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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

温度和水分对寒温带典型森林类型土壤有机碳矿化的影响

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东北林业大学学报 2025年第2期53卷 127-136页

作者：李雪朱宾宾满秀玲东北林业大学哈尔滨150040 内蒙古呼伦贝尔市林业和草原事业发展中心

通过室内模拟试验,分析寒温带典型森林土壤有机碳矿化随温度和水分的变化特征,揭示土壤有机碳矿化影响机制,以期深入探讨气候变暖背景下,温度和水分对寒温带典型森林类型土壤碳循环的影响。采集白桦林和兴安落叶松林0<h≤10 cm和10 cm<h... 详细信息

通过室内模拟试验,分析寒温带典型森林土壤有机碳矿化随温度和水分的变化特征,揭示土壤有机碳矿化影响机制,以期深入探讨气候变暖背景下,温度和水分对寒温带典型森林类型土壤碳循环的影响。采集白桦林和兴安落叶松林0h≤10 cm和10 cmh≤20 cm土层土壤(h),设计3个温度梯度(10、15、20℃)和3个水分梯度(30%、45%和60%)进行土壤碳矿化室内培养试验。结果表明:(1)两种林型0h≤20 cm土层土壤有机碳矿化速率均呈明显的单峰曲线变化趋势,峰值出现在培养后的4~6 d,白桦林土壤有机碳矿化速率峰值波动在13.38~77.47 mg·kg^(-1)·h^(-1),兴安落叶松林峰值波动在10.82~48.08 mg·kg^(-1)·h^(-1),白桦林土壤有机碳矿化速率高于兴安落叶松林,随培养时间延长矿化速率迅速降低,并趋于平缓;(2)两种林型土壤矿化速率和累积矿化量与温度和水分呈显著正相关。白桦林土壤有机碳矿化速率和累积矿化量在不同土层均高于兴安落叶松林,0h≤10 cm土层,白桦林在20℃培养时,3个水分梯度下的累积矿化量分别是兴安落叶松林的1.27、1.01、1.19倍,10 cmh≤20 cm土层分别是1.24、1.40、1.26倍;(3)两种林型土壤在温度从10℃升高到20℃时,温度敏感性(Q_(10))随水分增加而增加,且10 cmh≤20 cm土层Q_(10)值高于0h≤10 cm土层。寒温带典型森林类型土壤有机碳矿化受温度和水分的显著影响,土壤有机碳矿化速率随温度升高而加快,并伴随着森林碳排放量的增加。

关键词：寒温带白桦林兴安落叶松林土壤有机碳矿化温度敏感性

Twin-Pulse Soliton Operation of a Fiber Laser

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光学学报 2003年第S1期23卷 585-586页

作者： W. S. man h. y. Tam Department of Electrical Engineering Hong Kong Polytechnic University Hong KongDepartment of Electrical Engineering Hong Kong Polytechnic University Hong Kong

We report on the experimental observation of a novel type of twin-pulse soliton in a passively mode-locked fiber ring laser. Twin-pulse soliton interaction in the laser cavity are also experimentally investigated and ... 详细信息

关键词： Twin-Pulse Soliton Operation of a Fiber Laser it on as of mode

Formation of TiN Grid on NiTi by Laser Gas Nitriding for Improving Wear Resistance in hanks' Solution

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Journal of Materials Science & Technology 2016年第5期32卷 459-464页

作者： C.h.Ng O.K.Chan h.C.man Department of Industrial and Systems Engineering The Hong Kong Polytechnic University

Laser gas nitriding （LGN） is a common surface modification method to enhance the wear resistance of titanium （Ti） alloys, which are known to have poor tribological properties. In the present study, a titanium nitride （TIN） grid network was fabricated on the surface of nickel titanium （NiTi） by LGN. The laser processing parameters were selected to achieve nitriding without surface melting and hence to＇maintain a smooth surface finish. The characteristics of the grid-nitrided samples were investigated by scanningelectron microscopy, X-ray diffractometry, optical microscopy, 2-D profilometry, contact angle measurements and nanoindentation. The wear resistance of the nitrided samples was evaluated using reciprocating wear test against ultra-high-molecular-weight polyethylene （UhMWPE） in hanks＇ solution. The results indicate that the wear rates of the grid-nitrided samples and the UhMWPE counter-body in the wear pair are both significantly reduced. The decrease in wear rates can be attributed to the combination of a hard TiN grid and a soft NiTi substrate. In hanks＇ solution, the higher hydrophilicity of the nitrided samples also contributes to the better performance in wear test against hydrophobic UhMWPE.

关键词： Laser Nitriding Surface patterning Titanium alloys Wear

Laser additive manufacturing of biodegradable Mg-based alloys for biomedical applications: A review

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Journal of Magnesium and Alloys 2022年第4期10卷 915-937页

作者： C.L.Wu W.J.Xie h.C.man Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Metallic implants are widely used in internal fixation of bone fracture in surgical *** are mainly used for providing mechanical support and stability during bone reunion,which usually takes a few months to *** implants made of stainless steels,Ti-based alloys and CoCrMo alloys have been widely used for orthopedic reconstruction due to their high strength and high corrosion *** metallic implants will remain permanently inside the body after implantation,and a second surgery after bone healing is needed because the long-term presence of implant will lead to various *** implant removal surgery not only incurs expenditure,but also risk and psychological *** a consequence,studies on the development of biodegradable implants,which would degrade and disappear in vivo after bone reunion is completed,have drawn researchers’*** this connection,Mg-based alloys have shown great potentials as promising implant materials mainly due to their low density,inherent biocompatibility,biodegradability and mechanical properties close to those of ***,the high degradation rate of Mg-based implants in vivo is the biggest hurdle to *** from materials selection,a fixation implant is ideally tailor-made in size and shape for an individual case,for best surgical ***,laser additive manufacturing(LAM),with the advent of sophisticated laser systems and software,is an ideal process to solve these *** this paper,we reviewed the progress in LAM of biodegradable Mg-based alloys for biomedical *** effect of powder properties and laser processing parameter on the formability and quality was thoroughly *** microstructure,phase constituents and metallurgical defects formed in the LAMed samples were *** mechanical properties,corrosion resistance,biocompatibility and antibacterial properties of the LAMed samples were summarized and compared with samples fabricated by

关键词： Laser additive manufacturing Magnesium alloys Implant Biomedical applications Mechanical properties Biodegradability

Nature of Surface Layer and Electrochemical Behavior of NaOh hydrothermally Treated NiTi Alloy

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Journal of Materials Science & Technology 2004年第2期20卷 185-188页

作者： P.Shi F.T.Cheng h.C.man DepartmentofAppliedPhysics TheHongKongPolytechnicUniversityHongKongChina DepartmentofIndustrialandSystemsEngineering TheHongKongPolytechnicUniversityHongKongChina

NiTi samples were hydrothermally treated in NaOh at 200℃ with different soaking times. The morphology of the surface layer formed was studied by scanning electron microscopy (SEM). The composition of the layer and the major phases present were determined by energy-dispersive spectroscopy (EDS) and X-ray diffractometry (XRD), respectively. In contrast to the results reported by some authors, the surface layer was essentially Ni(Oh)2 instead of being TiO2. The electrochemical behavior of the samples was studied by electrochemical impedance spectroscopy (EIS) in 3.5% NaCl solution at 23℃, and analyzed using a simplified Randle circuit consisting of a resistance R and a capacitance C in parallel. After hydrothermal treatment, R was increased by a factor ranging from 1.5 to 5.0 times, depending on the treatment time. The value of R of all the samples became steady within a period of less than 15 h. Results of the present study indicate that alkaline treatment leads to the growth of an insulating layer on NiTi, but the method is not suitable for surface modification of NiTi implants due to the enhanced Ni content in the surface layer.

关键词： hydrothermal treatment NiTi NaOh Resistance Electrochemical impedance spectroscopy

Interaction of Plasma Proteins with Tri-quaternary Ammonium Salt Cationic Surfactant Studied by QCM-D

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Chinese Journal of Chemistry 2015年第2期33卷 253-260页

作者： man Xi Baoyan Zhang Research Center for Molecular Science and Engineering Northeastern UniversityShenyangLiaoning 110819China

A tri-quaternary ammonium salt cationic surfactant was *** structure was confirmed by using Fourier-transform infrared spectroscopy,^(1)h nuclear magnetic resonance spectroscopy,and X-ray photoelectron spectroscopy *** model surfaces,including Au-Ch_(3),Au-Oh and Au-COOh,were *** of surfactant on the three model surfaces and subsequent plasma proteins adsorption were investigated by quartz crystal microbalance with dissipation(QCM-D).The mass of surfactant on the Au-COOh surface was the largest,followed by that on the Au-Ch_(3)surface,and that on the Au-Oh *** results suggested that the main driving force of surfactant immobilization was electrostatic interaction followed by hydrophobic *** on the results obtained,we concluded that the protein mass adsorbed on Au-Ch_(3)-S,Au-Oh-S,and Au-COOh-S surfaces depended on the protein size and *** mass and thickness of S on the Au-COOh surface is the largest and the protein adsorption capacity of Au-COOh-S surface is inferior to that of Au-Ch_(3)-*** Au-COOh-S surface could inhibit lysozyme adsorption,maintain the adsorption balance of bovine serum albumin,and induce fibrinogen-binding protein adsorption.

关键词： tri-quaternary ammonium salt cationic surfactant self-assembled monolayers quartz crystal micro-balance with dissipation(QCM-D) proteins adsorption

Investigation of the shortest period Am type eclipsing binary TyC 6408–989–1

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Research in Astronomy and Astrophysics 2021年第3期21卷 107-116页

作者： Xiao-man Tian School of Aeronautics Shandong Jiaotong University Jinan 250000China Center for Astronomical Mega-Science Chinese Academy of Sciences Beijing 100101China

The first BV bands photometric observations and the low-resolution spectrum of the shortest period Am type eclipsing binary TyC 6408-989-1 have been *** stellar atmospheric parameters of the primary star were obtained through the spectral fitting as follows:Teff=6990±117 K,log g=4.25±0.26 cm s^(-2),[Fe/h]=-0.45±0.03 *** original spectra obtained by European Southern Observatory(ESO)were processed with an IRAF package by *** on the ESO blue-violet spectra,TyC 6408-989-1 was concluded as a marginal Am(Am:)star with a spectral type of kA3 hF1 mA5Ⅳ-Ⅴidentified through the MKCLASS *** observed light curves were analyzed through the WilsonDevinney *** final photometric solutions show that TyC 6408-989-1 is a marginal contact binary with a low mass ratio(q=0.27).The temperature of the secondary component derived through the light curve analysis is significantly higher than main sequence *** addition,TyC 6408-989-1 is a poor thermal contact *** temperature differences between the two components is about 1800 ***6408-989-1 should be located in the oscillation stage predicted by the thermal relaxation oscillations theory(TRO)and will evolve into the shallow contact stage *** very short period(less than one day),marginal Am peculiarity and quite large rotational velocity(v sin i■160 km s^(-1))make TyC 6408-989-1 become a challenge to the cut-off of rotation velocities and periods of Am *** have collected the well known eclipsing Am binaries with absolute parameters from the literature.

关键词： stars:chemically peculiar stars:binaries:eclipsing stars:binaries:general(TyC 64089891) stars:evolution

The effect of the Ce content on the oxidative dehydrogenation of propane over CrOy-CeO2/γ-Al2O3 catalysts

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Chinese Journal of Chemical Engineering 2020年第12期28卷 3035-3043页

作者： Cheng Zuo man Wu Qingjie Guo Key Laboratory of Clean Chemical Processing of Shandong Province College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China State Key Laboratory of high-efficiency Coal Utilization and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China

A series of CrOy(17.5 wt%)-CeO2(X wt%)/γ-Al2O3 catalysts(X=0,0.5,2,5,8)with various Ce contentswere prepared by a wetness impregnation method and were applied to the dehydrogenation of propane to propylene at 550℃ and 0.1 *** prepared catalysts were characterized by BET,h2-TPR,O2-TPD,XPS,XRD,SEM-EDS and Raman *** the prepared catalysts,the 17.5Cr-2Ce/Al catalyst with the largest amount of lattice oxygen exhibited the best catalytic performance for the dehydrogenation of propane to propylene with lattice *** decreased presence of oxygen defects and reducibility were the factors responsible for the improved dehydrogenation activity of the *** CeO2 layer could inhibit the evolution of lattice oxygen(O2^−)to electrophilic oxygen species(O2^−),and the oxygen defects on the catalyst surfacewere *** inhibited lattice oxygen evolution prevented the deep oxidation of propane or propylene,the average COx selectivity decreased from 24.41%(17.5Cr/Al)to 5.71%(17.5Cr-2Ce/Al),and the average propylene selectivity increased from 60.15%(17.5Cr/Al)to 85.05%(17.5Cr-2Ce/Al).

关键词： Oxidation Selectivity Propane Propylene Fluidized-bed Oxygen carrier