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improving left ventricular remodelling and clinical outcome following surgical and trans-catheter aortic valvereplacement

Frontiers of Medicine 2021, Volume 15, Issue 3, Pages 416-437 doi: 10.1007/s11684-021-0852-7

Abstract: Over the last half century, surgical aortic valve replacement (SAVR) has evolved to offer a durable andefficient valve haemodynamically, with low procedural complications that allows favourable remodellinglatter has become more challenging among elderly patients, particularly following trans-catheter aortic valvePrecise understanding of myocardial adaptation to pressure and volume overloading and its responses to valvesurgery requires comprehensive assessments from aortic valve energy loss, valvular-vascular impedance

Keywords： surgical aortic valve replacement trans-catheter aortic valve implantation left ventricular hypertrophy

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The evolution of surgical and medical treatment of aortic root aneurysm

Xu Yu Jin,Li Yuan,Mario Petrou,John R. Pepper

Frontiers of Medicine 2014, Volume 8, Issue 4, Pages 427-432 doi: 10.1007/s11684-014-0385-4

Abstract:

Since first report of aortic root replacement in 1968, the surgical risk and long term outcome ofIn the last 30 years, the surgical approach is also evolving towards more valve conservation with prophylactical

Keywords： aortic root aneurysm aortic root replacement valve sparing root replacement personalised external aortic

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Novel piezoelectric pump with “E”-shaped valve found from sub-experiments

Jianhui ZHANG, Jun HUANG, Xiaoqi HU, Qixiao XI,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 2, Pages 212-218 doi: 10.1007/s11465-010-0009-x

Abstract: Increasing the driving frequency of a piezoelectric vibrator can resolve the bottleneck of low flow in a valveHowever, a piezoelectric pump of a traditional valve body presents the hysteretic nature of the valveFirst, through the sub-experiment on various parameters of the plate valve of a piezoelectric pump, thethe hysteretic nature of the valve, were discovered.Second, an “E”-shaped valve and piezoelectric pump with an “E”-shaped valve (

Keywords： piezoelectricity valve pump experiment “ E” -shaped valve

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Nonlinear sealing force of a seawater balance valve used in an 11000-meter manned submersible

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0726-y

Abstract: Balance valve is a core component of the 11000-meter manned submersible “struggle,” and its sealing performanceanalytical–numerical–experimental (ANE) model is proposed to obtain the minimum sealing force, ensuring no leakage at the valveFinally, the minimum sealing force equation is applied in a balance valve to be experimented using aThe balance valve designed through the minimum sealing force equation is leak-free in the experiment.Thus, the minimum sealing force equation is suitable for the ultrahigh pressure balance valve and has

Keywords： seawater balance valve sealing performance hybrid ANE model FEM minimum sealing force equation

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Artificial bee colony optimization for economic dispatch with valve point effect

Yacine LABBI,Djilani Ben ATTOUS,Belkacem MAHDAD

Frontiers in Energy 2014, Volume 8, Issue 4, Pages 449-458 doi: 10.1007/s11708-014-0316-8

Abstract: This paper presents the well-known power system ED problem solution considering valve-point effect byhas been applied to various test systems with incremental fuel cost function, taking into account the valve-point

Keywords： artificial bee colony (ABC) algorithm economic dispatch (ED) valve-point effect optimization

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Development of a novel two-stage proportional valve with a pilot digital flow distribution

Qiang GAO, Yuchuan ZHU, Changwen WU, Yulei JIANG

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 2, Pages 420-434 doi: 10.1007/s11465-020-0622-2

Abstract: of improving the dynamic performance, reliability, and digitization of the traditional proportional valve, a novel two-stage proportional valve with a pilot digital flow distribution is proposed from the viewpointof the dual nozzle-flapper valve’s working principle.First, the working principle and mathematical model of the proposed valve are determined.’s spring) on the main valve’s motion are analyzed on the basis of theory, simulation, and experiment

Keywords： two-stage proportional valve digital flow distribution high-speed on/off valve position tracking characteristic

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Effect of fly ash replacement level on the fracture behavior of concrete

Mahdi AREZOUMANDI, Jeffery S. VOLZ

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4, Pages 411-418 doi: 10.1007/s11709-013-0228-4

Abstract: This study presents the results of an experimental investigation that evaluates effect of fly ash replacementThis study includes four mixes with 0%, 30%, 50%, and 70% fly ash as a cement replacement.Results of these statistical tests show that the mix with higher level of fly ash replacement level has

Keywords： concrete fracture energy fly ash

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Right coronary occlusion following transcatheter aortic valve implantation: two case reports

Gang Zhang,Jun Luo,Guo Chen

Frontiers of Medicine 2016, Volume 10, Issue 3, Pages 351-355 doi: 10.1007/s11684-016-0465-8

Abstract: stenosis, whose right coronary arteries (RCA) were completely occluded during transcatheter aortic valveThe second patient’s blood pressure fluctuated greatly for several minutes after the valve implantation

Keywords： aortic stenosis transcatheter aortic valve implantation right coronary occlusion cardiac group

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Fluid damping clearance in a control valve of injector

ZHANG Jianming, ZHANG Weigang, YANG Bing, WANG Yawei

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4, Pages 439-441 doi: 10.1007/s11465-007-0075-x

Abstract: A force model of a control valve of injector is set up, and the changes of the fluid damping clearanceon the basis of the results of the computational fluid dynamics (CFD) and the experiments of control valveResults indicate that a damping clearance of 0.02–0.03 mm between the poppet and the valve guide is themost sufficient to dampen any excessive control valve poppet bouncing.

Keywords： control computational bouncing CFD excessive control

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Endosulfan residues and farmers’ replacement behaviors of endosulfan in the north-west inland cotton

Frontiers of Environmental Science & Engineering 2023, Volume 18, Issue 4, doi: 10.1007/s11783-024-1803-8

Abstract:

● The situation of endosulfan residues in cotton fields were assessed.

Keywords： Cotton fields Endosulfan residues Farmers KAP survey Replacement behaviours

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Solution to economic dispatch problem with valve-point loading effect by using catfish PSO algorithm

K. MURALI,T. JAYABARATHI

Frontiers in Energy 2014, Volume 8, Issue 3, Pages 290-296 doi: 10.1007/s11708-014-0305-y

Abstract: The ED problems considered in this paper include valve-point loading effect, power balance constraints

Keywords： economic dispatch (ED) valve point loading catfish particle swarm optimization (PSO) optimization

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Piezoelectric pump with flexible venous valves for active cell transmission

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0712-4

Abstract: In this study, we designed a piezoelectric pump with a flexible venous valve inspired by that of humanselectric-solid-liquid multi-physical field coupling of the piezoelectric pump with a flexible venous valve

Keywords： venous valve flexible venous valve cell transmission organ-on-a-chip system piezoelectric device

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A hybrid BFA-PSO algorithm for economic dispatch with valve-point effects

T. Jayabarathi, Prateek Bahl, Harsha Ohri, Afshin Yazdani, V. Ramesh

Frontiers in Energy 2012, Volume 6, Issue 2, Pages 155-163 doi: 10.1007/s11708-012-0189-7

Abstract: This paper presents a novel and efficient method for solving the economic dispatch (ED) problems with valve-pointTo include valve point effects sinusoidal terms are added to the fuel cost function.outperforms other methods in terms of convergence rate and solution quality in solving the ED problems with valve-point

Keywords： bacterial foraging algorithm (BFA) economic dispatch (ED) particle swarm optimization (PSO) valve-point

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Design of damping valve for vehicle hydro pneumatic suspension

DONG Mingming, HUANG Hua, GU Lian

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1, Pages 97-100 doi: 10.1007/s11465-008-0014-5

Abstract: According to the design features of a hydro pneumatic spring, the necessity of a separate damping valvelinear suspension model, the optimum damping coefficient is worked out and the parameters of the damping valveA practical structure of the damping valve is proposed having a small size, high flowrate when the valveBased on bench tests, the damping valve has been found to properly work and be suitable.The design method and damping valve structure are useful guides for hydro pneumatic suspension, especially

Keywords： ability pneumatic necessity flowrate equivalent linearization

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term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement

Jingwei YING; Feiming SU; Shuangren CHEN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 3, Pages 302-315 doi: 10.1007/s11709-022-0803-7

Abstract: performance of recycled aggregate concrete (RAC) components for different values of water−cement ratio and replacementGenerally, the concrete strength decreases with the increase of the replacement rate of RCA, in orderto meet the strength requirements when changing the replacement rate of RCA, it is necessary to changeproperties of reinforced concrete beams were tested respectively by changing water−cement ratio and RCA replacementThe brittleness of concrete before failure can be reduced more effectively by adjusting the replacement

Keywords： recycled concrete beam the replacement rate of recycled coarse aggregate water–cement ratio digital