1,721,270 research outputs found
Interference effect on Goos-Hänchen shifts of anisotropic medium interface
No full textWe present a comprehensive analysis of the anomalous Goos-Hanchen (GH) displacement that occurs during the reflection of light beams at an interface between air and an anisotropic medium. This analysis also applies to the Imbert-Fedorov effect. Our study suggests that the anomalous GH displacement is primarily caused by polarization-dependent abnormal interference effects between the direct and cross-reflected light fields. Using the interface between air and a type II Weyl semimetal as an example, we provide a clear physical explanation for the relationship between spin-dependent abnormal interference effects and anomalous GH displacement. We demonstrate that spin-dependent constructive interference leads to a reduction in the GH displacement of the total reflected light field, while spin-dependent destructive interference results in an increase in the GH displacement of the total reflected light field
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
Coherent interaction between superconducting qubits and photons in circuit quantum electrodynamics
No full text本論文研究在晶片上兩個超導transmon量子位元與微波共振腔之間的交互作用。每一個transmon包含了可以被磁通量調控的約瑟芬接合以及用指叉式電容來降低transmon 的等效充電能 (charging energy)，如此可以抑制由電荷擾動所造成的雜訊。本實驗的微波共振腔是半波長共平面波導，共振頻率為5.96GHz，選擇材料為鈮(Niobium)。沒有外加磁場，transmon 的躍遷頻率分別為10.1GHz 和9.3GHz。Transmon的躍遷頻率可以被磁場調控到和微波共振腔的共振頻率相同。在本實驗中，當transmon和微波共振腔之間零失調(zero detuning)時，觀察到反交叉(anti-crossing)現象，這證明了量子位元和共振腔之間有同調性的交互作用。利用Jaynse-Cummings model來擬合共振腔共振頻率附近的反交叉現象，發現量子位元與共振腔之間的耦合強度(coupling strength)分別為165MHz和160MHz。根據以上擬合，在兩量子位元之間零失調時，也有觀察到反交叉現象，這起因於兩量子位元的交互作用產生的糾纏現象。Coherent interaction between two superconducting transmon qubits and an on-chip microwave cavity is studied. Each transmon consists a flux-tuned Josephson junction and a shunting multi-finger capacitor, which is for reducing the effective charging energy of the transmon so as to suppress the noise induced by the charge fluctuation. Our microwave cavity is a half-wavelength coplanar waveguide made of Nb with resonance frequency of 5.96GHz. With no flux bias, the transition frequencies of each transmon are 10.1GHz and 9.3GHz respectively. They can be tuned to meet the cavity resonance frequency by increasing the flux bias. In our experiment, anticrossing features appear around qubit-cavity zero detuning points, showing the coherent interaction between qubits and the cavity. By fitting the anticrossing features around the cavity resonance with the Jaynse-Cummings model, the qubit-cavity coupling strengths of the two transmons are estimated to be 165MHz and 160MHz, respectively. According to this information, we also located the qubit-qubit zero detuning points, where another anticrossing features are shown. They are corresponding to the entanglement of the two transmons due to the effective qubit-qubit interaction
Seismic Test and Finite Element Analyses of a Steel Full-Scale Two-Story Dual-Core Self-Centering Braced Frame
No full text雙核心自復位斜撐在斜撐試驗中已證明擁有量好的自復位能力，並且有一套能夠準確預測斜撐軸向行為的理論。本研究首次將兩支雙核心自復位斜撐同時使用於二層樓構架中進行耐震試驗，在經過7次試驗之後，雙核心自復位斜撐構架無任何損壞，過程中梁端部也無發生局部挫屈現象。且各階段試驗結束後構架最大殘餘變形也僅有試體總高的0.15 %，自復位行為非常良好。本研究也使用了有限元素分析軟體ABAQUS對試驗試體進行有限元素分析比較，分析結果顯示構架最大力量與試驗僅有約5 %的差距，殘餘變形與試驗有約10 %的差距，其位移不到樓層總高的0.01 %，表示有限元素模型能夠準確地對雙核心自復位斜撐構架進行模擬。Dual-Core Self-Centering Brace (DC-SCB) in past tests has proved have good Self-Centering capability, and a theory can accurately predict axial behavior. For the first time, This study use two DC-SCBs in a two-story frame to do the test. During 7 tests, DC-SCBF has no failure, beam end did not buckle. Maximum residual deformation of 7 tests is 0.15% of 2nd floor drift. This study also use finite element program ABAQUS to do finite element analyses for the specimen. Analyses result shows about 5% error in maximum force and 10% error in residual deformation from the test. ABAQUS model can accurately simulate DC-SCB behaviors
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