11,817 research outputs found
The construction of Karen Karnak: The multi-author-function
No full textThis thesis is situated within the comparatively recent developments of Web 2.0 and the emergence of interactive WikiMedia, and explores the mode of authorship within a Read/Write culture compared to that of a Read/Only tradition. The hypothesis of this study is that the role of the audience has become merged with the author, and as such, represents new functions and attributes, distinct from a more conventional concept of authorship, in which the roles of audience and author are more separate. Read/Write and participatory culture, as defined by this study, is focused on collaboration, and includes the influences of D.I.Y. culture, Open-Source practices and the production of text by multiple authors. Multi-authorship presents a re-thinking of several concepts which support the notion of the individual author, since the focus of multi-authorship is not on attribution and ownership of a finished text, but on the continued malleability of a text. Modes of multi-authorship, demonstrated in the use of the pseudonyms Alan Smithee and Karen Eliot, represent declarative authors whose names signify multiple origins, whilst concurrently indicating a distinct body of work. The function of these names form an important context to this study, since primary research involves the construction of an experimental mode of multi-authorship utilising WikiMedia technology and the interaction of thirty nine participants, who are invited to create a body of work under the collective pseudonym Karen Karnak. The data generated by this experiment is analysed using aspects of Michel Foucault's author-function to identify and determine power structures inherent in the WikiMedia context. The interplay of power structures, including concepts such as identity, ownership and the body of work, affect the resulting mode of authorship and contribute to the construction of Karen Karnak, suggesting further areas of research into the emerging multi-author
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
Division in logspace-uniform NC¹
No full textBeame, Cook and Hoover were the first to exhibit a log-depth, polynomial size circuit family for integer division. However, the family was not logspace-uniform. In this paper we describe log-depth, polynomial size, logspace-uniform, i.e., NC¹ circuit family for integer division. In particular, by a well-known result this shows that division is in logspace. We also refine the method of the paper to show that division is in dlogtime-uniform NC¹
Ultra-thin electron collectors based on nc-Si:H for high-efficiency silicon heterojunction solar cells
No full textLow parasitic absorption and high conductivity enable (n)-type hydrogenated nanocrystalline silicon [(n)nc-Si:H], eventually alloyed with oxygen [(n)nc-SiOx:H], to be deployed as window layer in high-efficiency silicon heterojunction (SHJ) solar cells. Besides the appropriate opto-electrical properties of these nanocrystalline films, reduction of their thickness is sought for minimizing parasitic absorption losses. Many strategies proposed so far reveal practical limits of the minimum (n)-layer thickness that we address and overcome in this manuscript. We demonstrated the successful application of an ultra-thin layer of only 3-nm-thick based on (n)nc-Si:H PECVD plasma growth conditions without the use of additional contact or buffer layers. For simplicity, we still name (n)nc-Si:H this ultra-thin layer and the solar cell endowed with it delivers a certified efficiency η of 22.20%. This cell shows a 0.61 mA/cm2 overall JSC gain over the (n)a-Si:H counterpart mainly owing to the higher transparency of (n)nc-Si:H, while maintaining comparable VOC > 714 mV and FF > 80%. Our optimized (n)nc-Si:H layer yields low absorption losses that are commonly measured for (n)nc-SiOx:H films. In this way, we are able to avoid the detrimental effect that oxygen incorporation has on the electrical parameters of these functional layers. Further, by applying a MgF2/ITO double-layer anti-reflection coating, a cell with 3-nm-thick (n)nc-Si:H exhibits a JSC,EQE up to 40.0 mA/cm2. By means of EDX elemental mapping, we additionally identified the (n)nc-Si:H/ITO interface as critical for electron transport due to unexpected oxidation. To avoid this interfacial oxidation, insertion of a 2-nm-thick (n)a-Si:H on the 3-nm-thick (n)nc-Si:H contributes to FF gains of 1.4%abs. (FF increased from 78.6% to 80.0%), and showing further room for improvements.Photovoltaic Materials and DevicesQN/AfdelingsbureauElectrical Sustainable Energ
Interactive NC Code Generation for Bone Screws
No full text本研究之目的在於發展一套交談式骨螺絲NC(Numerical Control)碼產生模組。以模組化、特徵參數化的方法進行系統的發展。系統可由設計者輸入製造特徵參數而產生骨螺絲在特定加工機之對應NC碼。使NC碼撰寫快速且方便，大幅縮短人為NC碼撰寫時間和降低出錯的機率。
本系統針對多軸走心式自動化車床(Multi-axis stock sliding automatic lathe)，提出製造特徵的方法來進行系統設計。骨螺絲(Bone Screws)含有的主要製造特徵是外型、螺紋、多邊孔…等，各特徵含有相關的各種參數。系統軟體可由使用者透過對話視窗的方式，依照各種加工型態輸入特徵參數(Feature Parameters)及加工條件，自動產生可辨識格式之NC碼，傳輸到機台上加工。
使用者輸入參數產生NC碼前，該系統會自動檢查使用者輸入參數的數值，判別是否符合加工製造條件和空間幾何限制，以偵測條件參數錯誤與超出範圍之情形發生。以防止實際加工時，因條件及幾何參數錯誤所造成的成本損失或人身安全，並確保程式的準確性。
本系統中的骨螺絲(Bone Screws)各種特徵參數設計是以ASTM F543-02(American Society for Testing and Materials)規範的標準來設計。若使用者欲更改既定的規範參數，亦可由對話方塊修改內部數值。該系統方便使用者依需求來產生NC碼，完成骨螺絲的NC加工。The purpose of this thesis is to develop an interactive module of NC code generation for bone screws. A modular, feature parametric method is adopted for system development. For a specific NC machine, the corresponding NC code of bone screws can be generated through the inputs of feature parameters. This module makes NC code generation fast and convenient, and relieves manual burden and human error.
Targeting on multi-axis stock sliding automatic lathe, the method using manufacture features is proposed for system design. Bone screws contains principal manufacturing features which are the profile, thread, polygonal hole…etc. Each feature contains certain defining feature parameters. The system software allows the user to input feature parameters and the machining conditions through dialog boxes in accordance with the various types of the machining processes. Identifiable format of NC code can be automatically generated and transmitted to the machine platform for processing.
Prior to the NC code generation after parameter input, the system will automatically check the user input parameters for restrictions of machining conditions and geometric interference, as to detect numerical and conditional error of parameters. In practice, it will prevent the geometric and condition errors and thus will reduce cost loss and increase personnel safety and degree of accuracy of programs.
In this system, feature definitions for design of bone screws are conforming to the specification of ASTM F543-02. To modify the default parametric values, users can altered those numbers through dialog boxes. The system is able to interactively generate NC code for bone screws according to the demands of users.中文摘要 I
英文摘要 II
目 錄 III
第一章 介紹 1
1.1 前言 1
1.2 文獻回顧 2
1.3 研究目的與方法 4
1.4 內容大綱 6
第二章 NC碼製作方法 7
2.1 走心式車床加工原理 7
2.1.1 櫛式刀具排列介紹 9
2.2 NC碼製程分析 12
2.2.1 正面加工 15
2.2.2 背面加工 20
第三章 系統架構介紹 22
3.1 特徵為基概念與系統架構 22
3.2 系統操作介面 26
第四章 NC碼檢查與適用範圍 27
4.1 自動檢查參數值 27
第五章 執行與結果討論 29
5.1 交談式骨螺絲NC碼自動產生系統的架構說明 29
5.2 範例操作 30
5.3 結果討論 42
第六章 結論與未來展望 43
6.1 結論 43
6.2 未來展望 44
參考文獻 45
附錄A G碼 47
附錄B M碼 48
附錄C 圖號為204014A-015之NC碼 4
Texturing approaches for the fabrication of nc-Si:H/c-Si tandem devices
No full textThis thesis is dedicated to the fabrication of a novel silicon based tandem cell which combines hydrogenated nanocrystalline silicon (nc-Si:H) thin film(TF) photovoltaic (PV) technology and silicon heterojunction (SHJ) c-Si based PV technology. As a matter of fact, the growth of nc-Si:H on a flat c-Si substrate is not uniformas it irregularly peels off after deposition using the plasma enhanced chemical vapor deposition (PECVD). On the other hand, the growth of the nc-Si:H TF layers on the standard alkaline textured c-Si substrate with sharp pyramidal structures results in defective regions in the bulk of nc-Si:H grown material. A nc-Si:H layer with high defect density reduces the voltage and the fill factor (FF) of the tandem device. In order to minimize the defect density in the nc-Si:H absorber layer, different texturing approaches (TA) were developed for the c-Siwafer to facilitate better growth of the nc-Si:H absorber. The surface morphology of the textured c-Si wafers for all TA’s at different etching time steps were investigated. Prior to TF layer deposition for the SHJ and the tandem devices, various cleaning approaches were investigated to improve the surface passivation of the textured c-Si wafers. The investigation of the grown nc-Si:H layer using different TA’s showed that smoothening of the sharp pyramidal structures significantly improved the nc-Si:H grown bulk as it helped in better growth of nc-Si:H with no significant defects. Finally, the current density-voltage (J-V) measurements were investigated for all TA’s for the SHJ and the tandem devices. The best performing tandem cell has an open circuit voltage (Voc ) of 1.02 V , short current density (Jsc ) of 13.34 mA/cm-2 and a FF of 0.44. It is expected that optimizing the tunnel recombination junction (TRJ) will further improve the electrical performance of the tandem devices for all TA’s.Electrical Engineering | Sustainable Energy Technolog
An approach to nano-chemical analysis through NC-AFM technique
Full text linkWe have measured the NC-AFM frequency shift dependence on the X-ray energy around the Au L3 absorption edge energy. We found a peak in the frequency shift just above the Au region at the Au L3 absorption edge energy while we could not detect any peak in the frequency shift when the NC-AFM tip was placed above the Si regions. This novel phenomenon indicated that the combination of energy-variable X-rays and NC-AFM provides us a new way to nano level chemical mapping at surface. We briefly discussed some possible mechanisms
A phased city energy platform for networked precinct buildings in the context of management information systems and smart grids
Full text linkThis research investigates the context and advantages of energy sharing between networked precinct buildings in the context of pre-existing urban stock. The paper considers whether the sharing of patterns of use and knowledge of buildings’ spatial, architectural and energyrelated components can act as a phased prequel to energy sharing and provide a ‘knowledge pool’ to facilitate changes to the technological mix in a building, as well as modes of usage. In the context of energy use and conservation it is well understood that resource sharing can be advantageous across multiple buildings, but less is known about the potential benefits of energy knowledge sharing across buildings. The sharing of energy data across buildings with different owners/operators but offers the advantages of balancing demand across facilities, right-sizing technology components, intelligent planning and future usage pooling – particularly for smart buildings with energy storage and generation capacity. With a focus on the Australian context, this research investigation examines how an initial energy information platform phase could benefit a range of building stakeholders and be lead to a subsequent energy sharing phase. The author argues that there is value in a city energy information platform as a prequel to smart grids and subsequently as a complement to smart grids
Investigation of silicon NC memory with improved threshold voltage window
No full textMemory capacitors with the structure of thin tunneling oxide layer/silicon nanocrystal (NC) layer/thick controlling oxide layer were fabricated by both LPCVD method and low energy ion implantation method. The silicon NC formation condition, its size and density which have great influence on silicon NC memory characteristics are experimentally investigated in this paper. Silicon NC memory with a 2V threshold voltage window was obtained by optimized silicon ion implantation technology, which is beneficial to the practical application of the silicon NC memory device.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000259893500133&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Engineering, Electrical & ElectronicNanoscience & NanotechnologyEICPCI-S(ISTP)
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