526 research outputs found

    Interlaced Influence of Various Water Quantities and Mite Densities on Broccoli (Brassica Oleracea.) Production

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    This study was carried out at Faculty of Agricultural- Suez Canal University which located in north eastern Egypt, within the Governorate of Ismailia. The experiment was conducted to assess the influence of different amounts of water and mite densities (phytophagous & predaceous ) on Broccoli production. Thus; the factor of water amounts comprise into three treatments (Q1, Q2 and control ) with average (977.63, 1955.28 and 2371.5 m3/fed.) respectively during period December  2014 to April 2015. The results revealed that The water quantities have a significant influence on Phytophagous and Predacieous mites  where the highest mean value for mites density was observed with ( Q2 ) by (10.5N/in2) and (8.16 N/in2) for Phytophagous and Predacieous mites respectively. On the other hand; the density of Phytophagous mite by ( 1 n/in2) need approximately 167.12, 134.18 and 154.82 heat units under treatment Q1, Q2 and C respectively.  However; Predacieous mite density (1n/in2) needs for 269.38 heat units under Q1 and 172.23 heat units under both Q2 and C treatments. Furthermore; the value of yield under treatment Q2 was the highest value (9.017 ton / fed) comparing with others treatment’s values (7.91 & 5.04 ton/fed) for (Q1 and Control respectively). However; with treatment Q1 recorded a highest Irrigation water use efficiency ( IWUE ) by (7.96 Kg/m3) after obtaining Heat use efficiency (HUE) 5.5 heat unit. Thus; from previous data analysis that best treatment is Q1 (low amount of water) which gain a good value both (IWUE) and (HUE). Keywords:  water quantities; mite densities; Irrigation water use efficiency and broccoli production

    Mathematical Model for Maximizing Irrigation Water Benefits

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    Predicting impact of alternative management for enhancing the influence of soil parameters and water management on crop production is concerning in scientific community. This paper emphasis on the soil moisture behaviour at different profiles and their relation with soil temperature and dripper's discharge using a two boxes with diminution (1m X 1m X 1m) for cultivate  Fenugreek (Trigonella foenum-graecum L.,Fam. Fabaceae) under sandy soil texture with test a two factors. First factor is the timing of irrigation (IRR1) at the morning and (IRR2) at the evening . Second factor is adding compost (C1) (6 ton/fed) and (C2) without compost. Experiment found out that the yield recorded highest production under C1 by 847% comparing with C2 without significant influence for the timing of irrigation. Moreover; using Robust Methods to determent the mathematical relationship with different parameter [soil temperature(C°) for different depths and water quantity (L/day) ] to estimate the ratio of soil moisture. Furthermore; using (matrix) Cramer’s method to predict any of these parameters by know one parameter. Keywords: soil temperature, soil moisture, timing of irrigation and mathematic relationship

    Wheat Production under Western North Coast Conditions Using A Simulation Model

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    This study was carried out at Marsa Matruh governorate - western north coast Egypt (31° 15´ 35ʺ N, 27° 9´ 43ʺ E) in the 2014/2015 growing season. The experiment was conducted to assess and validate the AquaCrop model under various factors [sowing dates, tillage operation and different Supplementary irrigation strategies] on biomass and grain yield production for winter wheat. Thus; the factor of sowing date comprise into three treatments (1st Nov, 15th Nov and 30th Nov). Second factor is tillage with two treatments (no tillage and tillage 20cm) and the third factor is Supplementary irrigation with three treatments (0, 75 and 112.5mm). The AquaCrop model adequately simulated the biomass yield (BY), and grain yield (GY) for winter wheat under different treatments. The simulated (BY) agreed well with the measured (BY) across different treatments where (R2= 0.82 & E = 0.82 & RMSE = 6.7%) for winter wheat under different treatments of (sowing dates and supplementary irrigation strategies) with tillage process. measured and simulated (GY) were also closely related. The AquaCrop model calibrated the GY with the prediction statistics error by (R2= 0.69 & E = 0.7 & RMSE = 2.8%) with tillage process. Moreover; the (1 Ton.Fed-1) for (BY)  needs for (635.9, 588.3 and 510.6) heat units (AGDD) as an average under different sowing dates ( 1st Nov, 15th Nov and 30th Nov.) respectively. Further; the (1 Ton.Fed-1) from grain yield needs for (1779.05) heat units if sowing on the (1st Nov.), for (1641.85) heat units on (15th Nov.) and for (1468.7) heat units on (30th Nov.). Notable; that the highest value for heat uses efficiency (HUE)  observed with (112.5mm) and tillage operation under sowing date 30th Nov by (2.2 & 0.72 Kg. fed -1 C-1day-1) for both (BY) and (GY) respectively. Consequently; these results suggest that the AquaCrop model could be used to predict BY and GY of winter wheat with a high degree of reliability at western north coast conditions. Keywords:  AquaCrop model; sowing date; Tillage; Supplementary irrigation and winter wheat production

    Statcom integration in a power grid to enhance voltage stability

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    To solve load growth of an existing electrical system, we at first inject the power in system by building new electrical plants as wind, solar or thermal. And secondly in year 2030, when the system is so meshed, some customers are far away at production stations. We propose the installation of FACTS devices to enhance voltage in stability margins of power system under study. The power flow analysis using Newton Raphson method was running on Matlab and PSS/E Simulator. The results of simulation without STATCOM show the most affected buses. To improve the voltage for all these buses, reduce the power mismatches and tranmit more ative power, we insert STATCOM. STATCOM is a shunt connected FACTS application which facilitate the fast voltage control, the reactive power control and reduce the harmonics in a power system

    Centre-level variation in speech outcome and interventions, and factors associated with poor speech outcomes in 5-year-old children with non-syndromic unilateral cleft lip and palate:the Cleft Care UK study. Part 4

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    Objectives: To investigate centre-level variation in speech intervention and outcome and factors associated with a speech disorder in children in Cleft Care UK (CCUK). Setting and Sample Population: Two hundred and sixty-eight 5-year-old British children with non-syndromic unilateral cleft lip and palate recruited to CCUK. Materials and Methods: Centre-based therapists undertook audio-video recordings. Perceptual analysis was undertaken using the CAPS-A tool. Speech outcomes were based on structural and articulation scores, and intelligibility/distinctiveness. Between-centre variation in treatment and outcomes were examined using multilevel models. These models were extended to estimate the association between a range of factors (hearing loss, speech intervention, fistula, secondary speech surgery for velopharyngeal insufficiency, socio-economic status, gender, and parental happiness with speech) and speech outcomes. Results: There was centre-level variation in secondary speech surgery, speech intervention, structure and intelligibility outcomes. Children with a history of speech intervention had a lower odds of poor intelligibility/distinctiveness, 0.1 (95% CI: 0.0-0.4). Parental concern was associated with a higher odds of poor intelligibility/distinctiveness, 13.2 (95% CI: 4.9-35.1). Poor speech outcomes were associated with a fistula, secondary speech surgery and history of hearing loss. Conclusions: Within the centralized service there is centre-level variation in secondary speech surgery, intervention and speech outcomes. These findings support the importance of early management of fistulae, effective management of velopharyngeal insufficiency and hearing impairment, and most importantly speech intervention in the preschool years. Parental concern about speech is a good indicator of speech status

    Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

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    A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

    Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

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    Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02

    Search for a W' boson decaying to a bottom quark and a top quark in pp collisions at sqrt(s) = 7 TeV

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    Results are presented from a search for a W' boson using a dataset corresponding to 5.0 inverse femtobarns of integrated luminosity collected during 2011 by the CMS experiment at the LHC in pp collisions at sqrt(s)=7 TeV. The W' boson is modeled as a heavy W boson, but different scenarios for the couplings to fermions are considered, involving both left-handed and right-handed chiral projections of the fermions, as well as an arbitrary mixture of the two. The search is performed in the decay channel W' to t b, leading to a final state signature with a single lepton (e, mu), missing transverse energy, and jets, at least one of which is tagged as a b-jet. A W' boson that couples to fermions with the same coupling constant as the W, but to the right-handed rather than left-handed chiral projections, is excluded for masses below 1.85 TeV at the 95% confidence level. For the first time using LHC data, constraints on the W' gauge coupling for a set of left- and right-handed coupling combinations have been placed. These results represent a significant improvement over previously published limits.Comment: Submitted to Physics Letters B. Replaced with version publishe

    Search for the standard model Higgs boson decaying into two photons in pp collisions at sqrt(s)=7 TeV

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    A search for a Higgs boson decaying into two photons is described. The analysis is performed using a dataset recorded by the CMS experiment at the LHC from pp collisions at a centre-of-mass energy of 7 TeV, which corresponds to an integrated luminosity of 4.8 inverse femtobarns. Limits are set on the cross section of the standard model Higgs boson decaying to two photons. The expected exclusion limit at 95% confidence level is between 1.4 and 2.4 times the standard model cross section in the mass range between 110 and 150 GeV. The analysis of the data excludes, at 95% confidence level, the standard model Higgs boson decaying into two photons in the mass range 128 to 132 GeV. The largest excess of events above the expected standard model background is observed for a Higgs boson mass hypothesis of 124 GeV with a local significance of 3.1 sigma. The global significance of observing an excess with a local significance greater than 3.1 sigma anywhere in the search range 110-150 GeV is estimated to be 1.8 sigma. More data are required to ascertain the origin of this excess.Comment: Submitted to Physics Letters

    Measurement of the Lambda(b) cross section and the anti-Lambda(b) to Lambda(b) ratio with Lambda(b) to J/Psi Lambda decays in pp collisions at sqrt(s) = 7 TeV

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    The Lambda(b) differential production cross section and the cross section ratio anti-Lambda(b)/Lambda(b) are measured as functions of transverse momentum pt(Lambda(b)) and rapidity abs(y(Lambda(b))) in pp collisions at sqrt(s) = 7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Lambda(b) decays reconstructed in the exclusive final state J/Psi Lambda, with the subsequent decays J/Psi to an opposite-sign muon pair and Lambda to proton pion, using a data sample corresponding to an integrated luminosity of 1.9 inverse femtobarns. The product of the cross section times the branching ratio for Lambda(b) to J/Psi Lambda versus pt(Lambda(b)) falls faster than that of b mesons. The measured value of the cross section times the branching ratio for pt(Lambda(b)) > 10 GeV and abs(y(Lambda(b))) < 2.0 is 1.06 +/- 0.06 +/- 0.12 nb, and the integrated cross section ratio for anti-Lambda(b)/Lambda(b) is 1.02 +/- 0.07 +/- 0.09, where the uncertainties are statistical and systematic, respectively.Comment: Submitted to Physics Letters
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