102,203 research outputs found
Design and Analysis of Compact Self-Multiplexing Antenna Based on Half-Mode Substrate-Integrated Circular and Rectangular Cavities
No full textThis paper presents the design and analysis of a compact self-multiplexing antenna (SMA) for pentaband applications. The proposed antenna is built using half-mode (HM) substrate-integrated circular and rectangular cavities loaded with slots. The HM circular cavity is excited through three 50Ω microstrip lines, which facilitate three distinct frequency bands. In contrast, the HM rectangular cavity is activated using two 50Ω coaxial probes, yielding two different operating frequencies. Thus, the proposed SMA operates at 3.91 GHz (5 G band), 4.4 GHz (5 G band), 4.99 GHz (5 G band), 5.83 GHz (WLAN/WiMAX), and 6.59 GHz (Extended C -band). The radiation process, operating principle, and frequency tunability are explored in depth. The proposed SMA features a compact footprint area of 0.43 λg2 and attains an isolation level exceeding 24.5 dB. The antenna achieves realized gains of 3.46 dBi, 3.23 dBi, 3.44 dBi, 5.19 dBi, and 4.23 dBi, along with efficiencies exceeding 82%, 87%, 92%, 71%, and 90 % at frequencies of 3.91 GHz, 4.4 GHz, 4.99 GHz, 5.83 GHz, and 6.59 GHz, respectively
FIGURE 3 in Anemone pindariensis sp. nov., a new species from Pindari valley of the Western Himalaya, India
No full textFIGURE 3. Anemone pindariensis: A.; B. Flower; D. Sepal; E. Abaxial side of the sepal; F. Adaxial side of the sepal; I. Staminodes; J. Densely hairy filaments of the stamens; K. Stamens; M. Carpels. Anemone rivularis: C. Flower; G.; H. Sepal; L. Stamen.Published as part of Singh, Harsh & Barik, S.K., 2021, Anemone pindariensis sp. nov., a new species from Pindari valley of the Western Himalaya, India, pp. 289-295 in Phytotaxa 516 (3) on page 292, DOI: 10.11646/phytotaxa.516.3.8, http://zenodo.org/record/537193
The corrosion of nickel–aluminium bronze in seawater [in A Century of Tafel’s Equation: A Commemorative Issue of Corrosion Science]
No full textNickel–aluminium bronze (NAB) alloys show good corrosion resistance under marine conditions. The corrosion behaviour of cast and wrought NAB alloys is illustrated in this work through a range of electrochemical techniques including open-circuit potentiometry with time, oxygen reduction voltammetry, NAB dissolution voltammetry, potential step (or flow step) current transients and linear polarisation resistance. The galvanic coupling of NAB to stainless steel or copper is examined by zero resistance ammetery. The importance of using controlled flow working electrodes is illustrated by the use of a rotating disc electrode, a rotating cylinder electrode and a bimetallic (NAB/copper–nickel) rotating cylinder electrode. In addition to controlling the hydrodynamics, such electrodes allow charge transfer data to separate from those of mass transport control under mixed kinetic control. Longer term seawater immersion trials on planar coupons coupled to titanium or cupronickel are also reported. The relative contributions of erosion and corrosion attack are considered using a wall-jet electrode and the corrosion characteristics of NAB are compared to those of copper and copper–nickel in chloride media
Results on Laplacian spectra of graphs with pockets
No full textLet F , H v be simple connected graphs on n and m + 1 vertices, respectively. Let v be a specified vertex of H v and u 1 , … , u k ∈ F . Then the graph G = G [ F , u 1 , … , u k , H v ] obtained by taking one copy of F and k copies of H v , and then attaching the i th copy of H v to the vertex u i , i = 1 , … , k , at the vertex v of H v (identify u i with the vertex v of the i th copy) is called a graph with k pockets. In 2008, Barik raised the question that ‘how far can the Laplacian spectrum of G be described by using the Laplacian spectra of F and H v ?’ and discussed the case when deg ( v ) = m in H v . In this article, we study the problem for more general cases and describe the Laplacian spectrum. As an application, we construct new nonisomorphic Laplacian cospectral graphs from the known ones. Keywords: Laplacian matrix, Laplacian spectrum, Join, Pocket
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
Unicyclic graphs with strong reciprocal eigenvalue property
No full textA graph G is bipartite if and only if the negative of each eigenvalue of G is also an eigenvalue of G. It is said that a graph has property (R), if G is nonsingular and the reciprocal of each of its eigenvalues is also an eigenvalue. Further, if the multiplicity of an eigenvalue equals that of its reciprocal, the graph is said to have property (SR). The trees with property (SR) have been recently characterized by Barik, Pati and Sarma. Barik, Neumann and Pati have shown that for trees the two properties are, in fact, equivalent. In this paper, the structure of a unicyclic graph with property (SR) is studied. It has been shown that such a graph is bipartite and is a corona (unless it has girth four). In the case it is not a corona, it is shown that the graph can have one of the three specified structures. Families of unicyclic graphs with property (SR) having each of these specific structures are provided
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
FIGURE 2 in A new species of Aconitum (Ranunculaceae) from Indian Eastern Himalayan state of Sikkim
No full textFIGURE 2. Aconitum sikkimensis: A. Habitat; B. Flowers; C. Leaves; D. Inflorescence; Aconitum hookeri: E, F. Habitat; G, H. Flowers.Published as part of Singh, Harsh, Pradhan, Aditya, Adhikari, Dibyendu, Chettri, Arun & Barik, Saroj Kanta, 2021, A new species of Aconitum (Ranunculaceae) from Indian Eastern Himalayan state of Sikkim, pp. 207-216 in Phytotaxa 484 (2) on page 210, DOI: 10.11646/phytotaxa.484.2.5, http://zenodo.org/record/542159
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3346: Samuel G. Freedman, author, 2013
No full textPhotograph of author Samuel G. Freedman, at NT Daily Slash meeting in the Mayborn School of Journalism at UNT
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