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Machine tool ability representation: a review

Sadasivam L., Archenti A., Sandberg U.

Journal of Machine Engineering

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2018

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Vol. 18, No. 2

5--16

EN

Smart manufacturing and predictive maintenance are current trends in the manufacturing industry. However, the holistic understanding of the machine tool health condition in terms of accuracy, functions, process and availability is still unclear. This uncertainty renders the development of models and the data acquisition related to machine tool health condition ineffective. This paper proposes the term machine tool ability as an interconnection between the accuracy, functions, the process and the availability to overcome the lack of the holistic understanding of the machine tool. This will facilitate the further development of qualitative or quantitative methods as well as models. The research highlights the challenges and gaps to understand the machine tool ability.

2

Samozaleczanie i samonaprawa betonu

Łukowski P., Adamczewski G.

Inżynieria i Budownictwo

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2017

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R. 73, nr 8

421--424

PL

Przedstawiono koncepcję samozaleczania i samonaprawy betonu. Omówiono mechanizmy oraz sposoby sterowania tymi zjawiskami. Zwrócono uwagę na zastosowanie rozproszonych nośników substancji naprawczej, w tym możliwość wykorzystania żywicy epoksydowej bez utwardzacza. Wskazano dotychczasowe osiągnięcia oraz problemy do rozwiązania, wytyczające niezbędne kierunki dalszych badań w tym zakresie.

EN

The paper deals with the idea of self-healing and self-repair of cement concrete. The mechanisms of these phenomena have been described together with the methods of their controlling. The particular attention has been paid to the use of dispersed carriers of the repair mean, including the possibility of application of epoxy resin without a hardener. The present achievements have been pointed out as well as the problems to resolve.

3

Possibilities of seed quality improvement in Miscanthus sinensis (Andersson)

Orzeszko-Rywka A., Rochalska M.

Journal of Research and Applications in Agricultural Engineering

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2016

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Vol. 61, nr 4

84--88

EN

Miscanthus sinensis (Andersson) is a perennial grass producing high amounts of biomass. I It can be used for energetic purposes through burning or biogas production. A main problem in this crop cultivation consists in vegetative, expensive method of propagation. First preliminary research on seed quality improvement is carried out in order to enable propagation on a large scale. The object of presented experiment was to find out the reason for low germination ability and to search methods of seed quality improvement. Miscanthus seeds were treated with sodium hypochlorite, commercial micronutrients seed fertilizer and commercial bacteria seed treatment, ash and plasma. The ability and speed of germination and root and shoot length were measured. Tetrazolium test and microscopic observations of seeds were done. Fragility and susceptibility to damage and low vitality of embryos mean that further work is needed on the genetic characteristics and methods of seed harvesting as well as postharvest processing of this species.

PL

Miskant chiński jest wieloletnią trawą wytwarzającą duże ilości biomasy. Jest użytkowany w celach energetycznych poprzez spalanie lub produkcję biogazu. Problemem w upowszechnieniu tej uprawy jest wegetatywny, drogi sposób rozmnażania. Trwają pierwsze prace nad poprawą jakości nasion miskanta, tak aby rozmnażanie generatywne na szeroką skalę było możliwe. Celem przedstawionych badań było określenie przyczyn niskiej zdolności kiełkowania nasion oraz poszukiwanie metod poprawy ich wartości siewnej. Nasiona miskanta były traktowane chlorkiem sodu, preparatami bakteryjnymi i mikroelementami, popiołem a także plazmą. Badano zdolność i szybkość kiełkowania oraz długość korzeni zarodkowych i kiełków. Na nasionach wykonano także test tetrazolinowy oraz obserwacje mikroskopowe. Kruchość nasion i podatność na uszkodzenia oraz niska żywotność zarodków powodują, że konieczne są dalsze prace dotyczące cech genetycznych i metod zbioru i czyszczenia nasion tego gatunku.

4

Impact of multi-task on symptomatic patient affected by chronical vestibular disorders

Regrain E., Regnault P., Kirtley Ch., Shamshirband S., Chays A., Boyer F.-C., Taiar R.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 3

123--129

EN

Purpose: After a vestibular deficit some patients may be affected by chronical postural instability. The aim of this study was to identify the emotional and cognitive factors of these symptomatic patients. In particular, the double cognitive task and the anxiety disorder were identified by our patients. Through a retrospective study, 14 patients (65.4 ±18 years) participated in the experiment. Method: The experimentation consists in the study of the standing position of our patients through the aggregate of the trajectories of the center of pressure (COP) using a force plate device. With the aim of isolating the emotional and cognitive influence, this experimentation was defined in two conditions. In the first one, the patients were asked to maintain their balance without additional tasks. In the second one, the patients were submitted to an additional cognitive arithmetic task. The stabilogram surface, length (the forward and backward displacement distance during deviations in COP), lateral and the antero-posterior deviations were assessed. Results: Our results showed an increase of postural instability of patients affected by chronical vestibular disorders when submitted to the double task. The patients submitted to the cognitive task present a larger surface of activity in comparison with the free-task one (Wilcoxon test p-value equals p = 0.0453). In addition, their displacements inside this area are more important (p = 0.0338). The COP of all our patients deviated forward in the presence of the double task. Conclusion: The increase in instability during the double cognitive task could be explained by an additional stress caused by the desire to make a success of the cognitive task.

5

The effect of intercropping of broad bean (Vicia faba L.) with sweet alyssum (Lobularia maritima L.) and white mustard (Synapis alba L.) on the energy and the ability of seed germination

Biniaś B., Gospodarek J., Rusin M.

Journal of Research and Applications in Agricultural Engineering

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2015

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Vol. 60, nr 3

11--15

EN

The aim of this study was to determine the impact of the accompanying plants: sweet alyssum (Lobularia maritima) and white mustard (Synapis alba L.) on the energy and the ability of germination of broad bean (Vicia faba L.) seeds variety Bartek. In the experiment, the analyzed broad bean seeds were obtained from a field experiment, in which it had been grown along with two other plants in varying spacing (the distances between rows were 50, 65 and 80 cm) and in homogeneous cultivation (the distances between rows were 50 cm). Broad bean in a homogeneous cultivation served as a control. In addition, the broad bean seeds from homogeneous cultivation subjected to a standard protection by chemical insecticides were also analyzed. The measurement of the energy and ability of broad bean seeds germination was carried out in the laboratory conditions, in accordance with generally accepted standards. The morphological parameters of seedlings were also evaluated (the length of the root and the above ground parts and the number of the lateral roots longer than 2 mm). There was no significant influence of the neighbourhood of sweet alyssum (Lobularia maritima L.) and white mustard (Synapis alba L.) on the germination energy and ability of broad bean seeds. The neighbourhood of sweet alyssum did not significantly affect the length of the primary root and the above-ground part of the broad bean seedlings and the number of the lateral roots. However the neighbourhood of the white mustard contributed to the increase of the length of aboveground part of seedlings, but only in the highest applied spacing of rows.

PL

Celem badań było określenie wpływu rośliny towarzyszącej: smagliczki nadmorskiej (Lobularia maritima L.) oraz gorczycy białej (Synapis alba L.), na energię i zdolność kiełkowania nasion bobu (Vicia faba L.) odmiany Bartek. W doświadczeniu analizowano nasiona bobu pochodzące z doświadczenia polowego, w którym był on uprawiany współrzędnie z dwoma w/w roślinami w zróżnicowanej rozstawie (odległość między rzędami: 50, 65 i 80 cm) oraz samodzielnie (odległość między rzędami 50 cm). Bób w uprawie jednorodnej stanowił kontrolę. Dodatkowo analizowano także nasiona bobu pochodzące z uprawy jednorodnej i poddanej standardowej ochronie z użyciem insektycydów chemicznych. Ocenę energii i zdolności kiełkowania nasion bobu przeprowadzono w warunkach laboratoryjnych, zgodnie z ogólnie przyjętymi normami. Ocenie poddano również parametry morfologiczne siewek (długość korzenia głównego i części nadziemnej oraz liczbę korzeni bocznych dłuższych niż 2 mm). Nie stwierdzono istotnego wpływu towarzystwa smagliczki nadmorskiej (Lobularia maritima L.) oraz gorczycy białej (Synapis alba L.) na energię i zdolność kiełkowania nasion bobu. Sąsiędztwo smagliczki nadmorskiej nie wpłynęło w sposób istotny na długość korzenia głównego i części nadziemnej siewek bobu oraz na liczbę korzeni bocznych. Z kolei towarzystwo gorczycy białej, ale tylko przy największej zastosowanej rozstawie, przyczyniło się do zwiększenia długości części nadziemnej siewek.

6

Is math a gift?

Bartošová B.

Scientific Issues of Jan Długosz University in Częstochowa. Mathematics

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2014

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Vol. 19

25--28

EN

“I am just not a math person” is a sentence we can hear very often these days. Students use it as an excuse any-time they do not know or understand anything. But is Maths really some gift a person gets or is not? Or is it more like ability which can be improved if practised enough? This is a brief preview of what do the Czech, Slovak and also foreign authors think of this issue.

7

Spin test : the ability of spin test method usage in thrusters' fault detection and isolation

Iwanicki L., Kyzioł L., Kozyra D., Tarsa R.

Journal of KONES

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2014

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Vol. 21, No. 4

177--182

EN

In the article below, we presented the possibility of „spin test“ method usage for medium rotational speed devices such as thrusters', which are used to enhance the maneuverability of maritime vessels. The reason for the analysis is the problem of eliminating the unwanted vibrations of thruster's propeller with commonly used methods. It is an innovative solution for accurate verification of the technical condition of screw propellers, which are the most common devices used as the propelling element of thrusters. In the introduction the possibility of thruster's diagnosis using „spin test“ has been described. Commonly used thrusters' and their working conditions were presented. In order to properly assess the technical condition of rotational speed devices, such as thrusters' propellers after their production or renovation it is vital to provide an additional diagnosis in the environment similar to working conditions. Secondly, the problem of spinning parts' vibration was described. „Spin test“ method presented here gives the ability of detailed analysis of spinning parts' vibration. The idea of a compact and easy to assemble station enabling to conduct such research has been shown. The station not only allows to measure the eigenfrequency of vanes' in normal mode and compare it with the previously calculated ones, but also enables material's endurance testing at speeds higher than nominal speed. Finally, we presented the range of using this method in different fields along with the benefits of ‘Spin Tests’.

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Methods for Refining Assessment of Test-Takers Based on Item Response Theory Model

Sokolov O., Molchanova O., Urbaniak W.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2011

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Vol. 15, No 2

191-202

EN

This research is devoted to assessment methods used in different test systems, including e-learning systems. The methods considered here are based on classical test theory and item response theory (IRT). We propose a new approach for improving the quality of assessment by diversifying evaluation points.

9

Assessment of Psychophysical Abilities of People with Disabilities During Occupational Rehabilitation

Kurkus-Rozowska B., Najmiec A., Tokarski T., Konarska M.

International Journal of Occupational Safety and Ergonomics

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2000

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Zeszyt Specjalny

127--134

EN

Designing objective and subjective methods of studying the abilities of disabled people is one of the most important things to be done before employing them. That is why new assessment methods are proposed. Evaluation as a testing procedure used for defining the abilities of disabled people - general capacity, range, and strength of the main groups of muscles and extremities, psychological tests, and many others-were developed by an interdisciplinary team. In total, 48 testing procedures, including physiological, psychological, and biomechanical ones, were prepared. We also propose another subjective assessment method because it is also very important to know what an individual person with disability needs, wants to do, or what kind of job he or she prefers. The subjective evaluation of abilities, possibilities, and needs might be done by using a questionnaire. These testing procedures offer a chance to use the same methods in all diagnostic centres so the criteria of health and work ability will be the same and easily comparable. Using the same tests for assessment will be helpful in observing the results and progress of medical, social, and vocational rehabilitation, too.