong Kong Hong Kong China

Contact models that simulate rotational resistance at particle contacts have been proposed as a means to capture the effect of shape in DEM simulations. This contribution critically explores some key issues related to the implementation of rotational resistance models; these include the need for physically meaningful model parameters, the impact of the model on the overall numerical stability/critical time increment for the DEM model, model validation, and the assessment of model performance relative to real physical materials. The discussion is centred around a rotational resistance model that captures the resistance provided by interlocking asperities on the particle surface. An expression for the maximum permissible integration time step to ensure numerical stability is derived for DEM simulations when rotational resistance is incorporated. Analytical solutions for some single-contact scenarios are derived for model validation. The ability of this type of model to provide additional fundamental insight into granular material behaviour is demonstrated using particle-scale analysis of triaxial compression simulations to examine the roles that contact rollin~ and slidin~ have on the stability of stron：~ force chains.

关键词： Granular mediaParticle shapeDiscrete element methodRollingTwistingRotational resistance

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Robotic surgery for rectal cancer: A systematic review of current practice

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World Journal of Gastrointestinal Oncology 2014年第6期6卷 184-193页

作者： Tony Wing chung Mak Janet Fung yee Lee Kaori Futaba Sophie Sok Fei Hon Dennis kwok Yu Ngo Simon Siu Man Ng Division of Colorectal Surgery Department of Surgery The Chinese Uni-versity of Hong Kong Prince of Wales Hospital Department of Colorectal Surgery University Hospital Birmingham NHS Trust

AIM: To give a comprehensive review of current litera-ture on robotic rectal cancer ***: A systematic review of current literature via PubMed and Embase search engines was per-formed to identify relevant articles from january 2007 to november 2013. The keywords used were: "robotic surgery", "surgical robotics", "laparoscopic computer-assisted surgery", "colectomy" and "rectal resection". RESULTS: After the initial screen of 380 articles, 20 pa-pers were selected for review. A total of 1062 patients(male 64.0%) with a mean age of 61.1 years and body mass index of 24.9 kg/m2 were included in the *** of 1062 robotic-assisted operations, 831(78.2%) anterior and low anterior resections, 132(12.4%) in-tersphincteric resection with coloanal anastomosis, 98(9.3%) abdominoperineal resections and 1(0.1%) Hart-mann's operation were included in the review. Robotic rectal surgery was associated with longer operative time but with comparable oncological results and anastomotic leak rate when compared with laparoscopic rectal surgery. CONCLUSION: Robotic colorectal surgery has con-tinued to evolve to its current state with promising re-sults; feasible surgical option with low conversion rate and comparable short-term oncological results. The challenges faced with robotic surgery are for more high quality studies to justify its cost.

关键词： Rectal cancer Robotics Minimal invasive surgery Systematic review Rectal surgery

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Women's experiences of formula feeding their infants:an interpretative phenomenological study

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Frontiers of Nursing 2018年第1期5卷 49-59页

作者： Kin Yan Sze Zenobia chung yee Chan Vico chung Lim Chiang School of Nursing The Hong Kong Polytechnic University

Objective: This study aimed to explore the experiences of women in the process of formula feeding their infants. The World Health Organization has emphasized the importance of breastfeeding for infant health. After decades of breastfeeding promotions,breastfeeding rates in Hong Kong have been rising consistently; however, the low continuation rate is alarming. This study explores women's experiences with formula feeding their infants, including factors affecting their decision to do ***: A qualitative approach using an interpretative phenomenological analysis(IPA) was adopted as the study design. Data were collected from 2014 to 2015 through individual in-depth unstructured interviews with 16 women, conducted between 3 and 12 months after the birth of their infant. Data were analyzed using ***: Three main themes emerged as follows:(1) self-struggle, with the subthemes of feeling like a milk cow and feeling trapped;(2) family conflict, with the subtheme of sharing the spotlight; and(3) interpersonal tensions, with the subthemes of embarrassment,staring, and innocence. Many mothers suffered various stressors and frustrations during breastfeeding. These findings suggest a number of pertinent areas that need to be considered in preparing an infant feeding ***: The findings of this study reinforce our knowledge of women's struggles with multiple sources of pressure, such as career demands, childcare demands, and family life after giving birth. All mothers should be given assistance in making informed decisions about the optimal approach to feeding their babies given their individual situation and be provided with support to pursue their chosen feeding method.

关键词： formula feeding infant feeding breastfeeding feeding decision experience Qualitative interpretative phenom enological analysis women education support nurse nursing

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Hepatic adenoma mimicking a metastatic lesion on computed tomography-positron emission tomography scan

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World Journal of Gastroenterology 2013年第27期19卷 4432-4436页

作者： Darryl Lim Ser yee Lee Kiat Hon Lim chung Yip Chan Department of General Surgery Singapore General Hospital Department of Hepatopancreatobiliary and Transplant Surgery Singapore General Hospital Department of Surgical Oncology National Cancer Centre Duke-National University of Singapore (NUS) Graduate Medical School Department of Pathology Singapore General Hospital

Positron emission tomography (PET) using 18F-fluorodeoxyglucose ( 18F-FDG) is an imaging modality which reflects cellular glucose metabolism. Most malignant cells accumulate and trap 18F-FDG, allowing the visualisation of increased uptake. It is hence widely used to differentiate malignant from benign lesions. "False positive" findings of hepatic lesions have been described in certain instances such as hepatic abscesses, but are rare in cases involving hepatocellular adenomas. To our knowledge, there have been only 7 reports in the English literature documenting PET-avid hepatocellular adenomas; 6 of the 7 reports were published in the last 3 years with the first report by Patel et al. We report the case of a 44-year-old Chinese female patient with a history of cervical adenocarcinoma, referred for a hepatic lesion noted on a surveillance computed tomography (CT) scan. A subsequent CT-PET performed showed a hypermetabolic lesion (standardized uptake value 7.9) in segment Ⅳb of the liver. After discussion at a multidisciplinary hepato-pancreato-biliary conference, the consensus was that of a metastatic lesion from her previous cervical adenocarcinoma, and a resection of the hepatic lesion was performed. Histology revealed features consistent with a hepatocyte nuclear factor-1 α inactivated steatotic hepatocellular adenoma.

关键词： Hepatic adenoma Positron emission tomography 18F-fluorodeoxyglucose Hepatocellular adenoma Hepatocyte nuclear factor-1 α

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LOGISTICS SCHEDULING: ANALYSIS OF TWO-STAGE PROBLEMS

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Systems Science and Systems Engineering 2003年第4期12卷 385-407页

作者： Yung-Chia CHANG chung-yee LEE Davicom America Corporation 1135 Kern Avenue Sunnyvale CA 94085 U.S.A.Department of Industrial Engineering and Engineering Management Hong Kong University of Science & Technology Clear Water Bay Kowloon Hong Kong

This paper studies the coordination effects between stages for scheduling problems where decision-making is a two-stage process. Two stages are considered as one system. The system can be a supply chain that links two stages, one stage representing a manufacturer; and the other, a distributor It also can represent a single manufacturer, while each stage represents a different department responsible for a part of operations. A problem that jointly considers both stages in order to achieve ideal overall system performance is defined as a system problem. In practice, at times, it might not be feasible for the two stages to make coordinated decisions due to (i) the lack of channels that allow decision makers at the two stages to cooperate, and/or (ii) the optimal solution to the system problem is too difficult (or costly) to achieve.Two practical approaches are applied to solve a variant of two-stage logistic scheduling problems. The Forward Approach is defined as a solution procedure by which the first stage of the system problem is solved first, followed by the second stage. Similarly, the Backward Approach is defined as a solution procedure by which the second stage of the system problem is solved prior to solving the first stage. In each approach, two stages are solved sequentially and the solution generated is treated as a heuristic solution with respect to the corresponding system problem. When decision makers at two stages make decisions locally without considering consequences to the entire system, ineffectiveness may result - even when each stage optimally solves its own problem. The trade-off between the time complexity and the solution quality is the main concern. This paper provides the worst-case performance analysis for each approach.

关键词： Logistics scheduling worst case analysis dynamic programming

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基于流体动力学-离散单元耦合算法的海底滑坡动力学分析

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岩土力学 2019年第1期40卷 388-394页

作者：景路郭颂怡赵涛香港大学土木工程系四川大学水力学与山区河流开发保护国家重点试验室四川成都610065

采用计算流体动力学(CFD)和离散单元法(DEM)建立描述水与颗粒相互作用的耦合算法,用以分析海底滑坡的动力学特性。通过颗粒堆积体坍塌试验验证了模型的有效性。模拟分析了不同初始高宽比的水下坍塌过程,并与空气中的坍塌过程进行详细对... 详细信息

采用计算流体动力学(CFD)和离散单元法(DEM)建立描述水与颗粒相互作用的耦合算法,用以分析海底滑坡的动力学特性。通过颗粒堆积体坍塌试验验证了模型的有效性。模拟分析了不同初始高宽比的水下坍塌过程,并与空气中的坍塌过程进行详细对比。研究表明:该耦合算法可以较好地描述海底边坡的失稳、流动、堆积过程;水下滑坡体与水体会发生复杂的相互作用,在颗粒由垂直下落转为水平流出时,会在水中形成涡旋;在高宽比较大的情形下,水中涡旋会明显改变颗粒最终堆积的表面形态;水中滑坡的移动距离较小、堆积厚度较大、表面松散介质易受水流影响。

关键词：计算流体动力学离散单元法耦合海底滑坡

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The characterization and dissolution performances of spray dried solid dispersion of ketoprofen in hydrophilic carriers

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Asian Journal of Pharmaceutical Sciences 2015年第5期10卷 372-385页

作者： Siok-yee Chan Yin-Ying chung Xin-Zi Cheah Eryn Yen-Ling Tan Joan Quah School of Pharmaceutical Sciences Universiti Sains Malaysia11800 Pulau PinangMalaysia

Solid dispersion is one of the most promising strategies to improve oral bioavailability of poorly soluble ***,there are inconsistent dissolution performances of solid dispersion reported which entails further *** this study,solid dispersions of ketoprofen in three hydrophilic carriers,*** K30,PVPVA 6:4 and PVA were prepared and *** characterization of the physical mixture of ketoprofen and carriers shows certain extent of amorphization of the *** result is coinciding to evaluation of drug-polymer interaction using ATR-FTIR whereby higher amorphization was seen in samples with higher drug-polymer *** scanning confirms that fully amorphous solid dispersion was obtained for SD KTP PVP K30 and PVPVA system whereas partially crystalline system was obtained for SD KTP ***,dissolution profiles of the solid dispersion had shown that degree of amorphization of KTP was not directly proportional to the dissolution rate enhancement of the solid dispersion ***,it is concluded that complete amorphization does not guarantee dissolution enhancement of an amorphous solid dispersion system.

关键词： Solid dispersion Amorphous Polymer PVP PVPVA ketoprofen

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A ruptured recurrent small bowel gastrointestinal stromal tumour causing hemoperitoneum

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Frontiers of Medicine 2015年第1期9卷 108-111页

作者： Eric C.H. Lai Kam Man chung Stephanie H.Y. Lau Wan yee Lau Faculty of Medicine The Chinese University of Hong Kong Shatin Hong Kong SAR China Dr. K.M. chung's Clinic Rm 807 Hang Seng Tsimshatsui Building 18 Carnarvon Road Tsimshatsui Hong Kong SAR China Department of Surgery Pamela Youde Nethersole Eastern Hospital Hong Kong SAR China Department of Surgery Queen Elizabeth Hospital Hong Kong SAR China

Hemoperitoneum is a rare and potentially life-threatening complication of GIST. We reported a 54- year-old man who developed disseminated intra-abdominal recurrence from a previously resected gastrointestinal stromal tumour （GIST） of the small bowel, and the patient presented with hemoperitoneum. Emergent debulking surgery was performed. A high dose imatinib was prescribed. Despite the presence of residual disease, the patient was well clinically 8 months after the operation. Even though, there is no evidence to support the routine use of debulking surgery in the management of GIST. In our patient, disease progression after second line targeted therapy and the absence of alternative treatment options for spontaneous rupture and hemoperitoneum prompted us to treat the patient aggressively. Resection of the ruptured GIST was carried out for control of bleeding and to prevent recurrent bleeding in this patient with good surgical risks. During the treatment decision-making, the patient＇s general condition, the risk of surgery and the extent of dissemination were taken into consideration. In this patient who presented with spontaneous rupture of a small intestinal GIST, the novel use of targeted therapy and aggressive surgical treatment produced reasonably good survival outcome.

关键词： gastrointestinal stromal tumour hemoperitoneum small bowel GIST small bowel neoplasm imatinib

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Adult-onset immunodeficiency due to anti-interferon-gammaautoantibody in mainland Chinese

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Chinese Medical Journal 2014年第6期127卷 1189-1190页

作者： Jasper Fuk-Woo Chan kwok-Sang yee Bone Siu-Fai Tang Vincent Chi-chung Cheng Ivan Fan-Ngai Hung kwok-Yung Yuen State Key Laboratory of Emerging Infectious Diseases Department of Microbiology the University of Hong Kong Hong Kong China. Integrated Medical Services Kwong Wah Hospital Hong Kong China. Department of Pathology Hong Kong Sanatorium and Hospital Hong Kong China. Department of Microbiology Queen Mary Hospital Hong Kong China. Department of Medicine the University of Hong Kong Hong Kong China. State Key Laboratory of Emerging Infectious Diseases Department of Microbiology the University of Hong Kong Hong Kong China. Email: kyyuen@hkucc.hku.hk.

Immunodeficiency due to anti-interferon-gamma(anti-IFN-γ)autoantibody is an emerging adult-onsetimmunodeficiency syndrome associated with severeor disseminated infections caused by non-tuberculous

关键词： autoantibody iterferon gamma mycobacterium Penicillium marneffei erythema nodosum

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