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Wyniki wyszukiwania dla: VENTURI NOZZLE
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The impact of nozzle configuration on the heat transfer coefficient
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Some Aspects of Designing Nozzle Segments of Axial Microturbines,
PublikacjaIn the paper a multi-stage micro-turbine with partial admission of all the stages is described in detail and the results of the numerical calculations and experimental investigations are presented, followed by an appropriate discussion and conclusions.
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Numerical Study of the Impinging Jets Formed by an Injector with Different Nozzle Diameters
PublikacjaThe collision of two or more liquid jets may provide considerable atomisation and efficient mixing of injected substances at the same time. This phenomenon is used, among others, in rocket engines, where the fuel and oxidiser are introduced separately and almost immediately mixed through self-impingement. Depending on the injection and operating conditions, diverse configurations of impinging jets are used, such as doublets,...
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An asymmetrical λ-foot of condensing steam flow in the IMP PAN nozzle
PublikacjaIn the present paper we have focused on the precise prediction of the spontaneous condensation phenomena in wet steam flow. Novelty of our approach lies on modelling both the moment of initiation of a phase transition, as well as the moment of its reverse progress - called here re-vaporization of the condensate phase. The practical issue is to elaborate of a model of spontaneous condensation/vaporization of water steam flow...
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Design and distribution of air nozzles in the biomass boiler assembly
PublikacjaDue to energy crisis as well as increasing pollution of the environment, renewable energy sources usage increases all over the world. These facts encouraged authors to start research over developing a uniform biomass boiler calculation model. This paper presents a design of biomass boiler assembly created for ORC (Organic Rankine Cycle) unit since these systems could achieve strong position in energy industry....
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CFD analysis of jet flows ejected from different nozzles
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Venture capital w finansowaniu rozwoju przedsiębiorstwa
PublikacjaW różnych fazach rozwoju, przedsiębiorstwa korzystają z wielu rodzajów źródeł finansowania. Wybór konkretnej formy finansowania, kapitału własnego czy obcego, źródła długo lub krótkoterminowego, zależy od wielu istotnych dla przedsiębiorstwa czynników. Korzystanie z venture capital związane jest często z brakiem możliwości pozyskania kapitału z innego źródła. Opracowanie omawia proces inwestycyjny w funduszach venture capital,...
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EXPERIMENTAL RESEARCH ON INFLUENCE OF THE FUEL NOZZLE GEOMETRY ON THE FUEL CONSUMPTION OF THE MARINE 4-STROKE DIESEL ENGINE
PublikacjaThe article presents experimental research that has been carried out on a marine, 4-stroke, 3-cylinder, turbocharged engine. During testing, the engine operated at a constant rotational speed of 750 rpm and a load from 0 kW to 280 kW. The engine was fuelled by diesel oil of known specification and loaded by electric generator with water resistance. The fuel consumption was measured during the engine operation with fuel nozzles...
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The influence of the fuel spray nozzle geometry on the exhaust gas composition from the marine 4-stroke diesel engine
PublikacjaThe paper presents experimental research on a 4-stroke, 3-cylinder, turbocharged AL25/30 Diesel engine. Research consisted in investigating the effect of the geometry of the fuel injectors on the exhaust gas composition from the engine. During measurements, the engine was operated with a regulator characteristic of a load range from 40 kW to 280 kW, made by electric water resistance. The engine was mechanically coupled to the electric...
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Novel strategies to enhance hydrodynamic cavitation in a circular venturi using RANS numerical simulations
PublikacjaHydrodynamic cavitation is a popular advanced oxidation technique and it has received wide range of applications from waste water treatment to the nanoparticles synthesis in recent years. The enhancement of the intensity of the hydrodynamic cavitation is always been an emerging field of research. Within this framework, we have proposed and investigated three distinct strategies to enhance the intensity of cavitation in a circular...
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The teaching of architecture in the nineteenth century
PublikacjaTematem artykułu jest system kształcenia inżynierów architektów, jaki miał miejsce pod koniec XIX wieku w lwowskiej Szkole Politechnicznej jednej z pierwszych i przez długi czas jedynej na tych ziemiach uczelni technicznej. Omówiona jest zawartość merytoryczna i organizacja pierwszego programu nauczania jaki został przyjęty po uzyskaniu przez uczelnię praw szkoły wyższej (1877), aż do jego reorganizacji pod koniec stulecia, wymuszonej...
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Sintering Parameter Investigation for Bimetallic Stainless Steel 316L/Inconel 718 Composite Printed by Dual-Nozzle Fused Deposition Modeling
PublikacjaFused deposition modeling (FDM) nowadays offers promising future applications for fabricating not only thermoplastic-based polymers but also composite PLA/Metal alloy materials, this capability bridges the need for metallic components in complex manufacturing processes. The research is to explore the manufacturability of multi-metal parts by printing green bodies of PLA/multi-metal objects, carrying these objects to the debinding...
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Prussian Star Forts in the 18th Century
PublikacjaTekst omawia grupę tzw. ''fortów gwiaździstych'', charakterystycznych budowli obronnych, budowanych w pruskich twierdzach w XVIII w.
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Family business experience and the probability of starting a venture: gender differences in Poland
PublikacjaThe aim of this study is to analyse whether the experience of working in a family member’s business is related differently to the assessed probabilities of men and women starting their own new venture in the future. The research is conducted on a sample of 334 Polish undergraduate students. Poland is an efficiency-driven European economy with a substantial gender gap in entrepreneurship. The results obtained indicate that the relationship...
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Is the growing wealth the driving force for venture capital fundraising in Europe? An empirical analysis
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Venture capital w finansowaniu inwestycji podwyższonego ryzyka w warunkach kryzysu
PublikacjaW publikacji przedstawiono venture capitał jako źródło finansowania inwestycji podwyższonego ryzyka. Wykorzystanie venture capital odniesiono do kryzysu gospodarczego. Podjęto się również oceny funkcjonowania funduszy venture capital w warunkach gospodarki Polski.
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Entrepreneurship as the Challenge for Polish Economy in the 21st Century
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POLAND’S ENERGY DEPENDENCE AT THE TURN OF THE 21ST CENTURY
PublikacjaThe following article is an attempt to assess Poland's energy independence in the years 1993-2020. The main aim of the paper is to present Poland's dependence on raw materials from foreign partners - in the field of imports of electricity, natural gas, crude oil, non-renewable energy resources, i.e., hard coal and lignite, and the country's dynamics in the amount of imports. In addition, the aim of the work is to answer research...
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Redefining quality and organizational maturity in 21st century
PublikacjaThe article presents new tendencies in quality management approach in the opinion of the one of the best known European quality expert Professor John Oakland
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Cast iron in the 19th-century building equipment
PublikacjaCast iron is a material, characteristics of which enable to receive extremely artistic elements. It maintains good strength properties at the same time. That combination of these seemingly contrary traits makes it a commodity that was widely used in the 19th century industry and architecture. These usages were not only as decorative elements, technical and structural ones. The production of new household utilities started, which...
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The concept of entrepreneurial university as an answer to the challenges of the 21st century
PublikacjaW rozdziale zaprezentowano główne zmiany w środowisku akademickim wraz z oczekiwaniami i wymaganiami interesariuszy uczelni. Zaproponowano również koncepcję uczelni przedsiębiorczej, która pozwala uczelniom stać się konkurencyjnymi na rynku usług edukacyjnych.
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EXTRAORDINARY RAINFALLS IN GDANSK (NORTHERN POLAND) IN THE 21ST CENTURY
PublikacjaIn the 21st century Gdansk had been affected by two rainfall events with a total precipitation amount of over 120 mm each. Rainfall parameters exceeded the regional values of the rain occurring once every 100 years. At the meteorological station of Gdansk University of Technology, July 9th 2001 was recorded 123.5 mm and July 14th 2016, 150.8 mm rainfall (within 24 hours observation period). Despite the same seasons of summer months...
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Missing Puzzle Pieces in Dementia Research: HCN Channels and Theta Oscillations
PublikacjaIncreasing evidence indicates a role of hyperpolarization activated cation (HCN) channels in controlling the resting membrane potential, pacemaker activity, memory formation, sleep, and arousal. Their disfunction may be associated with the development of epilepsy and age-related memory decline. Neuronal hyperexcitability involved in epileptogenesis and EEG desynchronization occur in the course of dementia in human Alzheimer’s Disease...
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NOBLE METAL MODIFIED TiO2 FOR PHOTOCATALYTIC AIR PURIFICATION
PublikacjaTiO2 was surface modified with silver, gold, palladium and platinum ion clusters to improve its photocatalytic activity. The effect of metal content, the kind of dopant used during preparation procedure on the photoactivity were investigated. in toluene removal which was used as a model volatile organic compound. Toluene, at the concentration of about 100 ppm, was irradiated over noble metal modified TiO2 using light-emitting diodes...
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Economic Situation in Balkan Countries in the First Decade of 21st Century
PublikacjaThe recent economic crisis affected most of the countries in the world to a greater or lesser extent, including small economies sector. Small economies are a distinctive group of countries distinguished by particular qualities. They are dependent on trade exchange or international investment stream, and both their aggregate demand and supply, and price level depend on the development of the big economies dynamics. This is the reason...
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Pavilion Hospitals Of West Prussia In The 19th Century – Evolution Of The Idea
PublikacjaIn the 19th century a number of modern curative and healthcare hospitals with complex functional and spatial layout were erected in the territory of the West Prussia. The largest of them were specialist centers treating physical and mental illnesses and disabilities: institutions for mentally ill patients (including addicts), epileptics and disabled people. Apart from the medical treatment section, there were administrative, social...
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Nightscape in the E-city. Lighting Public Space in the 21st Century
PublikacjaRozdział porusza kwestię oświetlenia sztucznego w przestrzeniach publicznych współczesnego miasta. Temat ten zaprezentowany został na tle obecnych tendencji kształtowania wizerunku przestrzeni publicznych oraz poparty krótkim rysem historycznym. Aspekt podzielony jest na dwie kategorie - pierwszą, w której oświetlenie bazuje na zmiennych sceneriach przestrzeni z wykorzystaniem głównie ekranów medialnych, oraz drugą, w której mamy...
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Lighting Design for the 21st Century Applied research in lighting practice
PublikacjaFor those who are unfamiliar with research, it’s important to know there are two categories. Fundamental (or basic) research and applied research. Basic research often discusses scientific ideas/theories, whereas, applied research explores testing these ideas in practice to develop technology or techniques. It’s applied research which most interests lighting practitioners. Great lighting design that creates a pleasant and beneficial...
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Educating planners in Europe: A review of 21st century study programmes
PublikacjaEducation for urban, regional and spatial planning has become a regular subject throughout most European nations; this can be attributed in part to European policies promoting planning and spatially balanced development, but also to the recognition that planning can support sustainability. Nevertheless, there is lingering and justifiable concern about the status, profile and recognition of planning as a profession in its own right...
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Ad hoc prayer spaces – a challenge of the architecture of the 21th century
PublikacjaThis article considers the problem of arranging places of prayer in the vicinity of universities and dormitories. A survey was conducted among students living in the dormitories of the Gdańsk University of Technology in order to determine if there was a real need to arrange such spaces. Subsequently, examples of temporary chapels designed in the last 20 years in Western European countries were presented. Analysis of the selected...
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Structural optimization of microjet array cooling system
PublikacjaThe single phase heat transfer from an upward facing, horizontal copper surface to arrays of impinging water jets was experimentally investigated. Experimental configuration allows for a free-surface unconfined jets flow. Square nozzles 50 × 100 μm arranged in four different geometries were used. Additionally, for the set of two jets array geometry was varied by adjusting the nozzle to nozzle distance. The area averaged heat transfer...
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Solar Photocatalytic Degradation of Sulfamethoxazole by TiO2 Modified with Noble Metals
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NOx Photooxidation over Different Noble Metals Modified TiO2
PublikacjaWe compared the activity enhancement effect of noble metal deposited on TiO2 in photocatalytic nitrogen oxides oxidation. Titanium dioxide was decorated with Ag, Au, Pt or Pd in the sol-gel process. Synthesized catalysts were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller measurement (BET), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX)....
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Law of Nature as Justification for Reforms. Polish Political Thought in the Eighteenth Century
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High quality academic teacher of 21st century - Polish students' perspective
PublikacjaThe aim of the study is to determine the characteristics of the academic teacher quality level from the perspective of Polish universities students’ in 21st century.
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THE CREATIVE AND SYMBOLIC FUNCTIONS OF DAYLIGHT IN THE ART MUSEUM BUILDINGS OF THE 21st CENTURY
PublikacjaThe paper presents the results of the study on the current extent of daylight use in contemporary buildings of art museums, focusing especially on the possibilities of aesthetic function. A case study and critical analysis were used as the research method. Selected, representative examples of museums of the 21st century are discussed with regard to the creative and functional use of daylight and the application of advanced technology....
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Lightweight glass and metal roof structures in the 19th century. Architecture and construction.
PublikacjaThe 19th century brought new construction possibilities. The usage of metal elements in mesh structures, filled in with glass, resulted in creating entirely new types of objects. They have distinguished themselves in architecture and technical solutions. The envelope structures giving spatial interiors were arising very quickly. They have been enabling large light penetration, triggering them extremely bright. Thus these building...
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Specialist Pavilion Hospitals Of West Prussia In The 19th Century – Evolution Of The Idea
PublikacjaThe size and shape of the largest pavilion hospitals established in West Prussia in the 19th century changed along with the advancing technical and medical knowledge, the progress of ideas regarding modern society, architectural patterns, and the needs for which the hospitals were built. Apart from the medical treatment section, there were administrative, social and technical facilities, all constituting parts of the complex. The...
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New Challenges in Management and Economics in 21st century. Selected studies and examples
PublikacjaIn Chapter 1 authors describe the method used to assess the level of readiness of an organization to introduce the Lean Six Sigma concept supporting the Quality 4.0 assumptions, which is gaining more and more interest not only in large organizations, but also in the SME sector. Its use will be illustrated by the example of a small service company. Chapter 2 presents the characteristics of blockchain technology applications in the...
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Do We Need a Lighting Detox for Sustainable Cities in the 21st Century?
PublikacjaThis article looks at relearning our connection to light and dark in context of sustainability, climate change and urban lighting.
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Noble metal–TiO2 supported catalysts for the catalytic ozonation of parabens mixtures
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Noble metal-modified titania with visible-light activity for the decomposition of microorganisms
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NANOCRYSTALLINE CATHODES FOR SOLID OXIDE FUEL CELLS MADE OF NOBLE METALS
PublikacjaCathodes for solid oxide fuel cells prepared by the infiltration method at 600 °C are presented. The infiltration method allows to produce stable, nanostructured electrodes. Cathodes were prepared using gold, platinum, La2NiO4+δ (L2N) and La0.6Sr0.4Co0.2Fe0.8O3 δ (LSCF). Symmetrical cathode/electrolyte/cathode samples were prepared and examined with SEM microscopy and electrochemical impedance spectroscopy. Despite successful deposition...
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Mechanical and Physicochemical Properties of Newly Formed ZnO-PMMA Nanocomposites for Denture Bases
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Preparation and Characterisation of Poly(methyl metacrylate)-Titanium Dioxide Nanocomposites for Denture Bases
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The Sea And The Beach As Composition Elements Of The Coastal Gardens In West Prussia In The 19th Century
PublikacjaThe melancholic and changeable character of the Baltic Sea has often been used in the painting of the romantic period. The sea and its beaches were also an important composition element as well as a supplement of Baltic coastal gardens which were founded in West Prussia in the 19th century. Gardens set up on the coast used various moods of nature, as well as extensive and beautiful sea landscapes, often leading to nostalgia. The...
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The influence of the development of private air communication on the architecture and urban planning of the 21st century
PublikacjaIn the first part, the article describes the stages of the development of gyroplanes and the influence of wartime policy on the interest in light aircraft. Also presented are links and the possibilities of using gyroplanes in various sectors of the economy. The authors, based on source texts, present the current position of the aviation industry in the Polish economy and attempt to diagnose its development capabilities. As a result,...
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Design of a most efficient fuel cell using noble metals and composite materials.
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Detoxification of parabens using UV-A enhanced by noble metals—TiO2 supported catalysts
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Lean Startup as a New Way of Managing Technology Ventures Illustrated by the Example of Wlcome App
PublikacjaThe dot-com bubble in the 1990s made the technology industry aware that even excellent ideas backed by amazing teams are not sufficient to ensure a startup’s success. The biggest risk of startups is that they have to operate within many uncertainties, their market and customers are unknown, and their business model is not yet validated. Therefore, successful execution of such a venture requires a rigorous process that would validate...