December 22, 2024

Rijeka tehnologije / Rijeka of Technologies

On initiative of Professor Saša Zelenika, and in the framework of the events marking the 45th anniversary of the University of Rijeka, the event “Rijeka of Technologies” was held from September 26th to 28th, 2018. The event was synergistically organized by the constituents of the University of Rijeka that are home to more than 5,000 students: the Faculties of Engineering, of Civil Engineering and of Maritime Studies, the Department of Physics and the Centre for Micro- and Nanosciences and Technologies, as well as the Technical School, the Association of Technical Culture, the Youth House and the Academic Astronomical Society in Rijeka.

The aim of the Rijeka of Technologies event was to promote and broaden the educative and scientific activities carried on in the fields of technical and natural sciences. During the event, the scientists have hence presented in public spaces their work, while the citizens had occasion to get acquainted with state-of-the-art technological achievements in Rijeka that generate societal progress and the enhancement of life conditions, but also create positive economic impacts and have been and still are an important part of the lives, the identity and the prosperity of the city and the citizens of Rijeka. Instead of brain drain, these activities generate hence added value, revenues and employment of talents in Croatia. Indeed, most of the senior students of the technical faculties in Rijeka already participate in some form of active work, while the data of the Croatian Bureau of Employment clearly indicate that the high-school and university graduates of these professions are wanted and regularly find employment very soon after graduation. Throughout the interesting and comprehensive three-day program of the event, the broad public had thus occasion to witness how the hard, devoted and, often, team work of teachers and young scientists brings about impressive results and contributes to the development of an advanced and economically prosperous society. Especially noted during the event were the lectures of Zoran Vakula, head meteorologist of Croatian television, and Korado Korlević, astronomer and scientific enthusiast from Višnjan, but also the round table “STEM education: current state and perspectives” and the excellent short presentations of the young scientists from the involved constituents of the University.


Na inicijativu prof. dr. sc. Saše Zelenike, a u okviru obilježavanja 45. obljetnice Sveučilišta u Rijeci, od 26. do 28. rujna 2018. održana je manifestacija „Rijeka tehnologije“. Manifestaciju su sinergijski organizirale sastavnice Sveučilišta u Rijeci na kojima studira više od 5.000 studenata: Tehnički, Građevinski i Pomorski fakultet, Odjel za fiziku i Centar za mikro- i nanoznanosti i tehnologije, te Tehnička škola, Zajednica tehničke kulture, Dom mladih i Akademsko astronomsko društvo iz Rijeke.

Cilj Rijeke tehnologije je promocija i popularizacija obrazovanja i znanosti na područjima tehničkih i prirodnih znanosti. Tijekom manifestacije su znanstvenici u javnim prostorima govorili o svome radu, dok su građani imati priliku upoznati se s riječkim modernim tehnološkim postignućima koja dovode do napretka društva te poboljšanja životnih uvjeta, ali stvaraju i značajne ekonomske učinke, te su bile i jesu važan dio života, identiteta i blagostanja Rijeke i Riječana. Umjesto odljeva mozgova, one generiraju dodanu vrijednost, prihode i zapošljavanje talenata u RH. Doista, većina studenata riječkih fakulteta tehničke struke već na zadnjim godina studija radi, a podaci Hrvatskog zavoda za zapošljavanje jasno pokazuju da su maturanti i diplomanti ovih struka jako traženi i u pravilu se odmah zapošljavaju. Kroz zanimljiv i sveobuhvatan program manifestacije kroz čak tri dana je tako javnost imala prilike vidjeti kako ustrajan, predan i, često, timski rad edukatora te mladih znanstvenika dovodi do impresivnih rezultata i razvoja naprednog te gospodarski prosperitetnog društva. Posebno su zapažena tijekom manifestacije bila predavanja Zorana Vakule, glavnog meteorologa HRT-a, te Korada Korlevića, astronoma i popularizatora znanosti iz Višnjana, ali i održana tribina „STEM obrazovanje: stanje i perspektive“ te izvanredne kratke prezentacije mladih znanstvenika s involviranih sastavnica Sveučilišta.

Razvoj sustava računalnog praćenja gibanja ljudskog tijela

Paralelno s radom na elektro-mehaničkoj konstrukciji i na sustavu upravljanja rehabilitacijskog uređaja, član našega tima izv. prof. dr. sc. Kristijan Lenac radi na razvoju sustava računalnog praćenja gibanja ljudskog tijela (video), koji će značajno pomoći u razvoju još učinkovitijih algoritama za upravljanje rehabilitacijskim uređajem, ali i na razvoju sučelja temeljenog na virtualnoj stvarnosti, koje će pacijentima biti od velike pomoći pri učinkovitom korištenju uređaja.

18th International EUSPEN Conference 2018, Venice, Italy

Employees of the Precision Engineering Laboratory actively participated at the 18th EUSPEN International conference, held from June 4th to June 8th 2018 in Venice, Italy.

In the session Advances in Precision Engineering, our team presented three papers:

Characterisation of positioning performances of a mechatronics device actuated via a frictionless voice-coil actuator.‘ by authors E. Kamenar and S. Zelenika;

Experimental approach to establishing a model of nanoscale friction‘ by authors M. Perčić, S. Zelenika, I. Mezić, R. Peter and N. Krstulović;

Koopman-based model predictive control of a nanometric positioning system‘ by authors E. Kamenar, M. Korda, S. Zelenika, I. Mezić and S. Maćešić.

  

Projekt predstavljen u Jutarnjem listu

Projekt razvoja rehabilitacijskog uređaja koji se uspješno provodi na Tehničkom fakultetu je predstavljen na mrežnim stranicama Jutarnjeg lista:

http://native.jutarnji.hr/hrvatskistvaratelji/

http://native.jutarnji.hr/hrvatskistvaratelji/tehnicki.html

Ispitivanje osjetnika napetosti mišića ruke

Da bi se odredio početak pokretanja motora na uređaju za rehabilitaciju, potrebno je mjeriti napetost mišića ruke, što je u Laboratoriju za precizno inženjerstvo student Nino Dujmešić kroz rad na studentskom projektu uspješno ostvario.

Projekt Tehničkog fakulteta dobitnik nagrade Moj ZABA Start natječaja

Projekt “Razvoj mehatroničkog uređaja za rehabilitaciju pacijenata sa smanjenom funkcionalnošću gornjih ekstremiteta” istraživačke skupine s Tehničkog fakulteta u Rijeci, u suradnji s KBC-om te Medicinskim fakultetom u Rijeci, prijavljen na natječaj Zagrebačke banke “Moj ZABA Start“, odabran je kao dobitnik treće nagrade i 80.000 kuna u kategoriji “Kultura i znanost“. U predmetnoj kategoriji prijavljeno je bilo ukupno 209 projektnih prijava, dok je u svim kategorijama ukupno bilo 680 projektnih prijava od kojih je samo njih 11 na kraju osvojilo donacije.

U nagrađenom projektu sudjeluju prof. dr. sc. Saša Zelenika, izv. prof. dr. sc. Kristijan Lenac, dr. sc. Ervin Kamenar, asistenti Petar Gljušćić i Tea Arrigoni s Tehničkog fakulteta u Rijeci i Centra za mikro- i nanoznanosti i tehnologije Sveučilišta, te prof. dr. sc. Tea Schnurrer Luke Vrbanić s Medicinskog fakulteta i KBC-a Rijeka.

 

http://www.mojzabastart.hr/home/tko-su-dobitnici

http://novilist.hr/Promo-sadrzaji/Zaba-proglasila-pobjednike-natjecaja-Moj-Zaba-Start

https://www.vecernji.hr/biznis/za-inovativne-projekte-milijun-kn-1203699

http://www.jutarnji.hr/Promo/zaba-proglasila-pobjednike-natjecaja-moj-zaba-start/6690393/

http://www.uniri.hr/index.php?option=com_content&view=article&id=6604%3Atrea-nagrada-projektu-riteh-a&catid=1%3Avijesti&lang=hr

http://www.riteh.uniri.hr/novosti/projekt-tehnickog-fakulteta-dobitnik-nagrade-moj-zaba-start/

https://www.tkokaze.hr/novosti/proglaseni-pobjednici-natjecaja-moj-zaba-start/

https://cropix.hr/index.php?menuid=gallery_cropix&gid=111811

http://www.bug.hr/vijesti/zaba-proglasila-pobjednike-natjecaja-moj-zaba-star/162839.aspx

https://lider.media/ukratko/foto-proglaseni-pobjednici-natjecaja-moj-zaba-start/

https://www.vecernji.hr/kultura/deset-kulturnih-i-znanstvenih-projekata-u-finalu-nagrade-moj-zaba-start-1199234

PrecEng team members presented their work at the My First Conference held on RiTeh

Our team members M. Sc. Tea Arrigoni, M. Sc. Petar Gljuščić and M. Sc. Marko Perčić presented the results of their recent work at the “My first Conference” event organized by the Faculty of Engineering, the Faculty of Civil Engineering and the Faculty of Maritime Studies of the University of Rijeka. The conference was held at the Faculty of Engineering itself and organized exclusively for the doctoral students whose research is undergoing.

The presented papers, in the form of extended abstracts, are:

Arrigoni, S. Zelenika, E. Kamenar, T. Schnurrer Luke Vrbanić, K. Lenac “Issues in the mechatronics design of a full arm rehabilitation device” – Paper

P. Gljušćić & S. Zelenika: “Modelling, optimization and application of piezoelectric vibration energy harvesting devices” – Paper

M. Perčić & S. Zelenika: “Issues in characterizing parameters influencing nanometric friction” – Paper

PrecEng istraživačka skupina s Tehničkog fakulteta u Rijeci u finalu natječaja Moj ZABA start

Projekt “Razvoj mehatroničkog uređaja za rehabilitaciju pacijenata sa smanjenom funkcionalnošću gornjih ekstremiteta” istraživačke skupine s Tehničkog fakulteta u Rijeci, u suradnji s Kliničkim bolničkim centrom te Medicinskim fakultetom u Rijeci, prijavljen na natječaj Zagrebačke bankeMoj ZABA Start“, odabran je od strane stručnog povjerenstva kao jedan od 10 finalista u kategoriji “Kultura i znanost“. U predmetnoj kategoriji prijavljeno je ukupno 209 projektnih prijava, dok je u svim kategorijama ukupno bilo 680 projektnih prijava od kojih je 30 ušlo u finale.

U projektnoj prijavi sudjeluju prof. dr. sc. Saša Zelenika, izv. prof. dr. sc. Kristijan Lenac, dr. sc. Ervin Kamenar, asistent Petar Gljušćić, i Tea Arrigoni s Tehničkog fakulteta u Rijeci te prof. dr. sc. Tea Schnurrer Luke Vrbanić sa Zavoda za fizikalnu i rehabilitacijsku medicinu KBC-a Rijeka i Medicinskog fakulteta u Rijeci.

Ukupni fond potpora za kategoriju Kultura i znanost iznosi ukupno 330.000 kn odnosno 120.000 kn za prvu, 100.000 kn za drugu i 80.000 kn za treću nagradu prema odluci Komisije. Četvrta nagrada od 30.000 kn bit će dodijeljena prema odabiru javnosti putem javnog glasovanja na www.mojzabastart.hr.

“Moj Zaba Start kroz različite natječaje podupire najinovativnije i tržišno utemeljene ideje s pozitivnim utjecajem na gospodarstvo i društvo. Pokrenut je 2013. godine te je do sada podržao ukupno 29 najboljih održivih projekata iz različitih područja po ocjeni stručne komisije i prema odabiru javnosti. Dobitnici su inovativni start up-ovi, društveno odgovorne inicijative, projekti iz područja zelenog poduzetništva i kreativne industrije te izrade aplikacija i informatičkih rješenja.”

http://www.mojzabastart.hr/home/

http://www.mojzabastart.hr/home/moj-zaba-start/o-projektu

http://www.mojzabastart.hr/home/tko-su-finalisti-ovogodisnjeg-natjecaja-moj-zaba-start4

Calibration of CNC milling machine tools by laser interferometer

In a collaboration with prof. Zoran Jurković and asist. Graciela Šterpin Valić from the Department of industrial engineering and managment positioning accuracy and repeatability of the X,Y and Z axes of the CNC milling machine were experimentally assessed.

All measurements were made using linear positioning metods. For more accurate repeatability of taking the same position, measurements of axes were performed in 3 cycles. X-axis experimental positioning were performed with 20 mm step for the 500 mm measuring range of the X-axis. Y-axis experimental positioning were performed with 20 mm step for the 320 mm measuring range of the Y-axis. Z-axis experimental positioning were performed with 5 mm step for the 95 mm measuring range of the Z-axis.

The team is currently working on the analysis of the obtained results.

 

Prof. Saša Zelenika become an expert evaluator of the European Commission!

Our member prof. Saša Zelenika was selected as an Expert evaluator of the European Commission (EC) of research infrastructure proposals submitted to the Horizon 2020 EU framework programme calls! Evaluation was held in Bruxelles, Belgimum from June 12th to June 16th 2017.

 

Laboratory for Precision Engineering and Micro- and Nanotechnologies of the Centre for Micro- and Nanosciences and Technologies

Laboratory equipping was supported by infrastructural ERDF project no. RC.2.2.06-0001: “Research Infrastructure for Campus-based Laboratories at the University of Rijeka – RISK”


         Europska unija

  Ulaganje u budućnost


                 


Bruker Dimension Icon Scanning Probe Microscope (SPM)

  • AFM and STM modules in one device.

  • Supports contact and tapping mode (closed loop control keeps the force (deflection of the beam which holds the tip) constant, which limits the contact forces to < 200 pN, i.e. a value far lower than the tapping forces of other devices – PeakForce tapping).

  • Enables measurements of elasticity modulus, adhesion, lateral force (LFM), spectroscopy and force modulation, electrochemical analysis, electric field and magnetic forces, surface potential, piezoelectric force; enables also nanolitography, …

    Option to measure in liquid for biotechnical applications and measurements with heating/cooling of the samples, …

    Imaging of measured data on 5’120 x 5’120 pixels.

  • Samples fixed to the support via a vacuum chuck can be up to few millimetres in size, with bidirectional positioning repeatability of 3 mm on a scanning area of up to 90 x 90 mm.

  • Includes heat (creep < 200 pm/min) and vibration isolation (1” Si damping cushion + compressed air → < 30 pm RMS), microscope and CCD camera, control SW, …

  • PeakForce Tapping™ is an AC imaging technique, i.e., the cantilever is oscillated but well below resonance.

  • This results in a continuous series of force-distance curves.

  • In addition to direct force control by keeping the peak force constant, a multitude of material properties can be extracted and quantified from the force-distance curve at each pixel within an image, such as modulus, adhesion force, and deformation depth.

Examples of measurements – mechanical testing of orthodontic archwires (topographies of NiTi, Rh NiTi and N NiTi):

     

Examples of measurements – ball element and sliding surface of linear guideways:

 

Keysight G200 Nanoindenter

  • The device is thermally as well as dynamically (and acoustically) isolated.

  • Electromagnetic actuation (voice coil principle), i.e. load generation: max 0.5 N with a 50 nN resolution; additional built-in high-load system with 0.1 mN … 10 N load range. Loading system stiffness (guided by leaf springs): 5.106 N/m.

  • Capacitive displacement measurement: resolution < 0.01 nm for > 500 mm displacement range. Obtainable straightness in a

    100 mm range is within 10 nm.

  • 4 samples in a 100 x 100 mm sample holder with a scanning resolution of 0.1 mm and 1 mm accuracy; automatically controlled (closed loop based on incremental encoders). Measurement of elasticity modulus and hardness according to ISO 14577.

  • Enables LFM with a ≤ 2 mN resolution and max lateral force

    ≥ 250 mN. Low-force measurements enable obtaining surface topology after indentation.

  • Berkovich, cube corner, conical, spherical and Vickers tips. System for sample visualization (10x and 40x zoom), microscope with CCD camera and data analysis SW.

Examples of measurements – mechanical testing of orthodontic archwires:

Stratasys Fortus 250mc 3D printer

  • For models with dimension of up to 254 x 254 x 305 mm, with 178 mm layer thickness and positioning accuracy of 240 mm.

  • 2 heads (building and support material).

  • FDM (Fused Deposition Modelling) technology (heating and extrusion of thermoplastics); material: ABSplus (acrylonitrile butadiene styrene).

  • Import of STL (Standard Tessellation Language) 3D models from CAD + SW for printing process optimization (including support structure optimization).

  • An additional 3D printer (Stratasys Connex 500), capable of using up to 14 different materials with different stiffness properties, available at the Faculty of Civil Engineering on same U. of Rijeka campus → PolyJet technology: similar to desktop inkjet printers, with photo polymer material hardened under UV light; printing resolution down to 16 mm.

FDM process:

  • Advantages: laser not needed, fast and secure procedure, lower power consumption, unnecessary cooling and ventilation, simple usage, low investment, low maintenance costs, small size (additional room not needed), warping effect minimised.

  • Disadvantages: surface can be rough and models can have a certain porosity, model functionality is limited by the used material, in many cases the support structure has to be used, additional mechanical processing needed, lines between layers can physically be seen, hardness of the product is lower in the direction of the printed layers, oscillations in temperature during the printing process can lead to delamination of the product; upon warming, melting and solidification processes, ABS can shrink up to few %.

Examples of 3D printed structures:

 

DAVID SLS-2 (Structured Light Technology) 3D Scanner

Structured Light Technology: The distance and the angle of the camera with respect to the projector are known, i.e. distortion of the reflected light pattern (fringes) depends on object’s geometry. Projector + camera + calibration panels + rotating table.

  • 500 mm scanning area,

  • resolution/accuracy 1‰ of the object size,

  • includes SW environment,

  • mobile with tripod,

    enables exporting data to formats compatible with standard CAD SW (e.g. STL).

Examples of measured 3D structures – dental casts: