58 research outputs found
A Comparative Study on the Impact of Critical Thinking and Rote Memorization on End-of-Science Test Scores of Fifth Grade Students in Science in Egypt: Implications for Educational Leaders, 2019
No full textThe main objective of this study was to understand whether critical thinking teaching strategies or rote memorization teaching strategies produce better end-of-science test scores of fifth-grade students or not in a school in Egypt. To achieve this goal, the researcher used a pretest, posttest, and quasi-experimental design. Two classrooms—one using rote memorization teaching strategies and the other using critical thinking teaching strategies based on Bloom’s Taxonomy—were used for the study. The researcher described these tools as follows: a pre and post cognitive information test, questionnaires, and a purposed teaching program. The statistical analysis was carried out with the purpose of answering the research questions and led to the following results: There were no statistically significant variations between the critical thinking group and the rote memorization group as shown in the pretest stage indicating inadequate mean scores. Upon administration of the experiment, results indicated a statistic difference between the critical thinking group and the rote memorization group after administration of the test. The mean difference between the two groups was substantial and notable. The study also found minimal difference between the pretest and posttest rote memorization groups which shows that rote memorization is ineffective in contributing to memory and application of acquired knowledge. Critical thinking has been applauded in its role to enhance performance among students which was demonstrated in the study with substantial difference between the pretest and posttest critical thinking group. Additionally, the study was particularly significant in showing the importance of using critical thinking strategies to improve science course outcomes among fifth graders. Moreover, the study provided new insight on the impact of socioeconomic status on end-of-science test scores. The relationship between socioeconomic and science test scores can be attributed to such variables as interest in science, opportunities to education and cognitive factors. There is also a relationship between fifth grade students/teachers interactions (after classroom intervention) and end-of-science test scores in the critical thinking group
Decision-making in Diagnosing Heart Failure Problems Using Dual Hesitant Fuzzy Sets
No full textIn recent decades, several types of sets, such as fuzzy sets, interval-valued fuzzy sets, intuitionistic fuzzy sets, interval-valued intuitionistic fuzzy sets, type 2 fuzzy sets, type n fuzzy sets, and hesitant fuzzy sets, have been introduced and investigated widely. In this paper, we propose dual hesitant fuzzy sets (DHFSs), which encompass fuzzy sets, intuitionistic fuzzy sets, hesitant fuzzy sets, and fuzzy multi-sets as special cases. Then we investigate the basic operations and properties of DHFSs. We also discuss the relationships among the sets mentioned above, and then propose an extension principle of DHFSs. Additionally, we give an example to illustrate the application of DHFSs in Diagnosing Heart Failure Problems which is explained in details and puts new view of some operations of DHFS
New Operation Defined over Dual-Hesitant Fuzzy Set and Its Application in diagnostics in medicine
No full textIn recent decades, several types of sets, such as fuzzy sets, interval-valued fuzzy sets, intuitionistic fuzzy sets, interval-valued intuitionistic fuzzy sets, type 2 fuzzy sets, type n fuzzy sets, and hesitant fuzzy sets, have been introduced and investigated widely. In this paper, we propose dual hesitant fuzzy sets (DHFSs), which encompass fuzzy sets, intuitionistic fuzzy sets, hesitant fuzzy sets, and fuzzy multi-sets as special cases. Then we investigate the basic operations and properties of DHFSs. We also discuss the relationships among the sets mentioned above, and then propose an extension principle of DHFSs. Additionally, we give an example to illustrate the application of DHFSs in diagnostics in medicine which is explained in details and puts new view of some operations of DHFS
Quasi-orbital angular momentum for microwave communications
No full textThe increasing demands of current and future communications, have made it imperative on the telecommunications industry, and research community, to continue extending on their innovative capabilities and knowledge. With most of society's communications occupying the microwave domain, the issues of spectral congestion, channel capacity limitations and security, remain a top priority.
Orbital Angular Momentum (OAM), as a fundamental property of all electromagnetic (EM) fields was first discovered, and studied by the physics community in the 1990s. These studies were mainly within the optical range of the spectrum, and only recently has OAM been introduced to the microwave domain for communications. OAM is associated with a helical phase profile to the radiation pattern, where its number of 2_ rotations, are dependent on the OAM mode number. Electromagnetic microwaves carrying different OAM modes, are said to be orthogonal to one another, allowing multiple channels on the same frequency. Hence; a promising candidate for addressing spectral congestion. It also has natural anti-interference and anti-jam capabilities, due to their theoretically infinite mode diversity.
The realisation of OAM within the microwave domain, however, has its own unique challenges, seperate to those in optics. These challenges include, but not limited to, significant radiation pattern divergence, the need of multiple, or large apertures to appreciate OAM's diverse mode capabilities, and limitations on aperture circumference. This inevitably deems it difficult to realise a practical OAM communications system, exploiting OAM's mode diversities and capabilities for transforming microwave communications. Realising the capabilities of OAM however, and potential in innovating the telecommunications industry, the author looked to address some of those limitations within the microwave frequency domain in this thesis. The three main original contributions to knowledge, made to further the BoK on OAM in microwaves, will be discussed and presented in this thesis, are summarized below.
The first original contribution to knowledge, by the author, investigates the capability of inducing OAM with Quasi-Circular Apertures. The proposed Quasi-Circular Array Antennas are in the form of partial circular arrays, in contrast to full conventional circular arrays used to generate OAM carrying radiation patterns. These Quasi-Circular Array Antenna apertures proved that OAM can be generated by only a partial circular aperture (significantly smaller array apertures), whilst generating Quasi-OAM radiation patterns with more gain, and directivity.
The second original contribution to knowledge, by the author, investigates the theoretical limitations on the circumference of partial apertures in relation to the resulting OAM mode power. To further reduce the aperture size of the Quasi-Circular Arrays for compactness and practicality in OAM-based communication systems, the author proposes a method to augment the OAM mode power, whilst using a Quasi-Circular Array Antenna aperture of circumference, less than the theoretical limit of π.
The third original contribution contribution to knowledge, by the author, investigates the robustness of Quasi-OAM radiation patterns in comparison to conventional OAM, using Bit- Error-Rate (BER) measurements to benchmark the performance of each aperture. The proposed Quasi-Circular Array Antenna aperture is then tested for performance in the presence and absence of OAM mode cross-talk. This is to verify the Quasi-OAM mode orthogonality using the proposed Quasi-Circular Array Antenna aperture, for OAM-based communications. This resulted in a proposed Quasi-OAM based communication system, where the robustness of Quasi-OAM radiation patterns proved to be better than conventional OAM radiation patterns in the absence of mode cross-talk, and very similar in the presence of cross-talk.
In contrast to conventional OAM-based communication systems in the microwave domain, the proposed Quasi-OAM based communication system, Quasi-Circular Array Antennas, and the ability to augment the OAM power with much smaller apertures, is envisioned to innovate current OAM-based communication systems. This is whilst exploiting the additional benefits of Quasi-Circular Array Antenna apertures and Quasi-OAM radiation patterns, alongside the existing benefits of OAM, as demonstrated in this thesis. These benefits are also envisioned to extend outside the telecommunications domain, where OAM is currently being explored
Formation of Jomo Kenyatta as a Politician. The First Years of the Presidency
No full textThe purpose of the article is to trace the formation of Jomo Kenyatta as a politician who led the anti-colonial struggle in Kenya, to identify the problems he faced during this struggle, as well as methods of solving them, to analyze the social and political activities of the African leader as President of Kenya, the reasons for the emergence of opposition within the country, as well as foreign policy activities.
Considering that the factual part of Kenyatta’s biography has been fairly well studied, the author simultaneously set the task of comparing the approaches of Russian and foreign (mainly British) researchers in assessing his activities in different years. The relevance of the topic lies in the fact that in many countries of the African continent the memory of the leaders of the period of liberation is still an important instrument of national solidarity. This fully applies to Kenya, where Jomo Kenyatta, in the memory of all segments of the population, is still the “father of the nation”, one of the symbols uniting the people of Kenya, despite the fact that his role in the life of the country is assessed ambiguously
Amblyseiella setosa Muma
No full textAmblyseiella setosa Muma Amblyseiella setosa Muma, 1955: 266; Papadoulis et al., 2009: 65; Ferragut et al., 2010: 108. Amblyseius denmarki El-Borolossy, in Nasr & Abou-Awad, 1985: 245; Zaher, 1986: 103. (synonymy by Chant & McMurtry, 2007: 191). Amblyseiella denmarki. — Chant & McMurtry, 2004: 187; 2007: 71; Moraes et al., 2004: 9. Amblyseius rusticanus Athias-Henriot, 1960 a: 292; Muma et al., 1970: 54. (synonymy by Chant & McMurtry, 2004: 187; 2007: 73; Denmark & Evans, 2011: 55). Female (holotype and one paratype of A. denmarki). Dorsal shield mostly smooth, with striae anterolaterad of s 4; 437 [450] long and 250 [252] wide, with 16 pairs of setae. Setae j 1 39 [39], j 3 61 [65], j 4 3 [3], j 5 4 [5], j 6 5 [8], J 2 5 [8], J 5 8 [8], z 2 33 [33], z 4 83 [83], z 5 3 [5], Z 1 8 [8]; Z 4 86 [86]; Z 5 101 [101], s 4 109 [112], S 2 66 [68], S 4 40 [49], r 3 22 [22], R 1 39 [39]. All setae smooth, except Z 4 and Z 5, faintly serrate. Peritreme extending forward to level of j 1. Venter. Sternal shield smooth, with three pairs of setae and two pairs of lyrifissures. Distances between st 1 -st 1 75 [75], st 2 -st 2 75 [78], st 3 -st 3 92 [92], st 4 -st 4 94 [101]. Genital shield smooth, with lateral extensions; distance between st 5 -st 5 85 [87]. Ventrianal shield pentagonal, smooth; 127 [127] long, 73 [78] wide at level of ZV 2 and 99 [99] wide at level of anus; with one pair of pre-anal setae and a pair of pores. Seta JV 5 91 [94]. Ventral setae smooth. Two pairs of metapodal plates. Spermatheca. Calyx of spermatheca bell-shaped, 16 [16] long; atrium distinct. Gnathosoma. Corniculi slightly convergent distally; basal width of corniculus 5, distance between bases of corniculi 8. Movable cheliceral digit 38 [38], with 1 [1] tooth; fixed digit 37 [38] long, with 3 [3] teeth. Legs. Macrosetae sharp-tipped: Sge II 39 [39], Sge III 60 [60], Sge IV 96 [101], Sti IV 68 [68], St IV 75 [75]; chaetotaxy of genu II 2, 2/ 1, 2 / 0, 1; genu III 1, 2/ 1, 2 / 0, 1. Specimens examined. Holotype female from mango leaves, at Ismailia governorate, April 1978; one paratype female from citrus leaves, at Gharbia governorate, November 1978 (coll. M.A. El-Borolossy). Previous records from Egypt. Gharbia, Ismailia and Qualyubia governorates (Zaher, 1986); unspecified governorate (Nasr & Abou-Awad, 1985). Remarks. Chant & McMurtry (2004) stated that A. setosa was probably a senior synonym of A. denmarki. On page 71 of Chant & McMurtry (2007) both of those names were used, suggesting that they could be distinct from each other; however, on page 73 they mentioned that an examination of the types indicated that they could be synonyms, and on page 191 of the same publication, they were considered synonyms, as concluded after an examination of the type specimens. Amblyseiella setosa was originally described from the holotype female, five paratype females and two paratype males collected in the USA. The original description was reasonably detailed, including illustrations, but provided only measurements of the idiosoma. According to Nasr & Abou-Awad (1985), A. denmarki was first described in an unpublished MSc thesis (El- Borolossy, 1979). Nasr & Abou-Awad (1985) mentioned the name of this species (indicating El-Borollosy as the author) in a key to the Egyptian Amblyseius. That constitutes the original description of the species, despite the fact that no information was then provided about the type specimens. Zaher (1986) provided a detailed redescription of the species, with illustrations and setal measurements, mistakenly mentioning Zaher & El-Borollosy [sic] as the authors. Measurements of the females examined are close to those reported by Zaher (1986) for a single female, except the longer and wider dorsal shield (500 and 330, respectively, according to that author). Measurements of specimens examined fit the corresponding ranges given by Ferragut et al. (2010).Published as part of Abo-Shnaf, Reham I. A. & De, Gilberto J., 2014, Phytoseiid mites (Acari: Phytoseiidae) from Egypt, with new records, descriptions of new species, and a key to species, pp. 1-71 in Zootaxa 3865 (1) on page 6, DOI: 10.11646/zootaxa.3865.1.1, http://zenodo.org/record/28714
Geological Modeling and Reservoir Characterization of the World's Largest Field: Greater Burgan
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WITHDRAWN: Anti-inflammatory and antinociceptive activities of extracts and compounds isolated from Solenostemma arghel (Del.) Hayne
No full textThis article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy
Effect of Core Stability Exercises and Treadmill Training on Balance in Children with Down Syndrome: Randomized Controlled Trial
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