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Effects of Heat and mass Transfer on the Perfect Conducting Polar Fluid Over a Stretching Sheet Due to Thermal Radiation

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Advances in Applied mathematics and mechanics 2010年第1期2卷 86-106页

作者： m.zakaria Department of mathematics Faculty of ScienceAl-Baha UniversityP.O.Box 1988 Al-Baha Kingdom of Saudi Arabia

The objectives of the present study are to investigate the effects of heat and mass transfer on the unsteady flow of a perfect conducting polar fluid over a flat sheet with a linear velocity in the presence of thermal *** approximation method developed in zakaria[***.10(2002),***.155(2005)]is adopted to solve the *** effects of Alfven velocity,mass transfer,various material parameters,Prandtl number,Schmidt number and relaxation time on the velocity,angular velocity,temperature and concentration are discussed and illustrated graphically.

关键词： Heat and mass transfer relaxation time perfectly conducting polar fluid

Influence of potassium fertilization and foliar application of zinc and phosphorus on growth,yield components,yield and fiber properties of Egyptian cotton(Gossypium barbadense L.)

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Journal of Plant Ecology 2008年第4期1卷 259-270页

作者： zakaria m.Sawan mahmoud H.mahmoud Amal H.El-Guibali Cotton Research Institute Agricultural Research CenterMinistry of Agriculture and Land Reclamation9 Gamaa StreetGiza 12619Egypt Soils Water and Environment Research InstituteAgricultural Research CenterMinistry of Agriculture and Land Reclamation9 Gamaa StreetGiza 12619Egypt

Aims Supplying optimal quantities of mineral nutrients to growing crop plants is one way to improve crop *** need to be used rationally in order to avoid a negative ecological impact and undesirable effects on the sustainability of agricultural production *** application of nutrients also affects the farmer’s *** order to calculate the amount of fertilizer to be applied to crops,it is necessary to develop recommendation programmers that adjust nutrient rates to crop *** Experiments in two successive seasons were conducted to investigate the effect of K fertilization and foliar application of Zn and P on yield and fiber properties of cotton *** ***(0.0 and 47.4 kg of K ha^(-1))was soil applied,while chelated zinc(0.0 and 57.6 g of Zn ha^(-1),applied twice at 70 and 85 days after sowing‘DAS’)and phosphorus(0.0,576,1152 and 1728 g of P ha^(-1),applied twice at 80 and 95 DAS)were applied to the *** findings Dry matter yield,total chlorophyll concentration,K,Zn and P uptake per plant,number of opened bolls per plant,boll weight,seed index,lint index,seed cotton yield per plant,seed cotton and lint yield ha^(-1) and earliness of harvest increased with the application of K,Zn and *** generally had no significant effect on lint percentage and fiber properties,with exceptions,for micronaire reading and flat bundle strength,and uniformity ratio,where the mean values of these characters were significantly increased over the untreated control by applying K,and for the micronaire reading in the first season,when applying P at 1728 g ha^(-1),and uniformity ratio in the second season,when applying Pat 1152 and 1728 g ha^(-1),where the mean values of these characters were significantly increased over the untreated control by applying *** the conditions of this study,applying K fertilization at 47.4 kg ha^(-1) combined with spraying cotton plants with zinc at 57.6 g ha^(-1) and also with P at

关键词： cotton fiber properties phosphorus potassium yield and yield components zinc

Climatic variables: Evaporation, sunshine, relative humidity, soil and air temperature and its adverse effects on cotton production

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Information Processing in Agriculture 2018年第1期5卷 134-148页

作者： zakaria m.Sawan Cotton Research Institute Agricultural Research CenterMinistry of Agriculture&Land Reclamation9 Gamaa Street12619 GizaEgypt

Cotton yield is a function of growth rates,flower production rates,and flower and boll retention during the fruiting *** on the relationship between climatic factors and the cotton plant’s ability to produce and sustain flower buds,flowers,and bolls will allow one to model plant responses to conditions that frequently occur in the field and to predict developmental rate or the formation of these *** study investigates the statistical relationship between various climatic factors and overall flower and boll ***,the relationship between climatic factors and production of flowers and bolls obtained during the development periods of the flowering and boll ***,predicting effects of climatic factors during different convenient intervals(in days)on cotton flower and boll production compared with daily ***,sunshine duration,relative humidity,surface soil temperature at 1800 h,and maximum air temperature,are the important climatic factors that significantly affect flower and boll *** five-day interval was found to be more adequately and sensibly related to yield ***;minimum humidity and sunshine duration were the most effective climatic factors during preceding and succeeding periods on boll production and *** was a negative correlation between flower and boll production and either evaporation or sunshine duration,while that correlation with minimum relative humidity was positive.

关键词： Cotton flower and boll production Evaporation Relative humidity Sunshine duration Temperature

Application of Biochars for Soil Constraints:Challenges and Solutions

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Pedosphere 2015年第5期25卷 631-638页

作者： zakaria m.SOLAImAN Hossain m.ANAWAR Soil Biology and molecular Ecology Group School of Earth and Environment (M087) and UWA Institute of AgricultureThe University of Western Australia School of Earth and Environment (m087) and UWA Institute of Agriculture The University of Western Australia

Biochar addition to soil is currently being considered as a means to sequester carbon while simultaneously improving soil health,soil fertility and agronomic benefits. The focus of this special issue is on current research on the effects of biochar application to soil for overcoming diverse soil constraints and recommending further research relating to biochar application to soil. The biochar research has progressed considerably with important key findings on agronomic benefits, carbon sequestration, greenhouse gas emissions, soil acidity, soil fertility, soil health, soil salinity, etc., but more research is required before definitive recommendations can be made to end-users regarding the effects of biochar application across a range of soils, climates and land management practices.

关键词： agronomic benefits carbon sequestration greenhouse gas emissions pH soil fertility soil health soil salinity

Biochar:An Emerging Panacea for Remediation of Soil Contaminants from mining,Industry and Sewage Wastes

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Pedosphere 2015年第5期25卷 654-665页

作者： Hossain m.ANAWAR Farjana AKTER zakaria m.SOLAImAN Vladimir STREZOV School of Earth and Environment (m087) and UWA Institute of Agriculture The University of Western Australia Sher-e-Bangla Agricultural University Department of Environmental Sciences Faculty of Science and EngineeringMacquarie University

mine tailings, waste rock piles, acid mine drainage, industrial wastewater, and sewage sludge have contaminated a vast area of cultivable and fallow lands, with a consequence of deterioration of soil and water quality and watercourses due to the erosion of contaminated soils for absence of vegetative cover. High concentrations of toxic elements, organic contaminants, acidic soils, and harsh climatic conditions have made it difficult to re-establish vegetation and produce crops there. Recently, a significant body of work has focussed on the suitability and potentiality of biochar as a soil remediation tool that increases seed emergence, soil and crop productivity, above ground biomass, and vegetation cover on mine tailings, waste rock piles, and industrial and sewage waste- contaminated soils by increasing soil nutrients and water-holding capacity, amelioration of soil acidity, and stimulation of microbial diversity and functions. This review addresses： i） the functional properties of biochar, and microbial cycling of nutrients in soil; ii） bioremediation, especially phytoremediation of mine railings, industrial waste, sewage sludge, and contaminated soil using biochar; iii） impact of biochar on reduction of acid production, acid mine drainage treatment, and geochemical dynamics in mine railings; and iv） treatment of metal and organic contaminants in soils using biochar, and restoration of degraded land.

关键词： acid mine drainage contaminated soil interaction mine railings mining waste phytoremediation phytostabilization revegetation

Vascular endothelial growth factor,p53,and the H-ras oncogene in Egyptian patients with bladder cancer

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World Journal of Gastrointestinal Oncology 2009年第1期1卷 62-68页

作者： Farha A El-Chennawi Fatma A Auf Shereen S metwally Youssef m mosaad Atallah A Shaaban mahmoud Abdo El-Baz Ziyad E Tawhid zakaria F Lotfy Clinical Immunology Unit Clinical Pathology DepartmentMansoura Faculty of MedicineMansoura University Urology & Nephrology Center Mansoura Faculty of MedicineMansoura University Pathology Department Mansoura Faculty of MedicineMansoura University

AIm:To evaluate the relationship between vascular endothelial growth factor(VEGF),p53,and the H-ras oncogene and different clinicopathological parameters in Egyptian patients with Schistosoma-associated transitional cell carcinoma of the ***:The study included 50 patients with transitional cell carcinoma for whom radical cystectomy and urinary diversions were carried *** and p53 protein expressions were evaluated with an immunohistochemical staining method,and H-ras oncogene mutations were analyzed with a polymerase chain reaction-restriction fragment length polymorphism(PCR-RFLP) ***:High grade tumors revealed higher p53 immunostaining than low grade tumors(P = 0.016).p53 and VEGF protein expressions,as well as H-ras oncogene mutations,had an insignificant impact on patient outcomes(P = 0.962,P = 0.791,and P = 967,respectively).Cancer extension to regional lymph nodes was associated with poor outcomes(P = 0.008).CONCLUSION:VEGF,p53 and the H-ras oncogene have no relation to patient survival and outcome in Schistosoma-associated transitional cell carcinoma.

关键词： Bladder cancer Transitional cell carcinoma Vascular endothelial growth factor p53 H-ras oncogene

A growth model for a hyalid amphipod Hyale perieri in the coastal water of Alexandria(Egypt)

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Acta Oceanologica Sinica 2003年第2期22卷 221-232页

作者： zakaria H.Y Dowidar N.m. El-Komi m.m. Atta m.m. National Institute of Oceanography and Fisheries AlexandriaEgypt.Department of OceanographyFaculty of ScienceAlexandria UniversityEgyptNational Institute of Oceanography and FisheriesAlexandriaEgypt.Department of OceanographyFaculty of ScienceAlexandria UniversityEgypt

The growth rate of the hyalid amphipod Hyale perieri was studied on the bases of Ikeda'sgrowth model which is based on the inter moult period (IP) and moult increament (△BL). To apply this approach, laboratory experiments were carried out at three temperatures regimes (15℃, 20℃, 25℃ ) to gain accurate data of IP and BL. The total number of specimens used in this study was 86 at 15℃ , 24 at 20℃ and 70 at 25℃. The number of flagellar segments of both antennae of the Hyale perieri could not be used as an index of growth (instar criterion). The obtained results indicated that, the predicted IP of the specimens was inversely related to temperature and in good agreement with the observed values at the experimental temperatures. IP data obtained from laboratory-reared specimes are combined with ABL data to establish a growth model for Hyale perieri from its release from the mar-supium (1.64 mm BL ) to the maximum size (12.67 mm BL) as a function of temperature. The maximum numbers of consecutive moults recorded during the experiment were 13 moults (14 instar) at 15℃, 14 moults (15 instar) at 20℃ and 12 moults (13 instar) at 25℃ . The predicted life span for BL = 12.67 mm (moult 13) was 203.82 d at 15t, for BL = 11.75 mm (moult 14) was 138.94 d at 20℃ and for BL = 8.65 mm (moult 12) was 75.40 d at 25℃ respectively, thus confirming that the life span of the species is inversely proportional to temperature. Within the experimental temperatures tested, the optimum temperature for the growth of the species was 20℃.

关键词： growth model inter moult period and moult increament hyalid amphipod Hyale perieri coastal water of Alexandria

Spectral Element Discretization of the Stokes Equations in Deformed Axisymmetric Geometries

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Advances in Applied mathematics and mechanics 2011年第4期3卷 448-469页

作者： zakaria Belhachmi Andreas Karageorghis Laboratoire de mathematiques Informatique et ApplicationsEA CNRSUniversite de Haute AlsaceRue des Freres Lumieres68096 MulhouseFrance Department of mathematics and Statistics University of CyprusP.O.Box 205371678 NicosiaCyprus

In this paper,we study the numerical solution of the Stokes system in deformed axisymmetric *** the azimuthal direction the discretization is carried out by using truncated Fourier series,thus reducing the dimension of the *** resulting two-dimensional problems are discretized using the spectral element method which is based on the variational formulation in primitive *** meridian domain is subdivided into elements,in each of which the solution is approximated by truncated polynomial *** results of numerical experiments for several geometries are presented.

关键词： Spectral element method Stokes equations variational formulation deformed geometries Fourier expansion

Effects of human disturbance on liana community diversity and structure in a tropical rainforest, malaysia: implication for conservation

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Journal of Plant Ecology 2012年第4期5卷 391-399页

作者： Patrick Addo-Fordjour zakaria B.Rahmad A.m.S.Shahrul School of Biological Sciences Universiti Sains MalaysiaPenangMalaysia

Aim Due to the important role of lianas in the functioning of forest ecosystem,knowledge of the factors that affect them are important in the management of ***,there are conflicting reports on the response of liana communities to disturbance,calling for more research in the *** present study was carried out to investigate the response of liana diversity and structure to human disturbance within two major forests in the Penang National Park,*** study also looked at the implication of the findings for *** A total of 15 40×40-m^(2)(or 40-m×40-m)plots each were randomly located across a range of habitats in a primary forest and disturbed secondary *** with diameter at breast height≥10 cm were examined for lianas with diameter≥2 *** lianas and trees were enumerated and compared between the two *** and structural variables of lianas were compared between the two forests using the t-test *** abundance was also compared between the two forests with t-test,while linear regression analysis was run to determine the effects of tree abundance on liana *** Findings A total of 46 liana species belonging to 27 genera and 15 families were identified in the *** disturbance significantly reduced liana species richness and species diversity in the secondary *** abundance remained the same in both forests whereas liana basal area was;7 times higher in the primary *** and hook climbers were significantly more abundant in the primary and secondary forest,*** diameter lianas were more abundant in the primary forest compared with the secondary *** diameter distribution of most families in the primary forest followed the inverted J-shaped curve whereas only a few of the families in the secondary forest did *** abundance was significantly higher in the primary *** abundance of lianas significantly depended on tree abundance in all the f

关键词： climbing mechanism conservation liana diversity and structure human disturbance