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Systematic review and meta-analysis: Efficacy and safety of balloon angioplasty in salvaging non-matured arteriovenous fistulas. 系统回顾和荟萃分析：球囊血管成形术在挽救未成熟动静脉瘘方面的有效性和安全性。
4区 工程技术
Magnetohydrodynamics Pub Date : 2023-11-01 Epub Date: 2022-04-07 DOI: 10.1177/11297298221085440
Pong Kanchanasuttirak, Wacharaphong Pitaksantayothin, Wuttichai Saengprakai, Burapa Kanchanabat
{"title":"Systematic review and meta-analysis: Efficacy and safety of balloon angioplasty in salvaging non-matured arteriovenous fistulas.","authors":"Pong Kanchanasuttirak, Wacharaphong Pitaksantayothin, Wuttichai Saengprakai, Burapa Kanchanabat","doi":"10.1177/11297298221085440","DOIUrl":"10.1177/11297298221085440","url":null,"abstract":"<p><p>This study aimed to evaluate the clinical and technical success rates achieved after performing balloon-assisted maturation (BAM) for non-matured arteriovenous fistula (AVF). For this, a systematic review and meta-analysis were conducted by searching PubMed and Scopus databases. Studies regarding AVFs not suitable for use based on clinical examination or ultrasound criteria and BAM use for correcting the underlying stenotic lesion were eligible for inclusion in the meta-analysis. Accordingly, 13 studies with 1427 patients with non-matured AVF who underwent BAM were included. The pooled random effect for the clinical success rate was 90% (95% CI, 86%-93%), and that for the technical success rate was 97% (95% CI, 94%-99%). Complications after BAM were reported in 1.7%-41% of the patients. Complications included venous ruptures, wall hematomas, and puncture site hematomas. Early-BAM group had better clinical success rates. BAM is an effective intervention for salvaging non-matured AVF. The procedure is safe and feasible, and high clinical and technical success rates can be achieved. The complications were also manageable without serious sequelae.</p>","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":"52 1","pages":"1244-1252"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90283763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Numerical and experimental study of electrovortex flow and temperature field in liquid metal with bifilar power supply 双线电源下金属液态电涡流流场及温度场的数值与实验研究
IF 0.7 4区 工程技术
Magnetohydrodynamics Pub Date : 2022-05-01 DOI: 10.22364/mhd.58.1-2.7
{"title":"Numerical and experimental study of electrovortex flow and temperature field in liquid metal with bifilar power supply","authors":"","doi":"10.22364/mhd.58.1-2.7","DOIUrl":"https://doi.org/10.22364/mhd.58.1-2.7","url":null,"abstract":"Controlling of electrovortex flows of liquid metal in a confined vessel is an essential feature of electrometallurgical technologies and aggregates, such as stirring, welding, electroslag remelting, electrical arc furnaces, etc. In the present study, the numerical model developed by the authors in previous studies has been improved to compute turbulent velocity and temperature fields for electrovortex flows of liquid metal in an experimental setup with the bifilar direct current supply over two fully submerged electrodes. Melt velocity and temperature fields were measured by applying a thermal-correlation method. The measured and computed results were compared. A good qualitative and quantitative agreement between the experimentally obtained data and the numerical computation results for the velocity field in several setup zones was found. Tables 2, Figs 8, Refs 16.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44381736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental cavitation investigation of the electromagnetic PbBi pump with rotating permanent magnets 旋转永磁体电磁PbBi泵的空化实验研究
IF 0.7 4区 工程技术
Magnetohydrodynamics Pub Date : 2022-05-01 DOI: 10.22364/mhd.58.1-2.21
{"title":"Experimental cavitation investigation of the electromagnetic PbBi pump with rotating permanent magnets","authors":"","doi":"10.22364/mhd.58.1-2.21","DOIUrl":"https://doi.org/10.22364/mhd.58.1-2.21","url":null,"abstract":"Electromagnetic induction pumps with rotating permanent magnets (EMP) are used mostly in experimental setups, where operation safety and reliability are crucial. Such pumps can face flow parameter decrease when operating at a low inlet pressure compared with those gained at higher inlet pressure values. The pump's developed flow rate increase does not correspond to the magnetic rotor rotation rate increase at the lower inlet pressure caused by the cavitation process at the pump’s inlet tract. The study focuses on critical cavitation numbers at several inlet tract sections under severe cavitation conditions which prevent the flow rate increase. The current study is an experimental approach to characterize the pump operation parameters using cavitation numbers and comparing them with the literature data. Figs 7, Refs 13.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42308571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research progress on the seed plasma disk magnetohydrodynamic generator 种子等离子体磁盘磁流体发生器的研究进展
IF 0.7 4区 工程技术
Magnetohydrodynamics Pub Date : 2022-05-01 DOI: 10.22364/mhd.58.1-2.22
{"title":"Research progress on the seed plasma disk magnetohydrodynamic generator","authors":"","doi":"10.22364/mhd.58.1-2.22","DOIUrl":"https://doi.org/10.22364/mhd.58.1-2.22","url":null,"abstract":"To fully and clearly understand the development status and key research problems of the seed plasma disk magnetohydrodynamic (MHD) generator, this study reviews the development process of the seed plasma disk MHD generator. The development of the disk MHD generator has experienced the stages of suppressing the ionization instability of nonequilibrium plasma, revealing the characteristics of stable nonequilibrium plasma based on the concept of seed full ionization, and proving the high performance of the disk MHD generator. At present, there are attempts to use a small area ratio disk MHD generator to obtain a high entropy efficiency at a high enthalpy extraction rate with cesium added inert gas as the working fluid. Moreover, the research progress is described from two aspects of numerical simulation and experimental research, and the key technologies and problems to be solved and the development prospects of the seed plasma disk MHD generator are analysed. It is shown that the future theoretical research still will be focused on the generation and ionization process of nonequilibrium plasma. The key technology in the future is still aimed to obtain high-quality, uniform and stable non-equilibrium plasma. Therefore, in the future, it is expected to become a high-power static power supply with a compact structure and high-power conversion efficiency. Tables 2, Figs 9, Refs 153.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49364006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of advanced cold crucible melting of titanium alloys 先进钛合金冷坩埚熔炼技术的发展
IF 0.7 4区 工程技术
Magnetohydrodynamics Pub Date : 2022-05-01 DOI: 10.22364/mhd.58.1-2.2
{"title":"Development of advanced cold crucible melting of titanium alloys","authors":"","doi":"10.22364/mhd.58.1-2.2","DOIUrl":"https://doi.org/10.22364/mhd.58.1-2.2","url":null,"abstract":"Cold crucible is used to melt reactive metal scrap at elevated temperatures for high quality castings or to produce spherical powders for additive manufacturing. The most advanced crucibles have a small exit nozzle to pour the molten alloy through the bottom opening protected by graphite or ceramic material. The nozzle operates at high temperature and typically lasts several minutes, possibly adding contamination to the outflowing liquid metal. This paper presents new efforts to improve the technique with the aim to achieve a stable commercial process by introducing melting of scrap metal in the presence of liquid flux of different compositions to purify the liquid metal and to enhance thermal effectiveness. The crucial modification in avoiding contamination is a new type of the non-consumable nozzle made of copper segments and the second coil to supply a high frequency electromagnetic field in the vicinity of the nozzle. The nozzle entrance is protected by a thin solidified layer of the same alloy as the main melt. The AC electromagnetic field adds heating at the outflow, modifies the velocity field, gives a possibility to extract particles, and precludes entrainment of slag into the final casting or into the produced powder. The electromagnetic force permits to control the outflow rate and to increase the superheat of the metal at the outlet. The presence of flux permits shielding of the liquid metal from direct contact with the water-cooled side segments of the crucible. The paper demonstrates the effectiveness of numerical modelling to predict and investigate a variety of options in advancement of the cold crucible technique. Figs 8, Refs 13.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42252787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Single dipole permanent magnet induction pump for liquid metals 用于液态金属的单偶极永磁感应泵
IF 0.7 4区 工程技术
Magnetohydrodynamics Pub Date : 2022-05-01 DOI: 10.22364/mhd.58.1-2.10
{"title":"Single dipole permanent magnet induction pump for liquid metals","authors":"","doi":"10.22364/mhd.58.1-2.10","DOIUrl":"https://doi.org/10.22364/mhd.58.1-2.10","url":null,"abstract":"Electromagnetic liquid metal induction pumps can be used in different technological processes, such as dosing, mixing, crystallization and others. Contactless devices are of special importance in metallurgical processes because high temperature metals are chemically aggressive and erode most materials over time. Additionally, induction pumps with permanent magnets are more efficient and cheaper than AC electromagnetic induction alternatives, thus allowing for a wider application range. A single dipole permanent magnet rotor magnetized perpendicular to the axis of rotation induces a travelling magnetic field and is used to demonstrate the effectiveness of the liquid metal pump. Non-dimensional parameters are analysed to upscale the experimental results to an industrial size dispenser. Tables 1, Figs 6, Refs 9.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47193558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamics of liquid metal layer in transverse AC magnetic field 横向交流磁场下液态金属层动力学
IF 0.7 4区 工程技术
Magnetohydrodynamics Pub Date : 2022-05-01 DOI: 10.22364/mhd.58.1-2.15
{"title":"Dynamics of liquid metal layer in transverse AC magnetic field","authors":"","doi":"10.22364/mhd.58.1-2.15","DOIUrl":"https://doi.org/10.22364/mhd.58.1-2.15","url":null,"abstract":"Dynamics of the liquid metal free surface is an important aspect in many different metallurgical processes, such as cold crucible melting and continuous casting. An AC magnetic field can be used to change the shape of the liquid metal volume. Here, we study experimentally and numerically a rectangular liquid metal layer exposed to a transverse AC magnetic field. Depending on different parameters, such as the layer thickness and the surface oxidation, different free surface shapes and their dynamics are observed experimentally. We have simulated this fundamentally three-dimensional process using the coupled open-source software. Based on experimental observations, surface oxidation in the numerical model is approximated as a modified contact angle between the liquid metal and the vessel's walls. The numerical results agree well with experiments. Figs 6, Refs 8.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47387233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Real time flow control during continuous casting with Contactless Inductive Flow Tomography 用非接触感应流层析成像技术实时控制连铸过程中的流量
IF 0.7 4区 工程技术
Magnetohydrodynamics Pub Date : 2022-05-01 DOI: 10.22364/mhd.58.1-2.17
{"title":"Real time flow control during continuous casting with Contactless Inductive Flow Tomography","authors":"","doi":"10.22364/mhd.58.1-2.17","DOIUrl":"https://doi.org/10.22364/mhd.58.1-2.17","url":null,"abstract":"Lack of appropriate flow measurement techniques for liquid steel during continuous casting limits the application of control strategies that could improve the quality of the end product. Contactless Inductive Flow Tomography (CIFT) is a promising measurement technique that can provide information about the flow structure in the mould to a real time controller. On this basis, electromagnetic actuators can be used to react on undesired flow conditions in the mould. However, because of their nature, these actuators pose a significant challenge for inductive measurement methods. In this work we describe the influence of an electromagnetic brake on CIFT in a laboratory environment. We also show how this influence can be fully compensated, which facilitates the viability of CIFT as a key ingredient of real time control of continuous casting. Figs 5, Refs 15.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44748322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Growth rate of azimuthal perturbation modes in an ideal annular linear induction pump 理想环形线性感应泵中方位微扰模式的生长速率
IF 0.7 4区 工程技术
Magnetohydrodynamics Pub Date : 2022-05-01 DOI: 10.22364/mhd.58.1-2.19
{"title":"Growth rate of azimuthal perturbation modes in an ideal annular linear induction pump","authors":"","doi":"10.22364/mhd.58.1-2.19","DOIUrl":"https://doi.org/10.22364/mhd.58.1-2.19","url":null,"abstract":"This study is aimed at investigating the growth rate of azimuthal perturbation modes in an ideal annular linear induction pump model. The positive growth rate of azimuthal perturbation modes is associated with the unstable behaviour of the annular linear induction pump and is known in the literature as MHD instability characterized by strong low-frequency oscillations of magnetic field, flowrate, and pressure. A linear stability analysis of a height-averaged quasi-stationary main flow in the ideal annular linear induction pump has been conducted, where only temporally evolving azimuthal modes of the axial velocity and magnetic field perturbations were considered. The obtained results predict damped or damped oscillating perturbations in a stable regime as a function of Rm, Rms, N and κm. In the studied parameter range, an amplification of perturbations without oscillations was observed above the instability threshold. It can be concluded that the analysed model of the ideal annular linear induction pump cannot predict experimentally and numerically the observed low frequency oscillations. Figs 4, Refs 17.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43773495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Feasibility of using contactless electromagnetic cavitation for steel composite manufacturing 采用非接触电磁空化技术制造钢复合材料的可行性
IF 0.7 4区 工程技术
Magnetohydrodynamics Pub Date : 2022-05-01 DOI: 10.22364/mhd.58.1-2.5
{"title":"Feasibility of using contactless electromagnetic cavitation for steel composite manufacturing","authors":"","doi":"10.22364/mhd.58.1-2.5","DOIUrl":"https://doi.org/10.22364/mhd.58.1-2.5","url":null,"abstract":"This work investigates the feasibility of using contactless electromagnetic sonication for dispersing and refining the strengthening phase in iron and steel for ferrous metal matrix composite production. An oscillating pressure field is generated under superimposed alternating (0.13 T) and steady magnetic fields (up to 8 T). The processing employs a static floating-zone technique and is crucible-free. This approach allows to reach an around 0.8 MPa pressure oscillation amplitude that is sufficient to initiate acoustic cavitation in high melting temperature liquid metals. The viability of different reinforcement dispersions, both ex situ and in situ using this electromagnetic sonication, is explored in the context of the production of oxide dispersion strengthened steel and high modulus steel. Figs 3, Refs 9.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49158072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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