Search results for "PGA"
showing 10 items of 244 documents
Sokrata tēls Johana Georga Hāmaņa darbā “Sokratiskās cēldomas”
2016
Šī darba mērķis būs sniegt nelielu ieskatu, kas ir arī kā interpretācija, problemātikā, kas saistīta ar Sokrata tēlu Hāmaņa darbā “Sokratische Denkwürdigkeiten” jeb “Sokratiskās cēldomas”. Lai sasniegtu izvirzīto mērķi, vispirms tiks indentificētas problēmas, kas rodas darbā ar Hāmaņa tekstiem. Sekojoši, tiks ieskicēti daži metodoloģiski apsvērumi, kuri varētu būt noderīgi strādājot ar šādu materiālu. Balstoties uz iegūtajiem secinājumiem, mēģināšu identificēt tēmu lokus, kas varētu būt saistāmi ar Sokrata tēlu. Visbeidzot, pievērsīšos Hāmaņa teksta analīzei, lai iezīmētos tēmu lokus ievietotu kontekstā, kur tie iegūst nozīmi.
A Hardware and Secure Pseudorandom Generator for Constrained Devices
2018
Hardware security for an Internet of Things or cyber physical system drives the need for ubiquitous cryptography to different sensing infrastructures in these fields. In particular, generating strong cryptographic keys on such resource-constrained device depends on a lightweight and cryptographically secure random number generator. In this research work, we have introduced a new hardware chaos-based pseudorandom number generator, which is mainly based on the deletion of an Hamilton cycle within the $N$ -cube (or on the vectorial negation), plus one single permutation. We have rigorously proven the chaotic behavior and cryptographically secure property of the whole proposal: the mid-term eff…
Efficient MLP Digital Implementation on FPGA
2005
The efficiency and the accuracy of a digital feed-forward neural networks must be optimized to obtain both high classification rate and minimum area on chip. In this paper an efficient MLP digital implementation. The key features of the hardware implementation are the virtual neuron based architecture and the use of the sinusoidal activation function for the hidden layer. The effectiveness of the proposed solutions has been evaluated developing different FPGA based neural prototypes for the High Energy Physics domain and the automatic Road Sign Recognition domain. The use of the sinusoidal activation function decreases hardware resource employment of about 32% when compared with the standar…
A new hybrid procedure for the definition of seismic vulnerability in Mediterranean cross-border urban areas
2016
Assessment of seismic vulnerability of urban areas provides fundamental information for activities of planning and management of emergencies. The main difficulty encountered when extending vulnerability evaluations to urban contexts is the definition of a framework of assessment appropriate for the specific characteristics of the site and providing reliable results with a reasonable duration of surveys and post-processing of data. The paper proposes a new procedure merging different typologies of information recognized on the territories investigated and for this reason called “hybrid.” Knowledge of historical events influencing urban evolution and analysis of recurrent building technologie…
Ģeogrāfiskās telpas sociālā konstruēšana: Austrumeiropas (vai Orienta) konceptualizācijas piemērs
2017
Mentālās kartes ir neatdalamā daļa no mūsu domāšanas. Mentālās kartes ietekmē cilvēku subjektīvās vēsturiskās, ģeogrāfiskās un politiskās telpas veidošanu. Šajā darbā es aprakstīšu, kā ar mentālo karšu palīdzību laikmetā no 18.gs. Rietumeiropā aizsākās Austrumeiropas priekšstata veidošanas vēsture, kura attīstība tiks izskatīta līdz mūsdienām. Šī jautājuma noskaidrošanai, par pamatu pielietoju L. Vulfa grāmatu “Izgudrojot Austrumeiropu”, A. Apelbauma “Dzelzs priekškars”, H. Lefevra “Telpas konstruēšana”.
Field Oriented Control of IPMSM Fed by Multilevel Cascaded H-Bridges Inverter with NI-SOM sbRIO-9651 FPGA controller
2022
Electrical drives fed by Multilevel Inverters (MIs) are of considerable interest for traction and e-mobility applications. In detail, Cascaded H-Bridge Multilevel Inverter (CHBMI) is a promising solution for electrical drive optimization purposes in terms of efficiency, safety, integration and flexible use of energy sources. The aim of this paper is the experimental implementation of the field-oriented control strategy of Interior Permanent Magnet Synchronous Machine (IPMSM) fed by CHBMI by use of NI-SOM sbrRIO-9651 FPGA controller. This FPGA controller can be programmable in the LabVIEW programming environment with the consequent benefits of graphical programming. The paper address the acq…
The TileCal Optical Multiplexer Board 9U
2011
Abstract TileCal is the hadronic calorimeter of the ATLAS experiment at LHC/CERN. The system contains roughly 10,000 channels of read-out electronics, whose signals are gathered and digitized in the front-end electronics and then transmitted to the counting room through two redundant optical links. Then, the data is received in the back-end system by the Optical Multiplexer Board (OMB) 9U which performs a CRC check to the redundant data to avoid Single Event Upsets errors. A real-time decision is taken on the event-to-event basis to transmit single data to the Read-Out Drivers (RODs) for processing. Due to the low dose level expected during the first years of operations in ATLAS it was deci…
Cascaded H-Bridges Multielvel Inverters: grid connected advanced applications
Power electronics is going to increase in the modern electrical systems. It is well known that the use of power electronics allows the management and the control of the energy flow, obtaining voltage and current waveforms suitable for electrical loads. In this scenario, multilevel power converters are finding increased attention in industry and academia as one of the promising choices of electronic conversion thanks to their features and many different application fields with high power and medium voltage. Moreover, they are fundamental in interfacing electric grid to high power renewable energy systems (i.e. PV, Wind farm, Biomass, Fuel Cell etc.). Nowadays, the research is focused on the …
Poly(glycolide) multi-arm star polymers: Improved solubility via limited arm length.
2010
Due to the low solubility of poly(glycolic acid) (PGA), its use is generally limited to the synthesis of random copolyesters with other hydroxy acids, such as lactic acid, or to applications that permit direct processing from the polymer melt. Insolubility is generally observed for PGA when the degree of polymerization exceeds 20. Here we present a strategy that allows the preparation of PGA-based multi-arm structures which significantly exceed the molecular weight of processable oligomeric linear PGA (<1000 g/mol). This was achieved by the use of a multifunctional hyperbranched polyglycerol (PG) macroinitiator and the tin(II)-2-ethylhexanoate catalyzed ring-opening polymerization of gly…
Rīgas apgabaltiesā, Civilnodaļā apsardzības kārtībā iztiesājamās lietas
1933
Rīgas apgabaltiesā, III Civilnodaļā apsardzības kārtībā iztiesājamās lietas no Nr. 1.-181. ieskaitot, 1933. g. no 11. janvāra līdz 2. februārim un no 16.-17. februārim, I Civilnodaļā apsardzības kārtībā iztiesājamās lietas no Nr. 182.-184. ieskaitot, I Civilnodaļā prasības kārtībā iztiesājamās lietas no Nr. 185.-198.