Noise-Reducing Fabric Electrode for ECG Measurement

In this work, we propose a fabric electrode with a special structure that can play the role of a noise reduction filter. Fabric electrodes made of the conductive fabric have been used for long-term ECG measurements because of their flexibility and non-invasiveness; however, due to the large impedance between the skin and the fabric electrodes, noise is easily introduced into the ECG signal. In contrast to conventional work, in which chip-type passive elements are glued to the electrode to reduce noise, the proposed electrode can obtain a noise-reduced ECG by changing the structure of fabric. Specifically, the proposed electrode was folded multiple times to form a capacitor with a capacitance of about 3 nF. It is combined with the skin-electrode impedance to form a low-pass filter. In the experiment, we made a prototype of the electrodes and measured ECG at rest and during EMG-induced exercise. As a result, the SNR values at rest and during exercise were improved about 12.02 and 10.29 , respectively, compared with the fabric electrode without special structure. In conclusion, we have shown that changing the fabric electrode structure effectively removes noise in ECG measurement.

Improvement of Filter-Fabrics for Mining Industry

The publication represents a review of three major types of filter-fabrics which are actively applied by domestic industrial enterprises. It's specially noted that contemporary high-technological manufacturing is impossible without highquality materials. The domestic technologies on filter-fabric production deserve attention unconditionally. Nevertheless, together with modernization of domestic industrial production, the technologies on filter-fabric accumulation have to change also. Namely that's why the functioning of such enterprises, which lean on competitive ability principles, product quality and its high technology, is utterly important now. In this regard, it represents an interest the activity of research-production enterprise Filter-Fabrics (RPE Filter-Fabrics Ltd) where from 2013, there has been started the manufacturing of innovational products which basis on, polyamide mini-thread and filament (complex) thread from high-test polyamide with glass filler which is stable to abrasion and having lower shrinkage during exploitation in the liquid medium. Besides, RPE Filter-Fabrics Ltd has significantly expanded filter-fabric market by the way of correction of thread basis and weft that has allowed to introduce the production on many concentrating factories.

Facile stearoyl chloride grafted cotton filter fabric and its application in oil-water separation

Chemical graft technology has been arisen widely interesting for its stronger chemical interaction between hydrophobic layers and substrates. Instead of coating technology based on physical function, chemical graft technology can produce hydrophobic membrane with more efficient durability for oil-water separation, which is essential in various industries like sewage treatment and oil spill. As cellulose-based material, cotton filter fabric is a flexible and degradable material with abundant hydroxyl groups, providing great possibility for graft reactions. Stearyl chloride has both hydrophobic alkyl chain and active acyl group, making it easily to be grafted onto cotton filter fabrics. Therefore, we propose to use stearyl chloride as hydrophobic layer and one-step modify cotton filter fabric. The obtained hydrophobic modified cotton filter fabric exhibits high contact angles (CAmax = 147o, CAavg = 141.8o), which only decrease slightly after 5 h droplet holding time (CAmax = 141o, CAavg = 126.3o). Besides, the modified sample also shows hydrophobic durability after three times gravity-drove oil-water filtration separation (CAmax = 137o, CAavg = 132.6o). This hydrophobic modified cotton filter fabric may have potential application in future oil-water separation and the stearyl chloride graft technology is an both effective and efficient way in hydrophobic modification.

Interaction of Particles and Filter Fabric in Ultrafine Filtration

Filter fabrics are frequently used in the separation of particle-laden process streams. Especially for low-concentration and fine particles in the micrometer range, separation on filter fabrics offers considerable advantages over alternative processes. In this process, the inflowing particles are prevented from flowing through the meshes of the fabric. This interaction results in the initial resistance of the filtration not corresponding to the pure water resistance of the filter fabric. Knowledge of this increase in resistance is rare, but it leads to a significant increase in flow resistance, and thus a strong reduction in the hydraulic load on the filter apparatus. Within the scope of this investigation, measurements for 30 filter fabrics and their interaction with 3 particle systems is presented and their effect on the flow behavior is discussed. The knowledge allows an improved design of filter apparatus by correcting the pure water resistance to the resistance with particle interaction and improve the performance of ultra-fine filtration process.