Dissertations / Theses on the topic 'Rubber band'

碩士<br>國防醫學院<br>牙醫科學研究所<br>87<br>英文摘要 The purpose of the present study were to understand the possible mechanisms in the cyclosporin (CSA)-induced tooth migration by (1) evaluating the effects of CSA on orthodontic induced tooth movement and (2) observing the bony changes around dental alveolar under both effect of the CSA and the orthodontic therapy. Sixty-four 5-week old male Sprague-Dawley rats were separated into test and control groups. Rats in the experimental group daily received CSA, 10mg or 30mg/kg body weight (16 rats for each dosage), in mineral oil by gastric feeding for two weeks for inducing the pathological alterations. However, control rats received mineral oil only. Then, an orthodontic elastic ring was inserted on left maxillary central incisor by using two mosquito hemostats. Inter-dental distance between two incisors was assessed at before, immediately after, 5-, 15-, 30-, 60-minuits, and 1- and 3-days of the experiments from the impressed stone models. Animals were sacrificed at day-1 and day-3 for sequential light microscopy histopathological and histometric observations of the alveolar bone turnover in the region. Results showed that significantly increased tooth movement was noted in CSA treated rats at immediately after, 15, 30 and 60 minutes after the band insertion. By light microscopy, the bony area was decreased, however, the osteoid parameters (area and thickness) were increased after CSA therapy. The findings suggest that CSA can aggravate the orthodontic band induced tooth movement, which might play an important role, other than the gingival overgrowth, in CSA-induced tooth migration. Key words: tooth movement, dental alveolar bone, cyclosporin

碩士<br>國立虎尾科技大學<br>多媒體設計系數位內容創意產業碩士班<br>104<br>In this study, hoping the birth of a rubber band weaving industry has developed into a high added value of cultural and creative industries design success stories, as related to the future to promote the process of change and innovation woven basis. Collection processes and braiding origin related literature, research product development and the art of weaving technology, the use of rubber band weaving techniques, learn the art of weaving in a special sense of cultural and creative product development process is the accu-mulation of the early people of Taiwan wisdom of life, is precious intangible cultural assets and rich cultural elements, but can be applied to research and development of cultural and creative industries. Weaving in response to social changes, the development of many innovative weaving techniques, in order to prevent the reduction of traditional industries increasingly, in response to good business manner and woven goods and marketing pipeline, so that weaving industry to flourish. In this era of digital technology, people use the tools and play "phone, tablet, game," the topic is actually replaced by "colored rubber bands", color rubber band in the world set off a wave of craft, knitting is a big push hands , does this now, the children always with a colored rubber band weave woven bracelet, you know how much of the charm colored rubber bands.

Silicone rubber insulators have been replacing conventional insulators made from toughened glass and porcelain in the power system, due to the non-wetting properties of silicone rubber insulation housing. However, silicone elastomers will eventually wet-out leading to leakage current and dry-band arcing giving rise to erosion of the silicone housing material, and eventually insulation failure. Well-established formulations of insulation housing composites have been developed and validated for erosion performance using the standard inclined plane tracking and erosion test, yet no such formulations have been developed and validated for DC. With the assumption that equivalent performance will be obtained, an adjustment to the creepage distance has been the measure taken in using the AC insulators for DC, without taking into consideration the differing aspects of the DC as compared to the AC dry-band arcing. This practice questions the existing DC insulators as an unknown entity that requires further investigation to ensure the reliability of the power supply. In addition recent demands have been raised to develop housing composites specifically for DC outdoor insulation, particularly with the increased interest in DC. It follows that developing a standard DC inclined plane tracking and erosion test is necessary for the development of more suitable materials for outdoor DC insulation applications. This thesis provides a thorough study of the DC dry-band arcing mechanism as opposed to the well understood mechanism of the AC dry-band arcing and provides a mechanistic understanding to the dry-band arcing leading to erosion as a foundation for the development of a standard DC inclined plane tracking and erosion test. To this end, the influence of inorganic fillers in silicone rubber on resisting erosion due to dry-band arcing is also presented, as an essential step towards obtaining more suitable silicone composite for DC outdoor insulation applications.

abstract: This paper presents a theoretical model for evaluating flashover performance of insulators under contaminated conditions. The model introduces several new features when compared with existing models such as, the formation of dry bands, variations in insulator geometry and surface wettability. The electric field distribution obtained from software for 3-Dimensional models along with form factor are used to determine the dimensions of the dry bands and the onset of arcing. The model draws heavily from experimental measurements of flashover voltage and surface resistance under wet conditions of porcelain and composite insulators. The model illustrates the dominant role played by the insulator shape and housing material on the flashover performance.<br>Dissertation/Thesis<br>M.S. Electrical Engineering 2012

碩士<br>國立高雄師範大學<br>工業科技教育學系<br>106<br>The rubber-band power car was selected as the curriculum topic to practice the STEAM (Science, Technology, Engineering, Art and Mathematics) integration curriculum in a rural elementary school. In this action research, teachers apply practical courses, group cooperation learning, problem solving and creativity to evaluate the leaning effect of the students. The participants of this study are fourth-grade student. In this study, teaching data such us worksheet, student’s interviews, feedback and researcher’s reflection are used to analyze the effect of STEAM curriculum. The results show that the abilities of students such as knowledge, problem solving, use of thinking and creativity can be improved via this STEAM integrate curriculum. The abilities of researcher such as plan curriculum, teaching problem solving, research and discussion researcher’ reflection can be improved simultaneously via this action research.

L’ipertensione arteriosa rappresenta una delle condizioni più frequenti nella popolazione generale con una prevalenza stimata di 1 miliardo di persone, destinata ad aumentare con l’invecchiamento della popolazione globale. La denominazione di “killer silenzioso” sintetizza la sua frequente asintomaticità e le sue sequele in termini di complicanze cardiovascolari (infarto del miocardio), renali, cerebrali e del sistema arterioso periferico. La terapia antiaggregante e anticoagulante rappresenta uno dei cardini della prevenzione primaria e secondaria di queste condizioni, delle quali l’ipertensione è una delle cause principali. Nel 2010, il clopidrogel è stato il secondo farmaco più prescritto al livello mondiale, con un ricavato di 9 miliardi di dollari. Con il diffondersi dell’utilizzo di questi farmaci nella popolazione aumenta però l’incidenza di eventi avversi, specie emorragici, che rappresentano un temibile effetto collaterale, con un rischio di sanguinamento dal tratto gastrointestinale dall’1.5 al 4.5%. La malattia emorroidaria è la più frequente causa di sanguinamento anorettale e colpisce, con almeno un episodio, fino al 50% della popolazione sopra i 50 anni. In pazienti in terapia antiaggregante o anticoagulante gli episodi emorragici correlati all’emorroidi possono essere più severi e meno responsivi alla terapia medica. In questi casi, l’intervento ambulatoriale o chirurgico rappresenta l'unica opzione, ma comporta rischi aggiuntivi di eventi emorragici postoperatori, se la terapia viene continuata, o di nuovi eventi cardiovascolari e cerebrali per sospensione prudenziale della terapia nel periodo perioperatorio. La presente tesi è espressione di un filone di ricerca sulla malattia emorroidaria in termini di anatomia, biologia vascolare e fisiopatologia che il sottoscritto ha intrapreso durante il dottorato e che ha fatto da terreno di coltura a uno studio pilota su una nuova tecnica chirurgica, lo Sclerobanding, che in modo non invasivo, economico e senza anestesia (o se richiesto con anestesia locale) si propone di trattare la malattia emorroidaria e il sintomo principale, il sanguinamento, anche in pazienti ad alto rischio nei quali la sospensione della terapia anticoagulante/antiaggregante per un intervento tradizionale potrebbe comportare un rischio aggiuntivo per il presentarsi di eventi trombotici legati alla sospensione del trattamento e al fenomeno della rebound ipercoagulability. Tale studio è stato preceduto da una descrizione della tecnica sulla rivista ufficiale della Società Europea di Coloproctologia (ESCP), Colorectal Disease e da uno studio sulla fattibilità della metodica in pazienti in buone condizioni di salute pubblicato nel 2021 sul Journal of Clinical Medicine e che rappresenta il terzo capitolo di questa tesi. Il percorso del dottorato mi ha consentito una conoscenza più approfondita sul tema dell’ipertensione e delle sue conseguenze. La possibilità di unire queste nuove conoscenze, anche in termini di trattamenti anticoagulanti/antiaggreganti, per la realizzazione di uno studio su un tema, quello della malattia emorroidaria, a me caro in quanto chirugo colorettale, è stata per me fonte di soddisfazione e di arricchimento culturale. La tesi è cosi strutturata: Il Capitolo I, tratta dell’anatomia, biologia vascolare, fisiologia e fisiopatologia della malattia emorroidaria ed è stato pubblicato nel 2020 in Reviews on Recent Clinical Trials. Il Capitolo II descrive, in una chiave di evoluzione storica, gli interventi e le procedure ambulatoriali per il trattamento della malattia emorroidaria ed è stato pubblicato nel 2021 sulla rivista scientifica Frontiers in Surgery . È stato tra i 10 articoli più letti della rivista nel 2021. Il Capitolo III descrive uno studio di fattibilità e di sicurezza dello Sclerobanding su 97 soggetti non in terapia anticoagulante ed è stato pubblicato sul the Journal of Clinical Medicine. Il Capitolo IV è, infine, uno studio pilota sulla sicurezza, la fattibilità dello Sclerobanding in un campione di 51 pazienti ad alto rischio in terapia anticoagulante e antiaggregante, sottoposti alla procedura senza interrompere la terapia e che rappresenta la parte sperimentale della presente tesi.

Most of us are familiar with stretching and shooting rubber bands. However, it is not immediately obvious to state which side of the rubber band will hit a predetermined target first. When a rubber band is stretched and suddenly released an axial stress wave propagates towards the end it is divides the rubber band into a stretched and relaxed area. As the wave reaches the end it reflects and causes a compression wave that propagates backwards causing dynamic buckling if the length of the compressed area is larger than the Euler critical length. If the elastic became unconstrained in a similar manner to shooting rubber bands, it is unknown whether buckling would occur and how it would affect the trajectory of the elastic. Using high speed photography we find dynamic buckling occurs when shooting rubber bands. Using a Neo-Hookean model for the rubber band we find that the wavelength is proportional to the thickness and the square root of the inverse stretch ratio. Moreover, we analyze the trajectory of the rubber band when shot by developing a model of the front and back speeds using the propagation of stress waves in rubber. We conclude that the both front and back speeds are proportional to a fraction of the speed of sound in the material based on the amount of stretching. Using the front and back speed scaling we show that our analysis is valid only for short time scales since at larger time scales the effects of the rubber band curvature and the rotation applied when launched tend to dominate.<br>2016-12-21T00:00:00Z