92,878 research outputs found
Modeling the mitigation of seawater intrusion by pumping of brackish water from the coastal aquifer of Wadi Ham, UAE
No full textThe control and management of seawater intrusion in coastal aquifers is a major challenge in the field of water resources management. Seawater intrusion is a major problem in the coastal aquifer of Wadi Ham, United Arab Emirates, caused by intensive groundwater abstraction from increased agricultural activities. This has caused the abandonment of salinized wells and ultimately affected farming activities and domestic water supply in the area. In this study, the 3D finite element groundwater flow and solute transport model is developed using FEFLOW to simulate pumping of brackish water from the intrusion zone to control seawater intrusion in the aquifer. The model was calibrated and validated with available records of groundwater levels and salinity distribution. Different simulation scenarios were conducted to obtain optimum pumping locations, rates as well as a number of wells. A comparison between scenarios of non-pumping and pumping of brackish water was conducted. Results showed an increase in the concentration of groundwater salinity under the non-pumping scenario, while it decreased under the pumping scenario. Under the non-pumping scenario, isoline 30,000 mgl−1 was observed to have intruded into the south-eastern part of the aquifer, while the maximum isoline observed for the same area under the pumping scenario was 20,000 mgl−1. This result showed an overall improvement in the quality of groundwater and ultimately halted seawater intrusion in the aquifer
The ants (Hymenoptera:formicidae) of Rawdhat Khorim Nature Preserve, Saudi Arabia, with description of a new species of the genus Tetramorium Mayr
No full textSharaf, Mostafa R., Abdel-Dayem, Mahmoud S., Al Dhafer, Hathal M., Aldawood, Abdulrahman S. (2013): The ants (Hymenoptera:formicidae) of Rawdhat Khorim Nature Preserve, Saudi Arabia, with description of a new species of the genus Tetramorium Mayr. Zootaxa 3709 (6): 565-580, DOI: 10.11646/zootaxa.3709.6.
Effects Of Irrigation With Saline Water, And Soil Type On Germination And Seedling Growth Of Sweet Maize (Zea Mays L.)
No full textGermination and early growth of maize Sweet Maize (Zea mays L.), var.
(SEL. CONETA) under irrigation with saline water were investigated in a pot
experiment with different soil types. Seven salinity levels of irrigation water
up to 12 dS/m were used on a Clay soil (C) and a Sandy-Loam (SL).
Emergence of maize was delayed under irrigation with saline water, and the
final percentage of germination was reduced only at 8 dS/m or above.
Seedling shoot and root growth were reduced starting at 4 dS/m of irrigation
water. Salts accumulated more in the C soil but reductions in final
germination rate and seedling growth were larger in the SL soil, although
differences were not always significant. Data indicate that germination is
rather tolerant to salinity level in var. SEL. CONETA whereas seedling
growth is reduced at moderate salinity levels, and that soil type affects plant
performance under irrigation with saline water
supplemental_material – Supplemental material for The Factor Structure of Outcome Questionnaire–45.2 Scores Using Confirmatory Tetrad Analysis–Partial Least Squares
No full textSupplemental material, supplemental_material for The Factor Structure of Outcome Questionnaire–45.2 Scores Using Confirmatory Tetrad Analysis–Partial Least Squares by Saundra M. Tabet, Glenn W. Lambie, Shiva Jahani and S. Mostafa Rasoolimanesh in Journal of Psychoeducational Assessment</p
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
FIGURE 2 in Further records of pseudoscorpions (Arachnida, Pseudoscorpiones) from Saudi Arabia
No full textFIGURE 2. Type locality of Pseudochthonius arabicus Mahnert n. sp. a, Map of Saudi Arabia, showing location of site; b, Al Bahah, Al Mukwah Dhi Ayn Archeological Village (type locality), (photograph by M. Abdel-Dayem); c, Habitat (photograph by M. Sharaf).Published as part of Mahnert, Volker, Sharaf, Mostafa & Aldawood, Abdulrahman S., 2014, Further records of pseudoscorpions (Arachnida, Pseudoscorpiones) from Saudi Arabia, pp. 387-393 in Zootaxa 3764 (3) on page 390, DOI: 10.11646/zootaxa.3764.3.8, http://zenodo.org/record/22754
Neoseiulella neoviniferae Basha, Mahrous and Mostafa
No full textNeoseiulella neoviniferae Basha, Mahrous and Mostafa (Figure 33) Neoseiulella grapevini Basha et al., Chant and Mc- Murtry 2007: 147. Adult female (Figure 33a – d) Dorsal shield (Figure 33a) — Dorsal shield distinctly reticulated throughout: length 386 (381 – 390), width 175 (171 – 178) (at level of s4) and 191 (187 – 195) (at level of Z1). Seven pairs of large solenostomes on the dorsal shield: gd1, gd2, gd4, gd5, gd6, gd8, and gd9. Five pairs of poroids. Sublateral setae (r3 and R1) on the lateral margin. Like us, Basha et al. (2004) noted the presence of seven pairs of solenostomes. However, on their drawings gd4 is absent (present on the specimens examined). Dorsal shield bearing 19 pairs of setae, all smooth: j1 23 (21 – 25); j3 24 (22 – 26); j4 14 (12 – 15); j5 12 (10 – 13); j6 16 (15 – 17); J2 15 (14 – 15); J5 15 (14 – 15); z2 10 (9 – 11); z3 24 (22 – 25); z4 19 (17 – 20); z5 14 (13 – 15); Z1 17 (16 – 17); Z4 47 (44 – 49); Z5 62 (59 – 64); s4 23 (22 – 24); s6 26 (25 – 27); S2 35 (34 – 36); S4 33 (31 – 35); S5 28 (26 – 30); sub-lateral setae r3 28 (26 – 30) and R1 25 (23 – 27). Presence of few visible muscles marks (sigilles) on the dorsal shield. Peritreme extending anteriorly to the level of j3. Ventral shields (Figure 33b) — Sternal shield 62 (60 – 63) long and 67 (66 – 67) wide (at level of ST2), is smooth with two pairs of setae (ST1 and ST2) and two pairs of poroids. ST3 and ST4 on separate platelets. A pair of small poroids accompanying ST4. Genital shield 128 (125 – 131) long and 66 (64 – 67) wide (at level of ST5), smooth. Four elongate platelets or genital sigilla between genital and ventrianal shields. One pair of poroids close to the genital shield (ST 5) and 4 pairs of poroids around the genital shield. Ventrianal shield subtriangularshaped, 130 (125 – 134) long and 98 (95 – 101) wide (at level of ZV2), distinctly reticulated, with four pairs of preanal setae (JV1, JV2, JV3 and ZV2) and a pair of solenostomes gv3 posterior to JV2. Four pairs of caudoventral setae (ZV1, ZV3, JV4 and JV5) on the integument surrounding the ventrianal shield. JV5 48 (46 – 50) long, smooth. Primary metapodal plate or inguinal sigillum 39 (38 – 40) long and 5 (4 – 6) wide. Spermatheca (Figure 33c) — Cervix 4 (3 – 4) long, cup-shaped. Chelicera (Figure 33d) — Two large teeth and a pilus dentilis on the fixed digit. Movable digit 38 (36 – 39) long, unidentate. Basha et al. (2004) mentioned that the fixed digit bears three teeth. Legs (Figure 33e) — Measurements of legs: leg I 341 (333 – 349); leg II 286 (285 – 286); leg III 285 (284 – 286); leg IV 381 (369 – 393). Seven setae (2- 2/0, 2/0-1) on the genu II. One macroseta 42 (37 – 47) long, on the basitarsus IV. Material examined — Four female paratypes deposited in the collection of Plant Protection Department, Faculty of Agriculture, Zagazig University, Egypt. Adult male The male of this species is unknown. Previous reports — N. neoviniferae is only known from Al-Sharkia Governorate, El-Khattara District (Egypt) on Vitis vinifera L. (Vitaceae). Remarks — N. neoviniferae is similar to N. montforti but differs by the presence/ absence of gd5 (present on N. neoviniferae; absent on N. montforti), the shape of the spermatheca (c-shaped on N. neoviniferae; U-shaped on N. montforti) and measurements of some dorsal setae (j6, J2, z2, Z1 and R 1).Published as part of Kanouh, M., Kreiter, S., Douin, M. & Tixier, M. - S., 2012, Revision Of The Genus Neoseiulella Muma (Acari: Phytoseiidae). Re-Description Of Species, Synonymy Assessment, Biogeography, Plant Supports And Key To Adult Females, pp. 259-348 in Acarologia 52 (3) on pages 322-324, DOI: 10.1051/acarologia/20122048, http://zenodo.org/record/466709
Guideline for application of fuzzy-set Qualitative Comparative Analysis (fsQCA) in tourism and hospitality studies
No full textThe aim of this chapter is to review and illustrate a step-by-step guideline in conducting fuzzy-set Qualitative Comparative Analysis (fsQCA) in tourism and hospitality studies. As an emerging method, fsQCA is simultaneously quantitative and qualitative in nature which makes it an appropriate method for social science disciplines including tourism and hospitality area because of complex nature of relationships between multiple variables where theories and models are underdeveloped. Unlike conventional statistical techniques, fsQCA is an asymmetrical analysis technique that provides a holistic view and interrelationships among several conditions using Boolean algebra. The fsQCA analyses produce comprehensive assessment by revealing causal combinations of antecedents to predict an outcome; and identify sufficient configurations (i.e., causal combinations and recipes) and necessary condition/s. By utilizing this method, researchers would be able to produce complex, comprehensive, and robust results
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
Figure 3 in A new ant species of the Leptogenys sulcinodagroup (Hymenoptera: Formicidae) from Saudi Arabia
No full textFigure 3. Type locality: Raydah Nature Reserve.Published as part of Mostafa R. Sharaf, Shahid A. Akbar, Hathal M. Al Dhafer & Abdulrahman S. Aldawood, 2017, A new ant species of the Leptogenys sulcinodagroup (Hymenoptera: Formicidae) from Saudi Arabia, pp. 68-75 in Zoology in the Middle East 63 (1) on page 72, DOI: 10.1080/09397140.2017.1292645, http://zenodo.org/record/32282
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