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This article deals with kinematic and kinetic conditions in volleyball attack and identifies loads in the shoulder joint. Joint angles and velocities of individual segments of upper limb were measured with the use of the motion capture system XSENS. Muscle forces and loads in skeletal system were calculated by means of mathematical model elaborated in AnyBody system. Spikes performed by players in the best and worst way were compared with each other. The relationships were found between reactions in shoulder joint and flexion/extension, abduction/adduction and rotation angles in the same joint and flexion/extension in the elbow joint. Reactions in shoulder joint varied from 591 N to 2001 N (in relation to body weight [BW] 83–328%).
The analysis proved that hand velocity at the moment of the ball hit (which varied between 6.8 and 13.3 m s–1) influences on the value of reaction in joints, but positions of individual segments relative to each other are also crucial. It was also proved in objective way, that position of the upper limb during spike can be more or less harmful assuming that bigger reaction increases possibility of injury, what can be an indication for trainers and physiotherapists how to improve injury prevention. 相似文献
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Maciej Karwowski Jacek Gralewski Izabela Lebuda Ewa Wi niewska 《Thinking Skills and Creativity》2007,2(1):57-61
The article presents basic information on the strand of psycho-pedagogy of creativity—a unique perspective on creativity teachers’ education in Europe and the world. Psycho-pedagogy of creativity is a major in pedagogy studies, run in Poland, at the Warsaw Academy of Special Education. Our aim is to educate specialists who are open, sensitive and well prepared content-wise in identifying and developing children's and youth's creative potential. We also aim at introducing the studies that function in a wider social context, and presenting the situation of Poland after systemic transformation. It seems that information of this type may prove interesting to researchers and practitioners that deal with education of creativity. 相似文献
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Agnieszka Chamera-Nowak Jacek Puchalski 《Slavic & East European Information Resources》2017,18(3-4):231-241
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ABSTRACTConservation of an oil painting on a zinc support is a complex challenge that has not been covered in the literature. Oil paint and zinc support rarely form a working combination because of their chemical properties. This article discusses the conservation of an oil painting on a zinc support that was found in extremely bad condition due to harsh environmental conditions it had been exposed to. The object had to be consolidated due to flaking paint and cleaned of surface dirt and support corrosion products. Finally, the object had to be physically strengthened due to the weakness of the support. This process required conservators to combine methods from several different fields of the conservation discipline. Methods employed in the conservation process came less from the literature, due to the lack thereof, and more from the everyday experience of the department and vernacular working practices. The overall methodology of the process has been reconstructed and critically evaluated in the broader field of conservation ethics and the discipline as a whole. 相似文献
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This paper deals with the problem of finding graphs (directed and undirected) maximizing the number of spanning trees among the regular graphs with the same number of nodes and edges. The approach is based on heuristic algorithms such as k-optimal and evolutionary. The emphasis is rather on checking whether these techniques are applicable to solving extremal graph problems than investigating generic structures of optimal graphs. For this reason circulant graphs, for which computationally effective tree counting formulas exist, are discussed first and then the results extended to cover the class of regular graphs. 相似文献
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Michael Wood Adam Garbicz Jacek Klinowski Tino Balio Charles Higham John Douglas Eames 《Communication Booknotes Quarterly》2013,44(4):40-41
Michael Wood's America in the Movies, or "Santa Maria, It Had Slipped My Mind" (New York: Basic Books, 1975---$10.00) Adam Garbicz and Jacek Klinowski's Cinema, The Magic Vehicle: A Guide to its Achievement (Metuchen, N.J.: Scarecrow Press, 1975---$18.50) Tino Balio's United Artists: The Company Built by the Stars (Madison: University of Wisconsin Press, 1975-- $15.00) Charles Higham's Warner Brothers (New Y( Scribner's, 1975---$9.95) John Douglas Eames' The MGM Story: The Complete History of Fifty Roaring Years (New York: Crown, 1975---$25.00) Rochelle Larkin's Hail, Columbia (New Rochelle, N.Y.: Arlington House, 1975---$17.95) Datid E. Scherman (ed.) Life Goes to the Movies (New York: Time-Life Books, 1975-- $19.95) Paul Trent's Those Fabulous Movie Years: The 30s (New York: Crown, 1975---$14.95) Griffith and Mayer's The Movies (New York: Simon and Schuster, 1969) Sidney Skolsky's Don't Get Me Wrong-- I Love Hollywood (New York: Putnam's, 1975---$8.95) Leo Handel's Hollywood Looks at its Audience: A Report of Film Audience Research (originally issued by the University of Illinois Press in 1950) 相似文献
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Xiang Hu Dominika Sobotka Krzysztof Czerwionka Qi Zhou Li Xie Jacek Makinia 《Journal of Zhejiang University. Science. B》2018,19(4):305-316
The effects of two different external carbon sources (acetate and ethanol) and electron acceptors (dissolved oxygen, nitrate, and nitrite) were investigated under aerobic and anoxic conditions with non-acclimated process biomass from a full-scale biological nutrient removal-activated sludge system. When acetate was added as an external carbon source, phosphate release was observed even in the presence of electron acceptors. The release rates were 1.7, 7.8, and 3.5 mg P/(g MLVSS·h) (MLVSS: mixed liquor volatile suspended solids), respectively, for dissolved oxygen, nitrate, and nitrite. In the case of ethanol, no phosphate release was observed in the presence of electron acceptors. Results of the experiments with nitrite showed that approximately 25 mg NO2-N/L of nitrite inhibited anoxic phosphorus uptake regardless of the concentration of the tested external carbon sources. Furthermore, higher denitrification rates were obtained with acetate (1.4 and 0.8 mg N/(g MLVSS·h)) compared to ethanol (1.1 and 0.7 mg N/(g MLVSS·h)) for both anoxic electron acceptors (nitrate and nitrite). 相似文献
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Radosław Wieczór Anna Maria Wieczór Grażyna Gadomska Katarzyna Stankowska Jacek Fabisiak Karol Suppan Grzegorz Pulkowski Jacek Budzyński Danuta Rość 《Journal of Zhejiang University. Science. B》2016,17(11):842-849
Objective
Being overweight or obese comprises a significant risk factor for atherosclerosis. Fat tissue also generates factors stimulating angiogenesis, the process by which new blood vessels form. The purpose of this paper is to assess concentrations of the vascular endothelial growth factor A (VEGF-A) and its soluble type-1 and type-2 receptors (sVEGFR-1 and sVEGFR-2) in plasma of patients with peripheral arterial disease (PAD) depending on the level of nutrition according to body mass index (BMI).Methods
The study group included patients suffering from symptomatic PAD (n=46) in Fontaine classes IIa–IV without any history of neoplastic disease and who have a normal BMI (n=15), are overweight (n=21) or are obese (n=10). The control group (n=30) consisted of healthy non-smoking volunteers who were neither overweight nor obese. Venous blood plasma samples were collected from both groups at rest in the morning to determine plasma concentrations of VEGF-A, sVEGFR-1, and sVEGFR-2 using the enzymelinked immunosorbent assay (ELISA) method.Results
The group of patients with PAD co-existent with being overweight or obese tended to have higher mean concentration levels of VEGF-A and sVEGFR-2 when compared with patients suffering from PAD with normal BMI. A statistically significant positive correlation was obtained between BMI and average plasma concentrations of sVEGFR-2 (R=0.37, P=0.0103). However, no significant correlation was noticed between BMI and VEGF-A or sVEGFR-1 concentrations.Conclusions
A positive correlation determined between the level of antiangiogenic factor and BMI value may be indicative of the linearly growing prevalence of some antiangiogenic factors in patients with metabolic disorders, which may be one of numerous factors contributing to incomplete efficiency of collateral circulation development in patients with PAD.10.
Jacek Wojciechowski 《Journal of The Franklin Institute》1984,318(4):215-231
The method of tree generation of a graph decomposed into any number of parts is described in this paper. The decomposition of a graph is defined. The formula for the generation of trees of a decomposed graph is given in Theorem I. The necessary and sufficient conditions which a graph decomposition must satisfy to avoid duplications in the generated set of trees are discussed and results are summarized in Theorems II and III. A criterion for existence of such a decomposition is formulated in Theorem IV and also an appropriate algorithm for the graph decomposition is suggested. 相似文献