204,312 research outputs found
Solving Singular Boundary Value Problems Using Daftardar-Jafari Method
Get PDFIn this paper, we apply the suggested iterative method by Daftardar and Jafari hereafter called Daftardar-Jafari method for solving singular boundary value problems. In the implementation of this new method, one does not need the computation of the derivative of the so-called Adomian polynomials. The method is quite efficient and is practically well suited for use in these problems. Two illustrative examples has been presented
Leopoldia tijtijensis Jafari. 2012, sp. nov.
No full textLeopoldia tijtijensis Jafari., sp. nov. Fig. 1 Leopoldia tenuiflorae (Tausch) Heldr affinis racemus densus, cylindrico-conici nec laxus cylindricus, flores fertiles oblongo-urceolati nec tubularo-urceolati, purpureo-violati nec olivaceus flores sterilibus purpureus nec violacea. Capsula triangulares nec cordato-ovoidea differt. Type:— IRAN. Kurdistan: Sanandaj to Marivan road, Tijtij, Tijtij hills, 1650 m, 2 May 2010. Jafari, Dezyanian & Kaffash. 110. (Holo: IAUM, Iso: TARI). Bulbs c.5–6× 4–5 cm, ovoid with greyish cream tunics. Leaves 5–13 in number, c.20–40 × 1.7–2 cm, strap shaped, weakly canaliculated, attenuate with scabrous margins, shorter or longer than raceme. Scape 1, c. 23– 30 cm long. Raceme c.10–15× 2.5–5 cm, dense, cylindrical-conical, rachis violet. Pedicel of fertile flowers deflexed or ascending, c. 0.8–1.5 cm, violet. Fertile flowers 60–70 in number, c. 4.5–5 mm × 1–1.2, oblongurceolate, round shoulder, purple-violet in fresh and pale brown in dried flowers; lobes c. 0.5 mm ascending, weakly deflexed, black. Pedicel of sterile flowers c. 3–5 mm. Sterile flowers 12–20 in number, c. 2–3 mm, same length or shorter than pedicel, ascending, purple, triangular-campanulate. Capsule triangular, c.3–4× 2– 3 mm, obtuse. Distribution and Habitat: — L. tijtijensis is distributed in the Tijtij hills from 1630–1700 m in Kurdistan province which is part of the Irano-Turanian phytogeographical region. This species grows on stony slopes with Bellevalia pycnantha and B. glauca; L. tijijensis flowers in May. Four specimens were collected from the locality. The specimens are kept in IAUM herbarium. Comparison: — The most obvious characteristics of L. tijtijensis are the purple-violet fertile and purple sterile flowers respectively. The new species is similar to L. tenuiflora (Tausch.) Heldr in having relatively broad scabrid leaves which are longer than scape, black perianth lobes and horizontal or deflexed pedicels of fertile flowers. It differs in the shape of raceme, the shape and colour of fertile and sterile flowers and the capsule shape (Table. 1). Ethymology:— The new species was named based on its locality, Tijtij city is between Sanandaj and Marivan. Additional specimens examined:— IRAN. Kurdistan: Tijtij, Sanandaj to Marivan road. Tijtij hills, 1630- 1700 m, 2 May 2010, Jafari, Dezyanian & Kaffash, 109-112, (IAUM, TARI). The discovery of this new species raises the number of Iranian species in the genus Leopoldia to six; most of them are distributed in the west and north of Iran.Published as part of Jafari, Azarnoosh, 2012, A new species of Leopoldia (Asparagaceae) from Iran, pp. 61-64 in Phytotaxa 43 on page 62, DOI: 10.11646/phytotaxa.43.1.3, http://zenodo.org/record/489495
A new generalization of contra-continuity via Levine's g-closed sets
No full textIn [Dontchev J. Contra-continuous functions and strongly S-closed spaces. Int J Math Math Sci 1996;19:303–10], Dontchev introduced and investigated a new notion of continuity called contra-continuity. Recently, Jafari and Noiri [Jafari S, Noiri T. Contra-a-continuous functions between topological spaces. Iran Int J Sci 2001;2:153–67, Jafari S, Noiri T. Contra-super-continuous functions. Ann Univ Sci Budapest 1999;42:27–34, Jafari S, Noiri T. On contraprecontinuous functions. Bull Malaysian Math Sci Soc 2002;25(2):115–28] introduced new generalizations of contracontinuity called contra-a-continuity, contra-super-continuity and contra-precontinuity. In this paper, we introduce and investigate a generalization of contra-continuity by utilizing Levine’s generalized closed sets
Mohammad Ebrahim Jafari: Aesthetics of Painting in Poetry
Get PDFThe article is devoted to the creative heritage of the outstanding figure of Iranian culture — poet and artist Mohammad Ebrahim Jafari (1940–2018). The novelty of the presented research is determined by the almost complete absence of scientific works devoted to this issue: basic biographical facts, analysis of artistic language and the specific imagery of M. E. Jafari are poorly represented even in the Persian language. The purpose of the work is to identify the features of the national-cultural horizon of the synthetic genre combining painting and poetry developed by Jafari. To achieve this goal, it was necessary, firstly, to trace the poet’s biography; secondly, to clarify the nature of the artistic images created by him at different stages of his life and to analyze the original method of the author’s initiative as a way of artistic enrichment of the new synthetic genre. The multifaceted nature of the research subject determined the need for an interdisciplinary approach and the use of a complex of methods such as biographical, hermeneutic, and comparative typological. The author of the article has studied all the video materials and interviews of the poet published to date, his paintings, as well as a collection of selected poems. The author of the article also translated, for the first time, from Persian all the poetic material presented in the text. The study showed that M. E. Jafari, who does not differentiate the forms of creativity, easily transfers the stylistic techniques of his paintings to poems, which fills his lyrics with different shades of colors and smells. Poetic rhythm can be seen in his paintings, at the same time, abstract pictorial images embody the most significance for the poet in terms of acuity of perception, creating images of space and time as a unique experience, extremely concrete in its strength and depth. The masterly combination of abstract expressiveness and specificity of the sensual image makes it possible to attribute the deeply personal artistic creativity of M. E. Jafari to the cultural wave of new poetry, which meets the basic principles of the philosophy of Iranian modernism
Jafari Transformation for Solving a System of Ordinary Differential Equations with Medical Application
No full textIntegral transformations are essential for solving complex problems in business, engineering, natural sciences, computers, optical science, and modern mathematics. In this paper, we apply a general integral transform, called the Jafari transform, for solving a system of ordinary differential equations. After applying the Jafari transform, ordinary differential equations are converted to a simple system of algebraic equations that can be solved easily. Then, by using the inverse operator of the Jafari transform, we can solve the main system of ordinary differential equations. Jafari transform belongs to the class of Laplace transform and is considered a generalization to integral transforms such as Laplace, Elzaki, Sumudu, G_transforms, Aboodh, Pourreza, etc. Jafari transform does not need a large computational work as the previous integral transforms. For the Jafari transform, we have studied some valuable properties and theories that have not been studied before. Such as the linearity property, scaling property, first and second shift properties, the transformation of periodic functions, Heaviside function, and the transformation of Dirac’s delta function, and so on. There is a mathematical model that describes the cell population dynamics in the colonic crypt and colorectal cancer. We have applied the Jafari transform for solving this model
Reverse impact of temperature as climate factor on milk production in Chahar Mahall and Bakhtiari
Get PDFWhen long-term changes in normal weather patterns happen in a certain area, it generally could be identified as climate change. The concentration of the principal's greenhouse gases such as carbon dioxide, nitrous oxide, methane, ozone, and water vapor will cause climate change and perhaps climate variability. Main climate factors are temperature, precipitation, air pressure, and humidity. Extreme events may be the result of the changing of carbon dioxide concentration levels in the atmosphere which cause a change in temperature. Extreme events in some ways will affect the productivity of crop and dairy livestock. In this research, the correlation of milk production and temperature as the main climate factor in ChaharMahal and Bakhtiari province in Iran has been considered. The methodology employed for this study consists, collect reports and published national and provincial data, available recorded data on climate factors and analyzing collected data using statistical software. Milk production in ChaharMahal and Bakhtiari province is in the same pattern as national milk production in Iran. According to the current study results, there is a significant negative correlation between milk production in ChaharMahal and Bakhtiari provinces and temperature as the main climate change factor
Non-western contexts: the invisible half
No full textLike many other disciplines within the broad area of social sciences (e.g., anthropology, gender studies, psychology, sociology, etc.), consumer research is also highly navigated by scholars from Western countries. This, however, does not mean, by any means, that consumer research is devoted to studying Western contexts only. As evident from the ever-increasing number of regional conferences (e.g., Asia-Pacific and Latin American conferences of the Association for Consumer Research) and non-Western students' enrolment in doctoral programs at Western universities, there are many more researchers (from non-Western countries) who are entering the field and enriching it by their colourful contributions. Yet, given the low number of publications on consumer research in non-Western contexts, it seems that our current knowledge in these societies has a long way to go to flourish. More specifically, and in the domain of consumption culture research, this gap is even further widened by the fact that the culture of consumption in such contexts is largely interpreted with reference to the 'grand narratives' of Western scholars (e.g., Foucault, Mafessoli, Bourdieu, Deleuze, Baudrillard, Nietzsche, Durkheim, Derrida, etc.). Therefore, from an ontological perspective, it seems that our existing knowledge about non-Western societies lies heavily on the 'theoretical structures' that are 'constructed' by Western philosophy as a set of ideas, beliefs, and practices (Said, 1978). As Belk (1995) reminds us, consumption culture always existed in all human societies. What makes contemporary societies different from that of our predecessors' is not the fact that consumption culture did not exist in those societies, but that consumption culture has become a prevailing feature in modern society (Slater, 1997; Lury, 1996; Fırat and Venkatesh, 1995; McCracken, 1988). Therefore, the nature and dynamics of consumption culture in each society should be studied not only against the sociocultural, historical, and economic background of a given context (Western or non-Western) but also with reference to the philosophical and epistemological viewpoints that analyse and interpret cultural practices of that society from within that culture. Addressing such issues, this paper discusses some of the key reasons for lack of theory development in the field from non-western contexts. The paper invites scholars in non-Western contexts to introduce the less articulated, and sometime hidden, body of knowledge from their own contexts into the field of marketing in general and consumer research in particular
Crotalia jafari: a new weakly calcified holococcolithophore genus and species from the Southwest Indian Ocean
No full textInternational audienceWe here describe a distinctive weakly calcified holococcolithophore Crotalia jafari gen. et sp. nov. from the Southwest Indian Ocean phytoplankton. The coccospheres of Crotalia jafari measure 8–15 ?m in diameter, and possess 430–538 coccoliths, with each coccolith measuring less than 1 ?m in diameter. The coccoliths are tightly attached to each other by an organic layer. Their central area appears open. Finger-shaped extensions are present in the peripheral coccoliths, and stretch from the hexagonal surface layer towards the basal plate. The basal plate is flat and composed of irregular wall fabric. The crystallites of the coccoliths are small. These morphological features make this holococcolithophore unique among the extant and fossil coccolithophores. The described species is therefore placed into the new genus ‘Crotalia’. This study also suggests that high diversity of weakly calcified (and still undescribed) holo- and heterococcolithophores may exist in the Southern Ocean, which requires additional careful observation
Can society nurture humanistic marketing?
No full textFor more than four decades, academic debates on the morality of marketing have focused mainly on the advantages and disadvantages of marketing as an institution. This essay questions the usefulness of such debates to addressing many challenges of life in contemporary society and argues that engagement in such discussions will only entrap us in vicious circles of argumentation. The author calls for collective social responsibility and argues that humanistic marketing can only be realised in a humanistic society
Optimal Integration of Rooftop PV and Wind Powers for Cost-Efficient and Low-Carbon Operation of Sustainable Railway Systems
No full textThis paper focuses on the environmental and economic impact of electric railway systems (ERS) and introduces Railway Energy Management Systems (REMS) as a green solution to reduce greenhouse gas (GHG) emissions and CO2 pollution and reducing the operational cost of the station while allowing surplus electricity sales to the grid market. The research utilizes Mixed Integer Linear Programming (MILP) to optimize the operation cost and GHG reduction of railway station electrical systems in Milan, Italy. The study considers Renewable Energy Resources (RERs), Energy Storage Systems (ESSs), Regenerative Braking Energy (RBE), and the electrical grid. It also incorporates real-time data to account for the probabilistic and stochastic behaviors of these elements, leading to a significant cost reduction of 56.09% in smart railway station operations. MATLAB is employed to solve the model effectively, demonstrating the suitability and effectiveness of the proposed approach with compelling evidence of operational cost and GHG reductions in various scenarios, achieving a reduction of 3458.26 kg/day in the best scenario
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