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Wyświetlanie 1-15 z 51
Tytuł:
A movable string sieve - analysis of seed screening
Autorzy:
Kaliniewicz, Z.
Domański, J.
Powiązania:
https://bibliotekanauki.pl/articles/298132.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
string sieve
modeling
physical properties
Opis:
The conditions of seed movement in a string sieve set into reciprocating motion have been formulated for cereal, vetch, pea, lupine and faba bean seeds. In the analyzed string sieve, seed movement was determined by a combination of the following parameters: angular velocity of the crank, crank radius, seed size, seed’s coefficient of external friction, string diameter and angle of inclination of the separator screen. A string sieve for cleaning and sorting most farm-produced seeds was analyzed. The width of the separating groove was set at 1 mm at the beginning of the screen and 11 mm at the end of the screen, and the strings had the diameter of 4 mm. Our results indicate that seeds cannot be effectively graded in the modeled string sieve. The angular velocity of the crank exceeds the velocity which is applied to power conventional separator buckets, and it could damage the separator. A reduction in the angular velocity of the crank to the recommended level caused seeds to become jammed directly before the screening site. The above problem can be solved by propelling seeds into motion with the use of special sweeping brushes.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2013, 16(4); 253-264
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transverse momentum distributions and string percolation study in p+p, d+Au and Au+Au collisions at square rootsNN = 200 GeV
Autorzy:
Srivastava, B.
Scharenberg, R.
Tarnowsky, T.
Powiązania:
https://bibliotekanauki.pl/articles/148443.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
STAR
RHIC
percolation
string fusion
Opis:
Multiparticle production at high energies is described in terms of color strings stretched between the projectile and target. As string density increases, overlap among the strings leads to cluster formation. At some critical density, a macroscopic cluster appears, spanning the entire system. This marks the percolation phase transition. Data from p+p, d+Au and Au+Au collisions at 200 GeV has been analyzed using the STAR detector to obtain the percolation density parameter, eta. For 200 GeV Au+Au collisions, the value of h is found to lie above the critical percolation threshold, while for 200 GeV d+Au collisions it is below the critical value. This supports the idea of string percolation, which at high enough string density is a possible mechanism to explore the hadronic phase transition to a quark-gluon plasma.
Źródło:
Nukleonika; 2006, 51,suppl.3; 109-112
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying a q-Gram based multiple string matching algorithm for approximate matching
Zastosowanie algorytmu wyszukiwania wielu wzorców opartego o technikę q-Gramów do wyszukiwania przybliżonego
Autorzy:
Susik, R.
Powiązania:
https://bibliotekanauki.pl/articles/952718.pdf
Data publikacji:
2017
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
text processing
approximate string matching
string algorithms
q-gram
przetwarzanie tekstu
wyszukiwanie przybliżone
algorytmy tekstowe
Opis:
We consider the application of multiple pattern matching (Multi AOSO on q-Grams) algorithm for approximate pattern matching. We propose the on-line approach which translates the problem from approximate pattern matching into a multiple pattern one (called partitioning into exact search). Presented solution allows relatively fast search multiple patterns in text with given k-differences(or mismatches). This paper presents comparison of solution based on MAG algorithm, and [4]. Experiments on DNA, English, Proteins and XML texts with up to k errors show that the new proposed algorithm achieves relatively good results in practical use.
Rozważamy zastosowanie algorytmu wyszukiwania wielu wzorców (Multi AOSO on q-Grams) do wyszukiwania przybliżonego. Proponujemy rozwiązanie on-line, upraszczające problem wyszukiwania przybliżonego do wyszukiwania wielu wzorców. Zaprezentowane rozwiązanie umożliwia relatywnie szybko wyszukiwać wiele wzorców dla odległości Levenshteina (lub Hamminga) z ograniczeniem do k. W artykule porównane jest rozwiązanie oparte na algorytmie MAG oraz [4]. Badania eksperymentalne przeprowadzone na zbiorach DNA, English, Proteins and XML z różnymi wartościami k wykazały, że zaproponowany algorytm osiąga relatywnie dobre wyniki w praktycznym zastosowaniu.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2017, 7, 3; 47-50
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The basis property of eigenfunctions in the problem of a nonhomogeneous damped string
Autorzy:
Rzepnicki, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/254937.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
nonhomogeneous damped string
Hilbert space
Riesz basis
modulus of continuity
basis with parentheses
string equation
Opis:
The equation which describes the small vibrations of a nonhomogeneous damped string can be rewritten as an abstract Cauchy problem for the densely defined closed operator iA. We prove that the set of root vectors of the operator A forms a basis of subspaces in a certain Hilbert space H. Furthermore, we give the rate of convergence for the decomposition with respect to this basis. In the second main result we show that with additional assumptions the set of root vectors of the operator A is a Riesz basis for H.
Źródło:
Opuscula Mathematica; 2017, 37, 1; 141-165
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single–word self–referential sentences
Autorzy:
Laudański, Ludomir M.
Powiązania:
https://bibliotekanauki.pl/articles/421309.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
Grelling‟s paradox
logic
string variables
Opis:
The paper discusses the well-known logic paradox formulated by Grelling. It belongs to the class of paradoxes known as Russell's paradoxes. Analysing Grelling‟s paradox, the author arrives at the conclusion showing its apparent nature, in other words resolving the problem.
Źródło:
Didactics of Mathematics; 2013, 10(14); 57-64
1733-7941
Pojawia się w:
Didactics of Mathematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Physical Model of the Nonlinear Sitar String
Autorzy:
Siddiq, S.
Powiązania:
https://bibliotekanauki.pl/articles/177221.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sitar
physical modelling
nonlinear string vibration
dispersion
Opis:
The acoustic properties of the sitar string are studied with the aid of a physical model. The nonlinearity of the string movement caused by the bridge acting as an obstacle to the vibrating string is of special interest. Comparison of the model’s audio output to recordings of the instrument shows interesting similarities. The effects dispersion and bridge have on the sound of the instrument are demonstrated in the model.
Źródło:
Archives of Acoustics; 2012, 37, 1; 73-79
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Theoretical Analysis of Cereal Seed Screening in a String Sieve
Autorzy:
Kaliniewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/298351.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
string sieve
modelling
seeds
angle of inclination
Opis:
The conditions of the screening process in a fixed string sieve designed by the author have been formulated. The string sieve was designed for separating seeds of 5 cereal species (wheat, rye, barley, oats and triticale). The width of the separating groove was set at 1 mm at the beginning of the screen and 5 mm at the end of the screen. It has been assumed that seeds have a spheroidal shape and that their motion is initiated by positioning the string sieve at an appropriate angle. The results of a theoretical analysis revealed that at the given parameters of a string sieve, the above angle is determined only by the thickness and width of separated seeds. The sieve’s angle of inclination should be set at 45° to propel seeds into motion and at 50° to ensure the continuity of the screening process. Such a large setting angle is not recommended because it increases the sieve’s height and deteriorates the quality of the separation process. The problem can be solved by setting the separator bucket into motion and separating seeds at a small inclination angle of the string sieve.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2013, 16(3); 234-247
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of the Capstan Equation to Guitar Strings
Autorzy:
Groves, Tom
Kemp, Jonathan A.
Powiązania:
https://bibliotekanauki.pl/articles/177570.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
guitar
string
friction
saddle
capstan
equation
bridge
Opis:
The effects of friction were observed in electric guitar strings passing over an electric guitar saddle. The effects of changing the ratio of the diameter of the winding to the diameter of the core of the string, the angle through which the string is bent, and the length on either side of the saddle were measured. Relative tensions were deduced by plucking and measuring the frequencies of vibration of the two portions of string. Coefficients of friction consistent with the capstan equation were calculated and were found to be lower than 0.26 for wound strings (nickel plated steel windings on steel cores) and lower than 0.17 for unwound (tin plated steel) strings. The largest values of friction were associated with strings of nar rower windings and wider cores and this may be due to the uneven nature of the contact between the string and saddle for wound strings or due the surface of the windings deforming more, encouraging fresh (and therefore higher friction) metal to metal contact. It is advised to apply lubrication under the saddle to string contact point after first bringing the string up to pitch rather than before in order to prevent this fresh metal to metal contact.
Źródło:
Archives of Acoustics; 2019, 44, 3; 459-465
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
String sieve: design concept and parameters
Autorzy:
Kaliniewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/298037.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
seed
cleaning
sorting
geometric parameters
string sieve
Opis:
This paper presents the design concept and the parameters of a new device for cleaning and-or sorting seeds and grain produced in a conventional farm. The discussed device is a string sieve where the groove between adjacent strings is minimal at the beginning of the screen and increases towards the end of the screen. The proposed sieve poses an alternative to a screen separator comprising a set of differently-sized mesh screens with longitudinal openings. In view of the average size of farm-produced seeds, the width of the separating groove should be set at 1mm at the beginning of the screen and 11 mm at the end of the screen. In sieves not designed for grading large seeds or vetch seeds, the width of the separating groove can be set at 1 mm and 5 mm, respectively.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2013, 16(2); 119-129
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of drill string rotation on the dynamic response of drilling risers
Autorzy:
Major, I. E.
Big-Alabo, A.
Odi-Owei, S.
Powiązania:
https://bibliotekanauki.pl/articles/264843.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
drilling riser
drill string
drill string rotational speed
free vibration
threshold rotational speed
przewód wiertniczy
prędkość obrotowa
wiertło
Opis:
The effect of the rotation of a drill string on the response of a drilling riser has been studied. A governing equation for the flexural response that incorporates the effect of the drill string rotation is developed from first principles, and the resulting differential equation is found to have a variable coefficient, which is a function of the drill string rotational speed. Results simulated for the free vibration response show that the drill string rotation reduces the natural frequency and increases the amplitude of vibration of the drilling riser. The implication of these findings is that neglecting the effect of rotation of the drill string leads to under-estimation of the deflection and over-estimation of the natural frequency. Further analysis reveals that for a drilling riser of given dimensions, a drill string rotational speed exists at which the natural frequency of the drilling riser is theoretical equal to zero, and this rotational speed is the threshold rotational speed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 3; 503-516
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Beyond Textiles: Alternative Uses of Twisted Fibres and Evidence from Akrotiri, Thera
Autorzy:
Vakirtzi, Sophia
Georma, Fragoula
Karnava, Artemis
Powiązania:
https://bibliotekanauki.pl/articles/1774822.pdf
Data publikacji:
2019-01-10
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
thread
string
imprint
Akrotiri
wall paintings
clay sealings
Opis:
Fibre crafts are among the oldest technological practices of mankind. Although commonly associated with textile manufacture, twisted fibres in the form of threads have always had a wider range of use in everyday life. Strings and ropes constitute a humble but essential category of fibre products deriving from the same technology and organic matter as threads. Due to their organic nature, however, they are rarely preserved in the archaeological record, unless special environmental conditions occur. This paper explores the research potential of the imprints of threads and strings in a study focusing on the alternative uses of fibre-spun artefacts. The focus is on the Bronze Age Aegean imprints of threads and strings preserved on objects made of clay and on wall paintings recovered at Akrotiri on Thera. The technical properties of the original threads and strings are evaluated through observation of their imprints, and the fibre technology used for their production is assessed. The methodologies of spindle whorl metrology and experimental spinning are also integrated in the discussion. Ultimately, the use of threads and strings for a variety of purposes, including but not limited to textile production, is discussed.
Źródło:
Światowit; 2017, 56(1); 75-88
0082-044X
Pojawia się w:
Światowit
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alois Hába’s Microtonal Systems and Their Practical Use in Selected String Quartets
Autorzy:
Chorościan, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/514116.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Jagielloński. Koło Naukowe Studentów Muzykologii UJ
Tematy:
Alois Hába
microtonal music
Neue Harmonielehre
string quartets
Opis:
Alois Hába (1893–1973) was one of the most important composers developing the microtonal music in the early 20th century. The list of his works contains many pieces that were composed in quarter-, 1/5- and 1/6-tone systems. In 1927 he published the book titled Neue Harmonielehre, in which he described the innovative harmonic systems using 1/3, 1/4, 1/6 and 1/12 part of tone. The article briefly presents Hába’s life and work and focuses on the composer’s harmonic ideas from Neue Harmonielehre. The theory of microtonality is confronted with the compositional technique through the analysis of four Hába’s string quartets: 2nd Op. 7, 11th Op. 87, 14th Op. 94 and 16th Op. 98. The analysis focuses on the aspects of microtonality: notation, vertical and horizontal use of new microtonal intervals and texture.
Źródło:
Kwartalnik Młodych Muzykologów UJ; 2018, 3(38) Eng; 47-78
2956-4107
2353-7094
Pojawia się w:
Kwartalnik Młodych Muzykologów UJ
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The problem of liquidation of the open eruption by drilling tools
Autorzy:
Bujok, P.
Fibinger, J.
Klempa, M.
Porzer, M.
Kalus, D.
Rado, R.
Powiązania:
https://bibliotekanauki.pl/articles/298940.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
liquidation of open eruption
drilling tools
drill string
Opis:
Drilling process of deep borehole consists of different drilling operations. Each of them can cause numerous different drilling problems especially when a borehole is performed. While drilling the most dangerous problems can occur once the drilling fluids (oil, gas or water) spontaneously flow out from the drilled formations into the borehole and then to the surface. It can also happen that the pressures in the borehole are not balanced and an influx of fluid into the borehole (a kick) will occur. If no action is taken to stop a kick once it begins, then the fluids will be pushed out of the borehole and will be flowing uncontrollably to surface (blow-out). Blow-out is prevented by closing off the well at the surface with special kind of valves (Blow-out Preventers - BOPs). When pressure control over the well is lost, swift action must be taken to avert the severe consequences. These consequences may include: — endangering of human life, — loss of rig and equipment, — negative influence on the environment, — additional costs of bringing the well under control again, — loss of reservoir production. In the case of kick or blow-out will occur in the practical use are different procedures and methods to control a borehole. These procedures and methods depend on the actual drilling operation scenario. One of them can be a tripping operation when the drill string is pulled out or run back again. In this case the drill string is open either after a break-out or before making up the drill pipes and drill collars. There is a variety of tools that can be used to prevent the formation of fluids rising up inside the drill pipes. One of this tool is a safety valve (rod preventers - BOP) to prevent the blow-out of the drill string. This manuał safety valve should be kept on the rig floor at all times. It needs to be a fuli opening ball-type valve so there is no restriction to flow. This valve is installed onto the top of the drill string if a kick occurs during a trip. However, this solution is quite inconvenient and difficult because involves special heavy tools, e.g. a crane. Drilling process of deep borehole consists of different drilling operations. Each of them can cause numerous different drilling problems especially when a borehole is performed. While drilling the most dangerous problems can occur once the drilling fluids (oil, gas or water) spontaneously flow out from the drilled formations into the borehole and then to the surface. It can also happen that the pressures in the borehole are not balanced and an influx of fluid into the borehole (a kick) will occur. If no action is taken to stop a kick once it begins, then the fluids will be pushed out of the borehole and will be flowing uncontrollably to surface (blow-out). Blow-out is prevented by closing off the well at the surface with special kind of valves (Blow-out Preventers - BOPs). When pressure control over the well is lost, swift action must be taken to avert the severe consequences. These consequences may include: — endangering of human life, — loss of rig and equipment, — negative influence on the environment, — additional costs of bringing the well under control again, — loss of reservoir production. In the case of kick or blow-out will occur in the practical use are different procedures and methods to control a bore¬hole. These procedures and methods depend on the actual drilling operation scenario. One of them can be a tripping operation when the drill string is pulled out or run back again. In this case the drill string is open either after a break-out or before making up the drill pipes and drill collars. There is a variety of tools that can be used to prevent the formation of fluids rising up inside the drill pipes. One of this tool is a safety valve (rod preventers - BOP) to prevent the blow-out of the drill string. This manuał safety valve should be kept on the rig floor at all times. It needs to be a fuli opening ball-type valve so there is no restriction to flow. This valve is installed onto the top of the drill string if a kick occurs during a trip. However, this solution is quite inconvenient and difficult because involves special heavy tools, e.g. a crane. This paper presents a new solution making use of special control equipment for the blowing open drill string. This equipment is based on a hydraulic press (named "Drill Pipę Rescue Press I") which has been developed by HBZS, MND S.A. Hodonin and VSB-Technical University of Ostrava, supported by Faculty of Drilling, Oil and Gas AGH-UST Kraków.
Źródło:
AGH Drilling, Oil, Gas; 2014, 31, 2; 199-205
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE PACE OF SPEECH IN AUTISTIC SPECTRUM DISORDER (ASD)
Autorzy:
Michalik, Mirosław
Solak, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2137790.pdf
Data publikacji:
2018-01-03
Wydawca:
Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Tematy:
pace of speech
speed
phonemic string
pragmatic aspect
Opis:
The article presents the results of research into the pace of speech of children with autistic spectrum disorder (ASD) when compared to their peers with no such disabilities. The analysed criteria included: the number of syllables and phones used in 30 second-long utterances, the number of pauses made and their characteristics, and the percentage of the pauses within an utterance. The results of the analysis allowed for the study of the speech pace of the children as well as their general pace of speaking. We tested 5 girls and 11 boys, all of the children were intellectually disabled. The average age of the control group was 9 years and 1 month. Both the quantitative and qualitative aspects of the speech were analysed. The obtained data consisted of audio recordings which were subsequently re-played multiple times in order to properly analyse the crucial phenomena occurring within the speech samples. This part of the research made use of the Audacity software (Audacity(R): Free Audio Editor and Recorder [Computer program]. Version 2.1.0 retrieved September 19th 2015 from http://audacity.sourceforge.net/). The material obtained in the research through the usage of Audacity software was subsequently analysed with the use of the Shapiro-Wilk test and the Mann-Whitney test. Estimative qualitative and quantitative analyses showed differences between the groups in all of the parameters which influence the pace of speech. However, the statistical analyses did not confirm any statistically significant differences in the average pace of speech, the ratio and the percentage of pauses within the speech samples, and the average duration of all types of pauses. The formulated hypotheses for the presence of significant diffe rences in the average pace of speech of children with autistic spec trum disorder and the normative group of children have not been confirmed. No significant differences have been noted in the average pace of speech, the ratio and the percentage of pauses within the speech samples, and the average duration of all types of pauses between the two groups.
Źródło:
Acta Neuropsychologica; 2017, 15(4); 433-441
1730-7503
2084-4298
Pojawia się w:
Acta Neuropsychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Population structure in the Penna model
Autorzy:
Sitarz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1954644.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
biological agein
Penna model
bit-string model
population structure
Opis:
Numerical simulations of growing population, based on the Penna model, are presented. We consider biological ageing as a result of the accumulation of mutations in the genotype. We present an example of simulated population structure and compare it with that of a real population. We also discuss the role of bad mutations threshold parameter T in the Penna model, to reproduce a smooth transition from the oversimplified logistic model (T --> ∞) to the Penna model.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 2; 263-269
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
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