检索结果-南通市图书馆

三腔胃肠管辅助治疗内镜操作后上消化道穿孔的疗效分析

在线全文

学校读者我要写书评

暂无评论

中国普通外科杂志 2015年第10期24卷 1483-1486页

作者：刘峥嵘首都医科大学附属北京天坛医院普通外科北京100050

目的:分析探讨三腔胃肠管辅助治疗内镜操作后上消化道穿孔的疗效。方法:选取2010年2月—2015年1月经内镜治疗后上消化道穿孔的患者86例,采用计算机产生随机数,将其分为两组,观察组与对照组各43例,观察组在术中或术后行内镜下放置三腔胃... 详细信息

目的:分析探讨三腔胃肠管辅助治疗内镜操作后上消化道穿孔的疗效。方法:选取2010年2月—2015年1月经内镜治疗后上消化道穿孔的患者86例,采用计算机产生随机数,将其分为两组,观察组与对照组各43例,观察组在术中或术后行内镜下放置三腔胃肠管,对照组在术中或术后留置传统胃管。观察两组治疗成功率、创面闭合时间、腹痛、腹胀缓解时间、胃液p H值。结果:观察组治疗成功率为88.37%,5例患者转外科手术,其中十二指肠球降交界溃疡合并出血、胃窦部溃疡合并出血的患者各1例,3例因内镜黏膜切除术后发生消化道出血,腹膜炎症状加重后转外科急诊手术。对照组治疗成功率为76.74%,另外10例患者均出现不同程度出血,急转外科手术治疗,两组治疗成功率无统计学差异(P>0.05)。观察组平均住院时间(9.85±3.05)d少于对照组的(12.10±2.50)d,观察组患者腹痛、腹胀症状自觉消失时间早于对照组,观察组钛夹夹闭创面患者与未夹闭创面患者创面愈合时间均明显低于对照组,差异均有统计学意义(P0.05)。结论:三腔胃肠管辅助治疗内镜操作后上消化道穿孔疗效可靠。

关键词：消化道穿孔/并发症内镜三腔胃肠管

Distribution Characteristics of Polycyclic Aromatic Hydrocarbons in Different Size Particles from Flue Gas by Waste Incineration

在线全文

学校读者我要写书评

暂无评论

Distribution Characteristics of Polycyclic Aromatic Hydrocar...

Input-to-State Stability of Impulsive Switched Systems Involving Uncertain Impulse-Switching Moments

中国化学会第十八届全国有机分析及生物分析学术研讨会

作者： liu H. Lv D-T. Duan M-Q. Wang F. Yu X-L. YS Wang zr liu Sun Y. College of Recourses and Environment Sciences China Agriculture University

Collecting gas particles generated by waste incineration with MASSFLOW CONTROLLED PUF SAMPLER to analyze the distribution of particulate polycyclic aromatic hydrocarbons. The results showed that PAHs generated by garbage incineration focused on small particulate matter. Judged by the distribution of Benzopyrene equivalent concentration, PAHs attached to PM2.5 accounted for 91.62%, of which seven highly carcinogenic polycyclic aromatic hydrocarbons accounted for 87%.

关键词： Garbage incineration particulate polycyclic aromatic size distribution

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1515-1517页

作者： Chang liu Wenlu liu Tengda Wei Xiaodi Li School of Mathematical and Statistics Shandong Normal UniversityJinan 250014China

Dear Editor,This letter studies the input-to-state stability(ISS)for a class of impulsive switched systems,where uncertain impulse-switching moments are *** robustness of ISS with respect to the perturbations of the occurrence time of impulse-switching moments is revealed by several less conservative dwell-time conditions for the uncertain impulse-switching moments combined with Lyapunov ***,the Lyapunov conditions have multiple coefficients at discrete time so as to handle the hybrid effect of impulse-switching moments,and the case that time derivative of Lyapunov function is indefinite is also taken into ***,a numerical example is proposed to illustrate the effectiveness of the theoretical results.

关键词： letter conservative derivative

Hydrogen and nitrogen absorption properties of Ce-added zr_(2)(Fe_(1-x)Ni_(x)) alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第6期42卷 1136-1141,I0005页

作者： Kai Yin Xiaopeng liu State Key Laboratory of Advanced Materials for Smart Sensing GRINM Group Co.Ltd.Beijing10088China GRIMAT Engineering Institute Co. Ltd.Beijing101407China General Research Institute of Nonferrous Metals Beijing100088China

To improve the nitriding resistance of zr_(2)Fe alloy,the Ce-added zr_(2)(Fe_(1-x)Ni_(x))(x=0,0.15,0.3,0.5)alloys were prepared by magnetic levitation melting *** effects of Ni substitution for Fe on the phase structure,hydrogen and nitrogen absorption properties of the alloys were investigated by X-ray diffraction,scanning electron microscopy and p-c isotherm *** experimental results show that Ni substitution can effectively inhibit the formation of both α-zr and zrFe_(2) phases and promote the formation of C16 structure zr_(2)(Fe,Ni)phase,causing Ni-substituted alloys to exhibit low nitrogen absorption rate and *** 623 K under 0.5 MPa nitrogen pressure,the nitrogen absorption capacity of Ce-added zr_(2)(Fe_(0.5)Ni_(0.5))alloy reaches to 0.8 mL/g,much lower than that of zr_(2)Fe alloy(1.5 mL/g).Ni substitution decreases the crystal cell volume of the C_(16)zr_(2)(Fe,Ni)phase,resulting in an increase in the hydrogen absorption equilibrium *** 623 K under 0.05 MPa hydrogen pressure,the hydrogen absorption capacity decreases from 1.46 wt%of zr_(2)Fe alloy to 1.41 wt%of Ce-added zr_(2)(Fe_(0.5)Ni_(0.5))alloy.

关键词： zr_(2)Fe alloy Ce Pressure-composition isotherm Hydrogen absorption Nitrogen absorption Rare earths

Global adaptive output-feedback tracking with prescribed performance for uncertain nonlinear systems

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第5期67卷 150-164页

作者： Yuan WANG Yungang liu School of Control Science and Engineering Shandong University

At present, one typical control strategy for guaranteeing transient and steady-state performance is funnel control and prescribed performance control. The strategy features completely discarding the system nonlinearities, even if they are completely known and available. Such an intrinsic feature requires the controller to produce a larger control effect to eliminate the negative impact caused by the high nonlinearities, leading to a conservative controller. In this paper, we fully take advantage of known information on nonlinearities in control design, instead of completely discarding it as done in funnel control. Particularly, we leverage adaptive techniques(i.e., high-gain dynamic compensation) to deal with unknown system nonlinearities. Meanwhile, we integrate the tools of output feedback, tracking control, and the performance *** such, an adaptive output-feedback scheme is developed for global tracking with spatiotemporal performance specifications: arbitrarily given tracking accuracy and accuracy-ensured time. A simulation example supports the developed approach.

关键词： uncertain nonlinear systems output feedback prescribed performance unknown control direction dynamic high gain global tracking

Peeling of Magneto-responsive Beams with Large Deformation Mediated by the Parallel Magnetic Field

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2024年第3期37卷 457-467页

作者： Gongqi Cao Zhangna Xue Shiyang liu Yuchen Jin Jianlin liu College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao266580China

Elasto-capillarity phenomena are prevalent in various industrial fields such as mechanical engineering,material science,aerospace,soft robotics,and *** this study,two typical peeling processes of slender beams driven by the parallel magnetic field are investigated based on experimental and theoretical *** first is the adhesion of two parallel beams,and the second is the self-folding of a long *** these two cases,the energy variation method on the elastica is used,and then,the governing equations and transversality boundary conditions are *** is shown that the analytical solutions are in excellent agreement with the experimental *** effects of magnetic induction intensity,distance,and surface tension on the deflection curve and peeling length of the elastica are fully *** results are instrumental in accurately regulating elasto-capillarity in structures and provide insights for the engineering design of programmable microstructures on surfaces,microsensors,and bionic robots.

关键词： Magneto-responsive beam Adhesion and peeling Self-folding Elastica Transversality condition

Performance of composite foundations with different load transfer platforms and substratum stiffness over silty clay

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2024年第5期21卷 1761-1774页

作者： ZHANG Shuming liu Yan YUAN Shengyang liu Xianfeng JIANG Guanlu liu Junyan School of Civil Engineering and Architecture University of JinanJinan 250022China The Engineering Technology Research Center for Urban Underground Engineering Supporting and Risk Monitoring of Shandong Province Jinan 250022China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Key Laboratory of High-speed Railway Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China

The semi-rigid pile-supported composite foundation is widely used in highway projects due to its effectiveness in increasing the bearing capacity and stability of *** is crucial to understand the stress distribution across the embankment width and the behaviour of unreinforced ***,five centrifuge tests were conducted to examine the bearing and deformation behaviours of NPRS(Non-Connected Piled Raft Systems)and GRPS(GeosyntheticReinforced Pile-Supported systems)with varying substratum stiffness,then a comparative analysis was conducted on embankment settlement,pressures underneath the embankments,and axial forces along the *** results indicated that greater substratum stiffness correlates with reduced settlement and deformation at various *** occurring 5 meters from the embankment toe includes settlement in NPRS and upward movement in *** potential sliding surface is primarily located within the embankment in NPRS,whereas it may extend through both the embankment and foundation in *** pile-soil stress ratio and efficiency in NPRS are higher than in GRPS across the *** axial force borne by end-bearing piles is significantly greater than that by floating *** the buried depth increases,the axial force in GRPS initially rises then declines,whereas in NPRS,it remains relatively constant within a certain range before *** study aids in assessing the applicability of composite foundations in complex railway environments and provides a reference for procedural measures under similar conditions.

关键词： Centrifuge modelling Composite foundation Failure mode Load transfer platform Substratum Stiffness Silty clay

OCT1和ABCG2基因多态性与中国癫痫患者拉莫三嗪血药浓度相关性研究

在线全文

学校读者我要写书评

暂无评论

癫痫杂志 2016年第6期2卷 555-556页

作者： Shen CH Zhang YX Lu RY Jin B Wang S liu zr Tang YL 丁美萍浙江大学附属第二医院神经内科杭州310009

背景拉莫三嗪(Lamotrigine,LTG)是新一代抗癫痫药物(Antiepileptic drugs,AEDs),广泛用于部分性和全面性癫痫的治疗.然而先前的研究已经观察到不同个体之间LTG药代动力学的显著差异,由于临床和环境等因素,遗传易感性对这些差异起到重要... 详细信息

背景拉莫三嗪(Lamotrigine,LTG)是新一代抗癫痫药物(Antiepileptic drugs,AEDs),广泛用于部分性和全面性癫痫的治疗.然而先前的研究已经观察到不同个体之间LTG药代动力学的显著差异,由于临床和环境等因素,遗传易感性对这些差异起到重要作用.研究发现单核苷酸多态性(Single nucleotidepolymorphisms,SNPs)如UGT1A4和UGT2 B7可能影响LTG的血药水平,多态转运蛋白如P-糖蛋白(P-glycoprotein,P-gp,由MDR1/ABCB1编码)、乳腺癌而耐药蛋白(Breast cancer resistance protein,BCRP,由ABCG2编码)和多药耐受蛋白(Multi-drug resistance protein 2,MRP,由ABCC2编码)的过表达对LTG治疗的药代动力学和生物利用度也产生影响.研究发现ABCB1 rs1128503和ABCG2 rs2231142的基因多态性与LTG单药治疗时的血药浓度有关.然而,另一ABCG2基因的变异(rs2231137)和ABCC2的作用并没有研究报道.作为流入转运体亚家族的有机阳离子转运体(Organic cation transporters,OCTs)在阳离子药物的分布和分泌中起到重要作用.肝细胞核因子4α(Hepatocyte nuclear factor 4 alpha,HNF4α)是肝组织内调节肝细胞发育和分化的因子,在人类和老鼠的肝脏中与多种基因启动子直接相连.有报道表明HNF4α rs2071197可能与LTG血药浓度相关,然而另一个SNP(HNF4α rs3212183)对于LTG血药浓度的作用并不甚清楚.

关键词：编码癫痫基因多态性蛋白血药浓度

Research on dynamic measurement method of speckle in laser display

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optoelectronics Letters 2024年第6期20卷 360-366页

作者： liu Hong liu Yaning ZHANG Xiaoyu School of Electronics Information Shanghai Dianji UniversityShanghai 201306China

Laser display technology is the most promising display technology in the market and is widely used in many fields. However, laser speckle has been troubling the application and expansion of this technology in some fields. In order to better evaluate the speckle, speckle measurement methods must be studied. In this study, a dynamic measurement method for laser speckles is proposed according to the optical superposition characteristics of speckle, which can reduce the influence of non-coherent factors on the speckle measurement results. The feasibility of the dynamic speckle measurement method is verified by designing an experimental scheme.

关键词： Research on dynamic measurement method of speckle in laser display