Background Postinfarction ventricular remodeling is associated with lengthening and contractile dysfunction of the remote noninfarcted myocardium. Mechanisms underlying this phenomenon remain unclear. Methods Results We studied serial changes in global left (LV) structure function infarcted (1, 2, 4, 6 weeks after myocardial infarction) sham-operated rat hearts correlated them structural functional myocytes isolated from LV myocardium same hearts. Rats infarction developed significant...

The study aim was to analyse the safety and feasibility of laparoscopic intersphincteric resection with stapled coloanal anastomosis for low rectal cancer.Between March 2009 August 2010, 22 patients underwent a without diverting ileostomy. results were compared retrospectively hand-sewn anastomoses performed between January 2001 May 2009, which included 55 open 38 resections. morbidity comparison only data relevant anastomosis. Function using Saito function questionnaire Wexner score...

Although the amorphous alloy core distribution transformers (AMDTs) have advantage of lower no-load losses over orientation silicon-steel transformers, a high noise level is inevitable. The vibration and for different positions cores are still unknown. Understanding behaviors under operation vital to reduce AMDT. In this paper, two from 10 kVA AMDT 24-turn coils were used as testing objects, ac voltage 54.3 V was applied until magenetic flux density attained 1.337 T. finite-element method...

Amorphous metal distribution transformers (AMDT) are widely used in power grids due to their low no-load loss. Many scholars have carried out research on the fault detection of transformer windings, tap changers and other parts. However, high magnetostriction amorphous alloy, vibration generated by AMDT during operation will cause various mechanical failures. This paper studies characteristics SCBH 15-200/100 through tests find some failures AMDT. The installation position sensor determined...

The prominent vibration characteristics of amorphous alloy transformer (AMT) make it possible to apply the method for real-time fault monitoring AMT. Therefore, in order solve AMT problem and enhance diagnostic efficiency, this study proposes an diagnosis model based on particle swarm optimization (PSO) optimize parameters wavelet packet transform (WPT) support vector machine (SVM).The optimal signal acquisition point is determined by finite element analysis ensure high quality. PSO...

Transformer oil, insulating paper, high voltage direct current (HVDC) bushings and on-load tap changer (OLTC) are essential parts of converter transformers. When the power flow HVDC system is reversed or a sudden outrage occurs, charge field will deform dielectric internal electric field, thus easily leading to occurrence discharge insulation damage. In this case, it necessary carry out characterization oil-paper interface avoid these consequences. This paper analyses accumulation...

Oil-paper insulation system is an extraordinarily essential of converter transformers as well HVDC bushings. When the changes its state, such switching thyristors, operating over-voltage appears, and charge will deform dielectric internal electric field, thus easily leading to occurrence discharge or failure, so accumulation dissipation on oil-paper under pulse voltage need more investigation. This paper studies surface behavior double-layer inducing electrification was used composite....

Although the cores made with amorphous metal alloy have lowered no‐load losses compared orientation silicon steel cores, a high cost and noise level are inevitable because magnetostriction for strip is larger than ordinary one. This study mainly focused on experimental systems methods magnetic properties measurement, vibration characteristics of combinations. The composite were also studied. influence annealing process energy, core analysed in detail as well. All testing results analysis...

Noise pollution is an important issue in modern society. This paper mainly concerned with noise suppressing of amorphous metal alloy core superconducting distribution transformers (AMSDTs). A microperforated sound absorption structure based on the electroacoustical equivalent circuit model was designed and installed inner sides box circumference. Up to now, there have been few investigations reports its application transformer. In this paper, single double panels (MPPs) were circumference...

GMP ligand based LCP sensor for Cit with high sensitivity and selectivity was constructed.

Forced convection of insulation oil is the main heat transfer mode in large power and ultra‐high voltage (UHV) transformers. The electrification risk caused by friction between mineral pressboard has been suspected to be responsible for several failures. measurement was carried out a rotation system. influences temperature, speed, time, applied electric field fresh dry transformer have investigated system, respectively. A comparison these results made, related theory can used explain...

In this research, nano-TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> of various diameters is added to cellulose and pressboard made enhance its anti-thermal aging characteristics. After thermally the samples, partial discharge inception voltage (PDIV), AC breakdown strength relative permittivity are measured. The results show that dielectric properties with 10 nm TiO has highest due closer match permittivity. mechanical higher than...

Forced convection of insulation oil is the main heat transfer mode in large-power and ultra-high-voltage (UHV) transformers. The electrification hazard caused by physicochemical phenomena between mineral pressboard has been suspected to be responsible for several failures. measurement was carried out an flow system. influences temperature, velocity, time applied electric field fresh dry transformer have investigated a experimental results from system show that streaming current increases...

Large power transformers have severe vibration and noise problems.Thus, as the source of noise, it is vitally important to accurate core calculations.The calculation incredibly difficult consider complex propagation pathway in clamp Amorphous Metal Alloy Core Distribution Transformer (AMACDT).To understand characteristics AMACDT, this manuscript provides a different approach on investigation an SCBH15-200/10 type.Based displacement (AMACDT), they are obtained solved using Finite Element...

Objective: Open surgery is the most common treatment of thyroglossal duct cyst (TGDC), but it leaves obvious neck scarring. This study aimed to explore feasibility and strategy total endoscopic procedure by breast approach avoid such scarring on neck. Materials Methods: reviewed 13 patients who underwent resection TGDC 15 open TGDC. We compared analyzed factors including operative time, estimated blood loss, postoperative hospitalization, complications, cosmetic effect. Results: The was...