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Bolin, Tobias. „Device fingerprinting: Conformance test av HTML5“. Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-11024.
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Liang, Liu. „Test Immersion in DomeTheater using Tracking device“. Thesis, Linköpings universitet, Medie- och Informationsteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69280.
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Head tracking is an important way to interact with virtual objects in virtual world. The viewercan move or rotate his head to observe the 3D scene in dierent view. Normally head tracking isused in a cave or just on a at screen.Dome theater has a half sphere screen with multiple projectors together for showing the wholescene onto the big screen. The dome screen could give the viewer a very strong immersion feelingwhen head tracking inside dome theater and that is why we want to implement head tracking indome theater. The half sphere dome screen is so big that multiple projectors should be used forshooting the whole scene onto the big screen. Hence a cluster system is used for manipulating allthe projectors working smoothly. The display system of dome theater has no place for the headtracking part.This thesis tries to introduce a method to do head tracking in dome theater. The mainproblem is how to add head tracking in the display system in dome theater. Frame buer object(FBO) is used as the solution for this problem. The viewer's viewing frustum is created in framebuer object in order to render the 3D scene depending on the viewer's head position. The FBOtexture will then be attached onto a 3D sphere which simulates the dome sphere in virtual world.Since the viewing frustum is always created depending on the viewer's head position, the FBOtextures on the 3D sphere always can represent the 3D scene rendered depending on the viewer'shead position. Using the projectors to shoot the 3D scenes which is the 3D sphere attached by theFBO textures onto the dome screen. That is the main part of how to implement head tracking indome theater.This thesis forcus on rendering the 3D scene onto the dome screen depending on the viewer'shead position. The tracking device controlling part is out of this thesis's scope. VR Juggler (VRJ) is used as the framework in this project. Viewer's position setting and cluster setting are allsetted in the conguration file.
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Wang, Xian. „Enabling low cost test and tuning of difficult-to-measure device specifications: application to DC-DC converters and high speed devices“. Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53521.
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Low-cost test and tuning methods for difficult-to-measure specifications are presented in this research from the following perspectives: 1)"Safe" test and self-tuning for power converters: To avoid the risk of device under test (DUT) damage during conventional load/line regulation measurement on power converter, a "safe" alternate test structure is developed where the power converter (boost/buck converter) is placed in a different mode of operation during alternative test (light switching load) as opposed to standard test (heavy switching load) to prevent damage to the DUT during manufacturing test. Based on the alternative test structure, self-tuning methods for both boost and buck converters are also developed in this thesis. In addition, to make these test structures suitable for on-chip built-in self-test (BIST) application, a special sensing circuit has been designed and implemented. Stability analysis filters and appropriate models are also implemented to predict the DUT’s electrical stability condition during test and to further predict the values of tuning knobs needed for the tuning process. 2) High bandwidth RF signal generation: Up-convertion has been widely used in high frequency RF signal generation but mixer nonlinearity results in signal distortion that is difficult to eliminate with such methods. To address this problem, a framework for low-cost high-fidelity wideband RF signal generation is developed in this thesis. Depending on the band-limited target waveform, the input data for two interleaved DACs (digital-to-analog converters) system is optimized by a matrix-model-based algorithm in such a way that it minimizes the distortion between one of its image replicas in the frequency domain and the target RF waveform within a specified signal bandwidth. The approach is used to demonstrate how interferers with specified frequency characteristics can be synthesized at low cost for interference testing of RF communications systems. The frameworks presented in this thesis have a significant impact in enabling low-cost test and tuning of difficult-to-measure device specifications for power converter and high-speed devices.
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Celikadam, Turgut. „Design And Development Of An Internet Telephony Test Device“. Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1223148/index.pdf.
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The issues involved in Internet telephony (Voice over Internet Protocol (VoIP)
device) can be best understood by actually implementing a VoIP device and
studying its performance. In this regard, an Internet telephony device, providing full
duplex voice communication over internet, and a user interface program have been
developed. In the process, a number of implementation issues came into focus,
which we have touched upon in this thesis.
Transport layer network protocols are discussed in the concept of real time
streaming applications and Real Time Protocol (RTP) is modified to use as transport
layer protocol in developed VoIP device. Adaptive playout buffering algorithms are
studied and compared with each other by trace driven simulation experiments with objective measures. A method to solve clock synchronization problem in streaming
internet applications is presented.
One way and round trip delay measurement functionalities are added to the VoIP
device, so that device can be used to investigate the network characteristics.
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Potoshna, Lisa. „Design and Development of a Tracheostomy Tube Test Device“. Thesis, KTH, Skolan för teknik och hälsa (STH), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-190478.
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In the NRC (National Respiratory Centre) department at Danderyds Hospital different standard tracheostomy tubes are customized in order to create a more appropriate fit for the individual patient. This master thesis aims to design a theoretical model and build a first prototype of a tracheostomy tube test device that can be used to analyse and compare the physiological performance of different for tracheostomy tubes. The theoretical model of the device consisted of an artificial lung, artificial trachea and a ventilator, pressure and flow sensors and a data acquisition device. The first prototype was built using equipment available at the NRC department and three experimental set-ups were assembled: one simulating normal breathing and two set-ups simulating coughing. Two artificial tracheas, a small and a large one together with different tracheostomy tubes were used to evaluate the first prototype. Results showed that the first prototype could be used to compare cuffed fenestrated and non-fenestrated tracheostomy tubes. However, the first prototype was less effective when comparing uncuffed fenestrated and non-fenestrated tracheostomy tubes, which is due to the lack of airway resistance in uncuffed tubes. Results strongly motivate a further development of the device with equipment described in the theoretical model and the future studies should be focused on improving the device.
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Andar, Abhay U. „Development of a microfluidic device to test nanoparticle toxicity“. Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/2410/.
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Recent years have seen a growth in the manufacturing of nanoparticles for their uses in various fields of science and technology. However, this explosion in the production and use of nanoparticles has in turn resulted in growing concerns regarding their impact on public health and the environment (Hoet, 2004). One major route of entry into the human body is through the air-blood barrier in the lungs. The air-blood barrier at the alveolar region in most mammals is normally about 500-600 nm in thickness (Bartels, 1979) and is mainly responsible for the selective transport of gases and certain vital solutes across the membrane (Theodore, 1975). This selective transport across these barriers is regulated by tight junction protein complexes that bind two adjacent cells in the tissue. This particular selective transport mechanism is highly attractive for the drugs industry due to which the lung epithelial barriers could provide a novel mode for delivery to patients (such a system already exist for patients suffering from asthama, where they use an inhaler to deliver their dosage). However, to develop such drug delivery systems it is necessary to study the effects either through in vivo and/or in vitro research methods. For the purpose of this thesis an in vitro system using the Calu-3 cell line (cultured on two types of membrane systems) was used in the attempt at mimicing certain barrier properties (mainly transport of solutes across the membrane and integrity/tightness of the cell monolayers) present in the in vivo state. Calu-3 cells were maintained on two different sets of porous membrane types, one was the commercially available Transwell® membranes (Costar/Fisher) and the other was the self-fabricated (at CSEM, Switzerland) silicon nitride membranes. The silicon nitride membranes were particularly unique, in the sense that their thickness was only 500nm (compared to the polymer Transwell® membranes) and also presented the possibility of miniaturising the Calu-3 in vitro system. Miniaturisation helps reduce the use of test solutions and allow the development of high throughput screening devices for biological applications (Beebe, 2002). When the possibility of miniaturisation occurs along side a biological application it is often the case that microflows would be necessary for maintaining cell culture within small areas inside the devices. Therefore, microfluidics was vital in providing the opportunity for miniaturised cell based systems. In this study PDMS (Polydimethyl siloxane) based microfluidic devices were used for developing the cell culture and concentration gradient devices. The final purpose of this poject was to create a scaleable modular integrated device allowing the analysis of the induced effects on Calu-3 cells against nanoparticle/solute translocation and assessing cell monolayer integrity using a real time TEER measurement system. This miniaturised in vitro multilayered microfluidic setup consisted of three main components, a top layer micro channel (fabricated in PDMS), the middle silicon wafer bearing the silicon nitride membrane (also bearing the electrodes for measuring TEER of the cultured cell monolayer) and the bottom layer micro channel. This modular device would help assess Calu-3 cell monolayers resposes to toxic solutions and hopefully assist towards developing a novel analysis system device to study the effects of such toxic solutions in real time.
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Fält, Gustav. „Shear strenght test device : Design of a device for testing shear strenght on winter roads“. Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-78394.
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When buying a new car today customers expect that the safety systems built in the car and its tireswill do its job in every condition. This is especially important when driving on winter roads due to thedecrease in friction between the tire and the road surface. To get further understanding how snowbehaves on winter roads, knowing how the shear strength in the hard-packed snow found on winterroads changes when doing for example multiple brake test in the same tracks can be of greatimportance when designing a new, safer product. This thesis will go through the design process of anew device designed to measure shear strength in winter test tracks. The device consists of anelectric motor powered by 12 or 24 Vdc connected to a worm gear style gearbox and can measureup to 200 Nm of torque
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Jedeskog, Ulrika. „Reliabilitetstest av kraftmätare ISOP - ISOmetric Power device“. Thesis, Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-3368.
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Sammanfattning Syfte och frågeställningar Syftet med studien var att i ett test-retest utvärdera tillförlitligheten i den nyutvecklade kraftmätaren ISOP vad gäller isometrisk muskelkraft i handledens tre rörelseplan. Den frågeställning som låg till grund för studien var följande: Föreligger det någon signifikant skillnad i uppmätta värden vid upprepade mätningar av handledskraft vid två separata testtillfällen (s.k. “test-retest”)? Metod Ett test-retest utfördes på 20 stycken testpersoner (tio kvinnor/tio män, ålder 28-48 år, medelvärde 38,6 år), utan tidigare hand- eller handledsskada. Åtta mätningar utfördes i sex olika handledsriktningar: flexion, extension, radialdeviation, ulnardeviation, pronation och supination av dominant hand samt flexion och extension av icke-dominant hand. Varje mätning bestod av tre stycken tryck med maximal kraft i följd, samt i varje rörelseriktning, och resultatet beräknades som ett medelvärde av dessa (test 1). Testprotokollet upprepades identiskt efter en vecka (test 2). Som intern kontroll användes Jamar handdynamometer, vilken är sedan tidigare reliabilitetstestad. Resultat Sambandet mellan test 1 och test 2 analyserades med Pearson’s korrelations koefficient (r) samt Intraclass Correlation Coefficient (ICC) med ett p-värde satt till 0,001. Resultatet av Pearson r visade ett mycket starkt samband för 9 av 10 par med värden mellan 0,84-0,98, och ett starkt samband för det tionde paret med ett värde på 0,77. Sambandet stärks ytterligare av att ICC ligger mellan 0,88-0,99 för samtliga par. Ett beroende student’s t-test utfördes för att påvisa eventuella skillnader mellan testerna men inga signifikanta skillnader hittades och detta stärker sambandet mellan testerna. Signifikanta skillnader om p är mindre än 0,05. Slutsats Den nyutvecklade kraftmätaren ISOP uppvisar god reliabilitet med mycket starka – starka samband vad gäller test-retest. Inga signifikanta skillnader mellan mätningarna kunde påvisas. ISOP kan således anses vara tillförlitligt för bruk vid rehabilitering och utvärdering av handledsfunktion.Abstract Aim and hypothesis The aim of this study was to evaluate the reliability of ISOP – a new isometric power device with regard to evaluating isometric muscle force in the three planes of wrist motion. The hypothesis was as follows: Is there a significant difference in isometric power when repeated measurements are conducted at two different time-intervals (so called ”test-retest”)? Method A test-retest protocol was performed in 20 volunteers (ten women/ten men, age range 28-48 years, average 38.6), with no prior hand or wrist injury. Eight measurements were done in six different directions of the wrist: flexion, extension, radial deviation, ulnar deviation, pronation and supination of the dominant hand, as well as flexion and extension of the non-dominant hand. Each measurement consisted of three sequential maneuvers using maximum force, and the results were calculated as an average of these (test 1). The exact same protocol was repeated after a week (test 2). As an internal control, the Jamar hand dynamometer was used as it has previously been proven reliable. Results The relationship between test 1 and test 2 were analyzed using Pearson’s correlation coefficient (r) and Intraclass Correlation Coefficient (ICC) with a p-value set at 0.001. The result of Pearson’s r showed a very strong correlation between 9 of 10 pairs tested, with values between 0.84-0.98, and a strong correlation for the tenth pair with a value of 0.77. The strength of the correlations were confirmed by the ICC which showed 0.88-0.99 for all pairs. A dependent t-test was additionally performed to test for possible deviations between the tests, but no significant differences were found (p>0.05) which strengthens the relationship between the tests. Conclusion The new isometric power device, ISOP, has a very strong to strong correlation in a test-retest situation. No significant differences between the measurements could be demonstrated. ISOP may thus be considered a reliable device for use in wrist rehabilitation and evaluation.
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Krol, Przemyslaw Michal. „Productization and instrumented testing of a corrosion fatigue test device“. Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111748.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.Cataloged from PDF version of thesis.
Includes bibliographical references (page 79).
Corrosion Fatigue has been identified as the limiting factor of submarine propulsion shaft operation intervals. Increasing the inspection interval from 6 to 12 years could save a significant amount of money on procurement and maintenance costs. Corrosion fatigue data is sparse and incomplete and an initial prototype of a fatigue testing device that more accurately reflects the operational loading of sub shafts was designed in a previous thesis. The U.S. Navy has identified the device as improvement on current testing methods. The primary purpose of the fatigue testing machine has been identified within a long-term testing plan for the Navy. In this work, the key aspects of the design have been updated. The manufacturing, setup, operation, and maintenance of the device have been provided. Instrumentation has been as part of an effort to monitor motor health and to explore the possibility of detecting crack initiation within the test shaft. The test device has been used to collect relevant data provide baseline data on artificially pitted samples and unpitted samples test shafts in seawater for the Navy. Artificial seawater was used for testing consistency. A continued testing regime is recommended and outlined. Last, further design updates and ideas are suggested.
by Przemyslaw Michal Krol.
S.M.
10
Mays, Patricia Faye. „Seal strength models for medical device trays“. [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2756.
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Russell, Andrew James Reksten. „Design of a Mine Roof Strata Analyis Device“. Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/73210.
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Because the roof lithology in an underground coal mine is typically variable and poorly known, the safety and efficiency of these mines is reduced. To address this shortcoming, a device for analyzing rock properties by way of scratching a mine roof borehole was designed and tested in multiple different media with the goal of determining in situ mine roof properties with a nondestructive technique. Tools were developed for measuring extraction force and position of the scratching mechanism and those values were compared versus time for multiple tests to look for changes in applied force over changing positions. Because of signal stability and inconsistencies in scratch depths the data were found to contain too much variation to determine any rock properties or changing rock conditions from the simulated roof material in the concrete block. However, further scratch tests in a sandstone block indicated that increasing the diameter of the wire scratchers (and therefore increasing their stiffness and accompanying normal force) from 0.045 inches to 0.055 inches increased the average pull force from 6.24 to 9.96 lbs. Similar to that test, a scratch test was performed in a PVC pipe where it was found that increasing the scratcher diameter from 0.045 inches to 0.051 inches increased the pull force from a 2.81 lb average to a 36.46 lb average, with considerably better gouging of the host material.Master of Science
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Burkhardt, Bettina M. „Development and design of a test device for cartilage wear studies“. Thesis, This resource online, 1988. http://scholar.lib.vt.edu/theses/available/etd-11072008-063443/.
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Barnett, Shane. „Development of a Tow Capacity Test Device for Small Unmanned Vehicles“. Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/30968.
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Unmanned ground vehicles (UGVs) will increasingly be used for tasks such as retrieving injured soldiers from a battlefield, transporting supplies, and towing other small vehicles and payloads. To date, the unmanned test community has not standardized on an apparatus or test operating procedure (TOP) specifically for evaluating the towing capacity of small unmanned ground vehicles. Draw-bar testing has been adapted by several groups to quantify small unmanned ground vehicle (SUGV) tow capacity; however, these devices are inherently limited to measuring peak static towing force. This paper describes an alternative method using a variable-resistance tow sled for quantifying the dynamic towing capacity of SUGVs. The tow sled contains a frontal skid plate and a rear axle and wheel arrangement. A weighted carriage is transferred from the rear of the sled to the front of the sled by a cable geared to the rear axle. As the sled is pulled along the ground, towing resistance increases in a controlled linear fashion. An encoder on the rear axle and a load cell in the tow chain provide motion and force data. Testing of the tow sled has been conducted on a TALON SUGV at the Southwest Research Institute (SwRI) Small Robot Test Facility and a MATILDA SUGV at the Joint Unmanned Systems Test, Experimentation, and Research (JOUSTER) site.Master of Science
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Ita, Meagan Eleanor. „Comparison of Q3s Anthropomorphic Test Device Biomechanical Responses to Pediatric Volunteers“. The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397486884.
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Li, Hua. „Qualitative Blood Coagulation Test Using Paper-Based Microfluidic Lateral Flow Device“. University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406810864.
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Chandler, Dawn, John Dachos, Barbara DeBary-Kesner, Jimmy Howard und Sherry Springs. „Localized Electromagnetic Directed Disrupter Device (LED3) Test and Evaluation Plan for Option 2A“. Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/7087.
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Provides border security with a non-lethal materiel solution to holistically protect the refugees, DHS personnel, and U.S. citizens from crime or personnel threat elements'_ Enables border security to non-lethally stop vehicles in motion, allowing safe interdiction's Establishes a ground mounted, self-protecting materiel solution capable of being controlled and monitored remotely while non-lethal to humans and animals
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MacGregor, Marjorie J. „Field test of the Coyote Lure Operative Device for delivery of oral contraceptives“. Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1663116531&sid=2&Fmt=2&clientId=18949&RQT=309&VName=PQD.
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Risberg, Christoffer, und Hampus Lynghed. „Verifieringsplattform i SystemVerilog“. Thesis, Linköpings universitet, Elektroniksystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-71606.
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Our task was to create a virtual test bench for verifying memory addresses in our commissioning body’s models. The purpose with the testbench was that it should be created in such a way that it would be easy to change the device under test without any major changes in the testbench. To solve the problem that the testbench had to be able to verify different devices we had to create a general enviroment for how the testbench had to be composed. By doing an analysis of which com-ponents that are usually included in a testbench and which components that were necessary in our project we came up with a generall enviroment for the testbench. Our result was a testbench with the follwing basic functions: * Read from a file that contains read and write operations to the Device Under Test (DUT).* Apply the stimulus to the device* Read the results from the device* Compare the results with wanted values* Generate a log file which contains information about the simulation result.
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Alzatari, Mazen [Verfasser], und Holger [Akademischer Betreuer] Hirsch. „Power Electronic Control Device for High Voltage Test Transformers / Mazen Alzatari. Betreuer: Holger Hirsch“. Duisburg, 2016. http://d-nb.info/1081302992/34.
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Broman, Adam, und Gustav Blom. „Assessment of function of a 3D-printed body-powered upper limb prosthetic device“. Thesis, Hälsohögskolan, Högskolan i Jönköping, HHJ, Avd. för rehabilitering, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-44578.
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Purpose Conventional arm-prosthesis are expensive to make and therefore limit the availability for users on the geographical locations there the user pays for it. This study compares the hand function of a 3D-printed prosthesis with lower production cost with a traditional prosthesis. Method A test person performed two different tests of hand function (Box and Block test and Nine-hole peg test) with a myoelectric trans radial prosthetic arm and a body powered 3D printed trans radial prosthetic arm. The test person also answered two parts of the orthotics and prosthetics users’ survey (OPUS) considering both prosthetic arms. Result The 3D-printed prosthesis performed worse than the traditional prosthesis in the two tests of hand function and generally worse in the questionnaire about the function of the prosthesis. Though it got higher values in comfort and affordability. Conclusion There was a significant difference in function between the 3D-printed prosthesis and the myoelectric prosthesis but the printed prosthesis could perform many activities in daily living. Whether the 3D-printed prosthetic device is priceworthy or not is hard to measure because of different criteria, therefore a conclusion is hard to reach.
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Smith, Sylvia. „The Comparability of a Field & a Device-Mediated Performance Test for M1 Armor Crewmen“. TopSCHOLAR®, 1990. https://digitalcommons.wku.edu/theses/2862.
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A study was conducted to evaluate the construct validity of four measures of Armor combat performance derived through the Simulation Networking (SIMNET) system. Problems with field testing, such as high cost, low reliability, and lack of realism, has lead the Army to look for alternative methods for soldier evaluation. SIMNET's utility for supplemental training and hardware development has been documented and the device holds promise as a low-cost alternative for soldier evaluation. Performance by 120 M1 tank crews on a SIMNET test was compared to their performance on a field test measuring four critical domains of Armor combat performance: command and control (C2), communications, position location, and combat driving. Acceptable levels of internal consistency were found for the C2 and communications dimensions. Some evidence of convergent and discriminant validity were found for these two dimensions through the multitrait-multimethod matrix and analysis of variance procedures. However, more score variance was attributable to undesirable sources (method bias and error) than to desirable sources (convergent and discriminant validity). Comparing performance on a set of direct-analogue items from the two tests failed to produce greater evidence of convergent and discriminant validity. Soldiers reported performing tasks on SIMNET to be "mostly the same" as performing tasks on the Ml tank. The rank order of soldier's questionnaire responses on the four performance dimensions reflected the rank order of the four correlations of performance on the two tests. The results of this study do not support the construct validity of SIMNET as a performance testing device of critical combat skills. Future research on SIMNET's construct validity should use a SIMNET test and field test with the exact same items and scenarios surrounding the performance of those items. If SIMNET's construct valid:ty still is not supported, better criterion measures should be sought against which SIMNET can be evaluated.
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Infante, Sedano Julio Angel. „A modified ring shear test device for determining the hydro-mechanical behaviour of unsaturated soils“. Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/29352.
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This thesis presents the design details of an automated modified ring shear apparatus for the testing of unsaturated soils using the axis translation technique. The system is fully automated and it can be used for conducting Constant Load and constant Suction (CLS) shear tests, Constant Volume and constant Suction (CVS) shear tests, Constant Load and constant Water content (CLW) shear tests as well as Constant Volume and constant Water content (CVW) shear tests. In addition to shear tests, the soil-water retention curve (SWRC) can also be generated for the same specimen in the same testing device. The principal advantages of the device include its ability to shear unsaturated soils to very large deformations as well as conducting tests under constant volume conditions. Analysis of the experimental data using these characteristics suggests that the volumetric changes of the sheared specimen are not the only factor affecting the changes of its water content under constant matric suction conditions. In addition, the experimental evidence suggests that shear deformations much greater than those typically used in the testing of unsaturated soils are required if an ultimate water content equilibrium condition is to be reached. Such an equilibrium condition is required if critical state data is to be determined for unsaturated soils.
The thesis also presents the design and use of additional equipment utilised for testing unsaturated soils. This includes the use of an electronic balance to measure the change in water volume of the specimen, and provides details on how the readings of the balance can be stabilized to remove the noise caused by the connection of the tubes to the overflow jar. A simple technique relying solely on the measurement of the water volume change to determine the volume of diffused air removed by the flushing operations is also presented. The other pieces of equipment described include a volume gauge/air trap that can be used to measure the water volume changes of unsaturated soil specimens, and a simple, robust, and precise pressure gauge.
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Falls, Candice. „FRAILTY IN PATIENTS UNDERGOING LEFT VENTRICULAR ASSIST DEVICE IMPLANTATION“. UKnowledge, 2019. https://uknowledge.uky.edu/nursing_etds/47.
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Heart failure is a progressive condition that affects over 5.7 million Americans and costs associated with heart failure account for 2-3 % of the national health care budget. The high rates of morbidity and mortality along with increased costs from readmissions associated with advanced heart failure have led to the exploration of advanced treatments such as left ventricular assist devices (LVADs). LVADS have demonstrated morbidity and mortality benefit but cost remains extensive with costs per quality-adjusted years > $400,000. With this in mind, it is important to identify those who are most likely to benefit from an LVAD to avoid unfavorable outcomes and cost. Although general guidelines and criteria for patient eligibility have been established, choosing patients for LVAD implantation remains challenging. A new focus on patient selection involves the presence of frailty. While frailty has been studied in the elderly population and in patients undergoing cardiac surgery, frailty in patients undergoing left ventricular assist device (LVAD) remains controversial. The purpose of this dissertation was to examine measures of frailty in patients undergoing LVAD implantation. The specific aims of this dissertation were to: (1) identify a feasible frailty measure in adults with end-stage heart failure who underwent LVAD implantation by testing the hypothesis that frailty would predict 30 day rehospitalization rates using Fried’s criteria, Short Physical Performance Battery test, handgrip strength, serum albumin and six minute walk test (2) Determine whether frailty measures improve 3 months post LVAD implantation (3) compare sensitivity of these three measures to change in frailty.
Surgical approaches, including heart transplantation and LVAD implantation, for patients with end-stage heart failure was discussed in this dissertation. Data from two subsets of participants who underwent LVADS at the University of Kentucky between 2014 and 2017 were included in the analysis for this dissertation. In the first study, we found that none of the measures are good predictors of frailty in patients with advanced heart failure who undergo LVAD implantation. Handgrip was the only marker of frailty that predicted 30 day readmission but the relationship was a negative association. In the second study, six-minute walk and low serum albumin levels reflect short-term improvement in frailty. These simple measures may be used to determine those patients who are responsive to LVAD implantation.
The findings of these studies filled some gaps in our understanding of markers of frailty in patients undergoing LVADs. We gained a better understanding of which markers of frailty are likely to improve in most people after LVAD implantation and thus frailty should not preclude candidate selection for an LVAD. Subsequently, more research is needed to investigate these markers and outcomes.
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Liang, Chao-Wen. „Phase Shifting Grating-Slit Test Utilizing A Digital Micromirror Device With an Optical Surface Reconstruction Algorithm“. Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/193833.
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A novel optical surface testing method termed the grating-slit test is demonstrated to provide quantitative measurements and a large dynamic measurement range. Although it uses a grating and a slit, as in the traditional Ronchi test, the grating-slit test is different in that the grating is used as the object and the slit is located at the observation plane. This is an arrangement that appears not to have been previously discussed in the optical testing literature. The grating-slit test produces fringes in accordance with the transverse ray aberrations of an aberrated wavefront. By using a spatial light modulator as the incoherent sinusoidal intensity grating it is possible to modulate the grating and produce phase shifting to make a quantitative measurement. The method becomes feasible given the superior intensity grayscale ability and highly incoherent illumination of the spatial light modulator used. Since the grating is used as the object, there are no significant diffraction effects that usually limit the Ronchi test. A geometrical and a detailed physical analysis of the grating-slit test are presented that agree in the appropriate limit. In order to convert the measured transverse ray aberrations to the surface figure error, a surface slope sensitivity method is developed. This method uses a perturbation algorithm to reconstruct the surface figure error from the measured transverse ray aberration function by exact ray tracing. The algorithm takes into account the pupil distortion and maps the transverse ray aberration from the coordinate system of the observation plane to the coordinate system of the surface under test. A numerical simulation proves the validity of the algorithm. To demonstrate the dynamic range of the grating-slit testing method, two optical surfaces are measured. The first surface is a polished spherical mirror with 0.6 waves of aberration as measured with an interferometer. Using the concept of transverse ray aberration separation, the first surface is measured without a strict alignment requirement. The second surface is a concave ground optical surface with 275 waves of astigmatism. The measurements from the grating-slit test yield useable surface figure information that is in agreement with the results from other testing methods.
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LaViolette, Richard J. „Knowledge engineering considerations for improving information sharing in the joint improvised explosive device defeat test board“. Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5718.
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Approved for public release; distribution is unlimited.Improvised Explosive Devices (IEDs) will continue to evolve as the enemy's weapon of choice. Dynamic and responsive enemies alter IEDs in reaction to our Counter-IED efforts, which results in the need for continuous accelerated testing and acquisition of Counter-IED tools. Over the last five years, an accelerated acquisition process enabled the expansion of testing entities and ranges beyond the purview of the Joint Improvised Explosive Device Defeat Test Board (JTB) established to monitor them. As a result, information sharing between JTB organizations is not efficient, which leads to less capable and slowly fielded equipment. This research reports on the use of a cognitive task analysis and contextual inquiry focused on identifying and mitigating information sharing impediments. The objective is to provide recommendations to improve information sharing between personnel involved with the JTB. Results indicate that the most common information sharing barriers relate to organizational culture, which leads to the recommendation of creating a JTB position specifically focused on information flow inside and outside of the organization. Results regarding information sharing enablers indicated that enhancing test range cooperation and improving information systems through more tester level meetings, use of the customized affinity diagram, and implementing user recommendations would improve information sharing.
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Ura, Hernandez Daniel. „Development of a test device to measure the tribological behaviour of shoe-surface interactions in tennis“. Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/16882/.
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The aim of this thesis was to better understand the tribological mechanisms that occur during typical player movements, build further on this understanding and develop a robust, portable device to assess the friction characteristics of tennis surfaces that relate to playing performance and safety. To understand the tennis player’s response and adaptability to a tennis court surface, including friction in the shoe-surface interface, a series of friction experiments were carried out on three categories of tennis surface, grass, clay and hardcourt. For grass, parameters such as moisture, level of wear and height were found to have an effect on the shoe-surface friction. For clay, influence of clay particle size and the infill volume was established. In terms of biomechanical conditions, it was found that the shoe orientation during a slide affects the friction. It was demonstrated that matching applied pressures is a useful approach for shoe friction testing and analysis. Through video analysis, shoe landing and sliding were found to be two possible ‘risk’ movements. Material characterisation, combined with friction and temperature measurements have provided empirical knowledge into the manner in which shoes and surfaces behave. During a slide on hardcourts, temperature changes were found to be different along a shoe outsole. The front part experienced higher change of temperature compared to other positions. Three types of bespoke tread samples were produced and tested, resulting a ‘holed sample’ the optimal to use. These samples resulted relatively easy to manufacture and generate frictional results compared to tennis shoes. The final robust portable device resulting from this study, measures the friction characteristics of the shoe-surface interface representative of match-play tennis. The device can be used in two configurations to replicate a shoe landing and a sliding movement. The test shoe consists of a commercial rubber with a bespoke tread design with mechanical properties that match typical values to a tennis shoe. This device will aid the International Tennis Federation (ITF) and the sports surface research community to gain understanding of player-shoe-surface frictional interactions, and allow courts to be monitored around the world.
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Nassar, Saif. „Evaluation of the Ohio CTE Device for Low Temperature Characterization of Hot Mix Asphalt“. University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1597158023589419.
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Canlas, Joel. „Creating software libraries to improve medical device testing of the Pacing System Analyzer (PSA) at St. Jude Medical“. DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/599.
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Software testing, specifically in the medical device field, has become increasingly complex over the last decade. Technological enhancements to simulate clinical scenarios and advancements in communicating to medical devices have created the need for better testing strategies and methodologies. Typical medical device companies have depended on manual testing processes to fulfill Food and Drug Administration (FDA) submission requirements specifically Class III devices which are life supporting, life sustaining devices. At St. Jude Medical, software testing of Class III devices such as implantable cardioverter-defibrillators (ICDs), pacemakers, and pacing analyzers are given top priority to ensure the highest quality in each product. High emphasis is made on improving software testing for ease of use and for catching more software errors in each device. A significant stride in testing has automated the process and has provided software verification teams with the tools they need to successfully test and deliver high quality products. By creating software libraries which interact with communication to the other interfaces needed to test medical devices, test engineers can focus on fully testing device requirements and will not be concerned with how each test will interact with the device or any other testing tools. The main focus will be a specific St. Jude Medical device known as the Pacing System Analyzer (PSA). The PSA device will be used to demonstrate how verification engineers are able to benefit from software libraries and allow the testing process and test development to be fully automated. New technologies and standards will be created to simulate clinical scenarios and to communicate to new devices. The goal is to use software engineering principles to create standard test libraries which sustain these changes while still allowing testers to focus on finding issues for each device.
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Heisser, Ronald Henry. „Design, development, and characterization of an experimental device to test torsion-controlled fracture of thin brittle rods“. Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105705.
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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.Cataloged from PDF version of thesis.
Includes bibliographical references (page 40).
As research continues to uncover the many different physical properties of meso- and microscale materials, it becomes more evident that these materials often behave in counterintuitive ways. Characterizing unique phenomena not only provides analogies in nature which inspire innovation at all levels of research and design but also presents new possibilities for future technological development. The discussion presented herein explores the design and development of a low-cost, manual device intended to test a hypothesis rooted in the behavior of breaking pasta that intrigued even Richard Feynman. While the mechanism for why spaghetti breaks into three or more pieces has been described, the experimental discussion presented here focuses on the effect that added torsion has on the fracture bent spaghetti. Specifically, it is possible that twisting the spaghetti a critical angle and bending it will cause it to fracture into only one piece. The idea of torsion being used to exhibit some control over how a material fractures has not been well-investigated; the results which come from this experiment may prove useful for applications even beyond the scope of thin brittle materials. With this said, the sensitivity in quantifying breaking from torsion and bending together requires that the experimental device prevent systematic error stress from negatively impacting the accuracy of the experiment. Thus much time is devoted to explanation and rationale behind the analysis of the experimental device. Alongside the device's characterization this thesis serves to be a reflection of the design process taken while creating this device. Lessons learned from this project are included in all aspects of the discussion and a section in the Appendix is devoted to a more detailed account of the design and fabrication of one device component.
by Ronald Henry Heisser.
S.B.
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Palkovic, Steven D. (Steven David). „Development of a portable scratch test device for probing strength, ductility and structural distress in metal materials“. Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90157.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2014.Cataloged from PDF version of thesis.
Includes bibliographical references.
Practicing civil, mechanical, aerospace, petroleum and structural engineers are often faced with the complexity of evaluating the quality and integrity of new or existing structures. Recent academic research has demonstrated that instrumented scratch testing is a viable alternative for determining the strength and ductility of metals without the use of destructive methods involving the extraction of tensile testing specimens. Although the scientific basis for scratch testing is well established, there is a necessity for a simple and robust implementation that avoids the complexities of current methods which require expensive laboratory equipment and sophisticated data processing. A detailed description of the instrumented scratch testing method for characterizing ductile metals is provided, as well as comparisons with existing alternatives. An innovative scratch testing method is proposed and validated to perform a displacement controlled scratch experiment. A portable scratch testing device is designed and developed to utilize the displacement control technique along with specific instrumentation to allow for the continuous measurement of material properties along the length of a scratch during the experiment. The scratch testing device and method are implemented in a scratch experiment on a welded connection. For the first time, a simple experimental procedure allows for the measurement of changes in mechanical properties through the weld, from the base metal, heat-affected zone (HAZ) and filler weld metal. This novel application highlights the unique ability of the scratch testing method to monitor the evolution of localized mechanical properties in areas of interest to practicing engineers. Recommendations for future iterations of the portable scratch tester are provided.
by Steven D. Palkovic.
S.M.
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Olsson, Jakob. „Measuring the Technical and Process Benefits of Test Automation based on Machine Learning in an Embedded Device“. Thesis, KTH, Programvaruteknik och datorsystem, SCS, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231785.
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Learning-based testing is a testing paradigm that combines model-based testing with machine learning algorithms to automate the modeling of the SUT, test case generation, test case execution and verdict construction. A tool that implements LBT been developed at the CSC school at KTH called LBTest. LBTest utilizes machine learning algorithms with off-the-shelf equivalence- and model-checkers, and the modeling of user requirements by propositional linear temporal logic. In this study, it is be investigated whether LBT may be suitable for testing a micro bus architecture within an embedded telecommunication device. Furthermore ideas to further automate the testing process by designing a data model to automate user requirement generation are explored.Inlärningsbaserad testning är en testningsparadigm som kombinerar model-baserad testning med maskininlärningsalgoritmer för att automatisera systemmodellering, testfallsgenering, exekvering av tester och utfallsbedömning. Ett verktyg som är byggt på LBT är LBTest, utvecklat på CSC skolan på KTH. LBTest nyttjar maskininlärningsalgoritmer med färdiga ekvivalent- och model-checkers, och modellerar användarkrav med linjär temporal logik. I denna studie undersöks det om det är lämpat att använda LBT för att testa en mikrobus arkitektur inom inbyggda telekommunikationsenheter. Utöver det undersöks även hur testprocessen skulle kunna ytterligare automatiseras med hjälp av en data modell för att automatisera generering av användarkrav.
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Newquist, Cathy. „The grammatic closure subtest of the ITPA as a screening device“. PDXScholar, 1986. https://pdxscholar.library.pdx.edu/open_access_etds/3708.
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Identification and selection of a speech-language caseload in the school setting can be a challenging task. The initial stages of caseload selection are usually in the form of a screening procedure. Although speech-language information is gathered at that time, information about its relationship to each student's academic status is usually not obtained. Such information would be useful in a setting that requires the provision of special education services to be justified from a basis of academic need.
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Charonko, Cami Marie. „Evaluation of an In Situ Measurement Technique for Streambank Critical Shear Stress and Soil Erodibility“. Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/33401.
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The multiangle submerged jet test device (JTD) provides a simple in situ method of measuring streambank critical shear stress (Ï c) and soil erodibility (kd). Previous research showed streambank kd and Ï c can vary by up to four orders of magnitude at a single site; therefore, it is essential to determine if the large range is due to natural variability in soil properties or errors due to the test method. The study objectives were to evaluate the repeatability of the JTD and determine how it compares to traditional flume studies. To evaluate the repeatability, a total of 21 jet tests were conducted on two remolded soils, a clay loam and clay, compacted at uniform moisture content to a bulk density of 1.53 g/cm^3 and 1.46 g/cm^3, respectively. To determine the similarity between JTD and a traditional measurement method, JTD Ï c and kd measurements were compared with measurements determined from flume tests.
The JTD kd and Ï c ranged from 1.68-2.81 cm^3/N-s and 0.28-0.79 Pa, respectively, for the clay loam and 1.36-2.69 cm^3/N-s and 0.30-2.72 Pa, respectively, for the clay. The modest variation of kd and Ï c for the remolded soils suggests the JTD is repeatable, indicating the wide range of parameters measured in the field was a result of natural soil variability. The JTD median kd and Ï c, except clay loam kd (clay loam kd = 2.31 cm^3/N-s, Ï c = 0.45 Pa; clay kd = 2.18 cm^3/N-s, Ï c = 1.10 Pa) were significantly different than the flume values (clay loam kd = 2.43 cm^3/N-s, Ï c = 0.23 Pa; clay kd = 4.59 cm^3/N-s, Ï c = 0.16 Pa); however, considering the range of potential errors in both test methods, the findings indicate the multiangle submerged jet test provides reasonable measurement of erosion parameters in a field setting.
Master of Science
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Baker, Wade Andrew. „Development and Validation of a Finite Element Dummy Lower Limb Model for Under-body blast Applications“. Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/86657.
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An under-body blast (UBB) refers to the use of a roadside explosive device to target a vehicle and its occupants. During Operation Iraqi Freedom, improvised explosive devices (IEDs) accounted for an estimated 63% of US fatalities. Furthermore, advancements in protective equipment, combat triage, and treatment have caused an increase in IED casualties surviving with debilitating injuries. Military vehicles have been common targets of IED attacks because of the potential to inflict multiple casualties.
Anthropomorphic test devices (ATDs) are mechanical human surrogates designed to transfer loads and display kinematics similar to a human subject. ATDs have been used successfully by the automotive industry for decades to quantify human injury during an impact and assess safety measures. Currently the Hybrid III ATD is used in live-fire military vehicle assessments. However, the Hybrid III was designed for frontal impacts and demonstrated poor biofidelity in vertical loading experiments.
To assess military vehicle safety and make informed improvements to vehicle design, a novel Anthropomorphic Test Device (ATD) was developed and optimized for vertical loading. ATDs, commonly referred to as crash dummies, are designed to estimate the risk of injuries to a human during an impact. The main objective of this study was to develop and validate a Finite Element (FE) model of the ATD lower limb.Master of Science
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Eatinger, Ryan Joseph. „Built-in self-test in integrated circuits - ESD event mitigation and detection“. Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/13538.
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Master of ScienceDepartment of Electrical Engineering
William Kuhn
When enough charges accumulate on two objects, the air dielectric between them breaks down to create a phenomenon known as electrostatic discharge (ESD). ESD is of great concern in the integrated circuit industry because of the damage it can cause to ICs. The problem will only become worse as process components become smaller. The three main types of ESD experienced by an IC are the human body model (HBM), the charged device model (CDM), and the machine model (MM). HBM ESD has the highest voltage while CDM ESD has the highest bandwidth and current of the three ESD types. Integrated circuits generally include ESD protection circuitry connected to their pads. Pads are the connection between the IC and the outside world, making them the required location for circuitry designed to route ESD events away from the IC's internal circuitry. The most basic protection pads use diodes connected from I/O to VDD and I/O to ground. A voltage clamp between VDD and ground is also necessary to protect against CDM and MM event types where the device may not yet have a low impedance supply path connected. The purpose of this research is to investigate the performance of ESD circuits and to develop a method for detecting the occurrence of an ESD event in an integrated circuit by utilizing IC fuses. The combination of IC fuses and detection circuitry designed to sense a broken fuse allows the IC to perform a built-in self-test (BIST) for ESD to identify compromised ICs, preventing manufacturers from shipping damaged circuits. Simulations are used to design an optimized protection circuit to complement the proposed ESD detection circuit. Optimization of an ESD pad circuit increases the turn-on speed of its voltage clamps and decreases the series resistance of its protection diodes. These improvements minimize the stress voltage placed on internal circuitry due to an ESD event. An ESD measurement setup is established and used to verify voltage clamp operation. This research also proposes an ESD detection circuit based on IC fuses, which fail during an ESD event. A variety of IC fuses are tested using the ESD measurement setup as well as a TLP setup in order to determine the time and current needed for them to break. Suitable IC fuses have a resistance less than 5 Ω and consistently break during the first trial.
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Eid, Feras. „Design, fabrication, and characterization of a MEMS steam-generating device based on the decomposition of high-test hydrogen peroxide“. Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61596.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 147-152).
Microscale ejector pumps offer the potential for high flow rate pumping of gases, a functionality that is greatly needed in MEMS technology. These pumps have many additional characteristics, such as their simplicity of design and their lack of moving parts, which favor them over other state-of-the-art MEMS gas pumps. One of the challenges associated with driving ejector pumps, however, is providing a compact source of motive fluid. This fluid is the high-speed gas that drives the pumping action. The current thesis presents a MEMS device capable of generating steam at speeds suitable for driving an ejector pump in a compact fashion. To that end, the device utilizes the homogeneous catalytic decomposition of hydrogen peroxide. Analysis shows that a MEMS ejector pump driven by this device is capable of handling mass flow rates per unit pump volume on the order of 10-2 g/s/cm 3, which are two orders of magnitude higher than those of state-of-the art MEMS gas pumps. In addition to pumping, the steam generator may also be used for microrocket thrust generation in micropropulsion applications. In this thesis, the design, fabrication, testing, and successful demonstration of the MEMS steam generator are presented. The device consists of a mixing section for the peroxide and catalyst streams, a reactor section where the peroxide decomposes, and finally a nozzle section where the gaseous products of the decomposition are accelerated to the required velocities. To design the device, multidomain (chemical, thermal, and fluidic) numerically-implemented modeling is used to study the underlying physics and arrive at an optimized, microfabricatable design. The modeling takes into account the key challenges of thermal management, achieving fast mixing, and boundary layer compensation. The device is then fabricated from a stack of four silicon wafers and one Pyrex wafer using deep reactive ion etching and wafer bonding. The modeling also guides the design of a micabased ceramic package which provides both thermal insulation and piping ports. The system is then experimentally tested using high-test hydrogen peroxide and ferrous chloride tetrahydrate solution as the catalyst. The overall initial peroxide mass fraction is varied between 83% and 71%. The device is characterized using temperature measurements, refractive index analysis, and visual inspection during operation. Successful performance is demonstrated via the full decomposition of the peroxide and the complete vaporization of the water produced. The experimental results are also compared with those from the simulation. Good agreement is observed between experiment and theory, providing comprehensive model verification. The realization and demonstration of this steam generator promise significant enhancements in MEMS technology, particularly in the fields of gas pumping and micropropulsion.
by Feras Eid.
Ph.D.
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Howard, Brendan James. „Effects of a One-to-One iPad Initiative Program on 11th Grade Standardized Test Scores“. ScholarWorks, 2017. https://scholarworks.waldenu.edu/dissertations/3891.
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The iPad and other mobile devices have become so popular over the past few years that many school districts are purchasing these devices and implementing them in the classroom with little to no research. Because there has been no previous research at one rural school district in Michigan, the primary purpose of this quantitative causal-comparative study was to investigate the effects that a 1-to-1 iPad initiative program has had on only 11th grade student achievement and determine if 11th grade students' test scores on the Michigan Merit Exam in the areas of mathematics, science, and social studies for each school year from 2007 to 2016 have improved, declined, or stayed the same. The framework for this study was rooted in Kearsley and Shneiderman's engagement theory, which specifically applies to technology-based learning environments. A repeated measures analysis of variance was used to compare the standardized test scores from 2007 to 2016, with the scores as the dependent variables and the introduction of the iPad technology as the independent variable. Student characteristics of gender, ethnicity, and socioeconomic status were covariates. The findings from this study indicated that the iPad has improved standardized test scores at this local high school and therefore this school district should continue the promotion and investment in mobile learning devices and other technologies. The resulting policy recommendation from this study prompts the local school district to pursue the expansion of a 1-to-1 iPad program or other mobile learning device in the current curriculum to help increase student achievement on standardized tests. The incorporation of Apple's iPad in the classroom has potentially created a solution to help students increase academic performance and achieve higher levels on standardized and state tests.
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Jacobsen, Andrés Pohlenz. „Development of Steel Slit Wall Dampers with Embedded Condition Assessment Capabilities“. 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/131887.
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Neff, Max [Verfasser], und Ulrich [Akademischer Betreuer] Katz. „Studies on the Selection of Neutrino-like Signals for the Acoustic Detection Test Device AMADEUS / Max Neff. Gutachter: Ulrich Katz“. Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2013. http://d-nb.info/1054164681/34.
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Liu, Shuo. „Development and application of a physiological ventilation device test bench, capable of reproducing automatically respiratory profiles registered with ventilation polygraph“. Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS543.
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Le syndrome d’apnée obstructive du sommeil affecte 6% à 17% de la population adulte. Le traitement de référence est la ventilation nocturne par une pression positive continue (PPC) fixe ou autopilotée afin de maintenir les voies aériennes ouvertes. L’efficacité de traitement des PPC autopilotées dépend des algorithmes et technologies pour détecter et qualifier les événements respiratoiresDes bancs d’essai ont été créés pour évaluer les PPC autopilotées en conditions comparables, en simulant des scénarios respiratoires composés de chaînes répétitives d’événements respiratoires. Les profils respiratoires simulés par les bancs d’essai précédents sont standardisés et simplifiés par rapport au profil respiratoire du patient.Pour tendre vers des essais plus réalistes, un nouveau banc d’essai physiologique permettant de reproduire automatiquement les profiles respiratoires à partir des données polygraphiques a été créé pendant cette thèse. Il a été validé en évaluant la simulation de scénarios respiratoires de différents phénotypes issus de 12 patients.Via ce banc d’essai, la précision de l’index d’apnée-hypopnée (IAH) résiduel fourni par PPC a été évalué, en comparant les IAH déterminés par 4 dispositifs de PPC (AirSense 10, DreamStation Auto, S.Box et Prisma 20A) avec ceux de polygraphie. Les résultats ont permis de quantifier les différences d’IAH afin d’aider les médecin à en tenir compteObstructive sleep apnea syndrome affects 6% to 17% of adult population. The reference treatment is nocturnal ventilation via an either fixed or auto-titrating positive airway pressure (APAP) to maintain upper airway (UA) open. Treatment efficiency of APAP depends greatly on algorithms and technologies used for detecting and characterizing disordered breathing events (linked to UA obstruction or central command).Bench tests have been developed to evaluate APAP devices under the same conditions, by simulating respiratory scenarios composed of a repetitive string of several disordered breathing events registered from apneic patients or artificially designed.Therefore, breathing profiles simulated on benches are standardized and simplified, in comparison with patients’. To improve this disadvantage, a new physiological bench, which enables reproducing automatically a specific patient breathing profile from its polygraph recordings, has been created. It has been validated by simulating various breathing profiles issuing from 12 patients of different pathological phenotypes.Through this new bench, the accuracy of residual apnea hypopnea indices (AHI) determined by 4 APAP devices (AirSense 10, DreamStation Auto, S.Box and Prisma 20A) has also been investigated in comparison with polygraph scorings. The results would help physicians in clinical practice thanks to the quantification of AHI discrepancies between manufacturers
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Liu, Xi. „Semi-parametric Bayesian Inference of Accelerated Life Test Using Dirichlet Process Mixture Model“. Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1447193154.
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Hamze, Kassem. „Development of an Efficient Methodology for Modeling Parasitic Effects within a Broadband Test Circuit“. Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC232/document.
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Les travaux de cette thèse traitent de l'élaboration d'une méthodologie efficace pour la modélisation des effets parasites dans une carte en large bande de fréquence. La réduction du «Time to Market» pour la conception des produits RF et hyperfréquences nécessite le développement d'une méthode efficace de caractérisation et de modélisation pour mieux prendre en compte les erreurs incluses dans la carte de test.Les principaux résultats concernent les contributions suivantes :- Mise au point des standards de calibrage innovateur pour caractériser et modéliser les effets parasites inhérent au modèle.- Élaboration d'une nouvelle approche basée sur une technique de calibrage TRL et une méthode d’élimination efficace de ces effets.- Application aux dispositifs différentiels lors de l'utilisation du calibrage TRL dans le cas de plusieurs ports.La nouvelle approche proposée pour le calibrage et le de-embedding est appliquée à un dispositif actif qui est actuellement utilisé dans l'industrie. Les résultats de mesure d’un dispositif inclus dans une carte de test ont été comparés à des mesures calibrées à l’aide d’une carte d’évaluation comportant des standards TRL.Cette étude a été prolongée avec le calibrage TRL multi-port pour être utilisé pour la bande large des dispositifs comme les dispositifs différentielsThe work of this thesis deals with the developing of an efficient methodology for modeling parasitic effects within a broadband board. Reducing “Time to Market” for the design of RF and microwave products necessitates the development of an efficient characterization and modeling methodologies for better calibrating the errors embedded within the test board.Main results concern the following contributions:- Development of an innovative calibration standards to characterize and model the parasitic effects embedded within the model.- Elaboration of a new approach based on a TRL calibration technique and de-embedding method effective to de-embed these effects.- Application on differential devices upon using multi-port TRL calibration.The new proposed approach for calibration and de-embedding is applied to an active device which is being in use in industry nowadays. The measurement result of the device within a load board has been compared to a calibrated measurement using an evaluation board that include TRL standards.This study has been extended with multi-port TRL calibration to be used for large variety of devices like the differential ones
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Legendre, Daniel Formariz. „Estudos de técnicas de texturização e biolização, e desempenho biológico in vitro e in vivo em membrana para um dispositivo de assistência ventricular e coração artificial totalmente implantáveis“. Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/82/82131/tde-29082003-152115/.
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Foi desenvolvido um diafragma de elevada vida útil e biocompatibilidade a ser utilizado em um dispositivo de assistência ventricular esquerda(DAV) eletromecânico de dimensões reduzidas e totalmente implantável. Foi realizado teste de resistência do diafragma de poliuretana com superfície texturizada. O teste avaliou sua resistência para experimentos In Vivo de até quinze dias com o DAV implantado em bezerro. Uma superfície de endotélio natural tem excelente tromboresistência. A quantidade e as características da neointima formada em um DAV são determinadas pela superfície do material, hemodinâmica e condições físico-patológicas. O implante de patch na aorta abdominal de porco isola as variáveis que normalmente estão presentes durante a utilização do DAV e que interferem na hemocompatibilidade do material. A avaliação das características do material foi obtida com o seu implante na parede da aorta descendente em contato com o fluxo sanguíneo. Diferentes tipos de superfície de contato foram avaliadas em sete experimentos In Vivo. Este estudo está voltado para as reações de interface sangue / material. Um estudo histológico foi realizado ao final de cada experimento para analisar as interações entre o sangue e o material, quantificando e qualificando a intima neo formada sobre a superfície de contato, calcificação e deposições de elementos constituintes do sangueIt has been developed a high lifetime and biocompatible diaphragm to be used in a Left Ventricle Assist Device (LVAD) that is a reduced dimension totally implantable electromechanical device. It has been performed an endurance test on a textured diaphragm made of polyurethane. This test has evaluated the diaphragm resistance to be used in In Vivo tests with the LVAD implanted for fifteen days in calves. A natural endothelial cell surface has excellent thromboresistant characteristics. The quantity and the characteristics of the neointima formed into LVAD are determined by the material surface, hemodynamics of the blood through the device, and the physico-pathological conditions. The patch implantation into the abdominal aorta of pigs has isolated some normal variables that usually are present during LVAD utilization and that may interfere on the material biocompatibility. The evaluation of the materials characteristics has been enhanced through its implantation at the descending aorta wall in contact with blood flow. Different kinds of contact surfaces of specific polyurethane are tested in seven In Vivo experiments. This study is totally focused in the reaction of the blood-material interface. A histogical study is performed in the end of every animal experiment to analyze the interactions between blood and biomaterial. Its emphasized the quantification and qualification of the neointima over the blood contact surface, calcification, and blood depositions
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Fry, Bryan D. „Test and evaluation of the micro-observer sensor system for use as a seismic surveillance device in an integrated sensor network“. Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://edocs.nps.edu/npspubs/scholarly/theses/2007/Jun/07Jun%5FFry.pdf.
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Thesis (M.S. in Operations Research)--Naval Postgraduate School, June 2007.Thesis Advisor(s): Whitaker, Lyn. "June 2007." Description based on title screen as viewed on August 15, 2007. Includes bibliographical references (p. 193-197). Also available in print.
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McCrone, Tim M. „The Creation of an Anodic Bonding Device Setup and Characterization of the Bond Interface Through the use of the Plaza Test“. DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/695.
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Recently there has been an increased focus on the use of microfluidics for the synthesis of different products. One of the products proposed for synthesis is quantum dots. Microfluidics often uses Polydimethylsiloxane for structure in microfluidic chips, but quantum dots use octadecene in several synthesis steps. The purpose of this work was to create a lab setup capable of anodically bonding 4” diameter wafers, and to characterize the bond formed using the Plaza test chip so that microfluidic devices using glass and silicon as substrates could be created.
Two stainless steel electrodes placed on top of a hot plate were attached to a high power voltage supply to perform anodic bonding. A Plaza test mask was created and used to pattern P type silicon wafers. The channels etched were between 300 and 500nm deep and ranged between 1000µm and 50µm. These wafers were then anodically bonded to Corning 7740 glass wafers. Bonding stopped once the entire surface of the wafer was bonded, determined by visual inspection. All bonds were formed at 400°C and the bond strength and toughness between wafers bonded at 400V and 700V was compared.
A beam model was used to predict the interfacial fracture toughness, and the stress at the bond was calculated with a parallel spring model. By measuring the crack length of the test structures under a light microscope the load conditions of the beam could be found. It was concluded that the electrostatic forces between the wafers give the best indication of what the bond quality will be. This was seen by the large difference in crack length between samples that were bonded using a thick glass wafer (1 mm) and a thin glass wafer (500µm). The observed crack lengths for the thick glass wafers were between 40 and 60µm. Thin glass wafers had a crack length between 20 and 40µm. The fracture toughness was calculated using the beam model approximation. Fracture toughness of the thin glass wafers was 7MPa m1/2, and of the thick glass wafers was 30 MPa m1/2. The fracture toughness of the thick glass wafers agreed with results found through the use of the double cantilever beam samples in literature. The maximum observed interfacial stress was 70 MPa.
Finally, to measure the change in the size of the sodium depletion zone formed during bonding, samples were placed under a scanning electron microscope (SEM). Depletion zones were found to be between 1.1 and 1.4µm for thin glass samples that were bonded at 400 and 700 volts. This difference was not found to have a significant effect on the strength or fracture toughness observed. Thicker glass samples could not have their depletion zone measured due to SEM chuck size.
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Eicholtz, Matthew R. „Design and analysis of an inertial properties measurement device for manual wheelchairs“. Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34677.
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The dynamics of rigid body motion are dependent on the inertial properties of the body - that is, the mass and moment of inertia. For complex systems, it may be necessary to derive these results empirically. Such is the case for manual wheelchairs, which can be modeled as a rigid body frame connected to four wheels. While 3D modeling software is capable of estimating inertial parameters, modeling inaccuracies and ill-defined material properties may introduce significant errors in this estimation technique and necessitate experimental measurements. To that end, this thesis discusses the design of a device called the iMachine that empirically determines the mass, location of the center of mass, and moment of inertia about the vertical (yaw) axis passing through the center of mass of the wheelchair.
The iMachine is a spring-loaded rotating platform that freely oscillates about an axis passing through its center due to an initial angular velocity. The mass and location of the center of mass can be determined using a static analysis of a triangular configuration of load cells. An optical encoder records the dynamic angular displacement of the platform, and the natural frequency of free vibration is calculated using several techniques. Finally, the moment of inertia is determined from the natural frequency of the system.
In this thesis, test results are presented for the calibration of the load cells and spring rate. In addition, objects with known mass properties were tested and comparisons are made between the analytical and empirical inertia results. In general, the mass measurement of the test object had greater than 99% accuracy. The average relative error for the x and y-coordinates of the center of mass was 0.891% and 1.99%, respectively. For the moment of inertia, a relationship was established between relative error and the ratio of the test object inertia to the inertia of the system. The results suggest that 95% accuracy can be achieved if the test object accounts for at least 25% of the total inertia of the system. Finally, the moment of inertia of a manual wheelchair is determined using the device (I = 1.213 kg-m²), and conclusions are made regarding the reliability and validity of results. The results of this project will feed into energy calculations for the Anatomical Model Propulsion System (AMPS), a wheelchair-propelling robot used to measure the mechanical efficiency of manual wheelchairs.
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Boucher, Laura C. „Lower Extremity Anthropometry, Range of Motion, and Stiffness in Children and the Application for Modification and Validation of the Anthropomorphic Test Device“. The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397762041.
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Kimhag, Jenny, und Gabriella Lindmark. „The PhonicStick : A South African pilot study about learning how to use a communication device for early literacy training“. Thesis, Uppsala University, Logopedi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-113710.
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Literacy is an important part of communication. Phonological awareness, i.e. the ability to recognise the sound units of language and to manipulate them, has been found to be crucial in literacy acquisition.
In 2005 the development of a communication device, a talking joystick called the PhonicStick, started at The School of Computing at the University of Dundee in Scotland. The main focus with the project was to help children with physical disabilities to create spoken words by blending sounds together on the PhonicStick. It was also hypothesized that the PhonicStick could act as a support to literacy learning with typically developing children.
The aim of the present study was to investigate if a group of 10 typically developing South African 5-6 year old children could learn how to use the PhonicStick in three sessions and to see if their phonological awareness improved by using it. The training with the PhonicStick took place over a period of three weeks. The participants’ phonological awareness was screened before and after the sessions with two sub-tests of The Phonological Awareness Test (PHAT). In addition, their ability to produce sounds and words with the PhonicStick was tested.
The results showed that all the participants appeared to be interested in the PhonicStick and that they found it relatively easy to manoeuvre. The participants’ ability to produce sounds and words on the PhonicStick showed a statistically significant improvement from the first session to the third session. The participants’ phonological awareness skills did not appear to improve after three sessions. More time is needed to find out if this training would result in improved phonological awareness skills.
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Low, Benjamin. „Design of a 3 axis wear testing device to evaluate the effect of slide to roll ratio on ultra high molecular weight polyethylene wear in total knee replacements“. Thesis, University of Canterbury. Mechanical Engineering, 2005. http://hdl.handle.net/10092/1105.
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Multidirectional motion occurs in total knee replacements (TKR), is a major factor in ultra high molecular weight polyethylene (UHMWPE) wear and is a requirement for wear tester and simulators. There are three ways the femoral component can move relative to the tibial component; sliding, rolling and gliding and these are defined by the slide to roll ratio. Previous wear tester research has investigated the effects of multidirectional motion and slide to roll ratio, individually but not combined. The project aim was to design a machine that combined multidirectional motion with variable slide to roll ratio. A three station wear testing machine was designed and built featuring flexion extension, variable anterior posterior translation, variable internal external rotation and a 2KN load per station. The TKR was simplified to a cylinder on flat. Lubrication was 25% bovine serum and each station had its own recirculation system. A million cycle validation test was successfully carried out on non-irradiated UHMWPE samples using a slide to roll ratio of 1 : 0.5 and the mean wear rate was 14.7mg/10^6 cycles. Polished areas and scratches from 3rd body abrasion were observed. Magnification revealed a fine ripple pattern with a 1-2 micron periodicity. Ripples were randomly oriented, perpendicular to the primary direction of motion and a small number were running parallel to the primary direction of motion, indicative of rolling motion. The results from the validation study show that the knee joint wear tester is capable of producing wear rates and wear mechanisms similar to those observed in other wear testers and knee joint simulators and has met the aim of the project.
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Nerlikas, Arūnas. „Loginių įtaisų testavimo sistemos tyrimas“. Master's thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20060623_115409-46018.
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The analysis of logic device characterization have been performed. Logic device sorts and its characterization analysis was made. The analysis of other logic device test system was performed. The logic test system requirements was made. The hardware project of logic device test system and system hardware mounting was made. The software for the logic device test system was made. Experimentation of logic device test system was performed. The results of experimentation was given. Graphs about logic test system analysis of trustiness research was given. Performed finding about the logic device test system accordance for technical requirements, trustiness and universality.