碩士 / 嘉南藥理科技大學 / 環境工程與科學系碩士班 / 95 / In this study, the feasibility of removing chromium (VI) which is a major pollutant from the electroplating wastewater, by nano scale zero valent irons (NZVI) in sequential batch reactors assisted with electric magnetic field was evaluated. Firstly, the nano-scale zero valent irons was prepared through chemical reduction method in the laboratory. It was found that the particle size of nano-scale zero valent iron was in the range of 50 and 100 nm. and the surface area of NZVI was 80 ± 5 m2/g. This study investigated the effect of solution pH (initial pH 3、pH 5 and constant pH at 3), Fe0：Cr6+ mass ratio ( Fe0：Cr6+ = 10：1、20：1 and 40：1), initial chromium(VI) concentration ( 20 and 50 mg/L), and different kinds of aeration gases on the removal of chromium(VI) and NZVI capability for chromium(VI) removal( g-Cr6+/g-Fe0 ). In the reduction reaction, the solution pH, ORP, DO, Fe2+ ions, total iron, total Cr were also monitored or analyzed. The results showed that the removals of aqueous chromium (VI) reduced by NZVI using initial Cr6+ concentration at 20 mg/l, initial pH at 3, carbon-dioxide as aeration gas with Fe0：Cr6+ mass ratio from 10：1、20：1 and 40：1 were 39.2, 63.1 and 87.9%, respectively, after 5 batches process. By using Fe0：Cr6+ mass ratio 20：1 at different initial Cr6+ concentration (20, 50 mg/l) in 5 batch runs, the removals of Cr6+ were both 100% in first run. The following run from 2 to 5 resulted in decreasing of removal efficiency.The solution pH plays a important role on the removal of Cr6+. At initial pH 3 and pH 5, the removals of Cr6+ were almost the same ( 74.2 and 73.1% ). However, when solution pH was controlled at constant pH 3 a higher removal of Cr6+ ( 91.9 % )was observed. The removal of Cr6+ using air as aeration gas was found to be 40.7 mg which was larger than that using CO2 as aeration gas ( 31.5 mg ).

Prion is an infectious isoform of a normal cellular protein which is capable of converting the non-prion form of the same protein into the alternative prion form. Mammalian prion protein PrP is responsible for prion formation in mammals, causing a series of fatal and incurable prion diseases. (1) We constructed, for the first time, a two-component system to phenotypically monitor the conformational status of PrP in the yeast cells. In this system, the prion domain of Sup35 (Sup35N) was fused to PrP90-230, and the initial formation of the PrPSc-like conformation stimulated prion formation of Sup35N, which in turn converted soluble Sup35 into the prion isoform, leading to a detectable phenotype. Prion-like properties of PrP were studied in this novel yeast model system. Additionally, we employed this system to study amyloidogenic protein Aβ42 aggregation in the yeast model. It has been suggested that the ability to form transmissible amyloids (prions) is widespread among yeast proteins and is likely intrinsic to proteins from other organisms. However, the distribution of yeast prions in natural conditions is not yet clear, which prevents us from understanding the relationship between prions and their adaptive roles in various environmental conditions. (2) We modified and developed sequence and phenotype-independent approaches for prion detection and monitoring. We employed these approaches for prion-profiling among yeast strains of various origins. (3) Lastly, we found a prion-like state [MCS+] causing nonsense suppression in the absence of the Sup35 prion domain. Our results suggested that [MCS+] is determined by both a prion factor and a nuclear factor. The prion-related properties of [MCS+] were studied by genetic and biochemical approaches.

Στην παρούσα εργασία παρουσιάζεται η διαδικασία ανάλυσης απαιτήσεων, σχεδιασμού και υλοποίησης ενός δικτυακού τρισδιάστατου μουσείου. Παρουσιάζονται τα αποτελέσματα συνεντεύξεων με πιθανούς χρήστες, και η διαδικασία ανάλυσης των απαιτήσεων που θα έχουν από μία τέτοια εφαρμογή, η διαδικασία σχεδιασμού των υποσυστημάτων της εφαρμογής και η υλοποίηση τους. Η εφαρμογή έχει ικανοποιητική απόδοση, ενώ με τον σχεδιασμό και την υλοποίηση του συστήματος δυναμικής μεταφόρτωσης αντικειμένων, δίνει την δυνατότητα στον χρήστη να ξεκινάει την περιήγηση του στον χώρο του μουσείου ενώ ταυτόχρονα να μεταφορτώνονται τα αντικείμενα στο παρασκήνιο. Έτσι ο χρόνος αναμονής για την εκκίνηση της εφαρμογής είναι μικρός και σε εφαρμογές όπου αναμένεται ο χρήστης να κινείται αργά μέσα στον χώρο ζητώντας πληροφορίες για τα εκθέματα η περιήγηση γίνεται ομαλά, χωρίς να αντιληφθεί την διαδικασία μεταφόρτωσης. Επίσης ο σχεδιασμός της βάσης δεδομένων είναι τέτοιος ώστε να είναι επεκτάσιμος και να μπορεί να ακολουθήσει τα πρότυπα (standards) που δίνονται από διεθνείς οργανισμούς για την περιγραφή μουσειακών εκθεμάτων, ενώ είναι εύκολη η χρήση της ίδιας βάσης για την εξόρυξη της πληροφορίας σε απλή πύλη (portal). / The process of collection and analysis of requirements and the design and development of the application is presented in this project. The performance of application that is developed is considered to be satisfactory. By embedding the dynamic downloading algorithm, there is no need for prefetching of the 3D objects and that leads to very small waiting time for the application to start running. Meanwhile the 3D objects are downloaded while the user walks through the scene. In scenes like virtual museums etc where the user doesn’t walk fast from one room to the other, but stays in front of an object to get more info, the walkthrough is continuous and the downloading process isn’t noticeable by the user. Also, the database has such a design that can easily include well known standards for museum exhibits. Apart from the client application, the data stored can be retrieved from portals and thus a site edition of the virtual museum is easy to be done.

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Particulate metal matrix composites

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