432 research outputs found

    Effect of nitrogen application methods and harvesting dates on yield and yield components of some flax cultivars

    Get PDF
    Two field experiments were conducted during 2015/16 and 2016/17 seasons at Kafr El-Hamam Agricultural Research Station, Sharkia Governorate to study the effect of two methods of nitrogen application on yield and quality of three flax cultivars. In the 1st method, all N was applied prior to the first irrigation and in the 2nd method half N was applied prior to the first irrigation + ½ N dose prior to the second one. Application of 2nd method and delaying harvest from 135 to 150 up to 165 days after sowing (DAS) were associated with the highest values of yield and quality. Giza 10 variety ranked first and significantly surpassed the two other cultivars (Belnika and Sakha 5) in terms of straw yield. However, Sakha 5 outyielded significantly the two tested flax cultivars regarding seed yield. For highest values of yield and quality, we recommend planting Giza 10 and Sakha 5 flax cultivars with a split application of nitrogen and delaying harvest to up to 150 DAS. Key words: Flax, cultivars, splitting nitrogen, harvest dat

    The Effectiveness of the Problem-Solving Strategy in Enhancing the Academic Achievement of Islamic Studies Students at a Saudi College

    Get PDF
    Recently, there has been a shift from teacher- to student-centered teaching paradigms, which have proven to lead to better learning outcomes. However, teaching in the Islamic Studies Department at Ad-Dilam College of Education, Prince Sattam Bin Abdulaziz University, Saudi Arabia, is currently mainly lecture-oriented. This is attributable to the nature of Islamic courses, which conventionally focus on lecturing on the part of teachers and memorization on the part of students. This study has explored the effectiveness of a student-centered teaching strategy, the problem-solving strategy, in enhancing the academic achievement of Islamic Studies students at Ad-Dilam College of Education. One group of students (N = 22) was taught a unit in the Special Teaching Methods Course using the problem-solving strategy. Another group (N = 20) was taught the same unit using conventional lecture-oriented teaching. An author-developed achievement test was used to compare the performance of the two groups after the intervention. Means, standard deviations, and independent samples t-tests revealed that the problem-solving classroom significantly outperformed the lecture-oriented classroom in skills, values, and total achievement. Both groups achieved comparable gains in the knowledge dimension of achievement, thus the difference between the groups in knowledge was not significant. Classroom observation during the intervention revealed that students in the problem-solving classroom were more enthusiastic and interacted more actively during classes. Based on the findings, implications are drawn and recommendations offered

    The Prediction of the Electromagnetic Properties and the ?(E2/M1) of 110-116Cd-Isotopes in IBM Model

    Get PDF
    The Nuclear structure of 110-116Cd isotopes was studied theoretically in the framework of the interacting boson model of IBM-l and IBM-2. The properties of the lowest mixed symmetry states such as the 1+, 2+ and 3+ levels produced by the IBM-2 model in the vibrational-limit U(5) of Cd - isotopes are studied in details. This analysis shows that the character of mixed symmetry of 2+ is shared between and states in 110-114Cd – isotopes, the large shar goes to s, while in isotope, the state is declared as a mixed symmetry state without sharing. This identification is confirmed by the percentage of F-spin contribution. The electromagnetic properties of E2 and Ml operators were investigated and the results were analyzed. Various values of eB in the IBM-l and fixed e?= 0.104 eb and e?=0.093 e.b in the IBM-2 are used to generate the B(E2) and Q(2+). Fixed values of g? =0.31?N and g? =-0.31?N were adopted to generate the B(Ml) and ?(E2/ Ml) mixing ratios. The small values of ?(E2/Ml) which obtained for transition from MS- states to those of full symmetry support the conclusion that there may be a strong Ml transition between these states

    Upper Euphrates Dialects between Arab Tribes’ Vernaculars and the Influence of Semitic Languages

    Get PDF
    لقد بات الاهتمام بدراسة اللهجات من أولويات علم اللغة الحديث، لما يقدمه هذا المجال من إسهامات كبيرة في فهم طبيعة اللغة وتتبع مراحلها التاريخية وبيان مدى تأثير البيئة والزمن في أصواتها وصرفها وبناء الجملة فيها، وما يعكسه ذلك على المستوى الدلالي، فيسلط هذا البحث الضوء على اللهجات العربية في منطقة أعالي الفرات. التي كانت عرضة لتغيرات جيوسياسية فرضت عليها أن تكون محطة لكثير من الأمم متعددة الثقافات واللغات. أثرت وتأثرت بلغات وثقافات سكانها الأصليين، فكان من الضرورة البحث والاستقصاء حول تلك المتغيرات التي تلعب دوراً في الوقوف على تأريخ اللهجات وأصالتها السائدة في هذه المنطقة قيد الدراسة، فاستعرض البحث الطبيعة الجغرافية للمنطقة ودورها في اختلاف اللهجات من قبيلة إلى أخرى، وكذلك تم استعراض الأقوام الأجنبية التي استوطنتها وتركت رواسب لغوية على عربية هذا الجزء من الأرض بشكل مختصر، ومما لا شك فيه كان التأثير متبادلاً، كما يكشف البحث عن الكثير من الألفاظ والسمات اللغوية الأصلية في اللغة العربية حولتها محاولات سرعة إيصال الفكرة والتسهيل إلى تغيير في شكل اللفظ صوتياً وصرفياً، ومن الجدير بالذكر إن من تلك الأمم الساميين التي تشترك لغاتهم بالعربية بالكثير من السمات اللغوية الناشئة من وحدة المصدر، وهو ما ركز عليه البحث في أغلب جوانبه.The interest in the study of dialects has become a priority for modern linguistics, as this area makes significant contributions to understanding the nature of the language, tracking its historical stages, demonstrating the impact of the environment and time on its voices, its disbursement and syntax, and what this reflects at the semantic level. This research highlights Arab dialects in the Upper Euphrates region which were subject to geopolitical changes that forced them to be a station for many multicultural and multilingual nations influenced and are affected by the languages and cultures of its indigenous population. Therefore, it was necessary to research and investigate those variables that play a role in determining the history and authenticity of the dialects prevailing in this area under study. The research reviewed the geographical nature of the region and its role in different dialects from one tribe to another, as well as briefly reviewed the foreign communities that settled it and left linguistic deposits on the Arabic of this part of the land and undoubtedly had a mutual impact. The research also reveals many of the original language and features in Arabic that have been transformed by attempts to quickly communicate the idea and facilitate a change in the form of the word vocally and purely, and it is worth noting that some of these nations are Sami, whose languages share in Arabic many of the language features arising from the source unit, which the research has focused on in most aspects. &nbsp

    Screening of Aflatoxin Production by Aspergillus flavus Isolates from Petroleum-contaminated Soil

    Get PDF
    Fungi are eukaryotic, heterogeneous, unicellular to filamentous, spore-bearing, and chemoorganotrophic organisms which lack chlorophyll. This present study was carried out to isolate and identify fungi from petroleum-contaminated soil. Several fungal genera which included Rhizopus spp., Mucor spp., Penicillium spp., Rhizoctonia spp., Aspergillus spp., Alternaria spp., and Cladosporiumspp. were isolated using potatoes dextrose agar, Czapek-Dox Agar, and Aspergillus flavus Differentiation Agar culture media that comparable with co-amoxiclav (1g) and chloramphenicol to prevent the growth of any bacteria. The direct plate and serial dilution agar plate methods were used for the isolation of fungi. Based on results, Aspergillusand Mucor spp. were the most predominant genera and had the highest number of colonies in the soil samples. In this investigation, seven out of 27 soil samples were morphologically (macroscopically and microscopically) identified, such as A. flavus. Aflatoxigenicity of A. flavus was detected using characteristics in Aspergillus differentiation agar and colony fluorescence on exposure to ultraviolet light. Moreover, molecular approaches were used for the detection of aflatoxigenic of the A. flavus isolates. Three structural (aflD, aflO, and aflP) and one regulatory (aflR) gene of the aflatoxin gene cluster of A. flavus were targeted for amplification by the polymerase chain reaction method. The aflatoxigenic of all six A. flavus isolates was detected molecularly which contained two structural (aflD, aflP)genes out of three structural genes, while there was no specific amplification of the aflO gene in the fourth, fifth, and sixth A. flavus which issimilar to the aflR gene in the first and second A. flavus
    corecore