Papers by Keyword: Fixation

Abstract: The recovery of a fractured femur using the plate and screw internal fixation. The plate internal fixation is made of metal has good mechanical strength, but causes allergic reactions, secondary surgery, stress shielding and high costs. Evaluation of the lack of metal, now developed biodegradable polymers use Polylactide (PLA) and Poly ɛ-caprolactone (PCL). The advantages of PLA and PCL materi-als can control the rate of degradation and increase mechanical strength. Manufac-turing processes of the plate fixation internal using cold isotactic pressing. Inde-pendent variable on the PLA/PCL blends from 90/10, 80/20, 70/30, and 60/40 wt% and tested for FTIR, XRD, SEM, density and porosity. Result from adding PCL make the degree of crystallinity is decreased significantly. The formation of semi-crystalline the with peak width smaller and the crystal size bigger in the 60PLA sample. PLA/PCL blends largely formed bonding and some immiscibility in the form of small flakes and cavities after the addition of PCL content. Large cavities reduce density and increase porosity which can affect mechanical proper-ties. 90PLA sample has high density and low porosity of 1,186 g/cm3 and 4% porosity, respectively.

Abstract: In this paper, the relationship is studied by spectrophotometric method between the structure of reactive yellow X-R, reactive yellow K-6G, reactive yellow KN-GR, reactive yellow M-5G, reactive yellow M-3RE, reactive yellow EF-3R and their colors, poplar veneer dyeing characteristic parameters S, E, R, F values, exhaustion curves and fixation curves. The results showed that longer conjugated system and better coordination of electron donor and acceptor group and smaller steric hindrance generates longer absorbance wavelength. The S value of six active dyes is reactive yellow X-R> reactive yellow KN-GR> reactive yellow K-6G> reactive yellow M-5G> reactive yellow M-3RE> reactive yellow EF-3R, the R and E and F value is reactive yellow M-3RE> reactive yellow M-5G> reactive yellow EF-3R> reactive yellow X-R> reactive yellow KN-GR> reactive yellow K-6G. The exhaustion and fixation rate is increasing with the increasing of time, except that the exhaustion containing single chlorine-triazine is decreasing within 10min after addition of alkali.

Abstract: Due to rapid developments within the family of rare-earth materials innovative electrical machines can nowadays be used as high efficient generators in various power, as well as rugged constructed machines for automobile battery based propulsion in hybrid and full electric vehicles. The production of different motor concepts spread into different design variants and creates complex variations especially regarding the rotor. Deriving from various research projects, the handling of the permanent magnet components is investigated, including the development of new assembly and fixation methods.

Abstract: This work resolves a real problem of assembling the hold-on component unit with the main product item by closing the riveting operation integrated in the manufacturing process. The finalized component will be used for assembling the newest model power switch in production of this corporation. In this diploma work some possible variants will be provided. The workable solution of the best one will be suggested as a final mechanical problem resolution with detailed description of construction description, component selection and skeleton program design to build a special purpose machinery.

Abstract: This paper presents the developing of a low-cost eye-tracking system by modifying the commercial-over-the-shelf camera to integrate with the proper-tuned open source drivers and the user-defined application programs. The system configuration is proposed and the gaze-tracking approximated by the least square polynomial mapping is described. Comparisons between other low-cost systems as well as commercial system are provided. Our system obtained the highest image capturing rate of 180 frames per second, and the ISO 9241-Part 9 test performance favored our system, in terms of Response time and Correct response rate. Currently, we are developing gaze-tracking accuracy application. The real time gaze-tracking and the Head Movement Estimation are the issues in future work.

Abstract: The blocking effect of reactive dye combinations during the exhaust dyeing of cotton was studied using C.I. Reactive Yellow 176, C.I. Reactive Red 239 and C.I. Reactive Black 5. In the exhaust dyeing of binary reactive dye combinations, reverse order of dyeing was carried out at the dye concentration of 1%owf. After the shade of dyed cottons were evaluated, we found that the combination of C.I. Reactive Yellow 176 and C.I. Reactive Black 5 exhibited a blocking effect. The blocking took place readily in the dyebath. Therefore, C.I. Reactive Blue 250 was used to replace C.I. Reactive Black 5 because of the similarity of their chromophores and reactive groups. The results showed less blocking effect, indicating low interaction between the dyes in the combination.

Abstract: This article is focused on computational modeling of an interaction of malleable lumbar spine fixation device with ambient bone tissue focusing on solving problems of clinical practise. It describes creation of computational model including model of geometry, materials, loads and constraints. There is a comparative stress strain analysis of spinal segment after fixation device application with its physiological state. Computations are performed with use of FEM method. To simulate natural way of loading we used the compression of motional spinal segment. Results show the difference between the system including intervertebral disc in between vertebras and the system with applied lumbar spinal fixation device.

Abstract: A series of blue crosslinking dyes EDCD, DTCD, TPCD, PVAmCD and PAAmCD were synthesized by the reaction of 1,4-dihydroxyanthraquinone with ethylenediamine, diethylenetriamine, tetraethylethylenediamine, polyvinylamine and polyallyl amine. These crosslinking dyes can be classified into two kinds, i.e. small crosslinking dyes and polymeric crosslinking dyes. These dyes were crosslinked to cotton via covalent bond by a new crosslinker NSC prepared from 4,5-diamino-2,7-naphthalenedisulphonate and cyanuric chloride. The effects of crosslinking dyeing conditions, such as NSC concentration, curing temperature and pH of crosslinking bath on the dye fixation were investigated in detail. At optimum conditions, the fixations of EDCD, DTCD, TPCD, PVAmCD and PAAmCD using NSC as a crosslinker on cotton were 91.2%, 95.6%, 99.1%, 99.4% and 99.2%, respectively. The wrinkle recovery of crosslinking dyeing was also studied. These results indicated that the polymeric crosslinking dyes showed better performance than the small ones.

Abstract: The study herein investigated the bond strength of original veneer, dyeing veneer and fixative veneer in terms of moisture content. The test results were shown that: bond strength of untreated veneer, dyeing veneer and fixation veneer were all decreased with moisture content increasing. Furthermore, wet strength of these three kind of veneers were lower than the dry strength themselves evidently. The study also found that dry strength and wet strength of original veneer were all bigger than those of dyeing veneer and fixative veneer evidently.

Abstract: Review of current Anterior Cruciate Ligament (ACL) anchor technologies indicates that many devices facilitate osteointegration but not soft tissue in-growth. The design and preliminary testing of a novel biomimetic in-situ dilating bioabsorbable ACL anchor for simultaneous soft and hard tissue attachment is the subject of this study. The anchor method for this concept has been developed to mimic the mechanical-key configuration observed in a hair root. Reviewed anchor devices are typically interference screw-based. Screw anchors can lead to unnecessary ligament pre-stress, tearing during deployment and poor graft-bone contact. This work demonstrates a new fixation concept specifically developed for use with devices consisting of temperature-sensitive glass-reinforced-glass (GRG) soft tissue conductive biomaterial. Ligament anchorage is accomplished by dilation of the device into the base of a hair-root shaped osteotomy where a ligament with a collar and self tightening knot is inserted beforehand. This method facilitates full ligament-to-bone contact at the osteotomy zone where critical physiological ligament anchorage develops. Ligament pull-out loads equivalent to published results for conventional anchors were achieved using graft analogue. Testing with porcine ligaments resulted in a substantial reduction in ligament pull-out loads. Tibia bone sample constraints combined with the unraveling of the ligament knot were identified as primary factors for low pull-out loads for the porcine ligament tests. Subsequent design iterations will employ a reduction in prototype dimensions in addition to the use of a suture to lock the ligament knot. The hair-root shaped osteotomy and ligament anchor knot elements of this approach may be translated to other fixation systems and methods. By improving macro-mechanical-key interaction between the anchor, bone and ligament, further increase in pull-out forces may be achieved without unnecessary ligament pre-stress and tear damage caused by conventional interference screw threads.