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Dissertations / Theses on the topic 'Contactless method'

Author: Grafiati

Published: 4 June 2025

Last updated: 15 July 2025

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Haque, Md Ashraful. "Corona Induced Electrohydrodynamics: A Contactless Method to Manipulate Liquids." University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1547224208781492.

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Šutinys, Ernestas. "The investigation of wire rope defect using contactless dynamic method." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140129_143028-76534.

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The dissertation investigates the diagnostics of wire rope by using forced characteristics. The main object of research is defects of prestressed ropes using a dynamic systems characteristic. The primary purpose of this dissertation is to research the characteristics of a prestressed rope with outside of broken wire and to create research methodology of broken wires and determine its location. The paper approaches a few major tasks such as by experiment detecting the dynamic characteristics of the wire rope and detection broken wire on the surface of the wire rope using dynamic characteristics. Task 1 is formulated as the literature review found that the wire rope defects detected by using of the dynamic characteristics received little attention. Task 2 relates to the first problem solution, as measured by vibrating amplitude of broken wire, it is important to assess the reliability of measuring instruments. The introduction reveals the investigated problem, importance of the thesis and the object of research and describes the purpose and tasks of the paper, research methodology, scientific novelty, the practical significance of results examined in the paper and defended statements. The introduction ends in presenting the author’s publications on the subject of the defended dissertation, offering the material of made presentations in conferences and defining the structure of the dissertation. Chapter 1 analysis used literature. It contains a wire rope defects and diagnostic... [to full text] Disertacijoje nagrinėjama plieninių lynų defektų nustatymas taikant jėgines charakteristikas. Pagrindinis tyrimo objektas yra įtemptų plieninių lynų defektų nustatymas naudojant lyno, kaip dinaminės sistemos, savybes. Pagrindinis disertacijos tikslas – ištirti įtempto plieninio lyno su išoriniame sluoksnyje nutrūkusiomis vielomis savybes ir sukurti nutrūkusių vielų bei jų vietos nustatymo tyrimų metodiką. Darbe sprendžiami keli pagrindiniai uždaviniai: eksperimentiškai nustatytos plieninio lyno dinaminės charakteristikos ir naudojant jas aptinkamos įtempto plieninio lyno paviršiuje nutrūkusios vielos buvimo vieta. Pirmasis uždavinys suformuluotas, nes atlikus literatūros apžvalgą nustatyta, kad plieninių lynų defektams aptikti naudojant dinamines charakteristikas skirta mažai dėmesio. Antrasis siejasi su pirmojo uždavinio sprendimu, nes kai matuojamos virpančios nutrūkusios vielos amplitudės, labai svarbu įvertinti matavimo priemonių patikimumą. Disertaciją sudaro įvadas, trys skyriai, rezultatų apibendrinimas, naudotos literatūros ir autoriaus publikacijų disertacijos tema sąrašai. Įvadiniame skyriuje aptariama tiriamoji problema, darbo aktualumas, aprašomas tyrimų objektas, formuluojamas darbo tikslas bei uždaviniai, aprašoma tyrimų metodika, darbo mokslinis naujumas, darbo rezultatų praktinė reikšmė, ginamieji teiginiai. Įvado pabaigoje pristatomos disertacijos tema autoriaus paskelbtos publikacijos ir pranešimai konferencijose bei disertacijos struktūra. Pirmasis skyrius... [toliau žr. visą tekstą]

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Gursoy, Doga. "Multi-frequency Contactless Electrical Impedance Imaging Using Realistic Head Models: Single Coil Simulations." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608201/index.pdf.

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Contactless electrical impedance imaging technique is based upon the measurement of secondary electromagnetic fields caused by induced currents inside the body. In this study, a circular single-coil is used as a transmitter and a receiver. The purpose of this study is twofold: (1) to solve the induced current density distribution inside the realistic head model resulting from a sinusoidal excitation, (2) to calculate the impedance change of the same coil from the induced current distribution inside the head model. The Finite Difference Method is used to solve the induced current density in the head. The realistic head model is formed by seven tissues with a 1 mm resolution. The electrical properties of the model are assigned as a function of frequency. The quasi-stationary assumptions, especially for head tissues, are explored. It is shown that, numerical solution of only the scalar potential is sufficient to obtain the induced current density in the head below 10 MHz operating frequency. This simplification not only reduce the excessive size of the solution domain, but also reduces the number of unknowns by a factor of 4. For higher frequencies (depending on the application) induction and propagation effects become important. Additionally it is observed that dynamic monitoring of hemorrhage at any frequency seems feasible. It is concluded that the methodology provides useful information about the electrical properties of the human head via contactless measurements and has a potent as a new imaging modality for different clinical applications.

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Meesala, Vamsi Chandra. "Nonlinear Effects in Contactless Ultrasound Energy Transfer Systems." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/101752.

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Ultrasound acoustic energy transfer (UAET) is an emerging contactless technology that offers the capability to safely and efficiently power sensors and devices while eliminating the need to replace batteries, which is of interest in many applications. It has been proposed to recharge and communicate with implanted medical devices, thereby eliminating the need for invasive and expensive surgery and also to charge sensors inside enclosed metal containers typically found in automobiles, nuclear power plants, space stations, and aircraft engines. In UAET, energy is transferred through the reception of acoustic waves by a piezoelectric receiver that converts the energy of acoustic waves to electrical voltage. It has been shown that UAET outperforms the conventional CET technologies that use electromagnetic waves to transfer energy, including inductive coupling and capacitative coupling. To date, the majority of research on UAET systems has been limited to modeling and proof-of-concept experiments, mostly in the linear regime, i.e., under small levels of acoustic pressure that result in small amplitude longitudinal vibrations and linearized piezoelectricity. Moreover, existing models are based on the "piston-like" deformation assumption of the transmitter and receiver, which is only accurate for thin disks and does not accurately account for radiation effects. The linear models neglect nonlinear effects associated with the nonlinear acoustic wave propagation as well as the receiver's electroelastic nonlinearities on the energy transfer characteristics, which become significant at high source strengths. In this dissertation, we present experimentally-validated analytical and numerical multiphysics modeling approaches aimed at filling a knowledge gap in terms of considering resonant acoustic-piezoelectric structure interactions and nonlinear effects associated with high excitation levels in UAET systems. In particular, we develop a reduced-order model that can accurately account for the radiation effects and validate it by performing experiments on four piezoelectric disks with different aspect ratios. Next, we study the role of individual sources of nonlinearity on the output power characteristics. First, we consider the effects of electroelastic nonlinearities. We show that these nonlinearities can shift the optimum load resistance when the acoustic medium is fluid. Next, we consider the nonlinear wave propagation and note that the shock formation is associated with the dissipation of energy, and as such, shock formation distance is an essential design parameter for high-intensity UAET systems. We then present an analytical approach capable of predicting the shock formation distance and validate it by comparing its prediction with finite element simulations and experimental results published in the literature. Finally, we experimentally investigate the effects of both the nonlinearity sources on the output power characteristics of the UAET system by considering a high intensity focused ultrasound source and a piezoelectric disk receiver. We determine that the system's efficiency decreases, and the maximum voltage output position drifts towards the source as the source strength is increased. Doctor of Philosophy Advancements in electronics that underpinned the development of low power sensors and devices have transformed many fields. For instance, it has led to the innovation of implanted medical devices (IMDs) such as pacemakers and neurostimulators that perform life-saving functions. They also find applications in condition monitoring and wireless sensing in nuclear power plants, space stations, automobiles and aircraft engines, where the sensors are enclosed within sealed metal containers, vacuum/pressure vessels or located in a position isolated from the operator by metal walls. In all these applications, it is desired to communicate with and recharge the sensors wirelessly. Such a mechanism can eliminate the need for invasive and expensive surgeries to replace batteries of IMDs and preserve the structural integrity of metal containers by eliminating the need for feed through wires. It has been shown that ultrasound acoustic energy transfer (UAET) outperforms conventional wireless power transfer techniques. However, existing models are based on several assumptions that limit their potential and do not account for effects that become dominant when a higher output power is desired. In this dissertation, we present experimentally validated numerical and theoretical investigations to fill those knowledge gaps. We also provide crucial design recommendations based on our findings for the efficient implementation of UAET technology.

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Sahlman, Alex, and Henry Zhang. "Nästa steg i betalningsbranschensutveckling? : En kvalitativ studie om kontaktlösbetalningsmetod ur ett bankperspektiv." Thesis, Södertörns högskola, Institutionen för samhällsvetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-30754.

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Syftet med denna studie var att undersöka framtidsutsikter och utmaningar för kontaktlös betalningsmetod som är NFC-baserad. Detta mynnade ut i frågor som undersökte kring varför enbart ett fåtal banker valt att satsa på kontaktlösa betalkort, vilka utmaningar som NFC-baserade betalningar står inför i den svenska marknaden och även vilka framtidsutsikter den kontaktlösa betalningsmetoden har i den svenska betalningsbranschen. För att svara på dessa frågor, tillämpades en kvalitativ fallstudie med semistrukturerade intervjuer. Två respondenter från varsin bank som infört kontaktlös betalningsmetod i Sverige intervjuades, likaså en respondent från en bank som inte hade infört kontaktlös betalningsmetod i Sverige och ytterligare två respondenter från en annan bank som inte infört kontaktlösa betalningsmetoder i Sverige. Utöver detta, intervjuades även en forskare från Sveriges riksbank och en konsult som arbetar inom ett forum för kontaktlös betalningsmetod. Studien påvisade att anledningen till att ett fåtal banker erbjudit kontaktlös betalningsmetod till sina kunder var till följd av att Sverige varit relativt sena med att byta från magnetremsa som betalningsmetod till chip och PIN, vilket gjort att man ogärna investerade i kontaktlös betalningsmetod. Utmaningar som kontaktlös betalningsmetod står inför är att se till att infrastrukturen utökas i Sverige samt informera kunder om kontaktlös betalningsmetod. Framtidsutsikterna för kontaktlös betalningsmetod är positiva och tanken bland flera aktörer är att kontaktlös betalningsmetod ska vara väldigt utbrett i Sverige år 2020. The purpose of this research was to investigate future prospects and challenges regarding contactless payment method which is based on NFC. These lead to the formulation of questions which researched why only a few banks had chosen to employ contactless payment cards, which challenges that NFC-based payments are facing in the Swedish market, and also which future prospects the contactless payment method has in the Swedish payment market. In order to answer these questions, a qualitative case study with semi-structured interviews was utilized. Interviews were conducted with two respondents from respective banks which had introduced contactless payment in Sweden while additional interviews were conducted with one respondent from a bank which had not introduced contactless payment in Sweden and two respondents from another bank which had not introduced contactless payment methods in Sweden. In addition to this, one respondent from the central bank of Sweden and one consultant working within a forum regarding contactless payment have been interviewed. The study showed that the reason to why few banks have offered contactless payment method to their customers was due to that Sweden had been relatively late in regards to changing from magnetic strip as a payment method to chip and PIN, which resulted in that the market participants did not wish to invest in the contactless payment method. Challenges which the contactless payment method is facing, is to make sure that the infrastructure will be increased in Sweden, and inform customers about the contactless payment method. The future prospects for the contactless payment methods are positive and the intention among several market participants is that the contactless payment method will be very widespread in Sweden 2020.

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Xu, Ye. "Kilowatt Three-phase Rotary Transformer Design for Permanent Magnet DC Motor with On-rotor Drive System." Thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-27781.

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The aim of this thesis is to design a kilowatt three-phase step-down rotary transformer for a permanent magnet DC motor. The permanent magnet DC motor has an on-rotor drive system, and therefore requiring a power supply that can transfer power to its drive unit without mechanical contact. The rotary transformer has a detached magnetic coupling structure that qualifies it as a potential method for the wireless power transfer. This thesis studies the rotary transformer as a static device, focusing on its core loss. By using a transient finite element analysis of COMSOL Multiphysics and an iron loss prediction model, the rotary transformer was optimized in terms of efficiency and power density for the on-rotor drive system through proper material selection and geometry exploration. After this, a mechanical design, which based on a literature review of the influences of manufacturing processes on electrical steels, was proposed for realizing the core fabrication and the rotary transformer assembly. The results show that the rotary transformer can step down 400 V/50 Hz three-phase voltage to 13.15V in a Delta-wye connection and output 1.17kW power over an air-gap of 0.3mm with 95.94% overall efficiency. The proposed mechanical design enables the transformer to minimize the core loss and the manufacturing cost. Without using resonant inductive coupling, this transformer design simplifies the power supply for the motor, thereby decreasing the motor manufacturing and maintenance cost.

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Кім, А. А. "Інноваційні технології управління ресторанним бізнесом". Thesis, Одеський національний економічний університет, 2020. http://dspace.oneu.edu.ua/jspui/handle/123456789/12528.

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У роботі розглядаються теоретичні основи технології управління в системі суб’єктів бізнесу. Визначено компоненти та складові інноваційних рішень в ресторанному бізнесі. Проаналізовано тенденції розвитку ресторанного бізнесу та виявлено основні фактори, які впливають на розвиток ресторанного бізнесу під час пандемії. Проаналізовано інноваційні можливості розвитку ресторанного бізнесу та обґрунтовано інноваційний напрям розвитку сервісу доставки ресторану, та доцільність інноваційної технології безконтактних розрахунків за QR-кодом. The paper considers the basics of management technology in the system of business entities. The components and components of innovative solutions in the restaurant business are defined. Analyze trends in the restaurant business and identify the main factors influencing the development of the restaurant business during a pandemic. Analyze the innovative opportunities for the development of the restaurant business and justify the innovative direction of development of the restaurant delivery service, and the feasibility of innovative technology of contactless payments by QRcode.

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Vidal, Denis Tadeu Rajh. "Investigação por eletroforese capilar com detecção condutométrica sem contato sobre a formação e as propriedades de monoalquil carbonatos em meio aquoso." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-31012012-153743/.

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A formação dos monoalquil carbonatos (MACs) em meio aquoso - produzidos pela reação de um álcool e bicarbonato foi investigada por eletroforese capilar (CE) com detecção condutométrica sem contato (C4D). Foram estudadas ao todo 29 substâncias, das quais 25 apresentaram formação de adutos aniônicos monocarregados e 2 delas, adutos aniônicos com dupla carga. A eletroforese capilar proporcionou a obtenção de medidas de propriedades físico-químicas. Através do tempo de migração, foram obtidos mobilidade, coeficiente de difusão e raio iônico hidratado. Para os n-álcoois de 1 a 5 átomos de carbono, os adutos apresentaram raio iônico hidratado entre 216 pm e 310 pm. Os MACs têm raio iônico proporcional ao do álcool gerador, sendo sistematicamente maiores devidos à anexação do grupo carbonato. Quando comparado a ácidos carboxílicos de cadeia carbônica similar, os MACs possuem menor raio iônico hidratado. A obtenção dos valores da cinética de formação e hidrólise foi possível pela utilização de dupla detecção condutométrica, a qual permitia determinar a concentração do MAC em dois momentos diferentes ao longo da coluna. Devido à impossibilidade de uma calibração direta - já que os sais de MACs se decompõem em água - foi introduzida uma nova técnica de calibração que dispensa o uso de uma solução padrão do analito em favor de uma com espécie de mobilidade similar. As constantes cinética e termodinâmica foram comparadas com aquelas disponíveis na literatura, mostrando boa concordância, como no caso dos adutos para o metanol e etanol (a 25 ºC em meio aquoso), cujos valores da constante termodinâmica sugeridos pela literatura são de 3,57 e 1,80, respectivamente, enquanto que os valores calculados em nosso trabalho são de 4,2 e 2,3, a 25ºC. De forma similar ao ácido carbônico, os ácidos alquilcarbônicos (ACAs) se decompõem em meio ácido, o que dificulta a determinação da verdadeira constante de dissociação. Ainda assim, estudos em pH de 3 a 9, permitiram estimar os valores de pKa dos ácidos derivados de metanol, etanol e propanol como estando algo abaixo de 4, o que estaria em acordo com o valor de 3,6 do ácido carbônico. A formação de MACs também foi observada para dióis, como o etileno glicol e polióis, como o glicerol e manitol. Foi também possível observar, por eletroforese capilar, a formação de adutos aniônicos monovalentes para açúcares, tais como a sacarose, glicose e frutose. Por fim, a pesquisa revelou a possibilidade da formação de adutos com dupla carga - os bis(carbonatos) - para alguns dióis: o 1,4-butanodiol e o 1,6-hexanodiol. Esta é a primeira vez que estas espécies foram observadas. Estes resultados sugerem a formação de adutos aniônicos para várias outras classes de compostos, as quais possuam a hidroxila na cadeia carbônica. Embora, em meio predominantemente aquoso, estas espécies não estejam em alta concentração, trata-se de um novo conjunto de espécies a serem consideradas quando se trabalha em condições propícias. The formation of monoalkyl carbonates (MACs) in aqueous medium - resulting from an alcohol and bicarbonate - was investigated by using capillary electrophoresis with capacitively coupled contactless conductivity detection (C4D). Twenty nine substances were studied. The mono-charged anionic adducts were observed for 25 of them and double-charged species were observed for 2. Capillary electrophoresis allowed us to obtain some physical-chemical properties. The migration time was used to calculate the ionic mobility, coefficient of diffusion, and hydrodynamic radius. The radii ranged from 216 to 310 pm for the adducts formed from the n-alcohols of 1 to 5 carbon atoms, respectively. The MACs have radii proportional to the size of the alcohol, being systematically greater because of the attached carbonate group. When compared to carboxylic acids of similar carbonic chain, the MACs have smaller radii. The calculation of the kinetic constants was possible due to the double C4D detection, which allows quantitation of the MAC at two different moments along the capillary. Due to the decomposition of the MAC salt in water, a direct quantitation was not possible. Thus an indirect calibration approach was introduced, where the analyte is substituted by a stable species of similar mobility. Good agreement was obtained between the kinetic and thermodynamic constants obtained by this method and those ones available in literature. For instance, the methanol and ethanol adducts were 4.2 and 2.3 (at 25 ºC), respectively, while the literature\'s values are 3.57 and 1.80. Similarly to carbonic acid, the alkyl carbonic acids (ACAs) decompose in acid medium, which impairs the determination of the dissociation constant. Even so, studies from pH between 3 and 9 allowed us to estimate that the pKa values of the adducts for methanol, ethanol, and propanol are somewhat below 4, which is in agreement with the value 3.6 for the carbonic acid. MACs were also observed for diols and polyols as well as for sugars. Finally, double-charged species bis(carbonates) were formed with 1,4-butanediol and 1,6-hexanediol. This is the first time that these species are reported. Although the concentrations of these species are not high in an aqueous medium, they form a new set of substance to be considered in aqueous solution when the conditions are favorable.

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Lavický, Jiří. "Bezkontaktní měření v procesním inženýrství." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228945.

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The objective of my thesis is description of contactless measuring methods, their principle and distribution. There are compiled basic facts about the measurement of laser and ultrasound. In this work is also described non-contact temperature measurement. Part of thesis is non-contact flow measurement on the model.

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Славков, Віктор Миколайович. "Розробка цифрового фотографічного методу теплового контролю металів при високих температурах". Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/17036.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.11.13 - прилади і методи контролю та визначення складу речовин. Національний технічний університет "Харківський політехнічний інститут", Харків, 2015 р. Дисертацію присвячено розробці методу теплового контролю металів при температурах понад 600 °С із використанням, у якості детектора теплового випромінювання, цифрового фотоапарата. На основі встановлених теоретичних положень методу розроблені програмні алгоритми обробки цифрових зображень, що дозволили: провести процедуру калібрування цифрового фотоапарата у діапазоні яскравісних температур 500…1800 °С та встановити калібрувальні залежності у вигляді математичних рівнянь; здійснити тепловий контроль металевих пластин, об'ємних металевих зразків та встановити присутні в них дефекти; вирішити додаткові задачі теплового контролю металів, а саме встановити значення питомої масової теплоємності металу; моделювати рівномірні температурні поля на поверхні металевих пластин; встановити розподілення коефіцієнта теплового випромінювання поверхні металевих пластин. Thesis for granting the Degree of Candidate of Technical sciences in speciality 05.11.13 - devices and methods of testing and materials composition determination. - National Technical University "Kharkiv Politechnical Institute", Kharkiv, 2015. The dissertation is devoted to development of a thermal control metals method at temperatures above 600 °C using as thermal radiation detector, digital camera. On the basis of the established method of theoretical positions were developed software algorithms for digital image processing that allowed: to carry a digital camera calibration brightness temperature in the range of 500...1800 °C and set the calibration curve in the form of mathematical equations; perform thermal control of metal plates, bulk metallic samples and established the presence of defects; to solve additional tasks of thermal metals control, namely to establish the value of the specific heat capacity of the metal mass; simulate uniform temperature field on the surface of the metal plates; determine the distribution coefficient of thermal radiation from the metal plates surface.

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Lin, Chin-chou, and 林智洲. "A New Method for Contactless Directional Operation Interface." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/7ysrk8.

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碩士 國立臺灣科技大學 資訊管理系 99 Friendly user interface has long been the research goal for both academic and industrial communities of human computer interaction. With the advances of software and hardware technologies, more intuitive ways of interaction, including multi-touch and body controls, were invented. Though such methods as Kinect can release the constraint of contact surface for such directional methods as mouse or multi-touch, they are however more expensive generally, and might invade users' privacy because they need acquire users' images. Some methods utilize G-sensors, but the weights of the devices prohibit them from being continuously used for a long period of time. This paper makes use of the location function with infrared signals provided by Wii remote to realize a contactless user interface for menu selection. Five modes of interaction were proposed to overcome the constraint of single message channel for the infrared signals. The control device could be as light as a pen, while the operation could be accomplished even in a dark room. A prototype system for controlling both the menu selection and the slides playing was built successfully to verify the validity of the interface design.

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Zeng, Yong-Zhen, and 曾詠禎. "Optimization of Contactless Power Transmission System by Taguchi Method." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/67423715225103945823.

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碩士 逢甲大學 電機工程學系 103 Abstract Contactless power transmission system (CPTS) transfers energy by electromagnetic coupling. Due to the high security features of the CPTS the magnetic field is inductively coupled to transfer energy to the secondary load side. This system has a large air gap, large leakage inductance, low magnetizing inductance and a low coupling coefficient. In this study, high-power contactless switches were developed by using resonance compensation to enable the circuit to achieve impedance matching. The Taguchi method was used to optimize efficiency of the experimental system. The purpose of using electricity transmission was to improve the overall efficiency. The robust design from the Taguchi method was used to predict optimum parameters in this experiment. For each factor, the level with highest S/N ratio in the response table was selected as the optimum condition. This study showed that Taguchi method can improve the system efficiency. The increment in the S / N ratio also results in the increment of the system efficiency from 75.2 % to 80.47 %. The results confirmed the use of the Taguchi optimization experimental method improves the overall system efficiency.

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Huang, Kuo-Ming, and 黃國銘. "A Contactless Heart Rate Measurement Method Based on Facial Landmark Approach." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/skf76n.

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碩士 國立臺灣科技大學 電子工程系 106 About ten years ago, the remote measurement of the cardiac pulse via a consumer camera was proposed by some scholar. Recent studies showed the method of contactless heart rate measurement has been developed from the measurement of the subject's quiescent state to the measurement of the subject in a slight dynamic state. In order to let the subject do not need to deliberately maintain the static state during the measurement process, and can measure more easily and freely. This thesis focuses on the heart rate measurement technique which allows measure from subject movement, and implement and analysis these techniques. The experiment result shows the ROI positioning and tracking method based on optical flow is more suitable to measure from the subject stay still or small motion state. And the ROI positioning and tracking method based on facial landmark is more suitable to measure from the subject movement state.

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Chia-ChengTu and 杜嘉正. "Design, Fabrication and Measurement of Microfluidic Blood Chip Using Capacitively Coupled Contactless Conductivity Detection Method." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/59405074240106407401.

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碩士 國立成功大學 機械工程學系碩博士班 101 Because of the complex reaction path and various blood coagulation factors, the blood coagulation dection can be used in understanding the function of liver. But, the blood coagulation test is usually performed by a relatively large centrifuge in the laborary traditionally and unfavorable to clinical application. Lab on a chip is the kind of chip integrating the many processes into one chip in order to reduce the cost and time of production and experiment. In this study, we design the lab on a chip using in the blood coagulation detection in order to improve the weakness of clinical application and reduce the experiment time. Although the capacitively coupled contactless conductivity detection, our chip can offer the standard value from quantifiable data and also reduce the error of blood sample because of the contacting with senor during the measurement. In the driving blood respect, we succeeded in using the capillary force to drive the blood in the channel without any external driving resource. So, it’s much potential to apply to integrate with the other device From the results, we found the great self-driven ability of chip. At the 80TH minute after injection, we can observe blood completely flow through the channel of the chip. By quantitative analysis and linear regression, we also defined the specification of the chip. The chip presented low error, 2.0-3.0 pF, and great repeatability. The relationship between blood and capacitance in the various frequencies has been discussed. We found the the capacitance change of the blood in the chip is about 0.5-2.0 pF closing to the theory value 1.8 pF and the fitting result of the relationship between time and capacitance is similar to the result of theory. Finally, through comparing with the CT (Clotting time) of microfluidic chip and aPTT (Activated partial thromboplastin time) determined form blood coagulation analyzer CA-50, we found the R square is pretty high equal to 0.9084 at the CT of 90 percent capacitance. These results show the characteristic and feasibility of blood coagulation detection in the capacitive capillary chip. In the future, it’s no doubt that this chip can be integrated with the other devices in order to apply in various fields.

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Po-YiLi and 李柏毅. "Development of A Contactless Micro-Size Metallic Film Testing System and Design of Optimal Sensing Coil with Taguchi Method." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/f2cg52.

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Ling, Johannes Daniel [Verfasser]. "Entwicklung, Aufbau und Test eines kontaktfreien Messverfahrens zur Bestimmung der elektrischen Leitfähigkeit dichter Plasmen = Development, realization and test of a contactless measurement method for the determination of the electrical conductivity of dense plasmas / von Johannes Daniel Ling." 2011. http://d-nb.info/1011140551/34.

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Andersson, David. "A survey on contactless payment methods for smartphones." Thesis, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-12867.

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Abdul, Keyon AS. "New capillary electrophoresis methods for the analysis of paralytic shellfish poisoning toxins." Thesis, 2014. https://eprints.utas.edu.au/20048/1/front-Abdul%20Keyon%2C%20Aemi-thesis.pdf.

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Paralytic shellfish poisoning (PSP) toxins, or usually termed as paralytic shellfish toxins (PSTs), produced by marine and freshwater microalgae during algal blooms can accumulate in filter-feeding bivalve shellfish. Early detection of PSTs in shellfish is therefore important for food and public health safety. High performance liquid chromatography (HPLC) methods with pre- or post-column oxidation for fluorescence detection (FLD) and HPLC-mass spectrometry (MS) are the most widely used instrumental analytical methods for PSTs, but are not easily miniaturised for field-deployable portable analyser. Capillary electrophoresis (CE) can be developed as an alternative method as it is compatible with miniaturisation, making it an attractive method for a portable analyser for early on-site detection. In order to develop appropriate portable instrumentation for CE of PSTs, it is necessary to develop appropriate methods. This was first done by developing CE methods with different detection techniques namely ultraviolet (UV), capacitively coupled contactless conductivity detector (C4D), MS, and FLD - making this the first report of the use of C4D and an improved FLD detection for various PSTs with CE. Due to the fact that most oxidised PSTs were neutral, micellar electrokinetic chromatography (MEKC) was used in combination with FLD. The capillary zone electrophoresis-UV (CZE-UV) and CZE-C4D methods provided better resolution, selectivity and separation efficiency compared to CZE-MS and MEKC-FLD methods. However, CZE-UV and CZE-MS methods did not provide sufficient sensitivity to detect PSTs at the regulatory concentration limit, while CZE-C4D and MEKC-FLD did show sensitivity below or close to the regulatory limit. The latter most portable methods were evaluated for the screening of PSTs in a naturally contaminated mussel sample. MEKC-FLD was successfully used for PSTs screening in the periodate-oxidised sample, whilst CZE-C4D method suffered from significant interferences from sample matrix; a result that motivated further investigation of an on-line preconcentration method to deal with the high conductivity sample matrix and improve the sensitivity. Therefore, CZE with C4D was examined with counter-flow transient isotachophoresis (tITP). The tITP system exploited the naturally high sodium concentration in mussel sample to act as a leading ion, in combination with one electrolyte acting as terminating electrolyte (TE) and background electrolyte (BGE). Optimisation of the BGE concentration, duration of counter-flow and injected sample volume suitable for tITP resulted in sensitivity enhancement of at least two-fold over CZE-C4D method developed in the first body of work. In particular, the modest gain in sensitivity was achieved in the existence of a high concentration of sodium, a sample matrix property that was problematic in previous method. This allowed the analysis of PSTs in mussel sample at below or close to the regulatory concentration limit. The pre-column periodate oxidation MEKC-FLD method described in the first body of work enabled direct screening of PSTs in shellfish sample; however some toxins produced multiple and/or identical oxidation products, affecting selectivity and specificity of the method. The findings initiated investigation of CE with droplet microfluidic post-column reaction system for the separation and FLD of PSTs. The concept was that PSTs were separated using CZE and electrophoretically transferred into droplets segmented by oil. Formation of droplets and electrical connection in the CE-droplet microfluidic system were first evaluated. Depending on the total flow rate of both aqueous and oil phases, nL-sized droplets could be formed having frequencies between 0.7-3.7 Hz. The use of an off-the-shelf micro cross for positioning a salt bridge across the droplet flow from the separation capillary outlet enabled the compartmentalisation of the analytes while maintaining the electrical connection. Further, the potential of the system was investigated for post-column oxidation of PSTs. Compartmentalised in the droplets, PSTs reacted with periodate oxidant already present in the droplets, in which only a single peak for each PST was detected by FLD. Given that the general objective of this research study is to develop suitable CE methods that can be implemented for on-site PSTs detection, the potentials of the developed methods compatible with miniaturisation and portability have been demonstrated. The CE methods with different detection techniques, combined with an on-line preconcentration and ability to be coupled with post-column reaction indicates the versatility of CE as alternative analytical method for PSTs.

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