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Wyświetlanie 1-15 z 101
Tytuł:
Expression of endothelin-1, and endothelin A and B receptors in portal hypertensive esophagus of rats
Autorzy:
Ohta, M.
Pai, R.
Kawanaka, H.
Ma, T.
Sugimachi, K.
Sarfeh, I.J.
Tarnawski, A.S.
Powiązania:
https://bibliotekanauki.pl/articles/70561.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
nitric oxide
endothelin receptor
portal hypertension
oesophagus
oesophageal varix
endothelin-1
rat
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie psychrometru Peltiera do pomiaru potencjalu wody - prototyp przyrzadu pomiarowego
Autorzy:
Skierucha, W
Sobczuk, H.
Malicki, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/1402592.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
woda glebowa
potencjal wodny
przyrzady pomiarowe
termozlacza
psychrometr Peltiera
water soil
water potential
measurement device
thermocouple
Peltier psychrometer
Źródło:
Acta Agrophysica; 2001, 53; 125-134
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early and Middle Frasnian brachiopod faunas and turnover on the South China shelf
Autorzy:
Ma, X -P
Becker, R.T.
Li, H.
Sun, Y.-Y.
Powiązania:
https://bibliotekanauki.pl/articles/21029.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Early Frasnian
Middle Frasnian
Frasnian
paleontology
brachiopod fauna
South China shelf
Devonian
Brachiopoda
Cyrtospirifer
faunal turnover
Opis:
The first appearance of the brachiopod Cyrtospirifer and related forms in the Late Devonian of South China significantly postdates the beginning of the Frasnian and the entry of the group in other parts of the world. Scattered data from different sections suggest that its first entry, associated with the emergence of other plicate spiriferids, such as theodossid and conispiriferid brachiopods, was late in the Middle Frasnian. At the same time, many rhynchonellids disappeared or became extinct locally in South China. This brachiopod faunal overturn near the Palmatolepis punctata–Early Pa. hassi zonal boundary is the most significant event in the Early–Middle Frasnian of South China, characterized by about a 35% loss of existing species and the flourishing of the plicate spiriferids, which was coeval with the end of a major biogeochemical perturbation recently recognized in the Pa. punctata Zone. By contrast, atrypid brachiopods do not seem to show any significant diversity change. The brachiopod faunal change was probably related to a (local?) transgressive event in South China, which also brought new pelagic faunas northwards into some intra−shelf deeper water areas, such as the Shetianqiao area in central Hunan Province. Fifteen brachiopod species are described and illustrated, which include some taxa that are first recorded or recognized in South China, e.g., the spiriferid Pyramidaspirifer, which is now known from both North America and South China. One new species, Desquamatia qiziqiaoensis, is erected.
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 4; 789-812
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of hadronic rescattering on the elliptic flow after the hydrodynamics model
Autorzy:
Ma, G.
Ma, Y.
Sa, B.
Cai, X.
He, Z.
Huang, H.
Long, J.
Shen, W.
Zhong, Ch.
Chen, J.
Zuo, J.
Zhang, S.
Shi, X.
Powiązania:
https://bibliotekanauki.pl/articles/148372.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
elliptic flow
hydrodynamic model
hadronic rescattering
LUCIAE model
Opis:
Abstract A hydrodynamics + hadronic rescattering model is used to simulate Au+Au collisions at 200 GeV and a Cooper-Frye method is adopted for hadronization. The effect of hadronic rescattering on elliptic flow V2 in 20 40% Au+Au collisions at 200 GeV has been investigated. It is found that the hadronic rescattering can suppress elliptic flow V2 and makes an asymmetric system in momentum space tend to be less anisotropic. The suppression effect becomes weak with increasing transverse momentum. In addition, the effect of hadronic rescattering on transverse momentum spectra and anisotropy of hadronic coordinate space is presented.
Źródło:
Nukleonika; 2006, 51,suppl.3; 21-27
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the sustainable management framework and the economic value evaluation for Taiwan reservoir watershed
Badania struktury zrownowazonej gospodarki oraz ocena wartosci ekonomicznej zlewni zbiornikow wodnych na Tajwanie
Autorzy:
Lu, S -H
Peng, S.-H.
Ma, H.-W.
Powiązania:
https://bibliotekanauki.pl/articles/81829.pdf
Data publikacji:
2010
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
sustainable management
economic value
Taiwan
reservoir
watershed
valuation method
Opis:
Recently lack of sustainable management for the reservoir watershed becomes a predicament for the water issues in Taiwan. The study tried to recognize the framework of the sustainable management of the Taiwan reservoir watershed and its key factors by using the analytic hierarchy process and the Delphi method. Through the identification questionnaires and the CVM (contingent valuation method), it also discussed the gap of expert and public for the identification of satisfaction, environmental protection and the potential value for the recent reservoir watershed. However, the results showed that the “natural stability” is the significant factor in the first level and the “Nature resources conservation” and “Water storage amount” are the most important factors for the detailed level. In addition, the expert opinions were not proved by public identification, and the present governance budgets are too low to respond to the potential values of public expectancy.
W pracy przedstawiono wyniki badań przeprowadzonych dla określenia hierarchii ważności czynników ekologicznych, ekonomicznych i socjalnych związanych ze zrównoważonym zagospodarowaniem zlewni zbiorników wodnych na Tajwanie. W badaniach zastosowano metodę ankietową, w której respondenci stosując pięciostopniową skalę mieli wskazać ważność 22 określonych przez ekspertów czynników związanych z ochroną i zrównoważonym korzystaniem z zasobów środowiska, wpływających na standard życia mieszkańców oraz możliwości rozwoju gospodarczego na obszarze zlewni zbiorników wodnych. Stwierdzono, że najważniejsze znaczenie dla ludności mają czynniki ekologiczne, w szczególności zapewnienie stabilności przyrodniczej poprzez zachowanie bioróżnorodności oraz ochrony zasobów naturalnych, w tym ilości retencjonowanej wody.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2010, 42, 1; 219-225
0208-5771
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of littoral drift with adaptive neuro-fuzzy inference system
Ocena dryfu morskiego z wykorzystaniem systemu ANFIS [Adaptive Neuro-Fuzzy Inference System]
Autorzy:
Sabet, M S
Naseri, M.A.
Sabet, H.S.
Powiązania:
https://bibliotekanauki.pl/articles/81613.pdf
Data publikacji:
2010
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
littoral sand drift
coastal zone
adaptive neuro-fuzzy inference system
validation
physical process
database
Opis:
The amount of sand moving parallel to a coastline forms a prerequisite for many harbor design projects. Such information is currently obtained through various empirical formulae. Despite so many works in the past, an accurate and reliable estimation of the rate of sand drift has still remained a problem. It is a non-linear process and can be described by chaotic time-series. The current study addresses this issue through the use of Adaptive Neuro-Fuzzy Inference System (ANFIS). ANFIS is about taking an initial fuzzy inference system (FIS) and tuning it with a back propagation algorithm based on the collection of input-output data. ANFIS was developed to predict the sand drift from a variety of causative variables. The structure and algorithm of ANFIS for predicting the rate of sand drift is described. The Adaptive Neuro-Fuzzy Inference System was validated by confi rming its consistency with a database of specifi ed physical process.
W artykule przedstawiono adaptację systemu ANFIS do oceny wielkości dryfu fal piaskowych poruszających się wzdłuż wybrzeża morskiego. Pomimo wielu informacji o charakterze ilościowym oraz jakościowym zebranych w badaniach terenowych oraz opracowanych wzorów empirycznych opisujących analizowane zjawisko, autorzy widzą potrzebę stosowania symulacji zjawiska za pomocą metod numerycznych. Takie możliwości daje omówiony w pracy system ANFIS.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2010, 42, 1; 159-167
0208-5771
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new centrosaurine from the Late Cretaceous of Alberta, Canada, and the evolution of parietal ornamentation in horned dinosaurs
Autorzy:
Farke, A.A.
Ryan, M.J.
Barrett, P.M.
Tanke, D.H.
Braman, D.R.
Loewen, M.A.
Graham, M.R.
Powiązania:
https://bibliotekanauki.pl/articles/22176.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
In 1916, a centrosaurine dinosaur bonebed was excavated within the Campanian−aged deposits of what is now Dinosaur Provincial Park, Alberta, Canada. Specimens from this now−lost quarry, including two parietals, a squamosal, a skull missing the frill, and an incomplete dentary, were purchased by The Natural History Museum, London. The material was recently reprepared and identified herein as a previously unknown taxon, Spinops sternbergorum gen. et sp. nov. Based upon the available locality data and paleopalynology, the quarry lies in either the upper part of the Oldman Formation or the lower part of the Dinosaur Park Formation. The facial region of the partial skull is similar to putative mature specimens of Centrosaurusspp. and Styracosaurus albertensis, with short, rounded postorbital horncores and a large, erect nasal horncore. Parietal ornamentation is consistent on both known parietals and is unique among ceratopsids. Bilateral, procurved parietal hooks occupy the P1 (medial−most) position on the dorsal surface of the parietal and are very similar to those seen in Centrosaurus apertus. Epiparietals in the P2 or possibly P3 position (lateral to P1) manifest as extremely elongate, caudally directed spikes, unlike the condition in C. apertus, S. albertensis, or any other “derived” centrosaurine. Cladistic analysis suggests that S. sternbergorum is closely related to Centrosaurus and Styracosaurus. Historically, based upon the condition in Styracosaurus and related centrosaurines, it was assumed that the medial−most elongated spikes on centrosaurine parietals correspond to the P3 epiparietal position. The exception illustrated in the new taxon suggests that homologies of epiparietals among basal centrosaurines (e.g., Albertaceratops and Diabloceratops) and derived centrosaurines (e.g., Styracosaurus and “pachyrhinosaurs”) should be reconsidered. The medially−placed, caudally−directed “P3” process of basal centrosaurines may, in fact, be homologous with P2.
Źródło:
Acta Palaeontologica Polonica; 2011, 56, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identyfikacja stanu sektora biopaliw jako czynnika stymulującego rozwój gospodarstw rolnych i przedsiębiorstw agrobiznesu
Identification of the biofuels sector state as a factor stimulating the development of farms and agribusiness enterprises
Autorzy:
Jerzak, M.A.
Lakowski, H.S.
Powiązania:
https://bibliotekanauki.pl/articles/865241.pdf
Data publikacji:
2011
Wydawca:
The Polish Association of Agricultural and Agribusiness Economists
Opis:
Sektor biopaliw w Polsce znajduje się w początkowej fazie swej aktywności produkcyjnej. Makrootoczenie sektora i fundamentalny, znaczący wpływ przepisów fiskalno-prawnych regulujących działalność podmiotów w branży biopaliw transportowych oraz sytuacja polityczna i jej międzynarodowy charakter, decydują o kierunku rozwoju branży w świetle rosnącej świadomości ekologicznej. Ze względu na ekonomiczne uwarunkowania produkcja biopaliw jest mało opłacalna, w związku z tym wspierana jest różnorakimi prorozwojowymi narzędziami administracyjnymi.
Poland has introducedfiscal and legal regulations that oblige enterprises to use admixture of biofuels in petrol and diesel oil - National Indicator Goal. Therefore, the demand for oilseed rape is high, and there is a growing demand for bio-components used in producing liąuidfuels. Biofuels sector in Poland is developing very dynamically, even though for companies specializing in the production of biofuels, the fiscal and legal regulations are one of the most important factors governing the activity of entities in the sector.
Źródło:
Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu; 2011, 13, 2
1508-3535
2450-7296
Pojawia się w:
Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Precise and High Speed Charge-Pump PLL Model Based on SystemC/SystemC-AMS
Autorzy:
Ma, K.
Van Leuken, R.
Vidojkovic, M.
Romme, J.
Rampu, S.
Pflug, H.
Huang, L.
Dolmans, G.
Powiązania:
https://bibliotekanauki.pl/articles/227120.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SystemC/SystemC-AMS
phase locked loop PLL
radio frequency
mixed-signal modeling
hardware description language
Opis:
The Phase Locked Loop (PLL) has become an important part of electrical systems. When designing a PLL, an efficient and reliable simulation platform for system evaluation is needed. However, the closed loop simulation of a PLL is time consuming. To address this problem, in this paper, a new PLL model containing both digital and analog parts based on SystemC/SystemC-AMS (BETA version) is presented. Many imperfections such as Voltage Control Oscillator (VCO) noise or reference jitter are included in this model. By comparing with the Matlab model, the SystemC/SystemC-AMS model can dramatically reduce simulation time. Also, by comparing with Analog Devices ADI SimPLL simulation results, Cadence simulation results and real measurement results, the accuracy of the SystemC/SystemC-AMS model is demonstrated. The paper shows the feasibility of a unified design environment for mixed-signal modelling based on SystemC/SystemC-AMS in order to reduce the cost and design time of electrical systems.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 3; 225-232
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DFIS: A novel data filling approach for an incomplete soft set
Autorzy:
Qin, H.
Ma, X.
Herawan, T.
Zain, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/331284.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
zbiór rozmyty
napełnianie danych
soft sets
incomplete soft sets
data filling
association degree
Opis:
The research on incomplete soft sets is an integral part of the research on soft sets and has been initiated recently. However, the existing approach for dealing with incomplete soft sets is only applicable to decision making and has low forecasting accuracy. In order to solve these problems, in this paper we propose a novel data filling approach for incomplete soft sets. The missing data are filled in terms of the association degree between the parameters when a stronger association exists between the parameters or in terms of the distribution of other available objects when no stronger association exists between the parameters. Data filling converts an incomplete soft set into a complete soft set, which makes the soft set applicable not only to decision making but also to other areas. The comparison results elaborated between the two approaches through UCI benchmark datasets illustrate that our approach outperforms the existing one with respect to the forecasting accuracy.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 4; 817-828
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jurassic rhynchonellide brachiopods from the Jordan Valley
Autorzy:
Feldman, H.R.
Schemm-Gregory, M.
Ahmad, F.
Wilson, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/23239.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Jurassic
rhynchonellid brachiopod
brachiopod
Jordan Valley
Brachiopoda
Rhynchonellida
Mughanniyya Formation
Opis:
Jurassic rhynchonellide brachiopods from the Jordan Valley are herein revised and new taxa are added to the faunal list. In this study of Jurassic rhynchonellides from Wadi Zarqa, northwestern Jordan, we recognize the following taxa: Eurysites rotundus, Cymatorhynchia quadriplicata, Daghanirhynchia triangulata, D. angulocostata, Pycnoria magna, Schizoria elongata, and Schizoria cf. intermedia. The following new taxa are described: Daghanirhynchia susanae sp. nov. and Amydroptychus markowitzi sp. nov. The Middle Jurassic Mughanniyya Formation of northwest Jordan is dominated by limestone beds. The sedimentary environment is interpreted as neritic, light, and nutrient−rich resulting in high faunal diversity. The high rhynchonellide endemism of this fauna is yet another confirmation of pronounced Middle Jurassic endemism along the southern Tethyan margin of the Ethiopian Province. Brachiopods of the Jordanian Mughanniyya Formation can be correlated with the fauna of the Aroussiah Formation in Sinai and the Zohar and Matmor formations in Southern Israel.
Źródło:
Acta Palaeontologica Polonica; 2012, 57, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
What if they are not weld-able?
Autorzy:
Zhang, H.
Jayatissa, A. H.
Durbin, S.
Ma, G.
Powiązania:
https://bibliotekanauki.pl/articles/407437.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hybrid mechanical joining
friction stir welding
riveting
magnesium
aluminum
Opis:
Many light metals, such as aluminum and magnesium alloys, are promised to provide significant weight reduction for automobiles. However, the difficulties in welding these metals seriously hinder their large-scale applications. A new, hybrid mechanical joining process is proposed to avoid the inherited metallurgical complications in welding. By spinning and pressing a solid rivet into the metals, a joint is formed with the locking from the rivet, a stirred/mixed zone around the rivet, and solid bonding at the faying interface. This riveting process combines the actions of friction-stir welding in which metals of difierent sheets are mechanically mixed, and self-piercing riveting process which embeds a rivet in the sheets. Experiments have shown that such a friction-stir riveting process can produce joints of comparable strength to those created by other joining means, and can be applied to dififcult-to-weld metals and dissimilar metals, such as aluminum-to-aluminum, magnesium-to-magnesium, and aluminum-to-magnesium.
Źródło:
Management and Production Engineering Review; 2012, 3, 3; 86-91
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Xerophiles and other fungi associated with cereal baby foods locally produced in Uganda
Autorzy:
Ismail, M.A.
Taligoola, H.K.
Nakamya, R.
Powiązania:
https://bibliotekanauki.pl/articles/67513.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
fungi
cereal product
baby food zob.child food
child food
food product
production
Uganda
xerophilic fungi
mycobiota
spoilage
contamination
Opis:
Fifty samples from five baby food products mainly made of cereal flour(s) were analyzed. The moisture contents of these products were between 11.14% and 11.9%, a level below 14.0%, the recommended level for safe storage of cereal grains and their products. The mycological analysis was carried out using the dilution plate method and two isolation media (DG18 for isolation of xerophilic fungi and DRBC for fungi in general). A total of 80 species related to 37 genera in addition to some unidentified fungal and yeast species were recorded on both media from the five products. The products were contaminated abundantly by xerophilic fungi which were occurring in 88% of food samples and accounting for 18.1% of the total CFU as recorded on DG18. The highest contamination level by xerophiles was registered in Mwebaza rice porridge (a component of rice flour) and the lowest in Mukuza (a product of maize, soyabean and sorghum flours). 11 xerophilic species were recorded of which Aspergillus and Eurotium (4 species each) were the predominant giving rise to 9.1% and 8.9% of the total CFU, with A. wentii, A. candidus, E. cristatum and E. repens were the most contaminating species. Of the fungi recorded other than xerophiles, species of Aspergillus (particularly A. flavus followed by A. niger), Penicillium (P. citrinum, P. oxalicum), Fusarium (F. solani, F. tricinctum), Cladosporium (C. sphaerospermum) and yeasts were the most predominant. Contamination of such foods is a matter of health hazard as these foods are for babies. So, the use of fresh, well-dried and uncontaminated flours for production of such foods is recommended.
Źródło:
Acta Mycologica; 2012, 47, 1
0001-625X
2353-074X
Pojawia się w:
Acta Mycologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control system design for multi-rotor MAV
Autorzy:
Wang, W.
Ma, H.
Sun, C.-Y.
Powiązania:
https://bibliotekanauki.pl/articles/280407.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
MAV
attitude control
altitude control
LQG
memory based control
Opis:
Abstract MAVs (Micro Air Vehicles) have attracted more and more attention in recent years because of their wide applications, such as investigations of inhospitable environment, nuclear or hazardous material polluted regions and other inaccessible areas. In this paper, both attitude and altitude controls of a Quad-Rotor type MAV are discussed and analyzed. To stabilize the attitude, one order memory based controller is selected, the performance of which is independent of the detail model information, leading to enhanced robustness. While for the altitude, a Linear Quadratic Gaussian (LQG) controller is proposed. The experimental results of the real flight demonstrate the stability and robustness of the controllers.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 1027-1038
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 101

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