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Search Results: 1 - 10 of 461337 matches for " A.A. Khooharo "
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A Linear Regression Model to Study the Relationship of Pesticide Imports with Agricultural Productivity Growth in Pakistan
A.A. Khooharo,R.A. Memon,M.U. Mallah
Journal of Applied Sciences , 2006,
Abstract: The purpose of this study was to examine the import of pesticides in Pakistan since February 1980, when import and sale of pesticide was shifted to private sector and subsidy on ground spraying was withdrawn. Various pesticide registration schemes of import have been discussed and number of pesticides registered in each scheme has been reported. The pros and cons of registration schemes have been discussed. An appropriate regression model satisfying basic assumptions has been developed for the import and consumption of pesticides. Using the model estimates, it was concluded that the growth rate of pesticide import was computed to be 35% in 1981 taking 1980 as base year, 30% in 1982 taking 1981 as base year; and for subsequent years, the growth rate of pesticide import has lowered and has reached at 8% in 1999 taking corresponding preceding year as base year. The same growth rate has been calculated till 2002. The agricultural growth rate has been recorded lower than that of pesticide import excepting 1995-96, when highest agricultural growth rate of the decade was recorded to be 11.7% and with pesticide import growth rate of 10%. This indicates that the trend of using pesticide for pest control is higher when compared to agricultural growth trend.
An Assessment of Regulatory Framework for Monitoring of Pesticides in Sindh Province of Pakistan
A.A. Khooharo,R.A. Memon,M.Y. Memon,M.U. Mallah
Journal of Applied Sciences , 2006,
Abstract: Numerous companies have entered the pesticide market in Pakistan due to windfall profits and liberal policies of the government since 1980s, when new agriculture policy was announced and the import and sale of pesticides were shifted to private sector. Easy imports, low prices and availability of a variety of pesticides are the distinct advantages of liberal policies. On the other hand, sale of substandard pesticides is a common problem of farming community due to regulatory and institutional deficiencies. This study was conducted to evaluate and to redesign regulatory framework for monitoring of pesticides by Agriculture Extension in view of stakeholders` perceptions during 2003-04. Finding of the study revealed that during three years (2000-2002) 2190 samples were tested in provincial laboratories of Sindh and 268 (12%) were declared substandard. Out of 268, 150 FIRs (56%) were lodged and 86 (32%) cases were challenged in courts while only 47 (18%) cases were decided by the courts. Majority of the stakeholders including District Officers Agriculture (100%) and Sales Executives(63%) were not satisfied with the present monitoring system for pesticides. All the Pesticide Dealers interviewed were of the opinion that pesticide companies be named in FIR when samples are declared unfit by the laboratories, because they purchase sealed pesticides from pesticide companies.
Comparative Study of Selected Factors Enhancing Farmers Knowledge of Identifying Insect Pests and Diseases in Cotton
A.A. Khooharo,I.P. Bhatti,V. Suthar,A.B. Chhutto
Journal of Applied Sciences , 2001,
Abstract: This study has attempted to determine the farmers’ knowledge of identifying insect pests and diseases, as well as perceived contribution of different sources of information enhancing farmers’ knowledge. Two-stage cluster sampling was applied to select 150 cotton growers of district Hyderabad, Sindh, Pakistan in 1999-2000. It was concluded that the farmers’ average score of identifying insect pests in cotton was 46.0% and diseases in cotton was 22.5%. The most important finding of the study was that pesticide Agents’ performance was better than Agricultural Extension Agents performance regarding letting the farmers’ solve insect and disease problem in cotton. Besides, the sources that significantly contributed to enhancing farmers’ knowledge regarding identifying: (1) Insect Pests were Farmers’ Age, help from Pesticide Agents, Discussing with other Farmers’, Watching Agri. Programs on T.V, and Reading Agri. Literature; and (2) Disease were Farmers’ Age, Help from Pesticide Agents and Watching Agri. Programs on T.V. This study will help extension services improve contact system with farmers’ through the use of different sources of information such as T.V, literature and personal visits as these sources were found to have significant impact on farmers’’ knowledge.
Effects of Steel Fibers and Iron Filings on Thermal and Mechanical Properties of Concrete for Energy Storage Application  [PDF]
A.A. Adeyanju, K. Manohar
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.1015111
Abstract: An experimental study on the thermal properties of iron filings and steel-fiber-reinforced concrete for solar/thermal energy storage application is presented in this report. It takes into account the results of measurements of thermal conductivity, thermal resistivity, thermal diffusivity and the results of compressive strength, density as well as energy storage capacity calculated from the knowledge of the above measured parameters. The experimental testing method is described as well: based upon the linear heat source theory, it requires the use of a special probe to be inserted into the sample. The experimentation was forwarded to test concrete aggregate mixtures with three different sizes and same quantity of steel fibers; two different quantities of iron filings and one plain concrete. The measurements were carried out from the pouring time of cubic samples and were ended up when hardened conditions were achieved. The results indicate that the steel fibers and iron filings have influence on the thermal and mechanical properties of the concretes tested, thus the iron filings and steel fibers reinforced concrete is suitable for better solar/thermal energy storage due to an increase in storage capacity over plain concrete.
Utiliza??o prática da análise de crescimento vegetal
Lucchesi, A.A.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1984, DOI: 10.1590/S0071-12761984000100011
Abstract: the objective of this work is to determlne elements for utilization of quantitative analysis on plant growth, which is a valuable complement of experimental analysis in crop science, mainly plant productivity research.
Around voltammetry: from colouring matters to beer
Portugaliae Electrochimica Acta , 2006,
Abstract: this paper is based on the plenary lecture that i was invited to present in the viii encontro ibérico de electroquímica and xiii encontro da sociedade portuguesa de electroquímica, a meeting which was "a tribute to the late prof. jo?o cabral".the best way i found to honour his memory was to present the highlights of an investigation of 25 years in voltammetry, which would never happen without the enthusiasm and the guidance of prof. jo?o cabral. after a first publication, in 1986, on the adsorptive stripping voltammetry of synthetic colouring matters, our investigation was soon directed towards the new analytical possibilities opened by the appearance of new voltammetric instrumentation capable of very fast potential scans. the instrumental elimination of oxygen interference obtained in the fast adsorptive stripping of some species reversibly reducible on the hanging mercury drop electrode (hmde) was a first achievement, immediately followed by the development of a hmde flow detector for the determination of those species. this detector is being applied in the flow determination of several compounds, with the determination of diacetyl deserving a special reference. in fact the determination of this compound it is very important for the brewing industry and it was possible to develop an equipment capable of its determination in flow: diacetyl is extracted from beer by pervaporation, then derivatized with orto-phenytlenediamine and finally determined by hmde adsorptive stripping voltammetry.
Effect of Non-aqueous Solvents on the Rate of Production of Copper Powder from Copper Sulphate Solution by Cementation on Stationary Zinc Sheet and Rotating Zinc Cylinder
Portugaliae Electrochimica Acta , 2004,
Abstract: the rate of copper ii/zinc cementation from copper sulphate solutions in the absence and in the presence of methanol (ch3oh) and dimethyl sulphoxide (dmso) has been studied and the reaction was found to follow first-order kinetics. the influence of several parameters on the course of the reaction, such as cylinder rotation speed, initial concentration of cu2+ ions, temperature and concentration of organic solvent, was investigated. in the case of ch3oh, rotating zinc cylinder was used, while in the presence of dmso stationary zinc sheet and rotating zinc cylinder were used. it was found that (1) the percentage inhibition caused by methanol ranged from 10.70 to 58.38 depending on the concentration of the alcohol used; (2) the rate of cementation in the presence of dmso using rotating zinc cylinder > the rate of cementation in the presence of dmso using stationary zinc sheet; (3) the rate of cementation on zinc cylinder in the presence of dmso < the rate of cementation in the presence of ch3oh. different reaction conditions, and the physical properties of solutions are studied to obtain dimensionless correlation among all these parameters. thermodynamic parameters δs*, δh* and δg* were studied.
Medicina Baseada em Evidências: a arte de aplicar o conhecimento científico na prática clínica
Lopes, A.A.;
Revista da Associa??o Médica Brasileira , 2000, DOI: 10.1590/S0104-42302000000300015
Abstract: this article was written with the objective of describing the concept of evidence based medicine (ebm) and the competences required for its practice. ebm should be viewed as an integration of clinical experience with the ability to analyze and rationally apply the scientific information while taking care of patients. the application of methods and strategies to enhance the scientific background of the physician while taking into account the humanitarian values of the medical profession should contribute to improve the quality of the medical care that is offered in brazil. the medical schools and associations may play important roles in the promotion of ebm.
Seed improvement by selection and invigoration
Powell, A.A.;
Scientia Agricola , 1998, DOI: 10.1590/S0103-90161998000500023
Abstract: the basis of differences in seed quality are described for two groups of crops, grain legumes and vegetables and approaches to the improvement of quality are proposed. in grain legumes the major factors affecting seed quality are imbibition damage, seed ageing and their interaction. it is proposed that use of seed vigour tests, specifically the electrical conductivity test, to identify the incidence of imbibition damage and ageing allows the selection of seed lots for sale and for use under different field conditions. alternatively in grain legume species in which there is a genotypic influence on predisposition to imbibition damage the approach to seed improvement may lie through selection in breeding programmes. thus identification of testa characteristics that favour slow imbibition would enable selection for these characteristics. seed ageing is also the major cause of reduced seed quality in vegetable species, leading to slow and asynchronous germination. an approach to their seed improvement has been the development of seed invigoration treatments based on seed hydration. the principle of these treatments is described and several treatments outlined, with emphasis being given to aerated hydration, a treatment completed within 36h. the physiological basis of improvement by invigoration is discussed.
African Journal of Urology , 2001,
Abstract: Objectives To determine the morbidity and patient tolerance of TRUS-guided biopsy from suspected malignant prostate or pelvic recurrence after radical cystectomy. Patients and Methods This prospective study comprised 113 patients who underwent TRUS-guided biopsy from the prostate or from pelvic recurrence following radical cystectomy. The patients' tolerance was assessed by scoring the severity of discomfort during the procedure and their acceptance was estimated by questionnaires following it. Results Most patients (56.6%) experienced either no discomfort at all or only mild pain during the procedure. Intravenous sedation was needed in 31% of the patients and general anaesthesia was necessary in two patients. Haematuria was the commonest complication (59.6%) followed by rectal bleeding and haemospermia, which occurred in 36.7% and 17.4% of the patients, respectively. A vasovagal attack occurred in one patient. There was one major complication, a prostatic abscess which resulted in a temporary urethro-rectal fistula. Conclusion TRUS-guided core biopsy is safe with frequent minor but` very rare major complications. The majority of the patients tolerate the procedure with accepted discomfort but a considerable number of patients need sedation to complete the procedure effectively. African Journal of Urology Vol. 7 No. 2 (May 2001): pp 57-61 Biopsie Transrectale Echoguidée: Etude Prospective de la Tolérance des Patients et des Complications Objectif Evaluer la tolérance et l'acceptance des patients de la biopsie transrectale échoguidée. Patients et Méthodes Cette étude prospective comprenait 113 patients qui ont bénéficié d'une biopsie transrectale échoguidée de la prostate ou d'une récurrence pelvienne après cystectomie radicale. La tolérance des patients était évaluée en cotant la sévérité du disconfort pendant la procé-dure et leur acceptance était estimée par des questionnaires ensuite. Résultats La plupart des patients (56,6%) ne ressentaient pas du tout de disconfort ou ressentaient seulement une douleur mineure pendant la procédure. Une sédation intraveineuse a été nécessaire chez 31% des patients et une anesthésie générale a été nécessaire dans 2 cas. L'hématurie était la complication la plus fré-quente, suivie de rectorragies et d'hématospermie survenues chez 36,7% et 17,4% des patients, respectivement. Une attaque vaso-vagale est survenue chez un patient. Il y avait une complication majeure: un abcès prostatique ayant évolué à une fistule uréthro-rectale temporaire. Conclusion La biopsie transrectale échoguidée est anodine, ses complications mineures sont fréquentes mais les complications majeures sont très rares. La majorité des patients tolèrent la procédure avec disconfort accepté mais un nombre considérable de patients nécessitent une sédation pour compléter efficace-ment la procédure. African Journal of Urology Vol. 7 No. 2 (May 2001): pp 57-61
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