Autor: Šafář, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Organic Compounds Released by Thermal Decomposition of Wood Composite
Związki organiczne uwalniane w czasie termicznego rozkładu kompozytów drzewnych
Autorzy:: Ruzickova, J.
Safar, M.
Raclavska, H.
Skrobankova, H.
Raclavsky, K.
Powiązania:: https://bibliotekanauki.pl/articles/319129.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Tematy:: geochemia organiczna
biomasa
piroliza GC/MS
analiza termiczna (TG/DSC)
sklejka
płyty drewniane
organic geochemistry
biomass
pyrolysis-GC/MS
thermal analysis TG/DSC
plywood
chipboard
Opis:: Combustion of biomass materials based on wood combined with synthetic polymers was studied. Material types included plywood and wood chipboard. Wood chips prepared from hardwood – beech and softwood – spruce were used for comparison. Combustion process was characterized by thermal analysis – thermogravimetry and differential scanning calorimetry. Pyrolysis gas chromatography with mass spectrometric detection was used for determination of organic compounds and their fragments formed during thermal decomposition. Attention was paid to organic compounds contained in wood-polymer composites.
Zbadano spalanie materiałów biomasowych na bazie drewna w połączeniu z syntetycznymi polimerami. Materiały zawierały sklejkę i drewniane płyty wiórowe. Do porównania użyto zrębków z drewna liściastego - drewna bukowego i miękkiego - świerka. Proces spalania scharakteryzowano prowadząc analizą termiczną - termograwimetrią i różnicową kalorymetrię skaningową. Do oznaczenia zawartości związków organicznych i ich pochodnych powstałych w trakcie procesu użyto pirolitycznej chromatografii gazowej z detekcją spektrometryczną. Zwrócono uwagę na związki organiczne zawarte w kompozytach drewno-polimer.
Źródło:: Inżynieria Mineralna; 2018, R. 19, nr 1, 1; 87-92
1640-4920
Pojawia się w:: Inżynieria Mineralna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Accuracy performance of e-Loran receivers under Cross-Rate Interference conditions
Autorzy:: Šafář, J.
Williams, P.
Vejražka, F.
Powiązania:: https://bibliotekanauki.pl/articles/320661.pdf
Data publikacji:: 2012
Wydawca:: Polskie Forum Nawigacyjne
Tematy:: e-Loran
Cross-Rate Interference
signal processing
Opis:: According to a recent Business Case produced by the General Lighthouse Authorities of the United Kingdom and Ireland (GLAs), e-Loran is the only system that, when combined with GNSS, can achieve cost effective resilient Positioning, Navigation and Timing (PNT) by 2018 for maritime e-Navigation. The GLAs currently operate a trial e-Loran service from Harwich, UK and are working towards establishing e-Loran Initial Operational Capability (IOC) in the seven busiest UK ports and port approaches by mid-2013. A future extension of e-Loran coverage to the entire GLA service area will require the installation of additional transmitting stations. When planning the installation of e-Loran transmitters service providers will need a good understanding of the effects of the new signals on the system’s performance. Since all e-Loran stations share the same frequency band and the e-Loran signals propagate over vast distances, special attention needs to be paid to the issue of intra-system interference. This is also referred to as Cross-Rate Interference (CRI) and is inherent to the way e-Loran operates. In this paper we examine the impact of CRI on the position accuracy performance of e-Loran receivers. First, a signal processing model for a typical e-Loran receiver is developed. This could provide the e-Loran community with a unified framework for receiver performance evaluation. Numerical and, where possible, analytical results obtained from the model are then presented, describing the achievable accuracy performance under different interference conditions. The theoretical results are also compared to those obtained from measurements made on a commercially available receiver driven by a signal simulator. Our analysis shows that modern e-Loran signal processing algorithms can achieve a substantial reduction of the negative effects of CRI. However, there is still an appreciable residual effect, which should be taken into account when designing future e-Loran networks and determining their coverage and performance.
Źródło:: Annual of Navigation; 2012, No. 19, part 1; 133-148
1640-8632
Pojawia się w:: Annual of Navigation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Accuracy Performance of eLORAN for Maritime Applicaations
Autorzy:: Safar, J.
Lebekwe, C. K.
Williams, P.
Powiązania:: https://bibliotekanauki.pl/articles/320825.pdf
Data publikacji:: 2010
Wydawca:: Polskie Forum Nawigacyjne
Tematy:: enhanced Loran
accuracy
maritime applications
Opis:: E-Loran, or enhanced Loran, is the latest in the longstanding and proven series of low frequency, LOng-RAnge Navigation systems. eLoran evolved from Loran-C in response to the 2001 Volpe Report on GPS vulnerability. It improves upon previous Loran systems with updated equipment, signals, and operating procedures. The improvements allow eLoran to provide better performance and additional services when compared to Loran-C, and enable eLoran to serve as a backup to satellite navigation in many important applications. Different applications impose specific requirements on the navigation system's accuracy, availability, integrity and continuity performance. In the maritime sector, accuracy requirements are the most stringent. In order to comply with the requirements of the International Maritime Organisation (IMO) for harbour entrance approach, eLoran has to provide an accuracy of better than 10 m (95%). Achieving this target is possible if the eLoran navigation receiver is equipped with an up-to-date database of signal propagation corrections and if real-time differential Loran corrections are applied. When these conditions are met, the achievable accuracy is largely determined by the transmitters' geometry, signal strengths and atmospheric noise levels, but also by the mutual interference among eLoran stations. This is also referred to as Cross-Rate Interference (CRI) and is inherent to the way all Loran systems operate. In this paper we present results of the eLoran research that is being conducted at the Czech Technical University in Prague (CTU) and the University of Bath (UK) in cooperation with the General Lighthouse Authorities of the United Kingdom and Ireland. In our work we have focused on questions that arise when considering introducing new eLoran stations into an existing network. This particular paper investigates the achievable accuracy performance of eLoran for maritime applications. The sources of measurement error in eLoran are reviewed, and an eLoran accuracy performance model is presented. Special attention is paid to the problem of CRI and possible ways of its mitigation. This paper is an abridged version of a more detailed unpublished paper which can be found at the following address: http://safar.me.uk/pub/js_cl_pw_navsup_2010.pdf.
Źródło:: Annual of Navigation; 2010, 16; 109-121
1640-8632
Pojawia się w:: Annual of Navigation
Dostawca treści:: Biblioteka Nauki

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