1,721,222 research outputs found
Printed (2x1) patch array antenna at 2.45 GHz / Sumayah Ilias
No full textThis paper proposed of a microstrip rectangular patch array antenna with operating frequency at 2.45GHz for WLAN application. The antenna array of 2x1 microstrip rectangular patch antenna with microstrip line feeding based on quarter-wave impedance matching technique was designed and simulated using CST Microwave Environment software. The performance of the designed antenna was analyzed in term of return loss, VSWR, bandwidth, directivity, radiation pattern and gain. The antenna was then fabricated on the substrate type FR-4 with dielectric constant of 4.7 and thickness of 1.6mm respectively. The antenna was measured using Vector Network Analyzer (VNA) and the details of the proposed antenna design and simulation result for 2.45GHz WLAN band are promising. The return loss, si 1 for the single patch antenna and (2x1) array antenna are -12.938 and -19.468 respectively. Other than that, the simulated bandwidth for the single patch antenna is 3.82%. Meanwhile for the (2x1) array antenna is 3.98%.This is proved that (2x1) array antenna is better than single patch antenna in term of wider bandwidth, higher gain and better directivity
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
Printed (2x1) patch array antenna at 2.45GHz / Sumayah Ilias and Aiza Mahyuni Mozi
Full text linkThis paper proposed of a microstrip rectangular patch array antenna with operating frequency at 2.45GHz for WLAN application. The antenna array of 2x1 microstrip rectangular patch antenna with microstrip line feeding based on quarter-wave impedance matching technique was designed and simulated using CST Microwave Environment software. The performance of the designed antenna was analyzed in term of return loss, VSWR, bandwidth, directivity, radiation pattern and gain. The antenna was then fabricated on the substrate type FR- 4 with dielectric constant of 4.7 and thickness of 1.6mm respectively. The antenna was measured using Vector Network Analyzer (VN A) and the details of the proposed antenna design and simulation result for 2.45GHz WLAN band are promising. The return loss, sll for the single patch antenna and (2x1) array antenna are -12.938 and - 19.468 respectively. Other than that, the simulated bandwidth for the single patch antenna is 3.82%. Meanwhile for the (2x1) array antenna is 3.98%.This is proved that (2x1) array antenna is better than single patch antenna in term of wider bandwidth, higher gain and better directivity
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
Nanotechnology approach for targeted treatment of triple negative breast cancer
No full textBreast cancer is one of the most devastating diseases worldwide. Triple negative breast cancer cells (TNBCs) are defined by the lack of progesterone receptor (PR), estrogen receptor (ER), and epidermal growth factor receptor 2 (EGFR2) expressions. TNBCs account for 10%- 20% of all breast carcinomas. The study is aimed at examining the efficacy of gefitinib and EGFR-targeted siRNA delivered by liposomes for treating triple negative breast cancer (TNBC). The experiments were carried out using two types of human breast cancer (BC) cell lines MCF-7 (estrogen positive BC, EPBC) and MDA-MB 231(TNBC). EGFR-targeted siRNA and gefitinib were delivered by cationic and neutral liposomes, respectively. A fluorescence microscope was used to study cellular internalization of labeled liposomes and siRNA. The expression of the targeted mRNA was performed using quantitative reverse transcription PCR. Finally, cytotoxicity of liposomal siRNA and gefitinib alone or in combination was measured using the modified MTT assay with appropriate controls. It was found that liposomes effectively delivered siRNA into both types of BC cells and suppressed the expression of targeted EGFR mRNA. However, formulations without gefitinib did not influence significantly on the viability of BC cells. Free drug demonstrated the ability to kill both types of cancer cells. Nevertheless, toxicity of gefitinib in TNBC was 2.5 times lower when compared with EPBC cells. The delivery of the drug by liposomes significantly enhanced its toxicity (1.2 and 2.5 times in EPBC and TNBC, respectively). The combination of liposomal siRNA and liposomal gefitinib demonstrated exceptionally high cytotoxicity when compared with the free drug (143 and 62 times higher in EPBC and TNBC, respectively). Suppression of EGFR mRNA effectively suppressed resistance of TNBC cells to gefitinib. The data obtained support the proposed approach and showed high potential of liposomal EGFR siRNA in combination with liposomal gefitinib in treatment of TNBC.M.S.Includes bibliographical referencesby Sumayah Abed Ahmed Al-Mahmoo
- …
