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AVTOMATIZIRANA LINIJA ZA TOPLOTNO OBDELAVO Al ODLITKOV
Peter Vodušek, 2011, diplomsko delo

Opis: V diplomski nalogi je predstavljena avtomatizacija linije za toplotno obdelavo Al odlitkov. V nalogi je opisana strojna in programska oprema, ki je bila uporabljena pri realizaciji linije. Podrobno je predstavljen krmilni sistem SIMATIC S7-200, sestavni moduli, programska oprema STEP 7 Micro/WIN, s katero je bilo izvedeno programiranje krmilnika in programska oprema WSCAD, ki smo jo uporabili za načrtovanje krmilnega sistema. V nalogi je še predstavljen načrt za nadgradnjo linije v primeru povečanja obsega proizvodnje Al odlitkov, kjer so podrobneje predstavljene posamezne komunikacijske strukture avtomatiziranih procesov.
Ključne besede: transportna naprava, žarilna peč, avtomatizacija, programljivi krmilnik, industrijska omrežja, SIMATIC S7-200, STEP 7 Micro/WIN, WSCAD
Objavljeno: 17.03.2011; Ogledov: 1604; Prenosov: 218
.pdf Polno besedilo (4,03 MB)

3.
Using neural networks in the process of calibrating the microsimulation models in the analysis and design of roundabouts in urban areas
Irena Ištoka Otković, 2011, doktorska disertacija

Opis: The thesis researches the application of neural networks in computer program calibration of traffic micro-simulation models. The calibration process is designed on the basis of the VISSIM micro-simulation model of local urban roundabouts. From the five analyzed methods of computer program calibration, Methods I, II and V were selected for a more detailed research. The three chosen calibration methods varied the number of outgoing traffic indicators predicted by neural networks and a number of neural networks in the computer program calibration procedure. Within the calibration program, the task of neural networks was to predict the output of VISSIM simulations for selected functional traffic parameters - traveling time between the measurement points and queue parameters (maximum queue and number of stopping at the roundabout entrance). The Databases for neural network training consisted of 1379 combinations of input parameters whereas the number of output indicators of VISSIM simulations was varied. The neural networks (176 of them) were trained and compared for the calibration process according to training and generalization criteria. The best neural network for each calibration method was chosen by using the two-phase validation of neural networks. The Method I is the calibration method based on calibration of a traffic indicator -traveling time and it enables validation related to the second observed indicator – queue parameters. Methods II and V connect the previously described calibration and validation procedures in one calibration process which calibrates input parameters according to two traffic indicators. Validation of the analyzed calibration methods was performed on three new sets of measured data - two sets at the same roundabout and one set on another location. The best results in validation of computer program calibration were achieved by the Method I which is the recommended method for computer program calibration. The modeling results of selected traffic parameters obtained by calibrated VISSIM traffic model were compared with: values obtained by measurements in the field, the existing analysis methods of operational roundabouts characteristics (Lausanne method, Kimber-Hollis, HCM) and modeling by the uncalibrated VISSIM model. The calibrated model shows good correspondence with measured values in real traffic conditions. The efficiency of the calibration process was confirmed by comparing the measured and modeled values of delays, of an independent traffic indicator that was not used in the process of calibration and validation of traffic micro-simulation models. There is also an example of using the calibrated model in the impact analysis of pedestrian flows on conflicting input and output flows of vehicles in the roundabout. Different traffic scenarios were analyzed in the real and anticipated traffic conditions.
Ključne besede: traffic models, traffic micro-simulation, calibration of the VISSIM model, computer program calibration method, neural networks in the calibration process, micro-simulation of roundabouts, traffic modeling parameters, driving time, queue parameters, delay
Objavljeno: 02.06.2011; Ogledov: 3012; Prenosov: 204
.pdf Polno besedilo (13,21 MB)

4.
REŠITEV ZA EVIDENTIRANJE DELOVNEGA ČASA Z MOBILNIM TELEFONOM
Ana Malešič, 2011, magistrsko delo

Opis: V magistrski nalogi je predstavljena programska rešitev za evidentiranje delovnega časa z mobilnim telefonom s pomočjo tehnologije Modri-zob. Programska rešitev je bila preverjena s pomočjo emulatorja Wireless Toolkit 2.5.2 in štirih telefonov. Programska rešitev poleg evidence prisotnosti omogoča tudi pomoč pri generiranju mesečnih poročil po opravljenih dejavnostih. Razvita je s pomočjo orodja Java ME in ostalimi pomembnimi podpornimi orodji. Cilj magistrske naloge je bil ugotoviti ali lahko razvita mobilna rešitev nadomesti obstoječo rešitev na osnovi magnetnih kartic. V uvodnem delu magistrske naloge je predstavljen problem, okolje, cilji naloge, predvideni rezultati naloge in metode dela. Izvedena je primerjava med tehnologijama NFC (Near Field Communication) in Modri-zob. Sledi opis uporabljenih orodij in njihovih lastnosti ter pomen pri razvoju programske rešitve. Razvoj programske rešitve je izveden po načelih prototipnega pristopa in zajema analizo, načrtovanje, implementacijo, testiranje ter predlog prototipa programske rešitve s prikazi pomembnejših delov kode. Z metodama Backer in Abacon je izvedena primerjava med novo in obstoječo programsko rešitvijo. Sledi SWOT analiza nove rešitve. S pomočjo orodja SPSS 17.0 je narejena analiza rezultatov spletne ankete dvesto dveh anketiranih o prednostih in slabostih uporabe magnetne kartice ali mobilnega telefona za evidentiranje delovnega časa. Rezultati so pokazali, da sicer večina anketiranih pripisuje več prednosti uporabi mobilnega telefona, a hkrati ne bi dovolili, da se programska rešitev naloži na njihove privatne telefone. V zaključku magistrske naloge je ocena učinkov, pogojev za uvedbo programske rešitve za mobilne telefone v organizacijo, potrebnih tehničnih in finančnih sredstev ter možnosti za nadaljnji razvoj programske rešitve za mobilne telefone.
Ključne besede: • Java Micro Edition • Modri-zob tehnologija • Mobilna tehnologija • Programska rešitev za mobilne telefone za evidentiranje delovnega časa • Uvajanje informacijskega sistema v organizacijo
Objavljeno: 18.11.2011; Ogledov: 1429; Prenosov: 162
.pdf Polno besedilo (2,33 MB)

5.
Hygiene monitoring systems for hospital textile laundering
Sabina Fijan, Sonja Šostar-Turk, 2007, strokovni članek

Opis: The main aim of washing laundry is to remove soils and microorganisms from infected and dirty textiles and achieve clean, fresh and disinfected textiles ready for use. Textiles undergo laundering processes, which include: soil removal with special laundering agents; bleaching; disinfecting; and finally neutralising and rinsing. Because textiles from hospitals may contain many kinds of pathogenic -bacteria, fungi and viruses, it is essential that the laundering process has not only a cleaning effect but also an antimicrobial one. Since users of hospital textiles are often patients with a weakened immune -system, it is recommended that best practice and common sense be employed when washing and -disinfecting hospital textiles. Most people assume that the laundry returned to them is in fact clean and, therefore, safe. Experience encourages all infection control teams to take laundering very seriously. (1-15) Inappropriately disinfected textiles are one of the possible sources of nosocomial infections for patients. There are reports of hospital textiles being the source of nosocomial infection with streptococci, enterococci, Bacillus cereus, staphylococci and coliforms.(5-9) There are some documented cases where staff in hospital wards and laundries have been infected with scabies, fungi, salmonellas, gastroenteritis viruses, hepatitis A viruses and coxiellas after treating dirty laundry.
Ključne besede: textile care, hospital laundry, laundry hygiene, micro-organisms, washing quality parameters, sanitary microbiological parameters, hospital-acquired disease prevention, sanitary measures
Objavljeno: 31.05.2012; Ogledov: 1477; Prenosov: 10
URL Polno besedilo (0,00 KB)

6.
Implementing hygiene monitoring systems in hospital laundries in order to reduce microbial contamination of hospital textiles
Sabina Fijan, Sonja Šostar-Turk, Avrelija Cencič, 2005, izvirni znanstveni članek

Opis: As textiles sent to hospital laundries contain many types of pathogenic organisms, it is important that laundering not only has an appropriate cleaning effect but also has a satisfactory disinfecting effect. Critical to this process is the maintenance of an appropriate hygiene level in the clean area of laundries in order to prevent recontamination of textiles from manual handling when ironing, folding, packing etc. The aims of this study were to evaluate the hygienic state of a hospital laundry, to introduce continuous sanitary measures, and to introduce a continuous hygiene monitoring system with an infection control programme. Two systems for evaluating hospital laundry hygiene were combined: HACCP principles (hazard analysis and critical control points) and RAL-GZ 992 standards (quality assurance standard for textile care of hospital laundry). Evaluation of the hygienic state of the hospital laundry was carried out by evaluating the number and types of micro-organisms present at the critical control points throughout the whole laundering process, using RODAC agar plates for surface sampling and the pour plate method for investigating water samples. The initial examination showed that the sanitary condition of the laundry did not reach the required hygiene level. Therefore, fundamental sanitation measures were instituted and the examination was repeated. Results were then satisfactory. The most important critical control point was the chemothermal laundering efficiency of the laundering process. To prevent micro-organisms spreading into the entire cleanworking area, it is important that, in addition to regular sanitary measures such as cleaning/disinfecting all working areas, technical equipment and storage shelves etc., regular education sessions for laundry employees on proper hand hygiene is undertaken and effective separation of the clean and dirty working areas is achieved.
Ključne besede: textile care, hospital laundry, laundry hygiene, micro-organisms, washing quality parameters, sanitary microbiological parameters, hospital-acquired disease prevention, sanitary measures
Objavljeno: 01.06.2012; Ogledov: 1475; Prenosov: 11
URL Polno besedilo (0,00 KB)

7.
Antimicrobial disinfection effect of a laundering procedure for hospital textiles against various indicator bacteria and fungi using different substrates for simulating human excrements
Sabina Fijan, Srečko Koren, Avrelija Cencič, Sonja Šostar-Turk, 2007, izvirni znanstveni članek

Opis: Recent studies confirm the increase of nosocomial infections and microbial resistance. One of the possible causes is infected textiles due to inappropriate laundering procedures. Most Slovenian laundries use thermal laundering procedures with high energy and water consumption to disinfect hospital textiles. In addition to this fact, there is an increasing number of hospital textiles composed of cotton/polyester blends that cannot endure high temperatures of thermal disinfection. On the other hand, decreasing the temperature of laundering procedures enhances the possibility of pathogenic microorganisms to survive the laundering procedure. In our research, we determined the antimicrobic laundering effect by simulating a common laundering procedure for hospital textiles in the laboratory washing machine at different temperatures by the use of bioindicators. Enterococcus faecium, Staphylococcus aureus, Mycobacterium terrae, Enterobacter aerogenes, and Pseudomonas aeruginosa were used for determining the antibacterial laundering effect. Candida albicans was used for determining the antifungal laundering effect. Swine blood, artificial sweat, and swine fat were used as substrates for simulating human excrements and were inoculated together with the chosen microorganisms onto cotton pieces to simulate real laundering conditions. It was found that E. faecium, S. aureus, E. aerogenes, and P. aeruginosa survivedat 60 °C, but no microorganisms were found at 75 °C.
Ključne besede: textile care, hospital laundry, laundry hygiene, micro-organisms, bioindicators, disinfection effect, hospital-acquired disease prevention, sanitary measures
Objavljeno: 01.06.2012; Ogledov: 1449; Prenosov: 8
URL Polno besedilo (0,00 KB)

8.
Numerical modelling of micro-pitting of gear teeth flanks
Gorazd Fajdiga, Jože Flašker, Srečko Glodež, Trevor K. Hellen, 2003, izvirni znanstveni članek

Opis: A two-dimensional computational model for simulation of contact fatigue of gear teeth flanks is presented. In the model, it is assumed that the initial crack of length 0.015 mm is initiated at the surface due to previous mechanical or heat treatment of the material as well as a consequence of the running in process. The discretized model with the initial crack is then subjected to normal contact pressure, which takes into account the elasto-hydro-dynamic (EHD) lubrication conditions, and tangential loading due to friction between contacting surfaces. The model also considers the moving contact of gear flanks, fluid trapped in the crack and residual stresses due to heat treatment of the material on crack propagation. The virtual crack extension (VCE) method, implemented in the finite element method, is then usedfor simulating the fatigue crack growth from the initial crack up to the formation of the surface pit. The computational results show that the initial surface crack of length 15 m and the considered boundary conditions lead to the appearance of very small surface pits, which can be termed as micro-pitting on gear teeth flanks. The numerical results correspond well withavailable experimental data.
Ključne besede: machine elements, gearing, fracture mechanics, numerical analysis, micro pitting, pitting simulation, matematical model, fatigue, contact mechanics, crack propagation
Objavljeno: 01.06.2012; Ogledov: 1082; Prenosov: 0

9.
Particles formation and particle design using supercritical fluids
Željko Knez, Eckhard Weidner, 2003, pregledni znanstveni članek

Opis: Major recent advances. Particle formation and design of solid particles and powdery composites with unique properties is at the moment a major developmentof supercritical fluids (synonymsČ dense gasses, dense fluids, highpressure) applications. This review will focus on recent advances and on fundamentals of these processes and their applications.
Ključne besede: chemical processing, high pressure technology, micronization, supercritical fluids, micro-particles, nano-particles, powder generation, crystallization, particles from gas saturated solutions
Objavljeno: 01.06.2012; Ogledov: 1250; Prenosov: 8
URL Polno besedilo (0,00 KB)

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