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Structural and corrosion characterization of biodegradable Mg-RE (RE=Gd, Y, Nd) alloys

Transactions of Nonferrous Metals Society of China 2013年第5期23卷 1215-1225页

作者： j.kubSEK D.VOjTěCH Department of Metals and Corrosion Engineering Institute of Chemical Technology

Binary Mg-Gd （up to 5% Gd in mass fraction）, Mg-Nd （up to 9% Nd in mass fraction） and ternary Mg-Gd-Y （up to 5% Gd, 1% Y） alloys with precisely determined contents of cathodic impurities （Fe, Ni, Cu, Co） were studied. The alloys were studied in the as-cast state （cooling rate of 500 K/min） and after solution heat treatment （T4）. Structures were investigated by optical and scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction and glow discharge spectrometry. Structural investigation was completed by Vickers hardness measurements. Corrosion behavior in the simulated physiological solution （9 g/L NaCl） was assessed by immersion tests and potentiodynamic measurements. It was found that the structures of the as-cast alloys were dominated by fine a-Mg dendrites and eutectic Mg-RE phases. The dendrites exhibited RE-concentration gradients which were most pronounced in the Mg-Gd alloys. For this reason, the T4 heat treatment of the Mg-Gd alloy led to the formation of a new cuboidal Mg5Gd phase. The corrosion resistance was significantly improved by Gd. The effect of Nd was weak and the addition of Y to Mg-Gd alloys had harmful effect on the corrosion resistance. The T4 heat treatment strongly accelerated the corrosion of Mg-Gd alloys. Its effect on the corrosion of Mg-Nd alloys was not significant. The observed corrosion behavior of the alloys was discussed in relation to their structural states and contents of cathodic impurities.

关键词： biodegradable material magnesium rare earths Mg-RE alloy structure corrosion

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Test of incremental respiratory endurance as home-based, standalone therapy in chronic obstructive pulmonary disease: A case report

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World journal of Clinical Cases 2022年第1期10卷 353-360页

作者： Filip Dosbaba Martin Hartman Ladislav Batalik Kristian Brat Marek Plutinsky j.kub hnatiak Magno F Formiga Lawrence Patrick Cahalin Department of Rehabilitation University Hospital BrnoBrno 62500Czech Republic Department of Public Health Faculty of MedicineMasaryk University BrnoBrno 62500Czech Republic Department of Respiratory Diseases University Hospital BrnoBrno 62500Czech Republic International Clinical Research Center St.Anne’s University HospitalBrno 65691Czech Republic Departamento de Fisioterapia Universidade Estadual da ParaíbaCampina Grande 58051Brazil Department of Physical Therapy University of Miami–Miller School of MedicineCoral GablesFL 33101United States

BACKGROUND The prevalence of chronic obstructive pulmonary disease(COPD)is increasing worldwide,and at the same time it is associated with increased mortality and reduced quality of *** to build sustainable rehabilitation approaches to COPD treatment and prevention are *** system of long-term pulmonary rehabilitation care is *** main reasons for the absence of these outpatient programs are the lack of experience,the lack of interest of insurance companies in secondary prevention programs,and the lack of healthcare facilities in large geographical *** possibility of at-home pulmonary rehabilitation models(telemonitoring and telecoaching)could solve this *** SUMMARY A 71-year-old man with severe COPD,Global Initiative for Obstructive Lung Diseases stage 3 underwent an 8-wk remotely monitored inspiratory muscle training with a device based on the test of incremental respiratory endurance ***,body plethysmography,test of incremental respiratory endurance examination,6-min walking test,body mass index,airflow obstruction,dyspnea,exercise capacity index,and subjective perception of dyspnea were performed as part of the initial and final *** patient performed training at home,and the physiotherapist monitored the patient remotely through a web application that allowed the physiotherapist to evaluate all training parameters in real-time and respond to any *** 8 wk of home training,there was a significant increase in all monitored values:maximal inspiratory pressure,a novel parameter sustained maximal inspiratory pressure,forced expiratory volume in 1 s,total lung capacity,forced vital capacity,peak expiratory flow,and inspiratory *** was also an improvement in the perception of dyspnea according to the COPD Assessment Test and a modified Medical Research Council Breathlessness Scale,an increase in exercise tolerance according to the 6-min walking test,and a decrease in the exercise

关键词： Chronic obstructive pulmonary disease Test of incremental respiratory endurance Inspiratory muscle training Telerehabilitation Case report

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Surface Geophysical Methods used to Verify the Karst Geological Structure in the Built-up Area:A Case Study of Specific Engineering-Geological Conditions

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Acta Geologica Sinica(English Edition) 2021年第5期95卷 1763-1770页

作者： Rene PUTISKA Marian MARSCHALKO Isik YILMAZ Dominik NIEMIEC CHENG Xianfeng Ivan DOSTAL jan kubAC Comenius University Faculty of Natural SciencesDepartment of Applied and Environmental GeophysicsIlkovičova 6BratislavaSlovakia VSB-Technical University of Ostrava Faculty of Mining and GeologyInstitute of Geological Engineering17 listopadu1570833OstravaCzech Republic Cumhuriyet University Faculty of EngineeringDepartment of Geological Engineering58140 SivasTurkey Yunnan Land and Resources Vocational College Kunming 652501China

This article presents a research study of complex limestone karst engineering-geological conditions in the municipality Valaskanear Banska Bystrica in *** aim of the study is to demonstrate the impossibility of spatial identification of cave spaces using surface geophysical methods due to the specific engineering-geological conditions of a thick surface layer of anthropogenic fill containing highly heterogeneous anthropogenic *** maximum thickness is 3 *** specificific condition of the study area is its location in the built-up area,due to which the applicability of geophysical methods was *** article contains methodological recommendations to be used in analogous geological conditions with karst structures topped with anthropogenic fill,which complicates the identification of cave *** recommended solution herein is the identification of the cave system using underground mapping of the karst and its projection onto the surface for which surface geophysical methods have been combined.

关键词： karst engineering geology limestone dolomite anthropogenic fill complicated engineering-geological conditions geophysical study

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针状肾镜Needle-perc系统辅助建立标准皮肾通道PCNL治疗无积水肾脏结石

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临床泌尿外科杂志 2021年第4期36卷 297-300页

作者：李建业吴君贤穆大为邢继章郭和清孙斌仇实贾辰龙李建兴肖博空军特色医学中心泌尿外科北京100142 空军特色医学中心医疗科研部清华大学附属北京清华长庚医院泌尿外科

目的:探讨针状肾镜Needle-perc系统辅助建立标准皮肾通道PCNL治疗无积水肾脏结石的安全性和有效性。方法:回顾性分析2018年3月—2020年8月在我院接受标准通道经皮肾镜碎石术的21例无积水肾结石患者的临床资料,其中完全鹿角型结石2例,不... 详细信息

目的:探讨针状肾镜Needle-perc系统辅助建立标准皮肾通道PCNL治疗无积水肾脏结石的安全性和有效性。方法:回顾性分析2018年3月—2020年8月在我院接受标准通道经皮肾镜碎石术的21例无积水肾结石患者的临床资料,其中完全鹿角型结石2例,不完全鹿角型结石7例,肾盂多发结石1例,上盏结石1例,中盏结石3例,下盏结石7例,结石中位最大长径2.5(1.6~4.9)cm(多发结石计算结石最大长径之和)。术中在超声引导下应用Needle-perc系统进行可视化穿刺、辅助建立皮肾通道。结果:21例患者手术均顺利完成,对19例患者实施单通道手术,2例患者实施双通道手术,F24标准通道均一期建立成功,中位手术时间80(50~175)min,术中无集合系统穿孔及肾脏周围脏器损伤等并发症;术后输血率4.7%(1/21),6例患者术后出现发热,给予静脉输注抗生素治疗。术后复查kub显示一期结石清除率85.7%(18/21)。结论:针状肾镜Needle-perc系统可以降低PCNL无积水肾脏结石标准通道建立难度,有效减少该类患者通道建立相关并发症的发生。

关键词：针状肾镜无积水肾结石经皮肾镜取石术

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