1,720,962 research outputs found
Voltage build-up time responses of Kelvin’s water droplet generator: Variations due to different geometric configurations
No full textElectrokinetic diffusioosmotic flow of Ostwald-de Waele fluids near a charged flat plate in the thin double layer limit
No full textElectrokinetic diffusioosmosis of viscoelastic Phan-Thien-Tanner liquids in slit microchannels
No full textWall polymer depletion effects on electrokinetic diffusioosmosis of power-law liquids in cylindrical capillaries
No full textFinite double layer and non-Newtonian power-law effects on electrokinetic diffusioosmotic flows in parallel plate microchannels
No full textAutomated Non-Invasive Basal-Cell Carcinoma Detection by Convolutional Neural Network
No full text基底細胞癌是一種最常見的皮膚癌，而傳統上，它必須透過侵入式且耗時的組織學檢測，因此活體內顯影的技術，比如說HGM，被用來當做非侵入式的診斷基礎，但HGM會產生大量的影像導致檢測人員需要花大量的時間去檢測。在這篇論文中，我們最主要集中在如果使用客製化且有效率的CNN模型來去自動偵測BCC的特徵，我們最好的模型可以達到比AlexNet更好的結果，而且只需要AlexNet不到1\%的參數量。而這篇論文的方法也可以套用在其他相似的醫療圖片上。Diagnosis of basal cell carcinoma (BCC), the most common skin cancer, is made by histologic examination traditionally. Yet the process is invasive and time-consuming. In vivo imaging modalities such as harmonic generation microscopy (HGM) was therefore developed for noninvasive diagnosis of BCC. However the images acquired by HGM are too many for physicians to interpret manually. Thus, in this paper we focus on detecting features of BCC automatically by customizing compact and efficient convolutional neural network (CNN) models on HGM images of BCC. Our best model achieves a better result than AlexNet cite{krizhevsky2012imagenet}, while using less than its 1\% number of parameters. The study indicated the potential solution of using customized CNN to detect the features in similar imaging modalities
Enhancement of Mass Transport and Separation of Species by Pulsatile Electroosmotic Flows
No full text本文以數學解析之模式探討二維微流道中，由脈動式電滲透流所誘發的物質傳輸以及溶質分離之現象。在流道上下板電雙層互不影響、線性化之電場、不可壓縮且流線方向完全發展之流場，以及電中性物質之稀薄溶液的假設下，電雙層線性化電場、電滲流速度場，以及被傳輸物質濃度場為非偶合之統馭方程式所描述，並得以由格林函數所解出。結果顯示，微流道中的速度與濃度分布(場)會因為無因次震盪頻率(Womersley數)數值之提升，而愈趨非均勻分布。計算結果亦透露，流場在固定的震盪幅度(固定流率)之下，物質平均傳輸率會因為無因次頻率提升所增強的對流與物質分散效應(Dispersion Effects)而提高。在放大流場振幅的同時，平均質傳率也會因為對流效應之強化而增加。不同物種之間平均質傳率的越跨現象(Cross-Over Phenomenon)會因為德拜厚度(Debye Length)之增厚與震盪頻率的提升而愈趨明顯。當此越跨現象能有效提升質傳擴散係數較高物質之平均質傳率時，此一脈動式電滲流動即可成為生物晶片中，對溶質進行初步分離之基礎設計。Mass transport induced by pulsatile electroosmotic flows in a two-dimensional microchannel is studied theoretically herein. With the assumptions of non-overlapping electrical double layers, linearized electrical potentials, streamwise fully-developed incompressible flows, and an infinitely dilute solution of neutral species, the governing equations for the electrical potential, the velocity field, and the species concentration distribution are solved analytically. The results indicate that the velocity and concentration distributions across the channel become more and more non-uniform as the Womersley number , or the oscillation frequency, increases. Results also reveal that, with a constant tidal displacement, the averaged mass transport rate increases with the Womersley number due to both the stronger convective and transverse dispersion effects. The averaged mass transport rate also increases with an increasing tidal displacement because of the associated stronger convective effects. The cross-over phenomenon of the mass transport rates for different species becomes possible with sufficiently large Debye lengths and at sufficiently high values of . As a result, with proper choices of the Debye length, oscillation frequency, and tidal displacement, pulsatile electroosmotic flow may become a good candidate for the first-step separation of the mass species.Table of Contents
Chinese Abstract……………………………………………………i English Abstract………………………………………………….ii Acknowledgement and Dedication.........................iv Table of Contents………………………………………….…… ix Table Captions……………………………………………………..x Figure Captions……………………….………………….......xi Nomenclature...…………………….………………………….xiii
Chapter 1: Introduction………………………………….……..1 Chapter 2: Assumptions, Nondimensionalization, and Formulation……………...................................5
(a) Electrical Field...………………………………….5
(b) Velocity Field………………………………………..7
(c) Concentration Field……………………………….…9
Chapter 3: Mathematical Solutions………………….……….13
(a) Electrical Field...……………………………………...13
(b) Velocity Field………………………………………………13
(c) The Lagrangian Displacement and Tidal Displacement…………...................................15
(d) Concentration Field…………….………………………..16
(e) The Time and Space Averaged Mass Transfer Rate……………….......................................18
Chapter 4: Results and Discussion……………………………21
(a) Limitation on Constant Tidal Displacement due to Power Input…..........................................21
(b) The Velocity Profile…….………………………...22
(c) The Convective Concentration Distribution…….23
(d) The Time/Space Averaged Mass Transport………..25
(e) Cross-Over Phenomenon and Separation of Species................................................27
Chapter 5: Concluding Remarks and Future Works.………..30 References………………………………………………………...32 Tables……………………………………………………………...34
Figures.…………………………………………………………….3
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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