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    Wyświetlanie 1-8 z 8
    Tytuł:
    Critical Level of Extractable Phosphorus for Maize (Zea mays L.) at Metekel Zone, Northwestern Ethiopia
    Autorzy:
    Redi, Musefa
    Gebremedhin, Wubayehu
    Merkeb, Fitsum
    Yimam, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/1191209.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Critical level
    fertilizer
    phosphorous
    maize
    soil test
    extraction methods
    Opis:
    Fertilizer recommendation based on choosing an effective soil nutrient extractants and calibrating soil tests against yield responses to applied nutrient has been little used in Ethiopia. An experiment was conducted during 2009, 2010 and 2011 cropping seasons in 35 different farmer fields from five Districts of Metekel zone. Six levels of phosphorus (0, 10, 20, 30, 40 and 50 kg ha-1) arranged in Randomized Complete Block Design (RCBD) with three replicates were used to determine the critical level of phosphorus (P) for maize and to compare Bray II, Olsen and Mehlich III P extraction methods. Grain yield of maize responded positively and significantly to P fertilizer application of the study area. Compared with the control, grain yield increased 19.8 to 35.3% by applications of P fertilizers. Extractable P concentration extracted after three weeks of planting by using three extraction methods were significantly differed among P fertilizer rates. Using the Cate and Nelson graphical method, the critical levels of soil extractable P were 12, 8 and 10 mg P kg-1 soil for Bray II, Olsen and Mehilich III extraction methods, respectively. Results shows that at values less than these critical levels of extractable P, P fertilizers should be applied to increase maize yield. The Bray II P was more correlated (r = 0.38) with relative maize grain yield than and Olsen and Mehlich III extraction methods. In addition, the quantities of P extracted by the three extractants were in the following order: Bray II > Mehlich III > Olsen P extraction method. The result indicated that Bray II was found to be the most suitable as soil testing method for estimating extractable P in the study area.
    Źródło:
    World Scientific News; 2016, 54; 14-26
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An approach in determining the critical level of degradation based on results of accelerated test
    Autorzy:
    Hoang, Anh D
    Vintr, Zdenek
    Valis, David
    Mazurkiewicz, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2087014.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    critical level
    threshold of degradation process
    accelerated test
    LED
    Wiener process
    Opis:
    Nowadays, systems are more complex and require high reliability for their components, especially critical system components. Therefore, to avoid serious damage, system are often replaced before the actual failure. The replaced parts are considered to have “soft failure”, and the limit in which the parts are replaced is known as the critical level of the degradation process. Determining the appropriate value of the critical level for a product is an important problem in their exploitation, as well as for predicting the Mean Time to Failure (MTTF) or Remaining Useful Lifetime (RUL) of this product based on the degradation data by the mathematical models. In this article, an approach in determining the critical levels based on failure data from an accelerated test is introduced. This approach is applied with the degradation process of Light-Emitting Diodes (LED) in an accelerated test and a type of Wiener process-based model is used to predict the MTTF or RUL of LED based on their degradation data and the found critical level.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 2; 330--337
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ozone effects on trees, where uptake and detoxification meet
    Autorzy:
    De, Temmerman L
    Vandermeiren, K.
    D'Haese, D.
    Bortier, K.
    Asard, H.
    Ceulemans, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/41371.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    air pollutant
    ozone effect
    oxidative defence
    detoxification
    ozone
    critical level
    tree
    ozone concentration
    effective ozone flux
    Opis:
    Ozone is the most important air pollutant and its concentration in ambient air is still rising. Ozone concentrations measured at reference height (50 m is EMEP ozone modelling height), do not reflect the real concentration at the top of the vegetative canopy and do not provide sufficient information about the ozone fluxentering the leaves. Modelling stomatal conductance is leading to estimations of cumulative ozone uptake and enables much better to evaluate the impact of ozone on trees. The negative impact of ozone exposure has a measurable effect on physiological processes such as stomatal conductance, photosynthesis and respiration. Disturbance of the basic physiological processes is leading to growth and wood production losses. There have been several attempts to establish critical levels (CL) for ozone effects on forest trees. Average concentrations and cumulative exposure indices are satisfactory to some extent, but do not fully describe the potential impact of ozone exposure. Much more promising is an evaluation based on the effective ozone flux, which is a function of the absorbed ozone flux and the defensive response. Ozone uptake takes place primarily through the stomata and reactions of ozone with hydrocarbons released by the plant cells and transformations of dissolved ozone in the apoplastic fluid create many reactive oxygen species of which free radicals are able to initiate membrane lipid peroxidation and destruction of cell membranes. The defence of a plant against absorbed ozone starts in the apoplastic fluid. Ascorbate is believed to be a very important radical scavenger avoiding detrimental effects of reactive oxygen species to the membranes. Other important antioxidants are phenolics. The defensive response can be linked to the abundance of ascorbate or the ability of the plants to regenerate (reduce) ascorbate from monodehydroascorbate and dehydroascorbate. The reduction of dehydroascorbate takes place in the symplast where ascorbate can be transported back through the plasma membrane into the apoplast. Ozone exposure also causes oxidative stress of the plant cell interior by the formation of reactive oxygen species. Plants can cope with those toxic substances in the symplast by using antioxidants such as ascorbate, -tocopherol, glutathione and carotenoids and enzymes such as superoxide dismutases, catalases and several peroxidases. The complexity of the apoplastic and symplastic antioxidative capacity with different turnover rates and transport of antioxidants makes it difficult to determine the total antioxidative power.
    Źródło:
    Dendrobiology; 2002, 47
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Present day school readers in rapport with the dramatic works of a once-banned Albanian author
    Autorzy:
    Shingjergji, Besa
    Ciftja, Hektor
    Powiązania:
    https://bibliotekanauki.pl/articles/628101.pdf
    Data publikacji:
    2013
    Wydawca:
    Fundacja Pro Scientia Publica
    Tematy:
    school-level reader, banned author, classical tragedian, author’s re-appraisal, critical thinking, and complex messages.
    Opis:
    The process of reading, rereading, scrutinizing, re-scrutinizing and appraising an author’s work is not fi nite; moreover it is very dynamic and full of suprises. No doubt that the appraisal and re-appraisal is too complex, including cultural, literary, gender and genre components. This becomes more obvious when referring to an author whose works had been locked up in library stacks during the whole 45 years of totalitarian rule in Albania, and whose appraisal process cannot help facing up to the critical thinking led by biased politicization. In this study the appraisal of the works of one of the most outstanding Albanian writers of the 30s of the twentieth century, Etëhem Haxhiademi, will be done by presenting them in rapport with the present-day school, pre-university and university level readers. This re-appraisal is conducted with a cold logic, devoid of the vindictive political principles which brought the distorted evaluation of the authors’ works, as it happened for many other au-thors as well, and is striving to place the writer into the system of the genuine literary values. Once the reader’s inquisitiveness has been satisfi ed, even after reading a less-known or, moreover, an oblivious or banned literary work, he/she begins reading and rereading it, looking closely into it, essaying to fi nd a proper place for this work in the general system of the national, inter-balkanic and international literary values.E. Haxhiademi’s literary work was known by an older generations of readers whose es-thetic satisfaction it brought forth was confi ned in their consciousness: it was unknown or partly known, not by direct reading but by several interpretations of others, by a middle generation of readers who displayed a certain artistic uncertainty and indifference. However, nowadays it is intently being studied although in excessively fragmentary ways and in many cases even unsuitable ones, by the younger generation of readers who should have a more motivated curiosity for divulging its real values.In the history of the Albanian literature, as well as in the other East European Countries, the authors’ biographies and especially their political aspects, were used as selective criteria to appraise authors and their works, instead of being pure cognitive and studying means. This study intends to reveal the present-day school readers’ affi rmative attitudes or even the non-affi rmative ones, regarding Haxhiademi’s literary works, in the process of re-dimen-sioning the author’s values and those of his literary works.
    Źródło:
    Journal of Education Culture and Society; 2013, 4, 1; 257-266
    2081-1640
    Pojawia się w:
    Journal of Education Culture and Society
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sustainable competitive advantage (SCA) analysis of furniture manufacturers in malaysia: normalized scaled critical factor index (NSCFI) approach
    Autorzy:
    Tasmin, R.
    Takala, J.
    Abu Bakr, A. A.
    Shylina, D.
    Nizialek, D.
    Che Rusuli, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/407401.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sustainable competitive advantage
    SCA model
    SCA risk level
    critical factor index
    CFIs method
    operation strategy index
    Opis:
    The purpose of this paper is to investigate Malaysian furniture industry via Sustainable competitive advantages (SCA) approach. In this case study, sense and respond method and Normalized Scaled Critical Factor Index (NSCFI) are used to specify the distribution of companies’ resources for different criteria and detect the attributes which are critical based on expectation and experience of companies’ employs. Moreover, this study evaluates Malaysian furniture business strategy according to manufacturing strategy in terms of analyzer, prospector and defender. Finally, SCA risk levels are presented to show how much company’s resource allocations support their business strategy. This case study involved four furniture manufacturing companies, in the southern part of Peninsular Malaysia to provide the overall view of their strategies in the perspective of knowledge & technology management, processes & work flows, organizational, and information systems. Hence, the findings of this study presented the preliminary results from these furniture companies in Malaysia, which are involved in sustainable competitive advantage (SCA) studies in terms of expectation and experience, NSCFI, operational strategy triangle of prospector (P), defender (D), and analyzer (A). The result shows that almost all furniture companies are categorized into the Analyzer type strategy and planning to remain being Analyzer in future to come.
    Źródło:
    Management and Production Engineering Review; 2016, 7, 2; 73-85
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of different potassium fertilization level on nutritional status of winter wheat and on yield during critical growth stage
    Wplyw zroznicowanego poziomu nawozenia potasem na stan odzywienia w krytycznej fazie wzrostu i plonowanie pszenicy ozimej
    Autorzy:
    Gaj, R
    Powiązania:
    https://bibliotekanauki.pl/articles/13925.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    plant fertilization
    potassium fertilization
    fertilization level
    nutritional status
    wheat
    winter wheat
    yield
    critical stage
    growth stage
    shooting
    Opis:
    An optimum plant crop nutrition status during critical stages of growth is one of the most important factors shaping their ability to yield. It has been assumed that plant nutrition during the spring wheat stem elongation stage has a significant influence on the growth and yield of this crop. In Poland, potassium is a critical nutrient for plant growth and yielding. In order to verify this hypothesis, three series of one factorial experiment were conducted in 2003-2005 that involved reduced rates of potassium applied to cv. Zyta winter wheat. The following rates of potassium were applied: 0, 25, 50 and 100 kg ha–1. The assessment of wheat nutritional status was conducted at the beginning of stem elongation (BBCH30/31) using a German model called PIPPA. It had been hypothesized that this particular stage was decisive for wheat growth and yielding. Wheat plants showed deficiency in Ca, K, P and N irrespective of the applied potassium rate. Calcium and potassium deficiencies were crucial for the final grain yield. However, the relationships that occurred between nitrogen and main nutrients, i.e. pairs of nutrients such as N: P, N: K, N: Ca, showed a much better prognostic value, i.e. the relationship with grain yield, than the levels of nutrients in separation. The nitrogen content in leaves at the beginning of shooting showed its limiting effect on grain yield, provided that Ca was deficient, an event which appeared when N: Ca was wider that 34: 1. The same correlation was noticed for potassium, but there the excess of nitrogen revealed its harmful effect when the N:K ratio was above 1.0.
    Optymalne odżywienie roślin uprawnych w krytycznych fazach wzrostu jest jednym z najważniejszych czynników realizacji ich potencjału plonotwórczego. Przyjęto założenie, że odżywienie roślin w fazie BBCH31 istotnie wpływa na wzrost i plonowanie pszenicy. W Polsce składnikiem krytycznym dla wzrostu i plonowania roślin uprawnych jest potas. Celem sprawdzenia tej hipotezy w latach 2003-2005 przeprowadzono 3 serie jednoczynnikowych doświadczeń polowych ze zróżnicowanymi dawkami potasu stosowanymi w uprawie pszenicy ozimej odmiany Zyta. Potas aplikowano w dawkach: 0, 25, 50 i 100 kg ha–1. Stan odżywienia pszenicy ozimej oceniano na początku strzelania w źdźbło (BBCH31) na podstawie niemieckiego programu PIPPA. Rośliny, niezależnie od zastosowanej dawki potasu, wykazały stan niedożywienia Ca, K, P i N. Niedobory wapnia i potasu okazały się kluczowe dla kształtowania plonu ziarna. Jednakże relacje między zawartościami dla par składników: N : P, N : K oraz N: Ca wykazały znacznie większą wartość prognostyczną, czyli związek z plonem ziarna, niż zawartości składników rozważane oddzielnie. Nadmiar azotu w liściach w fazie początku strzelania w źdźbło wykazał ujemny wpływ na plon ziarna w warunkach niedoboru wapnia, który ujawnił się dopiero dla N:Ca > 34. Tę samą prawidłowość zanotowano dla potasu, lecz nadmiar azotu ujawnił swe hamujące działanie, gdy stosunek N:K przyjął wartości większe od 1,0.
    Źródło:
    Journal of Elementology; 2010, 15, 4; 629-637
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analyses of safety-related message transmission
    Autorzy:
    Rástočný, K.
    Franeková, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/393641.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    poziom nienaruszalności bezpieczeństwa
    błędy komunikacji
    system transmisji
    mechanizm bezpieczeństwa
    safety-critical applications
    safety integrity level
    communication errors
    closed transmission system
    safety mechanisms
    ratio counter
    probability of undetected error
    Opis:
    The analyses were aimed at determination of failure effects in the transmission system, which allow identifying the transition process of the system from a safety state (it may not be necessarily a failure - a free state) to a dangerous state and permit to calculate probability of the dangerous state occurrence of the system as a failure effect to the operating system. Dangerous states of the safety Fieldbus system are mainly caused by systematic failures within a specification of the system, electromagnetic interferences (EMI) and random failures of the HW effects. The effects of electromagnetic interferences and random failures of HW can be described in the paper by the use of time table.
    Źródło:
    Archives of Transport System Telematics; 2009, 2, 3; 22-26
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cyberbezpieczeństwo zarządzania sieciami i partycjami w transporcie kolejowym
    Autorzy:
    Procházka, Jan
    Novobilsky, Petr
    Procházkova, Dana
    Powiązania:
    https://bibliotekanauki.pl/articles/2091297.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Kolejnictwa
    Tematy:
    system cyberfizyczny
    infrastruktura krytyczna
    systemowo wielopoziomowe przetwarzanie danych
    bezpieczne przetwarzanie danych
    niezależne przetwarzanie danych
    MILS
    cyber physical system
    critical infrastructure
    system-wide multi-level data processing
    secure data processing
    independent data processing
    Opis:
    Infrastruktura transportu kolejowego zapewnia codzienny przewóz dużej liczby osób i ładunków. Znaczenie kolei pod względem zapewnienia sprawności obsługi na danym obszarze czyni z niej infrastrukturę krytyczną. Obserwuje się istotny rozwój wykorzystania technologii informatycznych na kolei, podobnie jak we wszystkich innych branżach. Z tego względu zarządzanie koleją, jako systemem fizycznym, należy zastąpić zarządzaniem koleją, jako systemem cyberfizycznym. Infrastruktura kolejowa jest narażona na znaczące ataki zarówno w przestrzeni fizycznej, jak i w cyberprzestrzeni. Artykuł jest poświęcony zarządzaniu sieciami komunikacyjnymi, służącymi do transmisji danych i partycjami, rozumianymi jako logicznie wydzielone zasoby informatyczne (służące do przetwarzania danych), wykorzystywanymi na potrzeby transportu kolejowego. Systemowo, wielopoziomowe, bezpieczne i niezależne (ang. System Multiple Independent Levels of Security – MILS) przetwarzanie danych spełnia wysokie wymagania dotyczące bezpieczeństwa systemu. MILS jest niezawodną architekturą bezpieczeństwa opartą na koncepcji separacji i kontrolowanego przepływu danych. W artykule opisano możliwości wykorzystania platformy MILS w systemie teleinformatycznym i systemie sterowania ruchem kolejowym.
    Źródło:
    Problemy Kolejnictwa; 2020, 189; 57--64
    0552-2145
    2544-9451
    Pojawia się w:
    Problemy Kolejnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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