Novi doktorski studij

Uredovno vrijeme

Uredovno vrijeme za studente je radnim danom od 12 do 14 sati. U navedenom vremenu vrata hodnika Odjela za fiziku (prizemlje i prvi kat) bit će otključana, dok ulaz na suteren studentima nije dozvoljen. 

Seminar

Biomedical Application Technologies and Sensors at BATS-lab of UMG

 

Izv. prof. dr. sc. Antonino Fiorillo

Università degli Studi "Magna Graecia" di CATANZARO, Italija

 

Mjesto i vrijeme:

Ponedjeljak, 12. lipnja 2017. u 11:00 sati
Predavaona O-152
Sveučilišni Kampus na Trsatu
Radmile Matejčić 2
51000 Rijeka


Sažetak:

The research at BATS lab is focused mainly on electronic sensors fabrication. The most investigated and advanced device consists of a piezo-polymer film shaped in semicircular geometry to manufacture ultrasonic sensors in air. These devices are suitable to mimic the echolocation system of bats and rats. Interesting results on the cerebral activity of rat’s brain stimulation, after implantation, demonstrated that the inferior colliculus can be directly stimulated by ultrasound acquired with the sensor, located outside and bypassing the  biological inner ear.

The same polymer, PVDF, is used as pyroelectric sensor to measure the temperature of biological fluids in microchannels for Lab-on-Chip application. In a different arrangement it is used to monitor apnoea events in prenatal babies.

Capillaroscopy is also investigated and a low cost prototype has been fabricated by a students Start-Up, as well as a sensorized can for blinds.

Finally, zeolite nanoporous structures are investigated to match, in terms of bio-energy conversion, iono-to-electronic devices.
 

And Now for Something completely different: exploring interstellar magnetic fields in the Milky Way

 

Dr. sc. Andrea Bracco

Irfu-CEA/Saclay, Francuska


Mjesto i vrijeme:

Srijeda, 30. studeni 2016. u 13:00 sati
Predavaona O-153
Sveučilišni Kampus na Trsatu
Radmile Matejčić 2
51000 Rijeka


Sažetak:

What would you say if you were asked: "What is the Milky Way made of?" Most likely, and reasonably, "stars" would be the answer. However, not only stars are just one facet of the Galactic content but modern astrophysics also struggles in explaining the details of their formation process. In order to gain insights into this problem it is key to study the physics of the outer space that fills the Galaxy between stars, which is called interstellar medium.


The interstellar medium is a plasma made of cosmic rays, multiphase gas, and dust particles, all tightly coupled with magnetic fields. It is through their interactions that a complex cycle, involving gravity, several phase transitions, and magneto-hydrodynamic turbulence, leads diffuse/warm matter to condense into denser/colder regions, where stars eventually form. However, the detailed processes of this matter cycle are still unclear. For decades, one of the most difficult challenges of astrophysical observations has been the characterization of magnetic fields along this evolutionary sequence.

Today, thanks to the technological breakthrough of new experiments, such as the ESA-Planck satellite, we are now entering a new era to probe the magnetic properties of the interstellar medium.
 
After reviewing the state-of-the-art investigation of magnetic fields in the Milky Way, in this talk I will give an introductive overview of the recent results obtained by the Planck Consortium. Using unprecedented maps of linear polarization at sub-millimeter wavelengths, for the first time, we were able to trace the magnetic field structure of our own Galaxy over the whole sky. I will focus on several aspects of our data analysis that show the relevance of magnetic fields in the Galactic environment, from the diffuse medium to the regions where early star formation takes place.

I will conclude my talk with interesting perspectives for the future to study the magnetic properties of the Milky Way by combining multiple probes of the interstellar medium with existing and upcoming experiments, such as Planck, LOFAR, and SKA.

 

"Eruptivni procesi u Sunčevoj koroni i njihovo širenje heliosferom"

 

Dr. sc. Tomislav Žic

Opservatorij Hvar, Geodetski fakultet Sveučilišta u Zagrebu


Mjesto i vrijeme:

Srijeda, 25. svibnja 2016. u 12:00 sati
Predavaona O-153
Sveučilišni Kampus na Trsatu
Radmile Matejčić 2
51000 Rijeka


Sažetak:

Eruptivni procesi u Sunčevoj atmosferi imaju veliki utjecaj na stanje heliosfere i Zemljina svemirskog okoliša. Koronin izbačaj predstavlja eruptivnu promjenu globalnog magnetskog polja korone. U početnoj fazi dolazi do gubitka ravnoteže magnetskog ustrojstva korone usidrenog u tromoj fotosferi. Stabilnost strukture ovisi o količini energije uskladištene u magnetskom polju, a erupciju pokreće Lorentzova sila. Bitan činitelj u razvoju nestabilnosti predstavlja sačuvanje magnetskog toka i induktivni efekti. Koronini izbačaji mogu uzrokovati globalne poremećaje koji se opažaju u obliku EUV valova u koroni ili kao kromosferski Moretonovi valovi. Lorentzova sila slabi s udaljenošću zbog induktivitetnih efekata i vodeću ulogu preuzima magnetohidrodinamički (MHD) otpor koji je posljedica nesudarnog međudjelovanja izbačaja s okolinom, tj. izmjene količine gibanja i kinetičke energije između Sunčevog vjetra i izbačaja MHD valovima bez disipacijskih procesa. Prikazat će se procesi nastanka gubitka ravnoteže, opisati popratne pojave, te objasniti heliosferska dinamika koroninih izbačaja i pripadni modeli, s ciljem poboljšanja točnosti. 
 

"NANOBLENDS BASED ON EPOXY RESIN AND STYRENIC BLOCK COPOLYMERS: STRUCTURE-PROPERTIES CORRELATION"

 

Prof. Rameshwara Adhikarija
 

Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal 


Mjesto i vrijeme:

Ponedjeljak, 23. svibnja 2016. u 15:00 sati
Predavaona O-152
Sveučilišni Kampus na Trsatu
Radmile Matejčić 2
51000 Rijeka


Sažetak:

The effective uses of epoxy resins, important class of thermosets having several technical applications, are limited by their inherent brittleness. Thus, many works have been carried out to improve their physical properties, mainly through the incorporation of flexible elastomeric domains within the brittle epoxy network. One of such ways includes the toughness modification of the resins through the addition of the block copolymers. The latter induces nanostructured morphology in the resin. In this work, we investigate the binary blends of a star shaped polystyrene-block-polybutadiene-block-polystyrene (SBS) triblock copolymer with epoxy resin, (diglycidyl ether of bisphenol-A; DGEBA), in presence of methylene dianiline (MDA) as hardener. The copolymers were epoxidized by using meta-chloroperoxybenzoic acid (MCPBA).
The interplay between macro- and microphase separation was found to occur in those blends depending upon the degree of epoxidation of the block copolymer. The presence of nanostructured morphology was attested by the optical transparency of the blends as well as of the composites with nanofiller. Consequently, the mechanical properties of the blends could be adjusted by controlling the degree of epoxidation and amount of the block copolymer used to prepare the blends. A brittle to ductile transition was observed in the copolymer modified epoxy resin. The correlation between morphology and micromechanical deformation behavior of the materials will be presented.
 

"Što je masa nestabilne čestice?"

 

Dr. sc. Branimir Zauner
 


Mjesto i vrijeme:

Srijeda, 30. ožujka 2016. u 12:00 sati
Predavaona O-153
Sveučilišni Kampus na Trsatu
Radmile Matejčić 2
51000 Rijeka


Sažetak:

U fizici elementarnih čestica uobičajeno je da se kratkoživuča stanja, odn. rezonancije, opisuju pomoću dva suštinski različita skupa parametara - tzv. polarnim i Breit-Wigner parametrima. Prvi su matematički dobro definirana svojstva amplitude raspršenja, dok bi potonji trebali biti "fizikalniji" jer proizlaze iz poopćenja renormalizirane mase čestica. U predavanju će biti predstavljeni problemi koje ta dvojakost izaziva kako eksperimentalnim, tako i teorijskim fizičarima elementarnih čestica, te istraživanja koja idu u smjeru rješavanja te situacije.