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Wyświetlanie 1-15 z 36
Tytuł:
Isometric extensions, 2-cocycles and ergodicity of skew products
Autorzy:
Danilenko, Alexandre I.
Lemańczyk, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/1216196.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
ergodic transformation
cocycle
isometric extension
Opis:
We establish existence and uniqueness of a canonical form for isometric extensions of an ergodic non-singular transformation T. This is applied to describe the structure of commutors of the isometric extensions. Moreover, for a compact group G, we construct a G-valued T-cocycle α which generates the ergodic skew product extension $T_α$ and admits a prescribed subgroup in the centralizer of $T_α$.
Źródło:
Studia Mathematica; 1999, 137, 2; 123-142
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the invertibility of isometric semigroup representations
Autorzy:
Batty, C. J. K.
Greenfield, D.
Powiązania:
https://bibliotekanauki.pl/articles/1290204.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
semigroup
isometric representation
spectrum
polynomial convexity
Opis:
Let T be a representation of a suitable abelian semigroup S by isometries on a Banach space. We study the spectral conditions which will imply that T(s) is invertible for each s in S. On the way we analyse the relationship between the spectrum of T, Sp(T,S), and its unitary spectrum $Sp_{u}(T,S)$. For $S = ℤ^{n}_{+}$ or $ℝ^{n}_{+}$, we establish connections with polynomial convexity.
Źródło:
Studia Mathematica; 1994, 110, 3; 235-250
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Isometric Path Partition Problem
Autorzy:
Manuel, Paul
Powiązania:
https://bibliotekanauki.pl/articles/32323579.pdf
Data publikacji:
2021-11-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
path cover problem
isometric path partition problem
isometric path cover problem
multi-dimensional grids
cylinder
torus
Opis:
The isometric path cover (partition) problem of a graph consists of finding a minimum set of isometric paths which cover (partition) the vertex set of the graph. The isometric path cover (partition) number of a graph is the cardinality of a minimum isometric path cover (partition). We prove that the isometric path partition problem and the isometric k-path partition problem for k 3 are NP-complete on general graphs. Fisher and Fitzpatrick in [The isometric number of a graph, J. Combin. Math. Combin. Comput. 38 (2001) 97–110] have shown that the isometric path cover number of the (r × r)-dimensional grid is ⌈2r/3 ⌉. We show that the isometric path cover (partition) number of the (r × s)-dimensional grid is s when r s(s − 1). We establish that the isometric path cover (partition) number of the (r × r)-dimensional torus is r when r is even and is either r or r + 1 when r is odd. Then, we demonstrate that the isometric path cover (partition) number of an r-dimensional Benes network is 2r. In addition, we provide partial solutions for the isometric path cover (partition) problems for cylinder and multi-dimensional grids. We apply two di erent techniques to achieve these results.
Źródło:
Discussiones Mathematicae Graph Theory; 2021, 41, 4; 1077-1089
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new hand dynamometer activforce isometric muscle activation on single joint muscle force of volleyball players
Autorzy:
Kahraman, Yeliz
Powiązania:
https://bibliotekanauki.pl/articles/34671012.pdf
Data publikacji:
2024-02-23
Wydawca:
Akademia Tarnowska
Tematy:
isometric force
peak
average
volleyball players
Opis:
Isometric muscle activation of single joint to volleyball players is critic on sport performance to produce potential muscle force, however isometric measurement limited in isokinetic muscle activity measurement of volleyball players. Indeed, hand dynamometers commonly use in various body isometric force. Professional volleyball players age 16.23 ± 0.59 yr, body mass 60.22 ± 4.64 kg, hight 1.69 ± 0.04 m participated to peak and average isometric force measurement over 8 week pre and post test. Accordingly, single joint muscle force production measurement of volleyball players tested on isometric muscle activation using a new hand dynamometer activforce 2. Isometric muscle activation tests consisted of 24 body region from upper and lower compartment. For this isometric muscle action test detected on peak force outcomes (SEM: 37.90; CV: 1.79) and average force outcomes (SEM: 33.62; CV: 1.84). The high isometric muscle action joint loading performing mechanical test application recommended on athletic population to using isometric potential high contraction model by strength training performance separately in-season and off-season measurement modeling. Conclusion, peak and average force production progressive isometric modeling of volleyball athletes worked to current sport–health condition. As out, conclusion must be advanced isometric force measurement proper work in sport-specific tasks. The proper isometric force must be repeat sport performance outcome in different sport modalities.
Źródło:
Health Promotion & Physical Activity; 2023, 25, 4; 22-30
2544-9117
Pojawia się w:
Health Promotion & Physical Activity
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of a 10-week step aerobics training on vo 2 max, isometric strength and body composition of young women
Autorzy:
Drobnik-Kozakiewicz, Izabela
Sawczyn, Michał
Zarębska, Aleksandra
Kwitniewska, Anna
Szumilewicz, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1054679.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
VO2 max
body composition
isometric strength
step aerobics
Opis:
Health status is partly determined by physical fitness level. Physical fitness can be developed through different physical activities under condition that regularity and intensity are maintained on optimal level. One of such physical activities is step aerobics - one of the most popular collective fitness forms offered in fitness clubs. The objective of this study was to evaluate the influence of step aerobics training on VO2max, isometric strength and body composition of young female students. Female students aged 19-21 of University of Physical Education and Sport in Gdańsk were subjects in this study. VO2max, isometric strength of elbow flexors and knee extensors, as well as body composition, were measured week before and week after a ten-week step aerobics training. For statistical analysis, basic descriptive statistics and student’s t-test were applied for dependent variables. After ten weeks of training there were no statistically significant changes in body composition, probably due to lack of calorie intake control. Significant changes were observed in isometric strength of elbow flexors but no changes in isometric strength of knee extensors. There was a compensation in isometric strength noted between left and right leg after ten weeks of training, where left leg was weaker than the right leg before training. Significant changes were noted in VO2max values, which increased from 42.04 ml/kg/min-1 to 45.71 ml/kg/min-1. Step aerobics training can sufficiently increase VO2max in young females and has a potential in developing strength of upper extremities. When body composition is the main purpose, diet should be taken under consideration.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2013, 4, 4; 3-9
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Force Steadiness during Submaximal Isometric Plantar and Dorsiflexion in Resistance Training: Experienced vs Non-experienced Individuals
Autorzy:
Salonikidis, Konstantinos
Papageorgiou, Konstantinos
Meliadis, Anastasios
Arabatzi, Fotini
Powiązania:
https://bibliotekanauki.pl/articles/1627268.pdf
Data publikacji:
2021-09-10
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
stability
isometric torque
plantar flexor
dorsi flexor
ankle joint
Opis:
The purpose of this study was to determine differences in force steadiness during submaximal plantar flexion (PF) and dorsiflexion (DF) of the dominant leg between individuals experienced and not experienced in resistance training. Forty males aged 18-32 were divided in two groups based on their experience in resistance training (experienced – not experienced). Evaluation of maximal voluntary isometric force was carried out on a Humac-Norm isokinetic dynamometer. The measurement of the maximal voluntary contraction (MVC) was measured in 3 isometric attempts. Then, the stability measurement of 10%, 30%, 50% and 70% of the MVC was assessed. The duration of the isometric contraction was 10 seconds but only 6 seconds were analyzed. T-test for independent samples and ANOVA was applied for the statistical analysis. The results showed that the individuals with more experience in resistance training presented a significantly higher MVC and force steadiness of the plantar and dorsiflexors muscles, compared with the individuals with less experience (p < 0.05). In conclusion, the years of practice with resistance training appear to have a beneficial effect on force steadiness.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2021, 34, 2; 5-13
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The strong isometric dimension of finite reflexive graphs
Autorzy:
Fitzpatrick, Shannon
Nowakowski, Richard
Powiązania:
https://bibliotekanauki.pl/articles/743675.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
isometric
embedding
strong product
injective hull
paths
distance
metric
Opis:
The strong isometric dimension of a reflexive graph is related to its injective hull: both deal with embedding reflexive graphs in the strong product of paths. We give several upper and lower bounds for the strong isometric dimension of general graphs; the exact strong isometric dimension for cycles and hypercubes; and the isometric dimension for trees is found to within a factor of two.
Źródło:
Discussiones Mathematicae Graph Theory; 2000, 20, 1; 23-38
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isometric immersions of the hyperbolic space $H^n(-1)$ into $H^{n+1}(-1)$
Autorzy:
Hu, Ze-Jun
Powiązania:
https://bibliotekanauki.pl/articles/1396048.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
isometric immersion
Monge-Ampère type equation
hyperbolic space
Opis:
We transform the problem of determining isometric immersions from $H^n(-1)$ into $H^{n+1}(-1)$ into that of solving equations of degenerate Monge-Ampère type on the unit ball $B^n(1)$. By presenting one family of special solutions to the equations, we obtain a great many noncongruent examples of such isometric immersions with or without umbilic set.
Źródło:
Colloquium Mathematicum; 1999, 79, 1; 17-23
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spacetimes embedded into E6
Autorzy:
Montiel-Pérez, J. Yaljá
Caltenco, J. H.
Linares y M., R.
López-Bonilla, J.
Powiązania:
https://bibliotekanauki.pl/articles/1164540.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
E6
Embedding of Riemannian 4-spaces
Local and isometric embedding
Opis:
We study the local and isometric embedding of Riemannian spacetimes into the pseudo-Euclidean flat E6. Our main purpose is to pinpoint the known results with the corresponding references, and to indicate the main routes and connections from here to the still open problems in the field. Some new results are also included in order to round off our discussion.
Źródło:
World Scientific News; 2018, 107; 31-45
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Weakly convex and convex domination numbers
Autorzy:
Lemańska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2050775.pdf
Data publikacji:
2004
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
dominating set
connected domination number
distance
isometric set
convex set
Opis:
Two new domination parameters for a connected graph G: the weakly convex domination number of G and the convex domination number of G are introduced. Relations between these parameters and the other domination parameters are derived. In particular, we study for which cubic graphs the convex domination number equals the connected domination number.
Źródło:
Opuscula Mathematica; 2004, 24, 2; 181-188
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Core Strength as a Paramount Contributor for Potential Upper Limb Isometric Strength - A Correlational Study
Autorzy:
Kaur, Harsirjan
Chaudhary, Sarika
Chhabra, Charu
Powiązania:
https://bibliotekanauki.pl/articles/11542036.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
core strength
female athletes
push-up
pull-down
isometric strength
Opis:
It is believed that a strong core will enable an athlete to effectively transfer forces from the lower extremities through the torso to the upper extremities. Control of the shoulder girdle force is important for the proper function of the upper extremities, although stabilising forces from the trunk and pelvis are also important. The purpose of this study is to determine the association between shoulder isometric push-up/pull-down strength and isometric strength of the abdominal muscles. Using the HUR Rehab-Line 5310 and 5120, isometric upper limb and core strength was measured. The statistical analysis revealed a moderate but significant positive association between the strength of the back muscles and isometric push-ups. Additionally, there was a weak and significant connection between isometric push-ups and abdominal strength. The study therefore draws the conclusion that there is a link between isometric upper limb performance and core musculature strength/stability. The abdominal and back muscles' isometric strength is closely tied to the isometric push-up, which is attributable to the contraction of the Pectoralis Major, Deltoid, and Triceps Brachii. The only muscle group identified to have a substantial and positive correlation with isometric pull-down strength is the abdominal muscles.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2023, 42; 45-53
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymptotically hilbertian modular Banach spaces: examples of uncountable categoricity
Autorzy:
Henson, C. Ward
Raynaud, Yves
Powiązania:
https://bibliotekanauki.pl/articles/746222.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Banach spaces
ultrapowers
elementary equivalence
isometric embeddings
modular direct sums
Opis:
We give a criterion ensuring that the elementary class of a modular Banach space \(E\) (that is, the class of Banach spaces, some ultrapower of which is linearly isometric to an ultrapower of \(E\)) consists of all direct sums \(E\oplus_m H\), where \(H\) is an arbitrary Hilbert space and \(\oplus_m\) denotes the modular direct sum. Also, we give several families of examples in the class of Nakano direct sums of finite dimensional normed spaces that satisfy this criterion. This yields many new examples of uncountably categorical Banach spaces, in the model theory of Banach space structures.
Źródło:
Commentationes Mathematicae; 2016, 56, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Median and quasi-median direct products of graphs
Autorzy:
Brešar, Boštjan
Jha, Pranava
Klavžar, Sandi
Zmazek, Blaž
Powiązania:
https://bibliotekanauki.pl/articles/744332.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
median graph
direct product
quasi-median graph
isometric embeddings
convexity
Opis:
Median graphs are characterized among direct products of graphs on at least three vertices. Beside some trivial cases, it is shown that one component of G×P₃ is median if and only if G is a tree in that the distance between any two vertices of degree at least 3 is even. In addition, some partial results considering median graphs of the form G×K₂ are proved, and it is shown that the only nonbipartite quasi-median direct product is K₃×K₃.
Źródło:
Discussiones Mathematicae Graph Theory; 2005, 25, 1-2; 183-196
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Próba oceny elektrostymulacji prądami Kotza oraz ćwiczeń izometrycznych
The attempt of assessment of Kotz electrical stimulation and isometric exercises
Autorzy:
Bidzińska, Gabriela
Cynarska, Aleksandra
Marczyński, Daniel
Ptaszkowski, Kuba
Dymarek, Robert
Powiązania:
https://bibliotekanauki.pl/articles/526760.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
prądy Kotza
ćwiczenia izometryczne
elektromiografia powierzchniowa
Kotz stimulation
isometric exercises
surface elektromyography
Opis:
Wstęp: Elektrostymulacja prądami Kotza jest jednym z zabiegów stosowanych w fizjoterapii zarówno do zwiększania masy mięśniowej, jak i wytrzymałości mięśni. Innym sposobem wykorzystywanym w tym samym celu, jest wykonywanie ćwiczeń izometrycznych. Cel pracy: Celem badań było określenie, która z metod: elektrostymulacja Kotza czy ćwiczenia izometryczne, korzystniej wpływa na napięcie oraz przyrost masy mięśnia prostego uda u osób zdrowych. Materiał i metody: W badaniu wzięło udział 30 osób. Grupa A (n=15) poddana była serii 10 zabiegów prądami Kotza, w grupie B (n=15) zastosowano ćwiczenia izometryczne. Wykonano pomiar obwodów badanej kończyny, próbę wysiłkową w formie „testu krzesełkowego” oraz ocenę napięcia mięśnia prostego uda za pomocą elektromiografii powierzchniowej. Wyniki: W obu grupach odnotowano istotny statystycznie spadek napięcia spoczynkowego oraz wydłużenie próby wysiłkowej. Nie zaobserwowano istotnych statystycznie zmian obwodów uda. Wnioski: Niniejsza praca pozwala potwierdzić słuszność stosowania prądów Kotza i ćwiczeń izometrycznych u osób zdrowych.
Introduction: Kotz electrostimulation is one of the treatments used in Physical therapy, both to enhance muscle mass and muscle strength. Another method used for the same purpose is to perform isometric exercises. The two treatments can also be used to change the bioelectrical activity of the muscle. Aim of research:The aim of this study was to determine which of the methods: Kotz electrostimulation or isometric exercises, has a better influence on the tension and weight gain of rectus femoris in healthy subjects. Material and methods: 30 individuals participated in the study. Group A (n=15) was subjected to a series of 10 Kotz stimulations, group B (n=15) to isometric exercises. Thigh girth, Strength test in the form of a „chair test” and rectus femoris muscle tension was assessed. Results: In both groups statistically significant decrease in muscle tension and the extension of the strength test was reported. There were no statistical significant changes in thigh girth. Conclusions: This research allows to confirm the validity of the use of Kotz stimulations and isometric exercises in healthy subjects.
Źródło:
Puls Uczelni; 2013, 2; 9-13
2080-2021
Pojawia się w:
Puls Uczelni
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of two variables Toeplitz type operators
Autorzy:
Król-Klimkowska, Elżbieta
Ptak, Marek
Powiązania:
https://bibliotekanauki.pl/articles/744673.pdf
Data publikacji:
2016-12-01
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
Pair of contractions
isometric dilation
doubly commuting
Toeplitz operator
symbol operator
Opis:
The investigation of properties of generalized Toeplitz operators with respect to the pairs of doubly commuting contractions (the abstract analogue of classical two variable Toeplitz operators) is proceeded. We especially concentrate on the condition of existence such a non-zero operator. There are also presented conditions of analyticity of such an operator.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica; 2016, 15
2300-133X
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 36

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