Wyniki wyszukiwania - Biblioteka Nauki

1

Effect of Transverse Acoustic Flow on the Input Impedance of Rapidly Flaring Horns

100%

Nederveen C. J.

Archives of Acoustics

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2011

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tom Vol. 36, No. 3

533-544

EN

In slowly flaring horns the wave fronts can be considered approximately plane and the input impedance can be calculated with the transmission line method (short cones in series). In a rapidly flaring horn the kinetic energy of transverse flow adds to the local inertance, resulting in an effective increase in length when it is located in a pressure node. For low frequencies corrections are available. These fail at higher frequencies when cross-dimensions become comparable to the wavelength, causing resonances in the cross-direction. To investigate this, the pipe radiating in outer space is modelled with a finite difference method. The outer boundaries must be fully absorbing as the walls of an anechoic chamber. To achieve this, Berenger’s perfectly matched layer technique is applied. Results are presented for conical horns, they are compared with earlier published investigations on flanges. The input impedance changes when the largest cross-dimension (outer diameter of flange or diameter of the horn end) becomes comparable to half a wavelength. This effect shifts the position of higher modes in the pipe, influencing the conditions for mode locking, important for ease of playing, dynamic range and sound quality.

2

Heavy metal concentration in coat hair and hoof horn in stabled and reserve Polish Konik horses

75%

Stachurska A. , Walkuska G. , Chalabis-Mazurek A. , Jaworski Z. , Cebera M.

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nr 3

EN

The objective of the study was to determine if there were differences in Cr, Mn, Cu, Cd, Pb and Ni levels in coat hair and hoof horn between Polish Konik horses maintained in stabled and reserve systems in Roztocze National Park in Poland. Summer and winter feeding seasons (seasons of the year in case of hooves) and age of horses were taken into account. 107 samples of hair and hooves, as well as all kinds of feed and sources of water available for the horses were examined. The results of the study indicate that the concentration of the elements in the coat hair, hoof horn, feeds and water is usually too low to show possible influence of the system of maintenance in feeding seasons and age effect. The reserve horses are not more exposed to heavy metal contamination than the stabled horses. In the hair, solely Mn level is affected by the systems of maintenance in summer and winter feeding seasons: during winter it is higher, particularly in the stabled system, than during summer. In hooves, Cr concentration is higher in stabled horses than in reserve horses and conversely, Cu content is higher in the reserve horses. Mn content is age-affected both in hair and hooves, likewise is Cu content in the hooves. The results indicate a necessity of Cu compound supplementation in feeding the horses in both systems of maintenance.

3

Instrumenty muzyczne w Księdze Amosa

71%

Kubies G.

The Biblical Annals

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2015

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tom 5

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nr 1

81-94

EN

References to music are common elements of prophetic literature, especially in the Books of the Major Prophets (Isaiah, Jeremiah and Ezekiel), indirectly indicating writers’ interests in that form of art. There are five musical terms mentioned in the Book of Amos: šôpär - horn (Am 2,2; 3,6), qînäh - lamentation, dirge (Am 5,1; 8,10), nëbel - probably lyre (Am 5,23; 6,5), šîr - song (Am 5,23; 6,5; 8,3.10) and Külê-šîr - instruments of song, string instruments (Am 6,5). The purpose of the article is to interpret the musical motifs excluding two related to singing in the biblical and archeomusicological contexts. Am 5,23 and 6,5 can be linked with real musical performance practices in sacred and secular environments in ancient Israel/Palestine. Am 2,2 confirms how important part in the Near East played signal aerophones, whereas Am 3,6 reflects characteristic aspects of Amos’s vocational narrative. The figure of Kind David in Am 6,5 is analyzed in the context of the origin of musical instruments. The comparative materials for Am 2,2; 3,6; 5,23 and 6,5 are mainly the prophetic Books.

PL

References to music are common elements of prophetic literature, especiallyin the Books of the Major Prophets (Isaiah, Jeremiah and Ezekiel), indirectly indicating writers’ interests in that form of art. There are five musical terms mentioned in the Book of Amos: šôpär - horn (Am 2,2; 3,6), qînäh - lamentation, dirge (Am 5,1; 8,10), nëbel - probably lyre (Am 5,23; 6,5), šîr - song (Am 5,23; 6,5; 8,3.10) and Külê-šîr - instruments of song, string instruments (Am 6,5). The purpose of the article is to interpret the musical motifs excluding two related to singing in the biblical and archeomusicological contexts. Am 5,23 and 6,5 can be linked with real musical performance practices in sacred and secular environments in ancient Israel/Palestine. Am 2,2 confirms how important part in the Near East played signal aerophones, whereas Am 3,6 reflects characteristic aspects of Amos’s vocational narrative. The figure of Kind David in Am 6,5 is analyzed in the context of the origin of musical instruments. The comparative materials for Am 2,2; 3,6; 5,23 and 6,5 are mainly the prophetic Books.

4

Sources of the autonomic and afferent fibers to the horns and body of the uterus in pig

63%

Flieger S. , Boratynski Z. , Welento J. , Krzyzanowski J. , Slawomirski J.

Folia Morphologica

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1988

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tom 47

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nr 1-4

5

Analiza wpływu umieszczenia klaksonów samochodowych w pojeździe na rejestrowany poziom dźwięku

63%

Gałęzia A. , Mączak A.

Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska

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2010

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tom z. 5/81

39-52

PL

Projekt MID-MOD, realizowany w ramach 7 Programu Ramowego, ma na celu opracowanie i weryfikację nowoczesnych metod numerycznych modelujących zjawiska akustyczne w pojazdach. Jednym z zadań zdefiniowanych przez jednego z partnerów przemysłowych jest określenie wpływu umieszczenia ostrzegawczych sygnalizatorów dźwiękowych w przedziale silnikowym pojazdu na rejestrowany poziom dźwięku. Jest to ważny problem związany z badaniami legalizacyjnymi pojazdu.

EN

MID-MOD project, coverage in framework of FP7 project, is focused on development and verification of up-to-date numerical methods modeling acoustic effects in cars. One of tasks, defined in framework of MID-MOD by one of industrial partners, is analysis of influence of horn localization in engine compartment on signal level. It is important problem in context of legalization procedure of a car.

6

Sexual dimorphism in size of the skull of Spanish ibex Capra pyrenaica

63%

Fandos P. , Vigal C. R.

Acta Theriologica

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1993

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tom 38

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nr 1

EN

Sexual dimorphism in the skull of Spanish ibex Capra pyrenaica Schinz, 1838 is analyzed by means of univariate and multivariate techniques in one of the most representative populations of the species, located in the Sierra de Gredos, central Spain. Thirty eight measurements were used for the analysis: 30 of the skull and mandible, and 8 of the horn. Eighty three skulls (40 males and 43 females) of individuals older than 4 years were used. In 36 out of the 38 variables males were significantly larger than females. Horn characters showed the highest variability and also the most significant differences between sexes. Values of Mahalanobis distance between males and females were high (D2 = 323.1). When Factor Analysis is performed with the whole set of 38 variables, 7 Principal Factors were extracted, scores of Principal Factor 2 (related with horn variables) and Principal Factor 3 {related to molar toothrow length) showing significant differences between sexes. In this analysis, horn characters (Principal Factor 2) accumulate the sexual dimorphism of other skull traits. However, if the same analysis is performed without horn characters, 5 Principal Factors were extracted, scores of three Principal Factors showing significant differences between sexes. Highest sexual dimorphism in this analysis corresponds to the Principal Factor 3 (molar toothrow), follow the Principal Factor 2 (posterior region of the skull) and Principal Factor 1 (main length measurements). This suggest that the high degree of sexual dimorphism observed in the Spanish ibex skull is mainly related to horn traits and, to a lesser extent, of other skull features like molar toothrow length.

7

The use of positioners in creation modular models of horns for mammals from the Bovidae family

51%

Stępień C. , Prolejko M.

Mathematica Applicanda

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2014

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tom Vol. 42, No. 2

179--192

EN

The paper describes the method suitable for creating animated modular models of horns for mammals belonging to the Bovidae family. This method uses the time-dependent positioners. They are used in two ways: for placing modules appropriately to each other and for creating lateral surfaces of the modules. Thanks to double usage of the positioners, a continuous surface is achieved regardless of the complexity of the time-dependent parameters. There are considered different connections between parameters of modules, justified from the point of view of modeling the horns. The method is illustrated with the example of creation a time-dependent ram's horn model.

PL

W pracy opisano metodę tworzenia animowanych modułowych modeli rogów ssaków z rodziny krętorogich, w której wykorzystano pojęcie pozycjonerów. W metodzie wykorzystuje się zależne od czasu pozycjonery na dwa sposoby: do ustawiania modułów względem siebie oraz do tworzenia powierzchni bocznej modułu. Dzięki podwójnemu wykorzystaniu pozycjonerów uzyskujemy ciągłość powierzchni bocznej bryły złożonej, bez względu na stopień skomplikowania parametrów zależnych od czasu. Rozważa się różne powiązania parametrów poszczególnych modułów, uzasadnione z punktu widzenia modelowania rogów. Metodę zilustrowano przykładem tworzenia modelu rogu baraniego.

8

Socio-ethogram of adult males versus biochemical-genetic variation in assessing phylogenetic relationships of the Caprinae

51%

Kurt F. , Hartl G. B.

Acta Theriologica. Supplement

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1995

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nr 03

EN

To investigate phylogenetic relationships among 9 genera of the Caprinae (Capra, Ammotragus, Hemitragus, Pseudois, Ovis, Rupicapra, Oreamnos, Nemorhaedus, Capri- cornis) behaviours involved in courtship and mating, aggression, threat, dominance, submission, and marking of adult males were subjected to phylogenetic analysis. Based on all 32 characters and 96 character states investigated, phylogenetic patterns generally were in good agreement with biochemical-genetic data avaliable. Discordance between phylogenetic trees constructed from behavioural and from biochemical-genetic traits as to the position of Ammotragus turned out to be associated with ethological functional categories. Behaviours involved in courtship and mating were identified as the most reliable ones for phylogenetic studies. Courtship displays function as isolation mechanisms among closely related taxa. This is of paramount importance in those forms where secondary sexual characters such as horns are poorly differentiated while in highly evolved taxa size and shape of horns may also trigger readiness for mating in estrous females.

9

Nowoczesne metody sterowania generatorami ultradźwiękowymi

44%

Kardyś W. , Milewski A. , Kogut P. , Kluk P.

Elektronika : konstrukcje, technologie, zastosowania

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2016

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tom Vol. 57, nr 6

47--50

PL

W artykule przedstawiono dostępne metody sterowania falownikiem rezonansowym w generatorach ultradźwiękowych. Skupiono się na najnowszych metodach sterowania o wysokiej rozdzielczości regulacji. Zaprezentowano metodę wytwarzania sygnałów sterujących falownikiem rezonansowym z wykorzystaniem mikrokontrolera STM32F334 oraz wyniki badań porównawczych różnych rozwiązań układów generacji przebiegów sterujących.

EN

The article presents available methods of resonant converter control in ultrasonic generators. New methods of control with high resolution of frequency regulation have been presented. Method of generation of resonant converter control signals with STM32F334 microcontroller have been shown as well as measurement results of various generation circuits.