4,803 research outputs found
‘Tenderstem’ Broccoli for Export Markets: an Analysis Study on the AgroFood Company
No full textDecision case, horticulture, agriculture economics, broccoli production, protected vegetable production, Agricultural Finance, Crop Production/Industries, Production Economics,
Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars
No full textFahim, Shimaa F., El-Saiedy, El-Sayed M. (2021): Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars. Persian Journal of Acarology 10 (2): 191-204, DOI: 10.22073/pja.v10i2.6366
On the fractional-order logistic equation
No full textAbstractThe topic of fractional calculus (derivatives and integrals of arbitrary orders) is enjoying growing interest not only among mathematicians, but also among physicists and engineers (see [E.M. El-Mesiry, A.M.A. El-Sayed, H.A.A. El-Saka, Numerical methods for multi-term fractional (arbitrary) orders differential equations, Appl. Math. Comput. 160 (3) (2005) 683–699; A.M.A. El-Sayed, Fractional differential–difference equations, J. Fract. Calc. 10 (1996) 101–106; A.M.A. El-Sayed, Nonlinear functional differential equations of arbitrary orders, Nonlinear Anal. 33 (2) (1998) 181–186; A.M.A. El-Sayed, F.M. Gaafar, Fractional order differential equations with memory and fractional-order relaxation–oscillation model, (PU.M.A) Pure Math. Appl. 12 (2001); A.M.A. El-Sayed, E.M. El-Mesiry, H.A.A. El-Saka, Numerical solution for multi-term fractional (arbitrary) orders differential equations, Comput. Appl. Math. 23 (1) (2004) 33–54; A.M.A. El-Sayed, F.M. Gaafar, H.H. Hashem, On the maximal and minimal solutions of arbitrary orders nonlinear functional integral and differential equations, Math. Sci. Res. J. 8 (11) (2004) 336–348; R. Gorenflo, F. Mainardi, Fractional calculus: Integral and differential equations of fractional order, in: A. Carpinteri, F. Mainardi (Eds.), Fractals and Fractional Calculus in Continuum Mechanics, Springer, Wien, 1997, pp. 223–276; D. Matignon, Stability results for fractional differential equations with applications to control processing, in: Computational Engineering in System Application, vol. 2, Lille, France, 1996, p. 963; I. Podlubny, A.M.A. El-Sayed, On Two Definitions of Fractional Calculus, Solvak Academy of science-institute of experimental phys, ISBN: 80-7099-252-2, 1996. UEF-03-96; I. Podlubny, Fractional Differential Equations, Academic Press, 1999] for example). In this work we are concerned with the fractional-order logistic equation. We study here the stability, existence, uniqueness and numerical solution of the fractional-order logistic equation
Recent seismicity and realistic waveforms modeling to reduce the ambiguities about the 1303 seismic activity in Egypt
No full textFigure 2 in Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars
No full textFigure 2. Mean numbers of Tetranychus urticae and Amblyseius swirskii populations on four strawberry cultivars during 2018/2019 season.Published as part of Fahim, Shimaa F. & El-Saiedy, El-Sayed M., 2021, Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars, pp. 191-204 in Persian Journal of Acarology 10 (2) on page 195, DOI: 10.22073/pja.v10i2.63667, http://zenodo.org/record/503805
Terpnacarus zaheri Momen, Sayed & Nasr, 2004, n. sp.
No full textTerpnacarus zaheri n. sp. (Figs 1–7) ADULT FEMALE. Dimensions: length of body (including gnathosoma) 333–346, length of body (excluding gnathosoma) 301–306, breadth of body 180–189. Dorsum (Figs 1 & 2). The prodorsum bears 6 pairs of setae (Fig. 2). Setae le robust, distinctly logner than setae xp and in, are of equal length of setae xa (35–38), setae ro (14– 16), which situated on the naso, are shorter than setae in (18–21). Setae xp are very small and pectinate. The naso is large and bears a lenslike eye ventrally. Sensillae bo are filamentous and ciliate (56–61 long). The central part of the prodorsum has longitudinal smooth striae. The hysterosoma (Fig. 1) bears 36 pairs of plumose setae which are situated in 9 transverse rows. Striae on the dorsum of the hysterosoma are smooth. Venter: The genital opening (Fig. 6) is relatively large and the covers are clearly defined. Each cover bears 14 large and pilose setae, arranged in two rows. Three pairs of genital papillae as well as 3 pairs of long, nude internal setae are present. Six pairs of paragenital setae are present. The anal pore is surrounded by 6 pairs of anal setae and 5 pairs of paraanals. Gnathosoma (Figs. 3–5): The chelicerae (Fig. 3) are bulky, chelatedentate and bear 2 setae dorsally. The hypognathum (Fig. 4) bears 6 pairs of setae, the anterior pair, small and nude, while the second pair are robust and relatively blunt distally. The rutella are well developed and each terminates in a sharp bladelike edge. The palpal tarsus (Fig. 5) bears 11 plumose setae, one smooth and short seta, one obtuse solenidion and terminally one yataganshaped solenidion. Legs: Leg setal patterns (formula indicates setation from tarsus to trochanter with solenidion in parentheses). Tarsus I (Fig. 7) bears one long, slender solenidion and one famulus, while tibia I bears 2 slender solenidia and genu I bears 3 mucronate solenidia. The ambulacra of all the legs are composed of a large, rayed clawlike empodium and two true claws which are barbed and smaller than the empodium. MALE: Unknown. Etymology: The new species is named for Prof. M. Zaher, Department of Zoology, Cairo University, Egypt. Type data: Female holotype collected from debris under date palm, paratypes 5 females collected with the holotype, Egypt, 20 September 2003 by Dr. A. A. Sayed. Remarks: The genus Terpnacarus has not been recorded in Egypt before this report. The new species resembles T.carolinaensis Theron (1976) described from South Africa in having smooth and fine striation on the hysterosomal integument. It differs from the latter by having 36 pairs of hysterosomal setae opposed to 34 pairs in T. carolinensis, in having one seta on trochanter I compared to nil in T. carolinaensis. It can be separated also by having 5 pairs of para anal setae compared to 6 pairs in T. carolinaensis.Published as part of Momen, F. M., Sayed, A. A. & Nasr, A. K., 2004, A new species of the genus Terpnacarus Grandjean (Acari: Terpnacaridae) from Egypt, pp. 1-4 in Zootaxa 543 on pages 2-4, DOI: 10.5281/zenodo.15734
Figure 3 in Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars
No full textFigure 3. Overall mean numbers of Tetranychus urticae and Amblyseius swirskii on four strawberry cultivars during (a) 2017/2018 and (b) 2018/2019 seasons.Published as part of Fahim, Shimaa F. & El-Saiedy, El-Sayed M., 2021, Seasonal abundance of Tetranychus urticae and Amblyseius swirskii (Acari: Tetranychidae and Phytoseiidae) on four strawberry cultivars, pp. 191-204 in Persian Journal of Acarology 10 (2) on page 196, DOI: 10.22073/pja.v10i2.63667, http://zenodo.org/record/503805
Size Effect on Concrete Shear Strength in Beams Reinforced with FRP Bars
No full textThe understanding of size effect on the concrete shear strength of beams reinforced with fiber-reinforced polymer (FRP) bars is of fundamental and practical significance. The calibration and verification of the ACI 440 shear design algorithm has been mainly based on experimental results from specimens with a maximum effective depth of 360 mm (14.19 in.), which are not always representative of large-scale applications. In this paper, the results of laboratory tests on scaled FRP-reinforced concrete beams without shear reinforcement, having a maximum effective depth of 883 mm (34.75 in.), are presented. Based also on results available in the literature for normal-strength concrete, the scaling of strength is discussed in relation to effective depth, reinforcement ratio, aggregate size, and presence of minimum shear reinforcement and longitudinal skin reinforcement. Representative North American design algorithms that account for the shear force being resisted primarily by the uncracked concrete in compression (ACI) and through aggregate interlock (CSA) are then assessed
Tenuipalpus granati Sayed 1946
No full textTenuipalpus granati Sayed 1946 (Figs 82–88) Tenuipalpus granati Sayed 1946: 100; Wainstein 1960: 247; Livshitz & Mitrofanov 1967: 31; Meyer (Smith) 1979: 70. Tenuipalpus orchidarum Sayed 1942: 96. Misidentification. Diagnosis. Dorsum with irregular striae but almost smooth in the Turkish specimens, longitudinal laterally on opisthosoma, venter with mainly transverse striae. Dorsal opisthosomal setae c 1, f 2 present; setae d 1 and e 1 absent. Venter with two pairs of 4 a setae. Spermatheca is a long, slender tube, terminating in small bulb. Female. Dimensions: Length of body excluding gnathosoma 240–254; width 139–141, infracapitulum covered by anterior prodorsal projection; Legs: I 119–122; II 105–109; III 100–107; IV 105–108; setae: v 2 6–7; sc 1 8–11; sc 2 30–35; c 1 8–13; c 3 10–18; d 3 8–10; e 3 11 –19; f 2 17–26; f 3 15–24; h 1 122–147; h 2 14–19. Body oval. Dorsum (Fig. 82). Anterior prodorsal projection deeply notched medially forming pair of pointed lobes medially. Prodorsum with an angulate anterolateral margin, just anterior to setae sc 2; opisthosoma gradually narrowing posteriorly, with two large lateral pores. Prodorsum and opisthosoma with scattered longitudinal to diagonal striae. Dorsal body setae slender, lanceolate, and weakly serrate. Venter (Figs 83–84). Venter striate. Metapodosoma with one pair of 3 a and two pairs of flagellate 4 a. Striation pattern of ventral and genital shields mostly transverse, with some longitudinal striae laterad in genital region. Pair of aggenital setae slightly longer than two pairs of genital setae, reaching to or slightly passing bases of genital setae; two pairs of pseudanal setae. Ventral setae smooth. Genital setae transversely aligned. Spermatheca a long, slender tube; terminating in a small bulb. Gnathosoma (Fig. 85). Infracapitulum covered by anterior projection, reaching to middle of femur I. Palp three-segmented, tarsus with a eupathidium, seta on tibia with at least two serrations; distal segment almost half length of second segment. Legs (Figs 86–88). Setae and solenidia (included in counts) on segments of legs I–IV: coxae 2 - 2 - 1 - 1, trochanters 1 - 1-2 - 1, femora 4 - 4 - 2 - 1, genua 2 - 2 -0-0, tibiae 5 - 5 - 3 - 3, and tarsi 9 (ω)- 9 (ω)- 5 - 5. Leg chaetotaxy as follows: trochanters I, II, IV v’; tr III l’, v ’; femora I-II d, v, bv”, l’; fe III d, ev ’; fe IV ev ’; genua I-II l’, l”; ge III-IV nude; tibiae I–II d, l’, l”, v’, v”; ti III–IV d, v’, v”; tarsus I–II u’, u”, p’, p” tc’, tc”, ft’, ft”, ω; ta III–IV u’, u”, tc’, tc”, ft’. Dorsal setae on femora I–III lanceolate and serrate, absent on genua I–II. Material examined. 1 female from Vitis vinifera L. (Vitaceae), Salihli/Manisa, 10 September 1997, S. Çobanoğlu; 2 females from Vitis vinifera, Menemen Çavuşköy /Izmir, 04–05 September 1997, (Collector; S. Çobanoğlu. Deposited at University of Ankara). Distribution. Azerbaijan, Cyprus, Egypt, Georgia, Greece, India, Iran, Kazakhstan, Ukraine (Sayed 1946; Pritchard & Baker 1958; Wainstein 1960; Dosse 1971; Sadana & Gupta 1984; Hatzinikolis 1986 a; Khanjani et al. 2013 b).Published as part of Çobanoğlu, Sultan, Ueckermann, Edward Albert & Sağlam, Hayriye Didem, 2016, The Tenuipalpidae of Turkey, with a key to species (Acari: Trombidiformes), pp. 151-186 in Zootaxa 4097 (2) on pages 177-178, DOI: 10.11646/zootaxa.4097.2.1, http://zenodo.org/record/27102
Towards a sterile insect technique field release of <it>Anopheles arabiensis </it>mosquitoes in Sudan: Irradiation, transportation, and field cage experimentation
No full textAbstract Background The work described in this article forms part of a study to suppress a population of the malaria vector Anopheles arabiensis in Northern State, Sudan, with the Sterile Insect Technique. No data have previously been collected on the irradiation and transportation of anopheline mosquitoes in Africa, and the first series of attempts to do this in Sudan are reported here. In addition, experiments in a large field cage under near-natural conditions are described. Methods Mosquitoes were irradiated in Khartoum and transported as adults by air to the field site earmarked for future releases (400 km from the laboratory). The field cage was prepared for experiments by creating resting sites with favourable conditions. The mating and survival of (irradiated) laboratory males and field-collected males was studied in the field cage, and two small-scale competition experiments were performed. Results Minor problems were experienced with the irradiation of insects, mostly associated with the absence of a rearing facility in close proximity to the irradiation source. The small-scale transportation of adult mosquitoes to the release site resulted in minimal mortality ( Conclusion It is concluded that although conditions are challenging, there are no major obstacles associated with the small-scale irradiation and transportation of insects in the current setting. The field cage is suitable for experiments and studies to test the competitiveness of irradiated males can be pursued. The scaling up of procedures to accommodate much larger numbers of insects needed for a release is the next challenge and recommendations to further implementation of this genetic control strategy are presented.</p
- …
