1,721,080 research outputs found
Flow Field and Plasma Reaction with Precursor Zinc Nitrate in a PECVD System
No full text本文建立數值模型以分析PECVD製程中鍍膜區域流場結構變化以及噴頭內部電漿反應，包含許多物質且相互產生不同的化學反應，利用商用套裝軟體COMSOL Multiphysics5.2進行數值模型，使用紊流模型、熱傳模型、化學模型三種模型耦合進行計算。 首先常壓電漿外部流場模型可了解受氣流結構影響後的物種分布，並且應用於設計線型常壓電漿的抽氣系統。由常壓氮氣電漿噴流下游模型進行數值模擬，此模擬結果與實驗相符，皆在間距1 mm時放光強度突增，證明此熱流場模型耦合化學模型可用來模擬氮氣電漿反應。最後以電漿內部反應模型引入電子能量、電子密度函數，由可量測得電壓值及施加電功率與作為模型參數，模擬結果與實驗所量測得出口溫度做比較，在定性上有相同的趨勢。此模型可預測電漿頭內部的激發態物種量值、前驅物硝酸鋅熱分解形成氧化鋅以及內部混合氣體溫度分布。This study is a numerical simulation of the flow field on the deposition region and the atmospheric pressure plasma jet (APPJ) in the PECVD manufacturing process. The plasma reaction includes mutually species and different chemical reactions. When doing simulation, we utilized commercial software COMSOL Multiphysic5.2. The turbulent model is coupled with heat transfer model and chemical model. At first we analysis the configuration of flow field effect on the deposition region in the PECVD process. This model could apply on designing a system to collect the by-production for linear atmosphere pressure plasma. In continue, to verify the plasma reaction model, contrast the experimental result with simulation result. Establishing an APPJ model to simulate the downstream of fluent .The simulation result is consistence with the experiment. The visual light sudden expansion which occur at the gap is 1 mm. It could be proof this model is feasible. In the last model, we defined the specific function of electron temperature and electron density which was add measured voltage and applied power be model parameters. We compared the simulation results with experimental results, and found qualitatively similar in outlet temperature. This model could predict the excited species concentration, zinc nitrate precursor thermal decomposed to form zinc oxide and temperature distribution of mixing gas
‘Employment Security’, ‘Workplace Justice’ and Employees’ Burnout: Reliability and Validity of the Questionnaire Instrument and Results from a Survey
No full text近年來國外流行病學研究指出，工作職場中「工作缺乏保障」與「組織正義」低落，乃是工作壓力疾病的危險因子。追蹤性研究指出，「工作缺乏保障」本身即為一個慢性壓力來源(Ferrie et al., 2002)。缺乏保障的工作較易出現在低技術與低階層的族群，由於這些族群的工作性質可能較具有風險、勞動條件較差，進而也有較高的職業傷害與意外(Benach, 2000; Benavides et al., 2006)。且「工作缺乏保障」者在職場特質上有較高的工作負荷與工作壓力，工作控制低，這些不利的工作情境可能會惡化工作者的健康(Fenwick & Tausig, 1994; Kristensen et al., 2002; Cheng et al., 2005)。職場中，感受「組織正義」低落的工作者與負向的情緒感受、睡眠問題、心理憂傷、罹患輕微精神疾病、病假與自評健康狀況不佳等方面有顯著關聯(Weiss & Suckow, 1999; Elovainio et al., 2001 & 2002; Kivimaki et al., 2003)。關研究以歐美國家為多，且多數僅以單題調查「工作缺乏保障」。而台灣的研究相對較為缺乏，又台灣的勞動市場特性較為特殊，產業結構以中小企業為多數，勞僱關係可能較不穩固，且近幾年來工作越來越沒有保障，職場中的管理制度，也可能對工作者的身心健康造成影響。勞委會於2007年對工作者的安全衛生與健康狀況調查新加入「就業缺乏保障」與「職場正義」面向，希冀能瞭解國內的相關分佈狀況與對工作者的影響。由於使用的「就業缺乏保障」與「職場正義」量表僅參考相關文獻後研製，未進行前驅性研究，故本研究於事後檢驗「就業缺乏保障」與「職場正義」量表的信效度。 本研究目的有四：首先，評估「就業缺乏保障」與「職場正義」量表之信效度；第二，瞭解受僱者族群中「就業缺乏保障」的盛行情形與社會分佈狀況；第三，分析「就業缺乏保障」在不同社會人口族群的分佈差異，並探討缺乏保障的工作之職場社會心理特質，如「職場正義」、「工作控制」、「工作負荷」等；第四，分析「就業缺乏保障」與受僱者疲勞狀況的相關性。究方法包含量性問卷調查與質性問卷訪談兩種。量性資料來源是行政院主計處與勞工委員會勞工安全衛生研究所於2007年9月所辦理的「工作環境安全衛生狀況認知調查」之受訪者，採分層隨機抽樣方式，以取得全國代表性樣本；以受訪者自填問卷的方式進行資料收集，從調查對象中擷取25歲~65歲的受僱工作者進行資料分析，人數總計為17,042。為評估「就業缺乏保障」與「職場正義」量表之信效度，本研究也進行個案質性問卷訪談，以瞭解受訪者如何回應問卷題目，受訪對象是依照性別、教育程度與年齡的目的性條件取樣，總共訪談10位25歲~65歲的受僱工作者。果發現，「就業缺乏保障」與「職場正義」量表內部一致性佳(Cronbach’s alpha值皆在0.76以上)，信度良好；然而在建構效度方面，負向題未歸屬於同一因素中，效度結果較不理想；且質性訪談亦發現部分題目的缺失。全國受僱者調查結果發現，國中以下教育程度、藍領職等、任職於100人以下中小企業、從事電力燃氣或營造業，屬於約聘雇、臨時性、短期性、季節性契約一類與無底薪的受僱者，「就業缺乏保障」較嚴重。處於「就業缺乏保障」的工作者，「職場正義」低落、工作控制低、心理負荷大，且工作壓力大與工作不滿意的情形也較高。最後，多變項回歸分析發現，「就業缺乏保障」與「職場正義」較低的受僱工作者，疲勞程度較嚴重。研究結果指出，低社經階層的工作者「就業缺乏保障」較嚴重，且伴隨著較不利的職場特質，對職業健康有負面影響。誌 謝 I 要 IIbstract IV 錄 VII圖目次 VIII一章 緒 論 1二章 文獻探討 4一節「就業保障」的理論、概念與測量 4二節「就業保障」對工作者健康之影響：致病機制與流行病學文獻回顧 5三節「職場正義」的理論、概念與測量 14四節「職場正義」對工作者健康之影響：致病機制與流行病學文獻回顧 20五節 研究重要性 22三章 「就業缺乏保障」與「職場正義」問卷量表之信效度分析 24一節 前 言 24二節 材料與方法 26三節 結 果 30四節 討 論 53四章 「就業缺乏保障」對職場社會心理特質與受僱者疲勞之影響 58一節 前 言 58二節 材料與方法 60三節 結 果 65四節 討 論 90五章 結論與建議 95考文獻 98錄一 104僱者『就業缺乏保障』與『職場正義』問卷之質性訪談研究紀錄表 104與研究同意書 107錄二 2007年採用的問卷調查項目內容 108錄三 表 格 11
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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