Wyniki wyszukiwania - Biblioteka Nauki

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The full or partial replacement of commercial marine engine oil with bio oil, on the example of linseed oil

100%

Malinowska M.

Journal of KONES

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2019

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tom Vol. 26, No. 3

129--135

EN

The bio-oils are considered to sustainable, alternative and environmentally friendly source of lubricants compared to commercial engine oils, on the base a mineral, synthetic or semi-synthetic. They are obtained from natural raw material (vegetable or animal oils), which are renewable and non-toxic to humans, living organisms and environment. The vegetable oils called green oils, natural oils, bio-oils or natural esters. They can be obtained from plant seeds, that may be consumed – edible oils (for instance: rapeseed oil) or which cannot be consumed – inedible (for example: linseed oil). The conducted research into linseed oil and its different quantity additives (25% and 50%) to commercial marine mineral oil intended for a medium-speed 4-stroke, trunk marine engine (i.e. Marinol RG 1240). The flash point and dependence of viscosity and temperature were compared and assess. It has been proven that vegetable oils have a high ignition temperature and very small viscosity change in the range of temperatures presented, i.e. high viscosity index. According to the results, it can be recommended the addition of 25% linseed oil in the base lubricant is the relevant for lubricating a medium speed 4-stroke marine engine. The vegetable additives can improve a viscosity index a lube oil, and they will be positively affected environmental protection

2

Festiwal „Warszawa w Budowie” na zajęciach języka polskiego jako obcego

100%

Malinowska M.

Kwartalnik Polonicum

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2018

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nr 30

45 - 50

EN

Although inanimate, the space takes a number of roles: it influences and is influenced, it unites people and creates divisions, demarcates the borders/limits and creates distance. It imposes its own presence in the user’s conscious as something necessary, universal and extraneous. It reflects general features of the society. The space is also perceived and interpreted by means of signs which constitute components of the city or by means of the images of the space. The semiotic way of defining the social space assumes influences and links between an individual or a group and significant elements in the space. Currently, the space of a big city gained much significance. It is filled, sometimes overly, by linguistic and/or graphic messages, inscriptions, advertisements and signboards. All these elements are related to the concept of the city anthropology and influence our perception of the cityscape. In people’s minds, the city will consist of expressions of sensing the city: both individual and collective, scientific and vernacular, which produce messages related to it representative of a given way of thinking. In mind, the city is a literary expression of emotions, engagement, alertness and sensitivity towards the form, features and specificity of urban phenomena. Sociological aspects of the urban space connect very clearly with theories of the intercultural component in the methodology of teaching by Clarie Kramsh as well as scientific approach in works by Elena Shohamy. The Warsaw Under Construction Festival pertains to the concept of the active, intercultural and contextual methods of teaching the foreign language, and is a pretext to escape the classroom and give students an opportunity to immerse themselves in the new linguistic and cultural aspect of communication. It can also motivate our students to surrender to the city drive, explore the urban space and gain the status of active user and creator of the area in which they function for a shorter or a longer period of time.

3

Compact coplanar-fed tree-shaped antenna

63%

Malinowska M. , Kitliński M.

International Journal of Electronics and Telecommunications

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2019

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tom Vol. 65, No. 2

175--180

EN

The paper presents the concept of a fully planar tree-shaped antenna with quasi-fractal geometry. The shape of the proposed radiator is based on a multi-resonant structure. Developed planar tree has symmetrical branches with different length and is fed by a coplanar waveguide (CPW) with modified edge of the ground plane. The antenna of size 29 mm x25 mm has been designed on Taconic - RF-35 substrate (er = 3.5, tgde= 0.0018, h = 0.762 mm). The paper shows simulated and measured characteristics of return loss, as well as measured radiation patterns. The proposed antenna could be a good candidate for broadband applications (for instance: wideband imaging for medical application and weather monitoring radars in satellite communication etc.)