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Tytuł:
The Path-Distance-Width of Hypercubes
Autorzy:
Otachi, Yota
Powiązania:
https://bibliotekanauki.pl/articles/30146525.pdf
Data publikacji:
2013-05-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
path-distance-width
hypercube
Opis:
The path-distance-width of a connected graph G is the minimum integer w satisfying that there is a nonempty subset of S ⊆ V (G) such that the number of the vertices with distance i from S is at most w for any nonnegative integer i. In this note, we determine the path-distance-width of hypercubes.
Źródło:
Discussiones Mathematicae Graph Theory; 2013, 33, 2; 467-470
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Reinforcing Bar Corrosion Level on the Flexural Crack’s Width in the Existing Structure
Autorzy:
Tur, Viktar V.
Yalavaya, Yuliya S.
Powiązania:
https://bibliotekanauki.pl/articles/132027.pdf
Data publikacji:
2019
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
existing structure
corrosion
crack width
Opis:
A study on the influence of the reinforcing bar corrosion level on the flexural crack’s width in the existing structure is presented. Parametric studies of the crack width development of corrosion damage were performed using a block model for the reinforced concrete element with corroded bars. The analytic description of the bond-slip law «t-s» and the establishment of the parametric points of this diagram are decisive in this model. Using the block model, the distribution of the concrete ε ct (x) and reinforcement εs(x) strains for the different level of corrosion damage, normal crack width was obtained and the effect of the level of corrosion damage was established.
Źródło:
Modern Engineering; 2019, 1; 1-9
2450-5501
Pojawia się w:
Modern Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of effective swath width for dual-head multibeam echosounder
Autorzy:
Grządziel, A.
Wąż, M.
Powiązania:
https://bibliotekanauki.pl/articles/320440.pdf
Data publikacji:
2016
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
multibeam echosounder
survey
swath width
Opis:
Many surveying companies and maritime institutions are now using multibeam systems for their operations, either offshore or in coastal and inland waters. Since the time the first multibeam echosounder appeared (late 1970s) the technology has advanced enormously. Modern systems now boast far greater angular coverage (typically 120º–150º) and form hundreds of beams. Dual-head multibeam systems can potentially cover the entire sector (180º) underneath the ship. However surveyors must be aware that the outer beams of these acoustic systems return the most errors causing that the effective swath width is shorter than what the manufacturers declare. The paper presents the methods of estimating of effective (usable) swath width of dual-head multibeam echosounder EM 3002D. Results of the hydrographic survey performed by the polish navy survey ship ORP ‘Arctowski’ have been showed in the article.
Wiele biur hydrograficznych, firm komercyjnych zajmujących się pomiarami oraz instytu-cji i ośrodków szkoleniowych w swoich badaniach morskich i śródlądowych wykorzystuje akustyczne systemy wielowiązkowe. Od czasu pojawienia się pierwszej echosondy wielo-wiązkowej (lata 70. XX w.) technologia prac pomiarowych rozwinęła się na niespotykaną skalę. Nowoczesne systemy oferują dziś znacznie większe robocze kąty pracy przetwor-ników (zazwyczaj 120º–150º) i tworzą setki wiązek. Systemy dwugłowicowe mogą potencjalnie pracować w 180º kącie roboczym pod stępką jednostki. Hydrografowie muszą mieć jednak świadomość, że skrajne wiązki tych systemów generują największe błędy, powodując, że efektywna szerokość pasa pomiarowego danej sondy jest w istocie krótsza niż ta, jaką deklarują światowi producenci. W artykule przedstawiono metodę szacowania efektywnej (użytkowej) szerokości pasa pomiarowego dwuprzetwornikowej sondy EM 3002D. Zaprezentowano wyniki badań przeprowadzonych z pokładu okrętu hydrograficznego ORP ‘Arctowski’ na akwenie Bałtyku południowo-wschodniego.
Źródło:
Annual of Navigation; 2016, 23; 173-183
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response surface methodology assisted multi-objectiveoptimization of TIG process for 15CDV6 steel
Autorzy:
Skariya, P. D.
Satheesh, D. M.
Dhas, J. E.
Chandrasekar, G.
Powiązania:
https://bibliotekanauki.pl/articles/1839113.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
TIG welding
15CDV6 HSLA steel
depth of penetration
bead width
HAZ width
Opis:
Welding is a way of heating pieces of metal usingelectricity or flame so that they melt and stick together. There aremany kinds of welding processes, such as, for instance, MIG/MAGand MMA welding. However, such welding schemes require moreelectrodes during the process of welding. Hence, this paper intendsto analyse the alternative tungsten inert gas (TIG) welding tech-nology using Response Surface Methodology (RSM), and to identifythe effect of TIG welding process parameters on the weld bead pro-file of 15CDV6 high strength low alloy (HSLA) steel. Moreover, themethodology applied allows for identification of the optimal weld-ing conditions by means of multi-objective optimization using RSMto increase the depth of penetration (DOP) and reduce BW (beadwidth) and heat-affected zone (HAZ) width. The variables takenfor the model-based investigations are: welding current (Wc), torchspeed (Ts), gas flow rate (Gr), torch angle (Ta) and arc gap (Ag).Moreover, the responses taken are DOP, BW and HAZ width. Fur-ther, the results from the proposed model optimisation can be seenas highly beneficial for the rocket-motor hardware program, indus-tries and fabrication of pressure vessels, which are using 15CDV6steel.
Źródło:
Control and Cybernetics; 2018, 47, 4; 465-496
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of juniper stands and the impact of environmental parameters on growth in the drought-stressed forest-steppe zone of Central Anatolia
Autorzy:
Kahveci, G.
Alan, M.
Köse, N.
Powiązania:
https://bibliotekanauki.pl/articles/2077936.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Dendrochronology
dendroecology
tree-ring width
exposure
Opis:
Juniper is one of the three main tree species in Central Anatolia, where it grows under extreme environmental conditions. Although dendrochronological studies of juniper are challenging because of cross-dating problems, these types of studies on long-lived tree species have the potential to provide long time series, which reflect changes in climatic conditions. Juniper has been neglected as a scientific research subject in Turkey due to degraded populations and low economic expectations. This study analysed the distribution and present state of Juniperus spp. (Juniperus excelsa M. Bieb., Juniperus oxycedrus L., and Juniperus foetidissima Willd.) stands and used dendrochronological data to examine relationships between growth and environmental parameters. We hypothesised that there may be differences in the radial growth of juniper in areas of different exposure in drought regions. During a field survey, we sampled 31 plots of 25 m × 20 m and data, including information on wood cores, were collected. For dendrochronological investigation, 95 wood cores were manually measured and cross-dated. Residual chronologies of tree-ring width series of juniper from four wind directions and regional chronology of Kirikkale and Ankara Province were provided and similarities between the chronologies were tested using Gleichläufigkeits test. The relationships be- tween climate parameters and growth were examined using a simple correlation analysis and multiple lin- ear regression model analysis in SAS 9.0 program and response function analysis in the DENROCLIM2002 program. The results of this study indicated that Juniperus spp. in Central Anatolia are sensitive to envi- ronmental parameters and mainly respond to changes in precipitation. Juniper show differences in radial growth in areas of different exposure in drought regions. We conclude that juniper may offer an excellent opportunity for large-scale dendrochronological and dendroecological studies in drought regions.
Źródło:
Dendrobiology; 2018, 80; 61-69
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of the inverse base width modulation effect in HBT transistor with graded SiGe base
Autorzy:
Zaręba, A.
Łukasiak, L.
Jakubowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/308625.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
heterojunction bipolar transistor
SiGe
base width modulation
Opis:
A model of the position of the edge of emitter-base junction in the base and collector current pre-exponential ideality factor in HBT transistor with a SiGe base is presented. The model is valid for transistors with nonuniform profiles of doping and Ge content. The importance of taking into account the dependence of the effective density of states in SiGe on local Ge content and that of electron diffusion coefficient in SiGe on drift field for modeling accuracy is studied.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 3; 88-92
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of spiral vanes width on the separation performance of a hydrocyclone
Autorzy:
Liu, Peikun
Wang, Xiaoguo
Jiang, Lanyue
Zhang, Yuekan
Yang, Xinghua
Li, Xiaoyu
Wang, Hui
Powiązania:
https://bibliotekanauki.pl/articles/27323656.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydrocyclone
vane width
numerical simulation
separation performance
Opis:
Aiming at the problem of “entrainment fine particles in underflow” of hydrocyclone in grinding and classification process, a hydrocyclone with spiral vanes (the SV hydrocyclone) was proposed. The CFD techniques were used to study the pressure field, velocity field, turbulence field, particle field and classification efficiency of hydrocyclones with spiral vanes of different widths. The results show that the pressure drop, axial velocity, tangential velocity, turbulence intensity of SV hydrocyclone are reduced in different degrees compared with conventional hydrocyclone, and the reduction becomes more obvious with the increase of vane width. In the case of a vane width of 0.04D, the underflow recovery rate of 5μm and 10μm fine particles was reduced by 16.2% and 15.7%. The selection of spiral vanes with small widths is beneficial to improve the separation accuracy of fine particles and reduce the cut particle size.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 173563
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Realizacja operacji mnożenia o skróconej szerokości w układach FPGA
FPGA implementation of reduce-width multiplier
Autorzy:
Jamro, E.
Wielgosz, M.
Wiatr, K.
Powiązania:
https://bibliotekanauki.pl/articles/154019.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
układ mnożący
układy FPGA
FPGA
fixed-width multiplier
Opis:
Pełne mnożenie dwóch argumentów n-bitowych daje rezultat o szerokości 2xn-bitów. W większości przypadków stosuje się mnożenie o skróconej szerokości gdzie np. dodatkowe n najmłodszych bitów wyniku jest odrzucane. Niniejszy artykuł prezentuje nową metodę kompensacji błędu obliczeń dla mnożenia o skróconej szerokości szczególnie wydajną w przypadku użycia układów FPGA. Podstawą proponowanej architektury jest podawanie na niewykorzystywane do tej pory wejście przeniesienia wybranych bitów argumentów wejściowych układu mnożącego.
The paper presents a novel metod of the error compensation for a reduce-width multiplier implemented in FPGAs. For a standard multiplier and the bit-width equal to n for both inputs, the output width is equal to 2?n. In order to obtain a fixed-width multiplier, the n-LSBs of the output should be truncated. Lan-Da Van et. al. [1, 2] presented the error compensation method appropriate for ASIC, however, this method cannot be directly employed in FPGAs due to relatively high hardware resources and a different multiplier structure (compare Fig. 1 and Fig. 2). The main idea of the proposed error compensation method is to feed carry input directly with the selected bits of the multiplier input (see Fig. 4). The implementation results shown in Fig. 5 confirm the significant reduction of the truncation error, especially for the mean error which is close to zero. It should be noted that the error compensation circuit employs the normally unused carry-in input, therefore no additional FPGA resources are required by the proposed method.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 8, 8; 669-671
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser frequency counting and frequency modulation width measurement from a FFT signal
Autorzy:
Křen, P.
Powiązania:
https://bibliotekanauki.pl/articles/221880.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser
modulation width
frequency measurement
optical frequency synthesizer
Opis:
A new method of optical frequency beat counting based on fast Fourier transform (FFT) analysis is described. Signals with a worse signal-to-noise ratio can be counted correctly comparing to the conventional counting method of detecting each period separately. The systematic error of FFT counting below 10 Hz is demonstrated and can be decreased. Additionally the modulation width of a frequency-stabilized laser with high frequency modulation index can be simultaneously measured during a carrier frequency measurement against an optical frequency synthesizer or other laser.
Źródło:
Metrology and Measurement Systems; 2012, 19, 3; 565-572
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie łączenia tarcicy na szerokość za pomocą kołków
Issledovanie po soedineniju piromateriala na shirinu s pomoshhju shipov
Investigitation on connection of sawnwood for width by means of pegs
Autorzy:
Graj, L.
Powiązania:
https://bibliotekanauki.pl/articles/808924.pdf
Data publikacji:
1990
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
badania
laczenie
tarcica
szerokosc
kolki
connection
timber
width
Opis:
В условиях повышенного спроса на древесину и постоянной тенденпии к переработке все более тонких сортиментов круглой древесины ледует считаться с трудностями в обеспечении соответствующих количеств пиломатериалов одинаковой крупной ширины. В связи с этим были проведены исследования по проверке и испольэванию технологических возможностей, которые бы позволили использовать в производстве пиломатериалы с шириной более узкой, чем ширина клееных элементов. Лабораторные опыты охватывали следующие этапы: а) изготовление из соснового пиломатериала толщиной 25 мм образпов размером 50 х 50 х 25 мм, б) выполнение соединения 2 образцов их боковыми поверхностями (поперек волокон) - с помощью склеивания, - с помощью желобчатых круглых широв размером 6 х 32, 8 х 36 и 10 х 40 мм.
At increased demand for wood and constant tendency to process thinner and thinner round wood assortments, it is to be reckoned with difficulties in getting a suitable sawnwood amount with equal great width. In this connection investigations on estimation and preparation of technological possibilities of using in production the sawnwood narrower than the width of glued elements have been undertaken. The laboratory tests comprised the following stages: a) making samples of 50 x 50 x 25 mm from 25 mm thick pine sawnwood, b) connection of 2 samples by their lateral areas (across fibres) by means of glueing, by round riffled pegs of 6 x 32, 8 x 36 and 10 x 40 mm, c) determination of forces in daN required for setting pegs in openings depeni ing on the fitting precision and needed for destruction of differently made joint by bending and tension of samples.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 1990, 379
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorithmic Aspects of Secure Connected Domination in Graphs
Autorzy:
Kumar, Jakkepalli Pavan
Reddy, P. Venkata Subba
Powiązania:
https://bibliotekanauki.pl/articles/32327157.pdf
Data publikacji:
2021-11-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
secure domination
complexity classes
tree-width
chordal graphs
Opis:
Let G = (V, E) be a simple, undirected and connected graph. A connected dominating set S ⊆ V is a secure connected dominating set of G, if for each u ∈ V \ S, there exists v ∈ S such that (u, v) ∈ E and the set (S \ {v}) ∪ {u} is a connected dominating set of G. The minimum size of a secure connected dominating set of G denoted by γsc(G), is called the secure connected domination number of G. Given a graph G and a positive integer k, the Secure Connected Domination (SCDM) problem is to check whether G has a secure connected dominating set of size at most k. In this paper, we prove that the SCDM problem is NP-complete for doubly chordal graphs, a subclass of chordal graphs. We investigate the complexity of this problem for some subclasses of bipartite graphs namely, star convex bipartite, comb convex bipartite, chordal bipartite and chain graphs. The Minimum Secure Connected Dominating Set (MSCDS) problem is to find a secure connected dominating set of minimum size in the input graph. We propose a (∆(G)+1)-approximation algorithm for MSCDS, where (G) is the maximum degree of the input graph G and prove that MSCDS cannot be approximated within (1 − ɛ) ln(|V|) for any ɛ > 0 unless NP ⊆ DTIME |V|O(log log |V|)) even for bipartite graphs. Finally, we show that the MSCDS is APX-complete for graphs with Δ(G) = 4.
Źródło:
Discussiones Mathematicae Graph Theory; 2021, 41, 4; 1179-1197
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of meteorological conditions in the growth of Robinia pseudoacacia on the basis of pointer years in urban conditions
Autorzy:
Kalbarczyk, Robert
Ziemiańska, Monika
Powiązania:
https://bibliotekanauki.pl/articles/957003.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
air temperature
rainfall
dendroclimatology
tree ring width
black locusts
Opis:
This study assessed changes in air temperature and rainfall during the growth of black locusts (Robinia pseudoacacia L.) in urban conditions in the city of Wroclaw based on pointer years. Materials consisted of 54 wooden discs taken from felled straight-trunked trees at a height of 1.3 m from the ground at four sampling sites in the area of a defunct garden established at the turn of the 20th century. Meteorological indicators were calculated based on monthly data obtained from the Wroclaw meteorological station, part of the national atmospheric monitoring network. Tree ring widths were determined using LINTABTM 6 and TSAP-Win software. A set of meteorological elements describing temperature and rainfall conditions during the growth of the black locusts significantly affecting the tree ring widths, were selected using cluster analysis. Pointer years were defined as the years when a unidirectional change (e.g. an increase) in tree ring width compared to a previous year was observed in at least 75% of the trees. In the multiannual period 1955–2014 we found seven pointer years, comprising three positive years (tree ring wider than in the year before): 1986, 1989, 1996, and four negative years (tree ring narrower than in the year before): 1963, 1983, 1990, 1991. The width of the tree rings were formed under the influence of different unique thermal and rainfall systems each year. Within the groups of positive and negative pointer years, individual months differed in the impact of air temperature and rainfall conditions on tree ring widths.
Źródło:
Dendrobiology; 2017, 77; 33-43
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wskaźnika zadrzewienia drzewostanu na wybrane cechy makrostruktury i gęstość drewna świerkowego (Picea abies (L.) Karst.)
Effect of stand density index on selected features of macrostructure and density of Norway spruce (Picea abies (L.) Karst.) wood
Autorzy:
Michalec, K.
Powiązania:
https://bibliotekanauki.pl/articles/978906.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
tree−ring width
latewood proportion
wood density
Norway spruce
Opis:
The aim of the study was to determine the influence of stand density index on the tree−ring width, latewood proportion and wood density for Norway spruce. Study sites were located as follows: 12 within the north−eastern species range in Poland, 7 in the south−western range, in the Sudety Mts., and 9 in the Carpathians (southern range). Clustering stands according to their stand density index, 10 data groups were established: stand density index values from 0.3 to 1.2. The study plots were 100×100 m squares. On each plot 15 trees were chosen and increment cores were sampled using the Pressler borer. The smoothed cores served for measuring the width of annual rings, latewood zones and the share of latewood as well as for determination of relative wood density. The performed analyses indicate that mean tree−ring width was the highest in trees from stands with density index from 0.3 to 0.8 (with the exception of 0.7), whereas the it was gradually decreasing in stands with index higher than 0.9. The statistically significant differences between the analyzed stands were observed (p<0.0001). The analysis of the influence of stand density index and the width of annual rings revealed significant, negative weak correlation (r=–0.242, p<0.001). In turn, the latewood proportion was the highest in trees from stands characterised by the highest stand density index and the lowest in trees from stands with the lowest one. The differences between analyzed groups of stands were statistically significant (p<0.0001), as well as the correlation which was significant, positive and weak (r=0.269, p<0.001). Wood density was the highest in trees from stands with the highest stand density index (1.1 – 363 kg/m3 i 1.2 – 365 kg/m3) as well as in those from stands characterised by 0.7 density index (369 kg/m3). Significant differences were observed (p<0.0001) only between stand density index 0.3−0.7 and 0.7−0.8. Significant correlation was not observed.
Źródło:
Sylwan; 2020, 164, 09; 719-725
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of vessel traffic flows on a waterway bend
Autorzy:
Przywarty, M.
Dzwonkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/135120.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
vessel traffic flows
traffic intensity
fairway width
fairway bend
Opis:
This paper presents preliminary results of research to develop a method of analysis of chosen parameters of vessel traffic flows on a bend in a waterway. Assumptions within the model are based on the geometrical dependences and, for a significant part, on expert experience and real life manoeuvring tactics. The work is focused on the analysis of coordinates of a ship, reduced to its centre of gravity, for different input and assumed output parameters. The proposed method allows also for the analysis of other parameters that influence navigational safety such as rate of turn. The results confirm the possibility of assessment of traffic flow parameters with use of the developed method. In the next stages of the work, algorithms which are capable of accounting for human factors and external conditions can be implemented.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 50 (122); 68-74
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Way to reduce subgrade in highway construction
Autorzy:
Nemchinov, M. V.
Vasilyeva, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/402409.pdf
Data publikacji:
2016
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
subgrade
soil volumes
pipe
flow
width
depth
water discharge
Opis:
There is formulated the dement of minimum of land works in road construction. For it is suggested new method to construct road pipes and new method of their hydraulic design.
Źródło:
Structure and Environment; 2016, 8, 3; 147-152
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
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