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Tytuł:
Optimal decision rules
Autorzy:
Girlich, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/720453.pdf
Data publikacji:
1985
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Banach Center Publications; 1985, 16, 1; 115-122
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Meat processing under limited energy supply
Przerób mięsa przy ograniczonej podaży energii
Autorzy:
Raeuber, H.J.
Powiązania:
https://bibliotekanauki.pl/articles/1399326.pdf
Data publikacji:
1988
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Opis:
The main energy economissing effect can be reached by full utilization of slaughter animal raw material because of an energy consuming share of 97% by primary production of animals in agriculture. Further effects result from strickt controlling of thermal parameters, using non-thermal procedures for preservation, avoiding thermal round about ways in processing. Biotechnological biomass production will be able to substitute meat protein by a very low energy consuming procedure.
Główny efekt oszczędności energii w przemyśle mięsnym może być osiągnięty przy pełnym wykorzystaniu surowców rzeźnych; udział zużycia energii na wyprodukowanie żywca rzeźnego wynosi bowiem 97%. Dalsze oszczędności energii mogą być uzyskane przez ścisłą kontrolę parametrów procesów termicznych, unikanie niepotrzebnych energochłonnych naprzemiennych procesów termicznych (jak zamrażanie, rozmrażanie, obróbka cieplna i ponowne zamrażanie), jak również zastosowanie innych, poza termicznymi, procesów utrwalania mięsa (realizacja „koncepcji barierowej", wykorzystanie bakteryjnych kultur starterowych i innych procesów biotechnologicznych, utrwalanie radiacyjne). Generalnie produkcja białka mięsnego jest jednak wysoce energochłonna. Produkcja biomasy białkowej metodą bakteriologiczną pozwoli zastąpić białko mięsa przy bardzo niskim relatywnie nakładzie energii.
Źródło:
Acta Alimentaria Polonica; 1988, 14(38), 1; 81-86
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bovine demodicidosis-lesions and the resulting damage to hides and leather
Demodekoza bydlęca - zmiany chorobowe i ich wpływ na jakość skór
Skotnyjj demodekoz - boleznennye izmenenija i ikh vlijanie na kachestvo kozhi
Autorzy:
Smith, H.J.
Powiązania:
https://bibliotekanauki.pl/articles/2177880.pdf
Data publikacji:
1967
Wydawca:
Polskie Towarzystwo Parazytologiczne
Opis:
Omówiono zasięg występowania, wygląd zmian i objawy kliniczne, rozmieszczenie uszkodzeń chorobowych na ciele, wygląd i rozpoznawanie uszkodzeń na skórach po usunięciu sierści oraz uszkodzenia skór wyprawionych spowodowane demodekozą.
Źródło:
Wiadomości Parazytologiczne; 1967, 13, 4-5; 543-546
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Führungssysteme im Wandel von Sicherheitspolitik und Strategie
Autorzy:
Jentzsch, H.-J.
Powiązania:
Europäische Sicherheit 1995, nr 2, s. 34-37
Data publikacji:
1995
Tematy:
Dowodzenie systemy automatyzacja Niemcy, Republika Federalna 1995 r.
Informatyka wojskowa Niemcy, Republika Federalna 1995 r.
Systemy informatyczne stosowanie wojsko Niemcy, Republika Federalna 1995 r.
Opis:
Rola i znaczenie informatyki wojskowej w zautomatyzowanych systemach kierowania i dowodzenia rodzajów sił zbrojnych i wojsk RFN.
Schem.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Resonance Ionization Spectroscopy and its Application
Autorzy:
Kluge, H.-J.
Powiązania:
https://bibliotekanauki.pl/articles/1931508.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Fb
Opis:
Resonance ionization spectroscopy and its combination with mass spectrometry offer very high sensitivity and selectivity. The application of several variants of resonance ionization mass spectroscopy to the study of nuclear ground state properties and trace analysis of radioactive isotopes in the environment is discussed as well as the inverse process, i.e. the laser induced recombination, of bare heavy ions stored at relativistic energies in storage rings.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 159-171
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systemy impregnacji – porównanie lakierów i śywic pod względem ekonomicznym, ekologicznym i technicznym
Impregnation system - economical, ecological and technical comparsion between varnishes and resins
Autorzy:
Rausch, H.J.
Powiązania:
https://bibliotekanauki.pl/articles/1373749.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
impregnacja
lakiery
żywice
Opis:
The reason why nowadays the use and consumption of varnish or solvent-cut resins has drastically decreased since 1998 in the industry. This elaboration will bring answers for such a questions like: why varnishes do not meet anymore the technical, economical and ecological standards imposed today by Industry? What is the difference between varnish and resin? How are the results of impregnation with a field coil between a varnish and 1-component polyester resin? How much resin will stay in above of cases between the windings?
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2009, 82; 259-262
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Young Baltic advance in the western Baltic depression
Autorzy:
Stephan, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/2059318.pdf
Data publikacji:
2001
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Palaeo-ice stream
Baltic Depression
Weichselian
till facies
ice flow
Opis:
The last Weichselian glacial advance into the western Baltic depression, the so-called "Young Baltic" glacier advance is described. In the southern Baltic depression, ice masses flowed westwards and fanned out in the western Baltic region where they terminated along the end moraines of the East Jutland advance (Denmark), Sehberg advance (Schleswig-Holstein) and Mecklenburg advance (Mecklenburg-Vorpommern). The westward ice advance is likely due to the rapid melting of Norwegian and Swedish ice masses which had previously blocked the more easterly ice masses from draining to the west and north-west. The deposition of a purely eastern-sourced debris facies by a Baltic ice stream in the far west might be the result of ice/bed separation during flow.
Źródło:
Geological Quarterly; 2001, 45, 4; 359-364
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impacts of technologies on physical properties of agronomic materials
Autorzy:
Hellebrand, H.J.
Powiązania:
https://bibliotekanauki.pl/articles/26309.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
moisture
drying
physical property
grain
agronomic material
plant colour
plant product
technology
mechanical property
Źródło:
International Agrophysics; 1998, 12, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bovine demodicidosis-lesions and the resulting damage to hides and leather
Demodekoza bydlęca - zmiany chorobowe i ich wpływ na jakość skór
Skotnyjj demodekoz - boleznennye izmenenija i ikh vlijanie na kachestvo kozhi
Autorzy:
Smith, H.J.
Powiązania:
https://bibliotekanauki.pl/articles/837836.pdf
Data publikacji:
1967
Wydawca:
Polskie Towarzystwo Parazytologiczne
Opis:
Omówiono zasięg występowania, wygląd zmian i objawy kliniczne, rozmieszczenie uszkodzeń chorobowych na ciele, wygląd i rozpoznawanie uszkodzeń na skórach po usunięciu sierści oraz uszkodzenia skór wyprawionych spowodowane demodekozą.
Źródło:
Annals of Parasitology; 1967, 13, 4-5
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Künftige Rolle und Aufgabe der deutschen Marine
Autorzy:
Mann, H.-J.
Powiązania:
Europäische Sicherheit 1994, nr 4, s. 161-163
Data publikacji:
1994
Tematy:
Marynarka wojenna zadania NATO Niemcy, Republika Federalna 1994 r.
Obszary operacyjne morskie NATO Niemcy, Republika Federalna 1994 r.
Opis:
Operacyjny obszar działania sił morskich RFN w ramach NATO. Koncepcje użycia sił morskich. Zgodność stawianych zadań z celami i założeniami polityki zagranicznej Niemiec.
Fot.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Die Aufgabe der deutschen Luftwaffe in der sich verändernden NATO
Autorzy:
Kübart, H.-J.
Powiązania:
Wehrtechnik 1994, nr 7, s. 5-6
Data publikacji:
1994
Tematy:
Siły powietrzne organizacja zadania NATO Niemcy, Republika Federalna 1994 r.
Wojska szybkiego reagowania jednostki lotnicze projekty NATO Niemcy, Republika Federalna 1994 r.
Opis:
Rola niemieckich sił powietrznych w nowej sytuacji polityczno-wojskowej i zachodzących zmianach w NATO. Planowany udział jednostek lotnictwa w składzie sił reagowania.
Fot.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Boundary integral solution for a class of fourth-order two-point boundary value problems
Autorzy:
Al-Gahtani, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/122949.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
boundary integral method
fourth-order differential equation
nonlinear ordinary differential equations
nieliniowe równania różniczkowe zwyczajne
równanie różniczkowe czwartego rzędu
Opis:
In this paper, a boundary integral method is proposed for the solution of a class of fourth-order two-boundary value problems described by the equation yiv+P(x, y, y’, y’’, y’’’) = 0, x ∈ ( 0,L), where P is a polynomial function of its arguments. The differential equation is cast in an integral form and the weighted residual technique is used to generate the corresponding boundary integral equations. The boundary integral equations are then, solved by expressing the dependent variable, y, in terms of a power series. The proposed method is tested through four examples to show the applicability of the method to solve a wide range of fourth-order differential equations including the nonlinear ones.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 3; 5-13
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activities for the protection of historical cultural landscapes as a supplementary tool for land management with the aim of the development of local and regional potential
Autorzy:
Linke, H.J.
Hernik, J.
Powiązania:
https://bibliotekanauki.pl/articles/62282.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
landscape protection
historical cultural landscape
land management
local development
local potential
regional potential
regional development
cultural landscape
protection activity
Opis:
More and more frequently, one witnesses these days the appearance of a new approach to historical cultural landscapes. Not only do they now embrace objects of historical and environmental value, but also the potential for local and regional development. However, such an understanding of historical cultural landscapes, as a potential for local and regional development, necessitates additional instruments, plans, approaches, and methodologies. The article presents an analysis of a landscape plan in Germany and a case study on the potential of historical cultural landscapes for local and regional development in Poland. Conducted studies reveal the usefulness of activities for the protection of historical cultural landscapes in the context of land management. Such activities contribute to the improvement of landscape protection and conservation methods, taking into consideration their potential for local and regional development at the same time.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2010, 11
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and simulation in KRAB zinc-finger research
Modelowanie i symulacja w badanich KRAB palców cynkowych
Autorzy:
Frischmuth, K.
Thiesen, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/404049.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Symulacji Komputerowej
Tematy:
modelowanie
symulacja
palce cynkowe
KRAB
biologia systemowa
modelling
simulation
zinc fingers
systems biology
Opis:
The human genome encodes about 350 KRAB zinc finger genes. The KRAB domain represents one of the strongest repression domains found in mammalian organisms. Antisera against numerous KRAB-ZNF proteins have been generated to dissect their biological functions in respect to expression patterns in normal and cancer tissues, which finally allows systems biology oriented modeling approaches. By numerical simulation we study the temporal evolution of a set of genes, assuming a certain model for interactions between their expression levels. Classification methods like SVM play an important role in the identification of the model.
Geny człowieka kodują około 350 KRAB palców cynkowych. Dziedzina KRAB reprezentuje jedną z najmocniejszych dziedzin supresji pośród wszystkich znalezionych w organizmach ssaków. Wygenerowano antysera do licznych białek KRAB palców cynkowych, żeby rozróżnić ich funkcje biologiczne na podstawie poziomu ekspresji w tkankach zdrowych i rakowych. W ten sposób stworzono bazę do modelowania w ramach biologii systemowej. Za pomocą symulacji numerycznej badamy czasową ewolucję zbioru genów na podstawie pewnych założeń dotyczących interakcji między ich poziomami ekspresji. Przy identyfikacji modelu ważną rolę odgrywają metody klasyfikacji typu Maszyn Wektorów Podpierających.
Źródło:
Symulacja w Badaniach i Rozwoju; 2010, 1, 2; 131-137
2081-6154
Pojawia się w:
Symulacja w Badaniach i Rozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the critical success factors in the implementation of knowledge management using fuzzy ANP and fuzzy DEMATEL techniques. A case study of the Tehran fire department
Ocena krytycznych czynników sukcesu w realizacji zarządzania wiedzą z wykorzystaniem metod rozmytych ANP i DEMATEL. Studium przypadku: straż pożarna w Teheranie
Autorzy:
Afsari, M.
Vasigh, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/202785.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
KM
fuzzy DEMATEL
fuzzy ANP
Tehran Fire Department (TFD)
DEMATEL
ANP
Straż Pożarna w Teheranie
Opis:
Today, knowledge and information are considered as determining factors in the success and competitiveness of organizations. Products and services of those businesses that can efficiently obtain knowledge in organization and use it in business processes will have a competitive advantage on the market. In this study, the fuzzy DEMATEL technique was used to examine the causal relationships between factors affecting the implementation of knowledge management, and the fuzzy ANP technique was used to determine the priority of factors. The case study in this research is of the Tehran Fire Department (TFD). The results showed that during the implementation of the fuzzy DEMATEL method, "specified strategies and objectives in the use of knowledge management" was the most influential factor and the factor of "designing effective processes to apply KM" was the most impressible one. Finally, using fuzzy ANP, “strategies and specific objectives in the use of knowledge management” was determined as the most important factor.
Dziś wiedza i informacja są uważane za czynniki decydujące o sukcesie i konkurencyjności organizacji. Produkty i usługi firm, które mogą skutecznie zdobywać wiedzę w organizacji i wykorzystywać je w procesach biznesowych, będą miały przewagę konkurencyjną na rynku. W badaniu zastosowano techniki rozmyte DEMATEL w celu zbadania zależności przyczynowych między czynnikami wpływającymi na wdrożenie zarządzania wiedzą i techniki rozmytej ANP w celu określenia priorytetu czynników. Studium przypadku w tym badaniu jest Straż Pożarna w Teheranie. Wyniki wykazały, że w trakcie wdrażania metody rozmytej DEMATEL za najistotniejszy czynnik uznano "strategie i cele w zarządzaniu wiedzą", a czynnik "projektowanie skutecznych procesów stosujących KM" był najbardziej wrażliwy. Ostatecznie, przy użyciu metody rozmytej ANP, za najważniejszy uznano czynnik strategii i celów w zakresie zarządzania wiedzą.
Źródło:
Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie; 2017, 75; 7-24
0239-9415
Pojawia się w:
Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stop criteria for retransmission termination in soft-combining algorithms
Autorzy:
Zepernick, H.-J.
Caldera, M.
Powiązania:
https://bibliotekanauki.pl/articles/309572.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
MAP decoder
soft-combining
retransmission termination
cross-entropy
Opis:
Soft-combining algorithms use retransmissions of the same codeword to improve the reliability of communication over very noisy channels. In this paper, soft-outputs from a maximum a posteriori (MAP) decoder are used as a priori information for decoding of retransmitted codewords. As all received words may not need the same number of retransmissions to achieve satisfactory reliability, a stop criterion to terminate retransmissions needs to be identified. As a first and very simple stop criterion, we propose an algorithm which uses the sign of the soft-output at the MAP decoder. The performance obtained with this stop criterion is compared with the one assuming a genius observer, which identifies otherwise undetectable errors. Since this technique needs always a particular number of initial retransmissions, we exploit cross-entropy between subsequent retransmissions as a more advanced but still simple stop criterion. Simulation results show that significant performance improvement can be gained with soft-combining techniques compared to simple hard or soft decision decoding. It also shows that the examined stop criteria perform very close to the optimistic case of a genius observer.
Źródło:
Journal of Telecommunications and Information Technology; 2001, 3; 61-65
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The graduation tower of Bad Kösen (Germany) ‒ its history and the formation of thornstone
Autorzy:
Engelhardt, H. J.
Borstel, L.
Powiązania:
https://bibliotekanauki.pl/articles/2192121.pdf
Data publikacji:
2015
Wydawca:
Polskie Stowarzyszenie Górnictwa Solnego
Tematy:
brine
evaporation
graduation tower
gypsum
inhalation
thornstone
salt
solanka
tężnie
inhalacja
sól
Opis:
Graduation towers are wooden frameworks stuffed with blackthorn bundles. Brine is pumped to the top of the towers. Afterwards, the brine flows down on the bundles and drops are formed upon impact with the twigs and branches. The technique results in high evaporation rates due to the enormous surface of the drops, the high air velocity on the drop surfaces, and the dependence of the vapor pressure on the radius of a brine surface. Minerals precipitate as so-called thornstone. Gypsum crystals mostly radiate out from the twigs of the bundles and the surface of the thornstone is comparable with sandroses. A rounding of the crystals is caused by dissolution processes. Samples from the graduation tower in Bad Kösen, Germany, show that the thornstone contains layers of foreign particles, fine-grained carbonates, and sometimes traces of halite. Strontium illustrates that the brine could be evaporated until halite saturation. Due to its high efficiency, the technique made it possible to produce table and pickling salt during the 18th and 19th century, even from low-concentrated brines and under the climatic conditions in Austria, Germany, Poland, and Switzerland. Nowadays, graduation towers are centres of recreation in spa towns. The particle inclusions of the thornstone demonstrate the cleaning of the air. Water evaporation cools the air and the resulting microclimate with fresh, salty aerosols is used for therapeutic inhalations. The trickling of brine creates a relaxing atmosphere and the brines can be used for bath therapies. In addition, the towers are technical monuments, tourist attractions, and event locations. Visitors have the opportunity to learn principles of solution mining and salt processing.
Źródło:
Przegląd Solny; 2015, 11; 98--108
2300-9349
Pojawia się w:
Przegląd Solny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Kingmans integral inequalities for approximations of the waiting time distribution in the queuing model GI/G/1 with and without warming-up time
O nierównościach całkowych Kingmana aproksymujących rozkład czasu czekania w systemie obsługi masowej GI/G/1 z rozgrzewaniem i bez rozgrzewania
Autorzy:
Rossberg, H. J.
Siegel, G.
Powiązania:
https://bibliotekanauki.pl/articles/741012.pdf
Data publikacji:
1974
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Applicationes Mathematicae; 1974-1975, 14, 1; 27-30
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strength and Deformation of Sand-Tire Rubber Mixtures (STRM): An Experimental Study
Autorzy:
Al-Rkaby, Alaa H. J.
Powiązania:
https://bibliotekanauki.pl/articles/178850.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
tire rubber
shear strength
deformation
major principal strains
minor principal strains
intermediate principal strains
Opis:
Waste material such as used tires is increasing every year, which poses environmental problems. However, such material has been used in several geotechnical applications as alternative lightweight backfill in highway embankments and/or behind retaining walls, providing environmental, economic and technical benefits. These applications require knowledge of engineering properties of soil-tire rubber mixtures. The present study aims to show the possibility of tire rubber usage in sand by evaluating the shear strength and deformability of sand mixed with granulated rubber, in weight percentages between 0 and 50%. The tire rubber content was found to influence the stress-strain and deformation behavior of the mixtures. The shear strength of sand mixed with 10% or 20% tire rubber was higher than that measured for sand only. However, the trend for TRC = 30–50% was different. Samples with a rubber content of 30-50% exhibited a rapid decrease in the stress ratio compared with that of sand. The major principal strain at maximum stress ratio was found to increase with increasing tire rubber content. However, it was observed that the lateral strains (minor and intermediate principal strains) of samples reduced significantly with the addition of tire rubber to the sand.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 2; 74-80
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEV HiFORS: A new passenger car Diesel injector with continuous rate shaping for 2500 bar injection pressure
Autorzy:
Grzeschik, P.
Laumen, H.-J.
Powiązania:
https://bibliotekanauki.pl/articles/133128.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
diesel injection system
injection hydraulics
mixture formation
system wtryskowy
diesel
hydraulika wtrysku
Opis:
This paper presents the HiFORS continuously rate shaping injector for injection pressures of 2500 bar and above developed by FEVGmbH and the Institute for Combustion Engines, RWTH Aachen University. The development process from concept definition to hydraulic and deisgn layout, material choice and manufacturing is discussed. The hydraulic operating properties are verified by injection test rig investigations. Optical investigations are conducted in an optically accessible high pressure, high temperature chamber using shadowgraphy and OH chemoluminescence detection, thereby capturing both liquid and gaseous penetration as well as combustion areas. Single cylinder investigations are carried out at a 0.4 dm3 research engine in different operating points from low part load to full load. Compared to a serial production piezo injector, base measurements using conventional square injection profiles already show reduced combustion noise at improved NOx-soot trade-off as well as lowered HC and CO emissions. Detailed investigations at part load operating points explore the potential of different continuous rate shaping patterns, while the injector’s high injection pressure capability of up to 2500 bar and its influence on engine performance is tested at full load operation points.
Źródło:
Combustion Engines; 2014, 53, 2; 36-44
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On singular arcs in nonsmooth optimal control
Autorzy:
Oberle, H. J.
Rosendahl, R.
Powiązania:
https://bibliotekanauki.pl/articles/969559.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
nonsmooth optimal control problems
necessary conditions
singular state subarcs
Zermelo's problem
Opis:
In this paper we consider general optimal control problems (OCP) which are characterized by a nonsmooth ordinary state differential equation. However, we allow only mild types of nonsmoothness. More precisely, we assume that the right-hand side of the state equation is piecewise smooth and that the switching points, which separate these pieces, are determined as points, where a state-and possibly control-dependent (smooth) switching function changes sign. For this kind of optimal control problems necessary optimality conditions are developed. Attention is paid to the situation when the switching function vanishes identically along a nontrivial subarc. Such subarcs, which we call singular state subarcs, are investigated with respect to necessary conditions and to junction conditions. In extension to earlier results of the authors, Oberle and Rosendhal (2006), in this paper nonsmooth OCPs are considered with respect to the order of the switching function. Especially, the case of a zero-order switching function is included and examples of order zero, one and two are treated.
Źródło:
Control and Cybernetics; 2008, 37, 2; 429-450
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Maximum Principle of optimal control: A history of ingenious ideas and missed opportunities
Autorzy:
Pesch, H. J.
Plail, M.
Powiązania:
https://bibliotekanauki.pl/articles/970918.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
history of optimal control
maximum principle
Opis:
On the occasion of (more than) 50 years of optimal control theory, this paper deals with the development of the maximum principle of optimal control during the early times of the Cold War, when mathematicians in the US and the USSR made every endeavor to solve minimum time interception problems, which later on became prototypes of the first optimal control problems. The paper is a short survey on the history of optimal control, a sequence of ingenious ideas and regrets of missed opportunities. The conclusions of the paper are extracted from the second author's monograph on the development of optimal control theory from its commencements until it became an independent discipline in mathematics. The present paper also includes secondary literature published thereafter.
Źródło:
Control and Cybernetics; 2009, 38, 4A; 973-995
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wpływu wymuszenia posiłek - dawka insuliny na przebieg krzywych cukrowych komputerowych modeli pacjentów
Analysis of impact of meal insulin dose excitation on glucose traces in silico subjects
Autorzy:
Hawłas, H. J.
Lewenstein, K.
Powiązania:
https://bibliotekanauki.pl/articles/155850.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
hiperglikemia
krzywe cukrowe
model komputerowy pacjenta
hipoglikemia
sterowanie pompy insulinowej
glucose trace
hyperglycaemia
hypoglycaemia
in-silico model
insulin pump control
Opis:
Końcowym celem badań, których fragment zaprezentowano w niniejszej pracy jest opracowanie inteligentnego algorytmu pozwalającego na automatyczne sterowanie osobistą pompą insulinową na podstawie sygnałów otrzymywanych z urządzenia do ciągłego pomiaru stężenia glukozy. Wstępne badania przeprowadzone zostały w formule in silico czyli przy użyciu modelu komputerowego odzwierciedlającego funkcjonowanie żywego organizmu. W rozpatrywanym przypadku zastosowano model opracowany przez zespół dr. Boris Kovatchev'a z University of Virginia, USA. Analizowano przebiegi odpowiedzi modelu - krzywe cukrowe BG, na zmieniane wymuszenia w postaci zróżnicowanych posiłków i dawek insuliny. W efekcie stwierdzono silne zindywidualizowanie odpowiedzi a ponadto konkretny jakościowy wpływ czasu posiłku i wielkości dawki insuliny (w tym także podziału tej dawki na części), na możliwość utrzymania poziomu glukozy w przedziale pożądanym - pomiędzy 70mg/dl a 180 mg/dl, umożliwiające uniknięcie występowania groźnych dla pacjenta stanów hipoglikemi i hiperglikemi. Zakładamy, że otrzymane rezultaty pomogą przy późniejszym wdrażaniu gotowego systemu sterowania pompy insulinowej kontrolującego poziom stężenia glukozy we krwi chorego.
The material presented in this paper describes one of the steps in design of our control algorithm for Closed Loop Insulin Delivery. Such a system would consist of Insulin Pump with Continuous Glucose Monitoring Device and Control Algorithm. The presented work gives information about the qualitative influence of treatment parameters on blood glucose (BG) traces. The study utilises computer model tests (in-silico) for obtaining the BG level information. The great advantage of such computer tests is possi-bility to conduct several similar examinations leading to the family of traces that are different by a single parameter, while the other parameters are constant. The used computer simulator was delivered by the University of Virginia [3, 4]. Fig. 1 shows interspecies differences for subjects, which proves the need for control algorithm individualisation. Fig. 2 presents the impact of the bolus delivery time regarding the meal delivery time for an adult subject. Delivering the insulin in advance to meal reduces the BG. In Fig. 3 the influence of the meal duration time on the BG response is shown. Extending the meal duration slightly lowers the BG, but does not influence noticeably the fall ratio. Fig. 4 depicts the changes due to the bolus value, a higher bolus causes the lower BG and faster fall rate of change. Fig. 5 illustrates the test result of bolus distribution into 3 doses delivered within some period. Scheme 10/20/70 every 60min means that a single bolus is split into 10%, then 20% and 70% doses within the period of 60 minutes. There can be noted the response similarity between 10/20/70 every 15min and 70/20/10 every 60min, in spite of the fact that the drug delivery schemes are significantly different . This proves the possibility of long term BG regulation. None of the above tests show noticeable changes of the BG rise ratio, thus it cannot be easily controlled by insulin or meal delivery. The main purpose of the control algorithm isto avoid harmful extreme values of the BG. The presented study allows the better algorithm planning because the influence of a different type of meal and insulin scenario on the BG trace is known.
Źródło:
Pomiary Automatyka Kontrola; 2012, R. 58, nr 12, 12; 1124-1128
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineral preconcentration using near infrared sensor-based sorting
Autorzy:
Iyakwari, S.
Glass, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/109720.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
near infrared
copper
hematite
preconcentration
strategy
intimate mixtures
moisture
Opis:
This paper predicts qualitatively and quantitatively the near infrared activity of individual minerals in simple and complex mineral associations using mixtures of common alteration minerals found in a copper ore. It was found that spectra dominance in most cases is dependent on any or combination of mineral composition, relative proportion or concentration and/or mineral accessibility or sensitivity to near infrared radiation. The analysis of results also indicated that, in most cases, only freely occurring waste, such as clays (kaolinite and/or muscovite) and calcite, can be targeted for discrimination. In this paper, a strategy for the application of near infrared for preconcentration of copper bearing minerals like chrysocolla and malachite from coarse ore particles was proposed. Other applications also considered in this paper include preconcentration of hematite from associated clays and carbonate waste, and the determination of moisture content in kaolinitic clays.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 661-674
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Immobilization of rambutan (Nephelium lappaceum) peel as a sorbent for Basic Fuchsin removal
Autorzy:
Lee, H.-J.
Ong, S.-T.
Powiązania:
https://bibliotekanauki.pl/articles/207651.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fuchsin
Fourier transform infrared spectrophotometry
FTIR
Nephelium lappaceum
fuksyna
spektroskopia w podczerwieni z transformatą Fouriera
Opis:
The potential of rambutan (Nephelium lappaceum) peel as a low-cost adsorbent in an immobilized condition to remove Basic Fuchsin from aqueous solution was studied. The effect of initial dye concentration, contact time, pH and adsorbent dosage for the dye removal was studied at room temperature (26±2 °C). Infrared spectrum of rambutan peel indicates the presence of C–O, –OH and C=C functional groups. The adsorption rate was found to be high at the first 30 min and the process reached equilibrium after 3 h with more than 80% of dye being removed. The uptake of Basic Fuchsin was more promising at pH slightly above 7. The study of sorption model and kinetic model showed that the adsorption of Basic Fuchsin on rambutan peel conformed to the Freundlich isotherm and pseudo-second order kinetics with a high correlation coefficient, R,sup>2 > 0.98. This indicates the Basic Fuchsin adsorbs chemically on the heterogeneous surface of rambutan peel. The maximum adsorption capacity determined from the Langmuir isotherm was 108.696 mg/g. It seems that rambutan peel has the potential to substitute activated carbon as an alternative low-cost adsorbent in the treatment of the dye effluent.
Źródło:
Environment Protection Engineering; 2017, 43, 1; 169-181
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wiek izotopowy Re-Os siarczkowej mineralizacji Cu-Ag oraz jej charakterystyka mineralogiczna i geochemiczna z obszaru złożowego Lubin–Polkowice (SW Polska)
Re-Os isotopic age of the Cu-Ag sulphide ore and its mineralogical and geochemical characteristic from the Lubin–Polkowice mining area (SW Poland)
Autorzy:
Mikulski, S. Z.
Stein, H.J.
Powiązania:
https://bibliotekanauki.pl/articles/2061706.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
geochronologia Re-Os
bornit
chalkopiryt
łupek miedzionośny
Re-Os geochronology
bornite
chalcopyrite
Kupferschiefer
Opis:
W artykule przedstawiono wyniki badań izotopowych Re-Os oraz charakterystykę mineralogiczno-geochemiczną mineralizacji bornitowej i chalkopirytowej występujących w postaci żyłkowo-impregnacyjnej w czarnych łupkach miedzionośnych formacji cechsztyńskiej z obszaru złożowego Lubin i Polkowice. Zbadane próbki reprezentują rudę siarczkową Cu-Ag o zawartościach miedzi od ok. 2,5 do 14,2% ze zróżnicowaną domieszką Ag (40–900 ppm) oraz zawartością substancji organicznej na poziomie ok. 6%. Wartości stosunków chemicznych, takich jak: Co/Ni = 0,1–0,7, V/Cr = 4–17 czy Fe2O3/Corg. = 0,6–1,9 i in., są w zakresach typowych dla czarnych łupków miedzionośnych z formacji cechsztyńskiej. Oprócz siarczków miedzi, które zawierają stałą domieszkę Ag (np. chalkozyn – 0,44–5,03% wag., bornit – 0,33–0,77% wag., chalkopiryt 0,09–0,20% wag.), obecne są również podrzędnie galena, sfaleryt, minerały Ag oraz powszechnie piryt framboidalny. W zbadanych izotopowo próbkach bornitu i chalkopirytu, występujących w postaci żyłek zgodnych z laminacją w łupku, zmierzone zawartości renu wahają się od 5,7 do 12 ppb, a całkowita zawartość osmu – od 27 do 50 ppt. W siarczkach tych jest wysoki udział zwykłego osmu. Stosunki izotopowe: 187Re/188Os są bardzo wysokie, w zakresie od 2269 do 2942, a 187Os/188Os – od ok. 9,8 do ok. 12,4. Obliczony dla tych wartości wiek modelowy Re-Os krystalizacji siarczków miedzi mieści się w zakresie od 268 do 256 mln lat oraz dla jednej próbki żyłki chalkopirytowej – 217 ±2 mln lat. Biorąc pod uwagę wartości stosunków izotopowych 187Re/188Os, możliwe było wyliczenie czteropunktowej izochrony wieku modelowego Re-Os (wiek modelowy 1), który wyniósł 212 ±7 mln lat przy założeniu stosunku inicjalnego 187Os/188Os = 2,13 ±0,31 (MSWD = 1,3; n = 4). Uzyskany wiek modelowy 1 wskazuje na krystalizację bornitu i chalkopirytu, występujących w czarnych łupkach cechsztyńskich w postaci żyłek równoległych do laminacji, w późnym triasie (noryku).
In the paper we present the results of Re-Os isotopic studies as well as the mineralogical and geochemical characteristic of bornite veinlets with chalcopyrite ± chalcocite margins and chalcopyrite veinlets that are parallel to sub-parallel to bedding in the Kupferschiefer from the underground workings of the Lubin and Polkowice mines in SW Poland. Kupferschiefer samples are of grade from 2.5 to 14.2% Cu and with silver admixtures from 40 to 900 ppm and organic matter contents ca. 6%. The ratios of Co/Ni = 0.1–0.7, V/Cr = 4–17 and Fe2O3/Corg = 0.6–1.9 are in the range of values typical for the Kupferschiefer. Besides, copper sulphides, which commonly contain silver admixtures (e.g., chalcocite – 0.44–5.03 wt.%, bornite – 0.33–0.77 wt.%, chalcopyrite 0.09–0.20 wt.%) are associated with minor galena, sphalerite, Ag-minerals and common pyrite framboids. In the isotopically analysed bornite and chalcopyrite samples Re concentrations ranging from 5.7 to 12 ppb, and total Os concentrations ranging from 27 to 52 ppt. Significant common Os is present in all of the analysed sulphides. The isotopic ratios of 187Re/188Os are very high (range: 2269–2942), and of 187Os/188Os from 9.8 to ca. 12.4. Re-Os model ages calculated for these isotopic ratios are in the range from 256 to 268 Ma and for one of the chalcopyrite veinlet was 217 ±2 Ma. Taking into the account the values of the isotopic ratios of 187Re/188Os, it was possible to construct the Re-Os isochrone age for A Model 1regression based on four different samples. They yields age of 212 ±7 Ma, with an initial 187Os/188Os ratio of 2.13 ±0.31 (MSWD = 1.3). Re-Os isochrone age indicates for bornite and chalcopyrite crystallization event of the Ag-bearing Cu sulphide mineralization within the Kupferschiefer in the Late Triassic (Norian), ca. 212 ±7 Ma.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2017, 468; 79--96
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wiek molibdenitów w Polsce w świetle badań izotopowych Re-Os
The age of molybdenites in Poland in the light of Re-Os isotopic studies
Autorzy:
Mikulski, S.Z.
Stein, H.J.
Powiązania:
https://bibliotekanauki.pl/articles/2062033.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
wiek izotopowy Re–Os
molibdenit
procesy pomagmowe
granitoidy
waryscydy
Karkonosze
masyw Strzegom-Sobótka
Sudety
blok przedsudecki
blok małopolski
blok górnośląski
Tatry
Re-Os isotope age
molybdenite
post-magmatic processes
Variscides
granitoids
Karkonosze Massif
Strzegom-Sobótka Massif
Sudetes
Fore-Sudetic Block
Małopolska Block
Upper Silesian Block
Tatra Mts.
Opis:
W artykule przedstawiono wyniki datowań metodą Re–Os wieku molibdenitów związanych z waryscyjskimi intruzjami granitoidowymi w Polsce. W masywie karkonoskim oraz w jego wschodniej osłonie metamorficznej stwierdzono dwa etapy krystalizacji molibdenitów (od 326 ±1 do 310 ±1 mln lat), które odzwierciedlają aktywność pneumatolityczną i hydrotermalną w okresie karbońskim od wizenu/ serpuchowu do moskowu. W masywie Strzegom–Sobótka zarówno molibdenity rozetkowe występujące w formie impregnacji w granitach, jak i molibdenity w przecinających je żyłkach kwarcowych wykazują zbliżony wiek (od 309 ±1 do 296 ±2 mln lat). Krystalizacja molibdenitów w tym masywie była pochodną procesów pomagmowych związanych z powolnym stygnięciem magm odpowiedzialnych za powstanie monzogranitów hornblendowo-biotytowych. Zakres wiekowy krystalizacji molibdenitów ze strefy kontaktu bloku małopolskiego z blokiem górnośląskim mieści się w czasie od 301 ±2 do 296,3 ±1,4 mln lat. Najstarszy wiek izotopowy Re–Os krystalizacji wśród zbadanych dotychczas molibdenitów uzyskano dla próbki molibdenitu pochodzącej z Tatr – 350,5 ±1,2 mln lat. Z kolei najmłodsze wieki krystalizacji molibdenitów stwierdzono w próbkach z kamieniołomu w Siedlimowicach (257 ±1 mln lat) oraz w Miedziance (213 ±1 mln lat). Wieki te wskazują na procesy kataklazy i remobilizacji roztworów hydrotermalnych w młodszych okresach, tj. w późnym permie i triasie. Wyniki badań izotopowych molibdenitów pozwoliły określić relacje czasowe pomiędzy poszczególnymi hydrotermalnymi etapami krystalizacji kruszców i procesami magmowo-tektonicznymi w czasie ok. 140 mln lat, tj. od missisipu (karbon) do noryku (późny trias) w różnych obszarach wystąpień waryscyjskich intruzji granitoidowych w Polsce.
The paper presents the results of molybdenites that closely correlate with the Variscan granite intrusions in Poland. In the Karkonosze Massif and its eastern metamorphic cover, there are two separate stages of Re-Os ages of molybdenite crystallization (326 ±1 to 310 ±1 Ma), which reflect pneumatolitic and hydrothermal activity in the Carboniferous (from the Visean/Serpukhovian to the Moscovian). In the Strzegom–Sobótka Massif, both rosette-like molybdenites disseminated in granitoids and those from the quartz veinlets reveal similar Re-Os ages that range from 309 ±1 to 296 ±2 Ma. Molybdenite crystallization in the Strzegom–Sobótka Massif was related to the post-magmatic processes associated with a slow cooling of magma responsible for the formation of hornblende-biotite monzogranites. The time range of molybdenites crystallization form the contact zone between the Małopolska and Upper Silesian blocks is from 301 ±2 to 296.3 ±1.4 Ma. The oldest Re-Os isotopic age of molybdenite (350.5 ±1.2 Ma) was received for a molybdenite sample from the Polish part of the Tatra Mountains. The molybdenites from the eastern part of the Strzegom–Sobótka Massif (Siedlimowice quarry, 257 ±1 Ma) and from the Miedzianka abandoned Cu (-U) mine (213 ±1 Ma) yielded the youngest Re-Os ages. These ages indicate tectonic reactivation and remobilization of hydrothermal fluids in the Late Permian and Late Triassic. The Re-Os isotopic studies of molybdenites allowed defining the time relation between successive hydrothermal stages of ore precipitation and tectonic-magmatic processes during ca. 140 million years e.g. from the Mississippian (Carboniferous) to the Norian (Late Triassic) in different areas of the occurrence of Variscan granitoid intrusions in Poland.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2012, 452; 199--216
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of the indoor radio propagation channel at 2.4 GHz
Autorzy:
Wysocki, T. A.
Zepernick, H.-J.
Powiązania:
https://bibliotekanauki.pl/articles/309221.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
indoor radiocommunication
microwave propagation
fading channels
jamming
Opis:
The unlicensed industrial, scientific, and medical (ISM) band at 2.4 GHz has gained increased attention recently due to the high data rate communication systems developed to operate in this band. The paper presents measurement results of fading characteristics, multipath parameters and background interference for these frequencies. Some statistical analysis of the measured data is presented. The paper provides information that may be useful in design and deployment of communication systems operating in the 2.4 GHz ISM band, like those compilant with IEEE 802.11 standard and Bluetooth open wireless standard.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 3-4; 84-90
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication of Porous Silica Fibers by Electrospinning for Sound Absorbing Materials
Autorzy:
Cho, Y.-S.
Lee, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/353561.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrospinning
porous silica fiber
thermal insulator
sound absorption
Opis:
Macroporous silica fibers having spherical cavities were fabricated by electrospinning using the spinning solution prepared from the mixed dispersion of tetraethylorthosilicate (TEOS) and polystyrene nanospheres as precursor and sacrificial templates, respectively, by injection through metallic nozzle. By applying electric field, the electro-spun fibers obtained by evaporation-driven self-assembly were collected on flat substrate or rotating drum, followed by the removal of the templates by calcination. The sound absorption coefficient of the porous fibers was measured by impedance tube, and the measured value was larger than 0.9 at high frequency region of incident waves. The surface of the resulting fibers was modified using fluorine-containing silane coupling agent to produce superhydrophobic fibrous materials to prevent the infiltration of humidity.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1497-1502
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A static test-bed for the evaluation and optimization of multihop wireless network protocols
Autorzy:
Bongartz, H. H.-J.
Bachran, T.
Powiązania:
https://bibliotekanauki.pl/articles/308216.pdf
Data publikacji:
2008
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
MANET
mobile ad hoc network
multihop wireless network
multicast
wireless test-bed
simulation
explicit multicast
Opis:
We investigate the performance of multicast transmissions in a simple stationary wireless multihop ad hoc network test-bed. We compare several methods for MANET multicast using implementations for the protocols MOLSR, SMOLSR and SMF with an approach that uses explicit multicast and link-layer retries for reliable multicast. Results from the test-bed are compared with simulation results. We find that implementing a combination of explicit multicast with a retry mechanism gives the most promising results in test-bed and simulation compared with other approaches.
Źródło:
Journal of Telecommunications and Information Technology; 2008, 2; 62-69
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factor Analysis of Safety for Visitors to a Mega-Event
Autorzy:
Kwon, Y. G.
Park, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/90888.pdf
Data publikacji:
2002
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
factor analysis
safety
mega-event
event tourism
czynniki bezpieczeństwa
bezpieczeństwo uczestników imprez
turystyka
Opis:
This paper investigated the safety factors considered by visitors to the Kwangju Biennale 2000 and analyzed the correlation between the safety factors and the demographic characteristics of the visitors. Global tourism increased throughout the 1990s, with the biggest surge occurring in the Asia-Pacific region. Long-distance travel is also increasing, and at a rate faster than the global average. The opportunities for event tourism appear to be strong almost everywhere, even though recessions may have an impact on these destinations. Along with this upward trend, competition for more desirable tourists is also surging (Getz, 1997). Therefore event tourism is appearing as a powerful method in the fierce competition around the tourism industry.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2002, 8, 3; 365-375
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boundary element modelling of wave diffraction by interaction with wave-offshore structure and dredged region
Autorzy:
Kim, S. D.
Lee, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/259525.pdf
Data publikacji:
2010
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Submarine pit
Green function
boundary integral approach
breakwater
Opis:
The purpose of this study is to estimate the wave height at the front face of breakwater (Refracted breakwater and Straight breakwater), when dredging like the submarine pit is performed in the distant offshore from outer breakwater. The wave field of the problem is considered to be two dimensional planes and the configuration of the pit region is designated by a single horizontal long-rectangular system. The numerical approach uses the Green function based on the boundary integral approach. The results of the present numerical works are illustrated by applying the normal and inclined incidence. It is shown that in the case of normal incidence, the ratio of wave height reduction at the front face of both types of breakwaters is approximately more than 20% due to the effect of the submarine pit on the sea bed. Furthermore, regardless of the type of breakwater and the difference in incident wave angles, the ratio of wave height was shown to be reduced.
Źródło:
Polish Maritime Research; 2010, 2; 67-71
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Polarized Scanning Tunnelling Microscopy of Ultrathin Films
Autorzy:
Kukunin, A.
Prokop, J.
Elmers, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/2044708.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.+a
68.37.Ef
81.15.-z
Opis:
Using low temperature spin-polarized scanning tunneling microscopy we have studied the morphology and magnetic properties of ultrathin Fe(0.5 ML)Au(0.5 ML) nanowires prepared on a Mo(110) single crystal. The Fe nanostripes grown by step flow on a Mo(110) at 700 K were covered by Au at RT, and subsequently annealed at 700 K. Differences in the morphology of Au on Fe(110)/Mo(110) and clean Mo(110) surfaces are observed and discussed. After annealing, the Mo is covered by a homogeneous FeAu ML alloy with several iron enriched islands which reveal an out-of-plane magnetic contrast. Direct lateral exchange coupling has been observed for these islands.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 371-375
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion behaviour of selected power plant materials under oxyfuel combustion conditions
Korozja wybranych materiałów wykorzystywanych w elektrowniach przy spalaniu paliwa o dużej koncentracji tlenu
Autorzy:
Abang, R.
Findeisen, A.
Krautz, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/348867.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
technologia CCS
przetwarzanie paliw o dużej koncentracji tlenu
korozja
materiały
elektrownia
CCS technology
oxyfuel process
corrosion
materials
power plant
Opis:
To reduce the production of anthropogenic CO2 emissions, two lines of research are being investigated for fossil fuel-fired power plants, especially for those fired with lignite. One line concentrates on increasing efficiency in conventional power plant units (e.g. 700 degrees of Celsius technology, coal drying) while the other concentrates on the implementation of CO2 - reducing technologies including pre-combustion, post-combustion and oxyfuel technology. The standard low Nox-producing operation of large and modern lignite-fired power plants as well as the altered process conditions that occur when oxyfuel technology is implemented results in combustion conditions that cause damage to system components. Therefore, the corrosion of plant components as a result of contact with flue gas plays a particularly significant role. Within the framework of a BMBF-funded project investigations focussing on the corrosion behaviour of selected plant materials under conventional air and oxyfuel combustion conditions are being evaluated. These investigations were carried out in a 500 kWth test facility over a timeframe of 110 hours and initial corrosion occured. The corroded probes are then placed for a further 1.000 hours in a laboratory test rig at the BTU Cottbus, Chair of Power Plant Technology. The material probes investigated were: 16Mo3, 13CrMo4-5, 7CrVTiB10-10, 10CrMo9-10 and VM12SHC. Subsequently, the probes are analysed with the help of light and scanning electron microscopes. From the results of the investigations, conclusions on the corrosion behaviour of materials and altered process conditions can be reached, which also demonstrates the need for further investigations to be carried out in this area.
W celu zmniejszenia emisji antropogenicznego CO2 badane są dwie linie rozwoju elektrowni opalanych paliwem kopalnianym, szczególnie elektrowni opalanych węglem brunatnym. Jedna linia skupia się na zwiększeniu wydajności konwencjonalnych elektrowni (np. technologia 700 stopni Celsjusza, suszenie węgla), a druga linia koncentruje się na wdrożeniu technologii zmniejszających emisję CO2, np. separacja CO2 przed procesem spalenia, usunięcie CO2 po procesie spalania i technologia paliw o dużej koncentracji tlenu. Standardowe funkcjonowanie dużych i nowoczesnych elektrowni opalanych węglem brunatnym generujące niski poziom Nox, jak również zmienione warunki procesowe występujące po wdrożeniu technologii paliw o dużej koncentracji tlenu powodują stany spalania uszkadzające komponenty. Zatem korozja komponentów elektrowni w wyniku kontaktu z gazem spalinowym odgrywa szczególnie znaczącą rolę. W ramach projektu finansowanego przez BMBF przeprowadzane są badania skupiające się na występowaniu korozji wybranych materiałów używanych w elektrowniach w warunkach konwencjonalnych i opalania paliwem o dużej koncentracji tlenu. Badania te są przeprowadzane w obiekcie testowym w czasie 110 godzin. Występuje początkowa korozja. Skorodowane próbniki są następnie umieszczane na następnych 1000 godzin w laboratoryjnym urządzeniu badawczym w PB Chociebuż, Katedra Technologii Wytwarzania Energii. W szczególności brane są pod uwagę materiały 16Mo3; 13CrMo4-5; 7CrVTiB10-10; 10CrMo9-10 i VM12SHC. Następnie próbniki materiałów są oceniane przy pomocy mikroskopów świetlnych i elektronowych rastrowych. Z wyników badań można wyciągnąć wnioski dotyczące występowania korozji materiałów i zmienionych warunków procesowych, co także wskazuje na potrzebę przeprowadzenia dalszych badań w tym zakresie.
Źródło:
Górnictwo i Geoinżynieria; 2011, 35, 3/1; 23-42
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonance Raman Investigations of Low Energetic Modes in the Organic Superconductors α$\text{}_{t}$-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ and β-(BEDT-TTF)$\text{}_{2}$IAuI
Autorzy:
Ludwig, T.
Schweitzer, D.
Keller, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/1933367.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.-j
74.70.Kn
Opis:
A study of low energetic modes in the resonance Raman spectra of the organic superconductors α$\text{}_{t}$-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ (T$\text{}_{c}$ = 8 K) and β-(BEDT-TTF)$\text{}_{2}$IAuI (T$\text{}_{c}$ = 4 K) in the temperature range of 1.5-100 K was performed. In both materials, a strong vanishing of low energetic phonon bands (at 30 cm$\text{}^{-1}$ and 40 cm$\text{}^{-1}$ for α$\text{}_{t}$-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ and at 27 cm$\text{}^{-1}$ and 33 cm$\text{}^{-1}$ for β-(BEDT-TTF)$\text{}_{2}$IAuI) below 71 was observed. For the symmetric stretching mode of the I¯$\text{}_{3}$ and the IAuI¯ anion at 120 cm$\text{}^{-1}$ no change below T, was found. In addition, wavelength dependent measurements on α-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ were performed, indicating that the modes around 30 cm$\text{}^{-1}$ are probably librational modes of the BEDT-TTF molecules.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 801-806
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Image Processing to Predict Compressive Behavior of Aluminum Foam
Autorzy:
Kim, S.
Chung, H. J.
Rhee, K.
Powiązania:
https://bibliotekanauki.pl/articles/357032.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum foam
compute tomography (CT) image
finite element method (FEM)
Opis:
An image processing technique was used to model the internal structure of aluminum foam in finite element analysis in order to predict the compressive behavior of the material. Finite element analysis and experimental tests were performed on aluminum foam with densities of 0.2, 0.25, and 0.3 g/cm3. It was found that although the compressive strength predicted from the finite element analysis was higher than that determined experimentally, the predicted compressive stress-strain curves exhibited a tendency similar to those determined from experiments for both densities. However, the behavior of the predicted compressive stress-strain curves was different from the experimental one as the applied strain increased. The difference between predicted and experimental stress-strain curves in a high strain range was due to contact between broken aluminum foam walls by the large deformation.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 635-640
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Suszenie Parą w Złożu Fluidalnym pod Ciśnieniem (SPZFC) i oddzielanie dwutlenku węgla przez płuczkę gazową - nowe wyzwanie dla wytwarzania energii elektrycznej z węgla brunatnego
Pressurized Steam Fluidized Bed Drying (PSFBD) and carbon dioxide separation by flue gas scrubbing - new challenges for the lignite power industry
Autorzy:
Lechner, S.
Rombrecht, H.-B.
Krautz, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/348991.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
płuczka CO2
węgiel brunatny
suszenie
złoże fluidalne
elektrownia
lignite
drying
fluidized bed
carbon dioxide scrubbing
power plant
Opis:
Ochrona klimatu wymaga oddzielania i usuwania dwutlenku węgla pochodzącego ze spalin elektrowni opalanych węglem brunatnym. Jedną z możliwości osiągnięcia tego celu jest płukanie spalin. Proces ten wymaga dużo energii i pary o ciśnieniu około 4 bar. Jedną z możliwości obniżenia emisji dwutlenku węgla i powiększenia sprawności elektrowni jest wstępne suszenie węgla brunatnego. Aktualne badania dotyczą Suszenia Parą w Złożu Fluidalnym pod Ciśnieniem (SPZFC). Wzrost ciśnienia zmniejsza rozmiar suszarki, a para pochodząca z węgla brunatnego jest odprowadzana w obszarze temperatury od 140 do 160 stopni Celsjusza. Zadaniem pozostaje jeszcze włączenie tego ciepła do procesu. Poprzez połączenie suszenia i płukania spalin całe ciepło suszenia może być podane do płuczki spalin, gdzie pokryje około 40% popytu ciepła desorpcji. W ten sposób potrzebna ilość ciepła, pobrana z turbiny średnioprężnej zostaje wyraźnie zredukowana na rzecz optymalizacji sprawności bloku elektrowni. Artykuł przedstawia najpierw pogląd na temat stanu badań SPZFC, omawia stan aktualny technologii płuczkowej CO2 i w końcu dyskutuje sposoby wykorzystania ciepła suszarki w urządzeniu desorpcyjnym oczyszczania gazów spalinowych.
The protection of the climate requires the separation and discharge of carbon dioxide proceeding from lignite fired power plants. One measure to achieve this objective is the scrubbing of the flue gas. This process demands a high energy input in form of heating steam of a pressure of ca. 4 bar. A further measure to decrease the carbon dioxide emissions and increase the profitability of the power plant is the predrying of the lignite. A recent process is the Pressurized Steam Fluidized Bed Drying (PSFBD). Due to the high pressure the equipment is smaller than in atmospheric dryers and the steam coming from lignite water has a temperature range between 140 and 160 degrees of Celsius. The integration of this heat in the power plant process is a task still to solve. The combination of drying and gas scrubbing allows the use of the entire heat coming from the dryer in the gas scrubber where nearly 40% of the heat demand in the desorber can be substituted. By this means the necessary heat which has to be got after the intermediate steam turbine is significantly reduced. The overall power plant efficiency rises. The paper gives an overview about the state of the PSFBD-research and discusses possibilities of the use of the this heat in the desorber of a flue gas scrubber.
Źródło:
Górnictwo i Geoinżynieria; 2011, 35, 3; 203-215
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistics of Conductance and Shot-Noise Power for Chaotic Cavities
Autorzy:
Sommers, H.-J.
Wieczorek, W.
Savin, D. V.
Powiązania:
https://bibliotekanauki.pl/articles/2047832.pdf
Data publikacji:
2007-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
73.50.Td
05.45.Mt
73.63.Kv
Opis:
We report on an analytical study of the statistics of conductance, g, and shot-noise power, p, for a chaotic cavity with arbitrary numbers N$\text{}_{1,2}$ of channels in two leads and symmetry parameterβ = 1, 2, 4. With the theory of Selberg's integral the first four cumulants of g and first two cumulants of p are calculated explicitly. We give analytical expressions for the conductance and shot-noise distributions and determine their exact asymptotics near the edges up to linear order in distances from the edges. For 0 < g < 1 a power law for the conductance distribution is exact. All results are also consistent with numerical simulations.
Źródło:
Acta Physica Polonica A; 2007, 112, 4; 691-697
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A broadband uniplanar quasi-Yagi antenna - parameter study in application to a spatial power combiner
Autorzy:
Białkowski, M.E.
Song, H.J.
Kabacik, P.
Powiązania:
https://bibliotekanauki.pl/articles/309150.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
broadband quasi-Yagi antenna
passive spatial power combiner
Opis:
A parameter study is performed of a broadband uniolanar quasi-Yagi antenna with regard to its design and use in a spatial power combiner. A 3D full-wave electromagnetic field analysis is applied to identify parameters, which mostly affect the design frequency and operational handwidth of this antenna. Optimal design conditions are determined. Using these design criteria a passive spatial power combiner employing trays of back-to-back connected quasi-Yagi antennas is developed. This combiner is investigated in terms of insertion losses and field uniformity, which are key factors in obtaining high power combining efficiency.
Źródło:
Journal of Telecommunications and Information Technology; 2001, 4; 41-47
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Związek między pięcioma formami krzywdzenia dzieci a zaburzeniami depresyjnymi i lękowymi: przegląd systematyczny i metaanaliza
THE A SSOCIATION BETWEEN FIVE FORMS OF CHILD MALTREATMENT AND DEPRESSIVE AND ANXIETY DISORDERS: A SYSTEMATIC REVIEW AND META-ANALYSIS
Autorzy:
Gardner, M. J.
Thomas, H. J.
Erskine, H. E.
Powiązania:
https://bibliotekanauki.pl/articles/499216.pdf
Data publikacji:
2019
Wydawca:
Fundacja Dajemy Dzieciom Siłę
Tematy:
krzywdzenie dzieci
przemoc wobec dzieci
zaburzenia depresyjne
zaburzenia lękowe zespołu stresu pourazowego
wyniki
child maltreatment
child abuse
depressive disorders
anxiety disorders posttraumatic stress disorder
outcomes
Opis:
Kontekst: Krzywdzenie dzieci to globalny problem zdrowia publicznego, który obejmuje przemoc fizyczną, seksualną, emocjonalną, zaniedbanie i bycie świadkiem przemocy domowej. Niniejszy przegląd systematyczny i metaanaliza podsumowuje związek między tymi pięcioma formami krzywdzenia dzieci a zaburzeniami depresyjnymi i lękowymi. Metodologia: W analizie uwzględniono opublikowane badania kohortowe i badania kliniczno-kontrolne, w których zaobserwowano związek między jakąkolwiek formą krzywdzenia dzieci (lub ich połączenie) a zaburzeniami depresyjnymi i lękowymi. Łącznie pod względem kwalifikowalności oceniono 604 badań, z których 106 spełniło kryteria włączenia, a 96 uwzględniono w metaanalizach. Dane zebrano w metaanalizach efektów losowych, podając iloraz szans (OR) z odpowiadającymi 95% przedziałami ufności (CI) dla każdej formy krzywdzenia dziecka. Wyniki: Wszystkie formy krzywdzenia dzieci były związane z zaburzeniami depresyjnymi („jakiekolwiek krzywdzenie dziecka” [OR = 2,48, 2,14–2,87]; wykorzystywanie seksualne [OR = 2,11, 1,83–2,44]; przemoc fizyczna [OR = 1,78, 1,57–2,01]; przemoc emocjonalna [OR = 2,35; 1,74–3,18]; zaniedbanie [OR = 1,65; 1,35–2,02]; oraz bycie świadkiem przemocy domowej [OR = 1,68; 1,34–2,10]). Niektóre formy krzywdzenia dzieci były istotnie związane z zaburzeniami lękowymi („jakiekolwiek krzywdzenie dziecka” [OR = 1,68, 1,33–2,4]; wykorzystywanie seksualne [OR = 1,90, 1,6–2,25]; przemoc fizyczna [OR = 1,56, 1,39–1,76] i zaniedbanie [OR = 1,34, 1,09–1,65]). Istotne statystycznie związki stwierdzono również między kilkoma formami krzywdzenia dzieci a zespołem stresu pourazowego. Wnioski: Istnieje silny związek między pięcioma formami krzywdzenia dzieci a rozwojem zaburzeń psychicznych. Badanie Global Burden of Disease Study (GBD) obejmuje jedynie wykorzystywanie seksualne jako czynnik ryzyka zaburzeń depresyjnych i lękowych. Te ustalenia badawcze wspierają włączenie dodatkowych form krzywdzenia dzieci jako czynników ryzyka w GBD.
Background: Child maltreatment is a global public health issue that encompasses physical abuse, sexual abuse, emotional abuse, neglect, and exposure to intimate partner violence (IPV). This systematic review and meta-analysis summarises the association between these five forms of child maltreatment and depressive and anxiety disorders. Methods: Published cohort and case-control studies were included if they reported associations between any form of child maltreatment (and/or a combination of), and depressive and anxiety disorders. A total of 604 studies were assessed for eligibility, 106 met inclusion criteria, and 96 were included in meta-analyses. The data were pooled in random effects meta-analyses, giving odds ratios (ORs) with corresponding 95% confidence intervals (CIs) for each form of child maltreatment. Results: All forms of child maltreatment were associated with depressive disorders (any child maltreatment [OR = 2.48, 2.14–2.87]; sexual abuse [OR = 2.11, 1.83– 2.44]; physical abuse [OR = 1.78, 1.57–2.01]; emotional abuse [OR = 2.35, 1.74– 3.18]; neglect [OR = 1.65, 1.35–2.02]; and exposure to IPV [OR = 1.68, 1.34–2.10]). Several forms of child maltreatment were significantly associated with anxiety disorders (‘any child maltreatment’ [OR = 1.68, 1.33–2.4]; sexual abuse [OR = 1.90, 1.6– 2.25]; physical abuse [OR = 1.56, 1.39–1.76]; and neglect [OR = 1.34, 1.09–1.65]). Significant associations were also found between several forms of child maltreatment and post-traumatic stress disorder (PTSD). Conclusions: There is a robust association between five forms of child maltreatment and the development of mental disorders. The Global Burden of Disease Study (GBD)
Źródło:
Dziecko krzywdzone. Teoria, badania, praktyka; 2019, 18, 3; 117-156
1644-6526
Pojawia się w:
Dziecko krzywdzone. Teoria, badania, praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The RWE Power WTA process (Fluidized bed drying) as a key for higher efficiency
Proces WTA (suszenie fluidyzacyjne) w firmie RWE Power jako kluczowy czynnik zwiększający wydajność
Autorzy:
Klutz, H.-J.
Moser, C.
Bargen, N. von
Powiązania:
https://bibliotekanauki.pl/articles/348977.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
suszenie fluidyzacyjne
węgiel brunatny
suszenie parą
odzysk ciepła
WTA
suszenie fluidyzacyjne z wewnętrzną utylizacją ciepła odpadowego
fluidized bed drying
lignite
steam drying
waste heat utilization
Opis:
RWE is a large utility company focused on Germany and Europe. About 10,000 MW of the generating capacity is based on lignite which is mined in three large open cast mines in the Rheinland. This lignite with a heat content of around 9000 to 10000 KJ/kg has a moisture content of about 55%. This high moisture content needs to be removed prior to any further utilisation. It is also responsible for a relatively high specific CO2 emission. RWE Power has developed the WTA Process (Fluidized bed drying with internal waste heat utilisation) which offers important advantages in comparison against the conventional drying technologies: much better thermal efficiency, less CO2 emissions, much better flexibility, chance for water recovery and lower costs. The principle method of this process is the drying of lignite in a drying chamber in a fluidized bed heated with low pressure steam of about 4 bar and recovering of the energy content in the vapour. This technology will be used to dry the raw lignite for the new proposed 1000 MW thermal units and thus increase efficiency of the entire power station by about 4 to 6% points. This will result in a CO2 reduction of about 500 000 tonnes per 1000 MW unit per year. At the site of the BOA unit at Niederaussem a large scale prototype plant with a throughput capacity of 210 tonnes per hour (100 tph of evaporation capacity) was built and is now in its trial period. First operational results will be shown.
RWE to olbrzymia spółka energetyczna działająca na terytorium Niemiec i Europy. Jej moc wynosi około 10 000 MW, a cała energia pozyskiwana jest z węgla brunatnego wydobywanego w trzech, ogromnych kopalniach odkrywkowych w Nadrenii. Węgiel brunatny o entalpii wynoszącej od 9 000 do 10 000 KJ/kg charakteryzuje się wilgotnością na poziomie około 55%. Wysoka zawartość wilgoci musi być usunięta przed dalszym wykorzystaniem surowca. Węgiel brunatny odpowiedzialny jest także za relatywnie wysoką emisję CO2. RWE Power opracowała proces WTA (suszenie fluidyzacyjne z wewnętrzną utylizacją ciepła odpadowego), który jest dużo skuteczniejszy w porównaniu z konwencjonalnymi technologiami suszenia oraz zapewnia dużo lepszą wydajność cieplną, mniejsze emisje CO2, dużo większą elastyczność, możliwość odzyskania wody oraz niższe koszty. Proces ten polega na suszeniu węgla brunatnego w komorze suszącej z wykorzystaniem łoża fluidyzacyjnego ogrzewanego parą o niskiej energii i temperaturze około 160 stopni Celsjusza, a następnie odzyskiwaniu energii zawartej w oparach. Technologia ta będzie wykorzystywana do suszenia nierafinowanego węgla brunatnego w nowych jednostkach generujących ciepło o mocy 1 000 MW, a tym samym pozwoli zwiększyć wydajność całej elektrowni o około 4 do 6 punktów procentowych. Umożliwi to także zredukowanie emisji CO2 o około 500 000 ton na każdą jednostkę 1 000 MW rocznie. Na terenie jednostki BOA w Niederaussem wybudowany został prototyp elektrowni w dużej skali o wydajności 210 ton na godzinę (100 ton na godzinę wydajności parowania). Aktualnie jednostka ta przechodzi wszystkie testy. Pierwsze rezultaty zostaną zaprezentowane.
Źródło:
Górnictwo i Geoinżynieria; 2011, 35, 3; 147-153
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Copper Doped Neodymium Nickelate Oxide as Cathode Material for Solid Oxide Fuel Cells
Autorzy:
Lee, K. J.
Choe, Y-J.
Hwang, H-J.
Powiązania:
https://bibliotekanauki.pl/articles/351292.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solid oxide fuel cells
copper
electrical conductivity
excess oxygen
Opis:
Mixed ionic and electronic conducting K2NiF4-type oxide, Nd2Ni1-xCuxO4+δ (x=0~1) powders were synthesized by solid state reaction technique and solid oxide fuel cells consisting of a Nd2Ni1-xCuxO4+δ cathode, a Ni-YSZ anode and ScSZ as an electrolyte were fabricated. The effect of copper substitution for nickel on the electrical and electrochemical properties was examined. Small amount of copper doping (x=0.2) resulted in the increased electrical conductivity and decreased polarization resistance. It appears that this phenomenon was associated with the high mean valence of nickel and copper and the resulting excess oxygen (δ). It was found that power densities of the cell with the Nd2Ni1-xCuxO4+δ (x=0.1 and 0.2) cathode were higher than that of the cell with theNd2NiO4+δ cathode.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 625-628
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Čerenkov Waveguide SHG: a Less Critical Way to Reach the Efficiency Peak
Autorzy:
Kotačka, L.
Čtyroký, J.
Hoekstra, H. J. W. M.
Powiązania:
https://bibliotekanauki.pl/articles/2015113.pdf
Data publikacji:
2001-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Ky
42.82.Et
Opis:
It is well known that the conversion efficiency of the SHG in the Čerenkov regime in a waveguide with a nonlinear substrate exhibits a very sharp peak. Its position in a "pump wavelength-guide thickness" diagram follows a modified dispersion relation. A particular material combination exactly determines both the pump wavelength and the guide thickness. The existence of the peak was also experimentally proved with relatively high normalised conversion efficiency of 210%/(cm W). However, in order to achieve such a high conversion efficiency, the required tolerance in the guide thickness should be smaller than 0.5 nm (the FWHM of the peak is approximately 0.8 nm). The allowed variations in refractive indices are also very low (<10$\text{}^{-3}$). The recent theoretical study of the authors showed that an additional layer (idler) inserted into the waveguide facilitates more degrees of freedom which could relax the conditions for reaching the efficiency peak. This paper presents a detailed study of the behaviour of four-layer waveguide devices with a nonlinear substrate which promise a less constrained way to reach the efficiency peak.
Źródło:
Acta Physica Polonica A; 2001, 99, 1; 135-146
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved Long-Term Stability of Transparent Conducting Electrodes Based on Double-Laminated Electrosprayed Antimony Tin Oxides and Ag Nanowires
Autorzy:
Koo, B.-R.
Bae, J.-W.
Ahn, H.-J.
Powiązania:
https://bibliotekanauki.pl/articles/355292.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transparent conducting electrodes
Ag nanwories
antimony tin oxides
long-term stability
Opis:
We fabricated double-laminated antimony tin oxide/Ag nanowire electrodes by spin-coating and electrospraying. Compared to pure Ag nanowire electrodes and single-laminated antimony tin oxide/Ag nanowire electrodes, the double-laminated antimony tin oxide/Ag nanowire electrodes had superior transparent conducting electrode performances with sheet resistance ~19.8 Ω/□ and optical transmittance ~81.9%; this was due to uniform distribution of the connected Ag nanowires because of double lamination of the metallic Ag nanowires without Ag aggregation despite subsequent microwave heating at 250°C. They also exhibited excellent and superior long-term chemical and thermal stabilities and adhesion to substrate because double-laminated antimony tin oxide thin films act as the protective layers between Ag nanowires, blocking Ag atoms penetration.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1275-1279
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design method of winch driven by contactless magnetic coupling under deepwater
Autorzy:
Zhang, B.
Wang, Z.
Wang, T.
Yu, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/258870.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
magnetic coupling
winch
graph analysis
CAD
Opis:
Through the combination subject of scientific research, the design method of the winch driven by contactless magnetic coupling is researched for the core purpose of the turning shaft sealing in a deepwater environment. This method has six design phases, including domestic and foreign information query and retrieval, graphic analyses of relevant structures, innovative design of 2D assembly sketches, a theoretical computation of structure parameters, the 3D modeling and motion simulation and engineering drawing. This method is of generality, which can provide examples for the postgraduate students and engineering personnel in self-renovation design of scientific research.
Źródło:
Polish Maritime Research; 2015, S 1; 95-99
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation Functions of Impedance and Scattering Matrix Elements in Chaotic Absorbing Cavities
Autorzy:
Savin, D. V.
Fyodorov, Y. V.
Sommers, H.-J.
Powiązania:
https://bibliotekanauki.pl/articles/2044586.pdf
Data publikacji:
2006-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Mt
24.60.-k
42.25.Bs
03.65.Nk
Opis:
Wave scattering in chaotic systems with a uniform energy loss (absorption) is considered. Within the random matrix approach we calculate exactly the energy correlation functions of different matrix elements of impedance or scattering matrices for systems with preserved or broken time-reversal symmetry. The obtained results are valid at any number of arbitrary open scattering channels and arbitrary absorption. Elastic enhancement factors (defined through the ratio of the corresponding variance in reflection to that in transmission) are also discussed.
Źródło:
Acta Physica Polonica A; 2006, 109, 1; 53-64
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigated Serious Occupational Accidents in The Netherlands, 1998–2009
Autorzy:
Bellamy, L. J.
Manuel, H. J.
Oh, J. I. H.
Powiązania:
https://bibliotekanauki.pl/articles/89719.pdf
Data publikacji:
2014
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
accident analysis
trends
safety barriers
wypadki przy pracy
Holandia
badanie wypadków
bariery bezpieczeństwa
Opis:
Since 2003, a project has been underway to analyse the most serious occupational accidents in The Netherlands.All the serious occupational accidents investigated by the Dutch Labour Inspectorate for the 12 years of 1998−2009 inclusive have been entered into a database, a total of 20 030 investigations. This database uses a model of safety barriers supported by barrier tasks and management delivery systems such that, when combined with sector and year information, trends in the data can be analysed for their underlying causes. The trend analyses show that while the number of victims of serious reportable accidents is significantly decreasing, this is due to specific sectors, hazards and underlying causes. The significant results could not easily be directly associated with any specific regulation or action undertaken in The Netherlands although there have been many different approaches to reducing accidents during the period analysed, which could be contributing to the effect.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2014, 20, 1; 19-32
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cr Poisoning On Nd2Ni0.95Cu0.05O4+δ Cathode for Solid Oxide Fuel Cells
Autorzy:
Choe, Y-J.
Lee, K. J.
Hwang, H-J.
Powiązania:
https://bibliotekanauki.pl/articles/354728.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chromium poisoning
Ruddlesden-Popper
layered perovskite
solid oxide fuel cells
Nd2NiO4
Opis:
In this study, Nd2Ni1-xCuxO4+δ (x=0, 0.05, 0.1, and 0.2) layered perovskite powders were synthesized by the glycine nitrate process (GNP) and the chromium poisoning effect on the electrochemical performance of the Nd2Ni0.95Cu0.05O4+δ and La0.6Sr0.4Co0.2Fe0.88O3-δ cathodes were investigated. In the case of the LSCF cathode, the strontium chromite phase formed after the exposure of the gaseous chromium species, while there was no additional phase in the Nd2Ni0.95Cu0.05O4+δ cathode. The area specific resistance (ASR) of the Nd2Ni0.95Cu0.05O4+δ cathode did not change significantly after the exposure of the gaseous chromium species at 800°C
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 629-634
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mantle rock exposures at oceanic core complexes along mid-ocean ridges
Autorzy:
Ciazela, J.
Koepke, J.
Dick, H. J. B.
Muszynski, A.
Powiązania:
https://bibliotekanauki.pl/articles/94231.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
peridotite
OCC
detachment fault
megamullion
slow-spreading ridge
mid-ocean ridge
perydotyt
uskok przesuwczy
grzbiet śródoceaniczny
Opis:
The mantle is the most voluminous part of the Earth. However, mantle petrologists usually have to rely on indirect geophysical methods or on material found ex situ. In this review paper, we point out the in-situ existence of oceanic core complexes (OCCs), which provide large exposures of mantle and lower crustal rocks on the seafloor on detachment fault footwalls at slow-spreading ridges. OCCs are a common structure in oceanic crust architecture of slow-spreading ridges. At least 172 OCCs have been identified so far and we can expect to discover hundreds of new OCCs as more detailed mapping takes place. Thirty-two of the thirty-nine OCCs that have been sampled to date contain peridotites. Moreover, peridotites dominate in the plutonic footwall of 77% of OCCs. Massive OCC peridotites come from the very top of the melting column beneath ocean ridges. They are typically spinel harzburgites and show 11.3–18.3% partial melting, generally representing a maximum degree of melting along a segment. Another key feature is the lower frequency of plagioclase-bearing peridotites in the mantle rocks and the lower abundance of plagioclase in the plagioclase-bearing peridotites in comparison to transform peridotites. The presence of plagioclase is usually linked to impregnation with late-stage melt. Based on the above, OCC peridotites away from segment ends and transforms can be treated as a new class of abyssal peridotites that differ from transform peridotites by a higher degree of partial melting and lower interaction with subsequent transient melt.
Źródło:
Geologos; 2015, 21, 4; 207-231
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Walsh-chirp sequences for wireless applications
Autorzy:
Wysocki, B. J.
Wysocki, T. A.
Zepernick, H.-J.
Powiązania:
https://bibliotekanauki.pl/articles/309560.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
spread spectrum communications
polyphase spreading sequences
multi-access interference
Walsh sequences
aperiodic correlation functions
Opis:
This paper deals with a new method to design polyphase spreading sequences for DS CDMA wireless applications. The method is based on weighting symbols of the orthogonal Walsh sequences by the complex factors being symbols of baseband chirp sequences. The resulting sequences possess good aperiodic correlation properties, while maintaining the orthogonality. Because of the parametric design, the sequences can be optimized to achieve desired characteristics.
Źródło:
Journal of Telecommunications and Information Technology; 2001, 3; 24-28
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
De-Lubrication Behavior Of Novel EBS Based Admixed Lubricant In Aluminum P/M Alloy
Zachowanie nowego lubrykantu na bazie EBS w trakcie spiekania proszku stopu aluminium
Autorzy:
Oh, M. C.
Seok, H.
Kim, H. J.
Ahn, B.
Powiązania:
https://bibliotekanauki.pl/articles/354258.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
admixed lubricant
compaction pressure
powder metallurgy
sintering
Al-Cu-Mg alloy
lubrykant
zagęszczanie
metalurgia proszków
spiekanie
stop Al-Cu-Mg
Opis:
The objective of the present research is to develop a novel lubricant for Al-Cu-Mg P/M alloy and to address the effects of the lubricant and compaction pressure on sintered properties. A lubricant mixture consisting of Ethylene Bis Stearamide, Zn-Stearate, and fatty acid was newly developed in this study, and the de-lubrication behavior was compared with that of other commercial lubricants, such as Ethylene Bis Stearamide, Zn-Stearate, and Al-Stearate. Density and transverse rupture strength of sintered materials with each lubricant were examined, respectively. The microstructural analysis was conducted using optical microscope.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1427-1431
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pliensbachian, Early Jurassic radiolarians from Mount Rettenstein in the Northern Calcareous Alps, Austria
Autorzy:
Cifer, T.
Gorican, S.
Gawlick, H.-J.
Auer, M.
Powiązania:
https://bibliotekanauki.pl/articles/2082123.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Radiolaria
Polycystina
systematics
stratigraphy
Jurassic
Western Tethys
Eastern Alps
Austria
Opis:
One of the best preserved Early Pliensbachian radiolarian assemblages from the Western Tethys is described from the grey marly limestone exposed at Mount Rettenstein in the Northern Calcareous Alps, south of the Dachstein Massif. Fourty-five genera and 71 species are documented and illustrated here. Four species are newly described: Tozerium filzmoosense Cifer sp. nov., Loupanus pliensbachicus Cifer sp. nov., Thurstonia? robusta Cifer sp. nov., and Ares rettensteinensis Cifer sp. nov. Radiolarian age is in accordance with ammonoid data from the overlying red marly limestone, which was assigned to the upper part of the Lower Pliensbachian. The best equivalent for the radiolarian-bearing lithology is the Dürrnberg Formation, characteristic of the open-marine Hallstatt facies zone. Previously published radiolarian data from the Dürrnberg Formation were re-evaluated and the originally proposed age assignments revised. At two localities, the published Hettangian–Sinemurian age was emended to the early Early Pliensbachian that is in accordance with the age of radiolarians from Mount Rettenstein. We compared the studied fauna from Mount Rettenstein also with two other rich radiolarian assemblages, one from another locality in the Dürrnberg Formation and one from the Gümüslü Allochthon in Turkey, which were assigned to the late Early Pliensbachian and are somewhat younger than the assemblages studied herein.
Źródło:
Acta Palaeontologica Polonica; 2020, 65, 1; 167-207
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On some new phenomena in state-constrained optimal control if ODEs as well as PDEs are involved
Autorzy:
Pesch, H. J.
Rund, A.
Wahl, V.
Wendl, S.
Powiązania:
https://bibliotekanauki.pl/articles/969885.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal control of partial differential equations
ODE-PDE-constrained optimization
state constraints
non-local state-constraints
integro-state constraints
optimal control problems for integro-differential equations
jump conditions
Opis:
In this paper we investigate a new class of optimal control problems with ODE as well as PDE constraints. We would like to call them "hypersonic rocket car problems", since they were inspired, on the one hand, by the well known rocket car problem from the early days of ODE optimal control, on the other hand by a recently investigated flight path trajectory optimization problem for a hypersonic aircraft. The hypersonic rocket car problems mimic the latter's coupling structure, yet in a strongly simplified form. They can therefore be seen as prototypes of ODE-PDE control problems. Due to their relative simplicity they allow to a certain degree to obtain analytical solutions and insights into the structure of the adjoints, which would currently be unthinkable with complex real life problems. Our main aim is to derive and verify the necessary optimality conditions. Most of the obtained results bear a lot of similarities with state constrained ODE optimal control problems, yet we also observed some new phenomena.
Źródło:
Control and Cybernetics; 2010, 39, 3; 647-660
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tutorial on operating characteristics of microprocessor-based multiterminal line current differential relays
Autorzy:
Kasztenny, B
Benmouyal, G
Altuve, H J
Fischer, N
Powiązania:
https://bibliotekanauki.pl/articles/410604.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
protective relaying
differential protection
Alpha Plane principle
Opis:
Line current differential (87L) protection schemes face extra challenges compared with other forms of differential protection, in addition to the traditional requirements of sensitivity, speed, and immunity to current transformer saturation. Some of these challenges include data communication, alignment, and security; line charging current; and limited communications bandwidth. To address these challenges, microprocessor-based 87L relays apply elaborate operating characteristics, which are often different than a traditional percentage differential characteristic used for bus or transformer protection. These sophisticated elements may include adaptive restraining terms, apply an Alpha Plane, use external fault detection logic for extra security, and so on. While these operating characteristics provide for better performance, they create the following challenges for users: x Understanding how the 87L elements make the trip decision. x Understanding the impact of 87L settings on sensitivity and security, as well as grasping the relationship between the traditional percentage differential characteristic and the various 87L operating characteristics. x Having the ability to transfer settings between different 87L operating characteristics while keeping a similar balance between security and dependability. x Testing the 87L operating characteristics. These issues become particularly significant in applications involving more than two currents in the line protection zone (multiterminal lines) and lines terminated on dual-breaker buses. This paper is a tutorial on this relatively new protection topic and offers answers to the outlined challenges.
Źródło:
Present Problems of Power System Control; 2013, 3; s. 5-73
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konkurencyjne zdolności pszenicy ozimej wobec chwastów w warunkach różnych sposobów odchwaszczania – produkcja biomasy
Competitive ability of winter wheat to weeds under different weed control measures – biomass production
Autorzy:
Jędruszczak, M.
Bojarczyk, M.
Smolarz, H. J.
Budzyńska, B.
Powiązania:
https://bibliotekanauki.pl/articles/10499474.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
konkurencja roslin
uprawa roslin
chwasty
pszenica ozima
zwalczanie chwastow
pszenica Kobra
biomasa
powietrznie sucha masa
produkcja biomasy
odmiany roslin
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura; 2004, 59, 2; 895-902
0365-1118
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluating the Use of Renewable Energy and Communal Governance Systems for Climate Change Adaptation
Autorzy:
Ley, Debora
Corsair, H J
Fuss, Sabine
Singh, Chandni
Powiązania:
https://bibliotekanauki.pl/articles/14156628.pdf
Data publikacji:
2020-02-12
Wydawca:
Wyższa Szkoła Bankowa we Wrocławiu
Tematy:
renewable energy
adaptation
climate
resilience
institutions
governance
Guatemala
Opis:
Aim: Renewable energy (RE) systems can be effective tools for rural communities for meeting goals for development and climate change mitigation and adaptation. RE systems provide small amounts of electricity fostering community development through improved energy access, livelihood opportunities, and improved quality of life. Communities in rural Guatemala are increasingly vulnerable to climate change impacts, due to increasingly extreme weather events. Distributed RE systems can be more effective than connection to national electric grids in providing power if community members have the agency and skill (technical and in governance) to maintain them. The goal was to evaluate the performance of RE systems used in a rural Guatemalan community and the governance system created around it. Design/Research methods: The specific RE systems were evaluated eight years ago; they had performed well especially after Hurricane Stan. Recommendations were made for further performance improvement. This study evaluates the subsequent performance given more intense rains, and the current state of related community governance on the basis of semi-structured interviews. Conclusions/findings: This research highlights the need for enhanced and continuous monitoring and evaluation methods for both energy projects and their supporting institutional structures. Accountability, mediation mechanisms and transparency tools within these institutions can allow more open communication and equitable treatment with agents of power. Originality/value of the article: The article provides original insights for project implementation and policy information. Strong trust bonds are necessary for community resilience in emergencies, and in the well-being and development of the community, independent of energy sources.
Źródło:
Central European Review of Economics and Management; 2020, 4, 1; 53-70
2543-9472
Pojawia się w:
Central European Review of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interface Engineering in Heteroepitaxy
Autorzy:
Hong, S. K.
Chen, Y.
Ko, H. J.
Yao, T.
Powiązania:
https://bibliotekanauki.pl/articles/2035571.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.-p
68.35.Dv
81.15.-z
81.15.Hi
81.10.Aj
Opis:
We report the importance of interface engineering in heteroepitaxy with examples of plasma-assisted molecular beam epitaxial ZnO growths on (0001) sapphire substrates and on (0001) GaN/sapphire templates, whose interfaces are engineered to improve and to control properties of ZnO films. The growth of rocksalt structure MgO buffer on Al$\text{}_{2}$O$\text{}_{3}$ (0001) is developed for ZnO epitaxy. By employing the MgO buffer layer, the formation of 30$\text{}^{o}$ rotated mixed domains is prohibited and two-dimensional layer-by-layer growth of ZnO on sapphire substrate is achieved. High-resolution X-ray diffraction reveals the superior improvement in a crystal quality of ZnO films with an MgO buffer. Polarity of wurtzite structure ZnO films on Ga-polar GaN/sapphire templates is controlled by changing interface structures. By forming a single crystalline, monoclinic Ga$\text{}_{2}$O$\text{}_{3}$ interfacial layer between GaN and ZnO through O-plasma pre-exposure on the Ga-polar GaN surface, O-polar ZnO films are grown. By forming the ZnO/GaN heterointerface without an interfacial layer through the Zn pre-exposure on the Ga-polar GaN surface, Zn-polar ZnO films are grown.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 541-554
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konkurencyjne zdolności pszenicy ozimej wobec chwastów w warunkach różnych sposobów odchwaszczania – behawior zbiorowiska chwastów
Competitive ability of winter wheat weeds under different weed control measures-weed community behaviour
Autorzy:
Jędruszczak, M.
Bojarczyk, M.
Smolarz, H. J.
Dąbek-Gad, M.
Powiązania:
https://bibliotekanauki.pl/articles/10588920.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
lan roslin
konkurencja roslin
sklad gatunkowy
uprawa roslin
chwasty
pszenica ozima
pszenica Kobra
powietrznie sucha masa
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura; 2004, 59, 2; 903-912
0365-1118
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved Photovoltaic Properties Of Dye-Sensitized Solar Cells Using Laser Patterned F-Doped SnO2 Thin Films
Poprawa właściwości fotowoltaicznych ogniw słonecznych uczulonych barwnikiem przez laserową modyfikację powierzchni cienkich warstw SnO2
Autorzy:
An, H.-R.
An, H.
Riu, D.-H.
Ahn, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/353636.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dye-sensitized solar cells
F-doped SnO2 thin films
surface morphology
laser patterning
fotowoltaniczne ogniwa słoneczne
cienkie warstwy SnO2
morfologia powierzchni
modyfikacja laserowa
Opis:
We modified the surfaces of F-doped SnO2 thin films using laser patterning to improve the photovoltaic properties of dye-sensitized solar cells. To do so, we varied the laser power density and the distance between laser-patterned lines. First, we investigated three power densities. Higher densities led to higher sheet resistances owing to increases in surface roughnesses. The lowest power density increased surface roughness without electrical degradation. Next, we explored three line spacings at a fixed power density. The films with the narrowest spacing exhibited the highest power conversion efficiency (~7.00%), the highest short-circuit photocurrent density (16.28 mA/cm2), and a good fill factor (58.82%).
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1241-1245
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical analytical solution of deformation and stress distribution of underground gas storage cavern in bedded salt rock
Autorzy:
Xie, P.
Wen, H. J.
Wang, G. J.
Hu, J.
Powiązania:
https://bibliotekanauki.pl/articles/230968.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
złoża soli kamiennej
analiza teoretyczna
funkcja wypierania Love'a
zasada zgodności sprężysto-lepkosprężystej
różnica skończona trójwymiarowa wyraźna
bedded salt rock
theoretical analysis
Love displacement function
elastic-viscoelastic correspondence principle
three-dimensional explicit finite-difference
Opis:
The main purpose of the study is to investigate the mechanical properties around an underground gas storage cavern in bedded salt rock. Firstly, considering the characteristics of the salt rock formation in China, the mechanical model was simplified into a hollow cylinder, which containing non-salt interlayer. In terms of elastic theory, Love displacement function was developed, and the elastic general solution of stress and deformation components were obtained after determining the undetermined coefficients. Under the same condition, numerical simulation was carried out. The validity of the elastic general solution is verified by comparing to numerical simulation results. Furthermore, Based on the feasible general elastic solution, viscoelastic solution was obtained through Laplace transformation and inverse Laplace transform, which could provide reference for the study on the stability and tightness of underground gas storage carven during operation to some extent.
Źródło:
Archives of Civil Engineering; 2018, 64, 4/I; 37-53
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekspedycja IODP 360 : pierwszy etap odwiertu do płaszcza Ziemi
IODP Expedition 360 : first stage of drilling into Earth’s Mantle
Autorzy:
Ciążela, J.
Dick, H. J. B.
Mac-Leod, Ch.
Blum, P.
Powiązania:
https://bibliotekanauki.pl/articles/2075550.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Moho
płaszcz
skorupa dolna
wyprawa 360
IODP
Atlantis Bank
mantle
lower crust
expedition 360
International Ocean Discovery Program
Opis:
The aim of this paper is to provide a report on the IODP expedition 360 to the Polish geoscientific community. Expedition 360 to the Atlantis Bank along the Southwest Indian Ridge was Leg 1 of the SloMo Project. The primary objective of the SloMo Project is to test competing hypotheses on the nature of the Moho at the slow-spreading oceanic lithosphere. Based on a seismic survey and geologic mapping, the Moho beneath Atlantis Bank is believed to represent a serpentinization front, and not an igneous boundary between gabbro andperidotite. Expedition 360 started on November 30,2015 in Colombo (Sri Lanka), and ended on January 30,2015 in Port Louis (Mauritius). Hole U1473A was drilled 790 m through massive gabbro. Core recovery ranges from 44 to 96% towards the bottom of the hole, where excellent drilling conditions occurred. This deepest single-leg basement hole drilled into ocean crust is in overall good condition andcan be re-entered at Leg 2. For the first time, a Polish nominee has been selectedfor the scientific party of an oceanic IODP expedition. The mantle drilling project raised much attention in the Polish media. One hundred rock samples have been collected to investigate in Poland.
Źródło:
Przegląd Geologiczny; 2016, 64, 11; 889--895
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cycle dependent LH-hCG receptor gene expression in porcine nongonadal reproductive tissues
Autorzy:
Derecka, K
Pietila, E.M.
Rajaniemi, H.J.
Ziecik, A.J.
Powiązania:
https://bibliotekanauki.pl/articles/69076.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
pig
reproductive tissue
RNA
human physiology
receptor
gene expression
hybridization
luteal cell
interstitial cell
chorionic gonadotrophin
rat
alternative splicing
Źródło:
Journal of Physiology and Pharmacology; 1995, 46, 1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of Langmuir-Blodgett Film Surface Stm Images
Autorzy:
Agabekov, V. E.
Zhavnerko, G. K.
Bar, G.
Cantow, H.-J.
Powiązania:
https://bibliotekanauki.pl/articles/1968763.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
71.20.Rv
02.60.Cb
Opis:
The simulation of the STM image of a hydrocarbon tail of a fatty acid was carried out and compared to the experimental results. The simulation procedure includes calculations of the distribution of an isolated molecule electronic density by the extended Huckel-Hoffmann method. An agreement between the calculated and experimental STM images of closely packed Langmuir-Blodgett film of cobalt behenate on the graphite surface was observed. The weak interactions between the graphite surface and the adsorbed molecules constituting bi- and multilayer Langmuir-Blodgett films can be neglected in simulations of STM images.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 383-386
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Temperature Deformation Flow Of A ZK60A Magnesium Alloy After Extrusion
Płynięcie stopu magnezu ZK60A podczas wysokotemperaturowego odkształcenia w trakcie wytłaczania
Autorzy:
Kawasaki, M.
Lee, H. J.
Oh, M. C.
Ahn, B.
Powiązania:
https://bibliotekanauki.pl/articles/354374.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
activation energy
extrusion
flow mechanics
magnesium alloy
tensile property
energia aktywacji
wytłaczanie
mechanika przepływu
stop magnezu
rozciąganie
Opis:
Flow behavior of a ZK60A magnesium alloy after continuous casting and subsequent extrusion was examined in tension at a range of strain rates of 3.0×10-6 − 1.0×10-2 s-1 at temperatures of 473-623K. The results demonstrated that the alloy exhibited a maximum elongation of ~250% at 523K when tested at an initial strain rate of 1.0×10-5 s-1 and strain rate sensitivity, m, of ~0.3-0.4 and the activation energy of ~94 kJ/mol were calculated under the testing conditions. The detailed investigation suggested that the high temperature flow of the ZK60A alloy having submicrometer grains demonstrates quasi-superplastic flow behavior controlled by a dislocation viscous glide process.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1327-1330
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complementarity of Neutron and Ultrahigh Resolution Synchrotron X-Ray Protein Crystallography Studies: Results with Concanavalin A at Cryo and Room Temperature
Autorzy:
Helliwell, J. R.
Price, H. J.
Deacon, A.
Raftery, J.
Habash, J.
Powiązania:
https://bibliotekanauki.pl/articles/2030526.pdf
Data publikacji:
2002-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.-t
87.15.-v
61.12.-q
Opis:
The complementarity of synchrotron derived ultrahigh resolution X-ray and neutron protein crystallography is explored via an ensemble of plant lectin concanavalin A crystal structures. Thus a resume of a study of a cryo 0.94Å and a neutron (+X-ray) protein crystal 2.4Å structure at room temperature is made and these are then compared in their efficiency to determine the positions of the bound solvent atoms i.e. as hydrogens or deuteriums. First results are also presented of comparisons of two ultrahigh resolution protein crystal structures, the 0.94Å and a new 0.92Å structure. Thus the variability of the two cryo structures, at very fine detail, is described; this variability is in the multiple occupancies of side chains. Overall, one can see that a "complete" structure definition, with today's experimental capabilities, is possible and can include structure ensemble variations.
Źródło:
Acta Physica Polonica A; 2002, 101, 5; 583-588
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
User requirements supporting the safe navigation in Korean Coast
Autorzy:
Jeong, J.S.
Jeong, J.
Kim, H.J.
Kim, S. Y.
Powiązania:
https://bibliotekanauki.pl/articles/320412.pdf
Data publikacji:
2013
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
user requirements
user needs
e-navigation
safe navigation
navigational information
Opis:
This research aims at investigating the user requirements at the service level for safe navigation system, following e-navigation strategy implementation plan. The user requirements is surveyed to collect real-time navigational information and then to find out services through the presentation of the collected information. To provide the information on user needs for the system developer, a questionnaire survey has been made. Based on this surveys, this research investigated which navigational information is with higher priority for the safe navigation during ship operation by bridge team in harbour and in coastal and confined.
W artykule przedstawiono wyniki badań wymagań użytkownika związanych z poziomem bezpieczeństwa nawigacji, stosownie do strategii wprowadzania e-nawigacji. Badano oczekiwania użytkowników odnośnie informacji nawigacyjnej dostarczanej w czasie rzeczywistym oraz sposobu jej prezentacji metodą ankietową. Wykonano przegląd kwestionariuszy dla ustalenia informacji o potrzebach użytkownika z myślą o projektantach systemów. Na bazie opisywanych badań ustalono, jakie informacje nawigacyjne cechują się najwyższym priorytetem w opinii użytkowników, zarówno w warunkach żeglugi przybrzeżnej, jak i w porcie lub akwenie ograniczonym.
Źródło:
Annual of Navigation; 2013, 20; 37-48
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of pre-coarsening on architectural and mechanical properties of highly porous titanium dioxide scaffolds for bone tissue engineering
Autorzy:
Reczyńska, K.
Rumian, Ł.
Pamuła, E.
Haugen, H. J.
Tiainen, H.
Powiązania:
https://bibliotekanauki.pl/articles/284566.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
bone tissue engineering
porous titanium
biomaterials
Źródło:
Engineering of Biomaterials; 2014, 17, no. 128-129; 96-98
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific Heat of Cr-Based Semimagnetic Semiconductors
Autorzy:
Twardowski, A.
Eggenkamp, P.
Mac, W.
Swagten, H. J. M.
Demianiuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929660.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
71.70.Ch
71.70.Ej
Opis:
Specific heat of ZnCrSe and ZnCrS was measured for 1.5 < T < 10 K and B < 3 T. The data were interpreted using "crystal field model" taking into account tetrahedral crystal field, tetragonal Jahn-Teller distortion and spin-orbit interaction.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 563-565
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the intensification and diversification balance of the tabu solution for the Robust Capacitated International Sourcing problem (RoCIS)
Autorzy:
Huacuja, H. J. F.
González-Velarde, J. R.
Valdez, G. C.
Powiązania:
https://bibliotekanauki.pl/articles/385145.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
RoCis
heuristic approach
optimization
initial solution
tabu search
memory strategies
Opis:
This paper addresses the robust capacitated international sourcing problem (RoCIS), which consists of selecting a subset of suppliers with finite capacity, from an available set of potential suppliers internationally located. This problem was introduced by González-Velarde and Laguna in [1], where they propose a deterministic solution method based on tabu search memory strategies. The pro cess consists of three steps: build an initial solution, create a neighborhood of promising solutions and perform a local search in the neighborhood. In this work we propose improving the construction of the initial solution, the cons truction of the neighborhood, the local search, and the intensification and diversification balance. Experimental evidence shows that the improved tabu solution with diver sification outperforms the best solutions reported for six of the instances considered, increases by 18% the number of best solutions found and reduces by 44% the deviation of the best solution found, respect to the best algorithm reported.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2010, 4, 4; 64-73
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Smoking and the level of nicotine addiction in relation to the state of hard dental tissues in young adults
Autorzy:
Sikorska-Jaroszynska, M.H.J.
Mielnik-Blaszczak, M.
Krawczyk, D.
Nasilowska-Barud, A.
Powiązania:
https://bibliotekanauki.pl/articles/50206.pdf
Data publikacji:
2011
Wydawca:
Instytut Medycyny Wsi
Tematy:
cigarette smoking
nicotine addiction
nicotine level
hard dental tissue
young adult
adult
human behaviour
Źródło:
Annals of Agricultural and Environmental Medicine; 2011, 18, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulations of the 3D Ising Model at Criticality
Autorzy:
Blöte, H. W. J.
Kamieniarz, G.
Powiązania:
https://bibliotekanauki.pl/articles/1930588.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.50.+q
64.60.-i
64.60.Fr
75.40.Mg
64.60.Ak
Opis:
We present some new finite-size results for the Binder cumulant that we obtained by means of a transfer-matrix perturbation expansion and by the cluster Monte Carlo methods - the Swendsen-Wang and Wolff algorithms and the largest-cluster method. A finite-size scaling analysis taking into account a correction to scaling locates the critical coupling at Kc = 0.221649(4).
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 395-398
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogen Assisted Cracking in a Microalloyed Steel Subjected to a Rapid Thermal Cycle at High Temperature
Autorzy:
Lopez-Martinez, E.
Vázquez-Gómez, O.
Vergara-Hernández, H. J.
Campillo, B.
Powiązania:
https://bibliotekanauki.pl/articles/352035.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
persistent slip mark
fatigue crack growth
hydrogen enhanced local plasticity
microalloyed steel
Opis:
In a martensitic-bainitic microalloyed steel, the effect of hydrogen on fatigue crack growth was studied using rotary bending fatigue tests. The steel was subjected to a rapid thermal cycle to get a microstructure similar to that which would be formed within the coarse-grained heat-affected zone of a weld. Crack growth was monitored as a function of the number of cycles applied during fatigue tests on three types of specimens: 1) those without hydrogen charge, 2) those charged with hydrogen and 3) those charged with hydrogen which was then discharged through low-temperature heat treatment. All types showed persistent slip marks, and cracks propagated along high-shear-stress planes. In the presence of hydrogen, crack growth was affected by microstructural defects caused by the hydrogen charging process, and the persistent slip marks developed in an area closer to the crack tip and crack path. On the contrary, without hydrogen, crack growth occurred perpendicular to the applied force, and the persistent slip marks were fewer in number and further from the crack tip and crack path. This indicates that the plasticity increased (i.e., the damage that occurred in the presence of hydrogen matched the hydrogen-enhanced local plasticity mechanism).
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 315-321
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytoextraction of Cr by maize (Zea mays L.) : the role of plant growth promoting endophyte and citric acid under polluted soil
Autorzy:
Ali, J.
Mahmood, T.
Hayat, K.
Afridi, M. S.
Ali, F.
Chaudhary, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/204568.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
maize
phytoextraction
chromium
citric acid
Burkholderia vietnamiensis
Opis:
High chromium (Cr) toxicity has turned into a serious environmental concern. Cr contaminated agronomic soils negatively affect the growth and yield of crops. Current research was conducted to enhance the phytoextraction potential of maize by using Burkholderia vietnamiensis and citric acid (CA). Plants were subjected to three concentrations of Cr (0.86, 350, and 500 ppm). A pot experiment was conducted under greenhouse conditions with completely randomized design (CRD). After 72 days of experiment, plants were harvested to analyze the morphological and biochemical attributes of soil, bacteria and plant. Results revealed that plant fresh, dry biomass, root, shoot length and chlorophyll contents significantly increased by 56%, 50%, 58%, 78% and 60%, respectively, at 500 ppm Cr concentration in combine treatment of B. vietnamiensis and CA. Maize plants treated with both B. vietnamiensis and CA significantly increased the bioaccumulation (BA) of Cr up to 50% and translocation factor (TF) by 31%. Furthermore, superoxide dismutase (SOD), proline and peroxidase dismutase (POD) activities in leaves were markedly increased by 30%, 42% and 15%, respectively, when treated with CA. Current study reveals that exogenous co-application of B. vietnamiensis + CA enhance plant growth by alleviating heavy metal stress and accelerate the phytoextraction of Cr. Taking into account the heavy metal tolerance and accumulation capacity, Zea mays is suitable for phytoremediation of contaminated soils in combination with B. vietnamiensis and CA.
Źródło:
Archives of Environmental Protection; 2018, 44, 2; 73-82
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of patterns on image-based modelling of texture-less objects
Autorzy:
Hafeez, J.
Jeon, H.-J.
Hamacher, A.
Kwon, S.-C.
Lee, S.-H.
Powiązania:
https://bibliotekanauki.pl/articles/221814.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
structure-from-motion
feature detection
patterns analysis
3D reconstruction
surface comparison
Opis:
The task of generating fast and accurate three-dimensional (3D) models of objects or scenes through a sequence of non-calibrated images is an active field of research. The recent development in algorithm optimization has resulted in many automatic solutions that can provide an accurate 3D model from texture-full objects. Structure-from-motion (SfM) is an image-based method that uses discriminative point-based feature identifier, such as SIFT, to locate feature points in the images. This method faces difficulties when presented with the objects made of homogenous or texture-less surfaces. To reconstruct such surfaces a well-known technique is to apply an artificial variety by covering the surface with a random texture pattern prior to the image capturing process. In this work, we designed three series of image patterns which are tested based on the contrast and density ratio which increases from the first to the last pattern within the same series. The performance of the patterns is evaluated by reconstructing the surface of a texture-less object and comparing it with the true data. Using the best-found patterns from the experiments, a 3D model of a Moai statue is reconstructed. The experimental results demonstrate that the density and structure of a pattern highly affects the quality of the reconstruction.
Źródło:
Metrology and Measurement Systems; 2018, 25, 4; 755-767
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recurrent upper gastrointestinal bleed in a 26 year old female
Autorzy:
Heavener, T.
Patel, P.
Garner, J.
Sing, J.
Jeffries, M.
Thomas, H.J.
Powiązania:
https://bibliotekanauki.pl/articles/1918636.pdf
Data publikacji:
2018-06-21
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Anemia
coil migration
endoscopy
Opis:
According to recent society guidelines, upper gastrointestinal bleed initial approach includes assessment of hemodynamic status, fluid resuscitation if necessary, transfusion strategy to target hemoglobin above 7 (g/dL), use of intravenous proton pump inhibitor and generally upper endoscopy within 24 hours. We present a case of a 26-year-old woman who sought treatment after one episode of hematemesis and pre-syncope. She had a similar presentation three months earlier and received interventional radiology-guided mesenteric angiography and the use of multiple coils to embolize a 1.5-cm deep punched-out duodenal ulcer. Migration of the coil was noted on endoscopy within the previously described ulcer. Coil migration is expected to occur in up to 3% of cases of endovascular embolization. However, migration into the duodenum is uncommon and could have actually been a contributing factor to the current bleed.
Źródło:
Progress in Health Sciences; 2018, 8(1); 231-233
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of sintering conditions on microstructure and mechanical properties of titanium dioxide scaffolds for the treatment of bone tissue defects
Autorzy:
Rumian, Ł.
Reczyńska, K.
Wrona, M.
Tiainen, H.
Haugen, H. J.
Pamuła, E.
Powiązania:
https://bibliotekanauki.pl/articles/307325.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
porowatość
inżynieria tkankowa
ditlenek tytanu
właściwości mechaniczne
porosity
titanium dioxide
bone tissue engineering
mechanical properties
polymer sponge replication
ceramic scaffolds
Opis:
In this study the attempts to improve mechanical properties of highly-porous titanium dioxide scaffolds produced by polymer sponge replication method were investigated. Particularly the effect of two-step sintering at different temperatures on microstructure and mechanical properties (compression test) of the scaffolds were analysed. To this end microcomputed tomography and scanning electron microscopy were used as analytical methods. Our experiments showed that the most appropriate conditions of manufacturing were when the scaffolds were heat-treated at 1500 °C for 1 h followed by sintering at 1200 °C for 20 h. Such scaffolds exhibited the highest compressive strength which was correlated with the highest linear density and the lowest size of grains. Moreover, grain size distribution was narrower with predominating fraction of fine grains 10–20 μm in size. Smaller grains and higher linear density suggested that in this case densification process prevailed over undesirable process of grain coarsening, which finally resulted in improved mechanical properties of the scaffolds.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 1; 3-9
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of plant infections by thermal vision and NIR imaging
Autorzy:
Hellebrand, H.J.
Herppich, W.B.
Beuche, H.
Dammer, K.H.
Linke, M.
Flath, K.
Powiązania:
https://bibliotekanauki.pl/articles/24915.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
plant discrimination
infrared imaging
thermal vision
plant protection
transpiration
plant infection
fungal infection
Źródło:
International Agrophysics; 2006, 20, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Milling Time Parameter on the Microstructure and the Thermoelectric Properties of n-Type Bi2Te2.7Se0.3 Alloys
Autorzy:
Sharief, P.
Madavali, B.
Koo, J. M.
Kim, H. J.
Hong, S.
Hong, S.-J.
Powiązania:
https://bibliotekanauki.pl/articles/354418.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ball milling
milling time
microstructure
thermoelectric properties
ZT
Opis:
Nanostructured thermoelectric materials receiving great attention for its high thermoelectric performance. In this research, nanostructured n-type Bi2 Te2.7 Se0.3 alloys have prepared using high energy ball milling and followed by spark plasma sintering. Also, we have varied ball milling time to investigate milling time parameter on the thermoelectric properties of n-type Bi2 Te2.7 Se0.3 powder. The powders were discrete at 10 min milling and later particles tend to agglomerate at higher milling time due to cold welding. The bulk fracture surface display multi-scale grains where small grains intersperse in between large grains. The maximum Seebeck coefficient value was obtained at 20-min milling time due to their lower carrier density. The κ values were decreased with increasing milling time due to the decreasing trend observed in their κL values. The highest ZT of 0.7 at 350 K was observed for 30-min milling time which was ascribed to its lower thermal conductivity. The Vickers hardness values also greatly improved due to their fine microstructure.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 585-590
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Magnetic Properties of NdFeB Sintered Magnets Diffusion-Treated with Cu/Al Mixed Dyco Alloy-Powder
Autorzy:
Lee, M.-W.
Bae, K.-H.
Lee, S.-R.
Kim, H.-J.
Jang, T.-S.
Powiązania:
https://bibliotekanauki.pl/articles/353351.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Nd-Fe-B sintered magnets
grain boundary diffusion process
low melting point element
DyCo alloy-powder diffusion
Opis:
We investigated the microstructural and magnetic property changes of DyCo, Cu + DyCo, and Al + DyCo diffusion-treated NdFeB sintered magnets. The coercivity of all diffusion treated magnet was increased at 880ºC of 1st post annealing(PA), by 6.1 kOe in Cu and 7.0 kOe in Al mixed DyCo coated magnets, whereas this increment was found to be relatively low (3.9 kOe) in the magnet coated with DyCo only. The diffusivity and diffusion depth of Dy were increased in those magnets which were treated with Cu or Al mixed DyCo, mainly due to comparatively easy diffusion path provided by Cu and Al because of their solubility with Ndrich grain boundary phase. The formation of Cu/Al-rich grain boundary phase might have enhanced the diffusivity of Dy-atoms. Moreover, relatively a large number of Dy atoms reached into the magnet and mostly segregated at the interface of Nd2 Fe14 B and grain boundary phases covering Nd2 Fe14 B grains so that the core-shell type structures were developed. The formation of highly anisotropic (Nd, Dy)2Fe14B phase layer, which acted as the shell in the core-shell type structure so as to prevent the reverse domain movement, was the cause of enhancing the coercivity of diffusion treated NdFeB magnets. Segregation of cobalt in Nd-rich TJP followed by the formation of Co-rich phase was beneficial for the coercivity enhancement, resulting in the stabilization of the metastable c-Nd2O3 phase.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1263-1266
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Passive smoking as an environmental health risk factor
Autorzy:
Sikorska-Jaroszynska, M.H.J.
Mielnik-Blaszczak, M.
Krawczyk, D.
Nasilowska-Barud, A.
Blaszczak, J.
Powiązania:
https://bibliotekanauki.pl/articles/51680.pdf
Data publikacji:
2012
Wydawca:
Instytut Medycyny Wsi
Opis:
Initially, tobacco was considered as a decorative plant and only later began to be treated as a herb with special therapeutic properties. With time, it was found that tobacco had strong insecticidal and addictive properties. There also occurred reports about the negative influence of tobacco on human health. The World Health Organization (WHO) classifies smoking as a chronic, progressive disease which is also ‘contagious’. It is also considered to be a neurobiotic addiction. Nicotine addiction does not cause changes in the behaviour or functioning of a smoker; however, it adversely affects his or her general health status and the health status of people within their environment. Passive smoking (so-called ETS – Environmental Tobacco Smoke), which means accompanying smokers negatively influences the health of passive smokers. Environmental tobacco smoke, on the one hand, is the result of spontaneous cigarette burning and, on the other hand, the result of the side-stream of cigarette smoke, as well as the smoke exhaled by active smokers. Health personnel should clearly and convincingly present the data concerning the adverse results of smoking, as well as the dangers of exposure to environmental tobacco smoke, thereby making their patients aware that breaking their addiction will not only be beneficial for their own health, but will also protect non-smokers in their environment from the adverse effects of exposure to environmental tobacco smoke.
Źródło:
Annals of Agricultural and Environmental Medicine; 2012, 19, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Teager Kaiser Energy Operator in an autonomous burst detector to create onset and offset profiles of forearm muscles during reach-to-grasp movements
Autorzy:
Krabben, T.
Prange, G. B.
Kobus, H. J.
Rietman, J. S.
Buurke, J. H.
Powiązania:
https://bibliotekanauki.pl/articles/306581.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
elektromiografia
AGLR
Teager-Kaiser
electromyography
timing
reach
grasp
Opis:
Purpose: The primary aim of this study is to investigate the potential benefit of the Teager–Kaiser Energy Operator (TKEO) as data pre-processor, in an autonomous burst detection method to classify electromyographic signals of the (fore)arm and hand. For this purpose, optimal settings of the burst detector, leading to minimal detection errors, need to be known. Additionally, the burst detector is applied to real muscle activity recorded in healthy adults performing reach-to-grasp movements. Methods: The burst detector was based on the Approximated Generalized Likelihood Ratio (AGLR). Simulations with synthesized electromyographic (EMG) traces with known onset and offset times, yielded optimal settings for AGLR parameters “window width” and “threshold value” that minimized detection errors. Next, comparative simulations were done with and without TKEO data pre-processing. Correct working of the burst detector was verified by applying it to real surface EMG signals obtained from arm and hand muscles involved in a submaximal reach-to-grasp task, performed by healthy adults. Results: Minimal detection errors were found with a window width of 100 ms and a detection threshold of 15. Inclusion of the TKEO contributed significantly to a reduction of detection errors. Application of the autonomous burst detector to real data was feasible. Conclusions: The burst detector was able to classify muscle activation and create Muscle Onset Offset Profiles (MOOPs) autonomously from real EMG data, which allows objective comparison of MOOPs obtained from movement tasks performed in different conditions or from different populations. The TKEO contributed to improved performance and robustness of the burst detector.
Źródło:
Acta of Bioengineering and Biomechanics; 2016, 18, 4; 135-144
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identifying overlapping phylogenetic and geographic roots of HIV - 1 evolution through computational analyses
Autorzy:
Singh, P.K.
Banik, R.
Chakraborty, H.J.
Das, S.G.
Ganguli, S.
Datta, A.
Powiązania:
https://bibliotekanauki.pl/articles/11359.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
phylogenetic root
geographic root
evolution
computational analysis
HIV-1
genome
recombinant strain
AIDS
human disease
acquired immunodeficiency syndrome zob.AIDS
acquired immune deficiency syndrome zob.AIDS
Opis:
HIV-1 or Human Immuno Deficiency Virus-1 is the main causative agent of Acquired Immuno Deficiency Syndrome (AIDS). Human host infected with HIV - 1 extensively harbours many viral variants but very little is known about the difference in pattern[17] of evolution of phylogenetic lineages of HIV-1 non recombinant, normal inter subtype recombinant and main two specific recombinant forms of HIV-1 i.e., Circulating Recombinant Forms (CRFs) and Unique Recombinant Forms (URFs). This study is mainly concerned with study of the difference in evolutionary lineages of non-recombinant and recombinant sequences of HIV-1 genome sequences and identification of geographically rich areas which has reported high degree of HIV-1 occurrence and variety. Total 1550 HIV-1 genome sequences were obtained from HIV Los Alamos Database. The sequences were aligned using MAFFT (Multiple Alignment using Fast Fourier Transform) web server tool. Alignment was carried out using 10 different set of alignment parameter values. After alignment the aligned file was used for constructing N-J phylogenetic tree using Clustal X2 tool. Phylogenetic analysis was performed keeping in mind the category to which the sequence belongs. Upon analysis it was observed that the clade containing the probable ancestor belongs remained constant in all cases of different alignment values. Non recombinant isolates, inter subtype recombinants, CRFs, URFs all followed different patterns of evolution. Non recombinant sequences were found geographically specific and subtype specific to some extent whereas, normal recombinants were subtype specific and less geographically specific. CRFs showed variation among the pattern of their evolution. At some instances the sequences occurred as sister taxa of non-recombinant or normal inter subtype recombinant sequences, while at some instances as sister taxa of other CRFs where they were geographically specific. Three CRFs existed as completely diverged sequences. URFs were four in number; two of them were Indian isolates of while other two were Japanese isolates. URFs were found to be totally geographically specific. Geography wise high rate of variation was observed in India and Japan as these two countries had sequences belonging to all of the above categories. Cameroon and South Africa have very large number isolates and a considerable amount of genetic variation among isolates but they lack URFs.
Źródło:
International Letters of Natural Sciences; 2014, 02
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling a cost benefit transportation model to optimize the redistribution process: Evidence study from Sri Lanka
Autorzy:
Jayarathna, D. G. Nuwan Dhammika
Lanel, G. H. J.
Juman, Z. A. M. S.
Powiązania:
https://bibliotekanauki.pl/articles/2141165.pdf
Data publikacji:
2021
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
vehicle routing problem
heterogeneous vehicle fleet
redistribution process
heuristic method
Opis:
This study is a case study based on Softlogic Retail (Pvt) Ltd, Sri Lanka, which is a famous consumer electronics company and market leader in Sri Lanka. This company’s outbound logistics have been considered in this research, and they are mainly forced into the redistribution process in Sri Lanka. Extra routing costs due to unreasonable consumption of additional distance have been noticed in the current redistribution process. Here, this problem is modeled as a variant of the vehicle routing problem with a heterogeneous vehicle fleet. Our objective is to minimize warehouse operation, administration, and transportation costs by imposing constraints on capacity and volume. The researchers propose new heuristic solutions to the problem. A proposed heuristic algorithm has been used to find the optimal path between clusters. The computational investigation highlights the cost savings that can be accrued by this new heuristic. The cost savings can be accrued at a rate of as much as 37.5 % compared to the company’s existing method.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2021, 6, 2; 43-59
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experiments and simulations on the possibility of radiative contraction/collapse in the PF-1000 plasma focus
Autorzy:
Akel, M.
Cikhardt, J.
Kubes, P.
Kunze, H.-J.
Lee, S.
Paduch, M.
Saw, S. H.
Powiązania:
https://bibliotekanauki.pl/articles/147275.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plasma focus
radiative collapse
radiation losses
simulations
Opis:
Experimental studies of discharges in the plasma focus facility with neon filling and respective numerical simulations employing the radiative Lee code are reported. The pinch currents exceed the Pease-Braginskii current, which indicates that radiative losses are larger than heating and that contraction of the formed plasma should occur. Both of these effects were indeed observed. Parallel numerical simulations were crucial for the identifi cation of such an effect.
Źródło:
Nukleonika; 2016, 61, 2; 145-148
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of Nickel Powders by Reduction of Nickel Hydroxide Using the Taylor Fluid Flow
Autorzy:
Park, I.-J.
Kim, D.-W.
Kim, G.-H.
Chae, H.-J.
Jung, H.-C.
Powiązania:
https://bibliotekanauki.pl/articles/355021.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ni(OH)2
nickel
Taylor fluid flow
fine powder
Opis:
In this study, Ni(OH)2 was synthesized by the continuous reaction by the Taylor fluid flow and compared with those prepared from the conventional batch type reaction. The nickel powders were synthesized by reduction of Ni(OH)2 in an aqueous solution with hydrazine hydrate acting as the reductant. And then the characteristics of the nickel powder according to the synthesis method were compared. The average particle size of the synthesized Ni(OH)2 using Taylor reactor was generally decreased about 1.5~2.5 times more than the batch reaction. The nickel powders prepared by the batch reaction highly agglomerated with non-uniform particles. In the Taylor reaction, the agglomeration of particles was broken and uniform nickel powder was produced.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1443-1447
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variation Analysis of CMOS Technologies Using Surface-Potential MOSFET Model
Autorzy:
Mattausch, H. J.
Yumisaki, A.
Sadachika, N.
Kaya, A.
Johguchi, K.
Koide, T.
Miura-Mattausch, M.
Powiązania:
https://bibliotekanauki.pl/articles/308251.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
compact model
fabrication inaccuracy
field-effect transistor
macroscopic
microscopic
potential at channel surface
silicon
within wafer
Opis:
An analysis of the measured macroscopic withinwafer variations for threshold voltage (Vth) and on-current (Ion) over several technology generations (180 nm, 100 nm and 65 nm) is reported. It is verified that the dominant microscopic variations of the MOSFET device can be extracted quantitatively from these macroscopic variation data by applying the surface-potential compact model Hiroshima University STARC IGFET model 2 (HiSIM2), which is presently brought into industrial application. Only a small number of microscopic parameters, representing substrate doping (NSUBC), pocket-implantation doping (NSUBP), carrier-mobility degradation due to gate-interface roughness (MUESR1) and channel-length variation during the gate formation (XLD) are found sufficient to quantitatively reproduce the measured macroscopic within-wafer variations of Vth and Ion for all channel length Lg and all technology generations. Quantitative improvements from 180 nm to 65 nm are confirmed to be quite large for MUESR1 (about 70%) and Lmin(XLD) (55%) variations, related to the gate-oxide interface and the gate-stack structuring, respectively. On the other hand, doping-related technology advances, which are reflected by the variation magnitudes of NSUBC (30%) and NSUBP (25%), are found to be considerably smaller. Furthermore, specific combinations of extreme microscopic parameter-variation values are able to represent the boundaries of macroscopic fabrication inaccuracies for Vth and Ion. These combinations are found to remain identical, not only for all Lg of a given technology node, but also for all investigated technologies with minimum Lg of 180 nm, 100 nm and 65 nm.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 4; 37-44
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 2903

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