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1

Materiały kompozytowe MOF-grafen

Szczęśniak B., Choma J., Jaroniec M.

Wiadomości Chemiczne

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2017

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[Z] 71, 9-10

671--691

EN

The effective capture of harmful gases and clean energy sources are of great importance for protection of the environment. In this regard, it is possible to take advantage of the MOF-graphene composites to develop new technologies for environmental and energy-related applications. These composites attract a great attention around the world due to their higher adsorption affinity toward CO2, volatile organic compounds (VOCs), H2 and CH4 reported in comparison to the parent MOFs. Integration of MOFs with graphene nanosheets can be a very effective strategy not only to improve their adsorption performance but also to generate new chemical and physical properties that are not present in MOFs alone. In this review we present the progress in the field of gas capture/storage using MOF-graphene composites with special attention on the correlation between composition, structure and adsorption properties.

2

Rozwój polskiego programu niewielkich rakiet sondujących

Marciniak B., Okniński A.

Prace Instytutu Lotnictwa

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2014

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Nr 1 (234) March 2014

82--89

PL

Praca zwiera przegląd niewielkich rakiet sondujących rozwijanych na Politechnice Warszawskiej przy współpracy z Instytutem Lotnictwa. Omówiony jest rys historyczny oraz główny cel programu. Wszystkie prezentowane rakiety napędzane są silnikami na stały materiał pędny. Jednostki napędowe są wytwarzane wykorzystując innowacyjną technologię nawijania kompozytowych komór spalania, co pozwala na uzyskiwanie bardzo dobrych parametrów masowych konstrukcji. Część z nich jest wielokrotnego użytku. Zaprezentowano dwa główne elementy programu rakietowego – konstrukcje z rodziny lotnych platform badawczych „Amelia” oraz rodziny „H” (profesjonalnego zastosowania). W pracy wspomniana jest także rozwojowa wersja rakiety, umożliwiająca wynoszenie eksperymentów na wysokości około 100 kilometrów. Głównym celem programu jest budowa mobilnego systemu umożliwiającego wynoszenie eksperymentów naukowych w niskie partie atmosfery przy relatywnie niskich kosztach operacyjnych i prostocie eksploatacji. Szczególny nacisk położono w pracy na ukazanie możliwego wykorzystania nabytej wiedzy oraz wybranych rozwiązań w ramach kolejnych projektów. Budowane rakiety mają umożliwić wykonanie kolejnego kroku w kierunku rozwoju niewielkich rakiet nośnych w Polsce.

EN

This paper presents an overview of small sounding rockets developed at Warsaw University of Technology with support from the Institute of Aviation. The history of Polish rocketry is discussed and the resulting Small Sounding Rocket Program ultimate goals are presented. All of the rockets are propelled using solid rocket motors. They are built using an innovative technology of composite combustion chamber manufacturing, what allows achieving very high propellant mass fractions of the developed motors. Some of them are reusable. Two main program elements are presented – the simple in-flight-experimentation platforms named “Amelia” and the „H” family of rockets dedicated to professional use. A sounding rocket capable of flying to altitudes of about 100 kilometres is also mentioned. The ultimate aim of the program is to develop a mobile system enabling launches of small experimentation modules, while maintaining relatively low costs and easy system utilization. In this paper, the possibility of using the knowledge gained and selected technical solutions is emphasized. The program is to enable future development of small satellite launchers in Poland.

3

Hydrogen and LPG sensing properties of SnO2 films obtained by direct oxidation of SILAR deposited SnS

Mitra P., Mondal S.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2008

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Vol. 56, nr 3

294-312

EN

Hydrogen (H2) and liquid petroleum gas (LPG) sensing properties of SnO2 thin films obtained by direct oxidation of chemically deposited SnS films has been studied. The SnS film was prepared by a chemical technique called SILAR (Successive Ionic Layer Adsorption and Reaction). The sensor element comprises of a layer of chemically deposited SnO2 film with an overlayer of palladium (Pd) sensitiser. The Pd sensitiser layer was also formed following a chemical technique. The double layer element so formed shows significantly high sensitivity to H2 and LPG. The temperature variation of sensitivity was studied and the maximum sensitivity of 99.7% was observed at around 200°C for 1 vol% H2 in air. The response time to target gas was about 10 seconds and the sensor element was found to'recover to its original resistance reasonably fast. The maximum sensitivity of 98% for 1.6 vol% LPG was observed at around 325°C. The sensor response and recovery was reasonably fast (less than one minute) at this temperature.

4

Wodór - paliwo jutra

Wiltowski T., Piotrowski K.

Czysta Energia

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2004

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Nr 3

24-26

5

Single-hole one-electron superexcited states and doubly-excited states of molecules as studied by coincident electron-energy-loss spectroscopy

Odagiri T., Fukuzawa H., Takahashi K., Kouchi N., Hatano Y.

Nukleonika

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2003

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Vol. 48, nr 2

95-102

EN

The single-hole one-electron superexcited states and doubly-excited states of H2, D2, N2 and O2 have been investigated by means of the coincident electron-energy-loss spectroscopy that we developed. In this method the electron-energy-loss spectra tagged with the vacuum ultraviolet fluorescences emitted by the neutral fragments produced from superexcited molecules are measured by means of electron-photon coincidence technique. The contribution from ionization in this sort of electronenergy- loss spectra is suppressed to a large extent, and thus the structures attributed to the superexcited states of molecules become highlighted. The comparison with the photoexcitation experiments by means of the oscillator strengths give us clear discrimination between allowed and forbidden superexcited-states. As to H2, D2, and N2, the doubly-excited states including those found in the present experiment have been investigated in terms of both their energies and dynamical behavior. A new possibility of the coincident electron-energy-loss spectroscopy has been established in investigating the single-hole one-electron superexcited states of O2: the time-resolved coincident electron-energy-loss spectrum has been measured to distinguish between the direct process producing excited oxygen atoms and indirect one due to cascade transition. It has turned out that the coincident electron-energy-loss spectroscopy is a key tool for investigating superexcited molecules.

6

Understanding the adiabatic approximation; the accurate data of H2 transferred to H3(+)

Hinze J., Alijah A., Wolniewicz L.

Polish Journal of Chemistry

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1998

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Vol. 72, nr 7S

1293-1303

EN

Different ab initio calculations of the rotation-vibrational states of H3(+) and its isotopomers are reviewed. In the critical discussion of the results obtained by various authors, we have attempted to analyse the origin of the slight differences remaining (i) due to the inadequacies in the potential surface or (ii) due to the adiabatic approximation used.