Search results for "LIFETIME"
showing 10 items of 212 documents
An energy analysis of IEEE 802.15.6 scheduled access modes
2010
Body Area Networks (BANs) are an emerging area of wireless personal communications. The IEEE 802.15.6 working group aims to develop a communications standard optimised for low power devices operating on, in or around the human body. IEEE 802.15.6 specifically targets low power medical application areas. The IEEE 802.15.6 draft defines two main channel access modes; contention based and contention free. This paper examines the energy lifetime performance of contention free access and in particular of periodic scheduled allocations. This paper presents an overview of the IEEE 802.15.6 and an analytical model for estimating the device lifetime. The analysis determines the maximum device lifeti…
L'accesso al credito immobiliare
2018
The essay deals with the issue of the various forms of financing real estate purchases with particular regard to the new types of contracts designed specifically to facilitate access to credit, such as rent to buy, the real estate lifetime loan, the real estate credit to businesses and the real estate credit to consumers
Routing Algorithm for Maximizing Lifetime of Wireless Sensor Network for Broadcast Transmission
2018
In the article we discuss solutions of the maximum lifetime broadcasting problem in wireless sensor networks. Due to limited energy resources of the network nodes to find an optimal transmission route of the broadcasted data we minimize the maximum energy consumed by the nodes. We give an analytical solution of the problem in one dimensional regular sensor network for the point-to-point and point-to-multipoint data transmission scheme. We show that in such a network, when the cost of data transmission is a polynomial function of distance between transmitter and receiver, there exist solutions with an equal energy, i.e., all nodes of the network consume the same amount of energy. We assume t…
Study of Bacillus subtilis spore's : characterication of stuctures implied in its resistance
2013
The bacterial spore is a multilayer microbial form which is extremely resistant to environmental perturbations. This resistance is especially due to its unique structure which is particularly compact and weakly permeable. This work aims to identify and characterize the spore structures involved in these properties. Overall investigation methods, such as NMR and fluorescence anisotropy, have shown that the cortex of Bacillus subtilis spores is modified by temperature for level similar to that of the activation of germination. This will result in changes to the access to the inner membrane. A tool at the spore’s scale, the fluorescence lifetime imaging microscopy (FLIM) in conjunction with th…
Recent Borexino results and perspectives of the SOX measurement
2017
International audience; Borexino is a liquid scintillator detector sited underground in the Laboratori Nazionali del Gran Sasso (Italy). Its physics program, until the end of this year, is focussed on the study of solar neutrinos, in particular from the Beryllium, pp, pep and CNO fusion reactions. Knowing the reaction chains in the sun provides insights towards physics disciplines such as astrophysics (star physics, star formation, etc.), astroparticle and particle physics. Phase II started in 2011 and its aim is to improve the phase I results, in particular the measurements of the neutrino fluxes from the pep and CNO processes. By the end of this year, data taking from the sun will be over…
LU Filoloģijas un filozofijas fakultātes klasiskās filoloģijas studenta Jāņa Gefkina (1911-1938) izvadīšana Rīgas Meža kapos
1938
The coffin of Jānis Gefkins (1911-1938), a graduate of Riga State Gymnasium No.1, student of classical philology at the Faculty of Philology and Philosophy of the University of Latvia and member of the Latvian student fraternity Fraternitas Lettica. PHOTO 2 - being taken from the chapel to his burial place in Riga Forest Cemetery in May 1938. PHOTO 2 - The Honour Guard of the Latvian student fraternity Fraternitas Lettica mournfully attends the funeral of their deceased member. PHOTO 3 - The honour guard of the Latvian student fraternity Fraternitas Lettica mournfully accompanies its deceased member to his burial place in the Riga Forest Cemetery.
LU Filoloģijas un filozofijas fakultātes klasiskās filoloģijas students Jānis Gefkins (1911-1938)
1938
Jānis Gefkins (1911-1938), a graduate of Riga State Gymnasium No.1, student of classical philology at the Faculty of Philology and Philosophy of the University of Latvia and member of the Latvian student fraternity Fraternitas Lettica, passed away at the age of 27.
Latviešu studentu korporācijas Fraternitas Lettica saime ierodas Rīgas Meža kapos uz profesora Aleksandra Būmaņa kapakmeņa atklāšanu
1991
The Latvian Student fraternity Fraternitas Lettica, accompanied by its guard of honour, arrives at the Riga Forest Cemetery to participate in the unveiling of the tombstone of its member, Alfrēds Būmanis, Latvian lawyer and professor of law at the Faculty of Economics and Law of the University of Latvia. The unveiling of the tombstone coincides with the collapse of the USSR and the restoration of Latvia's independence.
A measurement of the K-S lifetime
2002
A measurement of the K_S lifetime is presented using data recorded by the NA48 experiment at the CERN-SPS during 1998 and 1999. The K_S lifetime is derived from the ratio of decay time distributions in simultaneous, collinear K_S and K_L beams, giving a result which is approximately independent of the detector acceptance and with reduced systematic errors. The result obtained is tau_S=(0.89598 +- 0.00048 +- 0.00051)x10^(-10) s, where the first error is statistical and the second systematic.
Lifetime predictions of non-ionic and ionic biopolymers: kinetic studies by non-isothermal thermogravimetric analysis
2021
AbstractIn this paper, films based on sustainable polymers with variable charge have been investigated by non-isothermal thermogravimetry in order to predict their lifetime, which is a key parameter for their potential use in numerous technological and biomedical applications. Specifically, chitosan has been selected as positively charged biopolymer, while alginate has been chosen as negatively charged biopolymer. Among non-ionic polymers, methylcellulose has been investigated. Thermogravimetric measurements at variable heating rates (5, 10, 15 and 20 °C min−1) have been performed for all the polymers to study their degradation kinetics by using isoconversional procedures combined with ‘Mas…