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Wyświetlanie 1-15 z 1060
Tytuł:
Inverse semigroup rings
Autorzy:
Munn, W. D.
Powiązania:
https://bibliotekanauki.pl/articles/719155.pdf
Data publikacji:
1990
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Banach Center Publications; 1990, 26, 1; 65-73
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel polymorphic mtDNA marker for population studies of the pink shrimp, Farfantepenaeus duorarum (Crustacea, Penaeidae)
Autorzy:
Grabowski, M.
Grater, W.D.
Stuck, K.C.
Powiązania:
https://bibliotekanauki.pl/articles/47488.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
pink shrimp
Atlantic coast
Penaeidae
mtDNA marker
population structure
Farfantepenaeus duorarum
Mexico Gulf
Crustacea
genetic marker
Opis:
The pink shrimp, Farfantepenaeus duorarum, is one of the most important shrimp species commercially harvested along the Gulf and Atlantic coasts of the US. In this study we developed a mitochondrial marker suitable for population studies of the species. A 611–617 bp hypervariable portion of the AT-rich region of the mt genome was amplified and sequenced. The 617 bp long consensus sequence contained 15 polymorphic insertion/deletion sites and 165 polymorphic substitution sites. Kimura 2-parameter distances ranged from 0.00 to 0.06 with a mean of 0.02. Among the 104 sequences, 100 haplotypes were counted if all mutations were included. If transitions were omitted, 34 haplotypes were observed. The results indicate that the hypervariable portion of the AT-rich region may be an effective marker for revealing the genetic structure of the pink shrimp off the southeast US.
Źródło:
Oceanologia; 2004, 46, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indirect adaptive neural controller of nonlinear systems using auto-tuning neuron
Autorzy:
Chang, W.-D.
Hwang, R.-C.
Hsieh, J.-G.
Powiązania:
https://bibliotekanauki.pl/articles/206236.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sterowanie adaptacyjne pośrednie
podejście Lapunowa
sterowanie nadzorcze
mechanizm adaptacyjny
auto-tuning neuron
indirect adaptive control
Lyapunov approach
supervisory control
adaptation mechanism
Opis:
In this paper, a novel indirect adaptive neural controller using only two auto-tuning neurons is developed for a class of nonlinear systems. Unlike traditional multi-layered neural controllers, the structure of the proposed controller is very simple and practicable. There are three adjustable parameters in each auto-tuning neuron. Two such auto-tuning neurons used in our proposed indirect adaptive controller are used to track on-line the desired signal. The adaptation law for adjusting these parameters is developed based on the Lyapunov approach. Moreover, the stability of the overall closed-loop system can be analyzed and guaranteed by introducing the additional supervisory controller and the technique of modified adaptation law with projection. Finally, the tracking control of the inverted pendulum system is presented to illustrate the proposed method.
Źródło:
Control and Cybernetics; 2003, 32, 2; 313-327
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk analysis on ship wreck and container cargo to ship navigation
Autorzy:
Zaman, M.B.
Pitana, T.
Iswantoro, A.
Aryawan, W.D.
Powiązania:
https://bibliotekanauki.pl/articles/117044.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
ships manoeuvering
risk analysis
ship wreck
container
ship navigation
risk matrix
risk acceptance criteria
ship accidents
Opis:
Wreck of a ship is an incident that must be avoided. Ship accidents are generally caused by a several cases, such as human error, natural disaster, technical errors, missed communication, poor condition of the ship, and many more. Ship wreckage have huge impact for ship navigation, environment, economics, and others. Those impact have many disadvantages for the shipowners, and also for environment. For examples the fuel spills that pollute the environment, make disturbance to sailing ship because the track for those navigation is blocked by the ship wreck and their cargo especially on shallow location (<50 m). These research will discuss the effect the container when it is floats on the sea and its interference other ships. The main objective of this study is to present a risk assessment on the environmental impact of the wreck and container cargo. Wrecks on the seabed is likely to pose a risk to passing ships. container and its contents as well as the possibility of refloat, and also their environmental risks emanating from the wreck and container cargo, such as fuels, lubricants, and chemical cargo. Variations scenario is a collision between ships that pass by floating containers. The frequency of refloating container, and the consequences of the passing ship depends on several factors, which will be the subject of research. However, because of the frequency of refloating containers is unlikely, then the risk is low and does not pose a danger to navigation. These risk assessment using risk matrix 5x5 which is the combined value of the frequency and consequences of the incident. The results of this study indicate the level of risk, whether the risk is accepted, not accepted or received by considering the costs and benefits (ALARP). To consequence, there are two parameters which energy is absorbed and the penetration occurs. The absorbed energy is divided into two, namely the energy absorbed by ship and the energy absorbed by containers. In this study were taken 5 groups based on the size of the vessel. In this cases any 5 size group of vessels is based on the size of the ships that pass in the shipping lanes at the site of the sinking. Assumed these vessels have speed 10 knots at the location. As well as speed drifting containers having 0 to 3 knots.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 1; 71-77
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research history, taphonomy, and age structure of a mass accumulation of the ornithopod dinosaur Dysalotosaurus lettowvorbecki from the Upper Jurassic of Tanzania
Autorzy:
Hubner, T.R.
Foth, C.
Heinrich, W.-D.
Schwarz, D.
Bussert, R.
Powiązania:
https://bibliotekanauki.pl/articles/2082333.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Crocodylomorpha
Thalattosuchia
Metriorhynchidae
Lower Cretaceous
Valanginian
Czech Republic
Opis:
Metriorhynchid crocodylomorphs were an important component in shallow marine ecosystems during the Middle Jurassic to Early Cretaceous in the European archipelago. While metriorhynchids are well known from western European countries, their central and eastern European record is poor and usually limited to isolated or fragmentary specimens which often hinders a precise taxonomic assignment. However, isolated elements such as tooth crowns, have been found to provide informative taxonomic identifications. Here we describe two isolated metriorhynchid tooth crowns from the upper Valanginian (Lower Cretaceous) of the Štramberk area, Czech Republic. Our assessment of the specimens, including multivariate analysis of dental measurements and surface enamel structures, indicates that the crowns belong to two distinct geosaurin taxa (Plesiosuchina? indet. and Torvoneustes? sp.) with different feeding adaptations. The specimens represent the first evidence of Metriorhynchidae from the Czech Republic and some of the youngest metriorhynchid specimens worldwide.
Źródło:
Acta Palaeontologica Polonica; 2021, 66, 2; 357-367
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visual acuity with computer simulated and lens-induced astigmatism
Autorzy:
Remón, L
Benlloch, J
Pons, A
Monsoriu, J A
Furlan, W D
Powiązania:
https://bibliotekanauki.pl/articles/173207.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
visual acuity
simulated defocus
astigmatism
lens-induced defocus
power vector
Zernike polynomials
Opis:
The relationship between spherical and astigmatic refractive errors and their associated visual acuity is investigated in this work by means of two different approaches. In the first one, different refractive errors were induced in normal subjects by trial lenses. In the second one, defocused images were simulated numerically by the optical transfer function of a model eye and then judged by the same subjects. The amount of defocus (measured in terms of the modulus of the dioptric power vector) necessary to reduce the visual acuity to 0.1 logMAR and to 0.4 logMAR was computed with each method and then compared. We found that the visual system is clearly more tolerant to lens-induced defocus than for the computer simulated one. However, no significant differences in visual acuity were found for astigmatism of the same power but different axes in each method.
Źródło:
Optica Applicata; 2014, 44, 4; 521-531
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Research on Characterization of Crushability for Foundry Sand Particles
Autorzy:
Dai, Y.
Ma, Q. Y.
Li, X. H.
Zhang, X.
Hu, F. P.
Zhang, Y.
Xie, W. D.
Powiązania:
https://bibliotekanauki.pl/articles/379689.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry sand particle
mechanical load
AFS grain fineness
crushability
piasek odlewniczy
obciążenie mechaniczne
rozdrobnienie ziarna
Opis:
In this paper, crushability of foundry sand particles was studied. Three kinds of in-service silica sands in foundry enterprises selected as the study object, and foundry sand particles were subjected to mechanical load and thermal load during service were analyzed. A set of methods for simulating mechanical load and thermal load by milling and thermal-cold cycling were designed and researched, which were used to characterize the crushability for silica sand particles, the microstructure was observed by SEM. According to the user’s experience in actual application, the crushability of Sand C was the best and then Sand B, the last Sand A. The results indicated that mechanical load, thermal load and thermal-mechanical load can all be used to characterize the crushability of foundry sand particles. Microscopic appearances can qualitatively characterize the crushability of foundry sand particles to a certain extent, combining with the additions and cracks which are observed on the surface.
Źródło:
Archives of Foundry Engineering; 2017, 17, 4; 231-235
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport and Magnetic Properties of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Te Doped with Cr and Mo
Autorzy:
Artamkin, A. I.
Kozhanov, A. E.
Arciszewska, M.
Dobrowolski, W. D.
Story, T.
Slynko, E. I.
Slynko, V. E.
Khokhlov, D. R.
Powiązania:
https://bibliotekanauki.pl/articles/2038231.pdf
Data publikacji:
2004-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.28.+d
Opis:
Transport and magnetic properties of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Te (x<0.18) semiconductor alloys doped with Cr or Mo are investigated in a broad range of temperatures and magnetic fields. In PbMnTe(Cr) alloys the Fermi level may be pinned either in the conduction band or in the energy gap, depending on Mn concentration. In PbMnTe(Mo) alloys the pinning of the Fermi level is observed in the valence band as well as in the energy gap. In the latter case persistent photoconductivity is observed at low temperatures. The analysis of the temperature dependence of magnetic susceptibility shows that PbMnTe alloys doped with Cr or Mo are Curie-Weiss paramagnets revealing weak antiferromagnetic interactions between magnetic ions.
Źródło:
Acta Physica Polonica A; 2004, 106, 2; 223-231
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation and sequence analysis of the complete VP2 gene of canine parvovirus from Chinese domestic pets and determination of the pathogenesis of these circulating strains in beagles
Autorzy:
Chen, M.R.
Guo, X.Y.
Wang, Z.Y.
Jiang, Y.T.
Yuan, W.F.
Xin, T.
Hou, S.H.
Song, T.Q.
Lin, W.D.
Zhu, H.F.
Jia, H.
Powiązania:
https://bibliotekanauki.pl/articles/2087542.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
canine parvovirus
molecular epidemiology
phylogenetic analysis
pathogenesis
Źródło:
Polish Journal of Veterinary Sciences; 2019, 2; 287-296
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integral formulae for special cases of Taylors functional calculus
Autorzy:
Albrecht, D. W.
Powiązania:
https://bibliotekanauki.pl/articles/1292783.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
In this paper integral formulae, based on Taylor's functional calculus for several operators, are found. Special cases of these formulae include those of Vasilescu and Janas, and an integral formula for commuting operators with real spectra.
Źródło:
Studia Mathematica; 1993, 105, 1; 51-68
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Keynote Forum, Major Issues & Poster Presentations at the 3rd International Conference on Nursing & Midwifery, May 23-24, 2018 in New York, USA
Autorzy:
Mazurkiewicz, D.W.
Powiązania:
https://bibliotekanauki.pl/articles/1918604.pdf
Data publikacji:
2018-06-21
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Terrorism
perimortem Caesarean delivery (PMCD)
continuous electronic fetal monitoring (CEFM)
maternal death
infant mortality
cancer
pregnancy
abuse of nurses
Opis:
The 3rd International Conference on Nursing & Midwifery, held on May 23-24, 2018 in New York, USA was characterized by a multitude of topics addressing professional issues of importance to midwives and nurses. Prevailing subjects focused on the following: * professional functioning of midwives facing the risk of terrorism and terrorist attack, * the role of CEFM on childbirth outcomes, * attitudes of nursing students towards individuals with mental illness, * healing the abuse of nurses, * substance-dependent women and motherhood, *nursing-crisis of maternal and infant mortality in the United States, * nurses and midwives attitudes toward overweight and obese during childbirth, * quality of life of patients undergoing cancer treatment, * effectiveness of spiritual group therapy among women with breast cancer, * prevalence of delayed umbilical cord clamping practices, *problems among women with late pregnancy loss, * current care for older people, * HIV in Sub Saharan Africa, * sexual problems in gynecological cancers and nursing approaches.
Źródło:
Progress in Health Sciences; 2018, 8(1); 234-243
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The topic about midwifery healthcare in the event of a mass terrorist attack among Keynote Presentations at the International Conference on „Nursing Diagnosis & Midwifery 2018”
Autorzy:
Mazurkiewicz, D.W.
Powiązania:
https://bibliotekanauki.pl/articles/1918793.pdf
Data publikacji:
2019-01-07
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Midwifery healthcare
pathology
pregnancy
terrorism
terrorism outcomes
Opis:
The International Conference "Nursing Diagnosis & Midwifery 2018" held on 10-11 September 2018 in Prague (Czech Republic) was important for the international environment of midwives and nurses. The Event gathered representatives of medical professions from almost all continents. Over 26 lectures on various medical and nursing topics and poster sessions were presented. This allowed for the deepening of knowledge in field ofmidwifery, nursing and medical related sciences. It was a great opportunity to discussissuesthat are omitted in the framework of midwiferyand nursing programs, where such topicsare very important in the face of the threat of terrorism not only in the European Union.
Źródło:
Progress in Health Sciences; 2018, 8(2); 243-248
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Data probes, vertical trajectories and classification: A tentative study
Autorzy:
Pearson, D. W.
Powiązania:
https://bibliotekanauki.pl/articles/911252.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
klasyfikacja
zerowanie wyjścia
sterowanie nieliniowe
geometria różniczkowa
classification
output zeroing
nonlinear control
differential geometry
Opis:
In this paper we introduce a method of classification based on data probes. Data points are considered as point masses in space and a probe is simply a particle that is launched into the space. As the probe passes by data clusters, its trajectory will be influenced by the point masses. We use this information to help us to find vertical trajectories. These are trajectories in the input space that are mapped onto the same value in the output space and correspond to the data classes.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2007, 17, 1; 107-112
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1060

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