Hydrogen has been attracting attention as a fuel in the transportation sector to achieve carbon neutrality. storage liquid form is preferred locomotives, ships, drones, and aircraft, because these require high power but have limited space. However, hydrogen must be cryogenic state, wherein thermal insulation core problem. Inner materials, including glass bubbles, multi-layer (MLI), vacuum, vapo...

The paper deals with a new method of drying cellulose insulation, which uses methanol vapour present in nitrogen as medium. Compared to the insulation methods currently used industry, presented article has following advantages: there is no depolymerization because need heat use large-size and energy-intensive dryers whole process takes place tank transformer. Important parameters process, such ...

OBJECTIVES We sought to clarify the prevalence and characteristics of idiopathic ventricular tachycardia or premature ventricular contraction originating from the mitral annulus (MAVT/PVC). BACKGROUND Recent case reports have presented patients with MAVT/PVC. METHODS Electrocardiographic (ECG) characteristics and the results of electrophysiologic investigation and radiofrequency catheter ab...

OBJECTIVE Polyvinyl chloride (PVC) is commonly used as a catheter material in catheters for clean intermittent catheterization (CIC) but, owing mainly to environmental concerns, a PVC-free material has been proposed. The objective of this study was to compare patients' tolerability for catheters made of PVC and a newly developed PVC-free material. MATERIAL AND METHODS This was a prospective, ...

Abstract Liquefied natural gas (LNG), ethylene, ethane, propane, and other clean energy are often stored in a cryogenically frozen state on large scale. As the core equipment of cryogenic storage tanks, if different media stored, there certain differences design tanks. Although specifications differ little, is lack systematic research. This paper compares material, process, structure, construct...

Three polyphosphates were used as inhibitors for poly(vinyl chloride) (PVC) photodegradation. The polyphosphates were added to PVC at a concentration of 0.5% by weight. The PVC films (40 µm thickness) were irradiated at room temperature with ultraviolet (UV) light for up to 300 h. The changes in PVC films after irradiation were monitored by Fourier transform infrared spectroscopy, weight loss, ...

Reliability of electrical energy networks depends on quality and availability of electrical equipment like power transformers. Local failures inside their insulation may lead to catastrophic breakdowns. To prevent destroying events power transformers are e.g. tested on partial discharge (PD) activity. As testing is just snapshot information about transformers condition, permanent online monitor...

Power transformers reliability, amongst other things, depends on its insulation system. High voltage leads are a part of the system and should be properly insulated. This includes positioning an barrier between tank certain distance. distance affects safety factors (breakdown probability) for such The paper presents optimization process with which both breakdown probability vs. could minimized....