4466 research outputs found
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Interactive map for EUG Lodz 2022
No full textMore on the website „Życie Uczelni”– p.lodz.pl/enArtykuł zamieszczony jest w : Życie Uczelni : biuletyn informacyjny Politechniki Łódzkiej, nr 159, Luty 2022W Zatoce Sportu Politechniki Łódzkiej odsłonięto interaktywną mapę Europejskich
Igrzysk Akademickich Łódź 2022 (EUG 2022). Powstała ona w ramach
European Project Semester, zajęć realizowanych w Centrum Kształcenia
Międzynarodowego.
O pracy studentów pisze kierujący projektem dr hab. inż. Marcin Barburski,
prof. PŁ z Wydziału Technologii Materiałowych i Wzornictwa Tekstyliów.An interactive map was created
as part of the European Project
Semester, a project carried out
at the International Faculty of
Engineering
Non-stationary effects of ring rail movement in the high-speed ring spinning process with a superconducting magnetic bearing twisting system: problem and its solution
No full textCurrently, a major challenge in conventional ring spinning is to increase productivity. This is essentially
due to friction between the twisting elements. An innovative approach to the solution is the use of
frictionless twisting system based on superconducting magnetic bearing (SMB) system. However,
previous studies with the SMB system were mainly restricted to an angular spindle speed of up to 30.000
rpm because of: instabilities caused by the non-stationary process forces originating from the nonuniform
ring rail movement, complex interactions between the yarn dynamics and the bearing properties
of the SMB, aerodynamical subsonic flow regimes of the rotating yarn balloon etc. The ring-rail
movement must be taken into account especially at higher angular spindle speed, as a ring-rail cycle
occurs every few rotations of the spindle and results in fast-periodic variation of the balloon form, which
in turn leads to extreme yarn tension peaks. In this study, metrological investigations were conducted
considering the ring rail movement at different angular spindle speeds with the SMB twisting system to
understand the influence of the ring rail movement on the spinning stability, dynamic yarn path during
spinning process, balloon form etc. Moreover, a concept using servo motor driven lifting mechanism is
presented to solve the problem of non-uniform ring rail movement
Bacterial inhibition via carboxymethyl cellulose-containing electrospun mats loaded with nisin z peptide for potential chronic wound care
No full textNisin Z is an amphipathic peptide with a significant antibacterial activity against Gram-positive bacteria
and low toxicity in humans. Here, we report the production of nanofibrous mats by co-electrospinning
of the peptide with carboxymethyl cellulose (CMC) and poly(vinyl alcohol) (PVA) polymers for
prospective wound dressing applications. The mats were studied against four of the most common
bacteria found in chronic wounds. The evaluation of bacteria membrane permeability and the minimum
inhibitory concentration (MIC) showed that chelating agent ethylenediaminetetraacetic acid (EDTA)
can expand the activity of Nisin Z against Gram-negative bacteria. PVA (10 wt%)/CMC (3 wt%)
electrospinning nanofibers were successfully produced at a 70/30 % (v/v) polymer ratio. The addition
of Nisin Z to the polymer solutions did not alter the properties of the fibers
Experimental study of the tack of flax fibers based thermoplastic composite reinforcements
No full textIn this article we tested a flax fibres and polypropylene based composite reinforcement in order to
determine its adherence to other surfaces around the melting temperature of polypropylene at 165°C. A
rheometer with a thermal chamber is used to do a probe-tack test at a constant temperature. This test
consists in three steps, the compaction of the sample between two tabs, the relaxation and the separation
of the upper tab from the sample. Tackiness corresponds in the traction force measured during the
separation. No tackiness was measured during our first tests although we could observe residue on tab
surfaces. Further tests where the temperature is lowered beneath the solidification temperature of
polypropylene during the relaxation step will be done. Preliminary results for these tests are promising
Impact of the Covid-19 pandemic on light pollution of the night sky
No full textW 2020 roku, w związku z pandemią COVID-19 i zmniejszeniem
się nocnego ruchu drogowego, władze szeregu gmin w Małopolsce podjęły
decyzję o wyłączaniu ulicznego oświetlenia komunalnego w godzinach
nocnych. Jest to pierwszy taki przypadek, gdy przez część roku wyłączane było
oświetlenie uliczne, w dodatku na dużych obszarach oraz w miastach. W ten
sposób pojawiła się niezwykła sposobność wykonania analizy, jaki udział
w zanieczyszczeniu światłem ma oświetlenie komunalne ulic. W tym celu
wykorzystano zarówno istniejące w Krakowie i sąsiednich gminach stacje
monitoringu zanieczyszczenia świetlnego, jak również dane satelitarne
dotyczące wielkości radiancji pochodzącej z miejscowości, w których
następowało wyłączanie oświetlenia ulicznego. Stwierdzono, że po wyłączeniu
oświetlenia komunalnego jasność powierzchniowa bezchmurnego nieba
zmniejszała się o około 40%. W każdej z analizowanych miejscowości
stwierdzono również efekt znaczącego zmniejszenia się radiancji w efekcie
wyłączenia oświetlenia ulicznego. W przypadku całkowitego wyłączania
oświetlenia ulicznego w danej miejscowości wielkość ta zmniejszała się prawie
o 70%.In 2020, due to the COVID-19 pandemic and the decrease in public
traffic at night, the authorities of several municipalities in Lesser Poland
decided to turn off municipal lighting at night. This is the first time that street
lights have been turned off for such a long time and over such a large area,
including in urban areas. This gave a unique opportunity to analyse the share
of municipal lighting in light pollution. For this purpose, both the existing light
pollution monitoring stations in Kraków and the neighbouring municipalities,
as well as satellite data on changes in light radiance from the studied areas
were used. It was found that after switching off the communal lighting the
surface brightness of the cloudless sky decreased by approx. 40%. In each of
the analysed communes, the effect of a significant decrease in light radiance
as a result of switching off–street lighting was also found. In the case of
completely switching off-street lighting in a given locality, this value decreased
by almost 70%
Ergonomics multidisciplinary approach of 3D bodyscan of anthropometry
No full textNowadays artificial intelligence and update the concepts of modern technology and applications, 3D
BodyScan, whole body scanners are increasingly used as precise measuring tools for the rapid
quantification of anthropometric measures in multipurpose applications of Semi-industrial and
Production/Commercialization and studies. Such as: 1) In the garment industry. 2): In the Ministry of
Police 3): In the Ministry of Defence: 4): National Projects. 5): Car Furniture. By analyses of the use of
body measurements and posture information generated from body scan technology to facilitate
individual pattern creation and cutting is a state-of-the-art mass-customized approach of artificial
intelligence. The development of size charts for Identification production of human bodies. Throw:
Obtaining body measurements, statistically analysing measurements, Adding ease allowances,
formulating the size charts, fitting trials to test size charts of modelling by fuzzy logic. To provide
standard classification, size designations, and body measurements for consistent sizing of women’s
ready-to-wear Identification bodies for the guidance of those engaged in producing or preparing
specifications for patterns and ready-to-Identification. The measurements given in this standard are
body
Effect of oggtt on physicochemical properties, antioxidant activity and volatile compounds of noodles
No full textThe present investigation aimed to evaluate the effect of noodles supplementation with oggtt at (5,10,15 and 20%) on physicochemical properties, antioxidant activity as well as volatile compounds. The cooked noodles evaluation based on cooking quality like volume and cooking loss as well as colour changes. An increase in protein, fat and ash was observed with the increase of oggtt supplementation level in noodles. The whole wheat flour had the highest value of total phenolic (462.3 μg GAE g−1) compared to oggtt and all fortified noodles without cooking and after cooking. The fortification levels of 5 and 10% did not affect significantly on colour and overall acceptability of noodles. The panelists scores recommended the usage levels of 5 and 10% of oggtt noodles which did not changed significantly in comparison with control sample. The evaluation of oggtt incorporation in noodles volatile compounds performed using HS-GC/MS analysis. Thirty volatile compounds in cooked noodles after fortification with oggtt had identified. The main volatile compound herein was 2-pentyl furan, which represent 44.12, 20.14 and 18.75% in cooked control and fortified noodles with oggtt at 5 and 10% respectively
