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Wyszukujesz frazę "Butterfly" wg kryterium: Temat


Tytuł:
An approach for butterfly conservation through setting up a garden in an urban area, Kolkata, India
Autorzy:
Thakur, Debapriya Chakraborty
Chakrabarti, Pinakiranjan
Chaudhuri, Anuradha Chaudhuri
Powiązania:
https://bibliotekanauki.pl/articles/1178712.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
butterfly garden
habitat restoration
butterfly conservation
urbanization
human interference
eco-restoration
Opis:
Biodiversity declines due to unplanned urbanization as well as anthropogenic activities. It has already been documented that native flora and fauna are disappearing as an impact of biodiversity loss. There should be urgent need to restore our lost habitats through conservation techniques. The present study was aimed to conserve and restore lost habitat of pollinators with special reference to butterflies in an urban area through setting up a garden. The study was divided into two phases. In the first phase survey of butterflies found within an unmanaged garden in the campus (Lady Brabourne College, Kolkata) was performed prior to construction activity (May 2012 to October, 2012) and it was observed previously total 31 species of butterfly visited the garden. Developmental activities caused a sharp decline in their population causing an approach to relocate our garden in another area of college campus. In the second phase, setting up a garden in an alternative sites of same campus with plantation of host plants preferred by butterfly species was done and observed for butterfly visit. A slow increase in sighting over a study period of two years (between October, 2012 to June, 2015) was recorded. The results clearly indicate that total 43 species of butterflies were recorded in the garden including 9 species, which were not seen before and with 8 species completing their life cycles. In conclusion, declining of butterfly species can be increased and conserved through setting up of a garden. Presently the garden is flourishing but problems of increase in natural enemies as birds and other anthropogenic disturbances such as excess noise and vibration, street lighting, human interference etc. should be addressed in future within present conservation approach.
Źródło:
World Scientific News; 2017, 61, 2; 69-85
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Young Swimmers’ Technique with Tec Pa Tool
Autorzy:
Papadimitriou, Konstantinos
Papadimitriou, Nikos
Gourgoulis, Vassilios
Barkoukis, Vassilis
Loupos, Dimitris
Powiązania:
https://bibliotekanauki.pl/articles/1627256.pdf
Data publikacji:
2021-09-10
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
Butterfly
backstroke
breaststroke
freestyle
Opis:
Aim of the current study was to examine the reliability and validity of a new tool, developed for the assessment of young swimmers’ technique in all swimming strokes. The sample of the study was 119 swimmers (63 boys and 56 girls), aged 8 to 12 years old. To evaluate swimmers’ technique, each of them performed 15m for each one of the swimming strokes in individual medley order. Α digital camera, placed 5m above the pool’s surface, recorded the swimming bouts. Three experienced swimming coaches evaluated the recorded videos with the new technique’s evaluation tool named Tec Pa. Tec Pa assess six important key points of swimming technique in each stroke. According to the results no statistical significant differences were showed between the scores of the swimmers’ evaluation by the three coaches (p > 0.05). Moreover, the association between the scores was statistically significant high (τ = 0.863; p < 0.05). The findings of the current study reveal that Tec Pa is valid and reliable for the young swimmers’ technique evaluation, with high strength of association. Also, Tec Pa can be used by the coaches to enhance the free observation method, which is mainly used, in young swimmers.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2021, 34, 2; 39-51
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interpolation of irregular sets of points by subdivision surfaces in NuTria modeller
Interpolacja nieregularnych zbiorów punktów za pomocą powierzchni subdivision w modelerze NuTria
Autorzy:
Putz, B.
Matyskieła, P.
Powiązania:
https://bibliotekanauki.pl/articles/258294.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
interpolacja
triangulacja
metoda Butterfly
siatka trójkątów
wielokrotne podziały
meshes
interpolation
subdivision
triangulation
Butterfly method
refinement
Opis:
The paper presents the solution of the problem of interpolation the irregular set of 3D data points by a surface represented as the mesh of triangular faces. The surface should be smooth with some tolerance given. The task has been solved in a non-trivial way, with the use of known algorithms, in two steps. First the input points are triangulated by the Ball Pivoting Algorithm, originally designed for scanned point clouds. Then the modified Butterfly subdivision algorithm is performed. The implementation is dedicated for the NuTria modeller, destined for bent metal plates.
W artykule przedstawiono rozwiązanie problemu interpolacji nieregularnych zbiorów punktów za pomocą siatek trójkątów tworzących powierzchnię o gładkości zbliżonej do C1 z zadaną tolerancją. Zadanie zostało wykonane w niezbyt typowy sposób z wykorzystaniem znanych algorytmów: algorytmu triangulacji metodą przetaczającej się kuli i algorytmu iteracyjnych podziałów zmodyfikowaną metodą Butterfly. Wynikiem implementacji jest moduł interpolacji zadanego zbioru punktów w modelerze NuTria, przeznaczonym do modelowania blach giętych w MSP.
Źródło:
Problemy Eksploatacji; 2007, 3; 185-194
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Nectar Plant Preference of Butterflies at Juvenile Detention Center, Barasat, West Bengal, India
Autorzy:
Chattopadhyay, Upasana
Powiązania:
https://bibliotekanauki.pl/articles/1193619.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Butterfly
Nectar
Plant Preference
West Bengal
Opis:
Nectar is the primary nutrient source for adult butterflies. Plant species vary in their nectar content that may influence the biological attributes of the dependent life forms. Butterflies too differ in the range of available nectar resources for exploitation. Seven flowering plant species were selected in the study area, Kisholoy, Juvenile Detention Center, Barasat, where butterflies visit the most. Data was generated from three individual plants of each of the seven plant species. Each plant individual was observed for scheduled time period in the morning to record the encounters of butterfly species. Thirty eight [38] butterfly species of five [5] families were recorded during the study period. It was found that, the encounter frequencies of butterfly species varied for different nectar plant species. It was also observed that butterflies of a particular family preferred a specific nectar plant species or even a particular plant of a selected species. None of the seven nectar plants did attract members of all the five butterfly families. Lycaenids were found to be the most frequent visitors in different nectar plants like Aerva lanata, Acmella uliginosa and Sida sp. In case of Mikania micrantha, nymphalids were frequent visitors following lycaenids.
Źródło:
World Scientific News; 2017, 71; 70-77
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
NuTria - system of modelling of NURBS and triangulated surfaces
NuTria - system modelowania powierzchni NURBS i powierzchni triangulowanych
Autorzy:
Putz, B.
Przybylski, M.
Kaźmierski, S.
Matyskieła, P.
Zagroba, K.
Powiązania:
https://bibliotekanauki.pl/articles/258296.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
CAD
CAGD
powierzchnia swobodna
NURBS
subdivision
triangulacja
metoda Butterfly
free-form surface
triangulation
Butterfly method
Opis:
The paper presents the idea of a 3D modeller dedicated to bent metal plates modelling, designed as a part of a greater application and destined for small and medium-sized enterprises. The aim of the application is to deliver a simple tool for free form surface modelling in two independent modes: as a rectangular parametric NURBS surface defined by regular net of points or alternatively as a surface smoothly interpolating an irregular set of data points, exposed to the process of triangulation and multiple subdivision of mesh of triangles.
W artykule zaprezentowano modeler powierzchni swobodnych zaprojektowany i zaimplementowany z przeznaczeniem do wdrożenia w małych i średnich przedsiębiorstwach. System pracuje w dwóch niezależnych trybach: NURBS i Triangulacja. W trybie NURBS służy do modelowania gładkich powierzchni o ciągłej krzywiźnie, zadanych regularnymi siatkami punktów. W trybie Triangulacja (Mesh) służy do wprowadzania nieregularnych zbiorów punktów i generowania na ich podstawie powierzchni interpolujacej. Zadanie to rozwiązano za pomocą triangulacji, a następnie iteracyjnego zagęszczania siatek (tzw. subdivision) z użyciem zmodyfikowanej metody Butterfly. Zapis wyników działania w obu trybach do postaci plików DXF umożliwia przekazywanie danych do innych aplikacji, w celu ich późniejszego wykorzystania do analiz metodą elementu skończonego, w procesie obróbki zaprojektowanej powierzchni itp.
Źródło:
Problemy Eksploatacji; 2007, 3; 175-184
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiana i uczenie się w perspektywie edukacji dorosłych. Przykład projektu Lives in changing „Butterfly”
Change and learning from the perspective of adult education. The example of the project Live in changing “Butterfly”
Autorzy:
Dubas, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/418127.pdf
Data publikacji:
2014
Wydawca:
Akademickie Towarzystwo Andragogiczne
Tematy:
zmiana; uczenie się
edukacja dorosłych
projekt Lives in changing „Butterfly”
change
learning
adult education
Project Lives in changing „Butterfly”
Opis:
Zagadnienia poruszane w poniższym tekście odnoszą się do zasadniczej diady w teorii i praktyce edukacji dorosłych, jaką stanowi uczenie się i zmiana. Poniżej analizowana jest kategoria pojęciowa „zmiana”, w szczególności zaś rozumienie zmiany społecznej, zmiany rozwojowej i zmiany osobowej. Tekst ujawnia kategorię zmiany w refleksji andragogicznej, najczęściej odnoszonej do funkcjonowania systemu edukacji dorosłych. Na przykładzie projektu edukacyjnego Lives in changing „Butterfly” zostanie ukazana zmiana spowodowana edukacją/uczeniem się w wyniku zastosowania edukacyjnej metody warsztatów przyszłości. Rezultaty projektu mają odniesienie do teorii i praktyki procesu uczenia się dorosłych.
This article focuses on the issue of main dyad in the theory and practice of adult education, which is learning and change. The conceptual category of “change” is being analyzed and particular attention is devoted to the understanding of social, developmental and personal change. The text reveals the category of change from the andragogical perspective being most often applied to the functioning of adult education system. Finally, with regard to the educational project Lives in changing “Butterfly”, the change caused by education/learning, resulting from the application of educational method of the workshops of the future will be shown. The results of the project may be applied to the theory and practice of adult’s learning process.
Źródło:
Rocznik Andragogiczny; 2014, Tom 21; 459-481
1429-186X
2391-7571
Pojawia się w:
Rocznik Andragogiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bionics in aviation
Bionika w lotnictwie
Autorzy:
Skalski, P.
Powiązania:
https://bibliotekanauki.pl/articles/36389475.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
bionics
aviation
butterfly wing
bionika
lotnictwo
skrzydło motyla
Opis:
In the paper bionics as a field of knowledge and inspiration in the aviation technologies is presented. Bionics is a branch of science on the borderline of art and biology that studies the way living organisms work, as well as their structure, in order to use the results to build technical devices. In the introduction part definition of bionics is described. In the next part of this document the aviation technologies inspired by nature is depicted. Then, technologies inspired by the butterfly wing are presented. The paper ends with conclusions.
W niniejszej publikacji bionika jest przedstawiona jako obszar wiedzy i inspiracji w technologiach lotniczych. Bionika jest dziedziną nauki na pograniczu sztuki i biologii, która bada funkcjonowanie żywych organizmów, a także ich budowę, w celu wykorzystania uzyskanych wyników do budowy urządzeń technicznych. We wprowadzeniu została opisana definicja bioniki. W kolejnej części pracy omówiono technologie lotnicze inspirowane naturą. Następnie, są zaprezentowane technologie inspirowane skrzydłem motyla. Praca kończy się podsumowaniem.
Źródło:
Transactions on Aerospace Research; 2018, 3 (252); 99-108
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes is genes coding for laccases 1 and 2 may contribute to deformation and reduction of wings in apollo butterfly (Parnassius apollo, Lepidoptera: Papilionidae) from the isolated population in Pieniny National Park (Poland)
Autorzy:
Łukasiewicz, Kinga
Węgrzyn, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1038862.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
apollo butterfly
deformed wings
reduced wings
genes of laccases
Opis:
An isolated population of apollo butterfly (Parnassius apollo, Lepidoptera: Papilionidae) occurs in Pieniny National Park (Poland). Deformations and reductions of wings in a relatively large number of individuals from this population is found, yet the reasons for these defects are unknown. During studies devoted to identify cause(s) of this phenomenon, we found that specific regions of genes coding of enzymes laccases 1 and 2 could not be amplified from DNA samples isolated from large fractions of malformed insects while expected PCR products were detected in almost all (with one exception) normal butterflies. Laccases (p-diphenol:dioxygen oxidoreductases) are oxidases containing several copper atoms. They catalyse single-electron oxidations of phenolic or other compounds with concomitant reduction of oxygen to water. In insects, their enzymatic activities were found previously in epidermis, midgut, Malpighian tubules, salivary glands, and reproductive tissues. Therefore, we suggest that defects in genes coding for laccases might contribute to deformation and reduction of wings in apollo butterflies, though it seems obvious that deficiency in these enzymes could not be the sole cause of these developmental improperties in P. apollo from Pieniny National Park.
Źródło:
Acta Biochimica Polonica; 2016, 63, 1; 177-180
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mimetic Relationships of Butterflies, Commonly Found at Taki, North 24 Parganas, West Bengal
Autorzy:
Ghosh, Srinjana
Saha, Sumana
Powiązania:
https://bibliotekanauki.pl/articles/1192159.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Butterfly
Mimetic relationships
Host and Nectar plants
Conservation
Taki
Opis:
Coloration and mimicry are the naturally selected survival tools for lepidopterans, both in larval and adult life either playing the protective or aggressive or advertising or cryptic or camouflaging mechanisms. Besides being nature’s priceless artwork, butterflies are one of the most beneficial terrestrial insects, playing a major role as pollinators and an essential component of commercial agriculture, horticulture, wild plant and animal diversity. They also play role as bioindicators. The natural distribution of butterfly populations in any local habitat is primarily defined by the distribution of their nectar plants and larval host plants as there exist species specific relationships among the host and nectar plants and the dependant butterflies. Also there exist specific ecological and functional correlation among the mimetic forms (the models and mimics and the individual members of a mimicry-complex or Mullerian ring) found in any particular habitat. The present study is focussed on observation, documentation and analysis of mimetic butterflies commonly found at Taki, North 24 Parganas; availability and prominence of mimicking sets, their intra- and interfamily relationships, reporting about their larval host plants and nectar plants. The study also has an importance from conservation approach.
Źródło:
World Scientific News; 2016, 45, 2; 292-306
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Globalization’s Challenges in the 21st Century – Using the Iceberg Strategy, the Butterfly Effect and Multiple Intelligences to Create a New Learning Model
Wyzwania globalizacji w XXI w. – wykorzystanie strategii wierzchołka góry lodowej, efektu motyla i inteligencji wielorakiej w tworzeniu nowego modelu uczenia się
Autorzy:
Haller-Hayon, Orit
Powiązania:
https://bibliotekanauki.pl/articles/920483.pdf
Data publikacji:
2018-12-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
learning model
underwater knowledge
iceberg model
butterfly effect
multiple intelligences I
Opis:
Each student has their own individuality and special interests. One of the greatest challenges facing contemporary teachers is how to fascinate and link the students to the learning, to cause them to get excited and feel satisfaction. However, is it possible to attach different students with a diversity of abilities, dissimilar knowledge and different interests, to the same subject? Or is it a dream that cannot be fulfilled? The current article will introduce a new learning model, by using the ‘iceberg learning model’, understanding the influence of the ‘butterfly effect’ and the connection to the special ‘multiple intelligences’ of each student. Instead of seeing the subject of learning as a collection of facts, the concept of the iceberg sees the subject as a vast world full of information connected to endless forms related to the students’ areas of life. Therefore, the Iceberg learning method allows each student to be linked to the learning topic according to their own abilities, interests and desires; by using their unique strengths and utilizing their individual substantial intelligences.
Źródło:
Studia Edukacyjne; 2018, 51; 479-490
1233-6688
Pojawia się w:
Studia Edukacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Addition of Butterfly Pea Leaf Meal (Clitoria ternatea) in Feed on the Quality of Color of Swordtail Fish Head (Xiphophorus helleri)
Autorzy:
Rintan, Octaviana Julia
Yuli, Andriani
Lintang, P. S. Yuliadi
Iskandar, Iskandar
Powiązania:
https://bibliotekanauki.pl/articles/1076656.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Butterfly pea
Carotenoids
Clitoria ternatea
Color quality
Feed
Swordtail fish
Xiphophorus helleri
Opis:
The aim of this study was to determine the effect of butterfly pea leaf as a source of carotenoids on the quality of the color of the heads of swordtail fish. The study was conducted at the Aquaculture Laboratory, Building 4, Faculty of Fisheries and Marine Sciences, Padjadjaran University, from March to April 2019. The research method used an experimental approach with Completely Randomized Design (CRD) consisting of 4 treatments and 3 replications. Those treatments are 0%, 1%, 6% and 12% of butterfly pea leaf meal. The parameters observed included changes in head color quality, absolute weight growth, absolute length growth and water quality. Color observation data were analyzed using Kruskal-Wallis analysis if there were differences between treatments. Multiple comparisons were performed with the Z test with a confidence level of 95%. Data on the length of growth rates and absolute weights were analyzed using analysis of variance via the F test. Here, 95% was set as the confidence level. If there were differences between treatments, this was followed by Duncan test with a confidence level of 95%. The results showed that the addition of 6% butterfly pea leaf meal in commercial feed was able to improve the best color on the part of the swordtail fish head. This saw an average color score 9.56 and color value of 82.2. Addition of carotenoids in feed, however, did not significantly influence the growth of absolute weight or length and water quality.
Źródło:
World News of Natural Sciences; 2019, 26; 128-137
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of the impact of valve closure time on the course of water hammer
Autorzy:
Kodura, A.
Powiązania:
https://bibliotekanauki.pl/articles/240994.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
time of valve closure
butterfly valve
pressure characteristic
transient flow
water hammer
Opis:
The knowledge of transient flow in pressure pipelines is very important for the designing and describing of pressure networks. The water hammer is the most common example of transient flow in pressure pipelines. During this phenomenon, the transformation of kinetic energy into pressure energy causes significant changes in pressure, which can lead to serious problems in the management of pressure networks. The phenomenon is very complex, and a large number of different factors influence its course. In the case of a water hammer caused by valve closing, the characteristic of gate closure is one of the most important factors. However, this factor is rarely investigated. In this paper, the results of physical experiments with water hammer in steel and PE pipelines are described and analyzed. For each water hammer, characteristics of pressure change and valve closing were recorded. The measurements were compared with the results of calculations perfomed by common methods used by engineers – Michaud’s equation and Wood and Jones’s method. The comparison revealed very significant differences between the results of calculations and the results of experiments. In addition, it was shown that, the characteristic of butterfly valve closure has a significant influence on water hammer, which should be taken into account in analyzing this phenomenon. Comparison of the results of experiments with the results of calculations? may lead to new, improved calculation methods and to new methods to describe transient flow.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2016, 63, 1; 35-45
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the butterfly diversity of Haldia industrial belt and adjacent rural area in Purba Medinipur district, West Bengal, India
Autorzy:
Pahari, Priti Ranjan
Mishra, Niladri Prasad
Sahoo, Abhijit
Bhattacharya, Tanmay
Powiązania:
https://bibliotekanauki.pl/articles/1177940.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Butterfly diversity
dominance and similarity indices
ecological indicator
effect of industrialization
evenness
Opis:
67 species of butterflies under 5 families and 51 genera were recorded from Haldia industrial beltand adjacent rural area. Industrial zone hadfewer species low diversity and evenness indices and high dominance index. Nymphalidae outnumbered all other families in the industrial zone with 48% of the total species of that area. Such preponderance of any single family was not evident in the rural area, likewise industrial belt had 3 dominant species but no dominant species could be seen in the rural zone. Results suggest that industrialization could alter the butterfly diversity but it was not enough to make the two sites dissimilar as revealed by the index of similarity (0.52).
Źródło:
World Scientific News; 2018, 97; 207-224
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accelerometer profile of motion of the pelvic girdle in butterfly swimming
Autorzy:
Staniak, Z.
Buśko, K.
Górski, M.
Pastuszak, A.
Powiązania:
https://bibliotekanauki.pl/articles/306410.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pływanie
przyspieszenie
prędkość
swimming
butterfly swimming
acceleration
velocity
profile of pelvic girdle motion
Opis:
Purpose: The aim of the study was to develop a method to measure and analyse kinematics of movement of the pelvic girdle in butterfly swimming in order to support training of technical skills. Methods: A device for recording triaxial accelerations and triaxial rotational angular velocities was mounted on the dorsal part of the pelvic girdle of athlete. The measurements were performed in ten elite butterfly swimmers (age: 23.1 ± 3.7 years, body height: 187.6 ± 4.3 cm, body mass 83.4 ± 6.33 kg). The task of the athlete was to swim one length of short course pool at maximal intensity. Individual mean graphical and numerical profiles of the kinematics of the movement of the pelvic girdle was computed, within the average cycle based on five consecutive cycles. Results: Statistical analysis of numerical individual parameters of profiles of the athletes studied revealed statistically significant differences between the swimmers. Statistically significant correlations were also found between personal best times in 50 m swimming (r = –0.76, p < 0.05) and 100 m swimming (r = –0.76, p < 0.05) and duration of the part of the cycle connected with the decline in velocity from maximum translational motion velocity obtained during propulsion with the upper and lower limbs to minimum value of the velocity obtained before the beginning of propulsion only with the lower limbs. Conclusion: The proposed measurement method, presentation and analysis of the profile of the pelvic girdle motion in butterfly swimming represents a good tool for fast and effective qualitative and quantitative biomechanical evaluation of movement technique components.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 1; 159-167
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
19th-century real analysis, forward and backward
Autorzy:
Bair, Jacques
Blaszczyk, Piotr
Heinig, Peter
Kanovei, Vladimir
Katz, Mikhail
Powiązania:
https://bibliotekanauki.pl/articles/2012067.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
butterfly model
continuity
infinitesimals
\emph{limite}
standard part
variable quantity
Cauchy
de Prony
Opis:
19th-century real analysis received a major impetus from Cauchy's work. Cauchy mentions variable quantities, limits, and infinitesimals, but the meaning he attached to these terms is not identical to their modern meaning. Some Cauchy historians work in a conceptual scheme dominated by an assumption of a teleological nature of the evolution of real analysis toward a preordained outcome. Thus, Gilain and Siegmund-Schultze assume that references to limite in Cauchy's work necessarily imply that Cauchy was working with an Archimedean continuum, whereas infinitesimals were merely a convenient figure of speech, for which Cauchy had in mind a complete justification in terms of Archimedean limits. However, there is another formalization of Cauchy's procedures exploiting his limite, more consistent with Cauchy's ubiquitous use of infinitesimals, in terms of the standard part principle of modern infinitesimal analysis. We challenge a misconception according to which Cauchy was allegedly forced to teach infinitesimals at the Ecole Polytechnique. We show that the debate there concerned mainly the issue of rigor, a separate one from infinitesimals. A critique of Cauchy's approach by his contemporary de Prony sheds light on the meaning of rigor to Cauchy and his contemporaries. An attentive reading of Cauchy's work challenges received views on Cauchy's role in the history of analysis and indicates that he was a pioneer of infinitesimal techniques as much as a harbinger of the Epsilontik.
Dziewiętnastowieczna rzeczywista analiza otrzymała duży impuls w pracach Cauchy'ego. Cauchy posługuje się pojęciem zmiennej, granicy i nieskończenie małej, ale znaczenie, które wiąże z tymi terminami jest inne niż u jemu współczesnych autorów. Niektórzy historycy Cauchy'ego utrzymują schemat pojęciowy zdominowany przez założenie teleologicznej natury ewolucji rzeczywistej analizy w kierunku z góry ustalonej konstrukcji. Zatem Gilain i Siegmund-Schultze zakładają, że odniesienia do granicy (limite) w pracy Cauchy'ego niekoniecznie oznaczają, że Cauchy posługiwał się kontinuum Archimedesa, podczas gdy nieskończenie małe były jedynie wygodną figurą retoryczną, dla której Cauchy miał na myśli pełne uzasadnienie w kategoriach granic Archimedesa. Istnieje jednak inna formalizacja procedur Cauchy'ego wykorzystujących jego granice(limite), bardziej spójna z wszechobecnym użyciem nieskończenie małych Cauchy'ego, w kategoriach standardowej części zasady nowoczesnej analizy nieskończenie małej. Podważamy błędne przekonanie, zgodnie z którym Cauchy został rzekomo zmuszony do nauczania nieskończenie małych w Ecole Polytechnique. Pokazujemy, że debata dotyczyła głównie kwestii ścisłości, oddzielnego od nieskończenie małych. Krytyka podejścia Cauchy'ego przez jego współczesnego de Prony rzuca światło na znaczenie ścisłości dla Cauchy'ego i jego współczesnych. Uważna lektura wyzwań Cauchy'ego spotkała się z poglądem na rolę Cauchy'ego w historii analizy i wskazuje, że był on pionierem nieskończenie małych technik, podobnie jak zapowiedzią Epsilontiki.
Źródło:
Antiquitates Mathematicae; 2019, 13; 19-49
1898-5203
2353-8813
Pojawia się w:
Antiquitates Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł

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