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49篇 您的检索式:作者名="LIU Xinguang"
    题名 作者 年代 出处 被引量
1低剂量三联疗法根除幽门螺杆菌的多中心临床研究显示文摘本研究对根除幽门螺杆菌(Hp)的三联疗法进行改良,减少其中阿莫西林及甲硝唑的剂量,对Hp阳性的173例慢性胃炎患者及267例十二指肠溃疡患者进行Hp根除治疗。用药方法为胶体次枸橼酸铋(德诺,CBS)120mg,阿莫西林250mg,及甲硝唑200mg同服,每日4次,连服14天,Hp根除率为86.8%。此外,对49例慢性胃炎及107例十二指肠溃疡Hp阳性者减少服药次数,采用每日2次给药,连服14天,Hp根除率89.1%。研究证明,低剂量三联疗法Hp根除率高,不良反应少,有较好的依从性。每日2次服药与每日4次服药临床疗效相似,Hp根除率差异无显著性(P>0.05)。Liu Xinguang,Jia Boqi.Department of Gastroenterology, FirstTeaching Hospital, Beijing Medical University, Beijing l00034 1996中华消化杂志1996,16,4:36
2Double role of Fas ligand in the apoptosis of intervertebral disc cells in vitro显示文摘船边交货 ligand (FasL ) 可以在维持 intervertebral 圆盘(IVD ) 的有免疫力的特权起一个重要作用。而且,它是仔细与退化圆盘房间的 apoptosis 有关。现在,大量报告关于 FasL 的矛盾的效果描述了,尽管 IVD 房间上的 FasL 的效果仍然在争论下面。在这研究,我们试着在船边交货表示上并且在原子核 pulposus (NP ) 的 apoptosis 上调查 FasL 的效果在 SpragueDawley 老鼠的房间。结果证明在 NP 房间的船边交货的表示被 recombinant FasL 显著地增加。同时, NP 房间的 apoptosis 以一种 FasL 剂量依赖者方式显著地增加了。有趣地, RNA 干扰结果显示船边交货表示和以前描述的 NP 房间 apoptosis 的增加被船边交货 siRNA 禁止,建议 RNA 干扰可能是阻止 IVD 房间 apoptosis 的新奇策略之一。Dunfu Han Yue Ding Shang-Li Liu Gang Wang In-Cheong Si Xinguang Wang Liyang Cui Dongshang Huang 2009Acta Biochimica et Biophysica Sinica2009,41,11:14
3Outcome of multimodal MRI-guided intravenous thrombolysis in patients with stroke with unknown time of onset显示文摘Objective Intravenous tissue plasminogen activator(tPA)is the standard therapy for patients with acute ischaemic stroke(AIS)within 4.5 hours of onset.Recent trials have expanded the endovascular treatment window to 24 hours.We investigated the efficacy and safety of using multimodal MRI to guide intravenous tPA treatment for patients with AIS of unknown time of onset(UTO).Methods Data on patients with AIS with UTO and within 4.5 hours of onset were reviewed.Data elements collected and analysed included:demographics,National Institutes of Health Stroke Scale(NIHSS)score at baseline and 2 hours,24 hours,7 days after thrombolysis and before discharge,the modified Rankin Scale(mRS)score at 3 months after discharge,imaging findings and any adverse event.results Forty-two patients with UTO and 62 in control group treated within 4.5 hours of onset were treated with intravenous tPA.The NIHSS scores after thrombolysis and/or before discharge in UTO group were significantly improved compared with the baseline(p<0.05).Between the two groups,no significant differences in NIHSS score were observed(p>0.05).Utilising the non-inferiority test,to compare mRS scores(0-2)at 3 months between the two groups,the difference was 5.2%(92%CI,OR 0.196).Patients in the UTO group had mRS scores of 0-2,which were non-inferior to the control group.Their incidence of adverse events was similar.Conclusions Utilising multimodal MRI to guide intravenous only thrombolysis for patients with AIS with UTO was safe and effective.In those patients with AIS between 6 and 24 hours of time of onset but without large arterial occlusion,intravenous thrombolysis could be considered an option.Jie Zhao Hongmei Zhao Runtao Li Jiangtao Li Chang Liu Juan Lv Yanan Li Wei Liu Dongpu Ma Huaihai Hao Xinguang Xiao Junzhong Liu Yongfeng Yin Rongli Liu Qiaoyan Yu Yingjie Wei Pengyan Li Yue Wang Runqing Wang 2019Stroke & Vascular Neurology2019,4,1:8
435 W continuous-wave Ho:YAG single-crystal fiber laser显示文摘We report on a high-power Ho:YAG single-crystal fiber(SCF)laser inband pumped by a high-brightness Tm-fiber laser at 1908 nm.The Ho:YAG SCF grown by the micro-pulling-down technique exhibits a propagation loss of 0.05±0.005 cm^-1 at 2.09μm.A continuous-wave output power of 35.2 W is achieved with a slope efficiency of 42.7%,which is to the best of our knowledge the highest power ever reported from an SCF-based laser in the 2µm spectral range.Yongguang Zhao Li Wang Weidong Chen Jianlei Wang Qingsong Song Xiaodong Xu Ying Liu Deyuan Shen Jun Xu Xavier Mateos Pavel Loiko Zhengping Wang Xinguang Xu Uwe Griebner Valentin Petrov 2020High Power Laser Science and Engineering2020,8,2:7
5Correlation analysis between the chemical contents and bioactivity for the quality control of Alismatis Rhizoma显示文摘In order to clarify regions of production and to discriminate processing methods, quantitative and qualitative analyses for saccharides and terpenes in 35 batches of Alismatis Rhizoma were performed.Methodologies included HPLC–PDA, HPLC–VWD and UHPLC–MSn, combined with principal component analysis(PCA) and partial least squares regression techniques(PLSR). The inhibitory effects of triterpenes and Alismatis Rhizoma extracts on lipase activity were evaluated in vitro. PLSR analysis revealed significant positive correlations(R2= 0.5795) between the contents of triterpenes 10, 14, 15, 18 and 22 and the inhibitory effects of Alismatis Rhizoma. The present study establishes an effective method for simultaneous determination of multiple components, and identifies key bioactive triterpenes. These results can be used for systematic and novel analytical strategies for the quality control of Alismatis Rhizoma production.Xiaoxv Gao Chengpeng Sun Zhenglong Yu Jian Cang Xiangge Tian Xiaokui Huo Lei Feng Xinguang Liu Chao Wang Baojing Zhang Xiaochi Ma 2018Acta Pharmaceutica Sinica B2018,8,2:4
6Association between plasma brain natriuretic peptide/N-terminal pro-brain natriuretic peptide levels and atrial fibrillation: evidence from a meta-analysis显示文摘Liu Yaowu Xiao Yunyun Chen Xinguang Zhang Fengxiang 2014Chinese Medical Journal2014,,15:4
7Effect of thermal exposure on the microstructure and creep properties of a fourth-generation Ni-based single crystal superalloy显示文摘The effect of thermal exposure on microstructure and creep properties of a fourth-generation nickelbased single crystal superalloy was investigated.The thermal exposure of samples after the full heat treatment was carried out at 1000℃,1100℃ and 1140℃ for 100 h and 200 h.The γ’ coarsening,γ’ rafting and γ channel widening were observed in samples after thermal exposure.When the thermal exposure time was constant,the morphology of γ’ phase in the alloy evolved significantly with increasing aging temperature.The interracial dislocation networks in aged samples after creep ruptured gradually became irregular and sparse with the increase of exposure temperature.When the higher exposure temperature was used,enla rgement of the defect pores was observed in samples,the microcracks were more likely to initiate and propagate at the corner of these pores.After aging at 1000℃ for 100 h,the creep life at 1140℃/137 MPa was slightly longer than that of heat-treated sample,which could be attributed to the slightly coarsened γ’ phase,homogenization of refractor elements.In contrast,the creep life of sample exposed at 1140℃ for 100 h was greatly decreased.The decrease of creep life was dominated by the rafting of γ’phase,the irregular interfacial dislocation networks as well as the enlargement of homogenization pores.Yeshun Huang Xinguang Wang Chuanyong Cui Zihao Tan Jinguo Li Yanhong Yang Jinlai Liu Yizhou Zhou Xiaofeng Sun 2021Journal of Materials Science & Technology2021,,10:4
8Structured laser beams: toward 2-μm femtosecond laser vortices显示文摘Structured ultrashort-pulse laser beams, and in particular eigenmodes of the paraxial Helmholtz equation, are currently extensively studied for novel potential applications in various fields, e.g., laser plasma acceleration,attosecond science, and fine micromachining. To extend these prospects further, in the present work we push forward the advancement of such femtosecond structured laser sources into the 2-μm spectral region. Ultrashortpulse Hermite– and Laguerre–Gaussian laser modes both with a pulse duration around 100 fs are successfully produced from a compact solid-state laser in combination with a simple single-cylindrical-lens converter. The negligible beam astigmatism, the broad optical spectra, and the almost chirp-free pulses emphasize the high reliability of this laser source. This work, as a proof of principle study, paves the way toward few-cycle pulse generation of optical vortices at 2 μm. The presented light source can enable new research in the fields of interaction with organic materials, next generation optical detection, and optical vortex infrared supercontinuum.Yongguang Zhao Li Wang Weidong Chen Pavel Loiko Xavier Mateos Xiaodong Xu Ying Liu Deyuan Shen Zhengping Wang Xinguang Xu Uwe Griebner Valentin Petrov 2021Photonics Research2021,9,3:3
9Microstructure evolution and mechanical behavior of Ni-based single crystal superalloy joint brazed with mixed powder at elevated temperature显示文摘Brazing of a Ni-based single crystal superalloy has been investigated with the additive Ni-based superalloy and filler Ni–Cr–W–B alloy at 1260℃, and attentions were paid to the microstructure evolution during brazing and the stress-rupture behavior at 980℃ of such brazed joints after homogenization. Microstructure in the brazed joint generally includes brazing alloy zone(BAZ), isothermally solidified zone(ISZ) and diffusion affected zone(DAZ). Microstructure evolution during this brazing process is discussed at the heating stage, the holding stage and the cooling stage respectively, according to the diffusion path of B atoms. Initially well-distributed γ’/γ’ microstructure in the homogenized bonded zone after heat treatment and substantial γ’ rafts enhance the post-brazed joint to obtain a stress-rupture lifetime of more than 120 h at 980℃/250 MPa. On the other hand, the decreased stress-rupture behavior of post-brazed joint, compared with parenting material, is ascribed to the presence of inside brazing porosity and stray grain boundary, which not only reduces the effective loading-carrying area but also offers preferential sites for creep vacancy aggregation to further soften stray grain boundary. And finally an early fracture of these post-brazed joints through the intergranular microholes aggregation and growth mode under this testing condition was observed.Guanglei Wang Yuan Sun Xinguang Wang Jide Liu Jinlai Liu Jinguo Li Jinjiang Yu Yizhou Zhou Tao Jin Xudong Sun Xiaofeng Sun 2017Journal of Materials Science & Technology2017,33,10:2
10Detecting network intrusions by data mining and variable-length sequence pattern matching显示文摘Anomaly detection has been an active research topic in the field of network intrusion detection for many years. A novel method is presented for anomaly detection based on system calls into the kernels of Unix or Linux systems. The method uses the data mining technique to model the normal behavior of a privileged program and uses a variable-length pattern matching algorithm to perform the comparison of the current behavior and historic normal behavior, which is more suitable for this problem than the fixed-length pattern matching algorithm proposed by Forrest et al. At the detection stage, the particularity of the audit data is taken into account, and two alternative schemes could be used to distinguish between normalities and intrusions. The method gives attention to both computational efficiency and detection accuracy and is especially applicable for on-line detection. The performance of the method is evaluated using the typical testing data set, and the results show that it is significantly better than the anomaly detection method based on hidden Markov models proposed by Yan et al. and the method based on fixed-length patterns proposed by Forrest and Hofmeyr. The novel method has been applied to practical hosted-based intrusion detection systems and achieved high detection performance.Tian Xinguang Duan Miyi Sun Chunlai Liu Xin 2009Journal of Systems Engineering and Electronics2009,20,2:2
11Urban structure and the risk of influenza A(H1N1) outbreaks in municipal districts显示文摘Changsha was one of the most affected areas during the 2009 A(H1N1)influenza pandemic in China.Here,we analyze the spatial–temporal dynamics of the 2009 pandemic across Changsha municipal districts,evaluate the relationship between case incidence and the local urban spatial structure and predict high-risk areas of influenza A(H1N1).We obtained epidemiological data on all cases of influenza A(H1N1)reported across municipal districts in Changsha during period May 2009–December 2010 and data on population density and basic geographic characteristics for 239 primary schools,97 middle schools,347 universities,96 malls and markets,674 business districts and 121 hospitals.Spatial–temporal K functions,proximity models and logistic regression were used to analyze the spatial distribution pattern of influenza A(H1N1)incidence and the association between influenza A(H1N1)cases and spatial risk factors and predict the infection risks.We found that the 2009 influenza A(H1N1)was driven by a transmission wave from the center of the study area to surrounding areas and reported cases increased significantly after September 2009.We also found that the distribution of influenza A(H1N1)cases was associated with population density and the presence of nearest public places,especially universities(OR=10.166).The final predictive risk map based on the multivariate logistic analysis showed high-risk areas concentrated in the center areas of the study area associated with high population density.Our findings support the identification of spatial risk factors and highrisk areas to guide the prioritization of preventive and mitigation efforts against future influenza pandemics.Hong Xiao Xiaoling Lin Gerardo Chowell Cunrui Huang Lidong Gao Biyun Chen Zheng Wang Liang Zhou Xinguang He Haining Liu Xixing Zhang Huisuo Yang 2014Chinese Science Bulletin2014,59,5:1
12Positive solutions of fourth-order nonlinear singular Sturm–Liouville eigenvalue problems显示文摘Lishan Liu Xinguang Zhang Yonghong Wu 2006Journal of Mathematical Analysis and Applications2006,,2:1
13Power-scalable sub-100-fs Tm laser at 2.08μm显示文摘We report on a power-scalable sub-100-fs laser in the 2-μm spectral range using a Tm;-doped‘mixed’(Lu,Sc);O;sesquioxide ceramic as an active medium.Pulses as short as 58 fs at 2076 nm with an average output power of 114 mW at a pulse repetition rate of approximately 82.9 MHz are generated by employing single-walled carbon nanotubes as a saturable absorber.A higher average power of 350 m W at 2075 nm is obtained at the expense of the pulse duration(65 fs).A maximum average power of 486 mW is achieved for a pulse duration of 98 fs and an optical conversion efficiency of 22.3%,representing the highest value ever reported from sub-100-fs mode-locked Tm lasers.Li Wang Weidong Chen Yongguang Zhao Hanlin Yang Wei Jing Zhongben Pan Hui Huang Jiachen Liu Ji Eun Bae Fabian Rotermund Pavel Loiko Xavier Mateos Zhengping Wang Xinguang Xu Uwe Griebner Valentin Petrov 2021High Power Laser Science and Engineering2021,9,4:1
14A common variant in pre-miR-146 is associated with coronary artery disease risk and its mature miRNA expression显示文摘Xing-dong Xiong Miook Cho Xiu-ping Cai Jie Cheng Xia Jing Jin-ming Cen Xinguang Liu Xi-li Yang Yousin Suh 2014Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis2014,,:1
15Existence of positive solutions for second-order semipositone differential equations on the half-line显示文摘Zhang Xinguang Liu Lishan Wu Yonghong 2007Applied Mathematics and Computation2007,185,:1
16Influence of Ta/Al ratio on the microstructure and creep property of a Ru-containing Ni-based single-crystal superalloy显示文摘Two alloys with different Ta and Al contents were applied to study the influence of Ta/Al ratio on the microstructural evolution and creep deformation under high temperature.The increase of Ta/Al ratio made theγ/γ'lattice misfit more negative and enhanced the volume fraction ofγ'phase,which produced cubic and smallγ'phase in the initial microstructures.These initial tinyγ'phases impeded the dislocations movement and delayed the course of complete raftedγ'phase during the origination of creep deformation,which prolonged the time of the primary creep stage.Moreover,the increase of Ta/Al ratio and addition of Ru produced the denser and stable dislocation networks,the high APB energy and better solution strengthening,which hindered the climbing and sliding of dislocations,and restrained the formation of superdislocations in theγ'precipitate.The second creep stage was extended,and the minimum creep rate was reduced.Hence,the increase of whole creep life of the alloy containing high Ta/Al ratio was attributed to the prolongation of the primary and second creep stages,and the low minimum creep rate.The appearance of the topological inversion phenomenon during the tertiary creep stage was the primary cause for the sudden increase of the creep strain rate of the alloy containing low Ta/Al ratio.However,the high creep strain rate of the alloy containing high Ta/Al ratio during the tertiary creep stage was related to the occurrence and extending of the cracks near the voids.Both alloys would lose efficacy within 20 h-30 h.Wei Song Xinguang Wang Jinguo Li Jie Meng Yanhong Yang Jinlai Liu Jide Liu Yizhou Zhou Xiaofeng Sun 2021Journal of Materials Science & Technology2021,,30:1
17Multiple positive solutions of a singular fractional differential equation with negatively perturbed term显示文摘ZHANG Xinguang LIU Lishan WU Yonghong 2012Mathematical and Computer Modelling2012,55,34:1
18Positive solutions of superlinear semipositone singular Diriehlet boundary value problems显示文摘Zhang Xinguang Liu Lishan 2006J Math Anal Appl2006,316,3:1
19Progress on deuterated potassium dihydrogen phosphate(DKDP)crystals for high power laser system application显示文摘In this review,we introduce the progress in the growth of large-aperture DKDP crystals and some aspects of crystal quality including determination of deuterium content,homogeneity of deuterium distribution,residual strains,nonlinear absorption,and laser-induced damage resistance for its application in high power laser system.Large-aperture high-quality DKDP crystal with deuteration level of 70%has been successfully grown by the traditional method,which can fabricate the large single-crystal optics with the size exceeding 400 mm.Neutron diffraction technique is an efficient method to research the deuterium content and 3D residual strains in single crystals.More efforts have been paid in the processes of purity of raw materials,continuous filtration technology,thermal annealing and laser conditioning for increasing the laser-induced damage threshold(LIDT)and these processes enable the currently grown crystals to meet the specifications of the laser system for inertial confinement fusion(ICF),although the laser damage mechanism and laser conditioning mechanism are still not well understood.The advancements on growth of large-aperture high-quality DKDP crystal would support the development of ICF in China.Mingxia Xu Baoan Liu Lisong Zhang Hongkai Ren Qingtian Gu Xun Sun Shenglai Wang Xinguang Xu 2022Light(Science & Applications)2022,11,9:1
20Multiple positive solutions of a singular fractional differential equation with nega- tively perturbed term显示文摘Zhang Xinguang Liu Lishan Wu Yonghong 2012Mathematical and Computer Modelling2012,55,:1
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