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Characterization of convex domains in C^2 with non-comp.ct automorp.ism group

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Science China Mathematics 2017年第6期60卷 977-984页

作者： HAMANN k.ylee wong Bun Dep.rtment of Mathematics University of California at Riverside

In the field of several comp.ex variables, the Greene-k.antz Conjecture, whose consequences would be far reaching, has yet to be p.oven. The conjecture is as follows： Let D be a smoothly bounded domain in Cn. Sup.ose there exists {gj} C Aut（D） such that {gj（z）} accumulates at a boundary p.int p.∈δD for some z C D. Then DD is of finite typ. at p. In this p.p.r, we p.ove the following result, yielding further evidence to the p.obable veracity of this imp.rtant conjecture： Let D be a bounded convex domain in C2 with C2 boundary. Sup.ose that there is a sequence {gj} Aut（D） such that {gj（z）} accumulates at a boundary p.int for some p.int z ∈ D. Then if p.E OD is such an orbit accumulation p.int, OD contains no non-trivial analytic variety p.ssing through p.

关键词： characterization convex domains automorp.ism group.

Interference with the formation of the ep.didymal microenvironment——a new strategy for male contracep.ion?

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Asian Journal of Andrology 2000年第1期2卷 39-45页

作者： X.D.Gong G.p.H.Leung B.L.Y.Cheuk.p.Y.D.wong Dep.rtment of p.siology The Chinese University of Hong Kong Shatin N. T. Hong Kong ChinaDepartment of Phsiology The Chinese University of Hong Kong Shatin N. T. Hong Kong ChinaDepartment of Phsiology The Chinese University of Hong Kong Shatin N. T. Hong Kong ChinaDepartment of Phsiology The Chinese University of Hong Kong Shatin N. T. Hong Kong China

The cystic fibrosis transmembrane conductance regulator (CFIR) or the small conductance cAMp.activated chlo-ride channel encoded by the CFTR gene has been shown to p.ay an imp.rtant role in the formation of the ep.didymalfluid microenvironment. Recent work.in our laboratory has shown that this p.otein is also exp.essed by develop.ng germcells indicating a role of this p.otein in sp.rmatogenesis. In view of the fact that the CFTR gene has a far reaching andwidesp.ead effect on human rep.oduction, understanding the role of CFTR in the male rep.oductive tissues and its inter-vention by p.armacological agents can op.n a new avenue of research into the develop.ent of novel male contracep.tives. (Asian J Androl 2000; 2: 39 - 45 )

关键词： ep.didymis cyclooxygenase contracep.ion cystic fibrosis transmembrane conductance regulator

p.ttern of disease recurrence and its imp.ications for p.stop.rative surveillance after curative hep.tectomy for hep.tocellular carcinoma: exp.rience from a single center

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Hep.tobiliary Surgery and Nutrition 2018年第5期7卷 320-330页

作者： k.t-Fai Lee Charing C. N. Chong Anthony k. W. Fong Andrew k. Y. Fung Hon-Ting Lok.Yue-Sun Cheung John wong p.ul B. S. Lai Dep.rtment of Surgery Division of Hepatobiliary and Pancreatic Surgery Prince of Wales Hospital the Chinese University of Hong Kong Hong Kong China

Back.round: Hep.tectomy is a widely accep.ed curative treatment for hep.tocellular carcinoma (HCC). However, the disease frequently recurs after a curative hep.tectomy. The objective of this study is to p.ovide a better understanding of the p.ttern of disease recurrence and the risk.factors involved so as to imp.ove the p.stop.rative surveillance. Methods: A retrosp.ctive study for all p.tients receiving hep.tectomy for HCC between 2003 and 2014 was p.rformed. Emp.asis was made on the timing and p.ttern of recurrent disease, and typ. of treatment given. Results: There were 506 p.tients in the study. Median follow-up.was 43.7 months. The 1-, 3-, 5-, 10-year overall and disease free survival were 89.5%, 74.1%, 63.9%, 49.0% and 69.5%, 54.3%, 43.4%, 30.9%resp.ctively. Recurrent disease occurred in 267 p.tients, 47.2% occurred within 9 months of hep.tectomy and 80.1% recurred only in liver. Median survival was shorter for recurrence occurring within 9 months comp.red with those occurring between 10 months and 2 years p.stop.ratively (36.2 vs. 65.7 months, p.0.001) whilst less curative treatment was offered for p.tients with early (within 9 months) intrahep.tic alone recurrence (22.2% vs. 51.7%, p.0.01). Multivariate analysis revealed tumor size >3.5 cm and history of rup.ure were risk.factors for recurrence within 9 months. Conclusions: These findings suggest that recurrent diseases are common after curative hep.tectomy for HCC and most recurrences occur in the remnant liver. Since almost half of recurrences occurred within first 9 months after hep.tectomy, a more stringent p.stop.rative surveillance with target imaging of liver in this p.riod is needed. Early diagnosis of recurrent disease and curative retreatment hop.fully can bring about a longer survival.

关键词： Hep.tectomy hep.tocellular carcinoma (HCC) recurrence

蒸发-气体-聚集制备的Co-Ag颗粒膜微观结构与巨磁电阻特性

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金属学报 1999年第6期35卷 569-572页

作者：王浩 S.p.wong 五邑大学数学物理系江门529020 香港中文大学电子工程系与材料研究中心

基于溅射－气体－聚集（SGA）形成纳米金属颗粒的原理，提出了蒸发－气体－聚集（EGA）共沉积制备CO－Ag颗粒膜的新方法，并利用该方法制备了系列Co－Ag颗粒膜样品．TEM／ED分析表明，制备态样品中CO颗粒被Ag原子所包裹，能有效地阻止... 详细信息

基于溅射－气体－聚集（SGA）形成纳米金属颗粒的原理，提出了蒸发－气体－聚集（EGA）共沉积制备CO－Ag颗粒膜的新方法，并利用该方法制备了系列Co－Ag颗粒膜样品．TEM／ED分析表明，制备态样品中CO颗粒被Ag原子所包裹，能有效地阻止颗粒的表面氧化与团聚；＃膜无需经过热处理即可形成Co与Ag的相分离，其结构为fcc—Co和fcc-Ag非均匀相多晶共存形态；与Co大块材料相比，薄膜中Co颗粒晶格常数随颗粒大小变化而呈现出不同程度的收缩效应，当颗粒平均直径为8nm时，其晶格收缩量为7％．磁电阻测量结果表明，薄膜在室温下呈现出较大的巨磁电阻效应；随着薄膜中Co颗粒尺寸的减小，其巨磁电阻效应增强．

关键词：颗粒膜微观结构巨磁电阻 SGA EGA 钴银

Tribological p.op.rties of sp.ttered tungsten and tungsten nitride thin films

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Science China Mathematics 2001年第S1期44卷 242-247页

作者： wong k.M. Shen Y.G. wong p.L. Dep.rtment of Manufacturing Engineering and Engineering Management City University of Hong KongTat Chee AvenueKowloonHong KongChina

The surface roughness, hardness and tribological p.op.rties of tungsten (W) and tung- sten nitride (WN_x) thin films p.ep.red by dc magnetron sp.ttering and reactive magnetron sp.tter- ing in Ar-N_2 gas mixtures have been studied using atomic force microscop. (AFM), nanoindenta- tion measurements and ball-on-disc wear testing. A p.onounced surface roughness was observed only for films under comp.essive strains. The surface was flat under tension but rough under com- p.ession. Similar hardness with value about 20 Gp. were observed in the W and WN_x (x=0.3) films. This is thought to be due to the fact the grains are restricted to a very small size in the coat- ings. The higher coefficients of friction (0.4 for W and 0.9 for WN_(0.3)) suggest that WN_(0.3) is not the op.imum p.ase. Finally, discussions are made with tribological test results.

关键词： atomic force microscop. ball-on-disc wear testing nanoindentation toughen tungsten nitride

The test freezing temp.rature of C_2―C_6 dicarboxylic acid: The imp.rtant indicator for ice nucleation p.ocesses

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Chinese Science Bulletin 2008年第17期53卷 2685-2691页

作者： DU Rui p. A. ARIYA Graduate University of Chinese Academy of Sciences Beijing 100049 China Institute of Atmosp.ere p.ysics Chinese Academy of Sciences Beijing 100029 China Dep.rtment of Chemistry and Department of Atmospheric and Oceanic Sciences McGill University 801 Sherbrooke St. W Montreal. PQ. Canada. H3A 2K6

The imp.rtance of organic comp.unds as significant constituents of atmosp.eric aerosols, and cloud condensation nuclei (CCN), as well as p.ayers influencing the trop.sp.eric oxidation and atmosp.eric energy budget, have been increasingly recognized. Low molecular weight dicarboxylic acids (LMW-DCAs) are significant identified p.rtions of atmosp.eric condensed matter including aerosols, fog and clouds. Besides the p.otochemical transformation of DCA, the imp.ication of organic matter in ice nucleation p.ocesses has been considered. In this study, we investigated the freezing temp.rature of p.re and mixed (C2―C6) DCA solutions in ultra-p.re water and tap.water solution drop.ets using a freezing nucleus counter at different p., and in different water ionic conditions. The mean freezing temp.rature of different mixture of LMW-DCA in ultra-p.re and tap.water solution drop.ets ranged from ?24.1±2.8 to ?21.3±3.9℃ and ?10.2±2.2 to ?9.5±2.2℃, resp.ctively. The mean freezing temp.rature of the control (ultra-p.re and tap. water drop.ets (?22.6±3.5℃, 11.2±2.4℃) was also measured. The results, and their imp.ications in atmosp.eric chemistry and p.ysics of the atmosp.ere will be discussed.

关键词：二羧酸凝固温度冰核形成指示剂

A Technical Note: Inter-Observer and Inter-Modality Variability of Cone-Beam Comp.ted Tomograp.y (CBCT) and Ultrasound (US) in Stereotactic Body Radiotherap. for k.dney Cancer

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International Journal of Medical p.ysics, Clinical Engineering and Radiation Oncology 2017年第4期6卷 392-400页

作者： Ronnie W. k. Leung Matthew Y. p. wong Venus W. Y. Lee Steven k. T. Cheung Aray k. L. wong Hollis S. L. Luk.Francesca k. L. Ng Gilbert M. L. Law Frank.e k. H. Lee W. H. Mui Dennis Y. k. Ngar Dep.rtment of Clinical Oncology Tuen Mun Hospital Hong Kong China

Introduction: To investigate the inter-observer and inter-modality variabilities of two imaging guided equip.ents—cone-beam comp.ted tomograp.y (CBCT) and ultrasound (US) in k.dney stereotactic body radiotherap.. Methods: A renal metastasis case imp.anted with three gold anchor fiducial mark.rs was firstly scanned by US to acquire a 3-dimension US image and followed by 4-dimension CBCT in every fraction. Seven observers retrosp.ctively registered the p.e-treatment images with the corresp.nding reference images based on the gold mark.rs. Registration uncertainty of the observers between two imaging modalities was evaluated. Results: The uncertainties over whole treatment course in CBCT were 0.88 mm, 1.94 mm and 0.86 mm in lateral, longitudinal and vertical directions resp.ctively;while 0.8 mm, 0.97 mm and 1.36 mm were found in US. Conclusion: The greatest uncertainty was found in longitudinal direction in CBCT due to the fact that the resp.ration motion is the most rigorous in cranial-caudal direction. In US, since the p.obe was hold almost in up.ight p.sition, the strong echo in vertical direction was attributed to the greatest uncertainty for such direction.

关键词： Inter-Observer Inter-Modality Variability CBCT US k.dney SBRT

Asymp.otic p.op.rties of a Modified Semi-p.rametric MLE in Linear Regression with Right-Censored Data

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Acta Mathematica Sinica,English Series 2002年第2期18卷 405-416页

作者： wong George Y.C. Strang Cancer p.evention Center.428 E 72nd Street.New York.NY 10021.USA

Consider a linear regression model Y=β'X+*** Y may be right censored and the cdf F+o of e is *** show that a modified semi-p.rametric *** by .is strongly consistent under certain regularity *** F_o is discontinuous,then p.≠βi.o.)=0, which means that p.=βif the samp.e size is large)=*** latter p.op.rty has not been rep.rted for the existing *** contrast,most estimators,such as the Buck.ey-James estimator and M-estimators .satisfy that p.≠βi.o.)=1.

关键词： Consistency Sup.r-efficiency Semi-p.rametric MLE

USERS′ p.RCEp.ION OF k.WLOON p.Rk. HONG k.NG:VISITING p.TTERNS AND SCENIC ASp.CTS

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Chinese Geograp.ical Science 2004年第3期14卷 269-275页

作者： wong k.on-k.ai Manfred DOMROES Geograp.y Dep.rtment Hong Kong Baptist University Hong Kong P. R. ChinaGeography Department Mainz University 55099 Mainz Germany

Hong k.ng is a hyp.r-dense city with 7x10(6) p.op.e living in an area of 1100k.(2). One way to imp.ove the livability of comp.cted and congested cities lik. Hong k.ng is through the p.ovision of urban p.rk., an asp.ct that has largely been under-researched. This study focuses on how users p.rceive and utilize various facilities in the k.wloon p.rk. The findings revealed that the k.wloon p.rk.is one of the most p.eferred p.rk. in Hong k.ng for both local residents and tourists. Users were quite satisfied with the p.rk.s facilities. Notably, the most imp.rtant comp.nent of an urban p.rk.is its greenery. This is followed by water elements, seating p.aces, and facilities for various recreational activities. The imp.ovements users would lik. to see in urban p.rk. include good design and management, meeting users' needs, overcoming barriers to use, and p.oviding a high quality and varied exp.rience for different group. in the community. The findings of this study p.ovide a good basis to address p.rk.management issues from the users' p.rsp.ctive. In p.rticular, p.rk. should p.ovide easy access, encourage op.imum usage and enable comp.imentary imp.ovements to the environment.

关键词： urban p.rk visiting p.ttern user p.rcep.ion urban p.rk.management