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Wyświetlanie 1-15 z 21
Tytuł:
An experimental analysis of performance and exhaust emissions of a CRDI diesel engine operating on mixtures containing mineral and renewable components
Autorzy:
Duda, Kamil
Wierzbicki, Sławomir
Mikulski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/132854.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
exhaust emissions
common rail
biodiesel
animal fat biodiesel
combustion analysis
emisje spalin
biodiesel z tłuszczu zwierzęcego
analiza spalania
Opis:
The manuscript presents a comparative analysis of the performance and emission characteristics of a compression ignition engine equipped with a Common Rail injection system. The engine is fueled with diesel-biodiesel mixtures containing 25% and 50% share (by volume) of renewable components. Conventional diesel is used as a reference. Turkey lard and rapeseed oil are used as raw materials and subjected to the single-stage transesterification process to obtain methyl esters. The experiments are performed on a medium-duty, turbocharged, inter-cooled, Common Rail Direct Injection (CRDI) diesel engine. This study concentrates on one engine speed of 1500 rpm, typical for gen-set applications, and mid-load range from 100 Nm to 200 Nm. The scope of measurements covers the analysis of exhaust gasses concentration and engine efficiency parameters. In addition, the in-cylinder pressure measurements are performed in order to provide insight into the differences in combustion characteristics between examined fuel mixtures. The study reveals that the addition of the renewable component to fuel mixture positively affects a number of examined performance parameters as well as de-creases the concentration of the examined toxic exhaust components, in the majority of cases.
Źródło:
Combustion Engines; 2019, 58, 4; 27-31
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of potential improvements in the performance of solenoid injectors in diesel engines
Autorzy:
Vrublevskyi, Oleksandr
Wierzbicki, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/27312775.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
diesel engine
solenoid injector
solenoid valve
electromagnetic circuit
Opis:
Efficient fuel injection and exhaust gas cleaning systems are needed to promote the development of high-performance internal combustion systems and decrease greenhouse gas emissions. Electronically controlled injection systems enable nearly unlimited control over system components whose operation is limited by the inertia of moving parts and other physical phenomena. In the present study, a novel technology for manufacturing magnetic cores was proposed to improve the performance of solenoid injectors in Diesel engines. The conducted simulations and experiments revealed that the developed technology can increase the speed of solenoid injectors. In the proposed solution, the fuel dose was split to effectively control the injection process and improve engine performance.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 3; art. no. 166493
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the share of natural gas in the total fuel supply dose on the combustion process in a CRDI engine
Autorzy:
Wierzbicki, Sławomir
Boruta, Grzegorz
Konieczny, Łukasz
Łazarz, Bogusław
Powiązania:
https://bibliotekanauki.pl/articles/2098083.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
CNG
Common Rail
dual-fuel engine
course of combustion
heat release
silnik dwupaliwowy
przebieg spalania
wydzielanie ciepła
Opis:
Natural gas is one of the potential combustion engine fuels whose proportion in the overall energy balance is expected to increase. Owing to some of its properties, its use requires a dual-fuel supply system; thus, the use of natural gas as a fuel for diesel engines is currently limited. Systems that supply gas fuel to diesel engines do not usually interfere with the engine control system. This solution significantly reduces system-installation costs. However, as demonstrated in the present study, it considerably changes the course of the combustion process, which increases thermal and mechanical loads. In this case, the combustion process can be controlled by changing the liquid fuel injection pressure or advancing the injection angle. This, however, requires interference with the engine control system.
Źródło:
Transport Problems; 2021, 16, 1; 141--150
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania stalowych elementów i konstrukcji podpór linii elektroenergetycznych
Experimental tests of the steel members and structures of the overhead electrical lines supports
Autorzy:
Barcewicz, Wioleta
Labocha, Sławomir
Wierzbicki, Stanisław
Giżejowski, Marian
Powiązania:
https://bibliotekanauki.pl/articles/2064182.pdf
Data publikacji:
2022
Wydawca:
PWB MEDIA Zdziebłowski
Opis:
W artykule przedstawiono zarys badań doświadczalnych całych konstrukcji stalowych kratowych podpór linii elektroenergetycznych, a także wydzielonych sekcji oraz izolowanych elementów z węzłami śrubowymi. Badania elementów i ich połączeń dotyczyły rozciąganych kątowników łączonych jednym ramieniem oraz kształtowników profilowanych na zimno poddanych ściskaniu. Badania były realizowane przez firmę ENPROM i Wydział Inżynierii Lądowej Politechniki Warszawskiej w ramach projektu Narodowego Centrum Badań i Rozwoju.
This article presents an outline of experimental investigations of entire structures of steel lattice supports of the overhead electrical lines, as well as separate substructures and isolated elements tested together with their bolted end joints. Tension angles connected by one leg and cold-formed sections subjected to compression were considered. The experimental work was carried out by the ENPROM company and the Faculty of Civil Engineering of the Warsaw University of Technology as part of the project of the National Centre for Research and Development.
Źródło:
Builder; 2022, 26, 5; 36--38
1896-0642
Pojawia się w:
Builder
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emissions from a medium-duty CRDI engine fuelled with diesel-biodiesel blends
Autorzy:
Duda, Kamil
Wierzbicki, Sławomir
Mikulski, Maciej
Konieczny, Łukasz
Łazarz, Bogusław
Letuń-Łątka, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2203846.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
biodiesel
fuel blending
exhaust emissions
common-rail
engine efficiency
mieszanie paliw
emisja spalin
common rail
sprawność silnika
Opis:
In the present work, biofuels produced from different raw fatty materials have been proposed as a dominant fuel component in biodiesel-diesel fuel blends. Biofuels were produced from pork lard and rapeseed oil by alkali transesterification using methyl alcohol. Blends of biofuels in volumetric proportions of 60 and 80% of the biocomponent and the remaining part of the conventional fuel were used in a compression ignition engine designed for medium-duty vehicles. The experiments were conducted at two engine rotational speeds (1500 and 3000 rpm, respectively) and a set of load conditions (50, 100, and 200 Nm, respectively). The tests focused on engine efficiency parameters (brake-specific fuel consumption and brake fuel conversion efficiency) as well as exhaust gas emissions (hydrocarbons, carbon monoxide, and carbon dioxide were determined). The obtained results indicate that blends containing biocomponents produced from pork lard were characterized by superior fuel consumption and efficiency results, compared to blends containing biocomponents produced from rapeseed oil. In terms of exhaust emissions, biocomponents produced from pork lard were also characterized by lower emission of all of the examined components compared to rapeseed methyl ester-diesel blends. This study proposes that fuel components obtained from custom (animal) raw-fatty material can be an effective substitute for commonly used rapeseed oil methyl esters.
Źródło:
Transport Problems; 2021, 16, 1; 39--49
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the effectiveness of on-board diagnostic systems in controlling exhaust gas emissions from motor vehicles
Ocena efektywności systemu diagnostyki pokładowej pojazdów samochodowych w aspekcie ochrony środowiska
Autorzy:
Wierzbicki, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/329168.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
on-board diagnostic system
certification test
control system
exhaust gas emissions
system diagnostyki pokładowej
test homologacyjny
układ sterujący
emisja spalin
Opis:
Toxic exhaust gas emissions from internal combustion engines pose the key barrier to vehicle development. Direct measurements of emission levels and toxic compounds present in exhaust gas pose a technical challenge, which is why vehicle emissions are determined by monitoring the parameters of various systems and components. On-board diagnostic systems support engine monitoring in real time. Most onboard diagnostic systems are standardized, therefore their functions can be modified relatively easily. This paper analyzes the functions of the existing on-board diagnostic systems and proposes solutions that prevent unauthorized tampering with vehicle emission systems.
Problem emisji związków toksycznych przez silniki spalinowe jest obecnie podstawową barierą rozwoju pojazdów samochodowych. Z uwagi na trudne technicznie do realizacji metody bezpośredniego określania poziomu rzeczywistej emisji poszczególnych związków toksycznych, poziom ich emisji przez pojazdy samochodowe w warunkach eksploatacji określa się na podstawie monitorowania parametrów pracy poszczególnych układów/elementów. Stosowane obecnie w pojazdach samochodowych systemy diagnostyki pokładowej z jednej strony pozwalają na bieżącą kontrolę pracy silnika, a z drugiej strony zaś ze względu na znormalizowaną zasadę działania pozwalają na relatywnie prostą ingerencję w ich działanie. W artykule dokonano analizy funkcjonowania obecnie stosowanych pokładowych systemów diagnostycznych oraz zaproponowano kierunki ich rozwoju pozwalające na ograniczenie ingerencji w ich działanie.
Źródło:
Diagnostyka; 2019, 20, 4; 75-79
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overview of Military Operations of US Arms Forces During the First Gulf War
Autorzy:
Wierzbicki, Sławomir
Mazurczak, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/1179693.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
George H. Bush
Gulf War
Iraq
Saddam Hussein
US Forces
Opis:
The purpose of this papers is analysis for military actions conducted by US Arms Force during Desert Storm operation in Iraq. This concern gives insight into new US attempt for military operations outside national borders following conclusions from unsuccessful military campaign in Vietnam. After 1989, US made more brave political decisions for participation in solving worldwide concerns. Origin for such state of affairs was gradual “Soviet Imperium breakdown”, that was general challenge for American foreign policy and safety. The United States began introducing New World Order vision in last decade of the twentieth century, that was created by G.H. Bush. American army obtained the role of executor in the performance of settled assumptions. The first military test was Saddam Hussein and Iraq.
Źródło:
World Scientific News; 2017, 72; 242-247
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soldier’s Morale as a Chance for Winning the Military Conflict
Autorzy:
Wierzbicki, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1179748.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Morale
Soldier’s
battlefield
military
war
Opis:
This papers presents the analysis for the phenomenon of soldier’s morale. Construction of papers provides the opinion of the representatives of the strongest arms force in the world - the United States of America. The vision of American analysts, scientific researchers and military theoreticians is presented in this papers. There are also provided practical examples. The purpose of this analysis is instructing that the morale phenomenon, as a component of soldier’s preparation to the conditions of contemporary battlefield, plays important role in military effectiveness of army and in future victories at time of war.
Źródło:
World Scientific News; 2017, 72; 358-363
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sovereignty and the globalization and universalization processes of the contemporary world
Autorzy:
Wierzbicki, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1179323.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
globalization
international policy
international relations
sovereignty
universalization
Opis:
One of the most characteristic features of the international environment is changeability, in which relations occur between individual its actors. Over the millennia these transformations occurred in different dimensions and levels, as well as in heterogeneous time intervals. Some of them had evolutionary nature and took place gradually, other whereas were more dynamic, often on the basis of sudden changes or revolution, bringing usually a particular kind of implications. In current international reality, relating to all transformations in the world, in a determined way stands out globalization
Źródło:
World Scientific News; 2017, 78; 63-68
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STRUKTURA, ORGANIZACJA I FORMOWANIE III BRYGADY LEGIONÓW POLSKICH
STRUCTURE, ORGANIZATION AND FORMING THE POLISH THIRD BRIGADE
Autorzy:
Damian Siebieszuk, Sławomir Wierzbicki, Damian Siebieszuk, Sławomir Wierzbicki
Powiązania:
https://bibliotekanauki.pl/articles/540560.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
LEGIONY POLSKIE
III BRYGADA
4. PUŁK PIECHOTY
6. PUŁK PIECHOTY
KOMENDA LEGIONÓW POLSKICH
JÓZEF PIŁSUDSKI
Opis:
The aim of the authors is a definite description selected issues constituting the history of the military formations existing in 1915–1917, which was the Third Brigade of the Polish Legions. On the basis of archival materials and scientific literature, the authors show the constitution of this unit, which played an important role in the struggle for Polish independence during the I World War. The construction of this study was preceded by an initial consideration, which includes in its shortened form of both aspects of the purely military and political background related with the struggle of the Polish Legions character. Next, the authors present the conditioning of the formation of 4 Infantry Regiment. The continuation of this logic is to consider the structure of the 6 Infantry Regiment. The rest of the authors complement resume closer: cavalry, artillery, command posts and the Third Brigade. At the end of the exhaust conclusions fragmented.
Źródło:
Meritum – Rocznik Koła Naukowego Doktorantów-Historyków Uniwersytetu Warmińsko-Mazurskiego w Olsztynie; 2016, VIII; 167-190
2080-4547
Pojawia się w:
Meritum – Rocznik Koła Naukowego Doktorantów-Historyków Uniwersytetu Warmińsko-Mazurskiego w Olsztynie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The issue of Strategic Assumptions of the Russian Federation of Vladimir Putin’s Era in Achieving Objectives of the International Policy
Autorzy:
Wierzbicki, Sławomir
Tarasiuk, Renata
Powiązania:
https://bibliotekanauki.pl/articles/1179446.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Russian Federation
Vladimir Putin
foreign policy
national security
political system
Opis:
An aim of the author is to describe the strategic interpretation in the field of national security adopted by President Vladimir Putin. The third term of the Russian leader is a continuation of the guidelines of vision, which have been appointed in 2000-2008. The common denominator is emphasis the large world power of Russia. However, the strategic objective is aspiration to stimulate polycentral international order. This effort is carried out both in the declarative and doctrinal sphere. Numerous expressions are an illustration of this logic that defies the peaceful coexistence by allowing also the use of force in pursuing their own interests. In practice “the Putin’s system” reviews of post-cold war European order. The reach and effectiveness of achieving this objective are visible in expanding sphere of influence, accompanied by hybrid action and development of military capability.
Źródło:
World Scientific News; 2017, 78; 157-163
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of African international organizations as a classic example of ensuring safety in the region
Autorzy:
Wierzbicki, Sławomir
Tarasiuk, Renata
Powiązania:
https://bibliotekanauki.pl/articles/1179502.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Africa
international relations
regional integration
regional organizations
state security
Opis:
Reliable presentation of the subject of Africa region in international relations is not possible without addressing the key issues associated with its past and history right after the World War II. Initiated then decolonization brought a fundamental change in the geopolitical map of African continent. The United Kingdom, France, Portugal, Belgium, Italy and Spain have lost their dependent territories, in the place which were formed 50 sovereign States. The new formed States began the process of shaping own national identity and places in international relations. It is assumed that all the States on African continent and number of islands in the oceans covering Africa (Republic of Cape Verde, São Tomé, Madagascar, Comoros, and Seychelles) are a part of the Africa region.
Źródło:
World Scientific News; 2017, 78; 328-334
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Russian Federation President and His Role in the Management of National Security System
Autorzy:
Wierzbicki, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1179684.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Constitution
President of the Russian Federation
Supreme Commander-in-Chief
Vladimir Putin
national security system
safety
Opis:
The purpose of this papers is discussion on the President of the Russian Federation and his role in the management of national security system. Third Vladimir Putin’s presidency continued the assumptions that constituted in the years 2000-2008. Its common characteristic is strong foreign and home policy according to the pattern of authoritarian type of autocracy. It is associated with close bounds with the elements of force in the sector of national security and defence (special forces, army). Execution of decisions coming from central department of presidential orders requires the efficient management of national security system. For such purpose, author points out the presidential powers related with such issues. Thereafter, the accompanying apparatus, institutional and organizational structure of administration involved in statutory tasks in terms of national security and defence will be presented.
Źródło:
World Scientific News; 2017, 72; 169-176
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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