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Implementing Scientific Research in Terms of its Efficiency with the QEEG Method
No full textThis article presents the concept of assessing the cognitive process based on
QEEG electroencephalographic research. Therefore, the main research problem
is an attempt to answer the question of whether and to what extent the use of
modern simulation programs in technical education affects the effectiveness
of education? What are imagination and creativity in the creative process in
terms of QEEG research? The effectiveness of education is a derivative of the
activity of the cognitive process during learning. The main purpose of the
research is to evaluate the work based on engineering projects carried out
in the simulation program. Brain mapping using modern medical equipment
allows for recording and observing the course of various waves and the
magnitude of the potentials generated by the nervous system to determine the
listener’s operability in the teaching process
Experimental abrasion analysis of textile capacitive sensors
No full textThis paper presents an experimental abrasion analysis of textile capacitive sensors based on Martindale
test. The textile sensor is manufactured with a well-known woven technology where some yarns are
replaced by electrical conductive yarn. Specifically, two types of conductive yarns were used to compare
the abrasion behaviour respect to conventional fabrics and the impact of abrasion on sensors
functionality. The results show that the integration of conductive yarn on fabric don’t reduce the fabric
lifetime and moreover the sensing behaviour remains unalterable during the lifetime of the textile
Analysis of the local yarn elongation states during the highly dynamic stitch formation process using the example of high performance warp knitting
No full textMost textile processing methods are dominated by highly inconstant and dynamic thread demands. In
terms of increasing production speeds in textile industry or the effort not to influence the fabric
appearance by machine stops etc., an effective control and parameterization of the machine is
indispensable. This requires precise knowledge of the actual condition of the thread during processing.
The state of the warp yarn sheet depends, for example, on the current yarn tension or elongation. While
the yarn tension can be easily measured with mobile yarn tension meters, the actual elongation of the
yarns is more difficult to observe in the highly dynamic process.
Since high-speed warp knitting is one of the most dynamic textile production processes, an observation
of the actual elongation states of the yarns to be processed during warp knitting is performed using highspeed
optical image acquisition and image recognition algorithms. These experiments and the results
are presented in this paper
Friction spun yarns with high RCF content for thermoset composites
No full textThermoplastic composites based on hybrid yarn structures consisting of recycled carbon fibre (rCF) and
thermoplastic fibres (rCF content approx. 50 weight percentage) achieve high mechanical properties
because of a long fiber length, homogeneous mixing and even yarn structure [1]. However,
manufacturing of yarns with high rCF content (>90%) required for thermoset composites is still not
realizable. Because of the special properties of rCF such as low shear strength, smooth fibre surface and
high brittleness, high shortening (≥ 70%) in fibre length of rCF occurs during different processing steps
of spinning [2]. The wide distribution of rCF fibre length arising especially during carding of pure rCF
is regarded as very critical. In addition to this, lack of crimp in rCF leads to drafting error during drawing
and spinning process. As a result, the quality of a yarn with high rCF content is still not acceptable. For
this purpose, investigations are carried out in this work to enable gentle processing of rCF to produce
slivers consisting solely of rCF. Furthermore, different core sheath yarn structures with rCF content
(>90%) have been developed on a DREF-3000 friction spin machine for thermoset composites
Effects of the alginate and CACL2 concentrations imparting mechanical and morphological properties of wet spun filaments
No full textAlginate fibers were used essentially in wound dressing due to his biocompatibility and were prepared
by the wet-spinning process using a sodium alginate solution and a calcium chloride solution (CaCl2) as
a coagulation bath. The effects of the wet-spinning solvent, coagulating solution, and polymer
concentration on corresponding fiber structure were addressed to achieve homogeneous fibers with
controlled morphology and suitable mechanical properties. Fiber average diameter, surface state, and
fiber homogeneity were assessed by optical and scanning electron microscopies to screen the influence
of the formulation and process parameters on the morphological characteristics of the fibers.
Furthermore, mechanical properties were studied after determining the monofilament finesses. At an
alginate concentration of 8 wt.%, the tenacity and elongation at break of the resulting alginate fibers are
the best results. Finally, preliminary studies demonstrated that optimization of CaCl2 concentration and
coagulation time resulted in improved fiber regularity and mechanical properties. Thus, optimization of
the process and formulation parameters were obtained for a concentration of 8 wt.% alginate, 1 wt.%
CaCl2, and a coagulation time of 5 minutes. The resulting spun fibers had an average tenacity of
11 cN/Tex and an average elongation at break of 24%. This is promising for the wet spinning process
which can modify the fibers properties
Determining propertires of polyures coating as a material potentially strengthening structural elements
No full textThe paper discusses the results of experimental research on polyurea. In authors’ opinion, this
material could be used to improve load-carrying capacity and integrity of structural elements made of various
materials. The paper presents the results of research on basic mechanical properties of polyurea, its impact on
integrity of cellular concrete specimens and full-scale concrete rings. The additional polyurea layer on outer
surfaces of test specimens improves mainly their integrity following their complete failure. It must be noted,
however, that when the additional layer is present, it does not improve all strength properties of test specimens
such as resistance to compression of cellular concrete specimens. It was revealed that this property may be
negatively influenced by the level of constrainment
TUL will investigate the nature of work in a post-pandemic future
No full textMore on the website „Życie Uczelni” – p.lodz.pl/enArtykuł zamieszczony jest w : Życie Uczelni : biuletyn informacyjny Politechniki Łódzkiej, nr 159, Luty 2022Na Politechnice Łódzkiej powstanie laboratorium badawczo-dydaktyczne
RobOKOp-LAB wykorzystujące okulografię (śledzenie aktywności wzrokowej).
Na ten cel Samorząd Województwa Łódzkiego przyznał uczelni 385 tysięcy
zł dofinansowania.A research and teaching laboratory using oculography:
RobOKOp-LAB will established at Lodz
University of Technology. The local government of
the Lodz Voivodeship awarded TUL a grant of 385
thousand PLN for this laboratory