83 research outputs found
Investigation of thermoelastic problem of multiple-disc friction clutches applying different thermal loads
No full textThe designers of friction clutch systems in vehicular applications should always take into account a number of essential criteria. The friction clutch should be able to transfer the torque from the driving shaft to the driven one within a short time and minimum amount of shocks and vibrations to make the engagement (disengagement) as gentle as possible. Furthermore, it is well known that high surface temperatures were noticed during the beginning of engagement period due to slipping between the contacting elements of the friction clutch system with ensuing heat generation. The transient thermoelastic problem of multi-disc systems has been deeply investigated by many scientists and researchers using numerical techniques such as finite element method. In this analysis, the influence of the sliding speed on the thermoelastic behavior when the initial heat generated is constant was studied. For this purpose an axisymmetric finite element models were developed and used in the simulation shown in the paper
OpenVirteX: Make your virtual SDNs programmable
No full textWe present OpenVirteX, a network virtualization platform that enables operators to create and manage virtual Software Defined Networks (vSDNs). Tenants are free to specify the topology and addressing scheme of their vSDN, and run their own Network Operating System (NOS) to control it. Since OpenVirteX logically decouples vSDNs from the infrastructure, it also enables the introduction of features such as link and switch resiliency, and network snapshotting and migration of these tenant networks. OpenVirteX builds on the design of FlowVisor, and functions as an OpenFlow controller proxy between an operator's network and the tenants' network OSes. Our evaluations of this implementation show that i) OpenVirteX is capable of presenting tenants with configurable vSDNs while incurring a modest overhead to the control channel, and ii) that our architecture enables the introduction of features and enhancements such as link resilience to tenant networks
FIGURE 3 in Notes on the genus Micropsalliota (Agaricales, Basidiomycota) and the description of a new species from Southern Oman
No full textFIGURE 3. Basidiomata of Micropsalliota ventricocystidiata. A, B, D: Holotype (SQUH-GOB002), C: SQUH-ATR004. Scale bars: 20 mm.Published as part of Al-Kharousi, Moza, Hussain, Shah, Al-Muharabi, Marwa A., Al-Maqbali, Dua'A, Al-Shabibi, Zahra, Al-Balushi, Abdullah H., Al-Yahya'Ei, Mohamed N., Saady, Nadiya Al, Velazhahan, Rethinasamy & Al-Sadi, Abdullah M., 2022, Notes on the genus Micropsalliota (Agaricales, Basidiomycota) and the description of a new species from Southern Oman, pp. 113-126 in Phytotaxa 543 (2) on page 119, DOI: 10.11646/phytotaxa.543.2.2, http://zenodo.org/record/645074
FIGURE 2 in Phylogeny, distribution and time divergence of Fuscoporia (Hymenochaetaceae, Basidiomycota) with the description of a new species from Dhofar region, southern part of Oman
No full textFIGURE 2. Maximum clade credibility tree using BEAST, based on combined ITS-28S-TEF1α sequences of Fuscoporia species with outgroup taxon (Coniferiporia weirii CFS 504), color circles at node tip represents the climate, the rectangular bars around the node highlights the distribution.Published as part of Hussain, Shah, Al-Kharousi, Moza, Al-Muharabi, Marwa A., Al-Maqbali, Dua'A, Al-Shabibi, Zahra, Al-Balushi, Abdullah H., Al-Yahya'Ei, Mohamed N., Saady, Nadiya Al, Velazhahan, Rethinasamy & Al-Sadi, Abdullah M., 2022, Phylogeny, distribution and time divergence of Fuscoporia (Hymenochaetaceae, Basidiomycota) with the description of a new species from Dhofar region, southern part of Oman, pp. 150-164 in Phytotaxa 570 (2) on page 157, DOI: 10.11646/phytotaxa.570.2.3, http://zenodo.org/record/725649
The Effectiveness of Lesson Study as a Professional Development Approach for Omani Teachers
No full textThis study is proposed to adopt Lesson Study (LS) as a collaborative professional development approach. Therefore, the main purpose of this study is to investigate whether the Lesson Study approach has an effect on teacher’s professional development across the Lesson Study classroom conferences. Data collected through mixed methods resources including audio-recording of classroom observations, audio recording of post-class conferences and my field notes. The data disclosed an increase improvement in teachers’ teaching quality practices throughout the Lesson Study cycles. The study revealed also that there was a gradual increase in the teachers’ critical reflection. This study, as one of the initial trials to be implemented in the Omani context, may contribute to the in-service professional development. The study may encourage stakeholders in the MOE (Ministry of Education) to take the lead in adopting the Lesson Study approach within the current in-service professional programme. Keywords: Professional development, Lesson Study, Bloom Taxonomy, mediation, scaffolding DOI: 10.7176/JEP/14-26-07 Publication date:September 30th 202
Fuscoporia dhofarensis Al-Sadi & S. Hussain 2022, sp. nov.
No full textFuscoporia dhofarensis Al-Sadi & S. Hussain, sp. nov. (Figs. 3, 4) MycoBank no: 845732 Etymology: The specific epithet “ dhofarensis ” refers to the type locality Dhofar (a governorate in the south of Oman) of the new species. Type: Oman, Dhofar, Attin, on the dead branches of Anogeissus dhofarica, 08 Sept 2018, N. Al Dhanki, S. Al Salami, M. Al Jahwari and I. Al Sabahi, ATN-007 (holotype AA-ATN007; GenBank accession: ITS = OP 593104, 28 S = OP 593105, TEF1 α = OP 597768). Description: Basidiocarps annual, pileate, initially applanate becoming ungulate with age, projecting up to 20 mm, 40 mm wide and 10 mm thick; corky, without odor or taste at fresh condition, at dry condition hard-woody and medium in weight; solitary scattered on wood; margin applanate to convex, cream-yellowish to ochre-orange (DC793A) at young stage, becoming brownish (D2B48C) at maturity. Pileus surface concentrically sulcate with zoned, variable in color, dark brown (5C4033) at attachment zone, dark reddish-brown (A52A2A) at the center, reddish-brown (A52A2A) towards the margin. Pore surface buff (DAA06D) to dull brown (5C4033) when fresh, becoming chestnut brown (5D2F27) when dry; margin dull brown (5C4033), up to 0.5 mm wide; pores circular, 6–8 per mm; dissepiment thin, entire. Context yellowish-brown (9B7A01), corky to fibrous, up to 5 mm thick. Tubes dark yellowish-brown (9B7A01), corky, 3 mm long, tube layers distinct. Hyphal system: Dimitic, generative hyphae simple septate, branched, skeletal hyphae darkening but otherwise unchanged in KOH, CB− and IKI−. Context: Generative hyphae 2.5–3.5 µm diam, hyaline, fairly numerous, slightly thin-walled, simple septate, branched, some with terminal elements, 10–30 × 3.5–4.5 µm. Skeletal hyphae 3.5–5.0 µm diam., abundant, yellowish to rusty-brown, unbranched, rarely septate, thick-walled, wall thickness up to 1.5 µm. Mycelial setae absent in context. Tubes: Generative hyphae 2.5–3.5 µm diam, rare, hyaline to pale-yellowish, simple septate, frequently branched, encrusted at dissepiment edges. Skeletal hyphae 4.5–6.0 µm diam, dominant, rusty-brown, rarely septate, unbranched, with wide lumen, sub-parallel along the tubes, think-walled. Hymenium: Hymenial setae 43.0–68.0 × 9.0–12.0 µm, numerous, originating from tramal hyphae, subulate, darkbrown to rusty-brown, thick-walled with a wide lumen. Cystidioles absent. Basidia 18.0–21.5 × 4.5–5.5 µm, clavate, 4-spored, simple septate at the base. Basidioles frequent in hymenium, similar in shape to basidia but slightly smaller. Basidiospores hyaline, cylindrical to broadly ellipsoid, thin-walled, IKI–, CB–, (4.5)5.0–6.0(6.3) × 3.5–4.0(5.2) µm, on average 5.4 ×3.7 µm, Q = 1.5. Pileus edge: Generative hyphae abundant, narrow, aseptate, unbranched, thin-walled, 2–3 µm diam, with narrow apex. Additional specimen examined: Oman, Dhofar, Salalah, Wadi Attin, 08 Sept, 2018, N. Al Dhanki, S. Al Salami, M. Al Jahwari and I. Al Sabahi, ATN-007b (AA-ATN007b). Notes: The new species Fuscoporia dhofarensis has a pileate fruiting body, with small pileus, small pores, presence of one type of setae. The new species is closely related to other pileate species of the genus such as F. callimorpha (Lév.) Groposo, Log. -Leite & Góes-Neto (2007: 57), F. senex (Nees & Mont.) Ghob. -Nejh. (2007: 208), (Pers.), F. torulosa T. Wagner & M. Fisch. (2001: 780). Basidiomata of Fuscopora dhofarensis occurring singly on wood and smaller in size, while fruiting bodies of F. senex are in clusters and substantially larger (projecting up to 110 mm, 200 mm wide and 30 mm thick at base; Dai 2010). Basidiomata of Fuscoporia torulosa is perennial pileate, with grayish brown pileus surface, pore surface grayish-brown (Dai 2010). In Fuscoporia callimorpha, pileus surface is reddishbrown, glabrous, with pore surface yellowish brown and smaller pore, 9–10 per mm (Wu et al. 2022). Morphological comparison of Fuscoporia dhofarensis with respect to these and other pileate species of the genus are further sorted out in the Table 3.Published as part of Hussain, Shah, Al-Kharousi, Moza, Al-Muharabi, Marwa A., Al-Maqbali, Dua'A, Al-Shabibi, Zahra, Al-Balushi, Abdullah H., Al-Yahya'Ei, Mohamed N., Saady, Nadiya Al, Velazhahan, Rethinasamy & Al-Sadi, Abdullah M., 2022, Phylogeny, distribution and time divergence of Fuscoporia (Hymenochaetaceae, Basidiomycota) with the description of a new species from Dhofar region, southern part of Oman, pp. 150-164 in Phytotaxa 570 (2) on pages 155-159, DOI: 10.11646/phytotaxa.570.2.3, http://zenodo.org/record/725649
Micropsalliota ventricocystidiata Al-Sadi & S. Hussain 2022, sp. nov.
No full textMicropsalliota ventricocystidiata Al-Sadi & S. Hussain, sp. nov. (Figs. 3, 4) MycoBank no: MB842602 Diagnosis: Micropsalliota ventricocystidiata can be distinguished from other species by its: medium-sized basidiomata with hemispheric pileus, covered with reddish-brown squamules, basidiospores amygdaliform to oblong, measuring 7.5–8.5 × 4.5–5.0 µm, with ventricose cheilocystidia. Etymology: The specific epithet “ ventricocystidiata ” refers to the ventricose shape of the cheilocystidia of the new species. Type: Oman, Dhofar, Gogob, 17°18′28.9″ N and 54°06′27.6″ E under the trees of Anogeissus dhofarica, 2 Sept 2018, N. Al Dhanki, S. Al Salami, M. Al Jahwari and I. Al Sabahi, GOB-002 (holotype SQUH-GOB002; GenBank accession: ITS = OM 397374, 28 S = OM 630413). Description:Pileus 30–55 mm diam, at young stage ovoid to parabolic, as the pileus opened becoming hemispheric, at mature stage convex to plano-convex; surface finely squamulose, squamules more or less triangular or granular, slightly erect, concentrated at the center, sparse towards the margin, light reddish-brown (2.5YR 5/4–2.5YR 6/4) to moderate reddish-brown (7.5R 3/4–7.5R 3/6) on a white background; margins slightly scalloped. Lamellae free, crowded (25–30 per centimeter), ventricose, reddish-gray (7.5YR 6/2), with 1–5 series of lamellulae, becoming lightbrown (5YR 6/4) with age. Stipe 40–70 × 7–10 mm, central, equal, hollow, surface granulose, granules white, sparce above the annulus, more concentrated below the annulus, on a white background; annulus single layered, membranous, ascendant, white, smooth on both surfaces. Context white, unchanged on handling. KOH reaction reddish-brown on pileus. Odor and taste not recorded. Basidiospores [60/2/2] (7.0)7.5–8.5(9.0) × (4.0)4.5–5.0(5.5) µm, on average 8.2 × 4.8 µm, Q = 1.6–1.86, av. Q = 1.7, ellipsoid to amygdaliform with acute apex in side view, oblong to sub-cylindrical in frontal view, smooth, brownish in 5% KOH, germ-pore absent. Basidia 20–26 × 8–9.5 µm, clavate, hyaline, smooth, 4-spored. Cheilocystidia 36–46 × 9.5–16 µm, mostly ventricose, rarely sub-cylindrical, abundant, smooth, hyaline. Pleurocystidia absent. Pileus covering is a cutis with septate hyphae, 10–15 µm diam, rarely branched, terminal cells 51–67 × 10–12 µm with acute apex, pale brownish in KOH. Clamp connections absent. ......continued on the next page Habitat and distribution: Scattered in small groups, saprotrophic, on humus rich soil with dead leaves and wood under the trees of Anogeissus dhofarica. So far only known from southern Oman. Additional specimens examined: Oman, Dhofar, Attir, on a shady place with plenty of liverworts, 5 Sept 2018, N. Al Dhanki, S. Al Salami, M. Al Jahwari and I. Al Sabahi, ATR-004 (SQUH-ATR004; GenBank accession: ITS = OM 397373, 28 S = OM 630414). Notes: The new species Micropsalliota ventricocystidiata is characterized by a medium-sized basidiomata with hemispheric to plano-convex pileus, covered with reddish-brown squamules; basidiospores amygdaliform with obtuse apex in side view, oblong in face view, measuring 7.5–8.5 × 4.5–5.0 µm and the cheilocystidia mostly ventricose, rarely more or less subcylindrical. ML phylogenetic analyses revealed that the closely related species of M. ventricocystidiata are: M. suthepensis, M. megaspora, M. repanda and M. sp. (SDJ 2021-8-9) an undescribed species from China. Micropsalliota suthepensis, described from Thailand, differs from M. ventricocystidiata by (i) its smaller pileus (10–20 mm diam) with violet squamules (ii) smaller spores (5–6 × 3–3.5 µm) that are somewhat similar in shape and have apical thickening, and (iii) cheilocystidia clavate with non-capitate apex (Zhao et al. 2010). Micropsalliota megaspora, also described from Thailand, differs in its small sized basidiomata, smaller spores (5.2–6.5 × 3.4–4 µm) and pyriform shaped cheilocystidia (Zhao et al. 2010). Micropsalliota repanda, originally described from Togo, differs from the new species by its pinkish pileal fibrils with clavate cheilocystidia (Heinemann 1980). Morphological comparison of the new species with regards to other species of Micropsalliota are further sorted in detail in Table 2. Morphologically, the new species M. ventricocystidiata is similar to M. digitatocystis R.L. Zhao, J.X. Li & M.Q. He (2021: 171), a recently described species from China (Li et al. 2021). Both species share the reddish-brown pileal squamules. On the basis of basidiospores morphology, both species can be differentiated. Basidiospores in M. digitatocystis are mostly ellipsoid to amygdaliform and comparatively smaller (5.8–7.4 × 4–4.6 µm; Li et al. 2021). In M. ventricocystidiata, basidiospores are amygdaliform with obtuse apex to sub cylindrical or oblong and larger (7.5–8.5 × 4.5–5.0 µm). In M. digitatocystis cheilocystidia are cylindrical to subclavate, subcapitate to capitate, measuring 37.4–52 × 9–16.4 µm. On the other hand, cheilocystidia in M. ventricocystidiata are mostly ventricose, rarely subcylindrical.Published as part of Al-Kharousi, Moza, Hussain, Shah, Al-Muharabi, Marwa A., Al-Maqbali, Dua'A, Al-Shabibi, Zahra, Al-Balushi, Abdullah H., Al-Yahya'Ei, Mohamed N., Saady, Nadiya Al, Velazhahan, Rethinasamy & Al-Sadi, Abdullah M., 2022, Notes on the genus Micropsalliota (Agaricales, Basidiomycota) and the description of a new species from Southern Oman, pp. 113-126 in Phytotaxa 543 (2) on pages 119-123, DOI: 10.11646/phytotaxa.543.2.2, http://zenodo.org/record/645074
Economic and Social Impact of Globalisation of the Developing Countries
No full textThe objectives of the study are set to guide the investigation process and sharpen the focus on the problem. To develop the research, a method would be used to carry out the study focusing on the globalisation and the problem of poverty. In this connection, a simple model using Human Development Indexes will be used to highlight the case studies of Egypt and Jordan. This method will reflect the inter-relationship between development and growth. Indicators of Human poverty including variables such as percentage of adult illiteracy rate, life expectancy, external debt services payments and external trade are used.
Following this chapter the second chapter reviews the literature relevant to the area of the study. The beginning of this chapter highlights the different views on globalisation. The chapter also investigates the relationship between globalisation and development. Though the chapter introduces the literature from a general perspective view, taking example from the scenes of world development, the sharp focus on the problem comes with the literature reviewing economic problems of developing countries.
The third chapter focuses on the methodology and models. This chapter highlights the relationship between globalisation, development and poverty through variables that have strong effect on development and poverty reduction such as income growth, development and poverty. Chapter four will focus on the present and expected image of poverty in the era of globalisation. This will enable the author to review the state of poverty in the world with closer focus on the developing countries. Finally, the last chapter will focus on the Arab countries as part of the developing world in general and cases of Egypt and Jordan in particular. Then, will draw conclusion and lessons learned and suggest some recommendations for the developing countries with emphasis on Arab countries, wherever it is necessary, in finding ways to deal with such situation
Economic and Social Impact of Globalisation of the Developing Countries
No full textThe objectives of the study are set to guide the investigation process and sharpen the focus on the problem. To develop the research, a method would be used to carry out the study focusing on the globalisation and the problem of poverty. In this connection, a simple model using Human Development Indexes will be used to highlight the case studies of Egypt and Jordan. This method will reflect the inter-relationship between development and growth. Indicators of Human poverty including variables such as percentage of adult illiteracy rate, life expectancy, external debt services payments and external trade are used.
Following this chapter the second chapter reviews the literature relevant to the area of the study. The beginning of this chapter highlights the different views on globalisation. The chapter also investigates the relationship between globalisation and development. Though the chapter introduces the literature from a general perspective view, taking example from the scenes of world development, the sharp focus on the problem comes with the literature reviewing economic problems of developing countries.
The third chapter focuses on the methodology and models. This chapter highlights the relationship between globalisation, development and poverty through variables that have strong effect on development and poverty reduction such as income growth, development and poverty. Chapter four will focus on the present and expected image of poverty in the era of globalisation. This will enable the author to review the state of poverty in the world with closer focus on the developing countries. Finally, the last chapter will focus on the Arab countries as part of the developing world in general and cases of Egypt and Jordan in particular. Then, will draw conclusion and lessons learned and suggest some recommendations for the developing countries with emphasis on Arab countries, wherever it is necessary, in finding ways to deal with such situation
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