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Heating profile of electro-conductive weft-knitted composite fabrics during cyclic deformation
No full textThe goal of this research was to learn more about how heat is generated during cyclic deformation of
highly conductive knitted composite fabric. The heating materials in this investigation were silver (Ag)
coated polyamide (PA) yarn knitted into a pattern. At various time intervals, the temperature generated
on the fabric surface was measured. An Instron tensile testing machine was used to perform the cyclic
stress strain in the course direction of the developed fabric. The temperature on the conductive fabric
surface increased rapidly for the first two minutes, then slowly afterward, eventually levelled off at a
specific point. Heat generation is negatively influenced by stretching and cyclic deformation. Heat
generation was also affected by the amount of conductive yarn used in the knitting design. The materials
developed in this work could be employed in orthopaedic compression support to offer sufficient
heating
A study on barrier performance of medical face masks
No full textThe sudden outbreak and rapid transmission of SARS-Covid-19 virus has urged people around the world
to adopt safety measures to help stop the spread of this infectious disease. Thus, there comes a sudden
increase in demand for PPEs such as face masks and gowns. This increase in demand has paved the way
for low-quality medical face masks to the public, causing a serious threat to the contamination of the
Covid-19 virus. Therefore, to verify the real picture of the performance quality of medical face masks,
we carried out a study to check their barrier performance as per the requirements of International
Standards EN 14683 and ASTM F2100. We conducted the bacterial filtration efficiency, particle
filtration efficiency and differential pressure tests on all the medical face masks samples and found that
almost all the masks fall under 95% filtration to bacterial aerosol requirement, 95% filtration efficiency
to latex sphere, and had differential pressure in limits. Our study has also concluded a correlation
between these performance criteria, and it would be a great help and time saving if we adopted the
findings of this research. The out has helped to create public confidence in their quality performance
Mass transport and changes in the saccharide profile during osmotic dehydration of apricot and chokeberry fruits
No full textThe aim of the study was to determine the effect of osmotic dehydration in sucrose solution on the level and profile of the main saccharides in frozen
chokeberry and apricot. A 50°Bx sucrose solution at a temperature of 25, 35, 45 and 55°C was used in the tests. The influence of temperature and
dehydration time on the dry matter content in the tested fruits was demonstrated. Both in apricot and chokeberry the highest increase was recorded in the first hour of the process, for apricots to the level of 25.1-32.4%, for chokeberry 30.4-33.4%. The use of the highest temperature (55°C) increased the content of glucose and fructose while reducing the amount of sucrose (hydrolysis); at 25-35°C the opposite effect was obtained. At low temperatures, chokeberry was not very susceptible to migration of sucrose. Also, the transport of water was not intense. There was no correlation between the temperature of the process and the increase in dry matter in the sample. The greatest loss of water, i.e. 1 g H2O/g i.d.m., occurred after five hours at 55°C. Under analogous conditions, apricots showed a higher water loss, at the level of 4.68 g H2O/g i.d.m. At 25°C, after the first hour of dehydration, the energy value of saccharides in apricots was 315 kJ/100 g; at 55°C, after 3÷5 hours it fluctuated around 500 kJ/100g. Dehydrated chokeberry was characterized by approx. 1.5÷2 times lower energy value than apricot
Effect of polyester fibre shrinkage on construction characteristics of polyester/wool woven fabrics
No full textThis work aimed to study the effect of polyester fibres with different shrinkage on the structural
characteristics (warp densities, weft densities and weight per square meter) of the various blend wool
and polyester fabrics, after a normal clean finish. The main conclusions to be highlighted are: polyester
fibres with 11% shrinkage give rise to higher weft densities and consequently fabrics with a higher
weight per square meter compared to fabrics produced with polyester fibres with 4% shrinkage. In this
context, and if for technical and/or commercial reasons, there is a need to change the type of polyester
fibre, it is not enough to consider only the length, diameter, crimp and tenacity of the fibre, but also its
shrinkage
Nagrody PAN dla młodych uczonych
No full textArtykuł zamieszczony jest w : Życie Uczelni : biuletyn informacyjny Politechniki Łódzkiej, nr 159, Luty 2022Wyłoniono laureatów Nagrody za Wybitne Osiągnięcia Przyczyniające się do
Rozwoju Nauki dla Młodych Uczonych Pracujących na Terenie Województwa
Łódzkiego za rok 2020. Przyznali je Łódzki Odział Polskiej Akademii Nauk oraz
Konferencja Rektorów Łódzkich Uczelni Publicznych
Inspirująca instalacja
No full textArtykuł zamieszczony jest w : Życie Uczelni : biuletyn informacyjny Politechniki Łódzkiej, nr 159, Luty 2022W konkursie „Inspiracje” dla młodych twórców sztuki sukces odniosła studentka
wzornictwa, zdobywając pierwszą nagrodę „Złotą Paletę 2021”
Tunable silica nanofibrous structures in view of resolving challenging purification and separation obstacles
No full textElectrospinning of polymer nanofibers has been studied extensively and has shown to be possible via
stable, reproducible and controllable processes. The development of more inert nanofibers with higher
thermal and chemical resistance extends the application field towards challenging purification and
separation obstacles of today. By direct electrospinning of a tetraorthosilicate (TEOS) based sol–gel
solution, without a sacrificing carrier polymer, dense ceramic silica nanofibers can be produced. A
humidity or temperature induced wettability-switch from highly hydrophobic after electrospinning to
superhydrophilic makes the resulting silica nanofibrous membranes ideal for fast gravity-driven
separation, especially upon tuning the surface chemistry and the functionalization. This is showcased
for the separation of immiscible liquids and the photocatalytic degradation of organic micro-pollutants
XXVII LSCE 2021: Lightweight Structures in Civil Engineering. Contemporary problems. Monograph
No full textCover design: Ewelina KubackaTechnical editing and typesetting: Tymoteusz Konieczn