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Primary Production Dynamics of Two Dominant Macrophytes in Wular Lake, a Ramsar Site in Kashmir Himalaya
Naseer Ahmad Dar,Aadil Hamid,Bashir Ahmad Ganai,Sami Ullah Bhat
Ecologia Balkanica , 2012,
Abstract: Growing season changes in the organic matter, organic carbon and chlorophyll content of the two dominant macrophytes, Nymphoides peltatum and Ceratophyllum demersum of Wular Lake, a Ramsar Site in Kashmir Himalaya were analysed during March- November 2011. The content of organic matter and organic carbon for Nymphoides peltatum were 114.1 g m-2 and 53.1 g C m-2 and Ceratophyllum demersum were 57.0 g m-2 and 26.4 g C m-2. Chlorophyll A (Chl a) and chlorophyll A+B (Chl a+b) pigments ranged from 1.75 mg g-1 (Chl a) and 2.1mg g-1 (Chl a+b) in Nymphoides peltatum to 4.41 mg g-1 (Chl a) and 5.69 mg g-1 (Chl a+b) in Ceratophyllum demersum. In full leaf out, the latter aquatic plants exceeded 15-20% coverage of the open water surface.Ceratophyllum demersum and Nymphoides peltatum achieved maximum growth in June and August respectively, but significant differences in their growth dynamics was observed. At the end of the vegetation period, these plants sink to the bottom and decompose.
Effect of nitrogen on achene protein, oil, fatty acid profile, and yield of sunflower hybrids Efecto de nitrógeno en la proteína, aceite, y perfil de ácidos grasos del aquenio y rendimiento de híbridos de girasol
Amjed Ali,Sami Ullah
Chilean Journal of Agricultural Research , 2012,
Abstract: Seed yield and achene oil yield are the main determinants for N application rates rather than seed composition. Nitrogen plays a critical role in producing unsaturated fatty acids (oleic and linoleic acids), which are the main factors determining sunflower oil quality (Helianthus annuus L.). Studies were conducted on the effect of N fertilization on seed yield, achene oil yield, and quality parameters of sunflower hybrids for two successive years (2010 and 2011) in a split plot arrangement under a randomized complete block design. The hybrids (Hysun-33 & S-278) and N levels (0, 75, 150, and 225 kg ha-1) were allotted in main and sub-plots, respectively. Increasing N levels resulted in steady increases in yield, protein contents and linoleic acid, whereas oil contents and percentage of oleic acid responded negatively during both years. At the same time, crop oil yield was positively related to increased N supply with higher achene yield (AY). Palmitic acid varied from 5.27 to 6.42 % and stearic acid ranged from 2.27 to 2.95%. Hybrid S-278 exhibited significantly (P < 0.05) higher AY (3380 kg ha-1), oil content (42.11%) than Hysun-33 (2968 kg ha-1 and 40.75%, respectively), while the opposite was true for protein content. Oil yield varied in response to N fertilizer, with a range of 34 to 37% providing the best quality traits in both seasons. Parece racional que el rendimiento de semilla y rendimiento de aceite de aquenio sigan siendo el foco determinante para tasas de aplicación de N en lugar de la composición de la semilla. El N parece jugar un papel imprescindible en la proporción de ácidos grasos insaturados (ácidos oleico y linoleico), factor principal que determina el aceite de girasol (Helianthus annuus L.). Los estudios fueron realizados para evaluar el efecto de la fertilización N en el rendimiento de semilla, rendimiento de aceite de aquenio, y parámetros de calidad de híbridos de girasol por 2 anos sucesivos (2010 y 2011) en un diseno de bloques completos al azar con arreglo de parcelas divididas. Los híbridos (Hysun-33 y S-278) y niveles de N (0, 75, 150 y 225 kg ha-1) fueron asignados a parcelas principales y sub parcelas, respectivamente. Niveles crecientes de N aumentaron de manera estable el rendimiento, contenidos de proteína y de ácido linoleico en el aceite, donde contenidos de aceite y porcentaje de ácido oleico respondieron negativamente durante ambos anos. Al mismo tiempo, el rendimiento de aceite del cultivo permaneció positivamente relacionado al gran suministro de N dando la ventaja de mayor rendimiento de aquenio (AY). El ácido p
The trend of hospital accreditation in Saudi Arabia
Ahmad Z. Qureshi,Sami Ullah,Rubina Ullah
Saudi Medical Journal , 2012,
Abstract: [No abstract available]
Management and Employee Perspective on Diversity: A Review Essay
Muhammad Ali Gondal,Sami Ullah
Journal of Asian Scientific Research , 2011,
Abstract: The interest of employers about the issue of managing workforce diversity has grownrapidly. A number of articles and books have been written on this issue in almost allparts of the world but yet the findings of the researches are fragmented with respect todefinition and ways to manage diversity. This review article on workforce diversity isarranged with respect to definition of diversity, managerial and employee perspectiveon diversity, diversity training programs, and the causes of failure of diversity trainingprograms. Articles and books covering these aspects of diversity are reviewed in thisregard. It is found that disparity in the managerial and employees perspective about thediversity is the main factor behind the failure of diversity training conducted indifferent parts of the world. Further it was found that the successful achievement of theobjectives of diversity training programs, employers should incorporate the opinion ofemployee representatives.
Effect of Inorganic Fillers on Thermal Performance and Char Morphology of Intumescent Fire Retardant Coating
W. Farhana Mohamad,Faiz Ahmad,Sami Ullah
Asian Journal of Scientific Research , 2013,
Abstract: An intumescent fire retardant coating is a substance when exposed to fire, it expands many time of its thickness forming as insulating layer of char which is strong enough to protect steel structure from fire and retain the structural integrity. Intumescent fire retardant coating has been developed by using Ammonium Polyphosphate (APP), Expandable Graphite (EG), Melamine (MEL), Boric Acid, Bisphenol A (BPA) and polyamide amine as a curing agent. Thus, local inorganic fillers which are alumina (Al2O3), aluminum trihydrate-ATH (Al (OH)3) and fumed silica added in the fire retardant materials. The main objective of this paper is to investigate the effect of local inorganic fillers on residual weight and char morphology of intumescent fire retardant coating. Intumescent fire retardant coating with addition of alumina fillers show greater residual weight and better char morphology.
To Study the Effect of Aluminium Trihydrate and Fumed Silica on Intumescent Fire Retardant Coating
Faiz Ahmad,Sami Ullah,Muhammad Syahmi Hamizol
Journal of Applied Sciences , 2012,
Abstract: Intumescent fire retarding coatings are designed to insulate the substrate under the action of fire. In this research to study the effect of Aluminium Trihydrate (ATH) and Fumed Silica (FS) on Expandable Graphite (EG) Intumescent Fire Retardant Coating (IFRC). The IFRC was based on EG, Ammonium Poly Phosphate (APP) as a acid source, melamine (MEL) as a blowing agent, Boric Acid (BA) as additive, ATH, FS as inorganic fillers and bisphenol. A epoxy resin BE-188 (BPA) was used as a binder with Hardener H-2310 polyamide amine. A range of different formulations were developed to study the char expansion, morphology of char and thermal properties of the IFRC. The formation of the final charring layer and their morphological structures was studied by Scanning Electron Microscopy (SEM). Char composition was determined by X-Ray Diffraction (XRD) technique. Thermogravimetric Analysis (TGA) was used to study the thermal stability of coating. Shear test was used to determine the bonding strength. IFRC with ATH give a better performance than fumed silica with 4 wt.% of ATH gives the best performance than others formulation in term of char expansion heat shielding, char residual weight and boding strength.
Phenyl N-cyclohexylcarbamate
Durre Shahwar,M. Nawaz Tahir,Naeem Ahmad,Sami Ullah
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536809050806
Abstract: In the title compound, C13H17NO2, the dihedral angle between the benzene ring and the basal plane of the cyclohexyl ring is 49.55 (8)°. In the crystal, molecules are linked by N—H...O hydrogen bonds, forming chains propagating in [010].
Effects of Exports Instability on Economic Growth in SAARC Region Countries
Farhat Rashid,Sami Ullah,Bedi-uz-Zaman
Pakistan Journal of Commerce and Social Sciences , 2012,
Abstract: This study analyzed the hypothesis that export instability affects the economic growth for SAARC region countries (Pakistan, India, Sri-Lanka and Nepal) by using neoclassical aggregate production with export and export instability as the additional variables. TheAugmented Dickey Fuller (ADF) and Johansson Cointegration tests are used to test stationarity for all variables and cointegration respectively. The results of these tests demonstrate that all variables are non-stationary at levels but stationary at their firstdifference and co integrated of order I(1). Export instability has deleterious effects for these four countries on economic growth and its magnitude is higher for Sri Lanka economy. The exports and investment has positive and significant effects on economicgrowth for all countries except the Nepalese economy where export has negative but insignificant effect on its economic growth. The most important policy implications for these countries are that they should diversify their exports horizontally and liberalize their foreign exchange markets and capital accounts to control the instability in exports.
Effect of Grazing Systems on Range Condition in Pabbi Hills Reserve Forest, Kharian, Punjab, Pakistan
Sajjad Haider,Muhammad; Maclaurin,Angus; Ali Chaudhry,Amjad; Mushtaque,Muhammad; Ullah,Sami;
Chilean journal of agricultural research , 2011, DOI: 10.4067/S0718-58392011000400010
Abstract: grazing management of rangeland systems has not been well researched in pakistan; grazing system the most sustainable is not known. in order to evaluate various grazing systems, a study was performed at pabbi hills reserve forest, kharian, punjab. four simulated grazing treatments, viz. ungrazed control, continuous grazing, seasonal deferred grazing, and rotational deferred grazing, were tested in a randomized complete block design with four replicates. response variables included species composition, fresh herbage yield, dry herbage yield of grasses and forbs, basal cover, and ground cover. of the three grazing systems, the six-month seasonal deferred grazing system resulted in a marked increase in basal cover, but had no changes in relative species composition. a significant increase in grass cover and herbage production were also observed in this grazing system, suggesting that the 6-mo seasonal deferred grazing system is the most sustainable rangeland system.
3-Ammonio-4-hydroxybenzoate monohydrate
Sami Ullah,M. Nawaz Tahir,Durre Shahwar,Zaheer-ud-Din Khan
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809017462
Abstract: The title compound, C7H7NO3·H2O, which crystallized as a hydrate, was obtained from an extraction of the plant species Saussurea atkinsonii of the asteraceae family collected from the hilly area (Ayubia) of Pakistan during the flowering season. The dihedral angle between the benzene ring and the carboxylate group is 25.64 (5)°. In the crystal, the packing is consolidated by N—H...O and O—H...O hydrogen bonds, as well as weak aromatic π–π stacking [centroid–centroid separation = 3.9365 (9) ] and C=O...π interactions.
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